2 * Copyright (C) 2008 Nokia Corporation. All rights reserved.
3 * Contact: Stefan Kost <stefan.kost@nokia.com>
4 * Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
5 * Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
6 * Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
25 * SECTION:gstbaseparse
26 * @title: GstBaseParse
27 * @short_description: Base class for stream parsers
28 * @see_also: #GstBaseTransform
30 * This base class is for parser elements that process data and splits it
31 * into separate audio/video/whatever frames.
35 * * provides one sink pad and one source pad
36 * * handles state changes
37 * * can operate in pull mode or push mode
38 * * handles seeking in both modes
39 * * handles events (SEGMENT/EOS/FLUSH)
40 * * handles queries (POSITION/DURATION/SEEKING/FORMAT/CONVERT)
43 * The purpose of this base class is to provide the basic functionality of
44 * a parser and share a lot of rather complex code.
46 * # Description of the parsing mechanism:
50 * * #GstBaseParse calls @start to inform subclass that data processing is
53 * * #GstBaseParse class calls @set_sink_caps to inform the subclass about
54 * incoming sinkpad caps. Subclass could already set the srcpad caps
55 * accordingly, but this might be delayed until calling
56 * gst_base_parse_finish_frame() with a non-queued frame.
58 * * At least at this point subclass needs to tell the #GstBaseParse class
59 * how big data chunks it wants to receive (min_frame_size). It can do
60 * this with gst_base_parse_set_min_frame_size().
62 * * #GstBaseParse class sets up appropriate data passing mode (pull/push)
63 * and starts to process the data.
67 * * #GstBaseParse gathers at least min_frame_size bytes of data either
68 * by pulling it from upstream or collecting buffers in an internal
71 * * A buffer of (at least) min_frame_size bytes is passed to subclass with
72 * @handle_frame. Subclass checks the contents and can optionally
73 * return GST_FLOW_OK along with an amount of data to be skipped to find
74 * a valid frame (which will result in a subsequent DISCONT).
75 * If, otherwise, the buffer does not hold a complete frame,
76 * @handle_frame can merely return and will be called again when additional
77 * data is available. In push mode this amounts to an
78 * additional input buffer (thus minimal additional latency), in pull mode
79 * this amounts to some arbitrary reasonable buffer size increase.
80 * Of course, gst_base_parse_set_min_frame_size() could also be used if a
81 * very specific known amount of additional data is required.
82 * If, however, the buffer holds a complete valid frame, it can pass
83 * the size of this frame to gst_base_parse_finish_frame().
84 * If acting as a converter, it can also merely indicate consumed input data
85 * while simultaneously providing custom output data.
86 * Note that baseclass performs some processing (such as tracking
87 * overall consumed data rate versus duration) for each finished frame,
88 * but other state is only updated upon each call to @handle_frame
89 * (such as tracking upstream input timestamp).
91 * Subclass is also responsible for setting the buffer metadata
92 * (e.g. buffer timestamp and duration, or keyframe if applicable).
93 * (although the latter can also be done by #GstBaseParse if it is
94 * appropriately configured, see below). Frame is provided with
95 * timestamp derived from upstream (as much as generally possible),
96 * duration obtained from configuration (see below), and offset
97 * if meaningful (in pull mode).
99 * Note that @check_valid_frame might receive any small
100 * amount of input data when leftover data is being drained (e.g. at EOS).
102 * * As part of finish frame processing,
103 * just prior to actually pushing the buffer in question,
104 * it is passed to @pre_push_frame which gives subclass yet one
105 * last chance to examine buffer metadata, or to send some custom (tag)
106 * events, or to perform custom (segment) filtering.
108 * * During the parsing process #GstBaseParseClass will handle both srcpad
109 * and sinkpad events. They will be passed to subclass if @event or
110 * @src_event callbacks have been provided.
114 * * #GstBaseParse class calls @stop to inform the subclass that data
115 * parsing will be stopped.
117 * Subclass is responsible for providing pad template caps for
118 * source and sink pads. The pads need to be named "sink" and "src". It also
119 * needs to set the fixed caps on srcpad, when the format is ensured (e.g.
120 * when base class calls subclass' @set_sink_caps function).
122 * This base class uses %GST_FORMAT_DEFAULT as a meaning of frames. So,
123 * subclass conversion routine needs to know that conversion from
124 * %GST_FORMAT_TIME to %GST_FORMAT_DEFAULT must return the
125 * frame number that can be found from the given byte position.
127 * #GstBaseParse uses subclasses conversion methods also for seeking (or
128 * otherwise uses its own default one, see also below).
130 * Subclass @start and @stop functions will be called to inform the beginning
131 * and end of data processing.
133 * Things that subclass need to take care of:
135 * * Provide pad templates
136 * * Fixate the source pad caps when appropriate
137 * * Inform base class how big data chunks should be retrieved. This is
138 * done with gst_base_parse_set_min_frame_size() function.
139 * * Examine data chunks passed to subclass with @handle_frame and pass
140 * proper frame(s) to gst_base_parse_finish_frame(), and setting src pad
141 * caps and timestamps on frame.
142 * * Provide conversion functions
143 * * Update the duration information with gst_base_parse_set_duration()
144 * * Optionally passthrough using gst_base_parse_set_passthrough()
145 * * Configure various baseparse parameters using
146 * gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
147 * and gst_base_parse_set_frame_rate().
149 * * In particular, if subclass is unable to determine a duration, but
150 * parsing (or specs) yields a frames per seconds rate, then this can be
151 * provided to #GstBaseParse to enable it to cater for
152 * buffer time metadata (which will be taken from upstream as much as
153 * possible). Internally keeping track of frame durations and respective
154 * sizes that have been pushed provides #GstBaseParse with an estimated
155 * bitrate. A default @convert (used if not overridden) will then use these
156 * rates to perform obvious conversions. These rates are also used to
157 * update (estimated) duration at regular frame intervals.
162 * - In push mode provide a queue of adapter-"queued" buffers for upstream
164 * - Queue buffers/events until caps are set
174 #include <gst/base/gstadapter.h>
176 #include "gstbaseparse.h"
178 /* FIXME: get rid of old GstIndex code */
179 #include "gstindex.h"
180 #include "gstindex.c"
181 #include "gstmemindex.c"
183 #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
185 #define MIN_FRAMES_TO_POST_BITRATE 10
186 #define TARGET_DIFFERENCE (20 * GST_SECOND)
187 #define MAX_INDEX_ENTRIES 4096
188 #define UPDATE_THRESHOLD 2
190 #define ABSDIFF(a,b) (((a) > (b)) ? ((a) - (b)) : ((b) - (a)))
192 GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
193 #define GST_CAT_DEFAULT gst_base_parse_debug
195 /* Supported formats */
196 static const GstFormat fmtlist[] = {
203 #define GST_BASE_PARSE_GET_PRIVATE(obj) \
204 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
206 struct _GstBaseParsePrivate
213 GstFormat duration_fmt;
214 gint64 estimated_duration;
215 gint64 estimated_drift;
217 guint min_frame_size;
218 gboolean disable_passthrough;
219 gboolean passthrough;
220 gboolean pts_interpolate;
223 gboolean has_timing_info;
224 guint fps_num, fps_den;
225 gint update_interval;
227 guint lead_in, lead_out;
228 GstClockTime lead_in_ts, lead_out_ts;
229 GstClockTime min_latency, max_latency;
238 GstClockTime next_pts;
239 GstClockTime next_dts;
240 GstClockTime prev_pts;
241 GstClockTime prev_dts;
242 gboolean prev_dts_from_pts;
243 GstClockTime frame_duration;
244 gboolean seen_keyframe;
250 guint64 data_bytecount;
251 guint64 acc_duration;
252 GstClockTime first_frame_pts;
253 GstClockTime first_frame_dts;
254 gint64 first_frame_offset;
256 gboolean post_min_bitrate;
257 gboolean post_avg_bitrate;
258 gboolean post_max_bitrate;
263 guint posted_avg_bitrate;
265 /* frames/buffers that are queued and ready to go on OK */
266 GQueue queued_frames;
270 /* index entry storage, either ours or provided */
276 /* seek table entries only maintained if upstream is BYTE seekable */
277 gboolean upstream_seekable;
278 gboolean upstream_has_duration;
279 gint64 upstream_size;
280 GstFormat upstream_format;
281 /* minimum distance between two index entries */
282 GstClockTimeDiff idx_interval;
283 guint64 idx_byte_interval;
284 /* ts and offset of last entry added */
285 GstClockTime index_last_ts;
286 gint64 index_last_offset;
287 gboolean index_last_valid;
289 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
290 gboolean exact_position;
291 /* seek events are temporarily kept to match them with newsegments */
292 GSList *pending_seeks;
294 /* reverse playback */
295 GSList *buffers_pending;
296 GSList *buffers_head;
297 GSList *buffers_queued;
298 GSList *buffers_send;
299 GstClockTime last_pts;
300 GstClockTime last_dts;
303 /* Pending serialized events */
304 GList *pending_events;
306 /* If baseparse has checked the caps to identify if it is
307 * handling video or audio */
308 gboolean checked_media;
310 /* offset of last parsed frame/data */
312 /* force a new frame, regardless of offset */
314 /* whether we are merely scanning for a frame */
316 /* ... and resulting frame, if any */
317 GstBaseParseFrame *scanned_frame;
319 /* TRUE if we're still detecting the format, i.e.
320 * if ::detect() is still called for future buffers */
322 GList *detect_buffers;
323 guint detect_buffers_size;
325 /* True when no buffers have been received yet */
326 gboolean first_buffer;
328 /* if TRUE, a STREAM_START event needs to be pushed */
329 gboolean push_stream_start;
331 /* When we need to skip more data than we have currently */
334 /* Tag handling (stream tags only, global tags are passed through as-is) */
335 GstTagList *upstream_tags;
336 GstTagList *parser_tags;
337 GstTagMergeMode parser_tags_merge_mode;
338 gboolean tags_changed;
341 typedef struct _GstBaseParseSeek
346 GstClockTime start_ts;
349 #define DEFAULT_DISABLE_PASSTHROUGH FALSE
354 PROP_DISABLE_PASSTHROUGH,
358 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
359 g_mutex_lock (&parse->priv->index_lock);
360 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
361 g_mutex_unlock (&parse->priv->index_lock);
363 static GstElementClass *parent_class = NULL;
365 static void gst_base_parse_class_init (GstBaseParseClass * klass);
366 static void gst_base_parse_init (GstBaseParse * parse,
367 GstBaseParseClass * klass);
370 gst_base_parse_get_type (void)
372 static volatile gsize base_parse_type = 0;
374 if (g_once_init_enter (&base_parse_type)) {
375 static const GTypeInfo base_parse_info = {
376 sizeof (GstBaseParseClass),
377 (GBaseInitFunc) NULL,
378 (GBaseFinalizeFunc) NULL,
379 (GClassInitFunc) gst_base_parse_class_init,
382 sizeof (GstBaseParse),
384 (GInstanceInitFunc) gst_base_parse_init,
388 _type = g_type_register_static (GST_TYPE_ELEMENT,
389 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
390 g_once_init_leave (&base_parse_type, _type);
392 return (GType) base_parse_type;
395 static void gst_base_parse_finalize (GObject * object);
397 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
398 GstStateChange transition);
399 static void gst_base_parse_reset (GstBaseParse * parse);
402 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
403 static GstIndex *gst_base_parse_get_index (GstElement * element);
406 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
408 static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
409 GstObject * parent, GstPadMode mode, gboolean active);
410 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
412 static void gst_base_parse_set_upstream_tags (GstBaseParse * parse,
413 GstTagList * taglist);
415 static void gst_base_parse_set_property (GObject * object, guint prop_id,
416 const GValue * value, GParamSpec * pspec);
417 static void gst_base_parse_get_property (GObject * object, guint prop_id,
418 GValue * value, GParamSpec * pspec);
420 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
422 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
425 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
427 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
430 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
432 static void gst_base_parse_loop (GstPad * pad);
434 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
435 GstBaseParseFrame * frame);
437 static gboolean gst_base_parse_sink_event_default (GstBaseParse * parse,
440 static gboolean gst_base_parse_src_event_default (GstBaseParse * parse,
443 static gboolean gst_base_parse_sink_query_default (GstBaseParse * parse,
445 static gboolean gst_base_parse_src_query_default (GstBaseParse * parse,
448 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
449 GstClockTime time, gboolean before, GstClockTime * _ts);
450 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
451 GstClockTime * _time, gint64 * _offset);
453 static GstFlowReturn gst_base_parse_start_fragment (GstBaseParse * parse);
454 static GstFlowReturn gst_base_parse_finish_fragment (GstBaseParse * parse,
456 static GstFlowReturn gst_base_parse_send_buffers (GstBaseParse * parse);
458 static inline GstFlowReturn gst_base_parse_check_sync (GstBaseParse * parse);
460 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
462 static void gst_base_parse_push_pending_events (GstBaseParse * parse);
465 gst_base_parse_clear_queues (GstBaseParse * parse)
467 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
468 g_slist_free (parse->priv->buffers_queued);
469 parse->priv->buffers_queued = NULL;
470 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
472 g_slist_free (parse->priv->buffers_pending);
473 parse->priv->buffers_pending = NULL;
474 g_slist_foreach (parse->priv->buffers_head, (GFunc) gst_buffer_unref, NULL);
475 g_slist_free (parse->priv->buffers_head);
476 parse->priv->buffers_head = NULL;
477 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
478 g_slist_free (parse->priv->buffers_send);
479 parse->priv->buffers_send = NULL;
481 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
482 g_list_free (parse->priv->detect_buffers);
483 parse->priv->detect_buffers = NULL;
484 parse->priv->detect_buffers_size = 0;
486 g_queue_foreach (&parse->priv->queued_frames,
487 (GFunc) gst_base_parse_frame_free, NULL);
488 g_queue_clear (&parse->priv->queued_frames);
490 gst_buffer_replace (&parse->priv->cache, NULL);
492 g_list_foreach (parse->priv->pending_events, (GFunc) gst_event_unref, NULL);
493 g_list_free (parse->priv->pending_events);
494 parse->priv->pending_events = NULL;
496 parse->priv->checked_media = FALSE;
500 gst_base_parse_finalize (GObject * object)
502 GstBaseParse *parse = GST_BASE_PARSE (object);
504 g_object_unref (parse->priv->adapter);
506 if (parse->priv->index) {
507 gst_object_unref (parse->priv->index);
508 parse->priv->index = NULL;
510 g_mutex_clear (&parse->priv->index_lock);
512 gst_base_parse_clear_queues (parse);
514 G_OBJECT_CLASS (parent_class)->finalize (object);
518 gst_base_parse_class_init (GstBaseParseClass * klass)
520 GObjectClass *gobject_class;
521 GstElementClass *gstelement_class;
523 gobject_class = G_OBJECT_CLASS (klass);
524 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
525 parent_class = g_type_class_peek_parent (klass);
527 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
528 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_base_parse_set_property);
529 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_base_parse_get_property);
532 * GstBaseParse:disable-passthrough:
534 * If set to %TRUE, baseparse will unconditionally force parsing of the
535 * incoming data. This can be required in the rare cases where the incoming
536 * side-data (caps, pts, dts, ...) is not trusted by the user and wants to
537 * force validation and parsing of the incoming data.
538 * If set to %FALSE, decision of whether to parse the data or not is up to
539 * the implementation (standard behaviour).
541 g_object_class_install_property (gobject_class, PROP_DISABLE_PASSTHROUGH,
542 g_param_spec_boolean ("disable-passthrough", "Disable passthrough",
543 "Force processing (disables passthrough)",
544 DEFAULT_DISABLE_PASSTHROUGH,
545 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
547 gstelement_class = (GstElementClass *) klass;
548 gstelement_class->change_state =
549 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
552 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
553 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
556 /* Default handlers */
557 klass->sink_event = gst_base_parse_sink_event_default;
558 klass->src_event = gst_base_parse_src_event_default;
559 klass->sink_query = gst_base_parse_sink_query_default;
560 klass->src_query = gst_base_parse_src_query_default;
561 klass->convert = gst_base_parse_convert_default;
563 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
564 "baseparse element");
568 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
570 GstPadTemplate *pad_template;
572 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
574 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
577 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
578 g_return_if_fail (pad_template != NULL);
579 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
580 gst_pad_set_event_function (parse->sinkpad,
581 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
582 gst_pad_set_query_function (parse->sinkpad,
583 GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
584 gst_pad_set_chain_function (parse->sinkpad,
585 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
586 gst_pad_set_activate_function (parse->sinkpad,
587 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
588 gst_pad_set_activatemode_function (parse->sinkpad,
589 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
590 GST_PAD_SET_PROXY_ALLOCATION (parse->sinkpad);
591 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
593 GST_DEBUG_OBJECT (parse, "sinkpad created");
596 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
597 g_return_if_fail (pad_template != NULL);
598 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
599 gst_pad_set_event_function (parse->srcpad,
600 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
601 gst_pad_set_query_function (parse->srcpad,
602 GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
603 gst_pad_use_fixed_caps (parse->srcpad);
604 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
605 GST_DEBUG_OBJECT (parse, "src created");
607 g_queue_init (&parse->priv->queued_frames);
609 parse->priv->adapter = gst_adapter_new ();
611 parse->priv->pad_mode = GST_PAD_MODE_NONE;
613 g_mutex_init (&parse->priv->index_lock);
616 gst_base_parse_reset (parse);
617 GST_DEBUG_OBJECT (parse, "init ok");
619 GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE);
621 parse->priv->upstream_tags = NULL;
622 parse->priv->parser_tags = NULL;
623 parse->priv->parser_tags_merge_mode = GST_TAG_MERGE_APPEND;
627 gst_base_parse_set_property (GObject * object, guint prop_id,
628 const GValue * value, GParamSpec * pspec)
630 GstBaseParse *parse = GST_BASE_PARSE (object);
633 case PROP_DISABLE_PASSTHROUGH:
634 parse->priv->disable_passthrough = g_value_get_boolean (value);
637 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
643 gst_base_parse_get_property (GObject * object, guint prop_id, GValue * value,
646 GstBaseParse *parse = GST_BASE_PARSE (object);
649 case PROP_DISABLE_PASSTHROUGH:
650 g_value_set_boolean (value, parse->priv->disable_passthrough);
653 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
659 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
661 GstBaseParseFrame *copy;
663 copy = g_slice_dup (GstBaseParseFrame, frame);
664 copy->buffer = gst_buffer_ref (frame->buffer);
665 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
667 GST_TRACE ("copied frame %p -> %p", frame, copy);
673 gst_base_parse_frame_free (GstBaseParseFrame * frame)
675 GST_TRACE ("freeing frame %p", frame);
678 gst_buffer_unref (frame->buffer);
679 frame->buffer = NULL;
682 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
683 g_slice_free (GstBaseParseFrame, frame);
685 memset (frame, 0, sizeof (*frame));
689 G_DEFINE_BOXED_TYPE (GstBaseParseFrame, gst_base_parse_frame,
690 (GBoxedCopyFunc) gst_base_parse_frame_copy,
691 (GBoxedFreeFunc) gst_base_parse_frame_free);
694 * gst_base_parse_frame_init:
695 * @frame: #GstBaseParseFrame.
697 * Sets a #GstBaseParseFrame to initial state. Currently this means
698 * all public fields are zero-ed and a private flag is set to make
699 * sure gst_base_parse_frame_free() only frees the contents but not
700 * the actual frame. Use this function to initialise a #GstBaseParseFrame
701 * allocated on the stack.
704 gst_base_parse_frame_init (GstBaseParseFrame * frame)
706 memset (frame, 0, sizeof (GstBaseParseFrame));
707 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
708 GST_TRACE ("inited frame %p", frame);
712 * gst_base_parse_frame_new:
713 * @buffer: (transfer none): a #GstBuffer
715 * @overhead: number of bytes in this frame which should be counted as
716 * metadata overhead, ie. not used to calculate the average bitrate.
717 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
719 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
720 * elements written in C should usually allocate the frame on the stack and
721 * then use gst_base_parse_frame_init() to initialise it.
723 * Returns: a newly-allocated #GstBaseParseFrame. Free with
724 * gst_base_parse_frame_free() when no longer needed.
727 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
730 GstBaseParseFrame *frame;
732 frame = g_slice_new0 (GstBaseParseFrame);
733 frame->buffer = gst_buffer_ref (buffer);
735 GST_TRACE ("created frame %p", frame);
740 gst_base_parse_update_flags (GstBaseParse * parse)
744 /* set flags one by one for clarity */
745 if (G_UNLIKELY (parse->priv->drain))
746 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
748 /* losing sync is pretty much a discont (and vice versa), no ? */
749 if (G_UNLIKELY (parse->priv->discont))
750 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
754 gst_base_parse_update_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
756 if (G_UNLIKELY (parse->priv->discont)) {
757 GST_DEBUG_OBJECT (parse, "marking DISCONT");
758 GST_BUFFER_FLAG_SET (frame->buffer, GST_BUFFER_FLAG_DISCONT);
760 GST_BUFFER_FLAG_UNSET (frame->buffer, GST_BUFFER_FLAG_DISCONT);
763 if (parse->priv->prev_offset != parse->priv->offset || parse->priv->new_frame) {
764 GST_LOG_OBJECT (parse, "marking as new frame");
765 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME;
768 frame->offset = parse->priv->prev_offset = parse->priv->offset;
772 gst_base_parse_reset (GstBaseParse * parse)
774 GST_OBJECT_LOCK (parse);
775 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
776 parse->priv->duration = -1;
777 parse->priv->min_frame_size = 1;
778 parse->priv->discont = TRUE;
779 parse->priv->flushing = FALSE;
780 parse->priv->saw_gaps = FALSE;
781 parse->priv->offset = 0;
782 parse->priv->sync_offset = 0;
783 parse->priv->update_interval = -1;
784 parse->priv->fps_num = parse->priv->fps_den = 0;
785 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
786 parse->priv->lead_in = parse->priv->lead_out = 0;
787 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
788 parse->priv->bitrate = 0;
789 parse->priv->framecount = 0;
790 parse->priv->bytecount = 0;
791 parse->priv->acc_duration = 0;
792 parse->priv->first_frame_pts = GST_CLOCK_TIME_NONE;
793 parse->priv->first_frame_dts = GST_CLOCK_TIME_NONE;
794 parse->priv->first_frame_offset = -1;
795 parse->priv->estimated_duration = -1;
796 parse->priv->estimated_drift = 0;
797 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
798 parse->priv->next_dts = 0;
799 parse->priv->syncable = TRUE;
800 parse->priv->disable_passthrough = DEFAULT_DISABLE_PASSTHROUGH;
801 parse->priv->passthrough = FALSE;
802 parse->priv->pts_interpolate = TRUE;
803 parse->priv->infer_ts = TRUE;
804 parse->priv->has_timing_info = FALSE;
805 parse->priv->min_bitrate = G_MAXUINT;
806 parse->priv->max_bitrate = 0;
807 parse->priv->avg_bitrate = 0;
808 parse->priv->posted_avg_bitrate = 0;
810 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
811 parse->priv->index_last_offset = -1;
812 parse->priv->index_last_valid = TRUE;
813 parse->priv->upstream_seekable = FALSE;
814 parse->priv->upstream_size = 0;
815 parse->priv->upstream_has_duration = FALSE;
816 parse->priv->upstream_format = GST_FORMAT_UNDEFINED;
817 parse->priv->idx_interval = 0;
818 parse->priv->idx_byte_interval = 0;
819 parse->priv->exact_position = TRUE;
820 parse->priv->seen_keyframe = FALSE;
821 parse->priv->checked_media = FALSE;
823 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
824 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
825 parse->priv->last_offset = 0;
827 parse->priv->skip = 0;
829 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
831 g_list_free (parse->priv->pending_events);
832 parse->priv->pending_events = NULL;
834 if (parse->priv->cache) {
835 gst_buffer_unref (parse->priv->cache);
836 parse->priv->cache = NULL;
839 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
840 g_slist_free (parse->priv->pending_seeks);
841 parse->priv->pending_seeks = NULL;
843 if (parse->priv->adapter)
844 gst_adapter_clear (parse->priv->adapter);
846 gst_base_parse_set_upstream_tags (parse, NULL);
848 if (parse->priv->parser_tags) {
849 gst_tag_list_unref (parse->priv->parser_tags);
850 parse->priv->parser_tags = NULL;
852 parse->priv->parser_tags_merge_mode = GST_TAG_MERGE_APPEND;
854 parse->priv->new_frame = TRUE;
856 parse->priv->first_buffer = TRUE;
858 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
859 g_list_free (parse->priv->detect_buffers);
860 parse->priv->detect_buffers = NULL;
861 parse->priv->detect_buffers_size = 0;
862 GST_OBJECT_UNLOCK (parse);
866 gst_base_parse_check_bitrate_tag (GstBaseParse * parse, const gchar * tag)
868 gboolean got_tag = FALSE;
871 if (parse->priv->upstream_tags != NULL)
872 got_tag = gst_tag_list_get_uint (parse->priv->upstream_tags, tag, &n);
874 if (!got_tag && parse->priv->parser_tags != NULL)
875 got_tag = gst_tag_list_get_uint (parse->priv->parser_tags, tag, &n);
880 /* check if upstream or subclass tags contain bitrates already */
882 gst_base_parse_check_bitrate_tags (GstBaseParse * parse)
884 parse->priv->post_min_bitrate =
885 !gst_base_parse_check_bitrate_tag (parse, GST_TAG_MINIMUM_BITRATE);
886 parse->priv->post_avg_bitrate =
887 !gst_base_parse_check_bitrate_tag (parse, GST_TAG_BITRATE);
888 parse->priv->post_max_bitrate =
889 !gst_base_parse_check_bitrate_tag (parse, GST_TAG_MAXIMUM_BITRATE);
892 /* Queues new tag event with the current combined state of the stream tags
893 * (i.e. upstream tags merged with subclass tags and current baseparse tags) */
895 gst_base_parse_queue_tag_event_update (GstBaseParse * parse)
897 GstTagList *merged_tags;
899 GST_LOG_OBJECT (parse, "upstream : %" GST_PTR_FORMAT,
900 parse->priv->upstream_tags);
901 GST_LOG_OBJECT (parse, "parser : %" GST_PTR_FORMAT,
902 parse->priv->parser_tags);
903 GST_LOG_OBJECT (parse, "mode : %d", parse->priv->parser_tags_merge_mode);
906 gst_tag_list_merge (parse->priv->upstream_tags, parse->priv->parser_tags,
907 parse->priv->parser_tags_merge_mode);
909 GST_DEBUG_OBJECT (parse, "merged : %" GST_PTR_FORMAT, merged_tags);
911 if (merged_tags == NULL)
914 if (gst_tag_list_is_empty (merged_tags)) {
915 gst_tag_list_unref (merged_tags);
919 if (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE) {
920 /* only add bitrate tags to non-empty taglists for now, and only if neither
921 * upstream tags nor the subclass sets the bitrate tag in question already */
922 if (parse->priv->min_bitrate != G_MAXUINT && parse->priv->post_min_bitrate) {
923 GST_LOG_OBJECT (parse, "adding min bitrate %u", parse->priv->min_bitrate);
924 gst_tag_list_add (merged_tags, GST_TAG_MERGE_KEEP,
925 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
927 if (parse->priv->max_bitrate != 0 && parse->priv->post_max_bitrate) {
928 GST_LOG_OBJECT (parse, "adding max bitrate %u", parse->priv->max_bitrate);
929 gst_tag_list_add (merged_tags, GST_TAG_MERGE_KEEP,
930 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
932 if (parse->priv->avg_bitrate != 0 && parse->priv->post_avg_bitrate) {
933 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
934 GST_LOG_OBJECT (parse, "adding avg bitrate %u", parse->priv->avg_bitrate);
935 gst_tag_list_add (merged_tags, GST_TAG_MERGE_KEEP,
936 GST_TAG_BITRATE, parse->priv->avg_bitrate, NULL);
940 parse->priv->pending_events =
941 g_list_prepend (parse->priv->pending_events,
942 gst_event_new_tag (merged_tags));
945 /* gst_base_parse_parse_frame:
946 * @parse: #GstBaseParse.
947 * @buffer: #GstBuffer.
949 * Default callback for parse_frame.
952 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
954 GstBuffer *buffer = frame->buffer;
956 if (!GST_BUFFER_PTS_IS_VALID (buffer) &&
957 GST_CLOCK_TIME_IS_VALID (parse->priv->next_pts)) {
958 GST_BUFFER_PTS (buffer) = parse->priv->next_pts;
960 if (!GST_BUFFER_DTS_IS_VALID (buffer) &&
961 GST_CLOCK_TIME_IS_VALID (parse->priv->next_dts)) {
962 GST_BUFFER_DTS (buffer) = parse->priv->next_dts;
964 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
965 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
966 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
971 /* gst_base_parse_convert:
972 * @parse: #GstBaseParse.
973 * @src_format: #GstFormat describing the source format.
974 * @src_value: Source value to be converted.
975 * @dest_format: #GstFormat defining the converted format.
976 * @dest_value: Pointer where the conversion result will be put.
978 * Converts using configured "convert" vmethod in #GstBaseParse class.
980 * Returns: %TRUE if conversion was successful.
983 gst_base_parse_convert (GstBaseParse * parse,
984 GstFormat src_format,
985 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
987 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
990 g_return_val_if_fail (dest_value != NULL, FALSE);
995 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
997 #ifndef GST_DISABLE_GST_DEBUG
1000 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
1001 GST_LOG_OBJECT (parse,
1002 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
1003 GST_TIME_ARGS (src_value), *dest_value);
1004 } else if (dest_format == GST_FORMAT_TIME &&
1005 src_format == GST_FORMAT_BYTES) {
1006 GST_LOG_OBJECT (parse,
1007 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
1008 src_value, GST_TIME_ARGS (*dest_value));
1010 GST_LOG_OBJECT (parse,
1011 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
1012 GST_STR_NULL (gst_format_get_name (src_format)),
1013 GST_STR_NULL (gst_format_get_name (dest_format)),
1014 src_value, *dest_value);
1017 GST_DEBUG_OBJECT (parse, "conversion failed");
1026 update_upstream_provided (GQuark field_id, const GValue * value,
1029 GstCaps *default_caps = user_data;
1033 caps_size = gst_caps_get_size (default_caps);
1034 for (i = 0; i < caps_size; i++) {
1035 GstStructure *structure = gst_caps_get_structure (default_caps, i);
1036 if (gst_structure_id_has_field (structure, field_id))
1037 gst_structure_id_set_value (structure, field_id, value);
1044 gst_base_parse_negotiate_default_caps (GstBaseParse * parse)
1046 GstCaps *caps, *templcaps;
1047 GstCaps *sinkcaps = NULL;
1048 GstCaps *default_caps = NULL;
1049 GstStructure *structure;
1051 templcaps = gst_pad_get_pad_template_caps (GST_BASE_PARSE_SRC_PAD (parse));
1052 caps = gst_pad_peer_query_caps (GST_BASE_PARSE_SRC_PAD (parse), templcaps);
1054 gst_caps_unref (templcaps);
1059 if (!caps || gst_caps_is_empty (caps) || gst_caps_is_any (caps)) {
1063 GST_LOG_OBJECT (parse, "peer caps %" GST_PTR_FORMAT, caps);
1065 /* before fixating, try to use whatever upstream provided */
1066 default_caps = gst_caps_copy (caps);
1067 sinkcaps = gst_pad_get_current_caps (GST_BASE_PARSE_SINK_PAD (parse));
1069 GST_LOG_OBJECT (parse, "current caps %" GST_PTR_FORMAT " for sinkpad",
1073 structure = gst_caps_get_structure (sinkcaps, 0);
1074 gst_structure_foreach (structure, update_upstream_provided, default_caps);
1077 default_caps = gst_caps_fixate (default_caps);
1079 if (!default_caps) {
1080 GST_WARNING_OBJECT (parse, "Failed to create default caps !");
1084 GST_INFO_OBJECT (parse,
1085 "Chose default caps %" GST_PTR_FORMAT " for initial gap", default_caps);
1088 gst_caps_unref (sinkcaps);
1089 gst_caps_unref (caps);
1091 return default_caps;
1096 gst_caps_unref (caps);
1098 gst_caps_unref (sinkcaps);
1103 /* gst_base_parse_sink_event:
1104 * @pad: #GstPad that received the event.
1105 * @event: #GstEvent to be handled.
1107 * Handler for sink pad events.
1109 * Returns: %TRUE if the event was handled.
1112 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
1114 GstBaseParse *parse = GST_BASE_PARSE (parent);
1115 GstBaseParseClass *bclass = GST_BASE_PARSE_GET_CLASS (parse);
1118 ret = bclass->sink_event (parse, event);
1123 /* gst_base_parse_sink_event_default:
1124 * @parse: #GstBaseParse.
1125 * @event: #GstEvent to be handled.
1127 * Element-level event handler function.
1129 * The event will be unreffed only if it has been handled and this
1130 * function returns %TRUE
1132 * Returns: %TRUE if the event was handled and not need forwarding.
1135 gst_base_parse_sink_event_default (GstBaseParse * parse, GstEvent * event)
1137 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1138 gboolean ret = FALSE;
1139 gboolean forward_immediate = FALSE;
1141 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
1142 GST_EVENT_TYPE_NAME (event));
1144 switch (GST_EVENT_TYPE (event)) {
1145 case GST_EVENT_CAPS:
1149 gst_event_parse_caps (event, &caps);
1150 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
1152 if (klass->set_sink_caps)
1153 ret = klass->set_sink_caps (parse, caps);
1157 /* will send our own caps downstream */
1158 gst_event_unref (event);
1162 case GST_EVENT_SEGMENT:
1164 const GstSegment *in_segment;
1165 GstSegment out_segment;
1166 gint64 offset = 0, next_dts;
1167 guint32 seqnum = gst_event_get_seqnum (event);
1169 gst_event_parse_segment (event, &in_segment);
1170 gst_segment_init (&out_segment, GST_FORMAT_TIME);
1171 out_segment.rate = in_segment->rate;
1172 out_segment.applied_rate = in_segment->applied_rate;
1174 GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
1176 parse->priv->upstream_format = in_segment->format;
1177 if (in_segment->format == GST_FORMAT_BYTES) {
1178 GstBaseParseSeek *seek = NULL;
1181 /* stop time is allowed to be open-ended, but not start & pos */
1182 offset = in_segment->time;
1184 GST_OBJECT_LOCK (parse);
1185 for (node = parse->priv->pending_seeks; node; node = node->next) {
1186 GstBaseParseSeek *tmp = node->data;
1188 if (tmp->offset == offset) {
1193 parse->priv->pending_seeks =
1194 g_slist_remove (parse->priv->pending_seeks, seek);
1195 GST_OBJECT_UNLOCK (parse);
1198 GST_DEBUG_OBJECT (parse,
1199 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
1200 seek->accurate ? " accurate" : "", &seek->segment);
1202 out_segment.start = seek->segment.start;
1203 out_segment.stop = seek->segment.stop;
1204 out_segment.time = seek->segment.start;
1206 next_dts = seek->start_ts;
1207 parse->priv->exact_position = seek->accurate;
1210 /* best attempt convert */
1211 /* as these are only estimates, stop is kept open-ended to avoid
1212 * premature cutting */
1213 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
1214 GST_FORMAT_TIME, (gint64 *) & next_dts);
1216 out_segment.start = next_dts;
1217 out_segment.stop = GST_CLOCK_TIME_NONE;
1218 out_segment.time = next_dts;
1220 parse->priv->exact_position = (in_segment->start == 0);
1223 gst_event_unref (event);
1225 event = gst_event_new_segment (&out_segment);
1226 gst_event_set_seqnum (event, seqnum);
1228 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1229 GST_SEGMENT_FORMAT, in_segment);
1231 } else if (in_segment->format != GST_FORMAT_TIME) {
1232 /* Unknown incoming segment format. Output a default open-ended
1234 gst_event_unref (event);
1236 out_segment.start = 0;
1237 out_segment.stop = GST_CLOCK_TIME_NONE;
1238 out_segment.time = 0;
1240 event = gst_event_new_segment (&out_segment);
1241 gst_event_set_seqnum (event, seqnum);
1245 /* not considered BYTE seekable if it is talking to us in TIME,
1246 * whatever else it might claim */
1247 parse->priv->upstream_seekable = FALSE;
1248 next_dts = in_segment->start;
1249 gst_event_copy_segment (event, &out_segment);
1252 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1255 gst_segment_set_newsegment (&parse->segment, update, rate,
1256 applied_rate, format, start, stop, start);
1261 /* save the segment for later, right before we push a new buffer so that
1262 * the caps are fixed and the next linked element can receive
1263 * the segment but finish the current segment */
1264 GST_DEBUG_OBJECT (parse, "draining current segment");
1265 if (in_segment->rate > 0.0)
1266 gst_base_parse_drain (parse);
1268 gst_base_parse_finish_fragment (parse, FALSE);
1269 gst_adapter_clear (parse->priv->adapter);
1271 parse->priv->offset = offset;
1272 parse->priv->sync_offset = offset;
1273 parse->priv->next_dts = next_dts;
1274 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
1275 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
1276 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
1277 parse->priv->prev_pts = GST_CLOCK_TIME_NONE;
1278 parse->priv->prev_dts = GST_CLOCK_TIME_NONE;
1279 parse->priv->prev_dts_from_pts = FALSE;
1280 parse->priv->discont = TRUE;
1281 parse->priv->seen_keyframe = FALSE;
1282 parse->priv->skip = 0;
1286 case GST_EVENT_SEGMENT_DONE:
1287 /* need to drain now, rather than upon a new segment,
1288 * since that would have SEGMENT_DONE come before potential
1289 * delayed last part of the current segment */
1290 GST_DEBUG_OBJECT (parse, "draining current segment");
1291 if (parse->segment.rate > 0.0)
1292 gst_base_parse_drain (parse);
1294 gst_base_parse_finish_fragment (parse, FALSE);
1295 /* Also forward event immediately, there might be no new data
1296 * coming afterwards that would allow us to forward it later */
1297 forward_immediate = TRUE;
1300 case GST_EVENT_FLUSH_START:
1301 GST_OBJECT_LOCK (parse);
1302 parse->priv->flushing = TRUE;
1303 GST_OBJECT_UNLOCK (parse);
1306 case GST_EVENT_FLUSH_STOP:
1307 gst_adapter_clear (parse->priv->adapter);
1308 gst_base_parse_clear_queues (parse);
1309 parse->priv->flushing = FALSE;
1310 parse->priv->discont = TRUE;
1311 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
1312 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
1313 parse->priv->new_frame = TRUE;
1314 parse->priv->skip = 0;
1316 forward_immediate = TRUE;
1320 if (parse->segment.rate > 0.0)
1321 gst_base_parse_drain (parse);
1323 gst_base_parse_finish_fragment (parse, TRUE);
1325 /* If we STILL have zero frames processed, fire an error */
1326 if (parse->priv->framecount == 0 && !parse->priv->saw_gaps &&
1327 !parse->priv->first_buffer) {
1328 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1329 ("No valid frames found before end of stream"), (NULL));
1332 if (!parse->priv->saw_gaps
1333 && parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1334 /* We've not posted bitrate tags yet - do so now */
1335 gst_base_parse_queue_tag_event_update (parse);
1338 /* newsegment and other serialized events before eos */
1339 gst_base_parse_push_pending_events (parse);
1341 forward_immediate = TRUE;
1343 case GST_EVENT_CUSTOM_DOWNSTREAM:{
1344 /* FIXME: Code duplicated from libgstvideo because core can't depend on -base */
1345 #ifndef GST_VIDEO_EVENT_STILL_STATE_NAME
1346 #define GST_VIDEO_EVENT_STILL_STATE_NAME "GstEventStillFrame"
1349 const GstStructure *s;
1350 gboolean ev_still_state;
1352 s = gst_event_get_structure (event);
1354 gst_structure_has_name (s, GST_VIDEO_EVENT_STILL_STATE_NAME) &&
1355 gst_structure_get_boolean (s, "still-state", &ev_still_state)) {
1356 if (ev_still_state) {
1357 GST_DEBUG_OBJECT (parse, "draining current data for still-frame");
1358 if (parse->segment.rate > 0.0)
1359 gst_base_parse_drain (parse);
1361 gst_base_parse_finish_fragment (parse, TRUE);
1363 forward_immediate = TRUE;
1369 GST_DEBUG_OBJECT (parse, "draining current data due to gap event");
1371 /* Ensure we have caps before forwarding the event */
1372 if (!gst_pad_has_current_caps (GST_BASE_PARSE_SRC_PAD (parse))) {
1373 GstCaps *default_caps = NULL;
1374 if ((default_caps = gst_base_parse_negotiate_default_caps (parse))) {
1376 GstEvent *caps_event = gst_event_new_caps (default_caps);
1378 GST_DEBUG_OBJECT (parse,
1379 "Store caps event to pending list for initial pre-rolling");
1381 /* Events are in decreasing order. Go down the list until we
1382 * find the first pre-CAPS event and insert our CAPS event there.
1384 * There should be a SEGMENT event already, which is > CAPS */
1385 for (l = parse->priv->pending_events; l; l = l->next) {
1386 GstEvent *e = l->data;
1388 if (GST_EVENT_TYPE (e) < GST_EVENT_CAPS) {
1389 parse->priv->pending_events =
1390 g_list_insert_before (parse->priv->pending_events, l,
1395 /* No pending event that is < CAPS, so we have to add it at the very
1396 * end of the list */
1398 parse->priv->pending_events =
1399 g_list_append (parse->priv->pending_events, caps_event);
1401 gst_caps_unref (default_caps);
1403 gst_event_unref (event);
1406 GST_ELEMENT_ERROR (parse, STREAM, FORMAT, (NULL),
1407 ("Parser output not negotiated before GAP event."));
1412 gst_base_parse_push_pending_events (parse);
1414 if (parse->segment.rate > 0.0)
1415 gst_base_parse_drain (parse);
1417 gst_base_parse_finish_fragment (parse, TRUE);
1418 forward_immediate = TRUE;
1419 parse->priv->saw_gaps = TRUE;
1424 GstTagList *tags = NULL;
1426 gst_event_parse_tag (event, &tags);
1428 /* We only care about stream tags here, global tags we just forward */
1429 if (gst_tag_list_get_scope (tags) != GST_TAG_SCOPE_STREAM)
1432 gst_base_parse_set_upstream_tags (parse, tags);
1433 gst_base_parse_queue_tag_event_update (parse);
1434 parse->priv->tags_changed = FALSE;
1435 gst_event_unref (event);
1440 case GST_EVENT_STREAM_START:
1442 if (parse->priv->pad_mode != GST_PAD_MODE_PULL)
1443 forward_immediate = TRUE;
1445 gst_base_parse_set_upstream_tags (parse, NULL);
1446 parse->priv->tags_changed = TRUE;
1453 /* Forward non-serialized events and EOS/FLUSH_STOP immediately.
1454 * For EOS this is required because no buffer or serialized event
1455 * will come after EOS and nothing could trigger another
1456 * _finish_frame() call. *
1457 * If the subclass handles sending of EOS manually it can return
1458 * _DROPPED from ::finish() and all other subclasses should have
1459 * decoded/flushed all remaining data before this
1461 * For FLUSH_STOP this is required because it is expected
1462 * to be forwarded immediately and no buffers are queued anyway.
1465 if (!GST_EVENT_IS_SERIALIZED (event) || forward_immediate) {
1466 ret = gst_pad_push_event (parse->srcpad, event);
1468 parse->priv->pending_events =
1469 g_list_prepend (parse->priv->pending_events, event);
1474 GST_DEBUG_OBJECT (parse, "event handled");
1480 gst_base_parse_sink_query_default (GstBaseParse * parse, GstQuery * query)
1485 pad = GST_BASE_PARSE_SINK_PAD (parse);
1487 switch (GST_QUERY_TYPE (query)) {
1488 case GST_QUERY_CAPS:
1490 GstBaseParseClass *bclass;
1492 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1494 if (bclass->get_sink_caps) {
1495 GstCaps *caps, *filter;
1497 gst_query_parse_caps (query, &filter);
1498 caps = bclass->get_sink_caps (parse, filter);
1499 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1501 gst_query_set_caps_result (query, caps);
1502 gst_caps_unref (caps);
1506 GstCaps *caps, *template_caps, *filter;
1508 gst_query_parse_caps (query, &filter);
1509 template_caps = gst_pad_get_pad_template_caps (pad);
1510 if (filter != NULL) {
1512 gst_caps_intersect_full (filter, template_caps,
1513 GST_CAPS_INTERSECT_FIRST);
1514 gst_caps_unref (template_caps);
1516 caps = template_caps;
1518 gst_query_set_caps_result (query, caps);
1519 gst_caps_unref (caps);
1527 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
1536 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1538 GstBaseParseClass *bclass;
1539 GstBaseParse *parse;
1542 parse = GST_BASE_PARSE (parent);
1543 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1545 GST_DEBUG_OBJECT (parse, "%s query", GST_QUERY_TYPE_NAME (query));
1547 if (bclass->sink_query)
1548 ret = bclass->sink_query (parse, query);
1552 GST_LOG_OBJECT (parse, "%s query result: %d %" GST_PTR_FORMAT,
1553 GST_QUERY_TYPE_NAME (query), ret, query);
1559 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
1561 GstBaseParseClass *bclass;
1562 GstBaseParse *parse;
1565 parse = GST_BASE_PARSE (parent);
1566 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1568 GST_DEBUG_OBJECT (parse, "%s query: %" GST_PTR_FORMAT,
1569 GST_QUERY_TYPE_NAME (query), query);
1571 if (bclass->src_query)
1572 ret = bclass->src_query (parse, query);
1576 GST_LOG_OBJECT (parse, "%s query result: %d %" GST_PTR_FORMAT,
1577 GST_QUERY_TYPE_NAME (query), ret, query);
1582 /* gst_base_parse_src_event:
1583 * @pad: #GstPad that received the event.
1584 * @event: #GstEvent that was received.
1586 * Handler for source pad events.
1588 * Returns: %TRUE if the event was handled.
1591 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1593 GstBaseParse *parse;
1594 GstBaseParseClass *bclass;
1595 gboolean ret = TRUE;
1597 parse = GST_BASE_PARSE (parent);
1598 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1600 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1601 GST_EVENT_TYPE_NAME (event));
1603 if (bclass->src_event)
1604 ret = bclass->src_event (parse, event);
1606 gst_event_unref (event);
1612 gst_base_parse_is_seekable (GstBaseParse * parse)
1614 /* FIXME: could do more here, e.g. check index or just send data from 0
1615 * in pull mode and let decoder/sink clip */
1616 return parse->priv->syncable;
1619 /* gst_base_parse_src_event_default:
1620 * @parse: #GstBaseParse.
1621 * @event: #GstEvent that was received.
1623 * Default srcpad event handler.
1625 * Returns: %TRUE if the event was handled and can be dropped.
1628 gst_base_parse_src_event_default (GstBaseParse * parse, GstEvent * event)
1630 gboolean res = FALSE;
1632 switch (GST_EVENT_TYPE (event)) {
1633 case GST_EVENT_SEEK:
1634 if (gst_base_parse_is_seekable (parse))
1635 res = gst_base_parse_handle_seek (parse, event);
1638 res = gst_pad_event_default (parse->srcpad, GST_OBJECT_CAST (parse),
1647 * gst_base_parse_convert_default:
1648 * @parse: #GstBaseParse.
1649 * @src_format: #GstFormat describing the source format.
1650 * @src_value: Source value to be converted.
1651 * @dest_format: #GstFormat defining the converted format.
1652 * @dest_value: Pointer where the conversion result will be put.
1654 * Default implementation of "convert" vmethod in #GstBaseParse class.
1656 * Returns: %TRUE if conversion was successful.
1659 gst_base_parse_convert_default (GstBaseParse * parse,
1660 GstFormat src_format,
1661 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1663 gboolean ret = FALSE;
1664 guint64 bytes, duration;
1666 if (G_UNLIKELY (src_format == dest_format)) {
1667 *dest_value = src_value;
1671 if (G_UNLIKELY (src_value == -1)) {
1676 if (G_UNLIKELY (src_value == 0)) {
1681 if (parse->priv->upstream_format != GST_FORMAT_BYTES) {
1682 /* don't do byte format conversions if we're not really parsing
1683 * a raw elementary stream, since we don't really have BYTES
1684 * position / duration info */
1685 if (src_format == GST_FORMAT_BYTES || dest_format == GST_FORMAT_BYTES)
1686 goto no_slaved_conversions;
1689 /* need at least some frames */
1690 if (!parse->priv->framecount)
1693 duration = parse->priv->acc_duration / GST_MSECOND;
1694 bytes = parse->priv->bytecount;
1696 if (G_UNLIKELY (!duration || !bytes))
1697 goto no_duration_bytes;
1699 if (src_format == GST_FORMAT_BYTES) {
1700 if (dest_format == GST_FORMAT_TIME) {
1701 /* BYTES -> TIME conversion */
1702 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1703 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1704 *dest_value *= GST_MSECOND;
1705 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1706 *dest_value / GST_MSECOND);
1709 GST_DEBUG_OBJECT (parse, "converting bytes -> other not implemented");
1711 } else if (src_format == GST_FORMAT_TIME) {
1712 if (dest_format == GST_FORMAT_BYTES) {
1713 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1714 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1716 GST_DEBUG_OBJECT (parse,
1717 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1718 src_value / GST_MSECOND, *dest_value);
1721 GST_DEBUG_OBJECT (parse, "converting time -> other not implemented");
1723 } else if (src_format == GST_FORMAT_DEFAULT) {
1724 /* DEFAULT == frame-based */
1725 if (dest_format == GST_FORMAT_TIME) {
1726 GST_DEBUG_OBJECT (parse, "converting default -> time");
1727 if (parse->priv->fps_den) {
1728 *dest_value = gst_util_uint64_scale (src_value,
1729 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1733 GST_DEBUG_OBJECT (parse, "converting default -> other not implemented");
1736 GST_DEBUG_OBJECT (parse, "conversion not implemented");
1743 GST_DEBUG_OBJECT (parse, "no framecount");
1748 GST_DEBUG_OBJECT (parse, "no duration %" G_GUINT64_FORMAT ", bytes %"
1749 G_GUINT64_FORMAT, duration, bytes);
1752 no_slaved_conversions:
1754 GST_DEBUG_OBJECT (parse,
1755 "Can't do format conversions when upstream format is not BYTES");
1761 gst_base_parse_update_duration (GstBaseParse * parse)
1763 gint64 ptot, dest_value;
1765 if (!gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &ptot))
1768 if (!gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1769 GST_FORMAT_TIME, &dest_value))
1772 /* inform if duration changed, but try to avoid spamming */
1773 parse->priv->estimated_drift += dest_value - parse->priv->estimated_duration;
1775 parse->priv->estimated_duration = dest_value;
1776 GST_LOG_OBJECT (parse,
1777 "updated estimated duration to %" GST_TIME_FORMAT,
1778 GST_TIME_ARGS (dest_value));
1780 if (parse->priv->estimated_drift > GST_SECOND ||
1781 parse->priv->estimated_drift < -GST_SECOND) {
1782 gst_element_post_message (GST_ELEMENT (parse),
1783 gst_message_new_duration_changed (GST_OBJECT (parse)));
1784 parse->priv->estimated_drift = 0;
1788 /* gst_base_parse_update_bitrates:
1789 * @parse: #GstBaseParse.
1790 * @buffer: Current frame as a #GstBuffer
1792 * Keeps track of the minimum and maximum bitrates, and also maintains a
1793 * running average bitrate of the stream so far.
1796 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1798 guint64 data_len, frame_dur;
1799 gint overhead, frame_bitrate;
1800 GstBuffer *buffer = frame->buffer;
1802 overhead = frame->overhead;
1806 data_len = gst_buffer_get_size (buffer) - overhead;
1807 parse->priv->data_bytecount += data_len;
1809 /* duration should be valid by now,
1810 * either set by subclass or maybe based on fps settings */
1811 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1812 /* Calculate duration of a frame from buffer properties */
1813 frame_dur = GST_BUFFER_DURATION (buffer);
1814 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1815 parse->priv->acc_duration;
1818 /* No way to figure out frame duration (is this even possible?) */
1822 /* override if subclass provided bitrate, e.g. metadata based */
1823 if (parse->priv->bitrate) {
1824 parse->priv->avg_bitrate = parse->priv->bitrate;
1825 /* spread this (confirmed) info ASAP */
1826 if (parse->priv->post_avg_bitrate &&
1827 parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1828 parse->priv->tags_changed = TRUE;
1832 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1836 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1837 parse->priv->avg_bitrate);
1839 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
1842 if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE &&
1843 (parse->priv->post_min_bitrate || parse->priv->post_avg_bitrate
1844 || parse->priv->post_max_bitrate))
1845 parse->priv->tags_changed = TRUE;
1847 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1848 if (frame_bitrate < parse->priv->min_bitrate) {
1849 parse->priv->min_bitrate = frame_bitrate;
1850 if (parse->priv->post_min_bitrate)
1851 parse->priv->tags_changed = TRUE;
1854 if (frame_bitrate > parse->priv->max_bitrate) {
1855 parse->priv->max_bitrate = frame_bitrate;
1856 if (parse->priv->post_max_bitrate)
1857 parse->priv->tags_changed = TRUE;
1860 /* Only update the tag on a 2% change */
1861 if (parse->priv->post_avg_bitrate && parse->priv->avg_bitrate) {
1862 guint64 diffprev = gst_util_uint64_scale_int (100,
1863 ABSDIFF (parse->priv->avg_bitrate, parse->priv->posted_avg_bitrate),
1864 parse->priv->avg_bitrate);
1865 if (diffprev >= UPDATE_THRESHOLD)
1866 parse->priv->tags_changed = TRUE;
1872 * gst_base_parse_add_index_entry:
1873 * @parse: #GstBaseParse.
1874 * @offset: offset of entry
1875 * @ts: timestamp associated with offset
1876 * @key: whether entry refers to keyframe
1877 * @force: add entry disregarding sanity checks
1879 * Adds an entry to the index associating @offset to @ts. It is recommended
1880 * to only add keyframe entries. @force allows to bypass checks, such as
1881 * whether the stream is (upstream) seekable, another entry is already "close"
1882 * to the new entry, etc.
1884 * Returns: #gboolean indicating whether entry was added
1887 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1888 GstClockTime ts, gboolean key, gboolean force)
1890 gboolean ret = FALSE;
1891 GstIndexAssociation associations[2];
1893 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1894 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1896 if (G_LIKELY (!force)) {
1898 if (!parse->priv->upstream_seekable) {
1899 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1903 /* FIXME need better helper data structure that handles these issues
1904 * related to ongoing collecting of index entries */
1905 if (parse->priv->index_last_offset + parse->priv->idx_byte_interval >=
1907 GST_LOG_OBJECT (parse,
1908 "already have entries up to offset 0x%08" G_GINT64_MODIFIER "x",
1909 parse->priv->index_last_offset + parse->priv->idx_byte_interval);
1913 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1914 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1915 parse->priv->idx_interval) {
1916 GST_LOG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1917 GST_TIME_ARGS (parse->priv->index_last_ts));
1921 /* if last is not really the last one */
1922 if (!parse->priv->index_last_valid) {
1923 GstClockTime prev_ts;
1925 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1926 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1927 GST_LOG_OBJECT (parse,
1928 "entry too close to existing entry %" GST_TIME_FORMAT,
1929 GST_TIME_ARGS (prev_ts));
1930 parse->priv->index_last_offset = offset;
1931 parse->priv->index_last_ts = ts;
1937 associations[0].format = GST_FORMAT_TIME;
1938 associations[0].value = ts;
1939 associations[1].format = GST_FORMAT_BYTES;
1940 associations[1].value = offset;
1942 /* index might change on-the-fly, although that would be nutty app ... */
1943 GST_BASE_PARSE_INDEX_LOCK (parse);
1944 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1945 (key) ? GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT :
1946 GST_INDEX_ASSOCIATION_FLAG_DELTA_UNIT, 2,
1947 (const GstIndexAssociation *) &associations);
1948 GST_BASE_PARSE_INDEX_UNLOCK (parse);
1951 parse->priv->index_last_offset = offset;
1952 parse->priv->index_last_ts = ts;
1961 /* check for seekable upstream, above and beyond a mere query */
1963 gst_base_parse_check_seekability (GstBaseParse * parse)
1966 gboolean seekable = FALSE;
1967 gint64 start = -1, stop = -1;
1968 guint idx_interval = 0;
1969 guint64 idx_byte_interval = 0;
1971 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1972 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1973 GST_DEBUG_OBJECT (parse, "seeking query failed");
1977 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1979 /* try harder to query upstream size if we didn't get it the first time */
1980 if (seekable && stop == -1) {
1981 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1982 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1985 /* if upstream doesn't know the size, it's likely that it's not seekable in
1986 * practice even if it technically may be seekable */
1987 if (seekable && (start != 0 || stop <= start)) {
1988 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1992 /* let's not put every single frame into our index */
1994 if (stop < 10 * 1024 * 1024)
1996 else if (stop < 100 * 1024 * 1024)
1999 idx_interval = 1000;
2001 /* ensure that even for large files (e.g. very long audio files), the index
2002 * stays reasonably-size, with some arbitrary limit to the total number of
2004 idx_byte_interval = (stop - start) / MAX_INDEX_ENTRIES;
2005 GST_DEBUG_OBJECT (parse,
2006 "Limiting index entries to %d, indexing byte interval %"
2007 G_GUINT64_FORMAT " bytes", MAX_INDEX_ENTRIES, idx_byte_interval);
2011 gst_query_unref (query);
2013 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
2014 G_GUINT64_FORMAT ")", seekable, start, stop);
2015 parse->priv->upstream_seekable = seekable;
2016 parse->priv->upstream_size = seekable ? stop : 0;
2018 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
2019 parse->priv->idx_interval = idx_interval * GST_MSECOND;
2020 parse->priv->idx_byte_interval = idx_byte_interval;
2023 /* some misc checks on upstream */
2025 gst_base_parse_check_upstream (GstBaseParse * parse)
2029 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
2030 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
2031 /* upstream has one, accept it also, and no further updates */
2032 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
2033 parse->priv->upstream_has_duration = TRUE;
2036 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
2037 parse->priv->upstream_has_duration);
2040 /* checks src caps to determine if dealing with audio or video */
2041 /* TODO maybe forego automagic stuff and let subclass configure it ? */
2043 gst_base_parse_check_media (GstBaseParse * parse)
2048 caps = gst_pad_get_current_caps (parse->srcpad);
2049 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
2050 parse->priv->is_video =
2051 g_str_has_prefix (gst_structure_get_name (s), "video");
2053 /* historical default */
2054 parse->priv->is_video = FALSE;
2057 gst_caps_unref (caps);
2059 parse->priv->checked_media = TRUE;
2060 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
2063 /* takes ownership of frame */
2065 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
2067 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
2068 /* frame allocated on the heap, we can just take ownership */
2069 g_queue_push_tail (&parse->priv->queued_frames, frame);
2070 GST_TRACE ("queued frame %p", frame);
2072 GstBaseParseFrame *copy;
2074 /* probably allocated on the stack, must make a proper copy */
2075 copy = gst_base_parse_frame_copy (frame);
2076 g_queue_push_tail (&parse->priv->queued_frames, copy);
2077 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
2078 gst_base_parse_frame_free (frame);
2082 /* makes sure that @buf is properly prepared and decorated for passing
2083 * to baseclass, and an equally setup frame is returned setup with @buf.
2084 * Takes ownership of @buf. */
2085 static GstBaseParseFrame *
2086 gst_base_parse_prepare_frame (GstBaseParse * parse, GstBuffer * buffer)
2088 GstBaseParseFrame *frame = NULL;
2090 buffer = gst_buffer_make_writable (buffer);
2092 GST_LOG_OBJECT (parse,
2093 "preparing frame at offset %" G_GUINT64_FORMAT
2094 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
2095 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
2096 gst_buffer_get_size (buffer));
2098 GST_BUFFER_OFFSET (buffer) = parse->priv->offset;
2100 gst_base_parse_update_flags (parse);
2102 frame = gst_base_parse_frame_new (buffer, 0, 0);
2103 gst_buffer_unref (buffer);
2104 gst_base_parse_update_frame (parse, frame);
2106 /* clear flags for next frame */
2107 parse->priv->discont = FALSE;
2108 parse->priv->new_frame = FALSE;
2110 /* use default handler to provide initial (upstream) metadata */
2111 gst_base_parse_parse_frame (parse, frame);
2116 /* Wraps buffer in a frame and dispatches to subclass.
2117 * Also manages data skipping and offset handling (including adapter flushing).
2118 * Takes ownership of @buffer */
2119 static GstFlowReturn
2120 gst_base_parse_handle_buffer (GstBaseParse * parse, GstBuffer * buffer,
2121 gint * skip, gint * flushed)
2123 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
2124 GstBaseParseFrame *frame;
2127 g_return_val_if_fail (skip != NULL || flushed != NULL, GST_FLOW_ERROR);
2129 GST_LOG_OBJECT (parse,
2130 "handling buffer of size %" G_GSIZE_FORMAT " with dts %" GST_TIME_FORMAT
2131 ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
2132 gst_buffer_get_size (buffer), GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
2133 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
2134 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
2136 /* track what is being flushed during this single round of frame processing */
2137 parse->priv->flushed = 0;
2140 /* make it easy for _finish_frame to pick up input data */
2141 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
2142 gst_buffer_ref (buffer);
2143 gst_adapter_push (parse->priv->adapter, buffer);
2146 frame = gst_base_parse_prepare_frame (parse, buffer);
2147 ret = klass->handle_frame (parse, frame, skip);
2149 *flushed = parse->priv->flushed;
2151 GST_LOG_OBJECT (parse, "handle_frame skipped %d, flushed %d",
2154 /* subclass can only do one of these, or semantics are too unclear */
2155 g_assert (*skip == 0 || *flushed == 0);
2157 /* track skipping */
2159 GstClockTime pts, dts;
2162 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", *skip);
2163 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2164 /* reverse playback, and no frames found yet, so we are skipping
2165 * the leading part of a fragment, which may form the tail of
2166 * fragment coming later, hopefully subclass skips efficiently ... */
2167 pts = gst_adapter_prev_pts (parse->priv->adapter, NULL);
2168 dts = gst_adapter_prev_dts (parse->priv->adapter, NULL);
2169 outbuf = gst_adapter_take_buffer (parse->priv->adapter, *skip);
2170 outbuf = gst_buffer_make_writable (outbuf);
2171 GST_BUFFER_PTS (outbuf) = pts;
2172 GST_BUFFER_DTS (outbuf) = dts;
2173 parse->priv->buffers_head =
2174 g_slist_prepend (parse->priv->buffers_head, outbuf);
2177 /* If we're asked to skip more than is available in the adapter,
2178 we need to remember what we need to skip for next iteration */
2179 gsize av = gst_adapter_available (parse->priv->adapter);
2180 GST_DEBUG ("Asked to skip %u (%" G_GSIZE_FORMAT " available)", *skip, av);
2182 gst_adapter_flush (parse->priv->adapter, *skip);
2185 ("This is more than available, flushing %" G_GSIZE_FORMAT
2186 ", storing %u to skip", av, (guint) (*skip - av));
2187 parse->priv->skip = *skip - av;
2188 gst_adapter_flush (parse->priv->adapter, av);
2192 if (!parse->priv->discont)
2193 parse->priv->sync_offset = parse->priv->offset;
2194 parse->priv->offset += *skip;
2195 parse->priv->discont = TRUE;
2196 /* check for indefinite skipping */
2197 if (ret == GST_FLOW_OK)
2198 ret = gst_base_parse_check_sync (parse);
2201 parse->priv->offset += *flushed;
2203 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
2204 gst_adapter_clear (parse->priv->adapter);
2207 if (*skip == 0 && *flushed == 0) {
2208 /* Carry over discont if we need more data */
2209 if (GST_BUFFER_IS_DISCONT (frame->buffer))
2210 parse->priv->discont = TRUE;
2213 gst_base_parse_frame_free (frame);
2218 /* gst_base_parse_push_pending_events:
2219 * @parse: #GstBaseParse
2221 * Pushes the pending events
2224 gst_base_parse_push_pending_events (GstBaseParse * parse)
2226 if (G_UNLIKELY (parse->priv->pending_events)) {
2227 GList *r = g_list_reverse (parse->priv->pending_events);
2230 parse->priv->pending_events = NULL;
2231 for (l = r; l != NULL; l = l->next) {
2232 gst_pad_push_event (parse->srcpad, GST_EVENT_CAST (l->data));
2238 /* gst_base_parse_handle_and_push_frame:
2239 * @parse: #GstBaseParse.
2240 * @klass: #GstBaseParseClass.
2241 * @frame: (transfer full): a #GstBaseParseFrame
2243 * Parses the frame from given buffer and pushes it forward. Also performs
2244 * timestamp handling and checks the segment limits.
2246 * This is called with srcpad STREAM_LOCK held.
2248 * Returns: #GstFlowReturn
2250 static GstFlowReturn
2251 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
2252 GstBaseParseFrame * frame)
2257 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2259 buffer = frame->buffer;
2260 offset = frame->offset;
2262 /* check if subclass/format can provide ts.
2263 * If so, that allows and enables extra seek and duration determining options */
2264 if (G_UNLIKELY (parse->priv->first_frame_offset < 0)) {
2265 if (GST_BUFFER_PTS_IS_VALID (buffer) && parse->priv->has_timing_info
2266 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
2267 parse->priv->first_frame_offset = offset;
2268 parse->priv->first_frame_pts = GST_BUFFER_PTS (buffer);
2269 parse->priv->first_frame_dts = GST_BUFFER_DTS (buffer);
2270 GST_DEBUG_OBJECT (parse, "subclass provided dts %" GST_TIME_FORMAT
2271 ", pts %" GST_TIME_FORMAT " for first frame at offset %"
2272 G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->first_frame_dts),
2273 GST_TIME_ARGS (parse->priv->first_frame_pts),
2274 parse->priv->first_frame_offset);
2275 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
2277 GstClockTime last_ts = G_MAXINT64;
2279 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
2280 gst_base_parse_locate_time (parse, &last_ts, &off);
2281 if (GST_CLOCK_TIME_IS_VALID (last_ts))
2282 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
2285 /* disable further checks */
2286 parse->priv->first_frame_offset = 0;
2290 /* track upstream time if provided, not subclass' internal notion of it */
2291 if (parse->priv->upstream_format == GST_FORMAT_TIME) {
2292 GST_BUFFER_PTS (frame->buffer) = GST_CLOCK_TIME_NONE;
2293 GST_BUFFER_DTS (frame->buffer) = GST_CLOCK_TIME_NONE;
2296 /* interpolating and no valid pts yet,
2297 * start with dts and carry on from there */
2298 if (parse->priv->infer_ts && parse->priv->pts_interpolate
2299 && !GST_CLOCK_TIME_IS_VALID (parse->priv->next_pts))
2300 parse->priv->next_pts = parse->priv->next_dts;
2302 /* again use default handler to add missing metadata;
2303 * we may have new information on frame properties */
2304 gst_base_parse_parse_frame (parse, frame);
2306 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
2307 if (GST_BUFFER_DTS_IS_VALID (buffer) && GST_BUFFER_DURATION_IS_VALID (buffer)) {
2308 parse->priv->next_dts =
2309 GST_BUFFER_DTS (buffer) + GST_BUFFER_DURATION (buffer);
2310 if (parse->priv->pts_interpolate && GST_BUFFER_PTS_IS_VALID (buffer)) {
2311 GstClockTime next_pts =
2312 GST_BUFFER_PTS (buffer) + GST_BUFFER_DURATION (buffer);
2313 if (next_pts >= parse->priv->next_dts)
2314 parse->priv->next_pts = next_pts;
2317 /* we lost track, do not produce bogus time next time around
2318 * (probably means parser subclass has given up on parsing as well) */
2319 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
2320 parse->priv->next_dts = GST_CLOCK_TIME_NONE;
2323 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
2324 GST_BUFFER_PTS_IS_VALID (buffer))
2325 gst_base_parse_add_index_entry (parse, offset,
2326 GST_BUFFER_PTS (buffer),
2327 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
2329 /* All OK, push queued frames if there are any */
2330 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
2331 GstBaseParseFrame *queued_frame;
2333 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
2334 gst_base_parse_push_frame (parse, queued_frame);
2335 gst_base_parse_frame_free (queued_frame);
2339 return gst_base_parse_push_frame (parse, frame);
2343 * gst_base_parse_push_frame:
2344 * @parse: #GstBaseParse.
2345 * @frame: (transfer none): a #GstBaseParseFrame
2347 * Pushes the frame's buffer downstream, sends any pending events and
2348 * does some timestamp and segment handling. Takes ownership of
2349 * frame's buffer, though caller retains ownership of @frame.
2351 * This must be called with sinkpad STREAM_LOCK held.
2353 * Returns: #GstFlowReturn
2356 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
2358 GstFlowReturn ret = GST_FLOW_OK;
2359 GstClockTime last_start = GST_CLOCK_TIME_NONE;
2360 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
2361 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
2365 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2366 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
2368 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
2370 buffer = frame->buffer;
2372 GST_LOG_OBJECT (parse,
2373 "processing buffer of size %" G_GSIZE_FORMAT " with dts %" GST_TIME_FORMAT
2374 ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
2375 gst_buffer_get_size (buffer),
2376 GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
2377 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
2378 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
2381 parse->priv->bytecount += frame->size;
2382 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
2383 parse->priv->framecount++;
2384 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
2385 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
2388 /* 0 means disabled */
2389 if (parse->priv->update_interval < 0)
2390 parse->priv->update_interval = 50;
2391 else if (parse->priv->update_interval > 0 &&
2392 (parse->priv->framecount % parse->priv->update_interval) == 0)
2393 gst_base_parse_update_duration (parse);
2395 if (GST_BUFFER_PTS_IS_VALID (buffer))
2396 last_start = last_stop = GST_BUFFER_PTS (buffer);
2397 if (last_start != GST_CLOCK_TIME_NONE
2398 && GST_BUFFER_DURATION_IS_VALID (buffer))
2399 last_stop = last_start + GST_BUFFER_DURATION (buffer);
2401 /* should have caps by now */
2402 if (!gst_pad_has_current_caps (parse->srcpad))
2405 if (G_UNLIKELY (!parse->priv->checked_media)) {
2406 /* have caps; check identity */
2407 gst_base_parse_check_media (parse);
2410 if (parse->priv->tags_changed) {
2411 gst_base_parse_queue_tag_event_update (parse);
2412 parse->priv->tags_changed = FALSE;
2415 /* Push pending events, including SEGMENT events */
2416 gst_base_parse_push_pending_events (parse);
2418 /* segment adjustment magic; only if we are running the whole show */
2419 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
2420 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
2421 parse->priv->upstream_seekable)) {
2423 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
2424 GST_CLOCK_TIME_IS_VALID (last_start)) {
2425 GstClockTimeDiff diff;
2427 /* only send newsegments with increasing start times,
2428 * otherwise if these go back and forth downstream (sinks) increase
2429 * accumulated time and running_time */
2430 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
2431 if (G_UNLIKELY (diff > 2 * GST_SECOND
2432 && last_start > parse->segment.start
2433 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
2434 || last_start < parse->segment.stop))) {
2436 GST_DEBUG_OBJECT (parse,
2437 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
2438 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
2439 "Sending updated SEGMENT events", diff,
2440 GST_TIME_ARGS (parse->segment.position),
2441 GST_TIME_ARGS (last_start));
2443 /* skip gap FIXME */
2444 gst_pad_push_event (parse->srcpad,
2445 gst_event_new_segment (&parse->segment));
2447 parse->segment.position = last_start;
2452 /* update bitrates and optionally post corresponding tags
2453 * (following newsegment) */
2454 gst_base_parse_update_bitrates (parse, frame);
2456 if (klass->pre_push_frame) {
2457 ret = klass->pre_push_frame (parse, frame);
2459 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
2462 /* Push pending events, if there are any new ones
2463 * like tags added by pre_push_frame */
2464 if (parse->priv->tags_changed) {
2465 gst_base_parse_queue_tag_event_update (parse);
2466 parse->priv->tags_changed = FALSE;
2468 gst_base_parse_push_pending_events (parse);
2470 /* take final ownership of frame buffer */
2471 if (frame->out_buffer) {
2472 buffer = frame->out_buffer;
2473 frame->out_buffer = NULL;
2474 gst_buffer_replace (&frame->buffer, NULL);
2476 buffer = frame->buffer;
2477 frame->buffer = NULL;
2480 /* subclass must play nice */
2481 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2483 size = gst_buffer_get_size (buffer);
2485 parse->priv->seen_keyframe |= parse->priv->is_video &&
2486 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
2488 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
2489 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2490 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
2491 GST_BUFFER_TIMESTAMP (buffer) >
2492 parse->segment.stop + parse->priv->lead_out_ts) {
2493 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
2495 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2496 GST_BUFFER_DURATION_IS_VALID (buffer) &&
2497 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
2498 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
2499 parse->priv->lead_in_ts < parse->segment.start) {
2500 if (parse->priv->seen_keyframe) {
2501 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
2504 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
2505 ret = GST_BASE_PARSE_FLOW_DROPPED;
2512 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2513 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2514 if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))
2515 parse->priv->discont = TRUE;
2516 gst_buffer_unref (buffer);
2518 } else if (ret == GST_FLOW_OK) {
2519 if (parse->segment.rate > 0.0) {
2520 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2522 ret = gst_pad_push (parse->srcpad, buffer);
2523 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2524 } else if (!parse->priv->disable_passthrough && parse->priv->passthrough) {
2526 /* in backwards playback mode, if on passthrough we need to push buffers
2527 * directly without accumulating them into the buffers_queued as baseparse
2528 * will never check for a DISCONT while on passthrough and those buffers
2529 * will never be pushed.
2531 * also, as we are on reverse playback, it might be possible that
2532 * passthrough might have just been enabled, so make sure to drain the
2533 * buffers_queued list */
2534 if (G_UNLIKELY (parse->priv->buffers_queued != NULL)) {
2535 gst_base_parse_finish_fragment (parse, TRUE);
2536 ret = gst_base_parse_send_buffers (parse);
2539 if (ret == GST_FLOW_OK) {
2540 GST_LOG_OBJECT (parse,
2541 "pushing frame (%" G_GSIZE_FORMAT " bytes) now..", size);
2542 ret = gst_pad_push (parse->srcpad, buffer);
2543 GST_LOG_OBJECT (parse, "frame pushed, flow %s",
2544 gst_flow_get_name (ret));
2546 GST_LOG_OBJECT (parse,
2547 "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s", size,
2548 gst_flow_get_name (ret));
2549 gst_buffer_unref (buffer);
2553 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2555 parse->priv->buffers_queued =
2556 g_slist_prepend (parse->priv->buffers_queued, buffer);
2560 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2561 size, gst_flow_get_name (ret));
2562 gst_buffer_unref (buffer);
2563 /* if we are not sufficiently in control, let upstream decide on EOS */
2564 if (ret == GST_FLOW_EOS && !parse->priv->disable_passthrough &&
2565 (parse->priv->passthrough ||
2566 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2567 !parse->priv->upstream_seekable)))
2571 /* Update current running segment position */
2572 if ((ret == GST_FLOW_OK || ret == GST_FLOW_NOT_LINKED)
2573 && last_stop != GST_CLOCK_TIME_NONE
2574 && parse->segment.position < last_stop)
2575 parse->segment.position = last_stop;
2582 if (GST_PAD_IS_FLUSHING (parse->srcpad))
2583 return GST_FLOW_FLUSHING;
2585 GST_ELEMENT_ERROR (parse, STREAM, DECODE, ("No caps set"), (NULL));
2586 return GST_FLOW_ERROR;
2591 * gst_base_parse_finish_frame:
2592 * @parse: a #GstBaseParse
2593 * @frame: a #GstBaseParseFrame
2594 * @size: consumed input data represented by frame
2596 * Collects parsed data and pushes this downstream.
2597 * Source pad caps must be set when this is called.
2599 * If @frame's out_buffer is set, that will be used as subsequent frame data.
2600 * Otherwise, @size samples will be taken from the input and used for output,
2601 * and the output's metadata (timestamps etc) will be taken as (optionally)
2602 * set by the subclass on @frame's (input) buffer (which is otherwise
2603 * ignored for any but the above purpose/information).
2605 * Note that the latter buffer is invalidated by this call, whereas the
2606 * caller retains ownership of @frame.
2608 * Returns: a #GstFlowReturn that should be escalated to caller (of caller)
2611 gst_base_parse_finish_frame (GstBaseParse * parse, GstBaseParseFrame * frame,
2614 GstFlowReturn ret = GST_FLOW_OK;
2616 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2617 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
2618 g_return_val_if_fail (size > 0 || frame->out_buffer, GST_FLOW_ERROR);
2619 g_return_val_if_fail (gst_adapter_available (parse->priv->adapter) >= size,
2622 GST_LOG_OBJECT (parse, "finished frame at offset %" G_GUINT64_FORMAT ", "
2623 "flushing size %d", frame->offset, size);
2625 /* some one-time start-up */
2626 if (G_UNLIKELY (parse->priv->framecount == 0)) {
2627 gst_base_parse_check_seekability (parse);
2628 gst_base_parse_check_upstream (parse);
2631 parse->priv->flushed += size;
2633 if (parse->priv->scanning && frame->buffer) {
2634 if (!parse->priv->scanned_frame) {
2635 parse->priv->scanned_frame = gst_base_parse_frame_copy (frame);
2640 /* either PUSH or PULL mode arranges for adapter data */
2641 /* ensure output buffer */
2642 if (!frame->out_buffer) {
2643 GstBuffer *src, *dest;
2645 frame->out_buffer = gst_adapter_take_buffer (parse->priv->adapter, size);
2646 dest = frame->out_buffer;
2647 src = frame->buffer;
2648 GST_BUFFER_PTS (dest) = GST_BUFFER_PTS (src);
2649 GST_BUFFER_DTS (dest) = GST_BUFFER_DTS (src);
2650 GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src);
2651 GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src);
2652 GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src);
2653 GST_MINI_OBJECT_FLAGS (dest) = GST_MINI_OBJECT_FLAGS (src);
2655 gst_adapter_flush (parse->priv->adapter, size);
2658 /* use as input for subsequent processing */
2659 gst_buffer_replace (&frame->buffer, frame->out_buffer);
2660 gst_buffer_unref (frame->out_buffer);
2661 frame->out_buffer = NULL;
2663 /* mark input size consumed */
2666 /* subclass might queue frames/data internally if it needs more
2667 * frames to decide on the format, or might request us to queue here. */
2668 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_DROP) {
2669 gst_buffer_replace (&frame->buffer, NULL);
2671 } else if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_QUEUE) {
2672 GstBaseParseFrame *copy;
2674 copy = gst_base_parse_frame_copy (frame);
2675 copy->flags &= ~GST_BASE_PARSE_FRAME_FLAG_QUEUE;
2676 gst_base_parse_queue_frame (parse, copy);
2680 ret = gst_base_parse_handle_and_push_frame (parse, frame);
2687 * gst_base_parse_drain:
2688 * @parse: a #GstBaseParse
2690 * Drains the adapter until it is empty. It decreases the min_frame_size to
2691 * match the current adapter size and calls chain method until the adapter
2692 * is emptied or chain returns with error.
2697 gst_base_parse_drain (GstBaseParse * parse)
2701 GST_DEBUG_OBJECT (parse, "draining");
2702 parse->priv->drain = TRUE;
2705 avail = gst_adapter_available (parse->priv->adapter);
2709 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2710 NULL) != GST_FLOW_OK) {
2714 /* nothing changed, maybe due to truncated frame; break infinite loop */
2715 if (avail == gst_adapter_available (parse->priv->adapter)) {
2716 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2717 gst_adapter_clear (parse->priv->adapter);
2721 parse->priv->drain = FALSE;
2724 /* gst_base_parse_send_buffers
2726 * Sends buffers collected in send_buffers downstream, and ensures that list
2727 * is empty at the end (errors or not).
2729 static GstFlowReturn
2730 gst_base_parse_send_buffers (GstBaseParse * parse)
2732 GSList *send = NULL;
2734 GstFlowReturn ret = GST_FLOW_OK;
2735 gboolean first = TRUE;
2737 send = parse->priv->buffers_send;
2741 buf = GST_BUFFER_CAST (send->data);
2742 GST_LOG_OBJECT (parse, "pushing buffer %p, dts %"
2743 GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2744 ", offset %" G_GINT64_FORMAT, buf,
2745 GST_TIME_ARGS (GST_BUFFER_DTS (buf)),
2746 GST_TIME_ARGS (GST_BUFFER_PTS (buf)),
2747 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2749 /* Make sure the first buffer is always DISCONT. If we split
2750 * GOPs inside the parser this is otherwise not guaranteed */
2752 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
2755 /* likewise, subsequent buffers should never have DISCONT
2756 * according to the "reverse fragment protocol", or such would
2757 * confuse a downstream decoder
2758 * (could be DISCONT due to aggregating upstream fragments by parsing) */
2759 GST_BUFFER_FLAG_UNSET (buf, GST_BUFFER_FLAG_DISCONT);
2762 /* iterate output queue an push downstream */
2763 ret = gst_pad_push (parse->srcpad, buf);
2764 send = g_slist_delete_link (send, send);
2766 /* clear any leftover if error */
2767 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2769 buf = GST_BUFFER_CAST (send->data);
2770 gst_buffer_unref (buf);
2771 send = g_slist_delete_link (send, send);
2776 parse->priv->buffers_send = send;
2781 /* gst_base_parse_start_fragment:
2783 * Prepares for processing a reverse playback (forward) fragment
2784 * by (re)setting proper state variables.
2786 static GstFlowReturn
2787 gst_base_parse_start_fragment (GstBaseParse * parse)
2789 GST_LOG_OBJECT (parse, "starting fragment");
2791 /* invalidate so no fall-back timestamping is performed;
2792 * ok if taken from subclass or upstream */
2793 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
2794 parse->priv->prev_pts = GST_CLOCK_TIME_NONE;
2795 parse->priv->next_dts = GST_CLOCK_TIME_NONE;
2796 parse->priv->prev_dts = GST_CLOCK_TIME_NONE;
2797 parse->priv->prev_dts_from_pts = FALSE;
2798 /* prevent it hanging around stop all the time */
2799 parse->segment.position = GST_CLOCK_TIME_NONE;
2801 parse->priv->discont = TRUE;
2803 /* head of previous fragment is now pending tail of current fragment */
2804 parse->priv->buffers_pending = parse->priv->buffers_head;
2805 parse->priv->buffers_head = NULL;
2811 /* gst_base_parse_finish_fragment:
2813 * Processes a reverse playback (forward) fragment:
2814 * - append head of last fragment that was skipped to current fragment data
2815 * - drain the resulting current fragment data (i.e. repeated chain)
2816 * - add time/duration (if needed) to frames queued by chain
2817 * - push queued data
2819 static GstFlowReturn
2820 gst_base_parse_finish_fragment (GstBaseParse * parse, gboolean prev_head)
2823 GstFlowReturn ret = GST_FLOW_OK;
2824 gboolean seen_key = FALSE, seen_delta = FALSE;
2826 GST_LOG_OBJECT (parse, "finishing fragment");
2829 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2830 while (parse->priv->buffers_pending) {
2831 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2833 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2834 gst_buffer_get_size (buf));
2835 gst_adapter_push (parse->priv->adapter, buf);
2837 GST_LOG_OBJECT (parse, "discarding head buffer");
2838 gst_buffer_unref (buf);
2840 parse->priv->buffers_pending =
2841 g_slist_delete_link (parse->priv->buffers_pending,
2842 parse->priv->buffers_pending);
2845 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2846 /* initial skipped data is added to buffers_pending */
2847 gst_base_parse_drain (parse);
2849 if (parse->priv->buffers_send) {
2850 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2851 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2854 /* add metadata (if needed to queued buffers */
2855 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2856 GST_TIME_ARGS (parse->priv->last_pts));
2857 while (parse->priv->buffers_queued) {
2858 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2860 /* no touching if upstream or parsing provided time */
2861 if (GST_BUFFER_PTS_IS_VALID (buf)) {
2862 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2863 GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
2864 } else if (GST_BUFFER_DURATION_IS_VALID (buf)) {
2865 if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_pts)) {
2866 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_pts))
2867 parse->priv->last_pts -= GST_BUFFER_DURATION (buf);
2869 parse->priv->last_pts = 0;
2870 GST_BUFFER_PTS (buf) = parse->priv->last_pts;
2871 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2872 GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
2874 if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_dts)) {
2875 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_dts))
2876 parse->priv->last_dts -= GST_BUFFER_DURATION (buf);
2878 parse->priv->last_dts = 0;
2879 GST_BUFFER_DTS (buf) = parse->priv->last_dts;
2880 GST_LOG_OBJECT (parse, "applied dts %" GST_TIME_FORMAT,
2881 GST_TIME_ARGS (GST_BUFFER_DTS (buf)));
2884 /* no idea, very bad */
2885 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2888 parse->priv->last_pts = GST_BUFFER_PTS (buf);
2889 parse->priv->last_dts = GST_BUFFER_DTS (buf);
2891 /* reverse order for ascending sending */
2892 /* send downstream at keyframe not preceded by a keyframe
2893 * (e.g. that should identify start of collection of IDR nals) */
2894 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2896 ret = gst_base_parse_send_buffers (parse);
2897 /* if a problem, throw all to sending */
2898 if (ret != GST_FLOW_OK) {
2899 parse->priv->buffers_send =
2900 g_slist_reverse (parse->priv->buffers_queued);
2901 parse->priv->buffers_queued = NULL;
2911 parse->priv->buffers_send =
2912 g_slist_prepend (parse->priv->buffers_send, buf);
2913 parse->priv->buffers_queued =
2914 g_slist_delete_link (parse->priv->buffers_queued,
2915 parse->priv->buffers_queued);
2918 /* audio may have all marked as keyframe, so arrange to send here. Also
2919 * we might have ended the loop above on a keyframe, in which case we
2921 if (!seen_delta || seen_key)
2922 ret = gst_base_parse_send_buffers (parse);
2924 /* any trailing unused no longer usable (ideally none) */
2925 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2926 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2927 gst_adapter_available (parse->priv->adapter));
2928 gst_adapter_clear (parse->priv->adapter);
2934 /* small helper that checks whether we have been trying to resync too long */
2935 static inline GstFlowReturn
2936 gst_base_parse_check_sync (GstBaseParse * parse)
2938 if (G_UNLIKELY (parse->priv->discont &&
2939 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2940 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2941 ("Failed to parse stream"), (NULL));
2942 return GST_FLOW_ERROR;
2948 static GstFlowReturn
2949 gst_base_parse_process_streamheader (GstBaseParse * parse)
2953 const GValue *value;
2954 GstFlowReturn ret = GST_FLOW_OK;
2956 caps = gst_pad_get_current_caps (GST_BASE_PARSE_SINK_PAD (parse));
2960 str = gst_caps_get_structure (caps, 0);
2961 value = gst_structure_get_value (str, "streamheader");
2965 GST_DEBUG_OBJECT (parse, "Found streamheader field on input caps");
2967 if (GST_VALUE_HOLDS_ARRAY (value)) {
2969 gsize len = gst_value_array_get_size (value);
2971 for (i = 0; i < len; i++) {
2973 gst_value_get_buffer (gst_value_array_get_value (value, i));
2975 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2976 GST_OBJECT_CAST (parse), gst_buffer_ref (buffer));
2979 } else if (GST_VALUE_HOLDS_BUFFER (value)) {
2980 GstBuffer *buffer = gst_value_get_buffer (value);
2982 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2983 GST_OBJECT_CAST (parse), gst_buffer_ref (buffer));
2986 gst_caps_unref (caps);
2993 gst_caps_unref (caps);
2996 GST_DEBUG_OBJECT (parse, "No streamheader on caps");
3001 static GstFlowReturn
3002 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
3004 GstBaseParseClass *bclass;
3005 GstBaseParse *parse;
3006 GstFlowReturn ret = GST_FLOW_OK;
3007 GstFlowReturn old_ret = GST_FLOW_OK;
3008 GstBuffer *tmpbuf = NULL;
3012 GstClockTime pts, dts;
3014 parse = GST_BASE_PARSE (parent);
3015 bclass = GST_BASE_PARSE_GET_CLASS (parse);
3016 GST_DEBUG_OBJECT (parent, "chain");
3018 /* early out for speed, if we need to skip */
3019 if (buffer && GST_BUFFER_IS_DISCONT (buffer))
3020 parse->priv->skip = 0;
3021 if (parse->priv->skip > 0) {
3022 gsize bsize = gst_buffer_get_size (buffer);
3023 GST_DEBUG ("Got %" G_GSIZE_FORMAT " buffer, need to skip %u", bsize,
3025 if (parse->priv->skip >= bsize) {
3026 parse->priv->skip -= bsize;
3027 GST_DEBUG ("All the buffer is skipped");
3028 parse->priv->offset += bsize;
3029 parse->priv->sync_offset = parse->priv->offset;
3032 buffer = gst_buffer_make_writable (buffer);
3033 gst_buffer_resize (buffer, parse->priv->skip, bsize - parse->priv->skip);
3034 parse->priv->offset += parse->priv->skip;
3035 GST_DEBUG ("Done skipping, we have %u left on this buffer",
3036 (unsigned) (bsize - parse->priv->skip));
3037 parse->priv->skip = 0;
3038 parse->priv->discont = TRUE;
3041 if (G_UNLIKELY (parse->priv->first_buffer)) {
3042 parse->priv->first_buffer = FALSE;
3043 if (!GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_HEADER)) {
3044 /* this stream has no header buffers, check if we just prepend the
3045 * streamheader from caps to the stream */
3046 GST_DEBUG_OBJECT (parse, "Looking for streamheader field on caps to "
3047 "prepend to the stream");
3048 gst_base_parse_process_streamheader (parse);
3050 GST_DEBUG_OBJECT (parse, "Stream has header buffers, not prepending "
3051 "streamheader from caps");
3055 if (parse->priv->detecting) {
3056 GstBuffer *detect_buf;
3058 if (parse->priv->detect_buffers_size == 0) {
3059 detect_buf = gst_buffer_ref (buffer);
3064 detect_buf = gst_buffer_new ();
3066 for (l = parse->priv->detect_buffers; l; l = l->next) {
3067 gsize tmpsize = gst_buffer_get_size (l->data);
3069 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
3070 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
3074 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
3075 offset, gst_buffer_get_size (buffer));
3078 ret = bclass->detect (parse, detect_buf);
3079 gst_buffer_unref (detect_buf);
3081 if (ret == GST_FLOW_OK) {
3084 /* Detected something */
3085 parse->priv->detecting = FALSE;
3087 for (l = parse->priv->detect_buffers; l; l = l->next) {
3088 if (ret == GST_FLOW_OK && !parse->priv->flushing)
3090 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
3091 parent, GST_BUFFER_CAST (l->data));
3093 gst_buffer_unref (GST_BUFFER_CAST (l->data));
3095 g_list_free (parse->priv->detect_buffers);
3096 parse->priv->detect_buffers = NULL;
3097 parse->priv->detect_buffers_size = 0;
3099 if (ret != GST_FLOW_OK) {
3103 /* Handle the current buffer */
3104 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
3105 /* Still detecting, append buffer or error out if draining */
3107 if (parse->priv->drain) {
3108 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
3109 return GST_FLOW_ERROR;
3110 } else if (parse->priv->flushing) {
3111 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
3113 g_list_free (parse->priv->detect_buffers);
3114 parse->priv->detect_buffers = NULL;
3115 parse->priv->detect_buffers_size = 0;
3117 parse->priv->detect_buffers =
3118 g_list_append (parse->priv->detect_buffers, buffer);
3119 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
3123 /* Something went wrong, subclass responsible for error reporting */
3127 /* And now handle the current buffer if detection worked */
3130 if (G_LIKELY (buffer)) {
3131 GST_LOG_OBJECT (parse,
3132 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT
3133 ", dts %" GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT,
3134 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer),
3135 GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
3136 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)));
3138 if (G_UNLIKELY (!parse->priv->disable_passthrough
3139 && parse->priv->passthrough)) {
3140 GstBaseParseFrame frame;
3142 gst_base_parse_frame_init (&frame);
3143 frame.buffer = gst_buffer_make_writable (buffer);
3144 ret = gst_base_parse_push_frame (parse, &frame);
3145 gst_base_parse_frame_free (&frame);
3148 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
3149 /* upstream feeding us in reverse playback;
3150 * finish previous fragment and start new upon DISCONT */
3151 if (parse->segment.rate < 0.0) {
3152 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
3153 ret = gst_base_parse_finish_fragment (parse, TRUE);
3154 gst_base_parse_start_fragment (parse);
3156 /* discont in the stream, drain and mark discont for next output */
3157 gst_base_parse_drain (parse);
3158 parse->priv->discont = TRUE;
3161 gst_adapter_push (parse->priv->adapter, buffer);
3164 /* Parse and push as many frames as possible */
3165 /* Stop either when adapter is empty or we are flushing */
3166 while (!parse->priv->flushing) {
3168 gboolean updated_prev_pts = FALSE;
3170 /* note: if subclass indicates MAX fsize,
3171 * this will not likely be available anyway ... */
3172 min_size = MAX (parse->priv->min_frame_size, fsize);
3173 av = gst_adapter_available (parse->priv->adapter);
3175 if (G_UNLIKELY (parse->priv->drain)) {
3177 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
3178 if (G_UNLIKELY (!min_size)) {
3183 /* Collect at least min_frame_size bytes */
3184 if (av < min_size) {
3185 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)", av);
3189 /* move along with upstream timestamp (if any),
3190 * but interpolate in between */
3191 pts = gst_adapter_prev_pts (parse->priv->adapter, NULL);
3192 dts = gst_adapter_prev_dts (parse->priv->adapter, NULL);
3193 if (GST_CLOCK_TIME_IS_VALID (pts) && (parse->priv->prev_pts != pts)) {
3194 parse->priv->prev_pts = parse->priv->next_pts = pts;
3195 updated_prev_pts = TRUE;
3198 if (GST_CLOCK_TIME_IS_VALID (dts) && (parse->priv->prev_dts != dts)) {
3199 parse->priv->prev_dts = parse->priv->next_dts = dts;
3200 parse->priv->prev_dts_from_pts = FALSE;
3203 /* we can mess with, erm interpolate, timestamps,
3204 * and incoming stuff has PTS but no DTS seen so far,
3205 * then pick up DTS from PTS and hope for the best ... */
3206 if (parse->priv->infer_ts &&
3207 parse->priv->pts_interpolate &&
3208 !GST_CLOCK_TIME_IS_VALID (dts) &&
3209 (!GST_CLOCK_TIME_IS_VALID (parse->priv->prev_dts)
3210 || (parse->priv->prev_dts_from_pts && updated_prev_pts))
3211 && GST_CLOCK_TIME_IS_VALID (pts)) {
3212 parse->priv->prev_dts = parse->priv->next_dts = pts;
3213 parse->priv->prev_dts_from_pts = TRUE;
3216 /* always pass all available data */
3217 tmpbuf = gst_adapter_get_buffer (parse->priv->adapter, av);
3219 /* already inform subclass what timestamps we have planned,
3220 * at least if provided by time-based upstream */
3221 if (parse->priv->upstream_format == GST_FORMAT_TIME) {
3222 tmpbuf = gst_buffer_make_writable (tmpbuf);
3223 GST_BUFFER_PTS (tmpbuf) = parse->priv->next_pts;
3224 GST_BUFFER_DTS (tmpbuf) = parse->priv->next_dts;
3225 GST_BUFFER_DURATION (tmpbuf) = GST_CLOCK_TIME_NONE;
3228 /* keep the adapter mapped, so keep track of what has to be flushed */
3229 ret = gst_base_parse_handle_buffer (parse, tmpbuf, &skip, &flush);
3232 if (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED) {
3235 if (skip == 0 && flush == 0) {
3236 GST_LOG_OBJECT (parse, "nothing skipped and no frames finished, "
3237 "breaking to get more data");
3238 /* ignore this return as it produced no data */
3242 if (old_ret == GST_FLOW_OK)
3247 GST_LOG_OBJECT (parse, "chain leaving");
3251 /* pull @size bytes at current offset,
3252 * i.e. at least try to and possibly return a shorter buffer if near the end */
3253 static GstFlowReturn
3254 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
3255 GstBuffer ** buffer)
3257 GstFlowReturn ret = GST_FLOW_OK;
3259 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
3261 /* Caching here actually makes much less difference than one would expect.
3262 * We do it mainly to avoid pulling buffers of 1 byte all the time */
3263 if (parse->priv->cache) {
3264 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
3265 gint cache_size = gst_buffer_get_size (parse->priv->cache);
3267 if (cache_offset <= parse->priv->offset &&
3268 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
3269 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
3270 parse->priv->offset - cache_offset, size);
3271 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
3274 /* not enough data in the cache, free cache and get a new one */
3275 gst_buffer_unref (parse->priv->cache);
3276 parse->priv->cache = NULL;
3279 /* refill the cache */
3281 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
3282 64 * 1024), &parse->priv->cache);
3283 if (ret != GST_FLOW_OK) {
3284 parse->priv->cache = NULL;
3288 if (gst_buffer_get_size (parse->priv->cache) >= size) {
3290 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
3292 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
3296 /* Not possible to get enough data, try a last time with
3297 * requesting exactly the size we need */
3298 gst_buffer_unref (parse->priv->cache);
3299 parse->priv->cache = NULL;
3301 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
3302 &parse->priv->cache);
3304 if (ret != GST_FLOW_OK) {
3305 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
3310 if (gst_buffer_get_size (parse->priv->cache) < size) {
3311 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
3312 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
3313 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
3315 *buffer = parse->priv->cache;
3316 parse->priv->cache = NULL;
3322 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
3323 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
3328 static GstFlowReturn
3329 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
3332 GstClockTime ts = 0;
3336 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
3337 ", last_offset = %" G_GINT64_FORMAT,
3338 GST_TIME_ARGS (parse->priv->last_pts), parse->priv->last_offset);
3340 if (!parse->priv->last_offset
3341 || parse->priv->last_pts <= parse->segment.start) {
3342 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
3343 GST_TIME_ARGS (parse->segment.start));
3348 /* last fragment started at last_offset / last_ts;
3349 * seek back 10s capped at 1MB */
3350 if (parse->priv->last_pts >= 10 * GST_SECOND)
3351 ts = parse->priv->last_pts - 10 * GST_SECOND;
3352 /* if we are exact now, we will be more so going backwards */
3353 if (parse->priv->exact_position) {
3354 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
3356 if (!gst_base_parse_convert (parse, GST_FORMAT_TIME, ts,
3357 GST_FORMAT_BYTES, &offset)) {
3358 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
3361 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
3362 parse->priv->last_offset - 1024);
3363 offset = MAX (0, offset);
3365 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
3367 parse->priv->offset = offset;
3369 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
3371 if (ret != GST_FLOW_OK)
3374 /* offset will increase again as fragment is processed/parsed */
3375 parse->priv->last_offset = offset;
3377 gst_base_parse_start_fragment (parse);
3378 gst_adapter_push (parse->priv->adapter, buffer);
3379 ret = gst_base_parse_finish_fragment (parse, TRUE);
3380 if (ret != GST_FLOW_OK)
3383 /* force previous fragment */
3384 parse->priv->offset = -1;
3391 * pull and scan for next frame starting from current offset
3392 * ajusts sync, drain and offset going along */
3393 static GstFlowReturn
3394 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass)
3397 GstFlowReturn ret = GST_FLOW_OK;
3398 guint fsize, min_size;
3402 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
3403 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
3405 /* let's make this efficient for all subclass once and for all;
3406 * maybe it does not need this much, but in the latter case, we know we are
3407 * in pull mode here and might as well try to read and supply more anyway
3408 * (so does the buffer caching mechanism) */
3412 min_size = MAX (parse->priv->min_frame_size, fsize);
3414 GST_LOG_OBJECT (parse, "reading buffer size %u", min_size);
3416 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
3417 if (ret != GST_FLOW_OK)
3420 /* if we got a short read, inform subclass we are draining leftover
3421 * and no more is to be expected */
3422 if (gst_buffer_get_size (buffer) < min_size) {
3423 GST_LOG_OBJECT (parse, "... but did not get that; marked draining");
3424 parse->priv->drain = TRUE;
3427 if (parse->priv->detecting) {
3428 ret = klass->detect (parse, buffer);
3429 if (ret == GST_FLOW_NOT_NEGOTIATED) {
3430 /* If draining we error out, otherwise request a buffer
3432 if (parse->priv->drain) {
3433 gst_buffer_unref (buffer);
3434 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
3435 return GST_FLOW_ERROR;
3438 gst_buffer_unref (buffer);
3441 } else if (ret != GST_FLOW_OK) {
3442 gst_buffer_unref (buffer);
3443 GST_ERROR_OBJECT (parse, "detect() returned %s",
3444 gst_flow_get_name (ret));
3448 /* Else handle this buffer normally */
3451 ret = gst_base_parse_handle_buffer (parse, buffer, &skip, &flushed);
3452 if (ret != GST_FLOW_OK)
3455 /* If a large amount of data was requested to be skipped, _handle_buffer
3456 might have set the priv->skip flag to an extra amount on top of skip.
3457 In pull mode, we can just pull from the new offset directly. */
3458 parse->priv->offset += parse->priv->skip;
3459 parse->priv->skip = 0;
3461 /* something flushed means something happened,
3462 * and we should bail out of this loop so as not to occupy
3463 * the task thread indefinitely */
3465 GST_LOG_OBJECT (parse, "frame finished, breaking loop");
3468 /* nothing flushed, no skip and draining, so nothing left to do */
3469 if (!skip && parse->priv->drain) {
3470 GST_LOG_OBJECT (parse, "no activity or result when draining; "
3471 "breaking loop and marking EOS");
3475 /* otherwise, get some more data
3476 * note that is checked this does not happen indefinitely */
3478 GST_LOG_OBJECT (parse, "getting some more data");
3481 parse->priv->drain = FALSE;
3488 /* Loop that is used in pull mode to retrieve data from upstream */
3490 gst_base_parse_loop (GstPad * pad)
3492 GstBaseParse *parse;
3493 GstBaseParseClass *klass;
3494 GstFlowReturn ret = GST_FLOW_OK;
3496 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
3497 klass = GST_BASE_PARSE_GET_CLASS (parse);
3499 GST_LOG_OBJECT (parse, "Entering parse loop");
3501 if (G_UNLIKELY (parse->priv->push_stream_start)) {
3506 gst_pad_create_stream_id (parse->srcpad, GST_ELEMENT_CAST (parse),
3509 event = gst_event_new_stream_start (stream_id);
3510 gst_event_set_group_id (event, gst_util_group_id_next ());
3512 GST_DEBUG_OBJECT (parse, "Pushing STREAM_START");
3513 gst_pad_push_event (parse->srcpad, event);
3514 parse->priv->push_stream_start = FALSE;
3518 /* reverse playback:
3519 * first fragment (closest to stop time) is handled normally below,
3520 * then we pull in fragments going backwards */
3521 if (parse->segment.rate < 0.0) {
3522 /* check if we jumped back to a previous fragment,
3523 * which is a post-first fragment */
3524 if (parse->priv->offset < 0) {
3525 ret = gst_base_parse_handle_previous_fragment (parse);
3530 ret = gst_base_parse_scan_frame (parse, klass);
3532 /* eat expected eos signalling past segment in reverse playback */
3533 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
3534 parse->segment.position >= parse->segment.stop) {
3535 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
3536 /* push what was accumulated during loop run */
3537 gst_base_parse_finish_fragment (parse, FALSE);
3538 /* force previous fragment */
3539 parse->priv->offset = -1;
3543 if (ret != GST_FLOW_OK)
3547 if (ret == GST_FLOW_EOS)
3549 else if (ret != GST_FLOW_OK)
3552 gst_object_unref (parse);
3559 GST_DEBUG_OBJECT (parse, "eos");
3564 gboolean push_eos = FALSE;
3566 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
3567 gst_flow_get_name (ret));
3568 gst_pad_pause_task (parse->sinkpad);
3570 if (ret == GST_FLOW_EOS) {
3571 /* handle end-of-stream/segment */
3572 if (parse->segment.flags & GST_SEGMENT_FLAG_SEGMENT) {
3575 if ((stop = parse->segment.stop) == -1)
3576 stop = parse->segment.duration;
3578 GST_DEBUG_OBJECT (parse, "sending segment_done");
3580 gst_element_post_message
3581 (GST_ELEMENT_CAST (parse),
3582 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
3583 GST_FORMAT_TIME, stop));
3584 gst_pad_push_event (parse->srcpad,
3585 gst_event_new_segment_done (GST_FORMAT_TIME, stop));
3587 /* If we STILL have zero frames processed, fire an error */
3588 if (parse->priv->framecount == 0) {
3589 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
3590 ("No valid frames found before end of stream"), (NULL));
3594 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
3595 /* for fatal errors we post an error message, wrong-state is
3596 * not fatal because it happens due to flushes and only means
3597 * that we should stop now. */
3598 GST_ELEMENT_FLOW_ERROR (parse, ret);
3602 if (parse->priv->estimated_duration <= 0) {
3603 gst_base_parse_update_duration (parse);
3605 /* Push pending events, including SEGMENT events */
3606 gst_base_parse_push_pending_events (parse);
3608 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
3610 gst_object_unref (parse);
3615 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
3617 GstSchedulingFlags sched_flags;
3618 GstBaseParse *parse;
3622 parse = GST_BASE_PARSE (parent);
3624 GST_DEBUG_OBJECT (parse, "sink activate");
3626 query = gst_query_new_scheduling ();
3627 if (!gst_pad_peer_query (sinkpad, query)) {
3628 gst_query_unref (query);
3629 goto baseparse_push;
3632 gst_query_parse_scheduling (query, &sched_flags, NULL, NULL, NULL);
3634 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL)
3635 && ((sched_flags & GST_SCHEDULING_FLAG_SEEKABLE) != 0);
3637 gst_query_unref (query);
3640 goto baseparse_push;
3642 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
3643 if (!gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE))
3644 goto baseparse_push;
3646 parse->priv->push_stream_start = TRUE;
3647 /* In pull mode, upstream is BYTES */
3648 parse->priv->upstream_format = GST_FORMAT_BYTES;
3650 return gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop,
3655 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
3656 return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
3661 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
3663 GstBaseParseClass *klass;
3664 gboolean result = TRUE;
3666 GST_DEBUG_OBJECT (parse, "activate %d", active);
3668 klass = GST_BASE_PARSE_GET_CLASS (parse);
3671 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
3672 result = klass->start (parse);
3674 /* If the subclass implements ::detect we want to
3675 * call it for the first buffers now */
3676 parse->priv->detecting = (klass->detect != NULL);
3678 /* We must make sure streaming has finished before resetting things
3679 * and calling the ::stop vfunc */
3680 GST_PAD_STREAM_LOCK (parse->sinkpad);
3681 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3683 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
3684 result = klass->stop (parse);
3686 parse->priv->pad_mode = GST_PAD_MODE_NONE;
3687 parse->priv->upstream_format = GST_FORMAT_UNDEFINED;
3689 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
3694 gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
3695 GstPadMode mode, gboolean active)
3698 GstBaseParse *parse;
3700 parse = GST_BASE_PARSE (parent);
3702 GST_DEBUG_OBJECT (parse, "sink %sactivate in %s mode",
3703 (active) ? "" : "de", gst_pad_mode_get_name (mode));
3705 if (!gst_base_parse_activate (parse, active))
3706 goto activate_failed;
3709 case GST_PAD_MODE_PULL:
3711 parse->priv->pending_events =
3712 g_list_prepend (parse->priv->pending_events,
3713 gst_event_new_segment (&parse->segment));
3716 result = gst_pad_stop_task (pad);
3724 parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
3726 GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
3733 GST_DEBUG_OBJECT (parse, "activate failed");
3739 * gst_base_parse_set_duration:
3740 * @parse: #GstBaseParse.
3742 * @duration: duration value.
3743 * @interval: how often to update the duration estimate based on bitrate, or 0.
3745 * Sets the duration of the currently playing media. Subclass can use this
3746 * when it is able to determine duration and/or notices a change in the media
3747 * duration. Alternatively, if @interval is non-zero (default), then stream
3748 * duration is determined based on estimated bitrate, and updated every @interval
3752 gst_base_parse_set_duration (GstBaseParse * parse,
3753 GstFormat fmt, gint64 duration, gint interval)
3755 g_return_if_fail (parse != NULL);
3757 if (parse->priv->upstream_has_duration) {
3758 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3762 if (duration != parse->priv->duration) {
3765 m = gst_message_new_duration_changed (GST_OBJECT (parse));
3766 gst_element_post_message (GST_ELEMENT (parse), m);
3768 /* TODO: what about duration tag? */
3770 parse->priv->duration = duration;
3771 parse->priv->duration_fmt = fmt;
3772 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3773 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3774 if (interval != 0) {
3775 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3779 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3780 parse->priv->update_interval = interval;
3786 * gst_base_parse_set_average_bitrate:
3787 * @parse: #GstBaseParse.
3788 * @bitrate: average bitrate in bits/second
3790 * Optionally sets the average bitrate detected in media (if non-zero),
3791 * e.g. based on metadata, as it will be posted to the application.
3793 * By default, announced average bitrate is estimated. The average bitrate
3794 * is used to estimate the total duration of the stream and to estimate
3795 * a seek position, if there's no index and the format is syncable
3796 * (see gst_base_parse_set_syncable()).
3799 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3801 parse->priv->bitrate = bitrate;
3802 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3806 * gst_base_parse_set_min_frame_size:
3807 * @parse: #GstBaseParse.
3808 * @min_size: Minimum size of the data that this base class should give to
3811 * Subclass can use this function to tell the base class that it needs to
3812 * give at least #min_size buffers.
3815 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3817 g_return_if_fail (parse != NULL);
3819 parse->priv->min_frame_size = min_size;
3820 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3824 * gst_base_parse_set_frame_rate:
3825 * @parse: the #GstBaseParse to set
3826 * @fps_num: frames per second (numerator).
3827 * @fps_den: frames per second (denominator).
3828 * @lead_in: frames needed before a segment for subsequent decode
3829 * @lead_out: frames needed after a segment
3831 * If frames per second is configured, parser can take care of buffer duration
3832 * and timestamping. When performing segment clipping, or seeking to a specific
3833 * location, a corresponding decoder might need an initial @lead_in and a
3834 * following @lead_out number of frames to ensure the desired segment is
3835 * entirely filled upon decoding.
3838 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3839 guint fps_den, guint lead_in, guint lead_out)
3841 g_return_if_fail (parse != NULL);
3843 parse->priv->fps_num = fps_num;
3844 parse->priv->fps_den = fps_den;
3845 if (!fps_num || !fps_den) {
3846 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3848 fps_num = fps_den = 0;
3849 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3850 parse->priv->lead_in = parse->priv->lead_out = 0;
3851 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3853 parse->priv->frame_duration =
3854 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3855 parse->priv->lead_in = lead_in;
3856 parse->priv->lead_out = lead_out;
3857 parse->priv->lead_in_ts =
3858 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3859 parse->priv->lead_out_ts =
3860 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3861 /* aim for about 1.5s to estimate duration */
3862 if (parse->priv->update_interval < 0) {
3863 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3864 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3865 parse->priv->update_interval);
3868 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3869 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3870 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3871 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3872 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3873 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3877 * gst_base_parse_set_has_timing_info:
3878 * @parse: a #GstBaseParse
3879 * @has_timing: whether frames carry timing information
3881 * Set if frames carry timing information which the subclass can (generally)
3882 * parse and provide. In particular, intrinsic (rather than estimated) time
3883 * can be obtained following a seek.
3886 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3888 parse->priv->has_timing_info = has_timing;
3889 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3893 * gst_base_parse_set_syncable:
3894 * @parse: a #GstBaseParse
3895 * @syncable: set if frame starts can be identified
3897 * Set if frame starts can be identified. This is set by default and
3898 * determines whether seeking based on bitrate averages
3899 * is possible for a format/stream.
3902 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3904 parse->priv->syncable = syncable;
3905 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3909 * gst_base_parse_set_passthrough:
3910 * @parse: a #GstBaseParse
3911 * @passthrough: %TRUE if parser should run in passthrough mode
3913 * Set if the nature of the format or configuration does not allow (much)
3914 * parsing, and the parser should operate in passthrough mode (which only
3915 * applies when operating in push mode). That is, incoming buffers are
3916 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3917 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3918 * so subclass can perform as much or as little is appropriate for
3919 * passthrough semantics in @pre_push_frame.
3922 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3924 parse->priv->passthrough = passthrough;
3925 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3929 * gst_base_parse_set_pts_interpolation:
3930 * @parse: a #GstBaseParse
3931 * @pts_interpolate: %TRUE if parser should interpolate PTS timestamps
3933 * By default, the base class will guess PTS timestamps using a simple
3934 * interpolation (previous timestamp + duration), which is incorrect for
3935 * data streams with reordering, where PTS can go backward. Sub-classes
3936 * implementing such formats should disable PTS interpolation.
3939 gst_base_parse_set_pts_interpolation (GstBaseParse * parse,
3940 gboolean pts_interpolate)
3942 parse->priv->pts_interpolate = pts_interpolate;
3943 GST_INFO_OBJECT (parse, "PTS interpolation: %s",
3944 (pts_interpolate) ? "yes" : "no");
3948 * gst_base_parse_set_infer_ts:
3949 * @parse: a #GstBaseParse
3950 * @infer_ts: %TRUE if parser should infer DTS/PTS from each other
3952 * By default, the base class might try to infer PTS from DTS and vice
3953 * versa. While this is generally correct for audio data, it may not
3954 * be otherwise. Sub-classes implementing such formats should disable
3955 * timestamp inferring.
3958 gst_base_parse_set_infer_ts (GstBaseParse * parse, gboolean infer_ts)
3960 parse->priv->infer_ts = infer_ts;
3961 GST_INFO_OBJECT (parse, "TS inferring: %s", (infer_ts) ? "yes" : "no");
3965 * gst_base_parse_set_latency:
3966 * @parse: a #GstBaseParse
3967 * @min_latency: minimum parse latency
3968 * @max_latency: maximum parse latency
3970 * Sets the minimum and maximum (which may likely be equal) latency introduced
3971 * by the parsing process. If there is such a latency, which depends on the
3972 * particular parsing of the format, it typically corresponds to 1 frame duration.
3975 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3976 GstClockTime max_latency)
3978 g_return_if_fail (min_latency != GST_CLOCK_TIME_NONE);
3979 g_return_if_fail (min_latency <= max_latency);
3981 GST_OBJECT_LOCK (parse);
3982 parse->priv->min_latency = min_latency;
3983 parse->priv->max_latency = max_latency;
3984 GST_OBJECT_UNLOCK (parse);
3985 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3986 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3987 GST_TIME_ARGS (max_latency));
3991 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3992 GstClockTime * duration)
3994 gboolean res = FALSE;
3996 g_return_val_if_fail (duration != NULL, FALSE);
3998 *duration = GST_CLOCK_TIME_NONE;
3999 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
4000 GST_LOG_OBJECT (parse, "using provided duration");
4001 *duration = parse->priv->duration;
4003 } else if (parse->priv->duration != -1) {
4004 GST_LOG_OBJECT (parse, "converting provided duration");
4005 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
4006 parse->priv->duration, format, (gint64 *) duration);
4007 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
4008 GST_LOG_OBJECT (parse, "using estimated duration");
4009 *duration = parse->priv->estimated_duration;
4012 GST_LOG_OBJECT (parse, "cannot estimate duration");
4015 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
4016 GST_TIME_ARGS (*duration));
4021 gst_base_parse_src_query_default (GstBaseParse * parse, GstQuery * query)
4023 gboolean res = FALSE;
4026 pad = GST_BASE_PARSE_SRC_PAD (parse);
4028 switch (GST_QUERY_TYPE (query)) {
4029 case GST_QUERY_POSITION:
4034 GST_DEBUG_OBJECT (parse, "position query");
4035 gst_query_parse_position (query, &format, NULL);
4037 /* try upstream first */
4038 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
4040 /* Fall back on interpreting segment */
4041 GST_OBJECT_LOCK (parse);
4042 /* Only reply BYTES if upstream is in BYTES already, otherwise
4043 * we're not in charge */
4044 if (format == GST_FORMAT_BYTES
4045 && parse->priv->upstream_format == GST_FORMAT_BYTES) {
4046 dest_value = parse->priv->offset;
4048 } else if (format == parse->segment.format &&
4049 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
4050 dest_value = gst_segment_to_stream_time (&parse->segment,
4051 parse->segment.format, parse->segment.position);
4054 GST_OBJECT_UNLOCK (parse);
4055 if (!res && parse->priv->upstream_format == GST_FORMAT_BYTES) {
4056 /* no precise result, upstream no idea either, then best estimate */
4057 /* priv->offset is updated in both PUSH/PULL modes, *iff* we're
4058 * in charge of things */
4059 res = gst_base_parse_convert (parse,
4060 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
4063 gst_query_set_position (query, format, dest_value);
4067 case GST_QUERY_DURATION:
4070 GstClockTime duration;
4072 GST_DEBUG_OBJECT (parse, "duration query");
4073 gst_query_parse_duration (query, &format, NULL);
4075 /* consult upstream */
4076 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
4078 /* otherwise best estimate from us */
4080 res = gst_base_parse_get_duration (parse, format, &duration);
4082 gst_query_set_duration (query, format, duration);
4086 case GST_QUERY_SEEKING:
4089 GstClockTime duration = GST_CLOCK_TIME_NONE;
4090 gboolean seekable = FALSE;
4092 GST_DEBUG_OBJECT (parse, "seeking query");
4093 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
4095 /* consult upstream */
4096 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
4098 /* we may be able to help if in TIME */
4099 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
4100 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
4101 /* already OK if upstream takes care */
4102 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
4104 if (!(res && seekable)) {
4105 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
4106 || duration == -1) {
4107 /* seekable if we still have a chance to get duration later on */
4108 seekable = parse->priv->upstream_seekable &&
4109 (parse->priv->update_interval > 0);
4111 seekable = parse->priv->upstream_seekable;
4112 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
4115 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
4121 case GST_QUERY_FORMATS:
4122 gst_query_set_formatsv (query, 3, fmtlist);
4125 case GST_QUERY_CONVERT:
4127 GstFormat src_format, dest_format;
4128 gint64 src_value, dest_value;
4130 gst_query_parse_convert (query, &src_format, &src_value,
4131 &dest_format, &dest_value);
4133 res = gst_base_parse_convert (parse, src_format, src_value,
4134 dest_format, &dest_value);
4136 gst_query_set_convert (query, src_format, src_value,
4137 dest_format, dest_value);
4141 case GST_QUERY_LATENCY:
4143 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
4145 GstClockTime min_latency, max_latency;
4147 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
4148 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
4149 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
4150 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
4152 GST_OBJECT_LOCK (parse);
4153 /* add our latency */
4154 min_latency += parse->priv->min_latency;
4155 if (max_latency == -1 || parse->priv->max_latency == -1)
4158 max_latency += parse->priv->max_latency;
4159 GST_OBJECT_UNLOCK (parse);
4161 gst_query_set_latency (query, live, min_latency, max_latency);
4165 case GST_QUERY_SEGMENT:
4170 format = parse->segment.format;
4173 gst_segment_to_stream_time (&parse->segment, format,
4174 parse->segment.start);
4175 if ((stop = parse->segment.stop) == -1)
4176 stop = parse->segment.duration;
4178 stop = gst_segment_to_stream_time (&parse->segment, format, stop);
4180 gst_query_set_segment (query, parse->segment.rate, format, start, stop);
4185 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
4191 /* scans for a cluster start from @pos,
4192 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
4193 static GstFlowReturn
4194 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
4195 GstClockTime * time, GstClockTime * duration)
4197 GstBaseParseClass *klass;
4199 gboolean orig_drain, orig_discont;
4200 GstFlowReturn ret = GST_FLOW_OK;
4201 GstBuffer *buf = NULL;
4202 GstBaseParseFrame *sframe = NULL;
4204 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
4205 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
4206 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
4208 klass = GST_BASE_PARSE_GET_CLASS (parse);
4210 *time = GST_CLOCK_TIME_NONE;
4211 *duration = GST_CLOCK_TIME_NONE;
4214 orig_offset = parse->priv->offset;
4215 orig_discont = parse->priv->discont;
4216 orig_drain = parse->priv->drain;
4218 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
4219 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
4221 /* jump elsewhere and locate next frame */
4222 parse->priv->offset = *pos;
4223 /* mark as scanning so frames don't get processed all the way */
4224 parse->priv->scanning = TRUE;
4225 ret = gst_base_parse_scan_frame (parse, klass);
4226 parse->priv->scanning = FALSE;
4227 /* retrieve frame found during scan */
4228 sframe = parse->priv->scanned_frame;
4229 parse->priv->scanned_frame = NULL;
4231 if (ret != GST_FLOW_OK || !sframe)
4234 /* get offset first, subclass parsing might dump other stuff in there */
4235 *pos = sframe->offset;
4236 buf = sframe->buffer;
4239 /* but it should provide proper time */
4240 *time = GST_BUFFER_TIMESTAMP (buf);
4241 *duration = GST_BUFFER_DURATION (buf);
4243 GST_LOG_OBJECT (parse,
4244 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
4245 GST_TIME_ARGS (*time), *pos);
4249 gst_base_parse_frame_free (sframe);
4252 parse->priv->offset = orig_offset;
4253 parse->priv->discont = orig_discont;
4254 parse->priv->drain = orig_drain;
4259 /* bisect and scan through file for frame starting before @time,
4260 * returns OK and @time/@offset if found, NONE and/or error otherwise
4261 * If @time == G_MAXINT64, scan for duration ( == last frame) */
4262 static GstFlowReturn
4263 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
4266 GstFlowReturn ret = GST_FLOW_OK;
4267 gint64 lpos, hpos, newpos;
4268 GstClockTime time, ltime, htime, newtime, dur;
4269 gboolean cont = TRUE;
4270 const GstClockTime tolerance = TARGET_DIFFERENCE;
4271 const guint chunk = 4 * 1024;
4273 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
4274 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
4276 GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
4277 GST_TIME_ARGS (*_time));
4279 /* TODO also make keyframe aware if useful some day */
4294 /* do not know at first */
4296 *_time = GST_CLOCK_TIME_NONE;
4298 /* need initial positions; start and end */
4299 lpos = parse->priv->first_frame_offset;
4300 ltime = parse->priv->first_frame_pts;
4301 /* try other one if no luck */
4302 if (!GST_CLOCK_TIME_IS_VALID (ltime))
4303 ltime = parse->priv->first_frame_dts;
4304 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
4305 GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
4306 return GST_FLOW_ERROR;
4308 hpos = parse->priv->upstream_size;
4310 GST_DEBUG_OBJECT (parse,
4311 "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
4312 ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, hpos,
4313 GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
4315 /* check preconditions are satisfied;
4316 * start and end are needed, except for special case where we scan for
4317 * last frame to determine duration */
4318 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
4319 !GST_CLOCK_TIME_IS_VALID (ltime) ||
4320 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
4324 /* shortcut cases */
4327 } else if (time < ltime + tolerance) {
4331 } else if (time >= htime) {
4337 while (htime > ltime && cont) {
4338 GST_LOG_OBJECT (parse,
4339 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
4340 GST_TIME_ARGS (ltime));
4341 GST_LOG_OBJECT (parse,
4342 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
4343 GST_TIME_ARGS (htime));
4344 if (G_UNLIKELY (time == G_MAXINT64)) {
4346 } else if (G_LIKELY (hpos > lpos)) {
4348 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
4351 /* should mean lpos == hpos, since lpos <= hpos is invariant */
4353 /* we check this case once, but not forever, so break loop */
4358 newpos = CLAMP (newpos, lpos, hpos);
4359 GST_LOG_OBJECT (parse,
4360 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
4361 GST_TIME_ARGS (time), newpos);
4363 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
4364 if (ret == GST_FLOW_EOS) {
4365 /* heuristic HACK */
4366 hpos = MAX (lpos, hpos - chunk);
4368 } else if (ret != GST_FLOW_OK) {
4372 if (newtime == -1 || newpos == -1) {
4373 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
4377 if (G_UNLIKELY (time == G_MAXINT64)) {
4380 if (GST_CLOCK_TIME_IS_VALID (dur))
4383 } else if (newtime > time) {
4385 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
4387 } else if (newtime + tolerance > time) {
4388 /* close enough undershoot */
4392 } else if (newtime < ltime) {
4393 /* so a position beyond lpos resulted in earlier time than ltime ... */
4394 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
4397 /* undershoot too far */
4398 newpos += newpos == lpos ? chunk : 0;
4399 lpos = CLAMP (newpos, lpos, hpos);
4405 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
4406 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
4411 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
4412 gboolean before, GstClockTime * _ts)
4414 gint64 bytes = 0, ts = 0;
4415 GstIndexEntry *entry = NULL;
4417 if (time == GST_CLOCK_TIME_NONE) {
4423 GST_BASE_PARSE_INDEX_LOCK (parse);
4424 if (parse->priv->index) {
4425 /* Let's check if we have an index entry for that time */
4426 entry = gst_index_get_assoc_entry (parse->priv->index,
4427 parse->priv->index_id,
4428 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
4429 GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
4433 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
4434 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
4436 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
4437 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
4438 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
4440 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
4441 GST_TIME_ARGS (time));
4444 ts = GST_CLOCK_TIME_NONE;
4447 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4456 /* returns TRUE if seek succeeded */
4458 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
4463 GstSeekType start_type = GST_SEEK_TYPE_NONE, stop_type;
4464 gboolean flush, update, res = TRUE, accurate;
4465 gint64 start, stop, seekpos, seekstop;
4466 GstSegment seeksegment = { 0, };
4467 GstClockTime start_ts;
4469 GstEvent *segment_event;
4471 /* try upstream first, unless we're driving the streaming thread ourselves */
4472 if (parse->priv->pad_mode != GST_PAD_MODE_PULL) {
4473 res = gst_pad_push_event (parse->sinkpad, gst_event_ref (event));
4478 gst_event_parse_seek (event, &rate, &format, &flags,
4479 &start_type, &start, &stop_type, &stop);
4480 seqnum = gst_event_get_seqnum (event);
4482 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
4483 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
4484 GST_TIME_FORMAT, gst_format_get_name (format), rate,
4485 start_type, GST_TIME_ARGS (start), stop_type, GST_TIME_ARGS (stop));
4487 /* we can only handle TIME, so check if subclass can convert
4488 * to TIME format if it's some other format (such as DEFAULT) */
4489 if (format != GST_FORMAT_TIME) {
4490 if (!gst_base_parse_convert (parse, format, start, GST_FORMAT_TIME, &start)
4491 || !gst_base_parse_convert (parse, format, stop, GST_FORMAT_TIME,
4493 goto no_convert_to_time;
4495 GST_INFO_OBJECT (parse, "converted %s format to start time "
4496 "%" GST_TIME_FORMAT " and stop time %" GST_TIME_FORMAT,
4497 gst_format_get_name (format), GST_TIME_ARGS (start),
4498 GST_TIME_ARGS (stop));
4500 format = GST_FORMAT_TIME;
4503 /* no negative rates in push mode (unless upstream takes care of that, but
4504 * we've already tried upstream and it didn't handle the seek request) */
4505 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
4508 if (start_type != GST_SEEK_TYPE_SET ||
4509 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
4512 /* get flush flag */
4513 flush = flags & GST_SEEK_FLAG_FLUSH;
4515 /* copy segment, we need this because we still need the old
4516 * segment when we close the current segment. */
4517 gst_segment_copy_into (&parse->segment, &seeksegment);
4519 GST_DEBUG_OBJECT (parse, "configuring seek");
4520 gst_segment_do_seek (&seeksegment, rate, format, flags,
4521 start_type, start, stop_type, stop, &update);
4523 /* accurate seeking implies seek tables are used to obtain position,
4524 * and the requested segment is maintained exactly, not adjusted any way */
4525 accurate = flags & GST_SEEK_FLAG_ACCURATE;
4527 /* maybe we can be accurate for (almost) free */
4528 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
4529 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
4530 GST_DEBUG_OBJECT (parse, "accurate seek possible");
4535 GstClockTime startpos;
4537 startpos = seeksegment.position;
4541 /* accurate requested, so ... seek a bit before target */
4542 if (startpos < parse->priv->lead_in_ts)
4545 startpos -= parse->priv->lead_in_ts;
4547 if (seeksegment.stop == -1 && seeksegment.duration != -1)
4548 seeksegment.stop = seeksegment.start + seeksegment.duration;
4550 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
4551 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
4555 start_ts = seeksegment.position;
4559 if (seeksegment.stop == -1 && seeksegment.duration != -1)
4560 seeksegment.stop = seeksegment.start + seeksegment.duration;
4562 if (!gst_base_parse_convert (parse, format, start_ts,
4563 GST_FORMAT_BYTES, &seekpos))
4564 goto convert_failed;
4565 if (!gst_base_parse_convert (parse, format, seeksegment.stop,
4566 GST_FORMAT_BYTES, &seekstop))
4567 goto convert_failed;
4570 GST_DEBUG_OBJECT (parse,
4571 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
4573 GST_DEBUG_OBJECT (parse,
4574 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
4575 seeksegment.stop, seekstop);
4577 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
4580 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
4583 if (parse->srcpad) {
4584 GstEvent *fevent = gst_event_new_flush_start ();
4585 GST_DEBUG_OBJECT (parse, "sending flush start");
4587 gst_event_set_seqnum (fevent, seqnum);
4589 gst_pad_push_event (parse->srcpad, gst_event_ref (fevent));
4590 /* unlock upstream pull_range */
4591 gst_pad_push_event (parse->sinkpad, fevent);
4594 gst_pad_pause_task (parse->sinkpad);
4597 /* we should now be able to grab the streaming thread because we stopped it
4598 * with the above flush/pause code */
4599 GST_PAD_STREAM_LOCK (parse->sinkpad);
4601 /* save current position */
4602 last_stop = parse->segment.position;
4603 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
4606 /* now commit to new position */
4608 /* prepare for streaming again */
4610 GstEvent *fevent = gst_event_new_flush_stop (TRUE);
4611 GST_DEBUG_OBJECT (parse, "sending flush stop");
4612 gst_event_set_seqnum (fevent, seqnum);
4613 gst_pad_push_event (parse->srcpad, gst_event_ref (fevent));
4614 gst_pad_push_event (parse->sinkpad, fevent);
4615 gst_base_parse_clear_queues (parse);
4618 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
4620 /* store the newsegment event so it can be sent from the streaming thread. */
4621 /* This will be sent later in _loop() */
4622 segment_event = gst_event_new_segment (&parse->segment);
4623 gst_event_set_seqnum (segment_event, seqnum);
4624 parse->priv->pending_events =
4625 g_list_prepend (parse->priv->pending_events, segment_event);
4627 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
4628 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
4629 ", time = %" GST_TIME_FORMAT, format,
4630 GST_TIME_ARGS (parse->segment.start),
4631 GST_TIME_ARGS (parse->segment.stop),
4632 GST_TIME_ARGS (parse->segment.time));
4634 /* one last chance in pull mode to stay accurate;
4635 * maybe scan and subclass can find where to go */
4638 GstClockTime ts = seeksegment.position;
4640 gst_base_parse_locate_time (parse, &ts, &scanpos);
4644 /* running collected index now consists of several intervals,
4645 * so optimized check no longer possible */
4646 parse->priv->index_last_valid = FALSE;
4647 parse->priv->index_last_offset = 0;
4648 parse->priv->index_last_ts = 0;
4652 /* mark discont if we are going to stream from another position. */
4653 if (seekpos != parse->priv->offset) {
4654 GST_DEBUG_OBJECT (parse,
4655 "mark DISCONT, we did a seek to another position");
4656 parse->priv->offset = seekpos;
4657 parse->priv->last_offset = seekpos;
4658 parse->priv->seen_keyframe = FALSE;
4659 parse->priv->discont = TRUE;
4660 parse->priv->next_dts = start_ts;
4661 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
4662 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
4663 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
4664 parse->priv->sync_offset = seekpos;
4665 parse->priv->exact_position = accurate;
4668 /* Start streaming thread if paused */
4669 gst_pad_start_task (parse->sinkpad,
4670 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad, NULL);
4672 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
4677 GstEvent *new_event;
4678 GstBaseParseSeek *seek;
4679 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
4681 /* The only thing we need to do in PUSH-mode is to send the
4682 seek event (in bytes) to upstream. Segment / flush handling happens
4683 in corresponding src event handlers */
4684 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
4685 if (seekstop >= 0 && seekstop <= seekpos)
4687 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
4688 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
4689 gst_event_set_seqnum (new_event, seqnum);
4691 /* store segment info so its precise details can be reconstructed when
4692 * receiving newsegment;
4693 * this matters for all details when accurate seeking,
4694 * is most useful to preserve NONE stop time otherwise */
4695 seek = g_new0 (GstBaseParseSeek, 1);
4696 seek->segment = seeksegment;
4697 seek->accurate = accurate;
4698 seek->offset = seekpos;
4699 seek->start_ts = start_ts;
4700 GST_OBJECT_LOCK (parse);
4701 /* less optimal, but preserves order */
4702 parse->priv->pending_seeks =
4703 g_slist_append (parse->priv->pending_seeks, seek);
4704 GST_OBJECT_UNLOCK (parse);
4706 res = gst_pad_push_event (parse->sinkpad, new_event);
4709 GST_OBJECT_LOCK (parse);
4710 parse->priv->pending_seeks =
4711 g_slist_remove (parse->priv->pending_seeks, seek);
4712 GST_OBJECT_UNLOCK (parse);
4718 gst_event_unref (event);
4724 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
4730 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
4736 GST_DEBUG_OBJECT (parse, "seek in %s format was requested, but subclass "
4737 "couldn't convert that into TIME format", gst_format_get_name (format));
4743 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
4750 gst_base_parse_set_upstream_tags (GstBaseParse * parse, GstTagList * taglist)
4752 if (taglist == parse->priv->upstream_tags)
4755 if (parse->priv->upstream_tags) {
4756 gst_tag_list_unref (parse->priv->upstream_tags);
4757 parse->priv->upstream_tags = NULL;
4760 GST_INFO_OBJECT (parse, "upstream tags: %" GST_PTR_FORMAT, taglist);
4762 if (taglist != NULL)
4763 parse->priv->upstream_tags = gst_tag_list_ref (taglist);
4765 gst_base_parse_check_bitrate_tags (parse);
4770 gst_base_parse_set_index (GstElement * element, GstIndex * index)
4772 GstBaseParse *parse = GST_BASE_PARSE (element);
4774 GST_BASE_PARSE_INDEX_LOCK (parse);
4775 if (parse->priv->index)
4776 gst_object_unref (parse->priv->index);
4778 parse->priv->index = gst_object_ref (index);
4779 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4780 &parse->priv->index_id);
4781 parse->priv->own_index = FALSE;
4783 parse->priv->index = NULL;
4785 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4789 gst_base_parse_get_index (GstElement * element)
4791 GstBaseParse *parse = GST_BASE_PARSE (element);
4792 GstIndex *result = NULL;
4794 GST_BASE_PARSE_INDEX_LOCK (parse);
4795 if (parse->priv->index)
4796 result = gst_object_ref (parse->priv->index);
4797 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4803 static GstStateChangeReturn
4804 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4806 GstBaseParse *parse;
4807 GstStateChangeReturn result;
4809 parse = GST_BASE_PARSE (element);
4811 switch (transition) {
4812 case GST_STATE_CHANGE_READY_TO_PAUSED:
4813 /* If this is our own index destroy it as the
4814 * old entries might be wrong for the new stream */
4815 GST_BASE_PARSE_INDEX_LOCK (parse);
4816 if (parse->priv->own_index) {
4817 gst_object_unref (parse->priv->index);
4818 parse->priv->index = NULL;
4819 parse->priv->own_index = FALSE;
4822 /* If no index was created, generate one */
4823 if (G_UNLIKELY (!parse->priv->index)) {
4824 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4826 parse->priv->index = g_object_new (gst_mem_index_get_type (), NULL);
4827 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4828 &parse->priv->index_id);
4829 parse->priv->own_index = TRUE;
4831 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4837 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4839 switch (transition) {
4840 case GST_STATE_CHANGE_PAUSED_TO_READY:
4841 gst_base_parse_reset (parse);
4851 * gst_base_parse_set_ts_at_offset:
4852 * @parse: a #GstBaseParse
4853 * @offset: offset into current buffer
4855 * This function should only be called from a @handle_frame implementation.
4857 * #GstBaseParse creates initial timestamps for frames by using the last
4858 * timestamp seen in the stream before the frame starts. In certain
4859 * cases, the correct timestamps will occur in the stream after the
4860 * start of the frame, but before the start of the actual picture data.
4861 * This function can be used to set the timestamps based on the offset
4862 * into the frame data that the picture starts.
4867 gst_base_parse_set_ts_at_offset (GstBaseParse * parse, gsize offset)
4869 GstClockTime pts, dts;
4871 g_return_if_fail (GST_IS_BASE_PARSE (parse));
4873 pts = gst_adapter_prev_pts_at_offset (parse->priv->adapter, offset, NULL);
4874 dts = gst_adapter_prev_dts_at_offset (parse->priv->adapter, offset, NULL);
4876 if (!GST_CLOCK_TIME_IS_VALID (pts) || !GST_CLOCK_TIME_IS_VALID (dts)) {
4877 GST_DEBUG_OBJECT (parse,
4878 "offset adapter timestamps dts=%" GST_TIME_FORMAT " pts=%"
4879 GST_TIME_FORMAT, GST_TIME_ARGS (dts), GST_TIME_ARGS (pts));
4881 if (GST_CLOCK_TIME_IS_VALID (pts) && (parse->priv->prev_pts != pts))
4882 parse->priv->prev_pts = parse->priv->next_pts = pts;
4884 if (GST_CLOCK_TIME_IS_VALID (dts) && (parse->priv->prev_dts != dts)) {
4885 parse->priv->prev_dts = parse->priv->next_dts = dts;
4886 parse->priv->prev_dts_from_pts = FALSE;
4891 * gst_base_parse_merge_tags:
4892 * @parse: a #GstBaseParse
4893 * @tags: (allow-none): a #GstTagList to merge, or NULL to unset
4894 * previously-set tags
4895 * @mode: the #GstTagMergeMode to use, usually #GST_TAG_MERGE_REPLACE
4897 * Sets the parser subclass's tags and how they should be merged with any
4898 * upstream stream tags. This will override any tags previously-set
4899 * with gst_base_parse_merge_tags().
4901 * Note that this is provided for convenience, and the subclass is
4902 * not required to use this and can still do tag handling on its own.
4907 gst_base_parse_merge_tags (GstBaseParse * parse, GstTagList * tags,
4908 GstTagMergeMode mode)
4910 g_return_if_fail (GST_IS_BASE_PARSE (parse));
4911 g_return_if_fail (tags == NULL || GST_IS_TAG_LIST (tags));
4912 g_return_if_fail (tags == NULL || mode != GST_TAG_MERGE_UNDEFINED);
4914 GST_OBJECT_LOCK (parse);
4916 if (tags != parse->priv->parser_tags) {
4917 if (parse->priv->parser_tags) {
4918 gst_tag_list_unref (parse->priv->parser_tags);
4919 parse->priv->parser_tags = NULL;
4920 parse->priv->parser_tags_merge_mode = GST_TAG_MERGE_APPEND;
4923 parse->priv->parser_tags = gst_tag_list_ref (tags);
4924 parse->priv->parser_tags_merge_mode = mode;
4927 GST_DEBUG_OBJECT (parse, "setting parser tags to %" GST_PTR_FORMAT
4928 " (mode %d)", tags, parse->priv->parser_tags_merge_mode);
4930 gst_base_parse_check_bitrate_tags (parse);
4931 parse->priv->tags_changed = TRUE;
4934 GST_OBJECT_UNLOCK (parse);