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 * @short_description: Base class for stream parsers
27 * @see_also: #GstBaseTransform
29 * This base class is for parser elements that process data and splits it
30 * into separate audio/video/whatever frames.
34 * <listitem><para>provides one sink pad and one source pad</para></listitem>
35 * <listitem><para>handles state changes</para></listitem>
36 * <listitem><para>can operate in pull mode or push mode</para></listitem>
37 * <listitem><para>handles seeking in both modes</para></listitem>
38 * <listitem><para>handles events (SEGMENT/EOS/FLUSH)</para></listitem>
40 * handles queries (POSITION/DURATION/SEEKING/FORMAT/CONVERT)
42 * <listitem><para>handles flushing</para></listitem>
45 * The purpose of this base class is to provide the basic functionality of
46 * a parser and share a lot of rather complex code.
48 * Description of the parsing mechanism:
51 * <itemizedlist><title>Set-up phase</title>
53 * GstBaseParse calls @start to inform subclass that data processing is
57 * GstBaseParse class calls @set_sink_caps to inform the subclass about
58 * incoming sinkpad caps. Subclass could already set the srcpad caps
59 * accordingly, but this might be delayed until calling
60 * gst_base_parse_finish_frame() with a non-queued frame.
63 * At least at this point subclass needs to tell the GstBaseParse class
64 * how big data chunks it wants to receive (min_frame_size). It can do
65 * this with gst_base_parse_set_min_frame_size().
68 * GstBaseParse class sets up appropriate data passing mode (pull/push)
69 * and starts to process the data.
75 * <title>Parsing phase</title>
77 * GstBaseParse gathers at least min_frame_size bytes of data either
78 * by pulling it from upstream or collecting buffers in an internal
82 * A buffer of (at least) min_frame_size bytes is passed to subclass with
83 * @handle_frame. Subclass checks the contents and can optionally
84 * return GST_FLOW_OK along with an amount of data to be skipped to find
85 * a valid frame (which will result in a subsequent DISCONT).
86 * If, otherwise, the buffer does not hold a complete frame,
87 * @handle_frame can merely return and will be called again when additional
88 * data is available. In push mode this amounts to an
89 * additional input buffer (thus minimal additional latency), in pull mode
90 * this amounts to some arbitrary reasonable buffer size increase.
91 * Of course, gst_base_parse_set_min_frame_size() could also be used if a
92 * very specific known amount of additional data is required.
93 * If, however, the buffer holds a complete valid frame, it can pass
94 * the size of this frame to gst_base_parse_finish_frame().
95 * If acting as a converter, it can also merely indicate consumed input data
96 * while simultaneously providing custom output data.
97 * Note that baseclass performs some processing (such as tracking
98 * overall consumed data rate versus duration) for each finished frame,
99 * but other state is only updated upon each call to @handle_frame
100 * (such as tracking upstream input timestamp).
102 * Subclass is also responsible for setting the buffer metadata
103 * (e.g. buffer timestamp and duration, or keyframe if applicable).
104 * (although the latter can also be done by GstBaseParse if it is
105 * appropriately configured, see below). Frame is provided with
106 * timestamp derived from upstream (as much as generally possible),
107 * duration obtained from configuration (see below), and offset
108 * if meaningful (in pull mode).
110 * Note that @check_valid_frame might receive any small
111 * amount of input data when leftover data is being drained (e.g. at EOS).
114 * As part of finish frame processing,
115 * just prior to actually pushing the buffer in question,
116 * it is passed to @pre_push_frame which gives subclass yet one
117 * last chance to examine buffer metadata, or to send some custom (tag)
118 * events, or to perform custom (segment) filtering.
121 * During the parsing process GstBaseParseClass will handle both srcpad
122 * and sinkpad events. They will be passed to subclass if @event or
123 * @src_event callbacks have been provided.
128 * <itemizedlist><title>Shutdown phase</title>
130 * GstBaseParse class calls @stop to inform the subclass that data
131 * parsing will be stopped.
137 * Subclass is responsible for providing pad template caps for
138 * source and sink pads. The pads need to be named "sink" and "src". It also
139 * needs to set the fixed caps on srcpad, when the format is ensured (e.g.
140 * when base class calls subclass' @set_sink_caps function).
142 * This base class uses #GST_FORMAT_DEFAULT as a meaning of frames. So,
143 * subclass conversion routine needs to know that conversion from
144 * #GST_FORMAT_TIME to #GST_FORMAT_DEFAULT must return the
145 * frame number that can be found from the given byte position.
147 * GstBaseParse uses subclasses conversion methods also for seeking (or
148 * otherwise uses its own default one, see also below).
150 * Subclass @start and @stop functions will be called to inform the beginning
151 * and end of data processing.
153 * Things that subclass need to take care of:
155 * <listitem><para>Provide pad templates</para></listitem>
157 * Fixate the source pad caps when appropriate
160 * Inform base class how big data chunks should be retrieved. This is
161 * done with gst_base_parse_set_min_frame_size() function.
164 * Examine data chunks passed to subclass with @handle_frame and pass
165 * proper frame(s) to gst_base_parse_finish_frame(), and setting src pad
166 * caps and timestamps on frame.
168 * <listitem><para>Provide conversion functions</para></listitem>
170 * Update the duration information with gst_base_parse_set_duration()
173 * Optionally passthrough using gst_base_parse_set_passthrough()
176 * Configure various baseparse parameters using
177 * gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
178 * and gst_base_parse_set_frame_rate().
181 * In particular, if subclass is unable to determine a duration, but
182 * parsing (or specs) yields a frames per seconds rate, then this can be
183 * provided to GstBaseParse to enable it to cater for
184 * buffer time metadata (which will be taken from upstream as much as
185 * possible). Internally keeping track of frame durations and respective
186 * sizes that have been pushed provides GstBaseParse with an estimated
187 * bitrate. A default @convert (used if not overridden) will then use these
188 * rates to perform obvious conversions. These rates are also used to
189 * update (estimated) duration at regular frame intervals.
196 * - In push mode provide a queue of adapter-"queued" buffers for upstream
198 * - Queue buffers/events until caps are set
208 #include <gst/base/gstadapter.h>
210 #include "gstbaseparse.h"
212 /* FIXME: get rid of old GstIndex code */
213 #include "gstindex.h"
214 #include "gstindex.c"
215 #include "gstmemindex.c"
217 #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
219 #define MIN_FRAMES_TO_POST_BITRATE 10
220 #define TARGET_DIFFERENCE (20 * GST_SECOND)
221 #define MAX_INDEX_ENTRIES 4096
223 GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
224 #define GST_CAT_DEFAULT gst_base_parse_debug
226 /* Supported formats */
227 static const GstFormat fmtlist[] = {
234 #define GST_BASE_PARSE_GET_PRIVATE(obj) \
235 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
237 struct _GstBaseParsePrivate
244 GstFormat duration_fmt;
245 gint64 estimated_duration;
246 gint64 estimated_drift;
248 guint min_frame_size;
249 gboolean disable_passthrough;
250 gboolean passthrough;
251 gboolean pts_interpolate;
254 gboolean has_timing_info;
255 guint fps_num, fps_den;
256 gint update_interval;
258 guint lead_in, lead_out;
259 GstClockTime lead_in_ts, lead_out_ts;
260 GstClockTime min_latency, max_latency;
268 GstClockTime next_pts;
269 GstClockTime next_dts;
270 GstClockTime prev_pts;
271 GstClockTime prev_dts;
272 GstClockTime frame_duration;
273 gboolean seen_keyframe;
279 guint64 data_bytecount;
280 guint64 acc_duration;
281 GstClockTime first_frame_pts;
282 GstClockTime first_frame_dts;
283 gint64 first_frame_offset;
285 gboolean post_min_bitrate;
286 gboolean post_avg_bitrate;
287 gboolean post_max_bitrate;
291 guint posted_avg_bitrate;
293 /* frames/buffers that are queued and ready to go on OK */
294 GQueue queued_frames;
298 /* index entry storage, either ours or provided */
304 /* seek table entries only maintained if upstream is BYTE seekable */
305 gboolean upstream_seekable;
306 gboolean upstream_has_duration;
307 gint64 upstream_size;
308 GstFormat upstream_format;
309 /* minimum distance between two index entries */
310 GstClockTimeDiff idx_interval;
311 guint64 idx_byte_interval;
312 /* ts and offset of last entry added */
313 GstClockTime index_last_ts;
314 gint64 index_last_offset;
315 gboolean index_last_valid;
317 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
318 gboolean exact_position;
319 /* seek events are temporarily kept to match them with newsegments */
320 GSList *pending_seeks;
322 /* reverse playback */
323 GSList *buffers_pending;
324 GSList *buffers_head;
325 GSList *buffers_queued;
326 GSList *buffers_send;
327 GstClockTime last_pts;
328 GstClockTime last_dts;
331 /* Pending serialized events */
332 GList *pending_events;
333 /* Newsegment event to be sent after SEEK */
334 gboolean pending_segment;
336 /* offset of last parsed frame/data */
338 /* force a new frame, regardless of offset */
340 /* whether we are merely scanning for a frame */
342 /* ... and resulting frame, if any */
343 GstBaseParseFrame *scanned_frame;
345 /* TRUE if we're still detecting the format, i.e.
346 * if ::detect() is still called for future buffers */
348 GList *detect_buffers;
349 guint detect_buffers_size;
351 /* if TRUE, a STREAM_START event needs to be pushed */
352 gboolean push_stream_start;
355 typedef struct _GstBaseParseSeek
360 GstClockTime start_ts;
363 #define DEFAULT_DISABLE_PASSTHROUGH FALSE
368 PROP_DISABLE_PASSTHROUGH,
372 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
373 g_mutex_lock (&parse->priv->index_lock);
374 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
375 g_mutex_unlock (&parse->priv->index_lock);
377 static GstElementClass *parent_class = NULL;
379 static void gst_base_parse_class_init (GstBaseParseClass * klass);
380 static void gst_base_parse_init (GstBaseParse * parse,
381 GstBaseParseClass * klass);
384 gst_base_parse_get_type (void)
386 static volatile gsize base_parse_type = 0;
388 if (g_once_init_enter (&base_parse_type)) {
389 static const GTypeInfo base_parse_info = {
390 sizeof (GstBaseParseClass),
391 (GBaseInitFunc) NULL,
392 (GBaseFinalizeFunc) NULL,
393 (GClassInitFunc) gst_base_parse_class_init,
396 sizeof (GstBaseParse),
398 (GInstanceInitFunc) gst_base_parse_init,
402 _type = g_type_register_static (GST_TYPE_ELEMENT,
403 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
404 g_once_init_leave (&base_parse_type, _type);
406 return (GType) base_parse_type;
409 static void gst_base_parse_finalize (GObject * object);
411 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
412 GstStateChange transition);
413 static void gst_base_parse_reset (GstBaseParse * parse);
416 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
417 static GstIndex *gst_base_parse_get_index (GstElement * element);
420 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
422 static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
423 GstObject * parent, GstPadMode mode, gboolean active);
424 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
426 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
428 static void gst_base_parse_set_property (GObject * object, guint prop_id,
429 const GValue * value, GParamSpec * pspec);
430 static void gst_base_parse_get_property (GObject * object, guint prop_id,
431 GValue * value, GParamSpec * pspec);
433 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
435 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
438 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
440 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
443 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
445 static void gst_base_parse_loop (GstPad * pad);
447 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
448 GstBaseParseFrame * frame);
450 static gboolean gst_base_parse_sink_event_default (GstBaseParse * parse,
453 static gboolean gst_base_parse_src_event_default (GstBaseParse * parse,
456 static gboolean gst_base_parse_sink_query_default (GstBaseParse * parse,
458 static gboolean gst_base_parse_src_query_default (GstBaseParse * parse,
461 static void gst_base_parse_drain (GstBaseParse * parse);
463 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
464 gboolean post_min, gboolean post_avg, gboolean post_max);
466 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
467 GstClockTime time, gboolean before, GstClockTime * _ts);
468 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
469 GstClockTime * _time, gint64 * _offset);
471 static GstFlowReturn gst_base_parse_start_fragment (GstBaseParse * parse);
472 static GstFlowReturn gst_base_parse_finish_fragment (GstBaseParse * parse,
475 static inline GstFlowReturn gst_base_parse_check_sync (GstBaseParse * parse);
477 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
479 static void gst_base_parse_push_pending_events (GstBaseParse * parse);
482 gst_base_parse_clear_queues (GstBaseParse * parse)
484 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
485 g_slist_free (parse->priv->buffers_queued);
486 parse->priv->buffers_queued = NULL;
487 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
489 g_slist_free (parse->priv->buffers_pending);
490 parse->priv->buffers_pending = NULL;
491 g_slist_foreach (parse->priv->buffers_head, (GFunc) gst_buffer_unref, NULL);
492 g_slist_free (parse->priv->buffers_head);
493 parse->priv->buffers_head = NULL;
494 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
495 g_slist_free (parse->priv->buffers_send);
496 parse->priv->buffers_send = NULL;
498 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
499 g_list_free (parse->priv->detect_buffers);
500 parse->priv->detect_buffers = NULL;
501 parse->priv->detect_buffers_size = 0;
503 g_queue_foreach (&parse->priv->queued_frames,
504 (GFunc) gst_base_parse_frame_free, NULL);
505 g_queue_clear (&parse->priv->queued_frames);
507 gst_buffer_replace (&parse->priv->cache, NULL);
509 g_list_foreach (parse->priv->pending_events, (GFunc) gst_event_unref, NULL);
510 g_list_free (parse->priv->pending_events);
511 parse->priv->pending_events = NULL;
512 parse->priv->pending_segment = FALSE;
516 gst_base_parse_finalize (GObject * object)
518 GstBaseParse *parse = GST_BASE_PARSE (object);
520 g_object_unref (parse->priv->adapter);
522 if (parse->priv->cache) {
523 gst_buffer_unref (parse->priv->cache);
524 parse->priv->cache = NULL;
527 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
529 g_list_free (parse->priv->pending_events);
530 parse->priv->pending_events = NULL;
531 parse->priv->pending_segment = FALSE;
533 if (parse->priv->index) {
534 gst_object_unref (parse->priv->index);
535 parse->priv->index = NULL;
537 g_mutex_clear (&parse->priv->index_lock);
539 gst_base_parse_clear_queues (parse);
541 G_OBJECT_CLASS (parent_class)->finalize (object);
545 gst_base_parse_class_init (GstBaseParseClass * klass)
547 GObjectClass *gobject_class;
548 GstElementClass *gstelement_class;
550 gobject_class = G_OBJECT_CLASS (klass);
551 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
552 parent_class = g_type_class_peek_parent (klass);
554 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
555 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_base_parse_set_property);
556 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_base_parse_get_property);
559 * GstBaseParse:disable-passthrough:
561 * If set to #TRUE, baseparse will unconditionally force parsing of the
562 * incoming data. This can be required in the rare cases where the incoming
563 * side-data (caps, pts, dts, ...) is not trusted by the user and wants to
564 * force validation and parsing of the incoming data.
565 * If set to #FALSE, decision of whether to parse the data or not is up to
566 * the implementation (standard behaviour).
568 g_object_class_install_property (gobject_class, PROP_DISABLE_PASSTHROUGH,
569 g_param_spec_boolean ("disable-passthrough", "Disable passthrough",
570 "Force processing (disables passthrough)",
571 DEFAULT_DISABLE_PASSTHROUGH,
572 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
574 gstelement_class = (GstElementClass *) klass;
575 gstelement_class->change_state =
576 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
579 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
580 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
583 /* Default handlers */
584 klass->sink_event = gst_base_parse_sink_event_default;
585 klass->src_event = gst_base_parse_src_event_default;
586 klass->sink_query = gst_base_parse_sink_query_default;
587 klass->src_query = gst_base_parse_src_query_default;
588 klass->convert = gst_base_parse_convert_default;
590 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
591 "baseparse element");
595 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
597 GstPadTemplate *pad_template;
599 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
601 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
604 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
605 g_return_if_fail (pad_template != NULL);
606 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
607 gst_pad_set_event_function (parse->sinkpad,
608 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
609 gst_pad_set_query_function (parse->sinkpad,
610 GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
611 gst_pad_set_chain_function (parse->sinkpad,
612 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
613 gst_pad_set_activate_function (parse->sinkpad,
614 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
615 gst_pad_set_activatemode_function (parse->sinkpad,
616 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
617 GST_PAD_SET_PROXY_ALLOCATION (parse->sinkpad);
618 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
620 GST_DEBUG_OBJECT (parse, "sinkpad created");
623 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
624 g_return_if_fail (pad_template != NULL);
625 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
626 gst_pad_set_event_function (parse->srcpad,
627 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
628 gst_pad_set_query_function (parse->srcpad,
629 GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
630 gst_pad_use_fixed_caps (parse->srcpad);
631 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
632 GST_DEBUG_OBJECT (parse, "src created");
634 g_queue_init (&parse->priv->queued_frames);
636 parse->priv->adapter = gst_adapter_new ();
638 parse->priv->pad_mode = GST_PAD_MODE_NONE;
640 g_mutex_init (&parse->priv->index_lock);
643 gst_base_parse_reset (parse);
644 GST_DEBUG_OBJECT (parse, "init ok");
646 GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE);
650 gst_base_parse_set_property (GObject * object, guint prop_id,
651 const GValue * value, GParamSpec * pspec)
653 GstBaseParse *parse = GST_BASE_PARSE (object);
656 case PROP_DISABLE_PASSTHROUGH:
657 parse->priv->disable_passthrough = g_value_get_boolean (value);
660 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
666 gst_base_parse_get_property (GObject * object, guint prop_id, GValue * value,
669 GstBaseParse *parse = GST_BASE_PARSE (object);
672 case PROP_DISABLE_PASSTHROUGH:
673 g_value_set_boolean (value, parse->priv->disable_passthrough);
676 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
681 static GstBaseParseFrame *
682 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
684 GstBaseParseFrame *copy;
686 copy = g_slice_dup (GstBaseParseFrame, frame);
687 copy->buffer = gst_buffer_ref (frame->buffer);
688 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
690 GST_TRACE ("copied frame %p -> %p", frame, copy);
696 gst_base_parse_frame_free (GstBaseParseFrame * frame)
698 GST_TRACE ("freeing frame %p", frame);
701 gst_buffer_unref (frame->buffer);
702 frame->buffer = NULL;
705 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
706 g_slice_free (GstBaseParseFrame, frame);
708 memset (frame, 0, sizeof (*frame));
712 G_DEFINE_BOXED_TYPE (GstBaseParseFrame, gst_base_parse_frame,
713 (GBoxedCopyFunc) gst_base_parse_frame_copy,
714 (GBoxedFreeFunc) gst_base_parse_frame_free);
717 * gst_base_parse_frame_init:
718 * @frame: #GstBaseParseFrame.
720 * Sets a #GstBaseParseFrame to initial state. Currently this means
721 * all public fields are zero-ed and a private flag is set to make
722 * sure gst_base_parse_frame_free() only frees the contents but not
723 * the actual frame. Use this function to initialise a #GstBaseParseFrame
724 * allocated on the stack.
727 gst_base_parse_frame_init (GstBaseParseFrame * frame)
729 memset (frame, 0, sizeof (GstBaseParseFrame));
730 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
731 GST_TRACE ("inited frame %p", frame);
735 * gst_base_parse_frame_new:
736 * @buffer: (transfer none): a #GstBuffer
738 * @overhead: number of bytes in this frame which should be counted as
739 * metadata overhead, ie. not used to calculate the average bitrate.
740 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
742 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
743 * elements written in C should usually allocate the frame on the stack and
744 * then use gst_base_parse_frame_init() to initialise it.
746 * Returns: a newly-allocated #GstBaseParseFrame. Free with
747 * gst_base_parse_frame_free() when no longer needed.
750 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
753 GstBaseParseFrame *frame;
755 frame = g_slice_new0 (GstBaseParseFrame);
756 frame->buffer = gst_buffer_ref (buffer);
758 GST_TRACE ("created frame %p", frame);
763 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
766 gst_buffer_replace (&frame->buffer, buf);
770 /* set flags one by one for clarity */
771 if (G_UNLIKELY (parse->priv->drain))
772 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
774 /* losing sync is pretty much a discont (and vice versa), no ? */
775 if (G_UNLIKELY (parse->priv->discont))
776 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
780 gst_base_parse_reset (GstBaseParse * parse)
782 GST_OBJECT_LOCK (parse);
783 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
784 parse->priv->duration = -1;
785 parse->priv->min_frame_size = 1;
786 parse->priv->discont = TRUE;
787 parse->priv->flushing = FALSE;
788 parse->priv->offset = 0;
789 parse->priv->sync_offset = 0;
790 parse->priv->update_interval = -1;
791 parse->priv->fps_num = parse->priv->fps_den = 0;
792 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
793 parse->priv->lead_in = parse->priv->lead_out = 0;
794 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
795 parse->priv->bitrate = 0;
796 parse->priv->framecount = 0;
797 parse->priv->bytecount = 0;
798 parse->priv->acc_duration = 0;
799 parse->priv->first_frame_pts = GST_CLOCK_TIME_NONE;
800 parse->priv->first_frame_dts = GST_CLOCK_TIME_NONE;
801 parse->priv->first_frame_offset = -1;
802 parse->priv->estimated_duration = -1;
803 parse->priv->estimated_drift = 0;
804 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
805 parse->priv->next_dts = 0;
806 parse->priv->syncable = TRUE;
807 parse->priv->disable_passthrough = DEFAULT_DISABLE_PASSTHROUGH;
808 parse->priv->passthrough = FALSE;
809 parse->priv->pts_interpolate = TRUE;
810 parse->priv->infer_ts = TRUE;
811 parse->priv->has_timing_info = FALSE;
812 parse->priv->post_min_bitrate = TRUE;
813 parse->priv->post_avg_bitrate = TRUE;
814 parse->priv->post_max_bitrate = TRUE;
815 parse->priv->min_bitrate = G_MAXUINT;
816 parse->priv->max_bitrate = 0;
817 parse->priv->avg_bitrate = 0;
818 parse->priv->posted_avg_bitrate = 0;
820 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
821 parse->priv->index_last_offset = -1;
822 parse->priv->index_last_valid = TRUE;
823 parse->priv->upstream_seekable = FALSE;
824 parse->priv->upstream_size = 0;
825 parse->priv->upstream_has_duration = FALSE;
826 parse->priv->upstream_format = GST_FORMAT_UNDEFINED;
827 parse->priv->idx_interval = 0;
828 parse->priv->idx_byte_interval = 0;
829 parse->priv->exact_position = TRUE;
830 parse->priv->seen_keyframe = FALSE;
832 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
833 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
834 parse->priv->last_offset = 0;
836 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
838 g_list_free (parse->priv->pending_events);
839 parse->priv->pending_events = NULL;
840 parse->priv->pending_segment = FALSE;
842 if (parse->priv->cache) {
843 gst_buffer_unref (parse->priv->cache);
844 parse->priv->cache = NULL;
847 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
848 g_slist_free (parse->priv->pending_seeks);
849 parse->priv->pending_seeks = NULL;
851 if (parse->priv->adapter)
852 gst_adapter_clear (parse->priv->adapter);
854 parse->priv->new_frame = TRUE;
856 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
857 g_list_free (parse->priv->detect_buffers);
858 parse->priv->detect_buffers = NULL;
859 parse->priv->detect_buffers_size = 0;
860 GST_OBJECT_UNLOCK (parse);
863 /* gst_base_parse_parse_frame:
864 * @parse: #GstBaseParse.
865 * @buffer: #GstBuffer.
867 * Default callback for parse_frame.
870 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
872 GstBuffer *buffer = frame->buffer;
874 if (!GST_BUFFER_PTS_IS_VALID (buffer) &&
875 GST_CLOCK_TIME_IS_VALID (parse->priv->next_pts)) {
876 GST_BUFFER_PTS (buffer) = parse->priv->next_pts;
878 if (!GST_BUFFER_DTS_IS_VALID (buffer) &&
879 GST_CLOCK_TIME_IS_VALID (parse->priv->next_dts)) {
880 GST_BUFFER_DTS (buffer) = parse->priv->next_dts;
882 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
883 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
884 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
889 /* gst_base_parse_convert:
890 * @parse: #GstBaseParse.
891 * @src_format: #GstFormat describing the source format.
892 * @src_value: Source value to be converted.
893 * @dest_format: #GstFormat defining the converted format.
894 * @dest_value: Pointer where the conversion result will be put.
896 * Converts using configured "convert" vmethod in #GstBaseParse class.
898 * Returns: TRUE if conversion was successful.
901 gst_base_parse_convert (GstBaseParse * parse,
902 GstFormat src_format,
903 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
905 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
908 g_return_val_if_fail (dest_value != NULL, FALSE);
913 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
915 #ifndef GST_DISABLE_GST_DEBUG
918 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
919 GST_LOG_OBJECT (parse,
920 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
921 GST_TIME_ARGS (src_value), *dest_value);
922 } else if (dest_format == GST_FORMAT_TIME &&
923 src_format == GST_FORMAT_BYTES) {
924 GST_LOG_OBJECT (parse,
925 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
926 src_value, GST_TIME_ARGS (*dest_value));
928 GST_LOG_OBJECT (parse,
929 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
930 GST_STR_NULL (gst_format_get_name (src_format)),
931 GST_STR_NULL (gst_format_get_name (dest_format)),
932 src_value, *dest_value);
935 GST_DEBUG_OBJECT (parse, "conversion failed");
943 /* gst_base_parse_sink_event:
944 * @pad: #GstPad that received the event.
945 * @event: #GstEvent to be handled.
947 * Handler for sink pad events.
949 * Returns: TRUE if the event was handled.
952 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
954 GstBaseParse *parse = GST_BASE_PARSE (parent);
955 GstBaseParseClass *bclass = GST_BASE_PARSE_GET_CLASS (parse);
958 ret = bclass->sink_event (parse, event);
964 /* gst_base_parse_sink_event_default:
965 * @parse: #GstBaseParse.
966 * @event: #GstEvent to be handled.
968 * Element-level event handler function.
970 * The event will be unreffed only if it has been handled and this
971 * function returns %TRUE
973 * Returns: %TRUE if the event was handled and not need forwarding.
976 gst_base_parse_sink_event_default (GstBaseParse * parse, GstEvent * event)
978 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
979 gboolean ret = FALSE;
980 gboolean forward_immediate = FALSE;
982 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
983 GST_EVENT_TYPE_NAME (event));
985 switch (GST_EVENT_TYPE (event)) {
990 gst_event_parse_caps (event, &caps);
991 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
993 if (klass->set_sink_caps)
994 ret = klass->set_sink_caps (parse, caps);
998 /* will send our own caps downstream */
999 gst_event_unref (event);
1003 case GST_EVENT_SEGMENT:
1005 const GstSegment *in_segment;
1006 GstSegment out_segment;
1007 gint64 offset = 0, next_dts;
1008 guint32 seqnum = gst_event_get_seqnum (event);
1010 gst_event_parse_segment (event, &in_segment);
1011 gst_segment_init (&out_segment, GST_FORMAT_TIME);
1013 GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
1015 parse->priv->upstream_format = in_segment->format;
1016 if (in_segment->format == GST_FORMAT_BYTES) {
1017 GstBaseParseSeek *seek = NULL;
1020 /* stop time is allowed to be open-ended, but not start & pos */
1021 offset = in_segment->time;
1023 GST_OBJECT_LOCK (parse);
1024 for (node = parse->priv->pending_seeks; node; node = node->next) {
1025 GstBaseParseSeek *tmp = node->data;
1027 if (tmp->offset == offset) {
1032 parse->priv->pending_seeks =
1033 g_slist_remove (parse->priv->pending_seeks, seek);
1034 GST_OBJECT_UNLOCK (parse);
1037 GST_DEBUG_OBJECT (parse,
1038 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
1039 seek->accurate ? " accurate" : "", &seek->segment);
1041 out_segment.start = seek->segment.start;
1042 out_segment.stop = seek->segment.stop;
1043 out_segment.time = seek->segment.start;
1045 next_dts = seek->start_ts;
1046 parse->priv->exact_position = seek->accurate;
1049 /* best attempt convert */
1050 /* as these are only estimates, stop is kept open-ended to avoid
1051 * premature cutting */
1052 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
1053 GST_FORMAT_TIME, (gint64 *) & next_dts);
1055 out_segment.start = next_dts;
1056 out_segment.stop = GST_CLOCK_TIME_NONE;
1057 out_segment.time = next_dts;
1059 parse->priv->exact_position = (in_segment->start == 0);
1062 gst_event_unref (event);
1064 event = gst_event_new_segment (&out_segment);
1065 gst_event_set_seqnum (event, seqnum);
1067 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1068 GST_SEGMENT_FORMAT, in_segment);
1070 } else if (in_segment->format != GST_FORMAT_TIME) {
1071 /* Unknown incoming segment format. Output a default open-ended
1073 gst_event_unref (event);
1075 out_segment.start = 0;
1076 out_segment.stop = GST_CLOCK_TIME_NONE;
1077 out_segment.time = 0;
1079 event = gst_event_new_segment (&out_segment);
1080 gst_event_set_seqnum (event, seqnum);
1084 /* not considered BYTE seekable if it is talking to us in TIME,
1085 * whatever else it might claim */
1086 parse->priv->upstream_seekable = FALSE;
1087 next_dts = in_segment->start;
1090 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1093 gst_segment_set_newsegment (&parse->segment, update, rate,
1094 applied_rate, format, start, stop, start);
1097 /* save the segment for later, right before we push a new buffer so that
1098 * the caps are fixed and the next linked element can receive
1100 parse->priv->pending_segment = TRUE;
1103 /* but finish the current segment */
1104 GST_DEBUG_OBJECT (parse, "draining current segment");
1105 if (in_segment->rate > 0.0)
1106 gst_base_parse_drain (parse);
1108 gst_base_parse_finish_fragment (parse, FALSE);
1109 gst_adapter_clear (parse->priv->adapter);
1111 parse->priv->offset = offset;
1112 parse->priv->sync_offset = offset;
1113 parse->priv->next_dts = next_dts;
1114 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
1115 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
1116 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
1117 parse->priv->prev_pts = GST_CLOCK_TIME_NONE;
1118 parse->priv->prev_dts = GST_CLOCK_TIME_NONE;
1119 parse->priv->discont = TRUE;
1120 parse->priv->seen_keyframe = FALSE;
1124 case GST_EVENT_FLUSH_START:
1125 GST_OBJECT_LOCK (parse);
1126 parse->priv->flushing = TRUE;
1127 GST_OBJECT_UNLOCK (parse);
1130 case GST_EVENT_FLUSH_STOP:
1131 gst_adapter_clear (parse->priv->adapter);
1132 gst_base_parse_clear_queues (parse);
1133 parse->priv->flushing = FALSE;
1134 parse->priv->discont = TRUE;
1135 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
1136 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
1137 parse->priv->new_frame = TRUE;
1139 forward_immediate = TRUE;
1143 if (parse->segment.rate > 0.0)
1144 gst_base_parse_drain (parse);
1146 gst_base_parse_finish_fragment (parse, TRUE);
1148 /* If we STILL have zero frames processed, fire an error */
1149 if (parse->priv->framecount == 0) {
1150 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1151 ("No valid frames found before end of stream"), (NULL));
1153 /* newsegment and other serialized events before eos */
1154 gst_base_parse_push_pending_events (parse);
1156 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1157 /* We've not posted bitrate tags yet - do so now */
1158 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
1160 forward_immediate = TRUE;
1162 case GST_EVENT_CUSTOM_DOWNSTREAM:{
1163 /* FIXME: Code duplicated from libgstvideo because core can't depend on -base */
1164 #ifndef GST_VIDEO_EVENT_STILL_STATE_NAME
1165 #define GST_VIDEO_EVENT_STILL_STATE_NAME "GstEventStillFrame"
1168 const GstStructure *s;
1169 gboolean ev_still_state;
1171 s = gst_event_get_structure (event);
1173 gst_structure_has_name (s, GST_VIDEO_EVENT_STILL_STATE_NAME) &&
1174 gst_structure_get_boolean (s, "still-state", &ev_still_state)) {
1175 if (ev_still_state) {
1176 GST_DEBUG_OBJECT (parse, "draining current data for still-frame");
1177 if (parse->segment.rate > 0.0)
1178 gst_base_parse_drain (parse);
1180 gst_base_parse_finish_fragment (parse, TRUE);
1182 forward_immediate = TRUE;
1188 GST_DEBUG_OBJECT (parse, "draining current data due to gap event");
1189 if (parse->segment.rate > 0.0)
1190 gst_base_parse_drain (parse);
1192 gst_base_parse_finish_fragment (parse, TRUE);
1193 forward_immediate = TRUE;
1197 /* See if any bitrate tags were posted */
1198 gst_base_parse_handle_tag (parse, event);
1201 case GST_EVENT_STREAM_START:
1202 if (parse->priv->pad_mode != GST_PAD_MODE_PULL)
1203 forward_immediate = TRUE;
1210 /* Forward non-serialized events and EOS/FLUSH_STOP immediately.
1211 * For EOS this is required because no buffer or serialized event
1212 * will come after EOS and nothing could trigger another
1213 * _finish_frame() call. *
1214 * If the subclass handles sending of EOS manually it can return
1215 * _DROPPED from ::finish() and all other subclasses should have
1216 * decoded/flushed all remaining data before this
1218 * For FLUSH_STOP this is required because it is expected
1219 * to be forwarded immediately and no buffers are queued anyway.
1222 if (!GST_EVENT_IS_SERIALIZED (event) || forward_immediate) {
1223 ret = gst_pad_push_event (parse->srcpad, event);
1225 // GST_VIDEO_DECODER_STREAM_LOCK (decoder);
1226 parse->priv->pending_events =
1227 g_list_prepend (parse->priv->pending_events, event);
1228 // GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
1233 GST_DEBUG_OBJECT (parse, "event handled");
1239 gst_base_parse_sink_query_default (GstBaseParse * parse, GstQuery * query)
1244 pad = GST_BASE_PARSE_SINK_PAD (parse);
1246 switch (GST_QUERY_TYPE (query)) {
1247 case GST_QUERY_CAPS:
1249 GstBaseParseClass *bclass;
1251 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1253 if (bclass->get_sink_caps) {
1254 GstCaps *caps, *filter;
1256 gst_query_parse_caps (query, &filter);
1257 caps = bclass->get_sink_caps (parse, filter);
1258 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1260 gst_query_set_caps_result (query, caps);
1261 gst_caps_unref (caps);
1265 GstCaps *caps, *template_caps, *filter;
1267 gst_query_parse_caps (query, &filter);
1268 template_caps = gst_pad_get_pad_template_caps (pad);
1269 if (filter != NULL) {
1271 gst_caps_intersect_full (filter, template_caps,
1272 GST_CAPS_INTERSECT_FIRST);
1273 gst_caps_unref (template_caps);
1275 caps = template_caps;
1277 gst_query_set_caps_result (query, caps);
1278 gst_caps_unref (caps);
1286 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
1295 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1297 GstBaseParseClass *bclass;
1298 GstBaseParse *parse;
1301 parse = GST_BASE_PARSE (parent);
1302 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1304 GST_DEBUG_OBJECT (parse, "%s query", GST_QUERY_TYPE_NAME (query));
1306 if (bclass->sink_query)
1307 ret = bclass->sink_query (parse, query);
1311 GST_LOG_OBJECT (parse, "%s query result: %d %" GST_PTR_FORMAT,
1312 GST_QUERY_TYPE_NAME (query), ret, query);
1318 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
1320 GstBaseParseClass *bclass;
1321 GstBaseParse *parse;
1324 parse = GST_BASE_PARSE (parent);
1325 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1327 GST_DEBUG_OBJECT (parse, "%s query: %" GST_PTR_FORMAT,
1328 GST_QUERY_TYPE_NAME (query), query);
1330 if (bclass->src_query)
1331 ret = bclass->src_query (parse, query);
1335 GST_LOG_OBJECT (parse, "%s query result: %d %" GST_PTR_FORMAT,
1336 GST_QUERY_TYPE_NAME (query), ret, query);
1341 /* gst_base_parse_src_event:
1342 * @pad: #GstPad that received the event.
1343 * @event: #GstEvent that was received.
1345 * Handler for source pad events.
1347 * Returns: TRUE if the event was handled.
1350 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1352 GstBaseParse *parse;
1353 GstBaseParseClass *bclass;
1354 gboolean ret = TRUE;
1356 parse = GST_BASE_PARSE (parent);
1357 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1359 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1360 GST_EVENT_TYPE_NAME (event));
1362 if (bclass->src_event)
1363 ret = bclass->src_event (parse, event);
1365 gst_event_unref (event);
1371 gst_base_parse_is_seekable (GstBaseParse * parse)
1373 /* FIXME: could do more here, e.g. check index or just send data from 0
1374 * in pull mode and let decoder/sink clip */
1375 return parse->priv->syncable;
1378 /* gst_base_parse_src_event_default:
1379 * @parse: #GstBaseParse.
1380 * @event: #GstEvent that was received.
1382 * Default srcpad event handler.
1384 * Returns: TRUE if the event was handled and can be dropped.
1387 gst_base_parse_src_event_default (GstBaseParse * parse, GstEvent * event)
1389 gboolean res = FALSE;
1391 switch (GST_EVENT_TYPE (event)) {
1392 case GST_EVENT_SEEK:
1393 if (gst_base_parse_is_seekable (parse))
1394 res = gst_base_parse_handle_seek (parse, event);
1397 res = gst_pad_event_default (parse->srcpad, GST_OBJECT_CAST (parse),
1406 * gst_base_parse_convert_default:
1407 * @parse: #GstBaseParse.
1408 * @src_format: #GstFormat describing the source format.
1409 * @src_value: Source value to be converted.
1410 * @dest_format: #GstFormat defining the converted format.
1411 * @dest_value: Pointer where the conversion result will be put.
1413 * Default implementation of "convert" vmethod in #GstBaseParse class.
1415 * Returns: TRUE if conversion was successful.
1418 gst_base_parse_convert_default (GstBaseParse * parse,
1419 GstFormat src_format,
1420 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1422 gboolean ret = FALSE;
1423 guint64 bytes, duration;
1425 if (G_UNLIKELY (src_format == dest_format)) {
1426 *dest_value = src_value;
1430 if (G_UNLIKELY (src_value == -1)) {
1435 if (G_UNLIKELY (src_value == 0)) {
1440 /* need at least some frames */
1441 if (!parse->priv->framecount)
1444 duration = parse->priv->acc_duration / GST_MSECOND;
1445 bytes = parse->priv->bytecount;
1447 if (G_UNLIKELY (!duration || !bytes))
1448 goto no_duration_bytes;
1450 if (src_format == GST_FORMAT_BYTES) {
1451 if (dest_format == GST_FORMAT_TIME) {
1452 /* BYTES -> TIME conversion */
1453 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1454 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1455 *dest_value *= GST_MSECOND;
1456 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1457 *dest_value / GST_MSECOND);
1460 GST_DEBUG_OBJECT (parse, "converting bytes -> other not implemented");
1462 } else if (src_format == GST_FORMAT_TIME) {
1463 if (dest_format == GST_FORMAT_BYTES) {
1464 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1465 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1467 GST_DEBUG_OBJECT (parse,
1468 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1469 src_value / GST_MSECOND, *dest_value);
1472 GST_DEBUG_OBJECT (parse, "converting time -> other not implemented");
1474 } else if (src_format == GST_FORMAT_DEFAULT) {
1475 /* DEFAULT == frame-based */
1476 if (dest_format == GST_FORMAT_TIME) {
1477 GST_DEBUG_OBJECT (parse, "converting default -> time");
1478 if (parse->priv->fps_den) {
1479 *dest_value = gst_util_uint64_scale (src_value,
1480 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1484 GST_DEBUG_OBJECT (parse, "converting default -> other not implemented");
1487 GST_DEBUG_OBJECT (parse, "conversion not implemented");
1494 GST_DEBUG_OBJECT (parse, "no framecount");
1499 GST_DEBUG_OBJECT (parse, "no duration %" G_GUINT64_FORMAT ", bytes %"
1500 G_GUINT64_FORMAT, duration, bytes);
1507 gst_base_parse_update_duration (GstBaseParse * baseparse)
1510 GstBaseParse *parse;
1512 parse = GST_BASE_PARSE (baseparse);
1514 peer = gst_pad_get_peer (parse->sinkpad);
1516 gboolean qres = FALSE;
1517 gint64 ptot, dest_value;
1519 qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot);
1520 gst_object_unref (GST_OBJECT (peer));
1522 if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1523 GST_FORMAT_TIME, &dest_value)) {
1525 /* inform if duration changed, but try to avoid spamming */
1526 parse->priv->estimated_drift +=
1527 dest_value - parse->priv->estimated_duration;
1528 if (parse->priv->estimated_drift > GST_SECOND ||
1529 parse->priv->estimated_drift < -GST_SECOND) {
1530 gst_element_post_message (GST_ELEMENT (parse),
1531 gst_message_new_duration_changed (GST_OBJECT (parse)));
1532 parse->priv->estimated_drift = 0;
1534 parse->priv->estimated_duration = dest_value;
1535 GST_LOG_OBJECT (parse,
1536 "updated estimated duration to %" GST_TIME_FORMAT,
1537 GST_TIME_ARGS (dest_value));
1544 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1545 gboolean post_avg, gboolean post_max)
1547 GstTagList *taglist = NULL;
1549 if (post_min && parse->priv->post_min_bitrate) {
1550 taglist = gst_tag_list_new_empty ();
1552 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1553 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1556 if (post_avg && parse->priv->post_avg_bitrate) {
1557 if (taglist == NULL)
1558 taglist = gst_tag_list_new_empty ();
1560 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1561 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1562 parse->priv->avg_bitrate, NULL);
1565 if (post_max && parse->priv->post_max_bitrate) {
1566 if (taglist == NULL)
1567 taglist = gst_tag_list_new_empty ();
1569 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1570 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1573 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1574 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1575 parse->priv->max_bitrate);
1577 if (taglist != NULL) {
1578 gst_pad_push_event (parse->srcpad, gst_event_new_tag (taglist));
1582 /* gst_base_parse_update_bitrates:
1583 * @parse: #GstBaseParse.
1584 * @buffer: Current frame as a #GstBuffer
1586 * Keeps track of the minimum and maximum bitrates, and also maintains a
1587 * running average bitrate of the stream so far.
1590 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1592 /* Only update the tag on a 10 kbps delta */
1593 static const gint update_threshold = 10000;
1595 guint64 data_len, frame_dur;
1596 gint overhead, frame_bitrate, old_avg_bitrate;
1597 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1598 GstBuffer *buffer = frame->buffer;
1600 overhead = frame->overhead;
1604 data_len = gst_buffer_get_size (buffer) - overhead;
1605 parse->priv->data_bytecount += data_len;
1607 /* duration should be valid by now,
1608 * either set by subclass or maybe based on fps settings */
1609 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1610 /* Calculate duration of a frame from buffer properties */
1611 frame_dur = GST_BUFFER_DURATION (buffer);
1612 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1613 parse->priv->acc_duration;
1616 /* No way to figure out frame duration (is this even possible?) */
1620 /* override if subclass provided bitrate, e.g. metadata based */
1621 if (parse->priv->bitrate) {
1622 parse->priv->avg_bitrate = parse->priv->bitrate;
1623 /* spread this (confirmed) info ASAP */
1624 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1625 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1629 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1633 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1634 parse->priv->avg_bitrate);
1636 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1638 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1639 /* always post all at threshold time */
1640 update_min = update_max = update_avg = TRUE;
1643 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1644 if (frame_bitrate < parse->priv->min_bitrate) {
1645 parse->priv->min_bitrate = frame_bitrate;
1649 if (frame_bitrate > parse->priv->max_bitrate) {
1650 parse->priv->max_bitrate = frame_bitrate;
1654 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1655 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1656 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1661 if ((update_min || update_avg || update_max))
1662 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1669 * gst_base_parse_add_index_entry:
1670 * @parse: #GstBaseParse.
1671 * @offset: offset of entry
1672 * @ts: timestamp associated with offset
1673 * @key: whether entry refers to keyframe
1674 * @force: add entry disregarding sanity checks
1676 * Adds an entry to the index associating @offset to @ts. It is recommended
1677 * to only add keyframe entries. @force allows to bypass checks, such as
1678 * whether the stream is (upstream) seekable, another entry is already "close"
1679 * to the new entry, etc.
1681 * Returns: #gboolean indicating whether entry was added
1684 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1685 GstClockTime ts, gboolean key, gboolean force)
1687 gboolean ret = FALSE;
1688 GstIndexAssociation associations[2];
1690 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1691 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1693 if (G_LIKELY (!force)) {
1695 if (!parse->priv->upstream_seekable) {
1696 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1700 /* FIXME need better helper data structure that handles these issues
1701 * related to ongoing collecting of index entries */
1702 if (parse->priv->index_last_offset + parse->priv->idx_byte_interval >=
1704 GST_LOG_OBJECT (parse,
1705 "already have entries up to offset 0x%08" G_GINT64_MODIFIER "x",
1706 parse->priv->index_last_offset + parse->priv->idx_byte_interval);
1710 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1711 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1712 parse->priv->idx_interval) {
1713 GST_LOG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1714 GST_TIME_ARGS (parse->priv->index_last_ts));
1718 /* if last is not really the last one */
1719 if (!parse->priv->index_last_valid) {
1720 GstClockTime prev_ts;
1722 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1723 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1724 GST_LOG_OBJECT (parse,
1725 "entry too close to existing entry %" GST_TIME_FORMAT,
1726 GST_TIME_ARGS (prev_ts));
1727 parse->priv->index_last_offset = offset;
1728 parse->priv->index_last_ts = ts;
1734 associations[0].format = GST_FORMAT_TIME;
1735 associations[0].value = ts;
1736 associations[1].format = GST_FORMAT_BYTES;
1737 associations[1].value = offset;
1739 /* index might change on-the-fly, although that would be nutty app ... */
1740 GST_BASE_PARSE_INDEX_LOCK (parse);
1741 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1742 (key) ? GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT :
1743 GST_INDEX_ASSOCIATION_FLAG_DELTA_UNIT, 2,
1744 (const GstIndexAssociation *) &associations);
1745 GST_BASE_PARSE_INDEX_UNLOCK (parse);
1748 parse->priv->index_last_offset = offset;
1749 parse->priv->index_last_ts = ts;
1758 /* check for seekable upstream, above and beyond a mere query */
1760 gst_base_parse_check_seekability (GstBaseParse * parse)
1763 gboolean seekable = FALSE;
1764 gint64 start = -1, stop = -1;
1765 guint idx_interval = 0;
1766 guint64 idx_byte_interval = 0;
1768 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1769 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1770 GST_DEBUG_OBJECT (parse, "seeking query failed");
1774 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1776 /* try harder to query upstream size if we didn't get it the first time */
1777 if (seekable && stop == -1) {
1778 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1779 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1782 /* if upstream doesn't know the size, it's likely that it's not seekable in
1783 * practice even if it technically may be seekable */
1784 if (seekable && (start != 0 || stop <= start)) {
1785 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1789 /* let's not put every single frame into our index */
1791 if (stop < 10 * 1024 * 1024)
1793 else if (stop < 100 * 1024 * 1024)
1796 idx_interval = 1000;
1798 /* ensure that even for large files (e.g. very long audio files), the index
1799 * stays reasonably-size, with some arbitrary limit to the total number of
1801 idx_byte_interval = (stop - start) / MAX_INDEX_ENTRIES;
1802 GST_DEBUG_OBJECT (parse,
1803 "Limiting index entries to %d, indexing byte interval %"
1804 G_GUINT64_FORMAT " bytes", MAX_INDEX_ENTRIES, idx_byte_interval);
1808 gst_query_unref (query);
1810 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1811 G_GUINT64_FORMAT ")", seekable, start, stop);
1812 parse->priv->upstream_seekable = seekable;
1813 parse->priv->upstream_size = seekable ? stop : 0;
1815 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1816 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1817 parse->priv->idx_byte_interval = idx_byte_interval;
1820 /* some misc checks on upstream */
1822 gst_base_parse_check_upstream (GstBaseParse * parse)
1826 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
1827 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1828 /* upstream has one, accept it also, and no further updates */
1829 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1830 parse->priv->upstream_has_duration = TRUE;
1833 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1834 parse->priv->upstream_has_duration);
1837 /* checks src caps to determine if dealing with audio or video */
1838 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1840 gst_base_parse_check_media (GstBaseParse * parse)
1845 caps = gst_pad_get_current_caps (parse->srcpad);
1846 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1847 parse->priv->is_video =
1848 g_str_has_prefix (gst_structure_get_name (s), "video");
1850 /* historical default */
1851 parse->priv->is_video = FALSE;
1854 gst_caps_unref (caps);
1856 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1859 /* takes ownership of frame */
1861 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1863 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1864 /* frame allocated on the heap, we can just take ownership */
1865 g_queue_push_tail (&parse->priv->queued_frames, frame);
1866 GST_TRACE ("queued frame %p", frame);
1868 GstBaseParseFrame *copy;
1870 /* probably allocated on the stack, must make a proper copy */
1871 copy = gst_base_parse_frame_copy (frame);
1872 g_queue_push_tail (&parse->priv->queued_frames, copy);
1873 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1874 gst_base_parse_frame_free (frame);
1878 /* makes sure that @buf is properly prepared and decorated for passing
1879 * to baseclass, and an equally setup frame is returned setup with @buf.
1880 * Takes ownership of @buf. */
1881 static GstBaseParseFrame *
1882 gst_base_parse_prepare_frame (GstBaseParse * parse, GstBuffer * buffer)
1884 GstBaseParseFrame *frame = NULL;
1886 buffer = gst_buffer_make_writable (buffer);
1888 GST_LOG_OBJECT (parse,
1889 "preparing frame at offset %" G_GUINT64_FORMAT
1890 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
1891 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1892 gst_buffer_get_size (buffer));
1894 if (parse->priv->discont) {
1895 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1896 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1897 parse->priv->discont = FALSE;
1900 GST_BUFFER_OFFSET (buffer) = parse->priv->offset;
1902 frame = gst_base_parse_frame_new (buffer, 0, 0);
1904 /* also ensure to update state flags */
1905 gst_base_parse_frame_update (parse, frame, buffer);
1906 gst_buffer_unref (buffer);
1908 if (parse->priv->prev_offset != parse->priv->offset || parse->priv->new_frame) {
1909 GST_LOG_OBJECT (parse, "marking as new frame");
1910 parse->priv->new_frame = FALSE;
1911 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME;
1914 frame->offset = parse->priv->prev_offset = parse->priv->offset;
1916 /* use default handler to provide initial (upstream) metadata */
1917 gst_base_parse_parse_frame (parse, frame);
1922 /* Wraps buffer in a frame and dispatches to subclass.
1923 * Also manages data skipping and offset handling (including adapter flushing).
1924 * Takes ownership of @buffer */
1925 static GstFlowReturn
1926 gst_base_parse_handle_buffer (GstBaseParse * parse, GstBuffer * buffer,
1927 gint * skip, gint * flushed)
1929 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1930 GstBaseParseFrame *frame;
1933 g_return_val_if_fail (skip != NULL || flushed != NULL, GST_FLOW_ERROR);
1935 GST_LOG_OBJECT (parse,
1936 "handling buffer of size %" G_GSIZE_FORMAT " with dts %" GST_TIME_FORMAT
1937 ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
1938 gst_buffer_get_size (buffer), GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
1939 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
1940 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1942 /* track what is being flushed during this single round of frame processing */
1943 parse->priv->flushed = 0;
1946 /* make it easy for _finish_frame to pick up input data */
1947 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1948 gst_buffer_ref (buffer);
1949 gst_adapter_push (parse->priv->adapter, buffer);
1952 frame = gst_base_parse_prepare_frame (parse, buffer);
1953 ret = klass->handle_frame (parse, frame, skip);
1955 *flushed = parse->priv->flushed;
1957 GST_LOG_OBJECT (parse, "handle_frame skipped %d, flushed %d",
1960 /* subclass can only do one of these, or semantics are too unclear */
1961 g_assert (*skip == 0 || *flushed == 0);
1963 /* track skipping */
1965 GstClockTime pts, dts;
1968 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", *skip);
1969 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
1970 /* reverse playback, and no frames found yet, so we are skipping
1971 * the leading part of a fragment, which may form the tail of
1972 * fragment coming later, hopefully subclass skips efficiently ... */
1973 pts = gst_adapter_prev_pts (parse->priv->adapter, NULL);
1974 dts = gst_adapter_prev_dts (parse->priv->adapter, NULL);
1975 outbuf = gst_adapter_take_buffer (parse->priv->adapter, *skip);
1976 outbuf = gst_buffer_make_writable (outbuf);
1977 GST_BUFFER_PTS (outbuf) = pts;
1978 GST_BUFFER_DTS (outbuf) = dts;
1979 parse->priv->buffers_head =
1980 g_slist_prepend (parse->priv->buffers_head, outbuf);
1983 gst_adapter_flush (parse->priv->adapter, *skip);
1985 if (!parse->priv->discont)
1986 parse->priv->sync_offset = parse->priv->offset;
1987 parse->priv->offset += *skip;
1988 parse->priv->discont = TRUE;
1989 /* check for indefinite skipping */
1990 if (ret == GST_FLOW_OK)
1991 ret = gst_base_parse_check_sync (parse);
1994 parse->priv->offset += *flushed;
1996 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1997 gst_adapter_clear (parse->priv->adapter);
2000 gst_base_parse_frame_free (frame);
2005 /* gst_base_parse_push_pending_events:
2006 * @parse: #GstBaseParse
2008 * Pushes the pending events
2011 gst_base_parse_push_pending_events (GstBaseParse * parse)
2013 if (G_UNLIKELY (parse->priv->pending_events)) {
2014 GList *r = g_list_reverse (parse->priv->pending_events);
2017 parse->priv->pending_events = NULL;
2018 for (l = r; l != NULL; l = l->next) {
2019 gst_pad_push_event (parse->srcpad, GST_EVENT_CAST (l->data));
2022 parse->priv->pending_segment = FALSE;
2026 /* gst_base_parse_handle_and_push_frame:
2027 * @parse: #GstBaseParse.
2028 * @klass: #GstBaseParseClass.
2029 * @frame: (transfer full): a #GstBaseParseFrame
2031 * Parses the frame from given buffer and pushes it forward. Also performs
2032 * timestamp handling and checks the segment limits.
2034 * This is called with srcpad STREAM_LOCK held.
2036 * Returns: #GstFlowReturn
2038 static GstFlowReturn
2039 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
2040 GstBaseParseFrame * frame)
2045 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2047 buffer = frame->buffer;
2048 offset = frame->offset;
2050 /* check if subclass/format can provide ts.
2051 * If so, that allows and enables extra seek and duration determining options */
2052 if (G_UNLIKELY (parse->priv->first_frame_offset < 0)) {
2053 if (GST_BUFFER_PTS_IS_VALID (buffer) && parse->priv->has_timing_info
2054 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
2055 parse->priv->first_frame_offset = offset;
2056 parse->priv->first_frame_pts = GST_BUFFER_PTS (buffer);
2057 parse->priv->first_frame_dts = GST_BUFFER_DTS (buffer);
2058 GST_DEBUG_OBJECT (parse, "subclass provided dts %" GST_TIME_FORMAT
2059 ", pts %" GST_TIME_FORMAT " for first frame at offset %"
2060 G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->first_frame_dts),
2061 GST_TIME_ARGS (parse->priv->first_frame_pts),
2062 parse->priv->first_frame_offset);
2063 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
2065 GstClockTime last_ts = G_MAXINT64;
2067 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
2068 gst_base_parse_locate_time (parse, &last_ts, &off);
2069 if (GST_CLOCK_TIME_IS_VALID (last_ts))
2070 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
2073 /* disable further checks */
2074 parse->priv->first_frame_offset = 0;
2078 /* track upstream time if provided, not subclass' internal notion of it */
2079 if (parse->priv->upstream_format == GST_FORMAT_TIME) {
2080 GST_BUFFER_PTS (frame->buffer) = GST_CLOCK_TIME_NONE;
2081 GST_BUFFER_DTS (frame->buffer) = GST_CLOCK_TIME_NONE;
2084 /* interpolating and no valid pts yet,
2085 * start with dts and carry on from there */
2086 if (parse->priv->infer_ts && parse->priv->pts_interpolate
2087 && !GST_CLOCK_TIME_IS_VALID (parse->priv->next_pts))
2088 parse->priv->next_pts = parse->priv->next_dts;
2090 /* again use default handler to add missing metadata;
2091 * we may have new information on frame properties */
2092 gst_base_parse_parse_frame (parse, frame);
2094 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
2095 if (GST_BUFFER_DTS_IS_VALID (buffer) && GST_BUFFER_DURATION_IS_VALID (buffer)) {
2096 parse->priv->next_dts =
2097 GST_BUFFER_DTS (buffer) + GST_BUFFER_DURATION (buffer);
2098 if (parse->priv->pts_interpolate && GST_BUFFER_PTS_IS_VALID (buffer)) {
2099 GstClockTime next_pts =
2100 GST_BUFFER_PTS (buffer) + GST_BUFFER_DURATION (buffer);
2101 if (next_pts >= parse->priv->next_dts)
2102 parse->priv->next_pts = next_pts;
2105 /* we lost track, do not produce bogus time next time around
2106 * (probably means parser subclass has given up on parsing as well) */
2107 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
2108 parse->priv->next_dts = GST_CLOCK_TIME_NONE;
2111 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
2112 GST_BUFFER_PTS_IS_VALID (buffer))
2113 gst_base_parse_add_index_entry (parse, offset,
2114 GST_BUFFER_PTS (buffer),
2115 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
2117 /* All OK, push queued frames if there are any */
2118 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
2119 GstBaseParseFrame *queued_frame;
2121 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
2122 gst_base_parse_push_frame (parse, queued_frame);
2126 return gst_base_parse_push_frame (parse, frame);
2130 * gst_base_parse_push_frame:
2131 * @parse: #GstBaseParse.
2132 * @frame: (transfer none): a #GstBaseParseFrame
2134 * Pushes the frame's buffer downstream, sends any pending events and
2135 * does some timestamp and segment handling. Takes ownership of
2136 * frame's buffer, though caller retains ownership of @frame.
2138 * This must be called with sinkpad STREAM_LOCK held.
2140 * Returns: #GstFlowReturn
2143 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
2145 GstFlowReturn ret = GST_FLOW_OK;
2146 GstClockTime last_start = GST_CLOCK_TIME_NONE;
2147 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
2148 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
2152 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2153 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
2155 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
2157 buffer = frame->buffer;
2159 GST_LOG_OBJECT (parse,
2160 "processing buffer of size %" G_GSIZE_FORMAT " with dts %" GST_TIME_FORMAT
2161 ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
2162 gst_buffer_get_size (buffer),
2163 GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
2164 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
2165 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
2168 parse->priv->bytecount += frame->size;
2169 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
2170 parse->priv->framecount++;
2171 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
2172 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
2175 /* 0 means disabled */
2176 if (parse->priv->update_interval < 0)
2177 parse->priv->update_interval = 50;
2178 else if (parse->priv->update_interval > 0 &&
2179 (parse->priv->framecount % parse->priv->update_interval) == 0)
2180 gst_base_parse_update_duration (parse);
2182 if (GST_BUFFER_PTS_IS_VALID (buffer))
2183 last_start = last_stop = GST_BUFFER_PTS (buffer);
2184 if (last_start != GST_CLOCK_TIME_NONE
2185 && GST_BUFFER_DURATION_IS_VALID (buffer))
2186 last_stop = last_start + GST_BUFFER_DURATION (buffer);
2188 /* should have caps by now */
2189 if (!gst_pad_has_current_caps (parse->srcpad))
2192 if (G_UNLIKELY (parse->priv->pending_segment)) {
2193 /* have caps; check identity */
2194 gst_base_parse_check_media (parse);
2197 /* Push pending events, including SEGMENT events */
2198 gst_base_parse_push_pending_events (parse);
2200 /* segment adjustment magic; only if we are running the whole show */
2201 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
2202 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
2203 parse->priv->upstream_seekable)) {
2205 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
2206 GST_CLOCK_TIME_IS_VALID (last_start)) {
2207 GstClockTimeDiff diff;
2209 /* only send newsegments with increasing start times,
2210 * otherwise if these go back and forth downstream (sinks) increase
2211 * accumulated time and running_time */
2212 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
2213 if (G_UNLIKELY (diff > 2 * GST_SECOND
2214 && last_start > parse->segment.start
2215 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
2216 || last_start < parse->segment.stop))) {
2218 GST_DEBUG_OBJECT (parse,
2219 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
2220 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
2221 "Sending updated SEGMENT events", diff,
2222 GST_TIME_ARGS (parse->segment.position),
2223 GST_TIME_ARGS (last_start));
2225 /* skip gap FIXME */
2226 gst_pad_push_event (parse->srcpad,
2227 gst_event_new_segment (&parse->segment));
2229 parse->segment.position = last_start;
2234 /* update bitrates and optionally post corresponding tags
2235 * (following newsegment) */
2236 gst_base_parse_update_bitrates (parse, frame);
2238 if (klass->pre_push_frame) {
2239 ret = klass->pre_push_frame (parse, frame);
2241 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
2244 /* take final ownership of frame buffer */
2245 if (frame->out_buffer) {
2246 buffer = frame->out_buffer;
2247 frame->out_buffer = NULL;
2248 gst_buffer_replace (&frame->buffer, NULL);
2250 buffer = frame->buffer;
2251 frame->buffer = NULL;
2254 /* subclass must play nice */
2255 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2257 size = gst_buffer_get_size (buffer);
2259 parse->priv->seen_keyframe |= parse->priv->is_video &&
2260 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
2262 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
2263 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2264 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
2265 GST_BUFFER_TIMESTAMP (buffer) >
2266 parse->segment.stop + parse->priv->lead_out_ts) {
2267 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
2269 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2270 GST_BUFFER_DURATION_IS_VALID (buffer) &&
2271 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
2272 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
2273 parse->priv->lead_in_ts < parse->segment.start) {
2274 if (parse->priv->seen_keyframe) {
2275 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
2278 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
2279 ret = GST_BASE_PARSE_FLOW_DROPPED;
2286 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2287 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2288 gst_buffer_unref (buffer);
2290 } else if (ret == GST_FLOW_OK) {
2291 if (parse->segment.rate > 0.0) {
2292 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2294 ret = gst_pad_push (parse->srcpad, buffer);
2295 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2297 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2299 parse->priv->buffers_queued =
2300 g_slist_prepend (parse->priv->buffers_queued, buffer);
2304 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2305 size, gst_flow_get_name (ret));
2306 gst_buffer_unref (buffer);
2307 /* if we are not sufficiently in control, let upstream decide on EOS */
2308 if (ret == GST_FLOW_EOS && !parse->priv->disable_passthrough &&
2309 (parse->priv->passthrough ||
2310 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2311 !parse->priv->upstream_seekable)))
2315 /* Update current running segment position */
2316 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
2317 parse->segment.position < last_stop)
2318 parse->segment.position = last_stop;
2325 GST_ELEMENT_ERROR (parse, STREAM, DECODE, ("No caps set"), (NULL));
2326 return GST_FLOW_ERROR;
2331 * gst_base_parse_finish_frame:
2332 * @parse: a #GstBaseParse
2333 * @frame: a #GstBaseParseFrame
2334 * @size: consumed input data represented by frame
2336 * Collects parsed data and pushes this downstream.
2337 * Source pad caps must be set when this is called.
2339 * If @frame's out_buffer is set, that will be used as subsequent frame data.
2340 * Otherwise, @size samples will be taken from the input and used for output,
2341 * and the output's metadata (timestamps etc) will be taken as (optionally)
2342 * set by the subclass on @frame's (input) buffer (which is otherwise
2343 * ignored for any but the above purpose/information).
2345 * Note that the latter buffer is invalidated by this call, whereas the
2346 * caller retains ownership of @frame.
2348 * Returns: a #GstFlowReturn that should be escalated to caller (of caller)
2351 gst_base_parse_finish_frame (GstBaseParse * parse, GstBaseParseFrame * frame,
2354 GstFlowReturn ret = GST_FLOW_OK;
2356 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2357 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
2358 g_return_val_if_fail (size > 0 || frame->out_buffer, GST_FLOW_ERROR);
2359 g_return_val_if_fail (gst_adapter_available (parse->priv->adapter) >= size,
2362 GST_LOG_OBJECT (parse, "finished frame at offset %" G_GUINT64_FORMAT ", "
2363 "flushing size %d", frame->offset, size);
2365 /* some one-time start-up */
2366 if (G_UNLIKELY (parse->priv->framecount == 0)) {
2367 gst_base_parse_check_seekability (parse);
2368 gst_base_parse_check_upstream (parse);
2371 parse->priv->flushed += size;
2373 if (parse->priv->scanning && frame->buffer) {
2374 if (!parse->priv->scanned_frame) {
2375 parse->priv->scanned_frame = gst_base_parse_frame_copy (frame);
2380 /* either PUSH or PULL mode arranges for adapter data */
2381 /* ensure output buffer */
2382 if (!frame->out_buffer) {
2383 GstBuffer *src, *dest;
2385 frame->out_buffer = gst_adapter_take_buffer (parse->priv->adapter, size);
2386 dest = frame->out_buffer;
2387 src = frame->buffer;
2388 GST_BUFFER_PTS (dest) = GST_BUFFER_PTS (src);
2389 GST_BUFFER_DTS (dest) = GST_BUFFER_DTS (src);
2390 GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src);
2391 GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src);
2392 GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src);
2393 GST_MINI_OBJECT_FLAGS (dest) = GST_MINI_OBJECT_FLAGS (src);
2395 gst_adapter_flush (parse->priv->adapter, size);
2398 /* use as input for subsequent processing */
2399 gst_buffer_replace (&frame->buffer, frame->out_buffer);
2400 gst_buffer_unref (frame->out_buffer);
2401 frame->out_buffer = NULL;
2403 /* mark input size consumed */
2406 /* subclass might queue frames/data internally if it needs more
2407 * frames to decide on the format, or might request us to queue here. */
2408 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_DROP) {
2409 gst_buffer_replace (&frame->buffer, NULL);
2411 } else if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_QUEUE) {
2412 GstBaseParseFrame *copy;
2414 copy = gst_base_parse_frame_copy (frame);
2415 copy->flags &= ~GST_BASE_PARSE_FRAME_FLAG_QUEUE;
2416 gst_base_parse_queue_frame (parse, copy);
2420 ret = gst_base_parse_handle_and_push_frame (parse, frame);
2426 /* gst_base_parse_drain:
2428 * Drains the adapter until it is empty. It decreases the min_frame_size to
2429 * match the current adapter size and calls chain method until the adapter
2430 * is emptied or chain returns with error.
2433 gst_base_parse_drain (GstBaseParse * parse)
2437 GST_DEBUG_OBJECT (parse, "draining");
2438 parse->priv->drain = TRUE;
2441 avail = gst_adapter_available (parse->priv->adapter);
2445 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2446 NULL) != GST_FLOW_OK) {
2450 /* nothing changed, maybe due to truncated frame; break infinite loop */
2451 if (avail == gst_adapter_available (parse->priv->adapter)) {
2452 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2453 gst_adapter_clear (parse->priv->adapter);
2457 parse->priv->drain = FALSE;
2460 /* gst_base_parse_send_buffers
2462 * Sends buffers collected in send_buffers downstream, and ensures that list
2463 * is empty at the end (errors or not).
2465 static GstFlowReturn
2466 gst_base_parse_send_buffers (GstBaseParse * parse)
2468 GSList *send = NULL;
2470 GstFlowReturn ret = GST_FLOW_OK;
2472 send = parse->priv->buffers_send;
2476 buf = GST_BUFFER_CAST (send->data);
2477 GST_LOG_OBJECT (parse, "pushing buffer %p, dts %"
2478 GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2479 ", offset %" G_GINT64_FORMAT, buf,
2480 GST_TIME_ARGS (GST_BUFFER_DTS (buf)),
2481 GST_TIME_ARGS (GST_BUFFER_PTS (buf)),
2482 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2484 /* iterate output queue an push downstream */
2485 ret = gst_pad_push (parse->srcpad, buf);
2486 send = g_slist_delete_link (send, send);
2488 /* clear any leftover if error */
2489 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2491 buf = GST_BUFFER_CAST (send->data);
2492 gst_buffer_unref (buf);
2493 send = g_slist_delete_link (send, send);
2498 parse->priv->buffers_send = send;
2503 /* gst_base_parse_start_fragment:
2505 * Prepares for processing a reverse playback (forward) fragment
2506 * by (re)setting proper state variables.
2508 static GstFlowReturn
2509 gst_base_parse_start_fragment (GstBaseParse * parse)
2511 GST_LOG_OBJECT (parse, "starting fragment");
2513 /* invalidate so no fall-back timestamping is performed;
2514 * ok if taken from subclass or upstream */
2515 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
2516 parse->priv->prev_pts = GST_CLOCK_TIME_NONE;
2517 parse->priv->next_dts = GST_CLOCK_TIME_NONE;
2518 parse->priv->prev_dts = GST_CLOCK_TIME_NONE;
2519 /* prevent it hanging around stop all the time */
2520 parse->segment.position = GST_CLOCK_TIME_NONE;
2522 parse->priv->discont = TRUE;
2524 /* head of previous fragment is now pending tail of current fragment */
2525 parse->priv->buffers_pending = parse->priv->buffers_head;
2526 parse->priv->buffers_head = NULL;
2532 /* gst_base_parse_finish_fragment:
2534 * Processes a reverse playback (forward) fragment:
2535 * - append head of last fragment that was skipped to current fragment data
2536 * - drain the resulting current fragment data (i.e. repeated chain)
2537 * - add time/duration (if needed) to frames queued by chain
2538 * - push queued data
2540 static GstFlowReturn
2541 gst_base_parse_finish_fragment (GstBaseParse * parse, gboolean prev_head)
2544 GstFlowReturn ret = GST_FLOW_OK;
2545 gboolean seen_key = FALSE, seen_delta = FALSE;
2547 GST_LOG_OBJECT (parse, "finishing fragment");
2550 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2551 while (parse->priv->buffers_pending) {
2552 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2554 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2555 gst_buffer_get_size (buf));
2556 gst_adapter_push (parse->priv->adapter, buf);
2558 GST_LOG_OBJECT (parse, "discarding head buffer");
2559 gst_buffer_unref (buf);
2561 parse->priv->buffers_pending =
2562 g_slist_delete_link (parse->priv->buffers_pending,
2563 parse->priv->buffers_pending);
2566 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2567 /* initial skipped data is added to buffers_pending */
2568 gst_base_parse_drain (parse);
2570 if (parse->priv->buffers_send) {
2571 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2572 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2575 /* add metadata (if needed to queued buffers */
2576 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2577 GST_TIME_ARGS (parse->priv->last_pts));
2578 while (parse->priv->buffers_queued) {
2579 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2581 /* no touching if upstream or parsing provided time */
2582 if (GST_BUFFER_PTS_IS_VALID (buf)) {
2583 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2584 GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
2585 } else if (GST_BUFFER_DURATION_IS_VALID (buf)) {
2586 if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_pts)) {
2587 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_pts))
2588 parse->priv->last_pts -= GST_BUFFER_DURATION (buf);
2590 parse->priv->last_pts = 0;
2591 GST_BUFFER_PTS (buf) = parse->priv->last_pts;
2592 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2593 GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
2595 if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_dts)) {
2596 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_dts))
2597 parse->priv->last_dts -= GST_BUFFER_DURATION (buf);
2599 parse->priv->last_dts = 0;
2600 GST_BUFFER_DTS (buf) = parse->priv->last_dts;
2601 GST_LOG_OBJECT (parse, "applied dts %" GST_TIME_FORMAT,
2602 GST_TIME_ARGS (GST_BUFFER_DTS (buf)));
2605 /* no idea, very bad */
2606 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2609 parse->priv->last_pts = GST_BUFFER_PTS (buf);
2610 parse->priv->last_dts = GST_BUFFER_DTS (buf);
2612 /* reverse order for ascending sending */
2613 /* send downstream at keyframe not preceded by a keyframe
2614 * (e.g. that should identify start of collection of IDR nals) */
2615 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2617 ret = gst_base_parse_send_buffers (parse);
2618 /* if a problem, throw all to sending */
2619 if (ret != GST_FLOW_OK) {
2620 parse->priv->buffers_send =
2621 g_slist_reverse (parse->priv->buffers_queued);
2622 parse->priv->buffers_queued = NULL;
2632 parse->priv->buffers_send =
2633 g_slist_prepend (parse->priv->buffers_send, buf);
2634 parse->priv->buffers_queued =
2635 g_slist_delete_link (parse->priv->buffers_queued,
2636 parse->priv->buffers_queued);
2639 /* audio may have all marked as keyframe, so arrange to send here */
2641 ret = gst_base_parse_send_buffers (parse);
2643 /* any trailing unused no longer usable (ideally none) */
2644 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2645 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2646 gst_adapter_available (parse->priv->adapter));
2647 gst_adapter_clear (parse->priv->adapter);
2653 /* small helper that checks whether we have been trying to resync too long */
2654 static inline GstFlowReturn
2655 gst_base_parse_check_sync (GstBaseParse * parse)
2657 if (G_UNLIKELY (parse->priv->discont &&
2658 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2659 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2660 ("Failed to parse stream"), (NULL));
2661 return GST_FLOW_ERROR;
2667 static GstFlowReturn
2668 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
2670 GstBaseParseClass *bclass;
2671 GstBaseParse *parse;
2672 GstFlowReturn ret = GST_FLOW_OK;
2673 GstBuffer *tmpbuf = NULL;
2678 GstClockTime pts, dts;
2680 parse = GST_BASE_PARSE (parent);
2681 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2683 if (parse->priv->detecting) {
2684 GstBuffer *detect_buf;
2686 if (parse->priv->detect_buffers_size == 0) {
2687 detect_buf = gst_buffer_ref (buffer);
2692 detect_buf = gst_buffer_new ();
2694 for (l = parse->priv->detect_buffers; l; l = l->next) {
2695 gsize tmpsize = gst_buffer_get_size (l->data);
2697 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
2698 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
2702 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
2703 offset, gst_buffer_get_size (buffer));
2706 ret = bclass->detect (parse, detect_buf);
2707 gst_buffer_unref (detect_buf);
2709 if (ret == GST_FLOW_OK) {
2712 /* Detected something */
2713 parse->priv->detecting = FALSE;
2715 for (l = parse->priv->detect_buffers; l; l = l->next) {
2716 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2718 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2719 parent, GST_BUFFER_CAST (l->data));
2721 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2723 g_list_free (parse->priv->detect_buffers);
2724 parse->priv->detect_buffers = NULL;
2725 parse->priv->detect_buffers_size = 0;
2727 if (ret != GST_FLOW_OK) {
2731 /* Handle the current buffer */
2732 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2733 /* Still detecting, append buffer or error out if draining */
2735 if (parse->priv->drain) {
2736 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2737 return GST_FLOW_ERROR;
2738 } else if (parse->priv->flushing) {
2739 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2741 g_list_free (parse->priv->detect_buffers);
2742 parse->priv->detect_buffers = NULL;
2743 parse->priv->detect_buffers_size = 0;
2745 parse->priv->detect_buffers =
2746 g_list_append (parse->priv->detect_buffers, buffer);
2747 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
2751 /* Something went wrong, subclass responsible for error reporting */
2755 /* And now handle the current buffer if detection worked */
2758 if (G_LIKELY (buffer)) {
2759 GST_LOG_OBJECT (parse,
2760 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT
2761 ", dts %" GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT,
2762 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer),
2763 GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
2764 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)));
2766 if (G_UNLIKELY (!parse->priv->disable_passthrough
2767 && parse->priv->passthrough)) {
2768 GstBaseParseFrame frame;
2770 gst_base_parse_frame_init (&frame);
2771 frame.buffer = gst_buffer_make_writable (buffer);
2772 ret = gst_base_parse_push_frame (parse, &frame);
2773 gst_base_parse_frame_free (&frame);
2776 /* upstream feeding us in reverse playback;
2777 * finish previous fragment and start new upon DISCONT */
2778 if (parse->segment.rate < 0.0) {
2779 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2780 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2781 ret = gst_base_parse_finish_fragment (parse, TRUE);
2782 gst_base_parse_start_fragment (parse);
2785 gst_adapter_push (parse->priv->adapter, buffer);
2788 /* Parse and push as many frames as possible */
2789 /* Stop either when adapter is empty or we are flushing */
2790 while (!parse->priv->flushing) {
2793 /* note: if subclass indicates MAX fsize,
2794 * this will not likely be available anyway ... */
2795 min_size = MAX (parse->priv->min_frame_size, fsize);
2796 av = gst_adapter_available (parse->priv->adapter);
2798 if (G_UNLIKELY (parse->priv->drain)) {
2800 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2801 if (G_UNLIKELY (!min_size)) {
2806 /* Collect at least min_frame_size bytes */
2807 if (av < min_size) {
2808 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)", av);
2812 /* move along with upstream timestamp (if any),
2813 * but interpolate in between */
2814 pts = gst_adapter_prev_pts (parse->priv->adapter, NULL);
2815 dts = gst_adapter_prev_dts (parse->priv->adapter, NULL);
2816 if (GST_CLOCK_TIME_IS_VALID (pts) && (parse->priv->prev_pts != pts))
2817 parse->priv->prev_pts = parse->priv->next_pts = pts;
2819 if (GST_CLOCK_TIME_IS_VALID (dts) && (parse->priv->prev_dts != dts))
2820 parse->priv->prev_dts = parse->priv->next_dts = dts;
2822 /* we can mess with, erm interpolate, timestamps,
2823 * and incoming stuff has PTS but no DTS seen so far,
2824 * then pick up DTS from PTS and hope for the best ... */
2825 if (parse->priv->infer_ts &&
2826 parse->priv->pts_interpolate &&
2827 !GST_CLOCK_TIME_IS_VALID (dts) &&
2828 !GST_CLOCK_TIME_IS_VALID (parse->priv->prev_dts) &&
2829 GST_CLOCK_TIME_IS_VALID (pts))
2830 parse->priv->next_dts = pts;
2832 /* always pass all available data */
2833 data = gst_adapter_map (parse->priv->adapter, av);
2834 /* arrange for actual data to be copied if subclass tries to,
2835 * since what is passed is tied to the adapter */
2836 tmpbuf = gst_buffer_new_wrapped_full (GST_MEMORY_FLAG_READONLY |
2837 GST_MEMORY_FLAG_NO_SHARE, (gpointer) data, av, 0, av, NULL, NULL);
2839 /* already inform subclass what timestamps we have planned,
2840 * at least if provided by time-based upstream */
2841 if (parse->priv->upstream_format == GST_FORMAT_TIME) {
2842 GST_BUFFER_PTS (tmpbuf) = parse->priv->next_pts;
2843 GST_BUFFER_DTS (tmpbuf) = parse->priv->next_dts;
2846 /* keep the adapter mapped, so keep track of what has to be flushed */
2847 ret = gst_base_parse_handle_buffer (parse, tmpbuf, &skip, &flush);
2850 /* probably already implicitly unmapped due to adapter operation,
2851 * but for good measure ... */
2852 gst_adapter_unmap (parse->priv->adapter);
2853 if (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED) {
2856 if (skip == 0 && flush == 0) {
2857 GST_LOG_OBJECT (parse, "nothing skipped and no frames finished, "
2858 "breaking to get more data");
2864 GST_LOG_OBJECT (parse, "chain leaving");
2868 /* pull @size bytes at current offset,
2869 * i.e. at least try to and possibly return a shorter buffer if near the end */
2870 static GstFlowReturn
2871 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2872 GstBuffer ** buffer)
2874 GstFlowReturn ret = GST_FLOW_OK;
2876 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2878 /* Caching here actually makes much less difference than one would expect.
2879 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2880 if (parse->priv->cache) {
2881 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2882 gint cache_size = gst_buffer_get_size (parse->priv->cache);
2884 if (cache_offset <= parse->priv->offset &&
2885 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2886 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
2887 parse->priv->offset - cache_offset, size);
2888 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2891 /* not enough data in the cache, free cache and get a new one */
2892 gst_buffer_unref (parse->priv->cache);
2893 parse->priv->cache = NULL;
2896 /* refill the cache */
2898 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2899 64 * 1024), &parse->priv->cache);
2900 if (ret != GST_FLOW_OK) {
2901 parse->priv->cache = NULL;
2905 if (gst_buffer_get_size (parse->priv->cache) >= size) {
2907 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
2909 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2913 /* Not possible to get enough data, try a last time with
2914 * requesting exactly the size we need */
2915 gst_buffer_unref (parse->priv->cache);
2916 parse->priv->cache = NULL;
2918 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2919 &parse->priv->cache);
2921 if (ret != GST_FLOW_OK) {
2922 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2927 if (gst_buffer_get_size (parse->priv->cache) < size) {
2928 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2929 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
2930 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
2932 *buffer = parse->priv->cache;
2933 parse->priv->cache = NULL;
2939 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
2940 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2945 static GstFlowReturn
2946 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2949 GstClockTime ts = 0;
2953 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2954 ", last_offset = %" G_GINT64_FORMAT,
2955 GST_TIME_ARGS (parse->priv->last_pts), parse->priv->last_offset);
2957 if (!parse->priv->last_offset
2958 || parse->priv->last_pts <= parse->segment.start) {
2959 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2960 GST_TIME_ARGS (parse->segment.start));
2965 /* last fragment started at last_offset / last_ts;
2966 * seek back 10s capped at 1MB */
2967 if (parse->priv->last_pts >= 10 * GST_SECOND)
2968 ts = parse->priv->last_pts - 10 * GST_SECOND;
2969 /* if we are exact now, we will be more so going backwards */
2970 if (parse->priv->exact_position) {
2971 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2973 if (!gst_base_parse_convert (parse, GST_FORMAT_TIME, ts,
2974 GST_FORMAT_BYTES, &offset)) {
2975 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2978 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2979 parse->priv->last_offset - 1024);
2980 offset = MAX (0, offset);
2982 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2984 parse->priv->offset = offset;
2986 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2988 if (ret != GST_FLOW_OK)
2991 /* offset will increase again as fragment is processed/parsed */
2992 parse->priv->last_offset = offset;
2994 gst_base_parse_start_fragment (parse);
2995 gst_adapter_push (parse->priv->adapter, buffer);
2996 ret = gst_base_parse_finish_fragment (parse, TRUE);
2997 if (ret != GST_FLOW_OK)
3000 /* force previous fragment */
3001 parse->priv->offset = -1;
3008 * pull and scan for next frame starting from current offset
3009 * ajusts sync, drain and offset going along */
3010 static GstFlowReturn
3011 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass)
3014 GstFlowReturn ret = GST_FLOW_OK;
3015 guint fsize, min_size;
3019 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
3020 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
3022 /* let's make this efficient for all subclass once and for all;
3023 * maybe it does not need this much, but in the latter case, we know we are
3024 * in pull mode here and might as well try to read and supply more anyway
3025 * (so does the buffer caching mechanism) */
3029 min_size = MAX (parse->priv->min_frame_size, fsize);
3031 GST_LOG_OBJECT (parse, "reading buffer size %u", min_size);
3033 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
3034 if (ret != GST_FLOW_OK)
3037 /* if we got a short read, inform subclass we are draining leftover
3038 * and no more is to be expected */
3039 if (gst_buffer_get_size (buffer) < min_size) {
3040 GST_LOG_OBJECT (parse, "... but did not get that; marked draining");
3041 parse->priv->drain = TRUE;
3044 if (parse->priv->detecting) {
3045 ret = klass->detect (parse, buffer);
3046 if (ret == GST_FLOW_NOT_NEGOTIATED) {
3047 /* If draining we error out, otherwise request a buffer
3049 if (parse->priv->drain) {
3050 gst_buffer_unref (buffer);
3051 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
3052 return GST_FLOW_ERROR;
3055 gst_buffer_unref (buffer);
3058 } else if (ret != GST_FLOW_OK) {
3059 gst_buffer_unref (buffer);
3060 GST_ERROR_OBJECT (parse, "detect() returned %s",
3061 gst_flow_get_name (ret));
3065 /* Else handle this buffer normally */
3068 ret = gst_base_parse_handle_buffer (parse, buffer, &skip, &flushed);
3069 if (ret != GST_FLOW_OK)
3072 /* something flushed means something happened,
3073 * and we should bail out of this loop so as not to occupy
3074 * the task thread indefinitely */
3076 GST_LOG_OBJECT (parse, "frame finished, breaking loop");
3079 /* nothing flushed, no skip and draining, so nothing left to do */
3080 if (!skip && parse->priv->drain) {
3081 GST_LOG_OBJECT (parse, "no activity or result when draining; "
3082 "breaking loop and marking EOS");
3086 /* otherwise, get some more data
3087 * note that is checked this does not happen indefinitely */
3089 GST_LOG_OBJECT (parse, "getting some more data");
3092 parse->priv->drain = FALSE;
3099 /* Loop that is used in pull mode to retrieve data from upstream */
3101 gst_base_parse_loop (GstPad * pad)
3103 GstBaseParse *parse;
3104 GstBaseParseClass *klass;
3105 GstFlowReturn ret = GST_FLOW_OK;
3107 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
3108 klass = GST_BASE_PARSE_GET_CLASS (parse);
3110 GST_LOG_OBJECT (parse, "Entering parse loop");
3112 if (G_UNLIKELY (parse->priv->push_stream_start)) {
3117 gst_pad_create_stream_id (parse->srcpad, GST_ELEMENT_CAST (parse),
3120 event = gst_event_new_stream_start (stream_id);
3121 gst_event_set_group_id (event, gst_util_group_id_next ());
3123 GST_DEBUG_OBJECT (parse, "Pushing STREAM_START");
3124 gst_pad_push_event (parse->srcpad, event);
3125 parse->priv->push_stream_start = FALSE;
3129 /* reverse playback:
3130 * first fragment (closest to stop time) is handled normally below,
3131 * then we pull in fragments going backwards */
3132 if (parse->segment.rate < 0.0) {
3133 /* check if we jumped back to a previous fragment,
3134 * which is a post-first fragment */
3135 if (parse->priv->offset < 0) {
3136 ret = gst_base_parse_handle_previous_fragment (parse);
3141 ret = gst_base_parse_scan_frame (parse, klass);
3142 if (ret != GST_FLOW_OK)
3145 /* eat expected eos signalling past segment in reverse playback */
3146 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
3147 parse->segment.position >= parse->segment.stop) {
3148 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
3149 /* push what was accumulated during loop run */
3150 gst_base_parse_finish_fragment (parse, FALSE);
3151 /* force previous fragment */
3152 parse->priv->offset = -1;
3157 if (ret == GST_FLOW_EOS)
3159 else if (ret != GST_FLOW_OK)
3162 gst_object_unref (parse);
3169 GST_DEBUG_OBJECT (parse, "eos");
3174 gboolean push_eos = FALSE;
3176 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
3177 gst_flow_get_name (ret));
3178 gst_pad_pause_task (parse->sinkpad);
3180 if (ret == GST_FLOW_EOS) {
3181 /* handle end-of-stream/segment */
3182 if (parse->segment.flags & GST_SEGMENT_FLAG_SEGMENT) {
3185 if ((stop = parse->segment.stop) == -1)
3186 stop = parse->segment.duration;
3188 GST_DEBUG_OBJECT (parse, "sending segment_done");
3190 gst_element_post_message
3191 (GST_ELEMENT_CAST (parse),
3192 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
3193 GST_FORMAT_TIME, stop));
3194 gst_pad_push_event (parse->srcpad,
3195 gst_event_new_segment_done (GST_FORMAT_TIME, stop));
3197 /* If we STILL have zero frames processed, fire an error */
3198 if (parse->priv->framecount == 0) {
3199 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
3200 ("No valid frames found before end of stream"), (NULL));
3204 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
3205 /* for fatal errors we post an error message, wrong-state is
3206 * not fatal because it happens due to flushes and only means
3207 * that we should stop now. */
3208 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
3209 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
3213 /* Push pending events, including SEGMENT events */
3214 gst_base_parse_push_pending_events (parse);
3216 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
3218 gst_object_unref (parse);
3223 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
3225 GstSchedulingFlags sched_flags;
3226 GstBaseParse *parse;
3230 parse = GST_BASE_PARSE (parent);
3232 GST_DEBUG_OBJECT (parse, "sink activate");
3234 query = gst_query_new_scheduling ();
3235 if (!gst_pad_peer_query (sinkpad, query)) {
3236 gst_query_unref (query);
3237 goto baseparse_push;
3240 gst_query_parse_scheduling (query, &sched_flags, NULL, NULL, NULL);
3242 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL)
3243 && ((sched_flags & GST_SCHEDULING_FLAG_SEEKABLE) != 0);
3245 gst_query_unref (query);
3248 goto baseparse_push;
3250 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
3251 if (!gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE))
3252 goto baseparse_push;
3254 parse->priv->push_stream_start = TRUE;
3256 return gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop,
3261 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
3262 return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
3267 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
3269 GstBaseParseClass *klass;
3270 gboolean result = TRUE;
3272 GST_DEBUG_OBJECT (parse, "activate %d", active);
3274 klass = GST_BASE_PARSE_GET_CLASS (parse);
3277 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
3278 result = klass->start (parse);
3280 /* If the subclass implements ::detect we want to
3281 * call it for the first buffers now */
3282 parse->priv->detecting = (klass->detect != NULL);
3284 /* We must make sure streaming has finished before resetting things
3285 * and calling the ::stop vfunc */
3286 GST_PAD_STREAM_LOCK (parse->sinkpad);
3287 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3289 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
3290 result = klass->stop (parse);
3292 parse->priv->pad_mode = GST_PAD_MODE_NONE;
3294 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
3299 gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
3300 GstPadMode mode, gboolean active)
3303 GstBaseParse *parse;
3305 parse = GST_BASE_PARSE (parent);
3307 GST_DEBUG_OBJECT (parse, "sink %sactivate in %s mode",
3308 (active) ? "" : "de", gst_pad_mode_get_name (mode));
3310 if (!gst_base_parse_activate (parse, active))
3311 goto activate_failed;
3314 case GST_PAD_MODE_PULL:
3316 parse->priv->pending_events =
3317 g_list_prepend (parse->priv->pending_events,
3318 gst_event_new_segment (&parse->segment));
3319 parse->priv->pending_segment = TRUE;
3322 result = gst_pad_stop_task (pad);
3330 parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
3332 GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
3339 GST_DEBUG_OBJECT (parse, "activate failed");
3345 * gst_base_parse_set_duration:
3346 * @parse: #GstBaseParse.
3348 * @duration: duration value.
3349 * @interval: how often to update the duration estimate based on bitrate, or 0.
3351 * Sets the duration of the currently playing media. Subclass can use this
3352 * when it is able to determine duration and/or notices a change in the media
3353 * duration. Alternatively, if @interval is non-zero (default), then stream
3354 * duration is determined based on estimated bitrate, and updated every @interval
3358 gst_base_parse_set_duration (GstBaseParse * parse,
3359 GstFormat fmt, gint64 duration, gint interval)
3361 g_return_if_fail (parse != NULL);
3363 if (parse->priv->upstream_has_duration) {
3364 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3368 if (duration != parse->priv->duration) {
3371 m = gst_message_new_duration_changed (GST_OBJECT (parse));
3372 gst_element_post_message (GST_ELEMENT (parse), m);
3374 /* TODO: what about duration tag? */
3376 parse->priv->duration = duration;
3377 parse->priv->duration_fmt = fmt;
3378 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3379 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3380 if (interval != 0) {
3381 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3385 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3386 parse->priv->update_interval = interval;
3392 * gst_base_parse_set_average_bitrate:
3393 * @parse: #GstBaseParse.
3394 * @bitrate: average bitrate in bits/second
3396 * Optionally sets the average bitrate detected in media (if non-zero),
3397 * e.g. based on metadata, as it will be posted to the application.
3399 * By default, announced average bitrate is estimated. The average bitrate
3400 * is used to estimate the total duration of the stream and to estimate
3401 * a seek position, if there's no index and the format is syncable
3402 * (see gst_base_parse_set_syncable()).
3405 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3407 parse->priv->bitrate = bitrate;
3408 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3412 * gst_base_parse_set_min_frame_size:
3413 * @parse: #GstBaseParse.
3414 * @min_size: Minimum size of the data that this base class should give to
3417 * Subclass can use this function to tell the base class that it needs to
3418 * give at least #min_size buffers.
3421 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3423 g_return_if_fail (parse != NULL);
3425 parse->priv->min_frame_size = min_size;
3426 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3430 * gst_base_parse_set_frame_rate:
3431 * @parse: the #GstBaseParse to set
3432 * @fps_num: frames per second (numerator).
3433 * @fps_den: frames per second (denominator).
3434 * @lead_in: frames needed before a segment for subsequent decode
3435 * @lead_out: frames needed after a segment
3437 * If frames per second is configured, parser can take care of buffer duration
3438 * and timestamping. When performing segment clipping, or seeking to a specific
3439 * location, a corresponding decoder might need an initial @lead_in and a
3440 * following @lead_out number of frames to ensure the desired segment is
3441 * entirely filled upon decoding.
3444 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3445 guint fps_den, guint lead_in, guint lead_out)
3447 g_return_if_fail (parse != NULL);
3449 parse->priv->fps_num = fps_num;
3450 parse->priv->fps_den = fps_den;
3451 if (!fps_num || !fps_den) {
3452 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3454 fps_num = fps_den = 0;
3455 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3456 parse->priv->lead_in = parse->priv->lead_out = 0;
3457 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3459 parse->priv->frame_duration =
3460 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3461 parse->priv->lead_in = lead_in;
3462 parse->priv->lead_out = lead_out;
3463 parse->priv->lead_in_ts =
3464 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3465 parse->priv->lead_out_ts =
3466 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3467 /* aim for about 1.5s to estimate duration */
3468 if (parse->priv->update_interval < 0) {
3469 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3470 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3471 parse->priv->update_interval);
3474 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3475 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3476 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3477 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3478 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3479 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3483 * gst_base_parse_set_has_timing_info:
3484 * @parse: a #GstBaseParse
3485 * @has_timing: whether frames carry timing information
3487 * Set if frames carry timing information which the subclass can (generally)
3488 * parse and provide. In particular, intrinsic (rather than estimated) time
3489 * can be obtained following a seek.
3492 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3494 parse->priv->has_timing_info = has_timing;
3495 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3499 * gst_base_parse_set_syncable:
3500 * @parse: a #GstBaseParse
3501 * @syncable: set if frame starts can be identified
3503 * Set if frame starts can be identified. This is set by default and
3504 * determines whether seeking based on bitrate averages
3505 * is possible for a format/stream.
3508 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3510 parse->priv->syncable = syncable;
3511 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3515 * gst_base_parse_set_passthrough:
3516 * @parse: a #GstBaseParse
3517 * @passthrough: %TRUE if parser should run in passthrough mode
3519 * Set if the nature of the format or configuration does not allow (much)
3520 * parsing, and the parser should operate in passthrough mode (which only
3521 * applies when operating in push mode). That is, incoming buffers are
3522 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3523 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3524 * so subclass can perform as much or as little is appropriate for
3525 * passthrough semantics in @pre_push_frame.
3528 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3530 parse->priv->passthrough = passthrough;
3531 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3535 * gst_base_parse_set_pts_interpolation:
3536 * @parse: a #GstBaseParse
3537 * @pts_interpolate: %TRUE if parser should interpolate PTS timestamps
3539 * By default, the base class will guess PTS timestamps using a simple
3540 * interpolation (previous timestamp + duration), which is incorrect for
3541 * data streams with reordering, where PTS can go backward. Sub-classes
3542 * implementing such formats should disable PTS interpolation.
3545 gst_base_parse_set_pts_interpolation (GstBaseParse * parse,
3546 gboolean pts_interpolate)
3548 parse->priv->pts_interpolate = pts_interpolate;
3549 GST_INFO_OBJECT (parse, "PTS interpolation: %s",
3550 (pts_interpolate) ? "yes" : "no");
3554 * gst_base_parse_set_infer_ts:
3555 * @parse: a #GstBaseParse
3556 * @infer_ts: %TRUE if parser should infer DTS/PTS from each other
3558 * By default, the base class might try to infer PTS from DTS and vice
3559 * versa. While this is generally correct for audio data, it may not
3560 * be otherwise. Sub-classes implementing such formats should disable
3561 * timestamp inferring.
3564 gst_base_parse_set_infer_ts (GstBaseParse * parse, gboolean infer_ts)
3566 parse->priv->infer_ts = infer_ts;
3567 GST_INFO_OBJECT (parse, "TS inferring: %s", (infer_ts) ? "yes" : "no");
3571 * gst_base_parse_set_latency:
3572 * @parse: a #GstBaseParse
3573 * @min_latency: minimum parse latency
3574 * @max_latency: maximum parse latency
3576 * Sets the minimum and maximum (which may likely be equal) latency introduced
3577 * by the parsing process. If there is such a latency, which depends on the
3578 * particular parsing of the format, it typically corresponds to 1 frame duration.
3581 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3582 GstClockTime max_latency)
3584 GST_OBJECT_LOCK (parse);
3585 parse->priv->min_latency = min_latency;
3586 parse->priv->max_latency = max_latency;
3587 GST_OBJECT_UNLOCK (parse);
3588 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3589 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3590 GST_TIME_ARGS (max_latency));
3594 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3595 GstClockTime * duration)
3597 gboolean res = FALSE;
3599 g_return_val_if_fail (duration != NULL, FALSE);
3601 *duration = GST_CLOCK_TIME_NONE;
3602 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3603 GST_LOG_OBJECT (parse, "using provided duration");
3604 *duration = parse->priv->duration;
3606 } else if (parse->priv->duration != -1) {
3607 GST_LOG_OBJECT (parse, "converting provided duration");
3608 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3609 parse->priv->duration, format, (gint64 *) duration);
3610 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3611 GST_LOG_OBJECT (parse, "using estimated duration");
3612 *duration = parse->priv->estimated_duration;
3615 GST_LOG_OBJECT (parse, "cannot estimate duration");
3618 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3619 GST_TIME_ARGS (*duration));
3624 gst_base_parse_src_query_default (GstBaseParse * parse, GstQuery * query)
3626 gboolean res = FALSE;
3629 pad = GST_BASE_PARSE_SRC_PAD (parse);
3631 switch (GST_QUERY_TYPE (query)) {
3632 case GST_QUERY_POSITION:
3637 GST_DEBUG_OBJECT (parse, "position query");
3638 gst_query_parse_position (query, &format, NULL);
3640 /* try upstream first */
3641 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
3643 /* Fall back on interpreting segment */
3644 GST_OBJECT_LOCK (parse);
3645 if (format == GST_FORMAT_BYTES) {
3646 dest_value = parse->priv->offset;
3648 } else if (format == parse->segment.format &&
3649 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
3650 dest_value = gst_segment_to_stream_time (&parse->segment,
3651 parse->segment.format, parse->segment.position);
3654 GST_OBJECT_UNLOCK (parse);
3656 /* no precise result, upstream no idea either, then best estimate */
3657 /* priv->offset is updated in both PUSH/PULL modes */
3658 res = gst_base_parse_convert (parse,
3659 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3662 gst_query_set_position (query, format, dest_value);
3666 case GST_QUERY_DURATION:
3669 GstClockTime duration;
3671 GST_DEBUG_OBJECT (parse, "duration query");
3672 gst_query_parse_duration (query, &format, NULL);
3674 /* consult upstream */
3675 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
3677 /* otherwise best estimate from us */
3679 res = gst_base_parse_get_duration (parse, format, &duration);
3681 gst_query_set_duration (query, format, duration);
3685 case GST_QUERY_SEEKING:
3688 GstClockTime duration = GST_CLOCK_TIME_NONE;
3689 gboolean seekable = FALSE;
3691 GST_DEBUG_OBJECT (parse, "seeking query");
3692 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3694 /* consult upstream */
3695 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
3697 /* we may be able to help if in TIME */
3698 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3699 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3700 /* already OK if upstream takes care */
3701 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3703 if (!(res && seekable)) {
3704 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3705 || duration == -1) {
3706 /* seekable if we still have a chance to get duration later on */
3708 parse->priv->upstream_seekable && parse->priv->update_interval;
3710 seekable = parse->priv->upstream_seekable;
3711 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3714 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3720 case GST_QUERY_FORMATS:
3721 gst_query_set_formatsv (query, 3, fmtlist);
3724 case GST_QUERY_CONVERT:
3726 GstFormat src_format, dest_format;
3727 gint64 src_value, dest_value;
3729 gst_query_parse_convert (query, &src_format, &src_value,
3730 &dest_format, &dest_value);
3732 res = gst_base_parse_convert (parse, src_format, src_value,
3733 dest_format, &dest_value);
3735 gst_query_set_convert (query, src_format, src_value,
3736 dest_format, dest_value);
3740 case GST_QUERY_LATENCY:
3742 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3744 GstClockTime min_latency, max_latency;
3746 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3747 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3748 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3749 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3751 GST_OBJECT_LOCK (parse);
3752 /* add our latency */
3753 if (min_latency != -1)
3754 min_latency += parse->priv->min_latency;
3755 if (max_latency != -1)
3756 max_latency += parse->priv->max_latency;
3757 GST_OBJECT_UNLOCK (parse);
3759 gst_query_set_latency (query, live, min_latency, max_latency);
3763 case GST_QUERY_SEGMENT:
3768 format = parse->segment.format;
3771 gst_segment_to_stream_time (&parse->segment, format,
3772 parse->segment.start);
3773 if ((stop = parse->segment.stop) == -1)
3774 stop = parse->segment.duration;
3776 stop = gst_segment_to_stream_time (&parse->segment, format, stop);
3778 gst_query_set_segment (query, parse->segment.rate, format, start, stop);
3783 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
3789 /* scans for a cluster start from @pos,
3790 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3791 static GstFlowReturn
3792 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3793 GstClockTime * time, GstClockTime * duration)
3795 GstBaseParseClass *klass;
3797 gboolean orig_drain, orig_discont;
3798 GstFlowReturn ret = GST_FLOW_OK;
3799 GstBuffer *buf = NULL;
3800 GstBaseParseFrame *sframe = NULL;
3802 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3803 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3804 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3806 klass = GST_BASE_PARSE_GET_CLASS (parse);
3808 *time = GST_CLOCK_TIME_NONE;
3809 *duration = GST_CLOCK_TIME_NONE;
3812 orig_offset = parse->priv->offset;
3813 orig_discont = parse->priv->discont;
3814 orig_drain = parse->priv->drain;
3816 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3817 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3819 /* jump elsewhere and locate next frame */
3820 parse->priv->offset = *pos;
3821 /* mark as scanning so frames don't get processed all the way */
3822 parse->priv->scanning = TRUE;
3823 ret = gst_base_parse_scan_frame (parse, klass);
3824 parse->priv->scanning = FALSE;
3825 /* retrieve frame found during scan */
3826 sframe = parse->priv->scanned_frame;
3827 parse->priv->scanned_frame = NULL;
3829 if (ret != GST_FLOW_OK || !sframe)
3832 /* get offset first, subclass parsing might dump other stuff in there */
3833 *pos = sframe->offset;
3834 buf = sframe->buffer;
3837 /* but it should provide proper time */
3838 *time = GST_BUFFER_TIMESTAMP (buf);
3839 *duration = GST_BUFFER_DURATION (buf);
3841 GST_LOG_OBJECT (parse,
3842 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3843 GST_TIME_ARGS (*time), *pos);
3847 gst_base_parse_frame_free (sframe);
3850 parse->priv->offset = orig_offset;
3851 parse->priv->discont = orig_discont;
3852 parse->priv->drain = orig_drain;
3857 /* bisect and scan through file for frame starting before @time,
3858 * returns OK and @time/@offset if found, NONE and/or error otherwise
3859 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3860 static GstFlowReturn
3861 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3864 GstFlowReturn ret = GST_FLOW_OK;
3865 gint64 lpos, hpos, newpos;
3866 GstClockTime time, ltime, htime, newtime, dur;
3867 gboolean cont = TRUE;
3868 const GstClockTime tolerance = TARGET_DIFFERENCE;
3869 const guint chunk = 4 * 1024;
3871 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3872 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3874 GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
3875 GST_TIME_ARGS (*_time));
3877 /* TODO also make keyframe aware if useful some day */
3892 /* do not know at first */
3894 *_time = GST_CLOCK_TIME_NONE;
3896 /* need initial positions; start and end */
3897 lpos = parse->priv->first_frame_offset;
3898 ltime = parse->priv->first_frame_pts;
3899 /* try other one if no luck */
3900 if (!GST_CLOCK_TIME_IS_VALID (ltime))
3901 ltime = parse->priv->first_frame_dts;
3902 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
3903 GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
3904 return GST_FLOW_ERROR;
3906 hpos = parse->priv->upstream_size;
3908 GST_DEBUG_OBJECT (parse,
3909 "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
3910 ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, hpos,
3911 GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
3913 /* check preconditions are satisfied;
3914 * start and end are needed, except for special case where we scan for
3915 * last frame to determine duration */
3916 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
3917 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3918 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3922 /* shortcut cases */
3925 } else if (time < ltime + tolerance) {
3929 } else if (time >= htime) {
3935 while (htime > ltime && cont) {
3936 GST_LOG_OBJECT (parse,
3937 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3938 GST_TIME_ARGS (ltime));
3939 GST_LOG_OBJECT (parse,
3940 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3941 GST_TIME_ARGS (htime));
3942 if (G_UNLIKELY (time == G_MAXINT64)) {
3944 } else if (G_LIKELY (hpos > lpos)) {
3946 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3949 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3951 /* we check this case once, but not forever, so break loop */
3956 newpos = CLAMP (newpos, lpos, hpos);
3957 GST_LOG_OBJECT (parse,
3958 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3959 GST_TIME_ARGS (time), newpos);
3961 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3962 if (ret == GST_FLOW_EOS) {
3963 /* heuristic HACK */
3964 hpos = MAX (lpos, hpos - chunk);
3966 } else if (ret != GST_FLOW_OK) {
3970 if (newtime == -1 || newpos == -1) {
3971 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3975 if (G_UNLIKELY (time == G_MAXINT64)) {
3978 if (GST_CLOCK_TIME_IS_VALID (dur))
3981 } else if (newtime > time) {
3983 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3985 } else if (newtime + tolerance > time) {
3986 /* close enough undershoot */
3990 } else if (newtime < ltime) {
3991 /* so a position beyond lpos resulted in earlier time than ltime ... */
3992 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3995 /* undershoot too far */
3996 newpos += newpos == lpos ? chunk : 0;
3997 lpos = CLAMP (newpos, lpos, hpos);
4003 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
4004 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
4009 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
4010 gboolean before, GstClockTime * _ts)
4012 gint64 bytes = 0, ts = 0;
4013 GstIndexEntry *entry = NULL;
4015 if (time == GST_CLOCK_TIME_NONE) {
4021 GST_BASE_PARSE_INDEX_LOCK (parse);
4022 if (parse->priv->index) {
4023 /* Let's check if we have an index entry for that time */
4024 entry = gst_index_get_assoc_entry (parse->priv->index,
4025 parse->priv->index_id,
4026 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
4027 GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
4031 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
4032 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
4034 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
4035 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
4036 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
4038 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
4039 GST_TIME_ARGS (time));
4042 ts = GST_CLOCK_TIME_NONE;
4045 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4054 /* returns TRUE if seek succeeded */
4056 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
4061 GstSeekType start_type = GST_SEEK_TYPE_NONE, stop_type;
4062 gboolean flush, update, res = TRUE, accurate;
4063 gint64 start, stop, seekpos, seekstop;
4064 GstSegment seeksegment = { 0, };
4065 GstClockTime start_ts;
4067 GstEvent *segment_event;
4069 /* try upstream first, unless we're driving the streaming thread ourselves */
4070 if (parse->priv->pad_mode != GST_PAD_MODE_PULL) {
4071 res = gst_pad_push_event (parse->sinkpad, gst_event_ref (event));
4076 gst_event_parse_seek (event, &rate, &format, &flags,
4077 &start_type, &start, &stop_type, &stop);
4078 seqnum = gst_event_get_seqnum (event);
4080 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
4081 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
4082 GST_TIME_FORMAT, gst_format_get_name (format), rate,
4083 start_type, GST_TIME_ARGS (start), stop_type, GST_TIME_ARGS (stop));
4085 /* we can only handle TIME, so check if subclass can convert
4086 * to TIME format if it's some other format (such as DEFAULT) */
4087 if (format != GST_FORMAT_TIME) {
4088 if (!gst_base_parse_convert (parse, format, start, GST_FORMAT_TIME, &start)
4089 || !gst_base_parse_convert (parse, format, stop, GST_FORMAT_TIME,
4091 goto no_convert_to_time;
4093 GST_INFO_OBJECT (parse, "converted %s format to start time "
4094 "%" GST_TIME_FORMAT " and stop time %" GST_TIME_FORMAT,
4095 gst_format_get_name (format), GST_TIME_ARGS (start),
4096 GST_TIME_ARGS (stop));
4098 format = GST_FORMAT_TIME;
4101 /* no negative rates in push mode (unless upstream takes care of that, but
4102 * we've already tried upstream and it didn't handle the seek request) */
4103 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
4106 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PULL)
4107 goto negative_rate_pull_mode;
4109 if (start_type != GST_SEEK_TYPE_SET ||
4110 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
4113 /* get flush flag */
4114 flush = flags & GST_SEEK_FLAG_FLUSH;
4116 /* copy segment, we need this because we still need the old
4117 * segment when we close the current segment. */
4118 gst_segment_copy_into (&parse->segment, &seeksegment);
4120 GST_DEBUG_OBJECT (parse, "configuring seek");
4121 gst_segment_do_seek (&seeksegment, rate, format, flags,
4122 start_type, start, stop_type, stop, &update);
4124 /* accurate seeking implies seek tables are used to obtain position,
4125 * and the requested segment is maintained exactly, not adjusted any way */
4126 accurate = flags & GST_SEEK_FLAG_ACCURATE;
4128 /* maybe we can be accurate for (almost) free */
4129 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
4130 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
4131 GST_DEBUG_OBJECT (parse, "accurate seek possible");
4135 GstClockTime startpos = seeksegment.position;
4137 /* accurate requested, so ... seek a bit before target */
4138 if (startpos < parse->priv->lead_in_ts)
4141 startpos -= parse->priv->lead_in_ts;
4142 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
4143 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
4146 start_ts = seeksegment.position;
4147 if (!gst_base_parse_convert (parse, format, seeksegment.position,
4148 GST_FORMAT_BYTES, &seekpos))
4149 goto convert_failed;
4150 if (!gst_base_parse_convert (parse, format, seeksegment.stop,
4151 GST_FORMAT_BYTES, &seekstop))
4152 goto convert_failed;
4155 GST_DEBUG_OBJECT (parse,
4156 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
4158 GST_DEBUG_OBJECT (parse,
4159 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
4160 seeksegment.stop, seekstop);
4162 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
4165 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
4168 if (parse->srcpad) {
4169 GstEvent *fevent = gst_event_new_flush_start ();
4170 GST_DEBUG_OBJECT (parse, "sending flush start");
4172 gst_event_set_seqnum (fevent, seqnum);
4174 gst_pad_push_event (parse->srcpad, gst_event_ref (fevent));
4175 /* unlock upstream pull_range */
4176 gst_pad_push_event (parse->sinkpad, fevent);
4179 gst_pad_pause_task (parse->sinkpad);
4182 /* we should now be able to grab the streaming thread because we stopped it
4183 * with the above flush/pause code */
4184 GST_PAD_STREAM_LOCK (parse->sinkpad);
4186 /* save current position */
4187 last_stop = parse->segment.position;
4188 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
4191 /* now commit to new position */
4193 /* prepare for streaming again */
4195 GstEvent *fevent = gst_event_new_flush_stop (TRUE);
4196 GST_DEBUG_OBJECT (parse, "sending flush stop");
4197 gst_event_set_seqnum (fevent, seqnum);
4198 gst_pad_push_event (parse->srcpad, gst_event_ref (fevent));
4199 gst_pad_push_event (parse->sinkpad, fevent);
4200 gst_base_parse_clear_queues (parse);
4202 /* keep track of our position */
4203 seeksegment.base = gst_segment_to_running_time (&seeksegment,
4204 seeksegment.format, parse->segment.position);
4207 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
4209 /* store the newsegment event so it can be sent from the streaming thread. */
4210 /* This will be sent later in _loop() */
4211 parse->priv->pending_segment = TRUE;
4212 segment_event = gst_event_new_segment (&parse->segment);
4213 gst_event_set_seqnum (segment_event, seqnum);
4214 parse->priv->pending_events =
4215 g_list_prepend (parse->priv->pending_events, segment_event);
4217 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
4218 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
4219 ", time = %" GST_TIME_FORMAT, format,
4220 GST_TIME_ARGS (parse->segment.start),
4221 GST_TIME_ARGS (parse->segment.stop),
4222 GST_TIME_ARGS (parse->segment.time));
4224 /* one last chance in pull mode to stay accurate;
4225 * maybe scan and subclass can find where to go */
4228 GstClockTime ts = seeksegment.position;
4230 gst_base_parse_locate_time (parse, &ts, &scanpos);
4234 /* running collected index now consists of several intervals,
4235 * so optimized check no longer possible */
4236 parse->priv->index_last_valid = FALSE;
4237 parse->priv->index_last_offset = 0;
4238 parse->priv->index_last_ts = 0;
4242 /* mark discont if we are going to stream from another position. */
4243 if (seekpos != parse->priv->offset) {
4244 GST_DEBUG_OBJECT (parse,
4245 "mark DISCONT, we did a seek to another position");
4246 parse->priv->offset = seekpos;
4247 parse->priv->last_offset = seekpos;
4248 parse->priv->seen_keyframe = FALSE;
4249 parse->priv->discont = TRUE;
4250 parse->priv->next_dts = start_ts;
4251 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
4252 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
4253 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
4254 parse->priv->sync_offset = seekpos;
4255 parse->priv->exact_position = accurate;
4258 /* Start streaming thread if paused */
4259 gst_pad_start_task (parse->sinkpad,
4260 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad, NULL);
4262 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
4267 GstEvent *new_event;
4268 GstBaseParseSeek *seek;
4269 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
4271 /* The only thing we need to do in PUSH-mode is to send the
4272 seek event (in bytes) to upstream. Segment / flush handling happens
4273 in corresponding src event handlers */
4274 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
4275 if (seekstop >= 0 && seekstop <= seekpos)
4277 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
4278 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
4279 gst_event_set_seqnum (new_event, seqnum);
4281 /* store segment info so its precise details can be reconstructed when
4282 * receiving newsegment;
4283 * this matters for all details when accurate seeking,
4284 * is most useful to preserve NONE stop time otherwise */
4285 seek = g_new0 (GstBaseParseSeek, 1);
4286 seek->segment = seeksegment;
4287 seek->accurate = accurate;
4288 seek->offset = seekpos;
4289 seek->start_ts = start_ts;
4290 GST_OBJECT_LOCK (parse);
4291 /* less optimal, but preserves order */
4292 parse->priv->pending_seeks =
4293 g_slist_append (parse->priv->pending_seeks, seek);
4294 GST_OBJECT_UNLOCK (parse);
4296 res = gst_pad_push_event (parse->sinkpad, new_event);
4299 GST_OBJECT_LOCK (parse);
4300 parse->priv->pending_seeks =
4301 g_slist_remove (parse->priv->pending_seeks, seek);
4302 GST_OBJECT_UNLOCK (parse);
4308 gst_event_unref (event);
4312 negative_rate_pull_mode:
4314 GST_FIXME_OBJECT (parse, "negative playback in pull mode needs fixing");
4320 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
4326 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
4332 GST_DEBUG_OBJECT (parse, "seek in %s format was requested, but subclass "
4333 "couldn't convert that into TIME format", gst_format_get_name (format));
4339 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
4345 /* Checks if bitrates are available from upstream tags so that we don't
4346 * override them later
4349 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
4351 GstTagList *taglist = NULL;
4354 gst_event_parse_tag (event, &taglist);
4356 /* We only care about stream tags here */
4357 if (gst_tag_list_get_scope (taglist) != GST_TAG_SCOPE_STREAM)
4360 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
4361 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
4362 parse->priv->post_min_bitrate = FALSE;
4364 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
4365 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
4366 parse->priv->post_avg_bitrate = FALSE;
4368 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
4369 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
4370 parse->priv->post_max_bitrate = FALSE;
4376 gst_base_parse_set_index (GstElement * element, GstIndex * index)
4378 GstBaseParse *parse = GST_BASE_PARSE (element);
4380 GST_BASE_PARSE_INDEX_LOCK (parse);
4381 if (parse->priv->index)
4382 gst_object_unref (parse->priv->index);
4384 parse->priv->index = gst_object_ref (index);
4385 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4386 &parse->priv->index_id);
4387 parse->priv->own_index = FALSE;
4389 parse->priv->index = NULL;
4391 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4395 gst_base_parse_get_index (GstElement * element)
4397 GstBaseParse *parse = GST_BASE_PARSE (element);
4398 GstIndex *result = NULL;
4400 GST_BASE_PARSE_INDEX_LOCK (parse);
4401 if (parse->priv->index)
4402 result = gst_object_ref (parse->priv->index);
4403 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4409 static GstStateChangeReturn
4410 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4412 GstBaseParse *parse;
4413 GstStateChangeReturn result;
4415 parse = GST_BASE_PARSE (element);
4417 switch (transition) {
4418 case GST_STATE_CHANGE_READY_TO_PAUSED:
4419 /* If this is our own index destroy it as the
4420 * old entries might be wrong for the new stream */
4421 GST_BASE_PARSE_INDEX_LOCK (parse);
4422 if (parse->priv->own_index) {
4423 gst_object_unref (parse->priv->index);
4424 parse->priv->index = NULL;
4425 parse->priv->own_index = FALSE;
4428 /* If no index was created, generate one */
4429 if (G_UNLIKELY (!parse->priv->index)) {
4430 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4432 parse->priv->index = g_object_new (gst_mem_index_get_type (), NULL);
4433 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4434 &parse->priv->index_id);
4435 parse->priv->own_index = TRUE;
4437 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4443 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4445 switch (transition) {
4446 case GST_STATE_CHANGE_PAUSED_TO_READY:
4447 gst_base_parse_reset (parse);
4457 * gst_base_parse_set_ts_at_offset:
4458 * @parse: a #GstBaseParse
4459 * @offset: offset into current buffer
4461 * This function should only be called from a @handle_frame implementation.
4463 * GstBaseParse creates initial timestamps for frames by using the last
4464 * timestamp seen in the stream before the frame starts. In certain
4465 * cases, the correct timestamps will occur in the stream after the
4466 * start of the frame, but before the start of the actual picture data.
4467 * This function can be used to set the timestamps based on the offset
4468 * into the frame data that the picture starts.
4473 gst_base_parse_set_ts_at_offset (GstBaseParse * parse, gsize offset)
4475 GstClockTime pts, dts;
4477 g_return_if_fail (GST_IS_BASE_PARSE (parse));
4478 g_return_if_fail (offset >= 0);
4480 pts = gst_adapter_prev_pts_at_offset (parse->priv->adapter, offset, NULL);
4481 dts = gst_adapter_prev_dts_at_offset (parse->priv->adapter, offset, NULL);
4483 if (!GST_CLOCK_TIME_IS_VALID (pts) || !GST_CLOCK_TIME_IS_VALID (dts)) {
4484 GST_DEBUG_OBJECT (parse,
4485 "offset adapter timestamps dts=%" GST_TIME_FORMAT " pts=%"
4486 GST_TIME_FORMAT, GST_TIME_ARGS (dts), GST_TIME_ARGS (pts));
4488 if (GST_CLOCK_TIME_IS_VALID (pts) && (parse->priv->prev_pts != pts))
4489 parse->priv->prev_pts = parse->priv->next_pts = pts;
4491 if (GST_CLOCK_TIME_IS_VALID (dts) && (parse->priv->prev_dts != dts))
4492 parse->priv->prev_dts = parse->priv->next_dts = dts;