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;
269 GstClockTime next_pts;
270 GstClockTime next_dts;
271 GstClockTime prev_pts;
272 GstClockTime prev_dts;
273 GstClockTime frame_duration;
274 gboolean seen_keyframe;
280 guint64 data_bytecount;
281 guint64 acc_duration;
282 GstClockTime first_frame_pts;
283 GstClockTime first_frame_dts;
284 gint64 first_frame_offset;
286 gboolean post_min_bitrate;
287 gboolean post_avg_bitrate;
288 gboolean post_max_bitrate;
292 guint posted_avg_bitrate;
294 /* frames/buffers that are queued and ready to go on OK */
295 GQueue queued_frames;
299 /* index entry storage, either ours or provided */
305 /* seek table entries only maintained if upstream is BYTE seekable */
306 gboolean upstream_seekable;
307 gboolean upstream_has_duration;
308 gint64 upstream_size;
309 GstFormat upstream_format;
310 /* minimum distance between two index entries */
311 GstClockTimeDiff idx_interval;
312 guint64 idx_byte_interval;
313 /* ts and offset of last entry added */
314 GstClockTime index_last_ts;
315 gint64 index_last_offset;
316 gboolean index_last_valid;
318 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
319 gboolean exact_position;
320 /* seek events are temporarily kept to match them with newsegments */
321 GSList *pending_seeks;
323 /* reverse playback */
324 GSList *buffers_pending;
325 GSList *buffers_head;
326 GSList *buffers_queued;
327 GSList *buffers_send;
328 GstClockTime last_pts;
329 GstClockTime last_dts;
332 /* Pending serialized events */
333 GList *pending_events;
335 /* If baseparse has checked the caps to identify if it is
336 * handling video or audio */
337 gboolean checked_media;
339 /* offset of last parsed frame/data */
341 /* force a new frame, regardless of offset */
343 /* whether we are merely scanning for a frame */
345 /* ... and resulting frame, if any */
346 GstBaseParseFrame *scanned_frame;
348 /* TRUE if we're still detecting the format, i.e.
349 * if ::detect() is still called for future buffers */
351 GList *detect_buffers;
352 guint detect_buffers_size;
354 /* True when no buffers have been received yet */
355 gboolean first_buffer;
357 /* if TRUE, a STREAM_START event needs to be pushed */
358 gboolean push_stream_start;
360 /* When we need to skip more data than we have currently */
364 typedef struct _GstBaseParseSeek
369 GstClockTime start_ts;
372 #define DEFAULT_DISABLE_PASSTHROUGH FALSE
377 PROP_DISABLE_PASSTHROUGH,
381 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
382 g_mutex_lock (&parse->priv->index_lock);
383 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
384 g_mutex_unlock (&parse->priv->index_lock);
386 static GstElementClass *parent_class = NULL;
388 static void gst_base_parse_class_init (GstBaseParseClass * klass);
389 static void gst_base_parse_init (GstBaseParse * parse,
390 GstBaseParseClass * klass);
393 gst_base_parse_get_type (void)
395 static volatile gsize base_parse_type = 0;
397 if (g_once_init_enter (&base_parse_type)) {
398 static const GTypeInfo base_parse_info = {
399 sizeof (GstBaseParseClass),
400 (GBaseInitFunc) NULL,
401 (GBaseFinalizeFunc) NULL,
402 (GClassInitFunc) gst_base_parse_class_init,
405 sizeof (GstBaseParse),
407 (GInstanceInitFunc) gst_base_parse_init,
411 _type = g_type_register_static (GST_TYPE_ELEMENT,
412 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
413 g_once_init_leave (&base_parse_type, _type);
415 return (GType) base_parse_type;
418 static void gst_base_parse_finalize (GObject * object);
420 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
421 GstStateChange transition);
422 static void gst_base_parse_reset (GstBaseParse * parse);
425 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
426 static GstIndex *gst_base_parse_get_index (GstElement * element);
429 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
431 static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
432 GstObject * parent, GstPadMode mode, gboolean active);
433 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
435 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
437 static void gst_base_parse_set_property (GObject * object, guint prop_id,
438 const GValue * value, GParamSpec * pspec);
439 static void gst_base_parse_get_property (GObject * object, guint prop_id,
440 GValue * value, GParamSpec * pspec);
442 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
444 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
447 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
449 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
452 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
454 static void gst_base_parse_loop (GstPad * pad);
456 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
457 GstBaseParseFrame * frame);
459 static gboolean gst_base_parse_sink_event_default (GstBaseParse * parse,
462 static gboolean gst_base_parse_src_event_default (GstBaseParse * parse,
465 static gboolean gst_base_parse_sink_query_default (GstBaseParse * parse,
467 static gboolean gst_base_parse_src_query_default (GstBaseParse * parse,
470 static void gst_base_parse_drain (GstBaseParse * parse);
472 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
473 gboolean post_min, gboolean post_avg, gboolean post_max);
475 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
476 GstClockTime time, gboolean before, GstClockTime * _ts);
477 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
478 GstClockTime * _time, gint64 * _offset);
480 static GstFlowReturn gst_base_parse_start_fragment (GstBaseParse * parse);
481 static GstFlowReturn gst_base_parse_finish_fragment (GstBaseParse * parse,
483 static GstFlowReturn gst_base_parse_send_buffers (GstBaseParse * parse);
485 static inline GstFlowReturn gst_base_parse_check_sync (GstBaseParse * parse);
487 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
489 static void gst_base_parse_push_pending_events (GstBaseParse * parse);
492 gst_base_parse_clear_queues (GstBaseParse * parse)
494 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
495 g_slist_free (parse->priv->buffers_queued);
496 parse->priv->buffers_queued = NULL;
497 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
499 g_slist_free (parse->priv->buffers_pending);
500 parse->priv->buffers_pending = NULL;
501 g_slist_foreach (parse->priv->buffers_head, (GFunc) gst_buffer_unref, NULL);
502 g_slist_free (parse->priv->buffers_head);
503 parse->priv->buffers_head = NULL;
504 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
505 g_slist_free (parse->priv->buffers_send);
506 parse->priv->buffers_send = NULL;
508 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
509 g_list_free (parse->priv->detect_buffers);
510 parse->priv->detect_buffers = NULL;
511 parse->priv->detect_buffers_size = 0;
513 g_queue_foreach (&parse->priv->queued_frames,
514 (GFunc) gst_base_parse_frame_free, NULL);
515 g_queue_clear (&parse->priv->queued_frames);
517 gst_buffer_replace (&parse->priv->cache, NULL);
519 g_list_foreach (parse->priv->pending_events, (GFunc) gst_event_unref, NULL);
520 g_list_free (parse->priv->pending_events);
521 parse->priv->pending_events = NULL;
523 parse->priv->checked_media = FALSE;
527 gst_base_parse_finalize (GObject * object)
529 GstBaseParse *parse = GST_BASE_PARSE (object);
531 g_object_unref (parse->priv->adapter);
533 if (parse->priv->cache) {
534 gst_buffer_unref (parse->priv->cache);
535 parse->priv->cache = NULL;
538 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
540 g_list_free (parse->priv->pending_events);
541 parse->priv->pending_events = NULL;
543 if (parse->priv->index) {
544 gst_object_unref (parse->priv->index);
545 parse->priv->index = NULL;
547 g_mutex_clear (&parse->priv->index_lock);
549 gst_base_parse_clear_queues (parse);
551 G_OBJECT_CLASS (parent_class)->finalize (object);
555 gst_base_parse_class_init (GstBaseParseClass * klass)
557 GObjectClass *gobject_class;
558 GstElementClass *gstelement_class;
560 gobject_class = G_OBJECT_CLASS (klass);
561 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
562 parent_class = g_type_class_peek_parent (klass);
564 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
565 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_base_parse_set_property);
566 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_base_parse_get_property);
569 * GstBaseParse:disable-passthrough:
571 * If set to %TRUE, baseparse will unconditionally force parsing of the
572 * incoming data. This can be required in the rare cases where the incoming
573 * side-data (caps, pts, dts, ...) is not trusted by the user and wants to
574 * force validation and parsing of the incoming data.
575 * If set to %FALSE, decision of whether to parse the data or not is up to
576 * the implementation (standard behaviour).
578 g_object_class_install_property (gobject_class, PROP_DISABLE_PASSTHROUGH,
579 g_param_spec_boolean ("disable-passthrough", "Disable passthrough",
580 "Force processing (disables passthrough)",
581 DEFAULT_DISABLE_PASSTHROUGH,
582 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
584 gstelement_class = (GstElementClass *) klass;
585 gstelement_class->change_state =
586 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
589 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
590 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
593 /* Default handlers */
594 klass->sink_event = gst_base_parse_sink_event_default;
595 klass->src_event = gst_base_parse_src_event_default;
596 klass->sink_query = gst_base_parse_sink_query_default;
597 klass->src_query = gst_base_parse_src_query_default;
598 klass->convert = gst_base_parse_convert_default;
600 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
601 "baseparse element");
605 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
607 GstPadTemplate *pad_template;
609 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
611 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
614 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
615 g_return_if_fail (pad_template != NULL);
616 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
617 gst_pad_set_event_function (parse->sinkpad,
618 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
619 gst_pad_set_query_function (parse->sinkpad,
620 GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
621 gst_pad_set_chain_function (parse->sinkpad,
622 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
623 gst_pad_set_activate_function (parse->sinkpad,
624 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
625 gst_pad_set_activatemode_function (parse->sinkpad,
626 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
627 GST_PAD_SET_PROXY_ALLOCATION (parse->sinkpad);
628 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
630 GST_DEBUG_OBJECT (parse, "sinkpad created");
633 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
634 g_return_if_fail (pad_template != NULL);
635 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
636 gst_pad_set_event_function (parse->srcpad,
637 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
638 gst_pad_set_query_function (parse->srcpad,
639 GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
640 gst_pad_use_fixed_caps (parse->srcpad);
641 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
642 GST_DEBUG_OBJECT (parse, "src created");
644 g_queue_init (&parse->priv->queued_frames);
646 parse->priv->adapter = gst_adapter_new ();
648 parse->priv->pad_mode = GST_PAD_MODE_NONE;
650 g_mutex_init (&parse->priv->index_lock);
653 gst_base_parse_reset (parse);
654 GST_DEBUG_OBJECT (parse, "init ok");
656 GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE);
660 gst_base_parse_set_property (GObject * object, guint prop_id,
661 const GValue * value, GParamSpec * pspec)
663 GstBaseParse *parse = GST_BASE_PARSE (object);
666 case PROP_DISABLE_PASSTHROUGH:
667 parse->priv->disable_passthrough = g_value_get_boolean (value);
670 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
676 gst_base_parse_get_property (GObject * object, guint prop_id, GValue * value,
679 GstBaseParse *parse = GST_BASE_PARSE (object);
682 case PROP_DISABLE_PASSTHROUGH:
683 g_value_set_boolean (value, parse->priv->disable_passthrough);
686 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
691 static GstBaseParseFrame *
692 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
694 GstBaseParseFrame *copy;
696 copy = g_slice_dup (GstBaseParseFrame, frame);
697 copy->buffer = gst_buffer_ref (frame->buffer);
698 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
700 GST_TRACE ("copied frame %p -> %p", frame, copy);
706 gst_base_parse_frame_free (GstBaseParseFrame * frame)
708 GST_TRACE ("freeing frame %p", frame);
711 gst_buffer_unref (frame->buffer);
712 frame->buffer = NULL;
715 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
716 g_slice_free (GstBaseParseFrame, frame);
718 memset (frame, 0, sizeof (*frame));
722 G_DEFINE_BOXED_TYPE (GstBaseParseFrame, gst_base_parse_frame,
723 (GBoxedCopyFunc) gst_base_parse_frame_copy,
724 (GBoxedFreeFunc) gst_base_parse_frame_free);
727 * gst_base_parse_frame_init:
728 * @frame: #GstBaseParseFrame.
730 * Sets a #GstBaseParseFrame to initial state. Currently this means
731 * all public fields are zero-ed and a private flag is set to make
732 * sure gst_base_parse_frame_free() only frees the contents but not
733 * the actual frame. Use this function to initialise a #GstBaseParseFrame
734 * allocated on the stack.
737 gst_base_parse_frame_init (GstBaseParseFrame * frame)
739 memset (frame, 0, sizeof (GstBaseParseFrame));
740 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
741 GST_TRACE ("inited frame %p", frame);
745 * gst_base_parse_frame_new:
746 * @buffer: (transfer none): a #GstBuffer
748 * @overhead: number of bytes in this frame which should be counted as
749 * metadata overhead, ie. not used to calculate the average bitrate.
750 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
752 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
753 * elements written in C should usually allocate the frame on the stack and
754 * then use gst_base_parse_frame_init() to initialise it.
756 * Returns: a newly-allocated #GstBaseParseFrame. Free with
757 * gst_base_parse_frame_free() when no longer needed.
760 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
763 GstBaseParseFrame *frame;
765 frame = g_slice_new0 (GstBaseParseFrame);
766 frame->buffer = gst_buffer_ref (buffer);
768 GST_TRACE ("created frame %p", frame);
773 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
776 gst_buffer_replace (&frame->buffer, buf);
780 /* set flags one by one for clarity */
781 if (G_UNLIKELY (parse->priv->drain))
782 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
784 /* losing sync is pretty much a discont (and vice versa), no ? */
785 if (G_UNLIKELY (parse->priv->discont))
786 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
790 gst_base_parse_reset (GstBaseParse * parse)
792 GST_OBJECT_LOCK (parse);
793 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
794 parse->priv->duration = -1;
795 parse->priv->min_frame_size = 1;
796 parse->priv->discont = TRUE;
797 parse->priv->flushing = FALSE;
798 parse->priv->saw_gaps = FALSE;
799 parse->priv->offset = 0;
800 parse->priv->sync_offset = 0;
801 parse->priv->update_interval = -1;
802 parse->priv->fps_num = parse->priv->fps_den = 0;
803 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
804 parse->priv->lead_in = parse->priv->lead_out = 0;
805 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
806 parse->priv->bitrate = 0;
807 parse->priv->framecount = 0;
808 parse->priv->bytecount = 0;
809 parse->priv->acc_duration = 0;
810 parse->priv->first_frame_pts = GST_CLOCK_TIME_NONE;
811 parse->priv->first_frame_dts = GST_CLOCK_TIME_NONE;
812 parse->priv->first_frame_offset = -1;
813 parse->priv->estimated_duration = -1;
814 parse->priv->estimated_drift = 0;
815 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
816 parse->priv->next_dts = 0;
817 parse->priv->syncable = TRUE;
818 parse->priv->disable_passthrough = DEFAULT_DISABLE_PASSTHROUGH;
819 parse->priv->passthrough = FALSE;
820 parse->priv->pts_interpolate = TRUE;
821 parse->priv->infer_ts = TRUE;
822 parse->priv->has_timing_info = FALSE;
823 parse->priv->post_min_bitrate = TRUE;
824 parse->priv->post_avg_bitrate = TRUE;
825 parse->priv->post_max_bitrate = TRUE;
826 parse->priv->min_bitrate = G_MAXUINT;
827 parse->priv->max_bitrate = 0;
828 parse->priv->avg_bitrate = 0;
829 parse->priv->posted_avg_bitrate = 0;
831 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
832 parse->priv->index_last_offset = -1;
833 parse->priv->index_last_valid = TRUE;
834 parse->priv->upstream_seekable = FALSE;
835 parse->priv->upstream_size = 0;
836 parse->priv->upstream_has_duration = FALSE;
837 parse->priv->upstream_format = GST_FORMAT_UNDEFINED;
838 parse->priv->idx_interval = 0;
839 parse->priv->idx_byte_interval = 0;
840 parse->priv->exact_position = TRUE;
841 parse->priv->seen_keyframe = FALSE;
842 parse->priv->checked_media = FALSE;
844 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
845 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
846 parse->priv->last_offset = 0;
848 parse->priv->skip = 0;
850 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
852 g_list_free (parse->priv->pending_events);
853 parse->priv->pending_events = NULL;
855 if (parse->priv->cache) {
856 gst_buffer_unref (parse->priv->cache);
857 parse->priv->cache = NULL;
860 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
861 g_slist_free (parse->priv->pending_seeks);
862 parse->priv->pending_seeks = NULL;
864 if (parse->priv->adapter)
865 gst_adapter_clear (parse->priv->adapter);
867 parse->priv->new_frame = TRUE;
869 parse->priv->first_buffer = TRUE;
871 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
872 g_list_free (parse->priv->detect_buffers);
873 parse->priv->detect_buffers = NULL;
874 parse->priv->detect_buffers_size = 0;
875 GST_OBJECT_UNLOCK (parse);
878 /* gst_base_parse_parse_frame:
879 * @parse: #GstBaseParse.
880 * @buffer: #GstBuffer.
882 * Default callback for parse_frame.
885 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
887 GstBuffer *buffer = frame->buffer;
889 if (!GST_BUFFER_PTS_IS_VALID (buffer) &&
890 GST_CLOCK_TIME_IS_VALID (parse->priv->next_pts)) {
891 GST_BUFFER_PTS (buffer) = parse->priv->next_pts;
893 if (!GST_BUFFER_DTS_IS_VALID (buffer) &&
894 GST_CLOCK_TIME_IS_VALID (parse->priv->next_dts)) {
895 GST_BUFFER_DTS (buffer) = parse->priv->next_dts;
897 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
898 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
899 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
904 /* gst_base_parse_convert:
905 * @parse: #GstBaseParse.
906 * @src_format: #GstFormat describing the source format.
907 * @src_value: Source value to be converted.
908 * @dest_format: #GstFormat defining the converted format.
909 * @dest_value: Pointer where the conversion result will be put.
911 * Converts using configured "convert" vmethod in #GstBaseParse class.
913 * Returns: %TRUE if conversion was successful.
916 gst_base_parse_convert (GstBaseParse * parse,
917 GstFormat src_format,
918 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
920 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
923 g_return_val_if_fail (dest_value != NULL, FALSE);
928 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
930 #ifndef GST_DISABLE_GST_DEBUG
933 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
934 GST_LOG_OBJECT (parse,
935 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
936 GST_TIME_ARGS (src_value), *dest_value);
937 } else if (dest_format == GST_FORMAT_TIME &&
938 src_format == GST_FORMAT_BYTES) {
939 GST_LOG_OBJECT (parse,
940 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
941 src_value, GST_TIME_ARGS (*dest_value));
943 GST_LOG_OBJECT (parse,
944 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
945 GST_STR_NULL (gst_format_get_name (src_format)),
946 GST_STR_NULL (gst_format_get_name (dest_format)),
947 src_value, *dest_value);
950 GST_DEBUG_OBJECT (parse, "conversion failed");
958 /* gst_base_parse_sink_event:
959 * @pad: #GstPad that received the event.
960 * @event: #GstEvent to be handled.
962 * Handler for sink pad events.
964 * Returns: %TRUE if the event was handled.
967 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
969 GstBaseParse *parse = GST_BASE_PARSE (parent);
970 GstBaseParseClass *bclass = GST_BASE_PARSE_GET_CLASS (parse);
973 ret = bclass->sink_event (parse, event);
979 /* gst_base_parse_sink_event_default:
980 * @parse: #GstBaseParse.
981 * @event: #GstEvent to be handled.
983 * Element-level event handler function.
985 * The event will be unreffed only if it has been handled and this
986 * function returns %TRUE
988 * Returns: %TRUE if the event was handled and not need forwarding.
991 gst_base_parse_sink_event_default (GstBaseParse * parse, GstEvent * event)
993 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
994 gboolean ret = FALSE;
995 gboolean forward_immediate = FALSE;
997 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
998 GST_EVENT_TYPE_NAME (event));
1000 switch (GST_EVENT_TYPE (event)) {
1001 case GST_EVENT_CAPS:
1005 gst_event_parse_caps (event, &caps);
1006 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
1008 if (klass->set_sink_caps)
1009 ret = klass->set_sink_caps (parse, caps);
1013 /* will send our own caps downstream */
1014 gst_event_unref (event);
1018 case GST_EVENT_SEGMENT:
1020 const GstSegment *in_segment;
1021 GstSegment out_segment;
1022 gint64 offset = 0, next_dts;
1023 guint32 seqnum = gst_event_get_seqnum (event);
1025 gst_event_parse_segment (event, &in_segment);
1026 gst_segment_init (&out_segment, GST_FORMAT_TIME);
1027 out_segment.rate = in_segment->rate;
1028 out_segment.applied_rate = in_segment->applied_rate;
1030 GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
1032 parse->priv->upstream_format = in_segment->format;
1033 if (in_segment->format == GST_FORMAT_BYTES) {
1034 GstBaseParseSeek *seek = NULL;
1037 /* stop time is allowed to be open-ended, but not start & pos */
1038 offset = in_segment->time;
1040 GST_OBJECT_LOCK (parse);
1041 for (node = parse->priv->pending_seeks; node; node = node->next) {
1042 GstBaseParseSeek *tmp = node->data;
1044 if (tmp->offset == offset) {
1049 parse->priv->pending_seeks =
1050 g_slist_remove (parse->priv->pending_seeks, seek);
1051 GST_OBJECT_UNLOCK (parse);
1054 GST_DEBUG_OBJECT (parse,
1055 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
1056 seek->accurate ? " accurate" : "", &seek->segment);
1058 out_segment.start = seek->segment.start;
1059 out_segment.stop = seek->segment.stop;
1060 out_segment.time = seek->segment.start;
1062 next_dts = seek->start_ts;
1063 parse->priv->exact_position = seek->accurate;
1066 /* best attempt convert */
1067 /* as these are only estimates, stop is kept open-ended to avoid
1068 * premature cutting */
1069 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
1070 GST_FORMAT_TIME, (gint64 *) & next_dts);
1072 out_segment.start = next_dts;
1073 out_segment.stop = GST_CLOCK_TIME_NONE;
1074 out_segment.time = next_dts;
1076 parse->priv->exact_position = (in_segment->start == 0);
1079 gst_event_unref (event);
1081 event = gst_event_new_segment (&out_segment);
1082 gst_event_set_seqnum (event, seqnum);
1084 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1085 GST_SEGMENT_FORMAT, in_segment);
1087 } else if (in_segment->format != GST_FORMAT_TIME) {
1088 /* Unknown incoming segment format. Output a default open-ended
1090 gst_event_unref (event);
1092 out_segment.start = 0;
1093 out_segment.stop = GST_CLOCK_TIME_NONE;
1094 out_segment.time = 0;
1096 event = gst_event_new_segment (&out_segment);
1097 gst_event_set_seqnum (event, seqnum);
1101 /* not considered BYTE seekable if it is talking to us in TIME,
1102 * whatever else it might claim */
1103 parse->priv->upstream_seekable = FALSE;
1104 next_dts = in_segment->start;
1105 gst_event_copy_segment (event, &out_segment);
1108 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1111 gst_segment_set_newsegment (&parse->segment, update, rate,
1112 applied_rate, format, start, stop, start);
1117 /* save the segment for later, right before we push a new buffer so that
1118 * the caps are fixed and the next linked element can receive
1119 * the segment but finish the current segment */
1120 GST_DEBUG_OBJECT (parse, "draining current segment");
1121 if (in_segment->rate > 0.0)
1122 gst_base_parse_drain (parse);
1124 gst_base_parse_finish_fragment (parse, FALSE);
1125 gst_adapter_clear (parse->priv->adapter);
1127 parse->priv->offset = offset;
1128 parse->priv->sync_offset = offset;
1129 parse->priv->next_dts = next_dts;
1130 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
1131 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
1132 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
1133 parse->priv->prev_pts = GST_CLOCK_TIME_NONE;
1134 parse->priv->prev_dts = GST_CLOCK_TIME_NONE;
1135 parse->priv->discont = TRUE;
1136 parse->priv->seen_keyframe = FALSE;
1137 parse->priv->skip = 0;
1141 case GST_EVENT_SEGMENT_DONE:
1142 /* need to drain now, rather than upon a new segment,
1143 * since that would have SEGMENT_DONE come before potential
1144 * delayed last part of the current segment */
1145 GST_DEBUG_OBJECT (parse, "draining current segment");
1146 if (parse->segment.rate > 0.0)
1147 gst_base_parse_drain (parse);
1149 gst_base_parse_finish_fragment (parse, FALSE);
1152 case GST_EVENT_FLUSH_START:
1153 GST_OBJECT_LOCK (parse);
1154 parse->priv->flushing = TRUE;
1155 GST_OBJECT_UNLOCK (parse);
1158 case GST_EVENT_FLUSH_STOP:
1159 gst_adapter_clear (parse->priv->adapter);
1160 gst_base_parse_clear_queues (parse);
1161 parse->priv->flushing = FALSE;
1162 parse->priv->discont = TRUE;
1163 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
1164 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
1165 parse->priv->new_frame = TRUE;
1166 parse->priv->skip = 0;
1168 forward_immediate = TRUE;
1172 if (parse->segment.rate > 0.0)
1173 gst_base_parse_drain (parse);
1175 gst_base_parse_finish_fragment (parse, TRUE);
1177 /* If we STILL have zero frames processed, fire an error */
1178 if (parse->priv->framecount == 0 && !parse->priv->saw_gaps) {
1179 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1180 ("No valid frames found before end of stream"), (NULL));
1182 /* newsegment and other serialized events before eos */
1183 gst_base_parse_push_pending_events (parse);
1185 if (!parse->priv->saw_gaps
1186 && parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1187 /* We've not posted bitrate tags yet - do so now */
1188 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
1190 forward_immediate = TRUE;
1192 case GST_EVENT_CUSTOM_DOWNSTREAM:{
1193 /* FIXME: Code duplicated from libgstvideo because core can't depend on -base */
1194 #ifndef GST_VIDEO_EVENT_STILL_STATE_NAME
1195 #define GST_VIDEO_EVENT_STILL_STATE_NAME "GstEventStillFrame"
1198 const GstStructure *s;
1199 gboolean ev_still_state;
1201 s = gst_event_get_structure (event);
1203 gst_structure_has_name (s, GST_VIDEO_EVENT_STILL_STATE_NAME) &&
1204 gst_structure_get_boolean (s, "still-state", &ev_still_state)) {
1205 if (ev_still_state) {
1206 GST_DEBUG_OBJECT (parse, "draining current data for still-frame");
1207 if (parse->segment.rate > 0.0)
1208 gst_base_parse_drain (parse);
1210 gst_base_parse_finish_fragment (parse, TRUE);
1212 forward_immediate = TRUE;
1218 GST_DEBUG_OBJECT (parse, "draining current data due to gap event");
1220 gst_base_parse_push_pending_events (parse);
1222 if (parse->segment.rate > 0.0)
1223 gst_base_parse_drain (parse);
1225 gst_base_parse_finish_fragment (parse, TRUE);
1226 forward_immediate = TRUE;
1227 parse->priv->saw_gaps = TRUE;
1231 /* See if any bitrate tags were posted */
1232 gst_base_parse_handle_tag (parse, event);
1235 case GST_EVENT_STREAM_START:
1236 if (parse->priv->pad_mode != GST_PAD_MODE_PULL)
1237 forward_immediate = TRUE;
1244 /* Forward non-serialized events and EOS/FLUSH_STOP immediately.
1245 * For EOS this is required because no buffer or serialized event
1246 * will come after EOS and nothing could trigger another
1247 * _finish_frame() call. *
1248 * If the subclass handles sending of EOS manually it can return
1249 * _DROPPED from ::finish() and all other subclasses should have
1250 * decoded/flushed all remaining data before this
1252 * For FLUSH_STOP this is required because it is expected
1253 * to be forwarded immediately and no buffers are queued anyway.
1256 if (!GST_EVENT_IS_SERIALIZED (event) || forward_immediate) {
1257 ret = gst_pad_push_event (parse->srcpad, event);
1259 parse->priv->pending_events =
1260 g_list_prepend (parse->priv->pending_events, event);
1265 GST_DEBUG_OBJECT (parse, "event handled");
1271 gst_base_parse_sink_query_default (GstBaseParse * parse, GstQuery * query)
1276 pad = GST_BASE_PARSE_SINK_PAD (parse);
1278 switch (GST_QUERY_TYPE (query)) {
1279 case GST_QUERY_CAPS:
1281 GstBaseParseClass *bclass;
1283 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1285 if (bclass->get_sink_caps) {
1286 GstCaps *caps, *filter;
1288 gst_query_parse_caps (query, &filter);
1289 caps = bclass->get_sink_caps (parse, filter);
1290 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1292 gst_query_set_caps_result (query, caps);
1293 gst_caps_unref (caps);
1297 GstCaps *caps, *template_caps, *filter;
1299 gst_query_parse_caps (query, &filter);
1300 template_caps = gst_pad_get_pad_template_caps (pad);
1301 if (filter != NULL) {
1303 gst_caps_intersect_full (filter, template_caps,
1304 GST_CAPS_INTERSECT_FIRST);
1305 gst_caps_unref (template_caps);
1307 caps = template_caps;
1309 gst_query_set_caps_result (query, caps);
1310 gst_caps_unref (caps);
1318 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
1327 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1329 GstBaseParseClass *bclass;
1330 GstBaseParse *parse;
1333 parse = GST_BASE_PARSE (parent);
1334 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1336 GST_DEBUG_OBJECT (parse, "%s query", GST_QUERY_TYPE_NAME (query));
1338 if (bclass->sink_query)
1339 ret = bclass->sink_query (parse, query);
1343 GST_LOG_OBJECT (parse, "%s query result: %d %" GST_PTR_FORMAT,
1344 GST_QUERY_TYPE_NAME (query), ret, query);
1350 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
1352 GstBaseParseClass *bclass;
1353 GstBaseParse *parse;
1356 parse = GST_BASE_PARSE (parent);
1357 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1359 GST_DEBUG_OBJECT (parse, "%s query: %" GST_PTR_FORMAT,
1360 GST_QUERY_TYPE_NAME (query), query);
1362 if (bclass->src_query)
1363 ret = bclass->src_query (parse, query);
1367 GST_LOG_OBJECT (parse, "%s query result: %d %" GST_PTR_FORMAT,
1368 GST_QUERY_TYPE_NAME (query), ret, query);
1373 /* gst_base_parse_src_event:
1374 * @pad: #GstPad that received the event.
1375 * @event: #GstEvent that was received.
1377 * Handler for source pad events.
1379 * Returns: %TRUE if the event was handled.
1382 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1384 GstBaseParse *parse;
1385 GstBaseParseClass *bclass;
1386 gboolean ret = TRUE;
1388 parse = GST_BASE_PARSE (parent);
1389 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1391 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1392 GST_EVENT_TYPE_NAME (event));
1394 if (bclass->src_event)
1395 ret = bclass->src_event (parse, event);
1397 gst_event_unref (event);
1403 gst_base_parse_is_seekable (GstBaseParse * parse)
1405 /* FIXME: could do more here, e.g. check index or just send data from 0
1406 * in pull mode and let decoder/sink clip */
1407 return parse->priv->syncable;
1410 /* gst_base_parse_src_event_default:
1411 * @parse: #GstBaseParse.
1412 * @event: #GstEvent that was received.
1414 * Default srcpad event handler.
1416 * Returns: %TRUE if the event was handled and can be dropped.
1419 gst_base_parse_src_event_default (GstBaseParse * parse, GstEvent * event)
1421 gboolean res = FALSE;
1423 switch (GST_EVENT_TYPE (event)) {
1424 case GST_EVENT_SEEK:
1425 if (gst_base_parse_is_seekable (parse))
1426 res = gst_base_parse_handle_seek (parse, event);
1429 res = gst_pad_event_default (parse->srcpad, GST_OBJECT_CAST (parse),
1438 * gst_base_parse_convert_default:
1439 * @parse: #GstBaseParse.
1440 * @src_format: #GstFormat describing the source format.
1441 * @src_value: Source value to be converted.
1442 * @dest_format: #GstFormat defining the converted format.
1443 * @dest_value: Pointer where the conversion result will be put.
1445 * Default implementation of "convert" vmethod in #GstBaseParse class.
1447 * Returns: %TRUE if conversion was successful.
1450 gst_base_parse_convert_default (GstBaseParse * parse,
1451 GstFormat src_format,
1452 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1454 gboolean ret = FALSE;
1455 guint64 bytes, duration;
1457 if (G_UNLIKELY (src_format == dest_format)) {
1458 *dest_value = src_value;
1462 if (G_UNLIKELY (src_value == -1)) {
1467 if (G_UNLIKELY (src_value == 0)) {
1472 /* need at least some frames */
1473 if (!parse->priv->framecount)
1476 duration = parse->priv->acc_duration / GST_MSECOND;
1477 bytes = parse->priv->bytecount;
1479 if (G_UNLIKELY (!duration || !bytes))
1480 goto no_duration_bytes;
1482 if (src_format == GST_FORMAT_BYTES) {
1483 if (dest_format == GST_FORMAT_TIME) {
1484 /* BYTES -> TIME conversion */
1485 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1486 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1487 *dest_value *= GST_MSECOND;
1488 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1489 *dest_value / GST_MSECOND);
1492 GST_DEBUG_OBJECT (parse, "converting bytes -> other not implemented");
1494 } else if (src_format == GST_FORMAT_TIME) {
1495 if (dest_format == GST_FORMAT_BYTES) {
1496 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1497 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1499 GST_DEBUG_OBJECT (parse,
1500 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1501 src_value / GST_MSECOND, *dest_value);
1504 GST_DEBUG_OBJECT (parse, "converting time -> other not implemented");
1506 } else if (src_format == GST_FORMAT_DEFAULT) {
1507 /* DEFAULT == frame-based */
1508 if (dest_format == GST_FORMAT_TIME) {
1509 GST_DEBUG_OBJECT (parse, "converting default -> time");
1510 if (parse->priv->fps_den) {
1511 *dest_value = gst_util_uint64_scale (src_value,
1512 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1516 GST_DEBUG_OBJECT (parse, "converting default -> other not implemented");
1519 GST_DEBUG_OBJECT (parse, "conversion not implemented");
1526 GST_DEBUG_OBJECT (parse, "no framecount");
1531 GST_DEBUG_OBJECT (parse, "no duration %" G_GUINT64_FORMAT ", bytes %"
1532 G_GUINT64_FORMAT, duration, bytes);
1539 gst_base_parse_update_duration (GstBaseParse * baseparse)
1542 GstBaseParse *parse;
1544 parse = GST_BASE_PARSE (baseparse);
1546 peer = gst_pad_get_peer (parse->sinkpad);
1548 gboolean qres = FALSE;
1549 gint64 ptot, dest_value;
1551 qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot);
1552 gst_object_unref (GST_OBJECT (peer));
1554 if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1555 GST_FORMAT_TIME, &dest_value)) {
1557 /* inform if duration changed, but try to avoid spamming */
1558 parse->priv->estimated_drift +=
1559 dest_value - parse->priv->estimated_duration;
1561 parse->priv->estimated_duration = dest_value;
1562 GST_LOG_OBJECT (parse,
1563 "updated estimated duration to %" GST_TIME_FORMAT,
1564 GST_TIME_ARGS (dest_value));
1566 if (parse->priv->estimated_drift > GST_SECOND ||
1567 parse->priv->estimated_drift < -GST_SECOND) {
1568 gst_element_post_message (GST_ELEMENT (parse),
1569 gst_message_new_duration_changed (GST_OBJECT (parse)));
1570 parse->priv->estimated_drift = 0;
1578 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1579 gboolean post_avg, gboolean post_max)
1581 GstTagList *taglist = NULL;
1583 if (post_min && parse->priv->post_min_bitrate) {
1584 taglist = gst_tag_list_new_empty ();
1586 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1587 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1590 if (post_avg && parse->priv->post_avg_bitrate) {
1591 if (taglist == NULL)
1592 taglist = gst_tag_list_new_empty ();
1594 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1595 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1596 parse->priv->avg_bitrate, NULL);
1599 if (post_max && parse->priv->post_max_bitrate) {
1600 if (taglist == NULL)
1601 taglist = gst_tag_list_new_empty ();
1603 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1604 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1607 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1608 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1609 parse->priv->max_bitrate);
1611 if (taglist != NULL) {
1612 gst_pad_push_event (parse->srcpad, gst_event_new_tag (taglist));
1616 /* gst_base_parse_update_bitrates:
1617 * @parse: #GstBaseParse.
1618 * @buffer: Current frame as a #GstBuffer
1620 * Keeps track of the minimum and maximum bitrates, and also maintains a
1621 * running average bitrate of the stream so far.
1624 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1626 /* Only update the tag on a 10 kbps delta */
1627 static const gint update_threshold = 10000;
1629 guint64 data_len, frame_dur;
1630 gint overhead, frame_bitrate, old_avg_bitrate;
1631 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1632 GstBuffer *buffer = frame->buffer;
1634 overhead = frame->overhead;
1638 data_len = gst_buffer_get_size (buffer) - overhead;
1639 parse->priv->data_bytecount += data_len;
1641 /* duration should be valid by now,
1642 * either set by subclass or maybe based on fps settings */
1643 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1644 /* Calculate duration of a frame from buffer properties */
1645 frame_dur = GST_BUFFER_DURATION (buffer);
1646 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1647 parse->priv->acc_duration;
1650 /* No way to figure out frame duration (is this even possible?) */
1654 /* override if subclass provided bitrate, e.g. metadata based */
1655 if (parse->priv->bitrate) {
1656 parse->priv->avg_bitrate = parse->priv->bitrate;
1657 /* spread this (confirmed) info ASAP */
1658 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1659 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1663 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1667 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1668 parse->priv->avg_bitrate);
1670 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1672 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1673 /* always post all at threshold time */
1674 update_min = update_max = update_avg = TRUE;
1677 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1678 if (frame_bitrate < parse->priv->min_bitrate) {
1679 parse->priv->min_bitrate = frame_bitrate;
1683 if (frame_bitrate > parse->priv->max_bitrate) {
1684 parse->priv->max_bitrate = frame_bitrate;
1688 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1689 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1690 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1695 if ((update_min || update_avg || update_max))
1696 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1703 * gst_base_parse_add_index_entry:
1704 * @parse: #GstBaseParse.
1705 * @offset: offset of entry
1706 * @ts: timestamp associated with offset
1707 * @key: whether entry refers to keyframe
1708 * @force: add entry disregarding sanity checks
1710 * Adds an entry to the index associating @offset to @ts. It is recommended
1711 * to only add keyframe entries. @force allows to bypass checks, such as
1712 * whether the stream is (upstream) seekable, another entry is already "close"
1713 * to the new entry, etc.
1715 * Returns: #gboolean indicating whether entry was added
1718 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1719 GstClockTime ts, gboolean key, gboolean force)
1721 gboolean ret = FALSE;
1722 GstIndexAssociation associations[2];
1724 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1725 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1727 if (G_LIKELY (!force)) {
1729 if (!parse->priv->upstream_seekable) {
1730 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1734 /* FIXME need better helper data structure that handles these issues
1735 * related to ongoing collecting of index entries */
1736 if (parse->priv->index_last_offset + parse->priv->idx_byte_interval >=
1738 GST_LOG_OBJECT (parse,
1739 "already have entries up to offset 0x%08" G_GINT64_MODIFIER "x",
1740 parse->priv->index_last_offset + parse->priv->idx_byte_interval);
1744 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1745 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1746 parse->priv->idx_interval) {
1747 GST_LOG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1748 GST_TIME_ARGS (parse->priv->index_last_ts));
1752 /* if last is not really the last one */
1753 if (!parse->priv->index_last_valid) {
1754 GstClockTime prev_ts;
1756 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1757 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1758 GST_LOG_OBJECT (parse,
1759 "entry too close to existing entry %" GST_TIME_FORMAT,
1760 GST_TIME_ARGS (prev_ts));
1761 parse->priv->index_last_offset = offset;
1762 parse->priv->index_last_ts = ts;
1768 associations[0].format = GST_FORMAT_TIME;
1769 associations[0].value = ts;
1770 associations[1].format = GST_FORMAT_BYTES;
1771 associations[1].value = offset;
1773 /* index might change on-the-fly, although that would be nutty app ... */
1774 GST_BASE_PARSE_INDEX_LOCK (parse);
1775 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1776 (key) ? GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT :
1777 GST_INDEX_ASSOCIATION_FLAG_DELTA_UNIT, 2,
1778 (const GstIndexAssociation *) &associations);
1779 GST_BASE_PARSE_INDEX_UNLOCK (parse);
1782 parse->priv->index_last_offset = offset;
1783 parse->priv->index_last_ts = ts;
1792 /* check for seekable upstream, above and beyond a mere query */
1794 gst_base_parse_check_seekability (GstBaseParse * parse)
1797 gboolean seekable = FALSE;
1798 gint64 start = -1, stop = -1;
1799 guint idx_interval = 0;
1800 guint64 idx_byte_interval = 0;
1802 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1803 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1804 GST_DEBUG_OBJECT (parse, "seeking query failed");
1808 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1810 /* try harder to query upstream size if we didn't get it the first time */
1811 if (seekable && stop == -1) {
1812 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1813 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1816 /* if upstream doesn't know the size, it's likely that it's not seekable in
1817 * practice even if it technically may be seekable */
1818 if (seekable && (start != 0 || stop <= start)) {
1819 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1823 /* let's not put every single frame into our index */
1825 if (stop < 10 * 1024 * 1024)
1827 else if (stop < 100 * 1024 * 1024)
1830 idx_interval = 1000;
1832 /* ensure that even for large files (e.g. very long audio files), the index
1833 * stays reasonably-size, with some arbitrary limit to the total number of
1835 idx_byte_interval = (stop - start) / MAX_INDEX_ENTRIES;
1836 GST_DEBUG_OBJECT (parse,
1837 "Limiting index entries to %d, indexing byte interval %"
1838 G_GUINT64_FORMAT " bytes", MAX_INDEX_ENTRIES, idx_byte_interval);
1842 gst_query_unref (query);
1844 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1845 G_GUINT64_FORMAT ")", seekable, start, stop);
1846 parse->priv->upstream_seekable = seekable;
1847 parse->priv->upstream_size = seekable ? stop : 0;
1849 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1850 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1851 parse->priv->idx_byte_interval = idx_byte_interval;
1854 /* some misc checks on upstream */
1856 gst_base_parse_check_upstream (GstBaseParse * parse)
1860 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
1861 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1862 /* upstream has one, accept it also, and no further updates */
1863 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1864 parse->priv->upstream_has_duration = TRUE;
1867 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1868 parse->priv->upstream_has_duration);
1871 /* checks src caps to determine if dealing with audio or video */
1872 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1874 gst_base_parse_check_media (GstBaseParse * parse)
1879 caps = gst_pad_get_current_caps (parse->srcpad);
1880 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1881 parse->priv->is_video =
1882 g_str_has_prefix (gst_structure_get_name (s), "video");
1884 /* historical default */
1885 parse->priv->is_video = FALSE;
1888 gst_caps_unref (caps);
1890 parse->priv->checked_media = TRUE;
1891 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1894 /* takes ownership of frame */
1896 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1898 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1899 /* frame allocated on the heap, we can just take ownership */
1900 g_queue_push_tail (&parse->priv->queued_frames, frame);
1901 GST_TRACE ("queued frame %p", frame);
1903 GstBaseParseFrame *copy;
1905 /* probably allocated on the stack, must make a proper copy */
1906 copy = gst_base_parse_frame_copy (frame);
1907 g_queue_push_tail (&parse->priv->queued_frames, copy);
1908 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1909 gst_base_parse_frame_free (frame);
1913 /* makes sure that @buf is properly prepared and decorated for passing
1914 * to baseclass, and an equally setup frame is returned setup with @buf.
1915 * Takes ownership of @buf. */
1916 static GstBaseParseFrame *
1917 gst_base_parse_prepare_frame (GstBaseParse * parse, GstBuffer * buffer)
1919 GstBaseParseFrame *frame = NULL;
1921 buffer = gst_buffer_make_writable (buffer);
1923 GST_LOG_OBJECT (parse,
1924 "preparing frame at offset %" G_GUINT64_FORMAT
1925 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
1926 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1927 gst_buffer_get_size (buffer));
1929 if (parse->priv->discont) {
1930 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1931 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1932 parse->priv->discont = FALSE;
1935 GST_BUFFER_OFFSET (buffer) = parse->priv->offset;
1937 frame = gst_base_parse_frame_new (buffer, 0, 0);
1939 /* also ensure to update state flags */
1940 gst_base_parse_frame_update (parse, frame, buffer);
1941 gst_buffer_unref (buffer);
1943 if (parse->priv->prev_offset != parse->priv->offset || parse->priv->new_frame) {
1944 GST_LOG_OBJECT (parse, "marking as new frame");
1945 parse->priv->new_frame = FALSE;
1946 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME;
1949 frame->offset = parse->priv->prev_offset = parse->priv->offset;
1951 /* use default handler to provide initial (upstream) metadata */
1952 gst_base_parse_parse_frame (parse, frame);
1957 /* Wraps buffer in a frame and dispatches to subclass.
1958 * Also manages data skipping and offset handling (including adapter flushing).
1959 * Takes ownership of @buffer */
1960 static GstFlowReturn
1961 gst_base_parse_handle_buffer (GstBaseParse * parse, GstBuffer * buffer,
1962 gint * skip, gint * flushed)
1964 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1965 GstBaseParseFrame *frame;
1968 g_return_val_if_fail (skip != NULL || flushed != NULL, GST_FLOW_ERROR);
1970 GST_LOG_OBJECT (parse,
1971 "handling buffer of size %" G_GSIZE_FORMAT " with dts %" GST_TIME_FORMAT
1972 ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
1973 gst_buffer_get_size (buffer), GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
1974 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
1975 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1977 /* track what is being flushed during this single round of frame processing */
1978 parse->priv->flushed = 0;
1981 /* make it easy for _finish_frame to pick up input data */
1982 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1983 gst_buffer_ref (buffer);
1984 gst_adapter_push (parse->priv->adapter, buffer);
1987 frame = gst_base_parse_prepare_frame (parse, buffer);
1988 ret = klass->handle_frame (parse, frame, skip);
1990 *flushed = parse->priv->flushed;
1992 GST_LOG_OBJECT (parse, "handle_frame skipped %d, flushed %d",
1995 /* subclass can only do one of these, or semantics are too unclear */
1996 g_assert (*skip == 0 || *flushed == 0);
1998 /* track skipping */
2000 GstClockTime pts, dts;
2003 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", *skip);
2004 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2005 /* reverse playback, and no frames found yet, so we are skipping
2006 * the leading part of a fragment, which may form the tail of
2007 * fragment coming later, hopefully subclass skips efficiently ... */
2008 pts = gst_adapter_prev_pts (parse->priv->adapter, NULL);
2009 dts = gst_adapter_prev_dts (parse->priv->adapter, NULL);
2010 outbuf = gst_adapter_take_buffer (parse->priv->adapter, *skip);
2011 outbuf = gst_buffer_make_writable (outbuf);
2012 GST_BUFFER_PTS (outbuf) = pts;
2013 GST_BUFFER_DTS (outbuf) = dts;
2014 parse->priv->buffers_head =
2015 g_slist_prepend (parse->priv->buffers_head, outbuf);
2018 /* If we're asked to skip more than is available in the adapter,
2019 we need to remember what we need to skip for next iteration */
2020 gsize av = gst_adapter_available (parse->priv->adapter);
2021 GST_DEBUG ("Asked to skip %u (%" G_GSIZE_FORMAT " available)", *skip, av);
2023 gst_adapter_flush (parse->priv->adapter, *skip);
2026 ("This is more than available, flushing %" G_GSIZE_FORMAT
2027 ", storing %u to skip", av, (guint) (*skip - av));
2028 parse->priv->skip = *skip - av;
2029 gst_adapter_flush (parse->priv->adapter, av);
2033 if (!parse->priv->discont)
2034 parse->priv->sync_offset = parse->priv->offset;
2035 parse->priv->offset += *skip;
2036 parse->priv->discont = TRUE;
2037 /* check for indefinite skipping */
2038 if (ret == GST_FLOW_OK)
2039 ret = gst_base_parse_check_sync (parse);
2042 parse->priv->offset += *flushed;
2044 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
2045 gst_adapter_clear (parse->priv->adapter);
2048 gst_base_parse_frame_free (frame);
2053 /* gst_base_parse_push_pending_events:
2054 * @parse: #GstBaseParse
2056 * Pushes the pending events
2059 gst_base_parse_push_pending_events (GstBaseParse * parse)
2061 if (G_UNLIKELY (parse->priv->pending_events)) {
2062 GList *r = g_list_reverse (parse->priv->pending_events);
2065 parse->priv->pending_events = NULL;
2066 for (l = r; l != NULL; l = l->next) {
2067 gst_pad_push_event (parse->srcpad, GST_EVENT_CAST (l->data));
2073 /* gst_base_parse_handle_and_push_frame:
2074 * @parse: #GstBaseParse.
2075 * @klass: #GstBaseParseClass.
2076 * @frame: (transfer full): a #GstBaseParseFrame
2078 * Parses the frame from given buffer and pushes it forward. Also performs
2079 * timestamp handling and checks the segment limits.
2081 * This is called with srcpad STREAM_LOCK held.
2083 * Returns: #GstFlowReturn
2085 static GstFlowReturn
2086 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
2087 GstBaseParseFrame * frame)
2092 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2094 buffer = frame->buffer;
2095 offset = frame->offset;
2097 /* check if subclass/format can provide ts.
2098 * If so, that allows and enables extra seek and duration determining options */
2099 if (G_UNLIKELY (parse->priv->first_frame_offset < 0)) {
2100 if (GST_BUFFER_PTS_IS_VALID (buffer) && parse->priv->has_timing_info
2101 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
2102 parse->priv->first_frame_offset = offset;
2103 parse->priv->first_frame_pts = GST_BUFFER_PTS (buffer);
2104 parse->priv->first_frame_dts = GST_BUFFER_DTS (buffer);
2105 GST_DEBUG_OBJECT (parse, "subclass provided dts %" GST_TIME_FORMAT
2106 ", pts %" GST_TIME_FORMAT " for first frame at offset %"
2107 G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->first_frame_dts),
2108 GST_TIME_ARGS (parse->priv->first_frame_pts),
2109 parse->priv->first_frame_offset);
2110 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
2112 GstClockTime last_ts = G_MAXINT64;
2114 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
2115 gst_base_parse_locate_time (parse, &last_ts, &off);
2116 if (GST_CLOCK_TIME_IS_VALID (last_ts))
2117 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
2120 /* disable further checks */
2121 parse->priv->first_frame_offset = 0;
2125 /* track upstream time if provided, not subclass' internal notion of it */
2126 if (parse->priv->upstream_format == GST_FORMAT_TIME) {
2127 GST_BUFFER_PTS (frame->buffer) = GST_CLOCK_TIME_NONE;
2128 GST_BUFFER_DTS (frame->buffer) = GST_CLOCK_TIME_NONE;
2131 /* interpolating and no valid pts yet,
2132 * start with dts and carry on from there */
2133 if (parse->priv->infer_ts && parse->priv->pts_interpolate
2134 && !GST_CLOCK_TIME_IS_VALID (parse->priv->next_pts))
2135 parse->priv->next_pts = parse->priv->next_dts;
2137 /* again use default handler to add missing metadata;
2138 * we may have new information on frame properties */
2139 gst_base_parse_parse_frame (parse, frame);
2141 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
2142 if (GST_BUFFER_DTS_IS_VALID (buffer) && GST_BUFFER_DURATION_IS_VALID (buffer)) {
2143 parse->priv->next_dts =
2144 GST_BUFFER_DTS (buffer) + GST_BUFFER_DURATION (buffer);
2145 if (parse->priv->pts_interpolate && GST_BUFFER_PTS_IS_VALID (buffer)) {
2146 GstClockTime next_pts =
2147 GST_BUFFER_PTS (buffer) + GST_BUFFER_DURATION (buffer);
2148 if (next_pts >= parse->priv->next_dts)
2149 parse->priv->next_pts = next_pts;
2152 /* we lost track, do not produce bogus time next time around
2153 * (probably means parser subclass has given up on parsing as well) */
2154 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
2155 parse->priv->next_dts = GST_CLOCK_TIME_NONE;
2158 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
2159 GST_BUFFER_PTS_IS_VALID (buffer))
2160 gst_base_parse_add_index_entry (parse, offset,
2161 GST_BUFFER_PTS (buffer),
2162 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
2164 /* All OK, push queued frames if there are any */
2165 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
2166 GstBaseParseFrame *queued_frame;
2168 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
2169 gst_base_parse_push_frame (parse, queued_frame);
2170 gst_base_parse_frame_free (queued_frame);
2174 return gst_base_parse_push_frame (parse, frame);
2178 * gst_base_parse_push_frame:
2179 * @parse: #GstBaseParse.
2180 * @frame: (transfer none): a #GstBaseParseFrame
2182 * Pushes the frame's buffer downstream, sends any pending events and
2183 * does some timestamp and segment handling. Takes ownership of
2184 * frame's buffer, though caller retains ownership of @frame.
2186 * This must be called with sinkpad STREAM_LOCK held.
2188 * Returns: #GstFlowReturn
2191 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
2193 GstFlowReturn ret = GST_FLOW_OK;
2194 GstClockTime last_start = GST_CLOCK_TIME_NONE;
2195 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
2196 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
2200 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2201 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
2203 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
2205 buffer = frame->buffer;
2207 GST_LOG_OBJECT (parse,
2208 "processing buffer of size %" G_GSIZE_FORMAT " with dts %" GST_TIME_FORMAT
2209 ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
2210 gst_buffer_get_size (buffer),
2211 GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
2212 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
2213 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
2216 parse->priv->bytecount += frame->size;
2217 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
2218 parse->priv->framecount++;
2219 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
2220 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
2223 /* 0 means disabled */
2224 if (parse->priv->update_interval < 0)
2225 parse->priv->update_interval = 50;
2226 else if (parse->priv->update_interval > 0 &&
2227 (parse->priv->framecount % parse->priv->update_interval) == 0)
2228 gst_base_parse_update_duration (parse);
2230 if (GST_BUFFER_PTS_IS_VALID (buffer))
2231 last_start = last_stop = GST_BUFFER_PTS (buffer);
2232 if (last_start != GST_CLOCK_TIME_NONE
2233 && GST_BUFFER_DURATION_IS_VALID (buffer))
2234 last_stop = last_start + GST_BUFFER_DURATION (buffer);
2236 /* should have caps by now */
2237 if (!gst_pad_has_current_caps (parse->srcpad))
2240 if (G_UNLIKELY (!parse->priv->checked_media)) {
2241 /* have caps; check identity */
2242 gst_base_parse_check_media (parse);
2245 /* Push pending events, including SEGMENT events */
2246 gst_base_parse_push_pending_events (parse);
2248 /* segment adjustment magic; only if we are running the whole show */
2249 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
2250 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
2251 parse->priv->upstream_seekable)) {
2253 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
2254 GST_CLOCK_TIME_IS_VALID (last_start)) {
2255 GstClockTimeDiff diff;
2257 /* only send newsegments with increasing start times,
2258 * otherwise if these go back and forth downstream (sinks) increase
2259 * accumulated time and running_time */
2260 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
2261 if (G_UNLIKELY (diff > 2 * GST_SECOND
2262 && last_start > parse->segment.start
2263 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
2264 || last_start < parse->segment.stop))) {
2266 GST_DEBUG_OBJECT (parse,
2267 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
2268 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
2269 "Sending updated SEGMENT events", diff,
2270 GST_TIME_ARGS (parse->segment.position),
2271 GST_TIME_ARGS (last_start));
2273 /* skip gap FIXME */
2274 gst_pad_push_event (parse->srcpad,
2275 gst_event_new_segment (&parse->segment));
2277 parse->segment.position = last_start;
2282 /* update bitrates and optionally post corresponding tags
2283 * (following newsegment) */
2284 gst_base_parse_update_bitrates (parse, frame);
2286 if (klass->pre_push_frame) {
2287 ret = klass->pre_push_frame (parse, frame);
2289 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
2292 /* take final ownership of frame buffer */
2293 if (frame->out_buffer) {
2294 buffer = frame->out_buffer;
2295 frame->out_buffer = NULL;
2296 gst_buffer_replace (&frame->buffer, NULL);
2298 buffer = frame->buffer;
2299 frame->buffer = NULL;
2302 /* subclass must play nice */
2303 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2305 size = gst_buffer_get_size (buffer);
2307 parse->priv->seen_keyframe |= parse->priv->is_video &&
2308 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
2310 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
2311 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2312 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
2313 GST_BUFFER_TIMESTAMP (buffer) >
2314 parse->segment.stop + parse->priv->lead_out_ts) {
2315 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
2317 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2318 GST_BUFFER_DURATION_IS_VALID (buffer) &&
2319 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
2320 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
2321 parse->priv->lead_in_ts < parse->segment.start) {
2322 if (parse->priv->seen_keyframe) {
2323 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
2326 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
2327 ret = GST_BASE_PARSE_FLOW_DROPPED;
2334 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2335 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2336 gst_buffer_unref (buffer);
2338 } else if (ret == GST_FLOW_OK) {
2339 if (parse->segment.rate > 0.0) {
2340 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2342 ret = gst_pad_push (parse->srcpad, buffer);
2343 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2344 } else if (!parse->priv->disable_passthrough && parse->priv->passthrough) {
2346 /* in backwards playback mode, if on passthrough we need to push buffers
2347 * directly without accumulating them into the buffers_queued as baseparse
2348 * will never check for a DISCONT while on passthrough and those buffers
2349 * will never be pushed.
2351 * also, as we are on reverse playback, it might be possible that
2352 * passthrough might have just been enabled, so make sure to drain the
2353 * buffers_queued list */
2354 if (G_UNLIKELY (parse->priv->buffers_queued != NULL)) {
2355 gst_base_parse_finish_fragment (parse, TRUE);
2356 ret = gst_base_parse_send_buffers (parse);
2359 if (ret == GST_FLOW_OK) {
2360 GST_LOG_OBJECT (parse,
2361 "pushing frame (%" G_GSIZE_FORMAT " bytes) now..", size);
2362 ret = gst_pad_push (parse->srcpad, buffer);
2363 GST_LOG_OBJECT (parse, "frame pushed, flow %s",
2364 gst_flow_get_name (ret));
2366 GST_LOG_OBJECT (parse,
2367 "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s", size,
2368 gst_flow_get_name (ret));
2369 gst_buffer_unref (buffer);
2373 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2375 parse->priv->buffers_queued =
2376 g_slist_prepend (parse->priv->buffers_queued, buffer);
2380 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2381 size, gst_flow_get_name (ret));
2382 gst_buffer_unref (buffer);
2383 /* if we are not sufficiently in control, let upstream decide on EOS */
2384 if (ret == GST_FLOW_EOS && !parse->priv->disable_passthrough &&
2385 (parse->priv->passthrough ||
2386 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2387 !parse->priv->upstream_seekable)))
2391 /* Update current running segment position */
2392 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
2393 parse->segment.position < last_stop)
2394 parse->segment.position = last_stop;
2401 if (GST_PAD_IS_FLUSHING (parse->srcpad))
2402 return GST_FLOW_FLUSHING;
2404 GST_ELEMENT_ERROR (parse, STREAM, DECODE, ("No caps set"), (NULL));
2405 return GST_FLOW_ERROR;
2410 * gst_base_parse_finish_frame:
2411 * @parse: a #GstBaseParse
2412 * @frame: a #GstBaseParseFrame
2413 * @size: consumed input data represented by frame
2415 * Collects parsed data and pushes this downstream.
2416 * Source pad caps must be set when this is called.
2418 * If @frame's out_buffer is set, that will be used as subsequent frame data.
2419 * Otherwise, @size samples will be taken from the input and used for output,
2420 * and the output's metadata (timestamps etc) will be taken as (optionally)
2421 * set by the subclass on @frame's (input) buffer (which is otherwise
2422 * ignored for any but the above purpose/information).
2424 * Note that the latter buffer is invalidated by this call, whereas the
2425 * caller retains ownership of @frame.
2427 * Returns: a #GstFlowReturn that should be escalated to caller (of caller)
2430 gst_base_parse_finish_frame (GstBaseParse * parse, GstBaseParseFrame * frame,
2433 GstFlowReturn ret = GST_FLOW_OK;
2435 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2436 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
2437 g_return_val_if_fail (size > 0 || frame->out_buffer, GST_FLOW_ERROR);
2438 g_return_val_if_fail (gst_adapter_available (parse->priv->adapter) >= size,
2441 GST_LOG_OBJECT (parse, "finished frame at offset %" G_GUINT64_FORMAT ", "
2442 "flushing size %d", frame->offset, size);
2444 /* some one-time start-up */
2445 if (G_UNLIKELY (parse->priv->framecount == 0)) {
2446 gst_base_parse_check_seekability (parse);
2447 gst_base_parse_check_upstream (parse);
2450 parse->priv->flushed += size;
2452 if (parse->priv->scanning && frame->buffer) {
2453 if (!parse->priv->scanned_frame) {
2454 parse->priv->scanned_frame = gst_base_parse_frame_copy (frame);
2459 /* either PUSH or PULL mode arranges for adapter data */
2460 /* ensure output buffer */
2461 if (!frame->out_buffer) {
2462 GstBuffer *src, *dest;
2464 frame->out_buffer = gst_adapter_take_buffer (parse->priv->adapter, size);
2465 dest = frame->out_buffer;
2466 src = frame->buffer;
2467 GST_BUFFER_PTS (dest) = GST_BUFFER_PTS (src);
2468 GST_BUFFER_DTS (dest) = GST_BUFFER_DTS (src);
2469 GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src);
2470 GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src);
2471 GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src);
2472 GST_MINI_OBJECT_FLAGS (dest) = GST_MINI_OBJECT_FLAGS (src);
2474 gst_adapter_flush (parse->priv->adapter, size);
2477 /* use as input for subsequent processing */
2478 gst_buffer_replace (&frame->buffer, frame->out_buffer);
2479 gst_buffer_unref (frame->out_buffer);
2480 frame->out_buffer = NULL;
2482 /* mark input size consumed */
2485 /* subclass might queue frames/data internally if it needs more
2486 * frames to decide on the format, or might request us to queue here. */
2487 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_DROP) {
2488 gst_buffer_replace (&frame->buffer, NULL);
2490 } else if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_QUEUE) {
2491 GstBaseParseFrame *copy;
2493 copy = gst_base_parse_frame_copy (frame);
2494 copy->flags &= ~GST_BASE_PARSE_FRAME_FLAG_QUEUE;
2495 gst_base_parse_queue_frame (parse, copy);
2499 ret = gst_base_parse_handle_and_push_frame (parse, frame);
2505 /* gst_base_parse_drain:
2507 * Drains the adapter until it is empty. It decreases the min_frame_size to
2508 * match the current adapter size and calls chain method until the adapter
2509 * is emptied or chain returns with error.
2512 gst_base_parse_drain (GstBaseParse * parse)
2516 GST_DEBUG_OBJECT (parse, "draining");
2517 parse->priv->drain = TRUE;
2520 avail = gst_adapter_available (parse->priv->adapter);
2524 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2525 NULL) != GST_FLOW_OK) {
2529 /* nothing changed, maybe due to truncated frame; break infinite loop */
2530 if (avail == gst_adapter_available (parse->priv->adapter)) {
2531 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2532 gst_adapter_clear (parse->priv->adapter);
2536 parse->priv->drain = FALSE;
2539 /* gst_base_parse_send_buffers
2541 * Sends buffers collected in send_buffers downstream, and ensures that list
2542 * is empty at the end (errors or not).
2544 static GstFlowReturn
2545 gst_base_parse_send_buffers (GstBaseParse * parse)
2547 GSList *send = NULL;
2549 GstFlowReturn ret = GST_FLOW_OK;
2550 gboolean first = TRUE;
2552 send = parse->priv->buffers_send;
2556 buf = GST_BUFFER_CAST (send->data);
2557 GST_LOG_OBJECT (parse, "pushing buffer %p, dts %"
2558 GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2559 ", offset %" G_GINT64_FORMAT, buf,
2560 GST_TIME_ARGS (GST_BUFFER_DTS (buf)),
2561 GST_TIME_ARGS (GST_BUFFER_PTS (buf)),
2562 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2564 /* Make sure the first buffer is always DISCONT. If we split
2565 * GOPs inside the parser this is otherwise not guaranteed */
2567 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
2571 /* iterate output queue an push downstream */
2572 ret = gst_pad_push (parse->srcpad, buf);
2573 send = g_slist_delete_link (send, send);
2575 /* clear any leftover if error */
2576 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2578 buf = GST_BUFFER_CAST (send->data);
2579 gst_buffer_unref (buf);
2580 send = g_slist_delete_link (send, send);
2585 parse->priv->buffers_send = send;
2590 /* gst_base_parse_start_fragment:
2592 * Prepares for processing a reverse playback (forward) fragment
2593 * by (re)setting proper state variables.
2595 static GstFlowReturn
2596 gst_base_parse_start_fragment (GstBaseParse * parse)
2598 GST_LOG_OBJECT (parse, "starting fragment");
2600 /* invalidate so no fall-back timestamping is performed;
2601 * ok if taken from subclass or upstream */
2602 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
2603 parse->priv->prev_pts = GST_CLOCK_TIME_NONE;
2604 parse->priv->next_dts = GST_CLOCK_TIME_NONE;
2605 parse->priv->prev_dts = GST_CLOCK_TIME_NONE;
2606 /* prevent it hanging around stop all the time */
2607 parse->segment.position = GST_CLOCK_TIME_NONE;
2609 parse->priv->discont = TRUE;
2611 /* head of previous fragment is now pending tail of current fragment */
2612 parse->priv->buffers_pending = parse->priv->buffers_head;
2613 parse->priv->buffers_head = NULL;
2619 /* gst_base_parse_finish_fragment:
2621 * Processes a reverse playback (forward) fragment:
2622 * - append head of last fragment that was skipped to current fragment data
2623 * - drain the resulting current fragment data (i.e. repeated chain)
2624 * - add time/duration (if needed) to frames queued by chain
2625 * - push queued data
2627 static GstFlowReturn
2628 gst_base_parse_finish_fragment (GstBaseParse * parse, gboolean prev_head)
2631 GstFlowReturn ret = GST_FLOW_OK;
2632 gboolean seen_key = FALSE, seen_delta = FALSE;
2634 GST_LOG_OBJECT (parse, "finishing fragment");
2637 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2638 while (parse->priv->buffers_pending) {
2639 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2641 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2642 gst_buffer_get_size (buf));
2643 gst_adapter_push (parse->priv->adapter, buf);
2645 GST_LOG_OBJECT (parse, "discarding head buffer");
2646 gst_buffer_unref (buf);
2648 parse->priv->buffers_pending =
2649 g_slist_delete_link (parse->priv->buffers_pending,
2650 parse->priv->buffers_pending);
2653 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2654 /* initial skipped data is added to buffers_pending */
2655 gst_base_parse_drain (parse);
2657 if (parse->priv->buffers_send) {
2658 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2659 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2662 /* add metadata (if needed to queued buffers */
2663 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2664 GST_TIME_ARGS (parse->priv->last_pts));
2665 while (parse->priv->buffers_queued) {
2666 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2668 /* no touching if upstream or parsing provided time */
2669 if (GST_BUFFER_PTS_IS_VALID (buf)) {
2670 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2671 GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
2672 } else if (GST_BUFFER_DURATION_IS_VALID (buf)) {
2673 if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_pts)) {
2674 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_pts))
2675 parse->priv->last_pts -= GST_BUFFER_DURATION (buf);
2677 parse->priv->last_pts = 0;
2678 GST_BUFFER_PTS (buf) = parse->priv->last_pts;
2679 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2680 GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
2682 if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_dts)) {
2683 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_dts))
2684 parse->priv->last_dts -= GST_BUFFER_DURATION (buf);
2686 parse->priv->last_dts = 0;
2687 GST_BUFFER_DTS (buf) = parse->priv->last_dts;
2688 GST_LOG_OBJECT (parse, "applied dts %" GST_TIME_FORMAT,
2689 GST_TIME_ARGS (GST_BUFFER_DTS (buf)));
2692 /* no idea, very bad */
2693 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2696 parse->priv->last_pts = GST_BUFFER_PTS (buf);
2697 parse->priv->last_dts = GST_BUFFER_DTS (buf);
2699 /* reverse order for ascending sending */
2700 /* send downstream at keyframe not preceded by a keyframe
2701 * (e.g. that should identify start of collection of IDR nals) */
2702 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2704 ret = gst_base_parse_send_buffers (parse);
2705 /* if a problem, throw all to sending */
2706 if (ret != GST_FLOW_OK) {
2707 parse->priv->buffers_send =
2708 g_slist_reverse (parse->priv->buffers_queued);
2709 parse->priv->buffers_queued = NULL;
2719 parse->priv->buffers_send =
2720 g_slist_prepend (parse->priv->buffers_send, buf);
2721 parse->priv->buffers_queued =
2722 g_slist_delete_link (parse->priv->buffers_queued,
2723 parse->priv->buffers_queued);
2726 /* audio may have all marked as keyframe, so arrange to send here. Also
2727 * we might have ended the loop above on a keyframe, in which case we
2729 if (!seen_delta || seen_key)
2730 ret = gst_base_parse_send_buffers (parse);
2732 /* any trailing unused no longer usable (ideally none) */
2733 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2734 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2735 gst_adapter_available (parse->priv->adapter));
2736 gst_adapter_clear (parse->priv->adapter);
2742 /* small helper that checks whether we have been trying to resync too long */
2743 static inline GstFlowReturn
2744 gst_base_parse_check_sync (GstBaseParse * parse)
2746 if (G_UNLIKELY (parse->priv->discont &&
2747 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2748 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2749 ("Failed to parse stream"), (NULL));
2750 return GST_FLOW_ERROR;
2756 static GstFlowReturn
2757 gst_base_parse_process_streamheader (GstBaseParse * parse)
2761 const GValue *value;
2762 GstFlowReturn ret = GST_FLOW_OK;
2764 caps = gst_pad_get_current_caps (GST_BASE_PARSE_SINK_PAD (parse));
2768 str = gst_caps_get_structure (caps, 0);
2769 value = gst_structure_get_value (str, "streamheader");
2773 GST_DEBUG_OBJECT (parse, "Found streamheader field on input caps");
2775 if (GST_VALUE_HOLDS_ARRAY (value)) {
2777 gsize len = gst_value_array_get_size (value);
2779 for (i = 0; i < len; i++) {
2781 gst_value_get_buffer (gst_value_array_get_value (value, i));
2783 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2784 GST_OBJECT_CAST (parse), gst_buffer_ref (buffer));
2787 } else if (GST_VALUE_HOLDS_BUFFER (value)) {
2788 GstBuffer *buffer = gst_value_get_buffer (value);
2790 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2791 GST_OBJECT_CAST (parse), gst_buffer_ref (buffer));
2794 gst_caps_unref (caps);
2801 gst_caps_unref (caps);
2804 GST_DEBUG_OBJECT (parse, "No streamheader on caps");
2809 static GstFlowReturn
2810 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
2812 GstBaseParseClass *bclass;
2813 GstBaseParse *parse;
2814 GstFlowReturn ret = GST_FLOW_OK;
2815 GstFlowReturn old_ret = GST_FLOW_OK;
2816 GstBuffer *tmpbuf = NULL;
2821 GstClockTime pts, dts;
2823 parse = GST_BASE_PARSE (parent);
2824 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2825 GST_DEBUG_OBJECT (parent, "chain");
2827 /* early out for speed, if we need to skip */
2828 if (buffer && GST_BUFFER_IS_DISCONT (buffer))
2829 parse->priv->skip = 0;
2830 if (parse->priv->skip > 0) {
2831 gsize bsize = gst_buffer_get_size (buffer);
2832 GST_DEBUG ("Got %" G_GSIZE_FORMAT " buffer, need to skip %u", bsize,
2834 if (parse->priv->skip >= bsize) {
2835 parse->priv->skip -= bsize;
2836 GST_DEBUG ("All the buffer is skipped");
2837 parse->priv->offset += bsize;
2838 parse->priv->sync_offset = parse->priv->offset;
2841 buffer = gst_buffer_make_writable (buffer);
2842 gst_buffer_resize (buffer, parse->priv->skip, bsize - parse->priv->skip);
2843 parse->priv->offset += parse->priv->skip;
2844 GST_DEBUG ("Done skipping, we have %u left on this buffer",
2845 (unsigned) (bsize - parse->priv->skip));
2846 parse->priv->skip = 0;
2847 parse->priv->discont = TRUE;
2850 if (G_UNLIKELY (parse->priv->first_buffer)) {
2851 parse->priv->first_buffer = FALSE;
2852 if (!GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_HEADER)) {
2853 /* this stream has no header buffers, check if we just prepend the
2854 * streamheader from caps to the stream */
2855 GST_DEBUG_OBJECT (parse, "Looking for streamheader field on caps to "
2856 "prepend to the stream");
2857 gst_base_parse_process_streamheader (parse);
2859 GST_DEBUG_OBJECT (parse, "Stream has header buffers, not prepending "
2860 "streamheader from caps");
2864 if (parse->priv->detecting) {
2865 GstBuffer *detect_buf;
2867 if (parse->priv->detect_buffers_size == 0) {
2868 detect_buf = gst_buffer_ref (buffer);
2873 detect_buf = gst_buffer_new ();
2875 for (l = parse->priv->detect_buffers; l; l = l->next) {
2876 gsize tmpsize = gst_buffer_get_size (l->data);
2878 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
2879 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
2883 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
2884 offset, gst_buffer_get_size (buffer));
2887 ret = bclass->detect (parse, detect_buf);
2888 gst_buffer_unref (detect_buf);
2890 if (ret == GST_FLOW_OK) {
2893 /* Detected something */
2894 parse->priv->detecting = FALSE;
2896 for (l = parse->priv->detect_buffers; l; l = l->next) {
2897 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2899 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2900 parent, GST_BUFFER_CAST (l->data));
2902 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2904 g_list_free (parse->priv->detect_buffers);
2905 parse->priv->detect_buffers = NULL;
2906 parse->priv->detect_buffers_size = 0;
2908 if (ret != GST_FLOW_OK) {
2912 /* Handle the current buffer */
2913 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2914 /* Still detecting, append buffer or error out if draining */
2916 if (parse->priv->drain) {
2917 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2918 return GST_FLOW_ERROR;
2919 } else if (parse->priv->flushing) {
2920 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2922 g_list_free (parse->priv->detect_buffers);
2923 parse->priv->detect_buffers = NULL;
2924 parse->priv->detect_buffers_size = 0;
2926 parse->priv->detect_buffers =
2927 g_list_append (parse->priv->detect_buffers, buffer);
2928 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
2932 /* Something went wrong, subclass responsible for error reporting */
2936 /* And now handle the current buffer if detection worked */
2939 if (G_LIKELY (buffer)) {
2940 GST_LOG_OBJECT (parse,
2941 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT
2942 ", dts %" GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT,
2943 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer),
2944 GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
2945 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)));
2947 if (G_UNLIKELY (!parse->priv->disable_passthrough
2948 && parse->priv->passthrough)) {
2949 GstBaseParseFrame frame;
2951 gst_base_parse_frame_init (&frame);
2952 frame.buffer = gst_buffer_make_writable (buffer);
2953 ret = gst_base_parse_push_frame (parse, &frame);
2954 gst_base_parse_frame_free (&frame);
2957 /* upstream feeding us in reverse playback;
2958 * finish previous fragment and start new upon DISCONT */
2959 if (parse->segment.rate < 0.0) {
2960 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2961 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2962 ret = gst_base_parse_finish_fragment (parse, TRUE);
2963 gst_base_parse_start_fragment (parse);
2966 gst_adapter_push (parse->priv->adapter, buffer);
2969 /* Parse and push as many frames as possible */
2970 /* Stop either when adapter is empty or we are flushing */
2971 while (!parse->priv->flushing) {
2974 /* note: if subclass indicates MAX fsize,
2975 * this will not likely be available anyway ... */
2976 min_size = MAX (parse->priv->min_frame_size, fsize);
2977 av = gst_adapter_available (parse->priv->adapter);
2979 if (G_UNLIKELY (parse->priv->drain)) {
2981 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2982 if (G_UNLIKELY (!min_size)) {
2987 /* Collect at least min_frame_size bytes */
2988 if (av < min_size) {
2989 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)", av);
2993 /* move along with upstream timestamp (if any),
2994 * but interpolate in between */
2995 pts = gst_adapter_prev_pts (parse->priv->adapter, NULL);
2996 dts = gst_adapter_prev_dts (parse->priv->adapter, NULL);
2997 if (GST_CLOCK_TIME_IS_VALID (pts) && (parse->priv->prev_pts != pts))
2998 parse->priv->prev_pts = parse->priv->next_pts = pts;
3000 if (GST_CLOCK_TIME_IS_VALID (dts) && (parse->priv->prev_dts != dts))
3001 parse->priv->prev_dts = parse->priv->next_dts = dts;
3003 /* we can mess with, erm interpolate, timestamps,
3004 * and incoming stuff has PTS but no DTS seen so far,
3005 * then pick up DTS from PTS and hope for the best ... */
3006 if (parse->priv->infer_ts &&
3007 parse->priv->pts_interpolate &&
3008 !GST_CLOCK_TIME_IS_VALID (dts) &&
3009 !GST_CLOCK_TIME_IS_VALID (parse->priv->prev_dts) &&
3010 GST_CLOCK_TIME_IS_VALID (pts))
3011 parse->priv->next_dts = pts;
3013 /* always pass all available data */
3014 data = gst_adapter_map (parse->priv->adapter, av);
3015 /* arrange for actual data to be copied if subclass tries to,
3016 * since what is passed is tied to the adapter */
3017 tmpbuf = gst_buffer_new_wrapped_full (GST_MEMORY_FLAG_READONLY |
3018 GST_MEMORY_FLAG_NO_SHARE, (gpointer) data, av, 0, av, NULL, NULL);
3020 /* already inform subclass what timestamps we have planned,
3021 * at least if provided by time-based upstream */
3022 if (parse->priv->upstream_format == GST_FORMAT_TIME) {
3023 GST_BUFFER_PTS (tmpbuf) = parse->priv->next_pts;
3024 GST_BUFFER_DTS (tmpbuf) = parse->priv->next_dts;
3027 /* keep the adapter mapped, so keep track of what has to be flushed */
3028 ret = gst_base_parse_handle_buffer (parse, tmpbuf, &skip, &flush);
3031 /* probably already implicitly unmapped due to adapter operation,
3032 * but for good measure ... */
3033 gst_adapter_unmap (parse->priv->adapter);
3034 if (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED) {
3037 if (skip == 0 && flush == 0) {
3038 GST_LOG_OBJECT (parse, "nothing skipped and no frames finished, "
3039 "breaking to get more data");
3040 /* ignore this return as it produced no data */
3048 GST_LOG_OBJECT (parse, "chain leaving");
3052 /* pull @size bytes at current offset,
3053 * i.e. at least try to and possibly return a shorter buffer if near the end */
3054 static GstFlowReturn
3055 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
3056 GstBuffer ** buffer)
3058 GstFlowReturn ret = GST_FLOW_OK;
3060 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
3062 /* Caching here actually makes much less difference than one would expect.
3063 * We do it mainly to avoid pulling buffers of 1 byte all the time */
3064 if (parse->priv->cache) {
3065 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
3066 gint cache_size = gst_buffer_get_size (parse->priv->cache);
3068 if (cache_offset <= parse->priv->offset &&
3069 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
3070 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
3071 parse->priv->offset - cache_offset, size);
3072 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
3075 /* not enough data in the cache, free cache and get a new one */
3076 gst_buffer_unref (parse->priv->cache);
3077 parse->priv->cache = NULL;
3080 /* refill the cache */
3082 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
3083 64 * 1024), &parse->priv->cache);
3084 if (ret != GST_FLOW_OK) {
3085 parse->priv->cache = NULL;
3089 if (gst_buffer_get_size (parse->priv->cache) >= size) {
3091 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
3093 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
3097 /* Not possible to get enough data, try a last time with
3098 * requesting exactly the size we need */
3099 gst_buffer_unref (parse->priv->cache);
3100 parse->priv->cache = NULL;
3102 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
3103 &parse->priv->cache);
3105 if (ret != GST_FLOW_OK) {
3106 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
3111 if (gst_buffer_get_size (parse->priv->cache) < size) {
3112 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
3113 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
3114 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
3116 *buffer = parse->priv->cache;
3117 parse->priv->cache = NULL;
3123 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
3124 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
3129 static GstFlowReturn
3130 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
3133 GstClockTime ts = 0;
3137 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
3138 ", last_offset = %" G_GINT64_FORMAT,
3139 GST_TIME_ARGS (parse->priv->last_pts), parse->priv->last_offset);
3141 if (!parse->priv->last_offset
3142 || parse->priv->last_pts <= parse->segment.start) {
3143 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
3144 GST_TIME_ARGS (parse->segment.start));
3149 /* last fragment started at last_offset / last_ts;
3150 * seek back 10s capped at 1MB */
3151 if (parse->priv->last_pts >= 10 * GST_SECOND)
3152 ts = parse->priv->last_pts - 10 * GST_SECOND;
3153 /* if we are exact now, we will be more so going backwards */
3154 if (parse->priv->exact_position) {
3155 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
3157 if (!gst_base_parse_convert (parse, GST_FORMAT_TIME, ts,
3158 GST_FORMAT_BYTES, &offset)) {
3159 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
3162 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
3163 parse->priv->last_offset - 1024);
3164 offset = MAX (0, offset);
3166 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
3168 parse->priv->offset = offset;
3170 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
3172 if (ret != GST_FLOW_OK)
3175 /* offset will increase again as fragment is processed/parsed */
3176 parse->priv->last_offset = offset;
3178 gst_base_parse_start_fragment (parse);
3179 gst_adapter_push (parse->priv->adapter, buffer);
3180 ret = gst_base_parse_finish_fragment (parse, TRUE);
3181 if (ret != GST_FLOW_OK)
3184 /* force previous fragment */
3185 parse->priv->offset = -1;
3192 * pull and scan for next frame starting from current offset
3193 * ajusts sync, drain and offset going along */
3194 static GstFlowReturn
3195 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass)
3198 GstFlowReturn ret = GST_FLOW_OK;
3199 guint fsize, min_size;
3203 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
3204 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
3206 /* let's make this efficient for all subclass once and for all;
3207 * maybe it does not need this much, but in the latter case, we know we are
3208 * in pull mode here and might as well try to read and supply more anyway
3209 * (so does the buffer caching mechanism) */
3213 min_size = MAX (parse->priv->min_frame_size, fsize);
3215 GST_LOG_OBJECT (parse, "reading buffer size %u", min_size);
3217 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
3218 if (ret != GST_FLOW_OK)
3221 /* if we got a short read, inform subclass we are draining leftover
3222 * and no more is to be expected */
3223 if (gst_buffer_get_size (buffer) < min_size) {
3224 GST_LOG_OBJECT (parse, "... but did not get that; marked draining");
3225 parse->priv->drain = TRUE;
3228 if (parse->priv->detecting) {
3229 ret = klass->detect (parse, buffer);
3230 if (ret == GST_FLOW_NOT_NEGOTIATED) {
3231 /* If draining we error out, otherwise request a buffer
3233 if (parse->priv->drain) {
3234 gst_buffer_unref (buffer);
3235 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
3236 return GST_FLOW_ERROR;
3239 gst_buffer_unref (buffer);
3242 } else if (ret != GST_FLOW_OK) {
3243 gst_buffer_unref (buffer);
3244 GST_ERROR_OBJECT (parse, "detect() returned %s",
3245 gst_flow_get_name (ret));
3249 /* Else handle this buffer normally */
3252 ret = gst_base_parse_handle_buffer (parse, buffer, &skip, &flushed);
3253 if (ret != GST_FLOW_OK)
3256 /* If a large amount of data was requested to be skipped, _handle_buffer
3257 might have set the priv->skip flag to an extra amount on top of skip.
3258 In pull mode, we can just pull from the new offset directly. */
3259 parse->priv->offset += parse->priv->skip;
3260 parse->priv->skip = 0;
3262 /* something flushed means something happened,
3263 * and we should bail out of this loop so as not to occupy
3264 * the task thread indefinitely */
3266 GST_LOG_OBJECT (parse, "frame finished, breaking loop");
3269 /* nothing flushed, no skip and draining, so nothing left to do */
3270 if (!skip && parse->priv->drain) {
3271 GST_LOG_OBJECT (parse, "no activity or result when draining; "
3272 "breaking loop and marking EOS");
3276 /* otherwise, get some more data
3277 * note that is checked this does not happen indefinitely */
3279 GST_LOG_OBJECT (parse, "getting some more data");
3282 parse->priv->drain = FALSE;
3289 /* Loop that is used in pull mode to retrieve data from upstream */
3291 gst_base_parse_loop (GstPad * pad)
3293 GstBaseParse *parse;
3294 GstBaseParseClass *klass;
3295 GstFlowReturn ret = GST_FLOW_OK;
3297 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
3298 klass = GST_BASE_PARSE_GET_CLASS (parse);
3300 GST_LOG_OBJECT (parse, "Entering parse loop");
3302 if (G_UNLIKELY (parse->priv->push_stream_start)) {
3307 gst_pad_create_stream_id (parse->srcpad, GST_ELEMENT_CAST (parse),
3310 event = gst_event_new_stream_start (stream_id);
3311 gst_event_set_group_id (event, gst_util_group_id_next ());
3313 GST_DEBUG_OBJECT (parse, "Pushing STREAM_START");
3314 gst_pad_push_event (parse->srcpad, event);
3315 parse->priv->push_stream_start = FALSE;
3319 /* reverse playback:
3320 * first fragment (closest to stop time) is handled normally below,
3321 * then we pull in fragments going backwards */
3322 if (parse->segment.rate < 0.0) {
3323 /* check if we jumped back to a previous fragment,
3324 * which is a post-first fragment */
3325 if (parse->priv->offset < 0) {
3326 ret = gst_base_parse_handle_previous_fragment (parse);
3331 ret = gst_base_parse_scan_frame (parse, klass);
3332 if (ret != GST_FLOW_OK)
3335 /* eat expected eos signalling past segment in reverse playback */
3336 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
3337 parse->segment.position >= parse->segment.stop) {
3338 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
3339 /* push what was accumulated during loop run */
3340 gst_base_parse_finish_fragment (parse, FALSE);
3341 /* force previous fragment */
3342 parse->priv->offset = -1;
3347 if (ret == GST_FLOW_EOS)
3349 else if (ret != GST_FLOW_OK)
3352 gst_object_unref (parse);
3359 GST_DEBUG_OBJECT (parse, "eos");
3364 gboolean push_eos = FALSE;
3366 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
3367 gst_flow_get_name (ret));
3368 gst_pad_pause_task (parse->sinkpad);
3370 if (ret == GST_FLOW_EOS) {
3371 /* handle end-of-stream/segment */
3372 if (parse->segment.flags & GST_SEGMENT_FLAG_SEGMENT) {
3375 if ((stop = parse->segment.stop) == -1)
3376 stop = parse->segment.duration;
3378 GST_DEBUG_OBJECT (parse, "sending segment_done");
3380 gst_element_post_message
3381 (GST_ELEMENT_CAST (parse),
3382 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
3383 GST_FORMAT_TIME, stop));
3384 gst_pad_push_event (parse->srcpad,
3385 gst_event_new_segment_done (GST_FORMAT_TIME, stop));
3387 /* If we STILL have zero frames processed, fire an error */
3388 if (parse->priv->framecount == 0) {
3389 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
3390 ("No valid frames found before end of stream"), (NULL));
3394 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
3395 /* for fatal errors we post an error message, wrong-state is
3396 * not fatal because it happens due to flushes and only means
3397 * that we should stop now. */
3398 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
3399 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
3403 /* Push pending events, including SEGMENT events */
3404 gst_base_parse_push_pending_events (parse);
3406 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
3408 gst_object_unref (parse);
3413 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
3415 GstSchedulingFlags sched_flags;
3416 GstBaseParse *parse;
3420 parse = GST_BASE_PARSE (parent);
3422 GST_DEBUG_OBJECT (parse, "sink activate");
3424 query = gst_query_new_scheduling ();
3425 if (!gst_pad_peer_query (sinkpad, query)) {
3426 gst_query_unref (query);
3427 goto baseparse_push;
3430 gst_query_parse_scheduling (query, &sched_flags, NULL, NULL, NULL);
3432 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL)
3433 && ((sched_flags & GST_SCHEDULING_FLAG_SEEKABLE) != 0);
3435 gst_query_unref (query);
3438 goto baseparse_push;
3440 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
3441 if (!gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE))
3442 goto baseparse_push;
3444 parse->priv->push_stream_start = TRUE;
3446 return gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop,
3451 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
3452 return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
3457 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
3459 GstBaseParseClass *klass;
3460 gboolean result = TRUE;
3462 GST_DEBUG_OBJECT (parse, "activate %d", active);
3464 klass = GST_BASE_PARSE_GET_CLASS (parse);
3467 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
3468 result = klass->start (parse);
3470 /* If the subclass implements ::detect we want to
3471 * call it for the first buffers now */
3472 parse->priv->detecting = (klass->detect != NULL);
3474 /* We must make sure streaming has finished before resetting things
3475 * and calling the ::stop vfunc */
3476 GST_PAD_STREAM_LOCK (parse->sinkpad);
3477 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3479 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
3480 result = klass->stop (parse);
3482 parse->priv->pad_mode = GST_PAD_MODE_NONE;
3484 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
3489 gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
3490 GstPadMode mode, gboolean active)
3493 GstBaseParse *parse;
3495 parse = GST_BASE_PARSE (parent);
3497 GST_DEBUG_OBJECT (parse, "sink %sactivate in %s mode",
3498 (active) ? "" : "de", gst_pad_mode_get_name (mode));
3500 if (!gst_base_parse_activate (parse, active))
3501 goto activate_failed;
3504 case GST_PAD_MODE_PULL:
3506 parse->priv->pending_events =
3507 g_list_prepend (parse->priv->pending_events,
3508 gst_event_new_segment (&parse->segment));
3511 result = gst_pad_stop_task (pad);
3519 parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
3521 GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
3528 GST_DEBUG_OBJECT (parse, "activate failed");
3534 * gst_base_parse_set_duration:
3535 * @parse: #GstBaseParse.
3537 * @duration: duration value.
3538 * @interval: how often to update the duration estimate based on bitrate, or 0.
3540 * Sets the duration of the currently playing media. Subclass can use this
3541 * when it is able to determine duration and/or notices a change in the media
3542 * duration. Alternatively, if @interval is non-zero (default), then stream
3543 * duration is determined based on estimated bitrate, and updated every @interval
3547 gst_base_parse_set_duration (GstBaseParse * parse,
3548 GstFormat fmt, gint64 duration, gint interval)
3550 g_return_if_fail (parse != NULL);
3552 if (parse->priv->upstream_has_duration) {
3553 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3557 if (duration != parse->priv->duration) {
3560 m = gst_message_new_duration_changed (GST_OBJECT (parse));
3561 gst_element_post_message (GST_ELEMENT (parse), m);
3563 /* TODO: what about duration tag? */
3565 parse->priv->duration = duration;
3566 parse->priv->duration_fmt = fmt;
3567 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3568 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3569 if (interval != 0) {
3570 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3574 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3575 parse->priv->update_interval = interval;
3581 * gst_base_parse_set_average_bitrate:
3582 * @parse: #GstBaseParse.
3583 * @bitrate: average bitrate in bits/second
3585 * Optionally sets the average bitrate detected in media (if non-zero),
3586 * e.g. based on metadata, as it will be posted to the application.
3588 * By default, announced average bitrate is estimated. The average bitrate
3589 * is used to estimate the total duration of the stream and to estimate
3590 * a seek position, if there's no index and the format is syncable
3591 * (see gst_base_parse_set_syncable()).
3594 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3596 parse->priv->bitrate = bitrate;
3597 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3601 * gst_base_parse_set_min_frame_size:
3602 * @parse: #GstBaseParse.
3603 * @min_size: Minimum size of the data that this base class should give to
3606 * Subclass can use this function to tell the base class that it needs to
3607 * give at least #min_size buffers.
3610 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3612 g_return_if_fail (parse != NULL);
3614 parse->priv->min_frame_size = min_size;
3615 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3619 * gst_base_parse_set_frame_rate:
3620 * @parse: the #GstBaseParse to set
3621 * @fps_num: frames per second (numerator).
3622 * @fps_den: frames per second (denominator).
3623 * @lead_in: frames needed before a segment for subsequent decode
3624 * @lead_out: frames needed after a segment
3626 * If frames per second is configured, parser can take care of buffer duration
3627 * and timestamping. When performing segment clipping, or seeking to a specific
3628 * location, a corresponding decoder might need an initial @lead_in and a
3629 * following @lead_out number of frames to ensure the desired segment is
3630 * entirely filled upon decoding.
3633 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3634 guint fps_den, guint lead_in, guint lead_out)
3636 g_return_if_fail (parse != NULL);
3638 parse->priv->fps_num = fps_num;
3639 parse->priv->fps_den = fps_den;
3640 if (!fps_num || !fps_den) {
3641 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3643 fps_num = fps_den = 0;
3644 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3645 parse->priv->lead_in = parse->priv->lead_out = 0;
3646 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3648 parse->priv->frame_duration =
3649 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3650 parse->priv->lead_in = lead_in;
3651 parse->priv->lead_out = lead_out;
3652 parse->priv->lead_in_ts =
3653 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3654 parse->priv->lead_out_ts =
3655 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3656 /* aim for about 1.5s to estimate duration */
3657 if (parse->priv->update_interval < 0) {
3658 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3659 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3660 parse->priv->update_interval);
3663 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3664 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3665 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3666 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3667 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3668 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3672 * gst_base_parse_set_has_timing_info:
3673 * @parse: a #GstBaseParse
3674 * @has_timing: whether frames carry timing information
3676 * Set if frames carry timing information which the subclass can (generally)
3677 * parse and provide. In particular, intrinsic (rather than estimated) time
3678 * can be obtained following a seek.
3681 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3683 parse->priv->has_timing_info = has_timing;
3684 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3688 * gst_base_parse_set_syncable:
3689 * @parse: a #GstBaseParse
3690 * @syncable: set if frame starts can be identified
3692 * Set if frame starts can be identified. This is set by default and
3693 * determines whether seeking based on bitrate averages
3694 * is possible for a format/stream.
3697 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3699 parse->priv->syncable = syncable;
3700 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3704 * gst_base_parse_set_passthrough:
3705 * @parse: a #GstBaseParse
3706 * @passthrough: %TRUE if parser should run in passthrough mode
3708 * Set if the nature of the format or configuration does not allow (much)
3709 * parsing, and the parser should operate in passthrough mode (which only
3710 * applies when operating in push mode). That is, incoming buffers are
3711 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3712 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3713 * so subclass can perform as much or as little is appropriate for
3714 * passthrough semantics in @pre_push_frame.
3717 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3719 parse->priv->passthrough = passthrough;
3720 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3724 * gst_base_parse_set_pts_interpolation:
3725 * @parse: a #GstBaseParse
3726 * @pts_interpolate: %TRUE if parser should interpolate PTS timestamps
3728 * By default, the base class will guess PTS timestamps using a simple
3729 * interpolation (previous timestamp + duration), which is incorrect for
3730 * data streams with reordering, where PTS can go backward. Sub-classes
3731 * implementing such formats should disable PTS interpolation.
3734 gst_base_parse_set_pts_interpolation (GstBaseParse * parse,
3735 gboolean pts_interpolate)
3737 parse->priv->pts_interpolate = pts_interpolate;
3738 GST_INFO_OBJECT (parse, "PTS interpolation: %s",
3739 (pts_interpolate) ? "yes" : "no");
3743 * gst_base_parse_set_infer_ts:
3744 * @parse: a #GstBaseParse
3745 * @infer_ts: %TRUE if parser should infer DTS/PTS from each other
3747 * By default, the base class might try to infer PTS from DTS and vice
3748 * versa. While this is generally correct for audio data, it may not
3749 * be otherwise. Sub-classes implementing such formats should disable
3750 * timestamp inferring.
3753 gst_base_parse_set_infer_ts (GstBaseParse * parse, gboolean infer_ts)
3755 parse->priv->infer_ts = infer_ts;
3756 GST_INFO_OBJECT (parse, "TS inferring: %s", (infer_ts) ? "yes" : "no");
3760 * gst_base_parse_set_latency:
3761 * @parse: a #GstBaseParse
3762 * @min_latency: minimum parse latency
3763 * @max_latency: maximum parse latency
3765 * Sets the minimum and maximum (which may likely be equal) latency introduced
3766 * by the parsing process. If there is such a latency, which depends on the
3767 * particular parsing of the format, it typically corresponds to 1 frame duration.
3770 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3771 GstClockTime max_latency)
3773 g_return_if_fail (min_latency != GST_CLOCK_TIME_NONE);
3774 g_return_if_fail (min_latency <= max_latency);
3776 GST_OBJECT_LOCK (parse);
3777 parse->priv->min_latency = min_latency;
3778 parse->priv->max_latency = max_latency;
3779 GST_OBJECT_UNLOCK (parse);
3780 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3781 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3782 GST_TIME_ARGS (max_latency));
3786 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3787 GstClockTime * duration)
3789 gboolean res = FALSE;
3791 g_return_val_if_fail (duration != NULL, FALSE);
3793 *duration = GST_CLOCK_TIME_NONE;
3794 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3795 GST_LOG_OBJECT (parse, "using provided duration");
3796 *duration = parse->priv->duration;
3798 } else if (parse->priv->duration != -1) {
3799 GST_LOG_OBJECT (parse, "converting provided duration");
3800 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3801 parse->priv->duration, format, (gint64 *) duration);
3802 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3803 GST_LOG_OBJECT (parse, "using estimated duration");
3804 *duration = parse->priv->estimated_duration;
3807 GST_LOG_OBJECT (parse, "cannot estimate duration");
3810 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3811 GST_TIME_ARGS (*duration));
3816 gst_base_parse_src_query_default (GstBaseParse * parse, GstQuery * query)
3818 gboolean res = FALSE;
3821 pad = GST_BASE_PARSE_SRC_PAD (parse);
3823 switch (GST_QUERY_TYPE (query)) {
3824 case GST_QUERY_POSITION:
3829 GST_DEBUG_OBJECT (parse, "position query");
3830 gst_query_parse_position (query, &format, NULL);
3832 /* try upstream first */
3833 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
3835 /* Fall back on interpreting segment */
3836 GST_OBJECT_LOCK (parse);
3837 if (format == GST_FORMAT_BYTES) {
3838 dest_value = parse->priv->offset;
3840 } else if (format == parse->segment.format &&
3841 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
3842 dest_value = gst_segment_to_stream_time (&parse->segment,
3843 parse->segment.format, parse->segment.position);
3846 GST_OBJECT_UNLOCK (parse);
3848 /* no precise result, upstream no idea either, then best estimate */
3849 /* priv->offset is updated in both PUSH/PULL modes */
3850 res = gst_base_parse_convert (parse,
3851 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3854 gst_query_set_position (query, format, dest_value);
3858 case GST_QUERY_DURATION:
3861 GstClockTime duration;
3863 GST_DEBUG_OBJECT (parse, "duration query");
3864 gst_query_parse_duration (query, &format, NULL);
3866 /* consult upstream */
3867 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
3869 /* otherwise best estimate from us */
3871 res = gst_base_parse_get_duration (parse, format, &duration);
3873 gst_query_set_duration (query, format, duration);
3877 case GST_QUERY_SEEKING:
3880 GstClockTime duration = GST_CLOCK_TIME_NONE;
3881 gboolean seekable = FALSE;
3883 GST_DEBUG_OBJECT (parse, "seeking query");
3884 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3886 /* consult upstream */
3887 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
3889 /* we may be able to help if in TIME */
3890 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3891 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3892 /* already OK if upstream takes care */
3893 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3895 if (!(res && seekable)) {
3896 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3897 || duration == -1) {
3898 /* seekable if we still have a chance to get duration later on */
3900 parse->priv->upstream_seekable && parse->priv->update_interval;
3902 seekable = parse->priv->upstream_seekable;
3903 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3906 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3912 case GST_QUERY_FORMATS:
3913 gst_query_set_formatsv (query, 3, fmtlist);
3916 case GST_QUERY_CONVERT:
3918 GstFormat src_format, dest_format;
3919 gint64 src_value, dest_value;
3921 gst_query_parse_convert (query, &src_format, &src_value,
3922 &dest_format, &dest_value);
3924 res = gst_base_parse_convert (parse, src_format, src_value,
3925 dest_format, &dest_value);
3927 gst_query_set_convert (query, src_format, src_value,
3928 dest_format, dest_value);
3932 case GST_QUERY_LATENCY:
3934 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3936 GstClockTime min_latency, max_latency;
3938 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3939 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3940 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3941 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3943 GST_OBJECT_LOCK (parse);
3944 /* add our latency */
3945 min_latency += parse->priv->min_latency;
3946 if (max_latency == -1 || parse->priv->max_latency == -1)
3949 max_latency += parse->priv->max_latency;
3950 GST_OBJECT_UNLOCK (parse);
3952 gst_query_set_latency (query, live, min_latency, max_latency);
3956 case GST_QUERY_SEGMENT:
3961 format = parse->segment.format;
3964 gst_segment_to_stream_time (&parse->segment, format,
3965 parse->segment.start);
3966 if ((stop = parse->segment.stop) == -1)
3967 stop = parse->segment.duration;
3969 stop = gst_segment_to_stream_time (&parse->segment, format, stop);
3971 gst_query_set_segment (query, parse->segment.rate, format, start, stop);
3976 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
3982 /* scans for a cluster start from @pos,
3983 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3984 static GstFlowReturn
3985 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3986 GstClockTime * time, GstClockTime * duration)
3988 GstBaseParseClass *klass;
3990 gboolean orig_drain, orig_discont;
3991 GstFlowReturn ret = GST_FLOW_OK;
3992 GstBuffer *buf = NULL;
3993 GstBaseParseFrame *sframe = NULL;
3995 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3996 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3997 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3999 klass = GST_BASE_PARSE_GET_CLASS (parse);
4001 *time = GST_CLOCK_TIME_NONE;
4002 *duration = GST_CLOCK_TIME_NONE;
4005 orig_offset = parse->priv->offset;
4006 orig_discont = parse->priv->discont;
4007 orig_drain = parse->priv->drain;
4009 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
4010 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
4012 /* jump elsewhere and locate next frame */
4013 parse->priv->offset = *pos;
4014 /* mark as scanning so frames don't get processed all the way */
4015 parse->priv->scanning = TRUE;
4016 ret = gst_base_parse_scan_frame (parse, klass);
4017 parse->priv->scanning = FALSE;
4018 /* retrieve frame found during scan */
4019 sframe = parse->priv->scanned_frame;
4020 parse->priv->scanned_frame = NULL;
4022 if (ret != GST_FLOW_OK || !sframe)
4025 /* get offset first, subclass parsing might dump other stuff in there */
4026 *pos = sframe->offset;
4027 buf = sframe->buffer;
4030 /* but it should provide proper time */
4031 *time = GST_BUFFER_TIMESTAMP (buf);
4032 *duration = GST_BUFFER_DURATION (buf);
4034 GST_LOG_OBJECT (parse,
4035 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
4036 GST_TIME_ARGS (*time), *pos);
4040 gst_base_parse_frame_free (sframe);
4043 parse->priv->offset = orig_offset;
4044 parse->priv->discont = orig_discont;
4045 parse->priv->drain = orig_drain;
4050 /* bisect and scan through file for frame starting before @time,
4051 * returns OK and @time/@offset if found, NONE and/or error otherwise
4052 * If @time == G_MAXINT64, scan for duration ( == last frame) */
4053 static GstFlowReturn
4054 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
4057 GstFlowReturn ret = GST_FLOW_OK;
4058 gint64 lpos, hpos, newpos;
4059 GstClockTime time, ltime, htime, newtime, dur;
4060 gboolean cont = TRUE;
4061 const GstClockTime tolerance = TARGET_DIFFERENCE;
4062 const guint chunk = 4 * 1024;
4064 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
4065 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
4067 GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
4068 GST_TIME_ARGS (*_time));
4070 /* TODO also make keyframe aware if useful some day */
4085 /* do not know at first */
4087 *_time = GST_CLOCK_TIME_NONE;
4089 /* need initial positions; start and end */
4090 lpos = parse->priv->first_frame_offset;
4091 ltime = parse->priv->first_frame_pts;
4092 /* try other one if no luck */
4093 if (!GST_CLOCK_TIME_IS_VALID (ltime))
4094 ltime = parse->priv->first_frame_dts;
4095 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
4096 GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
4097 return GST_FLOW_ERROR;
4099 hpos = parse->priv->upstream_size;
4101 GST_DEBUG_OBJECT (parse,
4102 "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
4103 ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, hpos,
4104 GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
4106 /* check preconditions are satisfied;
4107 * start and end are needed, except for special case where we scan for
4108 * last frame to determine duration */
4109 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
4110 !GST_CLOCK_TIME_IS_VALID (ltime) ||
4111 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
4115 /* shortcut cases */
4118 } else if (time < ltime + tolerance) {
4122 } else if (time >= htime) {
4128 while (htime > ltime && cont) {
4129 GST_LOG_OBJECT (parse,
4130 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
4131 GST_TIME_ARGS (ltime));
4132 GST_LOG_OBJECT (parse,
4133 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
4134 GST_TIME_ARGS (htime));
4135 if (G_UNLIKELY (time == G_MAXINT64)) {
4137 } else if (G_LIKELY (hpos > lpos)) {
4139 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
4142 /* should mean lpos == hpos, since lpos <= hpos is invariant */
4144 /* we check this case once, but not forever, so break loop */
4149 newpos = CLAMP (newpos, lpos, hpos);
4150 GST_LOG_OBJECT (parse,
4151 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
4152 GST_TIME_ARGS (time), newpos);
4154 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
4155 if (ret == GST_FLOW_EOS) {
4156 /* heuristic HACK */
4157 hpos = MAX (lpos, hpos - chunk);
4159 } else if (ret != GST_FLOW_OK) {
4163 if (newtime == -1 || newpos == -1) {
4164 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
4168 if (G_UNLIKELY (time == G_MAXINT64)) {
4171 if (GST_CLOCK_TIME_IS_VALID (dur))
4174 } else if (newtime > time) {
4176 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
4178 } else if (newtime + tolerance > time) {
4179 /* close enough undershoot */
4183 } else if (newtime < ltime) {
4184 /* so a position beyond lpos resulted in earlier time than ltime ... */
4185 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
4188 /* undershoot too far */
4189 newpos += newpos == lpos ? chunk : 0;
4190 lpos = CLAMP (newpos, lpos, hpos);
4196 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
4197 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
4202 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
4203 gboolean before, GstClockTime * _ts)
4205 gint64 bytes = 0, ts = 0;
4206 GstIndexEntry *entry = NULL;
4208 if (time == GST_CLOCK_TIME_NONE) {
4214 GST_BASE_PARSE_INDEX_LOCK (parse);
4215 if (parse->priv->index) {
4216 /* Let's check if we have an index entry for that time */
4217 entry = gst_index_get_assoc_entry (parse->priv->index,
4218 parse->priv->index_id,
4219 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
4220 GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
4224 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
4225 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
4227 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
4228 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
4229 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
4231 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
4232 GST_TIME_ARGS (time));
4235 ts = GST_CLOCK_TIME_NONE;
4238 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4247 /* returns TRUE if seek succeeded */
4249 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
4254 GstSeekType start_type = GST_SEEK_TYPE_NONE, stop_type;
4255 gboolean flush, update, res = TRUE, accurate;
4256 gint64 start, stop, seekpos, seekstop;
4257 GstSegment seeksegment = { 0, };
4258 GstClockTime start_ts;
4260 GstEvent *segment_event;
4262 /* try upstream first, unless we're driving the streaming thread ourselves */
4263 if (parse->priv->pad_mode != GST_PAD_MODE_PULL) {
4264 res = gst_pad_push_event (parse->sinkpad, gst_event_ref (event));
4269 gst_event_parse_seek (event, &rate, &format, &flags,
4270 &start_type, &start, &stop_type, &stop);
4271 seqnum = gst_event_get_seqnum (event);
4273 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
4274 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
4275 GST_TIME_FORMAT, gst_format_get_name (format), rate,
4276 start_type, GST_TIME_ARGS (start), stop_type, GST_TIME_ARGS (stop));
4278 /* we can only handle TIME, so check if subclass can convert
4279 * to TIME format if it's some other format (such as DEFAULT) */
4280 if (format != GST_FORMAT_TIME) {
4281 if (!gst_base_parse_convert (parse, format, start, GST_FORMAT_TIME, &start)
4282 || !gst_base_parse_convert (parse, format, stop, GST_FORMAT_TIME,
4284 goto no_convert_to_time;
4286 GST_INFO_OBJECT (parse, "converted %s format to start time "
4287 "%" GST_TIME_FORMAT " and stop time %" GST_TIME_FORMAT,
4288 gst_format_get_name (format), GST_TIME_ARGS (start),
4289 GST_TIME_ARGS (stop));
4291 format = GST_FORMAT_TIME;
4294 /* no negative rates in push mode (unless upstream takes care of that, but
4295 * we've already tried upstream and it didn't handle the seek request) */
4296 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
4299 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PULL)
4300 goto negative_rate_pull_mode;
4302 if (start_type != GST_SEEK_TYPE_SET ||
4303 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
4306 /* get flush flag */
4307 flush = flags & GST_SEEK_FLAG_FLUSH;
4309 /* copy segment, we need this because we still need the old
4310 * segment when we close the current segment. */
4311 gst_segment_copy_into (&parse->segment, &seeksegment);
4313 GST_DEBUG_OBJECT (parse, "configuring seek");
4314 gst_segment_do_seek (&seeksegment, rate, format, flags,
4315 start_type, start, stop_type, stop, &update);
4317 /* accurate seeking implies seek tables are used to obtain position,
4318 * and the requested segment is maintained exactly, not adjusted any way */
4319 accurate = flags & GST_SEEK_FLAG_ACCURATE;
4321 /* maybe we can be accurate for (almost) free */
4322 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
4323 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
4324 GST_DEBUG_OBJECT (parse, "accurate seek possible");
4328 GstClockTime startpos = seeksegment.position;
4330 /* accurate requested, so ... seek a bit before target */
4331 if (startpos < parse->priv->lead_in_ts)
4334 startpos -= parse->priv->lead_in_ts;
4335 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
4336 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
4339 start_ts = seeksegment.position;
4340 if (!gst_base_parse_convert (parse, format, seeksegment.position,
4341 GST_FORMAT_BYTES, &seekpos))
4342 goto convert_failed;
4343 if (!gst_base_parse_convert (parse, format, seeksegment.stop,
4344 GST_FORMAT_BYTES, &seekstop))
4345 goto convert_failed;
4348 GST_DEBUG_OBJECT (parse,
4349 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
4351 GST_DEBUG_OBJECT (parse,
4352 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
4353 seeksegment.stop, seekstop);
4355 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
4358 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
4361 if (parse->srcpad) {
4362 GstEvent *fevent = gst_event_new_flush_start ();
4363 GST_DEBUG_OBJECT (parse, "sending flush start");
4365 gst_event_set_seqnum (fevent, seqnum);
4367 gst_pad_push_event (parse->srcpad, gst_event_ref (fevent));
4368 /* unlock upstream pull_range */
4369 gst_pad_push_event (parse->sinkpad, fevent);
4372 gst_pad_pause_task (parse->sinkpad);
4375 /* we should now be able to grab the streaming thread because we stopped it
4376 * with the above flush/pause code */
4377 GST_PAD_STREAM_LOCK (parse->sinkpad);
4379 /* save current position */
4380 last_stop = parse->segment.position;
4381 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
4384 /* now commit to new position */
4386 /* prepare for streaming again */
4388 GstEvent *fevent = gst_event_new_flush_stop (TRUE);
4389 GST_DEBUG_OBJECT (parse, "sending flush stop");
4390 gst_event_set_seqnum (fevent, seqnum);
4391 gst_pad_push_event (parse->srcpad, gst_event_ref (fevent));
4392 gst_pad_push_event (parse->sinkpad, fevent);
4393 gst_base_parse_clear_queues (parse);
4395 /* keep track of our position */
4396 seeksegment.base = gst_segment_to_running_time (&seeksegment,
4397 seeksegment.format, parse->segment.position);
4400 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
4402 /* store the newsegment event so it can be sent from the streaming thread. */
4403 /* This will be sent later in _loop() */
4404 segment_event = gst_event_new_segment (&parse->segment);
4405 gst_event_set_seqnum (segment_event, seqnum);
4406 parse->priv->pending_events =
4407 g_list_prepend (parse->priv->pending_events, segment_event);
4409 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
4410 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
4411 ", time = %" GST_TIME_FORMAT, format,
4412 GST_TIME_ARGS (parse->segment.start),
4413 GST_TIME_ARGS (parse->segment.stop),
4414 GST_TIME_ARGS (parse->segment.time));
4416 /* one last chance in pull mode to stay accurate;
4417 * maybe scan and subclass can find where to go */
4420 GstClockTime ts = seeksegment.position;
4422 gst_base_parse_locate_time (parse, &ts, &scanpos);
4426 /* running collected index now consists of several intervals,
4427 * so optimized check no longer possible */
4428 parse->priv->index_last_valid = FALSE;
4429 parse->priv->index_last_offset = 0;
4430 parse->priv->index_last_ts = 0;
4434 /* mark discont if we are going to stream from another position. */
4435 if (seekpos != parse->priv->offset) {
4436 GST_DEBUG_OBJECT (parse,
4437 "mark DISCONT, we did a seek to another position");
4438 parse->priv->offset = seekpos;
4439 parse->priv->last_offset = seekpos;
4440 parse->priv->seen_keyframe = FALSE;
4441 parse->priv->discont = TRUE;
4442 parse->priv->next_dts = start_ts;
4443 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
4444 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
4445 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
4446 parse->priv->sync_offset = seekpos;
4447 parse->priv->exact_position = accurate;
4450 /* Start streaming thread if paused */
4451 gst_pad_start_task (parse->sinkpad,
4452 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad, NULL);
4454 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
4459 GstEvent *new_event;
4460 GstBaseParseSeek *seek;
4461 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
4463 /* The only thing we need to do in PUSH-mode is to send the
4464 seek event (in bytes) to upstream. Segment / flush handling happens
4465 in corresponding src event handlers */
4466 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
4467 if (seekstop >= 0 && seekstop <= seekpos)
4469 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
4470 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
4471 gst_event_set_seqnum (new_event, seqnum);
4473 /* store segment info so its precise details can be reconstructed when
4474 * receiving newsegment;
4475 * this matters for all details when accurate seeking,
4476 * is most useful to preserve NONE stop time otherwise */
4477 seek = g_new0 (GstBaseParseSeek, 1);
4478 seek->segment = seeksegment;
4479 seek->accurate = accurate;
4480 seek->offset = seekpos;
4481 seek->start_ts = start_ts;
4482 GST_OBJECT_LOCK (parse);
4483 /* less optimal, but preserves order */
4484 parse->priv->pending_seeks =
4485 g_slist_append (parse->priv->pending_seeks, seek);
4486 GST_OBJECT_UNLOCK (parse);
4488 res = gst_pad_push_event (parse->sinkpad, new_event);
4491 GST_OBJECT_LOCK (parse);
4492 parse->priv->pending_seeks =
4493 g_slist_remove (parse->priv->pending_seeks, seek);
4494 GST_OBJECT_UNLOCK (parse);
4500 gst_event_unref (event);
4504 negative_rate_pull_mode:
4506 GST_FIXME_OBJECT (parse, "negative playback in pull mode needs fixing");
4512 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
4518 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
4524 GST_DEBUG_OBJECT (parse, "seek in %s format was requested, but subclass "
4525 "couldn't convert that into TIME format", gst_format_get_name (format));
4531 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
4537 /* Checks if bitrates are available from upstream tags so that we don't
4538 * override them later
4541 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
4543 GstTagList *taglist = NULL;
4546 gst_event_parse_tag (event, &taglist);
4548 /* We only care about stream tags here */
4549 if (gst_tag_list_get_scope (taglist) != GST_TAG_SCOPE_STREAM)
4552 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
4553 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
4554 parse->priv->post_min_bitrate = FALSE;
4556 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
4557 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
4558 parse->priv->post_avg_bitrate = FALSE;
4560 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
4561 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
4562 parse->priv->post_max_bitrate = FALSE;
4568 gst_base_parse_set_index (GstElement * element, GstIndex * index)
4570 GstBaseParse *parse = GST_BASE_PARSE (element);
4572 GST_BASE_PARSE_INDEX_LOCK (parse);
4573 if (parse->priv->index)
4574 gst_object_unref (parse->priv->index);
4576 parse->priv->index = gst_object_ref (index);
4577 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4578 &parse->priv->index_id);
4579 parse->priv->own_index = FALSE;
4581 parse->priv->index = NULL;
4583 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4587 gst_base_parse_get_index (GstElement * element)
4589 GstBaseParse *parse = GST_BASE_PARSE (element);
4590 GstIndex *result = NULL;
4592 GST_BASE_PARSE_INDEX_LOCK (parse);
4593 if (parse->priv->index)
4594 result = gst_object_ref (parse->priv->index);
4595 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4601 static GstStateChangeReturn
4602 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4604 GstBaseParse *parse;
4605 GstStateChangeReturn result;
4607 parse = GST_BASE_PARSE (element);
4609 switch (transition) {
4610 case GST_STATE_CHANGE_READY_TO_PAUSED:
4611 /* If this is our own index destroy it as the
4612 * old entries might be wrong for the new stream */
4613 GST_BASE_PARSE_INDEX_LOCK (parse);
4614 if (parse->priv->own_index) {
4615 gst_object_unref (parse->priv->index);
4616 parse->priv->index = NULL;
4617 parse->priv->own_index = FALSE;
4620 /* If no index was created, generate one */
4621 if (G_UNLIKELY (!parse->priv->index)) {
4622 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4624 parse->priv->index = g_object_new (gst_mem_index_get_type (), NULL);
4625 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4626 &parse->priv->index_id);
4627 parse->priv->own_index = TRUE;
4629 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4635 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4637 switch (transition) {
4638 case GST_STATE_CHANGE_PAUSED_TO_READY:
4639 gst_base_parse_reset (parse);
4649 * gst_base_parse_set_ts_at_offset:
4650 * @parse: a #GstBaseParse
4651 * @offset: offset into current buffer
4653 * This function should only be called from a @handle_frame implementation.
4655 * #GstBaseParse creates initial timestamps for frames by using the last
4656 * timestamp seen in the stream before the frame starts. In certain
4657 * cases, the correct timestamps will occur in the stream after the
4658 * start of the frame, but before the start of the actual picture data.
4659 * This function can be used to set the timestamps based on the offset
4660 * into the frame data that the picture starts.
4665 gst_base_parse_set_ts_at_offset (GstBaseParse * parse, gsize offset)
4667 GstClockTime pts, dts;
4669 g_return_if_fail (GST_IS_BASE_PARSE (parse));
4671 pts = gst_adapter_prev_pts_at_offset (parse->priv->adapter, offset, NULL);
4672 dts = gst_adapter_prev_dts_at_offset (parse->priv->adapter, offset, NULL);
4674 if (!GST_CLOCK_TIME_IS_VALID (pts) || !GST_CLOCK_TIME_IS_VALID (dts)) {
4675 GST_DEBUG_OBJECT (parse,
4676 "offset adapter timestamps dts=%" GST_TIME_FORMAT " pts=%"
4677 GST_TIME_FORMAT, GST_TIME_ARGS (dts), GST_TIME_ARGS (pts));
4679 if (GST_CLOCK_TIME_IS_VALID (pts) && (parse->priv->prev_pts != pts))
4680 parse->priv->prev_pts = parse->priv->next_pts = pts;
4682 if (GST_CLOCK_TIME_IS_VALID (dts) && (parse->priv->prev_dts != dts))
4683 parse->priv->prev_dts = parse->priv->next_dts = dts;