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., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, 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 (NEWSEGMENT/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 class calls @set_sink_caps to inform the subclass about
54 * incoming sinkpad caps. Subclass should set the srcpad caps accordingly.
57 * GstBaseParse calls @start to inform subclass that data processing is
61 * At least at this point subclass needs to tell the GstBaseParse class
62 * how big data chunks it wants to receive (min_frame_size). It can do
63 * this with gst_base_parse_set_min_frame_size().
66 * GstBaseParse class sets up appropriate data passing mode (pull/push)
67 * and starts to process the data.
73 * <title>Parsing phase</title>
75 * GstBaseParse gathers at least min_frame_size bytes of data either
76 * by pulling it from upstream or collecting buffers in an internal
80 * A buffer of (at least) min_frame_size bytes is passed to subclass with
81 * @check_valid_frame. Subclass checks the contents and returns TRUE
82 * if the buffer contains a valid frame. It also needs to set the
83 * @framesize according to the detected frame size. If buffer didn't
84 * contain a valid frame, this call must return FALSE and optionally
85 * set the @skipsize value to inform base class that how many bytes
86 * it needs to skip in order to find a valid frame. @framesize can always
87 * indicate a new minimum for current frame parsing. Indicating G_MAXUINT
88 * for requested amount means subclass simply needs best available
89 * subsequent data. In push mode this amounts to an additional input buffer
90 * (thus minimal additional latency), in pull mode this amounts to some
91 * arbitrary reasonable buffer size increase. The passed buffer
92 * is read-only. Note that @check_valid_frame might receive any small
93 * amount of input data when leftover data is being drained (e.g. at EOS).
96 * After valid frame is found, it will be passed again to subclass with
97 * @parse_frame call. Now subclass is responsible for parsing the
98 * frame contents and setting the caps, and buffer metadata (e.g.
99 * buffer timestamp and duration, or keyframe if applicable).
100 * (although the latter can also be done by GstBaseParse if it is
101 * appropriately configured, see below). Frame is provided with
102 * timestamp derived from upstream (as much as generally possible),
103 * duration obtained from configuration (see below), and offset
104 * if meaningful (in pull mode).
107 * Finally the buffer can be pushed downstream and the parsing loop starts
108 * over again. Just prior to actually pushing the buffer in question,
109 * it is passed to @pre_push_frame which gives subclass yet one
110 * last chance to examine buffer metadata, or to send some custom (tag)
111 * events, or to perform custom (segment) filtering.
114 * During the parsing process GstBaseParseClass will handle both srcpad
115 * and sinkpad events. They will be passed to subclass if @event or
116 * @src_event callbacks have been provided.
121 * <itemizedlist><title>Shutdown phase</title>
123 * GstBaseParse class calls @stop to inform the subclass that data
124 * parsing will be stopped.
130 * Subclass is responsible for providing pad template caps for
131 * source and sink pads. The pads need to be named "sink" and "src". It also
132 * needs to set the fixed caps on srcpad, when the format is ensured (e.g.
133 * when base class calls subclass' @set_sink_caps function).
135 * This base class uses #GST_FORMAT_DEFAULT as a meaning of frames. So,
136 * subclass conversion routine needs to know that conversion from
137 * #GST_FORMAT_TIME to #GST_FORMAT_DEFAULT must return the
138 * frame number that can be found from the given byte position.
140 * GstBaseParse uses subclasses conversion methods also for seeking (or
141 * otherwise uses its own default one, see also below).
143 * Subclass @start and @stop functions will be called to inform the beginning
144 * and end of data processing.
146 * Things that subclass need to take care of:
148 * <listitem><para>Provide pad templates</para></listitem>
150 * Fixate the source pad caps when appropriate
153 * Inform base class how big data chunks should be retrieved. This is
154 * done with gst_base_parse_set_min_frame_size() function.
157 * Examine data chunks passed to subclass with @check_valid_frame
158 * and tell if they contain a valid frame
161 * Set the caps and timestamp to frame that is passed to subclass with
162 * @parse_frame function.
164 * <listitem><para>Provide conversion functions</para></listitem>
166 * Update the duration information with gst_base_parse_set_duration()
169 * Optionally passthrough using gst_base_parse_set_passthrough()
172 * Configure various baseparse parameters using
173 * gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
174 * and gst_base_parse_set_frame_rate().
177 * In particular, if subclass is unable to determine a duration, but
178 * parsing (or specs) yields a frames per seconds rate, then this can be
179 * provided to GstBaseParse to enable it to cater for
180 * buffer time metadata (which will be taken from upstream as much as
181 * possible). Internally keeping track of frame durations and respective
182 * sizes that have been pushed provides GstBaseParse with an estimated
183 * bitrate. A default @convert (used if not overriden) will then use these
184 * rates to perform obvious conversions. These rates are also used to
185 * update (estimated) duration at regular frame intervals.
192 * - In push mode provide a queue of adapter-"queued" buffers for upstream
194 * - Queue buffers/events until caps are set
204 #include <gst/base/gstadapter.h>
206 #include "gstbaseparse.h"
208 /* FIXME: get rid of old GstIndex code */
209 #include "gstindex.h"
210 #include "gstindex.c"
211 #include "gstmemindex.c"
213 #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
215 #define MIN_FRAMES_TO_POST_BITRATE 10
216 #define TARGET_DIFFERENCE (20 * GST_SECOND)
218 GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
219 #define GST_CAT_DEFAULT gst_base_parse_debug
221 /* Supported formats */
222 static const GstFormat fmtlist[] = {
229 #define GST_BASE_PARSE_GET_PRIVATE(obj) \
230 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
232 struct _GstBaseParsePrivate
239 GstFormat duration_fmt;
240 gint64 estimated_duration;
241 gint64 estimated_drift;
243 guint min_frame_size;
244 gboolean passthrough;
246 gboolean has_timing_info;
247 guint fps_num, fps_den;
248 gint update_interval;
250 guint lead_in, lead_out;
251 GstClockTime lead_in_ts, lead_out_ts;
252 GstClockTime min_latency, max_latency;
260 GstClockTime next_ts;
261 GstClockTime prev_ts;
262 GstClockTime frame_duration;
263 gboolean seen_keyframe;
268 guint64 data_bytecount;
269 guint64 acc_duration;
270 GstClockTime first_frame_ts;
271 gint64 first_frame_offset;
273 gboolean post_min_bitrate;
274 gboolean post_avg_bitrate;
275 gboolean post_max_bitrate;
279 guint posted_avg_bitrate;
281 GList *pending_events;
283 /* frames/buffers that are queued and ready to go on OK */
284 GQueue queued_frames;
288 /* index entry storage, either ours or provided */
294 /* seek table entries only maintained if upstream is BYTE seekable */
295 gboolean upstream_seekable;
296 gboolean upstream_has_duration;
297 gint64 upstream_size;
298 /* minimum distance between two index entries */
299 GstClockTimeDiff idx_interval;
300 /* ts and offset of last entry added */
301 GstClockTime index_last_ts;
302 gint64 index_last_offset;
303 gboolean index_last_valid;
305 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
306 gboolean exact_position;
307 /* seek events are temporarily kept to match them with newsegments */
308 GSList *pending_seeks;
310 /* reverse playback */
311 GSList *buffers_pending;
312 GSList *buffers_queued;
313 GSList *buffers_send;
314 GstClockTime last_ts;
317 /* Newsegment event to be sent after SEEK */
318 GstEvent *pending_segment;
320 /* Segment event that closes the running segment prior to SEEK */
321 GstEvent *close_segment;
323 /* push mode helper frame */
324 GstBaseParseFrame frame;
326 /* TRUE if we're still detecting the format, i.e.
327 * if ::detect() is still called for future buffers */
329 GList *detect_buffers;
330 guint detect_buffers_size;
333 typedef struct _GstBaseParseSeek
338 GstClockTime start_ts;
341 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
342 g_mutex_lock (&parse->priv->index_lock);
343 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
344 g_mutex_unlock (&parse->priv->index_lock);
346 static GstElementClass *parent_class = NULL;
348 static void gst_base_parse_class_init (GstBaseParseClass * klass);
349 static void gst_base_parse_init (GstBaseParse * parse,
350 GstBaseParseClass * klass);
353 gst_base_parse_get_type (void)
355 static volatile gsize base_parse_type = 0;
357 if (g_once_init_enter (&base_parse_type)) {
358 static const GTypeInfo base_parse_info = {
359 sizeof (GstBaseParseClass),
360 (GBaseInitFunc) NULL,
361 (GBaseFinalizeFunc) NULL,
362 (GClassInitFunc) gst_base_parse_class_init,
365 sizeof (GstBaseParse),
367 (GInstanceInitFunc) gst_base_parse_init,
371 _type = g_type_register_static (GST_TYPE_ELEMENT,
372 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
373 g_once_init_leave (&base_parse_type, _type);
375 return (GType) base_parse_type;
378 static void gst_base_parse_finalize (GObject * object);
380 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
381 GstStateChange transition);
382 static void gst_base_parse_reset (GstBaseParse * parse);
385 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
386 static GstIndex *gst_base_parse_get_index (GstElement * element);
389 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
391 static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
392 GstObject * parent, GstPadMode mode, gboolean active);
393 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
395 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
397 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
399 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
402 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
404 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
407 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
409 static void gst_base_parse_loop (GstPad * pad);
411 static gboolean gst_base_parse_check_frame (GstBaseParse * parse,
412 GstBaseParseFrame * frame, guint * framesize, gint * skipsize);
413 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
414 GstBaseParseFrame * frame);
416 static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse,
419 static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse,
422 static void gst_base_parse_drain (GstBaseParse * parse);
424 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
425 gboolean post_min, gboolean post_avg, gboolean post_max);
427 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
428 GstClockTime time, gboolean before, GstClockTime * _ts);
429 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
430 GstClockTime * _time, gint64 * _offset);
432 static GstFlowReturn gst_base_parse_process_fragment (GstBaseParse * parse,
435 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
438 gst_base_parse_clear_queues (GstBaseParse * parse)
440 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
441 g_slist_free (parse->priv->buffers_queued);
442 parse->priv->buffers_queued = NULL;
443 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
445 g_slist_free (parse->priv->buffers_pending);
446 parse->priv->buffers_pending = NULL;
447 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
448 g_slist_free (parse->priv->buffers_send);
449 parse->priv->buffers_send = NULL;
451 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
452 g_list_free (parse->priv->detect_buffers);
453 parse->priv->detect_buffers = NULL;
454 parse->priv->detect_buffers_size = 0;
456 g_queue_foreach (&parse->priv->queued_frames,
457 (GFunc) gst_base_parse_frame_free, NULL);
458 g_queue_clear (&parse->priv->queued_frames);
462 gst_base_parse_finalize (GObject * object)
464 GstBaseParse *parse = GST_BASE_PARSE (object);
467 g_object_unref (parse->priv->adapter);
469 if (parse->priv->pending_segment) {
470 p_ev = &parse->priv->pending_segment;
471 gst_event_replace (p_ev, NULL);
473 if (parse->priv->close_segment) {
474 p_ev = &parse->priv->close_segment;
475 gst_event_replace (p_ev, NULL);
478 if (parse->priv->cache) {
479 gst_buffer_unref (parse->priv->cache);
480 parse->priv->cache = NULL;
483 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
485 g_list_free (parse->priv->pending_events);
486 parse->priv->pending_events = NULL;
488 if (parse->priv->index) {
489 gst_object_unref (parse->priv->index);
490 parse->priv->index = NULL;
492 g_mutex_clear (&parse->priv->index_lock);
494 gst_base_parse_clear_queues (parse);
496 G_OBJECT_CLASS (parent_class)->finalize (object);
500 gst_base_parse_class_init (GstBaseParseClass * klass)
502 GObjectClass *gobject_class;
503 GstElementClass *gstelement_class;
505 gobject_class = G_OBJECT_CLASS (klass);
506 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
507 parent_class = g_type_class_peek_parent (klass);
508 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
510 gstelement_class = (GstElementClass *) klass;
511 gstelement_class->change_state =
512 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
515 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
516 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
519 /* Default handlers */
520 klass->check_valid_frame = gst_base_parse_check_frame;
521 klass->parse_frame = gst_base_parse_parse_frame;
522 klass->src_event = gst_base_parse_src_eventfunc;
523 klass->convert = gst_base_parse_convert_default;
525 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
526 "baseparse element");
530 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
532 GstPadTemplate *pad_template;
534 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
536 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
539 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
540 g_return_if_fail (pad_template != NULL);
541 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
542 gst_pad_set_event_function (parse->sinkpad,
543 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
544 gst_pad_set_query_function (parse->sinkpad,
545 GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
546 gst_pad_set_chain_function (parse->sinkpad,
547 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
548 gst_pad_set_activate_function (parse->sinkpad,
549 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
550 gst_pad_set_activatemode_function (parse->sinkpad,
551 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
552 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
554 GST_DEBUG_OBJECT (parse, "sinkpad created");
557 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
558 g_return_if_fail (pad_template != NULL);
559 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
560 gst_pad_set_event_function (parse->srcpad,
561 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
562 gst_pad_set_query_function (parse->srcpad,
563 GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
564 gst_pad_use_fixed_caps (parse->srcpad);
565 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
566 GST_DEBUG_OBJECT (parse, "src created");
568 g_queue_init (&parse->priv->queued_frames);
570 parse->priv->adapter = gst_adapter_new ();
572 parse->priv->pad_mode = GST_PAD_MODE_NONE;
574 g_mutex_init (&parse->priv->index_lock);
577 gst_base_parse_reset (parse);
578 GST_DEBUG_OBJECT (parse, "init ok");
580 GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE);
583 static GstBaseParseFrame *
584 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
586 GstBaseParseFrame *copy;
588 copy = g_slice_dup (GstBaseParseFrame, frame);
589 copy->buffer = gst_buffer_ref (frame->buffer);
590 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
592 GST_TRACE ("copied frame %p -> %p", frame, copy);
598 gst_base_parse_frame_free (GstBaseParseFrame * frame)
600 GST_TRACE ("freeing frame %p", frame);
603 gst_buffer_unref (frame->buffer);
604 frame->buffer = NULL;
607 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
608 g_slice_free (GstBaseParseFrame, frame);
610 memset (frame, 0, sizeof (*frame));
614 G_DEFINE_BOXED_TYPE (GstBaseParseFrame, gst_base_parse_frame,
615 (GBoxedCopyFunc) gst_base_parse_frame_copy,
616 (GBoxedFreeFunc) gst_base_parse_frame_free);
619 * gst_base_parse_frame_init:
620 * @frame: #GstBaseParseFrame.
622 * Sets a #GstBaseParseFrame to initial state. Currently this means
623 * all public fields are zero-ed and a private flag is set to make
624 * sure gst_base_parse_frame_free() only frees the contents but not
625 * the actual frame. Use this function to initialise a #GstBaseParseFrame
626 * allocated on the stack.
631 gst_base_parse_frame_init (GstBaseParseFrame * frame)
633 memset (frame, 0, sizeof (GstBaseParseFrame));
634 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
635 GST_TRACE ("inited frame %p", frame);
639 * gst_base_parse_frame_new:
640 * @buffer: (transfer none): a #GstBuffer
642 * @overhead: number of bytes in this frame which should be counted as
643 * metadata overhead, ie. not used to calculate the average bitrate.
644 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
646 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
647 * elements written in C should usually allocate the frame on the stack and
648 * then use gst_base_parse_frame_init() to initialise it.
650 * Returns: a newly-allocated #GstBaseParseFrame. Free with
651 * gst_base_parse_frame_free() when no longer needed, unless you gave
652 * away ownership to gst_base_parse_push_frame().
657 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
660 GstBaseParseFrame *frame;
662 frame = g_slice_new0 (GstBaseParseFrame);
663 frame->buffer = gst_buffer_ref (buffer);
665 GST_TRACE ("created frame %p", frame);
670 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
673 gst_buffer_replace (&frame->buffer, buf);
677 /* set flags one by one for clarity */
678 if (G_UNLIKELY (parse->priv->drain))
679 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
681 /* losing sync is pretty much a discont (and vice versa), no ? */
682 if (G_UNLIKELY (parse->priv->discont))
683 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
687 gst_base_parse_reset (GstBaseParse * parse)
689 GST_OBJECT_LOCK (parse);
690 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
691 parse->priv->duration = -1;
692 parse->priv->min_frame_size = 1;
693 parse->priv->discont = TRUE;
694 parse->priv->flushing = FALSE;
695 parse->priv->offset = 0;
696 parse->priv->sync_offset = 0;
697 parse->priv->update_interval = -1;
698 parse->priv->fps_num = parse->priv->fps_den = 0;
699 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
700 parse->priv->lead_in = parse->priv->lead_out = 0;
701 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
702 parse->priv->bitrate = 0;
703 parse->priv->framecount = 0;
704 parse->priv->bytecount = 0;
705 parse->priv->acc_duration = 0;
706 parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE;
707 parse->priv->first_frame_offset = -1;
708 parse->priv->estimated_duration = -1;
709 parse->priv->estimated_drift = 0;
710 parse->priv->next_ts = 0;
711 parse->priv->syncable = TRUE;
712 parse->priv->passthrough = FALSE;
713 parse->priv->has_timing_info = FALSE;
714 parse->priv->post_min_bitrate = TRUE;
715 parse->priv->post_avg_bitrate = TRUE;
716 parse->priv->post_max_bitrate = TRUE;
717 parse->priv->min_bitrate = G_MAXUINT;
718 parse->priv->max_bitrate = 0;
719 parse->priv->avg_bitrate = 0;
720 parse->priv->posted_avg_bitrate = 0;
722 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
723 parse->priv->index_last_offset = -1;
724 parse->priv->index_last_valid = TRUE;
725 parse->priv->upstream_seekable = FALSE;
726 parse->priv->upstream_size = 0;
727 parse->priv->upstream_has_duration = FALSE;
728 parse->priv->idx_interval = 0;
729 parse->priv->exact_position = TRUE;
730 parse->priv->seen_keyframe = FALSE;
732 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
733 parse->priv->last_offset = 0;
735 if (parse->priv->pending_segment) {
736 gst_event_unref (parse->priv->pending_segment);
737 parse->priv->pending_segment = NULL;
740 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
742 g_list_free (parse->priv->pending_events);
743 parse->priv->pending_events = NULL;
745 if (parse->priv->cache) {
746 gst_buffer_unref (parse->priv->cache);
747 parse->priv->cache = NULL;
750 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
751 g_slist_free (parse->priv->pending_seeks);
752 parse->priv->pending_seeks = NULL;
754 if (parse->priv->adapter)
755 gst_adapter_clear (parse->priv->adapter);
757 /* we know it is not alloc'ed, but maybe other stuff to free, some day ... */
758 parse->priv->frame._private_flags |=
759 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
760 gst_base_parse_frame_free (&parse->priv->frame);
762 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
763 g_list_free (parse->priv->detect_buffers);
764 parse->priv->detect_buffers = NULL;
765 parse->priv->detect_buffers_size = 0;
766 GST_OBJECT_UNLOCK (parse);
769 /* gst_base_parse_check_frame:
770 * @parse: #GstBaseParse.
771 * @buffer: GstBuffer.
772 * @framesize: This will be set to tell the found frame size in bytes.
773 * @skipsize: Output parameter that tells how much data needs to be skipped
774 * in order to find the following frame header.
776 * Default callback for check_valid_frame.
778 * Returns: Always TRUE.
781 gst_base_parse_check_frame (GstBaseParse * parse,
782 GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
784 *framesize = gst_buffer_get_size (frame->buffer);
790 /* gst_base_parse_parse_frame:
791 * @parse: #GstBaseParse.
792 * @buffer: #GstBuffer.
794 * Default callback for parse_frame.
797 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
799 GstBuffer *buffer = frame->buffer;
801 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
802 GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) {
803 GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts;
805 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
806 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
807 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
812 /* gst_base_parse_convert:
813 * @parse: #GstBaseParse.
814 * @src_format: #GstFormat describing the source format.
815 * @src_value: Source value to be converted.
816 * @dest_format: #GstFormat defining the converted format.
817 * @dest_value: Pointer where the conversion result will be put.
819 * Converts using configured "convert" vmethod in #GstBaseParse class.
821 * Returns: TRUE if conversion was successful.
824 gst_base_parse_convert (GstBaseParse * parse,
825 GstFormat src_format,
826 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
828 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
831 g_return_val_if_fail (dest_value != NULL, FALSE);
836 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
838 #ifndef GST_DISABLE_GST_DEBUG
841 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
842 GST_LOG_OBJECT (parse,
843 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
844 GST_TIME_ARGS (src_value), *dest_value);
845 } else if (dest_format == GST_FORMAT_TIME &&
846 src_format == GST_FORMAT_BYTES) {
847 GST_LOG_OBJECT (parse,
848 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
849 src_value, GST_TIME_ARGS (*dest_value));
851 GST_LOG_OBJECT (parse,
852 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
853 GST_STR_NULL (gst_format_get_name (src_format)),
854 GST_STR_NULL (gst_format_get_name (dest_format)),
855 src_value, *dest_value);
858 GST_DEBUG_OBJECT (parse, "conversion failed");
866 /* gst_base_parse_sink_event:
867 * @pad: #GstPad that received the event.
868 * @event: #GstEvent to be handled.
870 * Handler for sink pad events.
872 * Returns: TRUE if the event was handled.
875 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
878 GstBaseParseClass *bclass;
879 gboolean handled = FALSE;
882 parse = GST_BASE_PARSE (parent);
883 bclass = GST_BASE_PARSE_GET_CLASS (parse);
885 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
886 GST_EVENT_TYPE_NAME (event));
888 /* Cache all events except EOS, SEGMENT and FLUSH_STOP if we have a
890 if (parse->priv->pending_segment && GST_EVENT_TYPE (event) != GST_EVENT_EOS
891 && GST_EVENT_TYPE (event) != GST_EVENT_SEGMENT
892 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
893 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP
894 && GST_EVENT_TYPE (event) != GST_EVENT_CAPS) {
896 if (GST_EVENT_TYPE (event) == GST_EVENT_TAG)
897 /* See if any bitrate tags were posted */
898 gst_base_parse_handle_tag (parse, event);
900 parse->priv->pending_events =
901 g_list_append (parse->priv->pending_events, event);
905 if (GST_EVENT_TYPE (event) == GST_EVENT_EOS &&
906 parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
907 /* We've not posted bitrate tags yet - do so now */
908 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
911 handled = bclass->event (parse, event);
914 handled = gst_base_parse_sink_eventfunc (parse, event);
917 ret = gst_pad_event_default (pad, parent, event);
920 GST_DEBUG_OBJECT (parse, "event handled");
926 /* gst_base_parse_sink_eventfunc:
927 * @parse: #GstBaseParse.
928 * @event: #GstEvent to be handled.
930 * Element-level event handler function.
932 * The event will be unreffed only if it has been handled and this
933 * function returns %TRUE
935 * Returns: %TRUE if the event was handled and not need forwarding.
938 gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event)
940 gboolean handled = FALSE;
943 switch (GST_EVENT_TYPE (event)) {
947 GstBaseParseClass *klass;
949 klass = GST_BASE_PARSE_GET_CLASS (parse);
951 gst_event_parse_caps (event, &caps);
952 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
954 if (klass->set_sink_caps)
955 klass->set_sink_caps (parse, caps);
957 /* will send our own caps downstream */
958 gst_event_unref (event);
962 case GST_EVENT_SEGMENT:
964 const GstSegment *in_segment;
965 GstSegment out_segment;
966 gint64 offset = 0, next_ts;
969 gdouble rate, applied_rate;
971 gint64 start, stop, pos, next_ts;
975 gst_event_parse_segment (event, &in_segment);
976 gst_segment_init (&out_segment, GST_FORMAT_TIME);
978 GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
980 if (in_segment->format == GST_FORMAT_BYTES) {
981 GstBaseParseSeek *seek = NULL;
984 /* stop time is allowed to be open-ended, but not start & pos */
985 offset = in_segment->time;
987 GST_OBJECT_LOCK (parse);
988 for (node = parse->priv->pending_seeks; node; node = node->next) {
989 GstBaseParseSeek *tmp = node->data;
991 if (tmp->offset == offset) {
996 parse->priv->pending_seeks =
997 g_slist_remove (parse->priv->pending_seeks, seek);
998 GST_OBJECT_UNLOCK (parse);
1001 GST_DEBUG_OBJECT (parse,
1002 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
1003 seek->accurate ? " accurate" : "", &seek->segment);
1005 out_segment.start = seek->segment.start;
1006 out_segment.stop = seek->segment.stop;
1007 out_segment.time = seek->segment.start;
1009 next_ts = seek->start_ts;
1010 parse->priv->exact_position = seek->accurate;
1013 /* best attempt convert */
1014 /* as these are only estimates, stop is kept open-ended to avoid
1015 * premature cutting */
1016 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
1017 GST_FORMAT_TIME, (gint64 *) & next_ts);
1019 out_segment.start = next_ts;
1020 out_segment.stop = GST_CLOCK_TIME_NONE;
1021 out_segment.time = next_ts;
1023 parse->priv->exact_position = (in_segment->start == 0);
1026 gst_event_unref (event);
1028 event = gst_event_new_segment (&out_segment);
1030 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1031 GST_SEGMENT_FORMAT, in_segment);
1033 } else if (in_segment->format != GST_FORMAT_TIME) {
1034 /* Unknown incoming segment format. Output a default open-ended
1036 gst_event_unref (event);
1038 out_segment.start = 0;
1039 out_segment.stop = GST_CLOCK_TIME_NONE;;
1040 out_segment.time = 0;;
1042 event = gst_event_new_segment (&out_segment);
1046 /* not considered BYTE seekable if it is talking to us in TIME,
1047 * whatever else it might claim */
1048 parse->priv->upstream_seekable = FALSE;
1049 next_ts = in_segment->start;
1052 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1055 gst_segment_set_newsegment (&parse->segment, update, rate,
1056 applied_rate, format, start, stop, start);
1059 /* save the segment for later, right before we push a new buffer so that
1060 * the caps are fixed and the next linked element can receive
1062 eventp = &parse->priv->pending_segment;
1063 gst_event_replace (eventp, event);
1064 gst_event_unref (event);
1067 /* but finish the current segment */
1068 GST_DEBUG_OBJECT (parse, "draining current segment");
1069 if (in_segment->rate > 0.0)
1070 gst_base_parse_drain (parse);
1072 gst_base_parse_process_fragment (parse, FALSE);
1073 gst_adapter_clear (parse->priv->adapter);
1075 parse->priv->offset = offset;
1076 parse->priv->sync_offset = offset;
1077 parse->priv->next_ts = next_ts;
1078 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1079 parse->priv->discont = TRUE;
1080 parse->priv->seen_keyframe = FALSE;
1084 case GST_EVENT_FLUSH_START:
1085 parse->priv->flushing = TRUE;
1086 handled = gst_pad_push_event (parse->srcpad, gst_event_ref (event));
1088 gst_event_unref (event);
1089 /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
1090 GST_PAD_STREAM_LOCK (parse->srcpad);
1091 GST_PAD_STREAM_UNLOCK (parse->srcpad);
1095 case GST_EVENT_FLUSH_STOP:
1096 gst_adapter_clear (parse->priv->adapter);
1097 gst_base_parse_clear_queues (parse);
1098 parse->priv->flushing = FALSE;
1099 parse->priv->discont = TRUE;
1100 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1101 parse->priv->frame._private_flags |=
1102 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
1103 gst_base_parse_frame_free (&parse->priv->frame);
1107 if (parse->segment.rate > 0.0)
1108 gst_base_parse_drain (parse);
1110 gst_base_parse_process_fragment (parse, FALSE);
1112 /* If we STILL have zero frames processed, fire an error */
1113 if (parse->priv->framecount == 0) {
1114 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1115 ("No valid frames found before end of stream"), (NULL));
1117 /* newsegment before eos */
1118 if (parse->priv->pending_segment) {
1119 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
1120 parse->priv->pending_segment = NULL;
1132 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1134 GstBaseParse *parse;
1135 GstBaseParseClass *bclass;
1138 parse = GST_BASE_PARSE (parent);
1139 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1141 switch (GST_QUERY_TYPE (query)) {
1142 case GST_QUERY_CAPS:
1144 if (bclass->get_sink_caps) {
1145 GstCaps *caps, *filter;
1147 gst_query_parse_caps (query, &filter);
1148 caps = bclass->get_sink_caps (parse, filter);
1149 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1151 gst_query_set_caps_result (query, caps);
1152 gst_caps_unref (caps);
1156 GstCaps *caps, *template_caps, *filter;
1158 gst_query_parse_caps (query, &filter);
1159 template_caps = gst_pad_get_pad_template_caps (pad);
1160 if (filter != NULL) {
1162 gst_caps_intersect_full (filter, template_caps,
1163 GST_CAPS_INTERSECT_FIRST);
1164 gst_caps_unref (template_caps);
1166 caps = template_caps;
1168 gst_query_set_caps_result (query, caps);
1169 gst_caps_unref (caps);
1177 res = gst_pad_query_default (pad, parent, query);
1186 /* gst_base_parse_src_event:
1187 * @pad: #GstPad that received the event.
1188 * @event: #GstEvent that was received.
1190 * Handler for source pad events.
1192 * Returns: TRUE if the event was handled.
1195 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1197 GstBaseParse *parse;
1198 GstBaseParseClass *bclass;
1199 gboolean handled = FALSE;
1200 gboolean ret = TRUE;
1202 parse = GST_BASE_PARSE (parent);
1203 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1205 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1206 GST_EVENT_TYPE_NAME (event));
1208 if (bclass->src_event)
1209 handled = bclass->src_event (parse, event);
1212 ret = gst_pad_event_default (pad, parent, event);
1218 gst_base_parse_is_seekable (GstBaseParse * parse)
1220 /* FIXME: could do more here, e.g. check index or just send data from 0
1221 * in pull mode and let decoder/sink clip */
1222 return parse->priv->syncable;
1225 /* gst_base_parse_src_eventfunc:
1226 * @parse: #GstBaseParse.
1227 * @event: #GstEvent that was received.
1229 * Default srcpad event handler.
1231 * Returns: TRUE if the event was handled and can be dropped.
1234 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1236 gboolean handled = FALSE;
1238 switch (GST_EVENT_TYPE (event)) {
1239 case GST_EVENT_SEEK:
1241 if (gst_base_parse_is_seekable (parse)) {
1242 handled = gst_base_parse_handle_seek (parse, event);
1254 * gst_base_parse_convert_default:
1255 * @parse: #GstBaseParse.
1256 * @src_format: #GstFormat describing the source format.
1257 * @src_value: Source value to be converted.
1258 * @dest_format: #GstFormat defining the converted format.
1259 * @dest_value: Pointer where the conversion result will be put.
1261 * Default implementation of "convert" vmethod in #GstBaseParse class.
1263 * Returns: TRUE if conversion was successful.
1268 gst_base_parse_convert_default (GstBaseParse * parse,
1269 GstFormat src_format,
1270 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1272 gboolean ret = FALSE;
1273 guint64 bytes, duration;
1275 if (G_UNLIKELY (src_format == dest_format)) {
1276 *dest_value = src_value;
1280 if (G_UNLIKELY (src_value == -1)) {
1285 if (G_UNLIKELY (src_value == 0)) {
1290 /* need at least some frames */
1291 if (!parse->priv->framecount)
1294 duration = parse->priv->acc_duration / GST_MSECOND;
1295 bytes = parse->priv->bytecount;
1297 if (G_UNLIKELY (!duration || !bytes))
1300 if (src_format == GST_FORMAT_BYTES) {
1301 if (dest_format == GST_FORMAT_TIME) {
1302 /* BYTES -> TIME conversion */
1303 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1304 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1305 *dest_value *= GST_MSECOND;
1306 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1307 *dest_value / GST_MSECOND);
1310 } else if (src_format == GST_FORMAT_TIME) {
1311 if (dest_format == GST_FORMAT_BYTES) {
1312 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1313 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1315 GST_DEBUG_OBJECT (parse,
1316 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1317 src_value / GST_MSECOND, *dest_value);
1320 } else if (src_format == GST_FORMAT_DEFAULT) {
1321 /* DEFAULT == frame-based */
1322 if (dest_format == GST_FORMAT_TIME) {
1323 if (parse->priv->fps_den) {
1324 *dest_value = gst_util_uint64_scale (src_value,
1325 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1328 } else if (dest_format == GST_FORMAT_BYTES) {
1336 gst_base_parse_update_duration (GstBaseParse * baseparse)
1339 GstBaseParse *parse;
1341 parse = GST_BASE_PARSE (baseparse);
1343 peer = gst_pad_get_peer (parse->sinkpad);
1345 gboolean qres = FALSE;
1346 gint64 ptot, dest_value;
1348 qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot);
1349 gst_object_unref (GST_OBJECT (peer));
1351 if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1352 GST_FORMAT_TIME, &dest_value)) {
1354 /* inform if duration changed, but try to avoid spamming */
1355 parse->priv->estimated_drift +=
1356 dest_value - parse->priv->estimated_duration;
1357 if (parse->priv->estimated_drift > GST_SECOND ||
1358 parse->priv->estimated_drift < -GST_SECOND) {
1359 gst_element_post_message (GST_ELEMENT (parse),
1360 gst_message_new_duration (GST_OBJECT (parse),
1361 GST_FORMAT_TIME, dest_value));
1362 parse->priv->estimated_drift = 0;
1364 parse->priv->estimated_duration = dest_value;
1365 GST_LOG_OBJECT (parse,
1366 "updated estimated duration to %" GST_TIME_FORMAT,
1367 GST_TIME_ARGS (dest_value));
1374 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1375 gboolean post_avg, gboolean post_max)
1377 GstTagList *taglist = NULL;
1379 if (post_min && parse->priv->post_min_bitrate) {
1380 taglist = gst_tag_list_new_empty ();
1382 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1383 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1386 if (post_avg && parse->priv->post_avg_bitrate) {
1387 if (taglist == NULL)
1388 taglist = gst_tag_list_new_empty ();
1390 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1391 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1392 parse->priv->avg_bitrate, NULL);
1395 if (post_max && parse->priv->post_max_bitrate) {
1396 if (taglist == NULL)
1397 taglist = gst_tag_list_new_empty ();
1399 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1400 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1403 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1404 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1405 parse->priv->max_bitrate);
1407 if (taglist != NULL) {
1408 gst_pad_push_event (parse->srcpad, gst_event_new_tag (taglist));
1412 /* gst_base_parse_update_bitrates:
1413 * @parse: #GstBaseParse.
1414 * @buffer: Current frame as a #GstBuffer
1416 * Keeps track of the minimum and maximum bitrates, and also maintains a
1417 * running average bitrate of the stream so far.
1420 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1422 /* Only update the tag on a 10 kbps delta */
1423 static const gint update_threshold = 10000;
1425 guint64 data_len, frame_dur;
1426 gint overhead, frame_bitrate, old_avg_bitrate;
1427 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1428 GstBuffer *buffer = frame->buffer;
1430 overhead = frame->overhead;
1434 data_len = gst_buffer_get_size (buffer) - overhead;
1435 parse->priv->data_bytecount += data_len;
1437 /* duration should be valid by now,
1438 * either set by subclass or maybe based on fps settings */
1439 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1440 /* Calculate duration of a frame from buffer properties */
1441 frame_dur = GST_BUFFER_DURATION (buffer);
1442 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1443 parse->priv->acc_duration;
1446 /* No way to figure out frame duration (is this even possible?) */
1450 /* override if subclass provided bitrate, e.g. metadata based */
1451 if (parse->priv->bitrate) {
1452 parse->priv->avg_bitrate = parse->priv->bitrate;
1453 /* spread this (confirmed) info ASAP */
1454 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1455 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1459 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1463 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1464 parse->priv->avg_bitrate);
1466 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1468 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1469 /* always post all at threshold time */
1470 update_min = update_max = update_avg = TRUE;
1473 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1474 if (frame_bitrate < parse->priv->min_bitrate) {
1475 parse->priv->min_bitrate = frame_bitrate;
1479 if (frame_bitrate > parse->priv->max_bitrate) {
1480 parse->priv->max_bitrate = frame_bitrate;
1484 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1485 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1486 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1491 if ((update_min || update_avg || update_max))
1492 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1494 /* If average bitrate changes that much and no valid (time) duration provided,
1495 * then post a new duration message so applications can update their cached
1497 if (update_avg && !(parse->priv->duration_fmt == GST_FORMAT_TIME &&
1498 GST_CLOCK_TIME_IS_VALID (parse->priv->duration)))
1499 gst_element_post_message (GST_ELEMENT (parse),
1500 gst_message_new_duration (GST_OBJECT (parse), GST_FORMAT_TIME, -1));
1507 * gst_base_parse_add_index_entry:
1508 * @parse: #GstBaseParse.
1509 * @offset: offset of entry
1510 * @ts: timestamp associated with offset
1511 * @key: whether entry refers to keyframe
1512 * @force: add entry disregarding sanity checks
1514 * Adds an entry to the index associating @offset to @ts. It is recommended
1515 * to only add keyframe entries. @force allows to bypass checks, such as
1516 * whether the stream is (upstream) seekable, another entry is already "close"
1517 * to the new entry, etc.
1519 * Returns: #gboolean indicating whether entry was added
1524 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1525 GstClockTime ts, gboolean key, gboolean force)
1527 gboolean ret = FALSE;
1528 GstIndexAssociation associations[2];
1530 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1531 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1533 if (G_LIKELY (!force)) {
1535 if (!parse->priv->upstream_seekable) {
1536 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1540 /* FIXME need better helper data structure that handles these issues
1541 * related to ongoing collecting of index entries */
1542 if (parse->priv->index_last_offset >= (gint64) offset) {
1543 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1544 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1548 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1549 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1550 parse->priv->idx_interval) {
1551 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1552 GST_TIME_ARGS (parse->priv->index_last_ts));
1556 /* if last is not really the last one */
1557 if (!parse->priv->index_last_valid) {
1558 GstClockTime prev_ts;
1560 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1561 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1562 GST_DEBUG_OBJECT (parse,
1563 "entry too close to existing entry %" GST_TIME_FORMAT,
1564 GST_TIME_ARGS (prev_ts));
1565 parse->priv->index_last_offset = offset;
1566 parse->priv->index_last_ts = ts;
1572 associations[0].format = GST_FORMAT_TIME;
1573 associations[0].value = ts;
1574 associations[1].format = GST_FORMAT_BYTES;
1575 associations[1].value = offset;
1577 /* index might change on-the-fly, although that would be nutty app ... */
1578 GST_BASE_PARSE_INDEX_LOCK (parse);
1579 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1580 (key) ? GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT :
1581 GST_INDEX_ASSOCIATION_FLAG_DELTA_UNIT, 2,
1582 (const GstIndexAssociation *) &associations);
1583 GST_BASE_PARSE_INDEX_UNLOCK (parse);
1586 parse->priv->index_last_offset = offset;
1587 parse->priv->index_last_ts = ts;
1596 /* check for seekable upstream, above and beyond a mere query */
1598 gst_base_parse_check_seekability (GstBaseParse * parse)
1601 gboolean seekable = FALSE;
1602 gint64 start = -1, stop = -1;
1603 guint idx_interval = 0;
1605 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1606 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1607 GST_DEBUG_OBJECT (parse, "seeking query failed");
1611 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1613 /* try harder to query upstream size if we didn't get it the first time */
1614 if (seekable && stop == -1) {
1615 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1616 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1619 /* if upstream doesn't know the size, it's likely that it's not seekable in
1620 * practice even if it technically may be seekable */
1621 if (seekable && (start != 0 || stop <= start)) {
1622 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1626 /* let's not put every single frame into our index */
1628 if (stop < 10 * 1024 * 1024)
1630 else if (stop < 100 * 1024 * 1024)
1633 idx_interval = 1000;
1637 gst_query_unref (query);
1639 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1640 G_GUINT64_FORMAT ")", seekable, start, stop);
1641 parse->priv->upstream_seekable = seekable;
1642 parse->priv->upstream_size = seekable ? stop : 0;
1644 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1645 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1648 /* some misc checks on upstream */
1650 gst_base_parse_check_upstream (GstBaseParse * parse)
1654 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
1655 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1656 /* upstream has one, accept it also, and no further updates */
1657 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1658 parse->priv->upstream_has_duration = TRUE;
1661 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1662 parse->priv->upstream_has_duration);
1665 /* checks src caps to determine if dealing with audio or video */
1666 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1668 gst_base_parse_check_media (GstBaseParse * parse)
1673 caps = gst_pad_get_current_caps (parse->srcpad);
1674 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1675 parse->priv->is_video =
1676 g_str_has_prefix (gst_structure_get_name (s), "video");
1678 /* historical default */
1679 parse->priv->is_video = FALSE;
1682 gst_caps_unref (caps);
1684 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1687 /* takes ownership of frame */
1689 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1691 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1692 /* frame allocated on the heap, we can just take ownership */
1693 g_queue_push_tail (&parse->priv->queued_frames, frame);
1694 GST_TRACE ("queued frame %p", frame);
1696 GstBaseParseFrame *copy;
1698 /* probably allocated on the stack, must make a proper copy */
1699 copy = gst_base_parse_frame_copy (frame);
1700 g_queue_push_tail (&parse->priv->queued_frames, copy);
1701 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1702 gst_base_parse_frame_free (frame);
1706 /* gst_base_parse_handle_and_push_buffer:
1707 * @parse: #GstBaseParse.
1708 * @klass: #GstBaseParseClass.
1709 * @frame: (transfer full): a #GstBaseParseFrame
1711 * Parses the frame from given buffer and pushes it forward. Also performs
1712 * timestamp handling and checks the segment limits.
1714 * This is called with srcpad STREAM_LOCK held.
1716 * Returns: #GstFlowReturn
1718 static GstFlowReturn
1719 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1720 GstBaseParseClass * klass, GstBaseParseFrame * frame)
1726 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1728 buffer = frame->buffer;
1730 if (parse->priv->discont) {
1731 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1732 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1733 parse->priv->discont = FALSE;
1736 /* some one-time start-up */
1737 if (G_UNLIKELY (!parse->priv->framecount)) {
1738 gst_base_parse_check_seekability (parse);
1739 gst_base_parse_check_upstream (parse);
1742 GST_LOG_OBJECT (parse,
1743 "parsing frame at offset %" G_GUINT64_FORMAT
1744 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
1745 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1746 gst_buffer_get_size (buffer));
1748 /* use default handler to provide initial (upstream) metadata */
1749 gst_base_parse_parse_frame (parse, frame);
1751 /* store offset as it might get overwritten */
1752 offset = GST_BUFFER_OFFSET (buffer);
1753 ret = klass->parse_frame (parse, frame);
1755 buffer = frame->buffer;
1756 /* subclass must play nice */
1757 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1759 /* check if subclass/format can provide ts.
1760 * If so, that allows and enables extra seek and duration determining options */
1761 if (G_UNLIKELY (parse->priv->first_frame_offset < 0 && ret == GST_FLOW_OK)) {
1762 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1763 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1764 parse->priv->first_frame_offset = offset;
1765 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1766 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1767 " for first frame at offset %" G_GINT64_FORMAT,
1768 GST_TIME_ARGS (parse->priv->first_frame_ts),
1769 parse->priv->first_frame_offset);
1770 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1772 GstClockTime last_ts = G_MAXINT64;
1774 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1775 gst_base_parse_locate_time (parse, &last_ts, &off);
1776 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1777 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1780 /* disable further checks */
1781 parse->priv->first_frame_offset = 0;
1785 /* again use default handler to add missing metadata;
1786 * we may have new information on frame properties */
1787 gst_base_parse_parse_frame (parse, frame);
1788 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1789 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1790 parse->priv->next_ts =
1791 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1793 /* we lost track, do not produce bogus time next time around
1794 * (probably means parser subclass has given up on parsing as well) */
1795 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1796 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1799 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1800 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1801 gst_base_parse_add_index_entry (parse, offset,
1802 GST_BUFFER_TIMESTAMP (buffer),
1803 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1805 /* First buffers are dropped, this means that the subclass needs more
1806 * frames to decide on the format and queues them internally */
1807 /* convert internal flow to OK and mark discont for the next buffer. */
1808 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1809 gst_base_parse_frame_free (frame);
1811 } else if (ret == GST_BASE_PARSE_FLOW_QUEUED) {
1812 gst_base_parse_queue_frame (parse, frame);
1814 } else if (ret != GST_FLOW_OK) {
1818 /* All OK, push queued frames if there are any */
1819 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1820 GstBaseParseFrame *queued_frame;
1822 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1823 gst_base_parse_push_frame (parse, queued_frame);
1827 return gst_base_parse_push_frame (parse, frame);
1831 * gst_base_parse_push_frame:
1832 * @parse: #GstBaseParse.
1833 * @frame: (transfer full): a #GstBaseParseFrame
1835 * Pushes the frame downstream, sends any pending events and
1836 * does some timestamp and segment handling. Takes ownership
1837 * of @frame and will clear it (if it was initialised with
1838 * gst_base_parse_frame_init()) or free it.
1840 * This must be called with sinkpad STREAM_LOCK held.
1842 * Returns: #GstFlowReturn
1847 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1849 GstFlowReturn ret = GST_FLOW_OK;
1850 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1851 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1852 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1856 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1857 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1859 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1861 buffer = frame->buffer;
1863 GST_LOG_OBJECT (parse,
1864 "processing buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT
1865 ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer),
1866 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1867 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1870 size = gst_buffer_get_size (buffer);
1871 parse->priv->bytecount += size;
1872 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1873 parse->priv->framecount++;
1874 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1875 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1878 /* 0 means disabled */
1879 if (parse->priv->update_interval < 0)
1880 parse->priv->update_interval = 50;
1881 else if (parse->priv->update_interval > 0 &&
1882 (parse->priv->framecount % parse->priv->update_interval) == 0)
1883 gst_base_parse_update_duration (parse);
1885 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1886 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1887 if (last_start != GST_CLOCK_TIME_NONE
1888 && GST_BUFFER_DURATION_IS_VALID (buffer))
1889 last_stop = last_start + GST_BUFFER_DURATION (buffer);
1891 /* should have caps by now */
1892 if (!gst_pad_has_current_caps (parse->srcpad))
1895 /* segment adjustment magic; only if we are running the whole show */
1896 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
1897 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
1898 parse->priv->upstream_seekable)) {
1899 /* segment times are typically estimates,
1900 * actual frame data might lead subclass to different timestamps,
1901 * so override segment start from what is supplied there */
1902 if (G_UNLIKELY (parse->priv->pending_segment && !parse->priv->exact_position
1903 && GST_CLOCK_TIME_IS_VALID (last_start))) {
1904 gst_event_unref (parse->priv->pending_segment);
1905 parse->segment.start =
1906 MIN ((guint64) last_start, (guint64) parse->segment.stop);
1908 GST_DEBUG_OBJECT (parse,
1909 "adjusting pending segment start to %" GST_TIME_FORMAT,
1910 GST_TIME_ARGS (parse->segment.start));
1912 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
1914 /* handle gaps, e.g. non-zero start-time, in as much not handled by above */
1915 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
1916 GST_CLOCK_TIME_IS_VALID (last_start)) {
1917 GstClockTimeDiff diff;
1919 /* only send newsegments with increasing start times,
1920 * otherwise if these go back and forth downstream (sinks) increase
1921 * accumulated time and running_time */
1922 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
1923 if (G_UNLIKELY (diff > 2 * GST_SECOND
1924 && last_start > parse->segment.start
1925 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
1926 || last_start < parse->segment.stop))) {
1928 GST_DEBUG_OBJECT (parse,
1929 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
1930 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
1931 "Sending updated NEWSEGMENT events", diff,
1932 GST_TIME_ARGS (parse->segment.position),
1933 GST_TIME_ARGS (last_start));
1935 if (G_UNLIKELY (parse->priv->pending_segment)) {
1936 gst_event_unref (parse->priv->pending_segment);
1937 parse->segment.start = last_start;
1938 parse->segment.time = last_start;
1939 parse->priv->pending_segment =
1940 gst_event_new_segment (&parse->segment);
1942 /* skip gap FIXME */
1943 gst_pad_push_event (parse->srcpad,
1944 gst_event_new_segment (&parse->segment));
1946 parse->segment.position = last_start;
1951 /* and should then also be linked downstream, so safe to send some events */
1952 if (G_UNLIKELY (parse->priv->close_segment)) {
1953 /* only set up by loop */
1954 GST_DEBUG_OBJECT (parse, "loop sending close segment");
1955 gst_pad_push_event (parse->srcpad, parse->priv->close_segment);
1956 parse->priv->close_segment = NULL;
1958 if (G_UNLIKELY (parse->priv->pending_segment)) {
1959 GstEvent *pending_segment;
1961 pending_segment = parse->priv->pending_segment;
1962 parse->priv->pending_segment = NULL;
1964 GST_DEBUG_OBJECT (parse, "%s push pending segment",
1965 parse->priv->pad_mode == GST_PAD_MODE_PULL ? "loop" : "chain");
1966 gst_pad_push_event (parse->srcpad, pending_segment);
1968 /* have caps; check identity */
1969 gst_base_parse_check_media (parse);
1972 /* update bitrates and optionally post corresponding tags
1973 * (following newsegment) */
1974 gst_base_parse_update_bitrates (parse, frame);
1976 if (G_UNLIKELY (parse->priv->pending_events)) {
1979 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
1980 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
1982 g_list_free (parse->priv->pending_events);
1983 parse->priv->pending_events = NULL;
1986 if (klass->pre_push_frame) {
1987 ret = klass->pre_push_frame (parse, frame);
1989 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
1992 /* take final ownership of frame buffer */
1993 buffer = frame->buffer;
1994 frame->buffer = NULL;
1996 /* subclass must play nice */
1997 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1999 parse->priv->seen_keyframe |= parse->priv->is_video &&
2000 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
2002 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
2003 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2004 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
2005 GST_BUFFER_TIMESTAMP (buffer) >
2006 parse->segment.stop + parse->priv->lead_out_ts) {
2007 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
2009 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2010 GST_BUFFER_DURATION_IS_VALID (buffer) &&
2011 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
2012 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
2013 parse->priv->lead_in_ts < parse->segment.start) {
2014 if (parse->priv->seen_keyframe) {
2015 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
2018 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
2019 ret = GST_BASE_PARSE_FLOW_DROPPED;
2026 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2027 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2028 gst_buffer_unref (buffer);
2030 } else if (ret == GST_FLOW_OK) {
2031 if (parse->segment.rate > 0.0) {
2032 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2034 ret = gst_pad_push (parse->srcpad, buffer);
2035 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2037 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2039 parse->priv->buffers_queued =
2040 g_slist_prepend (parse->priv->buffers_queued, buffer);
2044 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2045 size, gst_flow_get_name (ret));
2046 gst_buffer_unref (buffer);
2047 /* if we are not sufficiently in control, let upstream decide on EOS */
2048 if (ret == GST_FLOW_EOS &&
2049 (parse->priv->passthrough ||
2050 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2051 !parse->priv->upstream_seekable)))
2055 /* Update current running segment position */
2056 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
2057 parse->segment.position < last_stop)
2058 parse->segment.position = last_stop;
2060 gst_base_parse_frame_free (frame);
2067 GST_ELEMENT_ERROR (parse, STREAM, DECODE, ("No caps set"), (NULL));
2068 return GST_FLOW_ERROR;
2073 /* gst_base_parse_drain:
2075 * Drains the adapter until it is empty. It decreases the min_frame_size to
2076 * match the current adapter size and calls chain method until the adapter
2077 * is emptied or chain returns with error.
2080 gst_base_parse_drain (GstBaseParse * parse)
2084 GST_DEBUG_OBJECT (parse, "draining");
2085 parse->priv->drain = TRUE;
2088 avail = gst_adapter_available (parse->priv->adapter);
2092 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2093 NULL) != GST_FLOW_OK) {
2097 /* nothing changed, maybe due to truncated frame; break infinite loop */
2098 if (avail == gst_adapter_available (parse->priv->adapter)) {
2099 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2100 gst_adapter_clear (parse->priv->adapter);
2104 parse->priv->drain = FALSE;
2107 /* gst_base_parse_send_buffers
2109 * Sends buffers collected in send_buffers downstream, and ensures that list
2110 * is empty at the end (errors or not).
2112 static GstFlowReturn
2113 gst_base_parse_send_buffers (GstBaseParse * parse)
2115 GSList *send = NULL;
2117 GstFlowReturn ret = GST_FLOW_OK;
2119 send = parse->priv->buffers_send;
2123 buf = GST_BUFFER_CAST (send->data);
2124 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
2125 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2126 ", offset %" G_GINT64_FORMAT, buf,
2127 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
2128 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2130 /* iterate output queue an push downstream */
2131 ret = gst_pad_push (parse->srcpad, buf);
2132 send = g_slist_delete_link (send, send);
2134 /* clear any leftover if error */
2135 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2137 buf = GST_BUFFER_CAST (send->data);
2138 gst_buffer_unref (buf);
2139 send = g_slist_delete_link (send, send);
2144 parse->priv->buffers_send = send;
2149 /* gst_base_parse_process_fragment:
2151 * Processes a reverse playback (forward) fragment:
2152 * - append head of last fragment that was skipped to current fragment data
2153 * - drain the resulting current fragment data (i.e. repeated chain)
2154 * - add time/duration (if needed) to frames queued by chain
2155 * - push queued data
2157 static GstFlowReturn
2158 gst_base_parse_process_fragment (GstBaseParse * parse, gboolean push_only)
2161 GstFlowReturn ret = GST_FLOW_OK;
2162 gboolean seen_key = FALSE, seen_delta = FALSE;
2168 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2169 while (parse->priv->buffers_pending) {
2170 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2171 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2172 gst_buffer_get_size (buf));
2173 gst_adapter_push (parse->priv->adapter, buf);
2174 parse->priv->buffers_pending =
2175 g_slist_delete_link (parse->priv->buffers_pending,
2176 parse->priv->buffers_pending);
2179 /* invalidate so no fall-back timestamping is performed;
2180 * ok if taken from subclass or upstream */
2181 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2182 /* prevent it hanging around stop all the time */
2183 parse->segment.position = GST_CLOCK_TIME_NONE;
2185 parse->priv->discont = TRUE;
2187 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2188 /* initial skipped data is added to buffers_pending */
2189 gst_base_parse_drain (parse);
2192 if (parse->priv->buffers_send) {
2193 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2194 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2197 /* add metadata (if needed to queued buffers */
2198 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2199 GST_TIME_ARGS (parse->priv->last_ts));
2200 while (parse->priv->buffers_queued) {
2201 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2203 /* no touching if upstream or parsing provided time */
2204 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2205 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2206 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2207 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2208 GST_BUFFER_DURATION_IS_VALID (buf)) {
2209 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2210 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2212 parse->priv->last_ts = 0;
2213 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2214 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2215 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2217 /* no idea, very bad */
2218 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2221 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2223 /* reverse order for ascending sending */
2224 /* send downstream at keyframe not preceded by a keyframe
2225 * (e.g. that should identify start of collection of IDR nals) */
2226 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2228 ret = gst_base_parse_send_buffers (parse);
2229 /* if a problem, throw all to sending */
2230 if (ret != GST_FLOW_OK) {
2231 parse->priv->buffers_send =
2232 g_slist_reverse (parse->priv->buffers_queued);
2233 parse->priv->buffers_queued = NULL;
2242 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2244 parse->priv->buffers_send =
2245 g_slist_prepend (parse->priv->buffers_send, buf);
2246 parse->priv->buffers_queued =
2247 g_slist_delete_link (parse->priv->buffers_queued,
2248 parse->priv->buffers_queued);
2251 /* audio may have all marked as keyframe, so arrange to send here */
2253 ret = gst_base_parse_send_buffers (parse);
2255 /* any trailing unused no longer usable (ideally none) */
2256 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2257 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2258 gst_adapter_available (parse->priv->adapter));
2259 gst_adapter_clear (parse->priv->adapter);
2265 /* small helper that checks whether we have been trying to resync too long */
2266 static inline GstFlowReturn
2267 gst_base_parse_check_sync (GstBaseParse * parse)
2269 if (G_UNLIKELY (parse->priv->discont &&
2270 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2271 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2272 ("Failed to parse stream"), (NULL));
2273 return GST_FLOW_ERROR;
2279 static GstFlowReturn
2280 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
2282 GstBaseParseClass *bclass;
2283 GstBaseParse *parse;
2284 GstFlowReturn ret = GST_FLOW_OK;
2285 GstBuffer *outbuf = NULL;
2286 GstBuffer *tmpbuf = NULL;
2290 guint old_min_size = 0, min_size, av;
2291 GstClockTime timestamp;
2292 GstBaseParseFrame *frame;
2294 parse = GST_BASE_PARSE (parent);
2295 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2297 if (parse->priv->detecting) {
2298 GstBuffer *detect_buf;
2300 if (parse->priv->detect_buffers_size == 0) {
2301 detect_buf = gst_buffer_ref (buffer);
2306 detect_buf = gst_buffer_new ();
2308 for (l = parse->priv->detect_buffers; l; l = l->next) {
2309 gsize tmpsize = gst_buffer_get_size (l->data);
2311 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
2312 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
2316 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
2317 offset, gst_buffer_get_size (buffer));
2320 ret = bclass->detect (parse, detect_buf);
2321 gst_buffer_unref (detect_buf);
2323 if (ret == GST_FLOW_OK) {
2326 /* Detected something */
2327 parse->priv->detecting = FALSE;
2329 for (l = parse->priv->detect_buffers; l; l = l->next) {
2330 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2332 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2333 parent, GST_BUFFER_CAST (l->data));
2335 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2337 g_list_free (parse->priv->detect_buffers);
2338 parse->priv->detect_buffers = NULL;
2339 parse->priv->detect_buffers_size = 0;
2341 if (ret != GST_FLOW_OK) {
2345 /* Handle the current buffer */
2346 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2347 /* Still detecting, append buffer or error out if draining */
2349 if (parse->priv->drain) {
2350 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2351 return GST_FLOW_ERROR;
2352 } else if (parse->priv->flushing) {
2353 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2355 g_list_free (parse->priv->detect_buffers);
2356 parse->priv->detect_buffers = NULL;
2357 parse->priv->detect_buffers_size = 0;
2359 parse->priv->detect_buffers =
2360 g_list_append (parse->priv->detect_buffers, buffer);
2361 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
2365 /* Something went wrong, subclass responsible for error reporting */
2369 /* And now handle the current buffer if detection worked */
2372 frame = &parse->priv->frame;
2374 if (G_LIKELY (buffer)) {
2375 GST_LOG_OBJECT (parse,
2376 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT,
2377 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer));
2378 if (G_UNLIKELY (parse->priv->passthrough)) {
2379 gst_base_parse_frame_init (frame);
2380 frame->buffer = gst_buffer_make_writable (buffer);
2381 return gst_base_parse_push_frame (parse, frame);
2383 /* upstream feeding us in reverse playback;
2384 * gather each fragment, then process it in single run */
2385 if (parse->segment.rate < 0.0) {
2386 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2387 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2388 ret = gst_base_parse_process_fragment (parse, FALSE);
2390 gst_adapter_push (parse->priv->adapter, buffer);
2393 gst_adapter_push (parse->priv->adapter, buffer);
2396 if (G_UNLIKELY (buffer &&
2397 GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2398 frame->_private_flags |= GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
2399 gst_base_parse_frame_free (frame);
2402 /* Parse and push as many frames as possible */
2403 /* Stop either when adapter is empty or we are flushing */
2404 while (!parse->priv->flushing) {
2407 /* maintain frame state for a single frame parsing round across _chain calls,
2408 * so only init when needed */
2409 if (!frame->_private_flags)
2410 gst_base_parse_frame_init (frame);
2412 tmpbuf = gst_buffer_new ();
2415 /* Synchronization loop */
2417 /* note: if subclass indicates MAX fsize,
2418 * this will not likely be available anyway ... */
2419 min_size = MAX (parse->priv->min_frame_size, fsize);
2420 av = gst_adapter_available (parse->priv->adapter);
2422 /* loop safety check */
2423 if (G_UNLIKELY (old_min_size >= min_size))
2425 old_min_size = min_size;
2427 if (G_UNLIKELY (parse->priv->drain)) {
2429 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2430 if (G_UNLIKELY (!min_size)) {
2431 gst_buffer_unref (tmpbuf);
2436 /* Collect at least min_frame_size bytes */
2437 if (av < min_size) {
2438 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)",
2440 gst_buffer_unref (tmpbuf);
2444 /* always pass all available data */
2445 data = gst_adapter_map (parse->priv->adapter, av);
2446 gst_buffer_take_memory (tmpbuf, -1,
2447 gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY,
2448 (gpointer) data, NULL, av, 0, av));
2449 GST_BUFFER_OFFSET (tmpbuf) = parse->priv->offset;
2451 if (parse->priv->discont) {
2452 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2453 GST_BUFFER_FLAG_SET (tmpbuf, GST_BUFFER_FLAG_DISCONT);
2457 gst_base_parse_frame_update (parse, frame, tmpbuf);
2458 res = bclass->check_valid_frame (parse, frame, &fsize, &skip);
2459 gst_adapter_unmap (parse->priv->adapter);
2460 gst_buffer_replace (&frame->buffer, NULL);
2461 gst_buffer_remove_memory_range (tmpbuf, 0, -1);
2463 if (gst_adapter_available (parse->priv->adapter) < fsize) {
2464 GST_DEBUG_OBJECT (parse, "found valid frame but not enough data"
2465 " available (only %" G_GSIZE_FORMAT " bytes)",
2466 gst_adapter_available (parse->priv->adapter));
2467 gst_buffer_unref (tmpbuf);
2470 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2474 /* subclass didn't touch this value. By default we skip 1 byte */
2478 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2479 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2480 /* reverse playback, and no frames found yet, so we are skipping
2481 * the leading part of a fragment, which may form the tail of
2482 * fragment coming later, hopefully subclass skips efficiently ... */
2483 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2484 outbuf = gst_adapter_take_buffer (parse->priv->adapter, skip);
2485 outbuf = gst_buffer_make_writable (outbuf);
2486 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
2487 parse->priv->buffers_pending =
2488 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2491 gst_adapter_flush (parse->priv->adapter, skip);
2493 parse->priv->offset += skip;
2494 if (!parse->priv->discont)
2495 parse->priv->sync_offset = parse->priv->offset;
2496 parse->priv->discont = TRUE;
2497 /* something changed least; nullify loop check */
2500 /* skip == 0 should imply subclass set min_size to need more data;
2501 * we check this shortly */
2502 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2503 gst_buffer_unref (tmpbuf);
2507 gst_buffer_unref (tmpbuf);
2511 /* Subclass found the sync, but still wants to skip some data */
2512 GST_LOG_OBJECT (parse, "skipping %d bytes", skip);
2513 gst_adapter_flush (parse->priv->adapter, skip);
2514 parse->priv->offset += skip;
2517 /* Grab lock to prevent a race with FLUSH_START handler */
2518 GST_PAD_STREAM_LOCK (parse->srcpad);
2520 /* FLUSH_START event causes the "flushing" flag to be set. In this
2521 * case we can leave the frame pushing loop */
2522 if (parse->priv->flushing) {
2523 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2527 /* move along with upstream timestamp (if any),
2528 * but interpolate in between */
2529 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2530 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2531 (parse->priv->prev_ts != timestamp)) {
2532 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2535 /* FIXME: Would it be more efficient to make a subbuffer instead? */
2536 outbuf = gst_adapter_take_buffer (parse->priv->adapter, fsize);
2537 outbuf = gst_buffer_make_writable (outbuf);
2539 /* Subclass may want to know the data offset */
2540 GST_BUFFER_OFFSET (outbuf) = parse->priv->offset;
2541 parse->priv->offset += fsize;
2542 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2543 GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
2545 frame->buffer = outbuf;
2546 ret = gst_base_parse_handle_and_push_frame (parse, bclass, frame);
2547 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2549 if (ret != GST_FLOW_OK) {
2550 GST_LOG_OBJECT (parse, "push returned %d", ret);
2556 GST_LOG_OBJECT (parse, "chain leaving");
2562 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2563 ("min_size evolution %d -> %d; breaking to avoid looping",
2564 old_min_size, min_size));
2565 return GST_FLOW_ERROR;
2569 /* pull @size bytes at current offset,
2570 * i.e. at least try to and possibly return a shorter buffer if near the end */
2571 static GstFlowReturn
2572 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2573 GstBuffer ** buffer)
2575 GstFlowReturn ret = GST_FLOW_OK;
2577 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2579 /* Caching here actually makes much less difference than one would expect.
2580 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2581 if (parse->priv->cache) {
2582 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2583 gint cache_size = gst_buffer_get_size (parse->priv->cache);
2585 if (cache_offset <= parse->priv->offset &&
2586 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2587 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
2588 parse->priv->offset - cache_offset, size);
2589 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2592 /* not enough data in the cache, free cache and get a new one */
2593 gst_buffer_unref (parse->priv->cache);
2594 parse->priv->cache = NULL;
2597 /* refill the cache */
2599 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2600 64 * 1024), &parse->priv->cache);
2601 if (ret != GST_FLOW_OK) {
2602 parse->priv->cache = NULL;
2606 if (gst_buffer_get_size (parse->priv->cache) >= size) {
2608 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
2610 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2614 /* Not possible to get enough data, try a last time with
2615 * requesting exactly the size we need */
2616 gst_buffer_unref (parse->priv->cache);
2617 parse->priv->cache = NULL;
2619 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2620 &parse->priv->cache);
2622 if (ret != GST_FLOW_OK) {
2623 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2628 if (gst_buffer_get_size (parse->priv->cache) < size) {
2629 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2630 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
2631 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
2633 *buffer = parse->priv->cache;
2634 parse->priv->cache = NULL;
2640 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
2641 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2646 static GstFlowReturn
2647 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2650 GstClockTime ts = 0;
2654 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2655 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2656 parse->priv->last_offset);
2658 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2659 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2660 GST_TIME_ARGS (parse->segment.start));
2665 /* last fragment started at last_offset / last_ts;
2666 * seek back 10s capped at 1MB */
2667 if (parse->priv->last_ts >= 10 * GST_SECOND)
2668 ts = parse->priv->last_ts - 10 * GST_SECOND;
2669 /* if we are exact now, we will be more so going backwards */
2670 if (parse->priv->exact_position) {
2671 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2673 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2674 GST_FORMAT_BYTES, &offset)) {
2675 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2678 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2679 parse->priv->last_offset - 1024);
2680 offset = MAX (0, offset);
2682 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2684 parse->priv->offset = offset;
2686 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2688 if (ret != GST_FLOW_OK)
2691 /* offset will increase again as fragment is processed/parsed */
2692 parse->priv->last_offset = offset;
2694 gst_adapter_push (parse->priv->adapter, buffer);
2695 ret = gst_base_parse_process_fragment (parse, FALSE);
2696 if (ret != GST_FLOW_OK)
2699 /* force previous fragment */
2700 parse->priv->offset = -1;
2707 * pull and scan for next frame starting from current offset
2708 * ajusts sync, drain and offset going along */
2709 static GstFlowReturn
2710 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2711 GstBaseParseFrame * frame, gboolean full)
2713 GstBuffer *buffer, *outbuf;
2714 GstFlowReturn ret = GST_FLOW_OK;
2715 guint fsize = 1, min_size, old_min_size = 0;
2718 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2720 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2721 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2723 /* let's make this efficient for all subclass once and for all;
2724 * maybe it does not need this much, but in the latter case, we know we are
2725 * in pull mode here and might as well try to read and supply more anyway
2726 * (so does the buffer caching mechanism) */
2732 min_size = MAX (parse->priv->min_frame_size, fsize);
2733 /* loop safety check */
2734 if (G_UNLIKELY (old_min_size >= min_size))
2736 old_min_size = min_size;
2738 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2739 if (ret != GST_FLOW_OK)
2742 if (parse->priv->discont) {
2743 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2744 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
2747 /* if we got a short read, inform subclass we are draining leftover
2748 * and no more is to be expected */
2749 if (gst_buffer_get_size (buffer) < min_size)
2750 parse->priv->drain = TRUE;
2752 if (parse->priv->detecting) {
2753 ret = klass->detect (parse, buffer);
2754 if (ret == GST_FLOW_NOT_NEGOTIATED) {
2755 /* If draining we error out, otherwise request a buffer
2757 if (parse->priv->drain) {
2758 gst_buffer_unref (buffer);
2759 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
2760 return GST_FLOW_ERROR;
2763 gst_buffer_unref (buffer);
2766 } else if (ret != GST_FLOW_OK) {
2767 gst_buffer_unref (buffer);
2768 GST_ERROR_OBJECT (parse, "detect() returned %s",
2769 gst_flow_get_name (ret));
2773 /* Else handle this buffer normally */
2777 gst_base_parse_frame_update (parse, frame, buffer);
2778 res = klass->check_valid_frame (parse, frame, &fsize, &skip);
2779 gst_buffer_replace (&frame->buffer, NULL);
2781 parse->priv->drain = FALSE;
2782 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2785 parse->priv->drain = FALSE;
2789 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2790 if (full && parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2791 /* reverse playback, and no frames found yet, so we are skipping
2792 * the leading part of a fragment, which may form the tail of
2793 * fragment coming later, hopefully subclass skips efficiently ... */
2794 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, 0, skip);
2795 parse->priv->buffers_pending =
2796 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2799 parse->priv->offset += skip;
2800 if (!parse->priv->discont)
2801 parse->priv->sync_offset = parse->priv->offset;
2802 parse->priv->discont = TRUE;
2803 /* something changed at least; nullify loop check */
2804 if (fsize == G_MAXUINT)
2805 fsize = old_min_size + 64 * 1024;
2808 /* skip == 0 should imply subclass set min_size to need more data;
2809 * we check this shortly */
2810 GST_DEBUG_OBJECT (parse, "finding sync...");
2811 gst_buffer_unref (buffer);
2812 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2817 /* Does the subclass want to skip too? */
2819 parse->priv->offset += skip;
2823 if (fsize + skip <= gst_buffer_get_size (buffer)) {
2824 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, skip, fsize);
2825 GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer) + skip;
2826 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2827 gst_buffer_unref (buffer);
2829 gst_buffer_unref (buffer);
2830 ret = gst_base_parse_pull_range (parse, fsize, &outbuf);
2831 if (ret != GST_FLOW_OK)
2833 if (gst_buffer_get_size (outbuf) < fsize) {
2834 gst_buffer_unref (outbuf);
2839 parse->priv->offset += fsize;
2841 frame->buffer = outbuf;
2849 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2850 ("min_size evolution %d -> %d; breaking to avoid looping",
2851 old_min_size, min_size));
2852 return GST_FLOW_ERROR;
2856 /* Loop that is used in pull mode to retrieve data from upstream */
2858 gst_base_parse_loop (GstPad * pad)
2860 GstBaseParse *parse;
2861 GstBaseParseClass *klass;
2862 GstFlowReturn ret = GST_FLOW_OK;
2863 GstBaseParseFrame frame;
2865 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2866 klass = GST_BASE_PARSE_GET_CLASS (parse);
2868 /* reverse playback:
2869 * first fragment (closest to stop time) is handled normally below,
2870 * then we pull in fragments going backwards */
2871 if (parse->segment.rate < 0.0) {
2872 /* check if we jumped back to a previous fragment,
2873 * which is a post-first fragment */
2874 if (parse->priv->offset < 0) {
2875 ret = gst_base_parse_handle_previous_fragment (parse);
2880 gst_base_parse_frame_init (&frame);
2881 ret = gst_base_parse_scan_frame (parse, klass, &frame, TRUE);
2882 if (ret != GST_FLOW_OK)
2885 /* This always cleans up frame, even if error occurs */
2886 ret = gst_base_parse_handle_and_push_frame (parse, klass, &frame);
2888 /* eat expected eos signalling past segment in reverse playback */
2889 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
2890 parse->segment.position >= parse->segment.stop) {
2891 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2892 /* push what was accumulated during loop run */
2893 gst_base_parse_process_fragment (parse, TRUE);
2894 /* force previous fragment */
2895 parse->priv->offset = -1;
2900 if (ret == GST_FLOW_EOS)
2902 else if (ret != GST_FLOW_OK)
2905 gst_object_unref (parse);
2912 GST_DEBUG_OBJECT (parse, "eos");
2917 gboolean push_eos = FALSE;
2919 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2920 gst_flow_get_name (ret));
2921 gst_pad_pause_task (parse->sinkpad);
2923 if (ret == GST_FLOW_EOS) {
2924 /* handle end-of-stream/segment */
2925 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2928 if ((stop = parse->segment.stop) == -1)
2929 stop = parse->segment.duration;
2931 GST_DEBUG_OBJECT (parse, "sending segment_done");
2933 gst_element_post_message
2934 (GST_ELEMENT_CAST (parse),
2935 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2936 GST_FORMAT_TIME, stop));
2938 /* If we STILL have zero frames processed, fire an error */
2939 if (parse->priv->framecount == 0) {
2940 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2941 ("No valid frames found before end of stream"), (NULL));
2945 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
2946 /* for fatal errors we post an error message, wrong-state is
2947 * not fatal because it happens due to flushes and only means
2948 * that we should stop now. */
2949 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2950 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
2954 /* newsegment before eos */
2955 if (parse->priv->pending_segment) {
2956 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
2957 parse->priv->pending_segment = NULL;
2959 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
2961 gst_object_unref (parse);
2966 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
2968 GstBaseParse *parse;
2969 gboolean result = TRUE;
2973 parse = GST_BASE_PARSE (parent);
2975 GST_DEBUG_OBJECT (parse, "sink activate");
2977 query = gst_query_new_scheduling ();
2978 result = gst_pad_peer_query (sinkpad, query);
2980 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL);
2984 gst_query_unref (query);
2987 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
2988 result = gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE);
2990 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
2991 result = gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
2994 GST_DEBUG_OBJECT (parse, "sink activate return %d", result);
2999 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
3001 GstBaseParseClass *klass;
3002 gboolean result = TRUE;
3004 GST_DEBUG_OBJECT (parse, "activate %d", active);
3006 klass = GST_BASE_PARSE_GET_CLASS (parse);
3009 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
3010 result = klass->start (parse);
3012 /* If the subclass implements ::detect we want to
3013 * call it for the first buffers now */
3014 parse->priv->detecting = (klass->detect != NULL);
3016 /* We must make sure streaming has finished before resetting things
3017 * and calling the ::stop vfunc */
3018 GST_PAD_STREAM_LOCK (parse->sinkpad);
3019 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3021 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
3022 result = klass->stop (parse);
3024 parse->priv->pad_mode = GST_PAD_MODE_NONE;
3026 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
3031 gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
3032 GstPadMode mode, gboolean active)
3034 gboolean result = TRUE;
3035 GstBaseParse *parse;
3037 parse = GST_BASE_PARSE (parent);
3039 GST_DEBUG_OBJECT (parse, "sink activate mode %d, %d", mode, active);
3041 result = gst_base_parse_activate (parse, active);
3045 case GST_PAD_MODE_PULL:
3047 parse->priv->pending_segment =
3048 gst_event_new_segment (&parse->segment);
3050 gst_pad_start_task (pad, (GstTaskFunction) gst_base_parse_loop,
3053 result &= gst_pad_stop_task (pad);
3061 parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
3063 GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
3069 * gst_base_parse_set_duration:
3070 * @parse: #GstBaseParse.
3072 * @duration: duration value.
3073 * @interval: how often to update the duration estimate based on bitrate, or 0.
3075 * Sets the duration of the currently playing media. Subclass can use this
3076 * when it is able to determine duration and/or notices a change in the media
3077 * duration. Alternatively, if @interval is non-zero (default), then stream
3078 * duration is determined based on estimated bitrate, and updated every @interval
3084 gst_base_parse_set_duration (GstBaseParse * parse,
3085 GstFormat fmt, gint64 duration, gint interval)
3087 g_return_if_fail (parse != NULL);
3089 if (parse->priv->upstream_has_duration) {
3090 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3094 if (duration != parse->priv->duration) {
3097 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
3098 gst_element_post_message (GST_ELEMENT (parse), m);
3100 /* TODO: what about duration tag? */
3102 parse->priv->duration = duration;
3103 parse->priv->duration_fmt = fmt;
3104 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3105 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3106 if (interval != 0) {
3107 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3111 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3112 parse->priv->update_interval = interval;
3118 * gst_base_parse_set_average_bitrate:
3119 * @parse: #GstBaseParse.
3120 * @bitrate: average bitrate in bits/second
3122 * Optionally sets the average bitrate detected in media (if non-zero),
3123 * e.g. based on metadata, as it will be posted to the application.
3125 * By default, announced average bitrate is estimated. The average bitrate
3126 * is used to estimate the total duration of the stream and to estimate
3127 * a seek position, if there's no index and the format is syncable
3128 * (see gst_base_parse_set_syncable()).
3133 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3135 parse->priv->bitrate = bitrate;
3136 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3140 * gst_base_parse_set_min_frame_size:
3141 * @parse: #GstBaseParse.
3142 * @min_size: Minimum size of the data that this base class should give to
3145 * Subclass can use this function to tell the base class that it needs to
3146 * give at least #min_size buffers.
3151 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3153 g_return_if_fail (parse != NULL);
3155 parse->priv->min_frame_size = min_size;
3156 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3160 * gst_base_parse_set_frame_rate:
3161 * @parse: the #GstBaseParse to set
3162 * @fps_num: frames per second (numerator).
3163 * @fps_den: frames per second (denominator).
3164 * @lead_in: frames needed before a segment for subsequent decode
3165 * @lead_out: frames needed after a segment
3167 * If frames per second is configured, parser can take care of buffer duration
3168 * and timestamping. When performing segment clipping, or seeking to a specific
3169 * location, a corresponding decoder might need an initial @lead_in and a
3170 * following @lead_out number of frames to ensure the desired segment is
3171 * entirely filled upon decoding.
3176 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3177 guint fps_den, guint lead_in, guint lead_out)
3179 g_return_if_fail (parse != NULL);
3181 parse->priv->fps_num = fps_num;
3182 parse->priv->fps_den = fps_den;
3183 if (!fps_num || !fps_den) {
3184 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3186 fps_num = fps_den = 0;
3187 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3188 parse->priv->lead_in = parse->priv->lead_out = 0;
3189 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3191 parse->priv->frame_duration =
3192 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3193 parse->priv->lead_in = lead_in;
3194 parse->priv->lead_out = lead_out;
3195 parse->priv->lead_in_ts =
3196 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3197 parse->priv->lead_out_ts =
3198 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3199 /* aim for about 1.5s to estimate duration */
3200 if (parse->priv->update_interval < 0) {
3201 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3202 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3203 parse->priv->update_interval);
3206 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3207 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3208 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3209 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3210 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3211 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3215 * gst_base_parse_set_has_timing_info:
3216 * @parse: a #GstBaseParse
3217 * @has_timing: whether frames carry timing information
3219 * Set if frames carry timing information which the subclass can (generally)
3220 * parse and provide. In particular, intrinsic (rather than estimated) time
3221 * can be obtained following a seek.
3226 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3228 parse->priv->has_timing_info = has_timing;
3229 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3233 * gst_base_parse_set_syncable:
3234 * @parse: a #GstBaseParse
3235 * @syncable: set if frame starts can be identified
3237 * Set if frame starts can be identified. This is set by default and
3238 * determines whether seeking based on bitrate averages
3239 * is possible for a format/stream.
3244 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3246 parse->priv->syncable = syncable;
3247 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3251 * gst_base_parse_set_passthrough:
3252 * @parse: a #GstBaseParse
3253 * @passthrough: %TRUE if parser should run in passthrough mode
3255 * Set if the nature of the format or configuration does not allow (much)
3256 * parsing, and the parser should operate in passthrough mode (which only
3257 * applies when operating in push mode). That is, incoming buffers are
3258 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3259 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3260 * so subclass can perform as much or as little is appropriate for
3261 * passthrough semantics in @pre_push_frame.
3266 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3268 parse->priv->passthrough = passthrough;
3269 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3273 * gst_base_parse_set_latency:
3274 * @parse: a #GstBaseParse
3275 * @min_latency: minimum parse latency
3276 * @max_latency: maximum parse latency
3278 * Sets the minimum and maximum (which may likely be equal) latency introduced
3279 * by the parsing process. If there is such a latency, which depends on the
3280 * particular parsing of the format, it typically corresponds to 1 frame duration.
3285 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3286 GstClockTime max_latency)
3288 GST_OBJECT_LOCK (parse);
3289 parse->priv->min_latency = min_latency;
3290 parse->priv->max_latency = max_latency;
3291 GST_OBJECT_UNLOCK (parse);
3292 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3293 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3294 GST_TIME_ARGS (max_latency));
3298 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3299 GstClockTime * duration)
3301 gboolean res = FALSE;
3303 g_return_val_if_fail (duration != NULL, FALSE);
3305 *duration = GST_CLOCK_TIME_NONE;
3306 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3307 GST_LOG_OBJECT (parse, "using provided duration");
3308 *duration = parse->priv->duration;
3310 } else if (parse->priv->duration != -1) {
3311 GST_LOG_OBJECT (parse, "converting provided duration");
3312 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3313 parse->priv->duration, format, (gint64 *) duration);
3314 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3315 GST_LOG_OBJECT (parse, "using estimated duration");
3316 *duration = parse->priv->estimated_duration;
3320 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3321 GST_TIME_ARGS (*duration));
3326 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
3328 GstBaseParse *parse;
3329 gboolean res = FALSE;
3331 parse = GST_BASE_PARSE (parent);
3333 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3335 switch (GST_QUERY_TYPE (query)) {
3336 case GST_QUERY_POSITION:
3341 GST_DEBUG_OBJECT (parse, "position query");
3342 gst_query_parse_position (query, &format, NULL);
3344 /* try upstream first */
3345 res = gst_pad_query_default (pad, parent, query);
3347 /* Fall back on interpreting segment */
3348 GST_OBJECT_LOCK (parse);
3349 if (format == GST_FORMAT_BYTES) {
3350 dest_value = parse->priv->offset;
3352 } else if (format == parse->segment.format &&
3353 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
3354 dest_value = gst_segment_to_stream_time (&parse->segment,
3355 parse->segment.format, parse->segment.position);
3358 GST_OBJECT_UNLOCK (parse);
3360 /* no precise result, upstream no idea either, then best estimate */
3361 /* priv->offset is updated in both PUSH/PULL modes */
3362 res = gst_base_parse_convert (parse,
3363 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3366 gst_query_set_position (query, format, dest_value);
3370 case GST_QUERY_DURATION:
3373 GstClockTime duration;
3375 GST_DEBUG_OBJECT (parse, "duration query");
3376 gst_query_parse_duration (query, &format, NULL);
3378 /* consult upstream */
3379 res = gst_pad_query_default (pad, parent, query);
3381 /* otherwise best estimate from us */
3383 res = gst_base_parse_get_duration (parse, format, &duration);
3385 gst_query_set_duration (query, format, duration);
3389 case GST_QUERY_SEEKING:
3392 GstClockTime duration = GST_CLOCK_TIME_NONE;
3393 gboolean seekable = FALSE;
3395 GST_DEBUG_OBJECT (parse, "seeking query");
3396 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3398 /* consult upstream */
3399 res = gst_pad_query_default (pad, parent, query);
3401 /* we may be able to help if in TIME */
3402 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3403 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3404 /* already OK if upstream takes care */
3405 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3407 if (!(res && seekable)) {
3408 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3409 || duration == -1) {
3410 /* seekable if we still have a chance to get duration later on */
3412 parse->priv->upstream_seekable && parse->priv->update_interval;
3414 seekable = parse->priv->upstream_seekable;
3415 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3418 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3424 case GST_QUERY_FORMATS:
3425 gst_query_set_formatsv (query, 3, fmtlist);
3428 case GST_QUERY_CONVERT:
3430 GstFormat src_format, dest_format;
3431 gint64 src_value, dest_value;
3433 gst_query_parse_convert (query, &src_format, &src_value,
3434 &dest_format, &dest_value);
3436 res = gst_base_parse_convert (parse, src_format, src_value,
3437 dest_format, &dest_value);
3439 gst_query_set_convert (query, src_format, src_value,
3440 dest_format, dest_value);
3444 case GST_QUERY_LATENCY:
3446 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3448 GstClockTime min_latency, max_latency;
3450 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3451 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3452 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3453 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3455 GST_OBJECT_LOCK (parse);
3456 /* add our latency */
3457 if (min_latency != -1)
3458 min_latency += parse->priv->min_latency;
3459 if (max_latency != -1)
3460 max_latency += parse->priv->max_latency;
3461 GST_OBJECT_UNLOCK (parse);
3463 gst_query_set_latency (query, live, min_latency, max_latency);
3468 res = gst_pad_query_default (pad, parent, query);
3474 /* scans for a cluster start from @pos,
3475 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3476 static GstFlowReturn
3477 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3478 GstClockTime * time, GstClockTime * duration)
3480 GstBaseParseClass *klass;
3482 gboolean orig_drain, orig_discont;
3483 GstFlowReturn ret = GST_FLOW_OK;
3484 GstBuffer *buf = NULL;
3485 GstBaseParseFrame frame;
3487 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3488 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3489 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3491 klass = GST_BASE_PARSE_GET_CLASS (parse);
3493 *time = GST_CLOCK_TIME_NONE;
3494 *duration = GST_CLOCK_TIME_NONE;
3497 orig_offset = parse->priv->offset;
3498 orig_discont = parse->priv->discont;
3499 orig_drain = parse->priv->drain;
3501 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3502 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3504 gst_base_parse_frame_init (&frame);
3506 /* jump elsewhere and locate next frame */
3507 parse->priv->offset = *pos;
3508 ret = gst_base_parse_scan_frame (parse, klass, &frame, FALSE);
3509 if (ret != GST_FLOW_OK)
3513 GST_LOG_OBJECT (parse,
3514 "peek parsing frame at offset %" G_GUINT64_FORMAT
3515 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
3516 GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET (buf),
3517 gst_buffer_get_size (buf));
3519 /* get offset first, subclass parsing might dump other stuff in there */
3520 *pos = GST_BUFFER_OFFSET (buf);
3521 ret = klass->parse_frame (parse, &frame);
3524 /* but it should provide proper time */
3525 *time = GST_BUFFER_TIMESTAMP (buf);
3526 *duration = GST_BUFFER_DURATION (buf);
3528 gst_base_parse_frame_free (&frame);
3530 GST_LOG_OBJECT (parse,
3531 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3532 GST_TIME_ARGS (*time), *pos);
3536 parse->priv->offset = orig_offset;
3537 parse->priv->discont = orig_discont;
3538 parse->priv->drain = orig_drain;
3543 /* bisect and scan through file for frame starting before @time,
3544 * returns OK and @time/@offset if found, NONE and/or error otherwise
3545 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3546 static GstFlowReturn
3547 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3550 GstFlowReturn ret = GST_FLOW_OK;
3551 gint64 lpos, hpos, newpos;
3552 GstClockTime time, ltime, htime, newtime, dur;
3553 gboolean cont = TRUE;
3554 const GstClockTime tolerance = TARGET_DIFFERENCE;
3555 const guint chunk = 4 * 1024;
3557 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3558 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3560 GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
3561 GST_TIME_ARGS (*_time));
3563 /* TODO also make keyframe aware if useful some day */
3578 /* do not know at first */
3580 *_time = GST_CLOCK_TIME_NONE;
3582 /* need initial positions; start and end */
3583 lpos = parse->priv->first_frame_offset;
3584 ltime = parse->priv->first_frame_ts;
3585 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
3586 GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
3587 return GST_FLOW_ERROR;
3589 hpos = parse->priv->upstream_size;
3591 GST_DEBUG_OBJECT (parse,
3592 "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
3593 ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, htime,
3594 GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
3596 /* check preconditions are satisfied;
3597 * start and end are needed, except for special case where we scan for
3598 * last frame to determine duration */
3599 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
3600 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3601 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3605 /* shortcut cases */
3608 } else if (time < ltime + tolerance) {
3612 } else if (time >= htime) {
3618 while (htime > ltime && cont) {
3619 GST_LOG_OBJECT (parse,
3620 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3621 GST_TIME_ARGS (ltime));
3622 GST_LOG_OBJECT (parse,
3623 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3624 GST_TIME_ARGS (htime));
3625 if (G_UNLIKELY (time == G_MAXINT64)) {
3627 } else if (G_LIKELY (hpos > lpos)) {
3629 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3632 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3634 /* we check this case once, but not forever, so break loop */
3639 newpos = CLAMP (newpos, lpos, hpos);
3640 GST_LOG_OBJECT (parse,
3641 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3642 GST_TIME_ARGS (time), newpos);
3644 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3645 if (ret == GST_FLOW_EOS) {
3646 /* heuristic HACK */
3647 hpos = MAX (lpos, hpos - chunk);
3649 } else if (ret != GST_FLOW_OK) {
3653 if (newtime == -1 || newpos == -1) {
3654 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3658 if (G_UNLIKELY (time == G_MAXINT64)) {
3661 if (GST_CLOCK_TIME_IS_VALID (dur))
3664 } else if (newtime > time) {
3666 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3668 } else if (newtime + tolerance > time) {
3669 /* close enough undershoot */
3673 } else if (newtime < ltime) {
3674 /* so a position beyond lpos resulted in earlier time than ltime ... */
3675 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3678 /* undershoot too far */
3679 newpos += newpos == lpos ? chunk : 0;
3680 lpos = CLAMP (newpos, lpos, hpos);
3686 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3687 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3692 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3693 gboolean before, GstClockTime * _ts)
3695 gint64 bytes = 0, ts = 0;
3696 GstIndexEntry *entry = NULL;
3698 if (time == GST_CLOCK_TIME_NONE) {
3704 GST_BASE_PARSE_INDEX_LOCK (parse);
3705 if (parse->priv->index) {
3706 /* Let's check if we have an index entry for that time */
3707 entry = gst_index_get_assoc_entry (parse->priv->index,
3708 parse->priv->index_id,
3709 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3710 GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3714 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3715 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3717 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3718 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3719 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3721 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3722 GST_TIME_ARGS (time));
3725 ts = GST_CLOCK_TIME_NONE;
3728 GST_BASE_PARSE_INDEX_UNLOCK (parse);
3737 /* returns TRUE if seek succeeded */
3739 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3744 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3745 gboolean flush, update, res = TRUE, accurate;
3746 gint64 cur, stop, seekpos, seekstop;
3747 GstSegment seeksegment = { 0, };
3748 GstClockTime start_ts;
3750 gst_event_parse_seek (event, &rate, &format, &flags,
3751 &cur_type, &cur, &stop_type, &stop);
3753 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3754 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3755 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3756 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3758 /* no negative rates in push mode */
3759 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
3762 if (cur_type != GST_SEEK_TYPE_SET ||
3763 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3766 /* For any format other than TIME, see if upstream handles
3767 * it directly or fail. For TIME, try upstream, but do it ourselves if
3768 * it fails upstream */
3769 if (format != GST_FORMAT_TIME) {
3770 /* default action delegates to upstream */
3774 gst_event_ref (event);
3775 if ((res = gst_pad_push_event (parse->sinkpad, event))) {
3780 /* get flush flag */
3781 flush = flags & GST_SEEK_FLAG_FLUSH;
3783 /* copy segment, we need this because we still need the old
3784 * segment when we close the current segment. */
3785 gst_segment_copy_into (&parse->segment, &seeksegment);
3787 GST_DEBUG_OBJECT (parse, "configuring seek");
3788 gst_segment_do_seek (&seeksegment, rate, format, flags,
3789 cur_type, cur, stop_type, stop, &update);
3791 /* accurate seeking implies seek tables are used to obtain position,
3792 * and the requested segment is maintained exactly, not adjusted any way */
3793 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3795 /* maybe we can be accurate for (almost) free */
3796 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
3797 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
3798 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3802 GstClockTime startpos = seeksegment.position;
3804 /* accurate requested, so ... seek a bit before target */
3805 if (startpos < parse->priv->lead_in_ts)
3808 startpos -= parse->priv->lead_in_ts;
3809 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3810 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3813 start_ts = seeksegment.position;
3814 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.position,
3815 GST_FORMAT_BYTES, &seekpos))
3816 goto convert_failed;
3817 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3818 GST_FORMAT_BYTES, &seekstop))
3819 goto convert_failed;
3822 GST_DEBUG_OBJECT (parse,
3823 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3825 GST_DEBUG_OBJECT (parse,
3826 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3827 seeksegment.stop, seekstop);
3829 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
3832 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3835 if (parse->srcpad) {
3836 GST_DEBUG_OBJECT (parse, "sending flush start");
3837 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3838 /* unlock upstream pull_range */
3839 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3842 gst_pad_pause_task (parse->sinkpad);
3845 /* we should now be able to grab the streaming thread because we stopped it
3846 * with the above flush/pause code */
3847 GST_PAD_STREAM_LOCK (parse->sinkpad);
3849 /* save current position */
3850 last_stop = parse->segment.position;
3851 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3854 /* now commit to new position */
3856 /* prepare for streaming again */
3858 GST_DEBUG_OBJECT (parse, "sending flush stop");
3859 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop (TRUE));
3860 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop (TRUE));
3861 gst_base_parse_clear_queues (parse);
3863 /* keep track of our position */
3864 seeksegment.base = gst_segment_to_running_time (&seeksegment,
3865 seeksegment.format, parse->segment.position);
3868 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3870 /* store the newsegment event so it can be sent from the streaming thread. */
3871 if (parse->priv->pending_segment)
3872 gst_event_unref (parse->priv->pending_segment);
3874 /* This will be sent later in _loop() */
3875 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
3877 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3878 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3879 ", pos = %" GST_TIME_FORMAT, format,
3880 GST_TIME_ARGS (parse->segment.start),
3881 GST_TIME_ARGS (parse->segment.stop),
3882 GST_TIME_ARGS (parse->segment.start));
3884 /* one last chance in pull mode to stay accurate;
3885 * maybe scan and subclass can find where to go */
3888 GstClockTime ts = seeksegment.position;
3890 gst_base_parse_locate_time (parse, &ts, &scanpos);
3894 /* running collected index now consists of several intervals,
3895 * so optimized check no longer possible */
3896 parse->priv->index_last_valid = FALSE;
3897 parse->priv->index_last_offset = 0;
3898 parse->priv->index_last_ts = 0;
3902 /* mark discont if we are going to stream from another position. */
3903 if (seekpos != parse->priv->offset) {
3904 GST_DEBUG_OBJECT (parse,
3905 "mark DISCONT, we did a seek to another position");
3906 parse->priv->offset = seekpos;
3907 parse->priv->last_offset = seekpos;
3908 parse->priv->seen_keyframe = FALSE;
3909 parse->priv->discont = TRUE;
3910 parse->priv->next_ts = start_ts;
3911 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3912 parse->priv->sync_offset = seekpos;
3913 parse->priv->exact_position = accurate;
3916 /* Start streaming thread if paused */
3917 gst_pad_start_task (parse->sinkpad,
3918 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3920 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3925 GstEvent *new_event;
3926 GstBaseParseSeek *seek;
3927 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
3929 /* The only thing we need to do in PUSH-mode is to send the
3930 seek event (in bytes) to upstream. Segment / flush handling happens
3931 in corresponding src event handlers */
3932 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3933 if (seekstop >= 0 && seekstop <= seekpos)
3935 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
3936 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3938 /* store segment info so its precise details can be reconstructed when
3939 * receiving newsegment;
3940 * this matters for all details when accurate seeking,
3941 * is most useful to preserve NONE stop time otherwise */
3942 seek = g_new0 (GstBaseParseSeek, 1);
3943 seek->segment = seeksegment;
3944 seek->accurate = accurate;
3945 seek->offset = seekpos;
3946 seek->start_ts = start_ts;
3947 GST_OBJECT_LOCK (parse);
3948 /* less optimal, but preserves order */
3949 parse->priv->pending_seeks =
3950 g_slist_append (parse->priv->pending_seeks, seek);
3951 GST_OBJECT_UNLOCK (parse);
3953 res = gst_pad_push_event (parse->sinkpad, new_event);
3956 GST_OBJECT_LOCK (parse);
3957 parse->priv->pending_seeks =
3958 g_slist_remove (parse->priv->pending_seeks, seek);
3959 GST_OBJECT_UNLOCK (parse);
3965 /* handled event is ours to free */
3967 gst_event_unref (event);
3973 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
3979 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
3985 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
3991 /* Checks if bitrates are available from upstream tags so that we don't
3992 * override them later
3995 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
3997 GstTagList *taglist = NULL;
4000 gst_event_parse_tag (event, &taglist);
4002 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
4003 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
4004 parse->priv->post_min_bitrate = FALSE;
4006 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
4007 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
4008 parse->priv->post_avg_bitrate = FALSE;
4010 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
4011 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
4012 parse->priv->post_max_bitrate = FALSE;
4018 gst_base_parse_set_index (GstElement * element, GstIndex * index)
4020 GstBaseParse *parse = GST_BASE_PARSE (element);
4022 GST_BASE_PARSE_INDEX_LOCK (parse);
4023 if (parse->priv->index)
4024 gst_object_unref (parse->priv->index);
4026 parse->priv->index = gst_object_ref (index);
4027 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4028 &parse->priv->index_id);
4029 parse->priv->own_index = FALSE;
4031 parse->priv->index = NULL;
4033 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4037 gst_base_parse_get_index (GstElement * element)
4039 GstBaseParse *parse = GST_BASE_PARSE (element);
4040 GstIndex *result = NULL;
4042 GST_BASE_PARSE_INDEX_LOCK (parse);
4043 if (parse->priv->index)
4044 result = gst_object_ref (parse->priv->index);
4045 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4051 static GstStateChangeReturn
4052 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4054 GstBaseParse *parse;
4055 GstStateChangeReturn result;
4057 parse = GST_BASE_PARSE (element);
4059 switch (transition) {
4060 case GST_STATE_CHANGE_READY_TO_PAUSED:
4061 /* If this is our own index destroy it as the
4062 * old entries might be wrong for the new stream */
4063 GST_BASE_PARSE_INDEX_LOCK (parse);
4064 if (parse->priv->own_index) {
4065 gst_object_unref (parse->priv->index);
4066 parse->priv->index = NULL;
4067 parse->priv->own_index = FALSE;
4070 /* If no index was created, generate one */
4071 if (G_UNLIKELY (!parse->priv->index)) {
4072 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4074 parse->priv->index = g_object_new (gst_mem_index_get_type (), NULL);
4075 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4076 &parse->priv->index_id);
4077 parse->priv->own_index = TRUE;
4079 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4085 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4087 switch (transition) {
4088 case GST_STATE_CHANGE_PAUSED_TO_READY:
4089 gst_base_parse_reset (parse);