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>.
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
23 * SECTION:gstbaseparse
24 * @short_description: Base class for stream parsers
25 * @see_also: #GstBaseTransform
27 * This base class is for parser elements that process data and splits it
28 * into separate audio/video/whatever frames.
32 * <listitem><para>provides one sink pad and one source pad</para></listitem>
33 * <listitem><para>handles state changes</para></listitem>
34 * <listitem><para>can operate in pull mode or push mode</para></listitem>
35 * <listitem><para>handles seeking in both modes</para></listitem>
36 * <listitem><para>handles events (NEWSEGMENT/EOS/FLUSH)</para></listitem>
38 * handles queries (POSITION/DURATION/SEEKING/FORMAT/CONVERT)
40 * <listitem><para>handles flushing</para></listitem>
43 * The purpose of this base class is to provide the basic functionality of
44 * a parser and share a lot of rather complex code.
46 * Description of the parsing mechanism:
49 * <itemizedlist><title>Set-up phase</title>
51 * GstBaseParse class calls @set_sink_caps to inform the subclass about
52 * incoming sinkpad caps. Subclass should set the srcpad caps accordingly.
55 * GstBaseParse calls @start to inform subclass that data processing is
59 * At least at this point subclass needs to tell the GstBaseParse class
60 * how big data chunks it wants to receive (min_frame_size). It can do
61 * this with gst_base_parse_set_min_frame_size().
64 * GstBaseParse class sets up appropriate data passing mode (pull/push)
65 * and starts to process the data.
71 * <title>Parsing phase</title>
73 * GstBaseParse gathers at least min_frame_size bytes of data either
74 * by pulling it from upstream or collecting buffers in an internal
78 * A buffer of (at least) min_frame_size bytes is passed to subclass with
79 * @check_valid_frame. Subclass checks the contents and returns TRUE
80 * if the buffer contains a valid frame. It also needs to set the
81 * @framesize according to the detected frame size. If buffer didn't
82 * contain a valid frame, this call must return FALSE and optionally
83 * set the @skipsize value to inform base class that how many bytes
84 * it needs to skip in order to find a valid frame. @framesize can always
85 * indicate a new minimum for current frame parsing. The passed buffer
86 * is read-only. Note that @check_valid_frame might receive any small
87 * amount of input data when leftover data is being drained (e.g. at EOS).
90 * After valid frame is found, it will be passed again to subclass with
91 * @parse_frame call. Now subclass is responsible for parsing the
92 * frame contents and setting the caps, and buffer metadata (e.g.
93 * buffer timestamp and duration, or keyframe if applicable).
94 * (although the latter can also be done by GstBaseParse if it is
95 * appropriately configured, see below). Frame is provided with
96 * timestamp derived from upstream (as much as generally possible),
97 * duration obtained from configuration (see below), and offset
98 * if meaningful (in pull mode).
101 * Finally the buffer can be pushed downstream and the parsing loop starts
102 * over again. Just prior to actually pushing the buffer in question,
103 * it is passed to @pre_push_buffer which gives subclass yet one
104 * last chance to examine buffer metadata, or to send some custom (tag)
105 * events, or to perform custom (segment) filtering.
108 * During the parsing process GstBaseParseClass will handle both srcpad
109 * and sinkpad events. They will be passed to subclass if @event or
110 * @src_event callbacks have been provided.
115 * <itemizedlist><title>Shutdown phase</title>
117 * GstBaseParse class calls @stop to inform the subclass that data
118 * parsing will be stopped.
124 * Subclass is responsible for providing pad template caps for
125 * source and sink pads. The pads need to be named "sink" and "src". It also
126 * needs to set the fixed caps on srcpad, when the format is ensured (e.g.
127 * when base class calls subclass' @set_sink_caps function).
129 * This base class uses #GST_FORMAT_DEFAULT as a meaning of frames. So,
130 * subclass conversion routine needs to know that conversion from
131 * #GST_FORMAT_TIME to #GST_FORMAT_DEFAULT must return the
132 * frame number that can be found from the given byte position.
134 * GstBaseParse uses subclasses conversion methods also for seeking (or
135 * otherwise uses its own default one, see also below).
137 * Subclass @start and @stop functions will be called to inform the beginning
138 * and end of data processing.
140 * Things that subclass need to take care of:
142 * <listitem><para>Provide pad templates</para></listitem>
144 * Fixate the source pad caps when appropriate
147 * Inform base class how big data chunks should be retrieved. This is
148 * done with gst_base_parse_set_min_frame_size() function.
151 * Examine data chunks passed to subclass with @check_valid_frame
152 * and tell if they contain a valid frame
155 * Set the caps and timestamp to frame that is passed to subclass with
156 * @parse_frame function.
158 * <listitem><para>Provide conversion functions</para></listitem>
160 * Update the duration information with gst_base_parse_set_duration()
163 * Optionally passthrough using gst_base_parse_set_passthrough()
166 * Configure various baseparse parameters using
167 * gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
168 * and gst_base_parse_set_frame_rate().
171 * In particular, if subclass is unable to determine a duration, but
172 * parsing (or specs) yields a frames per seconds rate, then this can be
173 * provided to GstBaseParse to enable it to cater for
174 * buffer time metadata (which will be taken from upstream as much as
175 * possible). Internally keeping track of frame durations and respective
176 * sizes that have been pushed provides GstBaseParse with an estimated
177 * bitrate. A default @convert (used if not overriden) will then use these
178 * rates to perform obvious conversions. These rates are also used to
179 * update (estimated) duration at regular frame intervals.
186 * - In push mode provide a queue of adapter-"queued" buffers for upstream
188 * - Queue buffers/events until caps are set
198 #include <gst/base/gstadapter.h>
200 #include "gstbaseparse.h"
202 #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
204 #define MIN_FRAMES_TO_POST_BITRATE 10
205 #define TARGET_DIFFERENCE (20 * GST_SECOND)
207 GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
208 #define GST_CAT_DEFAULT gst_base_parse_debug
210 /* Supported formats */
211 static GstFormat fmtlist[] = {
218 #define GST_BASE_PARSE_GET_PRIVATE(obj) \
219 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
221 struct _GstBaseParsePrivate
223 GstActivateMode pad_mode;
228 GstFormat duration_fmt;
229 gint64 estimated_duration;
231 guint min_frame_size;
232 gboolean passthrough;
234 gboolean has_timing_info;
235 guint fps_num, fps_den;
236 gint update_interval;
238 guint lead_in, lead_out;
239 GstClockTime lead_in_ts, lead_out_ts;
247 GstClockTime next_ts;
248 GstClockTime prev_ts;
249 GstClockTime frame_duration;
250 gboolean seen_keyframe;
255 guint64 data_bytecount;
256 guint64 acc_duration;
257 GstClockTime first_frame_ts;
258 gint64 first_frame_offset;
260 gboolean post_min_bitrate;
261 gboolean post_avg_bitrate;
262 gboolean post_max_bitrate;
266 guint posted_avg_bitrate;
268 GList *pending_events;
270 /* frames/buffers that are queued and ready to go on OK */
271 GQueue queued_frames;
275 /* index entry storage, either ours or provided */
279 /* seek table entries only maintained if upstream is BYTE seekable */
280 gboolean upstream_seekable;
281 gboolean upstream_has_duration;
282 gint64 upstream_size;
283 /* minimum distance between two index entries */
284 GstClockTimeDiff idx_interval;
285 /* ts and offset of last entry added */
286 GstClockTime index_last_ts;
287 gint64 index_last_offset;
288 gboolean index_last_valid;
290 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
291 gboolean exact_position;
292 /* seek events are temporarily kept to match them with newsegments */
293 GSList *pending_seeks;
295 /* reverse playback */
296 GSList *buffers_pending;
297 GSList *buffers_queued;
298 GSList *buffers_send;
299 GstClockTime last_ts;
302 /* Newsegment event to be sent after SEEK */
303 GstEvent *pending_segment;
305 /* Segment event that closes the running segment prior to SEEK */
306 GstEvent *close_segment;
309 typedef struct _GstBaseParseSeek
314 GstClockTime start_ts;
317 static GstElementClass *parent_class = NULL;
319 static void gst_base_parse_class_init (GstBaseParseClass * klass);
320 static void gst_base_parse_init (GstBaseParse * parse,
321 GstBaseParseClass * klass);
324 gst_base_parse_get_type (void)
326 static volatile gsize base_parse_type = 0;
328 if (g_once_init_enter (&base_parse_type)) {
329 static const GTypeInfo base_parse_info = {
330 sizeof (GstBaseParseClass),
331 (GBaseInitFunc) NULL,
332 (GBaseFinalizeFunc) NULL,
333 (GClassInitFunc) gst_base_parse_class_init,
336 sizeof (GstBaseParse),
338 (GInstanceInitFunc) gst_base_parse_init,
342 _type = g_type_register_static (GST_TYPE_ELEMENT,
343 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
344 g_once_init_leave (&base_parse_type, _type);
346 return (GType) base_parse_type;
349 static void gst_base_parse_finalize (GObject * object);
351 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
352 GstStateChange transition);
353 static void gst_base_parse_reset (GstBaseParse * parse);
355 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
356 static GstIndex *gst_base_parse_get_index (GstElement * element);
358 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad);
359 static gboolean gst_base_parse_sink_activate_push (GstPad * pad,
361 static gboolean gst_base_parse_sink_activate_pull (GstPad * pad,
363 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
365 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
367 static gboolean gst_base_parse_src_event (GstPad * pad, GstEvent * event);
368 static gboolean gst_base_parse_sink_event (GstPad * pad, GstEvent * event);
369 static gboolean gst_base_parse_query (GstPad * pad, GstQuery * query);
370 static gboolean gst_base_parse_sink_setcaps (GstPad * pad, GstCaps * caps);
371 static const GstQueryType *gst_base_parse_get_querytypes (GstPad * pad);
373 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstBuffer * buffer);
374 static void gst_base_parse_loop (GstPad * pad);
376 static gboolean gst_base_parse_check_frame (GstBaseParse * parse,
377 GstBaseParseFrame * frame, guint * framesize, gint * skipsize);
378 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
379 GstBaseParseFrame * frame);
381 static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse,
384 static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse,
387 static void gst_base_parse_drain (GstBaseParse * parse);
389 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
390 gboolean post_min, gboolean post_avg, gboolean post_max);
392 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
393 GstClockTime time, gboolean before, GstClockTime * _ts);
394 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
395 GstClockTime * _time, gint64 * _offset);
397 static GstFlowReturn gst_base_parse_process_fragment (GstBaseParse * parse,
400 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
403 gst_base_parse_clear_queues (GstBaseParse * parse)
405 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
406 g_slist_free (parse->priv->buffers_queued);
407 parse->priv->buffers_queued = NULL;
408 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
410 g_slist_free (parse->priv->buffers_pending);
411 parse->priv->buffers_pending = NULL;
412 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
413 g_slist_free (parse->priv->buffers_send);
414 parse->priv->buffers_send = NULL;
418 gst_base_parse_finalize (GObject * object)
420 GstBaseParse *parse = GST_BASE_PARSE (object);
423 g_object_unref (parse->priv->adapter);
425 if (parse->priv->pending_segment) {
426 p_ev = &parse->priv->pending_segment;
427 gst_event_replace (p_ev, NULL);
429 if (parse->priv->close_segment) {
430 p_ev = &parse->priv->close_segment;
431 gst_event_replace (p_ev, NULL);
434 if (parse->priv->cache) {
435 gst_buffer_unref (parse->priv->cache);
436 parse->priv->cache = NULL;
439 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
441 g_list_free (parse->priv->pending_events);
442 parse->priv->pending_events = NULL;
444 g_queue_foreach (&parse->priv->queued_frames,
445 (GFunc) gst_base_parse_frame_free, NULL);
446 g_queue_clear (&parse->priv->queued_frames);
448 if (parse->priv->index) {
449 gst_object_unref (parse->priv->index);
450 parse->priv->index = NULL;
453 gst_base_parse_clear_queues (parse);
455 G_OBJECT_CLASS (parent_class)->finalize (object);
459 gst_base_parse_class_init (GstBaseParseClass * klass)
461 GObjectClass *gobject_class;
462 GstElementClass *gstelement_class;
464 gobject_class = G_OBJECT_CLASS (klass);
465 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
466 parent_class = g_type_class_peek_parent (klass);
467 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
469 gstelement_class = (GstElementClass *) klass;
470 gstelement_class->change_state =
471 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
472 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
473 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
475 /* Default handlers */
476 klass->check_valid_frame = gst_base_parse_check_frame;
477 klass->parse_frame = gst_base_parse_parse_frame;
478 klass->src_event = gst_base_parse_src_eventfunc;
479 klass->convert = gst_base_parse_convert_default;
481 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
482 "baseparse element");
486 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
488 GstPadTemplate *pad_template;
490 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
492 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
495 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
496 g_return_if_fail (pad_template != NULL);
497 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
498 gst_pad_set_event_function (parse->sinkpad,
499 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
500 gst_pad_set_setcaps_function (parse->sinkpad,
501 GST_DEBUG_FUNCPTR (gst_base_parse_sink_setcaps));
502 gst_pad_set_chain_function (parse->sinkpad,
503 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
504 gst_pad_set_activate_function (parse->sinkpad,
505 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
506 gst_pad_set_activatepush_function (parse->sinkpad,
507 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_push));
508 gst_pad_set_activatepull_function (parse->sinkpad,
509 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_pull));
510 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
512 GST_DEBUG_OBJECT (parse, "sinkpad created");
515 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
516 g_return_if_fail (pad_template != NULL);
517 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
518 gst_pad_set_event_function (parse->srcpad,
519 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
520 gst_pad_set_query_type_function (parse->srcpad,
521 GST_DEBUG_FUNCPTR (gst_base_parse_get_querytypes));
522 gst_pad_set_query_function (parse->srcpad,
523 GST_DEBUG_FUNCPTR (gst_base_parse_query));
524 gst_pad_use_fixed_caps (parse->srcpad);
525 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
526 GST_DEBUG_OBJECT (parse, "src created");
528 g_queue_init (&parse->priv->queued_frames);
530 parse->priv->adapter = gst_adapter_new ();
532 parse->priv->pad_mode = GST_ACTIVATE_NONE;
535 gst_base_parse_reset (parse);
536 GST_DEBUG_OBJECT (parse, "init ok");
539 static GstBaseParseFrame *
540 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
542 GstBaseParseFrame *copy;
544 copy = g_slice_dup (GstBaseParseFrame, frame);
545 copy->buffer = gst_buffer_ref (frame->buffer);
546 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
548 GST_TRACE ("copied frame %p -> %p", frame, copy);
554 gst_base_parse_frame_free (GstBaseParseFrame * frame)
556 GST_TRACE ("freeing frame %p", frame);
559 gst_buffer_unref (frame->buffer);
560 frame->buffer = NULL;
563 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC))
564 g_slice_free (GstBaseParseFrame, frame);
568 gst_base_parse_frame_get_type (void)
570 static volatile gsize frame_type = 0;
572 if (g_once_init_enter (&frame_type)) {
575 _type = g_boxed_type_register_static ("GstBaseParseFrame",
576 (GBoxedCopyFunc) gst_base_parse_frame_copy,
577 (GBoxedFreeFunc) gst_base_parse_frame_free);
578 g_once_init_leave (&frame_type, _type);
580 return (GType) frame_type;
584 * gst_base_parse_frame_init:
585 * @frame: #GstBaseParseFrame.
587 * Sets a #GstBaseParseFrame to initial state. Currently this means
588 * all public fields are zero-ed and a private flag is set to make
589 * sure gst_base_parse_frame_free() only frees the contents but not
590 * the actual frame. Use this function to initialise a #GstBaseParseFrame
591 * allocated on the stack.
596 gst_base_parse_frame_init (GstBaseParseFrame * frame)
598 memset (frame, 0, sizeof (GstBaseParseFrame));
599 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
600 GST_TRACE ("inited frame %p", frame);
604 * gst_base_parse_frame_new:
605 * @buffer: (transfer none): a #GstBuffer
607 * @overhead: number of bytes in this frame which should be counted as
608 * metadata overhead, ie. not used to calculate the average bitrate.
609 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
611 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
612 * elements written in C should usually allocate the frame on the stack and
613 * then use gst_base_parse_frame_init() to initialise it.
615 * Returns: a newly-allocated #GstBaseParseFrame. Free with
616 * gst_base_parse_frame_free() when no longer needed, unless you gave
617 * away ownership to gst_base_parse_push_frame().
622 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
625 GstBaseParseFrame *frame;
627 frame = g_slice_new0 (GstBaseParseFrame);
628 frame->buffer = gst_buffer_ref (buffer);
630 GST_TRACE ("created frame %p", frame);
635 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
638 gst_buffer_replace (&frame->buffer, buf);
642 /* set flags one by one for clarity */
643 if (G_UNLIKELY (parse->priv->drain))
644 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
646 /* losing sync is pretty much a discont (and vice versa), no ? */
647 if (G_UNLIKELY (parse->priv->discont))
648 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
652 gst_base_parse_reset (GstBaseParse * parse)
654 GST_OBJECT_LOCK (parse);
655 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
656 parse->priv->duration = -1;
657 parse->priv->min_frame_size = 1;
658 parse->priv->discont = TRUE;
659 parse->priv->flushing = FALSE;
660 parse->priv->offset = 0;
661 parse->priv->sync_offset = 0;
662 parse->priv->update_interval = -1;
663 parse->priv->fps_num = parse->priv->fps_den = 0;
664 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
665 parse->priv->lead_in = parse->priv->lead_out = 0;
666 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
667 parse->priv->bitrate = 0;
668 parse->priv->framecount = 0;
669 parse->priv->bytecount = 0;
670 parse->priv->acc_duration = 0;
671 parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE;
672 parse->priv->first_frame_offset = -1;
673 parse->priv->estimated_duration = -1;
674 parse->priv->next_ts = 0;
675 parse->priv->syncable = TRUE;
676 parse->priv->passthrough = FALSE;
677 parse->priv->has_timing_info = FALSE;
678 parse->priv->post_min_bitrate = TRUE;
679 parse->priv->post_avg_bitrate = TRUE;
680 parse->priv->post_max_bitrate = TRUE;
681 parse->priv->min_bitrate = G_MAXUINT;
682 parse->priv->max_bitrate = 0;
683 parse->priv->avg_bitrate = 0;
684 parse->priv->posted_avg_bitrate = 0;
686 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
687 parse->priv->index_last_offset = -1;
688 parse->priv->index_last_valid = TRUE;
689 parse->priv->upstream_seekable = FALSE;
690 parse->priv->upstream_size = 0;
691 parse->priv->upstream_has_duration = FALSE;
692 parse->priv->idx_interval = 0;
693 parse->priv->exact_position = TRUE;
694 parse->priv->seen_keyframe = FALSE;
696 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
697 parse->priv->last_offset = 0;
699 if (parse->priv->pending_segment) {
700 gst_event_unref (parse->priv->pending_segment);
701 parse->priv->pending_segment = NULL;
704 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
706 g_list_free (parse->priv->pending_events);
707 parse->priv->pending_events = NULL;
709 if (parse->priv->cache) {
710 gst_buffer_unref (parse->priv->cache);
711 parse->priv->cache = NULL;
714 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
715 g_slist_free (parse->priv->pending_seeks);
716 parse->priv->pending_seeks = NULL;
717 GST_OBJECT_UNLOCK (parse);
720 /* gst_base_parse_check_frame:
721 * @parse: #GstBaseParse.
722 * @buffer: GstBuffer.
723 * @framesize: This will be set to tell the found frame size in bytes.
724 * @skipsize: Output parameter that tells how much data needs to be skipped
725 * in order to find the following frame header.
727 * Default callback for check_valid_frame.
729 * Returns: Always TRUE.
732 gst_base_parse_check_frame (GstBaseParse * parse,
733 GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
735 *framesize = gst_buffer_get_size (frame->buffer);
741 /* gst_base_parse_parse_frame:
742 * @parse: #GstBaseParse.
743 * @buffer: #GstBuffer.
745 * Default callback for parse_frame.
748 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
750 GstBuffer *buffer = frame->buffer;
752 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
753 GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) {
754 GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts;
756 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
757 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
758 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
763 /* gst_base_parse_convert:
764 * @parse: #GstBaseParse.
765 * @src_format: #GstFormat describing the source format.
766 * @src_value: Source value to be converted.
767 * @dest_format: #GstFormat defining the converted format.
768 * @dest_value: Pointer where the conversion result will be put.
770 * Converts using configured "convert" vmethod in #GstBaseParse class.
772 * Returns: TRUE if conversion was successful.
775 gst_base_parse_convert (GstBaseParse * parse,
776 GstFormat src_format,
777 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
779 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
782 g_return_val_if_fail (dest_value != NULL, FALSE);
787 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
789 #ifndef GST_DISABLE_GST_DEBUG
792 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
793 GST_LOG_OBJECT (parse,
794 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
795 GST_TIME_ARGS (src_value), *dest_value);
796 } else if (dest_format == GST_FORMAT_TIME &&
797 src_format == GST_FORMAT_BYTES) {
798 GST_LOG_OBJECT (parse,
799 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
800 src_value, GST_TIME_ARGS (*dest_value));
802 GST_LOG_OBJECT (parse,
803 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
804 GST_STR_NULL (gst_format_get_name (src_format)),
805 GST_STR_NULL (gst_format_get_name (dest_format)),
806 src_value, *dest_value);
809 GST_DEBUG_OBJECT (parse, "conversion failed");
817 /* gst_base_parse_sink_event:
818 * @pad: #GstPad that received the event.
819 * @event: #GstEvent to be handled.
821 * Handler for sink pad events.
823 * Returns: TRUE if the event was handled.
826 gst_base_parse_sink_event (GstPad * pad, GstEvent * event)
829 GstBaseParseClass *bclass;
830 gboolean handled = FALSE;
833 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
834 bclass = GST_BASE_PARSE_GET_CLASS (parse);
836 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
837 GST_EVENT_TYPE_NAME (event));
839 /* Cache all events except EOS, NEWSEGMENT and FLUSH_STOP if we have a
841 if (parse->priv->pending_segment && GST_EVENT_TYPE (event) != GST_EVENT_EOS
842 && GST_EVENT_TYPE (event) != GST_EVENT_NEWSEGMENT
843 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
844 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP) {
846 if (GST_EVENT_TYPE (event) == GST_EVENT_TAG)
847 /* See if any bitrate tags were posted */
848 gst_base_parse_handle_tag (parse, event);
850 parse->priv->pending_events =
851 g_list_append (parse->priv->pending_events, event);
855 if (GST_EVENT_TYPE (event) == GST_EVENT_EOS &&
856 parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
857 /* We've not posted bitrate tags yet - do so now */
858 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
861 handled = bclass->event (parse, event);
864 handled = gst_base_parse_sink_eventfunc (parse, event);
867 ret = gst_pad_event_default (pad, event);
870 gst_object_unref (parse);
871 GST_DEBUG_OBJECT (parse, "event handled");
876 /* gst_base_parse_sink_eventfunc:
877 * @parse: #GstBaseParse.
878 * @event: #GstEvent to be handled.
880 * Element-level event handler function.
882 * The event will be unreffed only if it has been handled and this
883 * function returns %TRUE
885 * Returns: %TRUE if the event was handled and not need forwarding.
888 gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event)
890 gboolean handled = FALSE;
893 switch (GST_EVENT_TYPE (event)) {
894 case GST_EVENT_NEWSEGMENT:
896 gdouble rate, applied_rate;
898 gint64 start, stop, pos, next_ts, offset = 0;
901 gst_event_parse_new_segment_full (event, &update, &rate, &applied_rate,
902 &format, &start, &stop, &pos);
904 GST_DEBUG_OBJECT (parse, "newseg rate %g, applied rate %g, "
905 "format %d, start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
906 ", pos = %" GST_TIME_FORMAT, rate, applied_rate, format,
907 GST_TIME_ARGS (start), GST_TIME_ARGS (stop), GST_TIME_ARGS (pos));
909 if (format == GST_FORMAT_BYTES) {
910 GstClockTime seg_start, seg_stop;
911 GstBaseParseSeek *seek = NULL;
914 /* stop time is allowed to be open-ended, but not start & pos */
915 seg_stop = GST_CLOCK_TIME_NONE;
919 GST_OBJECT_LOCK (parse);
920 for (node = parse->priv->pending_seeks; node; node = node->next) {
921 GstBaseParseSeek *tmp = node->data;
923 if (tmp->offset == pos) {
928 parse->priv->pending_seeks =
929 g_slist_remove (parse->priv->pending_seeks, seek);
930 GST_OBJECT_UNLOCK (parse);
933 GST_DEBUG_OBJECT (parse,
934 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
935 seek->accurate ? " accurate" : "", &seek->segment);
936 seg_start = seek->segment.start;
937 seg_stop = seek->segment.stop;
938 next_ts = seek->start_ts;
939 parse->priv->exact_position = seek->accurate;
942 /* best attempt convert */
943 /* as these are only estimates, stop is kept open-ended to avoid
944 * premature cutting */
945 gst_base_parse_convert (parse, GST_FORMAT_BYTES, start,
946 GST_FORMAT_TIME, (gint64 *) & seg_start);
947 parse->priv->exact_position = (start == 0);
951 gst_event_unref (event);
952 event = gst_event_new_new_segment_full (update, rate, applied_rate,
953 GST_FORMAT_TIME, seg_start, seg_stop, seg_start);
954 format = GST_FORMAT_TIME;
957 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. "
958 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT,
959 GST_TIME_ARGS (seg_start), GST_TIME_ARGS (seg_stop));
960 } else if (format != GST_FORMAT_TIME) {
961 /* Unknown incoming segment format. Output a default open-ended
963 gst_event_unref (event);
964 event = gst_event_new_new_segment_full (update, rate, applied_rate,
965 GST_FORMAT_TIME, 0, GST_CLOCK_TIME_NONE, 0);
966 format = GST_FORMAT_TIME;
968 stop = GST_CLOCK_TIME_NONE;
970 /* not considered BYTE seekable if it is talking to us in TIME,
971 * whatever else it might claim */
972 parse->priv->upstream_seekable = FALSE;
976 gst_segment_set_newsegment_full (&parse->segment, update, rate,
977 applied_rate, format, start, stop, start);
979 /* save the segment for later, right before we push a new buffer so that
980 * the caps are fixed and the next linked element can receive
982 eventp = &parse->priv->pending_segment;
983 gst_event_replace (eventp, event);
984 gst_event_unref (event);
987 /* but finish the current segment */
988 GST_DEBUG_OBJECT (parse, "draining current segment");
989 if (parse->segment.rate > 0.0)
990 gst_base_parse_drain (parse);
992 gst_base_parse_process_fragment (parse, FALSE);
993 gst_adapter_clear (parse->priv->adapter);
994 parse->priv->offset = offset;
995 parse->priv->sync_offset = offset;
996 parse->priv->next_ts = next_ts;
997 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
998 parse->priv->discont = TRUE;
999 parse->priv->seen_keyframe = FALSE;
1003 case GST_EVENT_FLUSH_START:
1004 parse->priv->flushing = TRUE;
1005 handled = gst_pad_push_event (parse->srcpad, gst_event_ref (event));
1007 gst_event_unref (event);
1008 /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
1009 GST_PAD_STREAM_LOCK (parse->srcpad);
1010 GST_PAD_STREAM_UNLOCK (parse->srcpad);
1014 case GST_EVENT_FLUSH_STOP:
1015 gst_adapter_clear (parse->priv->adapter);
1016 gst_base_parse_clear_queues (parse);
1017 parse->priv->flushing = FALSE;
1018 parse->priv->discont = TRUE;
1019 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1023 if (parse->segment.rate > 0.0)
1024 gst_base_parse_drain (parse);
1026 gst_base_parse_process_fragment (parse, FALSE);
1028 /* If we STILL have zero frames processed, fire an error */
1029 if (parse->priv->framecount == 0) {
1030 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1031 ("No valid frames found before end of stream"), (NULL));
1033 /* newsegment before eos */
1034 if (parse->priv->pending_segment) {
1035 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
1036 parse->priv->pending_segment = NULL;
1048 /* gst_base_parse_src_event:
1049 * @pad: #GstPad that received the event.
1050 * @event: #GstEvent that was received.
1052 * Handler for source pad events.
1054 * Returns: TRUE if the event was handled.
1057 gst_base_parse_src_event (GstPad * pad, GstEvent * event)
1059 GstBaseParse *parse;
1060 GstBaseParseClass *bclass;
1061 gboolean handled = FALSE;
1062 gboolean ret = TRUE;
1064 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
1065 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1067 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1068 GST_EVENT_TYPE_NAME (event));
1070 if (bclass->src_event)
1071 handled = bclass->src_event (parse, event);
1074 ret = gst_pad_event_default (pad, event);
1076 gst_object_unref (parse);
1081 gst_base_parse_is_seekable (GstBaseParse * parse)
1083 /* FIXME: could do more here, e.g. check index or just send data from 0
1084 * in pull mode and let decoder/sink clip */
1085 return parse->priv->syncable;
1088 /* gst_base_parse_src_eventfunc:
1089 * @parse: #GstBaseParse.
1090 * @event: #GstEvent that was received.
1092 * Default srcpad event handler.
1094 * Returns: TRUE if the event was handled and can be dropped.
1097 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1099 gboolean handled = FALSE;
1101 switch (GST_EVENT_TYPE (event)) {
1102 case GST_EVENT_SEEK:
1104 if (gst_base_parse_is_seekable (parse)) {
1105 handled = gst_base_parse_handle_seek (parse, event);
1117 * gst_base_parse_convert_default:
1118 * @parse: #GstBaseParse.
1119 * @src_format: #GstFormat describing the source format.
1120 * @src_value: Source value to be converted.
1121 * @dest_format: #GstFormat defining the converted format.
1122 * @dest_value: Pointer where the conversion result will be put.
1124 * Default implementation of "convert" vmethod in #GstBaseParse class.
1126 * Returns: TRUE if conversion was successful.
1131 gst_base_parse_convert_default (GstBaseParse * parse,
1132 GstFormat src_format,
1133 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1135 gboolean ret = FALSE;
1136 guint64 bytes, duration;
1138 if (G_UNLIKELY (src_format == dest_format)) {
1139 *dest_value = src_value;
1143 if (G_UNLIKELY (src_value == -1)) {
1148 if (G_UNLIKELY (src_value == 0)) {
1153 /* need at least some frames */
1154 if (!parse->priv->framecount)
1157 duration = parse->priv->acc_duration / GST_MSECOND;
1158 bytes = parse->priv->bytecount;
1160 if (G_UNLIKELY (!duration || !bytes))
1163 if (src_format == GST_FORMAT_BYTES) {
1164 if (dest_format == GST_FORMAT_TIME) {
1165 /* BYTES -> TIME conversion */
1166 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1167 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1168 *dest_value *= GST_MSECOND;
1169 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1170 *dest_value / GST_MSECOND);
1173 } else if (src_format == GST_FORMAT_TIME) {
1174 if (dest_format == GST_FORMAT_BYTES) {
1175 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1176 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1178 GST_DEBUG_OBJECT (parse,
1179 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1180 src_value / GST_MSECOND, *dest_value);
1183 } else if (src_format == GST_FORMAT_DEFAULT) {
1184 /* DEFAULT == frame-based */
1185 if (dest_format == GST_FORMAT_TIME) {
1186 if (parse->priv->fps_den) {
1187 *dest_value = gst_util_uint64_scale (src_value,
1188 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1191 } else if (dest_format == GST_FORMAT_BYTES) {
1199 gst_base_parse_update_duration (GstBaseParse * baseparse)
1202 GstBaseParse *parse;
1204 parse = GST_BASE_PARSE (baseparse);
1206 peer = gst_pad_get_peer (parse->sinkpad);
1208 GstFormat pformat = GST_FORMAT_BYTES;
1209 gboolean qres = FALSE;
1210 gint64 ptot, dest_value;
1212 qres = gst_pad_query_duration (peer, &pformat, &ptot);
1213 gst_object_unref (GST_OBJECT (peer));
1215 if (gst_base_parse_convert (parse, pformat, ptot,
1216 GST_FORMAT_TIME, &dest_value)) {
1217 parse->priv->estimated_duration = dest_value;
1218 GST_LOG_OBJECT (parse,
1219 "updated estimated duration to %" GST_TIME_FORMAT,
1220 GST_TIME_ARGS (dest_value));
1227 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1228 gboolean post_avg, gboolean post_max)
1230 GstTagList *taglist = gst_tag_list_new ();
1232 if (post_min && parse->priv->post_min_bitrate)
1233 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1234 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1236 if (post_avg && parse->priv->post_avg_bitrate) {
1237 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1238 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1239 parse->priv->avg_bitrate, NULL);
1242 if (post_max && parse->priv->post_max_bitrate)
1243 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1244 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1246 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1247 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1248 parse->priv->max_bitrate);
1250 gst_element_found_tags_for_pad (GST_ELEMENT (parse), parse->srcpad, taglist);
1253 /* gst_base_parse_update_bitrates:
1254 * @parse: #GstBaseParse.
1255 * @buffer: Current frame as a #GstBuffer
1257 * Keeps track of the minimum and maximum bitrates, and also maintains a
1258 * running average bitrate of the stream so far.
1261 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1263 /* Only update the tag on a 10 kbps delta */
1264 static const gint update_threshold = 10000;
1266 guint64 data_len, frame_dur;
1267 gint overhead, frame_bitrate, old_avg_bitrate;
1268 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1269 GstBuffer *buffer = frame->buffer;
1271 overhead = frame->overhead;
1275 data_len = gst_buffer_get_size (buffer) - overhead;
1276 parse->priv->data_bytecount += data_len;
1278 /* duration should be valid by now,
1279 * either set by subclass or maybe based on fps settings */
1280 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1281 /* Calculate duration of a frame from buffer properties */
1282 frame_dur = GST_BUFFER_DURATION (buffer);
1283 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1284 parse->priv->acc_duration;
1287 /* No way to figure out frame duration (is this even possible?) */
1291 /* override if subclass provided bitrate, e.g. metadata based */
1292 if (parse->priv->bitrate) {
1293 parse->priv->avg_bitrate = parse->priv->bitrate;
1294 /* spread this (confirmed) info ASAP */
1295 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1296 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1300 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1304 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1305 parse->priv->avg_bitrate);
1307 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1309 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1310 /* always post all at threshold time */
1311 update_min = update_max = update_avg = TRUE;
1314 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1315 if (frame_bitrate < parse->priv->min_bitrate) {
1316 parse->priv->min_bitrate = frame_bitrate;
1320 if (frame_bitrate > parse->priv->max_bitrate) {
1321 parse->priv->max_bitrate = frame_bitrate;
1325 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1326 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1327 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1332 if ((update_min || update_avg || update_max))
1333 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1335 /* If average bitrate changes that much and no valid (time) duration provided,
1336 * then post a new duration message so applications can update their cached
1338 if (update_avg && !(parse->priv->duration_fmt == GST_FORMAT_TIME &&
1339 GST_CLOCK_TIME_IS_VALID (parse->priv->duration)))
1340 gst_element_post_message (GST_ELEMENT (parse),
1341 gst_message_new_duration (GST_OBJECT (parse), GST_FORMAT_TIME, -1));
1348 * gst_base_parse_add_index_entry:
1349 * @parse: #GstBaseParse.
1350 * @offset: offset of entry
1351 * @ts: timestamp associated with offset
1352 * @key: whether entry refers to keyframe
1353 * @force: add entry disregarding sanity checks
1355 * Adds an entry to the index associating @offset to @ts. It is recommended
1356 * to only add keyframe entries. @force allows to bypass checks, such as
1357 * whether the stream is (upstream) seekable, another entry is already "close"
1358 * to the new entry, etc.
1360 * Returns: #gboolean indicating whether entry was added
1365 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1366 GstClockTime ts, gboolean key, gboolean force)
1368 gboolean ret = FALSE;
1369 GstIndexAssociation associations[2];
1371 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1372 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1374 if (G_LIKELY (!force)) {
1376 if (!parse->priv->upstream_seekable) {
1377 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1381 /* FIXME need better helper data structure that handles these issues
1382 * related to ongoing collecting of index entries */
1383 if (parse->priv->index_last_offset >= (gint64) offset) {
1384 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1385 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1389 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1390 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1391 parse->priv->idx_interval) {
1392 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1393 GST_TIME_ARGS (parse->priv->index_last_ts));
1397 /* if last is not really the last one */
1398 if (!parse->priv->index_last_valid) {
1399 GstClockTime prev_ts;
1401 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1402 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1403 GST_DEBUG_OBJECT (parse,
1404 "entry too close to existing entry %" GST_TIME_FORMAT,
1405 GST_TIME_ARGS (prev_ts));
1406 parse->priv->index_last_offset = offset;
1407 parse->priv->index_last_ts = ts;
1413 associations[0].format = GST_FORMAT_TIME;
1414 associations[0].value = ts;
1415 associations[1].format = GST_FORMAT_BYTES;
1416 associations[1].value = offset;
1418 /* index might change on-the-fly, although that would be nutty app ... */
1419 GST_OBJECT_LOCK (parse);
1420 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1421 (key) ? GST_ASSOCIATION_FLAG_KEY_UNIT : GST_ASSOCIATION_FLAG_DELTA_UNIT,
1422 2, (const GstIndexAssociation *) &associations);
1423 GST_OBJECT_UNLOCK (parse);
1426 parse->priv->index_last_offset = offset;
1427 parse->priv->index_last_ts = ts;
1436 /* check for seekable upstream, above and beyond a mere query */
1438 gst_base_parse_check_seekability (GstBaseParse * parse)
1441 gboolean seekable = FALSE;
1442 gint64 start = -1, stop = -1;
1443 guint idx_interval = 0;
1445 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1446 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1447 GST_DEBUG_OBJECT (parse, "seeking query failed");
1451 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1453 /* try harder to query upstream size if we didn't get it the first time */
1454 if (seekable && stop == -1) {
1455 GstFormat fmt = GST_FORMAT_BYTES;
1457 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1458 gst_pad_query_peer_duration (parse->sinkpad, &fmt, &stop);
1461 /* if upstream doesn't know the size, it's likely that it's not seekable in
1462 * practice even if it technically may be seekable */
1463 if (seekable && (start != 0 || stop <= start)) {
1464 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1468 /* let's not put every single frame into our index */
1470 if (stop < 10 * 1024 * 1024)
1472 else if (stop < 100 * 1024 * 1024)
1475 idx_interval = 1000;
1479 gst_query_unref (query);
1481 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1482 G_GUINT64_FORMAT ")", seekable, start, stop);
1483 parse->priv->upstream_seekable = seekable;
1484 parse->priv->upstream_size = seekable ? stop : 0;
1486 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1487 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1490 /* some misc checks on upstream */
1492 gst_base_parse_check_upstream (GstBaseParse * parse)
1494 GstFormat fmt = GST_FORMAT_TIME;
1497 if (gst_pad_query_peer_duration (parse->sinkpad, &fmt, &stop))
1498 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1499 /* upstream has one, accept it also, and no further updates */
1500 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1501 parse->priv->upstream_has_duration = TRUE;
1504 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1505 parse->priv->upstream_has_duration);
1508 /* checks src caps to determine if dealing with audio or video */
1509 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1511 gst_base_parse_check_media (GstBaseParse * parse)
1516 caps = GST_PAD_CAPS (parse->srcpad);
1517 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1518 parse->priv->is_video =
1519 g_str_has_prefix (gst_structure_get_name (s), "video");
1521 /* historical default */
1522 parse->priv->is_video = FALSE;
1525 GST_DEBUG_OBJECT (parse, "media is video == %d", parse->priv->is_video);
1528 /* takes ownership of frame */
1530 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1532 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1533 /* frame allocated on the heap, we can just take ownership */
1534 g_queue_push_tail (&parse->priv->queued_frames, frame);
1535 GST_TRACE ("queued frame %p", frame);
1537 GstBaseParseFrame *copy;
1539 /* probably allocated on the stack, must make a proper copy */
1540 copy = gst_base_parse_frame_copy (frame);
1541 g_queue_push_tail (&parse->priv->queued_frames, copy);
1542 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1543 gst_base_parse_frame_free (frame);
1547 /* gst_base_parse_handle_and_push_buffer:
1548 * @parse: #GstBaseParse.
1549 * @klass: #GstBaseParseClass.
1550 * @frame: (transfer full): a #GstBaseParseFrame
1552 * Parses the frame from given buffer and pushes it forward. Also performs
1553 * timestamp handling and checks the segment limits.
1555 * This is called with srcpad STREAM_LOCK held.
1557 * Returns: #GstFlowReturn
1559 static GstFlowReturn
1560 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1561 GstBaseParseClass * klass, GstBaseParseFrame * frame)
1567 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1569 buffer = frame->buffer;
1571 if (parse->priv->discont) {
1572 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1573 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1574 parse->priv->discont = FALSE;
1577 /* some one-time start-up */
1578 if (G_UNLIKELY (!parse->priv->framecount)) {
1579 gst_base_parse_check_seekability (parse);
1580 gst_base_parse_check_upstream (parse);
1583 GST_LOG_OBJECT (parse,
1584 "parsing frame at offset %" G_GUINT64_FORMAT
1585 " (%#" G_GINT64_MODIFIER "x) of size %d",
1586 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1587 gst_buffer_get_size (buffer));
1589 /* use default handler to provide initial (upstream) metadata */
1590 gst_base_parse_parse_frame (parse, frame);
1592 /* store offset as it might get overwritten */
1593 offset = GST_BUFFER_OFFSET (buffer);
1594 ret = klass->parse_frame (parse, frame);
1596 buffer = frame->buffer;
1597 /* subclass must play nice */
1598 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1600 /* check if subclass/format can provide ts.
1601 * If so, that allows and enables extra seek and duration determining options */
1602 if (G_UNLIKELY (parse->priv->first_frame_offset < 0 && ret == GST_FLOW_OK)) {
1603 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1604 && parse->priv->pad_mode == GST_ACTIVATE_PULL) {
1605 parse->priv->first_frame_offset = offset;
1606 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1607 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1608 " for first frame at offset %" G_GINT64_FORMAT,
1609 GST_TIME_ARGS (parse->priv->first_frame_ts),
1610 parse->priv->first_frame_offset);
1611 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1613 GstClockTime last_ts = G_MAXINT64;
1615 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1616 gst_base_parse_locate_time (parse, &last_ts, &off);
1617 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1618 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1621 /* disable further checks */
1622 parse->priv->first_frame_offset = 0;
1626 /* again use default handler to add missing metadata;
1627 * we may have new information on frame properties */
1628 gst_base_parse_parse_frame (parse, frame);
1629 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1630 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1631 parse->priv->next_ts =
1632 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1634 /* we lost track, do not produce bogus time next time around
1635 * (probably means parser subclass has given up on parsing as well) */
1636 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1637 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1640 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1641 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1642 gst_base_parse_add_index_entry (parse, offset,
1643 GST_BUFFER_TIMESTAMP (buffer),
1644 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1646 /* First buffers are dropped, this means that the subclass needs more
1647 * frames to decide on the format and queues them internally */
1648 /* convert internal flow to OK and mark discont for the next buffer. */
1649 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1650 gst_base_parse_frame_free (frame);
1652 } else if (ret == GST_BASE_PARSE_FLOW_QUEUED) {
1653 gst_base_parse_queue_frame (parse, frame);
1655 } else if (ret != GST_FLOW_OK) {
1659 /* All OK, push queued frames if there are any */
1660 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1661 GstBaseParseFrame *queued_frame;
1663 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1664 queued_frame->buffer = gst_buffer_make_writable (queued_frame->buffer);
1665 gst_buffer_set_caps (queued_frame->buffer,
1666 GST_PAD_CAPS (GST_BASE_PARSE_SRC_PAD (parse)));
1667 gst_base_parse_push_frame (parse, queued_frame);
1668 gst_base_parse_frame_free (queued_frame);
1672 return gst_base_parse_push_frame (parse, frame);
1676 * gst_base_parse_push_frame:
1677 * @parse: #GstBaseParse.
1678 * @frame: (transfer full): a #GstBaseParseFrame
1680 * Pushes the frame downstream, sends any pending events and
1681 * does some timestamp and segment handling. Takes ownership
1682 * of @frame and will clear it (if it was initialised with
1683 * gst_base_parse_frame_init()) or free it.
1685 * This must be called with sinkpad STREAM_LOCK held.
1687 * Returns: #GstFlowReturn
1692 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1694 GstFlowReturn ret = GST_FLOW_OK;
1695 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1696 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1697 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1701 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1702 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1704 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1706 buffer = frame->buffer;
1708 GST_LOG_OBJECT (parse,
1709 "processing buffer of size %d with ts %" GST_TIME_FORMAT
1710 ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer),
1711 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1712 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1715 size = gst_buffer_get_size (buffer);
1716 parse->priv->bytecount += size;
1717 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1718 parse->priv->framecount++;
1719 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1720 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1723 /* 0 means disabled */
1724 if (parse->priv->update_interval < 0)
1725 parse->priv->update_interval = 50;
1726 else if (parse->priv->update_interval > 0 &&
1727 (parse->priv->framecount % parse->priv->update_interval) == 0)
1728 gst_base_parse_update_duration (parse);
1730 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1731 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1732 if (last_start != GST_CLOCK_TIME_NONE
1733 && GST_BUFFER_DURATION_IS_VALID (buffer))
1734 last_stop = last_start + GST_BUFFER_DURATION (buffer);
1736 /* should have caps by now */
1737 g_return_val_if_fail (GST_PAD_CAPS (parse->srcpad), GST_FLOW_ERROR);
1739 /* segment adjustment magic; only if we are running the whole show */
1740 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
1741 (parse->priv->pad_mode == GST_ACTIVATE_PULL ||
1742 parse->priv->upstream_seekable)) {
1743 /* segment times are typically estimates,
1744 * actual frame data might lead subclass to different timestamps,
1745 * so override segment start from what is supplied there */
1746 if (G_UNLIKELY (parse->priv->pending_segment && !parse->priv->exact_position
1747 && GST_CLOCK_TIME_IS_VALID (last_start))) {
1748 gst_event_unref (parse->priv->pending_segment);
1749 parse->segment.start =
1750 MIN ((guint64) last_start, (guint64) parse->segment.stop);
1751 GST_DEBUG_OBJECT (parse,
1752 "adjusting pending segment start to %" GST_TIME_FORMAT,
1753 GST_TIME_ARGS (parse->segment.start));
1754 parse->priv->pending_segment =
1755 gst_event_new_new_segment (FALSE, parse->segment.rate,
1756 parse->segment.format, parse->segment.start,
1757 parse->segment.stop, parse->segment.start);
1759 /* handle gaps, e.g. non-zero start-time, in as much not handled by above */
1760 if (GST_CLOCK_TIME_IS_VALID (parse->segment.last_stop) &&
1761 GST_CLOCK_TIME_IS_VALID (last_start)) {
1762 GstClockTimeDiff diff;
1764 /* only send newsegments with increasing start times,
1765 * otherwise if these go back and forth downstream (sinks) increase
1766 * accumulated time and running_time */
1767 diff = GST_CLOCK_DIFF (parse->segment.last_stop, last_start);
1768 if (G_UNLIKELY (diff > 2 * GST_SECOND
1769 && last_start > parse->segment.start
1770 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
1771 || last_start < parse->segment.stop))) {
1772 GST_DEBUG_OBJECT (parse,
1773 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
1774 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
1775 "Sending updated NEWSEGMENT events", diff,
1776 GST_TIME_ARGS (parse->segment.last_stop),
1777 GST_TIME_ARGS (last_start));
1778 if (G_UNLIKELY (parse->priv->pending_segment)) {
1779 gst_event_unref (parse->priv->pending_segment);
1780 parse->segment.start = last_start;
1781 parse->priv->pending_segment =
1782 gst_event_new_new_segment (FALSE, parse->segment.rate,
1783 parse->segment.format, parse->segment.start,
1784 parse->segment.stop, parse->segment.start);
1786 /* send newsegment events such that the gap is not accounted in
1787 * accum time, hence running_time */
1788 /* close ahead of gap */
1789 gst_pad_push_event (parse->srcpad,
1790 gst_event_new_new_segment (TRUE, parse->segment.rate,
1791 parse->segment.format, parse->segment.last_stop,
1792 parse->segment.last_stop, parse->segment.last_stop));
1794 gst_pad_push_event (parse->srcpad,
1795 gst_event_new_new_segment (FALSE, parse->segment.rate,
1796 parse->segment.format, last_start,
1797 parse->segment.stop, last_start));
1799 /* align segment view with downstream,
1800 * prevents double-counting accum when closing segment */
1801 gst_segment_set_newsegment (&parse->segment, FALSE,
1802 parse->segment.rate, parse->segment.format, last_start,
1803 parse->segment.stop, last_start);
1804 parse->segment.last_stop = last_start;
1809 /* and should then also be linked downstream, so safe to send some events */
1810 if (G_UNLIKELY (parse->priv->close_segment)) {
1811 /* only set up by loop */
1812 GST_DEBUG_OBJECT (parse, "loop sending close segment");
1813 gst_pad_push_event (parse->srcpad, parse->priv->close_segment);
1814 parse->priv->close_segment = NULL;
1816 if (G_UNLIKELY (parse->priv->pending_segment)) {
1817 GST_DEBUG_OBJECT (parse, "%s push pending segment",
1818 parse->priv->pad_mode == GST_ACTIVATE_PULL ? "loop" : "chain");
1819 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
1820 parse->priv->pending_segment = NULL;
1822 /* have caps; check identity */
1823 gst_base_parse_check_media (parse);
1826 /* update bitrates and optionally post corresponding tags
1827 * (following newsegment) */
1828 gst_base_parse_update_bitrates (parse, frame);
1830 if (G_UNLIKELY (parse->priv->pending_events)) {
1833 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
1834 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
1836 g_list_free (parse->priv->pending_events);
1837 parse->priv->pending_events = NULL;
1840 if (klass->pre_push_frame) {
1841 ret = klass->pre_push_frame (parse, frame);
1843 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
1846 /* take final ownership of frame buffer */
1847 buffer = frame->buffer;
1848 frame->buffer = NULL;
1850 /* subclass must play nice */
1851 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1854 buffer = gst_buffer_make_writable (buffer);
1855 gst_buffer_set_caps (buffer, GST_PAD_CAPS (parse->srcpad));
1857 parse->priv->seen_keyframe |= parse->priv->is_video &&
1858 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
1860 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
1861 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1862 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
1863 GST_BUFFER_TIMESTAMP (buffer) >
1864 parse->segment.stop + parse->priv->lead_out_ts) {
1865 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
1866 ret = GST_FLOW_UNEXPECTED;
1867 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1868 GST_BUFFER_DURATION_IS_VALID (buffer) &&
1869 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
1870 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
1871 parse->priv->lead_in_ts < parse->segment.start) {
1872 if (parse->priv->seen_keyframe) {
1873 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
1876 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
1877 ret = GST_BASE_PARSE_FLOW_DROPPED;
1884 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1885 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
1886 gst_buffer_unref (buffer);
1888 } else if (ret == GST_FLOW_OK) {
1889 if (parse->segment.rate > 0.0) {
1890 ret = gst_pad_push (parse->srcpad, buffer);
1891 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) pushed: %s",
1892 size, gst_flow_get_name (ret));
1894 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
1896 parse->priv->buffers_queued =
1897 g_slist_prepend (parse->priv->buffers_queued, buffer);
1901 gst_buffer_unref (buffer);
1902 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
1903 size, gst_flow_get_name (ret));
1904 /* if we are not sufficiently in control, let upstream decide on EOS */
1905 if (ret == GST_FLOW_UNEXPECTED &&
1906 (parse->priv->passthrough ||
1907 (parse->priv->pad_mode == GST_ACTIVATE_PUSH &&
1908 !parse->priv->upstream_seekable)))
1912 /* Update current running segment position */
1913 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
1914 parse->segment.last_stop < last_stop)
1915 gst_segment_set_last_stop (&parse->segment, GST_FORMAT_TIME, last_stop);
1917 gst_base_parse_frame_free (frame);
1923 /* gst_base_parse_drain:
1925 * Drains the adapter until it is empty. It decreases the min_frame_size to
1926 * match the current adapter size and calls chain method until the adapter
1927 * is emptied or chain returns with error.
1930 gst_base_parse_drain (GstBaseParse * parse)
1934 GST_DEBUG_OBJECT (parse, "draining");
1935 parse->priv->drain = TRUE;
1938 avail = gst_adapter_available (parse->priv->adapter);
1942 if (gst_base_parse_chain (parse->sinkpad, NULL) != GST_FLOW_OK) {
1946 /* nothing changed, maybe due to truncated frame; break infinite loop */
1947 if (avail == gst_adapter_available (parse->priv->adapter)) {
1948 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
1949 gst_adapter_clear (parse->priv->adapter);
1953 parse->priv->drain = FALSE;
1956 /* gst_base_parse_send_buffers
1958 * Sends buffers collected in send_buffers downstream, and ensures that list
1959 * is empty at the end (errors or not).
1961 static GstFlowReturn
1962 gst_base_parse_send_buffers (GstBaseParse * parse)
1964 GSList *send = NULL;
1966 GstFlowReturn ret = GST_FLOW_OK;
1968 send = parse->priv->buffers_send;
1972 buf = GST_BUFFER_CAST (send->data);
1973 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
1974 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
1975 ", offset %" G_GINT64_FORMAT, buf,
1976 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
1977 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
1979 /* iterate output queue an push downstream */
1980 ret = gst_pad_push (parse->srcpad, buf);
1981 send = g_slist_delete_link (send, send);
1983 /* clear any leftover if error */
1984 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
1986 buf = GST_BUFFER_CAST (send->data);
1987 gst_buffer_unref (buf);
1988 send = g_slist_delete_link (send, send);
1993 parse->priv->buffers_send = send;
1998 /* gst_base_parse_process_fragment:
2000 * Processes a reverse playback (forward) fragment:
2001 * - append head of last fragment that was skipped to current fragment data
2002 * - drain the resulting current fragment data (i.e. repeated chain)
2003 * - add time/duration (if needed) to frames queued by chain
2004 * - push queued data
2006 static GstFlowReturn
2007 gst_base_parse_process_fragment (GstBaseParse * parse, gboolean push_only)
2010 GstFlowReturn ret = GST_FLOW_OK;
2011 gboolean seen_key = FALSE, seen_delta = FALSE;
2017 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2018 while (parse->priv->buffers_pending) {
2019 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2020 GST_LOG_OBJECT (parse, "adding pending buffer (size %d)",
2021 gst_buffer_get_size (buf));
2022 gst_adapter_push (parse->priv->adapter, buf);
2023 parse->priv->buffers_pending =
2024 g_slist_delete_link (parse->priv->buffers_pending,
2025 parse->priv->buffers_pending);
2028 /* invalidate so no fall-back timestamping is performed;
2029 * ok if taken from subclass or upstream */
2030 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2031 /* prevent it hanging around stop all the time */
2032 parse->segment.last_stop = GST_CLOCK_TIME_NONE;
2034 parse->priv->discont = TRUE;
2036 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2037 /* initial skipped data is added to buffers_pending */
2038 gst_base_parse_drain (parse);
2041 if (parse->priv->buffers_send) {
2042 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2043 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2046 /* add metadata (if needed to queued buffers */
2047 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2048 GST_TIME_ARGS (parse->priv->last_ts));
2049 while (parse->priv->buffers_queued) {
2050 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2052 /* no touching if upstream or parsing provided time */
2053 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2054 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2055 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2056 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2057 GST_BUFFER_DURATION_IS_VALID (buf)) {
2058 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2059 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2061 parse->priv->last_ts = 0;
2062 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2063 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2064 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2066 /* no idea, very bad */
2067 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2070 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2072 /* reverse order for ascending sending */
2073 /* send downstream at keyframe not preceded by a keyframe
2074 * (e.g. that should identify start of collection of IDR nals) */
2075 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2077 ret = gst_base_parse_send_buffers (parse);
2078 /* if a problem, throw all to sending */
2079 if (ret != GST_FLOW_OK) {
2080 parse->priv->buffers_send =
2081 g_slist_reverse (parse->priv->buffers_queued);
2082 parse->priv->buffers_queued = NULL;
2091 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2093 parse->priv->buffers_send =
2094 g_slist_prepend (parse->priv->buffers_send, buf);
2095 parse->priv->buffers_queued =
2096 g_slist_delete_link (parse->priv->buffers_queued,
2097 parse->priv->buffers_queued);
2100 /* audio may have all marked as keyframe, so arrange to send here */
2102 ret = gst_base_parse_send_buffers (parse);
2104 /* any trailing unused no longer usable (ideally none) */
2105 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2106 GST_DEBUG_OBJECT (parse, "discarding %d trailing bytes",
2107 gst_adapter_available (parse->priv->adapter));
2108 gst_adapter_clear (parse->priv->adapter);
2114 /* small helper that checks whether we have been trying to resync too long */
2115 static inline GstFlowReturn
2116 gst_base_parse_check_sync (GstBaseParse * parse)
2118 if (G_UNLIKELY (parse->priv->discont &&
2119 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2120 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2121 ("Failed to parse stream"), (NULL));
2122 return GST_FLOW_ERROR;
2128 static GstFlowReturn
2129 gst_base_parse_chain (GstPad * pad, GstBuffer * buffer)
2131 GstBaseParseClass *bclass;
2132 GstBaseParse *parse;
2133 GstFlowReturn ret = GST_FLOW_OK;
2134 GstBuffer *outbuf = NULL;
2135 GstBuffer *tmpbuf = NULL;
2139 guint old_min_size = 0, min_size, av;
2140 GstClockTime timestamp;
2141 GstBaseParseFrame _frame;
2142 GstBaseParseFrame *frame;
2144 parse = GST_BASE_PARSE (GST_OBJECT_PARENT (pad));
2145 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2148 gst_base_parse_frame_init (frame);
2150 if (G_LIKELY (buffer)) {
2151 GST_LOG_OBJECT (parse, "buffer size: %d, offset = %" G_GINT64_FORMAT,
2152 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer));
2153 if (G_UNLIKELY (parse->priv->passthrough)) {
2154 frame->buffer = gst_buffer_make_writable (buffer);
2155 return gst_base_parse_push_frame (parse, frame);
2157 /* upstream feeding us in reverse playback;
2158 * gather each fragment, then process it in single run */
2159 if (parse->segment.rate < 0.0) {
2160 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2161 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2162 ret = gst_base_parse_process_fragment (parse, FALSE);
2164 gst_adapter_push (parse->priv->adapter, buffer);
2167 gst_adapter_push (parse->priv->adapter, buffer);
2170 /* Parse and push as many frames as possible */
2171 /* Stop either when adapter is empty or we are flushing */
2172 while (!parse->priv->flushing) {
2175 tmpbuf = gst_buffer_new ();
2178 /* Synchronization loop */
2180 min_size = MAX (parse->priv->min_frame_size, fsize);
2181 av = gst_adapter_available (parse->priv->adapter);
2183 /* loop safety check */
2184 if (G_UNLIKELY (old_min_size >= min_size))
2186 old_min_size = min_size;
2188 if (G_UNLIKELY (parse->priv->drain)) {
2190 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2191 if (G_UNLIKELY (!min_size)) {
2192 gst_buffer_unref (tmpbuf);
2197 /* Collect at least min_frame_size bytes */
2198 if (av < min_size) {
2199 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)",
2201 gst_buffer_unref (tmpbuf);
2205 /* always pass all available data */
2206 data = gst_adapter_map (parse->priv->adapter, av);
2207 gst_buffer_take_memory (tmpbuf,
2208 gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY,
2209 (gpointer) data, NULL, min_size, 0, min_size));
2210 GST_BUFFER_OFFSET (tmpbuf) = parse->priv->offset;
2212 if (parse->priv->discont) {
2213 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2214 GST_BUFFER_FLAG_SET (tmpbuf, GST_BUFFER_FLAG_DISCONT);
2218 gst_base_parse_frame_update (parse, frame, tmpbuf);
2219 res = bclass->check_valid_frame (parse, frame, &fsize, &skip);
2220 gst_adapter_unmap (parse->priv->adapter, 0);
2221 gst_buffer_replace (&frame->buffer, NULL);
2223 if (gst_adapter_available (parse->priv->adapter) < fsize) {
2224 GST_DEBUG_OBJECT (parse,
2225 "found valid frame but not enough data available (only %d bytes)",
2226 gst_adapter_available (parse->priv->adapter));
2227 gst_buffer_unref (tmpbuf);
2230 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2234 /* subclass didn't touch this value. By default we skip 1 byte */
2238 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2239 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2240 /* reverse playback, and no frames found yet, so we are skipping
2241 * the leading part of a fragment, which may form the tail of
2242 * fragment coming later, hopefully subclass skips efficiently ... */
2243 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2244 outbuf = gst_adapter_take_buffer (parse->priv->adapter, skip);
2245 outbuf = gst_buffer_make_writable (outbuf);
2246 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
2247 parse->priv->buffers_pending =
2248 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2251 gst_adapter_flush (parse->priv->adapter, skip);
2253 parse->priv->offset += skip;
2254 if (!parse->priv->discont)
2255 parse->priv->sync_offset = parse->priv->offset;
2256 parse->priv->discont = TRUE;
2257 /* something changed least; nullify loop check */
2260 /* skip == 0 should imply subclass set min_size to need more data;
2261 * we check this shortly */
2262 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2263 gst_buffer_unref (tmpbuf);
2267 gst_buffer_unref (tmpbuf);
2271 /* Subclass found the sync, but still wants to skip some data */
2272 GST_LOG_OBJECT (parse, "skipping %d bytes", skip);
2273 gst_adapter_flush (parse->priv->adapter, skip);
2274 parse->priv->offset += skip;
2277 /* Grab lock to prevent a race with FLUSH_START handler */
2278 GST_PAD_STREAM_LOCK (parse->srcpad);
2280 /* FLUSH_START event causes the "flushing" flag to be set. In this
2281 * case we can leave the frame pushing loop */
2282 if (parse->priv->flushing) {
2283 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2287 /* move along with upstream timestamp (if any),
2288 * but interpolate in between */
2289 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2290 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2291 (parse->priv->prev_ts != timestamp)) {
2292 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2295 /* FIXME: Would it be more efficient to make a subbuffer instead? */
2296 outbuf = gst_adapter_take_buffer (parse->priv->adapter, fsize);
2297 outbuf = gst_buffer_make_writable (outbuf);
2299 /* Subclass may want to know the data offset */
2300 GST_BUFFER_OFFSET (outbuf) = parse->priv->offset;
2301 parse->priv->offset += fsize;
2302 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2303 GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
2305 frame->buffer = outbuf;
2306 ret = gst_base_parse_handle_and_push_frame (parse, bclass, frame);
2307 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2309 if (ret != GST_FLOW_OK) {
2310 GST_LOG_OBJECT (parse, "push returned %d", ret);
2316 GST_LOG_OBJECT (parse, "chain leaving");
2322 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2323 ("min_size evolution %d -> %d; breaking to avoid looping",
2324 old_min_size, min_size));
2325 return GST_FLOW_ERROR;
2329 /* pull @size bytes at current offset,
2330 * i.e. at least try to and possibly return a shorter buffer if near the end */
2331 static GstFlowReturn
2332 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2333 GstBuffer ** buffer)
2335 GstFlowReturn ret = GST_FLOW_OK;
2337 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2339 /* Caching here actually makes much less difference than one would expect.
2340 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2341 if (parse->priv->cache) {
2342 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2343 gint cache_size = gst_buffer_get_size (parse->priv->cache);
2345 if (cache_offset <= parse->priv->offset &&
2346 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2347 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
2348 parse->priv->offset - cache_offset, size);
2349 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2352 /* not enough data in the cache, free cache and get a new one */
2353 gst_buffer_unref (parse->priv->cache);
2354 parse->priv->cache = NULL;
2357 /* refill the cache */
2359 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2360 64 * 1024), &parse->priv->cache);
2361 if (ret != GST_FLOW_OK) {
2362 parse->priv->cache = NULL;
2366 if (gst_buffer_get_size (parse->priv->cache) >= size) {
2368 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
2370 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2374 /* Not possible to get enough data, try a last time with
2375 * requesting exactly the size we need */
2376 gst_buffer_unref (parse->priv->cache);
2377 parse->priv->cache = NULL;
2379 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2380 &parse->priv->cache);
2382 if (ret != GST_FLOW_OK) {
2383 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2388 if (gst_buffer_get_size (parse->priv->cache) < size) {
2389 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2390 G_GUINT64_FORMAT ": wanted %u bytes, got %u bytes", parse->priv->offset,
2391 size, gst_buffer_get_size (parse->priv->cache));
2393 *buffer = parse->priv->cache;
2394 parse->priv->cache = NULL;
2400 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
2401 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2406 static GstFlowReturn
2407 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2410 GstClockTime ts = 0;
2414 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2415 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2416 parse->priv->last_offset);
2418 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2419 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2420 GST_TIME_ARGS (parse->segment.start));
2421 ret = GST_FLOW_UNEXPECTED;
2425 /* last fragment started at last_offset / last_ts;
2426 * seek back 10s capped at 1MB */
2427 if (parse->priv->last_ts >= 10 * GST_SECOND)
2428 ts = parse->priv->last_ts - 10 * GST_SECOND;
2429 /* if we are exact now, we will be more so going backwards */
2430 if (parse->priv->exact_position) {
2431 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2433 GstFormat dstformat = GST_FORMAT_BYTES;
2435 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2436 &dstformat, &offset)) {
2437 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2440 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2441 parse->priv->last_offset - 1024);
2442 offset = MAX (0, offset);
2444 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2446 parse->priv->offset = offset;
2448 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2450 if (ret != GST_FLOW_OK)
2453 /* offset will increase again as fragment is processed/parsed */
2454 parse->priv->last_offset = offset;
2456 gst_adapter_push (parse->priv->adapter, buffer);
2457 ret = gst_base_parse_process_fragment (parse, FALSE);
2458 if (ret != GST_FLOW_OK)
2461 /* force previous fragment */
2462 parse->priv->offset = -1;
2469 * pull and scan for next frame starting from current offset
2470 * ajusts sync, drain and offset going along */
2471 static GstFlowReturn
2472 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2473 GstBaseParseFrame * frame, gboolean full)
2475 GstBuffer *buffer, *outbuf;
2476 GstFlowReturn ret = GST_FLOW_OK;
2477 guint fsize = 1, min_size, old_min_size = 0;
2480 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2482 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2483 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2488 min_size = MAX (parse->priv->min_frame_size, fsize);
2489 /* loop safety check */
2490 if (G_UNLIKELY (old_min_size >= min_size))
2492 old_min_size = min_size;
2494 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2495 if (ret != GST_FLOW_OK)
2498 if (parse->priv->discont) {
2499 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2500 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
2503 /* if we got a short read, inform subclass we are draining leftover
2504 * and no more is to be expected */
2505 if (gst_buffer_get_size (buffer) < min_size)
2506 parse->priv->drain = TRUE;
2509 gst_base_parse_frame_update (parse, frame, buffer);
2510 res = klass->check_valid_frame (parse, frame, &fsize, &skip);
2511 gst_buffer_replace (&frame->buffer, NULL);
2513 parse->priv->drain = FALSE;
2514 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2517 parse->priv->drain = FALSE;
2521 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2522 if (full && parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2523 /* reverse playback, and no frames found yet, so we are skipping
2524 * the leading part of a fragment, which may form the tail of
2525 * fragment coming later, hopefully subclass skips efficiently ... */
2526 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, 0, skip);
2527 parse->priv->buffers_pending =
2528 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2531 parse->priv->offset += skip;
2532 if (!parse->priv->discont)
2533 parse->priv->sync_offset = parse->priv->offset;
2534 parse->priv->discont = TRUE;
2535 /* something changed least; nullify loop check */
2538 /* skip == 0 should imply subclass set min_size to need more data;
2539 * we check this shortly */
2540 GST_DEBUG_OBJECT (parse, "finding sync...");
2541 gst_buffer_unref (buffer);
2542 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2547 /* Does the subclass want to skip too? */
2549 parse->priv->offset += skip;
2553 if (fsize + skip <= gst_buffer_get_size (buffer)) {
2554 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, skip, fsize);
2555 GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer) + skip;
2556 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2557 gst_buffer_unref (buffer);
2559 gst_buffer_unref (buffer);
2560 ret = gst_base_parse_pull_range (parse, fsize, &outbuf);
2561 if (ret != GST_FLOW_OK)
2563 if (gst_buffer_get_size (outbuf) < fsize) {
2564 gst_buffer_unref (outbuf);
2565 ret = GST_FLOW_UNEXPECTED;
2569 parse->priv->offset += fsize;
2571 frame->buffer = outbuf;
2579 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2580 ("min_size evolution %d -> %d; breaking to avoid looping",
2581 old_min_size, min_size));
2582 return GST_FLOW_ERROR;
2586 /* Loop that is used in pull mode to retrieve data from upstream */
2588 gst_base_parse_loop (GstPad * pad)
2590 GstBaseParse *parse;
2591 GstBaseParseClass *klass;
2592 GstFlowReturn ret = GST_FLOW_OK;
2593 GstBaseParseFrame frame;
2595 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2596 klass = GST_BASE_PARSE_GET_CLASS (parse);
2598 /* reverse playback:
2599 * first fragment (closest to stop time) is handled normally below,
2600 * then we pull in fragments going backwards */
2601 if (parse->segment.rate < 0.0) {
2602 /* check if we jumped back to a previous fragment,
2603 * which is a post-first fragment */
2604 if (parse->priv->offset < 0) {
2605 ret = gst_base_parse_handle_previous_fragment (parse);
2610 gst_base_parse_frame_init (&frame);
2611 ret = gst_base_parse_scan_frame (parse, klass, &frame, TRUE);
2612 if (ret != GST_FLOW_OK)
2615 /* This always cleans up frame, even if error occurs */
2616 ret = gst_base_parse_handle_and_push_frame (parse, klass, &frame);
2618 /* eat expected eos signalling past segment in reverse playback */
2619 if (parse->segment.rate < 0.0 && ret == GST_FLOW_UNEXPECTED &&
2620 parse->segment.last_stop >= parse->segment.stop) {
2621 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2622 /* push what was accumulated during loop run */
2623 gst_base_parse_process_fragment (parse, TRUE);
2624 /* force previous fragment */
2625 parse->priv->offset = -1;
2630 if (ret == GST_FLOW_UNEXPECTED)
2632 else if (ret != GST_FLOW_OK)
2635 gst_object_unref (parse);
2641 ret = GST_FLOW_UNEXPECTED;
2642 GST_DEBUG_OBJECT (parse, "eos");
2647 gboolean push_eos = FALSE;
2649 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2650 gst_flow_get_name (ret));
2651 gst_pad_pause_task (parse->sinkpad);
2653 if (ret == GST_FLOW_UNEXPECTED) {
2654 /* handle end-of-stream/segment */
2655 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2658 if ((stop = parse->segment.stop) == -1)
2659 stop = parse->segment.duration;
2661 GST_DEBUG_OBJECT (parse, "sending segment_done");
2663 gst_element_post_message
2664 (GST_ELEMENT_CAST (parse),
2665 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2666 GST_FORMAT_TIME, stop));
2668 /* If we STILL have zero frames processed, fire an error */
2669 if (parse->priv->framecount == 0) {
2670 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2671 ("No valid frames found before end of stream"), (NULL));
2675 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_UNEXPECTED) {
2676 /* for fatal errors we post an error message, wrong-state is
2677 * not fatal because it happens due to flushes and only means
2678 * that we should stop now. */
2679 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2680 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
2684 /* newsegment before eos */
2685 if (parse->priv->pending_segment) {
2686 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
2687 parse->priv->pending_segment = NULL;
2689 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
2691 gst_object_unref (parse);
2696 gst_base_parse_sink_activate (GstPad * sinkpad)
2698 GstBaseParse *parse;
2699 gboolean result = TRUE;
2701 parse = GST_BASE_PARSE (gst_pad_get_parent (sinkpad));
2703 GST_DEBUG_OBJECT (parse, "sink activate");
2705 if (gst_pad_check_pull_range (sinkpad)) {
2706 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
2707 result = gst_pad_activate_pull (sinkpad, TRUE);
2709 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
2710 result = gst_pad_activate_push (sinkpad, TRUE);
2713 GST_DEBUG_OBJECT (parse, "sink activate return %d", result);
2714 gst_object_unref (parse);
2719 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
2721 GstBaseParseClass *klass;
2722 gboolean result = FALSE;
2724 GST_DEBUG_OBJECT (parse, "activate %d", active);
2726 klass = GST_BASE_PARSE_GET_CLASS (parse);
2729 if (parse->priv->pad_mode == GST_ACTIVATE_NONE && klass->start)
2730 result = klass->start (parse);
2732 /* We must make sure streaming has finished before resetting things
2733 * and calling the ::stop vfunc */
2734 GST_PAD_STREAM_LOCK (parse->sinkpad);
2735 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
2737 if (parse->priv->pad_mode != GST_ACTIVATE_NONE && klass->stop)
2738 result = klass->stop (parse);
2740 parse->priv->pad_mode = GST_ACTIVATE_NONE;
2742 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
2747 gst_base_parse_sink_activate_push (GstPad * pad, gboolean active)
2749 gboolean result = TRUE;
2750 GstBaseParse *parse;
2752 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2754 GST_DEBUG_OBJECT (parse, "sink activate push %d", active);
2756 result = gst_base_parse_activate (parse, active);
2759 parse->priv->pad_mode = active ? GST_ACTIVATE_PUSH : GST_ACTIVATE_NONE;
2761 GST_DEBUG_OBJECT (parse, "sink activate push return: %d", result);
2763 gst_object_unref (parse);
2768 gst_base_parse_sink_activate_pull (GstPad * sinkpad, gboolean active)
2770 gboolean result = FALSE;
2771 GstBaseParse *parse;
2773 parse = GST_BASE_PARSE (gst_pad_get_parent (sinkpad));
2775 GST_DEBUG_OBJECT (parse, "activate pull %d", active);
2777 result = gst_base_parse_activate (parse, active);
2781 parse->priv->pending_segment = gst_event_new_new_segment (FALSE,
2782 parse->segment.rate, parse->segment.format,
2783 parse->segment.start, parse->segment.stop, parse->segment.last_stop);
2785 gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop,
2788 result &= gst_pad_stop_task (sinkpad);
2793 parse->priv->pad_mode = active ? GST_ACTIVATE_PULL : GST_ACTIVATE_NONE;
2795 GST_DEBUG_OBJECT (parse, "sink activate pull return: %d", result);
2797 gst_object_unref (parse);
2803 * gst_base_parse_set_duration:
2804 * @parse: #GstBaseParse.
2806 * @duration: duration value.
2807 * @interval: how often to update the duration estimate based on bitrate, or 0.
2809 * Sets the duration of the currently playing media. Subclass can use this
2810 * when it is able to determine duration and/or notices a change in the media
2811 * duration. Alternatively, if @interval is non-zero (default), then stream
2812 * duration is determined based on estimated bitrate, and updated every @interval
2818 gst_base_parse_set_duration (GstBaseParse * parse,
2819 GstFormat fmt, gint64 duration, gint interval)
2821 g_return_if_fail (parse != NULL);
2823 if (parse->priv->upstream_has_duration) {
2824 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
2828 if (duration != parse->priv->duration) {
2831 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
2832 gst_element_post_message (GST_ELEMENT (parse), m);
2834 /* TODO: what about duration tag? */
2836 parse->priv->duration = duration;
2837 parse->priv->duration_fmt = fmt;
2838 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
2839 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
2840 if (interval != 0) {
2841 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
2845 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
2846 parse->priv->update_interval = interval;
2852 * gst_base_parse_set_average_bitrate:
2853 * @parse: #GstBaseParse.
2854 * @bitrate: average bitrate in bits/second
2856 * Optionally sets the average bitrate detected in media (if non-zero),
2857 * e.g. based on metadata, as it will be posted to the application.
2859 * By default, announced average bitrate is estimated. The average bitrate
2860 * is used to estimate the total duration of the stream and to estimate
2861 * a seek position, if there's no index and #GST_BASE_PARSE_FORMAT_FLAG_SYNCABLE
2867 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
2869 parse->priv->bitrate = bitrate;
2870 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
2874 * gst_base_parse_set_min_frame_size:
2875 * @parse: #GstBaseParse.
2876 * @min_size: Minimum size of the data that this base class should give to
2879 * Subclass can use this function to tell the base class that it needs to
2880 * give at least #min_size buffers.
2885 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
2887 g_return_if_fail (parse != NULL);
2889 parse->priv->min_frame_size = min_size;
2890 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
2894 * gst_base_parse_set_frame_rate:
2895 * @parse: the #GstBaseParse to set
2896 * @fps_num: frames per second (numerator).
2897 * @fps_den: frames per second (denominator).
2898 * @lead_in: frames needed before a segment for subsequent decode
2899 * @lead_out: frames needed after a segment
2901 * If frames per second is configured, parser can take care of buffer duration
2902 * and timestamping. When performing segment clipping, or seeking to a specific
2903 * location, a corresponding decoder might need an initial @lead_in and a
2904 * following @lead_out number of frames to ensure the desired segment is
2905 * entirely filled upon decoding.
2910 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
2911 guint fps_den, guint lead_in, guint lead_out)
2913 g_return_if_fail (parse != NULL);
2915 parse->priv->fps_num = fps_num;
2916 parse->priv->fps_den = fps_den;
2917 if (!fps_num || !fps_den) {
2918 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
2920 fps_num = fps_den = 0;
2921 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
2922 parse->priv->lead_in = parse->priv->lead_out = 0;
2923 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
2925 parse->priv->frame_duration =
2926 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
2927 parse->priv->lead_in = lead_in;
2928 parse->priv->lead_out = lead_out;
2929 parse->priv->lead_in_ts =
2930 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
2931 parse->priv->lead_out_ts =
2932 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
2933 /* aim for about 1.5s to estimate duration */
2934 if (parse->priv->update_interval < 0) {
2935 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
2936 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
2937 parse->priv->update_interval);
2940 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
2941 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
2942 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
2943 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
2944 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
2945 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
2949 * gst_base_parse_set_has_timing_info:
2950 * @parse: a #GstBaseParse
2951 * @has_timing: whether frames carry timing information
2953 * Set if frames carry timing information which the subclass can (generally)
2954 * parse and provide. In particular, intrinsic (rather than estimated) time
2955 * can be obtained following a seek.
2960 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
2962 parse->priv->has_timing_info = has_timing;
2963 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
2967 * gst_base_parse_set_syncable:
2968 * @parse: a #GstBaseParse
2969 * @syncable: set if frame starts can be identified
2971 * Set if frame starts can be identified. This is set by default and
2972 * determines whether seeking based on bitrate averages
2973 * is possible for a format/stream.
2978 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
2980 parse->priv->syncable = syncable;
2981 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
2985 * gst_base_parse_set_passthrough:
2986 * @parse: a #GstBaseParse
2989 * Set if the nature of the format or configuration does not allow (much)
2990 * parsing, and the parser should operate in passthrough mode (which only
2991 * applies when operating in push mode). That is, incoming buffers are
2992 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
2993 * callbacks will be invoked, but @pre_push_buffer will still be invoked,
2994 * so subclass can perform as much or as little is appropriate for
2995 * passthrough semantics in @pre_push_buffer.
3000 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3002 parse->priv->passthrough = passthrough;
3003 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3007 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3008 GstClockTime * duration)
3010 gboolean res = FALSE;
3012 g_return_val_if_fail (duration != NULL, FALSE);
3014 *duration = GST_CLOCK_TIME_NONE;
3015 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3016 GST_LOG_OBJECT (parse, "using provided duration");
3017 *duration = parse->priv->duration;
3019 } else if (parse->priv->duration != -1) {
3020 GST_LOG_OBJECT (parse, "converting provided duration");
3021 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3022 parse->priv->duration, format, (gint64 *) duration);
3023 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3024 GST_LOG_OBJECT (parse, "using estimated duration");
3025 *duration = parse->priv->estimated_duration;
3029 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3030 GST_TIME_ARGS (*duration));
3034 static const GstQueryType *
3035 gst_base_parse_get_querytypes (GstPad * pad)
3037 static const GstQueryType list[] = {
3050 gst_base_parse_query (GstPad * pad, GstQuery * query)
3052 GstBaseParse *parse;
3053 gboolean res = FALSE;
3055 parse = GST_BASE_PARSE (GST_PAD_PARENT (pad));
3057 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3059 switch (GST_QUERY_TYPE (query)) {
3060 case GST_QUERY_POSITION:
3065 GST_DEBUG_OBJECT (parse, "position query");
3066 gst_query_parse_position (query, &format, NULL);
3068 GST_OBJECT_LOCK (parse);
3069 if (format == GST_FORMAT_BYTES) {
3070 dest_value = parse->priv->offset;
3072 } else if (format == parse->segment.format &&
3073 GST_CLOCK_TIME_IS_VALID (parse->segment.last_stop)) {
3074 dest_value = parse->segment.last_stop;
3077 GST_OBJECT_UNLOCK (parse);
3080 gst_query_set_position (query, format, dest_value);
3082 res = gst_pad_query_default (pad, query);
3084 /* no precise result, upstream no idea either, then best estimate */
3085 /* priv->offset is updated in both PUSH/PULL modes */
3086 res = gst_base_parse_convert (parse,
3087 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3092 case GST_QUERY_DURATION:
3095 GstClockTime duration;
3097 GST_DEBUG_OBJECT (parse, "duration query");
3098 gst_query_parse_duration (query, &format, NULL);
3100 /* consult upstream */
3101 res = gst_pad_query_default (pad, query);
3103 /* otherwise best estimate from us */
3105 res = gst_base_parse_get_duration (parse, format, &duration);
3107 gst_query_set_duration (query, format, duration);
3111 case GST_QUERY_SEEKING:
3114 GstClockTime duration = GST_CLOCK_TIME_NONE;
3115 gboolean seekable = FALSE;
3117 GST_DEBUG_OBJECT (parse, "seeking query");
3118 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3120 /* consult upstream */
3121 res = gst_pad_query_default (pad, query);
3123 /* we may be able to help if in TIME */
3124 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3125 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3126 /* already OK if upstream takes care */
3127 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3129 if (!(res && seekable)) {
3130 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3131 || duration == -1) {
3132 /* seekable if we still have a chance to get duration later on */
3134 parse->priv->upstream_seekable && parse->priv->update_interval;
3136 seekable = parse->priv->upstream_seekable;
3137 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3140 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3146 case GST_QUERY_FORMATS:
3147 gst_query_set_formatsv (query, 3, fmtlist);
3150 case GST_QUERY_CONVERT:
3152 GstFormat src_format, dest_format;
3153 gint64 src_value, dest_value;
3155 gst_query_parse_convert (query, &src_format, &src_value,
3156 &dest_format, &dest_value);
3158 res = gst_base_parse_convert (parse, src_format, src_value,
3159 dest_format, &dest_value);
3161 gst_query_set_convert (query, src_format, src_value,
3162 dest_format, dest_value);
3167 res = gst_pad_query_default (pad, query);
3173 /* scans for a cluster start from @pos,
3174 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3175 static GstFlowReturn
3176 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3177 GstClockTime * time, GstClockTime * duration)
3179 GstBaseParseClass *klass;
3181 gboolean orig_drain, orig_discont;
3182 GstFlowReturn ret = GST_FLOW_OK;
3183 GstBuffer *buf = NULL;
3184 GstBaseParseFrame frame;
3186 g_return_val_if_fail (GST_FLOW_ERROR, pos != NULL);
3187 g_return_val_if_fail (GST_FLOW_ERROR, time != NULL);
3188 g_return_val_if_fail (GST_FLOW_ERROR, duration != NULL);
3190 klass = GST_BASE_PARSE_GET_CLASS (parse);
3192 *time = GST_CLOCK_TIME_NONE;
3193 *duration = GST_CLOCK_TIME_NONE;
3196 orig_offset = parse->priv->offset;
3197 orig_discont = parse->priv->discont;
3198 orig_drain = parse->priv->drain;
3200 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3201 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3203 gst_base_parse_frame_init (&frame);
3205 /* jump elsewhere and locate next frame */
3206 parse->priv->offset = *pos;
3207 ret = gst_base_parse_scan_frame (parse, klass, &frame, FALSE);
3208 if (ret != GST_FLOW_OK)
3212 GST_LOG_OBJECT (parse,
3213 "peek parsing frame at offset %" G_GUINT64_FORMAT
3214 " (%#" G_GINT64_MODIFIER "x) of size %d",
3215 GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET (buf),
3216 gst_buffer_get_size (buf));
3218 /* get offset first, subclass parsing might dump other stuff in there */
3219 *pos = GST_BUFFER_OFFSET (buf);
3220 ret = klass->parse_frame (parse, &frame);
3223 /* but it should provide proper time */
3224 *time = GST_BUFFER_TIMESTAMP (buf);
3225 *duration = GST_BUFFER_DURATION (buf);
3227 gst_base_parse_frame_free (&frame);
3229 GST_LOG_OBJECT (parse,
3230 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3231 GST_TIME_ARGS (*time), *pos);
3235 parse->priv->offset = orig_offset;
3236 parse->priv->discont = orig_discont;
3237 parse->priv->drain = orig_drain;
3242 /* bisect and scan through file for frame starting before @time,
3243 * returns OK and @time/@offset if found, NONE and/or error otherwise
3244 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3245 static GstFlowReturn
3246 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3249 GstFlowReturn ret = GST_FLOW_OK;
3250 gint64 lpos, hpos, newpos;
3251 GstClockTime time, ltime, htime, newtime, dur;
3252 gboolean cont = TRUE;
3253 const GstClockTime tolerance = TARGET_DIFFERENCE;
3254 const guint chunk = 4 * 1024;
3256 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3257 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3259 /* TODO also make keyframe aware if useful some day */
3274 /* do not know at first */
3276 *_time = GST_CLOCK_TIME_NONE;
3278 /* need initial positions; start and end */
3279 lpos = parse->priv->first_frame_offset;
3280 ltime = parse->priv->first_frame_ts;
3281 htime = parse->priv->duration;
3282 hpos = parse->priv->upstream_size;
3284 /* check preconditions are satisfied;
3285 * start and end are needed, except for special case where we scan for
3286 * last frame to determine duration */
3287 if (parse->priv->pad_mode != GST_ACTIVATE_PULL || !hpos ||
3288 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3289 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3293 /* shortcut cases */
3296 } else if (time < ltime + tolerance) {
3300 } else if (time >= htime) {
3306 while (htime > ltime && cont) {
3307 GST_LOG_OBJECT (parse,
3308 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3309 GST_TIME_ARGS (ltime));
3310 GST_LOG_OBJECT (parse,
3311 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3312 GST_TIME_ARGS (htime));
3313 if (G_UNLIKELY (time == G_MAXINT64)) {
3315 } else if (G_LIKELY (hpos > lpos)) {
3317 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3320 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3322 /* we check this case once, but not forever, so break loop */
3327 newpos = CLAMP (newpos, lpos, hpos);
3328 GST_LOG_OBJECT (parse,
3329 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3330 GST_TIME_ARGS (time), newpos);
3332 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3333 if (ret == GST_FLOW_UNEXPECTED) {
3334 /* heuristic HACK */
3335 hpos = MAX (lpos, hpos - chunk);
3337 } else if (ret != GST_FLOW_OK) {
3341 if (newtime == -1 || newpos == -1) {
3342 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3346 if (G_UNLIKELY (time == G_MAXINT64)) {
3349 if (GST_CLOCK_TIME_IS_VALID (dur))
3352 } else if (newtime > time) {
3354 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3356 } else if (newtime + tolerance > time) {
3357 /* close enough undershoot */
3361 } else if (newtime < ltime) {
3362 /* so a position beyond lpos resulted in earlier time than ltime ... */
3363 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3366 /* undershoot too far */
3367 newpos += newpos == lpos ? chunk : 0;
3368 lpos = CLAMP (newpos, lpos, hpos);
3374 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3375 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3380 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3381 gboolean before, GstClockTime * _ts)
3383 gint64 bytes = 0, ts = 0;
3384 GstIndexEntry *entry = NULL;
3386 if (time == GST_CLOCK_TIME_NONE) {
3392 GST_OBJECT_LOCK (parse);
3393 if (parse->priv->index) {
3394 /* Let's check if we have an index entry for that time */
3395 entry = gst_index_get_assoc_entry (parse->priv->index,
3396 parse->priv->index_id,
3397 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3398 GST_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3402 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3403 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3405 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3406 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3407 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3409 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3410 GST_TIME_ARGS (time));
3413 ts = GST_CLOCK_TIME_NONE;
3416 GST_OBJECT_UNLOCK (parse);
3425 /* returns TRUE if seek succeeded */
3427 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3432 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3433 gboolean flush, update, res = TRUE, accurate;
3434 gint64 cur, stop, seekpos, seekstop;
3435 GstSegment seeksegment = { 0, };
3436 GstFormat dstformat;
3437 GstClockTime start_ts;
3439 gst_event_parse_seek (event, &rate, &format, &flags,
3440 &cur_type, &cur, &stop_type, &stop);
3442 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3443 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3444 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3445 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3447 /* no negative rates in push mode */
3448 if (rate < 0.0 && parse->priv->pad_mode == GST_ACTIVATE_PUSH)
3451 if (cur_type != GST_SEEK_TYPE_SET ||
3452 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3455 /* For any format other than TIME, see if upstream handles
3456 * it directly or fail. For TIME, try upstream, but do it ourselves if
3457 * it fails upstream */
3458 if (format != GST_FORMAT_TIME) {
3459 /* default action delegates to upstream */
3463 gst_event_ref (event);
3464 if ((res = gst_pad_push_event (parse->sinkpad, event))) {
3469 /* get flush flag */
3470 flush = flags & GST_SEEK_FLAG_FLUSH;
3472 /* copy segment, we need this because we still need the old
3473 * segment when we close the current segment. */
3474 memcpy (&seeksegment, &parse->segment, sizeof (GstSegment));
3476 GST_DEBUG_OBJECT (parse, "configuring seek");
3477 gst_segment_set_seek (&seeksegment, rate, format, flags,
3478 cur_type, cur, stop_type, stop, &update);
3480 /* accurate seeking implies seek tables are used to obtain position,
3481 * and the requested segment is maintained exactly, not adjusted any way */
3482 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3484 /* maybe we can be accurate for (almost) free */
3485 gst_base_parse_find_offset (parse, seeksegment.last_stop, TRUE, &start_ts);
3486 if (seeksegment.last_stop <= start_ts + TARGET_DIFFERENCE) {
3487 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3491 GstClockTime startpos = seeksegment.last_stop;
3493 /* accurate requested, so ... seek a bit before target */
3494 if (startpos < parse->priv->lead_in_ts)
3497 startpos -= parse->priv->lead_in_ts;
3498 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3499 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3502 start_ts = seeksegment.last_stop;
3503 dstformat = GST_FORMAT_BYTES;
3504 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.last_stop,
3505 &dstformat, &seekpos))
3506 goto convert_failed;
3507 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3508 &dstformat, &seekstop))
3509 goto convert_failed;
3512 GST_DEBUG_OBJECT (parse,
3513 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3515 GST_DEBUG_OBJECT (parse,
3516 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3517 seeksegment.stop, seekstop);
3519 if (parse->priv->pad_mode == GST_ACTIVATE_PULL) {
3522 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3525 if (parse->srcpad) {
3526 GST_DEBUG_OBJECT (parse, "sending flush start");
3527 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3528 /* unlock upstream pull_range */
3529 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3532 gst_pad_pause_task (parse->sinkpad);
3535 /* we should now be able to grab the streaming thread because we stopped it
3536 * with the above flush/pause code */
3537 GST_PAD_STREAM_LOCK (parse->sinkpad);
3539 /* save current position */
3540 last_stop = parse->segment.last_stop;
3541 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3544 /* now commit to new position */
3546 /* prepare for streaming again */
3548 GST_DEBUG_OBJECT (parse, "sending flush stop");
3549 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop ());
3550 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop ());
3551 gst_base_parse_clear_queues (parse);
3553 if (parse->priv->close_segment)
3554 gst_event_unref (parse->priv->close_segment);
3556 parse->priv->close_segment = gst_event_new_new_segment (TRUE,
3557 parse->segment.rate, parse->segment.format,
3558 parse->segment.accum, parse->segment.last_stop, parse->segment.accum);
3560 /* keep track of our last_stop */
3561 seeksegment.accum = parse->segment.last_stop;
3563 GST_DEBUG_OBJECT (parse, "Created close seg format %d, "
3564 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3565 ", pos = %" GST_TIME_FORMAT, format,
3566 GST_TIME_ARGS (parse->segment.accum),
3567 GST_TIME_ARGS (parse->segment.last_stop),
3568 GST_TIME_ARGS (parse->segment.accum));
3571 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3573 /* store the newsegment event so it can be sent from the streaming thread. */
3574 if (parse->priv->pending_segment)
3575 gst_event_unref (parse->priv->pending_segment);
3577 /* This will be sent later in _loop() */
3578 parse->priv->pending_segment =
3579 gst_event_new_new_segment (FALSE, parse->segment.rate,
3580 parse->segment.format, parse->segment.start,
3581 parse->segment.stop, parse->segment.start);
3583 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3584 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3585 ", pos = %" GST_TIME_FORMAT, format,
3586 GST_TIME_ARGS (parse->segment.start),
3587 GST_TIME_ARGS (parse->segment.stop),
3588 GST_TIME_ARGS (parse->segment.start));
3590 /* one last chance in pull mode to stay accurate;
3591 * maybe scan and subclass can find where to go */
3594 GstClockTime ts = seeksegment.last_stop;
3596 gst_base_parse_locate_time (parse, &ts, &scanpos);
3600 /* running collected index now consists of several intervals,
3601 * so optimized check no longer possible */
3602 parse->priv->index_last_valid = FALSE;
3603 parse->priv->index_last_offset = 0;
3604 parse->priv->index_last_ts = 0;
3608 /* mark discont if we are going to stream from another position. */
3609 if (seekpos != parse->priv->offset) {
3610 GST_DEBUG_OBJECT (parse,
3611 "mark DISCONT, we did a seek to another position");
3612 parse->priv->offset = seekpos;
3613 parse->priv->last_offset = seekpos;
3614 parse->priv->seen_keyframe = FALSE;
3615 parse->priv->discont = TRUE;
3616 parse->priv->next_ts = start_ts;
3617 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3618 parse->priv->sync_offset = seekpos;
3619 parse->priv->exact_position = accurate;
3622 /* Start streaming thread if paused */
3623 gst_pad_start_task (parse->sinkpad,
3624 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3626 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3631 GstEvent *new_event;
3632 GstBaseParseSeek *seek;
3634 /* The only thing we need to do in PUSH-mode is to send the
3635 seek event (in bytes) to upstream. Segment / flush handling happens
3636 in corresponding src event handlers */
3637 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3638 if (seekstop >= 0 && seekpos <= seekpos)
3640 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flush,
3641 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3643 /* store segment info so its precise details can be reconstructed when
3644 * receiving newsegment;
3645 * this matters for all details when accurate seeking,
3646 * is most useful to preserve NONE stop time otherwise */
3647 seek = g_new0 (GstBaseParseSeek, 1);
3648 seek->segment = seeksegment;
3649 seek->accurate = accurate;
3650 seek->offset = seekpos;
3651 seek->start_ts = start_ts;
3652 GST_OBJECT_LOCK (parse);
3653 /* less optimal, but preserves order */
3654 parse->priv->pending_seeks =
3655 g_slist_append (parse->priv->pending_seeks, seek);
3656 GST_OBJECT_UNLOCK (parse);
3658 res = gst_pad_push_event (parse->sinkpad, new_event);
3661 GST_OBJECT_LOCK (parse);
3662 parse->priv->pending_seeks =
3663 g_slist_remove (parse->priv->pending_seeks, seek);
3664 GST_OBJECT_UNLOCK (parse);
3670 /* handled event is ours to free */
3672 gst_event_unref (event);
3678 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
3684 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
3690 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
3696 /* Checks if bitrates are available from upstream tags so that we don't
3697 * override them later
3700 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
3702 GstTagList *taglist = NULL;
3705 gst_event_parse_tag (event, &taglist);
3707 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
3708 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
3709 parse->priv->post_min_bitrate = FALSE;
3711 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
3712 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
3713 parse->priv->post_avg_bitrate = FALSE;
3715 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
3716 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
3717 parse->priv->post_max_bitrate = FALSE;
3722 gst_base_parse_sink_setcaps (GstPad * pad, GstCaps * caps)
3724 GstBaseParse *parse;
3725 GstBaseParseClass *klass;
3726 gboolean res = TRUE;
3728 parse = GST_BASE_PARSE (GST_PAD_PARENT (pad));
3729 klass = GST_BASE_PARSE_GET_CLASS (parse);
3731 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
3733 if (klass->set_sink_caps)
3734 res = klass->set_sink_caps (parse, caps);
3740 gst_base_parse_set_index (GstElement * element, GstIndex * index)
3742 GstBaseParse *parse = GST_BASE_PARSE (element);
3744 GST_OBJECT_LOCK (parse);
3745 if (parse->priv->index)
3746 gst_object_unref (parse->priv->index);
3748 parse->priv->index = gst_object_ref (index);
3749 gst_index_get_writer_id (index, GST_OBJECT (element),
3750 &parse->priv->index_id);
3751 parse->priv->own_index = FALSE;
3753 parse->priv->index = NULL;
3754 GST_OBJECT_UNLOCK (parse);
3758 gst_base_parse_get_index (GstElement * element)
3760 GstBaseParse *parse = GST_BASE_PARSE (element);
3761 GstIndex *result = NULL;
3763 GST_OBJECT_LOCK (parse);
3764 if (parse->priv->index)
3765 result = gst_object_ref (parse->priv->index);
3766 GST_OBJECT_UNLOCK (parse);
3771 static GstStateChangeReturn
3772 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
3774 GstBaseParse *parse;
3775 GstStateChangeReturn result;
3777 parse = GST_BASE_PARSE (element);
3779 switch (transition) {
3780 case GST_STATE_CHANGE_READY_TO_PAUSED:
3781 /* If this is our own index destroy it as the
3782 * old entries might be wrong for the new stream */
3783 if (parse->priv->own_index) {
3784 gst_object_unref (parse->priv->index);
3785 parse->priv->index = NULL;
3786 parse->priv->own_index = FALSE;
3789 /* If no index was created, generate one */
3790 if (G_UNLIKELY (!parse->priv->index)) {
3791 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
3793 parse->priv->index = gst_index_factory_make ("memindex");
3794 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
3795 &parse->priv->index_id);
3796 parse->priv->own_index = TRUE;
3803 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
3805 switch (transition) {
3806 case GST_STATE_CHANGE_PAUSED_TO_READY:
3807 gst_base_parse_reset (parse);