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);
402 static void gst_base_parse_frame_free (GstBaseParseFrame * frame);
405 gst_base_parse_clear_queues (GstBaseParse * parse)
407 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
408 g_slist_free (parse->priv->buffers_queued);
409 parse->priv->buffers_queued = NULL;
410 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
412 g_slist_free (parse->priv->buffers_pending);
413 parse->priv->buffers_pending = NULL;
414 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
415 g_slist_free (parse->priv->buffers_send);
416 parse->priv->buffers_send = NULL;
420 gst_base_parse_finalize (GObject * object)
422 GstBaseParse *parse = GST_BASE_PARSE (object);
425 g_object_unref (parse->priv->adapter);
427 if (parse->priv->pending_segment) {
428 p_ev = &parse->priv->pending_segment;
429 gst_event_replace (p_ev, NULL);
431 if (parse->priv->close_segment) {
432 p_ev = &parse->priv->close_segment;
433 gst_event_replace (p_ev, NULL);
436 if (parse->priv->cache) {
437 gst_buffer_unref (parse->priv->cache);
438 parse->priv->cache = NULL;
441 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
443 g_list_free (parse->priv->pending_events);
444 parse->priv->pending_events = NULL;
446 g_queue_foreach (&parse->priv->queued_frames,
447 (GFunc) gst_base_parse_frame_free, NULL);
448 g_queue_clear (&parse->priv->queued_frames);
450 if (parse->priv->index) {
451 gst_object_unref (parse->priv->index);
452 parse->priv->index = NULL;
455 gst_base_parse_clear_queues (parse);
457 G_OBJECT_CLASS (parent_class)->finalize (object);
461 gst_base_parse_class_init (GstBaseParseClass * klass)
463 GObjectClass *gobject_class;
464 GstElementClass *gstelement_class;
466 gobject_class = G_OBJECT_CLASS (klass);
467 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
468 parent_class = g_type_class_peek_parent (klass);
469 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
471 gstelement_class = (GstElementClass *) klass;
472 gstelement_class->change_state =
473 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
474 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
475 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
477 /* Default handlers */
478 klass->check_valid_frame = gst_base_parse_check_frame;
479 klass->parse_frame = gst_base_parse_parse_frame;
480 klass->src_event = gst_base_parse_src_eventfunc;
481 klass->convert = gst_base_parse_convert_default;
483 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
484 "baseparse element");
488 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
490 GstPadTemplate *pad_template;
492 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
494 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
497 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
498 g_return_if_fail (pad_template != NULL);
499 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
500 gst_pad_set_event_function (parse->sinkpad,
501 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
502 gst_pad_set_setcaps_function (parse->sinkpad,
503 GST_DEBUG_FUNCPTR (gst_base_parse_sink_setcaps));
504 gst_pad_set_chain_function (parse->sinkpad,
505 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
506 gst_pad_set_activate_function (parse->sinkpad,
507 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
508 gst_pad_set_activatepush_function (parse->sinkpad,
509 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_push));
510 gst_pad_set_activatepull_function (parse->sinkpad,
511 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_pull));
512 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
514 GST_DEBUG_OBJECT (parse, "sinkpad created");
517 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
518 g_return_if_fail (pad_template != NULL);
519 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
520 gst_pad_set_event_function (parse->srcpad,
521 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
522 gst_pad_set_query_type_function (parse->srcpad,
523 GST_DEBUG_FUNCPTR (gst_base_parse_get_querytypes));
524 gst_pad_set_query_function (parse->srcpad,
525 GST_DEBUG_FUNCPTR (gst_base_parse_query));
526 gst_pad_use_fixed_caps (parse->srcpad);
527 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
528 GST_DEBUG_OBJECT (parse, "src created");
530 g_queue_init (&parse->priv->queued_frames);
532 parse->priv->adapter = gst_adapter_new ();
534 parse->priv->pad_mode = GST_ACTIVATE_NONE;
537 gst_base_parse_reset (parse);
538 GST_DEBUG_OBJECT (parse, "init ok");
541 static GstBaseParseFrame *
542 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
544 GstBaseParseFrame *copy;
546 copy = g_slice_dup (GstBaseParseFrame, frame);
547 copy->buffer = gst_buffer_ref (frame->buffer);
548 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
550 GST_TRACE ("copied frame %p -> %p", frame, copy);
556 gst_base_parse_frame_free (GstBaseParseFrame * frame)
558 GST_TRACE ("freeing frame %p", frame);
561 gst_buffer_unref (frame->buffer);
562 frame->buffer = NULL;
565 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC))
566 g_slice_free (GstBaseParseFrame, frame);
570 gst_base_parse_frame_get_type (void)
572 static volatile gsize frame_type = 0;
574 if (g_once_init_enter (&frame_type)) {
577 _type = g_boxed_type_register_static ("GstBaseParseFrame",
578 (GBoxedCopyFunc) gst_base_parse_frame_copy,
579 (GBoxedFreeFunc) gst_base_parse_frame_free);
580 g_once_init_leave (&frame_type, _type);
582 return (GType) frame_type;
586 * gst_base_parse_frame_init:
587 * @frame: #GstBaseParseFrame.
589 * Sets a #GstBaseParseFrame to initial state. Currently this means
590 * all public fields are zero-ed and a private flag is set to make
591 * sure gst_base_parse_frame_free() only frees the contents but not
592 * the actual frame. Use this function to initialise a #GstBaseParseFrame
593 * allocated on the stack.
598 gst_base_parse_frame_init (GstBaseParseFrame * frame)
600 memset (frame, 0, sizeof (GstBaseParseFrame));
601 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
602 GST_TRACE ("inited frame %p", frame);
606 * gst_base_parse_frame_new:
607 * @buffer: (transfer none): a #GstBuffer
609 * @overhead: number of bytes in this frame which should be counted as
610 * metadata overhead, ie. not used to calculate the average bitrate.
611 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
613 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
614 * elements written in C should usually allocate the frame on the stack and
615 * then use gst_base_parse_frame_init() to initialise it.
617 * Returns: a newly-allocated #GstBaseParseFrame. Free with
618 * gst_base_parse_frame_free() when no longer needed, unless you gave
619 * away ownership to gst_base_parse_push_frame().
624 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
627 GstBaseParseFrame *frame;
629 frame = g_slice_new0 (GstBaseParseFrame);
630 frame->buffer = gst_buffer_ref (buffer);
632 GST_TRACE ("created frame %p", frame);
637 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
640 gst_buffer_replace (&frame->buffer, buf);
644 /* set flags one by one for clarity */
645 if (G_UNLIKELY (parse->priv->drain))
646 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
648 /* losing sync is pretty much a discont (and vice versa), no ? */
649 if (G_UNLIKELY (parse->priv->discont))
650 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
654 gst_base_parse_reset (GstBaseParse * parse)
656 GST_OBJECT_LOCK (parse);
657 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
658 parse->priv->duration = -1;
659 parse->priv->min_frame_size = 1;
660 parse->priv->discont = TRUE;
661 parse->priv->flushing = FALSE;
662 parse->priv->offset = 0;
663 parse->priv->sync_offset = 0;
664 parse->priv->update_interval = -1;
665 parse->priv->fps_num = parse->priv->fps_den = 0;
666 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
667 parse->priv->lead_in = parse->priv->lead_out = 0;
668 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
669 parse->priv->bitrate = 0;
670 parse->priv->framecount = 0;
671 parse->priv->bytecount = 0;
672 parse->priv->acc_duration = 0;
673 parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE;
674 parse->priv->first_frame_offset = -1;
675 parse->priv->estimated_duration = -1;
676 parse->priv->next_ts = 0;
677 parse->priv->syncable = TRUE;
678 parse->priv->passthrough = FALSE;
679 parse->priv->has_timing_info = FALSE;
680 parse->priv->post_min_bitrate = TRUE;
681 parse->priv->post_avg_bitrate = TRUE;
682 parse->priv->post_max_bitrate = TRUE;
683 parse->priv->min_bitrate = G_MAXUINT;
684 parse->priv->max_bitrate = 0;
685 parse->priv->avg_bitrate = 0;
686 parse->priv->posted_avg_bitrate = 0;
688 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
689 parse->priv->index_last_offset = -1;
690 parse->priv->index_last_valid = TRUE;
691 parse->priv->upstream_seekable = FALSE;
692 parse->priv->upstream_size = 0;
693 parse->priv->upstream_has_duration = FALSE;
694 parse->priv->idx_interval = 0;
695 parse->priv->exact_position = TRUE;
696 parse->priv->seen_keyframe = FALSE;
698 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
699 parse->priv->last_offset = 0;
701 if (parse->priv->pending_segment) {
702 gst_event_unref (parse->priv->pending_segment);
703 parse->priv->pending_segment = NULL;
706 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
708 g_list_free (parse->priv->pending_events);
709 parse->priv->pending_events = NULL;
711 if (parse->priv->cache) {
712 gst_buffer_unref (parse->priv->cache);
713 parse->priv->cache = NULL;
716 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
717 g_slist_free (parse->priv->pending_seeks);
718 parse->priv->pending_seeks = NULL;
719 GST_OBJECT_UNLOCK (parse);
722 /* gst_base_parse_check_frame:
723 * @parse: #GstBaseParse.
724 * @buffer: GstBuffer.
725 * @framesize: This will be set to tell the found frame size in bytes.
726 * @skipsize: Output parameter that tells how much data needs to be skipped
727 * in order to find the following frame header.
729 * Default callback for check_valid_frame.
731 * Returns: Always TRUE.
734 gst_base_parse_check_frame (GstBaseParse * parse,
735 GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
737 *framesize = GST_BUFFER_SIZE (frame->buffer);
743 /* gst_base_parse_parse_frame:
744 * @parse: #GstBaseParse.
745 * @buffer: #GstBuffer.
747 * Default callback for parse_frame.
750 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
752 GstBuffer *buffer = frame->buffer;
754 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
755 GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) {
756 GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts;
758 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
759 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
760 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
765 /* gst_base_parse_convert:
766 * @parse: #GstBaseParse.
767 * @src_format: #GstFormat describing the source format.
768 * @src_value: Source value to be converted.
769 * @dest_format: #GstFormat defining the converted format.
770 * @dest_value: Pointer where the conversion result will be put.
772 * Converts using configured "convert" vmethod in #GstBaseParse class.
774 * Returns: TRUE if conversion was successful.
777 gst_base_parse_convert (GstBaseParse * parse,
778 GstFormat src_format,
779 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
781 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
784 g_return_val_if_fail (dest_value != NULL, FALSE);
789 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
791 #ifndef GST_DISABLE_GST_DEBUG
794 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
795 GST_LOG_OBJECT (parse,
796 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
797 GST_TIME_ARGS (src_value), *dest_value);
798 } else if (dest_format == GST_FORMAT_TIME &&
799 src_format == GST_FORMAT_BYTES) {
800 GST_LOG_OBJECT (parse,
801 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
802 src_value, GST_TIME_ARGS (*dest_value));
804 GST_LOG_OBJECT (parse,
805 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
806 GST_STR_NULL (gst_format_get_name (src_format)),
807 GST_STR_NULL (gst_format_get_name (dest_format)),
808 src_value, *dest_value);
811 GST_DEBUG_OBJECT (parse, "conversion failed");
819 /* gst_base_parse_sink_event:
820 * @pad: #GstPad that received the event.
821 * @event: #GstEvent to be handled.
823 * Handler for sink pad events.
825 * Returns: TRUE if the event was handled.
828 gst_base_parse_sink_event (GstPad * pad, GstEvent * event)
831 GstBaseParseClass *bclass;
832 gboolean handled = FALSE;
835 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
836 bclass = GST_BASE_PARSE_GET_CLASS (parse);
838 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
839 GST_EVENT_TYPE_NAME (event));
841 /* Cache all events except EOS, NEWSEGMENT and FLUSH_STOP if we have a
843 if (parse->priv->pending_segment && GST_EVENT_TYPE (event) != GST_EVENT_EOS
844 && GST_EVENT_TYPE (event) != GST_EVENT_NEWSEGMENT
845 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
846 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP) {
848 if (GST_EVENT_TYPE (event) == GST_EVENT_TAG)
849 /* See if any bitrate tags were posted */
850 gst_base_parse_handle_tag (parse, event);
852 parse->priv->pending_events =
853 g_list_append (parse->priv->pending_events, event);
857 if (GST_EVENT_TYPE (event) == GST_EVENT_EOS &&
858 parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
859 /* We've not posted bitrate tags yet - do so now */
860 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
863 handled = bclass->event (parse, event);
866 handled = gst_base_parse_sink_eventfunc (parse, event);
869 ret = gst_pad_event_default (pad, event);
872 gst_object_unref (parse);
873 GST_DEBUG_OBJECT (parse, "event handled");
878 /* gst_base_parse_sink_eventfunc:
879 * @parse: #GstBaseParse.
880 * @event: #GstEvent to be handled.
882 * Element-level event handler function.
884 * The event will be unreffed only if it has been handled and this
885 * function returns %TRUE
887 * Returns: %TRUE if the event was handled and not need forwarding.
890 gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event)
892 gboolean handled = FALSE;
895 switch (GST_EVENT_TYPE (event)) {
896 case GST_EVENT_NEWSEGMENT:
898 gdouble rate, applied_rate;
900 gint64 start, stop, pos, next_ts, offset = 0;
903 gst_event_parse_new_segment_full (event, &update, &rate, &applied_rate,
904 &format, &start, &stop, &pos);
906 GST_DEBUG_OBJECT (parse, "newseg rate %g, applied rate %g, "
907 "format %d, start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
908 ", pos = %" GST_TIME_FORMAT, rate, applied_rate, format,
909 GST_TIME_ARGS (start), GST_TIME_ARGS (stop), GST_TIME_ARGS (pos));
911 if (format == GST_FORMAT_BYTES) {
912 GstClockTime seg_start, seg_stop;
913 GstBaseParseSeek *seek = NULL;
916 /* stop time is allowed to be open-ended, but not start & pos */
917 seg_stop = GST_CLOCK_TIME_NONE;
921 GST_OBJECT_LOCK (parse);
922 for (node = parse->priv->pending_seeks; node; node = node->next) {
923 GstBaseParseSeek *tmp = node->data;
925 if (tmp->offset == pos) {
930 parse->priv->pending_seeks =
931 g_slist_remove (parse->priv->pending_seeks, seek);
932 GST_OBJECT_UNLOCK (parse);
935 GST_DEBUG_OBJECT (parse,
936 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
937 seek->accurate ? " accurate" : "", &seek->segment);
938 seg_start = seek->segment.start;
939 seg_stop = seek->segment.stop;
940 next_ts = seek->start_ts;
941 parse->priv->exact_position = seek->accurate;
944 /* best attempt convert */
945 /* as these are only estimates, stop is kept open-ended to avoid
946 * premature cutting */
947 gst_base_parse_convert (parse, GST_FORMAT_BYTES, start,
948 GST_FORMAT_TIME, (gint64 *) & seg_start);
949 parse->priv->exact_position = (start == 0);
953 gst_event_unref (event);
954 event = gst_event_new_new_segment_full (update, rate, applied_rate,
955 GST_FORMAT_TIME, seg_start, seg_stop, seg_start);
956 format = GST_FORMAT_TIME;
959 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. "
960 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT,
961 GST_TIME_ARGS (seg_start), GST_TIME_ARGS (seg_stop));
962 } else if (format != GST_FORMAT_TIME) {
963 /* Unknown incoming segment format. Output a default open-ended
965 gst_event_unref (event);
966 event = gst_event_new_new_segment_full (update, rate, applied_rate,
967 GST_FORMAT_TIME, 0, GST_CLOCK_TIME_NONE, 0);
968 format = GST_FORMAT_TIME;
970 stop = GST_CLOCK_TIME_NONE;
972 /* not considered BYTE seekable if it is talking to us in TIME,
973 * whatever else it might claim */
974 parse->priv->upstream_seekable = FALSE;
978 gst_segment_set_newsegment_full (&parse->segment, update, rate,
979 applied_rate, format, start, stop, start);
981 /* save the segment for later, right before we push a new buffer so that
982 * the caps are fixed and the next linked element can receive
984 eventp = &parse->priv->pending_segment;
985 gst_event_replace (eventp, event);
986 gst_event_unref (event);
989 /* but finish the current segment */
990 GST_DEBUG_OBJECT (parse, "draining current segment");
991 if (parse->segment.rate > 0.0)
992 gst_base_parse_drain (parse);
994 gst_base_parse_process_fragment (parse, FALSE);
995 gst_adapter_clear (parse->priv->adapter);
996 parse->priv->offset = offset;
997 parse->priv->sync_offset = offset;
998 parse->priv->next_ts = next_ts;
999 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1000 parse->priv->discont = TRUE;
1001 parse->priv->seen_keyframe = FALSE;
1005 case GST_EVENT_FLUSH_START:
1006 parse->priv->flushing = TRUE;
1007 handled = gst_pad_push_event (parse->srcpad, gst_event_ref (event));
1009 gst_event_unref (event);
1010 /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
1011 GST_PAD_STREAM_LOCK (parse->srcpad);
1012 GST_PAD_STREAM_UNLOCK (parse->srcpad);
1016 case GST_EVENT_FLUSH_STOP:
1017 gst_adapter_clear (parse->priv->adapter);
1018 gst_base_parse_clear_queues (parse);
1019 parse->priv->flushing = FALSE;
1020 parse->priv->discont = TRUE;
1021 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1025 if (parse->segment.rate > 0.0)
1026 gst_base_parse_drain (parse);
1028 gst_base_parse_process_fragment (parse, FALSE);
1030 /* If we STILL have zero frames processed, fire an error */
1031 if (parse->priv->framecount == 0) {
1032 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1033 ("No valid frames found before end of stream"), (NULL));
1035 /* newsegment before eos */
1036 if (parse->priv->pending_segment) {
1037 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
1038 parse->priv->pending_segment = NULL;
1050 /* gst_base_parse_src_event:
1051 * @pad: #GstPad that received the event.
1052 * @event: #GstEvent that was received.
1054 * Handler for source pad events.
1056 * Returns: TRUE if the event was handled.
1059 gst_base_parse_src_event (GstPad * pad, GstEvent * event)
1061 GstBaseParse *parse;
1062 GstBaseParseClass *bclass;
1063 gboolean handled = FALSE;
1064 gboolean ret = TRUE;
1066 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
1067 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1069 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1070 GST_EVENT_TYPE_NAME (event));
1072 if (bclass->src_event)
1073 handled = bclass->src_event (parse, event);
1076 ret = gst_pad_event_default (pad, event);
1078 gst_object_unref (parse);
1083 gst_base_parse_is_seekable (GstBaseParse * parse)
1085 /* FIXME: could do more here, e.g. check index or just send data from 0
1086 * in pull mode and let decoder/sink clip */
1087 return parse->priv->syncable;
1090 /* gst_base_parse_src_eventfunc:
1091 * @parse: #GstBaseParse.
1092 * @event: #GstEvent that was received.
1094 * Default srcpad event handler.
1096 * Returns: TRUE if the event was handled and can be dropped.
1099 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1101 gboolean handled = FALSE;
1103 switch (GST_EVENT_TYPE (event)) {
1104 case GST_EVENT_SEEK:
1106 if (gst_base_parse_is_seekable (parse)) {
1107 handled = gst_base_parse_handle_seek (parse, event);
1119 * gst_base_parse_convert_default:
1120 * @parse: #GstBaseParse.
1121 * @src_format: #GstFormat describing the source format.
1122 * @src_value: Source value to be converted.
1123 * @dest_format: #GstFormat defining the converted format.
1124 * @dest_value: Pointer where the conversion result will be put.
1126 * Default implementation of "convert" vmethod in #GstBaseParse class.
1128 * Returns: TRUE if conversion was successful.
1133 gst_base_parse_convert_default (GstBaseParse * parse,
1134 GstFormat src_format,
1135 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1137 gboolean ret = FALSE;
1138 guint64 bytes, duration;
1140 if (G_UNLIKELY (src_format == dest_format)) {
1141 *dest_value = src_value;
1145 if (G_UNLIKELY (src_value == -1)) {
1150 if (G_UNLIKELY (src_value == 0)) {
1155 /* need at least some frames */
1156 if (!parse->priv->framecount)
1159 duration = parse->priv->acc_duration / GST_MSECOND;
1160 bytes = parse->priv->bytecount;
1162 if (G_UNLIKELY (!duration || !bytes))
1165 if (src_format == GST_FORMAT_BYTES) {
1166 if (dest_format == GST_FORMAT_TIME) {
1167 /* BYTES -> TIME conversion */
1168 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1169 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1170 *dest_value *= GST_MSECOND;
1171 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1172 *dest_value / GST_MSECOND);
1175 } else if (src_format == GST_FORMAT_TIME) {
1176 if (dest_format == GST_FORMAT_BYTES) {
1177 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1178 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1180 GST_DEBUG_OBJECT (parse,
1181 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1182 src_value / GST_MSECOND, *dest_value);
1185 } else if (src_format == GST_FORMAT_DEFAULT) {
1186 /* DEFAULT == frame-based */
1187 if (dest_format == GST_FORMAT_TIME) {
1188 if (parse->priv->fps_den) {
1189 *dest_value = gst_util_uint64_scale (src_value,
1190 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1193 } else if (dest_format == GST_FORMAT_BYTES) {
1201 gst_base_parse_update_duration (GstBaseParse * baseparse)
1204 GstBaseParse *parse;
1206 parse = GST_BASE_PARSE (baseparse);
1208 peer = gst_pad_get_peer (parse->sinkpad);
1210 GstFormat pformat = GST_FORMAT_BYTES;
1211 gboolean qres = FALSE;
1212 gint64 ptot, dest_value;
1214 qres = gst_pad_query_duration (peer, &pformat, &ptot);
1215 gst_object_unref (GST_OBJECT (peer));
1217 if (gst_base_parse_convert (parse, pformat, ptot,
1218 GST_FORMAT_TIME, &dest_value)) {
1219 parse->priv->estimated_duration = dest_value;
1220 GST_LOG_OBJECT (parse,
1221 "updated estimated duration to %" GST_TIME_FORMAT,
1222 GST_TIME_ARGS (dest_value));
1229 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1230 gboolean post_avg, gboolean post_max)
1232 GstTagList *taglist = gst_tag_list_new ();
1234 if (post_min && parse->priv->post_min_bitrate)
1235 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1236 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1238 if (post_avg && parse->priv->post_avg_bitrate) {
1239 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1240 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1241 parse->priv->avg_bitrate, NULL);
1244 if (post_max && parse->priv->post_max_bitrate)
1245 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1246 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1248 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1249 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1250 parse->priv->max_bitrate);
1252 gst_element_found_tags_for_pad (GST_ELEMENT (parse), parse->srcpad, taglist);
1255 /* gst_base_parse_update_bitrates:
1256 * @parse: #GstBaseParse.
1257 * @buffer: Current frame as a #GstBuffer
1259 * Keeps track of the minimum and maximum bitrates, and also maintains a
1260 * running average bitrate of the stream so far.
1263 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1265 /* Only update the tag on a 10 kbps delta */
1266 static const gint update_threshold = 10000;
1268 guint64 data_len, frame_dur;
1269 gint overhead, frame_bitrate, old_avg_bitrate;
1270 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1271 GstBuffer *buffer = frame->buffer;
1273 overhead = frame->overhead;
1277 data_len = GST_BUFFER_SIZE (buffer) - overhead;
1278 parse->priv->data_bytecount += data_len;
1280 /* duration should be valid by now,
1281 * either set by subclass or maybe based on fps settings */
1282 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1283 /* Calculate duration of a frame from buffer properties */
1284 frame_dur = GST_BUFFER_DURATION (buffer);
1285 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1286 parse->priv->acc_duration;
1289 /* No way to figure out frame duration (is this even possible?) */
1293 /* override if subclass provided bitrate, e.g. metadata based */
1294 if (parse->priv->bitrate) {
1295 parse->priv->avg_bitrate = parse->priv->bitrate;
1296 /* spread this (confirmed) info ASAP */
1297 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1298 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1302 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1306 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1307 parse->priv->avg_bitrate);
1309 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1311 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1312 /* always post all at threshold time */
1313 update_min = update_max = update_avg = TRUE;
1316 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1317 if (frame_bitrate < parse->priv->min_bitrate) {
1318 parse->priv->min_bitrate = frame_bitrate;
1322 if (frame_bitrate > parse->priv->max_bitrate) {
1323 parse->priv->max_bitrate = frame_bitrate;
1327 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1328 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1329 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1334 if ((update_min || update_avg || update_max))
1335 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1337 /* If average bitrate changes that much and no valid (time) duration provided,
1338 * then post a new duration message so applications can update their cached
1340 if (update_avg && !(parse->priv->duration_fmt == GST_FORMAT_TIME &&
1341 GST_CLOCK_TIME_IS_VALID (parse->priv->duration)))
1342 gst_element_post_message (GST_ELEMENT (parse),
1343 gst_message_new_duration (GST_OBJECT (parse), GST_FORMAT_TIME, -1));
1350 * gst_base_parse_add_index_entry:
1351 * @parse: #GstBaseParse.
1352 * @offset: offset of entry
1353 * @ts: timestamp associated with offset
1354 * @key: whether entry refers to keyframe
1355 * @force: add entry disregarding sanity checks
1357 * Adds an entry to the index associating @offset to @ts. It is recommended
1358 * to only add keyframe entries. @force allows to bypass checks, such as
1359 * whether the stream is (upstream) seekable, another entry is already "close"
1360 * to the new entry, etc.
1362 * Returns: #gboolean indicating whether entry was added
1367 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1368 GstClockTime ts, gboolean key, gboolean force)
1370 gboolean ret = FALSE;
1371 GstIndexAssociation associations[2];
1373 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1374 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1376 if (G_LIKELY (!force)) {
1378 if (!parse->priv->upstream_seekable) {
1379 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1383 /* FIXME need better helper data structure that handles these issues
1384 * related to ongoing collecting of index entries */
1385 if (parse->priv->index_last_offset >= (gint64) offset) {
1386 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1387 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1391 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1392 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1393 parse->priv->idx_interval) {
1394 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1395 GST_TIME_ARGS (parse->priv->index_last_ts));
1399 /* if last is not really the last one */
1400 if (!parse->priv->index_last_valid) {
1401 GstClockTime prev_ts;
1403 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1404 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1405 GST_DEBUG_OBJECT (parse,
1406 "entry too close to existing entry %" GST_TIME_FORMAT,
1407 GST_TIME_ARGS (prev_ts));
1408 parse->priv->index_last_offset = offset;
1409 parse->priv->index_last_ts = ts;
1415 associations[0].format = GST_FORMAT_TIME;
1416 associations[0].value = ts;
1417 associations[1].format = GST_FORMAT_BYTES;
1418 associations[1].value = offset;
1420 /* index might change on-the-fly, although that would be nutty app ... */
1421 GST_OBJECT_LOCK (parse);
1422 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1423 (key) ? GST_ASSOCIATION_FLAG_KEY_UNIT : GST_ASSOCIATION_FLAG_DELTA_UNIT,
1424 2, (const GstIndexAssociation *) &associations);
1425 GST_OBJECT_UNLOCK (parse);
1428 parse->priv->index_last_offset = offset;
1429 parse->priv->index_last_ts = ts;
1438 /* check for seekable upstream, above and beyond a mere query */
1440 gst_base_parse_check_seekability (GstBaseParse * parse)
1443 gboolean seekable = FALSE;
1444 gint64 start = -1, stop = -1;
1445 guint idx_interval = 0;
1447 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1448 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1449 GST_DEBUG_OBJECT (parse, "seeking query failed");
1453 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1455 /* try harder to query upstream size if we didn't get it the first time */
1456 if (seekable && stop == -1) {
1457 GstFormat fmt = GST_FORMAT_BYTES;
1459 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1460 gst_pad_query_peer_duration (parse->sinkpad, &fmt, &stop);
1463 /* if upstream doesn't know the size, it's likely that it's not seekable in
1464 * practice even if it technically may be seekable */
1465 if (seekable && (start != 0 || stop <= start)) {
1466 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1470 /* let's not put every single frame into our index */
1472 if (stop < 10 * 1024 * 1024)
1474 else if (stop < 100 * 1024 * 1024)
1477 idx_interval = 1000;
1481 gst_query_unref (query);
1483 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1484 G_GUINT64_FORMAT ")", seekable, start, stop);
1485 parse->priv->upstream_seekable = seekable;
1486 parse->priv->upstream_size = seekable ? stop : 0;
1488 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1489 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1492 /* some misc checks on upstream */
1494 gst_base_parse_check_upstream (GstBaseParse * parse)
1496 GstFormat fmt = GST_FORMAT_TIME;
1499 if (gst_pad_query_peer_duration (parse->sinkpad, &fmt, &stop))
1500 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1501 /* upstream has one, accept it also, and no further updates */
1502 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1503 parse->priv->upstream_has_duration = TRUE;
1506 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1507 parse->priv->upstream_has_duration);
1510 /* checks src caps to determine if dealing with audio or video */
1511 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1513 gst_base_parse_check_media (GstBaseParse * parse)
1518 caps = GST_PAD_CAPS (parse->srcpad);
1519 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1520 parse->priv->is_video =
1521 g_str_has_prefix (gst_structure_get_name (s), "video");
1523 /* historical default */
1524 parse->priv->is_video = FALSE;
1527 GST_DEBUG_OBJECT (parse, "media is video == %d", parse->priv->is_video);
1530 /* takes ownership of frame */
1532 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1534 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1535 /* frame allocated on the heap, we can just take ownership */
1536 g_queue_push_tail (&parse->priv->queued_frames, frame);
1537 GST_TRACE ("queued frame %p", frame);
1539 GstBaseParseFrame *copy;
1541 /* probably allocated on the stack, must make a proper copy */
1542 copy = gst_base_parse_frame_copy (frame);
1543 g_queue_push_tail (&parse->priv->queued_frames, copy);
1544 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1545 gst_base_parse_frame_free (frame);
1549 /* gst_base_parse_handle_and_push_buffer:
1550 * @parse: #GstBaseParse.
1551 * @klass: #GstBaseParseClass.
1552 * @frame: (transfer full): a #GstBaseParseFrame
1554 * Parses the frame from given buffer and pushes it forward. Also performs
1555 * timestamp handling and checks the segment limits.
1557 * This is called with srcpad STREAM_LOCK held.
1559 * Returns: #GstFlowReturn
1561 static GstFlowReturn
1562 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1563 GstBaseParseClass * klass, GstBaseParseFrame * frame)
1569 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1571 buffer = frame->buffer;
1573 if (parse->priv->discont) {
1574 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1575 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1576 parse->priv->discont = FALSE;
1579 /* some one-time start-up */
1580 if (G_UNLIKELY (!parse->priv->framecount)) {
1581 gst_base_parse_check_seekability (parse);
1582 gst_base_parse_check_upstream (parse);
1585 GST_LOG_OBJECT (parse,
1586 "parsing frame at offset %" G_GUINT64_FORMAT
1587 " (%#" G_GINT64_MODIFIER "x) of size %d",
1588 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1589 GST_BUFFER_SIZE (buffer));
1591 /* use default handler to provide initial (upstream) metadata */
1592 gst_base_parse_parse_frame (parse, frame);
1594 /* store offset as it might get overwritten */
1595 offset = GST_BUFFER_OFFSET (buffer);
1596 ret = klass->parse_frame (parse, frame);
1598 buffer = frame->buffer;
1599 /* subclass must play nice */
1600 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1602 /* check if subclass/format can provide ts.
1603 * If so, that allows and enables extra seek and duration determining options */
1604 if (G_UNLIKELY (parse->priv->first_frame_offset < 0 && ret == GST_FLOW_OK)) {
1605 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1606 && parse->priv->pad_mode == GST_ACTIVATE_PULL) {
1607 parse->priv->first_frame_offset = offset;
1608 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1609 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1610 " for first frame at offset %" G_GINT64_FORMAT,
1611 GST_TIME_ARGS (parse->priv->first_frame_ts),
1612 parse->priv->first_frame_offset);
1613 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1615 GstClockTime last_ts = G_MAXINT64;
1617 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1618 gst_base_parse_locate_time (parse, &last_ts, &off);
1619 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1620 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1623 /* disable further checks */
1624 parse->priv->first_frame_offset = 0;
1628 /* again use default handler to add missing metadata;
1629 * we may have new information on frame properties */
1630 gst_base_parse_parse_frame (parse, frame);
1631 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1632 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1633 parse->priv->next_ts =
1634 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1636 /* we lost track, do not produce bogus time next time around
1637 * (probably means parser subclass has given up on parsing as well) */
1638 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1639 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1642 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1643 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1644 gst_base_parse_add_index_entry (parse, offset,
1645 GST_BUFFER_TIMESTAMP (buffer),
1646 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1648 /* First buffers are dropped, this means that the subclass needs more
1649 * frames to decide on the format and queues them internally */
1650 /* convert internal flow to OK and mark discont for the next buffer. */
1651 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1652 gst_base_parse_frame_free (frame);
1654 } else if (ret == GST_BASE_PARSE_FLOW_QUEUED) {
1655 gst_base_parse_queue_frame (parse, frame);
1657 } else if (ret != GST_FLOW_OK) {
1661 /* All OK, push queued frames if there are any */
1662 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1663 GstBaseParseFrame *queued_frame;
1665 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1666 queued_frame->buffer =
1667 gst_buffer_make_metadata_writable (queued_frame->buffer);
1668 gst_buffer_set_caps (queued_frame->buffer,
1669 GST_PAD_CAPS (GST_BASE_PARSE_SRC_PAD (parse)));
1670 gst_base_parse_push_frame (parse, queued_frame);
1671 gst_base_parse_frame_free (queued_frame);
1675 return gst_base_parse_push_frame (parse, frame);
1679 * gst_base_parse_push_frame:
1680 * @parse: #GstBaseParse.
1681 * @frame: (transfer full): a #GstBaseParseFrame
1683 * Pushes the frame downstream, sends any pending events and
1684 * does some timestamp and segment handling. Takes ownership
1685 * of @frame and will clear it (if it was initialised with
1686 * gst_base_parse_frame_init()) or free it.
1688 * This must be called with sinkpad STREAM_LOCK held.
1690 * Returns: #GstFlowReturn
1695 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1697 GstFlowReturn ret = GST_FLOW_OK;
1698 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1699 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1700 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1703 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1704 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1706 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1708 buffer = frame->buffer;
1710 GST_LOG_OBJECT (parse,
1711 "processing buffer of size %d with ts %" GST_TIME_FORMAT
1712 ", duration %" GST_TIME_FORMAT, GST_BUFFER_SIZE (buffer),
1713 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1714 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1717 parse->priv->bytecount += GST_BUFFER_SIZE (buffer);
1718 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1719 parse->priv->framecount++;
1720 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1721 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1724 /* 0 means disabled */
1725 if (parse->priv->update_interval < 0)
1726 parse->priv->update_interval = 50;
1727 else if (parse->priv->update_interval > 0 &&
1728 (parse->priv->framecount % parse->priv->update_interval) == 0)
1729 gst_base_parse_update_duration (parse);
1731 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1732 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1733 if (last_start != GST_CLOCK_TIME_NONE
1734 && GST_BUFFER_DURATION_IS_VALID (buffer))
1735 last_stop = last_start + GST_BUFFER_DURATION (buffer);
1737 /* should have caps by now */
1738 g_return_val_if_fail (GST_PAD_CAPS (parse->srcpad), GST_FLOW_ERROR);
1740 /* segment adjustment magic; only if we are running the whole show */
1741 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
1742 (parse->priv->pad_mode == GST_ACTIVATE_PULL ||
1743 parse->priv->upstream_seekable)) {
1744 /* segment times are typically estimates,
1745 * actual frame data might lead subclass to different timestamps,
1746 * so override segment start from what is supplied there */
1747 if (G_UNLIKELY (parse->priv->pending_segment && !parse->priv->exact_position
1748 && GST_CLOCK_TIME_IS_VALID (last_start))) {
1749 gst_event_unref (parse->priv->pending_segment);
1750 parse->segment.start =
1751 MIN ((guint64) last_start, (guint64) parse->segment.stop);
1752 GST_DEBUG_OBJECT (parse,
1753 "adjusting pending segment start to %" GST_TIME_FORMAT,
1754 GST_TIME_ARGS (parse->segment.start));
1755 parse->priv->pending_segment =
1756 gst_event_new_new_segment (FALSE, parse->segment.rate,
1757 parse->segment.format, parse->segment.start,
1758 parse->segment.stop, parse->segment.start);
1760 /* handle gaps, e.g. non-zero start-time, in as much not handled by above */
1761 if (GST_CLOCK_TIME_IS_VALID (parse->segment.last_stop) &&
1762 GST_CLOCK_TIME_IS_VALID (last_start)) {
1763 GstClockTimeDiff diff;
1765 /* only send newsegments with increasing start times,
1766 * otherwise if these go back and forth downstream (sinks) increase
1767 * accumulated time and running_time */
1768 diff = GST_CLOCK_DIFF (parse->segment.last_stop, last_start);
1769 if (G_UNLIKELY (diff > 2 * GST_SECOND
1770 && last_start > parse->segment.start
1771 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
1772 || last_start < parse->segment.stop))) {
1773 GST_DEBUG_OBJECT (parse,
1774 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
1775 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
1776 "Sending updated NEWSEGMENT events", diff,
1777 GST_TIME_ARGS (parse->segment.last_stop),
1778 GST_TIME_ARGS (last_start));
1779 if (G_UNLIKELY (parse->priv->pending_segment)) {
1780 gst_event_unref (parse->priv->pending_segment);
1781 parse->segment.start = last_start;
1782 parse->priv->pending_segment =
1783 gst_event_new_new_segment (FALSE, parse->segment.rate,
1784 parse->segment.format, parse->segment.start,
1785 parse->segment.stop, parse->segment.start);
1787 /* send newsegment events such that the gap is not accounted in
1788 * accum time, hence running_time */
1789 /* close ahead of gap */
1790 gst_pad_push_event (parse->srcpad,
1791 gst_event_new_new_segment (TRUE, parse->segment.rate,
1792 parse->segment.format, parse->segment.last_stop,
1793 parse->segment.last_stop, parse->segment.last_stop));
1795 gst_pad_push_event (parse->srcpad,
1796 gst_event_new_new_segment (FALSE, parse->segment.rate,
1797 parse->segment.format, last_start,
1798 parse->segment.stop, last_start));
1800 /* align segment view with downstream,
1801 * prevents double-counting accum when closing segment */
1802 gst_segment_set_newsegment (&parse->segment, FALSE,
1803 parse->segment.rate, parse->segment.format, last_start,
1804 parse->segment.stop, last_start);
1805 parse->segment.last_stop = last_start;
1810 /* and should then also be linked downstream, so safe to send some events */
1811 if (G_UNLIKELY (parse->priv->close_segment)) {
1812 /* only set up by loop */
1813 GST_DEBUG_OBJECT (parse, "loop sending close segment");
1814 gst_pad_push_event (parse->srcpad, parse->priv->close_segment);
1815 parse->priv->close_segment = NULL;
1817 if (G_UNLIKELY (parse->priv->pending_segment)) {
1818 GST_DEBUG_OBJECT (parse, "%s push pending segment",
1819 parse->priv->pad_mode == GST_ACTIVATE_PULL ? "loop" : "chain");
1820 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
1821 parse->priv->pending_segment = NULL;
1823 /* have caps; check identity */
1824 gst_base_parse_check_media (parse);
1827 /* update bitrates and optionally post corresponding tags
1828 * (following newsegment) */
1829 gst_base_parse_update_bitrates (parse, frame);
1831 if (G_UNLIKELY (parse->priv->pending_events)) {
1834 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
1835 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
1837 g_list_free (parse->priv->pending_events);
1838 parse->priv->pending_events = NULL;
1841 if (klass->pre_push_frame) {
1842 ret = klass->pre_push_frame (parse, frame);
1844 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
1847 /* take final ownership of frame buffer */
1848 buffer = frame->buffer;
1849 frame->buffer = NULL;
1851 /* subclass must play nice */
1852 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1855 buffer = gst_buffer_make_metadata_writable (buffer);
1856 gst_buffer_set_caps (buffer, GST_PAD_CAPS (parse->srcpad));
1858 parse->priv->seen_keyframe |= parse->priv->is_video &&
1859 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
1861 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
1862 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1863 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
1864 GST_BUFFER_TIMESTAMP (buffer) >
1865 parse->segment.stop + parse->priv->lead_out_ts) {
1866 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
1867 ret = GST_FLOW_UNEXPECTED;
1868 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1869 GST_BUFFER_DURATION_IS_VALID (buffer) &&
1870 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
1871 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
1872 parse->priv->lead_in_ts < parse->segment.start) {
1873 if (parse->priv->seen_keyframe) {
1874 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
1877 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
1878 ret = GST_BASE_PARSE_FLOW_DROPPED;
1885 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1886 GST_LOG_OBJECT (parse, "frame (%d bytes) dropped",
1887 GST_BUFFER_SIZE (buffer));
1888 gst_buffer_unref (buffer);
1890 } else if (ret == GST_FLOW_OK) {
1891 if (parse->segment.rate > 0.0) {
1892 ret = gst_pad_push (parse->srcpad, buffer);
1893 GST_LOG_OBJECT (parse, "frame (%d bytes) pushed: %s",
1894 GST_BUFFER_SIZE (buffer), gst_flow_get_name (ret));
1896 GST_LOG_OBJECT (parse, "frame (%d bytes) queued for now",
1897 GST_BUFFER_SIZE (buffer));
1898 parse->priv->buffers_queued =
1899 g_slist_prepend (parse->priv->buffers_queued, buffer);
1903 gst_buffer_unref (buffer);
1904 GST_LOG_OBJECT (parse, "frame (%d bytes) not pushed: %s",
1905 GST_BUFFER_SIZE (buffer), gst_flow_get_name (ret));
1906 /* if we are not sufficiently in control, let upstream decide on EOS */
1907 if (ret == GST_FLOW_UNEXPECTED &&
1908 (parse->priv->passthrough ||
1909 (parse->priv->pad_mode == GST_ACTIVATE_PUSH &&
1910 !parse->priv->upstream_seekable)))
1914 /* Update current running segment position */
1915 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
1916 parse->segment.last_stop < last_stop)
1917 gst_segment_set_last_stop (&parse->segment, GST_FORMAT_TIME, last_stop);
1919 gst_base_parse_frame_free (frame);
1925 /* gst_base_parse_drain:
1927 * Drains the adapter until it is empty. It decreases the min_frame_size to
1928 * match the current adapter size and calls chain method until the adapter
1929 * is emptied or chain returns with error.
1932 gst_base_parse_drain (GstBaseParse * parse)
1936 GST_DEBUG_OBJECT (parse, "draining");
1937 parse->priv->drain = TRUE;
1940 avail = gst_adapter_available (parse->priv->adapter);
1944 if (gst_base_parse_chain (parse->sinkpad, NULL) != GST_FLOW_OK) {
1948 /* nothing changed, maybe due to truncated frame; break infinite loop */
1949 if (avail == gst_adapter_available (parse->priv->adapter)) {
1950 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
1951 gst_adapter_clear (parse->priv->adapter);
1955 parse->priv->drain = FALSE;
1958 /* gst_base_parse_send_buffers
1960 * Sends buffers collected in send_buffers downstream, and ensures that list
1961 * is empty at the end (errors or not).
1963 static GstFlowReturn
1964 gst_base_parse_send_buffers (GstBaseParse * parse)
1966 GSList *send = NULL;
1968 GstFlowReturn ret = GST_FLOW_OK;
1970 send = parse->priv->buffers_send;
1974 buf = GST_BUFFER_CAST (send->data);
1975 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
1976 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
1977 ", offset %" G_GINT64_FORMAT, buf,
1978 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
1979 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
1981 /* iterate output queue an push downstream */
1982 ret = gst_pad_push (parse->srcpad, buf);
1983 send = g_slist_delete_link (send, send);
1985 /* clear any leftover if error */
1986 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
1988 buf = GST_BUFFER_CAST (send->data);
1989 gst_buffer_unref (buf);
1990 send = g_slist_delete_link (send, send);
1995 parse->priv->buffers_send = send;
2000 /* gst_base_parse_process_fragment:
2002 * Processes a reverse playback (forward) fragment:
2003 * - append head of last fragment that was skipped to current fragment data
2004 * - drain the resulting current fragment data (i.e. repeated chain)
2005 * - add time/duration (if needed) to frames queued by chain
2006 * - push queued data
2008 static GstFlowReturn
2009 gst_base_parse_process_fragment (GstBaseParse * parse, gboolean push_only)
2012 GstFlowReturn ret = GST_FLOW_OK;
2013 gboolean seen_key = FALSE, seen_delta = FALSE;
2019 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2020 while (parse->priv->buffers_pending) {
2021 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2022 GST_LOG_OBJECT (parse, "adding pending buffer (size %d)",
2023 GST_BUFFER_SIZE (buf));
2024 gst_adapter_push (parse->priv->adapter, buf);
2025 parse->priv->buffers_pending =
2026 g_slist_delete_link (parse->priv->buffers_pending,
2027 parse->priv->buffers_pending);
2030 /* invalidate so no fall-back timestamping is performed;
2031 * ok if taken from subclass or upstream */
2032 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2033 /* prevent it hanging around stop all the time */
2034 parse->segment.last_stop = GST_CLOCK_TIME_NONE;
2036 parse->priv->discont = TRUE;
2038 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2039 /* initial skipped data is added to buffers_pending */
2040 gst_base_parse_drain (parse);
2043 if (parse->priv->buffers_send) {
2044 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2045 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2048 /* add metadata (if needed to queued buffers */
2049 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2050 GST_TIME_ARGS (parse->priv->last_ts));
2051 while (parse->priv->buffers_queued) {
2052 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2054 /* no touching if upstream or parsing provided time */
2055 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2056 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2057 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2058 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2059 GST_BUFFER_DURATION_IS_VALID (buf)) {
2060 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2061 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2063 parse->priv->last_ts = 0;
2064 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2065 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2066 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2068 /* no idea, very bad */
2069 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2072 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2074 /* reverse order for ascending sending */
2075 /* send downstream at keyframe not preceded by a keyframe
2076 * (e.g. that should identify start of collection of IDR nals) */
2077 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2079 ret = gst_base_parse_send_buffers (parse);
2080 /* if a problem, throw all to sending */
2081 if (ret != GST_FLOW_OK) {
2082 parse->priv->buffers_send =
2083 g_slist_reverse (parse->priv->buffers_queued);
2084 parse->priv->buffers_queued = NULL;
2093 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2095 parse->priv->buffers_send =
2096 g_slist_prepend (parse->priv->buffers_send, buf);
2097 parse->priv->buffers_queued =
2098 g_slist_delete_link (parse->priv->buffers_queued,
2099 parse->priv->buffers_queued);
2102 /* audio may have all marked as keyframe, so arrange to send here */
2104 ret = gst_base_parse_send_buffers (parse);
2106 /* any trailing unused no longer usable (ideally none) */
2107 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2108 GST_DEBUG_OBJECT (parse, "discarding %d trailing bytes",
2109 gst_adapter_available (parse->priv->adapter));
2110 gst_adapter_clear (parse->priv->adapter);
2116 /* small helper that checks whether we have been trying to resync too long */
2117 static inline GstFlowReturn
2118 gst_base_parse_check_sync (GstBaseParse * parse)
2120 if (G_UNLIKELY (parse->priv->discont &&
2121 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2122 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2123 ("Failed to parse stream"), (NULL));
2124 return GST_FLOW_ERROR;
2130 static GstFlowReturn
2131 gst_base_parse_chain (GstPad * pad, GstBuffer * buffer)
2133 GstBaseParseClass *bclass;
2134 GstBaseParse *parse;
2135 GstFlowReturn ret = GST_FLOW_OK;
2136 GstBuffer *outbuf = NULL;
2137 GstBuffer *tmpbuf = NULL;
2141 guint old_min_size = 0, min_size, av;
2142 GstClockTime timestamp;
2143 GstBaseParseFrame _frame;
2144 GstBaseParseFrame *frame;
2146 parse = GST_BASE_PARSE (GST_OBJECT_PARENT (pad));
2147 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2150 gst_base_parse_frame_init (frame);
2152 if (G_LIKELY (buffer)) {
2153 GST_LOG_OBJECT (parse, "buffer size: %d, offset = %" G_GINT64_FORMAT,
2154 GST_BUFFER_SIZE (buffer), GST_BUFFER_OFFSET (buffer));
2155 if (G_UNLIKELY (parse->priv->passthrough)) {
2156 frame->buffer = gst_buffer_make_metadata_writable (buffer);
2157 return gst_base_parse_push_frame (parse, frame);
2159 /* upstream feeding us in reverse playback;
2160 * gather each fragment, then process it in single run */
2161 if (parse->segment.rate < 0.0) {
2162 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2163 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2164 ret = gst_base_parse_process_fragment (parse, FALSE);
2166 gst_adapter_push (parse->priv->adapter, buffer);
2169 gst_adapter_push (parse->priv->adapter, buffer);
2172 /* Parse and push as many frames as possible */
2173 /* Stop either when adapter is empty or we are flushing */
2174 while (!parse->priv->flushing) {
2177 tmpbuf = gst_buffer_new ();
2180 /* Synchronization loop */
2182 min_size = MAX (parse->priv->min_frame_size, fsize);
2183 av = gst_adapter_available (parse->priv->adapter);
2185 /* loop safety check */
2186 if (G_UNLIKELY (old_min_size >= min_size))
2188 old_min_size = min_size;
2190 if (G_UNLIKELY (parse->priv->drain)) {
2192 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2193 if (G_UNLIKELY (!min_size)) {
2194 gst_buffer_unref (tmpbuf);
2199 /* Collect at least min_frame_size bytes */
2200 if (av < min_size) {
2201 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)",
2203 gst_buffer_unref (tmpbuf);
2207 /* always pass all available data */
2208 data = gst_adapter_peek (parse->priv->adapter, av);
2209 GST_BUFFER_DATA (tmpbuf) = (guint8 *) data;
2210 GST_BUFFER_SIZE (tmpbuf) = min_size;
2211 GST_BUFFER_OFFSET (tmpbuf) = parse->priv->offset;
2212 GST_BUFFER_FLAG_SET (tmpbuf, GST_MINI_OBJECT_FLAG_READONLY);
2214 if (parse->priv->discont) {
2215 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2216 GST_BUFFER_FLAG_SET (tmpbuf, GST_BUFFER_FLAG_DISCONT);
2220 gst_base_parse_frame_update (parse, frame, tmpbuf);
2221 res = bclass->check_valid_frame (parse, frame, &fsize, &skip);
2222 gst_buffer_replace (&frame->buffer, NULL);
2224 if (gst_adapter_available (parse->priv->adapter) < fsize) {
2225 GST_DEBUG_OBJECT (parse,
2226 "found valid frame but not enough data available (only %d bytes)",
2227 gst_adapter_available (parse->priv->adapter));
2228 gst_buffer_unref (tmpbuf);
2231 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2235 /* subclass didn't touch this value. By default we skip 1 byte */
2239 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2240 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2241 /* reverse playback, and no frames found yet, so we are skipping
2242 * the leading part of a fragment, which may form the tail of
2243 * fragment coming later, hopefully subclass skips efficiently ... */
2244 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2245 outbuf = gst_adapter_take_buffer (parse->priv->adapter, skip);
2246 outbuf = gst_buffer_make_metadata_writable (outbuf);
2247 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
2248 parse->priv->buffers_pending =
2249 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2252 gst_adapter_flush (parse->priv->adapter, skip);
2254 parse->priv->offset += skip;
2255 if (!parse->priv->discont)
2256 parse->priv->sync_offset = parse->priv->offset;
2257 parse->priv->discont = TRUE;
2258 /* something changed least; nullify loop check */
2261 /* skip == 0 should imply subclass set min_size to need more data;
2262 * we check this shortly */
2263 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2264 gst_buffer_unref (tmpbuf);
2268 gst_buffer_unref (tmpbuf);
2272 /* Subclass found the sync, but still wants to skip some data */
2273 GST_LOG_OBJECT (parse, "skipping %d bytes", skip);
2274 gst_adapter_flush (parse->priv->adapter, skip);
2275 parse->priv->offset += skip;
2278 /* Grab lock to prevent a race with FLUSH_START handler */
2279 GST_PAD_STREAM_LOCK (parse->srcpad);
2281 /* FLUSH_START event causes the "flushing" flag to be set. In this
2282 * case we can leave the frame pushing loop */
2283 if (parse->priv->flushing) {
2284 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2288 /* move along with upstream timestamp (if any),
2289 * but interpolate in between */
2290 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2291 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2292 (parse->priv->prev_ts != timestamp)) {
2293 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2296 /* FIXME: Would it be more efficient to make a subbuffer instead? */
2297 outbuf = gst_adapter_take_buffer (parse->priv->adapter, fsize);
2298 outbuf = gst_buffer_make_metadata_writable (outbuf);
2300 /* Subclass may want to know the data offset */
2301 GST_BUFFER_OFFSET (outbuf) = parse->priv->offset;
2302 parse->priv->offset += fsize;
2303 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2304 GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
2306 frame->buffer = outbuf;
2307 ret = gst_base_parse_handle_and_push_frame (parse, bclass, frame);
2308 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2310 if (ret != GST_FLOW_OK) {
2311 GST_LOG_OBJECT (parse, "push returned %d", ret);
2317 GST_LOG_OBJECT (parse, "chain leaving");
2323 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2324 ("min_size evolution %d -> %d; breaking to avoid looping",
2325 old_min_size, min_size));
2326 return GST_FLOW_ERROR;
2330 /* pull @size bytes at current offset,
2331 * i.e. at least try to and possibly return a shorter buffer if near the end */
2332 static GstFlowReturn
2333 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2334 GstBuffer ** buffer)
2336 GstFlowReturn ret = GST_FLOW_OK;
2338 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2340 /* Caching here actually makes much less difference than one would expect.
2341 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2342 if (parse->priv->cache) {
2343 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2344 gint cache_size = GST_BUFFER_SIZE (parse->priv->cache);
2346 if (cache_offset <= parse->priv->offset &&
2347 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2348 *buffer = gst_buffer_create_sub (parse->priv->cache,
2349 parse->priv->offset - cache_offset, size);
2350 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2353 /* not enough data in the cache, free cache and get a new one */
2354 gst_buffer_unref (parse->priv->cache);
2355 parse->priv->cache = NULL;
2358 /* refill the cache */
2360 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2361 64 * 1024), &parse->priv->cache);
2362 if (ret != GST_FLOW_OK) {
2363 parse->priv->cache = NULL;
2367 if (GST_BUFFER_SIZE (parse->priv->cache) >= size) {
2368 *buffer = gst_buffer_create_sub (parse->priv->cache, 0, size);
2369 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2373 /* Not possible to get enough data, try a last time with
2374 * requesting exactly the size we need */
2375 gst_buffer_unref (parse->priv->cache);
2376 parse->priv->cache = NULL;
2378 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2379 &parse->priv->cache);
2381 if (ret != GST_FLOW_OK) {
2382 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2387 if (GST_BUFFER_SIZE (parse->priv->cache) < size) {
2388 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2389 G_GUINT64_FORMAT ": wanted %u bytes, got %u bytes", parse->priv->offset,
2390 size, GST_BUFFER_SIZE (parse->priv->cache));
2392 *buffer = parse->priv->cache;
2393 parse->priv->cache = NULL;
2398 *buffer = gst_buffer_create_sub (parse->priv->cache, 0, size);
2399 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2404 static GstFlowReturn
2405 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2408 GstClockTime ts = 0;
2412 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2413 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2414 parse->priv->last_offset);
2416 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2417 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2418 GST_TIME_ARGS (parse->segment.start));
2419 ret = GST_FLOW_UNEXPECTED;
2423 /* last fragment started at last_offset / last_ts;
2424 * seek back 10s capped at 1MB */
2425 if (parse->priv->last_ts >= 10 * GST_SECOND)
2426 ts = parse->priv->last_ts - 10 * GST_SECOND;
2427 /* if we are exact now, we will be more so going backwards */
2428 if (parse->priv->exact_position) {
2429 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2431 GstFormat dstformat = GST_FORMAT_BYTES;
2433 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2434 &dstformat, &offset)) {
2435 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2438 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2439 parse->priv->last_offset - 1024);
2440 offset = MAX (0, offset);
2442 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2444 parse->priv->offset = offset;
2446 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2448 if (ret != GST_FLOW_OK)
2451 /* offset will increase again as fragment is processed/parsed */
2452 parse->priv->last_offset = offset;
2454 gst_adapter_push (parse->priv->adapter, buffer);
2455 ret = gst_base_parse_process_fragment (parse, FALSE);
2456 if (ret != GST_FLOW_OK)
2459 /* force previous fragment */
2460 parse->priv->offset = -1;
2467 * pull and scan for next frame starting from current offset
2468 * ajusts sync, drain and offset going along */
2469 static GstFlowReturn
2470 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2471 GstBaseParseFrame * frame, gboolean full)
2473 GstBuffer *buffer, *outbuf;
2474 GstFlowReturn ret = GST_FLOW_OK;
2475 guint fsize = 1, min_size, old_min_size = 0;
2478 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2480 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2481 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2486 min_size = MAX (parse->priv->min_frame_size, fsize);
2487 /* loop safety check */
2488 if (G_UNLIKELY (old_min_size >= min_size))
2490 old_min_size = min_size;
2492 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2493 if (ret != GST_FLOW_OK)
2496 if (parse->priv->discont) {
2497 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2498 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
2501 /* if we got a short read, inform subclass we are draining leftover
2502 * and no more is to be expected */
2503 if (GST_BUFFER_SIZE (buffer) < min_size)
2504 parse->priv->drain = TRUE;
2507 gst_base_parse_frame_update (parse, frame, buffer);
2508 res = klass->check_valid_frame (parse, frame, &fsize, &skip);
2509 gst_buffer_replace (&frame->buffer, NULL);
2511 parse->priv->drain = FALSE;
2512 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2515 parse->priv->drain = FALSE;
2519 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2520 if (full && parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2521 /* reverse playback, and no frames found yet, so we are skipping
2522 * the leading part of a fragment, which may form the tail of
2523 * fragment coming later, hopefully subclass skips efficiently ... */
2524 outbuf = gst_buffer_create_sub (buffer, 0, skip);
2525 parse->priv->buffers_pending =
2526 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2529 parse->priv->offset += skip;
2530 if (!parse->priv->discont)
2531 parse->priv->sync_offset = parse->priv->offset;
2532 parse->priv->discont = TRUE;
2533 /* something changed least; nullify loop check */
2536 /* skip == 0 should imply subclass set min_size to need more data;
2537 * we check this shortly */
2538 GST_DEBUG_OBJECT (parse, "finding sync...");
2539 gst_buffer_unref (buffer);
2540 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2545 /* Does the subclass want to skip too? */
2547 parse->priv->offset += skip;
2551 if (fsize + skip <= GST_BUFFER_SIZE (buffer)) {
2552 outbuf = gst_buffer_create_sub (buffer, skip, fsize);
2553 GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer) + skip;
2554 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2555 gst_buffer_unref (buffer);
2557 gst_buffer_unref (buffer);
2558 ret = gst_base_parse_pull_range (parse, fsize, &outbuf);
2559 if (ret != GST_FLOW_OK)
2561 if (GST_BUFFER_SIZE (outbuf) < fsize) {
2562 gst_buffer_unref (outbuf);
2563 ret = GST_FLOW_UNEXPECTED;
2567 parse->priv->offset += fsize;
2569 frame->buffer = outbuf;
2577 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2578 ("min_size evolution %d -> %d; breaking to avoid looping",
2579 old_min_size, min_size));
2580 return GST_FLOW_ERROR;
2584 /* Loop that is used in pull mode to retrieve data from upstream */
2586 gst_base_parse_loop (GstPad * pad)
2588 GstBaseParse *parse;
2589 GstBaseParseClass *klass;
2590 GstFlowReturn ret = GST_FLOW_OK;
2591 GstBaseParseFrame frame;
2593 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2594 klass = GST_BASE_PARSE_GET_CLASS (parse);
2596 /* reverse playback:
2597 * first fragment (closest to stop time) is handled normally below,
2598 * then we pull in fragments going backwards */
2599 if (parse->segment.rate < 0.0) {
2600 /* check if we jumped back to a previous fragment,
2601 * which is a post-first fragment */
2602 if (parse->priv->offset < 0) {
2603 ret = gst_base_parse_handle_previous_fragment (parse);
2608 gst_base_parse_frame_init (&frame);
2609 ret = gst_base_parse_scan_frame (parse, klass, &frame, TRUE);
2610 if (ret != GST_FLOW_OK)
2613 /* This always cleans up frame, even if error occurs */
2614 ret = gst_base_parse_handle_and_push_frame (parse, klass, &frame);
2616 /* eat expected eos signalling past segment in reverse playback */
2617 if (parse->segment.rate < 0.0 && ret == GST_FLOW_UNEXPECTED &&
2618 parse->segment.last_stop >= parse->segment.stop) {
2619 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2620 /* push what was accumulated during loop run */
2621 gst_base_parse_process_fragment (parse, TRUE);
2622 /* force previous fragment */
2623 parse->priv->offset = -1;
2628 if (ret == GST_FLOW_UNEXPECTED)
2630 else if (ret != GST_FLOW_OK)
2633 gst_object_unref (parse);
2639 ret = GST_FLOW_UNEXPECTED;
2640 GST_DEBUG_OBJECT (parse, "eos");
2645 gboolean push_eos = FALSE;
2647 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2648 gst_flow_get_name (ret));
2649 gst_pad_pause_task (parse->sinkpad);
2651 if (ret == GST_FLOW_UNEXPECTED) {
2652 /* handle end-of-stream/segment */
2653 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2656 if ((stop = parse->segment.stop) == -1)
2657 stop = parse->segment.duration;
2659 GST_DEBUG_OBJECT (parse, "sending segment_done");
2661 gst_element_post_message
2662 (GST_ELEMENT_CAST (parse),
2663 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2664 GST_FORMAT_TIME, stop));
2666 /* If we STILL have zero frames processed, fire an error */
2667 if (parse->priv->framecount == 0) {
2668 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2669 ("No valid frames found before end of stream"), (NULL));
2673 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_UNEXPECTED) {
2674 /* for fatal errors we post an error message, wrong-state is
2675 * not fatal because it happens due to flushes and only means
2676 * that we should stop now. */
2677 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2678 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
2682 /* newsegment before eos */
2683 if (parse->priv->pending_segment) {
2684 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
2685 parse->priv->pending_segment = NULL;
2687 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
2689 gst_object_unref (parse);
2694 gst_base_parse_sink_activate (GstPad * sinkpad)
2696 GstBaseParse *parse;
2697 gboolean result = TRUE;
2699 parse = GST_BASE_PARSE (gst_pad_get_parent (sinkpad));
2701 GST_DEBUG_OBJECT (parse, "sink activate");
2703 if (gst_pad_check_pull_range (sinkpad)) {
2704 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
2705 result = gst_pad_activate_pull (sinkpad, TRUE);
2707 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
2708 result = gst_pad_activate_push (sinkpad, TRUE);
2711 GST_DEBUG_OBJECT (parse, "sink activate return %d", result);
2712 gst_object_unref (parse);
2717 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
2719 GstBaseParseClass *klass;
2720 gboolean result = FALSE;
2722 GST_DEBUG_OBJECT (parse, "activate %d", active);
2724 klass = GST_BASE_PARSE_GET_CLASS (parse);
2727 if (parse->priv->pad_mode == GST_ACTIVATE_NONE && klass->start)
2728 result = klass->start (parse);
2730 /* We must make sure streaming has finished before resetting things
2731 * and calling the ::stop vfunc */
2732 GST_PAD_STREAM_LOCK (parse->sinkpad);
2733 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
2735 if (parse->priv->pad_mode != GST_ACTIVATE_NONE && klass->stop)
2736 result = klass->stop (parse);
2738 parse->priv->pad_mode = GST_ACTIVATE_NONE;
2740 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
2745 gst_base_parse_sink_activate_push (GstPad * pad, gboolean active)
2747 gboolean result = TRUE;
2748 GstBaseParse *parse;
2750 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2752 GST_DEBUG_OBJECT (parse, "sink activate push %d", active);
2754 result = gst_base_parse_activate (parse, active);
2757 parse->priv->pad_mode = active ? GST_ACTIVATE_PUSH : GST_ACTIVATE_NONE;
2759 GST_DEBUG_OBJECT (parse, "sink activate push return: %d", result);
2761 gst_object_unref (parse);
2766 gst_base_parse_sink_activate_pull (GstPad * sinkpad, gboolean active)
2768 gboolean result = FALSE;
2769 GstBaseParse *parse;
2771 parse = GST_BASE_PARSE (gst_pad_get_parent (sinkpad));
2773 GST_DEBUG_OBJECT (parse, "activate pull %d", active);
2775 result = gst_base_parse_activate (parse, active);
2779 parse->priv->pending_segment = gst_event_new_new_segment (FALSE,
2780 parse->segment.rate, parse->segment.format,
2781 parse->segment.start, parse->segment.stop, parse->segment.last_stop);
2783 gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop,
2786 result &= gst_pad_stop_task (sinkpad);
2791 parse->priv->pad_mode = active ? GST_ACTIVATE_PULL : GST_ACTIVATE_NONE;
2793 GST_DEBUG_OBJECT (parse, "sink activate pull return: %d", result);
2795 gst_object_unref (parse);
2801 * gst_base_parse_set_duration:
2802 * @parse: #GstBaseParse.
2804 * @duration: duration value.
2805 * @interval: how often to update the duration estimate based on bitrate, or 0.
2807 * Sets the duration of the currently playing media. Subclass can use this
2808 * when it is able to determine duration and/or notices a change in the media
2809 * duration. Alternatively, if @interval is non-zero (default), then stream
2810 * duration is determined based on estimated bitrate, and updated every @interval
2816 gst_base_parse_set_duration (GstBaseParse * parse,
2817 GstFormat fmt, gint64 duration, gint interval)
2819 g_return_if_fail (parse != NULL);
2821 if (parse->priv->upstream_has_duration) {
2822 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
2826 if (duration != parse->priv->duration) {
2829 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
2830 gst_element_post_message (GST_ELEMENT (parse), m);
2832 /* TODO: what about duration tag? */
2834 parse->priv->duration = duration;
2835 parse->priv->duration_fmt = fmt;
2836 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
2837 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
2838 if (interval != 0) {
2839 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
2843 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
2844 parse->priv->update_interval = interval;
2850 * gst_base_parse_set_average_bitrate:
2851 * @parse: #GstBaseParse.
2852 * @bitrate: average bitrate in bits/second
2854 * Optionally sets the average bitrate detected in media (if non-zero),
2855 * e.g. based on metadata, as it will be posted to the application.
2857 * By default, announced average bitrate is estimated. The average bitrate
2858 * is used to estimate the total duration of the stream and to estimate
2859 * a seek position, if there's no index and #GST_BASE_PARSE_FORMAT_FLAG_SYNCABLE
2865 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
2867 parse->priv->bitrate = bitrate;
2868 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
2872 * gst_base_parse_set_min_frame_size:
2873 * @parse: #GstBaseParse.
2874 * @min_size: Minimum size of the data that this base class should give to
2877 * Subclass can use this function to tell the base class that it needs to
2878 * give at least #min_size buffers.
2883 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
2885 g_return_if_fail (parse != NULL);
2887 parse->priv->min_frame_size = min_size;
2888 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
2892 * gst_base_parse_set_frame_rate:
2893 * @parse: the #GstBaseParse to set
2894 * @fps_num: frames per second (numerator).
2895 * @fps_den: frames per second (denominator).
2896 * @lead_in: frames needed before a segment for subsequent decode
2897 * @lead_out: frames needed after a segment
2899 * If frames per second is configured, parser can take care of buffer duration
2900 * and timestamping. When performing segment clipping, or seeking to a specific
2901 * location, a corresponding decoder might need an initial @lead_in and a
2902 * following @lead_out number of frames to ensure the desired segment is
2903 * entirely filled upon decoding.
2908 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
2909 guint fps_den, guint lead_in, guint lead_out)
2911 g_return_if_fail (parse != NULL);
2913 parse->priv->fps_num = fps_num;
2914 parse->priv->fps_den = fps_den;
2915 if (!fps_num || !fps_den) {
2916 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
2918 fps_num = fps_den = 0;
2919 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
2920 parse->priv->lead_in = parse->priv->lead_out = 0;
2921 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
2923 parse->priv->frame_duration =
2924 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
2925 parse->priv->lead_in = lead_in;
2926 parse->priv->lead_out = lead_out;
2927 parse->priv->lead_in_ts =
2928 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
2929 parse->priv->lead_out_ts =
2930 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
2931 /* aim for about 1.5s to estimate duration */
2932 if (parse->priv->update_interval < 0) {
2933 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
2934 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
2935 parse->priv->update_interval);
2938 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
2939 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
2940 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
2941 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
2942 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
2943 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
2947 * gst_base_parse_set_has_timing_info:
2948 * @parse: a #GstBaseParse
2949 * @has_timing: whether frames carry timing information
2951 * Set if frames carry timing information which the subclass can (generally)
2952 * parse and provide. In particular, intrinsic (rather than estimated) time
2953 * can be obtained following a seek.
2958 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
2960 parse->priv->has_timing_info = has_timing;
2961 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
2965 * gst_base_parse_set_syncable:
2966 * @parse: a #GstBaseParse
2967 * @syncable: set if frame starts can be identified
2969 * Set if frame starts can be identified. This is set by default and
2970 * determines whether seeking based on bitrate averages
2971 * is possible for a format/stream.
2976 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
2978 parse->priv->syncable = syncable;
2979 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
2983 * gst_base_parse_set_passthrough:
2984 * @parse: a #GstBaseParse
2987 * Set if the nature of the format or configuration does not allow (much)
2988 * parsing, and the parser should operate in passthrough mode (which only
2989 * applies when operating in push mode). That is, incoming buffers are
2990 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
2991 * callbacks will be invoked, but @pre_push_buffer will still be invoked,
2992 * so subclass can perform as much or as little is appropriate for
2993 * passthrough semantics in @pre_push_buffer.
2998 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3000 parse->priv->passthrough = passthrough;
3001 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3005 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3006 GstClockTime * duration)
3008 gboolean res = FALSE;
3010 g_return_val_if_fail (duration != NULL, FALSE);
3012 *duration = GST_CLOCK_TIME_NONE;
3013 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3014 GST_LOG_OBJECT (parse, "using provided duration");
3015 *duration = parse->priv->duration;
3017 } else if (parse->priv->duration != -1) {
3018 GST_LOG_OBJECT (parse, "converting provided duration");
3019 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3020 parse->priv->duration, format, (gint64 *) duration);
3021 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3022 GST_LOG_OBJECT (parse, "using estimated duration");
3023 *duration = parse->priv->estimated_duration;
3027 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3028 GST_TIME_ARGS (*duration));
3032 static const GstQueryType *
3033 gst_base_parse_get_querytypes (GstPad * pad)
3035 static const GstQueryType list[] = {
3048 gst_base_parse_query (GstPad * pad, GstQuery * query)
3050 GstBaseParse *parse;
3051 gboolean res = FALSE;
3053 parse = GST_BASE_PARSE (GST_PAD_PARENT (pad));
3055 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3057 switch (GST_QUERY_TYPE (query)) {
3058 case GST_QUERY_POSITION:
3063 GST_DEBUG_OBJECT (parse, "position query");
3064 gst_query_parse_position (query, &format, NULL);
3066 GST_OBJECT_LOCK (parse);
3067 if (format == GST_FORMAT_BYTES) {
3068 dest_value = parse->priv->offset;
3070 } else if (format == parse->segment.format &&
3071 GST_CLOCK_TIME_IS_VALID (parse->segment.last_stop)) {
3072 dest_value = parse->segment.last_stop;
3075 GST_OBJECT_UNLOCK (parse);
3078 gst_query_set_position (query, format, dest_value);
3080 res = gst_pad_query_default (pad, query);
3082 /* no precise result, upstream no idea either, then best estimate */
3083 /* priv->offset is updated in both PUSH/PULL modes */
3084 res = gst_base_parse_convert (parse,
3085 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3090 case GST_QUERY_DURATION:
3093 GstClockTime duration;
3095 GST_DEBUG_OBJECT (parse, "duration query");
3096 gst_query_parse_duration (query, &format, NULL);
3098 /* consult upstream */
3099 res = gst_pad_query_default (pad, query);
3101 /* otherwise best estimate from us */
3103 res = gst_base_parse_get_duration (parse, format, &duration);
3105 gst_query_set_duration (query, format, duration);
3109 case GST_QUERY_SEEKING:
3112 GstClockTime duration = GST_CLOCK_TIME_NONE;
3113 gboolean seekable = FALSE;
3115 GST_DEBUG_OBJECT (parse, "seeking query");
3116 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3118 /* consult upstream */
3119 res = gst_pad_query_default (pad, query);
3121 /* we may be able to help if in TIME */
3122 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3123 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3124 /* already OK if upstream takes care */
3125 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3127 if (!(res && seekable)) {
3128 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3129 || duration == -1) {
3130 /* seekable if we still have a chance to get duration later on */
3132 parse->priv->upstream_seekable && parse->priv->update_interval;
3134 seekable = parse->priv->upstream_seekable;
3135 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3138 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3144 case GST_QUERY_FORMATS:
3145 gst_query_set_formatsv (query, 3, fmtlist);
3148 case GST_QUERY_CONVERT:
3150 GstFormat src_format, dest_format;
3151 gint64 src_value, dest_value;
3153 gst_query_parse_convert (query, &src_format, &src_value,
3154 &dest_format, &dest_value);
3156 res = gst_base_parse_convert (parse, src_format, src_value,
3157 dest_format, &dest_value);
3159 gst_query_set_convert (query, src_format, src_value,
3160 dest_format, dest_value);
3165 res = gst_pad_query_default (pad, query);
3171 /* scans for a cluster start from @pos,
3172 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3173 static GstFlowReturn
3174 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3175 GstClockTime * time, GstClockTime * duration)
3177 GstBaseParseClass *klass;
3179 gboolean orig_drain, orig_discont;
3180 GstFlowReturn ret = GST_FLOW_OK;
3181 GstBuffer *buf = NULL;
3182 GstBaseParseFrame frame;
3184 g_return_val_if_fail (GST_FLOW_ERROR, pos != NULL);
3185 g_return_val_if_fail (GST_FLOW_ERROR, time != NULL);
3186 g_return_val_if_fail (GST_FLOW_ERROR, duration != NULL);
3188 klass = GST_BASE_PARSE_GET_CLASS (parse);
3190 *time = GST_CLOCK_TIME_NONE;
3191 *duration = GST_CLOCK_TIME_NONE;
3194 orig_offset = parse->priv->offset;
3195 orig_discont = parse->priv->discont;
3196 orig_drain = parse->priv->drain;
3198 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3199 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3201 gst_base_parse_frame_init (&frame);
3203 /* jump elsewhere and locate next frame */
3204 parse->priv->offset = *pos;
3205 ret = gst_base_parse_scan_frame (parse, klass, &frame, FALSE);
3206 if (ret != GST_FLOW_OK)
3210 GST_LOG_OBJECT (parse,
3211 "peek parsing frame at offset %" G_GUINT64_FORMAT
3212 " (%#" G_GINT64_MODIFIER "x) of size %d",
3213 GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET (buf), GST_BUFFER_SIZE (buf));
3215 /* get offset first, subclass parsing might dump other stuff in there */
3216 *pos = GST_BUFFER_OFFSET (buf);
3217 ret = klass->parse_frame (parse, &frame);
3220 /* but it should provide proper time */
3221 *time = GST_BUFFER_TIMESTAMP (buf);
3222 *duration = GST_BUFFER_DURATION (buf);
3224 gst_base_parse_frame_free (&frame);
3226 GST_LOG_OBJECT (parse,
3227 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3228 GST_TIME_ARGS (*time), *pos);
3232 parse->priv->offset = orig_offset;
3233 parse->priv->discont = orig_discont;
3234 parse->priv->drain = orig_drain;
3239 /* bisect and scan through file for frame starting before @time,
3240 * returns OK and @time/@offset if found, NONE and/or error otherwise
3241 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3242 static GstFlowReturn
3243 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3246 GstFlowReturn ret = GST_FLOW_OK;
3247 gint64 lpos, hpos, newpos;
3248 GstClockTime time, ltime, htime, newtime, dur;
3249 gboolean cont = TRUE;
3250 const GstClockTime tolerance = TARGET_DIFFERENCE;
3251 const guint chunk = 4 * 1024;
3253 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3254 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3256 /* TODO also make keyframe aware if useful some day */
3271 /* do not know at first */
3273 *_time = GST_CLOCK_TIME_NONE;
3275 /* need initial positions; start and end */
3276 lpos = parse->priv->first_frame_offset;
3277 ltime = parse->priv->first_frame_ts;
3278 htime = parse->priv->duration;
3279 hpos = parse->priv->upstream_size;
3281 /* check preconditions are satisfied;
3282 * start and end are needed, except for special case where we scan for
3283 * last frame to determine duration */
3284 if (parse->priv->pad_mode != GST_ACTIVATE_PULL || !hpos ||
3285 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3286 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3290 /* shortcut cases */
3293 } else if (time < ltime + tolerance) {
3297 } else if (time >= htime) {
3303 while (htime > ltime && cont) {
3304 GST_LOG_OBJECT (parse,
3305 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3306 GST_TIME_ARGS (ltime));
3307 GST_LOG_OBJECT (parse,
3308 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3309 GST_TIME_ARGS (htime));
3310 if (G_UNLIKELY (time == G_MAXINT64)) {
3312 } else if (G_LIKELY (hpos > lpos)) {
3314 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3317 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3319 /* we check this case once, but not forever, so break loop */
3324 newpos = CLAMP (newpos, lpos, hpos);
3325 GST_LOG_OBJECT (parse,
3326 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3327 GST_TIME_ARGS (time), newpos);
3329 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3330 if (ret == GST_FLOW_UNEXPECTED) {
3331 /* heuristic HACK */
3332 hpos = MAX (lpos, hpos - chunk);
3334 } else if (ret != GST_FLOW_OK) {
3338 if (newtime == -1 || newpos == -1) {
3339 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3343 if (G_UNLIKELY (time == G_MAXINT64)) {
3346 if (GST_CLOCK_TIME_IS_VALID (dur))
3349 } else if (newtime > time) {
3351 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3353 } else if (newtime + tolerance > time) {
3354 /* close enough undershoot */
3358 } else if (newtime < ltime) {
3359 /* so a position beyond lpos resulted in earlier time than ltime ... */
3360 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3363 /* undershoot too far */
3364 newpos += newpos == lpos ? chunk : 0;
3365 lpos = CLAMP (newpos, lpos, hpos);
3371 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3372 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3377 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3378 gboolean before, GstClockTime * _ts)
3380 gint64 bytes = 0, ts = 0;
3381 GstIndexEntry *entry = NULL;
3383 if (time == GST_CLOCK_TIME_NONE) {
3389 GST_OBJECT_LOCK (parse);
3390 if (parse->priv->index) {
3391 /* Let's check if we have an index entry for that time */
3392 entry = gst_index_get_assoc_entry (parse->priv->index,
3393 parse->priv->index_id,
3394 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3395 GST_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3399 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3400 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3402 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3403 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3404 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3406 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3407 GST_TIME_ARGS (time));
3410 ts = GST_CLOCK_TIME_NONE;
3413 GST_OBJECT_UNLOCK (parse);
3422 /* returns TRUE if seek succeeded */
3424 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3429 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3430 gboolean flush, update, res = TRUE, accurate;
3431 gint64 cur, stop, seekpos, seekstop;
3432 GstSegment seeksegment = { 0, };
3433 GstFormat dstformat;
3434 GstClockTime start_ts;
3436 gst_event_parse_seek (event, &rate, &format, &flags,
3437 &cur_type, &cur, &stop_type, &stop);
3439 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3440 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3441 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3442 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3444 /* no negative rates in push mode */
3445 if (rate < 0.0 && parse->priv->pad_mode == GST_ACTIVATE_PUSH)
3448 if (cur_type != GST_SEEK_TYPE_SET ||
3449 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3452 /* For any format other than TIME, see if upstream handles
3453 * it directly or fail. For TIME, try upstream, but do it ourselves if
3454 * it fails upstream */
3455 if (format != GST_FORMAT_TIME) {
3456 /* default action delegates to upstream */
3460 gst_event_ref (event);
3461 if ((res = gst_pad_push_event (parse->sinkpad, event))) {
3466 /* get flush flag */
3467 flush = flags & GST_SEEK_FLAG_FLUSH;
3469 /* copy segment, we need this because we still need the old
3470 * segment when we close the current segment. */
3471 memcpy (&seeksegment, &parse->segment, sizeof (GstSegment));
3473 GST_DEBUG_OBJECT (parse, "configuring seek");
3474 gst_segment_set_seek (&seeksegment, rate, format, flags,
3475 cur_type, cur, stop_type, stop, &update);
3477 /* accurate seeking implies seek tables are used to obtain position,
3478 * and the requested segment is maintained exactly, not adjusted any way */
3479 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3481 /* maybe we can be accurate for (almost) free */
3482 gst_base_parse_find_offset (parse, seeksegment.last_stop, TRUE, &start_ts);
3483 if (seeksegment.last_stop <= start_ts + TARGET_DIFFERENCE) {
3484 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3488 GstClockTime startpos = seeksegment.last_stop;
3490 /* accurate requested, so ... seek a bit before target */
3491 if (startpos < parse->priv->lead_in_ts)
3494 startpos -= parse->priv->lead_in_ts;
3495 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3496 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3499 start_ts = seeksegment.last_stop;
3500 dstformat = GST_FORMAT_BYTES;
3501 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.last_stop,
3502 &dstformat, &seekpos))
3503 goto convert_failed;
3504 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3505 &dstformat, &seekstop))
3506 goto convert_failed;
3509 GST_DEBUG_OBJECT (parse,
3510 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3512 GST_DEBUG_OBJECT (parse,
3513 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3514 seeksegment.stop, seekstop);
3516 if (parse->priv->pad_mode == GST_ACTIVATE_PULL) {
3519 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3522 if (parse->srcpad) {
3523 GST_DEBUG_OBJECT (parse, "sending flush start");
3524 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3525 /* unlock upstream pull_range */
3526 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3529 gst_pad_pause_task (parse->sinkpad);
3532 /* we should now be able to grab the streaming thread because we stopped it
3533 * with the above flush/pause code */
3534 GST_PAD_STREAM_LOCK (parse->sinkpad);
3536 /* save current position */
3537 last_stop = parse->segment.last_stop;
3538 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3541 /* now commit to new position */
3543 /* prepare for streaming again */
3545 GST_DEBUG_OBJECT (parse, "sending flush stop");
3546 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop ());
3547 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop ());
3548 gst_base_parse_clear_queues (parse);
3550 if (parse->priv->close_segment)
3551 gst_event_unref (parse->priv->close_segment);
3553 parse->priv->close_segment = gst_event_new_new_segment (TRUE,
3554 parse->segment.rate, parse->segment.format,
3555 parse->segment.accum, parse->segment.last_stop, parse->segment.accum);
3557 /* keep track of our last_stop */
3558 seeksegment.accum = parse->segment.last_stop;
3560 GST_DEBUG_OBJECT (parse, "Created close seg format %d, "
3561 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3562 ", pos = %" GST_TIME_FORMAT, format,
3563 GST_TIME_ARGS (parse->segment.accum),
3564 GST_TIME_ARGS (parse->segment.last_stop),
3565 GST_TIME_ARGS (parse->segment.accum));
3568 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3570 /* store the newsegment event so it can be sent from the streaming thread. */
3571 if (parse->priv->pending_segment)
3572 gst_event_unref (parse->priv->pending_segment);
3574 /* This will be sent later in _loop() */
3575 parse->priv->pending_segment =
3576 gst_event_new_new_segment (FALSE, parse->segment.rate,
3577 parse->segment.format, parse->segment.start,
3578 parse->segment.stop, parse->segment.start);
3580 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3581 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3582 ", pos = %" GST_TIME_FORMAT, format,
3583 GST_TIME_ARGS (parse->segment.start),
3584 GST_TIME_ARGS (parse->segment.stop),
3585 GST_TIME_ARGS (parse->segment.start));
3587 /* one last chance in pull mode to stay accurate;
3588 * maybe scan and subclass can find where to go */
3591 GstClockTime ts = seeksegment.last_stop;
3593 gst_base_parse_locate_time (parse, &ts, &scanpos);
3597 /* running collected index now consists of several intervals,
3598 * so optimized check no longer possible */
3599 parse->priv->index_last_valid = FALSE;
3600 parse->priv->index_last_offset = 0;
3601 parse->priv->index_last_ts = 0;
3605 /* mark discont if we are going to stream from another position. */
3606 if (seekpos != parse->priv->offset) {
3607 GST_DEBUG_OBJECT (parse,
3608 "mark DISCONT, we did a seek to another position");
3609 parse->priv->offset = seekpos;
3610 parse->priv->last_offset = seekpos;
3611 parse->priv->seen_keyframe = FALSE;
3612 parse->priv->discont = TRUE;
3613 parse->priv->next_ts = start_ts;
3614 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3615 parse->priv->sync_offset = seekpos;
3616 parse->priv->exact_position = accurate;
3619 /* Start streaming thread if paused */
3620 gst_pad_start_task (parse->sinkpad,
3621 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3623 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3628 GstEvent *new_event;
3629 GstBaseParseSeek *seek;
3631 /* The only thing we need to do in PUSH-mode is to send the
3632 seek event (in bytes) to upstream. Segment / flush handling happens
3633 in corresponding src event handlers */
3634 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3635 if (seekstop >= 0 && seekpos <= seekpos)
3637 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flush,
3638 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3640 /* store segment info so its precise details can be reconstructed when
3641 * receiving newsegment;
3642 * this matters for all details when accurate seeking,
3643 * is most useful to preserve NONE stop time otherwise */
3644 seek = g_new0 (GstBaseParseSeek, 1);
3645 seek->segment = seeksegment;
3646 seek->accurate = accurate;
3647 seek->offset = seekpos;
3648 seek->start_ts = start_ts;
3649 GST_OBJECT_LOCK (parse);
3650 /* less optimal, but preserves order */
3651 parse->priv->pending_seeks =
3652 g_slist_append (parse->priv->pending_seeks, seek);
3653 GST_OBJECT_UNLOCK (parse);
3655 res = gst_pad_push_event (parse->sinkpad, new_event);
3658 GST_OBJECT_LOCK (parse);
3659 parse->priv->pending_seeks =
3660 g_slist_remove (parse->priv->pending_seeks, seek);
3661 GST_OBJECT_UNLOCK (parse);
3667 /* handled event is ours to free */
3669 gst_event_unref (event);
3675 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
3681 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
3687 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
3693 /* Checks if bitrates are available from upstream tags so that we don't
3694 * override them later
3697 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
3699 GstTagList *taglist = NULL;
3702 gst_event_parse_tag (event, &taglist);
3704 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
3705 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
3706 parse->priv->post_min_bitrate = FALSE;
3708 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
3709 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
3710 parse->priv->post_avg_bitrate = FALSE;
3712 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
3713 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
3714 parse->priv->post_max_bitrate = FALSE;
3719 gst_base_parse_sink_setcaps (GstPad * pad, GstCaps * caps)
3721 GstBaseParse *parse;
3722 GstBaseParseClass *klass;
3723 gboolean res = TRUE;
3725 parse = GST_BASE_PARSE (GST_PAD_PARENT (pad));
3726 klass = GST_BASE_PARSE_GET_CLASS (parse);
3728 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
3730 if (klass->set_sink_caps)
3731 res = klass->set_sink_caps (parse, caps);
3737 gst_base_parse_set_index (GstElement * element, GstIndex * index)
3739 GstBaseParse *parse = GST_BASE_PARSE (element);
3741 GST_OBJECT_LOCK (parse);
3742 if (parse->priv->index)
3743 gst_object_unref (parse->priv->index);
3745 parse->priv->index = gst_object_ref (index);
3746 gst_index_get_writer_id (index, GST_OBJECT (element),
3747 &parse->priv->index_id);
3748 parse->priv->own_index = FALSE;
3750 parse->priv->index = NULL;
3751 GST_OBJECT_UNLOCK (parse);
3755 gst_base_parse_get_index (GstElement * element)
3757 GstBaseParse *parse = GST_BASE_PARSE (element);
3758 GstIndex *result = NULL;
3760 GST_OBJECT_LOCK (parse);
3761 if (parse->priv->index)
3762 result = gst_object_ref (parse->priv->index);
3763 GST_OBJECT_UNLOCK (parse);
3768 static GstStateChangeReturn
3769 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
3771 GstBaseParse *parse;
3772 GstStateChangeReturn result;
3774 parse = GST_BASE_PARSE (element);
3776 switch (transition) {
3777 case GST_STATE_CHANGE_READY_TO_PAUSED:
3778 /* If this is our own index destroy it as the
3779 * old entries might be wrong for the new stream */
3780 if (parse->priv->own_index) {
3781 gst_object_unref (parse->priv->index);
3782 parse->priv->index = NULL;
3783 parse->priv->own_index = FALSE;
3786 /* If no index was created, generate one */
3787 if (G_UNLIKELY (!parse->priv->index)) {
3788 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
3790 parse->priv->index = gst_index_factory_make ("memindex");
3791 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
3792 &parse->priv->index_id);
3793 parse->priv->own_index = TRUE;
3800 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
3802 switch (transition) {
3803 case GST_STATE_CHANGE_PAUSED_TO_READY:
3804 gst_base_parse_reset (parse);