2 * Copyright (C) 2008 Nokia Corporation. All rights reserved.
3 * Contact: Stefan Kost <stefan.kost@nokia.com>
4 * Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
5 * Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
6 * Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
25 * SECTION:gstbaseparse
26 * @short_description: Base class for stream parsers
27 * @see_also: #GstBaseTransform
29 * This base class is for parser elements that process data and splits it
30 * into separate audio/video/whatever frames.
34 * <listitem><para>provides one sink pad and one source pad</para></listitem>
35 * <listitem><para>handles state changes</para></listitem>
36 * <listitem><para>can operate in pull mode or push mode</para></listitem>
37 * <listitem><para>handles seeking in both modes</para></listitem>
38 * <listitem><para>handles events (NEWSEGMENT/EOS/FLUSH)</para></listitem>
40 * handles queries (POSITION/DURATION/SEEKING/FORMAT/CONVERT)
42 * <listitem><para>handles flushing</para></listitem>
45 * The purpose of this base class is to provide the basic functionality of
46 * a parser and share a lot of rather complex code.
48 * Description of the parsing mechanism:
51 * <itemizedlist><title>Set-up phase</title>
53 * GstBaseParse class calls @set_sink_caps to inform the subclass about
54 * incoming sinkpad caps. Subclass should set the srcpad caps accordingly.
57 * GstBaseParse calls @start to inform subclass that data processing is
61 * At least at this point subclass needs to tell the GstBaseParse class
62 * how big data chunks it wants to receive (min_frame_size). It can do
63 * this with gst_base_parse_set_min_frame_size().
66 * GstBaseParse class sets up appropriate data passing mode (pull/push)
67 * and starts to process the data.
73 * <title>Parsing phase</title>
75 * GstBaseParse gathers at least min_frame_size bytes of data either
76 * by pulling it from upstream or collecting buffers in an internal
80 * A buffer of (at least) min_frame_size bytes is passed to subclass with
81 * @check_valid_frame. Subclass checks the contents and returns TRUE
82 * if the buffer contains a valid frame. It also needs to set the
83 * @framesize according to the detected frame size. If buffer didn't
84 * contain a valid frame, this call must return FALSE and optionally
85 * set the @skipsize value to inform base class that how many bytes
86 * it needs to skip in order to find a valid frame. @framesize can always
87 * indicate a new minimum for current frame parsing. Indicating G_MAXUINT
88 * for requested amount means subclass simply needs best available
89 * subsequent data. In push mode this amounts to an additional input buffer
90 * (thus minimal additional latency), in pull mode this amounts to some
91 * arbitrary reasonable buffer size increase. The passed buffer
92 * is read-only. Note that @check_valid_frame might receive any small
93 * amount of input data when leftover data is being drained (e.g. at EOS).
96 * After valid frame is found, it will be passed again to subclass with
97 * @parse_frame call. Now subclass is responsible for parsing the
98 * frame contents and setting the caps, and buffer metadata (e.g.
99 * buffer timestamp and duration, or keyframe if applicable).
100 * (although the latter can also be done by GstBaseParse if it is
101 * appropriately configured, see below). Frame is provided with
102 * timestamp derived from upstream (as much as generally possible),
103 * duration obtained from configuration (see below), and offset
104 * if meaningful (in pull mode).
107 * Finally the buffer can be pushed downstream and the parsing loop starts
108 * over again. Just prior to actually pushing the buffer in question,
109 * it is passed to @pre_push_frame which gives subclass yet one
110 * last chance to examine buffer metadata, or to send some custom (tag)
111 * events, or to perform custom (segment) filtering.
114 * During the parsing process GstBaseParseClass will handle both srcpad
115 * and sinkpad events. They will be passed to subclass if @event or
116 * @src_event callbacks have been provided.
121 * <itemizedlist><title>Shutdown phase</title>
123 * GstBaseParse class calls @stop to inform the subclass that data
124 * parsing will be stopped.
130 * Subclass is responsible for providing pad template caps for
131 * source and sink pads. The pads need to be named "sink" and "src". It also
132 * needs to set the fixed caps on srcpad, when the format is ensured (e.g.
133 * when base class calls subclass' @set_sink_caps function).
135 * This base class uses #GST_FORMAT_DEFAULT as a meaning of frames. So,
136 * subclass conversion routine needs to know that conversion from
137 * #GST_FORMAT_TIME to #GST_FORMAT_DEFAULT must return the
138 * frame number that can be found from the given byte position.
140 * GstBaseParse uses subclasses conversion methods also for seeking (or
141 * otherwise uses its own default one, see also below).
143 * Subclass @start and @stop functions will be called to inform the beginning
144 * and end of data processing.
146 * Things that subclass need to take care of:
148 * <listitem><para>Provide pad templates</para></listitem>
150 * Fixate the source pad caps when appropriate
153 * Inform base class how big data chunks should be retrieved. This is
154 * done with gst_base_parse_set_min_frame_size() function.
157 * Examine data chunks passed to subclass with @check_valid_frame
158 * and tell if they contain a valid frame
161 * Set the caps and timestamp to frame that is passed to subclass with
162 * @parse_frame function.
164 * <listitem><para>Provide conversion functions</para></listitem>
166 * Update the duration information with gst_base_parse_set_duration()
169 * Optionally passthrough using gst_base_parse_set_passthrough()
172 * Configure various baseparse parameters using
173 * gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
174 * and gst_base_parse_set_frame_rate().
177 * In particular, if subclass is unable to determine a duration, but
178 * parsing (or specs) yields a frames per seconds rate, then this can be
179 * provided to GstBaseParse to enable it to cater for
180 * buffer time metadata (which will be taken from upstream as much as
181 * possible). Internally keeping track of frame durations and respective
182 * sizes that have been pushed provides GstBaseParse with an estimated
183 * bitrate. A default @convert (used if not overriden) will then use these
184 * rates to perform obvious conversions. These rates are also used to
185 * update (estimated) duration at regular frame intervals.
192 * - In push mode provide a queue of adapter-"queued" buffers for upstream
194 * - Queue buffers/events until caps are set
204 #include <gst/base/gstadapter.h>
206 #include "gstbaseparse.h"
208 #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
210 #define MIN_FRAMES_TO_POST_BITRATE 10
211 #define TARGET_DIFFERENCE (20 * GST_SECOND)
213 GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
214 #define GST_CAT_DEFAULT gst_base_parse_debug
216 /* Supported formats */
217 static const GstFormat fmtlist[] = {
224 #define GST_BASE_PARSE_GET_PRIVATE(obj) \
225 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
227 struct _GstBaseParsePrivate
234 GstFormat duration_fmt;
235 gint64 estimated_duration;
236 gint64 estimated_drift;
238 guint min_frame_size;
239 gboolean passthrough;
241 gboolean has_timing_info;
242 guint fps_num, fps_den;
243 gint update_interval;
245 guint lead_in, lead_out;
246 GstClockTime lead_in_ts, lead_out_ts;
247 GstClockTime min_latency, max_latency;
255 GstClockTime next_ts;
256 GstClockTime prev_ts;
257 GstClockTime frame_duration;
258 gboolean seen_keyframe;
263 guint64 data_bytecount;
264 guint64 acc_duration;
265 GstClockTime first_frame_ts;
266 gint64 first_frame_offset;
268 gboolean post_min_bitrate;
269 gboolean post_avg_bitrate;
270 gboolean post_max_bitrate;
274 guint posted_avg_bitrate;
276 GList *pending_events;
278 /* frames/buffers that are queued and ready to go on OK */
279 GQueue queued_frames;
283 /* index entry storage, either ours or provided */
287 GStaticMutex index_lock;
289 /* seek table entries only maintained if upstream is BYTE seekable */
290 gboolean upstream_seekable;
291 gboolean upstream_has_duration;
292 gint64 upstream_size;
293 /* minimum distance between two index entries */
294 GstClockTimeDiff idx_interval;
295 /* ts and offset of last entry added */
296 GstClockTime index_last_ts;
297 gint64 index_last_offset;
298 gboolean index_last_valid;
300 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
301 gboolean exact_position;
302 /* seek events are temporarily kept to match them with newsegments */
303 GSList *pending_seeks;
305 /* reverse playback */
306 GSList *buffers_pending;
307 GSList *buffers_queued;
308 GSList *buffers_send;
309 GstClockTime last_ts;
312 /* Newsegment event to be sent after SEEK */
313 GstEvent *pending_segment;
315 /* Segment event that closes the running segment prior to SEEK */
316 GstEvent *close_segment;
318 /* push mode helper frame */
319 GstBaseParseFrame frame;
321 /* TRUE if we're still detecting the format, i.e.
322 * if ::detect() is still called for future buffers */
324 GList *detect_buffers;
325 guint detect_buffers_size;
328 typedef struct _GstBaseParseSeek
333 GstClockTime start_ts;
336 static GstElementClass *parent_class = NULL;
338 static void gst_base_parse_class_init (GstBaseParseClass * klass);
339 static void gst_base_parse_init (GstBaseParse * parse,
340 GstBaseParseClass * klass);
343 gst_base_parse_get_type (void)
345 static volatile gsize base_parse_type = 0;
347 if (g_once_init_enter (&base_parse_type)) {
348 static const GTypeInfo base_parse_info = {
349 sizeof (GstBaseParseClass),
350 (GBaseInitFunc) NULL,
351 (GBaseFinalizeFunc) NULL,
352 (GClassInitFunc) gst_base_parse_class_init,
355 sizeof (GstBaseParse),
357 (GInstanceInitFunc) gst_base_parse_init,
361 _type = g_type_register_static (GST_TYPE_ELEMENT,
362 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
363 g_once_init_leave (&base_parse_type, _type);
365 return (GType) base_parse_type;
368 static void gst_base_parse_finalize (GObject * object);
370 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
371 GstStateChange transition);
372 static void gst_base_parse_reset (GstBaseParse * parse);
374 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
375 static GstIndex *gst_base_parse_get_index (GstElement * element);
377 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
379 static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
380 GstObject * parent, GstPadMode mode, gboolean active);
381 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
383 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
385 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
387 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
390 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
392 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
395 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
397 static void gst_base_parse_loop (GstPad * pad);
399 static gboolean gst_base_parse_check_frame (GstBaseParse * parse,
400 GstBaseParseFrame * frame, guint * framesize, gint * skipsize);
401 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
402 GstBaseParseFrame * frame);
404 static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse,
407 static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse,
410 static void gst_base_parse_drain (GstBaseParse * parse);
412 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
413 gboolean post_min, gboolean post_avg, gboolean post_max);
415 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
416 GstClockTime time, gboolean before, GstClockTime * _ts);
417 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
418 GstClockTime * _time, gint64 * _offset);
420 static GstFlowReturn gst_base_parse_process_fragment (GstBaseParse * parse,
423 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
426 gst_base_parse_clear_queues (GstBaseParse * parse)
428 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
429 g_slist_free (parse->priv->buffers_queued);
430 parse->priv->buffers_queued = NULL;
431 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
433 g_slist_free (parse->priv->buffers_pending);
434 parse->priv->buffers_pending = NULL;
435 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
436 g_slist_free (parse->priv->buffers_send);
437 parse->priv->buffers_send = NULL;
439 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
440 g_list_free (parse->priv->detect_buffers);
441 parse->priv->detect_buffers = NULL;
442 parse->priv->detect_buffers_size = 0;
446 gst_base_parse_finalize (GObject * object)
448 GstBaseParse *parse = GST_BASE_PARSE (object);
451 g_object_unref (parse->priv->adapter);
453 if (parse->priv->pending_segment) {
454 p_ev = &parse->priv->pending_segment;
455 gst_event_replace (p_ev, NULL);
457 if (parse->priv->close_segment) {
458 p_ev = &parse->priv->close_segment;
459 gst_event_replace (p_ev, NULL);
462 if (parse->priv->cache) {
463 gst_buffer_unref (parse->priv->cache);
464 parse->priv->cache = NULL;
467 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
469 g_list_free (parse->priv->pending_events);
470 parse->priv->pending_events = NULL;
472 g_queue_foreach (&parse->priv->queued_frames,
473 (GFunc) gst_base_parse_frame_free, NULL);
474 g_queue_clear (&parse->priv->queued_frames);
476 if (parse->priv->index) {
477 gst_object_unref (parse->priv->index);
478 parse->priv->index = NULL;
481 g_static_mutex_free (&parse->priv->index_lock);
483 gst_base_parse_clear_queues (parse);
485 G_OBJECT_CLASS (parent_class)->finalize (object);
489 gst_base_parse_class_init (GstBaseParseClass * klass)
491 GObjectClass *gobject_class;
492 GstElementClass *gstelement_class;
494 gobject_class = G_OBJECT_CLASS (klass);
495 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
496 parent_class = g_type_class_peek_parent (klass);
497 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
499 gstelement_class = (GstElementClass *) klass;
500 gstelement_class->change_state =
501 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
502 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
503 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
505 /* Default handlers */
506 klass->check_valid_frame = gst_base_parse_check_frame;
507 klass->parse_frame = gst_base_parse_parse_frame;
508 klass->src_event = gst_base_parse_src_eventfunc;
509 klass->convert = gst_base_parse_convert_default;
511 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
512 "baseparse element");
516 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
518 GstPadTemplate *pad_template;
520 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
522 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
525 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
526 g_return_if_fail (pad_template != NULL);
527 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
528 gst_pad_set_event_function (parse->sinkpad,
529 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
530 gst_pad_set_query_function (parse->sinkpad,
531 GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
532 gst_pad_set_chain_function (parse->sinkpad,
533 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
534 gst_pad_set_activate_function (parse->sinkpad,
535 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
536 gst_pad_set_activatemode_function (parse->sinkpad,
537 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
538 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
540 GST_DEBUG_OBJECT (parse, "sinkpad created");
543 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
544 g_return_if_fail (pad_template != NULL);
545 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
546 gst_pad_set_event_function (parse->srcpad,
547 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
548 gst_pad_set_query_function (parse->srcpad,
549 GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
550 gst_pad_use_fixed_caps (parse->srcpad);
551 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
552 GST_DEBUG_OBJECT (parse, "src created");
554 g_queue_init (&parse->priv->queued_frames);
556 parse->priv->adapter = gst_adapter_new ();
558 parse->priv->pad_mode = GST_PAD_MODE_NONE;
560 g_static_mutex_init (&parse->priv->index_lock);
563 gst_base_parse_reset (parse);
564 GST_DEBUG_OBJECT (parse, "init ok");
566 GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE);
569 static GstBaseParseFrame *
570 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
572 GstBaseParseFrame *copy;
574 copy = g_slice_dup (GstBaseParseFrame, frame);
575 copy->buffer = gst_buffer_ref (frame->buffer);
576 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
578 GST_TRACE ("copied frame %p -> %p", frame, copy);
584 gst_base_parse_frame_free (GstBaseParseFrame * frame)
586 GST_TRACE ("freeing frame %p", frame);
589 gst_buffer_unref (frame->buffer);
590 frame->buffer = NULL;
593 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
594 g_slice_free (GstBaseParseFrame, frame);
596 memset (frame, 0, sizeof (*frame));
601 gst_base_parse_frame_get_type (void)
603 static volatile gsize frame_type = 0;
605 if (g_once_init_enter (&frame_type)) {
608 _type = g_boxed_type_register_static ("GstBaseParseFrame",
609 (GBoxedCopyFunc) gst_base_parse_frame_copy,
610 (GBoxedFreeFunc) gst_base_parse_frame_free);
611 g_once_init_leave (&frame_type, _type);
613 return (GType) frame_type;
617 * gst_base_parse_frame_init:
618 * @frame: #GstBaseParseFrame.
620 * Sets a #GstBaseParseFrame to initial state. Currently this means
621 * all public fields are zero-ed and a private flag is set to make
622 * sure gst_base_parse_frame_free() only frees the contents but not
623 * the actual frame. Use this function to initialise a #GstBaseParseFrame
624 * allocated on the stack.
629 gst_base_parse_frame_init (GstBaseParseFrame * frame)
631 memset (frame, 0, sizeof (GstBaseParseFrame));
632 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
633 GST_TRACE ("inited frame %p", frame);
637 * gst_base_parse_frame_new:
638 * @buffer: (transfer none): a #GstBuffer
640 * @overhead: number of bytes in this frame which should be counted as
641 * metadata overhead, ie. not used to calculate the average bitrate.
642 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
644 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
645 * elements written in C should usually allocate the frame on the stack and
646 * then use gst_base_parse_frame_init() to initialise it.
648 * Returns: a newly-allocated #GstBaseParseFrame. Free with
649 * gst_base_parse_frame_free() when no longer needed, unless you gave
650 * away ownership to gst_base_parse_push_frame().
655 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
658 GstBaseParseFrame *frame;
660 frame = g_slice_new0 (GstBaseParseFrame);
661 frame->buffer = gst_buffer_ref (buffer);
663 GST_TRACE ("created frame %p", frame);
668 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
671 gst_buffer_replace (&frame->buffer, buf);
675 /* set flags one by one for clarity */
676 if (G_UNLIKELY (parse->priv->drain))
677 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
679 /* losing sync is pretty much a discont (and vice versa), no ? */
680 if (G_UNLIKELY (parse->priv->discont))
681 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
685 gst_base_parse_reset (GstBaseParse * parse)
687 GST_OBJECT_LOCK (parse);
688 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
689 parse->priv->duration = -1;
690 parse->priv->min_frame_size = 1;
691 parse->priv->discont = TRUE;
692 parse->priv->flushing = FALSE;
693 parse->priv->offset = 0;
694 parse->priv->sync_offset = 0;
695 parse->priv->update_interval = -1;
696 parse->priv->fps_num = parse->priv->fps_den = 0;
697 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
698 parse->priv->lead_in = parse->priv->lead_out = 0;
699 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
700 parse->priv->bitrate = 0;
701 parse->priv->framecount = 0;
702 parse->priv->bytecount = 0;
703 parse->priv->acc_duration = 0;
704 parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE;
705 parse->priv->first_frame_offset = -1;
706 parse->priv->estimated_duration = -1;
707 parse->priv->estimated_drift = 0;
708 parse->priv->next_ts = 0;
709 parse->priv->syncable = TRUE;
710 parse->priv->passthrough = FALSE;
711 parse->priv->has_timing_info = FALSE;
712 parse->priv->post_min_bitrate = TRUE;
713 parse->priv->post_avg_bitrate = TRUE;
714 parse->priv->post_max_bitrate = TRUE;
715 parse->priv->min_bitrate = G_MAXUINT;
716 parse->priv->max_bitrate = 0;
717 parse->priv->avg_bitrate = 0;
718 parse->priv->posted_avg_bitrate = 0;
720 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
721 parse->priv->index_last_offset = -1;
722 parse->priv->index_last_valid = TRUE;
723 parse->priv->upstream_seekable = FALSE;
724 parse->priv->upstream_size = 0;
725 parse->priv->upstream_has_duration = FALSE;
726 parse->priv->idx_interval = 0;
727 parse->priv->exact_position = TRUE;
728 parse->priv->seen_keyframe = FALSE;
730 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
731 parse->priv->last_offset = 0;
733 if (parse->priv->pending_segment) {
734 gst_event_unref (parse->priv->pending_segment);
735 parse->priv->pending_segment = NULL;
738 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
740 g_list_free (parse->priv->pending_events);
741 parse->priv->pending_events = NULL;
743 if (parse->priv->cache) {
744 gst_buffer_unref (parse->priv->cache);
745 parse->priv->cache = NULL;
748 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
749 g_slist_free (parse->priv->pending_seeks);
750 parse->priv->pending_seeks = NULL;
752 /* we know it is not alloc'ed, but maybe other stuff to free, some day ... */
753 parse->priv->frame._private_flags |=
754 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
755 gst_base_parse_frame_free (&parse->priv->frame);
757 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
758 g_list_free (parse->priv->detect_buffers);
759 parse->priv->detect_buffers = NULL;
760 parse->priv->detect_buffers_size = 0;
761 GST_OBJECT_UNLOCK (parse);
764 /* gst_base_parse_check_frame:
765 * @parse: #GstBaseParse.
766 * @buffer: GstBuffer.
767 * @framesize: This will be set to tell the found frame size in bytes.
768 * @skipsize: Output parameter that tells how much data needs to be skipped
769 * in order to find the following frame header.
771 * Default callback for check_valid_frame.
773 * Returns: Always TRUE.
776 gst_base_parse_check_frame (GstBaseParse * parse,
777 GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
779 *framesize = gst_buffer_get_size (frame->buffer);
785 /* gst_base_parse_parse_frame:
786 * @parse: #GstBaseParse.
787 * @buffer: #GstBuffer.
789 * Default callback for parse_frame.
792 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
794 GstBuffer *buffer = frame->buffer;
796 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
797 GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) {
798 GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts;
800 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
801 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
802 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
807 /* gst_base_parse_convert:
808 * @parse: #GstBaseParse.
809 * @src_format: #GstFormat describing the source format.
810 * @src_value: Source value to be converted.
811 * @dest_format: #GstFormat defining the converted format.
812 * @dest_value: Pointer where the conversion result will be put.
814 * Converts using configured "convert" vmethod in #GstBaseParse class.
816 * Returns: TRUE if conversion was successful.
819 gst_base_parse_convert (GstBaseParse * parse,
820 GstFormat src_format,
821 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
823 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
826 g_return_val_if_fail (dest_value != NULL, FALSE);
831 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
833 #ifndef GST_DISABLE_GST_DEBUG
836 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
837 GST_LOG_OBJECT (parse,
838 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
839 GST_TIME_ARGS (src_value), *dest_value);
840 } else if (dest_format == GST_FORMAT_TIME &&
841 src_format == GST_FORMAT_BYTES) {
842 GST_LOG_OBJECT (parse,
843 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
844 src_value, GST_TIME_ARGS (*dest_value));
846 GST_LOG_OBJECT (parse,
847 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
848 GST_STR_NULL (gst_format_get_name (src_format)),
849 GST_STR_NULL (gst_format_get_name (dest_format)),
850 src_value, *dest_value);
853 GST_DEBUG_OBJECT (parse, "conversion failed");
861 /* gst_base_parse_sink_event:
862 * @pad: #GstPad that received the event.
863 * @event: #GstEvent to be handled.
865 * Handler for sink pad events.
867 * Returns: TRUE if the event was handled.
870 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
873 GstBaseParseClass *bclass;
874 gboolean handled = FALSE;
877 parse = GST_BASE_PARSE (parent);
878 bclass = GST_BASE_PARSE_GET_CLASS (parse);
880 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
881 GST_EVENT_TYPE_NAME (event));
883 /* Cache all events except EOS, SEGMENT and FLUSH_STOP if we have a
885 if (parse->priv->pending_segment && GST_EVENT_TYPE (event) != GST_EVENT_EOS
886 && GST_EVENT_TYPE (event) != GST_EVENT_SEGMENT
887 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
888 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP
889 && GST_EVENT_TYPE (event) != GST_EVENT_CAPS) {
891 if (GST_EVENT_TYPE (event) == GST_EVENT_TAG)
892 /* See if any bitrate tags were posted */
893 gst_base_parse_handle_tag (parse, event);
895 parse->priv->pending_events =
896 g_list_append (parse->priv->pending_events, event);
900 if (GST_EVENT_TYPE (event) == GST_EVENT_EOS &&
901 parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
902 /* We've not posted bitrate tags yet - do so now */
903 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
906 handled = bclass->event (parse, event);
909 handled = gst_base_parse_sink_eventfunc (parse, event);
912 ret = gst_pad_event_default (pad, parent, event);
915 GST_DEBUG_OBJECT (parse, "event handled");
921 /* gst_base_parse_sink_eventfunc:
922 * @parse: #GstBaseParse.
923 * @event: #GstEvent to be handled.
925 * Element-level event handler function.
927 * The event will be unreffed only if it has been handled and this
928 * function returns %TRUE
930 * Returns: %TRUE if the event was handled and not need forwarding.
933 gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event)
935 gboolean handled = FALSE;
938 switch (GST_EVENT_TYPE (event)) {
942 GstBaseParseClass *klass;
944 klass = GST_BASE_PARSE_GET_CLASS (parse);
946 gst_event_parse_caps (event, &caps);
947 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
949 if (klass->set_sink_caps)
950 klass->set_sink_caps (parse, caps);
952 /* will send our own caps downstream */
953 gst_event_unref (event);
957 case GST_EVENT_SEGMENT:
959 const GstSegment *in_segment;
960 GstSegment out_segment;
961 gint64 offset = 0, next_ts;
964 gdouble rate, applied_rate;
966 gint64 start, stop, pos, next_ts;
970 gst_event_parse_segment (event, &in_segment);
971 gst_segment_init (&out_segment, GST_FORMAT_TIME);
973 GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
975 if (in_segment->format == GST_FORMAT_BYTES) {
976 GstBaseParseSeek *seek = NULL;
979 /* stop time is allowed to be open-ended, but not start & pos */
980 offset = in_segment->time;
982 GST_OBJECT_LOCK (parse);
983 for (node = parse->priv->pending_seeks; node; node = node->next) {
984 GstBaseParseSeek *tmp = node->data;
986 if (tmp->offset == offset) {
991 parse->priv->pending_seeks =
992 g_slist_remove (parse->priv->pending_seeks, seek);
993 GST_OBJECT_UNLOCK (parse);
996 GST_DEBUG_OBJECT (parse,
997 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
998 seek->accurate ? " accurate" : "", &seek->segment);
1000 out_segment.start = seek->segment.start;
1001 out_segment.stop = seek->segment.stop;
1002 out_segment.time = seek->segment.start;
1004 next_ts = seek->start_ts;
1005 parse->priv->exact_position = seek->accurate;
1008 /* best attempt convert */
1009 /* as these are only estimates, stop is kept open-ended to avoid
1010 * premature cutting */
1011 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
1012 GST_FORMAT_TIME, (gint64 *) & next_ts);
1014 out_segment.start = next_ts;
1015 out_segment.stop = GST_CLOCK_TIME_NONE;
1016 out_segment.time = next_ts;
1018 parse->priv->exact_position = (in_segment->start == 0);
1021 gst_event_unref (event);
1023 event = gst_event_new_segment (&out_segment);
1025 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1026 GST_SEGMENT_FORMAT, in_segment);
1028 } else if (in_segment->format != GST_FORMAT_TIME) {
1029 /* Unknown incoming segment format. Output a default open-ended
1031 gst_event_unref (event);
1033 out_segment.start = 0;
1034 out_segment.stop = GST_CLOCK_TIME_NONE;;
1035 out_segment.time = 0;;
1037 event = gst_event_new_segment (&out_segment);
1041 /* not considered BYTE seekable if it is talking to us in TIME,
1042 * whatever else it might claim */
1043 parse->priv->upstream_seekable = FALSE;
1044 next_ts = in_segment->start;
1047 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1050 gst_segment_set_newsegment (&parse->segment, update, rate,
1051 applied_rate, format, start, stop, start);
1054 /* save the segment for later, right before we push a new buffer so that
1055 * the caps are fixed and the next linked element can receive
1057 eventp = &parse->priv->pending_segment;
1058 gst_event_replace (eventp, event);
1059 gst_event_unref (event);
1062 /* but finish the current segment */
1063 GST_DEBUG_OBJECT (parse, "draining current segment");
1064 if (in_segment->rate > 0.0)
1065 gst_base_parse_drain (parse);
1067 gst_base_parse_process_fragment (parse, FALSE);
1068 gst_adapter_clear (parse->priv->adapter);
1070 parse->priv->offset = offset;
1071 parse->priv->sync_offset = offset;
1072 parse->priv->next_ts = next_ts;
1073 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1074 parse->priv->discont = TRUE;
1075 parse->priv->seen_keyframe = FALSE;
1079 case GST_EVENT_FLUSH_START:
1080 parse->priv->flushing = TRUE;
1081 handled = gst_pad_push_event (parse->srcpad, gst_event_ref (event));
1083 gst_event_unref (event);
1084 /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
1085 GST_PAD_STREAM_LOCK (parse->srcpad);
1086 GST_PAD_STREAM_UNLOCK (parse->srcpad);
1090 case GST_EVENT_FLUSH_STOP:
1091 gst_adapter_clear (parse->priv->adapter);
1092 gst_base_parse_clear_queues (parse);
1093 parse->priv->flushing = FALSE;
1094 parse->priv->discont = TRUE;
1095 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1096 parse->priv->frame._private_flags |=
1097 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
1098 gst_base_parse_frame_free (&parse->priv->frame);
1102 if (parse->segment.rate > 0.0)
1103 gst_base_parse_drain (parse);
1105 gst_base_parse_process_fragment (parse, FALSE);
1107 /* If we STILL have zero frames processed, fire an error */
1108 if (parse->priv->framecount == 0) {
1109 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1110 ("No valid frames found before end of stream"), (NULL));
1112 /* newsegment before eos */
1113 if (parse->priv->pending_segment) {
1114 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
1115 parse->priv->pending_segment = NULL;
1127 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1129 GstBaseParse *parse;
1130 GstBaseParseClass *bclass;
1133 parse = GST_BASE_PARSE (parent);
1134 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1136 switch (GST_QUERY_TYPE (query)) {
1137 case GST_QUERY_CAPS:
1139 if (bclass->get_sink_caps) {
1140 GstCaps *caps, *filter;
1142 gst_query_parse_caps (query, &filter);
1143 caps = bclass->get_sink_caps (parse, filter);
1144 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1146 gst_query_set_caps_result (query, caps);
1147 gst_caps_unref (caps);
1151 GstCaps *caps, *template_caps, *filter;
1153 gst_query_parse_caps (query, &filter);
1154 template_caps = gst_pad_get_pad_template_caps (pad);
1155 if (filter != NULL) {
1157 gst_caps_intersect_full (filter, template_caps,
1158 GST_CAPS_INTERSECT_FIRST);
1160 caps = gst_caps_copy (template_caps);
1162 gst_query_set_caps_result (query, caps);
1163 gst_caps_unref (caps);
1171 res = gst_pad_query_default (pad, parent, query);
1180 /* gst_base_parse_src_event:
1181 * @pad: #GstPad that received the event.
1182 * @event: #GstEvent that was received.
1184 * Handler for source pad events.
1186 * Returns: TRUE if the event was handled.
1189 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1191 GstBaseParse *parse;
1192 GstBaseParseClass *bclass;
1193 gboolean handled = FALSE;
1194 gboolean ret = TRUE;
1196 parse = GST_BASE_PARSE (parent);
1197 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1199 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1200 GST_EVENT_TYPE_NAME (event));
1202 if (bclass->src_event)
1203 handled = bclass->src_event (parse, event);
1206 ret = gst_pad_event_default (pad, parent, event);
1212 gst_base_parse_is_seekable (GstBaseParse * parse)
1214 /* FIXME: could do more here, e.g. check index or just send data from 0
1215 * in pull mode and let decoder/sink clip */
1216 return parse->priv->syncable;
1219 /* gst_base_parse_src_eventfunc:
1220 * @parse: #GstBaseParse.
1221 * @event: #GstEvent that was received.
1223 * Default srcpad event handler.
1225 * Returns: TRUE if the event was handled and can be dropped.
1228 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1230 gboolean handled = FALSE;
1232 switch (GST_EVENT_TYPE (event)) {
1233 case GST_EVENT_SEEK:
1235 if (gst_base_parse_is_seekable (parse)) {
1236 handled = gst_base_parse_handle_seek (parse, event);
1248 * gst_base_parse_convert_default:
1249 * @parse: #GstBaseParse.
1250 * @src_format: #GstFormat describing the source format.
1251 * @src_value: Source value to be converted.
1252 * @dest_format: #GstFormat defining the converted format.
1253 * @dest_value: Pointer where the conversion result will be put.
1255 * Default implementation of "convert" vmethod in #GstBaseParse class.
1257 * Returns: TRUE if conversion was successful.
1262 gst_base_parse_convert_default (GstBaseParse * parse,
1263 GstFormat src_format,
1264 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1266 gboolean ret = FALSE;
1267 guint64 bytes, duration;
1269 if (G_UNLIKELY (src_format == dest_format)) {
1270 *dest_value = src_value;
1274 if (G_UNLIKELY (src_value == -1)) {
1279 if (G_UNLIKELY (src_value == 0)) {
1284 /* need at least some frames */
1285 if (!parse->priv->framecount)
1288 duration = parse->priv->acc_duration / GST_MSECOND;
1289 bytes = parse->priv->bytecount;
1291 if (G_UNLIKELY (!duration || !bytes))
1294 if (src_format == GST_FORMAT_BYTES) {
1295 if (dest_format == GST_FORMAT_TIME) {
1296 /* BYTES -> TIME conversion */
1297 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1298 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1299 *dest_value *= GST_MSECOND;
1300 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1301 *dest_value / GST_MSECOND);
1304 } else if (src_format == GST_FORMAT_TIME) {
1305 if (dest_format == GST_FORMAT_BYTES) {
1306 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1307 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1309 GST_DEBUG_OBJECT (parse,
1310 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1311 src_value / GST_MSECOND, *dest_value);
1314 } else if (src_format == GST_FORMAT_DEFAULT) {
1315 /* DEFAULT == frame-based */
1316 if (dest_format == GST_FORMAT_TIME) {
1317 if (parse->priv->fps_den) {
1318 *dest_value = gst_util_uint64_scale (src_value,
1319 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1322 } else if (dest_format == GST_FORMAT_BYTES) {
1330 gst_base_parse_update_duration (GstBaseParse * baseparse)
1333 GstBaseParse *parse;
1335 parse = GST_BASE_PARSE (baseparse);
1337 peer = gst_pad_get_peer (parse->sinkpad);
1339 gboolean qres = FALSE;
1340 gint64 ptot, dest_value;
1342 qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot);
1343 gst_object_unref (GST_OBJECT (peer));
1345 if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1346 GST_FORMAT_TIME, &dest_value)) {
1348 /* inform if duration changed, but try to avoid spamming */
1349 parse->priv->estimated_drift +=
1350 dest_value - parse->priv->estimated_duration;
1351 if (parse->priv->estimated_drift > GST_SECOND ||
1352 parse->priv->estimated_drift < -GST_SECOND) {
1353 gst_element_post_message (GST_ELEMENT (parse),
1354 gst_message_new_duration (GST_OBJECT (parse),
1355 GST_FORMAT_TIME, dest_value));
1356 parse->priv->estimated_drift = 0;
1358 parse->priv->estimated_duration = dest_value;
1359 GST_LOG_OBJECT (parse,
1360 "updated estimated duration to %" GST_TIME_FORMAT,
1361 GST_TIME_ARGS (dest_value));
1368 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1369 gboolean post_avg, gboolean post_max)
1371 GstTagList *taglist = NULL;
1373 if (post_min && parse->priv->post_min_bitrate) {
1374 taglist = gst_tag_list_new_empty ();
1376 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1377 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1380 if (post_avg && parse->priv->post_avg_bitrate) {
1381 if (taglist == NULL)
1382 taglist = gst_tag_list_new_empty ();
1384 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1385 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1386 parse->priv->avg_bitrate, NULL);
1389 if (post_max && parse->priv->post_max_bitrate) {
1390 if (taglist == NULL)
1391 taglist = gst_tag_list_new_empty ();
1393 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1394 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1397 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1398 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1399 parse->priv->max_bitrate);
1401 if (taglist != NULL) {
1402 gst_pad_push_event (parse->srcpad, gst_event_new_tag (taglist));
1406 /* gst_base_parse_update_bitrates:
1407 * @parse: #GstBaseParse.
1408 * @buffer: Current frame as a #GstBuffer
1410 * Keeps track of the minimum and maximum bitrates, and also maintains a
1411 * running average bitrate of the stream so far.
1414 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1416 /* Only update the tag on a 10 kbps delta */
1417 static const gint update_threshold = 10000;
1419 guint64 data_len, frame_dur;
1420 gint overhead, frame_bitrate, old_avg_bitrate;
1421 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1422 GstBuffer *buffer = frame->buffer;
1424 overhead = frame->overhead;
1428 data_len = gst_buffer_get_size (buffer) - overhead;
1429 parse->priv->data_bytecount += data_len;
1431 /* duration should be valid by now,
1432 * either set by subclass or maybe based on fps settings */
1433 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1434 /* Calculate duration of a frame from buffer properties */
1435 frame_dur = GST_BUFFER_DURATION (buffer);
1436 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1437 parse->priv->acc_duration;
1440 /* No way to figure out frame duration (is this even possible?) */
1444 /* override if subclass provided bitrate, e.g. metadata based */
1445 if (parse->priv->bitrate) {
1446 parse->priv->avg_bitrate = parse->priv->bitrate;
1447 /* spread this (confirmed) info ASAP */
1448 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1449 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1453 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1457 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1458 parse->priv->avg_bitrate);
1460 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1462 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1463 /* always post all at threshold time */
1464 update_min = update_max = update_avg = TRUE;
1467 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1468 if (frame_bitrate < parse->priv->min_bitrate) {
1469 parse->priv->min_bitrate = frame_bitrate;
1473 if (frame_bitrate > parse->priv->max_bitrate) {
1474 parse->priv->max_bitrate = frame_bitrate;
1478 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1479 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1480 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1485 if ((update_min || update_avg || update_max))
1486 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1488 /* If average bitrate changes that much and no valid (time) duration provided,
1489 * then post a new duration message so applications can update their cached
1491 if (update_avg && !(parse->priv->duration_fmt == GST_FORMAT_TIME &&
1492 GST_CLOCK_TIME_IS_VALID (parse->priv->duration)))
1493 gst_element_post_message (GST_ELEMENT (parse),
1494 gst_message_new_duration (GST_OBJECT (parse), GST_FORMAT_TIME, -1));
1501 * gst_base_parse_add_index_entry:
1502 * @parse: #GstBaseParse.
1503 * @offset: offset of entry
1504 * @ts: timestamp associated with offset
1505 * @key: whether entry refers to keyframe
1506 * @force: add entry disregarding sanity checks
1508 * Adds an entry to the index associating @offset to @ts. It is recommended
1509 * to only add keyframe entries. @force allows to bypass checks, such as
1510 * whether the stream is (upstream) seekable, another entry is already "close"
1511 * to the new entry, etc.
1513 * Returns: #gboolean indicating whether entry was added
1518 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1519 GstClockTime ts, gboolean key, gboolean force)
1521 gboolean ret = FALSE;
1522 GstIndexAssociation associations[2];
1524 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1525 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1527 if (G_LIKELY (!force)) {
1529 if (!parse->priv->upstream_seekable) {
1530 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1534 /* FIXME need better helper data structure that handles these issues
1535 * related to ongoing collecting of index entries */
1536 if (parse->priv->index_last_offset >= (gint64) offset) {
1537 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1538 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1542 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1543 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1544 parse->priv->idx_interval) {
1545 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1546 GST_TIME_ARGS (parse->priv->index_last_ts));
1550 /* if last is not really the last one */
1551 if (!parse->priv->index_last_valid) {
1552 GstClockTime prev_ts;
1554 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1555 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1556 GST_DEBUG_OBJECT (parse,
1557 "entry too close to existing entry %" GST_TIME_FORMAT,
1558 GST_TIME_ARGS (prev_ts));
1559 parse->priv->index_last_offset = offset;
1560 parse->priv->index_last_ts = ts;
1566 associations[0].format = GST_FORMAT_TIME;
1567 associations[0].value = ts;
1568 associations[1].format = GST_FORMAT_BYTES;
1569 associations[1].value = offset;
1571 /* index might change on-the-fly, although that would be nutty app ... */
1572 g_static_mutex_lock (&parse->priv->index_lock);
1573 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1574 (key) ? GST_ASSOCIATION_FLAG_KEY_UNIT : GST_ASSOCIATION_FLAG_DELTA_UNIT,
1575 2, (const GstIndexAssociation *) &associations);
1576 g_static_mutex_unlock (&parse->priv->index_lock);
1579 parse->priv->index_last_offset = offset;
1580 parse->priv->index_last_ts = ts;
1589 /* check for seekable upstream, above and beyond a mere query */
1591 gst_base_parse_check_seekability (GstBaseParse * parse)
1594 gboolean seekable = FALSE;
1595 gint64 start = -1, stop = -1;
1596 guint idx_interval = 0;
1598 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1599 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1600 GST_DEBUG_OBJECT (parse, "seeking query failed");
1604 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1606 /* try harder to query upstream size if we didn't get it the first time */
1607 if (seekable && stop == -1) {
1608 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1609 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1612 /* if upstream doesn't know the size, it's likely that it's not seekable in
1613 * practice even if it technically may be seekable */
1614 if (seekable && (start != 0 || stop <= start)) {
1615 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1619 /* let's not put every single frame into our index */
1621 if (stop < 10 * 1024 * 1024)
1623 else if (stop < 100 * 1024 * 1024)
1626 idx_interval = 1000;
1630 gst_query_unref (query);
1632 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1633 G_GUINT64_FORMAT ")", seekable, start, stop);
1634 parse->priv->upstream_seekable = seekable;
1635 parse->priv->upstream_size = seekable ? stop : 0;
1637 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1638 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1641 /* some misc checks on upstream */
1643 gst_base_parse_check_upstream (GstBaseParse * parse)
1647 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
1648 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1649 /* upstream has one, accept it also, and no further updates */
1650 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1651 parse->priv->upstream_has_duration = TRUE;
1654 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1655 parse->priv->upstream_has_duration);
1658 /* checks src caps to determine if dealing with audio or video */
1659 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1661 gst_base_parse_check_media (GstBaseParse * parse)
1666 caps = gst_pad_get_current_caps (parse->srcpad);
1667 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1668 parse->priv->is_video =
1669 g_str_has_prefix (gst_structure_get_name (s), "video");
1671 /* historical default */
1672 parse->priv->is_video = FALSE;
1675 gst_caps_unref (caps);
1677 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1680 /* takes ownership of frame */
1682 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1684 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1685 /* frame allocated on the heap, we can just take ownership */
1686 g_queue_push_tail (&parse->priv->queued_frames, frame);
1687 GST_TRACE ("queued frame %p", frame);
1689 GstBaseParseFrame *copy;
1691 /* probably allocated on the stack, must make a proper copy */
1692 copy = gst_base_parse_frame_copy (frame);
1693 g_queue_push_tail (&parse->priv->queued_frames, copy);
1694 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1695 gst_base_parse_frame_free (frame);
1699 /* gst_base_parse_handle_and_push_buffer:
1700 * @parse: #GstBaseParse.
1701 * @klass: #GstBaseParseClass.
1702 * @frame: (transfer full): a #GstBaseParseFrame
1704 * Parses the frame from given buffer and pushes it forward. Also performs
1705 * timestamp handling and checks the segment limits.
1707 * This is called with srcpad STREAM_LOCK held.
1709 * Returns: #GstFlowReturn
1711 static GstFlowReturn
1712 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1713 GstBaseParseClass * klass, GstBaseParseFrame * frame)
1719 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1721 buffer = frame->buffer;
1723 if (parse->priv->discont) {
1724 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1725 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1726 parse->priv->discont = FALSE;
1729 /* some one-time start-up */
1730 if (G_UNLIKELY (!parse->priv->framecount)) {
1731 gst_base_parse_check_seekability (parse);
1732 gst_base_parse_check_upstream (parse);
1735 GST_LOG_OBJECT (parse,
1736 "parsing frame at offset %" G_GUINT64_FORMAT
1737 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
1738 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1739 gst_buffer_get_size (buffer));
1741 /* use default handler to provide initial (upstream) metadata */
1742 gst_base_parse_parse_frame (parse, frame);
1744 /* store offset as it might get overwritten */
1745 offset = GST_BUFFER_OFFSET (buffer);
1746 ret = klass->parse_frame (parse, frame);
1748 buffer = frame->buffer;
1749 /* subclass must play nice */
1750 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1752 /* check if subclass/format can provide ts.
1753 * If so, that allows and enables extra seek and duration determining options */
1754 if (G_UNLIKELY (parse->priv->first_frame_offset < 0 && ret == GST_FLOW_OK)) {
1755 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1756 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1757 parse->priv->first_frame_offset = offset;
1758 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1759 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1760 " for first frame at offset %" G_GINT64_FORMAT,
1761 GST_TIME_ARGS (parse->priv->first_frame_ts),
1762 parse->priv->first_frame_offset);
1763 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1765 GstClockTime last_ts = G_MAXINT64;
1767 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1768 gst_base_parse_locate_time (parse, &last_ts, &off);
1769 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1770 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1773 /* disable further checks */
1774 parse->priv->first_frame_offset = 0;
1778 /* again use default handler to add missing metadata;
1779 * we may have new information on frame properties */
1780 gst_base_parse_parse_frame (parse, frame);
1781 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1782 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1783 parse->priv->next_ts =
1784 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1786 /* we lost track, do not produce bogus time next time around
1787 * (probably means parser subclass has given up on parsing as well) */
1788 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1789 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1792 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1793 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1794 gst_base_parse_add_index_entry (parse, offset,
1795 GST_BUFFER_TIMESTAMP (buffer),
1796 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1798 /* First buffers are dropped, this means that the subclass needs more
1799 * frames to decide on the format and queues them internally */
1800 /* convert internal flow to OK and mark discont for the next buffer. */
1801 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1802 gst_base_parse_frame_free (frame);
1804 } else if (ret == GST_BASE_PARSE_FLOW_QUEUED) {
1805 gst_base_parse_queue_frame (parse, frame);
1807 } else if (ret != GST_FLOW_OK) {
1811 /* All OK, push queued frames if there are any */
1812 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1813 GstBaseParseFrame *queued_frame;
1815 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1816 gst_base_parse_push_frame (parse, queued_frame);
1820 return gst_base_parse_push_frame (parse, frame);
1824 * gst_base_parse_push_frame:
1825 * @parse: #GstBaseParse.
1826 * @frame: (transfer full): a #GstBaseParseFrame
1828 * Pushes the frame downstream, sends any pending events and
1829 * does some timestamp and segment handling. Takes ownership
1830 * of @frame and will clear it (if it was initialised with
1831 * gst_base_parse_frame_init()) or free it.
1833 * This must be called with sinkpad STREAM_LOCK held.
1835 * Returns: #GstFlowReturn
1840 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1842 GstFlowReturn ret = GST_FLOW_OK;
1843 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1844 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1845 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1849 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1850 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1852 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1854 buffer = frame->buffer;
1856 GST_LOG_OBJECT (parse,
1857 "processing buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT
1858 ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer),
1859 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1860 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1863 size = gst_buffer_get_size (buffer);
1864 parse->priv->bytecount += size;
1865 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1866 parse->priv->framecount++;
1867 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1868 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1871 /* 0 means disabled */
1872 if (parse->priv->update_interval < 0)
1873 parse->priv->update_interval = 50;
1874 else if (parse->priv->update_interval > 0 &&
1875 (parse->priv->framecount % parse->priv->update_interval) == 0)
1876 gst_base_parse_update_duration (parse);
1878 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1879 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1880 if (last_start != GST_CLOCK_TIME_NONE
1881 && GST_BUFFER_DURATION_IS_VALID (buffer))
1882 last_stop = last_start + GST_BUFFER_DURATION (buffer);
1884 /* should have caps by now */
1885 g_return_val_if_fail (gst_pad_has_current_caps (parse->srcpad),
1888 /* segment adjustment magic; only if we are running the whole show */
1889 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
1890 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
1891 parse->priv->upstream_seekable)) {
1892 /* segment times are typically estimates,
1893 * actual frame data might lead subclass to different timestamps,
1894 * so override segment start from what is supplied there */
1895 if (G_UNLIKELY (parse->priv->pending_segment && !parse->priv->exact_position
1896 && GST_CLOCK_TIME_IS_VALID (last_start))) {
1897 gst_event_unref (parse->priv->pending_segment);
1898 parse->segment.start =
1899 MIN ((guint64) last_start, (guint64) parse->segment.stop);
1901 GST_DEBUG_OBJECT (parse,
1902 "adjusting pending segment start to %" GST_TIME_FORMAT,
1903 GST_TIME_ARGS (parse->segment.start));
1905 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
1907 /* handle gaps, e.g. non-zero start-time, in as much not handled by above */
1908 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
1909 GST_CLOCK_TIME_IS_VALID (last_start)) {
1910 GstClockTimeDiff diff;
1912 /* only send newsegments with increasing start times,
1913 * otherwise if these go back and forth downstream (sinks) increase
1914 * accumulated time and running_time */
1915 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
1916 if (G_UNLIKELY (diff > 2 * GST_SECOND
1917 && last_start > parse->segment.start
1918 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
1919 || last_start < parse->segment.stop))) {
1921 GST_DEBUG_OBJECT (parse,
1922 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
1923 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
1924 "Sending updated NEWSEGMENT events", diff,
1925 GST_TIME_ARGS (parse->segment.position),
1926 GST_TIME_ARGS (last_start));
1928 if (G_UNLIKELY (parse->priv->pending_segment)) {
1929 gst_event_unref (parse->priv->pending_segment);
1930 parse->segment.start = last_start;
1931 parse->segment.time = last_start;
1932 parse->priv->pending_segment =
1933 gst_event_new_segment (&parse->segment);
1935 /* skip gap FIXME */
1936 gst_pad_push_event (parse->srcpad,
1937 gst_event_new_segment (&parse->segment));
1939 parse->segment.position = last_start;
1944 /* and should then also be linked downstream, so safe to send some events */
1945 if (G_UNLIKELY (parse->priv->close_segment)) {
1946 /* only set up by loop */
1947 GST_DEBUG_OBJECT (parse, "loop sending close segment");
1948 gst_pad_push_event (parse->srcpad, parse->priv->close_segment);
1949 parse->priv->close_segment = NULL;
1951 if (G_UNLIKELY (parse->priv->pending_segment)) {
1952 GstEvent *pending_segment;
1954 pending_segment = parse->priv->pending_segment;
1955 parse->priv->pending_segment = NULL;
1957 GST_DEBUG_OBJECT (parse, "%s push pending segment",
1958 parse->priv->pad_mode == GST_PAD_MODE_PULL ? "loop" : "chain");
1959 gst_pad_push_event (parse->srcpad, pending_segment);
1961 /* have caps; check identity */
1962 gst_base_parse_check_media (parse);
1965 /* update bitrates and optionally post corresponding tags
1966 * (following newsegment) */
1967 gst_base_parse_update_bitrates (parse, frame);
1969 if (G_UNLIKELY (parse->priv->pending_events)) {
1972 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
1973 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
1975 g_list_free (parse->priv->pending_events);
1976 parse->priv->pending_events = NULL;
1979 if (klass->pre_push_frame) {
1980 ret = klass->pre_push_frame (parse, frame);
1982 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
1985 /* take final ownership of frame buffer */
1986 buffer = frame->buffer;
1987 frame->buffer = NULL;
1989 /* subclass must play nice */
1990 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1992 parse->priv->seen_keyframe |= parse->priv->is_video &&
1993 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
1995 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
1996 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1997 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
1998 GST_BUFFER_TIMESTAMP (buffer) >
1999 parse->segment.stop + parse->priv->lead_out_ts) {
2000 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
2002 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2003 GST_BUFFER_DURATION_IS_VALID (buffer) &&
2004 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
2005 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
2006 parse->priv->lead_in_ts < parse->segment.start) {
2007 if (parse->priv->seen_keyframe) {
2008 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
2011 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
2012 ret = GST_BASE_PARSE_FLOW_DROPPED;
2019 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2020 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2021 gst_buffer_unref (buffer);
2023 } else if (ret == GST_FLOW_OK) {
2024 if (parse->segment.rate > 0.0) {
2025 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2027 ret = gst_pad_push (parse->srcpad, buffer);
2028 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2030 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2032 parse->priv->buffers_queued =
2033 g_slist_prepend (parse->priv->buffers_queued, buffer);
2037 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2038 size, gst_flow_get_name (ret));
2039 gst_buffer_unref (buffer);
2040 /* if we are not sufficiently in control, let upstream decide on EOS */
2041 if (ret == GST_FLOW_EOS &&
2042 (parse->priv->passthrough ||
2043 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2044 !parse->priv->upstream_seekable)))
2048 /* Update current running segment position */
2049 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
2050 parse->segment.position < last_stop)
2051 parse->segment.position = last_stop;
2053 gst_base_parse_frame_free (frame);
2059 /* gst_base_parse_drain:
2061 * Drains the adapter until it is empty. It decreases the min_frame_size to
2062 * match the current adapter size and calls chain method until the adapter
2063 * is emptied or chain returns with error.
2066 gst_base_parse_drain (GstBaseParse * parse)
2070 GST_DEBUG_OBJECT (parse, "draining");
2071 parse->priv->drain = TRUE;
2074 avail = gst_adapter_available (parse->priv->adapter);
2078 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2079 NULL) != GST_FLOW_OK) {
2083 /* nothing changed, maybe due to truncated frame; break infinite loop */
2084 if (avail == gst_adapter_available (parse->priv->adapter)) {
2085 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2086 gst_adapter_clear (parse->priv->adapter);
2090 parse->priv->drain = FALSE;
2093 /* gst_base_parse_send_buffers
2095 * Sends buffers collected in send_buffers downstream, and ensures that list
2096 * is empty at the end (errors or not).
2098 static GstFlowReturn
2099 gst_base_parse_send_buffers (GstBaseParse * parse)
2101 GSList *send = NULL;
2103 GstFlowReturn ret = GST_FLOW_OK;
2105 send = parse->priv->buffers_send;
2109 buf = GST_BUFFER_CAST (send->data);
2110 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
2111 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2112 ", offset %" G_GINT64_FORMAT, buf,
2113 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
2114 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2116 /* iterate output queue an push downstream */
2117 ret = gst_pad_push (parse->srcpad, buf);
2118 send = g_slist_delete_link (send, send);
2120 /* clear any leftover if error */
2121 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2123 buf = GST_BUFFER_CAST (send->data);
2124 gst_buffer_unref (buf);
2125 send = g_slist_delete_link (send, send);
2130 parse->priv->buffers_send = send;
2135 /* gst_base_parse_process_fragment:
2137 * Processes a reverse playback (forward) fragment:
2138 * - append head of last fragment that was skipped to current fragment data
2139 * - drain the resulting current fragment data (i.e. repeated chain)
2140 * - add time/duration (if needed) to frames queued by chain
2141 * - push queued data
2143 static GstFlowReturn
2144 gst_base_parse_process_fragment (GstBaseParse * parse, gboolean push_only)
2147 GstFlowReturn ret = GST_FLOW_OK;
2148 gboolean seen_key = FALSE, seen_delta = FALSE;
2154 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2155 while (parse->priv->buffers_pending) {
2156 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2157 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2158 gst_buffer_get_size (buf));
2159 gst_adapter_push (parse->priv->adapter, buf);
2160 parse->priv->buffers_pending =
2161 g_slist_delete_link (parse->priv->buffers_pending,
2162 parse->priv->buffers_pending);
2165 /* invalidate so no fall-back timestamping is performed;
2166 * ok if taken from subclass or upstream */
2167 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2168 /* prevent it hanging around stop all the time */
2169 parse->segment.position = GST_CLOCK_TIME_NONE;
2171 parse->priv->discont = TRUE;
2173 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2174 /* initial skipped data is added to buffers_pending */
2175 gst_base_parse_drain (parse);
2178 if (parse->priv->buffers_send) {
2179 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2180 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2183 /* add metadata (if needed to queued buffers */
2184 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2185 GST_TIME_ARGS (parse->priv->last_ts));
2186 while (parse->priv->buffers_queued) {
2187 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2189 /* no touching if upstream or parsing provided time */
2190 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2191 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2192 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2193 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2194 GST_BUFFER_DURATION_IS_VALID (buf)) {
2195 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2196 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2198 parse->priv->last_ts = 0;
2199 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2200 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2201 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2203 /* no idea, very bad */
2204 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2207 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2209 /* reverse order for ascending sending */
2210 /* send downstream at keyframe not preceded by a keyframe
2211 * (e.g. that should identify start of collection of IDR nals) */
2212 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2214 ret = gst_base_parse_send_buffers (parse);
2215 /* if a problem, throw all to sending */
2216 if (ret != GST_FLOW_OK) {
2217 parse->priv->buffers_send =
2218 g_slist_reverse (parse->priv->buffers_queued);
2219 parse->priv->buffers_queued = NULL;
2228 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2230 parse->priv->buffers_send =
2231 g_slist_prepend (parse->priv->buffers_send, buf);
2232 parse->priv->buffers_queued =
2233 g_slist_delete_link (parse->priv->buffers_queued,
2234 parse->priv->buffers_queued);
2237 /* audio may have all marked as keyframe, so arrange to send here */
2239 ret = gst_base_parse_send_buffers (parse);
2241 /* any trailing unused no longer usable (ideally none) */
2242 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2243 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2244 gst_adapter_available (parse->priv->adapter));
2245 gst_adapter_clear (parse->priv->adapter);
2251 /* small helper that checks whether we have been trying to resync too long */
2252 static inline GstFlowReturn
2253 gst_base_parse_check_sync (GstBaseParse * parse)
2255 if (G_UNLIKELY (parse->priv->discont &&
2256 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2257 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2258 ("Failed to parse stream"), (NULL));
2259 return GST_FLOW_ERROR;
2265 static GstFlowReturn
2266 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
2268 GstBaseParseClass *bclass;
2269 GstBaseParse *parse;
2270 GstFlowReturn ret = GST_FLOW_OK;
2271 GstBuffer *outbuf = NULL;
2272 GstBuffer *tmpbuf = NULL;
2276 guint old_min_size = 0, min_size, av;
2277 GstClockTime timestamp;
2278 GstBaseParseFrame *frame;
2280 parse = GST_BASE_PARSE (parent);
2281 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2283 if (parse->priv->detecting) {
2284 GstBuffer *detect_buf;
2286 if (parse->priv->detect_buffers_size == 0) {
2287 detect_buf = gst_buffer_ref (buffer);
2292 detect_buf = gst_buffer_new ();
2294 for (l = parse->priv->detect_buffers; l; l = l->next) {
2295 gsize tmpsize = gst_buffer_get_size (l->data);
2297 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
2298 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
2302 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
2303 offset, gst_buffer_get_size (buffer));
2306 ret = bclass->detect (parse, detect_buf);
2307 gst_buffer_unref (detect_buf);
2309 if (ret == GST_FLOW_OK) {
2312 /* Detected something */
2313 parse->priv->detecting = FALSE;
2315 for (l = parse->priv->detect_buffers; l; l = l->next) {
2316 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2318 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2319 parent, GST_BUFFER_CAST (l->data));
2321 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2323 g_list_free (parse->priv->detect_buffers);
2324 parse->priv->detect_buffers = NULL;
2325 parse->priv->detect_buffers_size = 0;
2327 if (ret != GST_FLOW_OK) {
2331 /* Handle the current buffer */
2332 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2333 /* Still detecting, append buffer or error out if draining */
2335 if (parse->priv->drain) {
2336 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2337 return GST_FLOW_ERROR;
2338 } else if (parse->priv->flushing) {
2339 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2341 g_list_free (parse->priv->detect_buffers);
2342 parse->priv->detect_buffers = NULL;
2343 parse->priv->detect_buffers_size = 0;
2345 parse->priv->detect_buffers =
2346 g_list_append (parse->priv->detect_buffers, buffer);
2347 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
2351 /* Something went wrong, subclass responsible for error reporting */
2355 /* And now handle the current buffer if detection worked */
2358 frame = &parse->priv->frame;
2360 if (G_LIKELY (buffer)) {
2361 GST_LOG_OBJECT (parse,
2362 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT,
2363 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer));
2364 if (G_UNLIKELY (parse->priv->passthrough)) {
2365 gst_base_parse_frame_init (frame);
2366 frame->buffer = gst_buffer_make_writable (buffer);
2367 return gst_base_parse_push_frame (parse, frame);
2369 /* upstream feeding us in reverse playback;
2370 * gather each fragment, then process it in single run */
2371 if (parse->segment.rate < 0.0) {
2372 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2373 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2374 ret = gst_base_parse_process_fragment (parse, FALSE);
2376 gst_adapter_push (parse->priv->adapter, buffer);
2379 gst_adapter_push (parse->priv->adapter, buffer);
2382 if (G_UNLIKELY (buffer &&
2383 GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2384 frame->_private_flags |= GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
2385 gst_base_parse_frame_free (frame);
2388 /* Parse and push as many frames as possible */
2389 /* Stop either when adapter is empty or we are flushing */
2390 while (!parse->priv->flushing) {
2393 /* maintain frame state for a single frame parsing round across _chain calls,
2394 * so only init when needed */
2395 if (!frame->_private_flags)
2396 gst_base_parse_frame_init (frame);
2398 tmpbuf = gst_buffer_new ();
2401 /* Synchronization loop */
2403 /* note: if subclass indicates MAX fsize,
2404 * this will not likely be available anyway ... */
2405 min_size = MAX (parse->priv->min_frame_size, fsize);
2406 av = gst_adapter_available (parse->priv->adapter);
2408 /* loop safety check */
2409 if (G_UNLIKELY (old_min_size >= min_size))
2411 old_min_size = min_size;
2413 if (G_UNLIKELY (parse->priv->drain)) {
2415 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2416 if (G_UNLIKELY (!min_size)) {
2417 gst_buffer_unref (tmpbuf);
2422 /* Collect at least min_frame_size bytes */
2423 if (av < min_size) {
2424 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)",
2426 gst_buffer_unref (tmpbuf);
2430 /* always pass all available data */
2431 data = gst_adapter_map (parse->priv->adapter, av);
2432 gst_buffer_take_memory (tmpbuf, -1,
2433 gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY,
2434 (gpointer) data, NULL, av, 0, av));
2435 GST_BUFFER_OFFSET (tmpbuf) = parse->priv->offset;
2437 if (parse->priv->discont) {
2438 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2439 GST_BUFFER_FLAG_SET (tmpbuf, GST_BUFFER_FLAG_DISCONT);
2443 gst_base_parse_frame_update (parse, frame, tmpbuf);
2444 res = bclass->check_valid_frame (parse, frame, &fsize, &skip);
2445 gst_adapter_unmap (parse->priv->adapter);
2446 gst_buffer_replace (&frame->buffer, NULL);
2447 gst_buffer_remove_memory_range (tmpbuf, 0, -1);
2449 if (gst_adapter_available (parse->priv->adapter) < fsize) {
2450 GST_DEBUG_OBJECT (parse, "found valid frame but not enough data"
2451 " available (only %" G_GSIZE_FORMAT " bytes)",
2452 gst_adapter_available (parse->priv->adapter));
2453 gst_buffer_unref (tmpbuf);
2456 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2460 /* subclass didn't touch this value. By default we skip 1 byte */
2464 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2465 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2466 /* reverse playback, and no frames found yet, so we are skipping
2467 * the leading part of a fragment, which may form the tail of
2468 * fragment coming later, hopefully subclass skips efficiently ... */
2469 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2470 outbuf = gst_adapter_take_buffer (parse->priv->adapter, skip);
2471 outbuf = gst_buffer_make_writable (outbuf);
2472 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
2473 parse->priv->buffers_pending =
2474 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2477 gst_adapter_flush (parse->priv->adapter, skip);
2479 parse->priv->offset += skip;
2480 if (!parse->priv->discont)
2481 parse->priv->sync_offset = parse->priv->offset;
2482 parse->priv->discont = TRUE;
2483 /* something changed least; nullify loop check */
2486 /* skip == 0 should imply subclass set min_size to need more data;
2487 * we check this shortly */
2488 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2489 gst_buffer_unref (tmpbuf);
2493 gst_buffer_unref (tmpbuf);
2497 /* Subclass found the sync, but still wants to skip some data */
2498 GST_LOG_OBJECT (parse, "skipping %d bytes", skip);
2499 gst_adapter_flush (parse->priv->adapter, skip);
2500 parse->priv->offset += skip;
2503 /* Grab lock to prevent a race with FLUSH_START handler */
2504 GST_PAD_STREAM_LOCK (parse->srcpad);
2506 /* FLUSH_START event causes the "flushing" flag to be set. In this
2507 * case we can leave the frame pushing loop */
2508 if (parse->priv->flushing) {
2509 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2513 /* move along with upstream timestamp (if any),
2514 * but interpolate in between */
2515 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2516 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2517 (parse->priv->prev_ts != timestamp)) {
2518 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2521 /* FIXME: Would it be more efficient to make a subbuffer instead? */
2522 outbuf = gst_adapter_take_buffer (parse->priv->adapter, fsize);
2523 outbuf = gst_buffer_make_writable (outbuf);
2525 /* Subclass may want to know the data offset */
2526 GST_BUFFER_OFFSET (outbuf) = parse->priv->offset;
2527 parse->priv->offset += fsize;
2528 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2529 GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
2531 frame->buffer = outbuf;
2532 ret = gst_base_parse_handle_and_push_frame (parse, bclass, frame);
2533 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2535 if (ret != GST_FLOW_OK) {
2536 GST_LOG_OBJECT (parse, "push returned %d", ret);
2542 GST_LOG_OBJECT (parse, "chain leaving");
2548 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2549 ("min_size evolution %d -> %d; breaking to avoid looping",
2550 old_min_size, min_size));
2551 return GST_FLOW_ERROR;
2555 /* pull @size bytes at current offset,
2556 * i.e. at least try to and possibly return a shorter buffer if near the end */
2557 static GstFlowReturn
2558 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2559 GstBuffer ** buffer)
2561 GstFlowReturn ret = GST_FLOW_OK;
2563 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2565 /* Caching here actually makes much less difference than one would expect.
2566 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2567 if (parse->priv->cache) {
2568 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2569 gint cache_size = gst_buffer_get_size (parse->priv->cache);
2571 if (cache_offset <= parse->priv->offset &&
2572 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2573 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
2574 parse->priv->offset - cache_offset, size);
2575 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2578 /* not enough data in the cache, free cache and get a new one */
2579 gst_buffer_unref (parse->priv->cache);
2580 parse->priv->cache = NULL;
2583 /* refill the cache */
2585 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2586 64 * 1024), &parse->priv->cache);
2587 if (ret != GST_FLOW_OK) {
2588 parse->priv->cache = NULL;
2592 if (gst_buffer_get_size (parse->priv->cache) >= size) {
2594 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
2596 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2600 /* Not possible to get enough data, try a last time with
2601 * requesting exactly the size we need */
2602 gst_buffer_unref (parse->priv->cache);
2603 parse->priv->cache = NULL;
2605 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2606 &parse->priv->cache);
2608 if (ret != GST_FLOW_OK) {
2609 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2614 if (gst_buffer_get_size (parse->priv->cache) < size) {
2615 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2616 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
2617 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
2619 *buffer = parse->priv->cache;
2620 parse->priv->cache = NULL;
2626 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
2627 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2632 static GstFlowReturn
2633 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2636 GstClockTime ts = 0;
2640 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2641 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2642 parse->priv->last_offset);
2644 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2645 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2646 GST_TIME_ARGS (parse->segment.start));
2651 /* last fragment started at last_offset / last_ts;
2652 * seek back 10s capped at 1MB */
2653 if (parse->priv->last_ts >= 10 * GST_SECOND)
2654 ts = parse->priv->last_ts - 10 * GST_SECOND;
2655 /* if we are exact now, we will be more so going backwards */
2656 if (parse->priv->exact_position) {
2657 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2659 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2660 GST_FORMAT_BYTES, &offset)) {
2661 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2664 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2665 parse->priv->last_offset - 1024);
2666 offset = MAX (0, offset);
2668 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2670 parse->priv->offset = offset;
2672 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2674 if (ret != GST_FLOW_OK)
2677 /* offset will increase again as fragment is processed/parsed */
2678 parse->priv->last_offset = offset;
2680 gst_adapter_push (parse->priv->adapter, buffer);
2681 ret = gst_base_parse_process_fragment (parse, FALSE);
2682 if (ret != GST_FLOW_OK)
2685 /* force previous fragment */
2686 parse->priv->offset = -1;
2693 * pull and scan for next frame starting from current offset
2694 * ajusts sync, drain and offset going along */
2695 static GstFlowReturn
2696 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2697 GstBaseParseFrame * frame, gboolean full)
2699 GstBuffer *buffer, *outbuf;
2700 GstFlowReturn ret = GST_FLOW_OK;
2701 guint fsize = 1, min_size, old_min_size = 0;
2704 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2706 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2707 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2709 /* let's make this efficient for all subclass once and for all;
2710 * maybe it does not need this much, but in the latter case, we know we are
2711 * in pull mode here and might as well try to read and supply more anyway
2712 * (so does the buffer caching mechanism) */
2718 min_size = MAX (parse->priv->min_frame_size, fsize);
2719 /* loop safety check */
2720 if (G_UNLIKELY (old_min_size >= min_size))
2722 old_min_size = min_size;
2724 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2725 if (ret != GST_FLOW_OK)
2728 if (parse->priv->discont) {
2729 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2730 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
2733 /* if we got a short read, inform subclass we are draining leftover
2734 * and no more is to be expected */
2735 if (gst_buffer_get_size (buffer) < min_size)
2736 parse->priv->drain = TRUE;
2738 if (parse->priv->detecting) {
2739 ret = klass->detect (parse, buffer);
2740 if (ret == GST_FLOW_NOT_NEGOTIATED) {
2741 /* If draining we error out, otherwise request a buffer
2743 if (parse->priv->drain) {
2744 gst_buffer_unref (buffer);
2745 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
2746 return GST_FLOW_ERROR;
2749 gst_buffer_unref (buffer);
2752 } else if (ret != GST_FLOW_OK) {
2753 gst_buffer_unref (buffer);
2754 GST_ERROR_OBJECT (parse, "detect() returned %s",
2755 gst_flow_get_name (ret));
2759 /* Else handle this buffer normally */
2763 gst_base_parse_frame_update (parse, frame, buffer);
2764 res = klass->check_valid_frame (parse, frame, &fsize, &skip);
2765 gst_buffer_replace (&frame->buffer, NULL);
2767 parse->priv->drain = FALSE;
2768 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2771 parse->priv->drain = FALSE;
2775 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2776 if (full && parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2777 /* reverse playback, and no frames found yet, so we are skipping
2778 * the leading part of a fragment, which may form the tail of
2779 * fragment coming later, hopefully subclass skips efficiently ... */
2780 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, 0, skip);
2781 parse->priv->buffers_pending =
2782 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2785 parse->priv->offset += skip;
2786 if (!parse->priv->discont)
2787 parse->priv->sync_offset = parse->priv->offset;
2788 parse->priv->discont = TRUE;
2789 /* something changed at least; nullify loop check */
2790 if (fsize == G_MAXUINT)
2791 fsize = old_min_size + 64 * 1024;
2794 /* skip == 0 should imply subclass set min_size to need more data;
2795 * we check this shortly */
2796 GST_DEBUG_OBJECT (parse, "finding sync...");
2797 gst_buffer_unref (buffer);
2798 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2803 /* Does the subclass want to skip too? */
2805 parse->priv->offset += skip;
2809 if (fsize + skip <= gst_buffer_get_size (buffer)) {
2810 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, skip, fsize);
2811 GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer) + skip;
2812 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2813 gst_buffer_unref (buffer);
2815 gst_buffer_unref (buffer);
2816 ret = gst_base_parse_pull_range (parse, fsize, &outbuf);
2817 if (ret != GST_FLOW_OK)
2819 if (gst_buffer_get_size (outbuf) < fsize) {
2820 gst_buffer_unref (outbuf);
2825 parse->priv->offset += fsize;
2827 frame->buffer = outbuf;
2835 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2836 ("min_size evolution %d -> %d; breaking to avoid looping",
2837 old_min_size, min_size));
2838 return GST_FLOW_ERROR;
2842 /* Loop that is used in pull mode to retrieve data from upstream */
2844 gst_base_parse_loop (GstPad * pad)
2846 GstBaseParse *parse;
2847 GstBaseParseClass *klass;
2848 GstFlowReturn ret = GST_FLOW_OK;
2849 GstBaseParseFrame frame;
2851 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2852 klass = GST_BASE_PARSE_GET_CLASS (parse);
2854 /* reverse playback:
2855 * first fragment (closest to stop time) is handled normally below,
2856 * then we pull in fragments going backwards */
2857 if (parse->segment.rate < 0.0) {
2858 /* check if we jumped back to a previous fragment,
2859 * which is a post-first fragment */
2860 if (parse->priv->offset < 0) {
2861 ret = gst_base_parse_handle_previous_fragment (parse);
2866 gst_base_parse_frame_init (&frame);
2867 ret = gst_base_parse_scan_frame (parse, klass, &frame, TRUE);
2868 if (ret != GST_FLOW_OK)
2871 /* This always cleans up frame, even if error occurs */
2872 ret = gst_base_parse_handle_and_push_frame (parse, klass, &frame);
2874 /* eat expected eos signalling past segment in reverse playback */
2875 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
2876 parse->segment.position >= parse->segment.stop) {
2877 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2878 /* push what was accumulated during loop run */
2879 gst_base_parse_process_fragment (parse, TRUE);
2880 /* force previous fragment */
2881 parse->priv->offset = -1;
2886 if (ret == GST_FLOW_EOS)
2888 else if (ret != GST_FLOW_OK)
2891 gst_object_unref (parse);
2898 GST_DEBUG_OBJECT (parse, "eos");
2903 gboolean push_eos = FALSE;
2905 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2906 gst_flow_get_name (ret));
2907 gst_pad_pause_task (parse->sinkpad);
2909 if (ret == GST_FLOW_EOS) {
2910 /* handle end-of-stream/segment */
2911 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2914 if ((stop = parse->segment.stop) == -1)
2915 stop = parse->segment.duration;
2917 GST_DEBUG_OBJECT (parse, "sending segment_done");
2919 gst_element_post_message
2920 (GST_ELEMENT_CAST (parse),
2921 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2922 GST_FORMAT_TIME, stop));
2924 /* If we STILL have zero frames processed, fire an error */
2925 if (parse->priv->framecount == 0) {
2926 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2927 ("No valid frames found before end of stream"), (NULL));
2931 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
2932 /* for fatal errors we post an error message, wrong-state is
2933 * not fatal because it happens due to flushes and only means
2934 * that we should stop now. */
2935 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2936 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
2940 /* newsegment before eos */
2941 if (parse->priv->pending_segment) {
2942 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
2943 parse->priv->pending_segment = NULL;
2945 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
2947 gst_object_unref (parse);
2952 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
2954 GstBaseParse *parse;
2955 gboolean result = TRUE;
2959 parse = GST_BASE_PARSE (parent);
2961 GST_DEBUG_OBJECT (parse, "sink activate");
2963 query = gst_query_new_scheduling ();
2964 result = gst_pad_peer_query (sinkpad, query);
2966 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL);
2970 gst_query_unref (query);
2973 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
2974 result = gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE);
2976 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
2977 result = gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
2980 GST_DEBUG_OBJECT (parse, "sink activate return %d", result);
2985 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
2987 GstBaseParseClass *klass;
2988 gboolean result = TRUE;
2990 GST_DEBUG_OBJECT (parse, "activate %d", active);
2992 klass = GST_BASE_PARSE_GET_CLASS (parse);
2995 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
2996 result = klass->start (parse);
2998 /* If the subclass implements ::detect we want to
2999 * call it for the first buffers now */
3000 parse->priv->detecting = (klass->detect != NULL);
3002 /* We must make sure streaming has finished before resetting things
3003 * and calling the ::stop vfunc */
3004 GST_PAD_STREAM_LOCK (parse->sinkpad);
3005 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3007 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
3008 result = klass->stop (parse);
3010 parse->priv->pad_mode = GST_PAD_MODE_NONE;
3012 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
3017 gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
3018 GstPadMode mode, gboolean active)
3020 gboolean result = TRUE;
3021 GstBaseParse *parse;
3023 parse = GST_BASE_PARSE (parent);
3025 GST_DEBUG_OBJECT (parse, "sink activate mode %d, %d", mode, active);
3027 result = gst_base_parse_activate (parse, active);
3031 case GST_PAD_MODE_PULL:
3033 parse->priv->pending_segment =
3034 gst_event_new_segment (&parse->segment);
3036 gst_pad_start_task (pad, (GstTaskFunction) gst_base_parse_loop,
3039 result &= gst_pad_stop_task (pad);
3047 parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
3049 GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
3055 * gst_base_parse_set_duration:
3056 * @parse: #GstBaseParse.
3058 * @duration: duration value.
3059 * @interval: how often to update the duration estimate based on bitrate, or 0.
3061 * Sets the duration of the currently playing media. Subclass can use this
3062 * when it is able to determine duration and/or notices a change in the media
3063 * duration. Alternatively, if @interval is non-zero (default), then stream
3064 * duration is determined based on estimated bitrate, and updated every @interval
3070 gst_base_parse_set_duration (GstBaseParse * parse,
3071 GstFormat fmt, gint64 duration, gint interval)
3073 g_return_if_fail (parse != NULL);
3075 if (parse->priv->upstream_has_duration) {
3076 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3080 if (duration != parse->priv->duration) {
3083 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
3084 gst_element_post_message (GST_ELEMENT (parse), m);
3086 /* TODO: what about duration tag? */
3088 parse->priv->duration = duration;
3089 parse->priv->duration_fmt = fmt;
3090 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3091 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3092 if (interval != 0) {
3093 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3097 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3098 parse->priv->update_interval = interval;
3104 * gst_base_parse_set_average_bitrate:
3105 * @parse: #GstBaseParse.
3106 * @bitrate: average bitrate in bits/second
3108 * Optionally sets the average bitrate detected in media (if non-zero),
3109 * e.g. based on metadata, as it will be posted to the application.
3111 * By default, announced average bitrate is estimated. The average bitrate
3112 * is used to estimate the total duration of the stream and to estimate
3113 * a seek position, if there's no index and the format is syncable
3114 * (see gst_base_parse_set_syncable()).
3119 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3121 parse->priv->bitrate = bitrate;
3122 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3126 * gst_base_parse_set_min_frame_size:
3127 * @parse: #GstBaseParse.
3128 * @min_size: Minimum size of the data that this base class should give to
3131 * Subclass can use this function to tell the base class that it needs to
3132 * give at least #min_size buffers.
3137 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3139 g_return_if_fail (parse != NULL);
3141 parse->priv->min_frame_size = min_size;
3142 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3146 * gst_base_parse_set_frame_rate:
3147 * @parse: the #GstBaseParse to set
3148 * @fps_num: frames per second (numerator).
3149 * @fps_den: frames per second (denominator).
3150 * @lead_in: frames needed before a segment for subsequent decode
3151 * @lead_out: frames needed after a segment
3153 * If frames per second is configured, parser can take care of buffer duration
3154 * and timestamping. When performing segment clipping, or seeking to a specific
3155 * location, a corresponding decoder might need an initial @lead_in and a
3156 * following @lead_out number of frames to ensure the desired segment is
3157 * entirely filled upon decoding.
3162 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3163 guint fps_den, guint lead_in, guint lead_out)
3165 g_return_if_fail (parse != NULL);
3167 parse->priv->fps_num = fps_num;
3168 parse->priv->fps_den = fps_den;
3169 if (!fps_num || !fps_den) {
3170 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3172 fps_num = fps_den = 0;
3173 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3174 parse->priv->lead_in = parse->priv->lead_out = 0;
3175 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3177 parse->priv->frame_duration =
3178 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3179 parse->priv->lead_in = lead_in;
3180 parse->priv->lead_out = lead_out;
3181 parse->priv->lead_in_ts =
3182 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3183 parse->priv->lead_out_ts =
3184 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3185 /* aim for about 1.5s to estimate duration */
3186 if (parse->priv->update_interval < 0) {
3187 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3188 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3189 parse->priv->update_interval);
3192 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3193 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3194 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3195 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3196 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3197 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3201 * gst_base_parse_set_has_timing_info:
3202 * @parse: a #GstBaseParse
3203 * @has_timing: whether frames carry timing information
3205 * Set if frames carry timing information which the subclass can (generally)
3206 * parse and provide. In particular, intrinsic (rather than estimated) time
3207 * can be obtained following a seek.
3212 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3214 parse->priv->has_timing_info = has_timing;
3215 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3219 * gst_base_parse_set_syncable:
3220 * @parse: a #GstBaseParse
3221 * @syncable: set if frame starts can be identified
3223 * Set if frame starts can be identified. This is set by default and
3224 * determines whether seeking based on bitrate averages
3225 * is possible for a format/stream.
3230 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3232 parse->priv->syncable = syncable;
3233 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3237 * gst_base_parse_set_passthrough:
3238 * @parse: a #GstBaseParse
3239 * @passthrough: %TRUE if parser should run in passthrough mode
3241 * Set if the nature of the format or configuration does not allow (much)
3242 * parsing, and the parser should operate in passthrough mode (which only
3243 * applies when operating in push mode). That is, incoming buffers are
3244 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3245 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3246 * so subclass can perform as much or as little is appropriate for
3247 * passthrough semantics in @pre_push_frame.
3252 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3254 parse->priv->passthrough = passthrough;
3255 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3259 * gst_base_parse_set_latency:
3260 * @parse: a #GstBaseParse
3261 * @min_latency: minimum parse latency
3262 * @max_latency: maximum parse latency
3264 * Sets the minimum and maximum (which may likely be equal) latency introduced
3265 * by the parsing process. If there is such a latency, which depends on the
3266 * particular parsing of the format, it typically corresponds to 1 frame duration.
3271 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3272 GstClockTime max_latency)
3274 GST_OBJECT_LOCK (parse);
3275 parse->priv->min_latency = min_latency;
3276 parse->priv->max_latency = max_latency;
3277 GST_OBJECT_UNLOCK (parse);
3278 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3279 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3280 GST_TIME_ARGS (max_latency));
3284 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3285 GstClockTime * duration)
3287 gboolean res = FALSE;
3289 g_return_val_if_fail (duration != NULL, FALSE);
3291 *duration = GST_CLOCK_TIME_NONE;
3292 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3293 GST_LOG_OBJECT (parse, "using provided duration");
3294 *duration = parse->priv->duration;
3296 } else if (parse->priv->duration != -1) {
3297 GST_LOG_OBJECT (parse, "converting provided duration");
3298 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3299 parse->priv->duration, format, (gint64 *) duration);
3300 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3301 GST_LOG_OBJECT (parse, "using estimated duration");
3302 *duration = parse->priv->estimated_duration;
3306 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3307 GST_TIME_ARGS (*duration));
3312 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
3314 GstBaseParse *parse;
3315 gboolean res = FALSE;
3317 parse = GST_BASE_PARSE (parent);
3319 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3321 switch (GST_QUERY_TYPE (query)) {
3322 case GST_QUERY_POSITION:
3327 GST_DEBUG_OBJECT (parse, "position query");
3328 gst_query_parse_position (query, &format, NULL);
3330 /* try upstream first */
3331 res = gst_pad_query_default (pad, parent, query);
3333 /* Fall back on interpreting segment */
3334 GST_OBJECT_LOCK (parse);
3335 if (format == GST_FORMAT_BYTES) {
3336 dest_value = parse->priv->offset;
3338 } else if (format == parse->segment.format &&
3339 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
3340 dest_value = gst_segment_to_stream_time (&parse->segment,
3341 parse->segment.format, parse->segment.position);
3344 GST_OBJECT_UNLOCK (parse);
3346 /* no precise result, upstream no idea either, then best estimate */
3347 /* priv->offset is updated in both PUSH/PULL modes */
3348 res = gst_base_parse_convert (parse,
3349 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3352 gst_query_set_position (query, format, dest_value);
3356 case GST_QUERY_DURATION:
3359 GstClockTime duration;
3361 GST_DEBUG_OBJECT (parse, "duration query");
3362 gst_query_parse_duration (query, &format, NULL);
3364 /* consult upstream */
3365 res = gst_pad_query_default (pad, parent, query);
3367 /* otherwise best estimate from us */
3369 res = gst_base_parse_get_duration (parse, format, &duration);
3371 gst_query_set_duration (query, format, duration);
3375 case GST_QUERY_SEEKING:
3378 GstClockTime duration = GST_CLOCK_TIME_NONE;
3379 gboolean seekable = FALSE;
3381 GST_DEBUG_OBJECT (parse, "seeking query");
3382 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3384 /* consult upstream */
3385 res = gst_pad_query_default (pad, parent, query);
3387 /* we may be able to help if in TIME */
3388 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3389 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3390 /* already OK if upstream takes care */
3391 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3393 if (!(res && seekable)) {
3394 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3395 || duration == -1) {
3396 /* seekable if we still have a chance to get duration later on */
3398 parse->priv->upstream_seekable && parse->priv->update_interval;
3400 seekable = parse->priv->upstream_seekable;
3401 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3404 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3410 case GST_QUERY_FORMATS:
3411 gst_query_set_formatsv (query, 3, fmtlist);
3414 case GST_QUERY_CONVERT:
3416 GstFormat src_format, dest_format;
3417 gint64 src_value, dest_value;
3419 gst_query_parse_convert (query, &src_format, &src_value,
3420 &dest_format, &dest_value);
3422 res = gst_base_parse_convert (parse, src_format, src_value,
3423 dest_format, &dest_value);
3425 gst_query_set_convert (query, src_format, src_value,
3426 dest_format, dest_value);
3430 case GST_QUERY_LATENCY:
3432 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3434 GstClockTime min_latency, max_latency;
3436 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3437 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3438 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3439 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3441 GST_OBJECT_LOCK (parse);
3442 /* add our latency */
3443 if (min_latency != -1)
3444 min_latency += parse->priv->min_latency;
3445 if (max_latency != -1)
3446 max_latency += parse->priv->max_latency;
3447 GST_OBJECT_UNLOCK (parse);
3449 gst_query_set_latency (query, live, min_latency, max_latency);
3454 res = gst_pad_query_default (pad, parent, query);
3460 /* scans for a cluster start from @pos,
3461 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3462 static GstFlowReturn
3463 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3464 GstClockTime * time, GstClockTime * duration)
3466 GstBaseParseClass *klass;
3468 gboolean orig_drain, orig_discont;
3469 GstFlowReturn ret = GST_FLOW_OK;
3470 GstBuffer *buf = NULL;
3471 GstBaseParseFrame frame;
3473 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3474 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3475 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3477 klass = GST_BASE_PARSE_GET_CLASS (parse);
3479 *time = GST_CLOCK_TIME_NONE;
3480 *duration = GST_CLOCK_TIME_NONE;
3483 orig_offset = parse->priv->offset;
3484 orig_discont = parse->priv->discont;
3485 orig_drain = parse->priv->drain;
3487 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3488 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3490 gst_base_parse_frame_init (&frame);
3492 /* jump elsewhere and locate next frame */
3493 parse->priv->offset = *pos;
3494 ret = gst_base_parse_scan_frame (parse, klass, &frame, FALSE);
3495 if (ret != GST_FLOW_OK)
3499 GST_LOG_OBJECT (parse,
3500 "peek parsing frame at offset %" G_GUINT64_FORMAT
3501 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
3502 GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET (buf),
3503 gst_buffer_get_size (buf));
3505 /* get offset first, subclass parsing might dump other stuff in there */
3506 *pos = GST_BUFFER_OFFSET (buf);
3507 ret = klass->parse_frame (parse, &frame);
3510 /* but it should provide proper time */
3511 *time = GST_BUFFER_TIMESTAMP (buf);
3512 *duration = GST_BUFFER_DURATION (buf);
3514 gst_base_parse_frame_free (&frame);
3516 GST_LOG_OBJECT (parse,
3517 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3518 GST_TIME_ARGS (*time), *pos);
3522 parse->priv->offset = orig_offset;
3523 parse->priv->discont = orig_discont;
3524 parse->priv->drain = orig_drain;
3529 /* bisect and scan through file for frame starting before @time,
3530 * returns OK and @time/@offset if found, NONE and/or error otherwise
3531 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3532 static GstFlowReturn
3533 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3536 GstFlowReturn ret = GST_FLOW_OK;
3537 gint64 lpos, hpos, newpos;
3538 GstClockTime time, ltime, htime, newtime, dur;
3539 gboolean cont = TRUE;
3540 const GstClockTime tolerance = TARGET_DIFFERENCE;
3541 const guint chunk = 4 * 1024;
3543 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3544 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3546 /* TODO also make keyframe aware if useful some day */
3561 /* do not know at first */
3563 *_time = GST_CLOCK_TIME_NONE;
3565 /* need initial positions; start and end */
3566 lpos = parse->priv->first_frame_offset;
3567 ltime = parse->priv->first_frame_ts;
3568 htime = parse->priv->duration;
3569 hpos = parse->priv->upstream_size;
3571 /* check preconditions are satisfied;
3572 * start and end are needed, except for special case where we scan for
3573 * last frame to determine duration */
3574 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
3575 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3576 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3580 /* shortcut cases */
3583 } else if (time < ltime + tolerance) {
3587 } else if (time >= htime) {
3593 while (htime > ltime && cont) {
3594 GST_LOG_OBJECT (parse,
3595 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3596 GST_TIME_ARGS (ltime));
3597 GST_LOG_OBJECT (parse,
3598 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3599 GST_TIME_ARGS (htime));
3600 if (G_UNLIKELY (time == G_MAXINT64)) {
3602 } else if (G_LIKELY (hpos > lpos)) {
3604 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3607 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3609 /* we check this case once, but not forever, so break loop */
3614 newpos = CLAMP (newpos, lpos, hpos);
3615 GST_LOG_OBJECT (parse,
3616 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3617 GST_TIME_ARGS (time), newpos);
3619 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3620 if (ret == GST_FLOW_EOS) {
3621 /* heuristic HACK */
3622 hpos = MAX (lpos, hpos - chunk);
3624 } else if (ret != GST_FLOW_OK) {
3628 if (newtime == -1 || newpos == -1) {
3629 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3633 if (G_UNLIKELY (time == G_MAXINT64)) {
3636 if (GST_CLOCK_TIME_IS_VALID (dur))
3639 } else if (newtime > time) {
3641 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3643 } else if (newtime + tolerance > time) {
3644 /* close enough undershoot */
3648 } else if (newtime < ltime) {
3649 /* so a position beyond lpos resulted in earlier time than ltime ... */
3650 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3653 /* undershoot too far */
3654 newpos += newpos == lpos ? chunk : 0;
3655 lpos = CLAMP (newpos, lpos, hpos);
3661 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3662 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3667 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3668 gboolean before, GstClockTime * _ts)
3670 gint64 bytes = 0, ts = 0;
3671 GstIndexEntry *entry = NULL;
3673 if (time == GST_CLOCK_TIME_NONE) {
3679 g_static_mutex_lock (&parse->priv->index_lock);
3680 if (parse->priv->index) {
3681 /* Let's check if we have an index entry for that time */
3682 entry = gst_index_get_assoc_entry (parse->priv->index,
3683 parse->priv->index_id,
3684 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3685 GST_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3689 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3690 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3692 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3693 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3694 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3696 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3697 GST_TIME_ARGS (time));
3700 ts = GST_CLOCK_TIME_NONE;
3703 g_static_mutex_unlock (&parse->priv->index_lock);
3712 /* returns TRUE if seek succeeded */
3714 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3719 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3720 gboolean flush, update, res = TRUE, accurate;
3721 gint64 cur, stop, seekpos, seekstop;
3722 GstSegment seeksegment = { 0, };
3723 GstClockTime start_ts;
3725 gst_event_parse_seek (event, &rate, &format, &flags,
3726 &cur_type, &cur, &stop_type, &stop);
3728 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3729 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3730 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3731 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3733 /* no negative rates in push mode */
3734 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
3737 if (cur_type != GST_SEEK_TYPE_SET ||
3738 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3741 /* For any format other than TIME, see if upstream handles
3742 * it directly or fail. For TIME, try upstream, but do it ourselves if
3743 * it fails upstream */
3744 if (format != GST_FORMAT_TIME) {
3745 /* default action delegates to upstream */
3749 gst_event_ref (event);
3750 if ((res = gst_pad_push_event (parse->sinkpad, event))) {
3755 /* get flush flag */
3756 flush = flags & GST_SEEK_FLAG_FLUSH;
3758 /* copy segment, we need this because we still need the old
3759 * segment when we close the current segment. */
3760 gst_segment_copy_into (&parse->segment, &seeksegment);
3762 GST_DEBUG_OBJECT (parse, "configuring seek");
3763 gst_segment_do_seek (&seeksegment, rate, format, flags,
3764 cur_type, cur, stop_type, stop, &update);
3766 /* accurate seeking implies seek tables are used to obtain position,
3767 * and the requested segment is maintained exactly, not adjusted any way */
3768 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3770 /* maybe we can be accurate for (almost) free */
3771 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
3772 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
3773 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3777 GstClockTime startpos = seeksegment.position;
3779 /* accurate requested, so ... seek a bit before target */
3780 if (startpos < parse->priv->lead_in_ts)
3783 startpos -= parse->priv->lead_in_ts;
3784 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3785 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3788 start_ts = seeksegment.position;
3789 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.position,
3790 GST_FORMAT_BYTES, &seekpos))
3791 goto convert_failed;
3792 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3793 GST_FORMAT_BYTES, &seekstop))
3794 goto convert_failed;
3797 GST_DEBUG_OBJECT (parse,
3798 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3800 GST_DEBUG_OBJECT (parse,
3801 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3802 seeksegment.stop, seekstop);
3804 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
3807 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3810 if (parse->srcpad) {
3811 GST_DEBUG_OBJECT (parse, "sending flush start");
3812 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3813 /* unlock upstream pull_range */
3814 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3817 gst_pad_pause_task (parse->sinkpad);
3820 /* we should now be able to grab the streaming thread because we stopped it
3821 * with the above flush/pause code */
3822 GST_PAD_STREAM_LOCK (parse->sinkpad);
3824 /* save current position */
3825 last_stop = parse->segment.position;
3826 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3829 /* now commit to new position */
3831 /* prepare for streaming again */
3833 GST_DEBUG_OBJECT (parse, "sending flush stop");
3834 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop (TRUE));
3835 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop (TRUE));
3836 gst_base_parse_clear_queues (parse);
3838 /* keep track of our position */
3839 seeksegment.base = gst_segment_to_running_time (&seeksegment,
3840 seeksegment.format, parse->segment.position);
3843 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3845 /* store the newsegment event so it can be sent from the streaming thread. */
3846 if (parse->priv->pending_segment)
3847 gst_event_unref (parse->priv->pending_segment);
3849 /* This will be sent later in _loop() */
3850 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
3852 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3853 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3854 ", pos = %" GST_TIME_FORMAT, format,
3855 GST_TIME_ARGS (parse->segment.start),
3856 GST_TIME_ARGS (parse->segment.stop),
3857 GST_TIME_ARGS (parse->segment.start));
3859 /* one last chance in pull mode to stay accurate;
3860 * maybe scan and subclass can find where to go */
3863 GstClockTime ts = seeksegment.position;
3865 gst_base_parse_locate_time (parse, &ts, &scanpos);
3869 /* running collected index now consists of several intervals,
3870 * so optimized check no longer possible */
3871 parse->priv->index_last_valid = FALSE;
3872 parse->priv->index_last_offset = 0;
3873 parse->priv->index_last_ts = 0;
3877 /* mark discont if we are going to stream from another position. */
3878 if (seekpos != parse->priv->offset) {
3879 GST_DEBUG_OBJECT (parse,
3880 "mark DISCONT, we did a seek to another position");
3881 parse->priv->offset = seekpos;
3882 parse->priv->last_offset = seekpos;
3883 parse->priv->seen_keyframe = FALSE;
3884 parse->priv->discont = TRUE;
3885 parse->priv->next_ts = start_ts;
3886 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3887 parse->priv->sync_offset = seekpos;
3888 parse->priv->exact_position = accurate;
3891 /* Start streaming thread if paused */
3892 gst_pad_start_task (parse->sinkpad,
3893 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3895 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3900 GstEvent *new_event;
3901 GstBaseParseSeek *seek;
3902 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
3904 /* The only thing we need to do in PUSH-mode is to send the
3905 seek event (in bytes) to upstream. Segment / flush handling happens
3906 in corresponding src event handlers */
3907 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3908 if (seekstop >= 0 && seekstop <= seekpos)
3910 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
3911 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3913 /* store segment info so its precise details can be reconstructed when
3914 * receiving newsegment;
3915 * this matters for all details when accurate seeking,
3916 * is most useful to preserve NONE stop time otherwise */
3917 seek = g_new0 (GstBaseParseSeek, 1);
3918 seek->segment = seeksegment;
3919 seek->accurate = accurate;
3920 seek->offset = seekpos;
3921 seek->start_ts = start_ts;
3922 GST_OBJECT_LOCK (parse);
3923 /* less optimal, but preserves order */
3924 parse->priv->pending_seeks =
3925 g_slist_append (parse->priv->pending_seeks, seek);
3926 GST_OBJECT_UNLOCK (parse);
3928 res = gst_pad_push_event (parse->sinkpad, new_event);
3931 GST_OBJECT_LOCK (parse);
3932 parse->priv->pending_seeks =
3933 g_slist_remove (parse->priv->pending_seeks, seek);
3934 GST_OBJECT_UNLOCK (parse);
3940 /* handled event is ours to free */
3942 gst_event_unref (event);
3948 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
3954 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
3960 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
3966 /* Checks if bitrates are available from upstream tags so that we don't
3967 * override them later
3970 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
3972 GstTagList *taglist = NULL;
3975 gst_event_parse_tag (event, &taglist);
3977 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
3978 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
3979 parse->priv->post_min_bitrate = FALSE;
3981 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
3982 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
3983 parse->priv->post_avg_bitrate = FALSE;
3985 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
3986 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
3987 parse->priv->post_max_bitrate = FALSE;
3992 gst_base_parse_set_index (GstElement * element, GstIndex * index)
3994 GstBaseParse *parse = GST_BASE_PARSE (element);
3996 g_static_mutex_lock (&parse->priv->index_lock);
3997 if (parse->priv->index)
3998 gst_object_unref (parse->priv->index);
4000 parse->priv->index = gst_object_ref (index);
4001 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4002 &parse->priv->index_id);
4003 parse->priv->own_index = FALSE;
4005 parse->priv->index = NULL;
4007 g_static_mutex_unlock (&parse->priv->index_lock);
4011 gst_base_parse_get_index (GstElement * element)
4013 GstBaseParse *parse = GST_BASE_PARSE (element);
4014 GstIndex *result = NULL;
4016 g_static_mutex_lock (&parse->priv->index_lock);
4017 if (parse->priv->index)
4018 result = gst_object_ref (parse->priv->index);
4019 g_static_mutex_unlock (&parse->priv->index_lock);
4024 static GstStateChangeReturn
4025 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4027 GstBaseParse *parse;
4028 GstStateChangeReturn result;
4030 parse = GST_BASE_PARSE (element);
4032 switch (transition) {
4033 case GST_STATE_CHANGE_READY_TO_PAUSED:
4034 /* If this is our own index destroy it as the
4035 * old entries might be wrong for the new stream */
4036 g_static_mutex_lock (&parse->priv->index_lock);
4037 if (parse->priv->own_index) {
4038 gst_object_unref (parse->priv->index);
4039 parse->priv->index = NULL;
4040 parse->priv->own_index = FALSE;
4043 /* If no index was created, generate one */
4044 if (G_UNLIKELY (!parse->priv->index)) {
4045 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4047 parse->priv->index = gst_index_factory_make ("memindex");
4048 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4049 &parse->priv->index_id);
4050 parse->priv->own_index = TRUE;
4052 g_static_mutex_unlock (&parse->priv->index_lock);
4058 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4060 switch (transition) {
4061 case GST_STATE_CHANGE_PAUSED_TO_READY:
4062 gst_base_parse_reset (parse);