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_push (GstPad * pad,
380 GstObject * parent, gboolean active);
381 static gboolean gst_base_parse_sink_activate_pull (GstPad * pad,
382 GstObject * parent, gboolean active);
383 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
385 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
387 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
389 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
392 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
394 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
397 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
399 static void gst_base_parse_loop (GstPad * pad);
401 static gboolean gst_base_parse_check_frame (GstBaseParse * parse,
402 GstBaseParseFrame * frame, guint * framesize, gint * skipsize);
403 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
404 GstBaseParseFrame * frame);
406 static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse,
409 static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse,
412 static void gst_base_parse_drain (GstBaseParse * parse);
414 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
415 gboolean post_min, gboolean post_avg, gboolean post_max);
417 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
418 GstClockTime time, gboolean before, GstClockTime * _ts);
419 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
420 GstClockTime * _time, gint64 * _offset);
422 static GstFlowReturn gst_base_parse_process_fragment (GstBaseParse * parse,
425 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
428 gst_base_parse_clear_queues (GstBaseParse * parse)
430 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
431 g_slist_free (parse->priv->buffers_queued);
432 parse->priv->buffers_queued = NULL;
433 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
435 g_slist_free (parse->priv->buffers_pending);
436 parse->priv->buffers_pending = NULL;
437 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
438 g_slist_free (parse->priv->buffers_send);
439 parse->priv->buffers_send = NULL;
441 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
442 g_list_free (parse->priv->detect_buffers);
443 parse->priv->detect_buffers = NULL;
444 parse->priv->detect_buffers_size = 0;
448 gst_base_parse_finalize (GObject * object)
450 GstBaseParse *parse = GST_BASE_PARSE (object);
453 g_object_unref (parse->priv->adapter);
455 if (parse->priv->pending_segment) {
456 p_ev = &parse->priv->pending_segment;
457 gst_event_replace (p_ev, NULL);
459 if (parse->priv->close_segment) {
460 p_ev = &parse->priv->close_segment;
461 gst_event_replace (p_ev, NULL);
464 if (parse->priv->cache) {
465 gst_buffer_unref (parse->priv->cache);
466 parse->priv->cache = NULL;
469 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
471 g_list_free (parse->priv->pending_events);
472 parse->priv->pending_events = NULL;
474 g_queue_foreach (&parse->priv->queued_frames,
475 (GFunc) gst_base_parse_frame_free, NULL);
476 g_queue_clear (&parse->priv->queued_frames);
478 if (parse->priv->index) {
479 gst_object_unref (parse->priv->index);
480 parse->priv->index = NULL;
483 g_static_mutex_free (&parse->priv->index_lock);
485 gst_base_parse_clear_queues (parse);
487 G_OBJECT_CLASS (parent_class)->finalize (object);
491 gst_base_parse_class_init (GstBaseParseClass * klass)
493 GObjectClass *gobject_class;
494 GstElementClass *gstelement_class;
496 gobject_class = G_OBJECT_CLASS (klass);
497 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
498 parent_class = g_type_class_peek_parent (klass);
499 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
501 gstelement_class = (GstElementClass *) klass;
502 gstelement_class->change_state =
503 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
504 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
505 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
507 /* Default handlers */
508 klass->check_valid_frame = gst_base_parse_check_frame;
509 klass->parse_frame = gst_base_parse_parse_frame;
510 klass->src_event = gst_base_parse_src_eventfunc;
511 klass->convert = gst_base_parse_convert_default;
513 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
514 "baseparse element");
518 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
520 GstPadTemplate *pad_template;
522 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
524 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
527 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
528 g_return_if_fail (pad_template != NULL);
529 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
530 gst_pad_set_event_function (parse->sinkpad,
531 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
532 gst_pad_set_query_function (parse->sinkpad,
533 GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
534 gst_pad_set_chain_function (parse->sinkpad,
535 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
536 gst_pad_set_activate_function (parse->sinkpad,
537 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
538 gst_pad_set_activatepush_function (parse->sinkpad,
539 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_push));
540 gst_pad_set_activatepull_function (parse->sinkpad,
541 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_pull));
542 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
544 GST_DEBUG_OBJECT (parse, "sinkpad created");
547 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
548 g_return_if_fail (pad_template != NULL);
549 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
550 gst_pad_set_event_function (parse->srcpad,
551 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
552 gst_pad_set_query_function (parse->srcpad,
553 GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
554 gst_pad_use_fixed_caps (parse->srcpad);
555 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
556 GST_DEBUG_OBJECT (parse, "src created");
558 g_queue_init (&parse->priv->queued_frames);
560 parse->priv->adapter = gst_adapter_new ();
562 parse->priv->pad_mode = GST_PAD_MODE_NONE;
564 g_static_mutex_init (&parse->priv->index_lock);
567 gst_base_parse_reset (parse);
568 GST_DEBUG_OBJECT (parse, "init ok");
571 static GstBaseParseFrame *
572 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
574 GstBaseParseFrame *copy;
576 copy = g_slice_dup (GstBaseParseFrame, frame);
577 copy->buffer = gst_buffer_ref (frame->buffer);
578 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
580 GST_TRACE ("copied frame %p -> %p", frame, copy);
586 gst_base_parse_frame_free (GstBaseParseFrame * frame)
588 GST_TRACE ("freeing frame %p", frame);
591 gst_buffer_unref (frame->buffer);
592 frame->buffer = NULL;
595 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
596 g_slice_free (GstBaseParseFrame, frame);
598 memset (frame, 0, sizeof (*frame));
603 gst_base_parse_frame_get_type (void)
605 static volatile gsize frame_type = 0;
607 if (g_once_init_enter (&frame_type)) {
610 _type = g_boxed_type_register_static ("GstBaseParseFrame",
611 (GBoxedCopyFunc) gst_base_parse_frame_copy,
612 (GBoxedFreeFunc) gst_base_parse_frame_free);
613 g_once_init_leave (&frame_type, _type);
615 return (GType) frame_type;
619 * gst_base_parse_frame_init:
620 * @frame: #GstBaseParseFrame.
622 * Sets a #GstBaseParseFrame to initial state. Currently this means
623 * all public fields are zero-ed and a private flag is set to make
624 * sure gst_base_parse_frame_free() only frees the contents but not
625 * the actual frame. Use this function to initialise a #GstBaseParseFrame
626 * allocated on the stack.
631 gst_base_parse_frame_init (GstBaseParseFrame * frame)
633 memset (frame, 0, sizeof (GstBaseParseFrame));
634 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
635 GST_TRACE ("inited frame %p", frame);
639 * gst_base_parse_frame_new:
640 * @buffer: (transfer none): a #GstBuffer
642 * @overhead: number of bytes in this frame which should be counted as
643 * metadata overhead, ie. not used to calculate the average bitrate.
644 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
646 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
647 * elements written in C should usually allocate the frame on the stack and
648 * then use gst_base_parse_frame_init() to initialise it.
650 * Returns: a newly-allocated #GstBaseParseFrame. Free with
651 * gst_base_parse_frame_free() when no longer needed, unless you gave
652 * away ownership to gst_base_parse_push_frame().
657 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
660 GstBaseParseFrame *frame;
662 frame = g_slice_new0 (GstBaseParseFrame);
663 frame->buffer = gst_buffer_ref (buffer);
665 GST_TRACE ("created frame %p", frame);
670 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
673 gst_buffer_replace (&frame->buffer, buf);
677 /* set flags one by one for clarity */
678 if (G_UNLIKELY (parse->priv->drain))
679 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
681 /* losing sync is pretty much a discont (and vice versa), no ? */
682 if (G_UNLIKELY (parse->priv->discont))
683 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
687 gst_base_parse_reset (GstBaseParse * parse)
689 GST_OBJECT_LOCK (parse);
690 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
691 parse->priv->duration = -1;
692 parse->priv->min_frame_size = 1;
693 parse->priv->discont = TRUE;
694 parse->priv->flushing = FALSE;
695 parse->priv->offset = 0;
696 parse->priv->sync_offset = 0;
697 parse->priv->update_interval = -1;
698 parse->priv->fps_num = parse->priv->fps_den = 0;
699 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
700 parse->priv->lead_in = parse->priv->lead_out = 0;
701 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
702 parse->priv->bitrate = 0;
703 parse->priv->framecount = 0;
704 parse->priv->bytecount = 0;
705 parse->priv->acc_duration = 0;
706 parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE;
707 parse->priv->first_frame_offset = -1;
708 parse->priv->estimated_duration = -1;
709 parse->priv->estimated_drift = 0;
710 parse->priv->next_ts = 0;
711 parse->priv->syncable = TRUE;
712 parse->priv->passthrough = FALSE;
713 parse->priv->has_timing_info = FALSE;
714 parse->priv->post_min_bitrate = TRUE;
715 parse->priv->post_avg_bitrate = TRUE;
716 parse->priv->post_max_bitrate = TRUE;
717 parse->priv->min_bitrate = G_MAXUINT;
718 parse->priv->max_bitrate = 0;
719 parse->priv->avg_bitrate = 0;
720 parse->priv->posted_avg_bitrate = 0;
722 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
723 parse->priv->index_last_offset = -1;
724 parse->priv->index_last_valid = TRUE;
725 parse->priv->upstream_seekable = FALSE;
726 parse->priv->upstream_size = 0;
727 parse->priv->upstream_has_duration = FALSE;
728 parse->priv->idx_interval = 0;
729 parse->priv->exact_position = TRUE;
730 parse->priv->seen_keyframe = FALSE;
732 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
733 parse->priv->last_offset = 0;
735 if (parse->priv->pending_segment) {
736 gst_event_unref (parse->priv->pending_segment);
737 parse->priv->pending_segment = NULL;
740 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
742 g_list_free (parse->priv->pending_events);
743 parse->priv->pending_events = NULL;
745 if (parse->priv->cache) {
746 gst_buffer_unref (parse->priv->cache);
747 parse->priv->cache = NULL;
750 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
751 g_slist_free (parse->priv->pending_seeks);
752 parse->priv->pending_seeks = NULL;
754 /* we know it is not alloc'ed, but maybe other stuff to free, some day ... */
755 parse->priv->frame._private_flags |=
756 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
757 gst_base_parse_frame_free (&parse->priv->frame);
759 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
760 g_list_free (parse->priv->detect_buffers);
761 parse->priv->detect_buffers = NULL;
762 parse->priv->detect_buffers_size = 0;
763 GST_OBJECT_UNLOCK (parse);
766 /* gst_base_parse_check_frame:
767 * @parse: #GstBaseParse.
768 * @buffer: GstBuffer.
769 * @framesize: This will be set to tell the found frame size in bytes.
770 * @skipsize: Output parameter that tells how much data needs to be skipped
771 * in order to find the following frame header.
773 * Default callback for check_valid_frame.
775 * Returns: Always TRUE.
778 gst_base_parse_check_frame (GstBaseParse * parse,
779 GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
781 *framesize = gst_buffer_get_size (frame->buffer);
787 /* gst_base_parse_parse_frame:
788 * @parse: #GstBaseParse.
789 * @buffer: #GstBuffer.
791 * Default callback for parse_frame.
794 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
796 GstBuffer *buffer = frame->buffer;
798 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
799 GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) {
800 GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts;
802 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
803 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
804 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
809 /* gst_base_parse_convert:
810 * @parse: #GstBaseParse.
811 * @src_format: #GstFormat describing the source format.
812 * @src_value: Source value to be converted.
813 * @dest_format: #GstFormat defining the converted format.
814 * @dest_value: Pointer where the conversion result will be put.
816 * Converts using configured "convert" vmethod in #GstBaseParse class.
818 * Returns: TRUE if conversion was successful.
821 gst_base_parse_convert (GstBaseParse * parse,
822 GstFormat src_format,
823 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
825 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
828 g_return_val_if_fail (dest_value != NULL, FALSE);
833 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
835 #ifndef GST_DISABLE_GST_DEBUG
838 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
839 GST_LOG_OBJECT (parse,
840 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
841 GST_TIME_ARGS (src_value), *dest_value);
842 } else if (dest_format == GST_FORMAT_TIME &&
843 src_format == GST_FORMAT_BYTES) {
844 GST_LOG_OBJECT (parse,
845 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
846 src_value, GST_TIME_ARGS (*dest_value));
848 GST_LOG_OBJECT (parse,
849 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
850 GST_STR_NULL (gst_format_get_name (src_format)),
851 GST_STR_NULL (gst_format_get_name (dest_format)),
852 src_value, *dest_value);
855 GST_DEBUG_OBJECT (parse, "conversion failed");
863 /* gst_base_parse_sink_event:
864 * @pad: #GstPad that received the event.
865 * @event: #GstEvent to be handled.
867 * Handler for sink pad events.
869 * Returns: TRUE if the event was handled.
872 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
875 GstBaseParseClass *bclass;
876 gboolean handled = FALSE;
879 parse = GST_BASE_PARSE (parent);
880 bclass = GST_BASE_PARSE_GET_CLASS (parse);
882 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
883 GST_EVENT_TYPE_NAME (event));
885 /* Cache all events except EOS, SEGMENT and FLUSH_STOP if we have a
887 if (parse->priv->pending_segment && GST_EVENT_TYPE (event) != GST_EVENT_EOS
888 && GST_EVENT_TYPE (event) != GST_EVENT_SEGMENT
889 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
890 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP) {
892 if (GST_EVENT_TYPE (event) == GST_EVENT_TAG)
893 /* See if any bitrate tags were posted */
894 gst_base_parse_handle_tag (parse, event);
896 parse->priv->pending_events =
897 g_list_append (parse->priv->pending_events, event);
901 if (GST_EVENT_TYPE (event) == GST_EVENT_EOS &&
902 parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
903 /* We've not posted bitrate tags yet - do so now */
904 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
907 handled = bclass->event (parse, event);
910 handled = gst_base_parse_sink_eventfunc (parse, event);
913 ret = gst_pad_event_default (pad, parent, event);
916 GST_DEBUG_OBJECT (parse, "event handled");
922 /* gst_base_parse_sink_eventfunc:
923 * @parse: #GstBaseParse.
924 * @event: #GstEvent to be handled.
926 * Element-level event handler function.
928 * The event will be unreffed only if it has been handled and this
929 * function returns %TRUE
931 * Returns: %TRUE if the event was handled and not need forwarding.
934 gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event)
936 gboolean handled = FALSE;
939 switch (GST_EVENT_TYPE (event)) {
943 GstBaseParseClass *klass;
945 klass = GST_BASE_PARSE_GET_CLASS (parse);
947 gst_event_parse_caps (event, &caps);
948 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
950 if (klass->set_sink_caps)
951 klass->set_sink_caps (parse, caps);
953 /* will send our own caps downstream */
954 gst_event_unref (event);
958 case GST_EVENT_SEGMENT:
960 const GstSegment *in_segment;
961 GstSegment out_segment;
962 gint64 offset = 0, next_ts;
965 gdouble rate, applied_rate;
967 gint64 start, stop, pos, next_ts;
971 gst_event_parse_segment (event, &in_segment);
972 gst_segment_init (&out_segment, GST_FORMAT_TIME);
974 GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
976 if (in_segment->format == GST_FORMAT_BYTES) {
977 GstBaseParseSeek *seek = NULL;
980 /* stop time is allowed to be open-ended, but not start & pos */
981 offset = in_segment->time;
983 GST_OBJECT_LOCK (parse);
984 for (node = parse->priv->pending_seeks; node; node = node->next) {
985 GstBaseParseSeek *tmp = node->data;
987 if (tmp->offset == offset) {
992 parse->priv->pending_seeks =
993 g_slist_remove (parse->priv->pending_seeks, seek);
994 GST_OBJECT_UNLOCK (parse);
997 GST_DEBUG_OBJECT (parse,
998 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
999 seek->accurate ? " accurate" : "", &seek->segment);
1001 out_segment.start = seek->segment.start;
1002 out_segment.stop = seek->segment.stop;
1003 out_segment.time = seek->segment.start;
1005 next_ts = seek->start_ts;
1006 parse->priv->exact_position = seek->accurate;
1009 /* best attempt convert */
1010 /* as these are only estimates, stop is kept open-ended to avoid
1011 * premature cutting */
1012 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
1013 GST_FORMAT_TIME, (gint64 *) & next_ts);
1015 out_segment.start = next_ts;
1016 out_segment.stop = GST_CLOCK_TIME_NONE;
1017 out_segment.time = next_ts;
1019 parse->priv->exact_position = (in_segment->start == 0);
1022 gst_event_unref (event);
1024 event = gst_event_new_segment (&out_segment);
1026 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1027 GST_SEGMENT_FORMAT, in_segment);
1029 } else if (in_segment->format != GST_FORMAT_TIME) {
1030 /* Unknown incoming segment format. Output a default open-ended
1032 gst_event_unref (event);
1034 out_segment.start = 0;
1035 out_segment.stop = GST_CLOCK_TIME_NONE;;
1036 out_segment.time = 0;;
1038 event = gst_event_new_segment (&out_segment);
1042 /* not considered BYTE seekable if it is talking to us in TIME,
1043 * whatever else it might claim */
1044 parse->priv->upstream_seekable = FALSE;
1045 next_ts = in_segment->start;
1048 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1051 gst_segment_set_newsegment (&parse->segment, update, rate,
1052 applied_rate, format, start, stop, start);
1055 /* save the segment for later, right before we push a new buffer so that
1056 * the caps are fixed and the next linked element can receive
1058 eventp = &parse->priv->pending_segment;
1059 gst_event_replace (eventp, event);
1060 gst_event_unref (event);
1063 /* but finish the current segment */
1064 GST_DEBUG_OBJECT (parse, "draining current segment");
1065 if (in_segment->rate > 0.0)
1066 gst_base_parse_drain (parse);
1068 gst_base_parse_process_fragment (parse, FALSE);
1069 gst_adapter_clear (parse->priv->adapter);
1071 parse->priv->offset = offset;
1072 parse->priv->sync_offset = offset;
1073 parse->priv->next_ts = next_ts;
1074 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1075 parse->priv->discont = TRUE;
1076 parse->priv->seen_keyframe = FALSE;
1080 case GST_EVENT_FLUSH_START:
1081 parse->priv->flushing = TRUE;
1082 handled = gst_pad_push_event (parse->srcpad, gst_event_ref (event));
1084 gst_event_unref (event);
1085 /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
1086 GST_PAD_STREAM_LOCK (parse->srcpad);
1087 GST_PAD_STREAM_UNLOCK (parse->srcpad);
1091 case GST_EVENT_FLUSH_STOP:
1092 gst_adapter_clear (parse->priv->adapter);
1093 gst_base_parse_clear_queues (parse);
1094 parse->priv->flushing = FALSE;
1095 parse->priv->discont = TRUE;
1096 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1097 parse->priv->frame._private_flags |=
1098 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
1099 gst_base_parse_frame_free (&parse->priv->frame);
1103 if (parse->segment.rate > 0.0)
1104 gst_base_parse_drain (parse);
1106 gst_base_parse_process_fragment (parse, FALSE);
1108 /* If we STILL have zero frames processed, fire an error */
1109 if (parse->priv->framecount == 0) {
1110 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1111 ("No valid frames found before end of stream"), (NULL));
1113 /* newsegment before eos */
1114 if (parse->priv->pending_segment) {
1115 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
1116 parse->priv->pending_segment = NULL;
1128 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1130 GstBaseParse *parse;
1131 GstBaseParseClass *bclass;
1134 parse = GST_BASE_PARSE (parent);
1135 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1137 switch (GST_QUERY_TYPE (query)) {
1138 case GST_QUERY_CAPS:
1140 if (bclass->get_sink_caps) {
1141 GstCaps *caps, *filter;
1143 gst_query_parse_caps (query, &filter);
1144 caps = bclass->get_sink_caps (parse, filter);
1145 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1147 gst_query_set_caps_result (query, caps);
1148 gst_caps_unref (caps);
1152 res = gst_pad_peer_query (parse->srcpad, query);
1157 res = gst_pad_query_default (pad, parent, query);
1166 /* gst_base_parse_src_event:
1167 * @pad: #GstPad that received the event.
1168 * @event: #GstEvent that was received.
1170 * Handler for source pad events.
1172 * Returns: TRUE if the event was handled.
1175 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1177 GstBaseParse *parse;
1178 GstBaseParseClass *bclass;
1179 gboolean handled = FALSE;
1180 gboolean ret = TRUE;
1182 parse = GST_BASE_PARSE (parent);
1183 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1185 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1186 GST_EVENT_TYPE_NAME (event));
1188 if (bclass->src_event)
1189 handled = bclass->src_event (parse, event);
1192 ret = gst_pad_event_default (pad, parent, event);
1198 gst_base_parse_is_seekable (GstBaseParse * parse)
1200 /* FIXME: could do more here, e.g. check index or just send data from 0
1201 * in pull mode and let decoder/sink clip */
1202 return parse->priv->syncable;
1205 /* gst_base_parse_src_eventfunc:
1206 * @parse: #GstBaseParse.
1207 * @event: #GstEvent that was received.
1209 * Default srcpad event handler.
1211 * Returns: TRUE if the event was handled and can be dropped.
1214 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1216 gboolean handled = FALSE;
1218 switch (GST_EVENT_TYPE (event)) {
1219 case GST_EVENT_SEEK:
1221 if (gst_base_parse_is_seekable (parse)) {
1222 handled = gst_base_parse_handle_seek (parse, event);
1234 * gst_base_parse_convert_default:
1235 * @parse: #GstBaseParse.
1236 * @src_format: #GstFormat describing the source format.
1237 * @src_value: Source value to be converted.
1238 * @dest_format: #GstFormat defining the converted format.
1239 * @dest_value: Pointer where the conversion result will be put.
1241 * Default implementation of "convert" vmethod in #GstBaseParse class.
1243 * Returns: TRUE if conversion was successful.
1248 gst_base_parse_convert_default (GstBaseParse * parse,
1249 GstFormat src_format,
1250 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1252 gboolean ret = FALSE;
1253 guint64 bytes, duration;
1255 if (G_UNLIKELY (src_format == dest_format)) {
1256 *dest_value = src_value;
1260 if (G_UNLIKELY (src_value == -1)) {
1265 if (G_UNLIKELY (src_value == 0)) {
1270 /* need at least some frames */
1271 if (!parse->priv->framecount)
1274 duration = parse->priv->acc_duration / GST_MSECOND;
1275 bytes = parse->priv->bytecount;
1277 if (G_UNLIKELY (!duration || !bytes))
1280 if (src_format == GST_FORMAT_BYTES) {
1281 if (dest_format == GST_FORMAT_TIME) {
1282 /* BYTES -> TIME conversion */
1283 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1284 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1285 *dest_value *= GST_MSECOND;
1286 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1287 *dest_value / GST_MSECOND);
1290 } else if (src_format == GST_FORMAT_TIME) {
1291 if (dest_format == GST_FORMAT_BYTES) {
1292 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1293 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1295 GST_DEBUG_OBJECT (parse,
1296 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1297 src_value / GST_MSECOND, *dest_value);
1300 } else if (src_format == GST_FORMAT_DEFAULT) {
1301 /* DEFAULT == frame-based */
1302 if (dest_format == GST_FORMAT_TIME) {
1303 if (parse->priv->fps_den) {
1304 *dest_value = gst_util_uint64_scale (src_value,
1305 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1308 } else if (dest_format == GST_FORMAT_BYTES) {
1316 gst_base_parse_update_duration (GstBaseParse * baseparse)
1319 GstBaseParse *parse;
1321 parse = GST_BASE_PARSE (baseparse);
1323 peer = gst_pad_get_peer (parse->sinkpad);
1325 gboolean qres = FALSE;
1326 gint64 ptot, dest_value;
1328 qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot);
1329 gst_object_unref (GST_OBJECT (peer));
1331 if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1332 GST_FORMAT_TIME, &dest_value)) {
1334 /* inform if duration changed, but try to avoid spamming */
1335 parse->priv->estimated_drift +=
1336 dest_value - parse->priv->estimated_duration;
1337 if (parse->priv->estimated_drift > GST_SECOND ||
1338 parse->priv->estimated_drift < -GST_SECOND) {
1339 gst_element_post_message (GST_ELEMENT (parse),
1340 gst_message_new_duration (GST_OBJECT (parse),
1341 GST_FORMAT_TIME, dest_value));
1342 parse->priv->estimated_drift = 0;
1344 parse->priv->estimated_duration = dest_value;
1345 GST_LOG_OBJECT (parse,
1346 "updated estimated duration to %" GST_TIME_FORMAT,
1347 GST_TIME_ARGS (dest_value));
1354 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1355 gboolean post_avg, gboolean post_max)
1357 GstTagList *taglist = NULL;
1359 if (post_min && parse->priv->post_min_bitrate) {
1360 taglist = gst_tag_list_new_empty ();
1362 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1363 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1366 if (post_avg && parse->priv->post_avg_bitrate) {
1367 if (taglist == NULL)
1368 taglist = gst_tag_list_new_empty ();
1370 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1371 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1372 parse->priv->avg_bitrate, NULL);
1375 if (post_max && parse->priv->post_max_bitrate) {
1376 if (taglist == NULL)
1377 taglist = gst_tag_list_new_empty ();
1379 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1380 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1383 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1384 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1385 parse->priv->max_bitrate);
1387 if (taglist != NULL) {
1388 gst_pad_push_event (parse->srcpad, gst_event_new_tag (taglist));
1392 /* gst_base_parse_update_bitrates:
1393 * @parse: #GstBaseParse.
1394 * @buffer: Current frame as a #GstBuffer
1396 * Keeps track of the minimum and maximum bitrates, and also maintains a
1397 * running average bitrate of the stream so far.
1400 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1402 /* Only update the tag on a 10 kbps delta */
1403 static const gint update_threshold = 10000;
1405 guint64 data_len, frame_dur;
1406 gint overhead, frame_bitrate, old_avg_bitrate;
1407 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1408 GstBuffer *buffer = frame->buffer;
1410 overhead = frame->overhead;
1414 data_len = gst_buffer_get_size (buffer) - overhead;
1415 parse->priv->data_bytecount += data_len;
1417 /* duration should be valid by now,
1418 * either set by subclass or maybe based on fps settings */
1419 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1420 /* Calculate duration of a frame from buffer properties */
1421 frame_dur = GST_BUFFER_DURATION (buffer);
1422 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1423 parse->priv->acc_duration;
1426 /* No way to figure out frame duration (is this even possible?) */
1430 /* override if subclass provided bitrate, e.g. metadata based */
1431 if (parse->priv->bitrate) {
1432 parse->priv->avg_bitrate = parse->priv->bitrate;
1433 /* spread this (confirmed) info ASAP */
1434 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1435 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1439 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1443 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1444 parse->priv->avg_bitrate);
1446 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1448 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1449 /* always post all at threshold time */
1450 update_min = update_max = update_avg = TRUE;
1453 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1454 if (frame_bitrate < parse->priv->min_bitrate) {
1455 parse->priv->min_bitrate = frame_bitrate;
1459 if (frame_bitrate > parse->priv->max_bitrate) {
1460 parse->priv->max_bitrate = frame_bitrate;
1464 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1465 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1466 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1471 if ((update_min || update_avg || update_max))
1472 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1474 /* If average bitrate changes that much and no valid (time) duration provided,
1475 * then post a new duration message so applications can update their cached
1477 if (update_avg && !(parse->priv->duration_fmt == GST_FORMAT_TIME &&
1478 GST_CLOCK_TIME_IS_VALID (parse->priv->duration)))
1479 gst_element_post_message (GST_ELEMENT (parse),
1480 gst_message_new_duration (GST_OBJECT (parse), GST_FORMAT_TIME, -1));
1487 * gst_base_parse_add_index_entry:
1488 * @parse: #GstBaseParse.
1489 * @offset: offset of entry
1490 * @ts: timestamp associated with offset
1491 * @key: whether entry refers to keyframe
1492 * @force: add entry disregarding sanity checks
1494 * Adds an entry to the index associating @offset to @ts. It is recommended
1495 * to only add keyframe entries. @force allows to bypass checks, such as
1496 * whether the stream is (upstream) seekable, another entry is already "close"
1497 * to the new entry, etc.
1499 * Returns: #gboolean indicating whether entry was added
1504 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1505 GstClockTime ts, gboolean key, gboolean force)
1507 gboolean ret = FALSE;
1508 GstIndexAssociation associations[2];
1510 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1511 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1513 if (G_LIKELY (!force)) {
1515 if (!parse->priv->upstream_seekable) {
1516 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1520 /* FIXME need better helper data structure that handles these issues
1521 * related to ongoing collecting of index entries */
1522 if (parse->priv->index_last_offset >= (gint64) offset) {
1523 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1524 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1528 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1529 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1530 parse->priv->idx_interval) {
1531 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1532 GST_TIME_ARGS (parse->priv->index_last_ts));
1536 /* if last is not really the last one */
1537 if (!parse->priv->index_last_valid) {
1538 GstClockTime prev_ts;
1540 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1541 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1542 GST_DEBUG_OBJECT (parse,
1543 "entry too close to existing entry %" GST_TIME_FORMAT,
1544 GST_TIME_ARGS (prev_ts));
1545 parse->priv->index_last_offset = offset;
1546 parse->priv->index_last_ts = ts;
1552 associations[0].format = GST_FORMAT_TIME;
1553 associations[0].value = ts;
1554 associations[1].format = GST_FORMAT_BYTES;
1555 associations[1].value = offset;
1557 /* index might change on-the-fly, although that would be nutty app ... */
1558 g_static_mutex_lock (&parse->priv->index_lock);
1559 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1560 (key) ? GST_ASSOCIATION_FLAG_KEY_UNIT : GST_ASSOCIATION_FLAG_DELTA_UNIT,
1561 2, (const GstIndexAssociation *) &associations);
1562 g_static_mutex_unlock (&parse->priv->index_lock);
1565 parse->priv->index_last_offset = offset;
1566 parse->priv->index_last_ts = ts;
1575 /* check for seekable upstream, above and beyond a mere query */
1577 gst_base_parse_check_seekability (GstBaseParse * parse)
1580 gboolean seekable = FALSE;
1581 gint64 start = -1, stop = -1;
1582 guint idx_interval = 0;
1584 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1585 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1586 GST_DEBUG_OBJECT (parse, "seeking query failed");
1590 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1592 /* try harder to query upstream size if we didn't get it the first time */
1593 if (seekable && stop == -1) {
1594 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1595 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1598 /* if upstream doesn't know the size, it's likely that it's not seekable in
1599 * practice even if it technically may be seekable */
1600 if (seekable && (start != 0 || stop <= start)) {
1601 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1605 /* let's not put every single frame into our index */
1607 if (stop < 10 * 1024 * 1024)
1609 else if (stop < 100 * 1024 * 1024)
1612 idx_interval = 1000;
1616 gst_query_unref (query);
1618 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1619 G_GUINT64_FORMAT ")", seekable, start, stop);
1620 parse->priv->upstream_seekable = seekable;
1621 parse->priv->upstream_size = seekable ? stop : 0;
1623 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1624 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1627 /* some misc checks on upstream */
1629 gst_base_parse_check_upstream (GstBaseParse * parse)
1633 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
1634 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1635 /* upstream has one, accept it also, and no further updates */
1636 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1637 parse->priv->upstream_has_duration = TRUE;
1640 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1641 parse->priv->upstream_has_duration);
1644 /* checks src caps to determine if dealing with audio or video */
1645 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1647 gst_base_parse_check_media (GstBaseParse * parse)
1652 caps = gst_pad_get_current_caps (parse->srcpad);
1653 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1654 parse->priv->is_video =
1655 g_str_has_prefix (gst_structure_get_name (s), "video");
1657 /* historical default */
1658 parse->priv->is_video = FALSE;
1661 gst_caps_unref (caps);
1663 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1666 /* takes ownership of frame */
1668 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1670 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1671 /* frame allocated on the heap, we can just take ownership */
1672 g_queue_push_tail (&parse->priv->queued_frames, frame);
1673 GST_TRACE ("queued frame %p", frame);
1675 GstBaseParseFrame *copy;
1677 /* probably allocated on the stack, must make a proper copy */
1678 copy = gst_base_parse_frame_copy (frame);
1679 g_queue_push_tail (&parse->priv->queued_frames, copy);
1680 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1681 gst_base_parse_frame_free (frame);
1685 /* gst_base_parse_handle_and_push_buffer:
1686 * @parse: #GstBaseParse.
1687 * @klass: #GstBaseParseClass.
1688 * @frame: (transfer full): a #GstBaseParseFrame
1690 * Parses the frame from given buffer and pushes it forward. Also performs
1691 * timestamp handling and checks the segment limits.
1693 * This is called with srcpad STREAM_LOCK held.
1695 * Returns: #GstFlowReturn
1697 static GstFlowReturn
1698 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1699 GstBaseParseClass * klass, GstBaseParseFrame * frame)
1705 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1707 buffer = frame->buffer;
1709 if (parse->priv->discont) {
1710 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1711 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1712 parse->priv->discont = FALSE;
1715 /* some one-time start-up */
1716 if (G_UNLIKELY (!parse->priv->framecount)) {
1717 gst_base_parse_check_seekability (parse);
1718 gst_base_parse_check_upstream (parse);
1721 GST_LOG_OBJECT (parse,
1722 "parsing frame at offset %" G_GUINT64_FORMAT
1723 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
1724 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1725 gst_buffer_get_size (buffer));
1727 /* use default handler to provide initial (upstream) metadata */
1728 gst_base_parse_parse_frame (parse, frame);
1730 /* store offset as it might get overwritten */
1731 offset = GST_BUFFER_OFFSET (buffer);
1732 ret = klass->parse_frame (parse, frame);
1734 buffer = frame->buffer;
1735 /* subclass must play nice */
1736 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1738 /* check if subclass/format can provide ts.
1739 * If so, that allows and enables extra seek and duration determining options */
1740 if (G_UNLIKELY (parse->priv->first_frame_offset < 0 && ret == GST_FLOW_OK)) {
1741 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1742 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1743 parse->priv->first_frame_offset = offset;
1744 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1745 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1746 " for first frame at offset %" G_GINT64_FORMAT,
1747 GST_TIME_ARGS (parse->priv->first_frame_ts),
1748 parse->priv->first_frame_offset);
1749 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1751 GstClockTime last_ts = G_MAXINT64;
1753 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1754 gst_base_parse_locate_time (parse, &last_ts, &off);
1755 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1756 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1759 /* disable further checks */
1760 parse->priv->first_frame_offset = 0;
1764 /* again use default handler to add missing metadata;
1765 * we may have new information on frame properties */
1766 gst_base_parse_parse_frame (parse, frame);
1767 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1768 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1769 parse->priv->next_ts =
1770 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1772 /* we lost track, do not produce bogus time next time around
1773 * (probably means parser subclass has given up on parsing as well) */
1774 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1775 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1778 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1779 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1780 gst_base_parse_add_index_entry (parse, offset,
1781 GST_BUFFER_TIMESTAMP (buffer),
1782 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1784 /* First buffers are dropped, this means that the subclass needs more
1785 * frames to decide on the format and queues them internally */
1786 /* convert internal flow to OK and mark discont for the next buffer. */
1787 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1788 gst_base_parse_frame_free (frame);
1790 } else if (ret == GST_BASE_PARSE_FLOW_QUEUED) {
1791 gst_base_parse_queue_frame (parse, frame);
1793 } else if (ret != GST_FLOW_OK) {
1797 /* All OK, push queued frames if there are any */
1798 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1799 GstBaseParseFrame *queued_frame;
1801 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1802 gst_base_parse_push_frame (parse, queued_frame);
1806 return gst_base_parse_push_frame (parse, frame);
1810 * gst_base_parse_push_frame:
1811 * @parse: #GstBaseParse.
1812 * @frame: (transfer full): a #GstBaseParseFrame
1814 * Pushes the frame downstream, sends any pending events and
1815 * does some timestamp and segment handling. Takes ownership
1816 * of @frame and will clear it (if it was initialised with
1817 * gst_base_parse_frame_init()) or free it.
1819 * This must be called with sinkpad STREAM_LOCK held.
1821 * Returns: #GstFlowReturn
1826 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1828 GstFlowReturn ret = GST_FLOW_OK;
1829 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1830 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1831 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1835 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1836 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1838 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1840 buffer = frame->buffer;
1842 GST_LOG_OBJECT (parse,
1843 "processing buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT
1844 ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer),
1845 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1846 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1849 size = gst_buffer_get_size (buffer);
1850 parse->priv->bytecount += size;
1851 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1852 parse->priv->framecount++;
1853 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1854 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1857 /* 0 means disabled */
1858 if (parse->priv->update_interval < 0)
1859 parse->priv->update_interval = 50;
1860 else if (parse->priv->update_interval > 0 &&
1861 (parse->priv->framecount % parse->priv->update_interval) == 0)
1862 gst_base_parse_update_duration (parse);
1864 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1865 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1866 if (last_start != GST_CLOCK_TIME_NONE
1867 && GST_BUFFER_DURATION_IS_VALID (buffer))
1868 last_stop = last_start + GST_BUFFER_DURATION (buffer);
1870 /* should have caps by now */
1871 g_return_val_if_fail (gst_pad_has_current_caps (parse->srcpad),
1874 /* segment adjustment magic; only if we are running the whole show */
1875 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
1876 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
1877 parse->priv->upstream_seekable)) {
1878 /* segment times are typically estimates,
1879 * actual frame data might lead subclass to different timestamps,
1880 * so override segment start from what is supplied there */
1881 if (G_UNLIKELY (parse->priv->pending_segment && !parse->priv->exact_position
1882 && GST_CLOCK_TIME_IS_VALID (last_start))) {
1883 gst_event_unref (parse->priv->pending_segment);
1884 parse->segment.start =
1885 MIN ((guint64) last_start, (guint64) parse->segment.stop);
1887 GST_DEBUG_OBJECT (parse,
1888 "adjusting pending segment start to %" GST_TIME_FORMAT,
1889 GST_TIME_ARGS (parse->segment.start));
1891 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
1893 /* handle gaps, e.g. non-zero start-time, in as much not handled by above */
1894 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
1895 GST_CLOCK_TIME_IS_VALID (last_start)) {
1896 GstClockTimeDiff diff;
1898 /* only send newsegments with increasing start times,
1899 * otherwise if these go back and forth downstream (sinks) increase
1900 * accumulated time and running_time */
1901 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
1902 if (G_UNLIKELY (diff > 2 * GST_SECOND
1903 && last_start > parse->segment.start
1904 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
1905 || last_start < parse->segment.stop))) {
1907 GST_DEBUG_OBJECT (parse,
1908 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
1909 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
1910 "Sending updated NEWSEGMENT events", diff,
1911 GST_TIME_ARGS (parse->segment.position),
1912 GST_TIME_ARGS (last_start));
1914 if (G_UNLIKELY (parse->priv->pending_segment)) {
1915 gst_event_unref (parse->priv->pending_segment);
1916 parse->segment.start = last_start;
1917 parse->segment.time = last_start;
1918 parse->priv->pending_segment =
1919 gst_event_new_segment (&parse->segment);
1921 /* skip gap FIXME */
1922 gst_pad_push_event (parse->srcpad,
1923 gst_event_new_segment (&parse->segment));
1925 parse->segment.position = last_start;
1930 /* and should then also be linked downstream, so safe to send some events */
1931 if (G_UNLIKELY (parse->priv->close_segment)) {
1932 /* only set up by loop */
1933 GST_DEBUG_OBJECT (parse, "loop sending close segment");
1934 gst_pad_push_event (parse->srcpad, parse->priv->close_segment);
1935 parse->priv->close_segment = NULL;
1937 if (G_UNLIKELY (parse->priv->pending_segment)) {
1938 GstEvent *pending_segment;
1940 pending_segment = parse->priv->pending_segment;
1941 parse->priv->pending_segment = NULL;
1943 GST_DEBUG_OBJECT (parse, "%s push pending segment",
1944 parse->priv->pad_mode == GST_PAD_MODE_PULL ? "loop" : "chain");
1945 gst_pad_push_event (parse->srcpad, pending_segment);
1947 /* have caps; check identity */
1948 gst_base_parse_check_media (parse);
1951 /* update bitrates and optionally post corresponding tags
1952 * (following newsegment) */
1953 gst_base_parse_update_bitrates (parse, frame);
1955 if (G_UNLIKELY (parse->priv->pending_events)) {
1958 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
1959 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
1961 g_list_free (parse->priv->pending_events);
1962 parse->priv->pending_events = NULL;
1965 if (klass->pre_push_frame) {
1966 ret = klass->pre_push_frame (parse, frame);
1968 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
1971 /* take final ownership of frame buffer */
1972 buffer = frame->buffer;
1973 frame->buffer = NULL;
1975 /* subclass must play nice */
1976 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1978 parse->priv->seen_keyframe |= parse->priv->is_video &&
1979 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
1981 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
1982 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1983 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
1984 GST_BUFFER_TIMESTAMP (buffer) >
1985 parse->segment.stop + parse->priv->lead_out_ts) {
1986 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
1988 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1989 GST_BUFFER_DURATION_IS_VALID (buffer) &&
1990 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
1991 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
1992 parse->priv->lead_in_ts < parse->segment.start) {
1993 if (parse->priv->seen_keyframe) {
1994 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
1997 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
1998 ret = GST_BASE_PARSE_FLOW_DROPPED;
2005 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2006 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2007 gst_buffer_unref (buffer);
2009 } else if (ret == GST_FLOW_OK) {
2010 if (parse->segment.rate > 0.0) {
2011 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2013 ret = gst_pad_push (parse->srcpad, buffer);
2014 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2016 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2018 parse->priv->buffers_queued =
2019 g_slist_prepend (parse->priv->buffers_queued, buffer);
2023 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2024 size, gst_flow_get_name (ret));
2025 gst_buffer_unref (buffer);
2026 /* if we are not sufficiently in control, let upstream decide on EOS */
2027 if (ret == GST_FLOW_EOS &&
2028 (parse->priv->passthrough ||
2029 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2030 !parse->priv->upstream_seekable)))
2034 /* Update current running segment position */
2035 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
2036 parse->segment.position < last_stop)
2037 parse->segment.position = last_stop;
2039 gst_base_parse_frame_free (frame);
2045 /* gst_base_parse_drain:
2047 * Drains the adapter until it is empty. It decreases the min_frame_size to
2048 * match the current adapter size and calls chain method until the adapter
2049 * is emptied or chain returns with error.
2052 gst_base_parse_drain (GstBaseParse * parse)
2056 GST_DEBUG_OBJECT (parse, "draining");
2057 parse->priv->drain = TRUE;
2060 avail = gst_adapter_available (parse->priv->adapter);
2064 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2065 NULL) != GST_FLOW_OK) {
2069 /* nothing changed, maybe due to truncated frame; break infinite loop */
2070 if (avail == gst_adapter_available (parse->priv->adapter)) {
2071 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2072 gst_adapter_clear (parse->priv->adapter);
2076 parse->priv->drain = FALSE;
2079 /* gst_base_parse_send_buffers
2081 * Sends buffers collected in send_buffers downstream, and ensures that list
2082 * is empty at the end (errors or not).
2084 static GstFlowReturn
2085 gst_base_parse_send_buffers (GstBaseParse * parse)
2087 GSList *send = NULL;
2089 GstFlowReturn ret = GST_FLOW_OK;
2091 send = parse->priv->buffers_send;
2095 buf = GST_BUFFER_CAST (send->data);
2096 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
2097 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2098 ", offset %" G_GINT64_FORMAT, buf,
2099 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
2100 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2102 /* iterate output queue an push downstream */
2103 ret = gst_pad_push (parse->srcpad, buf);
2104 send = g_slist_delete_link (send, send);
2106 /* clear any leftover if error */
2107 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2109 buf = GST_BUFFER_CAST (send->data);
2110 gst_buffer_unref (buf);
2111 send = g_slist_delete_link (send, send);
2116 parse->priv->buffers_send = send;
2121 /* gst_base_parse_process_fragment:
2123 * Processes a reverse playback (forward) fragment:
2124 * - append head of last fragment that was skipped to current fragment data
2125 * - drain the resulting current fragment data (i.e. repeated chain)
2126 * - add time/duration (if needed) to frames queued by chain
2127 * - push queued data
2129 static GstFlowReturn
2130 gst_base_parse_process_fragment (GstBaseParse * parse, gboolean push_only)
2133 GstFlowReturn ret = GST_FLOW_OK;
2134 gboolean seen_key = FALSE, seen_delta = FALSE;
2140 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2141 while (parse->priv->buffers_pending) {
2142 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2143 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2144 gst_buffer_get_size (buf));
2145 gst_adapter_push (parse->priv->adapter, buf);
2146 parse->priv->buffers_pending =
2147 g_slist_delete_link (parse->priv->buffers_pending,
2148 parse->priv->buffers_pending);
2151 /* invalidate so no fall-back timestamping is performed;
2152 * ok if taken from subclass or upstream */
2153 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2154 /* prevent it hanging around stop all the time */
2155 parse->segment.position = GST_CLOCK_TIME_NONE;
2157 parse->priv->discont = TRUE;
2159 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2160 /* initial skipped data is added to buffers_pending */
2161 gst_base_parse_drain (parse);
2164 if (parse->priv->buffers_send) {
2165 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2166 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2169 /* add metadata (if needed to queued buffers */
2170 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2171 GST_TIME_ARGS (parse->priv->last_ts));
2172 while (parse->priv->buffers_queued) {
2173 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2175 /* no touching if upstream or parsing provided time */
2176 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2177 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2178 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2179 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2180 GST_BUFFER_DURATION_IS_VALID (buf)) {
2181 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2182 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2184 parse->priv->last_ts = 0;
2185 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2186 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2187 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2189 /* no idea, very bad */
2190 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2193 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2195 /* reverse order for ascending sending */
2196 /* send downstream at keyframe not preceded by a keyframe
2197 * (e.g. that should identify start of collection of IDR nals) */
2198 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2200 ret = gst_base_parse_send_buffers (parse);
2201 /* if a problem, throw all to sending */
2202 if (ret != GST_FLOW_OK) {
2203 parse->priv->buffers_send =
2204 g_slist_reverse (parse->priv->buffers_queued);
2205 parse->priv->buffers_queued = NULL;
2214 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2216 parse->priv->buffers_send =
2217 g_slist_prepend (parse->priv->buffers_send, buf);
2218 parse->priv->buffers_queued =
2219 g_slist_delete_link (parse->priv->buffers_queued,
2220 parse->priv->buffers_queued);
2223 /* audio may have all marked as keyframe, so arrange to send here */
2225 ret = gst_base_parse_send_buffers (parse);
2227 /* any trailing unused no longer usable (ideally none) */
2228 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2229 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2230 gst_adapter_available (parse->priv->adapter));
2231 gst_adapter_clear (parse->priv->adapter);
2237 /* small helper that checks whether we have been trying to resync too long */
2238 static inline GstFlowReturn
2239 gst_base_parse_check_sync (GstBaseParse * parse)
2241 if (G_UNLIKELY (parse->priv->discont &&
2242 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2243 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2244 ("Failed to parse stream"), (NULL));
2245 return GST_FLOW_ERROR;
2251 static GstFlowReturn
2252 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
2254 GstBaseParseClass *bclass;
2255 GstBaseParse *parse;
2256 GstFlowReturn ret = GST_FLOW_OK;
2257 GstBuffer *outbuf = NULL;
2258 GstBuffer *tmpbuf = NULL;
2262 guint old_min_size = 0, min_size, av;
2263 GstClockTime timestamp;
2264 GstBaseParseFrame *frame;
2266 parse = GST_BASE_PARSE (parent);
2267 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2269 if (parse->priv->detecting) {
2270 GstBuffer *detect_buf;
2272 if (parse->priv->detect_buffers_size == 0) {
2273 detect_buf = gst_buffer_ref (buffer);
2278 detect_buf = gst_buffer_new ();
2280 for (l = parse->priv->detect_buffers; l; l = l->next) {
2281 gsize tmpsize = gst_buffer_get_size (l->data);
2283 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
2284 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
2288 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
2289 offset, gst_buffer_get_size (buffer));
2292 ret = bclass->detect (parse, detect_buf);
2293 gst_buffer_unref (detect_buf);
2295 if (ret == GST_FLOW_OK) {
2298 /* Detected something */
2299 parse->priv->detecting = FALSE;
2301 for (l = parse->priv->detect_buffers; l; l = l->next) {
2302 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2304 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2305 parent, GST_BUFFER_CAST (l->data));
2307 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2309 g_list_free (parse->priv->detect_buffers);
2310 parse->priv->detect_buffers = NULL;
2311 parse->priv->detect_buffers_size = 0;
2313 if (ret != GST_FLOW_OK) {
2317 /* Handle the current buffer */
2318 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2319 /* Still detecting, append buffer or error out if draining */
2321 if (parse->priv->drain) {
2322 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2323 return GST_FLOW_ERROR;
2324 } else if (parse->priv->flushing) {
2325 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2327 g_list_free (parse->priv->detect_buffers);
2328 parse->priv->detect_buffers = NULL;
2329 parse->priv->detect_buffers_size = 0;
2331 parse->priv->detect_buffers =
2332 g_list_append (parse->priv->detect_buffers, buffer);
2333 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
2337 /* Something went wrong, subclass responsible for error reporting */
2341 /* And now handle the current buffer if detection worked */
2344 frame = &parse->priv->frame;
2346 if (G_LIKELY (buffer)) {
2347 GST_LOG_OBJECT (parse,
2348 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT,
2349 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer));
2350 if (G_UNLIKELY (parse->priv->passthrough)) {
2351 gst_base_parse_frame_init (frame);
2352 frame->buffer = gst_buffer_make_writable (buffer);
2353 return gst_base_parse_push_frame (parse, frame);
2355 /* upstream feeding us in reverse playback;
2356 * gather each fragment, then process it in single run */
2357 if (parse->segment.rate < 0.0) {
2358 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2359 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2360 ret = gst_base_parse_process_fragment (parse, FALSE);
2362 gst_adapter_push (parse->priv->adapter, buffer);
2365 gst_adapter_push (parse->priv->adapter, buffer);
2368 if (G_UNLIKELY (buffer &&
2369 GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2370 frame->_private_flags |= GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
2371 gst_base_parse_frame_free (frame);
2374 /* Parse and push as many frames as possible */
2375 /* Stop either when adapter is empty or we are flushing */
2376 while (!parse->priv->flushing) {
2379 /* maintain frame state for a single frame parsing round across _chain calls,
2380 * so only init when needed */
2381 if (!frame->_private_flags)
2382 gst_base_parse_frame_init (frame);
2384 tmpbuf = gst_buffer_new ();
2387 /* Synchronization loop */
2389 /* note: if subclass indicates MAX fsize,
2390 * this will not likely be available anyway ... */
2391 min_size = MAX (parse->priv->min_frame_size, fsize);
2392 av = gst_adapter_available (parse->priv->adapter);
2394 /* loop safety check */
2395 if (G_UNLIKELY (old_min_size >= min_size))
2397 old_min_size = min_size;
2399 if (G_UNLIKELY (parse->priv->drain)) {
2401 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2402 if (G_UNLIKELY (!min_size)) {
2403 gst_buffer_unref (tmpbuf);
2408 /* Collect at least min_frame_size bytes */
2409 if (av < min_size) {
2410 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)",
2412 gst_buffer_unref (tmpbuf);
2416 /* always pass all available data */
2417 data = gst_adapter_map (parse->priv->adapter, av);
2418 gst_buffer_take_memory (tmpbuf, -1,
2419 gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY,
2420 (gpointer) data, NULL, av, 0, av));
2421 GST_BUFFER_OFFSET (tmpbuf) = parse->priv->offset;
2423 if (parse->priv->discont) {
2424 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2425 GST_BUFFER_FLAG_SET (tmpbuf, GST_BUFFER_FLAG_DISCONT);
2429 gst_base_parse_frame_update (parse, frame, tmpbuf);
2430 res = bclass->check_valid_frame (parse, frame, &fsize, &skip);
2431 gst_adapter_unmap (parse->priv->adapter);
2432 gst_buffer_replace (&frame->buffer, NULL);
2433 gst_buffer_remove_memory_range (tmpbuf, 0, -1);
2435 if (gst_adapter_available (parse->priv->adapter) < fsize) {
2436 GST_DEBUG_OBJECT (parse, "found valid frame but not enough data"
2437 " available (only %" G_GSIZE_FORMAT " bytes)",
2438 gst_adapter_available (parse->priv->adapter));
2439 gst_buffer_unref (tmpbuf);
2442 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2446 /* subclass didn't touch this value. By default we skip 1 byte */
2450 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2451 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2452 /* reverse playback, and no frames found yet, so we are skipping
2453 * the leading part of a fragment, which may form the tail of
2454 * fragment coming later, hopefully subclass skips efficiently ... */
2455 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2456 outbuf = gst_adapter_take_buffer (parse->priv->adapter, skip);
2457 outbuf = gst_buffer_make_writable (outbuf);
2458 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
2459 parse->priv->buffers_pending =
2460 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2463 gst_adapter_flush (parse->priv->adapter, skip);
2465 parse->priv->offset += skip;
2466 if (!parse->priv->discont)
2467 parse->priv->sync_offset = parse->priv->offset;
2468 parse->priv->discont = TRUE;
2469 /* something changed least; nullify loop check */
2472 /* skip == 0 should imply subclass set min_size to need more data;
2473 * we check this shortly */
2474 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2475 gst_buffer_unref (tmpbuf);
2479 gst_buffer_unref (tmpbuf);
2483 /* Subclass found the sync, but still wants to skip some data */
2484 GST_LOG_OBJECT (parse, "skipping %d bytes", skip);
2485 gst_adapter_flush (parse->priv->adapter, skip);
2486 parse->priv->offset += skip;
2489 /* Grab lock to prevent a race with FLUSH_START handler */
2490 GST_PAD_STREAM_LOCK (parse->srcpad);
2492 /* FLUSH_START event causes the "flushing" flag to be set. In this
2493 * case we can leave the frame pushing loop */
2494 if (parse->priv->flushing) {
2495 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2499 /* move along with upstream timestamp (if any),
2500 * but interpolate in between */
2501 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2502 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2503 (parse->priv->prev_ts != timestamp)) {
2504 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2507 /* FIXME: Would it be more efficient to make a subbuffer instead? */
2508 outbuf = gst_adapter_take_buffer (parse->priv->adapter, fsize);
2509 outbuf = gst_buffer_make_writable (outbuf);
2511 /* Subclass may want to know the data offset */
2512 GST_BUFFER_OFFSET (outbuf) = parse->priv->offset;
2513 parse->priv->offset += fsize;
2514 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2515 GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
2517 frame->buffer = outbuf;
2518 ret = gst_base_parse_handle_and_push_frame (parse, bclass, frame);
2519 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2521 if (ret != GST_FLOW_OK) {
2522 GST_LOG_OBJECT (parse, "push returned %d", ret);
2528 GST_LOG_OBJECT (parse, "chain leaving");
2534 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2535 ("min_size evolution %d -> %d; breaking to avoid looping",
2536 old_min_size, min_size));
2537 return GST_FLOW_ERROR;
2541 /* pull @size bytes at current offset,
2542 * i.e. at least try to and possibly return a shorter buffer if near the end */
2543 static GstFlowReturn
2544 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2545 GstBuffer ** buffer)
2547 GstFlowReturn ret = GST_FLOW_OK;
2549 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2551 /* Caching here actually makes much less difference than one would expect.
2552 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2553 if (parse->priv->cache) {
2554 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2555 gint cache_size = gst_buffer_get_size (parse->priv->cache);
2557 if (cache_offset <= parse->priv->offset &&
2558 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2559 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
2560 parse->priv->offset - cache_offset, size);
2561 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2564 /* not enough data in the cache, free cache and get a new one */
2565 gst_buffer_unref (parse->priv->cache);
2566 parse->priv->cache = NULL;
2569 /* refill the cache */
2571 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2572 64 * 1024), &parse->priv->cache);
2573 if (ret != GST_FLOW_OK) {
2574 parse->priv->cache = NULL;
2578 if (gst_buffer_get_size (parse->priv->cache) >= size) {
2580 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
2582 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2586 /* Not possible to get enough data, try a last time with
2587 * requesting exactly the size we need */
2588 gst_buffer_unref (parse->priv->cache);
2589 parse->priv->cache = NULL;
2591 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2592 &parse->priv->cache);
2594 if (ret != GST_FLOW_OK) {
2595 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2600 if (gst_buffer_get_size (parse->priv->cache) < size) {
2601 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2602 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
2603 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
2605 *buffer = parse->priv->cache;
2606 parse->priv->cache = NULL;
2612 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
2613 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2618 static GstFlowReturn
2619 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2622 GstClockTime ts = 0;
2626 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2627 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2628 parse->priv->last_offset);
2630 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2631 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2632 GST_TIME_ARGS (parse->segment.start));
2637 /* last fragment started at last_offset / last_ts;
2638 * seek back 10s capped at 1MB */
2639 if (parse->priv->last_ts >= 10 * GST_SECOND)
2640 ts = parse->priv->last_ts - 10 * GST_SECOND;
2641 /* if we are exact now, we will be more so going backwards */
2642 if (parse->priv->exact_position) {
2643 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2645 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2646 GST_FORMAT_BYTES, &offset)) {
2647 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2650 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2651 parse->priv->last_offset - 1024);
2652 offset = MAX (0, offset);
2654 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2656 parse->priv->offset = offset;
2658 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2660 if (ret != GST_FLOW_OK)
2663 /* offset will increase again as fragment is processed/parsed */
2664 parse->priv->last_offset = offset;
2666 gst_adapter_push (parse->priv->adapter, buffer);
2667 ret = gst_base_parse_process_fragment (parse, FALSE);
2668 if (ret != GST_FLOW_OK)
2671 /* force previous fragment */
2672 parse->priv->offset = -1;
2679 * pull and scan for next frame starting from current offset
2680 * ajusts sync, drain and offset going along */
2681 static GstFlowReturn
2682 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2683 GstBaseParseFrame * frame, gboolean full)
2685 GstBuffer *buffer, *outbuf;
2686 GstFlowReturn ret = GST_FLOW_OK;
2687 guint fsize = 1, min_size, old_min_size = 0;
2690 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2692 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2693 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2695 /* let's make this efficient for all subclass once and for all;
2696 * maybe it does not need this much, but in the latter case, we know we are
2697 * in pull mode here and might as well try to read and supply more anyway
2698 * (so does the buffer caching mechanism) */
2704 min_size = MAX (parse->priv->min_frame_size, fsize);
2705 /* loop safety check */
2706 if (G_UNLIKELY (old_min_size >= min_size))
2708 old_min_size = min_size;
2710 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2711 if (ret != GST_FLOW_OK)
2714 if (parse->priv->discont) {
2715 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2716 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
2719 /* if we got a short read, inform subclass we are draining leftover
2720 * and no more is to be expected */
2721 if (gst_buffer_get_size (buffer) < min_size)
2722 parse->priv->drain = TRUE;
2724 if (parse->priv->detecting) {
2725 ret = klass->detect (parse, buffer);
2726 if (ret == GST_FLOW_NOT_NEGOTIATED) {
2727 /* If draining we error out, otherwise request a buffer
2729 if (parse->priv->drain) {
2730 gst_buffer_unref (buffer);
2731 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
2732 return GST_FLOW_ERROR;
2735 gst_buffer_unref (buffer);
2738 } else if (ret != GST_FLOW_OK) {
2739 gst_buffer_unref (buffer);
2740 GST_ERROR_OBJECT (parse, "detect() returned %s",
2741 gst_flow_get_name (ret));
2745 /* Else handle this buffer normally */
2749 gst_base_parse_frame_update (parse, frame, buffer);
2750 res = klass->check_valid_frame (parse, frame, &fsize, &skip);
2751 gst_buffer_replace (&frame->buffer, NULL);
2753 parse->priv->drain = FALSE;
2754 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2757 parse->priv->drain = FALSE;
2761 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2762 if (full && parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2763 /* reverse playback, and no frames found yet, so we are skipping
2764 * the leading part of a fragment, which may form the tail of
2765 * fragment coming later, hopefully subclass skips efficiently ... */
2766 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, 0, skip);
2767 parse->priv->buffers_pending =
2768 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2771 parse->priv->offset += skip;
2772 if (!parse->priv->discont)
2773 parse->priv->sync_offset = parse->priv->offset;
2774 parse->priv->discont = TRUE;
2775 /* something changed at least; nullify loop check */
2776 if (fsize == G_MAXUINT)
2777 fsize = old_min_size + 64 * 1024;
2780 /* skip == 0 should imply subclass set min_size to need more data;
2781 * we check this shortly */
2782 GST_DEBUG_OBJECT (parse, "finding sync...");
2783 gst_buffer_unref (buffer);
2784 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2789 /* Does the subclass want to skip too? */
2791 parse->priv->offset += skip;
2795 if (fsize + skip <= gst_buffer_get_size (buffer)) {
2796 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, skip, fsize);
2797 GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer) + skip;
2798 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2799 gst_buffer_unref (buffer);
2801 gst_buffer_unref (buffer);
2802 ret = gst_base_parse_pull_range (parse, fsize, &outbuf);
2803 if (ret != GST_FLOW_OK)
2805 if (gst_buffer_get_size (outbuf) < fsize) {
2806 gst_buffer_unref (outbuf);
2811 parse->priv->offset += fsize;
2813 frame->buffer = outbuf;
2821 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2822 ("min_size evolution %d -> %d; breaking to avoid looping",
2823 old_min_size, min_size));
2824 return GST_FLOW_ERROR;
2828 /* Loop that is used in pull mode to retrieve data from upstream */
2830 gst_base_parse_loop (GstPad * pad)
2832 GstBaseParse *parse;
2833 GstBaseParseClass *klass;
2834 GstFlowReturn ret = GST_FLOW_OK;
2835 GstBaseParseFrame frame;
2837 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2838 klass = GST_BASE_PARSE_GET_CLASS (parse);
2840 /* reverse playback:
2841 * first fragment (closest to stop time) is handled normally below,
2842 * then we pull in fragments going backwards */
2843 if (parse->segment.rate < 0.0) {
2844 /* check if we jumped back to a previous fragment,
2845 * which is a post-first fragment */
2846 if (parse->priv->offset < 0) {
2847 ret = gst_base_parse_handle_previous_fragment (parse);
2852 gst_base_parse_frame_init (&frame);
2853 ret = gst_base_parse_scan_frame (parse, klass, &frame, TRUE);
2854 if (ret != GST_FLOW_OK)
2857 /* This always cleans up frame, even if error occurs */
2858 ret = gst_base_parse_handle_and_push_frame (parse, klass, &frame);
2860 /* eat expected eos signalling past segment in reverse playback */
2861 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
2862 parse->segment.position >= parse->segment.stop) {
2863 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2864 /* push what was accumulated during loop run */
2865 gst_base_parse_process_fragment (parse, TRUE);
2866 /* force previous fragment */
2867 parse->priv->offset = -1;
2872 if (ret == GST_FLOW_EOS)
2874 else if (ret != GST_FLOW_OK)
2877 gst_object_unref (parse);
2884 GST_DEBUG_OBJECT (parse, "eos");
2889 gboolean push_eos = FALSE;
2891 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2892 gst_flow_get_name (ret));
2893 gst_pad_pause_task (parse->sinkpad);
2895 if (ret == GST_FLOW_EOS) {
2896 /* handle end-of-stream/segment */
2897 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2900 if ((stop = parse->segment.stop) == -1)
2901 stop = parse->segment.duration;
2903 GST_DEBUG_OBJECT (parse, "sending segment_done");
2905 gst_element_post_message
2906 (GST_ELEMENT_CAST (parse),
2907 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2908 GST_FORMAT_TIME, stop));
2910 /* If we STILL have zero frames processed, fire an error */
2911 if (parse->priv->framecount == 0) {
2912 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2913 ("No valid frames found before end of stream"), (NULL));
2917 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
2918 /* for fatal errors we post an error message, wrong-state is
2919 * not fatal because it happens due to flushes and only means
2920 * that we should stop now. */
2921 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2922 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
2926 /* newsegment before eos */
2927 if (parse->priv->pending_segment) {
2928 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
2929 parse->priv->pending_segment = NULL;
2931 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
2933 gst_object_unref (parse);
2938 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
2940 GstBaseParse *parse;
2941 gboolean result = TRUE;
2945 parse = GST_BASE_PARSE (parent);
2947 GST_DEBUG_OBJECT (parse, "sink activate");
2949 query = gst_query_new_scheduling ();
2950 result = gst_pad_peer_query (sinkpad, query);
2952 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL);
2956 gst_query_unref (query);
2959 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
2960 result = gst_pad_activate_pull (sinkpad, TRUE);
2962 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
2963 result = gst_pad_activate_push (sinkpad, TRUE);
2966 GST_DEBUG_OBJECT (parse, "sink activate return %d", result);
2971 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
2973 GstBaseParseClass *klass;
2974 gboolean result = TRUE;
2976 GST_DEBUG_OBJECT (parse, "activate %d", active);
2978 klass = GST_BASE_PARSE_GET_CLASS (parse);
2981 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
2982 result = klass->start (parse);
2984 /* If the subclass implements ::detect we want to
2985 * call it for the first buffers now */
2986 parse->priv->detecting = (klass->detect != NULL);
2988 /* We must make sure streaming has finished before resetting things
2989 * and calling the ::stop vfunc */
2990 GST_PAD_STREAM_LOCK (parse->sinkpad);
2991 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
2993 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
2994 result = klass->stop (parse);
2996 parse->priv->pad_mode = GST_PAD_MODE_NONE;
2998 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
3003 gst_base_parse_sink_activate_push (GstPad * pad, GstObject * parent,
3006 gboolean result = TRUE;
3007 GstBaseParse *parse;
3009 parse = GST_BASE_PARSE (parent);
3011 GST_DEBUG_OBJECT (parse, "sink activate push %d", active);
3013 result = gst_base_parse_activate (parse, active);
3016 parse->priv->pad_mode = active ? GST_PAD_MODE_PUSH : GST_PAD_MODE_NONE;
3018 GST_DEBUG_OBJECT (parse, "sink activate push return: %d", result);
3024 gst_base_parse_sink_activate_pull (GstPad * sinkpad, GstObject * parent,
3027 gboolean result = FALSE;
3028 GstBaseParse *parse;
3030 parse = GST_BASE_PARSE (parent);
3032 GST_DEBUG_OBJECT (parse, "activate pull %d", active);
3034 result = gst_base_parse_activate (parse, active);
3038 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
3040 gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop,
3043 result &= gst_pad_stop_task (sinkpad);
3048 parse->priv->pad_mode = active ? GST_PAD_MODE_PULL : GST_PAD_MODE_NONE;
3050 GST_DEBUG_OBJECT (parse, "sink activate pull return: %d", result);
3057 * gst_base_parse_set_duration:
3058 * @parse: #GstBaseParse.
3060 * @duration: duration value.
3061 * @interval: how often to update the duration estimate based on bitrate, or 0.
3063 * Sets the duration of the currently playing media. Subclass can use this
3064 * when it is able to determine duration and/or notices a change in the media
3065 * duration. Alternatively, if @interval is non-zero (default), then stream
3066 * duration is determined based on estimated bitrate, and updated every @interval
3072 gst_base_parse_set_duration (GstBaseParse * parse,
3073 GstFormat fmt, gint64 duration, gint interval)
3075 g_return_if_fail (parse != NULL);
3077 if (parse->priv->upstream_has_duration) {
3078 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3082 if (duration != parse->priv->duration) {
3085 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
3086 gst_element_post_message (GST_ELEMENT (parse), m);
3088 /* TODO: what about duration tag? */
3090 parse->priv->duration = duration;
3091 parse->priv->duration_fmt = fmt;
3092 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3093 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3094 if (interval != 0) {
3095 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3099 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3100 parse->priv->update_interval = interval;
3106 * gst_base_parse_set_average_bitrate:
3107 * @parse: #GstBaseParse.
3108 * @bitrate: average bitrate in bits/second
3110 * Optionally sets the average bitrate detected in media (if non-zero),
3111 * e.g. based on metadata, as it will be posted to the application.
3113 * By default, announced average bitrate is estimated. The average bitrate
3114 * is used to estimate the total duration of the stream and to estimate
3115 * a seek position, if there's no index and the format is syncable
3116 * (see gst_base_parse_set_syncable()).
3121 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3123 parse->priv->bitrate = bitrate;
3124 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3128 * gst_base_parse_set_min_frame_size:
3129 * @parse: #GstBaseParse.
3130 * @min_size: Minimum size of the data that this base class should give to
3133 * Subclass can use this function to tell the base class that it needs to
3134 * give at least #min_size buffers.
3139 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3141 g_return_if_fail (parse != NULL);
3143 parse->priv->min_frame_size = min_size;
3144 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3148 * gst_base_parse_set_frame_rate:
3149 * @parse: the #GstBaseParse to set
3150 * @fps_num: frames per second (numerator).
3151 * @fps_den: frames per second (denominator).
3152 * @lead_in: frames needed before a segment for subsequent decode
3153 * @lead_out: frames needed after a segment
3155 * If frames per second is configured, parser can take care of buffer duration
3156 * and timestamping. When performing segment clipping, or seeking to a specific
3157 * location, a corresponding decoder might need an initial @lead_in and a
3158 * following @lead_out number of frames to ensure the desired segment is
3159 * entirely filled upon decoding.
3164 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3165 guint fps_den, guint lead_in, guint lead_out)
3167 g_return_if_fail (parse != NULL);
3169 parse->priv->fps_num = fps_num;
3170 parse->priv->fps_den = fps_den;
3171 if (!fps_num || !fps_den) {
3172 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3174 fps_num = fps_den = 0;
3175 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3176 parse->priv->lead_in = parse->priv->lead_out = 0;
3177 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3179 parse->priv->frame_duration =
3180 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3181 parse->priv->lead_in = lead_in;
3182 parse->priv->lead_out = lead_out;
3183 parse->priv->lead_in_ts =
3184 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3185 parse->priv->lead_out_ts =
3186 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3187 /* aim for about 1.5s to estimate duration */
3188 if (parse->priv->update_interval < 0) {
3189 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3190 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3191 parse->priv->update_interval);
3194 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3195 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3196 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3197 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3198 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3199 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3203 * gst_base_parse_set_has_timing_info:
3204 * @parse: a #GstBaseParse
3205 * @has_timing: whether frames carry timing information
3207 * Set if frames carry timing information which the subclass can (generally)
3208 * parse and provide. In particular, intrinsic (rather than estimated) time
3209 * can be obtained following a seek.
3214 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3216 parse->priv->has_timing_info = has_timing;
3217 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3221 * gst_base_parse_set_syncable:
3222 * @parse: a #GstBaseParse
3223 * @syncable: set if frame starts can be identified
3225 * Set if frame starts can be identified. This is set by default and
3226 * determines whether seeking based on bitrate averages
3227 * is possible for a format/stream.
3232 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3234 parse->priv->syncable = syncable;
3235 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3239 * gst_base_parse_set_passthrough:
3240 * @parse: a #GstBaseParse
3241 * @passthrough: %TRUE if parser should run in passthrough mode
3243 * Set if the nature of the format or configuration does not allow (much)
3244 * parsing, and the parser should operate in passthrough mode (which only
3245 * applies when operating in push mode). That is, incoming buffers are
3246 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3247 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3248 * so subclass can perform as much or as little is appropriate for
3249 * passthrough semantics in @pre_push_frame.
3254 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3256 parse->priv->passthrough = passthrough;
3257 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3261 * gst_base_parse_set_latency:
3262 * @parse: a #GstBaseParse
3263 * @min_latency: minimum parse latency
3264 * @max_latency: maximum parse latency
3266 * Sets the minimum and maximum (which may likely be equal) latency introduced
3267 * by the parsing process. If there is such a latency, which depends on the
3268 * particular parsing of the format, it typically corresponds to 1 frame duration.
3273 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3274 GstClockTime max_latency)
3276 GST_OBJECT_LOCK (parse);
3277 parse->priv->min_latency = min_latency;
3278 parse->priv->max_latency = max_latency;
3279 GST_OBJECT_UNLOCK (parse);
3280 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3281 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3282 GST_TIME_ARGS (max_latency));
3286 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3287 GstClockTime * duration)
3289 gboolean res = FALSE;
3291 g_return_val_if_fail (duration != NULL, FALSE);
3293 *duration = GST_CLOCK_TIME_NONE;
3294 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3295 GST_LOG_OBJECT (parse, "using provided duration");
3296 *duration = parse->priv->duration;
3298 } else if (parse->priv->duration != -1) {
3299 GST_LOG_OBJECT (parse, "converting provided duration");
3300 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3301 parse->priv->duration, format, (gint64 *) duration);
3302 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3303 GST_LOG_OBJECT (parse, "using estimated duration");
3304 *duration = parse->priv->estimated_duration;
3308 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3309 GST_TIME_ARGS (*duration));
3314 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
3316 GstBaseParse *parse;
3317 gboolean res = FALSE;
3319 parse = GST_BASE_PARSE (parent);
3321 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3323 switch (GST_QUERY_TYPE (query)) {
3324 case GST_QUERY_POSITION:
3329 GST_DEBUG_OBJECT (parse, "position query");
3330 gst_query_parse_position (query, &format, NULL);
3332 /* try upstream first */
3333 res = gst_pad_query_default (pad, parent, query);
3335 /* Fall back on interpreting segment */
3336 GST_OBJECT_LOCK (parse);
3337 if (format == GST_FORMAT_BYTES) {
3338 dest_value = parse->priv->offset;
3340 } else if (format == parse->segment.format &&
3341 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
3342 dest_value = gst_segment_to_stream_time (&parse->segment,
3343 parse->segment.format, parse->segment.position);
3346 GST_OBJECT_UNLOCK (parse);
3348 /* no precise result, upstream no idea either, then best estimate */
3349 /* priv->offset is updated in both PUSH/PULL modes */
3350 res = gst_base_parse_convert (parse,
3351 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3354 gst_query_set_position (query, format, dest_value);
3358 case GST_QUERY_DURATION:
3361 GstClockTime duration;
3363 GST_DEBUG_OBJECT (parse, "duration query");
3364 gst_query_parse_duration (query, &format, NULL);
3366 /* consult upstream */
3367 res = gst_pad_query_default (pad, parent, query);
3369 /* otherwise best estimate from us */
3371 res = gst_base_parse_get_duration (parse, format, &duration);
3373 gst_query_set_duration (query, format, duration);
3377 case GST_QUERY_SEEKING:
3380 GstClockTime duration = GST_CLOCK_TIME_NONE;
3381 gboolean seekable = FALSE;
3383 GST_DEBUG_OBJECT (parse, "seeking query");
3384 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3386 /* consult upstream */
3387 res = gst_pad_query_default (pad, parent, query);
3389 /* we may be able to help if in TIME */
3390 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3391 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3392 /* already OK if upstream takes care */
3393 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3395 if (!(res && seekable)) {
3396 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3397 || duration == -1) {
3398 /* seekable if we still have a chance to get duration later on */
3400 parse->priv->upstream_seekable && parse->priv->update_interval;
3402 seekable = parse->priv->upstream_seekable;
3403 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3406 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3412 case GST_QUERY_FORMATS:
3413 gst_query_set_formatsv (query, 3, fmtlist);
3416 case GST_QUERY_CONVERT:
3418 GstFormat src_format, dest_format;
3419 gint64 src_value, dest_value;
3421 gst_query_parse_convert (query, &src_format, &src_value,
3422 &dest_format, &dest_value);
3424 res = gst_base_parse_convert (parse, src_format, src_value,
3425 dest_format, &dest_value);
3427 gst_query_set_convert (query, src_format, src_value,
3428 dest_format, dest_value);
3432 case GST_QUERY_LATENCY:
3434 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3436 GstClockTime min_latency, max_latency;
3438 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3439 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3440 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3441 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3443 GST_OBJECT_LOCK (parse);
3444 /* add our latency */
3445 if (min_latency != -1)
3446 min_latency += parse->priv->min_latency;
3447 if (max_latency != -1)
3448 max_latency += parse->priv->max_latency;
3449 GST_OBJECT_UNLOCK (parse);
3451 gst_query_set_latency (query, live, min_latency, max_latency);
3456 res = gst_pad_query_default (pad, parent, query);
3462 /* scans for a cluster start from @pos,
3463 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3464 static GstFlowReturn
3465 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3466 GstClockTime * time, GstClockTime * duration)
3468 GstBaseParseClass *klass;
3470 gboolean orig_drain, orig_discont;
3471 GstFlowReturn ret = GST_FLOW_OK;
3472 GstBuffer *buf = NULL;
3473 GstBaseParseFrame frame;
3475 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3476 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3477 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3479 klass = GST_BASE_PARSE_GET_CLASS (parse);
3481 *time = GST_CLOCK_TIME_NONE;
3482 *duration = GST_CLOCK_TIME_NONE;
3485 orig_offset = parse->priv->offset;
3486 orig_discont = parse->priv->discont;
3487 orig_drain = parse->priv->drain;
3489 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3490 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3492 gst_base_parse_frame_init (&frame);
3494 /* jump elsewhere and locate next frame */
3495 parse->priv->offset = *pos;
3496 ret = gst_base_parse_scan_frame (parse, klass, &frame, FALSE);
3497 if (ret != GST_FLOW_OK)
3501 GST_LOG_OBJECT (parse,
3502 "peek parsing frame at offset %" G_GUINT64_FORMAT
3503 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
3504 GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET (buf),
3505 gst_buffer_get_size (buf));
3507 /* get offset first, subclass parsing might dump other stuff in there */
3508 *pos = GST_BUFFER_OFFSET (buf);
3509 ret = klass->parse_frame (parse, &frame);
3512 /* but it should provide proper time */
3513 *time = GST_BUFFER_TIMESTAMP (buf);
3514 *duration = GST_BUFFER_DURATION (buf);
3516 gst_base_parse_frame_free (&frame);
3518 GST_LOG_OBJECT (parse,
3519 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3520 GST_TIME_ARGS (*time), *pos);
3524 parse->priv->offset = orig_offset;
3525 parse->priv->discont = orig_discont;
3526 parse->priv->drain = orig_drain;
3531 /* bisect and scan through file for frame starting before @time,
3532 * returns OK and @time/@offset if found, NONE and/or error otherwise
3533 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3534 static GstFlowReturn
3535 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3538 GstFlowReturn ret = GST_FLOW_OK;
3539 gint64 lpos, hpos, newpos;
3540 GstClockTime time, ltime, htime, newtime, dur;
3541 gboolean cont = TRUE;
3542 const GstClockTime tolerance = TARGET_DIFFERENCE;
3543 const guint chunk = 4 * 1024;
3545 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3546 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3548 /* TODO also make keyframe aware if useful some day */
3563 /* do not know at first */
3565 *_time = GST_CLOCK_TIME_NONE;
3567 /* need initial positions; start and end */
3568 lpos = parse->priv->first_frame_offset;
3569 ltime = parse->priv->first_frame_ts;
3570 htime = parse->priv->duration;
3571 hpos = parse->priv->upstream_size;
3573 /* check preconditions are satisfied;
3574 * start and end are needed, except for special case where we scan for
3575 * last frame to determine duration */
3576 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
3577 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3578 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3582 /* shortcut cases */
3585 } else if (time < ltime + tolerance) {
3589 } else if (time >= htime) {
3595 while (htime > ltime && cont) {
3596 GST_LOG_OBJECT (parse,
3597 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3598 GST_TIME_ARGS (ltime));
3599 GST_LOG_OBJECT (parse,
3600 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3601 GST_TIME_ARGS (htime));
3602 if (G_UNLIKELY (time == G_MAXINT64)) {
3604 } else if (G_LIKELY (hpos > lpos)) {
3606 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3609 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3611 /* we check this case once, but not forever, so break loop */
3616 newpos = CLAMP (newpos, lpos, hpos);
3617 GST_LOG_OBJECT (parse,
3618 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3619 GST_TIME_ARGS (time), newpos);
3621 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3622 if (ret == GST_FLOW_EOS) {
3623 /* heuristic HACK */
3624 hpos = MAX (lpos, hpos - chunk);
3626 } else if (ret != GST_FLOW_OK) {
3630 if (newtime == -1 || newpos == -1) {
3631 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3635 if (G_UNLIKELY (time == G_MAXINT64)) {
3638 if (GST_CLOCK_TIME_IS_VALID (dur))
3641 } else if (newtime > time) {
3643 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3645 } else if (newtime + tolerance > time) {
3646 /* close enough undershoot */
3650 } else if (newtime < ltime) {
3651 /* so a position beyond lpos resulted in earlier time than ltime ... */
3652 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3655 /* undershoot too far */
3656 newpos += newpos == lpos ? chunk : 0;
3657 lpos = CLAMP (newpos, lpos, hpos);
3663 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3664 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3669 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3670 gboolean before, GstClockTime * _ts)
3672 gint64 bytes = 0, ts = 0;
3673 GstIndexEntry *entry = NULL;
3675 if (time == GST_CLOCK_TIME_NONE) {
3681 g_static_mutex_lock (&parse->priv->index_lock);
3682 if (parse->priv->index) {
3683 /* Let's check if we have an index entry for that time */
3684 entry = gst_index_get_assoc_entry (parse->priv->index,
3685 parse->priv->index_id,
3686 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3687 GST_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3691 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3692 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3694 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3695 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3696 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3698 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3699 GST_TIME_ARGS (time));
3702 ts = GST_CLOCK_TIME_NONE;
3705 g_static_mutex_unlock (&parse->priv->index_lock);
3714 /* returns TRUE if seek succeeded */
3716 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3721 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3722 gboolean flush, update, res = TRUE, accurate;
3723 gint64 cur, stop, seekpos, seekstop;
3724 GstSegment seeksegment = { 0, };
3725 GstClockTime start_ts;
3727 gst_event_parse_seek (event, &rate, &format, &flags,
3728 &cur_type, &cur, &stop_type, &stop);
3730 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3731 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3732 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3733 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3735 /* no negative rates in push mode */
3736 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
3739 if (cur_type != GST_SEEK_TYPE_SET ||
3740 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3743 /* For any format other than TIME, see if upstream handles
3744 * it directly or fail. For TIME, try upstream, but do it ourselves if
3745 * it fails upstream */
3746 if (format != GST_FORMAT_TIME) {
3747 /* default action delegates to upstream */
3751 gst_event_ref (event);
3752 if ((res = gst_pad_push_event (parse->sinkpad, event))) {
3757 /* get flush flag */
3758 flush = flags & GST_SEEK_FLAG_FLUSH;
3760 /* copy segment, we need this because we still need the old
3761 * segment when we close the current segment. */
3762 gst_segment_copy_into (&parse->segment, &seeksegment);
3764 GST_DEBUG_OBJECT (parse, "configuring seek");
3765 gst_segment_do_seek (&seeksegment, rate, format, flags,
3766 cur_type, cur, stop_type, stop, &update);
3768 /* accurate seeking implies seek tables are used to obtain position,
3769 * and the requested segment is maintained exactly, not adjusted any way */
3770 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3772 /* maybe we can be accurate for (almost) free */
3773 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
3774 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
3775 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3779 GstClockTime startpos = seeksegment.position;
3781 /* accurate requested, so ... seek a bit before target */
3782 if (startpos < parse->priv->lead_in_ts)
3785 startpos -= parse->priv->lead_in_ts;
3786 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3787 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3790 start_ts = seeksegment.position;
3791 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.position,
3792 GST_FORMAT_BYTES, &seekpos))
3793 goto convert_failed;
3794 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3795 GST_FORMAT_BYTES, &seekstop))
3796 goto convert_failed;
3799 GST_DEBUG_OBJECT (parse,
3800 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3802 GST_DEBUG_OBJECT (parse,
3803 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3804 seeksegment.stop, seekstop);
3806 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
3809 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3812 if (parse->srcpad) {
3813 GST_DEBUG_OBJECT (parse, "sending flush start");
3814 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3815 /* unlock upstream pull_range */
3816 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3819 gst_pad_pause_task (parse->sinkpad);
3822 /* we should now be able to grab the streaming thread because we stopped it
3823 * with the above flush/pause code */
3824 GST_PAD_STREAM_LOCK (parse->sinkpad);
3826 /* save current position */
3827 last_stop = parse->segment.position;
3828 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3831 /* now commit to new position */
3833 /* prepare for streaming again */
3835 GST_DEBUG_OBJECT (parse, "sending flush stop");
3836 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop (TRUE));
3837 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop (TRUE));
3838 gst_base_parse_clear_queues (parse);
3840 /* keep track of our position */
3841 seeksegment.base = gst_segment_to_running_time (&seeksegment,
3842 seeksegment.format, parse->segment.position);
3845 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3847 /* store the newsegment event so it can be sent from the streaming thread. */
3848 if (parse->priv->pending_segment)
3849 gst_event_unref (parse->priv->pending_segment);
3851 /* This will be sent later in _loop() */
3852 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
3854 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3855 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3856 ", pos = %" GST_TIME_FORMAT, format,
3857 GST_TIME_ARGS (parse->segment.start),
3858 GST_TIME_ARGS (parse->segment.stop),
3859 GST_TIME_ARGS (parse->segment.start));
3861 /* one last chance in pull mode to stay accurate;
3862 * maybe scan and subclass can find where to go */
3865 GstClockTime ts = seeksegment.position;
3867 gst_base_parse_locate_time (parse, &ts, &scanpos);
3871 /* running collected index now consists of several intervals,
3872 * so optimized check no longer possible */
3873 parse->priv->index_last_valid = FALSE;
3874 parse->priv->index_last_offset = 0;
3875 parse->priv->index_last_ts = 0;
3879 /* mark discont if we are going to stream from another position. */
3880 if (seekpos != parse->priv->offset) {
3881 GST_DEBUG_OBJECT (parse,
3882 "mark DISCONT, we did a seek to another position");
3883 parse->priv->offset = seekpos;
3884 parse->priv->last_offset = seekpos;
3885 parse->priv->seen_keyframe = FALSE;
3886 parse->priv->discont = TRUE;
3887 parse->priv->next_ts = start_ts;
3888 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3889 parse->priv->sync_offset = seekpos;
3890 parse->priv->exact_position = accurate;
3893 /* Start streaming thread if paused */
3894 gst_pad_start_task (parse->sinkpad,
3895 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3897 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3902 GstEvent *new_event;
3903 GstBaseParseSeek *seek;
3904 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
3906 /* The only thing we need to do in PUSH-mode is to send the
3907 seek event (in bytes) to upstream. Segment / flush handling happens
3908 in corresponding src event handlers */
3909 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3910 if (seekstop >= 0 && seekstop <= seekpos)
3912 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
3913 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3915 /* store segment info so its precise details can be reconstructed when
3916 * receiving newsegment;
3917 * this matters for all details when accurate seeking,
3918 * is most useful to preserve NONE stop time otherwise */
3919 seek = g_new0 (GstBaseParseSeek, 1);
3920 seek->segment = seeksegment;
3921 seek->accurate = accurate;
3922 seek->offset = seekpos;
3923 seek->start_ts = start_ts;
3924 GST_OBJECT_LOCK (parse);
3925 /* less optimal, but preserves order */
3926 parse->priv->pending_seeks =
3927 g_slist_append (parse->priv->pending_seeks, seek);
3928 GST_OBJECT_UNLOCK (parse);
3930 res = gst_pad_push_event (parse->sinkpad, new_event);
3933 GST_OBJECT_LOCK (parse);
3934 parse->priv->pending_seeks =
3935 g_slist_remove (parse->priv->pending_seeks, seek);
3936 GST_OBJECT_UNLOCK (parse);
3942 /* handled event is ours to free */
3944 gst_event_unref (event);
3950 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
3956 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
3962 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
3968 /* Checks if bitrates are available from upstream tags so that we don't
3969 * override them later
3972 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
3974 GstTagList *taglist = NULL;
3977 gst_event_parse_tag (event, &taglist);
3979 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
3980 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
3981 parse->priv->post_min_bitrate = FALSE;
3983 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
3984 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
3985 parse->priv->post_avg_bitrate = FALSE;
3987 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
3988 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
3989 parse->priv->post_max_bitrate = FALSE;
3994 gst_base_parse_set_index (GstElement * element, GstIndex * index)
3996 GstBaseParse *parse = GST_BASE_PARSE (element);
3998 g_static_mutex_lock (&parse->priv->index_lock);
3999 if (parse->priv->index)
4000 gst_object_unref (parse->priv->index);
4002 parse->priv->index = gst_object_ref (index);
4003 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4004 &parse->priv->index_id);
4005 parse->priv->own_index = FALSE;
4007 parse->priv->index = NULL;
4009 g_static_mutex_unlock (&parse->priv->index_lock);
4013 gst_base_parse_get_index (GstElement * element)
4015 GstBaseParse *parse = GST_BASE_PARSE (element);
4016 GstIndex *result = NULL;
4018 g_static_mutex_lock (&parse->priv->index_lock);
4019 if (parse->priv->index)
4020 result = gst_object_ref (parse->priv->index);
4021 g_static_mutex_unlock (&parse->priv->index_lock);
4026 static GstStateChangeReturn
4027 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4029 GstBaseParse *parse;
4030 GstStateChangeReturn result;
4032 parse = GST_BASE_PARSE (element);
4034 switch (transition) {
4035 case GST_STATE_CHANGE_READY_TO_PAUSED:
4036 /* If this is our own index destroy it as the
4037 * old entries might be wrong for the new stream */
4038 g_static_mutex_lock (&parse->priv->index_lock);
4039 if (parse->priv->own_index) {
4040 gst_object_unref (parse->priv->index);
4041 parse->priv->index = NULL;
4042 parse->priv->own_index = FALSE;
4045 /* If no index was created, generate one */
4046 if (G_UNLIKELY (!parse->priv->index)) {
4047 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4049 parse->priv->index = gst_index_factory_make ("memindex");
4050 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4051 &parse->priv->index_id);
4052 parse->priv->own_index = TRUE;
4054 g_static_mutex_unlock (&parse->priv->index_lock);
4060 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4062 switch (transition) {
4063 case GST_STATE_CHANGE_PAUSED_TO_READY:
4064 gst_base_parse_reset (parse);