2 * Copyright (C) 2008 Nokia Corporation. All rights reserved.
3 * Contact: Stefan Kost <stefan.kost@nokia.com>
4 * Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
5 * Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
6 * Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
25 * SECTION:gstbaseparse
26 * @short_description: Base class for stream parsers
27 * @see_also: #GstBaseTransform
29 * This base class is for parser elements that process data and splits it
30 * into separate audio/video/whatever frames.
34 * <listitem><para>provides one sink pad and one source pad</para></listitem>
35 * <listitem><para>handles state changes</para></listitem>
36 * <listitem><para>can operate in pull mode or push mode</para></listitem>
37 * <listitem><para>handles seeking in both modes</para></listitem>
38 * <listitem><para>handles events (NEWSEGMENT/EOS/FLUSH)</para></listitem>
40 * handles queries (POSITION/DURATION/SEEKING/FORMAT/CONVERT)
42 * <listitem><para>handles flushing</para></listitem>
45 * The purpose of this base class is to provide the basic functionality of
46 * a parser and share a lot of rather complex code.
48 * Description of the parsing mechanism:
51 * <itemizedlist><title>Set-up phase</title>
53 * GstBaseParse class calls @set_sink_caps to inform the subclass about
54 * incoming sinkpad caps. Subclass should set the srcpad caps accordingly.
57 * GstBaseParse calls @start to inform subclass that data processing is
61 * At least at this point subclass needs to tell the GstBaseParse class
62 * how big data chunks it wants to receive (min_frame_size). It can do
63 * this with gst_base_parse_set_min_frame_size().
66 * GstBaseParse class sets up appropriate data passing mode (pull/push)
67 * and starts to process the data.
73 * <title>Parsing phase</title>
75 * GstBaseParse gathers at least min_frame_size bytes of data either
76 * by pulling it from upstream or collecting buffers in an internal
80 * A buffer of (at least) min_frame_size bytes is passed to subclass with
81 * @check_valid_frame. Subclass checks the contents and returns TRUE
82 * if the buffer contains a valid frame. It also needs to set the
83 * @framesize according to the detected frame size. If buffer didn't
84 * contain a valid frame, this call must return FALSE and optionally
85 * set the @skipsize value to inform base class that how many bytes
86 * it needs to skip in order to find a valid frame. @framesize can always
87 * indicate a new minimum for current frame parsing. Indicating G_MAXUINT
88 * for requested amount means subclass simply needs best available
89 * subsequent data. In push mode this amounts to an additional input buffer
90 * (thus minimal additional latency), in pull mode this amounts to some
91 * arbitrary reasonable buffer size increase. The passed buffer
92 * is read-only. Note that @check_valid_frame might receive any small
93 * amount of input data when leftover data is being drained (e.g. at EOS).
96 * After valid frame is found, it will be passed again to subclass with
97 * @parse_frame call. Now subclass is responsible for parsing the
98 * frame contents and setting the caps, and buffer metadata (e.g.
99 * buffer timestamp and duration, or keyframe if applicable).
100 * (although the latter can also be done by GstBaseParse if it is
101 * appropriately configured, see below). Frame is provided with
102 * timestamp derived from upstream (as much as generally possible),
103 * duration obtained from configuration (see below), and offset
104 * if meaningful (in pull mode).
107 * Finally the buffer can be pushed downstream and the parsing loop starts
108 * over again. Just prior to actually pushing the buffer in question,
109 * it is passed to @pre_push_frame which gives subclass yet one
110 * last chance to examine buffer metadata, or to send some custom (tag)
111 * events, or to perform custom (segment) filtering.
114 * During the parsing process GstBaseParseClass will handle both srcpad
115 * and sinkpad events. They will be passed to subclass if @event or
116 * @src_event callbacks have been provided.
121 * <itemizedlist><title>Shutdown phase</title>
123 * GstBaseParse class calls @stop to inform the subclass that data
124 * parsing will be stopped.
130 * Subclass is responsible for providing pad template caps for
131 * source and sink pads. The pads need to be named "sink" and "src". It also
132 * needs to set the fixed caps on srcpad, when the format is ensured (e.g.
133 * when base class calls subclass' @set_sink_caps function).
135 * This base class uses #GST_FORMAT_DEFAULT as a meaning of frames. So,
136 * subclass conversion routine needs to know that conversion from
137 * #GST_FORMAT_TIME to #GST_FORMAT_DEFAULT must return the
138 * frame number that can be found from the given byte position.
140 * GstBaseParse uses subclasses conversion methods also for seeking (or
141 * otherwise uses its own default one, see also below).
143 * Subclass @start and @stop functions will be called to inform the beginning
144 * and end of data processing.
146 * Things that subclass need to take care of:
148 * <listitem><para>Provide pad templates</para></listitem>
150 * Fixate the source pad caps when appropriate
153 * Inform base class how big data chunks should be retrieved. This is
154 * done with gst_base_parse_set_min_frame_size() function.
157 * Examine data chunks passed to subclass with @check_valid_frame
158 * and tell if they contain a valid frame
161 * Set the caps and timestamp to frame that is passed to subclass with
162 * @parse_frame function.
164 * <listitem><para>Provide conversion functions</para></listitem>
166 * Update the duration information with gst_base_parse_set_duration()
169 * Optionally passthrough using gst_base_parse_set_passthrough()
172 * Configure various baseparse parameters using
173 * gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
174 * and gst_base_parse_set_frame_rate().
177 * In particular, if subclass is unable to determine a duration, but
178 * parsing (or specs) yields a frames per seconds rate, then this can be
179 * provided to GstBaseParse to enable it to cater for
180 * buffer time metadata (which will be taken from upstream as much as
181 * possible). Internally keeping track of frame durations and respective
182 * sizes that have been pushed provides GstBaseParse with an estimated
183 * bitrate. A default @convert (used if not overriden) will then use these
184 * rates to perform obvious conversions. These rates are also used to
185 * update (estimated) duration at regular frame intervals.
192 * - In push mode provide a queue of adapter-"queued" buffers for upstream
194 * - Queue buffers/events until caps are set
204 #include <gst/base/gstadapter.h>
206 #include "gstbaseparse.h"
208 #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
210 #define MIN_FRAMES_TO_POST_BITRATE 10
211 #define TARGET_DIFFERENCE (20 * GST_SECOND)
213 GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
214 #define GST_CAT_DEFAULT gst_base_parse_debug
216 /* Supported formats */
217 static const GstFormat fmtlist[] = {
224 #define GST_BASE_PARSE_GET_PRIVATE(obj) \
225 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
227 struct _GstBaseParsePrivate
234 GstFormat duration_fmt;
235 gint64 estimated_duration;
236 gint64 estimated_drift;
238 guint min_frame_size;
239 gboolean passthrough;
241 gboolean has_timing_info;
242 guint fps_num, fps_den;
243 gint update_interval;
245 guint lead_in, lead_out;
246 GstClockTime lead_in_ts, lead_out_ts;
247 GstClockTime min_latency, max_latency;
255 GstClockTime next_ts;
256 GstClockTime prev_ts;
257 GstClockTime frame_duration;
258 gboolean seen_keyframe;
263 guint64 data_bytecount;
264 guint64 acc_duration;
265 GstClockTime first_frame_ts;
266 gint64 first_frame_offset;
268 gboolean post_min_bitrate;
269 gboolean post_avg_bitrate;
270 gboolean post_max_bitrate;
274 guint posted_avg_bitrate;
276 GList *pending_events;
278 /* frames/buffers that are queued and ready to go on OK */
279 GQueue queued_frames;
283 /* index entry storage, either ours or provided */
287 GStaticMutex index_lock;
289 /* seek table entries only maintained if upstream is BYTE seekable */
290 gboolean upstream_seekable;
291 gboolean upstream_has_duration;
292 gint64 upstream_size;
293 /* minimum distance between two index entries */
294 GstClockTimeDiff idx_interval;
295 /* ts and offset of last entry added */
296 GstClockTime index_last_ts;
297 gint64 index_last_offset;
298 gboolean index_last_valid;
300 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
301 gboolean exact_position;
302 /* seek events are temporarily kept to match them with newsegments */
303 GSList *pending_seeks;
305 /* reverse playback */
306 GSList *buffers_pending;
307 GSList *buffers_queued;
308 GSList *buffers_send;
309 GstClockTime last_ts;
312 /* Newsegment event to be sent after SEEK */
313 GstEvent *pending_segment;
315 /* Segment event that closes the running segment prior to SEEK */
316 GstEvent *close_segment;
318 /* push mode helper frame */
319 GstBaseParseFrame frame;
321 /* TRUE if we're still detecting the format, i.e.
322 * if ::detect() is still called for future buffers */
324 GList *detect_buffers;
325 guint detect_buffers_size;
328 typedef struct _GstBaseParseSeek
333 GstClockTime start_ts;
336 static GstElementClass *parent_class = NULL;
338 static void gst_base_parse_class_init (GstBaseParseClass * klass);
339 static void gst_base_parse_init (GstBaseParse * parse,
340 GstBaseParseClass * klass);
343 gst_base_parse_get_type (void)
345 static volatile gsize base_parse_type = 0;
347 if (g_once_init_enter (&base_parse_type)) {
348 static const GTypeInfo base_parse_info = {
349 sizeof (GstBaseParseClass),
350 (GBaseInitFunc) NULL,
351 (GBaseFinalizeFunc) NULL,
352 (GClassInitFunc) gst_base_parse_class_init,
355 sizeof (GstBaseParse),
357 (GInstanceInitFunc) gst_base_parse_init,
361 _type = g_type_register_static (GST_TYPE_ELEMENT,
362 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
363 g_once_init_leave (&base_parse_type, _type);
365 return (GType) base_parse_type;
368 static void gst_base_parse_finalize (GObject * object);
370 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
371 GstStateChange transition);
372 static void gst_base_parse_reset (GstBaseParse * parse);
374 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
375 static GstIndex *gst_base_parse_get_index (GstElement * element);
377 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
379 static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
380 GstObject * parent, GstPadMode mode, gboolean active);
381 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
383 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
385 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
387 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
390 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
392 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
395 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
397 static void gst_base_parse_loop (GstPad * pad);
399 static gboolean gst_base_parse_check_frame (GstBaseParse * parse,
400 GstBaseParseFrame * frame, guint * framesize, gint * skipsize);
401 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
402 GstBaseParseFrame * frame);
404 static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse,
407 static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse,
410 static void gst_base_parse_drain (GstBaseParse * parse);
412 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
413 gboolean post_min, gboolean post_avg, gboolean post_max);
415 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
416 GstClockTime time, gboolean before, GstClockTime * _ts);
417 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
418 GstClockTime * _time, gint64 * _offset);
420 static GstFlowReturn gst_base_parse_process_fragment (GstBaseParse * parse,
423 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
426 gst_base_parse_clear_queues (GstBaseParse * parse)
428 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
429 g_slist_free (parse->priv->buffers_queued);
430 parse->priv->buffers_queued = NULL;
431 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
433 g_slist_free (parse->priv->buffers_pending);
434 parse->priv->buffers_pending = NULL;
435 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
436 g_slist_free (parse->priv->buffers_send);
437 parse->priv->buffers_send = NULL;
439 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
440 g_list_free (parse->priv->detect_buffers);
441 parse->priv->detect_buffers = NULL;
442 parse->priv->detect_buffers_size = 0;
446 gst_base_parse_finalize (GObject * object)
448 GstBaseParse *parse = GST_BASE_PARSE (object);
451 g_object_unref (parse->priv->adapter);
453 if (parse->priv->pending_segment) {
454 p_ev = &parse->priv->pending_segment;
455 gst_event_replace (p_ev, NULL);
457 if (parse->priv->close_segment) {
458 p_ev = &parse->priv->close_segment;
459 gst_event_replace (p_ev, NULL);
462 if (parse->priv->cache) {
463 gst_buffer_unref (parse->priv->cache);
464 parse->priv->cache = NULL;
467 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
469 g_list_free (parse->priv->pending_events);
470 parse->priv->pending_events = NULL;
472 g_queue_foreach (&parse->priv->queued_frames,
473 (GFunc) gst_base_parse_frame_free, NULL);
474 g_queue_clear (&parse->priv->queued_frames);
476 if (parse->priv->index) {
477 gst_object_unref (parse->priv->index);
478 parse->priv->index = NULL;
481 g_static_mutex_free (&parse->priv->index_lock);
483 gst_base_parse_clear_queues (parse);
485 G_OBJECT_CLASS (parent_class)->finalize (object);
489 gst_base_parse_class_init (GstBaseParseClass * klass)
491 GObjectClass *gobject_class;
492 GstElementClass *gstelement_class;
494 gobject_class = G_OBJECT_CLASS (klass);
495 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
496 parent_class = g_type_class_peek_parent (klass);
497 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
499 gstelement_class = (GstElementClass *) klass;
500 gstelement_class->change_state =
501 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
502 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
503 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
505 /* Default handlers */
506 klass->check_valid_frame = gst_base_parse_check_frame;
507 klass->parse_frame = gst_base_parse_parse_frame;
508 klass->src_event = gst_base_parse_src_eventfunc;
509 klass->convert = gst_base_parse_convert_default;
511 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
512 "baseparse element");
516 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
518 GstPadTemplate *pad_template;
520 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
522 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
525 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
526 g_return_if_fail (pad_template != NULL);
527 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
528 gst_pad_set_event_function (parse->sinkpad,
529 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
530 gst_pad_set_query_function (parse->sinkpad,
531 GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
532 gst_pad_set_chain_function (parse->sinkpad,
533 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
534 gst_pad_set_activate_function (parse->sinkpad,
535 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
536 gst_pad_set_activatemode_function (parse->sinkpad,
537 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
538 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
540 GST_DEBUG_OBJECT (parse, "sinkpad created");
543 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
544 g_return_if_fail (pad_template != NULL);
545 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
546 gst_pad_set_event_function (parse->srcpad,
547 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
548 gst_pad_set_query_function (parse->srcpad,
549 GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
550 gst_pad_use_fixed_caps (parse->srcpad);
551 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
552 GST_DEBUG_OBJECT (parse, "src created");
554 g_queue_init (&parse->priv->queued_frames);
556 parse->priv->adapter = gst_adapter_new ();
558 parse->priv->pad_mode = GST_PAD_MODE_NONE;
560 g_static_mutex_init (&parse->priv->index_lock);
563 gst_base_parse_reset (parse);
564 GST_DEBUG_OBJECT (parse, "init ok");
567 static GstBaseParseFrame *
568 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
570 GstBaseParseFrame *copy;
572 copy = g_slice_dup (GstBaseParseFrame, frame);
573 copy->buffer = gst_buffer_ref (frame->buffer);
574 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
576 GST_TRACE ("copied frame %p -> %p", frame, copy);
582 gst_base_parse_frame_free (GstBaseParseFrame * frame)
584 GST_TRACE ("freeing frame %p", frame);
587 gst_buffer_unref (frame->buffer);
588 frame->buffer = NULL;
591 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
592 g_slice_free (GstBaseParseFrame, frame);
594 memset (frame, 0, sizeof (*frame));
599 gst_base_parse_frame_get_type (void)
601 static volatile gsize frame_type = 0;
603 if (g_once_init_enter (&frame_type)) {
606 _type = g_boxed_type_register_static ("GstBaseParseFrame",
607 (GBoxedCopyFunc) gst_base_parse_frame_copy,
608 (GBoxedFreeFunc) gst_base_parse_frame_free);
609 g_once_init_leave (&frame_type, _type);
611 return (GType) frame_type;
615 * gst_base_parse_frame_init:
616 * @frame: #GstBaseParseFrame.
618 * Sets a #GstBaseParseFrame to initial state. Currently this means
619 * all public fields are zero-ed and a private flag is set to make
620 * sure gst_base_parse_frame_free() only frees the contents but not
621 * the actual frame. Use this function to initialise a #GstBaseParseFrame
622 * allocated on the stack.
627 gst_base_parse_frame_init (GstBaseParseFrame * frame)
629 memset (frame, 0, sizeof (GstBaseParseFrame));
630 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
631 GST_TRACE ("inited frame %p", frame);
635 * gst_base_parse_frame_new:
636 * @buffer: (transfer none): a #GstBuffer
638 * @overhead: number of bytes in this frame which should be counted as
639 * metadata overhead, ie. not used to calculate the average bitrate.
640 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
642 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
643 * elements written in C should usually allocate the frame on the stack and
644 * then use gst_base_parse_frame_init() to initialise it.
646 * Returns: a newly-allocated #GstBaseParseFrame. Free with
647 * gst_base_parse_frame_free() when no longer needed, unless you gave
648 * away ownership to gst_base_parse_push_frame().
653 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
656 GstBaseParseFrame *frame;
658 frame = g_slice_new0 (GstBaseParseFrame);
659 frame->buffer = gst_buffer_ref (buffer);
661 GST_TRACE ("created frame %p", frame);
666 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
669 gst_buffer_replace (&frame->buffer, buf);
673 /* set flags one by one for clarity */
674 if (G_UNLIKELY (parse->priv->drain))
675 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
677 /* losing sync is pretty much a discont (and vice versa), no ? */
678 if (G_UNLIKELY (parse->priv->discont))
679 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
683 gst_base_parse_reset (GstBaseParse * parse)
685 GST_OBJECT_LOCK (parse);
686 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
687 parse->priv->duration = -1;
688 parse->priv->min_frame_size = 1;
689 parse->priv->discont = TRUE;
690 parse->priv->flushing = FALSE;
691 parse->priv->offset = 0;
692 parse->priv->sync_offset = 0;
693 parse->priv->update_interval = -1;
694 parse->priv->fps_num = parse->priv->fps_den = 0;
695 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
696 parse->priv->lead_in = parse->priv->lead_out = 0;
697 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
698 parse->priv->bitrate = 0;
699 parse->priv->framecount = 0;
700 parse->priv->bytecount = 0;
701 parse->priv->acc_duration = 0;
702 parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE;
703 parse->priv->first_frame_offset = -1;
704 parse->priv->estimated_duration = -1;
705 parse->priv->estimated_drift = 0;
706 parse->priv->next_ts = 0;
707 parse->priv->syncable = TRUE;
708 parse->priv->passthrough = FALSE;
709 parse->priv->has_timing_info = FALSE;
710 parse->priv->post_min_bitrate = TRUE;
711 parse->priv->post_avg_bitrate = TRUE;
712 parse->priv->post_max_bitrate = TRUE;
713 parse->priv->min_bitrate = G_MAXUINT;
714 parse->priv->max_bitrate = 0;
715 parse->priv->avg_bitrate = 0;
716 parse->priv->posted_avg_bitrate = 0;
718 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
719 parse->priv->index_last_offset = -1;
720 parse->priv->index_last_valid = TRUE;
721 parse->priv->upstream_seekable = FALSE;
722 parse->priv->upstream_size = 0;
723 parse->priv->upstream_has_duration = FALSE;
724 parse->priv->idx_interval = 0;
725 parse->priv->exact_position = TRUE;
726 parse->priv->seen_keyframe = FALSE;
728 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
729 parse->priv->last_offset = 0;
731 if (parse->priv->pending_segment) {
732 gst_event_unref (parse->priv->pending_segment);
733 parse->priv->pending_segment = NULL;
736 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
738 g_list_free (parse->priv->pending_events);
739 parse->priv->pending_events = NULL;
741 if (parse->priv->cache) {
742 gst_buffer_unref (parse->priv->cache);
743 parse->priv->cache = NULL;
746 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
747 g_slist_free (parse->priv->pending_seeks);
748 parse->priv->pending_seeks = NULL;
750 /* we know it is not alloc'ed, but maybe other stuff to free, some day ... */
751 parse->priv->frame._private_flags |=
752 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
753 gst_base_parse_frame_free (&parse->priv->frame);
755 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
756 g_list_free (parse->priv->detect_buffers);
757 parse->priv->detect_buffers = NULL;
758 parse->priv->detect_buffers_size = 0;
759 GST_OBJECT_UNLOCK (parse);
762 /* gst_base_parse_check_frame:
763 * @parse: #GstBaseParse.
764 * @buffer: GstBuffer.
765 * @framesize: This will be set to tell the found frame size in bytes.
766 * @skipsize: Output parameter that tells how much data needs to be skipped
767 * in order to find the following frame header.
769 * Default callback for check_valid_frame.
771 * Returns: Always TRUE.
774 gst_base_parse_check_frame (GstBaseParse * parse,
775 GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
777 *framesize = gst_buffer_get_size (frame->buffer);
783 /* gst_base_parse_parse_frame:
784 * @parse: #GstBaseParse.
785 * @buffer: #GstBuffer.
787 * Default callback for parse_frame.
790 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
792 GstBuffer *buffer = frame->buffer;
794 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
795 GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) {
796 GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts;
798 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
799 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
800 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
805 /* gst_base_parse_convert:
806 * @parse: #GstBaseParse.
807 * @src_format: #GstFormat describing the source format.
808 * @src_value: Source value to be converted.
809 * @dest_format: #GstFormat defining the converted format.
810 * @dest_value: Pointer where the conversion result will be put.
812 * Converts using configured "convert" vmethod in #GstBaseParse class.
814 * Returns: TRUE if conversion was successful.
817 gst_base_parse_convert (GstBaseParse * parse,
818 GstFormat src_format,
819 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
821 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
824 g_return_val_if_fail (dest_value != NULL, FALSE);
829 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
831 #ifndef GST_DISABLE_GST_DEBUG
834 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
835 GST_LOG_OBJECT (parse,
836 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
837 GST_TIME_ARGS (src_value), *dest_value);
838 } else if (dest_format == GST_FORMAT_TIME &&
839 src_format == GST_FORMAT_BYTES) {
840 GST_LOG_OBJECT (parse,
841 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
842 src_value, GST_TIME_ARGS (*dest_value));
844 GST_LOG_OBJECT (parse,
845 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
846 GST_STR_NULL (gst_format_get_name (src_format)),
847 GST_STR_NULL (gst_format_get_name (dest_format)),
848 src_value, *dest_value);
851 GST_DEBUG_OBJECT (parse, "conversion failed");
859 /* gst_base_parse_sink_event:
860 * @pad: #GstPad that received the event.
861 * @event: #GstEvent to be handled.
863 * Handler for sink pad events.
865 * Returns: TRUE if the event was handled.
868 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
871 GstBaseParseClass *bclass;
872 gboolean handled = FALSE;
875 parse = GST_BASE_PARSE (parent);
876 bclass = GST_BASE_PARSE_GET_CLASS (parse);
878 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
879 GST_EVENT_TYPE_NAME (event));
881 /* Cache all events except EOS, SEGMENT and FLUSH_STOP if we have a
883 if (parse->priv->pending_segment && GST_EVENT_TYPE (event) != GST_EVENT_EOS
884 && GST_EVENT_TYPE (event) != GST_EVENT_SEGMENT
885 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
886 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP
887 && GST_EVENT_TYPE (event) != GST_EVENT_CAPS) {
889 if (GST_EVENT_TYPE (event) == GST_EVENT_TAG)
890 /* See if any bitrate tags were posted */
891 gst_base_parse_handle_tag (parse, event);
893 parse->priv->pending_events =
894 g_list_append (parse->priv->pending_events, event);
898 if (GST_EVENT_TYPE (event) == GST_EVENT_EOS &&
899 parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
900 /* We've not posted bitrate tags yet - do so now */
901 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
904 handled = bclass->event (parse, event);
907 handled = gst_base_parse_sink_eventfunc (parse, event);
910 ret = gst_pad_event_default (pad, parent, event);
913 GST_DEBUG_OBJECT (parse, "event handled");
919 /* gst_base_parse_sink_eventfunc:
920 * @parse: #GstBaseParse.
921 * @event: #GstEvent to be handled.
923 * Element-level event handler function.
925 * The event will be unreffed only if it has been handled and this
926 * function returns %TRUE
928 * Returns: %TRUE if the event was handled and not need forwarding.
931 gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event)
933 gboolean handled = FALSE;
936 switch (GST_EVENT_TYPE (event)) {
940 GstBaseParseClass *klass;
942 klass = GST_BASE_PARSE_GET_CLASS (parse);
944 gst_event_parse_caps (event, &caps);
945 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
947 if (klass->set_sink_caps)
948 klass->set_sink_caps (parse, caps);
950 /* will send our own caps downstream */
951 gst_event_unref (event);
955 case GST_EVENT_SEGMENT:
957 const GstSegment *in_segment;
958 GstSegment out_segment;
959 gint64 offset = 0, next_ts;
962 gdouble rate, applied_rate;
964 gint64 start, stop, pos, next_ts;
968 gst_event_parse_segment (event, &in_segment);
969 gst_segment_init (&out_segment, GST_FORMAT_TIME);
971 GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
973 if (in_segment->format == GST_FORMAT_BYTES) {
974 GstBaseParseSeek *seek = NULL;
977 /* stop time is allowed to be open-ended, but not start & pos */
978 offset = in_segment->time;
980 GST_OBJECT_LOCK (parse);
981 for (node = parse->priv->pending_seeks; node; node = node->next) {
982 GstBaseParseSeek *tmp = node->data;
984 if (tmp->offset == offset) {
989 parse->priv->pending_seeks =
990 g_slist_remove (parse->priv->pending_seeks, seek);
991 GST_OBJECT_UNLOCK (parse);
994 GST_DEBUG_OBJECT (parse,
995 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
996 seek->accurate ? " accurate" : "", &seek->segment);
998 out_segment.start = seek->segment.start;
999 out_segment.stop = seek->segment.stop;
1000 out_segment.time = seek->segment.start;
1002 next_ts = seek->start_ts;
1003 parse->priv->exact_position = seek->accurate;
1006 /* best attempt convert */
1007 /* as these are only estimates, stop is kept open-ended to avoid
1008 * premature cutting */
1009 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
1010 GST_FORMAT_TIME, (gint64 *) & next_ts);
1012 out_segment.start = next_ts;
1013 out_segment.stop = GST_CLOCK_TIME_NONE;
1014 out_segment.time = next_ts;
1016 parse->priv->exact_position = (in_segment->start == 0);
1019 gst_event_unref (event);
1021 event = gst_event_new_segment (&out_segment);
1023 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1024 GST_SEGMENT_FORMAT, in_segment);
1026 } else if (in_segment->format != GST_FORMAT_TIME) {
1027 /* Unknown incoming segment format. Output a default open-ended
1029 gst_event_unref (event);
1031 out_segment.start = 0;
1032 out_segment.stop = GST_CLOCK_TIME_NONE;;
1033 out_segment.time = 0;;
1035 event = gst_event_new_segment (&out_segment);
1039 /* not considered BYTE seekable if it is talking to us in TIME,
1040 * whatever else it might claim */
1041 parse->priv->upstream_seekable = FALSE;
1042 next_ts = in_segment->start;
1045 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1048 gst_segment_set_newsegment (&parse->segment, update, rate,
1049 applied_rate, format, start, stop, start);
1052 /* save the segment for later, right before we push a new buffer so that
1053 * the caps are fixed and the next linked element can receive
1055 eventp = &parse->priv->pending_segment;
1056 gst_event_replace (eventp, event);
1057 gst_event_unref (event);
1060 /* but finish the current segment */
1061 GST_DEBUG_OBJECT (parse, "draining current segment");
1062 if (in_segment->rate > 0.0)
1063 gst_base_parse_drain (parse);
1065 gst_base_parse_process_fragment (parse, FALSE);
1066 gst_adapter_clear (parse->priv->adapter);
1068 parse->priv->offset = offset;
1069 parse->priv->sync_offset = offset;
1070 parse->priv->next_ts = next_ts;
1071 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1072 parse->priv->discont = TRUE;
1073 parse->priv->seen_keyframe = FALSE;
1077 case GST_EVENT_FLUSH_START:
1078 parse->priv->flushing = TRUE;
1079 handled = gst_pad_push_event (parse->srcpad, gst_event_ref (event));
1081 gst_event_unref (event);
1082 /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
1083 GST_PAD_STREAM_LOCK (parse->srcpad);
1084 GST_PAD_STREAM_UNLOCK (parse->srcpad);
1088 case GST_EVENT_FLUSH_STOP:
1089 gst_adapter_clear (parse->priv->adapter);
1090 gst_base_parse_clear_queues (parse);
1091 parse->priv->flushing = FALSE;
1092 parse->priv->discont = TRUE;
1093 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1094 parse->priv->frame._private_flags |=
1095 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
1096 gst_base_parse_frame_free (&parse->priv->frame);
1100 if (parse->segment.rate > 0.0)
1101 gst_base_parse_drain (parse);
1103 gst_base_parse_process_fragment (parse, FALSE);
1105 /* If we STILL have zero frames processed, fire an error */
1106 if (parse->priv->framecount == 0) {
1107 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1108 ("No valid frames found before end of stream"), (NULL));
1110 /* newsegment before eos */
1111 if (parse->priv->pending_segment) {
1112 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
1113 parse->priv->pending_segment = NULL;
1125 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1127 GstBaseParse *parse;
1128 GstBaseParseClass *bclass;
1131 parse = GST_BASE_PARSE (parent);
1132 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1134 switch (GST_QUERY_TYPE (query)) {
1135 case GST_QUERY_CAPS:
1137 if (bclass->get_sink_caps) {
1138 GstCaps *caps, *filter;
1140 gst_query_parse_caps (query, &filter);
1141 caps = bclass->get_sink_caps (parse, filter);
1142 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1144 gst_query_set_caps_result (query, caps);
1145 gst_caps_unref (caps);
1149 GstCaps *caps, *filter;
1151 gst_query_parse_caps (query, &filter);
1152 caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
1153 gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
1154 gst_query_set_caps_result (query, caps);
1155 gst_caps_unref (caps);
1163 res = gst_pad_query_default (pad, parent, query);
1172 /* gst_base_parse_src_event:
1173 * @pad: #GstPad that received the event.
1174 * @event: #GstEvent that was received.
1176 * Handler for source pad events.
1178 * Returns: TRUE if the event was handled.
1181 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1183 GstBaseParse *parse;
1184 GstBaseParseClass *bclass;
1185 gboolean handled = FALSE;
1186 gboolean ret = TRUE;
1188 parse = GST_BASE_PARSE (parent);
1189 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1191 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1192 GST_EVENT_TYPE_NAME (event));
1194 if (bclass->src_event)
1195 handled = bclass->src_event (parse, event);
1198 ret = gst_pad_event_default (pad, parent, event);
1204 gst_base_parse_is_seekable (GstBaseParse * parse)
1206 /* FIXME: could do more here, e.g. check index or just send data from 0
1207 * in pull mode and let decoder/sink clip */
1208 return parse->priv->syncable;
1211 /* gst_base_parse_src_eventfunc:
1212 * @parse: #GstBaseParse.
1213 * @event: #GstEvent that was received.
1215 * Default srcpad event handler.
1217 * Returns: TRUE if the event was handled and can be dropped.
1220 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1222 gboolean handled = FALSE;
1224 switch (GST_EVENT_TYPE (event)) {
1225 case GST_EVENT_SEEK:
1227 if (gst_base_parse_is_seekable (parse)) {
1228 handled = gst_base_parse_handle_seek (parse, event);
1240 * gst_base_parse_convert_default:
1241 * @parse: #GstBaseParse.
1242 * @src_format: #GstFormat describing the source format.
1243 * @src_value: Source value to be converted.
1244 * @dest_format: #GstFormat defining the converted format.
1245 * @dest_value: Pointer where the conversion result will be put.
1247 * Default implementation of "convert" vmethod in #GstBaseParse class.
1249 * Returns: TRUE if conversion was successful.
1254 gst_base_parse_convert_default (GstBaseParse * parse,
1255 GstFormat src_format,
1256 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1258 gboolean ret = FALSE;
1259 guint64 bytes, duration;
1261 if (G_UNLIKELY (src_format == dest_format)) {
1262 *dest_value = src_value;
1266 if (G_UNLIKELY (src_value == -1)) {
1271 if (G_UNLIKELY (src_value == 0)) {
1276 /* need at least some frames */
1277 if (!parse->priv->framecount)
1280 duration = parse->priv->acc_duration / GST_MSECOND;
1281 bytes = parse->priv->bytecount;
1283 if (G_UNLIKELY (!duration || !bytes))
1286 if (src_format == GST_FORMAT_BYTES) {
1287 if (dest_format == GST_FORMAT_TIME) {
1288 /* BYTES -> TIME conversion */
1289 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1290 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1291 *dest_value *= GST_MSECOND;
1292 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1293 *dest_value / GST_MSECOND);
1296 } else if (src_format == GST_FORMAT_TIME) {
1297 if (dest_format == GST_FORMAT_BYTES) {
1298 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1299 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1301 GST_DEBUG_OBJECT (parse,
1302 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1303 src_value / GST_MSECOND, *dest_value);
1306 } else if (src_format == GST_FORMAT_DEFAULT) {
1307 /* DEFAULT == frame-based */
1308 if (dest_format == GST_FORMAT_TIME) {
1309 if (parse->priv->fps_den) {
1310 *dest_value = gst_util_uint64_scale (src_value,
1311 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1314 } else if (dest_format == GST_FORMAT_BYTES) {
1322 gst_base_parse_update_duration (GstBaseParse * baseparse)
1325 GstBaseParse *parse;
1327 parse = GST_BASE_PARSE (baseparse);
1329 peer = gst_pad_get_peer (parse->sinkpad);
1331 gboolean qres = FALSE;
1332 gint64 ptot, dest_value;
1334 qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot);
1335 gst_object_unref (GST_OBJECT (peer));
1337 if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1338 GST_FORMAT_TIME, &dest_value)) {
1340 /* inform if duration changed, but try to avoid spamming */
1341 parse->priv->estimated_drift +=
1342 dest_value - parse->priv->estimated_duration;
1343 if (parse->priv->estimated_drift > GST_SECOND ||
1344 parse->priv->estimated_drift < -GST_SECOND) {
1345 gst_element_post_message (GST_ELEMENT (parse),
1346 gst_message_new_duration (GST_OBJECT (parse),
1347 GST_FORMAT_TIME, dest_value));
1348 parse->priv->estimated_drift = 0;
1350 parse->priv->estimated_duration = dest_value;
1351 GST_LOG_OBJECT (parse,
1352 "updated estimated duration to %" GST_TIME_FORMAT,
1353 GST_TIME_ARGS (dest_value));
1360 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1361 gboolean post_avg, gboolean post_max)
1363 GstTagList *taglist = NULL;
1365 if (post_min && parse->priv->post_min_bitrate) {
1366 taglist = gst_tag_list_new_empty ();
1368 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1369 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1372 if (post_avg && parse->priv->post_avg_bitrate) {
1373 if (taglist == NULL)
1374 taglist = gst_tag_list_new_empty ();
1376 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1377 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1378 parse->priv->avg_bitrate, NULL);
1381 if (post_max && parse->priv->post_max_bitrate) {
1382 if (taglist == NULL)
1383 taglist = gst_tag_list_new_empty ();
1385 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1386 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1389 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1390 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1391 parse->priv->max_bitrate);
1393 if (taglist != NULL) {
1394 gst_pad_push_event (parse->srcpad, gst_event_new_tag (taglist));
1398 /* gst_base_parse_update_bitrates:
1399 * @parse: #GstBaseParse.
1400 * @buffer: Current frame as a #GstBuffer
1402 * Keeps track of the minimum and maximum bitrates, and also maintains a
1403 * running average bitrate of the stream so far.
1406 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1408 /* Only update the tag on a 10 kbps delta */
1409 static const gint update_threshold = 10000;
1411 guint64 data_len, frame_dur;
1412 gint overhead, frame_bitrate, old_avg_bitrate;
1413 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1414 GstBuffer *buffer = frame->buffer;
1416 overhead = frame->overhead;
1420 data_len = gst_buffer_get_size (buffer) - overhead;
1421 parse->priv->data_bytecount += data_len;
1423 /* duration should be valid by now,
1424 * either set by subclass or maybe based on fps settings */
1425 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1426 /* Calculate duration of a frame from buffer properties */
1427 frame_dur = GST_BUFFER_DURATION (buffer);
1428 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1429 parse->priv->acc_duration;
1432 /* No way to figure out frame duration (is this even possible?) */
1436 /* override if subclass provided bitrate, e.g. metadata based */
1437 if (parse->priv->bitrate) {
1438 parse->priv->avg_bitrate = parse->priv->bitrate;
1439 /* spread this (confirmed) info ASAP */
1440 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1441 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1445 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1449 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1450 parse->priv->avg_bitrate);
1452 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1454 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1455 /* always post all at threshold time */
1456 update_min = update_max = update_avg = TRUE;
1459 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1460 if (frame_bitrate < parse->priv->min_bitrate) {
1461 parse->priv->min_bitrate = frame_bitrate;
1465 if (frame_bitrate > parse->priv->max_bitrate) {
1466 parse->priv->max_bitrate = frame_bitrate;
1470 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1471 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1472 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1477 if ((update_min || update_avg || update_max))
1478 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1480 /* If average bitrate changes that much and no valid (time) duration provided,
1481 * then post a new duration message so applications can update their cached
1483 if (update_avg && !(parse->priv->duration_fmt == GST_FORMAT_TIME &&
1484 GST_CLOCK_TIME_IS_VALID (parse->priv->duration)))
1485 gst_element_post_message (GST_ELEMENT (parse),
1486 gst_message_new_duration (GST_OBJECT (parse), GST_FORMAT_TIME, -1));
1493 * gst_base_parse_add_index_entry:
1494 * @parse: #GstBaseParse.
1495 * @offset: offset of entry
1496 * @ts: timestamp associated with offset
1497 * @key: whether entry refers to keyframe
1498 * @force: add entry disregarding sanity checks
1500 * Adds an entry to the index associating @offset to @ts. It is recommended
1501 * to only add keyframe entries. @force allows to bypass checks, such as
1502 * whether the stream is (upstream) seekable, another entry is already "close"
1503 * to the new entry, etc.
1505 * Returns: #gboolean indicating whether entry was added
1510 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1511 GstClockTime ts, gboolean key, gboolean force)
1513 gboolean ret = FALSE;
1514 GstIndexAssociation associations[2];
1516 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1517 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1519 if (G_LIKELY (!force)) {
1521 if (!parse->priv->upstream_seekable) {
1522 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1526 /* FIXME need better helper data structure that handles these issues
1527 * related to ongoing collecting of index entries */
1528 if (parse->priv->index_last_offset >= (gint64) offset) {
1529 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1530 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1534 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1535 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1536 parse->priv->idx_interval) {
1537 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1538 GST_TIME_ARGS (parse->priv->index_last_ts));
1542 /* if last is not really the last one */
1543 if (!parse->priv->index_last_valid) {
1544 GstClockTime prev_ts;
1546 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1547 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1548 GST_DEBUG_OBJECT (parse,
1549 "entry too close to existing entry %" GST_TIME_FORMAT,
1550 GST_TIME_ARGS (prev_ts));
1551 parse->priv->index_last_offset = offset;
1552 parse->priv->index_last_ts = ts;
1558 associations[0].format = GST_FORMAT_TIME;
1559 associations[0].value = ts;
1560 associations[1].format = GST_FORMAT_BYTES;
1561 associations[1].value = offset;
1563 /* index might change on-the-fly, although that would be nutty app ... */
1564 g_static_mutex_lock (&parse->priv->index_lock);
1565 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1566 (key) ? GST_ASSOCIATION_FLAG_KEY_UNIT : GST_ASSOCIATION_FLAG_DELTA_UNIT,
1567 2, (const GstIndexAssociation *) &associations);
1568 g_static_mutex_unlock (&parse->priv->index_lock);
1571 parse->priv->index_last_offset = offset;
1572 parse->priv->index_last_ts = ts;
1581 /* check for seekable upstream, above and beyond a mere query */
1583 gst_base_parse_check_seekability (GstBaseParse * parse)
1586 gboolean seekable = FALSE;
1587 gint64 start = -1, stop = -1;
1588 guint idx_interval = 0;
1590 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1591 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1592 GST_DEBUG_OBJECT (parse, "seeking query failed");
1596 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1598 /* try harder to query upstream size if we didn't get it the first time */
1599 if (seekable && stop == -1) {
1600 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1601 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1604 /* if upstream doesn't know the size, it's likely that it's not seekable in
1605 * practice even if it technically may be seekable */
1606 if (seekable && (start != 0 || stop <= start)) {
1607 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1611 /* let's not put every single frame into our index */
1613 if (stop < 10 * 1024 * 1024)
1615 else if (stop < 100 * 1024 * 1024)
1618 idx_interval = 1000;
1622 gst_query_unref (query);
1624 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1625 G_GUINT64_FORMAT ")", seekable, start, stop);
1626 parse->priv->upstream_seekable = seekable;
1627 parse->priv->upstream_size = seekable ? stop : 0;
1629 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1630 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1633 /* some misc checks on upstream */
1635 gst_base_parse_check_upstream (GstBaseParse * parse)
1639 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
1640 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1641 /* upstream has one, accept it also, and no further updates */
1642 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1643 parse->priv->upstream_has_duration = TRUE;
1646 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1647 parse->priv->upstream_has_duration);
1650 /* checks src caps to determine if dealing with audio or video */
1651 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1653 gst_base_parse_check_media (GstBaseParse * parse)
1658 caps = gst_pad_get_current_caps (parse->srcpad);
1659 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1660 parse->priv->is_video =
1661 g_str_has_prefix (gst_structure_get_name (s), "video");
1663 /* historical default */
1664 parse->priv->is_video = FALSE;
1667 gst_caps_unref (caps);
1669 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1672 /* takes ownership of frame */
1674 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1676 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1677 /* frame allocated on the heap, we can just take ownership */
1678 g_queue_push_tail (&parse->priv->queued_frames, frame);
1679 GST_TRACE ("queued frame %p", frame);
1681 GstBaseParseFrame *copy;
1683 /* probably allocated on the stack, must make a proper copy */
1684 copy = gst_base_parse_frame_copy (frame);
1685 g_queue_push_tail (&parse->priv->queued_frames, copy);
1686 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1687 gst_base_parse_frame_free (frame);
1691 /* gst_base_parse_handle_and_push_buffer:
1692 * @parse: #GstBaseParse.
1693 * @klass: #GstBaseParseClass.
1694 * @frame: (transfer full): a #GstBaseParseFrame
1696 * Parses the frame from given buffer and pushes it forward. Also performs
1697 * timestamp handling and checks the segment limits.
1699 * This is called with srcpad STREAM_LOCK held.
1701 * Returns: #GstFlowReturn
1703 static GstFlowReturn
1704 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1705 GstBaseParseClass * klass, GstBaseParseFrame * frame)
1711 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1713 buffer = frame->buffer;
1715 if (parse->priv->discont) {
1716 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1717 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1718 parse->priv->discont = FALSE;
1721 /* some one-time start-up */
1722 if (G_UNLIKELY (!parse->priv->framecount)) {
1723 gst_base_parse_check_seekability (parse);
1724 gst_base_parse_check_upstream (parse);
1727 GST_LOG_OBJECT (parse,
1728 "parsing frame at offset %" G_GUINT64_FORMAT
1729 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
1730 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1731 gst_buffer_get_size (buffer));
1733 /* use default handler to provide initial (upstream) metadata */
1734 gst_base_parse_parse_frame (parse, frame);
1736 /* store offset as it might get overwritten */
1737 offset = GST_BUFFER_OFFSET (buffer);
1738 ret = klass->parse_frame (parse, frame);
1740 buffer = frame->buffer;
1741 /* subclass must play nice */
1742 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1744 /* check if subclass/format can provide ts.
1745 * If so, that allows and enables extra seek and duration determining options */
1746 if (G_UNLIKELY (parse->priv->first_frame_offset < 0 && ret == GST_FLOW_OK)) {
1747 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1748 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1749 parse->priv->first_frame_offset = offset;
1750 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1751 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1752 " for first frame at offset %" G_GINT64_FORMAT,
1753 GST_TIME_ARGS (parse->priv->first_frame_ts),
1754 parse->priv->first_frame_offset);
1755 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1757 GstClockTime last_ts = G_MAXINT64;
1759 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1760 gst_base_parse_locate_time (parse, &last_ts, &off);
1761 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1762 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1765 /* disable further checks */
1766 parse->priv->first_frame_offset = 0;
1770 /* again use default handler to add missing metadata;
1771 * we may have new information on frame properties */
1772 gst_base_parse_parse_frame (parse, frame);
1773 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1774 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1775 parse->priv->next_ts =
1776 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1778 /* we lost track, do not produce bogus time next time around
1779 * (probably means parser subclass has given up on parsing as well) */
1780 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1781 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1784 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1785 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1786 gst_base_parse_add_index_entry (parse, offset,
1787 GST_BUFFER_TIMESTAMP (buffer),
1788 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1790 /* First buffers are dropped, this means that the subclass needs more
1791 * frames to decide on the format and queues them internally */
1792 /* convert internal flow to OK and mark discont for the next buffer. */
1793 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1794 gst_base_parse_frame_free (frame);
1796 } else if (ret == GST_BASE_PARSE_FLOW_QUEUED) {
1797 gst_base_parse_queue_frame (parse, frame);
1799 } else if (ret != GST_FLOW_OK) {
1803 /* All OK, push queued frames if there are any */
1804 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1805 GstBaseParseFrame *queued_frame;
1807 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1808 gst_base_parse_push_frame (parse, queued_frame);
1812 return gst_base_parse_push_frame (parse, frame);
1816 * gst_base_parse_push_frame:
1817 * @parse: #GstBaseParse.
1818 * @frame: (transfer full): a #GstBaseParseFrame
1820 * Pushes the frame downstream, sends any pending events and
1821 * does some timestamp and segment handling. Takes ownership
1822 * of @frame and will clear it (if it was initialised with
1823 * gst_base_parse_frame_init()) or free it.
1825 * This must be called with sinkpad STREAM_LOCK held.
1827 * Returns: #GstFlowReturn
1832 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1834 GstFlowReturn ret = GST_FLOW_OK;
1835 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1836 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1837 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1841 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1842 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1844 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1846 buffer = frame->buffer;
1848 GST_LOG_OBJECT (parse,
1849 "processing buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT
1850 ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer),
1851 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1852 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1855 size = gst_buffer_get_size (buffer);
1856 parse->priv->bytecount += size;
1857 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1858 parse->priv->framecount++;
1859 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1860 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1863 /* 0 means disabled */
1864 if (parse->priv->update_interval < 0)
1865 parse->priv->update_interval = 50;
1866 else if (parse->priv->update_interval > 0 &&
1867 (parse->priv->framecount % parse->priv->update_interval) == 0)
1868 gst_base_parse_update_duration (parse);
1870 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1871 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1872 if (last_start != GST_CLOCK_TIME_NONE
1873 && GST_BUFFER_DURATION_IS_VALID (buffer))
1874 last_stop = last_start + GST_BUFFER_DURATION (buffer);
1876 /* should have caps by now */
1877 g_return_val_if_fail (gst_pad_has_current_caps (parse->srcpad),
1880 /* segment adjustment magic; only if we are running the whole show */
1881 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
1882 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
1883 parse->priv->upstream_seekable)) {
1884 /* segment times are typically estimates,
1885 * actual frame data might lead subclass to different timestamps,
1886 * so override segment start from what is supplied there */
1887 if (G_UNLIKELY (parse->priv->pending_segment && !parse->priv->exact_position
1888 && GST_CLOCK_TIME_IS_VALID (last_start))) {
1889 gst_event_unref (parse->priv->pending_segment);
1890 parse->segment.start =
1891 MIN ((guint64) last_start, (guint64) parse->segment.stop);
1893 GST_DEBUG_OBJECT (parse,
1894 "adjusting pending segment start to %" GST_TIME_FORMAT,
1895 GST_TIME_ARGS (parse->segment.start));
1897 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
1899 /* handle gaps, e.g. non-zero start-time, in as much not handled by above */
1900 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
1901 GST_CLOCK_TIME_IS_VALID (last_start)) {
1902 GstClockTimeDiff diff;
1904 /* only send newsegments with increasing start times,
1905 * otherwise if these go back and forth downstream (sinks) increase
1906 * accumulated time and running_time */
1907 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
1908 if (G_UNLIKELY (diff > 2 * GST_SECOND
1909 && last_start > parse->segment.start
1910 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
1911 || last_start < parse->segment.stop))) {
1913 GST_DEBUG_OBJECT (parse,
1914 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
1915 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
1916 "Sending updated NEWSEGMENT events", diff,
1917 GST_TIME_ARGS (parse->segment.position),
1918 GST_TIME_ARGS (last_start));
1920 if (G_UNLIKELY (parse->priv->pending_segment)) {
1921 gst_event_unref (parse->priv->pending_segment);
1922 parse->segment.start = last_start;
1923 parse->segment.time = last_start;
1924 parse->priv->pending_segment =
1925 gst_event_new_segment (&parse->segment);
1927 /* skip gap FIXME */
1928 gst_pad_push_event (parse->srcpad,
1929 gst_event_new_segment (&parse->segment));
1931 parse->segment.position = last_start;
1936 /* and should then also be linked downstream, so safe to send some events */
1937 if (G_UNLIKELY (parse->priv->close_segment)) {
1938 /* only set up by loop */
1939 GST_DEBUG_OBJECT (parse, "loop sending close segment");
1940 gst_pad_push_event (parse->srcpad, parse->priv->close_segment);
1941 parse->priv->close_segment = NULL;
1943 if (G_UNLIKELY (parse->priv->pending_segment)) {
1944 GstEvent *pending_segment;
1946 pending_segment = parse->priv->pending_segment;
1947 parse->priv->pending_segment = NULL;
1949 GST_DEBUG_OBJECT (parse, "%s push pending segment",
1950 parse->priv->pad_mode == GST_PAD_MODE_PULL ? "loop" : "chain");
1951 gst_pad_push_event (parse->srcpad, pending_segment);
1953 /* have caps; check identity */
1954 gst_base_parse_check_media (parse);
1957 /* update bitrates and optionally post corresponding tags
1958 * (following newsegment) */
1959 gst_base_parse_update_bitrates (parse, frame);
1961 if (G_UNLIKELY (parse->priv->pending_events)) {
1964 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
1965 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
1967 g_list_free (parse->priv->pending_events);
1968 parse->priv->pending_events = NULL;
1971 if (klass->pre_push_frame) {
1972 ret = klass->pre_push_frame (parse, frame);
1974 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
1977 /* take final ownership of frame buffer */
1978 buffer = frame->buffer;
1979 frame->buffer = NULL;
1981 /* subclass must play nice */
1982 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1984 parse->priv->seen_keyframe |= parse->priv->is_video &&
1985 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
1987 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
1988 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1989 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
1990 GST_BUFFER_TIMESTAMP (buffer) >
1991 parse->segment.stop + parse->priv->lead_out_ts) {
1992 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
1994 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1995 GST_BUFFER_DURATION_IS_VALID (buffer) &&
1996 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
1997 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
1998 parse->priv->lead_in_ts < parse->segment.start) {
1999 if (parse->priv->seen_keyframe) {
2000 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
2003 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
2004 ret = GST_BASE_PARSE_FLOW_DROPPED;
2011 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2012 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2013 gst_buffer_unref (buffer);
2015 } else if (ret == GST_FLOW_OK) {
2016 if (parse->segment.rate > 0.0) {
2017 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2019 ret = gst_pad_push (parse->srcpad, buffer);
2020 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2022 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2024 parse->priv->buffers_queued =
2025 g_slist_prepend (parse->priv->buffers_queued, buffer);
2029 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2030 size, gst_flow_get_name (ret));
2031 gst_buffer_unref (buffer);
2032 /* if we are not sufficiently in control, let upstream decide on EOS */
2033 if (ret == GST_FLOW_EOS &&
2034 (parse->priv->passthrough ||
2035 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2036 !parse->priv->upstream_seekable)))
2040 /* Update current running segment position */
2041 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
2042 parse->segment.position < last_stop)
2043 parse->segment.position = last_stop;
2045 gst_base_parse_frame_free (frame);
2051 /* gst_base_parse_drain:
2053 * Drains the adapter until it is empty. It decreases the min_frame_size to
2054 * match the current adapter size and calls chain method until the adapter
2055 * is emptied or chain returns with error.
2058 gst_base_parse_drain (GstBaseParse * parse)
2062 GST_DEBUG_OBJECT (parse, "draining");
2063 parse->priv->drain = TRUE;
2066 avail = gst_adapter_available (parse->priv->adapter);
2070 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2071 NULL) != GST_FLOW_OK) {
2075 /* nothing changed, maybe due to truncated frame; break infinite loop */
2076 if (avail == gst_adapter_available (parse->priv->adapter)) {
2077 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2078 gst_adapter_clear (parse->priv->adapter);
2082 parse->priv->drain = FALSE;
2085 /* gst_base_parse_send_buffers
2087 * Sends buffers collected in send_buffers downstream, and ensures that list
2088 * is empty at the end (errors or not).
2090 static GstFlowReturn
2091 gst_base_parse_send_buffers (GstBaseParse * parse)
2093 GSList *send = NULL;
2095 GstFlowReturn ret = GST_FLOW_OK;
2097 send = parse->priv->buffers_send;
2101 buf = GST_BUFFER_CAST (send->data);
2102 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
2103 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2104 ", offset %" G_GINT64_FORMAT, buf,
2105 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
2106 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2108 /* iterate output queue an push downstream */
2109 ret = gst_pad_push (parse->srcpad, buf);
2110 send = g_slist_delete_link (send, send);
2112 /* clear any leftover if error */
2113 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2115 buf = GST_BUFFER_CAST (send->data);
2116 gst_buffer_unref (buf);
2117 send = g_slist_delete_link (send, send);
2122 parse->priv->buffers_send = send;
2127 /* gst_base_parse_process_fragment:
2129 * Processes a reverse playback (forward) fragment:
2130 * - append head of last fragment that was skipped to current fragment data
2131 * - drain the resulting current fragment data (i.e. repeated chain)
2132 * - add time/duration (if needed) to frames queued by chain
2133 * - push queued data
2135 static GstFlowReturn
2136 gst_base_parse_process_fragment (GstBaseParse * parse, gboolean push_only)
2139 GstFlowReturn ret = GST_FLOW_OK;
2140 gboolean seen_key = FALSE, seen_delta = FALSE;
2146 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2147 while (parse->priv->buffers_pending) {
2148 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2149 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2150 gst_buffer_get_size (buf));
2151 gst_adapter_push (parse->priv->adapter, buf);
2152 parse->priv->buffers_pending =
2153 g_slist_delete_link (parse->priv->buffers_pending,
2154 parse->priv->buffers_pending);
2157 /* invalidate so no fall-back timestamping is performed;
2158 * ok if taken from subclass or upstream */
2159 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2160 /* prevent it hanging around stop all the time */
2161 parse->segment.position = GST_CLOCK_TIME_NONE;
2163 parse->priv->discont = TRUE;
2165 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2166 /* initial skipped data is added to buffers_pending */
2167 gst_base_parse_drain (parse);
2170 if (parse->priv->buffers_send) {
2171 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2172 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2175 /* add metadata (if needed to queued buffers */
2176 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2177 GST_TIME_ARGS (parse->priv->last_ts));
2178 while (parse->priv->buffers_queued) {
2179 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2181 /* no touching if upstream or parsing provided time */
2182 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2183 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2184 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2185 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2186 GST_BUFFER_DURATION_IS_VALID (buf)) {
2187 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2188 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2190 parse->priv->last_ts = 0;
2191 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2192 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2193 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2195 /* no idea, very bad */
2196 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2199 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2201 /* reverse order for ascending sending */
2202 /* send downstream at keyframe not preceded by a keyframe
2203 * (e.g. that should identify start of collection of IDR nals) */
2204 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2206 ret = gst_base_parse_send_buffers (parse);
2207 /* if a problem, throw all to sending */
2208 if (ret != GST_FLOW_OK) {
2209 parse->priv->buffers_send =
2210 g_slist_reverse (parse->priv->buffers_queued);
2211 parse->priv->buffers_queued = NULL;
2220 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2222 parse->priv->buffers_send =
2223 g_slist_prepend (parse->priv->buffers_send, buf);
2224 parse->priv->buffers_queued =
2225 g_slist_delete_link (parse->priv->buffers_queued,
2226 parse->priv->buffers_queued);
2229 /* audio may have all marked as keyframe, so arrange to send here */
2231 ret = gst_base_parse_send_buffers (parse);
2233 /* any trailing unused no longer usable (ideally none) */
2234 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2235 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2236 gst_adapter_available (parse->priv->adapter));
2237 gst_adapter_clear (parse->priv->adapter);
2243 /* small helper that checks whether we have been trying to resync too long */
2244 static inline GstFlowReturn
2245 gst_base_parse_check_sync (GstBaseParse * parse)
2247 if (G_UNLIKELY (parse->priv->discont &&
2248 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2249 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2250 ("Failed to parse stream"), (NULL));
2251 return GST_FLOW_ERROR;
2257 static GstFlowReturn
2258 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
2260 GstBaseParseClass *bclass;
2261 GstBaseParse *parse;
2262 GstFlowReturn ret = GST_FLOW_OK;
2263 GstBuffer *outbuf = NULL;
2264 GstBuffer *tmpbuf = NULL;
2268 guint old_min_size = 0, min_size, av;
2269 GstClockTime timestamp;
2270 GstBaseParseFrame *frame;
2272 parse = GST_BASE_PARSE (parent);
2273 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2275 if (parse->priv->detecting) {
2276 GstBuffer *detect_buf;
2278 if (parse->priv->detect_buffers_size == 0) {
2279 detect_buf = gst_buffer_ref (buffer);
2284 detect_buf = gst_buffer_new ();
2286 for (l = parse->priv->detect_buffers; l; l = l->next) {
2287 gsize tmpsize = gst_buffer_get_size (l->data);
2289 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
2290 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
2294 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
2295 offset, gst_buffer_get_size (buffer));
2298 ret = bclass->detect (parse, detect_buf);
2299 gst_buffer_unref (detect_buf);
2301 if (ret == GST_FLOW_OK) {
2304 /* Detected something */
2305 parse->priv->detecting = FALSE;
2307 for (l = parse->priv->detect_buffers; l; l = l->next) {
2308 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2310 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2311 parent, GST_BUFFER_CAST (l->data));
2313 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2315 g_list_free (parse->priv->detect_buffers);
2316 parse->priv->detect_buffers = NULL;
2317 parse->priv->detect_buffers_size = 0;
2319 if (ret != GST_FLOW_OK) {
2323 /* Handle the current buffer */
2324 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2325 /* Still detecting, append buffer or error out if draining */
2327 if (parse->priv->drain) {
2328 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2329 return GST_FLOW_ERROR;
2330 } else if (parse->priv->flushing) {
2331 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2333 g_list_free (parse->priv->detect_buffers);
2334 parse->priv->detect_buffers = NULL;
2335 parse->priv->detect_buffers_size = 0;
2337 parse->priv->detect_buffers =
2338 g_list_append (parse->priv->detect_buffers, buffer);
2339 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
2343 /* Something went wrong, subclass responsible for error reporting */
2347 /* And now handle the current buffer if detection worked */
2350 frame = &parse->priv->frame;
2352 if (G_LIKELY (buffer)) {
2353 GST_LOG_OBJECT (parse,
2354 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT,
2355 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer));
2356 if (G_UNLIKELY (parse->priv->passthrough)) {
2357 gst_base_parse_frame_init (frame);
2358 frame->buffer = gst_buffer_make_writable (buffer);
2359 return gst_base_parse_push_frame (parse, frame);
2361 /* upstream feeding us in reverse playback;
2362 * gather each fragment, then process it in single run */
2363 if (parse->segment.rate < 0.0) {
2364 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2365 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2366 ret = gst_base_parse_process_fragment (parse, FALSE);
2368 gst_adapter_push (parse->priv->adapter, buffer);
2371 gst_adapter_push (parse->priv->adapter, buffer);
2374 if (G_UNLIKELY (buffer &&
2375 GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2376 frame->_private_flags |= GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
2377 gst_base_parse_frame_free (frame);
2380 /* Parse and push as many frames as possible */
2381 /* Stop either when adapter is empty or we are flushing */
2382 while (!parse->priv->flushing) {
2385 /* maintain frame state for a single frame parsing round across _chain calls,
2386 * so only init when needed */
2387 if (!frame->_private_flags)
2388 gst_base_parse_frame_init (frame);
2390 tmpbuf = gst_buffer_new ();
2393 /* Synchronization loop */
2395 /* note: if subclass indicates MAX fsize,
2396 * this will not likely be available anyway ... */
2397 min_size = MAX (parse->priv->min_frame_size, fsize);
2398 av = gst_adapter_available (parse->priv->adapter);
2400 /* loop safety check */
2401 if (G_UNLIKELY (old_min_size >= min_size))
2403 old_min_size = min_size;
2405 if (G_UNLIKELY (parse->priv->drain)) {
2407 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2408 if (G_UNLIKELY (!min_size)) {
2409 gst_buffer_unref (tmpbuf);
2414 /* Collect at least min_frame_size bytes */
2415 if (av < min_size) {
2416 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)",
2418 gst_buffer_unref (tmpbuf);
2422 /* always pass all available data */
2423 data = gst_adapter_map (parse->priv->adapter, av);
2424 gst_buffer_take_memory (tmpbuf, -1,
2425 gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY,
2426 (gpointer) data, NULL, av, 0, av));
2427 GST_BUFFER_OFFSET (tmpbuf) = parse->priv->offset;
2429 if (parse->priv->discont) {
2430 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2431 GST_BUFFER_FLAG_SET (tmpbuf, GST_BUFFER_FLAG_DISCONT);
2435 gst_base_parse_frame_update (parse, frame, tmpbuf);
2436 res = bclass->check_valid_frame (parse, frame, &fsize, &skip);
2437 gst_adapter_unmap (parse->priv->adapter);
2438 gst_buffer_replace (&frame->buffer, NULL);
2439 gst_buffer_remove_memory_range (tmpbuf, 0, -1);
2441 if (gst_adapter_available (parse->priv->adapter) < fsize) {
2442 GST_DEBUG_OBJECT (parse, "found valid frame but not enough data"
2443 " available (only %" G_GSIZE_FORMAT " bytes)",
2444 gst_adapter_available (parse->priv->adapter));
2445 gst_buffer_unref (tmpbuf);
2448 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2452 /* subclass didn't touch this value. By default we skip 1 byte */
2456 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2457 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2458 /* reverse playback, and no frames found yet, so we are skipping
2459 * the leading part of a fragment, which may form the tail of
2460 * fragment coming later, hopefully subclass skips efficiently ... */
2461 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2462 outbuf = gst_adapter_take_buffer (parse->priv->adapter, skip);
2463 outbuf = gst_buffer_make_writable (outbuf);
2464 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
2465 parse->priv->buffers_pending =
2466 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2469 gst_adapter_flush (parse->priv->adapter, skip);
2471 parse->priv->offset += skip;
2472 if (!parse->priv->discont)
2473 parse->priv->sync_offset = parse->priv->offset;
2474 parse->priv->discont = TRUE;
2475 /* something changed least; nullify loop check */
2478 /* skip == 0 should imply subclass set min_size to need more data;
2479 * we check this shortly */
2480 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2481 gst_buffer_unref (tmpbuf);
2485 gst_buffer_unref (tmpbuf);
2489 /* Subclass found the sync, but still wants to skip some data */
2490 GST_LOG_OBJECT (parse, "skipping %d bytes", skip);
2491 gst_adapter_flush (parse->priv->adapter, skip);
2492 parse->priv->offset += skip;
2495 /* Grab lock to prevent a race with FLUSH_START handler */
2496 GST_PAD_STREAM_LOCK (parse->srcpad);
2498 /* FLUSH_START event causes the "flushing" flag to be set. In this
2499 * case we can leave the frame pushing loop */
2500 if (parse->priv->flushing) {
2501 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2505 /* move along with upstream timestamp (if any),
2506 * but interpolate in between */
2507 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2508 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2509 (parse->priv->prev_ts != timestamp)) {
2510 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2513 /* FIXME: Would it be more efficient to make a subbuffer instead? */
2514 outbuf = gst_adapter_take_buffer (parse->priv->adapter, fsize);
2515 outbuf = gst_buffer_make_writable (outbuf);
2517 /* Subclass may want to know the data offset */
2518 GST_BUFFER_OFFSET (outbuf) = parse->priv->offset;
2519 parse->priv->offset += fsize;
2520 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2521 GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
2523 frame->buffer = outbuf;
2524 ret = gst_base_parse_handle_and_push_frame (parse, bclass, frame);
2525 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2527 if (ret != GST_FLOW_OK) {
2528 GST_LOG_OBJECT (parse, "push returned %d", ret);
2534 GST_LOG_OBJECT (parse, "chain leaving");
2540 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2541 ("min_size evolution %d -> %d; breaking to avoid looping",
2542 old_min_size, min_size));
2543 return GST_FLOW_ERROR;
2547 /* pull @size bytes at current offset,
2548 * i.e. at least try to and possibly return a shorter buffer if near the end */
2549 static GstFlowReturn
2550 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2551 GstBuffer ** buffer)
2553 GstFlowReturn ret = GST_FLOW_OK;
2555 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2557 /* Caching here actually makes much less difference than one would expect.
2558 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2559 if (parse->priv->cache) {
2560 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2561 gint cache_size = gst_buffer_get_size (parse->priv->cache);
2563 if (cache_offset <= parse->priv->offset &&
2564 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2565 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
2566 parse->priv->offset - cache_offset, size);
2567 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2570 /* not enough data in the cache, free cache and get a new one */
2571 gst_buffer_unref (parse->priv->cache);
2572 parse->priv->cache = NULL;
2575 /* refill the cache */
2577 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2578 64 * 1024), &parse->priv->cache);
2579 if (ret != GST_FLOW_OK) {
2580 parse->priv->cache = NULL;
2584 if (gst_buffer_get_size (parse->priv->cache) >= size) {
2586 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
2588 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2592 /* Not possible to get enough data, try a last time with
2593 * requesting exactly the size we need */
2594 gst_buffer_unref (parse->priv->cache);
2595 parse->priv->cache = NULL;
2597 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2598 &parse->priv->cache);
2600 if (ret != GST_FLOW_OK) {
2601 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2606 if (gst_buffer_get_size (parse->priv->cache) < size) {
2607 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2608 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
2609 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
2611 *buffer = parse->priv->cache;
2612 parse->priv->cache = NULL;
2618 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
2619 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2624 static GstFlowReturn
2625 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2628 GstClockTime ts = 0;
2632 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2633 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2634 parse->priv->last_offset);
2636 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2637 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2638 GST_TIME_ARGS (parse->segment.start));
2643 /* last fragment started at last_offset / last_ts;
2644 * seek back 10s capped at 1MB */
2645 if (parse->priv->last_ts >= 10 * GST_SECOND)
2646 ts = parse->priv->last_ts - 10 * GST_SECOND;
2647 /* if we are exact now, we will be more so going backwards */
2648 if (parse->priv->exact_position) {
2649 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2651 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2652 GST_FORMAT_BYTES, &offset)) {
2653 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2656 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2657 parse->priv->last_offset - 1024);
2658 offset = MAX (0, offset);
2660 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2662 parse->priv->offset = offset;
2664 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2666 if (ret != GST_FLOW_OK)
2669 /* offset will increase again as fragment is processed/parsed */
2670 parse->priv->last_offset = offset;
2672 gst_adapter_push (parse->priv->adapter, buffer);
2673 ret = gst_base_parse_process_fragment (parse, FALSE);
2674 if (ret != GST_FLOW_OK)
2677 /* force previous fragment */
2678 parse->priv->offset = -1;
2685 * pull and scan for next frame starting from current offset
2686 * ajusts sync, drain and offset going along */
2687 static GstFlowReturn
2688 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2689 GstBaseParseFrame * frame, gboolean full)
2691 GstBuffer *buffer, *outbuf;
2692 GstFlowReturn ret = GST_FLOW_OK;
2693 guint fsize = 1, min_size, old_min_size = 0;
2696 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2698 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2699 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2701 /* let's make this efficient for all subclass once and for all;
2702 * maybe it does not need this much, but in the latter case, we know we are
2703 * in pull mode here and might as well try to read and supply more anyway
2704 * (so does the buffer caching mechanism) */
2710 min_size = MAX (parse->priv->min_frame_size, fsize);
2711 /* loop safety check */
2712 if (G_UNLIKELY (old_min_size >= min_size))
2714 old_min_size = min_size;
2716 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2717 if (ret != GST_FLOW_OK)
2720 if (parse->priv->discont) {
2721 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2722 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
2725 /* if we got a short read, inform subclass we are draining leftover
2726 * and no more is to be expected */
2727 if (gst_buffer_get_size (buffer) < min_size)
2728 parse->priv->drain = TRUE;
2730 if (parse->priv->detecting) {
2731 ret = klass->detect (parse, buffer);
2732 if (ret == GST_FLOW_NOT_NEGOTIATED) {
2733 /* If draining we error out, otherwise request a buffer
2735 if (parse->priv->drain) {
2736 gst_buffer_unref (buffer);
2737 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
2738 return GST_FLOW_ERROR;
2741 gst_buffer_unref (buffer);
2744 } else if (ret != GST_FLOW_OK) {
2745 gst_buffer_unref (buffer);
2746 GST_ERROR_OBJECT (parse, "detect() returned %s",
2747 gst_flow_get_name (ret));
2751 /* Else handle this buffer normally */
2755 gst_base_parse_frame_update (parse, frame, buffer);
2756 res = klass->check_valid_frame (parse, frame, &fsize, &skip);
2757 gst_buffer_replace (&frame->buffer, NULL);
2759 parse->priv->drain = FALSE;
2760 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2763 parse->priv->drain = FALSE;
2767 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2768 if (full && parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2769 /* reverse playback, and no frames found yet, so we are skipping
2770 * the leading part of a fragment, which may form the tail of
2771 * fragment coming later, hopefully subclass skips efficiently ... */
2772 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, 0, skip);
2773 parse->priv->buffers_pending =
2774 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2777 parse->priv->offset += skip;
2778 if (!parse->priv->discont)
2779 parse->priv->sync_offset = parse->priv->offset;
2780 parse->priv->discont = TRUE;
2781 /* something changed at least; nullify loop check */
2782 if (fsize == G_MAXUINT)
2783 fsize = old_min_size + 64 * 1024;
2786 /* skip == 0 should imply subclass set min_size to need more data;
2787 * we check this shortly */
2788 GST_DEBUG_OBJECT (parse, "finding sync...");
2789 gst_buffer_unref (buffer);
2790 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2795 /* Does the subclass want to skip too? */
2797 parse->priv->offset += skip;
2801 if (fsize + skip <= gst_buffer_get_size (buffer)) {
2802 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, skip, fsize);
2803 GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer) + skip;
2804 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2805 gst_buffer_unref (buffer);
2807 gst_buffer_unref (buffer);
2808 ret = gst_base_parse_pull_range (parse, fsize, &outbuf);
2809 if (ret != GST_FLOW_OK)
2811 if (gst_buffer_get_size (outbuf) < fsize) {
2812 gst_buffer_unref (outbuf);
2817 parse->priv->offset += fsize;
2819 frame->buffer = outbuf;
2827 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2828 ("min_size evolution %d -> %d; breaking to avoid looping",
2829 old_min_size, min_size));
2830 return GST_FLOW_ERROR;
2834 /* Loop that is used in pull mode to retrieve data from upstream */
2836 gst_base_parse_loop (GstPad * pad)
2838 GstBaseParse *parse;
2839 GstBaseParseClass *klass;
2840 GstFlowReturn ret = GST_FLOW_OK;
2841 GstBaseParseFrame frame;
2843 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2844 klass = GST_BASE_PARSE_GET_CLASS (parse);
2846 /* reverse playback:
2847 * first fragment (closest to stop time) is handled normally below,
2848 * then we pull in fragments going backwards */
2849 if (parse->segment.rate < 0.0) {
2850 /* check if we jumped back to a previous fragment,
2851 * which is a post-first fragment */
2852 if (parse->priv->offset < 0) {
2853 ret = gst_base_parse_handle_previous_fragment (parse);
2858 gst_base_parse_frame_init (&frame);
2859 ret = gst_base_parse_scan_frame (parse, klass, &frame, TRUE);
2860 if (ret != GST_FLOW_OK)
2863 /* This always cleans up frame, even if error occurs */
2864 ret = gst_base_parse_handle_and_push_frame (parse, klass, &frame);
2866 /* eat expected eos signalling past segment in reverse playback */
2867 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
2868 parse->segment.position >= parse->segment.stop) {
2869 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2870 /* push what was accumulated during loop run */
2871 gst_base_parse_process_fragment (parse, TRUE);
2872 /* force previous fragment */
2873 parse->priv->offset = -1;
2878 if (ret == GST_FLOW_EOS)
2880 else if (ret != GST_FLOW_OK)
2883 gst_object_unref (parse);
2890 GST_DEBUG_OBJECT (parse, "eos");
2895 gboolean push_eos = FALSE;
2897 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2898 gst_flow_get_name (ret));
2899 gst_pad_pause_task (parse->sinkpad);
2901 if (ret == GST_FLOW_EOS) {
2902 /* handle end-of-stream/segment */
2903 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2906 if ((stop = parse->segment.stop) == -1)
2907 stop = parse->segment.duration;
2909 GST_DEBUG_OBJECT (parse, "sending segment_done");
2911 gst_element_post_message
2912 (GST_ELEMENT_CAST (parse),
2913 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2914 GST_FORMAT_TIME, stop));
2916 /* If we STILL have zero frames processed, fire an error */
2917 if (parse->priv->framecount == 0) {
2918 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2919 ("No valid frames found before end of stream"), (NULL));
2923 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
2924 /* for fatal errors we post an error message, wrong-state is
2925 * not fatal because it happens due to flushes and only means
2926 * that we should stop now. */
2927 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2928 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
2932 /* newsegment before eos */
2933 if (parse->priv->pending_segment) {
2934 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
2935 parse->priv->pending_segment = NULL;
2937 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
2939 gst_object_unref (parse);
2944 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
2946 GstBaseParse *parse;
2947 gboolean result = TRUE;
2951 parse = GST_BASE_PARSE (parent);
2953 GST_DEBUG_OBJECT (parse, "sink activate");
2955 query = gst_query_new_scheduling ();
2956 result = gst_pad_peer_query (sinkpad, query);
2958 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL);
2962 gst_query_unref (query);
2965 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
2966 result = gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE);
2968 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
2969 result = gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
2972 GST_DEBUG_OBJECT (parse, "sink activate return %d", result);
2977 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
2979 GstBaseParseClass *klass;
2980 gboolean result = TRUE;
2982 GST_DEBUG_OBJECT (parse, "activate %d", active);
2984 klass = GST_BASE_PARSE_GET_CLASS (parse);
2987 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
2988 result = klass->start (parse);
2990 /* If the subclass implements ::detect we want to
2991 * call it for the first buffers now */
2992 parse->priv->detecting = (klass->detect != NULL);
2994 /* We must make sure streaming has finished before resetting things
2995 * and calling the ::stop vfunc */
2996 GST_PAD_STREAM_LOCK (parse->sinkpad);
2997 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
2999 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
3000 result = klass->stop (parse);
3002 parse->priv->pad_mode = GST_PAD_MODE_NONE;
3004 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
3009 gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
3010 GstPadMode mode, gboolean active)
3012 gboolean result = TRUE;
3013 GstBaseParse *parse;
3015 parse = GST_BASE_PARSE (parent);
3017 GST_DEBUG_OBJECT (parse, "sink activate mode %d, %d", mode, active);
3019 result = gst_base_parse_activate (parse, active);
3023 case GST_PAD_MODE_PULL:
3025 parse->priv->pending_segment =
3026 gst_event_new_segment (&parse->segment);
3028 gst_pad_start_task (pad, (GstTaskFunction) gst_base_parse_loop,
3031 result &= gst_pad_stop_task (pad);
3039 parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
3041 GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
3047 * gst_base_parse_set_duration:
3048 * @parse: #GstBaseParse.
3050 * @duration: duration value.
3051 * @interval: how often to update the duration estimate based on bitrate, or 0.
3053 * Sets the duration of the currently playing media. Subclass can use this
3054 * when it is able to determine duration and/or notices a change in the media
3055 * duration. Alternatively, if @interval is non-zero (default), then stream
3056 * duration is determined based on estimated bitrate, and updated every @interval
3062 gst_base_parse_set_duration (GstBaseParse * parse,
3063 GstFormat fmt, gint64 duration, gint interval)
3065 g_return_if_fail (parse != NULL);
3067 if (parse->priv->upstream_has_duration) {
3068 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3072 if (duration != parse->priv->duration) {
3075 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
3076 gst_element_post_message (GST_ELEMENT (parse), m);
3078 /* TODO: what about duration tag? */
3080 parse->priv->duration = duration;
3081 parse->priv->duration_fmt = fmt;
3082 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3083 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3084 if (interval != 0) {
3085 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3089 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3090 parse->priv->update_interval = interval;
3096 * gst_base_parse_set_average_bitrate:
3097 * @parse: #GstBaseParse.
3098 * @bitrate: average bitrate in bits/second
3100 * Optionally sets the average bitrate detected in media (if non-zero),
3101 * e.g. based on metadata, as it will be posted to the application.
3103 * By default, announced average bitrate is estimated. The average bitrate
3104 * is used to estimate the total duration of the stream and to estimate
3105 * a seek position, if there's no index and the format is syncable
3106 * (see gst_base_parse_set_syncable()).
3111 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3113 parse->priv->bitrate = bitrate;
3114 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3118 * gst_base_parse_set_min_frame_size:
3119 * @parse: #GstBaseParse.
3120 * @min_size: Minimum size of the data that this base class should give to
3123 * Subclass can use this function to tell the base class that it needs to
3124 * give at least #min_size buffers.
3129 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3131 g_return_if_fail (parse != NULL);
3133 parse->priv->min_frame_size = min_size;
3134 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3138 * gst_base_parse_set_frame_rate:
3139 * @parse: the #GstBaseParse to set
3140 * @fps_num: frames per second (numerator).
3141 * @fps_den: frames per second (denominator).
3142 * @lead_in: frames needed before a segment for subsequent decode
3143 * @lead_out: frames needed after a segment
3145 * If frames per second is configured, parser can take care of buffer duration
3146 * and timestamping. When performing segment clipping, or seeking to a specific
3147 * location, a corresponding decoder might need an initial @lead_in and a
3148 * following @lead_out number of frames to ensure the desired segment is
3149 * entirely filled upon decoding.
3154 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3155 guint fps_den, guint lead_in, guint lead_out)
3157 g_return_if_fail (parse != NULL);
3159 parse->priv->fps_num = fps_num;
3160 parse->priv->fps_den = fps_den;
3161 if (!fps_num || !fps_den) {
3162 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3164 fps_num = fps_den = 0;
3165 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3166 parse->priv->lead_in = parse->priv->lead_out = 0;
3167 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3169 parse->priv->frame_duration =
3170 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3171 parse->priv->lead_in = lead_in;
3172 parse->priv->lead_out = lead_out;
3173 parse->priv->lead_in_ts =
3174 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3175 parse->priv->lead_out_ts =
3176 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3177 /* aim for about 1.5s to estimate duration */
3178 if (parse->priv->update_interval < 0) {
3179 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3180 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3181 parse->priv->update_interval);
3184 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3185 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3186 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3187 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3188 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3189 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3193 * gst_base_parse_set_has_timing_info:
3194 * @parse: a #GstBaseParse
3195 * @has_timing: whether frames carry timing information
3197 * Set if frames carry timing information which the subclass can (generally)
3198 * parse and provide. In particular, intrinsic (rather than estimated) time
3199 * can be obtained following a seek.
3204 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3206 parse->priv->has_timing_info = has_timing;
3207 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3211 * gst_base_parse_set_syncable:
3212 * @parse: a #GstBaseParse
3213 * @syncable: set if frame starts can be identified
3215 * Set if frame starts can be identified. This is set by default and
3216 * determines whether seeking based on bitrate averages
3217 * is possible for a format/stream.
3222 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3224 parse->priv->syncable = syncable;
3225 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3229 * gst_base_parse_set_passthrough:
3230 * @parse: a #GstBaseParse
3231 * @passthrough: %TRUE if parser should run in passthrough mode
3233 * Set if the nature of the format or configuration does not allow (much)
3234 * parsing, and the parser should operate in passthrough mode (which only
3235 * applies when operating in push mode). That is, incoming buffers are
3236 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3237 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3238 * so subclass can perform as much or as little is appropriate for
3239 * passthrough semantics in @pre_push_frame.
3244 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3246 parse->priv->passthrough = passthrough;
3247 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3251 * gst_base_parse_set_latency:
3252 * @parse: a #GstBaseParse
3253 * @min_latency: minimum parse latency
3254 * @max_latency: maximum parse latency
3256 * Sets the minimum and maximum (which may likely be equal) latency introduced
3257 * by the parsing process. If there is such a latency, which depends on the
3258 * particular parsing of the format, it typically corresponds to 1 frame duration.
3263 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3264 GstClockTime max_latency)
3266 GST_OBJECT_LOCK (parse);
3267 parse->priv->min_latency = min_latency;
3268 parse->priv->max_latency = max_latency;
3269 GST_OBJECT_UNLOCK (parse);
3270 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3271 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3272 GST_TIME_ARGS (max_latency));
3276 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3277 GstClockTime * duration)
3279 gboolean res = FALSE;
3281 g_return_val_if_fail (duration != NULL, FALSE);
3283 *duration = GST_CLOCK_TIME_NONE;
3284 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3285 GST_LOG_OBJECT (parse, "using provided duration");
3286 *duration = parse->priv->duration;
3288 } else if (parse->priv->duration != -1) {
3289 GST_LOG_OBJECT (parse, "converting provided duration");
3290 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3291 parse->priv->duration, format, (gint64 *) duration);
3292 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3293 GST_LOG_OBJECT (parse, "using estimated duration");
3294 *duration = parse->priv->estimated_duration;
3298 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3299 GST_TIME_ARGS (*duration));
3304 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
3306 GstBaseParse *parse;
3307 gboolean res = FALSE;
3309 parse = GST_BASE_PARSE (parent);
3311 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3313 switch (GST_QUERY_TYPE (query)) {
3314 case GST_QUERY_POSITION:
3319 GST_DEBUG_OBJECT (parse, "position query");
3320 gst_query_parse_position (query, &format, NULL);
3322 /* try upstream first */
3323 res = gst_pad_query_default (pad, parent, query);
3325 /* Fall back on interpreting segment */
3326 GST_OBJECT_LOCK (parse);
3327 if (format == GST_FORMAT_BYTES) {
3328 dest_value = parse->priv->offset;
3330 } else if (format == parse->segment.format &&
3331 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
3332 dest_value = gst_segment_to_stream_time (&parse->segment,
3333 parse->segment.format, parse->segment.position);
3336 GST_OBJECT_UNLOCK (parse);
3338 /* no precise result, upstream no idea either, then best estimate */
3339 /* priv->offset is updated in both PUSH/PULL modes */
3340 res = gst_base_parse_convert (parse,
3341 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3344 gst_query_set_position (query, format, dest_value);
3348 case GST_QUERY_DURATION:
3351 GstClockTime duration;
3353 GST_DEBUG_OBJECT (parse, "duration query");
3354 gst_query_parse_duration (query, &format, NULL);
3356 /* consult upstream */
3357 res = gst_pad_query_default (pad, parent, query);
3359 /* otherwise best estimate from us */
3361 res = gst_base_parse_get_duration (parse, format, &duration);
3363 gst_query_set_duration (query, format, duration);
3367 case GST_QUERY_SEEKING:
3370 GstClockTime duration = GST_CLOCK_TIME_NONE;
3371 gboolean seekable = FALSE;
3373 GST_DEBUG_OBJECT (parse, "seeking query");
3374 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3376 /* consult upstream */
3377 res = gst_pad_query_default (pad, parent, query);
3379 /* we may be able to help if in TIME */
3380 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3381 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3382 /* already OK if upstream takes care */
3383 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3385 if (!(res && seekable)) {
3386 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3387 || duration == -1) {
3388 /* seekable if we still have a chance to get duration later on */
3390 parse->priv->upstream_seekable && parse->priv->update_interval;
3392 seekable = parse->priv->upstream_seekable;
3393 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3396 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3402 case GST_QUERY_FORMATS:
3403 gst_query_set_formatsv (query, 3, fmtlist);
3406 case GST_QUERY_CONVERT:
3408 GstFormat src_format, dest_format;
3409 gint64 src_value, dest_value;
3411 gst_query_parse_convert (query, &src_format, &src_value,
3412 &dest_format, &dest_value);
3414 res = gst_base_parse_convert (parse, src_format, src_value,
3415 dest_format, &dest_value);
3417 gst_query_set_convert (query, src_format, src_value,
3418 dest_format, dest_value);
3422 case GST_QUERY_LATENCY:
3424 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3426 GstClockTime min_latency, max_latency;
3428 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3429 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3430 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3431 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3433 GST_OBJECT_LOCK (parse);
3434 /* add our latency */
3435 if (min_latency != -1)
3436 min_latency += parse->priv->min_latency;
3437 if (max_latency != -1)
3438 max_latency += parse->priv->max_latency;
3439 GST_OBJECT_UNLOCK (parse);
3441 gst_query_set_latency (query, live, min_latency, max_latency);
3446 res = gst_pad_query_default (pad, parent, query);
3452 /* scans for a cluster start from @pos,
3453 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3454 static GstFlowReturn
3455 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3456 GstClockTime * time, GstClockTime * duration)
3458 GstBaseParseClass *klass;
3460 gboolean orig_drain, orig_discont;
3461 GstFlowReturn ret = GST_FLOW_OK;
3462 GstBuffer *buf = NULL;
3463 GstBaseParseFrame frame;
3465 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3466 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3467 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3469 klass = GST_BASE_PARSE_GET_CLASS (parse);
3471 *time = GST_CLOCK_TIME_NONE;
3472 *duration = GST_CLOCK_TIME_NONE;
3475 orig_offset = parse->priv->offset;
3476 orig_discont = parse->priv->discont;
3477 orig_drain = parse->priv->drain;
3479 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3480 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3482 gst_base_parse_frame_init (&frame);
3484 /* jump elsewhere and locate next frame */
3485 parse->priv->offset = *pos;
3486 ret = gst_base_parse_scan_frame (parse, klass, &frame, FALSE);
3487 if (ret != GST_FLOW_OK)
3491 GST_LOG_OBJECT (parse,
3492 "peek parsing frame at offset %" G_GUINT64_FORMAT
3493 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
3494 GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET (buf),
3495 gst_buffer_get_size (buf));
3497 /* get offset first, subclass parsing might dump other stuff in there */
3498 *pos = GST_BUFFER_OFFSET (buf);
3499 ret = klass->parse_frame (parse, &frame);
3502 /* but it should provide proper time */
3503 *time = GST_BUFFER_TIMESTAMP (buf);
3504 *duration = GST_BUFFER_DURATION (buf);
3506 gst_base_parse_frame_free (&frame);
3508 GST_LOG_OBJECT (parse,
3509 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3510 GST_TIME_ARGS (*time), *pos);
3514 parse->priv->offset = orig_offset;
3515 parse->priv->discont = orig_discont;
3516 parse->priv->drain = orig_drain;
3521 /* bisect and scan through file for frame starting before @time,
3522 * returns OK and @time/@offset if found, NONE and/or error otherwise
3523 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3524 static GstFlowReturn
3525 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3528 GstFlowReturn ret = GST_FLOW_OK;
3529 gint64 lpos, hpos, newpos;
3530 GstClockTime time, ltime, htime, newtime, dur;
3531 gboolean cont = TRUE;
3532 const GstClockTime tolerance = TARGET_DIFFERENCE;
3533 const guint chunk = 4 * 1024;
3535 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3536 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3538 /* TODO also make keyframe aware if useful some day */
3553 /* do not know at first */
3555 *_time = GST_CLOCK_TIME_NONE;
3557 /* need initial positions; start and end */
3558 lpos = parse->priv->first_frame_offset;
3559 ltime = parse->priv->first_frame_ts;
3560 htime = parse->priv->duration;
3561 hpos = parse->priv->upstream_size;
3563 /* check preconditions are satisfied;
3564 * start and end are needed, except for special case where we scan for
3565 * last frame to determine duration */
3566 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
3567 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3568 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3572 /* shortcut cases */
3575 } else if (time < ltime + tolerance) {
3579 } else if (time >= htime) {
3585 while (htime > ltime && cont) {
3586 GST_LOG_OBJECT (parse,
3587 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3588 GST_TIME_ARGS (ltime));
3589 GST_LOG_OBJECT (parse,
3590 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3591 GST_TIME_ARGS (htime));
3592 if (G_UNLIKELY (time == G_MAXINT64)) {
3594 } else if (G_LIKELY (hpos > lpos)) {
3596 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3599 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3601 /* we check this case once, but not forever, so break loop */
3606 newpos = CLAMP (newpos, lpos, hpos);
3607 GST_LOG_OBJECT (parse,
3608 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3609 GST_TIME_ARGS (time), newpos);
3611 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3612 if (ret == GST_FLOW_EOS) {
3613 /* heuristic HACK */
3614 hpos = MAX (lpos, hpos - chunk);
3616 } else if (ret != GST_FLOW_OK) {
3620 if (newtime == -1 || newpos == -1) {
3621 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3625 if (G_UNLIKELY (time == G_MAXINT64)) {
3628 if (GST_CLOCK_TIME_IS_VALID (dur))
3631 } else if (newtime > time) {
3633 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3635 } else if (newtime + tolerance > time) {
3636 /* close enough undershoot */
3640 } else if (newtime < ltime) {
3641 /* so a position beyond lpos resulted in earlier time than ltime ... */
3642 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3645 /* undershoot too far */
3646 newpos += newpos == lpos ? chunk : 0;
3647 lpos = CLAMP (newpos, lpos, hpos);
3653 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3654 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3659 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3660 gboolean before, GstClockTime * _ts)
3662 gint64 bytes = 0, ts = 0;
3663 GstIndexEntry *entry = NULL;
3665 if (time == GST_CLOCK_TIME_NONE) {
3671 g_static_mutex_lock (&parse->priv->index_lock);
3672 if (parse->priv->index) {
3673 /* Let's check if we have an index entry for that time */
3674 entry = gst_index_get_assoc_entry (parse->priv->index,
3675 parse->priv->index_id,
3676 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3677 GST_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3681 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3682 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3684 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3685 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3686 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3688 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3689 GST_TIME_ARGS (time));
3692 ts = GST_CLOCK_TIME_NONE;
3695 g_static_mutex_unlock (&parse->priv->index_lock);
3704 /* returns TRUE if seek succeeded */
3706 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3711 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3712 gboolean flush, update, res = TRUE, accurate;
3713 gint64 cur, stop, seekpos, seekstop;
3714 GstSegment seeksegment = { 0, };
3715 GstClockTime start_ts;
3717 gst_event_parse_seek (event, &rate, &format, &flags,
3718 &cur_type, &cur, &stop_type, &stop);
3720 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3721 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3722 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3723 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3725 /* no negative rates in push mode */
3726 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
3729 if (cur_type != GST_SEEK_TYPE_SET ||
3730 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3733 /* For any format other than TIME, see if upstream handles
3734 * it directly or fail. For TIME, try upstream, but do it ourselves if
3735 * it fails upstream */
3736 if (format != GST_FORMAT_TIME) {
3737 /* default action delegates to upstream */
3741 gst_event_ref (event);
3742 if ((res = gst_pad_push_event (parse->sinkpad, event))) {
3747 /* get flush flag */
3748 flush = flags & GST_SEEK_FLAG_FLUSH;
3750 /* copy segment, we need this because we still need the old
3751 * segment when we close the current segment. */
3752 gst_segment_copy_into (&parse->segment, &seeksegment);
3754 GST_DEBUG_OBJECT (parse, "configuring seek");
3755 gst_segment_do_seek (&seeksegment, rate, format, flags,
3756 cur_type, cur, stop_type, stop, &update);
3758 /* accurate seeking implies seek tables are used to obtain position,
3759 * and the requested segment is maintained exactly, not adjusted any way */
3760 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3762 /* maybe we can be accurate for (almost) free */
3763 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
3764 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
3765 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3769 GstClockTime startpos = seeksegment.position;
3771 /* accurate requested, so ... seek a bit before target */
3772 if (startpos < parse->priv->lead_in_ts)
3775 startpos -= parse->priv->lead_in_ts;
3776 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3777 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3780 start_ts = seeksegment.position;
3781 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.position,
3782 GST_FORMAT_BYTES, &seekpos))
3783 goto convert_failed;
3784 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3785 GST_FORMAT_BYTES, &seekstop))
3786 goto convert_failed;
3789 GST_DEBUG_OBJECT (parse,
3790 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3792 GST_DEBUG_OBJECT (parse,
3793 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3794 seeksegment.stop, seekstop);
3796 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
3799 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3802 if (parse->srcpad) {
3803 GST_DEBUG_OBJECT (parse, "sending flush start");
3804 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3805 /* unlock upstream pull_range */
3806 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3809 gst_pad_pause_task (parse->sinkpad);
3812 /* we should now be able to grab the streaming thread because we stopped it
3813 * with the above flush/pause code */
3814 GST_PAD_STREAM_LOCK (parse->sinkpad);
3816 /* save current position */
3817 last_stop = parse->segment.position;
3818 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3821 /* now commit to new position */
3823 /* prepare for streaming again */
3825 GST_DEBUG_OBJECT (parse, "sending flush stop");
3826 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop (TRUE));
3827 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop (TRUE));
3828 gst_base_parse_clear_queues (parse);
3830 /* keep track of our position */
3831 seeksegment.base = gst_segment_to_running_time (&seeksegment,
3832 seeksegment.format, parse->segment.position);
3835 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3837 /* store the newsegment event so it can be sent from the streaming thread. */
3838 if (parse->priv->pending_segment)
3839 gst_event_unref (parse->priv->pending_segment);
3841 /* This will be sent later in _loop() */
3842 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
3844 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3845 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3846 ", pos = %" GST_TIME_FORMAT, format,
3847 GST_TIME_ARGS (parse->segment.start),
3848 GST_TIME_ARGS (parse->segment.stop),
3849 GST_TIME_ARGS (parse->segment.start));
3851 /* one last chance in pull mode to stay accurate;
3852 * maybe scan and subclass can find where to go */
3855 GstClockTime ts = seeksegment.position;
3857 gst_base_parse_locate_time (parse, &ts, &scanpos);
3861 /* running collected index now consists of several intervals,
3862 * so optimized check no longer possible */
3863 parse->priv->index_last_valid = FALSE;
3864 parse->priv->index_last_offset = 0;
3865 parse->priv->index_last_ts = 0;
3869 /* mark discont if we are going to stream from another position. */
3870 if (seekpos != parse->priv->offset) {
3871 GST_DEBUG_OBJECT (parse,
3872 "mark DISCONT, we did a seek to another position");
3873 parse->priv->offset = seekpos;
3874 parse->priv->last_offset = seekpos;
3875 parse->priv->seen_keyframe = FALSE;
3876 parse->priv->discont = TRUE;
3877 parse->priv->next_ts = start_ts;
3878 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3879 parse->priv->sync_offset = seekpos;
3880 parse->priv->exact_position = accurate;
3883 /* Start streaming thread if paused */
3884 gst_pad_start_task (parse->sinkpad,
3885 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3887 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3892 GstEvent *new_event;
3893 GstBaseParseSeek *seek;
3894 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
3896 /* The only thing we need to do in PUSH-mode is to send the
3897 seek event (in bytes) to upstream. Segment / flush handling happens
3898 in corresponding src event handlers */
3899 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3900 if (seekstop >= 0 && seekstop <= seekpos)
3902 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
3903 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3905 /* store segment info so its precise details can be reconstructed when
3906 * receiving newsegment;
3907 * this matters for all details when accurate seeking,
3908 * is most useful to preserve NONE stop time otherwise */
3909 seek = g_new0 (GstBaseParseSeek, 1);
3910 seek->segment = seeksegment;
3911 seek->accurate = accurate;
3912 seek->offset = seekpos;
3913 seek->start_ts = start_ts;
3914 GST_OBJECT_LOCK (parse);
3915 /* less optimal, but preserves order */
3916 parse->priv->pending_seeks =
3917 g_slist_append (parse->priv->pending_seeks, seek);
3918 GST_OBJECT_UNLOCK (parse);
3920 res = gst_pad_push_event (parse->sinkpad, new_event);
3923 GST_OBJECT_LOCK (parse);
3924 parse->priv->pending_seeks =
3925 g_slist_remove (parse->priv->pending_seeks, seek);
3926 GST_OBJECT_UNLOCK (parse);
3932 /* handled event is ours to free */
3934 gst_event_unref (event);
3940 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
3946 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
3952 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
3958 /* Checks if bitrates are available from upstream tags so that we don't
3959 * override them later
3962 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
3964 GstTagList *taglist = NULL;
3967 gst_event_parse_tag (event, &taglist);
3969 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
3970 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
3971 parse->priv->post_min_bitrate = FALSE;
3973 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
3974 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
3975 parse->priv->post_avg_bitrate = FALSE;
3977 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
3978 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
3979 parse->priv->post_max_bitrate = FALSE;
3984 gst_base_parse_set_index (GstElement * element, GstIndex * index)
3986 GstBaseParse *parse = GST_BASE_PARSE (element);
3988 g_static_mutex_lock (&parse->priv->index_lock);
3989 if (parse->priv->index)
3990 gst_object_unref (parse->priv->index);
3992 parse->priv->index = gst_object_ref (index);
3993 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
3994 &parse->priv->index_id);
3995 parse->priv->own_index = FALSE;
3997 parse->priv->index = NULL;
3999 g_static_mutex_unlock (&parse->priv->index_lock);
4003 gst_base_parse_get_index (GstElement * element)
4005 GstBaseParse *parse = GST_BASE_PARSE (element);
4006 GstIndex *result = NULL;
4008 g_static_mutex_lock (&parse->priv->index_lock);
4009 if (parse->priv->index)
4010 result = gst_object_ref (parse->priv->index);
4011 g_static_mutex_unlock (&parse->priv->index_lock);
4016 static GstStateChangeReturn
4017 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4019 GstBaseParse *parse;
4020 GstStateChangeReturn result;
4022 parse = GST_BASE_PARSE (element);
4024 switch (transition) {
4025 case GST_STATE_CHANGE_READY_TO_PAUSED:
4026 /* If this is our own index destroy it as the
4027 * old entries might be wrong for the new stream */
4028 g_static_mutex_lock (&parse->priv->index_lock);
4029 if (parse->priv->own_index) {
4030 gst_object_unref (parse->priv->index);
4031 parse->priv->index = NULL;
4032 parse->priv->own_index = FALSE;
4035 /* If no index was created, generate one */
4036 if (G_UNLIKELY (!parse->priv->index)) {
4037 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4039 parse->priv->index = gst_index_factory_make ("memindex");
4040 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4041 &parse->priv->index_id);
4042 parse->priv->own_index = TRUE;
4044 g_static_mutex_unlock (&parse->priv->index_lock);
4050 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4052 switch (transition) {
4053 case GST_STATE_CHANGE_PAUSED_TO_READY:
4054 gst_base_parse_reset (parse);