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 /* FIXME: get rid of old GstIndex code */
209 #include "gstindex.h"
210 #include "gstindex.c"
211 #include "gstmemindex.c"
213 #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
215 #define MIN_FRAMES_TO_POST_BITRATE 10
216 #define TARGET_DIFFERENCE (20 * GST_SECOND)
218 GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
219 #define GST_CAT_DEFAULT gst_base_parse_debug
221 /* Supported formats */
222 static const GstFormat fmtlist[] = {
229 #define GST_BASE_PARSE_GET_PRIVATE(obj) \
230 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
232 struct _GstBaseParsePrivate
239 GstFormat duration_fmt;
240 gint64 estimated_duration;
241 gint64 estimated_drift;
243 guint min_frame_size;
244 gboolean passthrough;
246 gboolean has_timing_info;
247 guint fps_num, fps_den;
248 gint update_interval;
250 guint lead_in, lead_out;
251 GstClockTime lead_in_ts, lead_out_ts;
252 GstClockTime min_latency, max_latency;
260 GstClockTime next_ts;
261 GstClockTime prev_ts;
262 GstClockTime frame_duration;
263 gboolean seen_keyframe;
268 guint64 data_bytecount;
269 guint64 acc_duration;
270 GstClockTime first_frame_ts;
271 gint64 first_frame_offset;
273 gboolean post_min_bitrate;
274 gboolean post_avg_bitrate;
275 gboolean post_max_bitrate;
279 guint posted_avg_bitrate;
281 GList *pending_events;
283 /* frames/buffers that are queued and ready to go on OK */
284 GQueue queued_frames;
288 /* index entry storage, either ours or provided */
294 /* seek table entries only maintained if upstream is BYTE seekable */
295 gboolean upstream_seekable;
296 gboolean upstream_has_duration;
297 gint64 upstream_size;
298 /* minimum distance between two index entries */
299 GstClockTimeDiff idx_interval;
300 /* ts and offset of last entry added */
301 GstClockTime index_last_ts;
302 gint64 index_last_offset;
303 gboolean index_last_valid;
305 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
306 gboolean exact_position;
307 /* seek events are temporarily kept to match them with newsegments */
308 GSList *pending_seeks;
310 /* reverse playback */
311 GSList *buffers_pending;
312 GSList *buffers_queued;
313 GSList *buffers_send;
314 GstClockTime last_ts;
317 /* Newsegment event to be sent after SEEK */
318 GstEvent *pending_segment;
320 /* Segment event that closes the running segment prior to SEEK */
321 GstEvent *close_segment;
323 /* push mode helper frame */
324 GstBaseParseFrame frame;
326 /* TRUE if we're still detecting the format, i.e.
327 * if ::detect() is still called for future buffers */
329 GList *detect_buffers;
330 guint detect_buffers_size;
333 typedef struct _GstBaseParseSeek
338 GstClockTime start_ts;
341 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
342 g_mutex_lock (&parse->priv->index_lock);
343 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
344 g_mutex_unlock (&parse->priv->index_lock);
346 static GstElementClass *parent_class = NULL;
348 static void gst_base_parse_class_init (GstBaseParseClass * klass);
349 static void gst_base_parse_init (GstBaseParse * parse,
350 GstBaseParseClass * klass);
353 gst_base_parse_get_type (void)
355 static volatile gsize base_parse_type = 0;
357 if (g_once_init_enter (&base_parse_type)) {
358 static const GTypeInfo base_parse_info = {
359 sizeof (GstBaseParseClass),
360 (GBaseInitFunc) NULL,
361 (GBaseFinalizeFunc) NULL,
362 (GClassInitFunc) gst_base_parse_class_init,
365 sizeof (GstBaseParse),
367 (GInstanceInitFunc) gst_base_parse_init,
371 _type = g_type_register_static (GST_TYPE_ELEMENT,
372 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
373 g_once_init_leave (&base_parse_type, _type);
375 return (GType) base_parse_type;
378 static void gst_base_parse_finalize (GObject * object);
380 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
381 GstStateChange transition);
382 static void gst_base_parse_reset (GstBaseParse * parse);
385 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
386 static GstIndex *gst_base_parse_get_index (GstElement * element);
389 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
391 static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
392 GstObject * parent, GstPadMode mode, gboolean active);
393 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
395 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
397 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
399 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
402 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
404 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
407 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
409 static void gst_base_parse_loop (GstPad * pad);
411 static gboolean gst_base_parse_check_frame (GstBaseParse * parse,
412 GstBaseParseFrame * frame, guint * framesize, gint * skipsize);
413 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
414 GstBaseParseFrame * frame);
416 static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse,
419 static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse,
422 static void gst_base_parse_drain (GstBaseParse * parse);
424 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
425 gboolean post_min, gboolean post_avg, gboolean post_max);
427 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
428 GstClockTime time, gboolean before, GstClockTime * _ts);
429 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
430 GstClockTime * _time, gint64 * _offset);
432 static GstFlowReturn gst_base_parse_process_fragment (GstBaseParse * parse,
435 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
438 gst_base_parse_clear_queues (GstBaseParse * parse)
440 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
441 g_slist_free (parse->priv->buffers_queued);
442 parse->priv->buffers_queued = NULL;
443 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
445 g_slist_free (parse->priv->buffers_pending);
446 parse->priv->buffers_pending = NULL;
447 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
448 g_slist_free (parse->priv->buffers_send);
449 parse->priv->buffers_send = NULL;
451 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
452 g_list_free (parse->priv->detect_buffers);
453 parse->priv->detect_buffers = NULL;
454 parse->priv->detect_buffers_size = 0;
456 g_queue_foreach (&parse->priv->queued_frames,
457 (GFunc) gst_base_parse_frame_free, NULL);
458 g_queue_clear (&parse->priv->queued_frames);
462 gst_base_parse_finalize (GObject * object)
464 GstBaseParse *parse = GST_BASE_PARSE (object);
467 g_object_unref (parse->priv->adapter);
469 if (parse->priv->pending_segment) {
470 p_ev = &parse->priv->pending_segment;
471 gst_event_replace (p_ev, NULL);
473 if (parse->priv->close_segment) {
474 p_ev = &parse->priv->close_segment;
475 gst_event_replace (p_ev, NULL);
478 if (parse->priv->cache) {
479 gst_buffer_unref (parse->priv->cache);
480 parse->priv->cache = NULL;
483 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
485 g_list_free (parse->priv->pending_events);
486 parse->priv->pending_events = NULL;
488 if (parse->priv->index) {
489 gst_object_unref (parse->priv->index);
490 parse->priv->index = NULL;
492 g_mutex_clear (&parse->priv->index_lock);
494 gst_base_parse_clear_queues (parse);
496 G_OBJECT_CLASS (parent_class)->finalize (object);
500 gst_base_parse_class_init (GstBaseParseClass * klass)
502 GObjectClass *gobject_class;
503 GstElementClass *gstelement_class;
505 gobject_class = G_OBJECT_CLASS (klass);
506 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
507 parent_class = g_type_class_peek_parent (klass);
508 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
510 gstelement_class = (GstElementClass *) klass;
511 gstelement_class->change_state =
512 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
515 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
516 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
519 /* Default handlers */
520 klass->check_valid_frame = gst_base_parse_check_frame;
521 klass->parse_frame = gst_base_parse_parse_frame;
522 klass->src_event = gst_base_parse_src_eventfunc;
523 klass->convert = gst_base_parse_convert_default;
525 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
526 "baseparse element");
530 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
532 GstPadTemplate *pad_template;
534 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
536 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
539 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
540 g_return_if_fail (pad_template != NULL);
541 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
542 gst_pad_set_event_function (parse->sinkpad,
543 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
544 gst_pad_set_query_function (parse->sinkpad,
545 GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
546 gst_pad_set_chain_function (parse->sinkpad,
547 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
548 gst_pad_set_activate_function (parse->sinkpad,
549 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
550 gst_pad_set_activatemode_function (parse->sinkpad,
551 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
552 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
554 GST_DEBUG_OBJECT (parse, "sinkpad created");
557 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
558 g_return_if_fail (pad_template != NULL);
559 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
560 gst_pad_set_event_function (parse->srcpad,
561 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
562 gst_pad_set_query_function (parse->srcpad,
563 GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
564 gst_pad_use_fixed_caps (parse->srcpad);
565 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
566 GST_DEBUG_OBJECT (parse, "src created");
568 g_queue_init (&parse->priv->queued_frames);
570 parse->priv->adapter = gst_adapter_new ();
572 parse->priv->pad_mode = GST_PAD_MODE_NONE;
574 g_mutex_init (&parse->priv->index_lock);
577 gst_base_parse_reset (parse);
578 GST_DEBUG_OBJECT (parse, "init ok");
580 GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE);
583 static GstBaseParseFrame *
584 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
586 GstBaseParseFrame *copy;
588 copy = g_slice_dup (GstBaseParseFrame, frame);
589 copy->buffer = gst_buffer_ref (frame->buffer);
590 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
592 GST_TRACE ("copied frame %p -> %p", frame, copy);
598 gst_base_parse_frame_free (GstBaseParseFrame * frame)
600 GST_TRACE ("freeing frame %p", frame);
603 gst_buffer_unref (frame->buffer);
604 frame->buffer = NULL;
607 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
608 g_slice_free (GstBaseParseFrame, frame);
610 memset (frame, 0, sizeof (*frame));
615 gst_base_parse_frame_get_type (void)
617 static volatile gsize frame_type = 0;
619 if (g_once_init_enter (&frame_type)) {
622 _type = g_boxed_type_register_static ("GstBaseParseFrame",
623 (GBoxedCopyFunc) gst_base_parse_frame_copy,
624 (GBoxedFreeFunc) gst_base_parse_frame_free);
625 g_once_init_leave (&frame_type, _type);
627 return (GType) frame_type;
631 * gst_base_parse_frame_init:
632 * @frame: #GstBaseParseFrame.
634 * Sets a #GstBaseParseFrame to initial state. Currently this means
635 * all public fields are zero-ed and a private flag is set to make
636 * sure gst_base_parse_frame_free() only frees the contents but not
637 * the actual frame. Use this function to initialise a #GstBaseParseFrame
638 * allocated on the stack.
643 gst_base_parse_frame_init (GstBaseParseFrame * frame)
645 memset (frame, 0, sizeof (GstBaseParseFrame));
646 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
647 GST_TRACE ("inited frame %p", frame);
651 * gst_base_parse_frame_new:
652 * @buffer: (transfer none): a #GstBuffer
654 * @overhead: number of bytes in this frame which should be counted as
655 * metadata overhead, ie. not used to calculate the average bitrate.
656 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
658 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
659 * elements written in C should usually allocate the frame on the stack and
660 * then use gst_base_parse_frame_init() to initialise it.
662 * Returns: a newly-allocated #GstBaseParseFrame. Free with
663 * gst_base_parse_frame_free() when no longer needed, unless you gave
664 * away ownership to gst_base_parse_push_frame().
669 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
672 GstBaseParseFrame *frame;
674 frame = g_slice_new0 (GstBaseParseFrame);
675 frame->buffer = gst_buffer_ref (buffer);
677 GST_TRACE ("created frame %p", frame);
682 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
685 gst_buffer_replace (&frame->buffer, buf);
689 /* set flags one by one for clarity */
690 if (G_UNLIKELY (parse->priv->drain))
691 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
693 /* losing sync is pretty much a discont (and vice versa), no ? */
694 if (G_UNLIKELY (parse->priv->discont))
695 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
699 gst_base_parse_reset (GstBaseParse * parse)
701 GST_OBJECT_LOCK (parse);
702 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
703 parse->priv->duration = -1;
704 parse->priv->min_frame_size = 1;
705 parse->priv->discont = TRUE;
706 parse->priv->flushing = FALSE;
707 parse->priv->offset = 0;
708 parse->priv->sync_offset = 0;
709 parse->priv->update_interval = -1;
710 parse->priv->fps_num = parse->priv->fps_den = 0;
711 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
712 parse->priv->lead_in = parse->priv->lead_out = 0;
713 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
714 parse->priv->bitrate = 0;
715 parse->priv->framecount = 0;
716 parse->priv->bytecount = 0;
717 parse->priv->acc_duration = 0;
718 parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE;
719 parse->priv->first_frame_offset = -1;
720 parse->priv->estimated_duration = -1;
721 parse->priv->estimated_drift = 0;
722 parse->priv->next_ts = 0;
723 parse->priv->syncable = TRUE;
724 parse->priv->passthrough = FALSE;
725 parse->priv->has_timing_info = FALSE;
726 parse->priv->post_min_bitrate = TRUE;
727 parse->priv->post_avg_bitrate = TRUE;
728 parse->priv->post_max_bitrate = TRUE;
729 parse->priv->min_bitrate = G_MAXUINT;
730 parse->priv->max_bitrate = 0;
731 parse->priv->avg_bitrate = 0;
732 parse->priv->posted_avg_bitrate = 0;
734 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
735 parse->priv->index_last_offset = -1;
736 parse->priv->index_last_valid = TRUE;
737 parse->priv->upstream_seekable = FALSE;
738 parse->priv->upstream_size = 0;
739 parse->priv->upstream_has_duration = FALSE;
740 parse->priv->idx_interval = 0;
741 parse->priv->exact_position = TRUE;
742 parse->priv->seen_keyframe = FALSE;
744 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
745 parse->priv->last_offset = 0;
747 if (parse->priv->pending_segment) {
748 gst_event_unref (parse->priv->pending_segment);
749 parse->priv->pending_segment = NULL;
752 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
754 g_list_free (parse->priv->pending_events);
755 parse->priv->pending_events = NULL;
757 if (parse->priv->cache) {
758 gst_buffer_unref (parse->priv->cache);
759 parse->priv->cache = NULL;
762 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
763 g_slist_free (parse->priv->pending_seeks);
764 parse->priv->pending_seeks = NULL;
766 if (parse->priv->adapter)
767 gst_adapter_clear (parse->priv->adapter);
769 /* we know it is not alloc'ed, but maybe other stuff to free, some day ... */
770 parse->priv->frame._private_flags |=
771 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
772 gst_base_parse_frame_free (&parse->priv->frame);
774 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
775 g_list_free (parse->priv->detect_buffers);
776 parse->priv->detect_buffers = NULL;
777 parse->priv->detect_buffers_size = 0;
778 GST_OBJECT_UNLOCK (parse);
781 /* gst_base_parse_check_frame:
782 * @parse: #GstBaseParse.
783 * @buffer: GstBuffer.
784 * @framesize: This will be set to tell the found frame size in bytes.
785 * @skipsize: Output parameter that tells how much data needs to be skipped
786 * in order to find the following frame header.
788 * Default callback for check_valid_frame.
790 * Returns: Always TRUE.
793 gst_base_parse_check_frame (GstBaseParse * parse,
794 GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
796 *framesize = gst_buffer_get_size (frame->buffer);
802 /* gst_base_parse_parse_frame:
803 * @parse: #GstBaseParse.
804 * @buffer: #GstBuffer.
806 * Default callback for parse_frame.
809 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
811 GstBuffer *buffer = frame->buffer;
813 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
814 GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) {
815 GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts;
817 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
818 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
819 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
824 /* gst_base_parse_convert:
825 * @parse: #GstBaseParse.
826 * @src_format: #GstFormat describing the source format.
827 * @src_value: Source value to be converted.
828 * @dest_format: #GstFormat defining the converted format.
829 * @dest_value: Pointer where the conversion result will be put.
831 * Converts using configured "convert" vmethod in #GstBaseParse class.
833 * Returns: TRUE if conversion was successful.
836 gst_base_parse_convert (GstBaseParse * parse,
837 GstFormat src_format,
838 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
840 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
843 g_return_val_if_fail (dest_value != NULL, FALSE);
848 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
850 #ifndef GST_DISABLE_GST_DEBUG
853 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
854 GST_LOG_OBJECT (parse,
855 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
856 GST_TIME_ARGS (src_value), *dest_value);
857 } else if (dest_format == GST_FORMAT_TIME &&
858 src_format == GST_FORMAT_BYTES) {
859 GST_LOG_OBJECT (parse,
860 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
861 src_value, GST_TIME_ARGS (*dest_value));
863 GST_LOG_OBJECT (parse,
864 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
865 GST_STR_NULL (gst_format_get_name (src_format)),
866 GST_STR_NULL (gst_format_get_name (dest_format)),
867 src_value, *dest_value);
870 GST_DEBUG_OBJECT (parse, "conversion failed");
878 /* gst_base_parse_sink_event:
879 * @pad: #GstPad that received the event.
880 * @event: #GstEvent to be handled.
882 * Handler for sink pad events.
884 * Returns: TRUE if the event was handled.
887 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
890 GstBaseParseClass *bclass;
891 gboolean handled = FALSE;
894 parse = GST_BASE_PARSE (parent);
895 bclass = GST_BASE_PARSE_GET_CLASS (parse);
897 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
898 GST_EVENT_TYPE_NAME (event));
900 /* Cache all events except EOS, SEGMENT and FLUSH_STOP if we have a
902 if (parse->priv->pending_segment && GST_EVENT_TYPE (event) != GST_EVENT_EOS
903 && GST_EVENT_TYPE (event) != GST_EVENT_SEGMENT
904 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
905 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP
906 && GST_EVENT_TYPE (event) != GST_EVENT_CAPS) {
908 if (GST_EVENT_TYPE (event) == GST_EVENT_TAG)
909 /* See if any bitrate tags were posted */
910 gst_base_parse_handle_tag (parse, event);
912 parse->priv->pending_events =
913 g_list_append (parse->priv->pending_events, event);
917 if (GST_EVENT_TYPE (event) == GST_EVENT_EOS &&
918 parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
919 /* We've not posted bitrate tags yet - do so now */
920 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
923 handled = bclass->event (parse, event);
926 handled = gst_base_parse_sink_eventfunc (parse, event);
929 ret = gst_pad_event_default (pad, parent, event);
932 GST_DEBUG_OBJECT (parse, "event handled");
938 /* gst_base_parse_sink_eventfunc:
939 * @parse: #GstBaseParse.
940 * @event: #GstEvent to be handled.
942 * Element-level event handler function.
944 * The event will be unreffed only if it has been handled and this
945 * function returns %TRUE
947 * Returns: %TRUE if the event was handled and not need forwarding.
950 gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event)
952 gboolean handled = FALSE;
955 switch (GST_EVENT_TYPE (event)) {
959 GstBaseParseClass *klass;
961 klass = GST_BASE_PARSE_GET_CLASS (parse);
963 gst_event_parse_caps (event, &caps);
964 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
966 if (klass->set_sink_caps)
967 klass->set_sink_caps (parse, caps);
969 /* will send our own caps downstream */
970 gst_event_unref (event);
974 case GST_EVENT_SEGMENT:
976 const GstSegment *in_segment;
977 GstSegment out_segment;
978 gint64 offset = 0, next_ts;
981 gdouble rate, applied_rate;
983 gint64 start, stop, pos, next_ts;
987 gst_event_parse_segment (event, &in_segment);
988 gst_segment_init (&out_segment, GST_FORMAT_TIME);
990 GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
992 if (in_segment->format == GST_FORMAT_BYTES) {
993 GstBaseParseSeek *seek = NULL;
996 /* stop time is allowed to be open-ended, but not start & pos */
997 offset = in_segment->time;
999 GST_OBJECT_LOCK (parse);
1000 for (node = parse->priv->pending_seeks; node; node = node->next) {
1001 GstBaseParseSeek *tmp = node->data;
1003 if (tmp->offset == offset) {
1008 parse->priv->pending_seeks =
1009 g_slist_remove (parse->priv->pending_seeks, seek);
1010 GST_OBJECT_UNLOCK (parse);
1013 GST_DEBUG_OBJECT (parse,
1014 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
1015 seek->accurate ? " accurate" : "", &seek->segment);
1017 out_segment.start = seek->segment.start;
1018 out_segment.stop = seek->segment.stop;
1019 out_segment.time = seek->segment.start;
1021 next_ts = seek->start_ts;
1022 parse->priv->exact_position = seek->accurate;
1025 /* best attempt convert */
1026 /* as these are only estimates, stop is kept open-ended to avoid
1027 * premature cutting */
1028 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
1029 GST_FORMAT_TIME, (gint64 *) & next_ts);
1031 out_segment.start = next_ts;
1032 out_segment.stop = GST_CLOCK_TIME_NONE;
1033 out_segment.time = next_ts;
1035 parse->priv->exact_position = (in_segment->start == 0);
1038 gst_event_unref (event);
1040 event = gst_event_new_segment (&out_segment);
1042 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1043 GST_SEGMENT_FORMAT, in_segment);
1045 } else if (in_segment->format != GST_FORMAT_TIME) {
1046 /* Unknown incoming segment format. Output a default open-ended
1048 gst_event_unref (event);
1050 out_segment.start = 0;
1051 out_segment.stop = GST_CLOCK_TIME_NONE;;
1052 out_segment.time = 0;;
1054 event = gst_event_new_segment (&out_segment);
1058 /* not considered BYTE seekable if it is talking to us in TIME,
1059 * whatever else it might claim */
1060 parse->priv->upstream_seekable = FALSE;
1061 next_ts = in_segment->start;
1064 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1067 gst_segment_set_newsegment (&parse->segment, update, rate,
1068 applied_rate, format, start, stop, start);
1071 /* save the segment for later, right before we push a new buffer so that
1072 * the caps are fixed and the next linked element can receive
1074 eventp = &parse->priv->pending_segment;
1075 gst_event_replace (eventp, event);
1076 gst_event_unref (event);
1079 /* but finish the current segment */
1080 GST_DEBUG_OBJECT (parse, "draining current segment");
1081 if (in_segment->rate > 0.0)
1082 gst_base_parse_drain (parse);
1084 gst_base_parse_process_fragment (parse, FALSE);
1085 gst_adapter_clear (parse->priv->adapter);
1087 parse->priv->offset = offset;
1088 parse->priv->sync_offset = offset;
1089 parse->priv->next_ts = next_ts;
1090 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1091 parse->priv->discont = TRUE;
1092 parse->priv->seen_keyframe = FALSE;
1096 case GST_EVENT_FLUSH_START:
1097 parse->priv->flushing = TRUE;
1098 handled = gst_pad_push_event (parse->srcpad, gst_event_ref (event));
1100 gst_event_unref (event);
1101 /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
1102 GST_PAD_STREAM_LOCK (parse->srcpad);
1103 GST_PAD_STREAM_UNLOCK (parse->srcpad);
1107 case GST_EVENT_FLUSH_STOP:
1108 gst_adapter_clear (parse->priv->adapter);
1109 gst_base_parse_clear_queues (parse);
1110 parse->priv->flushing = FALSE;
1111 parse->priv->discont = TRUE;
1112 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1113 parse->priv->frame._private_flags |=
1114 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
1115 gst_base_parse_frame_free (&parse->priv->frame);
1119 if (parse->segment.rate > 0.0)
1120 gst_base_parse_drain (parse);
1122 gst_base_parse_process_fragment (parse, FALSE);
1124 /* If we STILL have zero frames processed, fire an error */
1125 if (parse->priv->framecount == 0) {
1126 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1127 ("No valid frames found before end of stream"), (NULL));
1129 /* newsegment before eos */
1130 if (parse->priv->pending_segment) {
1131 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
1132 parse->priv->pending_segment = NULL;
1144 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1146 GstBaseParse *parse;
1147 GstBaseParseClass *bclass;
1150 parse = GST_BASE_PARSE (parent);
1151 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1153 switch (GST_QUERY_TYPE (query)) {
1154 case GST_QUERY_CAPS:
1156 if (bclass->get_sink_caps) {
1157 GstCaps *caps, *filter;
1159 gst_query_parse_caps (query, &filter);
1160 caps = bclass->get_sink_caps (parse, filter);
1161 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1163 gst_query_set_caps_result (query, caps);
1164 gst_caps_unref (caps);
1168 GstCaps *caps, *template_caps, *filter;
1170 gst_query_parse_caps (query, &filter);
1171 template_caps = gst_pad_get_pad_template_caps (pad);
1172 if (filter != NULL) {
1174 gst_caps_intersect_full (filter, template_caps,
1175 GST_CAPS_INTERSECT_FIRST);
1177 caps = gst_caps_copy (template_caps);
1179 gst_query_set_caps_result (query, caps);
1180 gst_caps_unref (caps);
1188 res = gst_pad_query_default (pad, parent, query);
1197 /* gst_base_parse_src_event:
1198 * @pad: #GstPad that received the event.
1199 * @event: #GstEvent that was received.
1201 * Handler for source pad events.
1203 * Returns: TRUE if the event was handled.
1206 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1208 GstBaseParse *parse;
1209 GstBaseParseClass *bclass;
1210 gboolean handled = FALSE;
1211 gboolean ret = TRUE;
1213 parse = GST_BASE_PARSE (parent);
1214 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1216 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1217 GST_EVENT_TYPE_NAME (event));
1219 if (bclass->src_event)
1220 handled = bclass->src_event (parse, event);
1223 ret = gst_pad_event_default (pad, parent, event);
1229 gst_base_parse_is_seekable (GstBaseParse * parse)
1231 /* FIXME: could do more here, e.g. check index or just send data from 0
1232 * in pull mode and let decoder/sink clip */
1233 return parse->priv->syncable;
1236 /* gst_base_parse_src_eventfunc:
1237 * @parse: #GstBaseParse.
1238 * @event: #GstEvent that was received.
1240 * Default srcpad event handler.
1242 * Returns: TRUE if the event was handled and can be dropped.
1245 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1247 gboolean handled = FALSE;
1249 switch (GST_EVENT_TYPE (event)) {
1250 case GST_EVENT_SEEK:
1252 if (gst_base_parse_is_seekable (parse)) {
1253 handled = gst_base_parse_handle_seek (parse, event);
1265 * gst_base_parse_convert_default:
1266 * @parse: #GstBaseParse.
1267 * @src_format: #GstFormat describing the source format.
1268 * @src_value: Source value to be converted.
1269 * @dest_format: #GstFormat defining the converted format.
1270 * @dest_value: Pointer where the conversion result will be put.
1272 * Default implementation of "convert" vmethod in #GstBaseParse class.
1274 * Returns: TRUE if conversion was successful.
1279 gst_base_parse_convert_default (GstBaseParse * parse,
1280 GstFormat src_format,
1281 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1283 gboolean ret = FALSE;
1284 guint64 bytes, duration;
1286 if (G_UNLIKELY (src_format == dest_format)) {
1287 *dest_value = src_value;
1291 if (G_UNLIKELY (src_value == -1)) {
1296 if (G_UNLIKELY (src_value == 0)) {
1301 /* need at least some frames */
1302 if (!parse->priv->framecount)
1305 duration = parse->priv->acc_duration / GST_MSECOND;
1306 bytes = parse->priv->bytecount;
1308 if (G_UNLIKELY (!duration || !bytes))
1311 if (src_format == GST_FORMAT_BYTES) {
1312 if (dest_format == GST_FORMAT_TIME) {
1313 /* BYTES -> TIME conversion */
1314 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1315 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1316 *dest_value *= GST_MSECOND;
1317 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1318 *dest_value / GST_MSECOND);
1321 } else if (src_format == GST_FORMAT_TIME) {
1322 if (dest_format == GST_FORMAT_BYTES) {
1323 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1324 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1326 GST_DEBUG_OBJECT (parse,
1327 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1328 src_value / GST_MSECOND, *dest_value);
1331 } else if (src_format == GST_FORMAT_DEFAULT) {
1332 /* DEFAULT == frame-based */
1333 if (dest_format == GST_FORMAT_TIME) {
1334 if (parse->priv->fps_den) {
1335 *dest_value = gst_util_uint64_scale (src_value,
1336 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1339 } else if (dest_format == GST_FORMAT_BYTES) {
1347 gst_base_parse_update_duration (GstBaseParse * baseparse)
1350 GstBaseParse *parse;
1352 parse = GST_BASE_PARSE (baseparse);
1354 peer = gst_pad_get_peer (parse->sinkpad);
1356 gboolean qres = FALSE;
1357 gint64 ptot, dest_value;
1359 qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot);
1360 gst_object_unref (GST_OBJECT (peer));
1362 if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1363 GST_FORMAT_TIME, &dest_value)) {
1365 /* inform if duration changed, but try to avoid spamming */
1366 parse->priv->estimated_drift +=
1367 dest_value - parse->priv->estimated_duration;
1368 if (parse->priv->estimated_drift > GST_SECOND ||
1369 parse->priv->estimated_drift < -GST_SECOND) {
1370 gst_element_post_message (GST_ELEMENT (parse),
1371 gst_message_new_duration (GST_OBJECT (parse),
1372 GST_FORMAT_TIME, dest_value));
1373 parse->priv->estimated_drift = 0;
1375 parse->priv->estimated_duration = dest_value;
1376 GST_LOG_OBJECT (parse,
1377 "updated estimated duration to %" GST_TIME_FORMAT,
1378 GST_TIME_ARGS (dest_value));
1385 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1386 gboolean post_avg, gboolean post_max)
1388 GstTagList *taglist = NULL;
1390 if (post_min && parse->priv->post_min_bitrate) {
1391 taglist = gst_tag_list_new_empty ();
1393 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1394 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1397 if (post_avg && parse->priv->post_avg_bitrate) {
1398 if (taglist == NULL)
1399 taglist = gst_tag_list_new_empty ();
1401 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1402 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1403 parse->priv->avg_bitrate, NULL);
1406 if (post_max && parse->priv->post_max_bitrate) {
1407 if (taglist == NULL)
1408 taglist = gst_tag_list_new_empty ();
1410 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1411 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1414 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1415 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1416 parse->priv->max_bitrate);
1418 if (taglist != NULL) {
1419 gst_pad_push_event (parse->srcpad, gst_event_new_tag (taglist));
1423 /* gst_base_parse_update_bitrates:
1424 * @parse: #GstBaseParse.
1425 * @buffer: Current frame as a #GstBuffer
1427 * Keeps track of the minimum and maximum bitrates, and also maintains a
1428 * running average bitrate of the stream so far.
1431 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1433 /* Only update the tag on a 10 kbps delta */
1434 static const gint update_threshold = 10000;
1436 guint64 data_len, frame_dur;
1437 gint overhead, frame_bitrate, old_avg_bitrate;
1438 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1439 GstBuffer *buffer = frame->buffer;
1441 overhead = frame->overhead;
1445 data_len = gst_buffer_get_size (buffer) - overhead;
1446 parse->priv->data_bytecount += data_len;
1448 /* duration should be valid by now,
1449 * either set by subclass or maybe based on fps settings */
1450 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1451 /* Calculate duration of a frame from buffer properties */
1452 frame_dur = GST_BUFFER_DURATION (buffer);
1453 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1454 parse->priv->acc_duration;
1457 /* No way to figure out frame duration (is this even possible?) */
1461 /* override if subclass provided bitrate, e.g. metadata based */
1462 if (parse->priv->bitrate) {
1463 parse->priv->avg_bitrate = parse->priv->bitrate;
1464 /* spread this (confirmed) info ASAP */
1465 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1466 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1470 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1474 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1475 parse->priv->avg_bitrate);
1477 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1479 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1480 /* always post all at threshold time */
1481 update_min = update_max = update_avg = TRUE;
1484 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1485 if (frame_bitrate < parse->priv->min_bitrate) {
1486 parse->priv->min_bitrate = frame_bitrate;
1490 if (frame_bitrate > parse->priv->max_bitrate) {
1491 parse->priv->max_bitrate = frame_bitrate;
1495 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1496 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1497 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1502 if ((update_min || update_avg || update_max))
1503 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1505 /* If average bitrate changes that much and no valid (time) duration provided,
1506 * then post a new duration message so applications can update their cached
1508 if (update_avg && !(parse->priv->duration_fmt == GST_FORMAT_TIME &&
1509 GST_CLOCK_TIME_IS_VALID (parse->priv->duration)))
1510 gst_element_post_message (GST_ELEMENT (parse),
1511 gst_message_new_duration (GST_OBJECT (parse), GST_FORMAT_TIME, -1));
1518 * gst_base_parse_add_index_entry:
1519 * @parse: #GstBaseParse.
1520 * @offset: offset of entry
1521 * @ts: timestamp associated with offset
1522 * @key: whether entry refers to keyframe
1523 * @force: add entry disregarding sanity checks
1525 * Adds an entry to the index associating @offset to @ts. It is recommended
1526 * to only add keyframe entries. @force allows to bypass checks, such as
1527 * whether the stream is (upstream) seekable, another entry is already "close"
1528 * to the new entry, etc.
1530 * Returns: #gboolean indicating whether entry was added
1535 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1536 GstClockTime ts, gboolean key, gboolean force)
1538 gboolean ret = FALSE;
1539 GstIndexAssociation associations[2];
1541 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1542 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1544 if (G_LIKELY (!force)) {
1546 if (!parse->priv->upstream_seekable) {
1547 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1551 /* FIXME need better helper data structure that handles these issues
1552 * related to ongoing collecting of index entries */
1553 if (parse->priv->index_last_offset >= (gint64) offset) {
1554 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1555 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1559 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1560 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1561 parse->priv->idx_interval) {
1562 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1563 GST_TIME_ARGS (parse->priv->index_last_ts));
1567 /* if last is not really the last one */
1568 if (!parse->priv->index_last_valid) {
1569 GstClockTime prev_ts;
1571 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1572 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1573 GST_DEBUG_OBJECT (parse,
1574 "entry too close to existing entry %" GST_TIME_FORMAT,
1575 GST_TIME_ARGS (prev_ts));
1576 parse->priv->index_last_offset = offset;
1577 parse->priv->index_last_ts = ts;
1583 associations[0].format = GST_FORMAT_TIME;
1584 associations[0].value = ts;
1585 associations[1].format = GST_FORMAT_BYTES;
1586 associations[1].value = offset;
1588 /* index might change on-the-fly, although that would be nutty app ... */
1589 GST_BASE_PARSE_INDEX_LOCK (parse);
1590 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1591 (key) ? GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT :
1592 GST_INDEX_ASSOCIATION_FLAG_DELTA_UNIT, 2,
1593 (const GstIndexAssociation *) &associations);
1594 GST_BASE_PARSE_INDEX_UNLOCK (parse);
1597 parse->priv->index_last_offset = offset;
1598 parse->priv->index_last_ts = ts;
1607 /* check for seekable upstream, above and beyond a mere query */
1609 gst_base_parse_check_seekability (GstBaseParse * parse)
1612 gboolean seekable = FALSE;
1613 gint64 start = -1, stop = -1;
1614 guint idx_interval = 0;
1616 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1617 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1618 GST_DEBUG_OBJECT (parse, "seeking query failed");
1622 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1624 /* try harder to query upstream size if we didn't get it the first time */
1625 if (seekable && stop == -1) {
1626 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1627 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1630 /* if upstream doesn't know the size, it's likely that it's not seekable in
1631 * practice even if it technically may be seekable */
1632 if (seekable && (start != 0 || stop <= start)) {
1633 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1637 /* let's not put every single frame into our index */
1639 if (stop < 10 * 1024 * 1024)
1641 else if (stop < 100 * 1024 * 1024)
1644 idx_interval = 1000;
1648 gst_query_unref (query);
1650 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1651 G_GUINT64_FORMAT ")", seekable, start, stop);
1652 parse->priv->upstream_seekable = seekable;
1653 parse->priv->upstream_size = seekable ? stop : 0;
1655 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1656 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1659 /* some misc checks on upstream */
1661 gst_base_parse_check_upstream (GstBaseParse * parse)
1665 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
1666 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1667 /* upstream has one, accept it also, and no further updates */
1668 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1669 parse->priv->upstream_has_duration = TRUE;
1672 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1673 parse->priv->upstream_has_duration);
1676 /* checks src caps to determine if dealing with audio or video */
1677 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1679 gst_base_parse_check_media (GstBaseParse * parse)
1684 caps = gst_pad_get_current_caps (parse->srcpad);
1685 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1686 parse->priv->is_video =
1687 g_str_has_prefix (gst_structure_get_name (s), "video");
1689 /* historical default */
1690 parse->priv->is_video = FALSE;
1693 gst_caps_unref (caps);
1695 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1698 /* takes ownership of frame */
1700 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1702 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1703 /* frame allocated on the heap, we can just take ownership */
1704 g_queue_push_tail (&parse->priv->queued_frames, frame);
1705 GST_TRACE ("queued frame %p", frame);
1707 GstBaseParseFrame *copy;
1709 /* probably allocated on the stack, must make a proper copy */
1710 copy = gst_base_parse_frame_copy (frame);
1711 g_queue_push_tail (&parse->priv->queued_frames, copy);
1712 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1713 gst_base_parse_frame_free (frame);
1717 /* gst_base_parse_handle_and_push_buffer:
1718 * @parse: #GstBaseParse.
1719 * @klass: #GstBaseParseClass.
1720 * @frame: (transfer full): a #GstBaseParseFrame
1722 * Parses the frame from given buffer and pushes it forward. Also performs
1723 * timestamp handling and checks the segment limits.
1725 * This is called with srcpad STREAM_LOCK held.
1727 * Returns: #GstFlowReturn
1729 static GstFlowReturn
1730 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1731 GstBaseParseClass * klass, GstBaseParseFrame * frame)
1737 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1739 buffer = frame->buffer;
1741 if (parse->priv->discont) {
1742 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1743 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1744 parse->priv->discont = FALSE;
1747 /* some one-time start-up */
1748 if (G_UNLIKELY (!parse->priv->framecount)) {
1749 gst_base_parse_check_seekability (parse);
1750 gst_base_parse_check_upstream (parse);
1753 GST_LOG_OBJECT (parse,
1754 "parsing frame at offset %" G_GUINT64_FORMAT
1755 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
1756 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1757 gst_buffer_get_size (buffer));
1759 /* use default handler to provide initial (upstream) metadata */
1760 gst_base_parse_parse_frame (parse, frame);
1762 /* store offset as it might get overwritten */
1763 offset = GST_BUFFER_OFFSET (buffer);
1764 ret = klass->parse_frame (parse, frame);
1766 buffer = frame->buffer;
1767 /* subclass must play nice */
1768 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1770 /* check if subclass/format can provide ts.
1771 * If so, that allows and enables extra seek and duration determining options */
1772 if (G_UNLIKELY (parse->priv->first_frame_offset < 0 && ret == GST_FLOW_OK)) {
1773 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1774 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1775 parse->priv->first_frame_offset = offset;
1776 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1777 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1778 " for first frame at offset %" G_GINT64_FORMAT,
1779 GST_TIME_ARGS (parse->priv->first_frame_ts),
1780 parse->priv->first_frame_offset);
1781 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1783 GstClockTime last_ts = G_MAXINT64;
1785 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1786 gst_base_parse_locate_time (parse, &last_ts, &off);
1787 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1788 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1791 /* disable further checks */
1792 parse->priv->first_frame_offset = 0;
1796 /* again use default handler to add missing metadata;
1797 * we may have new information on frame properties */
1798 gst_base_parse_parse_frame (parse, frame);
1799 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1800 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1801 parse->priv->next_ts =
1802 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1804 /* we lost track, do not produce bogus time next time around
1805 * (probably means parser subclass has given up on parsing as well) */
1806 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1807 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1810 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1811 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1812 gst_base_parse_add_index_entry (parse, offset,
1813 GST_BUFFER_TIMESTAMP (buffer),
1814 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1816 /* First buffers are dropped, this means that the subclass needs more
1817 * frames to decide on the format and queues them internally */
1818 /* convert internal flow to OK and mark discont for the next buffer. */
1819 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1820 gst_base_parse_frame_free (frame);
1822 } else if (ret == GST_BASE_PARSE_FLOW_QUEUED) {
1823 gst_base_parse_queue_frame (parse, frame);
1825 } else if (ret != GST_FLOW_OK) {
1829 /* All OK, push queued frames if there are any */
1830 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1831 GstBaseParseFrame *queued_frame;
1833 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1834 gst_base_parse_push_frame (parse, queued_frame);
1838 return gst_base_parse_push_frame (parse, frame);
1842 * gst_base_parse_push_frame:
1843 * @parse: #GstBaseParse.
1844 * @frame: (transfer full): a #GstBaseParseFrame
1846 * Pushes the frame downstream, sends any pending events and
1847 * does some timestamp and segment handling. Takes ownership
1848 * of @frame and will clear it (if it was initialised with
1849 * gst_base_parse_frame_init()) or free it.
1851 * This must be called with sinkpad STREAM_LOCK held.
1853 * Returns: #GstFlowReturn
1858 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1860 GstFlowReturn ret = GST_FLOW_OK;
1861 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1862 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1863 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1867 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1868 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1870 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1872 buffer = frame->buffer;
1874 GST_LOG_OBJECT (parse,
1875 "processing buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT
1876 ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer),
1877 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1878 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1881 size = gst_buffer_get_size (buffer);
1882 parse->priv->bytecount += size;
1883 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1884 parse->priv->framecount++;
1885 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1886 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1889 /* 0 means disabled */
1890 if (parse->priv->update_interval < 0)
1891 parse->priv->update_interval = 50;
1892 else if (parse->priv->update_interval > 0 &&
1893 (parse->priv->framecount % parse->priv->update_interval) == 0)
1894 gst_base_parse_update_duration (parse);
1896 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1897 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1898 if (last_start != GST_CLOCK_TIME_NONE
1899 && GST_BUFFER_DURATION_IS_VALID (buffer))
1900 last_stop = last_start + GST_BUFFER_DURATION (buffer);
1902 /* should have caps by now */
1903 if (!gst_pad_has_current_caps (parse->srcpad))
1906 /* segment adjustment magic; only if we are running the whole show */
1907 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
1908 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
1909 parse->priv->upstream_seekable)) {
1910 /* segment times are typically estimates,
1911 * actual frame data might lead subclass to different timestamps,
1912 * so override segment start from what is supplied there */
1913 if (G_UNLIKELY (parse->priv->pending_segment && !parse->priv->exact_position
1914 && GST_CLOCK_TIME_IS_VALID (last_start))) {
1915 gst_event_unref (parse->priv->pending_segment);
1916 parse->segment.start =
1917 MIN ((guint64) last_start, (guint64) parse->segment.stop);
1919 GST_DEBUG_OBJECT (parse,
1920 "adjusting pending segment start to %" GST_TIME_FORMAT,
1921 GST_TIME_ARGS (parse->segment.start));
1923 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
1925 /* handle gaps, e.g. non-zero start-time, in as much not handled by above */
1926 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
1927 GST_CLOCK_TIME_IS_VALID (last_start)) {
1928 GstClockTimeDiff diff;
1930 /* only send newsegments with increasing start times,
1931 * otherwise if these go back and forth downstream (sinks) increase
1932 * accumulated time and running_time */
1933 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
1934 if (G_UNLIKELY (diff > 2 * GST_SECOND
1935 && last_start > parse->segment.start
1936 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
1937 || last_start < parse->segment.stop))) {
1939 GST_DEBUG_OBJECT (parse,
1940 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
1941 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
1942 "Sending updated NEWSEGMENT events", diff,
1943 GST_TIME_ARGS (parse->segment.position),
1944 GST_TIME_ARGS (last_start));
1946 if (G_UNLIKELY (parse->priv->pending_segment)) {
1947 gst_event_unref (parse->priv->pending_segment);
1948 parse->segment.start = last_start;
1949 parse->segment.time = last_start;
1950 parse->priv->pending_segment =
1951 gst_event_new_segment (&parse->segment);
1953 /* skip gap FIXME */
1954 gst_pad_push_event (parse->srcpad,
1955 gst_event_new_segment (&parse->segment));
1957 parse->segment.position = last_start;
1962 /* and should then also be linked downstream, so safe to send some events */
1963 if (G_UNLIKELY (parse->priv->close_segment)) {
1964 /* only set up by loop */
1965 GST_DEBUG_OBJECT (parse, "loop sending close segment");
1966 gst_pad_push_event (parse->srcpad, parse->priv->close_segment);
1967 parse->priv->close_segment = NULL;
1969 if (G_UNLIKELY (parse->priv->pending_segment)) {
1970 GstEvent *pending_segment;
1972 pending_segment = parse->priv->pending_segment;
1973 parse->priv->pending_segment = NULL;
1975 GST_DEBUG_OBJECT (parse, "%s push pending segment",
1976 parse->priv->pad_mode == GST_PAD_MODE_PULL ? "loop" : "chain");
1977 gst_pad_push_event (parse->srcpad, pending_segment);
1979 /* have caps; check identity */
1980 gst_base_parse_check_media (parse);
1983 /* update bitrates and optionally post corresponding tags
1984 * (following newsegment) */
1985 gst_base_parse_update_bitrates (parse, frame);
1987 if (G_UNLIKELY (parse->priv->pending_events)) {
1990 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
1991 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
1993 g_list_free (parse->priv->pending_events);
1994 parse->priv->pending_events = NULL;
1997 if (klass->pre_push_frame) {
1998 ret = klass->pre_push_frame (parse, frame);
2000 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
2003 /* take final ownership of frame buffer */
2004 buffer = frame->buffer;
2005 frame->buffer = NULL;
2007 /* subclass must play nice */
2008 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2010 parse->priv->seen_keyframe |= parse->priv->is_video &&
2011 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
2013 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
2014 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2015 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
2016 GST_BUFFER_TIMESTAMP (buffer) >
2017 parse->segment.stop + parse->priv->lead_out_ts) {
2018 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
2020 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2021 GST_BUFFER_DURATION_IS_VALID (buffer) &&
2022 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
2023 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
2024 parse->priv->lead_in_ts < parse->segment.start) {
2025 if (parse->priv->seen_keyframe) {
2026 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
2029 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
2030 ret = GST_BASE_PARSE_FLOW_DROPPED;
2037 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2038 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2039 gst_buffer_unref (buffer);
2041 } else if (ret == GST_FLOW_OK) {
2042 if (parse->segment.rate > 0.0) {
2043 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2045 ret = gst_pad_push (parse->srcpad, buffer);
2046 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2048 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2050 parse->priv->buffers_queued =
2051 g_slist_prepend (parse->priv->buffers_queued, buffer);
2055 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2056 size, gst_flow_get_name (ret));
2057 gst_buffer_unref (buffer);
2058 /* if we are not sufficiently in control, let upstream decide on EOS */
2059 if (ret == GST_FLOW_EOS &&
2060 (parse->priv->passthrough ||
2061 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2062 !parse->priv->upstream_seekable)))
2066 /* Update current running segment position */
2067 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
2068 parse->segment.position < last_stop)
2069 parse->segment.position = last_stop;
2071 gst_base_parse_frame_free (frame);
2078 GST_ELEMENT_ERROR (parse, STREAM, DECODE, ("No caps set"), (NULL));
2079 return GST_FLOW_ERROR;
2084 /* gst_base_parse_drain:
2086 * Drains the adapter until it is empty. It decreases the min_frame_size to
2087 * match the current adapter size and calls chain method until the adapter
2088 * is emptied or chain returns with error.
2091 gst_base_parse_drain (GstBaseParse * parse)
2095 GST_DEBUG_OBJECT (parse, "draining");
2096 parse->priv->drain = TRUE;
2099 avail = gst_adapter_available (parse->priv->adapter);
2103 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2104 NULL) != GST_FLOW_OK) {
2108 /* nothing changed, maybe due to truncated frame; break infinite loop */
2109 if (avail == gst_adapter_available (parse->priv->adapter)) {
2110 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2111 gst_adapter_clear (parse->priv->adapter);
2115 parse->priv->drain = FALSE;
2118 /* gst_base_parse_send_buffers
2120 * Sends buffers collected in send_buffers downstream, and ensures that list
2121 * is empty at the end (errors or not).
2123 static GstFlowReturn
2124 gst_base_parse_send_buffers (GstBaseParse * parse)
2126 GSList *send = NULL;
2128 GstFlowReturn ret = GST_FLOW_OK;
2130 send = parse->priv->buffers_send;
2134 buf = GST_BUFFER_CAST (send->data);
2135 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
2136 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2137 ", offset %" G_GINT64_FORMAT, buf,
2138 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
2139 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2141 /* iterate output queue an push downstream */
2142 ret = gst_pad_push (parse->srcpad, buf);
2143 send = g_slist_delete_link (send, send);
2145 /* clear any leftover if error */
2146 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2148 buf = GST_BUFFER_CAST (send->data);
2149 gst_buffer_unref (buf);
2150 send = g_slist_delete_link (send, send);
2155 parse->priv->buffers_send = send;
2160 /* gst_base_parse_process_fragment:
2162 * Processes a reverse playback (forward) fragment:
2163 * - append head of last fragment that was skipped to current fragment data
2164 * - drain the resulting current fragment data (i.e. repeated chain)
2165 * - add time/duration (if needed) to frames queued by chain
2166 * - push queued data
2168 static GstFlowReturn
2169 gst_base_parse_process_fragment (GstBaseParse * parse, gboolean push_only)
2172 GstFlowReturn ret = GST_FLOW_OK;
2173 gboolean seen_key = FALSE, seen_delta = FALSE;
2179 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2180 while (parse->priv->buffers_pending) {
2181 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2182 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2183 gst_buffer_get_size (buf));
2184 gst_adapter_push (parse->priv->adapter, buf);
2185 parse->priv->buffers_pending =
2186 g_slist_delete_link (parse->priv->buffers_pending,
2187 parse->priv->buffers_pending);
2190 /* invalidate so no fall-back timestamping is performed;
2191 * ok if taken from subclass or upstream */
2192 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2193 /* prevent it hanging around stop all the time */
2194 parse->segment.position = GST_CLOCK_TIME_NONE;
2196 parse->priv->discont = TRUE;
2198 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2199 /* initial skipped data is added to buffers_pending */
2200 gst_base_parse_drain (parse);
2203 if (parse->priv->buffers_send) {
2204 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2205 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2208 /* add metadata (if needed to queued buffers */
2209 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2210 GST_TIME_ARGS (parse->priv->last_ts));
2211 while (parse->priv->buffers_queued) {
2212 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2214 /* no touching if upstream or parsing provided time */
2215 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2216 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2217 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2218 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2219 GST_BUFFER_DURATION_IS_VALID (buf)) {
2220 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2221 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2223 parse->priv->last_ts = 0;
2224 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2225 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2226 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2228 /* no idea, very bad */
2229 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2232 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2234 /* reverse order for ascending sending */
2235 /* send downstream at keyframe not preceded by a keyframe
2236 * (e.g. that should identify start of collection of IDR nals) */
2237 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2239 ret = gst_base_parse_send_buffers (parse);
2240 /* if a problem, throw all to sending */
2241 if (ret != GST_FLOW_OK) {
2242 parse->priv->buffers_send =
2243 g_slist_reverse (parse->priv->buffers_queued);
2244 parse->priv->buffers_queued = NULL;
2253 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2255 parse->priv->buffers_send =
2256 g_slist_prepend (parse->priv->buffers_send, buf);
2257 parse->priv->buffers_queued =
2258 g_slist_delete_link (parse->priv->buffers_queued,
2259 parse->priv->buffers_queued);
2262 /* audio may have all marked as keyframe, so arrange to send here */
2264 ret = gst_base_parse_send_buffers (parse);
2266 /* any trailing unused no longer usable (ideally none) */
2267 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2268 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2269 gst_adapter_available (parse->priv->adapter));
2270 gst_adapter_clear (parse->priv->adapter);
2276 /* small helper that checks whether we have been trying to resync too long */
2277 static inline GstFlowReturn
2278 gst_base_parse_check_sync (GstBaseParse * parse)
2280 if (G_UNLIKELY (parse->priv->discont &&
2281 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2282 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2283 ("Failed to parse stream"), (NULL));
2284 return GST_FLOW_ERROR;
2290 static GstFlowReturn
2291 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
2293 GstBaseParseClass *bclass;
2294 GstBaseParse *parse;
2295 GstFlowReturn ret = GST_FLOW_OK;
2296 GstBuffer *outbuf = NULL;
2297 GstBuffer *tmpbuf = NULL;
2301 guint old_min_size = 0, min_size, av;
2302 GstClockTime timestamp;
2303 GstBaseParseFrame *frame;
2305 parse = GST_BASE_PARSE (parent);
2306 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2308 if (parse->priv->detecting) {
2309 GstBuffer *detect_buf;
2311 if (parse->priv->detect_buffers_size == 0) {
2312 detect_buf = gst_buffer_ref (buffer);
2317 detect_buf = gst_buffer_new ();
2319 for (l = parse->priv->detect_buffers; l; l = l->next) {
2320 gsize tmpsize = gst_buffer_get_size (l->data);
2322 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
2323 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
2327 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
2328 offset, gst_buffer_get_size (buffer));
2331 ret = bclass->detect (parse, detect_buf);
2332 gst_buffer_unref (detect_buf);
2334 if (ret == GST_FLOW_OK) {
2337 /* Detected something */
2338 parse->priv->detecting = FALSE;
2340 for (l = parse->priv->detect_buffers; l; l = l->next) {
2341 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2343 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2344 parent, GST_BUFFER_CAST (l->data));
2346 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2348 g_list_free (parse->priv->detect_buffers);
2349 parse->priv->detect_buffers = NULL;
2350 parse->priv->detect_buffers_size = 0;
2352 if (ret != GST_FLOW_OK) {
2356 /* Handle the current buffer */
2357 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2358 /* Still detecting, append buffer or error out if draining */
2360 if (parse->priv->drain) {
2361 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2362 return GST_FLOW_ERROR;
2363 } else if (parse->priv->flushing) {
2364 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2366 g_list_free (parse->priv->detect_buffers);
2367 parse->priv->detect_buffers = NULL;
2368 parse->priv->detect_buffers_size = 0;
2370 parse->priv->detect_buffers =
2371 g_list_append (parse->priv->detect_buffers, buffer);
2372 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
2376 /* Something went wrong, subclass responsible for error reporting */
2380 /* And now handle the current buffer if detection worked */
2383 frame = &parse->priv->frame;
2385 if (G_LIKELY (buffer)) {
2386 GST_LOG_OBJECT (parse,
2387 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT,
2388 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer));
2389 if (G_UNLIKELY (parse->priv->passthrough)) {
2390 gst_base_parse_frame_init (frame);
2391 frame->buffer = gst_buffer_make_writable (buffer);
2392 return gst_base_parse_push_frame (parse, frame);
2394 /* upstream feeding us in reverse playback;
2395 * gather each fragment, then process it in single run */
2396 if (parse->segment.rate < 0.0) {
2397 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2398 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2399 ret = gst_base_parse_process_fragment (parse, FALSE);
2401 gst_adapter_push (parse->priv->adapter, buffer);
2404 gst_adapter_push (parse->priv->adapter, buffer);
2407 if (G_UNLIKELY (buffer &&
2408 GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2409 frame->_private_flags |= GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
2410 gst_base_parse_frame_free (frame);
2413 /* Parse and push as many frames as possible */
2414 /* Stop either when adapter is empty or we are flushing */
2415 while (!parse->priv->flushing) {
2418 /* maintain frame state for a single frame parsing round across _chain calls,
2419 * so only init when needed */
2420 if (!frame->_private_flags)
2421 gst_base_parse_frame_init (frame);
2423 tmpbuf = gst_buffer_new ();
2426 /* Synchronization loop */
2428 /* note: if subclass indicates MAX fsize,
2429 * this will not likely be available anyway ... */
2430 min_size = MAX (parse->priv->min_frame_size, fsize);
2431 av = gst_adapter_available (parse->priv->adapter);
2433 /* loop safety check */
2434 if (G_UNLIKELY (old_min_size >= min_size))
2436 old_min_size = min_size;
2438 if (G_UNLIKELY (parse->priv->drain)) {
2440 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2441 if (G_UNLIKELY (!min_size)) {
2442 gst_buffer_unref (tmpbuf);
2447 /* Collect at least min_frame_size bytes */
2448 if (av < min_size) {
2449 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)",
2451 gst_buffer_unref (tmpbuf);
2455 /* always pass all available data */
2456 data = gst_adapter_map (parse->priv->adapter, av);
2457 gst_buffer_take_memory (tmpbuf, -1,
2458 gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY,
2459 (gpointer) data, NULL, av, 0, av));
2460 GST_BUFFER_OFFSET (tmpbuf) = parse->priv->offset;
2462 if (parse->priv->discont) {
2463 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2464 GST_BUFFER_FLAG_SET (tmpbuf, GST_BUFFER_FLAG_DISCONT);
2468 gst_base_parse_frame_update (parse, frame, tmpbuf);
2469 res = bclass->check_valid_frame (parse, frame, &fsize, &skip);
2470 gst_adapter_unmap (parse->priv->adapter);
2471 gst_buffer_replace (&frame->buffer, NULL);
2472 gst_buffer_remove_memory_range (tmpbuf, 0, -1);
2474 if (gst_adapter_available (parse->priv->adapter) < fsize) {
2475 GST_DEBUG_OBJECT (parse, "found valid frame but not enough data"
2476 " available (only %" G_GSIZE_FORMAT " bytes)",
2477 gst_adapter_available (parse->priv->adapter));
2478 gst_buffer_unref (tmpbuf);
2481 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2485 /* subclass didn't touch this value. By default we skip 1 byte */
2489 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2490 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2491 /* reverse playback, and no frames found yet, so we are skipping
2492 * the leading part of a fragment, which may form the tail of
2493 * fragment coming later, hopefully subclass skips efficiently ... */
2494 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2495 outbuf = gst_adapter_take_buffer (parse->priv->adapter, skip);
2496 outbuf = gst_buffer_make_writable (outbuf);
2497 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
2498 parse->priv->buffers_pending =
2499 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2502 gst_adapter_flush (parse->priv->adapter, skip);
2504 parse->priv->offset += skip;
2505 if (!parse->priv->discont)
2506 parse->priv->sync_offset = parse->priv->offset;
2507 parse->priv->discont = TRUE;
2508 /* something changed least; nullify loop check */
2511 /* skip == 0 should imply subclass set min_size to need more data;
2512 * we check this shortly */
2513 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2514 gst_buffer_unref (tmpbuf);
2518 gst_buffer_unref (tmpbuf);
2522 /* Subclass found the sync, but still wants to skip some data */
2523 GST_LOG_OBJECT (parse, "skipping %d bytes", skip);
2524 gst_adapter_flush (parse->priv->adapter, skip);
2525 parse->priv->offset += skip;
2528 /* Grab lock to prevent a race with FLUSH_START handler */
2529 GST_PAD_STREAM_LOCK (parse->srcpad);
2531 /* FLUSH_START event causes the "flushing" flag to be set. In this
2532 * case we can leave the frame pushing loop */
2533 if (parse->priv->flushing) {
2534 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2538 /* move along with upstream timestamp (if any),
2539 * but interpolate in between */
2540 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2541 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2542 (parse->priv->prev_ts != timestamp)) {
2543 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2546 /* FIXME: Would it be more efficient to make a subbuffer instead? */
2547 outbuf = gst_adapter_take_buffer (parse->priv->adapter, fsize);
2548 outbuf = gst_buffer_make_writable (outbuf);
2550 /* Subclass may want to know the data offset */
2551 GST_BUFFER_OFFSET (outbuf) = parse->priv->offset;
2552 parse->priv->offset += fsize;
2553 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2554 GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
2556 frame->buffer = outbuf;
2557 ret = gst_base_parse_handle_and_push_frame (parse, bclass, frame);
2558 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2560 if (ret != GST_FLOW_OK) {
2561 GST_LOG_OBJECT (parse, "push returned %d", ret);
2567 GST_LOG_OBJECT (parse, "chain leaving");
2573 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2574 ("min_size evolution %d -> %d; breaking to avoid looping",
2575 old_min_size, min_size));
2576 return GST_FLOW_ERROR;
2580 /* pull @size bytes at current offset,
2581 * i.e. at least try to and possibly return a shorter buffer if near the end */
2582 static GstFlowReturn
2583 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2584 GstBuffer ** buffer)
2586 GstFlowReturn ret = GST_FLOW_OK;
2588 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2590 /* Caching here actually makes much less difference than one would expect.
2591 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2592 if (parse->priv->cache) {
2593 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2594 gint cache_size = gst_buffer_get_size (parse->priv->cache);
2596 if (cache_offset <= parse->priv->offset &&
2597 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2598 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
2599 parse->priv->offset - cache_offset, size);
2600 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2603 /* not enough data in the cache, free cache and get a new one */
2604 gst_buffer_unref (parse->priv->cache);
2605 parse->priv->cache = NULL;
2608 /* refill the cache */
2610 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2611 64 * 1024), &parse->priv->cache);
2612 if (ret != GST_FLOW_OK) {
2613 parse->priv->cache = NULL;
2617 if (gst_buffer_get_size (parse->priv->cache) >= size) {
2619 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
2621 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2625 /* Not possible to get enough data, try a last time with
2626 * requesting exactly the size we need */
2627 gst_buffer_unref (parse->priv->cache);
2628 parse->priv->cache = NULL;
2630 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2631 &parse->priv->cache);
2633 if (ret != GST_FLOW_OK) {
2634 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2639 if (gst_buffer_get_size (parse->priv->cache) < size) {
2640 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2641 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
2642 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
2644 *buffer = parse->priv->cache;
2645 parse->priv->cache = NULL;
2651 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
2652 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2657 static GstFlowReturn
2658 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2661 GstClockTime ts = 0;
2665 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2666 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2667 parse->priv->last_offset);
2669 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2670 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2671 GST_TIME_ARGS (parse->segment.start));
2676 /* last fragment started at last_offset / last_ts;
2677 * seek back 10s capped at 1MB */
2678 if (parse->priv->last_ts >= 10 * GST_SECOND)
2679 ts = parse->priv->last_ts - 10 * GST_SECOND;
2680 /* if we are exact now, we will be more so going backwards */
2681 if (parse->priv->exact_position) {
2682 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2684 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2685 GST_FORMAT_BYTES, &offset)) {
2686 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2689 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2690 parse->priv->last_offset - 1024);
2691 offset = MAX (0, offset);
2693 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2695 parse->priv->offset = offset;
2697 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2699 if (ret != GST_FLOW_OK)
2702 /* offset will increase again as fragment is processed/parsed */
2703 parse->priv->last_offset = offset;
2705 gst_adapter_push (parse->priv->adapter, buffer);
2706 ret = gst_base_parse_process_fragment (parse, FALSE);
2707 if (ret != GST_FLOW_OK)
2710 /* force previous fragment */
2711 parse->priv->offset = -1;
2718 * pull and scan for next frame starting from current offset
2719 * ajusts sync, drain and offset going along */
2720 static GstFlowReturn
2721 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2722 GstBaseParseFrame * frame, gboolean full)
2724 GstBuffer *buffer, *outbuf;
2725 GstFlowReturn ret = GST_FLOW_OK;
2726 guint fsize = 1, min_size, old_min_size = 0;
2729 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2731 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2732 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2734 /* let's make this efficient for all subclass once and for all;
2735 * maybe it does not need this much, but in the latter case, we know we are
2736 * in pull mode here and might as well try to read and supply more anyway
2737 * (so does the buffer caching mechanism) */
2743 min_size = MAX (parse->priv->min_frame_size, fsize);
2744 /* loop safety check */
2745 if (G_UNLIKELY (old_min_size >= min_size))
2747 old_min_size = min_size;
2749 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2750 if (ret != GST_FLOW_OK)
2753 if (parse->priv->discont) {
2754 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2755 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
2758 /* if we got a short read, inform subclass we are draining leftover
2759 * and no more is to be expected */
2760 if (gst_buffer_get_size (buffer) < min_size)
2761 parse->priv->drain = TRUE;
2763 if (parse->priv->detecting) {
2764 ret = klass->detect (parse, buffer);
2765 if (ret == GST_FLOW_NOT_NEGOTIATED) {
2766 /* If draining we error out, otherwise request a buffer
2768 if (parse->priv->drain) {
2769 gst_buffer_unref (buffer);
2770 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
2771 return GST_FLOW_ERROR;
2774 gst_buffer_unref (buffer);
2777 } else if (ret != GST_FLOW_OK) {
2778 gst_buffer_unref (buffer);
2779 GST_ERROR_OBJECT (parse, "detect() returned %s",
2780 gst_flow_get_name (ret));
2784 /* Else handle this buffer normally */
2788 gst_base_parse_frame_update (parse, frame, buffer);
2789 res = klass->check_valid_frame (parse, frame, &fsize, &skip);
2790 gst_buffer_replace (&frame->buffer, NULL);
2792 parse->priv->drain = FALSE;
2793 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2796 parse->priv->drain = FALSE;
2800 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2801 if (full && parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2802 /* reverse playback, and no frames found yet, so we are skipping
2803 * the leading part of a fragment, which may form the tail of
2804 * fragment coming later, hopefully subclass skips efficiently ... */
2805 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, 0, skip);
2806 parse->priv->buffers_pending =
2807 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2810 parse->priv->offset += skip;
2811 if (!parse->priv->discont)
2812 parse->priv->sync_offset = parse->priv->offset;
2813 parse->priv->discont = TRUE;
2814 /* something changed at least; nullify loop check */
2815 if (fsize == G_MAXUINT)
2816 fsize = old_min_size + 64 * 1024;
2819 /* skip == 0 should imply subclass set min_size to need more data;
2820 * we check this shortly */
2821 GST_DEBUG_OBJECT (parse, "finding sync...");
2822 gst_buffer_unref (buffer);
2823 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2828 /* Does the subclass want to skip too? */
2830 parse->priv->offset += skip;
2834 if (fsize + skip <= gst_buffer_get_size (buffer)) {
2835 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, skip, fsize);
2836 GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer) + skip;
2837 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2838 gst_buffer_unref (buffer);
2840 gst_buffer_unref (buffer);
2841 ret = gst_base_parse_pull_range (parse, fsize, &outbuf);
2842 if (ret != GST_FLOW_OK)
2844 if (gst_buffer_get_size (outbuf) < fsize) {
2845 gst_buffer_unref (outbuf);
2850 parse->priv->offset += fsize;
2852 frame->buffer = outbuf;
2860 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2861 ("min_size evolution %d -> %d; breaking to avoid looping",
2862 old_min_size, min_size));
2863 return GST_FLOW_ERROR;
2867 /* Loop that is used in pull mode to retrieve data from upstream */
2869 gst_base_parse_loop (GstPad * pad)
2871 GstBaseParse *parse;
2872 GstBaseParseClass *klass;
2873 GstFlowReturn ret = GST_FLOW_OK;
2874 GstBaseParseFrame frame;
2876 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2877 klass = GST_BASE_PARSE_GET_CLASS (parse);
2879 /* reverse playback:
2880 * first fragment (closest to stop time) is handled normally below,
2881 * then we pull in fragments going backwards */
2882 if (parse->segment.rate < 0.0) {
2883 /* check if we jumped back to a previous fragment,
2884 * which is a post-first fragment */
2885 if (parse->priv->offset < 0) {
2886 ret = gst_base_parse_handle_previous_fragment (parse);
2891 gst_base_parse_frame_init (&frame);
2892 ret = gst_base_parse_scan_frame (parse, klass, &frame, TRUE);
2893 if (ret != GST_FLOW_OK)
2896 /* This always cleans up frame, even if error occurs */
2897 ret = gst_base_parse_handle_and_push_frame (parse, klass, &frame);
2899 /* eat expected eos signalling past segment in reverse playback */
2900 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
2901 parse->segment.position >= parse->segment.stop) {
2902 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2903 /* push what was accumulated during loop run */
2904 gst_base_parse_process_fragment (parse, TRUE);
2905 /* force previous fragment */
2906 parse->priv->offset = -1;
2911 if (ret == GST_FLOW_EOS)
2913 else if (ret != GST_FLOW_OK)
2916 gst_object_unref (parse);
2923 GST_DEBUG_OBJECT (parse, "eos");
2928 gboolean push_eos = FALSE;
2930 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2931 gst_flow_get_name (ret));
2932 gst_pad_pause_task (parse->sinkpad);
2934 if (ret == GST_FLOW_EOS) {
2935 /* handle end-of-stream/segment */
2936 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2939 if ((stop = parse->segment.stop) == -1)
2940 stop = parse->segment.duration;
2942 GST_DEBUG_OBJECT (parse, "sending segment_done");
2944 gst_element_post_message
2945 (GST_ELEMENT_CAST (parse),
2946 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2947 GST_FORMAT_TIME, stop));
2949 /* If we STILL have zero frames processed, fire an error */
2950 if (parse->priv->framecount == 0) {
2951 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2952 ("No valid frames found before end of stream"), (NULL));
2956 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
2957 /* for fatal errors we post an error message, wrong-state is
2958 * not fatal because it happens due to flushes and only means
2959 * that we should stop now. */
2960 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2961 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
2965 /* newsegment before eos */
2966 if (parse->priv->pending_segment) {
2967 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
2968 parse->priv->pending_segment = NULL;
2970 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
2972 gst_object_unref (parse);
2977 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
2979 GstBaseParse *parse;
2980 gboolean result = TRUE;
2984 parse = GST_BASE_PARSE (parent);
2986 GST_DEBUG_OBJECT (parse, "sink activate");
2988 query = gst_query_new_scheduling ();
2989 result = gst_pad_peer_query (sinkpad, query);
2991 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL);
2995 gst_query_unref (query);
2998 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
2999 result = gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE);
3001 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
3002 result = gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
3005 GST_DEBUG_OBJECT (parse, "sink activate return %d", result);
3010 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
3012 GstBaseParseClass *klass;
3013 gboolean result = TRUE;
3015 GST_DEBUG_OBJECT (parse, "activate %d", active);
3017 klass = GST_BASE_PARSE_GET_CLASS (parse);
3020 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
3021 result = klass->start (parse);
3023 /* If the subclass implements ::detect we want to
3024 * call it for the first buffers now */
3025 parse->priv->detecting = (klass->detect != NULL);
3027 /* We must make sure streaming has finished before resetting things
3028 * and calling the ::stop vfunc */
3029 GST_PAD_STREAM_LOCK (parse->sinkpad);
3030 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3032 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
3033 result = klass->stop (parse);
3035 parse->priv->pad_mode = GST_PAD_MODE_NONE;
3037 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
3042 gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
3043 GstPadMode mode, gboolean active)
3045 gboolean result = TRUE;
3046 GstBaseParse *parse;
3048 parse = GST_BASE_PARSE (parent);
3050 GST_DEBUG_OBJECT (parse, "sink activate mode %d, %d", mode, active);
3052 result = gst_base_parse_activate (parse, active);
3056 case GST_PAD_MODE_PULL:
3058 parse->priv->pending_segment =
3059 gst_event_new_segment (&parse->segment);
3061 gst_pad_start_task (pad, (GstTaskFunction) gst_base_parse_loop,
3064 result &= gst_pad_stop_task (pad);
3072 parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
3074 GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
3080 * gst_base_parse_set_duration:
3081 * @parse: #GstBaseParse.
3083 * @duration: duration value.
3084 * @interval: how often to update the duration estimate based on bitrate, or 0.
3086 * Sets the duration of the currently playing media. Subclass can use this
3087 * when it is able to determine duration and/or notices a change in the media
3088 * duration. Alternatively, if @interval is non-zero (default), then stream
3089 * duration is determined based on estimated bitrate, and updated every @interval
3095 gst_base_parse_set_duration (GstBaseParse * parse,
3096 GstFormat fmt, gint64 duration, gint interval)
3098 g_return_if_fail (parse != NULL);
3100 if (parse->priv->upstream_has_duration) {
3101 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3105 if (duration != parse->priv->duration) {
3108 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
3109 gst_element_post_message (GST_ELEMENT (parse), m);
3111 /* TODO: what about duration tag? */
3113 parse->priv->duration = duration;
3114 parse->priv->duration_fmt = fmt;
3115 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3116 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3117 if (interval != 0) {
3118 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3122 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3123 parse->priv->update_interval = interval;
3129 * gst_base_parse_set_average_bitrate:
3130 * @parse: #GstBaseParse.
3131 * @bitrate: average bitrate in bits/second
3133 * Optionally sets the average bitrate detected in media (if non-zero),
3134 * e.g. based on metadata, as it will be posted to the application.
3136 * By default, announced average bitrate is estimated. The average bitrate
3137 * is used to estimate the total duration of the stream and to estimate
3138 * a seek position, if there's no index and the format is syncable
3139 * (see gst_base_parse_set_syncable()).
3144 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3146 parse->priv->bitrate = bitrate;
3147 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3151 * gst_base_parse_set_min_frame_size:
3152 * @parse: #GstBaseParse.
3153 * @min_size: Minimum size of the data that this base class should give to
3156 * Subclass can use this function to tell the base class that it needs to
3157 * give at least #min_size buffers.
3162 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3164 g_return_if_fail (parse != NULL);
3166 parse->priv->min_frame_size = min_size;
3167 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3171 * gst_base_parse_set_frame_rate:
3172 * @parse: the #GstBaseParse to set
3173 * @fps_num: frames per second (numerator).
3174 * @fps_den: frames per second (denominator).
3175 * @lead_in: frames needed before a segment for subsequent decode
3176 * @lead_out: frames needed after a segment
3178 * If frames per second is configured, parser can take care of buffer duration
3179 * and timestamping. When performing segment clipping, or seeking to a specific
3180 * location, a corresponding decoder might need an initial @lead_in and a
3181 * following @lead_out number of frames to ensure the desired segment is
3182 * entirely filled upon decoding.
3187 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3188 guint fps_den, guint lead_in, guint lead_out)
3190 g_return_if_fail (parse != NULL);
3192 parse->priv->fps_num = fps_num;
3193 parse->priv->fps_den = fps_den;
3194 if (!fps_num || !fps_den) {
3195 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3197 fps_num = fps_den = 0;
3198 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3199 parse->priv->lead_in = parse->priv->lead_out = 0;
3200 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3202 parse->priv->frame_duration =
3203 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3204 parse->priv->lead_in = lead_in;
3205 parse->priv->lead_out = lead_out;
3206 parse->priv->lead_in_ts =
3207 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3208 parse->priv->lead_out_ts =
3209 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3210 /* aim for about 1.5s to estimate duration */
3211 if (parse->priv->update_interval < 0) {
3212 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3213 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3214 parse->priv->update_interval);
3217 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3218 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3219 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3220 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3221 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3222 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3226 * gst_base_parse_set_has_timing_info:
3227 * @parse: a #GstBaseParse
3228 * @has_timing: whether frames carry timing information
3230 * Set if frames carry timing information which the subclass can (generally)
3231 * parse and provide. In particular, intrinsic (rather than estimated) time
3232 * can be obtained following a seek.
3237 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3239 parse->priv->has_timing_info = has_timing;
3240 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3244 * gst_base_parse_set_syncable:
3245 * @parse: a #GstBaseParse
3246 * @syncable: set if frame starts can be identified
3248 * Set if frame starts can be identified. This is set by default and
3249 * determines whether seeking based on bitrate averages
3250 * is possible for a format/stream.
3255 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3257 parse->priv->syncable = syncable;
3258 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3262 * gst_base_parse_set_passthrough:
3263 * @parse: a #GstBaseParse
3264 * @passthrough: %TRUE if parser should run in passthrough mode
3266 * Set if the nature of the format or configuration does not allow (much)
3267 * parsing, and the parser should operate in passthrough mode (which only
3268 * applies when operating in push mode). That is, incoming buffers are
3269 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3270 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3271 * so subclass can perform as much or as little is appropriate for
3272 * passthrough semantics in @pre_push_frame.
3277 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3279 parse->priv->passthrough = passthrough;
3280 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3284 * gst_base_parse_set_latency:
3285 * @parse: a #GstBaseParse
3286 * @min_latency: minimum parse latency
3287 * @max_latency: maximum parse latency
3289 * Sets the minimum and maximum (which may likely be equal) latency introduced
3290 * by the parsing process. If there is such a latency, which depends on the
3291 * particular parsing of the format, it typically corresponds to 1 frame duration.
3296 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3297 GstClockTime max_latency)
3299 GST_OBJECT_LOCK (parse);
3300 parse->priv->min_latency = min_latency;
3301 parse->priv->max_latency = max_latency;
3302 GST_OBJECT_UNLOCK (parse);
3303 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3304 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3305 GST_TIME_ARGS (max_latency));
3309 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3310 GstClockTime * duration)
3312 gboolean res = FALSE;
3314 g_return_val_if_fail (duration != NULL, FALSE);
3316 *duration = GST_CLOCK_TIME_NONE;
3317 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3318 GST_LOG_OBJECT (parse, "using provided duration");
3319 *duration = parse->priv->duration;
3321 } else if (parse->priv->duration != -1) {
3322 GST_LOG_OBJECT (parse, "converting provided duration");
3323 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3324 parse->priv->duration, format, (gint64 *) duration);
3325 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3326 GST_LOG_OBJECT (parse, "using estimated duration");
3327 *duration = parse->priv->estimated_duration;
3331 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3332 GST_TIME_ARGS (*duration));
3337 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
3339 GstBaseParse *parse;
3340 gboolean res = FALSE;
3342 parse = GST_BASE_PARSE (parent);
3344 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3346 switch (GST_QUERY_TYPE (query)) {
3347 case GST_QUERY_POSITION:
3352 GST_DEBUG_OBJECT (parse, "position query");
3353 gst_query_parse_position (query, &format, NULL);
3355 /* try upstream first */
3356 res = gst_pad_query_default (pad, parent, query);
3358 /* Fall back on interpreting segment */
3359 GST_OBJECT_LOCK (parse);
3360 if (format == GST_FORMAT_BYTES) {
3361 dest_value = parse->priv->offset;
3363 } else if (format == parse->segment.format &&
3364 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
3365 dest_value = gst_segment_to_stream_time (&parse->segment,
3366 parse->segment.format, parse->segment.position);
3369 GST_OBJECT_UNLOCK (parse);
3371 /* no precise result, upstream no idea either, then best estimate */
3372 /* priv->offset is updated in both PUSH/PULL modes */
3373 res = gst_base_parse_convert (parse,
3374 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3377 gst_query_set_position (query, format, dest_value);
3381 case GST_QUERY_DURATION:
3384 GstClockTime duration;
3386 GST_DEBUG_OBJECT (parse, "duration query");
3387 gst_query_parse_duration (query, &format, NULL);
3389 /* consult upstream */
3390 res = gst_pad_query_default (pad, parent, query);
3392 /* otherwise best estimate from us */
3394 res = gst_base_parse_get_duration (parse, format, &duration);
3396 gst_query_set_duration (query, format, duration);
3400 case GST_QUERY_SEEKING:
3403 GstClockTime duration = GST_CLOCK_TIME_NONE;
3404 gboolean seekable = FALSE;
3406 GST_DEBUG_OBJECT (parse, "seeking query");
3407 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3409 /* consult upstream */
3410 res = gst_pad_query_default (pad, parent, query);
3412 /* we may be able to help if in TIME */
3413 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3414 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3415 /* already OK if upstream takes care */
3416 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3418 if (!(res && seekable)) {
3419 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3420 || duration == -1) {
3421 /* seekable if we still have a chance to get duration later on */
3423 parse->priv->upstream_seekable && parse->priv->update_interval;
3425 seekable = parse->priv->upstream_seekable;
3426 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3429 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3435 case GST_QUERY_FORMATS:
3436 gst_query_set_formatsv (query, 3, fmtlist);
3439 case GST_QUERY_CONVERT:
3441 GstFormat src_format, dest_format;
3442 gint64 src_value, dest_value;
3444 gst_query_parse_convert (query, &src_format, &src_value,
3445 &dest_format, &dest_value);
3447 res = gst_base_parse_convert (parse, src_format, src_value,
3448 dest_format, &dest_value);
3450 gst_query_set_convert (query, src_format, src_value,
3451 dest_format, dest_value);
3455 case GST_QUERY_LATENCY:
3457 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3459 GstClockTime min_latency, max_latency;
3461 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3462 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3463 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3464 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3466 GST_OBJECT_LOCK (parse);
3467 /* add our latency */
3468 if (min_latency != -1)
3469 min_latency += parse->priv->min_latency;
3470 if (max_latency != -1)
3471 max_latency += parse->priv->max_latency;
3472 GST_OBJECT_UNLOCK (parse);
3474 gst_query_set_latency (query, live, min_latency, max_latency);
3479 res = gst_pad_query_default (pad, parent, query);
3485 /* scans for a cluster start from @pos,
3486 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3487 static GstFlowReturn
3488 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3489 GstClockTime * time, GstClockTime * duration)
3491 GstBaseParseClass *klass;
3493 gboolean orig_drain, orig_discont;
3494 GstFlowReturn ret = GST_FLOW_OK;
3495 GstBuffer *buf = NULL;
3496 GstBaseParseFrame frame;
3498 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3499 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3500 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3502 klass = GST_BASE_PARSE_GET_CLASS (parse);
3504 *time = GST_CLOCK_TIME_NONE;
3505 *duration = GST_CLOCK_TIME_NONE;
3508 orig_offset = parse->priv->offset;
3509 orig_discont = parse->priv->discont;
3510 orig_drain = parse->priv->drain;
3512 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3513 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3515 gst_base_parse_frame_init (&frame);
3517 /* jump elsewhere and locate next frame */
3518 parse->priv->offset = *pos;
3519 ret = gst_base_parse_scan_frame (parse, klass, &frame, FALSE);
3520 if (ret != GST_FLOW_OK)
3524 GST_LOG_OBJECT (parse,
3525 "peek parsing frame at offset %" G_GUINT64_FORMAT
3526 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
3527 GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET (buf),
3528 gst_buffer_get_size (buf));
3530 /* get offset first, subclass parsing might dump other stuff in there */
3531 *pos = GST_BUFFER_OFFSET (buf);
3532 ret = klass->parse_frame (parse, &frame);
3535 /* but it should provide proper time */
3536 *time = GST_BUFFER_TIMESTAMP (buf);
3537 *duration = GST_BUFFER_DURATION (buf);
3539 gst_base_parse_frame_free (&frame);
3541 GST_LOG_OBJECT (parse,
3542 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3543 GST_TIME_ARGS (*time), *pos);
3547 parse->priv->offset = orig_offset;
3548 parse->priv->discont = orig_discont;
3549 parse->priv->drain = orig_drain;
3554 /* bisect and scan through file for frame starting before @time,
3555 * returns OK and @time/@offset if found, NONE and/or error otherwise
3556 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3557 static GstFlowReturn
3558 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3561 GstFlowReturn ret = GST_FLOW_OK;
3562 gint64 lpos, hpos, newpos;
3563 GstClockTime time, ltime, htime, newtime, dur;
3564 gboolean cont = TRUE;
3565 const GstClockTime tolerance = TARGET_DIFFERENCE;
3566 const guint chunk = 4 * 1024;
3568 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3569 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3571 GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
3572 GST_TIME_ARGS (*_time));
3574 /* TODO also make keyframe aware if useful some day */
3589 /* do not know at first */
3591 *_time = GST_CLOCK_TIME_NONE;
3593 /* need initial positions; start and end */
3594 lpos = parse->priv->first_frame_offset;
3595 ltime = parse->priv->first_frame_ts;
3596 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
3597 GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
3598 return GST_FLOW_ERROR;
3600 hpos = parse->priv->upstream_size;
3602 GST_DEBUG_OBJECT (parse,
3603 "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
3604 ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, htime,
3605 GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
3607 /* check preconditions are satisfied;
3608 * start and end are needed, except for special case where we scan for
3609 * last frame to determine duration */
3610 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
3611 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3612 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3616 /* shortcut cases */
3619 } else if (time < ltime + tolerance) {
3623 } else if (time >= htime) {
3629 while (htime > ltime && cont) {
3630 GST_LOG_OBJECT (parse,
3631 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3632 GST_TIME_ARGS (ltime));
3633 GST_LOG_OBJECT (parse,
3634 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3635 GST_TIME_ARGS (htime));
3636 if (G_UNLIKELY (time == G_MAXINT64)) {
3638 } else if (G_LIKELY (hpos > lpos)) {
3640 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3643 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3645 /* we check this case once, but not forever, so break loop */
3650 newpos = CLAMP (newpos, lpos, hpos);
3651 GST_LOG_OBJECT (parse,
3652 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3653 GST_TIME_ARGS (time), newpos);
3655 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3656 if (ret == GST_FLOW_EOS) {
3657 /* heuristic HACK */
3658 hpos = MAX (lpos, hpos - chunk);
3660 } else if (ret != GST_FLOW_OK) {
3664 if (newtime == -1 || newpos == -1) {
3665 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3669 if (G_UNLIKELY (time == G_MAXINT64)) {
3672 if (GST_CLOCK_TIME_IS_VALID (dur))
3675 } else if (newtime > time) {
3677 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3679 } else if (newtime + tolerance > time) {
3680 /* close enough undershoot */
3684 } else if (newtime < ltime) {
3685 /* so a position beyond lpos resulted in earlier time than ltime ... */
3686 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3689 /* undershoot too far */
3690 newpos += newpos == lpos ? chunk : 0;
3691 lpos = CLAMP (newpos, lpos, hpos);
3697 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3698 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3703 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3704 gboolean before, GstClockTime * _ts)
3706 gint64 bytes = 0, ts = 0;
3707 GstIndexEntry *entry = NULL;
3709 if (time == GST_CLOCK_TIME_NONE) {
3715 GST_BASE_PARSE_INDEX_LOCK (parse);
3716 if (parse->priv->index) {
3717 /* Let's check if we have an index entry for that time */
3718 entry = gst_index_get_assoc_entry (parse->priv->index,
3719 parse->priv->index_id,
3720 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3721 GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3725 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3726 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3728 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3729 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3730 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3732 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3733 GST_TIME_ARGS (time));
3736 ts = GST_CLOCK_TIME_NONE;
3739 GST_BASE_PARSE_INDEX_UNLOCK (parse);
3748 /* returns TRUE if seek succeeded */
3750 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3755 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3756 gboolean flush, update, res = TRUE, accurate;
3757 gint64 cur, stop, seekpos, seekstop;
3758 GstSegment seeksegment = { 0, };
3759 GstClockTime start_ts;
3761 gst_event_parse_seek (event, &rate, &format, &flags,
3762 &cur_type, &cur, &stop_type, &stop);
3764 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3765 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3766 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3767 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3769 /* no negative rates in push mode */
3770 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
3773 if (cur_type != GST_SEEK_TYPE_SET ||
3774 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3777 /* For any format other than TIME, see if upstream handles
3778 * it directly or fail. For TIME, try upstream, but do it ourselves if
3779 * it fails upstream */
3780 if (format != GST_FORMAT_TIME) {
3781 /* default action delegates to upstream */
3785 gst_event_ref (event);
3786 if ((res = gst_pad_push_event (parse->sinkpad, event))) {
3791 /* get flush flag */
3792 flush = flags & GST_SEEK_FLAG_FLUSH;
3794 /* copy segment, we need this because we still need the old
3795 * segment when we close the current segment. */
3796 gst_segment_copy_into (&parse->segment, &seeksegment);
3798 GST_DEBUG_OBJECT (parse, "configuring seek");
3799 gst_segment_do_seek (&seeksegment, rate, format, flags,
3800 cur_type, cur, stop_type, stop, &update);
3802 /* accurate seeking implies seek tables are used to obtain position,
3803 * and the requested segment is maintained exactly, not adjusted any way */
3804 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3806 /* maybe we can be accurate for (almost) free */
3807 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
3808 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
3809 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3813 GstClockTime startpos = seeksegment.position;
3815 /* accurate requested, so ... seek a bit before target */
3816 if (startpos < parse->priv->lead_in_ts)
3819 startpos -= parse->priv->lead_in_ts;
3820 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3821 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3824 start_ts = seeksegment.position;
3825 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.position,
3826 GST_FORMAT_BYTES, &seekpos))
3827 goto convert_failed;
3828 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3829 GST_FORMAT_BYTES, &seekstop))
3830 goto convert_failed;
3833 GST_DEBUG_OBJECT (parse,
3834 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3836 GST_DEBUG_OBJECT (parse,
3837 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3838 seeksegment.stop, seekstop);
3840 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
3843 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3846 if (parse->srcpad) {
3847 GST_DEBUG_OBJECT (parse, "sending flush start");
3848 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3849 /* unlock upstream pull_range */
3850 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3853 gst_pad_pause_task (parse->sinkpad);
3856 /* we should now be able to grab the streaming thread because we stopped it
3857 * with the above flush/pause code */
3858 GST_PAD_STREAM_LOCK (parse->sinkpad);
3860 /* save current position */
3861 last_stop = parse->segment.position;
3862 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3865 /* now commit to new position */
3867 /* prepare for streaming again */
3869 GST_DEBUG_OBJECT (parse, "sending flush stop");
3870 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop (TRUE));
3871 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop (TRUE));
3872 gst_base_parse_clear_queues (parse);
3874 /* keep track of our position */
3875 seeksegment.base = gst_segment_to_running_time (&seeksegment,
3876 seeksegment.format, parse->segment.position);
3879 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3881 /* store the newsegment event so it can be sent from the streaming thread. */
3882 if (parse->priv->pending_segment)
3883 gst_event_unref (parse->priv->pending_segment);
3885 /* This will be sent later in _loop() */
3886 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
3888 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3889 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3890 ", pos = %" GST_TIME_FORMAT, format,
3891 GST_TIME_ARGS (parse->segment.start),
3892 GST_TIME_ARGS (parse->segment.stop),
3893 GST_TIME_ARGS (parse->segment.start));
3895 /* one last chance in pull mode to stay accurate;
3896 * maybe scan and subclass can find where to go */
3899 GstClockTime ts = seeksegment.position;
3901 gst_base_parse_locate_time (parse, &ts, &scanpos);
3905 /* running collected index now consists of several intervals,
3906 * so optimized check no longer possible */
3907 parse->priv->index_last_valid = FALSE;
3908 parse->priv->index_last_offset = 0;
3909 parse->priv->index_last_ts = 0;
3913 /* mark discont if we are going to stream from another position. */
3914 if (seekpos != parse->priv->offset) {
3915 GST_DEBUG_OBJECT (parse,
3916 "mark DISCONT, we did a seek to another position");
3917 parse->priv->offset = seekpos;
3918 parse->priv->last_offset = seekpos;
3919 parse->priv->seen_keyframe = FALSE;
3920 parse->priv->discont = TRUE;
3921 parse->priv->next_ts = start_ts;
3922 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3923 parse->priv->sync_offset = seekpos;
3924 parse->priv->exact_position = accurate;
3927 /* Start streaming thread if paused */
3928 gst_pad_start_task (parse->sinkpad,
3929 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3931 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3936 GstEvent *new_event;
3937 GstBaseParseSeek *seek;
3938 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
3940 /* The only thing we need to do in PUSH-mode is to send the
3941 seek event (in bytes) to upstream. Segment / flush handling happens
3942 in corresponding src event handlers */
3943 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3944 if (seekstop >= 0 && seekstop <= seekpos)
3946 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
3947 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3949 /* store segment info so its precise details can be reconstructed when
3950 * receiving newsegment;
3951 * this matters for all details when accurate seeking,
3952 * is most useful to preserve NONE stop time otherwise */
3953 seek = g_new0 (GstBaseParseSeek, 1);
3954 seek->segment = seeksegment;
3955 seek->accurate = accurate;
3956 seek->offset = seekpos;
3957 seek->start_ts = start_ts;
3958 GST_OBJECT_LOCK (parse);
3959 /* less optimal, but preserves order */
3960 parse->priv->pending_seeks =
3961 g_slist_append (parse->priv->pending_seeks, seek);
3962 GST_OBJECT_UNLOCK (parse);
3964 res = gst_pad_push_event (parse->sinkpad, new_event);
3967 GST_OBJECT_LOCK (parse);
3968 parse->priv->pending_seeks =
3969 g_slist_remove (parse->priv->pending_seeks, seek);
3970 GST_OBJECT_UNLOCK (parse);
3976 /* handled event is ours to free */
3978 gst_event_unref (event);
3984 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
3990 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
3996 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
4002 /* Checks if bitrates are available from upstream tags so that we don't
4003 * override them later
4006 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
4008 GstTagList *taglist = NULL;
4011 gst_event_parse_tag (event, &taglist);
4013 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
4014 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
4015 parse->priv->post_min_bitrate = FALSE;
4017 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
4018 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
4019 parse->priv->post_avg_bitrate = FALSE;
4021 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
4022 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
4023 parse->priv->post_max_bitrate = FALSE;
4029 gst_base_parse_set_index (GstElement * element, GstIndex * index)
4031 GstBaseParse *parse = GST_BASE_PARSE (element);
4033 GST_BASE_PARSE_INDEX_LOCK (parse);
4034 if (parse->priv->index)
4035 gst_object_unref (parse->priv->index);
4037 parse->priv->index = gst_object_ref (index);
4038 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4039 &parse->priv->index_id);
4040 parse->priv->own_index = FALSE;
4042 parse->priv->index = NULL;
4044 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4048 gst_base_parse_get_index (GstElement * element)
4050 GstBaseParse *parse = GST_BASE_PARSE (element);
4051 GstIndex *result = NULL;
4053 GST_BASE_PARSE_INDEX_LOCK (parse);
4054 if (parse->priv->index)
4055 result = gst_object_ref (parse->priv->index);
4056 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4062 static GstStateChangeReturn
4063 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4065 GstBaseParse *parse;
4066 GstStateChangeReturn result;
4068 parse = GST_BASE_PARSE (element);
4070 switch (transition) {
4071 case GST_STATE_CHANGE_READY_TO_PAUSED:
4072 /* If this is our own index destroy it as the
4073 * old entries might be wrong for the new stream */
4074 GST_BASE_PARSE_INDEX_LOCK (parse);
4075 if (parse->priv->own_index) {
4076 gst_object_unref (parse->priv->index);
4077 parse->priv->index = NULL;
4078 parse->priv->own_index = FALSE;
4081 /* If no index was created, generate one */
4082 if (G_UNLIKELY (!parse->priv->index)) {
4083 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4085 parse->priv->index = g_object_new (gst_mem_index_get_type (), NULL);
4086 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4087 &parse->priv->index_id);
4088 parse->priv->own_index = TRUE;
4090 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4096 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4098 switch (transition) {
4099 case GST_STATE_CHANGE_PAUSED_TO_READY:
4100 gst_base_parse_reset (parse);