2 * Copyright (C) 2008 Nokia Corporation. All rights reserved.
3 * Contact: Stefan Kost <stefan.kost@nokia.com>
4 * Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
5 * Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
6 * Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
25 * SECTION:gstbaseparse
26 * @short_description: Base class for stream parsers
27 * @see_also: #GstBaseTransform
29 * This base class is for parser elements that process data and splits it
30 * into separate audio/video/whatever frames.
34 * <listitem><para>provides one sink pad and one source pad</para></listitem>
35 * <listitem><para>handles state changes</para></listitem>
36 * <listitem><para>can operate in pull mode or push mode</para></listitem>
37 * <listitem><para>handles seeking in both modes</para></listitem>
38 * <listitem><para>handles events (NEWSEGMENT/EOS/FLUSH)</para></listitem>
40 * handles queries (POSITION/DURATION/SEEKING/FORMAT/CONVERT)
42 * <listitem><para>handles flushing</para></listitem>
45 * The purpose of this base class is to provide the basic functionality of
46 * a parser and share a lot of rather complex code.
48 * Description of the parsing mechanism:
51 * <itemizedlist><title>Set-up phase</title>
53 * GstBaseParse class calls @set_sink_caps to inform the subclass about
54 * incoming sinkpad caps. Subclass should set the srcpad caps accordingly.
57 * GstBaseParse calls @start to inform subclass that data processing is
61 * At least at this point subclass needs to tell the GstBaseParse class
62 * how big data chunks it wants to receive (min_frame_size). It can do
63 * this with gst_base_parse_set_min_frame_size().
66 * GstBaseParse class sets up appropriate data passing mode (pull/push)
67 * and starts to process the data.
73 * <title>Parsing phase</title>
75 * GstBaseParse gathers at least min_frame_size bytes of data either
76 * by pulling it from upstream or collecting buffers in an internal
80 * A buffer of (at least) min_frame_size bytes is passed to subclass with
81 * @check_valid_frame. Subclass checks the contents and returns TRUE
82 * if the buffer contains a valid frame. It also needs to set the
83 * @framesize according to the detected frame size. If buffer didn't
84 * contain a valid frame, this call must return FALSE and optionally
85 * set the @skipsize value to inform base class that how many bytes
86 * it needs to skip in order to find a valid frame. @framesize can always
87 * indicate a new minimum for current frame parsing. Indicating G_MAXUINT
88 * for requested amount means subclass simply needs best available
89 * subsequent data. In push mode this amounts to an additional input buffer
90 * (thus minimal additional latency), in pull mode this amounts to some
91 * arbitrary reasonable buffer size increase. The passed buffer
92 * is read-only. Note that @check_valid_frame might receive any small
93 * amount of input data when leftover data is being drained (e.g. at EOS).
96 * After valid frame is found, it will be passed again to subclass with
97 * @parse_frame call. Now subclass is responsible for parsing the
98 * frame contents and setting the caps, and buffer metadata (e.g.
99 * buffer timestamp and duration, or keyframe if applicable).
100 * (although the latter can also be done by GstBaseParse if it is
101 * appropriately configured, see below). Frame is provided with
102 * timestamp derived from upstream (as much as generally possible),
103 * duration obtained from configuration (see below), and offset
104 * if meaningful (in pull mode).
107 * Finally the buffer can be pushed downstream and the parsing loop starts
108 * over again. Just prior to actually pushing the buffer in question,
109 * it is passed to @pre_push_frame which gives subclass yet one
110 * last chance to examine buffer metadata, or to send some custom (tag)
111 * events, or to perform custom (segment) filtering.
114 * During the parsing process GstBaseParseClass will handle both srcpad
115 * and sinkpad events. They will be passed to subclass if @event or
116 * @src_event callbacks have been provided.
121 * <itemizedlist><title>Shutdown phase</title>
123 * GstBaseParse class calls @stop to inform the subclass that data
124 * parsing will be stopped.
130 * Subclass is responsible for providing pad template caps for
131 * source and sink pads. The pads need to be named "sink" and "src". It also
132 * needs to set the fixed caps on srcpad, when the format is ensured (e.g.
133 * when base class calls subclass' @set_sink_caps function).
135 * This base class uses #GST_FORMAT_DEFAULT as a meaning of frames. So,
136 * subclass conversion routine needs to know that conversion from
137 * #GST_FORMAT_TIME to #GST_FORMAT_DEFAULT must return the
138 * frame number that can be found from the given byte position.
140 * GstBaseParse uses subclasses conversion methods also for seeking (or
141 * otherwise uses its own default one, see also below).
143 * Subclass @start and @stop functions will be called to inform the beginning
144 * and end of data processing.
146 * Things that subclass need to take care of:
148 * <listitem><para>Provide pad templates</para></listitem>
150 * Fixate the source pad caps when appropriate
153 * Inform base class how big data chunks should be retrieved. This is
154 * done with gst_base_parse_set_min_frame_size() function.
157 * Examine data chunks passed to subclass with @check_valid_frame
158 * and tell if they contain a valid frame
161 * Set the caps and timestamp to frame that is passed to subclass with
162 * @parse_frame function.
164 * <listitem><para>Provide conversion functions</para></listitem>
166 * Update the duration information with gst_base_parse_set_duration()
169 * Optionally passthrough using gst_base_parse_set_passthrough()
172 * Configure various baseparse parameters using
173 * gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
174 * and gst_base_parse_set_frame_rate().
177 * In particular, if subclass is unable to determine a duration, but
178 * parsing (or specs) yields a frames per seconds rate, then this can be
179 * provided to GstBaseParse to enable it to cater for
180 * buffer time metadata (which will be taken from upstream as much as
181 * possible). Internally keeping track of frame durations and respective
182 * sizes that have been pushed provides GstBaseParse with an estimated
183 * bitrate. A default @convert (used if not overriden) will then use these
184 * rates to perform obvious conversions. These rates are also used to
185 * update (estimated) duration at regular frame intervals.
192 * - In push mode provide a queue of adapter-"queued" buffers for upstream
194 * - Queue buffers/events until caps are set
204 #include <gst/base/gstadapter.h>
206 #include "gstbaseparse.h"
208 #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
210 #define MIN_FRAMES_TO_POST_BITRATE 10
211 #define TARGET_DIFFERENCE (20 * GST_SECOND)
213 GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
214 #define GST_CAT_DEFAULT gst_base_parse_debug
216 /* Supported formats */
217 static const GstFormat fmtlist[] = {
224 #define GST_BASE_PARSE_GET_PRIVATE(obj) \
225 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
227 struct _GstBaseParsePrivate
234 GstFormat duration_fmt;
235 gint64 estimated_duration;
236 gint64 estimated_drift;
238 guint min_frame_size;
239 gboolean passthrough;
241 gboolean has_timing_info;
242 guint fps_num, fps_den;
243 gint update_interval;
245 guint lead_in, lead_out;
246 GstClockTime lead_in_ts, lead_out_ts;
247 GstClockTime min_latency, max_latency;
255 GstClockTime next_ts;
256 GstClockTime prev_ts;
257 GstClockTime frame_duration;
258 gboolean seen_keyframe;
263 guint64 data_bytecount;
264 guint64 acc_duration;
265 GstClockTime first_frame_ts;
266 gint64 first_frame_offset;
268 gboolean post_min_bitrate;
269 gboolean post_avg_bitrate;
270 gboolean post_max_bitrate;
274 guint posted_avg_bitrate;
276 GList *pending_events;
278 /* frames/buffers that are queued and ready to go on OK */
279 GQueue queued_frames;
283 /* index entry storage, either ours or provided */
287 GStaticMutex index_lock;
289 /* seek table entries only maintained if upstream is BYTE seekable */
290 gboolean upstream_seekable;
291 gboolean upstream_has_duration;
292 gint64 upstream_size;
293 /* minimum distance between two index entries */
294 GstClockTimeDiff idx_interval;
295 /* ts and offset of last entry added */
296 GstClockTime index_last_ts;
297 gint64 index_last_offset;
298 gboolean index_last_valid;
300 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
301 gboolean exact_position;
302 /* seek events are temporarily kept to match them with newsegments */
303 GSList *pending_seeks;
305 /* reverse playback */
306 GSList *buffers_pending;
307 GSList *buffers_queued;
308 GSList *buffers_send;
309 GstClockTime last_ts;
312 /* Newsegment event to be sent after SEEK */
313 GstEvent *pending_segment;
315 /* Segment event that closes the running segment prior to SEEK */
316 GstEvent *close_segment;
318 /* push mode helper frame */
319 GstBaseParseFrame frame;
321 /* TRUE if we're still detecting the format, i.e.
322 * if ::detect() is still called for future buffers */
324 GList *detect_buffers;
325 guint detect_buffers_size;
328 typedef struct _GstBaseParseSeek
333 GstClockTime start_ts;
336 static GstElementClass *parent_class = NULL;
338 static void gst_base_parse_class_init (GstBaseParseClass * klass);
339 static void gst_base_parse_init (GstBaseParse * parse,
340 GstBaseParseClass * klass);
343 gst_base_parse_get_type (void)
345 static volatile gsize base_parse_type = 0;
347 if (g_once_init_enter (&base_parse_type)) {
348 static const GTypeInfo base_parse_info = {
349 sizeof (GstBaseParseClass),
350 (GBaseInitFunc) NULL,
351 (GBaseFinalizeFunc) NULL,
352 (GClassInitFunc) gst_base_parse_class_init,
355 sizeof (GstBaseParse),
357 (GInstanceInitFunc) gst_base_parse_init,
361 _type = g_type_register_static (GST_TYPE_ELEMENT,
362 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
363 g_once_init_leave (&base_parse_type, _type);
365 return (GType) base_parse_type;
368 static void gst_base_parse_finalize (GObject * object);
370 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
371 GstStateChange transition);
372 static void gst_base_parse_reset (GstBaseParse * parse);
374 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
375 static GstIndex *gst_base_parse_get_index (GstElement * element);
377 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
379 static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
380 GstObject * parent, GstPadMode mode, gboolean active);
381 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
383 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
385 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
387 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
390 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
392 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
395 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
397 static void gst_base_parse_loop (GstPad * pad);
399 static gboolean gst_base_parse_check_frame (GstBaseParse * parse,
400 GstBaseParseFrame * frame, guint * framesize, gint * skipsize);
401 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
402 GstBaseParseFrame * frame);
404 static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse,
407 static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse,
410 static void gst_base_parse_drain (GstBaseParse * parse);
412 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
413 gboolean post_min, gboolean post_avg, gboolean post_max);
415 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
416 GstClockTime time, gboolean before, GstClockTime * _ts);
417 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
418 GstClockTime * _time, gint64 * _offset);
420 static GstFlowReturn gst_base_parse_process_fragment (GstBaseParse * parse,
423 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
426 gst_base_parse_clear_queues (GstBaseParse * parse)
428 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
429 g_slist_free (parse->priv->buffers_queued);
430 parse->priv->buffers_queued = NULL;
431 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
433 g_slist_free (parse->priv->buffers_pending);
434 parse->priv->buffers_pending = NULL;
435 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
436 g_slist_free (parse->priv->buffers_send);
437 parse->priv->buffers_send = NULL;
439 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
440 g_list_free (parse->priv->detect_buffers);
441 parse->priv->detect_buffers = NULL;
442 parse->priv->detect_buffers_size = 0;
446 gst_base_parse_finalize (GObject * object)
448 GstBaseParse *parse = GST_BASE_PARSE (object);
451 g_object_unref (parse->priv->adapter);
453 if (parse->priv->pending_segment) {
454 p_ev = &parse->priv->pending_segment;
455 gst_event_replace (p_ev, NULL);
457 if (parse->priv->close_segment) {
458 p_ev = &parse->priv->close_segment;
459 gst_event_replace (p_ev, NULL);
462 if (parse->priv->cache) {
463 gst_buffer_unref (parse->priv->cache);
464 parse->priv->cache = NULL;
467 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
469 g_list_free (parse->priv->pending_events);
470 parse->priv->pending_events = NULL;
472 g_queue_foreach (&parse->priv->queued_frames,
473 (GFunc) gst_base_parse_frame_free, NULL);
474 g_queue_clear (&parse->priv->queued_frames);
476 if (parse->priv->index) {
477 gst_object_unref (parse->priv->index);
478 parse->priv->index = NULL;
481 g_static_mutex_free (&parse->priv->index_lock);
483 gst_base_parse_clear_queues (parse);
485 G_OBJECT_CLASS (parent_class)->finalize (object);
489 gst_base_parse_class_init (GstBaseParseClass * klass)
491 GObjectClass *gobject_class;
492 GstElementClass *gstelement_class;
494 gobject_class = G_OBJECT_CLASS (klass);
495 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
496 parent_class = g_type_class_peek_parent (klass);
497 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
499 gstelement_class = (GstElementClass *) klass;
500 gstelement_class->change_state =
501 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
502 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
503 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
505 /* Default handlers */
506 klass->check_valid_frame = gst_base_parse_check_frame;
507 klass->parse_frame = gst_base_parse_parse_frame;
508 klass->src_event = gst_base_parse_src_eventfunc;
509 klass->convert = gst_base_parse_convert_default;
511 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
512 "baseparse element");
516 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
518 GstPadTemplate *pad_template;
520 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
522 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
525 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
526 g_return_if_fail (pad_template != NULL);
527 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
528 gst_pad_set_event_function (parse->sinkpad,
529 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
530 gst_pad_set_query_function (parse->sinkpad,
531 GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
532 gst_pad_set_chain_function (parse->sinkpad,
533 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
534 gst_pad_set_activate_function (parse->sinkpad,
535 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
536 gst_pad_set_activatemode_function (parse->sinkpad,
537 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
538 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
540 GST_DEBUG_OBJECT (parse, "sinkpad created");
543 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
544 g_return_if_fail (pad_template != NULL);
545 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
546 gst_pad_set_event_function (parse->srcpad,
547 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
548 gst_pad_set_query_function (parse->srcpad,
549 GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
550 gst_pad_use_fixed_caps (parse->srcpad);
551 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
552 GST_DEBUG_OBJECT (parse, "src created");
554 g_queue_init (&parse->priv->queued_frames);
556 parse->priv->adapter = gst_adapter_new ();
558 parse->priv->pad_mode = GST_PAD_MODE_NONE;
560 g_static_mutex_init (&parse->priv->index_lock);
563 gst_base_parse_reset (parse);
564 GST_DEBUG_OBJECT (parse, "init ok");
567 static GstBaseParseFrame *
568 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
570 GstBaseParseFrame *copy;
572 copy = g_slice_dup (GstBaseParseFrame, frame);
573 copy->buffer = gst_buffer_ref (frame->buffer);
574 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
576 GST_TRACE ("copied frame %p -> %p", frame, copy);
582 gst_base_parse_frame_free (GstBaseParseFrame * frame)
584 GST_TRACE ("freeing frame %p", frame);
587 gst_buffer_unref (frame->buffer);
588 frame->buffer = NULL;
591 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
592 g_slice_free (GstBaseParseFrame, frame);
594 memset (frame, 0, sizeof (*frame));
599 gst_base_parse_frame_get_type (void)
601 static volatile gsize frame_type = 0;
603 if (g_once_init_enter (&frame_type)) {
606 _type = g_boxed_type_register_static ("GstBaseParseFrame",
607 (GBoxedCopyFunc) gst_base_parse_frame_copy,
608 (GBoxedFreeFunc) gst_base_parse_frame_free);
609 g_once_init_leave (&frame_type, _type);
611 return (GType) frame_type;
615 * gst_base_parse_frame_init:
616 * @frame: #GstBaseParseFrame.
618 * Sets a #GstBaseParseFrame to initial state. Currently this means
619 * all public fields are zero-ed and a private flag is set to make
620 * sure gst_base_parse_frame_free() only frees the contents but not
621 * the actual frame. Use this function to initialise a #GstBaseParseFrame
622 * allocated on the stack.
627 gst_base_parse_frame_init (GstBaseParseFrame * frame)
629 memset (frame, 0, sizeof (GstBaseParseFrame));
630 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
631 GST_TRACE ("inited frame %p", frame);
635 * gst_base_parse_frame_new:
636 * @buffer: (transfer none): a #GstBuffer
638 * @overhead: number of bytes in this frame which should be counted as
639 * metadata overhead, ie. not used to calculate the average bitrate.
640 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
642 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
643 * elements written in C should usually allocate the frame on the stack and
644 * then use gst_base_parse_frame_init() to initialise it.
646 * Returns: a newly-allocated #GstBaseParseFrame. Free with
647 * gst_base_parse_frame_free() when no longer needed, unless you gave
648 * away ownership to gst_base_parse_push_frame().
653 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
656 GstBaseParseFrame *frame;
658 frame = g_slice_new0 (GstBaseParseFrame);
659 frame->buffer = gst_buffer_ref (buffer);
661 GST_TRACE ("created frame %p", frame);
666 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
669 gst_buffer_replace (&frame->buffer, buf);
673 /* set flags one by one for clarity */
674 if (G_UNLIKELY (parse->priv->drain))
675 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
677 /* losing sync is pretty much a discont (and vice versa), no ? */
678 if (G_UNLIKELY (parse->priv->discont))
679 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
683 gst_base_parse_reset (GstBaseParse * parse)
685 GST_OBJECT_LOCK (parse);
686 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
687 parse->priv->duration = -1;
688 parse->priv->min_frame_size = 1;
689 parse->priv->discont = TRUE;
690 parse->priv->flushing = FALSE;
691 parse->priv->offset = 0;
692 parse->priv->sync_offset = 0;
693 parse->priv->update_interval = -1;
694 parse->priv->fps_num = parse->priv->fps_den = 0;
695 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
696 parse->priv->lead_in = parse->priv->lead_out = 0;
697 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
698 parse->priv->bitrate = 0;
699 parse->priv->framecount = 0;
700 parse->priv->bytecount = 0;
701 parse->priv->acc_duration = 0;
702 parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE;
703 parse->priv->first_frame_offset = -1;
704 parse->priv->estimated_duration = -1;
705 parse->priv->estimated_drift = 0;
706 parse->priv->next_ts = 0;
707 parse->priv->syncable = TRUE;
708 parse->priv->passthrough = FALSE;
709 parse->priv->has_timing_info = FALSE;
710 parse->priv->post_min_bitrate = TRUE;
711 parse->priv->post_avg_bitrate = TRUE;
712 parse->priv->post_max_bitrate = TRUE;
713 parse->priv->min_bitrate = G_MAXUINT;
714 parse->priv->max_bitrate = 0;
715 parse->priv->avg_bitrate = 0;
716 parse->priv->posted_avg_bitrate = 0;
718 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
719 parse->priv->index_last_offset = -1;
720 parse->priv->index_last_valid = TRUE;
721 parse->priv->upstream_seekable = FALSE;
722 parse->priv->upstream_size = 0;
723 parse->priv->upstream_has_duration = FALSE;
724 parse->priv->idx_interval = 0;
725 parse->priv->exact_position = TRUE;
726 parse->priv->seen_keyframe = FALSE;
728 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
729 parse->priv->last_offset = 0;
731 if (parse->priv->pending_segment) {
732 gst_event_unref (parse->priv->pending_segment);
733 parse->priv->pending_segment = NULL;
736 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
738 g_list_free (parse->priv->pending_events);
739 parse->priv->pending_events = NULL;
741 if (parse->priv->cache) {
742 gst_buffer_unref (parse->priv->cache);
743 parse->priv->cache = NULL;
746 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
747 g_slist_free (parse->priv->pending_seeks);
748 parse->priv->pending_seeks = NULL;
750 /* we know it is not alloc'ed, but maybe other stuff to free, some day ... */
751 parse->priv->frame._private_flags |=
752 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
753 gst_base_parse_frame_free (&parse->priv->frame);
755 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
756 g_list_free (parse->priv->detect_buffers);
757 parse->priv->detect_buffers = NULL;
758 parse->priv->detect_buffers_size = 0;
759 GST_OBJECT_UNLOCK (parse);
762 /* gst_base_parse_check_frame:
763 * @parse: #GstBaseParse.
764 * @buffer: GstBuffer.
765 * @framesize: This will be set to tell the found frame size in bytes.
766 * @skipsize: Output parameter that tells how much data needs to be skipped
767 * in order to find the following frame header.
769 * Default callback for check_valid_frame.
771 * Returns: Always TRUE.
774 gst_base_parse_check_frame (GstBaseParse * parse,
775 GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
777 *framesize = gst_buffer_get_size (frame->buffer);
783 /* gst_base_parse_parse_frame:
784 * @parse: #GstBaseParse.
785 * @buffer: #GstBuffer.
787 * Default callback for parse_frame.
790 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
792 GstBuffer *buffer = frame->buffer;
794 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
795 GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) {
796 GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts;
798 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
799 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
800 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
805 /* gst_base_parse_convert:
806 * @parse: #GstBaseParse.
807 * @src_format: #GstFormat describing the source format.
808 * @src_value: Source value to be converted.
809 * @dest_format: #GstFormat defining the converted format.
810 * @dest_value: Pointer where the conversion result will be put.
812 * Converts using configured "convert" vmethod in #GstBaseParse class.
814 * Returns: TRUE if conversion was successful.
817 gst_base_parse_convert (GstBaseParse * parse,
818 GstFormat src_format,
819 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
821 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
824 g_return_val_if_fail (dest_value != NULL, FALSE);
829 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
831 #ifndef GST_DISABLE_GST_DEBUG
834 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
835 GST_LOG_OBJECT (parse,
836 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
837 GST_TIME_ARGS (src_value), *dest_value);
838 } else if (dest_format == GST_FORMAT_TIME &&
839 src_format == GST_FORMAT_BYTES) {
840 GST_LOG_OBJECT (parse,
841 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
842 src_value, GST_TIME_ARGS (*dest_value));
844 GST_LOG_OBJECT (parse,
845 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
846 GST_STR_NULL (gst_format_get_name (src_format)),
847 GST_STR_NULL (gst_format_get_name (dest_format)),
848 src_value, *dest_value);
851 GST_DEBUG_OBJECT (parse, "conversion failed");
859 /* gst_base_parse_sink_event:
860 * @pad: #GstPad that received the event.
861 * @event: #GstEvent to be handled.
863 * Handler for sink pad events.
865 * Returns: TRUE if the event was handled.
868 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
871 GstBaseParseClass *bclass;
872 gboolean handled = FALSE;
875 parse = GST_BASE_PARSE (parent);
876 bclass = GST_BASE_PARSE_GET_CLASS (parse);
878 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
879 GST_EVENT_TYPE_NAME (event));
881 /* Cache all events except EOS, SEGMENT and FLUSH_STOP if we have a
883 if (parse->priv->pending_segment && GST_EVENT_TYPE (event) != GST_EVENT_EOS
884 && GST_EVENT_TYPE (event) != GST_EVENT_SEGMENT
885 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
886 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP) {
888 if (GST_EVENT_TYPE (event) == GST_EVENT_TAG)
889 /* See if any bitrate tags were posted */
890 gst_base_parse_handle_tag (parse, event);
892 parse->priv->pending_events =
893 g_list_append (parse->priv->pending_events, event);
897 if (GST_EVENT_TYPE (event) == GST_EVENT_EOS &&
898 parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
899 /* We've not posted bitrate tags yet - do so now */
900 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
903 handled = bclass->event (parse, event);
906 handled = gst_base_parse_sink_eventfunc (parse, event);
909 ret = gst_pad_event_default (pad, parent, event);
912 GST_DEBUG_OBJECT (parse, "event handled");
918 /* gst_base_parse_sink_eventfunc:
919 * @parse: #GstBaseParse.
920 * @event: #GstEvent to be handled.
922 * Element-level event handler function.
924 * The event will be unreffed only if it has been handled and this
925 * function returns %TRUE
927 * Returns: %TRUE if the event was handled and not need forwarding.
930 gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event)
932 gboolean handled = FALSE;
935 switch (GST_EVENT_TYPE (event)) {
939 GstBaseParseClass *klass;
941 klass = GST_BASE_PARSE_GET_CLASS (parse);
943 gst_event_parse_caps (event, &caps);
944 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
946 if (klass->set_sink_caps)
947 klass->set_sink_caps (parse, caps);
949 /* will send our own caps downstream */
950 gst_event_unref (event);
954 case GST_EVENT_SEGMENT:
956 const GstSegment *in_segment;
957 GstSegment out_segment;
958 gint64 offset = 0, next_ts;
961 gdouble rate, applied_rate;
963 gint64 start, stop, pos, next_ts;
967 gst_event_parse_segment (event, &in_segment);
968 gst_segment_init (&out_segment, GST_FORMAT_TIME);
970 GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
972 if (in_segment->format == GST_FORMAT_BYTES) {
973 GstBaseParseSeek *seek = NULL;
976 /* stop time is allowed to be open-ended, but not start & pos */
977 offset = in_segment->time;
979 GST_OBJECT_LOCK (parse);
980 for (node = parse->priv->pending_seeks; node; node = node->next) {
981 GstBaseParseSeek *tmp = node->data;
983 if (tmp->offset == offset) {
988 parse->priv->pending_seeks =
989 g_slist_remove (parse->priv->pending_seeks, seek);
990 GST_OBJECT_UNLOCK (parse);
993 GST_DEBUG_OBJECT (parse,
994 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
995 seek->accurate ? " accurate" : "", &seek->segment);
997 out_segment.start = seek->segment.start;
998 out_segment.stop = seek->segment.stop;
999 out_segment.time = seek->segment.start;
1001 next_ts = seek->start_ts;
1002 parse->priv->exact_position = seek->accurate;
1005 /* best attempt convert */
1006 /* as these are only estimates, stop is kept open-ended to avoid
1007 * premature cutting */
1008 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
1009 GST_FORMAT_TIME, (gint64 *) & next_ts);
1011 out_segment.start = next_ts;
1012 out_segment.stop = GST_CLOCK_TIME_NONE;
1013 out_segment.time = next_ts;
1015 parse->priv->exact_position = (in_segment->start == 0);
1018 gst_event_unref (event);
1020 event = gst_event_new_segment (&out_segment);
1022 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1023 GST_SEGMENT_FORMAT, in_segment);
1025 } else if (in_segment->format != GST_FORMAT_TIME) {
1026 /* Unknown incoming segment format. Output a default open-ended
1028 gst_event_unref (event);
1030 out_segment.start = 0;
1031 out_segment.stop = GST_CLOCK_TIME_NONE;;
1032 out_segment.time = 0;;
1034 event = gst_event_new_segment (&out_segment);
1038 /* not considered BYTE seekable if it is talking to us in TIME,
1039 * whatever else it might claim */
1040 parse->priv->upstream_seekable = FALSE;
1041 next_ts = in_segment->start;
1044 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1047 gst_segment_set_newsegment (&parse->segment, update, rate,
1048 applied_rate, format, start, stop, start);
1051 /* save the segment for later, right before we push a new buffer so that
1052 * the caps are fixed and the next linked element can receive
1054 eventp = &parse->priv->pending_segment;
1055 gst_event_replace (eventp, event);
1056 gst_event_unref (event);
1059 /* but finish the current segment */
1060 GST_DEBUG_OBJECT (parse, "draining current segment");
1061 if (in_segment->rate > 0.0)
1062 gst_base_parse_drain (parse);
1064 gst_base_parse_process_fragment (parse, FALSE);
1065 gst_adapter_clear (parse->priv->adapter);
1067 parse->priv->offset = offset;
1068 parse->priv->sync_offset = offset;
1069 parse->priv->next_ts = next_ts;
1070 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1071 parse->priv->discont = TRUE;
1072 parse->priv->seen_keyframe = FALSE;
1076 case GST_EVENT_FLUSH_START:
1077 parse->priv->flushing = TRUE;
1078 handled = gst_pad_push_event (parse->srcpad, gst_event_ref (event));
1080 gst_event_unref (event);
1081 /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
1082 GST_PAD_STREAM_LOCK (parse->srcpad);
1083 GST_PAD_STREAM_UNLOCK (parse->srcpad);
1087 case GST_EVENT_FLUSH_STOP:
1088 gst_adapter_clear (parse->priv->adapter);
1089 gst_base_parse_clear_queues (parse);
1090 parse->priv->flushing = FALSE;
1091 parse->priv->discont = TRUE;
1092 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1093 parse->priv->frame._private_flags |=
1094 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
1095 gst_base_parse_frame_free (&parse->priv->frame);
1099 if (parse->segment.rate > 0.0)
1100 gst_base_parse_drain (parse);
1102 gst_base_parse_process_fragment (parse, FALSE);
1104 /* If we STILL have zero frames processed, fire an error */
1105 if (parse->priv->framecount == 0) {
1106 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1107 ("No valid frames found before end of stream"), (NULL));
1109 /* newsegment before eos */
1110 if (parse->priv->pending_segment) {
1111 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
1112 parse->priv->pending_segment = NULL;
1124 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1126 GstBaseParse *parse;
1127 GstBaseParseClass *bclass;
1130 parse = GST_BASE_PARSE (parent);
1131 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1133 switch (GST_QUERY_TYPE (query)) {
1134 case GST_QUERY_CAPS:
1136 if (bclass->get_sink_caps) {
1137 GstCaps *caps, *filter;
1139 gst_query_parse_caps (query, &filter);
1140 caps = bclass->get_sink_caps (parse, filter);
1141 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1143 gst_query_set_caps_result (query, caps);
1144 gst_caps_unref (caps);
1148 res = gst_pad_peer_query (parse->srcpad, query);
1153 res = gst_pad_query_default (pad, parent, query);
1162 /* gst_base_parse_src_event:
1163 * @pad: #GstPad that received the event.
1164 * @event: #GstEvent that was received.
1166 * Handler for source pad events.
1168 * Returns: TRUE if the event was handled.
1171 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1173 GstBaseParse *parse;
1174 GstBaseParseClass *bclass;
1175 gboolean handled = FALSE;
1176 gboolean ret = TRUE;
1178 parse = GST_BASE_PARSE (parent);
1179 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1181 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1182 GST_EVENT_TYPE_NAME (event));
1184 if (bclass->src_event)
1185 handled = bclass->src_event (parse, event);
1188 ret = gst_pad_event_default (pad, parent, event);
1194 gst_base_parse_is_seekable (GstBaseParse * parse)
1196 /* FIXME: could do more here, e.g. check index or just send data from 0
1197 * in pull mode and let decoder/sink clip */
1198 return parse->priv->syncable;
1201 /* gst_base_parse_src_eventfunc:
1202 * @parse: #GstBaseParse.
1203 * @event: #GstEvent that was received.
1205 * Default srcpad event handler.
1207 * Returns: TRUE if the event was handled and can be dropped.
1210 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1212 gboolean handled = FALSE;
1214 switch (GST_EVENT_TYPE (event)) {
1215 case GST_EVENT_SEEK:
1217 if (gst_base_parse_is_seekable (parse)) {
1218 handled = gst_base_parse_handle_seek (parse, event);
1230 * gst_base_parse_convert_default:
1231 * @parse: #GstBaseParse.
1232 * @src_format: #GstFormat describing the source format.
1233 * @src_value: Source value to be converted.
1234 * @dest_format: #GstFormat defining the converted format.
1235 * @dest_value: Pointer where the conversion result will be put.
1237 * Default implementation of "convert" vmethod in #GstBaseParse class.
1239 * Returns: TRUE if conversion was successful.
1244 gst_base_parse_convert_default (GstBaseParse * parse,
1245 GstFormat src_format,
1246 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1248 gboolean ret = FALSE;
1249 guint64 bytes, duration;
1251 if (G_UNLIKELY (src_format == dest_format)) {
1252 *dest_value = src_value;
1256 if (G_UNLIKELY (src_value == -1)) {
1261 if (G_UNLIKELY (src_value == 0)) {
1266 /* need at least some frames */
1267 if (!parse->priv->framecount)
1270 duration = parse->priv->acc_duration / GST_MSECOND;
1271 bytes = parse->priv->bytecount;
1273 if (G_UNLIKELY (!duration || !bytes))
1276 if (src_format == GST_FORMAT_BYTES) {
1277 if (dest_format == GST_FORMAT_TIME) {
1278 /* BYTES -> TIME conversion */
1279 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1280 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1281 *dest_value *= GST_MSECOND;
1282 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1283 *dest_value / GST_MSECOND);
1286 } else if (src_format == GST_FORMAT_TIME) {
1287 if (dest_format == GST_FORMAT_BYTES) {
1288 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1289 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1291 GST_DEBUG_OBJECT (parse,
1292 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1293 src_value / GST_MSECOND, *dest_value);
1296 } else if (src_format == GST_FORMAT_DEFAULT) {
1297 /* DEFAULT == frame-based */
1298 if (dest_format == GST_FORMAT_TIME) {
1299 if (parse->priv->fps_den) {
1300 *dest_value = gst_util_uint64_scale (src_value,
1301 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1304 } else if (dest_format == GST_FORMAT_BYTES) {
1312 gst_base_parse_update_duration (GstBaseParse * baseparse)
1315 GstBaseParse *parse;
1317 parse = GST_BASE_PARSE (baseparse);
1319 peer = gst_pad_get_peer (parse->sinkpad);
1321 gboolean qres = FALSE;
1322 gint64 ptot, dest_value;
1324 qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot);
1325 gst_object_unref (GST_OBJECT (peer));
1327 if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1328 GST_FORMAT_TIME, &dest_value)) {
1330 /* inform if duration changed, but try to avoid spamming */
1331 parse->priv->estimated_drift +=
1332 dest_value - parse->priv->estimated_duration;
1333 if (parse->priv->estimated_drift > GST_SECOND ||
1334 parse->priv->estimated_drift < -GST_SECOND) {
1335 gst_element_post_message (GST_ELEMENT (parse),
1336 gst_message_new_duration (GST_OBJECT (parse),
1337 GST_FORMAT_TIME, dest_value));
1338 parse->priv->estimated_drift = 0;
1340 parse->priv->estimated_duration = dest_value;
1341 GST_LOG_OBJECT (parse,
1342 "updated estimated duration to %" GST_TIME_FORMAT,
1343 GST_TIME_ARGS (dest_value));
1350 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1351 gboolean post_avg, gboolean post_max)
1353 GstTagList *taglist = NULL;
1355 if (post_min && parse->priv->post_min_bitrate) {
1356 taglist = gst_tag_list_new_empty ();
1358 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1359 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1362 if (post_avg && parse->priv->post_avg_bitrate) {
1363 if (taglist == NULL)
1364 taglist = gst_tag_list_new_empty ();
1366 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1367 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1368 parse->priv->avg_bitrate, NULL);
1371 if (post_max && parse->priv->post_max_bitrate) {
1372 if (taglist == NULL)
1373 taglist = gst_tag_list_new_empty ();
1375 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1376 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1379 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1380 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1381 parse->priv->max_bitrate);
1383 if (taglist != NULL) {
1384 gst_pad_push_event (parse->srcpad, gst_event_new_tag (taglist));
1388 /* gst_base_parse_update_bitrates:
1389 * @parse: #GstBaseParse.
1390 * @buffer: Current frame as a #GstBuffer
1392 * Keeps track of the minimum and maximum bitrates, and also maintains a
1393 * running average bitrate of the stream so far.
1396 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1398 /* Only update the tag on a 10 kbps delta */
1399 static const gint update_threshold = 10000;
1401 guint64 data_len, frame_dur;
1402 gint overhead, frame_bitrate, old_avg_bitrate;
1403 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1404 GstBuffer *buffer = frame->buffer;
1406 overhead = frame->overhead;
1410 data_len = gst_buffer_get_size (buffer) - overhead;
1411 parse->priv->data_bytecount += data_len;
1413 /* duration should be valid by now,
1414 * either set by subclass or maybe based on fps settings */
1415 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1416 /* Calculate duration of a frame from buffer properties */
1417 frame_dur = GST_BUFFER_DURATION (buffer);
1418 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1419 parse->priv->acc_duration;
1422 /* No way to figure out frame duration (is this even possible?) */
1426 /* override if subclass provided bitrate, e.g. metadata based */
1427 if (parse->priv->bitrate) {
1428 parse->priv->avg_bitrate = parse->priv->bitrate;
1429 /* spread this (confirmed) info ASAP */
1430 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1431 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1435 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1439 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1440 parse->priv->avg_bitrate);
1442 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1444 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1445 /* always post all at threshold time */
1446 update_min = update_max = update_avg = TRUE;
1449 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1450 if (frame_bitrate < parse->priv->min_bitrate) {
1451 parse->priv->min_bitrate = frame_bitrate;
1455 if (frame_bitrate > parse->priv->max_bitrate) {
1456 parse->priv->max_bitrate = frame_bitrate;
1460 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1461 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1462 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1467 if ((update_min || update_avg || update_max))
1468 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1470 /* If average bitrate changes that much and no valid (time) duration provided,
1471 * then post a new duration message so applications can update their cached
1473 if (update_avg && !(parse->priv->duration_fmt == GST_FORMAT_TIME &&
1474 GST_CLOCK_TIME_IS_VALID (parse->priv->duration)))
1475 gst_element_post_message (GST_ELEMENT (parse),
1476 gst_message_new_duration (GST_OBJECT (parse), GST_FORMAT_TIME, -1));
1483 * gst_base_parse_add_index_entry:
1484 * @parse: #GstBaseParse.
1485 * @offset: offset of entry
1486 * @ts: timestamp associated with offset
1487 * @key: whether entry refers to keyframe
1488 * @force: add entry disregarding sanity checks
1490 * Adds an entry to the index associating @offset to @ts. It is recommended
1491 * to only add keyframe entries. @force allows to bypass checks, such as
1492 * whether the stream is (upstream) seekable, another entry is already "close"
1493 * to the new entry, etc.
1495 * Returns: #gboolean indicating whether entry was added
1500 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1501 GstClockTime ts, gboolean key, gboolean force)
1503 gboolean ret = FALSE;
1504 GstIndexAssociation associations[2];
1506 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1507 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1509 if (G_LIKELY (!force)) {
1511 if (!parse->priv->upstream_seekable) {
1512 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1516 /* FIXME need better helper data structure that handles these issues
1517 * related to ongoing collecting of index entries */
1518 if (parse->priv->index_last_offset >= (gint64) offset) {
1519 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1520 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1524 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1525 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1526 parse->priv->idx_interval) {
1527 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1528 GST_TIME_ARGS (parse->priv->index_last_ts));
1532 /* if last is not really the last one */
1533 if (!parse->priv->index_last_valid) {
1534 GstClockTime prev_ts;
1536 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1537 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1538 GST_DEBUG_OBJECT (parse,
1539 "entry too close to existing entry %" GST_TIME_FORMAT,
1540 GST_TIME_ARGS (prev_ts));
1541 parse->priv->index_last_offset = offset;
1542 parse->priv->index_last_ts = ts;
1548 associations[0].format = GST_FORMAT_TIME;
1549 associations[0].value = ts;
1550 associations[1].format = GST_FORMAT_BYTES;
1551 associations[1].value = offset;
1553 /* index might change on-the-fly, although that would be nutty app ... */
1554 g_static_mutex_lock (&parse->priv->index_lock);
1555 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1556 (key) ? GST_ASSOCIATION_FLAG_KEY_UNIT : GST_ASSOCIATION_FLAG_DELTA_UNIT,
1557 2, (const GstIndexAssociation *) &associations);
1558 g_static_mutex_unlock (&parse->priv->index_lock);
1561 parse->priv->index_last_offset = offset;
1562 parse->priv->index_last_ts = ts;
1571 /* check for seekable upstream, above and beyond a mere query */
1573 gst_base_parse_check_seekability (GstBaseParse * parse)
1576 gboolean seekable = FALSE;
1577 gint64 start = -1, stop = -1;
1578 guint idx_interval = 0;
1580 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1581 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1582 GST_DEBUG_OBJECT (parse, "seeking query failed");
1586 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1588 /* try harder to query upstream size if we didn't get it the first time */
1589 if (seekable && stop == -1) {
1590 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1591 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1594 /* if upstream doesn't know the size, it's likely that it's not seekable in
1595 * practice even if it technically may be seekable */
1596 if (seekable && (start != 0 || stop <= start)) {
1597 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1601 /* let's not put every single frame into our index */
1603 if (stop < 10 * 1024 * 1024)
1605 else if (stop < 100 * 1024 * 1024)
1608 idx_interval = 1000;
1612 gst_query_unref (query);
1614 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1615 G_GUINT64_FORMAT ")", seekable, start, stop);
1616 parse->priv->upstream_seekable = seekable;
1617 parse->priv->upstream_size = seekable ? stop : 0;
1619 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1620 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1623 /* some misc checks on upstream */
1625 gst_base_parse_check_upstream (GstBaseParse * parse)
1629 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
1630 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1631 /* upstream has one, accept it also, and no further updates */
1632 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1633 parse->priv->upstream_has_duration = TRUE;
1636 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1637 parse->priv->upstream_has_duration);
1640 /* checks src caps to determine if dealing with audio or video */
1641 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1643 gst_base_parse_check_media (GstBaseParse * parse)
1648 caps = gst_pad_get_current_caps (parse->srcpad);
1649 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1650 parse->priv->is_video =
1651 g_str_has_prefix (gst_structure_get_name (s), "video");
1653 /* historical default */
1654 parse->priv->is_video = FALSE;
1657 gst_caps_unref (caps);
1659 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1662 /* takes ownership of frame */
1664 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1666 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1667 /* frame allocated on the heap, we can just take ownership */
1668 g_queue_push_tail (&parse->priv->queued_frames, frame);
1669 GST_TRACE ("queued frame %p", frame);
1671 GstBaseParseFrame *copy;
1673 /* probably allocated on the stack, must make a proper copy */
1674 copy = gst_base_parse_frame_copy (frame);
1675 g_queue_push_tail (&parse->priv->queued_frames, copy);
1676 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1677 gst_base_parse_frame_free (frame);
1681 /* gst_base_parse_handle_and_push_buffer:
1682 * @parse: #GstBaseParse.
1683 * @klass: #GstBaseParseClass.
1684 * @frame: (transfer full): a #GstBaseParseFrame
1686 * Parses the frame from given buffer and pushes it forward. Also performs
1687 * timestamp handling and checks the segment limits.
1689 * This is called with srcpad STREAM_LOCK held.
1691 * Returns: #GstFlowReturn
1693 static GstFlowReturn
1694 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1695 GstBaseParseClass * klass, GstBaseParseFrame * frame)
1701 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1703 buffer = frame->buffer;
1705 if (parse->priv->discont) {
1706 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1707 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1708 parse->priv->discont = FALSE;
1711 /* some one-time start-up */
1712 if (G_UNLIKELY (!parse->priv->framecount)) {
1713 gst_base_parse_check_seekability (parse);
1714 gst_base_parse_check_upstream (parse);
1717 GST_LOG_OBJECT (parse,
1718 "parsing frame at offset %" G_GUINT64_FORMAT
1719 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
1720 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1721 gst_buffer_get_size (buffer));
1723 /* use default handler to provide initial (upstream) metadata */
1724 gst_base_parse_parse_frame (parse, frame);
1726 /* store offset as it might get overwritten */
1727 offset = GST_BUFFER_OFFSET (buffer);
1728 ret = klass->parse_frame (parse, frame);
1730 buffer = frame->buffer;
1731 /* subclass must play nice */
1732 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1734 /* check if subclass/format can provide ts.
1735 * If so, that allows and enables extra seek and duration determining options */
1736 if (G_UNLIKELY (parse->priv->first_frame_offset < 0 && ret == GST_FLOW_OK)) {
1737 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1738 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1739 parse->priv->first_frame_offset = offset;
1740 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1741 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1742 " for first frame at offset %" G_GINT64_FORMAT,
1743 GST_TIME_ARGS (parse->priv->first_frame_ts),
1744 parse->priv->first_frame_offset);
1745 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1747 GstClockTime last_ts = G_MAXINT64;
1749 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1750 gst_base_parse_locate_time (parse, &last_ts, &off);
1751 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1752 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1755 /* disable further checks */
1756 parse->priv->first_frame_offset = 0;
1760 /* again use default handler to add missing metadata;
1761 * we may have new information on frame properties */
1762 gst_base_parse_parse_frame (parse, frame);
1763 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1764 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1765 parse->priv->next_ts =
1766 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1768 /* we lost track, do not produce bogus time next time around
1769 * (probably means parser subclass has given up on parsing as well) */
1770 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1771 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1774 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1775 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1776 gst_base_parse_add_index_entry (parse, offset,
1777 GST_BUFFER_TIMESTAMP (buffer),
1778 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1780 /* First buffers are dropped, this means that the subclass needs more
1781 * frames to decide on the format and queues them internally */
1782 /* convert internal flow to OK and mark discont for the next buffer. */
1783 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1784 gst_base_parse_frame_free (frame);
1786 } else if (ret == GST_BASE_PARSE_FLOW_QUEUED) {
1787 gst_base_parse_queue_frame (parse, frame);
1789 } else if (ret != GST_FLOW_OK) {
1793 /* All OK, push queued frames if there are any */
1794 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1795 GstBaseParseFrame *queued_frame;
1797 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1798 gst_base_parse_push_frame (parse, queued_frame);
1802 return gst_base_parse_push_frame (parse, frame);
1806 * gst_base_parse_push_frame:
1807 * @parse: #GstBaseParse.
1808 * @frame: (transfer full): a #GstBaseParseFrame
1810 * Pushes the frame downstream, sends any pending events and
1811 * does some timestamp and segment handling. Takes ownership
1812 * of @frame and will clear it (if it was initialised with
1813 * gst_base_parse_frame_init()) or free it.
1815 * This must be called with sinkpad STREAM_LOCK held.
1817 * Returns: #GstFlowReturn
1822 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1824 GstFlowReturn ret = GST_FLOW_OK;
1825 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1826 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1827 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1831 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1832 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1834 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1836 buffer = frame->buffer;
1838 GST_LOG_OBJECT (parse,
1839 "processing buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT
1840 ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer),
1841 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1842 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1845 size = gst_buffer_get_size (buffer);
1846 parse->priv->bytecount += size;
1847 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1848 parse->priv->framecount++;
1849 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1850 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1853 /* 0 means disabled */
1854 if (parse->priv->update_interval < 0)
1855 parse->priv->update_interval = 50;
1856 else if (parse->priv->update_interval > 0 &&
1857 (parse->priv->framecount % parse->priv->update_interval) == 0)
1858 gst_base_parse_update_duration (parse);
1860 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1861 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1862 if (last_start != GST_CLOCK_TIME_NONE
1863 && GST_BUFFER_DURATION_IS_VALID (buffer))
1864 last_stop = last_start + GST_BUFFER_DURATION (buffer);
1866 /* should have caps by now */
1867 g_return_val_if_fail (gst_pad_has_current_caps (parse->srcpad),
1870 /* segment adjustment magic; only if we are running the whole show */
1871 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
1872 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
1873 parse->priv->upstream_seekable)) {
1874 /* segment times are typically estimates,
1875 * actual frame data might lead subclass to different timestamps,
1876 * so override segment start from what is supplied there */
1877 if (G_UNLIKELY (parse->priv->pending_segment && !parse->priv->exact_position
1878 && GST_CLOCK_TIME_IS_VALID (last_start))) {
1879 gst_event_unref (parse->priv->pending_segment);
1880 parse->segment.start =
1881 MIN ((guint64) last_start, (guint64) parse->segment.stop);
1883 GST_DEBUG_OBJECT (parse,
1884 "adjusting pending segment start to %" GST_TIME_FORMAT,
1885 GST_TIME_ARGS (parse->segment.start));
1887 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
1889 /* handle gaps, e.g. non-zero start-time, in as much not handled by above */
1890 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
1891 GST_CLOCK_TIME_IS_VALID (last_start)) {
1892 GstClockTimeDiff diff;
1894 /* only send newsegments with increasing start times,
1895 * otherwise if these go back and forth downstream (sinks) increase
1896 * accumulated time and running_time */
1897 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
1898 if (G_UNLIKELY (diff > 2 * GST_SECOND
1899 && last_start > parse->segment.start
1900 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
1901 || last_start < parse->segment.stop))) {
1903 GST_DEBUG_OBJECT (parse,
1904 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
1905 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
1906 "Sending updated NEWSEGMENT events", diff,
1907 GST_TIME_ARGS (parse->segment.position),
1908 GST_TIME_ARGS (last_start));
1910 if (G_UNLIKELY (parse->priv->pending_segment)) {
1911 gst_event_unref (parse->priv->pending_segment);
1912 parse->segment.start = last_start;
1913 parse->segment.time = last_start;
1914 parse->priv->pending_segment =
1915 gst_event_new_segment (&parse->segment);
1917 /* skip gap FIXME */
1918 gst_pad_push_event (parse->srcpad,
1919 gst_event_new_segment (&parse->segment));
1921 parse->segment.position = last_start;
1926 /* and should then also be linked downstream, so safe to send some events */
1927 if (G_UNLIKELY (parse->priv->close_segment)) {
1928 /* only set up by loop */
1929 GST_DEBUG_OBJECT (parse, "loop sending close segment");
1930 gst_pad_push_event (parse->srcpad, parse->priv->close_segment);
1931 parse->priv->close_segment = NULL;
1933 if (G_UNLIKELY (parse->priv->pending_segment)) {
1934 GstEvent *pending_segment;
1936 pending_segment = parse->priv->pending_segment;
1937 parse->priv->pending_segment = NULL;
1939 GST_DEBUG_OBJECT (parse, "%s push pending segment",
1940 parse->priv->pad_mode == GST_PAD_MODE_PULL ? "loop" : "chain");
1941 gst_pad_push_event (parse->srcpad, pending_segment);
1943 /* have caps; check identity */
1944 gst_base_parse_check_media (parse);
1947 /* update bitrates and optionally post corresponding tags
1948 * (following newsegment) */
1949 gst_base_parse_update_bitrates (parse, frame);
1951 if (G_UNLIKELY (parse->priv->pending_events)) {
1954 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
1955 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
1957 g_list_free (parse->priv->pending_events);
1958 parse->priv->pending_events = NULL;
1961 if (klass->pre_push_frame) {
1962 ret = klass->pre_push_frame (parse, frame);
1964 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
1967 /* take final ownership of frame buffer */
1968 buffer = frame->buffer;
1969 frame->buffer = NULL;
1971 /* subclass must play nice */
1972 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1974 parse->priv->seen_keyframe |= parse->priv->is_video &&
1975 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
1977 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
1978 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1979 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
1980 GST_BUFFER_TIMESTAMP (buffer) >
1981 parse->segment.stop + parse->priv->lead_out_ts) {
1982 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
1984 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1985 GST_BUFFER_DURATION_IS_VALID (buffer) &&
1986 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
1987 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
1988 parse->priv->lead_in_ts < parse->segment.start) {
1989 if (parse->priv->seen_keyframe) {
1990 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
1993 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
1994 ret = GST_BASE_PARSE_FLOW_DROPPED;
2001 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2002 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2003 gst_buffer_unref (buffer);
2005 } else if (ret == GST_FLOW_OK) {
2006 if (parse->segment.rate > 0.0) {
2007 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2009 ret = gst_pad_push (parse->srcpad, buffer);
2010 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2012 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2014 parse->priv->buffers_queued =
2015 g_slist_prepend (parse->priv->buffers_queued, buffer);
2019 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2020 size, gst_flow_get_name (ret));
2021 gst_buffer_unref (buffer);
2022 /* if we are not sufficiently in control, let upstream decide on EOS */
2023 if (ret == GST_FLOW_EOS &&
2024 (parse->priv->passthrough ||
2025 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2026 !parse->priv->upstream_seekable)))
2030 /* Update current running segment position */
2031 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
2032 parse->segment.position < last_stop)
2033 parse->segment.position = last_stop;
2035 gst_base_parse_frame_free (frame);
2041 /* gst_base_parse_drain:
2043 * Drains the adapter until it is empty. It decreases the min_frame_size to
2044 * match the current adapter size and calls chain method until the adapter
2045 * is emptied or chain returns with error.
2048 gst_base_parse_drain (GstBaseParse * parse)
2052 GST_DEBUG_OBJECT (parse, "draining");
2053 parse->priv->drain = TRUE;
2056 avail = gst_adapter_available (parse->priv->adapter);
2060 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2061 NULL) != GST_FLOW_OK) {
2065 /* nothing changed, maybe due to truncated frame; break infinite loop */
2066 if (avail == gst_adapter_available (parse->priv->adapter)) {
2067 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2068 gst_adapter_clear (parse->priv->adapter);
2072 parse->priv->drain = FALSE;
2075 /* gst_base_parse_send_buffers
2077 * Sends buffers collected in send_buffers downstream, and ensures that list
2078 * is empty at the end (errors or not).
2080 static GstFlowReturn
2081 gst_base_parse_send_buffers (GstBaseParse * parse)
2083 GSList *send = NULL;
2085 GstFlowReturn ret = GST_FLOW_OK;
2087 send = parse->priv->buffers_send;
2091 buf = GST_BUFFER_CAST (send->data);
2092 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
2093 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2094 ", offset %" G_GINT64_FORMAT, buf,
2095 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
2096 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2098 /* iterate output queue an push downstream */
2099 ret = gst_pad_push (parse->srcpad, buf);
2100 send = g_slist_delete_link (send, send);
2102 /* clear any leftover if error */
2103 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2105 buf = GST_BUFFER_CAST (send->data);
2106 gst_buffer_unref (buf);
2107 send = g_slist_delete_link (send, send);
2112 parse->priv->buffers_send = send;
2117 /* gst_base_parse_process_fragment:
2119 * Processes a reverse playback (forward) fragment:
2120 * - append head of last fragment that was skipped to current fragment data
2121 * - drain the resulting current fragment data (i.e. repeated chain)
2122 * - add time/duration (if needed) to frames queued by chain
2123 * - push queued data
2125 static GstFlowReturn
2126 gst_base_parse_process_fragment (GstBaseParse * parse, gboolean push_only)
2129 GstFlowReturn ret = GST_FLOW_OK;
2130 gboolean seen_key = FALSE, seen_delta = FALSE;
2136 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2137 while (parse->priv->buffers_pending) {
2138 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2139 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2140 gst_buffer_get_size (buf));
2141 gst_adapter_push (parse->priv->adapter, buf);
2142 parse->priv->buffers_pending =
2143 g_slist_delete_link (parse->priv->buffers_pending,
2144 parse->priv->buffers_pending);
2147 /* invalidate so no fall-back timestamping is performed;
2148 * ok if taken from subclass or upstream */
2149 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2150 /* prevent it hanging around stop all the time */
2151 parse->segment.position = GST_CLOCK_TIME_NONE;
2153 parse->priv->discont = TRUE;
2155 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2156 /* initial skipped data is added to buffers_pending */
2157 gst_base_parse_drain (parse);
2160 if (parse->priv->buffers_send) {
2161 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2162 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2165 /* add metadata (if needed to queued buffers */
2166 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2167 GST_TIME_ARGS (parse->priv->last_ts));
2168 while (parse->priv->buffers_queued) {
2169 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2171 /* no touching if upstream or parsing provided time */
2172 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2173 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2174 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2175 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2176 GST_BUFFER_DURATION_IS_VALID (buf)) {
2177 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2178 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2180 parse->priv->last_ts = 0;
2181 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2182 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2183 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2185 /* no idea, very bad */
2186 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2189 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2191 /* reverse order for ascending sending */
2192 /* send downstream at keyframe not preceded by a keyframe
2193 * (e.g. that should identify start of collection of IDR nals) */
2194 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2196 ret = gst_base_parse_send_buffers (parse);
2197 /* if a problem, throw all to sending */
2198 if (ret != GST_FLOW_OK) {
2199 parse->priv->buffers_send =
2200 g_slist_reverse (parse->priv->buffers_queued);
2201 parse->priv->buffers_queued = NULL;
2210 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2212 parse->priv->buffers_send =
2213 g_slist_prepend (parse->priv->buffers_send, buf);
2214 parse->priv->buffers_queued =
2215 g_slist_delete_link (parse->priv->buffers_queued,
2216 parse->priv->buffers_queued);
2219 /* audio may have all marked as keyframe, so arrange to send here */
2221 ret = gst_base_parse_send_buffers (parse);
2223 /* any trailing unused no longer usable (ideally none) */
2224 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2225 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2226 gst_adapter_available (parse->priv->adapter));
2227 gst_adapter_clear (parse->priv->adapter);
2233 /* small helper that checks whether we have been trying to resync too long */
2234 static inline GstFlowReturn
2235 gst_base_parse_check_sync (GstBaseParse * parse)
2237 if (G_UNLIKELY (parse->priv->discont &&
2238 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2239 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2240 ("Failed to parse stream"), (NULL));
2241 return GST_FLOW_ERROR;
2247 static GstFlowReturn
2248 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
2250 GstBaseParseClass *bclass;
2251 GstBaseParse *parse;
2252 GstFlowReturn ret = GST_FLOW_OK;
2253 GstBuffer *outbuf = NULL;
2254 GstBuffer *tmpbuf = NULL;
2258 guint old_min_size = 0, min_size, av;
2259 GstClockTime timestamp;
2260 GstBaseParseFrame *frame;
2262 parse = GST_BASE_PARSE (parent);
2263 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2265 if (parse->priv->detecting) {
2266 GstBuffer *detect_buf;
2268 if (parse->priv->detect_buffers_size == 0) {
2269 detect_buf = gst_buffer_ref (buffer);
2274 detect_buf = gst_buffer_new ();
2276 for (l = parse->priv->detect_buffers; l; l = l->next) {
2277 gsize tmpsize = gst_buffer_get_size (l->data);
2279 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
2280 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
2284 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
2285 offset, gst_buffer_get_size (buffer));
2288 ret = bclass->detect (parse, detect_buf);
2289 gst_buffer_unref (detect_buf);
2291 if (ret == GST_FLOW_OK) {
2294 /* Detected something */
2295 parse->priv->detecting = FALSE;
2297 for (l = parse->priv->detect_buffers; l; l = l->next) {
2298 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2300 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2301 parent, GST_BUFFER_CAST (l->data));
2303 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2305 g_list_free (parse->priv->detect_buffers);
2306 parse->priv->detect_buffers = NULL;
2307 parse->priv->detect_buffers_size = 0;
2309 if (ret != GST_FLOW_OK) {
2313 /* Handle the current buffer */
2314 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2315 /* Still detecting, append buffer or error out if draining */
2317 if (parse->priv->drain) {
2318 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2319 return GST_FLOW_ERROR;
2320 } else if (parse->priv->flushing) {
2321 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2323 g_list_free (parse->priv->detect_buffers);
2324 parse->priv->detect_buffers = NULL;
2325 parse->priv->detect_buffers_size = 0;
2327 parse->priv->detect_buffers =
2328 g_list_append (parse->priv->detect_buffers, buffer);
2329 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
2333 /* Something went wrong, subclass responsible for error reporting */
2337 /* And now handle the current buffer if detection worked */
2340 frame = &parse->priv->frame;
2342 if (G_LIKELY (buffer)) {
2343 GST_LOG_OBJECT (parse,
2344 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT,
2345 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer));
2346 if (G_UNLIKELY (parse->priv->passthrough)) {
2347 gst_base_parse_frame_init (frame);
2348 frame->buffer = gst_buffer_make_writable (buffer);
2349 return gst_base_parse_push_frame (parse, frame);
2351 /* upstream feeding us in reverse playback;
2352 * gather each fragment, then process it in single run */
2353 if (parse->segment.rate < 0.0) {
2354 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2355 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2356 ret = gst_base_parse_process_fragment (parse, FALSE);
2358 gst_adapter_push (parse->priv->adapter, buffer);
2361 gst_adapter_push (parse->priv->adapter, buffer);
2364 if (G_UNLIKELY (buffer &&
2365 GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2366 frame->_private_flags |= GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
2367 gst_base_parse_frame_free (frame);
2370 /* Parse and push as many frames as possible */
2371 /* Stop either when adapter is empty or we are flushing */
2372 while (!parse->priv->flushing) {
2375 /* maintain frame state for a single frame parsing round across _chain calls,
2376 * so only init when needed */
2377 if (!frame->_private_flags)
2378 gst_base_parse_frame_init (frame);
2380 tmpbuf = gst_buffer_new ();
2383 /* Synchronization loop */
2385 /* note: if subclass indicates MAX fsize,
2386 * this will not likely be available anyway ... */
2387 min_size = MAX (parse->priv->min_frame_size, fsize);
2388 av = gst_adapter_available (parse->priv->adapter);
2390 /* loop safety check */
2391 if (G_UNLIKELY (old_min_size >= min_size))
2393 old_min_size = min_size;
2395 if (G_UNLIKELY (parse->priv->drain)) {
2397 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2398 if (G_UNLIKELY (!min_size)) {
2399 gst_buffer_unref (tmpbuf);
2404 /* Collect at least min_frame_size bytes */
2405 if (av < min_size) {
2406 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)",
2408 gst_buffer_unref (tmpbuf);
2412 /* always pass all available data */
2413 data = gst_adapter_map (parse->priv->adapter, av);
2414 gst_buffer_take_memory (tmpbuf, -1,
2415 gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY,
2416 (gpointer) data, NULL, av, 0, av));
2417 GST_BUFFER_OFFSET (tmpbuf) = parse->priv->offset;
2419 if (parse->priv->discont) {
2420 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2421 GST_BUFFER_FLAG_SET (tmpbuf, GST_BUFFER_FLAG_DISCONT);
2425 gst_base_parse_frame_update (parse, frame, tmpbuf);
2426 res = bclass->check_valid_frame (parse, frame, &fsize, &skip);
2427 gst_adapter_unmap (parse->priv->adapter);
2428 gst_buffer_replace (&frame->buffer, NULL);
2429 gst_buffer_remove_memory_range (tmpbuf, 0, -1);
2431 if (gst_adapter_available (parse->priv->adapter) < fsize) {
2432 GST_DEBUG_OBJECT (parse, "found valid frame but not enough data"
2433 " available (only %" G_GSIZE_FORMAT " bytes)",
2434 gst_adapter_available (parse->priv->adapter));
2435 gst_buffer_unref (tmpbuf);
2438 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2442 /* subclass didn't touch this value. By default we skip 1 byte */
2446 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2447 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2448 /* reverse playback, and no frames found yet, so we are skipping
2449 * the leading part of a fragment, which may form the tail of
2450 * fragment coming later, hopefully subclass skips efficiently ... */
2451 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2452 outbuf = gst_adapter_take_buffer (parse->priv->adapter, skip);
2453 outbuf = gst_buffer_make_writable (outbuf);
2454 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
2455 parse->priv->buffers_pending =
2456 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2459 gst_adapter_flush (parse->priv->adapter, skip);
2461 parse->priv->offset += skip;
2462 if (!parse->priv->discont)
2463 parse->priv->sync_offset = parse->priv->offset;
2464 parse->priv->discont = TRUE;
2465 /* something changed least; nullify loop check */
2468 /* skip == 0 should imply subclass set min_size to need more data;
2469 * we check this shortly */
2470 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2471 gst_buffer_unref (tmpbuf);
2475 gst_buffer_unref (tmpbuf);
2479 /* Subclass found the sync, but still wants to skip some data */
2480 GST_LOG_OBJECT (parse, "skipping %d bytes", skip);
2481 gst_adapter_flush (parse->priv->adapter, skip);
2482 parse->priv->offset += skip;
2485 /* Grab lock to prevent a race with FLUSH_START handler */
2486 GST_PAD_STREAM_LOCK (parse->srcpad);
2488 /* FLUSH_START event causes the "flushing" flag to be set. In this
2489 * case we can leave the frame pushing loop */
2490 if (parse->priv->flushing) {
2491 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2495 /* move along with upstream timestamp (if any),
2496 * but interpolate in between */
2497 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2498 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2499 (parse->priv->prev_ts != timestamp)) {
2500 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2503 /* FIXME: Would it be more efficient to make a subbuffer instead? */
2504 outbuf = gst_adapter_take_buffer (parse->priv->adapter, fsize);
2505 outbuf = gst_buffer_make_writable (outbuf);
2507 /* Subclass may want to know the data offset */
2508 GST_BUFFER_OFFSET (outbuf) = parse->priv->offset;
2509 parse->priv->offset += fsize;
2510 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2511 GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
2513 frame->buffer = outbuf;
2514 ret = gst_base_parse_handle_and_push_frame (parse, bclass, frame);
2515 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2517 if (ret != GST_FLOW_OK) {
2518 GST_LOG_OBJECT (parse, "push returned %d", ret);
2524 GST_LOG_OBJECT (parse, "chain leaving");
2530 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2531 ("min_size evolution %d -> %d; breaking to avoid looping",
2532 old_min_size, min_size));
2533 return GST_FLOW_ERROR;
2537 /* pull @size bytes at current offset,
2538 * i.e. at least try to and possibly return a shorter buffer if near the end */
2539 static GstFlowReturn
2540 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2541 GstBuffer ** buffer)
2543 GstFlowReturn ret = GST_FLOW_OK;
2545 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2547 /* Caching here actually makes much less difference than one would expect.
2548 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2549 if (parse->priv->cache) {
2550 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2551 gint cache_size = gst_buffer_get_size (parse->priv->cache);
2553 if (cache_offset <= parse->priv->offset &&
2554 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2555 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
2556 parse->priv->offset - cache_offset, size);
2557 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2560 /* not enough data in the cache, free cache and get a new one */
2561 gst_buffer_unref (parse->priv->cache);
2562 parse->priv->cache = NULL;
2565 /* refill the cache */
2567 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2568 64 * 1024), &parse->priv->cache);
2569 if (ret != GST_FLOW_OK) {
2570 parse->priv->cache = NULL;
2574 if (gst_buffer_get_size (parse->priv->cache) >= size) {
2576 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
2578 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2582 /* Not possible to get enough data, try a last time with
2583 * requesting exactly the size we need */
2584 gst_buffer_unref (parse->priv->cache);
2585 parse->priv->cache = NULL;
2587 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2588 &parse->priv->cache);
2590 if (ret != GST_FLOW_OK) {
2591 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2596 if (gst_buffer_get_size (parse->priv->cache) < size) {
2597 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2598 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
2599 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
2601 *buffer = parse->priv->cache;
2602 parse->priv->cache = NULL;
2608 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
2609 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2614 static GstFlowReturn
2615 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2618 GstClockTime ts = 0;
2622 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2623 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2624 parse->priv->last_offset);
2626 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2627 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2628 GST_TIME_ARGS (parse->segment.start));
2633 /* last fragment started at last_offset / last_ts;
2634 * seek back 10s capped at 1MB */
2635 if (parse->priv->last_ts >= 10 * GST_SECOND)
2636 ts = parse->priv->last_ts - 10 * GST_SECOND;
2637 /* if we are exact now, we will be more so going backwards */
2638 if (parse->priv->exact_position) {
2639 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2641 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2642 GST_FORMAT_BYTES, &offset)) {
2643 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2646 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2647 parse->priv->last_offset - 1024);
2648 offset = MAX (0, offset);
2650 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2652 parse->priv->offset = offset;
2654 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2656 if (ret != GST_FLOW_OK)
2659 /* offset will increase again as fragment is processed/parsed */
2660 parse->priv->last_offset = offset;
2662 gst_adapter_push (parse->priv->adapter, buffer);
2663 ret = gst_base_parse_process_fragment (parse, FALSE);
2664 if (ret != GST_FLOW_OK)
2667 /* force previous fragment */
2668 parse->priv->offset = -1;
2675 * pull and scan for next frame starting from current offset
2676 * ajusts sync, drain and offset going along */
2677 static GstFlowReturn
2678 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2679 GstBaseParseFrame * frame, gboolean full)
2681 GstBuffer *buffer, *outbuf;
2682 GstFlowReturn ret = GST_FLOW_OK;
2683 guint fsize = 1, min_size, old_min_size = 0;
2686 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2688 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2689 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2691 /* let's make this efficient for all subclass once and for all;
2692 * maybe it does not need this much, but in the latter case, we know we are
2693 * in pull mode here and might as well try to read and supply more anyway
2694 * (so does the buffer caching mechanism) */
2700 min_size = MAX (parse->priv->min_frame_size, fsize);
2701 /* loop safety check */
2702 if (G_UNLIKELY (old_min_size >= min_size))
2704 old_min_size = min_size;
2706 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2707 if (ret != GST_FLOW_OK)
2710 if (parse->priv->discont) {
2711 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2712 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
2715 /* if we got a short read, inform subclass we are draining leftover
2716 * and no more is to be expected */
2717 if (gst_buffer_get_size (buffer) < min_size)
2718 parse->priv->drain = TRUE;
2720 if (parse->priv->detecting) {
2721 ret = klass->detect (parse, buffer);
2722 if (ret == GST_FLOW_NOT_NEGOTIATED) {
2723 /* If draining we error out, otherwise request a buffer
2725 if (parse->priv->drain) {
2726 gst_buffer_unref (buffer);
2727 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
2728 return GST_FLOW_ERROR;
2731 gst_buffer_unref (buffer);
2734 } else if (ret != GST_FLOW_OK) {
2735 gst_buffer_unref (buffer);
2736 GST_ERROR_OBJECT (parse, "detect() returned %s",
2737 gst_flow_get_name (ret));
2741 /* Else handle this buffer normally */
2745 gst_base_parse_frame_update (parse, frame, buffer);
2746 res = klass->check_valid_frame (parse, frame, &fsize, &skip);
2747 gst_buffer_replace (&frame->buffer, NULL);
2749 parse->priv->drain = FALSE;
2750 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2753 parse->priv->drain = FALSE;
2757 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2758 if (full && parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2759 /* reverse playback, and no frames found yet, so we are skipping
2760 * the leading part of a fragment, which may form the tail of
2761 * fragment coming later, hopefully subclass skips efficiently ... */
2762 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, 0, skip);
2763 parse->priv->buffers_pending =
2764 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2767 parse->priv->offset += skip;
2768 if (!parse->priv->discont)
2769 parse->priv->sync_offset = parse->priv->offset;
2770 parse->priv->discont = TRUE;
2771 /* something changed at least; nullify loop check */
2772 if (fsize == G_MAXUINT)
2773 fsize = old_min_size + 64 * 1024;
2776 /* skip == 0 should imply subclass set min_size to need more data;
2777 * we check this shortly */
2778 GST_DEBUG_OBJECT (parse, "finding sync...");
2779 gst_buffer_unref (buffer);
2780 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2785 /* Does the subclass want to skip too? */
2787 parse->priv->offset += skip;
2791 if (fsize + skip <= gst_buffer_get_size (buffer)) {
2792 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, skip, fsize);
2793 GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer) + skip;
2794 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2795 gst_buffer_unref (buffer);
2797 gst_buffer_unref (buffer);
2798 ret = gst_base_parse_pull_range (parse, fsize, &outbuf);
2799 if (ret != GST_FLOW_OK)
2801 if (gst_buffer_get_size (outbuf) < fsize) {
2802 gst_buffer_unref (outbuf);
2807 parse->priv->offset += fsize;
2809 frame->buffer = outbuf;
2817 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2818 ("min_size evolution %d -> %d; breaking to avoid looping",
2819 old_min_size, min_size));
2820 return GST_FLOW_ERROR;
2824 /* Loop that is used in pull mode to retrieve data from upstream */
2826 gst_base_parse_loop (GstPad * pad)
2828 GstBaseParse *parse;
2829 GstBaseParseClass *klass;
2830 GstFlowReturn ret = GST_FLOW_OK;
2831 GstBaseParseFrame frame;
2833 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2834 klass = GST_BASE_PARSE_GET_CLASS (parse);
2836 /* reverse playback:
2837 * first fragment (closest to stop time) is handled normally below,
2838 * then we pull in fragments going backwards */
2839 if (parse->segment.rate < 0.0) {
2840 /* check if we jumped back to a previous fragment,
2841 * which is a post-first fragment */
2842 if (parse->priv->offset < 0) {
2843 ret = gst_base_parse_handle_previous_fragment (parse);
2848 gst_base_parse_frame_init (&frame);
2849 ret = gst_base_parse_scan_frame (parse, klass, &frame, TRUE);
2850 if (ret != GST_FLOW_OK)
2853 /* This always cleans up frame, even if error occurs */
2854 ret = gst_base_parse_handle_and_push_frame (parse, klass, &frame);
2856 /* eat expected eos signalling past segment in reverse playback */
2857 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
2858 parse->segment.position >= parse->segment.stop) {
2859 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2860 /* push what was accumulated during loop run */
2861 gst_base_parse_process_fragment (parse, TRUE);
2862 /* force previous fragment */
2863 parse->priv->offset = -1;
2868 if (ret == GST_FLOW_EOS)
2870 else if (ret != GST_FLOW_OK)
2873 gst_object_unref (parse);
2880 GST_DEBUG_OBJECT (parse, "eos");
2885 gboolean push_eos = FALSE;
2887 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2888 gst_flow_get_name (ret));
2889 gst_pad_pause_task (parse->sinkpad);
2891 if (ret == GST_FLOW_EOS) {
2892 /* handle end-of-stream/segment */
2893 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2896 if ((stop = parse->segment.stop) == -1)
2897 stop = parse->segment.duration;
2899 GST_DEBUG_OBJECT (parse, "sending segment_done");
2901 gst_element_post_message
2902 (GST_ELEMENT_CAST (parse),
2903 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2904 GST_FORMAT_TIME, stop));
2906 /* If we STILL have zero frames processed, fire an error */
2907 if (parse->priv->framecount == 0) {
2908 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2909 ("No valid frames found before end of stream"), (NULL));
2913 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
2914 /* for fatal errors we post an error message, wrong-state is
2915 * not fatal because it happens due to flushes and only means
2916 * that we should stop now. */
2917 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2918 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
2922 /* newsegment before eos */
2923 if (parse->priv->pending_segment) {
2924 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
2925 parse->priv->pending_segment = NULL;
2927 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
2929 gst_object_unref (parse);
2934 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
2936 GstBaseParse *parse;
2937 gboolean result = TRUE;
2941 parse = GST_BASE_PARSE (parent);
2943 GST_DEBUG_OBJECT (parse, "sink activate");
2945 query = gst_query_new_scheduling ();
2946 result = gst_pad_peer_query (sinkpad, query);
2948 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL);
2952 gst_query_unref (query);
2955 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
2956 result = gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE);
2958 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
2959 result = gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
2962 GST_DEBUG_OBJECT (parse, "sink activate return %d", result);
2967 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
2969 GstBaseParseClass *klass;
2970 gboolean result = TRUE;
2972 GST_DEBUG_OBJECT (parse, "activate %d", active);
2974 klass = GST_BASE_PARSE_GET_CLASS (parse);
2977 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
2978 result = klass->start (parse);
2980 /* If the subclass implements ::detect we want to
2981 * call it for the first buffers now */
2982 parse->priv->detecting = (klass->detect != NULL);
2984 /* We must make sure streaming has finished before resetting things
2985 * and calling the ::stop vfunc */
2986 GST_PAD_STREAM_LOCK (parse->sinkpad);
2987 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
2989 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
2990 result = klass->stop (parse);
2992 parse->priv->pad_mode = GST_PAD_MODE_NONE;
2994 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
2999 gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
3000 GstPadMode mode, gboolean active)
3002 gboolean result = TRUE;
3003 GstBaseParse *parse;
3005 parse = GST_BASE_PARSE (parent);
3007 GST_DEBUG_OBJECT (parse, "sink activate mode %d, %d", mode, active);
3009 result = gst_base_parse_activate (parse, active);
3013 case GST_PAD_MODE_PULL:
3015 parse->priv->pending_segment =
3016 gst_event_new_segment (&parse->segment);
3018 gst_pad_start_task (pad, (GstTaskFunction) gst_base_parse_loop,
3021 result &= gst_pad_stop_task (pad);
3029 parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
3031 GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
3037 * gst_base_parse_set_duration:
3038 * @parse: #GstBaseParse.
3040 * @duration: duration value.
3041 * @interval: how often to update the duration estimate based on bitrate, or 0.
3043 * Sets the duration of the currently playing media. Subclass can use this
3044 * when it is able to determine duration and/or notices a change in the media
3045 * duration. Alternatively, if @interval is non-zero (default), then stream
3046 * duration is determined based on estimated bitrate, and updated every @interval
3052 gst_base_parse_set_duration (GstBaseParse * parse,
3053 GstFormat fmt, gint64 duration, gint interval)
3055 g_return_if_fail (parse != NULL);
3057 if (parse->priv->upstream_has_duration) {
3058 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3062 if (duration != parse->priv->duration) {
3065 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
3066 gst_element_post_message (GST_ELEMENT (parse), m);
3068 /* TODO: what about duration tag? */
3070 parse->priv->duration = duration;
3071 parse->priv->duration_fmt = fmt;
3072 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3073 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3074 if (interval != 0) {
3075 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3079 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3080 parse->priv->update_interval = interval;
3086 * gst_base_parse_set_average_bitrate:
3087 * @parse: #GstBaseParse.
3088 * @bitrate: average bitrate in bits/second
3090 * Optionally sets the average bitrate detected in media (if non-zero),
3091 * e.g. based on metadata, as it will be posted to the application.
3093 * By default, announced average bitrate is estimated. The average bitrate
3094 * is used to estimate the total duration of the stream and to estimate
3095 * a seek position, if there's no index and the format is syncable
3096 * (see gst_base_parse_set_syncable()).
3101 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3103 parse->priv->bitrate = bitrate;
3104 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3108 * gst_base_parse_set_min_frame_size:
3109 * @parse: #GstBaseParse.
3110 * @min_size: Minimum size of the data that this base class should give to
3113 * Subclass can use this function to tell the base class that it needs to
3114 * give at least #min_size buffers.
3119 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3121 g_return_if_fail (parse != NULL);
3123 parse->priv->min_frame_size = min_size;
3124 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3128 * gst_base_parse_set_frame_rate:
3129 * @parse: the #GstBaseParse to set
3130 * @fps_num: frames per second (numerator).
3131 * @fps_den: frames per second (denominator).
3132 * @lead_in: frames needed before a segment for subsequent decode
3133 * @lead_out: frames needed after a segment
3135 * If frames per second is configured, parser can take care of buffer duration
3136 * and timestamping. When performing segment clipping, or seeking to a specific
3137 * location, a corresponding decoder might need an initial @lead_in and a
3138 * following @lead_out number of frames to ensure the desired segment is
3139 * entirely filled upon decoding.
3144 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3145 guint fps_den, guint lead_in, guint lead_out)
3147 g_return_if_fail (parse != NULL);
3149 parse->priv->fps_num = fps_num;
3150 parse->priv->fps_den = fps_den;
3151 if (!fps_num || !fps_den) {
3152 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3154 fps_num = fps_den = 0;
3155 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3156 parse->priv->lead_in = parse->priv->lead_out = 0;
3157 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3159 parse->priv->frame_duration =
3160 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3161 parse->priv->lead_in = lead_in;
3162 parse->priv->lead_out = lead_out;
3163 parse->priv->lead_in_ts =
3164 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3165 parse->priv->lead_out_ts =
3166 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3167 /* aim for about 1.5s to estimate duration */
3168 if (parse->priv->update_interval < 0) {
3169 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3170 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3171 parse->priv->update_interval);
3174 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3175 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3176 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3177 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3178 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3179 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3183 * gst_base_parse_set_has_timing_info:
3184 * @parse: a #GstBaseParse
3185 * @has_timing: whether frames carry timing information
3187 * Set if frames carry timing information which the subclass can (generally)
3188 * parse and provide. In particular, intrinsic (rather than estimated) time
3189 * can be obtained following a seek.
3194 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3196 parse->priv->has_timing_info = has_timing;
3197 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3201 * gst_base_parse_set_syncable:
3202 * @parse: a #GstBaseParse
3203 * @syncable: set if frame starts can be identified
3205 * Set if frame starts can be identified. This is set by default and
3206 * determines whether seeking based on bitrate averages
3207 * is possible for a format/stream.
3212 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3214 parse->priv->syncable = syncable;
3215 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3219 * gst_base_parse_set_passthrough:
3220 * @parse: a #GstBaseParse
3221 * @passthrough: %TRUE if parser should run in passthrough mode
3223 * Set if the nature of the format or configuration does not allow (much)
3224 * parsing, and the parser should operate in passthrough mode (which only
3225 * applies when operating in push mode). That is, incoming buffers are
3226 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3227 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3228 * so subclass can perform as much or as little is appropriate for
3229 * passthrough semantics in @pre_push_frame.
3234 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3236 parse->priv->passthrough = passthrough;
3237 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3241 * gst_base_parse_set_latency:
3242 * @parse: a #GstBaseParse
3243 * @min_latency: minimum parse latency
3244 * @max_latency: maximum parse latency
3246 * Sets the minimum and maximum (which may likely be equal) latency introduced
3247 * by the parsing process. If there is such a latency, which depends on the
3248 * particular parsing of the format, it typically corresponds to 1 frame duration.
3253 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3254 GstClockTime max_latency)
3256 GST_OBJECT_LOCK (parse);
3257 parse->priv->min_latency = min_latency;
3258 parse->priv->max_latency = max_latency;
3259 GST_OBJECT_UNLOCK (parse);
3260 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3261 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3262 GST_TIME_ARGS (max_latency));
3266 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3267 GstClockTime * duration)
3269 gboolean res = FALSE;
3271 g_return_val_if_fail (duration != NULL, FALSE);
3273 *duration = GST_CLOCK_TIME_NONE;
3274 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3275 GST_LOG_OBJECT (parse, "using provided duration");
3276 *duration = parse->priv->duration;
3278 } else if (parse->priv->duration != -1) {
3279 GST_LOG_OBJECT (parse, "converting provided duration");
3280 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3281 parse->priv->duration, format, (gint64 *) duration);
3282 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3283 GST_LOG_OBJECT (parse, "using estimated duration");
3284 *duration = parse->priv->estimated_duration;
3288 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3289 GST_TIME_ARGS (*duration));
3294 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
3296 GstBaseParse *parse;
3297 gboolean res = FALSE;
3299 parse = GST_BASE_PARSE (parent);
3301 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3303 switch (GST_QUERY_TYPE (query)) {
3304 case GST_QUERY_POSITION:
3309 GST_DEBUG_OBJECT (parse, "position query");
3310 gst_query_parse_position (query, &format, NULL);
3312 /* try upstream first */
3313 res = gst_pad_query_default (pad, parent, query);
3315 /* Fall back on interpreting segment */
3316 GST_OBJECT_LOCK (parse);
3317 if (format == GST_FORMAT_BYTES) {
3318 dest_value = parse->priv->offset;
3320 } else if (format == parse->segment.format &&
3321 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
3322 dest_value = gst_segment_to_stream_time (&parse->segment,
3323 parse->segment.format, parse->segment.position);
3326 GST_OBJECT_UNLOCK (parse);
3328 /* no precise result, upstream no idea either, then best estimate */
3329 /* priv->offset is updated in both PUSH/PULL modes */
3330 res = gst_base_parse_convert (parse,
3331 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3334 gst_query_set_position (query, format, dest_value);
3338 case GST_QUERY_DURATION:
3341 GstClockTime duration;
3343 GST_DEBUG_OBJECT (parse, "duration query");
3344 gst_query_parse_duration (query, &format, NULL);
3346 /* consult upstream */
3347 res = gst_pad_query_default (pad, parent, query);
3349 /* otherwise best estimate from us */
3351 res = gst_base_parse_get_duration (parse, format, &duration);
3353 gst_query_set_duration (query, format, duration);
3357 case GST_QUERY_SEEKING:
3360 GstClockTime duration = GST_CLOCK_TIME_NONE;
3361 gboolean seekable = FALSE;
3363 GST_DEBUG_OBJECT (parse, "seeking query");
3364 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3366 /* consult upstream */
3367 res = gst_pad_query_default (pad, parent, query);
3369 /* we may be able to help if in TIME */
3370 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3371 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3372 /* already OK if upstream takes care */
3373 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3375 if (!(res && seekable)) {
3376 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3377 || duration == -1) {
3378 /* seekable if we still have a chance to get duration later on */
3380 parse->priv->upstream_seekable && parse->priv->update_interval;
3382 seekable = parse->priv->upstream_seekable;
3383 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3386 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3392 case GST_QUERY_FORMATS:
3393 gst_query_set_formatsv (query, 3, fmtlist);
3396 case GST_QUERY_CONVERT:
3398 GstFormat src_format, dest_format;
3399 gint64 src_value, dest_value;
3401 gst_query_parse_convert (query, &src_format, &src_value,
3402 &dest_format, &dest_value);
3404 res = gst_base_parse_convert (parse, src_format, src_value,
3405 dest_format, &dest_value);
3407 gst_query_set_convert (query, src_format, src_value,
3408 dest_format, dest_value);
3412 case GST_QUERY_LATENCY:
3414 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3416 GstClockTime min_latency, max_latency;
3418 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3419 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3420 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3421 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3423 GST_OBJECT_LOCK (parse);
3424 /* add our latency */
3425 if (min_latency != -1)
3426 min_latency += parse->priv->min_latency;
3427 if (max_latency != -1)
3428 max_latency += parse->priv->max_latency;
3429 GST_OBJECT_UNLOCK (parse);
3431 gst_query_set_latency (query, live, min_latency, max_latency);
3436 res = gst_pad_query_default (pad, parent, query);
3442 /* scans for a cluster start from @pos,
3443 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3444 static GstFlowReturn
3445 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3446 GstClockTime * time, GstClockTime * duration)
3448 GstBaseParseClass *klass;
3450 gboolean orig_drain, orig_discont;
3451 GstFlowReturn ret = GST_FLOW_OK;
3452 GstBuffer *buf = NULL;
3453 GstBaseParseFrame frame;
3455 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3456 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3457 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3459 klass = GST_BASE_PARSE_GET_CLASS (parse);
3461 *time = GST_CLOCK_TIME_NONE;
3462 *duration = GST_CLOCK_TIME_NONE;
3465 orig_offset = parse->priv->offset;
3466 orig_discont = parse->priv->discont;
3467 orig_drain = parse->priv->drain;
3469 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3470 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3472 gst_base_parse_frame_init (&frame);
3474 /* jump elsewhere and locate next frame */
3475 parse->priv->offset = *pos;
3476 ret = gst_base_parse_scan_frame (parse, klass, &frame, FALSE);
3477 if (ret != GST_FLOW_OK)
3481 GST_LOG_OBJECT (parse,
3482 "peek parsing frame at offset %" G_GUINT64_FORMAT
3483 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
3484 GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET (buf),
3485 gst_buffer_get_size (buf));
3487 /* get offset first, subclass parsing might dump other stuff in there */
3488 *pos = GST_BUFFER_OFFSET (buf);
3489 ret = klass->parse_frame (parse, &frame);
3492 /* but it should provide proper time */
3493 *time = GST_BUFFER_TIMESTAMP (buf);
3494 *duration = GST_BUFFER_DURATION (buf);
3496 gst_base_parse_frame_free (&frame);
3498 GST_LOG_OBJECT (parse,
3499 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3500 GST_TIME_ARGS (*time), *pos);
3504 parse->priv->offset = orig_offset;
3505 parse->priv->discont = orig_discont;
3506 parse->priv->drain = orig_drain;
3511 /* bisect and scan through file for frame starting before @time,
3512 * returns OK and @time/@offset if found, NONE and/or error otherwise
3513 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3514 static GstFlowReturn
3515 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3518 GstFlowReturn ret = GST_FLOW_OK;
3519 gint64 lpos, hpos, newpos;
3520 GstClockTime time, ltime, htime, newtime, dur;
3521 gboolean cont = TRUE;
3522 const GstClockTime tolerance = TARGET_DIFFERENCE;
3523 const guint chunk = 4 * 1024;
3525 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3526 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3528 /* TODO also make keyframe aware if useful some day */
3543 /* do not know at first */
3545 *_time = GST_CLOCK_TIME_NONE;
3547 /* need initial positions; start and end */
3548 lpos = parse->priv->first_frame_offset;
3549 ltime = parse->priv->first_frame_ts;
3550 htime = parse->priv->duration;
3551 hpos = parse->priv->upstream_size;
3553 /* check preconditions are satisfied;
3554 * start and end are needed, except for special case where we scan for
3555 * last frame to determine duration */
3556 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
3557 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3558 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3562 /* shortcut cases */
3565 } else if (time < ltime + tolerance) {
3569 } else if (time >= htime) {
3575 while (htime > ltime && cont) {
3576 GST_LOG_OBJECT (parse,
3577 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3578 GST_TIME_ARGS (ltime));
3579 GST_LOG_OBJECT (parse,
3580 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3581 GST_TIME_ARGS (htime));
3582 if (G_UNLIKELY (time == G_MAXINT64)) {
3584 } else if (G_LIKELY (hpos > lpos)) {
3586 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3589 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3591 /* we check this case once, but not forever, so break loop */
3596 newpos = CLAMP (newpos, lpos, hpos);
3597 GST_LOG_OBJECT (parse,
3598 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3599 GST_TIME_ARGS (time), newpos);
3601 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3602 if (ret == GST_FLOW_EOS) {
3603 /* heuristic HACK */
3604 hpos = MAX (lpos, hpos - chunk);
3606 } else if (ret != GST_FLOW_OK) {
3610 if (newtime == -1 || newpos == -1) {
3611 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3615 if (G_UNLIKELY (time == G_MAXINT64)) {
3618 if (GST_CLOCK_TIME_IS_VALID (dur))
3621 } else if (newtime > time) {
3623 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3625 } else if (newtime + tolerance > time) {
3626 /* close enough undershoot */
3630 } else if (newtime < ltime) {
3631 /* so a position beyond lpos resulted in earlier time than ltime ... */
3632 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3635 /* undershoot too far */
3636 newpos += newpos == lpos ? chunk : 0;
3637 lpos = CLAMP (newpos, lpos, hpos);
3643 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3644 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3649 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3650 gboolean before, GstClockTime * _ts)
3652 gint64 bytes = 0, ts = 0;
3653 GstIndexEntry *entry = NULL;
3655 if (time == GST_CLOCK_TIME_NONE) {
3661 g_static_mutex_lock (&parse->priv->index_lock);
3662 if (parse->priv->index) {
3663 /* Let's check if we have an index entry for that time */
3664 entry = gst_index_get_assoc_entry (parse->priv->index,
3665 parse->priv->index_id,
3666 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3667 GST_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3671 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3672 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3674 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3675 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3676 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3678 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3679 GST_TIME_ARGS (time));
3682 ts = GST_CLOCK_TIME_NONE;
3685 g_static_mutex_unlock (&parse->priv->index_lock);
3694 /* returns TRUE if seek succeeded */
3696 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3701 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3702 gboolean flush, update, res = TRUE, accurate;
3703 gint64 cur, stop, seekpos, seekstop;
3704 GstSegment seeksegment = { 0, };
3705 GstClockTime start_ts;
3707 gst_event_parse_seek (event, &rate, &format, &flags,
3708 &cur_type, &cur, &stop_type, &stop);
3710 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3711 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3712 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3713 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3715 /* no negative rates in push mode */
3716 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
3719 if (cur_type != GST_SEEK_TYPE_SET ||
3720 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3723 /* For any format other than TIME, see if upstream handles
3724 * it directly or fail. For TIME, try upstream, but do it ourselves if
3725 * it fails upstream */
3726 if (format != GST_FORMAT_TIME) {
3727 /* default action delegates to upstream */
3731 gst_event_ref (event);
3732 if ((res = gst_pad_push_event (parse->sinkpad, event))) {
3737 /* get flush flag */
3738 flush = flags & GST_SEEK_FLAG_FLUSH;
3740 /* copy segment, we need this because we still need the old
3741 * segment when we close the current segment. */
3742 gst_segment_copy_into (&parse->segment, &seeksegment);
3744 GST_DEBUG_OBJECT (parse, "configuring seek");
3745 gst_segment_do_seek (&seeksegment, rate, format, flags,
3746 cur_type, cur, stop_type, stop, &update);
3748 /* accurate seeking implies seek tables are used to obtain position,
3749 * and the requested segment is maintained exactly, not adjusted any way */
3750 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3752 /* maybe we can be accurate for (almost) free */
3753 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
3754 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
3755 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3759 GstClockTime startpos = seeksegment.position;
3761 /* accurate requested, so ... seek a bit before target */
3762 if (startpos < parse->priv->lead_in_ts)
3765 startpos -= parse->priv->lead_in_ts;
3766 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3767 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3770 start_ts = seeksegment.position;
3771 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.position,
3772 GST_FORMAT_BYTES, &seekpos))
3773 goto convert_failed;
3774 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3775 GST_FORMAT_BYTES, &seekstop))
3776 goto convert_failed;
3779 GST_DEBUG_OBJECT (parse,
3780 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3782 GST_DEBUG_OBJECT (parse,
3783 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3784 seeksegment.stop, seekstop);
3786 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
3789 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3792 if (parse->srcpad) {
3793 GST_DEBUG_OBJECT (parse, "sending flush start");
3794 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3795 /* unlock upstream pull_range */
3796 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3799 gst_pad_pause_task (parse->sinkpad);
3802 /* we should now be able to grab the streaming thread because we stopped it
3803 * with the above flush/pause code */
3804 GST_PAD_STREAM_LOCK (parse->sinkpad);
3806 /* save current position */
3807 last_stop = parse->segment.position;
3808 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3811 /* now commit to new position */
3813 /* prepare for streaming again */
3815 GST_DEBUG_OBJECT (parse, "sending flush stop");
3816 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop (TRUE));
3817 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop (TRUE));
3818 gst_base_parse_clear_queues (parse);
3820 /* keep track of our position */
3821 seeksegment.base = gst_segment_to_running_time (&seeksegment,
3822 seeksegment.format, parse->segment.position);
3825 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3827 /* store the newsegment event so it can be sent from the streaming thread. */
3828 if (parse->priv->pending_segment)
3829 gst_event_unref (parse->priv->pending_segment);
3831 /* This will be sent later in _loop() */
3832 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
3834 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3835 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3836 ", pos = %" GST_TIME_FORMAT, format,
3837 GST_TIME_ARGS (parse->segment.start),
3838 GST_TIME_ARGS (parse->segment.stop),
3839 GST_TIME_ARGS (parse->segment.start));
3841 /* one last chance in pull mode to stay accurate;
3842 * maybe scan and subclass can find where to go */
3845 GstClockTime ts = seeksegment.position;
3847 gst_base_parse_locate_time (parse, &ts, &scanpos);
3851 /* running collected index now consists of several intervals,
3852 * so optimized check no longer possible */
3853 parse->priv->index_last_valid = FALSE;
3854 parse->priv->index_last_offset = 0;
3855 parse->priv->index_last_ts = 0;
3859 /* mark discont if we are going to stream from another position. */
3860 if (seekpos != parse->priv->offset) {
3861 GST_DEBUG_OBJECT (parse,
3862 "mark DISCONT, we did a seek to another position");
3863 parse->priv->offset = seekpos;
3864 parse->priv->last_offset = seekpos;
3865 parse->priv->seen_keyframe = FALSE;
3866 parse->priv->discont = TRUE;
3867 parse->priv->next_ts = start_ts;
3868 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3869 parse->priv->sync_offset = seekpos;
3870 parse->priv->exact_position = accurate;
3873 /* Start streaming thread if paused */
3874 gst_pad_start_task (parse->sinkpad,
3875 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3877 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3882 GstEvent *new_event;
3883 GstBaseParseSeek *seek;
3884 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
3886 /* The only thing we need to do in PUSH-mode is to send the
3887 seek event (in bytes) to upstream. Segment / flush handling happens
3888 in corresponding src event handlers */
3889 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3890 if (seekstop >= 0 && seekstop <= seekpos)
3892 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
3893 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3895 /* store segment info so its precise details can be reconstructed when
3896 * receiving newsegment;
3897 * this matters for all details when accurate seeking,
3898 * is most useful to preserve NONE stop time otherwise */
3899 seek = g_new0 (GstBaseParseSeek, 1);
3900 seek->segment = seeksegment;
3901 seek->accurate = accurate;
3902 seek->offset = seekpos;
3903 seek->start_ts = start_ts;
3904 GST_OBJECT_LOCK (parse);
3905 /* less optimal, but preserves order */
3906 parse->priv->pending_seeks =
3907 g_slist_append (parse->priv->pending_seeks, seek);
3908 GST_OBJECT_UNLOCK (parse);
3910 res = gst_pad_push_event (parse->sinkpad, new_event);
3913 GST_OBJECT_LOCK (parse);
3914 parse->priv->pending_seeks =
3915 g_slist_remove (parse->priv->pending_seeks, seek);
3916 GST_OBJECT_UNLOCK (parse);
3922 /* handled event is ours to free */
3924 gst_event_unref (event);
3930 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
3936 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
3942 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
3948 /* Checks if bitrates are available from upstream tags so that we don't
3949 * override them later
3952 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
3954 GstTagList *taglist = NULL;
3957 gst_event_parse_tag (event, &taglist);
3959 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
3960 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
3961 parse->priv->post_min_bitrate = FALSE;
3963 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
3964 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
3965 parse->priv->post_avg_bitrate = FALSE;
3967 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
3968 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
3969 parse->priv->post_max_bitrate = FALSE;
3974 gst_base_parse_set_index (GstElement * element, GstIndex * index)
3976 GstBaseParse *parse = GST_BASE_PARSE (element);
3978 g_static_mutex_lock (&parse->priv->index_lock);
3979 if (parse->priv->index)
3980 gst_object_unref (parse->priv->index);
3982 parse->priv->index = gst_object_ref (index);
3983 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
3984 &parse->priv->index_id);
3985 parse->priv->own_index = FALSE;
3987 parse->priv->index = NULL;
3989 g_static_mutex_unlock (&parse->priv->index_lock);
3993 gst_base_parse_get_index (GstElement * element)
3995 GstBaseParse *parse = GST_BASE_PARSE (element);
3996 GstIndex *result = NULL;
3998 g_static_mutex_lock (&parse->priv->index_lock);
3999 if (parse->priv->index)
4000 result = gst_object_ref (parse->priv->index);
4001 g_static_mutex_unlock (&parse->priv->index_lock);
4006 static GstStateChangeReturn
4007 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4009 GstBaseParse *parse;
4010 GstStateChangeReturn result;
4012 parse = GST_BASE_PARSE (element);
4014 switch (transition) {
4015 case GST_STATE_CHANGE_READY_TO_PAUSED:
4016 /* If this is our own index destroy it as the
4017 * old entries might be wrong for the new stream */
4018 g_static_mutex_lock (&parse->priv->index_lock);
4019 if (parse->priv->own_index) {
4020 gst_object_unref (parse->priv->index);
4021 parse->priv->index = NULL;
4022 parse->priv->own_index = FALSE;
4025 /* If no index was created, generate one */
4026 if (G_UNLIKELY (!parse->priv->index)) {
4027 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4029 parse->priv->index = gst_index_factory_make ("memindex");
4030 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4031 &parse->priv->index_id);
4032 parse->priv->own_index = TRUE;
4034 g_static_mutex_unlock (&parse->priv->index_lock);
4040 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4042 switch (transition) {
4043 case GST_STATE_CHANGE_PAUSED_TO_READY:
4044 gst_base_parse_reset (parse);