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
229 GstActivateMode pad_mode;
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);
378 static gboolean gst_base_parse_sink_activate_push (GstPad * pad,
380 static gboolean gst_base_parse_sink_activate_pull (GstPad * pad,
382 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
384 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
386 static gboolean gst_base_parse_src_event (GstPad * pad, GstEvent * event);
387 static gboolean gst_base_parse_sink_event (GstPad * pad, GstEvent * event);
388 static gboolean gst_base_parse_query (GstPad * pad, GstQuery * query);
389 static GstCaps *gst_base_parse_sink_getcaps (GstPad * pad, GstCaps * filter);
390 static const GstQueryType *gst_base_parse_get_querytypes (GstPad * pad);
392 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstBuffer * buffer);
393 static void gst_base_parse_loop (GstPad * pad);
395 static gboolean gst_base_parse_check_frame (GstBaseParse * parse,
396 GstBaseParseFrame * frame, guint * framesize, gint * skipsize);
397 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
398 GstBaseParseFrame * frame);
400 static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse,
403 static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse,
406 static void gst_base_parse_drain (GstBaseParse * parse);
408 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
409 gboolean post_min, gboolean post_avg, gboolean post_max);
411 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
412 GstClockTime time, gboolean before, GstClockTime * _ts);
413 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
414 GstClockTime * _time, gint64 * _offset);
416 static GstFlowReturn gst_base_parse_process_fragment (GstBaseParse * parse,
419 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
422 gst_base_parse_clear_queues (GstBaseParse * parse)
424 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
425 g_slist_free (parse->priv->buffers_queued);
426 parse->priv->buffers_queued = NULL;
427 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
429 g_slist_free (parse->priv->buffers_pending);
430 parse->priv->buffers_pending = NULL;
431 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
432 g_slist_free (parse->priv->buffers_send);
433 parse->priv->buffers_send = NULL;
435 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
436 g_list_free (parse->priv->detect_buffers);
437 parse->priv->detect_buffers = NULL;
438 parse->priv->detect_buffers_size = 0;
442 gst_base_parse_finalize (GObject * object)
444 GstBaseParse *parse = GST_BASE_PARSE (object);
447 g_object_unref (parse->priv->adapter);
449 if (parse->priv->pending_segment) {
450 p_ev = &parse->priv->pending_segment;
451 gst_event_replace (p_ev, NULL);
453 if (parse->priv->close_segment) {
454 p_ev = &parse->priv->close_segment;
455 gst_event_replace (p_ev, NULL);
458 if (parse->priv->cache) {
459 gst_buffer_unref (parse->priv->cache);
460 parse->priv->cache = NULL;
463 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
465 g_list_free (parse->priv->pending_events);
466 parse->priv->pending_events = NULL;
468 g_queue_foreach (&parse->priv->queued_frames,
469 (GFunc) gst_base_parse_frame_free, NULL);
470 g_queue_clear (&parse->priv->queued_frames);
472 if (parse->priv->index) {
473 gst_object_unref (parse->priv->index);
474 parse->priv->index = NULL;
477 g_static_mutex_free (&parse->priv->index_lock);
479 gst_base_parse_clear_queues (parse);
481 G_OBJECT_CLASS (parent_class)->finalize (object);
485 gst_base_parse_class_init (GstBaseParseClass * klass)
487 GObjectClass *gobject_class;
488 GstElementClass *gstelement_class;
490 gobject_class = G_OBJECT_CLASS (klass);
491 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
492 parent_class = g_type_class_peek_parent (klass);
493 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
495 gstelement_class = (GstElementClass *) klass;
496 gstelement_class->change_state =
497 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
498 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
499 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
501 /* Default handlers */
502 klass->check_valid_frame = gst_base_parse_check_frame;
503 klass->parse_frame = gst_base_parse_parse_frame;
504 klass->src_event = gst_base_parse_src_eventfunc;
505 klass->convert = gst_base_parse_convert_default;
507 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
508 "baseparse element");
512 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
514 GstPadTemplate *pad_template;
516 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
518 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
521 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
522 g_return_if_fail (pad_template != NULL);
523 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
524 gst_pad_set_event_function (parse->sinkpad,
525 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
526 gst_pad_set_getcaps_function (parse->sinkpad,
527 GST_DEBUG_FUNCPTR (gst_base_parse_sink_getcaps));
528 gst_pad_set_chain_function (parse->sinkpad,
529 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
530 gst_pad_set_activate_function (parse->sinkpad,
531 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
532 gst_pad_set_activatepush_function (parse->sinkpad,
533 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_push));
534 gst_pad_set_activatepull_function (parse->sinkpad,
535 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_pull));
536 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
538 GST_DEBUG_OBJECT (parse, "sinkpad created");
541 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
542 g_return_if_fail (pad_template != NULL);
543 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
544 gst_pad_set_event_function (parse->srcpad,
545 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
546 gst_pad_set_query_type_function (parse->srcpad,
547 GST_DEBUG_FUNCPTR (gst_base_parse_get_querytypes));
548 gst_pad_set_query_function (parse->srcpad,
549 GST_DEBUG_FUNCPTR (gst_base_parse_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_ACTIVATE_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, GstEvent * event)
871 GstBaseParseClass *bclass;
872 gboolean handled = FALSE;
875 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
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, event);
912 gst_object_unref (parse);
913 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_src_event:
1125 * @pad: #GstPad that received the event.
1126 * @event: #GstEvent that was received.
1128 * Handler for source pad events.
1130 * Returns: TRUE if the event was handled.
1133 gst_base_parse_src_event (GstPad * pad, GstEvent * event)
1135 GstBaseParse *parse;
1136 GstBaseParseClass *bclass;
1137 gboolean handled = FALSE;
1138 gboolean ret = TRUE;
1140 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
1141 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1143 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1144 GST_EVENT_TYPE_NAME (event));
1146 if (bclass->src_event)
1147 handled = bclass->src_event (parse, event);
1150 ret = gst_pad_event_default (pad, event);
1152 gst_object_unref (parse);
1157 gst_base_parse_is_seekable (GstBaseParse * parse)
1159 /* FIXME: could do more here, e.g. check index or just send data from 0
1160 * in pull mode and let decoder/sink clip */
1161 return parse->priv->syncable;
1164 /* gst_base_parse_src_eventfunc:
1165 * @parse: #GstBaseParse.
1166 * @event: #GstEvent that was received.
1168 * Default srcpad event handler.
1170 * Returns: TRUE if the event was handled and can be dropped.
1173 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1175 gboolean handled = FALSE;
1177 switch (GST_EVENT_TYPE (event)) {
1178 case GST_EVENT_SEEK:
1180 if (gst_base_parse_is_seekable (parse)) {
1181 handled = gst_base_parse_handle_seek (parse, event);
1193 * gst_base_parse_convert_default:
1194 * @parse: #GstBaseParse.
1195 * @src_format: #GstFormat describing the source format.
1196 * @src_value: Source value to be converted.
1197 * @dest_format: #GstFormat defining the converted format.
1198 * @dest_value: Pointer where the conversion result will be put.
1200 * Default implementation of "convert" vmethod in #GstBaseParse class.
1202 * Returns: TRUE if conversion was successful.
1207 gst_base_parse_convert_default (GstBaseParse * parse,
1208 GstFormat src_format,
1209 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1211 gboolean ret = FALSE;
1212 guint64 bytes, duration;
1214 if (G_UNLIKELY (src_format == dest_format)) {
1215 *dest_value = src_value;
1219 if (G_UNLIKELY (src_value == -1)) {
1224 if (G_UNLIKELY (src_value == 0)) {
1229 /* need at least some frames */
1230 if (!parse->priv->framecount)
1233 duration = parse->priv->acc_duration / GST_MSECOND;
1234 bytes = parse->priv->bytecount;
1236 if (G_UNLIKELY (!duration || !bytes))
1239 if (src_format == GST_FORMAT_BYTES) {
1240 if (dest_format == GST_FORMAT_TIME) {
1241 /* BYTES -> TIME conversion */
1242 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1243 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1244 *dest_value *= GST_MSECOND;
1245 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1246 *dest_value / GST_MSECOND);
1249 } else if (src_format == GST_FORMAT_TIME) {
1250 if (dest_format == GST_FORMAT_BYTES) {
1251 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1252 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1254 GST_DEBUG_OBJECT (parse,
1255 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1256 src_value / GST_MSECOND, *dest_value);
1259 } else if (src_format == GST_FORMAT_DEFAULT) {
1260 /* DEFAULT == frame-based */
1261 if (dest_format == GST_FORMAT_TIME) {
1262 if (parse->priv->fps_den) {
1263 *dest_value = gst_util_uint64_scale (src_value,
1264 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1267 } else if (dest_format == GST_FORMAT_BYTES) {
1275 gst_base_parse_update_duration (GstBaseParse * baseparse)
1278 GstBaseParse *parse;
1280 parse = GST_BASE_PARSE (baseparse);
1282 peer = gst_pad_get_peer (parse->sinkpad);
1284 gboolean qres = FALSE;
1285 gint64 ptot, dest_value;
1287 qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot);
1288 gst_object_unref (GST_OBJECT (peer));
1290 if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1291 GST_FORMAT_TIME, &dest_value)) {
1293 /* inform if duration changed, but try to avoid spamming */
1294 parse->priv->estimated_drift +=
1295 dest_value - parse->priv->estimated_duration;
1296 if (parse->priv->estimated_drift > GST_SECOND ||
1297 parse->priv->estimated_drift < -GST_SECOND) {
1298 gst_element_post_message (GST_ELEMENT (parse),
1299 gst_message_new_duration (GST_OBJECT (parse),
1300 GST_FORMAT_TIME, dest_value));
1301 parse->priv->estimated_drift = 0;
1303 parse->priv->estimated_duration = dest_value;
1304 GST_LOG_OBJECT (parse,
1305 "updated estimated duration to %" GST_TIME_FORMAT,
1306 GST_TIME_ARGS (dest_value));
1313 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1314 gboolean post_avg, gboolean post_max)
1316 GstTagList *taglist = NULL;
1318 if (post_min && parse->priv->post_min_bitrate) {
1319 taglist = gst_tag_list_new ();
1321 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1322 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1325 if (post_avg && parse->priv->post_avg_bitrate) {
1326 if (taglist == NULL)
1327 taglist = gst_tag_list_new ();
1329 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1330 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1331 parse->priv->avg_bitrate, NULL);
1334 if (post_max && parse->priv->post_max_bitrate) {
1335 if (taglist == NULL)
1336 taglist = gst_tag_list_new ();
1338 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1339 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1342 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1343 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1344 parse->priv->max_bitrate);
1346 if (taglist != NULL) {
1347 gst_element_found_tags_for_pad (GST_ELEMENT_CAST (parse), parse->srcpad,
1352 /* gst_base_parse_update_bitrates:
1353 * @parse: #GstBaseParse.
1354 * @buffer: Current frame as a #GstBuffer
1356 * Keeps track of the minimum and maximum bitrates, and also maintains a
1357 * running average bitrate of the stream so far.
1360 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1362 /* Only update the tag on a 10 kbps delta */
1363 static const gint update_threshold = 10000;
1365 guint64 data_len, frame_dur;
1366 gint overhead, frame_bitrate, old_avg_bitrate;
1367 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1368 GstBuffer *buffer = frame->buffer;
1370 overhead = frame->overhead;
1374 data_len = gst_buffer_get_size (buffer) - overhead;
1375 parse->priv->data_bytecount += data_len;
1377 /* duration should be valid by now,
1378 * either set by subclass or maybe based on fps settings */
1379 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1380 /* Calculate duration of a frame from buffer properties */
1381 frame_dur = GST_BUFFER_DURATION (buffer);
1382 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1383 parse->priv->acc_duration;
1386 /* No way to figure out frame duration (is this even possible?) */
1390 /* override if subclass provided bitrate, e.g. metadata based */
1391 if (parse->priv->bitrate) {
1392 parse->priv->avg_bitrate = parse->priv->bitrate;
1393 /* spread this (confirmed) info ASAP */
1394 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1395 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1399 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1403 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1404 parse->priv->avg_bitrate);
1406 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1408 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1409 /* always post all at threshold time */
1410 update_min = update_max = update_avg = TRUE;
1413 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1414 if (frame_bitrate < parse->priv->min_bitrate) {
1415 parse->priv->min_bitrate = frame_bitrate;
1419 if (frame_bitrate > parse->priv->max_bitrate) {
1420 parse->priv->max_bitrate = frame_bitrate;
1424 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1425 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1426 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1431 if ((update_min || update_avg || update_max))
1432 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1434 /* If average bitrate changes that much and no valid (time) duration provided,
1435 * then post a new duration message so applications can update their cached
1437 if (update_avg && !(parse->priv->duration_fmt == GST_FORMAT_TIME &&
1438 GST_CLOCK_TIME_IS_VALID (parse->priv->duration)))
1439 gst_element_post_message (GST_ELEMENT (parse),
1440 gst_message_new_duration (GST_OBJECT (parse), GST_FORMAT_TIME, -1));
1447 * gst_base_parse_add_index_entry:
1448 * @parse: #GstBaseParse.
1449 * @offset: offset of entry
1450 * @ts: timestamp associated with offset
1451 * @key: whether entry refers to keyframe
1452 * @force: add entry disregarding sanity checks
1454 * Adds an entry to the index associating @offset to @ts. It is recommended
1455 * to only add keyframe entries. @force allows to bypass checks, such as
1456 * whether the stream is (upstream) seekable, another entry is already "close"
1457 * to the new entry, etc.
1459 * Returns: #gboolean indicating whether entry was added
1464 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1465 GstClockTime ts, gboolean key, gboolean force)
1467 gboolean ret = FALSE;
1468 GstIndexAssociation associations[2];
1470 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1471 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1473 if (G_LIKELY (!force)) {
1475 if (!parse->priv->upstream_seekable) {
1476 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1480 /* FIXME need better helper data structure that handles these issues
1481 * related to ongoing collecting of index entries */
1482 if (parse->priv->index_last_offset >= (gint64) offset) {
1483 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1484 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1488 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1489 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1490 parse->priv->idx_interval) {
1491 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1492 GST_TIME_ARGS (parse->priv->index_last_ts));
1496 /* if last is not really the last one */
1497 if (!parse->priv->index_last_valid) {
1498 GstClockTime prev_ts;
1500 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1501 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1502 GST_DEBUG_OBJECT (parse,
1503 "entry too close to existing entry %" GST_TIME_FORMAT,
1504 GST_TIME_ARGS (prev_ts));
1505 parse->priv->index_last_offset = offset;
1506 parse->priv->index_last_ts = ts;
1512 associations[0].format = GST_FORMAT_TIME;
1513 associations[0].value = ts;
1514 associations[1].format = GST_FORMAT_BYTES;
1515 associations[1].value = offset;
1517 /* index might change on-the-fly, although that would be nutty app ... */
1518 g_static_mutex_lock (&parse->priv->index_lock);
1519 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1520 (key) ? GST_ASSOCIATION_FLAG_KEY_UNIT : GST_ASSOCIATION_FLAG_DELTA_UNIT,
1521 2, (const GstIndexAssociation *) &associations);
1522 g_static_mutex_unlock (&parse->priv->index_lock);
1525 parse->priv->index_last_offset = offset;
1526 parse->priv->index_last_ts = ts;
1535 /* check for seekable upstream, above and beyond a mere query */
1537 gst_base_parse_check_seekability (GstBaseParse * parse)
1540 gboolean seekable = FALSE;
1541 gint64 start = -1, stop = -1;
1542 guint idx_interval = 0;
1544 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1545 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1546 GST_DEBUG_OBJECT (parse, "seeking query failed");
1550 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1552 /* try harder to query upstream size if we didn't get it the first time */
1553 if (seekable && stop == -1) {
1554 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1555 gst_pad_query_peer_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1558 /* if upstream doesn't know the size, it's likely that it's not seekable in
1559 * practice even if it technically may be seekable */
1560 if (seekable && (start != 0 || stop <= start)) {
1561 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1565 /* let's not put every single frame into our index */
1567 if (stop < 10 * 1024 * 1024)
1569 else if (stop < 100 * 1024 * 1024)
1572 idx_interval = 1000;
1576 gst_query_unref (query);
1578 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1579 G_GUINT64_FORMAT ")", seekable, start, stop);
1580 parse->priv->upstream_seekable = seekable;
1581 parse->priv->upstream_size = seekable ? stop : 0;
1583 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1584 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1587 /* some misc checks on upstream */
1589 gst_base_parse_check_upstream (GstBaseParse * parse)
1593 if (gst_pad_query_peer_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
1594 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1595 /* upstream has one, accept it also, and no further updates */
1596 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1597 parse->priv->upstream_has_duration = TRUE;
1600 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1601 parse->priv->upstream_has_duration);
1604 /* checks src caps to determine if dealing with audio or video */
1605 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1607 gst_base_parse_check_media (GstBaseParse * parse)
1612 caps = gst_pad_get_current_caps (parse->srcpad);
1613 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1614 parse->priv->is_video =
1615 g_str_has_prefix (gst_structure_get_name (s), "video");
1617 /* historical default */
1618 parse->priv->is_video = FALSE;
1621 gst_caps_unref (caps);
1623 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1626 /* takes ownership of frame */
1628 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1630 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1631 /* frame allocated on the heap, we can just take ownership */
1632 g_queue_push_tail (&parse->priv->queued_frames, frame);
1633 GST_TRACE ("queued frame %p", frame);
1635 GstBaseParseFrame *copy;
1637 /* probably allocated on the stack, must make a proper copy */
1638 copy = gst_base_parse_frame_copy (frame);
1639 g_queue_push_tail (&parse->priv->queued_frames, copy);
1640 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1641 gst_base_parse_frame_free (frame);
1645 /* gst_base_parse_handle_and_push_buffer:
1646 * @parse: #GstBaseParse.
1647 * @klass: #GstBaseParseClass.
1648 * @frame: (transfer full): a #GstBaseParseFrame
1650 * Parses the frame from given buffer and pushes it forward. Also performs
1651 * timestamp handling and checks the segment limits.
1653 * This is called with srcpad STREAM_LOCK held.
1655 * Returns: #GstFlowReturn
1657 static GstFlowReturn
1658 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1659 GstBaseParseClass * klass, GstBaseParseFrame * frame)
1665 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1667 buffer = frame->buffer;
1669 if (parse->priv->discont) {
1670 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1671 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1672 parse->priv->discont = FALSE;
1675 /* some one-time start-up */
1676 if (G_UNLIKELY (!parse->priv->framecount)) {
1677 gst_base_parse_check_seekability (parse);
1678 gst_base_parse_check_upstream (parse);
1681 GST_LOG_OBJECT (parse,
1682 "parsing frame at offset %" G_GUINT64_FORMAT
1683 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
1684 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1685 gst_buffer_get_size (buffer));
1687 /* use default handler to provide initial (upstream) metadata */
1688 gst_base_parse_parse_frame (parse, frame);
1690 /* store offset as it might get overwritten */
1691 offset = GST_BUFFER_OFFSET (buffer);
1692 ret = klass->parse_frame (parse, frame);
1694 buffer = frame->buffer;
1695 /* subclass must play nice */
1696 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1698 /* check if subclass/format can provide ts.
1699 * If so, that allows and enables extra seek and duration determining options */
1700 if (G_UNLIKELY (parse->priv->first_frame_offset < 0 && ret == GST_FLOW_OK)) {
1701 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1702 && parse->priv->pad_mode == GST_ACTIVATE_PULL) {
1703 parse->priv->first_frame_offset = offset;
1704 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1705 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1706 " for first frame at offset %" G_GINT64_FORMAT,
1707 GST_TIME_ARGS (parse->priv->first_frame_ts),
1708 parse->priv->first_frame_offset);
1709 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1711 GstClockTime last_ts = G_MAXINT64;
1713 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1714 gst_base_parse_locate_time (parse, &last_ts, &off);
1715 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1716 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1719 /* disable further checks */
1720 parse->priv->first_frame_offset = 0;
1724 /* again use default handler to add missing metadata;
1725 * we may have new information on frame properties */
1726 gst_base_parse_parse_frame (parse, frame);
1727 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1728 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1729 parse->priv->next_ts =
1730 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1732 /* we lost track, do not produce bogus time next time around
1733 * (probably means parser subclass has given up on parsing as well) */
1734 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1735 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1738 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1739 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1740 gst_base_parse_add_index_entry (parse, offset,
1741 GST_BUFFER_TIMESTAMP (buffer),
1742 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1744 /* First buffers are dropped, this means that the subclass needs more
1745 * frames to decide on the format and queues them internally */
1746 /* convert internal flow to OK and mark discont for the next buffer. */
1747 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1748 gst_base_parse_frame_free (frame);
1750 } else if (ret == GST_BASE_PARSE_FLOW_QUEUED) {
1751 gst_base_parse_queue_frame (parse, frame);
1753 } else if (ret != GST_FLOW_OK) {
1757 /* All OK, push queued frames if there are any */
1758 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1759 GstBaseParseFrame *queued_frame;
1761 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1762 gst_base_parse_push_frame (parse, queued_frame);
1766 return gst_base_parse_push_frame (parse, frame);
1770 * gst_base_parse_push_frame:
1771 * @parse: #GstBaseParse.
1772 * @frame: (transfer full): a #GstBaseParseFrame
1774 * Pushes the frame downstream, sends any pending events and
1775 * does some timestamp and segment handling. Takes ownership
1776 * of @frame and will clear it (if it was initialised with
1777 * gst_base_parse_frame_init()) or free it.
1779 * This must be called with sinkpad STREAM_LOCK held.
1781 * Returns: #GstFlowReturn
1786 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1788 GstFlowReturn ret = GST_FLOW_OK;
1789 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1790 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1791 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1795 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1796 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1798 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1800 buffer = frame->buffer;
1802 GST_LOG_OBJECT (parse,
1803 "processing buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT
1804 ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer),
1805 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1806 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1809 size = gst_buffer_get_size (buffer);
1810 parse->priv->bytecount += size;
1811 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1812 parse->priv->framecount++;
1813 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1814 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1817 /* 0 means disabled */
1818 if (parse->priv->update_interval < 0)
1819 parse->priv->update_interval = 50;
1820 else if (parse->priv->update_interval > 0 &&
1821 (parse->priv->framecount % parse->priv->update_interval) == 0)
1822 gst_base_parse_update_duration (parse);
1824 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1825 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1826 if (last_start != GST_CLOCK_TIME_NONE
1827 && GST_BUFFER_DURATION_IS_VALID (buffer))
1828 last_stop = last_start + GST_BUFFER_DURATION (buffer);
1830 /* should have caps by now */
1831 g_return_val_if_fail (gst_pad_has_current_caps (parse->srcpad),
1834 /* segment adjustment magic; only if we are running the whole show */
1835 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
1836 (parse->priv->pad_mode == GST_ACTIVATE_PULL ||
1837 parse->priv->upstream_seekable)) {
1838 /* segment times are typically estimates,
1839 * actual frame data might lead subclass to different timestamps,
1840 * so override segment start from what is supplied there */
1841 if (G_UNLIKELY (parse->priv->pending_segment && !parse->priv->exact_position
1842 && GST_CLOCK_TIME_IS_VALID (last_start))) {
1843 gst_event_unref (parse->priv->pending_segment);
1844 parse->segment.start =
1845 MIN ((guint64) last_start, (guint64) parse->segment.stop);
1847 GST_DEBUG_OBJECT (parse,
1848 "adjusting pending segment start to %" GST_TIME_FORMAT,
1849 GST_TIME_ARGS (parse->segment.start));
1851 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
1853 /* handle gaps, e.g. non-zero start-time, in as much not handled by above */
1854 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
1855 GST_CLOCK_TIME_IS_VALID (last_start)) {
1856 GstClockTimeDiff diff;
1858 /* only send newsegments with increasing start times,
1859 * otherwise if these go back and forth downstream (sinks) increase
1860 * accumulated time and running_time */
1861 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
1862 if (G_UNLIKELY (diff > 2 * GST_SECOND
1863 && last_start > parse->segment.start
1864 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
1865 || last_start < parse->segment.stop))) {
1867 GST_DEBUG_OBJECT (parse,
1868 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
1869 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
1870 "Sending updated NEWSEGMENT events", diff,
1871 GST_TIME_ARGS (parse->segment.position),
1872 GST_TIME_ARGS (last_start));
1874 if (G_UNLIKELY (parse->priv->pending_segment)) {
1875 gst_event_unref (parse->priv->pending_segment);
1876 parse->segment.start = last_start;
1877 parse->segment.time = last_start;
1878 parse->priv->pending_segment =
1879 gst_event_new_segment (&parse->segment);
1881 /* skip gap FIXME */
1882 gst_pad_push_event (parse->srcpad,
1883 gst_event_new_segment (&parse->segment));
1885 parse->segment.position = last_start;
1890 /* and should then also be linked downstream, so safe to send some events */
1891 if (G_UNLIKELY (parse->priv->close_segment)) {
1892 /* only set up by loop */
1893 GST_DEBUG_OBJECT (parse, "loop sending close segment");
1894 gst_pad_push_event (parse->srcpad, parse->priv->close_segment);
1895 parse->priv->close_segment = NULL;
1897 if (G_UNLIKELY (parse->priv->pending_segment)) {
1898 GstEvent *pending_segment;
1900 pending_segment = parse->priv->pending_segment;
1901 parse->priv->pending_segment = NULL;
1903 GST_DEBUG_OBJECT (parse, "%s push pending segment",
1904 parse->priv->pad_mode == GST_ACTIVATE_PULL ? "loop" : "chain");
1905 gst_pad_push_event (parse->srcpad, pending_segment);
1907 /* have caps; check identity */
1908 gst_base_parse_check_media (parse);
1911 /* update bitrates and optionally post corresponding tags
1912 * (following newsegment) */
1913 gst_base_parse_update_bitrates (parse, frame);
1915 if (G_UNLIKELY (parse->priv->pending_events)) {
1918 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
1919 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
1921 g_list_free (parse->priv->pending_events);
1922 parse->priv->pending_events = NULL;
1925 if (klass->pre_push_frame) {
1926 ret = klass->pre_push_frame (parse, frame);
1928 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
1931 /* take final ownership of frame buffer */
1932 buffer = frame->buffer;
1933 frame->buffer = NULL;
1935 /* subclass must play nice */
1936 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1938 parse->priv->seen_keyframe |= parse->priv->is_video &&
1939 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
1941 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
1942 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1943 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
1944 GST_BUFFER_TIMESTAMP (buffer) >
1945 parse->segment.stop + parse->priv->lead_out_ts) {
1946 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
1948 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1949 GST_BUFFER_DURATION_IS_VALID (buffer) &&
1950 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
1951 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
1952 parse->priv->lead_in_ts < parse->segment.start) {
1953 if (parse->priv->seen_keyframe) {
1954 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
1957 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
1958 ret = GST_BASE_PARSE_FLOW_DROPPED;
1965 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1966 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
1967 gst_buffer_unref (buffer);
1969 } else if (ret == GST_FLOW_OK) {
1970 if (parse->segment.rate > 0.0) {
1971 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
1973 ret = gst_pad_push (parse->srcpad, buffer);
1974 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
1976 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
1978 parse->priv->buffers_queued =
1979 g_slist_prepend (parse->priv->buffers_queued, buffer);
1983 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
1984 size, gst_flow_get_name (ret));
1985 gst_buffer_unref (buffer);
1986 /* if we are not sufficiently in control, let upstream decide on EOS */
1987 if (ret == GST_FLOW_EOS &&
1988 (parse->priv->passthrough ||
1989 (parse->priv->pad_mode == GST_ACTIVATE_PUSH &&
1990 !parse->priv->upstream_seekable)))
1994 /* Update current running segment position */
1995 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
1996 parse->segment.position < last_stop)
1997 parse->segment.position = last_stop;
1999 gst_base_parse_frame_free (frame);
2005 /* gst_base_parse_drain:
2007 * Drains the adapter until it is empty. It decreases the min_frame_size to
2008 * match the current adapter size and calls chain method until the adapter
2009 * is emptied or chain returns with error.
2012 gst_base_parse_drain (GstBaseParse * parse)
2016 GST_DEBUG_OBJECT (parse, "draining");
2017 parse->priv->drain = TRUE;
2020 avail = gst_adapter_available (parse->priv->adapter);
2024 if (gst_base_parse_chain (parse->sinkpad, NULL) != GST_FLOW_OK) {
2028 /* nothing changed, maybe due to truncated frame; break infinite loop */
2029 if (avail == gst_adapter_available (parse->priv->adapter)) {
2030 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2031 gst_adapter_clear (parse->priv->adapter);
2035 parse->priv->drain = FALSE;
2038 /* gst_base_parse_send_buffers
2040 * Sends buffers collected in send_buffers downstream, and ensures that list
2041 * is empty at the end (errors or not).
2043 static GstFlowReturn
2044 gst_base_parse_send_buffers (GstBaseParse * parse)
2046 GSList *send = NULL;
2048 GstFlowReturn ret = GST_FLOW_OK;
2050 send = parse->priv->buffers_send;
2054 buf = GST_BUFFER_CAST (send->data);
2055 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
2056 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2057 ", offset %" G_GINT64_FORMAT, buf,
2058 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
2059 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2061 /* iterate output queue an push downstream */
2062 ret = gst_pad_push (parse->srcpad, buf);
2063 send = g_slist_delete_link (send, send);
2065 /* clear any leftover if error */
2066 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2068 buf = GST_BUFFER_CAST (send->data);
2069 gst_buffer_unref (buf);
2070 send = g_slist_delete_link (send, send);
2075 parse->priv->buffers_send = send;
2080 /* gst_base_parse_process_fragment:
2082 * Processes a reverse playback (forward) fragment:
2083 * - append head of last fragment that was skipped to current fragment data
2084 * - drain the resulting current fragment data (i.e. repeated chain)
2085 * - add time/duration (if needed) to frames queued by chain
2086 * - push queued data
2088 static GstFlowReturn
2089 gst_base_parse_process_fragment (GstBaseParse * parse, gboolean push_only)
2092 GstFlowReturn ret = GST_FLOW_OK;
2093 gboolean seen_key = FALSE, seen_delta = FALSE;
2099 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2100 while (parse->priv->buffers_pending) {
2101 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2102 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2103 gst_buffer_get_size (buf));
2104 gst_adapter_push (parse->priv->adapter, buf);
2105 parse->priv->buffers_pending =
2106 g_slist_delete_link (parse->priv->buffers_pending,
2107 parse->priv->buffers_pending);
2110 /* invalidate so no fall-back timestamping is performed;
2111 * ok if taken from subclass or upstream */
2112 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2113 /* prevent it hanging around stop all the time */
2114 parse->segment.position = GST_CLOCK_TIME_NONE;
2116 parse->priv->discont = TRUE;
2118 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2119 /* initial skipped data is added to buffers_pending */
2120 gst_base_parse_drain (parse);
2123 if (parse->priv->buffers_send) {
2124 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2125 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2128 /* add metadata (if needed to queued buffers */
2129 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2130 GST_TIME_ARGS (parse->priv->last_ts));
2131 while (parse->priv->buffers_queued) {
2132 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2134 /* no touching if upstream or parsing provided time */
2135 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2136 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2137 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2138 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2139 GST_BUFFER_DURATION_IS_VALID (buf)) {
2140 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2141 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2143 parse->priv->last_ts = 0;
2144 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2145 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2146 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2148 /* no idea, very bad */
2149 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2152 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2154 /* reverse order for ascending sending */
2155 /* send downstream at keyframe not preceded by a keyframe
2156 * (e.g. that should identify start of collection of IDR nals) */
2157 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2159 ret = gst_base_parse_send_buffers (parse);
2160 /* if a problem, throw all to sending */
2161 if (ret != GST_FLOW_OK) {
2162 parse->priv->buffers_send =
2163 g_slist_reverse (parse->priv->buffers_queued);
2164 parse->priv->buffers_queued = NULL;
2173 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2175 parse->priv->buffers_send =
2176 g_slist_prepend (parse->priv->buffers_send, buf);
2177 parse->priv->buffers_queued =
2178 g_slist_delete_link (parse->priv->buffers_queued,
2179 parse->priv->buffers_queued);
2182 /* audio may have all marked as keyframe, so arrange to send here */
2184 ret = gst_base_parse_send_buffers (parse);
2186 /* any trailing unused no longer usable (ideally none) */
2187 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2188 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2189 gst_adapter_available (parse->priv->adapter));
2190 gst_adapter_clear (parse->priv->adapter);
2196 /* small helper that checks whether we have been trying to resync too long */
2197 static inline GstFlowReturn
2198 gst_base_parse_check_sync (GstBaseParse * parse)
2200 if (G_UNLIKELY (parse->priv->discont &&
2201 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2202 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2203 ("Failed to parse stream"), (NULL));
2204 return GST_FLOW_ERROR;
2210 static GstFlowReturn
2211 gst_base_parse_chain (GstPad * pad, GstBuffer * buffer)
2213 GstBaseParseClass *bclass;
2214 GstBaseParse *parse;
2215 GstFlowReturn ret = GST_FLOW_OK;
2216 GstBuffer *outbuf = NULL;
2217 GstBuffer *tmpbuf = NULL;
2221 guint old_min_size = 0, min_size, av;
2222 GstClockTime timestamp;
2223 GstBaseParseFrame *frame;
2225 parse = GST_BASE_PARSE (GST_OBJECT_PARENT (pad));
2226 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2228 if (parse->priv->detecting) {
2229 GstBuffer *detect_buf;
2231 if (parse->priv->detect_buffers_size == 0) {
2232 detect_buf = gst_buffer_ref (buffer);
2237 detect_buf = gst_buffer_new ();
2239 for (l = parse->priv->detect_buffers; l; l = l->next) {
2240 gsize tmpsize = gst_buffer_get_size (l->data);
2242 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
2243 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
2247 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
2248 offset, gst_buffer_get_size (buffer));
2251 ret = bclass->detect (parse, detect_buf);
2252 gst_buffer_unref (detect_buf);
2254 if (ret == GST_FLOW_OK) {
2257 /* Detected something */
2258 parse->priv->detecting = FALSE;
2260 for (l = parse->priv->detect_buffers; l; l = l->next) {
2261 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2263 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2264 GST_BUFFER_CAST (l->data));
2266 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2268 g_list_free (parse->priv->detect_buffers);
2269 parse->priv->detect_buffers = NULL;
2270 parse->priv->detect_buffers_size = 0;
2272 if (ret != GST_FLOW_OK) {
2276 /* Handle the current buffer */
2277 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2278 /* Still detecting, append buffer or error out if draining */
2280 if (parse->priv->drain) {
2281 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2282 return GST_FLOW_ERROR;
2283 } else if (parse->priv->flushing) {
2284 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2286 g_list_free (parse->priv->detect_buffers);
2287 parse->priv->detect_buffers = NULL;
2288 parse->priv->detect_buffers_size = 0;
2290 parse->priv->detect_buffers =
2291 g_list_append (parse->priv->detect_buffers, buffer);
2292 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
2296 /* Something went wrong, subclass responsible for error reporting */
2300 /* And now handle the current buffer if detection worked */
2303 frame = &parse->priv->frame;
2305 if (G_LIKELY (buffer)) {
2306 GST_LOG_OBJECT (parse,
2307 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT,
2308 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer));
2309 if (G_UNLIKELY (parse->priv->passthrough)) {
2310 gst_base_parse_frame_init (frame);
2311 frame->buffer = gst_buffer_make_writable (buffer);
2312 return gst_base_parse_push_frame (parse, frame);
2314 /* upstream feeding us in reverse playback;
2315 * gather each fragment, then process it in single run */
2316 if (parse->segment.rate < 0.0) {
2317 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2318 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2319 ret = gst_base_parse_process_fragment (parse, FALSE);
2321 gst_adapter_push (parse->priv->adapter, buffer);
2324 gst_adapter_push (parse->priv->adapter, buffer);
2327 if (G_UNLIKELY (buffer &&
2328 GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2329 frame->_private_flags |= GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
2330 gst_base_parse_frame_free (frame);
2333 /* Parse and push as many frames as possible */
2334 /* Stop either when adapter is empty or we are flushing */
2335 while (!parse->priv->flushing) {
2338 /* maintain frame state for a single frame parsing round across _chain calls,
2339 * so only init when needed */
2340 if (!frame->_private_flags)
2341 gst_base_parse_frame_init (frame);
2343 tmpbuf = gst_buffer_new ();
2346 /* Synchronization loop */
2348 /* note: if subclass indicates MAX fsize,
2349 * this will not likely be available anyway ... */
2350 min_size = MAX (parse->priv->min_frame_size, fsize);
2351 av = gst_adapter_available (parse->priv->adapter);
2353 /* loop safety check */
2354 if (G_UNLIKELY (old_min_size >= min_size))
2356 old_min_size = min_size;
2358 if (G_UNLIKELY (parse->priv->drain)) {
2360 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2361 if (G_UNLIKELY (!min_size)) {
2362 gst_buffer_unref (tmpbuf);
2367 /* Collect at least min_frame_size bytes */
2368 if (av < min_size) {
2369 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)",
2371 gst_buffer_unref (tmpbuf);
2375 /* always pass all available data */
2376 data = gst_adapter_map (parse->priv->adapter, av);
2377 gst_buffer_take_memory (tmpbuf, -1,
2378 gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY,
2379 (gpointer) data, NULL, av, 0, av));
2380 GST_BUFFER_OFFSET (tmpbuf) = parse->priv->offset;
2382 if (parse->priv->discont) {
2383 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2384 GST_BUFFER_FLAG_SET (tmpbuf, GST_BUFFER_FLAG_DISCONT);
2388 gst_base_parse_frame_update (parse, frame, tmpbuf);
2389 res = bclass->check_valid_frame (parse, frame, &fsize, &skip);
2390 gst_adapter_unmap (parse->priv->adapter, 0);
2391 gst_buffer_replace (&frame->buffer, NULL);
2392 gst_buffer_remove_memory_range (tmpbuf, 0, -1);
2394 if (gst_adapter_available (parse->priv->adapter) < fsize) {
2395 GST_DEBUG_OBJECT (parse, "found valid frame but not enough data"
2396 " available (only %" G_GSIZE_FORMAT " bytes)",
2397 gst_adapter_available (parse->priv->adapter));
2398 gst_buffer_unref (tmpbuf);
2401 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2405 /* subclass didn't touch this value. By default we skip 1 byte */
2409 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2410 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2411 /* reverse playback, and no frames found yet, so we are skipping
2412 * the leading part of a fragment, which may form the tail of
2413 * fragment coming later, hopefully subclass skips efficiently ... */
2414 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2415 outbuf = gst_adapter_take_buffer (parse->priv->adapter, skip);
2416 outbuf = gst_buffer_make_writable (outbuf);
2417 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
2418 parse->priv->buffers_pending =
2419 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2422 gst_adapter_flush (parse->priv->adapter, skip);
2424 parse->priv->offset += skip;
2425 if (!parse->priv->discont)
2426 parse->priv->sync_offset = parse->priv->offset;
2427 parse->priv->discont = TRUE;
2428 /* something changed least; nullify loop check */
2431 /* skip == 0 should imply subclass set min_size to need more data;
2432 * we check this shortly */
2433 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2434 gst_buffer_unref (tmpbuf);
2438 gst_buffer_unref (tmpbuf);
2442 /* Subclass found the sync, but still wants to skip some data */
2443 GST_LOG_OBJECT (parse, "skipping %d bytes", skip);
2444 gst_adapter_flush (parse->priv->adapter, skip);
2445 parse->priv->offset += skip;
2448 /* Grab lock to prevent a race with FLUSH_START handler */
2449 GST_PAD_STREAM_LOCK (parse->srcpad);
2451 /* FLUSH_START event causes the "flushing" flag to be set. In this
2452 * case we can leave the frame pushing loop */
2453 if (parse->priv->flushing) {
2454 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2458 /* move along with upstream timestamp (if any),
2459 * but interpolate in between */
2460 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2461 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2462 (parse->priv->prev_ts != timestamp)) {
2463 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2466 /* FIXME: Would it be more efficient to make a subbuffer instead? */
2467 outbuf = gst_adapter_take_buffer (parse->priv->adapter, fsize);
2468 outbuf = gst_buffer_make_writable (outbuf);
2470 /* Subclass may want to know the data offset */
2471 GST_BUFFER_OFFSET (outbuf) = parse->priv->offset;
2472 parse->priv->offset += fsize;
2473 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2474 GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
2476 frame->buffer = outbuf;
2477 ret = gst_base_parse_handle_and_push_frame (parse, bclass, frame);
2478 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2480 if (ret != GST_FLOW_OK) {
2481 GST_LOG_OBJECT (parse, "push returned %d", ret);
2487 GST_LOG_OBJECT (parse, "chain leaving");
2493 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2494 ("min_size evolution %d -> %d; breaking to avoid looping",
2495 old_min_size, min_size));
2496 return GST_FLOW_ERROR;
2500 /* pull @size bytes at current offset,
2501 * i.e. at least try to and possibly return a shorter buffer if near the end */
2502 static GstFlowReturn
2503 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2504 GstBuffer ** buffer)
2506 GstFlowReturn ret = GST_FLOW_OK;
2508 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2510 /* Caching here actually makes much less difference than one would expect.
2511 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2512 if (parse->priv->cache) {
2513 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2514 gint cache_size = gst_buffer_get_size (parse->priv->cache);
2516 if (cache_offset <= parse->priv->offset &&
2517 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2518 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
2519 parse->priv->offset - cache_offset, size);
2520 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2523 /* not enough data in the cache, free cache and get a new one */
2524 gst_buffer_unref (parse->priv->cache);
2525 parse->priv->cache = NULL;
2528 /* refill the cache */
2530 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2531 64 * 1024), &parse->priv->cache);
2532 if (ret != GST_FLOW_OK) {
2533 parse->priv->cache = NULL;
2537 if (gst_buffer_get_size (parse->priv->cache) >= size) {
2539 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
2541 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2545 /* Not possible to get enough data, try a last time with
2546 * requesting exactly the size we need */
2547 gst_buffer_unref (parse->priv->cache);
2548 parse->priv->cache = NULL;
2550 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2551 &parse->priv->cache);
2553 if (ret != GST_FLOW_OK) {
2554 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2559 if (gst_buffer_get_size (parse->priv->cache) < size) {
2560 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2561 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
2562 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
2564 *buffer = parse->priv->cache;
2565 parse->priv->cache = NULL;
2571 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
2572 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2577 static GstFlowReturn
2578 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2581 GstClockTime ts = 0;
2585 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2586 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2587 parse->priv->last_offset);
2589 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2590 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2591 GST_TIME_ARGS (parse->segment.start));
2596 /* last fragment started at last_offset / last_ts;
2597 * seek back 10s capped at 1MB */
2598 if (parse->priv->last_ts >= 10 * GST_SECOND)
2599 ts = parse->priv->last_ts - 10 * GST_SECOND;
2600 /* if we are exact now, we will be more so going backwards */
2601 if (parse->priv->exact_position) {
2602 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2604 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2605 GST_FORMAT_BYTES, &offset)) {
2606 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2609 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2610 parse->priv->last_offset - 1024);
2611 offset = MAX (0, offset);
2613 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2615 parse->priv->offset = offset;
2617 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2619 if (ret != GST_FLOW_OK)
2622 /* offset will increase again as fragment is processed/parsed */
2623 parse->priv->last_offset = offset;
2625 gst_adapter_push (parse->priv->adapter, buffer);
2626 ret = gst_base_parse_process_fragment (parse, FALSE);
2627 if (ret != GST_FLOW_OK)
2630 /* force previous fragment */
2631 parse->priv->offset = -1;
2638 * pull and scan for next frame starting from current offset
2639 * ajusts sync, drain and offset going along */
2640 static GstFlowReturn
2641 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2642 GstBaseParseFrame * frame, gboolean full)
2644 GstBuffer *buffer, *outbuf;
2645 GstFlowReturn ret = GST_FLOW_OK;
2646 guint fsize = 1, min_size, old_min_size = 0;
2649 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2651 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2652 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2654 /* let's make this efficient for all subclass once and for all;
2655 * maybe it does not need this much, but in the latter case, we know we are
2656 * in pull mode here and might as well try to read and supply more anyway
2657 * (so does the buffer caching mechanism) */
2663 min_size = MAX (parse->priv->min_frame_size, fsize);
2664 /* loop safety check */
2665 if (G_UNLIKELY (old_min_size >= min_size))
2667 old_min_size = min_size;
2669 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2670 if (ret != GST_FLOW_OK)
2673 if (parse->priv->discont) {
2674 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2675 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
2678 /* if we got a short read, inform subclass we are draining leftover
2679 * and no more is to be expected */
2680 if (gst_buffer_get_size (buffer) < min_size)
2681 parse->priv->drain = TRUE;
2683 if (parse->priv->detecting) {
2684 ret = klass->detect (parse, buffer);
2685 if (ret == GST_FLOW_NOT_NEGOTIATED) {
2686 /* If draining we error out, otherwise request a buffer
2688 if (parse->priv->drain) {
2689 gst_buffer_unref (buffer);
2690 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
2691 return GST_FLOW_ERROR;
2694 gst_buffer_unref (buffer);
2697 } else if (ret != GST_FLOW_OK) {
2698 gst_buffer_unref (buffer);
2699 GST_ERROR_OBJECT (parse, "detect() returned %s",
2700 gst_flow_get_name (ret));
2704 /* Else handle this buffer normally */
2708 gst_base_parse_frame_update (parse, frame, buffer);
2709 res = klass->check_valid_frame (parse, frame, &fsize, &skip);
2710 gst_buffer_replace (&frame->buffer, NULL);
2712 parse->priv->drain = FALSE;
2713 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2716 parse->priv->drain = FALSE;
2720 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2721 if (full && parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2722 /* reverse playback, and no frames found yet, so we are skipping
2723 * the leading part of a fragment, which may form the tail of
2724 * fragment coming later, hopefully subclass skips efficiently ... */
2725 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, 0, skip);
2726 parse->priv->buffers_pending =
2727 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2730 parse->priv->offset += skip;
2731 if (!parse->priv->discont)
2732 parse->priv->sync_offset = parse->priv->offset;
2733 parse->priv->discont = TRUE;
2734 /* something changed at least; nullify loop check */
2735 if (fsize == G_MAXUINT)
2736 fsize = old_min_size + 64 * 1024;
2739 /* skip == 0 should imply subclass set min_size to need more data;
2740 * we check this shortly */
2741 GST_DEBUG_OBJECT (parse, "finding sync...");
2742 gst_buffer_unref (buffer);
2743 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2748 /* Does the subclass want to skip too? */
2750 parse->priv->offset += skip;
2754 if (fsize + skip <= gst_buffer_get_size (buffer)) {
2755 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, skip, fsize);
2756 GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer) + skip;
2757 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2758 gst_buffer_unref (buffer);
2760 gst_buffer_unref (buffer);
2761 ret = gst_base_parse_pull_range (parse, fsize, &outbuf);
2762 if (ret != GST_FLOW_OK)
2764 if (gst_buffer_get_size (outbuf) < fsize) {
2765 gst_buffer_unref (outbuf);
2770 parse->priv->offset += fsize;
2772 frame->buffer = outbuf;
2780 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2781 ("min_size evolution %d -> %d; breaking to avoid looping",
2782 old_min_size, min_size));
2783 return GST_FLOW_ERROR;
2787 /* Loop that is used in pull mode to retrieve data from upstream */
2789 gst_base_parse_loop (GstPad * pad)
2791 GstBaseParse *parse;
2792 GstBaseParseClass *klass;
2793 GstFlowReturn ret = GST_FLOW_OK;
2794 GstBaseParseFrame frame;
2796 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2797 klass = GST_BASE_PARSE_GET_CLASS (parse);
2799 /* reverse playback:
2800 * first fragment (closest to stop time) is handled normally below,
2801 * then we pull in fragments going backwards */
2802 if (parse->segment.rate < 0.0) {
2803 /* check if we jumped back to a previous fragment,
2804 * which is a post-first fragment */
2805 if (parse->priv->offset < 0) {
2806 ret = gst_base_parse_handle_previous_fragment (parse);
2811 gst_base_parse_frame_init (&frame);
2812 ret = gst_base_parse_scan_frame (parse, klass, &frame, TRUE);
2813 if (ret != GST_FLOW_OK)
2816 /* This always cleans up frame, even if error occurs */
2817 ret = gst_base_parse_handle_and_push_frame (parse, klass, &frame);
2819 /* eat expected eos signalling past segment in reverse playback */
2820 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
2821 parse->segment.position >= parse->segment.stop) {
2822 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2823 /* push what was accumulated during loop run */
2824 gst_base_parse_process_fragment (parse, TRUE);
2825 /* force previous fragment */
2826 parse->priv->offset = -1;
2831 if (ret == GST_FLOW_EOS)
2833 else if (ret != GST_FLOW_OK)
2836 gst_object_unref (parse);
2843 GST_DEBUG_OBJECT (parse, "eos");
2848 gboolean push_eos = FALSE;
2850 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2851 gst_flow_get_name (ret));
2852 gst_pad_pause_task (parse->sinkpad);
2854 if (ret == GST_FLOW_EOS) {
2855 /* handle end-of-stream/segment */
2856 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2859 if ((stop = parse->segment.stop) == -1)
2860 stop = parse->segment.duration;
2862 GST_DEBUG_OBJECT (parse, "sending segment_done");
2864 gst_element_post_message
2865 (GST_ELEMENT_CAST (parse),
2866 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2867 GST_FORMAT_TIME, stop));
2869 /* If we STILL have zero frames processed, fire an error */
2870 if (parse->priv->framecount == 0) {
2871 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2872 ("No valid frames found before end of stream"), (NULL));
2876 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
2877 /* for fatal errors we post an error message, wrong-state is
2878 * not fatal because it happens due to flushes and only means
2879 * that we should stop now. */
2880 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2881 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
2885 /* newsegment before eos */
2886 if (parse->priv->pending_segment) {
2887 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
2888 parse->priv->pending_segment = NULL;
2890 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
2892 gst_object_unref (parse);
2897 gst_base_parse_sink_activate (GstPad * sinkpad)
2899 GstBaseParse *parse;
2900 gboolean result = TRUE;
2904 parse = GST_BASE_PARSE (gst_pad_get_parent (sinkpad));
2906 GST_DEBUG_OBJECT (parse, "sink activate");
2908 query = gst_query_new_scheduling ();
2909 result = gst_pad_peer_query (sinkpad, query);
2911 gst_query_parse_scheduling (query, &pull_mode, NULL, NULL, NULL, NULL,
2916 gst_query_unref (query);
2919 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
2920 result = gst_pad_activate_pull (sinkpad, TRUE);
2922 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
2923 result = gst_pad_activate_push (sinkpad, TRUE);
2926 GST_DEBUG_OBJECT (parse, "sink activate return %d", result);
2927 gst_object_unref (parse);
2932 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
2934 GstBaseParseClass *klass;
2935 gboolean result = TRUE;
2937 GST_DEBUG_OBJECT (parse, "activate %d", active);
2939 klass = GST_BASE_PARSE_GET_CLASS (parse);
2942 if (parse->priv->pad_mode == GST_ACTIVATE_NONE && klass->start)
2943 result = klass->start (parse);
2945 /* If the subclass implements ::detect we want to
2946 * call it for the first buffers now */
2947 parse->priv->detecting = (klass->detect != NULL);
2949 /* We must make sure streaming has finished before resetting things
2950 * and calling the ::stop vfunc */
2951 GST_PAD_STREAM_LOCK (parse->sinkpad);
2952 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
2954 if (parse->priv->pad_mode != GST_ACTIVATE_NONE && klass->stop)
2955 result = klass->stop (parse);
2957 parse->priv->pad_mode = GST_ACTIVATE_NONE;
2959 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
2964 gst_base_parse_sink_activate_push (GstPad * pad, gboolean active)
2966 gboolean result = TRUE;
2967 GstBaseParse *parse;
2969 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2971 GST_DEBUG_OBJECT (parse, "sink activate push %d", active);
2973 result = gst_base_parse_activate (parse, active);
2976 parse->priv->pad_mode = active ? GST_ACTIVATE_PUSH : GST_ACTIVATE_NONE;
2978 GST_DEBUG_OBJECT (parse, "sink activate push return: %d", result);
2980 gst_object_unref (parse);
2985 gst_base_parse_sink_activate_pull (GstPad * sinkpad, gboolean active)
2987 gboolean result = FALSE;
2988 GstBaseParse *parse;
2990 parse = GST_BASE_PARSE (gst_pad_get_parent (sinkpad));
2992 GST_DEBUG_OBJECT (parse, "activate pull %d", active);
2994 result = gst_base_parse_activate (parse, active);
2998 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
3000 gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop,
3003 result &= gst_pad_stop_task (sinkpad);
3008 parse->priv->pad_mode = active ? GST_ACTIVATE_PULL : GST_ACTIVATE_NONE;
3010 GST_DEBUG_OBJECT (parse, "sink activate pull return: %d", result);
3012 gst_object_unref (parse);
3018 * gst_base_parse_set_duration:
3019 * @parse: #GstBaseParse.
3021 * @duration: duration value.
3022 * @interval: how often to update the duration estimate based on bitrate, or 0.
3024 * Sets the duration of the currently playing media. Subclass can use this
3025 * when it is able to determine duration and/or notices a change in the media
3026 * duration. Alternatively, if @interval is non-zero (default), then stream
3027 * duration is determined based on estimated bitrate, and updated every @interval
3033 gst_base_parse_set_duration (GstBaseParse * parse,
3034 GstFormat fmt, gint64 duration, gint interval)
3036 g_return_if_fail (parse != NULL);
3038 if (parse->priv->upstream_has_duration) {
3039 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3043 if (duration != parse->priv->duration) {
3046 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
3047 gst_element_post_message (GST_ELEMENT (parse), m);
3049 /* TODO: what about duration tag? */
3051 parse->priv->duration = duration;
3052 parse->priv->duration_fmt = fmt;
3053 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3054 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3055 if (interval != 0) {
3056 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3060 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3061 parse->priv->update_interval = interval;
3067 * gst_base_parse_set_average_bitrate:
3068 * @parse: #GstBaseParse.
3069 * @bitrate: average bitrate in bits/second
3071 * Optionally sets the average bitrate detected in media (if non-zero),
3072 * e.g. based on metadata, as it will be posted to the application.
3074 * By default, announced average bitrate is estimated. The average bitrate
3075 * is used to estimate the total duration of the stream and to estimate
3076 * a seek position, if there's no index and the format is syncable
3077 * (see gst_base_parse_set_syncable()).
3082 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3084 parse->priv->bitrate = bitrate;
3085 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3089 * gst_base_parse_set_min_frame_size:
3090 * @parse: #GstBaseParse.
3091 * @min_size: Minimum size of the data that this base class should give to
3094 * Subclass can use this function to tell the base class that it needs to
3095 * give at least #min_size buffers.
3100 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3102 g_return_if_fail (parse != NULL);
3104 parse->priv->min_frame_size = min_size;
3105 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3109 * gst_base_parse_set_frame_rate:
3110 * @parse: the #GstBaseParse to set
3111 * @fps_num: frames per second (numerator).
3112 * @fps_den: frames per second (denominator).
3113 * @lead_in: frames needed before a segment for subsequent decode
3114 * @lead_out: frames needed after a segment
3116 * If frames per second is configured, parser can take care of buffer duration
3117 * and timestamping. When performing segment clipping, or seeking to a specific
3118 * location, a corresponding decoder might need an initial @lead_in and a
3119 * following @lead_out number of frames to ensure the desired segment is
3120 * entirely filled upon decoding.
3125 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3126 guint fps_den, guint lead_in, guint lead_out)
3128 g_return_if_fail (parse != NULL);
3130 parse->priv->fps_num = fps_num;
3131 parse->priv->fps_den = fps_den;
3132 if (!fps_num || !fps_den) {
3133 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3135 fps_num = fps_den = 0;
3136 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3137 parse->priv->lead_in = parse->priv->lead_out = 0;
3138 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3140 parse->priv->frame_duration =
3141 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3142 parse->priv->lead_in = lead_in;
3143 parse->priv->lead_out = lead_out;
3144 parse->priv->lead_in_ts =
3145 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3146 parse->priv->lead_out_ts =
3147 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3148 /* aim for about 1.5s to estimate duration */
3149 if (parse->priv->update_interval < 0) {
3150 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3151 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3152 parse->priv->update_interval);
3155 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3156 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3157 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3158 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3159 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3160 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3164 * gst_base_parse_set_has_timing_info:
3165 * @parse: a #GstBaseParse
3166 * @has_timing: whether frames carry timing information
3168 * Set if frames carry timing information which the subclass can (generally)
3169 * parse and provide. In particular, intrinsic (rather than estimated) time
3170 * can be obtained following a seek.
3175 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3177 parse->priv->has_timing_info = has_timing;
3178 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3182 * gst_base_parse_set_syncable:
3183 * @parse: a #GstBaseParse
3184 * @syncable: set if frame starts can be identified
3186 * Set if frame starts can be identified. This is set by default and
3187 * determines whether seeking based on bitrate averages
3188 * is possible for a format/stream.
3193 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3195 parse->priv->syncable = syncable;
3196 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3200 * gst_base_parse_set_passthrough:
3201 * @parse: a #GstBaseParse
3202 * @passthrough: %TRUE if parser should run in passthrough mode
3204 * Set if the nature of the format or configuration does not allow (much)
3205 * parsing, and the parser should operate in passthrough mode (which only
3206 * applies when operating in push mode). That is, incoming buffers are
3207 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3208 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3209 * so subclass can perform as much or as little is appropriate for
3210 * passthrough semantics in @pre_push_frame.
3215 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3217 parse->priv->passthrough = passthrough;
3218 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3222 * gst_base_parse_set_latency:
3223 * @parse: a #GstBaseParse
3224 * @min_latency: minimum parse latency
3225 * @max_latency: maximum parse latency
3227 * Sets the minimum and maximum (which may likely be equal) latency introduced
3228 * by the parsing process. If there is such a latency, which depends on the
3229 * particular parsing of the format, it typically corresponds to 1 frame duration.
3234 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3235 GstClockTime max_latency)
3237 GST_OBJECT_LOCK (parse);
3238 parse->priv->min_latency = min_latency;
3239 parse->priv->max_latency = max_latency;
3240 GST_OBJECT_UNLOCK (parse);
3241 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3242 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3243 GST_TIME_ARGS (max_latency));
3247 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3248 GstClockTime * duration)
3250 gboolean res = FALSE;
3252 g_return_val_if_fail (duration != NULL, FALSE);
3254 *duration = GST_CLOCK_TIME_NONE;
3255 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3256 GST_LOG_OBJECT (parse, "using provided duration");
3257 *duration = parse->priv->duration;
3259 } else if (parse->priv->duration != -1) {
3260 GST_LOG_OBJECT (parse, "converting provided duration");
3261 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3262 parse->priv->duration, format, (gint64 *) duration);
3263 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3264 GST_LOG_OBJECT (parse, "using estimated duration");
3265 *duration = parse->priv->estimated_duration;
3269 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3270 GST_TIME_ARGS (*duration));
3274 static const GstQueryType *
3275 gst_base_parse_get_querytypes (GstPad * pad)
3277 static const GstQueryType list[] = {
3290 gst_base_parse_query (GstPad * pad, GstQuery * query)
3292 GstBaseParse *parse;
3293 gboolean res = FALSE;
3295 parse = GST_BASE_PARSE (GST_PAD_PARENT (pad));
3297 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3299 switch (GST_QUERY_TYPE (query)) {
3300 case GST_QUERY_POSITION:
3305 GST_DEBUG_OBJECT (parse, "position query");
3306 gst_query_parse_position (query, &format, NULL);
3308 /* try upstream first */
3309 res = gst_pad_query_default (pad, query);
3311 /* Fall back on interpreting segment */
3312 GST_OBJECT_LOCK (parse);
3313 if (format == GST_FORMAT_BYTES) {
3314 dest_value = parse->priv->offset;
3316 } else if (format == parse->segment.format &&
3317 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
3318 dest_value = gst_segment_to_stream_time (&parse->segment,
3319 parse->segment.format, parse->segment.position);
3322 GST_OBJECT_UNLOCK (parse);
3324 /* no precise result, upstream no idea either, then best estimate */
3325 /* priv->offset is updated in both PUSH/PULL modes */
3326 res = gst_base_parse_convert (parse,
3327 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3330 gst_query_set_position (query, format, dest_value);
3334 case GST_QUERY_DURATION:
3337 GstClockTime duration;
3339 GST_DEBUG_OBJECT (parse, "duration query");
3340 gst_query_parse_duration (query, &format, NULL);
3342 /* consult upstream */
3343 res = gst_pad_query_default (pad, query);
3345 /* otherwise best estimate from us */
3347 res = gst_base_parse_get_duration (parse, format, &duration);
3349 gst_query_set_duration (query, format, duration);
3353 case GST_QUERY_SEEKING:
3356 GstClockTime duration = GST_CLOCK_TIME_NONE;
3357 gboolean seekable = FALSE;
3359 GST_DEBUG_OBJECT (parse, "seeking query");
3360 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3362 /* consult upstream */
3363 res = gst_pad_query_default (pad, query);
3365 /* we may be able to help if in TIME */
3366 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3367 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3368 /* already OK if upstream takes care */
3369 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3371 if (!(res && seekable)) {
3372 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3373 || duration == -1) {
3374 /* seekable if we still have a chance to get duration later on */
3376 parse->priv->upstream_seekable && parse->priv->update_interval;
3378 seekable = parse->priv->upstream_seekable;
3379 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3382 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3388 case GST_QUERY_FORMATS:
3389 gst_query_set_formatsv (query, 3, fmtlist);
3392 case GST_QUERY_CONVERT:
3394 GstFormat src_format, dest_format;
3395 gint64 src_value, dest_value;
3397 gst_query_parse_convert (query, &src_format, &src_value,
3398 &dest_format, &dest_value);
3400 res = gst_base_parse_convert (parse, src_format, src_value,
3401 dest_format, &dest_value);
3403 gst_query_set_convert (query, src_format, src_value,
3404 dest_format, dest_value);
3408 case GST_QUERY_LATENCY:
3410 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3412 GstClockTime min_latency, max_latency;
3414 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3415 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3416 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3417 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3419 GST_OBJECT_LOCK (parse);
3420 /* add our latency */
3421 if (min_latency != -1)
3422 min_latency += parse->priv->min_latency;
3423 if (max_latency != -1)
3424 max_latency += parse->priv->max_latency;
3425 GST_OBJECT_UNLOCK (parse);
3427 gst_query_set_latency (query, live, min_latency, max_latency);
3432 res = gst_pad_query_default (pad, query);
3438 /* scans for a cluster start from @pos,
3439 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3440 static GstFlowReturn
3441 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3442 GstClockTime * time, GstClockTime * duration)
3444 GstBaseParseClass *klass;
3446 gboolean orig_drain, orig_discont;
3447 GstFlowReturn ret = GST_FLOW_OK;
3448 GstBuffer *buf = NULL;
3449 GstBaseParseFrame frame;
3451 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3452 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3453 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3455 klass = GST_BASE_PARSE_GET_CLASS (parse);
3457 *time = GST_CLOCK_TIME_NONE;
3458 *duration = GST_CLOCK_TIME_NONE;
3461 orig_offset = parse->priv->offset;
3462 orig_discont = parse->priv->discont;
3463 orig_drain = parse->priv->drain;
3465 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3466 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3468 gst_base_parse_frame_init (&frame);
3470 /* jump elsewhere and locate next frame */
3471 parse->priv->offset = *pos;
3472 ret = gst_base_parse_scan_frame (parse, klass, &frame, FALSE);
3473 if (ret != GST_FLOW_OK)
3477 GST_LOG_OBJECT (parse,
3478 "peek parsing frame at offset %" G_GUINT64_FORMAT
3479 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
3480 GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET (buf),
3481 gst_buffer_get_size (buf));
3483 /* get offset first, subclass parsing might dump other stuff in there */
3484 *pos = GST_BUFFER_OFFSET (buf);
3485 ret = klass->parse_frame (parse, &frame);
3488 /* but it should provide proper time */
3489 *time = GST_BUFFER_TIMESTAMP (buf);
3490 *duration = GST_BUFFER_DURATION (buf);
3492 gst_base_parse_frame_free (&frame);
3494 GST_LOG_OBJECT (parse,
3495 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3496 GST_TIME_ARGS (*time), *pos);
3500 parse->priv->offset = orig_offset;
3501 parse->priv->discont = orig_discont;
3502 parse->priv->drain = orig_drain;
3507 /* bisect and scan through file for frame starting before @time,
3508 * returns OK and @time/@offset if found, NONE and/or error otherwise
3509 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3510 static GstFlowReturn
3511 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3514 GstFlowReturn ret = GST_FLOW_OK;
3515 gint64 lpos, hpos, newpos;
3516 GstClockTime time, ltime, htime, newtime, dur;
3517 gboolean cont = TRUE;
3518 const GstClockTime tolerance = TARGET_DIFFERENCE;
3519 const guint chunk = 4 * 1024;
3521 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3522 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3524 /* TODO also make keyframe aware if useful some day */
3539 /* do not know at first */
3541 *_time = GST_CLOCK_TIME_NONE;
3543 /* need initial positions; start and end */
3544 lpos = parse->priv->first_frame_offset;
3545 ltime = parse->priv->first_frame_ts;
3546 htime = parse->priv->duration;
3547 hpos = parse->priv->upstream_size;
3549 /* check preconditions are satisfied;
3550 * start and end are needed, except for special case where we scan for
3551 * last frame to determine duration */
3552 if (parse->priv->pad_mode != GST_ACTIVATE_PULL || !hpos ||
3553 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3554 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3558 /* shortcut cases */
3561 } else if (time < ltime + tolerance) {
3565 } else if (time >= htime) {
3571 while (htime > ltime && cont) {
3572 GST_LOG_OBJECT (parse,
3573 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3574 GST_TIME_ARGS (ltime));
3575 GST_LOG_OBJECT (parse,
3576 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3577 GST_TIME_ARGS (htime));
3578 if (G_UNLIKELY (time == G_MAXINT64)) {
3580 } else if (G_LIKELY (hpos > lpos)) {
3582 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3585 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3587 /* we check this case once, but not forever, so break loop */
3592 newpos = CLAMP (newpos, lpos, hpos);
3593 GST_LOG_OBJECT (parse,
3594 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3595 GST_TIME_ARGS (time), newpos);
3597 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3598 if (ret == GST_FLOW_EOS) {
3599 /* heuristic HACK */
3600 hpos = MAX (lpos, hpos - chunk);
3602 } else if (ret != GST_FLOW_OK) {
3606 if (newtime == -1 || newpos == -1) {
3607 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3611 if (G_UNLIKELY (time == G_MAXINT64)) {
3614 if (GST_CLOCK_TIME_IS_VALID (dur))
3617 } else if (newtime > time) {
3619 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3621 } else if (newtime + tolerance > time) {
3622 /* close enough undershoot */
3626 } else if (newtime < ltime) {
3627 /* so a position beyond lpos resulted in earlier time than ltime ... */
3628 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3631 /* undershoot too far */
3632 newpos += newpos == lpos ? chunk : 0;
3633 lpos = CLAMP (newpos, lpos, hpos);
3639 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3640 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3645 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3646 gboolean before, GstClockTime * _ts)
3648 gint64 bytes = 0, ts = 0;
3649 GstIndexEntry *entry = NULL;
3651 if (time == GST_CLOCK_TIME_NONE) {
3657 g_static_mutex_lock (&parse->priv->index_lock);
3658 if (parse->priv->index) {
3659 /* Let's check if we have an index entry for that time */
3660 entry = gst_index_get_assoc_entry (parse->priv->index,
3661 parse->priv->index_id,
3662 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3663 GST_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3667 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3668 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3670 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3671 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3672 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3674 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3675 GST_TIME_ARGS (time));
3678 ts = GST_CLOCK_TIME_NONE;
3681 g_static_mutex_unlock (&parse->priv->index_lock);
3690 /* returns TRUE if seek succeeded */
3692 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3697 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3698 gboolean flush, update, res = TRUE, accurate;
3699 gint64 cur, stop, seekpos, seekstop;
3700 GstSegment seeksegment = { 0, };
3701 GstClockTime start_ts;
3703 gst_event_parse_seek (event, &rate, &format, &flags,
3704 &cur_type, &cur, &stop_type, &stop);
3706 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3707 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3708 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3709 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3711 /* no negative rates in push mode */
3712 if (rate < 0.0 && parse->priv->pad_mode == GST_ACTIVATE_PUSH)
3715 if (cur_type != GST_SEEK_TYPE_SET ||
3716 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3719 /* For any format other than TIME, see if upstream handles
3720 * it directly or fail. For TIME, try upstream, but do it ourselves if
3721 * it fails upstream */
3722 if (format != GST_FORMAT_TIME) {
3723 /* default action delegates to upstream */
3727 gst_event_ref (event);
3728 if ((res = gst_pad_push_event (parse->sinkpad, event))) {
3733 /* get flush flag */
3734 flush = flags & GST_SEEK_FLAG_FLUSH;
3736 /* copy segment, we need this because we still need the old
3737 * segment when we close the current segment. */
3738 gst_segment_copy_into (&parse->segment, &seeksegment);
3740 GST_DEBUG_OBJECT (parse, "configuring seek");
3741 gst_segment_do_seek (&seeksegment, rate, format, flags,
3742 cur_type, cur, stop_type, stop, &update);
3744 /* accurate seeking implies seek tables are used to obtain position,
3745 * and the requested segment is maintained exactly, not adjusted any way */
3746 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3748 /* maybe we can be accurate for (almost) free */
3749 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
3750 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
3751 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3755 GstClockTime startpos = seeksegment.position;
3757 /* accurate requested, so ... seek a bit before target */
3758 if (startpos < parse->priv->lead_in_ts)
3761 startpos -= parse->priv->lead_in_ts;
3762 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3763 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3766 start_ts = seeksegment.position;
3767 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.position,
3768 GST_FORMAT_BYTES, &seekpos))
3769 goto convert_failed;
3770 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3771 GST_FORMAT_BYTES, &seekstop))
3772 goto convert_failed;
3775 GST_DEBUG_OBJECT (parse,
3776 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3778 GST_DEBUG_OBJECT (parse,
3779 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3780 seeksegment.stop, seekstop);
3782 if (parse->priv->pad_mode == GST_ACTIVATE_PULL) {
3785 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3788 if (parse->srcpad) {
3789 GST_DEBUG_OBJECT (parse, "sending flush start");
3790 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3791 /* unlock upstream pull_range */
3792 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3795 gst_pad_pause_task (parse->sinkpad);
3798 /* we should now be able to grab the streaming thread because we stopped it
3799 * with the above flush/pause code */
3800 GST_PAD_STREAM_LOCK (parse->sinkpad);
3802 /* save current position */
3803 last_stop = parse->segment.position;
3804 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3807 /* now commit to new position */
3809 /* prepare for streaming again */
3811 GST_DEBUG_OBJECT (parse, "sending flush stop");
3812 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop (TRUE));
3813 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop (TRUE));
3814 gst_base_parse_clear_queues (parse);
3816 /* keep track of our position */
3817 seeksegment.base = gst_segment_to_running_time (&seeksegment,
3818 seeksegment.format, parse->segment.position);
3821 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3823 /* store the newsegment event so it can be sent from the streaming thread. */
3824 if (parse->priv->pending_segment)
3825 gst_event_unref (parse->priv->pending_segment);
3827 /* This will be sent later in _loop() */
3828 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
3830 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3831 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3832 ", pos = %" GST_TIME_FORMAT, format,
3833 GST_TIME_ARGS (parse->segment.start),
3834 GST_TIME_ARGS (parse->segment.stop),
3835 GST_TIME_ARGS (parse->segment.start));
3837 /* one last chance in pull mode to stay accurate;
3838 * maybe scan and subclass can find where to go */
3841 GstClockTime ts = seeksegment.position;
3843 gst_base_parse_locate_time (parse, &ts, &scanpos);
3847 /* running collected index now consists of several intervals,
3848 * so optimized check no longer possible */
3849 parse->priv->index_last_valid = FALSE;
3850 parse->priv->index_last_offset = 0;
3851 parse->priv->index_last_ts = 0;
3855 /* mark discont if we are going to stream from another position. */
3856 if (seekpos != parse->priv->offset) {
3857 GST_DEBUG_OBJECT (parse,
3858 "mark DISCONT, we did a seek to another position");
3859 parse->priv->offset = seekpos;
3860 parse->priv->last_offset = seekpos;
3861 parse->priv->seen_keyframe = FALSE;
3862 parse->priv->discont = TRUE;
3863 parse->priv->next_ts = start_ts;
3864 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3865 parse->priv->sync_offset = seekpos;
3866 parse->priv->exact_position = accurate;
3869 /* Start streaming thread if paused */
3870 gst_pad_start_task (parse->sinkpad,
3871 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3873 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3878 GstEvent *new_event;
3879 GstBaseParseSeek *seek;
3880 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
3882 /* The only thing we need to do in PUSH-mode is to send the
3883 seek event (in bytes) to upstream. Segment / flush handling happens
3884 in corresponding src event handlers */
3885 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3886 if (seekstop >= 0 && seekstop <= seekpos)
3888 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
3889 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3891 /* store segment info so its precise details can be reconstructed when
3892 * receiving newsegment;
3893 * this matters for all details when accurate seeking,
3894 * is most useful to preserve NONE stop time otherwise */
3895 seek = g_new0 (GstBaseParseSeek, 1);
3896 seek->segment = seeksegment;
3897 seek->accurate = accurate;
3898 seek->offset = seekpos;
3899 seek->start_ts = start_ts;
3900 GST_OBJECT_LOCK (parse);
3901 /* less optimal, but preserves order */
3902 parse->priv->pending_seeks =
3903 g_slist_append (parse->priv->pending_seeks, seek);
3904 GST_OBJECT_UNLOCK (parse);
3906 res = gst_pad_push_event (parse->sinkpad, new_event);
3909 GST_OBJECT_LOCK (parse);
3910 parse->priv->pending_seeks =
3911 g_slist_remove (parse->priv->pending_seeks, seek);
3912 GST_OBJECT_UNLOCK (parse);
3918 /* handled event is ours to free */
3920 gst_event_unref (event);
3926 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
3932 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
3938 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
3944 /* Checks if bitrates are available from upstream tags so that we don't
3945 * override them later
3948 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
3950 GstTagList *taglist = NULL;
3953 gst_event_parse_tag (event, &taglist);
3955 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
3956 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
3957 parse->priv->post_min_bitrate = FALSE;
3959 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
3960 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
3961 parse->priv->post_avg_bitrate = FALSE;
3963 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
3964 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
3965 parse->priv->post_max_bitrate = FALSE;
3970 gst_base_parse_sink_getcaps (GstPad * pad, GstCaps * filter)
3972 GstBaseParse *parse;
3973 GstBaseParseClass *klass;
3976 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
3977 klass = GST_BASE_PARSE_GET_CLASS (parse);
3978 g_assert (pad == GST_BASE_PARSE_SINK_PAD (parse));
3980 if (klass->get_sink_caps)
3981 caps = klass->get_sink_caps (parse, filter);
3983 caps = gst_pad_proxy_getcaps (pad, filter);
3984 gst_object_unref (parse);
3986 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT, caps);
3993 gst_base_parse_set_index (GstElement * element, GstIndex * index)
3995 GstBaseParse *parse = GST_BASE_PARSE (element);
3997 g_static_mutex_lock (&parse->priv->index_lock);
3998 if (parse->priv->index)
3999 gst_object_unref (parse->priv->index);
4001 parse->priv->index = gst_object_ref (index);
4002 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4003 &parse->priv->index_id);
4004 parse->priv->own_index = FALSE;
4006 parse->priv->index = NULL;
4008 g_static_mutex_unlock (&parse->priv->index_lock);
4012 gst_base_parse_get_index (GstElement * element)
4014 GstBaseParse *parse = GST_BASE_PARSE (element);
4015 GstIndex *result = NULL;
4017 g_static_mutex_lock (&parse->priv->index_lock);
4018 if (parse->priv->index)
4019 result = gst_object_ref (parse->priv->index);
4020 g_static_mutex_unlock (&parse->priv->index_lock);
4025 static GstStateChangeReturn
4026 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4028 GstBaseParse *parse;
4029 GstStateChangeReturn result;
4031 parse = GST_BASE_PARSE (element);
4033 switch (transition) {
4034 case GST_STATE_CHANGE_READY_TO_PAUSED:
4035 /* If this is our own index destroy it as the
4036 * old entries might be wrong for the new stream */
4037 g_static_mutex_lock (&parse->priv->index_lock);
4038 if (parse->priv->own_index) {
4039 gst_object_unref (parse->priv->index);
4040 parse->priv->index = NULL;
4041 parse->priv->own_index = FALSE;
4044 /* If no index was created, generate one */
4045 if (G_UNLIKELY (!parse->priv->index)) {
4046 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4048 parse->priv->index = gst_index_factory_make ("memindex");
4049 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4050 &parse->priv->index_id);
4051 parse->priv->own_index = TRUE;
4053 g_static_mutex_unlock (&parse->priv->index_lock);
4059 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4061 switch (transition) {
4062 case GST_STATE_CHANGE_PAUSED_TO_READY:
4063 gst_base_parse_reset (parse);