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 calls @start to inform subclass that data processing is
57 * GstBaseParse class calls @set_sink_caps to inform the subclass about
58 * incoming sinkpad caps. Subclass could already set the srcpad caps
59 * accordingly, but this might be delayed until calling
60 * gst_base_parse_finish_frame() with a non-queued frame.
63 * At least at this point subclass needs to tell the GstBaseParse class
64 * how big data chunks it wants to receive (min_frame_size). It can do
65 * this with gst_base_parse_set_min_frame_size().
68 * GstBaseParse class sets up appropriate data passing mode (pull/push)
69 * and starts to process the data.
75 * <title>Parsing phase</title>
77 * GstBaseParse gathers at least min_frame_size bytes of data either
78 * by pulling it from upstream or collecting buffers in an internal
82 * A buffer of (at least) min_frame_size bytes is passed to subclass with
83 * @handle_frame. Subclass checks the contents and can optionally
84 * return GST_FLOW_OK along with an amount of data to be skipped to find
85 * a valid frame (which will result in a subsequent DISCONT).
86 * If, otherwise, the buffer does not hold a complete frame,
87 * @handle_frame can merely return and will be called again when additional
88 * data is available. In push mode this amounts to an
89 * additional input buffer (thus minimal additional latency), in pull mode
90 * this amounts to some arbitrary reasonable buffer size increase.
91 * Of course, gst_base_parse_set_min_size() could also be used if a very
92 * specific known amount of additional data is required.
93 * If, however, the buffer holds a complete valid frame, it can pass
94 * the size of this frame to gst_base_parse_finish_frame().
95 * If acting as a converter, it can also merely indicate consumed input data
96 * while simultaneously providing custom output data.
97 * Note that baseclass performs some processing (such as tracking
98 * overall consumed data rate versus duration) for each finished frame,
99 * but other state is only updated upon each call to @handle_frame
100 * (such as tracking upstream input timestamp).
102 * Subclass is also responsible for setting the buffer metadata
103 * (e.g. buffer timestamp and duration, or keyframe if applicable).
104 * (although the latter can also be done by GstBaseParse if it is
105 * appropriately configured, see below). Frame is provided with
106 * timestamp derived from upstream (as much as generally possible),
107 * duration obtained from configuration (see below), and offset
108 * if meaningful (in pull mode).
110 * Note that @check_valid_frame might receive any small
111 * amount of input data when leftover data is being drained (e.g. at EOS).
114 * As part of finish frame processing,
115 * just prior to actually pushing the buffer in question,
116 * it is passed to @pre_push_frame which gives subclass yet one
117 * last chance to examine buffer metadata, or to send some custom (tag)
118 * events, or to perform custom (segment) filtering.
121 * During the parsing process GstBaseParseClass will handle both srcpad
122 * and sinkpad events. They will be passed to subclass if @event or
123 * @src_event callbacks have been provided.
128 * <itemizedlist><title>Shutdown phase</title>
130 * GstBaseParse class calls @stop to inform the subclass that data
131 * parsing will be stopped.
137 * Subclass is responsible for providing pad template caps for
138 * source and sink pads. The pads need to be named "sink" and "src". It also
139 * needs to set the fixed caps on srcpad, when the format is ensured (e.g.
140 * when base class calls subclass' @set_sink_caps function).
142 * This base class uses #GST_FORMAT_DEFAULT as a meaning of frames. So,
143 * subclass conversion routine needs to know that conversion from
144 * #GST_FORMAT_TIME to #GST_FORMAT_DEFAULT must return the
145 * frame number that can be found from the given byte position.
147 * GstBaseParse uses subclasses conversion methods also for seeking (or
148 * otherwise uses its own default one, see also below).
150 * Subclass @start and @stop functions will be called to inform the beginning
151 * and end of data processing.
153 * Things that subclass need to take care of:
155 * <listitem><para>Provide pad templates</para></listitem>
157 * Fixate the source pad caps when appropriate
160 * Inform base class how big data chunks should be retrieved. This is
161 * done with gst_base_parse_set_min_frame_size() function.
164 * Examine data chunks passed to subclass with @handle_frame and pass
165 * proper frame(s) to gst_base_parse_finish_frame(), and setting src pad
166 * caps and timestamps on frame.
168 * <listitem><para>Provide conversion functions</para></listitem>
170 * Update the duration information with gst_base_parse_set_duration()
173 * Optionally passthrough using gst_base_parse_set_passthrough()
176 * Configure various baseparse parameters using
177 * gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
178 * and gst_base_parse_set_frame_rate().
181 * In particular, if subclass is unable to determine a duration, but
182 * parsing (or specs) yields a frames per seconds rate, then this can be
183 * provided to GstBaseParse to enable it to cater for
184 * buffer time metadata (which will be taken from upstream as much as
185 * possible). Internally keeping track of frame durations and respective
186 * sizes that have been pushed provides GstBaseParse with an estimated
187 * bitrate. A default @convert (used if not overriden) will then use these
188 * rates to perform obvious conversions. These rates are also used to
189 * update (estimated) duration at regular frame intervals.
196 * - In push mode provide a queue of adapter-"queued" buffers for upstream
198 * - Queue buffers/events until caps are set
208 #include <gst/base/gstadapter.h>
210 #include "gstbaseparse.h"
212 /* FIXME: get rid of old GstIndex code */
213 #include "gstindex.h"
214 #include "gstindex.c"
215 #include "gstmemindex.c"
217 #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
219 #define MIN_FRAMES_TO_POST_BITRATE 10
220 #define TARGET_DIFFERENCE (20 * GST_SECOND)
222 GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
223 #define GST_CAT_DEFAULT gst_base_parse_debug
225 /* Supported formats */
226 static const GstFormat fmtlist[] = {
233 #define GST_BASE_PARSE_GET_PRIVATE(obj) \
234 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
236 struct _GstBaseParsePrivate
243 GstFormat duration_fmt;
244 gint64 estimated_duration;
245 gint64 estimated_drift;
247 guint min_frame_size;
248 gboolean passthrough;
250 gboolean has_timing_info;
251 guint fps_num, fps_den;
252 gint update_interval;
254 guint lead_in, lead_out;
255 GstClockTime lead_in_ts, lead_out_ts;
256 GstClockTime min_latency, max_latency;
264 GstClockTime next_ts;
265 GstClockTime prev_ts;
266 GstClockTime frame_duration;
267 gboolean seen_keyframe;
273 guint64 data_bytecount;
274 guint64 acc_duration;
275 GstClockTime first_frame_ts;
276 gint64 first_frame_offset;
278 gboolean post_min_bitrate;
279 gboolean post_avg_bitrate;
280 gboolean post_max_bitrate;
284 guint posted_avg_bitrate;
286 GList *pending_events;
288 /* frames/buffers that are queued and ready to go on OK */
289 GQueue queued_frames;
293 /* index entry storage, either ours or provided */
299 /* seek table entries only maintained if upstream is BYTE seekable */
300 gboolean upstream_seekable;
301 gboolean upstream_has_duration;
302 gint64 upstream_size;
303 /* minimum distance between two index entries */
304 GstClockTimeDiff idx_interval;
305 /* ts and offset of last entry added */
306 GstClockTime index_last_ts;
307 gint64 index_last_offset;
308 gboolean index_last_valid;
310 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
311 gboolean exact_position;
312 /* seek events are temporarily kept to match them with newsegments */
313 GSList *pending_seeks;
315 /* reverse playback */
316 GSList *buffers_pending;
317 GSList *buffers_queued;
318 GSList *buffers_send;
319 GstClockTime last_ts;
322 /* Newsegment event to be sent after SEEK */
323 GstEvent *pending_segment;
325 /* frame previously passed to subclass (might be re-used) */
326 GstBaseParseFrame *prev_frame;
327 /* offset corresponding to above frame */
329 /* whether we are merely scanning for a frame */
331 /* ... and resulting frame, if any */
332 GstBaseParseFrame *scanned_frame;
334 /* TRUE if we're still detecting the format, i.e.
335 * if ::detect() is still called for future buffers */
337 GList *detect_buffers;
338 guint detect_buffers_size;
341 typedef struct _GstBaseParseSeek
346 GstClockTime start_ts;
349 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
350 g_mutex_lock (&parse->priv->index_lock);
351 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
352 g_mutex_unlock (&parse->priv->index_lock);
354 static GstElementClass *parent_class = NULL;
356 static void gst_base_parse_class_init (GstBaseParseClass * klass);
357 static void gst_base_parse_init (GstBaseParse * parse,
358 GstBaseParseClass * klass);
361 gst_base_parse_get_type (void)
363 static volatile gsize base_parse_type = 0;
365 if (g_once_init_enter (&base_parse_type)) {
366 static const GTypeInfo base_parse_info = {
367 sizeof (GstBaseParseClass),
368 (GBaseInitFunc) NULL,
369 (GBaseFinalizeFunc) NULL,
370 (GClassInitFunc) gst_base_parse_class_init,
373 sizeof (GstBaseParse),
375 (GInstanceInitFunc) gst_base_parse_init,
379 _type = g_type_register_static (GST_TYPE_ELEMENT,
380 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
381 g_once_init_leave (&base_parse_type, _type);
383 return (GType) base_parse_type;
386 static void gst_base_parse_finalize (GObject * object);
388 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
389 GstStateChange transition);
390 static void gst_base_parse_reset (GstBaseParse * parse);
393 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
394 static GstIndex *gst_base_parse_get_index (GstElement * element);
397 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
399 static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
400 GstObject * parent, GstPadMode mode, gboolean active);
401 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
403 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
405 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
407 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
410 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
412 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
415 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
417 static void gst_base_parse_loop (GstPad * pad);
419 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
420 GstBaseParseFrame * frame);
422 static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse,
425 static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse,
428 static void gst_base_parse_drain (GstBaseParse * parse);
430 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
431 gboolean post_min, gboolean post_avg, gboolean post_max);
433 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
434 GstClockTime time, gboolean before, GstClockTime * _ts);
435 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
436 GstClockTime * _time, gint64 * _offset);
438 static GstFlowReturn gst_base_parse_process_fragment (GstBaseParse * parse,
441 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
444 gst_base_parse_clear_queues (GstBaseParse * parse)
446 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
447 g_slist_free (parse->priv->buffers_queued);
448 parse->priv->buffers_queued = NULL;
449 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
451 g_slist_free (parse->priv->buffers_pending);
452 parse->priv->buffers_pending = NULL;
453 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
454 g_slist_free (parse->priv->buffers_send);
455 parse->priv->buffers_send = NULL;
457 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
458 g_list_free (parse->priv->detect_buffers);
459 parse->priv->detect_buffers = NULL;
460 parse->priv->detect_buffers_size = 0;
462 g_queue_foreach (&parse->priv->queued_frames,
463 (GFunc) gst_base_parse_frame_free, NULL);
464 g_queue_clear (&parse->priv->queued_frames);
468 gst_base_parse_finalize (GObject * object)
470 GstBaseParse *parse = GST_BASE_PARSE (object);
473 g_object_unref (parse->priv->adapter);
475 if (parse->priv->pending_segment) {
476 p_ev = &parse->priv->pending_segment;
477 gst_event_replace (p_ev, NULL);
480 if (parse->priv->cache) {
481 gst_buffer_unref (parse->priv->cache);
482 parse->priv->cache = NULL;
485 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
487 g_list_free (parse->priv->pending_events);
488 parse->priv->pending_events = NULL;
490 if (parse->priv->index) {
491 gst_object_unref (parse->priv->index);
492 parse->priv->index = NULL;
494 g_mutex_clear (&parse->priv->index_lock);
496 gst_base_parse_clear_queues (parse);
498 G_OBJECT_CLASS (parent_class)->finalize (object);
502 gst_base_parse_class_init (GstBaseParseClass * klass)
504 GObjectClass *gobject_class;
505 GstElementClass *gstelement_class;
507 gobject_class = G_OBJECT_CLASS (klass);
508 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
509 parent_class = g_type_class_peek_parent (klass);
510 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
512 gstelement_class = (GstElementClass *) klass;
513 gstelement_class->change_state =
514 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
517 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
518 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
521 /* Default handlers */
522 klass->src_event = gst_base_parse_src_eventfunc;
523 klass->convert = gst_base_parse_convert_default;
525 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
526 "baseparse element");
530 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
532 GstPadTemplate *pad_template;
534 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
536 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
539 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
540 g_return_if_fail (pad_template != NULL);
541 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
542 gst_pad_set_event_function (parse->sinkpad,
543 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
544 gst_pad_set_query_function (parse->sinkpad,
545 GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
546 gst_pad_set_chain_function (parse->sinkpad,
547 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
548 gst_pad_set_activate_function (parse->sinkpad,
549 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
550 gst_pad_set_activatemode_function (parse->sinkpad,
551 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
552 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
554 GST_DEBUG_OBJECT (parse, "sinkpad created");
557 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
558 g_return_if_fail (pad_template != NULL);
559 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
560 gst_pad_set_event_function (parse->srcpad,
561 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
562 gst_pad_set_query_function (parse->srcpad,
563 GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
564 gst_pad_use_fixed_caps (parse->srcpad);
565 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
566 GST_DEBUG_OBJECT (parse, "src created");
568 g_queue_init (&parse->priv->queued_frames);
570 parse->priv->adapter = gst_adapter_new ();
572 parse->priv->pad_mode = GST_PAD_MODE_NONE;
574 g_mutex_init (&parse->priv->index_lock);
577 gst_base_parse_reset (parse);
578 GST_DEBUG_OBJECT (parse, "init ok");
580 GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE);
583 static GstBaseParseFrame *
584 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
586 GstBaseParseFrame *copy;
588 copy = g_slice_dup (GstBaseParseFrame, frame);
589 copy->buffer = gst_buffer_ref (frame->buffer);
590 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
592 GST_TRACE ("copied frame %p -> %p", frame, copy);
598 gst_base_parse_frame_free (GstBaseParseFrame * frame)
600 GST_TRACE ("freeing frame %p", frame);
603 gst_buffer_unref (frame->buffer);
604 frame->buffer = NULL;
607 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
608 g_slice_free (GstBaseParseFrame, frame);
610 memset (frame, 0, sizeof (*frame));
614 G_DEFINE_BOXED_TYPE (GstBaseParseFrame, gst_base_parse_frame,
615 (GBoxedCopyFunc) gst_base_parse_frame_copy,
616 (GBoxedFreeFunc) gst_base_parse_frame_free);
619 * gst_base_parse_frame_init:
620 * @frame: #GstBaseParseFrame.
622 * Sets a #GstBaseParseFrame to initial state. Currently this means
623 * all public fields are zero-ed and a private flag is set to make
624 * sure gst_base_parse_frame_free() only frees the contents but not
625 * the actual frame. Use this function to initialise a #GstBaseParseFrame
626 * allocated on the stack.
631 gst_base_parse_frame_init (GstBaseParseFrame * frame)
633 memset (frame, 0, sizeof (GstBaseParseFrame));
634 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
635 GST_TRACE ("inited frame %p", frame);
639 * gst_base_parse_frame_new:
640 * @buffer: (transfer none): a #GstBuffer
642 * @overhead: number of bytes in this frame which should be counted as
643 * metadata overhead, ie. not used to calculate the average bitrate.
644 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
646 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
647 * elements written in C should usually allocate the frame on the stack and
648 * then use gst_base_parse_frame_init() to initialise it.
650 * Returns: a newly-allocated #GstBaseParseFrame. Free with
651 * gst_base_parse_frame_free() when no longer needed, unless you gave
652 * away ownership to gst_base_parse_push_frame().
657 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
660 GstBaseParseFrame *frame;
662 frame = g_slice_new0 (GstBaseParseFrame);
663 frame->buffer = gst_buffer_ref (buffer);
665 GST_TRACE ("created frame %p", frame);
670 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
673 gst_buffer_replace (&frame->buffer, buf);
677 /* set flags one by one for clarity */
678 if (G_UNLIKELY (parse->priv->drain))
679 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
681 /* losing sync is pretty much a discont (and vice versa), no ? */
682 if (G_UNLIKELY (parse->priv->discont))
683 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
687 gst_base_parse_reset (GstBaseParse * parse)
689 GST_OBJECT_LOCK (parse);
690 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
691 parse->priv->duration = -1;
692 parse->priv->min_frame_size = 1;
693 parse->priv->discont = TRUE;
694 parse->priv->flushing = FALSE;
695 parse->priv->offset = 0;
696 parse->priv->sync_offset = 0;
697 parse->priv->update_interval = -1;
698 parse->priv->fps_num = parse->priv->fps_den = 0;
699 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
700 parse->priv->lead_in = parse->priv->lead_out = 0;
701 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
702 parse->priv->bitrate = 0;
703 parse->priv->framecount = 0;
704 parse->priv->bytecount = 0;
705 parse->priv->acc_duration = 0;
706 parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE;
707 parse->priv->first_frame_offset = -1;
708 parse->priv->estimated_duration = -1;
709 parse->priv->estimated_drift = 0;
710 parse->priv->next_ts = 0;
711 parse->priv->syncable = TRUE;
712 parse->priv->passthrough = FALSE;
713 parse->priv->has_timing_info = FALSE;
714 parse->priv->post_min_bitrate = TRUE;
715 parse->priv->post_avg_bitrate = TRUE;
716 parse->priv->post_max_bitrate = TRUE;
717 parse->priv->min_bitrate = G_MAXUINT;
718 parse->priv->max_bitrate = 0;
719 parse->priv->avg_bitrate = 0;
720 parse->priv->posted_avg_bitrate = 0;
722 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
723 parse->priv->index_last_offset = -1;
724 parse->priv->index_last_valid = TRUE;
725 parse->priv->upstream_seekable = FALSE;
726 parse->priv->upstream_size = 0;
727 parse->priv->upstream_has_duration = FALSE;
728 parse->priv->idx_interval = 0;
729 parse->priv->exact_position = TRUE;
730 parse->priv->seen_keyframe = FALSE;
732 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
733 parse->priv->last_offset = 0;
735 if (parse->priv->pending_segment) {
736 gst_event_unref (parse->priv->pending_segment);
737 parse->priv->pending_segment = NULL;
740 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
742 g_list_free (parse->priv->pending_events);
743 parse->priv->pending_events = NULL;
745 if (parse->priv->cache) {
746 gst_buffer_unref (parse->priv->cache);
747 parse->priv->cache = NULL;
750 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
751 g_slist_free (parse->priv->pending_seeks);
752 parse->priv->pending_seeks = NULL;
754 if (parse->priv->adapter)
755 gst_adapter_clear (parse->priv->adapter);
757 /* we know it is not alloc'ed, but maybe other stuff to free, some day ... */
758 if (parse->priv->prev_frame) {
759 gst_base_parse_frame_free (parse->priv->prev_frame);
760 parse->priv->prev_frame = NULL;
763 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
764 g_list_free (parse->priv->detect_buffers);
765 parse->priv->detect_buffers = NULL;
766 parse->priv->detect_buffers_size = 0;
767 GST_OBJECT_UNLOCK (parse);
770 /* gst_base_parse_parse_frame:
771 * @parse: #GstBaseParse.
772 * @buffer: #GstBuffer.
774 * Default callback for parse_frame.
777 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
779 GstBuffer *buffer = frame->buffer;
781 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
782 GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) {
783 GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts;
785 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
786 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
787 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
792 /* gst_base_parse_convert:
793 * @parse: #GstBaseParse.
794 * @src_format: #GstFormat describing the source format.
795 * @src_value: Source value to be converted.
796 * @dest_format: #GstFormat defining the converted format.
797 * @dest_value: Pointer where the conversion result will be put.
799 * Converts using configured "convert" vmethod in #GstBaseParse class.
801 * Returns: TRUE if conversion was successful.
804 gst_base_parse_convert (GstBaseParse * parse,
805 GstFormat src_format,
806 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
808 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
811 g_return_val_if_fail (dest_value != NULL, FALSE);
816 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
818 #ifndef GST_DISABLE_GST_DEBUG
821 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
822 GST_LOG_OBJECT (parse,
823 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
824 GST_TIME_ARGS (src_value), *dest_value);
825 } else if (dest_format == GST_FORMAT_TIME &&
826 src_format == GST_FORMAT_BYTES) {
827 GST_LOG_OBJECT (parse,
828 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
829 src_value, GST_TIME_ARGS (*dest_value));
831 GST_LOG_OBJECT (parse,
832 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
833 GST_STR_NULL (gst_format_get_name (src_format)),
834 GST_STR_NULL (gst_format_get_name (dest_format)),
835 src_value, *dest_value);
838 GST_DEBUG_OBJECT (parse, "conversion failed");
846 /* gst_base_parse_sink_event:
847 * @pad: #GstPad that received the event.
848 * @event: #GstEvent to be handled.
850 * Handler for sink pad events.
852 * Returns: TRUE if the event was handled.
855 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
858 GstBaseParseClass *bclass;
859 gboolean handled = FALSE;
862 parse = GST_BASE_PARSE (parent);
863 bclass = GST_BASE_PARSE_GET_CLASS (parse);
865 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
866 GST_EVENT_TYPE_NAME (event));
868 /* Cache all events except EOS, SEGMENT and FLUSH_STOP if we have a
870 if (parse->priv->pending_segment && GST_EVENT_TYPE (event) != GST_EVENT_EOS
871 && GST_EVENT_TYPE (event) != GST_EVENT_SEGMENT
872 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
873 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP
874 && GST_EVENT_TYPE (event) != GST_EVENT_CAPS) {
876 if (GST_EVENT_TYPE (event) == GST_EVENT_TAG)
877 /* See if any bitrate tags were posted */
878 gst_base_parse_handle_tag (parse, event);
880 parse->priv->pending_events =
881 g_list_append (parse->priv->pending_events, event);
885 if (GST_EVENT_TYPE (event) == GST_EVENT_EOS &&
886 parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
887 /* We've not posted bitrate tags yet - do so now */
888 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
891 handled = bclass->event (parse, event);
894 handled = gst_base_parse_sink_eventfunc (parse, event);
897 ret = gst_pad_event_default (pad, parent, event);
900 GST_DEBUG_OBJECT (parse, "event handled");
906 /* gst_base_parse_sink_eventfunc:
907 * @parse: #GstBaseParse.
908 * @event: #GstEvent to be handled.
910 * Element-level event handler function.
912 * The event will be unreffed only if it has been handled and this
913 * function returns %TRUE
915 * Returns: %TRUE if the event was handled and not need forwarding.
918 gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event)
920 gboolean handled = FALSE;
923 switch (GST_EVENT_TYPE (event)) {
927 GstBaseParseClass *klass;
929 klass = GST_BASE_PARSE_GET_CLASS (parse);
931 gst_event_parse_caps (event, &caps);
932 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
934 if (klass->set_sink_caps)
935 klass->set_sink_caps (parse, caps);
937 /* will send our own caps downstream */
938 gst_event_unref (event);
942 case GST_EVENT_SEGMENT:
944 const GstSegment *in_segment;
945 GstSegment out_segment;
946 gint64 offset = 0, next_ts;
949 gdouble rate, applied_rate;
951 gint64 start, stop, pos, next_ts;
955 gst_event_parse_segment (event, &in_segment);
956 gst_segment_init (&out_segment, GST_FORMAT_TIME);
958 GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
960 if (in_segment->format == GST_FORMAT_BYTES) {
961 GstBaseParseSeek *seek = NULL;
964 /* stop time is allowed to be open-ended, but not start & pos */
965 offset = in_segment->time;
967 GST_OBJECT_LOCK (parse);
968 for (node = parse->priv->pending_seeks; node; node = node->next) {
969 GstBaseParseSeek *tmp = node->data;
971 if (tmp->offset == offset) {
976 parse->priv->pending_seeks =
977 g_slist_remove (parse->priv->pending_seeks, seek);
978 GST_OBJECT_UNLOCK (parse);
981 GST_DEBUG_OBJECT (parse,
982 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
983 seek->accurate ? " accurate" : "", &seek->segment);
985 out_segment.start = seek->segment.start;
986 out_segment.stop = seek->segment.stop;
987 out_segment.time = seek->segment.start;
989 next_ts = seek->start_ts;
990 parse->priv->exact_position = seek->accurate;
993 /* best attempt convert */
994 /* as these are only estimates, stop is kept open-ended to avoid
995 * premature cutting */
996 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
997 GST_FORMAT_TIME, (gint64 *) & next_ts);
999 out_segment.start = next_ts;
1000 out_segment.stop = GST_CLOCK_TIME_NONE;
1001 out_segment.time = next_ts;
1003 parse->priv->exact_position = (in_segment->start == 0);
1006 gst_event_unref (event);
1008 event = gst_event_new_segment (&out_segment);
1010 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1011 GST_SEGMENT_FORMAT, in_segment);
1013 } else if (in_segment->format != GST_FORMAT_TIME) {
1014 /* Unknown incoming segment format. Output a default open-ended
1016 gst_event_unref (event);
1018 out_segment.start = 0;
1019 out_segment.stop = GST_CLOCK_TIME_NONE;
1020 out_segment.time = 0;
1022 event = gst_event_new_segment (&out_segment);
1026 /* not considered BYTE seekable if it is talking to us in TIME,
1027 * whatever else it might claim */
1028 parse->priv->upstream_seekable = FALSE;
1029 next_ts = in_segment->start;
1032 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1035 gst_segment_set_newsegment (&parse->segment, update, rate,
1036 applied_rate, format, start, stop, start);
1039 /* save the segment for later, right before we push a new buffer so that
1040 * the caps are fixed and the next linked element can receive
1042 eventp = &parse->priv->pending_segment;
1043 gst_event_replace (eventp, event);
1044 gst_event_unref (event);
1047 /* but finish the current segment */
1048 GST_DEBUG_OBJECT (parse, "draining current segment");
1049 if (in_segment->rate > 0.0)
1050 gst_base_parse_drain (parse);
1052 gst_base_parse_process_fragment (parse, FALSE);
1053 gst_adapter_clear (parse->priv->adapter);
1055 parse->priv->offset = offset;
1056 parse->priv->sync_offset = offset;
1057 parse->priv->next_ts = next_ts;
1058 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1059 parse->priv->discont = TRUE;
1060 parse->priv->seen_keyframe = FALSE;
1064 case GST_EVENT_FLUSH_START:
1065 parse->priv->flushing = TRUE;
1066 handled = gst_pad_push_event (parse->srcpad, gst_event_ref (event));
1068 gst_event_unref (event);
1069 /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
1070 GST_PAD_STREAM_LOCK (parse->srcpad);
1071 GST_PAD_STREAM_UNLOCK (parse->srcpad);
1075 case GST_EVENT_FLUSH_STOP:
1076 gst_adapter_clear (parse->priv->adapter);
1077 gst_base_parse_clear_queues (parse);
1078 parse->priv->flushing = FALSE;
1079 parse->priv->discont = TRUE;
1080 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1081 if (parse->priv->prev_frame) {
1082 gst_base_parse_frame_free (parse->priv->prev_frame);
1083 parse->priv->prev_frame = NULL;
1088 if (parse->segment.rate > 0.0)
1089 gst_base_parse_drain (parse);
1091 gst_base_parse_process_fragment (parse, FALSE);
1093 /* If we STILL have zero frames processed, fire an error */
1094 if (parse->priv->framecount == 0) {
1095 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1096 ("No valid frames found before end of stream"), (NULL));
1098 /* newsegment before eos */
1099 if (parse->priv->pending_segment) {
1100 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
1101 parse->priv->pending_segment = NULL;
1113 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1115 GstBaseParse *parse;
1116 GstBaseParseClass *bclass;
1119 parse = GST_BASE_PARSE (parent);
1120 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1122 switch (GST_QUERY_TYPE (query)) {
1123 case GST_QUERY_CAPS:
1125 if (bclass->get_sink_caps) {
1126 GstCaps *caps, *filter;
1128 gst_query_parse_caps (query, &filter);
1129 caps = bclass->get_sink_caps (parse, filter);
1130 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1132 gst_query_set_caps_result (query, caps);
1133 gst_caps_unref (caps);
1137 GstCaps *caps, *template_caps, *filter;
1139 gst_query_parse_caps (query, &filter);
1140 template_caps = gst_pad_get_pad_template_caps (pad);
1141 if (filter != NULL) {
1143 gst_caps_intersect_full (filter, template_caps,
1144 GST_CAPS_INTERSECT_FIRST);
1145 gst_caps_unref (template_caps);
1147 caps = template_caps;
1149 gst_query_set_caps_result (query, caps);
1150 gst_caps_unref (caps);
1158 res = gst_pad_query_default (pad, parent, query);
1167 /* gst_base_parse_src_event:
1168 * @pad: #GstPad that received the event.
1169 * @event: #GstEvent that was received.
1171 * Handler for source pad events.
1173 * Returns: TRUE if the event was handled.
1176 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1178 GstBaseParse *parse;
1179 GstBaseParseClass *bclass;
1180 gboolean handled = FALSE;
1181 gboolean ret = TRUE;
1183 parse = GST_BASE_PARSE (parent);
1184 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1186 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1187 GST_EVENT_TYPE_NAME (event));
1189 if (bclass->src_event)
1190 handled = bclass->src_event (parse, event);
1193 ret = gst_pad_event_default (pad, parent, event);
1199 gst_base_parse_is_seekable (GstBaseParse * parse)
1201 /* FIXME: could do more here, e.g. check index or just send data from 0
1202 * in pull mode and let decoder/sink clip */
1203 return parse->priv->syncable;
1206 /* gst_base_parse_src_eventfunc:
1207 * @parse: #GstBaseParse.
1208 * @event: #GstEvent that was received.
1210 * Default srcpad event handler.
1212 * Returns: TRUE if the event was handled and can be dropped.
1215 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1217 gboolean handled = FALSE;
1219 switch (GST_EVENT_TYPE (event)) {
1220 case GST_EVENT_SEEK:
1222 if (gst_base_parse_is_seekable (parse)) {
1223 handled = gst_base_parse_handle_seek (parse, event);
1235 * gst_base_parse_convert_default:
1236 * @parse: #GstBaseParse.
1237 * @src_format: #GstFormat describing the source format.
1238 * @src_value: Source value to be converted.
1239 * @dest_format: #GstFormat defining the converted format.
1240 * @dest_value: Pointer where the conversion result will be put.
1242 * Default implementation of "convert" vmethod in #GstBaseParse class.
1244 * Returns: TRUE if conversion was successful.
1249 gst_base_parse_convert_default (GstBaseParse * parse,
1250 GstFormat src_format,
1251 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1253 gboolean ret = FALSE;
1254 guint64 bytes, duration;
1256 if (G_UNLIKELY (src_format == dest_format)) {
1257 *dest_value = src_value;
1261 if (G_UNLIKELY (src_value == -1)) {
1266 if (G_UNLIKELY (src_value == 0)) {
1271 /* need at least some frames */
1272 if (!parse->priv->framecount)
1275 duration = parse->priv->acc_duration / GST_MSECOND;
1276 bytes = parse->priv->bytecount;
1278 if (G_UNLIKELY (!duration || !bytes))
1281 if (src_format == GST_FORMAT_BYTES) {
1282 if (dest_format == GST_FORMAT_TIME) {
1283 /* BYTES -> TIME conversion */
1284 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1285 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1286 *dest_value *= GST_MSECOND;
1287 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1288 *dest_value / GST_MSECOND);
1291 } else if (src_format == GST_FORMAT_TIME) {
1292 if (dest_format == GST_FORMAT_BYTES) {
1293 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1294 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1296 GST_DEBUG_OBJECT (parse,
1297 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1298 src_value / GST_MSECOND, *dest_value);
1301 } else if (src_format == GST_FORMAT_DEFAULT) {
1302 /* DEFAULT == frame-based */
1303 if (dest_format == GST_FORMAT_TIME) {
1304 if (parse->priv->fps_den) {
1305 *dest_value = gst_util_uint64_scale (src_value,
1306 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1309 } else if (dest_format == GST_FORMAT_BYTES) {
1317 gst_base_parse_update_duration (GstBaseParse * baseparse)
1320 GstBaseParse *parse;
1322 parse = GST_BASE_PARSE (baseparse);
1324 peer = gst_pad_get_peer (parse->sinkpad);
1326 gboolean qres = FALSE;
1327 gint64 ptot, dest_value;
1329 qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot);
1330 gst_object_unref (GST_OBJECT (peer));
1332 if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1333 GST_FORMAT_TIME, &dest_value)) {
1335 /* inform if duration changed, but try to avoid spamming */
1336 parse->priv->estimated_drift +=
1337 dest_value - parse->priv->estimated_duration;
1338 if (parse->priv->estimated_drift > GST_SECOND ||
1339 parse->priv->estimated_drift < -GST_SECOND) {
1340 gst_element_post_message (GST_ELEMENT (parse),
1341 gst_message_new_duration (GST_OBJECT (parse),
1342 GST_FORMAT_TIME, dest_value));
1343 parse->priv->estimated_drift = 0;
1345 parse->priv->estimated_duration = dest_value;
1346 GST_LOG_OBJECT (parse,
1347 "updated estimated duration to %" GST_TIME_FORMAT,
1348 GST_TIME_ARGS (dest_value));
1355 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1356 gboolean post_avg, gboolean post_max)
1358 GstTagList *taglist = NULL;
1360 if (post_min && parse->priv->post_min_bitrate) {
1361 taglist = gst_tag_list_new_empty ();
1363 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1364 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1367 if (post_avg && parse->priv->post_avg_bitrate) {
1368 if (taglist == NULL)
1369 taglist = gst_tag_list_new_empty ();
1371 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1372 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1373 parse->priv->avg_bitrate, NULL);
1376 if (post_max && parse->priv->post_max_bitrate) {
1377 if (taglist == NULL)
1378 taglist = gst_tag_list_new_empty ();
1380 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1381 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1384 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1385 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1386 parse->priv->max_bitrate);
1388 if (taglist != NULL) {
1389 gst_pad_push_event (parse->srcpad, gst_event_new_tag (taglist));
1393 /* gst_base_parse_update_bitrates:
1394 * @parse: #GstBaseParse.
1395 * @buffer: Current frame as a #GstBuffer
1397 * Keeps track of the minimum and maximum bitrates, and also maintains a
1398 * running average bitrate of the stream so far.
1401 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1403 /* Only update the tag on a 10 kbps delta */
1404 static const gint update_threshold = 10000;
1406 guint64 data_len, frame_dur;
1407 gint overhead, frame_bitrate, old_avg_bitrate;
1408 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1409 GstBuffer *buffer = frame->buffer;
1411 overhead = frame->overhead;
1415 data_len = gst_buffer_get_size (buffer) - overhead;
1416 parse->priv->data_bytecount += data_len;
1418 /* duration should be valid by now,
1419 * either set by subclass or maybe based on fps settings */
1420 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1421 /* Calculate duration of a frame from buffer properties */
1422 frame_dur = GST_BUFFER_DURATION (buffer);
1423 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1424 parse->priv->acc_duration;
1427 /* No way to figure out frame duration (is this even possible?) */
1431 /* override if subclass provided bitrate, e.g. metadata based */
1432 if (parse->priv->bitrate) {
1433 parse->priv->avg_bitrate = parse->priv->bitrate;
1434 /* spread this (confirmed) info ASAP */
1435 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1436 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1440 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1444 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1445 parse->priv->avg_bitrate);
1447 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1449 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1450 /* always post all at threshold time */
1451 update_min = update_max = update_avg = TRUE;
1454 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1455 if (frame_bitrate < parse->priv->min_bitrate) {
1456 parse->priv->min_bitrate = frame_bitrate;
1460 if (frame_bitrate > parse->priv->max_bitrate) {
1461 parse->priv->max_bitrate = frame_bitrate;
1465 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1466 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1467 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1472 if ((update_min || update_avg || update_max))
1473 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1480 * gst_base_parse_add_index_entry:
1481 * @parse: #GstBaseParse.
1482 * @offset: offset of entry
1483 * @ts: timestamp associated with offset
1484 * @key: whether entry refers to keyframe
1485 * @force: add entry disregarding sanity checks
1487 * Adds an entry to the index associating @offset to @ts. It is recommended
1488 * to only add keyframe entries. @force allows to bypass checks, such as
1489 * whether the stream is (upstream) seekable, another entry is already "close"
1490 * to the new entry, etc.
1492 * Returns: #gboolean indicating whether entry was added
1497 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1498 GstClockTime ts, gboolean key, gboolean force)
1500 gboolean ret = FALSE;
1501 GstIndexAssociation associations[2];
1503 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1504 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1506 if (G_LIKELY (!force)) {
1508 if (!parse->priv->upstream_seekable) {
1509 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1513 /* FIXME need better helper data structure that handles these issues
1514 * related to ongoing collecting of index entries */
1515 if (parse->priv->index_last_offset >= (gint64) offset) {
1516 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1517 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1521 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1522 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1523 parse->priv->idx_interval) {
1524 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1525 GST_TIME_ARGS (parse->priv->index_last_ts));
1529 /* if last is not really the last one */
1530 if (!parse->priv->index_last_valid) {
1531 GstClockTime prev_ts;
1533 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1534 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1535 GST_DEBUG_OBJECT (parse,
1536 "entry too close to existing entry %" GST_TIME_FORMAT,
1537 GST_TIME_ARGS (prev_ts));
1538 parse->priv->index_last_offset = offset;
1539 parse->priv->index_last_ts = ts;
1545 associations[0].format = GST_FORMAT_TIME;
1546 associations[0].value = ts;
1547 associations[1].format = GST_FORMAT_BYTES;
1548 associations[1].value = offset;
1550 /* index might change on-the-fly, although that would be nutty app ... */
1551 GST_BASE_PARSE_INDEX_LOCK (parse);
1552 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1553 (key) ? GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT :
1554 GST_INDEX_ASSOCIATION_FLAG_DELTA_UNIT, 2,
1555 (const GstIndexAssociation *) &associations);
1556 GST_BASE_PARSE_INDEX_UNLOCK (parse);
1559 parse->priv->index_last_offset = offset;
1560 parse->priv->index_last_ts = ts;
1569 /* check for seekable upstream, above and beyond a mere query */
1571 gst_base_parse_check_seekability (GstBaseParse * parse)
1574 gboolean seekable = FALSE;
1575 gint64 start = -1, stop = -1;
1576 guint idx_interval = 0;
1578 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1579 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1580 GST_DEBUG_OBJECT (parse, "seeking query failed");
1584 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1586 /* try harder to query upstream size if we didn't get it the first time */
1587 if (seekable && stop == -1) {
1588 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1589 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1592 /* if upstream doesn't know the size, it's likely that it's not seekable in
1593 * practice even if it technically may be seekable */
1594 if (seekable && (start != 0 || stop <= start)) {
1595 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1599 /* let's not put every single frame into our index */
1601 if (stop < 10 * 1024 * 1024)
1603 else if (stop < 100 * 1024 * 1024)
1606 idx_interval = 1000;
1610 gst_query_unref (query);
1612 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1613 G_GUINT64_FORMAT ")", seekable, start, stop);
1614 parse->priv->upstream_seekable = seekable;
1615 parse->priv->upstream_size = seekable ? stop : 0;
1617 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1618 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1621 /* some misc checks on upstream */
1623 gst_base_parse_check_upstream (GstBaseParse * parse)
1627 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
1628 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1629 /* upstream has one, accept it also, and no further updates */
1630 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1631 parse->priv->upstream_has_duration = TRUE;
1634 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1635 parse->priv->upstream_has_duration);
1638 /* checks src caps to determine if dealing with audio or video */
1639 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1641 gst_base_parse_check_media (GstBaseParse * parse)
1646 caps = gst_pad_get_current_caps (parse->srcpad);
1647 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1648 parse->priv->is_video =
1649 g_str_has_prefix (gst_structure_get_name (s), "video");
1651 /* historical default */
1652 parse->priv->is_video = FALSE;
1655 gst_caps_unref (caps);
1657 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1660 /* takes ownership of frame */
1662 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1664 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1665 /* frame allocated on the heap, we can just take ownership */
1666 g_queue_push_tail (&parse->priv->queued_frames, frame);
1667 GST_TRACE ("queued frame %p", frame);
1669 GstBaseParseFrame *copy;
1671 /* probably allocated on the stack, must make a proper copy */
1672 copy = gst_base_parse_frame_copy (frame);
1673 g_queue_push_tail (&parse->priv->queued_frames, copy);
1674 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1675 gst_base_parse_frame_free (frame);
1679 /* makes sure that @buf is properly prepared and decorated for passing
1680 * to baseclass, and an equally setup frame is returned setup with @buf.
1681 * Takes ownership of @buf. */
1682 static GstBaseParseFrame *
1683 gst_base_parse_prepare_frame (GstBaseParse * parse, GstBuffer * buffer)
1685 GstBaseParseFrame *frame = NULL;
1687 buffer = gst_buffer_make_writable (buffer);
1689 GST_LOG_OBJECT (parse,
1690 "preparing frame at offset %" G_GUINT64_FORMAT
1691 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
1692 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1693 gst_buffer_get_size (buffer));
1695 if (parse->priv->discont) {
1696 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1697 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1698 parse->priv->discont = FALSE;
1701 GST_BUFFER_OFFSET (buffer) = parse->priv->offset;
1703 if (parse->priv->prev_frame) {
1704 if (parse->priv->prev_offset == parse->priv->offset) {
1705 frame = parse->priv->prev_frame;
1707 gst_base_parse_frame_free (parse->priv->prev_frame);
1709 parse->priv->prev_frame = NULL;
1713 frame = gst_base_parse_frame_new (buffer, 0, 0);
1716 /* also ensure to update state flags */
1717 gst_base_parse_frame_update (parse, frame, buffer);
1718 gst_buffer_unref (buffer);
1720 frame->offset = parse->priv->prev_offset = parse->priv->offset;
1722 /* use default handler to provide initial (upstream) metadata */
1723 gst_base_parse_parse_frame (parse, frame);
1729 gst_base_parse_unprepare_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1731 g_assert (parse->priv->prev_frame == NULL);
1733 parse->priv->prev_frame = frame;
1734 gst_base_parse_frame_update (parse, frame, NULL);
1737 /* takes ownership of @buffer */
1738 static GstFlowReturn
1739 gst_base_parse_handle_buffer (GstBaseParse * parse, GstBuffer * buffer,
1740 gint * skip, gint * flushed)
1742 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1743 GstBaseParseFrame *frame;
1746 g_return_val_if_fail (skip != NULL || flushed != NULL, GST_FLOW_ERROR);
1748 /* track what is being flushed during this single round of frame processing */
1749 parse->priv->flushed = 0;
1752 /* make it easy for _finish_frame to pick up input data */
1753 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1754 gst_buffer_ref (buffer);
1755 gst_adapter_push (parse->priv->adapter, buffer);
1758 frame = gst_base_parse_prepare_frame (parse, buffer);
1759 ret = klass->handle_frame (parse, frame, skip);
1760 gst_base_parse_unprepare_frame (parse, frame);
1762 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1763 gst_adapter_clear (parse->priv->adapter);
1766 *flushed = parse->priv->flushed;
1768 GST_LOG_OBJECT (parse, "handle_frame skipped %d, flushed %d",
1771 /* subclass can only do one of these, or semantics are too unclear */
1772 g_assert (*skip == 0 || *flushed == 0);
1774 /* if it did something, clear frame state,
1775 * though this should also trigger the offset check anyway */
1776 if (*skip != 0 || *flushed != 0) {
1777 GST_LOG_OBJECT (parse, "clearing prev frame");
1778 gst_base_parse_frame_free (parse->priv->prev_frame);
1779 parse->priv->prev_frame = NULL;
1782 parse->priv->offset += *flushed;
1784 #ifndef GST_DISABLE_GST_DEBUG
1785 if (ret != GST_FLOW_OK) {
1786 GST_DEBUG_OBJECT (parse, "handle_frame returned %d", ret);
1793 /* gst_base_parse_handle_and_push_buffer:
1794 * @parse: #GstBaseParse.
1795 * @klass: #GstBaseParseClass.
1796 * @frame: (transfer full): a #GstBaseParseFrame
1798 * Parses the frame from given buffer and pushes it forward. Also performs
1799 * timestamp handling and checks the segment limits.
1801 * This is called with srcpad STREAM_LOCK held.
1803 * Returns: #GstFlowReturn
1805 static GstFlowReturn
1806 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1807 GstBaseParseFrame * frame)
1812 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1814 /* some one-time start-up */
1815 if (G_UNLIKELY (!parse->priv->framecount)) {
1816 gst_base_parse_check_seekability (parse);
1817 gst_base_parse_check_upstream (parse);
1820 buffer = frame->buffer;
1821 offset = frame->offset;
1823 /* check if subclass/format can provide ts.
1824 * If so, that allows and enables extra seek and duration determining options */
1825 if (G_UNLIKELY (parse->priv->first_frame_offset < 0)) {
1826 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1827 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1828 parse->priv->first_frame_offset = offset;
1829 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1830 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1831 " for first frame at offset %" G_GINT64_FORMAT,
1832 GST_TIME_ARGS (parse->priv->first_frame_ts),
1833 parse->priv->first_frame_offset);
1834 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1836 GstClockTime last_ts = G_MAXINT64;
1838 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1839 gst_base_parse_locate_time (parse, &last_ts, &off);
1840 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1841 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1844 /* disable further checks */
1845 parse->priv->first_frame_offset = 0;
1849 /* again use default handler to add missing metadata;
1850 * we may have new information on frame properties */
1851 gst_base_parse_parse_frame (parse, frame);
1852 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1853 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1854 parse->priv->next_ts =
1855 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1857 /* we lost track, do not produce bogus time next time around
1858 * (probably means parser subclass has given up on parsing as well) */
1859 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1860 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1863 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1864 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1865 gst_base_parse_add_index_entry (parse, offset,
1866 GST_BUFFER_TIMESTAMP (buffer),
1867 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1869 /* All OK, push queued frames if there are any */
1870 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1871 GstBaseParseFrame *queued_frame;
1873 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1874 gst_base_parse_push_frame (parse, queued_frame);
1878 return gst_base_parse_push_frame (parse, frame);
1882 * gst_base_parse_push_frame:
1883 * @parse: #GstBaseParse.
1884 * @frame: (transfer none): a #GstBaseParseFrame
1886 * Pushes the frame's buffer downstream, sends any pending events and
1887 * does some timestamp and segment handling. Takes ownership of
1888 * frame's buffer, though caller retains ownership of @frame.
1890 * This must be called with sinkpad STREAM_LOCK held.
1892 * Returns: #GstFlowReturn
1897 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1899 GstFlowReturn ret = GST_FLOW_OK;
1900 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1901 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1902 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1906 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1907 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1909 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1911 buffer = frame->buffer;
1913 GST_LOG_OBJECT (parse,
1914 "processing buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT
1915 ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer),
1916 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1917 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1920 parse->priv->bytecount += frame->size;
1921 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1922 parse->priv->framecount++;
1923 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1924 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1927 /* 0 means disabled */
1928 if (parse->priv->update_interval < 0)
1929 parse->priv->update_interval = 50;
1930 else if (parse->priv->update_interval > 0 &&
1931 (parse->priv->framecount % parse->priv->update_interval) == 0)
1932 gst_base_parse_update_duration (parse);
1934 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1935 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1936 if (last_start != GST_CLOCK_TIME_NONE
1937 && GST_BUFFER_DURATION_IS_VALID (buffer))
1938 last_stop = last_start + GST_BUFFER_DURATION (buffer);
1940 /* should have caps by now */
1941 if (!gst_pad_has_current_caps (parse->srcpad))
1944 /* segment adjustment magic; only if we are running the whole show */
1945 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
1946 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
1947 parse->priv->upstream_seekable)) {
1948 /* segment times are typically estimates,
1949 * actual frame data might lead subclass to different timestamps,
1950 * so override segment start from what is supplied there */
1951 if (G_UNLIKELY (parse->priv->pending_segment && !parse->priv->exact_position
1952 && GST_CLOCK_TIME_IS_VALID (last_start))) {
1953 gst_event_unref (parse->priv->pending_segment);
1954 parse->segment.start =
1955 MIN ((guint64) last_start, (guint64) parse->segment.stop);
1957 GST_DEBUG_OBJECT (parse,
1958 "adjusting pending segment start to %" GST_TIME_FORMAT,
1959 GST_TIME_ARGS (parse->segment.start));
1961 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
1963 /* handle gaps, e.g. non-zero start-time, in as much not handled by above */
1964 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
1965 GST_CLOCK_TIME_IS_VALID (last_start)) {
1966 GstClockTimeDiff diff;
1968 /* only send newsegments with increasing start times,
1969 * otherwise if these go back and forth downstream (sinks) increase
1970 * accumulated time and running_time */
1971 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
1972 if (G_UNLIKELY (diff > 2 * GST_SECOND
1973 && last_start > parse->segment.start
1974 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
1975 || last_start < parse->segment.stop))) {
1977 GST_DEBUG_OBJECT (parse,
1978 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
1979 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
1980 "Sending updated NEWSEGMENT events", diff,
1981 GST_TIME_ARGS (parse->segment.position),
1982 GST_TIME_ARGS (last_start));
1984 if (G_UNLIKELY (parse->priv->pending_segment)) {
1985 gst_event_unref (parse->priv->pending_segment);
1986 parse->segment.start = last_start;
1987 parse->segment.time = last_start;
1988 parse->priv->pending_segment =
1989 gst_event_new_segment (&parse->segment);
1991 /* skip gap FIXME */
1992 gst_pad_push_event (parse->srcpad,
1993 gst_event_new_segment (&parse->segment));
1995 parse->segment.position = last_start;
2000 if (G_UNLIKELY (parse->priv->pending_segment)) {
2001 GstEvent *pending_segment;
2003 pending_segment = parse->priv->pending_segment;
2004 parse->priv->pending_segment = NULL;
2006 GST_DEBUG_OBJECT (parse, "%s push pending segment",
2007 parse->priv->pad_mode == GST_PAD_MODE_PULL ? "loop" : "chain");
2008 gst_pad_push_event (parse->srcpad, pending_segment);
2010 /* have caps; check identity */
2011 gst_base_parse_check_media (parse);
2014 /* update bitrates and optionally post corresponding tags
2015 * (following newsegment) */
2016 gst_base_parse_update_bitrates (parse, frame);
2018 if (G_UNLIKELY (parse->priv->pending_events)) {
2021 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
2022 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
2024 g_list_free (parse->priv->pending_events);
2025 parse->priv->pending_events = NULL;
2028 if (klass->pre_push_frame) {
2029 ret = klass->pre_push_frame (parse, frame);
2031 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
2034 /* take final ownership of frame buffer */
2035 if (frame->out_buffer) {
2036 buffer = frame->out_buffer;
2037 frame->out_buffer = NULL;
2038 gst_buffer_replace (&frame->buffer, NULL);
2040 buffer = frame->buffer;
2041 frame->buffer = NULL;
2044 /* subclass must play nice */
2045 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2047 size = gst_buffer_get_size (buffer);
2049 parse->priv->seen_keyframe |= parse->priv->is_video &&
2050 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
2052 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
2053 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2054 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
2055 GST_BUFFER_TIMESTAMP (buffer) >
2056 parse->segment.stop + parse->priv->lead_out_ts) {
2057 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
2059 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2060 GST_BUFFER_DURATION_IS_VALID (buffer) &&
2061 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
2062 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
2063 parse->priv->lead_in_ts < parse->segment.start) {
2064 if (parse->priv->seen_keyframe) {
2065 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
2068 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
2069 ret = GST_BASE_PARSE_FLOW_DROPPED;
2076 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2077 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2078 gst_buffer_unref (buffer);
2080 } else if (ret == GST_FLOW_OK) {
2081 if (parse->segment.rate > 0.0) {
2082 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2084 ret = gst_pad_push (parse->srcpad, buffer);
2085 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2087 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2089 parse->priv->buffers_queued =
2090 g_slist_prepend (parse->priv->buffers_queued, buffer);
2094 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2095 size, gst_flow_get_name (ret));
2096 gst_buffer_unref (buffer);
2097 /* if we are not sufficiently in control, let upstream decide on EOS */
2098 if (ret == GST_FLOW_EOS &&
2099 (parse->priv->passthrough ||
2100 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2101 !parse->priv->upstream_seekable)))
2105 /* Update current running segment position */
2106 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
2107 parse->segment.position < last_stop)
2108 parse->segment.position = last_stop;
2115 GST_ELEMENT_ERROR (parse, STREAM, DECODE, ("No caps set"), (NULL));
2116 return GST_FLOW_ERROR;
2121 * gst_base_parse_finish_frame:
2122 * @parse: a #GstBaseParse
2123 * @frame: a #GstBaseParseFrame
2124 * @size: consumed input data represented by frame
2126 * Collects parsed data and pushes this downstream.
2127 * Source pad caps must be set when this is called.
2129 * If @frame's out_buffer is set, that will be used as subsequent frame data.
2130 * Otherwise, @size samples will be taken from the input and used for output,
2131 * and the output's metadata (timestamps etc) will be taken as (optionally)
2132 * set by the subclass on @frame's (input) buffer.
2134 * Note that the latter buffer is invalidated by this call, whereas the
2135 * caller retains ownership of @frame.
2137 * Returns: a #GstFlowReturn that should be escalated to caller (of caller)
2142 gst_base_parse_finish_frame (GstBaseParse * parse, GstBaseParseFrame * frame,
2145 GstFlowReturn ret = GST_FLOW_OK;
2147 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2148 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
2149 g_return_val_if_fail (size > 0 || frame->out_buffer, GST_FLOW_ERROR);
2150 g_return_val_if_fail (gst_adapter_available (parse->priv->adapter) >= size,
2153 GST_LOG_OBJECT (parse, "finished frame at offset %" G_GUINT64_FORMAT ", "
2154 "flushing size %d", frame->offset, size);
2156 if (parse->priv->scanning && frame->buffer) {
2157 if (!parse->priv->scanned_frame) {
2158 parse->priv->scanned_frame = gst_base_parse_frame_copy (frame);
2163 parse->priv->flushed += size;
2165 /* either PUSH or PULL mode arranges for adapter data */
2166 /* ensure output buffer */
2167 if (!frame->out_buffer) {
2168 GstBuffer *src, *dest;
2170 frame->out_buffer = gst_adapter_take_buffer (parse->priv->adapter, size);
2171 dest = frame->out_buffer;
2172 src = frame->buffer;
2173 GST_BUFFER_PTS (dest) = GST_BUFFER_PTS (src);
2174 GST_BUFFER_DTS (dest) = GST_BUFFER_DTS (src);
2175 GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src);
2176 GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src);
2177 GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src);
2178 GST_MINI_OBJECT_FLAGS (dest) = GST_MINI_OBJECT_FLAGS (src);
2180 gst_adapter_flush (parse->priv->adapter, size);
2183 /* use as input for subsequent processing */
2184 gst_buffer_replace (&frame->buffer, frame->out_buffer);
2185 gst_buffer_unref (frame->out_buffer);
2186 frame->out_buffer = NULL;
2188 /* subclass might queue frames/data internally if it needs more
2189 * frames to decide on the format, or might request us to queue here. */
2190 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_DROP) {
2191 gst_buffer_replace (&frame->buffer, NULL);
2193 } else if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_QUEUE) {
2194 GstBaseParseFrame *copy;
2196 copy = gst_base_parse_frame_copy (frame);
2197 copy->flags &= ~GST_BASE_PARSE_FRAME_FLAG_QUEUE;
2198 gst_base_parse_queue_frame (parse, copy);
2202 ret = gst_base_parse_handle_and_push_frame (parse, frame);
2208 /* gst_base_parse_drain:
2210 * Drains the adapter until it is empty. It decreases the min_frame_size to
2211 * match the current adapter size and calls chain method until the adapter
2212 * is emptied or chain returns with error.
2215 gst_base_parse_drain (GstBaseParse * parse)
2219 GST_DEBUG_OBJECT (parse, "draining");
2220 parse->priv->drain = TRUE;
2223 avail = gst_adapter_available (parse->priv->adapter);
2227 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2228 NULL) != GST_FLOW_OK) {
2232 /* nothing changed, maybe due to truncated frame; break infinite loop */
2233 if (avail == gst_adapter_available (parse->priv->adapter)) {
2234 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2235 gst_adapter_clear (parse->priv->adapter);
2239 parse->priv->drain = FALSE;
2242 /* gst_base_parse_send_buffers
2244 * Sends buffers collected in send_buffers downstream, and ensures that list
2245 * is empty at the end (errors or not).
2247 static GstFlowReturn
2248 gst_base_parse_send_buffers (GstBaseParse * parse)
2250 GSList *send = NULL;
2252 GstFlowReturn ret = GST_FLOW_OK;
2254 send = parse->priv->buffers_send;
2258 buf = GST_BUFFER_CAST (send->data);
2259 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
2260 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2261 ", offset %" G_GINT64_FORMAT, buf,
2262 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
2263 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2265 /* iterate output queue an push downstream */
2266 ret = gst_pad_push (parse->srcpad, buf);
2267 send = g_slist_delete_link (send, send);
2269 /* clear any leftover if error */
2270 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2272 buf = GST_BUFFER_CAST (send->data);
2273 gst_buffer_unref (buf);
2274 send = g_slist_delete_link (send, send);
2279 parse->priv->buffers_send = send;
2284 /* gst_base_parse_process_fragment:
2286 * Processes a reverse playback (forward) fragment:
2287 * - append head of last fragment that was skipped to current fragment data
2288 * - drain the resulting current fragment data (i.e. repeated chain)
2289 * - add time/duration (if needed) to frames queued by chain
2290 * - push queued data
2292 static GstFlowReturn
2293 gst_base_parse_process_fragment (GstBaseParse * parse, gboolean push_only)
2296 GstFlowReturn ret = GST_FLOW_OK;
2297 gboolean seen_key = FALSE, seen_delta = FALSE;
2303 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2304 while (parse->priv->buffers_pending) {
2305 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2306 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2307 gst_buffer_get_size (buf));
2308 gst_adapter_push (parse->priv->adapter, buf);
2309 parse->priv->buffers_pending =
2310 g_slist_delete_link (parse->priv->buffers_pending,
2311 parse->priv->buffers_pending);
2314 /* invalidate so no fall-back timestamping is performed;
2315 * ok if taken from subclass or upstream */
2316 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2317 /* prevent it hanging around stop all the time */
2318 parse->segment.position = GST_CLOCK_TIME_NONE;
2320 parse->priv->discont = TRUE;
2322 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2323 /* initial skipped data is added to buffers_pending */
2324 gst_base_parse_drain (parse);
2327 if (parse->priv->buffers_send) {
2328 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2329 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2332 /* add metadata (if needed to queued buffers */
2333 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2334 GST_TIME_ARGS (parse->priv->last_ts));
2335 while (parse->priv->buffers_queued) {
2336 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2338 /* no touching if upstream or parsing provided time */
2339 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2340 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2341 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2342 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2343 GST_BUFFER_DURATION_IS_VALID (buf)) {
2344 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2345 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2347 parse->priv->last_ts = 0;
2348 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2349 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2350 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2352 /* no idea, very bad */
2353 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2356 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2358 /* reverse order for ascending sending */
2359 /* send downstream at keyframe not preceded by a keyframe
2360 * (e.g. that should identify start of collection of IDR nals) */
2361 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2363 ret = gst_base_parse_send_buffers (parse);
2364 /* if a problem, throw all to sending */
2365 if (ret != GST_FLOW_OK) {
2366 parse->priv->buffers_send =
2367 g_slist_reverse (parse->priv->buffers_queued);
2368 parse->priv->buffers_queued = NULL;
2378 parse->priv->buffers_send =
2379 g_slist_prepend (parse->priv->buffers_send, buf);
2380 parse->priv->buffers_queued =
2381 g_slist_delete_link (parse->priv->buffers_queued,
2382 parse->priv->buffers_queued);
2385 /* audio may have all marked as keyframe, so arrange to send here */
2387 ret = gst_base_parse_send_buffers (parse);
2389 /* any trailing unused no longer usable (ideally none) */
2390 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2391 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2392 gst_adapter_available (parse->priv->adapter));
2393 gst_adapter_clear (parse->priv->adapter);
2399 /* small helper that checks whether we have been trying to resync too long */
2400 static inline GstFlowReturn
2401 gst_base_parse_check_sync (GstBaseParse * parse)
2403 if (G_UNLIKELY (parse->priv->discont &&
2404 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2405 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2406 ("Failed to parse stream"), (NULL));
2407 return GST_FLOW_ERROR;
2413 static GstFlowReturn
2414 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
2416 GstBaseParseClass *bclass;
2417 GstBaseParse *parse;
2418 GstFlowReturn ret = GST_FLOW_OK;
2419 GstBuffer *outbuf = NULL;
2420 GstBuffer *tmpbuf = NULL;
2425 GstClockTime timestamp;
2427 parse = GST_BASE_PARSE (parent);
2428 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2430 if (parse->priv->detecting) {
2431 GstBuffer *detect_buf;
2433 if (parse->priv->detect_buffers_size == 0) {
2434 detect_buf = gst_buffer_ref (buffer);
2439 detect_buf = gst_buffer_new ();
2441 for (l = parse->priv->detect_buffers; l; l = l->next) {
2442 gsize tmpsize = gst_buffer_get_size (l->data);
2444 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
2445 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
2449 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
2450 offset, gst_buffer_get_size (buffer));
2453 ret = bclass->detect (parse, detect_buf);
2454 gst_buffer_unref (detect_buf);
2456 if (ret == GST_FLOW_OK) {
2459 /* Detected something */
2460 parse->priv->detecting = FALSE;
2462 for (l = parse->priv->detect_buffers; l; l = l->next) {
2463 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2465 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2466 parent, GST_BUFFER_CAST (l->data));
2468 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2470 g_list_free (parse->priv->detect_buffers);
2471 parse->priv->detect_buffers = NULL;
2472 parse->priv->detect_buffers_size = 0;
2474 if (ret != GST_FLOW_OK) {
2478 /* Handle the current buffer */
2479 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2480 /* Still detecting, append buffer or error out if draining */
2482 if (parse->priv->drain) {
2483 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2484 return GST_FLOW_ERROR;
2485 } else if (parse->priv->flushing) {
2486 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2488 g_list_free (parse->priv->detect_buffers);
2489 parse->priv->detect_buffers = NULL;
2490 parse->priv->detect_buffers_size = 0;
2492 parse->priv->detect_buffers =
2493 g_list_append (parse->priv->detect_buffers, buffer);
2494 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
2498 /* Something went wrong, subclass responsible for error reporting */
2502 /* And now handle the current buffer if detection worked */
2505 if (G_LIKELY (buffer)) {
2506 GST_LOG_OBJECT (parse,
2507 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT,
2508 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer));
2509 if (G_UNLIKELY (parse->priv->passthrough)) {
2510 GstBaseParseFrame frame;
2512 gst_base_parse_frame_init (&frame);
2513 frame.buffer = gst_buffer_make_writable (buffer);
2514 ret = gst_base_parse_push_frame (parse, &frame);
2515 gst_base_parse_frame_free (&frame);
2518 /* upstream feeding us in reverse playback;
2519 * gather each fragment, then process it in single run */
2520 if (parse->segment.rate < 0.0) {
2521 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2522 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2523 ret = gst_base_parse_process_fragment (parse, FALSE);
2525 gst_adapter_push (parse->priv->adapter, buffer);
2528 gst_adapter_push (parse->priv->adapter, buffer);
2531 /* Parse and push as many frames as possible */
2532 /* Stop either when adapter is empty or we are flushing */
2533 while (!parse->priv->flushing) {
2536 /* Synchronization loop */
2538 /* note: if subclass indicates MAX fsize,
2539 * this will not likely be available anyway ... */
2540 min_size = MAX (parse->priv->min_frame_size, fsize);
2541 av = gst_adapter_available (parse->priv->adapter);
2543 if (G_UNLIKELY (parse->priv->drain)) {
2545 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2546 if (G_UNLIKELY (!min_size)) {
2551 /* Collect at least min_frame_size bytes */
2552 if (av < min_size) {
2553 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)",
2558 /* move along with upstream timestamp (if any),
2559 * but interpolate in between */
2560 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2561 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2562 (parse->priv->prev_ts != timestamp)) {
2563 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2566 /* always pass all available data */
2567 data = gst_adapter_map (parse->priv->adapter, av);
2568 /* arrange for actual data to be copied if subclass tries to,
2569 * since what is passed is tied to the adapter */
2570 tmpbuf = gst_buffer_new ();
2571 gst_buffer_take_memory (tmpbuf, -1,
2572 gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY |
2573 GST_MEMORY_FLAG_NO_SHARE, (gpointer) data, NULL, av, 0, av));
2575 /* keep the adapter mapped, so keep track of what has to be flushed */
2576 ret = gst_base_parse_handle_buffer (parse, tmpbuf, &skip, &flush);
2579 gst_adapter_unmap (parse->priv->adapter);
2580 if (ret != GST_FLOW_OK) {
2584 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2585 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2586 /* reverse playback, and no frames found yet, so we are skipping
2587 * the leading part of a fragment, which may form the tail of
2588 * fragment coming later, hopefully subclass skips efficiently ... */
2589 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2590 outbuf = gst_adapter_take_buffer (parse->priv->adapter, skip);
2591 outbuf = gst_buffer_make_writable (outbuf);
2592 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
2593 parse->priv->buffers_pending =
2594 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2597 gst_adapter_flush (parse->priv->adapter, skip);
2599 if (!parse->priv->discont)
2600 parse->priv->sync_offset = parse->priv->offset;
2601 parse->priv->offset += skip;
2602 parse->priv->discont = TRUE;
2603 } else if (!flush) {
2604 GST_LOG_OBJECT (parse, "nothing skipped and no frames finished, "
2605 "breaking to get more data");
2608 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2613 /* Grab lock to prevent a race with FLUSH_START handler */
2614 GST_PAD_STREAM_LOCK (parse->srcpad);
2616 /* FLUSH_START event causes the "flushing" flag to be set. In this
2617 * case we can leave the frame pushing loop */
2618 if (parse->priv->flushing) {
2619 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2625 GST_LOG_OBJECT (parse, "chain leaving");
2629 /* pull @size bytes at current offset,
2630 * i.e. at least try to and possibly return a shorter buffer if near the end */
2631 static GstFlowReturn
2632 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2633 GstBuffer ** buffer)
2635 GstFlowReturn ret = GST_FLOW_OK;
2637 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2639 /* Caching here actually makes much less difference than one would expect.
2640 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2641 if (parse->priv->cache) {
2642 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2643 gint cache_size = gst_buffer_get_size (parse->priv->cache);
2645 if (cache_offset <= parse->priv->offset &&
2646 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2647 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
2648 parse->priv->offset - cache_offset, size);
2649 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2652 /* not enough data in the cache, free cache and get a new one */
2653 gst_buffer_unref (parse->priv->cache);
2654 parse->priv->cache = NULL;
2657 /* refill the cache */
2659 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2660 64 * 1024), &parse->priv->cache);
2661 if (ret != GST_FLOW_OK) {
2662 parse->priv->cache = NULL;
2666 if (gst_buffer_get_size (parse->priv->cache) >= size) {
2668 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
2670 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2674 /* Not possible to get enough data, try a last time with
2675 * requesting exactly the size we need */
2676 gst_buffer_unref (parse->priv->cache);
2677 parse->priv->cache = NULL;
2679 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2680 &parse->priv->cache);
2682 if (ret != GST_FLOW_OK) {
2683 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2688 if (gst_buffer_get_size (parse->priv->cache) < size) {
2689 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2690 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
2691 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
2693 *buffer = parse->priv->cache;
2694 parse->priv->cache = NULL;
2700 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
2701 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2706 static GstFlowReturn
2707 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2710 GstClockTime ts = 0;
2714 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2715 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2716 parse->priv->last_offset);
2718 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2719 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2720 GST_TIME_ARGS (parse->segment.start));
2725 /* last fragment started at last_offset / last_ts;
2726 * seek back 10s capped at 1MB */
2727 if (parse->priv->last_ts >= 10 * GST_SECOND)
2728 ts = parse->priv->last_ts - 10 * GST_SECOND;
2729 /* if we are exact now, we will be more so going backwards */
2730 if (parse->priv->exact_position) {
2731 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2733 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2734 GST_FORMAT_BYTES, &offset)) {
2735 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2738 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2739 parse->priv->last_offset - 1024);
2740 offset = MAX (0, offset);
2742 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2744 parse->priv->offset = offset;
2746 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2748 if (ret != GST_FLOW_OK)
2751 /* offset will increase again as fragment is processed/parsed */
2752 parse->priv->last_offset = offset;
2754 gst_adapter_push (parse->priv->adapter, buffer);
2755 ret = gst_base_parse_process_fragment (parse, FALSE);
2756 if (ret != GST_FLOW_OK)
2759 /* force previous fragment */
2760 parse->priv->offset = -1;
2767 * pull and scan for next frame starting from current offset
2768 * ajusts sync, drain and offset going along */
2769 static GstFlowReturn
2770 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2773 GstBuffer *buffer, *outbuf;
2774 GstFlowReturn ret = GST_FLOW_OK;
2775 guint fsize, min_size;
2779 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2780 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2782 /* let's make this efficient for all subclass once and for all;
2783 * maybe it does not need this much, but in the latter case, we know we are
2784 * in pull mode here and might as well try to read and supply more anyway
2785 * (so does the buffer caching mechanism) */
2789 min_size = MAX (parse->priv->min_frame_size, fsize);
2791 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2792 if (ret != GST_FLOW_OK)
2795 /* if we got a short read, inform subclass we are draining leftover
2796 * and no more is to be expected */
2797 if (gst_buffer_get_size (buffer) < min_size)
2798 parse->priv->drain = TRUE;
2800 if (parse->priv->detecting) {
2801 ret = klass->detect (parse, buffer);
2802 if (ret == GST_FLOW_NOT_NEGOTIATED) {
2803 /* If draining we error out, otherwise request a buffer
2805 if (parse->priv->drain) {
2806 gst_buffer_unref (buffer);
2807 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
2808 return GST_FLOW_ERROR;
2811 gst_buffer_unref (buffer);
2814 } else if (ret != GST_FLOW_OK) {
2815 gst_buffer_unref (buffer);
2816 GST_ERROR_OBJECT (parse, "detect() returned %s",
2817 gst_flow_get_name (ret));
2821 /* Else handle this buffer normally */
2824 /* might need it later on */
2825 gst_buffer_ref (buffer);
2826 ret = gst_base_parse_handle_buffer (parse, buffer, &skip, &flushed);
2827 if (ret != GST_FLOW_OK)
2831 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2832 if (full && parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2833 /* reverse playback, and no frames found yet, so we are skipping
2834 * the leading part of a fragment, which may form the tail of
2835 * fragment coming later, hopefully subclass skips efficiently ... */
2836 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, 0, skip);
2837 parse->priv->buffers_pending =
2838 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2841 if (!parse->priv->discont)
2842 parse->priv->sync_offset = parse->priv->offset;
2843 parse->priv->offset += skip;
2844 parse->priv->discont = TRUE;
2846 /* default to reasonable increase */
2849 /* no longer needed */
2850 gst_buffer_unref (buffer);
2851 /* changed offset means something happened,
2852 * and we should bail out of this loop so as not to occupy
2853 * the task thread indefinitely */
2855 GST_LOG_OBJECT (parse, "frame finished, breaking loop");
2858 /* nothing flushed, no skip and draining, so nothing left to do */
2859 if (!skip && parse->priv->drain) {
2860 GST_LOG_OBJECT (parse, "no activity or result when draining; "
2861 "breaking loop and marking EOS");
2865 parse->priv->drain = FALSE;
2866 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2875 /* Loop that is used in pull mode to retrieve data from upstream */
2877 gst_base_parse_loop (GstPad * pad)
2879 GstBaseParse *parse;
2880 GstBaseParseClass *klass;
2881 GstFlowReturn ret = GST_FLOW_OK;
2883 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2884 klass = GST_BASE_PARSE_GET_CLASS (parse);
2886 /* reverse playback:
2887 * first fragment (closest to stop time) is handled normally below,
2888 * then we pull in fragments going backwards */
2889 if (parse->segment.rate < 0.0) {
2890 /* check if we jumped back to a previous fragment,
2891 * which is a post-first fragment */
2892 if (parse->priv->offset < 0) {
2893 ret = gst_base_parse_handle_previous_fragment (parse);
2898 ret = gst_base_parse_scan_frame (parse, klass, TRUE);
2899 if (ret != GST_FLOW_OK)
2902 /* eat expected eos signalling past segment in reverse playback */
2903 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
2904 parse->segment.position >= parse->segment.stop) {
2905 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2906 /* push what was accumulated during loop run */
2907 gst_base_parse_process_fragment (parse, TRUE);
2908 /* force previous fragment */
2909 parse->priv->offset = -1;
2914 if (ret == GST_FLOW_EOS)
2916 else if (ret != GST_FLOW_OK)
2919 gst_object_unref (parse);
2926 GST_DEBUG_OBJECT (parse, "eos");
2931 gboolean push_eos = FALSE;
2933 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2934 gst_flow_get_name (ret));
2935 gst_pad_pause_task (parse->sinkpad);
2937 if (ret == GST_FLOW_EOS) {
2938 /* handle end-of-stream/segment */
2939 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2942 if ((stop = parse->segment.stop) == -1)
2943 stop = parse->segment.duration;
2945 GST_DEBUG_OBJECT (parse, "sending segment_done");
2947 gst_element_post_message
2948 (GST_ELEMENT_CAST (parse),
2949 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2950 GST_FORMAT_TIME, stop));
2952 /* If we STILL have zero frames processed, fire an error */
2953 if (parse->priv->framecount == 0) {
2954 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2955 ("No valid frames found before end of stream"), (NULL));
2959 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
2960 /* for fatal errors we post an error message, wrong-state is
2961 * not fatal because it happens due to flushes and only means
2962 * that we should stop now. */
2963 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2964 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
2968 /* newsegment before eos */
2969 if (parse->priv->pending_segment) {
2970 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
2971 parse->priv->pending_segment = NULL;
2973 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
2975 gst_object_unref (parse);
2980 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
2982 GstBaseParse *parse;
2983 gboolean result = TRUE;
2987 parse = GST_BASE_PARSE (parent);
2989 GST_DEBUG_OBJECT (parse, "sink activate");
2991 query = gst_query_new_scheduling ();
2992 result = gst_pad_peer_query (sinkpad, query);
2994 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL);
2998 gst_query_unref (query);
3001 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
3002 result = gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE);
3004 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
3005 result = gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
3008 GST_DEBUG_OBJECT (parse, "sink activate return %d", result);
3013 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
3015 GstBaseParseClass *klass;
3016 gboolean result = TRUE;
3018 GST_DEBUG_OBJECT (parse, "activate %d", active);
3020 klass = GST_BASE_PARSE_GET_CLASS (parse);
3023 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
3024 result = klass->start (parse);
3026 /* If the subclass implements ::detect we want to
3027 * call it for the first buffers now */
3028 parse->priv->detecting = (klass->detect != NULL);
3030 /* We must make sure streaming has finished before resetting things
3031 * and calling the ::stop vfunc */
3032 GST_PAD_STREAM_LOCK (parse->sinkpad);
3033 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3035 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
3036 result = klass->stop (parse);
3038 parse->priv->pad_mode = GST_PAD_MODE_NONE;
3040 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
3045 gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
3046 GstPadMode mode, gboolean active)
3048 gboolean result = TRUE;
3049 GstBaseParse *parse;
3051 parse = GST_BASE_PARSE (parent);
3053 GST_DEBUG_OBJECT (parse, "sink activate mode %d, %d", mode, active);
3055 result = gst_base_parse_activate (parse, active);
3059 case GST_PAD_MODE_PULL:
3061 parse->priv->pending_segment =
3062 gst_event_new_segment (&parse->segment);
3064 gst_pad_start_task (pad, (GstTaskFunction) gst_base_parse_loop,
3067 result &= gst_pad_stop_task (pad);
3075 parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
3077 GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
3083 * gst_base_parse_set_duration:
3084 * @parse: #GstBaseParse.
3086 * @duration: duration value.
3087 * @interval: how often to update the duration estimate based on bitrate, or 0.
3089 * Sets the duration of the currently playing media. Subclass can use this
3090 * when it is able to determine duration and/or notices a change in the media
3091 * duration. Alternatively, if @interval is non-zero (default), then stream
3092 * duration is determined based on estimated bitrate, and updated every @interval
3098 gst_base_parse_set_duration (GstBaseParse * parse,
3099 GstFormat fmt, gint64 duration, gint interval)
3101 g_return_if_fail (parse != NULL);
3103 if (parse->priv->upstream_has_duration) {
3104 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3108 if (duration != parse->priv->duration) {
3111 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
3112 gst_element_post_message (GST_ELEMENT (parse), m);
3114 /* TODO: what about duration tag? */
3116 parse->priv->duration = duration;
3117 parse->priv->duration_fmt = fmt;
3118 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3119 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3120 if (interval != 0) {
3121 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3125 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3126 parse->priv->update_interval = interval;
3132 * gst_base_parse_set_average_bitrate:
3133 * @parse: #GstBaseParse.
3134 * @bitrate: average bitrate in bits/second
3136 * Optionally sets the average bitrate detected in media (if non-zero),
3137 * e.g. based on metadata, as it will be posted to the application.
3139 * By default, announced average bitrate is estimated. The average bitrate
3140 * is used to estimate the total duration of the stream and to estimate
3141 * a seek position, if there's no index and the format is syncable
3142 * (see gst_base_parse_set_syncable()).
3147 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3149 parse->priv->bitrate = bitrate;
3150 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3154 * gst_base_parse_set_min_frame_size:
3155 * @parse: #GstBaseParse.
3156 * @min_size: Minimum size of the data that this base class should give to
3159 * Subclass can use this function to tell the base class that it needs to
3160 * give at least #min_size buffers.
3165 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3167 g_return_if_fail (parse != NULL);
3169 parse->priv->min_frame_size = min_size;
3170 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3174 * gst_base_parse_set_frame_rate:
3175 * @parse: the #GstBaseParse to set
3176 * @fps_num: frames per second (numerator).
3177 * @fps_den: frames per second (denominator).
3178 * @lead_in: frames needed before a segment for subsequent decode
3179 * @lead_out: frames needed after a segment
3181 * If frames per second is configured, parser can take care of buffer duration
3182 * and timestamping. When performing segment clipping, or seeking to a specific
3183 * location, a corresponding decoder might need an initial @lead_in and a
3184 * following @lead_out number of frames to ensure the desired segment is
3185 * entirely filled upon decoding.
3190 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3191 guint fps_den, guint lead_in, guint lead_out)
3193 g_return_if_fail (parse != NULL);
3195 parse->priv->fps_num = fps_num;
3196 parse->priv->fps_den = fps_den;
3197 if (!fps_num || !fps_den) {
3198 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3200 fps_num = fps_den = 0;
3201 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3202 parse->priv->lead_in = parse->priv->lead_out = 0;
3203 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3205 parse->priv->frame_duration =
3206 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3207 parse->priv->lead_in = lead_in;
3208 parse->priv->lead_out = lead_out;
3209 parse->priv->lead_in_ts =
3210 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3211 parse->priv->lead_out_ts =
3212 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3213 /* aim for about 1.5s to estimate duration */
3214 if (parse->priv->update_interval < 0) {
3215 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3216 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3217 parse->priv->update_interval);
3220 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3221 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3222 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3223 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3224 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3225 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3229 * gst_base_parse_set_has_timing_info:
3230 * @parse: a #GstBaseParse
3231 * @has_timing: whether frames carry timing information
3233 * Set if frames carry timing information which the subclass can (generally)
3234 * parse and provide. In particular, intrinsic (rather than estimated) time
3235 * can be obtained following a seek.
3240 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3242 parse->priv->has_timing_info = has_timing;
3243 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3247 * gst_base_parse_set_syncable:
3248 * @parse: a #GstBaseParse
3249 * @syncable: set if frame starts can be identified
3251 * Set if frame starts can be identified. This is set by default and
3252 * determines whether seeking based on bitrate averages
3253 * is possible for a format/stream.
3258 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3260 parse->priv->syncable = syncable;
3261 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3265 * gst_base_parse_set_passthrough:
3266 * @parse: a #GstBaseParse
3267 * @passthrough: %TRUE if parser should run in passthrough mode
3269 * Set if the nature of the format or configuration does not allow (much)
3270 * parsing, and the parser should operate in passthrough mode (which only
3271 * applies when operating in push mode). That is, incoming buffers are
3272 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3273 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3274 * so subclass can perform as much or as little is appropriate for
3275 * passthrough semantics in @pre_push_frame.
3280 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3282 parse->priv->passthrough = passthrough;
3283 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3287 * gst_base_parse_set_latency:
3288 * @parse: a #GstBaseParse
3289 * @min_latency: minimum parse latency
3290 * @max_latency: maximum parse latency
3292 * Sets the minimum and maximum (which may likely be equal) latency introduced
3293 * by the parsing process. If there is such a latency, which depends on the
3294 * particular parsing of the format, it typically corresponds to 1 frame duration.
3299 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3300 GstClockTime max_latency)
3302 GST_OBJECT_LOCK (parse);
3303 parse->priv->min_latency = min_latency;
3304 parse->priv->max_latency = max_latency;
3305 GST_OBJECT_UNLOCK (parse);
3306 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3307 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3308 GST_TIME_ARGS (max_latency));
3312 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3313 GstClockTime * duration)
3315 gboolean res = FALSE;
3317 g_return_val_if_fail (duration != NULL, FALSE);
3319 *duration = GST_CLOCK_TIME_NONE;
3320 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3321 GST_LOG_OBJECT (parse, "using provided duration");
3322 *duration = parse->priv->duration;
3324 } else if (parse->priv->duration != -1) {
3325 GST_LOG_OBJECT (parse, "converting provided duration");
3326 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3327 parse->priv->duration, format, (gint64 *) duration);
3328 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3329 GST_LOG_OBJECT (parse, "using estimated duration");
3330 *duration = parse->priv->estimated_duration;
3334 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3335 GST_TIME_ARGS (*duration));
3340 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
3342 GstBaseParse *parse;
3343 gboolean res = FALSE;
3345 parse = GST_BASE_PARSE (parent);
3347 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3349 switch (GST_QUERY_TYPE (query)) {
3350 case GST_QUERY_POSITION:
3355 GST_DEBUG_OBJECT (parse, "position query");
3356 gst_query_parse_position (query, &format, NULL);
3358 /* try upstream first */
3359 res = gst_pad_query_default (pad, parent, query);
3361 /* Fall back on interpreting segment */
3362 GST_OBJECT_LOCK (parse);
3363 if (format == GST_FORMAT_BYTES) {
3364 dest_value = parse->priv->offset;
3366 } else if (format == parse->segment.format &&
3367 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
3368 dest_value = gst_segment_to_stream_time (&parse->segment,
3369 parse->segment.format, parse->segment.position);
3372 GST_OBJECT_UNLOCK (parse);
3374 /* no precise result, upstream no idea either, then best estimate */
3375 /* priv->offset is updated in both PUSH/PULL modes */
3376 res = gst_base_parse_convert (parse,
3377 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3380 gst_query_set_position (query, format, dest_value);
3384 case GST_QUERY_DURATION:
3387 GstClockTime duration;
3389 GST_DEBUG_OBJECT (parse, "duration query");
3390 gst_query_parse_duration (query, &format, NULL);
3392 /* consult upstream */
3393 res = gst_pad_query_default (pad, parent, query);
3395 /* otherwise best estimate from us */
3397 res = gst_base_parse_get_duration (parse, format, &duration);
3399 gst_query_set_duration (query, format, duration);
3403 case GST_QUERY_SEEKING:
3406 GstClockTime duration = GST_CLOCK_TIME_NONE;
3407 gboolean seekable = FALSE;
3409 GST_DEBUG_OBJECT (parse, "seeking query");
3410 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3412 /* consult upstream */
3413 res = gst_pad_query_default (pad, parent, query);
3415 /* we may be able to help if in TIME */
3416 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3417 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3418 /* already OK if upstream takes care */
3419 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3421 if (!(res && seekable)) {
3422 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3423 || duration == -1) {
3424 /* seekable if we still have a chance to get duration later on */
3426 parse->priv->upstream_seekable && parse->priv->update_interval;
3428 seekable = parse->priv->upstream_seekable;
3429 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3432 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3438 case GST_QUERY_FORMATS:
3439 gst_query_set_formatsv (query, 3, fmtlist);
3442 case GST_QUERY_CONVERT:
3444 GstFormat src_format, dest_format;
3445 gint64 src_value, dest_value;
3447 gst_query_parse_convert (query, &src_format, &src_value,
3448 &dest_format, &dest_value);
3450 res = gst_base_parse_convert (parse, src_format, src_value,
3451 dest_format, &dest_value);
3453 gst_query_set_convert (query, src_format, src_value,
3454 dest_format, dest_value);
3458 case GST_QUERY_LATENCY:
3460 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3462 GstClockTime min_latency, max_latency;
3464 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3465 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3466 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3467 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3469 GST_OBJECT_LOCK (parse);
3470 /* add our latency */
3471 if (min_latency != -1)
3472 min_latency += parse->priv->min_latency;
3473 if (max_latency != -1)
3474 max_latency += parse->priv->max_latency;
3475 GST_OBJECT_UNLOCK (parse);
3477 gst_query_set_latency (query, live, min_latency, max_latency);
3482 res = gst_pad_query_default (pad, parent, query);
3488 /* scans for a cluster start from @pos,
3489 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3490 static GstFlowReturn
3491 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3492 GstClockTime * time, GstClockTime * duration)
3494 GstBaseParseClass *klass;
3496 gboolean orig_drain, orig_discont;
3497 GstFlowReturn ret = GST_FLOW_OK;
3498 GstBuffer *buf = NULL;
3499 GstBaseParseFrame *sframe = NULL;
3501 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3502 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3503 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3505 klass = GST_BASE_PARSE_GET_CLASS (parse);
3507 *time = GST_CLOCK_TIME_NONE;
3508 *duration = GST_CLOCK_TIME_NONE;
3511 orig_offset = parse->priv->offset;
3512 orig_discont = parse->priv->discont;
3513 orig_drain = parse->priv->drain;
3515 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3516 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3518 /* jump elsewhere and locate next frame */
3519 parse->priv->offset = *pos;
3520 /* mark as scanning so frames don't get processed all the way */
3521 parse->priv->scanning = TRUE;
3522 ret = gst_base_parse_scan_frame (parse, klass, FALSE);
3523 parse->priv->scanning = FALSE;
3524 /* retrieve frame found during scan */
3525 sframe = parse->priv->scanned_frame;
3526 parse->priv->scanned_frame = NULL;
3528 if (ret != GST_FLOW_OK || !sframe)
3531 /* get offset first, subclass parsing might dump other stuff in there */
3532 *pos = sframe->offset;
3533 buf = sframe->buffer;
3536 /* but it should provide proper time */
3537 *time = GST_BUFFER_TIMESTAMP (buf);
3538 *duration = GST_BUFFER_DURATION (buf);
3540 GST_LOG_OBJECT (parse,
3541 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3542 GST_TIME_ARGS (*time), *pos);
3546 gst_base_parse_frame_free (sframe);
3549 parse->priv->offset = orig_offset;
3550 parse->priv->discont = orig_discont;
3551 parse->priv->drain = orig_drain;
3556 /* bisect and scan through file for frame starting before @time,
3557 * returns OK and @time/@offset if found, NONE and/or error otherwise
3558 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3559 static GstFlowReturn
3560 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3563 GstFlowReturn ret = GST_FLOW_OK;
3564 gint64 lpos, hpos, newpos;
3565 GstClockTime time, ltime, htime, newtime, dur;
3566 gboolean cont = TRUE;
3567 const GstClockTime tolerance = TARGET_DIFFERENCE;
3568 const guint chunk = 4 * 1024;
3570 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3571 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3573 GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
3574 GST_TIME_ARGS (*_time));
3576 /* TODO also make keyframe aware if useful some day */
3591 /* do not know at first */
3593 *_time = GST_CLOCK_TIME_NONE;
3595 /* need initial positions; start and end */
3596 lpos = parse->priv->first_frame_offset;
3597 ltime = parse->priv->first_frame_ts;
3598 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
3599 GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
3600 return GST_FLOW_ERROR;
3602 hpos = parse->priv->upstream_size;
3604 GST_DEBUG_OBJECT (parse,
3605 "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
3606 ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, htime,
3607 GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
3609 /* check preconditions are satisfied;
3610 * start and end are needed, except for special case where we scan for
3611 * last frame to determine duration */
3612 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
3613 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3614 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3618 /* shortcut cases */
3621 } else if (time < ltime + tolerance) {
3625 } else if (time >= htime) {
3631 while (htime > ltime && cont) {
3632 GST_LOG_OBJECT (parse,
3633 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3634 GST_TIME_ARGS (ltime));
3635 GST_LOG_OBJECT (parse,
3636 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3637 GST_TIME_ARGS (htime));
3638 if (G_UNLIKELY (time == G_MAXINT64)) {
3640 } else if (G_LIKELY (hpos > lpos)) {
3642 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3645 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3647 /* we check this case once, but not forever, so break loop */
3652 newpos = CLAMP (newpos, lpos, hpos);
3653 GST_LOG_OBJECT (parse,
3654 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3655 GST_TIME_ARGS (time), newpos);
3657 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3658 if (ret == GST_FLOW_EOS) {
3659 /* heuristic HACK */
3660 hpos = MAX (lpos, hpos - chunk);
3662 } else if (ret != GST_FLOW_OK) {
3666 if (newtime == -1 || newpos == -1) {
3667 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3671 if (G_UNLIKELY (time == G_MAXINT64)) {
3674 if (GST_CLOCK_TIME_IS_VALID (dur))
3677 } else if (newtime > time) {
3679 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3681 } else if (newtime + tolerance > time) {
3682 /* close enough undershoot */
3686 } else if (newtime < ltime) {
3687 /* so a position beyond lpos resulted in earlier time than ltime ... */
3688 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3691 /* undershoot too far */
3692 newpos += newpos == lpos ? chunk : 0;
3693 lpos = CLAMP (newpos, lpos, hpos);
3699 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3700 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3705 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3706 gboolean before, GstClockTime * _ts)
3708 gint64 bytes = 0, ts = 0;
3709 GstIndexEntry *entry = NULL;
3711 if (time == GST_CLOCK_TIME_NONE) {
3717 GST_BASE_PARSE_INDEX_LOCK (parse);
3718 if (parse->priv->index) {
3719 /* Let's check if we have an index entry for that time */
3720 entry = gst_index_get_assoc_entry (parse->priv->index,
3721 parse->priv->index_id,
3722 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3723 GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3727 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3728 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3730 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3731 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3732 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3734 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3735 GST_TIME_ARGS (time));
3738 ts = GST_CLOCK_TIME_NONE;
3741 GST_BASE_PARSE_INDEX_UNLOCK (parse);
3750 /* returns TRUE if seek succeeded */
3752 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3757 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3758 gboolean flush, update, res = TRUE, accurate;
3759 gint64 cur, stop, seekpos, seekstop;
3760 GstSegment seeksegment = { 0, };
3761 GstClockTime start_ts;
3763 gst_event_parse_seek (event, &rate, &format, &flags,
3764 &cur_type, &cur, &stop_type, &stop);
3766 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3767 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3768 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3769 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3771 /* no negative rates in push mode */
3772 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
3775 if (cur_type != GST_SEEK_TYPE_SET ||
3776 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3779 /* For any format other than TIME, see if upstream handles
3780 * it directly or fail. For TIME, try upstream, but do it ourselves if
3781 * it fails upstream */
3782 if (format != GST_FORMAT_TIME) {
3783 /* default action delegates to upstream */
3787 gst_event_ref (event);
3788 if ((res = gst_pad_push_event (parse->sinkpad, event))) {
3793 /* get flush flag */
3794 flush = flags & GST_SEEK_FLAG_FLUSH;
3796 /* copy segment, we need this because we still need the old
3797 * segment when we close the current segment. */
3798 gst_segment_copy_into (&parse->segment, &seeksegment);
3800 GST_DEBUG_OBJECT (parse, "configuring seek");
3801 gst_segment_do_seek (&seeksegment, rate, format, flags,
3802 cur_type, cur, stop_type, stop, &update);
3804 /* accurate seeking implies seek tables are used to obtain position,
3805 * and the requested segment is maintained exactly, not adjusted any way */
3806 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3808 /* maybe we can be accurate for (almost) free */
3809 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
3810 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
3811 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3815 GstClockTime startpos = seeksegment.position;
3817 /* accurate requested, so ... seek a bit before target */
3818 if (startpos < parse->priv->lead_in_ts)
3821 startpos -= parse->priv->lead_in_ts;
3822 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3823 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3826 start_ts = seeksegment.position;
3827 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.position,
3828 GST_FORMAT_BYTES, &seekpos))
3829 goto convert_failed;
3830 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3831 GST_FORMAT_BYTES, &seekstop))
3832 goto convert_failed;
3835 GST_DEBUG_OBJECT (parse,
3836 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3838 GST_DEBUG_OBJECT (parse,
3839 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3840 seeksegment.stop, seekstop);
3842 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
3845 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3848 if (parse->srcpad) {
3849 GST_DEBUG_OBJECT (parse, "sending flush start");
3850 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3851 /* unlock upstream pull_range */
3852 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3855 gst_pad_pause_task (parse->sinkpad);
3858 /* we should now be able to grab the streaming thread because we stopped it
3859 * with the above flush/pause code */
3860 GST_PAD_STREAM_LOCK (parse->sinkpad);
3862 /* save current position */
3863 last_stop = parse->segment.position;
3864 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3867 /* now commit to new position */
3869 /* prepare for streaming again */
3871 GST_DEBUG_OBJECT (parse, "sending flush stop");
3872 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop (TRUE));
3873 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop (TRUE));
3874 gst_base_parse_clear_queues (parse);
3876 /* keep track of our position */
3877 seeksegment.base = gst_segment_to_running_time (&seeksegment,
3878 seeksegment.format, parse->segment.position);
3881 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3883 /* store the newsegment event so it can be sent from the streaming thread. */
3884 if (parse->priv->pending_segment)
3885 gst_event_unref (parse->priv->pending_segment);
3887 /* This will be sent later in _loop() */
3888 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
3890 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3891 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3892 ", pos = %" GST_TIME_FORMAT, format,
3893 GST_TIME_ARGS (parse->segment.start),
3894 GST_TIME_ARGS (parse->segment.stop),
3895 GST_TIME_ARGS (parse->segment.start));
3897 /* one last chance in pull mode to stay accurate;
3898 * maybe scan and subclass can find where to go */
3901 GstClockTime ts = seeksegment.position;
3903 gst_base_parse_locate_time (parse, &ts, &scanpos);
3907 /* running collected index now consists of several intervals,
3908 * so optimized check no longer possible */
3909 parse->priv->index_last_valid = FALSE;
3910 parse->priv->index_last_offset = 0;
3911 parse->priv->index_last_ts = 0;
3915 /* mark discont if we are going to stream from another position. */
3916 if (seekpos != parse->priv->offset) {
3917 GST_DEBUG_OBJECT (parse,
3918 "mark DISCONT, we did a seek to another position");
3919 parse->priv->offset = seekpos;
3920 parse->priv->last_offset = seekpos;
3921 parse->priv->seen_keyframe = FALSE;
3922 parse->priv->discont = TRUE;
3923 parse->priv->next_ts = start_ts;
3924 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3925 parse->priv->sync_offset = seekpos;
3926 parse->priv->exact_position = accurate;
3929 /* Start streaming thread if paused */
3930 gst_pad_start_task (parse->sinkpad,
3931 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3933 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3938 GstEvent *new_event;
3939 GstBaseParseSeek *seek;
3940 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
3942 /* The only thing we need to do in PUSH-mode is to send the
3943 seek event (in bytes) to upstream. Segment / flush handling happens
3944 in corresponding src event handlers */
3945 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3946 if (seekstop >= 0 && seekstop <= seekpos)
3948 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
3949 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3951 /* store segment info so its precise details can be reconstructed when
3952 * receiving newsegment;
3953 * this matters for all details when accurate seeking,
3954 * is most useful to preserve NONE stop time otherwise */
3955 seek = g_new0 (GstBaseParseSeek, 1);
3956 seek->segment = seeksegment;
3957 seek->accurate = accurate;
3958 seek->offset = seekpos;
3959 seek->start_ts = start_ts;
3960 GST_OBJECT_LOCK (parse);
3961 /* less optimal, but preserves order */
3962 parse->priv->pending_seeks =
3963 g_slist_append (parse->priv->pending_seeks, seek);
3964 GST_OBJECT_UNLOCK (parse);
3966 res = gst_pad_push_event (parse->sinkpad, new_event);
3969 GST_OBJECT_LOCK (parse);
3970 parse->priv->pending_seeks =
3971 g_slist_remove (parse->priv->pending_seeks, seek);
3972 GST_OBJECT_UNLOCK (parse);
3978 /* handled event is ours to free */
3980 gst_event_unref (event);
3986 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
3992 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
3998 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
4004 /* Checks if bitrates are available from upstream tags so that we don't
4005 * override them later
4008 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
4010 GstTagList *taglist = NULL;
4013 gst_event_parse_tag (event, &taglist);
4015 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
4016 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
4017 parse->priv->post_min_bitrate = FALSE;
4019 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
4020 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
4021 parse->priv->post_avg_bitrate = FALSE;
4023 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
4024 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
4025 parse->priv->post_max_bitrate = FALSE;
4031 gst_base_parse_set_index (GstElement * element, GstIndex * index)
4033 GstBaseParse *parse = GST_BASE_PARSE (element);
4035 GST_BASE_PARSE_INDEX_LOCK (parse);
4036 if (parse->priv->index)
4037 gst_object_unref (parse->priv->index);
4039 parse->priv->index = gst_object_ref (index);
4040 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4041 &parse->priv->index_id);
4042 parse->priv->own_index = FALSE;
4044 parse->priv->index = NULL;
4046 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4050 gst_base_parse_get_index (GstElement * element)
4052 GstBaseParse *parse = GST_BASE_PARSE (element);
4053 GstIndex *result = NULL;
4055 GST_BASE_PARSE_INDEX_LOCK (parse);
4056 if (parse->priv->index)
4057 result = gst_object_ref (parse->priv->index);
4058 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4064 static GstStateChangeReturn
4065 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4067 GstBaseParse *parse;
4068 GstStateChangeReturn result;
4070 parse = GST_BASE_PARSE (element);
4072 switch (transition) {
4073 case GST_STATE_CHANGE_READY_TO_PAUSED:
4074 /* If this is our own index destroy it as the
4075 * old entries might be wrong for the new stream */
4076 GST_BASE_PARSE_INDEX_LOCK (parse);
4077 if (parse->priv->own_index) {
4078 gst_object_unref (parse->priv->index);
4079 parse->priv->index = NULL;
4080 parse->priv->own_index = FALSE;
4083 /* If no index was created, generate one */
4084 if (G_UNLIKELY (!parse->priv->index)) {
4085 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4087 parse->priv->index = g_object_new (gst_mem_index_get_type (), NULL);
4088 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4089 &parse->priv->index_id);
4090 parse->priv->own_index = TRUE;
4092 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4098 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4100 switch (transition) {
4101 case GST_STATE_CHANGE_PAUSED_TO_READY:
4102 gst_base_parse_reset (parse);