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_head;
318 GSList *buffers_queued;
319 GSList *buffers_send;
320 GstClockTime last_ts;
323 /* Newsegment event to be sent after SEEK */
324 GstEvent *pending_segment;
326 /* offset of last parsed frame/data */
328 /* force a new frame, regardless of offset */
330 /* whether we are merely scanning for a frame */
332 /* ... and resulting frame, if any */
333 GstBaseParseFrame *scanned_frame;
335 /* TRUE if we're still detecting the format, i.e.
336 * if ::detect() is still called for future buffers */
338 GList *detect_buffers;
339 guint detect_buffers_size;
342 typedef struct _GstBaseParseSeek
347 GstClockTime start_ts;
350 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
351 g_mutex_lock (&parse->priv->index_lock);
352 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
353 g_mutex_unlock (&parse->priv->index_lock);
355 static GstElementClass *parent_class = NULL;
357 static void gst_base_parse_class_init (GstBaseParseClass * klass);
358 static void gst_base_parse_init (GstBaseParse * parse,
359 GstBaseParseClass * klass);
362 gst_base_parse_get_type (void)
364 static volatile gsize base_parse_type = 0;
366 if (g_once_init_enter (&base_parse_type)) {
367 static const GTypeInfo base_parse_info = {
368 sizeof (GstBaseParseClass),
369 (GBaseInitFunc) NULL,
370 (GBaseFinalizeFunc) NULL,
371 (GClassInitFunc) gst_base_parse_class_init,
374 sizeof (GstBaseParse),
376 (GInstanceInitFunc) gst_base_parse_init,
380 _type = g_type_register_static (GST_TYPE_ELEMENT,
381 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
382 g_once_init_leave (&base_parse_type, _type);
384 return (GType) base_parse_type;
387 static void gst_base_parse_finalize (GObject * object);
389 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
390 GstStateChange transition);
391 static void gst_base_parse_reset (GstBaseParse * parse);
394 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
395 static GstIndex *gst_base_parse_get_index (GstElement * element);
398 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
400 static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
401 GstObject * parent, GstPadMode mode, gboolean active);
402 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
404 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
406 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
408 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
411 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
413 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
416 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
418 static void gst_base_parse_loop (GstPad * pad);
420 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
421 GstBaseParseFrame * frame);
423 static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse,
426 static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse,
429 static void gst_base_parse_drain (GstBaseParse * parse);
431 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
432 gboolean post_min, gboolean post_avg, gboolean post_max);
434 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
435 GstClockTime time, gboolean before, GstClockTime * _ts);
436 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
437 GstClockTime * _time, gint64 * _offset);
439 static GstFlowReturn gst_base_parse_start_fragment (GstBaseParse * parse);
440 static GstFlowReturn gst_base_parse_finish_fragment (GstBaseParse * parse,
443 static inline GstFlowReturn gst_base_parse_check_sync (GstBaseParse * parse);
445 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
448 gst_base_parse_clear_queues (GstBaseParse * parse)
450 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
451 g_slist_free (parse->priv->buffers_queued);
452 parse->priv->buffers_queued = NULL;
453 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
455 g_slist_free (parse->priv->buffers_pending);
456 parse->priv->buffers_pending = NULL;
457 g_slist_foreach (parse->priv->buffers_head, (GFunc) gst_buffer_unref, NULL);
458 g_slist_free (parse->priv->buffers_head);
459 parse->priv->buffers_head = NULL;
460 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
461 g_slist_free (parse->priv->buffers_send);
462 parse->priv->buffers_send = NULL;
464 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
465 g_list_free (parse->priv->detect_buffers);
466 parse->priv->detect_buffers = NULL;
467 parse->priv->detect_buffers_size = 0;
469 g_queue_foreach (&parse->priv->queued_frames,
470 (GFunc) gst_base_parse_frame_free, NULL);
471 g_queue_clear (&parse->priv->queued_frames);
475 gst_base_parse_finalize (GObject * object)
477 GstBaseParse *parse = GST_BASE_PARSE (object);
480 g_object_unref (parse->priv->adapter);
482 if (parse->priv->pending_segment) {
483 p_ev = &parse->priv->pending_segment;
484 gst_event_replace (p_ev, NULL);
487 if (parse->priv->cache) {
488 gst_buffer_unref (parse->priv->cache);
489 parse->priv->cache = NULL;
492 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
494 g_list_free (parse->priv->pending_events);
495 parse->priv->pending_events = NULL;
497 if (parse->priv->index) {
498 gst_object_unref (parse->priv->index);
499 parse->priv->index = NULL;
501 g_mutex_clear (&parse->priv->index_lock);
503 gst_base_parse_clear_queues (parse);
505 G_OBJECT_CLASS (parent_class)->finalize (object);
509 gst_base_parse_class_init (GstBaseParseClass * klass)
511 GObjectClass *gobject_class;
512 GstElementClass *gstelement_class;
514 gobject_class = G_OBJECT_CLASS (klass);
515 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
516 parent_class = g_type_class_peek_parent (klass);
517 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
519 gstelement_class = (GstElementClass *) klass;
520 gstelement_class->change_state =
521 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
524 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
525 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
528 /* Default handlers */
529 klass->event = gst_base_parse_sink_eventfunc;
530 klass->src_event = gst_base_parse_src_eventfunc;
531 klass->convert = gst_base_parse_convert_default;
533 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
534 "baseparse element");
538 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
540 GstPadTemplate *pad_template;
542 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
544 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
547 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
548 g_return_if_fail (pad_template != NULL);
549 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
550 gst_pad_set_event_function (parse->sinkpad,
551 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
552 gst_pad_set_query_function (parse->sinkpad,
553 GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
554 gst_pad_set_chain_function (parse->sinkpad,
555 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
556 gst_pad_set_activate_function (parse->sinkpad,
557 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
558 gst_pad_set_activatemode_function (parse->sinkpad,
559 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
560 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
562 GST_DEBUG_OBJECT (parse, "sinkpad created");
565 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
566 g_return_if_fail (pad_template != NULL);
567 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
568 gst_pad_set_event_function (parse->srcpad,
569 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
570 gst_pad_set_query_function (parse->srcpad,
571 GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
572 gst_pad_use_fixed_caps (parse->srcpad);
573 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
574 GST_DEBUG_OBJECT (parse, "src created");
576 g_queue_init (&parse->priv->queued_frames);
578 parse->priv->adapter = gst_adapter_new ();
580 parse->priv->pad_mode = GST_PAD_MODE_NONE;
582 g_mutex_init (&parse->priv->index_lock);
585 gst_base_parse_reset (parse);
586 GST_DEBUG_OBJECT (parse, "init ok");
588 GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE);
591 static GstBaseParseFrame *
592 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
594 GstBaseParseFrame *copy;
596 copy = g_slice_dup (GstBaseParseFrame, frame);
597 copy->buffer = gst_buffer_ref (frame->buffer);
598 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
600 GST_TRACE ("copied frame %p -> %p", frame, copy);
606 gst_base_parse_frame_free (GstBaseParseFrame * frame)
608 GST_TRACE ("freeing frame %p", frame);
611 gst_buffer_unref (frame->buffer);
612 frame->buffer = NULL;
615 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
616 g_slice_free (GstBaseParseFrame, frame);
618 memset (frame, 0, sizeof (*frame));
622 G_DEFINE_BOXED_TYPE (GstBaseParseFrame, gst_base_parse_frame,
623 (GBoxedCopyFunc) gst_base_parse_frame_copy,
624 (GBoxedFreeFunc) gst_base_parse_frame_free);
627 * gst_base_parse_frame_init:
628 * @frame: #GstBaseParseFrame.
630 * Sets a #GstBaseParseFrame to initial state. Currently this means
631 * all public fields are zero-ed and a private flag is set to make
632 * sure gst_base_parse_frame_free() only frees the contents but not
633 * the actual frame. Use this function to initialise a #GstBaseParseFrame
634 * allocated on the stack.
639 gst_base_parse_frame_init (GstBaseParseFrame * frame)
641 memset (frame, 0, sizeof (GstBaseParseFrame));
642 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
643 GST_TRACE ("inited frame %p", frame);
647 * gst_base_parse_frame_new:
648 * @buffer: (transfer none): a #GstBuffer
650 * @overhead: number of bytes in this frame which should be counted as
651 * metadata overhead, ie. not used to calculate the average bitrate.
652 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
654 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
655 * elements written in C should usually allocate the frame on the stack and
656 * then use gst_base_parse_frame_init() to initialise it.
658 * Returns: a newly-allocated #GstBaseParseFrame. Free with
659 * gst_base_parse_frame_free() when no longer needed.
664 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
667 GstBaseParseFrame *frame;
669 frame = g_slice_new0 (GstBaseParseFrame);
670 frame->buffer = gst_buffer_ref (buffer);
672 GST_TRACE ("created frame %p", frame);
677 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
680 gst_buffer_replace (&frame->buffer, buf);
684 /* set flags one by one for clarity */
685 if (G_UNLIKELY (parse->priv->drain))
686 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
688 /* losing sync is pretty much a discont (and vice versa), no ? */
689 if (G_UNLIKELY (parse->priv->discont))
690 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
694 gst_base_parse_reset (GstBaseParse * parse)
696 GST_OBJECT_LOCK (parse);
697 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
698 parse->priv->duration = -1;
699 parse->priv->min_frame_size = 1;
700 parse->priv->discont = TRUE;
701 parse->priv->flushing = FALSE;
702 parse->priv->offset = 0;
703 parse->priv->sync_offset = 0;
704 parse->priv->update_interval = -1;
705 parse->priv->fps_num = parse->priv->fps_den = 0;
706 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
707 parse->priv->lead_in = parse->priv->lead_out = 0;
708 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
709 parse->priv->bitrate = 0;
710 parse->priv->framecount = 0;
711 parse->priv->bytecount = 0;
712 parse->priv->acc_duration = 0;
713 parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE;
714 parse->priv->first_frame_offset = -1;
715 parse->priv->estimated_duration = -1;
716 parse->priv->estimated_drift = 0;
717 parse->priv->next_ts = 0;
718 parse->priv->syncable = TRUE;
719 parse->priv->passthrough = FALSE;
720 parse->priv->has_timing_info = FALSE;
721 parse->priv->post_min_bitrate = TRUE;
722 parse->priv->post_avg_bitrate = TRUE;
723 parse->priv->post_max_bitrate = TRUE;
724 parse->priv->min_bitrate = G_MAXUINT;
725 parse->priv->max_bitrate = 0;
726 parse->priv->avg_bitrate = 0;
727 parse->priv->posted_avg_bitrate = 0;
729 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
730 parse->priv->index_last_offset = -1;
731 parse->priv->index_last_valid = TRUE;
732 parse->priv->upstream_seekable = FALSE;
733 parse->priv->upstream_size = 0;
734 parse->priv->upstream_has_duration = FALSE;
735 parse->priv->idx_interval = 0;
736 parse->priv->exact_position = TRUE;
737 parse->priv->seen_keyframe = FALSE;
739 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
740 parse->priv->last_offset = 0;
742 if (parse->priv->pending_segment) {
743 gst_event_unref (parse->priv->pending_segment);
744 parse->priv->pending_segment = NULL;
747 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
749 g_list_free (parse->priv->pending_events);
750 parse->priv->pending_events = NULL;
752 if (parse->priv->cache) {
753 gst_buffer_unref (parse->priv->cache);
754 parse->priv->cache = NULL;
757 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
758 g_slist_free (parse->priv->pending_seeks);
759 parse->priv->pending_seeks = NULL;
761 if (parse->priv->adapter)
762 gst_adapter_clear (parse->priv->adapter);
764 parse->priv->new_frame = TRUE;
766 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
767 g_list_free (parse->priv->detect_buffers);
768 parse->priv->detect_buffers = NULL;
769 parse->priv->detect_buffers_size = 0;
770 GST_OBJECT_UNLOCK (parse);
773 /* gst_base_parse_parse_frame:
774 * @parse: #GstBaseParse.
775 * @buffer: #GstBuffer.
777 * Default callback for parse_frame.
780 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
782 GstBuffer *buffer = frame->buffer;
784 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
785 GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) {
786 GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts;
788 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
789 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
790 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
795 /* gst_base_parse_convert:
796 * @parse: #GstBaseParse.
797 * @src_format: #GstFormat describing the source format.
798 * @src_value: Source value to be converted.
799 * @dest_format: #GstFormat defining the converted format.
800 * @dest_value: Pointer where the conversion result will be put.
802 * Converts using configured "convert" vmethod in #GstBaseParse class.
804 * Returns: TRUE if conversion was successful.
807 gst_base_parse_convert (GstBaseParse * parse,
808 GstFormat src_format,
809 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
811 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
814 g_return_val_if_fail (dest_value != NULL, FALSE);
819 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
821 #ifndef GST_DISABLE_GST_DEBUG
824 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
825 GST_LOG_OBJECT (parse,
826 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
827 GST_TIME_ARGS (src_value), *dest_value);
828 } else if (dest_format == GST_FORMAT_TIME &&
829 src_format == GST_FORMAT_BYTES) {
830 GST_LOG_OBJECT (parse,
831 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
832 src_value, GST_TIME_ARGS (*dest_value));
834 GST_LOG_OBJECT (parse,
835 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
836 GST_STR_NULL (gst_format_get_name (src_format)),
837 GST_STR_NULL (gst_format_get_name (dest_format)),
838 src_value, *dest_value);
841 GST_DEBUG_OBJECT (parse, "conversion failed");
849 /* gst_base_parse_sink_event:
850 * @pad: #GstPad that received the event.
851 * @event: #GstEvent to be handled.
853 * Handler for sink pad events.
855 * Returns: TRUE if the event was handled.
858 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
861 GstBaseParseClass *bclass;
864 parse = GST_BASE_PARSE (parent);
865 bclass = GST_BASE_PARSE_GET_CLASS (parse);
867 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
868 GST_EVENT_TYPE_NAME (event));
870 /* Cache all events except EOS, SEGMENT and FLUSH_STOP if we have a
872 if (parse->priv->pending_segment && GST_EVENT_TYPE (event) != GST_EVENT_EOS
873 && GST_EVENT_TYPE (event) != GST_EVENT_SEGMENT
874 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
875 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP
876 && GST_EVENT_TYPE (event) != GST_EVENT_CAPS) {
878 if (GST_EVENT_TYPE (event) == GST_EVENT_TAG)
879 /* See if any bitrate tags were posted */
880 gst_base_parse_handle_tag (parse, event);
882 parse->priv->pending_events =
883 g_list_append (parse->priv->pending_events, event);
887 if (GST_EVENT_TYPE (event) == GST_EVENT_EOS &&
888 parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
889 /* We've not posted bitrate tags yet - do so now */
890 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
893 ret = bclass->event (parse, event);
895 gst_event_unref (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)
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 ret = klass->set_sink_caps (parse, caps);
939 /* will send our own caps downstream */
940 gst_event_unref (event);
943 case GST_EVENT_SEGMENT:
945 const GstSegment *in_segment;
946 GstSegment out_segment;
947 gint64 offset = 0, next_ts;
950 gdouble rate, applied_rate;
952 gint64 start, stop, pos, next_ts;
956 gst_event_parse_segment (event, &in_segment);
957 gst_segment_init (&out_segment, GST_FORMAT_TIME);
959 GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
961 if (in_segment->format == GST_FORMAT_BYTES) {
962 GstBaseParseSeek *seek = NULL;
965 /* stop time is allowed to be open-ended, but not start & pos */
966 offset = in_segment->time;
968 GST_OBJECT_LOCK (parse);
969 for (node = parse->priv->pending_seeks; node; node = node->next) {
970 GstBaseParseSeek *tmp = node->data;
972 if (tmp->offset == offset) {
977 parse->priv->pending_seeks =
978 g_slist_remove (parse->priv->pending_seeks, seek);
979 GST_OBJECT_UNLOCK (parse);
982 GST_DEBUG_OBJECT (parse,
983 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
984 seek->accurate ? " accurate" : "", &seek->segment);
986 out_segment.start = seek->segment.start;
987 out_segment.stop = seek->segment.stop;
988 out_segment.time = seek->segment.start;
990 next_ts = seek->start_ts;
991 parse->priv->exact_position = seek->accurate;
994 /* best attempt convert */
995 /* as these are only estimates, stop is kept open-ended to avoid
996 * premature cutting */
997 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
998 GST_FORMAT_TIME, (gint64 *) & next_ts);
1000 out_segment.start = next_ts;
1001 out_segment.stop = GST_CLOCK_TIME_NONE;
1002 out_segment.time = next_ts;
1004 parse->priv->exact_position = (in_segment->start == 0);
1007 gst_event_unref (event);
1009 event = gst_event_new_segment (&out_segment);
1011 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1012 GST_SEGMENT_FORMAT, in_segment);
1014 } else if (in_segment->format != GST_FORMAT_TIME) {
1015 /* Unknown incoming segment format. Output a default open-ended
1017 gst_event_unref (event);
1019 out_segment.start = 0;
1020 out_segment.stop = GST_CLOCK_TIME_NONE;
1021 out_segment.time = 0;
1023 event = gst_event_new_segment (&out_segment);
1027 /* not considered BYTE seekable if it is talking to us in TIME,
1028 * whatever else it might claim */
1029 parse->priv->upstream_seekable = FALSE;
1030 next_ts = in_segment->start;
1033 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1036 gst_segment_set_newsegment (&parse->segment, update, rate,
1037 applied_rate, format, start, stop, start);
1040 /* save the segment for later, right before we push a new buffer so that
1041 * the caps are fixed and the next linked element can receive
1043 eventp = &parse->priv->pending_segment;
1044 gst_event_replace (eventp, event);
1045 gst_event_unref (event);
1048 /* but finish the current segment */
1049 GST_DEBUG_OBJECT (parse, "draining current segment");
1050 if (in_segment->rate > 0.0)
1051 gst_base_parse_drain (parse);
1053 gst_base_parse_finish_fragment (parse, FALSE);
1054 gst_adapter_clear (parse->priv->adapter);
1056 parse->priv->offset = offset;
1057 parse->priv->sync_offset = offset;
1058 parse->priv->next_ts = next_ts;
1059 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1060 parse->priv->discont = TRUE;
1061 parse->priv->seen_keyframe = FALSE;
1065 case GST_EVENT_FLUSH_START:
1066 parse->priv->flushing = TRUE;
1067 ret = gst_pad_push_event (parse->srcpad, event);
1068 /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
1069 GST_PAD_STREAM_LOCK (parse->srcpad);
1070 GST_PAD_STREAM_UNLOCK (parse->srcpad);
1073 case GST_EVENT_FLUSH_STOP:
1074 ret = gst_pad_push_event (parse->srcpad, event);
1075 gst_adapter_clear (parse->priv->adapter);
1076 gst_base_parse_clear_queues (parse);
1077 parse->priv->flushing = FALSE;
1078 parse->priv->discont = TRUE;
1079 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1080 parse->priv->new_frame = TRUE;
1084 if (parse->segment.rate > 0.0)
1085 gst_base_parse_drain (parse);
1087 gst_base_parse_finish_fragment (parse, TRUE);
1089 /* If we STILL have zero frames processed, fire an error */
1090 if (parse->priv->framecount == 0) {
1091 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1092 ("No valid frames found before end of stream"), (NULL));
1094 /* newsegment before eos */
1095 if (parse->priv->pending_segment) {
1096 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
1097 parse->priv->pending_segment = NULL;
1099 ret = gst_pad_push_event (parse->srcpad, event);
1104 gst_pad_event_default (parse->sinkpad, GST_OBJECT_CAST (parse),
1112 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1114 GstBaseParse *parse;
1115 GstBaseParseClass *bclass;
1118 parse = GST_BASE_PARSE (parent);
1119 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1121 switch (GST_QUERY_TYPE (query)) {
1122 case GST_QUERY_CAPS:
1124 if (bclass->get_sink_caps) {
1125 GstCaps *caps, *filter;
1127 gst_query_parse_caps (query, &filter);
1128 caps = bclass->get_sink_caps (parse, filter);
1129 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1131 gst_query_set_caps_result (query, caps);
1132 gst_caps_unref (caps);
1136 GstCaps *caps, *template_caps, *filter;
1138 gst_query_parse_caps (query, &filter);
1139 template_caps = gst_pad_get_pad_template_caps (pad);
1140 if (filter != NULL) {
1142 gst_caps_intersect_full (filter, template_caps,
1143 GST_CAPS_INTERSECT_FIRST);
1144 gst_caps_unref (template_caps);
1146 caps = template_caps;
1148 gst_query_set_caps_result (query, caps);
1149 gst_caps_unref (caps);
1157 res = gst_pad_query_default (pad, parent, query);
1166 /* gst_base_parse_src_event:
1167 * @pad: #GstPad that received the event.
1168 * @event: #GstEvent that was received.
1170 * Handler for source pad events.
1172 * Returns: TRUE if the event was handled.
1175 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1177 GstBaseParse *parse;
1178 GstBaseParseClass *bclass;
1179 gboolean ret = TRUE;
1181 parse = GST_BASE_PARSE (parent);
1182 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1184 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1185 GST_EVENT_TYPE_NAME (event));
1187 if (bclass->src_event)
1188 ret = bclass->src_event (parse, event);
1190 gst_event_unref (event);
1196 gst_base_parse_is_seekable (GstBaseParse * parse)
1198 /* FIXME: could do more here, e.g. check index or just send data from 0
1199 * in pull mode and let decoder/sink clip */
1200 return parse->priv->syncable;
1203 /* gst_base_parse_src_eventfunc:
1204 * @parse: #GstBaseParse.
1205 * @event: #GstEvent that was received.
1207 * Default srcpad event handler.
1209 * Returns: TRUE if the event was handled and can be dropped.
1212 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1214 gboolean res = FALSE;
1216 switch (GST_EVENT_TYPE (event)) {
1217 case GST_EVENT_SEEK:
1218 if (gst_base_parse_is_seekable (parse))
1219 res = gst_base_parse_handle_seek (parse, event);
1222 res = gst_pad_event_default (parse->srcpad, GST_OBJECT_CAST (parse),
1231 * gst_base_parse_convert_default:
1232 * @parse: #GstBaseParse.
1233 * @src_format: #GstFormat describing the source format.
1234 * @src_value: Source value to be converted.
1235 * @dest_format: #GstFormat defining the converted format.
1236 * @dest_value: Pointer where the conversion result will be put.
1238 * Default implementation of "convert" vmethod in #GstBaseParse class.
1240 * Returns: TRUE if conversion was successful.
1245 gst_base_parse_convert_default (GstBaseParse * parse,
1246 GstFormat src_format,
1247 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1249 gboolean ret = FALSE;
1250 guint64 bytes, duration;
1252 if (G_UNLIKELY (src_format == dest_format)) {
1253 *dest_value = src_value;
1257 if (G_UNLIKELY (src_value == -1)) {
1262 if (G_UNLIKELY (src_value == 0)) {
1267 /* need at least some frames */
1268 if (!parse->priv->framecount)
1271 duration = parse->priv->acc_duration / GST_MSECOND;
1272 bytes = parse->priv->bytecount;
1274 if (G_UNLIKELY (!duration || !bytes))
1275 goto no_duration_bytes;
1277 if (src_format == GST_FORMAT_BYTES) {
1278 if (dest_format == GST_FORMAT_TIME) {
1279 /* BYTES -> TIME conversion */
1280 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1281 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1282 *dest_value *= GST_MSECOND;
1283 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1284 *dest_value / GST_MSECOND);
1287 GST_DEBUG_OBJECT (parse, "converting bytes -> other not implemented");
1289 } else if (src_format == GST_FORMAT_TIME) {
1290 if (dest_format == GST_FORMAT_BYTES) {
1291 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1292 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1294 GST_DEBUG_OBJECT (parse,
1295 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1296 src_value / GST_MSECOND, *dest_value);
1299 GST_DEBUG_OBJECT (parse, "converting time -> other not implemented");
1301 } else if (src_format == GST_FORMAT_DEFAULT) {
1302 /* DEFAULT == frame-based */
1303 if (dest_format == GST_FORMAT_TIME) {
1304 GST_DEBUG_OBJECT (parse, "converting default -> time");
1305 if (parse->priv->fps_den) {
1306 *dest_value = gst_util_uint64_scale (src_value,
1307 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1311 GST_DEBUG_OBJECT (parse, "converting default -> other not implemented");
1314 GST_DEBUG_OBJECT (parse, "conversion not implemented");
1321 GST_DEBUG_OBJECT (parse, "no framecount");
1326 GST_DEBUG_OBJECT (parse, "no duration %" G_GUINT64_FORMAT ", bytes %"
1327 G_GUINT64_FORMAT, duration, bytes);
1334 gst_base_parse_update_duration (GstBaseParse * baseparse)
1337 GstBaseParse *parse;
1339 parse = GST_BASE_PARSE (baseparse);
1341 peer = gst_pad_get_peer (parse->sinkpad);
1343 gboolean qres = FALSE;
1344 gint64 ptot, dest_value;
1346 qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot);
1347 gst_object_unref (GST_OBJECT (peer));
1349 if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1350 GST_FORMAT_TIME, &dest_value)) {
1352 /* inform if duration changed, but try to avoid spamming */
1353 parse->priv->estimated_drift +=
1354 dest_value - parse->priv->estimated_duration;
1355 if (parse->priv->estimated_drift > GST_SECOND ||
1356 parse->priv->estimated_drift < -GST_SECOND) {
1357 gst_element_post_message (GST_ELEMENT (parse),
1358 gst_message_new_duration (GST_OBJECT (parse),
1359 GST_FORMAT_TIME, dest_value));
1360 parse->priv->estimated_drift = 0;
1362 parse->priv->estimated_duration = dest_value;
1363 GST_LOG_OBJECT (parse,
1364 "updated estimated duration to %" GST_TIME_FORMAT,
1365 GST_TIME_ARGS (dest_value));
1372 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1373 gboolean post_avg, gboolean post_max)
1375 GstTagList *taglist = NULL;
1377 if (post_min && parse->priv->post_min_bitrate) {
1378 taglist = gst_tag_list_new_empty ();
1380 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1381 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1384 if (post_avg && parse->priv->post_avg_bitrate) {
1385 if (taglist == NULL)
1386 taglist = gst_tag_list_new_empty ();
1388 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1389 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1390 parse->priv->avg_bitrate, NULL);
1393 if (post_max && parse->priv->post_max_bitrate) {
1394 if (taglist == NULL)
1395 taglist = gst_tag_list_new_empty ();
1397 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1398 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1401 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1402 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1403 parse->priv->max_bitrate);
1405 if (taglist != NULL) {
1406 gst_pad_push_event (parse->srcpad, gst_event_new_tag (taglist));
1410 /* gst_base_parse_update_bitrates:
1411 * @parse: #GstBaseParse.
1412 * @buffer: Current frame as a #GstBuffer
1414 * Keeps track of the minimum and maximum bitrates, and also maintains a
1415 * running average bitrate of the stream so far.
1418 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1420 /* Only update the tag on a 10 kbps delta */
1421 static const gint update_threshold = 10000;
1423 guint64 data_len, frame_dur;
1424 gint overhead, frame_bitrate, old_avg_bitrate;
1425 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1426 GstBuffer *buffer = frame->buffer;
1428 overhead = frame->overhead;
1432 data_len = gst_buffer_get_size (buffer) - overhead;
1433 parse->priv->data_bytecount += data_len;
1435 /* duration should be valid by now,
1436 * either set by subclass or maybe based on fps settings */
1437 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1438 /* Calculate duration of a frame from buffer properties */
1439 frame_dur = GST_BUFFER_DURATION (buffer);
1440 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1441 parse->priv->acc_duration;
1444 /* No way to figure out frame duration (is this even possible?) */
1448 /* override if subclass provided bitrate, e.g. metadata based */
1449 if (parse->priv->bitrate) {
1450 parse->priv->avg_bitrate = parse->priv->bitrate;
1451 /* spread this (confirmed) info ASAP */
1452 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1453 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1457 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1461 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1462 parse->priv->avg_bitrate);
1464 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1466 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1467 /* always post all at threshold time */
1468 update_min = update_max = update_avg = TRUE;
1471 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1472 if (frame_bitrate < parse->priv->min_bitrate) {
1473 parse->priv->min_bitrate = frame_bitrate;
1477 if (frame_bitrate > parse->priv->max_bitrate) {
1478 parse->priv->max_bitrate = frame_bitrate;
1482 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1483 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1484 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1489 if ((update_min || update_avg || update_max))
1490 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1497 * gst_base_parse_add_index_entry:
1498 * @parse: #GstBaseParse.
1499 * @offset: offset of entry
1500 * @ts: timestamp associated with offset
1501 * @key: whether entry refers to keyframe
1502 * @force: add entry disregarding sanity checks
1504 * Adds an entry to the index associating @offset to @ts. It is recommended
1505 * to only add keyframe entries. @force allows to bypass checks, such as
1506 * whether the stream is (upstream) seekable, another entry is already "close"
1507 * to the new entry, etc.
1509 * Returns: #gboolean indicating whether entry was added
1514 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1515 GstClockTime ts, gboolean key, gboolean force)
1517 gboolean ret = FALSE;
1518 GstIndexAssociation associations[2];
1520 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1521 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1523 if (G_LIKELY (!force)) {
1525 if (!parse->priv->upstream_seekable) {
1526 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1530 /* FIXME need better helper data structure that handles these issues
1531 * related to ongoing collecting of index entries */
1532 if (parse->priv->index_last_offset >= (gint64) offset) {
1533 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1534 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1538 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1539 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1540 parse->priv->idx_interval) {
1541 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1542 GST_TIME_ARGS (parse->priv->index_last_ts));
1546 /* if last is not really the last one */
1547 if (!parse->priv->index_last_valid) {
1548 GstClockTime prev_ts;
1550 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1551 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1552 GST_DEBUG_OBJECT (parse,
1553 "entry too close to existing entry %" GST_TIME_FORMAT,
1554 GST_TIME_ARGS (prev_ts));
1555 parse->priv->index_last_offset = offset;
1556 parse->priv->index_last_ts = ts;
1562 associations[0].format = GST_FORMAT_TIME;
1563 associations[0].value = ts;
1564 associations[1].format = GST_FORMAT_BYTES;
1565 associations[1].value = offset;
1567 /* index might change on-the-fly, although that would be nutty app ... */
1568 GST_BASE_PARSE_INDEX_LOCK (parse);
1569 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1570 (key) ? GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT :
1571 GST_INDEX_ASSOCIATION_FLAG_DELTA_UNIT, 2,
1572 (const GstIndexAssociation *) &associations);
1573 GST_BASE_PARSE_INDEX_UNLOCK (parse);
1576 parse->priv->index_last_offset = offset;
1577 parse->priv->index_last_ts = ts;
1586 /* check for seekable upstream, above and beyond a mere query */
1588 gst_base_parse_check_seekability (GstBaseParse * parse)
1591 gboolean seekable = FALSE;
1592 gint64 start = -1, stop = -1;
1593 guint idx_interval = 0;
1595 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1596 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1597 GST_DEBUG_OBJECT (parse, "seeking query failed");
1601 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1603 /* try harder to query upstream size if we didn't get it the first time */
1604 if (seekable && stop == -1) {
1605 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1606 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1609 /* if upstream doesn't know the size, it's likely that it's not seekable in
1610 * practice even if it technically may be seekable */
1611 if (seekable && (start != 0 || stop <= start)) {
1612 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1616 /* let's not put every single frame into our index */
1618 if (stop < 10 * 1024 * 1024)
1620 else if (stop < 100 * 1024 * 1024)
1623 idx_interval = 1000;
1627 gst_query_unref (query);
1629 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1630 G_GUINT64_FORMAT ")", seekable, start, stop);
1631 parse->priv->upstream_seekable = seekable;
1632 parse->priv->upstream_size = seekable ? stop : 0;
1634 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1635 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1638 /* some misc checks on upstream */
1640 gst_base_parse_check_upstream (GstBaseParse * parse)
1644 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
1645 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1646 /* upstream has one, accept it also, and no further updates */
1647 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1648 parse->priv->upstream_has_duration = TRUE;
1651 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1652 parse->priv->upstream_has_duration);
1655 /* checks src caps to determine if dealing with audio or video */
1656 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1658 gst_base_parse_check_media (GstBaseParse * parse)
1663 caps = gst_pad_get_current_caps (parse->srcpad);
1664 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1665 parse->priv->is_video =
1666 g_str_has_prefix (gst_structure_get_name (s), "video");
1668 /* historical default */
1669 parse->priv->is_video = FALSE;
1672 gst_caps_unref (caps);
1674 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1677 /* takes ownership of frame */
1679 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1681 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1682 /* frame allocated on the heap, we can just take ownership */
1683 g_queue_push_tail (&parse->priv->queued_frames, frame);
1684 GST_TRACE ("queued frame %p", frame);
1686 GstBaseParseFrame *copy;
1688 /* probably allocated on the stack, must make a proper copy */
1689 copy = gst_base_parse_frame_copy (frame);
1690 g_queue_push_tail (&parse->priv->queued_frames, copy);
1691 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1692 gst_base_parse_frame_free (frame);
1696 /* makes sure that @buf is properly prepared and decorated for passing
1697 * to baseclass, and an equally setup frame is returned setup with @buf.
1698 * Takes ownership of @buf. */
1699 static GstBaseParseFrame *
1700 gst_base_parse_prepare_frame (GstBaseParse * parse, GstBuffer * buffer)
1702 GstBaseParseFrame *frame = NULL;
1704 buffer = gst_buffer_make_writable (buffer);
1706 GST_LOG_OBJECT (parse,
1707 "preparing frame at offset %" G_GUINT64_FORMAT
1708 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
1709 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1710 gst_buffer_get_size (buffer));
1712 if (parse->priv->discont) {
1713 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1714 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1715 parse->priv->discont = FALSE;
1718 GST_BUFFER_OFFSET (buffer) = parse->priv->offset;
1720 frame = gst_base_parse_frame_new (buffer, 0, 0);
1722 /* also ensure to update state flags */
1723 gst_base_parse_frame_update (parse, frame, buffer);
1724 gst_buffer_unref (buffer);
1726 if (parse->priv->prev_offset != parse->priv->offset || parse->priv->new_frame) {
1727 GST_LOG_OBJECT (parse, "marking as new frame");
1728 parse->priv->new_frame = FALSE;
1729 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME;
1732 frame->offset = parse->priv->prev_offset = parse->priv->offset;
1734 /* use default handler to provide initial (upstream) metadata */
1735 gst_base_parse_parse_frame (parse, frame);
1740 /* Wraps buffer in a frame and dispatches to subclass.
1741 * Also manages data skipping and offset handling (including adapter flushing).
1742 * Takes ownership of @buffer */
1743 static GstFlowReturn
1744 gst_base_parse_handle_buffer (GstBaseParse * parse, GstBuffer * buffer,
1745 gint * skip, gint * flushed)
1747 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1748 GstBaseParseFrame *frame;
1751 g_return_val_if_fail (skip != NULL || flushed != NULL, GST_FLOW_ERROR);
1753 GST_LOG_OBJECT (parse,
1754 "handling buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT
1755 ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer),
1756 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1757 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1759 /* track what is being flushed during this single round of frame processing */
1760 parse->priv->flushed = 0;
1763 /* make it easy for _finish_frame to pick up input data */
1764 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1765 gst_buffer_ref (buffer);
1766 gst_adapter_push (parse->priv->adapter, buffer);
1769 frame = gst_base_parse_prepare_frame (parse, buffer);
1770 ret = klass->handle_frame (parse, frame, skip);
1772 *flushed = parse->priv->flushed;
1774 GST_LOG_OBJECT (parse, "handle_frame skipped %d, flushed %d",
1777 if (ret != GST_FLOW_OK) {
1778 GST_DEBUG_OBJECT (parse, "handle_frame returned %d", ret);
1782 /* subclass can only do one of these, or semantics are too unclear */
1783 g_assert (*skip == 0 || *flushed == 0);
1785 /* track skipping */
1787 GstClockTime timestamp;
1790 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", *skip);
1791 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
1792 /* reverse playback, and no frames found yet, so we are skipping
1793 * the leading part of a fragment, which may form the tail of
1794 * fragment coming later, hopefully subclass skips efficiently ... */
1795 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
1796 outbuf = gst_adapter_take_buffer (parse->priv->adapter, *skip);
1797 outbuf = gst_buffer_make_writable (outbuf);
1798 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
1799 parse->priv->buffers_head =
1800 g_slist_prepend (parse->priv->buffers_head, outbuf);
1803 gst_adapter_flush (parse->priv->adapter, *skip);
1805 if (!parse->priv->discont)
1806 parse->priv->sync_offset = parse->priv->offset;
1807 parse->priv->offset += *skip;
1808 parse->priv->discont = TRUE;
1809 /* check for indefinite skipping */
1810 if (ret == GST_FLOW_OK)
1811 ret = gst_base_parse_check_sync (parse);
1814 parse->priv->offset += *flushed;
1817 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1818 gst_adapter_clear (parse->priv->adapter);
1821 gst_base_parse_frame_free (frame);
1826 /* gst_base_parse_handle_and_push_buffer:
1827 * @parse: #GstBaseParse.
1828 * @klass: #GstBaseParseClass.
1829 * @frame: (transfer full): a #GstBaseParseFrame
1831 * Parses the frame from given buffer and pushes it forward. Also performs
1832 * timestamp handling and checks the segment limits.
1834 * This is called with srcpad STREAM_LOCK held.
1836 * Returns: #GstFlowReturn
1838 static GstFlowReturn
1839 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1840 GstBaseParseFrame * frame)
1845 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1847 /* some one-time start-up */
1848 if (G_UNLIKELY (!parse->priv->framecount)) {
1849 gst_base_parse_check_seekability (parse);
1850 gst_base_parse_check_upstream (parse);
1853 buffer = frame->buffer;
1854 offset = frame->offset;
1856 /* check if subclass/format can provide ts.
1857 * If so, that allows and enables extra seek and duration determining options */
1858 if (G_UNLIKELY (parse->priv->first_frame_offset < 0)) {
1859 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1860 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1861 parse->priv->first_frame_offset = offset;
1862 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1863 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1864 " for first frame at offset %" G_GINT64_FORMAT,
1865 GST_TIME_ARGS (parse->priv->first_frame_ts),
1866 parse->priv->first_frame_offset);
1867 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1869 GstClockTime last_ts = G_MAXINT64;
1871 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1872 gst_base_parse_locate_time (parse, &last_ts, &off);
1873 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1874 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1877 /* disable further checks */
1878 parse->priv->first_frame_offset = 0;
1882 /* again use default handler to add missing metadata;
1883 * we may have new information on frame properties */
1884 gst_base_parse_parse_frame (parse, frame);
1885 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1886 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1887 parse->priv->next_ts =
1888 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1890 /* we lost track, do not produce bogus time next time around
1891 * (probably means parser subclass has given up on parsing as well) */
1892 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1893 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1896 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1897 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1898 gst_base_parse_add_index_entry (parse, offset,
1899 GST_BUFFER_TIMESTAMP (buffer),
1900 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1902 /* All OK, push queued frames if there are any */
1903 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1904 GstBaseParseFrame *queued_frame;
1906 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1907 gst_base_parse_push_frame (parse, queued_frame);
1911 return gst_base_parse_push_frame (parse, frame);
1915 * gst_base_parse_push_frame:
1916 * @parse: #GstBaseParse.
1917 * @frame: (transfer none): a #GstBaseParseFrame
1919 * Pushes the frame's buffer downstream, sends any pending events and
1920 * does some timestamp and segment handling. Takes ownership of
1921 * frame's buffer, though caller retains ownership of @frame.
1923 * This must be called with sinkpad STREAM_LOCK held.
1925 * Returns: #GstFlowReturn
1930 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1932 GstFlowReturn ret = GST_FLOW_OK;
1933 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1934 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1935 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1939 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1940 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1942 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1944 buffer = frame->buffer;
1946 GST_LOG_OBJECT (parse,
1947 "processing buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT
1948 ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer),
1949 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1950 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1953 parse->priv->bytecount += frame->size;
1954 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1955 parse->priv->framecount++;
1956 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1957 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1960 /* 0 means disabled */
1961 if (parse->priv->update_interval < 0)
1962 parse->priv->update_interval = 50;
1963 else if (parse->priv->update_interval > 0 &&
1964 (parse->priv->framecount % parse->priv->update_interval) == 0)
1965 gst_base_parse_update_duration (parse);
1967 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1968 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1969 if (last_start != GST_CLOCK_TIME_NONE
1970 && GST_BUFFER_DURATION_IS_VALID (buffer))
1971 last_stop = last_start + GST_BUFFER_DURATION (buffer);
1973 /* should have caps by now */
1974 if (!gst_pad_has_current_caps (parse->srcpad))
1977 /* segment adjustment magic; only if we are running the whole show */
1978 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
1979 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
1980 parse->priv->upstream_seekable)) {
1981 /* segment times are typically estimates,
1982 * actual frame data might lead subclass to different timestamps,
1983 * so override segment start from what is supplied there */
1984 if (G_UNLIKELY (parse->priv->pending_segment && !parse->priv->exact_position
1985 && GST_CLOCK_TIME_IS_VALID (last_start))) {
1986 gst_event_unref (parse->priv->pending_segment);
1987 parse->segment.start =
1988 MIN ((guint64) last_start, (guint64) parse->segment.stop);
1990 GST_DEBUG_OBJECT (parse,
1991 "adjusting pending segment start to %" GST_TIME_FORMAT,
1992 GST_TIME_ARGS (parse->segment.start));
1994 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
1996 /* handle gaps, e.g. non-zero start-time, in as much not handled by above */
1997 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
1998 GST_CLOCK_TIME_IS_VALID (last_start)) {
1999 GstClockTimeDiff diff;
2001 /* only send newsegments with increasing start times,
2002 * otherwise if these go back and forth downstream (sinks) increase
2003 * accumulated time and running_time */
2004 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
2005 if (G_UNLIKELY (diff > 2 * GST_SECOND
2006 && last_start > parse->segment.start
2007 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
2008 || last_start < parse->segment.stop))) {
2010 GST_DEBUG_OBJECT (parse,
2011 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
2012 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
2013 "Sending updated NEWSEGMENT events", diff,
2014 GST_TIME_ARGS (parse->segment.position),
2015 GST_TIME_ARGS (last_start));
2017 if (G_UNLIKELY (parse->priv->pending_segment)) {
2018 gst_event_unref (parse->priv->pending_segment);
2019 parse->segment.start = last_start;
2020 parse->segment.time = last_start;
2021 parse->priv->pending_segment =
2022 gst_event_new_segment (&parse->segment);
2024 /* skip gap FIXME */
2025 gst_pad_push_event (parse->srcpad,
2026 gst_event_new_segment (&parse->segment));
2028 parse->segment.position = last_start;
2033 if (G_UNLIKELY (parse->priv->pending_segment)) {
2034 GstEvent *pending_segment;
2036 pending_segment = parse->priv->pending_segment;
2037 parse->priv->pending_segment = NULL;
2039 GST_DEBUG_OBJECT (parse, "%s push pending segment",
2040 parse->priv->pad_mode == GST_PAD_MODE_PULL ? "loop" : "chain");
2041 gst_pad_push_event (parse->srcpad, pending_segment);
2043 /* have caps; check identity */
2044 gst_base_parse_check_media (parse);
2047 /* update bitrates and optionally post corresponding tags
2048 * (following newsegment) */
2049 gst_base_parse_update_bitrates (parse, frame);
2051 if (G_UNLIKELY (parse->priv->pending_events)) {
2054 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
2055 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
2057 g_list_free (parse->priv->pending_events);
2058 parse->priv->pending_events = NULL;
2061 if (klass->pre_push_frame) {
2062 ret = klass->pre_push_frame (parse, frame);
2064 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
2067 /* take final ownership of frame buffer */
2068 if (frame->out_buffer) {
2069 buffer = frame->out_buffer;
2070 frame->out_buffer = NULL;
2071 gst_buffer_replace (&frame->buffer, NULL);
2073 buffer = frame->buffer;
2074 frame->buffer = NULL;
2077 /* subclass must play nice */
2078 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2080 size = gst_buffer_get_size (buffer);
2082 parse->priv->seen_keyframe |= parse->priv->is_video &&
2083 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
2085 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
2086 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2087 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
2088 GST_BUFFER_TIMESTAMP (buffer) >
2089 parse->segment.stop + parse->priv->lead_out_ts) {
2090 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
2092 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2093 GST_BUFFER_DURATION_IS_VALID (buffer) &&
2094 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
2095 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
2096 parse->priv->lead_in_ts < parse->segment.start) {
2097 if (parse->priv->seen_keyframe) {
2098 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
2101 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
2102 ret = GST_BASE_PARSE_FLOW_DROPPED;
2109 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2110 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2111 gst_buffer_unref (buffer);
2113 } else if (ret == GST_FLOW_OK) {
2114 if (parse->segment.rate > 0.0) {
2115 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2117 ret = gst_pad_push (parse->srcpad, buffer);
2118 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2120 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2122 parse->priv->buffers_queued =
2123 g_slist_prepend (parse->priv->buffers_queued, buffer);
2127 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2128 size, gst_flow_get_name (ret));
2129 gst_buffer_unref (buffer);
2130 /* if we are not sufficiently in control, let upstream decide on EOS */
2131 if (ret == GST_FLOW_EOS &&
2132 (parse->priv->passthrough ||
2133 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2134 !parse->priv->upstream_seekable)))
2138 /* Update current running segment position */
2139 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
2140 parse->segment.position < last_stop)
2141 parse->segment.position = last_stop;
2148 GST_ELEMENT_ERROR (parse, STREAM, DECODE, ("No caps set"), (NULL));
2149 return GST_FLOW_ERROR;
2154 * gst_base_parse_finish_frame:
2155 * @parse: a #GstBaseParse
2156 * @frame: a #GstBaseParseFrame
2157 * @size: consumed input data represented by frame
2159 * Collects parsed data and pushes this downstream.
2160 * Source pad caps must be set when this is called.
2162 * If @frame's out_buffer is set, that will be used as subsequent frame data.
2163 * Otherwise, @size samples will be taken from the input and used for output,
2164 * and the output's metadata (timestamps etc) will be taken as (optionally)
2165 * set by the subclass on @frame's (input) buffer (which is otherwise
2166 * ignored for any but the above purpose/information).
2168 * Note that the latter buffer is invalidated by this call, whereas the
2169 * caller retains ownership of @frame.
2171 * Returns: a #GstFlowReturn that should be escalated to caller (of caller)
2176 gst_base_parse_finish_frame (GstBaseParse * parse, GstBaseParseFrame * frame,
2179 GstFlowReturn ret = GST_FLOW_OK;
2181 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2182 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
2183 g_return_val_if_fail (size > 0 || frame->out_buffer, GST_FLOW_ERROR);
2184 g_return_val_if_fail (gst_adapter_available (parse->priv->adapter) >= size,
2187 GST_LOG_OBJECT (parse, "finished frame at offset %" G_GUINT64_FORMAT ", "
2188 "flushing size %d", frame->offset, size);
2190 if (parse->priv->scanning && frame->buffer) {
2191 if (!parse->priv->scanned_frame) {
2192 parse->priv->scanned_frame = gst_base_parse_frame_copy (frame);
2197 parse->priv->flushed += size;
2199 /* either PUSH or PULL mode arranges for adapter data */
2200 /* ensure output buffer */
2201 if (!frame->out_buffer) {
2202 GstBuffer *src, *dest;
2204 frame->out_buffer = gst_adapter_take_buffer (parse->priv->adapter, size);
2205 dest = frame->out_buffer;
2206 src = frame->buffer;
2207 GST_BUFFER_PTS (dest) = GST_BUFFER_PTS (src);
2208 GST_BUFFER_DTS (dest) = GST_BUFFER_DTS (src);
2209 GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src);
2210 GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src);
2211 GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src);
2212 GST_MINI_OBJECT_FLAGS (dest) = GST_MINI_OBJECT_FLAGS (src);
2214 gst_adapter_flush (parse->priv->adapter, size);
2217 /* use as input for subsequent processing */
2218 gst_buffer_replace (&frame->buffer, frame->out_buffer);
2219 gst_buffer_unref (frame->out_buffer);
2220 frame->out_buffer = NULL;
2222 /* mark input size consumed */
2225 /* subclass might queue frames/data internally if it needs more
2226 * frames to decide on the format, or might request us to queue here. */
2227 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_DROP) {
2228 gst_buffer_replace (&frame->buffer, NULL);
2230 } else if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_QUEUE) {
2231 GstBaseParseFrame *copy;
2233 copy = gst_base_parse_frame_copy (frame);
2234 copy->flags &= ~GST_BASE_PARSE_FRAME_FLAG_QUEUE;
2235 gst_base_parse_queue_frame (parse, copy);
2239 ret = gst_base_parse_handle_and_push_frame (parse, frame);
2245 /* gst_base_parse_drain:
2247 * Drains the adapter until it is empty. It decreases the min_frame_size to
2248 * match the current adapter size and calls chain method until the adapter
2249 * is emptied or chain returns with error.
2252 gst_base_parse_drain (GstBaseParse * parse)
2256 GST_DEBUG_OBJECT (parse, "draining");
2257 parse->priv->drain = TRUE;
2260 avail = gst_adapter_available (parse->priv->adapter);
2264 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2265 NULL) != GST_FLOW_OK) {
2269 /* nothing changed, maybe due to truncated frame; break infinite loop */
2270 if (avail == gst_adapter_available (parse->priv->adapter)) {
2271 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2272 gst_adapter_clear (parse->priv->adapter);
2276 parse->priv->drain = FALSE;
2279 /* gst_base_parse_send_buffers
2281 * Sends buffers collected in send_buffers downstream, and ensures that list
2282 * is empty at the end (errors or not).
2284 static GstFlowReturn
2285 gst_base_parse_send_buffers (GstBaseParse * parse)
2287 GSList *send = NULL;
2289 GstFlowReturn ret = GST_FLOW_OK;
2291 send = parse->priv->buffers_send;
2295 buf = GST_BUFFER_CAST (send->data);
2296 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
2297 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2298 ", offset %" G_GINT64_FORMAT, buf,
2299 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
2300 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2302 /* iterate output queue an push downstream */
2303 ret = gst_pad_push (parse->srcpad, buf);
2304 send = g_slist_delete_link (send, send);
2306 /* clear any leftover if error */
2307 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2309 buf = GST_BUFFER_CAST (send->data);
2310 gst_buffer_unref (buf);
2311 send = g_slist_delete_link (send, send);
2316 parse->priv->buffers_send = send;
2321 /* gst_base_parse_start_fragment:
2323 * Prepares for processing a reverse playback (forward) fragment
2324 * by (re)setting proper state variables.
2326 static GstFlowReturn
2327 gst_base_parse_start_fragment (GstBaseParse * parse)
2329 GST_LOG_OBJECT (parse, "starting fragment");
2331 /* invalidate so no fall-back timestamping is performed;
2332 * ok if taken from subclass or upstream */
2333 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2334 parse->priv->prev_ts = GST_CLOCK_TIME_NONE;
2335 /* prevent it hanging around stop all the time */
2336 parse->segment.position = GST_CLOCK_TIME_NONE;
2338 parse->priv->discont = TRUE;
2340 /* head of previous fragment is now pending tail of current fragment */
2341 parse->priv->buffers_pending = parse->priv->buffers_head;
2342 parse->priv->buffers_head = NULL;
2348 /* gst_base_parse_finish_fragment:
2350 * Processes a reverse playback (forward) fragment:
2351 * - append head of last fragment that was skipped to current fragment data
2352 * - drain the resulting current fragment data (i.e. repeated chain)
2353 * - add time/duration (if needed) to frames queued by chain
2354 * - push queued data
2356 static GstFlowReturn
2357 gst_base_parse_finish_fragment (GstBaseParse * parse, gboolean prev_head)
2360 GstFlowReturn ret = GST_FLOW_OK;
2361 gboolean seen_key = FALSE, seen_delta = FALSE;
2363 GST_LOG_OBJECT (parse, "finishing fragment");
2366 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2367 while (parse->priv->buffers_pending) {
2368 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2370 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2371 gst_buffer_get_size (buf));
2372 gst_adapter_push (parse->priv->adapter, buf);
2374 GST_LOG_OBJECT (parse, "discarding head buffer");
2375 gst_buffer_unref (buf);
2377 parse->priv->buffers_pending =
2378 g_slist_delete_link (parse->priv->buffers_pending,
2379 parse->priv->buffers_pending);
2382 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2383 /* initial skipped data is added to buffers_pending */
2384 gst_base_parse_drain (parse);
2386 if (parse->priv->buffers_send) {
2387 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2388 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2391 /* add metadata (if needed to queued buffers */
2392 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2393 GST_TIME_ARGS (parse->priv->last_ts));
2394 while (parse->priv->buffers_queued) {
2395 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2397 /* no touching if upstream or parsing provided time */
2398 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2399 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2400 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2401 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2402 GST_BUFFER_DURATION_IS_VALID (buf)) {
2403 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2404 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2406 parse->priv->last_ts = 0;
2407 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2408 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2409 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2411 /* no idea, very bad */
2412 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2415 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2417 /* reverse order for ascending sending */
2418 /* send downstream at keyframe not preceded by a keyframe
2419 * (e.g. that should identify start of collection of IDR nals) */
2420 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2422 ret = gst_base_parse_send_buffers (parse);
2423 /* if a problem, throw all to sending */
2424 if (ret != GST_FLOW_OK) {
2425 parse->priv->buffers_send =
2426 g_slist_reverse (parse->priv->buffers_queued);
2427 parse->priv->buffers_queued = NULL;
2437 parse->priv->buffers_send =
2438 g_slist_prepend (parse->priv->buffers_send, buf);
2439 parse->priv->buffers_queued =
2440 g_slist_delete_link (parse->priv->buffers_queued,
2441 parse->priv->buffers_queued);
2444 /* audio may have all marked as keyframe, so arrange to send here */
2446 ret = gst_base_parse_send_buffers (parse);
2448 /* any trailing unused no longer usable (ideally none) */
2449 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2450 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2451 gst_adapter_available (parse->priv->adapter));
2452 gst_adapter_clear (parse->priv->adapter);
2458 /* small helper that checks whether we have been trying to resync too long */
2459 static inline GstFlowReturn
2460 gst_base_parse_check_sync (GstBaseParse * parse)
2462 if (G_UNLIKELY (parse->priv->discont &&
2463 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2464 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2465 ("Failed to parse stream"), (NULL));
2466 return GST_FLOW_ERROR;
2472 static GstFlowReturn
2473 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
2475 GstBaseParseClass *bclass;
2476 GstBaseParse *parse;
2477 GstFlowReturn ret = GST_FLOW_OK;
2478 GstBuffer *tmpbuf = NULL;
2483 GstClockTime timestamp;
2485 parse = GST_BASE_PARSE (parent);
2486 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2488 if (parse->priv->detecting) {
2489 GstBuffer *detect_buf;
2491 if (parse->priv->detect_buffers_size == 0) {
2492 detect_buf = gst_buffer_ref (buffer);
2497 detect_buf = gst_buffer_new ();
2499 for (l = parse->priv->detect_buffers; l; l = l->next) {
2500 gsize tmpsize = gst_buffer_get_size (l->data);
2502 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
2503 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
2507 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
2508 offset, gst_buffer_get_size (buffer));
2511 ret = bclass->detect (parse, detect_buf);
2512 gst_buffer_unref (detect_buf);
2514 if (ret == GST_FLOW_OK) {
2517 /* Detected something */
2518 parse->priv->detecting = FALSE;
2520 for (l = parse->priv->detect_buffers; l; l = l->next) {
2521 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2523 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2524 parent, GST_BUFFER_CAST (l->data));
2526 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2528 g_list_free (parse->priv->detect_buffers);
2529 parse->priv->detect_buffers = NULL;
2530 parse->priv->detect_buffers_size = 0;
2532 if (ret != GST_FLOW_OK) {
2536 /* Handle the current buffer */
2537 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2538 /* Still detecting, append buffer or error out if draining */
2540 if (parse->priv->drain) {
2541 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2542 return GST_FLOW_ERROR;
2543 } else if (parse->priv->flushing) {
2544 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2546 g_list_free (parse->priv->detect_buffers);
2547 parse->priv->detect_buffers = NULL;
2548 parse->priv->detect_buffers_size = 0;
2550 parse->priv->detect_buffers =
2551 g_list_append (parse->priv->detect_buffers, buffer);
2552 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
2556 /* Something went wrong, subclass responsible for error reporting */
2560 /* And now handle the current buffer if detection worked */
2563 if (G_LIKELY (buffer)) {
2564 GST_LOG_OBJECT (parse,
2565 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT,
2566 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer));
2567 if (G_UNLIKELY (parse->priv->passthrough)) {
2568 GstBaseParseFrame frame;
2570 gst_base_parse_frame_init (&frame);
2571 frame.buffer = gst_buffer_make_writable (buffer);
2572 ret = gst_base_parse_push_frame (parse, &frame);
2573 gst_base_parse_frame_free (&frame);
2576 /* upstream feeding us in reverse playback;
2577 * finish previous fragment and start new upon DISCONT */
2578 if (parse->segment.rate < 0.0) {
2579 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2580 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2581 ret = gst_base_parse_finish_fragment (parse, TRUE);
2582 gst_base_parse_start_fragment (parse);
2585 gst_adapter_push (parse->priv->adapter, buffer);
2588 /* Parse and push as many frames as possible */
2589 /* Stop either when adapter is empty or we are flushing */
2590 while (!parse->priv->flushing) {
2593 /* note: if subclass indicates MAX fsize,
2594 * this will not likely be available anyway ... */
2595 min_size = MAX (parse->priv->min_frame_size, fsize);
2596 av = gst_adapter_available (parse->priv->adapter);
2598 if (G_UNLIKELY (parse->priv->drain)) {
2600 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2601 if (G_UNLIKELY (!min_size)) {
2606 /* Collect at least min_frame_size bytes */
2607 if (av < min_size) {
2608 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)", av);
2612 /* move along with upstream timestamp (if any),
2613 * but interpolate in between */
2614 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2615 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2616 (parse->priv->prev_ts != timestamp)) {
2617 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2620 /* always pass all available data */
2621 data = gst_adapter_map (parse->priv->adapter, av);
2622 /* arrange for actual data to be copied if subclass tries to,
2623 * since what is passed is tied to the adapter */
2624 tmpbuf = gst_buffer_new ();
2625 gst_buffer_take_memory (tmpbuf, -1,
2626 gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY |
2627 GST_MEMORY_FLAG_NO_SHARE, (gpointer) data, av, 0, av, NULL, NULL));
2629 /* keep the adapter mapped, so keep track of what has to be flushed */
2630 ret = gst_base_parse_handle_buffer (parse, tmpbuf, &skip, &flush);
2633 /* probably already implicitly unmapped due to adapter operation,
2634 * but for good measure ... */
2635 gst_adapter_unmap (parse->priv->adapter);
2636 if (ret != GST_FLOW_OK) {
2639 if (skip == 0 && flush == 0) {
2640 GST_LOG_OBJECT (parse, "nothing skipped and no frames finished, "
2641 "breaking to get more data");
2647 GST_LOG_OBJECT (parse, "chain leaving");
2651 /* pull @size bytes at current offset,
2652 * i.e. at least try to and possibly return a shorter buffer if near the end */
2653 static GstFlowReturn
2654 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2655 GstBuffer ** buffer)
2657 GstFlowReturn ret = GST_FLOW_OK;
2659 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2661 /* Caching here actually makes much less difference than one would expect.
2662 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2663 if (parse->priv->cache) {
2664 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2665 gint cache_size = gst_buffer_get_size (parse->priv->cache);
2667 if (cache_offset <= parse->priv->offset &&
2668 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2669 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
2670 parse->priv->offset - cache_offset, size);
2671 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2674 /* not enough data in the cache, free cache and get a new one */
2675 gst_buffer_unref (parse->priv->cache);
2676 parse->priv->cache = NULL;
2679 /* refill the cache */
2681 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2682 64 * 1024), &parse->priv->cache);
2683 if (ret != GST_FLOW_OK) {
2684 parse->priv->cache = NULL;
2688 if (gst_buffer_get_size (parse->priv->cache) >= size) {
2690 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
2692 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2696 /* Not possible to get enough data, try a last time with
2697 * requesting exactly the size we need */
2698 gst_buffer_unref (parse->priv->cache);
2699 parse->priv->cache = NULL;
2701 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2702 &parse->priv->cache);
2704 if (ret != GST_FLOW_OK) {
2705 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2710 if (gst_buffer_get_size (parse->priv->cache) < size) {
2711 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2712 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
2713 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
2715 *buffer = parse->priv->cache;
2716 parse->priv->cache = NULL;
2722 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
2723 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2728 static GstFlowReturn
2729 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2732 GstClockTime ts = 0;
2736 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2737 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2738 parse->priv->last_offset);
2740 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2741 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2742 GST_TIME_ARGS (parse->segment.start));
2747 /* last fragment started at last_offset / last_ts;
2748 * seek back 10s capped at 1MB */
2749 if (parse->priv->last_ts >= 10 * GST_SECOND)
2750 ts = parse->priv->last_ts - 10 * GST_SECOND;
2751 /* if we are exact now, we will be more so going backwards */
2752 if (parse->priv->exact_position) {
2753 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2755 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2756 GST_FORMAT_BYTES, &offset)) {
2757 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2760 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2761 parse->priv->last_offset - 1024);
2762 offset = MAX (0, offset);
2764 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2766 parse->priv->offset = offset;
2768 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2770 if (ret != GST_FLOW_OK)
2773 /* offset will increase again as fragment is processed/parsed */
2774 parse->priv->last_offset = offset;
2776 gst_base_parse_start_fragment (parse);
2777 gst_adapter_push (parse->priv->adapter, buffer);
2778 ret = gst_base_parse_finish_fragment (parse, TRUE);
2779 if (ret != GST_FLOW_OK)
2782 /* force previous fragment */
2783 parse->priv->offset = -1;
2790 * pull and scan for next frame starting from current offset
2791 * ajusts sync, drain and offset going along */
2792 static GstFlowReturn
2793 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2797 GstFlowReturn ret = GST_FLOW_OK;
2798 guint fsize, min_size;
2802 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2803 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2805 /* let's make this efficient for all subclass once and for all;
2806 * maybe it does not need this much, but in the latter case, we know we are
2807 * in pull mode here and might as well try to read and supply more anyway
2808 * (so does the buffer caching mechanism) */
2812 min_size = MAX (parse->priv->min_frame_size, fsize);
2814 GST_LOG_OBJECT (parse, "reading buffer size %u", min_size);
2816 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2817 if (ret != GST_FLOW_OK)
2820 /* if we got a short read, inform subclass we are draining leftover
2821 * and no more is to be expected */
2822 if (gst_buffer_get_size (buffer) < min_size) {
2823 GST_LOG_OBJECT (parse, "... but did not get that; marked draining");
2824 parse->priv->drain = TRUE;
2827 if (parse->priv->detecting) {
2828 ret = klass->detect (parse, buffer);
2829 if (ret == GST_FLOW_NOT_NEGOTIATED) {
2830 /* If draining we error out, otherwise request a buffer
2832 if (parse->priv->drain) {
2833 gst_buffer_unref (buffer);
2834 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
2835 return GST_FLOW_ERROR;
2838 gst_buffer_unref (buffer);
2841 } else if (ret != GST_FLOW_OK) {
2842 gst_buffer_unref (buffer);
2843 GST_ERROR_OBJECT (parse, "detect() returned %s",
2844 gst_flow_get_name (ret));
2848 /* Else handle this buffer normally */
2851 ret = gst_base_parse_handle_buffer (parse, buffer, &skip, &flushed);
2852 if (ret != GST_FLOW_OK)
2855 /* something flushed means something happened,
2856 * and we should bail out of this loop so as not to occupy
2857 * the task thread indefinitely */
2859 GST_LOG_OBJECT (parse, "frame finished, breaking loop");
2862 /* nothing flushed, no skip and draining, so nothing left to do */
2863 if (!skip && parse->priv->drain) {
2864 GST_LOG_OBJECT (parse, "no activity or result when draining; "
2865 "breaking loop and marking EOS");
2869 /* otherwise, get some more data
2870 * note that is checked this does not happen indefinitely */
2872 GST_LOG_OBJECT (parse, "getting some more data");
2875 parse->priv->drain = FALSE;
2882 /* Loop that is used in pull mode to retrieve data from upstream */
2884 gst_base_parse_loop (GstPad * pad)
2886 GstBaseParse *parse;
2887 GstBaseParseClass *klass;
2888 GstFlowReturn ret = GST_FLOW_OK;
2890 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2891 klass = GST_BASE_PARSE_GET_CLASS (parse);
2893 /* reverse playback:
2894 * first fragment (closest to stop time) is handled normally below,
2895 * then we pull in fragments going backwards */
2896 if (parse->segment.rate < 0.0) {
2897 /* check if we jumped back to a previous fragment,
2898 * which is a post-first fragment */
2899 if (parse->priv->offset < 0) {
2900 ret = gst_base_parse_handle_previous_fragment (parse);
2905 ret = gst_base_parse_scan_frame (parse, klass, TRUE);
2906 if (ret != GST_FLOW_OK)
2909 /* eat expected eos signalling past segment in reverse playback */
2910 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
2911 parse->segment.position >= parse->segment.stop) {
2912 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2913 /* push what was accumulated during loop run */
2914 gst_base_parse_finish_fragment (parse, FALSE);
2915 /* force previous fragment */
2916 parse->priv->offset = -1;
2921 if (ret == GST_FLOW_EOS)
2923 else if (ret != GST_FLOW_OK)
2926 gst_object_unref (parse);
2933 GST_DEBUG_OBJECT (parse, "eos");
2938 gboolean push_eos = FALSE;
2940 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2941 gst_flow_get_name (ret));
2942 gst_pad_pause_task (parse->sinkpad);
2944 if (ret == GST_FLOW_EOS) {
2945 /* handle end-of-stream/segment */
2946 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2949 if ((stop = parse->segment.stop) == -1)
2950 stop = parse->segment.duration;
2952 GST_DEBUG_OBJECT (parse, "sending segment_done");
2954 gst_element_post_message
2955 (GST_ELEMENT_CAST (parse),
2956 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2957 GST_FORMAT_TIME, stop));
2959 /* If we STILL have zero frames processed, fire an error */
2960 if (parse->priv->framecount == 0) {
2961 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2962 ("No valid frames found before end of stream"), (NULL));
2966 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
2967 /* for fatal errors we post an error message, wrong-state is
2968 * not fatal because it happens due to flushes and only means
2969 * that we should stop now. */
2970 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2971 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
2975 /* newsegment before eos */
2976 if (parse->priv->pending_segment) {
2977 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
2978 parse->priv->pending_segment = NULL;
2980 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
2982 gst_object_unref (parse);
2987 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
2989 GstBaseParse *parse;
2993 parse = GST_BASE_PARSE (parent);
2995 GST_DEBUG_OBJECT (parse, "sink activate");
2997 query = gst_query_new_scheduling ();
2998 if (!gst_pad_peer_query (sinkpad, query)) {
2999 gst_query_unref (query);
3000 goto baseparse_push;
3003 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL);
3004 gst_query_unref (query);
3007 goto baseparse_push;
3009 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
3010 if (!gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE))
3011 goto baseparse_push;
3013 return gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop,
3018 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
3019 return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
3024 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
3026 GstBaseParseClass *klass;
3027 gboolean result = TRUE;
3029 GST_DEBUG_OBJECT (parse, "activate %d", active);
3031 klass = GST_BASE_PARSE_GET_CLASS (parse);
3034 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
3035 result = klass->start (parse);
3037 /* If the subclass implements ::detect we want to
3038 * call it for the first buffers now */
3039 parse->priv->detecting = (klass->detect != NULL);
3041 /* We must make sure streaming has finished before resetting things
3042 * and calling the ::stop vfunc */
3043 GST_PAD_STREAM_LOCK (parse->sinkpad);
3044 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3046 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
3047 result = klass->stop (parse);
3049 parse->priv->pad_mode = GST_PAD_MODE_NONE;
3051 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
3056 gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
3057 GstPadMode mode, gboolean active)
3060 GstBaseParse *parse;
3062 parse = GST_BASE_PARSE (parent);
3064 GST_DEBUG_OBJECT (parse, "sink activate mode %d, %d", mode, active);
3066 if (!gst_base_parse_activate (parse, active))
3067 goto activate_failed;
3070 case GST_PAD_MODE_PULL:
3072 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
3075 result = gst_pad_stop_task (pad);
3083 parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
3085 GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
3092 GST_DEBUG_OBJECT (parse, "activate failed");
3098 * gst_base_parse_set_duration:
3099 * @parse: #GstBaseParse.
3101 * @duration: duration value.
3102 * @interval: how often to update the duration estimate based on bitrate, or 0.
3104 * Sets the duration of the currently playing media. Subclass can use this
3105 * when it is able to determine duration and/or notices a change in the media
3106 * duration. Alternatively, if @interval is non-zero (default), then stream
3107 * duration is determined based on estimated bitrate, and updated every @interval
3113 gst_base_parse_set_duration (GstBaseParse * parse,
3114 GstFormat fmt, gint64 duration, gint interval)
3116 g_return_if_fail (parse != NULL);
3118 if (parse->priv->upstream_has_duration) {
3119 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3123 if (duration != parse->priv->duration) {
3126 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
3127 gst_element_post_message (GST_ELEMENT (parse), m);
3129 /* TODO: what about duration tag? */
3131 parse->priv->duration = duration;
3132 parse->priv->duration_fmt = fmt;
3133 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3134 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3135 if (interval != 0) {
3136 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3140 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3141 parse->priv->update_interval = interval;
3147 * gst_base_parse_set_average_bitrate:
3148 * @parse: #GstBaseParse.
3149 * @bitrate: average bitrate in bits/second
3151 * Optionally sets the average bitrate detected in media (if non-zero),
3152 * e.g. based on metadata, as it will be posted to the application.
3154 * By default, announced average bitrate is estimated. The average bitrate
3155 * is used to estimate the total duration of the stream and to estimate
3156 * a seek position, if there's no index and the format is syncable
3157 * (see gst_base_parse_set_syncable()).
3162 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3164 parse->priv->bitrate = bitrate;
3165 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3169 * gst_base_parse_set_min_frame_size:
3170 * @parse: #GstBaseParse.
3171 * @min_size: Minimum size of the data that this base class should give to
3174 * Subclass can use this function to tell the base class that it needs to
3175 * give at least #min_size buffers.
3180 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3182 g_return_if_fail (parse != NULL);
3184 parse->priv->min_frame_size = min_size;
3185 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3189 * gst_base_parse_set_frame_rate:
3190 * @parse: the #GstBaseParse to set
3191 * @fps_num: frames per second (numerator).
3192 * @fps_den: frames per second (denominator).
3193 * @lead_in: frames needed before a segment for subsequent decode
3194 * @lead_out: frames needed after a segment
3196 * If frames per second is configured, parser can take care of buffer duration
3197 * and timestamping. When performing segment clipping, or seeking to a specific
3198 * location, a corresponding decoder might need an initial @lead_in and a
3199 * following @lead_out number of frames to ensure the desired segment is
3200 * entirely filled upon decoding.
3205 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3206 guint fps_den, guint lead_in, guint lead_out)
3208 g_return_if_fail (parse != NULL);
3210 parse->priv->fps_num = fps_num;
3211 parse->priv->fps_den = fps_den;
3212 if (!fps_num || !fps_den) {
3213 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3215 fps_num = fps_den = 0;
3216 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3217 parse->priv->lead_in = parse->priv->lead_out = 0;
3218 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3220 parse->priv->frame_duration =
3221 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3222 parse->priv->lead_in = lead_in;
3223 parse->priv->lead_out = lead_out;
3224 parse->priv->lead_in_ts =
3225 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3226 parse->priv->lead_out_ts =
3227 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3228 /* aim for about 1.5s to estimate duration */
3229 if (parse->priv->update_interval < 0) {
3230 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3231 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3232 parse->priv->update_interval);
3235 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3236 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3237 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3238 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3239 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3240 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3244 * gst_base_parse_set_has_timing_info:
3245 * @parse: a #GstBaseParse
3246 * @has_timing: whether frames carry timing information
3248 * Set if frames carry timing information which the subclass can (generally)
3249 * parse and provide. In particular, intrinsic (rather than estimated) time
3250 * can be obtained following a seek.
3255 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3257 parse->priv->has_timing_info = has_timing;
3258 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3262 * gst_base_parse_set_syncable:
3263 * @parse: a #GstBaseParse
3264 * @syncable: set if frame starts can be identified
3266 * Set if frame starts can be identified. This is set by default and
3267 * determines whether seeking based on bitrate averages
3268 * is possible for a format/stream.
3273 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3275 parse->priv->syncable = syncable;
3276 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3280 * gst_base_parse_set_passthrough:
3281 * @parse: a #GstBaseParse
3282 * @passthrough: %TRUE if parser should run in passthrough mode
3284 * Set if the nature of the format or configuration does not allow (much)
3285 * parsing, and the parser should operate in passthrough mode (which only
3286 * applies when operating in push mode). That is, incoming buffers are
3287 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3288 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3289 * so subclass can perform as much or as little is appropriate for
3290 * passthrough semantics in @pre_push_frame.
3295 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3297 parse->priv->passthrough = passthrough;
3298 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3302 * gst_base_parse_set_latency:
3303 * @parse: a #GstBaseParse
3304 * @min_latency: minimum parse latency
3305 * @max_latency: maximum parse latency
3307 * Sets the minimum and maximum (which may likely be equal) latency introduced
3308 * by the parsing process. If there is such a latency, which depends on the
3309 * particular parsing of the format, it typically corresponds to 1 frame duration.
3314 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3315 GstClockTime max_latency)
3317 GST_OBJECT_LOCK (parse);
3318 parse->priv->min_latency = min_latency;
3319 parse->priv->max_latency = max_latency;
3320 GST_OBJECT_UNLOCK (parse);
3321 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3322 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3323 GST_TIME_ARGS (max_latency));
3327 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3328 GstClockTime * duration)
3330 gboolean res = FALSE;
3332 g_return_val_if_fail (duration != NULL, FALSE);
3334 *duration = GST_CLOCK_TIME_NONE;
3335 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3336 GST_LOG_OBJECT (parse, "using provided duration");
3337 *duration = parse->priv->duration;
3339 } else if (parse->priv->duration != -1) {
3340 GST_LOG_OBJECT (parse, "converting provided duration");
3341 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3342 parse->priv->duration, format, (gint64 *) duration);
3343 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3344 GST_LOG_OBJECT (parse, "using estimated duration");
3345 *duration = parse->priv->estimated_duration;
3348 GST_LOG_OBJECT (parse, "cannot estimate duration");
3351 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3352 GST_TIME_ARGS (*duration));
3357 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
3359 GstBaseParse *parse;
3360 gboolean res = FALSE;
3362 parse = GST_BASE_PARSE (parent);
3364 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3366 switch (GST_QUERY_TYPE (query)) {
3367 case GST_QUERY_POSITION:
3372 GST_DEBUG_OBJECT (parse, "position query");
3373 gst_query_parse_position (query, &format, NULL);
3375 /* try upstream first */
3376 res = gst_pad_query_default (pad, parent, query);
3378 /* Fall back on interpreting segment */
3379 GST_OBJECT_LOCK (parse);
3380 if (format == GST_FORMAT_BYTES) {
3381 dest_value = parse->priv->offset;
3383 } else if (format == parse->segment.format &&
3384 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
3385 dest_value = gst_segment_to_stream_time (&parse->segment,
3386 parse->segment.format, parse->segment.position);
3389 GST_OBJECT_UNLOCK (parse);
3391 /* no precise result, upstream no idea either, then best estimate */
3392 /* priv->offset is updated in both PUSH/PULL modes */
3393 res = gst_base_parse_convert (parse,
3394 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3397 gst_query_set_position (query, format, dest_value);
3401 case GST_QUERY_DURATION:
3404 GstClockTime duration;
3406 GST_DEBUG_OBJECT (parse, "duration query");
3407 gst_query_parse_duration (query, &format, NULL);
3409 /* consult upstream */
3410 res = gst_pad_query_default (pad, parent, query);
3412 /* otherwise best estimate from us */
3414 res = gst_base_parse_get_duration (parse, format, &duration);
3416 gst_query_set_duration (query, format, duration);
3420 case GST_QUERY_SEEKING:
3423 GstClockTime duration = GST_CLOCK_TIME_NONE;
3424 gboolean seekable = FALSE;
3426 GST_DEBUG_OBJECT (parse, "seeking query");
3427 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3429 /* consult upstream */
3430 res = gst_pad_query_default (pad, parent, query);
3432 /* we may be able to help if in TIME */
3433 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3434 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3435 /* already OK if upstream takes care */
3436 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3438 if (!(res && seekable)) {
3439 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3440 || duration == -1) {
3441 /* seekable if we still have a chance to get duration later on */
3443 parse->priv->upstream_seekable && parse->priv->update_interval;
3445 seekable = parse->priv->upstream_seekable;
3446 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3449 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3455 case GST_QUERY_FORMATS:
3456 gst_query_set_formatsv (query, 3, fmtlist);
3459 case GST_QUERY_CONVERT:
3461 GstFormat src_format, dest_format;
3462 gint64 src_value, dest_value;
3464 gst_query_parse_convert (query, &src_format, &src_value,
3465 &dest_format, &dest_value);
3467 res = gst_base_parse_convert (parse, src_format, src_value,
3468 dest_format, &dest_value);
3470 gst_query_set_convert (query, src_format, src_value,
3471 dest_format, dest_value);
3475 case GST_QUERY_LATENCY:
3477 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3479 GstClockTime min_latency, max_latency;
3481 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3482 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3483 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3484 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3486 GST_OBJECT_LOCK (parse);
3487 /* add our latency */
3488 if (min_latency != -1)
3489 min_latency += parse->priv->min_latency;
3490 if (max_latency != -1)
3491 max_latency += parse->priv->max_latency;
3492 GST_OBJECT_UNLOCK (parse);
3494 gst_query_set_latency (query, live, min_latency, max_latency);
3499 res = gst_pad_query_default (pad, parent, query);
3505 /* scans for a cluster start from @pos,
3506 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3507 static GstFlowReturn
3508 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3509 GstClockTime * time, GstClockTime * duration)
3511 GstBaseParseClass *klass;
3513 gboolean orig_drain, orig_discont;
3514 GstFlowReturn ret = GST_FLOW_OK;
3515 GstBuffer *buf = NULL;
3516 GstBaseParseFrame *sframe = NULL;
3518 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3519 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3520 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3522 klass = GST_BASE_PARSE_GET_CLASS (parse);
3524 *time = GST_CLOCK_TIME_NONE;
3525 *duration = GST_CLOCK_TIME_NONE;
3528 orig_offset = parse->priv->offset;
3529 orig_discont = parse->priv->discont;
3530 orig_drain = parse->priv->drain;
3532 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3533 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3535 /* jump elsewhere and locate next frame */
3536 parse->priv->offset = *pos;
3537 /* mark as scanning so frames don't get processed all the way */
3538 parse->priv->scanning = TRUE;
3539 ret = gst_base_parse_scan_frame (parse, klass, FALSE);
3540 parse->priv->scanning = FALSE;
3541 /* retrieve frame found during scan */
3542 sframe = parse->priv->scanned_frame;
3543 parse->priv->scanned_frame = NULL;
3545 if (ret != GST_FLOW_OK || !sframe)
3548 /* get offset first, subclass parsing might dump other stuff in there */
3549 *pos = sframe->offset;
3550 buf = sframe->buffer;
3553 /* but it should provide proper time */
3554 *time = GST_BUFFER_TIMESTAMP (buf);
3555 *duration = GST_BUFFER_DURATION (buf);
3557 GST_LOG_OBJECT (parse,
3558 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3559 GST_TIME_ARGS (*time), *pos);
3563 gst_base_parse_frame_free (sframe);
3566 parse->priv->offset = orig_offset;
3567 parse->priv->discont = orig_discont;
3568 parse->priv->drain = orig_drain;
3573 /* bisect and scan through file for frame starting before @time,
3574 * returns OK and @time/@offset if found, NONE and/or error otherwise
3575 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3576 static GstFlowReturn
3577 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3580 GstFlowReturn ret = GST_FLOW_OK;
3581 gint64 lpos, hpos, newpos;
3582 GstClockTime time, ltime, htime, newtime, dur;
3583 gboolean cont = TRUE;
3584 const GstClockTime tolerance = TARGET_DIFFERENCE;
3585 const guint chunk = 4 * 1024;
3587 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3588 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3590 GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
3591 GST_TIME_ARGS (*_time));
3593 /* TODO also make keyframe aware if useful some day */
3608 /* do not know at first */
3610 *_time = GST_CLOCK_TIME_NONE;
3612 /* need initial positions; start and end */
3613 lpos = parse->priv->first_frame_offset;
3614 ltime = parse->priv->first_frame_ts;
3615 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
3616 GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
3617 return GST_FLOW_ERROR;
3619 hpos = parse->priv->upstream_size;
3621 GST_DEBUG_OBJECT (parse,
3622 "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
3623 ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, htime,
3624 GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
3626 /* check preconditions are satisfied;
3627 * start and end are needed, except for special case where we scan for
3628 * last frame to determine duration */
3629 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
3630 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3631 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3635 /* shortcut cases */
3638 } else if (time < ltime + tolerance) {
3642 } else if (time >= htime) {
3648 while (htime > ltime && cont) {
3649 GST_LOG_OBJECT (parse,
3650 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3651 GST_TIME_ARGS (ltime));
3652 GST_LOG_OBJECT (parse,
3653 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3654 GST_TIME_ARGS (htime));
3655 if (G_UNLIKELY (time == G_MAXINT64)) {
3657 } else if (G_LIKELY (hpos > lpos)) {
3659 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3662 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3664 /* we check this case once, but not forever, so break loop */
3669 newpos = CLAMP (newpos, lpos, hpos);
3670 GST_LOG_OBJECT (parse,
3671 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3672 GST_TIME_ARGS (time), newpos);
3674 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3675 if (ret == GST_FLOW_EOS) {
3676 /* heuristic HACK */
3677 hpos = MAX (lpos, hpos - chunk);
3679 } else if (ret != GST_FLOW_OK) {
3683 if (newtime == -1 || newpos == -1) {
3684 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3688 if (G_UNLIKELY (time == G_MAXINT64)) {
3691 if (GST_CLOCK_TIME_IS_VALID (dur))
3694 } else if (newtime > time) {
3696 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3698 } else if (newtime + tolerance > time) {
3699 /* close enough undershoot */
3703 } else if (newtime < ltime) {
3704 /* so a position beyond lpos resulted in earlier time than ltime ... */
3705 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3708 /* undershoot too far */
3709 newpos += newpos == lpos ? chunk : 0;
3710 lpos = CLAMP (newpos, lpos, hpos);
3716 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3717 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3722 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3723 gboolean before, GstClockTime * _ts)
3725 gint64 bytes = 0, ts = 0;
3726 GstIndexEntry *entry = NULL;
3728 if (time == GST_CLOCK_TIME_NONE) {
3734 GST_BASE_PARSE_INDEX_LOCK (parse);
3735 if (parse->priv->index) {
3736 /* Let's check if we have an index entry for that time */
3737 entry = gst_index_get_assoc_entry (parse->priv->index,
3738 parse->priv->index_id,
3739 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3740 GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3744 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3745 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3747 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3748 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3749 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3751 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3752 GST_TIME_ARGS (time));
3755 ts = GST_CLOCK_TIME_NONE;
3758 GST_BASE_PARSE_INDEX_UNLOCK (parse);
3767 /* returns TRUE if seek succeeded */
3769 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3774 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3775 gboolean flush, update, res = TRUE, accurate;
3776 gint64 cur, stop, seekpos, seekstop;
3777 GstSegment seeksegment = { 0, };
3778 GstClockTime start_ts;
3780 gst_event_parse_seek (event, &rate, &format, &flags,
3781 &cur_type, &cur, &stop_type, &stop);
3783 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3784 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3785 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3786 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3788 /* no negative rates in push mode */
3789 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
3792 if (cur_type != GST_SEEK_TYPE_SET ||
3793 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3796 /* For any format other than TIME, see if upstream handles
3797 * it directly or fail. For TIME, try upstream, but do it ourselves if
3798 * it fails upstream */
3799 res = gst_pad_push_event (parse->sinkpad, event);
3800 if (format != GST_FORMAT_TIME || res)
3803 /* get flush flag */
3804 flush = flags & GST_SEEK_FLAG_FLUSH;
3806 /* copy segment, we need this because we still need the old
3807 * segment when we close the current segment. */
3808 gst_segment_copy_into (&parse->segment, &seeksegment);
3810 GST_DEBUG_OBJECT (parse, "configuring seek");
3811 gst_segment_do_seek (&seeksegment, rate, format, flags,
3812 cur_type, cur, stop_type, stop, &update);
3814 /* accurate seeking implies seek tables are used to obtain position,
3815 * and the requested segment is maintained exactly, not adjusted any way */
3816 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3818 /* maybe we can be accurate for (almost) free */
3819 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
3820 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
3821 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3825 GstClockTime startpos = seeksegment.position;
3827 /* accurate requested, so ... seek a bit before target */
3828 if (startpos < parse->priv->lead_in_ts)
3831 startpos -= parse->priv->lead_in_ts;
3832 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3833 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3836 start_ts = seeksegment.position;
3837 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.position,
3838 GST_FORMAT_BYTES, &seekpos))
3839 goto convert_failed;
3840 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3841 GST_FORMAT_BYTES, &seekstop))
3842 goto convert_failed;
3845 GST_DEBUG_OBJECT (parse,
3846 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3848 GST_DEBUG_OBJECT (parse,
3849 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3850 seeksegment.stop, seekstop);
3852 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
3855 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3858 if (parse->srcpad) {
3859 GST_DEBUG_OBJECT (parse, "sending flush start");
3860 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3861 /* unlock upstream pull_range */
3862 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3865 gst_pad_pause_task (parse->sinkpad);
3868 /* we should now be able to grab the streaming thread because we stopped it
3869 * with the above flush/pause code */
3870 GST_PAD_STREAM_LOCK (parse->sinkpad);
3872 /* save current position */
3873 last_stop = parse->segment.position;
3874 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3877 /* now commit to new position */
3879 /* prepare for streaming again */
3881 GST_DEBUG_OBJECT (parse, "sending flush stop");
3882 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop (TRUE));
3883 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop (TRUE));
3884 gst_base_parse_clear_queues (parse);
3886 /* keep track of our position */
3887 seeksegment.base = gst_segment_to_running_time (&seeksegment,
3888 seeksegment.format, parse->segment.position);
3891 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3893 /* store the newsegment event so it can be sent from the streaming thread. */
3894 if (parse->priv->pending_segment)
3895 gst_event_unref (parse->priv->pending_segment);
3897 /* This will be sent later in _loop() */
3898 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
3900 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3901 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3902 ", pos = %" GST_TIME_FORMAT, format,
3903 GST_TIME_ARGS (parse->segment.start),
3904 GST_TIME_ARGS (parse->segment.stop),
3905 GST_TIME_ARGS (parse->segment.start));
3907 /* one last chance in pull mode to stay accurate;
3908 * maybe scan and subclass can find where to go */
3911 GstClockTime ts = seeksegment.position;
3913 gst_base_parse_locate_time (parse, &ts, &scanpos);
3917 /* running collected index now consists of several intervals,
3918 * so optimized check no longer possible */
3919 parse->priv->index_last_valid = FALSE;
3920 parse->priv->index_last_offset = 0;
3921 parse->priv->index_last_ts = 0;
3925 /* mark discont if we are going to stream from another position. */
3926 if (seekpos != parse->priv->offset) {
3927 GST_DEBUG_OBJECT (parse,
3928 "mark DISCONT, we did a seek to another position");
3929 parse->priv->offset = seekpos;
3930 parse->priv->last_offset = seekpos;
3931 parse->priv->seen_keyframe = FALSE;
3932 parse->priv->discont = TRUE;
3933 parse->priv->next_ts = start_ts;
3934 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3935 parse->priv->sync_offset = seekpos;
3936 parse->priv->exact_position = accurate;
3939 /* Start streaming thread if paused */
3940 gst_pad_start_task (parse->sinkpad,
3941 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3943 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3948 GstEvent *new_event;
3949 GstBaseParseSeek *seek;
3950 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
3952 /* The only thing we need to do in PUSH-mode is to send the
3953 seek event (in bytes) to upstream. Segment / flush handling happens
3954 in corresponding src event handlers */
3955 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3956 if (seekstop >= 0 && seekstop <= seekpos)
3958 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
3959 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3961 /* store segment info so its precise details can be reconstructed when
3962 * receiving newsegment;
3963 * this matters for all details when accurate seeking,
3964 * is most useful to preserve NONE stop time otherwise */
3965 seek = g_new0 (GstBaseParseSeek, 1);
3966 seek->segment = seeksegment;
3967 seek->accurate = accurate;
3968 seek->offset = seekpos;
3969 seek->start_ts = start_ts;
3970 GST_OBJECT_LOCK (parse);
3971 /* less optimal, but preserves order */
3972 parse->priv->pending_seeks =
3973 g_slist_append (parse->priv->pending_seeks, seek);
3974 GST_OBJECT_UNLOCK (parse);
3976 res = gst_pad_push_event (parse->sinkpad, new_event);
3979 GST_OBJECT_LOCK (parse);
3980 parse->priv->pending_seeks =
3981 g_slist_remove (parse->priv->pending_seeks, seek);
3982 GST_OBJECT_UNLOCK (parse);
3993 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
3999 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
4005 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
4011 /* Checks if bitrates are available from upstream tags so that we don't
4012 * override them later
4015 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
4017 GstTagList *taglist = NULL;
4020 gst_event_parse_tag (event, &taglist);
4022 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
4023 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
4024 parse->priv->post_min_bitrate = FALSE;
4026 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
4027 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
4028 parse->priv->post_avg_bitrate = FALSE;
4030 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
4031 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
4032 parse->priv->post_max_bitrate = FALSE;
4038 gst_base_parse_set_index (GstElement * element, GstIndex * index)
4040 GstBaseParse *parse = GST_BASE_PARSE (element);
4042 GST_BASE_PARSE_INDEX_LOCK (parse);
4043 if (parse->priv->index)
4044 gst_object_unref (parse->priv->index);
4046 parse->priv->index = gst_object_ref (index);
4047 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4048 &parse->priv->index_id);
4049 parse->priv->own_index = FALSE;
4051 parse->priv->index = NULL;
4053 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4057 gst_base_parse_get_index (GstElement * element)
4059 GstBaseParse *parse = GST_BASE_PARSE (element);
4060 GstIndex *result = NULL;
4062 GST_BASE_PARSE_INDEX_LOCK (parse);
4063 if (parse->priv->index)
4064 result = gst_object_ref (parse->priv->index);
4065 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4071 static GstStateChangeReturn
4072 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4074 GstBaseParse *parse;
4075 GstStateChangeReturn result;
4077 parse = GST_BASE_PARSE (element);
4079 switch (transition) {
4080 case GST_STATE_CHANGE_READY_TO_PAUSED:
4081 /* If this is our own index destroy it as the
4082 * old entries might be wrong for the new stream */
4083 GST_BASE_PARSE_INDEX_LOCK (parse);
4084 if (parse->priv->own_index) {
4085 gst_object_unref (parse->priv->index);
4086 parse->priv->index = NULL;
4087 parse->priv->own_index = FALSE;
4090 /* If no index was created, generate one */
4091 if (G_UNLIKELY (!parse->priv->index)) {
4092 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4094 parse->priv->index = g_object_new (gst_mem_index_get_type (), NULL);
4095 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4096 &parse->priv->index_id);
4097 parse->priv->own_index = TRUE;
4099 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4105 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4107 switch (transition) {
4108 case GST_STATE_CHANGE_PAUSED_TO_READY:
4109 gst_base_parse_reset (parse);