2 * Copyright (C) 2008 Nokia Corporation. All rights reserved.
3 * Contact: Stefan Kost <stefan.kost@nokia.com>
4 * Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
5 * Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
6 * Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
25 * SECTION:gstbaseparse
26 * @short_description: Base class for stream parsers
27 * @see_also: #GstBaseTransform
29 * This base class is for parser elements that process data and splits it
30 * into separate audio/video/whatever frames.
34 * <listitem><para>provides one sink pad and one source pad</para></listitem>
35 * <listitem><para>handles state changes</para></listitem>
36 * <listitem><para>can operate in pull mode or push mode</para></listitem>
37 * <listitem><para>handles seeking in both modes</para></listitem>
38 * <listitem><para>handles events (NEWSEGMENT/EOS/FLUSH)</para></listitem>
40 * handles queries (POSITION/DURATION/SEEKING/FORMAT/CONVERT)
42 * <listitem><para>handles flushing</para></listitem>
45 * The purpose of this base class is to provide the basic functionality of
46 * a parser and share a lot of rather complex code.
48 * Description of the parsing mechanism:
51 * <itemizedlist><title>Set-up phase</title>
53 * GstBaseParse class calls @set_sink_caps to inform the subclass about
54 * incoming sinkpad caps. Subclass should set the srcpad caps accordingly.
57 * GstBaseParse calls @start to inform subclass that data processing is
61 * At least at this point subclass needs to tell the GstBaseParse class
62 * how big data chunks it wants to receive (min_frame_size). It can do
63 * this with gst_base_parse_set_min_frame_size().
66 * GstBaseParse class sets up appropriate data passing mode (pull/push)
67 * and starts to process the data.
73 * <title>Parsing phase</title>
75 * GstBaseParse gathers at least min_frame_size bytes of data either
76 * by pulling it from upstream or collecting buffers in an internal
80 * A buffer of (at least) min_frame_size bytes is passed to subclass with
81 * @check_valid_frame. Subclass checks the contents and returns TRUE
82 * if the buffer contains a valid frame. It also needs to set the
83 * @framesize according to the detected frame size. If buffer didn't
84 * contain a valid frame, this call must return FALSE and optionally
85 * set the @skipsize value to inform base class that how many bytes
86 * it needs to skip in order to find a valid frame. @framesize can always
87 * indicate a new minimum for current frame parsing. Indicating G_MAXUINT
88 * for requested amount means subclass simply needs best available
89 * subsequent data. In push mode this amounts to an additional input buffer
90 * (thus minimal additional latency), in pull mode this amounts to some
91 * arbitrary reasonable buffer size increase. The passed buffer
92 * is read-only. Note that @check_valid_frame might receive any small
93 * amount of input data when leftover data is being drained (e.g. at EOS).
96 * After valid frame is found, it will be passed again to subclass with
97 * @parse_frame call. Now subclass is responsible for parsing the
98 * frame contents and setting the caps, and buffer metadata (e.g.
99 * buffer timestamp and duration, or keyframe if applicable).
100 * (although the latter can also be done by GstBaseParse if it is
101 * appropriately configured, see below). Frame is provided with
102 * timestamp derived from upstream (as much as generally possible),
103 * duration obtained from configuration (see below), and offset
104 * if meaningful (in pull mode).
107 * Finally the buffer can be pushed downstream and the parsing loop starts
108 * over again. Just prior to actually pushing the buffer in question,
109 * it is passed to @pre_push_frame which gives subclass yet one
110 * last chance to examine buffer metadata, or to send some custom (tag)
111 * events, or to perform custom (segment) filtering.
114 * During the parsing process GstBaseParseClass will handle both srcpad
115 * and sinkpad events. They will be passed to subclass if @event or
116 * @src_event callbacks have been provided.
121 * <itemizedlist><title>Shutdown phase</title>
123 * GstBaseParse class calls @stop to inform the subclass that data
124 * parsing will be stopped.
130 * Subclass is responsible for providing pad template caps for
131 * source and sink pads. The pads need to be named "sink" and "src". It also
132 * needs to set the fixed caps on srcpad, when the format is ensured (e.g.
133 * when base class calls subclass' @set_sink_caps function).
135 * This base class uses #GST_FORMAT_DEFAULT as a meaning of frames. So,
136 * subclass conversion routine needs to know that conversion from
137 * #GST_FORMAT_TIME to #GST_FORMAT_DEFAULT must return the
138 * frame number that can be found from the given byte position.
140 * GstBaseParse uses subclasses conversion methods also for seeking (or
141 * otherwise uses its own default one, see also below).
143 * Subclass @start and @stop functions will be called to inform the beginning
144 * and end of data processing.
146 * Things that subclass need to take care of:
148 * <listitem><para>Provide pad templates</para></listitem>
150 * Fixate the source pad caps when appropriate
153 * Inform base class how big data chunks should be retrieved. This is
154 * done with gst_base_parse_set_min_frame_size() function.
157 * Examine data chunks passed to subclass with @check_valid_frame
158 * and tell if they contain a valid frame
161 * Set the caps and timestamp to frame that is passed to subclass with
162 * @parse_frame function.
164 * <listitem><para>Provide conversion functions</para></listitem>
166 * Update the duration information with gst_base_parse_set_duration()
169 * Optionally passthrough using gst_base_parse_set_passthrough()
172 * Configure various baseparse parameters using
173 * gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
174 * and gst_base_parse_set_frame_rate().
177 * In particular, if subclass is unable to determine a duration, but
178 * parsing (or specs) yields a frames per seconds rate, then this can be
179 * provided to GstBaseParse to enable it to cater for
180 * buffer time metadata (which will be taken from upstream as much as
181 * possible). Internally keeping track of frame durations and respective
182 * sizes that have been pushed provides GstBaseParse with an estimated
183 * bitrate. A default @convert (used if not overriden) will then use these
184 * rates to perform obvious conversions. These rates are also used to
185 * update (estimated) duration at regular frame intervals.
192 * - In push mode provide a queue of adapter-"queued" buffers for upstream
194 * - Queue buffers/events until caps are set
204 /* FIXME 0.11: suppress warnings for deprecated API such as GStaticRecMutex
205 * with newer GLib versions (>= 2.31.0) */
206 #define GLIB_DISABLE_DEPRECATION_WARNINGS
207 #include <gst/base/gstadapter.h>
209 #include "gstbaseparse.h"
211 #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
213 #define MIN_FRAMES_TO_POST_BITRATE 10
214 #define TARGET_DIFFERENCE (20 * GST_SECOND)
216 GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
217 #define GST_CAT_DEFAULT gst_base_parse_debug
219 /* Supported formats */
220 static const GstFormat fmtlist[] = {
227 #define GST_BASE_PARSE_GET_PRIVATE(obj) \
228 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
230 struct _GstBaseParsePrivate
237 GstFormat duration_fmt;
238 gint64 estimated_duration;
239 gint64 estimated_drift;
241 guint min_frame_size;
242 gboolean passthrough;
244 gboolean has_timing_info;
245 guint fps_num, fps_den;
246 gint update_interval;
248 guint lead_in, lead_out;
249 GstClockTime lead_in_ts, lead_out_ts;
250 GstClockTime min_latency, max_latency;
258 GstClockTime next_ts;
259 GstClockTime prev_ts;
260 GstClockTime frame_duration;
261 gboolean seen_keyframe;
266 guint64 data_bytecount;
267 guint64 acc_duration;
268 GstClockTime first_frame_ts;
269 gint64 first_frame_offset;
271 gboolean post_min_bitrate;
272 gboolean post_avg_bitrate;
273 gboolean post_max_bitrate;
277 guint posted_avg_bitrate;
279 GList *pending_events;
281 /* frames/buffers that are queued and ready to go on OK */
282 GQueue queued_frames;
286 /* index entry storage, either ours or provided */
290 #if !GLIB_CHECK_VERSION (2, 31, 0)
291 GStaticMutex index_lock;
296 /* seek table entries only maintained if upstream is BYTE seekable */
297 gboolean upstream_seekable;
298 gboolean upstream_has_duration;
299 gint64 upstream_size;
300 /* minimum distance between two index entries */
301 GstClockTimeDiff idx_interval;
302 /* ts and offset of last entry added */
303 GstClockTime index_last_ts;
304 gint64 index_last_offset;
305 gboolean index_last_valid;
307 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
308 gboolean exact_position;
309 /* seek events are temporarily kept to match them with newsegments */
310 GSList *pending_seeks;
312 /* reverse playback */
313 GSList *buffers_pending;
314 GSList *buffers_queued;
315 GSList *buffers_send;
316 GstClockTime last_ts;
319 /* Newsegment event to be sent after SEEK */
320 GstEvent *pending_segment;
322 /* Segment event that closes the running segment prior to SEEK */
323 GstEvent *close_segment;
325 /* push mode helper frame */
326 GstBaseParseFrame frame;
328 /* TRUE if we're still detecting the format, i.e.
329 * if ::detect() is still called for future buffers */
331 GList *detect_buffers;
332 guint detect_buffers_size;
335 typedef struct _GstBaseParseSeek
340 GstClockTime start_ts;
343 #if !GLIB_CHECK_VERSION (2, 31, 0)
344 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
345 g_static_mutex_lock (&parse->priv->index_lock);
346 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
347 g_static_mutex_unlock (&parse->priv->index_lock);
349 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
350 g_mutex_lock (&parse->priv->index_lock);
351 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
352 g_mutex_unlock (&parse->priv->index_lock);
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);
393 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
394 static GstIndex *gst_base_parse_get_index (GstElement * element);
396 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
398 static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
399 GstObject * parent, GstPadMode mode, gboolean active);
400 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
402 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
404 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
406 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
409 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
411 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
414 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
416 static void gst_base_parse_loop (GstPad * pad);
418 static gboolean gst_base_parse_check_frame (GstBaseParse * parse,
419 GstBaseParseFrame * frame, guint * framesize, gint * skipsize);
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_process_fragment (GstBaseParse * parse,
442 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
445 gst_base_parse_clear_queues (GstBaseParse * parse)
447 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
448 g_slist_free (parse->priv->buffers_queued);
449 parse->priv->buffers_queued = NULL;
450 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
452 g_slist_free (parse->priv->buffers_pending);
453 parse->priv->buffers_pending = NULL;
454 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
455 g_slist_free (parse->priv->buffers_send);
456 parse->priv->buffers_send = NULL;
458 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
459 g_list_free (parse->priv->detect_buffers);
460 parse->priv->detect_buffers = NULL;
461 parse->priv->detect_buffers_size = 0;
465 gst_base_parse_finalize (GObject * object)
467 GstBaseParse *parse = GST_BASE_PARSE (object);
470 g_object_unref (parse->priv->adapter);
472 if (parse->priv->pending_segment) {
473 p_ev = &parse->priv->pending_segment;
474 gst_event_replace (p_ev, NULL);
476 if (parse->priv->close_segment) {
477 p_ev = &parse->priv->close_segment;
478 gst_event_replace (p_ev, NULL);
481 if (parse->priv->cache) {
482 gst_buffer_unref (parse->priv->cache);
483 parse->priv->cache = NULL;
486 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
488 g_list_free (parse->priv->pending_events);
489 parse->priv->pending_events = NULL;
491 g_queue_foreach (&parse->priv->queued_frames,
492 (GFunc) gst_base_parse_frame_free, NULL);
493 g_queue_clear (&parse->priv->queued_frames);
495 if (parse->priv->index) {
496 gst_object_unref (parse->priv->index);
497 parse->priv->index = NULL;
499 #if !GLIB_CHECK_VERSION (2, 31, 0)
500 g_static_mutex_free (&parse->priv->index_lock);
502 g_mutex_clear (&parse->priv->index_lock);
505 gst_base_parse_clear_queues (parse);
507 G_OBJECT_CLASS (parent_class)->finalize (object);
511 gst_base_parse_class_init (GstBaseParseClass * klass)
513 GObjectClass *gobject_class;
514 GstElementClass *gstelement_class;
516 gobject_class = G_OBJECT_CLASS (klass);
517 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
518 parent_class = g_type_class_peek_parent (klass);
519 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
521 gstelement_class = (GstElementClass *) klass;
522 gstelement_class->change_state =
523 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);
527 /* Default handlers */
528 klass->check_valid_frame = gst_base_parse_check_frame;
529 klass->parse_frame = gst_base_parse_parse_frame;
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 #if !GLIB_CHECK_VERSION (2, 31, 0)
583 g_static_mutex_init (&parse->priv->index_lock);
585 g_mutex_init (&parse->priv->index_lock);
589 gst_base_parse_reset (parse);
590 GST_DEBUG_OBJECT (parse, "init ok");
592 GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE);
595 static GstBaseParseFrame *
596 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
598 GstBaseParseFrame *copy;
600 copy = g_slice_dup (GstBaseParseFrame, frame);
601 copy->buffer = gst_buffer_ref (frame->buffer);
602 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
604 GST_TRACE ("copied frame %p -> %p", frame, copy);
610 gst_base_parse_frame_free (GstBaseParseFrame * frame)
612 GST_TRACE ("freeing frame %p", frame);
615 gst_buffer_unref (frame->buffer);
616 frame->buffer = NULL;
619 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
620 g_slice_free (GstBaseParseFrame, frame);
622 memset (frame, 0, sizeof (*frame));
627 gst_base_parse_frame_get_type (void)
629 static volatile gsize frame_type = 0;
631 if (g_once_init_enter (&frame_type)) {
634 _type = g_boxed_type_register_static ("GstBaseParseFrame",
635 (GBoxedCopyFunc) gst_base_parse_frame_copy,
636 (GBoxedFreeFunc) gst_base_parse_frame_free);
637 g_once_init_leave (&frame_type, _type);
639 return (GType) frame_type;
643 * gst_base_parse_frame_init:
644 * @frame: #GstBaseParseFrame.
646 * Sets a #GstBaseParseFrame to initial state. Currently this means
647 * all public fields are zero-ed and a private flag is set to make
648 * sure gst_base_parse_frame_free() only frees the contents but not
649 * the actual frame. Use this function to initialise a #GstBaseParseFrame
650 * allocated on the stack.
655 gst_base_parse_frame_init (GstBaseParseFrame * frame)
657 memset (frame, 0, sizeof (GstBaseParseFrame));
658 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
659 GST_TRACE ("inited frame %p", frame);
663 * gst_base_parse_frame_new:
664 * @buffer: (transfer none): a #GstBuffer
666 * @overhead: number of bytes in this frame which should be counted as
667 * metadata overhead, ie. not used to calculate the average bitrate.
668 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
670 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
671 * elements written in C should usually allocate the frame on the stack and
672 * then use gst_base_parse_frame_init() to initialise it.
674 * Returns: a newly-allocated #GstBaseParseFrame. Free with
675 * gst_base_parse_frame_free() when no longer needed, unless you gave
676 * away ownership to gst_base_parse_push_frame().
681 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
684 GstBaseParseFrame *frame;
686 frame = g_slice_new0 (GstBaseParseFrame);
687 frame->buffer = gst_buffer_ref (buffer);
689 GST_TRACE ("created frame %p", frame);
694 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
697 gst_buffer_replace (&frame->buffer, buf);
701 /* set flags one by one for clarity */
702 if (G_UNLIKELY (parse->priv->drain))
703 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
705 /* losing sync is pretty much a discont (and vice versa), no ? */
706 if (G_UNLIKELY (parse->priv->discont))
707 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
711 gst_base_parse_reset (GstBaseParse * parse)
713 GST_OBJECT_LOCK (parse);
714 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
715 parse->priv->duration = -1;
716 parse->priv->min_frame_size = 1;
717 parse->priv->discont = TRUE;
718 parse->priv->flushing = FALSE;
719 parse->priv->offset = 0;
720 parse->priv->sync_offset = 0;
721 parse->priv->update_interval = -1;
722 parse->priv->fps_num = parse->priv->fps_den = 0;
723 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
724 parse->priv->lead_in = parse->priv->lead_out = 0;
725 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
726 parse->priv->bitrate = 0;
727 parse->priv->framecount = 0;
728 parse->priv->bytecount = 0;
729 parse->priv->acc_duration = 0;
730 parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE;
731 parse->priv->first_frame_offset = -1;
732 parse->priv->estimated_duration = -1;
733 parse->priv->estimated_drift = 0;
734 parse->priv->next_ts = 0;
735 parse->priv->syncable = TRUE;
736 parse->priv->passthrough = FALSE;
737 parse->priv->has_timing_info = FALSE;
738 parse->priv->post_min_bitrate = TRUE;
739 parse->priv->post_avg_bitrate = TRUE;
740 parse->priv->post_max_bitrate = TRUE;
741 parse->priv->min_bitrate = G_MAXUINT;
742 parse->priv->max_bitrate = 0;
743 parse->priv->avg_bitrate = 0;
744 parse->priv->posted_avg_bitrate = 0;
746 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
747 parse->priv->index_last_offset = -1;
748 parse->priv->index_last_valid = TRUE;
749 parse->priv->upstream_seekable = FALSE;
750 parse->priv->upstream_size = 0;
751 parse->priv->upstream_has_duration = FALSE;
752 parse->priv->idx_interval = 0;
753 parse->priv->exact_position = TRUE;
754 parse->priv->seen_keyframe = FALSE;
756 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
757 parse->priv->last_offset = 0;
759 if (parse->priv->pending_segment) {
760 gst_event_unref (parse->priv->pending_segment);
761 parse->priv->pending_segment = NULL;
764 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
766 g_list_free (parse->priv->pending_events);
767 parse->priv->pending_events = NULL;
769 if (parse->priv->cache) {
770 gst_buffer_unref (parse->priv->cache);
771 parse->priv->cache = NULL;
774 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
775 g_slist_free (parse->priv->pending_seeks);
776 parse->priv->pending_seeks = NULL;
778 /* we know it is not alloc'ed, but maybe other stuff to free, some day ... */
779 parse->priv->frame._private_flags |=
780 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
781 gst_base_parse_frame_free (&parse->priv->frame);
783 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
784 g_list_free (parse->priv->detect_buffers);
785 parse->priv->detect_buffers = NULL;
786 parse->priv->detect_buffers_size = 0;
787 GST_OBJECT_UNLOCK (parse);
790 /* gst_base_parse_check_frame:
791 * @parse: #GstBaseParse.
792 * @buffer: GstBuffer.
793 * @framesize: This will be set to tell the found frame size in bytes.
794 * @skipsize: Output parameter that tells how much data needs to be skipped
795 * in order to find the following frame header.
797 * Default callback for check_valid_frame.
799 * Returns: Always TRUE.
802 gst_base_parse_check_frame (GstBaseParse * parse,
803 GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
805 *framesize = gst_buffer_get_size (frame->buffer);
811 /* gst_base_parse_parse_frame:
812 * @parse: #GstBaseParse.
813 * @buffer: #GstBuffer.
815 * Default callback for parse_frame.
818 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
820 GstBuffer *buffer = frame->buffer;
822 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
823 GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) {
824 GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts;
826 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
827 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
828 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
833 /* gst_base_parse_convert:
834 * @parse: #GstBaseParse.
835 * @src_format: #GstFormat describing the source format.
836 * @src_value: Source value to be converted.
837 * @dest_format: #GstFormat defining the converted format.
838 * @dest_value: Pointer where the conversion result will be put.
840 * Converts using configured "convert" vmethod in #GstBaseParse class.
842 * Returns: TRUE if conversion was successful.
845 gst_base_parse_convert (GstBaseParse * parse,
846 GstFormat src_format,
847 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
849 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
852 g_return_val_if_fail (dest_value != NULL, FALSE);
857 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
859 #ifndef GST_DISABLE_GST_DEBUG
862 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
863 GST_LOG_OBJECT (parse,
864 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
865 GST_TIME_ARGS (src_value), *dest_value);
866 } else if (dest_format == GST_FORMAT_TIME &&
867 src_format == GST_FORMAT_BYTES) {
868 GST_LOG_OBJECT (parse,
869 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
870 src_value, GST_TIME_ARGS (*dest_value));
872 GST_LOG_OBJECT (parse,
873 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
874 GST_STR_NULL (gst_format_get_name (src_format)),
875 GST_STR_NULL (gst_format_get_name (dest_format)),
876 src_value, *dest_value);
879 GST_DEBUG_OBJECT (parse, "conversion failed");
887 /* gst_base_parse_sink_event:
888 * @pad: #GstPad that received the event.
889 * @event: #GstEvent to be handled.
891 * Handler for sink pad events.
893 * Returns: TRUE if the event was handled.
896 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
899 GstBaseParseClass *bclass;
900 gboolean handled = FALSE;
903 parse = GST_BASE_PARSE (parent);
904 bclass = GST_BASE_PARSE_GET_CLASS (parse);
906 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
907 GST_EVENT_TYPE_NAME (event));
909 /* Cache all events except EOS, SEGMENT and FLUSH_STOP if we have a
911 if (parse->priv->pending_segment && GST_EVENT_TYPE (event) != GST_EVENT_EOS
912 && GST_EVENT_TYPE (event) != GST_EVENT_SEGMENT
913 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
914 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP
915 && GST_EVENT_TYPE (event) != GST_EVENT_CAPS) {
917 if (GST_EVENT_TYPE (event) == GST_EVENT_TAG)
918 /* See if any bitrate tags were posted */
919 gst_base_parse_handle_tag (parse, event);
921 parse->priv->pending_events =
922 g_list_append (parse->priv->pending_events, event);
926 if (GST_EVENT_TYPE (event) == GST_EVENT_EOS &&
927 parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
928 /* We've not posted bitrate tags yet - do so now */
929 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
932 handled = bclass->event (parse, event);
935 handled = gst_base_parse_sink_eventfunc (parse, event);
938 ret = gst_pad_event_default (pad, parent, event);
941 GST_DEBUG_OBJECT (parse, "event handled");
947 /* gst_base_parse_sink_eventfunc:
948 * @parse: #GstBaseParse.
949 * @event: #GstEvent to be handled.
951 * Element-level event handler function.
953 * The event will be unreffed only if it has been handled and this
954 * function returns %TRUE
956 * Returns: %TRUE if the event was handled and not need forwarding.
959 gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event)
961 gboolean handled = FALSE;
964 switch (GST_EVENT_TYPE (event)) {
968 GstBaseParseClass *klass;
970 klass = GST_BASE_PARSE_GET_CLASS (parse);
972 gst_event_parse_caps (event, &caps);
973 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
975 if (klass->set_sink_caps)
976 klass->set_sink_caps (parse, caps);
978 /* will send our own caps downstream */
979 gst_event_unref (event);
983 case GST_EVENT_SEGMENT:
985 const GstSegment *in_segment;
986 GstSegment out_segment;
987 gint64 offset = 0, next_ts;
990 gdouble rate, applied_rate;
992 gint64 start, stop, pos, next_ts;
996 gst_event_parse_segment (event, &in_segment);
997 gst_segment_init (&out_segment, GST_FORMAT_TIME);
999 GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
1001 if (in_segment->format == GST_FORMAT_BYTES) {
1002 GstBaseParseSeek *seek = NULL;
1005 /* stop time is allowed to be open-ended, but not start & pos */
1006 offset = in_segment->time;
1008 GST_OBJECT_LOCK (parse);
1009 for (node = parse->priv->pending_seeks; node; node = node->next) {
1010 GstBaseParseSeek *tmp = node->data;
1012 if (tmp->offset == offset) {
1017 parse->priv->pending_seeks =
1018 g_slist_remove (parse->priv->pending_seeks, seek);
1019 GST_OBJECT_UNLOCK (parse);
1022 GST_DEBUG_OBJECT (parse,
1023 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
1024 seek->accurate ? " accurate" : "", &seek->segment);
1026 out_segment.start = seek->segment.start;
1027 out_segment.stop = seek->segment.stop;
1028 out_segment.time = seek->segment.start;
1030 next_ts = seek->start_ts;
1031 parse->priv->exact_position = seek->accurate;
1034 /* best attempt convert */
1035 /* as these are only estimates, stop is kept open-ended to avoid
1036 * premature cutting */
1037 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
1038 GST_FORMAT_TIME, (gint64 *) & next_ts);
1040 out_segment.start = next_ts;
1041 out_segment.stop = GST_CLOCK_TIME_NONE;
1042 out_segment.time = next_ts;
1044 parse->priv->exact_position = (in_segment->start == 0);
1047 gst_event_unref (event);
1049 event = gst_event_new_segment (&out_segment);
1051 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1052 GST_SEGMENT_FORMAT, in_segment);
1054 } else if (in_segment->format != GST_FORMAT_TIME) {
1055 /* Unknown incoming segment format. Output a default open-ended
1057 gst_event_unref (event);
1059 out_segment.start = 0;
1060 out_segment.stop = GST_CLOCK_TIME_NONE;;
1061 out_segment.time = 0;;
1063 event = gst_event_new_segment (&out_segment);
1067 /* not considered BYTE seekable if it is talking to us in TIME,
1068 * whatever else it might claim */
1069 parse->priv->upstream_seekable = FALSE;
1070 next_ts = in_segment->start;
1073 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1076 gst_segment_set_newsegment (&parse->segment, update, rate,
1077 applied_rate, format, start, stop, start);
1080 /* save the segment for later, right before we push a new buffer so that
1081 * the caps are fixed and the next linked element can receive
1083 eventp = &parse->priv->pending_segment;
1084 gst_event_replace (eventp, event);
1085 gst_event_unref (event);
1088 /* but finish the current segment */
1089 GST_DEBUG_OBJECT (parse, "draining current segment");
1090 if (in_segment->rate > 0.0)
1091 gst_base_parse_drain (parse);
1093 gst_base_parse_process_fragment (parse, FALSE);
1094 gst_adapter_clear (parse->priv->adapter);
1096 parse->priv->offset = offset;
1097 parse->priv->sync_offset = offset;
1098 parse->priv->next_ts = next_ts;
1099 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1100 parse->priv->discont = TRUE;
1101 parse->priv->seen_keyframe = FALSE;
1105 case GST_EVENT_FLUSH_START:
1106 parse->priv->flushing = TRUE;
1107 handled = gst_pad_push_event (parse->srcpad, gst_event_ref (event));
1109 gst_event_unref (event);
1110 /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
1111 GST_PAD_STREAM_LOCK (parse->srcpad);
1112 GST_PAD_STREAM_UNLOCK (parse->srcpad);
1116 case GST_EVENT_FLUSH_STOP:
1117 gst_adapter_clear (parse->priv->adapter);
1118 gst_base_parse_clear_queues (parse);
1119 parse->priv->flushing = FALSE;
1120 parse->priv->discont = TRUE;
1121 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1122 parse->priv->frame._private_flags |=
1123 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
1124 gst_base_parse_frame_free (&parse->priv->frame);
1128 if (parse->segment.rate > 0.0)
1129 gst_base_parse_drain (parse);
1131 gst_base_parse_process_fragment (parse, FALSE);
1133 /* If we STILL have zero frames processed, fire an error */
1134 if (parse->priv->framecount == 0) {
1135 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1136 ("No valid frames found before end of stream"), (NULL));
1138 /* newsegment before eos */
1139 if (parse->priv->pending_segment) {
1140 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
1141 parse->priv->pending_segment = NULL;
1153 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1155 GstBaseParse *parse;
1156 GstBaseParseClass *bclass;
1159 parse = GST_BASE_PARSE (parent);
1160 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1162 switch (GST_QUERY_TYPE (query)) {
1163 case GST_QUERY_CAPS:
1165 if (bclass->get_sink_caps) {
1166 GstCaps *caps, *filter;
1168 gst_query_parse_caps (query, &filter);
1169 caps = bclass->get_sink_caps (parse, filter);
1170 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1172 gst_query_set_caps_result (query, caps);
1173 gst_caps_unref (caps);
1177 GstCaps *caps, *template_caps, *filter;
1179 gst_query_parse_caps (query, &filter);
1180 template_caps = gst_pad_get_pad_template_caps (pad);
1181 if (filter != NULL) {
1183 gst_caps_intersect_full (filter, template_caps,
1184 GST_CAPS_INTERSECT_FIRST);
1186 caps = gst_caps_copy (template_caps);
1188 gst_query_set_caps_result (query, caps);
1189 gst_caps_unref (caps);
1197 res = gst_pad_query_default (pad, parent, query);
1206 /* gst_base_parse_src_event:
1207 * @pad: #GstPad that received the event.
1208 * @event: #GstEvent that was received.
1210 * Handler for source pad events.
1212 * Returns: TRUE if the event was handled.
1215 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1217 GstBaseParse *parse;
1218 GstBaseParseClass *bclass;
1219 gboolean handled = FALSE;
1220 gboolean ret = TRUE;
1222 parse = GST_BASE_PARSE (parent);
1223 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1225 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1226 GST_EVENT_TYPE_NAME (event));
1228 if (bclass->src_event)
1229 handled = bclass->src_event (parse, event);
1232 ret = gst_pad_event_default (pad, parent, event);
1238 gst_base_parse_is_seekable (GstBaseParse * parse)
1240 /* FIXME: could do more here, e.g. check index or just send data from 0
1241 * in pull mode and let decoder/sink clip */
1242 return parse->priv->syncable;
1245 /* gst_base_parse_src_eventfunc:
1246 * @parse: #GstBaseParse.
1247 * @event: #GstEvent that was received.
1249 * Default srcpad event handler.
1251 * Returns: TRUE if the event was handled and can be dropped.
1254 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1256 gboolean handled = FALSE;
1258 switch (GST_EVENT_TYPE (event)) {
1259 case GST_EVENT_SEEK:
1261 if (gst_base_parse_is_seekable (parse)) {
1262 handled = gst_base_parse_handle_seek (parse, event);
1274 * gst_base_parse_convert_default:
1275 * @parse: #GstBaseParse.
1276 * @src_format: #GstFormat describing the source format.
1277 * @src_value: Source value to be converted.
1278 * @dest_format: #GstFormat defining the converted format.
1279 * @dest_value: Pointer where the conversion result will be put.
1281 * Default implementation of "convert" vmethod in #GstBaseParse class.
1283 * Returns: TRUE if conversion was successful.
1288 gst_base_parse_convert_default (GstBaseParse * parse,
1289 GstFormat src_format,
1290 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1292 gboolean ret = FALSE;
1293 guint64 bytes, duration;
1295 if (G_UNLIKELY (src_format == dest_format)) {
1296 *dest_value = src_value;
1300 if (G_UNLIKELY (src_value == -1)) {
1305 if (G_UNLIKELY (src_value == 0)) {
1310 /* need at least some frames */
1311 if (!parse->priv->framecount)
1314 duration = parse->priv->acc_duration / GST_MSECOND;
1315 bytes = parse->priv->bytecount;
1317 if (G_UNLIKELY (!duration || !bytes))
1320 if (src_format == GST_FORMAT_BYTES) {
1321 if (dest_format == GST_FORMAT_TIME) {
1322 /* BYTES -> TIME conversion */
1323 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1324 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1325 *dest_value *= GST_MSECOND;
1326 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1327 *dest_value / GST_MSECOND);
1330 } else if (src_format == GST_FORMAT_TIME) {
1331 if (dest_format == GST_FORMAT_BYTES) {
1332 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1333 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1335 GST_DEBUG_OBJECT (parse,
1336 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1337 src_value / GST_MSECOND, *dest_value);
1340 } else if (src_format == GST_FORMAT_DEFAULT) {
1341 /* DEFAULT == frame-based */
1342 if (dest_format == GST_FORMAT_TIME) {
1343 if (parse->priv->fps_den) {
1344 *dest_value = gst_util_uint64_scale (src_value,
1345 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1348 } else if (dest_format == GST_FORMAT_BYTES) {
1356 gst_base_parse_update_duration (GstBaseParse * baseparse)
1359 GstBaseParse *parse;
1361 parse = GST_BASE_PARSE (baseparse);
1363 peer = gst_pad_get_peer (parse->sinkpad);
1365 gboolean qres = FALSE;
1366 gint64 ptot, dest_value;
1368 qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot);
1369 gst_object_unref (GST_OBJECT (peer));
1371 if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1372 GST_FORMAT_TIME, &dest_value)) {
1374 /* inform if duration changed, but try to avoid spamming */
1375 parse->priv->estimated_drift +=
1376 dest_value - parse->priv->estimated_duration;
1377 if (parse->priv->estimated_drift > GST_SECOND ||
1378 parse->priv->estimated_drift < -GST_SECOND) {
1379 gst_element_post_message (GST_ELEMENT (parse),
1380 gst_message_new_duration (GST_OBJECT (parse),
1381 GST_FORMAT_TIME, dest_value));
1382 parse->priv->estimated_drift = 0;
1384 parse->priv->estimated_duration = dest_value;
1385 GST_LOG_OBJECT (parse,
1386 "updated estimated duration to %" GST_TIME_FORMAT,
1387 GST_TIME_ARGS (dest_value));
1394 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1395 gboolean post_avg, gboolean post_max)
1397 GstTagList *taglist = NULL;
1399 if (post_min && parse->priv->post_min_bitrate) {
1400 taglist = gst_tag_list_new_empty ();
1402 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1403 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1406 if (post_avg && parse->priv->post_avg_bitrate) {
1407 if (taglist == NULL)
1408 taglist = gst_tag_list_new_empty ();
1410 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1411 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1412 parse->priv->avg_bitrate, NULL);
1415 if (post_max && parse->priv->post_max_bitrate) {
1416 if (taglist == NULL)
1417 taglist = gst_tag_list_new_empty ();
1419 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1420 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1423 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1424 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1425 parse->priv->max_bitrate);
1427 if (taglist != NULL) {
1428 gst_pad_push_event (parse->srcpad, gst_event_new_tag (taglist));
1432 /* gst_base_parse_update_bitrates:
1433 * @parse: #GstBaseParse.
1434 * @buffer: Current frame as a #GstBuffer
1436 * Keeps track of the minimum and maximum bitrates, and also maintains a
1437 * running average bitrate of the stream so far.
1440 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1442 /* Only update the tag on a 10 kbps delta */
1443 static const gint update_threshold = 10000;
1445 guint64 data_len, frame_dur;
1446 gint overhead, frame_bitrate, old_avg_bitrate;
1447 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1448 GstBuffer *buffer = frame->buffer;
1450 overhead = frame->overhead;
1454 data_len = gst_buffer_get_size (buffer) - overhead;
1455 parse->priv->data_bytecount += data_len;
1457 /* duration should be valid by now,
1458 * either set by subclass or maybe based on fps settings */
1459 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1460 /* Calculate duration of a frame from buffer properties */
1461 frame_dur = GST_BUFFER_DURATION (buffer);
1462 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1463 parse->priv->acc_duration;
1466 /* No way to figure out frame duration (is this even possible?) */
1470 /* override if subclass provided bitrate, e.g. metadata based */
1471 if (parse->priv->bitrate) {
1472 parse->priv->avg_bitrate = parse->priv->bitrate;
1473 /* spread this (confirmed) info ASAP */
1474 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1475 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1479 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1483 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1484 parse->priv->avg_bitrate);
1486 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1488 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1489 /* always post all at threshold time */
1490 update_min = update_max = update_avg = TRUE;
1493 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1494 if (frame_bitrate < parse->priv->min_bitrate) {
1495 parse->priv->min_bitrate = frame_bitrate;
1499 if (frame_bitrate > parse->priv->max_bitrate) {
1500 parse->priv->max_bitrate = frame_bitrate;
1504 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1505 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1506 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1511 if ((update_min || update_avg || update_max))
1512 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1514 /* If average bitrate changes that much and no valid (time) duration provided,
1515 * then post a new duration message so applications can update their cached
1517 if (update_avg && !(parse->priv->duration_fmt == GST_FORMAT_TIME &&
1518 GST_CLOCK_TIME_IS_VALID (parse->priv->duration)))
1519 gst_element_post_message (GST_ELEMENT (parse),
1520 gst_message_new_duration (GST_OBJECT (parse), GST_FORMAT_TIME, -1));
1527 * gst_base_parse_add_index_entry:
1528 * @parse: #GstBaseParse.
1529 * @offset: offset of entry
1530 * @ts: timestamp associated with offset
1531 * @key: whether entry refers to keyframe
1532 * @force: add entry disregarding sanity checks
1534 * Adds an entry to the index associating @offset to @ts. It is recommended
1535 * to only add keyframe entries. @force allows to bypass checks, such as
1536 * whether the stream is (upstream) seekable, another entry is already "close"
1537 * to the new entry, etc.
1539 * Returns: #gboolean indicating whether entry was added
1544 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1545 GstClockTime ts, gboolean key, gboolean force)
1547 gboolean ret = FALSE;
1548 GstIndexAssociation associations[2];
1550 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1551 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1553 if (G_LIKELY (!force)) {
1555 if (!parse->priv->upstream_seekable) {
1556 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1560 /* FIXME need better helper data structure that handles these issues
1561 * related to ongoing collecting of index entries */
1562 if (parse->priv->index_last_offset >= (gint64) offset) {
1563 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1564 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1568 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1569 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1570 parse->priv->idx_interval) {
1571 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1572 GST_TIME_ARGS (parse->priv->index_last_ts));
1576 /* if last is not really the last one */
1577 if (!parse->priv->index_last_valid) {
1578 GstClockTime prev_ts;
1580 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1581 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1582 GST_DEBUG_OBJECT (parse,
1583 "entry too close to existing entry %" GST_TIME_FORMAT,
1584 GST_TIME_ARGS (prev_ts));
1585 parse->priv->index_last_offset = offset;
1586 parse->priv->index_last_ts = ts;
1592 associations[0].format = GST_FORMAT_TIME;
1593 associations[0].value = ts;
1594 associations[1].format = GST_FORMAT_BYTES;
1595 associations[1].value = offset;
1597 /* index might change on-the-fly, although that would be nutty app ... */
1598 GST_BASE_PARSE_INDEX_LOCK (parse);
1599 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1600 (key) ? GST_ASSOCIATION_FLAG_KEY_UNIT : GST_ASSOCIATION_FLAG_DELTA_UNIT,
1601 2, (const GstIndexAssociation *) &associations);
1602 GST_BASE_PARSE_INDEX_UNLOCK (parse);
1605 parse->priv->index_last_offset = offset;
1606 parse->priv->index_last_ts = ts;
1615 /* check for seekable upstream, above and beyond a mere query */
1617 gst_base_parse_check_seekability (GstBaseParse * parse)
1620 gboolean seekable = FALSE;
1621 gint64 start = -1, stop = -1;
1622 guint idx_interval = 0;
1624 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1625 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1626 GST_DEBUG_OBJECT (parse, "seeking query failed");
1630 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1632 /* try harder to query upstream size if we didn't get it the first time */
1633 if (seekable && stop == -1) {
1634 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1635 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1638 /* if upstream doesn't know the size, it's likely that it's not seekable in
1639 * practice even if it technically may be seekable */
1640 if (seekable && (start != 0 || stop <= start)) {
1641 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1645 /* let's not put every single frame into our index */
1647 if (stop < 10 * 1024 * 1024)
1649 else if (stop < 100 * 1024 * 1024)
1652 idx_interval = 1000;
1656 gst_query_unref (query);
1658 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1659 G_GUINT64_FORMAT ")", seekable, start, stop);
1660 parse->priv->upstream_seekable = seekable;
1661 parse->priv->upstream_size = seekable ? stop : 0;
1663 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1664 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1667 /* some misc checks on upstream */
1669 gst_base_parse_check_upstream (GstBaseParse * parse)
1673 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
1674 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1675 /* upstream has one, accept it also, and no further updates */
1676 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1677 parse->priv->upstream_has_duration = TRUE;
1680 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1681 parse->priv->upstream_has_duration);
1684 /* checks src caps to determine if dealing with audio or video */
1685 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1687 gst_base_parse_check_media (GstBaseParse * parse)
1692 caps = gst_pad_get_current_caps (parse->srcpad);
1693 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1694 parse->priv->is_video =
1695 g_str_has_prefix (gst_structure_get_name (s), "video");
1697 /* historical default */
1698 parse->priv->is_video = FALSE;
1701 gst_caps_unref (caps);
1703 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1706 /* takes ownership of frame */
1708 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1710 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1711 /* frame allocated on the heap, we can just take ownership */
1712 g_queue_push_tail (&parse->priv->queued_frames, frame);
1713 GST_TRACE ("queued frame %p", frame);
1715 GstBaseParseFrame *copy;
1717 /* probably allocated on the stack, must make a proper copy */
1718 copy = gst_base_parse_frame_copy (frame);
1719 g_queue_push_tail (&parse->priv->queued_frames, copy);
1720 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1721 gst_base_parse_frame_free (frame);
1725 /* gst_base_parse_handle_and_push_buffer:
1726 * @parse: #GstBaseParse.
1727 * @klass: #GstBaseParseClass.
1728 * @frame: (transfer full): a #GstBaseParseFrame
1730 * Parses the frame from given buffer and pushes it forward. Also performs
1731 * timestamp handling and checks the segment limits.
1733 * This is called with srcpad STREAM_LOCK held.
1735 * Returns: #GstFlowReturn
1737 static GstFlowReturn
1738 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1739 GstBaseParseClass * klass, GstBaseParseFrame * frame)
1745 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1747 buffer = frame->buffer;
1749 if (parse->priv->discont) {
1750 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1751 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1752 parse->priv->discont = FALSE;
1755 /* some one-time start-up */
1756 if (G_UNLIKELY (!parse->priv->framecount)) {
1757 gst_base_parse_check_seekability (parse);
1758 gst_base_parse_check_upstream (parse);
1761 GST_LOG_OBJECT (parse,
1762 "parsing frame at offset %" G_GUINT64_FORMAT
1763 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
1764 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1765 gst_buffer_get_size (buffer));
1767 /* use default handler to provide initial (upstream) metadata */
1768 gst_base_parse_parse_frame (parse, frame);
1770 /* store offset as it might get overwritten */
1771 offset = GST_BUFFER_OFFSET (buffer);
1772 ret = klass->parse_frame (parse, frame);
1774 buffer = frame->buffer;
1775 /* subclass must play nice */
1776 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1778 /* check if subclass/format can provide ts.
1779 * If so, that allows and enables extra seek and duration determining options */
1780 if (G_UNLIKELY (parse->priv->first_frame_offset < 0 && ret == GST_FLOW_OK)) {
1781 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1782 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1783 parse->priv->first_frame_offset = offset;
1784 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1785 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1786 " for first frame at offset %" G_GINT64_FORMAT,
1787 GST_TIME_ARGS (parse->priv->first_frame_ts),
1788 parse->priv->first_frame_offset);
1789 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1791 GstClockTime last_ts = G_MAXINT64;
1793 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1794 gst_base_parse_locate_time (parse, &last_ts, &off);
1795 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1796 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1799 /* disable further checks */
1800 parse->priv->first_frame_offset = 0;
1804 /* again use default handler to add missing metadata;
1805 * we may have new information on frame properties */
1806 gst_base_parse_parse_frame (parse, frame);
1807 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1808 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1809 parse->priv->next_ts =
1810 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1812 /* we lost track, do not produce bogus time next time around
1813 * (probably means parser subclass has given up on parsing as well) */
1814 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1815 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1818 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1819 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1820 gst_base_parse_add_index_entry (parse, offset,
1821 GST_BUFFER_TIMESTAMP (buffer),
1822 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1824 /* First buffers are dropped, this means that the subclass needs more
1825 * frames to decide on the format and queues them internally */
1826 /* convert internal flow to OK and mark discont for the next buffer. */
1827 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1828 gst_base_parse_frame_free (frame);
1830 } else if (ret == GST_BASE_PARSE_FLOW_QUEUED) {
1831 gst_base_parse_queue_frame (parse, frame);
1833 } else if (ret != GST_FLOW_OK) {
1837 /* All OK, push queued frames if there are any */
1838 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1839 GstBaseParseFrame *queued_frame;
1841 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1842 gst_base_parse_push_frame (parse, queued_frame);
1846 return gst_base_parse_push_frame (parse, frame);
1850 * gst_base_parse_push_frame:
1851 * @parse: #GstBaseParse.
1852 * @frame: (transfer full): a #GstBaseParseFrame
1854 * Pushes the frame downstream, sends any pending events and
1855 * does some timestamp and segment handling. Takes ownership
1856 * of @frame and will clear it (if it was initialised with
1857 * gst_base_parse_frame_init()) or free it.
1859 * This must be called with sinkpad STREAM_LOCK held.
1861 * Returns: #GstFlowReturn
1866 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1868 GstFlowReturn ret = GST_FLOW_OK;
1869 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1870 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1871 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1875 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1876 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1878 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1880 buffer = frame->buffer;
1882 GST_LOG_OBJECT (parse,
1883 "processing buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT
1884 ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer),
1885 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1886 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1889 size = gst_buffer_get_size (buffer);
1890 parse->priv->bytecount += size;
1891 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1892 parse->priv->framecount++;
1893 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1894 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1897 /* 0 means disabled */
1898 if (parse->priv->update_interval < 0)
1899 parse->priv->update_interval = 50;
1900 else if (parse->priv->update_interval > 0 &&
1901 (parse->priv->framecount % parse->priv->update_interval) == 0)
1902 gst_base_parse_update_duration (parse);
1904 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1905 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1906 if (last_start != GST_CLOCK_TIME_NONE
1907 && GST_BUFFER_DURATION_IS_VALID (buffer))
1908 last_stop = last_start + GST_BUFFER_DURATION (buffer);
1910 /* should have caps by now */
1911 g_return_val_if_fail (gst_pad_has_current_caps (parse->srcpad),
1914 /* segment adjustment magic; only if we are running the whole show */
1915 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
1916 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
1917 parse->priv->upstream_seekable)) {
1918 /* segment times are typically estimates,
1919 * actual frame data might lead subclass to different timestamps,
1920 * so override segment start from what is supplied there */
1921 if (G_UNLIKELY (parse->priv->pending_segment && !parse->priv->exact_position
1922 && GST_CLOCK_TIME_IS_VALID (last_start))) {
1923 gst_event_unref (parse->priv->pending_segment);
1924 parse->segment.start =
1925 MIN ((guint64) last_start, (guint64) parse->segment.stop);
1927 GST_DEBUG_OBJECT (parse,
1928 "adjusting pending segment start to %" GST_TIME_FORMAT,
1929 GST_TIME_ARGS (parse->segment.start));
1931 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
1933 /* handle gaps, e.g. non-zero start-time, in as much not handled by above */
1934 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
1935 GST_CLOCK_TIME_IS_VALID (last_start)) {
1936 GstClockTimeDiff diff;
1938 /* only send newsegments with increasing start times,
1939 * otherwise if these go back and forth downstream (sinks) increase
1940 * accumulated time and running_time */
1941 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
1942 if (G_UNLIKELY (diff > 2 * GST_SECOND
1943 && last_start > parse->segment.start
1944 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
1945 || last_start < parse->segment.stop))) {
1947 GST_DEBUG_OBJECT (parse,
1948 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
1949 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
1950 "Sending updated NEWSEGMENT events", diff,
1951 GST_TIME_ARGS (parse->segment.position),
1952 GST_TIME_ARGS (last_start));
1954 if (G_UNLIKELY (parse->priv->pending_segment)) {
1955 gst_event_unref (parse->priv->pending_segment);
1956 parse->segment.start = last_start;
1957 parse->segment.time = last_start;
1958 parse->priv->pending_segment =
1959 gst_event_new_segment (&parse->segment);
1961 /* skip gap FIXME */
1962 gst_pad_push_event (parse->srcpad,
1963 gst_event_new_segment (&parse->segment));
1965 parse->segment.position = last_start;
1970 /* and should then also be linked downstream, so safe to send some events */
1971 if (G_UNLIKELY (parse->priv->close_segment)) {
1972 /* only set up by loop */
1973 GST_DEBUG_OBJECT (parse, "loop sending close segment");
1974 gst_pad_push_event (parse->srcpad, parse->priv->close_segment);
1975 parse->priv->close_segment = NULL;
1977 if (G_UNLIKELY (parse->priv->pending_segment)) {
1978 GstEvent *pending_segment;
1980 pending_segment = parse->priv->pending_segment;
1981 parse->priv->pending_segment = NULL;
1983 GST_DEBUG_OBJECT (parse, "%s push pending segment",
1984 parse->priv->pad_mode == GST_PAD_MODE_PULL ? "loop" : "chain");
1985 gst_pad_push_event (parse->srcpad, pending_segment);
1987 /* have caps; check identity */
1988 gst_base_parse_check_media (parse);
1991 /* update bitrates and optionally post corresponding tags
1992 * (following newsegment) */
1993 gst_base_parse_update_bitrates (parse, frame);
1995 if (G_UNLIKELY (parse->priv->pending_events)) {
1998 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
1999 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
2001 g_list_free (parse->priv->pending_events);
2002 parse->priv->pending_events = NULL;
2005 if (klass->pre_push_frame) {
2006 ret = klass->pre_push_frame (parse, frame);
2008 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
2011 /* take final ownership of frame buffer */
2012 buffer = frame->buffer;
2013 frame->buffer = NULL;
2015 /* subclass must play nice */
2016 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2018 parse->priv->seen_keyframe |= parse->priv->is_video &&
2019 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
2021 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
2022 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2023 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
2024 GST_BUFFER_TIMESTAMP (buffer) >
2025 parse->segment.stop + parse->priv->lead_out_ts) {
2026 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
2028 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2029 GST_BUFFER_DURATION_IS_VALID (buffer) &&
2030 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
2031 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
2032 parse->priv->lead_in_ts < parse->segment.start) {
2033 if (parse->priv->seen_keyframe) {
2034 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
2037 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
2038 ret = GST_BASE_PARSE_FLOW_DROPPED;
2045 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2046 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2047 gst_buffer_unref (buffer);
2049 } else if (ret == GST_FLOW_OK) {
2050 if (parse->segment.rate > 0.0) {
2051 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2053 ret = gst_pad_push (parse->srcpad, buffer);
2054 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2056 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2058 parse->priv->buffers_queued =
2059 g_slist_prepend (parse->priv->buffers_queued, buffer);
2063 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2064 size, gst_flow_get_name (ret));
2065 gst_buffer_unref (buffer);
2066 /* if we are not sufficiently in control, let upstream decide on EOS */
2067 if (ret == GST_FLOW_EOS &&
2068 (parse->priv->passthrough ||
2069 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2070 !parse->priv->upstream_seekable)))
2074 /* Update current running segment position */
2075 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
2076 parse->segment.position < last_stop)
2077 parse->segment.position = last_stop;
2079 gst_base_parse_frame_free (frame);
2085 /* gst_base_parse_drain:
2087 * Drains the adapter until it is empty. It decreases the min_frame_size to
2088 * match the current adapter size and calls chain method until the adapter
2089 * is emptied or chain returns with error.
2092 gst_base_parse_drain (GstBaseParse * parse)
2096 GST_DEBUG_OBJECT (parse, "draining");
2097 parse->priv->drain = TRUE;
2100 avail = gst_adapter_available (parse->priv->adapter);
2104 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2105 NULL) != GST_FLOW_OK) {
2109 /* nothing changed, maybe due to truncated frame; break infinite loop */
2110 if (avail == gst_adapter_available (parse->priv->adapter)) {
2111 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2112 gst_adapter_clear (parse->priv->adapter);
2116 parse->priv->drain = FALSE;
2119 /* gst_base_parse_send_buffers
2121 * Sends buffers collected in send_buffers downstream, and ensures that list
2122 * is empty at the end (errors or not).
2124 static GstFlowReturn
2125 gst_base_parse_send_buffers (GstBaseParse * parse)
2127 GSList *send = NULL;
2129 GstFlowReturn ret = GST_FLOW_OK;
2131 send = parse->priv->buffers_send;
2135 buf = GST_BUFFER_CAST (send->data);
2136 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
2137 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2138 ", offset %" G_GINT64_FORMAT, buf,
2139 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
2140 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2142 /* iterate output queue an push downstream */
2143 ret = gst_pad_push (parse->srcpad, buf);
2144 send = g_slist_delete_link (send, send);
2146 /* clear any leftover if error */
2147 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2149 buf = GST_BUFFER_CAST (send->data);
2150 gst_buffer_unref (buf);
2151 send = g_slist_delete_link (send, send);
2156 parse->priv->buffers_send = send;
2161 /* gst_base_parse_process_fragment:
2163 * Processes a reverse playback (forward) fragment:
2164 * - append head of last fragment that was skipped to current fragment data
2165 * - drain the resulting current fragment data (i.e. repeated chain)
2166 * - add time/duration (if needed) to frames queued by chain
2167 * - push queued data
2169 static GstFlowReturn
2170 gst_base_parse_process_fragment (GstBaseParse * parse, gboolean push_only)
2173 GstFlowReturn ret = GST_FLOW_OK;
2174 gboolean seen_key = FALSE, seen_delta = FALSE;
2180 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2181 while (parse->priv->buffers_pending) {
2182 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2183 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2184 gst_buffer_get_size (buf));
2185 gst_adapter_push (parse->priv->adapter, buf);
2186 parse->priv->buffers_pending =
2187 g_slist_delete_link (parse->priv->buffers_pending,
2188 parse->priv->buffers_pending);
2191 /* invalidate so no fall-back timestamping is performed;
2192 * ok if taken from subclass or upstream */
2193 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2194 /* prevent it hanging around stop all the time */
2195 parse->segment.position = GST_CLOCK_TIME_NONE;
2197 parse->priv->discont = TRUE;
2199 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2200 /* initial skipped data is added to buffers_pending */
2201 gst_base_parse_drain (parse);
2204 if (parse->priv->buffers_send) {
2205 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2206 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2209 /* add metadata (if needed to queued buffers */
2210 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2211 GST_TIME_ARGS (parse->priv->last_ts));
2212 while (parse->priv->buffers_queued) {
2213 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2215 /* no touching if upstream or parsing provided time */
2216 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2217 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2218 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2219 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2220 GST_BUFFER_DURATION_IS_VALID (buf)) {
2221 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2222 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2224 parse->priv->last_ts = 0;
2225 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2226 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2227 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2229 /* no idea, very bad */
2230 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2233 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2235 /* reverse order for ascending sending */
2236 /* send downstream at keyframe not preceded by a keyframe
2237 * (e.g. that should identify start of collection of IDR nals) */
2238 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2240 ret = gst_base_parse_send_buffers (parse);
2241 /* if a problem, throw all to sending */
2242 if (ret != GST_FLOW_OK) {
2243 parse->priv->buffers_send =
2244 g_slist_reverse (parse->priv->buffers_queued);
2245 parse->priv->buffers_queued = NULL;
2254 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2256 parse->priv->buffers_send =
2257 g_slist_prepend (parse->priv->buffers_send, buf);
2258 parse->priv->buffers_queued =
2259 g_slist_delete_link (parse->priv->buffers_queued,
2260 parse->priv->buffers_queued);
2263 /* audio may have all marked as keyframe, so arrange to send here */
2265 ret = gst_base_parse_send_buffers (parse);
2267 /* any trailing unused no longer usable (ideally none) */
2268 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2269 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2270 gst_adapter_available (parse->priv->adapter));
2271 gst_adapter_clear (parse->priv->adapter);
2277 /* small helper that checks whether we have been trying to resync too long */
2278 static inline GstFlowReturn
2279 gst_base_parse_check_sync (GstBaseParse * parse)
2281 if (G_UNLIKELY (parse->priv->discont &&
2282 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2283 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2284 ("Failed to parse stream"), (NULL));
2285 return GST_FLOW_ERROR;
2291 static GstFlowReturn
2292 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
2294 GstBaseParseClass *bclass;
2295 GstBaseParse *parse;
2296 GstFlowReturn ret = GST_FLOW_OK;
2297 GstBuffer *outbuf = NULL;
2298 GstBuffer *tmpbuf = NULL;
2302 guint old_min_size = 0, min_size, av;
2303 GstClockTime timestamp;
2304 GstBaseParseFrame *frame;
2306 parse = GST_BASE_PARSE (parent);
2307 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2309 if (parse->priv->detecting) {
2310 GstBuffer *detect_buf;
2312 if (parse->priv->detect_buffers_size == 0) {
2313 detect_buf = gst_buffer_ref (buffer);
2318 detect_buf = gst_buffer_new ();
2320 for (l = parse->priv->detect_buffers; l; l = l->next) {
2321 gsize tmpsize = gst_buffer_get_size (l->data);
2323 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
2324 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
2328 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
2329 offset, gst_buffer_get_size (buffer));
2332 ret = bclass->detect (parse, detect_buf);
2333 gst_buffer_unref (detect_buf);
2335 if (ret == GST_FLOW_OK) {
2338 /* Detected something */
2339 parse->priv->detecting = FALSE;
2341 for (l = parse->priv->detect_buffers; l; l = l->next) {
2342 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2344 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2345 parent, GST_BUFFER_CAST (l->data));
2347 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2349 g_list_free (parse->priv->detect_buffers);
2350 parse->priv->detect_buffers = NULL;
2351 parse->priv->detect_buffers_size = 0;
2353 if (ret != GST_FLOW_OK) {
2357 /* Handle the current buffer */
2358 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2359 /* Still detecting, append buffer or error out if draining */
2361 if (parse->priv->drain) {
2362 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2363 return GST_FLOW_ERROR;
2364 } else if (parse->priv->flushing) {
2365 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2367 g_list_free (parse->priv->detect_buffers);
2368 parse->priv->detect_buffers = NULL;
2369 parse->priv->detect_buffers_size = 0;
2371 parse->priv->detect_buffers =
2372 g_list_append (parse->priv->detect_buffers, buffer);
2373 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
2377 /* Something went wrong, subclass responsible for error reporting */
2381 /* And now handle the current buffer if detection worked */
2384 frame = &parse->priv->frame;
2386 if (G_LIKELY (buffer)) {
2387 GST_LOG_OBJECT (parse,
2388 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT,
2389 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer));
2390 if (G_UNLIKELY (parse->priv->passthrough)) {
2391 gst_base_parse_frame_init (frame);
2392 frame->buffer = gst_buffer_make_writable (buffer);
2393 return gst_base_parse_push_frame (parse, frame);
2395 /* upstream feeding us in reverse playback;
2396 * gather each fragment, then process it in single run */
2397 if (parse->segment.rate < 0.0) {
2398 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2399 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2400 ret = gst_base_parse_process_fragment (parse, FALSE);
2402 gst_adapter_push (parse->priv->adapter, buffer);
2405 gst_adapter_push (parse->priv->adapter, buffer);
2408 if (G_UNLIKELY (buffer &&
2409 GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2410 frame->_private_flags |= GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
2411 gst_base_parse_frame_free (frame);
2414 /* Parse and push as many frames as possible */
2415 /* Stop either when adapter is empty or we are flushing */
2416 while (!parse->priv->flushing) {
2419 /* maintain frame state for a single frame parsing round across _chain calls,
2420 * so only init when needed */
2421 if (!frame->_private_flags)
2422 gst_base_parse_frame_init (frame);
2424 tmpbuf = gst_buffer_new ();
2427 /* Synchronization loop */
2429 /* note: if subclass indicates MAX fsize,
2430 * this will not likely be available anyway ... */
2431 min_size = MAX (parse->priv->min_frame_size, fsize);
2432 av = gst_adapter_available (parse->priv->adapter);
2434 /* loop safety check */
2435 if (G_UNLIKELY (old_min_size >= min_size))
2437 old_min_size = min_size;
2439 if (G_UNLIKELY (parse->priv->drain)) {
2441 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2442 if (G_UNLIKELY (!min_size)) {
2443 gst_buffer_unref (tmpbuf);
2448 /* Collect at least min_frame_size bytes */
2449 if (av < min_size) {
2450 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)",
2452 gst_buffer_unref (tmpbuf);
2456 /* always pass all available data */
2457 data = gst_adapter_map (parse->priv->adapter, av);
2458 gst_buffer_take_memory (tmpbuf, -1,
2459 gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY,
2460 (gpointer) data, NULL, av, 0, av));
2461 GST_BUFFER_OFFSET (tmpbuf) = parse->priv->offset;
2463 if (parse->priv->discont) {
2464 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2465 GST_BUFFER_FLAG_SET (tmpbuf, GST_BUFFER_FLAG_DISCONT);
2469 gst_base_parse_frame_update (parse, frame, tmpbuf);
2470 res = bclass->check_valid_frame (parse, frame, &fsize, &skip);
2471 gst_adapter_unmap (parse->priv->adapter);
2472 gst_buffer_replace (&frame->buffer, NULL);
2473 gst_buffer_remove_memory_range (tmpbuf, 0, -1);
2475 if (gst_adapter_available (parse->priv->adapter) < fsize) {
2476 GST_DEBUG_OBJECT (parse, "found valid frame but not enough data"
2477 " available (only %" G_GSIZE_FORMAT " bytes)",
2478 gst_adapter_available (parse->priv->adapter));
2479 gst_buffer_unref (tmpbuf);
2482 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2486 /* subclass didn't touch this value. By default we skip 1 byte */
2490 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2491 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2492 /* reverse playback, and no frames found yet, so we are skipping
2493 * the leading part of a fragment, which may form the tail of
2494 * fragment coming later, hopefully subclass skips efficiently ... */
2495 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2496 outbuf = gst_adapter_take_buffer (parse->priv->adapter, skip);
2497 outbuf = gst_buffer_make_writable (outbuf);
2498 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
2499 parse->priv->buffers_pending =
2500 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2503 gst_adapter_flush (parse->priv->adapter, skip);
2505 parse->priv->offset += skip;
2506 if (!parse->priv->discont)
2507 parse->priv->sync_offset = parse->priv->offset;
2508 parse->priv->discont = TRUE;
2509 /* something changed least; nullify loop check */
2512 /* skip == 0 should imply subclass set min_size to need more data;
2513 * we check this shortly */
2514 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2515 gst_buffer_unref (tmpbuf);
2519 gst_buffer_unref (tmpbuf);
2523 /* Subclass found the sync, but still wants to skip some data */
2524 GST_LOG_OBJECT (parse, "skipping %d bytes", skip);
2525 gst_adapter_flush (parse->priv->adapter, skip);
2526 parse->priv->offset += skip;
2529 /* Grab lock to prevent a race with FLUSH_START handler */
2530 GST_PAD_STREAM_LOCK (parse->srcpad);
2532 /* FLUSH_START event causes the "flushing" flag to be set. In this
2533 * case we can leave the frame pushing loop */
2534 if (parse->priv->flushing) {
2535 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2539 /* move along with upstream timestamp (if any),
2540 * but interpolate in between */
2541 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2542 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2543 (parse->priv->prev_ts != timestamp)) {
2544 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2547 /* FIXME: Would it be more efficient to make a subbuffer instead? */
2548 outbuf = gst_adapter_take_buffer (parse->priv->adapter, fsize);
2549 outbuf = gst_buffer_make_writable (outbuf);
2551 /* Subclass may want to know the data offset */
2552 GST_BUFFER_OFFSET (outbuf) = parse->priv->offset;
2553 parse->priv->offset += fsize;
2554 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2555 GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
2557 frame->buffer = outbuf;
2558 ret = gst_base_parse_handle_and_push_frame (parse, bclass, frame);
2559 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2561 if (ret != GST_FLOW_OK) {
2562 GST_LOG_OBJECT (parse, "push returned %d", ret);
2568 GST_LOG_OBJECT (parse, "chain leaving");
2574 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2575 ("min_size evolution %d -> %d; breaking to avoid looping",
2576 old_min_size, min_size));
2577 return GST_FLOW_ERROR;
2581 /* pull @size bytes at current offset,
2582 * i.e. at least try to and possibly return a shorter buffer if near the end */
2583 static GstFlowReturn
2584 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2585 GstBuffer ** buffer)
2587 GstFlowReturn ret = GST_FLOW_OK;
2589 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2591 /* Caching here actually makes much less difference than one would expect.
2592 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2593 if (parse->priv->cache) {
2594 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2595 gint cache_size = gst_buffer_get_size (parse->priv->cache);
2597 if (cache_offset <= parse->priv->offset &&
2598 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2599 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
2600 parse->priv->offset - cache_offset, size);
2601 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2604 /* not enough data in the cache, free cache and get a new one */
2605 gst_buffer_unref (parse->priv->cache);
2606 parse->priv->cache = NULL;
2609 /* refill the cache */
2611 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2612 64 * 1024), &parse->priv->cache);
2613 if (ret != GST_FLOW_OK) {
2614 parse->priv->cache = NULL;
2618 if (gst_buffer_get_size (parse->priv->cache) >= size) {
2620 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
2622 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2626 /* Not possible to get enough data, try a last time with
2627 * requesting exactly the size we need */
2628 gst_buffer_unref (parse->priv->cache);
2629 parse->priv->cache = NULL;
2631 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2632 &parse->priv->cache);
2634 if (ret != GST_FLOW_OK) {
2635 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2640 if (gst_buffer_get_size (parse->priv->cache) < size) {
2641 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2642 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
2643 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
2645 *buffer = parse->priv->cache;
2646 parse->priv->cache = NULL;
2652 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
2653 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2658 static GstFlowReturn
2659 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2662 GstClockTime ts = 0;
2666 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2667 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2668 parse->priv->last_offset);
2670 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2671 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2672 GST_TIME_ARGS (parse->segment.start));
2677 /* last fragment started at last_offset / last_ts;
2678 * seek back 10s capped at 1MB */
2679 if (parse->priv->last_ts >= 10 * GST_SECOND)
2680 ts = parse->priv->last_ts - 10 * GST_SECOND;
2681 /* if we are exact now, we will be more so going backwards */
2682 if (parse->priv->exact_position) {
2683 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2685 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2686 GST_FORMAT_BYTES, &offset)) {
2687 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2690 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2691 parse->priv->last_offset - 1024);
2692 offset = MAX (0, offset);
2694 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2696 parse->priv->offset = offset;
2698 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2700 if (ret != GST_FLOW_OK)
2703 /* offset will increase again as fragment is processed/parsed */
2704 parse->priv->last_offset = offset;
2706 gst_adapter_push (parse->priv->adapter, buffer);
2707 ret = gst_base_parse_process_fragment (parse, FALSE);
2708 if (ret != GST_FLOW_OK)
2711 /* force previous fragment */
2712 parse->priv->offset = -1;
2719 * pull and scan for next frame starting from current offset
2720 * ajusts sync, drain and offset going along */
2721 static GstFlowReturn
2722 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2723 GstBaseParseFrame * frame, gboolean full)
2725 GstBuffer *buffer, *outbuf;
2726 GstFlowReturn ret = GST_FLOW_OK;
2727 guint fsize = 1, min_size, old_min_size = 0;
2730 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2732 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2733 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2735 /* let's make this efficient for all subclass once and for all;
2736 * maybe it does not need this much, but in the latter case, we know we are
2737 * in pull mode here and might as well try to read and supply more anyway
2738 * (so does the buffer caching mechanism) */
2744 min_size = MAX (parse->priv->min_frame_size, fsize);
2745 /* loop safety check */
2746 if (G_UNLIKELY (old_min_size >= min_size))
2748 old_min_size = min_size;
2750 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2751 if (ret != GST_FLOW_OK)
2754 if (parse->priv->discont) {
2755 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2756 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
2759 /* if we got a short read, inform subclass we are draining leftover
2760 * and no more is to be expected */
2761 if (gst_buffer_get_size (buffer) < min_size)
2762 parse->priv->drain = TRUE;
2764 if (parse->priv->detecting) {
2765 ret = klass->detect (parse, buffer);
2766 if (ret == GST_FLOW_NOT_NEGOTIATED) {
2767 /* If draining we error out, otherwise request a buffer
2769 if (parse->priv->drain) {
2770 gst_buffer_unref (buffer);
2771 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
2772 return GST_FLOW_ERROR;
2775 gst_buffer_unref (buffer);
2778 } else if (ret != GST_FLOW_OK) {
2779 gst_buffer_unref (buffer);
2780 GST_ERROR_OBJECT (parse, "detect() returned %s",
2781 gst_flow_get_name (ret));
2785 /* Else handle this buffer normally */
2789 gst_base_parse_frame_update (parse, frame, buffer);
2790 res = klass->check_valid_frame (parse, frame, &fsize, &skip);
2791 gst_buffer_replace (&frame->buffer, NULL);
2793 parse->priv->drain = FALSE;
2794 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2797 parse->priv->drain = FALSE;
2801 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2802 if (full && parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2803 /* reverse playback, and no frames found yet, so we are skipping
2804 * the leading part of a fragment, which may form the tail of
2805 * fragment coming later, hopefully subclass skips efficiently ... */
2806 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, 0, skip);
2807 parse->priv->buffers_pending =
2808 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2811 parse->priv->offset += skip;
2812 if (!parse->priv->discont)
2813 parse->priv->sync_offset = parse->priv->offset;
2814 parse->priv->discont = TRUE;
2815 /* something changed at least; nullify loop check */
2816 if (fsize == G_MAXUINT)
2817 fsize = old_min_size + 64 * 1024;
2820 /* skip == 0 should imply subclass set min_size to need more data;
2821 * we check this shortly */
2822 GST_DEBUG_OBJECT (parse, "finding sync...");
2823 gst_buffer_unref (buffer);
2824 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2829 /* Does the subclass want to skip too? */
2831 parse->priv->offset += skip;
2835 if (fsize + skip <= gst_buffer_get_size (buffer)) {
2836 outbuf = gst_buffer_copy_region (buffer, GST_BUFFER_COPY_ALL, skip, fsize);
2837 GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer) + skip;
2838 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2839 gst_buffer_unref (buffer);
2841 gst_buffer_unref (buffer);
2842 ret = gst_base_parse_pull_range (parse, fsize, &outbuf);
2843 if (ret != GST_FLOW_OK)
2845 if (gst_buffer_get_size (outbuf) < fsize) {
2846 gst_buffer_unref (outbuf);
2851 parse->priv->offset += fsize;
2853 frame->buffer = outbuf;
2861 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2862 ("min_size evolution %d -> %d; breaking to avoid looping",
2863 old_min_size, min_size));
2864 return GST_FLOW_ERROR;
2868 /* Loop that is used in pull mode to retrieve data from upstream */
2870 gst_base_parse_loop (GstPad * pad)
2872 GstBaseParse *parse;
2873 GstBaseParseClass *klass;
2874 GstFlowReturn ret = GST_FLOW_OK;
2875 GstBaseParseFrame frame;
2877 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2878 klass = GST_BASE_PARSE_GET_CLASS (parse);
2880 /* reverse playback:
2881 * first fragment (closest to stop time) is handled normally below,
2882 * then we pull in fragments going backwards */
2883 if (parse->segment.rate < 0.0) {
2884 /* check if we jumped back to a previous fragment,
2885 * which is a post-first fragment */
2886 if (parse->priv->offset < 0) {
2887 ret = gst_base_parse_handle_previous_fragment (parse);
2892 gst_base_parse_frame_init (&frame);
2893 ret = gst_base_parse_scan_frame (parse, klass, &frame, TRUE);
2894 if (ret != GST_FLOW_OK)
2897 /* This always cleans up frame, even if error occurs */
2898 ret = gst_base_parse_handle_and_push_frame (parse, klass, &frame);
2900 /* eat expected eos signalling past segment in reverse playback */
2901 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
2902 parse->segment.position >= parse->segment.stop) {
2903 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2904 /* push what was accumulated during loop run */
2905 gst_base_parse_process_fragment (parse, TRUE);
2906 /* force previous fragment */
2907 parse->priv->offset = -1;
2912 if (ret == GST_FLOW_EOS)
2914 else if (ret != GST_FLOW_OK)
2917 gst_object_unref (parse);
2924 GST_DEBUG_OBJECT (parse, "eos");
2929 gboolean push_eos = FALSE;
2931 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2932 gst_flow_get_name (ret));
2933 gst_pad_pause_task (parse->sinkpad);
2935 if (ret == GST_FLOW_EOS) {
2936 /* handle end-of-stream/segment */
2937 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2940 if ((stop = parse->segment.stop) == -1)
2941 stop = parse->segment.duration;
2943 GST_DEBUG_OBJECT (parse, "sending segment_done");
2945 gst_element_post_message
2946 (GST_ELEMENT_CAST (parse),
2947 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2948 GST_FORMAT_TIME, stop));
2950 /* If we STILL have zero frames processed, fire an error */
2951 if (parse->priv->framecount == 0) {
2952 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2953 ("No valid frames found before end of stream"), (NULL));
2957 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
2958 /* for fatal errors we post an error message, wrong-state is
2959 * not fatal because it happens due to flushes and only means
2960 * that we should stop now. */
2961 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2962 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
2966 /* newsegment before eos */
2967 if (parse->priv->pending_segment) {
2968 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
2969 parse->priv->pending_segment = NULL;
2971 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
2973 gst_object_unref (parse);
2978 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
2980 GstBaseParse *parse;
2981 gboolean result = TRUE;
2985 parse = GST_BASE_PARSE (parent);
2987 GST_DEBUG_OBJECT (parse, "sink activate");
2989 query = gst_query_new_scheduling ();
2990 result = gst_pad_peer_query (sinkpad, query);
2992 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL);
2996 gst_query_unref (query);
2999 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
3000 result = gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE);
3002 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
3003 result = gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
3006 GST_DEBUG_OBJECT (parse, "sink activate return %d", result);
3011 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
3013 GstBaseParseClass *klass;
3014 gboolean result = TRUE;
3016 GST_DEBUG_OBJECT (parse, "activate %d", active);
3018 klass = GST_BASE_PARSE_GET_CLASS (parse);
3021 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
3022 result = klass->start (parse);
3024 /* If the subclass implements ::detect we want to
3025 * call it for the first buffers now */
3026 parse->priv->detecting = (klass->detect != NULL);
3028 /* We must make sure streaming has finished before resetting things
3029 * and calling the ::stop vfunc */
3030 GST_PAD_STREAM_LOCK (parse->sinkpad);
3031 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3033 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
3034 result = klass->stop (parse);
3036 parse->priv->pad_mode = GST_PAD_MODE_NONE;
3038 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
3043 gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
3044 GstPadMode mode, gboolean active)
3046 gboolean result = TRUE;
3047 GstBaseParse *parse;
3049 parse = GST_BASE_PARSE (parent);
3051 GST_DEBUG_OBJECT (parse, "sink activate mode %d, %d", mode, active);
3053 result = gst_base_parse_activate (parse, active);
3057 case GST_PAD_MODE_PULL:
3059 parse->priv->pending_segment =
3060 gst_event_new_segment (&parse->segment);
3062 gst_pad_start_task (pad, (GstTaskFunction) gst_base_parse_loop,
3065 result &= gst_pad_stop_task (pad);
3073 parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
3075 GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
3081 * gst_base_parse_set_duration:
3082 * @parse: #GstBaseParse.
3084 * @duration: duration value.
3085 * @interval: how often to update the duration estimate based on bitrate, or 0.
3087 * Sets the duration of the currently playing media. Subclass can use this
3088 * when it is able to determine duration and/or notices a change in the media
3089 * duration. Alternatively, if @interval is non-zero (default), then stream
3090 * duration is determined based on estimated bitrate, and updated every @interval
3096 gst_base_parse_set_duration (GstBaseParse * parse,
3097 GstFormat fmt, gint64 duration, gint interval)
3099 g_return_if_fail (parse != NULL);
3101 if (parse->priv->upstream_has_duration) {
3102 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3106 if (duration != parse->priv->duration) {
3109 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
3110 gst_element_post_message (GST_ELEMENT (parse), m);
3112 /* TODO: what about duration tag? */
3114 parse->priv->duration = duration;
3115 parse->priv->duration_fmt = fmt;
3116 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3117 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3118 if (interval != 0) {
3119 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3123 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3124 parse->priv->update_interval = interval;
3130 * gst_base_parse_set_average_bitrate:
3131 * @parse: #GstBaseParse.
3132 * @bitrate: average bitrate in bits/second
3134 * Optionally sets the average bitrate detected in media (if non-zero),
3135 * e.g. based on metadata, as it will be posted to the application.
3137 * By default, announced average bitrate is estimated. The average bitrate
3138 * is used to estimate the total duration of the stream and to estimate
3139 * a seek position, if there's no index and the format is syncable
3140 * (see gst_base_parse_set_syncable()).
3145 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3147 parse->priv->bitrate = bitrate;
3148 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3152 * gst_base_parse_set_min_frame_size:
3153 * @parse: #GstBaseParse.
3154 * @min_size: Minimum size of the data that this base class should give to
3157 * Subclass can use this function to tell the base class that it needs to
3158 * give at least #min_size buffers.
3163 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3165 g_return_if_fail (parse != NULL);
3167 parse->priv->min_frame_size = min_size;
3168 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3172 * gst_base_parse_set_frame_rate:
3173 * @parse: the #GstBaseParse to set
3174 * @fps_num: frames per second (numerator).
3175 * @fps_den: frames per second (denominator).
3176 * @lead_in: frames needed before a segment for subsequent decode
3177 * @lead_out: frames needed after a segment
3179 * If frames per second is configured, parser can take care of buffer duration
3180 * and timestamping. When performing segment clipping, or seeking to a specific
3181 * location, a corresponding decoder might need an initial @lead_in and a
3182 * following @lead_out number of frames to ensure the desired segment is
3183 * entirely filled upon decoding.
3188 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3189 guint fps_den, guint lead_in, guint lead_out)
3191 g_return_if_fail (parse != NULL);
3193 parse->priv->fps_num = fps_num;
3194 parse->priv->fps_den = fps_den;
3195 if (!fps_num || !fps_den) {
3196 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3198 fps_num = fps_den = 0;
3199 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3200 parse->priv->lead_in = parse->priv->lead_out = 0;
3201 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3203 parse->priv->frame_duration =
3204 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3205 parse->priv->lead_in = lead_in;
3206 parse->priv->lead_out = lead_out;
3207 parse->priv->lead_in_ts =
3208 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3209 parse->priv->lead_out_ts =
3210 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3211 /* aim for about 1.5s to estimate duration */
3212 if (parse->priv->update_interval < 0) {
3213 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3214 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3215 parse->priv->update_interval);
3218 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3219 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3220 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3221 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3222 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3223 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3227 * gst_base_parse_set_has_timing_info:
3228 * @parse: a #GstBaseParse
3229 * @has_timing: whether frames carry timing information
3231 * Set if frames carry timing information which the subclass can (generally)
3232 * parse and provide. In particular, intrinsic (rather than estimated) time
3233 * can be obtained following a seek.
3238 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3240 parse->priv->has_timing_info = has_timing;
3241 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3245 * gst_base_parse_set_syncable:
3246 * @parse: a #GstBaseParse
3247 * @syncable: set if frame starts can be identified
3249 * Set if frame starts can be identified. This is set by default and
3250 * determines whether seeking based on bitrate averages
3251 * is possible for a format/stream.
3256 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3258 parse->priv->syncable = syncable;
3259 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3263 * gst_base_parse_set_passthrough:
3264 * @parse: a #GstBaseParse
3265 * @passthrough: %TRUE if parser should run in passthrough mode
3267 * Set if the nature of the format or configuration does not allow (much)
3268 * parsing, and the parser should operate in passthrough mode (which only
3269 * applies when operating in push mode). That is, incoming buffers are
3270 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3271 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3272 * so subclass can perform as much or as little is appropriate for
3273 * passthrough semantics in @pre_push_frame.
3278 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3280 parse->priv->passthrough = passthrough;
3281 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3285 * gst_base_parse_set_latency:
3286 * @parse: a #GstBaseParse
3287 * @min_latency: minimum parse latency
3288 * @max_latency: maximum parse latency
3290 * Sets the minimum and maximum (which may likely be equal) latency introduced
3291 * by the parsing process. If there is such a latency, which depends on the
3292 * particular parsing of the format, it typically corresponds to 1 frame duration.
3297 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3298 GstClockTime max_latency)
3300 GST_OBJECT_LOCK (parse);
3301 parse->priv->min_latency = min_latency;
3302 parse->priv->max_latency = max_latency;
3303 GST_OBJECT_UNLOCK (parse);
3304 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3305 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3306 GST_TIME_ARGS (max_latency));
3310 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3311 GstClockTime * duration)
3313 gboolean res = FALSE;
3315 g_return_val_if_fail (duration != NULL, FALSE);
3317 *duration = GST_CLOCK_TIME_NONE;
3318 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3319 GST_LOG_OBJECT (parse, "using provided duration");
3320 *duration = parse->priv->duration;
3322 } else if (parse->priv->duration != -1) {
3323 GST_LOG_OBJECT (parse, "converting provided duration");
3324 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3325 parse->priv->duration, format, (gint64 *) duration);
3326 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3327 GST_LOG_OBJECT (parse, "using estimated duration");
3328 *duration = parse->priv->estimated_duration;
3332 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3333 GST_TIME_ARGS (*duration));
3338 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
3340 GstBaseParse *parse;
3341 gboolean res = FALSE;
3343 parse = GST_BASE_PARSE (parent);
3345 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3347 switch (GST_QUERY_TYPE (query)) {
3348 case GST_QUERY_POSITION:
3353 GST_DEBUG_OBJECT (parse, "position query");
3354 gst_query_parse_position (query, &format, NULL);
3356 /* try upstream first */
3357 res = gst_pad_query_default (pad, parent, query);
3359 /* Fall back on interpreting segment */
3360 GST_OBJECT_LOCK (parse);
3361 if (format == GST_FORMAT_BYTES) {
3362 dest_value = parse->priv->offset;
3364 } else if (format == parse->segment.format &&
3365 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
3366 dest_value = gst_segment_to_stream_time (&parse->segment,
3367 parse->segment.format, parse->segment.position);
3370 GST_OBJECT_UNLOCK (parse);
3372 /* no precise result, upstream no idea either, then best estimate */
3373 /* priv->offset is updated in both PUSH/PULL modes */
3374 res = gst_base_parse_convert (parse,
3375 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3378 gst_query_set_position (query, format, dest_value);
3382 case GST_QUERY_DURATION:
3385 GstClockTime duration;
3387 GST_DEBUG_OBJECT (parse, "duration query");
3388 gst_query_parse_duration (query, &format, NULL);
3390 /* consult upstream */
3391 res = gst_pad_query_default (pad, parent, query);
3393 /* otherwise best estimate from us */
3395 res = gst_base_parse_get_duration (parse, format, &duration);
3397 gst_query_set_duration (query, format, duration);
3401 case GST_QUERY_SEEKING:
3404 GstClockTime duration = GST_CLOCK_TIME_NONE;
3405 gboolean seekable = FALSE;
3407 GST_DEBUG_OBJECT (parse, "seeking query");
3408 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3410 /* consult upstream */
3411 res = gst_pad_query_default (pad, parent, query);
3413 /* we may be able to help if in TIME */
3414 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3415 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3416 /* already OK if upstream takes care */
3417 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3419 if (!(res && seekable)) {
3420 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3421 || duration == -1) {
3422 /* seekable if we still have a chance to get duration later on */
3424 parse->priv->upstream_seekable && parse->priv->update_interval;
3426 seekable = parse->priv->upstream_seekable;
3427 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3430 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3436 case GST_QUERY_FORMATS:
3437 gst_query_set_formatsv (query, 3, fmtlist);
3440 case GST_QUERY_CONVERT:
3442 GstFormat src_format, dest_format;
3443 gint64 src_value, dest_value;
3445 gst_query_parse_convert (query, &src_format, &src_value,
3446 &dest_format, &dest_value);
3448 res = gst_base_parse_convert (parse, src_format, src_value,
3449 dest_format, &dest_value);
3451 gst_query_set_convert (query, src_format, src_value,
3452 dest_format, dest_value);
3456 case GST_QUERY_LATENCY:
3458 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3460 GstClockTime min_latency, max_latency;
3462 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3463 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3464 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3465 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3467 GST_OBJECT_LOCK (parse);
3468 /* add our latency */
3469 if (min_latency != -1)
3470 min_latency += parse->priv->min_latency;
3471 if (max_latency != -1)
3472 max_latency += parse->priv->max_latency;
3473 GST_OBJECT_UNLOCK (parse);
3475 gst_query_set_latency (query, live, min_latency, max_latency);
3480 res = gst_pad_query_default (pad, parent, query);
3486 /* scans for a cluster start from @pos,
3487 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3488 static GstFlowReturn
3489 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3490 GstClockTime * time, GstClockTime * duration)
3492 GstBaseParseClass *klass;
3494 gboolean orig_drain, orig_discont;
3495 GstFlowReturn ret = GST_FLOW_OK;
3496 GstBuffer *buf = NULL;
3497 GstBaseParseFrame frame;
3499 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3500 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3501 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3503 klass = GST_BASE_PARSE_GET_CLASS (parse);
3505 *time = GST_CLOCK_TIME_NONE;
3506 *duration = GST_CLOCK_TIME_NONE;
3509 orig_offset = parse->priv->offset;
3510 orig_discont = parse->priv->discont;
3511 orig_drain = parse->priv->drain;
3513 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3514 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3516 gst_base_parse_frame_init (&frame);
3518 /* jump elsewhere and locate next frame */
3519 parse->priv->offset = *pos;
3520 ret = gst_base_parse_scan_frame (parse, klass, &frame, FALSE);
3521 if (ret != GST_FLOW_OK)
3525 GST_LOG_OBJECT (parse,
3526 "peek parsing frame at offset %" G_GUINT64_FORMAT
3527 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
3528 GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET (buf),
3529 gst_buffer_get_size (buf));
3531 /* get offset first, subclass parsing might dump other stuff in there */
3532 *pos = GST_BUFFER_OFFSET (buf);
3533 ret = klass->parse_frame (parse, &frame);
3536 /* but it should provide proper time */
3537 *time = GST_BUFFER_TIMESTAMP (buf);
3538 *duration = GST_BUFFER_DURATION (buf);
3540 gst_base_parse_frame_free (&frame);
3542 GST_LOG_OBJECT (parse,
3543 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3544 GST_TIME_ARGS (*time), *pos);
3548 parse->priv->offset = orig_offset;
3549 parse->priv->discont = orig_discont;
3550 parse->priv->drain = orig_drain;
3555 /* bisect and scan through file for frame starting before @time,
3556 * returns OK and @time/@offset if found, NONE and/or error otherwise
3557 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3558 static GstFlowReturn
3559 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3562 GstFlowReturn ret = GST_FLOW_OK;
3563 gint64 lpos, hpos, newpos;
3564 GstClockTime time, ltime, htime, newtime, dur;
3565 gboolean cont = TRUE;
3566 const GstClockTime tolerance = TARGET_DIFFERENCE;
3567 const guint chunk = 4 * 1024;
3569 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3570 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3572 GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
3573 GST_TIME_ARGS (*_time));
3575 /* TODO also make keyframe aware if useful some day */
3590 /* do not know at first */
3592 *_time = GST_CLOCK_TIME_NONE;
3594 /* need initial positions; start and end */
3595 lpos = parse->priv->first_frame_offset;
3596 ltime = parse->priv->first_frame_ts;
3597 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
3598 GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
3599 return GST_FLOW_ERROR;
3601 hpos = parse->priv->upstream_size;
3603 GST_DEBUG_OBJECT (parse,
3604 "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
3605 ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, htime,
3606 GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
3608 /* check preconditions are satisfied;
3609 * start and end are needed, except for special case where we scan for
3610 * last frame to determine duration */
3611 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
3612 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3613 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3617 /* shortcut cases */
3620 } else if (time < ltime + tolerance) {
3624 } else if (time >= htime) {
3630 while (htime > ltime && cont) {
3631 GST_LOG_OBJECT (parse,
3632 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3633 GST_TIME_ARGS (ltime));
3634 GST_LOG_OBJECT (parse,
3635 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3636 GST_TIME_ARGS (htime));
3637 if (G_UNLIKELY (time == G_MAXINT64)) {
3639 } else if (G_LIKELY (hpos > lpos)) {
3641 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3644 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3646 /* we check this case once, but not forever, so break loop */
3651 newpos = CLAMP (newpos, lpos, hpos);
3652 GST_LOG_OBJECT (parse,
3653 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3654 GST_TIME_ARGS (time), newpos);
3656 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3657 if (ret == GST_FLOW_EOS) {
3658 /* heuristic HACK */
3659 hpos = MAX (lpos, hpos - chunk);
3661 } else if (ret != GST_FLOW_OK) {
3665 if (newtime == -1 || newpos == -1) {
3666 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3670 if (G_UNLIKELY (time == G_MAXINT64)) {
3673 if (GST_CLOCK_TIME_IS_VALID (dur))
3676 } else if (newtime > time) {
3678 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3680 } else if (newtime + tolerance > time) {
3681 /* close enough undershoot */
3685 } else if (newtime < ltime) {
3686 /* so a position beyond lpos resulted in earlier time than ltime ... */
3687 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3690 /* undershoot too far */
3691 newpos += newpos == lpos ? chunk : 0;
3692 lpos = CLAMP (newpos, lpos, hpos);
3698 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3699 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3704 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3705 gboolean before, GstClockTime * _ts)
3707 gint64 bytes = 0, ts = 0;
3708 GstIndexEntry *entry = NULL;
3710 if (time == GST_CLOCK_TIME_NONE) {
3716 GST_BASE_PARSE_INDEX_LOCK (parse);
3717 if (parse->priv->index) {
3718 /* Let's check if we have an index entry for that time */
3719 entry = gst_index_get_assoc_entry (parse->priv->index,
3720 parse->priv->index_id,
3721 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3722 GST_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3726 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3727 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3729 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3730 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3731 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3733 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3734 GST_TIME_ARGS (time));
3737 ts = GST_CLOCK_TIME_NONE;
3740 GST_BASE_PARSE_INDEX_UNLOCK (parse);
3749 /* returns TRUE if seek succeeded */
3751 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3756 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3757 gboolean flush, update, res = TRUE, accurate;
3758 gint64 cur, stop, seekpos, seekstop;
3759 GstSegment seeksegment = { 0, };
3760 GstClockTime start_ts;
3762 gst_event_parse_seek (event, &rate, &format, &flags,
3763 &cur_type, &cur, &stop_type, &stop);
3765 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3766 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3767 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3768 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3770 /* no negative rates in push mode */
3771 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
3774 if (cur_type != GST_SEEK_TYPE_SET ||
3775 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3778 /* For any format other than TIME, see if upstream handles
3779 * it directly or fail. For TIME, try upstream, but do it ourselves if
3780 * it fails upstream */
3781 if (format != GST_FORMAT_TIME) {
3782 /* default action delegates to upstream */
3786 gst_event_ref (event);
3787 if ((res = gst_pad_push_event (parse->sinkpad, event))) {
3792 /* get flush flag */
3793 flush = flags & GST_SEEK_FLAG_FLUSH;
3795 /* copy segment, we need this because we still need the old
3796 * segment when we close the current segment. */
3797 gst_segment_copy_into (&parse->segment, &seeksegment);
3799 GST_DEBUG_OBJECT (parse, "configuring seek");
3800 gst_segment_do_seek (&seeksegment, rate, format, flags,
3801 cur_type, cur, stop_type, stop, &update);
3803 /* accurate seeking implies seek tables are used to obtain position,
3804 * and the requested segment is maintained exactly, not adjusted any way */
3805 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3807 /* maybe we can be accurate for (almost) free */
3808 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
3809 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
3810 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3814 GstClockTime startpos = seeksegment.position;
3816 /* accurate requested, so ... seek a bit before target */
3817 if (startpos < parse->priv->lead_in_ts)
3820 startpos -= parse->priv->lead_in_ts;
3821 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3822 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3825 start_ts = seeksegment.position;
3826 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.position,
3827 GST_FORMAT_BYTES, &seekpos))
3828 goto convert_failed;
3829 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3830 GST_FORMAT_BYTES, &seekstop))
3831 goto convert_failed;
3834 GST_DEBUG_OBJECT (parse,
3835 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3837 GST_DEBUG_OBJECT (parse,
3838 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3839 seeksegment.stop, seekstop);
3841 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
3844 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3847 if (parse->srcpad) {
3848 GST_DEBUG_OBJECT (parse, "sending flush start");
3849 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3850 /* unlock upstream pull_range */
3851 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3854 gst_pad_pause_task (parse->sinkpad);
3857 /* we should now be able to grab the streaming thread because we stopped it
3858 * with the above flush/pause code */
3859 GST_PAD_STREAM_LOCK (parse->sinkpad);
3861 /* save current position */
3862 last_stop = parse->segment.position;
3863 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3866 /* now commit to new position */
3868 /* prepare for streaming again */
3870 GST_DEBUG_OBJECT (parse, "sending flush stop");
3871 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop (TRUE));
3872 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop (TRUE));
3873 gst_base_parse_clear_queues (parse);
3875 /* keep track of our position */
3876 seeksegment.base = gst_segment_to_running_time (&seeksegment,
3877 seeksegment.format, parse->segment.position);
3880 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3882 /* store the newsegment event so it can be sent from the streaming thread. */
3883 if (parse->priv->pending_segment)
3884 gst_event_unref (parse->priv->pending_segment);
3886 /* This will be sent later in _loop() */
3887 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
3889 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3890 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3891 ", pos = %" GST_TIME_FORMAT, format,
3892 GST_TIME_ARGS (parse->segment.start),
3893 GST_TIME_ARGS (parse->segment.stop),
3894 GST_TIME_ARGS (parse->segment.start));
3896 /* one last chance in pull mode to stay accurate;
3897 * maybe scan and subclass can find where to go */
3900 GstClockTime ts = seeksegment.position;
3902 gst_base_parse_locate_time (parse, &ts, &scanpos);
3906 /* running collected index now consists of several intervals,
3907 * so optimized check no longer possible */
3908 parse->priv->index_last_valid = FALSE;
3909 parse->priv->index_last_offset = 0;
3910 parse->priv->index_last_ts = 0;
3914 /* mark discont if we are going to stream from another position. */
3915 if (seekpos != parse->priv->offset) {
3916 GST_DEBUG_OBJECT (parse,
3917 "mark DISCONT, we did a seek to another position");
3918 parse->priv->offset = seekpos;
3919 parse->priv->last_offset = seekpos;
3920 parse->priv->seen_keyframe = FALSE;
3921 parse->priv->discont = TRUE;
3922 parse->priv->next_ts = start_ts;
3923 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3924 parse->priv->sync_offset = seekpos;
3925 parse->priv->exact_position = accurate;
3928 /* Start streaming thread if paused */
3929 gst_pad_start_task (parse->sinkpad,
3930 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3932 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3937 GstEvent *new_event;
3938 GstBaseParseSeek *seek;
3939 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
3941 /* The only thing we need to do in PUSH-mode is to send the
3942 seek event (in bytes) to upstream. Segment / flush handling happens
3943 in corresponding src event handlers */
3944 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3945 if (seekstop >= 0 && seekstop <= seekpos)
3947 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
3948 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3950 /* store segment info so its precise details can be reconstructed when
3951 * receiving newsegment;
3952 * this matters for all details when accurate seeking,
3953 * is most useful to preserve NONE stop time otherwise */
3954 seek = g_new0 (GstBaseParseSeek, 1);
3955 seek->segment = seeksegment;
3956 seek->accurate = accurate;
3957 seek->offset = seekpos;
3958 seek->start_ts = start_ts;
3959 GST_OBJECT_LOCK (parse);
3960 /* less optimal, but preserves order */
3961 parse->priv->pending_seeks =
3962 g_slist_append (parse->priv->pending_seeks, seek);
3963 GST_OBJECT_UNLOCK (parse);
3965 res = gst_pad_push_event (parse->sinkpad, new_event);
3968 GST_OBJECT_LOCK (parse);
3969 parse->priv->pending_seeks =
3970 g_slist_remove (parse->priv->pending_seeks, seek);
3971 GST_OBJECT_UNLOCK (parse);
3977 /* handled event is ours to free */
3979 gst_event_unref (event);
3985 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
3991 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
3997 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
4003 /* Checks if bitrates are available from upstream tags so that we don't
4004 * override them later
4007 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
4009 GstTagList *taglist = NULL;
4012 gst_event_parse_tag (event, &taglist);
4014 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
4015 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
4016 parse->priv->post_min_bitrate = FALSE;
4018 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
4019 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
4020 parse->priv->post_avg_bitrate = FALSE;
4022 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
4023 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
4024 parse->priv->post_max_bitrate = FALSE;
4029 gst_base_parse_set_index (GstElement * element, GstIndex * index)
4031 GstBaseParse *parse = GST_BASE_PARSE (element);
4033 GST_BASE_PARSE_INDEX_LOCK (parse);
4034 if (parse->priv->index)
4035 gst_object_unref (parse->priv->index);
4037 parse->priv->index = gst_object_ref (index);
4038 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4039 &parse->priv->index_id);
4040 parse->priv->own_index = FALSE;
4042 parse->priv->index = NULL;
4044 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4048 gst_base_parse_get_index (GstElement * element)
4050 GstBaseParse *parse = GST_BASE_PARSE (element);
4051 GstIndex *result = NULL;
4053 GST_BASE_PARSE_INDEX_LOCK (parse);
4054 if (parse->priv->index)
4055 result = gst_object_ref (parse->priv->index);
4056 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4061 static GstStateChangeReturn
4062 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4064 GstBaseParse *parse;
4065 GstStateChangeReturn result;
4067 parse = GST_BASE_PARSE (element);
4069 switch (transition) {
4070 case GST_STATE_CHANGE_READY_TO_PAUSED:
4071 /* If this is our own index destroy it as the
4072 * old entries might be wrong for the new stream */
4073 GST_BASE_PARSE_INDEX_LOCK (parse);
4074 if (parse->priv->own_index) {
4075 gst_object_unref (parse->priv->index);
4076 parse->priv->index = NULL;
4077 parse->priv->own_index = FALSE;
4080 /* If no index was created, generate one */
4081 if (G_UNLIKELY (!parse->priv->index)) {
4082 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4084 parse->priv->index = gst_index_factory_make ("memindex");
4085 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4086 &parse->priv->index_id);
4087 parse->priv->own_index = TRUE;
4089 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4095 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4097 switch (transition) {
4098 case GST_STATE_CHANGE_PAUSED_TO_READY:
4099 gst_base_parse_reset (parse);