2 * Copyright (C) 2008 Nokia Corporation. All rights reserved.
3 * Contact: Stefan Kost <stefan.kost@nokia.com>
4 * Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
5 * Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
6 * Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
25 * SECTION:gstbaseparse
26 * @short_description: Base class for stream parsers
27 * @see_also: #GstBaseTransform
29 * This base class is for parser elements that process data and splits it
30 * into separate audio/video/whatever frames.
34 * <listitem><para>provides one sink pad and one source pad</para></listitem>
35 * <listitem><para>handles state changes</para></listitem>
36 * <listitem><para>can operate in pull mode or push mode</para></listitem>
37 * <listitem><para>handles seeking in both modes</para></listitem>
38 * <listitem><para>handles events (NEWSEGMENT/EOS/FLUSH)</para></listitem>
40 * handles queries (POSITION/DURATION/SEEKING/FORMAT/CONVERT)
42 * <listitem><para>handles flushing</para></listitem>
45 * The purpose of this base class is to provide the basic functionality of
46 * a parser and share a lot of rather complex code.
48 * Description of the parsing mechanism:
51 * <itemizedlist><title>Set-up phase</title>
53 * GstBaseParse calls @start to inform subclass that data processing is
57 * GstBaseParse class calls @set_sink_caps to inform the subclass about
58 * incoming sinkpad caps. Subclass could already set the srcpad caps
59 * accordingly, but this might be delayed until calling
60 * gst_base_parse_finish_frame() with a non-queued frame.
63 * At least at this point subclass needs to tell the GstBaseParse class
64 * how big data chunks it wants to receive (min_frame_size). It can do
65 * this with gst_base_parse_set_min_frame_size().
68 * GstBaseParse class sets up appropriate data passing mode (pull/push)
69 * and starts to process the data.
75 * <title>Parsing phase</title>
77 * GstBaseParse gathers at least min_frame_size bytes of data either
78 * by pulling it from upstream or collecting buffers in an internal
82 * A buffer of (at least) min_frame_size bytes is passed to subclass with
83 * @handle_frame. Subclass checks the contents and can optionally
84 * return GST_FLOW_OK along with an amount of data to be skipped to find
85 * a valid frame (which will result in a subsequent DISCONT).
86 * If, otherwise, the buffer does not hold a complete frame,
87 * @handle_frame can merely return and will be called again when additional
88 * data is available. In push mode this amounts to an
89 * additional input buffer (thus minimal additional latency), in pull mode
90 * this amounts to some arbitrary reasonable buffer size increase.
91 * Of course, gst_base_parse_set_min_size() could also be used if a very
92 * specific known amount of additional data is required.
93 * If, however, the buffer holds a complete valid frame, it can pass
94 * the size of this frame to gst_base_parse_finish_frame().
95 * If acting as a converter, it can also merely indicate consumed input data
96 * while simultaneously providing custom output data.
97 * Note that baseclass performs some processing (such as tracking
98 * overall consumed data rate versus duration) for each finished frame,
99 * but other state is only updated upon each call to @handle_frame
100 * (such as tracking upstream input timestamp).
102 * Subclass is also responsible for setting the buffer metadata
103 * (e.g. buffer timestamp and duration, or keyframe if applicable).
104 * (although the latter can also be done by GstBaseParse if it is
105 * appropriately configured, see below). Frame is provided with
106 * timestamp derived from upstream (as much as generally possible),
107 * duration obtained from configuration (see below), and offset
108 * if meaningful (in pull mode).
110 * Note that @check_valid_frame might receive any small
111 * amount of input data when leftover data is being drained (e.g. at EOS).
114 * As part of finish frame processing,
115 * just prior to actually pushing the buffer in question,
116 * it is passed to @pre_push_frame which gives subclass yet one
117 * last chance to examine buffer metadata, or to send some custom (tag)
118 * events, or to perform custom (segment) filtering.
121 * During the parsing process GstBaseParseClass will handle both srcpad
122 * and sinkpad events. They will be passed to subclass if @event or
123 * @src_event callbacks have been provided.
128 * <itemizedlist><title>Shutdown phase</title>
130 * GstBaseParse class calls @stop to inform the subclass that data
131 * parsing will be stopped.
137 * Subclass is responsible for providing pad template caps for
138 * source and sink pads. The pads need to be named "sink" and "src". It also
139 * needs to set the fixed caps on srcpad, when the format is ensured (e.g.
140 * when base class calls subclass' @set_sink_caps function).
142 * This base class uses #GST_FORMAT_DEFAULT as a meaning of frames. So,
143 * subclass conversion routine needs to know that conversion from
144 * #GST_FORMAT_TIME to #GST_FORMAT_DEFAULT must return the
145 * frame number that can be found from the given byte position.
147 * GstBaseParse uses subclasses conversion methods also for seeking (or
148 * otherwise uses its own default one, see also below).
150 * Subclass @start and @stop functions will be called to inform the beginning
151 * and end of data processing.
153 * Things that subclass need to take care of:
155 * <listitem><para>Provide pad templates</para></listitem>
157 * Fixate the source pad caps when appropriate
160 * Inform base class how big data chunks should be retrieved. This is
161 * done with gst_base_parse_set_min_frame_size() function.
164 * Examine data chunks passed to subclass with @handle_frame and pass
165 * proper frame(s) to gst_base_parse_finish_frame(), and setting src pad
166 * caps and timestamps on frame.
168 * <listitem><para>Provide conversion functions</para></listitem>
170 * Update the duration information with gst_base_parse_set_duration()
173 * Optionally passthrough using gst_base_parse_set_passthrough()
176 * Configure various baseparse parameters using
177 * gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
178 * and gst_base_parse_set_frame_rate().
181 * In particular, if subclass is unable to determine a duration, but
182 * parsing (or specs) yields a frames per seconds rate, then this can be
183 * provided to GstBaseParse to enable it to cater for
184 * buffer time metadata (which will be taken from upstream as much as
185 * possible). Internally keeping track of frame durations and respective
186 * sizes that have been pushed provides GstBaseParse with an estimated
187 * bitrate. A default @convert (used if not overriden) will then use these
188 * rates to perform obvious conversions. These rates are also used to
189 * update (estimated) duration at regular frame intervals.
196 * - In push mode provide a queue of adapter-"queued" buffers for upstream
198 * - Queue buffers/events until caps are set
208 #include <gst/base/gstadapter.h>
210 #include "gstbaseparse.h"
212 /* FIXME: get rid of old GstIndex code */
213 #include "gstindex.h"
214 #include "gstindex.c"
215 #include "gstmemindex.c"
217 #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
219 #define MIN_FRAMES_TO_POST_BITRATE 10
220 #define TARGET_DIFFERENCE (20 * GST_SECOND)
222 GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
223 #define GST_CAT_DEFAULT gst_base_parse_debug
225 /* Supported formats */
226 static const GstFormat fmtlist[] = {
233 #define GST_BASE_PARSE_GET_PRIVATE(obj) \
234 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
236 struct _GstBaseParsePrivate
243 GstFormat duration_fmt;
244 gint64 estimated_duration;
245 gint64 estimated_drift;
247 guint min_frame_size;
248 gboolean passthrough;
250 gboolean has_timing_info;
251 guint fps_num, fps_den;
252 gint update_interval;
254 guint lead_in, lead_out;
255 GstClockTime lead_in_ts, lead_out_ts;
256 GstClockTime min_latency, max_latency;
264 GstClockTime next_ts;
265 GstClockTime prev_ts;
266 GstClockTime frame_duration;
267 gboolean seen_keyframe;
273 guint64 data_bytecount;
274 guint64 acc_duration;
275 GstClockTime first_frame_ts;
276 gint64 first_frame_offset;
278 gboolean post_min_bitrate;
279 gboolean post_avg_bitrate;
280 gboolean post_max_bitrate;
284 guint posted_avg_bitrate;
286 /* frames/buffers that are queued and ready to go on OK */
287 GQueue queued_frames;
291 /* index entry storage, either ours or provided */
297 /* seek table entries only maintained if upstream is BYTE seekable */
298 gboolean upstream_seekable;
299 gboolean upstream_has_duration;
300 gint64 upstream_size;
301 /* minimum distance between two index entries */
302 GstClockTimeDiff idx_interval;
303 /* ts and offset of last entry added */
304 GstClockTime index_last_ts;
305 gint64 index_last_offset;
306 gboolean index_last_valid;
308 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
309 gboolean exact_position;
310 /* seek events are temporarily kept to match them with newsegments */
311 GSList *pending_seeks;
313 /* reverse playback */
314 GSList *buffers_pending;
315 GSList *buffers_head;
316 GSList *buffers_queued;
317 GSList *buffers_send;
318 GstClockTime last_ts;
321 /* Pending serialized events */
322 GList *pending_events;
323 /* Newsegment event to be sent after SEEK */
324 gboolean pending_segment;
326 /* offset of last parsed frame/data */
328 /* force a new frame, regardless of offset */
330 /* whether we are merely scanning for a frame */
332 /* ... and resulting frame, if any */
333 GstBaseParseFrame *scanned_frame;
335 /* TRUE if we're still detecting the format, i.e.
336 * if ::detect() is still called for future buffers */
338 GList *detect_buffers;
339 guint detect_buffers_size;
342 typedef struct _GstBaseParseSeek
347 GstClockTime start_ts;
350 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
351 g_mutex_lock (&parse->priv->index_lock);
352 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
353 g_mutex_unlock (&parse->priv->index_lock);
355 static GstElementClass *parent_class = NULL;
357 static void gst_base_parse_class_init (GstBaseParseClass * klass);
358 static void gst_base_parse_init (GstBaseParse * parse,
359 GstBaseParseClass * klass);
362 gst_base_parse_get_type (void)
364 static volatile gsize base_parse_type = 0;
366 if (g_once_init_enter (&base_parse_type)) {
367 static const GTypeInfo base_parse_info = {
368 sizeof (GstBaseParseClass),
369 (GBaseInitFunc) NULL,
370 (GBaseFinalizeFunc) NULL,
371 (GClassInitFunc) gst_base_parse_class_init,
374 sizeof (GstBaseParse),
376 (GInstanceInitFunc) gst_base_parse_init,
380 _type = g_type_register_static (GST_TYPE_ELEMENT,
381 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
382 g_once_init_leave (&base_parse_type, _type);
384 return (GType) base_parse_type;
387 static void gst_base_parse_finalize (GObject * object);
389 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
390 GstStateChange transition);
391 static void gst_base_parse_reset (GstBaseParse * parse);
394 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
395 static GstIndex *gst_base_parse_get_index (GstElement * element);
398 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
400 static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
401 GstObject * parent, GstPadMode mode, gboolean active);
402 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
404 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
406 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
408 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
411 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
413 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
416 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
418 static void gst_base_parse_loop (GstPad * pad);
420 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
421 GstBaseParseFrame * frame);
423 static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse,
426 static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse,
429 static void gst_base_parse_drain (GstBaseParse * parse);
431 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
432 gboolean post_min, gboolean post_avg, gboolean post_max);
434 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
435 GstClockTime time, gboolean before, GstClockTime * _ts);
436 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
437 GstClockTime * _time, gint64 * _offset);
439 static GstFlowReturn gst_base_parse_start_fragment (GstBaseParse * parse);
440 static GstFlowReturn gst_base_parse_finish_fragment (GstBaseParse * parse,
443 static inline GstFlowReturn gst_base_parse_check_sync (GstBaseParse * parse);
445 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
448 gst_base_parse_clear_queues (GstBaseParse * parse)
450 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
451 g_slist_free (parse->priv->buffers_queued);
452 parse->priv->buffers_queued = NULL;
453 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
455 g_slist_free (parse->priv->buffers_pending);
456 parse->priv->buffers_pending = NULL;
457 g_slist_foreach (parse->priv->buffers_head, (GFunc) gst_buffer_unref, NULL);
458 g_slist_free (parse->priv->buffers_head);
459 parse->priv->buffers_head = NULL;
460 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
461 g_slist_free (parse->priv->buffers_send);
462 parse->priv->buffers_send = NULL;
464 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
465 g_list_free (parse->priv->detect_buffers);
466 parse->priv->detect_buffers = NULL;
467 parse->priv->detect_buffers_size = 0;
469 g_queue_foreach (&parse->priv->queued_frames,
470 (GFunc) gst_base_parse_frame_free, NULL);
471 g_queue_clear (&parse->priv->queued_frames);
473 gst_buffer_replace (&parse->priv->cache, NULL);
475 g_list_foreach (parse->priv->pending_events, (GFunc) gst_event_unref, NULL);
476 g_list_free (parse->priv->pending_events);
477 parse->priv->pending_events = NULL;
478 parse->priv->pending_segment = FALSE;
480 gst_event_replace (&parse->priv->close_segment, NULL);
484 gst_base_parse_finalize (GObject * object)
486 GstBaseParse *parse = GST_BASE_PARSE (object);
489 g_object_unref (parse->priv->adapter);
491 if (parse->priv->cache) {
492 gst_buffer_unref (parse->priv->cache);
493 parse->priv->cache = NULL;
496 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
498 g_list_free (parse->priv->pending_events);
499 parse->priv->pending_events = NULL;
500 parse->priv->pending_segment = FALSE;
502 if (parse->priv->index) {
503 gst_object_unref (parse->priv->index);
504 parse->priv->index = NULL;
506 g_mutex_clear (&parse->priv->index_lock);
508 gst_base_parse_clear_queues (parse);
510 G_OBJECT_CLASS (parent_class)->finalize (object);
514 gst_base_parse_class_init (GstBaseParseClass * klass)
516 GObjectClass *gobject_class;
517 GstElementClass *gstelement_class;
519 gobject_class = G_OBJECT_CLASS (klass);
520 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
521 parent_class = g_type_class_peek_parent (klass);
522 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
524 gstelement_class = (GstElementClass *) klass;
525 gstelement_class->change_state =
526 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
529 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
530 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
533 /* Default handlers */
534 klass->event = gst_base_parse_sink_eventfunc;
535 klass->src_event = gst_base_parse_src_eventfunc;
536 klass->convert = gst_base_parse_convert_default;
538 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
539 "baseparse element");
543 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
545 GstPadTemplate *pad_template;
547 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
549 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
552 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
553 g_return_if_fail (pad_template != NULL);
554 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
555 gst_pad_set_event_function (parse->sinkpad,
556 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
557 gst_pad_set_query_function (parse->sinkpad,
558 GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
559 gst_pad_set_chain_function (parse->sinkpad,
560 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
561 gst_pad_set_activate_function (parse->sinkpad,
562 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
563 gst_pad_set_activatemode_function (parse->sinkpad,
564 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
565 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
567 GST_DEBUG_OBJECT (parse, "sinkpad created");
570 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
571 g_return_if_fail (pad_template != NULL);
572 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
573 gst_pad_set_event_function (parse->srcpad,
574 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
575 gst_pad_set_query_function (parse->srcpad,
576 GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
577 gst_pad_use_fixed_caps (parse->srcpad);
578 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
579 GST_DEBUG_OBJECT (parse, "src created");
581 g_queue_init (&parse->priv->queued_frames);
583 parse->priv->adapter = gst_adapter_new ();
585 parse->priv->pad_mode = GST_PAD_MODE_NONE;
587 g_mutex_init (&parse->priv->index_lock);
590 gst_base_parse_reset (parse);
591 GST_DEBUG_OBJECT (parse, "init ok");
593 GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE);
596 static GstBaseParseFrame *
597 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
599 GstBaseParseFrame *copy;
601 copy = g_slice_dup (GstBaseParseFrame, frame);
602 copy->buffer = gst_buffer_ref (frame->buffer);
603 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
605 GST_TRACE ("copied frame %p -> %p", frame, copy);
611 gst_base_parse_frame_free (GstBaseParseFrame * frame)
613 GST_TRACE ("freeing frame %p", frame);
616 gst_buffer_unref (frame->buffer);
617 frame->buffer = NULL;
620 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
621 g_slice_free (GstBaseParseFrame, frame);
623 memset (frame, 0, sizeof (*frame));
627 G_DEFINE_BOXED_TYPE (GstBaseParseFrame, gst_base_parse_frame,
628 (GBoxedCopyFunc) gst_base_parse_frame_copy,
629 (GBoxedFreeFunc) gst_base_parse_frame_free);
632 * gst_base_parse_frame_init:
633 * @frame: #GstBaseParseFrame.
635 * Sets a #GstBaseParseFrame to initial state. Currently this means
636 * all public fields are zero-ed and a private flag is set to make
637 * sure gst_base_parse_frame_free() only frees the contents but not
638 * the actual frame. Use this function to initialise a #GstBaseParseFrame
639 * allocated on the stack.
644 gst_base_parse_frame_init (GstBaseParseFrame * frame)
646 memset (frame, 0, sizeof (GstBaseParseFrame));
647 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
648 GST_TRACE ("inited frame %p", frame);
652 * gst_base_parse_frame_new:
653 * @buffer: (transfer none): a #GstBuffer
655 * @overhead: number of bytes in this frame which should be counted as
656 * metadata overhead, ie. not used to calculate the average bitrate.
657 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
659 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
660 * elements written in C should usually allocate the frame on the stack and
661 * then use gst_base_parse_frame_init() to initialise it.
663 * Returns: a newly-allocated #GstBaseParseFrame. Free with
664 * gst_base_parse_frame_free() when no longer needed.
669 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
672 GstBaseParseFrame *frame;
674 frame = g_slice_new0 (GstBaseParseFrame);
675 frame->buffer = gst_buffer_ref (buffer);
677 GST_TRACE ("created frame %p", frame);
682 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
685 gst_buffer_replace (&frame->buffer, buf);
689 /* set flags one by one for clarity */
690 if (G_UNLIKELY (parse->priv->drain))
691 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
693 /* losing sync is pretty much a discont (and vice versa), no ? */
694 if (G_UNLIKELY (parse->priv->discont))
695 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
699 gst_base_parse_reset (GstBaseParse * parse)
701 GST_OBJECT_LOCK (parse);
702 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
703 parse->priv->duration = -1;
704 parse->priv->min_frame_size = 1;
705 parse->priv->discont = TRUE;
706 parse->priv->flushing = FALSE;
707 parse->priv->offset = 0;
708 parse->priv->sync_offset = 0;
709 parse->priv->update_interval = -1;
710 parse->priv->fps_num = parse->priv->fps_den = 0;
711 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
712 parse->priv->lead_in = parse->priv->lead_out = 0;
713 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
714 parse->priv->bitrate = 0;
715 parse->priv->framecount = 0;
716 parse->priv->bytecount = 0;
717 parse->priv->acc_duration = 0;
718 parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE;
719 parse->priv->first_frame_offset = -1;
720 parse->priv->estimated_duration = -1;
721 parse->priv->estimated_drift = 0;
722 parse->priv->next_ts = 0;
723 parse->priv->syncable = TRUE;
724 parse->priv->passthrough = FALSE;
725 parse->priv->has_timing_info = FALSE;
726 parse->priv->post_min_bitrate = TRUE;
727 parse->priv->post_avg_bitrate = TRUE;
728 parse->priv->post_max_bitrate = TRUE;
729 parse->priv->min_bitrate = G_MAXUINT;
730 parse->priv->max_bitrate = 0;
731 parse->priv->avg_bitrate = 0;
732 parse->priv->posted_avg_bitrate = 0;
734 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
735 parse->priv->index_last_offset = -1;
736 parse->priv->index_last_valid = TRUE;
737 parse->priv->upstream_seekable = FALSE;
738 parse->priv->upstream_size = 0;
739 parse->priv->upstream_has_duration = FALSE;
740 parse->priv->idx_interval = 0;
741 parse->priv->exact_position = TRUE;
742 parse->priv->seen_keyframe = FALSE;
744 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
745 parse->priv->last_offset = 0;
747 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
749 g_list_free (parse->priv->pending_events);
750 parse->priv->pending_events = NULL;
751 parse->priv->pending_segment = FALSE;
753 gst_event_replace (&parse->priv->close_segment, NULL);
755 if (parse->priv->cache) {
756 gst_buffer_unref (parse->priv->cache);
757 parse->priv->cache = NULL;
760 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
761 g_slist_free (parse->priv->pending_seeks);
762 parse->priv->pending_seeks = NULL;
764 if (parse->priv->adapter)
765 gst_adapter_clear (parse->priv->adapter);
767 parse->priv->new_frame = TRUE;
769 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
770 g_list_free (parse->priv->detect_buffers);
771 parse->priv->detect_buffers = NULL;
772 parse->priv->detect_buffers_size = 0;
773 GST_OBJECT_UNLOCK (parse);
776 /* gst_base_parse_parse_frame:
777 * @parse: #GstBaseParse.
778 * @buffer: #GstBuffer.
780 * Default callback for parse_frame.
783 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
785 GstBuffer *buffer = frame->buffer;
787 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
788 GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) {
789 GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts;
791 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
792 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
793 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
798 /* gst_base_parse_convert:
799 * @parse: #GstBaseParse.
800 * @src_format: #GstFormat describing the source format.
801 * @src_value: Source value to be converted.
802 * @dest_format: #GstFormat defining the converted format.
803 * @dest_value: Pointer where the conversion result will be put.
805 * Converts using configured "convert" vmethod in #GstBaseParse class.
807 * Returns: TRUE if conversion was successful.
810 gst_base_parse_convert (GstBaseParse * parse,
811 GstFormat src_format,
812 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
814 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
817 g_return_val_if_fail (dest_value != NULL, FALSE);
822 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
824 #ifndef GST_DISABLE_GST_DEBUG
827 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
828 GST_LOG_OBJECT (parse,
829 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
830 GST_TIME_ARGS (src_value), *dest_value);
831 } else if (dest_format == GST_FORMAT_TIME &&
832 src_format == GST_FORMAT_BYTES) {
833 GST_LOG_OBJECT (parse,
834 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
835 src_value, GST_TIME_ARGS (*dest_value));
837 GST_LOG_OBJECT (parse,
838 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
839 GST_STR_NULL (gst_format_get_name (src_format)),
840 GST_STR_NULL (gst_format_get_name (dest_format)),
841 src_value, *dest_value);
844 GST_DEBUG_OBJECT (parse, "conversion failed");
852 /* gst_base_parse_sink_event:
853 * @pad: #GstPad that received the event.
854 * @event: #GstEvent to be handled.
856 * Handler for sink pad events.
858 * Returns: TRUE if the event was handled.
861 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
864 GstBaseParseClass *bclass;
867 parse = GST_BASE_PARSE (parent);
868 bclass = GST_BASE_PARSE_GET_CLASS (parse);
870 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
871 GST_EVENT_TYPE_NAME (event));
873 /* Cache all serialized events except EOS, SEGMENT and FLUSH_STOP if we have a
875 if (parse->priv->pending_segment && GST_EVENT_IS_SERIALIZED (event)
876 && GST_EVENT_TYPE (event) != GST_EVENT_EOS
877 && GST_EVENT_TYPE (event) != GST_EVENT_SEGMENT
878 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
879 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP
880 && GST_EVENT_TYPE (event) != GST_EVENT_CAPS) {
882 if (GST_EVENT_TYPE (event) == GST_EVENT_TAG)
883 /* See if any bitrate tags were posted */
884 gst_base_parse_handle_tag (parse, event);
886 parse->priv->pending_events =
887 g_list_append (parse->priv->pending_events, event);
890 if (GST_EVENT_TYPE (event) == GST_EVENT_EOS &&
891 parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
892 /* We've not posted bitrate tags yet - do so now */
893 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
896 ret = bclass->event (parse, event);
898 gst_event_unref (event);
903 GST_DEBUG_OBJECT (parse, "event handled");
909 /* gst_base_parse_sink_eventfunc:
910 * @parse: #GstBaseParse.
911 * @event: #GstEvent to be handled.
913 * Element-level event handler function.
915 * The event will be unreffed only if it has been handled and this
916 * function returns %TRUE
918 * Returns: %TRUE if the event was handled and not need forwarding.
921 gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event)
925 switch (GST_EVENT_TYPE (event)) {
929 GstBaseParseClass *klass;
931 klass = GST_BASE_PARSE_GET_CLASS (parse);
933 gst_event_parse_caps (event, &caps);
934 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
936 if (klass->set_sink_caps)
937 ret = klass->set_sink_caps (parse, caps);
941 /* will send our own caps downstream */
942 gst_event_unref (event);
945 case GST_EVENT_SEGMENT:
947 const GstSegment *in_segment;
948 GstSegment out_segment;
949 gint64 offset = 0, next_ts;
952 gdouble rate, applied_rate;
954 gint64 start, stop, pos, next_ts;
958 gst_event_parse_segment (event, &in_segment);
959 gst_segment_init (&out_segment, GST_FORMAT_TIME);
961 GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
963 if (in_segment->format == GST_FORMAT_BYTES) {
964 GstBaseParseSeek *seek = NULL;
967 /* stop time is allowed to be open-ended, but not start & pos */
968 offset = in_segment->time;
970 GST_OBJECT_LOCK (parse);
971 for (node = parse->priv->pending_seeks; node; node = node->next) {
972 GstBaseParseSeek *tmp = node->data;
974 if (tmp->offset == offset) {
979 parse->priv->pending_seeks =
980 g_slist_remove (parse->priv->pending_seeks, seek);
981 GST_OBJECT_UNLOCK (parse);
984 GST_DEBUG_OBJECT (parse,
985 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
986 seek->accurate ? " accurate" : "", &seek->segment);
988 out_segment.start = seek->segment.start;
989 out_segment.stop = seek->segment.stop;
990 out_segment.time = seek->segment.start;
992 next_ts = seek->start_ts;
993 parse->priv->exact_position = seek->accurate;
996 /* best attempt convert */
997 /* as these are only estimates, stop is kept open-ended to avoid
998 * premature cutting */
999 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
1000 GST_FORMAT_TIME, (gint64 *) & next_ts);
1002 out_segment.start = next_ts;
1003 out_segment.stop = GST_CLOCK_TIME_NONE;
1004 out_segment.time = next_ts;
1006 parse->priv->exact_position = (in_segment->start == 0);
1009 gst_event_unref (event);
1011 event = gst_event_new_segment (&out_segment);
1013 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1014 GST_SEGMENT_FORMAT, in_segment);
1016 } else if (in_segment->format != GST_FORMAT_TIME) {
1017 /* Unknown incoming segment format. Output a default open-ended
1019 gst_event_unref (event);
1021 out_segment.start = 0;
1022 out_segment.stop = GST_CLOCK_TIME_NONE;
1023 out_segment.time = 0;
1025 event = gst_event_new_segment (&out_segment);
1029 /* not considered BYTE seekable if it is talking to us in TIME,
1030 * whatever else it might claim */
1031 parse->priv->upstream_seekable = FALSE;
1032 next_ts = in_segment->start;
1035 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1038 gst_segment_set_newsegment (&parse->segment, update, rate,
1039 applied_rate, format, start, stop, start);
1042 /* save the segment for later, right before we push a new buffer so that
1043 * the caps are fixed and the next linked element can receive
1045 parse->priv->pending_events =
1046 g_list_append (parse->priv->pending_events, event);
1047 parse->priv->pending_segment = TRUE;
1050 /* but finish the current segment */
1051 GST_DEBUG_OBJECT (parse, "draining current segment");
1052 if (in_segment->rate > 0.0)
1053 gst_base_parse_drain (parse);
1055 gst_base_parse_finish_fragment (parse, FALSE);
1056 gst_adapter_clear (parse->priv->adapter);
1058 parse->priv->offset = offset;
1059 parse->priv->sync_offset = offset;
1060 parse->priv->next_ts = next_ts;
1061 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1062 parse->priv->discont = TRUE;
1063 parse->priv->seen_keyframe = FALSE;
1067 case GST_EVENT_FLUSH_START:
1068 parse->priv->flushing = TRUE;
1069 ret = gst_pad_push_event (parse->srcpad, event);
1070 /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
1071 GST_PAD_STREAM_LOCK (parse->srcpad);
1072 GST_PAD_STREAM_UNLOCK (parse->srcpad);
1075 case GST_EVENT_FLUSH_STOP:
1076 ret = gst_pad_push_event (parse->srcpad, event);
1077 gst_adapter_clear (parse->priv->adapter);
1078 gst_base_parse_clear_queues (parse);
1079 parse->priv->flushing = FALSE;
1080 parse->priv->discont = TRUE;
1081 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1082 parse->priv->new_frame = TRUE;
1086 if (parse->segment.rate > 0.0)
1087 gst_base_parse_drain (parse);
1089 gst_base_parse_finish_fragment (parse, TRUE);
1091 /* If we STILL have zero frames processed, fire an error */
1092 if (parse->priv->framecount == 0) {
1093 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1094 ("No valid frames found before end of stream"), (NULL));
1096 /* newsegment and other serialized events before eos */
1097 if (G_UNLIKELY (parse->priv->pending_events)) {
1100 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
1101 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
1103 g_list_free (parse->priv->pending_events);
1104 parse->priv->pending_events = NULL;
1105 parse->priv->pending_segment = FALSE;
1107 ret = gst_pad_push_event (parse->srcpad, event);
1112 gst_pad_event_default (parse->sinkpad, GST_OBJECT_CAST (parse),
1120 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1122 GstBaseParse *parse;
1123 GstBaseParseClass *bclass;
1126 parse = GST_BASE_PARSE (parent);
1127 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1129 switch (GST_QUERY_TYPE (query)) {
1130 case GST_QUERY_CAPS:
1132 if (bclass->get_sink_caps) {
1133 GstCaps *caps, *filter;
1135 gst_query_parse_caps (query, &filter);
1136 caps = bclass->get_sink_caps (parse, filter);
1137 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1139 gst_query_set_caps_result (query, caps);
1140 gst_caps_unref (caps);
1144 GstCaps *caps, *template_caps, *filter;
1146 gst_query_parse_caps (query, &filter);
1147 template_caps = gst_pad_get_pad_template_caps (pad);
1148 if (filter != NULL) {
1150 gst_caps_intersect_full (filter, template_caps,
1151 GST_CAPS_INTERSECT_FIRST);
1152 gst_caps_unref (template_caps);
1154 caps = template_caps;
1156 gst_query_set_caps_result (query, caps);
1157 gst_caps_unref (caps);
1165 res = gst_pad_query_default (pad, parent, query);
1174 /* gst_base_parse_src_event:
1175 * @pad: #GstPad that received the event.
1176 * @event: #GstEvent that was received.
1178 * Handler for source pad events.
1180 * Returns: TRUE if the event was handled.
1183 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1185 GstBaseParse *parse;
1186 GstBaseParseClass *bclass;
1187 gboolean ret = TRUE;
1189 parse = GST_BASE_PARSE (parent);
1190 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1192 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1193 GST_EVENT_TYPE_NAME (event));
1195 if (bclass->src_event)
1196 ret = bclass->src_event (parse, event);
1198 gst_event_unref (event);
1204 gst_base_parse_is_seekable (GstBaseParse * parse)
1206 /* FIXME: could do more here, e.g. check index or just send data from 0
1207 * in pull mode and let decoder/sink clip */
1208 return parse->priv->syncable;
1211 /* gst_base_parse_src_eventfunc:
1212 * @parse: #GstBaseParse.
1213 * @event: #GstEvent that was received.
1215 * Default srcpad event handler.
1217 * Returns: TRUE if the event was handled and can be dropped.
1220 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1222 gboolean res = FALSE;
1224 switch (GST_EVENT_TYPE (event)) {
1225 case GST_EVENT_SEEK:
1226 if (gst_base_parse_is_seekable (parse))
1227 res = gst_base_parse_handle_seek (parse, event);
1230 res = gst_pad_event_default (parse->srcpad, GST_OBJECT_CAST (parse),
1239 * gst_base_parse_convert_default:
1240 * @parse: #GstBaseParse.
1241 * @src_format: #GstFormat describing the source format.
1242 * @src_value: Source value to be converted.
1243 * @dest_format: #GstFormat defining the converted format.
1244 * @dest_value: Pointer where the conversion result will be put.
1246 * Default implementation of "convert" vmethod in #GstBaseParse class.
1248 * Returns: TRUE if conversion was successful.
1253 gst_base_parse_convert_default (GstBaseParse * parse,
1254 GstFormat src_format,
1255 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1257 gboolean ret = FALSE;
1258 guint64 bytes, duration;
1260 if (G_UNLIKELY (src_format == dest_format)) {
1261 *dest_value = src_value;
1265 if (G_UNLIKELY (src_value == -1)) {
1270 if (G_UNLIKELY (src_value == 0)) {
1275 /* need at least some frames */
1276 if (!parse->priv->framecount)
1279 duration = parse->priv->acc_duration / GST_MSECOND;
1280 bytes = parse->priv->bytecount;
1282 if (G_UNLIKELY (!duration || !bytes))
1283 goto no_duration_bytes;
1285 if (src_format == GST_FORMAT_BYTES) {
1286 if (dest_format == GST_FORMAT_TIME) {
1287 /* BYTES -> TIME conversion */
1288 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1289 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1290 *dest_value *= GST_MSECOND;
1291 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1292 *dest_value / GST_MSECOND);
1295 GST_DEBUG_OBJECT (parse, "converting bytes -> other not implemented");
1297 } else if (src_format == GST_FORMAT_TIME) {
1298 if (dest_format == GST_FORMAT_BYTES) {
1299 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1300 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1302 GST_DEBUG_OBJECT (parse,
1303 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1304 src_value / GST_MSECOND, *dest_value);
1307 GST_DEBUG_OBJECT (parse, "converting time -> other not implemented");
1309 } else if (src_format == GST_FORMAT_DEFAULT) {
1310 /* DEFAULT == frame-based */
1311 if (dest_format == GST_FORMAT_TIME) {
1312 GST_DEBUG_OBJECT (parse, "converting default -> time");
1313 if (parse->priv->fps_den) {
1314 *dest_value = gst_util_uint64_scale (src_value,
1315 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1319 GST_DEBUG_OBJECT (parse, "converting default -> other not implemented");
1322 GST_DEBUG_OBJECT (parse, "conversion not implemented");
1329 GST_DEBUG_OBJECT (parse, "no framecount");
1334 GST_DEBUG_OBJECT (parse, "no duration %" G_GUINT64_FORMAT ", bytes %"
1335 G_GUINT64_FORMAT, duration, bytes);
1342 gst_base_parse_update_duration (GstBaseParse * baseparse)
1345 GstBaseParse *parse;
1347 parse = GST_BASE_PARSE (baseparse);
1349 peer = gst_pad_get_peer (parse->sinkpad);
1351 gboolean qres = FALSE;
1352 gint64 ptot, dest_value;
1354 qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot);
1355 gst_object_unref (GST_OBJECT (peer));
1357 if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1358 GST_FORMAT_TIME, &dest_value)) {
1360 /* inform if duration changed, but try to avoid spamming */
1361 parse->priv->estimated_drift +=
1362 dest_value - parse->priv->estimated_duration;
1363 if (parse->priv->estimated_drift > GST_SECOND ||
1364 parse->priv->estimated_drift < -GST_SECOND) {
1365 gst_element_post_message (GST_ELEMENT (parse),
1366 gst_message_new_duration (GST_OBJECT (parse),
1367 GST_FORMAT_TIME, dest_value));
1368 parse->priv->estimated_drift = 0;
1370 parse->priv->estimated_duration = dest_value;
1371 GST_LOG_OBJECT (parse,
1372 "updated estimated duration to %" GST_TIME_FORMAT,
1373 GST_TIME_ARGS (dest_value));
1380 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1381 gboolean post_avg, gboolean post_max)
1383 GstTagList *taglist = NULL;
1385 if (post_min && parse->priv->post_min_bitrate) {
1386 taglist = gst_tag_list_new_empty ();
1388 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1389 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1392 if (post_avg && parse->priv->post_avg_bitrate) {
1393 if (taglist == NULL)
1394 taglist = gst_tag_list_new_empty ();
1396 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1397 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1398 parse->priv->avg_bitrate, NULL);
1401 if (post_max && parse->priv->post_max_bitrate) {
1402 if (taglist == NULL)
1403 taglist = gst_tag_list_new_empty ();
1405 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1406 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1409 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1410 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1411 parse->priv->max_bitrate);
1413 if (taglist != NULL) {
1414 gst_pad_push_event (parse->srcpad, gst_event_new_tag (taglist));
1418 /* gst_base_parse_update_bitrates:
1419 * @parse: #GstBaseParse.
1420 * @buffer: Current frame as a #GstBuffer
1422 * Keeps track of the minimum and maximum bitrates, and also maintains a
1423 * running average bitrate of the stream so far.
1426 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1428 /* Only update the tag on a 10 kbps delta */
1429 static const gint update_threshold = 10000;
1431 guint64 data_len, frame_dur;
1432 gint overhead, frame_bitrate, old_avg_bitrate;
1433 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1434 GstBuffer *buffer = frame->buffer;
1436 overhead = frame->overhead;
1440 data_len = gst_buffer_get_size (buffer) - overhead;
1441 parse->priv->data_bytecount += data_len;
1443 /* duration should be valid by now,
1444 * either set by subclass or maybe based on fps settings */
1445 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1446 /* Calculate duration of a frame from buffer properties */
1447 frame_dur = GST_BUFFER_DURATION (buffer);
1448 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1449 parse->priv->acc_duration;
1452 /* No way to figure out frame duration (is this even possible?) */
1456 /* override if subclass provided bitrate, e.g. metadata based */
1457 if (parse->priv->bitrate) {
1458 parse->priv->avg_bitrate = parse->priv->bitrate;
1459 /* spread this (confirmed) info ASAP */
1460 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1461 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1465 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1469 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1470 parse->priv->avg_bitrate);
1472 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1474 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1475 /* always post all at threshold time */
1476 update_min = update_max = update_avg = TRUE;
1479 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1480 if (frame_bitrate < parse->priv->min_bitrate) {
1481 parse->priv->min_bitrate = frame_bitrate;
1485 if (frame_bitrate > parse->priv->max_bitrate) {
1486 parse->priv->max_bitrate = frame_bitrate;
1490 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1491 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1492 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1497 if ((update_min || update_avg || update_max))
1498 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1505 * gst_base_parse_add_index_entry:
1506 * @parse: #GstBaseParse.
1507 * @offset: offset of entry
1508 * @ts: timestamp associated with offset
1509 * @key: whether entry refers to keyframe
1510 * @force: add entry disregarding sanity checks
1512 * Adds an entry to the index associating @offset to @ts. It is recommended
1513 * to only add keyframe entries. @force allows to bypass checks, such as
1514 * whether the stream is (upstream) seekable, another entry is already "close"
1515 * to the new entry, etc.
1517 * Returns: #gboolean indicating whether entry was added
1522 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1523 GstClockTime ts, gboolean key, gboolean force)
1525 gboolean ret = FALSE;
1526 GstIndexAssociation associations[2];
1528 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1529 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1531 if (G_LIKELY (!force)) {
1533 if (!parse->priv->upstream_seekable) {
1534 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1538 /* FIXME need better helper data structure that handles these issues
1539 * related to ongoing collecting of index entries */
1540 if (parse->priv->index_last_offset >= (gint64) offset) {
1541 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1542 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1546 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1547 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1548 parse->priv->idx_interval) {
1549 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1550 GST_TIME_ARGS (parse->priv->index_last_ts));
1554 /* if last is not really the last one */
1555 if (!parse->priv->index_last_valid) {
1556 GstClockTime prev_ts;
1558 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1559 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1560 GST_DEBUG_OBJECT (parse,
1561 "entry too close to existing entry %" GST_TIME_FORMAT,
1562 GST_TIME_ARGS (prev_ts));
1563 parse->priv->index_last_offset = offset;
1564 parse->priv->index_last_ts = ts;
1570 associations[0].format = GST_FORMAT_TIME;
1571 associations[0].value = ts;
1572 associations[1].format = GST_FORMAT_BYTES;
1573 associations[1].value = offset;
1575 /* index might change on-the-fly, although that would be nutty app ... */
1576 GST_BASE_PARSE_INDEX_LOCK (parse);
1577 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1578 (key) ? GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT :
1579 GST_INDEX_ASSOCIATION_FLAG_DELTA_UNIT, 2,
1580 (const GstIndexAssociation *) &associations);
1581 GST_BASE_PARSE_INDEX_UNLOCK (parse);
1584 parse->priv->index_last_offset = offset;
1585 parse->priv->index_last_ts = ts;
1594 /* check for seekable upstream, above and beyond a mere query */
1596 gst_base_parse_check_seekability (GstBaseParse * parse)
1599 gboolean seekable = FALSE;
1600 gint64 start = -1, stop = -1;
1601 guint idx_interval = 0;
1603 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1604 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1605 GST_DEBUG_OBJECT (parse, "seeking query failed");
1609 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1611 /* try harder to query upstream size if we didn't get it the first time */
1612 if (seekable && stop == -1) {
1613 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1614 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1617 /* if upstream doesn't know the size, it's likely that it's not seekable in
1618 * practice even if it technically may be seekable */
1619 if (seekable && (start != 0 || stop <= start)) {
1620 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1624 /* let's not put every single frame into our index */
1626 if (stop < 10 * 1024 * 1024)
1628 else if (stop < 100 * 1024 * 1024)
1631 idx_interval = 1000;
1635 gst_query_unref (query);
1637 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1638 G_GUINT64_FORMAT ")", seekable, start, stop);
1639 parse->priv->upstream_seekable = seekable;
1640 parse->priv->upstream_size = seekable ? stop : 0;
1642 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1643 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1646 /* some misc checks on upstream */
1648 gst_base_parse_check_upstream (GstBaseParse * parse)
1652 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
1653 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1654 /* upstream has one, accept it also, and no further updates */
1655 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1656 parse->priv->upstream_has_duration = TRUE;
1659 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1660 parse->priv->upstream_has_duration);
1663 /* checks src caps to determine if dealing with audio or video */
1664 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1666 gst_base_parse_check_media (GstBaseParse * parse)
1671 caps = gst_pad_get_current_caps (parse->srcpad);
1672 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1673 parse->priv->is_video =
1674 g_str_has_prefix (gst_structure_get_name (s), "video");
1676 /* historical default */
1677 parse->priv->is_video = FALSE;
1680 gst_caps_unref (caps);
1682 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1685 /* takes ownership of frame */
1687 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1689 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1690 /* frame allocated on the heap, we can just take ownership */
1691 g_queue_push_tail (&parse->priv->queued_frames, frame);
1692 GST_TRACE ("queued frame %p", frame);
1694 GstBaseParseFrame *copy;
1696 /* probably allocated on the stack, must make a proper copy */
1697 copy = gst_base_parse_frame_copy (frame);
1698 g_queue_push_tail (&parse->priv->queued_frames, copy);
1699 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1700 gst_base_parse_frame_free (frame);
1704 /* makes sure that @buf is properly prepared and decorated for passing
1705 * to baseclass, and an equally setup frame is returned setup with @buf.
1706 * Takes ownership of @buf. */
1707 static GstBaseParseFrame *
1708 gst_base_parse_prepare_frame (GstBaseParse * parse, GstBuffer * buffer)
1710 GstBaseParseFrame *frame = NULL;
1712 buffer = gst_buffer_make_writable (buffer);
1714 GST_LOG_OBJECT (parse,
1715 "preparing frame at offset %" G_GUINT64_FORMAT
1716 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
1717 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1718 gst_buffer_get_size (buffer));
1720 if (parse->priv->discont) {
1721 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1722 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1723 parse->priv->discont = FALSE;
1726 GST_BUFFER_OFFSET (buffer) = parse->priv->offset;
1728 frame = gst_base_parse_frame_new (buffer, 0, 0);
1730 /* also ensure to update state flags */
1731 gst_base_parse_frame_update (parse, frame, buffer);
1732 gst_buffer_unref (buffer);
1734 if (parse->priv->prev_offset != parse->priv->offset || parse->priv->new_frame) {
1735 GST_LOG_OBJECT (parse, "marking as new frame");
1736 parse->priv->new_frame = FALSE;
1737 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME;
1740 frame->offset = parse->priv->prev_offset = parse->priv->offset;
1742 /* use default handler to provide initial (upstream) metadata */
1743 gst_base_parse_parse_frame (parse, frame);
1748 /* Wraps buffer in a frame and dispatches to subclass.
1749 * Also manages data skipping and offset handling (including adapter flushing).
1750 * Takes ownership of @buffer */
1751 static GstFlowReturn
1752 gst_base_parse_handle_buffer (GstBaseParse * parse, GstBuffer * buffer,
1753 gint * skip, gint * flushed)
1755 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1756 GstBaseParseFrame *frame;
1759 g_return_val_if_fail (skip != NULL || flushed != NULL, GST_FLOW_ERROR);
1761 GST_LOG_OBJECT (parse,
1762 "handling buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT
1763 ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer),
1764 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1765 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1767 /* track what is being flushed during this single round of frame processing */
1768 parse->priv->flushed = 0;
1771 /* make it easy for _finish_frame to pick up input data */
1772 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1773 gst_buffer_ref (buffer);
1774 gst_adapter_push (parse->priv->adapter, buffer);
1777 frame = gst_base_parse_prepare_frame (parse, buffer);
1778 ret = klass->handle_frame (parse, frame, skip);
1780 *flushed = parse->priv->flushed;
1782 GST_LOG_OBJECT (parse, "handle_frame skipped %d, flushed %d",
1785 if (ret != GST_FLOW_OK) {
1786 GST_DEBUG_OBJECT (parse, "handle_frame returned %d", ret);
1790 /* subclass can only do one of these, or semantics are too unclear */
1791 g_assert (*skip == 0 || *flushed == 0);
1793 /* track skipping */
1795 GstClockTime timestamp;
1798 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", *skip);
1799 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
1800 /* reverse playback, and no frames found yet, so we are skipping
1801 * the leading part of a fragment, which may form the tail of
1802 * fragment coming later, hopefully subclass skips efficiently ... */
1803 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
1804 outbuf = gst_adapter_take_buffer (parse->priv->adapter, *skip);
1805 outbuf = gst_buffer_make_writable (outbuf);
1806 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
1807 parse->priv->buffers_head =
1808 g_slist_prepend (parse->priv->buffers_head, outbuf);
1811 gst_adapter_flush (parse->priv->adapter, *skip);
1813 if (!parse->priv->discont)
1814 parse->priv->sync_offset = parse->priv->offset;
1815 parse->priv->offset += *skip;
1816 parse->priv->discont = TRUE;
1817 /* check for indefinite skipping */
1818 if (ret == GST_FLOW_OK)
1819 ret = gst_base_parse_check_sync (parse);
1822 parse->priv->offset += *flushed;
1825 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1826 gst_adapter_clear (parse->priv->adapter);
1829 gst_base_parse_frame_free (frame);
1834 /* gst_base_parse_handle_and_push_buffer:
1835 * @parse: #GstBaseParse.
1836 * @klass: #GstBaseParseClass.
1837 * @frame: (transfer full): a #GstBaseParseFrame
1839 * Parses the frame from given buffer and pushes it forward. Also performs
1840 * timestamp handling and checks the segment limits.
1842 * This is called with srcpad STREAM_LOCK held.
1844 * Returns: #GstFlowReturn
1846 static GstFlowReturn
1847 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1848 GstBaseParseFrame * frame)
1853 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1855 /* some one-time start-up */
1856 if (G_UNLIKELY (!parse->priv->framecount)) {
1857 gst_base_parse_check_seekability (parse);
1858 gst_base_parse_check_upstream (parse);
1861 buffer = frame->buffer;
1862 offset = frame->offset;
1864 /* check if subclass/format can provide ts.
1865 * If so, that allows and enables extra seek and duration determining options */
1866 if (G_UNLIKELY (parse->priv->first_frame_offset < 0)) {
1867 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1868 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1869 parse->priv->first_frame_offset = offset;
1870 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1871 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1872 " for first frame at offset %" G_GINT64_FORMAT,
1873 GST_TIME_ARGS (parse->priv->first_frame_ts),
1874 parse->priv->first_frame_offset);
1875 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1877 GstClockTime last_ts = G_MAXINT64;
1879 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1880 gst_base_parse_locate_time (parse, &last_ts, &off);
1881 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1882 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1885 /* disable further checks */
1886 parse->priv->first_frame_offset = 0;
1890 /* again use default handler to add missing metadata;
1891 * we may have new information on frame properties */
1892 gst_base_parse_parse_frame (parse, frame);
1893 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1894 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1895 parse->priv->next_ts =
1896 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1898 /* we lost track, do not produce bogus time next time around
1899 * (probably means parser subclass has given up on parsing as well) */
1900 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1901 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1904 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1905 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1906 gst_base_parse_add_index_entry (parse, offset,
1907 GST_BUFFER_TIMESTAMP (buffer),
1908 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1910 /* All OK, push queued frames if there are any */
1911 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1912 GstBaseParseFrame *queued_frame;
1914 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1915 gst_base_parse_push_frame (parse, queued_frame);
1919 return gst_base_parse_push_frame (parse, frame);
1923 * gst_base_parse_push_frame:
1924 * @parse: #GstBaseParse.
1925 * @frame: (transfer none): a #GstBaseParseFrame
1927 * Pushes the frame's buffer downstream, sends any pending events and
1928 * does some timestamp and segment handling. Takes ownership of
1929 * frame's buffer, though caller retains ownership of @frame.
1931 * This must be called with sinkpad STREAM_LOCK held.
1933 * Returns: #GstFlowReturn
1938 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1940 GstFlowReturn ret = GST_FLOW_OK;
1941 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1942 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1943 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1947 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1948 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1950 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1952 buffer = frame->buffer;
1954 GST_LOG_OBJECT (parse,
1955 "processing buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT
1956 ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer),
1957 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1958 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1961 parse->priv->bytecount += frame->size;
1962 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1963 parse->priv->framecount++;
1964 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1965 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1968 /* 0 means disabled */
1969 if (parse->priv->update_interval < 0)
1970 parse->priv->update_interval = 50;
1971 else if (parse->priv->update_interval > 0 &&
1972 (parse->priv->framecount % parse->priv->update_interval) == 0)
1973 gst_base_parse_update_duration (parse);
1975 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1976 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1977 if (last_start != GST_CLOCK_TIME_NONE
1978 && GST_BUFFER_DURATION_IS_VALID (buffer))
1979 last_stop = last_start + GST_BUFFER_DURATION (buffer);
1981 /* should have caps by now */
1982 if (!gst_pad_has_current_caps (parse->srcpad))
1985 if (G_UNLIKELY (parse->priv->pending_segment)) {
1986 /* have caps; check identity */
1987 gst_base_parse_check_media (parse);
1990 /* and should then also be linked downstream, so safe to send some events */
1991 if (G_UNLIKELY (parse->priv->close_segment)) {
1992 /* only set up by loop */
1993 GST_DEBUG_OBJECT (parse, "loop sending close segment");
1994 gst_pad_push_event (parse->srcpad, parse->priv->close_segment);
1995 parse->priv->close_segment = NULL;
1998 /* Push pending events, including NEWSEGMENT events */
1999 if (G_UNLIKELY (parse->priv->pending_events)) {
2002 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
2003 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
2005 g_list_free (parse->priv->pending_events);
2006 parse->priv->pending_events = NULL;
2007 parse->priv->pending_segment = FALSE;
2010 /* segment adjustment magic; only if we are running the whole show */
2011 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
2012 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
2013 parse->priv->upstream_seekable)) {
2015 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
2016 GST_CLOCK_TIME_IS_VALID (last_start)) {
2017 GstClockTimeDiff diff;
2019 /* only send newsegments with increasing start times,
2020 * otherwise if these go back and forth downstream (sinks) increase
2021 * accumulated time and running_time */
2022 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
2023 if (G_UNLIKELY (diff > 2 * GST_SECOND
2024 && last_start > parse->segment.start
2025 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
2026 || last_start < parse->segment.stop))) {
2028 GST_DEBUG_OBJECT (parse,
2029 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
2030 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
2031 "Sending updated NEWSEGMENT events", diff,
2032 GST_TIME_ARGS (parse->segment.position),
2033 GST_TIME_ARGS (last_start));
2035 /* skip gap FIXME */
2036 gst_pad_push_event (parse->srcpad,
2037 gst_event_new_segment (&parse->segment));
2039 parse->segment.position = last_start;
2044 /* update bitrates and optionally post corresponding tags
2045 * (following newsegment) */
2046 gst_base_parse_update_bitrates (parse, frame);
2048 if (klass->pre_push_frame) {
2049 ret = klass->pre_push_frame (parse, frame);
2051 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
2054 /* take final ownership of frame buffer */
2055 if (frame->out_buffer) {
2056 buffer = frame->out_buffer;
2057 frame->out_buffer = NULL;
2058 gst_buffer_replace (&frame->buffer, NULL);
2060 buffer = frame->buffer;
2061 frame->buffer = NULL;
2064 /* subclass must play nice */
2065 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2067 size = gst_buffer_get_size (buffer);
2069 parse->priv->seen_keyframe |= parse->priv->is_video &&
2070 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
2072 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
2073 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2074 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
2075 GST_BUFFER_TIMESTAMP (buffer) >
2076 parse->segment.stop + parse->priv->lead_out_ts) {
2077 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
2079 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2080 GST_BUFFER_DURATION_IS_VALID (buffer) &&
2081 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
2082 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
2083 parse->priv->lead_in_ts < parse->segment.start) {
2084 if (parse->priv->seen_keyframe) {
2085 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
2088 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
2089 ret = GST_BASE_PARSE_FLOW_DROPPED;
2096 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2097 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2098 gst_buffer_unref (buffer);
2100 } else if (ret == GST_FLOW_OK) {
2101 if (parse->segment.rate > 0.0) {
2102 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2104 ret = gst_pad_push (parse->srcpad, buffer);
2105 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2107 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2109 parse->priv->buffers_queued =
2110 g_slist_prepend (parse->priv->buffers_queued, buffer);
2114 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2115 size, gst_flow_get_name (ret));
2116 gst_buffer_unref (buffer);
2117 /* if we are not sufficiently in control, let upstream decide on EOS */
2118 if (ret == GST_FLOW_EOS &&
2119 (parse->priv->passthrough ||
2120 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2121 !parse->priv->upstream_seekable)))
2125 /* Update current running segment position */
2126 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
2127 parse->segment.position < last_stop)
2128 parse->segment.position = last_stop;
2135 GST_ELEMENT_ERROR (parse, STREAM, DECODE, ("No caps set"), (NULL));
2136 return GST_FLOW_ERROR;
2141 * gst_base_parse_finish_frame:
2142 * @parse: a #GstBaseParse
2143 * @frame: a #GstBaseParseFrame
2144 * @size: consumed input data represented by frame
2146 * Collects parsed data and pushes this downstream.
2147 * Source pad caps must be set when this is called.
2149 * If @frame's out_buffer is set, that will be used as subsequent frame data.
2150 * Otherwise, @size samples will be taken from the input and used for output,
2151 * and the output's metadata (timestamps etc) will be taken as (optionally)
2152 * set by the subclass on @frame's (input) buffer (which is otherwise
2153 * ignored for any but the above purpose/information).
2155 * Note that the latter buffer is invalidated by this call, whereas the
2156 * caller retains ownership of @frame.
2158 * Returns: a #GstFlowReturn that should be escalated to caller (of caller)
2163 gst_base_parse_finish_frame (GstBaseParse * parse, GstBaseParseFrame * frame,
2166 GstFlowReturn ret = GST_FLOW_OK;
2168 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2169 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
2170 g_return_val_if_fail (size > 0 || frame->out_buffer, GST_FLOW_ERROR);
2171 g_return_val_if_fail (gst_adapter_available (parse->priv->adapter) >= size,
2174 GST_LOG_OBJECT (parse, "finished frame at offset %" G_GUINT64_FORMAT ", "
2175 "flushing size %d", frame->offset, size);
2177 if (parse->priv->scanning && frame->buffer) {
2178 if (!parse->priv->scanned_frame) {
2179 parse->priv->scanned_frame = gst_base_parse_frame_copy (frame);
2184 parse->priv->flushed += size;
2186 /* either PUSH or PULL mode arranges for adapter data */
2187 /* ensure output buffer */
2188 if (!frame->out_buffer) {
2189 GstBuffer *src, *dest;
2191 frame->out_buffer = gst_adapter_take_buffer (parse->priv->adapter, size);
2192 dest = frame->out_buffer;
2193 src = frame->buffer;
2194 GST_BUFFER_PTS (dest) = GST_BUFFER_PTS (src);
2195 GST_BUFFER_DTS (dest) = GST_BUFFER_DTS (src);
2196 GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src);
2197 GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src);
2198 GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src);
2199 GST_MINI_OBJECT_FLAGS (dest) = GST_MINI_OBJECT_FLAGS (src);
2201 gst_adapter_flush (parse->priv->adapter, size);
2204 /* use as input for subsequent processing */
2205 gst_buffer_replace (&frame->buffer, frame->out_buffer);
2206 gst_buffer_unref (frame->out_buffer);
2207 frame->out_buffer = NULL;
2209 /* mark input size consumed */
2212 /* subclass might queue frames/data internally if it needs more
2213 * frames to decide on the format, or might request us to queue here. */
2214 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_DROP) {
2215 gst_buffer_replace (&frame->buffer, NULL);
2217 } else if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_QUEUE) {
2218 GstBaseParseFrame *copy;
2220 copy = gst_base_parse_frame_copy (frame);
2221 copy->flags &= ~GST_BASE_PARSE_FRAME_FLAG_QUEUE;
2222 gst_base_parse_queue_frame (parse, copy);
2226 ret = gst_base_parse_handle_and_push_frame (parse, frame);
2232 /* gst_base_parse_drain:
2234 * Drains the adapter until it is empty. It decreases the min_frame_size to
2235 * match the current adapter size and calls chain method until the adapter
2236 * is emptied or chain returns with error.
2239 gst_base_parse_drain (GstBaseParse * parse)
2243 GST_DEBUG_OBJECT (parse, "draining");
2244 parse->priv->drain = TRUE;
2247 avail = gst_adapter_available (parse->priv->adapter);
2251 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2252 NULL) != GST_FLOW_OK) {
2256 /* nothing changed, maybe due to truncated frame; break infinite loop */
2257 if (avail == gst_adapter_available (parse->priv->adapter)) {
2258 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2259 gst_adapter_clear (parse->priv->adapter);
2263 parse->priv->drain = FALSE;
2266 /* gst_base_parse_send_buffers
2268 * Sends buffers collected in send_buffers downstream, and ensures that list
2269 * is empty at the end (errors or not).
2271 static GstFlowReturn
2272 gst_base_parse_send_buffers (GstBaseParse * parse)
2274 GSList *send = NULL;
2276 GstFlowReturn ret = GST_FLOW_OK;
2278 send = parse->priv->buffers_send;
2282 buf = GST_BUFFER_CAST (send->data);
2283 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
2284 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2285 ", offset %" G_GINT64_FORMAT, buf,
2286 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
2287 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2289 /* iterate output queue an push downstream */
2290 ret = gst_pad_push (parse->srcpad, buf);
2291 send = g_slist_delete_link (send, send);
2293 /* clear any leftover if error */
2294 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2296 buf = GST_BUFFER_CAST (send->data);
2297 gst_buffer_unref (buf);
2298 send = g_slist_delete_link (send, send);
2303 parse->priv->buffers_send = send;
2308 /* gst_base_parse_start_fragment:
2310 * Prepares for processing a reverse playback (forward) fragment
2311 * by (re)setting proper state variables.
2313 static GstFlowReturn
2314 gst_base_parse_start_fragment (GstBaseParse * parse)
2316 GST_LOG_OBJECT (parse, "starting fragment");
2318 /* invalidate so no fall-back timestamping is performed;
2319 * ok if taken from subclass or upstream */
2320 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2321 parse->priv->prev_ts = GST_CLOCK_TIME_NONE;
2322 /* prevent it hanging around stop all the time */
2323 parse->segment.position = GST_CLOCK_TIME_NONE;
2325 parse->priv->discont = TRUE;
2327 /* head of previous fragment is now pending tail of current fragment */
2328 parse->priv->buffers_pending = parse->priv->buffers_head;
2329 parse->priv->buffers_head = NULL;
2335 /* gst_base_parse_finish_fragment:
2337 * Processes a reverse playback (forward) fragment:
2338 * - append head of last fragment that was skipped to current fragment data
2339 * - drain the resulting current fragment data (i.e. repeated chain)
2340 * - add time/duration (if needed) to frames queued by chain
2341 * - push queued data
2343 static GstFlowReturn
2344 gst_base_parse_finish_fragment (GstBaseParse * parse, gboolean prev_head)
2347 GstFlowReturn ret = GST_FLOW_OK;
2348 gboolean seen_key = FALSE, seen_delta = FALSE;
2350 GST_LOG_OBJECT (parse, "finishing fragment");
2353 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2354 while (parse->priv->buffers_pending) {
2355 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2357 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2358 gst_buffer_get_size (buf));
2359 gst_adapter_push (parse->priv->adapter, buf);
2361 GST_LOG_OBJECT (parse, "discarding head buffer");
2362 gst_buffer_unref (buf);
2364 parse->priv->buffers_pending =
2365 g_slist_delete_link (parse->priv->buffers_pending,
2366 parse->priv->buffers_pending);
2369 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2370 /* initial skipped data is added to buffers_pending */
2371 gst_base_parse_drain (parse);
2373 if (parse->priv->buffers_send) {
2374 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2375 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2378 /* add metadata (if needed to queued buffers */
2379 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2380 GST_TIME_ARGS (parse->priv->last_ts));
2381 while (parse->priv->buffers_queued) {
2382 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2384 /* no touching if upstream or parsing provided time */
2385 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2386 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2387 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2388 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2389 GST_BUFFER_DURATION_IS_VALID (buf)) {
2390 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2391 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2393 parse->priv->last_ts = 0;
2394 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2395 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2396 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2398 /* no idea, very bad */
2399 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2402 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2404 /* reverse order for ascending sending */
2405 /* send downstream at keyframe not preceded by a keyframe
2406 * (e.g. that should identify start of collection of IDR nals) */
2407 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2409 ret = gst_base_parse_send_buffers (parse);
2410 /* if a problem, throw all to sending */
2411 if (ret != GST_FLOW_OK) {
2412 parse->priv->buffers_send =
2413 g_slist_reverse (parse->priv->buffers_queued);
2414 parse->priv->buffers_queued = NULL;
2424 parse->priv->buffers_send =
2425 g_slist_prepend (parse->priv->buffers_send, buf);
2426 parse->priv->buffers_queued =
2427 g_slist_delete_link (parse->priv->buffers_queued,
2428 parse->priv->buffers_queued);
2431 /* audio may have all marked as keyframe, so arrange to send here */
2433 ret = gst_base_parse_send_buffers (parse);
2435 /* any trailing unused no longer usable (ideally none) */
2436 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2437 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2438 gst_adapter_available (parse->priv->adapter));
2439 gst_adapter_clear (parse->priv->adapter);
2445 /* small helper that checks whether we have been trying to resync too long */
2446 static inline GstFlowReturn
2447 gst_base_parse_check_sync (GstBaseParse * parse)
2449 if (G_UNLIKELY (parse->priv->discont &&
2450 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2451 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2452 ("Failed to parse stream"), (NULL));
2453 return GST_FLOW_ERROR;
2459 static GstFlowReturn
2460 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
2462 GstBaseParseClass *bclass;
2463 GstBaseParse *parse;
2464 GstFlowReturn ret = GST_FLOW_OK;
2465 GstBuffer *tmpbuf = NULL;
2470 GstClockTime timestamp;
2472 parse = GST_BASE_PARSE (parent);
2473 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2475 if (parse->priv->detecting) {
2476 GstBuffer *detect_buf;
2478 if (parse->priv->detect_buffers_size == 0) {
2479 detect_buf = gst_buffer_ref (buffer);
2484 detect_buf = gst_buffer_new ();
2486 for (l = parse->priv->detect_buffers; l; l = l->next) {
2487 gsize tmpsize = gst_buffer_get_size (l->data);
2489 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
2490 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
2494 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
2495 offset, gst_buffer_get_size (buffer));
2498 ret = bclass->detect (parse, detect_buf);
2499 gst_buffer_unref (detect_buf);
2501 if (ret == GST_FLOW_OK) {
2504 /* Detected something */
2505 parse->priv->detecting = FALSE;
2507 for (l = parse->priv->detect_buffers; l; l = l->next) {
2508 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2510 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2511 parent, GST_BUFFER_CAST (l->data));
2513 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2515 g_list_free (parse->priv->detect_buffers);
2516 parse->priv->detect_buffers = NULL;
2517 parse->priv->detect_buffers_size = 0;
2519 if (ret != GST_FLOW_OK) {
2523 /* Handle the current buffer */
2524 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2525 /* Still detecting, append buffer or error out if draining */
2527 if (parse->priv->drain) {
2528 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2529 return GST_FLOW_ERROR;
2530 } else if (parse->priv->flushing) {
2531 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2533 g_list_free (parse->priv->detect_buffers);
2534 parse->priv->detect_buffers = NULL;
2535 parse->priv->detect_buffers_size = 0;
2537 parse->priv->detect_buffers =
2538 g_list_append (parse->priv->detect_buffers, buffer);
2539 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
2543 /* Something went wrong, subclass responsible for error reporting */
2547 /* And now handle the current buffer if detection worked */
2550 if (G_LIKELY (buffer)) {
2551 GST_LOG_OBJECT (parse,
2552 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT,
2553 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer));
2554 if (G_UNLIKELY (parse->priv->passthrough)) {
2555 GstBaseParseFrame frame;
2557 gst_base_parse_frame_init (&frame);
2558 frame.buffer = gst_buffer_make_writable (buffer);
2559 ret = gst_base_parse_push_frame (parse, &frame);
2560 gst_base_parse_frame_free (&frame);
2563 /* upstream feeding us in reverse playback;
2564 * finish previous fragment and start new upon DISCONT */
2565 if (parse->segment.rate < 0.0) {
2566 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2567 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2568 ret = gst_base_parse_finish_fragment (parse, TRUE);
2569 gst_base_parse_start_fragment (parse);
2572 gst_adapter_push (parse->priv->adapter, buffer);
2575 /* Parse and push as many frames as possible */
2576 /* Stop either when adapter is empty or we are flushing */
2577 while (!parse->priv->flushing) {
2580 /* note: if subclass indicates MAX fsize,
2581 * this will not likely be available anyway ... */
2582 min_size = MAX (parse->priv->min_frame_size, fsize);
2583 av = gst_adapter_available (parse->priv->adapter);
2585 if (G_UNLIKELY (parse->priv->drain)) {
2587 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2588 if (G_UNLIKELY (!min_size)) {
2593 /* Collect at least min_frame_size bytes */
2594 if (av < min_size) {
2595 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)", av);
2599 /* move along with upstream timestamp (if any),
2600 * but interpolate in between */
2601 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2602 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2603 (parse->priv->prev_ts != timestamp)) {
2604 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2607 /* always pass all available data */
2608 data = gst_adapter_map (parse->priv->adapter, av);
2609 /* arrange for actual data to be copied if subclass tries to,
2610 * since what is passed is tied to the adapter */
2611 tmpbuf = gst_buffer_new ();
2612 gst_buffer_take_memory (tmpbuf, -1,
2613 gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY |
2614 GST_MEMORY_FLAG_NO_SHARE, (gpointer) data, av, 0, av, NULL, NULL));
2616 /* keep the adapter mapped, so keep track of what has to be flushed */
2617 ret = gst_base_parse_handle_buffer (parse, tmpbuf, &skip, &flush);
2620 /* probably already implicitly unmapped due to adapter operation,
2621 * but for good measure ... */
2622 gst_adapter_unmap (parse->priv->adapter);
2623 if (ret != GST_FLOW_OK) {
2626 if (skip == 0 && flush == 0) {
2627 GST_LOG_OBJECT (parse, "nothing skipped and no frames finished, "
2628 "breaking to get more data");
2634 GST_LOG_OBJECT (parse, "chain leaving");
2638 /* pull @size bytes at current offset,
2639 * i.e. at least try to and possibly return a shorter buffer if near the end */
2640 static GstFlowReturn
2641 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2642 GstBuffer ** buffer)
2644 GstFlowReturn ret = GST_FLOW_OK;
2646 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2648 /* Caching here actually makes much less difference than one would expect.
2649 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2650 if (parse->priv->cache) {
2651 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2652 gint cache_size = gst_buffer_get_size (parse->priv->cache);
2654 if (cache_offset <= parse->priv->offset &&
2655 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2656 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
2657 parse->priv->offset - cache_offset, size);
2658 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2661 /* not enough data in the cache, free cache and get a new one */
2662 gst_buffer_unref (parse->priv->cache);
2663 parse->priv->cache = NULL;
2666 /* refill the cache */
2668 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2669 64 * 1024), &parse->priv->cache);
2670 if (ret != GST_FLOW_OK) {
2671 parse->priv->cache = NULL;
2675 if (gst_buffer_get_size (parse->priv->cache) >= size) {
2677 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
2679 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2683 /* Not possible to get enough data, try a last time with
2684 * requesting exactly the size we need */
2685 gst_buffer_unref (parse->priv->cache);
2686 parse->priv->cache = NULL;
2688 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2689 &parse->priv->cache);
2691 if (ret != GST_FLOW_OK) {
2692 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2697 if (gst_buffer_get_size (parse->priv->cache) < size) {
2698 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2699 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
2700 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
2702 *buffer = parse->priv->cache;
2703 parse->priv->cache = NULL;
2709 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
2710 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2715 static GstFlowReturn
2716 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2719 GstClockTime ts = 0;
2723 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2724 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2725 parse->priv->last_offset);
2727 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2728 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2729 GST_TIME_ARGS (parse->segment.start));
2734 /* last fragment started at last_offset / last_ts;
2735 * seek back 10s capped at 1MB */
2736 if (parse->priv->last_ts >= 10 * GST_SECOND)
2737 ts = parse->priv->last_ts - 10 * GST_SECOND;
2738 /* if we are exact now, we will be more so going backwards */
2739 if (parse->priv->exact_position) {
2740 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2742 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2743 GST_FORMAT_BYTES, &offset)) {
2744 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2747 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2748 parse->priv->last_offset - 1024);
2749 offset = MAX (0, offset);
2751 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2753 parse->priv->offset = offset;
2755 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2757 if (ret != GST_FLOW_OK)
2760 /* offset will increase again as fragment is processed/parsed */
2761 parse->priv->last_offset = offset;
2763 gst_base_parse_start_fragment (parse);
2764 gst_adapter_push (parse->priv->adapter, buffer);
2765 ret = gst_base_parse_finish_fragment (parse, TRUE);
2766 if (ret != GST_FLOW_OK)
2769 /* force previous fragment */
2770 parse->priv->offset = -1;
2777 * pull and scan for next frame starting from current offset
2778 * ajusts sync, drain and offset going along */
2779 static GstFlowReturn
2780 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2784 GstFlowReturn ret = GST_FLOW_OK;
2785 guint fsize, min_size;
2789 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2790 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2792 /* let's make this efficient for all subclass once and for all;
2793 * maybe it does not need this much, but in the latter case, we know we are
2794 * in pull mode here and might as well try to read and supply more anyway
2795 * (so does the buffer caching mechanism) */
2799 min_size = MAX (parse->priv->min_frame_size, fsize);
2801 GST_LOG_OBJECT (parse, "reading buffer size %u", min_size);
2803 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2804 if (ret != GST_FLOW_OK)
2807 /* if we got a short read, inform subclass we are draining leftover
2808 * and no more is to be expected */
2809 if (gst_buffer_get_size (buffer) < min_size) {
2810 GST_LOG_OBJECT (parse, "... but did not get that; marked draining");
2811 parse->priv->drain = TRUE;
2814 if (parse->priv->detecting) {
2815 ret = klass->detect (parse, buffer);
2816 if (ret == GST_FLOW_NOT_NEGOTIATED) {
2817 /* If draining we error out, otherwise request a buffer
2819 if (parse->priv->drain) {
2820 gst_buffer_unref (buffer);
2821 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
2822 return GST_FLOW_ERROR;
2825 gst_buffer_unref (buffer);
2828 } else if (ret != GST_FLOW_OK) {
2829 gst_buffer_unref (buffer);
2830 GST_ERROR_OBJECT (parse, "detect() returned %s",
2831 gst_flow_get_name (ret));
2835 /* Else handle this buffer normally */
2838 ret = gst_base_parse_handle_buffer (parse, buffer, &skip, &flushed);
2839 if (ret != GST_FLOW_OK)
2842 /* something flushed means something happened,
2843 * and we should bail out of this loop so as not to occupy
2844 * the task thread indefinitely */
2846 GST_LOG_OBJECT (parse, "frame finished, breaking loop");
2849 /* nothing flushed, no skip and draining, so nothing left to do */
2850 if (!skip && parse->priv->drain) {
2851 GST_LOG_OBJECT (parse, "no activity or result when draining; "
2852 "breaking loop and marking EOS");
2856 /* otherwise, get some more data
2857 * note that is checked this does not happen indefinitely */
2859 GST_LOG_OBJECT (parse, "getting some more data");
2862 parse->priv->drain = FALSE;
2869 /* Loop that is used in pull mode to retrieve data from upstream */
2871 gst_base_parse_loop (GstPad * pad)
2873 GstBaseParse *parse;
2874 GstBaseParseClass *klass;
2875 GstFlowReturn ret = GST_FLOW_OK;
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 ret = gst_base_parse_scan_frame (parse, klass, TRUE);
2893 if (ret != GST_FLOW_OK)
2896 /* eat expected eos signalling past segment in reverse playback */
2897 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
2898 parse->segment.position >= parse->segment.stop) {
2899 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2900 /* push what was accumulated during loop run */
2901 gst_base_parse_finish_fragment (parse, FALSE);
2902 /* force previous fragment */
2903 parse->priv->offset = -1;
2908 if (ret == GST_FLOW_EOS)
2910 else if (ret != GST_FLOW_OK)
2913 gst_object_unref (parse);
2920 GST_DEBUG_OBJECT (parse, "eos");
2925 gboolean push_eos = FALSE;
2927 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2928 gst_flow_get_name (ret));
2929 gst_pad_pause_task (parse->sinkpad);
2931 if (ret == GST_FLOW_EOS) {
2932 /* handle end-of-stream/segment */
2933 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2936 if ((stop = parse->segment.stop) == -1)
2937 stop = parse->segment.duration;
2939 GST_DEBUG_OBJECT (parse, "sending segment_done");
2941 gst_element_post_message
2942 (GST_ELEMENT_CAST (parse),
2943 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2944 GST_FORMAT_TIME, stop));
2946 /* If we STILL have zero frames processed, fire an error */
2947 if (parse->priv->framecount == 0) {
2948 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2949 ("No valid frames found before end of stream"), (NULL));
2953 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
2954 /* for fatal errors we post an error message, wrong-state is
2955 * not fatal because it happens due to flushes and only means
2956 * that we should stop now. */
2957 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2958 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
2962 /* Push pending events, including NEWSEGMENT events */
2963 if (G_UNLIKELY (parse->priv->pending_events)) {
2966 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
2967 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
2969 g_list_free (parse->priv->pending_events);
2970 parse->priv->pending_events = NULL;
2971 parse->priv->pending_segment = FALSE;
2974 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
2976 gst_object_unref (parse);
2981 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
2983 GstBaseParse *parse;
2987 parse = GST_BASE_PARSE (parent);
2989 GST_DEBUG_OBJECT (parse, "sink activate");
2991 query = gst_query_new_scheduling ();
2992 if (!gst_pad_peer_query (sinkpad, query)) {
2993 gst_query_unref (query);
2994 goto baseparse_push;
2997 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL);
2998 gst_query_unref (query);
3001 goto baseparse_push;
3003 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
3004 if (!gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE))
3005 goto baseparse_push;
3007 return gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop,
3012 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
3013 return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
3018 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
3020 GstBaseParseClass *klass;
3021 gboolean result = TRUE;
3023 GST_DEBUG_OBJECT (parse, "activate %d", active);
3025 klass = GST_BASE_PARSE_GET_CLASS (parse);
3028 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
3029 result = klass->start (parse);
3031 /* If the subclass implements ::detect we want to
3032 * call it for the first buffers now */
3033 parse->priv->detecting = (klass->detect != NULL);
3035 /* We must make sure streaming has finished before resetting things
3036 * and calling the ::stop vfunc */
3037 GST_PAD_STREAM_LOCK (parse->sinkpad);
3038 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3040 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
3041 result = klass->stop (parse);
3043 parse->priv->pad_mode = GST_PAD_MODE_NONE;
3045 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
3050 gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
3051 GstPadMode mode, gboolean active)
3054 GstBaseParse *parse;
3056 parse = GST_BASE_PARSE (parent);
3058 GST_DEBUG_OBJECT (parse, "sink activate mode %d, %d", mode, active);
3060 if (!gst_base_parse_activate (parse, active))
3061 goto activate_failed;
3064 case GST_PAD_MODE_PULL:
3066 parse->priv->pending_events =
3067 g_list_append (parse->priv->pending_events,
3068 gst_event_new_segment (&parse->segment));
3069 parse->priv->pending_segment = TRUE;
3072 result = gst_pad_stop_task (pad);
3080 parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
3082 GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
3089 GST_DEBUG_OBJECT (parse, "activate failed");
3095 * gst_base_parse_set_duration:
3096 * @parse: #GstBaseParse.
3098 * @duration: duration value.
3099 * @interval: how often to update the duration estimate based on bitrate, or 0.
3101 * Sets the duration of the currently playing media. Subclass can use this
3102 * when it is able to determine duration and/or notices a change in the media
3103 * duration. Alternatively, if @interval is non-zero (default), then stream
3104 * duration is determined based on estimated bitrate, and updated every @interval
3110 gst_base_parse_set_duration (GstBaseParse * parse,
3111 GstFormat fmt, gint64 duration, gint interval)
3113 g_return_if_fail (parse != NULL);
3115 if (parse->priv->upstream_has_duration) {
3116 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3120 if (duration != parse->priv->duration) {
3123 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
3124 gst_element_post_message (GST_ELEMENT (parse), m);
3126 /* TODO: what about duration tag? */
3128 parse->priv->duration = duration;
3129 parse->priv->duration_fmt = fmt;
3130 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3131 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3132 if (interval != 0) {
3133 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3137 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3138 parse->priv->update_interval = interval;
3144 * gst_base_parse_set_average_bitrate:
3145 * @parse: #GstBaseParse.
3146 * @bitrate: average bitrate in bits/second
3148 * Optionally sets the average bitrate detected in media (if non-zero),
3149 * e.g. based on metadata, as it will be posted to the application.
3151 * By default, announced average bitrate is estimated. The average bitrate
3152 * is used to estimate the total duration of the stream and to estimate
3153 * a seek position, if there's no index and the format is syncable
3154 * (see gst_base_parse_set_syncable()).
3159 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3161 parse->priv->bitrate = bitrate;
3162 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3166 * gst_base_parse_set_min_frame_size:
3167 * @parse: #GstBaseParse.
3168 * @min_size: Minimum size of the data that this base class should give to
3171 * Subclass can use this function to tell the base class that it needs to
3172 * give at least #min_size buffers.
3177 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3179 g_return_if_fail (parse != NULL);
3181 parse->priv->min_frame_size = min_size;
3182 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3186 * gst_base_parse_set_frame_rate:
3187 * @parse: the #GstBaseParse to set
3188 * @fps_num: frames per second (numerator).
3189 * @fps_den: frames per second (denominator).
3190 * @lead_in: frames needed before a segment for subsequent decode
3191 * @lead_out: frames needed after a segment
3193 * If frames per second is configured, parser can take care of buffer duration
3194 * and timestamping. When performing segment clipping, or seeking to a specific
3195 * location, a corresponding decoder might need an initial @lead_in and a
3196 * following @lead_out number of frames to ensure the desired segment is
3197 * entirely filled upon decoding.
3202 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3203 guint fps_den, guint lead_in, guint lead_out)
3205 g_return_if_fail (parse != NULL);
3207 parse->priv->fps_num = fps_num;
3208 parse->priv->fps_den = fps_den;
3209 if (!fps_num || !fps_den) {
3210 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3212 fps_num = fps_den = 0;
3213 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3214 parse->priv->lead_in = parse->priv->lead_out = 0;
3215 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3217 parse->priv->frame_duration =
3218 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3219 parse->priv->lead_in = lead_in;
3220 parse->priv->lead_out = lead_out;
3221 parse->priv->lead_in_ts =
3222 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3223 parse->priv->lead_out_ts =
3224 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3225 /* aim for about 1.5s to estimate duration */
3226 if (parse->priv->update_interval < 0) {
3227 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3228 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3229 parse->priv->update_interval);
3232 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3233 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3234 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3235 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3236 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3237 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3241 * gst_base_parse_set_has_timing_info:
3242 * @parse: a #GstBaseParse
3243 * @has_timing: whether frames carry timing information
3245 * Set if frames carry timing information which the subclass can (generally)
3246 * parse and provide. In particular, intrinsic (rather than estimated) time
3247 * can be obtained following a seek.
3252 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3254 parse->priv->has_timing_info = has_timing;
3255 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3259 * gst_base_parse_set_syncable:
3260 * @parse: a #GstBaseParse
3261 * @syncable: set if frame starts can be identified
3263 * Set if frame starts can be identified. This is set by default and
3264 * determines whether seeking based on bitrate averages
3265 * is possible for a format/stream.
3270 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3272 parse->priv->syncable = syncable;
3273 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3277 * gst_base_parse_set_passthrough:
3278 * @parse: a #GstBaseParse
3279 * @passthrough: %TRUE if parser should run in passthrough mode
3281 * Set if the nature of the format or configuration does not allow (much)
3282 * parsing, and the parser should operate in passthrough mode (which only
3283 * applies when operating in push mode). That is, incoming buffers are
3284 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3285 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3286 * so subclass can perform as much or as little is appropriate for
3287 * passthrough semantics in @pre_push_frame.
3292 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3294 parse->priv->passthrough = passthrough;
3295 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3299 * gst_base_parse_set_latency:
3300 * @parse: a #GstBaseParse
3301 * @min_latency: minimum parse latency
3302 * @max_latency: maximum parse latency
3304 * Sets the minimum and maximum (which may likely be equal) latency introduced
3305 * by the parsing process. If there is such a latency, which depends on the
3306 * particular parsing of the format, it typically corresponds to 1 frame duration.
3311 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3312 GstClockTime max_latency)
3314 GST_OBJECT_LOCK (parse);
3315 parse->priv->min_latency = min_latency;
3316 parse->priv->max_latency = max_latency;
3317 GST_OBJECT_UNLOCK (parse);
3318 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3319 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3320 GST_TIME_ARGS (max_latency));
3324 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3325 GstClockTime * duration)
3327 gboolean res = FALSE;
3329 g_return_val_if_fail (duration != NULL, FALSE);
3331 *duration = GST_CLOCK_TIME_NONE;
3332 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3333 GST_LOG_OBJECT (parse, "using provided duration");
3334 *duration = parse->priv->duration;
3336 } else if (parse->priv->duration != -1) {
3337 GST_LOG_OBJECT (parse, "converting provided duration");
3338 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3339 parse->priv->duration, format, (gint64 *) duration);
3340 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3341 GST_LOG_OBJECT (parse, "using estimated duration");
3342 *duration = parse->priv->estimated_duration;
3345 GST_LOG_OBJECT (parse, "cannot estimate duration");
3348 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3349 GST_TIME_ARGS (*duration));
3354 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
3356 GstBaseParse *parse;
3357 gboolean res = FALSE;
3359 parse = GST_BASE_PARSE (parent);
3361 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3363 switch (GST_QUERY_TYPE (query)) {
3364 case GST_QUERY_POSITION:
3369 GST_DEBUG_OBJECT (parse, "position query");
3370 gst_query_parse_position (query, &format, NULL);
3372 /* try upstream first */
3373 res = gst_pad_query_default (pad, parent, query);
3375 /* Fall back on interpreting segment */
3376 GST_OBJECT_LOCK (parse);
3377 if (format == GST_FORMAT_BYTES) {
3378 dest_value = parse->priv->offset;
3380 } else if (format == parse->segment.format &&
3381 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
3382 dest_value = gst_segment_to_stream_time (&parse->segment,
3383 parse->segment.format, parse->segment.position);
3386 GST_OBJECT_UNLOCK (parse);
3388 /* no precise result, upstream no idea either, then best estimate */
3389 /* priv->offset is updated in both PUSH/PULL modes */
3390 res = gst_base_parse_convert (parse,
3391 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3394 gst_query_set_position (query, format, dest_value);
3398 case GST_QUERY_DURATION:
3401 GstClockTime duration;
3403 GST_DEBUG_OBJECT (parse, "duration query");
3404 gst_query_parse_duration (query, &format, NULL);
3406 /* consult upstream */
3407 res = gst_pad_query_default (pad, parent, query);
3409 /* otherwise best estimate from us */
3411 res = gst_base_parse_get_duration (parse, format, &duration);
3413 gst_query_set_duration (query, format, duration);
3417 case GST_QUERY_SEEKING:
3420 GstClockTime duration = GST_CLOCK_TIME_NONE;
3421 gboolean seekable = FALSE;
3423 GST_DEBUG_OBJECT (parse, "seeking query");
3424 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3426 /* consult upstream */
3427 res = gst_pad_query_default (pad, parent, query);
3429 /* we may be able to help if in TIME */
3430 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3431 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3432 /* already OK if upstream takes care */
3433 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3435 if (!(res && seekable)) {
3436 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3437 || duration == -1) {
3438 /* seekable if we still have a chance to get duration later on */
3440 parse->priv->upstream_seekable && parse->priv->update_interval;
3442 seekable = parse->priv->upstream_seekable;
3443 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3446 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3452 case GST_QUERY_FORMATS:
3453 gst_query_set_formatsv (query, 3, fmtlist);
3456 case GST_QUERY_CONVERT:
3458 GstFormat src_format, dest_format;
3459 gint64 src_value, dest_value;
3461 gst_query_parse_convert (query, &src_format, &src_value,
3462 &dest_format, &dest_value);
3464 res = gst_base_parse_convert (parse, src_format, src_value,
3465 dest_format, &dest_value);
3467 gst_query_set_convert (query, src_format, src_value,
3468 dest_format, dest_value);
3472 case GST_QUERY_LATENCY:
3474 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3476 GstClockTime min_latency, max_latency;
3478 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3479 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3480 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3481 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3483 GST_OBJECT_LOCK (parse);
3484 /* add our latency */
3485 if (min_latency != -1)
3486 min_latency += parse->priv->min_latency;
3487 if (max_latency != -1)
3488 max_latency += parse->priv->max_latency;
3489 GST_OBJECT_UNLOCK (parse);
3491 gst_query_set_latency (query, live, min_latency, max_latency);
3496 res = gst_pad_query_default (pad, parent, query);
3502 /* scans for a cluster start from @pos,
3503 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3504 static GstFlowReturn
3505 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3506 GstClockTime * time, GstClockTime * duration)
3508 GstBaseParseClass *klass;
3510 gboolean orig_drain, orig_discont;
3511 GstFlowReturn ret = GST_FLOW_OK;
3512 GstBuffer *buf = NULL;
3513 GstBaseParseFrame *sframe = NULL;
3515 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3516 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3517 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3519 klass = GST_BASE_PARSE_GET_CLASS (parse);
3521 *time = GST_CLOCK_TIME_NONE;
3522 *duration = GST_CLOCK_TIME_NONE;
3525 orig_offset = parse->priv->offset;
3526 orig_discont = parse->priv->discont;
3527 orig_drain = parse->priv->drain;
3529 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3530 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3532 /* jump elsewhere and locate next frame */
3533 parse->priv->offset = *pos;
3534 /* mark as scanning so frames don't get processed all the way */
3535 parse->priv->scanning = TRUE;
3536 ret = gst_base_parse_scan_frame (parse, klass, FALSE);
3537 parse->priv->scanning = FALSE;
3538 /* retrieve frame found during scan */
3539 sframe = parse->priv->scanned_frame;
3540 parse->priv->scanned_frame = NULL;
3542 if (ret != GST_FLOW_OK || !sframe)
3545 /* get offset first, subclass parsing might dump other stuff in there */
3546 *pos = sframe->offset;
3547 buf = sframe->buffer;
3550 /* but it should provide proper time */
3551 *time = GST_BUFFER_TIMESTAMP (buf);
3552 *duration = GST_BUFFER_DURATION (buf);
3554 GST_LOG_OBJECT (parse,
3555 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3556 GST_TIME_ARGS (*time), *pos);
3560 gst_base_parse_frame_free (sframe);
3563 parse->priv->offset = orig_offset;
3564 parse->priv->discont = orig_discont;
3565 parse->priv->drain = orig_drain;
3570 /* bisect and scan through file for frame starting before @time,
3571 * returns OK and @time/@offset if found, NONE and/or error otherwise
3572 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3573 static GstFlowReturn
3574 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3577 GstFlowReturn ret = GST_FLOW_OK;
3578 gint64 lpos, hpos, newpos;
3579 GstClockTime time, ltime, htime, newtime, dur;
3580 gboolean cont = TRUE;
3581 const GstClockTime tolerance = TARGET_DIFFERENCE;
3582 const guint chunk = 4 * 1024;
3584 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3585 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3587 GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
3588 GST_TIME_ARGS (*_time));
3590 /* TODO also make keyframe aware if useful some day */
3605 /* do not know at first */
3607 *_time = GST_CLOCK_TIME_NONE;
3609 /* need initial positions; start and end */
3610 lpos = parse->priv->first_frame_offset;
3611 ltime = parse->priv->first_frame_ts;
3612 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
3613 GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
3614 return GST_FLOW_ERROR;
3616 hpos = parse->priv->upstream_size;
3618 GST_DEBUG_OBJECT (parse,
3619 "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
3620 ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, htime,
3621 GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
3623 /* check preconditions are satisfied;
3624 * start and end are needed, except for special case where we scan for
3625 * last frame to determine duration */
3626 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
3627 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3628 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3632 /* shortcut cases */
3635 } else if (time < ltime + tolerance) {
3639 } else if (time >= htime) {
3645 while (htime > ltime && cont) {
3646 GST_LOG_OBJECT (parse,
3647 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3648 GST_TIME_ARGS (ltime));
3649 GST_LOG_OBJECT (parse,
3650 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3651 GST_TIME_ARGS (htime));
3652 if (G_UNLIKELY (time == G_MAXINT64)) {
3654 } else if (G_LIKELY (hpos > lpos)) {
3656 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3659 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3661 /* we check this case once, but not forever, so break loop */
3666 newpos = CLAMP (newpos, lpos, hpos);
3667 GST_LOG_OBJECT (parse,
3668 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3669 GST_TIME_ARGS (time), newpos);
3671 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3672 if (ret == GST_FLOW_EOS) {
3673 /* heuristic HACK */
3674 hpos = MAX (lpos, hpos - chunk);
3676 } else if (ret != GST_FLOW_OK) {
3680 if (newtime == -1 || newpos == -1) {
3681 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3685 if (G_UNLIKELY (time == G_MAXINT64)) {
3688 if (GST_CLOCK_TIME_IS_VALID (dur))
3691 } else if (newtime > time) {
3693 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3695 } else if (newtime + tolerance > time) {
3696 /* close enough undershoot */
3700 } else if (newtime < ltime) {
3701 /* so a position beyond lpos resulted in earlier time than ltime ... */
3702 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3705 /* undershoot too far */
3706 newpos += newpos == lpos ? chunk : 0;
3707 lpos = CLAMP (newpos, lpos, hpos);
3713 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3714 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3719 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3720 gboolean before, GstClockTime * _ts)
3722 gint64 bytes = 0, ts = 0;
3723 GstIndexEntry *entry = NULL;
3725 if (time == GST_CLOCK_TIME_NONE) {
3731 GST_BASE_PARSE_INDEX_LOCK (parse);
3732 if (parse->priv->index) {
3733 /* Let's check if we have an index entry for that time */
3734 entry = gst_index_get_assoc_entry (parse->priv->index,
3735 parse->priv->index_id,
3736 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3737 GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3741 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3742 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3744 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3745 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3746 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3748 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3749 GST_TIME_ARGS (time));
3752 ts = GST_CLOCK_TIME_NONE;
3755 GST_BASE_PARSE_INDEX_UNLOCK (parse);
3764 /* returns TRUE if seek succeeded */
3766 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3771 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3772 gboolean flush, update, res = TRUE, accurate;
3773 gint64 cur, stop, seekpos, seekstop;
3774 GstSegment seeksegment = { 0, };
3775 GstClockTime start_ts;
3777 gst_event_parse_seek (event, &rate, &format, &flags,
3778 &cur_type, &cur, &stop_type, &stop);
3780 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3781 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3782 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3783 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3785 /* no negative rates in push mode */
3786 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
3789 if (cur_type != GST_SEEK_TYPE_SET ||
3790 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3793 /* For any format other than TIME, see if upstream handles
3794 * it directly or fail. For TIME, try upstream, but do it ourselves if
3795 * it fails upstream */
3796 res = gst_pad_push_event (parse->sinkpad, event);
3797 if (format != GST_FORMAT_TIME || res)
3800 /* get flush flag */
3801 flush = flags & GST_SEEK_FLAG_FLUSH;
3803 /* copy segment, we need this because we still need the old
3804 * segment when we close the current segment. */
3805 gst_segment_copy_into (&parse->segment, &seeksegment);
3807 GST_DEBUG_OBJECT (parse, "configuring seek");
3808 gst_segment_do_seek (&seeksegment, rate, format, flags,
3809 cur_type, cur, stop_type, stop, &update);
3811 /* accurate seeking implies seek tables are used to obtain position,
3812 * and the requested segment is maintained exactly, not adjusted any way */
3813 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3815 /* maybe we can be accurate for (almost) free */
3816 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
3817 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
3818 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3822 GstClockTime startpos = seeksegment.position;
3824 /* accurate requested, so ... seek a bit before target */
3825 if (startpos < parse->priv->lead_in_ts)
3828 startpos -= parse->priv->lead_in_ts;
3829 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3830 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3833 start_ts = seeksegment.position;
3834 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.position,
3835 GST_FORMAT_BYTES, &seekpos))
3836 goto convert_failed;
3837 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3838 GST_FORMAT_BYTES, &seekstop))
3839 goto convert_failed;
3842 GST_DEBUG_OBJECT (parse,
3843 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3845 GST_DEBUG_OBJECT (parse,
3846 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3847 seeksegment.stop, seekstop);
3849 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
3852 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3855 if (parse->srcpad) {
3856 GST_DEBUG_OBJECT (parse, "sending flush start");
3857 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3858 /* unlock upstream pull_range */
3859 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3862 gst_pad_pause_task (parse->sinkpad);
3865 /* we should now be able to grab the streaming thread because we stopped it
3866 * with the above flush/pause code */
3867 GST_PAD_STREAM_LOCK (parse->sinkpad);
3869 /* save current position */
3870 last_stop = parse->segment.position;
3871 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3874 /* now commit to new position */
3876 /* prepare for streaming again */
3878 GST_DEBUG_OBJECT (parse, "sending flush stop");
3879 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop (TRUE));
3880 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop (TRUE));
3881 gst_base_parse_clear_queues (parse);
3883 /* keep track of our position */
3884 seeksegment.base = gst_segment_to_running_time (&seeksegment,
3885 seeksegment.format, parse->segment.position);
3888 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3890 /* store the newsegment event so it can be sent from the streaming thread. */
3891 /* This will be sent later in _loop() */
3892 parse->priv->pending_segment = TRUE;
3893 parse->priv->pending_events =
3894 g_list_append (parse->priv->pending_events,
3895 gst_event_new_segment (&parse->segment));
3897 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3898 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3899 ", pos = %" GST_TIME_FORMAT, format,
3900 GST_TIME_ARGS (parse->segment.start),
3901 GST_TIME_ARGS (parse->segment.stop),
3902 GST_TIME_ARGS (parse->segment.start));
3904 /* one last chance in pull mode to stay accurate;
3905 * maybe scan and subclass can find where to go */
3908 GstClockTime ts = seeksegment.position;
3910 gst_base_parse_locate_time (parse, &ts, &scanpos);
3914 /* running collected index now consists of several intervals,
3915 * so optimized check no longer possible */
3916 parse->priv->index_last_valid = FALSE;
3917 parse->priv->index_last_offset = 0;
3918 parse->priv->index_last_ts = 0;
3922 /* mark discont if we are going to stream from another position. */
3923 if (seekpos != parse->priv->offset) {
3924 GST_DEBUG_OBJECT (parse,
3925 "mark DISCONT, we did a seek to another position");
3926 parse->priv->offset = seekpos;
3927 parse->priv->last_offset = seekpos;
3928 parse->priv->seen_keyframe = FALSE;
3929 parse->priv->discont = TRUE;
3930 parse->priv->next_ts = start_ts;
3931 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3932 parse->priv->sync_offset = seekpos;
3933 parse->priv->exact_position = accurate;
3936 /* Start streaming thread if paused */
3937 gst_pad_start_task (parse->sinkpad,
3938 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3940 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3945 GstEvent *new_event;
3946 GstBaseParseSeek *seek;
3947 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
3949 /* The only thing we need to do in PUSH-mode is to send the
3950 seek event (in bytes) to upstream. Segment / flush handling happens
3951 in corresponding src event handlers */
3952 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3953 if (seekstop >= 0 && seekstop <= seekpos)
3955 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
3956 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3958 /* store segment info so its precise details can be reconstructed when
3959 * receiving newsegment;
3960 * this matters for all details when accurate seeking,
3961 * is most useful to preserve NONE stop time otherwise */
3962 seek = g_new0 (GstBaseParseSeek, 1);
3963 seek->segment = seeksegment;
3964 seek->accurate = accurate;
3965 seek->offset = seekpos;
3966 seek->start_ts = start_ts;
3967 GST_OBJECT_LOCK (parse);
3968 /* less optimal, but preserves order */
3969 parse->priv->pending_seeks =
3970 g_slist_append (parse->priv->pending_seeks, seek);
3971 GST_OBJECT_UNLOCK (parse);
3973 res = gst_pad_push_event (parse->sinkpad, new_event);
3976 GST_OBJECT_LOCK (parse);
3977 parse->priv->pending_seeks =
3978 g_slist_remove (parse->priv->pending_seeks, seek);
3979 GST_OBJECT_UNLOCK (parse);
3990 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
3996 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
4002 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
4008 /* Checks if bitrates are available from upstream tags so that we don't
4009 * override them later
4012 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
4014 GstTagList *taglist = NULL;
4017 gst_event_parse_tag (event, &taglist);
4019 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
4020 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
4021 parse->priv->post_min_bitrate = FALSE;
4023 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
4024 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
4025 parse->priv->post_avg_bitrate = FALSE;
4027 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
4028 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
4029 parse->priv->post_max_bitrate = FALSE;
4035 gst_base_parse_set_index (GstElement * element, GstIndex * index)
4037 GstBaseParse *parse = GST_BASE_PARSE (element);
4039 GST_BASE_PARSE_INDEX_LOCK (parse);
4040 if (parse->priv->index)
4041 gst_object_unref (parse->priv->index);
4043 parse->priv->index = gst_object_ref (index);
4044 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4045 &parse->priv->index_id);
4046 parse->priv->own_index = FALSE;
4048 parse->priv->index = NULL;
4050 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4054 gst_base_parse_get_index (GstElement * element)
4056 GstBaseParse *parse = GST_BASE_PARSE (element);
4057 GstIndex *result = NULL;
4059 GST_BASE_PARSE_INDEX_LOCK (parse);
4060 if (parse->priv->index)
4061 result = gst_object_ref (parse->priv->index);
4062 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4068 static GstStateChangeReturn
4069 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4071 GstBaseParse *parse;
4072 GstStateChangeReturn result;
4074 parse = GST_BASE_PARSE (element);
4076 switch (transition) {
4077 case GST_STATE_CHANGE_READY_TO_PAUSED:
4078 /* If this is our own index destroy it as the
4079 * old entries might be wrong for the new stream */
4080 GST_BASE_PARSE_INDEX_LOCK (parse);
4081 if (parse->priv->own_index) {
4082 gst_object_unref (parse->priv->index);
4083 parse->priv->index = NULL;
4084 parse->priv->own_index = FALSE;
4087 /* If no index was created, generate one */
4088 if (G_UNLIKELY (!parse->priv->index)) {
4089 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4091 parse->priv->index = g_object_new (gst_mem_index_get_type (), NULL);
4092 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4093 &parse->priv->index_id);
4094 parse->priv->own_index = TRUE;
4096 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4102 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4104 switch (transition) {
4105 case GST_STATE_CHANGE_PAUSED_TO_READY:
4106 gst_base_parse_reset (parse);