2 * Copyright (C) 2008 Nokia Corporation. All rights reserved.
3 * Contact: Stefan Kost <stefan.kost@nokia.com>
4 * Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
5 * Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
6 * Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
25 * SECTION:gstbaseparse
26 * @short_description: Base class for stream parsers
27 * @see_also: #GstBaseTransform
29 * This base class is for parser elements that process data and splits it
30 * into separate audio/video/whatever frames.
34 * <listitem><para>provides one sink pad and one source pad</para></listitem>
35 * <listitem><para>handles state changes</para></listitem>
36 * <listitem><para>can operate in pull mode or push mode</para></listitem>
37 * <listitem><para>handles seeking in both modes</para></listitem>
38 * <listitem><para>handles events (NEWSEGMENT/EOS/FLUSH)</para></listitem>
40 * handles queries (POSITION/DURATION/SEEKING/FORMAT/CONVERT)
42 * <listitem><para>handles flushing</para></listitem>
45 * The purpose of this base class is to provide the basic functionality of
46 * a parser and share a lot of rather complex code.
48 * Description of the parsing mechanism:
51 * <itemizedlist><title>Set-up phase</title>
53 * GstBaseParse calls @start to inform subclass that data processing is
57 * GstBaseParse class calls @set_sink_caps to inform the subclass about
58 * incoming sinkpad caps. Subclass could already set the srcpad caps
59 * accordingly, but this might be delayed until calling
60 * gst_base_parse_finish_frame() with a non-queued frame.
63 * At least at this point subclass needs to tell the GstBaseParse class
64 * how big data chunks it wants to receive (min_frame_size). It can do
65 * this with gst_base_parse_set_min_frame_size().
68 * GstBaseParse class sets up appropriate data passing mode (pull/push)
69 * and starts to process the data.
75 * <title>Parsing phase</title>
77 * GstBaseParse gathers at least min_frame_size bytes of data either
78 * by pulling it from upstream or collecting buffers in an internal
82 * A buffer of (at least) min_frame_size bytes is passed to subclass with
83 * @handle_frame. Subclass checks the contents and can optionally
84 * return GST_FLOW_OK along with an amount of data to be skipped to find
85 * a valid frame (which will result in a subsequent DISCONT).
86 * If, otherwise, the buffer does not hold a complete frame,
87 * @handle_frame can merely return and will be called again when additional
88 * data is available. In push mode this amounts to an
89 * additional input buffer (thus minimal additional latency), in pull mode
90 * this amounts to some arbitrary reasonable buffer size increase.
91 * Of course, gst_base_parse_set_min_size() could also be used if a very
92 * specific known amount of additional data is required.
93 * If, however, the buffer holds a complete valid frame, it can pass
94 * the size of this frame to gst_base_parse_finish_frame().
95 * If acting as a converter, it can also merely indicate consumed input data
96 * while simultaneously providing custom output data.
97 * Note that baseclass performs some processing (such as tracking
98 * overall consumed data rate versus duration) for each finished frame,
99 * but other state is only updated upon each call to @handle_frame
100 * (such as tracking upstream input timestamp).
102 * Subclass is also responsible for setting the buffer metadata
103 * (e.g. buffer timestamp and duration, or keyframe if applicable).
104 * (although the latter can also be done by GstBaseParse if it is
105 * appropriately configured, see below). Frame is provided with
106 * timestamp derived from upstream (as much as generally possible),
107 * duration obtained from configuration (see below), and offset
108 * if meaningful (in pull mode).
110 * Note that @check_valid_frame might receive any small
111 * amount of input data when leftover data is being drained (e.g. at EOS).
114 * As part of finish frame processing,
115 * just prior to actually pushing the buffer in question,
116 * it is passed to @pre_push_frame which gives subclass yet one
117 * last chance to examine buffer metadata, or to send some custom (tag)
118 * events, or to perform custom (segment) filtering.
121 * During the parsing process GstBaseParseClass will handle both srcpad
122 * and sinkpad events. They will be passed to subclass if @event or
123 * @src_event callbacks have been provided.
128 * <itemizedlist><title>Shutdown phase</title>
130 * GstBaseParse class calls @stop to inform the subclass that data
131 * parsing will be stopped.
137 * Subclass is responsible for providing pad template caps for
138 * source and sink pads. The pads need to be named "sink" and "src". It also
139 * needs to set the fixed caps on srcpad, when the format is ensured (e.g.
140 * when base class calls subclass' @set_sink_caps function).
142 * This base class uses #GST_FORMAT_DEFAULT as a meaning of frames. So,
143 * subclass conversion routine needs to know that conversion from
144 * #GST_FORMAT_TIME to #GST_FORMAT_DEFAULT must return the
145 * frame number that can be found from the given byte position.
147 * GstBaseParse uses subclasses conversion methods also for seeking (or
148 * otherwise uses its own default one, see also below).
150 * Subclass @start and @stop functions will be called to inform the beginning
151 * and end of data processing.
153 * Things that subclass need to take care of:
155 * <listitem><para>Provide pad templates</para></listitem>
157 * Fixate the source pad caps when appropriate
160 * Inform base class how big data chunks should be retrieved. This is
161 * done with gst_base_parse_set_min_frame_size() function.
164 * Examine data chunks passed to subclass with @handle_frame and pass
165 * proper frame(s) to gst_base_parse_finish_frame(), and setting src pad
166 * caps and timestamps on frame.
168 * <listitem><para>Provide conversion functions</para></listitem>
170 * Update the duration information with gst_base_parse_set_duration()
173 * Optionally passthrough using gst_base_parse_set_passthrough()
176 * Configure various baseparse parameters using
177 * gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
178 * and gst_base_parse_set_frame_rate().
181 * In particular, if subclass is unable to determine a duration, but
182 * parsing (or specs) yields a frames per seconds rate, then this can be
183 * provided to GstBaseParse to enable it to cater for
184 * buffer time metadata (which will be taken from upstream as much as
185 * possible). Internally keeping track of frame durations and respective
186 * sizes that have been pushed provides GstBaseParse with an estimated
187 * bitrate. A default @convert (used if not overriden) will then use these
188 * rates to perform obvious conversions. These rates are also used to
189 * update (estimated) duration at regular frame intervals.
196 * - In push mode provide a queue of adapter-"queued" buffers for upstream
198 * - Queue buffers/events until caps are set
208 #include <gst/base/gstadapter.h>
210 #include "gstbaseparse.h"
212 /* FIXME: get rid of old GstIndex code */
213 #include "gstindex.h"
214 #include "gstindex.c"
215 #include "gstmemindex.c"
217 #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
219 #define MIN_FRAMES_TO_POST_BITRATE 10
220 #define TARGET_DIFFERENCE (20 * GST_SECOND)
222 GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
223 #define GST_CAT_DEFAULT gst_base_parse_debug
225 /* Supported formats */
226 static const GstFormat fmtlist[] = {
233 #define GST_BASE_PARSE_GET_PRIVATE(obj) \
234 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
236 struct _GstBaseParsePrivate
243 GstFormat duration_fmt;
244 gint64 estimated_duration;
245 gint64 estimated_drift;
247 guint min_frame_size;
248 gboolean passthrough;
250 gboolean has_timing_info;
251 guint fps_num, fps_den;
252 gint update_interval;
254 guint lead_in, lead_out;
255 GstClockTime lead_in_ts, lead_out_ts;
256 GstClockTime min_latency, max_latency;
264 GstClockTime next_ts;
265 GstClockTime prev_ts;
266 GstClockTime frame_duration;
267 gboolean seen_keyframe;
273 guint64 data_bytecount;
274 guint64 acc_duration;
275 GstClockTime first_frame_ts;
276 gint64 first_frame_offset;
278 gboolean post_min_bitrate;
279 gboolean post_avg_bitrate;
280 gboolean post_max_bitrate;
284 guint posted_avg_bitrate;
286 GList *pending_events;
288 /* frames/buffers that are queued and ready to go on OK */
289 GQueue queued_frames;
293 /* index entry storage, either ours or provided */
299 /* seek table entries only maintained if upstream is BYTE seekable */
300 gboolean upstream_seekable;
301 gboolean upstream_has_duration;
302 gint64 upstream_size;
303 /* minimum distance between two index entries */
304 GstClockTimeDiff idx_interval;
305 /* ts and offset of last entry added */
306 GstClockTime index_last_ts;
307 gint64 index_last_offset;
308 gboolean index_last_valid;
310 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
311 gboolean exact_position;
312 /* seek events are temporarily kept to match them with newsegments */
313 GSList *pending_seeks;
315 /* reverse playback */
316 GSList *buffers_pending;
317 GSList *buffers_head;
318 GSList *buffers_queued;
319 GSList *buffers_send;
320 GstClockTime last_ts;
323 /* Newsegment event to be sent after SEEK */
324 GstEvent *pending_segment;
326 /* frame previously passed to subclass (might be re-used) */
327 GstBaseParseFrame *prev_frame;
328 /* offset corresponding to above frame */
330 /* whether we are merely scanning for a frame */
332 /* ... and resulting frame, if any */
333 GstBaseParseFrame *scanned_frame;
335 /* TRUE if we're still detecting the format, i.e.
336 * if ::detect() is still called for future buffers */
338 GList *detect_buffers;
339 guint detect_buffers_size;
342 typedef struct _GstBaseParseSeek
347 GstClockTime start_ts;
350 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
351 g_mutex_lock (&parse->priv->index_lock);
352 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
353 g_mutex_unlock (&parse->priv->index_lock);
355 static GstElementClass *parent_class = NULL;
357 static void gst_base_parse_class_init (GstBaseParseClass * klass);
358 static void gst_base_parse_init (GstBaseParse * parse,
359 GstBaseParseClass * klass);
362 gst_base_parse_get_type (void)
364 static volatile gsize base_parse_type = 0;
366 if (g_once_init_enter (&base_parse_type)) {
367 static const GTypeInfo base_parse_info = {
368 sizeof (GstBaseParseClass),
369 (GBaseInitFunc) NULL,
370 (GBaseFinalizeFunc) NULL,
371 (GClassInitFunc) gst_base_parse_class_init,
374 sizeof (GstBaseParse),
376 (GInstanceInitFunc) gst_base_parse_init,
380 _type = g_type_register_static (GST_TYPE_ELEMENT,
381 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
382 g_once_init_leave (&base_parse_type, _type);
384 return (GType) base_parse_type;
387 static void gst_base_parse_finalize (GObject * object);
389 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
390 GstStateChange transition);
391 static void gst_base_parse_reset (GstBaseParse * parse);
394 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
395 static GstIndex *gst_base_parse_get_index (GstElement * element);
398 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
400 static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
401 GstObject * parent, GstPadMode mode, gboolean active);
402 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
404 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
406 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
408 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
411 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
413 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
416 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
418 static void gst_base_parse_loop (GstPad * pad);
420 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
421 GstBaseParseFrame * frame);
423 static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse,
426 static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse,
429 static void gst_base_parse_drain (GstBaseParse * parse);
431 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
432 gboolean post_min, gboolean post_avg, gboolean post_max);
434 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
435 GstClockTime time, gboolean before, GstClockTime * _ts);
436 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
437 GstClockTime * _time, gint64 * _offset);
439 static GstFlowReturn gst_base_parse_start_fragment (GstBaseParse * parse);
440 static GstFlowReturn gst_base_parse_finish_fragment (GstBaseParse * parse,
443 static inline GstFlowReturn gst_base_parse_check_sync (GstBaseParse * parse);
445 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
448 gst_base_parse_clear_queues (GstBaseParse * parse)
450 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
451 g_slist_free (parse->priv->buffers_queued);
452 parse->priv->buffers_queued = NULL;
453 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
455 g_slist_free (parse->priv->buffers_pending);
456 parse->priv->buffers_pending = NULL;
457 g_slist_foreach (parse->priv->buffers_head, (GFunc) gst_buffer_unref, NULL);
458 g_slist_free (parse->priv->buffers_head);
459 parse->priv->buffers_head = NULL;
460 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
461 g_slist_free (parse->priv->buffers_send);
462 parse->priv->buffers_send = NULL;
464 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
465 g_list_free (parse->priv->detect_buffers);
466 parse->priv->detect_buffers = NULL;
467 parse->priv->detect_buffers_size = 0;
469 g_queue_foreach (&parse->priv->queued_frames,
470 (GFunc) gst_base_parse_frame_free, NULL);
471 g_queue_clear (&parse->priv->queued_frames);
475 gst_base_parse_finalize (GObject * object)
477 GstBaseParse *parse = GST_BASE_PARSE (object);
480 g_object_unref (parse->priv->adapter);
482 if (parse->priv->pending_segment) {
483 p_ev = &parse->priv->pending_segment;
484 gst_event_replace (p_ev, NULL);
487 if (parse->priv->cache) {
488 gst_buffer_unref (parse->priv->cache);
489 parse->priv->cache = NULL;
492 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
494 g_list_free (parse->priv->pending_events);
495 parse->priv->pending_events = NULL;
497 if (parse->priv->index) {
498 gst_object_unref (parse->priv->index);
499 parse->priv->index = NULL;
501 g_mutex_clear (&parse->priv->index_lock);
503 gst_base_parse_clear_queues (parse);
505 G_OBJECT_CLASS (parent_class)->finalize (object);
509 gst_base_parse_class_init (GstBaseParseClass * klass)
511 GObjectClass *gobject_class;
512 GstElementClass *gstelement_class;
514 gobject_class = G_OBJECT_CLASS (klass);
515 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
516 parent_class = g_type_class_peek_parent (klass);
517 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
519 gstelement_class = (GstElementClass *) klass;
520 gstelement_class->change_state =
521 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
524 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
525 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
528 /* Default handlers */
529 klass->event = gst_base_parse_sink_eventfunc;
530 klass->src_event = gst_base_parse_src_eventfunc;
531 klass->convert = gst_base_parse_convert_default;
533 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
534 "baseparse element");
538 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
540 GstPadTemplate *pad_template;
542 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
544 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
547 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
548 g_return_if_fail (pad_template != NULL);
549 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
550 gst_pad_set_event_function (parse->sinkpad,
551 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
552 gst_pad_set_query_function (parse->sinkpad,
553 GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
554 gst_pad_set_chain_function (parse->sinkpad,
555 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
556 gst_pad_set_activate_function (parse->sinkpad,
557 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
558 gst_pad_set_activatemode_function (parse->sinkpad,
559 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
560 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
562 GST_DEBUG_OBJECT (parse, "sinkpad created");
565 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
566 g_return_if_fail (pad_template != NULL);
567 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
568 gst_pad_set_event_function (parse->srcpad,
569 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
570 gst_pad_set_query_function (parse->srcpad,
571 GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
572 gst_pad_use_fixed_caps (parse->srcpad);
573 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
574 GST_DEBUG_OBJECT (parse, "src created");
576 g_queue_init (&parse->priv->queued_frames);
578 parse->priv->adapter = gst_adapter_new ();
580 parse->priv->pad_mode = GST_PAD_MODE_NONE;
582 g_mutex_init (&parse->priv->index_lock);
585 gst_base_parse_reset (parse);
586 GST_DEBUG_OBJECT (parse, "init ok");
588 GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE);
591 static GstBaseParseFrame *
592 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
594 GstBaseParseFrame *copy;
596 copy = g_slice_dup (GstBaseParseFrame, frame);
597 copy->buffer = gst_buffer_ref (frame->buffer);
598 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
600 GST_TRACE ("copied frame %p -> %p", frame, copy);
606 gst_base_parse_frame_free (GstBaseParseFrame * frame)
608 GST_TRACE ("freeing frame %p", frame);
611 gst_buffer_unref (frame->buffer);
612 frame->buffer = NULL;
615 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
616 g_slice_free (GstBaseParseFrame, frame);
618 memset (frame, 0, sizeof (*frame));
622 G_DEFINE_BOXED_TYPE (GstBaseParseFrame, gst_base_parse_frame,
623 (GBoxedCopyFunc) gst_base_parse_frame_copy,
624 (GBoxedFreeFunc) gst_base_parse_frame_free);
627 * gst_base_parse_frame_init:
628 * @frame: #GstBaseParseFrame.
630 * Sets a #GstBaseParseFrame to initial state. Currently this means
631 * all public fields are zero-ed and a private flag is set to make
632 * sure gst_base_parse_frame_free() only frees the contents but not
633 * the actual frame. Use this function to initialise a #GstBaseParseFrame
634 * allocated on the stack.
639 gst_base_parse_frame_init (GstBaseParseFrame * frame)
641 memset (frame, 0, sizeof (GstBaseParseFrame));
642 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
643 GST_TRACE ("inited frame %p", frame);
647 * gst_base_parse_frame_new:
648 * @buffer: (transfer none): a #GstBuffer
650 * @overhead: number of bytes in this frame which should be counted as
651 * metadata overhead, ie. not used to calculate the average bitrate.
652 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
654 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
655 * elements written in C should usually allocate the frame on the stack and
656 * then use gst_base_parse_frame_init() to initialise it.
658 * Returns: a newly-allocated #GstBaseParseFrame. Free with
659 * gst_base_parse_frame_free() when no longer needed, unless you gave
660 * away ownership to gst_base_parse_push_frame().
665 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
668 GstBaseParseFrame *frame;
670 frame = g_slice_new0 (GstBaseParseFrame);
671 frame->buffer = gst_buffer_ref (buffer);
673 GST_TRACE ("created frame %p", frame);
678 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
681 gst_buffer_replace (&frame->buffer, buf);
685 /* set flags one by one for clarity */
686 if (G_UNLIKELY (parse->priv->drain))
687 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
689 /* losing sync is pretty much a discont (and vice versa), no ? */
690 if (G_UNLIKELY (parse->priv->discont))
691 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
695 gst_base_parse_reset (GstBaseParse * parse)
697 GST_OBJECT_LOCK (parse);
698 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
699 parse->priv->duration = -1;
700 parse->priv->min_frame_size = 1;
701 parse->priv->discont = TRUE;
702 parse->priv->flushing = FALSE;
703 parse->priv->offset = 0;
704 parse->priv->sync_offset = 0;
705 parse->priv->update_interval = -1;
706 parse->priv->fps_num = parse->priv->fps_den = 0;
707 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
708 parse->priv->lead_in = parse->priv->lead_out = 0;
709 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
710 parse->priv->bitrate = 0;
711 parse->priv->framecount = 0;
712 parse->priv->bytecount = 0;
713 parse->priv->acc_duration = 0;
714 parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE;
715 parse->priv->first_frame_offset = -1;
716 parse->priv->estimated_duration = -1;
717 parse->priv->estimated_drift = 0;
718 parse->priv->next_ts = 0;
719 parse->priv->syncable = TRUE;
720 parse->priv->passthrough = FALSE;
721 parse->priv->has_timing_info = FALSE;
722 parse->priv->post_min_bitrate = TRUE;
723 parse->priv->post_avg_bitrate = TRUE;
724 parse->priv->post_max_bitrate = TRUE;
725 parse->priv->min_bitrate = G_MAXUINT;
726 parse->priv->max_bitrate = 0;
727 parse->priv->avg_bitrate = 0;
728 parse->priv->posted_avg_bitrate = 0;
730 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
731 parse->priv->index_last_offset = -1;
732 parse->priv->index_last_valid = TRUE;
733 parse->priv->upstream_seekable = FALSE;
734 parse->priv->upstream_size = 0;
735 parse->priv->upstream_has_duration = FALSE;
736 parse->priv->idx_interval = 0;
737 parse->priv->exact_position = TRUE;
738 parse->priv->seen_keyframe = FALSE;
740 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
741 parse->priv->last_offset = 0;
743 if (parse->priv->pending_segment) {
744 gst_event_unref (parse->priv->pending_segment);
745 parse->priv->pending_segment = NULL;
748 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
750 g_list_free (parse->priv->pending_events);
751 parse->priv->pending_events = NULL;
753 if (parse->priv->cache) {
754 gst_buffer_unref (parse->priv->cache);
755 parse->priv->cache = NULL;
758 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
759 g_slist_free (parse->priv->pending_seeks);
760 parse->priv->pending_seeks = NULL;
762 if (parse->priv->adapter)
763 gst_adapter_clear (parse->priv->adapter);
765 /* we know it is not alloc'ed, but maybe other stuff to free, some day ... */
766 if (parse->priv->prev_frame) {
767 gst_base_parse_frame_free (parse->priv->prev_frame);
768 parse->priv->prev_frame = NULL;
771 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
772 g_list_free (parse->priv->detect_buffers);
773 parse->priv->detect_buffers = NULL;
774 parse->priv->detect_buffers_size = 0;
775 GST_OBJECT_UNLOCK (parse);
778 /* gst_base_parse_parse_frame:
779 * @parse: #GstBaseParse.
780 * @buffer: #GstBuffer.
782 * Default callback for parse_frame.
785 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
787 GstBuffer *buffer = frame->buffer;
789 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
790 GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) {
791 GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts;
793 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
794 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
795 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
800 /* gst_base_parse_convert:
801 * @parse: #GstBaseParse.
802 * @src_format: #GstFormat describing the source format.
803 * @src_value: Source value to be converted.
804 * @dest_format: #GstFormat defining the converted format.
805 * @dest_value: Pointer where the conversion result will be put.
807 * Converts using configured "convert" vmethod in #GstBaseParse class.
809 * Returns: TRUE if conversion was successful.
812 gst_base_parse_convert (GstBaseParse * parse,
813 GstFormat src_format,
814 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
816 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
819 g_return_val_if_fail (dest_value != NULL, FALSE);
824 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
826 #ifndef GST_DISABLE_GST_DEBUG
829 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
830 GST_LOG_OBJECT (parse,
831 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
832 GST_TIME_ARGS (src_value), *dest_value);
833 } else if (dest_format == GST_FORMAT_TIME &&
834 src_format == GST_FORMAT_BYTES) {
835 GST_LOG_OBJECT (parse,
836 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
837 src_value, GST_TIME_ARGS (*dest_value));
839 GST_LOG_OBJECT (parse,
840 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
841 GST_STR_NULL (gst_format_get_name (src_format)),
842 GST_STR_NULL (gst_format_get_name (dest_format)),
843 src_value, *dest_value);
846 GST_DEBUG_OBJECT (parse, "conversion failed");
854 /* gst_base_parse_sink_event:
855 * @pad: #GstPad that received the event.
856 * @event: #GstEvent to be handled.
858 * Handler for sink pad events.
860 * Returns: TRUE if the event was handled.
863 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
866 GstBaseParseClass *bclass;
869 parse = GST_BASE_PARSE (parent);
870 bclass = GST_BASE_PARSE_GET_CLASS (parse);
872 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
873 GST_EVENT_TYPE_NAME (event));
875 /* Cache all events except EOS, SEGMENT and FLUSH_STOP if we have a
877 if (parse->priv->pending_segment && GST_EVENT_TYPE (event) != GST_EVENT_EOS
878 && GST_EVENT_TYPE (event) != GST_EVENT_SEGMENT
879 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
880 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP
881 && GST_EVENT_TYPE (event) != GST_EVENT_CAPS) {
883 if (GST_EVENT_TYPE (event) == GST_EVENT_TAG)
884 /* See if any bitrate tags were posted */
885 gst_base_parse_handle_tag (parse, event);
887 parse->priv->pending_events =
888 g_list_append (parse->priv->pending_events, event);
892 if (GST_EVENT_TYPE (event) == GST_EVENT_EOS &&
893 parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
894 /* We've not posted bitrate tags yet - do so now */
895 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
898 ret = bclass->event (parse, 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)
926 switch (GST_EVENT_TYPE (event)) {
930 GstBaseParseClass *klass;
932 klass = GST_BASE_PARSE_GET_CLASS (parse);
934 gst_event_parse_caps (event, &caps);
935 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
937 if (klass->set_sink_caps)
938 ret = klass->set_sink_caps (parse, caps);
942 /* will send our own caps downstream */
943 gst_event_unref (event);
946 case GST_EVENT_SEGMENT:
948 const GstSegment *in_segment;
949 GstSegment out_segment;
950 gint64 offset = 0, next_ts;
953 gdouble rate, applied_rate;
955 gint64 start, stop, pos, next_ts;
959 gst_event_parse_segment (event, &in_segment);
960 gst_segment_init (&out_segment, GST_FORMAT_TIME);
962 GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
964 if (in_segment->format == GST_FORMAT_BYTES) {
965 GstBaseParseSeek *seek = NULL;
968 /* stop time is allowed to be open-ended, but not start & pos */
969 offset = in_segment->time;
971 GST_OBJECT_LOCK (parse);
972 for (node = parse->priv->pending_seeks; node; node = node->next) {
973 GstBaseParseSeek *tmp = node->data;
975 if (tmp->offset == offset) {
980 parse->priv->pending_seeks =
981 g_slist_remove (parse->priv->pending_seeks, seek);
982 GST_OBJECT_UNLOCK (parse);
985 GST_DEBUG_OBJECT (parse,
986 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
987 seek->accurate ? " accurate" : "", &seek->segment);
989 out_segment.start = seek->segment.start;
990 out_segment.stop = seek->segment.stop;
991 out_segment.time = seek->segment.start;
993 next_ts = seek->start_ts;
994 parse->priv->exact_position = seek->accurate;
997 /* best attempt convert */
998 /* as these are only estimates, stop is kept open-ended to avoid
999 * premature cutting */
1000 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
1001 GST_FORMAT_TIME, (gint64 *) & next_ts);
1003 out_segment.start = next_ts;
1004 out_segment.stop = GST_CLOCK_TIME_NONE;
1005 out_segment.time = next_ts;
1007 parse->priv->exact_position = (in_segment->start == 0);
1010 gst_event_unref (event);
1012 event = gst_event_new_segment (&out_segment);
1014 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1015 GST_SEGMENT_FORMAT, in_segment);
1017 } else if (in_segment->format != GST_FORMAT_TIME) {
1018 /* Unknown incoming segment format. Output a default open-ended
1020 gst_event_unref (event);
1022 out_segment.start = 0;
1023 out_segment.stop = GST_CLOCK_TIME_NONE;
1024 out_segment.time = 0;
1026 event = gst_event_new_segment (&out_segment);
1030 /* not considered BYTE seekable if it is talking to us in TIME,
1031 * whatever else it might claim */
1032 parse->priv->upstream_seekable = FALSE;
1033 next_ts = in_segment->start;
1036 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1039 gst_segment_set_newsegment (&parse->segment, update, rate,
1040 applied_rate, format, start, stop, start);
1043 /* save the segment for later, right before we push a new buffer so that
1044 * the caps are fixed and the next linked element can receive
1046 eventp = &parse->priv->pending_segment;
1047 gst_event_replace (eventp, event);
1048 gst_event_unref (event);
1051 /* but finish the current segment */
1052 GST_DEBUG_OBJECT (parse, "draining current segment");
1053 if (in_segment->rate > 0.0)
1054 gst_base_parse_drain (parse);
1056 gst_base_parse_finish_fragment (parse, FALSE);
1057 gst_adapter_clear (parse->priv->adapter);
1059 parse->priv->offset = offset;
1060 parse->priv->sync_offset = offset;
1061 parse->priv->next_ts = next_ts;
1062 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1063 parse->priv->discont = TRUE;
1064 parse->priv->seen_keyframe = FALSE;
1068 case GST_EVENT_FLUSH_START:
1069 parse->priv->flushing = TRUE;
1070 ret = gst_pad_push_event (parse->srcpad, event);
1071 /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
1072 GST_PAD_STREAM_LOCK (parse->srcpad);
1073 GST_PAD_STREAM_UNLOCK (parse->srcpad);
1076 case GST_EVENT_FLUSH_STOP:
1077 ret = gst_pad_push_event (parse->srcpad, event);
1078 gst_adapter_clear (parse->priv->adapter);
1079 gst_base_parse_clear_queues (parse);
1080 parse->priv->flushing = FALSE;
1081 parse->priv->discont = TRUE;
1082 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1083 if (parse->priv->prev_frame) {
1084 gst_base_parse_frame_free (parse->priv->prev_frame);
1085 parse->priv->prev_frame = NULL;
1090 if (parse->segment.rate > 0.0)
1091 gst_base_parse_drain (parse);
1093 gst_base_parse_finish_fragment (parse, TRUE);
1095 /* If we STILL have zero frames processed, fire an error */
1096 if (parse->priv->framecount == 0) {
1097 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1098 ("No valid frames found before end of stream"), (NULL));
1100 /* newsegment before eos */
1101 if (parse->priv->pending_segment) {
1102 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
1103 parse->priv->pending_segment = NULL;
1105 ret = gst_pad_push_event (parse->srcpad, event);
1110 gst_pad_event_default (parse->sinkpad, GST_OBJECT_CAST (parse),
1118 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1120 GstBaseParse *parse;
1121 GstBaseParseClass *bclass;
1124 parse = GST_BASE_PARSE (parent);
1125 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1127 switch (GST_QUERY_TYPE (query)) {
1128 case GST_QUERY_CAPS:
1130 if (bclass->get_sink_caps) {
1131 GstCaps *caps, *filter;
1133 gst_query_parse_caps (query, &filter);
1134 caps = bclass->get_sink_caps (parse, filter);
1135 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1137 gst_query_set_caps_result (query, caps);
1138 gst_caps_unref (caps);
1142 GstCaps *caps, *template_caps, *filter;
1144 gst_query_parse_caps (query, &filter);
1145 template_caps = gst_pad_get_pad_template_caps (pad);
1146 if (filter != NULL) {
1148 gst_caps_intersect_full (filter, template_caps,
1149 GST_CAPS_INTERSECT_FIRST);
1150 gst_caps_unref (template_caps);
1152 caps = template_caps;
1154 gst_query_set_caps_result (query, caps);
1155 gst_caps_unref (caps);
1163 res = gst_pad_query_default (pad, parent, query);
1172 /* gst_base_parse_src_event:
1173 * @pad: #GstPad that received the event.
1174 * @event: #GstEvent that was received.
1176 * Handler for source pad events.
1178 * Returns: TRUE if the event was handled.
1181 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1183 GstBaseParse *parse;
1184 GstBaseParseClass *bclass;
1185 gboolean ret = TRUE;
1187 parse = GST_BASE_PARSE (parent);
1188 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1190 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1191 GST_EVENT_TYPE_NAME (event));
1193 if (bclass->src_event)
1194 ret = bclass->src_event (parse, event);
1196 gst_event_unref (event);
1202 gst_base_parse_is_seekable (GstBaseParse * parse)
1204 /* FIXME: could do more here, e.g. check index or just send data from 0
1205 * in pull mode and let decoder/sink clip */
1206 return parse->priv->syncable;
1209 /* gst_base_parse_src_eventfunc:
1210 * @parse: #GstBaseParse.
1211 * @event: #GstEvent that was received.
1213 * Default srcpad event handler.
1215 * Returns: TRUE if the event was handled and can be dropped.
1218 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1220 gboolean res = FALSE;
1222 switch (GST_EVENT_TYPE (event)) {
1223 case GST_EVENT_SEEK:
1224 if (gst_base_parse_is_seekable (parse))
1225 res = gst_base_parse_handle_seek (parse, event);
1228 res = gst_pad_event_default (parse->srcpad, GST_OBJECT_CAST (parse),
1237 * gst_base_parse_convert_default:
1238 * @parse: #GstBaseParse.
1239 * @src_format: #GstFormat describing the source format.
1240 * @src_value: Source value to be converted.
1241 * @dest_format: #GstFormat defining the converted format.
1242 * @dest_value: Pointer where the conversion result will be put.
1244 * Default implementation of "convert" vmethod in #GstBaseParse class.
1246 * Returns: TRUE if conversion was successful.
1251 gst_base_parse_convert_default (GstBaseParse * parse,
1252 GstFormat src_format,
1253 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1255 gboolean ret = FALSE;
1256 guint64 bytes, duration;
1258 if (G_UNLIKELY (src_format == dest_format)) {
1259 *dest_value = src_value;
1263 if (G_UNLIKELY (src_value == -1)) {
1268 if (G_UNLIKELY (src_value == 0)) {
1273 /* need at least some frames */
1274 if (!parse->priv->framecount)
1277 duration = parse->priv->acc_duration / GST_MSECOND;
1278 bytes = parse->priv->bytecount;
1280 if (G_UNLIKELY (!duration || !bytes))
1281 goto no_duration_bytes;
1283 if (src_format == GST_FORMAT_BYTES) {
1284 if (dest_format == GST_FORMAT_TIME) {
1285 /* BYTES -> TIME conversion */
1286 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1287 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1288 *dest_value *= GST_MSECOND;
1289 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1290 *dest_value / GST_MSECOND);
1293 GST_DEBUG_OBJECT (parse, "converting bytes -> other not implemented");
1295 } else if (src_format == GST_FORMAT_TIME) {
1296 if (dest_format == GST_FORMAT_BYTES) {
1297 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1298 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1300 GST_DEBUG_OBJECT (parse,
1301 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1302 src_value / GST_MSECOND, *dest_value);
1305 GST_DEBUG_OBJECT (parse, "converting time -> other not implemented");
1307 } else if (src_format == GST_FORMAT_DEFAULT) {
1308 /* DEFAULT == frame-based */
1309 if (dest_format == GST_FORMAT_TIME) {
1310 GST_DEBUG_OBJECT (parse, "converting default -> time");
1311 if (parse->priv->fps_den) {
1312 *dest_value = gst_util_uint64_scale (src_value,
1313 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1317 GST_DEBUG_OBJECT (parse, "converting default -> other not implemented");
1320 GST_DEBUG_OBJECT (parse, "conversion not implemented");
1327 GST_DEBUG_OBJECT (parse, "no framecount");
1332 GST_DEBUG_OBJECT (parse, "no duration %" G_GUINT64_FORMAT ", bytes %"
1333 G_GUINT64_FORMAT, duration, bytes);
1340 gst_base_parse_update_duration (GstBaseParse * baseparse)
1343 GstBaseParse *parse;
1345 parse = GST_BASE_PARSE (baseparse);
1347 peer = gst_pad_get_peer (parse->sinkpad);
1349 gboolean qres = FALSE;
1350 gint64 ptot, dest_value;
1352 qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot);
1353 gst_object_unref (GST_OBJECT (peer));
1355 if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1356 GST_FORMAT_TIME, &dest_value)) {
1358 /* inform if duration changed, but try to avoid spamming */
1359 parse->priv->estimated_drift +=
1360 dest_value - parse->priv->estimated_duration;
1361 if (parse->priv->estimated_drift > GST_SECOND ||
1362 parse->priv->estimated_drift < -GST_SECOND) {
1363 gst_element_post_message (GST_ELEMENT (parse),
1364 gst_message_new_duration (GST_OBJECT (parse),
1365 GST_FORMAT_TIME, dest_value));
1366 parse->priv->estimated_drift = 0;
1368 parse->priv->estimated_duration = dest_value;
1369 GST_LOG_OBJECT (parse,
1370 "updated estimated duration to %" GST_TIME_FORMAT,
1371 GST_TIME_ARGS (dest_value));
1378 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1379 gboolean post_avg, gboolean post_max)
1381 GstTagList *taglist = NULL;
1383 if (post_min && parse->priv->post_min_bitrate) {
1384 taglist = gst_tag_list_new_empty ();
1386 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1387 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1390 if (post_avg && parse->priv->post_avg_bitrate) {
1391 if (taglist == NULL)
1392 taglist = gst_tag_list_new_empty ();
1394 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1395 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1396 parse->priv->avg_bitrate, NULL);
1399 if (post_max && parse->priv->post_max_bitrate) {
1400 if (taglist == NULL)
1401 taglist = gst_tag_list_new_empty ();
1403 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1404 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1407 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1408 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1409 parse->priv->max_bitrate);
1411 if (taglist != NULL) {
1412 gst_pad_push_event (parse->srcpad, gst_event_new_tag (taglist));
1416 /* gst_base_parse_update_bitrates:
1417 * @parse: #GstBaseParse.
1418 * @buffer: Current frame as a #GstBuffer
1420 * Keeps track of the minimum and maximum bitrates, and also maintains a
1421 * running average bitrate of the stream so far.
1424 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1426 /* Only update the tag on a 10 kbps delta */
1427 static const gint update_threshold = 10000;
1429 guint64 data_len, frame_dur;
1430 gint overhead, frame_bitrate, old_avg_bitrate;
1431 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1432 GstBuffer *buffer = frame->buffer;
1434 overhead = frame->overhead;
1438 data_len = gst_buffer_get_size (buffer) - overhead;
1439 parse->priv->data_bytecount += data_len;
1441 /* duration should be valid by now,
1442 * either set by subclass or maybe based on fps settings */
1443 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1444 /* Calculate duration of a frame from buffer properties */
1445 frame_dur = GST_BUFFER_DURATION (buffer);
1446 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1447 parse->priv->acc_duration;
1450 /* No way to figure out frame duration (is this even possible?) */
1454 /* override if subclass provided bitrate, e.g. metadata based */
1455 if (parse->priv->bitrate) {
1456 parse->priv->avg_bitrate = parse->priv->bitrate;
1457 /* spread this (confirmed) info ASAP */
1458 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1459 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1463 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1467 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1468 parse->priv->avg_bitrate);
1470 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1472 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1473 /* always post all at threshold time */
1474 update_min = update_max = update_avg = TRUE;
1477 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1478 if (frame_bitrate < parse->priv->min_bitrate) {
1479 parse->priv->min_bitrate = frame_bitrate;
1483 if (frame_bitrate > parse->priv->max_bitrate) {
1484 parse->priv->max_bitrate = frame_bitrate;
1488 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1489 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1490 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1495 if ((update_min || update_avg || update_max))
1496 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1503 * gst_base_parse_add_index_entry:
1504 * @parse: #GstBaseParse.
1505 * @offset: offset of entry
1506 * @ts: timestamp associated with offset
1507 * @key: whether entry refers to keyframe
1508 * @force: add entry disregarding sanity checks
1510 * Adds an entry to the index associating @offset to @ts. It is recommended
1511 * to only add keyframe entries. @force allows to bypass checks, such as
1512 * whether the stream is (upstream) seekable, another entry is already "close"
1513 * to the new entry, etc.
1515 * Returns: #gboolean indicating whether entry was added
1520 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1521 GstClockTime ts, gboolean key, gboolean force)
1523 gboolean ret = FALSE;
1524 GstIndexAssociation associations[2];
1526 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1527 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1529 if (G_LIKELY (!force)) {
1531 if (!parse->priv->upstream_seekable) {
1532 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1536 /* FIXME need better helper data structure that handles these issues
1537 * related to ongoing collecting of index entries */
1538 if (parse->priv->index_last_offset >= (gint64) offset) {
1539 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1540 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1544 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1545 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1546 parse->priv->idx_interval) {
1547 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1548 GST_TIME_ARGS (parse->priv->index_last_ts));
1552 /* if last is not really the last one */
1553 if (!parse->priv->index_last_valid) {
1554 GstClockTime prev_ts;
1556 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1557 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1558 GST_DEBUG_OBJECT (parse,
1559 "entry too close to existing entry %" GST_TIME_FORMAT,
1560 GST_TIME_ARGS (prev_ts));
1561 parse->priv->index_last_offset = offset;
1562 parse->priv->index_last_ts = ts;
1568 associations[0].format = GST_FORMAT_TIME;
1569 associations[0].value = ts;
1570 associations[1].format = GST_FORMAT_BYTES;
1571 associations[1].value = offset;
1573 /* index might change on-the-fly, although that would be nutty app ... */
1574 GST_BASE_PARSE_INDEX_LOCK (parse);
1575 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1576 (key) ? GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT :
1577 GST_INDEX_ASSOCIATION_FLAG_DELTA_UNIT, 2,
1578 (const GstIndexAssociation *) &associations);
1579 GST_BASE_PARSE_INDEX_UNLOCK (parse);
1582 parse->priv->index_last_offset = offset;
1583 parse->priv->index_last_ts = ts;
1592 /* check for seekable upstream, above and beyond a mere query */
1594 gst_base_parse_check_seekability (GstBaseParse * parse)
1597 gboolean seekable = FALSE;
1598 gint64 start = -1, stop = -1;
1599 guint idx_interval = 0;
1601 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1602 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1603 GST_DEBUG_OBJECT (parse, "seeking query failed");
1607 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1609 /* try harder to query upstream size if we didn't get it the first time */
1610 if (seekable && stop == -1) {
1611 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1612 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1615 /* if upstream doesn't know the size, it's likely that it's not seekable in
1616 * practice even if it technically may be seekable */
1617 if (seekable && (start != 0 || stop <= start)) {
1618 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1622 /* let's not put every single frame into our index */
1624 if (stop < 10 * 1024 * 1024)
1626 else if (stop < 100 * 1024 * 1024)
1629 idx_interval = 1000;
1633 gst_query_unref (query);
1635 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1636 G_GUINT64_FORMAT ")", seekable, start, stop);
1637 parse->priv->upstream_seekable = seekable;
1638 parse->priv->upstream_size = seekable ? stop : 0;
1640 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1641 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1644 /* some misc checks on upstream */
1646 gst_base_parse_check_upstream (GstBaseParse * parse)
1650 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
1651 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1652 /* upstream has one, accept it also, and no further updates */
1653 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1654 parse->priv->upstream_has_duration = TRUE;
1657 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1658 parse->priv->upstream_has_duration);
1661 /* checks src caps to determine if dealing with audio or video */
1662 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1664 gst_base_parse_check_media (GstBaseParse * parse)
1669 caps = gst_pad_get_current_caps (parse->srcpad);
1670 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1671 parse->priv->is_video =
1672 g_str_has_prefix (gst_structure_get_name (s), "video");
1674 /* historical default */
1675 parse->priv->is_video = FALSE;
1678 gst_caps_unref (caps);
1680 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1683 /* takes ownership of frame */
1685 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1687 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1688 /* frame allocated on the heap, we can just take ownership */
1689 g_queue_push_tail (&parse->priv->queued_frames, frame);
1690 GST_TRACE ("queued frame %p", frame);
1692 GstBaseParseFrame *copy;
1694 /* probably allocated on the stack, must make a proper copy */
1695 copy = gst_base_parse_frame_copy (frame);
1696 g_queue_push_tail (&parse->priv->queued_frames, copy);
1697 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1698 gst_base_parse_frame_free (frame);
1702 /* makes sure that @buf is properly prepared and decorated for passing
1703 * to baseclass, and an equally setup frame is returned setup with @buf.
1704 * Takes ownership of @buf. */
1705 static GstBaseParseFrame *
1706 gst_base_parse_prepare_frame (GstBaseParse * parse, GstBuffer * buffer)
1708 GstBaseParseFrame *frame = NULL;
1710 buffer = gst_buffer_make_writable (buffer);
1712 GST_LOG_OBJECT (parse,
1713 "preparing frame at offset %" G_GUINT64_FORMAT
1714 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
1715 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1716 gst_buffer_get_size (buffer));
1718 if (parse->priv->discont) {
1719 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1720 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1721 parse->priv->discont = FALSE;
1724 GST_BUFFER_OFFSET (buffer) = parse->priv->offset;
1726 if (parse->priv->prev_frame) {
1727 if (parse->priv->prev_offset == parse->priv->offset) {
1728 frame = parse->priv->prev_frame;
1730 gst_base_parse_frame_free (parse->priv->prev_frame);
1732 parse->priv->prev_frame = NULL;
1736 frame = gst_base_parse_frame_new (buffer, 0, 0);
1739 /* also ensure to update state flags */
1740 gst_base_parse_frame_update (parse, frame, buffer);
1741 gst_buffer_unref (buffer);
1743 frame->offset = parse->priv->prev_offset = parse->priv->offset;
1745 /* use default handler to provide initial (upstream) metadata */
1746 gst_base_parse_parse_frame (parse, frame);
1752 gst_base_parse_unprepare_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1754 g_assert (parse->priv->prev_frame == NULL);
1756 parse->priv->prev_frame = frame;
1757 gst_base_parse_frame_update (parse, frame, NULL);
1760 /* Wraps buffer in a frame and dispatches to subclass.
1761 * Also manages data skipping and offset handling (including adapter flushing).
1762 * Takes ownership of @buffer */
1763 static GstFlowReturn
1764 gst_base_parse_handle_buffer (GstBaseParse * parse, GstBuffer * buffer,
1765 gint * skip, gint * flushed)
1767 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1768 GstBaseParseFrame *frame;
1771 g_return_val_if_fail (skip != NULL || flushed != NULL, GST_FLOW_ERROR);
1773 GST_LOG_OBJECT (parse,
1774 "handling buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT
1775 ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer),
1776 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1777 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1779 /* track what is being flushed during this single round of frame processing */
1780 parse->priv->flushed = 0;
1783 /* make it easy for _finish_frame to pick up input data */
1784 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1785 gst_buffer_ref (buffer);
1786 gst_adapter_push (parse->priv->adapter, buffer);
1789 frame = gst_base_parse_prepare_frame (parse, buffer);
1790 ret = klass->handle_frame (parse, frame, skip);
1791 gst_base_parse_unprepare_frame (parse, frame);
1793 *flushed = parse->priv->flushed;
1795 GST_LOG_OBJECT (parse, "handle_frame skipped %d, flushed %d",
1798 if (ret != GST_FLOW_OK) {
1799 GST_DEBUG_OBJECT (parse, "handle_frame returned %d", ret);
1803 /* subclass can only do one of these, or semantics are too unclear */
1804 g_assert (*skip == 0 || *flushed == 0);
1806 /* if it did something, clear frame state,
1807 * though this should also trigger the offset check anyway */
1808 if (*skip != 0 || *flushed != 0) {
1809 GST_LOG_OBJECT (parse, "clearing prev frame");
1810 gst_base_parse_frame_free (parse->priv->prev_frame);
1811 parse->priv->prev_frame = NULL;
1814 /* track skipping */
1816 GstClockTime timestamp;
1819 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", *skip);
1820 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
1821 /* reverse playback, and no frames found yet, so we are skipping
1822 * the leading part of a fragment, which may form the tail of
1823 * fragment coming later, hopefully subclass skips efficiently ... */
1824 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
1825 outbuf = gst_adapter_take_buffer (parse->priv->adapter, *skip);
1826 outbuf = gst_buffer_make_writable (outbuf);
1827 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
1828 parse->priv->buffers_head =
1829 g_slist_prepend (parse->priv->buffers_head, outbuf);
1832 gst_adapter_flush (parse->priv->adapter, *skip);
1834 if (!parse->priv->discont)
1835 parse->priv->sync_offset = parse->priv->offset;
1836 parse->priv->offset += *skip;
1837 parse->priv->discont = TRUE;
1838 /* check for indefinite skipping */
1839 if (ret == GST_FLOW_OK)
1840 ret = gst_base_parse_check_sync (parse);
1843 parse->priv->offset += *flushed;
1846 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1847 gst_adapter_clear (parse->priv->adapter);
1853 /* gst_base_parse_handle_and_push_buffer:
1854 * @parse: #GstBaseParse.
1855 * @klass: #GstBaseParseClass.
1856 * @frame: (transfer full): a #GstBaseParseFrame
1858 * Parses the frame from given buffer and pushes it forward. Also performs
1859 * timestamp handling and checks the segment limits.
1861 * This is called with srcpad STREAM_LOCK held.
1863 * Returns: #GstFlowReturn
1865 static GstFlowReturn
1866 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1867 GstBaseParseFrame * frame)
1872 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1874 /* some one-time start-up */
1875 if (G_UNLIKELY (!parse->priv->framecount)) {
1876 gst_base_parse_check_seekability (parse);
1877 gst_base_parse_check_upstream (parse);
1880 buffer = frame->buffer;
1881 offset = frame->offset;
1883 /* check if subclass/format can provide ts.
1884 * If so, that allows and enables extra seek and duration determining options */
1885 if (G_UNLIKELY (parse->priv->first_frame_offset < 0)) {
1886 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1887 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1888 parse->priv->first_frame_offset = offset;
1889 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1890 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1891 " for first frame at offset %" G_GINT64_FORMAT,
1892 GST_TIME_ARGS (parse->priv->first_frame_ts),
1893 parse->priv->first_frame_offset);
1894 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1896 GstClockTime last_ts = G_MAXINT64;
1898 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1899 gst_base_parse_locate_time (parse, &last_ts, &off);
1900 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1901 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1904 /* disable further checks */
1905 parse->priv->first_frame_offset = 0;
1909 /* again use default handler to add missing metadata;
1910 * we may have new information on frame properties */
1911 gst_base_parse_parse_frame (parse, frame);
1912 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1913 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1914 parse->priv->next_ts =
1915 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1917 /* we lost track, do not produce bogus time next time around
1918 * (probably means parser subclass has given up on parsing as well) */
1919 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1920 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1923 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1924 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1925 gst_base_parse_add_index_entry (parse, offset,
1926 GST_BUFFER_TIMESTAMP (buffer),
1927 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1929 /* All OK, push queued frames if there are any */
1930 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1931 GstBaseParseFrame *queued_frame;
1933 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1934 gst_base_parse_push_frame (parse, queued_frame);
1938 return gst_base_parse_push_frame (parse, frame);
1942 * gst_base_parse_push_frame:
1943 * @parse: #GstBaseParse.
1944 * @frame: (transfer none): a #GstBaseParseFrame
1946 * Pushes the frame's buffer downstream, sends any pending events and
1947 * does some timestamp and segment handling. Takes ownership of
1948 * frame's buffer, though caller retains ownership of @frame.
1950 * This must be called with sinkpad STREAM_LOCK held.
1952 * Returns: #GstFlowReturn
1957 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1959 GstFlowReturn ret = GST_FLOW_OK;
1960 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1961 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1962 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1966 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1967 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1969 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1971 buffer = frame->buffer;
1973 GST_LOG_OBJECT (parse,
1974 "processing buffer of size %" G_GSIZE_FORMAT " with ts %" GST_TIME_FORMAT
1975 ", duration %" GST_TIME_FORMAT, gst_buffer_get_size (buffer),
1976 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1977 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1980 parse->priv->bytecount += frame->size;
1981 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1982 parse->priv->framecount++;
1983 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1984 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1987 /* 0 means disabled */
1988 if (parse->priv->update_interval < 0)
1989 parse->priv->update_interval = 50;
1990 else if (parse->priv->update_interval > 0 &&
1991 (parse->priv->framecount % parse->priv->update_interval) == 0)
1992 gst_base_parse_update_duration (parse);
1994 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1995 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1996 if (last_start != GST_CLOCK_TIME_NONE
1997 && GST_BUFFER_DURATION_IS_VALID (buffer))
1998 last_stop = last_start + GST_BUFFER_DURATION (buffer);
2000 /* should have caps by now */
2001 if (!gst_pad_has_current_caps (parse->srcpad))
2004 /* segment adjustment magic; only if we are running the whole show */
2005 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
2006 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
2007 parse->priv->upstream_seekable)) {
2008 /* segment times are typically estimates,
2009 * actual frame data might lead subclass to different timestamps,
2010 * so override segment start from what is supplied there */
2011 if (G_UNLIKELY (parse->priv->pending_segment && !parse->priv->exact_position
2012 && GST_CLOCK_TIME_IS_VALID (last_start))) {
2013 gst_event_unref (parse->priv->pending_segment);
2014 parse->segment.start =
2015 MIN ((guint64) last_start, (guint64) parse->segment.stop);
2017 GST_DEBUG_OBJECT (parse,
2018 "adjusting pending segment start to %" GST_TIME_FORMAT,
2019 GST_TIME_ARGS (parse->segment.start));
2021 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
2023 /* handle gaps, e.g. non-zero start-time, in as much not handled by above */
2024 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
2025 GST_CLOCK_TIME_IS_VALID (last_start)) {
2026 GstClockTimeDiff diff;
2028 /* only send newsegments with increasing start times,
2029 * otherwise if these go back and forth downstream (sinks) increase
2030 * accumulated time and running_time */
2031 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
2032 if (G_UNLIKELY (diff > 2 * GST_SECOND
2033 && last_start > parse->segment.start
2034 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
2035 || last_start < parse->segment.stop))) {
2037 GST_DEBUG_OBJECT (parse,
2038 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
2039 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
2040 "Sending updated NEWSEGMENT events", diff,
2041 GST_TIME_ARGS (parse->segment.position),
2042 GST_TIME_ARGS (last_start));
2044 if (G_UNLIKELY (parse->priv->pending_segment)) {
2045 gst_event_unref (parse->priv->pending_segment);
2046 parse->segment.start = last_start;
2047 parse->segment.time = last_start;
2048 parse->priv->pending_segment =
2049 gst_event_new_segment (&parse->segment);
2051 /* skip gap FIXME */
2052 gst_pad_push_event (parse->srcpad,
2053 gst_event_new_segment (&parse->segment));
2055 parse->segment.position = last_start;
2060 if (G_UNLIKELY (parse->priv->pending_segment)) {
2061 GstEvent *pending_segment;
2063 pending_segment = parse->priv->pending_segment;
2064 parse->priv->pending_segment = NULL;
2066 GST_DEBUG_OBJECT (parse, "%s push pending segment",
2067 parse->priv->pad_mode == GST_PAD_MODE_PULL ? "loop" : "chain");
2068 gst_pad_push_event (parse->srcpad, pending_segment);
2070 /* have caps; check identity */
2071 gst_base_parse_check_media (parse);
2074 /* update bitrates and optionally post corresponding tags
2075 * (following newsegment) */
2076 gst_base_parse_update_bitrates (parse, frame);
2078 if (G_UNLIKELY (parse->priv->pending_events)) {
2081 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
2082 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
2084 g_list_free (parse->priv->pending_events);
2085 parse->priv->pending_events = NULL;
2088 if (klass->pre_push_frame) {
2089 ret = klass->pre_push_frame (parse, frame);
2091 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
2094 /* take final ownership of frame buffer */
2095 if (frame->out_buffer) {
2096 buffer = frame->out_buffer;
2097 frame->out_buffer = NULL;
2098 gst_buffer_replace (&frame->buffer, NULL);
2100 buffer = frame->buffer;
2101 frame->buffer = NULL;
2104 /* subclass must play nice */
2105 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2107 size = gst_buffer_get_size (buffer);
2109 parse->priv->seen_keyframe |= parse->priv->is_video &&
2110 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
2112 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
2113 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2114 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
2115 GST_BUFFER_TIMESTAMP (buffer) >
2116 parse->segment.stop + parse->priv->lead_out_ts) {
2117 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
2119 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2120 GST_BUFFER_DURATION_IS_VALID (buffer) &&
2121 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
2122 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
2123 parse->priv->lead_in_ts < parse->segment.start) {
2124 if (parse->priv->seen_keyframe) {
2125 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
2128 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
2129 ret = GST_BASE_PARSE_FLOW_DROPPED;
2136 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2137 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2138 gst_buffer_unref (buffer);
2140 } else if (ret == GST_FLOW_OK) {
2141 if (parse->segment.rate > 0.0) {
2142 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2144 ret = gst_pad_push (parse->srcpad, buffer);
2145 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2147 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2149 parse->priv->buffers_queued =
2150 g_slist_prepend (parse->priv->buffers_queued, buffer);
2154 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2155 size, gst_flow_get_name (ret));
2156 gst_buffer_unref (buffer);
2157 /* if we are not sufficiently in control, let upstream decide on EOS */
2158 if (ret == GST_FLOW_EOS &&
2159 (parse->priv->passthrough ||
2160 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2161 !parse->priv->upstream_seekable)))
2165 /* Update current running segment position */
2166 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
2167 parse->segment.position < last_stop)
2168 parse->segment.position = last_stop;
2175 GST_ELEMENT_ERROR (parse, STREAM, DECODE, ("No caps set"), (NULL));
2176 return GST_FLOW_ERROR;
2181 * gst_base_parse_finish_frame:
2182 * @parse: a #GstBaseParse
2183 * @frame: a #GstBaseParseFrame
2184 * @size: consumed input data represented by frame
2186 * Collects parsed data and pushes this downstream.
2187 * Source pad caps must be set when this is called.
2189 * If @frame's out_buffer is set, that will be used as subsequent frame data.
2190 * Otherwise, @size samples will be taken from the input and used for output,
2191 * and the output's metadata (timestamps etc) will be taken as (optionally)
2192 * set by the subclass on @frame's (input) buffer.
2194 * Note that the latter buffer is invalidated by this call, whereas the
2195 * caller retains ownership of @frame.
2197 * Returns: a #GstFlowReturn that should be escalated to caller (of caller)
2202 gst_base_parse_finish_frame (GstBaseParse * parse, GstBaseParseFrame * frame,
2205 GstFlowReturn ret = GST_FLOW_OK;
2207 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2208 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
2209 g_return_val_if_fail (size > 0 || frame->out_buffer, GST_FLOW_ERROR);
2210 g_return_val_if_fail (gst_adapter_available (parse->priv->adapter) >= size,
2213 GST_LOG_OBJECT (parse, "finished frame at offset %" G_GUINT64_FORMAT ", "
2214 "flushing size %d", frame->offset, size);
2216 if (parse->priv->scanning && frame->buffer) {
2217 if (!parse->priv->scanned_frame) {
2218 parse->priv->scanned_frame = gst_base_parse_frame_copy (frame);
2223 parse->priv->flushed += size;
2225 /* either PUSH or PULL mode arranges for adapter data */
2226 /* ensure output buffer */
2227 if (!frame->out_buffer) {
2228 GstBuffer *src, *dest;
2230 frame->out_buffer = gst_adapter_take_buffer (parse->priv->adapter, size);
2231 dest = frame->out_buffer;
2232 src = frame->buffer;
2233 GST_BUFFER_PTS (dest) = GST_BUFFER_PTS (src);
2234 GST_BUFFER_DTS (dest) = GST_BUFFER_DTS (src);
2235 GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src);
2236 GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src);
2237 GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src);
2238 GST_MINI_OBJECT_FLAGS (dest) = GST_MINI_OBJECT_FLAGS (src);
2240 gst_adapter_flush (parse->priv->adapter, size);
2243 /* use as input for subsequent processing */
2244 gst_buffer_replace (&frame->buffer, frame->out_buffer);
2245 gst_buffer_unref (frame->out_buffer);
2246 frame->out_buffer = NULL;
2248 /* mark input size consumed */
2251 /* subclass might queue frames/data internally if it needs more
2252 * frames to decide on the format, or might request us to queue here. */
2253 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_DROP) {
2254 gst_buffer_replace (&frame->buffer, NULL);
2256 } else if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_QUEUE) {
2257 GstBaseParseFrame *copy;
2259 copy = gst_base_parse_frame_copy (frame);
2260 copy->flags &= ~GST_BASE_PARSE_FRAME_FLAG_QUEUE;
2261 gst_base_parse_queue_frame (parse, copy);
2265 ret = gst_base_parse_handle_and_push_frame (parse, frame);
2271 /* gst_base_parse_drain:
2273 * Drains the adapter until it is empty. It decreases the min_frame_size to
2274 * match the current adapter size and calls chain method until the adapter
2275 * is emptied or chain returns with error.
2278 gst_base_parse_drain (GstBaseParse * parse)
2282 GST_DEBUG_OBJECT (parse, "draining");
2283 parse->priv->drain = TRUE;
2286 avail = gst_adapter_available (parse->priv->adapter);
2290 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2291 NULL) != GST_FLOW_OK) {
2295 /* nothing changed, maybe due to truncated frame; break infinite loop */
2296 if (avail == gst_adapter_available (parse->priv->adapter)) {
2297 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2298 gst_adapter_clear (parse->priv->adapter);
2302 parse->priv->drain = FALSE;
2305 /* gst_base_parse_send_buffers
2307 * Sends buffers collected in send_buffers downstream, and ensures that list
2308 * is empty at the end (errors or not).
2310 static GstFlowReturn
2311 gst_base_parse_send_buffers (GstBaseParse * parse)
2313 GSList *send = NULL;
2315 GstFlowReturn ret = GST_FLOW_OK;
2317 send = parse->priv->buffers_send;
2321 buf = GST_BUFFER_CAST (send->data);
2322 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
2323 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2324 ", offset %" G_GINT64_FORMAT, buf,
2325 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
2326 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2328 /* iterate output queue an push downstream */
2329 ret = gst_pad_push (parse->srcpad, buf);
2330 send = g_slist_delete_link (send, send);
2332 /* clear any leftover if error */
2333 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2335 buf = GST_BUFFER_CAST (send->data);
2336 gst_buffer_unref (buf);
2337 send = g_slist_delete_link (send, send);
2342 parse->priv->buffers_send = send;
2347 /* gst_base_parse_start_fragment:
2349 * Prepares for processing a reverse playback (forward) fragment
2350 * by (re)setting proper state variables.
2352 static GstFlowReturn
2353 gst_base_parse_start_fragment (GstBaseParse * parse)
2355 GST_LOG_OBJECT (parse, "starting fragment");
2357 /* invalidate so no fall-back timestamping is performed;
2358 * ok if taken from subclass or upstream */
2359 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2360 parse->priv->prev_ts = GST_CLOCK_TIME_NONE;
2361 /* prevent it hanging around stop all the time */
2362 parse->segment.position = GST_CLOCK_TIME_NONE;
2364 parse->priv->discont = TRUE;
2366 /* head of previous fragment is now pending tail of current fragment */
2367 parse->priv->buffers_pending = parse->priv->buffers_head;
2368 parse->priv->buffers_head = NULL;
2374 /* gst_base_parse_finish_fragment:
2376 * Processes a reverse playback (forward) fragment:
2377 * - append head of last fragment that was skipped to current fragment data
2378 * - drain the resulting current fragment data (i.e. repeated chain)
2379 * - add time/duration (if needed) to frames queued by chain
2380 * - push queued data
2382 static GstFlowReturn
2383 gst_base_parse_finish_fragment (GstBaseParse * parse, gboolean prev_head)
2386 GstFlowReturn ret = GST_FLOW_OK;
2387 gboolean seen_key = FALSE, seen_delta = FALSE;
2389 GST_LOG_OBJECT (parse, "finishing fragment");
2392 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2393 while (parse->priv->buffers_pending) {
2394 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2396 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2397 gst_buffer_get_size (buf));
2398 gst_adapter_push (parse->priv->adapter, buf);
2400 GST_LOG_OBJECT (parse, "discarding head buffer");
2401 gst_buffer_unref (buf);
2403 parse->priv->buffers_pending =
2404 g_slist_delete_link (parse->priv->buffers_pending,
2405 parse->priv->buffers_pending);
2408 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2409 /* initial skipped data is added to buffers_pending */
2410 gst_base_parse_drain (parse);
2412 if (parse->priv->buffers_send) {
2413 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2414 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2417 /* add metadata (if needed to queued buffers */
2418 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2419 GST_TIME_ARGS (parse->priv->last_ts));
2420 while (parse->priv->buffers_queued) {
2421 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2423 /* no touching if upstream or parsing provided time */
2424 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2425 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2426 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2427 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2428 GST_BUFFER_DURATION_IS_VALID (buf)) {
2429 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2430 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2432 parse->priv->last_ts = 0;
2433 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2434 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2435 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2437 /* no idea, very bad */
2438 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2441 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2443 /* reverse order for ascending sending */
2444 /* send downstream at keyframe not preceded by a keyframe
2445 * (e.g. that should identify start of collection of IDR nals) */
2446 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2448 ret = gst_base_parse_send_buffers (parse);
2449 /* if a problem, throw all to sending */
2450 if (ret != GST_FLOW_OK) {
2451 parse->priv->buffers_send =
2452 g_slist_reverse (parse->priv->buffers_queued);
2453 parse->priv->buffers_queued = NULL;
2463 parse->priv->buffers_send =
2464 g_slist_prepend (parse->priv->buffers_send, buf);
2465 parse->priv->buffers_queued =
2466 g_slist_delete_link (parse->priv->buffers_queued,
2467 parse->priv->buffers_queued);
2470 /* audio may have all marked as keyframe, so arrange to send here */
2472 ret = gst_base_parse_send_buffers (parse);
2474 /* any trailing unused no longer usable (ideally none) */
2475 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2476 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2477 gst_adapter_available (parse->priv->adapter));
2478 gst_adapter_clear (parse->priv->adapter);
2484 /* small helper that checks whether we have been trying to resync too long */
2485 static inline GstFlowReturn
2486 gst_base_parse_check_sync (GstBaseParse * parse)
2488 if (G_UNLIKELY (parse->priv->discont &&
2489 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2490 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2491 ("Failed to parse stream"), (NULL));
2492 return GST_FLOW_ERROR;
2498 static GstFlowReturn
2499 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
2501 GstBaseParseClass *bclass;
2502 GstBaseParse *parse;
2503 GstFlowReturn ret = GST_FLOW_OK;
2504 GstBuffer *tmpbuf = NULL;
2509 GstClockTime timestamp;
2511 parse = GST_BASE_PARSE (parent);
2512 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2514 if (parse->priv->detecting) {
2515 GstBuffer *detect_buf;
2517 if (parse->priv->detect_buffers_size == 0) {
2518 detect_buf = gst_buffer_ref (buffer);
2523 detect_buf = gst_buffer_new ();
2525 for (l = parse->priv->detect_buffers; l; l = l->next) {
2526 gsize tmpsize = gst_buffer_get_size (l->data);
2528 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
2529 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
2533 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
2534 offset, gst_buffer_get_size (buffer));
2537 ret = bclass->detect (parse, detect_buf);
2538 gst_buffer_unref (detect_buf);
2540 if (ret == GST_FLOW_OK) {
2543 /* Detected something */
2544 parse->priv->detecting = FALSE;
2546 for (l = parse->priv->detect_buffers; l; l = l->next) {
2547 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2549 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2550 parent, GST_BUFFER_CAST (l->data));
2552 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2554 g_list_free (parse->priv->detect_buffers);
2555 parse->priv->detect_buffers = NULL;
2556 parse->priv->detect_buffers_size = 0;
2558 if (ret != GST_FLOW_OK) {
2562 /* Handle the current buffer */
2563 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2564 /* Still detecting, append buffer or error out if draining */
2566 if (parse->priv->drain) {
2567 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2568 return GST_FLOW_ERROR;
2569 } else if (parse->priv->flushing) {
2570 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2572 g_list_free (parse->priv->detect_buffers);
2573 parse->priv->detect_buffers = NULL;
2574 parse->priv->detect_buffers_size = 0;
2576 parse->priv->detect_buffers =
2577 g_list_append (parse->priv->detect_buffers, buffer);
2578 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
2582 /* Something went wrong, subclass responsible for error reporting */
2586 /* And now handle the current buffer if detection worked */
2589 if (G_LIKELY (buffer)) {
2590 GST_LOG_OBJECT (parse,
2591 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT,
2592 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer));
2593 if (G_UNLIKELY (parse->priv->passthrough)) {
2594 GstBaseParseFrame frame;
2596 gst_base_parse_frame_init (&frame);
2597 frame.buffer = gst_buffer_make_writable (buffer);
2598 ret = gst_base_parse_push_frame (parse, &frame);
2599 gst_base_parse_frame_free (&frame);
2602 /* upstream feeding us in reverse playback;
2603 * finish previous fragment and start new upon DISCONT */
2604 if (parse->segment.rate < 0.0) {
2605 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2606 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2607 ret = gst_base_parse_finish_fragment (parse, TRUE);
2608 gst_base_parse_start_fragment (parse);
2611 gst_adapter_push (parse->priv->adapter, buffer);
2614 /* Parse and push as many frames as possible */
2615 /* Stop either when adapter is empty or we are flushing */
2616 while (!parse->priv->flushing) {
2619 /* note: if subclass indicates MAX fsize,
2620 * this will not likely be available anyway ... */
2621 min_size = MAX (parse->priv->min_frame_size, fsize);
2622 av = gst_adapter_available (parse->priv->adapter);
2624 if (G_UNLIKELY (parse->priv->drain)) {
2626 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2627 if (G_UNLIKELY (!min_size)) {
2632 /* Collect at least min_frame_size bytes */
2633 if (av < min_size) {
2634 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)", av);
2638 /* move along with upstream timestamp (if any),
2639 * but interpolate in between */
2640 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2641 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2642 (parse->priv->prev_ts != timestamp)) {
2643 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2646 /* always pass all available data */
2647 data = gst_adapter_map (parse->priv->adapter, av);
2648 /* arrange for actual data to be copied if subclass tries to,
2649 * since what is passed is tied to the adapter */
2650 tmpbuf = gst_buffer_new ();
2651 gst_buffer_take_memory (tmpbuf, -1,
2652 gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY |
2653 GST_MEMORY_FLAG_NO_SHARE, (gpointer) data, NULL, av, 0, av));
2655 /* keep the adapter mapped, so keep track of what has to be flushed */
2656 ret = gst_base_parse_handle_buffer (parse, tmpbuf, &skip, &flush);
2659 /* probably already implicitly unmapped due to adapter operation,
2660 * but for good measure ... */
2661 gst_adapter_unmap (parse->priv->adapter);
2662 if (ret != GST_FLOW_OK) {
2665 if (skip == 0 && flush == 0) {
2666 GST_LOG_OBJECT (parse, "nothing skipped and no frames finished, "
2667 "breaking to get more data");
2673 GST_LOG_OBJECT (parse, "chain leaving");
2677 /* pull @size bytes at current offset,
2678 * i.e. at least try to and possibly return a shorter buffer if near the end */
2679 static GstFlowReturn
2680 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2681 GstBuffer ** buffer)
2683 GstFlowReturn ret = GST_FLOW_OK;
2685 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2687 /* Caching here actually makes much less difference than one would expect.
2688 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2689 if (parse->priv->cache) {
2690 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2691 gint cache_size = gst_buffer_get_size (parse->priv->cache);
2693 if (cache_offset <= parse->priv->offset &&
2694 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2695 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
2696 parse->priv->offset - cache_offset, size);
2697 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2700 /* not enough data in the cache, free cache and get a new one */
2701 gst_buffer_unref (parse->priv->cache);
2702 parse->priv->cache = NULL;
2705 /* refill the cache */
2707 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2708 64 * 1024), &parse->priv->cache);
2709 if (ret != GST_FLOW_OK) {
2710 parse->priv->cache = NULL;
2714 if (gst_buffer_get_size (parse->priv->cache) >= size) {
2716 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
2718 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2722 /* Not possible to get enough data, try a last time with
2723 * requesting exactly the size we need */
2724 gst_buffer_unref (parse->priv->cache);
2725 parse->priv->cache = NULL;
2727 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2728 &parse->priv->cache);
2730 if (ret != GST_FLOW_OK) {
2731 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2736 if (gst_buffer_get_size (parse->priv->cache) < size) {
2737 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2738 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
2739 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
2741 *buffer = parse->priv->cache;
2742 parse->priv->cache = NULL;
2748 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
2749 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2754 static GstFlowReturn
2755 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2758 GstClockTime ts = 0;
2762 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2763 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2764 parse->priv->last_offset);
2766 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2767 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2768 GST_TIME_ARGS (parse->segment.start));
2773 /* last fragment started at last_offset / last_ts;
2774 * seek back 10s capped at 1MB */
2775 if (parse->priv->last_ts >= 10 * GST_SECOND)
2776 ts = parse->priv->last_ts - 10 * GST_SECOND;
2777 /* if we are exact now, we will be more so going backwards */
2778 if (parse->priv->exact_position) {
2779 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2781 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2782 GST_FORMAT_BYTES, &offset)) {
2783 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2786 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2787 parse->priv->last_offset - 1024);
2788 offset = MAX (0, offset);
2790 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2792 parse->priv->offset = offset;
2794 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2796 if (ret != GST_FLOW_OK)
2799 /* offset will increase again as fragment is processed/parsed */
2800 parse->priv->last_offset = offset;
2802 gst_base_parse_start_fragment (parse);
2803 gst_adapter_push (parse->priv->adapter, buffer);
2804 ret = gst_base_parse_finish_fragment (parse, TRUE);
2805 if (ret != GST_FLOW_OK)
2808 /* force previous fragment */
2809 parse->priv->offset = -1;
2816 * pull and scan for next frame starting from current offset
2817 * ajusts sync, drain and offset going along */
2818 static GstFlowReturn
2819 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2823 GstFlowReturn ret = GST_FLOW_OK;
2824 guint fsize, min_size;
2828 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2829 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2831 /* let's make this efficient for all subclass once and for all;
2832 * maybe it does not need this much, but in the latter case, we know we are
2833 * in pull mode here and might as well try to read and supply more anyway
2834 * (so does the buffer caching mechanism) */
2838 min_size = MAX (parse->priv->min_frame_size, fsize);
2840 GST_LOG_OBJECT (parse, "reading buffer size %u", min_size);
2842 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2843 if (ret != GST_FLOW_OK)
2846 /* if we got a short read, inform subclass we are draining leftover
2847 * and no more is to be expected */
2848 if (gst_buffer_get_size (buffer) < min_size) {
2849 GST_LOG_OBJECT (parse, "... but did not get that; marked draining");
2850 parse->priv->drain = TRUE;
2853 if (parse->priv->detecting) {
2854 ret = klass->detect (parse, buffer);
2855 if (ret == GST_FLOW_NOT_NEGOTIATED) {
2856 /* If draining we error out, otherwise request a buffer
2858 if (parse->priv->drain) {
2859 gst_buffer_unref (buffer);
2860 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
2861 return GST_FLOW_ERROR;
2864 gst_buffer_unref (buffer);
2867 } else if (ret != GST_FLOW_OK) {
2868 gst_buffer_unref (buffer);
2869 GST_ERROR_OBJECT (parse, "detect() returned %s",
2870 gst_flow_get_name (ret));
2874 /* Else handle this buffer normally */
2877 ret = gst_base_parse_handle_buffer (parse, buffer, &skip, &flushed);
2878 if (ret != GST_FLOW_OK)
2881 /* something flushed means something happened,
2882 * and we should bail out of this loop so as not to occupy
2883 * the task thread indefinitely */
2885 GST_LOG_OBJECT (parse, "frame finished, breaking loop");
2888 /* nothing flushed, no skip and draining, so nothing left to do */
2889 if (!skip && parse->priv->drain) {
2890 GST_LOG_OBJECT (parse, "no activity or result when draining; "
2891 "breaking loop and marking EOS");
2895 /* otherwise, get some more data
2896 * note that is checked this does not happen indefinitely */
2898 GST_LOG_OBJECT (parse, "getting some more data");
2901 parse->priv->drain = FALSE;
2908 /* Loop that is used in pull mode to retrieve data from upstream */
2910 gst_base_parse_loop (GstPad * pad)
2912 GstBaseParse *parse;
2913 GstBaseParseClass *klass;
2914 GstFlowReturn ret = GST_FLOW_OK;
2916 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2917 klass = GST_BASE_PARSE_GET_CLASS (parse);
2919 /* reverse playback:
2920 * first fragment (closest to stop time) is handled normally below,
2921 * then we pull in fragments going backwards */
2922 if (parse->segment.rate < 0.0) {
2923 /* check if we jumped back to a previous fragment,
2924 * which is a post-first fragment */
2925 if (parse->priv->offset < 0) {
2926 ret = gst_base_parse_handle_previous_fragment (parse);
2931 ret = gst_base_parse_scan_frame (parse, klass, TRUE);
2932 if (ret != GST_FLOW_OK)
2935 /* eat expected eos signalling past segment in reverse playback */
2936 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
2937 parse->segment.position >= parse->segment.stop) {
2938 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2939 /* push what was accumulated during loop run */
2940 gst_base_parse_finish_fragment (parse, FALSE);
2941 /* force previous fragment */
2942 parse->priv->offset = -1;
2947 if (ret == GST_FLOW_EOS)
2949 else if (ret != GST_FLOW_OK)
2952 gst_object_unref (parse);
2959 GST_DEBUG_OBJECT (parse, "eos");
2964 gboolean push_eos = FALSE;
2966 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2967 gst_flow_get_name (ret));
2968 gst_pad_pause_task (parse->sinkpad);
2970 if (ret == GST_FLOW_EOS) {
2971 /* handle end-of-stream/segment */
2972 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2975 if ((stop = parse->segment.stop) == -1)
2976 stop = parse->segment.duration;
2978 GST_DEBUG_OBJECT (parse, "sending segment_done");
2980 gst_element_post_message
2981 (GST_ELEMENT_CAST (parse),
2982 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2983 GST_FORMAT_TIME, stop));
2985 /* If we STILL have zero frames processed, fire an error */
2986 if (parse->priv->framecount == 0) {
2987 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2988 ("No valid frames found before end of stream"), (NULL));
2992 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
2993 /* for fatal errors we post an error message, wrong-state is
2994 * not fatal because it happens due to flushes and only means
2995 * that we should stop now. */
2996 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2997 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
3001 /* newsegment before eos */
3002 if (parse->priv->pending_segment) {
3003 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
3004 parse->priv->pending_segment = NULL;
3006 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
3008 gst_object_unref (parse);
3013 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
3015 GstBaseParse *parse;
3016 gboolean result = TRUE;
3020 parse = GST_BASE_PARSE (parent);
3022 GST_DEBUG_OBJECT (parse, "sink activate");
3024 query = gst_query_new_scheduling ();
3025 result = gst_pad_peer_query (sinkpad, query);
3027 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL);
3031 gst_query_unref (query);
3034 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
3035 result = gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE);
3037 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
3038 result = gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
3041 GST_DEBUG_OBJECT (parse, "sink activate return %d", result);
3046 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
3048 GstBaseParseClass *klass;
3049 gboolean result = TRUE;
3051 GST_DEBUG_OBJECT (parse, "activate %d", active);
3053 klass = GST_BASE_PARSE_GET_CLASS (parse);
3056 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
3057 result = klass->start (parse);
3059 /* If the subclass implements ::detect we want to
3060 * call it for the first buffers now */
3061 parse->priv->detecting = (klass->detect != NULL);
3063 /* We must make sure streaming has finished before resetting things
3064 * and calling the ::stop vfunc */
3065 GST_PAD_STREAM_LOCK (parse->sinkpad);
3066 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3068 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
3069 result = klass->stop (parse);
3071 parse->priv->pad_mode = GST_PAD_MODE_NONE;
3073 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
3078 gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
3079 GstPadMode mode, gboolean active)
3081 gboolean result = TRUE;
3082 GstBaseParse *parse;
3084 parse = GST_BASE_PARSE (parent);
3086 GST_DEBUG_OBJECT (parse, "sink activate mode %d, %d", mode, active);
3088 result = gst_base_parse_activate (parse, active);
3092 case GST_PAD_MODE_PULL:
3094 parse->priv->pending_segment =
3095 gst_event_new_segment (&parse->segment);
3097 gst_pad_start_task (pad, (GstTaskFunction) gst_base_parse_loop,
3100 result &= gst_pad_stop_task (pad);
3108 parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
3110 GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
3116 * gst_base_parse_set_duration:
3117 * @parse: #GstBaseParse.
3119 * @duration: duration value.
3120 * @interval: how often to update the duration estimate based on bitrate, or 0.
3122 * Sets the duration of the currently playing media. Subclass can use this
3123 * when it is able to determine duration and/or notices a change in the media
3124 * duration. Alternatively, if @interval is non-zero (default), then stream
3125 * duration is determined based on estimated bitrate, and updated every @interval
3131 gst_base_parse_set_duration (GstBaseParse * parse,
3132 GstFormat fmt, gint64 duration, gint interval)
3134 g_return_if_fail (parse != NULL);
3136 if (parse->priv->upstream_has_duration) {
3137 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3141 if (duration != parse->priv->duration) {
3144 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
3145 gst_element_post_message (GST_ELEMENT (parse), m);
3147 /* TODO: what about duration tag? */
3149 parse->priv->duration = duration;
3150 parse->priv->duration_fmt = fmt;
3151 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3152 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3153 if (interval != 0) {
3154 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3158 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3159 parse->priv->update_interval = interval;
3165 * gst_base_parse_set_average_bitrate:
3166 * @parse: #GstBaseParse.
3167 * @bitrate: average bitrate in bits/second
3169 * Optionally sets the average bitrate detected in media (if non-zero),
3170 * e.g. based on metadata, as it will be posted to the application.
3172 * By default, announced average bitrate is estimated. The average bitrate
3173 * is used to estimate the total duration of the stream and to estimate
3174 * a seek position, if there's no index and the format is syncable
3175 * (see gst_base_parse_set_syncable()).
3180 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3182 parse->priv->bitrate = bitrate;
3183 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3187 * gst_base_parse_set_min_frame_size:
3188 * @parse: #GstBaseParse.
3189 * @min_size: Minimum size of the data that this base class should give to
3192 * Subclass can use this function to tell the base class that it needs to
3193 * give at least #min_size buffers.
3198 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3200 g_return_if_fail (parse != NULL);
3202 parse->priv->min_frame_size = min_size;
3203 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3207 * gst_base_parse_set_frame_rate:
3208 * @parse: the #GstBaseParse to set
3209 * @fps_num: frames per second (numerator).
3210 * @fps_den: frames per second (denominator).
3211 * @lead_in: frames needed before a segment for subsequent decode
3212 * @lead_out: frames needed after a segment
3214 * If frames per second is configured, parser can take care of buffer duration
3215 * and timestamping. When performing segment clipping, or seeking to a specific
3216 * location, a corresponding decoder might need an initial @lead_in and a
3217 * following @lead_out number of frames to ensure the desired segment is
3218 * entirely filled upon decoding.
3223 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3224 guint fps_den, guint lead_in, guint lead_out)
3226 g_return_if_fail (parse != NULL);
3228 parse->priv->fps_num = fps_num;
3229 parse->priv->fps_den = fps_den;
3230 if (!fps_num || !fps_den) {
3231 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3233 fps_num = fps_den = 0;
3234 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3235 parse->priv->lead_in = parse->priv->lead_out = 0;
3236 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3238 parse->priv->frame_duration =
3239 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3240 parse->priv->lead_in = lead_in;
3241 parse->priv->lead_out = lead_out;
3242 parse->priv->lead_in_ts =
3243 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3244 parse->priv->lead_out_ts =
3245 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3246 /* aim for about 1.5s to estimate duration */
3247 if (parse->priv->update_interval < 0) {
3248 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3249 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3250 parse->priv->update_interval);
3253 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3254 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3255 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3256 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3257 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3258 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3262 * gst_base_parse_set_has_timing_info:
3263 * @parse: a #GstBaseParse
3264 * @has_timing: whether frames carry timing information
3266 * Set if frames carry timing information which the subclass can (generally)
3267 * parse and provide. In particular, intrinsic (rather than estimated) time
3268 * can be obtained following a seek.
3273 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3275 parse->priv->has_timing_info = has_timing;
3276 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3280 * gst_base_parse_set_syncable:
3281 * @parse: a #GstBaseParse
3282 * @syncable: set if frame starts can be identified
3284 * Set if frame starts can be identified. This is set by default and
3285 * determines whether seeking based on bitrate averages
3286 * is possible for a format/stream.
3291 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3293 parse->priv->syncable = syncable;
3294 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3298 * gst_base_parse_set_passthrough:
3299 * @parse: a #GstBaseParse
3300 * @passthrough: %TRUE if parser should run in passthrough mode
3302 * Set if the nature of the format or configuration does not allow (much)
3303 * parsing, and the parser should operate in passthrough mode (which only
3304 * applies when operating in push mode). That is, incoming buffers are
3305 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3306 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3307 * so subclass can perform as much or as little is appropriate for
3308 * passthrough semantics in @pre_push_frame.
3313 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3315 parse->priv->passthrough = passthrough;
3316 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3320 * gst_base_parse_set_latency:
3321 * @parse: a #GstBaseParse
3322 * @min_latency: minimum parse latency
3323 * @max_latency: maximum parse latency
3325 * Sets the minimum and maximum (which may likely be equal) latency introduced
3326 * by the parsing process. If there is such a latency, which depends on the
3327 * particular parsing of the format, it typically corresponds to 1 frame duration.
3332 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3333 GstClockTime max_latency)
3335 GST_OBJECT_LOCK (parse);
3336 parse->priv->min_latency = min_latency;
3337 parse->priv->max_latency = max_latency;
3338 GST_OBJECT_UNLOCK (parse);
3339 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3340 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3341 GST_TIME_ARGS (max_latency));
3345 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3346 GstClockTime * duration)
3348 gboolean res = FALSE;
3350 g_return_val_if_fail (duration != NULL, FALSE);
3352 *duration = GST_CLOCK_TIME_NONE;
3353 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3354 GST_LOG_OBJECT (parse, "using provided duration");
3355 *duration = parse->priv->duration;
3357 } else if (parse->priv->duration != -1) {
3358 GST_LOG_OBJECT (parse, "converting provided duration");
3359 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3360 parse->priv->duration, format, (gint64 *) duration);
3361 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3362 GST_LOG_OBJECT (parse, "using estimated duration");
3363 *duration = parse->priv->estimated_duration;
3366 GST_LOG_OBJECT (parse, "cannot estimate duration");
3369 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3370 GST_TIME_ARGS (*duration));
3375 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
3377 GstBaseParse *parse;
3378 gboolean res = FALSE;
3380 parse = GST_BASE_PARSE (parent);
3382 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3384 switch (GST_QUERY_TYPE (query)) {
3385 case GST_QUERY_POSITION:
3390 GST_DEBUG_OBJECT (parse, "position query");
3391 gst_query_parse_position (query, &format, NULL);
3393 /* try upstream first */
3394 res = gst_pad_query_default (pad, parent, query);
3396 /* Fall back on interpreting segment */
3397 GST_OBJECT_LOCK (parse);
3398 if (format == GST_FORMAT_BYTES) {
3399 dest_value = parse->priv->offset;
3401 } else if (format == parse->segment.format &&
3402 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
3403 dest_value = gst_segment_to_stream_time (&parse->segment,
3404 parse->segment.format, parse->segment.position);
3407 GST_OBJECT_UNLOCK (parse);
3409 /* no precise result, upstream no idea either, then best estimate */
3410 /* priv->offset is updated in both PUSH/PULL modes */
3411 res = gst_base_parse_convert (parse,
3412 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3415 gst_query_set_position (query, format, dest_value);
3419 case GST_QUERY_DURATION:
3422 GstClockTime duration;
3424 GST_DEBUG_OBJECT (parse, "duration query");
3425 gst_query_parse_duration (query, &format, NULL);
3427 /* consult upstream */
3428 res = gst_pad_query_default (pad, parent, query);
3430 /* otherwise best estimate from us */
3432 res = gst_base_parse_get_duration (parse, format, &duration);
3434 gst_query_set_duration (query, format, duration);
3438 case GST_QUERY_SEEKING:
3441 GstClockTime duration = GST_CLOCK_TIME_NONE;
3442 gboolean seekable = FALSE;
3444 GST_DEBUG_OBJECT (parse, "seeking query");
3445 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3447 /* consult upstream */
3448 res = gst_pad_query_default (pad, parent, query);
3450 /* we may be able to help if in TIME */
3451 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3452 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3453 /* already OK if upstream takes care */
3454 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3456 if (!(res && seekable)) {
3457 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3458 || duration == -1) {
3459 /* seekable if we still have a chance to get duration later on */
3461 parse->priv->upstream_seekable && parse->priv->update_interval;
3463 seekable = parse->priv->upstream_seekable;
3464 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3467 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3473 case GST_QUERY_FORMATS:
3474 gst_query_set_formatsv (query, 3, fmtlist);
3477 case GST_QUERY_CONVERT:
3479 GstFormat src_format, dest_format;
3480 gint64 src_value, dest_value;
3482 gst_query_parse_convert (query, &src_format, &src_value,
3483 &dest_format, &dest_value);
3485 res = gst_base_parse_convert (parse, src_format, src_value,
3486 dest_format, &dest_value);
3488 gst_query_set_convert (query, src_format, src_value,
3489 dest_format, dest_value);
3493 case GST_QUERY_LATENCY:
3495 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3497 GstClockTime min_latency, max_latency;
3499 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3500 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3501 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3502 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3504 GST_OBJECT_LOCK (parse);
3505 /* add our latency */
3506 if (min_latency != -1)
3507 min_latency += parse->priv->min_latency;
3508 if (max_latency != -1)
3509 max_latency += parse->priv->max_latency;
3510 GST_OBJECT_UNLOCK (parse);
3512 gst_query_set_latency (query, live, min_latency, max_latency);
3517 res = gst_pad_query_default (pad, parent, query);
3523 /* scans for a cluster start from @pos,
3524 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3525 static GstFlowReturn
3526 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3527 GstClockTime * time, GstClockTime * duration)
3529 GstBaseParseClass *klass;
3531 gboolean orig_drain, orig_discont;
3532 GstFlowReturn ret = GST_FLOW_OK;
3533 GstBuffer *buf = NULL;
3534 GstBaseParseFrame *sframe = NULL;
3536 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3537 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3538 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3540 klass = GST_BASE_PARSE_GET_CLASS (parse);
3542 *time = GST_CLOCK_TIME_NONE;
3543 *duration = GST_CLOCK_TIME_NONE;
3546 orig_offset = parse->priv->offset;
3547 orig_discont = parse->priv->discont;
3548 orig_drain = parse->priv->drain;
3550 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3551 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3553 /* jump elsewhere and locate next frame */
3554 parse->priv->offset = *pos;
3555 /* mark as scanning so frames don't get processed all the way */
3556 parse->priv->scanning = TRUE;
3557 ret = gst_base_parse_scan_frame (parse, klass, FALSE);
3558 parse->priv->scanning = FALSE;
3559 /* retrieve frame found during scan */
3560 sframe = parse->priv->scanned_frame;
3561 parse->priv->scanned_frame = NULL;
3563 if (ret != GST_FLOW_OK || !sframe)
3566 /* get offset first, subclass parsing might dump other stuff in there */
3567 *pos = sframe->offset;
3568 buf = sframe->buffer;
3571 /* but it should provide proper time */
3572 *time = GST_BUFFER_TIMESTAMP (buf);
3573 *duration = GST_BUFFER_DURATION (buf);
3575 GST_LOG_OBJECT (parse,
3576 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3577 GST_TIME_ARGS (*time), *pos);
3581 gst_base_parse_frame_free (sframe);
3584 parse->priv->offset = orig_offset;
3585 parse->priv->discont = orig_discont;
3586 parse->priv->drain = orig_drain;
3591 /* bisect and scan through file for frame starting before @time,
3592 * returns OK and @time/@offset if found, NONE and/or error otherwise
3593 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3594 static GstFlowReturn
3595 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3598 GstFlowReturn ret = GST_FLOW_OK;
3599 gint64 lpos, hpos, newpos;
3600 GstClockTime time, ltime, htime, newtime, dur;
3601 gboolean cont = TRUE;
3602 const GstClockTime tolerance = TARGET_DIFFERENCE;
3603 const guint chunk = 4 * 1024;
3605 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3606 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3608 GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
3609 GST_TIME_ARGS (*_time));
3611 /* TODO also make keyframe aware if useful some day */
3626 /* do not know at first */
3628 *_time = GST_CLOCK_TIME_NONE;
3630 /* need initial positions; start and end */
3631 lpos = parse->priv->first_frame_offset;
3632 ltime = parse->priv->first_frame_ts;
3633 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
3634 GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
3635 return GST_FLOW_ERROR;
3637 hpos = parse->priv->upstream_size;
3639 GST_DEBUG_OBJECT (parse,
3640 "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
3641 ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, htime,
3642 GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
3644 /* check preconditions are satisfied;
3645 * start and end are needed, except for special case where we scan for
3646 * last frame to determine duration */
3647 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
3648 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3649 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3653 /* shortcut cases */
3656 } else if (time < ltime + tolerance) {
3660 } else if (time >= htime) {
3666 while (htime > ltime && cont) {
3667 GST_LOG_OBJECT (parse,
3668 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3669 GST_TIME_ARGS (ltime));
3670 GST_LOG_OBJECT (parse,
3671 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3672 GST_TIME_ARGS (htime));
3673 if (G_UNLIKELY (time == G_MAXINT64)) {
3675 } else if (G_LIKELY (hpos > lpos)) {
3677 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3680 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3682 /* we check this case once, but not forever, so break loop */
3687 newpos = CLAMP (newpos, lpos, hpos);
3688 GST_LOG_OBJECT (parse,
3689 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3690 GST_TIME_ARGS (time), newpos);
3692 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3693 if (ret == GST_FLOW_EOS) {
3694 /* heuristic HACK */
3695 hpos = MAX (lpos, hpos - chunk);
3697 } else if (ret != GST_FLOW_OK) {
3701 if (newtime == -1 || newpos == -1) {
3702 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3706 if (G_UNLIKELY (time == G_MAXINT64)) {
3709 if (GST_CLOCK_TIME_IS_VALID (dur))
3712 } else if (newtime > time) {
3714 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3716 } else if (newtime + tolerance > time) {
3717 /* close enough undershoot */
3721 } else if (newtime < ltime) {
3722 /* so a position beyond lpos resulted in earlier time than ltime ... */
3723 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3726 /* undershoot too far */
3727 newpos += newpos == lpos ? chunk : 0;
3728 lpos = CLAMP (newpos, lpos, hpos);
3734 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3735 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3740 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3741 gboolean before, GstClockTime * _ts)
3743 gint64 bytes = 0, ts = 0;
3744 GstIndexEntry *entry = NULL;
3746 if (time == GST_CLOCK_TIME_NONE) {
3752 GST_BASE_PARSE_INDEX_LOCK (parse);
3753 if (parse->priv->index) {
3754 /* Let's check if we have an index entry for that time */
3755 entry = gst_index_get_assoc_entry (parse->priv->index,
3756 parse->priv->index_id,
3757 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3758 GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3762 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3763 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3765 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3766 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3767 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3769 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3770 GST_TIME_ARGS (time));
3773 ts = GST_CLOCK_TIME_NONE;
3776 GST_BASE_PARSE_INDEX_UNLOCK (parse);
3785 /* returns TRUE if seek succeeded */
3787 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3792 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3793 gboolean flush, update, res = TRUE, accurate;
3794 gint64 cur, stop, seekpos, seekstop;
3795 GstSegment seeksegment = { 0, };
3796 GstClockTime start_ts;
3798 gst_event_parse_seek (event, &rate, &format, &flags,
3799 &cur_type, &cur, &stop_type, &stop);
3801 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3802 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3803 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3804 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3806 /* no negative rates in push mode */
3807 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
3810 if (cur_type != GST_SEEK_TYPE_SET ||
3811 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3814 /* For any format other than TIME, see if upstream handles
3815 * it directly or fail. For TIME, try upstream, but do it ourselves if
3816 * it fails upstream */
3817 res = gst_pad_push_event (parse->sinkpad, event);
3818 if (format != GST_FORMAT_TIME || res)
3821 /* get flush flag */
3822 flush = flags & GST_SEEK_FLAG_FLUSH;
3824 /* copy segment, we need this because we still need the old
3825 * segment when we close the current segment. */
3826 gst_segment_copy_into (&parse->segment, &seeksegment);
3828 GST_DEBUG_OBJECT (parse, "configuring seek");
3829 gst_segment_do_seek (&seeksegment, rate, format, flags,
3830 cur_type, cur, stop_type, stop, &update);
3832 /* accurate seeking implies seek tables are used to obtain position,
3833 * and the requested segment is maintained exactly, not adjusted any way */
3834 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3836 /* maybe we can be accurate for (almost) free */
3837 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
3838 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
3839 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3843 GstClockTime startpos = seeksegment.position;
3845 /* accurate requested, so ... seek a bit before target */
3846 if (startpos < parse->priv->lead_in_ts)
3849 startpos -= parse->priv->lead_in_ts;
3850 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3851 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3854 start_ts = seeksegment.position;
3855 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.position,
3856 GST_FORMAT_BYTES, &seekpos))
3857 goto convert_failed;
3858 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3859 GST_FORMAT_BYTES, &seekstop))
3860 goto convert_failed;
3863 GST_DEBUG_OBJECT (parse,
3864 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3866 GST_DEBUG_OBJECT (parse,
3867 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3868 seeksegment.stop, seekstop);
3870 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
3873 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3876 if (parse->srcpad) {
3877 GST_DEBUG_OBJECT (parse, "sending flush start");
3878 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3879 /* unlock upstream pull_range */
3880 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3883 gst_pad_pause_task (parse->sinkpad);
3886 /* we should now be able to grab the streaming thread because we stopped it
3887 * with the above flush/pause code */
3888 GST_PAD_STREAM_LOCK (parse->sinkpad);
3890 /* save current position */
3891 last_stop = parse->segment.position;
3892 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3895 /* now commit to new position */
3897 /* prepare for streaming again */
3899 GST_DEBUG_OBJECT (parse, "sending flush stop");
3900 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop (TRUE));
3901 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop (TRUE));
3902 gst_base_parse_clear_queues (parse);
3904 /* keep track of our position */
3905 seeksegment.base = gst_segment_to_running_time (&seeksegment,
3906 seeksegment.format, parse->segment.position);
3909 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3911 /* store the newsegment event so it can be sent from the streaming thread. */
3912 if (parse->priv->pending_segment)
3913 gst_event_unref (parse->priv->pending_segment);
3915 /* This will be sent later in _loop() */
3916 parse->priv->pending_segment = gst_event_new_segment (&parse->segment);
3918 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3919 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3920 ", pos = %" GST_TIME_FORMAT, format,
3921 GST_TIME_ARGS (parse->segment.start),
3922 GST_TIME_ARGS (parse->segment.stop),
3923 GST_TIME_ARGS (parse->segment.start));
3925 /* one last chance in pull mode to stay accurate;
3926 * maybe scan and subclass can find where to go */
3929 GstClockTime ts = seeksegment.position;
3931 gst_base_parse_locate_time (parse, &ts, &scanpos);
3935 /* running collected index now consists of several intervals,
3936 * so optimized check no longer possible */
3937 parse->priv->index_last_valid = FALSE;
3938 parse->priv->index_last_offset = 0;
3939 parse->priv->index_last_ts = 0;
3943 /* mark discont if we are going to stream from another position. */
3944 if (seekpos != parse->priv->offset) {
3945 GST_DEBUG_OBJECT (parse,
3946 "mark DISCONT, we did a seek to another position");
3947 parse->priv->offset = seekpos;
3948 parse->priv->last_offset = seekpos;
3949 parse->priv->seen_keyframe = FALSE;
3950 parse->priv->discont = TRUE;
3951 parse->priv->next_ts = start_ts;
3952 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3953 parse->priv->sync_offset = seekpos;
3954 parse->priv->exact_position = accurate;
3957 /* Start streaming thread if paused */
3958 gst_pad_start_task (parse->sinkpad,
3959 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3961 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3966 GstEvent *new_event;
3967 GstBaseParseSeek *seek;
3968 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
3970 /* The only thing we need to do in PUSH-mode is to send the
3971 seek event (in bytes) to upstream. Segment / flush handling happens
3972 in corresponding src event handlers */
3973 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3974 if (seekstop >= 0 && seekstop <= seekpos)
3976 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
3977 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3979 /* store segment info so its precise details can be reconstructed when
3980 * receiving newsegment;
3981 * this matters for all details when accurate seeking,
3982 * is most useful to preserve NONE stop time otherwise */
3983 seek = g_new0 (GstBaseParseSeek, 1);
3984 seek->segment = seeksegment;
3985 seek->accurate = accurate;
3986 seek->offset = seekpos;
3987 seek->start_ts = start_ts;
3988 GST_OBJECT_LOCK (parse);
3989 /* less optimal, but preserves order */
3990 parse->priv->pending_seeks =
3991 g_slist_append (parse->priv->pending_seeks, seek);
3992 GST_OBJECT_UNLOCK (parse);
3994 res = gst_pad_push_event (parse->sinkpad, new_event);
3997 GST_OBJECT_LOCK (parse);
3998 parse->priv->pending_seeks =
3999 g_slist_remove (parse->priv->pending_seeks, seek);
4000 GST_OBJECT_UNLOCK (parse);
4011 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
4017 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
4023 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
4029 /* Checks if bitrates are available from upstream tags so that we don't
4030 * override them later
4033 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
4035 GstTagList *taglist = NULL;
4038 gst_event_parse_tag (event, &taglist);
4040 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
4041 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
4042 parse->priv->post_min_bitrate = FALSE;
4044 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
4045 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
4046 parse->priv->post_avg_bitrate = FALSE;
4048 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
4049 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
4050 parse->priv->post_max_bitrate = FALSE;
4056 gst_base_parse_set_index (GstElement * element, GstIndex * index)
4058 GstBaseParse *parse = GST_BASE_PARSE (element);
4060 GST_BASE_PARSE_INDEX_LOCK (parse);
4061 if (parse->priv->index)
4062 gst_object_unref (parse->priv->index);
4064 parse->priv->index = gst_object_ref (index);
4065 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4066 &parse->priv->index_id);
4067 parse->priv->own_index = FALSE;
4069 parse->priv->index = NULL;
4071 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4075 gst_base_parse_get_index (GstElement * element)
4077 GstBaseParse *parse = GST_BASE_PARSE (element);
4078 GstIndex *result = NULL;
4080 GST_BASE_PARSE_INDEX_LOCK (parse);
4081 if (parse->priv->index)
4082 result = gst_object_ref (parse->priv->index);
4083 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4089 static GstStateChangeReturn
4090 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4092 GstBaseParse *parse;
4093 GstStateChangeReturn result;
4095 parse = GST_BASE_PARSE (element);
4097 switch (transition) {
4098 case GST_STATE_CHANGE_READY_TO_PAUSED:
4099 /* If this is our own index destroy it as the
4100 * old entries might be wrong for the new stream */
4101 GST_BASE_PARSE_INDEX_LOCK (parse);
4102 if (parse->priv->own_index) {
4103 gst_object_unref (parse->priv->index);
4104 parse->priv->index = NULL;
4105 parse->priv->own_index = FALSE;
4108 /* If no index was created, generate one */
4109 if (G_UNLIKELY (!parse->priv->index)) {
4110 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4112 parse->priv->index = g_object_new (gst_mem_index_get_type (), NULL);
4113 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4114 &parse->priv->index_id);
4115 parse->priv->own_index = TRUE;
4117 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4123 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4125 switch (transition) {
4126 case GST_STATE_CHANGE_PAUSED_TO_READY:
4127 gst_base_parse_reset (parse);