2 * Copyright (C) 2008 Nokia Corporation. All rights reserved.
3 * Contact: Stefan Kost <stefan.kost@nokia.com>
4 * Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
5 * Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
6 * Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
25 * SECTION:gstbaseparse
26 * @short_description: Base class for stream parsers
27 * @see_also: #GstBaseTransform
29 * This base class is for parser elements that process data and splits it
30 * into separate audio/video/whatever frames.
34 * <listitem><para>provides one sink pad and one source pad</para></listitem>
35 * <listitem><para>handles state changes</para></listitem>
36 * <listitem><para>can operate in pull mode or push mode</para></listitem>
37 * <listitem><para>handles seeking in both modes</para></listitem>
38 * <listitem><para>handles events (NEWSEGMENT/EOS/FLUSH)</para></listitem>
40 * handles queries (POSITION/DURATION/SEEKING/FORMAT/CONVERT)
42 * <listitem><para>handles flushing</para></listitem>
45 * The purpose of this base class is to provide the basic functionality of
46 * a parser and share a lot of rather complex code.
48 * Description of the parsing mechanism:
51 * <itemizedlist><title>Set-up phase</title>
53 * GstBaseParse class calls @set_sink_caps to inform the subclass about
54 * incoming sinkpad caps. Subclass should set the srcpad caps accordingly.
57 * GstBaseParse calls @start to inform subclass that data processing is
61 * At least at this point subclass needs to tell the GstBaseParse class
62 * how big data chunks it wants to receive (min_frame_size). It can do
63 * this with gst_base_parse_set_min_frame_size().
66 * GstBaseParse class sets up appropriate data passing mode (pull/push)
67 * and starts to process the data.
73 * <title>Parsing phase</title>
75 * GstBaseParse gathers at least min_frame_size bytes of data either
76 * by pulling it from upstream or collecting buffers in an internal
80 * A buffer of (at least) min_frame_size bytes is passed to subclass with
81 * @check_valid_frame. Subclass checks the contents and returns TRUE
82 * if the buffer contains a valid frame. It also needs to set the
83 * @framesize according to the detected frame size. If buffer didn't
84 * contain a valid frame, this call must return FALSE and optionally
85 * set the @skipsize value to inform base class that how many bytes
86 * it needs to skip in order to find a valid frame. @framesize can always
87 * indicate a new minimum for current frame parsing. Indicating G_MAXUINT
88 * for requested amount means subclass simply needs best available
89 * subsequent data. In push mode this amounts to an additional input buffer
90 * (thus minimal additional latency), in pull mode this amounts to some
91 * arbitrary reasonable buffer size increase. The passed buffer
92 * is read-only. Note that @check_valid_frame might receive any small
93 * amount of input data when leftover data is being drained (e.g. at EOS).
96 * After valid frame is found, it will be passed again to subclass with
97 * @parse_frame call. Now subclass is responsible for parsing the
98 * frame contents and setting the caps, and buffer metadata (e.g.
99 * buffer timestamp and duration, or keyframe if applicable).
100 * (although the latter can also be done by GstBaseParse if it is
101 * appropriately configured, see below). Frame is provided with
102 * timestamp derived from upstream (as much as generally possible),
103 * duration obtained from configuration (see below), and offset
104 * if meaningful (in pull mode).
107 * Finally the buffer can be pushed downstream and the parsing loop starts
108 * over again. Just prior to actually pushing the buffer in question,
109 * it is passed to @pre_push_frame which gives subclass yet one
110 * last chance to examine buffer metadata, or to send some custom (tag)
111 * events, or to perform custom (segment) filtering.
114 * During the parsing process GstBaseParseClass will handle both srcpad
115 * and sinkpad events. They will be passed to subclass if @event or
116 * @src_event callbacks have been provided.
121 * <itemizedlist><title>Shutdown phase</title>
123 * GstBaseParse class calls @stop to inform the subclass that data
124 * parsing will be stopped.
130 * Subclass is responsible for providing pad template caps for
131 * source and sink pads. The pads need to be named "sink" and "src". It also
132 * needs to set the fixed caps on srcpad, when the format is ensured (e.g.
133 * when base class calls subclass' @set_sink_caps function).
135 * This base class uses #GST_FORMAT_DEFAULT as a meaning of frames. So,
136 * subclass conversion routine needs to know that conversion from
137 * #GST_FORMAT_TIME to #GST_FORMAT_DEFAULT must return the
138 * frame number that can be found from the given byte position.
140 * GstBaseParse uses subclasses conversion methods also for seeking (or
141 * otherwise uses its own default one, see also below).
143 * Subclass @start and @stop functions will be called to inform the beginning
144 * and end of data processing.
146 * Things that subclass need to take care of:
148 * <listitem><para>Provide pad templates</para></listitem>
150 * Fixate the source pad caps when appropriate
153 * Inform base class how big data chunks should be retrieved. This is
154 * done with gst_base_parse_set_min_frame_size() function.
157 * Examine data chunks passed to subclass with @check_valid_frame
158 * and tell if they contain a valid frame
161 * Set the caps and timestamp to frame that is passed to subclass with
162 * @parse_frame function.
164 * <listitem><para>Provide conversion functions</para></listitem>
166 * Update the duration information with gst_base_parse_set_duration()
169 * Optionally passthrough using gst_base_parse_set_passthrough()
172 * Configure various baseparse parameters using
173 * gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
174 * and gst_base_parse_set_frame_rate().
177 * In particular, if subclass is unable to determine a duration, but
178 * parsing (or specs) yields a frames per seconds rate, then this can be
179 * provided to GstBaseParse to enable it to cater for
180 * buffer time metadata (which will be taken from upstream as much as
181 * possible). Internally keeping track of frame durations and respective
182 * sizes that have been pushed provides GstBaseParse with an estimated
183 * bitrate. A default @convert (used if not overriden) will then use these
184 * rates to perform obvious conversions. These rates are also used to
185 * update (estimated) duration at regular frame intervals.
192 * - In push mode provide a queue of adapter-"queued" buffers for upstream
194 * - Queue buffers/events until caps are set
204 /* FIXME 0.11: suppress warnings for deprecated API such as GStaticRecMutex
205 * with newer GLib versions (>= 2.31.0) */
206 #define GLIB_DISABLE_DEPRECATION_WARNINGS
207 #include <gst/base/gstadapter.h>
209 #include "gstbaseparse.h"
211 #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
213 #define MIN_FRAMES_TO_POST_BITRATE 10
214 #define TARGET_DIFFERENCE (20 * GST_SECOND)
216 GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
217 #define GST_CAT_DEFAULT gst_base_parse_debug
219 /* Supported formats */
220 static const GstFormat fmtlist[] = {
227 #define GST_BASE_PARSE_GET_PRIVATE(obj) \
228 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
230 struct _GstBaseParsePrivate
232 GstActivateMode pad_mode;
237 GstFormat duration_fmt;
238 gint64 estimated_duration;
239 gint64 estimated_drift;
241 guint min_frame_size;
242 gboolean passthrough;
244 gboolean has_timing_info;
245 guint fps_num, fps_den;
246 gint update_interval;
248 guint lead_in, lead_out;
249 GstClockTime lead_in_ts, lead_out_ts;
250 GstClockTime min_latency, max_latency;
258 GstClockTime next_ts;
259 GstClockTime prev_ts;
260 GstClockTime frame_duration;
261 gboolean seen_keyframe;
266 guint64 data_bytecount;
267 guint64 acc_duration;
268 GstClockTime first_frame_ts;
269 gint64 first_frame_offset;
271 gboolean post_min_bitrate;
272 gboolean post_avg_bitrate;
273 gboolean post_max_bitrate;
277 guint posted_avg_bitrate;
279 GList *pending_events;
281 /* frames/buffers that are queued and ready to go on OK */
282 GQueue queued_frames;
286 /* index entry storage, either ours or provided */
290 #if !GLIB_CHECK_VERSION (2, 31, 0)
291 GStaticMutex index_lock;
296 /* seek table entries only maintained if upstream is BYTE seekable */
297 gboolean upstream_seekable;
298 gboolean upstream_has_duration;
299 gint64 upstream_size;
300 /* minimum distance between two index entries */
301 GstClockTimeDiff idx_interval;
302 /* ts and offset of last entry added */
303 GstClockTime index_last_ts;
304 gint64 index_last_offset;
305 gboolean index_last_valid;
307 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
308 gboolean exact_position;
309 /* seek events are temporarily kept to match them with newsegments */
310 GSList *pending_seeks;
312 /* reverse playback */
313 GSList *buffers_pending;
314 GSList *buffers_queued;
315 GSList *buffers_send;
316 GstClockTime last_ts;
319 /* Newsegment event to be sent after SEEK */
320 GstEvent *pending_segment;
322 /* Segment event that closes the running segment prior to SEEK */
323 GstEvent *close_segment;
325 /* push mode helper frame */
326 GstBaseParseFrame frame;
328 /* TRUE if we're still detecting the format, i.e.
329 * if ::detect() is still called for future buffers */
331 GList *detect_buffers;
332 guint detect_buffers_size;
335 typedef struct _GstBaseParseSeek
340 GstClockTime start_ts;
343 #if !GLIB_CHECK_VERSION (2, 31, 0)
344 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
345 g_static_mutex_lock (&parse->priv->index_lock);
346 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
347 g_static_mutex_unlock (&parse->priv->index_lock);
349 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
350 g_mutex_lock (&parse->priv->index_lock);
351 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
352 g_mutex_unlock (&parse->priv->index_lock);
355 static GstElementClass *parent_class = NULL;
357 static void gst_base_parse_class_init (GstBaseParseClass * klass);
358 static void gst_base_parse_init (GstBaseParse * parse,
359 GstBaseParseClass * klass);
362 gst_base_parse_get_type (void)
364 static volatile gsize base_parse_type = 0;
366 if (g_once_init_enter (&base_parse_type)) {
367 static const GTypeInfo base_parse_info = {
368 sizeof (GstBaseParseClass),
369 (GBaseInitFunc) NULL,
370 (GBaseFinalizeFunc) NULL,
371 (GClassInitFunc) gst_base_parse_class_init,
374 sizeof (GstBaseParse),
376 (GInstanceInitFunc) gst_base_parse_init,
380 _type = g_type_register_static (GST_TYPE_ELEMENT,
381 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
382 g_once_init_leave (&base_parse_type, _type);
384 return (GType) base_parse_type;
387 static void gst_base_parse_finalize (GObject * object);
389 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
390 GstStateChange transition);
391 static void gst_base_parse_reset (GstBaseParse * parse);
393 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
394 static GstIndex *gst_base_parse_get_index (GstElement * element);
396 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad);
397 static gboolean gst_base_parse_sink_activate_push (GstPad * pad,
399 static gboolean gst_base_parse_sink_activate_pull (GstPad * pad,
401 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
403 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
405 static gboolean gst_base_parse_src_event (GstPad * pad, GstEvent * event);
406 static gboolean gst_base_parse_sink_event (GstPad * pad, GstEvent * event);
407 static gboolean gst_base_parse_query (GstPad * pad, GstQuery * query);
408 static gboolean gst_base_parse_sink_setcaps (GstPad * pad, GstCaps * caps);
409 static GstCaps *gst_base_parse_sink_getcaps (GstPad * pad);
410 static const GstQueryType *gst_base_parse_get_querytypes (GstPad * pad);
412 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstBuffer * buffer);
413 static void gst_base_parse_loop (GstPad * pad);
415 static gboolean gst_base_parse_check_frame (GstBaseParse * parse,
416 GstBaseParseFrame * frame, guint * framesize, gint * skipsize);
417 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
418 GstBaseParseFrame * frame);
420 static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse,
423 static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse,
426 static void gst_base_parse_drain (GstBaseParse * parse);
428 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
429 gboolean post_min, gboolean post_avg, gboolean post_max);
431 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
432 GstClockTime time, gboolean before, GstClockTime * _ts);
433 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
434 GstClockTime * _time, gint64 * _offset);
436 static GstFlowReturn gst_base_parse_process_fragment (GstBaseParse * parse,
439 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
442 gst_base_parse_clear_queues (GstBaseParse * parse)
444 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
445 g_slist_free (parse->priv->buffers_queued);
446 parse->priv->buffers_queued = NULL;
447 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
449 g_slist_free (parse->priv->buffers_pending);
450 parse->priv->buffers_pending = NULL;
451 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
452 g_slist_free (parse->priv->buffers_send);
453 parse->priv->buffers_send = NULL;
455 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
456 g_list_free (parse->priv->detect_buffers);
457 parse->priv->detect_buffers = NULL;
458 parse->priv->detect_buffers_size = 0;
460 g_queue_foreach (&parse->priv->queued_frames,
461 (GFunc) gst_base_parse_frame_free, NULL);
462 g_queue_clear (&parse->priv->queued_frames);
464 gst_buffer_replace (&parse->priv->cache, NULL);
466 g_list_foreach (parse->priv->pending_events, (GFunc) gst_event_unref, NULL);
467 g_list_free (parse->priv->pending_events);
468 parse->priv->pending_events = NULL;
470 gst_event_replace (&parse->priv->pending_segment, NULL);
471 gst_event_replace (&parse->priv->close_segment, NULL);
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);
486 if (parse->priv->close_segment) {
487 p_ev = &parse->priv->close_segment;
488 gst_event_replace (p_ev, NULL);
491 if (parse->priv->cache) {
492 gst_buffer_unref (parse->priv->cache);
493 parse->priv->cache = NULL;
496 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
498 g_list_free (parse->priv->pending_events);
499 parse->priv->pending_events = NULL;
501 if (parse->priv->index) {
502 gst_object_unref (parse->priv->index);
503 parse->priv->index = NULL;
505 #if !GLIB_CHECK_VERSION (2, 31, 0)
506 g_static_mutex_free (&parse->priv->index_lock);
508 g_mutex_clear (&parse->priv->index_lock);
511 gst_base_parse_clear_queues (parse);
513 G_OBJECT_CLASS (parent_class)->finalize (object);
517 gst_base_parse_class_init (GstBaseParseClass * klass)
519 GObjectClass *gobject_class;
520 GstElementClass *gstelement_class;
522 gobject_class = G_OBJECT_CLASS (klass);
523 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
524 parent_class = g_type_class_peek_parent (klass);
525 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
527 gstelement_class = (GstElementClass *) klass;
528 gstelement_class->change_state =
529 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
530 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
531 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
533 /* Default handlers */
534 klass->check_valid_frame = gst_base_parse_check_frame;
535 klass->parse_frame = gst_base_parse_parse_frame;
536 klass->src_event = gst_base_parse_src_eventfunc;
537 klass->convert = gst_base_parse_convert_default;
539 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
540 "baseparse element");
544 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
546 GstPadTemplate *pad_template;
548 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
550 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
553 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
554 g_return_if_fail (pad_template != NULL);
555 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
556 gst_pad_set_event_function (parse->sinkpad,
557 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
558 gst_pad_set_setcaps_function (parse->sinkpad,
559 GST_DEBUG_FUNCPTR (gst_base_parse_sink_setcaps));
560 gst_pad_set_getcaps_function (parse->sinkpad,
561 GST_DEBUG_FUNCPTR (gst_base_parse_sink_getcaps));
562 gst_pad_set_chain_function (parse->sinkpad,
563 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
564 gst_pad_set_activate_function (parse->sinkpad,
565 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
566 gst_pad_set_activatepush_function (parse->sinkpad,
567 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_push));
568 gst_pad_set_activatepull_function (parse->sinkpad,
569 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_pull));
570 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
572 GST_DEBUG_OBJECT (parse, "sinkpad created");
575 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
576 g_return_if_fail (pad_template != NULL);
577 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
578 gst_pad_set_event_function (parse->srcpad,
579 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
580 gst_pad_set_query_type_function (parse->srcpad,
581 GST_DEBUG_FUNCPTR (gst_base_parse_get_querytypes));
582 gst_pad_set_query_function (parse->srcpad,
583 GST_DEBUG_FUNCPTR (gst_base_parse_query));
584 gst_pad_use_fixed_caps (parse->srcpad);
585 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
586 GST_DEBUG_OBJECT (parse, "src created");
588 g_queue_init (&parse->priv->queued_frames);
590 parse->priv->adapter = gst_adapter_new ();
592 parse->priv->pad_mode = GST_ACTIVATE_NONE;
594 #if !GLIB_CHECK_VERSION (2, 31, 0)
595 g_static_mutex_init (&parse->priv->index_lock);
597 g_mutex_init (&parse->priv->index_lock);
601 gst_base_parse_reset (parse);
602 GST_DEBUG_OBJECT (parse, "init ok");
605 static GstBaseParseFrame *
606 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
608 GstBaseParseFrame *copy;
610 copy = g_slice_dup (GstBaseParseFrame, frame);
611 copy->buffer = gst_buffer_ref (frame->buffer);
612 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
614 GST_TRACE ("copied frame %p -> %p", frame, copy);
620 gst_base_parse_frame_free (GstBaseParseFrame * frame)
622 GST_TRACE ("freeing frame %p", frame);
625 gst_buffer_unref (frame->buffer);
626 frame->buffer = NULL;
629 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
630 g_slice_free (GstBaseParseFrame, frame);
632 memset (frame, 0, sizeof (*frame));
637 gst_base_parse_frame_get_type (void)
639 static volatile gsize frame_type = 0;
641 if (g_once_init_enter (&frame_type)) {
644 _type = g_boxed_type_register_static ("GstBaseParseFrame",
645 (GBoxedCopyFunc) gst_base_parse_frame_copy,
646 (GBoxedFreeFunc) gst_base_parse_frame_free);
647 g_once_init_leave (&frame_type, _type);
649 return (GType) frame_type;
653 * gst_base_parse_frame_init:
654 * @frame: #GstBaseParseFrame.
656 * Sets a #GstBaseParseFrame to initial state. Currently this means
657 * all public fields are zero-ed and a private flag is set to make
658 * sure gst_base_parse_frame_free() only frees the contents but not
659 * the actual frame. Use this function to initialise a #GstBaseParseFrame
660 * allocated on the stack.
665 gst_base_parse_frame_init (GstBaseParseFrame * frame)
667 memset (frame, 0, sizeof (GstBaseParseFrame));
668 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
669 GST_TRACE ("inited frame %p", frame);
673 * gst_base_parse_frame_new:
674 * @buffer: (transfer none): a #GstBuffer
676 * @overhead: number of bytes in this frame which should be counted as
677 * metadata overhead, ie. not used to calculate the average bitrate.
678 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
680 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
681 * elements written in C should usually allocate the frame on the stack and
682 * then use gst_base_parse_frame_init() to initialise it.
684 * Returns: a newly-allocated #GstBaseParseFrame. Free with
685 * gst_base_parse_frame_free() when no longer needed, unless you gave
686 * away ownership to gst_base_parse_push_frame().
691 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
694 GstBaseParseFrame *frame;
696 frame = g_slice_new0 (GstBaseParseFrame);
697 frame->buffer = gst_buffer_ref (buffer);
699 GST_TRACE ("created frame %p", frame);
704 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
707 gst_buffer_replace (&frame->buffer, buf);
711 /* set flags one by one for clarity */
712 if (G_UNLIKELY (parse->priv->drain))
713 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
715 /* losing sync is pretty much a discont (and vice versa), no ? */
716 if (G_UNLIKELY (parse->priv->discont))
717 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
721 gst_base_parse_reset (GstBaseParse * parse)
723 GST_OBJECT_LOCK (parse);
724 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
725 parse->priv->duration = -1;
726 parse->priv->min_frame_size = 1;
727 parse->priv->discont = TRUE;
728 parse->priv->flushing = FALSE;
729 parse->priv->offset = 0;
730 parse->priv->sync_offset = 0;
731 parse->priv->update_interval = -1;
732 parse->priv->fps_num = parse->priv->fps_den = 0;
733 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
734 parse->priv->lead_in = parse->priv->lead_out = 0;
735 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
736 parse->priv->bitrate = 0;
737 parse->priv->framecount = 0;
738 parse->priv->bytecount = 0;
739 parse->priv->acc_duration = 0;
740 parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE;
741 parse->priv->first_frame_offset = -1;
742 parse->priv->estimated_duration = -1;
743 parse->priv->estimated_drift = 0;
744 parse->priv->next_ts = 0;
745 parse->priv->syncable = TRUE;
746 parse->priv->passthrough = FALSE;
747 parse->priv->has_timing_info = FALSE;
748 parse->priv->post_min_bitrate = TRUE;
749 parse->priv->post_avg_bitrate = TRUE;
750 parse->priv->post_max_bitrate = TRUE;
751 parse->priv->min_bitrate = G_MAXUINT;
752 parse->priv->max_bitrate = 0;
753 parse->priv->avg_bitrate = 0;
754 parse->priv->posted_avg_bitrate = 0;
756 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
757 parse->priv->index_last_offset = -1;
758 parse->priv->index_last_valid = TRUE;
759 parse->priv->upstream_seekable = FALSE;
760 parse->priv->upstream_size = 0;
761 parse->priv->upstream_has_duration = FALSE;
762 parse->priv->idx_interval = 0;
763 parse->priv->exact_position = TRUE;
764 parse->priv->seen_keyframe = FALSE;
766 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
767 parse->priv->last_offset = 0;
769 if (parse->priv->pending_segment) {
770 gst_event_unref (parse->priv->pending_segment);
771 parse->priv->pending_segment = NULL;
774 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
776 g_list_free (parse->priv->pending_events);
777 parse->priv->pending_events = NULL;
779 gst_event_replace (&parse->priv->close_segment, NULL);
781 if (parse->priv->cache) {
782 gst_buffer_unref (parse->priv->cache);
783 parse->priv->cache = NULL;
786 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
787 g_slist_free (parse->priv->pending_seeks);
788 parse->priv->pending_seeks = NULL;
790 if (parse->priv->adapter)
791 gst_adapter_clear (parse->priv->adapter);
793 /* we know it is not alloc'ed, but maybe other stuff to free, some day ... */
794 parse->priv->frame._private_flags |=
795 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
796 gst_base_parse_frame_free (&parse->priv->frame);
798 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
799 g_list_free (parse->priv->detect_buffers);
800 parse->priv->detect_buffers = NULL;
801 parse->priv->detect_buffers_size = 0;
802 GST_OBJECT_UNLOCK (parse);
805 /* gst_base_parse_check_frame:
806 * @parse: #GstBaseParse.
807 * @buffer: GstBuffer.
808 * @framesize: This will be set to tell the found frame size in bytes.
809 * @skipsize: Output parameter that tells how much data needs to be skipped
810 * in order to find the following frame header.
812 * Default callback for check_valid_frame.
814 * Returns: Always TRUE.
817 gst_base_parse_check_frame (GstBaseParse * parse,
818 GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
820 *framesize = GST_BUFFER_SIZE (frame->buffer);
826 /* gst_base_parse_parse_frame:
827 * @parse: #GstBaseParse.
828 * @buffer: #GstBuffer.
830 * Default callback for parse_frame.
833 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
835 GstBuffer *buffer = frame->buffer;
837 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
838 GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) {
839 GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts;
841 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
842 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
843 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
848 /* gst_base_parse_convert:
849 * @parse: #GstBaseParse.
850 * @src_format: #GstFormat describing the source format.
851 * @src_value: Source value to be converted.
852 * @dest_format: #GstFormat defining the converted format.
853 * @dest_value: Pointer where the conversion result will be put.
855 * Converts using configured "convert" vmethod in #GstBaseParse class.
857 * Returns: TRUE if conversion was successful.
860 gst_base_parse_convert (GstBaseParse * parse,
861 GstFormat src_format,
862 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
864 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
867 g_return_val_if_fail (dest_value != NULL, FALSE);
872 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
874 #ifndef GST_DISABLE_GST_DEBUG
877 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
878 GST_LOG_OBJECT (parse,
879 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
880 GST_TIME_ARGS (src_value), *dest_value);
881 } else if (dest_format == GST_FORMAT_TIME &&
882 src_format == GST_FORMAT_BYTES) {
883 GST_LOG_OBJECT (parse,
884 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
885 src_value, GST_TIME_ARGS (*dest_value));
887 GST_LOG_OBJECT (parse,
888 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
889 GST_STR_NULL (gst_format_get_name (src_format)),
890 GST_STR_NULL (gst_format_get_name (dest_format)),
891 src_value, *dest_value);
894 GST_DEBUG_OBJECT (parse, "conversion failed");
902 /* gst_base_parse_sink_event:
903 * @pad: #GstPad that received the event.
904 * @event: #GstEvent to be handled.
906 * Handler for sink pad events.
908 * Returns: TRUE if the event was handled.
911 gst_base_parse_sink_event (GstPad * pad, GstEvent * event)
914 GstBaseParseClass *bclass;
915 gboolean handled = FALSE;
918 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
919 bclass = GST_BASE_PARSE_GET_CLASS (parse);
921 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
922 GST_EVENT_TYPE_NAME (event));
924 /* Cache all serialized events except EOS, NEWSEGMENT and FLUSH_STOP if we have a
926 if (parse->priv->pending_segment && GST_EVENT_IS_SERIALIZED (event)
927 && GST_EVENT_TYPE (event) != GST_EVENT_EOS
928 && GST_EVENT_TYPE (event) != GST_EVENT_NEWSEGMENT
929 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
930 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP) {
932 if (GST_EVENT_TYPE (event) == GST_EVENT_TAG)
933 /* See if any bitrate tags were posted */
934 gst_base_parse_handle_tag (parse, event);
936 parse->priv->pending_events =
937 g_list_append (parse->priv->pending_events, event);
941 if (GST_EVENT_TYPE (event) == GST_EVENT_EOS &&
942 parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
943 /* We've not posted bitrate tags yet - do so now */
944 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
947 handled = bclass->event (parse, event);
950 handled = gst_base_parse_sink_eventfunc (parse, event);
953 ret = gst_pad_event_default (pad, event);
956 gst_object_unref (parse);
957 GST_DEBUG_OBJECT (parse, "event handled");
962 /* gst_base_parse_sink_eventfunc:
963 * @parse: #GstBaseParse.
964 * @event: #GstEvent to be handled.
966 * Element-level event handler function.
968 * The event will be unreffed only if it has been handled and this
969 * function returns %TRUE
971 * Returns: %TRUE if the event was handled and not need forwarding.
974 gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event)
976 gboolean handled = FALSE;
979 switch (GST_EVENT_TYPE (event)) {
980 case GST_EVENT_NEWSEGMENT:
982 gdouble rate, applied_rate;
984 gint64 start, stop, pos, next_ts, offset = 0;
987 gst_event_parse_new_segment_full (event, &update, &rate, &applied_rate,
988 &format, &start, &stop, &pos);
990 GST_DEBUG_OBJECT (parse, "newseg rate %g, applied rate %g, "
991 "format %d, start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
992 ", pos = %" GST_TIME_FORMAT, rate, applied_rate, format,
993 GST_TIME_ARGS (start), GST_TIME_ARGS (stop), GST_TIME_ARGS (pos));
995 if (format == GST_FORMAT_BYTES) {
996 GstClockTime seg_start, seg_stop;
997 GstBaseParseSeek *seek = NULL;
1000 /* stop time is allowed to be open-ended, but not start & pos */
1001 seg_stop = GST_CLOCK_TIME_NONE;
1005 GST_OBJECT_LOCK (parse);
1006 for (node = parse->priv->pending_seeks; node; node = node->next) {
1007 GstBaseParseSeek *tmp = node->data;
1009 if (tmp->offset == pos) {
1014 parse->priv->pending_seeks =
1015 g_slist_remove (parse->priv->pending_seeks, seek);
1016 GST_OBJECT_UNLOCK (parse);
1019 GST_DEBUG_OBJECT (parse,
1020 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
1021 seek->accurate ? " accurate" : "", &seek->segment);
1022 seg_start = seek->segment.start;
1023 seg_stop = seek->segment.stop;
1024 next_ts = seek->start_ts;
1025 parse->priv->exact_position = seek->accurate;
1028 /* best attempt convert */
1029 /* as these are only estimates, stop is kept open-ended to avoid
1030 * premature cutting */
1031 gst_base_parse_convert (parse, GST_FORMAT_BYTES, start,
1032 GST_FORMAT_TIME, (gint64 *) & seg_start);
1033 parse->priv->exact_position = (start == 0);
1034 next_ts = seg_start;
1037 gst_event_unref (event);
1038 event = gst_event_new_new_segment_full (update, rate, applied_rate,
1039 GST_FORMAT_TIME, seg_start, seg_stop, seg_start);
1040 format = GST_FORMAT_TIME;
1043 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. "
1044 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT,
1045 GST_TIME_ARGS (seg_start), GST_TIME_ARGS (seg_stop));
1046 } else if (format != GST_FORMAT_TIME) {
1047 /* Unknown incoming segment format. Output a default open-ended
1049 gst_event_unref (event);
1050 event = gst_event_new_new_segment_full (update, rate, applied_rate,
1051 GST_FORMAT_TIME, 0, GST_CLOCK_TIME_NONE, 0);
1052 format = GST_FORMAT_TIME;
1053 next_ts = start = 0;
1054 stop = GST_CLOCK_TIME_NONE;
1056 /* not considered BYTE seekable if it is talking to us in TIME,
1057 * whatever else it might claim */
1058 parse->priv->upstream_seekable = FALSE;
1062 gst_segment_set_newsegment_full (&parse->segment, update, rate,
1063 applied_rate, format, start, stop, start);
1065 /* save the segment for later, right before we push a new buffer so that
1066 * the caps are fixed and the next linked element can receive
1068 eventp = &parse->priv->pending_segment;
1069 gst_event_replace (eventp, event);
1070 gst_event_unref (event);
1073 /* but finish the current segment */
1074 GST_DEBUG_OBJECT (parse, "draining current segment");
1075 if (parse->segment.rate > 0.0)
1076 gst_base_parse_drain (parse);
1078 gst_base_parse_process_fragment (parse, FALSE);
1079 gst_adapter_clear (parse->priv->adapter);
1080 parse->priv->offset = offset;
1081 parse->priv->sync_offset = offset;
1082 parse->priv->next_ts = next_ts;
1083 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1084 parse->priv->discont = TRUE;
1085 parse->priv->seen_keyframe = FALSE;
1089 case GST_EVENT_FLUSH_START:
1090 parse->priv->flushing = TRUE;
1091 handled = gst_pad_push_event (parse->srcpad, gst_event_ref (event));
1093 gst_event_unref (event);
1094 /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
1095 GST_PAD_STREAM_LOCK (parse->srcpad);
1096 GST_PAD_STREAM_UNLOCK (parse->srcpad);
1100 case GST_EVENT_FLUSH_STOP:
1101 gst_adapter_clear (parse->priv->adapter);
1102 gst_base_parse_clear_queues (parse);
1103 parse->priv->flushing = FALSE;
1104 parse->priv->discont = TRUE;
1105 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1106 parse->priv->frame._private_flags |=
1107 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
1108 gst_base_parse_frame_free (&parse->priv->frame);
1112 if (parse->segment.rate > 0.0)
1113 gst_base_parse_drain (parse);
1115 gst_base_parse_process_fragment (parse, FALSE);
1117 /* If we STILL have zero frames processed, fire an error */
1118 if (parse->priv->framecount == 0) {
1119 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1120 ("No valid frames found before end of stream"), (NULL));
1122 /* newsegment before eos */
1123 if (parse->priv->pending_segment) {
1124 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
1125 parse->priv->pending_segment = NULL;
1137 /* gst_base_parse_src_event:
1138 * @pad: #GstPad that received the event.
1139 * @event: #GstEvent that was received.
1141 * Handler for source pad events.
1143 * Returns: TRUE if the event was handled.
1146 gst_base_parse_src_event (GstPad * pad, GstEvent * event)
1148 GstBaseParse *parse;
1149 GstBaseParseClass *bclass;
1150 gboolean handled = FALSE;
1151 gboolean ret = TRUE;
1153 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
1154 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1156 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1157 GST_EVENT_TYPE_NAME (event));
1159 if (bclass->src_event)
1160 handled = bclass->src_event (parse, event);
1163 ret = gst_pad_event_default (pad, event);
1165 gst_object_unref (parse);
1170 gst_base_parse_is_seekable (GstBaseParse * parse)
1172 /* FIXME: could do more here, e.g. check index or just send data from 0
1173 * in pull mode and let decoder/sink clip */
1174 return parse->priv->syncable;
1177 /* gst_base_parse_src_eventfunc:
1178 * @parse: #GstBaseParse.
1179 * @event: #GstEvent that was received.
1181 * Default srcpad event handler.
1183 * Returns: TRUE if the event was handled and can be dropped.
1186 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1188 gboolean handled = FALSE;
1190 switch (GST_EVENT_TYPE (event)) {
1191 case GST_EVENT_SEEK:
1193 if (gst_base_parse_is_seekable (parse)) {
1194 handled = gst_base_parse_handle_seek (parse, event);
1206 * gst_base_parse_convert_default:
1207 * @parse: #GstBaseParse.
1208 * @src_format: #GstFormat describing the source format.
1209 * @src_value: Source value to be converted.
1210 * @dest_format: #GstFormat defining the converted format.
1211 * @dest_value: Pointer where the conversion result will be put.
1213 * Default implementation of "convert" vmethod in #GstBaseParse class.
1215 * Returns: TRUE if conversion was successful.
1220 gst_base_parse_convert_default (GstBaseParse * parse,
1221 GstFormat src_format,
1222 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1224 gboolean ret = FALSE;
1225 guint64 bytes, duration;
1227 if (G_UNLIKELY (src_format == dest_format)) {
1228 *dest_value = src_value;
1232 if (G_UNLIKELY (src_value == -1)) {
1237 if (G_UNLIKELY (src_value == 0)) {
1242 /* need at least some frames */
1243 if (!parse->priv->framecount)
1246 duration = parse->priv->acc_duration / GST_MSECOND;
1247 bytes = parse->priv->bytecount;
1249 if (G_UNLIKELY (!duration || !bytes))
1252 if (src_format == GST_FORMAT_BYTES) {
1253 if (dest_format == GST_FORMAT_TIME) {
1254 /* BYTES -> TIME conversion */
1255 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1256 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1257 *dest_value *= GST_MSECOND;
1258 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1259 *dest_value / GST_MSECOND);
1262 } else if (src_format == GST_FORMAT_TIME) {
1263 if (dest_format == GST_FORMAT_BYTES) {
1264 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1265 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1267 GST_DEBUG_OBJECT (parse,
1268 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1269 src_value / GST_MSECOND, *dest_value);
1272 } else if (src_format == GST_FORMAT_DEFAULT) {
1273 /* DEFAULT == frame-based */
1274 if (dest_format == GST_FORMAT_TIME) {
1275 if (parse->priv->fps_den) {
1276 *dest_value = gst_util_uint64_scale (src_value,
1277 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1280 } else if (dest_format == GST_FORMAT_BYTES) {
1288 gst_base_parse_update_duration (GstBaseParse * baseparse)
1291 GstBaseParse *parse;
1293 parse = GST_BASE_PARSE (baseparse);
1295 peer = gst_pad_get_peer (parse->sinkpad);
1297 GstFormat pformat = GST_FORMAT_BYTES;
1298 gboolean qres = FALSE;
1299 gint64 ptot, dest_value;
1301 qres = gst_pad_query_duration (peer, &pformat, &ptot);
1302 gst_object_unref (GST_OBJECT (peer));
1304 if (gst_base_parse_convert (parse, pformat, ptot,
1305 GST_FORMAT_TIME, &dest_value)) {
1307 /* inform if duration changed, but try to avoid spamming */
1308 parse->priv->estimated_drift +=
1309 dest_value - parse->priv->estimated_duration;
1310 if (parse->priv->estimated_drift > GST_SECOND ||
1311 parse->priv->estimated_drift < -GST_SECOND) {
1312 gst_element_post_message (GST_ELEMENT (parse),
1313 gst_message_new_duration (GST_OBJECT (parse),
1314 GST_FORMAT_TIME, dest_value));
1315 parse->priv->estimated_drift = 0;
1317 parse->priv->estimated_duration = dest_value;
1318 GST_LOG_OBJECT (parse,
1319 "updated estimated duration to %" GST_TIME_FORMAT,
1320 GST_TIME_ARGS (dest_value));
1327 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1328 gboolean post_avg, gboolean post_max)
1330 GstTagList *taglist = NULL;
1332 if (post_min && parse->priv->post_min_bitrate) {
1333 taglist = gst_tag_list_new ();
1335 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1336 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1339 if (post_avg && parse->priv->post_avg_bitrate) {
1340 if (taglist == NULL)
1341 taglist = gst_tag_list_new ();
1343 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1344 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1345 parse->priv->avg_bitrate, NULL);
1348 if (post_max && parse->priv->post_max_bitrate) {
1349 if (taglist == NULL)
1350 taglist = gst_tag_list_new ();
1352 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1353 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1356 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1357 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1358 parse->priv->max_bitrate);
1360 if (taglist != NULL) {
1361 gst_element_found_tags_for_pad (GST_ELEMENT_CAST (parse), parse->srcpad,
1366 /* gst_base_parse_update_bitrates:
1367 * @parse: #GstBaseParse.
1368 * @buffer: Current frame as a #GstBuffer
1370 * Keeps track of the minimum and maximum bitrates, and also maintains a
1371 * running average bitrate of the stream so far.
1374 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1376 /* Only update the tag on a 10 kbps delta */
1377 static const gint update_threshold = 10000;
1379 guint64 data_len, frame_dur;
1380 gint overhead, frame_bitrate, old_avg_bitrate;
1381 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1382 GstBuffer *buffer = frame->buffer;
1384 overhead = frame->overhead;
1388 data_len = GST_BUFFER_SIZE (buffer) - overhead;
1389 parse->priv->data_bytecount += data_len;
1391 /* duration should be valid by now,
1392 * either set by subclass or maybe based on fps settings */
1393 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1394 /* Calculate duration of a frame from buffer properties */
1395 frame_dur = GST_BUFFER_DURATION (buffer);
1396 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1397 parse->priv->acc_duration;
1400 /* No way to figure out frame duration (is this even possible?) */
1404 /* override if subclass provided bitrate, e.g. metadata based */
1405 if (parse->priv->bitrate) {
1406 parse->priv->avg_bitrate = parse->priv->bitrate;
1407 /* spread this (confirmed) info ASAP */
1408 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1409 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1413 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1417 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1418 parse->priv->avg_bitrate);
1420 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1422 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1423 /* always post all at threshold time */
1424 update_min = update_max = update_avg = TRUE;
1427 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1428 if (frame_bitrate < parse->priv->min_bitrate) {
1429 parse->priv->min_bitrate = frame_bitrate;
1433 if (frame_bitrate > parse->priv->max_bitrate) {
1434 parse->priv->max_bitrate = frame_bitrate;
1438 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1439 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1440 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1445 if ((update_min || update_avg || update_max))
1446 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1453 * gst_base_parse_add_index_entry:
1454 * @parse: #GstBaseParse.
1455 * @offset: offset of entry
1456 * @ts: timestamp associated with offset
1457 * @key: whether entry refers to keyframe
1458 * @force: add entry disregarding sanity checks
1460 * Adds an entry to the index associating @offset to @ts. It is recommended
1461 * to only add keyframe entries. @force allows to bypass checks, such as
1462 * whether the stream is (upstream) seekable, another entry is already "close"
1463 * to the new entry, etc.
1465 * Returns: #gboolean indicating whether entry was added
1470 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1471 GstClockTime ts, gboolean key, gboolean force)
1473 gboolean ret = FALSE;
1474 GstIndexAssociation associations[2];
1476 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1477 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1479 if (G_LIKELY (!force)) {
1481 if (!parse->priv->upstream_seekable) {
1482 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1486 /* FIXME need better helper data structure that handles these issues
1487 * related to ongoing collecting of index entries */
1488 if (parse->priv->index_last_offset >= (gint64) offset) {
1489 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1490 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1494 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1495 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1496 parse->priv->idx_interval) {
1497 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1498 GST_TIME_ARGS (parse->priv->index_last_ts));
1502 /* if last is not really the last one */
1503 if (!parse->priv->index_last_valid) {
1504 GstClockTime prev_ts;
1506 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1507 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1508 GST_DEBUG_OBJECT (parse,
1509 "entry too close to existing entry %" GST_TIME_FORMAT,
1510 GST_TIME_ARGS (prev_ts));
1511 parse->priv->index_last_offset = offset;
1512 parse->priv->index_last_ts = ts;
1518 associations[0].format = GST_FORMAT_TIME;
1519 associations[0].value = ts;
1520 associations[1].format = GST_FORMAT_BYTES;
1521 associations[1].value = offset;
1523 /* index might change on-the-fly, although that would be nutty app ... */
1524 GST_BASE_PARSE_INDEX_LOCK (parse);
1525 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1526 (key) ? GST_ASSOCIATION_FLAG_KEY_UNIT : GST_ASSOCIATION_FLAG_DELTA_UNIT,
1527 2, (const GstIndexAssociation *) &associations);
1528 GST_BASE_PARSE_INDEX_UNLOCK (parse);
1531 parse->priv->index_last_offset = offset;
1532 parse->priv->index_last_ts = ts;
1541 /* check for seekable upstream, above and beyond a mere query */
1543 gst_base_parse_check_seekability (GstBaseParse * parse)
1546 gboolean seekable = FALSE;
1547 gint64 start = -1, stop = -1;
1548 guint idx_interval = 0;
1550 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1551 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1552 GST_DEBUG_OBJECT (parse, "seeking query failed");
1556 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1558 /* try harder to query upstream size if we didn't get it the first time */
1559 if (seekable && stop == -1) {
1560 GstFormat fmt = GST_FORMAT_BYTES;
1562 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1563 gst_pad_query_peer_duration (parse->sinkpad, &fmt, &stop);
1566 /* if upstream doesn't know the size, it's likely that it's not seekable in
1567 * practice even if it technically may be seekable */
1568 if (seekable && (start != 0 || stop <= start)) {
1569 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1573 /* let's not put every single frame into our index */
1575 if (stop < 10 * 1024 * 1024)
1577 else if (stop < 100 * 1024 * 1024)
1580 idx_interval = 1000;
1584 gst_query_unref (query);
1586 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1587 G_GUINT64_FORMAT ")", seekable, start, stop);
1588 parse->priv->upstream_seekable = seekable;
1589 parse->priv->upstream_size = seekable ? stop : 0;
1591 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1592 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1595 /* some misc checks on upstream */
1597 gst_base_parse_check_upstream (GstBaseParse * parse)
1599 GstFormat fmt = GST_FORMAT_TIME;
1602 if (gst_pad_query_peer_duration (parse->sinkpad, &fmt, &stop))
1603 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1604 /* upstream has one, accept it also, and no further updates */
1605 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1606 parse->priv->upstream_has_duration = TRUE;
1609 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1610 parse->priv->upstream_has_duration);
1613 /* checks src caps to determine if dealing with audio or video */
1614 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1616 gst_base_parse_check_media (GstBaseParse * parse)
1621 caps = GST_PAD_CAPS (parse->srcpad);
1622 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1623 parse->priv->is_video =
1624 g_str_has_prefix (gst_structure_get_name (s), "video");
1626 /* historical default */
1627 parse->priv->is_video = FALSE;
1630 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1633 /* takes ownership of frame */
1635 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1637 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1638 /* frame allocated on the heap, we can just take ownership */
1639 g_queue_push_tail (&parse->priv->queued_frames, frame);
1640 GST_TRACE ("queued frame %p", frame);
1642 GstBaseParseFrame *copy;
1644 /* probably allocated on the stack, must make a proper copy */
1645 copy = gst_base_parse_frame_copy (frame);
1646 g_queue_push_tail (&parse->priv->queued_frames, copy);
1647 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1648 gst_base_parse_frame_free (frame);
1652 /* gst_base_parse_handle_and_push_buffer:
1653 * @parse: #GstBaseParse.
1654 * @klass: #GstBaseParseClass.
1655 * @frame: (transfer full): a #GstBaseParseFrame
1657 * Parses the frame from given buffer and pushes it forward. Also performs
1658 * timestamp handling and checks the segment limits.
1660 * This is called with srcpad STREAM_LOCK held.
1662 * Returns: #GstFlowReturn
1664 static GstFlowReturn
1665 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1666 GstBaseParseClass * klass, GstBaseParseFrame * frame)
1672 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1674 buffer = frame->buffer;
1676 if (parse->priv->discont) {
1677 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1678 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1679 parse->priv->discont = FALSE;
1682 /* some one-time start-up */
1683 if (G_UNLIKELY (!parse->priv->framecount)) {
1684 gst_base_parse_check_seekability (parse);
1685 gst_base_parse_check_upstream (parse);
1688 GST_LOG_OBJECT (parse,
1689 "parsing frame at offset %" G_GUINT64_FORMAT
1690 " (%#" G_GINT64_MODIFIER "x) of size %d",
1691 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1692 GST_BUFFER_SIZE (buffer));
1694 /* use default handler to provide initial (upstream) metadata */
1695 gst_base_parse_parse_frame (parse, frame);
1697 /* store offset as it might get overwritten */
1698 offset = GST_BUFFER_OFFSET (buffer);
1699 ret = klass->parse_frame (parse, frame);
1701 buffer = frame->buffer;
1702 /* subclass must play nice */
1703 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1705 /* check if subclass/format can provide ts.
1706 * If so, that allows and enables extra seek and duration determining options */
1707 if (G_UNLIKELY (parse->priv->first_frame_offset < 0 && ret == GST_FLOW_OK)) {
1708 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1709 && parse->priv->pad_mode == GST_ACTIVATE_PULL) {
1710 parse->priv->first_frame_offset = offset;
1711 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1712 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1713 " for first frame at offset %" G_GINT64_FORMAT,
1714 GST_TIME_ARGS (parse->priv->first_frame_ts),
1715 parse->priv->first_frame_offset);
1716 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1718 GstClockTime last_ts = G_MAXINT64;
1720 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1721 gst_base_parse_locate_time (parse, &last_ts, &off);
1722 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1723 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1726 /* disable further checks */
1727 parse->priv->first_frame_offset = 0;
1731 /* again use default handler to add missing metadata;
1732 * we may have new information on frame properties */
1733 gst_base_parse_parse_frame (parse, frame);
1734 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1735 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1736 parse->priv->next_ts =
1737 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1739 /* we lost track, do not produce bogus time next time around
1740 * (probably means parser subclass has given up on parsing as well) */
1741 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1742 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1745 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1746 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1747 gst_base_parse_add_index_entry (parse, offset,
1748 GST_BUFFER_TIMESTAMP (buffer),
1749 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1751 /* First buffers are dropped, this means that the subclass needs more
1752 * frames to decide on the format and queues them internally */
1753 /* convert internal flow to OK and mark discont for the next buffer. */
1754 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1755 gst_base_parse_frame_free (frame);
1757 } else if (ret == GST_BASE_PARSE_FLOW_QUEUED) {
1758 gst_base_parse_queue_frame (parse, frame);
1760 } else if (ret != GST_FLOW_OK) {
1764 /* All OK, push queued frames if there are any */
1765 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1766 GstBaseParseFrame *queued_frame;
1768 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1769 queued_frame->buffer =
1770 gst_buffer_make_metadata_writable (queued_frame->buffer);
1771 gst_buffer_set_caps (queued_frame->buffer,
1772 GST_PAD_CAPS (GST_BASE_PARSE_SRC_PAD (parse)));
1773 gst_base_parse_push_frame (parse, queued_frame);
1777 return gst_base_parse_push_frame (parse, frame);
1781 * gst_base_parse_push_frame:
1782 * @parse: #GstBaseParse.
1783 * @frame: (transfer full): a #GstBaseParseFrame
1785 * Pushes the frame downstream, sends any pending events and
1786 * does some timestamp and segment handling. Takes ownership
1787 * of @frame and will clear it (if it was initialised with
1788 * gst_base_parse_frame_init()) or free it.
1790 * This must be called with sinkpad STREAM_LOCK held.
1792 * Returns: #GstFlowReturn
1797 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1799 GstFlowReturn ret = GST_FLOW_OK;
1800 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1801 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1802 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1805 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1806 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1808 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1810 buffer = frame->buffer;
1812 GST_LOG_OBJECT (parse,
1813 "processing buffer of size %d with ts %" GST_TIME_FORMAT
1814 ", duration %" GST_TIME_FORMAT, GST_BUFFER_SIZE (buffer),
1815 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1816 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1819 parse->priv->bytecount += GST_BUFFER_SIZE (buffer);
1820 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1821 parse->priv->framecount++;
1822 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1823 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1826 /* 0 means disabled */
1827 if (parse->priv->update_interval < 0)
1828 parse->priv->update_interval = 50;
1829 else if (parse->priv->update_interval > 0 &&
1830 (parse->priv->framecount % parse->priv->update_interval) == 0)
1831 gst_base_parse_update_duration (parse);
1833 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1834 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1835 if (last_start != GST_CLOCK_TIME_NONE
1836 && GST_BUFFER_DURATION_IS_VALID (buffer))
1837 last_stop = last_start + GST_BUFFER_DURATION (buffer);
1839 /* should have caps by now */
1840 g_return_val_if_fail (GST_PAD_CAPS (parse->srcpad), GST_FLOW_ERROR);
1842 /* and should then also be linked downstream, so safe to send some events */
1843 if (G_UNLIKELY (parse->priv->close_segment)) {
1844 /* only set up by loop */
1845 GST_DEBUG_OBJECT (parse, "loop sending close segment");
1846 gst_pad_push_event (parse->srcpad, parse->priv->close_segment);
1847 parse->priv->close_segment = NULL;
1849 if (G_UNLIKELY (parse->priv->pending_segment)) {
1850 GstEvent *pending_segment;
1852 pending_segment = parse->priv->pending_segment;
1853 parse->priv->pending_segment = NULL;
1855 GST_DEBUG_OBJECT (parse, "%s push pending segment",
1856 parse->priv->pad_mode == GST_ACTIVATE_PULL ? "loop" : "chain");
1857 gst_pad_push_event (parse->srcpad, pending_segment);
1859 /* have caps; check identity */
1860 gst_base_parse_check_media (parse);
1863 if (G_UNLIKELY (parse->priv->pending_events)) {
1866 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
1867 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
1869 g_list_free (parse->priv->pending_events);
1870 parse->priv->pending_events = NULL;
1873 /* segment adjustment magic; only if we are running the whole show */
1874 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
1875 (parse->priv->pad_mode == GST_ACTIVATE_PULL ||
1876 parse->priv->upstream_seekable)) {
1878 if (GST_CLOCK_TIME_IS_VALID (parse->segment.last_stop) &&
1879 GST_CLOCK_TIME_IS_VALID (last_start)) {
1880 GstClockTimeDiff diff;
1882 /* only send newsegments with increasing start times,
1883 * otherwise if these go back and forth downstream (sinks) increase
1884 * accumulated time and running_time */
1885 diff = GST_CLOCK_DIFF (parse->segment.last_stop, last_start);
1886 if (G_UNLIKELY (diff > 2 * GST_SECOND
1887 && last_start > parse->segment.start
1888 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
1889 || last_start < parse->segment.stop))) {
1890 GST_DEBUG_OBJECT (parse,
1891 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
1892 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
1893 "Sending updated NEWSEGMENT events", diff,
1894 GST_TIME_ARGS (parse->segment.last_stop),
1895 GST_TIME_ARGS (last_start));
1897 /* send newsegment events such that the gap is not accounted in
1898 * accum time, hence running_time */
1899 /* close ahead of gap */
1900 gst_pad_push_event (parse->srcpad,
1901 gst_event_new_new_segment (TRUE, parse->segment.rate,
1902 parse->segment.format, parse->segment.last_stop,
1903 parse->segment.last_stop, parse->segment.last_stop));
1905 gst_pad_push_event (parse->srcpad,
1906 gst_event_new_new_segment (FALSE, parse->segment.rate,
1907 parse->segment.format, last_start,
1908 parse->segment.stop, last_start));
1910 /* align segment view with downstream,
1911 * prevents double-counting accum when closing segment */
1912 gst_segment_set_newsegment (&parse->segment, FALSE,
1913 parse->segment.rate, parse->segment.format, last_start,
1914 parse->segment.stop, last_start);
1915 parse->segment.last_stop = last_start;
1920 /* update bitrates and optionally post corresponding tags
1921 * (following newsegment) */
1922 gst_base_parse_update_bitrates (parse, frame);
1924 if (klass->pre_push_frame) {
1925 ret = klass->pre_push_frame (parse, frame);
1927 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
1930 /* take final ownership of frame buffer */
1931 buffer = frame->buffer;
1932 frame->buffer = NULL;
1934 /* subclass must play nice */
1935 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1938 buffer = gst_buffer_make_metadata_writable (buffer);
1939 gst_buffer_set_caps (buffer, GST_PAD_CAPS (parse->srcpad));
1941 parse->priv->seen_keyframe |= parse->priv->is_video &&
1942 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
1944 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
1945 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1946 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
1947 GST_BUFFER_TIMESTAMP (buffer) >
1948 parse->segment.stop + parse->priv->lead_out_ts) {
1949 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
1950 ret = GST_FLOW_UNEXPECTED;
1951 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1952 GST_BUFFER_DURATION_IS_VALID (buffer) &&
1953 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
1954 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
1955 parse->priv->lead_in_ts < parse->segment.start) {
1956 if (parse->priv->seen_keyframe) {
1957 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
1960 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
1961 ret = GST_BASE_PARSE_FLOW_DROPPED;
1968 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1969 GST_LOG_OBJECT (parse, "frame (%d bytes) dropped",
1970 GST_BUFFER_SIZE (buffer));
1971 gst_buffer_unref (buffer);
1973 } else if (ret == GST_FLOW_OK) {
1974 if (parse->segment.rate > 0.0) {
1975 GST_LOG_OBJECT (parse, "pushing frame (%d bytes) now..",
1976 GST_BUFFER_SIZE (buffer));
1977 ret = gst_pad_push (parse->srcpad, buffer);
1978 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
1980 GST_LOG_OBJECT (parse, "frame (%d bytes) queued for now",
1981 GST_BUFFER_SIZE (buffer));
1982 parse->priv->buffers_queued =
1983 g_slist_prepend (parse->priv->buffers_queued, buffer);
1987 GST_LOG_OBJECT (parse, "frame (%d bytes) not pushed: %s",
1988 GST_BUFFER_SIZE (buffer), gst_flow_get_name (ret));
1989 gst_buffer_unref (buffer);
1990 /* if we are not sufficiently in control, let upstream decide on EOS */
1991 if (ret == GST_FLOW_UNEXPECTED &&
1992 (parse->priv->passthrough ||
1993 (parse->priv->pad_mode == GST_ACTIVATE_PUSH &&
1994 !parse->priv->upstream_seekable)))
1998 /* Update current running segment position */
1999 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
2000 parse->segment.last_stop < last_stop)
2001 gst_segment_set_last_stop (&parse->segment, GST_FORMAT_TIME, last_stop);
2003 gst_base_parse_frame_free (frame);
2009 /* gst_base_parse_drain:
2011 * Drains the adapter until it is empty. It decreases the min_frame_size to
2012 * match the current adapter size and calls chain method until the adapter
2013 * is emptied or chain returns with error.
2016 gst_base_parse_drain (GstBaseParse * parse)
2020 GST_DEBUG_OBJECT (parse, "draining");
2021 parse->priv->drain = TRUE;
2024 avail = gst_adapter_available (parse->priv->adapter);
2028 if (gst_base_parse_chain (parse->sinkpad, NULL) != GST_FLOW_OK) {
2032 /* nothing changed, maybe due to truncated frame; break infinite loop */
2033 if (avail == gst_adapter_available (parse->priv->adapter)) {
2034 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2035 gst_adapter_clear (parse->priv->adapter);
2039 parse->priv->drain = FALSE;
2042 /* gst_base_parse_send_buffers
2044 * Sends buffers collected in send_buffers downstream, and ensures that list
2045 * is empty at the end (errors or not).
2047 static GstFlowReturn
2048 gst_base_parse_send_buffers (GstBaseParse * parse)
2050 GSList *send = NULL;
2052 GstFlowReturn ret = GST_FLOW_OK;
2054 send = parse->priv->buffers_send;
2058 buf = GST_BUFFER_CAST (send->data);
2059 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
2060 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2061 ", offset %" G_GINT64_FORMAT, buf,
2062 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
2063 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2065 /* iterate output queue an push downstream */
2066 ret = gst_pad_push (parse->srcpad, buf);
2067 send = g_slist_delete_link (send, send);
2069 /* clear any leftover if error */
2070 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2072 buf = GST_BUFFER_CAST (send->data);
2073 gst_buffer_unref (buf);
2074 send = g_slist_delete_link (send, send);
2079 parse->priv->buffers_send = send;
2084 /* gst_base_parse_process_fragment:
2086 * Processes a reverse playback (forward) fragment:
2087 * - append head of last fragment that was skipped to current fragment data
2088 * - drain the resulting current fragment data (i.e. repeated chain)
2089 * - add time/duration (if needed) to frames queued by chain
2090 * - push queued data
2092 static GstFlowReturn
2093 gst_base_parse_process_fragment (GstBaseParse * parse, gboolean push_only)
2096 GstFlowReturn ret = GST_FLOW_OK;
2097 gboolean seen_key = FALSE, seen_delta = FALSE;
2103 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2104 while (parse->priv->buffers_pending) {
2105 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2106 GST_LOG_OBJECT (parse, "adding pending buffer (size %d)",
2107 GST_BUFFER_SIZE (buf));
2108 gst_adapter_push (parse->priv->adapter, buf);
2109 parse->priv->buffers_pending =
2110 g_slist_delete_link (parse->priv->buffers_pending,
2111 parse->priv->buffers_pending);
2114 /* invalidate so no fall-back timestamping is performed;
2115 * ok if taken from subclass or upstream */
2116 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2117 /* prevent it hanging around stop all the time */
2118 parse->segment.last_stop = GST_CLOCK_TIME_NONE;
2120 parse->priv->discont = TRUE;
2122 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2123 /* initial skipped data is added to buffers_pending */
2124 gst_base_parse_drain (parse);
2127 if (parse->priv->buffers_send) {
2128 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2129 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2132 /* add metadata (if needed to queued buffers */
2133 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2134 GST_TIME_ARGS (parse->priv->last_ts));
2135 while (parse->priv->buffers_queued) {
2136 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2138 /* no touching if upstream or parsing provided time */
2139 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2140 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2141 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2142 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2143 GST_BUFFER_DURATION_IS_VALID (buf)) {
2144 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2145 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2147 parse->priv->last_ts = 0;
2148 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2149 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2150 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2152 /* no idea, very bad */
2153 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2156 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2158 /* reverse order for ascending sending */
2159 /* send downstream at keyframe not preceded by a keyframe
2160 * (e.g. that should identify start of collection of IDR nals) */
2161 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2163 ret = gst_base_parse_send_buffers (parse);
2164 /* if a problem, throw all to sending */
2165 if (ret != GST_FLOW_OK) {
2166 parse->priv->buffers_send =
2167 g_slist_reverse (parse->priv->buffers_queued);
2168 parse->priv->buffers_queued = NULL;
2178 parse->priv->buffers_send =
2179 g_slist_prepend (parse->priv->buffers_send, buf);
2180 parse->priv->buffers_queued =
2181 g_slist_delete_link (parse->priv->buffers_queued,
2182 parse->priv->buffers_queued);
2185 /* audio may have all marked as keyframe, so arrange to send here */
2187 ret = gst_base_parse_send_buffers (parse);
2189 /* any trailing unused no longer usable (ideally none) */
2190 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2191 GST_DEBUG_OBJECT (parse, "discarding %d trailing bytes",
2192 gst_adapter_available (parse->priv->adapter));
2193 gst_adapter_clear (parse->priv->adapter);
2199 /* small helper that checks whether we have been trying to resync too long */
2200 static inline GstFlowReturn
2201 gst_base_parse_check_sync (GstBaseParse * parse)
2203 if (G_UNLIKELY (parse->priv->discont &&
2204 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2205 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2206 ("Failed to parse stream"), (NULL));
2207 return GST_FLOW_ERROR;
2213 static GstFlowReturn
2214 gst_base_parse_chain (GstPad * pad, GstBuffer * buffer)
2216 GstBaseParseClass *bclass;
2217 GstBaseParse *parse;
2218 GstFlowReturn ret = GST_FLOW_OK;
2219 GstBuffer *outbuf = NULL;
2220 GstBuffer *tmpbuf = NULL;
2224 guint old_min_size = 0, min_size, av;
2225 GstClockTime timestamp;
2226 GstBaseParseFrame *frame;
2228 parse = GST_BASE_PARSE (GST_OBJECT_PARENT (pad));
2229 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2231 if (parse->priv->detecting) {
2232 GstBuffer *detect_buf;
2234 if (parse->priv->detect_buffers_size == 0) {
2235 detect_buf = gst_buffer_ref (buffer);
2241 gst_buffer_new_and_alloc (parse->priv->detect_buffers_size +
2242 (buffer ? GST_BUFFER_SIZE (buffer) : 0));
2243 for (l = parse->priv->detect_buffers; l; l = l->next) {
2244 memcpy (GST_BUFFER_DATA (detect_buf) + offset,
2245 GST_BUFFER_DATA (l->data), GST_BUFFER_SIZE (l->data));
2246 offset += GST_BUFFER_SIZE (l->data);
2249 memcpy (GST_BUFFER_DATA (detect_buf) + offset, GST_BUFFER_DATA (buffer),
2250 GST_BUFFER_SIZE (buffer));
2253 ret = bclass->detect (parse, detect_buf);
2254 gst_buffer_unref (detect_buf);
2256 if (ret == GST_FLOW_OK) {
2259 /* Detected something */
2260 parse->priv->detecting = FALSE;
2262 for (l = parse->priv->detect_buffers; l; l = l->next) {
2263 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2265 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2266 GST_BUFFER_CAST (l->data));
2268 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2270 g_list_free (parse->priv->detect_buffers);
2271 parse->priv->detect_buffers = NULL;
2272 parse->priv->detect_buffers_size = 0;
2274 if (ret != GST_FLOW_OK) {
2278 /* Handle the current buffer */
2279 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2280 /* Still detecting, append buffer or error out if draining */
2282 if (parse->priv->drain) {
2283 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2284 return GST_FLOW_ERROR;
2285 } else if (parse->priv->flushing) {
2286 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2288 g_list_free (parse->priv->detect_buffers);
2289 parse->priv->detect_buffers = NULL;
2290 parse->priv->detect_buffers_size = 0;
2292 parse->priv->detect_buffers =
2293 g_list_append (parse->priv->detect_buffers, buffer);
2294 parse->priv->detect_buffers_size += GST_BUFFER_SIZE (buffer);
2298 /* Something went wrong, subclass responsible for error reporting */
2302 /* And now handle the current buffer if detection worked */
2305 frame = &parse->priv->frame;
2307 if (G_LIKELY (buffer)) {
2308 GST_LOG_OBJECT (parse, "buffer size: %d, offset = %" G_GINT64_FORMAT,
2309 GST_BUFFER_SIZE (buffer), GST_BUFFER_OFFSET (buffer));
2310 if (G_UNLIKELY (parse->priv->passthrough)) {
2311 gst_base_parse_frame_init (frame);
2312 frame->buffer = gst_buffer_make_metadata_writable (buffer);
2313 return gst_base_parse_push_frame (parse, frame);
2315 /* upstream feeding us in reverse playback;
2316 * gather each fragment, then process it in single run */
2317 if (parse->segment.rate < 0.0) {
2318 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2319 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2320 ret = gst_base_parse_process_fragment (parse, FALSE);
2322 gst_adapter_push (parse->priv->adapter, buffer);
2325 gst_adapter_push (parse->priv->adapter, buffer);
2328 if (G_UNLIKELY (buffer &&
2329 GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2330 frame->_private_flags |= GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
2331 gst_base_parse_frame_free (frame);
2334 /* Parse and push as many frames as possible */
2335 /* Stop either when adapter is empty or we are flushing */
2336 while (!parse->priv->flushing) {
2339 /* maintain frame state for a single frame parsing round across _chain calls,
2340 * so only init when needed */
2341 if (!frame->_private_flags)
2342 gst_base_parse_frame_init (frame);
2344 tmpbuf = gst_buffer_new ();
2347 /* Synchronization loop */
2349 /* note: if subclass indicates MAX fsize,
2350 * this will not likely be available anyway ... */
2351 min_size = MAX (parse->priv->min_frame_size, fsize);
2352 av = gst_adapter_available (parse->priv->adapter);
2354 /* loop safety check */
2355 if (G_UNLIKELY (old_min_size >= min_size))
2357 old_min_size = min_size;
2359 if (G_UNLIKELY (parse->priv->drain)) {
2361 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2362 if (G_UNLIKELY (!min_size)) {
2363 gst_buffer_unref (tmpbuf);
2368 /* Collect at least min_frame_size bytes */
2369 if (av < min_size) {
2370 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)",
2372 gst_buffer_unref (tmpbuf);
2376 /* always pass all available data */
2377 data = gst_adapter_peek (parse->priv->adapter, av);
2378 GST_BUFFER_DATA (tmpbuf) = (guint8 *) data;
2379 GST_BUFFER_SIZE (tmpbuf) = av;
2380 GST_BUFFER_OFFSET (tmpbuf) = parse->priv->offset;
2381 GST_BUFFER_FLAG_SET (tmpbuf, GST_MINI_OBJECT_FLAG_READONLY);
2383 if (parse->priv->discont) {
2384 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2385 GST_BUFFER_FLAG_SET (tmpbuf, GST_BUFFER_FLAG_DISCONT);
2389 gst_base_parse_frame_update (parse, frame, tmpbuf);
2390 res = bclass->check_valid_frame (parse, frame, &fsize, &skip);
2391 gst_buffer_replace (&frame->buffer, NULL);
2393 if (gst_adapter_available (parse->priv->adapter) < fsize) {
2394 GST_DEBUG_OBJECT (parse,
2395 "found valid frame but not enough data available (only %d bytes)",
2396 gst_adapter_available (parse->priv->adapter));
2397 gst_buffer_unref (tmpbuf);
2400 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2404 /* subclass didn't touch this value. By default we skip 1 byte */
2408 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2409 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2410 /* reverse playback, and no frames found yet, so we are skipping
2411 * the leading part of a fragment, which may form the tail of
2412 * fragment coming later, hopefully subclass skips efficiently ... */
2413 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2414 outbuf = gst_adapter_take_buffer (parse->priv->adapter, skip);
2415 outbuf = gst_buffer_make_metadata_writable (outbuf);
2416 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
2417 parse->priv->buffers_pending =
2418 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2421 gst_adapter_flush (parse->priv->adapter, skip);
2423 parse->priv->offset += skip;
2424 if (!parse->priv->discont)
2425 parse->priv->sync_offset = parse->priv->offset;
2426 parse->priv->discont = TRUE;
2427 /* something changed least; nullify loop check */
2430 /* skip == 0 should imply subclass set min_size to need more data;
2431 * we check this shortly */
2432 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2433 gst_buffer_unref (tmpbuf);
2437 gst_buffer_unref (tmpbuf);
2441 /* Subclass found the sync, but still wants to skip some data */
2442 GST_LOG_OBJECT (parse, "skipping %d bytes", skip);
2443 gst_adapter_flush (parse->priv->adapter, skip);
2444 parse->priv->offset += skip;
2447 /* Grab lock to prevent a race with FLUSH_START handler */
2448 GST_PAD_STREAM_LOCK (parse->srcpad);
2450 /* FLUSH_START event causes the "flushing" flag to be set. In this
2451 * case we can leave the frame pushing loop */
2452 if (parse->priv->flushing) {
2453 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2457 /* move along with upstream timestamp (if any),
2458 * but interpolate in between */
2459 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2460 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2461 (parse->priv->prev_ts != timestamp)) {
2462 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2465 /* FIXME: Would it be more efficient to make a subbuffer instead? */
2466 outbuf = gst_adapter_take_buffer (parse->priv->adapter, fsize);
2467 outbuf = gst_buffer_make_metadata_writable (outbuf);
2469 /* Subclass may want to know the data offset */
2470 GST_BUFFER_OFFSET (outbuf) = parse->priv->offset;
2471 parse->priv->offset += fsize;
2472 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2473 GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
2475 frame->buffer = outbuf;
2476 ret = gst_base_parse_handle_and_push_frame (parse, bclass, frame);
2477 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2479 if (ret != GST_FLOW_OK) {
2480 GST_LOG_OBJECT (parse, "push returned %d", ret);
2486 GST_LOG_OBJECT (parse, "chain leaving");
2492 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2493 ("min_size evolution %d -> %d; breaking to avoid looping",
2494 old_min_size, min_size));
2495 return GST_FLOW_ERROR;
2499 /* pull @size bytes at current offset,
2500 * i.e. at least try to and possibly return a shorter buffer if near the end */
2501 static GstFlowReturn
2502 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2503 GstBuffer ** buffer)
2505 GstFlowReturn ret = GST_FLOW_OK;
2507 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2509 /* Caching here actually makes much less difference than one would expect.
2510 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2511 if (parse->priv->cache) {
2512 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2513 gint cache_size = GST_BUFFER_SIZE (parse->priv->cache);
2515 if (cache_offset <= parse->priv->offset &&
2516 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2517 *buffer = gst_buffer_create_sub (parse->priv->cache,
2518 parse->priv->offset - cache_offset, size);
2519 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2522 /* not enough data in the cache, free cache and get a new one */
2523 gst_buffer_unref (parse->priv->cache);
2524 parse->priv->cache = NULL;
2527 /* refill the cache */
2529 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2530 64 * 1024), &parse->priv->cache);
2531 if (ret != GST_FLOW_OK) {
2532 parse->priv->cache = NULL;
2536 if (GST_BUFFER_SIZE (parse->priv->cache) >= size) {
2537 *buffer = gst_buffer_create_sub (parse->priv->cache, 0, size);
2538 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2542 /* Not possible to get enough data, try a last time with
2543 * requesting exactly the size we need */
2544 gst_buffer_unref (parse->priv->cache);
2545 parse->priv->cache = NULL;
2547 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2548 &parse->priv->cache);
2550 if (ret != GST_FLOW_OK) {
2551 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2556 if (GST_BUFFER_SIZE (parse->priv->cache) < size) {
2557 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2558 G_GUINT64_FORMAT ": wanted %u bytes, got %u bytes", parse->priv->offset,
2559 size, GST_BUFFER_SIZE (parse->priv->cache));
2561 *buffer = parse->priv->cache;
2562 parse->priv->cache = NULL;
2567 *buffer = gst_buffer_create_sub (parse->priv->cache, 0, size);
2568 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2573 static GstFlowReturn
2574 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2577 GstClockTime ts = 0;
2581 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2582 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2583 parse->priv->last_offset);
2585 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2586 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2587 GST_TIME_ARGS (parse->segment.start));
2588 ret = GST_FLOW_UNEXPECTED;
2592 /* last fragment started at last_offset / last_ts;
2593 * seek back 10s capped at 1MB */
2594 if (parse->priv->last_ts >= 10 * GST_SECOND)
2595 ts = parse->priv->last_ts - 10 * GST_SECOND;
2596 /* if we are exact now, we will be more so going backwards */
2597 if (parse->priv->exact_position) {
2598 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2600 GstFormat dstformat = GST_FORMAT_BYTES;
2602 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2603 &dstformat, &offset)) {
2604 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2607 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2608 parse->priv->last_offset - 1024);
2609 offset = MAX (0, offset);
2611 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2613 parse->priv->offset = offset;
2615 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2617 if (ret != GST_FLOW_OK)
2620 /* offset will increase again as fragment is processed/parsed */
2621 parse->priv->last_offset = offset;
2623 gst_adapter_push (parse->priv->adapter, buffer);
2624 ret = gst_base_parse_process_fragment (parse, FALSE);
2625 if (ret != GST_FLOW_OK)
2628 /* force previous fragment */
2629 parse->priv->offset = -1;
2636 * pull and scan for next frame starting from current offset
2637 * ajusts sync, drain and offset going along */
2638 static GstFlowReturn
2639 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2640 GstBaseParseFrame * frame, gboolean full)
2642 GstBuffer *buffer, *outbuf;
2643 GstFlowReturn ret = GST_FLOW_OK;
2644 guint fsize = 1, min_size, old_min_size = 0;
2647 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2649 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2650 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2652 /* let's make this efficient for all subclass once and for all;
2653 * maybe it does not need this much, but in the latter case, we know we are
2654 * in pull mode here and might as well try to read and supply more anyway
2655 * (so does the buffer caching mechanism) */
2661 min_size = MAX (parse->priv->min_frame_size, fsize);
2662 /* loop safety check */
2663 if (G_UNLIKELY (old_min_size >= min_size))
2665 old_min_size = min_size;
2667 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2668 if (ret != GST_FLOW_OK)
2671 if (parse->priv->discont) {
2672 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2673 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
2676 /* if we got a short read, inform subclass we are draining leftover
2677 * and no more is to be expected */
2678 if (GST_BUFFER_SIZE (buffer) < min_size)
2679 parse->priv->drain = TRUE;
2681 if (parse->priv->detecting) {
2682 ret = klass->detect (parse, buffer);
2683 if (ret == GST_FLOW_NOT_NEGOTIATED) {
2684 /* If draining we error out, otherwise request a buffer
2686 if (parse->priv->drain) {
2687 gst_buffer_unref (buffer);
2688 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
2689 return GST_FLOW_ERROR;
2692 gst_buffer_unref (buffer);
2695 } else if (ret != GST_FLOW_OK) {
2696 gst_buffer_unref (buffer);
2697 GST_ERROR_OBJECT (parse, "detect() returned %s",
2698 gst_flow_get_name (ret));
2702 /* Else handle this buffer normally */
2706 gst_base_parse_frame_update (parse, frame, buffer);
2707 res = klass->check_valid_frame (parse, frame, &fsize, &skip);
2708 gst_buffer_replace (&frame->buffer, NULL);
2710 parse->priv->drain = FALSE;
2711 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2714 parse->priv->drain = FALSE;
2718 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2719 if (full && parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2720 /* reverse playback, and no frames found yet, so we are skipping
2721 * the leading part of a fragment, which may form the tail of
2722 * fragment coming later, hopefully subclass skips efficiently ... */
2723 outbuf = gst_buffer_create_sub (buffer, 0, skip);
2724 parse->priv->buffers_pending =
2725 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2728 parse->priv->offset += skip;
2729 if (!parse->priv->discont)
2730 parse->priv->sync_offset = parse->priv->offset;
2731 parse->priv->discont = TRUE;
2732 /* something changed at least; nullify loop check */
2733 if (fsize == G_MAXUINT)
2734 fsize = old_min_size + 64 * 1024;
2737 /* skip == 0 should imply subclass set min_size to need more data;
2738 * we check this shortly */
2739 GST_DEBUG_OBJECT (parse, "finding sync...");
2740 gst_buffer_unref (buffer);
2741 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2746 /* Does the subclass want to skip too? */
2748 parse->priv->offset += skip;
2752 if (fsize + skip <= GST_BUFFER_SIZE (buffer)) {
2753 outbuf = gst_buffer_create_sub (buffer, skip, fsize);
2754 GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer) + skip;
2755 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2756 gst_buffer_unref (buffer);
2758 gst_buffer_unref (buffer);
2759 ret = gst_base_parse_pull_range (parse, fsize, &outbuf);
2760 if (ret != GST_FLOW_OK)
2762 if (GST_BUFFER_SIZE (outbuf) < fsize) {
2763 gst_buffer_unref (outbuf);
2764 ret = GST_FLOW_UNEXPECTED;
2768 parse->priv->offset += fsize;
2770 frame->buffer = outbuf;
2778 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2779 ("min_size evolution %d -> %d; breaking to avoid looping",
2780 old_min_size, min_size));
2781 return GST_FLOW_ERROR;
2785 /* Loop that is used in pull mode to retrieve data from upstream */
2787 gst_base_parse_loop (GstPad * pad)
2789 GstBaseParse *parse;
2790 GstBaseParseClass *klass;
2791 GstFlowReturn ret = GST_FLOW_OK;
2792 GstBaseParseFrame frame;
2794 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2795 klass = GST_BASE_PARSE_GET_CLASS (parse);
2797 /* reverse playback:
2798 * first fragment (closest to stop time) is handled normally below,
2799 * then we pull in fragments going backwards */
2800 if (parse->segment.rate < 0.0) {
2801 /* check if we jumped back to a previous fragment,
2802 * which is a post-first fragment */
2803 if (parse->priv->offset < 0) {
2804 ret = gst_base_parse_handle_previous_fragment (parse);
2809 gst_base_parse_frame_init (&frame);
2810 ret = gst_base_parse_scan_frame (parse, klass, &frame, TRUE);
2811 if (ret != GST_FLOW_OK)
2814 /* This always cleans up frame, even if error occurs */
2815 ret = gst_base_parse_handle_and_push_frame (parse, klass, &frame);
2817 /* eat expected eos signalling past segment in reverse playback */
2818 if (parse->segment.rate < 0.0 && ret == GST_FLOW_UNEXPECTED &&
2819 parse->segment.last_stop >= parse->segment.stop) {
2820 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2821 /* push what was accumulated during loop run */
2822 gst_base_parse_process_fragment (parse, TRUE);
2823 /* force previous fragment */
2824 parse->priv->offset = -1;
2829 if (ret == GST_FLOW_UNEXPECTED)
2831 else if (ret != GST_FLOW_OK)
2834 gst_object_unref (parse);
2840 ret = GST_FLOW_UNEXPECTED;
2841 GST_DEBUG_OBJECT (parse, "eos");
2846 gboolean push_eos = FALSE;
2848 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2849 gst_flow_get_name (ret));
2850 gst_pad_pause_task (parse->sinkpad);
2852 if (ret == GST_FLOW_UNEXPECTED) {
2853 /* handle end-of-stream/segment */
2854 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2857 if ((stop = parse->segment.stop) == -1)
2858 stop = parse->segment.duration;
2860 GST_DEBUG_OBJECT (parse, "sending segment_done");
2862 gst_element_post_message
2863 (GST_ELEMENT_CAST (parse),
2864 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2865 GST_FORMAT_TIME, stop));
2867 /* If we STILL have zero frames processed, fire an error */
2868 if (parse->priv->framecount == 0) {
2869 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2870 ("No valid frames found before end of stream"), (NULL));
2874 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_UNEXPECTED) {
2875 /* for fatal errors we post an error message, wrong-state is
2876 * not fatal because it happens due to flushes and only means
2877 * that we should stop now. */
2878 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2879 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
2883 /* newsegment before eos */
2884 if (parse->priv->pending_segment) {
2885 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
2886 parse->priv->pending_segment = NULL;
2888 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
2890 gst_object_unref (parse);
2895 gst_base_parse_sink_activate (GstPad * sinkpad)
2897 GstBaseParse *parse;
2898 gboolean result = TRUE;
2900 parse = GST_BASE_PARSE (gst_pad_get_parent (sinkpad));
2902 GST_DEBUG_OBJECT (parse, "sink activate");
2904 if (gst_pad_check_pull_range (sinkpad)) {
2905 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
2906 result = gst_pad_activate_pull (sinkpad, TRUE);
2908 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
2909 result = gst_pad_activate_push (sinkpad, TRUE);
2912 GST_DEBUG_OBJECT (parse, "sink activate return %d", result);
2913 gst_object_unref (parse);
2918 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
2920 GstBaseParseClass *klass;
2921 gboolean result = TRUE;
2923 GST_DEBUG_OBJECT (parse, "activate %d", active);
2925 klass = GST_BASE_PARSE_GET_CLASS (parse);
2928 if (parse->priv->pad_mode == GST_ACTIVATE_NONE && klass->start)
2929 result = klass->start (parse);
2931 /* If the subclass implements ::detect we want to
2932 * call it for the first buffers now */
2933 parse->priv->detecting = (klass->detect != NULL);
2935 /* We must make sure streaming has finished before resetting things
2936 * and calling the ::stop vfunc */
2937 GST_PAD_STREAM_LOCK (parse->sinkpad);
2938 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
2940 if (parse->priv->pad_mode != GST_ACTIVATE_NONE && klass->stop)
2941 result = klass->stop (parse);
2943 parse->priv->pad_mode = GST_ACTIVATE_NONE;
2945 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
2950 gst_base_parse_sink_activate_push (GstPad * pad, gboolean active)
2952 gboolean result = TRUE;
2953 GstBaseParse *parse;
2955 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2957 GST_DEBUG_OBJECT (parse, "sink activate push %d", active);
2959 result = gst_base_parse_activate (parse, active);
2962 parse->priv->pad_mode = active ? GST_ACTIVATE_PUSH : GST_ACTIVATE_NONE;
2964 GST_DEBUG_OBJECT (parse, "sink activate push return: %d", result);
2966 gst_object_unref (parse);
2971 gst_base_parse_sink_activate_pull (GstPad * sinkpad, gboolean active)
2973 gboolean result = FALSE;
2974 GstBaseParse *parse;
2976 parse = GST_BASE_PARSE (gst_pad_get_parent (sinkpad));
2978 GST_DEBUG_OBJECT (parse, "activate pull %d", active);
2980 result = gst_base_parse_activate (parse, active);
2984 parse->priv->pending_segment = gst_event_new_new_segment (FALSE,
2985 parse->segment.rate, parse->segment.format,
2986 parse->segment.start, parse->segment.stop, parse->segment.last_stop);
2988 gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop,
2991 result &= gst_pad_stop_task (sinkpad);
2996 parse->priv->pad_mode = active ? GST_ACTIVATE_PULL : GST_ACTIVATE_NONE;
2998 GST_DEBUG_OBJECT (parse, "sink activate pull return: %d", result);
3000 gst_object_unref (parse);
3006 * gst_base_parse_set_duration:
3007 * @parse: #GstBaseParse.
3009 * @duration: duration value.
3010 * @interval: how often to update the duration estimate based on bitrate, or 0.
3012 * Sets the duration of the currently playing media. Subclass can use this
3013 * when it is able to determine duration and/or notices a change in the media
3014 * duration. Alternatively, if @interval is non-zero (default), then stream
3015 * duration is determined based on estimated bitrate, and updated every @interval
3021 gst_base_parse_set_duration (GstBaseParse * parse,
3022 GstFormat fmt, gint64 duration, gint interval)
3024 g_return_if_fail (parse != NULL);
3026 if (parse->priv->upstream_has_duration) {
3027 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3031 if (duration != parse->priv->duration) {
3034 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
3035 gst_element_post_message (GST_ELEMENT (parse), m);
3037 /* TODO: what about duration tag? */
3039 parse->priv->duration = duration;
3040 parse->priv->duration_fmt = fmt;
3041 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3042 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3043 if (interval != 0) {
3044 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3048 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3049 parse->priv->update_interval = interval;
3055 * gst_base_parse_set_average_bitrate:
3056 * @parse: #GstBaseParse.
3057 * @bitrate: average bitrate in bits/second
3059 * Optionally sets the average bitrate detected in media (if non-zero),
3060 * e.g. based on metadata, as it will be posted to the application.
3062 * By default, announced average bitrate is estimated. The average bitrate
3063 * is used to estimate the total duration of the stream and to estimate
3064 * a seek position, if there's no index and the format is syncable
3065 * (see gst_base_parse_set_syncable()).
3070 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3072 parse->priv->bitrate = bitrate;
3073 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3077 * gst_base_parse_set_min_frame_size:
3078 * @parse: #GstBaseParse.
3079 * @min_size: Minimum size of the data that this base class should give to
3082 * Subclass can use this function to tell the base class that it needs to
3083 * give at least #min_size buffers.
3088 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3090 g_return_if_fail (parse != NULL);
3092 parse->priv->min_frame_size = min_size;
3093 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3097 * gst_base_parse_set_frame_rate:
3098 * @parse: the #GstBaseParse to set
3099 * @fps_num: frames per second (numerator).
3100 * @fps_den: frames per second (denominator).
3101 * @lead_in: frames needed before a segment for subsequent decode
3102 * @lead_out: frames needed after a segment
3104 * If frames per second is configured, parser can take care of buffer duration
3105 * and timestamping. When performing segment clipping, or seeking to a specific
3106 * location, a corresponding decoder might need an initial @lead_in and a
3107 * following @lead_out number of frames to ensure the desired segment is
3108 * entirely filled upon decoding.
3113 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3114 guint fps_den, guint lead_in, guint lead_out)
3116 g_return_if_fail (parse != NULL);
3118 parse->priv->fps_num = fps_num;
3119 parse->priv->fps_den = fps_den;
3120 if (!fps_num || !fps_den) {
3121 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3123 fps_num = fps_den = 0;
3124 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3125 parse->priv->lead_in = parse->priv->lead_out = 0;
3126 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3128 parse->priv->frame_duration =
3129 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3130 parse->priv->lead_in = lead_in;
3131 parse->priv->lead_out = lead_out;
3132 parse->priv->lead_in_ts =
3133 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3134 parse->priv->lead_out_ts =
3135 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3136 /* aim for about 1.5s to estimate duration */
3137 if (parse->priv->update_interval < 0) {
3138 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3139 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3140 parse->priv->update_interval);
3143 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3144 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3145 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3146 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3147 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3148 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3152 * gst_base_parse_set_has_timing_info:
3153 * @parse: a #GstBaseParse
3154 * @has_timing: whether frames carry timing information
3156 * Set if frames carry timing information which the subclass can (generally)
3157 * parse and provide. In particular, intrinsic (rather than estimated) time
3158 * can be obtained following a seek.
3163 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3165 parse->priv->has_timing_info = has_timing;
3166 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3170 * gst_base_parse_set_syncable:
3171 * @parse: a #GstBaseParse
3172 * @syncable: set if frame starts can be identified
3174 * Set if frame starts can be identified. This is set by default and
3175 * determines whether seeking based on bitrate averages
3176 * is possible for a format/stream.
3181 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3183 parse->priv->syncable = syncable;
3184 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3188 * gst_base_parse_set_passthrough:
3189 * @parse: a #GstBaseParse
3190 * @passthrough: %TRUE if parser should run in passthrough mode
3192 * Set if the nature of the format or configuration does not allow (much)
3193 * parsing, and the parser should operate in passthrough mode (which only
3194 * applies when operating in push mode). That is, incoming buffers are
3195 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3196 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3197 * so subclass can perform as much or as little is appropriate for
3198 * passthrough semantics in @pre_push_frame.
3203 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3205 parse->priv->passthrough = passthrough;
3206 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3210 * gst_base_parse_set_latency:
3211 * @parse: a #GstBaseParse
3212 * @min_latency: minimum parse latency
3213 * @max_latency: maximum parse latency
3215 * Sets the minimum and maximum (which may likely be equal) latency introduced
3216 * by the parsing process. If there is such a latency, which depends on the
3217 * particular parsing of the format, it typically corresponds to 1 frame duration.
3222 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3223 GstClockTime max_latency)
3225 GST_OBJECT_LOCK (parse);
3226 parse->priv->min_latency = min_latency;
3227 parse->priv->max_latency = max_latency;
3228 GST_OBJECT_UNLOCK (parse);
3229 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3230 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3231 GST_TIME_ARGS (max_latency));
3235 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3236 GstClockTime * duration)
3238 gboolean res = FALSE;
3240 g_return_val_if_fail (duration != NULL, FALSE);
3242 *duration = GST_CLOCK_TIME_NONE;
3243 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3244 GST_LOG_OBJECT (parse, "using provided duration");
3245 *duration = parse->priv->duration;
3247 } else if (parse->priv->duration != -1) {
3248 GST_LOG_OBJECT (parse, "converting provided duration");
3249 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3250 parse->priv->duration, format, (gint64 *) duration);
3251 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3252 GST_LOG_OBJECT (parse, "using estimated duration");
3253 *duration = parse->priv->estimated_duration;
3257 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3258 GST_TIME_ARGS (*duration));
3262 static const GstQueryType *
3263 gst_base_parse_get_querytypes (GstPad * pad)
3265 static const GstQueryType list[] = {
3278 gst_base_parse_query (GstPad * pad, GstQuery * query)
3280 GstBaseParse *parse;
3281 gboolean res = FALSE;
3283 parse = GST_BASE_PARSE (GST_PAD_PARENT (pad));
3285 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3287 switch (GST_QUERY_TYPE (query)) {
3288 case GST_QUERY_POSITION:
3293 GST_DEBUG_OBJECT (parse, "position query");
3294 gst_query_parse_position (query, &format, NULL);
3296 /* try upstream first */
3297 res = gst_pad_query_default (pad, query);
3299 /* Fall back on interpreting segment */
3300 GST_OBJECT_LOCK (parse);
3301 if (format == GST_FORMAT_BYTES) {
3302 dest_value = parse->priv->offset;
3304 } else if (format == parse->segment.format &&
3305 GST_CLOCK_TIME_IS_VALID (parse->segment.last_stop)) {
3306 dest_value = gst_segment_to_stream_time (&parse->segment,
3307 parse->segment.format, parse->segment.last_stop);
3310 GST_OBJECT_UNLOCK (parse);
3312 /* no precise result, upstream no idea either, then best estimate */
3313 /* priv->offset is updated in both PUSH/PULL modes */
3314 res = gst_base_parse_convert (parse,
3315 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3318 gst_query_set_position (query, format, dest_value);
3322 case GST_QUERY_DURATION:
3325 GstClockTime duration;
3327 GST_DEBUG_OBJECT (parse, "duration query");
3328 gst_query_parse_duration (query, &format, NULL);
3330 /* consult upstream */
3331 res = gst_pad_query_default (pad, query);
3333 /* otherwise best estimate from us */
3335 res = gst_base_parse_get_duration (parse, format, &duration);
3337 gst_query_set_duration (query, format, duration);
3341 case GST_QUERY_SEEKING:
3344 GstClockTime duration = GST_CLOCK_TIME_NONE;
3345 gboolean seekable = FALSE;
3347 GST_DEBUG_OBJECT (parse, "seeking query");
3348 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3350 /* consult upstream */
3351 res = gst_pad_query_default (pad, query);
3353 /* we may be able to help if in TIME */
3354 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3355 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3356 /* already OK if upstream takes care */
3357 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3359 if (!(res && seekable)) {
3360 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3361 || duration == -1) {
3362 /* seekable if we still have a chance to get duration later on */
3364 parse->priv->upstream_seekable && parse->priv->update_interval;
3366 seekable = parse->priv->upstream_seekable;
3367 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3370 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3376 case GST_QUERY_FORMATS:
3377 gst_query_set_formatsv (query, 3, fmtlist);
3380 case GST_QUERY_CONVERT:
3382 GstFormat src_format, dest_format;
3383 gint64 src_value, dest_value;
3385 gst_query_parse_convert (query, &src_format, &src_value,
3386 &dest_format, &dest_value);
3388 res = gst_base_parse_convert (parse, src_format, src_value,
3389 dest_format, &dest_value);
3391 gst_query_set_convert (query, src_format, src_value,
3392 dest_format, dest_value);
3396 case GST_QUERY_LATENCY:
3398 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3400 GstClockTime min_latency, max_latency;
3402 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3403 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3404 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3405 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3407 GST_OBJECT_LOCK (parse);
3408 /* add our latency */
3409 if (min_latency != -1)
3410 min_latency += parse->priv->min_latency;
3411 if (max_latency != -1)
3412 max_latency += parse->priv->max_latency;
3413 GST_OBJECT_UNLOCK (parse);
3415 gst_query_set_latency (query, live, min_latency, max_latency);
3420 res = gst_pad_query_default (pad, query);
3426 /* scans for a cluster start from @pos,
3427 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3428 static GstFlowReturn
3429 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3430 GstClockTime * time, GstClockTime * duration)
3432 GstBaseParseClass *klass;
3434 gboolean orig_drain, orig_discont;
3435 GstFlowReturn ret = GST_FLOW_OK;
3436 GstBuffer *buf = NULL;
3437 GstBaseParseFrame frame;
3439 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3440 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3441 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3443 klass = GST_BASE_PARSE_GET_CLASS (parse);
3445 *time = GST_CLOCK_TIME_NONE;
3446 *duration = GST_CLOCK_TIME_NONE;
3449 orig_offset = parse->priv->offset;
3450 orig_discont = parse->priv->discont;
3451 orig_drain = parse->priv->drain;
3453 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3454 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3456 gst_base_parse_frame_init (&frame);
3458 /* jump elsewhere and locate next frame */
3459 parse->priv->offset = *pos;
3460 ret = gst_base_parse_scan_frame (parse, klass, &frame, FALSE);
3461 if (ret != GST_FLOW_OK)
3465 GST_LOG_OBJECT (parse,
3466 "peek parsing frame at offset %" G_GUINT64_FORMAT
3467 " (%#" G_GINT64_MODIFIER "x) of size %d",
3468 GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET (buf), GST_BUFFER_SIZE (buf));
3470 /* get offset first, subclass parsing might dump other stuff in there */
3471 *pos = GST_BUFFER_OFFSET (buf);
3472 ret = klass->parse_frame (parse, &frame);
3475 /* but it should provide proper time */
3476 *time = GST_BUFFER_TIMESTAMP (buf);
3477 *duration = GST_BUFFER_DURATION (buf);
3479 gst_base_parse_frame_free (&frame);
3481 GST_LOG_OBJECT (parse,
3482 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3483 GST_TIME_ARGS (*time), *pos);
3487 parse->priv->offset = orig_offset;
3488 parse->priv->discont = orig_discont;
3489 parse->priv->drain = orig_drain;
3494 /* bisect and scan through file for frame starting before @time,
3495 * returns OK and @time/@offset if found, NONE and/or error otherwise
3496 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3497 static GstFlowReturn
3498 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3501 GstFlowReturn ret = GST_FLOW_OK;
3502 gint64 lpos, hpos, newpos;
3503 GstClockTime time, ltime, htime, newtime, dur;
3504 gboolean cont = TRUE;
3505 const GstClockTime tolerance = TARGET_DIFFERENCE;
3506 const guint chunk = 4 * 1024;
3508 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3509 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3511 GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
3512 GST_TIME_ARGS (*_time));
3514 /* TODO also make keyframe aware if useful some day */
3529 /* do not know at first */
3531 *_time = GST_CLOCK_TIME_NONE;
3533 /* need initial positions; start and end */
3534 lpos = parse->priv->first_frame_offset;
3535 ltime = parse->priv->first_frame_ts;
3536 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
3537 GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
3538 return GST_FLOW_ERROR;
3540 hpos = parse->priv->upstream_size;
3542 GST_DEBUG_OBJECT (parse,
3543 "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
3544 ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, htime,
3545 GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
3547 /* check preconditions are satisfied;
3548 * start and end are needed, except for special case where we scan for
3549 * last frame to determine duration */
3550 if (parse->priv->pad_mode != GST_ACTIVATE_PULL || !hpos ||
3551 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3552 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3556 /* shortcut cases */
3559 } else if (time < ltime + tolerance) {
3563 } else if (time >= htime) {
3569 while (htime > ltime && cont) {
3570 GST_LOG_OBJECT (parse,
3571 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3572 GST_TIME_ARGS (ltime));
3573 GST_LOG_OBJECT (parse,
3574 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3575 GST_TIME_ARGS (htime));
3576 if (G_UNLIKELY (time == G_MAXINT64)) {
3578 } else if (G_LIKELY (hpos > lpos)) {
3580 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3583 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3585 /* we check this case once, but not forever, so break loop */
3590 newpos = CLAMP (newpos, lpos, hpos);
3591 GST_LOG_OBJECT (parse,
3592 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3593 GST_TIME_ARGS (time), newpos);
3595 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3596 if (ret == GST_FLOW_UNEXPECTED) {
3597 /* heuristic HACK */
3598 hpos = MAX (lpos, hpos - chunk);
3600 } else if (ret != GST_FLOW_OK) {
3604 if (newtime == -1 || newpos == -1) {
3605 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3609 if (G_UNLIKELY (time == G_MAXINT64)) {
3612 if (GST_CLOCK_TIME_IS_VALID (dur))
3615 } else if (newtime > time) {
3617 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3619 } else if (newtime + tolerance > time) {
3620 /* close enough undershoot */
3624 } else if (newtime < ltime) {
3625 /* so a position beyond lpos resulted in earlier time than ltime ... */
3626 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3629 /* undershoot too far */
3630 newpos += newpos == lpos ? chunk : 0;
3631 lpos = CLAMP (newpos, lpos, hpos);
3637 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3638 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3643 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3644 gboolean before, GstClockTime * _ts)
3646 gint64 bytes = 0, ts = 0;
3647 GstIndexEntry *entry = NULL;
3649 if (time == GST_CLOCK_TIME_NONE) {
3655 GST_BASE_PARSE_INDEX_LOCK (parse);
3656 if (parse->priv->index) {
3657 /* Let's check if we have an index entry for that time */
3658 entry = gst_index_get_assoc_entry (parse->priv->index,
3659 parse->priv->index_id,
3660 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3661 GST_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3665 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3666 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3668 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3669 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3670 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3672 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3673 GST_TIME_ARGS (time));
3676 ts = GST_CLOCK_TIME_NONE;
3679 GST_BASE_PARSE_INDEX_UNLOCK (parse);
3688 /* returns TRUE if seek succeeded */
3690 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3695 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3696 gboolean flush, update, res = TRUE, accurate;
3697 gint64 cur, stop, seekpos, seekstop;
3698 GstSegment seeksegment = { 0, };
3699 GstFormat dstformat;
3700 GstClockTime start_ts;
3702 gst_event_parse_seek (event, &rate, &format, &flags,
3703 &cur_type, &cur, &stop_type, &stop);
3705 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3706 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3707 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3708 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3710 /* no negative rates in push mode */
3711 if (rate < 0.0 && parse->priv->pad_mode == GST_ACTIVATE_PUSH)
3714 if (cur_type != GST_SEEK_TYPE_SET ||
3715 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3718 /* For any format other than TIME, see if upstream handles
3719 * it directly or fail. For TIME, try upstream, but do it ourselves if
3720 * it fails upstream */
3721 if (format != GST_FORMAT_TIME) {
3722 /* default action delegates to upstream */
3726 gst_event_ref (event);
3727 if ((res = gst_pad_push_event (parse->sinkpad, event))) {
3732 /* get flush flag */
3733 flush = flags & GST_SEEK_FLAG_FLUSH;
3735 /* copy segment, we need this because we still need the old
3736 * segment when we close the current segment. */
3737 memcpy (&seeksegment, &parse->segment, sizeof (GstSegment));
3739 GST_DEBUG_OBJECT (parse, "configuring seek");
3740 gst_segment_set_seek (&seeksegment, rate, format, flags,
3741 cur_type, cur, stop_type, stop, &update);
3743 /* accurate seeking implies seek tables are used to obtain position,
3744 * and the requested segment is maintained exactly, not adjusted any way */
3745 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3747 /* maybe we can be accurate for (almost) free */
3748 gst_base_parse_find_offset (parse, seeksegment.last_stop, TRUE, &start_ts);
3749 if (seeksegment.last_stop <= start_ts + TARGET_DIFFERENCE) {
3750 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3754 GstClockTime startpos = seeksegment.last_stop;
3756 /* accurate requested, so ... seek a bit before target */
3757 if (startpos < parse->priv->lead_in_ts)
3760 startpos -= parse->priv->lead_in_ts;
3761 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3762 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3765 start_ts = seeksegment.last_stop;
3766 dstformat = GST_FORMAT_BYTES;
3767 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.last_stop,
3768 &dstformat, &seekpos))
3769 goto convert_failed;
3770 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3771 &dstformat, &seekstop))
3772 goto convert_failed;
3775 GST_DEBUG_OBJECT (parse,
3776 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3778 GST_DEBUG_OBJECT (parse,
3779 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3780 seeksegment.stop, seekstop);
3782 if (parse->priv->pad_mode == GST_ACTIVATE_PULL) {
3785 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3788 if (parse->srcpad) {
3789 GST_DEBUG_OBJECT (parse, "sending flush start");
3790 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3791 /* unlock upstream pull_range */
3792 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3795 gst_pad_pause_task (parse->sinkpad);
3798 /* we should now be able to grab the streaming thread because we stopped it
3799 * with the above flush/pause code */
3800 GST_PAD_STREAM_LOCK (parse->sinkpad);
3802 /* save current position */
3803 last_stop = parse->segment.last_stop;
3804 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3807 /* now commit to new position */
3809 /* prepare for streaming again */
3811 GST_DEBUG_OBJECT (parse, "sending flush stop");
3812 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop ());
3813 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop ());
3814 gst_base_parse_clear_queues (parse);
3816 if (parse->priv->close_segment)
3817 gst_event_unref (parse->priv->close_segment);
3819 parse->priv->close_segment = gst_event_new_new_segment (TRUE,
3820 parse->segment.rate, parse->segment.format,
3821 parse->segment.accum, parse->segment.last_stop, parse->segment.accum);
3823 /* keep track of our last_stop */
3824 seeksegment.accum = parse->segment.last_stop;
3826 GST_DEBUG_OBJECT (parse, "Created close seg format %d, "
3827 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3828 ", pos = %" GST_TIME_FORMAT, format,
3829 GST_TIME_ARGS (parse->segment.accum),
3830 GST_TIME_ARGS (parse->segment.last_stop),
3831 GST_TIME_ARGS (parse->segment.accum));
3834 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3836 /* store the newsegment event so it can be sent from the streaming thread. */
3837 if (parse->priv->pending_segment)
3838 gst_event_unref (parse->priv->pending_segment);
3840 /* This will be sent later in _loop() */
3841 parse->priv->pending_segment =
3842 gst_event_new_new_segment (FALSE, parse->segment.rate,
3843 parse->segment.format, parse->segment.start,
3844 parse->segment.stop, parse->segment.start);
3846 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3847 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3848 ", pos = %" GST_TIME_FORMAT, format,
3849 GST_TIME_ARGS (parse->segment.start),
3850 GST_TIME_ARGS (parse->segment.stop),
3851 GST_TIME_ARGS (parse->segment.start));
3853 /* one last chance in pull mode to stay accurate;
3854 * maybe scan and subclass can find where to go */
3857 GstClockTime ts = seeksegment.last_stop;
3859 gst_base_parse_locate_time (parse, &ts, &scanpos);
3863 /* running collected index now consists of several intervals,
3864 * so optimized check no longer possible */
3865 parse->priv->index_last_valid = FALSE;
3866 parse->priv->index_last_offset = 0;
3867 parse->priv->index_last_ts = 0;
3871 /* mark discont if we are going to stream from another position. */
3872 if (seekpos != parse->priv->offset) {
3873 GST_DEBUG_OBJECT (parse,
3874 "mark DISCONT, we did a seek to another position");
3875 parse->priv->offset = seekpos;
3876 parse->priv->last_offset = seekpos;
3877 parse->priv->seen_keyframe = FALSE;
3878 parse->priv->discont = TRUE;
3879 parse->priv->next_ts = start_ts;
3880 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3881 parse->priv->sync_offset = seekpos;
3882 parse->priv->exact_position = accurate;
3885 /* Start streaming thread if paused */
3886 gst_pad_start_task (parse->sinkpad,
3887 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3889 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3894 GstEvent *new_event;
3895 GstBaseParseSeek *seek;
3896 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
3898 /* The only thing we need to do in PUSH-mode is to send the
3899 seek event (in bytes) to upstream. Segment / flush handling happens
3900 in corresponding src event handlers */
3901 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3902 if (seekstop >= 0 && seekpos <= seekpos)
3904 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
3905 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3907 /* store segment info so its precise details can be reconstructed when
3908 * receiving newsegment;
3909 * this matters for all details when accurate seeking,
3910 * is most useful to preserve NONE stop time otherwise */
3911 seek = g_new0 (GstBaseParseSeek, 1);
3912 seek->segment = seeksegment;
3913 seek->accurate = accurate;
3914 seek->offset = seekpos;
3915 seek->start_ts = start_ts;
3916 GST_OBJECT_LOCK (parse);
3917 /* less optimal, but preserves order */
3918 parse->priv->pending_seeks =
3919 g_slist_append (parse->priv->pending_seeks, seek);
3920 GST_OBJECT_UNLOCK (parse);
3922 res = gst_pad_push_event (parse->sinkpad, new_event);
3925 GST_OBJECT_LOCK (parse);
3926 parse->priv->pending_seeks =
3927 g_slist_remove (parse->priv->pending_seeks, seek);
3928 GST_OBJECT_UNLOCK (parse);
3934 /* handled event is ours to free */
3936 gst_event_unref (event);
3942 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
3948 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
3954 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
3960 /* Checks if bitrates are available from upstream tags so that we don't
3961 * override them later
3964 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
3966 GstTagList *taglist = NULL;
3969 gst_event_parse_tag (event, &taglist);
3971 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
3972 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
3973 parse->priv->post_min_bitrate = FALSE;
3975 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
3976 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
3977 parse->priv->post_avg_bitrate = FALSE;
3979 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
3980 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
3981 parse->priv->post_max_bitrate = FALSE;
3986 gst_base_parse_sink_setcaps (GstPad * pad, GstCaps * caps)
3988 GstBaseParse *parse;
3989 GstBaseParseClass *klass;
3990 gboolean res = TRUE;
3992 parse = GST_BASE_PARSE (GST_PAD_PARENT (pad));
3993 klass = GST_BASE_PARSE_GET_CLASS (parse);
3995 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
3997 if (klass->set_sink_caps)
3998 res = klass->set_sink_caps (parse, caps);
4004 gst_base_parse_sink_getcaps (GstPad * pad)
4006 GstBaseParse *parse;
4007 GstBaseParseClass *klass;
4010 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
4011 klass = GST_BASE_PARSE_GET_CLASS (parse);
4012 g_assert (pad == GST_BASE_PARSE_SINK_PAD (parse));
4014 if (klass->get_sink_caps)
4015 caps = klass->get_sink_caps (parse);
4017 caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
4018 gst_object_unref (parse);
4020 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT, caps);
4026 gst_base_parse_set_index (GstElement * element, GstIndex * index)
4028 GstBaseParse *parse = GST_BASE_PARSE (element);
4030 GST_BASE_PARSE_INDEX_LOCK (parse);
4031 if (parse->priv->index)
4032 gst_object_unref (parse->priv->index);
4034 parse->priv->index = gst_object_ref (index);
4035 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4036 &parse->priv->index_id);
4037 parse->priv->own_index = FALSE;
4039 parse->priv->index = NULL;
4041 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4045 gst_base_parse_get_index (GstElement * element)
4047 GstBaseParse *parse = GST_BASE_PARSE (element);
4048 GstIndex *result = NULL;
4050 GST_BASE_PARSE_INDEX_LOCK (parse);
4051 if (parse->priv->index)
4052 result = gst_object_ref (parse->priv->index);
4053 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4058 static GstStateChangeReturn
4059 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4061 GstBaseParse *parse;
4062 GstStateChangeReturn result;
4064 parse = GST_BASE_PARSE (element);
4066 switch (transition) {
4067 case GST_STATE_CHANGE_READY_TO_PAUSED:
4068 /* If this is our own index destroy it as the
4069 * old entries might be wrong for the new stream */
4070 GST_BASE_PARSE_INDEX_LOCK (parse);
4071 if (parse->priv->own_index) {
4072 gst_object_unref (parse->priv->index);
4073 parse->priv->index = NULL;
4074 parse->priv->own_index = FALSE;
4077 /* If no index was created, generate one */
4078 if (G_UNLIKELY (!parse->priv->index)) {
4079 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4081 parse->priv->index = gst_index_factory_make ("memindex");
4082 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4083 &parse->priv->index_id);
4084 parse->priv->own_index = TRUE;
4086 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4092 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4094 switch (transition) {
4095 case GST_STATE_CHANGE_PAUSED_TO_READY:
4096 gst_base_parse_reset (parse);