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_seeks = NULL;
470 gst_event_replace (&parse->priv->pending_segment, NULL);
474 gst_base_parse_finalize (GObject * object)
476 GstBaseParse *parse = GST_BASE_PARSE (object);
479 g_object_unref (parse->priv->adapter);
481 if (parse->priv->pending_segment) {
482 p_ev = &parse->priv->pending_segment;
483 gst_event_replace (p_ev, NULL);
485 if (parse->priv->close_segment) {
486 p_ev = &parse->priv->close_segment;
487 gst_event_replace (p_ev, NULL);
490 if (parse->priv->cache) {
491 gst_buffer_unref (parse->priv->cache);
492 parse->priv->cache = NULL;
495 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
497 g_list_free (parse->priv->pending_events);
498 parse->priv->pending_events = NULL;
500 if (parse->priv->index) {
501 gst_object_unref (parse->priv->index);
502 parse->priv->index = NULL;
504 #if !GLIB_CHECK_VERSION (2, 31, 0)
505 g_static_mutex_free (&parse->priv->index_lock);
507 g_mutex_clear (&parse->priv->index_lock);
510 gst_base_parse_clear_queues (parse);
512 G_OBJECT_CLASS (parent_class)->finalize (object);
516 gst_base_parse_class_init (GstBaseParseClass * klass)
518 GObjectClass *gobject_class;
519 GstElementClass *gstelement_class;
521 gobject_class = G_OBJECT_CLASS (klass);
522 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
523 parent_class = g_type_class_peek_parent (klass);
524 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
526 gstelement_class = (GstElementClass *) klass;
527 gstelement_class->change_state =
528 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
529 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
530 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
532 /* Default handlers */
533 klass->check_valid_frame = gst_base_parse_check_frame;
534 klass->parse_frame = gst_base_parse_parse_frame;
535 klass->src_event = gst_base_parse_src_eventfunc;
536 klass->convert = gst_base_parse_convert_default;
538 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
539 "baseparse element");
543 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
545 GstPadTemplate *pad_template;
547 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
549 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
552 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
553 g_return_if_fail (pad_template != NULL);
554 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
555 gst_pad_set_event_function (parse->sinkpad,
556 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
557 gst_pad_set_setcaps_function (parse->sinkpad,
558 GST_DEBUG_FUNCPTR (gst_base_parse_sink_setcaps));
559 gst_pad_set_getcaps_function (parse->sinkpad,
560 GST_DEBUG_FUNCPTR (gst_base_parse_sink_getcaps));
561 gst_pad_set_chain_function (parse->sinkpad,
562 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
563 gst_pad_set_activate_function (parse->sinkpad,
564 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
565 gst_pad_set_activatepush_function (parse->sinkpad,
566 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_push));
567 gst_pad_set_activatepull_function (parse->sinkpad,
568 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_pull));
569 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
571 GST_DEBUG_OBJECT (parse, "sinkpad created");
574 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
575 g_return_if_fail (pad_template != NULL);
576 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
577 gst_pad_set_event_function (parse->srcpad,
578 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
579 gst_pad_set_query_type_function (parse->srcpad,
580 GST_DEBUG_FUNCPTR (gst_base_parse_get_querytypes));
581 gst_pad_set_query_function (parse->srcpad,
582 GST_DEBUG_FUNCPTR (gst_base_parse_query));
583 gst_pad_use_fixed_caps (parse->srcpad);
584 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
585 GST_DEBUG_OBJECT (parse, "src created");
587 g_queue_init (&parse->priv->queued_frames);
589 parse->priv->adapter = gst_adapter_new ();
591 parse->priv->pad_mode = GST_ACTIVATE_NONE;
593 #if !GLIB_CHECK_VERSION (2, 31, 0)
594 g_static_mutex_init (&parse->priv->index_lock);
596 g_mutex_init (&parse->priv->index_lock);
600 gst_base_parse_reset (parse);
601 GST_DEBUG_OBJECT (parse, "init ok");
604 static GstBaseParseFrame *
605 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
607 GstBaseParseFrame *copy;
609 copy = g_slice_dup (GstBaseParseFrame, frame);
610 copy->buffer = gst_buffer_ref (frame->buffer);
611 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
613 GST_TRACE ("copied frame %p -> %p", frame, copy);
619 gst_base_parse_frame_free (GstBaseParseFrame * frame)
621 GST_TRACE ("freeing frame %p", frame);
624 gst_buffer_unref (frame->buffer);
625 frame->buffer = NULL;
628 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
629 g_slice_free (GstBaseParseFrame, frame);
631 memset (frame, 0, sizeof (*frame));
636 gst_base_parse_frame_get_type (void)
638 static volatile gsize frame_type = 0;
640 if (g_once_init_enter (&frame_type)) {
643 _type = g_boxed_type_register_static ("GstBaseParseFrame",
644 (GBoxedCopyFunc) gst_base_parse_frame_copy,
645 (GBoxedFreeFunc) gst_base_parse_frame_free);
646 g_once_init_leave (&frame_type, _type);
648 return (GType) frame_type;
652 * gst_base_parse_frame_init:
653 * @frame: #GstBaseParseFrame.
655 * Sets a #GstBaseParseFrame to initial state. Currently this means
656 * all public fields are zero-ed and a private flag is set to make
657 * sure gst_base_parse_frame_free() only frees the contents but not
658 * the actual frame. Use this function to initialise a #GstBaseParseFrame
659 * allocated on the stack.
664 gst_base_parse_frame_init (GstBaseParseFrame * frame)
666 memset (frame, 0, sizeof (GstBaseParseFrame));
667 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
668 GST_TRACE ("inited frame %p", frame);
672 * gst_base_parse_frame_new:
673 * @buffer: (transfer none): a #GstBuffer
675 * @overhead: number of bytes in this frame which should be counted as
676 * metadata overhead, ie. not used to calculate the average bitrate.
677 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
679 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
680 * elements written in C should usually allocate the frame on the stack and
681 * then use gst_base_parse_frame_init() to initialise it.
683 * Returns: a newly-allocated #GstBaseParseFrame. Free with
684 * gst_base_parse_frame_free() when no longer needed, unless you gave
685 * away ownership to gst_base_parse_push_frame().
690 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
693 GstBaseParseFrame *frame;
695 frame = g_slice_new0 (GstBaseParseFrame);
696 frame->buffer = gst_buffer_ref (buffer);
698 GST_TRACE ("created frame %p", frame);
703 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
706 gst_buffer_replace (&frame->buffer, buf);
710 /* set flags one by one for clarity */
711 if (G_UNLIKELY (parse->priv->drain))
712 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
714 /* losing sync is pretty much a discont (and vice versa), no ? */
715 if (G_UNLIKELY (parse->priv->discont))
716 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
720 gst_base_parse_reset (GstBaseParse * parse)
722 GST_OBJECT_LOCK (parse);
723 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
724 parse->priv->duration = -1;
725 parse->priv->min_frame_size = 1;
726 parse->priv->discont = TRUE;
727 parse->priv->flushing = FALSE;
728 parse->priv->offset = 0;
729 parse->priv->sync_offset = 0;
730 parse->priv->update_interval = -1;
731 parse->priv->fps_num = parse->priv->fps_den = 0;
732 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
733 parse->priv->lead_in = parse->priv->lead_out = 0;
734 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
735 parse->priv->bitrate = 0;
736 parse->priv->framecount = 0;
737 parse->priv->bytecount = 0;
738 parse->priv->acc_duration = 0;
739 parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE;
740 parse->priv->first_frame_offset = -1;
741 parse->priv->estimated_duration = -1;
742 parse->priv->estimated_drift = 0;
743 parse->priv->next_ts = 0;
744 parse->priv->syncable = TRUE;
745 parse->priv->passthrough = FALSE;
746 parse->priv->has_timing_info = FALSE;
747 parse->priv->post_min_bitrate = TRUE;
748 parse->priv->post_avg_bitrate = TRUE;
749 parse->priv->post_max_bitrate = TRUE;
750 parse->priv->min_bitrate = G_MAXUINT;
751 parse->priv->max_bitrate = 0;
752 parse->priv->avg_bitrate = 0;
753 parse->priv->posted_avg_bitrate = 0;
755 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
756 parse->priv->index_last_offset = -1;
757 parse->priv->index_last_valid = TRUE;
758 parse->priv->upstream_seekable = FALSE;
759 parse->priv->upstream_size = 0;
760 parse->priv->upstream_has_duration = FALSE;
761 parse->priv->idx_interval = 0;
762 parse->priv->exact_position = TRUE;
763 parse->priv->seen_keyframe = FALSE;
765 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
766 parse->priv->last_offset = 0;
768 if (parse->priv->pending_segment) {
769 gst_event_unref (parse->priv->pending_segment);
770 parse->priv->pending_segment = NULL;
773 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
775 g_list_free (parse->priv->pending_events);
776 parse->priv->pending_events = NULL;
778 if (parse->priv->cache) {
779 gst_buffer_unref (parse->priv->cache);
780 parse->priv->cache = NULL;
783 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
784 g_slist_free (parse->priv->pending_seeks);
785 parse->priv->pending_seeks = NULL;
787 if (parse->priv->adapter)
788 gst_adapter_clear (parse->priv->adapter);
790 /* we know it is not alloc'ed, but maybe other stuff to free, some day ... */
791 parse->priv->frame._private_flags |=
792 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
793 gst_base_parse_frame_free (&parse->priv->frame);
795 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
796 g_list_free (parse->priv->detect_buffers);
797 parse->priv->detect_buffers = NULL;
798 parse->priv->detect_buffers_size = 0;
799 GST_OBJECT_UNLOCK (parse);
802 /* gst_base_parse_check_frame:
803 * @parse: #GstBaseParse.
804 * @buffer: GstBuffer.
805 * @framesize: This will be set to tell the found frame size in bytes.
806 * @skipsize: Output parameter that tells how much data needs to be skipped
807 * in order to find the following frame header.
809 * Default callback for check_valid_frame.
811 * Returns: Always TRUE.
814 gst_base_parse_check_frame (GstBaseParse * parse,
815 GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
817 *framesize = GST_BUFFER_SIZE (frame->buffer);
823 /* gst_base_parse_parse_frame:
824 * @parse: #GstBaseParse.
825 * @buffer: #GstBuffer.
827 * Default callback for parse_frame.
830 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
832 GstBuffer *buffer = frame->buffer;
834 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
835 GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) {
836 GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts;
838 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
839 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
840 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
845 /* gst_base_parse_convert:
846 * @parse: #GstBaseParse.
847 * @src_format: #GstFormat describing the source format.
848 * @src_value: Source value to be converted.
849 * @dest_format: #GstFormat defining the converted format.
850 * @dest_value: Pointer where the conversion result will be put.
852 * Converts using configured "convert" vmethod in #GstBaseParse class.
854 * Returns: TRUE if conversion was successful.
857 gst_base_parse_convert (GstBaseParse * parse,
858 GstFormat src_format,
859 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
861 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
864 g_return_val_if_fail (dest_value != NULL, FALSE);
869 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
871 #ifndef GST_DISABLE_GST_DEBUG
874 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
875 GST_LOG_OBJECT (parse,
876 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
877 GST_TIME_ARGS (src_value), *dest_value);
878 } else if (dest_format == GST_FORMAT_TIME &&
879 src_format == GST_FORMAT_BYTES) {
880 GST_LOG_OBJECT (parse,
881 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
882 src_value, GST_TIME_ARGS (*dest_value));
884 GST_LOG_OBJECT (parse,
885 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
886 GST_STR_NULL (gst_format_get_name (src_format)),
887 GST_STR_NULL (gst_format_get_name (dest_format)),
888 src_value, *dest_value);
891 GST_DEBUG_OBJECT (parse, "conversion failed");
899 /* gst_base_parse_sink_event:
900 * @pad: #GstPad that received the event.
901 * @event: #GstEvent to be handled.
903 * Handler for sink pad events.
905 * Returns: TRUE if the event was handled.
908 gst_base_parse_sink_event (GstPad * pad, GstEvent * event)
911 GstBaseParseClass *bclass;
912 gboolean handled = FALSE;
915 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
916 bclass = GST_BASE_PARSE_GET_CLASS (parse);
918 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
919 GST_EVENT_TYPE_NAME (event));
921 /* Cache all serialized events except EOS, NEWSEGMENT and FLUSH_STOP if we have a
923 if (parse->priv->pending_segment && GST_EVENT_IS_SERIALIZED (event)
924 && GST_EVENT_TYPE (event) != GST_EVENT_EOS
925 && GST_EVENT_TYPE (event) != GST_EVENT_NEWSEGMENT
926 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
927 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP) {
929 if (GST_EVENT_TYPE (event) == GST_EVENT_TAG)
930 /* See if any bitrate tags were posted */
931 gst_base_parse_handle_tag (parse, event);
933 parse->priv->pending_events =
934 g_list_append (parse->priv->pending_events, event);
938 if (GST_EVENT_TYPE (event) == GST_EVENT_EOS &&
939 parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
940 /* We've not posted bitrate tags yet - do so now */
941 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
944 handled = bclass->event (parse, event);
947 handled = gst_base_parse_sink_eventfunc (parse, event);
950 ret = gst_pad_event_default (pad, event);
953 gst_object_unref (parse);
954 GST_DEBUG_OBJECT (parse, "event handled");
959 /* gst_base_parse_sink_eventfunc:
960 * @parse: #GstBaseParse.
961 * @event: #GstEvent to be handled.
963 * Element-level event handler function.
965 * The event will be unreffed only if it has been handled and this
966 * function returns %TRUE
968 * Returns: %TRUE if the event was handled and not need forwarding.
971 gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event)
973 gboolean handled = FALSE;
976 switch (GST_EVENT_TYPE (event)) {
977 case GST_EVENT_NEWSEGMENT:
979 gdouble rate, applied_rate;
981 gint64 start, stop, pos, next_ts, offset = 0;
984 gst_event_parse_new_segment_full (event, &update, &rate, &applied_rate,
985 &format, &start, &stop, &pos);
987 GST_DEBUG_OBJECT (parse, "newseg rate %g, applied rate %g, "
988 "format %d, start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
989 ", pos = %" GST_TIME_FORMAT, rate, applied_rate, format,
990 GST_TIME_ARGS (start), GST_TIME_ARGS (stop), GST_TIME_ARGS (pos));
992 if (format == GST_FORMAT_BYTES) {
993 GstClockTime seg_start, seg_stop;
994 GstBaseParseSeek *seek = NULL;
997 /* stop time is allowed to be open-ended, but not start & pos */
998 seg_stop = GST_CLOCK_TIME_NONE;
1002 GST_OBJECT_LOCK (parse);
1003 for (node = parse->priv->pending_seeks; node; node = node->next) {
1004 GstBaseParseSeek *tmp = node->data;
1006 if (tmp->offset == pos) {
1011 parse->priv->pending_seeks =
1012 g_slist_remove (parse->priv->pending_seeks, seek);
1013 GST_OBJECT_UNLOCK (parse);
1016 GST_DEBUG_OBJECT (parse,
1017 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
1018 seek->accurate ? " accurate" : "", &seek->segment);
1019 seg_start = seek->segment.start;
1020 seg_stop = seek->segment.stop;
1021 next_ts = seek->start_ts;
1022 parse->priv->exact_position = seek->accurate;
1025 /* best attempt convert */
1026 /* as these are only estimates, stop is kept open-ended to avoid
1027 * premature cutting */
1028 gst_base_parse_convert (parse, GST_FORMAT_BYTES, start,
1029 GST_FORMAT_TIME, (gint64 *) & seg_start);
1030 parse->priv->exact_position = (start == 0);
1031 next_ts = seg_start;
1034 gst_event_unref (event);
1035 event = gst_event_new_new_segment_full (update, rate, applied_rate,
1036 GST_FORMAT_TIME, seg_start, seg_stop, seg_start);
1037 format = GST_FORMAT_TIME;
1040 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. "
1041 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT,
1042 GST_TIME_ARGS (seg_start), GST_TIME_ARGS (seg_stop));
1043 } else if (format != GST_FORMAT_TIME) {
1044 /* Unknown incoming segment format. Output a default open-ended
1046 gst_event_unref (event);
1047 event = gst_event_new_new_segment_full (update, rate, applied_rate,
1048 GST_FORMAT_TIME, 0, GST_CLOCK_TIME_NONE, 0);
1049 format = GST_FORMAT_TIME;
1050 next_ts = start = 0;
1051 stop = GST_CLOCK_TIME_NONE;
1053 /* not considered BYTE seekable if it is talking to us in TIME,
1054 * whatever else it might claim */
1055 parse->priv->upstream_seekable = FALSE;
1059 gst_segment_set_newsegment_full (&parse->segment, update, rate,
1060 applied_rate, format, start, stop, start);
1062 /* save the segment for later, right before we push a new buffer so that
1063 * the caps are fixed and the next linked element can receive
1065 eventp = &parse->priv->pending_segment;
1066 gst_event_replace (eventp, event);
1067 gst_event_unref (event);
1070 /* but finish the current segment */
1071 GST_DEBUG_OBJECT (parse, "draining current segment");
1072 if (parse->segment.rate > 0.0)
1073 gst_base_parse_drain (parse);
1075 gst_base_parse_process_fragment (parse, FALSE);
1076 gst_adapter_clear (parse->priv->adapter);
1077 parse->priv->offset = offset;
1078 parse->priv->sync_offset = offset;
1079 parse->priv->next_ts = next_ts;
1080 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1081 parse->priv->discont = TRUE;
1082 parse->priv->seen_keyframe = FALSE;
1086 case GST_EVENT_FLUSH_START:
1087 parse->priv->flushing = TRUE;
1088 handled = gst_pad_push_event (parse->srcpad, gst_event_ref (event));
1090 gst_event_unref (event);
1091 /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
1092 GST_PAD_STREAM_LOCK (parse->srcpad);
1093 GST_PAD_STREAM_UNLOCK (parse->srcpad);
1097 case GST_EVENT_FLUSH_STOP:
1098 gst_adapter_clear (parse->priv->adapter);
1099 gst_base_parse_clear_queues (parse);
1100 parse->priv->flushing = FALSE;
1101 parse->priv->discont = TRUE;
1102 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1103 parse->priv->frame._private_flags |=
1104 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
1105 gst_base_parse_frame_free (&parse->priv->frame);
1109 if (parse->segment.rate > 0.0)
1110 gst_base_parse_drain (parse);
1112 gst_base_parse_process_fragment (parse, FALSE);
1114 /* If we STILL have zero frames processed, fire an error */
1115 if (parse->priv->framecount == 0) {
1116 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1117 ("No valid frames found before end of stream"), (NULL));
1119 /* newsegment before eos */
1120 if (parse->priv->pending_segment) {
1121 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
1122 parse->priv->pending_segment = NULL;
1134 /* gst_base_parse_src_event:
1135 * @pad: #GstPad that received the event.
1136 * @event: #GstEvent that was received.
1138 * Handler for source pad events.
1140 * Returns: TRUE if the event was handled.
1143 gst_base_parse_src_event (GstPad * pad, GstEvent * event)
1145 GstBaseParse *parse;
1146 GstBaseParseClass *bclass;
1147 gboolean handled = FALSE;
1148 gboolean ret = TRUE;
1150 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
1151 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1153 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1154 GST_EVENT_TYPE_NAME (event));
1156 if (bclass->src_event)
1157 handled = bclass->src_event (parse, event);
1160 ret = gst_pad_event_default (pad, event);
1162 gst_object_unref (parse);
1167 gst_base_parse_is_seekable (GstBaseParse * parse)
1169 /* FIXME: could do more here, e.g. check index or just send data from 0
1170 * in pull mode and let decoder/sink clip */
1171 return parse->priv->syncable;
1174 /* gst_base_parse_src_eventfunc:
1175 * @parse: #GstBaseParse.
1176 * @event: #GstEvent that was received.
1178 * Default srcpad event handler.
1180 * Returns: TRUE if the event was handled and can be dropped.
1183 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1185 gboolean handled = FALSE;
1187 switch (GST_EVENT_TYPE (event)) {
1188 case GST_EVENT_SEEK:
1190 if (gst_base_parse_is_seekable (parse)) {
1191 handled = gst_base_parse_handle_seek (parse, event);
1203 * gst_base_parse_convert_default:
1204 * @parse: #GstBaseParse.
1205 * @src_format: #GstFormat describing the source format.
1206 * @src_value: Source value to be converted.
1207 * @dest_format: #GstFormat defining the converted format.
1208 * @dest_value: Pointer where the conversion result will be put.
1210 * Default implementation of "convert" vmethod in #GstBaseParse class.
1212 * Returns: TRUE if conversion was successful.
1217 gst_base_parse_convert_default (GstBaseParse * parse,
1218 GstFormat src_format,
1219 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1221 gboolean ret = FALSE;
1222 guint64 bytes, duration;
1224 if (G_UNLIKELY (src_format == dest_format)) {
1225 *dest_value = src_value;
1229 if (G_UNLIKELY (src_value == -1)) {
1234 if (G_UNLIKELY (src_value == 0)) {
1239 /* need at least some frames */
1240 if (!parse->priv->framecount)
1243 duration = parse->priv->acc_duration / GST_MSECOND;
1244 bytes = parse->priv->bytecount;
1246 if (G_UNLIKELY (!duration || !bytes))
1249 if (src_format == GST_FORMAT_BYTES) {
1250 if (dest_format == GST_FORMAT_TIME) {
1251 /* BYTES -> TIME conversion */
1252 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1253 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1254 *dest_value *= GST_MSECOND;
1255 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1256 *dest_value / GST_MSECOND);
1259 } else if (src_format == GST_FORMAT_TIME) {
1260 if (dest_format == GST_FORMAT_BYTES) {
1261 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1262 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1264 GST_DEBUG_OBJECT (parse,
1265 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1266 src_value / GST_MSECOND, *dest_value);
1269 } else if (src_format == GST_FORMAT_DEFAULT) {
1270 /* DEFAULT == frame-based */
1271 if (dest_format == GST_FORMAT_TIME) {
1272 if (parse->priv->fps_den) {
1273 *dest_value = gst_util_uint64_scale (src_value,
1274 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1277 } else if (dest_format == GST_FORMAT_BYTES) {
1285 gst_base_parse_update_duration (GstBaseParse * baseparse)
1288 GstBaseParse *parse;
1290 parse = GST_BASE_PARSE (baseparse);
1292 peer = gst_pad_get_peer (parse->sinkpad);
1294 GstFormat pformat = GST_FORMAT_BYTES;
1295 gboolean qres = FALSE;
1296 gint64 ptot, dest_value;
1298 qres = gst_pad_query_duration (peer, &pformat, &ptot);
1299 gst_object_unref (GST_OBJECT (peer));
1301 if (gst_base_parse_convert (parse, pformat, ptot,
1302 GST_FORMAT_TIME, &dest_value)) {
1304 /* inform if duration changed, but try to avoid spamming */
1305 parse->priv->estimated_drift +=
1306 dest_value - parse->priv->estimated_duration;
1307 if (parse->priv->estimated_drift > GST_SECOND ||
1308 parse->priv->estimated_drift < -GST_SECOND) {
1309 gst_element_post_message (GST_ELEMENT (parse),
1310 gst_message_new_duration (GST_OBJECT (parse),
1311 GST_FORMAT_TIME, dest_value));
1312 parse->priv->estimated_drift = 0;
1314 parse->priv->estimated_duration = dest_value;
1315 GST_LOG_OBJECT (parse,
1316 "updated estimated duration to %" GST_TIME_FORMAT,
1317 GST_TIME_ARGS (dest_value));
1324 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1325 gboolean post_avg, gboolean post_max)
1327 GstTagList *taglist = NULL;
1329 if (post_min && parse->priv->post_min_bitrate) {
1330 taglist = gst_tag_list_new ();
1332 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1333 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1336 if (post_avg && parse->priv->post_avg_bitrate) {
1337 if (taglist == NULL)
1338 taglist = gst_tag_list_new ();
1340 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1341 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1342 parse->priv->avg_bitrate, NULL);
1345 if (post_max && parse->priv->post_max_bitrate) {
1346 if (taglist == NULL)
1347 taglist = gst_tag_list_new ();
1349 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1350 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1353 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1354 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1355 parse->priv->max_bitrate);
1357 if (taglist != NULL) {
1358 gst_element_found_tags_for_pad (GST_ELEMENT_CAST (parse), parse->srcpad,
1363 /* gst_base_parse_update_bitrates:
1364 * @parse: #GstBaseParse.
1365 * @buffer: Current frame as a #GstBuffer
1367 * Keeps track of the minimum and maximum bitrates, and also maintains a
1368 * running average bitrate of the stream so far.
1371 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1373 /* Only update the tag on a 10 kbps delta */
1374 static const gint update_threshold = 10000;
1376 guint64 data_len, frame_dur;
1377 gint overhead, frame_bitrate, old_avg_bitrate;
1378 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1379 GstBuffer *buffer = frame->buffer;
1381 overhead = frame->overhead;
1385 data_len = GST_BUFFER_SIZE (buffer) - overhead;
1386 parse->priv->data_bytecount += data_len;
1388 /* duration should be valid by now,
1389 * either set by subclass or maybe based on fps settings */
1390 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1391 /* Calculate duration of a frame from buffer properties */
1392 frame_dur = GST_BUFFER_DURATION (buffer);
1393 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1394 parse->priv->acc_duration;
1397 /* No way to figure out frame duration (is this even possible?) */
1401 /* override if subclass provided bitrate, e.g. metadata based */
1402 if (parse->priv->bitrate) {
1403 parse->priv->avg_bitrate = parse->priv->bitrate;
1404 /* spread this (confirmed) info ASAP */
1405 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1406 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1410 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1414 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1415 parse->priv->avg_bitrate);
1417 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1419 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1420 /* always post all at threshold time */
1421 update_min = update_max = update_avg = TRUE;
1424 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1425 if (frame_bitrate < parse->priv->min_bitrate) {
1426 parse->priv->min_bitrate = frame_bitrate;
1430 if (frame_bitrate > parse->priv->max_bitrate) {
1431 parse->priv->max_bitrate = frame_bitrate;
1435 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1436 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1437 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1442 if ((update_min || update_avg || update_max))
1443 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1450 * gst_base_parse_add_index_entry:
1451 * @parse: #GstBaseParse.
1452 * @offset: offset of entry
1453 * @ts: timestamp associated with offset
1454 * @key: whether entry refers to keyframe
1455 * @force: add entry disregarding sanity checks
1457 * Adds an entry to the index associating @offset to @ts. It is recommended
1458 * to only add keyframe entries. @force allows to bypass checks, such as
1459 * whether the stream is (upstream) seekable, another entry is already "close"
1460 * to the new entry, etc.
1462 * Returns: #gboolean indicating whether entry was added
1467 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1468 GstClockTime ts, gboolean key, gboolean force)
1470 gboolean ret = FALSE;
1471 GstIndexAssociation associations[2];
1473 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1474 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1476 if (G_LIKELY (!force)) {
1478 if (!parse->priv->upstream_seekable) {
1479 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1483 /* FIXME need better helper data structure that handles these issues
1484 * related to ongoing collecting of index entries */
1485 if (parse->priv->index_last_offset >= (gint64) offset) {
1486 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1487 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1491 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1492 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1493 parse->priv->idx_interval) {
1494 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1495 GST_TIME_ARGS (parse->priv->index_last_ts));
1499 /* if last is not really the last one */
1500 if (!parse->priv->index_last_valid) {
1501 GstClockTime prev_ts;
1503 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1504 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1505 GST_DEBUG_OBJECT (parse,
1506 "entry too close to existing entry %" GST_TIME_FORMAT,
1507 GST_TIME_ARGS (prev_ts));
1508 parse->priv->index_last_offset = offset;
1509 parse->priv->index_last_ts = ts;
1515 associations[0].format = GST_FORMAT_TIME;
1516 associations[0].value = ts;
1517 associations[1].format = GST_FORMAT_BYTES;
1518 associations[1].value = offset;
1520 /* index might change on-the-fly, although that would be nutty app ... */
1521 GST_BASE_PARSE_INDEX_LOCK (parse);
1522 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1523 (key) ? GST_ASSOCIATION_FLAG_KEY_UNIT : GST_ASSOCIATION_FLAG_DELTA_UNIT,
1524 2, (const GstIndexAssociation *) &associations);
1525 GST_BASE_PARSE_INDEX_UNLOCK (parse);
1528 parse->priv->index_last_offset = offset;
1529 parse->priv->index_last_ts = ts;
1538 /* check for seekable upstream, above and beyond a mere query */
1540 gst_base_parse_check_seekability (GstBaseParse * parse)
1543 gboolean seekable = FALSE;
1544 gint64 start = -1, stop = -1;
1545 guint idx_interval = 0;
1547 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1548 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1549 GST_DEBUG_OBJECT (parse, "seeking query failed");
1553 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1555 /* try harder to query upstream size if we didn't get it the first time */
1556 if (seekable && stop == -1) {
1557 GstFormat fmt = GST_FORMAT_BYTES;
1559 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1560 gst_pad_query_peer_duration (parse->sinkpad, &fmt, &stop);
1563 /* if upstream doesn't know the size, it's likely that it's not seekable in
1564 * practice even if it technically may be seekable */
1565 if (seekable && (start != 0 || stop <= start)) {
1566 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1570 /* let's not put every single frame into our index */
1572 if (stop < 10 * 1024 * 1024)
1574 else if (stop < 100 * 1024 * 1024)
1577 idx_interval = 1000;
1581 gst_query_unref (query);
1583 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1584 G_GUINT64_FORMAT ")", seekable, start, stop);
1585 parse->priv->upstream_seekable = seekable;
1586 parse->priv->upstream_size = seekable ? stop : 0;
1588 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1589 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1592 /* some misc checks on upstream */
1594 gst_base_parse_check_upstream (GstBaseParse * parse)
1596 GstFormat fmt = GST_FORMAT_TIME;
1599 if (gst_pad_query_peer_duration (parse->sinkpad, &fmt, &stop))
1600 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1601 /* upstream has one, accept it also, and no further updates */
1602 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1603 parse->priv->upstream_has_duration = TRUE;
1606 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1607 parse->priv->upstream_has_duration);
1610 /* checks src caps to determine if dealing with audio or video */
1611 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1613 gst_base_parse_check_media (GstBaseParse * parse)
1618 caps = GST_PAD_CAPS (parse->srcpad);
1619 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1620 parse->priv->is_video =
1621 g_str_has_prefix (gst_structure_get_name (s), "video");
1623 /* historical default */
1624 parse->priv->is_video = FALSE;
1627 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1630 /* takes ownership of frame */
1632 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1634 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1635 /* frame allocated on the heap, we can just take ownership */
1636 g_queue_push_tail (&parse->priv->queued_frames, frame);
1637 GST_TRACE ("queued frame %p", frame);
1639 GstBaseParseFrame *copy;
1641 /* probably allocated on the stack, must make a proper copy */
1642 copy = gst_base_parse_frame_copy (frame);
1643 g_queue_push_tail (&parse->priv->queued_frames, copy);
1644 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1645 gst_base_parse_frame_free (frame);
1649 /* gst_base_parse_handle_and_push_buffer:
1650 * @parse: #GstBaseParse.
1651 * @klass: #GstBaseParseClass.
1652 * @frame: (transfer full): a #GstBaseParseFrame
1654 * Parses the frame from given buffer and pushes it forward. Also performs
1655 * timestamp handling and checks the segment limits.
1657 * This is called with srcpad STREAM_LOCK held.
1659 * Returns: #GstFlowReturn
1661 static GstFlowReturn
1662 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1663 GstBaseParseClass * klass, GstBaseParseFrame * frame)
1669 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1671 buffer = frame->buffer;
1673 if (parse->priv->discont) {
1674 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1675 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1676 parse->priv->discont = FALSE;
1679 /* some one-time start-up */
1680 if (G_UNLIKELY (!parse->priv->framecount)) {
1681 gst_base_parse_check_seekability (parse);
1682 gst_base_parse_check_upstream (parse);
1685 GST_LOG_OBJECT (parse,
1686 "parsing frame at offset %" G_GUINT64_FORMAT
1687 " (%#" G_GINT64_MODIFIER "x) of size %d",
1688 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1689 GST_BUFFER_SIZE (buffer));
1691 /* use default handler to provide initial (upstream) metadata */
1692 gst_base_parse_parse_frame (parse, frame);
1694 /* store offset as it might get overwritten */
1695 offset = GST_BUFFER_OFFSET (buffer);
1696 ret = klass->parse_frame (parse, frame);
1698 buffer = frame->buffer;
1699 /* subclass must play nice */
1700 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1702 /* check if subclass/format can provide ts.
1703 * If so, that allows and enables extra seek and duration determining options */
1704 if (G_UNLIKELY (parse->priv->first_frame_offset < 0 && ret == GST_FLOW_OK)) {
1705 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1706 && parse->priv->pad_mode == GST_ACTIVATE_PULL) {
1707 parse->priv->first_frame_offset = offset;
1708 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1709 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1710 " for first frame at offset %" G_GINT64_FORMAT,
1711 GST_TIME_ARGS (parse->priv->first_frame_ts),
1712 parse->priv->first_frame_offset);
1713 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1715 GstClockTime last_ts = G_MAXINT64;
1717 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1718 gst_base_parse_locate_time (parse, &last_ts, &off);
1719 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1720 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1723 /* disable further checks */
1724 parse->priv->first_frame_offset = 0;
1728 /* again use default handler to add missing metadata;
1729 * we may have new information on frame properties */
1730 gst_base_parse_parse_frame (parse, frame);
1731 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1732 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1733 parse->priv->next_ts =
1734 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1736 /* we lost track, do not produce bogus time next time around
1737 * (probably means parser subclass has given up on parsing as well) */
1738 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1739 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1742 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1743 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1744 gst_base_parse_add_index_entry (parse, offset,
1745 GST_BUFFER_TIMESTAMP (buffer),
1746 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1748 /* First buffers are dropped, this means that the subclass needs more
1749 * frames to decide on the format and queues them internally */
1750 /* convert internal flow to OK and mark discont for the next buffer. */
1751 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1752 gst_base_parse_frame_free (frame);
1754 } else if (ret == GST_BASE_PARSE_FLOW_QUEUED) {
1755 gst_base_parse_queue_frame (parse, frame);
1757 } else if (ret != GST_FLOW_OK) {
1761 /* All OK, push queued frames if there are any */
1762 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1763 GstBaseParseFrame *queued_frame;
1765 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1766 queued_frame->buffer =
1767 gst_buffer_make_metadata_writable (queued_frame->buffer);
1768 gst_buffer_set_caps (queued_frame->buffer,
1769 GST_PAD_CAPS (GST_BASE_PARSE_SRC_PAD (parse)));
1770 gst_base_parse_push_frame (parse, queued_frame);
1774 return gst_base_parse_push_frame (parse, frame);
1778 * gst_base_parse_push_frame:
1779 * @parse: #GstBaseParse.
1780 * @frame: (transfer full): a #GstBaseParseFrame
1782 * Pushes the frame downstream, sends any pending events and
1783 * does some timestamp and segment handling. Takes ownership
1784 * of @frame and will clear it (if it was initialised with
1785 * gst_base_parse_frame_init()) or free it.
1787 * This must be called with sinkpad STREAM_LOCK held.
1789 * Returns: #GstFlowReturn
1794 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1796 GstFlowReturn ret = GST_FLOW_OK;
1797 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1798 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1799 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1802 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1803 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1805 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1807 buffer = frame->buffer;
1809 GST_LOG_OBJECT (parse,
1810 "processing buffer of size %d with ts %" GST_TIME_FORMAT
1811 ", duration %" GST_TIME_FORMAT, GST_BUFFER_SIZE (buffer),
1812 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1813 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1816 parse->priv->bytecount += GST_BUFFER_SIZE (buffer);
1817 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1818 parse->priv->framecount++;
1819 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1820 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1823 /* 0 means disabled */
1824 if (parse->priv->update_interval < 0)
1825 parse->priv->update_interval = 50;
1826 else if (parse->priv->update_interval > 0 &&
1827 (parse->priv->framecount % parse->priv->update_interval) == 0)
1828 gst_base_parse_update_duration (parse);
1830 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1831 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1832 if (last_start != GST_CLOCK_TIME_NONE
1833 && GST_BUFFER_DURATION_IS_VALID (buffer))
1834 last_stop = last_start + GST_BUFFER_DURATION (buffer);
1836 /* should have caps by now */
1837 g_return_val_if_fail (GST_PAD_CAPS (parse->srcpad), GST_FLOW_ERROR);
1839 /* and should then also be linked downstream, so safe to send some events */
1840 if (G_UNLIKELY (parse->priv->close_segment)) {
1841 /* only set up by loop */
1842 GST_DEBUG_OBJECT (parse, "loop sending close segment");
1843 gst_pad_push_event (parse->srcpad, parse->priv->close_segment);
1844 parse->priv->close_segment = NULL;
1846 if (G_UNLIKELY (parse->priv->pending_segment)) {
1847 GstEvent *pending_segment;
1849 pending_segment = parse->priv->pending_segment;
1850 parse->priv->pending_segment = NULL;
1852 GST_DEBUG_OBJECT (parse, "%s push pending segment",
1853 parse->priv->pad_mode == GST_ACTIVATE_PULL ? "loop" : "chain");
1854 gst_pad_push_event (parse->srcpad, pending_segment);
1856 /* have caps; check identity */
1857 gst_base_parse_check_media (parse);
1860 if (G_UNLIKELY (parse->priv->pending_events)) {
1863 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
1864 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
1866 g_list_free (parse->priv->pending_events);
1867 parse->priv->pending_events = NULL;
1870 /* segment adjustment magic; only if we are running the whole show */
1871 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
1872 (parse->priv->pad_mode == GST_ACTIVATE_PULL ||
1873 parse->priv->upstream_seekable)) {
1875 if (GST_CLOCK_TIME_IS_VALID (parse->segment.last_stop) &&
1876 GST_CLOCK_TIME_IS_VALID (last_start)) {
1877 GstClockTimeDiff diff;
1879 /* only send newsegments with increasing start times,
1880 * otherwise if these go back and forth downstream (sinks) increase
1881 * accumulated time and running_time */
1882 diff = GST_CLOCK_DIFF (parse->segment.last_stop, last_start);
1883 if (G_UNLIKELY (diff > 2 * GST_SECOND
1884 && last_start > parse->segment.start
1885 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
1886 || last_start < parse->segment.stop))) {
1887 GST_DEBUG_OBJECT (parse,
1888 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
1889 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
1890 "Sending updated NEWSEGMENT events", diff,
1891 GST_TIME_ARGS (parse->segment.last_stop),
1892 GST_TIME_ARGS (last_start));
1894 /* send newsegment events such that the gap is not accounted in
1895 * accum time, hence running_time */
1896 /* close ahead of gap */
1897 gst_pad_push_event (parse->srcpad,
1898 gst_event_new_new_segment (TRUE, parse->segment.rate,
1899 parse->segment.format, parse->segment.last_stop,
1900 parse->segment.last_stop, parse->segment.last_stop));
1902 gst_pad_push_event (parse->srcpad,
1903 gst_event_new_new_segment (FALSE, parse->segment.rate,
1904 parse->segment.format, last_start,
1905 parse->segment.stop, last_start));
1907 /* align segment view with downstream,
1908 * prevents double-counting accum when closing segment */
1909 gst_segment_set_newsegment (&parse->segment, FALSE,
1910 parse->segment.rate, parse->segment.format, last_start,
1911 parse->segment.stop, last_start);
1912 parse->segment.last_stop = last_start;
1917 /* update bitrates and optionally post corresponding tags
1918 * (following newsegment) */
1919 gst_base_parse_update_bitrates (parse, frame);
1921 if (klass->pre_push_frame) {
1922 ret = klass->pre_push_frame (parse, frame);
1924 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
1927 /* take final ownership of frame buffer */
1928 buffer = frame->buffer;
1929 frame->buffer = NULL;
1931 /* subclass must play nice */
1932 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1935 buffer = gst_buffer_make_metadata_writable (buffer);
1936 gst_buffer_set_caps (buffer, GST_PAD_CAPS (parse->srcpad));
1938 parse->priv->seen_keyframe |= parse->priv->is_video &&
1939 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
1941 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
1942 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1943 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
1944 GST_BUFFER_TIMESTAMP (buffer) >
1945 parse->segment.stop + parse->priv->lead_out_ts) {
1946 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
1947 ret = GST_FLOW_UNEXPECTED;
1948 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1949 GST_BUFFER_DURATION_IS_VALID (buffer) &&
1950 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
1951 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
1952 parse->priv->lead_in_ts < parse->segment.start) {
1953 if (parse->priv->seen_keyframe) {
1954 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
1957 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
1958 ret = GST_BASE_PARSE_FLOW_DROPPED;
1965 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1966 GST_LOG_OBJECT (parse, "frame (%d bytes) dropped",
1967 GST_BUFFER_SIZE (buffer));
1968 gst_buffer_unref (buffer);
1970 } else if (ret == GST_FLOW_OK) {
1971 if (parse->segment.rate > 0.0) {
1972 GST_LOG_OBJECT (parse, "pushing frame (%d bytes) now..",
1973 GST_BUFFER_SIZE (buffer));
1974 ret = gst_pad_push (parse->srcpad, buffer);
1975 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
1977 GST_LOG_OBJECT (parse, "frame (%d bytes) queued for now",
1978 GST_BUFFER_SIZE (buffer));
1979 parse->priv->buffers_queued =
1980 g_slist_prepend (parse->priv->buffers_queued, buffer);
1984 GST_LOG_OBJECT (parse, "frame (%d bytes) not pushed: %s",
1985 GST_BUFFER_SIZE (buffer), gst_flow_get_name (ret));
1986 gst_buffer_unref (buffer);
1987 /* if we are not sufficiently in control, let upstream decide on EOS */
1988 if (ret == GST_FLOW_UNEXPECTED &&
1989 (parse->priv->passthrough ||
1990 (parse->priv->pad_mode == GST_ACTIVATE_PUSH &&
1991 !parse->priv->upstream_seekable)))
1995 /* Update current running segment position */
1996 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
1997 parse->segment.last_stop < last_stop)
1998 gst_segment_set_last_stop (&parse->segment, GST_FORMAT_TIME, last_stop);
2000 gst_base_parse_frame_free (frame);
2006 /* gst_base_parse_drain:
2008 * Drains the adapter until it is empty. It decreases the min_frame_size to
2009 * match the current adapter size and calls chain method until the adapter
2010 * is emptied or chain returns with error.
2013 gst_base_parse_drain (GstBaseParse * parse)
2017 GST_DEBUG_OBJECT (parse, "draining");
2018 parse->priv->drain = TRUE;
2021 avail = gst_adapter_available (parse->priv->adapter);
2025 if (gst_base_parse_chain (parse->sinkpad, NULL) != GST_FLOW_OK) {
2029 /* nothing changed, maybe due to truncated frame; break infinite loop */
2030 if (avail == gst_adapter_available (parse->priv->adapter)) {
2031 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2032 gst_adapter_clear (parse->priv->adapter);
2036 parse->priv->drain = FALSE;
2039 /* gst_base_parse_send_buffers
2041 * Sends buffers collected in send_buffers downstream, and ensures that list
2042 * is empty at the end (errors or not).
2044 static GstFlowReturn
2045 gst_base_parse_send_buffers (GstBaseParse * parse)
2047 GSList *send = NULL;
2049 GstFlowReturn ret = GST_FLOW_OK;
2051 send = parse->priv->buffers_send;
2055 buf = GST_BUFFER_CAST (send->data);
2056 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
2057 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2058 ", offset %" G_GINT64_FORMAT, buf,
2059 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
2060 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2062 /* iterate output queue an push downstream */
2063 ret = gst_pad_push (parse->srcpad, buf);
2064 send = g_slist_delete_link (send, send);
2066 /* clear any leftover if error */
2067 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2069 buf = GST_BUFFER_CAST (send->data);
2070 gst_buffer_unref (buf);
2071 send = g_slist_delete_link (send, send);
2076 parse->priv->buffers_send = send;
2081 /* gst_base_parse_process_fragment:
2083 * Processes a reverse playback (forward) fragment:
2084 * - append head of last fragment that was skipped to current fragment data
2085 * - drain the resulting current fragment data (i.e. repeated chain)
2086 * - add time/duration (if needed) to frames queued by chain
2087 * - push queued data
2089 static GstFlowReturn
2090 gst_base_parse_process_fragment (GstBaseParse * parse, gboolean push_only)
2093 GstFlowReturn ret = GST_FLOW_OK;
2094 gboolean seen_key = FALSE, seen_delta = FALSE;
2100 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2101 while (parse->priv->buffers_pending) {
2102 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2103 GST_LOG_OBJECT (parse, "adding pending buffer (size %d)",
2104 GST_BUFFER_SIZE (buf));
2105 gst_adapter_push (parse->priv->adapter, buf);
2106 parse->priv->buffers_pending =
2107 g_slist_delete_link (parse->priv->buffers_pending,
2108 parse->priv->buffers_pending);
2111 /* invalidate so no fall-back timestamping is performed;
2112 * ok if taken from subclass or upstream */
2113 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2114 /* prevent it hanging around stop all the time */
2115 parse->segment.last_stop = GST_CLOCK_TIME_NONE;
2117 parse->priv->discont = TRUE;
2119 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2120 /* initial skipped data is added to buffers_pending */
2121 gst_base_parse_drain (parse);
2124 if (parse->priv->buffers_send) {
2125 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2126 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2129 /* add metadata (if needed to queued buffers */
2130 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2131 GST_TIME_ARGS (parse->priv->last_ts));
2132 while (parse->priv->buffers_queued) {
2133 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2135 /* no touching if upstream or parsing provided time */
2136 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2137 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2138 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2139 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2140 GST_BUFFER_DURATION_IS_VALID (buf)) {
2141 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2142 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2144 parse->priv->last_ts = 0;
2145 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2146 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2147 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2149 /* no idea, very bad */
2150 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2153 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2155 /* reverse order for ascending sending */
2156 /* send downstream at keyframe not preceded by a keyframe
2157 * (e.g. that should identify start of collection of IDR nals) */
2158 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2160 ret = gst_base_parse_send_buffers (parse);
2161 /* if a problem, throw all to sending */
2162 if (ret != GST_FLOW_OK) {
2163 parse->priv->buffers_send =
2164 g_slist_reverse (parse->priv->buffers_queued);
2165 parse->priv->buffers_queued = NULL;
2175 parse->priv->buffers_send =
2176 g_slist_prepend (parse->priv->buffers_send, buf);
2177 parse->priv->buffers_queued =
2178 g_slist_delete_link (parse->priv->buffers_queued,
2179 parse->priv->buffers_queued);
2182 /* audio may have all marked as keyframe, so arrange to send here */
2184 ret = gst_base_parse_send_buffers (parse);
2186 /* any trailing unused no longer usable (ideally none) */
2187 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2188 GST_DEBUG_OBJECT (parse, "discarding %d trailing bytes",
2189 gst_adapter_available (parse->priv->adapter));
2190 gst_adapter_clear (parse->priv->adapter);
2196 /* small helper that checks whether we have been trying to resync too long */
2197 static inline GstFlowReturn
2198 gst_base_parse_check_sync (GstBaseParse * parse)
2200 if (G_UNLIKELY (parse->priv->discont &&
2201 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2202 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2203 ("Failed to parse stream"), (NULL));
2204 return GST_FLOW_ERROR;
2210 static GstFlowReturn
2211 gst_base_parse_chain (GstPad * pad, GstBuffer * buffer)
2213 GstBaseParseClass *bclass;
2214 GstBaseParse *parse;
2215 GstFlowReturn ret = GST_FLOW_OK;
2216 GstBuffer *outbuf = NULL;
2217 GstBuffer *tmpbuf = NULL;
2221 guint old_min_size = 0, min_size, av;
2222 GstClockTime timestamp;
2223 GstBaseParseFrame *frame;
2225 parse = GST_BASE_PARSE (GST_OBJECT_PARENT (pad));
2226 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2228 if (parse->priv->detecting) {
2229 GstBuffer *detect_buf;
2231 if (parse->priv->detect_buffers_size == 0) {
2232 detect_buf = gst_buffer_ref (buffer);
2238 gst_buffer_new_and_alloc (parse->priv->detect_buffers_size +
2239 (buffer ? GST_BUFFER_SIZE (buffer) : 0));
2240 for (l = parse->priv->detect_buffers; l; l = l->next) {
2241 memcpy (GST_BUFFER_DATA (detect_buf) + offset,
2242 GST_BUFFER_DATA (l->data), GST_BUFFER_SIZE (l->data));
2243 offset += GST_BUFFER_SIZE (l->data);
2246 memcpy (GST_BUFFER_DATA (detect_buf) + offset, GST_BUFFER_DATA (buffer),
2247 GST_BUFFER_SIZE (buffer));
2250 ret = bclass->detect (parse, detect_buf);
2251 gst_buffer_unref (detect_buf);
2253 if (ret == GST_FLOW_OK) {
2256 /* Detected something */
2257 parse->priv->detecting = FALSE;
2259 for (l = parse->priv->detect_buffers; l; l = l->next) {
2260 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2262 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2263 GST_BUFFER_CAST (l->data));
2265 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2267 g_list_free (parse->priv->detect_buffers);
2268 parse->priv->detect_buffers = NULL;
2269 parse->priv->detect_buffers_size = 0;
2271 if (ret != GST_FLOW_OK) {
2275 /* Handle the current buffer */
2276 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2277 /* Still detecting, append buffer or error out if draining */
2279 if (parse->priv->drain) {
2280 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2281 return GST_FLOW_ERROR;
2282 } else if (parse->priv->flushing) {
2283 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2285 g_list_free (parse->priv->detect_buffers);
2286 parse->priv->detect_buffers = NULL;
2287 parse->priv->detect_buffers_size = 0;
2289 parse->priv->detect_buffers =
2290 g_list_append (parse->priv->detect_buffers, buffer);
2291 parse->priv->detect_buffers_size += GST_BUFFER_SIZE (buffer);
2295 /* Something went wrong, subclass responsible for error reporting */
2299 /* And now handle the current buffer if detection worked */
2302 frame = &parse->priv->frame;
2304 if (G_LIKELY (buffer)) {
2305 GST_LOG_OBJECT (parse, "buffer size: %d, offset = %" G_GINT64_FORMAT,
2306 GST_BUFFER_SIZE (buffer), GST_BUFFER_OFFSET (buffer));
2307 if (G_UNLIKELY (parse->priv->passthrough)) {
2308 gst_base_parse_frame_init (frame);
2309 frame->buffer = gst_buffer_make_metadata_writable (buffer);
2310 return gst_base_parse_push_frame (parse, frame);
2312 /* upstream feeding us in reverse playback;
2313 * gather each fragment, then process it in single run */
2314 if (parse->segment.rate < 0.0) {
2315 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2316 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2317 ret = gst_base_parse_process_fragment (parse, FALSE);
2319 gst_adapter_push (parse->priv->adapter, buffer);
2322 gst_adapter_push (parse->priv->adapter, buffer);
2325 if (G_UNLIKELY (buffer &&
2326 GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2327 frame->_private_flags |= GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
2328 gst_base_parse_frame_free (frame);
2331 /* Parse and push as many frames as possible */
2332 /* Stop either when adapter is empty or we are flushing */
2333 while (!parse->priv->flushing) {
2336 /* maintain frame state for a single frame parsing round across _chain calls,
2337 * so only init when needed */
2338 if (!frame->_private_flags)
2339 gst_base_parse_frame_init (frame);
2341 tmpbuf = gst_buffer_new ();
2344 /* Synchronization loop */
2346 /* note: if subclass indicates MAX fsize,
2347 * this will not likely be available anyway ... */
2348 min_size = MAX (parse->priv->min_frame_size, fsize);
2349 av = gst_adapter_available (parse->priv->adapter);
2351 /* loop safety check */
2352 if (G_UNLIKELY (old_min_size >= min_size))
2354 old_min_size = min_size;
2356 if (G_UNLIKELY (parse->priv->drain)) {
2358 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2359 if (G_UNLIKELY (!min_size)) {
2360 gst_buffer_unref (tmpbuf);
2365 /* Collect at least min_frame_size bytes */
2366 if (av < min_size) {
2367 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)",
2369 gst_buffer_unref (tmpbuf);
2373 /* always pass all available data */
2374 data = gst_adapter_peek (parse->priv->adapter, av);
2375 GST_BUFFER_DATA (tmpbuf) = (guint8 *) data;
2376 GST_BUFFER_SIZE (tmpbuf) = av;
2377 GST_BUFFER_OFFSET (tmpbuf) = parse->priv->offset;
2378 GST_BUFFER_FLAG_SET (tmpbuf, GST_MINI_OBJECT_FLAG_READONLY);
2380 if (parse->priv->discont) {
2381 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2382 GST_BUFFER_FLAG_SET (tmpbuf, GST_BUFFER_FLAG_DISCONT);
2386 gst_base_parse_frame_update (parse, frame, tmpbuf);
2387 res = bclass->check_valid_frame (parse, frame, &fsize, &skip);
2388 gst_buffer_replace (&frame->buffer, NULL);
2390 if (gst_adapter_available (parse->priv->adapter) < fsize) {
2391 GST_DEBUG_OBJECT (parse,
2392 "found valid frame but not enough data available (only %d bytes)",
2393 gst_adapter_available (parse->priv->adapter));
2394 gst_buffer_unref (tmpbuf);
2397 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2401 /* subclass didn't touch this value. By default we skip 1 byte */
2405 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2406 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2407 /* reverse playback, and no frames found yet, so we are skipping
2408 * the leading part of a fragment, which may form the tail of
2409 * fragment coming later, hopefully subclass skips efficiently ... */
2410 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2411 outbuf = gst_adapter_take_buffer (parse->priv->adapter, skip);
2412 outbuf = gst_buffer_make_metadata_writable (outbuf);
2413 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
2414 parse->priv->buffers_pending =
2415 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2418 gst_adapter_flush (parse->priv->adapter, skip);
2420 parse->priv->offset += skip;
2421 if (!parse->priv->discont)
2422 parse->priv->sync_offset = parse->priv->offset;
2423 parse->priv->discont = TRUE;
2424 /* something changed least; nullify loop check */
2427 /* skip == 0 should imply subclass set min_size to need more data;
2428 * we check this shortly */
2429 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2430 gst_buffer_unref (tmpbuf);
2434 gst_buffer_unref (tmpbuf);
2438 /* Subclass found the sync, but still wants to skip some data */
2439 GST_LOG_OBJECT (parse, "skipping %d bytes", skip);
2440 gst_adapter_flush (parse->priv->adapter, skip);
2441 parse->priv->offset += skip;
2444 /* Grab lock to prevent a race with FLUSH_START handler */
2445 GST_PAD_STREAM_LOCK (parse->srcpad);
2447 /* FLUSH_START event causes the "flushing" flag to be set. In this
2448 * case we can leave the frame pushing loop */
2449 if (parse->priv->flushing) {
2450 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2454 /* move along with upstream timestamp (if any),
2455 * but interpolate in between */
2456 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2457 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2458 (parse->priv->prev_ts != timestamp)) {
2459 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2462 /* FIXME: Would it be more efficient to make a subbuffer instead? */
2463 outbuf = gst_adapter_take_buffer (parse->priv->adapter, fsize);
2464 outbuf = gst_buffer_make_metadata_writable (outbuf);
2466 /* Subclass may want to know the data offset */
2467 GST_BUFFER_OFFSET (outbuf) = parse->priv->offset;
2468 parse->priv->offset += fsize;
2469 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2470 GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
2472 frame->buffer = outbuf;
2473 ret = gst_base_parse_handle_and_push_frame (parse, bclass, frame);
2474 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2476 if (ret != GST_FLOW_OK) {
2477 GST_LOG_OBJECT (parse, "push returned %d", ret);
2483 GST_LOG_OBJECT (parse, "chain leaving");
2489 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2490 ("min_size evolution %d -> %d; breaking to avoid looping",
2491 old_min_size, min_size));
2492 return GST_FLOW_ERROR;
2496 /* pull @size bytes at current offset,
2497 * i.e. at least try to and possibly return a shorter buffer if near the end */
2498 static GstFlowReturn
2499 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2500 GstBuffer ** buffer)
2502 GstFlowReturn ret = GST_FLOW_OK;
2504 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2506 /* Caching here actually makes much less difference than one would expect.
2507 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2508 if (parse->priv->cache) {
2509 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2510 gint cache_size = GST_BUFFER_SIZE (parse->priv->cache);
2512 if (cache_offset <= parse->priv->offset &&
2513 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2514 *buffer = gst_buffer_create_sub (parse->priv->cache,
2515 parse->priv->offset - cache_offset, size);
2516 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2519 /* not enough data in the cache, free cache and get a new one */
2520 gst_buffer_unref (parse->priv->cache);
2521 parse->priv->cache = NULL;
2524 /* refill the cache */
2526 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2527 64 * 1024), &parse->priv->cache);
2528 if (ret != GST_FLOW_OK) {
2529 parse->priv->cache = NULL;
2533 if (GST_BUFFER_SIZE (parse->priv->cache) >= size) {
2534 *buffer = gst_buffer_create_sub (parse->priv->cache, 0, size);
2535 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2539 /* Not possible to get enough data, try a last time with
2540 * requesting exactly the size we need */
2541 gst_buffer_unref (parse->priv->cache);
2542 parse->priv->cache = NULL;
2544 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2545 &parse->priv->cache);
2547 if (ret != GST_FLOW_OK) {
2548 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2553 if (GST_BUFFER_SIZE (parse->priv->cache) < size) {
2554 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2555 G_GUINT64_FORMAT ": wanted %u bytes, got %u bytes", parse->priv->offset,
2556 size, GST_BUFFER_SIZE (parse->priv->cache));
2558 *buffer = parse->priv->cache;
2559 parse->priv->cache = NULL;
2564 *buffer = gst_buffer_create_sub (parse->priv->cache, 0, size);
2565 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2570 static GstFlowReturn
2571 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2574 GstClockTime ts = 0;
2578 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2579 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2580 parse->priv->last_offset);
2582 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2583 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2584 GST_TIME_ARGS (parse->segment.start));
2585 ret = GST_FLOW_UNEXPECTED;
2589 /* last fragment started at last_offset / last_ts;
2590 * seek back 10s capped at 1MB */
2591 if (parse->priv->last_ts >= 10 * GST_SECOND)
2592 ts = parse->priv->last_ts - 10 * GST_SECOND;
2593 /* if we are exact now, we will be more so going backwards */
2594 if (parse->priv->exact_position) {
2595 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2597 GstFormat dstformat = GST_FORMAT_BYTES;
2599 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2600 &dstformat, &offset)) {
2601 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2604 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2605 parse->priv->last_offset - 1024);
2606 offset = MAX (0, offset);
2608 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2610 parse->priv->offset = offset;
2612 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2614 if (ret != GST_FLOW_OK)
2617 /* offset will increase again as fragment is processed/parsed */
2618 parse->priv->last_offset = offset;
2620 gst_adapter_push (parse->priv->adapter, buffer);
2621 ret = gst_base_parse_process_fragment (parse, FALSE);
2622 if (ret != GST_FLOW_OK)
2625 /* force previous fragment */
2626 parse->priv->offset = -1;
2633 * pull and scan for next frame starting from current offset
2634 * ajusts sync, drain and offset going along */
2635 static GstFlowReturn
2636 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2637 GstBaseParseFrame * frame, gboolean full)
2639 GstBuffer *buffer, *outbuf;
2640 GstFlowReturn ret = GST_FLOW_OK;
2641 guint fsize = 1, min_size, old_min_size = 0;
2644 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2646 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2647 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2649 /* let's make this efficient for all subclass once and for all;
2650 * maybe it does not need this much, but in the latter case, we know we are
2651 * in pull mode here and might as well try to read and supply more anyway
2652 * (so does the buffer caching mechanism) */
2658 min_size = MAX (parse->priv->min_frame_size, fsize);
2659 /* loop safety check */
2660 if (G_UNLIKELY (old_min_size >= min_size))
2662 old_min_size = min_size;
2664 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2665 if (ret != GST_FLOW_OK)
2668 if (parse->priv->discont) {
2669 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2670 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
2673 /* if we got a short read, inform subclass we are draining leftover
2674 * and no more is to be expected */
2675 if (GST_BUFFER_SIZE (buffer) < min_size)
2676 parse->priv->drain = TRUE;
2678 if (parse->priv->detecting) {
2679 ret = klass->detect (parse, buffer);
2680 if (ret == GST_FLOW_NOT_NEGOTIATED) {
2681 /* If draining we error out, otherwise request a buffer
2683 if (parse->priv->drain) {
2684 gst_buffer_unref (buffer);
2685 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
2686 return GST_FLOW_ERROR;
2689 gst_buffer_unref (buffer);
2692 } else if (ret != GST_FLOW_OK) {
2693 gst_buffer_unref (buffer);
2694 GST_ERROR_OBJECT (parse, "detect() returned %s",
2695 gst_flow_get_name (ret));
2699 /* Else handle this buffer normally */
2703 gst_base_parse_frame_update (parse, frame, buffer);
2704 res = klass->check_valid_frame (parse, frame, &fsize, &skip);
2705 gst_buffer_replace (&frame->buffer, NULL);
2707 parse->priv->drain = FALSE;
2708 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2711 parse->priv->drain = FALSE;
2715 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2716 if (full && parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2717 /* reverse playback, and no frames found yet, so we are skipping
2718 * the leading part of a fragment, which may form the tail of
2719 * fragment coming later, hopefully subclass skips efficiently ... */
2720 outbuf = gst_buffer_create_sub (buffer, 0, skip);
2721 parse->priv->buffers_pending =
2722 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2725 parse->priv->offset += skip;
2726 if (!parse->priv->discont)
2727 parse->priv->sync_offset = parse->priv->offset;
2728 parse->priv->discont = TRUE;
2729 /* something changed at least; nullify loop check */
2730 if (fsize == G_MAXUINT)
2731 fsize = old_min_size + 64 * 1024;
2734 /* skip == 0 should imply subclass set min_size to need more data;
2735 * we check this shortly */
2736 GST_DEBUG_OBJECT (parse, "finding sync...");
2737 gst_buffer_unref (buffer);
2738 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2743 /* Does the subclass want to skip too? */
2745 parse->priv->offset += skip;
2749 if (fsize + skip <= GST_BUFFER_SIZE (buffer)) {
2750 outbuf = gst_buffer_create_sub (buffer, skip, fsize);
2751 GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer) + skip;
2752 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2753 gst_buffer_unref (buffer);
2755 gst_buffer_unref (buffer);
2756 ret = gst_base_parse_pull_range (parse, fsize, &outbuf);
2757 if (ret != GST_FLOW_OK)
2759 if (GST_BUFFER_SIZE (outbuf) < fsize) {
2760 gst_buffer_unref (outbuf);
2761 ret = GST_FLOW_UNEXPECTED;
2765 parse->priv->offset += fsize;
2767 frame->buffer = outbuf;
2775 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2776 ("min_size evolution %d -> %d; breaking to avoid looping",
2777 old_min_size, min_size));
2778 return GST_FLOW_ERROR;
2782 /* Loop that is used in pull mode to retrieve data from upstream */
2784 gst_base_parse_loop (GstPad * pad)
2786 GstBaseParse *parse;
2787 GstBaseParseClass *klass;
2788 GstFlowReturn ret = GST_FLOW_OK;
2789 GstBaseParseFrame frame;
2791 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2792 klass = GST_BASE_PARSE_GET_CLASS (parse);
2794 /* reverse playback:
2795 * first fragment (closest to stop time) is handled normally below,
2796 * then we pull in fragments going backwards */
2797 if (parse->segment.rate < 0.0) {
2798 /* check if we jumped back to a previous fragment,
2799 * which is a post-first fragment */
2800 if (parse->priv->offset < 0) {
2801 ret = gst_base_parse_handle_previous_fragment (parse);
2806 gst_base_parse_frame_init (&frame);
2807 ret = gst_base_parse_scan_frame (parse, klass, &frame, TRUE);
2808 if (ret != GST_FLOW_OK)
2811 /* This always cleans up frame, even if error occurs */
2812 ret = gst_base_parse_handle_and_push_frame (parse, klass, &frame);
2814 /* eat expected eos signalling past segment in reverse playback */
2815 if (parse->segment.rate < 0.0 && ret == GST_FLOW_UNEXPECTED &&
2816 parse->segment.last_stop >= parse->segment.stop) {
2817 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2818 /* push what was accumulated during loop run */
2819 gst_base_parse_process_fragment (parse, TRUE);
2820 /* force previous fragment */
2821 parse->priv->offset = -1;
2826 if (ret == GST_FLOW_UNEXPECTED)
2828 else if (ret != GST_FLOW_OK)
2831 gst_object_unref (parse);
2837 ret = GST_FLOW_UNEXPECTED;
2838 GST_DEBUG_OBJECT (parse, "eos");
2843 gboolean push_eos = FALSE;
2845 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2846 gst_flow_get_name (ret));
2847 gst_pad_pause_task (parse->sinkpad);
2849 if (ret == GST_FLOW_UNEXPECTED) {
2850 /* handle end-of-stream/segment */
2851 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2854 if ((stop = parse->segment.stop) == -1)
2855 stop = parse->segment.duration;
2857 GST_DEBUG_OBJECT (parse, "sending segment_done");
2859 gst_element_post_message
2860 (GST_ELEMENT_CAST (parse),
2861 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2862 GST_FORMAT_TIME, stop));
2864 /* If we STILL have zero frames processed, fire an error */
2865 if (parse->priv->framecount == 0) {
2866 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2867 ("No valid frames found before end of stream"), (NULL));
2871 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_UNEXPECTED) {
2872 /* for fatal errors we post an error message, wrong-state is
2873 * not fatal because it happens due to flushes and only means
2874 * that we should stop now. */
2875 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2876 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
2880 /* newsegment before eos */
2881 if (parse->priv->pending_segment) {
2882 gst_pad_push_event (parse->srcpad, parse->priv->pending_segment);
2883 parse->priv->pending_segment = NULL;
2885 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
2887 gst_object_unref (parse);
2892 gst_base_parse_sink_activate (GstPad * sinkpad)
2894 GstBaseParse *parse;
2895 gboolean result = TRUE;
2897 parse = GST_BASE_PARSE (gst_pad_get_parent (sinkpad));
2899 GST_DEBUG_OBJECT (parse, "sink activate");
2901 if (gst_pad_check_pull_range (sinkpad)) {
2902 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
2903 result = gst_pad_activate_pull (sinkpad, TRUE);
2905 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
2906 result = gst_pad_activate_push (sinkpad, TRUE);
2909 GST_DEBUG_OBJECT (parse, "sink activate return %d", result);
2910 gst_object_unref (parse);
2915 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
2917 GstBaseParseClass *klass;
2918 gboolean result = TRUE;
2920 GST_DEBUG_OBJECT (parse, "activate %d", active);
2922 klass = GST_BASE_PARSE_GET_CLASS (parse);
2925 if (parse->priv->pad_mode == GST_ACTIVATE_NONE && klass->start)
2926 result = klass->start (parse);
2928 /* If the subclass implements ::detect we want to
2929 * call it for the first buffers now */
2930 parse->priv->detecting = (klass->detect != NULL);
2932 /* We must make sure streaming has finished before resetting things
2933 * and calling the ::stop vfunc */
2934 GST_PAD_STREAM_LOCK (parse->sinkpad);
2935 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
2937 if (parse->priv->pad_mode != GST_ACTIVATE_NONE && klass->stop)
2938 result = klass->stop (parse);
2940 parse->priv->pad_mode = GST_ACTIVATE_NONE;
2942 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
2947 gst_base_parse_sink_activate_push (GstPad * pad, gboolean active)
2949 gboolean result = TRUE;
2950 GstBaseParse *parse;
2952 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2954 GST_DEBUG_OBJECT (parse, "sink activate push %d", active);
2956 result = gst_base_parse_activate (parse, active);
2959 parse->priv->pad_mode = active ? GST_ACTIVATE_PUSH : GST_ACTIVATE_NONE;
2961 GST_DEBUG_OBJECT (parse, "sink activate push return: %d", result);
2963 gst_object_unref (parse);
2968 gst_base_parse_sink_activate_pull (GstPad * sinkpad, gboolean active)
2970 gboolean result = FALSE;
2971 GstBaseParse *parse;
2973 parse = GST_BASE_PARSE (gst_pad_get_parent (sinkpad));
2975 GST_DEBUG_OBJECT (parse, "activate pull %d", active);
2977 result = gst_base_parse_activate (parse, active);
2981 parse->priv->pending_segment = gst_event_new_new_segment (FALSE,
2982 parse->segment.rate, parse->segment.format,
2983 parse->segment.start, parse->segment.stop, parse->segment.last_stop);
2985 gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop,
2988 result &= gst_pad_stop_task (sinkpad);
2993 parse->priv->pad_mode = active ? GST_ACTIVATE_PULL : GST_ACTIVATE_NONE;
2995 GST_DEBUG_OBJECT (parse, "sink activate pull return: %d", result);
2997 gst_object_unref (parse);
3003 * gst_base_parse_set_duration:
3004 * @parse: #GstBaseParse.
3006 * @duration: duration value.
3007 * @interval: how often to update the duration estimate based on bitrate, or 0.
3009 * Sets the duration of the currently playing media. Subclass can use this
3010 * when it is able to determine duration and/or notices a change in the media
3011 * duration. Alternatively, if @interval is non-zero (default), then stream
3012 * duration is determined based on estimated bitrate, and updated every @interval
3018 gst_base_parse_set_duration (GstBaseParse * parse,
3019 GstFormat fmt, gint64 duration, gint interval)
3021 g_return_if_fail (parse != NULL);
3023 if (parse->priv->upstream_has_duration) {
3024 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3028 if (duration != parse->priv->duration) {
3031 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
3032 gst_element_post_message (GST_ELEMENT (parse), m);
3034 /* TODO: what about duration tag? */
3036 parse->priv->duration = duration;
3037 parse->priv->duration_fmt = fmt;
3038 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3039 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3040 if (interval != 0) {
3041 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3045 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3046 parse->priv->update_interval = interval;
3052 * gst_base_parse_set_average_bitrate:
3053 * @parse: #GstBaseParse.
3054 * @bitrate: average bitrate in bits/second
3056 * Optionally sets the average bitrate detected in media (if non-zero),
3057 * e.g. based on metadata, as it will be posted to the application.
3059 * By default, announced average bitrate is estimated. The average bitrate
3060 * is used to estimate the total duration of the stream and to estimate
3061 * a seek position, if there's no index and the format is syncable
3062 * (see gst_base_parse_set_syncable()).
3067 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3069 parse->priv->bitrate = bitrate;
3070 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3074 * gst_base_parse_set_min_frame_size:
3075 * @parse: #GstBaseParse.
3076 * @min_size: Minimum size of the data that this base class should give to
3079 * Subclass can use this function to tell the base class that it needs to
3080 * give at least #min_size buffers.
3085 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3087 g_return_if_fail (parse != NULL);
3089 parse->priv->min_frame_size = min_size;
3090 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3094 * gst_base_parse_set_frame_rate:
3095 * @parse: the #GstBaseParse to set
3096 * @fps_num: frames per second (numerator).
3097 * @fps_den: frames per second (denominator).
3098 * @lead_in: frames needed before a segment for subsequent decode
3099 * @lead_out: frames needed after a segment
3101 * If frames per second is configured, parser can take care of buffer duration
3102 * and timestamping. When performing segment clipping, or seeking to a specific
3103 * location, a corresponding decoder might need an initial @lead_in and a
3104 * following @lead_out number of frames to ensure the desired segment is
3105 * entirely filled upon decoding.
3110 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3111 guint fps_den, guint lead_in, guint lead_out)
3113 g_return_if_fail (parse != NULL);
3115 parse->priv->fps_num = fps_num;
3116 parse->priv->fps_den = fps_den;
3117 if (!fps_num || !fps_den) {
3118 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3120 fps_num = fps_den = 0;
3121 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3122 parse->priv->lead_in = parse->priv->lead_out = 0;
3123 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3125 parse->priv->frame_duration =
3126 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3127 parse->priv->lead_in = lead_in;
3128 parse->priv->lead_out = lead_out;
3129 parse->priv->lead_in_ts =
3130 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3131 parse->priv->lead_out_ts =
3132 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3133 /* aim for about 1.5s to estimate duration */
3134 if (parse->priv->update_interval < 0) {
3135 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3136 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3137 parse->priv->update_interval);
3140 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3141 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3142 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3143 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3144 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3145 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3149 * gst_base_parse_set_has_timing_info:
3150 * @parse: a #GstBaseParse
3151 * @has_timing: whether frames carry timing information
3153 * Set if frames carry timing information which the subclass can (generally)
3154 * parse and provide. In particular, intrinsic (rather than estimated) time
3155 * can be obtained following a seek.
3160 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3162 parse->priv->has_timing_info = has_timing;
3163 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3167 * gst_base_parse_set_syncable:
3168 * @parse: a #GstBaseParse
3169 * @syncable: set if frame starts can be identified
3171 * Set if frame starts can be identified. This is set by default and
3172 * determines whether seeking based on bitrate averages
3173 * is possible for a format/stream.
3178 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3180 parse->priv->syncable = syncable;
3181 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3185 * gst_base_parse_set_passthrough:
3186 * @parse: a #GstBaseParse
3187 * @passthrough: %TRUE if parser should run in passthrough mode
3189 * Set if the nature of the format or configuration does not allow (much)
3190 * parsing, and the parser should operate in passthrough mode (which only
3191 * applies when operating in push mode). That is, incoming buffers are
3192 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3193 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3194 * so subclass can perform as much or as little is appropriate for
3195 * passthrough semantics in @pre_push_frame.
3200 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3202 parse->priv->passthrough = passthrough;
3203 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3207 * gst_base_parse_set_latency:
3208 * @parse: a #GstBaseParse
3209 * @min_latency: minimum parse latency
3210 * @max_latency: maximum parse latency
3212 * Sets the minimum and maximum (which may likely be equal) latency introduced
3213 * by the parsing process. If there is such a latency, which depends on the
3214 * particular parsing of the format, it typically corresponds to 1 frame duration.
3219 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3220 GstClockTime max_latency)
3222 GST_OBJECT_LOCK (parse);
3223 parse->priv->min_latency = min_latency;
3224 parse->priv->max_latency = max_latency;
3225 GST_OBJECT_UNLOCK (parse);
3226 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3227 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3228 GST_TIME_ARGS (max_latency));
3232 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3233 GstClockTime * duration)
3235 gboolean res = FALSE;
3237 g_return_val_if_fail (duration != NULL, FALSE);
3239 *duration = GST_CLOCK_TIME_NONE;
3240 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3241 GST_LOG_OBJECT (parse, "using provided duration");
3242 *duration = parse->priv->duration;
3244 } else if (parse->priv->duration != -1) {
3245 GST_LOG_OBJECT (parse, "converting provided duration");
3246 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3247 parse->priv->duration, format, (gint64 *) duration);
3248 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3249 GST_LOG_OBJECT (parse, "using estimated duration");
3250 *duration = parse->priv->estimated_duration;
3254 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3255 GST_TIME_ARGS (*duration));
3259 static const GstQueryType *
3260 gst_base_parse_get_querytypes (GstPad * pad)
3262 static const GstQueryType list[] = {
3275 gst_base_parse_query (GstPad * pad, GstQuery * query)
3277 GstBaseParse *parse;
3278 gboolean res = FALSE;
3280 parse = GST_BASE_PARSE (GST_PAD_PARENT (pad));
3282 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3284 switch (GST_QUERY_TYPE (query)) {
3285 case GST_QUERY_POSITION:
3290 GST_DEBUG_OBJECT (parse, "position query");
3291 gst_query_parse_position (query, &format, NULL);
3293 /* try upstream first */
3294 res = gst_pad_query_default (pad, query);
3296 /* Fall back on interpreting segment */
3297 GST_OBJECT_LOCK (parse);
3298 if (format == GST_FORMAT_BYTES) {
3299 dest_value = parse->priv->offset;
3301 } else if (format == parse->segment.format &&
3302 GST_CLOCK_TIME_IS_VALID (parse->segment.last_stop)) {
3303 dest_value = gst_segment_to_stream_time (&parse->segment,
3304 parse->segment.format, parse->segment.last_stop);
3307 GST_OBJECT_UNLOCK (parse);
3309 /* no precise result, upstream no idea either, then best estimate */
3310 /* priv->offset is updated in both PUSH/PULL modes */
3311 res = gst_base_parse_convert (parse,
3312 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3315 gst_query_set_position (query, format, dest_value);
3319 case GST_QUERY_DURATION:
3322 GstClockTime duration;
3324 GST_DEBUG_OBJECT (parse, "duration query");
3325 gst_query_parse_duration (query, &format, NULL);
3327 /* consult upstream */
3328 res = gst_pad_query_default (pad, query);
3330 /* otherwise best estimate from us */
3332 res = gst_base_parse_get_duration (parse, format, &duration);
3334 gst_query_set_duration (query, format, duration);
3338 case GST_QUERY_SEEKING:
3341 GstClockTime duration = GST_CLOCK_TIME_NONE;
3342 gboolean seekable = FALSE;
3344 GST_DEBUG_OBJECT (parse, "seeking query");
3345 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3347 /* consult upstream */
3348 res = gst_pad_query_default (pad, query);
3350 /* we may be able to help if in TIME */
3351 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3352 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3353 /* already OK if upstream takes care */
3354 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3356 if (!(res && seekable)) {
3357 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3358 || duration == -1) {
3359 /* seekable if we still have a chance to get duration later on */
3361 parse->priv->upstream_seekable && parse->priv->update_interval;
3363 seekable = parse->priv->upstream_seekable;
3364 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3367 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3373 case GST_QUERY_FORMATS:
3374 gst_query_set_formatsv (query, 3, fmtlist);
3377 case GST_QUERY_CONVERT:
3379 GstFormat src_format, dest_format;
3380 gint64 src_value, dest_value;
3382 gst_query_parse_convert (query, &src_format, &src_value,
3383 &dest_format, &dest_value);
3385 res = gst_base_parse_convert (parse, src_format, src_value,
3386 dest_format, &dest_value);
3388 gst_query_set_convert (query, src_format, src_value,
3389 dest_format, dest_value);
3393 case GST_QUERY_LATENCY:
3395 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3397 GstClockTime min_latency, max_latency;
3399 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3400 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3401 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3402 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3404 GST_OBJECT_LOCK (parse);
3405 /* add our latency */
3406 if (min_latency != -1)
3407 min_latency += parse->priv->min_latency;
3408 if (max_latency != -1)
3409 max_latency += parse->priv->max_latency;
3410 GST_OBJECT_UNLOCK (parse);
3412 gst_query_set_latency (query, live, min_latency, max_latency);
3417 res = gst_pad_query_default (pad, query);
3423 /* scans for a cluster start from @pos,
3424 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3425 static GstFlowReturn
3426 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3427 GstClockTime * time, GstClockTime * duration)
3429 GstBaseParseClass *klass;
3431 gboolean orig_drain, orig_discont;
3432 GstFlowReturn ret = GST_FLOW_OK;
3433 GstBuffer *buf = NULL;
3434 GstBaseParseFrame frame;
3436 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3437 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3438 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3440 klass = GST_BASE_PARSE_GET_CLASS (parse);
3442 *time = GST_CLOCK_TIME_NONE;
3443 *duration = GST_CLOCK_TIME_NONE;
3446 orig_offset = parse->priv->offset;
3447 orig_discont = parse->priv->discont;
3448 orig_drain = parse->priv->drain;
3450 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3451 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3453 gst_base_parse_frame_init (&frame);
3455 /* jump elsewhere and locate next frame */
3456 parse->priv->offset = *pos;
3457 ret = gst_base_parse_scan_frame (parse, klass, &frame, FALSE);
3458 if (ret != GST_FLOW_OK)
3462 GST_LOG_OBJECT (parse,
3463 "peek parsing frame at offset %" G_GUINT64_FORMAT
3464 " (%#" G_GINT64_MODIFIER "x) of size %d",
3465 GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET (buf), GST_BUFFER_SIZE (buf));
3467 /* get offset first, subclass parsing might dump other stuff in there */
3468 *pos = GST_BUFFER_OFFSET (buf);
3469 ret = klass->parse_frame (parse, &frame);
3472 /* but it should provide proper time */
3473 *time = GST_BUFFER_TIMESTAMP (buf);
3474 *duration = GST_BUFFER_DURATION (buf);
3476 gst_base_parse_frame_free (&frame);
3478 GST_LOG_OBJECT (parse,
3479 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3480 GST_TIME_ARGS (*time), *pos);
3484 parse->priv->offset = orig_offset;
3485 parse->priv->discont = orig_discont;
3486 parse->priv->drain = orig_drain;
3491 /* bisect and scan through file for frame starting before @time,
3492 * returns OK and @time/@offset if found, NONE and/or error otherwise
3493 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3494 static GstFlowReturn
3495 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3498 GstFlowReturn ret = GST_FLOW_OK;
3499 gint64 lpos, hpos, newpos;
3500 GstClockTime time, ltime, htime, newtime, dur;
3501 gboolean cont = TRUE;
3502 const GstClockTime tolerance = TARGET_DIFFERENCE;
3503 const guint chunk = 4 * 1024;
3505 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3506 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3508 GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
3509 GST_TIME_ARGS (*_time));
3511 /* TODO also make keyframe aware if useful some day */
3526 /* do not know at first */
3528 *_time = GST_CLOCK_TIME_NONE;
3530 /* need initial positions; start and end */
3531 lpos = parse->priv->first_frame_offset;
3532 ltime = parse->priv->first_frame_ts;
3533 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
3534 GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
3535 return GST_FLOW_ERROR;
3537 hpos = parse->priv->upstream_size;
3539 GST_DEBUG_OBJECT (parse,
3540 "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
3541 ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, htime,
3542 GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
3544 /* check preconditions are satisfied;
3545 * start and end are needed, except for special case where we scan for
3546 * last frame to determine duration */
3547 if (parse->priv->pad_mode != GST_ACTIVATE_PULL || !hpos ||
3548 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3549 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3553 /* shortcut cases */
3556 } else if (time < ltime + tolerance) {
3560 } else if (time >= htime) {
3566 while (htime > ltime && cont) {
3567 GST_LOG_OBJECT (parse,
3568 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3569 GST_TIME_ARGS (ltime));
3570 GST_LOG_OBJECT (parse,
3571 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3572 GST_TIME_ARGS (htime));
3573 if (G_UNLIKELY (time == G_MAXINT64)) {
3575 } else if (G_LIKELY (hpos > lpos)) {
3577 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3580 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3582 /* we check this case once, but not forever, so break loop */
3587 newpos = CLAMP (newpos, lpos, hpos);
3588 GST_LOG_OBJECT (parse,
3589 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3590 GST_TIME_ARGS (time), newpos);
3592 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3593 if (ret == GST_FLOW_UNEXPECTED) {
3594 /* heuristic HACK */
3595 hpos = MAX (lpos, hpos - chunk);
3597 } else if (ret != GST_FLOW_OK) {
3601 if (newtime == -1 || newpos == -1) {
3602 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3606 if (G_UNLIKELY (time == G_MAXINT64)) {
3609 if (GST_CLOCK_TIME_IS_VALID (dur))
3612 } else if (newtime > time) {
3614 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3616 } else if (newtime + tolerance > time) {
3617 /* close enough undershoot */
3621 } else if (newtime < ltime) {
3622 /* so a position beyond lpos resulted in earlier time than ltime ... */
3623 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3626 /* undershoot too far */
3627 newpos += newpos == lpos ? chunk : 0;
3628 lpos = CLAMP (newpos, lpos, hpos);
3634 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3635 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3640 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3641 gboolean before, GstClockTime * _ts)
3643 gint64 bytes = 0, ts = 0;
3644 GstIndexEntry *entry = NULL;
3646 if (time == GST_CLOCK_TIME_NONE) {
3652 GST_BASE_PARSE_INDEX_LOCK (parse);
3653 if (parse->priv->index) {
3654 /* Let's check if we have an index entry for that time */
3655 entry = gst_index_get_assoc_entry (parse->priv->index,
3656 parse->priv->index_id,
3657 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3658 GST_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3662 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3663 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3665 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3666 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3667 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3669 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3670 GST_TIME_ARGS (time));
3673 ts = GST_CLOCK_TIME_NONE;
3676 GST_BASE_PARSE_INDEX_UNLOCK (parse);
3685 /* returns TRUE if seek succeeded */
3687 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3692 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3693 gboolean flush, update, res = TRUE, accurate;
3694 gint64 cur, stop, seekpos, seekstop;
3695 GstSegment seeksegment = { 0, };
3696 GstFormat dstformat;
3697 GstClockTime start_ts;
3699 gst_event_parse_seek (event, &rate, &format, &flags,
3700 &cur_type, &cur, &stop_type, &stop);
3702 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3703 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3704 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3705 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3707 /* no negative rates in push mode */
3708 if (rate < 0.0 && parse->priv->pad_mode == GST_ACTIVATE_PUSH)
3711 if (cur_type != GST_SEEK_TYPE_SET ||
3712 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3715 /* For any format other than TIME, see if upstream handles
3716 * it directly or fail. For TIME, try upstream, but do it ourselves if
3717 * it fails upstream */
3718 if (format != GST_FORMAT_TIME) {
3719 /* default action delegates to upstream */
3723 gst_event_ref (event);
3724 if ((res = gst_pad_push_event (parse->sinkpad, event))) {
3729 /* get flush flag */
3730 flush = flags & GST_SEEK_FLAG_FLUSH;
3732 /* copy segment, we need this because we still need the old
3733 * segment when we close the current segment. */
3734 memcpy (&seeksegment, &parse->segment, sizeof (GstSegment));
3736 GST_DEBUG_OBJECT (parse, "configuring seek");
3737 gst_segment_set_seek (&seeksegment, rate, format, flags,
3738 cur_type, cur, stop_type, stop, &update);
3740 /* accurate seeking implies seek tables are used to obtain position,
3741 * and the requested segment is maintained exactly, not adjusted any way */
3742 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3744 /* maybe we can be accurate for (almost) free */
3745 gst_base_parse_find_offset (parse, seeksegment.last_stop, TRUE, &start_ts);
3746 if (seeksegment.last_stop <= start_ts + TARGET_DIFFERENCE) {
3747 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3751 GstClockTime startpos = seeksegment.last_stop;
3753 /* accurate requested, so ... seek a bit before target */
3754 if (startpos < parse->priv->lead_in_ts)
3757 startpos -= parse->priv->lead_in_ts;
3758 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3759 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3762 start_ts = seeksegment.last_stop;
3763 dstformat = GST_FORMAT_BYTES;
3764 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.last_stop,
3765 &dstformat, &seekpos))
3766 goto convert_failed;
3767 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3768 &dstformat, &seekstop))
3769 goto convert_failed;
3772 GST_DEBUG_OBJECT (parse,
3773 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3775 GST_DEBUG_OBJECT (parse,
3776 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3777 seeksegment.stop, seekstop);
3779 if (parse->priv->pad_mode == GST_ACTIVATE_PULL) {
3782 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3785 if (parse->srcpad) {
3786 GST_DEBUG_OBJECT (parse, "sending flush start");
3787 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3788 /* unlock upstream pull_range */
3789 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3792 gst_pad_pause_task (parse->sinkpad);
3795 /* we should now be able to grab the streaming thread because we stopped it
3796 * with the above flush/pause code */
3797 GST_PAD_STREAM_LOCK (parse->sinkpad);
3799 /* save current position */
3800 last_stop = parse->segment.last_stop;
3801 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3804 /* now commit to new position */
3806 /* prepare for streaming again */
3808 GST_DEBUG_OBJECT (parse, "sending flush stop");
3809 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop ());
3810 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop ());
3811 gst_base_parse_clear_queues (parse);
3813 if (parse->priv->close_segment)
3814 gst_event_unref (parse->priv->close_segment);
3816 parse->priv->close_segment = gst_event_new_new_segment (TRUE,
3817 parse->segment.rate, parse->segment.format,
3818 parse->segment.accum, parse->segment.last_stop, parse->segment.accum);
3820 /* keep track of our last_stop */
3821 seeksegment.accum = parse->segment.last_stop;
3823 GST_DEBUG_OBJECT (parse, "Created close seg format %d, "
3824 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3825 ", pos = %" GST_TIME_FORMAT, format,
3826 GST_TIME_ARGS (parse->segment.accum),
3827 GST_TIME_ARGS (parse->segment.last_stop),
3828 GST_TIME_ARGS (parse->segment.accum));
3831 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3833 /* store the newsegment event so it can be sent from the streaming thread. */
3834 if (parse->priv->pending_segment)
3835 gst_event_unref (parse->priv->pending_segment);
3837 /* This will be sent later in _loop() */
3838 parse->priv->pending_segment =
3839 gst_event_new_new_segment (FALSE, parse->segment.rate,
3840 parse->segment.format, parse->segment.start,
3841 parse->segment.stop, parse->segment.start);
3843 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3844 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3845 ", pos = %" GST_TIME_FORMAT, format,
3846 GST_TIME_ARGS (parse->segment.start),
3847 GST_TIME_ARGS (parse->segment.stop),
3848 GST_TIME_ARGS (parse->segment.start));
3850 /* one last chance in pull mode to stay accurate;
3851 * maybe scan and subclass can find where to go */
3854 GstClockTime ts = seeksegment.last_stop;
3856 gst_base_parse_locate_time (parse, &ts, &scanpos);
3860 /* running collected index now consists of several intervals,
3861 * so optimized check no longer possible */
3862 parse->priv->index_last_valid = FALSE;
3863 parse->priv->index_last_offset = 0;
3864 parse->priv->index_last_ts = 0;
3868 /* mark discont if we are going to stream from another position. */
3869 if (seekpos != parse->priv->offset) {
3870 GST_DEBUG_OBJECT (parse,
3871 "mark DISCONT, we did a seek to another position");
3872 parse->priv->offset = seekpos;
3873 parse->priv->last_offset = seekpos;
3874 parse->priv->seen_keyframe = FALSE;
3875 parse->priv->discont = TRUE;
3876 parse->priv->next_ts = start_ts;
3877 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3878 parse->priv->sync_offset = seekpos;
3879 parse->priv->exact_position = accurate;
3882 /* Start streaming thread if paused */
3883 gst_pad_start_task (parse->sinkpad,
3884 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3886 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3891 GstEvent *new_event;
3892 GstBaseParseSeek *seek;
3893 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
3895 /* The only thing we need to do in PUSH-mode is to send the
3896 seek event (in bytes) to upstream. Segment / flush handling happens
3897 in corresponding src event handlers */
3898 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3899 if (seekstop >= 0 && seekpos <= seekpos)
3901 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
3902 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3904 /* store segment info so its precise details can be reconstructed when
3905 * receiving newsegment;
3906 * this matters for all details when accurate seeking,
3907 * is most useful to preserve NONE stop time otherwise */
3908 seek = g_new0 (GstBaseParseSeek, 1);
3909 seek->segment = seeksegment;
3910 seek->accurate = accurate;
3911 seek->offset = seekpos;
3912 seek->start_ts = start_ts;
3913 GST_OBJECT_LOCK (parse);
3914 /* less optimal, but preserves order */
3915 parse->priv->pending_seeks =
3916 g_slist_append (parse->priv->pending_seeks, seek);
3917 GST_OBJECT_UNLOCK (parse);
3919 res = gst_pad_push_event (parse->sinkpad, new_event);
3922 GST_OBJECT_LOCK (parse);
3923 parse->priv->pending_seeks =
3924 g_slist_remove (parse->priv->pending_seeks, seek);
3925 GST_OBJECT_UNLOCK (parse);
3931 /* handled event is ours to free */
3933 gst_event_unref (event);
3939 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
3945 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
3951 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
3957 /* Checks if bitrates are available from upstream tags so that we don't
3958 * override them later
3961 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
3963 GstTagList *taglist = NULL;
3966 gst_event_parse_tag (event, &taglist);
3968 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
3969 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
3970 parse->priv->post_min_bitrate = FALSE;
3972 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
3973 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
3974 parse->priv->post_avg_bitrate = FALSE;
3976 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
3977 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
3978 parse->priv->post_max_bitrate = FALSE;
3983 gst_base_parse_sink_setcaps (GstPad * pad, GstCaps * caps)
3985 GstBaseParse *parse;
3986 GstBaseParseClass *klass;
3987 gboolean res = TRUE;
3989 parse = GST_BASE_PARSE (GST_PAD_PARENT (pad));
3990 klass = GST_BASE_PARSE_GET_CLASS (parse);
3992 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
3994 if (klass->set_sink_caps)
3995 res = klass->set_sink_caps (parse, caps);
4001 gst_base_parse_sink_getcaps (GstPad * pad)
4003 GstBaseParse *parse;
4004 GstBaseParseClass *klass;
4007 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
4008 klass = GST_BASE_PARSE_GET_CLASS (parse);
4009 g_assert (pad == GST_BASE_PARSE_SINK_PAD (parse));
4011 if (klass->get_sink_caps)
4012 caps = klass->get_sink_caps (parse);
4014 caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
4015 gst_object_unref (parse);
4017 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT, caps);
4023 gst_base_parse_set_index (GstElement * element, GstIndex * index)
4025 GstBaseParse *parse = GST_BASE_PARSE (element);
4027 GST_BASE_PARSE_INDEX_LOCK (parse);
4028 if (parse->priv->index)
4029 gst_object_unref (parse->priv->index);
4031 parse->priv->index = gst_object_ref (index);
4032 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4033 &parse->priv->index_id);
4034 parse->priv->own_index = FALSE;
4036 parse->priv->index = NULL;
4038 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4042 gst_base_parse_get_index (GstElement * element)
4044 GstBaseParse *parse = GST_BASE_PARSE (element);
4045 GstIndex *result = NULL;
4047 GST_BASE_PARSE_INDEX_LOCK (parse);
4048 if (parse->priv->index)
4049 result = gst_object_ref (parse->priv->index);
4050 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4055 static GstStateChangeReturn
4056 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4058 GstBaseParse *parse;
4059 GstStateChangeReturn result;
4061 parse = GST_BASE_PARSE (element);
4063 switch (transition) {
4064 case GST_STATE_CHANGE_READY_TO_PAUSED:
4065 /* If this is our own index destroy it as the
4066 * old entries might be wrong for the new stream */
4067 GST_BASE_PARSE_INDEX_LOCK (parse);
4068 if (parse->priv->own_index) {
4069 gst_object_unref (parse->priv->index);
4070 parse->priv->index = NULL;
4071 parse->priv->own_index = FALSE;
4074 /* If no index was created, generate one */
4075 if (G_UNLIKELY (!parse->priv->index)) {
4076 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4078 parse->priv->index = gst_index_factory_make ("memindex");
4079 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4080 &parse->priv->index_id);
4081 parse->priv->own_index = TRUE;
4083 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4089 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4091 switch (transition) {
4092 case GST_STATE_CHANGE_PAUSED_TO_READY:
4093 gst_base_parse_reset (parse);