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 /* frames/buffers that are queued and ready to go on OK */
280 GQueue queued_frames;
284 /* index entry storage, either ours or provided */
288 #if !GLIB_CHECK_VERSION (2, 31, 0)
289 GStaticMutex index_lock;
294 /* seek table entries only maintained if upstream is BYTE seekable */
295 gboolean upstream_seekable;
296 gboolean upstream_has_duration;
297 gint64 upstream_size;
298 /* minimum distance between two index entries */
299 GstClockTimeDiff idx_interval;
300 /* ts and offset of last entry added */
301 GstClockTime index_last_ts;
302 gint64 index_last_offset;
303 gboolean index_last_valid;
305 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
306 gboolean exact_position;
307 /* seek events are temporarily kept to match them with newsegments */
308 GSList *pending_seeks;
310 /* reverse playback */
311 GSList *buffers_pending;
312 GSList *buffers_queued;
313 GSList *buffers_send;
314 GstClockTime last_ts;
317 /* Pending serialized events */
318 GList *pending_events;
319 /* Newsegment event to be sent after SEEK */
320 gboolean pending_segment;
321 /* Segment event that closes the running segment prior to SEEK */
322 GstEvent *close_segment;
324 /* push mode helper frame */
325 GstBaseParseFrame frame;
327 /* TRUE if we're still detecting the format, i.e.
328 * if ::detect() is still called for future buffers */
330 GList *detect_buffers;
331 guint detect_buffers_size;
334 typedef struct _GstBaseParseSeek
339 GstClockTime start_ts;
342 #if !GLIB_CHECK_VERSION (2, 31, 0)
343 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
344 g_static_mutex_lock (&parse->priv->index_lock);
345 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
346 g_static_mutex_unlock (&parse->priv->index_lock);
348 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
349 g_mutex_lock (&parse->priv->index_lock);
350 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
351 g_mutex_unlock (&parse->priv->index_lock);
354 static GstElementClass *parent_class = NULL;
356 static void gst_base_parse_class_init (GstBaseParseClass * klass);
357 static void gst_base_parse_init (GstBaseParse * parse,
358 GstBaseParseClass * klass);
361 gst_base_parse_get_type (void)
363 static volatile gsize base_parse_type = 0;
365 if (g_once_init_enter (&base_parse_type)) {
366 static const GTypeInfo base_parse_info = {
367 sizeof (GstBaseParseClass),
368 (GBaseInitFunc) NULL,
369 (GBaseFinalizeFunc) NULL,
370 (GClassInitFunc) gst_base_parse_class_init,
373 sizeof (GstBaseParse),
375 (GInstanceInitFunc) gst_base_parse_init,
379 _type = g_type_register_static (GST_TYPE_ELEMENT,
380 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
381 g_once_init_leave (&base_parse_type, _type);
383 return (GType) base_parse_type;
386 static void gst_base_parse_finalize (GObject * object);
388 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
389 GstStateChange transition);
390 static void gst_base_parse_reset (GstBaseParse * parse);
392 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
393 static GstIndex *gst_base_parse_get_index (GstElement * element);
395 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad);
396 static gboolean gst_base_parse_sink_activate_push (GstPad * pad,
398 static gboolean gst_base_parse_sink_activate_pull (GstPad * pad,
400 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
402 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
404 static gboolean gst_base_parse_src_event (GstPad * pad, GstEvent * event);
405 static gboolean gst_base_parse_sink_event (GstPad * pad, GstEvent * event);
406 static gboolean gst_base_parse_query (GstPad * pad, GstQuery * query);
407 static gboolean gst_base_parse_sink_setcaps (GstPad * pad, GstCaps * caps);
408 static GstCaps *gst_base_parse_sink_getcaps (GstPad * pad);
409 static const GstQueryType *gst_base_parse_get_querytypes (GstPad * pad);
411 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstBuffer * buffer);
412 static void gst_base_parse_loop (GstPad * pad);
414 static gboolean gst_base_parse_check_frame (GstBaseParse * parse,
415 GstBaseParseFrame * frame, guint * framesize, gint * skipsize);
416 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
417 GstBaseParseFrame * frame);
419 static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse,
422 static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse,
425 static void gst_base_parse_drain (GstBaseParse * parse);
427 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
428 gboolean post_min, gboolean post_avg, gboolean post_max);
430 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
431 GstClockTime time, gboolean before, GstClockTime * _ts);
432 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
433 GstClockTime * _time, gint64 * _offset);
435 static GstFlowReturn gst_base_parse_process_fragment (GstBaseParse * parse,
438 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
441 gst_base_parse_clear_queues (GstBaseParse * parse)
443 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
444 g_slist_free (parse->priv->buffers_queued);
445 parse->priv->buffers_queued = NULL;
446 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
448 g_slist_free (parse->priv->buffers_pending);
449 parse->priv->buffers_pending = NULL;
450 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
451 g_slist_free (parse->priv->buffers_send);
452 parse->priv->buffers_send = NULL;
454 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
455 g_list_free (parse->priv->detect_buffers);
456 parse->priv->detect_buffers = NULL;
457 parse->priv->detect_buffers_size = 0;
459 g_queue_foreach (&parse->priv->queued_frames,
460 (GFunc) gst_base_parse_frame_free, NULL);
461 g_queue_clear (&parse->priv->queued_frames);
463 gst_buffer_replace (&parse->priv->cache, NULL);
465 g_list_foreach (parse->priv->pending_events, (GFunc) gst_event_unref, NULL);
466 g_list_free (parse->priv->pending_events);
467 parse->priv->pending_events = NULL;
468 parse->priv->pending_segment = FALSE;
470 gst_event_replace (&parse->priv->close_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->close_segment) {
482 p_ev = &parse->priv->close_segment;
483 gst_event_replace (p_ev, NULL);
486 if (parse->priv->cache) {
487 gst_buffer_unref (parse->priv->cache);
488 parse->priv->cache = NULL;
491 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
493 g_list_free (parse->priv->pending_events);
494 parse->priv->pending_events = NULL;
495 parse->priv->pending_segment = FALSE;
497 if (parse->priv->index) {
498 gst_object_unref (parse->priv->index);
499 parse->priv->index = NULL;
501 #if !GLIB_CHECK_VERSION (2, 31, 0)
502 g_static_mutex_free (&parse->priv->index_lock);
504 g_mutex_clear (&parse->priv->index_lock);
507 gst_base_parse_clear_queues (parse);
509 G_OBJECT_CLASS (parent_class)->finalize (object);
513 gst_base_parse_class_init (GstBaseParseClass * klass)
515 GObjectClass *gobject_class;
516 GstElementClass *gstelement_class;
518 gobject_class = G_OBJECT_CLASS (klass);
519 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
520 parent_class = g_type_class_peek_parent (klass);
521 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
523 gstelement_class = (GstElementClass *) klass;
524 gstelement_class->change_state =
525 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
526 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
527 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
529 /* Default handlers */
530 klass->check_valid_frame = gst_base_parse_check_frame;
531 klass->parse_frame = gst_base_parse_parse_frame;
532 klass->src_event = gst_base_parse_src_eventfunc;
533 klass->convert = gst_base_parse_convert_default;
535 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
536 "baseparse element");
540 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
542 GstPadTemplate *pad_template;
544 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
546 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
549 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
550 g_return_if_fail (pad_template != NULL);
551 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
552 gst_pad_set_event_function (parse->sinkpad,
553 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
554 gst_pad_set_setcaps_function (parse->sinkpad,
555 GST_DEBUG_FUNCPTR (gst_base_parse_sink_setcaps));
556 gst_pad_set_getcaps_function (parse->sinkpad,
557 GST_DEBUG_FUNCPTR (gst_base_parse_sink_getcaps));
558 gst_pad_set_chain_function (parse->sinkpad,
559 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
560 gst_pad_set_activate_function (parse->sinkpad,
561 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
562 gst_pad_set_activatepush_function (parse->sinkpad,
563 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_push));
564 gst_pad_set_activatepull_function (parse->sinkpad,
565 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_pull));
566 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
568 GST_DEBUG_OBJECT (parse, "sinkpad created");
571 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
572 g_return_if_fail (pad_template != NULL);
573 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
574 gst_pad_set_event_function (parse->srcpad,
575 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
576 gst_pad_set_query_type_function (parse->srcpad,
577 GST_DEBUG_FUNCPTR (gst_base_parse_get_querytypes));
578 gst_pad_set_query_function (parse->srcpad,
579 GST_DEBUG_FUNCPTR (gst_base_parse_query));
580 gst_pad_use_fixed_caps (parse->srcpad);
581 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
582 GST_DEBUG_OBJECT (parse, "src created");
584 g_queue_init (&parse->priv->queued_frames);
586 parse->priv->adapter = gst_adapter_new ();
588 parse->priv->pad_mode = GST_ACTIVATE_NONE;
590 #if !GLIB_CHECK_VERSION (2, 31, 0)
591 g_static_mutex_init (&parse->priv->index_lock);
593 g_mutex_init (&parse->priv->index_lock);
597 gst_base_parse_reset (parse);
598 GST_DEBUG_OBJECT (parse, "init ok");
601 static GstBaseParseFrame *
602 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
604 GstBaseParseFrame *copy;
606 copy = g_slice_dup (GstBaseParseFrame, frame);
607 copy->buffer = gst_buffer_ref (frame->buffer);
608 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
610 GST_TRACE ("copied frame %p -> %p", frame, copy);
616 gst_base_parse_frame_free (GstBaseParseFrame * frame)
618 GST_TRACE ("freeing frame %p", frame);
621 gst_buffer_unref (frame->buffer);
622 frame->buffer = NULL;
625 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
626 g_slice_free (GstBaseParseFrame, frame);
628 memset (frame, 0, sizeof (*frame));
633 gst_base_parse_frame_get_type (void)
635 static volatile gsize frame_type = 0;
637 if (g_once_init_enter (&frame_type)) {
640 _type = g_boxed_type_register_static ("GstBaseParseFrame",
641 (GBoxedCopyFunc) gst_base_parse_frame_copy,
642 (GBoxedFreeFunc) gst_base_parse_frame_free);
643 g_once_init_leave (&frame_type, _type);
645 return (GType) frame_type;
649 * gst_base_parse_frame_init:
650 * @frame: #GstBaseParseFrame.
652 * Sets a #GstBaseParseFrame to initial state. Currently this means
653 * all public fields are zero-ed and a private flag is set to make
654 * sure gst_base_parse_frame_free() only frees the contents but not
655 * the actual frame. Use this function to initialise a #GstBaseParseFrame
656 * allocated on the stack.
661 gst_base_parse_frame_init (GstBaseParseFrame * frame)
663 memset (frame, 0, sizeof (GstBaseParseFrame));
664 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
665 GST_TRACE ("inited frame %p", frame);
669 * gst_base_parse_frame_new:
670 * @buffer: (transfer none): a #GstBuffer
672 * @overhead: number of bytes in this frame which should be counted as
673 * metadata overhead, ie. not used to calculate the average bitrate.
674 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
676 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
677 * elements written in C should usually allocate the frame on the stack and
678 * then use gst_base_parse_frame_init() to initialise it.
680 * Returns: a newly-allocated #GstBaseParseFrame. Free with
681 * gst_base_parse_frame_free() when no longer needed, unless you gave
682 * away ownership to gst_base_parse_push_frame().
687 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
690 GstBaseParseFrame *frame;
692 frame = g_slice_new0 (GstBaseParseFrame);
693 frame->buffer = gst_buffer_ref (buffer);
695 GST_TRACE ("created frame %p", frame);
700 gst_base_parse_frame_update (GstBaseParse * parse, GstBaseParseFrame * frame,
703 gst_buffer_replace (&frame->buffer, buf);
707 /* set flags one by one for clarity */
708 if (G_UNLIKELY (parse->priv->drain))
709 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
711 /* losing sync is pretty much a discont (and vice versa), no ? */
712 if (G_UNLIKELY (parse->priv->discont))
713 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
717 gst_base_parse_reset (GstBaseParse * parse)
719 GST_OBJECT_LOCK (parse);
720 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
721 parse->priv->duration = -1;
722 parse->priv->min_frame_size = 1;
723 parse->priv->discont = TRUE;
724 parse->priv->flushing = FALSE;
725 parse->priv->offset = 0;
726 parse->priv->sync_offset = 0;
727 parse->priv->update_interval = -1;
728 parse->priv->fps_num = parse->priv->fps_den = 0;
729 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
730 parse->priv->lead_in = parse->priv->lead_out = 0;
731 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
732 parse->priv->bitrate = 0;
733 parse->priv->framecount = 0;
734 parse->priv->bytecount = 0;
735 parse->priv->acc_duration = 0;
736 parse->priv->first_frame_ts = GST_CLOCK_TIME_NONE;
737 parse->priv->first_frame_offset = -1;
738 parse->priv->estimated_duration = -1;
739 parse->priv->estimated_drift = 0;
740 parse->priv->next_ts = 0;
741 parse->priv->syncable = TRUE;
742 parse->priv->passthrough = FALSE;
743 parse->priv->has_timing_info = FALSE;
744 parse->priv->post_min_bitrate = TRUE;
745 parse->priv->post_avg_bitrate = TRUE;
746 parse->priv->post_max_bitrate = TRUE;
747 parse->priv->min_bitrate = G_MAXUINT;
748 parse->priv->max_bitrate = 0;
749 parse->priv->avg_bitrate = 0;
750 parse->priv->posted_avg_bitrate = 0;
752 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
753 parse->priv->index_last_offset = -1;
754 parse->priv->index_last_valid = TRUE;
755 parse->priv->upstream_seekable = FALSE;
756 parse->priv->upstream_size = 0;
757 parse->priv->upstream_has_duration = FALSE;
758 parse->priv->idx_interval = 0;
759 parse->priv->exact_position = TRUE;
760 parse->priv->seen_keyframe = FALSE;
762 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
763 parse->priv->last_offset = 0;
765 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
767 g_list_free (parse->priv->pending_events);
768 parse->priv->pending_events = NULL;
769 parse->priv->pending_segment = FALSE;
771 gst_event_replace (&parse->priv->close_segment, NULL);
773 if (parse->priv->cache) {
774 gst_buffer_unref (parse->priv->cache);
775 parse->priv->cache = NULL;
778 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
779 g_slist_free (parse->priv->pending_seeks);
780 parse->priv->pending_seeks = NULL;
782 if (parse->priv->adapter)
783 gst_adapter_clear (parse->priv->adapter);
785 /* we know it is not alloc'ed, but maybe other stuff to free, some day ... */
786 parse->priv->frame._private_flags |=
787 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
788 gst_base_parse_frame_free (&parse->priv->frame);
790 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
791 g_list_free (parse->priv->detect_buffers);
792 parse->priv->detect_buffers = NULL;
793 parse->priv->detect_buffers_size = 0;
794 GST_OBJECT_UNLOCK (parse);
797 /* gst_base_parse_check_frame:
798 * @parse: #GstBaseParse.
799 * @buffer: GstBuffer.
800 * @framesize: This will be set to tell the found frame size in bytes.
801 * @skipsize: Output parameter that tells how much data needs to be skipped
802 * in order to find the following frame header.
804 * Default callback for check_valid_frame.
806 * Returns: Always TRUE.
809 gst_base_parse_check_frame (GstBaseParse * parse,
810 GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
812 *framesize = GST_BUFFER_SIZE (frame->buffer);
818 /* gst_base_parse_parse_frame:
819 * @parse: #GstBaseParse.
820 * @buffer: #GstBuffer.
822 * Default callback for parse_frame.
825 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
827 GstBuffer *buffer = frame->buffer;
829 if (!GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
830 GST_CLOCK_TIME_IS_VALID (parse->priv->next_ts)) {
831 GST_BUFFER_TIMESTAMP (buffer) = parse->priv->next_ts;
833 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
834 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
835 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
840 /* gst_base_parse_convert:
841 * @parse: #GstBaseParse.
842 * @src_format: #GstFormat describing the source format.
843 * @src_value: Source value to be converted.
844 * @dest_format: #GstFormat defining the converted format.
845 * @dest_value: Pointer where the conversion result will be put.
847 * Converts using configured "convert" vmethod in #GstBaseParse class.
849 * Returns: TRUE if conversion was successful.
852 gst_base_parse_convert (GstBaseParse * parse,
853 GstFormat src_format,
854 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
856 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
859 g_return_val_if_fail (dest_value != NULL, FALSE);
864 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
866 #ifndef GST_DISABLE_GST_DEBUG
869 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
870 GST_LOG_OBJECT (parse,
871 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
872 GST_TIME_ARGS (src_value), *dest_value);
873 } else if (dest_format == GST_FORMAT_TIME &&
874 src_format == GST_FORMAT_BYTES) {
875 GST_LOG_OBJECT (parse,
876 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
877 src_value, GST_TIME_ARGS (*dest_value));
879 GST_LOG_OBJECT (parse,
880 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
881 GST_STR_NULL (gst_format_get_name (src_format)),
882 GST_STR_NULL (gst_format_get_name (dest_format)),
883 src_value, *dest_value);
886 GST_DEBUG_OBJECT (parse, "conversion failed");
894 /* gst_base_parse_sink_event:
895 * @pad: #GstPad that received the event.
896 * @event: #GstEvent to be handled.
898 * Handler for sink pad events.
900 * Returns: TRUE if the event was handled.
903 gst_base_parse_sink_event (GstPad * pad, GstEvent * event)
906 GstBaseParseClass *bclass;
907 gboolean handled = FALSE;
910 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
911 bclass = GST_BASE_PARSE_GET_CLASS (parse);
913 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
914 GST_EVENT_TYPE_NAME (event));
916 /* Cache all serialized events except EOS, NEWSEGMENT and FLUSH_STOP if we have a
918 if (parse->priv->pending_segment && GST_EVENT_IS_SERIALIZED (event)
919 && GST_EVENT_TYPE (event) != GST_EVENT_EOS
920 && GST_EVENT_TYPE (event) != GST_EVENT_NEWSEGMENT
921 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
922 && GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP) {
924 if (GST_EVENT_TYPE (event) == GST_EVENT_TAG)
925 /* See if any bitrate tags were posted */
926 gst_base_parse_handle_tag (parse, event);
928 parse->priv->pending_events =
929 g_list_append (parse->priv->pending_events, event);
932 if (GST_EVENT_TYPE (event) == GST_EVENT_EOS &&
933 parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
934 /* We've not posted bitrate tags yet - do so now */
935 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
938 handled = bclass->event (parse, event);
941 handled = gst_base_parse_sink_eventfunc (parse, event);
944 ret = gst_pad_event_default (pad, event);
947 gst_object_unref (parse);
948 GST_DEBUG_OBJECT (parse, "event handled");
953 /* gst_base_parse_sink_eventfunc:
954 * @parse: #GstBaseParse.
955 * @event: #GstEvent to be handled.
957 * Element-level event handler function.
959 * The event will be unreffed only if it has been handled and this
960 * function returns %TRUE
962 * Returns: %TRUE if the event was handled and not need forwarding.
965 gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event)
967 gboolean handled = FALSE;
969 switch (GST_EVENT_TYPE (event)) {
970 case GST_EVENT_NEWSEGMENT:
972 gdouble rate, applied_rate;
974 gint64 start, stop, pos, next_ts, offset = 0;
977 gst_event_parse_new_segment_full (event, &update, &rate, &applied_rate,
978 &format, &start, &stop, &pos);
980 GST_DEBUG_OBJECT (parse, "newseg rate %g, applied rate %g, "
981 "format %d, start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
982 ", pos = %" GST_TIME_FORMAT, rate, applied_rate, format,
983 GST_TIME_ARGS (start), GST_TIME_ARGS (stop), GST_TIME_ARGS (pos));
985 if (format == GST_FORMAT_BYTES) {
986 GstClockTime seg_start, seg_stop;
987 GstBaseParseSeek *seek = NULL;
990 /* stop time is allowed to be open-ended, but not start & pos */
991 seg_stop = GST_CLOCK_TIME_NONE;
995 GST_OBJECT_LOCK (parse);
996 for (node = parse->priv->pending_seeks; node; node = node->next) {
997 GstBaseParseSeek *tmp = node->data;
999 if (tmp->offset == pos) {
1004 parse->priv->pending_seeks =
1005 g_slist_remove (parse->priv->pending_seeks, seek);
1006 GST_OBJECT_UNLOCK (parse);
1009 GST_DEBUG_OBJECT (parse,
1010 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
1011 seek->accurate ? " accurate" : "", &seek->segment);
1012 seg_start = seek->segment.start;
1013 seg_stop = seek->segment.stop;
1014 next_ts = seek->start_ts;
1015 parse->priv->exact_position = seek->accurate;
1018 /* best attempt convert */
1019 /* as these are only estimates, stop is kept open-ended to avoid
1020 * premature cutting */
1021 gst_base_parse_convert (parse, GST_FORMAT_BYTES, start,
1022 GST_FORMAT_TIME, (gint64 *) & seg_start);
1023 parse->priv->exact_position = (start == 0);
1024 next_ts = seg_start;
1027 gst_event_unref (event);
1028 event = gst_event_new_new_segment_full (update, rate, applied_rate,
1029 GST_FORMAT_TIME, seg_start, seg_stop, seg_start);
1030 format = GST_FORMAT_TIME;
1033 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. "
1034 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT,
1035 GST_TIME_ARGS (seg_start), GST_TIME_ARGS (seg_stop));
1036 } else if (format != GST_FORMAT_TIME) {
1037 /* Unknown incoming segment format. Output a default open-ended
1039 gst_event_unref (event);
1040 event = gst_event_new_new_segment_full (update, rate, applied_rate,
1041 GST_FORMAT_TIME, 0, GST_CLOCK_TIME_NONE, 0);
1042 format = GST_FORMAT_TIME;
1043 next_ts = start = 0;
1044 stop = GST_CLOCK_TIME_NONE;
1046 /* not considered BYTE seekable if it is talking to us in TIME,
1047 * whatever else it might claim */
1048 parse->priv->upstream_seekable = FALSE;
1052 gst_segment_set_newsegment_full (&parse->segment, update, rate,
1053 applied_rate, format, start, stop, start);
1055 /* save the segment for later, right before we push a new buffer so that
1056 * the caps are fixed and the next linked element can receive
1058 parse->priv->pending_events =
1059 g_list_append (parse->priv->pending_events, event);
1060 parse->priv->pending_segment = TRUE;
1063 /* but finish the current segment */
1064 GST_DEBUG_OBJECT (parse, "draining current segment");
1065 if (parse->segment.rate > 0.0)
1066 gst_base_parse_drain (parse);
1068 gst_base_parse_process_fragment (parse, FALSE);
1069 gst_adapter_clear (parse->priv->adapter);
1070 parse->priv->offset = offset;
1071 parse->priv->sync_offset = offset;
1072 parse->priv->next_ts = next_ts;
1073 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1074 parse->priv->discont = TRUE;
1075 parse->priv->seen_keyframe = FALSE;
1079 case GST_EVENT_FLUSH_START:
1080 parse->priv->flushing = TRUE;
1081 handled = gst_pad_push_event (parse->srcpad, gst_event_ref (event));
1083 gst_event_unref (event);
1084 /* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
1085 GST_PAD_STREAM_LOCK (parse->srcpad);
1086 GST_PAD_STREAM_UNLOCK (parse->srcpad);
1090 case GST_EVENT_FLUSH_STOP:
1091 gst_adapter_clear (parse->priv->adapter);
1092 gst_base_parse_clear_queues (parse);
1093 parse->priv->flushing = FALSE;
1094 parse->priv->discont = TRUE;
1095 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
1096 parse->priv->frame._private_flags |=
1097 GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
1098 gst_base_parse_frame_free (&parse->priv->frame);
1102 if (parse->segment.rate > 0.0)
1103 gst_base_parse_drain (parse);
1105 gst_base_parse_process_fragment (parse, FALSE);
1107 /* If we STILL have zero frames processed, fire an error */
1108 if (parse->priv->framecount == 0) {
1109 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1110 ("No valid frames found before end of stream"), (NULL));
1112 /* newsegment and other serialized events before eos */
1113 if (G_UNLIKELY (parse->priv->pending_events)) {
1116 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
1117 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
1119 g_list_free (parse->priv->pending_events);
1120 parse->priv->pending_events = NULL;
1121 parse->priv->pending_segment = FALSE;
1133 /* gst_base_parse_src_event:
1134 * @pad: #GstPad that received the event.
1135 * @event: #GstEvent that was received.
1137 * Handler for source pad events.
1139 * Returns: TRUE if the event was handled.
1142 gst_base_parse_src_event (GstPad * pad, GstEvent * event)
1144 GstBaseParse *parse;
1145 GstBaseParseClass *bclass;
1146 gboolean handled = FALSE;
1147 gboolean ret = TRUE;
1149 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
1150 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1152 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1153 GST_EVENT_TYPE_NAME (event));
1155 if (bclass->src_event)
1156 handled = bclass->src_event (parse, event);
1159 ret = gst_pad_event_default (pad, event);
1161 gst_object_unref (parse);
1166 gst_base_parse_is_seekable (GstBaseParse * parse)
1168 /* FIXME: could do more here, e.g. check index or just send data from 0
1169 * in pull mode and let decoder/sink clip */
1170 return parse->priv->syncable;
1173 /* gst_base_parse_src_eventfunc:
1174 * @parse: #GstBaseParse.
1175 * @event: #GstEvent that was received.
1177 * Default srcpad event handler.
1179 * Returns: TRUE if the event was handled and can be dropped.
1182 gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
1184 gboolean handled = FALSE;
1186 switch (GST_EVENT_TYPE (event)) {
1187 case GST_EVENT_SEEK:
1189 if (gst_base_parse_is_seekable (parse)) {
1190 handled = gst_base_parse_handle_seek (parse, event);
1202 * gst_base_parse_convert_default:
1203 * @parse: #GstBaseParse.
1204 * @src_format: #GstFormat describing the source format.
1205 * @src_value: Source value to be converted.
1206 * @dest_format: #GstFormat defining the converted format.
1207 * @dest_value: Pointer where the conversion result will be put.
1209 * Default implementation of "convert" vmethod in #GstBaseParse class.
1211 * Returns: TRUE if conversion was successful.
1216 gst_base_parse_convert_default (GstBaseParse * parse,
1217 GstFormat src_format,
1218 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1220 gboolean ret = FALSE;
1221 guint64 bytes, duration;
1223 if (G_UNLIKELY (src_format == dest_format)) {
1224 *dest_value = src_value;
1228 if (G_UNLIKELY (src_value == -1)) {
1233 if (G_UNLIKELY (src_value == 0)) {
1238 /* need at least some frames */
1239 if (!parse->priv->framecount)
1242 duration = parse->priv->acc_duration / GST_MSECOND;
1243 bytes = parse->priv->bytecount;
1245 if (G_UNLIKELY (!duration || !bytes))
1248 if (src_format == GST_FORMAT_BYTES) {
1249 if (dest_format == GST_FORMAT_TIME) {
1250 /* BYTES -> TIME conversion */
1251 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1252 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1253 *dest_value *= GST_MSECOND;
1254 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1255 *dest_value / GST_MSECOND);
1258 } else if (src_format == GST_FORMAT_TIME) {
1259 if (dest_format == GST_FORMAT_BYTES) {
1260 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1261 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1263 GST_DEBUG_OBJECT (parse,
1264 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1265 src_value / GST_MSECOND, *dest_value);
1268 } else if (src_format == GST_FORMAT_DEFAULT) {
1269 /* DEFAULT == frame-based */
1270 if (dest_format == GST_FORMAT_TIME) {
1271 if (parse->priv->fps_den) {
1272 *dest_value = gst_util_uint64_scale (src_value,
1273 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1276 } else if (dest_format == GST_FORMAT_BYTES) {
1284 gst_base_parse_update_duration (GstBaseParse * baseparse)
1287 GstBaseParse *parse;
1289 parse = GST_BASE_PARSE (baseparse);
1291 peer = gst_pad_get_peer (parse->sinkpad);
1293 GstFormat pformat = GST_FORMAT_BYTES;
1294 gboolean qres = FALSE;
1295 gint64 ptot, dest_value;
1297 qres = gst_pad_query_duration (peer, &pformat, &ptot);
1298 gst_object_unref (GST_OBJECT (peer));
1300 if (gst_base_parse_convert (parse, pformat, ptot,
1301 GST_FORMAT_TIME, &dest_value)) {
1303 /* inform if duration changed, but try to avoid spamming */
1304 parse->priv->estimated_drift +=
1305 dest_value - parse->priv->estimated_duration;
1306 if (parse->priv->estimated_drift > GST_SECOND ||
1307 parse->priv->estimated_drift < -GST_SECOND) {
1308 gst_element_post_message (GST_ELEMENT (parse),
1309 gst_message_new_duration (GST_OBJECT (parse),
1310 GST_FORMAT_TIME, dest_value));
1311 parse->priv->estimated_drift = 0;
1313 parse->priv->estimated_duration = dest_value;
1314 GST_LOG_OBJECT (parse,
1315 "updated estimated duration to %" GST_TIME_FORMAT,
1316 GST_TIME_ARGS (dest_value));
1323 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1324 gboolean post_avg, gboolean post_max)
1326 GstTagList *taglist = NULL;
1328 if (post_min && parse->priv->post_min_bitrate) {
1329 taglist = gst_tag_list_new ();
1331 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1332 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1335 if (post_avg && parse->priv->post_avg_bitrate) {
1336 if (taglist == NULL)
1337 taglist = gst_tag_list_new ();
1339 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1340 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1341 parse->priv->avg_bitrate, NULL);
1344 if (post_max && parse->priv->post_max_bitrate) {
1345 if (taglist == NULL)
1346 taglist = gst_tag_list_new ();
1348 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1349 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1352 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1353 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1354 parse->priv->max_bitrate);
1356 if (taglist != NULL) {
1357 gst_element_found_tags_for_pad (GST_ELEMENT_CAST (parse), parse->srcpad,
1362 /* gst_base_parse_update_bitrates:
1363 * @parse: #GstBaseParse.
1364 * @buffer: Current frame as a #GstBuffer
1366 * Keeps track of the minimum and maximum bitrates, and also maintains a
1367 * running average bitrate of the stream so far.
1370 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1372 /* Only update the tag on a 10 kbps delta */
1373 static const gint update_threshold = 10000;
1375 guint64 data_len, frame_dur;
1376 gint overhead, frame_bitrate, old_avg_bitrate;
1377 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1378 GstBuffer *buffer = frame->buffer;
1380 overhead = frame->overhead;
1384 data_len = GST_BUFFER_SIZE (buffer) - overhead;
1385 parse->priv->data_bytecount += data_len;
1387 /* duration should be valid by now,
1388 * either set by subclass or maybe based on fps settings */
1389 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1390 /* Calculate duration of a frame from buffer properties */
1391 frame_dur = GST_BUFFER_DURATION (buffer);
1392 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1393 parse->priv->acc_duration;
1396 /* No way to figure out frame duration (is this even possible?) */
1400 /* override if subclass provided bitrate, e.g. metadata based */
1401 if (parse->priv->bitrate) {
1402 parse->priv->avg_bitrate = parse->priv->bitrate;
1403 /* spread this (confirmed) info ASAP */
1404 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1405 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1409 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1413 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1414 parse->priv->avg_bitrate);
1416 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1418 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1419 /* always post all at threshold time */
1420 update_min = update_max = update_avg = TRUE;
1423 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1424 if (frame_bitrate < parse->priv->min_bitrate) {
1425 parse->priv->min_bitrate = frame_bitrate;
1429 if (frame_bitrate > parse->priv->max_bitrate) {
1430 parse->priv->max_bitrate = frame_bitrate;
1434 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1435 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1436 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1441 if ((update_min || update_avg || update_max))
1442 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1449 * gst_base_parse_add_index_entry:
1450 * @parse: #GstBaseParse.
1451 * @offset: offset of entry
1452 * @ts: timestamp associated with offset
1453 * @key: whether entry refers to keyframe
1454 * @force: add entry disregarding sanity checks
1456 * Adds an entry to the index associating @offset to @ts. It is recommended
1457 * to only add keyframe entries. @force allows to bypass checks, such as
1458 * whether the stream is (upstream) seekable, another entry is already "close"
1459 * to the new entry, etc.
1461 * Returns: #gboolean indicating whether entry was added
1466 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1467 GstClockTime ts, gboolean key, gboolean force)
1469 gboolean ret = FALSE;
1470 GstIndexAssociation associations[2];
1472 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1473 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1475 if (G_LIKELY (!force)) {
1477 if (!parse->priv->upstream_seekable) {
1478 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1482 /* FIXME need better helper data structure that handles these issues
1483 * related to ongoing collecting of index entries */
1484 if (parse->priv->index_last_offset >= (gint64) offset) {
1485 GST_DEBUG_OBJECT (parse, "already have entries up to offset "
1486 "0x%08" G_GINT64_MODIFIER "x", parse->priv->index_last_offset);
1490 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1491 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1492 parse->priv->idx_interval) {
1493 GST_DEBUG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1494 GST_TIME_ARGS (parse->priv->index_last_ts));
1498 /* if last is not really the last one */
1499 if (!parse->priv->index_last_valid) {
1500 GstClockTime prev_ts;
1502 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1503 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1504 GST_DEBUG_OBJECT (parse,
1505 "entry too close to existing entry %" GST_TIME_FORMAT,
1506 GST_TIME_ARGS (prev_ts));
1507 parse->priv->index_last_offset = offset;
1508 parse->priv->index_last_ts = ts;
1514 associations[0].format = GST_FORMAT_TIME;
1515 associations[0].value = ts;
1516 associations[1].format = GST_FORMAT_BYTES;
1517 associations[1].value = offset;
1519 /* index might change on-the-fly, although that would be nutty app ... */
1520 GST_BASE_PARSE_INDEX_LOCK (parse);
1521 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1522 (key) ? GST_ASSOCIATION_FLAG_KEY_UNIT : GST_ASSOCIATION_FLAG_DELTA_UNIT,
1523 2, (const GstIndexAssociation *) &associations);
1524 GST_BASE_PARSE_INDEX_UNLOCK (parse);
1527 parse->priv->index_last_offset = offset;
1528 parse->priv->index_last_ts = ts;
1537 /* check for seekable upstream, above and beyond a mere query */
1539 gst_base_parse_check_seekability (GstBaseParse * parse)
1542 gboolean seekable = FALSE;
1543 gint64 start = -1, stop = -1;
1544 guint idx_interval = 0;
1546 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1547 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1548 GST_DEBUG_OBJECT (parse, "seeking query failed");
1552 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1554 /* try harder to query upstream size if we didn't get it the first time */
1555 if (seekable && stop == -1) {
1556 GstFormat fmt = GST_FORMAT_BYTES;
1558 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1559 gst_pad_query_peer_duration (parse->sinkpad, &fmt, &stop);
1562 /* if upstream doesn't know the size, it's likely that it's not seekable in
1563 * practice even if it technically may be seekable */
1564 if (seekable && (start != 0 || stop <= start)) {
1565 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1569 /* let's not put every single frame into our index */
1571 if (stop < 10 * 1024 * 1024)
1573 else if (stop < 100 * 1024 * 1024)
1576 idx_interval = 1000;
1580 gst_query_unref (query);
1582 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1583 G_GUINT64_FORMAT ")", seekable, start, stop);
1584 parse->priv->upstream_seekable = seekable;
1585 parse->priv->upstream_size = seekable ? stop : 0;
1587 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1588 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1591 /* some misc checks on upstream */
1593 gst_base_parse_check_upstream (GstBaseParse * parse)
1595 GstFormat fmt = GST_FORMAT_TIME;
1598 if (gst_pad_query_peer_duration (parse->sinkpad, &fmt, &stop))
1599 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1600 /* upstream has one, accept it also, and no further updates */
1601 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1602 parse->priv->upstream_has_duration = TRUE;
1605 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1606 parse->priv->upstream_has_duration);
1609 /* checks src caps to determine if dealing with audio or video */
1610 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1612 gst_base_parse_check_media (GstBaseParse * parse)
1617 caps = GST_PAD_CAPS (parse->srcpad);
1618 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1619 parse->priv->is_video =
1620 g_str_has_prefix (gst_structure_get_name (s), "video");
1622 /* historical default */
1623 parse->priv->is_video = FALSE;
1626 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1629 /* takes ownership of frame */
1631 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1633 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1634 /* frame allocated on the heap, we can just take ownership */
1635 g_queue_push_tail (&parse->priv->queued_frames, frame);
1636 GST_TRACE ("queued frame %p", frame);
1638 GstBaseParseFrame *copy;
1640 /* probably allocated on the stack, must make a proper copy */
1641 copy = gst_base_parse_frame_copy (frame);
1642 g_queue_push_tail (&parse->priv->queued_frames, copy);
1643 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1644 gst_base_parse_frame_free (frame);
1648 /* gst_base_parse_handle_and_push_buffer:
1649 * @parse: #GstBaseParse.
1650 * @klass: #GstBaseParseClass.
1651 * @frame: (transfer full): a #GstBaseParseFrame
1653 * Parses the frame from given buffer and pushes it forward. Also performs
1654 * timestamp handling and checks the segment limits.
1656 * This is called with srcpad STREAM_LOCK held.
1658 * Returns: #GstFlowReturn
1660 static GstFlowReturn
1661 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
1662 GstBaseParseClass * klass, GstBaseParseFrame * frame)
1668 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1670 buffer = frame->buffer;
1672 if (parse->priv->discont) {
1673 GST_DEBUG_OBJECT (parse, "marking DISCONT");
1674 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1675 parse->priv->discont = FALSE;
1678 /* some one-time start-up */
1679 if (G_UNLIKELY (!parse->priv->framecount)) {
1680 gst_base_parse_check_seekability (parse);
1681 gst_base_parse_check_upstream (parse);
1684 GST_LOG_OBJECT (parse,
1685 "parsing frame at offset %" G_GUINT64_FORMAT
1686 " (%#" G_GINT64_MODIFIER "x) of size %d",
1687 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1688 GST_BUFFER_SIZE (buffer));
1690 /* use default handler to provide initial (upstream) metadata */
1691 gst_base_parse_parse_frame (parse, frame);
1693 /* store offset as it might get overwritten */
1694 offset = GST_BUFFER_OFFSET (buffer);
1695 ret = klass->parse_frame (parse, frame);
1697 buffer = frame->buffer;
1698 /* subclass must play nice */
1699 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1701 /* check if subclass/format can provide ts.
1702 * If so, that allows and enables extra seek and duration determining options */
1703 if (G_UNLIKELY (parse->priv->first_frame_offset < 0 && ret == GST_FLOW_OK)) {
1704 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) && parse->priv->has_timing_info
1705 && parse->priv->pad_mode == GST_ACTIVATE_PULL) {
1706 parse->priv->first_frame_offset = offset;
1707 parse->priv->first_frame_ts = GST_BUFFER_TIMESTAMP (buffer);
1708 GST_DEBUG_OBJECT (parse, "subclass provided ts %" GST_TIME_FORMAT
1709 " for first frame at offset %" G_GINT64_FORMAT,
1710 GST_TIME_ARGS (parse->priv->first_frame_ts),
1711 parse->priv->first_frame_offset);
1712 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
1714 GstClockTime last_ts = G_MAXINT64;
1716 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
1717 gst_base_parse_locate_time (parse, &last_ts, &off);
1718 if (GST_CLOCK_TIME_IS_VALID (last_ts))
1719 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
1722 /* disable further checks */
1723 parse->priv->first_frame_offset = 0;
1727 /* again use default handler to add missing metadata;
1728 * we may have new information on frame properties */
1729 gst_base_parse_parse_frame (parse, frame);
1730 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1731 GST_BUFFER_DURATION_IS_VALID (buffer)) {
1732 parse->priv->next_ts =
1733 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer);
1735 /* we lost track, do not produce bogus time next time around
1736 * (probably means parser subclass has given up on parsing as well) */
1737 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
1738 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
1741 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
1742 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1743 gst_base_parse_add_index_entry (parse, offset,
1744 GST_BUFFER_TIMESTAMP (buffer),
1745 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
1747 /* First buffers are dropped, this means that the subclass needs more
1748 * frames to decide on the format and queues them internally */
1749 /* convert internal flow to OK and mark discont for the next buffer. */
1750 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1751 gst_base_parse_frame_free (frame);
1753 } else if (ret == GST_BASE_PARSE_FLOW_QUEUED) {
1754 gst_base_parse_queue_frame (parse, frame);
1756 } else if (ret != GST_FLOW_OK) {
1760 /* All OK, push queued frames if there are any */
1761 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
1762 GstBaseParseFrame *queued_frame;
1764 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
1765 queued_frame->buffer =
1766 gst_buffer_make_metadata_writable (queued_frame->buffer);
1767 gst_buffer_set_caps (queued_frame->buffer,
1768 GST_PAD_CAPS (GST_BASE_PARSE_SRC_PAD (parse)));
1769 gst_base_parse_push_frame (parse, queued_frame);
1773 return gst_base_parse_push_frame (parse, frame);
1777 * gst_base_parse_push_frame:
1778 * @parse: #GstBaseParse.
1779 * @frame: (transfer full): a #GstBaseParseFrame
1781 * Pushes the frame downstream, sends any pending events and
1782 * does some timestamp and segment handling. Takes ownership
1783 * of @frame and will clear it (if it was initialised with
1784 * gst_base_parse_frame_init()) or free it.
1786 * This must be called with sinkpad STREAM_LOCK held.
1788 * Returns: #GstFlowReturn
1793 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1795 GstFlowReturn ret = GST_FLOW_OK;
1796 GstClockTime last_start = GST_CLOCK_TIME_NONE;
1797 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
1798 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1801 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
1802 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
1804 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
1806 buffer = frame->buffer;
1808 GST_LOG_OBJECT (parse,
1809 "processing buffer of size %d with ts %" GST_TIME_FORMAT
1810 ", duration %" GST_TIME_FORMAT, GST_BUFFER_SIZE (buffer),
1811 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buffer)),
1812 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1815 parse->priv->bytecount += GST_BUFFER_SIZE (buffer);
1816 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
1817 parse->priv->framecount++;
1818 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
1819 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
1822 /* 0 means disabled */
1823 if (parse->priv->update_interval < 0)
1824 parse->priv->update_interval = 50;
1825 else if (parse->priv->update_interval > 0 &&
1826 (parse->priv->framecount % parse->priv->update_interval) == 0)
1827 gst_base_parse_update_duration (parse);
1829 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
1830 last_start = last_stop = GST_BUFFER_TIMESTAMP (buffer);
1831 if (last_start != GST_CLOCK_TIME_NONE
1832 && GST_BUFFER_DURATION_IS_VALID (buffer))
1833 last_stop = last_start + GST_BUFFER_DURATION (buffer);
1835 /* should have caps by now */
1836 g_return_val_if_fail (GST_PAD_CAPS (parse->srcpad), GST_FLOW_ERROR);
1838 if (G_UNLIKELY (parse->priv->pending_segment)) {
1839 /* have caps; check identity */
1840 gst_base_parse_check_media (parse);
1843 /* and should then also be linked downstream, so safe to send some events */
1844 if (G_UNLIKELY (parse->priv->close_segment)) {
1845 /* only set up by loop */
1846 GST_DEBUG_OBJECT (parse, "loop sending close segment");
1847 gst_pad_push_event (parse->srcpad, parse->priv->close_segment);
1848 parse->priv->close_segment = NULL;
1851 /* Push pending events, including NEWSEGMENT events */
1852 if (G_UNLIKELY (parse->priv->pending_events)) {
1855 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
1856 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
1858 g_list_free (parse->priv->pending_events);
1859 parse->priv->pending_events = NULL;
1860 parse->priv->pending_segment = FALSE;
1863 /* segment adjustment magic; only if we are running the whole show */
1864 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
1865 (parse->priv->pad_mode == GST_ACTIVATE_PULL ||
1866 parse->priv->upstream_seekable)) {
1868 if (GST_CLOCK_TIME_IS_VALID (parse->segment.last_stop) &&
1869 GST_CLOCK_TIME_IS_VALID (last_start)) {
1870 GstClockTimeDiff diff;
1872 /* only send newsegments with increasing start times,
1873 * otherwise if these go back and forth downstream (sinks) increase
1874 * accumulated time and running_time */
1875 diff = GST_CLOCK_DIFF (parse->segment.last_stop, last_start);
1876 if (G_UNLIKELY (diff > 2 * GST_SECOND
1877 && last_start > parse->segment.start
1878 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
1879 || last_start < parse->segment.stop))) {
1880 GST_DEBUG_OBJECT (parse,
1881 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
1882 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
1883 "Sending updated NEWSEGMENT events", diff,
1884 GST_TIME_ARGS (parse->segment.last_stop),
1885 GST_TIME_ARGS (last_start));
1887 /* send newsegment events such that the gap is not accounted in
1888 * accum time, hence running_time */
1889 /* close ahead of gap */
1890 gst_pad_push_event (parse->srcpad,
1891 gst_event_new_new_segment (TRUE, parse->segment.rate,
1892 parse->segment.format, parse->segment.last_stop,
1893 parse->segment.last_stop, parse->segment.last_stop));
1895 gst_pad_push_event (parse->srcpad,
1896 gst_event_new_new_segment (FALSE, parse->segment.rate,
1897 parse->segment.format, last_start,
1898 parse->segment.stop, last_start));
1900 /* align segment view with downstream,
1901 * prevents double-counting accum when closing segment */
1902 gst_segment_set_newsegment (&parse->segment, FALSE,
1903 parse->segment.rate, parse->segment.format, last_start,
1904 parse->segment.stop, last_start);
1905 parse->segment.last_stop = last_start;
1910 /* update bitrates and optionally post corresponding tags
1911 * (following newsegment) */
1912 gst_base_parse_update_bitrates (parse, frame);
1914 if (klass->pre_push_frame) {
1915 ret = klass->pre_push_frame (parse, frame);
1917 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
1920 /* take final ownership of frame buffer */
1921 buffer = frame->buffer;
1922 frame->buffer = NULL;
1924 /* subclass must play nice */
1925 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
1928 buffer = gst_buffer_make_metadata_writable (buffer);
1929 gst_buffer_set_caps (buffer, GST_PAD_CAPS (parse->srcpad));
1931 parse->priv->seen_keyframe |= parse->priv->is_video &&
1932 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
1934 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
1935 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1936 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
1937 GST_BUFFER_TIMESTAMP (buffer) >
1938 parse->segment.stop + parse->priv->lead_out_ts) {
1939 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
1940 ret = GST_FLOW_UNEXPECTED;
1941 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
1942 GST_BUFFER_DURATION_IS_VALID (buffer) &&
1943 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
1944 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
1945 parse->priv->lead_in_ts < parse->segment.start) {
1946 if (parse->priv->seen_keyframe) {
1947 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
1950 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
1951 ret = GST_BASE_PARSE_FLOW_DROPPED;
1958 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
1959 GST_LOG_OBJECT (parse, "frame (%d bytes) dropped",
1960 GST_BUFFER_SIZE (buffer));
1961 gst_buffer_unref (buffer);
1963 } else if (ret == GST_FLOW_OK) {
1964 if (parse->segment.rate > 0.0) {
1965 GST_LOG_OBJECT (parse, "pushing frame (%d bytes) now..",
1966 GST_BUFFER_SIZE (buffer));
1967 ret = gst_pad_push (parse->srcpad, buffer);
1968 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
1970 GST_LOG_OBJECT (parse, "frame (%d bytes) queued for now",
1971 GST_BUFFER_SIZE (buffer));
1972 parse->priv->buffers_queued =
1973 g_slist_prepend (parse->priv->buffers_queued, buffer);
1977 GST_LOG_OBJECT (parse, "frame (%d bytes) not pushed: %s",
1978 GST_BUFFER_SIZE (buffer), gst_flow_get_name (ret));
1979 gst_buffer_unref (buffer);
1980 /* if we are not sufficiently in control, let upstream decide on EOS */
1981 if (ret == GST_FLOW_UNEXPECTED &&
1982 (parse->priv->passthrough ||
1983 (parse->priv->pad_mode == GST_ACTIVATE_PUSH &&
1984 !parse->priv->upstream_seekable)))
1988 /* Update current running segment position */
1989 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
1990 parse->segment.last_stop < last_stop)
1991 gst_segment_set_last_stop (&parse->segment, GST_FORMAT_TIME, last_stop);
1993 gst_base_parse_frame_free (frame);
1999 /* gst_base_parse_drain:
2001 * Drains the adapter until it is empty. It decreases the min_frame_size to
2002 * match the current adapter size and calls chain method until the adapter
2003 * is emptied or chain returns with error.
2006 gst_base_parse_drain (GstBaseParse * parse)
2010 GST_DEBUG_OBJECT (parse, "draining");
2011 parse->priv->drain = TRUE;
2014 avail = gst_adapter_available (parse->priv->adapter);
2018 if (gst_base_parse_chain (parse->sinkpad, NULL) != GST_FLOW_OK) {
2022 /* nothing changed, maybe due to truncated frame; break infinite loop */
2023 if (avail == gst_adapter_available (parse->priv->adapter)) {
2024 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2025 gst_adapter_clear (parse->priv->adapter);
2029 parse->priv->drain = FALSE;
2032 /* gst_base_parse_send_buffers
2034 * Sends buffers collected in send_buffers downstream, and ensures that list
2035 * is empty at the end (errors or not).
2037 static GstFlowReturn
2038 gst_base_parse_send_buffers (GstBaseParse * parse)
2040 GSList *send = NULL;
2042 GstFlowReturn ret = GST_FLOW_OK;
2044 send = parse->priv->buffers_send;
2048 buf = GST_BUFFER_CAST (send->data);
2049 GST_LOG_OBJECT (parse, "pushing buffer %p, timestamp %"
2050 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2051 ", offset %" G_GINT64_FORMAT, buf,
2052 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
2053 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2055 /* iterate output queue an push downstream */
2056 ret = gst_pad_push (parse->srcpad, buf);
2057 send = g_slist_delete_link (send, send);
2059 /* clear any leftover if error */
2060 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2062 buf = GST_BUFFER_CAST (send->data);
2063 gst_buffer_unref (buf);
2064 send = g_slist_delete_link (send, send);
2069 parse->priv->buffers_send = send;
2074 /* gst_base_parse_process_fragment:
2076 * Processes a reverse playback (forward) fragment:
2077 * - append head of last fragment that was skipped to current fragment data
2078 * - drain the resulting current fragment data (i.e. repeated chain)
2079 * - add time/duration (if needed) to frames queued by chain
2080 * - push queued data
2082 static GstFlowReturn
2083 gst_base_parse_process_fragment (GstBaseParse * parse, gboolean push_only)
2086 GstFlowReturn ret = GST_FLOW_OK;
2087 gboolean seen_key = FALSE, seen_delta = FALSE;
2093 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2094 while (parse->priv->buffers_pending) {
2095 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2096 GST_LOG_OBJECT (parse, "adding pending buffer (size %d)",
2097 GST_BUFFER_SIZE (buf));
2098 gst_adapter_push (parse->priv->adapter, buf);
2099 parse->priv->buffers_pending =
2100 g_slist_delete_link (parse->priv->buffers_pending,
2101 parse->priv->buffers_pending);
2104 /* invalidate so no fall-back timestamping is performed;
2105 * ok if taken from subclass or upstream */
2106 parse->priv->next_ts = GST_CLOCK_TIME_NONE;
2107 /* prevent it hanging around stop all the time */
2108 parse->segment.last_stop = GST_CLOCK_TIME_NONE;
2110 parse->priv->discont = TRUE;
2112 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2113 /* initial skipped data is added to buffers_pending */
2114 gst_base_parse_drain (parse);
2117 if (parse->priv->buffers_send) {
2118 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2119 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2122 /* add metadata (if needed to queued buffers */
2123 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2124 GST_TIME_ARGS (parse->priv->last_ts));
2125 while (parse->priv->buffers_queued) {
2126 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2128 /* no touching if upstream or parsing provided time */
2129 if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
2130 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2131 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2132 } else if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_ts) &&
2133 GST_BUFFER_DURATION_IS_VALID (buf)) {
2134 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_ts))
2135 parse->priv->last_ts -= GST_BUFFER_DURATION (buf);
2137 parse->priv->last_ts = 0;
2138 GST_BUFFER_TIMESTAMP (buf) = parse->priv->last_ts;
2139 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2140 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
2142 /* no idea, very bad */
2143 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2146 parse->priv->last_ts = GST_BUFFER_TIMESTAMP (buf);
2148 /* reverse order for ascending sending */
2149 /* send downstream at keyframe not preceded by a keyframe
2150 * (e.g. that should identify start of collection of IDR nals) */
2151 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2153 ret = gst_base_parse_send_buffers (parse);
2154 /* if a problem, throw all to sending */
2155 if (ret != GST_FLOW_OK) {
2156 parse->priv->buffers_send =
2157 g_slist_reverse (parse->priv->buffers_queued);
2158 parse->priv->buffers_queued = NULL;
2168 parse->priv->buffers_send =
2169 g_slist_prepend (parse->priv->buffers_send, buf);
2170 parse->priv->buffers_queued =
2171 g_slist_delete_link (parse->priv->buffers_queued,
2172 parse->priv->buffers_queued);
2175 /* audio may have all marked as keyframe, so arrange to send here */
2177 ret = gst_base_parse_send_buffers (parse);
2179 /* any trailing unused no longer usable (ideally none) */
2180 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2181 GST_DEBUG_OBJECT (parse, "discarding %d trailing bytes",
2182 gst_adapter_available (parse->priv->adapter));
2183 gst_adapter_clear (parse->priv->adapter);
2189 /* small helper that checks whether we have been trying to resync too long */
2190 static inline GstFlowReturn
2191 gst_base_parse_check_sync (GstBaseParse * parse)
2193 if (G_UNLIKELY (parse->priv->discont &&
2194 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2195 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2196 ("Failed to parse stream"), (NULL));
2197 return GST_FLOW_ERROR;
2203 static GstFlowReturn
2204 gst_base_parse_chain (GstPad * pad, GstBuffer * buffer)
2206 GstBaseParseClass *bclass;
2207 GstBaseParse *parse;
2208 GstFlowReturn ret = GST_FLOW_OK;
2209 GstBuffer *outbuf = NULL;
2210 GstBuffer *tmpbuf = NULL;
2214 guint old_min_size = 0, min_size, av;
2215 GstClockTime timestamp;
2216 GstBaseParseFrame *frame;
2218 parse = GST_BASE_PARSE (GST_OBJECT_PARENT (pad));
2219 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2221 if (parse->priv->detecting) {
2222 GstBuffer *detect_buf;
2224 if (parse->priv->detect_buffers_size == 0) {
2225 detect_buf = gst_buffer_ref (buffer);
2231 gst_buffer_new_and_alloc (parse->priv->detect_buffers_size +
2232 (buffer ? GST_BUFFER_SIZE (buffer) : 0));
2233 for (l = parse->priv->detect_buffers; l; l = l->next) {
2234 memcpy (GST_BUFFER_DATA (detect_buf) + offset,
2235 GST_BUFFER_DATA (l->data), GST_BUFFER_SIZE (l->data));
2236 offset += GST_BUFFER_SIZE (l->data);
2239 memcpy (GST_BUFFER_DATA (detect_buf) + offset, GST_BUFFER_DATA (buffer),
2240 GST_BUFFER_SIZE (buffer));
2243 ret = bclass->detect (parse, detect_buf);
2244 gst_buffer_unref (detect_buf);
2246 if (ret == GST_FLOW_OK) {
2249 /* Detected something */
2250 parse->priv->detecting = FALSE;
2252 for (l = parse->priv->detect_buffers; l; l = l->next) {
2253 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2255 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2256 GST_BUFFER_CAST (l->data));
2258 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2260 g_list_free (parse->priv->detect_buffers);
2261 parse->priv->detect_buffers = NULL;
2262 parse->priv->detect_buffers_size = 0;
2264 if (ret != GST_FLOW_OK) {
2268 /* Handle the current buffer */
2269 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2270 /* Still detecting, append buffer or error out if draining */
2272 if (parse->priv->drain) {
2273 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2274 return GST_FLOW_ERROR;
2275 } else if (parse->priv->flushing) {
2276 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2278 g_list_free (parse->priv->detect_buffers);
2279 parse->priv->detect_buffers = NULL;
2280 parse->priv->detect_buffers_size = 0;
2282 parse->priv->detect_buffers =
2283 g_list_append (parse->priv->detect_buffers, buffer);
2284 parse->priv->detect_buffers_size += GST_BUFFER_SIZE (buffer);
2288 /* Something went wrong, subclass responsible for error reporting */
2292 /* And now handle the current buffer if detection worked */
2295 frame = &parse->priv->frame;
2297 if (G_LIKELY (buffer)) {
2298 GST_LOG_OBJECT (parse, "buffer size: %d, offset = %" G_GINT64_FORMAT,
2299 GST_BUFFER_SIZE (buffer), GST_BUFFER_OFFSET (buffer));
2300 if (G_UNLIKELY (parse->priv->passthrough)) {
2301 gst_base_parse_frame_init (frame);
2302 frame->buffer = gst_buffer_make_metadata_writable (buffer);
2303 return gst_base_parse_push_frame (parse, frame);
2305 /* upstream feeding us in reverse playback;
2306 * gather each fragment, then process it in single run */
2307 if (parse->segment.rate < 0.0) {
2308 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2309 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2310 ret = gst_base_parse_process_fragment (parse, FALSE);
2312 gst_adapter_push (parse->priv->adapter, buffer);
2315 gst_adapter_push (parse->priv->adapter, buffer);
2318 if (G_UNLIKELY (buffer &&
2319 GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2320 frame->_private_flags |= GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
2321 gst_base_parse_frame_free (frame);
2324 /* Parse and push as many frames as possible */
2325 /* Stop either when adapter is empty or we are flushing */
2326 while (!parse->priv->flushing) {
2329 /* maintain frame state for a single frame parsing round across _chain calls,
2330 * so only init when needed */
2331 if (!frame->_private_flags)
2332 gst_base_parse_frame_init (frame);
2334 tmpbuf = gst_buffer_new ();
2337 /* Synchronization loop */
2339 /* note: if subclass indicates MAX fsize,
2340 * this will not likely be available anyway ... */
2341 min_size = MAX (parse->priv->min_frame_size, fsize);
2342 av = gst_adapter_available (parse->priv->adapter);
2344 /* loop safety check */
2345 if (G_UNLIKELY (old_min_size >= min_size))
2347 old_min_size = min_size;
2349 if (G_UNLIKELY (parse->priv->drain)) {
2351 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2352 if (G_UNLIKELY (!min_size)) {
2353 gst_buffer_unref (tmpbuf);
2358 /* Collect at least min_frame_size bytes */
2359 if (av < min_size) {
2360 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)",
2362 gst_buffer_unref (tmpbuf);
2366 /* always pass all available data */
2367 data = gst_adapter_peek (parse->priv->adapter, av);
2368 GST_BUFFER_DATA (tmpbuf) = (guint8 *) data;
2369 GST_BUFFER_SIZE (tmpbuf) = av;
2370 GST_BUFFER_OFFSET (tmpbuf) = parse->priv->offset;
2371 GST_BUFFER_FLAG_SET (tmpbuf, GST_MINI_OBJECT_FLAG_READONLY);
2373 if (parse->priv->discont) {
2374 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2375 GST_BUFFER_FLAG_SET (tmpbuf, GST_BUFFER_FLAG_DISCONT);
2379 gst_base_parse_frame_update (parse, frame, tmpbuf);
2380 res = bclass->check_valid_frame (parse, frame, &fsize, &skip);
2381 gst_buffer_replace (&frame->buffer, NULL);
2383 if (gst_adapter_available (parse->priv->adapter) < fsize) {
2384 GST_DEBUG_OBJECT (parse,
2385 "found valid frame but not enough data available (only %d bytes)",
2386 gst_adapter_available (parse->priv->adapter));
2387 gst_buffer_unref (tmpbuf);
2390 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2394 /* subclass didn't touch this value. By default we skip 1 byte */
2398 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2399 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2400 /* reverse playback, and no frames found yet, so we are skipping
2401 * the leading part of a fragment, which may form the tail of
2402 * fragment coming later, hopefully subclass skips efficiently ... */
2403 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2404 outbuf = gst_adapter_take_buffer (parse->priv->adapter, skip);
2405 outbuf = gst_buffer_make_metadata_writable (outbuf);
2406 GST_BUFFER_TIMESTAMP (outbuf) = timestamp;
2407 parse->priv->buffers_pending =
2408 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2411 gst_adapter_flush (parse->priv->adapter, skip);
2413 parse->priv->offset += skip;
2414 if (!parse->priv->discont)
2415 parse->priv->sync_offset = parse->priv->offset;
2416 parse->priv->discont = TRUE;
2417 /* something changed least; nullify loop check */
2420 /* skip == 0 should imply subclass set min_size to need more data;
2421 * we check this shortly */
2422 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2423 gst_buffer_unref (tmpbuf);
2427 gst_buffer_unref (tmpbuf);
2431 /* Subclass found the sync, but still wants to skip some data */
2432 GST_LOG_OBJECT (parse, "skipping %d bytes", skip);
2433 gst_adapter_flush (parse->priv->adapter, skip);
2434 parse->priv->offset += skip;
2437 /* Grab lock to prevent a race with FLUSH_START handler */
2438 GST_PAD_STREAM_LOCK (parse->srcpad);
2440 /* FLUSH_START event causes the "flushing" flag to be set. In this
2441 * case we can leave the frame pushing loop */
2442 if (parse->priv->flushing) {
2443 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2447 /* move along with upstream timestamp (if any),
2448 * but interpolate in between */
2449 timestamp = gst_adapter_prev_timestamp (parse->priv->adapter, NULL);
2450 if (GST_CLOCK_TIME_IS_VALID (timestamp) &&
2451 (parse->priv->prev_ts != timestamp)) {
2452 parse->priv->prev_ts = parse->priv->next_ts = timestamp;
2455 /* FIXME: Would it be more efficient to make a subbuffer instead? */
2456 outbuf = gst_adapter_take_buffer (parse->priv->adapter, fsize);
2457 outbuf = gst_buffer_make_metadata_writable (outbuf);
2459 /* Subclass may want to know the data offset */
2460 GST_BUFFER_OFFSET (outbuf) = parse->priv->offset;
2461 parse->priv->offset += fsize;
2462 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2463 GST_BUFFER_DURATION (outbuf) = GST_CLOCK_TIME_NONE;
2465 frame->buffer = outbuf;
2466 ret = gst_base_parse_handle_and_push_frame (parse, bclass, frame);
2467 GST_PAD_STREAM_UNLOCK (parse->srcpad);
2469 if (ret != GST_FLOW_OK) {
2470 GST_LOG_OBJECT (parse, "push returned %d", ret);
2476 GST_LOG_OBJECT (parse, "chain leaving");
2482 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2483 ("min_size evolution %d -> %d; breaking to avoid looping",
2484 old_min_size, min_size));
2485 return GST_FLOW_ERROR;
2489 /* pull @size bytes at current offset,
2490 * i.e. at least try to and possibly return a shorter buffer if near the end */
2491 static GstFlowReturn
2492 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
2493 GstBuffer ** buffer)
2495 GstFlowReturn ret = GST_FLOW_OK;
2497 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2499 /* Caching here actually makes much less difference than one would expect.
2500 * We do it mainly to avoid pulling buffers of 1 byte all the time */
2501 if (parse->priv->cache) {
2502 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
2503 gint cache_size = GST_BUFFER_SIZE (parse->priv->cache);
2505 if (cache_offset <= parse->priv->offset &&
2506 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
2507 *buffer = gst_buffer_create_sub (parse->priv->cache,
2508 parse->priv->offset - cache_offset, size);
2509 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2512 /* not enough data in the cache, free cache and get a new one */
2513 gst_buffer_unref (parse->priv->cache);
2514 parse->priv->cache = NULL;
2517 /* refill the cache */
2519 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
2520 64 * 1024), &parse->priv->cache);
2521 if (ret != GST_FLOW_OK) {
2522 parse->priv->cache = NULL;
2526 if (GST_BUFFER_SIZE (parse->priv->cache) >= size) {
2527 *buffer = gst_buffer_create_sub (parse->priv->cache, 0, size);
2528 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2532 /* Not possible to get enough data, try a last time with
2533 * requesting exactly the size we need */
2534 gst_buffer_unref (parse->priv->cache);
2535 parse->priv->cache = NULL;
2537 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
2538 &parse->priv->cache);
2540 if (ret != GST_FLOW_OK) {
2541 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
2546 if (GST_BUFFER_SIZE (parse->priv->cache) < size) {
2547 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
2548 G_GUINT64_FORMAT ": wanted %u bytes, got %u bytes", parse->priv->offset,
2549 size, GST_BUFFER_SIZE (parse->priv->cache));
2551 *buffer = parse->priv->cache;
2552 parse->priv->cache = NULL;
2557 *buffer = gst_buffer_create_sub (parse->priv->cache, 0, size);
2558 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
2563 static GstFlowReturn
2564 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
2567 GstClockTime ts = 0;
2571 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
2572 ", last_offset = %" G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->last_ts),
2573 parse->priv->last_offset);
2575 if (!parse->priv->last_offset || parse->priv->last_ts <= parse->segment.start) {
2576 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
2577 GST_TIME_ARGS (parse->segment.start));
2578 ret = GST_FLOW_UNEXPECTED;
2582 /* last fragment started at last_offset / last_ts;
2583 * seek back 10s capped at 1MB */
2584 if (parse->priv->last_ts >= 10 * GST_SECOND)
2585 ts = parse->priv->last_ts - 10 * GST_SECOND;
2586 /* if we are exact now, we will be more so going backwards */
2587 if (parse->priv->exact_position) {
2588 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
2590 GstFormat dstformat = GST_FORMAT_BYTES;
2592 if (!gst_pad_query_convert (parse->srcpad, GST_FORMAT_TIME, ts,
2593 &dstformat, &offset)) {
2594 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
2597 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
2598 parse->priv->last_offset - 1024);
2599 offset = MAX (0, offset);
2601 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
2603 parse->priv->offset = offset;
2605 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
2607 if (ret != GST_FLOW_OK)
2610 /* offset will increase again as fragment is processed/parsed */
2611 parse->priv->last_offset = offset;
2613 gst_adapter_push (parse->priv->adapter, buffer);
2614 ret = gst_base_parse_process_fragment (parse, FALSE);
2615 if (ret != GST_FLOW_OK)
2618 /* force previous fragment */
2619 parse->priv->offset = -1;
2626 * pull and scan for next frame starting from current offset
2627 * ajusts sync, drain and offset going along */
2628 static GstFlowReturn
2629 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass,
2630 GstBaseParseFrame * frame, gboolean full)
2632 GstBuffer *buffer, *outbuf;
2633 GstFlowReturn ret = GST_FLOW_OK;
2634 guint fsize = 1, min_size, old_min_size = 0;
2637 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2639 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
2640 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
2642 /* let's make this efficient for all subclass once and for all;
2643 * maybe it does not need this much, but in the latter case, we know we are
2644 * in pull mode here and might as well try to read and supply more anyway
2645 * (so does the buffer caching mechanism) */
2651 min_size = MAX (parse->priv->min_frame_size, fsize);
2652 /* loop safety check */
2653 if (G_UNLIKELY (old_min_size >= min_size))
2655 old_min_size = min_size;
2657 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
2658 if (ret != GST_FLOW_OK)
2661 if (parse->priv->discont) {
2662 GST_DEBUG_OBJECT (parse, "marking DISCONT");
2663 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
2666 /* if we got a short read, inform subclass we are draining leftover
2667 * and no more is to be expected */
2668 if (GST_BUFFER_SIZE (buffer) < min_size)
2669 parse->priv->drain = TRUE;
2671 if (parse->priv->detecting) {
2672 ret = klass->detect (parse, buffer);
2673 if (ret == GST_FLOW_NOT_NEGOTIATED) {
2674 /* If draining we error out, otherwise request a buffer
2676 if (parse->priv->drain) {
2677 gst_buffer_unref (buffer);
2678 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
2679 return GST_FLOW_ERROR;
2682 gst_buffer_unref (buffer);
2685 } else if (ret != GST_FLOW_OK) {
2686 gst_buffer_unref (buffer);
2687 GST_ERROR_OBJECT (parse, "detect() returned %s",
2688 gst_flow_get_name (ret));
2692 /* Else handle this buffer normally */
2696 gst_base_parse_frame_update (parse, frame, buffer);
2697 res = klass->check_valid_frame (parse, frame, &fsize, &skip);
2698 gst_buffer_replace (&frame->buffer, NULL);
2700 parse->priv->drain = FALSE;
2701 GST_LOG_OBJECT (parse, "valid frame of size %d at pos %d", fsize, skip);
2704 parse->priv->drain = FALSE;
2708 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
2709 if (full && parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2710 /* reverse playback, and no frames found yet, so we are skipping
2711 * the leading part of a fragment, which may form the tail of
2712 * fragment coming later, hopefully subclass skips efficiently ... */
2713 outbuf = gst_buffer_create_sub (buffer, 0, skip);
2714 parse->priv->buffers_pending =
2715 g_slist_prepend (parse->priv->buffers_pending, outbuf);
2718 parse->priv->offset += skip;
2719 if (!parse->priv->discont)
2720 parse->priv->sync_offset = parse->priv->offset;
2721 parse->priv->discont = TRUE;
2722 /* something changed at least; nullify loop check */
2723 if (fsize == G_MAXUINT)
2724 fsize = old_min_size + 64 * 1024;
2727 /* skip == 0 should imply subclass set min_size to need more data;
2728 * we check this shortly */
2729 GST_DEBUG_OBJECT (parse, "finding sync...");
2730 gst_buffer_unref (buffer);
2731 if ((ret = gst_base_parse_check_sync (parse)) != GST_FLOW_OK) {
2736 /* Does the subclass want to skip too? */
2738 parse->priv->offset += skip;
2742 if (fsize + skip <= GST_BUFFER_SIZE (buffer)) {
2743 outbuf = gst_buffer_create_sub (buffer, skip, fsize);
2744 GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer) + skip;
2745 GST_BUFFER_TIMESTAMP (outbuf) = GST_CLOCK_TIME_NONE;
2746 gst_buffer_unref (buffer);
2748 gst_buffer_unref (buffer);
2749 ret = gst_base_parse_pull_range (parse, fsize, &outbuf);
2750 if (ret != GST_FLOW_OK)
2752 if (GST_BUFFER_SIZE (outbuf) < fsize) {
2753 gst_buffer_unref (outbuf);
2754 ret = GST_FLOW_UNEXPECTED;
2758 parse->priv->offset += fsize;
2760 frame->buffer = outbuf;
2768 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2769 ("min_size evolution %d -> %d; breaking to avoid looping",
2770 old_min_size, min_size));
2771 return GST_FLOW_ERROR;
2775 /* Loop that is used in pull mode to retrieve data from upstream */
2777 gst_base_parse_loop (GstPad * pad)
2779 GstBaseParse *parse;
2780 GstBaseParseClass *klass;
2781 GstFlowReturn ret = GST_FLOW_OK;
2782 GstBaseParseFrame frame;
2784 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
2785 klass = GST_BASE_PARSE_GET_CLASS (parse);
2787 /* reverse playback:
2788 * first fragment (closest to stop time) is handled normally below,
2789 * then we pull in fragments going backwards */
2790 if (parse->segment.rate < 0.0) {
2791 /* check if we jumped back to a previous fragment,
2792 * which is a post-first fragment */
2793 if (parse->priv->offset < 0) {
2794 ret = gst_base_parse_handle_previous_fragment (parse);
2799 gst_base_parse_frame_init (&frame);
2800 ret = gst_base_parse_scan_frame (parse, klass, &frame, TRUE);
2801 if (ret != GST_FLOW_OK)
2804 /* This always cleans up frame, even if error occurs */
2805 ret = gst_base_parse_handle_and_push_frame (parse, klass, &frame);
2807 /* eat expected eos signalling past segment in reverse playback */
2808 if (parse->segment.rate < 0.0 && ret == GST_FLOW_UNEXPECTED &&
2809 parse->segment.last_stop >= parse->segment.stop) {
2810 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
2811 /* push what was accumulated during loop run */
2812 gst_base_parse_process_fragment (parse, TRUE);
2813 /* force previous fragment */
2814 parse->priv->offset = -1;
2819 if (ret == GST_FLOW_UNEXPECTED)
2821 else if (ret != GST_FLOW_OK)
2824 gst_object_unref (parse);
2830 ret = GST_FLOW_UNEXPECTED;
2831 GST_DEBUG_OBJECT (parse, "eos");
2836 gboolean push_eos = FALSE;
2838 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
2839 gst_flow_get_name (ret));
2840 gst_pad_pause_task (parse->sinkpad);
2842 if (ret == GST_FLOW_UNEXPECTED) {
2843 /* handle end-of-stream/segment */
2844 if (parse->segment.flags & GST_SEEK_FLAG_SEGMENT) {
2847 if ((stop = parse->segment.stop) == -1)
2848 stop = parse->segment.duration;
2850 GST_DEBUG_OBJECT (parse, "sending segment_done");
2852 gst_element_post_message
2853 (GST_ELEMENT_CAST (parse),
2854 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
2855 GST_FORMAT_TIME, stop));
2857 /* If we STILL have zero frames processed, fire an error */
2858 if (parse->priv->framecount == 0) {
2859 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
2860 ("No valid frames found before end of stream"), (NULL));
2864 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_UNEXPECTED) {
2865 /* for fatal errors we post an error message, wrong-state is
2866 * not fatal because it happens due to flushes and only means
2867 * that we should stop now. */
2868 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
2869 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
2873 /* Push pending events, including NEWSEGMENT events */
2874 if (G_UNLIKELY (parse->priv->pending_events)) {
2877 for (l = parse->priv->pending_events; l != NULL; l = l->next) {
2878 gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
2880 g_list_free (parse->priv->pending_events);
2881 parse->priv->pending_events = NULL;
2882 parse->priv->pending_segment = FALSE;
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);
2983 event = gst_event_new_new_segment (FALSE,
2984 parse->segment.rate, parse->segment.format,
2985 parse->segment.start, parse->segment.stop, parse->segment.last_stop);
2986 parse->priv->pending_events =
2987 g_list_append (parse->priv->pending_events, event);
2988 parse->priv->pending_segment = TRUE;
2991 gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop,
2994 result &= gst_pad_stop_task (sinkpad);
2999 parse->priv->pad_mode = active ? GST_ACTIVATE_PULL : GST_ACTIVATE_NONE;
3001 GST_DEBUG_OBJECT (parse, "sink activate pull return: %d", result);
3003 gst_object_unref (parse);
3009 * gst_base_parse_set_duration:
3010 * @parse: #GstBaseParse.
3012 * @duration: duration value.
3013 * @interval: how often to update the duration estimate based on bitrate, or 0.
3015 * Sets the duration of the currently playing media. Subclass can use this
3016 * when it is able to determine duration and/or notices a change in the media
3017 * duration. Alternatively, if @interval is non-zero (default), then stream
3018 * duration is determined based on estimated bitrate, and updated every @interval
3024 gst_base_parse_set_duration (GstBaseParse * parse,
3025 GstFormat fmt, gint64 duration, gint interval)
3027 g_return_if_fail (parse != NULL);
3029 if (parse->priv->upstream_has_duration) {
3030 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3034 if (duration != parse->priv->duration) {
3037 m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
3038 gst_element_post_message (GST_ELEMENT (parse), m);
3040 /* TODO: what about duration tag? */
3042 parse->priv->duration = duration;
3043 parse->priv->duration_fmt = fmt;
3044 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3045 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3046 if (interval != 0) {
3047 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3051 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3052 parse->priv->update_interval = interval;
3058 * gst_base_parse_set_average_bitrate:
3059 * @parse: #GstBaseParse.
3060 * @bitrate: average bitrate in bits/second
3062 * Optionally sets the average bitrate detected in media (if non-zero),
3063 * e.g. based on metadata, as it will be posted to the application.
3065 * By default, announced average bitrate is estimated. The average bitrate
3066 * is used to estimate the total duration of the stream and to estimate
3067 * a seek position, if there's no index and the format is syncable
3068 * (see gst_base_parse_set_syncable()).
3073 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3075 parse->priv->bitrate = bitrate;
3076 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3080 * gst_base_parse_set_min_frame_size:
3081 * @parse: #GstBaseParse.
3082 * @min_size: Minimum size of the data that this base class should give to
3085 * Subclass can use this function to tell the base class that it needs to
3086 * give at least #min_size buffers.
3091 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3093 g_return_if_fail (parse != NULL);
3095 parse->priv->min_frame_size = min_size;
3096 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3100 * gst_base_parse_set_frame_rate:
3101 * @parse: the #GstBaseParse to set
3102 * @fps_num: frames per second (numerator).
3103 * @fps_den: frames per second (denominator).
3104 * @lead_in: frames needed before a segment for subsequent decode
3105 * @lead_out: frames needed after a segment
3107 * If frames per second is configured, parser can take care of buffer duration
3108 * and timestamping. When performing segment clipping, or seeking to a specific
3109 * location, a corresponding decoder might need an initial @lead_in and a
3110 * following @lead_out number of frames to ensure the desired segment is
3111 * entirely filled upon decoding.
3116 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3117 guint fps_den, guint lead_in, guint lead_out)
3119 g_return_if_fail (parse != NULL);
3121 parse->priv->fps_num = fps_num;
3122 parse->priv->fps_den = fps_den;
3123 if (!fps_num || !fps_den) {
3124 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3126 fps_num = fps_den = 0;
3127 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3128 parse->priv->lead_in = parse->priv->lead_out = 0;
3129 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3131 parse->priv->frame_duration =
3132 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3133 parse->priv->lead_in = lead_in;
3134 parse->priv->lead_out = lead_out;
3135 parse->priv->lead_in_ts =
3136 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3137 parse->priv->lead_out_ts =
3138 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3139 /* aim for about 1.5s to estimate duration */
3140 if (parse->priv->update_interval < 0) {
3141 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3142 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3143 parse->priv->update_interval);
3146 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3147 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3148 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3149 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3150 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3151 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3155 * gst_base_parse_set_has_timing_info:
3156 * @parse: a #GstBaseParse
3157 * @has_timing: whether frames carry timing information
3159 * Set if frames carry timing information which the subclass can (generally)
3160 * parse and provide. In particular, intrinsic (rather than estimated) time
3161 * can be obtained following a seek.
3166 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3168 parse->priv->has_timing_info = has_timing;
3169 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3173 * gst_base_parse_set_syncable:
3174 * @parse: a #GstBaseParse
3175 * @syncable: set if frame starts can be identified
3177 * Set if frame starts can be identified. This is set by default and
3178 * determines whether seeking based on bitrate averages
3179 * is possible for a format/stream.
3184 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3186 parse->priv->syncable = syncable;
3187 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3191 * gst_base_parse_set_passthrough:
3192 * @parse: a #GstBaseParse
3193 * @passthrough: %TRUE if parser should run in passthrough mode
3195 * Set if the nature of the format or configuration does not allow (much)
3196 * parsing, and the parser should operate in passthrough mode (which only
3197 * applies when operating in push mode). That is, incoming buffers are
3198 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3199 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3200 * so subclass can perform as much or as little is appropriate for
3201 * passthrough semantics in @pre_push_frame.
3206 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3208 parse->priv->passthrough = passthrough;
3209 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3213 * gst_base_parse_set_latency:
3214 * @parse: a #GstBaseParse
3215 * @min_latency: minimum parse latency
3216 * @max_latency: maximum parse latency
3218 * Sets the minimum and maximum (which may likely be equal) latency introduced
3219 * by the parsing process. If there is such a latency, which depends on the
3220 * particular parsing of the format, it typically corresponds to 1 frame duration.
3225 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3226 GstClockTime max_latency)
3228 GST_OBJECT_LOCK (parse);
3229 parse->priv->min_latency = min_latency;
3230 parse->priv->max_latency = max_latency;
3231 GST_OBJECT_UNLOCK (parse);
3232 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3233 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3234 GST_TIME_ARGS (max_latency));
3238 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3239 GstClockTime * duration)
3241 gboolean res = FALSE;
3243 g_return_val_if_fail (duration != NULL, FALSE);
3245 *duration = GST_CLOCK_TIME_NONE;
3246 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3247 GST_LOG_OBJECT (parse, "using provided duration");
3248 *duration = parse->priv->duration;
3250 } else if (parse->priv->duration != -1) {
3251 GST_LOG_OBJECT (parse, "converting provided duration");
3252 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3253 parse->priv->duration, format, (gint64 *) duration);
3254 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3255 GST_LOG_OBJECT (parse, "using estimated duration");
3256 *duration = parse->priv->estimated_duration;
3260 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3261 GST_TIME_ARGS (*duration));
3265 static const GstQueryType *
3266 gst_base_parse_get_querytypes (GstPad * pad)
3268 static const GstQueryType list[] = {
3281 gst_base_parse_query (GstPad * pad, GstQuery * query)
3283 GstBaseParse *parse;
3284 gboolean res = FALSE;
3286 parse = GST_BASE_PARSE (GST_PAD_PARENT (pad));
3288 GST_LOG_OBJECT (parse, "handling query: %" GST_PTR_FORMAT, query);
3290 switch (GST_QUERY_TYPE (query)) {
3291 case GST_QUERY_POSITION:
3296 GST_DEBUG_OBJECT (parse, "position query");
3297 gst_query_parse_position (query, &format, NULL);
3299 /* try upstream first */
3300 res = gst_pad_query_default (pad, query);
3302 /* Fall back on interpreting segment */
3303 GST_OBJECT_LOCK (parse);
3304 if (format == GST_FORMAT_BYTES) {
3305 dest_value = parse->priv->offset;
3307 } else if (format == parse->segment.format &&
3308 GST_CLOCK_TIME_IS_VALID (parse->segment.last_stop)) {
3309 dest_value = gst_segment_to_stream_time (&parse->segment,
3310 parse->segment.format, parse->segment.last_stop);
3313 GST_OBJECT_UNLOCK (parse);
3315 /* no precise result, upstream no idea either, then best estimate */
3316 /* priv->offset is updated in both PUSH/PULL modes */
3317 res = gst_base_parse_convert (parse,
3318 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3321 gst_query_set_position (query, format, dest_value);
3325 case GST_QUERY_DURATION:
3328 GstClockTime duration;
3330 GST_DEBUG_OBJECT (parse, "duration query");
3331 gst_query_parse_duration (query, &format, NULL);
3333 /* consult upstream */
3334 res = gst_pad_query_default (pad, query);
3336 /* otherwise best estimate from us */
3338 res = gst_base_parse_get_duration (parse, format, &duration);
3340 gst_query_set_duration (query, format, duration);
3344 case GST_QUERY_SEEKING:
3347 GstClockTime duration = GST_CLOCK_TIME_NONE;
3348 gboolean seekable = FALSE;
3350 GST_DEBUG_OBJECT (parse, "seeking query");
3351 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3353 /* consult upstream */
3354 res = gst_pad_query_default (pad, query);
3356 /* we may be able to help if in TIME */
3357 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3358 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3359 /* already OK if upstream takes care */
3360 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3362 if (!(res && seekable)) {
3363 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3364 || duration == -1) {
3365 /* seekable if we still have a chance to get duration later on */
3367 parse->priv->upstream_seekable && parse->priv->update_interval;
3369 seekable = parse->priv->upstream_seekable;
3370 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3373 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3379 case GST_QUERY_FORMATS:
3380 gst_query_set_formatsv (query, 3, fmtlist);
3383 case GST_QUERY_CONVERT:
3385 GstFormat src_format, dest_format;
3386 gint64 src_value, dest_value;
3388 gst_query_parse_convert (query, &src_format, &src_value,
3389 &dest_format, &dest_value);
3391 res = gst_base_parse_convert (parse, src_format, src_value,
3392 dest_format, &dest_value);
3394 gst_query_set_convert (query, src_format, src_value,
3395 dest_format, dest_value);
3399 case GST_QUERY_LATENCY:
3401 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3403 GstClockTime min_latency, max_latency;
3405 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3406 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3407 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3408 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3410 GST_OBJECT_LOCK (parse);
3411 /* add our latency */
3412 if (min_latency != -1)
3413 min_latency += parse->priv->min_latency;
3414 if (max_latency != -1)
3415 max_latency += parse->priv->max_latency;
3416 GST_OBJECT_UNLOCK (parse);
3418 gst_query_set_latency (query, live, min_latency, max_latency);
3423 res = gst_pad_query_default (pad, query);
3429 /* scans for a cluster start from @pos,
3430 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3431 static GstFlowReturn
3432 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3433 GstClockTime * time, GstClockTime * duration)
3435 GstBaseParseClass *klass;
3437 gboolean orig_drain, orig_discont;
3438 GstFlowReturn ret = GST_FLOW_OK;
3439 GstBuffer *buf = NULL;
3440 GstBaseParseFrame frame;
3442 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3443 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3444 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3446 klass = GST_BASE_PARSE_GET_CLASS (parse);
3448 *time = GST_CLOCK_TIME_NONE;
3449 *duration = GST_CLOCK_TIME_NONE;
3452 orig_offset = parse->priv->offset;
3453 orig_discont = parse->priv->discont;
3454 orig_drain = parse->priv->drain;
3456 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
3457 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
3459 gst_base_parse_frame_init (&frame);
3461 /* jump elsewhere and locate next frame */
3462 parse->priv->offset = *pos;
3463 ret = gst_base_parse_scan_frame (parse, klass, &frame, FALSE);
3464 if (ret != GST_FLOW_OK)
3468 GST_LOG_OBJECT (parse,
3469 "peek parsing frame at offset %" G_GUINT64_FORMAT
3470 " (%#" G_GINT64_MODIFIER "x) of size %d",
3471 GST_BUFFER_OFFSET (buf), GST_BUFFER_OFFSET (buf), GST_BUFFER_SIZE (buf));
3473 /* get offset first, subclass parsing might dump other stuff in there */
3474 *pos = GST_BUFFER_OFFSET (buf);
3475 ret = klass->parse_frame (parse, &frame);
3478 /* but it should provide proper time */
3479 *time = GST_BUFFER_TIMESTAMP (buf);
3480 *duration = GST_BUFFER_DURATION (buf);
3482 gst_base_parse_frame_free (&frame);
3484 GST_LOG_OBJECT (parse,
3485 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
3486 GST_TIME_ARGS (*time), *pos);
3490 parse->priv->offset = orig_offset;
3491 parse->priv->discont = orig_discont;
3492 parse->priv->drain = orig_drain;
3497 /* bisect and scan through file for frame starting before @time,
3498 * returns OK and @time/@offset if found, NONE and/or error otherwise
3499 * If @time == G_MAXINT64, scan for duration ( == last frame) */
3500 static GstFlowReturn
3501 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
3504 GstFlowReturn ret = GST_FLOW_OK;
3505 gint64 lpos, hpos, newpos;
3506 GstClockTime time, ltime, htime, newtime, dur;
3507 gboolean cont = TRUE;
3508 const GstClockTime tolerance = TARGET_DIFFERENCE;
3509 const guint chunk = 4 * 1024;
3511 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
3512 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
3514 GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
3515 GST_TIME_ARGS (*_time));
3517 /* TODO also make keyframe aware if useful some day */
3532 /* do not know at first */
3534 *_time = GST_CLOCK_TIME_NONE;
3536 /* need initial positions; start and end */
3537 lpos = parse->priv->first_frame_offset;
3538 ltime = parse->priv->first_frame_ts;
3539 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
3540 GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
3541 return GST_FLOW_ERROR;
3543 hpos = parse->priv->upstream_size;
3545 GST_DEBUG_OBJECT (parse,
3546 "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
3547 ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, htime,
3548 GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
3550 /* check preconditions are satisfied;
3551 * start and end are needed, except for special case where we scan for
3552 * last frame to determine duration */
3553 if (parse->priv->pad_mode != GST_ACTIVATE_PULL || !hpos ||
3554 !GST_CLOCK_TIME_IS_VALID (ltime) ||
3555 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
3559 /* shortcut cases */
3562 } else if (time < ltime + tolerance) {
3566 } else if (time >= htime) {
3572 while (htime > ltime && cont) {
3573 GST_LOG_OBJECT (parse,
3574 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
3575 GST_TIME_ARGS (ltime));
3576 GST_LOG_OBJECT (parse,
3577 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
3578 GST_TIME_ARGS (htime));
3579 if (G_UNLIKELY (time == G_MAXINT64)) {
3581 } else if (G_LIKELY (hpos > lpos)) {
3583 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
3586 /* should mean lpos == hpos, since lpos <= hpos is invariant */
3588 /* we check this case once, but not forever, so break loop */
3593 newpos = CLAMP (newpos, lpos, hpos);
3594 GST_LOG_OBJECT (parse,
3595 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
3596 GST_TIME_ARGS (time), newpos);
3598 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
3599 if (ret == GST_FLOW_UNEXPECTED) {
3600 /* heuristic HACK */
3601 hpos = MAX (lpos, hpos - chunk);
3603 } else if (ret != GST_FLOW_OK) {
3607 if (newtime == -1 || newpos == -1) {
3608 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
3612 if (G_UNLIKELY (time == G_MAXINT64)) {
3615 if (GST_CLOCK_TIME_IS_VALID (dur))
3618 } else if (newtime > time) {
3620 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
3622 } else if (newtime + tolerance > time) {
3623 /* close enough undershoot */
3627 } else if (newtime < ltime) {
3628 /* so a position beyond lpos resulted in earlier time than ltime ... */
3629 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
3632 /* undershoot too far */
3633 newpos += newpos == lpos ? chunk : 0;
3634 lpos = CLAMP (newpos, lpos, hpos);
3640 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
3641 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
3646 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
3647 gboolean before, GstClockTime * _ts)
3649 gint64 bytes = 0, ts = 0;
3650 GstIndexEntry *entry = NULL;
3652 if (time == GST_CLOCK_TIME_NONE) {
3658 GST_BASE_PARSE_INDEX_LOCK (parse);
3659 if (parse->priv->index) {
3660 /* Let's check if we have an index entry for that time */
3661 entry = gst_index_get_assoc_entry (parse->priv->index,
3662 parse->priv->index_id,
3663 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
3664 GST_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
3668 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
3669 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
3671 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
3672 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
3673 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
3675 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
3676 GST_TIME_ARGS (time));
3679 ts = GST_CLOCK_TIME_NONE;
3682 GST_BASE_PARSE_INDEX_UNLOCK (parse);
3691 /* returns TRUE if seek succeeded */
3693 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
3698 GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
3699 gboolean flush, update, res = TRUE, accurate;
3700 gint64 cur, stop, seekpos, seekstop;
3701 GstSegment seeksegment = { 0, };
3702 GstFormat dstformat;
3703 GstClockTime start_ts;
3705 gst_event_parse_seek (event, &rate, &format, &flags,
3706 &cur_type, &cur, &stop_type, &stop);
3708 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
3709 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
3710 GST_TIME_FORMAT, gst_format_get_name (format), rate,
3711 cur_type, GST_TIME_ARGS (cur), stop_type, GST_TIME_ARGS (stop));
3713 /* no negative rates in push mode */
3714 if (rate < 0.0 && parse->priv->pad_mode == GST_ACTIVATE_PUSH)
3717 if (cur_type != GST_SEEK_TYPE_SET ||
3718 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
3721 /* For any format other than TIME, see if upstream handles
3722 * it directly or fail. For TIME, try upstream, but do it ourselves if
3723 * it fails upstream */
3724 if (format != GST_FORMAT_TIME) {
3725 /* default action delegates to upstream */
3729 gst_event_ref (event);
3730 if ((res = gst_pad_push_event (parse->sinkpad, event))) {
3735 /* get flush flag */
3736 flush = flags & GST_SEEK_FLAG_FLUSH;
3738 /* copy segment, we need this because we still need the old
3739 * segment when we close the current segment. */
3740 memcpy (&seeksegment, &parse->segment, sizeof (GstSegment));
3742 GST_DEBUG_OBJECT (parse, "configuring seek");
3743 gst_segment_set_seek (&seeksegment, rate, format, flags,
3744 cur_type, cur, stop_type, stop, &update);
3746 /* accurate seeking implies seek tables are used to obtain position,
3747 * and the requested segment is maintained exactly, not adjusted any way */
3748 accurate = flags & GST_SEEK_FLAG_ACCURATE;
3750 /* maybe we can be accurate for (almost) free */
3751 gst_base_parse_find_offset (parse, seeksegment.last_stop, TRUE, &start_ts);
3752 if (seeksegment.last_stop <= start_ts + TARGET_DIFFERENCE) {
3753 GST_DEBUG_OBJECT (parse, "accurate seek possible");
3757 GstClockTime startpos = seeksegment.last_stop;
3759 /* accurate requested, so ... seek a bit before target */
3760 if (startpos < parse->priv->lead_in_ts)
3763 startpos -= parse->priv->lead_in_ts;
3764 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
3765 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
3768 start_ts = seeksegment.last_stop;
3769 dstformat = GST_FORMAT_BYTES;
3770 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.last_stop,
3771 &dstformat, &seekpos))
3772 goto convert_failed;
3773 if (!gst_pad_query_convert (parse->srcpad, format, seeksegment.stop,
3774 &dstformat, &seekstop))
3775 goto convert_failed;
3778 GST_DEBUG_OBJECT (parse,
3779 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3781 GST_DEBUG_OBJECT (parse,
3782 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
3783 seeksegment.stop, seekstop);
3785 if (parse->priv->pad_mode == GST_ACTIVATE_PULL) {
3788 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
3791 if (parse->srcpad) {
3792 GST_DEBUG_OBJECT (parse, "sending flush start");
3793 gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
3794 /* unlock upstream pull_range */
3795 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_start ());
3798 gst_pad_pause_task (parse->sinkpad);
3801 /* we should now be able to grab the streaming thread because we stopped it
3802 * with the above flush/pause code */
3803 GST_PAD_STREAM_LOCK (parse->sinkpad);
3805 /* save current position */
3806 last_stop = parse->segment.last_stop;
3807 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
3810 /* now commit to new position */
3812 /* prepare for streaming again */
3814 GST_DEBUG_OBJECT (parse, "sending flush stop");
3815 gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop ());
3816 gst_pad_push_event (parse->sinkpad, gst_event_new_flush_stop ());
3817 gst_base_parse_clear_queues (parse);
3819 if (parse->priv->close_segment)
3820 gst_event_unref (parse->priv->close_segment);
3822 parse->priv->close_segment = gst_event_new_new_segment (TRUE,
3823 parse->segment.rate, parse->segment.format,
3824 parse->segment.accum, parse->segment.last_stop, parse->segment.accum);
3826 /* keep track of our last_stop */
3827 seeksegment.accum = parse->segment.last_stop;
3829 GST_DEBUG_OBJECT (parse, "Created close seg format %d, "
3830 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3831 ", pos = %" GST_TIME_FORMAT, format,
3832 GST_TIME_ARGS (parse->segment.accum),
3833 GST_TIME_ARGS (parse->segment.last_stop),
3834 GST_TIME_ARGS (parse->segment.accum));
3837 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
3839 /* store the newsegment event so it can be sent from the streaming thread. */
3840 parse->priv->pending_segment = TRUE;
3841 parse->priv->pending_events = g_list_append (parse->priv->pending_events,
3842 gst_event_new_new_segment (FALSE, parse->segment.rate,
3843 parse->segment.format, parse->segment.start,
3844 parse->segment.stop, parse->segment.start));
3846 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
3847 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
3848 ", pos = %" GST_TIME_FORMAT, format,
3849 GST_TIME_ARGS (parse->segment.start),
3850 GST_TIME_ARGS (parse->segment.stop),
3851 GST_TIME_ARGS (parse->segment.start));
3853 /* one last chance in pull mode to stay accurate;
3854 * maybe scan and subclass can find where to go */
3857 GstClockTime ts = seeksegment.last_stop;
3859 gst_base_parse_locate_time (parse, &ts, &scanpos);
3863 /* running collected index now consists of several intervals,
3864 * so optimized check no longer possible */
3865 parse->priv->index_last_valid = FALSE;
3866 parse->priv->index_last_offset = 0;
3867 parse->priv->index_last_ts = 0;
3871 /* mark discont if we are going to stream from another position. */
3872 if (seekpos != parse->priv->offset) {
3873 GST_DEBUG_OBJECT (parse,
3874 "mark DISCONT, we did a seek to another position");
3875 parse->priv->offset = seekpos;
3876 parse->priv->last_offset = seekpos;
3877 parse->priv->seen_keyframe = FALSE;
3878 parse->priv->discont = TRUE;
3879 parse->priv->next_ts = start_ts;
3880 parse->priv->last_ts = GST_CLOCK_TIME_NONE;
3881 parse->priv->sync_offset = seekpos;
3882 parse->priv->exact_position = accurate;
3885 /* Start streaming thread if paused */
3886 gst_pad_start_task (parse->sinkpad,
3887 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
3889 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3894 GstEvent *new_event;
3895 GstBaseParseSeek *seek;
3896 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
3898 /* The only thing we need to do in PUSH-mode is to send the
3899 seek event (in bytes) to upstream. Segment / flush handling happens
3900 in corresponding src event handlers */
3901 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
3902 if (seekstop >= 0 && seekstop <= seekpos)
3904 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
3905 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
3907 /* store segment info so its precise details can be reconstructed when
3908 * receiving newsegment;
3909 * this matters for all details when accurate seeking,
3910 * is most useful to preserve NONE stop time otherwise */
3911 seek = g_new0 (GstBaseParseSeek, 1);
3912 seek->segment = seeksegment;
3913 seek->accurate = accurate;
3914 seek->offset = seekpos;
3915 seek->start_ts = start_ts;
3916 GST_OBJECT_LOCK (parse);
3917 /* less optimal, but preserves order */
3918 parse->priv->pending_seeks =
3919 g_slist_append (parse->priv->pending_seeks, seek);
3920 GST_OBJECT_UNLOCK (parse);
3922 res = gst_pad_push_event (parse->sinkpad, new_event);
3925 GST_OBJECT_LOCK (parse);
3926 parse->priv->pending_seeks =
3927 g_slist_remove (parse->priv->pending_seeks, seek);
3928 GST_OBJECT_UNLOCK (parse);
3934 /* handled event is ours to free */
3936 gst_event_unref (event);
3942 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
3948 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
3954 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
3960 /* Checks if bitrates are available from upstream tags so that we don't
3961 * override them later
3964 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
3966 GstTagList *taglist = NULL;
3969 gst_event_parse_tag (event, &taglist);
3971 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
3972 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
3973 parse->priv->post_min_bitrate = FALSE;
3975 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
3976 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
3977 parse->priv->post_avg_bitrate = FALSE;
3979 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
3980 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
3981 parse->priv->post_max_bitrate = FALSE;
3986 gst_base_parse_sink_setcaps (GstPad * pad, GstCaps * caps)
3988 GstBaseParse *parse;
3989 GstBaseParseClass *klass;
3990 gboolean res = TRUE;
3992 parse = GST_BASE_PARSE (GST_PAD_PARENT (pad));
3993 klass = GST_BASE_PARSE_GET_CLASS (parse);
3995 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
3997 if (klass->set_sink_caps)
3998 res = klass->set_sink_caps (parse, caps);
4004 gst_base_parse_sink_getcaps (GstPad * pad)
4006 GstBaseParse *parse;
4007 GstBaseParseClass *klass;
4010 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
4011 klass = GST_BASE_PARSE_GET_CLASS (parse);
4012 g_assert (pad == GST_BASE_PARSE_SINK_PAD (parse));
4014 if (klass->get_sink_caps)
4015 caps = klass->get_sink_caps (parse);
4017 caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
4018 gst_object_unref (parse);
4020 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT, caps);
4026 gst_base_parse_set_index (GstElement * element, GstIndex * index)
4028 GstBaseParse *parse = GST_BASE_PARSE (element);
4030 GST_BASE_PARSE_INDEX_LOCK (parse);
4031 if (parse->priv->index)
4032 gst_object_unref (parse->priv->index);
4034 parse->priv->index = gst_object_ref (index);
4035 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4036 &parse->priv->index_id);
4037 parse->priv->own_index = FALSE;
4039 parse->priv->index = NULL;
4041 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4045 gst_base_parse_get_index (GstElement * element)
4047 GstBaseParse *parse = GST_BASE_PARSE (element);
4048 GstIndex *result = NULL;
4050 GST_BASE_PARSE_INDEX_LOCK (parse);
4051 if (parse->priv->index)
4052 result = gst_object_ref (parse->priv->index);
4053 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4058 static GstStateChangeReturn
4059 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4061 GstBaseParse *parse;
4062 GstStateChangeReturn result;
4064 parse = GST_BASE_PARSE (element);
4066 switch (transition) {
4067 case GST_STATE_CHANGE_READY_TO_PAUSED:
4068 /* If this is our own index destroy it as the
4069 * old entries might be wrong for the new stream */
4070 GST_BASE_PARSE_INDEX_LOCK (parse);
4071 if (parse->priv->own_index) {
4072 gst_object_unref (parse->priv->index);
4073 parse->priv->index = NULL;
4074 parse->priv->own_index = FALSE;
4077 /* If no index was created, generate one */
4078 if (G_UNLIKELY (!parse->priv->index)) {
4079 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4081 parse->priv->index = gst_index_factory_make ("memindex");
4082 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4083 &parse->priv->index_id);
4084 parse->priv->own_index = TRUE;
4086 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4092 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4094 switch (transition) {
4095 case GST_STATE_CHANGE_PAUSED_TO_READY:
4096 gst_base_parse_reset (parse);