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., 51 Franklin St, Fifth Floor,
21 * Boston, MA 02110-1301, 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 (SEGMENT/EOS/FLUSH)</para></listitem>
40 * handles queries (POSITION/DURATION/SEEKING/FORMAT/CONVERT)
42 * <listitem><para>handles flushing</para></listitem>
45 * The purpose of this base class is to provide the basic functionality of
46 * a parser and share a lot of rather complex code.
48 * Description of the parsing mechanism:
51 * <itemizedlist><title>Set-up phase</title>
53 * #GstBaseParse calls @start to inform subclass that data processing is
57 * #GstBaseParse class calls @set_sink_caps to inform the subclass about
58 * incoming sinkpad caps. Subclass could already set the srcpad caps
59 * accordingly, but this might be delayed until calling
60 * gst_base_parse_finish_frame() with a non-queued frame.
63 * At least at this point subclass needs to tell the #GstBaseParse class
64 * how big data chunks it wants to receive (min_frame_size). It can do
65 * this with gst_base_parse_set_min_frame_size().
68 * #GstBaseParse class sets up appropriate data passing mode (pull/push)
69 * and starts to process the data.
75 * <title>Parsing phase</title>
77 * #GstBaseParse gathers at least min_frame_size bytes of data either
78 * by pulling it from upstream or collecting buffers in an internal
82 * A buffer of (at least) min_frame_size bytes is passed to subclass with
83 * @handle_frame. Subclass checks the contents and can optionally
84 * return GST_FLOW_OK along with an amount of data to be skipped to find
85 * a valid frame (which will result in a subsequent DISCONT).
86 * If, otherwise, the buffer does not hold a complete frame,
87 * @handle_frame can merely return and will be called again when additional
88 * data is available. In push mode this amounts to an
89 * additional input buffer (thus minimal additional latency), in pull mode
90 * this amounts to some arbitrary reasonable buffer size increase.
91 * Of course, gst_base_parse_set_min_frame_size() could also be used if a
92 * very specific known amount of additional data is required.
93 * If, however, the buffer holds a complete valid frame, it can pass
94 * the size of this frame to gst_base_parse_finish_frame().
95 * If acting as a converter, it can also merely indicate consumed input data
96 * while simultaneously providing custom output data.
97 * Note that baseclass performs some processing (such as tracking
98 * overall consumed data rate versus duration) for each finished frame,
99 * but other state is only updated upon each call to @handle_frame
100 * (such as tracking upstream input timestamp).
102 * Subclass is also responsible for setting the buffer metadata
103 * (e.g. buffer timestamp and duration, or keyframe if applicable).
104 * (although the latter can also be done by #GstBaseParse if it is
105 * appropriately configured, see below). Frame is provided with
106 * timestamp derived from upstream (as much as generally possible),
107 * duration obtained from configuration (see below), and offset
108 * if meaningful (in pull mode).
110 * Note that @check_valid_frame might receive any small
111 * amount of input data when leftover data is being drained (e.g. at EOS).
114 * As part of finish frame processing,
115 * just prior to actually pushing the buffer in question,
116 * it is passed to @pre_push_frame which gives subclass yet one
117 * last chance to examine buffer metadata, or to send some custom (tag)
118 * events, or to perform custom (segment) filtering.
121 * During the parsing process #GstBaseParseClass will handle both srcpad
122 * and sinkpad events. They will be passed to subclass if @event or
123 * @src_event callbacks have been provided.
128 * <itemizedlist><title>Shutdown phase</title>
130 * #GstBaseParse class calls @stop to inform the subclass that data
131 * parsing will be stopped.
137 * Subclass is responsible for providing pad template caps for
138 * source and sink pads. The pads need to be named "sink" and "src". It also
139 * needs to set the fixed caps on srcpad, when the format is ensured (e.g.
140 * when base class calls subclass' @set_sink_caps function).
142 * This base class uses %GST_FORMAT_DEFAULT as a meaning of frames. So,
143 * subclass conversion routine needs to know that conversion from
144 * %GST_FORMAT_TIME to %GST_FORMAT_DEFAULT must return the
145 * frame number that can be found from the given byte position.
147 * #GstBaseParse uses subclasses conversion methods also for seeking (or
148 * otherwise uses its own default one, see also below).
150 * Subclass @start and @stop functions will be called to inform the beginning
151 * and end of data processing.
153 * Things that subclass need to take care of:
155 * <listitem><para>Provide pad templates</para></listitem>
157 * Fixate the source pad caps when appropriate
160 * Inform base class how big data chunks should be retrieved. This is
161 * done with gst_base_parse_set_min_frame_size() function.
164 * Examine data chunks passed to subclass with @handle_frame and pass
165 * proper frame(s) to gst_base_parse_finish_frame(), and setting src pad
166 * caps and timestamps on frame.
168 * <listitem><para>Provide conversion functions</para></listitem>
170 * Update the duration information with gst_base_parse_set_duration()
173 * Optionally passthrough using gst_base_parse_set_passthrough()
176 * Configure various baseparse parameters using
177 * gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
178 * and gst_base_parse_set_frame_rate().
181 * In particular, if subclass is unable to determine a duration, but
182 * parsing (or specs) yields a frames per seconds rate, then this can be
183 * provided to #GstBaseParse to enable it to cater for
184 * buffer time metadata (which will be taken from upstream as much as
185 * possible). Internally keeping track of frame durations and respective
186 * sizes that have been pushed provides #GstBaseParse with an estimated
187 * bitrate. A default @convert (used if not overridden) will then use these
188 * rates to perform obvious conversions. These rates are also used to
189 * update (estimated) duration at regular frame intervals.
196 * - In push mode provide a queue of adapter-"queued" buffers for upstream
198 * - Queue buffers/events until caps are set
208 #include <gst/base/gstadapter.h>
210 #include "gstbaseparse.h"
212 /* FIXME: get rid of old GstIndex code */
213 #include "gstindex.h"
214 #include "gstindex.c"
215 #include "gstmemindex.c"
217 #define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
219 #define MIN_FRAMES_TO_POST_BITRATE 10
220 #define TARGET_DIFFERENCE (20 * GST_SECOND)
221 #define MAX_INDEX_ENTRIES 4096
223 GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
224 #define GST_CAT_DEFAULT gst_base_parse_debug
226 /* Supported formats */
227 static const GstFormat fmtlist[] = {
234 #define GST_BASE_PARSE_GET_PRIVATE(obj) \
235 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
237 struct _GstBaseParsePrivate
244 GstFormat duration_fmt;
245 gint64 estimated_duration;
246 gint64 estimated_drift;
248 guint min_frame_size;
249 gboolean disable_passthrough;
250 gboolean passthrough;
251 gboolean pts_interpolate;
254 gboolean has_timing_info;
255 guint fps_num, fps_den;
256 gint update_interval;
258 guint lead_in, lead_out;
259 GstClockTime lead_in_ts, lead_out_ts;
260 GstClockTime min_latency, max_latency;
269 GstClockTime next_pts;
270 GstClockTime next_dts;
271 GstClockTime prev_pts;
272 GstClockTime prev_dts;
273 GstClockTime frame_duration;
274 gboolean seen_keyframe;
280 guint64 data_bytecount;
281 guint64 acc_duration;
282 GstClockTime first_frame_pts;
283 GstClockTime first_frame_dts;
284 gint64 first_frame_offset;
286 gboolean post_min_bitrate;
287 gboolean post_avg_bitrate;
288 gboolean post_max_bitrate;
292 guint posted_avg_bitrate;
294 /* frames/buffers that are queued and ready to go on OK */
295 GQueue queued_frames;
299 /* index entry storage, either ours or provided */
305 /* seek table entries only maintained if upstream is BYTE seekable */
306 gboolean upstream_seekable;
307 gboolean upstream_has_duration;
308 gint64 upstream_size;
309 GstFormat upstream_format;
310 /* minimum distance between two index entries */
311 GstClockTimeDiff idx_interval;
312 guint64 idx_byte_interval;
313 /* ts and offset of last entry added */
314 GstClockTime index_last_ts;
315 gint64 index_last_offset;
316 gboolean index_last_valid;
318 /* timestamps currently produced are accurate, e.g. started from 0 onwards */
319 gboolean exact_position;
320 /* seek events are temporarily kept to match them with newsegments */
321 GSList *pending_seeks;
323 /* reverse playback */
324 GSList *buffers_pending;
325 GSList *buffers_head;
326 GSList *buffers_queued;
327 GSList *buffers_send;
328 GstClockTime last_pts;
329 GstClockTime last_dts;
332 /* Pending serialized events */
333 GList *pending_events;
335 /* If baseparse has checked the caps to identify if it is
336 * handling video or audio */
337 gboolean checked_media;
339 /* offset of last parsed frame/data */
341 /* force a new frame, regardless of offset */
343 /* whether we are merely scanning for a frame */
345 /* ... and resulting frame, if any */
346 GstBaseParseFrame *scanned_frame;
348 /* TRUE if we're still detecting the format, i.e.
349 * if ::detect() is still called for future buffers */
351 GList *detect_buffers;
352 guint detect_buffers_size;
354 /* True when no buffers have been received yet */
355 gboolean first_buffer;
357 /* if TRUE, a STREAM_START event needs to be pushed */
358 gboolean push_stream_start;
360 /* When we need to skip more data than we have currently */
364 typedef struct _GstBaseParseSeek
369 GstClockTime start_ts;
372 #define DEFAULT_DISABLE_PASSTHROUGH FALSE
377 PROP_DISABLE_PASSTHROUGH,
381 #define GST_BASE_PARSE_INDEX_LOCK(parse) \
382 g_mutex_lock (&parse->priv->index_lock);
383 #define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
384 g_mutex_unlock (&parse->priv->index_lock);
386 static GstElementClass *parent_class = NULL;
388 static void gst_base_parse_class_init (GstBaseParseClass * klass);
389 static void gst_base_parse_init (GstBaseParse * parse,
390 GstBaseParseClass * klass);
393 gst_base_parse_get_type (void)
395 static volatile gsize base_parse_type = 0;
397 if (g_once_init_enter (&base_parse_type)) {
398 static const GTypeInfo base_parse_info = {
399 sizeof (GstBaseParseClass),
400 (GBaseInitFunc) NULL,
401 (GBaseFinalizeFunc) NULL,
402 (GClassInitFunc) gst_base_parse_class_init,
405 sizeof (GstBaseParse),
407 (GInstanceInitFunc) gst_base_parse_init,
411 _type = g_type_register_static (GST_TYPE_ELEMENT,
412 "GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
413 g_once_init_leave (&base_parse_type, _type);
415 return (GType) base_parse_type;
418 static void gst_base_parse_finalize (GObject * object);
420 static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
421 GstStateChange transition);
422 static void gst_base_parse_reset (GstBaseParse * parse);
425 static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
426 static GstIndex *gst_base_parse_get_index (GstElement * element);
429 static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
431 static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
432 GstObject * parent, GstPadMode mode, gboolean active);
433 static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
435 static void gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event);
437 static void gst_base_parse_set_property (GObject * object, guint prop_id,
438 const GValue * value, GParamSpec * pspec);
439 static void gst_base_parse_get_property (GObject * object, guint prop_id,
440 GValue * value, GParamSpec * pspec);
442 static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
444 static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
447 static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
449 static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
452 static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
454 static void gst_base_parse_loop (GstPad * pad);
456 static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
457 GstBaseParseFrame * frame);
459 static gboolean gst_base_parse_sink_event_default (GstBaseParse * parse,
462 static gboolean gst_base_parse_src_event_default (GstBaseParse * parse,
465 static gboolean gst_base_parse_sink_query_default (GstBaseParse * parse,
467 static gboolean gst_base_parse_src_query_default (GstBaseParse * parse,
470 static void gst_base_parse_drain (GstBaseParse * parse);
472 static void gst_base_parse_post_bitrates (GstBaseParse * parse,
473 gboolean post_min, gboolean post_avg, gboolean post_max);
475 static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
476 GstClockTime time, gboolean before, GstClockTime * _ts);
477 static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
478 GstClockTime * _time, gint64 * _offset);
480 static GstFlowReturn gst_base_parse_start_fragment (GstBaseParse * parse);
481 static GstFlowReturn gst_base_parse_finish_fragment (GstBaseParse * parse,
483 static GstFlowReturn gst_base_parse_send_buffers (GstBaseParse * parse);
485 static inline GstFlowReturn gst_base_parse_check_sync (GstBaseParse * parse);
487 static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
489 static void gst_base_parse_push_pending_events (GstBaseParse * parse);
492 gst_base_parse_clear_queues (GstBaseParse * parse)
494 g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
495 g_slist_free (parse->priv->buffers_queued);
496 parse->priv->buffers_queued = NULL;
497 g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
499 g_slist_free (parse->priv->buffers_pending);
500 parse->priv->buffers_pending = NULL;
501 g_slist_foreach (parse->priv->buffers_head, (GFunc) gst_buffer_unref, NULL);
502 g_slist_free (parse->priv->buffers_head);
503 parse->priv->buffers_head = NULL;
504 g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
505 g_slist_free (parse->priv->buffers_send);
506 parse->priv->buffers_send = NULL;
508 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
509 g_list_free (parse->priv->detect_buffers);
510 parse->priv->detect_buffers = NULL;
511 parse->priv->detect_buffers_size = 0;
513 g_queue_foreach (&parse->priv->queued_frames,
514 (GFunc) gst_base_parse_frame_free, NULL);
515 g_queue_clear (&parse->priv->queued_frames);
517 gst_buffer_replace (&parse->priv->cache, NULL);
519 g_list_foreach (parse->priv->pending_events, (GFunc) gst_event_unref, NULL);
520 g_list_free (parse->priv->pending_events);
521 parse->priv->pending_events = NULL;
523 parse->priv->checked_media = FALSE;
527 gst_base_parse_finalize (GObject * object)
529 GstBaseParse *parse = GST_BASE_PARSE (object);
531 g_object_unref (parse->priv->adapter);
533 if (parse->priv->index) {
534 gst_object_unref (parse->priv->index);
535 parse->priv->index = NULL;
537 g_mutex_clear (&parse->priv->index_lock);
539 gst_base_parse_clear_queues (parse);
541 G_OBJECT_CLASS (parent_class)->finalize (object);
545 gst_base_parse_class_init (GstBaseParseClass * klass)
547 GObjectClass *gobject_class;
548 GstElementClass *gstelement_class;
550 gobject_class = G_OBJECT_CLASS (klass);
551 g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
552 parent_class = g_type_class_peek_parent (klass);
554 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
555 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_base_parse_set_property);
556 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_base_parse_get_property);
559 * GstBaseParse:disable-passthrough:
561 * If set to %TRUE, baseparse will unconditionally force parsing of the
562 * incoming data. This can be required in the rare cases where the incoming
563 * side-data (caps, pts, dts, ...) is not trusted by the user and wants to
564 * force validation and parsing of the incoming data.
565 * If set to %FALSE, decision of whether to parse the data or not is up to
566 * the implementation (standard behaviour).
568 g_object_class_install_property (gobject_class, PROP_DISABLE_PASSTHROUGH,
569 g_param_spec_boolean ("disable-passthrough", "Disable passthrough",
570 "Force processing (disables passthrough)",
571 DEFAULT_DISABLE_PASSTHROUGH,
572 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
574 gstelement_class = (GstElementClass *) klass;
575 gstelement_class->change_state =
576 GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
579 gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
580 gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
583 /* Default handlers */
584 klass->sink_event = gst_base_parse_sink_event_default;
585 klass->src_event = gst_base_parse_src_event_default;
586 klass->sink_query = gst_base_parse_sink_query_default;
587 klass->src_query = gst_base_parse_src_query_default;
588 klass->convert = gst_base_parse_convert_default;
590 GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
591 "baseparse element");
595 gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
597 GstPadTemplate *pad_template;
599 GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
601 parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
604 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
605 g_return_if_fail (pad_template != NULL);
606 parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
607 gst_pad_set_event_function (parse->sinkpad,
608 GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
609 gst_pad_set_query_function (parse->sinkpad,
610 GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
611 gst_pad_set_chain_function (parse->sinkpad,
612 GST_DEBUG_FUNCPTR (gst_base_parse_chain));
613 gst_pad_set_activate_function (parse->sinkpad,
614 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
615 gst_pad_set_activatemode_function (parse->sinkpad,
616 GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
617 GST_PAD_SET_PROXY_ALLOCATION (parse->sinkpad);
618 gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
620 GST_DEBUG_OBJECT (parse, "sinkpad created");
623 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
624 g_return_if_fail (pad_template != NULL);
625 parse->srcpad = gst_pad_new_from_template (pad_template, "src");
626 gst_pad_set_event_function (parse->srcpad,
627 GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
628 gst_pad_set_query_function (parse->srcpad,
629 GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
630 gst_pad_use_fixed_caps (parse->srcpad);
631 gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
632 GST_DEBUG_OBJECT (parse, "src created");
634 g_queue_init (&parse->priv->queued_frames);
636 parse->priv->adapter = gst_adapter_new ();
638 parse->priv->pad_mode = GST_PAD_MODE_NONE;
640 g_mutex_init (&parse->priv->index_lock);
643 gst_base_parse_reset (parse);
644 GST_DEBUG_OBJECT (parse, "init ok");
646 GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE);
650 gst_base_parse_set_property (GObject * object, guint prop_id,
651 const GValue * value, GParamSpec * pspec)
653 GstBaseParse *parse = GST_BASE_PARSE (object);
656 case PROP_DISABLE_PASSTHROUGH:
657 parse->priv->disable_passthrough = g_value_get_boolean (value);
660 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
666 gst_base_parse_get_property (GObject * object, guint prop_id, GValue * value,
669 GstBaseParse *parse = GST_BASE_PARSE (object);
672 case PROP_DISABLE_PASSTHROUGH:
673 g_value_set_boolean (value, parse->priv->disable_passthrough);
676 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
681 static GstBaseParseFrame *
682 gst_base_parse_frame_copy (GstBaseParseFrame * frame)
684 GstBaseParseFrame *copy;
686 copy = g_slice_dup (GstBaseParseFrame, frame);
687 copy->buffer = gst_buffer_ref (frame->buffer);
688 copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
690 GST_TRACE ("copied frame %p -> %p", frame, copy);
696 gst_base_parse_frame_free (GstBaseParseFrame * frame)
698 GST_TRACE ("freeing frame %p", frame);
701 gst_buffer_unref (frame->buffer);
702 frame->buffer = NULL;
705 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
706 g_slice_free (GstBaseParseFrame, frame);
708 memset (frame, 0, sizeof (*frame));
712 G_DEFINE_BOXED_TYPE (GstBaseParseFrame, gst_base_parse_frame,
713 (GBoxedCopyFunc) gst_base_parse_frame_copy,
714 (GBoxedFreeFunc) gst_base_parse_frame_free);
717 * gst_base_parse_frame_init:
718 * @frame: #GstBaseParseFrame.
720 * Sets a #GstBaseParseFrame to initial state. Currently this means
721 * all public fields are zero-ed and a private flag is set to make
722 * sure gst_base_parse_frame_free() only frees the contents but not
723 * the actual frame. Use this function to initialise a #GstBaseParseFrame
724 * allocated on the stack.
727 gst_base_parse_frame_init (GstBaseParseFrame * frame)
729 memset (frame, 0, sizeof (GstBaseParseFrame));
730 frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
731 GST_TRACE ("inited frame %p", frame);
735 * gst_base_parse_frame_new:
736 * @buffer: (transfer none): a #GstBuffer
738 * @overhead: number of bytes in this frame which should be counted as
739 * metadata overhead, ie. not used to calculate the average bitrate.
740 * Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
742 * Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
743 * elements written in C should usually allocate the frame on the stack and
744 * then use gst_base_parse_frame_init() to initialise it.
746 * Returns: a newly-allocated #GstBaseParseFrame. Free with
747 * gst_base_parse_frame_free() when no longer needed.
750 gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
753 GstBaseParseFrame *frame;
755 frame = g_slice_new0 (GstBaseParseFrame);
756 frame->buffer = gst_buffer_ref (buffer);
758 GST_TRACE ("created frame %p", frame);
763 gst_base_parse_update_flags (GstBaseParse * parse)
767 /* set flags one by one for clarity */
768 if (G_UNLIKELY (parse->priv->drain))
769 parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
771 /* losing sync is pretty much a discont (and vice versa), no ? */
772 if (G_UNLIKELY (parse->priv->discont))
773 parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
777 gst_base_parse_update_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
779 if (G_UNLIKELY (parse->priv->discont)) {
780 GST_DEBUG_OBJECT (parse, "marking DISCONT");
781 GST_BUFFER_FLAG_SET (frame->buffer, GST_BUFFER_FLAG_DISCONT);
784 if (parse->priv->prev_offset != parse->priv->offset || parse->priv->new_frame) {
785 GST_LOG_OBJECT (parse, "marking as new frame");
786 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME;
789 frame->offset = parse->priv->prev_offset = parse->priv->offset;
793 gst_base_parse_reset (GstBaseParse * parse)
795 GST_OBJECT_LOCK (parse);
796 gst_segment_init (&parse->segment, GST_FORMAT_TIME);
797 parse->priv->duration = -1;
798 parse->priv->min_frame_size = 1;
799 parse->priv->discont = TRUE;
800 parse->priv->flushing = FALSE;
801 parse->priv->saw_gaps = FALSE;
802 parse->priv->offset = 0;
803 parse->priv->sync_offset = 0;
804 parse->priv->update_interval = -1;
805 parse->priv->fps_num = parse->priv->fps_den = 0;
806 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
807 parse->priv->lead_in = parse->priv->lead_out = 0;
808 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
809 parse->priv->bitrate = 0;
810 parse->priv->framecount = 0;
811 parse->priv->bytecount = 0;
812 parse->priv->acc_duration = 0;
813 parse->priv->first_frame_pts = GST_CLOCK_TIME_NONE;
814 parse->priv->first_frame_dts = GST_CLOCK_TIME_NONE;
815 parse->priv->first_frame_offset = -1;
816 parse->priv->estimated_duration = -1;
817 parse->priv->estimated_drift = 0;
818 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
819 parse->priv->next_dts = 0;
820 parse->priv->syncable = TRUE;
821 parse->priv->disable_passthrough = DEFAULT_DISABLE_PASSTHROUGH;
822 parse->priv->passthrough = FALSE;
823 parse->priv->pts_interpolate = TRUE;
824 parse->priv->infer_ts = TRUE;
825 parse->priv->has_timing_info = FALSE;
826 parse->priv->post_min_bitrate = TRUE;
827 parse->priv->post_avg_bitrate = TRUE;
828 parse->priv->post_max_bitrate = TRUE;
829 parse->priv->min_bitrate = G_MAXUINT;
830 parse->priv->max_bitrate = 0;
831 parse->priv->avg_bitrate = 0;
832 parse->priv->posted_avg_bitrate = 0;
834 parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
835 parse->priv->index_last_offset = -1;
836 parse->priv->index_last_valid = TRUE;
837 parse->priv->upstream_seekable = FALSE;
838 parse->priv->upstream_size = 0;
839 parse->priv->upstream_has_duration = FALSE;
840 parse->priv->upstream_format = GST_FORMAT_UNDEFINED;
841 parse->priv->idx_interval = 0;
842 parse->priv->idx_byte_interval = 0;
843 parse->priv->exact_position = TRUE;
844 parse->priv->seen_keyframe = FALSE;
845 parse->priv->checked_media = FALSE;
847 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
848 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
849 parse->priv->last_offset = 0;
851 parse->priv->skip = 0;
853 g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
855 g_list_free (parse->priv->pending_events);
856 parse->priv->pending_events = NULL;
858 if (parse->priv->cache) {
859 gst_buffer_unref (parse->priv->cache);
860 parse->priv->cache = NULL;
863 g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
864 g_slist_free (parse->priv->pending_seeks);
865 parse->priv->pending_seeks = NULL;
867 if (parse->priv->adapter)
868 gst_adapter_clear (parse->priv->adapter);
870 parse->priv->new_frame = TRUE;
872 parse->priv->first_buffer = TRUE;
874 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
875 g_list_free (parse->priv->detect_buffers);
876 parse->priv->detect_buffers = NULL;
877 parse->priv->detect_buffers_size = 0;
878 GST_OBJECT_UNLOCK (parse);
881 /* gst_base_parse_parse_frame:
882 * @parse: #GstBaseParse.
883 * @buffer: #GstBuffer.
885 * Default callback for parse_frame.
888 gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
890 GstBuffer *buffer = frame->buffer;
892 if (!GST_BUFFER_PTS_IS_VALID (buffer) &&
893 GST_CLOCK_TIME_IS_VALID (parse->priv->next_pts)) {
894 GST_BUFFER_PTS (buffer) = parse->priv->next_pts;
896 if (!GST_BUFFER_DTS_IS_VALID (buffer) &&
897 GST_CLOCK_TIME_IS_VALID (parse->priv->next_dts)) {
898 GST_BUFFER_DTS (buffer) = parse->priv->next_dts;
900 if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
901 GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
902 GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
907 /* gst_base_parse_convert:
908 * @parse: #GstBaseParse.
909 * @src_format: #GstFormat describing the source format.
910 * @src_value: Source value to be converted.
911 * @dest_format: #GstFormat defining the converted format.
912 * @dest_value: Pointer where the conversion result will be put.
914 * Converts using configured "convert" vmethod in #GstBaseParse class.
916 * Returns: %TRUE if conversion was successful.
919 gst_base_parse_convert (GstBaseParse * parse,
920 GstFormat src_format,
921 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
923 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
926 g_return_val_if_fail (dest_value != NULL, FALSE);
931 ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
933 #ifndef GST_DISABLE_GST_DEBUG
936 if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
937 GST_LOG_OBJECT (parse,
938 "TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
939 GST_TIME_ARGS (src_value), *dest_value);
940 } else if (dest_format == GST_FORMAT_TIME &&
941 src_format == GST_FORMAT_BYTES) {
942 GST_LOG_OBJECT (parse,
943 "BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
944 src_value, GST_TIME_ARGS (*dest_value));
946 GST_LOG_OBJECT (parse,
947 "%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
948 GST_STR_NULL (gst_format_get_name (src_format)),
949 GST_STR_NULL (gst_format_get_name (dest_format)),
950 src_value, *dest_value);
953 GST_DEBUG_OBJECT (parse, "conversion failed");
961 /* gst_base_parse_sink_event:
962 * @pad: #GstPad that received the event.
963 * @event: #GstEvent to be handled.
965 * Handler for sink pad events.
967 * Returns: %TRUE if the event was handled.
970 gst_base_parse_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
972 GstBaseParse *parse = GST_BASE_PARSE (parent);
973 GstBaseParseClass *bclass = GST_BASE_PARSE_GET_CLASS (parse);
976 ret = bclass->sink_event (parse, event);
982 /* gst_base_parse_sink_event_default:
983 * @parse: #GstBaseParse.
984 * @event: #GstEvent to be handled.
986 * Element-level event handler function.
988 * The event will be unreffed only if it has been handled and this
989 * function returns %TRUE
991 * Returns: %TRUE if the event was handled and not need forwarding.
994 gst_base_parse_sink_event_default (GstBaseParse * parse, GstEvent * event)
996 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
997 gboolean ret = FALSE;
998 gboolean forward_immediate = FALSE;
1000 GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
1001 GST_EVENT_TYPE_NAME (event));
1003 switch (GST_EVENT_TYPE (event)) {
1004 case GST_EVENT_CAPS:
1008 gst_event_parse_caps (event, &caps);
1009 GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
1011 if (klass->set_sink_caps)
1012 ret = klass->set_sink_caps (parse, caps);
1016 /* will send our own caps downstream */
1017 gst_event_unref (event);
1021 case GST_EVENT_SEGMENT:
1023 const GstSegment *in_segment;
1024 GstSegment out_segment;
1025 gint64 offset = 0, next_dts;
1026 guint32 seqnum = gst_event_get_seqnum (event);
1028 gst_event_parse_segment (event, &in_segment);
1029 gst_segment_init (&out_segment, GST_FORMAT_TIME);
1030 out_segment.rate = in_segment->rate;
1031 out_segment.applied_rate = in_segment->applied_rate;
1033 GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
1035 parse->priv->upstream_format = in_segment->format;
1036 if (in_segment->format == GST_FORMAT_BYTES) {
1037 GstBaseParseSeek *seek = NULL;
1040 /* stop time is allowed to be open-ended, but not start & pos */
1041 offset = in_segment->time;
1043 GST_OBJECT_LOCK (parse);
1044 for (node = parse->priv->pending_seeks; node; node = node->next) {
1045 GstBaseParseSeek *tmp = node->data;
1047 if (tmp->offset == offset) {
1052 parse->priv->pending_seeks =
1053 g_slist_remove (parse->priv->pending_seeks, seek);
1054 GST_OBJECT_UNLOCK (parse);
1057 GST_DEBUG_OBJECT (parse,
1058 "Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
1059 seek->accurate ? " accurate" : "", &seek->segment);
1061 out_segment.start = seek->segment.start;
1062 out_segment.stop = seek->segment.stop;
1063 out_segment.time = seek->segment.start;
1065 next_dts = seek->start_ts;
1066 parse->priv->exact_position = seek->accurate;
1069 /* best attempt convert */
1070 /* as these are only estimates, stop is kept open-ended to avoid
1071 * premature cutting */
1072 gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
1073 GST_FORMAT_TIME, (gint64 *) & next_dts);
1075 out_segment.start = next_dts;
1076 out_segment.stop = GST_CLOCK_TIME_NONE;
1077 out_segment.time = next_dts;
1079 parse->priv->exact_position = (in_segment->start == 0);
1082 gst_event_unref (event);
1084 event = gst_event_new_segment (&out_segment);
1085 gst_event_set_seqnum (event, seqnum);
1087 GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
1088 GST_SEGMENT_FORMAT, in_segment);
1090 } else if (in_segment->format != GST_FORMAT_TIME) {
1091 /* Unknown incoming segment format. Output a default open-ended
1093 gst_event_unref (event);
1095 out_segment.start = 0;
1096 out_segment.stop = GST_CLOCK_TIME_NONE;
1097 out_segment.time = 0;
1099 event = gst_event_new_segment (&out_segment);
1100 gst_event_set_seqnum (event, seqnum);
1104 /* not considered BYTE seekable if it is talking to us in TIME,
1105 * whatever else it might claim */
1106 parse->priv->upstream_seekable = FALSE;
1107 next_dts = in_segment->start;
1108 gst_event_copy_segment (event, &out_segment);
1111 memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
1114 gst_segment_set_newsegment (&parse->segment, update, rate,
1115 applied_rate, format, start, stop, start);
1120 /* save the segment for later, right before we push a new buffer so that
1121 * the caps are fixed and the next linked element can receive
1122 * the segment but finish the current segment */
1123 GST_DEBUG_OBJECT (parse, "draining current segment");
1124 if (in_segment->rate > 0.0)
1125 gst_base_parse_drain (parse);
1127 gst_base_parse_finish_fragment (parse, FALSE);
1128 gst_adapter_clear (parse->priv->adapter);
1130 parse->priv->offset = offset;
1131 parse->priv->sync_offset = offset;
1132 parse->priv->next_dts = next_dts;
1133 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
1134 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
1135 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
1136 parse->priv->prev_pts = GST_CLOCK_TIME_NONE;
1137 parse->priv->prev_dts = GST_CLOCK_TIME_NONE;
1138 parse->priv->discont = TRUE;
1139 parse->priv->seen_keyframe = FALSE;
1140 parse->priv->skip = 0;
1144 case GST_EVENT_SEGMENT_DONE:
1145 /* need to drain now, rather than upon a new segment,
1146 * since that would have SEGMENT_DONE come before potential
1147 * delayed last part of the current segment */
1148 GST_DEBUG_OBJECT (parse, "draining current segment");
1149 if (parse->segment.rate > 0.0)
1150 gst_base_parse_drain (parse);
1152 gst_base_parse_finish_fragment (parse, FALSE);
1153 /* Also forward event immediately, there might be no new data
1154 * coming afterwards that would allow us to forward it later */
1155 forward_immediate = TRUE;
1158 case GST_EVENT_FLUSH_START:
1159 GST_OBJECT_LOCK (parse);
1160 parse->priv->flushing = TRUE;
1161 GST_OBJECT_UNLOCK (parse);
1164 case GST_EVENT_FLUSH_STOP:
1165 gst_adapter_clear (parse->priv->adapter);
1166 gst_base_parse_clear_queues (parse);
1167 parse->priv->flushing = FALSE;
1168 parse->priv->discont = TRUE;
1169 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
1170 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
1171 parse->priv->new_frame = TRUE;
1172 parse->priv->skip = 0;
1174 forward_immediate = TRUE;
1178 if (parse->segment.rate > 0.0)
1179 gst_base_parse_drain (parse);
1181 gst_base_parse_finish_fragment (parse, TRUE);
1183 /* If we STILL have zero frames processed, fire an error */
1184 if (parse->priv->framecount == 0 && !parse->priv->saw_gaps &&
1185 !parse->priv->first_buffer) {
1186 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
1187 ("No valid frames found before end of stream"), (NULL));
1189 /* newsegment and other serialized events before eos */
1190 gst_base_parse_push_pending_events (parse);
1192 if (!parse->priv->saw_gaps
1193 && parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1194 /* We've not posted bitrate tags yet - do so now */
1195 gst_base_parse_post_bitrates (parse, TRUE, TRUE, TRUE);
1197 forward_immediate = TRUE;
1199 case GST_EVENT_CUSTOM_DOWNSTREAM:{
1200 /* FIXME: Code duplicated from libgstvideo because core can't depend on -base */
1201 #ifndef GST_VIDEO_EVENT_STILL_STATE_NAME
1202 #define GST_VIDEO_EVENT_STILL_STATE_NAME "GstEventStillFrame"
1205 const GstStructure *s;
1206 gboolean ev_still_state;
1208 s = gst_event_get_structure (event);
1210 gst_structure_has_name (s, GST_VIDEO_EVENT_STILL_STATE_NAME) &&
1211 gst_structure_get_boolean (s, "still-state", &ev_still_state)) {
1212 if (ev_still_state) {
1213 GST_DEBUG_OBJECT (parse, "draining current data for still-frame");
1214 if (parse->segment.rate > 0.0)
1215 gst_base_parse_drain (parse);
1217 gst_base_parse_finish_fragment (parse, TRUE);
1219 forward_immediate = TRUE;
1225 GST_DEBUG_OBJECT (parse, "draining current data due to gap event");
1227 gst_base_parse_push_pending_events (parse);
1229 if (parse->segment.rate > 0.0)
1230 gst_base_parse_drain (parse);
1232 gst_base_parse_finish_fragment (parse, TRUE);
1233 forward_immediate = TRUE;
1234 parse->priv->saw_gaps = TRUE;
1238 /* See if any bitrate tags were posted */
1239 gst_base_parse_handle_tag (parse, event);
1242 case GST_EVENT_STREAM_START:
1243 if (parse->priv->pad_mode != GST_PAD_MODE_PULL)
1244 forward_immediate = TRUE;
1251 /* Forward non-serialized events and EOS/FLUSH_STOP immediately.
1252 * For EOS this is required because no buffer or serialized event
1253 * will come after EOS and nothing could trigger another
1254 * _finish_frame() call. *
1255 * If the subclass handles sending of EOS manually it can return
1256 * _DROPPED from ::finish() and all other subclasses should have
1257 * decoded/flushed all remaining data before this
1259 * For FLUSH_STOP this is required because it is expected
1260 * to be forwarded immediately and no buffers are queued anyway.
1263 if (!GST_EVENT_IS_SERIALIZED (event) || forward_immediate) {
1264 ret = gst_pad_push_event (parse->srcpad, event);
1266 parse->priv->pending_events =
1267 g_list_prepend (parse->priv->pending_events, event);
1272 GST_DEBUG_OBJECT (parse, "event handled");
1278 gst_base_parse_sink_query_default (GstBaseParse * parse, GstQuery * query)
1283 pad = GST_BASE_PARSE_SINK_PAD (parse);
1285 switch (GST_QUERY_TYPE (query)) {
1286 case GST_QUERY_CAPS:
1288 GstBaseParseClass *bclass;
1290 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1292 if (bclass->get_sink_caps) {
1293 GstCaps *caps, *filter;
1295 gst_query_parse_caps (query, &filter);
1296 caps = bclass->get_sink_caps (parse, filter);
1297 GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
1299 gst_query_set_caps_result (query, caps);
1300 gst_caps_unref (caps);
1304 GstCaps *caps, *template_caps, *filter;
1306 gst_query_parse_caps (query, &filter);
1307 template_caps = gst_pad_get_pad_template_caps (pad);
1308 if (filter != NULL) {
1310 gst_caps_intersect_full (filter, template_caps,
1311 GST_CAPS_INTERSECT_FIRST);
1312 gst_caps_unref (template_caps);
1314 caps = template_caps;
1316 gst_query_set_caps_result (query, caps);
1317 gst_caps_unref (caps);
1325 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
1334 gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1336 GstBaseParseClass *bclass;
1337 GstBaseParse *parse;
1340 parse = GST_BASE_PARSE (parent);
1341 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1343 GST_DEBUG_OBJECT (parse, "%s query", GST_QUERY_TYPE_NAME (query));
1345 if (bclass->sink_query)
1346 ret = bclass->sink_query (parse, query);
1350 GST_LOG_OBJECT (parse, "%s query result: %d %" GST_PTR_FORMAT,
1351 GST_QUERY_TYPE_NAME (query), ret, query);
1357 gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
1359 GstBaseParseClass *bclass;
1360 GstBaseParse *parse;
1363 parse = GST_BASE_PARSE (parent);
1364 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1366 GST_DEBUG_OBJECT (parse, "%s query: %" GST_PTR_FORMAT,
1367 GST_QUERY_TYPE_NAME (query), query);
1369 if (bclass->src_query)
1370 ret = bclass->src_query (parse, query);
1374 GST_LOG_OBJECT (parse, "%s query result: %d %" GST_PTR_FORMAT,
1375 GST_QUERY_TYPE_NAME (query), ret, query);
1380 /* gst_base_parse_src_event:
1381 * @pad: #GstPad that received the event.
1382 * @event: #GstEvent that was received.
1384 * Handler for source pad events.
1386 * Returns: %TRUE if the event was handled.
1389 gst_base_parse_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1391 GstBaseParse *parse;
1392 GstBaseParseClass *bclass;
1393 gboolean ret = TRUE;
1395 parse = GST_BASE_PARSE (parent);
1396 bclass = GST_BASE_PARSE_GET_CLASS (parse);
1398 GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
1399 GST_EVENT_TYPE_NAME (event));
1401 if (bclass->src_event)
1402 ret = bclass->src_event (parse, event);
1404 gst_event_unref (event);
1410 gst_base_parse_is_seekable (GstBaseParse * parse)
1412 /* FIXME: could do more here, e.g. check index or just send data from 0
1413 * in pull mode and let decoder/sink clip */
1414 return parse->priv->syncable;
1417 /* gst_base_parse_src_event_default:
1418 * @parse: #GstBaseParse.
1419 * @event: #GstEvent that was received.
1421 * Default srcpad event handler.
1423 * Returns: %TRUE if the event was handled and can be dropped.
1426 gst_base_parse_src_event_default (GstBaseParse * parse, GstEvent * event)
1428 gboolean res = FALSE;
1430 switch (GST_EVENT_TYPE (event)) {
1431 case GST_EVENT_SEEK:
1432 if (gst_base_parse_is_seekable (parse))
1433 res = gst_base_parse_handle_seek (parse, event);
1436 res = gst_pad_event_default (parse->srcpad, GST_OBJECT_CAST (parse),
1445 * gst_base_parse_convert_default:
1446 * @parse: #GstBaseParse.
1447 * @src_format: #GstFormat describing the source format.
1448 * @src_value: Source value to be converted.
1449 * @dest_format: #GstFormat defining the converted format.
1450 * @dest_value: Pointer where the conversion result will be put.
1452 * Default implementation of "convert" vmethod in #GstBaseParse class.
1454 * Returns: %TRUE if conversion was successful.
1457 gst_base_parse_convert_default (GstBaseParse * parse,
1458 GstFormat src_format,
1459 gint64 src_value, GstFormat dest_format, gint64 * dest_value)
1461 gboolean ret = FALSE;
1462 guint64 bytes, duration;
1464 if (G_UNLIKELY (src_format == dest_format)) {
1465 *dest_value = src_value;
1469 if (G_UNLIKELY (src_value == -1)) {
1474 if (G_UNLIKELY (src_value == 0)) {
1479 /* need at least some frames */
1480 if (!parse->priv->framecount)
1483 duration = parse->priv->acc_duration / GST_MSECOND;
1484 bytes = parse->priv->bytecount;
1486 if (G_UNLIKELY (!duration || !bytes))
1487 goto no_duration_bytes;
1489 if (src_format == GST_FORMAT_BYTES) {
1490 if (dest_format == GST_FORMAT_TIME) {
1491 /* BYTES -> TIME conversion */
1492 GST_DEBUG_OBJECT (parse, "converting bytes -> time");
1493 *dest_value = gst_util_uint64_scale (src_value, duration, bytes);
1494 *dest_value *= GST_MSECOND;
1495 GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
1496 *dest_value / GST_MSECOND);
1499 GST_DEBUG_OBJECT (parse, "converting bytes -> other not implemented");
1501 } else if (src_format == GST_FORMAT_TIME) {
1502 if (dest_format == GST_FORMAT_BYTES) {
1503 GST_DEBUG_OBJECT (parse, "converting time -> bytes");
1504 *dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
1506 GST_DEBUG_OBJECT (parse,
1507 "time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
1508 src_value / GST_MSECOND, *dest_value);
1511 GST_DEBUG_OBJECT (parse, "converting time -> other not implemented");
1513 } else if (src_format == GST_FORMAT_DEFAULT) {
1514 /* DEFAULT == frame-based */
1515 if (dest_format == GST_FORMAT_TIME) {
1516 GST_DEBUG_OBJECT (parse, "converting default -> time");
1517 if (parse->priv->fps_den) {
1518 *dest_value = gst_util_uint64_scale (src_value,
1519 GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
1523 GST_DEBUG_OBJECT (parse, "converting default -> other not implemented");
1526 GST_DEBUG_OBJECT (parse, "conversion not implemented");
1533 GST_DEBUG_OBJECT (parse, "no framecount");
1538 GST_DEBUG_OBJECT (parse, "no duration %" G_GUINT64_FORMAT ", bytes %"
1539 G_GUINT64_FORMAT, duration, bytes);
1546 gst_base_parse_update_duration (GstBaseParse * baseparse)
1549 GstBaseParse *parse;
1551 parse = GST_BASE_PARSE (baseparse);
1553 peer = gst_pad_get_peer (parse->sinkpad);
1555 gboolean qres = FALSE;
1556 gint64 ptot, dest_value;
1558 qres = gst_pad_query_duration (peer, GST_FORMAT_BYTES, &ptot);
1559 gst_object_unref (GST_OBJECT (peer));
1561 if (gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
1562 GST_FORMAT_TIME, &dest_value)) {
1564 /* inform if duration changed, but try to avoid spamming */
1565 parse->priv->estimated_drift +=
1566 dest_value - parse->priv->estimated_duration;
1568 parse->priv->estimated_duration = dest_value;
1569 GST_LOG_OBJECT (parse,
1570 "updated estimated duration to %" GST_TIME_FORMAT,
1571 GST_TIME_ARGS (dest_value));
1573 if (parse->priv->estimated_drift > GST_SECOND ||
1574 parse->priv->estimated_drift < -GST_SECOND) {
1575 gst_element_post_message (GST_ELEMENT (parse),
1576 gst_message_new_duration_changed (GST_OBJECT (parse)));
1577 parse->priv->estimated_drift = 0;
1585 gst_base_parse_post_bitrates (GstBaseParse * parse, gboolean post_min,
1586 gboolean post_avg, gboolean post_max)
1588 GstTagList *taglist = NULL;
1590 if (post_min && parse->priv->post_min_bitrate) {
1591 taglist = gst_tag_list_new_empty ();
1593 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1594 GST_TAG_MINIMUM_BITRATE, parse->priv->min_bitrate, NULL);
1597 if (post_avg && parse->priv->post_avg_bitrate) {
1598 if (taglist == NULL)
1599 taglist = gst_tag_list_new_empty ();
1601 parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
1602 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE, GST_TAG_BITRATE,
1603 parse->priv->avg_bitrate, NULL);
1606 if (post_max && parse->priv->post_max_bitrate) {
1607 if (taglist == NULL)
1608 taglist = gst_tag_list_new_empty ();
1610 gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
1611 GST_TAG_MAXIMUM_BITRATE, parse->priv->max_bitrate, NULL);
1614 GST_DEBUG_OBJECT (parse, "Updated bitrates. Min: %u, Avg: %u, Max: %u",
1615 parse->priv->min_bitrate, parse->priv->avg_bitrate,
1616 parse->priv->max_bitrate);
1618 if (taglist != NULL) {
1619 gst_pad_push_event (parse->srcpad, gst_event_new_tag (taglist));
1623 /* gst_base_parse_update_bitrates:
1624 * @parse: #GstBaseParse.
1625 * @buffer: Current frame as a #GstBuffer
1627 * Keeps track of the minimum and maximum bitrates, and also maintains a
1628 * running average bitrate of the stream so far.
1631 gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
1633 /* Only update the tag on a 10 kbps delta */
1634 static const gint update_threshold = 10000;
1636 guint64 data_len, frame_dur;
1637 gint overhead, frame_bitrate, old_avg_bitrate;
1638 gboolean update_min = FALSE, update_avg = FALSE, update_max = FALSE;
1639 GstBuffer *buffer = frame->buffer;
1641 overhead = frame->overhead;
1645 data_len = gst_buffer_get_size (buffer) - overhead;
1646 parse->priv->data_bytecount += data_len;
1648 /* duration should be valid by now,
1649 * either set by subclass or maybe based on fps settings */
1650 if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
1651 /* Calculate duration of a frame from buffer properties */
1652 frame_dur = GST_BUFFER_DURATION (buffer);
1653 parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
1654 parse->priv->acc_duration;
1657 /* No way to figure out frame duration (is this even possible?) */
1661 /* override if subclass provided bitrate, e.g. metadata based */
1662 if (parse->priv->bitrate) {
1663 parse->priv->avg_bitrate = parse->priv->bitrate;
1664 /* spread this (confirmed) info ASAP */
1665 if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
1666 gst_base_parse_post_bitrates (parse, FALSE, TRUE, FALSE);
1670 frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
1674 GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
1675 parse->priv->avg_bitrate);
1677 if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
1679 } else if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE) {
1680 /* always post all at threshold time */
1681 update_min = update_max = update_avg = TRUE;
1684 if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
1685 if (frame_bitrate < parse->priv->min_bitrate) {
1686 parse->priv->min_bitrate = frame_bitrate;
1690 if (frame_bitrate > parse->priv->max_bitrate) {
1691 parse->priv->max_bitrate = frame_bitrate;
1695 old_avg_bitrate = parse->priv->posted_avg_bitrate;
1696 if ((gint) (old_avg_bitrate - parse->priv->avg_bitrate) > update_threshold
1697 || (gint) (parse->priv->avg_bitrate - old_avg_bitrate) >
1702 if ((update_min || update_avg || update_max))
1703 gst_base_parse_post_bitrates (parse, update_min, update_avg, update_max);
1710 * gst_base_parse_add_index_entry:
1711 * @parse: #GstBaseParse.
1712 * @offset: offset of entry
1713 * @ts: timestamp associated with offset
1714 * @key: whether entry refers to keyframe
1715 * @force: add entry disregarding sanity checks
1717 * Adds an entry to the index associating @offset to @ts. It is recommended
1718 * to only add keyframe entries. @force allows to bypass checks, such as
1719 * whether the stream is (upstream) seekable, another entry is already "close"
1720 * to the new entry, etc.
1722 * Returns: #gboolean indicating whether entry was added
1725 gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
1726 GstClockTime ts, gboolean key, gboolean force)
1728 gboolean ret = FALSE;
1729 GstIndexAssociation associations[2];
1731 GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
1732 " @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
1734 if (G_LIKELY (!force)) {
1736 if (!parse->priv->upstream_seekable) {
1737 GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
1741 /* FIXME need better helper data structure that handles these issues
1742 * related to ongoing collecting of index entries */
1743 if (parse->priv->index_last_offset + parse->priv->idx_byte_interval >=
1745 GST_LOG_OBJECT (parse,
1746 "already have entries up to offset 0x%08" G_GINT64_MODIFIER "x",
1747 parse->priv->index_last_offset + parse->priv->idx_byte_interval);
1751 if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
1752 GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
1753 parse->priv->idx_interval) {
1754 GST_LOG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
1755 GST_TIME_ARGS (parse->priv->index_last_ts));
1759 /* if last is not really the last one */
1760 if (!parse->priv->index_last_valid) {
1761 GstClockTime prev_ts;
1763 gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
1764 if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
1765 GST_LOG_OBJECT (parse,
1766 "entry too close to existing entry %" GST_TIME_FORMAT,
1767 GST_TIME_ARGS (prev_ts));
1768 parse->priv->index_last_offset = offset;
1769 parse->priv->index_last_ts = ts;
1775 associations[0].format = GST_FORMAT_TIME;
1776 associations[0].value = ts;
1777 associations[1].format = GST_FORMAT_BYTES;
1778 associations[1].value = offset;
1780 /* index might change on-the-fly, although that would be nutty app ... */
1781 GST_BASE_PARSE_INDEX_LOCK (parse);
1782 gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
1783 (key) ? GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT :
1784 GST_INDEX_ASSOCIATION_FLAG_DELTA_UNIT, 2,
1785 (const GstIndexAssociation *) &associations);
1786 GST_BASE_PARSE_INDEX_UNLOCK (parse);
1789 parse->priv->index_last_offset = offset;
1790 parse->priv->index_last_ts = ts;
1799 /* check for seekable upstream, above and beyond a mere query */
1801 gst_base_parse_check_seekability (GstBaseParse * parse)
1804 gboolean seekable = FALSE;
1805 gint64 start = -1, stop = -1;
1806 guint idx_interval = 0;
1807 guint64 idx_byte_interval = 0;
1809 query = gst_query_new_seeking (GST_FORMAT_BYTES);
1810 if (!gst_pad_peer_query (parse->sinkpad, query)) {
1811 GST_DEBUG_OBJECT (parse, "seeking query failed");
1815 gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
1817 /* try harder to query upstream size if we didn't get it the first time */
1818 if (seekable && stop == -1) {
1819 GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
1820 gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
1823 /* if upstream doesn't know the size, it's likely that it's not seekable in
1824 * practice even if it technically may be seekable */
1825 if (seekable && (start != 0 || stop <= start)) {
1826 GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
1830 /* let's not put every single frame into our index */
1832 if (stop < 10 * 1024 * 1024)
1834 else if (stop < 100 * 1024 * 1024)
1837 idx_interval = 1000;
1839 /* ensure that even for large files (e.g. very long audio files), the index
1840 * stays reasonably-size, with some arbitrary limit to the total number of
1842 idx_byte_interval = (stop - start) / MAX_INDEX_ENTRIES;
1843 GST_DEBUG_OBJECT (parse,
1844 "Limiting index entries to %d, indexing byte interval %"
1845 G_GUINT64_FORMAT " bytes", MAX_INDEX_ENTRIES, idx_byte_interval);
1849 gst_query_unref (query);
1851 GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
1852 G_GUINT64_FORMAT ")", seekable, start, stop);
1853 parse->priv->upstream_seekable = seekable;
1854 parse->priv->upstream_size = seekable ? stop : 0;
1856 GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
1857 parse->priv->idx_interval = idx_interval * GST_MSECOND;
1858 parse->priv->idx_byte_interval = idx_byte_interval;
1861 /* some misc checks on upstream */
1863 gst_base_parse_check_upstream (GstBaseParse * parse)
1867 if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
1868 if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
1869 /* upstream has one, accept it also, and no further updates */
1870 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
1871 parse->priv->upstream_has_duration = TRUE;
1874 GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
1875 parse->priv->upstream_has_duration);
1878 /* checks src caps to determine if dealing with audio or video */
1879 /* TODO maybe forego automagic stuff and let subclass configure it ? */
1881 gst_base_parse_check_media (GstBaseParse * parse)
1886 caps = gst_pad_get_current_caps (parse->srcpad);
1887 if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
1888 parse->priv->is_video =
1889 g_str_has_prefix (gst_structure_get_name (s), "video");
1891 /* historical default */
1892 parse->priv->is_video = FALSE;
1895 gst_caps_unref (caps);
1897 parse->priv->checked_media = TRUE;
1898 GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
1901 /* takes ownership of frame */
1903 gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
1905 if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
1906 /* frame allocated on the heap, we can just take ownership */
1907 g_queue_push_tail (&parse->priv->queued_frames, frame);
1908 GST_TRACE ("queued frame %p", frame);
1910 GstBaseParseFrame *copy;
1912 /* probably allocated on the stack, must make a proper copy */
1913 copy = gst_base_parse_frame_copy (frame);
1914 g_queue_push_tail (&parse->priv->queued_frames, copy);
1915 GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
1916 gst_base_parse_frame_free (frame);
1920 /* makes sure that @buf is properly prepared and decorated for passing
1921 * to baseclass, and an equally setup frame is returned setup with @buf.
1922 * Takes ownership of @buf. */
1923 static GstBaseParseFrame *
1924 gst_base_parse_prepare_frame (GstBaseParse * parse, GstBuffer * buffer)
1926 GstBaseParseFrame *frame = NULL;
1928 buffer = gst_buffer_make_writable (buffer);
1930 GST_LOG_OBJECT (parse,
1931 "preparing frame at offset %" G_GUINT64_FORMAT
1932 " (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
1933 GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
1934 gst_buffer_get_size (buffer));
1936 GST_BUFFER_OFFSET (buffer) = parse->priv->offset;
1938 gst_base_parse_update_flags (parse);
1940 frame = gst_base_parse_frame_new (buffer, 0, 0);
1941 gst_buffer_unref (buffer);
1942 gst_base_parse_update_frame (parse, frame);
1944 /* clear flags for next frame */
1945 parse->priv->discont = FALSE;
1946 parse->priv->new_frame = FALSE;
1948 /* use default handler to provide initial (upstream) metadata */
1949 gst_base_parse_parse_frame (parse, frame);
1954 /* Wraps buffer in a frame and dispatches to subclass.
1955 * Also manages data skipping and offset handling (including adapter flushing).
1956 * Takes ownership of @buffer */
1957 static GstFlowReturn
1958 gst_base_parse_handle_buffer (GstBaseParse * parse, GstBuffer * buffer,
1959 gint * skip, gint * flushed)
1961 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
1962 GstBaseParseFrame *frame;
1965 g_return_val_if_fail (skip != NULL || flushed != NULL, GST_FLOW_ERROR);
1967 GST_LOG_OBJECT (parse,
1968 "handling buffer of size %" G_GSIZE_FORMAT " with dts %" GST_TIME_FORMAT
1969 ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
1970 gst_buffer_get_size (buffer), GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
1971 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
1972 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
1974 /* track what is being flushed during this single round of frame processing */
1975 parse->priv->flushed = 0;
1978 /* make it easy for _finish_frame to pick up input data */
1979 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
1980 gst_buffer_ref (buffer);
1981 gst_adapter_push (parse->priv->adapter, buffer);
1984 frame = gst_base_parse_prepare_frame (parse, buffer);
1985 ret = klass->handle_frame (parse, frame, skip);
1987 *flushed = parse->priv->flushed;
1989 GST_LOG_OBJECT (parse, "handle_frame skipped %d, flushed %d",
1992 /* subclass can only do one of these, or semantics are too unclear */
1993 g_assert (*skip == 0 || *flushed == 0);
1995 /* track skipping */
1997 GstClockTime pts, dts;
2000 GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", *skip);
2001 if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
2002 /* reverse playback, and no frames found yet, so we are skipping
2003 * the leading part of a fragment, which may form the tail of
2004 * fragment coming later, hopefully subclass skips efficiently ... */
2005 pts = gst_adapter_prev_pts (parse->priv->adapter, NULL);
2006 dts = gst_adapter_prev_dts (parse->priv->adapter, NULL);
2007 outbuf = gst_adapter_take_buffer (parse->priv->adapter, *skip);
2008 outbuf = gst_buffer_make_writable (outbuf);
2009 GST_BUFFER_PTS (outbuf) = pts;
2010 GST_BUFFER_DTS (outbuf) = dts;
2011 parse->priv->buffers_head =
2012 g_slist_prepend (parse->priv->buffers_head, outbuf);
2015 /* If we're asked to skip more than is available in the adapter,
2016 we need to remember what we need to skip for next iteration */
2017 gsize av = gst_adapter_available (parse->priv->adapter);
2018 GST_DEBUG ("Asked to skip %u (%" G_GSIZE_FORMAT " available)", *skip, av);
2020 gst_adapter_flush (parse->priv->adapter, *skip);
2023 ("This is more than available, flushing %" G_GSIZE_FORMAT
2024 ", storing %u to skip", av, (guint) (*skip - av));
2025 parse->priv->skip = *skip - av;
2026 gst_adapter_flush (parse->priv->adapter, av);
2030 if (!parse->priv->discont)
2031 parse->priv->sync_offset = parse->priv->offset;
2032 parse->priv->offset += *skip;
2033 parse->priv->discont = TRUE;
2034 /* check for indefinite skipping */
2035 if (ret == GST_FLOW_OK)
2036 ret = gst_base_parse_check_sync (parse);
2039 parse->priv->offset += *flushed;
2041 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
2042 gst_adapter_clear (parse->priv->adapter);
2045 gst_base_parse_frame_free (frame);
2050 /* gst_base_parse_push_pending_events:
2051 * @parse: #GstBaseParse
2053 * Pushes the pending events
2056 gst_base_parse_push_pending_events (GstBaseParse * parse)
2058 if (G_UNLIKELY (parse->priv->pending_events)) {
2059 GList *r = g_list_reverse (parse->priv->pending_events);
2062 parse->priv->pending_events = NULL;
2063 for (l = r; l != NULL; l = l->next) {
2064 gst_pad_push_event (parse->srcpad, GST_EVENT_CAST (l->data));
2070 /* gst_base_parse_handle_and_push_frame:
2071 * @parse: #GstBaseParse.
2072 * @klass: #GstBaseParseClass.
2073 * @frame: (transfer full): a #GstBaseParseFrame
2075 * Parses the frame from given buffer and pushes it forward. Also performs
2076 * timestamp handling and checks the segment limits.
2078 * This is called with srcpad STREAM_LOCK held.
2080 * Returns: #GstFlowReturn
2082 static GstFlowReturn
2083 gst_base_parse_handle_and_push_frame (GstBaseParse * parse,
2084 GstBaseParseFrame * frame)
2089 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2091 buffer = frame->buffer;
2092 offset = frame->offset;
2094 /* check if subclass/format can provide ts.
2095 * If so, that allows and enables extra seek and duration determining options */
2096 if (G_UNLIKELY (parse->priv->first_frame_offset < 0)) {
2097 if (GST_BUFFER_PTS_IS_VALID (buffer) && parse->priv->has_timing_info
2098 && parse->priv->pad_mode == GST_PAD_MODE_PULL) {
2099 parse->priv->first_frame_offset = offset;
2100 parse->priv->first_frame_pts = GST_BUFFER_PTS (buffer);
2101 parse->priv->first_frame_dts = GST_BUFFER_DTS (buffer);
2102 GST_DEBUG_OBJECT (parse, "subclass provided dts %" GST_TIME_FORMAT
2103 ", pts %" GST_TIME_FORMAT " for first frame at offset %"
2104 G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->first_frame_dts),
2105 GST_TIME_ARGS (parse->priv->first_frame_pts),
2106 parse->priv->first_frame_offset);
2107 if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
2109 GstClockTime last_ts = G_MAXINT64;
2111 GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
2112 gst_base_parse_locate_time (parse, &last_ts, &off);
2113 if (GST_CLOCK_TIME_IS_VALID (last_ts))
2114 gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
2117 /* disable further checks */
2118 parse->priv->first_frame_offset = 0;
2122 /* track upstream time if provided, not subclass' internal notion of it */
2123 if (parse->priv->upstream_format == GST_FORMAT_TIME) {
2124 GST_BUFFER_PTS (frame->buffer) = GST_CLOCK_TIME_NONE;
2125 GST_BUFFER_DTS (frame->buffer) = GST_CLOCK_TIME_NONE;
2128 /* interpolating and no valid pts yet,
2129 * start with dts and carry on from there */
2130 if (parse->priv->infer_ts && parse->priv->pts_interpolate
2131 && !GST_CLOCK_TIME_IS_VALID (parse->priv->next_pts))
2132 parse->priv->next_pts = parse->priv->next_dts;
2134 /* again use default handler to add missing metadata;
2135 * we may have new information on frame properties */
2136 gst_base_parse_parse_frame (parse, frame);
2138 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
2139 if (GST_BUFFER_DTS_IS_VALID (buffer) && GST_BUFFER_DURATION_IS_VALID (buffer)) {
2140 parse->priv->next_dts =
2141 GST_BUFFER_DTS (buffer) + GST_BUFFER_DURATION (buffer);
2142 if (parse->priv->pts_interpolate && GST_BUFFER_PTS_IS_VALID (buffer)) {
2143 GstClockTime next_pts =
2144 GST_BUFFER_PTS (buffer) + GST_BUFFER_DURATION (buffer);
2145 if (next_pts >= parse->priv->next_dts)
2146 parse->priv->next_pts = next_pts;
2149 /* we lost track, do not produce bogus time next time around
2150 * (probably means parser subclass has given up on parsing as well) */
2151 GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
2152 parse->priv->next_dts = GST_CLOCK_TIME_NONE;
2155 if (parse->priv->upstream_seekable && parse->priv->exact_position &&
2156 GST_BUFFER_PTS_IS_VALID (buffer))
2157 gst_base_parse_add_index_entry (parse, offset,
2158 GST_BUFFER_PTS (buffer),
2159 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
2161 /* All OK, push queued frames if there are any */
2162 if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
2163 GstBaseParseFrame *queued_frame;
2165 while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
2166 gst_base_parse_push_frame (parse, queued_frame);
2167 gst_base_parse_frame_free (queued_frame);
2171 return gst_base_parse_push_frame (parse, frame);
2175 * gst_base_parse_push_frame:
2176 * @parse: #GstBaseParse.
2177 * @frame: (transfer none): a #GstBaseParseFrame
2179 * Pushes the frame's buffer downstream, sends any pending events and
2180 * does some timestamp and segment handling. Takes ownership of
2181 * frame's buffer, though caller retains ownership of @frame.
2183 * This must be called with sinkpad STREAM_LOCK held.
2185 * Returns: #GstFlowReturn
2188 gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
2190 GstFlowReturn ret = GST_FLOW_OK;
2191 GstClockTime last_start = GST_CLOCK_TIME_NONE;
2192 GstClockTime last_stop = GST_CLOCK_TIME_NONE;
2193 GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
2197 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2198 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
2200 GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
2202 buffer = frame->buffer;
2204 GST_LOG_OBJECT (parse,
2205 "processing buffer of size %" G_GSIZE_FORMAT " with dts %" GST_TIME_FORMAT
2206 ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
2207 gst_buffer_get_size (buffer),
2208 GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
2209 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
2210 GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
2213 parse->priv->bytecount += frame->size;
2214 if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
2215 parse->priv->framecount++;
2216 if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
2217 parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
2220 /* 0 means disabled */
2221 if (parse->priv->update_interval < 0)
2222 parse->priv->update_interval = 50;
2223 else if (parse->priv->update_interval > 0 &&
2224 (parse->priv->framecount % parse->priv->update_interval) == 0)
2225 gst_base_parse_update_duration (parse);
2227 if (GST_BUFFER_PTS_IS_VALID (buffer))
2228 last_start = last_stop = GST_BUFFER_PTS (buffer);
2229 if (last_start != GST_CLOCK_TIME_NONE
2230 && GST_BUFFER_DURATION_IS_VALID (buffer))
2231 last_stop = last_start + GST_BUFFER_DURATION (buffer);
2233 /* should have caps by now */
2234 if (!gst_pad_has_current_caps (parse->srcpad))
2237 if (G_UNLIKELY (!parse->priv->checked_media)) {
2238 /* have caps; check identity */
2239 gst_base_parse_check_media (parse);
2242 /* Push pending events, including SEGMENT events */
2243 gst_base_parse_push_pending_events (parse);
2245 /* segment adjustment magic; only if we are running the whole show */
2246 if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
2247 (parse->priv->pad_mode == GST_PAD_MODE_PULL ||
2248 parse->priv->upstream_seekable)) {
2250 if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
2251 GST_CLOCK_TIME_IS_VALID (last_start)) {
2252 GstClockTimeDiff diff;
2254 /* only send newsegments with increasing start times,
2255 * otherwise if these go back and forth downstream (sinks) increase
2256 * accumulated time and running_time */
2257 diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
2258 if (G_UNLIKELY (diff > 2 * GST_SECOND
2259 && last_start > parse->segment.start
2260 && (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
2261 || last_start < parse->segment.stop))) {
2263 GST_DEBUG_OBJECT (parse,
2264 "Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
2265 GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
2266 "Sending updated SEGMENT events", diff,
2267 GST_TIME_ARGS (parse->segment.position),
2268 GST_TIME_ARGS (last_start));
2270 /* skip gap FIXME */
2271 gst_pad_push_event (parse->srcpad,
2272 gst_event_new_segment (&parse->segment));
2274 parse->segment.position = last_start;
2279 /* update bitrates and optionally post corresponding tags
2280 * (following newsegment) */
2281 gst_base_parse_update_bitrates (parse, frame);
2283 if (klass->pre_push_frame) {
2284 ret = klass->pre_push_frame (parse, frame);
2286 frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
2289 /* take final ownership of frame buffer */
2290 if (frame->out_buffer) {
2291 buffer = frame->out_buffer;
2292 frame->out_buffer = NULL;
2293 gst_buffer_replace (&frame->buffer, NULL);
2295 buffer = frame->buffer;
2296 frame->buffer = NULL;
2299 /* subclass must play nice */
2300 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
2302 size = gst_buffer_get_size (buffer);
2304 parse->priv->seen_keyframe |= parse->priv->is_video &&
2305 !GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
2307 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
2308 if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2309 GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
2310 GST_BUFFER_TIMESTAMP (buffer) >
2311 parse->segment.stop + parse->priv->lead_out_ts) {
2312 GST_LOG_OBJECT (parse, "Dropped frame, after segment");
2314 } else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
2315 GST_BUFFER_DURATION_IS_VALID (buffer) &&
2316 GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
2317 GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer) +
2318 parse->priv->lead_in_ts < parse->segment.start) {
2319 if (parse->priv->seen_keyframe) {
2320 GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
2323 GST_LOG_OBJECT (parse, "Dropped frame, before segment");
2324 ret = GST_BASE_PARSE_FLOW_DROPPED;
2331 if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
2332 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
2333 gst_buffer_unref (buffer);
2335 } else if (ret == GST_FLOW_OK) {
2336 if (parse->segment.rate > 0.0) {
2337 GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
2339 ret = gst_pad_push (parse->srcpad, buffer);
2340 GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
2341 } else if (!parse->priv->disable_passthrough && parse->priv->passthrough) {
2343 /* in backwards playback mode, if on passthrough we need to push buffers
2344 * directly without accumulating them into the buffers_queued as baseparse
2345 * will never check for a DISCONT while on passthrough and those buffers
2346 * will never be pushed.
2348 * also, as we are on reverse playback, it might be possible that
2349 * passthrough might have just been enabled, so make sure to drain the
2350 * buffers_queued list */
2351 if (G_UNLIKELY (parse->priv->buffers_queued != NULL)) {
2352 gst_base_parse_finish_fragment (parse, TRUE);
2353 ret = gst_base_parse_send_buffers (parse);
2356 if (ret == GST_FLOW_OK) {
2357 GST_LOG_OBJECT (parse,
2358 "pushing frame (%" G_GSIZE_FORMAT " bytes) now..", size);
2359 ret = gst_pad_push (parse->srcpad, buffer);
2360 GST_LOG_OBJECT (parse, "frame pushed, flow %s",
2361 gst_flow_get_name (ret));
2363 GST_LOG_OBJECT (parse,
2364 "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s", size,
2365 gst_flow_get_name (ret));
2366 gst_buffer_unref (buffer);
2370 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
2372 parse->priv->buffers_queued =
2373 g_slist_prepend (parse->priv->buffers_queued, buffer);
2377 GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
2378 size, gst_flow_get_name (ret));
2379 gst_buffer_unref (buffer);
2380 /* if we are not sufficiently in control, let upstream decide on EOS */
2381 if (ret == GST_FLOW_EOS && !parse->priv->disable_passthrough &&
2382 (parse->priv->passthrough ||
2383 (parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
2384 !parse->priv->upstream_seekable)))
2388 /* Update current running segment position */
2389 if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE &&
2390 parse->segment.position < last_stop)
2391 parse->segment.position = last_stop;
2398 if (GST_PAD_IS_FLUSHING (parse->srcpad))
2399 return GST_FLOW_FLUSHING;
2401 GST_ELEMENT_ERROR (parse, STREAM, DECODE, ("No caps set"), (NULL));
2402 return GST_FLOW_ERROR;
2407 * gst_base_parse_finish_frame:
2408 * @parse: a #GstBaseParse
2409 * @frame: a #GstBaseParseFrame
2410 * @size: consumed input data represented by frame
2412 * Collects parsed data and pushes this downstream.
2413 * Source pad caps must be set when this is called.
2415 * If @frame's out_buffer is set, that will be used as subsequent frame data.
2416 * Otherwise, @size samples will be taken from the input and used for output,
2417 * and the output's metadata (timestamps etc) will be taken as (optionally)
2418 * set by the subclass on @frame's (input) buffer (which is otherwise
2419 * ignored for any but the above purpose/information).
2421 * Note that the latter buffer is invalidated by this call, whereas the
2422 * caller retains ownership of @frame.
2424 * Returns: a #GstFlowReturn that should be escalated to caller (of caller)
2427 gst_base_parse_finish_frame (GstBaseParse * parse, GstBaseParseFrame * frame,
2430 GstFlowReturn ret = GST_FLOW_OK;
2432 g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
2433 g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
2434 g_return_val_if_fail (size > 0 || frame->out_buffer, GST_FLOW_ERROR);
2435 g_return_val_if_fail (gst_adapter_available (parse->priv->adapter) >= size,
2438 GST_LOG_OBJECT (parse, "finished frame at offset %" G_GUINT64_FORMAT ", "
2439 "flushing size %d", frame->offset, size);
2441 /* some one-time start-up */
2442 if (G_UNLIKELY (parse->priv->framecount == 0)) {
2443 gst_base_parse_check_seekability (parse);
2444 gst_base_parse_check_upstream (parse);
2447 parse->priv->flushed += size;
2449 if (parse->priv->scanning && frame->buffer) {
2450 if (!parse->priv->scanned_frame) {
2451 parse->priv->scanned_frame = gst_base_parse_frame_copy (frame);
2456 /* either PUSH or PULL mode arranges for adapter data */
2457 /* ensure output buffer */
2458 if (!frame->out_buffer) {
2459 GstBuffer *src, *dest;
2461 frame->out_buffer = gst_adapter_take_buffer (parse->priv->adapter, size);
2462 dest = frame->out_buffer;
2463 src = frame->buffer;
2464 GST_BUFFER_PTS (dest) = GST_BUFFER_PTS (src);
2465 GST_BUFFER_DTS (dest) = GST_BUFFER_DTS (src);
2466 GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src);
2467 GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src);
2468 GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src);
2469 GST_MINI_OBJECT_FLAGS (dest) = GST_MINI_OBJECT_FLAGS (src);
2471 gst_adapter_flush (parse->priv->adapter, size);
2474 /* use as input for subsequent processing */
2475 gst_buffer_replace (&frame->buffer, frame->out_buffer);
2476 gst_buffer_unref (frame->out_buffer);
2477 frame->out_buffer = NULL;
2479 /* mark input size consumed */
2482 /* subclass might queue frames/data internally if it needs more
2483 * frames to decide on the format, or might request us to queue here. */
2484 if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_DROP) {
2485 gst_buffer_replace (&frame->buffer, NULL);
2487 } else if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_QUEUE) {
2488 GstBaseParseFrame *copy;
2490 copy = gst_base_parse_frame_copy (frame);
2491 copy->flags &= ~GST_BASE_PARSE_FRAME_FLAG_QUEUE;
2492 gst_base_parse_queue_frame (parse, copy);
2496 ret = gst_base_parse_handle_and_push_frame (parse, frame);
2502 /* gst_base_parse_drain:
2504 * Drains the adapter until it is empty. It decreases the min_frame_size to
2505 * match the current adapter size and calls chain method until the adapter
2506 * is emptied or chain returns with error.
2509 gst_base_parse_drain (GstBaseParse * parse)
2513 GST_DEBUG_OBJECT (parse, "draining");
2514 parse->priv->drain = TRUE;
2517 avail = gst_adapter_available (parse->priv->adapter);
2521 if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
2522 NULL) != GST_FLOW_OK) {
2526 /* nothing changed, maybe due to truncated frame; break infinite loop */
2527 if (avail == gst_adapter_available (parse->priv->adapter)) {
2528 GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
2529 gst_adapter_clear (parse->priv->adapter);
2533 parse->priv->drain = FALSE;
2536 /* gst_base_parse_send_buffers
2538 * Sends buffers collected in send_buffers downstream, and ensures that list
2539 * is empty at the end (errors or not).
2541 static GstFlowReturn
2542 gst_base_parse_send_buffers (GstBaseParse * parse)
2544 GSList *send = NULL;
2546 GstFlowReturn ret = GST_FLOW_OK;
2547 gboolean first = TRUE;
2549 send = parse->priv->buffers_send;
2553 buf = GST_BUFFER_CAST (send->data);
2554 GST_LOG_OBJECT (parse, "pushing buffer %p, dts %"
2555 GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
2556 ", offset %" G_GINT64_FORMAT, buf,
2557 GST_TIME_ARGS (GST_BUFFER_DTS (buf)),
2558 GST_TIME_ARGS (GST_BUFFER_PTS (buf)),
2559 GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
2561 /* Make sure the first buffer is always DISCONT. If we split
2562 * GOPs inside the parser this is otherwise not guaranteed */
2564 GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
2568 /* iterate output queue an push downstream */
2569 ret = gst_pad_push (parse->srcpad, buf);
2570 send = g_slist_delete_link (send, send);
2572 /* clear any leftover if error */
2573 if (G_UNLIKELY (ret != GST_FLOW_OK)) {
2575 buf = GST_BUFFER_CAST (send->data);
2576 gst_buffer_unref (buf);
2577 send = g_slist_delete_link (send, send);
2582 parse->priv->buffers_send = send;
2587 /* gst_base_parse_start_fragment:
2589 * Prepares for processing a reverse playback (forward) fragment
2590 * by (re)setting proper state variables.
2592 static GstFlowReturn
2593 gst_base_parse_start_fragment (GstBaseParse * parse)
2595 GST_LOG_OBJECT (parse, "starting fragment");
2597 /* invalidate so no fall-back timestamping is performed;
2598 * ok if taken from subclass or upstream */
2599 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
2600 parse->priv->prev_pts = GST_CLOCK_TIME_NONE;
2601 parse->priv->next_dts = GST_CLOCK_TIME_NONE;
2602 parse->priv->prev_dts = GST_CLOCK_TIME_NONE;
2603 /* prevent it hanging around stop all the time */
2604 parse->segment.position = GST_CLOCK_TIME_NONE;
2606 parse->priv->discont = TRUE;
2608 /* head of previous fragment is now pending tail of current fragment */
2609 parse->priv->buffers_pending = parse->priv->buffers_head;
2610 parse->priv->buffers_head = NULL;
2616 /* gst_base_parse_finish_fragment:
2618 * Processes a reverse playback (forward) fragment:
2619 * - append head of last fragment that was skipped to current fragment data
2620 * - drain the resulting current fragment data (i.e. repeated chain)
2621 * - add time/duration (if needed) to frames queued by chain
2622 * - push queued data
2624 static GstFlowReturn
2625 gst_base_parse_finish_fragment (GstBaseParse * parse, gboolean prev_head)
2628 GstFlowReturn ret = GST_FLOW_OK;
2629 gboolean seen_key = FALSE, seen_delta = FALSE;
2631 GST_LOG_OBJECT (parse, "finishing fragment");
2634 parse->priv->buffers_pending = g_slist_reverse (parse->priv->buffers_pending);
2635 while (parse->priv->buffers_pending) {
2636 buf = GST_BUFFER_CAST (parse->priv->buffers_pending->data);
2638 GST_LOG_OBJECT (parse, "adding pending buffer (size %" G_GSIZE_FORMAT ")",
2639 gst_buffer_get_size (buf));
2640 gst_adapter_push (parse->priv->adapter, buf);
2642 GST_LOG_OBJECT (parse, "discarding head buffer");
2643 gst_buffer_unref (buf);
2645 parse->priv->buffers_pending =
2646 g_slist_delete_link (parse->priv->buffers_pending,
2647 parse->priv->buffers_pending);
2650 /* chain looks for frames and queues resulting ones (in stead of pushing) */
2651 /* initial skipped data is added to buffers_pending */
2652 gst_base_parse_drain (parse);
2654 if (parse->priv->buffers_send) {
2655 buf = GST_BUFFER_CAST (parse->priv->buffers_send->data);
2656 seen_key |= !GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT);
2659 /* add metadata (if needed to queued buffers */
2660 GST_LOG_OBJECT (parse, "last timestamp: %" GST_TIME_FORMAT,
2661 GST_TIME_ARGS (parse->priv->last_pts));
2662 while (parse->priv->buffers_queued) {
2663 buf = GST_BUFFER_CAST (parse->priv->buffers_queued->data);
2665 /* no touching if upstream or parsing provided time */
2666 if (GST_BUFFER_PTS_IS_VALID (buf)) {
2667 GST_LOG_OBJECT (parse, "buffer has time %" GST_TIME_FORMAT,
2668 GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
2669 } else if (GST_BUFFER_DURATION_IS_VALID (buf)) {
2670 if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_pts)) {
2671 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_pts))
2672 parse->priv->last_pts -= GST_BUFFER_DURATION (buf);
2674 parse->priv->last_pts = 0;
2675 GST_BUFFER_PTS (buf) = parse->priv->last_pts;
2676 GST_LOG_OBJECT (parse, "applied time %" GST_TIME_FORMAT,
2677 GST_TIME_ARGS (GST_BUFFER_PTS (buf)));
2679 if (GST_CLOCK_TIME_IS_VALID (parse->priv->last_dts)) {
2680 if (G_LIKELY (GST_BUFFER_DURATION (buf) <= parse->priv->last_dts))
2681 parse->priv->last_dts -= GST_BUFFER_DURATION (buf);
2683 parse->priv->last_dts = 0;
2684 GST_BUFFER_DTS (buf) = parse->priv->last_dts;
2685 GST_LOG_OBJECT (parse, "applied dts %" GST_TIME_FORMAT,
2686 GST_TIME_ARGS (GST_BUFFER_DTS (buf)));
2689 /* no idea, very bad */
2690 GST_WARNING_OBJECT (parse, "could not determine time for buffer");
2693 parse->priv->last_pts = GST_BUFFER_PTS (buf);
2694 parse->priv->last_dts = GST_BUFFER_DTS (buf);
2696 /* reverse order for ascending sending */
2697 /* send downstream at keyframe not preceded by a keyframe
2698 * (e.g. that should identify start of collection of IDR nals) */
2699 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT)) {
2701 ret = gst_base_parse_send_buffers (parse);
2702 /* if a problem, throw all to sending */
2703 if (ret != GST_FLOW_OK) {
2704 parse->priv->buffers_send =
2705 g_slist_reverse (parse->priv->buffers_queued);
2706 parse->priv->buffers_queued = NULL;
2716 parse->priv->buffers_send =
2717 g_slist_prepend (parse->priv->buffers_send, buf);
2718 parse->priv->buffers_queued =
2719 g_slist_delete_link (parse->priv->buffers_queued,
2720 parse->priv->buffers_queued);
2723 /* audio may have all marked as keyframe, so arrange to send here. Also
2724 * we might have ended the loop above on a keyframe, in which case we
2726 if (!seen_delta || seen_key)
2727 ret = gst_base_parse_send_buffers (parse);
2729 /* any trailing unused no longer usable (ideally none) */
2730 if (G_UNLIKELY (gst_adapter_available (parse->priv->adapter))) {
2731 GST_DEBUG_OBJECT (parse, "discarding %" G_GSIZE_FORMAT " trailing bytes",
2732 gst_adapter_available (parse->priv->adapter));
2733 gst_adapter_clear (parse->priv->adapter);
2739 /* small helper that checks whether we have been trying to resync too long */
2740 static inline GstFlowReturn
2741 gst_base_parse_check_sync (GstBaseParse * parse)
2743 if (G_UNLIKELY (parse->priv->discont &&
2744 parse->priv->offset - parse->priv->sync_offset > 2 * 1024 * 1024)) {
2745 GST_ELEMENT_ERROR (parse, STREAM, DECODE,
2746 ("Failed to parse stream"), (NULL));
2747 return GST_FLOW_ERROR;
2753 static GstFlowReturn
2754 gst_base_parse_process_streamheader (GstBaseParse * parse)
2758 const GValue *value;
2759 GstFlowReturn ret = GST_FLOW_OK;
2761 caps = gst_pad_get_current_caps (GST_BASE_PARSE_SINK_PAD (parse));
2765 str = gst_caps_get_structure (caps, 0);
2766 value = gst_structure_get_value (str, "streamheader");
2770 GST_DEBUG_OBJECT (parse, "Found streamheader field on input caps");
2772 if (GST_VALUE_HOLDS_ARRAY (value)) {
2774 gsize len = gst_value_array_get_size (value);
2776 for (i = 0; i < len; i++) {
2778 gst_value_get_buffer (gst_value_array_get_value (value, i));
2780 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2781 GST_OBJECT_CAST (parse), gst_buffer_ref (buffer));
2784 } else if (GST_VALUE_HOLDS_BUFFER (value)) {
2785 GstBuffer *buffer = gst_value_get_buffer (value);
2787 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2788 GST_OBJECT_CAST (parse), gst_buffer_ref (buffer));
2791 gst_caps_unref (caps);
2798 gst_caps_unref (caps);
2801 GST_DEBUG_OBJECT (parse, "No streamheader on caps");
2806 static GstFlowReturn
2807 gst_base_parse_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
2809 GstBaseParseClass *bclass;
2810 GstBaseParse *parse;
2811 GstFlowReturn ret = GST_FLOW_OK;
2812 GstFlowReturn old_ret = GST_FLOW_OK;
2813 GstBuffer *tmpbuf = NULL;
2817 GstClockTime pts, dts;
2819 parse = GST_BASE_PARSE (parent);
2820 bclass = GST_BASE_PARSE_GET_CLASS (parse);
2821 GST_DEBUG_OBJECT (parent, "chain");
2823 /* early out for speed, if we need to skip */
2824 if (buffer && GST_BUFFER_IS_DISCONT (buffer))
2825 parse->priv->skip = 0;
2826 if (parse->priv->skip > 0) {
2827 gsize bsize = gst_buffer_get_size (buffer);
2828 GST_DEBUG ("Got %" G_GSIZE_FORMAT " buffer, need to skip %u", bsize,
2830 if (parse->priv->skip >= bsize) {
2831 parse->priv->skip -= bsize;
2832 GST_DEBUG ("All the buffer is skipped");
2833 parse->priv->offset += bsize;
2834 parse->priv->sync_offset = parse->priv->offset;
2837 buffer = gst_buffer_make_writable (buffer);
2838 gst_buffer_resize (buffer, parse->priv->skip, bsize - parse->priv->skip);
2839 parse->priv->offset += parse->priv->skip;
2840 GST_DEBUG ("Done skipping, we have %u left on this buffer",
2841 (unsigned) (bsize - parse->priv->skip));
2842 parse->priv->skip = 0;
2843 parse->priv->discont = TRUE;
2846 if (G_UNLIKELY (parse->priv->first_buffer)) {
2847 parse->priv->first_buffer = FALSE;
2848 if (!GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_HEADER)) {
2849 /* this stream has no header buffers, check if we just prepend the
2850 * streamheader from caps to the stream */
2851 GST_DEBUG_OBJECT (parse, "Looking for streamheader field on caps to "
2852 "prepend to the stream");
2853 gst_base_parse_process_streamheader (parse);
2855 GST_DEBUG_OBJECT (parse, "Stream has header buffers, not prepending "
2856 "streamheader from caps");
2860 if (parse->priv->detecting) {
2861 GstBuffer *detect_buf;
2863 if (parse->priv->detect_buffers_size == 0) {
2864 detect_buf = gst_buffer_ref (buffer);
2869 detect_buf = gst_buffer_new ();
2871 for (l = parse->priv->detect_buffers; l; l = l->next) {
2872 gsize tmpsize = gst_buffer_get_size (l->data);
2874 gst_buffer_copy_into (detect_buf, GST_BUFFER_CAST (l->data),
2875 GST_BUFFER_COPY_MEMORY, offset, tmpsize);
2879 gst_buffer_copy_into (detect_buf, buffer, GST_BUFFER_COPY_MEMORY,
2880 offset, gst_buffer_get_size (buffer));
2883 ret = bclass->detect (parse, detect_buf);
2884 gst_buffer_unref (detect_buf);
2886 if (ret == GST_FLOW_OK) {
2889 /* Detected something */
2890 parse->priv->detecting = FALSE;
2892 for (l = parse->priv->detect_buffers; l; l = l->next) {
2893 if (ret == GST_FLOW_OK && !parse->priv->flushing)
2895 gst_base_parse_chain (GST_BASE_PARSE_SINK_PAD (parse),
2896 parent, GST_BUFFER_CAST (l->data));
2898 gst_buffer_unref (GST_BUFFER_CAST (l->data));
2900 g_list_free (parse->priv->detect_buffers);
2901 parse->priv->detect_buffers = NULL;
2902 parse->priv->detect_buffers_size = 0;
2904 if (ret != GST_FLOW_OK) {
2908 /* Handle the current buffer */
2909 } else if (ret == GST_FLOW_NOT_NEGOTIATED) {
2910 /* Still detecting, append buffer or error out if draining */
2912 if (parse->priv->drain) {
2913 GST_DEBUG_OBJECT (parse, "Draining but did not detect format yet");
2914 return GST_FLOW_ERROR;
2915 } else if (parse->priv->flushing) {
2916 g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref,
2918 g_list_free (parse->priv->detect_buffers);
2919 parse->priv->detect_buffers = NULL;
2920 parse->priv->detect_buffers_size = 0;
2922 parse->priv->detect_buffers =
2923 g_list_append (parse->priv->detect_buffers, buffer);
2924 parse->priv->detect_buffers_size += gst_buffer_get_size (buffer);
2928 /* Something went wrong, subclass responsible for error reporting */
2932 /* And now handle the current buffer if detection worked */
2935 if (G_LIKELY (buffer)) {
2936 GST_LOG_OBJECT (parse,
2937 "buffer size: %" G_GSIZE_FORMAT ", offset = %" G_GINT64_FORMAT
2938 ", dts %" GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT,
2939 gst_buffer_get_size (buffer), GST_BUFFER_OFFSET (buffer),
2940 GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
2941 GST_TIME_ARGS (GST_BUFFER_PTS (buffer)));
2943 if (G_UNLIKELY (!parse->priv->disable_passthrough
2944 && parse->priv->passthrough)) {
2945 GstBaseParseFrame frame;
2947 gst_base_parse_frame_init (&frame);
2948 frame.buffer = gst_buffer_make_writable (buffer);
2949 ret = gst_base_parse_push_frame (parse, &frame);
2950 gst_base_parse_frame_free (&frame);
2953 if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))) {
2954 /* upstream feeding us in reverse playback;
2955 * finish previous fragment and start new upon DISCONT */
2956 if (parse->segment.rate < 0.0) {
2957 GST_DEBUG_OBJECT (parse, "buffer starts new reverse playback fragment");
2958 ret = gst_base_parse_finish_fragment (parse, TRUE);
2959 gst_base_parse_start_fragment (parse);
2961 /* discont in the stream, drain and mark discont for next output */
2962 gst_base_parse_drain (parse);
2963 parse->priv->discont = TRUE;
2966 gst_adapter_push (parse->priv->adapter, buffer);
2969 /* Parse and push as many frames as possible */
2970 /* Stop either when adapter is empty or we are flushing */
2971 while (!parse->priv->flushing) {
2974 /* note: if subclass indicates MAX fsize,
2975 * this will not likely be available anyway ... */
2976 min_size = MAX (parse->priv->min_frame_size, fsize);
2977 av = gst_adapter_available (parse->priv->adapter);
2979 if (G_UNLIKELY (parse->priv->drain)) {
2981 GST_DEBUG_OBJECT (parse, "draining, data left: %d", min_size);
2982 if (G_UNLIKELY (!min_size)) {
2987 /* Collect at least min_frame_size bytes */
2988 if (av < min_size) {
2989 GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)", av);
2993 /* move along with upstream timestamp (if any),
2994 * but interpolate in between */
2995 pts = gst_adapter_prev_pts (parse->priv->adapter, NULL);
2996 dts = gst_adapter_prev_dts (parse->priv->adapter, NULL);
2997 if (GST_CLOCK_TIME_IS_VALID (pts) && (parse->priv->prev_pts != pts))
2998 parse->priv->prev_pts = parse->priv->next_pts = pts;
3000 if (GST_CLOCK_TIME_IS_VALID (dts) && (parse->priv->prev_dts != dts))
3001 parse->priv->prev_dts = parse->priv->next_dts = dts;
3003 /* we can mess with, erm interpolate, timestamps,
3004 * and incoming stuff has PTS but no DTS seen so far,
3005 * then pick up DTS from PTS and hope for the best ... */
3006 if (parse->priv->infer_ts &&
3007 parse->priv->pts_interpolate &&
3008 !GST_CLOCK_TIME_IS_VALID (dts) &&
3009 !GST_CLOCK_TIME_IS_VALID (parse->priv->prev_dts) &&
3010 GST_CLOCK_TIME_IS_VALID (pts))
3011 parse->priv->next_dts = pts;
3013 /* always pass all available data */
3014 tmpbuf = gst_adapter_get_buffer (parse->priv->adapter, av);
3016 /* already inform subclass what timestamps we have planned,
3017 * at least if provided by time-based upstream */
3018 if (parse->priv->upstream_format == GST_FORMAT_TIME) {
3019 GST_BUFFER_PTS (tmpbuf) = parse->priv->next_pts;
3020 GST_BUFFER_DTS (tmpbuf) = parse->priv->next_dts;
3023 /* keep the adapter mapped, so keep track of what has to be flushed */
3024 ret = gst_base_parse_handle_buffer (parse, tmpbuf, &skip, &flush);
3027 if (ret != GST_FLOW_OK && ret != GST_FLOW_NOT_LINKED) {
3030 if (skip == 0 && flush == 0) {
3031 GST_LOG_OBJECT (parse, "nothing skipped and no frames finished, "
3032 "breaking to get more data");
3033 /* ignore this return as it produced no data */
3041 GST_LOG_OBJECT (parse, "chain leaving");
3045 /* pull @size bytes at current offset,
3046 * i.e. at least try to and possibly return a shorter buffer if near the end */
3047 static GstFlowReturn
3048 gst_base_parse_pull_range (GstBaseParse * parse, guint size,
3049 GstBuffer ** buffer)
3051 GstFlowReturn ret = GST_FLOW_OK;
3053 g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
3055 /* Caching here actually makes much less difference than one would expect.
3056 * We do it mainly to avoid pulling buffers of 1 byte all the time */
3057 if (parse->priv->cache) {
3058 gint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
3059 gint cache_size = gst_buffer_get_size (parse->priv->cache);
3061 if (cache_offset <= parse->priv->offset &&
3062 (parse->priv->offset + size) <= (cache_offset + cache_size)) {
3063 *buffer = gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL,
3064 parse->priv->offset - cache_offset, size);
3065 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
3068 /* not enough data in the cache, free cache and get a new one */
3069 gst_buffer_unref (parse->priv->cache);
3070 parse->priv->cache = NULL;
3073 /* refill the cache */
3075 gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
3076 64 * 1024), &parse->priv->cache);
3077 if (ret != GST_FLOW_OK) {
3078 parse->priv->cache = NULL;
3082 if (gst_buffer_get_size (parse->priv->cache) >= size) {
3084 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0,
3086 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
3090 /* Not possible to get enough data, try a last time with
3091 * requesting exactly the size we need */
3092 gst_buffer_unref (parse->priv->cache);
3093 parse->priv->cache = NULL;
3095 ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
3096 &parse->priv->cache);
3098 if (ret != GST_FLOW_OK) {
3099 GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
3104 if (gst_buffer_get_size (parse->priv->cache) < size) {
3105 GST_DEBUG_OBJECT (parse, "Returning short buffer at offset %"
3106 G_GUINT64_FORMAT ": wanted %u bytes, got %" G_GSIZE_FORMAT " bytes",
3107 parse->priv->offset, size, gst_buffer_get_size (parse->priv->cache));
3109 *buffer = parse->priv->cache;
3110 parse->priv->cache = NULL;
3116 gst_buffer_copy_region (parse->priv->cache, GST_BUFFER_COPY_ALL, 0, size);
3117 GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
3122 static GstFlowReturn
3123 gst_base_parse_handle_previous_fragment (GstBaseParse * parse)
3126 GstClockTime ts = 0;
3130 GST_DEBUG_OBJECT (parse, "fragment ended; last_ts = %" GST_TIME_FORMAT
3131 ", last_offset = %" G_GINT64_FORMAT,
3132 GST_TIME_ARGS (parse->priv->last_pts), parse->priv->last_offset);
3134 if (!parse->priv->last_offset
3135 || parse->priv->last_pts <= parse->segment.start) {
3136 GST_DEBUG_OBJECT (parse, "past start of segment %" GST_TIME_FORMAT,
3137 GST_TIME_ARGS (parse->segment.start));
3142 /* last fragment started at last_offset / last_ts;
3143 * seek back 10s capped at 1MB */
3144 if (parse->priv->last_pts >= 10 * GST_SECOND)
3145 ts = parse->priv->last_pts - 10 * GST_SECOND;
3146 /* if we are exact now, we will be more so going backwards */
3147 if (parse->priv->exact_position) {
3148 offset = gst_base_parse_find_offset (parse, ts, TRUE, NULL);
3150 if (!gst_base_parse_convert (parse, GST_FORMAT_TIME, ts,
3151 GST_FORMAT_BYTES, &offset)) {
3152 GST_DEBUG_OBJECT (parse, "conversion failed, only BYTE based");
3155 offset = CLAMP (offset, parse->priv->last_offset - 1024 * 1024,
3156 parse->priv->last_offset - 1024);
3157 offset = MAX (0, offset);
3159 GST_DEBUG_OBJECT (parse, "next fragment from offset %" G_GINT64_FORMAT,
3161 parse->priv->offset = offset;
3163 ret = gst_base_parse_pull_range (parse, parse->priv->last_offset - offset,
3165 if (ret != GST_FLOW_OK)
3168 /* offset will increase again as fragment is processed/parsed */
3169 parse->priv->last_offset = offset;
3171 gst_base_parse_start_fragment (parse);
3172 gst_adapter_push (parse->priv->adapter, buffer);
3173 ret = gst_base_parse_finish_fragment (parse, TRUE);
3174 if (ret != GST_FLOW_OK)
3177 /* force previous fragment */
3178 parse->priv->offset = -1;
3185 * pull and scan for next frame starting from current offset
3186 * ajusts sync, drain and offset going along */
3187 static GstFlowReturn
3188 gst_base_parse_scan_frame (GstBaseParse * parse, GstBaseParseClass * klass)
3191 GstFlowReturn ret = GST_FLOW_OK;
3192 guint fsize, min_size;
3196 GST_LOG_OBJECT (parse, "scanning for frame at offset %" G_GUINT64_FORMAT
3197 " (%#" G_GINT64_MODIFIER "x)", parse->priv->offset, parse->priv->offset);
3199 /* let's make this efficient for all subclass once and for all;
3200 * maybe it does not need this much, but in the latter case, we know we are
3201 * in pull mode here and might as well try to read and supply more anyway
3202 * (so does the buffer caching mechanism) */
3206 min_size = MAX (parse->priv->min_frame_size, fsize);
3208 GST_LOG_OBJECT (parse, "reading buffer size %u", min_size);
3210 ret = gst_base_parse_pull_range (parse, min_size, &buffer);
3211 if (ret != GST_FLOW_OK)
3214 /* if we got a short read, inform subclass we are draining leftover
3215 * and no more is to be expected */
3216 if (gst_buffer_get_size (buffer) < min_size) {
3217 GST_LOG_OBJECT (parse, "... but did not get that; marked draining");
3218 parse->priv->drain = TRUE;
3221 if (parse->priv->detecting) {
3222 ret = klass->detect (parse, buffer);
3223 if (ret == GST_FLOW_NOT_NEGOTIATED) {
3224 /* If draining we error out, otherwise request a buffer
3226 if (parse->priv->drain) {
3227 gst_buffer_unref (buffer);
3228 GST_ERROR_OBJECT (parse, "Failed to detect format but draining");
3229 return GST_FLOW_ERROR;
3232 gst_buffer_unref (buffer);
3235 } else if (ret != GST_FLOW_OK) {
3236 gst_buffer_unref (buffer);
3237 GST_ERROR_OBJECT (parse, "detect() returned %s",
3238 gst_flow_get_name (ret));
3242 /* Else handle this buffer normally */
3245 ret = gst_base_parse_handle_buffer (parse, buffer, &skip, &flushed);
3246 if (ret != GST_FLOW_OK)
3249 /* If a large amount of data was requested to be skipped, _handle_buffer
3250 might have set the priv->skip flag to an extra amount on top of skip.
3251 In pull mode, we can just pull from the new offset directly. */
3252 parse->priv->offset += parse->priv->skip;
3253 parse->priv->skip = 0;
3255 /* something flushed means something happened,
3256 * and we should bail out of this loop so as not to occupy
3257 * the task thread indefinitely */
3259 GST_LOG_OBJECT (parse, "frame finished, breaking loop");
3262 /* nothing flushed, no skip and draining, so nothing left to do */
3263 if (!skip && parse->priv->drain) {
3264 GST_LOG_OBJECT (parse, "no activity or result when draining; "
3265 "breaking loop and marking EOS");
3269 /* otherwise, get some more data
3270 * note that is checked this does not happen indefinitely */
3272 GST_LOG_OBJECT (parse, "getting some more data");
3275 parse->priv->drain = FALSE;
3282 /* Loop that is used in pull mode to retrieve data from upstream */
3284 gst_base_parse_loop (GstPad * pad)
3286 GstBaseParse *parse;
3287 GstBaseParseClass *klass;
3288 GstFlowReturn ret = GST_FLOW_OK;
3290 parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
3291 klass = GST_BASE_PARSE_GET_CLASS (parse);
3293 GST_LOG_OBJECT (parse, "Entering parse loop");
3295 if (G_UNLIKELY (parse->priv->push_stream_start)) {
3300 gst_pad_create_stream_id (parse->srcpad, GST_ELEMENT_CAST (parse),
3303 event = gst_event_new_stream_start (stream_id);
3304 gst_event_set_group_id (event, gst_util_group_id_next ());
3306 GST_DEBUG_OBJECT (parse, "Pushing STREAM_START");
3307 gst_pad_push_event (parse->srcpad, event);
3308 parse->priv->push_stream_start = FALSE;
3312 /* reverse playback:
3313 * first fragment (closest to stop time) is handled normally below,
3314 * then we pull in fragments going backwards */
3315 if (parse->segment.rate < 0.0) {
3316 /* check if we jumped back to a previous fragment,
3317 * which is a post-first fragment */
3318 if (parse->priv->offset < 0) {
3319 ret = gst_base_parse_handle_previous_fragment (parse);
3324 ret = gst_base_parse_scan_frame (parse, klass);
3325 if (ret != GST_FLOW_OK)
3328 /* eat expected eos signalling past segment in reverse playback */
3329 if (parse->segment.rate < 0.0 && ret == GST_FLOW_EOS &&
3330 parse->segment.position >= parse->segment.stop) {
3331 GST_DEBUG_OBJECT (parse, "downstream has reached end of segment");
3332 /* push what was accumulated during loop run */
3333 gst_base_parse_finish_fragment (parse, FALSE);
3334 /* force previous fragment */
3335 parse->priv->offset = -1;
3340 if (ret == GST_FLOW_EOS)
3342 else if (ret != GST_FLOW_OK)
3345 gst_object_unref (parse);
3352 GST_DEBUG_OBJECT (parse, "eos");
3357 gboolean push_eos = FALSE;
3359 GST_DEBUG_OBJECT (parse, "pausing task, reason %s",
3360 gst_flow_get_name (ret));
3361 gst_pad_pause_task (parse->sinkpad);
3363 if (ret == GST_FLOW_EOS) {
3364 /* handle end-of-stream/segment */
3365 if (parse->segment.flags & GST_SEGMENT_FLAG_SEGMENT) {
3368 if ((stop = parse->segment.stop) == -1)
3369 stop = parse->segment.duration;
3371 GST_DEBUG_OBJECT (parse, "sending segment_done");
3373 gst_element_post_message
3374 (GST_ELEMENT_CAST (parse),
3375 gst_message_new_segment_done (GST_OBJECT_CAST (parse),
3376 GST_FORMAT_TIME, stop));
3377 gst_pad_push_event (parse->srcpad,
3378 gst_event_new_segment_done (GST_FORMAT_TIME, stop));
3380 /* If we STILL have zero frames processed, fire an error */
3381 if (parse->priv->framecount == 0) {
3382 GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
3383 ("No valid frames found before end of stream"), (NULL));
3387 } else if (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS) {
3388 /* for fatal errors we post an error message, wrong-state is
3389 * not fatal because it happens due to flushes and only means
3390 * that we should stop now. */
3391 GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
3392 ("streaming stopped, reason %s", gst_flow_get_name (ret)));
3396 /* Push pending events, including SEGMENT events */
3397 gst_base_parse_push_pending_events (parse);
3399 gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
3401 gst_object_unref (parse);
3406 gst_base_parse_sink_activate (GstPad * sinkpad, GstObject * parent)
3408 GstSchedulingFlags sched_flags;
3409 GstBaseParse *parse;
3413 parse = GST_BASE_PARSE (parent);
3415 GST_DEBUG_OBJECT (parse, "sink activate");
3417 query = gst_query_new_scheduling ();
3418 if (!gst_pad_peer_query (sinkpad, query)) {
3419 gst_query_unref (query);
3420 goto baseparse_push;
3423 gst_query_parse_scheduling (query, &sched_flags, NULL, NULL, NULL);
3425 pull_mode = gst_query_has_scheduling_mode (query, GST_PAD_MODE_PULL)
3426 && ((sched_flags & GST_SCHEDULING_FLAG_SEEKABLE) != 0);
3428 gst_query_unref (query);
3431 goto baseparse_push;
3433 GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
3434 if (!gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PULL, TRUE))
3435 goto baseparse_push;
3437 parse->priv->push_stream_start = TRUE;
3439 return gst_pad_start_task (sinkpad, (GstTaskFunction) gst_base_parse_loop,
3444 GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
3445 return gst_pad_activate_mode (sinkpad, GST_PAD_MODE_PUSH, TRUE);
3450 gst_base_parse_activate (GstBaseParse * parse, gboolean active)
3452 GstBaseParseClass *klass;
3453 gboolean result = TRUE;
3455 GST_DEBUG_OBJECT (parse, "activate %d", active);
3457 klass = GST_BASE_PARSE_GET_CLASS (parse);
3460 if (parse->priv->pad_mode == GST_PAD_MODE_NONE && klass->start)
3461 result = klass->start (parse);
3463 /* If the subclass implements ::detect we want to
3464 * call it for the first buffers now */
3465 parse->priv->detecting = (klass->detect != NULL);
3467 /* We must make sure streaming has finished before resetting things
3468 * and calling the ::stop vfunc */
3469 GST_PAD_STREAM_LOCK (parse->sinkpad);
3470 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
3472 if (parse->priv->pad_mode != GST_PAD_MODE_NONE && klass->stop)
3473 result = klass->stop (parse);
3475 parse->priv->pad_mode = GST_PAD_MODE_NONE;
3477 GST_DEBUG_OBJECT (parse, "activate return: %d", result);
3482 gst_base_parse_sink_activate_mode (GstPad * pad, GstObject * parent,
3483 GstPadMode mode, gboolean active)
3486 GstBaseParse *parse;
3488 parse = GST_BASE_PARSE (parent);
3490 GST_DEBUG_OBJECT (parse, "sink %sactivate in %s mode",
3491 (active) ? "" : "de", gst_pad_mode_get_name (mode));
3493 if (!gst_base_parse_activate (parse, active))
3494 goto activate_failed;
3497 case GST_PAD_MODE_PULL:
3499 parse->priv->pending_events =
3500 g_list_prepend (parse->priv->pending_events,
3501 gst_event_new_segment (&parse->segment));
3504 result = gst_pad_stop_task (pad);
3512 parse->priv->pad_mode = active ? mode : GST_PAD_MODE_NONE;
3514 GST_DEBUG_OBJECT (parse, "sink activate return: %d", result);
3521 GST_DEBUG_OBJECT (parse, "activate failed");
3527 * gst_base_parse_set_duration:
3528 * @parse: #GstBaseParse.
3530 * @duration: duration value.
3531 * @interval: how often to update the duration estimate based on bitrate, or 0.
3533 * Sets the duration of the currently playing media. Subclass can use this
3534 * when it is able to determine duration and/or notices a change in the media
3535 * duration. Alternatively, if @interval is non-zero (default), then stream
3536 * duration is determined based on estimated bitrate, and updated every @interval
3540 gst_base_parse_set_duration (GstBaseParse * parse,
3541 GstFormat fmt, gint64 duration, gint interval)
3543 g_return_if_fail (parse != NULL);
3545 if (parse->priv->upstream_has_duration) {
3546 GST_DEBUG_OBJECT (parse, "using upstream duration; discarding update");
3550 if (duration != parse->priv->duration) {
3553 m = gst_message_new_duration_changed (GST_OBJECT (parse));
3554 gst_element_post_message (GST_ELEMENT (parse), m);
3556 /* TODO: what about duration tag? */
3558 parse->priv->duration = duration;
3559 parse->priv->duration_fmt = fmt;
3560 GST_DEBUG_OBJECT (parse, "set duration: %" G_GINT64_FORMAT, duration);
3561 if (fmt == GST_FORMAT_TIME && GST_CLOCK_TIME_IS_VALID (duration)) {
3562 if (interval != 0) {
3563 GST_DEBUG_OBJECT (parse, "valid duration provided, disabling estimate");
3567 GST_DEBUG_OBJECT (parse, "set update interval: %d", interval);
3568 parse->priv->update_interval = interval;
3574 * gst_base_parse_set_average_bitrate:
3575 * @parse: #GstBaseParse.
3576 * @bitrate: average bitrate in bits/second
3578 * Optionally sets the average bitrate detected in media (if non-zero),
3579 * e.g. based on metadata, as it will be posted to the application.
3581 * By default, announced average bitrate is estimated. The average bitrate
3582 * is used to estimate the total duration of the stream and to estimate
3583 * a seek position, if there's no index and the format is syncable
3584 * (see gst_base_parse_set_syncable()).
3587 gst_base_parse_set_average_bitrate (GstBaseParse * parse, guint bitrate)
3589 parse->priv->bitrate = bitrate;
3590 GST_DEBUG_OBJECT (parse, "bitrate %u", bitrate);
3594 * gst_base_parse_set_min_frame_size:
3595 * @parse: #GstBaseParse.
3596 * @min_size: Minimum size of the data that this base class should give to
3599 * Subclass can use this function to tell the base class that it needs to
3600 * give at least #min_size buffers.
3603 gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
3605 g_return_if_fail (parse != NULL);
3607 parse->priv->min_frame_size = min_size;
3608 GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
3612 * gst_base_parse_set_frame_rate:
3613 * @parse: the #GstBaseParse to set
3614 * @fps_num: frames per second (numerator).
3615 * @fps_den: frames per second (denominator).
3616 * @lead_in: frames needed before a segment for subsequent decode
3617 * @lead_out: frames needed after a segment
3619 * If frames per second is configured, parser can take care of buffer duration
3620 * and timestamping. When performing segment clipping, or seeking to a specific
3621 * location, a corresponding decoder might need an initial @lead_in and a
3622 * following @lead_out number of frames to ensure the desired segment is
3623 * entirely filled upon decoding.
3626 gst_base_parse_set_frame_rate (GstBaseParse * parse, guint fps_num,
3627 guint fps_den, guint lead_in, guint lead_out)
3629 g_return_if_fail (parse != NULL);
3631 parse->priv->fps_num = fps_num;
3632 parse->priv->fps_den = fps_den;
3633 if (!fps_num || !fps_den) {
3634 GST_DEBUG_OBJECT (parse, "invalid fps (%d/%d), ignoring parameters",
3636 fps_num = fps_den = 0;
3637 parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
3638 parse->priv->lead_in = parse->priv->lead_out = 0;
3639 parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
3641 parse->priv->frame_duration =
3642 gst_util_uint64_scale (GST_SECOND, fps_den, fps_num);
3643 parse->priv->lead_in = lead_in;
3644 parse->priv->lead_out = lead_out;
3645 parse->priv->lead_in_ts =
3646 gst_util_uint64_scale (GST_SECOND, fps_den * lead_in, fps_num);
3647 parse->priv->lead_out_ts =
3648 gst_util_uint64_scale (GST_SECOND, fps_den * lead_out, fps_num);
3649 /* aim for about 1.5s to estimate duration */
3650 if (parse->priv->update_interval < 0) {
3651 parse->priv->update_interval = fps_num * 3 / (fps_den * 2);
3652 GST_LOG_OBJECT (parse, "estimated update interval to %d frames",
3653 parse->priv->update_interval);
3656 GST_LOG_OBJECT (parse, "set fps: %d/%d => duration: %" G_GINT64_FORMAT " ms",
3657 fps_num, fps_den, parse->priv->frame_duration / GST_MSECOND);
3658 GST_LOG_OBJECT (parse, "set lead in: %d frames = %" G_GUINT64_FORMAT " ms, "
3659 "lead out: %d frames = %" G_GUINT64_FORMAT " ms",
3660 lead_in, parse->priv->lead_in_ts / GST_MSECOND,
3661 lead_out, parse->priv->lead_out_ts / GST_MSECOND);
3665 * gst_base_parse_set_has_timing_info:
3666 * @parse: a #GstBaseParse
3667 * @has_timing: whether frames carry timing information
3669 * Set if frames carry timing information which the subclass can (generally)
3670 * parse and provide. In particular, intrinsic (rather than estimated) time
3671 * can be obtained following a seek.
3674 gst_base_parse_set_has_timing_info (GstBaseParse * parse, gboolean has_timing)
3676 parse->priv->has_timing_info = has_timing;
3677 GST_INFO_OBJECT (parse, "has_timing: %s", (has_timing) ? "yes" : "no");
3681 * gst_base_parse_set_syncable:
3682 * @parse: a #GstBaseParse
3683 * @syncable: set if frame starts can be identified
3685 * Set if frame starts can be identified. This is set by default and
3686 * determines whether seeking based on bitrate averages
3687 * is possible for a format/stream.
3690 gst_base_parse_set_syncable (GstBaseParse * parse, gboolean syncable)
3692 parse->priv->syncable = syncable;
3693 GST_INFO_OBJECT (parse, "syncable: %s", (syncable) ? "yes" : "no");
3697 * gst_base_parse_set_passthrough:
3698 * @parse: a #GstBaseParse
3699 * @passthrough: %TRUE if parser should run in passthrough mode
3701 * Set if the nature of the format or configuration does not allow (much)
3702 * parsing, and the parser should operate in passthrough mode (which only
3703 * applies when operating in push mode). That is, incoming buffers are
3704 * pushed through unmodified, i.e. no @check_valid_frame or @parse_frame
3705 * callbacks will be invoked, but @pre_push_frame will still be invoked,
3706 * so subclass can perform as much or as little is appropriate for
3707 * passthrough semantics in @pre_push_frame.
3710 gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
3712 parse->priv->passthrough = passthrough;
3713 GST_INFO_OBJECT (parse, "passthrough: %s", (passthrough) ? "yes" : "no");
3717 * gst_base_parse_set_pts_interpolation:
3718 * @parse: a #GstBaseParse
3719 * @pts_interpolate: %TRUE if parser should interpolate PTS timestamps
3721 * By default, the base class will guess PTS timestamps using a simple
3722 * interpolation (previous timestamp + duration), which is incorrect for
3723 * data streams with reordering, where PTS can go backward. Sub-classes
3724 * implementing such formats should disable PTS interpolation.
3727 gst_base_parse_set_pts_interpolation (GstBaseParse * parse,
3728 gboolean pts_interpolate)
3730 parse->priv->pts_interpolate = pts_interpolate;
3731 GST_INFO_OBJECT (parse, "PTS interpolation: %s",
3732 (pts_interpolate) ? "yes" : "no");
3736 * gst_base_parse_set_infer_ts:
3737 * @parse: a #GstBaseParse
3738 * @infer_ts: %TRUE if parser should infer DTS/PTS from each other
3740 * By default, the base class might try to infer PTS from DTS and vice
3741 * versa. While this is generally correct for audio data, it may not
3742 * be otherwise. Sub-classes implementing such formats should disable
3743 * timestamp inferring.
3746 gst_base_parse_set_infer_ts (GstBaseParse * parse, gboolean infer_ts)
3748 parse->priv->infer_ts = infer_ts;
3749 GST_INFO_OBJECT (parse, "TS inferring: %s", (infer_ts) ? "yes" : "no");
3753 * gst_base_parse_set_latency:
3754 * @parse: a #GstBaseParse
3755 * @min_latency: minimum parse latency
3756 * @max_latency: maximum parse latency
3758 * Sets the minimum and maximum (which may likely be equal) latency introduced
3759 * by the parsing process. If there is such a latency, which depends on the
3760 * particular parsing of the format, it typically corresponds to 1 frame duration.
3763 gst_base_parse_set_latency (GstBaseParse * parse, GstClockTime min_latency,
3764 GstClockTime max_latency)
3766 g_return_if_fail (min_latency != GST_CLOCK_TIME_NONE);
3767 g_return_if_fail (min_latency <= max_latency);
3769 GST_OBJECT_LOCK (parse);
3770 parse->priv->min_latency = min_latency;
3771 parse->priv->max_latency = max_latency;
3772 GST_OBJECT_UNLOCK (parse);
3773 GST_INFO_OBJECT (parse, "min/max latency %" GST_TIME_FORMAT ", %"
3774 GST_TIME_FORMAT, GST_TIME_ARGS (min_latency),
3775 GST_TIME_ARGS (max_latency));
3779 gst_base_parse_get_duration (GstBaseParse * parse, GstFormat format,
3780 GstClockTime * duration)
3782 gboolean res = FALSE;
3784 g_return_val_if_fail (duration != NULL, FALSE);
3786 *duration = GST_CLOCK_TIME_NONE;
3787 if (parse->priv->duration != -1 && format == parse->priv->duration_fmt) {
3788 GST_LOG_OBJECT (parse, "using provided duration");
3789 *duration = parse->priv->duration;
3791 } else if (parse->priv->duration != -1) {
3792 GST_LOG_OBJECT (parse, "converting provided duration");
3793 res = gst_base_parse_convert (parse, parse->priv->duration_fmt,
3794 parse->priv->duration, format, (gint64 *) duration);
3795 } else if (format == GST_FORMAT_TIME && parse->priv->estimated_duration != -1) {
3796 GST_LOG_OBJECT (parse, "using estimated duration");
3797 *duration = parse->priv->estimated_duration;
3800 GST_LOG_OBJECT (parse, "cannot estimate duration");
3803 GST_LOG_OBJECT (parse, "res: %d, duration %" GST_TIME_FORMAT, res,
3804 GST_TIME_ARGS (*duration));
3809 gst_base_parse_src_query_default (GstBaseParse * parse, GstQuery * query)
3811 gboolean res = FALSE;
3814 pad = GST_BASE_PARSE_SRC_PAD (parse);
3816 switch (GST_QUERY_TYPE (query)) {
3817 case GST_QUERY_POSITION:
3822 GST_DEBUG_OBJECT (parse, "position query");
3823 gst_query_parse_position (query, &format, NULL);
3825 /* try upstream first */
3826 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
3828 /* Fall back on interpreting segment */
3829 GST_OBJECT_LOCK (parse);
3830 if (format == GST_FORMAT_BYTES) {
3831 dest_value = parse->priv->offset;
3833 } else if (format == parse->segment.format &&
3834 GST_CLOCK_TIME_IS_VALID (parse->segment.position)) {
3835 dest_value = gst_segment_to_stream_time (&parse->segment,
3836 parse->segment.format, parse->segment.position);
3839 GST_OBJECT_UNLOCK (parse);
3841 /* no precise result, upstream no idea either, then best estimate */
3842 /* priv->offset is updated in both PUSH/PULL modes */
3843 res = gst_base_parse_convert (parse,
3844 GST_FORMAT_BYTES, parse->priv->offset, format, &dest_value);
3847 gst_query_set_position (query, format, dest_value);
3851 case GST_QUERY_DURATION:
3854 GstClockTime duration;
3856 GST_DEBUG_OBJECT (parse, "duration query");
3857 gst_query_parse_duration (query, &format, NULL);
3859 /* consult upstream */
3860 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
3862 /* otherwise best estimate from us */
3864 res = gst_base_parse_get_duration (parse, format, &duration);
3866 gst_query_set_duration (query, format, duration);
3870 case GST_QUERY_SEEKING:
3873 GstClockTime duration = GST_CLOCK_TIME_NONE;
3874 gboolean seekable = FALSE;
3876 GST_DEBUG_OBJECT (parse, "seeking query");
3877 gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
3879 /* consult upstream */
3880 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
3882 /* we may be able to help if in TIME */
3883 if (fmt == GST_FORMAT_TIME && gst_base_parse_is_seekable (parse)) {
3884 gst_query_parse_seeking (query, &fmt, &seekable, NULL, NULL);
3885 /* already OK if upstream takes care */
3886 GST_LOG_OBJECT (parse, "upstream handled %d, seekable %d",
3888 if (!(res && seekable)) {
3889 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &duration)
3890 || duration == -1) {
3891 /* seekable if we still have a chance to get duration later on */
3893 parse->priv->upstream_seekable && parse->priv->update_interval;
3895 seekable = parse->priv->upstream_seekable;
3896 GST_LOG_OBJECT (parse, "already determine upstream seekabled: %d",
3899 gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0, duration);
3905 case GST_QUERY_FORMATS:
3906 gst_query_set_formatsv (query, 3, fmtlist);
3909 case GST_QUERY_CONVERT:
3911 GstFormat src_format, dest_format;
3912 gint64 src_value, dest_value;
3914 gst_query_parse_convert (query, &src_format, &src_value,
3915 &dest_format, &dest_value);
3917 res = gst_base_parse_convert (parse, src_format, src_value,
3918 dest_format, &dest_value);
3920 gst_query_set_convert (query, src_format, src_value,
3921 dest_format, dest_value);
3925 case GST_QUERY_LATENCY:
3927 if ((res = gst_pad_peer_query (parse->sinkpad, query))) {
3929 GstClockTime min_latency, max_latency;
3931 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
3932 GST_DEBUG_OBJECT (parse, "Peer latency: live %d, min %"
3933 GST_TIME_FORMAT " max %" GST_TIME_FORMAT, live,
3934 GST_TIME_ARGS (min_latency), GST_TIME_ARGS (max_latency));
3936 GST_OBJECT_LOCK (parse);
3937 /* add our latency */
3938 min_latency += parse->priv->min_latency;
3939 if (max_latency == -1 || parse->priv->max_latency == -1)
3942 max_latency += parse->priv->max_latency;
3943 GST_OBJECT_UNLOCK (parse);
3945 gst_query_set_latency (query, live, min_latency, max_latency);
3949 case GST_QUERY_SEGMENT:
3954 format = parse->segment.format;
3957 gst_segment_to_stream_time (&parse->segment, format,
3958 parse->segment.start);
3959 if ((stop = parse->segment.stop) == -1)
3960 stop = parse->segment.duration;
3962 stop = gst_segment_to_stream_time (&parse->segment, format, stop);
3964 gst_query_set_segment (query, parse->segment.rate, format, start, stop);
3969 res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
3975 /* scans for a cluster start from @pos,
3976 * return GST_FLOW_OK and frame position/time in @pos/@time if found */
3977 static GstFlowReturn
3978 gst_base_parse_find_frame (GstBaseParse * parse, gint64 * pos,
3979 GstClockTime * time, GstClockTime * duration)
3981 GstBaseParseClass *klass;
3983 gboolean orig_drain, orig_discont;
3984 GstFlowReturn ret = GST_FLOW_OK;
3985 GstBuffer *buf = NULL;
3986 GstBaseParseFrame *sframe = NULL;
3988 g_return_val_if_fail (pos != NULL, GST_FLOW_ERROR);
3989 g_return_val_if_fail (time != NULL, GST_FLOW_ERROR);
3990 g_return_val_if_fail (duration != NULL, GST_FLOW_ERROR);
3992 klass = GST_BASE_PARSE_GET_CLASS (parse);
3994 *time = GST_CLOCK_TIME_NONE;
3995 *duration = GST_CLOCK_TIME_NONE;
3998 orig_offset = parse->priv->offset;
3999 orig_discont = parse->priv->discont;
4000 orig_drain = parse->priv->drain;
4002 GST_DEBUG_OBJECT (parse, "scanning for frame starting at %" G_GINT64_FORMAT
4003 " (%#" G_GINT64_MODIFIER "x)", *pos, *pos);
4005 /* jump elsewhere and locate next frame */
4006 parse->priv->offset = *pos;
4007 /* mark as scanning so frames don't get processed all the way */
4008 parse->priv->scanning = TRUE;
4009 ret = gst_base_parse_scan_frame (parse, klass);
4010 parse->priv->scanning = FALSE;
4011 /* retrieve frame found during scan */
4012 sframe = parse->priv->scanned_frame;
4013 parse->priv->scanned_frame = NULL;
4015 if (ret != GST_FLOW_OK || !sframe)
4018 /* get offset first, subclass parsing might dump other stuff in there */
4019 *pos = sframe->offset;
4020 buf = sframe->buffer;
4023 /* but it should provide proper time */
4024 *time = GST_BUFFER_TIMESTAMP (buf);
4025 *duration = GST_BUFFER_DURATION (buf);
4027 GST_LOG_OBJECT (parse,
4028 "frame with time %" GST_TIME_FORMAT " at offset %" G_GINT64_FORMAT,
4029 GST_TIME_ARGS (*time), *pos);
4033 gst_base_parse_frame_free (sframe);
4036 parse->priv->offset = orig_offset;
4037 parse->priv->discont = orig_discont;
4038 parse->priv->drain = orig_drain;
4043 /* bisect and scan through file for frame starting before @time,
4044 * returns OK and @time/@offset if found, NONE and/or error otherwise
4045 * If @time == G_MAXINT64, scan for duration ( == last frame) */
4046 static GstFlowReturn
4047 gst_base_parse_locate_time (GstBaseParse * parse, GstClockTime * _time,
4050 GstFlowReturn ret = GST_FLOW_OK;
4051 gint64 lpos, hpos, newpos;
4052 GstClockTime time, ltime, htime, newtime, dur;
4053 gboolean cont = TRUE;
4054 const GstClockTime tolerance = TARGET_DIFFERENCE;
4055 const guint chunk = 4 * 1024;
4057 g_return_val_if_fail (_time != NULL, GST_FLOW_ERROR);
4058 g_return_val_if_fail (_offset != NULL, GST_FLOW_ERROR);
4060 GST_DEBUG_OBJECT (parse, "Bisecting for time %" GST_TIME_FORMAT,
4061 GST_TIME_ARGS (*_time));
4063 /* TODO also make keyframe aware if useful some day */
4078 /* do not know at first */
4080 *_time = GST_CLOCK_TIME_NONE;
4082 /* need initial positions; start and end */
4083 lpos = parse->priv->first_frame_offset;
4084 ltime = parse->priv->first_frame_pts;
4085 /* try other one if no luck */
4086 if (!GST_CLOCK_TIME_IS_VALID (ltime))
4087 ltime = parse->priv->first_frame_dts;
4088 if (!gst_base_parse_get_duration (parse, GST_FORMAT_TIME, &htime)) {
4089 GST_DEBUG_OBJECT (parse, "Unknown time duration, cannot bisect");
4090 return GST_FLOW_ERROR;
4092 hpos = parse->priv->upstream_size;
4094 GST_DEBUG_OBJECT (parse,
4095 "Bisection initial bounds: bytes %" G_GINT64_FORMAT " %" G_GINT64_FORMAT
4096 ", times %" GST_TIME_FORMAT " %" GST_TIME_FORMAT, lpos, hpos,
4097 GST_TIME_ARGS (ltime), GST_TIME_ARGS (htime));
4099 /* check preconditions are satisfied;
4100 * start and end are needed, except for special case where we scan for
4101 * last frame to determine duration */
4102 if (parse->priv->pad_mode != GST_PAD_MODE_PULL || !hpos ||
4103 !GST_CLOCK_TIME_IS_VALID (ltime) ||
4104 (!GST_CLOCK_TIME_IS_VALID (htime) && time != G_MAXINT64)) {
4108 /* shortcut cases */
4111 } else if (time < ltime + tolerance) {
4115 } else if (time >= htime) {
4121 while (htime > ltime && cont) {
4122 GST_LOG_OBJECT (parse,
4123 "lpos: %" G_GUINT64_FORMAT ", ltime: %" GST_TIME_FORMAT, lpos,
4124 GST_TIME_ARGS (ltime));
4125 GST_LOG_OBJECT (parse,
4126 "hpos: %" G_GUINT64_FORMAT ", htime: %" GST_TIME_FORMAT, hpos,
4127 GST_TIME_ARGS (htime));
4128 if (G_UNLIKELY (time == G_MAXINT64)) {
4130 } else if (G_LIKELY (hpos > lpos)) {
4132 gst_util_uint64_scale (hpos - lpos, time - ltime, htime - ltime) +
4135 /* should mean lpos == hpos, since lpos <= hpos is invariant */
4137 /* we check this case once, but not forever, so break loop */
4142 newpos = CLAMP (newpos, lpos, hpos);
4143 GST_LOG_OBJECT (parse,
4144 "estimated _offset for %" GST_TIME_FORMAT ": %" G_GINT64_FORMAT,
4145 GST_TIME_ARGS (time), newpos);
4147 ret = gst_base_parse_find_frame (parse, &newpos, &newtime, &dur);
4148 if (ret == GST_FLOW_EOS) {
4149 /* heuristic HACK */
4150 hpos = MAX (lpos, hpos - chunk);
4152 } else if (ret != GST_FLOW_OK) {
4156 if (newtime == -1 || newpos == -1) {
4157 GST_DEBUG_OBJECT (parse, "subclass did not provide metadata; aborting");
4161 if (G_UNLIKELY (time == G_MAXINT64)) {
4164 if (GST_CLOCK_TIME_IS_VALID (dur))
4167 } else if (newtime > time) {
4169 hpos = (newpos >= hpos) ? MAX (lpos, hpos - chunk) : MAX (lpos, newpos);
4171 } else if (newtime + tolerance > time) {
4172 /* close enough undershoot */
4176 } else if (newtime < ltime) {
4177 /* so a position beyond lpos resulted in earlier time than ltime ... */
4178 GST_DEBUG_OBJECT (parse, "non-ascending time; aborting");
4181 /* undershoot too far */
4182 newpos += newpos == lpos ? chunk : 0;
4183 lpos = CLAMP (newpos, lpos, hpos);
4189 GST_LOG_OBJECT (parse, "return offset %" G_GINT64_FORMAT ", time %"
4190 GST_TIME_FORMAT, *_offset, GST_TIME_ARGS (*_time));
4195 gst_base_parse_find_offset (GstBaseParse * parse, GstClockTime time,
4196 gboolean before, GstClockTime * _ts)
4198 gint64 bytes = 0, ts = 0;
4199 GstIndexEntry *entry = NULL;
4201 if (time == GST_CLOCK_TIME_NONE) {
4207 GST_BASE_PARSE_INDEX_LOCK (parse);
4208 if (parse->priv->index) {
4209 /* Let's check if we have an index entry for that time */
4210 entry = gst_index_get_assoc_entry (parse->priv->index,
4211 parse->priv->index_id,
4212 before ? GST_INDEX_LOOKUP_BEFORE : GST_INDEX_LOOKUP_AFTER,
4213 GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT, GST_FORMAT_TIME, time);
4217 gst_index_entry_assoc_map (entry, GST_FORMAT_BYTES, &bytes);
4218 gst_index_entry_assoc_map (entry, GST_FORMAT_TIME, &ts);
4220 GST_DEBUG_OBJECT (parse, "found index entry for %" GST_TIME_FORMAT
4221 " at %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT,
4222 GST_TIME_ARGS (time), GST_TIME_ARGS (ts), bytes);
4224 GST_DEBUG_OBJECT (parse, "no index entry found for %" GST_TIME_FORMAT,
4225 GST_TIME_ARGS (time));
4228 ts = GST_CLOCK_TIME_NONE;
4231 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4240 /* returns TRUE if seek succeeded */
4242 gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
4247 GstSeekType start_type = GST_SEEK_TYPE_NONE, stop_type;
4248 gboolean flush, update, res = TRUE, accurate;
4249 gint64 start, stop, seekpos, seekstop;
4250 GstSegment seeksegment = { 0, };
4251 GstClockTime start_ts;
4253 GstEvent *segment_event;
4255 /* try upstream first, unless we're driving the streaming thread ourselves */
4256 if (parse->priv->pad_mode != GST_PAD_MODE_PULL) {
4257 res = gst_pad_push_event (parse->sinkpad, gst_event_ref (event));
4262 gst_event_parse_seek (event, &rate, &format, &flags,
4263 &start_type, &start, &stop_type, &stop);
4264 seqnum = gst_event_get_seqnum (event);
4266 GST_DEBUG_OBJECT (parse, "seek to format %s, rate %f, "
4267 "start type %d at %" GST_TIME_FORMAT ", end type %d at %"
4268 GST_TIME_FORMAT, gst_format_get_name (format), rate,
4269 start_type, GST_TIME_ARGS (start), stop_type, GST_TIME_ARGS (stop));
4271 /* we can only handle TIME, so check if subclass can convert
4272 * to TIME format if it's some other format (such as DEFAULT) */
4273 if (format != GST_FORMAT_TIME) {
4274 if (!gst_base_parse_convert (parse, format, start, GST_FORMAT_TIME, &start)
4275 || !gst_base_parse_convert (parse, format, stop, GST_FORMAT_TIME,
4277 goto no_convert_to_time;
4279 GST_INFO_OBJECT (parse, "converted %s format to start time "
4280 "%" GST_TIME_FORMAT " and stop time %" GST_TIME_FORMAT,
4281 gst_format_get_name (format), GST_TIME_ARGS (start),
4282 GST_TIME_ARGS (stop));
4284 format = GST_FORMAT_TIME;
4287 /* no negative rates in push mode (unless upstream takes care of that, but
4288 * we've already tried upstream and it didn't handle the seek request) */
4289 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PUSH)
4292 if (rate < 0.0 && parse->priv->pad_mode == GST_PAD_MODE_PULL)
4293 goto negative_rate_pull_mode;
4295 if (start_type != GST_SEEK_TYPE_SET ||
4296 (stop_type != GST_SEEK_TYPE_SET && stop_type != GST_SEEK_TYPE_NONE))
4299 /* get flush flag */
4300 flush = flags & GST_SEEK_FLAG_FLUSH;
4302 /* copy segment, we need this because we still need the old
4303 * segment when we close the current segment. */
4304 gst_segment_copy_into (&parse->segment, &seeksegment);
4306 GST_DEBUG_OBJECT (parse, "configuring seek");
4307 gst_segment_do_seek (&seeksegment, rate, format, flags,
4308 start_type, start, stop_type, stop, &update);
4310 /* accurate seeking implies seek tables are used to obtain position,
4311 * and the requested segment is maintained exactly, not adjusted any way */
4312 accurate = flags & GST_SEEK_FLAG_ACCURATE;
4314 /* maybe we can be accurate for (almost) free */
4315 gst_base_parse_find_offset (parse, seeksegment.position, TRUE, &start_ts);
4316 if (seeksegment.position <= start_ts + TARGET_DIFFERENCE) {
4317 GST_DEBUG_OBJECT (parse, "accurate seek possible");
4321 GstClockTime startpos = seeksegment.position;
4323 /* accurate requested, so ... seek a bit before target */
4324 if (startpos < parse->priv->lead_in_ts)
4327 startpos -= parse->priv->lead_in_ts;
4328 seekpos = gst_base_parse_find_offset (parse, startpos, TRUE, &start_ts);
4329 seekstop = gst_base_parse_find_offset (parse, seeksegment.stop, FALSE,
4332 start_ts = seeksegment.position;
4333 if (!gst_base_parse_convert (parse, format, seeksegment.position,
4334 GST_FORMAT_BYTES, &seekpos))
4335 goto convert_failed;
4336 if (!gst_base_parse_convert (parse, format, seeksegment.stop,
4337 GST_FORMAT_BYTES, &seekstop))
4338 goto convert_failed;
4341 GST_DEBUG_OBJECT (parse,
4342 "seek position %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
4344 GST_DEBUG_OBJECT (parse,
4345 "seek stop %" G_GINT64_FORMAT " in bytes: %" G_GINT64_FORMAT,
4346 seeksegment.stop, seekstop);
4348 if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
4351 GST_DEBUG_OBJECT (parse, "seek in PULL mode");
4354 if (parse->srcpad) {
4355 GstEvent *fevent = gst_event_new_flush_start ();
4356 GST_DEBUG_OBJECT (parse, "sending flush start");
4358 gst_event_set_seqnum (fevent, seqnum);
4360 gst_pad_push_event (parse->srcpad, gst_event_ref (fevent));
4361 /* unlock upstream pull_range */
4362 gst_pad_push_event (parse->sinkpad, fevent);
4365 gst_pad_pause_task (parse->sinkpad);
4368 /* we should now be able to grab the streaming thread because we stopped it
4369 * with the above flush/pause code */
4370 GST_PAD_STREAM_LOCK (parse->sinkpad);
4372 /* save current position */
4373 last_stop = parse->segment.position;
4374 GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
4377 /* now commit to new position */
4379 /* prepare for streaming again */
4381 GstEvent *fevent = gst_event_new_flush_stop (TRUE);
4382 GST_DEBUG_OBJECT (parse, "sending flush stop");
4383 gst_event_set_seqnum (fevent, seqnum);
4384 gst_pad_push_event (parse->srcpad, gst_event_ref (fevent));
4385 gst_pad_push_event (parse->sinkpad, fevent);
4386 gst_base_parse_clear_queues (parse);
4388 /* keep track of our position */
4389 seeksegment.base = gst_segment_to_running_time (&seeksegment,
4390 seeksegment.format, parse->segment.position);
4393 memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
4395 /* store the newsegment event so it can be sent from the streaming thread. */
4396 /* This will be sent later in _loop() */
4397 segment_event = gst_event_new_segment (&parse->segment);
4398 gst_event_set_seqnum (segment_event, seqnum);
4399 parse->priv->pending_events =
4400 g_list_prepend (parse->priv->pending_events, segment_event);
4402 GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
4403 "start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
4404 ", time = %" GST_TIME_FORMAT, format,
4405 GST_TIME_ARGS (parse->segment.start),
4406 GST_TIME_ARGS (parse->segment.stop),
4407 GST_TIME_ARGS (parse->segment.time));
4409 /* one last chance in pull mode to stay accurate;
4410 * maybe scan and subclass can find where to go */
4413 GstClockTime ts = seeksegment.position;
4415 gst_base_parse_locate_time (parse, &ts, &scanpos);
4419 /* running collected index now consists of several intervals,
4420 * so optimized check no longer possible */
4421 parse->priv->index_last_valid = FALSE;
4422 parse->priv->index_last_offset = 0;
4423 parse->priv->index_last_ts = 0;
4427 /* mark discont if we are going to stream from another position. */
4428 if (seekpos != parse->priv->offset) {
4429 GST_DEBUG_OBJECT (parse,
4430 "mark DISCONT, we did a seek to another position");
4431 parse->priv->offset = seekpos;
4432 parse->priv->last_offset = seekpos;
4433 parse->priv->seen_keyframe = FALSE;
4434 parse->priv->discont = TRUE;
4435 parse->priv->next_dts = start_ts;
4436 parse->priv->next_pts = GST_CLOCK_TIME_NONE;
4437 parse->priv->last_dts = GST_CLOCK_TIME_NONE;
4438 parse->priv->last_pts = GST_CLOCK_TIME_NONE;
4439 parse->priv->sync_offset = seekpos;
4440 parse->priv->exact_position = accurate;
4443 /* Start streaming thread if paused */
4444 gst_pad_start_task (parse->sinkpad,
4445 (GstTaskFunction) gst_base_parse_loop, parse->sinkpad, NULL);
4447 GST_PAD_STREAM_UNLOCK (parse->sinkpad);
4452 GstEvent *new_event;
4453 GstBaseParseSeek *seek;
4454 GstSeekFlags flags = (flush ? GST_SEEK_FLAG_FLUSH : GST_SEEK_FLAG_NONE);
4456 /* The only thing we need to do in PUSH-mode is to send the
4457 seek event (in bytes) to upstream. Segment / flush handling happens
4458 in corresponding src event handlers */
4459 GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
4460 if (seekstop >= 0 && seekstop <= seekpos)
4462 new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
4463 GST_SEEK_TYPE_SET, seekpos, stop_type, seekstop);
4464 gst_event_set_seqnum (new_event, seqnum);
4466 /* store segment info so its precise details can be reconstructed when
4467 * receiving newsegment;
4468 * this matters for all details when accurate seeking,
4469 * is most useful to preserve NONE stop time otherwise */
4470 seek = g_new0 (GstBaseParseSeek, 1);
4471 seek->segment = seeksegment;
4472 seek->accurate = accurate;
4473 seek->offset = seekpos;
4474 seek->start_ts = start_ts;
4475 GST_OBJECT_LOCK (parse);
4476 /* less optimal, but preserves order */
4477 parse->priv->pending_seeks =
4478 g_slist_append (parse->priv->pending_seeks, seek);
4479 GST_OBJECT_UNLOCK (parse);
4481 res = gst_pad_push_event (parse->sinkpad, new_event);
4484 GST_OBJECT_LOCK (parse);
4485 parse->priv->pending_seeks =
4486 g_slist_remove (parse->priv->pending_seeks, seek);
4487 GST_OBJECT_UNLOCK (parse);
4493 gst_event_unref (event);
4497 negative_rate_pull_mode:
4499 GST_FIXME_OBJECT (parse, "negative playback in pull mode needs fixing");
4505 GST_DEBUG_OBJECT (parse, "negative playback rates delegated upstream.");
4511 GST_DEBUG_OBJECT (parse, "unsupported seek type.");
4517 GST_DEBUG_OBJECT (parse, "seek in %s format was requested, but subclass "
4518 "couldn't convert that into TIME format", gst_format_get_name (format));
4524 GST_DEBUG_OBJECT (parse, "conversion TIME to BYTES failed.");
4530 /* Checks if bitrates are available from upstream tags so that we don't
4531 * override them later
4534 gst_base_parse_handle_tag (GstBaseParse * parse, GstEvent * event)
4536 GstTagList *taglist = NULL;
4539 gst_event_parse_tag (event, &taglist);
4541 /* We only care about stream tags here */
4542 if (gst_tag_list_get_scope (taglist) != GST_TAG_SCOPE_STREAM)
4545 if (gst_tag_list_get_uint (taglist, GST_TAG_MINIMUM_BITRATE, &tmp)) {
4546 GST_DEBUG_OBJECT (parse, "upstream min bitrate %d", tmp);
4547 parse->priv->post_min_bitrate = FALSE;
4549 if (gst_tag_list_get_uint (taglist, GST_TAG_BITRATE, &tmp)) {
4550 GST_DEBUG_OBJECT (parse, "upstream avg bitrate %d", tmp);
4551 parse->priv->post_avg_bitrate = FALSE;
4553 if (gst_tag_list_get_uint (taglist, GST_TAG_MAXIMUM_BITRATE, &tmp)) {
4554 GST_DEBUG_OBJECT (parse, "upstream max bitrate %d", tmp);
4555 parse->priv->post_max_bitrate = FALSE;
4561 gst_base_parse_set_index (GstElement * element, GstIndex * index)
4563 GstBaseParse *parse = GST_BASE_PARSE (element);
4565 GST_BASE_PARSE_INDEX_LOCK (parse);
4566 if (parse->priv->index)
4567 gst_object_unref (parse->priv->index);
4569 parse->priv->index = gst_object_ref (index);
4570 gst_index_get_writer_id (index, GST_OBJECT_CAST (element),
4571 &parse->priv->index_id);
4572 parse->priv->own_index = FALSE;
4574 parse->priv->index = NULL;
4576 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4580 gst_base_parse_get_index (GstElement * element)
4582 GstBaseParse *parse = GST_BASE_PARSE (element);
4583 GstIndex *result = NULL;
4585 GST_BASE_PARSE_INDEX_LOCK (parse);
4586 if (parse->priv->index)
4587 result = gst_object_ref (parse->priv->index);
4588 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4594 static GstStateChangeReturn
4595 gst_base_parse_change_state (GstElement * element, GstStateChange transition)
4597 GstBaseParse *parse;
4598 GstStateChangeReturn result;
4600 parse = GST_BASE_PARSE (element);
4602 switch (transition) {
4603 case GST_STATE_CHANGE_READY_TO_PAUSED:
4604 /* If this is our own index destroy it as the
4605 * old entries might be wrong for the new stream */
4606 GST_BASE_PARSE_INDEX_LOCK (parse);
4607 if (parse->priv->own_index) {
4608 gst_object_unref (parse->priv->index);
4609 parse->priv->index = NULL;
4610 parse->priv->own_index = FALSE;
4613 /* If no index was created, generate one */
4614 if (G_UNLIKELY (!parse->priv->index)) {
4615 GST_DEBUG_OBJECT (parse, "no index provided creating our own");
4617 parse->priv->index = g_object_new (gst_mem_index_get_type (), NULL);
4618 gst_index_get_writer_id (parse->priv->index, GST_OBJECT (parse),
4619 &parse->priv->index_id);
4620 parse->priv->own_index = TRUE;
4622 GST_BASE_PARSE_INDEX_UNLOCK (parse);
4628 result = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4630 switch (transition) {
4631 case GST_STATE_CHANGE_PAUSED_TO_READY:
4632 gst_base_parse_reset (parse);
4642 * gst_base_parse_set_ts_at_offset:
4643 * @parse: a #GstBaseParse
4644 * @offset: offset into current buffer
4646 * This function should only be called from a @handle_frame implementation.
4648 * #GstBaseParse creates initial timestamps for frames by using the last
4649 * timestamp seen in the stream before the frame starts. In certain
4650 * cases, the correct timestamps will occur in the stream after the
4651 * start of the frame, but before the start of the actual picture data.
4652 * This function can be used to set the timestamps based on the offset
4653 * into the frame data that the picture starts.
4658 gst_base_parse_set_ts_at_offset (GstBaseParse * parse, gsize offset)
4660 GstClockTime pts, dts;
4662 g_return_if_fail (GST_IS_BASE_PARSE (parse));
4664 pts = gst_adapter_prev_pts_at_offset (parse->priv->adapter, offset, NULL);
4665 dts = gst_adapter_prev_dts_at_offset (parse->priv->adapter, offset, NULL);
4667 if (!GST_CLOCK_TIME_IS_VALID (pts) || !GST_CLOCK_TIME_IS_VALID (dts)) {
4668 GST_DEBUG_OBJECT (parse,
4669 "offset adapter timestamps dts=%" GST_TIME_FORMAT " pts=%"
4670 GST_TIME_FORMAT, GST_TIME_ARGS (dts), GST_TIME_ARGS (pts));
4672 if (GST_CLOCK_TIME_IS_VALID (pts) && (parse->priv->prev_pts != pts))
4673 parse->priv->prev_pts = parse->priv->next_pts = pts;
4675 if (GST_CLOCK_TIME_IS_VALID (dts) && (parse->priv->prev_dts != dts))
4676 parse->priv->prev_dts = parse->priv->next_dts = dts;