2 * Copyright (C) 2005-2007 Wim Taymans <wim.taymans@gmail.com>
4 * gstbasesink.c: Base class for sink elements
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
24 * @short_description: Base class for sink elements
25 * @see_also: #GstBaseTransform, #GstBaseSrc
27 * #GstBaseSink is the base class for sink elements in GStreamer, such as
28 * xvimagesink or filesink. It is a layer on top of #GstElement that provides a
29 * simplified interface to plugin writers. #GstBaseSink handles many details
30 * for you, for example: preroll, clock synchronization, state changes,
31 * activation in push or pull mode, and queries.
33 * In most cases, when writing sink elements, there is no need to implement
34 * class methods from #GstElement or to set functions on pads, because the
35 * #GstBaseSink infrastructure should be sufficient.
37 * #GstBaseSink provides support for exactly one sink pad, which should be
38 * named "sink". A sink implementation (subclass of #GstBaseSink) should
39 * install a pad template in its base_init function, like so:
42 * my_element_base_init (gpointer g_class)
44 * GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class);
46 * // sinktemplate should be a #GstStaticPadTemplate with direction
47 * // #GST_PAD_SINK and name "sink"
48 * gst_element_class_add_pad_template (gstelement_class,
49 * gst_static_pad_template_get (&sinktemplate));
50 * // see #GstElementDetails
51 * gst_element_class_set_details (gstelement_class, &details);
55 * #GstBaseSink will handle the prerolling correctly. This means that it will
56 * return #GST_STATE_CHANGE_ASYNC from a state change to PAUSED until the first
57 * buffer arrives in this element. The base class will call the
58 * #GstBaseSinkClass.preroll() vmethod with this preroll buffer and will then
59 * commit the state change to the next asynchronously pending state.
61 * When the element is set to PLAYING, #GstBaseSink will synchronise on the
62 * clock using the times returned from #GstBaseSinkClass.get_times(). If this
63 * function returns #GST_CLOCK_TIME_NONE for the start time, no synchronisation
64 * will be done. Synchronisation can be disabled entirely by setting the object
65 * #GstBaseSink:sync property to %FALSE.
67 * After synchronisation the virtual method #GstBaseSinkClass.render() will be
68 * called. Subclasses should minimally implement this method.
70 * Since 0.10.3 subclasses that synchronise on the clock in the
71 * #GstBaseSinkClass.render() method are supported as well. These classes
72 * typically receive a buffer in the render method and can then potentially
73 * block on the clock while rendering. A typical example is an audiosink.
74 * Since 0.10.11 these subclasses can use gst_base_sink_wait_preroll() to
75 * perform the blocking wait.
77 * Upon receiving the EOS event in the PLAYING state, #GstBaseSink will wait
78 * for the clock to reach the time indicated by the stop time of the last
79 * #GstBaseSinkClass.get_times() call before posting an EOS message. When the
80 * element receives EOS in PAUSED, preroll completes, the event is queued and an
81 * EOS message is posted when going to PLAYING.
83 * #GstBaseSink will internally use the #GST_EVENT_NEWSEGMENT events to schedule
84 * synchronisation and clipping of buffers. Buffers that fall completely outside
85 * of the current segment are dropped. Buffers that fall partially in the
86 * segment are rendered (and prerolled). Subclasses should do any subbuffer
87 * clipping themselves when needed.
89 * #GstBaseSink will by default report the current playback position in
90 * #GST_FORMAT_TIME based on the current clock time and segment information.
91 * If no clock has been set on the element, the query will be forwarded
94 * The #GstBaseSinkClass.set_caps() function will be called when the subclass
95 * should configure itself to process a specific media type.
97 * The #GstBaseSinkClass.start() and #GstBaseSinkClass.stop() virtual methods
98 * will be called when resources should be allocated. Any
99 * #GstBaseSinkClass.preroll(), #GstBaseSinkClass.render() and
100 * #GstBaseSinkClass.set_caps() function will be called between the
101 * #GstBaseSinkClass.start() and #GstBaseSinkClass.stop() calls.
103 * The #GstBaseSinkClass.event() virtual method will be called when an event is
104 * received by #GstBaseSink. Normally this method should only be overriden by
105 * very specific elements (such as file sinks) which need to handle the
106 * newsegment event specially.
108 * #GstBaseSink provides an overridable #GstBaseSinkClass.buffer_alloc()
109 * function that can be used by sinks that want to do reverse negotiation or to
110 * provide custom buffers (hardware buffers for example) to upstream elements.
112 * The #GstBaseSinkClass.unlock() method is called when the elements should
113 * unblock any blocking operations they perform in the
114 * #GstBaseSinkClass.render() method. This is mostly useful when the
115 * #GstBaseSinkClass.render() method performs a blocking write on a file
116 * descriptor, for example.
118 * The #GstBaseSink:max-lateness property affects how the sink deals with
119 * buffers that arrive too late in the sink. A buffer arrives too late in the
120 * sink when the presentation time (as a combination of the last segment, buffer
121 * timestamp and element base_time) plus the duration is before the current
123 * If the frame is later than max-lateness, the sink will drop the buffer
124 * without calling the render method.
125 * This feature is disabled if sync is disabled, the
126 * #GstBaseSinkClass.get_times() method does not return a valid start time or
127 * max-lateness is set to -1 (the default).
128 * Subclasses can use gst_base_sink_set_max_lateness() to configure the
129 * max-lateness value.
131 * The #GstBaseSink:qos property will enable the quality-of-service features of
132 * the basesink which gather statistics about the real-time performance of the
133 * clock synchronisation. For each buffer received in the sink, statistics are
134 * gathered and a QOS event is sent upstream with these numbers. This
135 * information can then be used by upstream elements to reduce their processing
138 * Since 0.10.15 the #GstBaseSink:async property can be used to instruct the
139 * sink to never perform an ASYNC state change. This feature is mostly usable
140 * when dealing with non-synchronized streams or sparse streams.
142 * Last reviewed on 2007-08-29 (0.10.15)
149 #include <gst/gst_private.h>
151 #include "gstbasesink.h"
152 #include <gst/gstmarshal.h>
153 #include <gst/gst-i18n-lib.h>
155 GST_DEBUG_CATEGORY_STATIC (gst_base_sink_debug);
156 #define GST_CAT_DEFAULT gst_base_sink_debug
158 #define GST_BASE_SINK_GET_PRIVATE(obj) \
159 (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_SINK, GstBaseSinkPrivate))
161 #define GST_FLOW_STEP GST_FLOW_CUSTOM_ERROR
165 gboolean valid; /* if this info is valid */
166 guint32 seqnum; /* the seqnum of the STEP event */
167 GstFormat format; /* the format of the amount */
168 guint64 amount; /* the total amount of data to skip */
169 guint64 position; /* the position in the stepped data */
170 guint64 duration; /* the duration in time of the skipped data */
171 guint64 start; /* running_time of the start */
172 gdouble rate; /* rate of skipping */
173 gdouble start_rate; /* rate before skipping */
174 guint64 start_start; /* start position skipping */
175 guint64 start_stop; /* stop position skipping */
176 gboolean flush; /* if this was a flushing step */
177 gboolean intermediate; /* if this is an intermediate step */
178 gboolean need_preroll; /* if we need preroll after this step */
181 /* FIXME, some stuff in ABI.data and other in Private...
182 * Make up your mind please.
184 struct _GstBaseSinkPrivate
186 gint qos_enabled; /* ATOMIC */
187 gboolean async_enabled;
188 GstClockTimeDiff ts_offset;
189 GstClockTime render_delay;
191 /* start, stop of current buffer, stream time, used to report position */
192 GstClockTime current_sstart;
193 GstClockTime current_sstop;
195 /* start, stop and jitter of current buffer, running time */
196 GstClockTime current_rstart;
197 GstClockTime current_rstop;
198 GstClockTimeDiff current_jitter;
200 /* EOS sync time in running time */
201 GstClockTime eos_rtime;
203 /* last buffer that arrived in time, running time */
204 GstClockTime last_in_time;
205 /* when the last buffer left the sink, running time */
206 GstClockTime last_left;
208 /* running averages go here these are done on running time */
210 GstClockTime avg_duration;
213 /* these are done on system time. avg_jitter and avg_render are
214 * compared to eachother to see if the rendering time takes a
215 * huge amount of the processing, If so we are flooded with
217 GstClockTime last_left_systime;
218 GstClockTime avg_jitter;
219 GstClockTime start, stop;
220 GstClockTime avg_render;
222 /* number of rendered and dropped frames */
227 GstClockTime latency;
229 /* if we already commited the state */
232 /* when we received EOS */
233 gboolean received_eos;
235 /* when we are prerolled and able to report latency */
236 gboolean have_latency;
238 /* the last buffer we prerolled or rendered. Useful for making snapshots */
239 GstBuffer *last_buffer;
241 /* caps for pull based scheduling */
244 /* blocksize for pulling */
249 /* seqnum of the stream */
252 gboolean call_preroll;
253 gboolean step_unlock;
255 /* we have a pending and a current step operation */
256 GstStepInfo current_step;
257 GstStepInfo pending_step;
260 #define DO_RUNNING_AVG(avg,val,size) (((val) + ((size)-1) * (avg)) / (size))
262 /* generic running average, this has a neutral window size */
263 #define UPDATE_RUNNING_AVG(avg,val) DO_RUNNING_AVG(avg,val,8)
265 /* the windows for these running averages are experimentally obtained.
266 * possitive values get averaged more while negative values use a small
267 * window so we can react faster to badness. */
268 #define UPDATE_RUNNING_AVG_P(avg,val) DO_RUNNING_AVG(avg,val,16)
269 #define UPDATE_RUNNING_AVG_N(avg,val) DO_RUNNING_AVG(avg,val,4)
271 /* BaseSink properties */
273 #define DEFAULT_CAN_ACTIVATE_PULL FALSE /* fixme: enable me */
274 #define DEFAULT_CAN_ACTIVATE_PUSH TRUE
276 #define DEFAULT_PREROLL_QUEUE_LEN 0
277 #define DEFAULT_SYNC TRUE
278 #define DEFAULT_MAX_LATENESS -1
279 #define DEFAULT_QOS FALSE
280 #define DEFAULT_ASYNC TRUE
281 #define DEFAULT_TS_OFFSET 0
282 #define DEFAULT_BLOCKSIZE 4096
283 #define DEFAULT_RENDER_DELAY 0
288 PROP_PREROLL_QUEUE_LEN,
300 static GstElementClass *parent_class = NULL;
302 static void gst_base_sink_class_init (GstBaseSinkClass * klass);
303 static void gst_base_sink_init (GstBaseSink * trans, gpointer g_class);
304 static void gst_base_sink_finalize (GObject * object);
307 gst_base_sink_get_type (void)
309 static volatile gsize base_sink_type = 0;
311 if (g_once_init_enter (&base_sink_type)) {
313 static const GTypeInfo base_sink_info = {
314 sizeof (GstBaseSinkClass),
317 (GClassInitFunc) gst_base_sink_class_init,
320 sizeof (GstBaseSink),
322 (GInstanceInitFunc) gst_base_sink_init,
325 _type = g_type_register_static (GST_TYPE_ELEMENT,
326 "GstBaseSink", &base_sink_info, G_TYPE_FLAG_ABSTRACT);
327 g_once_init_leave (&base_sink_type, _type);
329 return base_sink_type;
332 static void gst_base_sink_set_property (GObject * object, guint prop_id,
333 const GValue * value, GParamSpec * pspec);
334 static void gst_base_sink_get_property (GObject * object, guint prop_id,
335 GValue * value, GParamSpec * pspec);
337 static gboolean gst_base_sink_send_event (GstElement * element,
339 static gboolean gst_base_sink_query (GstElement * element, GstQuery * query);
341 static GstCaps *gst_base_sink_get_caps (GstBaseSink * sink);
342 static gboolean gst_base_sink_set_caps (GstBaseSink * sink, GstCaps * caps);
343 static GstFlowReturn gst_base_sink_buffer_alloc (GstBaseSink * sink,
344 guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
345 static void gst_base_sink_get_times (GstBaseSink * basesink, GstBuffer * buffer,
346 GstClockTime * start, GstClockTime * end);
347 static gboolean gst_base_sink_set_flushing (GstBaseSink * basesink,
348 GstPad * pad, gboolean flushing);
349 static gboolean gst_base_sink_default_activate_pull (GstBaseSink * basesink,
351 static gboolean gst_base_sink_default_do_seek (GstBaseSink * sink,
352 GstSegment * segment);
353 static gboolean gst_base_sink_default_prepare_seek_segment (GstBaseSink * sink,
354 GstEvent * event, GstSegment * segment);
356 static GstStateChangeReturn gst_base_sink_change_state (GstElement * element,
357 GstStateChange transition);
359 static GstFlowReturn gst_base_sink_chain (GstPad * pad, GstBuffer * buffer);
360 static GstFlowReturn gst_base_sink_chain_list (GstPad * pad,
361 GstBufferList * list);
363 static void gst_base_sink_loop (GstPad * pad);
364 static gboolean gst_base_sink_pad_activate (GstPad * pad);
365 static gboolean gst_base_sink_pad_activate_push (GstPad * pad, gboolean active);
366 static gboolean gst_base_sink_pad_activate_pull (GstPad * pad, gboolean active);
367 static gboolean gst_base_sink_event (GstPad * pad, GstEvent * event);
369 static gboolean gst_base_sink_negotiate_pull (GstBaseSink * basesink);
370 static GstCaps *gst_base_sink_pad_getcaps (GstPad * pad);
371 static gboolean gst_base_sink_pad_setcaps (GstPad * pad, GstCaps * caps);
372 static void gst_base_sink_pad_fixate (GstPad * pad, GstCaps * caps);
373 static GstFlowReturn gst_base_sink_pad_buffer_alloc (GstPad * pad,
374 guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
377 /* check if an object was too late */
378 static gboolean gst_base_sink_is_too_late (GstBaseSink * basesink,
379 GstMiniObject * obj, GstClockTime start, GstClockTime stop,
380 GstClockReturn status, GstClockTimeDiff jitter);
381 static GstFlowReturn gst_base_sink_preroll_object (GstBaseSink * basesink,
382 gboolean is_list, GstMiniObject * obj);
385 gst_base_sink_class_init (GstBaseSinkClass * klass)
387 GObjectClass *gobject_class;
388 GstElementClass *gstelement_class;
390 gobject_class = G_OBJECT_CLASS (klass);
391 gstelement_class = GST_ELEMENT_CLASS (klass);
393 GST_DEBUG_CATEGORY_INIT (gst_base_sink_debug, "basesink", 0,
396 g_type_class_add_private (klass, sizeof (GstBaseSinkPrivate));
398 parent_class = g_type_class_peek_parent (klass);
400 gobject_class->finalize = gst_base_sink_finalize;
401 gobject_class->set_property = gst_base_sink_set_property;
402 gobject_class->get_property = gst_base_sink_get_property;
404 /* FIXME, this next value should be configured using an event from the
405 * upstream element, ie, the BUFFER_SIZE event. */
406 g_object_class_install_property (gobject_class, PROP_PREROLL_QUEUE_LEN,
407 g_param_spec_uint ("preroll-queue-len", "Preroll queue length",
408 "Number of buffers to queue during preroll", 0, G_MAXUINT,
409 DEFAULT_PREROLL_QUEUE_LEN,
410 G_PARAM_READWRITE | G_PARAM_CONSTRUCT | G_PARAM_STATIC_STRINGS));
412 g_object_class_install_property (gobject_class, PROP_SYNC,
413 g_param_spec_boolean ("sync", "Sync", "Sync on the clock", DEFAULT_SYNC,
414 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
416 g_object_class_install_property (gobject_class, PROP_MAX_LATENESS,
417 g_param_spec_int64 ("max-lateness", "Max Lateness",
418 "Maximum number of nanoseconds that a buffer can be late before it "
419 "is dropped (-1 unlimited)", -1, G_MAXINT64, DEFAULT_MAX_LATENESS,
420 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
422 g_object_class_install_property (gobject_class, PROP_QOS,
423 g_param_spec_boolean ("qos", "Qos",
424 "Generate Quality-of-Service events upstream", DEFAULT_QOS,
425 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
429 * If set to #TRUE, the basesink will perform asynchronous state changes.
430 * When set to #FALSE, the sink will not signal the parent when it prerolls.
431 * Use this option when dealing with sparse streams or when synchronisation is
436 g_object_class_install_property (gobject_class, PROP_ASYNC,
437 g_param_spec_boolean ("async", "Async",
438 "Go asynchronously to PAUSED", DEFAULT_ASYNC,
439 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
441 * GstBaseSink:ts-offset
443 * Controls the final synchronisation, a negative value will render the buffer
444 * earlier while a positive value delays playback. This property can be
445 * used to fix synchronisation in bad files.
449 g_object_class_install_property (gobject_class, PROP_TS_OFFSET,
450 g_param_spec_int64 ("ts-offset", "TS Offset",
451 "Timestamp offset in nanoseconds", G_MININT64, G_MAXINT64,
452 DEFAULT_TS_OFFSET, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
454 * GstBaseSink:last-buffer
456 * The last buffer that arrived in the sink and was used for preroll or for
457 * rendering. This property can be used to generate thumbnails. This property
458 * can be NULL when the sink has not yet received a bufer.
462 g_object_class_install_property (gobject_class, PROP_LAST_BUFFER,
463 gst_param_spec_mini_object ("last-buffer", "Last Buffer",
464 "The last buffer received in the sink", GST_TYPE_BUFFER,
465 G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
467 * GstBaseSink:blocksize
469 * The amount of bytes to pull when operating in pull mode.
473 g_object_class_install_property (gobject_class, PROP_BLOCKSIZE,
474 g_param_spec_uint ("blocksize", "Block size",
475 "Size in bytes to pull per buffer (0 = default)", 0, G_MAXUINT,
476 DEFAULT_BLOCKSIZE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
478 * GstBaseSink:render-delay
480 * The additional delay between synchronisation and actual rendering of the
481 * media. This property will add additional latency to the device in order to
482 * make other sinks compensate for the delay.
486 g_object_class_install_property (gobject_class, PROP_RENDER_DELAY,
487 g_param_spec_uint64 ("render-delay", "Render Delay",
488 "Additional render delay of the sink in nanoseconds", 0, G_MAXUINT64,
489 DEFAULT_RENDER_DELAY, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
491 gstelement_class->change_state =
492 GST_DEBUG_FUNCPTR (gst_base_sink_change_state);
493 gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_base_sink_send_event);
494 gstelement_class->query = GST_DEBUG_FUNCPTR (gst_base_sink_query);
496 klass->get_caps = GST_DEBUG_FUNCPTR (gst_base_sink_get_caps);
497 klass->set_caps = GST_DEBUG_FUNCPTR (gst_base_sink_set_caps);
498 klass->buffer_alloc = GST_DEBUG_FUNCPTR (gst_base_sink_buffer_alloc);
499 klass->get_times = GST_DEBUG_FUNCPTR (gst_base_sink_get_times);
500 klass->activate_pull =
501 GST_DEBUG_FUNCPTR (gst_base_sink_default_activate_pull);
503 /* Registering debug symbols for function pointers */
504 GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_pad_getcaps);
505 GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_pad_setcaps);
506 GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_pad_fixate);
507 GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_pad_buffer_alloc);
508 GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_pad_activate);
509 GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_pad_activate_push);
510 GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_pad_activate_pull);
511 GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_event);
512 GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_chain);
513 GST_DEBUG_REGISTER_FUNCPTR (gst_base_sink_chain_list);
517 gst_base_sink_pad_getcaps (GstPad * pad)
519 GstBaseSinkClass *bclass;
521 GstCaps *caps = NULL;
523 bsink = GST_BASE_SINK (gst_pad_get_parent (pad));
524 bclass = GST_BASE_SINK_GET_CLASS (bsink);
526 if (bsink->pad_mode == GST_ACTIVATE_PULL) {
527 /* if we are operating in pull mode we only accept the negotiated caps */
528 GST_OBJECT_LOCK (pad);
529 if ((caps = GST_PAD_CAPS (pad)))
531 GST_OBJECT_UNLOCK (pad);
534 if (bclass->get_caps)
535 caps = bclass->get_caps (bsink);
538 GstPadTemplate *pad_template;
541 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass),
543 if (pad_template != NULL) {
544 caps = gst_caps_ref (gst_pad_template_get_caps (pad_template));
548 gst_object_unref (bsink);
554 gst_base_sink_pad_setcaps (GstPad * pad, GstCaps * caps)
556 GstBaseSinkClass *bclass;
560 bsink = GST_BASE_SINK (gst_pad_get_parent (pad));
561 bclass = GST_BASE_SINK_GET_CLASS (bsink);
563 if (res && bclass->set_caps)
564 res = bclass->set_caps (bsink, caps);
566 gst_object_unref (bsink);
572 gst_base_sink_pad_fixate (GstPad * pad, GstCaps * caps)
574 GstBaseSinkClass *bclass;
577 bsink = GST_BASE_SINK (gst_pad_get_parent (pad));
578 bclass = GST_BASE_SINK_GET_CLASS (bsink);
581 bclass->fixate (bsink, caps);
583 gst_object_unref (bsink);
587 gst_base_sink_pad_buffer_alloc (GstPad * pad, guint64 offset, guint size,
588 GstCaps * caps, GstBuffer ** buf)
590 GstBaseSinkClass *bclass;
592 GstFlowReturn result = GST_FLOW_OK;
594 bsink = GST_BASE_SINK (gst_pad_get_parent (pad));
595 bclass = GST_BASE_SINK_GET_CLASS (bsink);
597 if (bclass->buffer_alloc)
598 result = bclass->buffer_alloc (bsink, offset, size, caps, buf);
600 *buf = NULL; /* fallback in gstpad.c will allocate generic buffer */
602 gst_object_unref (bsink);
608 gst_base_sink_init (GstBaseSink * basesink, gpointer g_class)
610 GstPadTemplate *pad_template;
611 GstBaseSinkPrivate *priv;
613 basesink->priv = priv = GST_BASE_SINK_GET_PRIVATE (basesink);
616 gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "sink");
617 g_return_if_fail (pad_template != NULL);
619 basesink->sinkpad = gst_pad_new_from_template (pad_template, "sink");
621 gst_pad_set_getcaps_function (basesink->sinkpad, gst_base_sink_pad_getcaps);
622 gst_pad_set_setcaps_function (basesink->sinkpad, gst_base_sink_pad_setcaps);
623 gst_pad_set_fixatecaps_function (basesink->sinkpad, gst_base_sink_pad_fixate);
624 gst_pad_set_bufferalloc_function (basesink->sinkpad,
625 gst_base_sink_pad_buffer_alloc);
626 gst_pad_set_activate_function (basesink->sinkpad, gst_base_sink_pad_activate);
627 gst_pad_set_activatepush_function (basesink->sinkpad,
628 gst_base_sink_pad_activate_push);
629 gst_pad_set_activatepull_function (basesink->sinkpad,
630 gst_base_sink_pad_activate_pull);
631 gst_pad_set_event_function (basesink->sinkpad, gst_base_sink_event);
632 gst_pad_set_chain_function (basesink->sinkpad, gst_base_sink_chain);
633 gst_pad_set_chain_list_function (basesink->sinkpad, gst_base_sink_chain_list);
634 gst_element_add_pad (GST_ELEMENT_CAST (basesink), basesink->sinkpad);
636 basesink->pad_mode = GST_ACTIVATE_NONE;
637 basesink->preroll_queue = g_queue_new ();
638 basesink->abidata.ABI.clip_segment = gst_segment_new ();
639 priv->have_latency = FALSE;
641 basesink->can_activate_push = DEFAULT_CAN_ACTIVATE_PUSH;
642 basesink->can_activate_pull = DEFAULT_CAN_ACTIVATE_PULL;
644 basesink->sync = DEFAULT_SYNC;
645 basesink->abidata.ABI.max_lateness = DEFAULT_MAX_LATENESS;
646 g_atomic_int_set (&priv->qos_enabled, DEFAULT_QOS);
647 priv->async_enabled = DEFAULT_ASYNC;
648 priv->ts_offset = DEFAULT_TS_OFFSET;
649 priv->render_delay = DEFAULT_RENDER_DELAY;
650 priv->blocksize = DEFAULT_BLOCKSIZE;
652 GST_OBJECT_FLAG_SET (basesink, GST_ELEMENT_IS_SINK);
656 gst_base_sink_finalize (GObject * object)
658 GstBaseSink *basesink;
660 basesink = GST_BASE_SINK (object);
662 g_queue_free (basesink->preroll_queue);
663 gst_segment_free (basesink->abidata.ABI.clip_segment);
665 G_OBJECT_CLASS (parent_class)->finalize (object);
669 * gst_base_sink_set_sync:
671 * @sync: the new sync value.
673 * Configures @sink to synchronize on the clock or not. When
674 * @sync is FALSE, incomming samples will be played as fast as
675 * possible. If @sync is TRUE, the timestamps of the incomming
676 * buffers will be used to schedule the exact render time of its
682 gst_base_sink_set_sync (GstBaseSink * sink, gboolean sync)
684 g_return_if_fail (GST_IS_BASE_SINK (sink));
686 GST_OBJECT_LOCK (sink);
688 GST_OBJECT_UNLOCK (sink);
692 * gst_base_sink_get_sync:
695 * Checks if @sink is currently configured to synchronize against the
698 * Returns: TRUE if the sink is configured to synchronize against the clock.
703 gst_base_sink_get_sync (GstBaseSink * sink)
707 g_return_val_if_fail (GST_IS_BASE_SINK (sink), FALSE);
709 GST_OBJECT_LOCK (sink);
711 GST_OBJECT_UNLOCK (sink);
717 * gst_base_sink_set_max_lateness:
719 * @max_lateness: the new max lateness value.
721 * Sets the new max lateness value to @max_lateness. This value is
722 * used to decide if a buffer should be dropped or not based on the
723 * buffer timestamp and the current clock time. A value of -1 means
729 gst_base_sink_set_max_lateness (GstBaseSink * sink, gint64 max_lateness)
731 g_return_if_fail (GST_IS_BASE_SINK (sink));
733 GST_OBJECT_LOCK (sink);
734 sink->abidata.ABI.max_lateness = max_lateness;
735 GST_OBJECT_UNLOCK (sink);
739 * gst_base_sink_get_max_lateness:
742 * Gets the max lateness value. See gst_base_sink_set_max_lateness for
745 * Returns: The maximum time in nanoseconds that a buffer can be late
746 * before it is dropped and not rendered. A value of -1 means an
752 gst_base_sink_get_max_lateness (GstBaseSink * sink)
756 g_return_val_if_fail (GST_IS_BASE_SINK (sink), -1);
758 GST_OBJECT_LOCK (sink);
759 res = sink->abidata.ABI.max_lateness;
760 GST_OBJECT_UNLOCK (sink);
766 * gst_base_sink_set_qos_enabled:
768 * @enabled: the new qos value.
770 * Configures @sink to send Quality-of-Service events upstream.
775 gst_base_sink_set_qos_enabled (GstBaseSink * sink, gboolean enabled)
777 g_return_if_fail (GST_IS_BASE_SINK (sink));
779 g_atomic_int_set (&sink->priv->qos_enabled, enabled);
783 * gst_base_sink_is_qos_enabled:
786 * Checks if @sink is currently configured to send Quality-of-Service events
789 * Returns: TRUE if the sink is configured to perform Quality-of-Service.
794 gst_base_sink_is_qos_enabled (GstBaseSink * sink)
798 g_return_val_if_fail (GST_IS_BASE_SINK (sink), FALSE);
800 res = g_atomic_int_get (&sink->priv->qos_enabled);
806 * gst_base_sink_set_async_enabled:
808 * @enabled: the new async value.
810 * Configures @sink to perform all state changes asynchronusly. When async is
811 * disabled, the sink will immediatly go to PAUSED instead of waiting for a
812 * preroll buffer. This feature is usefull if the sink does not synchronize
813 * against the clock or when it is dealing with sparse streams.
818 gst_base_sink_set_async_enabled (GstBaseSink * sink, gboolean enabled)
820 g_return_if_fail (GST_IS_BASE_SINK (sink));
822 GST_PAD_PREROLL_LOCK (sink->sinkpad);
823 sink->priv->async_enabled = enabled;
824 GST_LOG_OBJECT (sink, "set async enabled to %d", enabled);
825 GST_PAD_PREROLL_UNLOCK (sink->sinkpad);
829 * gst_base_sink_is_async_enabled:
832 * Checks if @sink is currently configured to perform asynchronous state
835 * Returns: TRUE if the sink is configured to perform asynchronous state
841 gst_base_sink_is_async_enabled (GstBaseSink * sink)
845 g_return_val_if_fail (GST_IS_BASE_SINK (sink), FALSE);
847 GST_PAD_PREROLL_LOCK (sink->sinkpad);
848 res = sink->priv->async_enabled;
849 GST_PAD_PREROLL_UNLOCK (sink->sinkpad);
855 * gst_base_sink_set_ts_offset:
857 * @offset: the new offset
859 * Adjust the synchronisation of @sink with @offset. A negative value will
860 * render buffers earlier than their timestamp. A positive value will delay
861 * rendering. This function can be used to fix playback of badly timestamped
867 gst_base_sink_set_ts_offset (GstBaseSink * sink, GstClockTimeDiff offset)
869 g_return_if_fail (GST_IS_BASE_SINK (sink));
871 GST_OBJECT_LOCK (sink);
872 sink->priv->ts_offset = offset;
873 GST_LOG_OBJECT (sink, "set time offset to %" G_GINT64_FORMAT, offset);
874 GST_OBJECT_UNLOCK (sink);
878 * gst_base_sink_get_ts_offset:
881 * Get the synchronisation offset of @sink.
883 * Returns: The synchronisation offset.
888 gst_base_sink_get_ts_offset (GstBaseSink * sink)
890 GstClockTimeDiff res;
892 g_return_val_if_fail (GST_IS_BASE_SINK (sink), 0);
894 GST_OBJECT_LOCK (sink);
895 res = sink->priv->ts_offset;
896 GST_OBJECT_UNLOCK (sink);
902 * gst_base_sink_get_last_buffer:
905 * Get the last buffer that arrived in the sink and was used for preroll or for
906 * rendering. This property can be used to generate thumbnails.
908 * The #GstCaps on the buffer can be used to determine the type of the buffer.
910 * Returns: a #GstBuffer. gst_buffer_unref() after usage. This function returns
911 * NULL when no buffer has arrived in the sink yet or when the sink is not in
917 gst_base_sink_get_last_buffer (GstBaseSink * sink)
921 g_return_val_if_fail (GST_IS_BASE_SINK (sink), NULL);
923 GST_OBJECT_LOCK (sink);
924 if ((res = sink->priv->last_buffer))
925 gst_buffer_ref (res);
926 GST_OBJECT_UNLOCK (sink);
932 gst_base_sink_set_last_buffer (GstBaseSink * sink, GstBuffer * buffer)
936 GST_OBJECT_LOCK (sink);
937 old = sink->priv->last_buffer;
938 if (G_LIKELY (old != buffer)) {
939 GST_DEBUG_OBJECT (sink, "setting last buffer to %p", buffer);
940 if (G_LIKELY (buffer))
941 gst_buffer_ref (buffer);
942 sink->priv->last_buffer = buffer;
946 GST_OBJECT_UNLOCK (sink);
948 /* avoid unreffing with the lock because cleanup code might want to take the
951 gst_buffer_unref (old);
955 * gst_base_sink_get_latency:
958 * Get the currently configured latency.
960 * Returns: The configured latency.
965 gst_base_sink_get_latency (GstBaseSink * sink)
969 GST_OBJECT_LOCK (sink);
970 res = sink->priv->latency;
971 GST_OBJECT_UNLOCK (sink);
977 * gst_base_sink_query_latency:
979 * @live: if the sink is live
980 * @upstream_live: if an upstream element is live
981 * @min_latency: the min latency of the upstream elements
982 * @max_latency: the max latency of the upstream elements
984 * Query the sink for the latency parameters. The latency will be queried from
985 * the upstream elements. @live will be TRUE if @sink is configured to
986 * synchronize against the clock. @upstream_live will be TRUE if an upstream
989 * If both @live and @upstream_live are TRUE, the sink will want to compensate
990 * for the latency introduced by the upstream elements by setting the
991 * @min_latency to a strictly possitive value.
993 * This function is mostly used by subclasses.
995 * Returns: TRUE if the query succeeded.
1000 gst_base_sink_query_latency (GstBaseSink * sink, gboolean * live,
1001 gboolean * upstream_live, GstClockTime * min_latency,
1002 GstClockTime * max_latency)
1004 gboolean l, us_live, res, have_latency;
1005 GstClockTime min, max, render_delay;
1007 GstClockTime us_min, us_max;
1009 /* we are live when we sync to the clock */
1010 GST_OBJECT_LOCK (sink);
1012 have_latency = sink->priv->have_latency;
1013 render_delay = sink->priv->render_delay;
1014 GST_OBJECT_UNLOCK (sink);
1016 /* assume no latency */
1022 GST_DEBUG_OBJECT (sink, "we are ready for LATENCY query");
1023 /* we are ready for a latency query this is when we preroll or when we are
1025 query = gst_query_new_latency ();
1027 /* ask the peer for the latency */
1028 if ((res = gst_pad_peer_query (sink->sinkpad, query))) {
1029 /* get upstream min and max latency */
1030 gst_query_parse_latency (query, &us_live, &us_min, &us_max);
1033 /* upstream live, use its latency, subclasses should use these
1034 * values to create the complete latency. */
1039 /* we need to add the render delay if we are live */
1041 min += render_delay;
1043 max += render_delay;
1046 gst_query_unref (query);
1048 GST_DEBUG_OBJECT (sink, "we are not yet ready for LATENCY query");
1052 /* not live, we tried to do the query, if it failed we return TRUE anyway */
1056 GST_DEBUG_OBJECT (sink, "latency query failed but we are not live");
1058 GST_DEBUG_OBJECT (sink, "latency query failed and we are live");
1063 GST_DEBUG_OBJECT (sink, "latency query: live: %d, have_latency %d,"
1064 " upstream: %d, min %" GST_TIME_FORMAT ", max %" GST_TIME_FORMAT, l,
1065 have_latency, us_live, GST_TIME_ARGS (min), GST_TIME_ARGS (max));
1070 *upstream_live = us_live;
1080 * gst_base_sink_set_render_delay:
1081 * @sink: a #GstBaseSink
1082 * @delay: the new delay
1084 * Set the render delay in @sink to @delay. The render delay is the time
1085 * between actual rendering of a buffer and its synchronisation time. Some
1086 * devices might delay media rendering which can be compensated for with this
1089 * After calling this function, this sink will report additional latency and
1090 * other sinks will adjust their latency to delay the rendering of their media.
1092 * This function is usually called by subclasses.
1097 gst_base_sink_set_render_delay (GstBaseSink * sink, GstClockTime delay)
1099 GstClockTime old_render_delay;
1101 g_return_if_fail (GST_IS_BASE_SINK (sink));
1103 GST_OBJECT_LOCK (sink);
1104 old_render_delay = sink->priv->render_delay;
1105 sink->priv->render_delay = delay;
1106 GST_LOG_OBJECT (sink, "set render delay to %" GST_TIME_FORMAT,
1107 GST_TIME_ARGS (delay));
1108 GST_OBJECT_UNLOCK (sink);
1110 if (delay != old_render_delay) {
1111 GST_DEBUG_OBJECT (sink, "posting latency changed");
1112 gst_element_post_message (GST_ELEMENT_CAST (sink),
1113 gst_message_new_latency (GST_OBJECT_CAST (sink)));
1118 * gst_base_sink_get_render_delay:
1119 * @sink: a #GstBaseSink
1121 * Get the render delay of @sink. see gst_base_sink_set_render_delay() for more
1122 * information about the render delay.
1124 * Returns: the render delay of @sink.
1129 gst_base_sink_get_render_delay (GstBaseSink * sink)
1131 GstClockTimeDiff res;
1133 g_return_val_if_fail (GST_IS_BASE_SINK (sink), 0);
1135 GST_OBJECT_LOCK (sink);
1136 res = sink->priv->render_delay;
1137 GST_OBJECT_UNLOCK (sink);
1143 * gst_base_sink_set_blocksize:
1144 * @sink: a #GstBaseSink
1145 * @blocksize: the blocksize in bytes
1147 * Set the number of bytes that the sink will pull when it is operating in pull
1153 gst_base_sink_set_blocksize (GstBaseSink * sink, guint blocksize)
1155 g_return_if_fail (GST_IS_BASE_SINK (sink));
1157 GST_OBJECT_LOCK (sink);
1158 sink->priv->blocksize = blocksize;
1159 GST_LOG_OBJECT (sink, "set blocksize to %u", blocksize);
1160 GST_OBJECT_UNLOCK (sink);
1164 * gst_base_sink_get_blocksize:
1165 * @sink: a #GstBaseSink
1167 * Get the number of bytes that the sink will pull when it is operating in pull
1170 * Returns: the number of bytes @sink will pull in pull mode.
1175 gst_base_sink_get_blocksize (GstBaseSink * sink)
1179 g_return_val_if_fail (GST_IS_BASE_SINK (sink), 0);
1181 GST_OBJECT_LOCK (sink);
1182 res = sink->priv->blocksize;
1183 GST_OBJECT_UNLOCK (sink);
1189 gst_base_sink_set_property (GObject * object, guint prop_id,
1190 const GValue * value, GParamSpec * pspec)
1192 GstBaseSink *sink = GST_BASE_SINK (object);
1195 case PROP_PREROLL_QUEUE_LEN:
1196 /* preroll lock necessary to serialize with finish_preroll */
1197 GST_PAD_PREROLL_LOCK (sink->sinkpad);
1198 sink->preroll_queue_max_len = g_value_get_uint (value);
1199 GST_PAD_PREROLL_UNLOCK (sink->sinkpad);
1202 gst_base_sink_set_sync (sink, g_value_get_boolean (value));
1204 case PROP_MAX_LATENESS:
1205 gst_base_sink_set_max_lateness (sink, g_value_get_int64 (value));
1208 gst_base_sink_set_qos_enabled (sink, g_value_get_boolean (value));
1211 gst_base_sink_set_async_enabled (sink, g_value_get_boolean (value));
1213 case PROP_TS_OFFSET:
1214 gst_base_sink_set_ts_offset (sink, g_value_get_int64 (value));
1216 case PROP_BLOCKSIZE:
1217 gst_base_sink_set_blocksize (sink, g_value_get_uint (value));
1219 case PROP_RENDER_DELAY:
1220 gst_base_sink_set_render_delay (sink, g_value_get_uint64 (value));
1223 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1229 gst_base_sink_get_property (GObject * object, guint prop_id, GValue * value,
1232 GstBaseSink *sink = GST_BASE_SINK (object);
1235 case PROP_PREROLL_QUEUE_LEN:
1236 GST_PAD_PREROLL_LOCK (sink->sinkpad);
1237 g_value_set_uint (value, sink->preroll_queue_max_len);
1238 GST_PAD_PREROLL_UNLOCK (sink->sinkpad);
1241 g_value_set_boolean (value, gst_base_sink_get_sync (sink));
1243 case PROP_MAX_LATENESS:
1244 g_value_set_int64 (value, gst_base_sink_get_max_lateness (sink));
1247 g_value_set_boolean (value, gst_base_sink_is_qos_enabled (sink));
1250 g_value_set_boolean (value, gst_base_sink_is_async_enabled (sink));
1252 case PROP_TS_OFFSET:
1253 g_value_set_int64 (value, gst_base_sink_get_ts_offset (sink));
1255 case PROP_LAST_BUFFER:
1256 gst_value_take_buffer (value, gst_base_sink_get_last_buffer (sink));
1258 case PROP_BLOCKSIZE:
1259 g_value_set_uint (value, gst_base_sink_get_blocksize (sink));
1261 case PROP_RENDER_DELAY:
1262 g_value_set_uint64 (value, gst_base_sink_get_render_delay (sink));
1265 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1272 gst_base_sink_get_caps (GstBaseSink * sink)
1278 gst_base_sink_set_caps (GstBaseSink * sink, GstCaps * caps)
1283 static GstFlowReturn
1284 gst_base_sink_buffer_alloc (GstBaseSink * sink, guint64 offset, guint size,
1285 GstCaps * caps, GstBuffer ** buf)
1291 /* with PREROLL_LOCK, STREAM_LOCK */
1293 gst_base_sink_preroll_queue_flush (GstBaseSink * basesink, GstPad * pad)
1297 GST_DEBUG_OBJECT (basesink, "flushing queue %p", basesink);
1298 while ((obj = g_queue_pop_head (basesink->preroll_queue))) {
1299 GST_DEBUG_OBJECT (basesink, "popped %p", obj);
1300 gst_mini_object_unref (obj);
1302 /* we can't have EOS anymore now */
1303 basesink->eos = FALSE;
1304 basesink->priv->received_eos = FALSE;
1305 basesink->have_preroll = FALSE;
1306 basesink->priv->step_unlock = FALSE;
1307 basesink->eos_queued = FALSE;
1308 basesink->preroll_queued = 0;
1309 basesink->buffers_queued = 0;
1310 basesink->events_queued = 0;
1311 /* can't report latency anymore until we preroll again */
1312 if (basesink->priv->async_enabled) {
1313 GST_OBJECT_LOCK (basesink);
1314 basesink->priv->have_latency = FALSE;
1315 GST_OBJECT_UNLOCK (basesink);
1317 /* and signal any waiters now */
1318 GST_PAD_PREROLL_SIGNAL (pad);
1321 /* with STREAM_LOCK, configures given segment with the event information. */
1323 gst_base_sink_configure_segment (GstBaseSink * basesink, GstPad * pad,
1324 GstEvent * event, GstSegment * segment)
1327 gdouble rate, arate;
1333 /* the newsegment event is needed to bring the buffer timestamps to the
1334 * stream time and to drop samples outside of the playback segment. */
1335 gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
1336 &start, &stop, &time);
1338 /* The segment is protected with both the STREAM_LOCK and the OBJECT_LOCK.
1339 * We protect with the OBJECT_LOCK so that we can use the values to
1340 * safely answer a POSITION query. */
1341 GST_OBJECT_LOCK (basesink);
1342 gst_segment_set_newsegment_full (segment, update, rate, arate, format, start,
1345 if (format == GST_FORMAT_TIME) {
1346 GST_DEBUG_OBJECT (basesink,
1347 "configured NEWSEGMENT update %d, rate %lf, applied rate %lf, "
1348 "format GST_FORMAT_TIME, "
1349 "%" GST_TIME_FORMAT " -- %" GST_TIME_FORMAT
1350 ", time %" GST_TIME_FORMAT ", accum %" GST_TIME_FORMAT,
1351 update, rate, arate, GST_TIME_ARGS (segment->start),
1352 GST_TIME_ARGS (segment->stop), GST_TIME_ARGS (segment->time),
1353 GST_TIME_ARGS (segment->accum));
1355 GST_DEBUG_OBJECT (basesink,
1356 "configured NEWSEGMENT update %d, rate %lf, applied rate %lf, "
1358 "%" G_GINT64_FORMAT " -- %" G_GINT64_FORMAT ", time %"
1359 G_GINT64_FORMAT ", accum %" G_GINT64_FORMAT, update, rate, arate,
1360 segment->format, segment->start, segment->stop, segment->time,
1363 GST_OBJECT_UNLOCK (basesink);
1366 /* with PREROLL_LOCK, STREAM_LOCK */
1368 gst_base_sink_commit_state (GstBaseSink * basesink)
1370 /* commit state and proceed to next pending state */
1371 GstState current, next, pending, post_pending;
1372 gboolean post_paused = FALSE;
1373 gboolean post_async_done = FALSE;
1374 gboolean post_playing = FALSE;
1376 /* we are certainly not playing async anymore now */
1377 basesink->playing_async = FALSE;
1379 GST_OBJECT_LOCK (basesink);
1380 current = GST_STATE (basesink);
1381 next = GST_STATE_NEXT (basesink);
1382 pending = GST_STATE_PENDING (basesink);
1383 post_pending = pending;
1386 case GST_STATE_PLAYING:
1388 GstBaseSinkClass *bclass;
1389 GstStateChangeReturn ret;
1391 bclass = GST_BASE_SINK_GET_CLASS (basesink);
1393 GST_DEBUG_OBJECT (basesink, "commiting state to PLAYING");
1395 basesink->need_preroll = FALSE;
1396 post_async_done = TRUE;
1397 basesink->priv->commited = TRUE;
1398 post_playing = TRUE;
1399 /* post PAUSED too when we were READY */
1400 if (current == GST_STATE_READY) {
1404 /* make sure we notify the subclass of async playing */
1405 if (bclass->async_play) {
1406 GST_WARNING_OBJECT (basesink, "deprecated async_play");
1407 ret = bclass->async_play (basesink);
1408 if (ret == GST_STATE_CHANGE_FAILURE)
1413 case GST_STATE_PAUSED:
1414 GST_DEBUG_OBJECT (basesink, "commiting state to PAUSED");
1416 post_async_done = TRUE;
1417 basesink->priv->commited = TRUE;
1418 post_pending = GST_STATE_VOID_PENDING;
1420 case GST_STATE_READY:
1421 case GST_STATE_NULL:
1423 case GST_STATE_VOID_PENDING:
1424 goto nothing_pending;
1429 /* we can report latency queries now */
1430 basesink->priv->have_latency = TRUE;
1432 GST_STATE (basesink) = pending;
1433 GST_STATE_NEXT (basesink) = GST_STATE_VOID_PENDING;
1434 GST_STATE_PENDING (basesink) = GST_STATE_VOID_PENDING;
1435 GST_STATE_RETURN (basesink) = GST_STATE_CHANGE_SUCCESS;
1436 GST_OBJECT_UNLOCK (basesink);
1439 GST_DEBUG_OBJECT (basesink, "posting PAUSED state change message");
1440 gst_element_post_message (GST_ELEMENT_CAST (basesink),
1441 gst_message_new_state_changed (GST_OBJECT_CAST (basesink),
1442 current, next, post_pending));
1444 if (post_async_done) {
1445 GST_DEBUG_OBJECT (basesink, "posting async-done message");
1446 gst_element_post_message (GST_ELEMENT_CAST (basesink),
1447 gst_message_new_async_done (GST_OBJECT_CAST (basesink)));
1450 GST_DEBUG_OBJECT (basesink, "posting PLAYING state change message");
1451 gst_element_post_message (GST_ELEMENT_CAST (basesink),
1452 gst_message_new_state_changed (GST_OBJECT_CAST (basesink),
1453 next, pending, GST_STATE_VOID_PENDING));
1456 GST_STATE_BROADCAST (basesink);
1462 /* Depending on the state, set our vars. We get in this situation when the
1463 * state change function got a change to update the state vars before the
1464 * streaming thread did. This is fine but we need to make sure that we
1465 * update the need_preroll var since it was TRUE when we got here and might
1466 * become FALSE if we got to PLAYING. */
1467 GST_DEBUG_OBJECT (basesink, "nothing to commit, now in %s",
1468 gst_element_state_get_name (current));
1470 case GST_STATE_PLAYING:
1471 basesink->need_preroll = FALSE;
1473 case GST_STATE_PAUSED:
1474 basesink->need_preroll = TRUE;
1477 basesink->need_preroll = FALSE;
1478 basesink->flushing = TRUE;
1481 /* we can report latency queries now */
1482 basesink->priv->have_latency = TRUE;
1483 GST_OBJECT_UNLOCK (basesink);
1488 /* app is going to READY */
1489 GST_DEBUG_OBJECT (basesink, "stopping");
1490 basesink->need_preroll = FALSE;
1491 basesink->flushing = TRUE;
1492 GST_OBJECT_UNLOCK (basesink);
1497 GST_DEBUG_OBJECT (basesink, "async commit failed");
1498 GST_STATE_RETURN (basesink) = GST_STATE_CHANGE_FAILURE;
1499 GST_OBJECT_UNLOCK (basesink);
1505 start_stepping (GstBaseSink * sink, GstSegment * segment,
1506 GstStepInfo * pending, GstStepInfo * current)
1509 GstMessage *message;
1511 GST_DEBUG_OBJECT (sink, "update pending step");
1513 GST_OBJECT_LOCK (sink);
1514 memcpy (current, pending, sizeof (GstStepInfo));
1515 pending->valid = FALSE;
1516 GST_OBJECT_UNLOCK (sink);
1518 /* post message first */
1520 gst_message_new_step_start (GST_OBJECT (sink), TRUE, current->format,
1521 current->amount, current->rate, current->flush, current->intermediate);
1522 gst_message_set_seqnum (message, current->seqnum);
1523 gst_element_post_message (GST_ELEMENT (sink), message);
1525 /* get the running time of where we paused and remember it */
1526 current->start = gst_element_get_start_time (GST_ELEMENT_CAST (sink));
1527 gst_segment_set_running_time (segment, GST_FORMAT_TIME, current->start);
1529 /* set the new rate for the remainder of the segment */
1530 current->start_rate = segment->rate;
1531 segment->rate *= current->rate;
1532 segment->abs_rate = ABS (segment->rate);
1535 if (segment->rate > 0.0)
1536 current->start_stop = segment->stop;
1538 current->start_start = segment->start;
1540 if (current->format == GST_FORMAT_TIME) {
1541 end = current->start + current->amount;
1542 if (!current->flush) {
1543 /* update the segment clipping regions for non-flushing seeks */
1544 if (segment->rate > 0.0) {
1545 segment->stop = gst_segment_to_position (segment, GST_FORMAT_TIME, end);
1546 segment->last_stop = segment->stop;
1550 position = gst_segment_to_position (segment, GST_FORMAT_TIME, end);
1551 segment->time = position;
1552 segment->start = position;
1553 segment->last_stop = position;
1558 GST_DEBUG_OBJECT (sink,
1559 "segment now rate %lf, applied rate %lf, "
1560 "format GST_FORMAT_TIME, "
1561 "%" GST_TIME_FORMAT " -- %" GST_TIME_FORMAT
1562 ", time %" GST_TIME_FORMAT ", accum %" GST_TIME_FORMAT,
1563 segment->rate, segment->applied_rate, GST_TIME_ARGS (segment->start),
1564 GST_TIME_ARGS (segment->stop), GST_TIME_ARGS (segment->time),
1565 GST_TIME_ARGS (segment->accum));
1567 GST_DEBUG_OBJECT (sink, "step started at running_time %" GST_TIME_FORMAT,
1568 GST_TIME_ARGS (current->start));
1570 if (current->amount == -1) {
1571 GST_DEBUG_OBJECT (sink, "step amount == -1, stop stepping");
1572 current->valid = FALSE;
1574 GST_DEBUG_OBJECT (sink, "step amount: %" G_GUINT64_FORMAT ", format: %s, "
1575 "rate: %f", current->amount, gst_format_get_name (current->format),
1581 stop_stepping (GstBaseSink * sink, GstSegment * segment,
1582 GstStepInfo * current, gint64 rstart, gint64 rstop, gboolean eos)
1584 gint64 stop, position;
1585 GstMessage *message;
1587 GST_DEBUG_OBJECT (sink, "step complete");
1589 if (segment->rate > 0.0)
1594 GST_DEBUG_OBJECT (sink,
1595 "step stop at running_time %" GST_TIME_FORMAT, GST_TIME_ARGS (stop));
1598 current->duration = current->position;
1600 current->duration = stop - current->start;
1602 GST_DEBUG_OBJECT (sink, "step elapsed running_time %" GST_TIME_FORMAT,
1603 GST_TIME_ARGS (current->duration));
1605 position = current->start + current->duration;
1607 /* now move the segment to the new running time */
1608 gst_segment_set_running_time (segment, GST_FORMAT_TIME, position);
1610 if (current->flush) {
1611 /* and remove the accumulated time we flushed, start time did not change */
1612 segment->accum = current->start;
1614 /* start time is now the stepped position */
1615 gst_element_set_start_time (GST_ELEMENT_CAST (sink), position);
1618 /* restore the previous rate */
1619 segment->rate = current->start_rate;
1620 segment->abs_rate = ABS (segment->rate);
1622 if (segment->rate > 0.0)
1623 segment->stop = current->start_stop;
1625 segment->start = current->start_start;
1627 /* the clip segment is used for position report in paused... */
1628 memcpy (sink->abidata.ABI.clip_segment, segment, sizeof (GstSegment));
1630 /* post the step done when we know the stepped duration in TIME */
1632 gst_message_new_step_done (GST_OBJECT_CAST (sink), current->format,
1633 current->amount, current->rate, current->flush, current->intermediate,
1634 current->duration, eos);
1635 gst_message_set_seqnum (message, current->seqnum);
1636 gst_element_post_message (GST_ELEMENT_CAST (sink), message);
1638 if (!current->intermediate)
1639 sink->need_preroll = current->need_preroll;
1641 /* and the current step info finished and becomes invalid */
1642 current->valid = FALSE;
1646 handle_stepping (GstBaseSink * sink, GstSegment * segment,
1647 GstStepInfo * current, gint64 * cstart, gint64 * cstop, gint64 * rstart,
1650 gboolean step_end = FALSE;
1652 /* see if we need to skip this buffer because of stepping */
1653 switch (current->format) {
1654 case GST_FORMAT_TIME:
1659 if (segment->rate > 0.0) {
1660 if (segment->stop == *cstop)
1661 *rstop = *rstart + current->amount;
1666 if (segment->start == *cstart)
1667 *rstart = *rstop + current->amount;
1673 end = current->start + current->amount;
1674 current->position = first - current->start;
1676 if (G_UNLIKELY (segment->abs_rate != 1.0))
1677 current->position /= segment->abs_rate;
1679 GST_DEBUG_OBJECT (sink,
1680 "buffer: %" GST_TIME_FORMAT "-%" GST_TIME_FORMAT,
1681 GST_TIME_ARGS (first), GST_TIME_ARGS (last));
1682 GST_DEBUG_OBJECT (sink,
1683 "got time step %" GST_TIME_FORMAT "-%" GST_TIME_FORMAT "/%"
1684 GST_TIME_FORMAT, GST_TIME_ARGS (current->position),
1685 GST_TIME_ARGS (last - current->start),
1686 GST_TIME_ARGS (current->amount));
1688 if ((current->flush && current->position >= current->amount)
1690 GST_DEBUG_OBJECT (sink, "step ended, we need clipping");
1692 if (segment->rate > 0.0) {
1694 *cstart = gst_segment_to_position (segment, GST_FORMAT_TIME, end);
1697 *cstop = gst_segment_to_position (segment, GST_FORMAT_TIME, end);
1700 GST_DEBUG_OBJECT (sink,
1701 "cstart %" GST_TIME_FORMAT ", rstart %" GST_TIME_FORMAT,
1702 GST_TIME_ARGS (*cstart), GST_TIME_ARGS (*rstart));
1703 GST_DEBUG_OBJECT (sink,
1704 "cstop %" GST_TIME_FORMAT ", rstop %" GST_TIME_FORMAT,
1705 GST_TIME_ARGS (*cstop), GST_TIME_ARGS (*rstop));
1708 case GST_FORMAT_BUFFERS:
1709 GST_DEBUG_OBJECT (sink,
1710 "got default step %" G_GUINT64_FORMAT "/%" G_GUINT64_FORMAT,
1711 current->position, current->amount);
1713 if (current->position < current->amount) {
1714 current->position++;
1719 case GST_FORMAT_DEFAULT:
1721 GST_DEBUG_OBJECT (sink,
1722 "got unknown step %" G_GUINT64_FORMAT "/%" G_GUINT64_FORMAT,
1723 current->position, current->amount);
1729 /* with STREAM_LOCK, PREROLL_LOCK
1731 * Returns TRUE if the object needs synchronisation and takes therefore
1732 * part in prerolling.
1734 * rsstart/rsstop contain the start/stop in stream time.
1735 * rrstart/rrstop contain the start/stop in running time.
1738 gst_base_sink_get_sync_times (GstBaseSink * basesink, GstMiniObject * obj,
1739 GstClockTime * rsstart, GstClockTime * rsstop,
1740 GstClockTime * rrstart, GstClockTime * rrstop, gboolean * do_sync,
1741 gboolean * stepped, GstSegment * segment, GstStepInfo * step,
1742 gboolean * step_end)
1744 GstBaseSinkClass *bclass;
1746 GstClockTime start, stop; /* raw start/stop timestamps */
1747 gint64 cstart, cstop; /* clipped raw timestamps */
1748 gint64 rstart, rstop; /* clipped timestamps converted to running time */
1749 GstClockTime sstart, sstop; /* clipped timestamps converted to stream time */
1751 GstBaseSinkPrivate *priv;
1754 priv = basesink->priv;
1756 /* start with nothing */
1757 start = stop = GST_CLOCK_TIME_NONE;
1759 if (G_UNLIKELY (GST_IS_EVENT (obj))) {
1760 GstEvent *event = GST_EVENT_CAST (obj);
1762 switch (GST_EVENT_TYPE (event)) {
1763 /* EOS event needs syncing */
1766 if (basesink->segment.rate >= 0.0) {
1767 sstart = sstop = priv->current_sstop;
1768 if (!GST_CLOCK_TIME_IS_VALID (sstart)) {
1769 /* we have not seen a buffer yet, use the segment values */
1770 sstart = sstop = gst_segment_to_stream_time (&basesink->segment,
1771 basesink->segment.format, basesink->segment.stop);
1774 sstart = sstop = priv->current_sstart;
1775 if (!GST_CLOCK_TIME_IS_VALID (sstart)) {
1776 /* we have not seen a buffer yet, use the segment values */
1777 sstart = sstop = gst_segment_to_stream_time (&basesink->segment,
1778 basesink->segment.format, basesink->segment.start);
1782 rstart = rstop = priv->eos_rtime;
1783 *do_sync = rstart != -1;
1784 GST_DEBUG_OBJECT (basesink, "sync times for EOS %" GST_TIME_FORMAT,
1785 GST_TIME_ARGS (rstart));
1786 /* if we are stepping, we end now */
1787 *step_end = step->valid;
1792 /* other events do not need syncing */
1793 /* FIXME, maybe NEWSEGMENT might need synchronisation
1794 * since the POSITION query depends on accumulated times and
1795 * we cannot accumulate the current segment before the previous
1804 /* else do buffer sync code */
1805 buffer = GST_BUFFER_CAST (obj);
1807 bclass = GST_BASE_SINK_GET_CLASS (basesink);
1809 /* just get the times to see if we need syncing, if the start returns -1 we
1811 if (bclass->get_times)
1812 bclass->get_times (basesink, buffer, &start, &stop);
1814 if (!GST_CLOCK_TIME_IS_VALID (start)) {
1815 /* we don't need to sync but we still want to get the timestamps for
1816 * tracking the position */
1817 gst_base_sink_get_times (basesink, buffer, &start, &stop);
1823 GST_DEBUG_OBJECT (basesink, "got times start: %" GST_TIME_FORMAT
1824 ", stop: %" GST_TIME_FORMAT ", do_sync %d", GST_TIME_ARGS (start),
1825 GST_TIME_ARGS (stop), *do_sync);
1827 /* collect segment and format for code clarity */
1828 format = segment->format;
1830 /* no timestamp clipping if we did not get a TIME segment format */
1831 if (G_UNLIKELY (format != GST_FORMAT_TIME)) {
1834 /* do running and stream time in TIME format */
1835 format = GST_FORMAT_TIME;
1836 GST_LOG_OBJECT (basesink, "not time format, don't clip");
1840 /* clip, only when we know about time */
1841 if (G_UNLIKELY (!gst_segment_clip (segment, GST_FORMAT_TIME,
1842 (gint64) start, (gint64) stop, &cstart, &cstop))) {
1844 GST_DEBUG_OBJECT (basesink, "step out of segment");
1845 /* when we are stepping, pretend we're at the end of the segment */
1846 if (segment->rate > 0.0) {
1847 cstart = segment->stop;
1848 cstop = segment->stop;
1850 cstart = segment->start;
1851 cstop = segment->start;
1855 goto out_of_segment;
1858 if (G_UNLIKELY (start != cstart || stop != cstop)) {
1859 GST_DEBUG_OBJECT (basesink, "clipped to: start %" GST_TIME_FORMAT
1860 ", stop: %" GST_TIME_FORMAT, GST_TIME_ARGS (cstart),
1861 GST_TIME_ARGS (cstop));
1864 /* set last stop position */
1865 if (G_LIKELY (cstop != GST_CLOCK_TIME_NONE))
1866 gst_segment_set_last_stop (segment, GST_FORMAT_TIME, cstop);
1868 gst_segment_set_last_stop (segment, GST_FORMAT_TIME, cstart);
1871 rstart = gst_segment_to_running_time (segment, format, cstart);
1872 rstop = gst_segment_to_running_time (segment, format, cstop);
1874 if (G_UNLIKELY (step->valid)) {
1875 if (!(*step_end = handle_stepping (basesink, segment, step, &cstart, &cstop,
1876 &rstart, &rstop))) {
1877 /* step is still busy, we discard data when we are flushing */
1878 *stepped = step->flush;
1879 GST_DEBUG_OBJECT (basesink, "stepping busy");
1882 /* this can produce wrong values if we accumulated non-TIME segments. If this happens,
1883 * upstream is behaving very badly */
1884 sstart = gst_segment_to_stream_time (segment, format, cstart);
1885 sstop = gst_segment_to_stream_time (segment, format, cstop);
1888 /* eos_done label only called when doing EOS, we also stop stepping then */
1889 if (*step_end && step->flush) {
1890 GST_DEBUG_OBJECT (basesink, "flushing step ended");
1891 stop_stepping (basesink, segment, step, rstart, rstop, eos);
1901 /* buffers and EOS always need syncing and preroll */
1907 /* we usually clip in the chain function already but stepping could cause
1908 * the segment to be updated later. we return FALSE so that we don't try
1910 GST_LOG_OBJECT (basesink, "buffer skipped, not in segment");
1915 /* with STREAM_LOCK, PREROLL_LOCK, LOCK
1916 * adjust a timestamp with the latency and timestamp offset */
1918 gst_base_sink_adjust_time (GstBaseSink * basesink, GstClockTime time)
1920 GstClockTimeDiff ts_offset;
1922 /* don't do anything funny with invalid timestamps */
1923 if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (time)))
1926 time += basesink->priv->latency;
1928 /* apply offset, be carefull for underflows */
1929 ts_offset = basesink->priv->ts_offset;
1930 if (ts_offset < 0) {
1931 ts_offset = -ts_offset;
1932 if (ts_offset < time)
1943 * gst_base_sink_wait_clock:
1945 * @time: the running_time to be reached
1946 * @jitter: the jitter to be filled with time diff (can be NULL)
1948 * This function will block until @time is reached. It is usually called by
1949 * subclasses that use their own internal synchronisation.
1951 * If @time is not valid, no sycnhronisation is done and #GST_CLOCK_BADTIME is
1952 * returned. Likewise, if synchronisation is disabled in the element or there
1953 * is no clock, no synchronisation is done and #GST_CLOCK_BADTIME is returned.
1955 * This function should only be called with the PREROLL_LOCK held, like when
1956 * receiving an EOS event in the #GstBaseSinkClass.event() vmethod or when
1957 * receiving a buffer in
1958 * the #GstBaseSinkClass.render() vmethod.
1960 * The @time argument should be the running_time of when this method should
1961 * return and is not adjusted with any latency or offset configured in the
1966 * Returns: #GstClockReturn
1969 gst_base_sink_wait_clock (GstBaseSink * sink, GstClockTime time,
1970 GstClockTimeDiff * jitter)
1975 GstClockTime base_time;
1977 if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (time)))
1980 GST_OBJECT_LOCK (sink);
1981 if (G_UNLIKELY (!sink->sync))
1984 if (G_UNLIKELY ((clock = GST_ELEMENT_CLOCK (sink)) == NULL))
1987 base_time = GST_ELEMENT_CAST (sink)->base_time;
1988 GST_LOG_OBJECT (sink,
1989 "time %" GST_TIME_FORMAT ", base_time %" GST_TIME_FORMAT,
1990 GST_TIME_ARGS (time), GST_TIME_ARGS (base_time));
1992 /* add base_time to running_time to get the time against the clock */
1995 id = gst_clock_new_single_shot_id (clock, time);
1996 GST_OBJECT_UNLOCK (sink);
1998 /* A blocking wait is performed on the clock. We save the ClockID
1999 * so we can unlock the entry at any time. While we are blocking, we
2000 * release the PREROLL_LOCK so that other threads can interrupt the
2002 sink->clock_id = id;
2003 /* release the preroll lock while waiting */
2004 GST_PAD_PREROLL_UNLOCK (sink->sinkpad);
2006 ret = gst_clock_id_wait (id, jitter);
2008 GST_PAD_PREROLL_LOCK (sink->sinkpad);
2009 gst_clock_id_unref (id);
2010 sink->clock_id = NULL;
2014 /* no syncing needed */
2017 GST_DEBUG_OBJECT (sink, "time not valid, no sync needed");
2018 return GST_CLOCK_BADTIME;
2022 GST_DEBUG_OBJECT (sink, "sync disabled");
2023 GST_OBJECT_UNLOCK (sink);
2024 return GST_CLOCK_BADTIME;
2028 GST_DEBUG_OBJECT (sink, "no clock, can't sync");
2029 GST_OBJECT_UNLOCK (sink);
2030 return GST_CLOCK_BADTIME;
2035 * gst_base_sink_wait_preroll:
2038 * If the #GstBaseSinkClass.render() method performs its own synchronisation
2039 * against the clock it must unblock when going from PLAYING to the PAUSED state
2040 * and call this method before continuing to render the remaining data.
2042 * This function will block until a state change to PLAYING happens (in which
2043 * case this function returns #GST_FLOW_OK) or the processing must be stopped due
2044 * to a state change to READY or a FLUSH event (in which case this function
2045 * returns #GST_FLOW_WRONG_STATE).
2047 * This function should only be called with the PREROLL_LOCK held, like in the
2052 * Returns: #GST_FLOW_OK if the preroll completed and processing can
2053 * continue. Any other return value should be returned from the render vmethod.
2056 gst_base_sink_wait_preroll (GstBaseSink * sink)
2058 sink->have_preroll = TRUE;
2059 GST_DEBUG_OBJECT (sink, "waiting in preroll for flush or PLAYING");
2060 /* block until the state changes, or we get a flush, or something */
2061 GST_PAD_PREROLL_WAIT (sink->sinkpad);
2062 sink->have_preroll = FALSE;
2063 if (G_UNLIKELY (sink->flushing))
2065 if (G_UNLIKELY (sink->priv->step_unlock))
2067 GST_DEBUG_OBJECT (sink, "continue after preroll");
2074 GST_DEBUG_OBJECT (sink, "preroll interrupted because of flush");
2075 return GST_FLOW_WRONG_STATE;
2079 sink->priv->step_unlock = FALSE;
2080 GST_DEBUG_OBJECT (sink, "preroll interrupted because of step");
2081 return GST_FLOW_STEP;
2086 * gst_base_sink_do_preroll:
2088 * @obj: the object that caused the preroll
2090 * If the @sink spawns its own thread for pulling buffers from upstream it
2091 * should call this method after it has pulled a buffer. If the element needed
2092 * to preroll, this function will perform the preroll and will then block
2093 * until the element state is changed.
2095 * This function should be called with the PREROLL_LOCK held.
2099 * Returns: #GST_FLOW_OK if the preroll completed and processing can
2100 * continue. Any other return value should be returned from the render vmethod.
2103 gst_base_sink_do_preroll (GstBaseSink * sink, GstMiniObject * obj)
2107 while (G_UNLIKELY (sink->need_preroll)) {
2108 GST_DEBUG_OBJECT (sink, "prerolling object %p", obj);
2110 ret = gst_base_sink_preroll_object (sink, FALSE, obj);
2111 if (ret != GST_FLOW_OK)
2112 goto preroll_failed;
2114 /* need to recheck here because the commit state could have
2115 * made us not need the preroll anymore */
2116 if (G_LIKELY (sink->need_preroll)) {
2117 /* block until the state changes, or we get a flush, or something */
2118 ret = gst_base_sink_wait_preroll (sink);
2119 if ((ret != GST_FLOW_OK) && (ret != GST_FLOW_STEP))
2120 goto preroll_failed;
2128 GST_DEBUG_OBJECT (sink, "preroll failed %d", ret);
2134 * gst_base_sink_wait_eos:
2136 * @time: the running_time to be reached
2137 * @jitter: the jitter to be filled with time diff (can be NULL)
2139 * This function will block until @time is reached. It is usually called by
2140 * subclasses that use their own internal synchronisation but want to let the
2141 * EOS be handled by the base class.
2143 * This function should only be called with the PREROLL_LOCK held, like when
2144 * receiving an EOS event in the ::event vmethod.
2146 * The @time argument should be the running_time of when the EOS should happen
2147 * and will be adjusted with any latency and offset configured in the sink.
2151 * Returns: #GstFlowReturn
2154 gst_base_sink_wait_eos (GstBaseSink * sink, GstClockTime time,
2155 GstClockTimeDiff * jitter)
2157 GstClockReturn status;
2163 GST_DEBUG_OBJECT (sink, "checking preroll");
2165 /* first wait for the playing state before we can continue */
2166 if (G_UNLIKELY (sink->need_preroll)) {
2167 ret = gst_base_sink_wait_preroll (sink);
2168 if ((ret != GST_FLOW_OK) && (ret != GST_FLOW_STEP))
2172 /* preroll done, we can sync since we are in PLAYING now. */
2173 GST_DEBUG_OBJECT (sink, "possibly waiting for clock to reach %"
2174 GST_TIME_FORMAT, GST_TIME_ARGS (time));
2176 /* compensate for latency and ts_offset. We don't adjust for render delay
2177 * because we don't interact with the device on EOS normally. */
2178 stime = gst_base_sink_adjust_time (sink, time);
2180 /* wait for the clock, this can be interrupted because we got shut down or
2182 status = gst_base_sink_wait_clock (sink, stime, jitter);
2184 GST_DEBUG_OBJECT (sink, "clock returned %d", status);
2186 /* invalid time, no clock or sync disabled, just continue then */
2187 if (status == GST_CLOCK_BADTIME)
2190 /* waiting could have been interrupted and we can be flushing now */
2191 if (G_UNLIKELY (sink->flushing))
2194 /* retry if we got unscheduled, which means we did not reach the timeout
2195 * yet. if some other error occures, we continue. */
2196 } while (status == GST_CLOCK_UNSCHEDULED);
2198 GST_DEBUG_OBJECT (sink, "end of stream");
2205 GST_DEBUG_OBJECT (sink, "we are flushing");
2206 return GST_FLOW_WRONG_STATE;
2210 /* with STREAM_LOCK, PREROLL_LOCK
2212 * Make sure we are in PLAYING and synchronize an object to the clock.
2214 * If we need preroll, we are not in PLAYING. We try to commit the state
2215 * if needed and then block if we still are not PLAYING.
2217 * We start waiting on the clock in PLAYING. If we got interrupted, we
2218 * immediatly try to re-preroll.
2220 * Some objects do not need synchronisation (most events) and so this function
2221 * immediatly returns GST_FLOW_OK.
2223 * for objects that arrive later than max-lateness to be synchronized to the
2224 * clock have the @late boolean set to TRUE.
2226 * This function keeps a running average of the jitter (the diff between the
2227 * clock time and the requested sync time). The jitter is negative for
2228 * objects that arrive in time and positive for late buffers.
2230 * does not take ownership of obj.
2232 static GstFlowReturn
2233 gst_base_sink_do_sync (GstBaseSink * basesink, GstPad * pad,
2234 GstMiniObject * obj, gboolean * late, gboolean * step_end)
2236 GstClockTimeDiff jitter;
2238 GstClockReturn status = GST_CLOCK_OK;
2239 GstClockTime rstart, rstop, sstart, sstop, stime;
2241 GstBaseSinkPrivate *priv;
2243 GstStepInfo *current, *pending;
2246 priv = basesink->priv;
2249 sstart = sstop = rstart = rstop = GST_CLOCK_TIME_NONE;
2253 priv->current_rstart = GST_CLOCK_TIME_NONE;
2255 /* get stepping info */
2256 current = &priv->current_step;
2257 pending = &priv->pending_step;
2259 /* get timing information for this object against the render segment */
2260 syncable = gst_base_sink_get_sync_times (basesink, obj,
2261 &sstart, &sstop, &rstart, &rstop, &do_sync, &stepped, &basesink->segment,
2264 if (G_UNLIKELY (stepped))
2267 /* a syncable object needs to participate in preroll and
2268 * clocking. All buffers and EOS are syncable. */
2269 if (G_UNLIKELY (!syncable))
2272 /* store timing info for current object */
2273 priv->current_rstart = rstart;
2274 priv->current_rstop = (GST_CLOCK_TIME_IS_VALID (rstop) ? rstop : rstart);
2276 /* save sync time for eos when the previous object needed sync */
2277 priv->eos_rtime = (do_sync ? priv->current_rstop : GST_CLOCK_TIME_NONE);
2280 /* first do preroll, this makes sure we commit our state
2281 * to PAUSED and can continue to PLAYING. We cannot perform
2282 * any clock sync in PAUSED because there is no clock. */
2283 ret = gst_base_sink_do_preroll (basesink, obj);
2284 if (G_UNLIKELY (ret != GST_FLOW_OK))
2285 goto preroll_failed;
2287 /* update the segment with a pending step if the current one is invalid and we
2288 * have a new pending one. We only accept new step updates after a preroll */
2289 if (G_UNLIKELY (pending->valid && !current->valid)) {
2290 start_stepping (basesink, &basesink->segment, pending, current);
2294 /* After rendering we store the position of the last buffer so that we can use
2295 * it to report the position. We need to take the lock here. */
2296 GST_OBJECT_LOCK (basesink);
2297 priv->current_sstart = sstart;
2298 priv->current_sstop = (GST_CLOCK_TIME_IS_VALID (sstop) ? sstop : sstart);
2299 GST_OBJECT_UNLOCK (basesink);
2304 /* adjust for latency */
2305 stime = gst_base_sink_adjust_time (basesink, rstart);
2307 /* adjust for render-delay, avoid underflows */
2308 if (GST_CLOCK_TIME_IS_VALID (stime)) {
2309 if (stime > priv->render_delay)
2310 stime -= priv->render_delay;
2315 /* preroll done, we can sync since we are in PLAYING now. */
2316 GST_DEBUG_OBJECT (basesink, "possibly waiting for clock to reach %"
2317 GST_TIME_FORMAT ", adjusted %" GST_TIME_FORMAT,
2318 GST_TIME_ARGS (rstart), GST_TIME_ARGS (stime));
2320 /* This function will return immediatly if start == -1, no clock
2321 * or sync is disabled with GST_CLOCK_BADTIME. */
2322 status = gst_base_sink_wait_clock (basesink, stime, &jitter);
2324 GST_DEBUG_OBJECT (basesink, "clock returned %d", status);
2326 /* invalid time, no clock or sync disabled, just render */
2327 if (status == GST_CLOCK_BADTIME)
2330 /* waiting could have been interrupted and we can be flushing now */
2331 if (G_UNLIKELY (basesink->flushing))
2334 /* check for unlocked by a state change, we are not flushing so
2335 * we can try to preroll on the current buffer. */
2336 if (G_UNLIKELY (status == GST_CLOCK_UNSCHEDULED)) {
2337 GST_DEBUG_OBJECT (basesink, "unscheduled, waiting some more");
2338 priv->call_preroll = TRUE;
2342 /* successful syncing done, record observation */
2343 priv->current_jitter = jitter;
2345 /* check if the object should be dropped */
2346 *late = gst_base_sink_is_too_late (basesink, obj, rstart, rstop,
2355 GST_DEBUG_OBJECT (basesink, "skipped stepped object %p", obj);
2361 GST_DEBUG_OBJECT (basesink, "non syncable object %p", obj);
2366 GST_DEBUG_OBJECT (basesink, "we are flushing");
2367 return GST_FLOW_WRONG_STATE;
2371 GST_DEBUG_OBJECT (basesink, "preroll failed");
2378 gst_base_sink_send_qos (GstBaseSink * basesink,
2379 gdouble proportion, GstClockTime time, GstClockTimeDiff diff)
2384 /* generate Quality-of-Service event */
2385 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, basesink,
2386 "qos: proportion: %lf, diff %" G_GINT64_FORMAT ", timestamp %"
2387 GST_TIME_FORMAT, proportion, diff, GST_TIME_ARGS (time));
2389 event = gst_event_new_qos (proportion, diff, time);
2392 res = gst_pad_push_event (basesink->sinkpad, event);
2398 gst_base_sink_perform_qos (GstBaseSink * sink, gboolean dropped)
2400 GstBaseSinkPrivate *priv;
2401 GstClockTime start, stop;
2402 GstClockTimeDiff jitter;
2403 GstClockTime pt, entered, left;
2404 GstClockTime duration;
2409 start = priv->current_rstart;
2411 if (priv->current_step.valid)
2414 /* if Quality-of-Service disabled, do nothing */
2415 if (!g_atomic_int_get (&priv->qos_enabled) ||
2416 !GST_CLOCK_TIME_IS_VALID (start))
2419 stop = priv->current_rstop;
2420 jitter = priv->current_jitter;
2423 /* this is the time the buffer entered the sink */
2424 if (start < -jitter)
2427 entered = start + jitter;
2430 /* this is the time the buffer entered the sink */
2431 entered = start + jitter;
2432 /* this is the time the buffer left the sink */
2433 left = start + jitter;
2436 /* calculate duration of the buffer */
2437 if (GST_CLOCK_TIME_IS_VALID (stop))
2438 duration = stop - start;
2440 duration = GST_CLOCK_TIME_NONE;
2442 /* if we have the time when the last buffer left us, calculate
2443 * processing time */
2444 if (GST_CLOCK_TIME_IS_VALID (priv->last_left)) {
2445 if (entered > priv->last_left) {
2446 pt = entered - priv->last_left;
2454 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, sink, "start: %" GST_TIME_FORMAT
2455 ", entered %" GST_TIME_FORMAT ", left %" GST_TIME_FORMAT ", pt: %"
2456 GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT ",jitter %"
2457 G_GINT64_FORMAT, GST_TIME_ARGS (start), GST_TIME_ARGS (entered),
2458 GST_TIME_ARGS (left), GST_TIME_ARGS (pt), GST_TIME_ARGS (duration),
2461 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, sink, "avg_duration: %" GST_TIME_FORMAT
2462 ", avg_pt: %" GST_TIME_FORMAT ", avg_rate: %g",
2463 GST_TIME_ARGS (priv->avg_duration), GST_TIME_ARGS (priv->avg_pt),
2466 /* collect running averages. for first observations, we copy the
2468 if (!GST_CLOCK_TIME_IS_VALID (priv->avg_duration))
2469 priv->avg_duration = duration;
2471 priv->avg_duration = UPDATE_RUNNING_AVG (priv->avg_duration, duration);
2473 if (!GST_CLOCK_TIME_IS_VALID (priv->avg_pt))
2476 priv->avg_pt = UPDATE_RUNNING_AVG (priv->avg_pt, pt);
2478 if (priv->avg_duration != 0)
2480 gst_guint64_to_gdouble (priv->avg_pt) /
2481 gst_guint64_to_gdouble (priv->avg_duration);
2485 if (GST_CLOCK_TIME_IS_VALID (priv->last_left)) {
2486 if (dropped || priv->avg_rate < 0.0) {
2487 priv->avg_rate = rate;
2490 priv->avg_rate = UPDATE_RUNNING_AVG_N (priv->avg_rate, rate);
2492 priv->avg_rate = UPDATE_RUNNING_AVG_P (priv->avg_rate, rate);
2496 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, sink,
2497 "updated: avg_duration: %" GST_TIME_FORMAT ", avg_pt: %" GST_TIME_FORMAT
2498 ", avg_rate: %g", GST_TIME_ARGS (priv->avg_duration),
2499 GST_TIME_ARGS (priv->avg_pt), priv->avg_rate);
2502 if (priv->avg_rate >= 0.0) {
2503 /* if we have a valid rate, start sending QoS messages */
2504 if (priv->current_jitter < 0) {
2505 /* make sure we never go below 0 when adding the jitter to the
2507 if (priv->current_rstart < -priv->current_jitter)
2508 priv->current_jitter = -priv->current_rstart;
2510 gst_base_sink_send_qos (sink, priv->avg_rate, priv->current_rstart,
2511 priv->current_jitter);
2514 /* record when this buffer will leave us */
2515 priv->last_left = left;
2518 /* reset all qos measuring */
2520 gst_base_sink_reset_qos (GstBaseSink * sink)
2522 GstBaseSinkPrivate *priv;
2526 priv->last_in_time = GST_CLOCK_TIME_NONE;
2527 priv->last_left = GST_CLOCK_TIME_NONE;
2528 priv->avg_duration = GST_CLOCK_TIME_NONE;
2529 priv->avg_pt = GST_CLOCK_TIME_NONE;
2530 priv->avg_rate = -1.0;
2531 priv->avg_render = GST_CLOCK_TIME_NONE;
2537 /* Checks if the object was scheduled too late.
2539 * start/stop contain the raw timestamp start and stop values
2542 * status and jitter contain the return values from the clock wait.
2544 * returns TRUE if the buffer was too late.
2547 gst_base_sink_is_too_late (GstBaseSink * basesink, GstMiniObject * obj,
2548 GstClockTime start, GstClockTime stop,
2549 GstClockReturn status, GstClockTimeDiff jitter)
2552 gint64 max_lateness;
2553 GstBaseSinkPrivate *priv;
2555 priv = basesink->priv;
2559 /* only for objects that were too late */
2560 if (G_LIKELY (status != GST_CLOCK_EARLY))
2563 max_lateness = basesink->abidata.ABI.max_lateness;
2565 /* check if frame dropping is enabled */
2566 if (max_lateness == -1)
2569 /* only check for buffers */
2570 if (G_UNLIKELY (!GST_IS_BUFFER (obj)))
2573 /* can't do check if we don't have a timestamp */
2574 if (G_UNLIKELY (!GST_CLOCK_TIME_IS_VALID (start)))
2577 /* we can add a valid stop time */
2578 if (GST_CLOCK_TIME_IS_VALID (stop))
2579 max_lateness += stop;
2581 max_lateness += start;
2583 /* if the jitter bigger than duration and lateness we are too late */
2584 if ((late = start + jitter > max_lateness)) {
2585 GST_CAT_DEBUG_OBJECT (GST_CAT_PERFORMANCE, basesink,
2586 "buffer is too late %" GST_TIME_FORMAT
2587 " > %" GST_TIME_FORMAT, GST_TIME_ARGS (start + jitter),
2588 GST_TIME_ARGS (max_lateness));
2589 /* !!emergency!!, if we did not receive anything valid for more than a
2590 * second, render it anyway so the user sees something */
2591 if (GST_CLOCK_TIME_IS_VALID (priv->last_in_time) &&
2592 start - priv->last_in_time > GST_SECOND) {
2594 GST_ELEMENT_WARNING (basesink, CORE, CLOCK,
2595 (_("A lot of buffers are being dropped.")),
2596 ("There may be a timestamping problem, or this computer is too slow."));
2597 GST_CAT_DEBUG_OBJECT (GST_CAT_PERFORMANCE, basesink,
2598 "**emergency** last buffer at %" GST_TIME_FORMAT " > GST_SECOND",
2599 GST_TIME_ARGS (priv->last_in_time));
2604 if (!late || !GST_CLOCK_TIME_IS_VALID (priv->last_in_time)) {
2605 priv->last_in_time = start;
2612 GST_DEBUG_OBJECT (basesink, "object was scheduled in time");
2617 GST_DEBUG_OBJECT (basesink, "frame dropping disabled");
2622 GST_DEBUG_OBJECT (basesink, "object is not a buffer");
2627 GST_DEBUG_OBJECT (basesink, "buffer has no timestamp");
2632 /* called before and after calling the render vmethod. It keeps track of how
2633 * much time was spent in the render method and is used to check if we are
2636 gst_base_sink_do_render_stats (GstBaseSink * basesink, gboolean start)
2638 GstBaseSinkPrivate *priv;
2640 priv = basesink->priv;
2643 priv->start = gst_util_get_timestamp ();
2645 GstClockTime elapsed;
2647 priv->stop = gst_util_get_timestamp ();
2649 elapsed = GST_CLOCK_DIFF (priv->start, priv->stop);
2651 if (!GST_CLOCK_TIME_IS_VALID (priv->avg_render))
2652 priv->avg_render = elapsed;
2654 priv->avg_render = UPDATE_RUNNING_AVG (priv->avg_render, elapsed);
2656 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, basesink,
2657 "avg_render: %" GST_TIME_FORMAT, GST_TIME_ARGS (priv->avg_render));
2661 /* with STREAM_LOCK, PREROLL_LOCK,
2663 * Synchronize the object on the clock and then render it.
2665 * takes ownership of obj.
2667 static GstFlowReturn
2668 gst_base_sink_render_object (GstBaseSink * basesink, GstPad * pad,
2669 gboolean is_list, gpointer obj)
2672 GstBaseSinkClass *bclass;
2673 gboolean late, step_end;
2676 GstBaseSinkPrivate *priv;
2678 priv = basesink->priv;
2682 * If buffer list, use the first group buffer within the list
2685 sync_obj = gst_buffer_list_get (GST_BUFFER_LIST_CAST (obj), 0, 0);
2686 g_assert (NULL != sync_obj);
2695 /* synchronize this object, non syncable objects return OK
2697 ret = gst_base_sink_do_sync (basesink, pad, sync_obj, &late, &step_end);
2698 if (G_UNLIKELY (ret != GST_FLOW_OK))
2701 /* and now render, event or buffer/buffer list. */
2702 if (G_LIKELY (is_list || GST_IS_BUFFER (obj))) {
2703 /* drop late buffers unconditionally, let's hope it's unlikely */
2704 if (G_UNLIKELY (late))
2707 bclass = GST_BASE_SINK_GET_CLASS (basesink);
2709 if (G_LIKELY ((is_list && bclass->render_list) ||
2710 (!is_list && bclass->render))) {
2713 /* read once, to get same value before and after */
2714 do_qos = g_atomic_int_get (&priv->qos_enabled);
2716 GST_DEBUG_OBJECT (basesink, "rendering object %p", obj);
2718 /* record rendering time for QoS and stats */
2720 gst_base_sink_do_render_stats (basesink, TRUE);
2725 /* For buffer lists do not set last buffer. Creating buffer
2726 * with meaningful data can be done only with memcpy which will
2727 * significantly affect performance */
2728 buf = GST_BUFFER_CAST (obj);
2729 gst_base_sink_set_last_buffer (basesink, buf);
2731 ret = bclass->render (basesink, buf);
2733 GstBufferList *buflist;
2735 buflist = GST_BUFFER_LIST_CAST (obj);
2737 ret = bclass->render_list (basesink, buflist);
2741 gst_base_sink_do_render_stats (basesink, FALSE);
2743 if (ret == GST_FLOW_STEP)
2746 if (G_UNLIKELY (basesink->flushing))
2752 GstEvent *event = GST_EVENT_CAST (obj);
2753 gboolean event_res = TRUE;
2756 bclass = GST_BASE_SINK_GET_CLASS (basesink);
2758 type = GST_EVENT_TYPE (event);
2760 GST_DEBUG_OBJECT (basesink, "rendering event %p, type %s", obj,
2761 gst_event_type_get_name (type));
2764 event_res = bclass->event (basesink, event);
2766 /* when we get here we could be flushing again when the event handler calls
2767 * _wait_eos(). We have to ignore this object in that case. */
2768 if (G_UNLIKELY (basesink->flushing))
2771 if (G_LIKELY (event_res)) {
2774 seqnum = basesink->priv->seqnum = gst_event_get_seqnum (event);
2775 GST_DEBUG_OBJECT (basesink, "Got seqnum #%" G_GUINT32_FORMAT, seqnum);
2780 GstMessage *message;
2782 /* the EOS event is completely handled so we mark
2783 * ourselves as being in the EOS state. eos is also
2784 * protected by the object lock so we can read it when
2785 * answering the POSITION query. */
2786 GST_OBJECT_LOCK (basesink);
2787 basesink->eos = TRUE;
2788 GST_OBJECT_UNLOCK (basesink);
2790 /* ok, now we can post the message */
2791 GST_DEBUG_OBJECT (basesink, "Now posting EOS");
2793 message = gst_message_new_eos (GST_OBJECT_CAST (basesink));
2794 gst_message_set_seqnum (message, seqnum);
2795 gst_element_post_message (GST_ELEMENT_CAST (basesink), message);
2798 case GST_EVENT_NEWSEGMENT:
2799 /* configure the segment */
2800 gst_base_sink_configure_segment (basesink, pad, event,
2801 &basesink->segment);
2803 case GST_EVENT_SINK_MESSAGE:{
2804 GstMessage *msg = NULL;
2806 gst_event_parse_sink_message (event, &msg);
2809 gst_element_post_message (GST_ELEMENT_CAST (basesink), msg);
2819 /* the step ended, check if we need to activate a new step */
2820 GST_DEBUG_OBJECT (basesink, "step ended");
2821 stop_stepping (basesink, &basesink->segment, &priv->current_step,
2822 priv->current_rstart, priv->current_rstop, basesink->eos);
2826 gst_base_sink_perform_qos (basesink, late);
2828 GST_DEBUG_OBJECT (basesink, "object unref after render %p", obj);
2829 gst_mini_object_unref (GST_MINI_OBJECT_CAST (obj));
2835 GST_DEBUG_OBJECT (basesink, "do_sync returned %s", gst_flow_get_name (ret));
2841 GST_DEBUG_OBJECT (basesink, "buffer late, dropping");
2843 if (g_atomic_int_get (&priv->qos_enabled)) {
2844 GstMessage *qos_msg;
2845 GstClockTime timestamp, duration;
2847 timestamp = GST_BUFFER_TIMESTAMP (GST_BUFFER_CAST (sync_obj));
2848 duration = GST_BUFFER_DURATION (GST_BUFFER_CAST (sync_obj));
2850 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, basesink,
2851 "qos: dropped buffer rt %" GST_TIME_FORMAT ", st %" GST_TIME_FORMAT
2852 ", ts %" GST_TIME_FORMAT ", dur %" GST_TIME_FORMAT,
2853 GST_TIME_ARGS (priv->current_rstart),
2854 GST_TIME_ARGS (priv->current_sstart), GST_TIME_ARGS (timestamp),
2855 GST_TIME_ARGS (duration));
2856 GST_CAT_DEBUG_OBJECT (GST_CAT_QOS, basesink,
2857 "qos: rendered %" G_GUINT64_FORMAT ", dropped %" G_GUINT64_FORMAT,
2858 priv->rendered, priv->dropped);
2861 gst_message_new_qos (GST_OBJECT_CAST (basesink), basesink->sync,
2862 priv->current_rstart, priv->current_sstart, timestamp, duration);
2863 gst_message_set_qos_values (qos_msg, priv->current_jitter, priv->avg_rate,
2865 gst_message_set_qos_stats (qos_msg, GST_FORMAT_BUFFERS, priv->rendered,
2867 gst_element_post_message (GST_ELEMENT_CAST (basesink), qos_msg);
2873 GST_DEBUG_OBJECT (basesink, "we are flushing, ignore object");
2874 gst_mini_object_unref (obj);
2875 return GST_FLOW_WRONG_STATE;
2879 /* with STREAM_LOCK, PREROLL_LOCK
2881 * Perform preroll on the given object. For buffers this means
2882 * calling the preroll subclass method.
2883 * If that succeeds, the state will be commited.
2885 * function does not take ownership of obj.
2887 static GstFlowReturn
2888 gst_base_sink_preroll_object (GstBaseSink * basesink, gboolean is_list,
2889 GstMiniObject * obj)
2893 GST_DEBUG_OBJECT (basesink, "prerolling object %p", obj);
2895 /* if it's a buffer, we need to call the preroll method */
2896 if (G_LIKELY (is_list || GST_IS_BUFFER (obj)) && basesink->priv->call_preroll) {
2897 GstBaseSinkClass *bclass;
2899 GstClockTime timestamp;
2902 buf = gst_buffer_list_get (GST_BUFFER_LIST_CAST (obj), 0, 0);
2903 g_assert (NULL != buf);
2905 buf = GST_BUFFER_CAST (obj);
2908 timestamp = GST_BUFFER_TIMESTAMP (buf);
2910 GST_DEBUG_OBJECT (basesink, "preroll buffer %" GST_TIME_FORMAT,
2911 GST_TIME_ARGS (timestamp));
2914 * For buffer lists do not set last buffer. Creating buffer
2915 * with meaningful data can be done only with memcpy which will
2916 * significantly affect performance
2919 gst_base_sink_set_last_buffer (basesink, buf);
2922 bclass = GST_BASE_SINK_GET_CLASS (basesink);
2923 if (bclass->preroll)
2924 if ((ret = bclass->preroll (basesink, buf)) != GST_FLOW_OK)
2925 goto preroll_failed;
2927 basesink->priv->call_preroll = FALSE;
2931 if (G_LIKELY (basesink->playing_async)) {
2932 if (G_UNLIKELY (!gst_base_sink_commit_state (basesink)))
2941 GST_DEBUG_OBJECT (basesink, "preroll failed, abort state");
2942 gst_element_abort_state (GST_ELEMENT_CAST (basesink));
2947 GST_DEBUG_OBJECT (basesink, "stopping while commiting state");
2948 return GST_FLOW_WRONG_STATE;
2952 /* with STREAM_LOCK, PREROLL_LOCK
2954 * Queue an object for rendering.
2955 * The first prerollable object queued will complete the preroll. If the
2956 * preroll queue if filled, we render all the objects in the queue.
2958 * This function takes ownership of the object.
2960 static GstFlowReturn
2961 gst_base_sink_queue_object_unlocked (GstBaseSink * basesink, GstPad * pad,
2962 gboolean is_list, gpointer obj, gboolean prerollable)
2964 GstFlowReturn ret = GST_FLOW_OK;
2968 if (G_UNLIKELY (basesink->need_preroll)) {
2969 if (G_LIKELY (prerollable))
2970 basesink->preroll_queued++;
2972 length = basesink->preroll_queued;
2974 GST_DEBUG_OBJECT (basesink, "now %d prerolled items", length);
2976 /* first prerollable item needs to finish the preroll */
2978 ret = gst_base_sink_preroll_object (basesink, is_list, obj);
2979 if (G_UNLIKELY (ret != GST_FLOW_OK))
2980 goto preroll_failed;
2982 /* need to recheck if we need preroll, commmit state during preroll
2983 * could have made us not need more preroll. */
2984 if (G_UNLIKELY (basesink->need_preroll)) {
2985 /* see if we can render now, if we can't add the object to the preroll
2987 if (G_UNLIKELY (length <= basesink->preroll_queue_max_len))
2991 /* we can start rendering (or blocking) the queued object
2993 q = basesink->preroll_queue;
2994 while (G_UNLIKELY (!g_queue_is_empty (q))) {
2997 o = g_queue_pop_head (q);
2998 GST_DEBUG_OBJECT (basesink, "rendering queued object %p", o);
3000 /* do something with the return value */
3001 ret = gst_base_sink_render_object (basesink, pad, FALSE, o);
3002 if (ret != GST_FLOW_OK)
3003 goto dequeue_failed;
3006 /* now render the object */
3007 ret = gst_base_sink_render_object (basesink, pad, is_list, obj);
3008 basesink->preroll_queued = 0;
3015 GST_DEBUG_OBJECT (basesink, "preroll failed, reason %s",
3016 gst_flow_get_name (ret));
3017 gst_mini_object_unref (GST_MINI_OBJECT_CAST (obj));
3022 /* add object to the queue and return */
3023 GST_DEBUG_OBJECT (basesink, "need more preroll data %d <= %d",
3024 length, basesink->preroll_queue_max_len);
3025 g_queue_push_tail (basesink->preroll_queue, obj);
3030 GST_DEBUG_OBJECT (basesink, "rendering queued objects failed, reason %s",
3031 gst_flow_get_name (ret));
3032 gst_mini_object_unref (GST_MINI_OBJECT_CAST (obj));
3039 * This function grabs the PREROLL_LOCK and adds the object to
3042 * This function takes ownership of obj.
3044 static GstFlowReturn
3045 gst_base_sink_queue_object (GstBaseSink * basesink, GstPad * pad,
3046 GstMiniObject * obj, gboolean prerollable)
3050 GST_PAD_PREROLL_LOCK (pad);
3051 if (G_UNLIKELY (basesink->flushing))
3054 if (G_UNLIKELY (basesink->priv->received_eos))
3058 gst_base_sink_queue_object_unlocked (basesink, pad, FALSE, obj,
3060 GST_PAD_PREROLL_UNLOCK (pad);
3067 GST_DEBUG_OBJECT (basesink, "sink is flushing");
3068 GST_PAD_PREROLL_UNLOCK (pad);
3069 gst_mini_object_unref (obj);
3070 return GST_FLOW_WRONG_STATE;
3074 GST_DEBUG_OBJECT (basesink,
3075 "we are EOS, dropping object, return UNEXPECTED");
3076 GST_PAD_PREROLL_UNLOCK (pad);
3077 gst_mini_object_unref (obj);
3078 return GST_FLOW_UNEXPECTED;
3083 gst_base_sink_flush_start (GstBaseSink * basesink, GstPad * pad)
3085 /* make sure we are not blocked on the clock also clear any pending
3087 gst_base_sink_set_flushing (basesink, pad, TRUE);
3089 /* we grab the stream lock but that is not needed since setting the
3090 * sink to flushing would make sure no state commit is being done
3092 GST_PAD_STREAM_LOCK (pad);
3093 gst_base_sink_reset_qos (basesink);
3094 if (basesink->priv->async_enabled) {
3095 /* and we need to commit our state again on the next
3096 * prerolled buffer */
3097 basesink->playing_async = TRUE;
3098 gst_element_lost_state (GST_ELEMENT_CAST (basesink));
3100 basesink->priv->have_latency = TRUE;
3101 basesink->need_preroll = FALSE;
3103 gst_base_sink_set_last_buffer (basesink, NULL);
3104 GST_PAD_STREAM_UNLOCK (pad);
3108 gst_base_sink_flush_stop (GstBaseSink * basesink, GstPad * pad)
3110 /* unset flushing so we can accept new data, this also flushes out any EOS
3112 gst_base_sink_set_flushing (basesink, pad, FALSE);
3114 /* for position reporting */
3115 GST_OBJECT_LOCK (basesink);
3116 basesink->priv->current_sstart = GST_CLOCK_TIME_NONE;
3117 basesink->priv->current_sstop = GST_CLOCK_TIME_NONE;
3118 basesink->priv->eos_rtime = GST_CLOCK_TIME_NONE;
3119 basesink->priv->call_preroll = TRUE;
3120 basesink->priv->current_step.valid = FALSE;
3121 basesink->priv->pending_step.valid = FALSE;
3122 if (basesink->pad_mode == GST_ACTIVATE_PUSH) {
3123 /* we need new segment info after the flush. */
3124 basesink->have_newsegment = FALSE;
3125 gst_segment_init (&basesink->segment, GST_FORMAT_UNDEFINED);
3126 gst_segment_init (basesink->abidata.ABI.clip_segment, GST_FORMAT_UNDEFINED);
3128 GST_OBJECT_UNLOCK (basesink);
3132 gst_base_sink_event (GstPad * pad, GstEvent * event)
3134 GstBaseSink *basesink;
3135 gboolean result = TRUE;
3136 GstBaseSinkClass *bclass;
3138 basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
3140 bclass = GST_BASE_SINK_GET_CLASS (basesink);
3142 GST_DEBUG_OBJECT (basesink, "event %p (%s)", event,
3143 GST_EVENT_TYPE_NAME (event));
3145 switch (GST_EVENT_TYPE (event)) {
3150 GST_PAD_PREROLL_LOCK (pad);
3151 if (G_UNLIKELY (basesink->flushing))
3154 if (G_UNLIKELY (basesink->priv->received_eos)) {
3155 /* we can't accept anything when we are EOS */
3157 gst_event_unref (event);
3159 /* we set the received EOS flag here so that we can use it when testing if
3160 * we are prerolled and to refuse more buffers. */
3161 basesink->priv->received_eos = TRUE;
3163 /* EOS is a prerollable object, we call the unlocked version because it
3164 * does not check the received_eos flag. */
3165 ret = gst_base_sink_queue_object_unlocked (basesink, pad,
3166 FALSE, GST_MINI_OBJECT_CAST (event), TRUE);
3167 if (G_UNLIKELY (ret != GST_FLOW_OK))
3170 GST_PAD_PREROLL_UNLOCK (pad);
3173 case GST_EVENT_NEWSEGMENT:
3178 GST_DEBUG_OBJECT (basesink, "newsegment %p", event);
3180 GST_PAD_PREROLL_LOCK (pad);
3181 if (G_UNLIKELY (basesink->flushing))
3184 gst_event_parse_new_segment_full (event, &update, NULL, NULL, NULL, NULL,
3187 if (G_UNLIKELY (basesink->priv->received_eos && !update)) {
3188 /* we can't accept anything when we are EOS */
3190 gst_event_unref (event);
3192 /* the new segment is a non prerollable item and does not block anything,
3193 * we need to configure the current clipping segment and insert the event
3194 * in the queue to serialize it with the buffers for rendering. */
3195 gst_base_sink_configure_segment (basesink, pad, event,
3196 basesink->abidata.ABI.clip_segment);
3199 gst_base_sink_queue_object_unlocked (basesink, pad,
3200 FALSE, GST_MINI_OBJECT_CAST (event), FALSE);
3201 if (G_UNLIKELY (ret != GST_FLOW_OK))
3204 GST_OBJECT_LOCK (basesink);
3205 basesink->have_newsegment = TRUE;
3206 GST_OBJECT_UNLOCK (basesink);
3209 GST_PAD_PREROLL_UNLOCK (pad);
3212 case GST_EVENT_FLUSH_START:
3214 bclass->event (basesink, event);
3216 GST_DEBUG_OBJECT (basesink, "flush-start %p", event);
3218 gst_base_sink_flush_start (basesink, pad);
3220 gst_event_unref (event);
3222 case GST_EVENT_FLUSH_STOP:
3224 bclass->event (basesink, event);
3226 GST_DEBUG_OBJECT (basesink, "flush-stop %p", event);
3228 gst_base_sink_flush_stop (basesink, pad);
3230 gst_event_unref (event);
3233 /* other events are sent to queue or subclass depending on if they
3234 * are serialized. */
3235 if (GST_EVENT_IS_SERIALIZED (event)) {
3236 gst_base_sink_queue_object (basesink, pad,
3237 GST_MINI_OBJECT_CAST (event), FALSE);
3240 bclass->event (basesink, event);
3241 gst_event_unref (event);
3246 gst_object_unref (basesink);
3253 GST_DEBUG_OBJECT (basesink, "we are flushing");
3254 GST_PAD_PREROLL_UNLOCK (pad);
3256 gst_event_unref (event);
3261 /* default implementation to calculate the start and end
3262 * timestamps on a buffer, subclasses can override
3265 gst_base_sink_get_times (GstBaseSink * basesink, GstBuffer * buffer,
3266 GstClockTime * start, GstClockTime * end)
3268 GstClockTime timestamp, duration;
3270 timestamp = GST_BUFFER_TIMESTAMP (buffer);
3271 if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
3273 /* get duration to calculate end time */
3274 duration = GST_BUFFER_DURATION (buffer);
3275 if (GST_CLOCK_TIME_IS_VALID (duration)) {
3276 *end = timestamp + duration;
3282 /* must be called with PREROLL_LOCK */
3284 gst_base_sink_needs_preroll (GstBaseSink * basesink)
3286 gboolean is_prerolled, res;
3288 /* we have 2 cases where the PREROLL_LOCK is released:
3289 * 1) we are blocking in the PREROLL_LOCK and thus are prerolled.
3290 * 2) we are syncing on the clock
3292 is_prerolled = basesink->have_preroll || basesink->priv->received_eos;
3293 res = !is_prerolled;
3295 GST_DEBUG_OBJECT (basesink, "have_preroll: %d, EOS: %d => needs preroll: %d",
3296 basesink->have_preroll, basesink->priv->received_eos, res);
3301 /* with STREAM_LOCK, PREROLL_LOCK
3303 * Takes a buffer and compare the timestamps with the last segment.
3304 * If the buffer falls outside of the segment boundaries, drop it.
3305 * Else queue the buffer for preroll and rendering.
3307 * This function takes ownership of the buffer.
3309 static GstFlowReturn
3310 gst_base_sink_chain_unlocked (GstBaseSink * basesink, GstPad * pad,
3311 gboolean is_list, gpointer obj)
3313 GstBaseSinkClass *bclass;
3314 GstFlowReturn result;
3315 GstClockTime start = GST_CLOCK_TIME_NONE, end = GST_CLOCK_TIME_NONE;
3316 GstSegment *clip_segment;
3317 GstBuffer *time_buf;
3319 if (G_UNLIKELY (basesink->flushing))
3322 if (G_UNLIKELY (basesink->priv->received_eos))
3326 time_buf = gst_buffer_list_get (GST_BUFFER_LIST_CAST (obj), 0, 0);
3327 g_assert (NULL != time_buf);
3329 time_buf = GST_BUFFER_CAST (obj);
3332 /* for code clarity */
3333 clip_segment = basesink->abidata.ABI.clip_segment;
3335 if (G_UNLIKELY (!basesink->have_newsegment)) {
3338 sync = gst_base_sink_get_sync (basesink);
3340 GST_ELEMENT_WARNING (basesink, STREAM, FAILED,
3341 (_("Internal data flow problem.")),
3342 ("Received buffer without a new-segment. Assuming timestamps start from 0."));
3345 /* this means this sink will assume timestamps start from 0 */
3346 GST_OBJECT_LOCK (basesink);
3347 clip_segment->start = 0;
3348 clip_segment->stop = -1;
3349 basesink->segment.start = 0;
3350 basesink->segment.stop = -1;
3351 basesink->have_newsegment = TRUE;
3352 GST_OBJECT_UNLOCK (basesink);
3355 bclass = GST_BASE_SINK_GET_CLASS (basesink);
3357 /* check if the buffer needs to be dropped, we first ask the subclass for the
3359 if (bclass->get_times)
3360 bclass->get_times (basesink, time_buf, &start, &end);
3362 if (!GST_CLOCK_TIME_IS_VALID (start)) {
3363 /* if the subclass does not want sync, we use our own values so that we at
3364 * least clip the buffer to the segment */
3365 gst_base_sink_get_times (basesink, time_buf, &start, &end);
3368 GST_DEBUG_OBJECT (basesink, "got times start: %" GST_TIME_FORMAT
3369 ", end: %" GST_TIME_FORMAT, GST_TIME_ARGS (start), GST_TIME_ARGS (end));
3371 /* a dropped buffer does not participate in anything */
3372 if (GST_CLOCK_TIME_IS_VALID (start) &&
3373 (clip_segment->format == GST_FORMAT_TIME)) {
3374 if (G_UNLIKELY (!gst_segment_clip (clip_segment,
3375 GST_FORMAT_TIME, (gint64) start, (gint64) end, NULL, NULL)))
3376 goto out_of_segment;
3379 /* now we can process the buffer in the queue, this function takes ownership
3381 result = gst_base_sink_queue_object_unlocked (basesink, pad,
3382 is_list, obj, TRUE);
3388 GST_DEBUG_OBJECT (basesink, "sink is flushing");
3389 gst_mini_object_unref (GST_MINI_OBJECT_CAST (obj));
3390 return GST_FLOW_WRONG_STATE;
3394 GST_DEBUG_OBJECT (basesink,
3395 "we are EOS, dropping object, return UNEXPECTED");
3396 gst_mini_object_unref (GST_MINI_OBJECT_CAST (obj));
3397 return GST_FLOW_UNEXPECTED;
3401 GST_DEBUG_OBJECT (basesink, "dropping buffer, out of clipping segment");
3402 gst_mini_object_unref (GST_MINI_OBJECT_CAST (obj));
3409 static GstFlowReturn
3410 gst_base_sink_chain_main (GstBaseSink * basesink, GstPad * pad,
3411 gboolean is_list, gpointer obj)
3413 GstFlowReturn result;
3415 if (G_UNLIKELY (basesink->pad_mode != GST_ACTIVATE_PUSH))
3418 GST_PAD_PREROLL_LOCK (pad);
3419 result = gst_base_sink_chain_unlocked (basesink, pad, is_list, obj);
3420 GST_PAD_PREROLL_UNLOCK (pad);
3428 GST_OBJECT_LOCK (pad);
3429 GST_WARNING_OBJECT (basesink,
3430 "Push on pad %s:%s, but it was not activated in push mode",
3431 GST_DEBUG_PAD_NAME (pad));
3432 GST_OBJECT_UNLOCK (pad);
3433 gst_mini_object_unref (GST_MINI_OBJECT_CAST (obj));
3434 /* we don't post an error message this will signal to the peer
3435 * pushing that EOS is reached. */
3436 result = GST_FLOW_UNEXPECTED;
3441 static GstFlowReturn
3442 gst_base_sink_chain (GstPad * pad, GstBuffer * buf)
3444 GstBaseSink *basesink;
3446 basesink = GST_BASE_SINK (GST_OBJECT_PARENT (pad));
3448 return gst_base_sink_chain_main (basesink, pad, FALSE, buf);
3451 static GstFlowReturn
3452 gst_base_sink_chain_list (GstPad * pad, GstBufferList * list)
3454 GstBaseSink *basesink;
3455 GstBaseSinkClass *bclass;
3456 GstFlowReturn result;
3458 basesink = GST_BASE_SINK (GST_OBJECT_PARENT (pad));
3459 bclass = GST_BASE_SINK_GET_CLASS (basesink);
3461 if (G_LIKELY (bclass->render_list)) {
3462 result = gst_base_sink_chain_main (basesink, pad, TRUE, list);
3464 GstBufferListIterator *it;
3467 GST_INFO_OBJECT (pad, "chaining each group in list as a merged buffer");
3469 it = gst_buffer_list_iterate (list);
3471 if (gst_buffer_list_iterator_next_group (it)) {
3473 group = gst_buffer_list_iterator_merge_group (it);
3474 if (group == NULL) {
3475 group = gst_buffer_new ();
3476 GST_CAT_INFO_OBJECT (GST_CAT_SCHEDULING, pad, "chaining empty group");
3478 GST_CAT_INFO_OBJECT (GST_CAT_SCHEDULING, pad, "chaining group");
3480 result = gst_base_sink_chain_main (basesink, pad, FALSE, group);
3481 } while (result == GST_FLOW_OK
3482 && gst_buffer_list_iterator_next_group (it));
3484 GST_CAT_INFO_OBJECT (GST_CAT_SCHEDULING, pad, "chaining empty group");
3486 gst_base_sink_chain_main (basesink, pad, FALSE, gst_buffer_new ());
3488 gst_buffer_list_iterator_free (it);
3489 gst_buffer_list_unref (list);
3496 gst_base_sink_default_do_seek (GstBaseSink * sink, GstSegment * segment)
3498 gboolean res = TRUE;
3500 /* update our offset if the start/stop position was updated */
3501 if (segment->format == GST_FORMAT_BYTES) {
3502 segment->time = segment->start;
3503 } else if (segment->start == 0) {
3504 /* seek to start, we can implement a default for this. */
3508 GST_INFO_OBJECT (sink, "Can't do a default seek");
3514 #define SEEK_TYPE_IS_RELATIVE(t) (((t) != GST_SEEK_TYPE_NONE) && ((t) != GST_SEEK_TYPE_SET))
3517 gst_base_sink_default_prepare_seek_segment (GstBaseSink * sink,
3518 GstEvent * event, GstSegment * segment)
3520 /* By default, we try one of 2 things:
3521 * - For absolute seek positions, convert the requested position to our
3522 * configured processing format and place it in the output segment \
3523 * - For relative seek positions, convert our current (input) values to the
3524 * seek format, adjust by the relative seek offset and then convert back to
3525 * the processing format
3527 GstSeekType cur_type, stop_type;
3530 GstFormat seek_format, dest_format;
3533 gboolean res = TRUE;
3535 gst_event_parse_seek (event, &rate, &seek_format, &flags,
3536 &cur_type, &cur, &stop_type, &stop);
3537 dest_format = segment->format;
3539 if (seek_format == dest_format) {
3540 gst_segment_set_seek (segment, rate, seek_format, flags,
3541 cur_type, cur, stop_type, stop, &update);
3545 if (cur_type != GST_SEEK_TYPE_NONE) {
3546 /* FIXME: Handle seek_cur & seek_end by converting the input segment vals */
3548 gst_pad_query_convert (sink->sinkpad, seek_format, cur, &dest_format,
3550 cur_type = GST_SEEK_TYPE_SET;
3553 if (res && stop_type != GST_SEEK_TYPE_NONE) {
3554 /* FIXME: Handle seek_cur & seek_end by converting the input segment vals */
3556 gst_pad_query_convert (sink->sinkpad, seek_format, stop, &dest_format,
3558 stop_type = GST_SEEK_TYPE_SET;
3561 /* And finally, configure our output segment in the desired format */
3562 gst_segment_set_seek (segment, rate, dest_format, flags, cur_type, cur,
3563 stop_type, stop, &update);
3572 GST_DEBUG_OBJECT (sink, "undefined format given, seek aborted.");
3577 /* perform a seek, only executed in pull mode */
3579 gst_base_sink_perform_seek (GstBaseSink * sink, GstPad * pad, GstEvent * event)
3583 GstFormat seek_format, dest_format;
3585 GstSeekType cur_type, stop_type;
3586 gboolean seekseg_configured = FALSE;
3588 gboolean update, res = TRUE;
3589 GstSegment seeksegment;
3591 dest_format = sink->segment.format;
3594 GST_DEBUG_OBJECT (sink, "performing seek with event %p", event);
3595 gst_event_parse_seek (event, &rate, &seek_format, &flags,
3596 &cur_type, &cur, &stop_type, &stop);
3598 flush = flags & GST_SEEK_FLAG_FLUSH;
3600 GST_DEBUG_OBJECT (sink, "performing seek without event");
3605 GST_DEBUG_OBJECT (sink, "flushing upstream");
3606 gst_pad_push_event (pad, gst_event_new_flush_start ());
3607 gst_base_sink_flush_start (sink, pad);
3609 GST_DEBUG_OBJECT (sink, "pausing pulling thread");
3612 GST_PAD_STREAM_LOCK (pad);
3614 /* If we configured the seeksegment above, don't overwrite it now. Otherwise
3615 * copy the current segment info into the temp segment that we can actually
3616 * attempt the seek with. We only update the real segment if the seek suceeds. */
3617 if (!seekseg_configured) {
3618 memcpy (&seeksegment, &sink->segment, sizeof (GstSegment));
3620 /* now configure the final seek segment */
3622 if (sink->segment.format != seek_format) {
3623 /* OK, here's where we give the subclass a chance to convert the relative
3624 * seek into an absolute one in the processing format. We set up any
3625 * absolute seek above, before taking the stream lock. */
3626 if (!gst_base_sink_default_prepare_seek_segment (sink, event,
3628 GST_DEBUG_OBJECT (sink,
3629 "Preparing the seek failed after flushing. " "Aborting seek");
3633 /* The seek format matches our processing format, no need to ask the
3634 * the subclass to configure the segment. */
3635 gst_segment_set_seek (&seeksegment, rate, seek_format, flags,
3636 cur_type, cur, stop_type, stop, &update);
3639 /* Else, no seek event passed, so we're just (re)starting the
3644 GST_DEBUG_OBJECT (sink, "segment configured from %" G_GINT64_FORMAT
3645 " to %" G_GINT64_FORMAT ", position %" G_GINT64_FORMAT,
3646 seeksegment.start, seeksegment.stop, seeksegment.last_stop);
3648 /* do the seek, segment.last_stop contains the new position. */
3649 res = gst_base_sink_default_do_seek (sink, &seeksegment);
3654 GST_DEBUG_OBJECT (sink, "stop flushing upstream");
3655 gst_pad_push_event (pad, gst_event_new_flush_stop ());
3656 gst_base_sink_flush_stop (sink, pad);
3657 } else if (res && sink->abidata.ABI.running) {
3658 /* we are running the current segment and doing a non-flushing seek,
3659 * close the segment first based on the last_stop. */
3660 GST_DEBUG_OBJECT (sink, "closing running segment %" G_GINT64_FORMAT
3661 " to %" G_GINT64_FORMAT, sink->segment.start, sink->segment.last_stop);
3664 /* The subclass must have converted the segment to the processing format
3666 if (res && seeksegment.format != dest_format) {
3667 GST_DEBUG_OBJECT (sink, "Subclass failed to prepare a seek segment "
3668 "in the correct format. Aborting seek.");
3672 /* if successfull seek, we update our real segment and push
3673 * out the new segment. */
3675 memcpy (&sink->segment, &seeksegment, sizeof (GstSegment));
3677 if (sink->segment.flags & GST_SEEK_FLAG_SEGMENT) {
3678 gst_element_post_message (GST_ELEMENT (sink),
3679 gst_message_new_segment_start (GST_OBJECT (sink),
3680 sink->segment.format, sink->segment.last_stop));
3684 sink->priv->discont = TRUE;
3685 sink->abidata.ABI.running = TRUE;
3687 GST_PAD_STREAM_UNLOCK (pad);
3693 set_step_info (GstBaseSink * sink, GstStepInfo * current, GstStepInfo * pending,
3694 guint seqnum, GstFormat format, guint64 amount, gdouble rate,
3695 gboolean flush, gboolean intermediate)
3697 GST_OBJECT_LOCK (sink);
3698 pending->seqnum = seqnum;
3699 pending->format = format;
3700 pending->amount = amount;
3701 pending->position = 0;
3702 pending->rate = rate;
3703 pending->flush = flush;
3704 pending->intermediate = intermediate;
3705 pending->valid = TRUE;
3706 /* flush invalidates the current stepping segment */
3708 current->valid = FALSE;
3709 GST_OBJECT_UNLOCK (sink);
3713 gst_base_sink_perform_step (GstBaseSink * sink, GstPad * pad, GstEvent * event)
3715 GstBaseSinkPrivate *priv;
3716 GstBaseSinkClass *bclass;
3717 gboolean flush, intermediate;
3722 GstStepInfo *pending, *current;
3723 GstMessage *message;
3725 bclass = GST_BASE_SINK_GET_CLASS (sink);
3728 GST_DEBUG_OBJECT (sink, "performing step with event %p", event);
3730 gst_event_parse_step (event, &format, &amount, &rate, &flush, &intermediate);
3731 seqnum = gst_event_get_seqnum (event);
3733 pending = &priv->pending_step;
3734 current = &priv->current_step;
3736 /* post message first */
3737 message = gst_message_new_step_start (GST_OBJECT (sink), FALSE, format,
3738 amount, rate, flush, intermediate);
3739 gst_message_set_seqnum (message, seqnum);
3740 gst_element_post_message (GST_ELEMENT (sink), message);
3743 /* we need to call ::unlock before locking PREROLL_LOCK
3744 * since we lock it before going into ::render */
3746 bclass->unlock (sink);
3748 GST_PAD_PREROLL_LOCK (sink->sinkpad);
3749 /* now that we have the PREROLL lock, clear our unlock request */
3750 if (bclass->unlock_stop)
3751 bclass->unlock_stop (sink);
3753 /* update the stepinfo and make it valid */
3754 set_step_info (sink, current, pending, seqnum, format, amount, rate, flush,
3757 if (sink->priv->async_enabled) {
3758 /* and we need to commit our state again on the next
3759 * prerolled buffer */
3760 sink->playing_async = TRUE;
3761 priv->pending_step.need_preroll = TRUE;
3762 sink->need_preroll = FALSE;
3763 gst_element_lost_state_full (GST_ELEMENT_CAST (sink), FALSE);
3765 sink->priv->have_latency = TRUE;
3766 sink->need_preroll = FALSE;
3768 priv->current_sstart = GST_CLOCK_TIME_NONE;
3769 priv->current_sstop = GST_CLOCK_TIME_NONE;
3770 priv->eos_rtime = GST_CLOCK_TIME_NONE;
3771 priv->call_preroll = TRUE;
3772 gst_base_sink_set_last_buffer (sink, NULL);
3773 gst_base_sink_reset_qos (sink);
3775 if (sink->clock_id) {
3776 gst_clock_id_unschedule (sink->clock_id);
3779 if (sink->have_preroll) {
3780 GST_DEBUG_OBJECT (sink, "signal waiter");
3781 priv->step_unlock = TRUE;
3782 GST_PAD_PREROLL_SIGNAL (sink->sinkpad);
3784 GST_PAD_PREROLL_UNLOCK (sink->sinkpad);
3786 /* update the stepinfo and make it valid */
3787 set_step_info (sink, current, pending, seqnum, format, amount, rate, flush,
3797 gst_base_sink_loop (GstPad * pad)
3799 GstBaseSink *basesink;
3800 GstBuffer *buf = NULL;
3801 GstFlowReturn result;
3805 basesink = GST_BASE_SINK (GST_OBJECT_PARENT (pad));
3807 g_assert (basesink->pad_mode == GST_ACTIVATE_PULL);
3809 if ((blocksize = basesink->priv->blocksize) == 0)
3812 offset = basesink->segment.last_stop;
3814 GST_DEBUG_OBJECT (basesink, "pulling %" G_GUINT64_FORMAT ", %u",
3817 result = gst_pad_pull_range (pad, offset, blocksize, &buf);
3818 if (G_UNLIKELY (result != GST_FLOW_OK))
3821 if (G_UNLIKELY (buf == NULL))
3824 offset += GST_BUFFER_SIZE (buf);
3826 gst_segment_set_last_stop (&basesink->segment, GST_FORMAT_BYTES, offset);
3828 GST_PAD_PREROLL_LOCK (pad);
3829 result = gst_base_sink_chain_unlocked (basesink, pad, FALSE, buf);
3830 GST_PAD_PREROLL_UNLOCK (pad);
3831 if (G_UNLIKELY (result != GST_FLOW_OK))
3839 GST_LOG_OBJECT (basesink, "pausing task, reason %s",
3840 gst_flow_get_name (result));
3841 gst_pad_pause_task (pad);
3842 /* fatal errors and NOT_LINKED cause EOS */
3843 if (GST_FLOW_IS_FATAL (result) || result == GST_FLOW_NOT_LINKED) {
3844 if (result == GST_FLOW_UNEXPECTED) {
3845 /* perform EOS logic */
3846 if (basesink->segment.flags & GST_SEEK_FLAG_SEGMENT) {
3847 gst_element_post_message (GST_ELEMENT_CAST (basesink),
3848 gst_message_new_segment_done (GST_OBJECT_CAST (basesink),
3849 basesink->segment.format, basesink->segment.last_stop));
3851 gst_base_sink_event (pad, gst_event_new_eos ());
3854 /* for fatal errors we post an error message, post the error
3855 * first so the app knows about the error first. */
3856 GST_ELEMENT_ERROR (basesink, STREAM, FAILED,
3857 (_("Internal data stream error.")),
3858 ("stream stopped, reason %s", gst_flow_get_name (result)));
3859 gst_base_sink_event (pad, gst_event_new_eos ());
3866 GST_LOG_OBJECT (basesink, "no buffer, pausing");
3867 GST_ELEMENT_ERROR (basesink, STREAM, FAILED,
3868 (_("Internal data flow error.")), ("element returned NULL buffer"));
3869 result = GST_FLOW_ERROR;
3875 gst_base_sink_set_flushing (GstBaseSink * basesink, GstPad * pad,
3878 GstBaseSinkClass *bclass;
3880 bclass = GST_BASE_SINK_GET_CLASS (basesink);
3883 /* unlock any subclasses, we need to do this before grabbing the
3884 * PREROLL_LOCK since we hold this lock before going into ::render. */
3886 bclass->unlock (basesink);
3889 GST_PAD_PREROLL_LOCK (pad);
3890 basesink->flushing = flushing;
3892 /* step 1, now that we have the PREROLL lock, clear our unlock request */
3893 if (bclass->unlock_stop)
3894 bclass->unlock_stop (basesink);
3896 /* set need_preroll before we unblock the clock. If the clock is unblocked
3897 * before timing out, we can reuse the buffer for preroll. */
3898 basesink->need_preroll = TRUE;
3900 /* step 2, unblock clock sync (if any) or any other blocking thing */
3901 if (basesink->clock_id) {
3902 gst_clock_id_unschedule (basesink->clock_id);
3905 /* flush out the data thread if it's locked in finish_preroll, this will
3906 * also flush out the EOS state */
3907 GST_DEBUG_OBJECT (basesink,
3908 "flushing out data thread, need preroll to TRUE");
3909 gst_base_sink_preroll_queue_flush (basesink, pad);
3911 GST_PAD_PREROLL_UNLOCK (pad);
3917 gst_base_sink_default_activate_pull (GstBaseSink * basesink, gboolean active)
3923 result = gst_pad_start_task (basesink->sinkpad,
3924 (GstTaskFunction) gst_base_sink_loop, basesink->sinkpad);
3926 /* step 2, make sure streaming finishes */
3927 result = gst_pad_stop_task (basesink->sinkpad);
3934 gst_base_sink_pad_activate (GstPad * pad)
3936 gboolean result = FALSE;
3937 GstBaseSink *basesink;
3939 basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
3941 GST_DEBUG_OBJECT (basesink, "Trying pull mode first");
3943 gst_base_sink_set_flushing (basesink, pad, FALSE);
3945 /* we need to have the pull mode enabled */
3946 if (!basesink->can_activate_pull) {
3947 GST_DEBUG_OBJECT (basesink, "pull mode disabled");
3951 /* check if downstreams supports pull mode at all */
3952 if (!gst_pad_check_pull_range (pad)) {
3953 GST_DEBUG_OBJECT (basesink, "pull mode not supported");
3957 /* set the pad mode before starting the task so that it's in the
3958 * correct state for the new thread. also the sink set_caps and get_caps
3959 * function checks this */
3960 basesink->pad_mode = GST_ACTIVATE_PULL;
3962 /* we first try to negotiate a format so that when we try to activate
3963 * downstream, it knows about our format */
3964 if (!gst_base_sink_negotiate_pull (basesink)) {
3965 GST_DEBUG_OBJECT (basesink, "failed to negotiate in pull mode");
3969 /* ok activate now */
3970 if (!gst_pad_activate_pull (pad, TRUE)) {
3971 /* clear any pending caps */
3972 GST_OBJECT_LOCK (basesink);
3973 gst_caps_replace (&basesink->priv->pull_caps, NULL);
3974 GST_OBJECT_UNLOCK (basesink);
3975 GST_DEBUG_OBJECT (basesink, "failed to activate in pull mode");
3979 GST_DEBUG_OBJECT (basesink, "Success activating pull mode");
3983 /* push mode fallback */
3985 GST_DEBUG_OBJECT (basesink, "Falling back to push mode");
3986 if ((result = gst_pad_activate_push (pad, TRUE))) {
3987 GST_DEBUG_OBJECT (basesink, "Success activating push mode");
3992 GST_WARNING_OBJECT (basesink, "Could not activate pad in either mode");
3993 gst_base_sink_set_flushing (basesink, pad, TRUE);
3996 gst_object_unref (basesink);
4002 gst_base_sink_pad_activate_push (GstPad * pad, gboolean active)
4005 GstBaseSink *basesink;
4007 basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
4010 if (!basesink->can_activate_push) {
4012 basesink->pad_mode = GST_ACTIVATE_NONE;
4015 basesink->pad_mode = GST_ACTIVATE_PUSH;
4018 if (G_UNLIKELY (basesink->pad_mode != GST_ACTIVATE_PUSH)) {
4019 g_warning ("Internal GStreamer activation error!!!");
4022 gst_base_sink_set_flushing (basesink, pad, TRUE);
4024 basesink->pad_mode = GST_ACTIVATE_NONE;
4028 gst_object_unref (basesink);
4034 gst_base_sink_negotiate_pull (GstBaseSink * basesink)
4041 /* this returns the intersection between our caps and the peer caps. If there
4042 * is no peer, it returns NULL and we can't operate in pull mode so we can
4043 * fail the negotiation. */
4044 caps = gst_pad_get_allowed_caps (GST_BASE_SINK_PAD (basesink));
4045 if (caps == NULL || gst_caps_is_empty (caps))
4046 goto no_caps_possible;
4048 GST_DEBUG_OBJECT (basesink, "allowed caps: %" GST_PTR_FORMAT, caps);
4050 caps = gst_caps_make_writable (caps);
4051 /* get the first (prefered) format */
4052 gst_caps_truncate (caps);
4054 gst_pad_fixate_caps (GST_BASE_SINK_PAD (basesink), caps);
4056 GST_DEBUG_OBJECT (basesink, "fixated to: %" GST_PTR_FORMAT, caps);
4058 if (gst_caps_is_any (caps)) {
4059 GST_DEBUG_OBJECT (basesink, "caps were ANY after fixating, "
4061 /* neither side has template caps in this case, so they are prepared for
4062 pull() without setcaps() */
4064 } else if (gst_caps_is_fixed (caps)) {
4065 if (!gst_pad_set_caps (GST_BASE_SINK_PAD (basesink), caps))
4066 goto could_not_set_caps;
4068 GST_OBJECT_LOCK (basesink);
4069 gst_caps_replace (&basesink->priv->pull_caps, caps);
4070 GST_OBJECT_UNLOCK (basesink);
4075 gst_caps_unref (caps);
4081 GST_INFO_OBJECT (basesink, "Pipeline could not agree on caps");
4082 GST_DEBUG_OBJECT (basesink, "get_allowed_caps() returned EMPTY");
4084 gst_caps_unref (caps);
4089 GST_INFO_OBJECT (basesink, "Could not set caps: %" GST_PTR_FORMAT, caps);
4090 gst_caps_unref (caps);
4095 /* this won't get called until we implement an activate function */
4097 gst_base_sink_pad_activate_pull (GstPad * pad, gboolean active)
4099 gboolean result = FALSE;
4100 GstBaseSink *basesink;
4101 GstBaseSinkClass *bclass;
4103 basesink = GST_BASE_SINK (gst_pad_get_parent (pad));
4104 bclass = GST_BASE_SINK_GET_CLASS (basesink);
4110 /* we mark we have a newsegment here because pull based
4111 * mode works just fine without having a newsegment before the
4113 format = GST_FORMAT_BYTES;
4115 gst_segment_init (&basesink->segment, format);
4116 gst_segment_init (basesink->abidata.ABI.clip_segment, format);
4117 GST_OBJECT_LOCK (basesink);
4118 basesink->have_newsegment = TRUE;
4119 GST_OBJECT_UNLOCK (basesink);
4121 /* get the peer duration in bytes */
4122 result = gst_pad_query_peer_duration (pad, &format, &duration);
4124 GST_DEBUG_OBJECT (basesink,
4125 "setting duration in bytes to %" G_GINT64_FORMAT, duration);
4126 gst_segment_set_duration (basesink->abidata.ABI.clip_segment, format,
4128 gst_segment_set_duration (&basesink->segment, format, duration);
4130 GST_DEBUG_OBJECT (basesink, "unknown duration");
4133 if (bclass->activate_pull)
4134 result = bclass->activate_pull (basesink, TRUE);
4139 goto activate_failed;
4142 if (G_UNLIKELY (basesink->pad_mode != GST_ACTIVATE_PULL)) {
4143 g_warning ("Internal GStreamer activation error!!!");
4146 result = gst_base_sink_set_flushing (basesink, pad, TRUE);
4147 if (bclass->activate_pull)
4148 result &= bclass->activate_pull (basesink, FALSE);
4149 basesink->pad_mode = GST_ACTIVATE_NONE;
4150 /* clear any pending caps */
4151 GST_OBJECT_LOCK (basesink);
4152 gst_caps_replace (&basesink->priv->pull_caps, NULL);
4153 GST_OBJECT_UNLOCK (basesink);
4156 gst_object_unref (basesink);
4163 /* reset, as starting the thread failed */
4164 basesink->pad_mode = GST_ACTIVATE_NONE;
4166 GST_ERROR_OBJECT (basesink, "subclass failed to activate in pull mode");
4171 /* send an event to our sinkpad peer. */
4173 gst_base_sink_send_event (GstElement * element, GstEvent * event)
4176 GstBaseSink *basesink = GST_BASE_SINK (element);
4177 gboolean forward, result = TRUE;
4178 GstActivateMode mode;
4180 GST_OBJECT_LOCK (element);
4181 /* get the pad and the scheduling mode */
4182 pad = gst_object_ref (basesink->sinkpad);
4183 mode = basesink->pad_mode;
4184 GST_OBJECT_UNLOCK (element);
4186 /* only push UPSTREAM events upstream */
4187 forward = GST_EVENT_IS_UPSTREAM (event);
4189 switch (GST_EVENT_TYPE (event)) {
4190 case GST_EVENT_LATENCY:
4192 GstClockTime latency;
4194 gst_event_parse_latency (event, &latency);
4196 /* store the latency. We use this to adjust the running_time before syncing
4197 * it to the clock. */
4198 GST_OBJECT_LOCK (element);
4199 basesink->priv->latency = latency;
4200 if (!basesink->priv->have_latency)
4202 GST_OBJECT_UNLOCK (element);
4203 GST_DEBUG_OBJECT (basesink, "latency set to %" GST_TIME_FORMAT,
4204 GST_TIME_ARGS (latency));
4206 /* We forward this event so that all elements know about the global pipeline
4207 * latency. This is interesting for an element when it wants to figure out
4208 * when a particular piece of data will be rendered. */
4211 case GST_EVENT_SEEK:
4212 /* in pull mode we will execute the seek */
4213 if (mode == GST_ACTIVATE_PULL)
4214 result = gst_base_sink_perform_seek (basesink, pad, event);
4216 case GST_EVENT_STEP:
4217 result = gst_base_sink_perform_step (basesink, pad, event);
4225 result = gst_pad_push_event (pad, event);
4227 /* not forwarded, unref the event */
4228 gst_event_unref (event);
4231 gst_object_unref (pad);
4235 /* get the end position of the last seen object, this is used
4236 * for EOS and for making sure that we don't report a position we
4237 * have not reached yet. With LOCK. */
4239 gst_base_sink_get_position_last (GstBaseSink * basesink, GstFormat format,
4240 gint64 * cur, gboolean * upstream)
4243 GstSegment *segment;
4244 gboolean ret = TRUE;
4246 segment = &basesink->segment;
4247 oformat = segment->format;
4249 if (oformat == GST_FORMAT_TIME) {
4250 /* return last observed stream time, we keep the stream time around in the
4252 *cur = basesink->priv->current_sstop;
4254 /* convert last stop to stream time */
4255 *cur = gst_segment_to_stream_time (segment, oformat, segment->last_stop);
4258 if (*cur != -1 && oformat != format) {
4259 GST_OBJECT_UNLOCK (basesink);
4260 /* convert to the target format if we need to, release lock first */
4262 gst_pad_query_convert (basesink->sinkpad, oformat, *cur, &format, cur);
4267 GST_OBJECT_LOCK (basesink);
4270 GST_DEBUG_OBJECT (basesink, "POSITION: %" GST_TIME_FORMAT,
4271 GST_TIME_ARGS (*cur));
4276 /* get the position when we are PAUSED, this is the stream time of the buffer
4277 * that prerolled. If no buffer is prerolled (we are still flushing), this
4278 * value will be -1. With LOCK. */
4280 gst_base_sink_get_position_paused (GstBaseSink * basesink, GstFormat format,
4281 gint64 * cur, gboolean * upstream)
4285 GstSegment *segment;
4288 /* we don't use the clip segment in pull mode, when seeking we update the
4289 * main segment directly with the new segment values without it having to be
4290 * activated by the rendering after preroll */
4291 if (basesink->pad_mode == GST_ACTIVATE_PUSH)
4292 segment = basesink->abidata.ABI.clip_segment;
4294 segment = &basesink->segment;
4295 oformat = segment->format;
4297 if (oformat == GST_FORMAT_TIME) {
4298 *cur = basesink->priv->current_sstart;
4299 if (segment->rate < 0.0 &&
4300 GST_CLOCK_TIME_IS_VALID (basesink->priv->current_sstop)) {
4301 /* for reverse playback we prefer the stream time stop position if we have
4303 *cur = basesink->priv->current_sstop;
4306 *cur = gst_segment_to_stream_time (segment, oformat, segment->last_stop);
4309 time = segment->time;
4312 *cur = MAX (*cur, time);
4313 GST_DEBUG_OBJECT (basesink, "POSITION as max: %" GST_TIME_FORMAT
4314 ", time %" GST_TIME_FORMAT, GST_TIME_ARGS (*cur), GST_TIME_ARGS (time));
4316 /* we have no buffer, use the segment times. */
4317 if (segment->rate >= 0.0) {
4318 /* forward, next position is always the time of the segment */
4320 GST_DEBUG_OBJECT (basesink, "POSITION as time: %" GST_TIME_FORMAT,
4321 GST_TIME_ARGS (*cur));
4323 /* reverse, next expected timestamp is segment->stop. We use the function
4324 * to get things right for negative applied_rates. */
4325 *cur = gst_segment_to_stream_time (segment, oformat, segment->stop);
4326 GST_DEBUG_OBJECT (basesink, "reverse POSITION: %" GST_TIME_FORMAT,
4327 GST_TIME_ARGS (*cur));
4332 if (res && oformat != format) {
4333 GST_OBJECT_UNLOCK (basesink);
4335 gst_pad_query_convert (basesink->sinkpad, oformat, *cur, &format, cur);
4340 GST_OBJECT_LOCK (basesink);
4347 gst_base_sink_get_position (GstBaseSink * basesink, GstFormat format,
4348 gint64 * cur, gboolean * upstream)
4351 gboolean res = FALSE;
4352 GstFormat oformat, tformat;
4353 GstClockTime now, latency;
4354 GstClockTimeDiff base;
4355 gint64 time, accum, duration;
4359 GST_OBJECT_LOCK (basesink);
4360 /* our intermediate time format */
4361 tformat = GST_FORMAT_TIME;
4362 /* get the format in the segment */
4363 oformat = basesink->segment.format;
4365 /* can only give answer based on the clock if not EOS */
4366 if (G_UNLIKELY (basesink->eos))
4369 /* we can only get the segment when we are not NULL or READY */
4370 if (!basesink->have_newsegment)
4373 /* when not in PLAYING or when we're busy with a state change, we
4374 * cannot read from the clock so we report time based on the
4375 * last seen timestamp. */
4376 if (GST_STATE (basesink) != GST_STATE_PLAYING ||
4377 GST_STATE_PENDING (basesink) != GST_STATE_VOID_PENDING)
4380 /* we need to sync on the clock. */
4381 if (basesink->sync == FALSE)
4384 /* and we need a clock */
4385 if (G_UNLIKELY ((clock = GST_ELEMENT_CLOCK (basesink)) == NULL))
4388 /* collect all data we need holding the lock */
4389 if (GST_CLOCK_TIME_IS_VALID (basesink->segment.time))
4390 time = basesink->segment.time;
4394 if (GST_CLOCK_TIME_IS_VALID (basesink->segment.stop))
4395 duration = basesink->segment.stop - basesink->segment.start;
4399 base = GST_ELEMENT_CAST (basesink)->base_time;
4400 accum = basesink->segment.accum;
4401 rate = basesink->segment.rate * basesink->segment.applied_rate;
4402 latency = basesink->priv->latency;
4404 gst_object_ref (clock);
4406 /* this function might release the LOCK */
4407 gst_base_sink_get_position_last (basesink, format, &last, upstream);
4409 /* need to release the object lock before we can get the time,
4410 * a clock might take the LOCK of the provider, which could be
4411 * a basesink subclass. */
4412 GST_OBJECT_UNLOCK (basesink);
4414 now = gst_clock_get_time (clock);
4416 if (oformat != tformat) {
4417 /* convert accum, time and duration to time */
4418 if (!gst_pad_query_convert (basesink->sinkpad, oformat, accum, &tformat,
4420 goto convert_failed;
4421 if (!gst_pad_query_convert (basesink->sinkpad, oformat, duration, &tformat,
4423 goto convert_failed;
4424 if (!gst_pad_query_convert (basesink->sinkpad, oformat, time, &tformat,
4426 goto convert_failed;
4429 /* subtract base time and accumulated time from the clock time.
4430 * Make sure we don't go negative. This is the current time in
4431 * the segment which we need to scale with the combined
4432 * rate and applied rate. */
4435 if (GST_CLOCK_DIFF (base, now) < 0)
4438 /* for negative rates we need to count back from the segment
4443 *cur = time + gst_guint64_to_gdouble (now - base) * rate;
4445 /* never report more than last seen position */
4447 *cur = MIN (last, *cur);
4449 gst_object_unref (clock);
4451 GST_DEBUG_OBJECT (basesink,
4452 "now %" GST_TIME_FORMAT " - base %" GST_TIME_FORMAT " - accum %"
4453 GST_TIME_FORMAT " + time %" GST_TIME_FORMAT,
4454 GST_TIME_ARGS (now), GST_TIME_ARGS (base),
4455 GST_TIME_ARGS (accum), GST_TIME_ARGS (time));
4457 if (oformat != format) {
4458 /* convert time to final format */
4459 if (!gst_pad_query_convert (basesink->sinkpad, tformat, *cur, &format, cur))
4460 goto convert_failed;
4466 GST_DEBUG_OBJECT (basesink, "res: %d, POSITION: %" GST_TIME_FORMAT,
4467 res, GST_TIME_ARGS (*cur));
4473 GST_DEBUG_OBJECT (basesink, "position in EOS");
4474 res = gst_base_sink_get_position_last (basesink, format, cur, upstream);
4475 GST_OBJECT_UNLOCK (basesink);
4480 GST_DEBUG_OBJECT (basesink, "position in PAUSED");
4481 res = gst_base_sink_get_position_paused (basesink, format, cur, upstream);
4482 GST_OBJECT_UNLOCK (basesink);
4487 /* in NULL or READY we always return FALSE and -1 */
4488 GST_DEBUG_OBJECT (basesink, "position in wrong state, return -1");
4491 GST_OBJECT_UNLOCK (basesink);
4496 /* report last seen timestamp if any, else ask upstream to answer */
4497 if ((*cur = basesink->priv->current_sstart) != -1)
4502 GST_DEBUG_OBJECT (basesink, "no sync, res %d, POSITION %" GST_TIME_FORMAT,
4503 res, GST_TIME_ARGS (*cur));
4504 GST_OBJECT_UNLOCK (basesink);
4509 GST_DEBUG_OBJECT (basesink, "convert failed, try upstream");
4516 gst_base_sink_query (GstElement * element, GstQuery * query)
4518 gboolean res = FALSE;
4520 GstBaseSink *basesink = GST_BASE_SINK (element);
4522 switch (GST_QUERY_TYPE (query)) {
4523 case GST_QUERY_POSITION:
4527 gboolean upstream = FALSE;
4529 gst_query_parse_position (query, &format, NULL);
4531 GST_DEBUG_OBJECT (basesink, "position query in format %s",
4532 gst_format_get_name (format));
4534 /* first try to get the position based on the clock */
4536 gst_base_sink_get_position (basesink, format, &cur, &upstream))) {
4537 gst_query_set_position (query, format, cur);
4538 } else if (upstream) {
4539 /* fallback to peer query */
4540 res = gst_pad_peer_query (basesink->sinkpad, query);
4544 case GST_QUERY_DURATION:
4546 GstFormat format, uformat;
4547 gint64 duration, uduration;
4549 gst_query_parse_duration (query, &format, NULL);
4551 GST_DEBUG_OBJECT (basesink, "duration query in format %s",
4552 gst_format_get_name (format));
4554 if (basesink->pad_mode == GST_ACTIVATE_PULL) {
4555 uformat = GST_FORMAT_BYTES;
4557 /* get the duration in bytes, in pull mode that's all we are sure to
4558 * know. We have to explicitly get this value from upstream instead of
4559 * using our cached value because it might change. Duration caching
4560 * should be done at a higher level. */
4561 res = gst_pad_query_peer_duration (basesink->sinkpad, &uformat,
4564 gst_segment_set_duration (&basesink->segment, uformat, uduration);
4565 if (format != uformat) {
4566 /* convert to the requested format */
4567 res = gst_pad_query_convert (basesink->sinkpad, uformat, uduration,
4568 &format, &duration);
4570 duration = uduration;
4573 /* set the result */
4574 gst_query_set_duration (query, format, duration);
4578 /* in push mode we simply forward upstream */
4579 res = gst_pad_peer_query (basesink->sinkpad, query);
4583 case GST_QUERY_LATENCY:
4585 gboolean live, us_live;
4586 GstClockTime min, max;
4588 if ((res = gst_base_sink_query_latency (basesink, &live, &us_live, &min,
4590 gst_query_set_latency (query, live, min, max);
4594 case GST_QUERY_JITTER:
4596 case GST_QUERY_RATE:
4597 /* gst_query_set_rate (query, basesink->segment_rate); */
4600 case GST_QUERY_SEGMENT:
4602 /* FIXME, bring start/stop to stream time */
4603 gst_query_set_segment (query, basesink->segment.rate,
4604 GST_FORMAT_TIME, basesink->segment.start, basesink->segment.stop);
4607 case GST_QUERY_SEEKING:
4608 case GST_QUERY_CONVERT:
4609 case GST_QUERY_FORMATS:
4611 res = gst_pad_peer_query (basesink->sinkpad, query);
4614 GST_DEBUG_OBJECT (basesink, "query %s returns %d",
4615 GST_QUERY_TYPE_NAME (query), res);
4619 static GstStateChangeReturn
4620 gst_base_sink_change_state (GstElement * element, GstStateChange transition)
4622 GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
4623 GstBaseSink *basesink = GST_BASE_SINK (element);
4624 GstBaseSinkClass *bclass;
4625 GstBaseSinkPrivate *priv;
4627 priv = basesink->priv;
4629 bclass = GST_BASE_SINK_GET_CLASS (basesink);
4631 switch (transition) {
4632 case GST_STATE_CHANGE_NULL_TO_READY:
4634 if (!bclass->start (basesink))
4637 case GST_STATE_CHANGE_READY_TO_PAUSED:
4638 /* need to complete preroll before this state change completes, there
4639 * is no data flow in READY so we can safely assume we need to preroll. */
4640 GST_PAD_PREROLL_LOCK (basesink->sinkpad);
4641 GST_DEBUG_OBJECT (basesink, "READY to PAUSED");
4642 basesink->have_newsegment = FALSE;
4643 gst_segment_init (&basesink->segment, GST_FORMAT_UNDEFINED);
4644 gst_segment_init (basesink->abidata.ABI.clip_segment,
4645 GST_FORMAT_UNDEFINED);
4646 basesink->offset = 0;
4647 basesink->have_preroll = FALSE;
4648 priv->step_unlock = FALSE;
4649 basesink->need_preroll = TRUE;
4650 basesink->playing_async = TRUE;
4651 priv->current_sstart = GST_CLOCK_TIME_NONE;
4652 priv->current_sstop = GST_CLOCK_TIME_NONE;
4653 priv->eos_rtime = GST_CLOCK_TIME_NONE;
4655 basesink->eos = FALSE;
4656 priv->received_eos = FALSE;
4657 gst_base_sink_reset_qos (basesink);
4658 priv->commited = FALSE;
4659 priv->call_preroll = TRUE;
4660 priv->current_step.valid = FALSE;
4661 priv->pending_step.valid = FALSE;
4662 if (priv->async_enabled) {
4663 GST_DEBUG_OBJECT (basesink, "doing async state change");
4664 /* when async enabled, post async-start message and return ASYNC from
4665 * the state change function */
4666 ret = GST_STATE_CHANGE_ASYNC;
4667 gst_element_post_message (GST_ELEMENT_CAST (basesink),
4668 gst_message_new_async_start (GST_OBJECT_CAST (basesink), FALSE));
4670 priv->have_latency = TRUE;
4672 GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
4674 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
4675 GST_PAD_PREROLL_LOCK (basesink->sinkpad);
4676 if (!gst_base_sink_needs_preroll (basesink)) {
4677 GST_DEBUG_OBJECT (basesink, "PAUSED to PLAYING, don't need preroll");
4678 /* no preroll needed anymore now. */
4679 basesink->playing_async = FALSE;
4680 basesink->need_preroll = FALSE;
4681 if (basesink->eos) {
4682 GstMessage *message;
4684 /* need to post EOS message here */
4685 GST_DEBUG_OBJECT (basesink, "Now posting EOS");
4686 message = gst_message_new_eos (GST_OBJECT_CAST (basesink));
4687 gst_message_set_seqnum (message, basesink->priv->seqnum);
4688 gst_element_post_message (GST_ELEMENT_CAST (basesink), message);
4690 GST_DEBUG_OBJECT (basesink, "signal preroll");
4691 GST_PAD_PREROLL_SIGNAL (basesink->sinkpad);
4694 GST_DEBUG_OBJECT (basesink, "PAUSED to PLAYING, we are not prerolled");
4695 basesink->need_preroll = TRUE;
4696 basesink->playing_async = TRUE;
4697 priv->call_preroll = TRUE;
4698 priv->commited = FALSE;
4699 if (priv->async_enabled) {
4700 GST_DEBUG_OBJECT (basesink, "doing async state change");
4701 ret = GST_STATE_CHANGE_ASYNC;
4702 gst_element_post_message (GST_ELEMENT_CAST (basesink),
4703 gst_message_new_async_start (GST_OBJECT_CAST (basesink), FALSE));
4706 GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
4713 GstStateChangeReturn bret;
4715 bret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
4716 if (G_UNLIKELY (bret == GST_STATE_CHANGE_FAILURE))
4717 goto activate_failed;
4720 switch (transition) {
4721 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
4722 GST_DEBUG_OBJECT (basesink, "PLAYING to PAUSED");
4723 /* FIXME, make sure we cannot enter _render first */
4725 /* we need to call ::unlock before locking PREROLL_LOCK
4726 * since we lock it before going into ::render */
4728 bclass->unlock (basesink);
4730 GST_PAD_PREROLL_LOCK (basesink->sinkpad);
4731 GST_DEBUG_OBJECT (basesink, "got preroll lock");
4732 /* now that we have the PREROLL lock, clear our unlock request */
4733 if (bclass->unlock_stop)
4734 bclass->unlock_stop (basesink);
4736 /* we need preroll again and we set the flag before unlocking the clockid
4737 * because if the clockid is unlocked before a current buffer expired, we
4738 * can use that buffer to preroll with */
4739 basesink->need_preroll = TRUE;
4741 if (basesink->clock_id) {
4742 GST_DEBUG_OBJECT (basesink, "unschedule clock");
4743 gst_clock_id_unschedule (basesink->clock_id);
4746 /* if we don't have a preroll buffer we need to wait for a preroll and
4748 if (!gst_base_sink_needs_preroll (basesink)) {
4749 GST_DEBUG_OBJECT (basesink, "PLAYING to PAUSED, we are prerolled");
4750 basesink->playing_async = FALSE;
4752 if (GST_STATE_TARGET (GST_ELEMENT (basesink)) <= GST_STATE_READY) {
4753 GST_DEBUG_OBJECT (basesink, "element is <= READY");
4754 ret = GST_STATE_CHANGE_SUCCESS;
4756 GST_DEBUG_OBJECT (basesink,
4757 "PLAYING to PAUSED, we are not prerolled");
4758 basesink->playing_async = TRUE;
4759 priv->commited = FALSE;
4760 priv->call_preroll = TRUE;
4761 if (priv->async_enabled) {
4762 GST_DEBUG_OBJECT (basesink, "doing async state change");
4763 ret = GST_STATE_CHANGE_ASYNC;
4764 gst_element_post_message (GST_ELEMENT_CAST (basesink),
4765 gst_message_new_async_start (GST_OBJECT_CAST (basesink),
4770 GST_DEBUG_OBJECT (basesink, "rendered: %" G_GUINT64_FORMAT
4771 ", dropped: %" G_GUINT64_FORMAT, priv->rendered, priv->dropped);
4773 gst_base_sink_reset_qos (basesink);
4774 GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
4776 case GST_STATE_CHANGE_PAUSED_TO_READY:
4777 GST_PAD_PREROLL_LOCK (basesink->sinkpad);
4778 /* start by reseting our position state with the object lock so that the
4779 * position query gets the right idea. We do this before we post the
4780 * messages so that the message handlers pick this up. */
4781 GST_OBJECT_LOCK (basesink);
4782 basesink->have_newsegment = FALSE;
4783 priv->current_sstart = GST_CLOCK_TIME_NONE;
4784 priv->current_sstop = GST_CLOCK_TIME_NONE;
4785 priv->have_latency = FALSE;
4786 GST_OBJECT_UNLOCK (basesink);
4788 gst_base_sink_set_last_buffer (basesink, NULL);
4789 priv->call_preroll = FALSE;
4791 if (!priv->commited) {
4792 if (priv->async_enabled) {
4793 GST_DEBUG_OBJECT (basesink, "PAUSED to READY, posting async-done");
4795 gst_element_post_message (GST_ELEMENT_CAST (basesink),
4796 gst_message_new_state_changed (GST_OBJECT_CAST (basesink),
4797 GST_STATE_PLAYING, GST_STATE_PAUSED, GST_STATE_READY));
4799 gst_element_post_message (GST_ELEMENT_CAST (basesink),
4800 gst_message_new_async_done (GST_OBJECT_CAST (basesink)));
4802 priv->commited = TRUE;
4804 GST_DEBUG_OBJECT (basesink, "PAUSED to READY, don't need_preroll");
4806 GST_PAD_PREROLL_UNLOCK (basesink->sinkpad);
4808 case GST_STATE_CHANGE_READY_TO_NULL:
4810 if (!bclass->stop (basesink)) {
4811 GST_WARNING_OBJECT (basesink, "failed to stop");
4814 gst_base_sink_set_last_buffer (basesink, NULL);
4815 priv->call_preroll = FALSE;
4826 GST_DEBUG_OBJECT (basesink, "failed to start");
4827 return GST_STATE_CHANGE_FAILURE;
4831 GST_DEBUG_OBJECT (basesink,
4832 "element failed to change states -- activation problem?");
4833 return GST_STATE_CHANGE_FAILURE;