2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
4 * 2003 Colin Walters <cwalters@gnome.org>
5 * 2005 Wim Taymans <wim@fluendo.com>
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Library General Public
11 * License as published by the Free Software Foundation; either
12 * version 2 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Library General Public License for more details.
19 * You should have received a copy of the GNU Library General Public
20 * License along with this library; if not, write to the
21 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
22 * Boston, MA 02110-1301, USA.
26 * SECTION:element-queue
29 * Data is queued until one of the limits specified by the
30 * #GstQueue:max-size-buffers, #GstQueue:max-size-bytes and/or
31 * #GstQueue:max-size-time properties has been reached. Any attempt to push
32 * more buffers into the queue will block the pushing thread until more space
35 * The queue will create a new thread on the source pad to decouple the
36 * processing on sink and source pad.
38 * You can query how many buffers are queued by reading the
39 * #GstQueue:current-level-buffers property. You can track changes
40 * by connecting to the notify::current-level-buffers signal (which
41 * like all signals will be emitted from the streaming thread). The same
42 * applies to the #GstQueue:current-level-time and
43 * #GstQueue:current-level-bytes properties.
45 * The default queue size limits are 200 buffers, 10MB of data, or
46 * one second worth of data, whichever is reached first.
48 * As said earlier, the queue blocks by default when one of the specified
49 * maximums (bytes, time, buffers) has been reached. You can set the
50 * #GstQueue:leaky property to specify that instead of blocking it should
51 * leak (drop) new or old buffers.
53 * The #GstQueue::underrun signal is emitted when the queue has less data than
54 * the specified minimum thresholds require (by default: when the queue is
55 * empty). The #GstQueue::overrun signal is emitted when the queue is filled
56 * up. Both signals are emitted from the context of the streaming thread.
59 #include "gst/gst_private.h"
64 #include "../../gst/gst-i18n-lib.h"
65 #include "../../gst/glib-compat-private.h"
67 static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
72 static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
77 GST_DEBUG_CATEGORY_STATIC (queue_debug);
78 #define GST_CAT_DEFAULT (queue_debug)
79 GST_DEBUG_CATEGORY_STATIC (queue_dataflow);
81 #define STATUS(queue, pad, msg) \
82 GST_CAT_LOG_OBJECT (queue_dataflow, queue, \
83 "(%s:%s) " msg ": %u of %u-%u buffers, %u of %u-%u " \
84 "bytes, %" G_GUINT64_FORMAT " of %" G_GUINT64_FORMAT \
85 "-%" G_GUINT64_FORMAT " ns, %u items", \
86 GST_DEBUG_PAD_NAME (pad), \
87 queue->cur_level.buffers, \
88 queue->min_threshold.buffers, \
89 queue->max_size.buffers, \
90 queue->cur_level.bytes, \
91 queue->min_threshold.bytes, \
92 queue->max_size.bytes, \
93 queue->cur_level.time, \
94 queue->min_threshold.time, \
95 queue->max_size.time, \
96 gst_queue_array_get_length (queue->queue))
98 /* Queue signals and args */
111 /* FIXME: don't we have another way of doing this
112 * "Gstreamer format" (frame/byte/time) queries? */
113 PROP_CUR_LEVEL_BUFFERS,
114 PROP_CUR_LEVEL_BYTES,
116 PROP_MAX_SIZE_BUFFERS,
119 PROP_MIN_THRESHOLD_BUFFERS,
120 PROP_MIN_THRESHOLD_BYTES,
121 PROP_MIN_THRESHOLD_TIME,
127 /* default property values */
128 #define DEFAULT_MAX_SIZE_BUFFERS 200 /* 200 buffers */
129 #define DEFAULT_MAX_SIZE_BYTES (10 * 1024 * 1024) /* 10 MB */
130 #define DEFAULT_MAX_SIZE_TIME GST_SECOND /* 1 second */
132 #define GST_QUEUE_MUTEX_LOCK(q) G_STMT_START { \
133 g_mutex_lock (&q->qlock); \
136 #define GST_QUEUE_MUTEX_LOCK_CHECK(q,label) G_STMT_START { \
137 GST_QUEUE_MUTEX_LOCK (q); \
138 if (q->srcresult != GST_FLOW_OK) \
142 #define GST_QUEUE_MUTEX_UNLOCK(q) G_STMT_START { \
143 g_mutex_unlock (&q->qlock); \
146 #define GST_QUEUE_WAIT_DEL_CHECK(q, label) G_STMT_START { \
147 STATUS (q, q->sinkpad, "wait for DEL"); \
148 q->waiting_del = TRUE; \
149 g_cond_wait (&q->item_del, &q->qlock); \
150 q->waiting_del = FALSE; \
151 if (q->srcresult != GST_FLOW_OK) { \
152 STATUS (q, q->srcpad, "received DEL wakeup"); \
155 STATUS (q, q->sinkpad, "received DEL"); \
158 #define GST_QUEUE_WAIT_ADD_CHECK(q, label) G_STMT_START { \
159 STATUS (q, q->srcpad, "wait for ADD"); \
160 q->waiting_add = TRUE; \
161 g_cond_wait (&q->item_add, &q->qlock); \
162 q->waiting_add = FALSE; \
163 if (q->srcresult != GST_FLOW_OK) { \
164 STATUS (q, q->srcpad, "received ADD wakeup"); \
167 STATUS (q, q->srcpad, "received ADD"); \
170 #define GST_QUEUE_SIGNAL_DEL(q) G_STMT_START { \
171 if (q->waiting_del) { \
172 STATUS (q, q->srcpad, "signal DEL"); \
173 g_cond_signal (&q->item_del); \
177 #define GST_QUEUE_SIGNAL_ADD(q) G_STMT_START { \
178 if (q->waiting_add) { \
179 STATUS (q, q->sinkpad, "signal ADD"); \
180 g_cond_signal (&q->item_add); \
185 GST_DEBUG_CATEGORY_INIT (queue_debug, "queue", 0, "queue element"); \
186 GST_DEBUG_CATEGORY_INIT (queue_dataflow, "queue_dataflow", 0, \
187 "dataflow inside the queue element");
188 #define gst_queue_parent_class parent_class
189 G_DEFINE_TYPE_WITH_CODE (GstQueue, gst_queue, GST_TYPE_ELEMENT, _do_init);
191 static void gst_queue_finalize (GObject * object);
192 static void gst_queue_set_property (GObject * object,
193 guint prop_id, const GValue * value, GParamSpec * pspec);
194 static void gst_queue_get_property (GObject * object,
195 guint prop_id, GValue * value, GParamSpec * pspec);
197 static GstFlowReturn gst_queue_chain (GstPad * pad, GstObject * parent,
199 static GstFlowReturn gst_queue_chain_list (GstPad * pad, GstObject * parent,
200 GstBufferList * buffer_list);
201 static GstFlowReturn gst_queue_push_one (GstQueue * queue);
202 static void gst_queue_loop (GstPad * pad);
204 static GstFlowReturn gst_queue_handle_sink_event (GstPad * pad,
205 GstObject * parent, GstEvent * event);
206 static gboolean gst_queue_handle_sink_query (GstPad * pad, GstObject * parent,
209 static gboolean gst_queue_handle_src_event (GstPad * pad, GstObject * parent,
211 static gboolean gst_queue_handle_src_query (GstPad * pad, GstObject * parent,
214 static void gst_queue_locked_flush (GstQueue * queue, gboolean full);
216 static gboolean gst_queue_src_activate_mode (GstPad * pad, GstObject * parent,
217 GstPadMode mode, gboolean active);
218 static gboolean gst_queue_sink_activate_mode (GstPad * pad, GstObject * parent,
219 GstPadMode mode, gboolean active);
221 static gboolean gst_queue_is_empty (GstQueue * queue);
222 static gboolean gst_queue_is_filled (GstQueue * queue);
232 #define GST_TYPE_QUEUE_LEAKY (queue_leaky_get_type ())
235 queue_leaky_get_type (void)
237 static GType queue_leaky_type = 0;
238 static const GEnumValue queue_leaky[] = {
239 {GST_QUEUE_NO_LEAK, "Not Leaky", "no"},
240 {GST_QUEUE_LEAK_UPSTREAM, "Leaky on upstream (new buffers)", "upstream"},
241 {GST_QUEUE_LEAK_DOWNSTREAM, "Leaky on downstream (old buffers)",
246 if (!queue_leaky_type) {
247 queue_leaky_type = g_enum_register_static ("GstQueueLeaky", queue_leaky);
249 return queue_leaky_type;
252 static guint gst_queue_signals[LAST_SIGNAL] = { 0 };
255 gst_queue_class_init (GstQueueClass * klass)
257 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
258 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
260 gobject_class->set_property = gst_queue_set_property;
261 gobject_class->get_property = gst_queue_get_property;
265 * GstQueue::underrun:
266 * @queue: the queue instance
268 * Reports that the buffer became empty (underrun).
269 * A buffer is empty if the total amount of data inside it (num-buffers, time,
270 * size) is lower than the boundary values which can be set through the
271 * GObject properties.
273 gst_queue_signals[SIGNAL_UNDERRUN] =
274 g_signal_new ("underrun", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
275 G_STRUCT_OFFSET (GstQueueClass, underrun), NULL, NULL,
276 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
279 * @queue: the queue instance
281 * Reports that enough (min-threshold) data is in the queue. Use this signal
282 * together with the underrun signal to pause the pipeline on underrun and
283 * wait for the queue to fill-up before resume playback.
285 gst_queue_signals[SIGNAL_RUNNING] =
286 g_signal_new ("running", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
287 G_STRUCT_OFFSET (GstQueueClass, running), NULL, NULL,
288 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
291 * @queue: the queue instance
293 * Reports that the buffer became full (overrun).
294 * A buffer is full if the total amount of data inside it (num-buffers, time,
295 * size) is higher than the boundary values which can be set through the
296 * GObject properties.
298 gst_queue_signals[SIGNAL_OVERRUN] =
299 g_signal_new ("overrun", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
300 G_STRUCT_OFFSET (GstQueueClass, overrun), NULL, NULL,
301 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
304 * @queue: the queue instance
306 * Reports when the queue has enough data to start pushing data again on the
309 gst_queue_signals[SIGNAL_PUSHING] =
310 g_signal_new ("pushing", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
311 G_STRUCT_OFFSET (GstQueueClass, pushing), NULL, NULL,
312 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
315 g_object_class_install_property (gobject_class, PROP_CUR_LEVEL_BYTES,
316 g_param_spec_uint ("current-level-bytes", "Current level (kB)",
317 "Current amount of data in the queue (bytes)",
318 0, G_MAXUINT, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
319 g_object_class_install_property (gobject_class, PROP_CUR_LEVEL_BUFFERS,
320 g_param_spec_uint ("current-level-buffers", "Current level (buffers)",
321 "Current number of buffers in the queue",
322 0, G_MAXUINT, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
323 g_object_class_install_property (gobject_class, PROP_CUR_LEVEL_TIME,
324 g_param_spec_uint64 ("current-level-time", "Current level (ns)",
325 "Current amount of data in the queue (in ns)",
326 0, G_MAXUINT64, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
328 g_object_class_install_property (gobject_class, PROP_MAX_SIZE_BYTES,
329 g_param_spec_uint ("max-size-bytes", "Max. size (kB)",
330 "Max. amount of data in the queue (bytes, 0=disable)",
331 0, G_MAXUINT, DEFAULT_MAX_SIZE_BYTES,
332 G_PARAM_READWRITE | GST_PARAM_MUTABLE_PLAYING |
333 G_PARAM_STATIC_STRINGS));
334 g_object_class_install_property (gobject_class, PROP_MAX_SIZE_BUFFERS,
335 g_param_spec_uint ("max-size-buffers", "Max. size (buffers)",
336 "Max. number of buffers in the queue (0=disable)", 0, G_MAXUINT,
337 DEFAULT_MAX_SIZE_BUFFERS,
338 G_PARAM_READWRITE | GST_PARAM_MUTABLE_PLAYING |
339 G_PARAM_STATIC_STRINGS));
340 g_object_class_install_property (gobject_class, PROP_MAX_SIZE_TIME,
341 g_param_spec_uint64 ("max-size-time", "Max. size (ns)",
342 "Max. amount of data in the queue (in ns, 0=disable)", 0, G_MAXUINT64,
343 DEFAULT_MAX_SIZE_TIME,
344 G_PARAM_READWRITE | GST_PARAM_MUTABLE_PLAYING |
345 G_PARAM_STATIC_STRINGS));
347 g_object_class_install_property (gobject_class, PROP_MIN_THRESHOLD_BYTES,
348 g_param_spec_uint ("min-threshold-bytes", "Min. threshold (kB)",
349 "Min. amount of data in the queue to allow reading (bytes, 0=disable)",
351 G_PARAM_READWRITE | GST_PARAM_MUTABLE_PLAYING |
352 G_PARAM_STATIC_STRINGS));
353 g_object_class_install_property (gobject_class, PROP_MIN_THRESHOLD_BUFFERS,
354 g_param_spec_uint ("min-threshold-buffers", "Min. threshold (buffers)",
355 "Min. number of buffers in the queue to allow reading (0=disable)", 0,
357 G_PARAM_READWRITE | GST_PARAM_MUTABLE_PLAYING |
358 G_PARAM_STATIC_STRINGS));
359 g_object_class_install_property (gobject_class, PROP_MIN_THRESHOLD_TIME,
360 g_param_spec_uint64 ("min-threshold-time", "Min. threshold (ns)",
361 "Min. amount of data in the queue to allow reading (in ns, 0=disable)",
363 G_PARAM_READWRITE | GST_PARAM_MUTABLE_PLAYING |
364 G_PARAM_STATIC_STRINGS));
366 g_object_class_install_property (gobject_class, PROP_LEAKY,
367 g_param_spec_enum ("leaky", "Leaky",
368 "Where the queue leaks, if at all",
369 GST_TYPE_QUEUE_LEAKY, GST_QUEUE_NO_LEAK,
370 G_PARAM_READWRITE | GST_PARAM_MUTABLE_PLAYING |
371 G_PARAM_STATIC_STRINGS));
376 * Don't emit queue signals. Makes queues more lightweight if no signals are
379 g_object_class_install_property (gobject_class, PROP_SILENT,
380 g_param_spec_boolean ("silent", "Silent",
381 "Don't emit queue signals", FALSE,
382 G_PARAM_READWRITE | GST_PARAM_MUTABLE_PLAYING |
383 G_PARAM_STATIC_STRINGS));
386 * GstQueue:flush-on-eos
388 * Discard all data in the queue when an EOS event is received, and pass
389 * on the EOS event as soon as possible (instead of waiting until all
390 * buffers in the queue have been processed, which is the default behaviour).
392 * Flushing the queue on EOS might be useful when capturing and encoding
393 * from a live source, to finish up the recording quickly in cases when
394 * the encoder is slow. Note that this might mean some data from the end of
395 * the recording data might be lost though (never more than the configured
396 * max. sizes though).
400 g_object_class_install_property (gobject_class, PROP_FLUSH_ON_EOS,
401 g_param_spec_boolean ("flush-on-eos", "Flush on EOS",
402 "Discard all data in the queue when an EOS event is received", FALSE,
403 G_PARAM_READWRITE | GST_PARAM_MUTABLE_PLAYING |
404 G_PARAM_STATIC_STRINGS));
406 gobject_class->finalize = gst_queue_finalize;
408 gst_element_class_set_static_metadata (gstelement_class,
410 "Generic", "Simple data queue", "Erik Walthinsen <omega@cse.ogi.edu>");
411 gst_element_class_add_static_pad_template (gstelement_class, &srctemplate);
412 gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate);
414 /* Registering debug symbols for function pointers */
415 GST_DEBUG_REGISTER_FUNCPTR (gst_queue_src_activate_mode);
416 GST_DEBUG_REGISTER_FUNCPTR (gst_queue_handle_sink_event);
417 GST_DEBUG_REGISTER_FUNCPTR (gst_queue_handle_sink_query);
418 GST_DEBUG_REGISTER_FUNCPTR (gst_queue_handle_src_event);
419 GST_DEBUG_REGISTER_FUNCPTR (gst_queue_handle_src_query);
420 GST_DEBUG_REGISTER_FUNCPTR (gst_queue_chain);
421 GST_DEBUG_REGISTER_FUNCPTR (gst_queue_chain_list);
425 gst_queue_init (GstQueue * queue)
427 queue->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink");
429 gst_pad_set_chain_function (queue->sinkpad, gst_queue_chain);
430 gst_pad_set_chain_list_function (queue->sinkpad, gst_queue_chain_list);
431 gst_pad_set_activatemode_function (queue->sinkpad,
432 gst_queue_sink_activate_mode);
433 gst_pad_set_event_full_function (queue->sinkpad, gst_queue_handle_sink_event);
434 gst_pad_set_query_function (queue->sinkpad, gst_queue_handle_sink_query);
435 GST_PAD_SET_PROXY_CAPS (queue->sinkpad);
436 gst_element_add_pad (GST_ELEMENT (queue), queue->sinkpad);
438 queue->srcpad = gst_pad_new_from_static_template (&srctemplate, "src");
440 gst_pad_set_activatemode_function (queue->srcpad,
441 gst_queue_src_activate_mode);
442 gst_pad_set_event_function (queue->srcpad, gst_queue_handle_src_event);
443 gst_pad_set_query_function (queue->srcpad, gst_queue_handle_src_query);
444 GST_PAD_SET_PROXY_CAPS (queue->srcpad);
445 gst_element_add_pad (GST_ELEMENT (queue), queue->srcpad);
447 GST_QUEUE_CLEAR_LEVEL (queue->cur_level);
448 queue->max_size.buffers = DEFAULT_MAX_SIZE_BUFFERS;
449 queue->max_size.bytes = DEFAULT_MAX_SIZE_BYTES;
450 queue->max_size.time = DEFAULT_MAX_SIZE_TIME;
451 GST_QUEUE_CLEAR_LEVEL (queue->min_threshold);
452 GST_QUEUE_CLEAR_LEVEL (queue->orig_min_threshold);
453 gst_segment_init (&queue->sink_segment, GST_FORMAT_TIME);
454 gst_segment_init (&queue->src_segment, GST_FORMAT_TIME);
455 queue->head_needs_discont = queue->tail_needs_discont = FALSE;
457 queue->leaky = GST_QUEUE_NO_LEAK;
458 queue->srcresult = GST_FLOW_FLUSHING;
460 g_mutex_init (&queue->qlock);
461 g_cond_init (&queue->item_add);
462 g_cond_init (&queue->item_del);
463 g_cond_init (&queue->query_handled);
466 gst_queue_array_new_for_struct (sizeof (GstQueueItem),
467 DEFAULT_MAX_SIZE_BUFFERS * 3 / 2);
469 queue->sinktime = GST_CLOCK_STIME_NONE;
470 queue->srctime = GST_CLOCK_STIME_NONE;
472 queue->sink_tainted = TRUE;
473 queue->src_tainted = TRUE;
475 queue->newseg_applied_to_src = FALSE;
477 GST_DEBUG_OBJECT (queue,
478 "initialized queue's not_empty & not_full conditions");
481 /* called only once, as opposed to dispose */
483 gst_queue_finalize (GObject * object)
485 GstQueue *queue = GST_QUEUE (object);
488 GST_DEBUG_OBJECT (queue, "finalizing queue");
490 while ((qitem = gst_queue_array_pop_head_struct (queue->queue))) {
491 /* FIXME: if it's a query, shouldn't we unref that too? */
492 if (!qitem->is_query)
493 gst_mini_object_unref (qitem->item);
495 gst_queue_array_free (queue->queue);
497 g_mutex_clear (&queue->qlock);
498 g_cond_clear (&queue->item_add);
499 g_cond_clear (&queue->item_del);
500 g_cond_clear (&queue->query_handled);
502 G_OBJECT_CLASS (parent_class)->finalize (object);
505 /* Convenience function */
506 static inline GstClockTimeDiff
507 my_segment_to_running_time (GstSegment * segment, GstClockTime val)
509 GstClockTimeDiff res = GST_CLOCK_STIME_NONE;
511 if (GST_CLOCK_TIME_IS_VALID (val)) {
513 gst_segment_to_running_time_full (segment, GST_FORMAT_TIME, val, &val);
522 /* calculate the diff between running time on the sink and src of the queue.
523 * This is the total amount of time in the queue. */
525 update_time_level (GstQueue * queue)
527 gint64 sink_time, src_time;
529 if (queue->sink_tainted) {
530 GST_LOG_OBJECT (queue, "update sink time");
532 my_segment_to_running_time (&queue->sink_segment,
533 queue->sink_segment.position);
534 queue->sink_tainted = FALSE;
536 sink_time = queue->sinktime;
538 if (queue->src_tainted) {
539 GST_LOG_OBJECT (queue, "update src time");
541 my_segment_to_running_time (&queue->src_segment,
542 queue->src_segment.position);
543 queue->src_tainted = FALSE;
545 src_time = queue->srctime;
547 GST_LOG_OBJECT (queue, "sink %" GST_STIME_FORMAT ", src %" GST_STIME_FORMAT,
548 GST_STIME_ARGS (sink_time), GST_STIME_ARGS (src_time));
550 if (sink_time >= src_time)
551 queue->cur_level.time = sink_time - src_time;
553 queue->cur_level.time = 0;
556 /* take a SEGMENT event and apply the values to segment, updating the time
559 apply_segment (GstQueue * queue, GstEvent * event, GstSegment * segment,
562 gst_event_copy_segment (event, segment);
564 /* now configure the values, we use these to track timestamps on the
566 if (segment->format != GST_FORMAT_TIME) {
567 /* non-time format, pretent the current time segment is closed with a
568 * 0 start and unknown stop time. */
569 segment->format = GST_FORMAT_TIME;
575 queue->sink_tainted = TRUE;
577 queue->src_tainted = TRUE;
579 GST_DEBUG_OBJECT (queue, "configured SEGMENT %" GST_SEGMENT_FORMAT, segment);
581 /* segment can update the time level of the queue */
582 update_time_level (queue);
586 apply_gap (GstQueue * queue, GstEvent * event,
587 GstSegment * segment, gboolean is_sink)
589 GstClockTime timestamp;
590 GstClockTime duration;
592 gst_event_parse_gap (event, ×tamp, &duration);
594 if (GST_CLOCK_TIME_IS_VALID (timestamp)) {
596 if (GST_CLOCK_TIME_IS_VALID (duration)) {
597 timestamp += duration;
600 segment->position = timestamp;
603 queue->sink_tainted = TRUE;
605 queue->src_tainted = TRUE;
607 /* calc diff with other end */
608 update_time_level (queue);
613 /* take a buffer and update segment, updating the time level of the queue. */
615 apply_buffer (GstQueue * queue, GstBuffer * buffer, GstSegment * segment,
618 GstClockTime duration, timestamp;
620 timestamp = GST_BUFFER_DTS_OR_PTS (buffer);
621 duration = GST_BUFFER_DURATION (buffer);
623 /* if no timestamp is set, assume it's continuous with the previous
625 if (timestamp == GST_CLOCK_TIME_NONE)
626 timestamp = segment->position;
629 if (duration != GST_CLOCK_TIME_NONE)
630 timestamp += duration;
632 GST_LOG_OBJECT (queue, "%s position updated to %" GST_TIME_FORMAT,
633 segment == &queue->sink_segment ? "sink" : "src",
634 GST_TIME_ARGS (timestamp));
636 segment->position = timestamp;
638 queue->sink_tainted = TRUE;
640 queue->src_tainted = TRUE;
643 /* calc diff with other end */
644 update_time_level (queue);
648 buffer_list_apply_time (GstBuffer ** buf, guint idx, gpointer user_data)
650 GstClockTime *timestamp = user_data;
653 GST_TRACE ("buffer %u has pts %" GST_TIME_FORMAT " dts %" GST_TIME_FORMAT
654 " duration %" GST_TIME_FORMAT, idx, GST_TIME_ARGS (GST_BUFFER_DTS (*buf)),
655 GST_TIME_ARGS (GST_BUFFER_PTS (*buf)),
656 GST_TIME_ARGS (GST_BUFFER_DURATION (*buf)));
658 btime = GST_BUFFER_DTS_OR_PTS (*buf);
659 if (GST_CLOCK_TIME_IS_VALID (btime))
662 if (GST_BUFFER_DURATION_IS_VALID (*buf))
663 *timestamp += GST_BUFFER_DURATION (*buf);
665 GST_TRACE ("ts now %" GST_TIME_FORMAT, GST_TIME_ARGS (*timestamp));
670 /* take a buffer list and update segment, updating the time level of the queue */
672 apply_buffer_list (GstQueue * queue, GstBufferList * buffer_list,
673 GstSegment * segment, gboolean sink)
675 GstClockTime timestamp;
677 /* if no timestamp is set, assume it's continuous with the previous time */
678 timestamp = segment->position;
680 gst_buffer_list_foreach (buffer_list, buffer_list_apply_time, ×tamp);
682 GST_DEBUG_OBJECT (queue, "position updated to %" GST_TIME_FORMAT,
683 GST_TIME_ARGS (timestamp));
685 segment->position = timestamp;
688 queue->sink_tainted = TRUE;
690 queue->src_tainted = TRUE;
692 /* calc diff with other end */
693 update_time_level (queue);
697 gst_queue_locked_flush (GstQueue * queue, gboolean full)
701 while ((qitem = gst_queue_array_pop_head_struct (queue->queue))) {
702 /* Then lose another reference because we are supposed to destroy that
703 data when flushing */
704 if (!full && !qitem->is_query && GST_IS_EVENT (qitem->item)
705 && GST_EVENT_IS_STICKY (qitem->item)
706 && GST_EVENT_TYPE (qitem->item) != GST_EVENT_SEGMENT
707 && GST_EVENT_TYPE (qitem->item) != GST_EVENT_EOS) {
708 gst_pad_store_sticky_event (queue->srcpad, GST_EVENT_CAST (qitem->item));
710 if (!qitem->is_query)
711 gst_mini_object_unref (qitem->item);
712 memset (qitem, 0, sizeof (GstQueueItem));
714 queue->last_query = FALSE;
715 g_cond_signal (&queue->query_handled);
716 GST_QUEUE_CLEAR_LEVEL (queue->cur_level);
717 queue->min_threshold.buffers = queue->orig_min_threshold.buffers;
718 queue->min_threshold.bytes = queue->orig_min_threshold.bytes;
719 queue->min_threshold.time = queue->orig_min_threshold.time;
720 gst_segment_init (&queue->sink_segment, GST_FORMAT_TIME);
721 gst_segment_init (&queue->src_segment, GST_FORMAT_TIME);
722 queue->head_needs_discont = queue->tail_needs_discont = FALSE;
724 queue->sinktime = queue->srctime = GST_CLOCK_STIME_NONE;
725 queue->sink_tainted = queue->src_tainted = TRUE;
727 /* we deleted a lot of something */
728 GST_QUEUE_SIGNAL_DEL (queue);
731 /* enqueue an item an update the level stats, with QUEUE_LOCK */
733 gst_queue_locked_enqueue_buffer (GstQueue * queue, gpointer item)
736 GstBuffer *buffer = GST_BUFFER_CAST (item);
737 gsize bsize = gst_buffer_get_size (buffer);
739 /* add buffer to the statistics */
740 queue->cur_level.buffers++;
741 queue->cur_level.bytes += bsize;
742 apply_buffer (queue, buffer, &queue->sink_segment, TRUE);
745 qitem.is_query = FALSE;
747 gst_queue_array_push_tail_struct (queue->queue, &qitem);
748 GST_QUEUE_SIGNAL_ADD (queue);
752 gst_queue_locked_enqueue_buffer_list (GstQueue * queue, gpointer item)
755 GstBufferList *buffer_list = GST_BUFFER_LIST_CAST (item);
758 bsize = gst_buffer_list_calculate_size (buffer_list);
760 /* add buffer to the statistics */
761 queue->cur_level.buffers += gst_buffer_list_length (buffer_list);
762 queue->cur_level.bytes += bsize;
763 apply_buffer_list (queue, buffer_list, &queue->sink_segment, TRUE);
766 qitem.is_query = FALSE;
768 gst_queue_array_push_tail_struct (queue->queue, &qitem);
769 GST_QUEUE_SIGNAL_ADD (queue);
773 gst_queue_locked_enqueue_event (GstQueue * queue, gpointer item)
776 GstEvent *event = GST_EVENT_CAST (item);
778 switch (GST_EVENT_TYPE (event)) {
780 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "got EOS from upstream");
781 /* Zero the thresholds, this makes sure the queue is completely
782 * filled and we can read all data from the queue. */
783 if (queue->flush_on_eos)
784 gst_queue_locked_flush (queue, FALSE);
786 GST_QUEUE_CLEAR_LEVEL (queue->min_threshold);
787 /* mark the queue as EOS. This prevents us from accepting more data. */
790 case GST_EVENT_SEGMENT:
791 apply_segment (queue, event, &queue->sink_segment, TRUE);
792 /* if the queue is empty, apply sink segment on the source */
793 if (gst_queue_array_is_empty (queue->queue)) {
794 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "Apply segment on srcpad");
795 apply_segment (queue, event, &queue->src_segment, FALSE);
796 queue->newseg_applied_to_src = TRUE;
798 /* a new segment allows us to accept more buffers if we got EOS
800 queue->unexpected = FALSE;
803 apply_gap (queue, event, &queue->sink_segment, TRUE);
810 qitem.is_query = FALSE;
812 gst_queue_array_push_tail_struct (queue->queue, &qitem);
813 GST_QUEUE_SIGNAL_ADD (queue);
816 /* dequeue an item from the queue and update level stats, with QUEUE_LOCK */
817 static GstMiniObject *
818 gst_queue_locked_dequeue (GstQueue * queue)
824 qitem = gst_queue_array_pop_head_struct (queue->queue);
829 bufsize = qitem->size;
831 if (GST_IS_BUFFER (item)) {
832 GstBuffer *buffer = GST_BUFFER_CAST (item);
834 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
835 "retrieved buffer %p from queue", buffer);
837 queue->cur_level.buffers--;
838 queue->cur_level.bytes -= bufsize;
839 apply_buffer (queue, buffer, &queue->src_segment, FALSE);
841 /* if the queue is empty now, update the other side */
842 if (queue->cur_level.buffers == 0)
843 queue->cur_level.time = 0;
844 } else if (GST_IS_BUFFER_LIST (item)) {
845 GstBufferList *buffer_list = GST_BUFFER_LIST_CAST (item);
847 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
848 "retrieved buffer list %p from queue", buffer_list);
850 queue->cur_level.buffers -= gst_buffer_list_length (buffer_list);
851 queue->cur_level.bytes -= bufsize;
852 apply_buffer_list (queue, buffer_list, &queue->src_segment, FALSE);
854 /* if the queue is empty now, update the other side */
855 if (queue->cur_level.buffers == 0)
856 queue->cur_level.time = 0;
857 } else if (GST_IS_EVENT (item)) {
858 GstEvent *event = GST_EVENT_CAST (item);
860 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
861 "retrieved event %p from queue", event);
863 switch (GST_EVENT_TYPE (event)) {
865 /* queue is empty now that we dequeued the EOS */
866 GST_QUEUE_CLEAR_LEVEL (queue->cur_level);
868 case GST_EVENT_SEGMENT:
869 /* apply newsegment if it has not already been applied */
870 if (G_LIKELY (!queue->newseg_applied_to_src)) {
871 apply_segment (queue, event, &queue->src_segment, FALSE);
873 queue->newseg_applied_to_src = FALSE;
877 apply_gap (queue, event, &queue->src_segment, FALSE);
882 } else if (GST_IS_QUERY (item)) {
883 GstQuery *query = GST_QUERY_CAST (item);
885 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
886 "retrieved query %p from queue", query);
889 ("Unexpected item %p dequeued from queue %s (refcounting problem?)",
890 item, GST_OBJECT_NAME (queue));
893 GST_QUEUE_SIGNAL_DEL (queue);
900 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "the queue is empty");
906 gst_queue_handle_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
911 queue = GST_QUEUE (parent);
913 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "Received event '%s'",
914 GST_EVENT_TYPE_NAME (event));
916 switch (GST_EVENT_TYPE (event)) {
917 case GST_EVENT_FLUSH_START:
919 ret = gst_pad_push_event (queue->srcpad, event);
921 /* now unblock the chain function */
922 GST_QUEUE_MUTEX_LOCK (queue);
923 queue->srcresult = GST_FLOW_FLUSHING;
924 /* unblock the loop and chain functions */
925 GST_QUEUE_SIGNAL_ADD (queue);
926 GST_QUEUE_SIGNAL_DEL (queue);
927 GST_QUEUE_MUTEX_UNLOCK (queue);
929 /* make sure it pauses, this should happen since we sent
930 * flush_start downstream. */
931 gst_pad_pause_task (queue->srcpad);
932 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "loop stopped");
934 /* unblock query handler after the streaming thread is shut down.
935 * Otherwise downstream might have a query that is already unreffed
937 GST_QUEUE_MUTEX_LOCK (queue);
938 queue->last_query = FALSE;
939 g_cond_signal (&queue->query_handled);
940 GST_QUEUE_MUTEX_UNLOCK (queue);
942 case GST_EVENT_FLUSH_STOP:
944 ret = gst_pad_push_event (queue->srcpad, event);
946 GST_QUEUE_MUTEX_LOCK (queue);
947 gst_queue_locked_flush (queue, FALSE);
948 queue->srcresult = GST_FLOW_OK;
950 queue->unexpected = FALSE;
951 if (gst_pad_is_active (queue->srcpad)) {
952 gst_pad_start_task (queue->srcpad, (GstTaskFunction) gst_queue_loop,
953 queue->srcpad, NULL);
955 GST_INFO_OBJECT (queue->srcpad, "not re-starting task on srcpad, "
956 "pad not active any longer");
958 GST_QUEUE_MUTEX_UNLOCK (queue);
960 STATUS (queue, pad, "after flush");
963 if (GST_EVENT_IS_SERIALIZED (event)) {
964 /* serialized events go in the queue */
965 GST_QUEUE_MUTEX_LOCK (queue);
967 /* STREAM_START and SEGMENT reset the EOS status of a
968 * pad. Change the cached sinkpad flow result accordingly */
969 if (queue->srcresult == GST_FLOW_EOS
970 && (GST_EVENT_TYPE (event) == GST_EVENT_STREAM_START
971 || GST_EVENT_TYPE (event) == GST_EVENT_SEGMENT))
972 queue->srcresult = GST_FLOW_OK;
974 if (queue->srcresult != GST_FLOW_OK) {
975 /* Errors in sticky event pushing are no problem and ignored here
976 * as they will cause more meaningful errors during data flow.
977 * For EOS events, that are not followed by data flow, we still
978 * return FALSE here though and report an error.
980 if (!GST_EVENT_IS_STICKY (event)) {
981 GST_QUEUE_MUTEX_UNLOCK (queue);
983 } else if (GST_EVENT_TYPE (event) == GST_EVENT_EOS) {
984 if (queue->srcresult == GST_FLOW_NOT_LINKED
985 || queue->srcresult < GST_FLOW_EOS) {
986 GST_QUEUE_MUTEX_UNLOCK (queue);
987 GST_ELEMENT_FLOW_ERROR (queue, queue->srcresult);
989 GST_QUEUE_MUTEX_UNLOCK (queue);
995 /* refuse more events on EOS unless they unset the EOS status */
997 switch (GST_EVENT_TYPE (event)) {
998 case GST_EVENT_STREAM_START:
999 case GST_EVENT_SEGMENT:
1000 /* Restart the loop */
1001 if (GST_PAD_MODE (queue->srcpad) == GST_PAD_MODE_PUSH) {
1002 queue->srcresult = GST_FLOW_OK;
1004 queue->unexpected = FALSE;
1005 gst_pad_start_task (queue->srcpad,
1006 (GstTaskFunction) gst_queue_loop, queue->srcpad, NULL);
1009 queue->unexpected = FALSE;
1018 gst_queue_locked_enqueue_event (queue, event);
1019 GST_QUEUE_MUTEX_UNLOCK (queue);
1021 /* non-serialized events are forwarded downstream immediately */
1022 ret = gst_pad_push_event (queue->srcpad, event);
1027 GST_ERROR_OBJECT (queue, "Failed to push event");
1028 return GST_FLOW_ERROR;
1035 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "refusing event, we are EOS");
1036 GST_QUEUE_MUTEX_UNLOCK (queue);
1037 gst_event_unref (event);
1038 return GST_FLOW_EOS;
1042 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1043 "refusing event, we have a downstream flow error: %s",
1044 gst_flow_get_name (queue->srcresult));
1045 gst_event_unref (event);
1046 return queue->srcresult;
1051 gst_queue_handle_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
1053 GstQueue *queue = GST_QUEUE_CAST (parent);
1056 switch (GST_QUERY_TYPE (query)) {
1058 if (G_UNLIKELY (GST_QUERY_IS_SERIALIZED (query))) {
1061 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
1062 GST_LOG_OBJECT (queue, "queuing query %p (%s)", query,
1063 GST_QUERY_TYPE_NAME (query));
1064 qitem.item = GST_MINI_OBJECT_CAST (query);
1065 qitem.is_query = TRUE;
1067 gst_queue_array_push_tail_struct (queue->queue, &qitem);
1068 GST_QUEUE_SIGNAL_ADD (queue);
1069 while (queue->srcresult == GST_FLOW_OK &&
1070 queue->last_handled_query != query)
1071 g_cond_wait (&queue->query_handled, &queue->qlock);
1072 queue->last_handled_query = NULL;
1073 if (queue->srcresult != GST_FLOW_OK)
1075 res = queue->last_query;
1076 GST_QUEUE_MUTEX_UNLOCK (queue);
1078 res = gst_pad_query_default (pad, parent, query);
1087 GST_DEBUG_OBJECT (queue, "we are flushing");
1088 GST_QUEUE_MUTEX_UNLOCK (queue);
1094 gst_queue_is_empty (GstQueue * queue)
1098 head = gst_queue_array_peek_head_struct (queue->queue);
1103 /* Only consider the queue empty if the minimum thresholds
1104 * are not reached and data is at the queue head. Otherwise
1105 * we would block forever on serialized queries.
1107 if (!GST_IS_BUFFER (head->item) && !GST_IS_BUFFER_LIST (head->item))
1110 /* It is possible that a max size is reached before all min thresholds are.
1111 * Therefore, only consider it empty if it is not filled. */
1112 return ((queue->min_threshold.buffers > 0 &&
1113 queue->cur_level.buffers < queue->min_threshold.buffers) ||
1114 (queue->min_threshold.bytes > 0 &&
1115 queue->cur_level.bytes < queue->min_threshold.bytes) ||
1116 (queue->min_threshold.time > 0 &&
1117 queue->cur_level.time < queue->min_threshold.time)) &&
1118 !gst_queue_is_filled (queue);
1122 gst_queue_is_filled (GstQueue * queue)
1124 return (((queue->max_size.buffers > 0 &&
1125 queue->cur_level.buffers >= queue->max_size.buffers) ||
1126 (queue->max_size.bytes > 0 &&
1127 queue->cur_level.bytes >= queue->max_size.bytes) ||
1128 (queue->max_size.time > 0 &&
1129 queue->cur_level.time >= queue->max_size.time)));
1133 gst_queue_leak_downstream (GstQueue * queue)
1135 /* for as long as the queue is filled, dequeue an item and discard it */
1136 while (gst_queue_is_filled (queue)) {
1137 GstMiniObject *leak;
1139 leak = gst_queue_locked_dequeue (queue);
1140 /* there is nothing to dequeue and the queue is still filled.. This should
1142 g_assert (leak != NULL);
1144 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
1145 "queue is full, leaking item %p on downstream end", leak);
1146 if (GST_IS_EVENT (leak) && GST_EVENT_IS_STICKY (leak)) {
1147 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
1148 "Storing sticky event %s on srcpad", GST_EVENT_TYPE_NAME (leak));
1149 gst_pad_store_sticky_event (queue->srcpad, GST_EVENT_CAST (leak));
1152 if (!GST_IS_QUERY (leak))
1153 gst_mini_object_unref (leak);
1155 /* last buffer needs to get a DISCONT flag */
1156 queue->head_needs_discont = TRUE;
1161 discont_first_buffer (GstBuffer ** buffer, guint i, gpointer user_data)
1163 GstQueue *queue = user_data;
1164 GstBuffer *subbuffer = gst_buffer_make_writable (*buffer);
1167 *buffer = subbuffer;
1168 GST_BUFFER_FLAG_SET (*buffer, GST_BUFFER_FLAG_DISCONT);
1170 GST_DEBUG_OBJECT (queue, "Could not mark buffer as DISCONT");
1176 static GstFlowReturn
1177 gst_queue_chain_buffer_or_list (GstPad * pad, GstObject * parent,
1178 GstMiniObject * obj, gboolean is_list)
1182 queue = GST_QUEUE_CAST (parent);
1184 /* we have to lock the queue since we span threads */
1185 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
1186 /* when we received EOS, we refuse any more data */
1189 if (queue->unexpected)
1190 goto out_unexpected;
1193 GstClockTime duration, timestamp;
1194 GstBuffer *buffer = GST_BUFFER_CAST (obj);
1196 timestamp = GST_BUFFER_DTS_OR_PTS (buffer);
1197 duration = GST_BUFFER_DURATION (buffer);
1199 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "received buffer %p of size %"
1200 G_GSIZE_FORMAT ", time %" GST_TIME_FORMAT ", duration %"
1201 GST_TIME_FORMAT, buffer, gst_buffer_get_size (buffer),
1202 GST_TIME_ARGS (timestamp), GST_TIME_ARGS (duration));
1204 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1205 "received buffer list %p with %u buffers", obj,
1206 gst_buffer_list_length (GST_BUFFER_LIST_CAST (obj)));
1209 /* We make space available if we're "full" according to whatever
1210 * the user defined as "full". Note that this only applies to buffers.
1211 * We always handle events and they don't count in our statistics. */
1212 while (gst_queue_is_filled (queue)) {
1213 if (!queue->silent) {
1214 GST_QUEUE_MUTEX_UNLOCK (queue);
1215 g_signal_emit (queue, gst_queue_signals[SIGNAL_OVERRUN], 0);
1216 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
1217 /* we recheck, the signal could have changed the thresholds */
1218 if (!gst_queue_is_filled (queue))
1222 /* how are we going to make space for this buffer? */
1223 switch (queue->leaky) {
1224 case GST_QUEUE_LEAK_UPSTREAM:
1225 /* next buffer needs to get a DISCONT flag */
1226 queue->tail_needs_discont = TRUE;
1227 /* leak current buffer */
1228 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
1229 "queue is full, leaking buffer on upstream end");
1230 /* now we can clean up and exit right away */
1232 case GST_QUEUE_LEAK_DOWNSTREAM:
1233 gst_queue_leak_downstream (queue);
1236 g_warning ("Unknown leaky type, using default");
1238 case GST_QUEUE_NO_LEAK:
1240 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
1241 "queue is full, waiting for free space");
1243 /* don't leak. Instead, wait for space to be available */
1245 /* for as long as the queue is filled, wait till an item was deleted. */
1246 GST_QUEUE_WAIT_DEL_CHECK (queue, out_flushing);
1247 } while (gst_queue_is_filled (queue));
1249 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "queue is not full");
1251 if (!queue->silent) {
1252 GST_QUEUE_MUTEX_UNLOCK (queue);
1253 g_signal_emit (queue, gst_queue_signals[SIGNAL_RUNNING], 0);
1254 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
1261 if (queue->tail_needs_discont) {
1263 GstBuffer *buffer = GST_BUFFER_CAST (obj);
1264 GstBuffer *subbuffer = gst_buffer_make_writable (buffer);
1268 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1270 GST_DEBUG_OBJECT (queue, "Could not mark buffer as DISCONT");
1273 obj = GST_MINI_OBJECT_CAST (buffer);
1275 GstBufferList *buffer_list = GST_BUFFER_LIST_CAST (obj);
1277 buffer_list = gst_buffer_list_make_writable (buffer_list);
1278 gst_buffer_list_foreach (buffer_list, discont_first_buffer, queue);
1279 obj = GST_MINI_OBJECT_CAST (buffer_list);
1281 queue->tail_needs_discont = FALSE;
1284 /* put buffer in queue now */
1286 gst_queue_locked_enqueue_buffer_list (queue, obj);
1288 gst_queue_locked_enqueue_buffer (queue, obj);
1289 GST_QUEUE_MUTEX_UNLOCK (queue);
1293 /* special conditions */
1296 GST_QUEUE_MUTEX_UNLOCK (queue);
1298 gst_mini_object_unref (obj);
1304 GstFlowReturn ret = queue->srcresult;
1306 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1307 "exit because task paused, reason: %s", gst_flow_get_name (ret));
1308 GST_QUEUE_MUTEX_UNLOCK (queue);
1309 gst_mini_object_unref (obj);
1315 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "exit because we received EOS");
1316 GST_QUEUE_MUTEX_UNLOCK (queue);
1318 gst_mini_object_unref (obj);
1320 return GST_FLOW_EOS;
1324 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "exit because we received EOS");
1325 GST_QUEUE_MUTEX_UNLOCK (queue);
1327 gst_mini_object_unref (obj);
1329 return GST_FLOW_EOS;
1333 static GstFlowReturn
1334 gst_queue_chain_list (GstPad * pad, GstObject * parent,
1335 GstBufferList * buffer_list)
1337 return gst_queue_chain_buffer_or_list (pad, parent,
1338 GST_MINI_OBJECT_CAST (buffer_list), TRUE);
1341 static GstFlowReturn
1342 gst_queue_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
1344 return gst_queue_chain_buffer_or_list (pad, parent,
1345 GST_MINI_OBJECT_CAST (buffer), FALSE);
1348 /* dequeue an item from the queue an push it downstream. This functions returns
1349 * the result of the push. */
1350 static GstFlowReturn
1351 gst_queue_push_one (GstQueue * queue)
1353 GstFlowReturn result = queue->srcresult;
1354 GstMiniObject *data;
1357 data = gst_queue_locked_dequeue (queue);
1362 is_list = GST_IS_BUFFER_LIST (data);
1364 if (GST_IS_BUFFER (data) || is_list) {
1368 buffer = GST_BUFFER_CAST (data);
1370 if (queue->head_needs_discont) {
1371 GstBuffer *subbuffer = gst_buffer_make_writable (buffer);
1375 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1377 GST_DEBUG_OBJECT (queue, "Could not mark buffer as DISCONT");
1379 queue->head_needs_discont = FALSE;
1382 GST_QUEUE_MUTEX_UNLOCK (queue);
1383 result = gst_pad_push (queue->srcpad, buffer);
1385 GstBufferList *buffer_list;
1387 buffer_list = GST_BUFFER_LIST_CAST (data);
1389 if (queue->head_needs_discont) {
1390 buffer_list = gst_buffer_list_make_writable (buffer_list);
1391 gst_buffer_list_foreach (buffer_list, discont_first_buffer, queue);
1392 queue->head_needs_discont = FALSE;
1395 GST_QUEUE_MUTEX_UNLOCK (queue);
1396 result = gst_pad_push_list (queue->srcpad, buffer_list);
1399 /* need to check for srcresult here as well */
1400 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
1402 if (result == GST_FLOW_EOS) {
1403 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "got EOS from downstream");
1404 /* stop pushing buffers, we dequeue all items until we see an item that we
1405 * can push again, which is EOS or SEGMENT. If there is nothing in the
1406 * queue we can push, we set a flag to make the sinkpad refuse more
1407 * buffers with an EOS return value. */
1408 while ((data = gst_queue_locked_dequeue (queue))) {
1409 if (GST_IS_BUFFER (data)) {
1410 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1411 "dropping EOS buffer %p", data);
1412 gst_buffer_unref (GST_BUFFER_CAST (data));
1413 } else if (GST_IS_BUFFER_LIST (data)) {
1414 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1415 "dropping EOS buffer list %p", data);
1416 gst_buffer_list_unref (GST_BUFFER_LIST_CAST (data));
1417 } else if (GST_IS_EVENT (data)) {
1418 GstEvent *event = GST_EVENT_CAST (data);
1419 GstEventType type = GST_EVENT_TYPE (event);
1421 if (type == GST_EVENT_EOS || type == GST_EVENT_SEGMENT
1422 || type == GST_EVENT_STREAM_START) {
1423 /* we found a pushable item in the queue, push it out */
1424 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1425 "pushing pushable event %s after EOS",
1426 GST_EVENT_TYPE_NAME (event));
1429 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1430 "dropping EOS event %p", event);
1431 gst_event_unref (event);
1432 } else if (GST_IS_QUERY (data)) {
1433 GstQuery *query = GST_QUERY_CAST (data);
1435 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1436 "dropping query %p because of EOS", query);
1437 queue->last_query = FALSE;
1438 g_cond_signal (&queue->query_handled);
1441 /* no more items in the queue. Set the unexpected flag so that upstream
1442 * make us refuse any more buffers on the sinkpad. Since we will still
1443 * accept EOS and SEGMENT we return _FLOW_OK to the caller so that the
1444 * task function does not shut down. */
1445 queue->unexpected = TRUE;
1446 result = GST_FLOW_OK;
1448 } else if (GST_IS_EVENT (data)) {
1449 GstEvent *event = GST_EVENT_CAST (data);
1450 GstEventType type = GST_EVENT_TYPE (event);
1452 GST_QUEUE_MUTEX_UNLOCK (queue);
1454 gst_pad_push_event (queue->srcpad, event);
1456 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
1457 /* if we're EOS, return EOS so that the task pauses. */
1458 if (type == GST_EVENT_EOS) {
1459 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1460 "pushed EOS event %p, return EOS", event);
1461 result = GST_FLOW_EOS;
1463 } else if (GST_IS_QUERY (data)) {
1464 GstQuery *query = GST_QUERY_CAST (data);
1467 GST_QUEUE_MUTEX_UNLOCK (queue);
1468 ret = gst_pad_peer_query (queue->srcpad, query);
1469 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing_query);
1470 queue->last_query = ret;
1471 queue->last_handled_query = query;
1472 g_cond_signal (&queue->query_handled);
1473 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1474 "did query %p, return %d", query, queue->last_query);
1481 GST_CAT_ERROR_OBJECT (queue_dataflow, queue,
1482 "exit because we have no item in the queue");
1483 return GST_FLOW_ERROR;
1487 GstFlowReturn ret = queue->srcresult;
1488 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1489 "exit because task paused, reason: %s", gst_flow_get_name (ret));
1494 GstFlowReturn ret = queue->srcresult;
1495 queue->last_query = FALSE;
1496 g_cond_signal (&queue->query_handled);
1497 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1498 "exit because task paused, reason: %s", gst_flow_get_name (ret));
1504 gst_queue_loop (GstPad * pad)
1509 queue = (GstQueue *) GST_PAD_PARENT (pad);
1511 /* have to lock for thread-safety */
1512 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
1514 while (gst_queue_is_empty (queue)) {
1515 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "queue is empty");
1516 if (!queue->silent) {
1517 GST_QUEUE_MUTEX_UNLOCK (queue);
1518 g_signal_emit (queue, gst_queue_signals[SIGNAL_UNDERRUN], 0);
1519 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
1522 /* we recheck, the signal could have changed the thresholds */
1523 while (gst_queue_is_empty (queue)) {
1524 GST_QUEUE_WAIT_ADD_CHECK (queue, out_flushing);
1527 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "queue is not empty");
1528 if (!queue->silent) {
1529 GST_QUEUE_MUTEX_UNLOCK (queue);
1530 g_signal_emit (queue, gst_queue_signals[SIGNAL_RUNNING], 0);
1531 g_signal_emit (queue, gst_queue_signals[SIGNAL_PUSHING], 0);
1532 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
1536 ret = gst_queue_push_one (queue);
1537 queue->srcresult = ret;
1538 if (ret != GST_FLOW_OK)
1541 GST_QUEUE_MUTEX_UNLOCK (queue);
1548 gboolean eos = queue->eos;
1549 GstFlowReturn ret = queue->srcresult;
1551 gst_pad_pause_task (queue->srcpad);
1552 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1553 "pause task, reason: %s", gst_flow_get_name (ret));
1554 if (ret == GST_FLOW_FLUSHING) {
1555 gst_queue_locked_flush (queue, FALSE);
1557 GST_QUEUE_SIGNAL_DEL (queue);
1558 queue->last_query = FALSE;
1559 g_cond_signal (&queue->query_handled);
1561 GST_QUEUE_MUTEX_UNLOCK (queue);
1562 /* let app know about us giving up if upstream is not expected to do so */
1563 /* EOS is already taken care of elsewhere */
1564 if (eos && (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS)) {
1565 GST_ELEMENT_FLOW_ERROR (queue, ret);
1566 gst_pad_push_event (queue->srcpad, gst_event_new_eos ());
1573 gst_queue_handle_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1575 gboolean res = TRUE;
1576 GstQueue *queue = GST_QUEUE (parent);
1578 #ifndef GST_DISABLE_GST_DEBUG
1579 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "got event %p (%d)",
1580 event, GST_EVENT_TYPE (event));
1583 switch (GST_EVENT_TYPE (event)) {
1584 case GST_EVENT_RECONFIGURE:
1585 GST_QUEUE_MUTEX_LOCK (queue);
1586 if (queue->srcresult == GST_FLOW_NOT_LINKED) {
1587 /* when we got not linked, assume downstream is linked again now and we
1588 * can try to start pushing again */
1589 queue->srcresult = GST_FLOW_OK;
1590 gst_pad_start_task (pad, (GstTaskFunction) gst_queue_loop, pad, NULL);
1592 GST_QUEUE_MUTEX_UNLOCK (queue);
1594 res = gst_pad_push_event (queue->sinkpad, event);
1597 res = gst_pad_event_default (pad, parent, event);
1606 gst_queue_handle_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
1608 GstQueue *queue = GST_QUEUE (parent);
1611 switch (GST_QUERY_TYPE (query)) {
1612 case GST_QUERY_SCHEDULING:{
1613 gst_query_add_scheduling_mode (query, GST_PAD_MODE_PUSH);
1618 res = gst_pad_query_default (pad, parent, query);
1625 /* Adjust peer response for data contained in queue */
1626 switch (GST_QUERY_TYPE (query)) {
1627 case GST_QUERY_POSITION:
1632 /* get peer position */
1633 gst_query_parse_position (query, &format, &peer_pos);
1635 /* FIXME: this code assumes that there's no discont in the queue */
1637 case GST_FORMAT_BYTES:
1638 peer_pos -= queue->cur_level.bytes;
1639 if (peer_pos < 0) /* Clamp result to 0 */
1642 case GST_FORMAT_TIME:
1643 peer_pos -= queue->cur_level.time;
1644 if (peer_pos < 0) /* Clamp result to 0 */
1648 GST_DEBUG_OBJECT (queue, "Can't adjust query in %s format, don't "
1649 "know how to adjust value", gst_format_get_name (format));
1652 /* set updated position */
1653 gst_query_set_position (query, format, peer_pos);
1656 case GST_QUERY_LATENCY:
1659 GstClockTime min, max;
1661 gst_query_parse_latency (query, &live, &min, &max);
1663 /* we can delay up to the limit of the queue in time. If we have no time
1664 * limit, the best thing we can do is to return an infinite delay. In
1665 * reality a better estimate would be the byte/buffer rate but that is not
1666 * possible right now. */
1667 /* TODO: Use CONVERT query? */
1668 if (queue->max_size.time > 0 && max != -1
1669 && queue->leaky == GST_QUEUE_NO_LEAK)
1670 max += queue->max_size.time;
1671 else if (queue->max_size.time > 0 && queue->leaky != GST_QUEUE_NO_LEAK)
1672 max = MIN (queue->max_size.time, max);
1676 /* adjust for min-threshold */
1677 if (queue->min_threshold.time > 0)
1678 min += queue->min_threshold.time;
1680 gst_query_set_latency (query, live, min, max);
1684 /* peer handled other queries */
1692 gst_queue_sink_activate_mode (GstPad * pad, GstObject * parent, GstPadMode mode,
1698 queue = GST_QUEUE (parent);
1701 case GST_PAD_MODE_PUSH:
1703 GST_QUEUE_MUTEX_LOCK (queue);
1704 queue->srcresult = GST_FLOW_OK;
1706 queue->unexpected = FALSE;
1707 GST_QUEUE_MUTEX_UNLOCK (queue);
1709 /* step 1, unblock chain function */
1710 GST_QUEUE_MUTEX_LOCK (queue);
1711 queue->srcresult = GST_FLOW_FLUSHING;
1712 /* the item del signal will unblock */
1713 GST_QUEUE_SIGNAL_DEL (queue);
1714 GST_QUEUE_MUTEX_UNLOCK (queue);
1716 /* step 2, wait until streaming thread stopped and flush queue */
1717 GST_PAD_STREAM_LOCK (pad);
1718 GST_QUEUE_MUTEX_LOCK (queue);
1719 gst_queue_locked_flush (queue, TRUE);
1720 GST_QUEUE_MUTEX_UNLOCK (queue);
1721 GST_PAD_STREAM_UNLOCK (pad);
1733 gst_queue_src_activate_mode (GstPad * pad, GstObject * parent, GstPadMode mode,
1739 queue = GST_QUEUE (parent);
1742 case GST_PAD_MODE_PUSH:
1744 GST_QUEUE_MUTEX_LOCK (queue);
1745 queue->srcresult = GST_FLOW_OK;
1747 queue->unexpected = FALSE;
1749 gst_pad_start_task (pad, (GstTaskFunction) gst_queue_loop, pad,
1751 GST_QUEUE_MUTEX_UNLOCK (queue);
1753 /* step 1, unblock loop function */
1754 GST_QUEUE_MUTEX_LOCK (queue);
1755 queue->srcresult = GST_FLOW_FLUSHING;
1756 /* the item add signal will unblock */
1757 g_cond_signal (&queue->item_add);
1758 GST_QUEUE_MUTEX_UNLOCK (queue);
1760 /* step 2, make sure streaming finishes */
1761 result = gst_pad_stop_task (pad);
1763 GST_QUEUE_MUTEX_LOCK (queue);
1764 gst_queue_locked_flush (queue, FALSE);
1765 GST_QUEUE_MUTEX_UNLOCK (queue);
1776 queue_capacity_change (GstQueue * queue)
1778 if (queue->leaky == GST_QUEUE_LEAK_DOWNSTREAM) {
1779 gst_queue_leak_downstream (queue);
1782 /* changing the capacity of the queue must wake up
1783 * the _chain function, it might have more room now
1784 * to store the buffer/event in the queue */
1785 GST_QUEUE_SIGNAL_DEL (queue);
1788 /* Changing the minimum required fill level must
1789 * wake up the _loop function as it might now
1790 * be able to preceed.
1792 #define QUEUE_THRESHOLD_CHANGE(q)\
1793 GST_QUEUE_SIGNAL_ADD (q);
1796 gst_queue_set_property (GObject * object,
1797 guint prop_id, const GValue * value, GParamSpec * pspec)
1799 GstQueue *queue = GST_QUEUE (object);
1801 /* someone could change levels here, and since this
1802 * affects the get/put funcs, we need to lock for safety. */
1803 GST_QUEUE_MUTEX_LOCK (queue);
1806 case PROP_MAX_SIZE_BYTES:
1807 queue->max_size.bytes = g_value_get_uint (value);
1808 queue_capacity_change (queue);
1810 case PROP_MAX_SIZE_BUFFERS:
1811 queue->max_size.buffers = g_value_get_uint (value);
1812 queue_capacity_change (queue);
1814 case PROP_MAX_SIZE_TIME:
1815 queue->max_size.time = g_value_get_uint64 (value);
1816 queue_capacity_change (queue);
1818 case PROP_MIN_THRESHOLD_BYTES:
1819 queue->min_threshold.bytes = g_value_get_uint (value);
1820 queue->orig_min_threshold.bytes = queue->min_threshold.bytes;
1821 QUEUE_THRESHOLD_CHANGE (queue);
1823 case PROP_MIN_THRESHOLD_BUFFERS:
1824 queue->min_threshold.buffers = g_value_get_uint (value);
1825 queue->orig_min_threshold.buffers = queue->min_threshold.buffers;
1826 QUEUE_THRESHOLD_CHANGE (queue);
1828 case PROP_MIN_THRESHOLD_TIME:
1829 queue->min_threshold.time = g_value_get_uint64 (value);
1830 queue->orig_min_threshold.time = queue->min_threshold.time;
1831 QUEUE_THRESHOLD_CHANGE (queue);
1834 queue->leaky = g_value_get_enum (value);
1837 queue->silent = g_value_get_boolean (value);
1839 case PROP_FLUSH_ON_EOS:
1840 queue->flush_on_eos = g_value_get_boolean (value);
1843 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1847 GST_QUEUE_MUTEX_UNLOCK (queue);
1851 gst_queue_get_property (GObject * object,
1852 guint prop_id, GValue * value, GParamSpec * pspec)
1854 GstQueue *queue = GST_QUEUE (object);
1856 GST_QUEUE_MUTEX_LOCK (queue);
1859 case PROP_CUR_LEVEL_BYTES:
1860 g_value_set_uint (value, queue->cur_level.bytes);
1862 case PROP_CUR_LEVEL_BUFFERS:
1863 g_value_set_uint (value, queue->cur_level.buffers);
1865 case PROP_CUR_LEVEL_TIME:
1866 g_value_set_uint64 (value, queue->cur_level.time);
1868 case PROP_MAX_SIZE_BYTES:
1869 g_value_set_uint (value, queue->max_size.bytes);
1871 case PROP_MAX_SIZE_BUFFERS:
1872 g_value_set_uint (value, queue->max_size.buffers);
1874 case PROP_MAX_SIZE_TIME:
1875 g_value_set_uint64 (value, queue->max_size.time);
1877 case PROP_MIN_THRESHOLD_BYTES:
1878 g_value_set_uint (value, queue->min_threshold.bytes);
1880 case PROP_MIN_THRESHOLD_BUFFERS:
1881 g_value_set_uint (value, queue->min_threshold.buffers);
1883 case PROP_MIN_THRESHOLD_TIME:
1884 g_value_set_uint64 (value, queue->min_threshold.time);
1887 g_value_set_enum (value, queue->leaky);
1890 g_value_set_boolean (value, queue->silent);
1892 case PROP_FLUSH_ON_EOS:
1893 g_value_set_boolean (value, queue->flush_on_eos);
1896 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1900 GST_QUEUE_MUTEX_UNLOCK (queue);