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
28 * Data is queued until one of the limits specified by the
29 * #GstQueue:max-size-buffers, #GstQueue:max-size-bytes and/or
30 * #GstQueue:max-size-time properties has been reached. Any attempt to push
31 * more buffers into the queue will block the pushing thread until more space
34 * The queue will create a new thread on the source pad to decouple the
35 * processing on sink and source pad.
37 * You can query how many buffers are queued by reading the
38 * #GstQueue:current-level-buffers property. You can track changes
39 * by connecting to the notify::current-level-buffers signal (which
40 * like all signals will be emitted from the streaming thread). The same
41 * applies to the #GstQueue:current-level-time and
42 * #GstQueue:current-level-bytes properties.
44 * The default queue size limits are 200 buffers, 10MB of data, or
45 * one second worth of data, whichever is reached first.
47 * As said earlier, the queue blocks by default when one of the specified
48 * maximums (bytes, time, buffers) has been reached. You can set the
49 * #GstQueue:leaky property to specify that instead of blocking it should
50 * leak (drop) new or old buffers.
52 * The #GstQueue::underrun signal is emitted when the queue has less data than
53 * the specified minimum thresholds require (by default: when the queue is
54 * empty). The #GstQueue::overrun signal is emitted when the queue is filled
55 * up. Both signals are emitted from the context of the streaming thread.
58 #include "gst/gst_private.h"
63 #include "../../gst/gst-i18n-lib.h"
64 #include "../../gst/glib-compat-private.h"
66 static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
71 static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
76 GST_DEBUG_CATEGORY_STATIC (queue_debug);
77 #define GST_CAT_DEFAULT (queue_debug)
78 GST_DEBUG_CATEGORY_STATIC (queue_dataflow);
80 #define STATUS(queue, pad, msg) \
81 GST_CAT_LOG_OBJECT (queue_dataflow, queue, \
82 "(%s:%s) " msg ": %u of %u-%u buffers, %u of %u-%u " \
83 "bytes, %" G_GUINT64_FORMAT " of %" G_GUINT64_FORMAT \
84 "-%" G_GUINT64_FORMAT " ns, %u items", \
85 GST_DEBUG_PAD_NAME (pad), \
86 queue->cur_level.buffers, \
87 queue->min_threshold.buffers, \
88 queue->max_size.buffers, \
89 queue->cur_level.bytes, \
90 queue->min_threshold.bytes, \
91 queue->max_size.bytes, \
92 queue->cur_level.time, \
93 queue->min_threshold.time, \
94 queue->max_size.time, \
95 gst_queue_array_get_length (queue->queue))
97 /* Queue signals and args */
110 /* FIXME: don't we have another way of doing this
111 * "Gstreamer format" (frame/byte/time) queries? */
112 PROP_CUR_LEVEL_BUFFERS,
113 PROP_CUR_LEVEL_BYTES,
115 PROP_MAX_SIZE_BUFFERS,
118 PROP_MIN_THRESHOLD_BUFFERS,
119 PROP_MIN_THRESHOLD_BYTES,
120 PROP_MIN_THRESHOLD_TIME,
126 /* default property values */
127 #define DEFAULT_MAX_SIZE_BUFFERS 200 /* 200 buffers */
128 #define DEFAULT_MAX_SIZE_BYTES (10 * 1024 * 1024) /* 10 MB */
129 #define DEFAULT_MAX_SIZE_TIME GST_SECOND /* 1 second */
131 #define GST_QUEUE_MUTEX_LOCK(q) G_STMT_START { \
132 g_mutex_lock (&q->qlock); \
135 #define GST_QUEUE_MUTEX_LOCK_CHECK(q,label) G_STMT_START { \
136 GST_QUEUE_MUTEX_LOCK (q); \
137 if (q->srcresult != GST_FLOW_OK) \
141 #define GST_QUEUE_MUTEX_UNLOCK(q) G_STMT_START { \
142 g_mutex_unlock (&q->qlock); \
145 #define GST_QUEUE_WAIT_DEL_CHECK(q, label) G_STMT_START { \
146 STATUS (q, q->sinkpad, "wait for DEL"); \
147 q->waiting_del = TRUE; \
148 g_cond_wait (&q->item_del, &q->qlock); \
149 q->waiting_del = FALSE; \
150 if (q->srcresult != GST_FLOW_OK) { \
151 STATUS (q, q->srcpad, "received DEL wakeup"); \
154 STATUS (q, q->sinkpad, "received DEL"); \
157 #define GST_QUEUE_WAIT_ADD_CHECK(q, label) G_STMT_START { \
158 STATUS (q, q->srcpad, "wait for ADD"); \
159 q->waiting_add = TRUE; \
160 g_cond_wait (&q->item_add, &q->qlock); \
161 q->waiting_add = FALSE; \
162 if (q->srcresult != GST_FLOW_OK) { \
163 STATUS (q, q->srcpad, "received ADD wakeup"); \
166 STATUS (q, q->srcpad, "received ADD"); \
169 #define GST_QUEUE_SIGNAL_DEL(q) G_STMT_START { \
170 if (q->waiting_del) { \
171 STATUS (q, q->srcpad, "signal DEL"); \
172 g_cond_signal (&q->item_del); \
176 #define GST_QUEUE_SIGNAL_ADD(q) G_STMT_START { \
177 if (q->waiting_add) { \
178 STATUS (q, q->sinkpad, "signal ADD"); \
179 g_cond_signal (&q->item_add); \
184 GST_DEBUG_CATEGORY_INIT (queue_debug, "queue", 0, "queue element"); \
185 GST_DEBUG_CATEGORY_INIT (queue_dataflow, "queue_dataflow", 0, \
186 "dataflow inside the queue element");
187 #define gst_queue_parent_class parent_class
188 G_DEFINE_TYPE_WITH_CODE (GstQueue, gst_queue, GST_TYPE_ELEMENT, _do_init);
190 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_push_one (GstQueue * queue);
200 static void gst_queue_loop (GstPad * pad);
202 static gboolean gst_queue_handle_sink_event (GstPad * pad, GstObject * parent,
204 static gboolean gst_queue_handle_sink_query (GstPad * pad, GstObject * parent,
207 static gboolean gst_queue_handle_src_event (GstPad * pad, GstObject * parent,
209 static gboolean gst_queue_handle_src_query (GstPad * pad, GstObject * parent,
212 static void gst_queue_locked_flush (GstQueue * queue, gboolean full);
214 static gboolean gst_queue_src_activate_mode (GstPad * pad, GstObject * parent,
215 GstPadMode mode, gboolean active);
216 static gboolean gst_queue_sink_activate_mode (GstPad * pad, GstObject * parent,
217 GstPadMode mode, gboolean active);
219 static gboolean gst_queue_is_empty (GstQueue * queue);
220 static gboolean gst_queue_is_filled (GstQueue * queue);
229 #define GST_TYPE_QUEUE_LEAKY (queue_leaky_get_type ())
232 queue_leaky_get_type (void)
234 static GType queue_leaky_type = 0;
235 static const GEnumValue queue_leaky[] = {
236 {GST_QUEUE_NO_LEAK, "Not Leaky", "no"},
237 {GST_QUEUE_LEAK_UPSTREAM, "Leaky on upstream (new buffers)", "upstream"},
238 {GST_QUEUE_LEAK_DOWNSTREAM, "Leaky on downstream (old buffers)",
243 if (!queue_leaky_type) {
244 queue_leaky_type = g_enum_register_static ("GstQueueLeaky", queue_leaky);
246 return queue_leaky_type;
249 static guint gst_queue_signals[LAST_SIGNAL] = { 0 };
252 gst_queue_class_init (GstQueueClass * klass)
254 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
255 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
257 gobject_class->set_property = gst_queue_set_property;
258 gobject_class->get_property = gst_queue_get_property;
262 * GstQueue::underrun:
263 * @queue: the queue instance
265 * Reports that the buffer became empty (underrun).
266 * A buffer is empty if the total amount of data inside it (num-buffers, time,
267 * size) is lower than the boundary values which can be set through the
268 * GObject properties.
270 gst_queue_signals[SIGNAL_UNDERRUN] =
271 g_signal_new ("underrun", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
272 G_STRUCT_OFFSET (GstQueueClass, underrun), NULL, NULL,
273 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
276 * @queue: the queue instance
278 * Reports that enough (min-threshold) data is in the queue. Use this signal
279 * together with the underrun signal to pause the pipeline on underrun and
280 * wait for the queue to fill-up before resume playback.
282 gst_queue_signals[SIGNAL_RUNNING] =
283 g_signal_new ("running", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
284 G_STRUCT_OFFSET (GstQueueClass, running), NULL, NULL,
285 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
288 * @queue: the queue instance
290 * Reports that the buffer became full (overrun).
291 * A buffer is full if the total amount of data inside it (num-buffers, time,
292 * size) is higher than the boundary values which can be set through the
293 * GObject properties.
295 gst_queue_signals[SIGNAL_OVERRUN] =
296 g_signal_new ("overrun", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
297 G_STRUCT_OFFSET (GstQueueClass, overrun), NULL, NULL,
298 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
301 * @queue: the queue instance
303 * Reports when the queue has enough data to start pushing data again on the
306 gst_queue_signals[SIGNAL_PUSHING] =
307 g_signal_new ("pushing", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
308 G_STRUCT_OFFSET (GstQueueClass, pushing), NULL, NULL,
309 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
312 g_object_class_install_property (gobject_class, PROP_CUR_LEVEL_BYTES,
313 g_param_spec_uint ("current-level-bytes", "Current level (kB)",
314 "Current amount of data in the queue (bytes)",
315 0, G_MAXUINT, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
316 g_object_class_install_property (gobject_class, PROP_CUR_LEVEL_BUFFERS,
317 g_param_spec_uint ("current-level-buffers", "Current level (buffers)",
318 "Current number of buffers in the queue",
319 0, G_MAXUINT, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
320 g_object_class_install_property (gobject_class, PROP_CUR_LEVEL_TIME,
321 g_param_spec_uint64 ("current-level-time", "Current level (ns)",
322 "Current amount of data in the queue (in ns)",
323 0, G_MAXUINT64, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
325 g_object_class_install_property (gobject_class, PROP_MAX_SIZE_BYTES,
326 g_param_spec_uint ("max-size-bytes", "Max. size (kB)",
327 "Max. amount of data in the queue (bytes, 0=disable)",
328 0, G_MAXUINT, DEFAULT_MAX_SIZE_BYTES,
329 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
330 g_object_class_install_property (gobject_class, PROP_MAX_SIZE_BUFFERS,
331 g_param_spec_uint ("max-size-buffers", "Max. size (buffers)",
332 "Max. number of buffers in the queue (0=disable)", 0, G_MAXUINT,
333 DEFAULT_MAX_SIZE_BUFFERS,
334 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
335 g_object_class_install_property (gobject_class, PROP_MAX_SIZE_TIME,
336 g_param_spec_uint64 ("max-size-time", "Max. size (ns)",
337 "Max. amount of data in the queue (in ns, 0=disable)", 0, G_MAXUINT64,
338 DEFAULT_MAX_SIZE_TIME, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
340 g_object_class_install_property (gobject_class, PROP_MIN_THRESHOLD_BYTES,
341 g_param_spec_uint ("min-threshold-bytes", "Min. threshold (kB)",
342 "Min. amount of data in the queue to allow reading (bytes, 0=disable)",
343 0, G_MAXUINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
344 g_object_class_install_property (gobject_class, PROP_MIN_THRESHOLD_BUFFERS,
345 g_param_spec_uint ("min-threshold-buffers", "Min. threshold (buffers)",
346 "Min. number of buffers in the queue to allow reading (0=disable)",
347 0, G_MAXUINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
348 g_object_class_install_property (gobject_class, PROP_MIN_THRESHOLD_TIME,
349 g_param_spec_uint64 ("min-threshold-time", "Min. threshold (ns)",
350 "Min. amount of data in the queue to allow reading (in ns, 0=disable)",
351 0, G_MAXUINT64, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
353 g_object_class_install_property (gobject_class, PROP_LEAKY,
354 g_param_spec_enum ("leaky", "Leaky",
355 "Where the queue leaks, if at all",
356 GST_TYPE_QUEUE_LEAKY, GST_QUEUE_NO_LEAK,
357 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
362 * Don't emit queue signals. Makes queues more lightweight if no signals are
365 g_object_class_install_property (gobject_class, PROP_SILENT,
366 g_param_spec_boolean ("silent", "Silent",
367 "Don't emit queue signals", FALSE,
368 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
371 * GstQueue:flush-on-eos
373 * Discard all data in the queue when an EOS event is received, and pass
374 * on the EOS event as soon as possible (instead of waiting until all
375 * buffers in the queue have been processed, which is the default behaviour).
377 * Flushing the queue on EOS might be useful when capturing and encoding
378 * from a live source, to finish up the recording quickly in cases when
379 * the encoder is slow. Note that this might mean some data from the end of
380 * the recoding data might be lost though (never more than the configured
381 * max. sizes though).
385 g_object_class_install_property (gobject_class, PROP_FLUSH_ON_EOS,
386 g_param_spec_boolean ("flush-on-eos", "Flush on EOS",
387 "Discard all data in the queue when an EOS event is received", FALSE,
388 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
390 gobject_class->finalize = gst_queue_finalize;
392 gst_element_class_set_static_metadata (gstelement_class,
394 "Generic", "Simple data queue", "Erik Walthinsen <omega@cse.ogi.edu>");
395 gst_element_class_add_pad_template (gstelement_class,
396 gst_static_pad_template_get (&srctemplate));
397 gst_element_class_add_pad_template (gstelement_class,
398 gst_static_pad_template_get (&sinktemplate));
400 /* Registering debug symbols for function pointers */
401 GST_DEBUG_REGISTER_FUNCPTR (gst_queue_src_activate_mode);
402 GST_DEBUG_REGISTER_FUNCPTR (gst_queue_handle_sink_event);
403 GST_DEBUG_REGISTER_FUNCPTR (gst_queue_handle_sink_query);
404 GST_DEBUG_REGISTER_FUNCPTR (gst_queue_handle_src_event);
405 GST_DEBUG_REGISTER_FUNCPTR (gst_queue_handle_src_query);
406 GST_DEBUG_REGISTER_FUNCPTR (gst_queue_chain);
410 gst_queue_init (GstQueue * queue)
412 queue->sinkpad = gst_pad_new_from_static_template (&sinktemplate, "sink");
414 gst_pad_set_chain_function (queue->sinkpad, gst_queue_chain);
415 gst_pad_set_activatemode_function (queue->sinkpad,
416 gst_queue_sink_activate_mode);
417 gst_pad_set_event_function (queue->sinkpad, gst_queue_handle_sink_event);
418 gst_pad_set_query_function (queue->sinkpad, gst_queue_handle_sink_query);
419 GST_PAD_SET_PROXY_CAPS (queue->sinkpad);
420 gst_element_add_pad (GST_ELEMENT (queue), queue->sinkpad);
422 queue->srcpad = gst_pad_new_from_static_template (&srctemplate, "src");
424 gst_pad_set_activatemode_function (queue->srcpad,
425 gst_queue_src_activate_mode);
426 gst_pad_set_event_function (queue->srcpad, gst_queue_handle_src_event);
427 gst_pad_set_query_function (queue->srcpad, gst_queue_handle_src_query);
428 GST_PAD_SET_PROXY_CAPS (queue->srcpad);
429 gst_element_add_pad (GST_ELEMENT (queue), queue->srcpad);
431 GST_QUEUE_CLEAR_LEVEL (queue->cur_level);
432 queue->max_size.buffers = DEFAULT_MAX_SIZE_BUFFERS;
433 queue->max_size.bytes = DEFAULT_MAX_SIZE_BYTES;
434 queue->max_size.time = DEFAULT_MAX_SIZE_TIME;
435 GST_QUEUE_CLEAR_LEVEL (queue->min_threshold);
436 GST_QUEUE_CLEAR_LEVEL (queue->orig_min_threshold);
437 gst_segment_init (&queue->sink_segment, GST_FORMAT_TIME);
438 gst_segment_init (&queue->src_segment, GST_FORMAT_TIME);
439 queue->head_needs_discont = queue->tail_needs_discont = FALSE;
441 queue->leaky = GST_QUEUE_NO_LEAK;
442 queue->srcresult = GST_FLOW_FLUSHING;
444 g_mutex_init (&queue->qlock);
445 g_cond_init (&queue->item_add);
446 g_cond_init (&queue->item_del);
447 g_cond_init (&queue->query_handled);
449 queue->queue = gst_queue_array_new (DEFAULT_MAX_SIZE_BUFFERS * 3 / 2);
451 queue->sinktime = GST_CLOCK_TIME_NONE;
452 queue->srctime = GST_CLOCK_TIME_NONE;
454 queue->sink_tainted = TRUE;
455 queue->src_tainted = TRUE;
457 queue->newseg_applied_to_src = FALSE;
459 GST_DEBUG_OBJECT (queue,
460 "initialized queue's not_empty & not_full conditions");
463 /* called only once, as opposed to dispose */
465 gst_queue_finalize (GObject * object)
467 GstQueue *queue = GST_QUEUE (object);
469 GST_DEBUG_OBJECT (queue, "finalizing queue");
471 while (!gst_queue_array_is_empty (queue->queue)) {
472 GstQueueItem *qitem = gst_queue_array_pop_head (queue->queue);
473 /* FIXME: if it's a query, shouldn't we unref that too? */
474 if (!qitem->is_query)
475 gst_mini_object_unref (qitem->item);
476 g_slice_free (GstQueueItem, qitem);
478 gst_queue_array_free (queue->queue);
480 g_mutex_clear (&queue->qlock);
481 g_cond_clear (&queue->item_add);
482 g_cond_clear (&queue->item_del);
483 g_cond_clear (&queue->query_handled);
485 G_OBJECT_CLASS (parent_class)->finalize (object);
488 /* calculate the diff between running time on the sink and src of the queue.
489 * This is the total amount of time in the queue. */
491 update_time_level (GstQueue * queue)
493 gint64 sink_time, src_time;
495 if (queue->sink_tainted) {
496 GST_LOG_OBJECT (queue, "update sink time");
498 gst_segment_to_running_time (&queue->sink_segment, GST_FORMAT_TIME,
499 queue->sink_segment.position);
500 queue->sink_tainted = FALSE;
502 sink_time = queue->sinktime;
504 if (queue->src_tainted) {
505 GST_LOG_OBJECT (queue, "update src time");
507 gst_segment_to_running_time (&queue->src_segment, GST_FORMAT_TIME,
508 queue->src_segment.position);
509 queue->src_tainted = FALSE;
511 src_time = queue->srctime;
513 GST_LOG_OBJECT (queue, "sink %" GST_TIME_FORMAT ", src %" GST_TIME_FORMAT,
514 GST_TIME_ARGS (sink_time), GST_TIME_ARGS (src_time));
516 if (sink_time >= src_time)
517 queue->cur_level.time = sink_time - src_time;
519 queue->cur_level.time = 0;
522 /* take a SEGMENT event and apply the values to segment, updating the time
525 apply_segment (GstQueue * queue, GstEvent * event, GstSegment * segment,
528 gst_event_copy_segment (event, segment);
530 /* now configure the values, we use these to track timestamps on the
532 if (segment->format != GST_FORMAT_TIME) {
533 /* non-time format, pretent the current time segment is closed with a
534 * 0 start and unknown stop time. */
535 segment->format = GST_FORMAT_TIME;
541 queue->sink_tainted = TRUE;
543 queue->src_tainted = TRUE;
545 GST_DEBUG_OBJECT (queue, "configured SEGMENT %" GST_SEGMENT_FORMAT, segment);
547 /* segment can update the time level of the queue */
548 update_time_level (queue);
551 /* take a buffer and update segment, updating the time level of the queue. */
553 apply_buffer (GstQueue * queue, GstBuffer * buffer, GstSegment * segment,
554 gboolean with_duration, gboolean sink)
556 GstClockTime duration, timestamp;
558 timestamp = GST_BUFFER_TIMESTAMP (buffer);
559 duration = GST_BUFFER_DURATION (buffer);
561 /* if no timestamp is set, assume it's continuous with the previous
563 if (timestamp == GST_CLOCK_TIME_NONE)
564 timestamp = segment->position;
567 if (with_duration && duration != GST_CLOCK_TIME_NONE)
568 timestamp += duration;
570 GST_LOG_OBJECT (queue, "position updated to %" GST_TIME_FORMAT,
571 GST_TIME_ARGS (timestamp));
573 segment->position = timestamp;
575 queue->sink_tainted = TRUE;
577 queue->src_tainted = TRUE;
580 /* calc diff with other end */
581 update_time_level (queue);
585 gst_queue_locked_flush (GstQueue * queue, gboolean full)
587 while (!gst_queue_array_is_empty (queue->queue)) {
588 GstQueueItem *qitem = gst_queue_array_pop_head (queue->queue);
590 /* Then lose another reference because we are supposed to destroy that
591 data when flushing */
592 if (!full && GST_IS_EVENT (qitem->item) && GST_EVENT_IS_STICKY (qitem->item)
593 && GST_EVENT_TYPE (qitem->item) != GST_EVENT_SEGMENT
594 && GST_EVENT_TYPE (qitem->item) != GST_EVENT_EOS) {
595 gst_pad_store_sticky_event (queue->srcpad, GST_EVENT_CAST (qitem->item));
597 if (!qitem->is_query)
598 gst_mini_object_unref (qitem->item);
599 g_slice_free (GstQueueItem, qitem);
601 queue->last_query = FALSE;
602 g_cond_signal (&queue->query_handled);
603 GST_QUEUE_CLEAR_LEVEL (queue->cur_level);
604 queue->min_threshold.buffers = queue->orig_min_threshold.buffers;
605 queue->min_threshold.bytes = queue->orig_min_threshold.bytes;
606 queue->min_threshold.time = queue->orig_min_threshold.time;
607 gst_segment_init (&queue->sink_segment, GST_FORMAT_TIME);
608 gst_segment_init (&queue->src_segment, GST_FORMAT_TIME);
609 queue->head_needs_discont = queue->tail_needs_discont = FALSE;
611 queue->sinktime = queue->srctime = GST_CLOCK_TIME_NONE;
612 queue->sink_tainted = queue->src_tainted = TRUE;
614 /* we deleted a lot of something */
615 GST_QUEUE_SIGNAL_DEL (queue);
618 /* enqueue an item an update the level stats, with QUEUE_LOCK */
620 gst_queue_locked_enqueue_buffer (GstQueue * queue, gpointer item)
622 GstBuffer *buffer = GST_BUFFER_CAST (item);
624 /* add buffer to the statistics */
625 queue->cur_level.buffers++;
626 queue->cur_level.bytes += gst_buffer_get_size (buffer);
627 apply_buffer (queue, buffer, &queue->sink_segment, TRUE, TRUE);
630 GstQueueItem *qitem = g_slice_new (GstQueueItem);
632 qitem->is_query = FALSE;
633 gst_queue_array_push_tail (queue->queue, qitem);
635 GST_QUEUE_SIGNAL_ADD (queue);
639 gst_queue_locked_enqueue_event (GstQueue * queue, gpointer item)
641 GstEvent *event = GST_EVENT_CAST (item);
643 switch (GST_EVENT_TYPE (event)) {
645 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "got EOS from upstream");
646 /* Zero the thresholds, this makes sure the queue is completely
647 * filled and we can read all data from the queue. */
648 if (queue->flush_on_eos)
649 gst_queue_locked_flush (queue, FALSE);
651 GST_QUEUE_CLEAR_LEVEL (queue->min_threshold);
652 /* mark the queue as EOS. This prevents us from accepting more data. */
655 case GST_EVENT_SEGMENT:
656 apply_segment (queue, event, &queue->sink_segment, TRUE);
657 /* if the queue is empty, apply sink segment on the source */
658 if (gst_queue_array_is_empty (queue->queue)) {
659 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "Apply segment on srcpad");
660 apply_segment (queue, event, &queue->src_segment, FALSE);
661 queue->newseg_applied_to_src = TRUE;
663 /* a new segment allows us to accept more buffers if we got EOS
665 queue->unexpected = FALSE;
672 GstQueueItem *qitem = g_slice_new (GstQueueItem);
674 qitem->is_query = FALSE;
675 gst_queue_array_push_tail (queue->queue, qitem);
677 GST_QUEUE_SIGNAL_ADD (queue);
680 /* dequeue an item from the queue and update level stats, with QUEUE_LOCK */
681 static GstMiniObject *
682 gst_queue_locked_dequeue (GstQueue * queue)
687 qitem = gst_queue_array_pop_head (queue->queue);
692 g_slice_free (GstQueueItem, qitem);
694 if (GST_IS_BUFFER (item)) {
695 GstBuffer *buffer = GST_BUFFER_CAST (item);
697 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
698 "retrieved buffer %p from queue", buffer);
700 queue->cur_level.buffers--;
701 queue->cur_level.bytes -= gst_buffer_get_size (buffer);
702 apply_buffer (queue, buffer, &queue->src_segment, TRUE, FALSE);
704 /* if the queue is empty now, update the other side */
705 if (queue->cur_level.buffers == 0)
706 queue->cur_level.time = 0;
708 } else if (GST_IS_EVENT (item)) {
709 GstEvent *event = GST_EVENT_CAST (item);
711 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
712 "retrieved event %p from queue", event);
714 switch (GST_EVENT_TYPE (event)) {
716 /* queue is empty now that we dequeued the EOS */
717 GST_QUEUE_CLEAR_LEVEL (queue->cur_level);
719 case GST_EVENT_SEGMENT:
720 /* apply newsegment if it has not already been applied */
721 if (G_LIKELY (!queue->newseg_applied_to_src)) {
722 apply_segment (queue, event, &queue->src_segment, FALSE);
724 queue->newseg_applied_to_src = FALSE;
730 } else if (GST_IS_QUERY (item)) {
731 GstQuery *query = GST_QUERY_CAST (item);
733 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
734 "retrieved query %p from queue", query);
737 ("Unexpected item %p dequeued from queue %s (refcounting problem?)",
738 item, GST_OBJECT_NAME (queue));
741 GST_QUEUE_SIGNAL_DEL (queue);
748 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "the queue is empty");
754 gst_queue_handle_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
758 queue = GST_QUEUE (parent);
760 switch (GST_EVENT_TYPE (event)) {
761 case GST_EVENT_FLUSH_START:
763 STATUS (queue, pad, "received flush start event");
765 gst_pad_push_event (queue->srcpad, event);
767 /* now unblock the chain function */
768 GST_QUEUE_MUTEX_LOCK (queue);
769 queue->srcresult = GST_FLOW_FLUSHING;
770 /* unblock the loop and chain functions */
771 GST_QUEUE_SIGNAL_ADD (queue);
772 GST_QUEUE_SIGNAL_DEL (queue);
773 queue->last_query = FALSE;
774 g_cond_signal (&queue->query_handled);
775 GST_QUEUE_MUTEX_UNLOCK (queue);
777 /* make sure it pauses, this should happen since we sent
778 * flush_start downstream. */
779 gst_pad_pause_task (queue->srcpad);
780 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "loop stopped");
783 case GST_EVENT_FLUSH_STOP:
785 STATUS (queue, pad, "received flush stop event");
787 gst_pad_push_event (queue->srcpad, event);
789 GST_QUEUE_MUTEX_LOCK (queue);
790 gst_queue_locked_flush (queue, FALSE);
791 queue->srcresult = GST_FLOW_OK;
793 queue->unexpected = FALSE;
794 gst_pad_start_task (queue->srcpad, (GstTaskFunction) gst_queue_loop,
795 queue->srcpad, NULL);
796 GST_QUEUE_MUTEX_UNLOCK (queue);
798 STATUS (queue, pad, "after flush");
802 if (GST_EVENT_IS_SERIALIZED (event)) {
803 /* serialized events go in the queue */
804 GST_QUEUE_MUTEX_LOCK (queue);
805 if (queue->srcresult != GST_FLOW_OK) {
806 /* Errors in sticky event pushing are no problem and ignored here
807 * as they will cause more meaningful errors during data flow.
808 * For EOS events, that are not followed by data flow, we still
809 * return FALSE here though.
811 if (!GST_EVENT_IS_STICKY (event) ||
812 GST_EVENT_TYPE (event) == GST_EVENT_EOS)
815 /* refuse more events on EOS */
818 gst_queue_locked_enqueue_event (queue, event);
819 GST_QUEUE_MUTEX_UNLOCK (queue);
821 /* non-serialized events are forwarded downstream immediately */
822 gst_pad_push_event (queue->srcpad, event);
832 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "refusing event, we are EOS");
833 GST_QUEUE_MUTEX_UNLOCK (queue);
834 gst_event_unref (event);
839 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
840 "refusing event, we have a downstream flow error: %s",
841 gst_flow_get_name (queue->srcresult));
842 GST_QUEUE_MUTEX_UNLOCK (queue);
843 gst_event_unref (event);
849 gst_queue_handle_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
851 GstQueue *queue = GST_QUEUE_CAST (parent);
854 switch (GST_QUERY_TYPE (query)) {
856 if (G_UNLIKELY (GST_QUERY_IS_SERIALIZED (query))) {
859 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
860 GST_LOG_OBJECT (queue, "queuing query %p (%s)", query,
861 GST_QUERY_TYPE_NAME (query));
862 qitem = g_slice_new (GstQueueItem);
863 qitem->item = GST_MINI_OBJECT_CAST (query);
864 qitem->is_query = TRUE;
865 gst_queue_array_push_tail (queue->queue, qitem);
866 GST_QUEUE_SIGNAL_ADD (queue);
867 g_cond_wait (&queue->query_handled, &queue->qlock);
868 if (queue->srcresult != GST_FLOW_OK)
870 res = queue->last_query;
871 GST_QUEUE_MUTEX_UNLOCK (queue);
873 res = gst_pad_query_default (pad, parent, query);
882 GST_DEBUG_OBJECT (queue, "we are flushing");
883 GST_QUEUE_MUTEX_UNLOCK (queue);
889 gst_queue_is_empty (GstQueue * queue)
893 if (gst_queue_array_is_empty (queue->queue))
896 /* Only consider the queue empty if the minimum thresholds
897 * are not reached and data is at the queue head. Otherwise
898 * we would block forever on serialized queries.
900 head = gst_queue_array_peek_head (queue->queue);
901 if (!GST_IS_BUFFER (head->item) && !GST_IS_BUFFER_LIST (head->item))
904 /* It is possible that a max size is reached before all min thresholds are.
905 * Therefore, only consider it empty if it is not filled. */
906 return ((queue->min_threshold.buffers > 0 &&
907 queue->cur_level.buffers < queue->min_threshold.buffers) ||
908 (queue->min_threshold.bytes > 0 &&
909 queue->cur_level.bytes < queue->min_threshold.bytes) ||
910 (queue->min_threshold.time > 0 &&
911 queue->cur_level.time < queue->min_threshold.time)) &&
912 !gst_queue_is_filled (queue);
916 gst_queue_is_filled (GstQueue * queue)
918 return (((queue->max_size.buffers > 0 &&
919 queue->cur_level.buffers >= queue->max_size.buffers) ||
920 (queue->max_size.bytes > 0 &&
921 queue->cur_level.bytes >= queue->max_size.bytes) ||
922 (queue->max_size.time > 0 &&
923 queue->cur_level.time >= queue->max_size.time)));
927 gst_queue_leak_downstream (GstQueue * queue)
929 /* for as long as the queue is filled, dequeue an item and discard it */
930 while (gst_queue_is_filled (queue)) {
933 leak = gst_queue_locked_dequeue (queue);
934 /* there is nothing to dequeue and the queue is still filled.. This should
936 g_assert (leak != NULL);
938 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
939 "queue is full, leaking item %p on downstream end", leak);
940 if (GST_IS_EVENT (leak) && GST_EVENT_IS_STICKY (leak)) {
941 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
942 "Storing sticky event %s on srcpad", GST_EVENT_TYPE_NAME (leak));
943 gst_pad_store_sticky_event (queue->srcpad, GST_EVENT_CAST (leak));
946 if (!GST_IS_QUERY (leak))
947 gst_mini_object_unref (leak);
949 /* last buffer needs to get a DISCONT flag */
950 queue->head_needs_discont = TRUE;
955 gst_queue_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
958 GstClockTime duration, timestamp;
960 queue = GST_QUEUE_CAST (parent);
962 /* we have to lock the queue since we span threads */
963 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
964 /* when we received EOS, we refuse any more data */
967 if (queue->unexpected)
970 timestamp = GST_BUFFER_TIMESTAMP (buffer);
971 duration = GST_BUFFER_DURATION (buffer);
973 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "received buffer %p of size %"
974 G_GSIZE_FORMAT ", time %" GST_TIME_FORMAT ", duration %"
975 GST_TIME_FORMAT, buffer, gst_buffer_get_size (buffer),
976 GST_TIME_ARGS (timestamp), GST_TIME_ARGS (duration));
978 /* We make space available if we're "full" according to whatever
979 * the user defined as "full". Note that this only applies to buffers.
980 * We always handle events and they don't count in our statistics. */
981 while (gst_queue_is_filled (queue)) {
982 if (!queue->silent) {
983 GST_QUEUE_MUTEX_UNLOCK (queue);
984 g_signal_emit (queue, gst_queue_signals[SIGNAL_OVERRUN], 0);
985 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
986 /* we recheck, the signal could have changed the thresholds */
987 if (!gst_queue_is_filled (queue))
991 /* how are we going to make space for this buffer? */
992 switch (queue->leaky) {
993 case GST_QUEUE_LEAK_UPSTREAM:
994 /* next buffer needs to get a DISCONT flag */
995 queue->tail_needs_discont = TRUE;
996 /* leak current buffer */
997 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
998 "queue is full, leaking buffer on upstream end");
999 /* now we can clean up and exit right away */
1001 case GST_QUEUE_LEAK_DOWNSTREAM:
1002 gst_queue_leak_downstream (queue);
1005 g_warning ("Unknown leaky type, using default");
1007 case GST_QUEUE_NO_LEAK:
1009 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue,
1010 "queue is full, waiting for free space");
1012 /* don't leak. Instead, wait for space to be available */
1014 /* for as long as the queue is filled, wait till an item was deleted. */
1015 GST_QUEUE_WAIT_DEL_CHECK (queue, out_flushing);
1016 } while (gst_queue_is_filled (queue));
1018 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "queue is not full");
1020 if (!queue->silent) {
1021 GST_QUEUE_MUTEX_UNLOCK (queue);
1022 g_signal_emit (queue, gst_queue_signals[SIGNAL_RUNNING], 0);
1023 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
1030 if (queue->tail_needs_discont) {
1031 GstBuffer *subbuffer = gst_buffer_make_writable (buffer);
1035 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1037 GST_DEBUG_OBJECT (queue, "Could not mark buffer as DISCONT");
1039 queue->tail_needs_discont = FALSE;
1042 /* put buffer in queue now */
1043 gst_queue_locked_enqueue_buffer (queue, buffer);
1044 GST_QUEUE_MUTEX_UNLOCK (queue);
1048 /* special conditions */
1051 GST_QUEUE_MUTEX_UNLOCK (queue);
1053 gst_buffer_unref (buffer);
1059 GstFlowReturn ret = queue->srcresult;
1061 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1062 "exit because task paused, reason: %s", gst_flow_get_name (ret));
1063 GST_QUEUE_MUTEX_UNLOCK (queue);
1064 gst_buffer_unref (buffer);
1070 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "exit because we received EOS");
1071 GST_QUEUE_MUTEX_UNLOCK (queue);
1073 gst_buffer_unref (buffer);
1075 return GST_FLOW_EOS;
1079 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "exit because we received EOS");
1080 GST_QUEUE_MUTEX_UNLOCK (queue);
1082 gst_buffer_unref (buffer);
1084 return GST_FLOW_EOS;
1088 /* dequeue an item from the queue an push it downstream. This functions returns
1089 * the result of the push. */
1090 static GstFlowReturn
1091 gst_queue_push_one (GstQueue * queue)
1093 GstFlowReturn result = GST_FLOW_OK;
1094 GstMiniObject *data;
1096 data = gst_queue_locked_dequeue (queue);
1101 if (GST_IS_BUFFER (data)) {
1104 buffer = GST_BUFFER_CAST (data);
1106 if (queue->head_needs_discont) {
1107 GstBuffer *subbuffer = gst_buffer_make_writable (buffer);
1111 GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
1113 GST_DEBUG_OBJECT (queue, "Could not mark buffer as DISCONT");
1115 queue->head_needs_discont = FALSE;
1118 GST_QUEUE_MUTEX_UNLOCK (queue);
1119 result = gst_pad_push (queue->srcpad, buffer);
1121 /* need to check for srcresult here as well */
1122 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
1124 if (result == GST_FLOW_EOS) {
1125 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "got EOS from downstream");
1126 /* stop pushing buffers, we dequeue all items until we see an item that we
1127 * can push again, which is EOS or SEGMENT. If there is nothing in the
1128 * queue we can push, we set a flag to make the sinkpad refuse more
1129 * buffers with an EOS return value. */
1130 while ((data = gst_queue_locked_dequeue (queue))) {
1131 if (GST_IS_BUFFER (data)) {
1132 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1133 "dropping EOS buffer %p", data);
1134 gst_buffer_unref (GST_BUFFER_CAST (data));
1135 } else if (GST_IS_EVENT (data)) {
1136 GstEvent *event = GST_EVENT_CAST (data);
1137 GstEventType type = GST_EVENT_TYPE (event);
1139 if (type == GST_EVENT_EOS || type == GST_EVENT_SEGMENT) {
1140 /* we found a pushable item in the queue, push it out */
1141 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1142 "pushing pushable event %s after EOS",
1143 GST_EVENT_TYPE_NAME (event));
1146 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1147 "dropping EOS event %p", event);
1148 gst_event_unref (event);
1149 } else if (GST_IS_QUERY (data)) {
1150 GstQuery *query = GST_QUERY_CAST (data);
1152 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1153 "dropping query %p because of EOS", query);
1154 queue->last_query = FALSE;
1155 g_cond_signal (&queue->query_handled);
1158 /* no more items in the queue. Set the unexpected flag so that upstream
1159 * make us refuse any more buffers on the sinkpad. Since we will still
1160 * accept EOS and SEGMENT we return _FLOW_OK to the caller so that the
1161 * task function does not shut down. */
1162 queue->unexpected = TRUE;
1163 result = GST_FLOW_OK;
1165 } else if (GST_IS_EVENT (data)) {
1166 GstEvent *event = GST_EVENT_CAST (data);
1167 GstEventType type = GST_EVENT_TYPE (event);
1169 GST_QUEUE_MUTEX_UNLOCK (queue);
1171 gst_pad_push_event (queue->srcpad, event);
1173 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
1174 /* if we're EOS, return EOS so that the task pauses. */
1175 if (type == GST_EVENT_EOS) {
1176 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1177 "pushed EOS event %p, return EOS", event);
1178 result = GST_FLOW_EOS;
1180 } else if (GST_IS_QUERY (data)) {
1181 GstQuery *query = GST_QUERY_CAST (data);
1183 queue->last_query = gst_pad_peer_query (queue->srcpad, query);
1184 g_cond_signal (&queue->query_handled);
1185 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1186 "did query %p, return %d", query, queue->last_query);
1193 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1194 "exit because we have no item in the queue");
1195 return GST_FLOW_ERROR;
1199 GST_CAT_LOG_OBJECT (queue_dataflow, queue, "exit because we are flushing");
1200 return GST_FLOW_FLUSHING;
1205 gst_queue_loop (GstPad * pad)
1210 queue = (GstQueue *) GST_PAD_PARENT (pad);
1212 /* have to lock for thread-safety */
1213 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
1215 while (gst_queue_is_empty (queue)) {
1216 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "queue is empty");
1217 if (!queue->silent) {
1218 GST_QUEUE_MUTEX_UNLOCK (queue);
1219 g_signal_emit (queue, gst_queue_signals[SIGNAL_UNDERRUN], 0);
1220 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
1223 /* we recheck, the signal could have changed the thresholds */
1224 while (gst_queue_is_empty (queue)) {
1225 GST_QUEUE_WAIT_ADD_CHECK (queue, out_flushing);
1228 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "queue is not empty");
1229 if (!queue->silent) {
1230 GST_QUEUE_MUTEX_UNLOCK (queue);
1231 g_signal_emit (queue, gst_queue_signals[SIGNAL_RUNNING], 0);
1232 g_signal_emit (queue, gst_queue_signals[SIGNAL_PUSHING], 0);
1233 GST_QUEUE_MUTEX_LOCK_CHECK (queue, out_flushing);
1237 ret = gst_queue_push_one (queue);
1238 queue->srcresult = ret;
1239 if (ret != GST_FLOW_OK)
1242 GST_QUEUE_MUTEX_UNLOCK (queue);
1249 gboolean eos = queue->eos;
1250 GstFlowReturn ret = queue->srcresult;
1252 gst_pad_pause_task (queue->srcpad);
1253 GST_CAT_LOG_OBJECT (queue_dataflow, queue,
1254 "pause task, reason: %s", gst_flow_get_name (ret));
1255 if (ret == GST_FLOW_FLUSHING)
1256 gst_queue_locked_flush (queue, FALSE);
1258 GST_QUEUE_SIGNAL_DEL (queue);
1259 GST_QUEUE_MUTEX_UNLOCK (queue);
1260 /* let app know about us giving up if upstream is not expected to do so */
1261 /* EOS is already taken care of elsewhere */
1262 if (eos && (ret == GST_FLOW_NOT_LINKED || ret < GST_FLOW_EOS)) {
1263 GST_ELEMENT_ERROR (queue, STREAM, FAILED,
1264 (_("Internal data flow error.")),
1265 ("streaming task paused, reason %s (%d)",
1266 gst_flow_get_name (ret), ret));
1267 gst_pad_push_event (queue->srcpad, gst_event_new_eos ());
1274 gst_queue_handle_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
1276 gboolean res = TRUE;
1277 GstQueue *queue = GST_QUEUE (parent);
1279 #ifndef GST_DISABLE_GST_DEBUG
1280 GST_CAT_DEBUG_OBJECT (queue_dataflow, queue, "got event %p (%d)",
1281 event, GST_EVENT_TYPE (event));
1284 switch (GST_EVENT_TYPE (event)) {
1285 case GST_EVENT_RECONFIGURE:
1286 GST_QUEUE_MUTEX_LOCK (queue);
1287 if (queue->srcresult == GST_FLOW_NOT_LINKED) {
1288 /* when we got not linked, assume downstream is linked again now and we
1289 * can try to start pushing again */
1290 queue->srcresult = GST_FLOW_OK;
1291 gst_pad_start_task (pad, (GstTaskFunction) gst_queue_loop, pad, NULL);
1293 GST_QUEUE_MUTEX_UNLOCK (queue);
1295 res = gst_pad_push_event (queue->sinkpad, event);
1298 res = gst_pad_event_default (pad, parent, event);
1307 gst_queue_handle_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
1309 GstQueue *queue = GST_QUEUE (parent);
1312 switch (GST_QUERY_TYPE (query)) {
1313 case GST_QUERY_SCHEDULING:{
1314 gst_query_add_scheduling_mode (query, GST_PAD_MODE_PUSH);
1319 res = gst_pad_query_default (pad, parent, query);
1326 /* Adjust peer response for data contained in queue */
1327 switch (GST_QUERY_TYPE (query)) {
1328 case GST_QUERY_POSITION:
1333 /* get peer position */
1334 gst_query_parse_position (query, &format, &peer_pos);
1336 /* FIXME: this code assumes that there's no discont in the queue */
1338 case GST_FORMAT_BYTES:
1339 peer_pos -= queue->cur_level.bytes;
1341 case GST_FORMAT_TIME:
1342 peer_pos -= queue->cur_level.time;
1345 GST_DEBUG_OBJECT (queue, "Can't adjust query in %s format, don't "
1346 "know how to adjust value", gst_format_get_name (format));
1349 /* set updated position */
1350 gst_query_set_position (query, format, peer_pos);
1353 case GST_QUERY_LATENCY:
1356 GstClockTime min, max;
1358 gst_query_parse_latency (query, &live, &min, &max);
1360 /* we can delay up to the limit of the queue in time. If we have no time
1361 * limit, the best thing we can do is to return an infinite delay. In
1362 * reality a better estimate would be the byte/buffer rate but that is not
1363 * possible right now. */
1364 if (queue->max_size.time > 0 && max != -1)
1365 max += queue->max_size.time;
1369 /* adjust for min-threshold */
1370 if (queue->min_threshold.time > 0 && min != -1)
1371 min += queue->min_threshold.time;
1373 gst_query_set_latency (query, live, min, max);
1377 /* peer handled other queries */
1385 gst_queue_sink_activate_mode (GstPad * pad, GstObject * parent, GstPadMode mode,
1391 queue = GST_QUEUE (parent);
1394 case GST_PAD_MODE_PUSH:
1396 GST_QUEUE_MUTEX_LOCK (queue);
1397 queue->srcresult = GST_FLOW_OK;
1399 queue->unexpected = FALSE;
1400 GST_QUEUE_MUTEX_UNLOCK (queue);
1402 /* step 1, unblock chain function */
1403 GST_QUEUE_MUTEX_LOCK (queue);
1404 queue->srcresult = GST_FLOW_FLUSHING;
1405 gst_queue_locked_flush (queue, TRUE);
1406 GST_QUEUE_MUTEX_UNLOCK (queue);
1418 gst_queue_src_activate_mode (GstPad * pad, GstObject * parent, GstPadMode mode,
1424 queue = GST_QUEUE (parent);
1427 case GST_PAD_MODE_PUSH:
1429 GST_QUEUE_MUTEX_LOCK (queue);
1430 queue->srcresult = GST_FLOW_OK;
1432 queue->unexpected = FALSE;
1434 gst_pad_start_task (pad, (GstTaskFunction) gst_queue_loop, pad,
1436 GST_QUEUE_MUTEX_UNLOCK (queue);
1438 /* step 1, unblock loop function */
1439 GST_QUEUE_MUTEX_LOCK (queue);
1440 queue->srcresult = GST_FLOW_FLUSHING;
1441 /* the item add signal will unblock */
1442 g_cond_signal (&queue->item_add);
1443 GST_QUEUE_MUTEX_UNLOCK (queue);
1445 /* step 2, make sure streaming finishes */
1446 result = gst_pad_stop_task (pad);
1457 queue_capacity_change (GstQueue * queue)
1459 if (queue->leaky == GST_QUEUE_LEAK_DOWNSTREAM) {
1460 gst_queue_leak_downstream (queue);
1463 /* changing the capacity of the queue must wake up
1464 * the _chain function, it might have more room now
1465 * to store the buffer/event in the queue */
1466 GST_QUEUE_SIGNAL_DEL (queue);
1469 /* Changing the minimum required fill level must
1470 * wake up the _loop function as it might now
1471 * be able to preceed.
1473 #define QUEUE_THRESHOLD_CHANGE(q)\
1474 GST_QUEUE_SIGNAL_ADD (q);
1477 gst_queue_set_property (GObject * object,
1478 guint prop_id, const GValue * value, GParamSpec * pspec)
1480 GstQueue *queue = GST_QUEUE (object);
1482 /* someone could change levels here, and since this
1483 * affects the get/put funcs, we need to lock for safety. */
1484 GST_QUEUE_MUTEX_LOCK (queue);
1487 case PROP_MAX_SIZE_BYTES:
1488 queue->max_size.bytes = g_value_get_uint (value);
1489 queue_capacity_change (queue);
1491 case PROP_MAX_SIZE_BUFFERS:
1492 queue->max_size.buffers = g_value_get_uint (value);
1493 queue_capacity_change (queue);
1495 case PROP_MAX_SIZE_TIME:
1496 queue->max_size.time = g_value_get_uint64 (value);
1497 queue_capacity_change (queue);
1499 case PROP_MIN_THRESHOLD_BYTES:
1500 queue->min_threshold.bytes = g_value_get_uint (value);
1501 queue->orig_min_threshold.bytes = queue->min_threshold.bytes;
1502 QUEUE_THRESHOLD_CHANGE (queue);
1504 case PROP_MIN_THRESHOLD_BUFFERS:
1505 queue->min_threshold.buffers = g_value_get_uint (value);
1506 queue->orig_min_threshold.buffers = queue->min_threshold.buffers;
1507 QUEUE_THRESHOLD_CHANGE (queue);
1509 case PROP_MIN_THRESHOLD_TIME:
1510 queue->min_threshold.time = g_value_get_uint64 (value);
1511 queue->orig_min_threshold.time = queue->min_threshold.time;
1512 QUEUE_THRESHOLD_CHANGE (queue);
1515 queue->leaky = g_value_get_enum (value);
1518 queue->silent = g_value_get_boolean (value);
1520 case PROP_FLUSH_ON_EOS:
1521 queue->flush_on_eos = g_value_get_boolean (value);
1524 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1528 GST_QUEUE_MUTEX_UNLOCK (queue);
1532 gst_queue_get_property (GObject * object,
1533 guint prop_id, GValue * value, GParamSpec * pspec)
1535 GstQueue *queue = GST_QUEUE (object);
1537 GST_QUEUE_MUTEX_LOCK (queue);
1540 case PROP_CUR_LEVEL_BYTES:
1541 g_value_set_uint (value, queue->cur_level.bytes);
1543 case PROP_CUR_LEVEL_BUFFERS:
1544 g_value_set_uint (value, queue->cur_level.buffers);
1546 case PROP_CUR_LEVEL_TIME:
1547 g_value_set_uint64 (value, queue->cur_level.time);
1549 case PROP_MAX_SIZE_BYTES:
1550 g_value_set_uint (value, queue->max_size.bytes);
1552 case PROP_MAX_SIZE_BUFFERS:
1553 g_value_set_uint (value, queue->max_size.buffers);
1555 case PROP_MAX_SIZE_TIME:
1556 g_value_set_uint64 (value, queue->max_size.time);
1558 case PROP_MIN_THRESHOLD_BYTES:
1559 g_value_set_uint (value, queue->min_threshold.bytes);
1561 case PROP_MIN_THRESHOLD_BUFFERS:
1562 g_value_set_uint (value, queue->min_threshold.buffers);
1564 case PROP_MIN_THRESHOLD_TIME:
1565 g_value_set_uint64 (value, queue->min_threshold.time);
1568 g_value_set_enum (value, queue->leaky);
1571 g_value_set_boolean (value, queue->silent);
1573 case PROP_FLUSH_ON_EOS:
1574 g_value_set_boolean (value, queue->flush_on_eos);
1577 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
1581 GST_QUEUE_MUTEX_UNLOCK (queue);