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>
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the
20 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 * Boston, MA 02111-1307, USA.
25 #include "gst_private.h"
28 #include "gstscheduler.h"
33 static GstElementDetails gst_queue_details = GST_ELEMENT_DETAILS (
37 "Erik Walthinsen <omega@cse.ogi.edu>"
41 /* Queue signals and args */
51 /* FIXME: don't we have another way of doing this
52 * "Gstreamer format" (frame/byte/time) queries? */
53 ARG_CUR_LEVEL_BUFFERS,
59 ARG_MIN_THRESHOLD_BUFFERS,
60 ARG_MIN_THRESHOLD_BYTES,
61 ARG_MIN_THRESHOLD_TIME,
68 typedef struct _GstQueueEventResponse {
70 gboolean ret, handled;
71 } GstQueueEventResponse;
73 static void gst_queue_base_init (GstQueueClass *klass);
74 static void gst_queue_class_init (GstQueueClass *klass);
75 static void gst_queue_init (GstQueue *queue);
76 static void gst_queue_dispose (GObject *object);
78 static void gst_queue_set_property (GObject *object,
82 static void gst_queue_get_property (GObject *object,
87 static void gst_queue_chain (GstPad *pad,
89 static GstData *gst_queue_get (GstPad *pad);
91 static gboolean gst_queue_handle_src_event (GstPad *pad,
94 static GstCaps *gst_queue_getcaps (GstPad *pad);
95 static GstPadLinkReturn
96 gst_queue_link (GstPad *pad,
98 static void gst_queue_locked_flush (GstQueue *queue);
100 static GstElementStateReturn
101 gst_queue_change_state (GstElement *element);
102 static gboolean gst_queue_release_locks (GstElement *element);
105 #define GST_TYPE_QUEUE_LEAKY (queue_leaky_get_type ())
108 queue_leaky_get_type (void)
110 static GType queue_leaky_type = 0;
111 static GEnumValue queue_leaky[] = {
112 { GST_QUEUE_NO_LEAK, "0", "Not Leaky" },
113 { GST_QUEUE_LEAK_UPSTREAM, "1", "Leaky on Upstream" },
114 { GST_QUEUE_LEAK_DOWNSTREAM, "2", "Leaky on Downstream" },
117 if (!queue_leaky_type) {
118 queue_leaky_type = g_enum_register_static("GstQueueLeaky", queue_leaky);
120 return queue_leaky_type;
123 static GstElementClass *parent_class = NULL;
124 static guint gst_queue_signals[LAST_SIGNAL] = { 0 };
127 gst_queue_get_type (void)
129 static GType queue_type = 0;
132 static const GTypeInfo queue_info = {
133 sizeof (GstQueueClass),
134 (GBaseInitFunc) gst_queue_base_init,
136 (GClassInitFunc) gst_queue_class_init,
141 (GInstanceInitFunc) gst_queue_init,
145 queue_type = g_type_register_static (GST_TYPE_ELEMENT,
146 "GstQueue", &queue_info, 0);
153 gst_queue_base_init (GstQueueClass *klass)
155 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
157 gst_element_class_set_details (gstelement_class, &gst_queue_details);
161 gst_queue_class_init (GstQueueClass *klass)
163 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
164 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
166 parent_class = g_type_class_peek_parent (klass);
169 gst_queue_signals[SIGNAL_UNDERRUN] =
170 g_signal_new ("underrun", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
171 G_STRUCT_OFFSET (GstQueueClass, underrun), NULL, NULL,
172 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
173 gst_queue_signals[SIGNAL_RUNNING] =
174 g_signal_new ("running", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
175 G_STRUCT_OFFSET (GstQueueClass, running), NULL, NULL,
176 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
177 gst_queue_signals[SIGNAL_OVERRUN] =
178 g_signal_new ("overrun", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
179 G_STRUCT_OFFSET (GstQueueClass, overrun), NULL, NULL,
180 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
183 g_object_class_install_property (gobject_class, ARG_CUR_LEVEL_BYTES,
184 g_param_spec_uint ("current-level-bytes", "Current level (kB)",
185 "Current amount of data in the queue (bytes)",
186 0, G_MAXUINT, 0, G_PARAM_READABLE));
187 g_object_class_install_property (gobject_class, ARG_CUR_LEVEL_BUFFERS,
188 g_param_spec_uint ("current-level-buffers", "Current level (buffers)",
189 "Current number of buffers in the queue",
190 0, G_MAXUINT, 0, G_PARAM_READABLE));
191 g_object_class_install_property (gobject_class, ARG_CUR_LEVEL_TIME,
192 g_param_spec_uint64 ("current-level-time", "Current level (ns)",
193 "Current amount of data in the queue (in ns)",
194 0, G_MAXUINT64, 0, G_PARAM_READABLE));
196 g_object_class_install_property (gobject_class, ARG_MAX_SIZE_BYTES,
197 g_param_spec_uint ("max-size-bytes", "Max. size (kB)",
198 "Max. amount of data in the queue (bytes, 0=disable)",
199 0, G_MAXUINT, 0, G_PARAM_READWRITE));
200 g_object_class_install_property (gobject_class, ARG_MAX_SIZE_BUFFERS,
201 g_param_spec_uint ("max-size-buffers", "Max. size (buffers)",
202 "Max. number of buffers in the queue (0=disable)",
203 0, G_MAXUINT, 0, G_PARAM_READWRITE));
204 g_object_class_install_property (gobject_class, ARG_MAX_SIZE_TIME,
205 g_param_spec_uint64 ("max-size-time", "Max. size (ns)",
206 "Max. amount of data in the queue (in ns, 0=disable)",
207 0, G_MAXUINT64, 0, G_PARAM_READWRITE));
209 g_object_class_install_property (gobject_class, ARG_MIN_THRESHOLD_BYTES,
210 g_param_spec_uint ("min-threshold-bytes", "Min. threshold (kB)",
211 "Min. amount of data in the queue to allow reading (bytes, 0=disable)",
212 0, G_MAXUINT, 0, G_PARAM_READWRITE));
213 g_object_class_install_property (gobject_class, ARG_MIN_THRESHOLD_BUFFERS,
214 g_param_spec_uint ("min-threshold-buffers", "Min. threshold (buffers)",
215 "Min. number of buffers in the queue to allow reading (0=disable)",
216 0, G_MAXUINT, 0, G_PARAM_READWRITE));
217 g_object_class_install_property (gobject_class, ARG_MIN_THRESHOLD_TIME,
218 g_param_spec_uint64 ("min-threshold-time", "Min. threshold (ns)",
219 "Min. amount of data in the queue to allow reading (in ns, 0=disable)",
220 0, G_MAXUINT64, 0, G_PARAM_READWRITE));
222 g_object_class_install_property (gobject_class, ARG_LEAKY,
223 g_param_spec_enum ("leaky", "Leaky",
224 "Where the queue leaks, if at all",
225 GST_TYPE_QUEUE_LEAKY, GST_QUEUE_NO_LEAK, G_PARAM_READWRITE));
226 g_object_class_install_property (gobject_class, ARG_MAY_DEADLOCK,
227 g_param_spec_boolean ("may_deadlock", "May Deadlock",
228 "The queue may deadlock if it's full and not PLAYING",
229 TRUE, G_PARAM_READWRITE));
230 g_object_class_install_property (gobject_class, ARG_BLOCK_TIMEOUT,
231 g_param_spec_uint64 ("block_timeout", "Timeout for Block",
232 "Nanoseconds until blocked queue times out and returns filler event. "
233 "Value of -1 disables timeout",
234 0, G_MAXUINT64, -1, G_PARAM_READWRITE));
236 /* set several parent class virtual functions */
237 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_queue_dispose);
238 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_queue_set_property);
239 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_queue_get_property);
241 gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_queue_change_state);
242 gstelement_class->release_locks = GST_DEBUG_FUNCPTR (gst_queue_release_locks);
246 gst_queue_init (GstQueue *queue)
248 /* scheduling on this kind of element is, well, interesting */
249 GST_FLAG_SET (queue, GST_ELEMENT_DECOUPLED);
250 GST_FLAG_SET (queue, GST_ELEMENT_EVENT_AWARE);
252 queue->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
253 gst_pad_set_chain_function (queue->sinkpad, GST_DEBUG_FUNCPTR (gst_queue_chain));
254 gst_element_add_pad (GST_ELEMENT (queue), queue->sinkpad);
255 gst_pad_set_link_function (queue->sinkpad, GST_DEBUG_FUNCPTR (gst_queue_link));
256 gst_pad_set_getcaps_function (queue->sinkpad, GST_DEBUG_FUNCPTR (gst_queue_getcaps));
257 gst_pad_set_active (queue->sinkpad, TRUE);
259 queue->srcpad = gst_pad_new ("src", GST_PAD_SRC);
260 gst_pad_set_get_function (queue->srcpad, GST_DEBUG_FUNCPTR (gst_queue_get));
261 gst_element_add_pad (GST_ELEMENT (queue), queue->srcpad);
262 gst_pad_set_link_function (queue->srcpad, GST_DEBUG_FUNCPTR (gst_queue_link));
263 gst_pad_set_getcaps_function (queue->srcpad, GST_DEBUG_FUNCPTR (gst_queue_getcaps));
264 gst_pad_set_event_function (queue->srcpad, GST_DEBUG_FUNCPTR (gst_queue_handle_src_event));
265 gst_pad_set_active (queue->srcpad, TRUE);
267 queue->cur_level.buffers = 0; /* no content */
268 queue->cur_level.bytes = 0; /* no content */
269 queue->cur_level.time = 0; /* no content */
270 queue->max_size.buffers = 250; /* high limit */
271 queue->max_size.bytes = 0; /* unlimited */
272 queue->max_size.time = 0; /* unlimited */
273 queue->min_threshold.buffers = 0; /* no threshold */
274 queue->min_threshold.bytes = 0; /* no threshold */
275 queue->min_threshold.time = 0; /* no threshold */
277 queue->leaky = GST_QUEUE_NO_LEAK;
278 queue->may_deadlock = TRUE;
279 queue->block_timeout = GST_CLOCK_TIME_NONE;
280 queue->interrupt = FALSE;
281 queue->flush = FALSE;
283 queue->qlock = g_mutex_new ();
284 queue->item_add = g_cond_new ();
285 queue->item_del = g_cond_new ();
286 queue->event_done = g_cond_new ();
287 queue->events = g_queue_new ();
288 queue->queue = g_queue_new ();
290 GST_CAT_DEBUG_OBJECT (GST_CAT_THREAD, queue,
291 "initialized queue's not_empty & not_full conditions");
295 gst_queue_dispose (GObject *object)
297 GstQueue *queue = GST_QUEUE (object);
299 gst_element_set_state (GST_ELEMENT (queue), GST_STATE_NULL);
301 while (!g_queue_is_empty (queue->queue)) {
302 GstData *data = g_queue_pop_head (queue->queue);
303 gst_data_unref (data);
305 g_queue_free (queue->queue);
306 g_mutex_free (queue->qlock);
307 g_cond_free (queue->item_add);
308 g_cond_free (queue->item_del);
309 g_cond_free (queue->event_done);
310 while (!g_queue_is_empty (queue->events)) {
311 GstEvent *event = g_queue_pop_head (queue->events);
312 gst_event_unref (event);
315 if (G_OBJECT_CLASS (parent_class)->dispose)
316 G_OBJECT_CLASS (parent_class)->dispose (object);
320 gst_queue_getcaps (GstPad *pad)
324 queue = GST_QUEUE (gst_pad_get_parent (pad));
326 if (queue->cur_level.bytes > 0) {
327 return gst_caps_copy (queue->negotiated_caps);
330 return gst_pad_proxy_getcaps (pad);
333 static GstPadLinkReturn
334 gst_queue_link (GstPad *pad, const GstCaps *caps)
337 GstPadLinkReturn link_ret;
339 queue = GST_QUEUE (gst_pad_get_parent (pad));
341 if (queue->cur_level.bytes > 0) {
342 if (gst_caps_is_equal_fixed (caps, queue->negotiated_caps)) {
343 return GST_PAD_LINK_OK;
345 return GST_PAD_LINK_REFUSED;
348 link_ret = gst_pad_proxy_pad_link (pad, caps);
350 if (GST_PAD_LINK_SUCCESSFUL (link_ret)) {
351 /* we store an extra copy of the negotiated caps, just in case
352 * the pads become unnegotiated while we have buffers */
353 gst_caps_replace (&queue->negotiated_caps, gst_caps_copy (caps));
360 gst_queue_locked_flush (GstQueue *queue)
362 while (!g_queue_is_empty (queue->queue)) {
363 GstData *data = g_queue_pop_head (queue->queue);
364 gst_data_unref (data);
366 queue->timeval = NULL;
367 queue->cur_level.buffers = 0;
368 queue->cur_level.bytes = 0;
369 queue->cur_level.time = 0;
371 /* make sure any pending buffers to be added are flushed too */
374 /* we deleted something... */
375 g_cond_signal (queue->item_del);
379 gst_queue_handle_pending_events (GstQueue *queue)
381 /* check for events to send upstream */
382 while (!g_queue_is_empty (queue->events)){
383 GstQueueEventResponse *er = g_queue_pop_head (queue->events);
384 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue, "sending event upstream");
385 er->ret = gst_pad_event_default (queue->srcpad, er->event);
387 g_cond_signal (queue->event_done);
388 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue, "event sent");
392 #define STATUS(queue, msg) \
393 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue, \
394 "(%s:%s) " msg ": %u of %u-%u buffers, %u of %u-%u " \
395 "bytes, %" G_GUINT64_FORMAT " of %" G_GUINT64_FORMAT \
396 "-%" G_GUINT64_FORMAT " ns, %u elements", \
397 GST_DEBUG_PAD_NAME (pad), \
398 queue->cur_level.buffers, \
399 queue->min_threshold.buffers, \
400 queue->max_size.buffers, \
401 queue->cur_level.bytes, \
402 queue->min_threshold.bytes, \
403 queue->max_size.bytes, \
404 queue->cur_level.time, \
405 queue->min_threshold.time, \
406 queue->max_size.time, \
407 queue->queue->length)
410 gst_queue_chain (GstPad *pad,
415 g_return_if_fail (pad != NULL);
416 g_return_if_fail (GST_IS_PAD (pad));
417 g_return_if_fail (data != NULL);
419 queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
422 /* we have to lock the queue since we span threads */
423 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue, "locking t:%p", g_thread_self ());
424 g_mutex_lock (queue->qlock);
425 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue, "locked t:%p", g_thread_self ());
427 gst_queue_handle_pending_events (queue);
429 /* assume don't need to flush this buffer when the queue is filled */
430 queue->flush = FALSE;
432 if (GST_IS_EVENT (data)) {
433 switch (GST_EVENT_TYPE (data)) {
434 case GST_EVENT_FLUSH:
435 STATUS (queue, "received flush event");
436 gst_queue_locked_flush (queue);
437 STATUS (queue, "after flush");
440 STATUS (queue, "received EOS");
443 /* we put the event in the queue, we don't have to act ourselves */
444 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue,
445 "adding event %p of type %d",
446 data, GST_EVENT_TYPE (data));
451 if (GST_IS_BUFFER (data))
452 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue,
453 "adding buffer %p of size %d",
454 data, GST_BUFFER_SIZE (data));
456 /* We make space available if we're "full" according to whatever
457 * the user defined as "full". Note that this only applies to buffers.
458 * We always handle events and they don't count in our statistics. */
459 if (GST_IS_BUFFER (data) &&
460 ((queue->max_size.buffers > 0 &&
461 queue->cur_level.buffers >= queue->max_size.buffers) ||
462 (queue->max_size.bytes > 0 &&
463 queue->cur_level.bytes >= queue->max_size.bytes) ||
464 (queue->max_size.time > 0 &&
465 queue->cur_level.time >= queue->max_size.time))) {
466 g_mutex_unlock (queue->qlock);
467 g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_OVERRUN], 0);
468 g_mutex_lock (queue->qlock);
470 /* how are we going to make space for this buffer? */
471 switch (queue->leaky) {
472 /* leak current buffer */
473 case GST_QUEUE_LEAK_UPSTREAM:
474 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
475 "queue is full, leaking buffer on upstream end");
476 /* now we can clean up and exit right away */
477 g_mutex_unlock (queue->qlock);
480 /* leak first buffer in the queue */
481 case GST_QUEUE_LEAK_DOWNSTREAM: {
482 /* this is a bit hacky. We'll manually iterate the list
483 * and find the first buffer from the head on. We'll
484 * unref that and "fix up" the GQueue object... */
486 GstData *leak = NULL;
488 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
489 "queue is full, leaking buffer on downstream end");
491 for (item = queue->queue->head; item != NULL; item = item->next) {
492 if (GST_IS_BUFFER (item->data)) {
498 /* if we didn't find anything, it means we have no buffers
499 * in here. That cannot happen, since we had >= 1 bufs */
502 /* Now remove it from the list, fixing up the GQueue
503 * CHECKME: is a queue->head the first or the last item? */
504 item = g_list_delete_link (queue->queue->head, item);
505 queue->queue->head = g_list_first (item);
506 queue->queue->tail = g_list_last (item);
507 queue->queue->length--;
509 /* and unref the data at the end. Twice, because we keep a ref
510 * to make things read-only. Also keep our list uptodate. */
511 queue->cur_level.bytes -= GST_BUFFER_SIZE (data);
512 queue->cur_level.buffers --;
513 if (GST_BUFFER_DURATION (data) != GST_CLOCK_TIME_NONE)
514 queue->cur_level.time -= GST_BUFFER_DURATION (data);
516 gst_data_unref (data);
517 gst_data_unref (data);
522 g_warning ("Unknown leaky type, using default");
525 /* don't leak. Instead, wait for space to be available */
526 case GST_QUEUE_NO_LEAK:
527 STATUS (queue, "pre-full wait");
529 while ((queue->max_size.buffers > 0 &&
530 queue->cur_level.buffers >= queue->max_size.buffers) ||
531 (queue->max_size.bytes > 0 &&
532 queue->cur_level.bytes >= queue->max_size.bytes) ||
533 (queue->max_size.time > 0 &&
534 queue->cur_level.time >= queue->max_size.time)) {
535 /* if there's a pending state change for this queue
536 * or its manager, switch back to iterator so bottom
537 * half of state change executes */
538 if (queue->interrupt) {
539 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue, "interrupted");
540 g_mutex_unlock (queue->qlock);
541 if (gst_scheduler_interrupt (gst_pad_get_scheduler (queue->sinkpad),
542 GST_ELEMENT (queue))) {
545 /* if we got here because we were unlocked after a
546 * flush, we don't need to add the buffer to the
549 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
550 "not adding pending buffer after flush");
553 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
554 "adding pending buffer after interrupt");
558 if (GST_STATE (queue) != GST_STATE_PLAYING) {
559 /* this means the other end is shut down. Try to
560 * signal to resolve the error */
561 if (!queue->may_deadlock) {
562 g_mutex_unlock (queue->qlock);
563 gst_data_unref (data);
564 gst_element_error (queue, CORE, THREAD, NULL,
565 ("deadlock found, shutting down source pad elements"));
566 /* we don't go to out_unref here, since we want to
567 * unref the buffer *before* calling GST_ELEMENT_ERROR */
570 GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
571 "%s: waiting for the app to restart "
572 "source pad elements",
573 GST_ELEMENT_NAME (queue));
577 /* OK, we've got a serious issue here. Imagine the situation
578 * where the puller (next element) is sending an event here,
579 * so it cannot pull events from the queue, and we cannot
580 * push data further because the queue is 'full' and therefore,
581 * we wait here (and do not handle events): deadlock! to solve
582 * that, we handle pending upstream events here, too. */
583 gst_queue_handle_pending_events (queue);
585 STATUS (queue, "waiting for item_del signal");
586 g_cond_wait (queue->item_del, queue->qlock);
587 STATUS (queue, "received item_del signal");
590 STATUS (queue, "post-full wait");
591 g_mutex_unlock (queue->qlock);
592 g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_RUNNING], 0);
593 g_mutex_lock (queue->qlock);
598 /* put the buffer on the tail of the list. We keep a reference,
599 * so that the data is read-only while in here. There's a good
600 * reason to do so: we have a size and time counter, and any
601 * modification to the content could change any of the two. */
603 g_queue_push_tail (queue->queue, data);
605 /* Note that we only add buffers (not events) to the statistics */
606 if (GST_IS_BUFFER (data)) {
607 queue->cur_level.buffers++;
608 queue->cur_level.bytes += GST_BUFFER_SIZE (data);
609 if (GST_BUFFER_DURATION (data) != GST_CLOCK_TIME_NONE)
610 queue->cur_level.time += GST_BUFFER_DURATION (data);
613 STATUS (queue, "+ level");
615 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue, "signalling item_add");
616 g_cond_signal (queue->item_add);
617 g_mutex_unlock (queue->qlock);
622 gst_data_unref (data);
627 gst_queue_get (GstPad *pad)
632 g_return_val_if_fail (pad != NULL, NULL);
633 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
635 queue = GST_QUEUE (gst_pad_get_parent (pad));
638 /* have to lock for thread-safety */
639 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue,
640 "locking t:%p", g_thread_self ());
641 g_mutex_lock (queue->qlock);
642 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue,
643 "locked t:%p", g_thread_self ());
645 if (queue->queue->length == 0 ||
646 (queue->min_threshold.buffers > 0 &&
647 queue->cur_level.buffers < queue->min_threshold.buffers) ||
648 (queue->min_threshold.bytes > 0 &&
649 queue->cur_level.bytes < queue->min_threshold.bytes) ||
650 (queue->min_threshold.time > 0 &&
651 queue->cur_level.time < queue->min_threshold.time)) {
652 g_mutex_unlock (queue->qlock);
653 g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_UNDERRUN], 0);
654 g_mutex_lock (queue->qlock);
656 STATUS (queue, "pre-empty wait");
657 while (queue->queue->length == 0 ||
658 (queue->min_threshold.buffers > 0 &&
659 queue->cur_level.buffers < queue->min_threshold.buffers) ||
660 (queue->min_threshold.bytes > 0 &&
661 queue->cur_level.bytes < queue->min_threshold.bytes) ||
662 (queue->min_threshold.time > 0 &&
663 queue->cur_level.time < queue->min_threshold.time)) {
664 /* if there's a pending state change for this queue or its
665 * manager, switch back to iterator so bottom half of state
666 * change executes. */
667 if (queue->interrupt) {
668 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue, "interrupted");
669 g_mutex_unlock (queue->qlock);
670 if (gst_scheduler_interrupt (gst_pad_get_scheduler (queue->srcpad),
671 GST_ELEMENT (queue)))
672 return GST_DATA (gst_event_new (GST_EVENT_INTERRUPT));
675 if (GST_STATE (queue) != GST_STATE_PLAYING) {
676 /* this means the other end is shut down */
677 if (!queue->may_deadlock) {
678 g_mutex_unlock (queue->qlock);
679 gst_element_error (queue, CORE, THREAD, NULL,
680 ("deadlock found, shutting down sink pad elements"));
683 GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
684 "%s: waiting for the app to restart "
685 "source pad elements",
686 GST_ELEMENT_NAME (queue));
690 STATUS (queue, "waiting for item_add");
692 if (queue->block_timeout != GST_CLOCK_TIME_NONE) {
694 g_get_current_time (&timeout);
695 g_time_val_add (&timeout, queue->block_timeout / 1000);
696 if (!g_cond_timed_wait (queue->item_add, queue->qlock, &timeout)){
697 g_mutex_unlock (queue->qlock);
698 GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
699 "Sending filler event");
700 return GST_DATA (gst_event_new_filler ());
703 g_cond_wait (queue->item_add, queue->qlock);
705 STATUS (queue, "got item_add signal");
708 STATUS (queue, "post-empty wait");
709 g_mutex_unlock (queue->qlock);
710 g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_RUNNING], 0);
711 g_mutex_lock (queue->qlock);
714 /* There's something in the list now, whatever it is */
715 data = g_queue_pop_head (queue->queue);
716 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue,
717 "retrieved data %p from queue", data);
719 if (GST_IS_BUFFER (data)) {
720 /* Update statistics */
721 queue->cur_level.buffers--;
722 queue->cur_level.bytes -= GST_BUFFER_SIZE (data);
723 if (GST_BUFFER_DURATION (data) != GST_CLOCK_TIME_NONE)
724 queue->cur_level.time -= GST_BUFFER_DURATION (data);
727 /* Now that we're done, we can lose our own reference to
728 * the item, since we're no longer in danger. */
729 gst_data_unref (data);
731 STATUS (queue, "after _get()");
733 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue, "signalling item_del");
734 g_cond_signal (queue->item_del);
735 g_mutex_unlock (queue->qlock);
737 /* FIXME: I suppose this needs to be locked, since the EOS
738 * bit affects the pipeline state. However, that bit is
739 * locked too so it'd cause a deadlock. */
740 if (GST_IS_EVENT (data)) {
741 GstEvent *event = GST_EVENT (data);
742 switch (GST_EVENT_TYPE (event)) {
744 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
746 GST_ELEMENT_NAME (queue));
747 gst_element_set_eos (GST_ELEMENT (queue));
759 gst_queue_handle_src_event (GstPad *pad,
762 GstQueue *queue = GST_QUEUE (gst_pad_get_parent (pad));
765 g_mutex_lock (queue->qlock);
767 if (gst_element_get_state (GST_ELEMENT (queue)) == GST_STATE_PLAYING) {
768 GstQueueEventResponse er;
770 /* push the event to the queue and wait for upstream consumption */
773 g_queue_push_tail (queue->events, &er);
774 GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
775 "Preparing for loop for event handler");
776 /* see the chain function on why this is here - it prevents a deadlock */
777 g_cond_signal (queue->item_del);
778 while (!er.handled) {
780 g_get_current_time (&timeout);
781 g_time_val_add (&timeout, 500 * 1000); /* half a second */
782 if (!g_cond_timed_wait (queue->event_done, queue->qlock, &timeout) &&
784 GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
785 "timeout in upstream event handling");
786 /* remove ourselves from the pending list. Since we're
787 * locked, others cannot reference this anymore. */
788 queue->queue->head = g_list_remove (queue->queue->head, &er);
789 queue->queue->head = g_list_first (queue->queue->head);
790 queue->queue->tail = g_list_last (queue->queue->head);
791 queue->queue->length--;
796 GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
800 res = gst_pad_event_default (pad, event);
802 switch (GST_EVENT_TYPE (event)) {
803 case GST_EVENT_FLUSH:
804 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
805 "FLUSH event, flushing queue\n");
806 gst_queue_locked_flush (queue);
809 if (GST_EVENT_SEEK_FLAGS (event) & GST_SEEK_FLAG_FLUSH) {
810 gst_queue_locked_flush (queue);
817 g_mutex_unlock (queue->qlock);
823 gst_queue_release_locks (GstElement *element)
827 queue = GST_QUEUE (element);
829 g_mutex_lock (queue->qlock);
830 queue->interrupt = TRUE;
831 g_cond_signal (queue->item_add);
832 g_cond_signal (queue->item_del);
833 g_mutex_unlock (queue->qlock);
838 static GstElementStateReturn
839 gst_queue_change_state (GstElement *element)
842 GstElementStateReturn ret = GST_STATE_SUCCESS;
844 queue = GST_QUEUE (element);
846 GST_CAT_LOG_OBJECT (GST_CAT_STATES, element, "starting state change");
848 /* lock the queue so another thread (not in sync with this thread's state)
849 * can't call this queue's _get (or whatever)
851 g_mutex_lock (queue->qlock);
853 switch (GST_STATE_TRANSITION (element)) {
854 case GST_STATE_NULL_TO_READY:
855 gst_queue_locked_flush (queue);
857 case GST_STATE_PAUSED_TO_PLAYING:
858 if (!GST_PAD_IS_LINKED (queue->sinkpad)) {
859 GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, queue,
860 "queue %s is not linked",
861 GST_ELEMENT_NAME (queue));
862 /* FIXME can this be? */
863 g_cond_signal (queue->item_add);
865 ret = GST_STATE_FAILURE;
868 GstScheduler *src_sched, *sink_sched;
870 src_sched = gst_pad_get_scheduler (GST_PAD (queue->srcpad));
871 sink_sched = gst_pad_get_scheduler (GST_PAD (queue->sinkpad));
873 if (src_sched == sink_sched) {
874 GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, queue,
875 "queue %s does not connect different schedulers",
876 GST_ELEMENT_NAME (queue));
878 g_warning ("queue %s does not connect different schedulers",
879 GST_ELEMENT_NAME (queue));
881 ret = GST_STATE_FAILURE;
885 queue->interrupt = FALSE;
887 case GST_STATE_PAUSED_TO_READY:
888 gst_queue_locked_flush (queue);
894 if (GST_ELEMENT_CLASS (parent_class)->change_state)
895 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element);
897 /* this is an ugly hack to make sure our pads are always active.
898 * Reason for this is that pad activation for the queue element
899 * depends on 2 schedulers (ugh) */
900 gst_pad_set_active (queue->sinkpad, TRUE);
901 gst_pad_set_active (queue->srcpad, TRUE);
904 g_mutex_unlock (queue->qlock);
906 GST_CAT_LOG_OBJECT (GST_CAT_STATES, element, "done with state change");
913 gst_queue_set_property (GObject *object,
918 GstQueue *queue = GST_QUEUE (object);
920 /* someone could change levels here, and since this
921 * affects the get/put funcs, we need to lock for safety. */
922 g_mutex_lock (queue->qlock);
925 case ARG_MAX_SIZE_BYTES:
926 queue->max_size.bytes = g_value_get_uint (value);
928 case ARG_MAX_SIZE_BUFFERS:
929 queue->max_size.buffers = g_value_get_uint (value);
931 case ARG_MAX_SIZE_TIME:
932 queue->max_size.time = g_value_get_uint64 (value);
934 case ARG_MIN_THRESHOLD_BYTES:
935 queue->min_threshold.bytes = g_value_get_uint (value);
937 case ARG_MIN_THRESHOLD_BUFFERS:
938 queue->min_threshold.buffers = g_value_get_uint (value);
940 case ARG_MIN_THRESHOLD_TIME:
941 queue->min_threshold.time = g_value_get_uint64 (value);
944 queue->leaky = g_value_get_enum (value);
946 case ARG_MAY_DEADLOCK:
947 queue->may_deadlock = g_value_get_boolean (value);
949 case ARG_BLOCK_TIMEOUT:
950 queue->block_timeout = g_value_get_uint64 (value);
953 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
957 g_mutex_unlock (queue->qlock);
961 gst_queue_get_property (GObject *object,
966 GstQueue *queue = GST_QUEUE (object);
969 case ARG_CUR_LEVEL_BYTES:
970 g_value_set_uint (value, queue->cur_level.bytes);
972 case ARG_CUR_LEVEL_BUFFERS:
973 g_value_set_uint (value, queue->cur_level.buffers);
975 case ARG_CUR_LEVEL_TIME:
976 g_value_set_uint64 (value, queue->cur_level.time);
978 case ARG_MAX_SIZE_BYTES:
979 g_value_set_uint (value, queue->max_size.bytes);
981 case ARG_MAX_SIZE_BUFFERS:
982 g_value_set_uint (value, queue->max_size.buffers);
984 case ARG_MAX_SIZE_TIME:
985 g_value_set_uint64 (value, queue->max_size.time);
987 case ARG_MIN_THRESHOLD_BYTES:
988 g_value_set_uint (value, queue->min_threshold.bytes);
990 case ARG_MIN_THRESHOLD_BUFFERS:
991 g_value_set_uint (value, queue->min_threshold.buffers);
993 case ARG_MIN_THRESHOLD_TIME:
994 g_value_set_uint64 (value, queue->min_threshold.time);
997 g_value_set_enum (value, queue->leaky);
999 case ARG_MAY_DEADLOCK:
1000 g_value_set_boolean (value, queue->may_deadlock);
1002 case ARG_BLOCK_TIMEOUT:
1003 g_value_set_uint64 (value, queue->block_timeout);
1006 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);