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"
32 static GstElementDetails gst_queue_details = GST_ELEMENT_DETAILS (
36 "Erik Walthinsen <omega@cse.ogi.edu>"
40 /* Queue signals and args */
50 /* FIXME: don't we have another way of doing this
51 * "Gstreamer format" (frame/byte/time) queries? */
52 ARG_CUR_LEVEL_BUFFERS,
58 ARG_MIN_TRESHOLD_BUFFERS,
59 ARG_MIN_TRESHOLD_BYTES,
60 ARG_MIN_TRESHOLD_TIME,
67 typedef struct _GstQueueEventResponse {
69 gboolean ret, handled;
70 } GstQueueEventResponse;
72 static void gst_queue_base_init (GstQueueClass *klass);
73 static void gst_queue_class_init (GstQueueClass *klass);
74 static void gst_queue_init (GstQueue *queue);
75 static void gst_queue_dispose (GObject *object);
77 static void gst_queue_set_property (GObject *object,
81 static void gst_queue_get_property (GObject *object,
86 static GstCaps *gst_queue_getcaps (GstPad *pad);
87 static GstPadLinkReturn
88 gst_queue_link (GstPad *pad,
90 static void gst_queue_chain (GstPad *pad,
92 static GstData *gst_queue_get (GstPad *pad);
94 static gboolean gst_queue_handle_src_event (GstPad *pad,
97 static void gst_queue_locked_flush (GstQueue *queue);
99 static GstElementStateReturn
100 gst_queue_change_state (GstElement *element);
101 static gboolean gst_queue_release_locks (GstElement *element);
104 #define GST_TYPE_QUEUE_LEAKY (queue_leaky_get_type ())
107 queue_leaky_get_type (void)
109 static GType queue_leaky_type = 0;
110 static GEnumValue queue_leaky[] = {
111 { GST_QUEUE_NO_LEAK, "0", "Not Leaky" },
112 { GST_QUEUE_LEAK_UPSTREAM, "1", "Leaky on Upstream" },
113 { GST_QUEUE_LEAK_DOWNSTREAM, "2", "Leaky on Downstream" },
116 if (!queue_leaky_type) {
117 queue_leaky_type = g_enum_register_static("GstQueueLeaky", queue_leaky);
119 return queue_leaky_type;
122 static GstElementClass *parent_class = NULL;
123 static guint gst_queue_signals[LAST_SIGNAL] = { 0 };
126 gst_queue_get_type (void)
128 static GType queue_type = 0;
131 static const GTypeInfo queue_info = {
132 sizeof (GstQueueClass),
133 (GBaseInitFunc) gst_queue_base_init,
135 (GClassInitFunc) gst_queue_class_init,
140 (GInstanceInitFunc) gst_queue_init,
144 queue_type = g_type_register_static (GST_TYPE_ELEMENT,
145 "GstQueue", &queue_info, 0);
152 gst_queue_base_init (GstQueueClass *klass)
154 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
156 gst_element_class_set_details (gstelement_class, &gst_queue_details);
160 gst_queue_class_init (GstQueueClass *klass)
162 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
163 GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
165 parent_class = g_type_class_peek_parent (klass);
168 gst_queue_signals[SIGNAL_UNDERRUN] =
169 g_signal_new ("underrun", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
170 G_STRUCT_OFFSET (GstQueueClass, underrun), NULL, NULL,
171 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
172 gst_queue_signals[SIGNAL_RUNNING] =
173 g_signal_new ("running", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
174 G_STRUCT_OFFSET (GstQueueClass, running), NULL, NULL,
175 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
176 gst_queue_signals[SIGNAL_OVERRUN] =
177 g_signal_new ("overrun", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_FIRST,
178 G_STRUCT_OFFSET (GstQueueClass, overrun), NULL, NULL,
179 g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0);
182 g_object_class_install_property (gobject_class, ARG_CUR_LEVEL_BYTES,
183 g_param_spec_uint ("current-level-bytes", "Current level (kB)",
184 "Current amount of data in the queue (bytes)",
185 0, G_MAXUINT, 0, G_PARAM_READABLE));
186 g_object_class_install_property (gobject_class, ARG_CUR_LEVEL_BUFFERS,
187 g_param_spec_uint ("current-level-buffers", "Current level (buffers)",
188 "Current number of buffers in the queue",
189 0, G_MAXUINT, 0, G_PARAM_READABLE));
190 g_object_class_install_property (gobject_class, ARG_CUR_LEVEL_TIME,
191 g_param_spec_uint64 ("current-level-time", "Current level (ns)",
192 "Current amount of data in the queue (in ns)",
193 0, G_MAXUINT64, 0, G_PARAM_READABLE));
195 g_object_class_install_property (gobject_class, ARG_MAX_SIZE_BYTES,
196 g_param_spec_uint ("max-size-bytes", "Max. size (kB)",
197 "Max. amount of data in the queue (bytes, 0=disable)",
198 0, G_MAXUINT, 0, G_PARAM_READWRITE));
199 g_object_class_install_property (gobject_class, ARG_MAX_SIZE_BUFFERS,
200 g_param_spec_uint ("max-size-buffers", "Max. size (buffers)",
201 "Max. number of buffers in the queue (0=disable)",
202 0, G_MAXUINT, 0, G_PARAM_READWRITE));
203 g_object_class_install_property (gobject_class, ARG_MAX_SIZE_TIME,
204 g_param_spec_uint64 ("max-size-time", "Max. size (ns)",
205 "Max. amount of data in the queue (in ns, 0=disable)",
206 0, G_MAXUINT64, 0, G_PARAM_READWRITE));
208 g_object_class_install_property (gobject_class, ARG_MIN_TRESHOLD_BYTES,
209 g_param_spec_uint ("min-treshold-bytes", "Min. treshold (kB)",
210 "Min. amount of data in the queue to allow reading (bytes, 0=disable)",
211 0, G_MAXUINT, 0, G_PARAM_READWRITE));
212 g_object_class_install_property (gobject_class, ARG_MIN_TRESHOLD_BUFFERS,
213 g_param_spec_uint ("min-treshold-buffers", "Min. treshold (buffers)",
214 "Min. number of buffers in the queue to allow reading (0=disable)",
215 0, G_MAXUINT, 0, G_PARAM_READWRITE));
216 g_object_class_install_property (gobject_class, ARG_MIN_TRESHOLD_TIME,
217 g_param_spec_uint64 ("min-treshold-time", "Min. treshold (ns)",
218 "Min. amount of data in the queue to allow reading (in ns, 0=disable)",
219 0, G_MAXUINT64, 0, G_PARAM_READWRITE));
221 g_object_class_install_property (gobject_class, ARG_LEAKY,
222 g_param_spec_enum ("leaky", "Leaky",
223 "Where the queue leaks, if at all",
224 GST_TYPE_QUEUE_LEAKY, GST_QUEUE_NO_LEAK, G_PARAM_READWRITE));
225 g_object_class_install_property (gobject_class, ARG_MAY_DEADLOCK,
226 g_param_spec_boolean ("may_deadlock", "May Deadlock",
227 "The queue may deadlock if it's full and not PLAYING",
228 TRUE, G_PARAM_READWRITE));
229 g_object_class_install_property (gobject_class, ARG_BLOCK_TIMEOUT,
230 g_param_spec_uint64 ("block_timeout", "Timeout for Block",
231 "Nanoseconds until blocked queue times out and returns filler event. "
232 "Value of -1 disables timeout",
233 0, G_MAXUINT64, -1, G_PARAM_READWRITE));
235 /* set several parent class virtual functions */
236 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_queue_dispose);
237 gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_queue_set_property);
238 gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_queue_get_property);
240 gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_queue_change_state);
241 gstelement_class->release_locks = GST_DEBUG_FUNCPTR (gst_queue_release_locks);
245 gst_queue_init (GstQueue *queue)
247 /* scheduling on this kind of element is, well, interesting */
248 GST_FLAG_SET (queue, GST_ELEMENT_DECOUPLED);
249 GST_FLAG_SET (queue, GST_ELEMENT_EVENT_AWARE);
251 queue->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
252 gst_pad_set_chain_function (queue->sinkpad, GST_DEBUG_FUNCPTR (gst_queue_chain));
253 gst_element_add_pad (GST_ELEMENT (queue), queue->sinkpad);
254 gst_pad_set_link_function (queue->sinkpad, GST_DEBUG_FUNCPTR (gst_queue_link));
255 gst_pad_set_getcaps_function (queue->sinkpad, GST_DEBUG_FUNCPTR (gst_queue_getcaps));
256 gst_pad_set_active (queue->sinkpad, TRUE);
258 queue->srcpad = gst_pad_new ("src", GST_PAD_SRC);
259 gst_pad_set_get_function (queue->srcpad, GST_DEBUG_FUNCPTR (gst_queue_get));
260 gst_element_add_pad (GST_ELEMENT (queue), queue->srcpad);
261 gst_pad_set_link_function (queue->srcpad, GST_DEBUG_FUNCPTR (gst_queue_link));
262 gst_pad_set_getcaps_function (queue->srcpad, GST_DEBUG_FUNCPTR (gst_queue_getcaps));
263 gst_pad_set_event_function (queue->srcpad, GST_DEBUG_FUNCPTR (gst_queue_handle_src_event));
264 gst_pad_set_active (queue->srcpad, TRUE);
266 queue->cur_level.buffers = 0; /* no content */
267 queue->cur_level.bytes = 0; /* no content */
268 queue->cur_level.time = 0; /* no content */
269 queue->max_size.buffers = 100; /* max. 100 buffers */
270 queue->max_size.bytes = 1024 * 1024; /* max. 1 MB */
271 queue->max_size.time = GST_SECOND; /* max. 1 sec. */
272 queue->min_treshold.buffers = 0; /* no treshold */
273 queue->min_treshold.bytes = 0; /* no treshold */
274 queue->min_treshold.time = 0; /* no treshold */
276 queue->leaky = GST_QUEUE_NO_LEAK;
277 queue->may_deadlock = TRUE;
278 queue->block_timeout = GST_CLOCK_TIME_NONE;
279 queue->interrupt = FALSE;
280 queue->flush = FALSE;
282 queue->qlock = g_mutex_new ();
283 queue->item_add = g_cond_new ();
284 queue->item_del = g_cond_new ();
285 queue->event_done = g_cond_new ();
286 queue->events = g_queue_new ();
287 queue->queue = g_queue_new ();
289 GST_CAT_DEBUG_OBJECT (GST_CAT_THREAD, queue,
290 "initialized queue's not_empty & not_full conditions");
294 gst_queue_dispose (GObject *object)
296 GstQueue *queue = GST_QUEUE (object);
298 gst_element_set_state (GST_ELEMENT (queue), GST_STATE_NULL);
300 while (!g_queue_is_empty (queue->queue)) {
301 GstData *data = g_queue_pop_head (queue->queue);
302 gst_data_unref (data);
304 g_queue_free (queue->queue);
305 g_mutex_free (queue->qlock);
306 g_cond_free (queue->item_add);
307 g_cond_free (queue->item_del);
308 g_cond_free (queue->event_done);
309 while (!g_queue_is_empty (queue->events)) {
310 GstEvent *event = g_queue_pop_head (queue->events);
311 gst_event_unref (event);
314 if (G_OBJECT_CLASS (parent_class)->dispose)
315 G_OBJECT_CLASS (parent_class)->dispose (object);
319 gst_queue_otherpad (GstPad *pad)
321 GstQueue *queue = GST_QUEUE (gst_pad_get_parent (pad));
324 if (pad == queue->srcpad)
325 otherpad = queue->sinkpad;
327 otherpad = queue->srcpad;
332 static GstPadLinkReturn
333 gst_queue_link (GstPad *pad, const GstCaps *caps)
335 return gst_pad_proxy_link (gst_queue_otherpad (pad), caps);
339 gst_queue_getcaps (GstPad *pad)
341 GstPad *otherpad = GST_PAD_PEER (gst_queue_otherpad (pad));
344 return gst_pad_get_caps (otherpad);
346 return gst_caps_new_any ();
350 gst_queue_locked_flush (GstQueue *queue)
352 while (!g_queue_is_empty (queue->queue)) {
353 GstData *data = g_queue_pop_head (queue->queue);
354 gst_data_unref (data);
356 queue->timeval = NULL;
357 queue->cur_level.buffers = 0;
358 queue->cur_level.bytes = 0;
359 queue->cur_level.time = 0;
361 /* make sure any pending buffers to be added are flushed too */
364 /* we deleted something... */
365 g_cond_signal (queue->item_del);
369 gst_queue_handle_pending_events (GstQueue *queue)
371 /* check for events to send upstream */
372 while (!g_queue_is_empty (queue->events)){
373 GstQueueEventResponse *er = g_queue_pop_head (queue->events);
374 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue, "sending event upstream");
375 er->ret = gst_pad_event_default (queue->srcpad, er->event);
377 g_cond_signal (queue->event_done);
378 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue, "event sent");
382 #define STATUS(queue, msg) \
383 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue, \
384 "(%s:%s) " msg ": %u of %u-%u buffers, %u of %u-%u " \
385 "bytes, %" G_GUINT64_FORMAT " of %" G_GUINT64_FORMAT \
386 "-%" G_GUINT64_FORMAT " ns, %u elements", \
387 GST_DEBUG_PAD_NAME (pad), \
388 queue->cur_level.buffers, \
389 queue->min_treshold.buffers, \
390 queue->max_size.buffers, \
391 queue->cur_level.bytes, \
392 queue->min_treshold.bytes, \
393 queue->max_size.bytes, \
394 queue->cur_level.time, \
395 queue->min_treshold.time, \
396 queue->max_size.time, \
397 queue->queue->length)
400 gst_queue_chain (GstPad *pad,
405 g_return_if_fail (pad != NULL);
406 g_return_if_fail (GST_IS_PAD (pad));
407 g_return_if_fail (data != NULL);
409 queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
412 /* we have to lock the queue since we span threads */
413 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue, "locking t:%p", g_thread_self ());
414 g_mutex_lock (queue->qlock);
415 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue, "locked t:%p", g_thread_self ());
417 gst_queue_handle_pending_events (queue);
419 /* assume don't need to flush this buffer when the queue is filled */
420 queue->flush = FALSE;
422 if (GST_IS_EVENT (data)) {
423 switch (GST_EVENT_TYPE (data)) {
424 case GST_EVENT_FLUSH:
425 STATUS (queue, "received flush event");
426 gst_queue_locked_flush (queue);
427 STATUS (queue, "after flush");
430 STATUS (queue, "received EOS");
433 /* we put the event in the queue, we don't have to act ourselves */
434 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue,
435 "adding event %p of type %d",
436 data, GST_EVENT_TYPE (data));
441 if (GST_IS_BUFFER (data))
442 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue,
443 "adding buffer %p of size %d",
444 data, GST_BUFFER_SIZE (data));
446 /* We make space available if we're "full" according to whatever
447 * the user defined as "full". Note that this only applies to buffers.
448 * We always handle events and they don't count in our statistics. */
449 if (GST_IS_BUFFER (data) &&
450 ((queue->max_size.buffers > 0 &&
451 queue->cur_level.buffers >= queue->max_size.buffers) ||
452 (queue->max_size.bytes > 0 &&
453 queue->cur_level.bytes >= queue->max_size.bytes) ||
454 (queue->max_size.time > 0 &&
455 queue->cur_level.time >= queue->max_size.time))) {
456 g_mutex_unlock (queue->qlock);
457 g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_OVERRUN], 0);
458 g_mutex_lock (queue->qlock);
460 /* how are we going to make space for this buffer? */
461 switch (queue->leaky) {
462 /* leak current buffer */
463 case GST_QUEUE_LEAK_UPSTREAM:
464 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
465 "queue is full, leaking buffer on upstream end");
466 /* now we can clean up and exit right away */
467 g_mutex_unlock (queue->qlock);
470 /* leak first buffer in the queue */
471 case GST_QUEUE_LEAK_DOWNSTREAM: {
472 /* this is a bit hacky. We'll manually iterate the list
473 * and find the first buffer from the head on. We'll
474 * unref that and "fix up" the GQueue object... */
476 GstData *leak = NULL;
478 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
479 "queue is full, leaking buffer on downstream end");
481 for (item = queue->queue->head; item != NULL; item = item->next) {
482 if (GST_IS_BUFFER (item->data)) {
488 /* if we didn't find anything, it means we have no buffers
489 * in here. That cannot happen, since we had >= 1 bufs */
492 /* Now remove it from the list, fixing up the GQueue
493 * CHECKME: is a queue->head the first or the last item? */
494 item = g_list_delete_link (queue->queue->head, item);
495 queue->queue->head = g_list_first (item);
496 queue->queue->tail = g_list_last (item);
497 queue->queue->length--;
499 /* and unref the data at the end. Twice, because we keep a ref
500 * to make things read-only. Also keep our list uptodate. */
501 queue->cur_level.bytes -= GST_BUFFER_SIZE (data);
502 queue->cur_level.buffers --;
503 if (GST_BUFFER_DURATION (data) != GST_CLOCK_TIME_NONE)
504 queue->cur_level.time -= GST_BUFFER_DURATION (data);
506 gst_data_unref (data);
507 gst_data_unref (data);
512 g_warning ("Unknown leaky type, using default");
515 /* don't leak. Instead, wait for space to be available */
516 case GST_QUEUE_NO_LEAK:
517 STATUS (queue, "pre-full wait");
519 while ((queue->max_size.buffers > 0 &&
520 queue->cur_level.buffers >= queue->max_size.buffers) ||
521 (queue->max_size.bytes > 0 &&
522 queue->cur_level.bytes >= queue->max_size.bytes) ||
523 (queue->max_size.time > 0 &&
524 queue->cur_level.time >= queue->max_size.time)) {
525 /* if there's a pending state change for this queue
526 * or its manager, switch back to iterator so bottom
527 * half of state change executes */
528 if (queue->interrupt) {
529 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue, "interrupted");
530 g_mutex_unlock (queue->qlock);
531 if (gst_scheduler_interrupt (gst_pad_get_scheduler (queue->sinkpad),
532 GST_ELEMENT (queue))) {
535 /* if we got here because we were unlocked after a
536 * flush, we don't need to add the buffer to the
539 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
540 "not adding pending buffer after flush");
543 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
544 "adding pending buffer after interrupt");
548 if (GST_STATE (queue) != GST_STATE_PLAYING) {
549 /* this means the other end is shut down. Try to
550 * signal to resolve the error */
551 if (!queue->may_deadlock) {
552 g_mutex_unlock (queue->qlock);
553 gst_data_unref (data);
554 gst_element_error (GST_ELEMENT (queue),
555 "deadlock found, source pad elements are shut down");
556 /* we don't go to out_unref here, since we want to
557 * unref the buffer *before* calling gst_element_error */
560 GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
561 "%s: waiting for the app to restart "
562 "source pad elements",
563 GST_ELEMENT_NAME (queue));
567 /* OK, we've got a serious issue here. Imagine the situation
568 * where the puller (next element) is sending an event here,
569 * so it cannot pull events from the queue, and we cannot
570 * push data further because the queue is 'full' and therefore,
571 * we wait here (and do not handle events): deadlock! to solve
572 * that, we handle pending upstream events here, too. */
573 gst_queue_handle_pending_events (queue);
575 STATUS (queue, "waiting for item_del signal");
576 g_cond_wait (queue->item_del, queue->qlock);
577 STATUS (queue, "received item_del signal");
580 STATUS (queue, "post-full wait");
581 g_mutex_unlock (queue->qlock);
582 g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_RUNNING], 0);
583 g_mutex_lock (queue->qlock);
588 /* put the buffer on the tail of the list. We keep a reference,
589 * so that the data is read-only while in here. There's a good
590 * reason to do so: we have a size and time counter, and any
591 * modification to the content could change any of the two. */
593 g_queue_push_tail (queue->queue, data);
595 /* Note that we only add buffers (not events) to the statistics */
596 if (GST_IS_BUFFER (data)) {
597 queue->cur_level.buffers++;
598 queue->cur_level.bytes += GST_BUFFER_SIZE (data);
599 if (GST_BUFFER_DURATION (data) != GST_CLOCK_TIME_NONE)
600 queue->cur_level.time += GST_BUFFER_DURATION (data);
603 STATUS (queue, "+ level");
605 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue, "signalling item_add");
606 g_cond_signal (queue->item_add);
607 g_mutex_unlock (queue->qlock);
612 gst_data_unref (data);
617 gst_queue_get (GstPad *pad)
622 g_return_val_if_fail (pad != NULL, NULL);
623 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
625 queue = GST_QUEUE (gst_pad_get_parent (pad));
628 /* have to lock for thread-safety */
629 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue,
630 "locking t:%p", g_thread_self ());
631 g_mutex_lock (queue->qlock);
632 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue,
633 "locked t:%p", g_thread_self ());
635 if (queue->queue->length == 0 ||
636 (queue->min_treshold.buffers > 0 &&
637 queue->cur_level.buffers < queue->min_treshold.buffers) ||
638 (queue->min_treshold.bytes > 0 &&
639 queue->cur_level.bytes < queue->min_treshold.bytes) ||
640 (queue->min_treshold.time > 0 &&
641 queue->cur_level.time < queue->min_treshold.time)) {
642 g_mutex_unlock (queue->qlock);
643 g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_UNDERRUN], 0);
644 g_mutex_lock (queue->qlock);
646 STATUS (queue, "pre-empty wait");
647 while (queue->queue->length == 0 ||
648 (queue->min_treshold.buffers > 0 &&
649 queue->cur_level.buffers < queue->min_treshold.buffers) ||
650 (queue->min_treshold.bytes > 0 &&
651 queue->cur_level.bytes < queue->min_treshold.bytes) ||
652 (queue->min_treshold.time > 0 &&
653 queue->cur_level.time < queue->min_treshold.time)) {
654 /* if there's a pending state change for this queue or its
655 * manager, switch back to iterator so bottom half of state
656 * change executes. */
657 if (queue->interrupt) {
658 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue, "interrupted");
659 g_mutex_unlock (queue->qlock);
660 if (gst_scheduler_interrupt (gst_pad_get_scheduler (queue->srcpad),
661 GST_ELEMENT (queue)))
662 return GST_DATA (gst_event_new (GST_EVENT_INTERRUPT));
665 if (GST_STATE (queue) != GST_STATE_PLAYING) {
666 /* this means the other end is shut down */
667 if (!queue->may_deadlock) {
668 g_mutex_unlock (queue->qlock);
669 gst_element_error (GST_ELEMENT (queue),
670 "deadlock found, sink pad elements are shut down");
673 GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
674 "%s: waiting for the app to restart "
675 "source pad elements",
676 GST_ELEMENT_NAME (queue));
680 STATUS (queue, "waiting for item_add");
682 if (queue->block_timeout != GST_CLOCK_TIME_NONE) {
684 g_get_current_time (&timeout);
685 g_time_val_add (&timeout, queue->block_timeout / 1000);
686 if (!g_cond_timed_wait (queue->item_add, queue->qlock, &timeout)){
687 g_mutex_unlock (queue->qlock);
688 GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
689 "Sending filler event");
690 return GST_DATA (gst_event_new_filler ());
693 g_cond_wait (queue->item_add, queue->qlock);
695 STATUS (queue, "got item_add signal");
698 STATUS (queue, "post-empty wait");
699 g_mutex_unlock (queue->qlock);
700 g_signal_emit (G_OBJECT (queue), gst_queue_signals[SIGNAL_RUNNING], 0);
701 g_mutex_lock (queue->qlock);
704 /* There's something in the list now, whatever it is */
705 data = g_queue_pop_head (queue->queue);
706 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue,
707 "retrieved data %p from queue", data);
709 if (GST_IS_BUFFER (data)) {
710 /* Update statistics */
711 queue->cur_level.buffers--;
712 queue->cur_level.bytes -= GST_BUFFER_SIZE (data);
713 if (GST_BUFFER_DURATION (data) != GST_CLOCK_TIME_NONE)
714 queue->cur_level.time -= GST_BUFFER_DURATION (data);
717 /* Now that we're done, we can lose our own reference to
718 * the item, since we're no longer in danger. */
719 gst_data_unref (data);
721 STATUS (queue, "after _get()");
723 GST_CAT_LOG_OBJECT (GST_CAT_DATAFLOW, queue, "signalling item_del");
724 g_cond_signal (queue->item_del);
725 g_mutex_unlock (queue->qlock);
727 /* FIXME: I suppose this needs to be locked, since the EOS
728 * bit affects the pipeline state. However, that bit is
729 * locked too so it'd cause a deadlock. */
730 if (GST_IS_EVENT (data)) {
731 GstEvent *event = GST_EVENT (data);
732 switch (GST_EVENT_TYPE (event)) {
734 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
736 GST_ELEMENT_NAME (queue));
737 gst_element_set_eos (GST_ELEMENT (queue));
749 gst_queue_handle_src_event (GstPad *pad,
752 GstQueue *queue = GST_QUEUE (gst_pad_get_parent (pad));
755 g_mutex_lock (queue->qlock);
757 if (gst_element_get_state (GST_ELEMENT (queue)) == GST_STATE_PLAYING) {
758 GstQueueEventResponse er;
760 /* push the event to the queue and wait for upstream consumption */
763 g_queue_push_tail (queue->events, &er);
764 GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
765 "Preparing for loop for event handler");
766 /* see the chain function on why this is here - it prevents a deadlock */
767 g_cond_signal (queue->item_del);
768 while (!er.handled) {
770 g_get_current_time (&timeout);
771 g_time_val_add (&timeout, 500 * 1000); /* half a second */
772 if (!g_cond_timed_wait (queue->event_done, queue->qlock, &timeout) &&
774 GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
775 "timeout in upstream event handling");
776 /* remove ourselves from the pending list. Since we're
777 * locked, others cannot reference this anymore. */
778 queue->queue->head = g_list_remove (queue->queue->head, &er);
779 queue->queue->head = g_list_first (queue->queue->head);
780 queue->queue->tail = g_list_last (queue->queue->head);
781 queue->queue->length--;
786 GST_CAT_WARNING_OBJECT (GST_CAT_DATAFLOW, queue,
790 res = gst_pad_event_default (pad, event);
792 switch (GST_EVENT_TYPE (event)) {
793 case GST_EVENT_FLUSH:
794 GST_CAT_DEBUG_OBJECT (GST_CAT_DATAFLOW, queue,
795 "FLUSH event, flushing queue\n");
796 gst_queue_locked_flush (queue);
799 if (GST_EVENT_SEEK_FLAGS (event) & GST_SEEK_FLAG_FLUSH) {
800 gst_queue_locked_flush (queue);
807 g_mutex_unlock (queue->qlock);
813 gst_queue_release_locks (GstElement *element)
817 queue = GST_QUEUE (element);
819 g_mutex_lock (queue->qlock);
820 queue->interrupt = TRUE;
821 g_cond_signal (queue->item_add);
822 g_cond_signal (queue->item_del);
823 g_mutex_unlock (queue->qlock);
828 static GstElementStateReturn
829 gst_queue_change_state (GstElement *element)
832 GstElementStateReturn ret = GST_STATE_SUCCESS;
834 queue = GST_QUEUE (element);
836 GST_CAT_LOG_OBJECT (GST_CAT_STATES, element, "starting state change");
838 /* lock the queue so another thread (not in sync with this thread's state)
839 * can't call this queue's _get (or whatever)
841 g_mutex_lock (queue->qlock);
843 switch (GST_STATE_TRANSITION (element)) {
844 case GST_STATE_NULL_TO_READY:
845 gst_queue_locked_flush (queue);
847 case GST_STATE_PAUSED_TO_PLAYING:
848 if (!GST_PAD_IS_LINKED (queue->sinkpad)) {
849 GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, queue,
850 "queue %s is not linked",
851 GST_ELEMENT_NAME (queue));
852 /* FIXME can this be? */
853 g_cond_signal (queue->item_add);
855 ret = GST_STATE_FAILURE;
858 GstScheduler *src_sched, *sink_sched;
860 src_sched = gst_pad_get_scheduler (GST_PAD (queue->srcpad));
861 sink_sched = gst_pad_get_scheduler (GST_PAD (queue->sinkpad));
863 if (src_sched == sink_sched) {
864 GST_CAT_DEBUG_OBJECT (GST_CAT_STATES, queue,
865 "queue %s does not connect different schedulers",
866 GST_ELEMENT_NAME (queue));
868 g_warning ("queue %s does not connect different schedulers",
869 GST_ELEMENT_NAME (queue));
871 ret = GST_STATE_FAILURE;
875 queue->interrupt = FALSE;
877 case GST_STATE_PAUSED_TO_READY:
878 gst_queue_locked_flush (queue);
884 if (GST_ELEMENT_CLASS (parent_class)->change_state)
885 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element);
887 /* this is an ugly hack to make sure our pads are always active.
888 * Reason for this is that pad activation for the queue element
889 * depends on 2 schedulers (ugh) */
890 gst_pad_set_active (queue->sinkpad, TRUE);
891 gst_pad_set_active (queue->srcpad, TRUE);
894 g_mutex_unlock (queue->qlock);
896 GST_CAT_LOG_OBJECT (GST_CAT_STATES, element, "done with state change");
903 gst_queue_set_property (GObject *object,
908 GstQueue *queue = GST_QUEUE (object);
910 /* someone could change levels here, and since this
911 * affects the get/put funcs, we need to lock for safety. */
912 g_mutex_lock (queue->qlock);
915 case ARG_MAX_SIZE_BYTES:
916 queue->max_size.bytes = g_value_get_uint (value);
918 case ARG_MAX_SIZE_BUFFERS:
919 queue->max_size.buffers = g_value_get_uint (value);
921 case ARG_MAX_SIZE_TIME:
922 queue->max_size.time = g_value_get_uint64 (value);
924 case ARG_MIN_TRESHOLD_BYTES:
925 queue->max_size.bytes = g_value_get_uint (value);
927 case ARG_MIN_TRESHOLD_BUFFERS:
928 queue->max_size.buffers = g_value_get_uint (value);
930 case ARG_MIN_TRESHOLD_TIME:
931 queue->max_size.time = g_value_get_uint64 (value);
934 queue->leaky = g_value_get_enum (value);
936 case ARG_MAY_DEADLOCK:
937 queue->may_deadlock = g_value_get_boolean (value);
939 case ARG_BLOCK_TIMEOUT:
940 queue->block_timeout = g_value_get_uint64 (value);
943 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
947 g_mutex_unlock (queue->qlock);
951 gst_queue_get_property (GObject *object,
956 GstQueue *queue = GST_QUEUE (object);
959 case ARG_CUR_LEVEL_BYTES:
960 g_value_set_uint (value, queue->cur_level.bytes);
962 case ARG_CUR_LEVEL_BUFFERS:
963 g_value_set_uint (value, queue->cur_level.buffers);
965 case ARG_CUR_LEVEL_TIME:
966 g_value_set_uint64 (value, queue->cur_level.time);
968 case ARG_MAX_SIZE_BYTES:
969 g_value_set_uint (value, queue->max_size.bytes);
971 case ARG_MAX_SIZE_BUFFERS:
972 g_value_set_uint (value, queue->max_size.buffers);
974 case ARG_MAX_SIZE_TIME:
975 g_value_set_uint64 (value, queue->max_size.time);
977 case ARG_MIN_TRESHOLD_BYTES:
978 g_value_set_uint (value, queue->min_treshold.bytes);
980 case ARG_MIN_TRESHOLD_BUFFERS:
981 g_value_set_uint (value, queue->min_treshold.buffers);
983 case ARG_MIN_TRESHOLD_TIME:
984 g_value_set_uint64 (value, queue->min_treshold.time);
987 g_value_set_enum (value, queue->leaky);
989 case ARG_MAY_DEADLOCK:
990 g_value_set_boolean (value, queue->may_deadlock);
992 case ARG_BLOCK_TIMEOUT:
993 g_value_set_uint64 (value, queue->block_timeout);
996 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);