2 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
3 * 2000 Wim Taymans <wtay@chello.be>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
23 //#define DEBUG_ENABLED
24 //#define STATUS_ENABLED
26 #define STATUS(A) GST_DEBUG(GST_CAT_DATAFLOW, A, GST_ELEMENT_NAME(queue))
34 #include "gst_private.h"
37 #include "gstscheduler.h"
39 GstElementDetails gst_queue_details = {
44 "Erik Walthinsen <omega@cse.ogi.edu>",
49 /* Queue signals and args */
70 static void gst_queue_class_init (GstQueueClass *klass);
71 static void gst_queue_init (GstQueue *queue);
73 static void gst_queue_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
74 static void gst_queue_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
76 static GstPadNegotiateReturn gst_queue_handle_negotiate_src (GstPad *pad, GstCaps **caps, gpointer *data);
77 static GstPadNegotiateReturn gst_queue_handle_negotiate_sink (GstPad *pad, GstCaps **caps, gpointer *data);
78 static void gst_queue_chain (GstPad *pad, GstBuffer *buf);
79 static GstBuffer * gst_queue_get (GstPad *pad);
80 static GstBufferPool* gst_queue_get_bufferpool (GstPad *pad);
82 static void gst_queue_flush (GstQueue *queue);
84 static GstElementStateReturn gst_queue_change_state (GstElement *element);
88 queue_leaky_get_type(void) {
89 static GType queue_leaky_type = 0;
90 static GEnumValue queue_leaky[] = {
91 { GST_QUEUE_NO_LEAK, "0", "Not Leaky" },
92 { GST_QUEUE_LEAK_UPSTREAM, "1", "Leaky on Upstream" },
93 { GST_QUEUE_LEAK_DOWNSTREAM, "2", "Leaky on Downstream" },
96 if (!queue_leaky_type) {
97 queue_leaky_type = g_enum_register_static("GstQueueLeaky", queue_leaky);
99 return queue_leaky_type;
101 #define GST_TYPE_QUEUE_LEAKY (queue_leaky_get_type())
104 static GstElementClass *parent_class = NULL;
105 //static guint gst_queue_signals[LAST_SIGNAL] = { 0 };
108 gst_queue_get_type(void) {
109 static GType queue_type = 0;
112 static const GTypeInfo queue_info = {
113 sizeof(GstQueueClass),
116 (GClassInitFunc)gst_queue_class_init,
121 (GInstanceInitFunc)gst_queue_init,
123 queue_type = g_type_register_static (GST_TYPE_ELEMENT, "GstQueue", &queue_info, 0);
129 gst_queue_class_init (GstQueueClass *klass)
131 GObjectClass *gobject_class;
132 GstElementClass *gstelement_class;
134 gobject_class = (GObjectClass*)klass;
135 gstelement_class = (GstElementClass*)klass;
137 parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
139 g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_LEAKY,
140 g_param_spec_enum("leaky","Leaky","Where the queue leaks, if at all.",
141 GST_TYPE_QUEUE_LEAKY,GST_QUEUE_NO_LEAK,G_PARAM_READWRITE));
142 g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_LEVEL,
143 g_param_spec_int("level","Level","How many buffers are in the queue.",
144 0,G_MAXINT,0,G_PARAM_READABLE));
145 g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_MAX_LEVEL,
146 g_param_spec_int("max_level","Maximum Level","How many buffers the queue holds.",
147 0,G_MAXINT,100,G_PARAM_READWRITE));
149 gobject_class->set_property = GST_DEBUG_FUNCPTR(gst_queue_set_property);
150 gobject_class->get_property = GST_DEBUG_FUNCPTR(gst_queue_get_property);
152 gstelement_class->change_state = GST_DEBUG_FUNCPTR(gst_queue_change_state);
156 gst_queue_init (GstQueue *queue)
158 // scheduling on this kind of element is, well, interesting
159 GST_FLAG_SET (queue, GST_ELEMENT_DECOUPLED);
161 queue->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
162 gst_pad_set_chain_function (queue->sinkpad, GST_DEBUG_FUNCPTR(gst_queue_chain));
163 gst_element_add_pad (GST_ELEMENT (queue), queue->sinkpad);
164 gst_pad_set_negotiate_function (queue->sinkpad, GST_DEBUG_FUNCPTR(gst_queue_handle_negotiate_sink));
165 gst_pad_set_bufferpool_function (queue->sinkpad, GST_DEBUG_FUNCPTR(gst_queue_get_bufferpool));
167 queue->srcpad = gst_pad_new ("src", GST_PAD_SRC);
168 gst_pad_set_get_function (queue->srcpad, GST_DEBUG_FUNCPTR(gst_queue_get));
169 gst_element_add_pad (GST_ELEMENT (queue), queue->srcpad);
170 gst_pad_set_negotiate_function (queue->srcpad, GST_DEBUG_FUNCPTR(gst_queue_handle_negotiate_src));
173 queue->level_buffers = 0;
174 queue->level_bytes = 0;
175 queue->level_time = 0LL;
176 queue->size_buffers = 100; // 100 buffers
177 queue->size_bytes = 100 * 1024; // 100KB
178 queue->size_time = 1000000000LL; // 1sec
180 queue->emptycond = g_cond_new ();
181 queue->fullcond = g_cond_new ();
182 GST_DEBUG(GST_CAT_THREAD, "initialized queue's emptycond and fullcond\n");
185 static GstBufferPool*
186 gst_queue_get_bufferpool (GstPad *pad)
190 queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
192 return gst_pad_get_bufferpool (queue->srcpad);
195 static GstPadNegotiateReturn
196 gst_queue_handle_negotiate_src (GstPad *pad, GstCaps **caps, gpointer *data)
200 queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
202 return gst_pad_negotiate_proxy (pad, queue->sinkpad, caps);
205 static GstPadNegotiateReturn
206 gst_queue_handle_negotiate_sink (GstPad *pad, GstCaps **caps, gpointer *data)
210 queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
212 return gst_pad_negotiate_proxy (pad, queue->srcpad, caps);
216 gst_queue_handle_event (GstPad *pad)
220 queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
222 GST_DEBUG (GST_CAT_DATAFLOW,"%s received event\n", GST_ELEMENT_NAME (queue));
225 GST_DEBUG (GST_CAT_DATAFLOW,"%s has %d buffers left\n", GST_ELEMENT_NAME (queue),
226 queue->level_buffers);
228 GST_FLAG_SET (pad, GST_PAD_EOS);
230 g_cond_signal (queue->emptycond);
238 gst_queue_cleanup_buffers (gpointer data, const gpointer user_data)
240 GST_DEBUG (GST_CAT_DATAFLOW,"%s cleaning buffer %p\n", (gchar *)user_data, data);
242 gst_buffer_unref (GST_BUFFER (data));
246 gst_queue_flush (GstQueue *queue)
248 g_slist_foreach (queue->queue, gst_queue_cleanup_buffers,
249 (char *) GST_ELEMENT_NAME (queue));
250 g_slist_free (queue->queue);
253 queue->level_buffers = 0;
254 queue->timeval = NULL;
258 gst_queue_chain (GstPad *pad, GstBuffer *buf)
263 g_return_if_fail (pad != NULL);
264 g_return_if_fail (GST_IS_PAD (pad));
265 g_return_if_fail (buf != NULL);
267 queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
268 name = GST_ELEMENT_NAME (queue);
270 /* we have to lock the queue since we span threads */
272 // GST_DEBUG (GST_CAT_DATAFLOW,"trying to get lock on queue \"%s\"\n",name);
275 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLUSH)) {
276 GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "buffer has FLUSH bit set, flushing queue\n");
277 gst_queue_flush (queue);
280 GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "adding buffer %p of size %d\n",buf,GST_BUFFER_SIZE(buf));
282 if (queue->level_buffers >= queue->size_buffers) {
283 // if this is a leaky queue...
285 // if we leak on the upstream side, drop the current buffer
286 if (queue->leaky == GST_QUEUE_LEAK_UPSTREAM) {
287 GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "queue is full, leaking buffer on upstream end\n");
288 gst_buffer_unref(buf);
289 // now we have to clean up and exit right away
293 // otherwise we have to push a buffer off the other end
297 GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "queue is full, leaking buffer on downstream end\n");
298 front = queue->queue;
299 leakbuf = (GstBuffer *)(front->data);
300 queue->level_buffers--;
301 queue->level_bytes -= GST_BUFFER_SIZE(leakbuf);
302 gst_buffer_unref(leakbuf);
303 queue->queue = g_slist_remove_link (queue->queue, front);
304 g_slist_free (front);
308 while (queue->level_buffers >= queue->size_buffers) {
309 // if there's a pending state change for this queue or its manager, switch
310 // back to iterator so bottom half of state change executes
311 if (GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING ||
312 // GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING)
313 GST_STATE_PENDING(GST_SCHED_PARENT(GST_ELEMENT_SCHED(GST_PAD_PARENT(GST_PAD_PEER(queue->sinkpad))))) !=
314 GST_STATE_VOID_PENDING)
316 GST_DEBUG(GST_CAT_DATAFLOW,"interrupted!!\n");
317 if (GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING)
318 GST_DEBUG(GST_CAT_DATAFLOW,"GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING)\n");
319 if (GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING)
320 GST_DEBUG(GST_CAT_DATAFLOW,"GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING\n");
322 cothread_switch(cothread_current_main());
325 GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "waiting for space, level is %d\n", queue->level_buffers);
326 g_cond_signal (queue->emptycond);
327 g_cond_wait (queue->fullcond, GST_OBJECT(queue)->lock);
328 GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "done waiting, level is now %d\n", queue->level_buffers);
332 /* put the buffer on the tail of the list */
333 queue->queue = g_slist_append (queue->queue, buf);
334 queue->level_buffers++;
335 queue->level_bytes += GST_BUFFER_SIZE(buf);
336 // GST_DEBUG (GST_CAT_DATAFLOW, "(%s:%s)+\n",GST_DEBUG_PAD_NAME(pad));
338 /* if we were empty, but aren't any more, signal a condition */
339 if (queue->level_buffers == 1)
341 GST_DEBUG (GST_CAT_DATAFLOW,"%s signalling emptycond\n", name);
342 g_cond_signal (queue->emptycond);
349 gst_queue_get (GstPad *pad)
352 GstBuffer *buf = NULL;
356 g_assert(pad != NULL);
357 g_assert(GST_IS_PAD(pad));
358 g_return_val_if_fail (pad != NULL, NULL);
359 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
361 queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
362 name = GST_ELEMENT_NAME (queue);
364 /* have to lock for thread-safety */
365 GST_DEBUG (GST_CAT_DATAFLOW,"%s try have queue lock\n", name);
367 GST_DEBUG (GST_CAT_DATAFLOW,"%s push %d %ld %p\n", name, queue->level_buffers, pthread_self (), queue->emptycond);
368 GST_DEBUG (GST_CAT_DATAFLOW,"%s have queue lock\n", name);
370 while (!queue->level_buffers) {
371 if (GST_FLAG_IS_SET (queue->sinkpad, GST_PAD_EOS)) {
372 GST_DEBUG (GST_CAT_DATAFLOW, "%s U released lock\n", name);
374 // this return NULL shouldn't hurt anything...
378 // if there's a pending state change for this queue or its manager, switch
379 // back to iterator so bottom half of state change executes
380 if (GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING ||
381 // GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING)
382 GST_STATE_PENDING(GST_SCHED_PARENT(GST_ELEMENT_SCHED(GST_PAD_PARENT(GST_PAD_PEER(queue->srcpad))))) !=
383 GST_STATE_VOID_PENDING)
385 GST_DEBUG(GST_CAT_DATAFLOW,"interrupted!!\n");
386 if (GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING)
387 GST_DEBUG(GST_CAT_DATAFLOW,"GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING)\n");
388 if (GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING)
389 GST_DEBUG(GST_CAT_DATAFLOW,"GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING\n");
391 cothread_switch(cothread_current_main());
394 g_cond_signal (queue->fullcond);
395 g_cond_wait (queue->emptycond, GST_OBJECT(queue)->lock);
398 front = queue->queue;
399 buf = (GstBuffer *)(front->data);
400 GST_DEBUG (GST_CAT_DATAFLOW,"retrieved buffer %p from queue\n",buf);
401 queue->queue = g_slist_remove_link (queue->queue, front);
402 g_slist_free (front);
404 // if (queue->level_buffers < queue->size_buffers)
405 if (queue->level_buffers == queue->size_buffers)
407 GST_DEBUG (GST_CAT_DATAFLOW,"%s signalling fullcond\n", name);
408 g_cond_signal (queue->fullcond);
411 queue->level_buffers--;
412 queue->level_bytes -= GST_BUFFER_SIZE(buf);
413 GST_DEBUG (GST_CAT_DATAFLOW,"(%s:%s)- ",GST_DEBUG_PAD_NAME(pad));
420 static GstElementStateReturn
421 gst_queue_change_state (GstElement *element)
424 GstElementStateReturn ret;
425 g_return_val_if_fail (GST_IS_QUEUE (element), GST_STATE_FAILURE);
427 queue = GST_QUEUE (element);
429 // lock the queue so another thread (not in sync with this thread's state)
430 // can't call this queue's _get (or whatever)
433 /* if going down into NULL state, clear out buffers*/
434 if (GST_STATE_PENDING (element) == GST_STATE_READY) {
435 /* otherwise (READY or higher) we need to open the file */
436 gst_queue_flush (queue);
439 // if we haven't failed already, give the parent class a chance to ;-)
440 if (GST_ELEMENT_CLASS (parent_class)->change_state)
442 gboolean valid_handler = FALSE;
443 guint state_change_id = g_signal_lookup("state_change", G_OBJECT_TYPE(element));
445 // determine whether we need to block the parent (element) class'
446 // STATE_CHANGE signal so we can UNLOCK before returning. we block
447 // it if we could find the state_change signal AND there's a signal
448 // handler attached to it.
450 // note: this assumes that change_state() *only* emits state_change signal.
451 // if element change_state() emits other signals, they need to be blocked
453 if (state_change_id &&
454 g_signal_has_handler_pending(G_OBJECT(element), state_change_id, 0, FALSE))
455 valid_handler = TRUE;
457 g_signal_handler_block(G_OBJECT(element), state_change_id);
459 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element);
462 g_signal_handler_unblock(G_OBJECT(element), state_change_id);
464 // UNLOCK, *then* emit signal (if there's one there)
467 g_signal_emit(G_OBJECT (element), state_change_id, 0, GST_STATE(element));
471 ret = GST_STATE_SUCCESS;
480 gst_queue_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
484 /* it's not null if we got it, but it might not be ours */
485 g_return_if_fail (GST_IS_QUEUE (object));
487 queue = GST_QUEUE (object);
491 queue->leaky = g_value_get_int(value);
494 queue->size_buffers = g_value_get_int(value);
497 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
503 gst_queue_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
507 /* it's not null if we got it, but it might not be ours */
508 g_return_if_fail (GST_IS_QUEUE (object));
510 queue = GST_QUEUE (object);
514 g_value_set_int(value, queue->leaky);
517 g_value_set_int(value, queue->level_buffers);
520 g_value_set_int(value, queue->size_buffers);
523 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);