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(0,A, gst_element_get_name(GST_ELEMENT(queue)))
34 #include "gst_private.h"
38 GstElementDetails gst_queue_details = {
43 "Erik Walthinsen <omega@cse.ogi.edu>",
48 /* Queue signals and args */
62 static void gst_queue_class_init (GstQueueClass *klass);
63 static void gst_queue_init (GstQueue *queue);
65 static void gst_queue_set_arg (GtkObject *object, GtkArg *arg, guint id);
66 static void gst_queue_get_arg (GtkObject *object, GtkArg *arg, guint id);
68 static gboolean gst_queue_handle_eos (GstPad *pad);
69 static GstPadNegotiateReturn gst_queue_handle_negotiate_src (GstPad *pad, GstCaps **caps, gpointer *data);
70 static GstPadNegotiateReturn gst_queue_handle_negotiate_sink (GstPad *pad, GstCaps **caps, gpointer *data);
71 static void gst_queue_chain (GstPad *pad, GstBuffer *buf);
72 static GstBuffer * gst_queue_get (GstPad *pad);
73 static GstBufferPool* gst_queue_get_bufferpool (GstPad *pad);
75 static void gst_queue_flush (GstQueue *queue);
77 static GstElementStateReturn gst_queue_change_state (GstElement *element);
80 static GstElementClass *parent_class = NULL;
81 //static guint gst_queue_signals[LAST_SIGNAL] = { 0 };
84 gst_queue_get_type(void) {
85 static GtkType queue_type = 0;
88 static const GtkTypeInfo queue_info = {
91 sizeof(GstQueueClass),
92 (GtkClassInitFunc)gst_queue_class_init,
93 (GtkObjectInitFunc)gst_queue_init,
94 (GtkArgSetFunc)gst_queue_set_arg,
95 (GtkArgGetFunc)gst_queue_get_arg,
96 (GtkClassInitFunc)NULL,
98 queue_type = gtk_type_unique (GST_TYPE_ELEMENT, &queue_info);
104 gst_queue_class_init (GstQueueClass *klass)
106 GtkObjectClass *gtkobject_class;
107 GstElementClass *gstelement_class;
109 gtkobject_class = (GtkObjectClass*)klass;
110 gstelement_class = (GstElementClass*)klass;
112 parent_class = gtk_type_class (GST_TYPE_ELEMENT);
114 gtk_object_add_arg_type ("GstQueue::level", GTK_TYPE_INT,
115 GTK_ARG_READABLE, ARG_LEVEL);
116 gtk_object_add_arg_type ("GstQueue::max_level", GTK_TYPE_INT,
117 GTK_ARG_READWRITE, ARG_MAX_LEVEL);
118 gtk_object_add_arg_type ("GstQueue::block", GTK_TYPE_BOOL,
119 GTK_ARG_READWRITE, ARG_BLOCK);
121 gtkobject_class->set_arg = gst_queue_set_arg;
122 gtkobject_class->get_arg = gst_queue_get_arg;
124 gstelement_class->change_state = gst_queue_change_state;
128 gst_queue_init (GstQueue *queue)
130 // scheduling on this kind of element is, well, interesting
131 GST_FLAG_SET (queue, GST_ELEMENT_DECOUPLED);
133 queue->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
134 gst_pad_set_chain_function (queue->sinkpad, GST_DEBUG_FUNCPTR(gst_queue_chain));
135 gst_element_add_pad (GST_ELEMENT (queue), queue->sinkpad);
136 gst_pad_set_eos_function (queue->sinkpad, gst_queue_handle_eos);
137 gst_pad_set_negotiate_function (queue->sinkpad, gst_queue_handle_negotiate_sink);
138 gst_pad_set_bufferpool_function (queue->sinkpad, gst_queue_get_bufferpool);
140 queue->srcpad = gst_pad_new ("src", GST_PAD_SRC);
141 gst_pad_set_get_function (queue->srcpad, GST_DEBUG_FUNCPTR(gst_queue_get));
142 gst_element_add_pad (GST_ELEMENT (queue), queue->srcpad);
143 gst_pad_set_negotiate_function (queue->srcpad, gst_queue_handle_negotiate_src);
146 queue->level_buffers = 0;
147 queue->max_buffers = 100;
149 queue->level_bytes = 0;
150 queue->size_buffers = 0;
151 queue->size_bytes = 0;
153 queue->emptycond = g_cond_new ();
154 queue->fullcond = g_cond_new ();
157 static GstBufferPool*
158 gst_queue_get_bufferpool (GstPad *pad)
162 queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
164 return gst_pad_get_bufferpool (queue->srcpad);
167 static GstPadNegotiateReturn
168 gst_queue_handle_negotiate_src (GstPad *pad, GstCaps **caps, gpointer *data)
172 queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
174 return gst_pad_negotiate_proxy (pad, queue->sinkpad, caps);
177 //return GST_PAD_NEGOTIATE_FAIL;
180 static GstPadNegotiateReturn
181 gst_queue_handle_negotiate_sink (GstPad *pad, GstCaps **caps, gpointer *data)
185 queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
190 return GST_PAD_NEGOTIATE_TRY;
194 return gst_pad_negotiate_proxy (pad, queue->srcpad, caps);
198 return GST_PAD_NEGOTIATE_FAIL;
203 gst_queue_handle_eos (GstPad *pad)
207 queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
209 GST_DEBUG (0,"queue: %s received eos\n", GST_ELEMENT_NAME (queue));
212 GST_DEBUG (0,"queue: %s has %d buffers left\n", GST_ELEMENT_NAME (queue),
213 queue->level_buffers);
215 GST_FLAG_SET (pad, GST_PAD_EOS);
217 g_cond_signal (queue->emptycond);
225 gst_queue_cleanup_buffers (gpointer data, const gpointer user_data)
227 GST_DEBUG (0,"queue: %s cleaning buffer %p\n", (gchar *)user_data, data);
229 gst_buffer_unref (GST_BUFFER (data));
233 gst_queue_flush (GstQueue *queue)
235 g_slist_foreach (queue->queue, gst_queue_cleanup_buffers,
236 (char *) GST_ELEMENT_NAME (queue));
237 g_slist_free (queue->queue);
240 queue->level_buffers = 0;
241 queue->timeval = NULL;
245 gst_queue_chain (GstPad *pad, GstBuffer *buf)
248 gboolean tosignal = FALSE;
251 g_return_if_fail (pad != NULL);
252 g_return_if_fail (GST_IS_PAD (pad));
253 g_return_if_fail (buf != NULL);
255 queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
256 name = GST_ELEMENT_NAME (queue);
258 /* we have to lock the queue since we span threads */
260 GST_DEBUG (0,"queue: try have queue lock\n");
262 GST_DEBUG (0,"queue: %s adding buffer %p %ld\n", name, buf, pthread_self ());
263 GST_DEBUG (0,"queue: have queue lock\n");
265 if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLUSH)) {
266 gst_queue_flush (queue);
269 GST_DEBUG (0,"queue: %s: chain %d %p\n", name, queue->level_buffers, buf);
271 while (queue->level_buffers >= queue->max_buffers) {
272 GST_DEBUG (0,"queue: %s waiting %d\n", name, queue->level_buffers);
274 //g_cond_timed_wait (queue->fullcond, queue->fulllock, queue->timeval);
275 //FIXME need to signal other thread in case signals got lost?
276 g_cond_signal (queue->emptycond);
277 g_cond_wait (queue->fullcond, GST_OBJECT(queue)->lock);
279 GST_DEBUG (0,"queue: %s waiting done %d\n", name, queue->level_buffers);
282 /* put the buffer on the tail of the list */
283 queue->queue = g_slist_append (queue->queue, buf);
284 // STATUS("%s: +\n");
285 GST_DEBUG (0,"(%s:%s)+ ",GST_DEBUG_PAD_NAME(pad));
287 /* if we were empty, but aren't any more, signal a condition */
288 tosignal = (queue->level_buffers >= 0);
289 queue->level_buffers++;
291 /* we can unlock now */
292 GST_DEBUG (0,"queue: %s chain %d end signal(%d,%p)\n", name, queue->level_buffers, tosignal, queue->emptycond);
295 // STATUS("%s: >\n");
296 g_cond_signal (queue->emptycond);
297 // STATUS("%s: >>\n");
303 gst_queue_get (GstPad *pad)
306 GstBuffer *buf = NULL;
310 g_return_val_if_fail (pad != NULL, NULL);
311 g_return_val_if_fail (GST_IS_PAD (pad), NULL);
313 queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
314 name = GST_ELEMENT_NAME (queue);
316 /* have to lock for thread-safety */
317 GST_DEBUG (0,"queue: %s try have queue lock\n", name);
319 GST_DEBUG (0,"queue: %s push %d %ld %p\n", name, queue->level_buffers, pthread_self (), queue->emptycond);
320 GST_DEBUG (0,"queue: %s have queue lock\n", name);
322 // we bail if there's nothing there
323 if (!queue->level_buffers && !queue->block) {
328 while (!queue->level_buffers) {
329 STATUS("queue: %s U released lock\n");
330 //g_cond_timed_wait (queue->emptycond, queue->emptylock, queue->timeval);
331 if (GST_FLAG_IS_SET (queue->sinkpad, GST_PAD_EOS)) {
332 gst_pad_set_eos (queue->srcpad);
335 //FIXME need to signal other thread in case signals got lost?
336 g_cond_signal (queue->fullcond);
337 g_cond_wait (queue->emptycond, GST_OBJECT(queue)->lock);
338 // STATUS("queue: %s U- getting lock\n");
341 front = queue->queue;
342 buf = (GstBuffer *)(front->data);
343 GST_DEBUG (0,"retrieved buffer %p from queue\n",buf);
344 queue->queue = g_slist_remove_link (queue->queue, front);
345 g_slist_free (front);
347 queue->level_buffers--;
348 // STATUS("%s: -\n");
349 GST_DEBUG (0,"(%s:%s)- ",GST_DEBUG_PAD_NAME(pad));
351 if (queue->level_buffers < queue->max_buffers) {
352 // STATUS("%s: < \n");
353 g_cond_signal (queue->fullcond);
354 // STATUS("%s: << \n");
358 // GST_DEBUG (0,"queue: %s pushing %d %p \n", name, queue->level_buffers, buf);
359 // gst_pad_push (queue->srcpad, buf);
360 // GST_DEBUG (0,"queue: %s pushing %d done \n", name, queue->level_buffers);
366 static GstElementStateReturn
367 gst_queue_change_state (GstElement *element)
370 g_return_val_if_fail (GST_IS_QUEUE (element), GST_STATE_FAILURE);
372 queue = GST_QUEUE (element);
373 GST_DEBUG (0,"gstqueue: state pending %d\n", GST_STATE_PENDING (element));
375 /* if going down into NULL state, clear out buffers*/
376 if (GST_STATE_PENDING (element) == GST_STATE_READY) {
377 /* otherwise (READY or higher) we need to open the file */
378 gst_queue_flush (queue);
381 /* if we haven't failed already, give the parent class a chance to ;-) */
382 if (GST_ELEMENT_CLASS (parent_class)->change_state)
383 return GST_ELEMENT_CLASS (parent_class)->change_state (element);
385 return GST_STATE_SUCCESS;
390 gst_queue_set_arg (GtkObject *object, GtkArg *arg, guint id)
394 /* it's not null if we got it, but it might not be ours */
395 g_return_if_fail (GST_IS_QUEUE (object));
397 queue = GST_QUEUE (object);
401 queue->max_buffers = GTK_VALUE_INT (*arg);
404 queue->block = GTK_VALUE_BOOL (*arg);
412 gst_queue_get_arg (GtkObject *object, GtkArg *arg, guint id)
416 /* it's not null if we got it, but it might not be ours */
417 g_return_if_fail (GST_IS_QUEUE (object));
419 queue = GST_QUEUE (object);
423 GTK_VALUE_INT (*arg) = queue->level_buffers;
426 GTK_VALUE_INT (*arg) = queue->max_buffers;
429 GTK_VALUE_BOOL (*arg) = queue->block;
432 arg->type = GTK_TYPE_INVALID;