gstreamer/plugins/elements/gstqueue.c

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/* Gnome-Streamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
//#define DEBUG_ENABLED
//#define STATUS_ENABLED
#ifdef STATUS_ENABLED
#define STATUS(A) DEBUG(A, gst_element_get_name(GST_ELEMENT(queue)))
#else
#define STATUS(A)
#endif
#include <gstqueue.h>
#include <gst/gstarch.h>
GstElementDetails gst_queue_details = {
"Queue",
"Connection",
"Simple data queue",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>",
"(C) 1999",
};
/* Queue signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_LEVEL,
ARG_MAX_LEVEL,
ARG_BLOCK,
};
static void gst_queue_class_init (GstQueueClass *klass);
static void gst_queue_init (GstQueue *queue);
static void gst_queue_set_arg (GtkObject *object, GtkArg *arg, guint id);
static void gst_queue_get_arg (GtkObject *object, GtkArg *arg, guint id);
static void gst_queue_chain (GstPad *pad, GstBuffer *buf);
static GstBuffer * gst_queue_get (GstPad *pad);
static void gst_queue_flush (GstQueue *queue);
static GstElementStateReturn gst_queue_change_state (GstElement *element);
static GstConnectionClass *parent_class = NULL;
//static guint gst_queue_signals[LAST_SIGNAL] = { 0 };
GtkType
gst_queue_get_type(void) {
static GtkType queue_type = 0;
if (!queue_type) {
static const GtkTypeInfo queue_info = {
"GstQueue",
sizeof(GstQueue),
sizeof(GstQueueClass),
(GtkClassInitFunc)gst_queue_class_init,
(GtkObjectInitFunc)gst_queue_init,
(GtkArgSetFunc)gst_queue_set_arg,
(GtkArgGetFunc)gst_queue_get_arg,
(GtkClassInitFunc)NULL,
};
queue_type = gtk_type_unique (GST_TYPE_CONNECTION, &queue_info);
}
return queue_type;
}
static void
gst_queue_class_init (GstQueueClass *klass)
{
GtkObjectClass *gtkobject_class;
GstElementClass *gstelement_class;
GstConnectionClass *gstconnection_class;
gtkobject_class = (GtkObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
gstconnection_class = (GstConnectionClass*)klass;
parent_class = gtk_type_class (GST_TYPE_CONNECTION);
gtk_object_add_arg_type ("GstQueue::level", GTK_TYPE_INT,
GTK_ARG_READABLE, ARG_LEVEL);
gtk_object_add_arg_type ("GstQueue::max_level", GTK_TYPE_INT,
GTK_ARG_READWRITE, ARG_MAX_LEVEL);
gtk_object_add_arg_type ("GstQueue::block", GTK_TYPE_BOOL,
GTK_ARG_READWRITE, ARG_BLOCK);
gtkobject_class->set_arg = gst_queue_set_arg;
gtkobject_class->get_arg = gst_queue_get_arg;
gstelement_class->change_state = gst_queue_change_state;
}
static void
gst_queue_init (GstQueue *queue)
{
// scheduling on this kind of element is, well, interesting
GST_FLAG_SET (queue, GST_ELEMENT_DECOUPLED);
queue->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
gst_pad_set_chain_function (queue->sinkpad, GST_DEBUG_FUNCPTR(gst_queue_chain));
gst_element_add_pad (GST_ELEMENT (queue), queue->sinkpad);
queue->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_pad_set_get_function (queue->srcpad, GST_DEBUG_FUNCPTR(gst_queue_get));
gst_element_add_pad (GST_ELEMENT (queue), queue->srcpad);
queue->queue = NULL;
queue->level_buffers = 0;
queue->max_buffers = 100;
queue->block = TRUE;
queue->level_bytes = 0;
queue->size_buffers = 0;
queue->size_bytes = 0;
queue->emptylock = g_mutex_new ();
queue->emptycond = g_cond_new ();
queue->fulllock = g_mutex_new ();
queue->fullcond = g_cond_new ();
}
static void
gst_queue_cleanup_buffers (gpointer data, const gpointer user_data)
{
DEBUG("queue: %s cleaning buffer %p\n", (gchar *)user_data, data);
gst_buffer_unref (GST_BUFFER (data));
}
static void
gst_queue_flush (GstQueue *queue)
{
g_slist_foreach (queue->queue, gst_queue_cleanup_buffers,
(char *)gst_element_get_name (GST_ELEMENT (queue)));
g_slist_free (queue->queue);
queue->queue = NULL;
queue->level_buffers = 0;
}
static void
gst_queue_chain (GstPad *pad, GstBuffer *buf)
{
GstQueue *queue;
gboolean tosignal = FALSE;
const guchar *name;
g_return_if_fail (pad != NULL);
g_return_if_fail (GST_IS_PAD (pad));
g_return_if_fail (buf != NULL);
queue = GST_QUEUE (pad->parent);
name = gst_element_get_name (GST_ELEMENT (queue));
/* we have to lock the queue since we span threads */
DEBUG("queue: try have queue lock\n");
GST_LOCK (queue);
DEBUG("queue: %s adding buffer %p %ld\n", name, buf, pthread_self ());
DEBUG("queue: have queue lock\n");
if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLUSH)) {
gst_queue_flush (queue);
}
DEBUG("queue: %s: chain %d %p\n", name, queue->level_buffers, buf);
while (queue->level_buffers >= queue->max_buffers) {
DEBUG("queue: %s waiting %d\n", name, queue->level_buffers);
STATUS("%s: O\n");
GST_UNLOCK (queue);
g_mutex_lock (queue->fulllock);
g_cond_wait (queue->fullcond, queue->fulllock);
g_mutex_unlock (queue->fulllock);
GST_LOCK (queue);
STATUS("%s: O+\n");
DEBUG("queue: %s waiting done %d\n", name, queue->level_buffers);
}
/* put the buffer on the tail of the list */
queue->queue = g_slist_append (queue->queue, buf);
// STATUS("%s: +\n");
DEBUG("(%s:%s)+ ",GST_DEBUG_PAD_NAME(pad));
/* if we were empty, but aren't any more, signal a condition */
tosignal = (queue->level_buffers >= 0);
queue->level_buffers++;
/* we can unlock now */
DEBUG("queue: %s chain %d end signal(%d,%p)\n", name, queue->level_buffers, tosignal, queue->emptycond);
GST_UNLOCK (queue);
if (tosignal) {
g_mutex_lock (queue->emptylock);
// STATUS("%s: >\n");
g_cond_signal (queue->emptycond);
// STATUS("%s: >>\n");
g_mutex_unlock (queue->emptylock);
}
}
static GstBuffer *
WARNING: Don't grab this updated unless you're really, REALLY sure. Original commit message from CVS: WARNING: Don't grab this updated unless you're really, REALLY sure. WARNING: Wait for the next one. Whole lotta changes here, including a few random bits: examples/*/Makefile: updated to use `libtool gcc`, not just `gcc` gst/ gstbuffer.h: updated to new flag style gst.c, gstdebug.h: added new debugging for function ptrs gstpipeline.c: set type of parent_class to the class, not the object gstthread.c: ditto plugins/ cdparanoia/cdparanoia.c: added an argument type, updated some defaults cobin/spindentity.c: updated to new do/while loopfunction style mp3encode/lame/gstlame.c: argument types, whole lotta lame options tests/: various changes Now, for the big changes: Once again, the scheduling system has changed. And once again, it broke a whole bunch of things. The gist of the change is that there is now a function pointer for gst_pad_push and gst_pad_pull, instead of a hard-wired function. Well, currently they are functions, but that's for debugging purposes only, they just call the function pointer after spewing lots of DEBUG(). This changed the GstPad structure a bit, and the GstPad API as well. Where elements used to provide chain() and pull() functions, they provide chain() and get() functions. gst_pad_set_pull[region]_function has been changed to get_pad_set_get[region]_function. This means all the elements out there that used to have pull functions need to be updated. The calls to that function have been changed in the normal elements, but the names of the functions passed is still _pull[region](), which is an aesthetic issue more than anything. As for what doesn't work yet, just about anything dealing with Connections is hosed, meaning threaded stuff won't work. This will be fixed about 12 hours from now, after I've slept, etc. The simplefake.c test works in both cothreaded and chained cases, but not much else will work due to the Connection problem. Needless to say, don't grab this unless you *need* these features *now*, else wait to update this stuff until tomorrow. I'm going to sleep now.
2000-12-16 10:18:09 +00:00
gst_queue_get (GstPad *pad)
{
GstQueue *queue = GST_QUEUE (gst_pad_get_parent(pad));
GstBuffer *buf = NULL;
GSList *front;
gboolean tosignal = FALSE;
const guchar *name;
name = gst_element_get_name (GST_ELEMENT (queue));
/* have to lock for thread-safety */
DEBUG("queue: %s try have queue lock\n", name);
GST_LOCK (queue);
DEBUG("queue: %s push %d %ld %p\n", name, queue->level_buffers, pthread_self (), queue->emptycond);
DEBUG("queue: %s have queue lock\n", name);
// we bail if there's nothing there
if (!queue->level_buffers && !queue->block) {
GST_UNLOCK(queue);
return NULL;
}
while (!queue->level_buffers) {
STATUS("queue: %s U released lock\n");
GST_UNLOCK (queue);
g_mutex_lock (queue->emptylock);
g_cond_wait (queue->emptycond, queue->emptylock);
g_mutex_unlock (queue->emptylock);
GST_LOCK (queue);
// STATUS("queue: %s U- getting lock\n");
}
front = queue->queue;
buf = (GstBuffer *)(front->data);
DEBUG("retrieved buffer %p from queue\n",buf);
queue->queue = g_slist_remove_link (queue->queue, front);
g_slist_free (front);
queue->level_buffers--;
// STATUS("%s: -\n");
DEBUG("(%s:%s)- ",GST_DEBUG_PAD_NAME(pad));
tosignal = queue->level_buffers < queue->max_buffers;
GST_UNLOCK(queue);
if (tosignal) {
g_mutex_lock (queue->fulllock);
// STATUS("%s: < \n");
g_cond_signal (queue->fullcond);
// STATUS("%s: << \n");
g_mutex_unlock (queue->fulllock);
}
// DEBUG("queue: %s pushing %d %p \n", name, queue->level_buffers, buf);
// gst_pad_push (queue->srcpad, buf);
// DEBUG("queue: %s pushing %d done \n", name, queue->level_buffers);
return buf;
/* unlock now */
}
static GstElementStateReturn
gst_queue_change_state (GstElement *element)
{
GstQueue *queue;
g_return_val_if_fail (GST_IS_QUEUE (element), GST_STATE_FAILURE);
queue = GST_QUEUE (element);
DEBUG("gstqueue: state pending %d\n", GST_STATE_PENDING (element));
/* if going down into NULL state, clear out buffers*/
if (GST_STATE_PENDING (element) == GST_STATE_READY) {
/* otherwise (READY or higher) we need to open the file */
gst_queue_flush (queue);
}
/* if we haven't failed already, give the parent class a chance to ;-) */
if (GST_ELEMENT_CLASS (parent_class)->change_state)
return GST_ELEMENT_CLASS (parent_class)->change_state (element);
return GST_STATE_SUCCESS;
}
static void
gst_queue_set_arg (GtkObject *object, GtkArg *arg, guint id)
{
GstQueue *queue;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_QUEUE (object));
queue = GST_QUEUE (object);
switch(id) {
case ARG_MAX_LEVEL:
queue->max_buffers = GTK_VALUE_INT (*arg);
break;
case ARG_BLOCK:
queue->block = GTK_VALUE_BOOL (*arg);
break;
default:
break;
}
}
static void
gst_queue_get_arg (GtkObject *object, GtkArg *arg, guint id)
{
GstQueue *queue;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_QUEUE (object));
queue = GST_QUEUE (object);
switch (id) {
case ARG_LEVEL:
GTK_VALUE_INT (*arg) = queue->level_buffers;
break;
case ARG_MAX_LEVEL:
GTK_VALUE_INT (*arg) = queue->max_buffers;
break;
case ARG_BLOCK:
GTK_VALUE_BOOL (*arg) = queue->block;
break;
default:
arg->type = GTK_TYPE_INVALID;
break;
}
}