gstreamer/plugins/elements/gstqueue.c

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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstqueue.c:
*
* 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) GST_DEBUG(0,A, gst_element_get_name(GST_ELEMENT(queue)))
#else
#define STATUS(A)
#endif
#include <pthread.h>
#include "config.h"
#include "gst_private.h"
#include "gstqueue.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 gboolean gst_queue_handle_eos (GstPad *pad);
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 GstElementClass *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_ELEMENT, &queue_info);
}
return queue_type;
}
static void
gst_queue_class_init (GstQueueClass *klass)
{
GtkObjectClass *gtkobject_class;
GstElementClass *gstelement_class;
gtkobject_class = (GtkObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = gtk_type_class (GST_TYPE_ELEMENT);
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);
gst_pad_set_eos_function (queue->sinkpad, gst_queue_handle_eos);
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->emptycond = g_cond_new ();
queue->fullcond = g_cond_new ();
}
static gboolean
gst_queue_handle_eos (GstPad *pad)
{
GstQueue *queue;
queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
GST_DEBUG (0,"queue: %s received eos\n", GST_ELEMENT_NAME (queue));
GST_LOCK (queue);
GST_DEBUG (0,"queue: %s has %d buffers left\n", GST_ELEMENT_NAME (queue),
queue->level_buffers);
GST_FLAG_SET (pad, GST_PAD_EOS);
g_cond_signal (queue->emptycond);
GST_UNLOCK (queue);
return TRUE;
}
static void
gst_queue_cleanup_buffers (gpointer data, const gpointer user_data)
{
GST_DEBUG (0,"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_NAME (queue));
g_slist_free (queue->queue);
queue->queue = NULL;
queue->level_buffers = 0;
queue->timeval = NULL;
}
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 (GST_OBJECT_PARENT (pad));
name = GST_ELEMENT_NAME (queue);
/* we have to lock the queue since we span threads */
GST_DEBUG (0,"queue: try have queue lock\n");
GST_LOCK (queue);
GST_DEBUG (0,"queue: %s adding buffer %p %ld\n", name, buf, pthread_self ());
GST_DEBUG (0,"queue: have queue lock\n");
if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLUSH)) {
gst_queue_flush (queue);
}
GST_DEBUG (0,"queue: %s: chain %d %p\n", name, queue->level_buffers, buf);
while (queue->level_buffers >= queue->max_buffers) {
GST_DEBUG (0,"queue: %s waiting %d\n", name, queue->level_buffers);
STATUS("%s: O\n");
//g_cond_timed_wait (queue->fullcond, queue->fulllock, queue->timeval);
//FIXME need to signal other thread in case signals got lost?
g_cond_signal (queue->emptycond);
g_cond_wait (queue->fullcond, GST_OBJECT(queue)->lock);
STATUS("%s: O+\n");
GST_DEBUG (0,"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");
GST_DEBUG (0,"(%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 */
GST_DEBUG (0,"queue: %s chain %d end signal(%d,%p)\n", name, queue->level_buffers, tosignal, queue->emptycond);
if (tosignal) {
// STATUS("%s: >\n");
g_cond_signal (queue->emptycond);
// STATUS("%s: >>\n");
}
GST_UNLOCK (queue);
}
static GstBuffer *
gst_queue_get (GstPad *pad)
{
GstQueue *queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
GstBuffer *buf = NULL;
GSList *front;
const guchar *name;
name = GST_ELEMENT_NAME (queue);
/* have to lock for thread-safety */
GST_DEBUG (0,"queue: %s try have queue lock\n", name);
GST_LOCK (queue);
GST_DEBUG (0,"queue: %s push %d %ld %p\n", name, queue->level_buffers, pthread_self (), queue->emptycond);
GST_DEBUG (0,"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");
//g_cond_timed_wait (queue->emptycond, queue->emptylock, queue->timeval);
if (GST_FLAG_IS_SET (queue->sinkpad, GST_PAD_EOS)) {
gst_pad_set_eos (queue->srcpad);
return NULL;
}
//FIXME need to signal other thread in case signals got lost?
g_cond_signal (queue->fullcond);
g_cond_wait (queue->emptycond, GST_OBJECT(queue)->lock);
// STATUS("queue: %s U- getting lock\n");
}
front = queue->queue;
buf = (GstBuffer *)(front->data);
GST_DEBUG (0,"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");
GST_DEBUG (0,"(%s:%s)- ",GST_DEBUG_PAD_NAME(pad));
if (queue->level_buffers < queue->max_buffers) {
// STATUS("%s: < \n");
g_cond_signal (queue->fullcond);
// STATUS("%s: << \n");
}
GST_UNLOCK(queue);
// GST_DEBUG (0,"queue: %s pushing %d %p \n", name, queue->level_buffers, buf);
// gst_pad_push (queue->srcpad, buf);
// GST_DEBUG (0,"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);
GST_DEBUG (0,"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;
}
}