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(GST_CAT_DATAFLOW, A, GST_ELEMENT_NAME(queue))
#else
#define STATUS(A)
#endif
#include <pthread.h>
#include "config.h"
#include "gst_private.h"
#include "gstqueue.h"
#include "gstscheduler.h"
GstElementDetails gst_queue_details = {
"Queue",
"Connection",
"Simple data queue",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>",
"(C) 1999",
};
/* Queue signals and args */
enum {
LOW_WATERMARK,
HIGH_WATERMARK,
LAST_SIGNAL
};
enum {
ARG_0,
ARG_LEVEL_BUFFERS,
ARG_LEVEL_BYTES,
ARG_LEVEL_TIME,
ARG_SIZE_BUFFERS,
ARG_SIZE_BYTES,
ARG_SIZE_TIME,
ARG_LEAKY,
ARG_LEVEL,
ARG_MAX_LEVEL,
};
static void gst_queue_class_init (GstQueueClass *klass);
static void gst_queue_init (GstQueue *queue);
static void gst_queue_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void gst_queue_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static GstPadNegotiateReturn gst_queue_handle_negotiate_src (GstPad *pad, GstCaps **caps, gpointer *data);
static GstPadNegotiateReturn gst_queue_handle_negotiate_sink (GstPad *pad, GstCaps **caps, gpointer *data);
static void gst_queue_chain (GstPad *pad, GstBuffer *buf);
static GstBuffer * gst_queue_get (GstPad *pad);
static GstBufferPool* gst_queue_get_bufferpool (GstPad *pad);
static void gst_queue_flush (GstQueue *queue);
static GstElementStateReturn gst_queue_change_state (GstElement *element);
static GType
queue_leaky_get_type(void) {
static GType queue_leaky_type = 0;
static GEnumValue queue_leaky[] = {
{ GST_QUEUE_NO_LEAK, "0", "Not Leaky" },
{ GST_QUEUE_LEAK_UPSTREAM, "1", "Leaky on Upstream" },
{ GST_QUEUE_LEAK_DOWNSTREAM, "2", "Leaky on Downstream" },
{ 0, NULL, NULL },
};
if (!queue_leaky_type) {
queue_leaky_type = g_enum_register_static("GstQueueLeaky", queue_leaky);
}
return queue_leaky_type;
}
#define GST_TYPE_QUEUE_LEAKY (queue_leaky_get_type())
static GstElementClass *parent_class = NULL;
//static guint gst_queue_signals[LAST_SIGNAL] = { 0 };
GType
gst_queue_get_type(void) {
static GType queue_type = 0;
if (!queue_type) {
static const GTypeInfo queue_info = {
sizeof(GstQueueClass),
NULL,
NULL,
(GClassInitFunc)gst_queue_class_init,
NULL,
NULL,
sizeof(GstQueue),
4,
(GInstanceInitFunc)gst_queue_init,
};
queue_type = g_type_register_static (GST_TYPE_ELEMENT, "GstQueue", &queue_info, 0);
}
return queue_type;
}
static void
gst_queue_class_init (GstQueueClass *klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_LEAKY,
g_param_spec_enum("leaky","Leaky","Where the queue leaks, if at all.",
GST_TYPE_QUEUE_LEAKY,GST_QUEUE_NO_LEAK,G_PARAM_READWRITE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_LEVEL,
g_param_spec_int("level","Level","How many buffers are in the queue.",
0,G_MAXINT,0,G_PARAM_READABLE));
g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_MAX_LEVEL,
g_param_spec_int("max_level","Maximum Level","How many buffers the queue holds.",
0,G_MAXINT,100,G_PARAM_READWRITE));
gobject_class->set_property = GST_DEBUG_FUNCPTR(gst_queue_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR(gst_queue_get_property);
gstelement_class->change_state = GST_DEBUG_FUNCPTR(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_negotiate_function (queue->sinkpad, GST_DEBUG_FUNCPTR(gst_queue_handle_negotiate_sink));
gst_pad_set_bufferpool_function (queue->sinkpad, GST_DEBUG_FUNCPTR(gst_queue_get_bufferpool));
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);
gst_pad_set_negotiate_function (queue->srcpad, GST_DEBUG_FUNCPTR(gst_queue_handle_negotiate_src));
queue->queue = NULL;
queue->level_buffers = 0;
queue->level_bytes = 0;
queue->level_time = 0LL;
queue->size_buffers = 100; // 100 buffers
queue->size_bytes = 100 * 1024; // 100KB
queue->size_time = 1000000000LL; // 1sec
queue->emptycond = g_cond_new ();
queue->fullcond = g_cond_new ();
GST_DEBUG(GST_CAT_THREAD, "initialized queue's emptycond and fullcond\n");
}
static GstBufferPool*
gst_queue_get_bufferpool (GstPad *pad)
{
GstQueue *queue;
queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
return gst_pad_get_bufferpool (queue->srcpad);
}
static GstPadNegotiateReturn
gst_queue_handle_negotiate_src (GstPad *pad, GstCaps **caps, gpointer *data)
{
GstQueue *queue;
queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
return gst_pad_negotiate_proxy (pad, queue->sinkpad, caps);
}
static GstPadNegotiateReturn
gst_queue_handle_negotiate_sink (GstPad *pad, GstCaps **caps, gpointer *data)
{
GstQueue *queue;
queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
return gst_pad_negotiate_proxy (pad, queue->srcpad, caps);
}
static gboolean
gst_queue_handle_event (GstPad *pad)
{
GstQueue *queue;
queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
GST_DEBUG (GST_CAT_DATAFLOW,"%s received event\n", GST_ELEMENT_NAME (queue));
GST_LOCK (queue);
GST_DEBUG (GST_CAT_DATAFLOW,"%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 (GST_CAT_DATAFLOW,"%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;
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 (GST_CAT_DATAFLOW,"trying to get lock on queue \"%s\"\n",name);
GST_LOCK (queue);
if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLUSH)) {
GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "buffer has FLUSH bit set, flushing queue\n");
gst_queue_flush (queue);
}
GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "adding buffer %p of size %d\n",buf,GST_BUFFER_SIZE(buf));
if (queue->level_buffers >= queue->size_buffers) {
// if this is a leaky queue...
if (queue->leaky) {
// if we leak on the upstream side, drop the current buffer
if (queue->leaky == GST_QUEUE_LEAK_UPSTREAM) {
GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "queue is full, leaking buffer on upstream end\n");
gst_buffer_unref(buf);
// now we have to clean up and exit right away
GST_UNLOCK (queue);
return;
}
// otherwise we have to push a buffer off the other end
else {
GSList *front;
GstBuffer *leakbuf;
GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "queue is full, leaking buffer on downstream end\n");
front = queue->queue;
leakbuf = (GstBuffer *)(front->data);
queue->level_buffers--;
queue->level_bytes -= GST_BUFFER_SIZE(leakbuf);
gst_buffer_unref(leakbuf);
queue->queue = g_slist_remove_link (queue->queue, front);
g_slist_free (front);
}
}
while (queue->level_buffers >= queue->size_buffers) {
// if there's a pending state change for this queue or its manager, switch
// back to iterator so bottom half of state change executes
if (GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING ||
// GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING)
GST_STATE_PENDING(GST_SCHED_PARENT(GST_ELEMENT_SCHED(GST_PAD_PARENT(GST_PAD_PEER(queue->sinkpad))))) !=
GST_STATE_VOID_PENDING)
{
GST_DEBUG(GST_CAT_DATAFLOW,"interrupted!!\n");
if (GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING)
GST_DEBUG(GST_CAT_DATAFLOW,"GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING)\n");
if (GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING)
GST_DEBUG(GST_CAT_DATAFLOW,"GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING\n");
GST_UNLOCK(queue);
cothread_switch(cothread_current_main());
}
GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "waiting for space, level is %d\n", queue->level_buffers);
g_cond_signal (queue->emptycond);
g_cond_wait (queue->fullcond, GST_OBJECT(queue)->lock);
GST_DEBUG_ELEMENT (GST_CAT_DATAFLOW, queue, "done waiting, level is now %d\n", queue->level_buffers);
}
}
/* put the buffer on the tail of the list */
queue->queue = g_slist_append (queue->queue, buf);
queue->level_buffers++;
queue->level_bytes += GST_BUFFER_SIZE(buf);
// GST_DEBUG (GST_CAT_DATAFLOW, "(%s:%s)+\n",GST_DEBUG_PAD_NAME(pad));
/* if we were empty, but aren't any more, signal a condition */
if (queue->level_buffers == 1)
{
GST_DEBUG (GST_CAT_DATAFLOW,"%s signalling emptycond\n", name);
g_cond_signal (queue->emptycond);
}
GST_UNLOCK (queue);
}
static GstBuffer *
gst_queue_get (GstPad *pad)
{
GstQueue *queue;
GstBuffer *buf = NULL;
GSList *front;
const guchar *name;
g_assert(pad != NULL);
g_assert(GST_IS_PAD(pad));
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
name = GST_ELEMENT_NAME (queue);
/* have to lock for thread-safety */
GST_DEBUG (GST_CAT_DATAFLOW,"%s try have queue lock\n", name);
GST_LOCK (queue);
GST_DEBUG (GST_CAT_DATAFLOW,"%s push %d %ld %p\n", name, queue->level_buffers, pthread_self (), queue->emptycond);
GST_DEBUG (GST_CAT_DATAFLOW,"%s have queue lock\n", name);
while (!queue->level_buffers) {
if (GST_FLAG_IS_SET (queue->sinkpad, GST_PAD_EOS)) {
GST_DEBUG (GST_CAT_DATAFLOW, "%s U released lock\n", name);
GST_UNLOCK(queue);
// this return NULL shouldn't hurt anything...
return NULL;
}
// if there's a pending state change for this queue or its manager, switch
// back to iterator so bottom half of state change executes
if (GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING ||
// GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING)
GST_STATE_PENDING(GST_SCHED_PARENT(GST_ELEMENT_SCHED(GST_PAD_PARENT(GST_PAD_PEER(queue->srcpad))))) !=
GST_STATE_VOID_PENDING)
{
GST_DEBUG(GST_CAT_DATAFLOW,"interrupted!!\n");
if (GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING)
GST_DEBUG(GST_CAT_DATAFLOW,"GST_STATE_PENDING(queue) != GST_STATE_VOID_PENDING)\n");
if (GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING)
GST_DEBUG(GST_CAT_DATAFLOW,"GST_STATE_PENDING(GST_SCHEDULE(GST_ELEMENT(queue)->sched)->parent) != GST_STATE_VOID_PENDING\n");
GST_UNLOCK(queue);
cothread_switch(cothread_current_main());
}
g_cond_signal (queue->fullcond);
g_cond_wait (queue->emptycond, GST_OBJECT(queue)->lock);
}
front = queue->queue;
buf = (GstBuffer *)(front->data);
GST_DEBUG (GST_CAT_DATAFLOW,"retrieved buffer %p from queue\n",buf);
queue->queue = g_slist_remove_link (queue->queue, front);
g_slist_free (front);
// if (queue->level_buffers < queue->size_buffers)
if (queue->level_buffers == queue->size_buffers)
{
GST_DEBUG (GST_CAT_DATAFLOW,"%s signalling fullcond\n", name);
g_cond_signal (queue->fullcond);
}
queue->level_buffers--;
queue->level_bytes -= GST_BUFFER_SIZE(buf);
GST_DEBUG (GST_CAT_DATAFLOW,"(%s:%s)- ",GST_DEBUG_PAD_NAME(pad));
GST_UNLOCK(queue);
return buf;
}
static GstElementStateReturn
gst_queue_change_state (GstElement *element)
{
GstQueue *queue;
GstElementStateReturn ret;
g_return_val_if_fail (GST_IS_QUEUE (element), GST_STATE_FAILURE);
queue = GST_QUEUE (element);
// lock the queue so another thread (not in sync with this thread's state)
// can't call this queue's _get (or whatever)
GST_LOCK (queue);
/* 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)
{
gboolean valid_handler = FALSE;
guint state_change_id = g_signal_lookup("state_change", G_OBJECT_TYPE(element));
// determine whether we need to block the parent (element) class'
// STATE_CHANGE signal so we can UNLOCK before returning. we block
// it if we could find the state_change signal AND there's a signal
// handler attached to it.
//
// note: this assumes that change_state() *only* emits state_change signal.
// if element change_state() emits other signals, they need to be blocked
// as well.
if (state_change_id &&
g_signal_has_handler_pending(G_OBJECT(element), state_change_id, 0, FALSE))
valid_handler = TRUE;
if (valid_handler)
g_signal_handler_block(G_OBJECT(element), state_change_id);
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element);
if (valid_handler)
g_signal_handler_unblock(G_OBJECT(element), state_change_id);
// UNLOCK, *then* emit signal (if there's one there)
GST_UNLOCK(queue);
if (valid_handler)
g_signal_emit(G_OBJECT (element), state_change_id, 0, GST_STATE(element));
}
else
{
ret = GST_STATE_SUCCESS;
GST_UNLOCK(queue);
}
return ret;
}
static void
gst_queue_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
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 (prop_id) {
case ARG_LEAKY:
queue->leaky = g_value_get_int(value);
break;
case ARG_MAX_LEVEL:
queue->size_buffers = g_value_get_int(value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_queue_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
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 (prop_id) {
case ARG_LEAKY:
g_value_set_int(value, queue->leaky);
break;
case ARG_LEVEL:
g_value_set_int(value, queue->level_buffers);
break;
case ARG_MAX_LEVEL:
g_value_set_int(value, queue->size_buffers);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}