gstreamer/gst/gstthread.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.
*/
#include <gst/gst.h>
#include <gst/gstthread.h>
#include "config.h"
GstElementDetails gst_thread_details = {
"Threaded container",
"Bin",
"Container that creates/manages a thread",
VERSION,
"Erik Walthinsen <omega@cse.ogi.edu>",
"(C) 1999",
};
/* Thread signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_CREATE_THREAD,
};
static void gst_thread_class_init(GstThreadClass *klass);
static void gst_thread_init(GstThread *thread);
static void gst_thread_set_arg(GtkObject *object,GtkArg *arg,guint id);
static void gst_thread_get_arg(GtkObject *object,GtkArg *arg,guint id);
static GstElementStateReturn gst_thread_change_state(GstElement *element);
static xmlNodePtr gst_thread_save_thyself(GstElement *element,xmlNodePtr parent);
static void gst_thread_prepare(GstThread *thread);
static void gst_thread_signal_thread(GstThread *thread);
static GstBin *parent_class = NULL;
//static guint gst_thread_signals[LAST_SIGNAL] = { 0 };
GtkType
gst_thread_get_type(void) {
static GtkType thread_type = 0;
if (!thread_type) {
static const GtkTypeInfo thread_info = {
"GstThread",
sizeof(GstThread),
sizeof(GstThreadClass),
(GtkClassInitFunc)gst_thread_class_init,
(GtkObjectInitFunc)gst_thread_init,
(GtkArgSetFunc)NULL,
(GtkArgGetFunc)NULL,
(GtkClassInitFunc)NULL,
};
thread_type = gtk_type_unique(gst_bin_get_type(),&thread_info);
}
return thread_type;
}
static void
gst_thread_class_init(GstThreadClass *klass) {
GtkObjectClass *gtkobject_class;
GstObjectClass *gstobject_class;
GstElementClass *gstelement_class;
gtkobject_class = (GtkObjectClass*)klass;
gstobject_class = (GstObjectClass*)klass;
gstelement_class = (GstElementClass*)klass;
parent_class = gtk_type_class(gst_bin_get_type());
gtk_object_add_arg_type("GstThread::create_thread", GTK_TYPE_BOOL,
GTK_ARG_READWRITE, ARG_CREATE_THREAD);
gstelement_class->change_state = gst_thread_change_state;
gstelement_class->save_thyself = gst_thread_save_thyself;
gtkobject_class->set_arg = gst_thread_set_arg;
gtkobject_class->get_arg = gst_thread_get_arg;
}
static void gst_thread_init(GstThread *thread) {
GST_FLAG_SET(thread,GST_THREAD_CREATE);
// thread->entries = NULL;
// thread->numentries = 0;
thread->lock = g_mutex_new();
thread->cond = g_cond_new();
}
static void gst_thread_set_arg(GtkObject *object,GtkArg *arg,guint id) {
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_THREAD(object));
switch(id) {
case ARG_CREATE_THREAD:
if (GTK_VALUE_BOOL(*arg)) {
gst_info("gstthread: turning ON the creation of the thread\n");
GST_FLAG_SET(object,GST_THREAD_CREATE);
gst_info("gstthread: flags are 0x%08x\n",GST_FLAGS(object));
} else {
gst_info("gstthread: turning OFF the creation of the thread\n");
GST_FLAG_UNSET(object,GST_THREAD_CREATE);
gst_info("gstthread: flags are 0x%08x\n",GST_FLAGS(object));
}
break;
default:
break;
}
}
static void gst_thread_get_arg(GtkObject *object,GtkArg *arg,guint id) {
/* it's not null if we got it, but it might not be ours */
g_return_if_fail(GST_IS_THREAD(object));
switch(id) {
case ARG_CREATE_THREAD:
GTK_VALUE_BOOL(*arg) = GST_FLAG_IS_SET(object,GST_THREAD_CREATE);
break;
default:
break;
}
}
/**
* gst_thread_new:
* @name: the name of the thread
*
* Create a new thrad with the given name
*
* Returns; The new thread
*/
GstElement *gst_thread_new(guchar *name) {
GstThread *thread;
thread = gtk_type_new(gst_thread_get_type());
gst_element_set_name(GST_ELEMENT(thread),name);
return GST_ELEMENT(thread);
}
static GstElementStateReturn gst_thread_change_state(GstElement *element) {
GstThread *thread;
gboolean stateset = TRUE;
gint pending;
g_return_val_if_fail(GST_IS_THREAD(element), FALSE);
thread = GST_THREAD(element);
gst_info("gstthread: thread \"%s\" change state %d\n",
gst_element_get_name(GST_ELEMENT(element)), GST_STATE_PENDING(element));
pending = GST_STATE_PENDING(element);
if (GST_ELEMENT_CLASS(parent_class)->change_state)
stateset = GST_ELEMENT_CLASS(parent_class)->change_state(element);
gst_info("gstthread: stateset %d %d\n", stateset, GST_STATE_PENDING(element));
switch (pending) {
case GST_STATE_READY:
if (!stateset) return FALSE;
// we want to prepare our internal state for doing the iterations
gst_info("gstthread: preparing thread \"%s\" for iterations:\n",
gst_element_get_name(GST_ELEMENT(element)));
//gst_thread_prepare(thread);
gst_bin_create_plan(GST_BIN(thread));
// if (thread->numentries == 0)
// return FALSE;
// set the state to idle
GST_FLAG_UNSET(thread,GST_THREAD_STATE_SPINNING);
// create the thread if that's what we're supposed to do
gst_info("gstthread: flags are 0x%08x\n",GST_FLAGS(thread));
if (GST_FLAG_IS_SET(thread,GST_THREAD_CREATE)) {
gst_info("gstthread: starting thread \"%s\"\n",
gst_element_get_name(GST_ELEMENT(element)));
pthread_create(&thread->thread_id,NULL,
gst_thread_main_loop,thread);
} else {
gst_info("gstthread: NOT starting thread \"%s\"\n",
gst_element_get_name(GST_ELEMENT(element)));
}
return GST_STATE_SUCCESS;
break;
case GST_STATE_PLAYING:
if (!stateset) return FALSE;
gst_info("gstthread: starting thread \"%s\"\n",
gst_element_get_name(GST_ELEMENT(element)));
GST_FLAG_SET(thread,GST_THREAD_STATE_SPINNING);
gst_thread_signal_thread(thread);
break;
case GST_STATE_PAUSED:
gst_info("gstthread: pausing thread \"%s\"\n",
gst_element_get_name(GST_ELEMENT(element)));
GST_FLAG_UNSET(thread,GST_THREAD_STATE_SPINNING);
gst_thread_signal_thread(thread);
break;
case GST_STATE_NULL:
gst_info("gstthread: stopping thread \"%s\"\n",
gst_element_get_name(GST_ELEMENT(element)));
GST_FLAG_SET(thread,GST_THREAD_STATE_REAPING);
gst_thread_signal_thread(thread);
break;
default:
break;
}
return stateset;
}
/**
* gst_thread_main_loop:
* @arg: the thread to start
*
* The main loop of the thread. The thread will iterate
* while the state is GST_THREAD_STATE_SPINNING
*/
void *gst_thread_main_loop(void *arg) {
GstThread *thread = GST_THREAD(arg);
gst_info("gstthread: thread \"%s\" is running with PID %d\n",
gst_element_get_name(GST_ELEMENT(thread)), getpid());
while(!GST_FLAG_IS_SET(thread,GST_THREAD_STATE_REAPING)) {
if (GST_FLAG_IS_SET(thread,GST_THREAD_STATE_SPINNING))
gst_bin_iterate(GST_BIN(thread));
else {
g_mutex_lock(thread->lock);
g_cond_wait(thread->cond,thread->lock);
g_mutex_unlock(thread->lock);
}
}
GST_FLAG_UNSET(thread,GST_THREAD_STATE_REAPING);
pthread_join(thread->thread_id,0);
gst_info("gstthread: thread \"%s\" is stopped\n",
gst_element_get_name(GST_ELEMENT(thread)));
return NULL;
}
static void gst_thread_signal_thread(GstThread *thread) {
g_mutex_lock(thread->lock);
g_cond_signal(thread->cond);
g_mutex_unlock(thread->lock);
}
static xmlNodePtr gst_thread_save_thyself(GstElement *element,xmlNodePtr parent) {
xmlNewChild(parent,NULL,"type","thread");
if (GST_ELEMENT_CLASS(parent_class)->save_thyself)
GST_ELEMENT_CLASS(parent_class)->save_thyself(element,parent);
return NULL;
}