gstreamer/gst/gstthread.c
Erik Walthinsen b6d31c1c72 Megapatch, changes which states are available, how they're used, and how they're set. Also modifies the scheduling s...
Original commit message from CVS:
Megapatch, changes which states are available, how they're used, and how
they're set.  Also modifies the scheduling system, breaking pulled
buffers.  Check mail archives for more details.
2000-07-17 17:14:15 +00:00

366 lines
11 KiB
C

/* 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>
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);
}
#ifdef OLD_STUFF
static void gst_thread_prepare(GstThread *thread) {
GList *elements;
GstElement *element;
GList *pads;
GstPad *pad, *peer;
GstElement *outside;
thread->numentries = 0;
/* first we need to find all the entry points into the thread */
elements = GST_BIN(thread)->children;
while (elements) {
element = GST_ELEMENT(elements->data);
if (GST_IS_SRC(element)) {
gst_info("gstthread: element \"%s\" is a source entry point for the thread\n",
gst_element_get_name(GST_ELEMENT(element)));
thread->entries = g_list_prepend(thread->entries,element);
thread->numentries++;
} else {
/* go through the list of pads to see if there's a Connection */
pads = gst_element_get_pad_list(element);
while (pads) {
pad = GST_PAD(pads->data);
/* we only worry about sink pads */
if (gst_pad_get_direction(pad) == GST_PAD_SINK) {
/* get the pad's peer */
peer = gst_pad_get_peer(pad);
if (!peer) break;
/* get the parent of the peer of the pad */
outside = GST_ELEMENT(gst_pad_get_parent(peer));
if (!outside) break;
/* if it's a connection and it's not ours... */
if (GST_IS_CONNECTION(outside) &&
(gst_object_get_parent(GST_OBJECT(outside)) != GST_OBJECT(thread))) {
gst_info("gstthread: element \"%s\" is the external source Connection \
for internal element \"%s\"\n",
gst_element_get_name(GST_ELEMENT(outside)),
gst_element_get_name(GST_ELEMENT(element)));
thread->entries = g_list_prepend(thread->entries,outside);
thread->numentries++;
}
}
pads = g_list_next(pads);
}
}
elements = g_list_next(elements);
}
gst_info("gstthread: have %d entries into thread\n",thread->numentries);
}
#endif
static GstElementStateReturn gst_thread_change_state(GstElement *element) {
GstThread *thread;
gboolean stateset = TRUE;
/*
g_return_val_if_fail(GST_IS_THREAD(element), FALSE);
thread = GST_THREAD(element);
if (GST_ELEMENT_CLASS(parent_class)->change_state)
stateset = GST_ELEMENT_CLASS(parent_class)->change_state(element,state);
switch (state) {
case GST_STATE_READY:
if (!stateset) return FALSE;
// we want to prepare our internal state for doing the iterations
gst_info("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("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 TRUE;
break;
#if OLDSTATE
case ~GST_STATE_RUNNING:
// stop, reap, and join the thread
GST_FLAG_UNSET(thread,GST_THREAD_STATE_SPINNING);
GST_FLAG_SET(thread,GST_THREAD_STATE_REAPING);
gst_thread_signal_thread(thread);
pthread_join(thread->thread_id,0);
// tear down the internal state
gst_info("tearing down thread's iteration state\n");
// FIXME do stuff
break;
#endif
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);
return TRUE;
break;
case ~GST_STATE_PLAYING:
gst_info("gstthread: stopping thread \"%s\"\n",
gst_element_get_name(GST_ELEMENT(element)));
GST_FLAG_UNSET(thread,GST_THREAD_STATE_SPINNING);
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;
}
#ifdef OLD_STUFF
/**
* gst_thread_iterate:
* @thread: the thread to iterate
*
* do one iteration
*/
void gst_thread_iterate(GstThread *thread) {
GList *entries;
GstElement *entry;
g_return_if_fail(thread != NULL);
g_return_if_fail(GST_IS_THREAD(thread));
// g_return_if_fail(GST_FLAG_IS_SET(thread,GST_STATE_RUNNING));
g_return_if_fail(thread->numentries > 0);
entries = thread->entries;
DEBUG("gstthread: %s: thread iterate\n", gst_element_get_name(GST_ELEMENT(thread)));
while (entries) {
entry = GST_ELEMENT(entries->data);
if (GST_IS_SRC(entry))
gst_src_push(GST_SRC(entry));
else if (GST_IS_CONNECTION(entry))
gst_connection_push(GST_CONNECTION(entry));
else
g_assert_not_reached();
entries = g_list_next(entries);
}
DEBUG("gstthread: %s: thread iterate done\n", gst_element_get_name(GST_ELEMENT(thread)));
//g_print(",");
}
#endif
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;
}