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/*
The mediastreamer library aims at providing modular media processing and I/O
for linphone, but also for any telephony application.
Copyright (C) 2001 Simon MORLAT simon.morlat@linphone.org
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307 USA
*/
#include "mssync.h"
#include <errno.h>
/* TODO:
-define an uninit function that free the mutex
*/
/**
* function_name:ms_sync_get_bytes_per_tick
* @sync: A #MSSync object.
*
* Returns the number of bytes per tick. This is a usefull information for sources, so
* that they can know how much data they must deliver each time they are called.
*
*/
/* private */
void ms_sync_init(MSSync *sync)
{
sync->klass=NULL;
sync->lock=g_mutex_new();
sync->thread_cond=g_cond_new();
sync->stop_cond=g_cond_new();
sync->attached_filters=NULL;
sync->execution_list=NULL;
sync->filters=0;
sync->run=0;
sync->flags=0;
sync->samples_per_tick=0;
sync->ticks=0;
sync->time=0;
sync->thread=NULL;
}
void ms_sync_class_init(MSSyncClass *klass)
{
klass->max_filters=0;
klass->synchronize=NULL;
klass->attach=ms_sync_attach_generic;
klass->detach=ms_sync_detach_generic;
klass->destroy=NULL;
}
/* public*/
/**
* ms_sync_attach:
* @sync: A #MSSync object.
* @f: A #MSFilter object.
*
* Attach a chain of filters to a synchronisation source @sync. Filter @f must be the first filter of the processing chain.
* In order to be run, each chain of filter must be attached to a synchronisation source, that will be responsible for scheduling
* the processing. Multiple chains can be attached to a single synchronisation.
*
* Returns: 0 if successfull, a negative value reprensenting the errno.h error.
*/
int ms_sync_attach(MSSync *sync,MSFilter *f)
{
gint err;
ms_sync_lock(sync);
err=sync->klass->attach(sync,f);
ms_sync_update(sync);
ms_sync_unlock(sync);
return(err);
}
int ms_sync_attach_generic(MSSync *sync,MSFilter *f)
{
int i;
/* //printf("attr: %i\n",f->klass->attributes); */
g_return_val_if_fail(f->klass->attributes & FILTER_IS_SOURCE,-EINVAL);
g_return_val_if_fail(sync->attached_filters!=NULL,-EFAULT);
/* find a free place to attach*/
for (i=0;i<sync->klass->max_filters;i++)
{
if (sync->attached_filters[i]==NULL)
{
sync->attached_filters[i]=f;
sync->filters++;
ms_trace("Filter succesfully attached to sync.");
return 0;
}
}
g_warning("No more link on sync !");
return(-EMLINK);
}
/**
* ms_sync_detach:
* @sync: A #MSSync object.
* @f: A #MSFilter object.
*
* Dettach a chain of filters to a synchronisation source. Filter @f must be the first filter of the processing chain.
* The processing chain will no more be executed.
*
* Returns: 0 if successfull, a negative value reprensenting the errno.h error.
*/
int ms_sync_detach(MSSync *sync,MSFilter *f)
{
gint err;
ms_sync_lock(sync);
err=sync->klass->detach(sync,f);
ms_sync_update(sync);
ms_sync_unlock(sync);
return(err);
}
int ms_sync_detach_generic(MSSync *sync,MSFilter *f)
{
int i;
g_return_val_if_fail(f->klass->attributes & FILTER_IS_SOURCE,-EINVAL);
g_return_val_if_fail(sync->attached_filters!=NULL,-EFAULT);
for (i=0;i<sync->filters;i++)
{
if (sync->attached_filters[i]==f)
{
sync->attached_filters[i]=NULL;
sync->filters--;
return 0;
}
}
return(-EMLINK);
}
void ms_sync_set_samples_per_tick(MSSync *sync,gint size)
{
if (sync->samples_per_tick==0)
{
sync->samples_per_tick=size;
g_cond_signal(sync->thread_cond);
}
else sync->samples_per_tick=size;
}
/* call the setup func of each filter attached to the graph */
void ms_sync_setup(MSSync *sync)
{
GList *elem=sync->execution_list;
MSFilter *f;
while(elem!=NULL){
f=(MSFilter*)elem->data;
if (f->klass->setup!=NULL){
f->klass->setup(f,sync);
}
elem=g_list_next(elem);
}
}
/* call the unsetup func of each filter attached to the graph */
void ms_sync_unsetup(MSSync *sync)
{
GList *elem=sync->execution_list;
MSFilter *f;
while(elem!=NULL){
f=(MSFilter*)elem->data;
if (f->klass->unsetup!=NULL){
f->klass->unsetup(f,sync);
}
elem=g_list_next(elem);
}
}
int ms_sync_uninit(MSSync *sync)
{
g_mutex_free(sync->lock);
g_cond_free(sync->thread_cond);
g_cond_free(sync->stop_cond);
}
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