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194 lines
4.8 KiB
194 lines
4.8 KiB
/*
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The mediastreamer library aims at providing modular media processing and I/O
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for linphone, but also for any telephony application.
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Copyright (C) 2001 Simon MORLAT simon.morlat@linphone.org
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "mssync.h"
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#include <errno.h>
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/* TODO:
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-define an uninit function that free the mutex
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*/
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/**
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* function_name:ms_sync_get_bytes_per_tick
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* @sync: A #MSSync object.
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*
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* Returns the number of bytes per tick. This is a usefull information for sources, so
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* that they can know how much data they must deliver each time they are called.
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*
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*/
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/* private */
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void ms_sync_init(MSSync *sync)
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{
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sync->klass=NULL;
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sync->lock=g_mutex_new();
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sync->thread_cond=g_cond_new();
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sync->stop_cond=g_cond_new();
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sync->attached_filters=NULL;
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sync->execution_list=NULL;
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sync->filters=0;
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sync->run=0;
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sync->flags=0;
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sync->samples_per_tick=0;
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sync->ticks=0;
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sync->time=0;
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sync->thread=NULL;
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}
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void ms_sync_class_init(MSSyncClass *klass)
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{
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klass->max_filters=0;
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klass->synchronize=NULL;
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klass->attach=ms_sync_attach_generic;
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klass->detach=ms_sync_detach_generic;
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klass->destroy=NULL;
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}
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/* public*/
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/**
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* ms_sync_attach:
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* @sync: A #MSSync object.
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* @f: A #MSFilter object.
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*
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* Attach a chain of filters to a synchronisation source @sync. Filter @f must be the first filter of the processing chain.
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* In order to be run, each chain of filter must be attached to a synchronisation source, that will be responsible for scheduling
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* the processing. Multiple chains can be attached to a single synchronisation.
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*
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* Returns: 0 if successfull, a negative value reprensenting the errno.h error.
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*/
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int ms_sync_attach(MSSync *sync,MSFilter *f)
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{
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gint err;
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ms_sync_lock(sync);
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err=sync->klass->attach(sync,f);
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ms_sync_update(sync);
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ms_sync_unlock(sync);
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return(err);
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}
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int ms_sync_attach_generic(MSSync *sync,MSFilter *f)
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{
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int i;
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/* //printf("attr: %i\n",f->klass->attributes); */
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g_return_val_if_fail(f->klass->attributes & FILTER_IS_SOURCE,-EINVAL);
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g_return_val_if_fail(sync->attached_filters!=NULL,-EFAULT);
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/* find a free place to attach*/
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for (i=0;i<sync->klass->max_filters;i++)
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{
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if (sync->attached_filters[i]==NULL)
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{
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sync->attached_filters[i]=f;
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sync->filters++;
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ms_trace("Filter succesfully attached to sync.");
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return 0;
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}
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}
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g_warning("No more link on sync !");
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return(-EMLINK);
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}
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/**
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* ms_sync_detach:
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* @sync: A #MSSync object.
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* @f: A #MSFilter object.
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*
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* Dettach a chain of filters to a synchronisation source. Filter @f must be the first filter of the processing chain.
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* The processing chain will no more be executed.
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*
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* Returns: 0 if successfull, a negative value reprensenting the errno.h error.
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*/
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int ms_sync_detach(MSSync *sync,MSFilter *f)
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{
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gint err;
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ms_sync_lock(sync);
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err=sync->klass->detach(sync,f);
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ms_sync_update(sync);
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ms_sync_unlock(sync);
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return(err);
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}
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int ms_sync_detach_generic(MSSync *sync,MSFilter *f)
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{
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int i;
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g_return_val_if_fail(f->klass->attributes & FILTER_IS_SOURCE,-EINVAL);
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g_return_val_if_fail(sync->attached_filters!=NULL,-EFAULT);
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for (i=0;i<sync->filters;i++)
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{
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if (sync->attached_filters[i]==f)
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{
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sync->attached_filters[i]=NULL;
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sync->filters--;
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return 0;
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}
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}
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return(-EMLINK);
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}
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void ms_sync_set_samples_per_tick(MSSync *sync,gint size)
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{
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if (sync->samples_per_tick==0)
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{
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sync->samples_per_tick=size;
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g_cond_signal(sync->thread_cond);
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}
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else sync->samples_per_tick=size;
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}
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/* call the setup func of each filter attached to the graph */
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void ms_sync_setup(MSSync *sync)
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{
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GList *elem=sync->execution_list;
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MSFilter *f;
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while(elem!=NULL){
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f=(MSFilter*)elem->data;
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if (f->klass->setup!=NULL){
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f->klass->setup(f,sync);
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}
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elem=g_list_next(elem);
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}
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}
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/* call the unsetup func of each filter attached to the graph */
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void ms_sync_unsetup(MSSync *sync)
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{
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GList *elem=sync->execution_list;
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MSFilter *f;
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while(elem!=NULL){
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f=(MSFilter*)elem->data;
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if (f->klass->unsetup!=NULL){
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f->klass->unsetup(f,sync);
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}
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elem=g_list_next(elem);
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}
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}
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int ms_sync_uninit(MSSync *sync)
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{
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g_mutex_free(sync->lock);
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g_cond_free(sync->thread_cond);
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g_cond_free(sync->stop_cond);
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}
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