NaiveFlowControl.cxx

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/*
 * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */


#include "NaiveFlowControl.hxx"
#include "Processing.hxx"
#include "OutPort.hxx"
#include "InPort.hxx"
#include "Network.hxx"

namespace CLAM
{

NaiveFlowControl::NaiveFlowControl()
{
}

void NaiveFlowControl::ProcessingAddedToNetwork( Processing & added )
{
        NetworkTopologyChanged();
        std::string processingType = added.GetClassName();

        if ( processingType == "AudioSource" || processingType == "AudioBufferSource" )
        {
                mSources.push_back( &added );
                return;
        }
        if (added.GetNInPorts()==0 && added.GetNOutPorts()==0) //isolated processings
        {
                mSources.push_back( &added);
                return;
        }
        if (added.GetNInPorts()==0 && added.GetNOutPorts()!=0)
        {
                mGenerators.push_back( &added);
                return;
        }
        if ( processingType == "AudioSink" || processingType == "AudioBufferSink" )
        {
                mSinks.push_back( &added );
                return;
        }
        mNormalProcessings.push_back ( &added );
}

void NaiveFlowControl::ProcessingRemovedFromNetwork( Processing & removed )
{
        NetworkTopologyChanged();
        std::string processingType = removed.GetClassName();
        if ( processingType == "AudioSource" || processingType == "AudioBufferSource" )
        {
                mSources.remove( &removed );
                return;
        }
        if (removed.GetNInPorts()==0 && removed.GetNOutPorts()==0) //isolated processings
        {
                mSources.remove( &removed );
                return;
        }
        if (removed.GetNInPorts()==0 && removed.GetNOutPorts()!=0)
        {
                mGenerators.remove( &removed);
                return;
        }
        if ( processingType == "AudioSink" || processingType == "AudioBufferSink" )
        {
                mSinks.remove( &removed );
                return;
        }
        mNormalProcessings.remove ( &removed );
}

void NaiveFlowControl::Do()
{
        // by now it have nothing of pulling
        // a naive approach: do sources, do normal processings, do sinks
        ProcessingList pendingSinks(mSinks);
        for (ProcessingList::iterator it=mSources.begin(); it!=mSources.end(); it++ )
        {
                Processing* proc = *it;
                if (proc->CanConsumeAndProduce())
                {
                        //std::cerr << "Do: "<<proc->GetClassName() << std::endl;
                        proc->Do();
                }
                else 
                {
                        std::cerr << "Warning: some AudioSource was not able to consume incoming audio from the call-back.";
                }
        }
        while (true)
        {
                bool noProcessingRun = true;
                for (ProcessingList::iterator it=mNormalProcessings.begin(); it!=mNormalProcessings.end(); it++)
                {
                        Processing* proc = *it;
                        if (!proc->CanConsumeAndProduce() )
                        {
                                //std::cerr << "could NOT Do: "<<proc->GetClassName() << std::endl;
                                continue;
                        }
                        //std::cerr << "Do: "<<proc->GetClassName() << std::endl;
                        noProcessingRun = false;
                        proc->Do();
                }
                for (ProcessingList::iterator it=pendingSinks.begin(); it!=pendingSinks.end(); )
                {
                        Processing* proc = *it;
                        if (!proc->CanConsumeAndProduce())
                        {
                                it++;
                                continue;
                        }
                        //std::cerr << "Do: "<<proc->GetClassName() << std::endl;
                        proc->Do();
                        it = pendingSinks.erase(it);
                        noProcessingRun = false;
                }
                if (noProcessingRun && !pendingSinks.empty())
                {
                        for (ProcessingList::iterator it=mGenerators.begin(); it!=mGenerators.end(); it++)
                        {
                                Processing* proc = *it;
                                if (!proc->CanConsumeAndProduce() )
                                {
                                        // std::cerr << "could NOT Do: "<<proc->GetClassName() << std::endl;
                                        continue;
                                }
                                //std::cerr << "Do: "<<proc->GetClassName() << std::endl;
                                noProcessingRun = false;
                                proc->Do();
                        }
                }
                if (noProcessingRun) break;
        }
        if (!pendingSinks.empty())
                std::cerr << "Warning: " << pendingSinks.size() << " sinks were not fed, so could not send audio to the callback." << std::endl;

        //std::cerr << "<<< Network.Do() is Done" << std::endl;

}


} // namespace CLAM