AudioMixer.cxx

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/*
 * Copyright (c) 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 "AudioMixer.hxx"
#include "ProcessingFactory.hxx"


namespace CLAM
{

namespace Hidden
{
        static const char * metadata[] = {
                "key", "AudioMixer",
                "category", "Arithmetic Operations",
                "description", "AudioMixer",
                0
        };
        static FactoryRegistrator<ProcessingFactory, AudioMixer> reg = metadata;
}

AudioMixer::AudioMixer()
        : mOutputPort("Output Audio",this)
{
        Configure( mConfig );
}

void AudioMixer::CreatePortsAndControls()
{
        unsigned portSize = BackendBufferSize();
        
        for( int i=0; i<mConfig.GetNumberOfInPorts(); i++ )
        {
                std::stringstream number("");
                number << i;
                AudioInPort * inPort = new AudioInPort( "Input " + number.str(), this );
                inPort->SetSize( portSize );
                inPort->SetHop( portSize );
                mInputPorts.push_back( inPort );
                
                mInputControls.push_back( new FloatInControl("Gain " + number.str(), this) );
        }
        unsigned int inPortsNumber=mConfig.GetNumberOfInPorts();
        CLAM::Array<TControlData> gainsArray;
        bool useConfigGains = mConfig.HasDefaultGains();
        if (useConfigGains)
        {
                gainsArray=mConfig.GetDefaultGains();
                unsigned numberofConfiguredGains=gainsArray.Size();
                gainsArray.Resize(inPortsNumber);
                gainsArray.SetSize(inPortsNumber);
                for (unsigned i=numberofConfiguredGains;i<gainsArray.Size();i++)
                {
                        gainsArray[i]=1;
                }
                mConfig.SetDefaultGains(gainsArray);
        }
        for( unsigned int i=0; i<inPortsNumber; i++ )
        {
                if (useConfigGains) 
                        mInputControls[i]->DoControl(gainsArray[i]);
                else
                        /* Set gain = 1 by default */
                        mInputControls[i]->DoControl(1.);
        }
        
        mOutputPort.SetSize( portSize );
        mOutputPort.SetHop( portSize );
}

void AudioMixer::RemovePortsAndControls()
{
        std::vector< AudioInPort* >::iterator itInPort;
        for(itInPort=mInputPorts.begin(); itInPort!=mInputPorts.end(); itInPort++)
                delete *itInPort;
        mInputPorts.clear();

        std::vector< FloatInControl* >::iterator itInControl;
        for(itInControl=mInputControls.begin(); itInControl!=mInputControls.end(); itInControl++)
                delete *itInControl;
        mInputControls.clear();
                        
        GetInPorts().Clear();
        GetInControls().Clear();
}

bool AudioMixer::ConcreteConfigure(const ProcessingConfig& c)
{
        CopyAsConcreteConfig(mConfig, c);
        RemovePortsAndControls();
        CreatePortsAndControls();
        return true;
}

bool AudioMixer::Do()
{

        unsigned int frameSize = BackendBufferSize(); 
        unsigned int numInPorts = mConfig.GetNumberOfInPorts();

        TData normConstant = (TData)1.0 /TData(numInPorts);
        TData * output = mOutputPort.GetAudio().GetBuffer().GetPtr();
        TData * inputs[numInPorts];
        TControlData controls[numInPorts];
        for (unsigned int i = 0; i<numInPorts; i++)
        {
                inputs[i]=mInputPorts[i]->GetAudio().GetBuffer().GetPtr();
                controls[i]=mInputControls[i]->GetLastValue();
        }

        for (unsigned int sample=0; sample < frameSize; sample++) 
        {
                TData sum=0.0;
                for (unsigned int inPort=0; inPort< numInPorts; inPort++)
                {
                        sum += inputs[inPort][sample] * controls[inPort];
                }
                output[sample] = sum * normConstant;
        }

        // execute consume/produce methods      
        for (unsigned int inPort=0; inPort<numInPorts; inPort++)
                mInputPorts[inPort]->Consume();
        mOutputPort.Produce();
        
        return true;
}

} // namespace CLAM