AudioPlayer.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 "AudioPlayer.hxx"

#include "Audio.hxx"
#include "AudioIO.hxx"
#include "AudioOut.hxx"
#include "AudioManager.hxx"

#include "DataTypes.hxx"

#include "Err.hxx"

using namespace CLAM;

AudioPlayer* AudioPlayer::sCurrentPlayer = NULL;

AudioPlayer::AudioPlayer( Audio* audio, SigSlot::Slotv0& slot, TTime t0 ) 
        : mAudioReference( audio ), mT0( t0 )
{
        mCancel = false;
        sCurrentPlayer = this;

        mRequestStop.Connect( slot );

        pthread_create( &mThread, 0, sPlayingThreadSafe, this );
}

AudioPlayer::~AudioPlayer(  ) 
{
        mCancel = true ;
        pthread_join( mThread, 0 );
        delete mAudioReference;
}

void AudioPlayer::PlayingThreadSafe(  )
{
        TSize bufferSize=512;
        AudioManager audioManager( (int)mAudioReference->GetSampleRate(), 4096 );
        
        AudioIOConfig mOutCfgL;
        AudioIOConfig mOutCfgR;
        AudioOut mOutputL;
        AudioOut mOutputR;

        mOutCfgL.SetChannelID( 0 );
        mOutCfgR.SetChannelID( 1 );
                
        mOutputL.Configure( mOutCfgL );
        mOutputR.Configure( mOutCfgR );
        
        Audio tmpAudioBuffer;
        tmpAudioBuffer.SetSize(bufferSize);
        TSize dataSize = mAudioReference->GetSize();
        AudioManager::Current().Start();
        
        // first sample calculation
        TIndex firstSample = 
                ((mT0*1000. - mAudioReference->GetBeginTime())/(mAudioReference->GetEndTime()-mAudioReference->GetBeginTime()))*((TTime)mAudioReference->GetSize()-1.);

        CLAM_ASSERT( firstSample >= 0, "Bad sample index!" );
        CLAM_ASSERT( firstSample < mAudioReference->GetSize(), "Bad sample index!" );

        mOutputL.Start();
        mOutputR.Start();
        for( TIndex i=firstSample; i<dataSize && !mCancel; i+=bufferSize )
        {
                mAudioReference->GetAudioChunk( i, i + tmpAudioBuffer.GetSize(), tmpAudioBuffer, false );
                mOutputR.Do( tmpAudioBuffer );
                mOutputL.Do( tmpAudioBuffer );
        }

        if( !mCancel ) // True if we finished to play all the Audio
                mRequestStop.Emit(  );
}

void* AudioPlayer::sPlayingThreadSafe(void* ptr)
{
        ((AudioPlayer*)ptr)->PlayingThreadSafe();

        return NULL;
}

void AudioPlayer::StopFromGUIThread(  )
{
        if( sCurrentPlayer )
        {
                delete sCurrentPlayer;
                sCurrentPlayer = NULL;
        }
}