Audio.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 "Audio.hxx"
#include "CLAM_Math.hxx"

using namespace CLAM;


void Audio::DefaultInit(void)
{
        // Attribute instantiation.
        AddSampleRate();
        AddBeginTime();
        AddBuffer();
        UpdateData();

        // Attribute initialization (Default values).
        SetSampleRate(44100);
        SetBeginTime(0);//By default, audio starts at 0
}

void Audio::SetEndTime(TTime time)
{
        CLAM_WARNING(false, "Audio::SetEndTime is about to be deprecated. Please use Audio::ResizeToEndTime instead");
        ResizeToEndTime(time);
}

void Audio::ResizeToEndTime(TTime time)
{
        const int newsizeRound = Round((time-GetBeginTime())/1000.0*GetSampleRate());
        SetSize(newsizeRound);
}

void Audio::SetSize(int s)
{
        int oldSize=GetSize();
        if (s==oldSize) return;

        CLAM_ASSERT(s>=0,"Audio::SetSize(): Negative size specified");
        if (HasBuffer()) {
                GetBuffer().Resize(s);
                GetBuffer().SetSize(s);
        }
        if(s>oldSize)
                memset(GetBuffer().GetPtr()+oldSize,0,(s-oldSize)*sizeof(TData));
}

void Audio::SetDuration(TTime duration)
{
        CLAM_WARNING(false, "Audio::SetDuration is about to be deprecated. Please use Audio::ResizeToDuration instead");
        ResizeToDuration(GetIndexFromTime(duration));
}

void Audio::ResizeToDuration(TTime duration)
{
        SetSize(GetIndexFromTime(duration));
}

TTime Audio::GetTimeFromIndex(TIndex index) const
{
        return (TTime)((TTime)index / GetSampleRate()*1000.0  );
}

TIndex Audio::GetIndexFromTime(TTime time) const
{
        return Round(time*((TData)GetSampleRate()/1000.0));
}

void Audio::GetAudioChunk(TTime beginTime, TTime endTime,Audio& chunk, bool configureChunk) const
{
        GetAudioChunk(GetIndexFromTime(beginTime),GetIndexFromTime(endTime),chunk, configureChunk);
}

void Audio::GetAudioSlice(TTime beginTime, TTime endTime,Audio& slice, bool configureSlice) const
{
        GetAudioSlice(GetIndexFromTime(beginTime),GetIndexFromTime(endTime),slice, configureSlice);
}



void Audio::GetAudioSlice( TIndex beginIndex, TIndex endIndex, Audio& slice, bool configureChunk ) const
{
        CLAM_ASSERT( beginIndex >=0, "Negative indexes are not allowed for audio slices" );
        CLAM_ASSERT( endIndex <= GetSize(), "Slices are not allowed to surpass audio size" );


        TIndex size=endIndex-beginIndex;

        DataArray tmpArray;
        tmpArray.SetPtr( GetBuffer().GetPtr() + beginIndex );
        tmpArray.SetSize( size );
        slice.SetBuffer( tmpArray );

        if(configureChunk)
        {
                slice.SetBeginTime(GetTimeFromIndex(beginIndex));
                slice.SetSampleRate( GetSampleRate() );
                slice.GetBuffer().SetSize(size);
        }
        CLAM_ASSERT(HasBuffer(),"Audio::GetAudioChunk: Buffer not initialized");
        
}

void Audio::GetAudioChunk(TIndex beginIndex,TIndex endIndex,Audio& chunk, bool configureChunk) const
{
        
        /*Note that begin index is allowed to be less than zero and the end index to be beyond the end*/
        CLAM_ASSERT(endIndex>beginIndex,
                   "Audio::GetAudioChunk: Incorrect index boundaries for audio chunk");
        TSize nBytesToCopy,offset=0;
        
        if(beginIndex>=GetSize()){
                TIndex size=endIndex-beginIndex;
                if(configureChunk) chunk.SetSize(size);
                //make sure that 0's are set in non written part of audio
                memset(chunk.GetBuffer().GetPtr(),0,size*sizeof(TData));
                return;
        }
        
        chunk.SetBeginTime(GetTimeFromIndex(beginIndex));

        if(configureChunk)
        {
                chunk.SetSampleRate( GetSampleRate() );
                TIndex size=endIndex-beginIndex;
                chunk.SetSize(size);
                chunk.SetSampleRate( GetSampleRate() );
                chunk.SetBeginTime( GetTimeFromIndex(beginIndex) );
        }
        
                
        CLAM_ASSERT(HasBuffer(),"Audio::GetAudioChunk: Buffer not initialized");
        
        /*Whenever trying to copy samples before the beginning or after end of 
          actual audio, zeros will be added at the beginning or end of chunk*/

        if(beginIndex<0)
        {
                offset=-beginIndex;
                beginIndex=0;
                //make sure that 0's are set in non written part of audio
                memset(chunk.GetBuffer().GetPtr(),0,offset*sizeof(TData));
        }
        if(endIndex>=GetSize())
        { 
                TSize ending=endIndex-GetSize();
                memset(chunk.GetBuffer().GetPtr()+GetSize()-beginIndex ,0,ending*sizeof(TData));
                endIndex=GetSize();
        }


        nBytesToCopy=(endIndex-beginIndex)*sizeof(TData);
        
        CLAM_ASSERT(
                nBytesToCopy>=0
                && beginIndex>=0
                && int(nBytesToCopy+beginIndex*sizeof(TData))<=GetBuffer().SizeInBytes(),
                "Error");

        memcpy(chunk.GetBuffer().GetPtr()+offset,GetBuffer().GetPtr()+beginIndex,nBytesToCopy);
}

void Audio::SetAudioChunk(TTime beginTime,const Audio& chunk)
{
        SetAudioChunk(GetIndexFromTime(beginTime),chunk);
}

void Audio::SetAudioChunk(TIndex beginIndex,const Audio& chunk)
{
        CLAM_ASSERT(beginIndex<GetSize(),"Audio::SetAudioChunk: Incorrect begin index");
        TSize nBytesToCopy,offset=0;
        TIndex endIndex=beginIndex+chunk.GetSize();
        if(endIndex>GetSize()) endIndex=GetSize();
        if(beginIndex<0){ 
                offset=-beginIndex;
                beginIndex=0;}
        
        CLAM_ASSERT(chunk.HasBuffer()&&HasBuffer(),"Audio::SetAudioChunk: one of the buffers is not initialized") ;
        nBytesToCopy=(endIndex-beginIndex)*sizeof(TData);
        memcpy(GetBuffer().GetPtr()+beginIndex,chunk.GetBuffer().GetPtr()+offset,nBytesToCopy);
}

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