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/*
* Modification History
*
* 2004-July-17 Jason Rohrer
* Created.
*
* 2004-August-12 Jason Rohrer
* Added a constructor that can specify all sound data.
*/
#include "SoundSamples.h"
#include <string.h>
SoundSamples::SoundSamples( unsigned long inSampleCount,
float *inLeftChannel, float *inRightChannel )
: mSampleCount( inSampleCount ),
mLeftChannel( inLeftChannel ),
mRightChannel( inRightChannel ) {
}
SoundSamples::SoundSamples( unsigned long inSampleCount )
: mSampleCount( inSampleCount ),
mLeftChannel( new float[ inSampleCount ] ),
mRightChannel( new float[ inSampleCount ] ) {
// zero out the channels;
for( unsigned long i=0; i<mSampleCount; i++ ) {
mLeftChannel[ i ] = 0;
mRightChannel[ i ] = 0;
}
}
SoundSamples::SoundSamples( SoundSamples *inSamplesToCopy ) {
mSampleCount = inSamplesToCopy->mSampleCount;
mLeftChannel = new float[ mSampleCount ];
mRightChannel = new float[ mSampleCount ];
memcpy( (void *)( mLeftChannel ),
(void *)( inSamplesToCopy->mLeftChannel ),
mSampleCount * sizeof( float ) );
memcpy( (void *)( mRightChannel ),
(void *)( inSamplesToCopy->mRightChannel ),
mSampleCount * sizeof( float ) );
}
SoundSamples::SoundSamples( SoundSamples *inSamplesToCopy,
unsigned long inNumToCopy ) {
mSampleCount = inSamplesToCopy->mSampleCount;
if( inNumToCopy < mSampleCount ) {
mSampleCount = inNumToCopy;
}
mLeftChannel = new float[ mSampleCount ];
mRightChannel = new float[ mSampleCount ];
memcpy( (void *)( mLeftChannel ),
(void *)( inSamplesToCopy->mLeftChannel ),
mSampleCount * sizeof( float ) );
memcpy( (void *)( mRightChannel ),
(void *)( inSamplesToCopy->mRightChannel ),
mSampleCount * sizeof( float ) );
}
SoundSamples::~SoundSamples() {
delete [] mRightChannel;
delete [] mLeftChannel;
}
void SoundSamples::trim( unsigned long inNumSamplesToDrop ) {
unsigned long newSampleCount = mSampleCount - inNumSamplesToDrop;
float *newLeftChannel = new float[ newSampleCount ];
float *newRightChannel = new float[ newSampleCount ];
// copy samples, skipping inNumSamplesToDrop
memcpy( (void *)( newLeftChannel ),
(void *)( &( mLeftChannel[ inNumSamplesToDrop ] ) ),
newSampleCount * sizeof( float ) );
memcpy( (void *)( newRightChannel ),
(void *)( &( mRightChannel[ inNumSamplesToDrop ] ) ),
newSampleCount * sizeof( float ) );
delete [] mLeftChannel;
delete [] mRightChannel;
mSampleCount = newSampleCount;
mLeftChannel = newLeftChannel;
mRightChannel = newRightChannel;
}
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