double Sample::update()
{
if(!(soundStatus & PLAYING)) return 0;
if(soundStatus & PAUSED) return 0;
if(!getIsLoaded()) return 0;
long length=getLength();
double remainder;
short* buffer = (short *)myData;
position=(position+speed);
remainder = position - (long) position;
// check if reached EOF
if ((long) position>length) {
if(getIsLooping()) {
position=0;
}
else {
soundStatus &= ~PLAYING;
return 0;
}
}
//check if position less than zero (reverse)
if ((long) position < 0) {
if(getIsLooping()) {
position = length;
}
else {
soundStatus &= ~PLAYING;
return 0;
}
}
output = (double) ((1.0-remainder) * buffer[1+ (long) position] + remainder * buffer[2+(long) position])/32767.0;//linear interpolation
return(output);
}
void Sample::generateWaveForm(vector<MiniMaxima> * _waveForm)
{
_waveForm->clear();
bool loopState = getIsLooping();
setLooping(false);
bool playState = getIsPlaying();
double tmpSpeed = getSpeed();
setSpeed(1.0f);
play();
// waveform display method based on this discussion http://answers.google.com/answers/threadview/id/66003.html
double sampleL, sampleR;
while ((long)position<getLength()) {
MiniMaxima mm;
mm.minL = mm.minR = mm.maxL = mm.maxR = 0;
for (int i = 0; i < 256; i++){
if(myChannels == 1) {
sampleL = update();
sampleR = sampleL;
}
else {
sampleL = update()*0.5;
sampleR = update()*0.5;
}
mm.minL = MIN(mm.minL, sampleL);
mm.minR = MIN(mm.minR, sampleR);
mm.maxL = MAX(mm.maxL, sampleL);
mm.maxR = MAX(mm.maxR, sampleR);
}
_waveForm->push_back(mm);
//cout << mm.minR << " :: " << mm.maxR << " :: " << mm.minL << " :: " << mm.maxL << endl;
}
position = 0;
setLooping(loopState);
setSpeed(tmpSpeed);
if(playState) play();
}
void SoundInstance::update()
{
if (mMotionProvider) {
mMotionProvider->update(*mSource);
}
if (mBinding) {
mBinding->update();
}
if (!getIsLooping()) {
if (mPreviousState == AL_PLAYING) {
ALint alNewState;
alGetSourcei(mSource->getALSource(), AL_SOURCE_STATE, &alNewState);
SoundGeneral::checkAlError("Checking source state.");
if (alNewState == AL_STOPPED) {
EventPlayComplete.emit();
mPreviousState = alNewState;
}
}
}
}
