internal void PlayIntoBuffer(short[] buffer)
{
lock (locker)
{
for (int i = 0; i < buffer.Length; i += 2)
{
if (isPlaying)
{
if (rampSampleCounter > 0)
{
speed += rampSlope * 2;
rampSampleCounter -= 2;
if (rampSampleCounter <= 0)
{
speed = destinationSpeed;
}
}
int intPos = (int)position;
int intPosL = intPos & ~0x1;
int intPosR = intPos | 0x1;
var ratio = position - intPosL; //in range 0-2 because of interleaved samples
//left channel
var samp1L = wavFile.ReadSample(intPosL);
var samp2L = wavFile.ReadSample(intPosL + 2);
var interpolatedSampleL = samp1L * (2 - ratio) + samp2L * ratio;
buffer[i] += Clamp(interpolatedSampleL * volume * speed);
//right channel
var samp1R = wavFile.ReadSample(intPosR);
var samp2R = wavFile.ReadSample(intPosR + 2);
var interpolatedSampleR = samp1R * (2 - ratio) + samp2R * ratio;
buffer[i + 1] += Clamp(interpolatedSampleR * volume * speed);
position += speed * 2;
if (speed == 0.0f)
{
isPlaying = false;
}
if (position > LastSafePosition())
{
position = autoRewind ? 0 : LastSafePosition();
if (!isLooped)
{
isPlaying = false;
}
}
}
}
}
}
