/// <summary>
/// Sets gain for specified channel.
/// If the gain delta is too large,
/// gain will be smoothed over the
/// length of the audio buffer to
/// prevent crackling.
/// Does nothing if the specified channel does not exist.
/// </summary>
public void SetGainForChannel(float gain, int channel)
{
if (channel >= _indexedChannelGains.Length)
{
return;
}
GATDynamicChannelGain channelGain = _indexedChannelGains[channel];
if (channelGain == null)
{
_indexedChannelGains[channel] = new GATDynamicChannelGain(channel, gain);
channelGains.Add(_indexedChannelGains[channel]);
}
else
{
channelGain.NextGain = gain;
}
_needsUpdate = true;
}
/// <summary>
/// Copy and interpolated gain to an interleaved float[]
/// </summary>
public void SmoothedGainCopyToInterlaced(float[] destinationArray, int destinationOffset, int sourceIndex, int length, GATDynamicChannelGain channelGain)
{
float gain;
float interpolationDelta;
gain = channelGain.PrevGain;
interpolationDelta = channelGain.InterpolationDelta;
sourceIndex = sourceIndex + _offset;
length = sourceIndex + length;
destinationOffset += channelGain.ChannelNumber;
while (sourceIndex < length)
{
destinationArray[destinationOffset] = _parentArray[sourceIndex] * gain;
destinationOffset += GATInfo.NbOfChannels;
gain += interpolationDelta;
sourceIndex++;
}
}
/// <summary>
/// Additive copy and interpolated gain to an interleaved float[] with extra gain parameter
/// </summary>
public void SmoothedGainMixToInterlaced( float[] destinationArray, int destinationOffset, int sourceIndex, int length, GATDynamicChannelGain channelGain, float igain )
{
float gain;
float interpolationDelta;
gain = channelGain.PrevGain;
interpolationDelta = channelGain.InterpolationDelta;
sourceIndex = sourceIndex + _offset;
length = sourceIndex + length;
destinationOffset += channelGain.ChannelNumber;
while( sourceIndex < length )
{
destinationArray[ destinationOffset ] += _parentArray[sourceIndex] * gain * igain;
destinationOffset += GATInfo.NbOfChannels;
gain += interpolationDelta;
sourceIndex++;
}
}
