public static void MainLoop<U>(
WaveTableTestGeneratorParams<T, W> generatorParams,
Synthesizer.DataOutCallbackMethod<OutputGeneric<T, U, W>> dataCallback,
OutputGeneric<T, U, W> dataCallbackState,
Synthesizer.StopTask stopper)
{
try
{
// Unoptimized - since only one runs at a time this codepath is not perf critical (unlike the
// resampler loops in the synth engine)
int NumTables = generatorParams.data.NumTables;
float[][] ReferenceArray = new float[NumTables][];
for (int i = 0; i < NumTables; i++)
{
ReferenceArray[i] = generatorParams.data.ListOfTables[i].frames;
}
int PlaybackSamplingRate = generatorParams.samplingRate;
if (PlaybackSamplingRate < Constants.MINSAMPLINGRATE)
{
PlaybackSamplingRate = Constants.MINSAMPLINGRATE;
}
if (PlaybackSamplingRate > Constants.MAXSAMPLINGRATE)
{
PlaybackSamplingRate = Constants.MAXSAMPLINGRATE;
}
int FramesPerTable = generatorParams.data.NumFrames;
/* this is the initial index into the wave table */
Synthesizer.Fixed64 WaveformIndex = new Synthesizer.Fixed64();
/* this is the 16.16 bit fixed point number used to increment the index */
/* into the wave table */
Synthesizer.Fixed64 WaveformIncrementor = new Synthesizer.Fixed64(
FramesPerTable * generatorParams.frequency / PlaybackSamplingRate);
/* the number of times each wave slice has to be used */
int NumberOfIterationsAttack = (int)(generatorParams.attack * PlaybackSamplingRate);
int NumberOfIterationsDecay = (int)(generatorParams.decay * PlaybackSamplingRate);
const int SOUNDBUFFERLENGTHFRAMES = 256;
float[] OutputBuffer = new float[SOUNDBUFFERLENGTHFRAMES * 2];
int OutputIndex = 0;
for (int i = 0; i < NumberOfIterationsAttack + NumberOfIterationsDecay; i++)
{
/* compute wave table index for attack/decay phase */
double TableIndex;
if (i < NumberOfIterationsAttack)
{
TableIndex = (double)i / NumberOfIterationsAttack;
}
else
{
TableIndex = (double)(NumberOfIterationsDecay + NumberOfIterationsAttack - i) / NumberOfIterationsDecay;
}
float Value = Synthesizer.WaveTableIndexer(
WaveformIndex.Double,
TableIndex * (NumTables - 1),
NumTables,
FramesPerTable,
ReferenceArray,
true/*EnableCrossWaveTableInterpolation*/);
WaveformIndex += WaveformIncrementor;
OutputBuffer[2 * OutputIndex + 0] = OutputBuffer[2 * OutputIndex + 1] = Value * .5f;
OutputIndex++;
if (OutputIndex == SOUNDBUFFERLENGTHFRAMES)
{
dataCallback(
dataCallbackState,
OutputBuffer,
0,
SOUNDBUFFERLENGTHFRAMES);
OutputIndex = 0;
if (stopper.Stopped)
{
return;
}
}
}
dataCallback(
dataCallbackState,
OutputBuffer,
0,
OutputIndex);
}
catch (Exception exception)
{
generatorParams.exception = exception;
stopper.Stop();
}
}
