/* Attempts to start playing the sound samples from
* where it last left off, returns true if playing is successful,
* false otherwise (can only play one at a time) */
public bool Play(ProcessFrequencies pf)
{
PlayMutex.WaitOne();
bool isPlaying = IsPlaying;
if (!isPlaying)
{
IsPlaying = true;
}
PlayMutex.ReleaseMutex();
if (!isPlaying)
{
PlayTask = Task.Run(() => Playing(pf, LastSampleProcessed));
}
return(!isPlaying);
}
/* Plays the loaded media file until it's finished or another thread
* tells us to stop */
private void Playing(ProcessFrequencies process, long totalSamplesProcessed)
{
long currentSamplesProcessed = 0; // Keep track of what samples currently need to be processed
Stopwatch stopWatch = new Stopwatch();
bool isMono = NChannels == NumChannels.Mono;
int processLength = isMono ? BufferSize : BufferSize * 2; //Need to process Left + Right channels for Stereo
stopWatch.Start();
// While music is playing and all samples haven't been played
while (totalSamplesProcessed < SampleData.Count())
{
bool isPlaying;
PlayMutex.WaitOne();
isPlaying = IsPlaying;
PlayMutex.ReleaseMutex();
if (!isPlaying)
{
return;
}
// Sleep for some time as we don't need to continually send data all the time
Task.Delay(100).Wait();
long elapsed = stopWatch.ElapsedMilliseconds;
stopWatch.Restart();
// Check how many samples we need to send based on the time elapsed since we last sent samples
long nextSamplesProcessed = (SampleRate * elapsed) / 1000;
currentSamplesProcessed += nextSamplesProcessed;
// Time Elapsed enough to process an entire buffer
if (totalSamplesProcessed + processLength < SampleData.Count())
{
double[] buffer;
if (isMono)
{
buffer =
FFT.Magnitude(FFT.PerformFFT(
SampleData.Skip((int)totalSamplesProcessed)
.Take(processLength)
.Select(sample => new Complex(sample, 0))
.ToArray()));
// Stereo
}
else
{
Complex[] fftBuff = new Complex[BufferSize];
int idx = 0;
for (int i = (int)totalSamplesProcessed; i < (int)totalSamplesProcessed + processLength; i += 2)
{
fftBuff[idx++] = (SampleData[i] + SampleData[i + 1]) / 2; // Average left and right channels
}
buffer = FFT.Magnitude(FFT.PerformFFT(fftBuff));
}
process(buffer);
currentSamplesProcessed -= processLength;
totalSamplesProcessed += processLength;
// Reached the end
}
else if (currentSamplesProcessed + totalSamplesProcessed >= SampleData.Count())
{
int toTake = SampleData.Count() - (int)totalSamplesProcessed;
double[] buffer;
if (isMono)
{
buffer =
FFT.Magnitude(FFT.PerformFFT(
SampleData.Skip((int)totalSamplesProcessed)
.Take(toTake)
.Select(sample => new Complex(sample, 0))
.Concat(Enumerable.Repeat(new Complex(0, 0), BufferSize - toTake))
.ToArray()));
// Stereo
}
else
{
Complex[] fftBuff = new Complex[BufferSize];
int idx = 0;
for (int i = (int)totalSamplesProcessed; i < (int)totalSamplesProcessed + toTake; i += 2)
{
fftBuff[idx++] = (SampleData[i] + SampleData[i + 1]) / 2; // Average left and right channels
}
// Pad ending with 0s
for (int i = toTake; i < BufferSize; i++)
{
fftBuff[i] = 0;
}
Debug.WriteLine(fftBuff.Length);
buffer = FFT.Magnitude(FFT.PerformFFT(fftBuff));
}
process(buffer);
totalSamplesProcessed = SampleData.Count();
}
}
LastSampleProcessed = totalSamplesProcessed;
}
