private byte[] GetMP3Bytes()
{
List <byte> resampledBytesList = new List <byte>();
var waveProvider = GetMP3WaveProvider();
Logger.Info($"Convert to Mono 16bit PCM 16000KHz from {waveProvider.WaveFormat}");
//loop thorough in up to 1 second chunks
var resample = new EventDrivenResampler(waveProvider.WaveFormat, new WaveFormat(INPUT_SAMPLE_RATE, 1));
byte[] buffer = new byte[waveProvider.WaveFormat.AverageBytesPerSecond * 2];
int read = 0;
while ((read = waveProvider.Read(buffer, 0, waveProvider.WaveFormat.AverageBytesPerSecond)) > 0)
{
//resample as we go
resampledBytesList.AddRange(resample.ResampleBytes(buffer, read));
}
Logger.Info($"Converted to Mono 16bit PCM 16000KHz from {waveProvider.WaveFormat}");
return(resampledBytesList.ToArray());
}
public void StopEncoding()
{
lock (lockob)
{
_wasapiCapture?.StopRecording();
_wasapiCapture?.Dispose();
_wasapiCapture = null;
_resampler?.Dispose(true);
_resampler = null;
_waveOut?.Dispose();
_waveOut = null;
_playBuffer?.ClearBuffer();
_playBuffer = null;
_encoder?.Dispose();
_encoder = null;
_decoder?.Dispose();
_decoder = null;
_playBuffer?.ClearBuffer();
_playBuffer = null;
_speex?.Dispose();
_speex = null;
_waveFile?.Flush();
_waveFile?.Dispose();
_waveFile = null;
SpeakerMax = -100;
MicMax = -100;
}
}
//Stopwatch _stopwatch = new Stopwatch();
private void WasapiCaptureOnDataAvailable(object sender, WaveInEventArgs e)
{
if (_resampler == null)
{
_resampler = new EventDrivenResampler(windowsN, _wasapiCapture.WaveFormat, new WaveFormat(AudioManager.INPUT_SAMPLE_RATE, 16, 1));
}
if (e.BytesRecorded > 0)
{
//Logger.Info($"Time: {_stopwatch.ElapsedMilliseconds} - Bytes: {e.BytesRecorded}");
short[] resampledPCM16Bit = _resampler.Resample(e.Buffer, e.BytesRecorded);
// Logger.Info($"Time: {_stopwatch.ElapsedMilliseconds} - Bytes: {resampledPCM16Bit.Length}");
//fill sound buffer
short[] pcmShort = null;
for (var i = 0; i < resampledPCM16Bit.Length; i++)
{
_micInputQueue.Enqueue(resampledPCM16Bit[i]);
}
//read out the queue
while ((pcmShort != null) || (_micInputQueue.Count >= AudioManager.SEGMENT_FRAMES))
{
//null sound buffer so read from the queue
if (pcmShort == null)
{
pcmShort = new short[AudioManager.SEGMENT_FRAMES];
for (var i = 0; i < AudioManager.SEGMENT_FRAMES; i++)
{
pcmShort[i] = _micInputQueue.Dequeue();
}
}
try
{
//process with Speex
_speex.Process(new ArraySegment <short>(pcmShort));
float max = 0;
for (var i = 0; i < pcmShort.Length; i++)
{
//determine peak
if (pcmShort[i] > max)
{
max = pcmShort[i];
}
}
//convert to dB
MicMax = (float)VolumeConversionHelper.ConvertFloatToDB(max / 32768F);
var pcmBytes = new byte[pcmShort.Length * 2];
Buffer.BlockCopy(pcmShort, 0, pcmBytes, 0, pcmBytes.Length);
// _buffBufferedWaveProvider.AddSamples(pcmBytes, 0, pcmBytes.Length);
//encode as opus bytes
int len;
//need to get framing right for opus -
var buff = _encoder.Encode(pcmBytes, pcmBytes.Length, out len);
if ((buff != null) && (len > 0))
{
//create copy with small buffer
var encoded = new byte[len];
Buffer.BlockCopy(buff, 0, encoded, 0, len);
var decodedLength = 0;
//now decode
var decodedBytes = _decoder.Decode(encoded, len, out decodedLength);
_buffBufferedWaveProvider.AddSamples(decodedBytes, 0, decodedLength);
// Logger.Info($"Time: {_stopwatch.ElapsedMilliseconds} - Added samples");
}
else
{
Logger.Error(
$"Invalid Bytes for Encoding - {e.BytesRecorded} should be {AudioManager.SEGMENT_FRAMES} ");
}
}
catch (Exception ex)
{
Logger.Error(ex, "Error encoding Opus! " + ex.Message);
}
pcmShort = null;
}
}
// _stopwatch.Restart();
}
