/**
* FORMAT 3, 4, 5
* OPUS 64kbit/s, 32 kbit/s, 16 kbit/s (mono)
**/
private byte[] EncodeOpus(float[] data)
{
// STORE UP DATA UNTIL WE HAVE ENOUGH TO ENCODE A FRAME
format3data.AddRange(Converters.floats2shorts(data, true));
// CLEAR THE COMPRESSED DATA
format3compdata.Clear();
while (format3data.Count > 960 * 2)
{
// Encoding loop
short[] inputAudioSamples = format3data.GetRange(0, 960 * 2).ToArray();
format3data.RemoveRange(0, 960 * 2);
byte[] outputBuffer = new byte[1000];
int frameSize = 960;
int thisPacketSize = opus_encoder.Encode(inputAudioSamples, 0, frameSize, outputBuffer, 0, outputBuffer.Length); // this throws OpusException on a failure, rather than returning a negative number
byte[] truncArray = new byte[thisPacketSize];
Array.Copy(outputBuffer, truncArray, truncArray.Length);
format3compdata.AddRange(truncArray);
}
if (format3compdata.Count > 0)
{
return(format3compdata.ToArray());
}
return(null);
}
/**
* FORMAT 2
* G722 16kHz mono
**/
private byte[] EncodeFormat2(float[] data)
{
byte[] rs = codecDownSampler.inputResample(Converters.floats2bytes(data), data.Length);
float[] f = Converters.bytes2floats(rs);
float[] mono = Converters.stereo2mono(f);
short[] shorts = Converters.floats2shorts(mono, true);
int bytes = (int)(shorts.Length / 2);
byte[] output = new byte[bytes];
encode2.Encode(encode2State, output, shorts, shorts.Length);
return(output);
}
/**
* FORMAT 1
* G722 48kHz stereo
**/
private byte[] EncodeFormat1(float[] data)
{
short[] shorts = Converters.floats2shorts(data, true);
// DeMux into Left and Right
List <short[]> lr = Converters.deMuxStereo(shorts);
// CALCULATE NUMBER OF BYTES IN OUTPUT
int bytes = (int)(lr[0].Length / 2);
byte[] outputL = new byte[bytes];
byte[] outputR = new byte[bytes];
encode1L.Encode(encode1Lstate, outputL, lr[0], lr[0].Length);
encode1R.Encode(encode1Rstate, outputR, lr[1], lr[1].Length);
byte[] output = new byte[outputL.Length + outputR.Length];
Array.Copy(outputL, output, outputL.Length);
Array.Copy(outputR, 0, output, outputL.Length, outputR.Length);
return(output);
}