/// <summary>
/// Encodes an array of 16-bit samples in a roughly equivalent set of 8-bit samples and downsamples them from 16Khz to 8Khz
/// </summary>
/// <param name="rawFrame">A byte-array of the 16-bit 16-Khz source samples</param>
/// <param name="start">The starting index of the source samples IN BYTES</param>
/// <param name="length">The length IN BYTES of the samples</param>
/// <param name="encodedFrame">The byte array in which to place the encoded 8-bit samples</param>
/// <param name="isSilent">Whether the frame is silent or not</param>
/// <returns>The length IN BYTES of the encoded data</returns>
public int Encode(byte[] rawFrame, int start, int length, byte[] encodedFrame, bool isSilent)
{
if (isSilent)
{
return(0);
}
int encodedPos = 0;
for (int i = start; i < start + length; i += _byteStep)
{
short rawSample = G711.ToShort(rawFrame[i], rawFrame[++i]);
encodedFrame[encodedPos++] = G711.LinearToULawFast(rawSample);
}
return(encodedPos);
}
/// <summary>
/// Encodes an array of 16-bit samples in a roughly equivalent set of 8-bit samples and downsamples from 16Khz to 8Khz
/// </summary>
/// <param name="rawFrame">A short-array of the 16-bit source samples</param>
/// <param name="start">The starting index of the source samples IN SHORTS</param>
/// <param name="length">The length IN SHORTS of the samples</param>
/// <param name="encodedFrame">The short array in which to place the packed and encoded 8-bit samples</param>
/// <param name="isSilent">Whether the array contains silence</param>
/// <returns>The length IN SHORTS of the encoded data</returns>
public int Encode(short[] rawFrame, int start, int length, short[] encodedFrame, bool isSilent)
{
if (isSilent)
{
return(0);
}
int encodedPos = 0;
for (int i = start; i < start + length; i += _shortStep)
{
byte b1 = G711.LinearToULawFast(rawFrame[i]);
i += _shortStep;
byte b2 = G711.LinearToULawFast(rawFrame[i]);
encodedFrame[encodedPos++] = G711.ToShort(b1, b2);
}
return(encodedPos);
}
