internal virtual byte[] GetData()
{
byte[] array = new byte[8];
LittleEndianHelper.WriteIntU(m_escherHeader, array, 0);
LittleEndianHelper.WriteIntU(m_cbLength, array, 4);
return(array);
}
private static void ToSamplesFromPcm(byte[] input, int bitsPerSample, int channelCount, float[] output, int channel, bool interleaved)
{
int x, xc, i, ic;
if (interleaved)
{
x = channel;
xc = channelCount;
}
else
{
x = 0;
xc = 1;
}
i = channel * bitsPerSample / 8;
ic = channelCount * bitsPerSample / 8;
switch (bitsPerSample)
{
case 8:
while (x < output.Length)
{
output[x] = ((input[i] / 255f) * 2f) - 1f;
x += xc;
i += ic;
}
break;
case 16:
while (x < output.Length)
{
output[x] = LittleEndianHelper.ReadInt16(input, i) / 32768f;
x += xc;
i += ic;
}
break;
case 24:
while (x < output.Length)
{
output[x] = LittleEndianHelper.ReadInt24(input, i) / 8388608f;
x += xc;
i += ic;
}
break;
case 32:
while (x < output.Length)
{
output[x] = LittleEndianHelper.ReadInt32(input, i) / 2147483648f;
x += xc;
i += ic;
}
break;
default:
throw new Exception("Invalid sample format: PCM " + bitsPerSample + " bit.");
}
}
//returns raw audio data in little endian form
private static void ToPcmFromSamples(float[] input, int bitsPerSample, int channels, byte[] output, int index)
{
switch (bitsPerSample)
{
case 8:
for (int x = 0; x < input.Length; x++)
{
output[index] = (byte)((input[x] + 1f) / 2f * 255f);
index += channels;
}
break;
case 16:
for (int x = 0; x < input.Length; x++)
{
LittleEndianHelper.WriteInt16((short)SynthHelper.Clamp(input[x] * 32768f, -32768f, 32767f), output, index);
index += channels * 2;
}
break;
case 24:
for (int x = 0; x < input.Length; x++)
{
LittleEndianHelper.WriteInt24((int)SynthHelper.Clamp(input[x] * 8388608f, -8388608f, 8388607f), output, index);
index += channels * 3;
}
break;
case 32:
for (int x = 0; x < input.Length; x++)
{
LittleEndianHelper.WriteInt32((int)SynthHelper.Clamp(input[x] * 2147483648f, -2147483648f, 2147483647f), output, index);
index += channels * 4;
}
break;
default:
throw new ArgumentException("Invalid bitspersample value. Supported values are 8, 16, 24, and 32.");
}
}
