Mono to Stereo conversion

Question

I have the following issue here: I get a block of bytes (uint16_t*) representing audio data, and the device generating them is capturing mono sound, so obviously I have mono

Answer 1

You need to interleave the data, but if the frame length is anything greater than one, none of the above solutions will work. The below code can account for variable frame lengths.

void Interleave(BYTE* left, BYTE* right, BYTE* stereo,int numSamples_in, int frameSize)
{
    int writeIndex = 0;
    for (size_t j = 0; j < numSamples_in; j++)
    {
        for (int k = 0; k < frameSize; k++)
        {
            int index = j * frameSize + k;

            stereo[k + writeIndex] = left[index];
            stereo[k + writeIndex + frameSize] = right[index];
        }
        writeIndex += 2 * frameSize;
    }
}