Messages

1

Audio / Re: How to split channels

« on: April 25, 2018, 07:21:40 pm »

I have no idea where you heard that

Actually, this is the bad source, though probably I misread it
https://stackoverflow.com/questions/48804523/is-it-possible-to-split-left-and-right-channel-from-audio-sample-in-sfml

Hope that helps.

It really helps a lot!! Thank you!! I've been stuck for hours thinking about how to split those 16 bits. 

2

Audio / How to split channels

« on: April 25, 2018, 06:49:39 pm »

Hi!

I am loading a WAV file with sf::InputSoundFile in C++ and I want to extract the samples for each channel separately. As far as I know the method sf::InputSoundFile::read(Int16 *samples, Uint64 maxCount) writes an array of interleaved samples to samples. Each sample is then made up by 16 bits, the first 8 belonging to a channel, and the remaining 8 belonging to the other. My silly question is: should I consider each 8-bits part as an Int8 or as a Uint8? I am very much confused.

A code snippet that performs the conversion from interleaved to separate channels would be also appreciated! 

What follows is my attempt to do this conversion.

sf::Int16 samples[1024];
sf::Int16 mono[1024];
file.read(samplesData, 1024);
if (file.getChannelCount() == 2){
  for(int k = 0; k < 1024; ++k){
    sf::Int16 right = samples[k] & 0x00FF;
    sf::Int16 left = (samples[k] & 0xFF00) >> 8;
    mono[k] = (right+left)/2; // mean of the two channels
  }
}