Re: Separating channels when recording stereo

On Wednesday, March 16, 2011 6:08:07 AM Alessandro Motta wrote:
> * What does the 16 in AL_FORMAT_STEREO16 really means?
> Does OpenAL record 16 bits per channel (16 bits for left, 16 bits for
> right) or does every channel use only 8 bits (8 bits left, 8 bits
> right = 16 bits)?

Hi.

Your first suggestion is correct. With AL_FORMAT_STEREO16, OpenAL records 16-
bit samples per channel. Two 16-bit values make up one frame.

> * How are the stereo samples separated from each other?
> Some people said that all samples with even index in the buffer array
> belong to the left channel. And all samples with odd indexes in the
> buffer array are right values. Which means:
> 
> int lft = buffer[2*i + 0];
> int rgt = buffer[2*i + 1];

This is correct, assuming 'buffer' is an array of shorts, int16_t, or similar 
signed 16-bit integer type. The first sample (index 0) is left, the second is 
right, the third is left, the fourth is right, etc.

Hope that helps.
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