Re: Calibrating Buffer Size and Count

On Friday, May 28, 2010 12:14:47 pm Kip Warner wrote:
> Thanks Chris. What about the size of the individual buffers? How do you
> determine how large they should be? I see the term "frame size" and
> "buffer size" used in a couple places and I'm not sure what the
> difference is.

A "frame size", in this case, is the size of a single sample multiplied by the 
channel count (ie. channels * bits / 8; which would be 4 for 16-bit stereo, or 
1 for 8-bit mono, for example). A "buffer size" would be the size of a given 
buffer (typically in bytes, but sometimes it may be measured in frames or even 
time).

So, for instance, you would generate 4 to 8 buffers, and fill them each with 
frequency/4*channels*bits/8 bytes (where frequency, channels, and bits are 
taken from the stream data format that's given to OpenAL):

int framesize = stream->channels * stream->bits / 8;
BytesPerBuffer = stream->Freq / 4 * framesize;

When queued onto a source, the buffers should give a total play time of one to 
two seconds before it all runs out, and approximately 1/4th of a second 
between each buffer.
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