static unsigned int capture_period_sizes[31] = {
384, 448, 512, 640,
384*2, 448*2, 512*2, 640*2,
384*4, 448*4, 512*4, 640*4,
384*8, 448*8, 512*8, 640*8,
384*16, 448*16, 512*16, 640*16,
384*32, 448*32, 512*32, 640*32,
384*64, 448*64, 512*64, 640*64,
384*128,448*128,512*128
};This makes the minimum period size that I can record from the MIC to be 384 frames.
I would like period sized to be 20ms (Used by the GSM codec) in length for a VoIP application I am working on. VoIP generally works with 8000Hz sample rate to match that on Telco ISDN/Digital trunk lines.
If the sample rate is 8000Hz, a period size of 384 frames makes for a 48ms which would add too much latency to the conversation.
Ideally I would like to set the minimum period size to be 160 frames which is 20ms.
Is there any technical reason why I cannot just add 160 to the table above?
If it is ok, can someone please add it to the alsa-driver tree.
Cheers James
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