[alsa-devel] what is period_size, buffer_size and boundary size, i confuse them

Clemens Ladisch clemens at ladisch.de
Sun Dec 9 17:22:27 CET 2012

l9jj wrote:
> can anyone help me to figure out  the concepts between period_size ,buffer_size and boundary size?
> n * period_size = buffer_size?

Yes.  On many devices, n is not required to be an integer.

> m * buffer_size = boundary_size?

Yes, where m is very big.  In applications, the actual value of the boundary
size does not matter (except as a special value for some sw params).

> and how the dma buffer mapped to the alsa buffer?

The DMA buffer _is_ the ALSA buffer.


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