[alsa-devel] Using speaker-test for sound cards which dont support mmap

Clemens Ladisch cladisch at fastmail.net
Thu Jul 12 09:08:56 CEST 2007

Pharaoh . wrote:
> Is it possible to use speaker-test for sound cards which do not support
> mmap?

If a sound card does not support DMA, the driver has to copy the samples
from ALSA's buffer to the hardware with some other mechanism.  However,
there is always the ALSA buffer that can be mmap()ed to userspace.

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