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

[Clemens Ladisch]

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.