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

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.

_From the point of view of userspace applications, all sound cards support mmap.

Regards, Clemens