ALSA Driver, arguments to snd_pcm_hardware

maheshstms · 12-04-2008, 12:33 AM

Hi,
I am writing my first ALSA sound driver,

I have a problem providing rate value in struct snd_pcm_hardware, for my sound card.

My sound card is interfaced to the M/B through SSI interface.
As per my Sound card manual he says it works at 128, 256, 512 ... 16384Kb/Sec.

The default range values are very less.

How do I provide range values, period min, and max??

-Mahesh

cladisch · 12-04-2008, 02:46 AM

Quote:

I have a problem providing rate value in struct snd_pcm_hardware, for my sound card.

My sound card is interfaced to the M/B through SSI interface.
As per my Sound card manual he says it works at 128, 256, 512 ... 16384Kb/Sec.

The nominal bandwidth of the SSI is not necessarily related to the data rate of the PCM stream.

Quote:

The default range values are very less.

How do I provide range values, period min, and max??

This depends on the capabilities of the DMA controller, the SSI hardware and the codec.

You'd better ask on the alsa-devel list, and it would be helpful to provide information about your hardware.