Re: ATI IXP hardware mixing

["Clemens Ladisch" <cladisch@fastmail.net>]

Zephiris wrote:
> I'm trying to get the ATI IXP driver to use hardware mixing.
> [...] all I want is to know is what to change in the source that needs
> to support it, since several glances through the source and brief API
> docs, as well as mailing lists, etc, don't reveal effectively nothing
> supporting hardware mixing at all.

It's documented in the description of snd_pcm_new() in the section
"Constructors":
| The fourth and fifth arguments are the number of substreams for
| playback and capture, respectively. [...]
| If a chip supports multiple playbacks or captures, you can specify
| more numbers, but they must be handled properly in open/close, etc.
| callbacks. When you need to know which substream you are referring to,
| then it can be obtained from struct snd_pcm_substream data passed to
| each callback as follows:
| 
|   struct snd_pcm_substream *substream;
|   int index = substream->number;

Then you have to use that index to access the corresponding DMA engine
of the hardware.


Regards,
Clemens

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