[alsa-devel] Driver for a codec with built-in DSP for MP3 playback

[Dajun Chen]

Hi,

I mean example code of a driver which works either on PCM and MP3 (or other
compressed) audio stream.

Reagrds

David
On Mon, Mar 15, 2010 at 2:14 PM, Mark Brown <
broonie at opensource.wolfsonmicro.com> wrote:

> On Mon, Mar 15, 2010 at 02:02:39PM +0000, Dajun Chen wrote:
>
> > I am wondering where to find the guidances of developing a device driver
> for
> > a codec device which has a built-in DSP for MP3 (and tracks in other
> format)
> > playback and recording?
>
> OOI which device?
>
> I'm not sure what you mean by guidance here.  The standard thing would
> be to do it as a regular CODEC driver with a custom interface for
> userspace (eg, gstreamer) to talk to.  The best way of handling DAPM
> will depend on implementation but probably representing the output of
> the DSP as an input pin will be easiest.
>