[alsa-devel] [PATCH] crec: Add option to specify codec ID

[Vinod Koul]

On Wed, Nov 16, 2016 at 02:53:21PM +0000, Richard Fitzgerald wrote:
> On Wed, 2016-11-16 at 13:48 +0000, Charles Keepax wrote:
> > On Wed, Nov 16, 2016 at 01:07:55PM +0000, Richard Fitzgerald wrote:
> > > On Wed, 2016-11-16 at 18:35 +0530, Vinod Koul wrote:
> > > > On Wed, Nov 16, 2016 at 11:44:09AM +0000, Richard Fitzgerald wrote:
> > > > > This patch adds a -I command line option to set the codec ID,
> > > > > either from a defined set of string values or as a number.
> > > > 
> > > > Can you explain why you want to add this? The utility cant really record a
> > > > mp3 file!
> > > 
> > > You need to be able to pass a codec ID that the driver supports, and to
> > > indicate which codec you're trying to use. It's not useful to only be
> > > able to open the "PCM" codec. It doesn't really matter whether crec
> > > understands the content of the data, we're just pulling raw data, most
> > > likely for test/debug.
> > > 
> > > The wm_adsp driver on Wolfson/Cirrus codecs uses the new BESPOKE stream
> > > ID so we need a way to pass that. And we'd also need it for any drivers
> > > that had streams using other codec IDs.

Ah that was my guess too.

I am okay to be able to add bespoke format and use that to dump raw data.
But I am not okay to add codec formats which we dont support..

> > Is the objection here not that crec is wrapping the data with
> > a WAV file? Should we perhaps just expand this so that if you
> > request a different format it uses the raw data mode that it uses
> > when you let the output go to stdout.
> > 
> 
> Funny I thought we'd already added a flag for saving to the file raw.
> It's raw when you pipe it to stdout.

-- 
~Vinod