On Sun, 4 Mar 2007 01:35:28 +0200
"Maen Suleiman" <maen.suleiman@xxxxxxxxx> wrote:
> Hi ,
>
> My hardware uses a 20bit PCM format packed in 32bit, , I am using a
> 2.6.12 kernel and such a format doesn't exist, is the following enough
> for defining this format:
>
> 1) defning a new value in 'enum sndrv_pcm_format'
> 2) adding new entry to pcm_formats[SNDRV_PCM_FORMAT_LAST+1] array
> that describes the new format .
>
> [SNDRV_PCM_FORMAT_S20_NEW_LE] = {
> .width = 20, .phys = 32, .le = 1, .signd = 1,
> .silence = {},
> },
I suggest SND_PCM_FORMAT_S20_LE (ie. 20 bits signed data right-aligned in 32
bits frame). I never had a serious look at that code, but you at least also
have to add a lot of conversion functions to/from S20_LE in
alsa-lib/src/pcm/plugin_ops.h (look for #ifdef CONV_LABELS) which are used
by alsa-lib/src/pcm/pcm_linear.c:snd_pcm_linear_convert() and by many other
plugins.
--
Giuliano.
-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys-and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV
_______________________________________________
Alsa-devel mailing list
Alsa-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/alsa-devel
