On 6/9/08, Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > On Fri, Jun 06, 2008 at 08:00:04PM -0400, Jon Smirl wrote: > > > Why is the AC97 format set to S16 in all of the drivers? The link is > > 20b and my codec takes 20b, how do I get 20b data to the device? I > > tried using SNDRV_PCM_FORMAT_S20_3BE but all I get is static. > > > The format that is set needs to correspond to what your AC97 controller > needs as input. The setting for the codec just needs to match one of > the supported ones for the controller - the specific memory layout of > the data should not be important, the controller ought to reformat the > data into whatever is appropriate for the bus. > > This isn't entirely ideal but in practice works well since most > controllers need samples in pretty much the form they're outputing and > so the sample size in RAM usually needs to correspond to the sample size > that appears on the bus. > > As Clemens said, try S32. > The format is in three places: codec dai platform dai dma driver Isn't the wm9712 an AC97 controller? on pxa.. codec dai = SNDRV_PCM_FMTBIT_S16 | SNDRV_PCM_FMTBIT_S24 platform_dai = SNDRV_PCM_FMTBIT_S16_LE dma driver = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE, I tried copying this. It sends 16 bit sound through the system. I'll try this next.. codec dai = SNDRV_PCM_FMTBIT_S32 platform_dai = SNDRV_PCM_FMTBIT_S32_BE dma driver = SNDRV_PCM_FMTBIT_S32_BE -- Jon Smirl jonsmirl@xxxxxxxxx _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
