Re: [alsa-devel] 24 bit sample embedded in 32 bits

Vipin Kumar wrote:

I assume that the alsa framework expects the 24 bit sample data to be packed one after the other.

ALSA expects the sample data to conform to whatever sample format has been configured.

Most hardware uses 32-bit sample words in memory to make the interface to the PCI bus easier.

I need to find a way to tell the framework that the data is 24bit but is embedded in 32 bit.

(HH = highest byte, LL = lowest byte, MM = middle byte)

LL MM HH SNDRV_PCM_FORMAT_S24_3LE xx LL MM HH SNDRV_PCM_FORMAT_S32_LE LL MM HH xx SNDRV_PCM_FORMAT_S24_LE HH MM LL SNDRV_PCM_FORMAT_S24_3BE HH MM LL xx SNDRV_PCM_FORMAT_S32_BE xx HH MM LL SNDRV_PCM_FORMAT_S24_BE

Regards, Clemens