[alsa-devel] trace PCM data from usb bus to alsa lib

[Takashi Iwai]

At Wed, 17 Jun 2009 07:25:25 +0000 (UTC),
ZeroCluo wrote:
> 
> Hi 
> 
>   I am trying to trace the Audio data from usb bus.
> in kernel: 
> dump data in retire_capture_urb() ,found data format is like:
> AABB 0000 CCDD 0000 ;
> 
> but in alsa library ,
> dump data in snd_pcm_mmap_begin(),the "0000" is cut,only "AABB CCDD",
> 
> Do you know when and where those "0000" is cut?

Are you using the native format that the hardware runs?


Takashi