[alsa-devel] trace PCM data from usb bus to alsa lib
Zero.CLuo at gmail.com
Wed Jun 17 09:25:25 CEST 2009
I am trying to trace the Audio data from usb bus.
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?
btw,use mmap method map dma_area to user space; and use snd_pcm_readi to get
Thank you very very much.
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