[alsa-devel] Access to bytes from the raw audio stream? (AC'97)

Hi there,

I'm new to ALSA, and working on a project where I need to find out where I can see/modify the raw bytes coming in from/going out to a device. The device is an AC'97 codec (a philips UCB1400, if it makes any difference...) on an embedded board.

I tried looking on the web, and found the tutorial at http://www.alsa-project.org/~tiwai/writing-an-alsa-driver/, but that seems to be more about device management and configuration.

So, can anybody tell me what functions and files in the sound/ directory of the linux kernel I need to look at to see/modify the raw data stream coming in? Am I just missing something in the tutorial? I'd appreciate any suggestions very much.

Thanks,

John Graham