[alsa-devel] compressed audio support (maruthi srinivas)

Vinod Koul vinod.koul at intel.com
Tue Dec 3 05:58:34 CET 2013

On Mon, Dec 02, 2013 at 03:24:51PM -0800, anish singh wrote:
> Both are compress framework driver files.
> compress_offload.c file is the one which interacts with userspace
> by using ioctl's, registers the compressed device with alsa
> framework(/dev/compress* gets created because of that),  calls
> the corresponding functions such as trigger, pointer update, copy
> and others when userspace pauses, plays and stops the playback
> or recording.
> soc_compress.c file is the file which interacts with compress_offload.c
> file to create a 'dev' node for compress driver.Basically when you
> register your compress driver with compress framework,alsa core
> will come to know that your dai support compress operations and
> it will create the dev node by using soc_compress.c file.The functions
> in this file gets called by compress_offload.c functions and who
> inturn gets called by the userspace.
> userspace->compress_offload.c->soc_compress.c->your_compress_driver.

this will work too, as i said you are not bound to asoc but to framework
like PCM. We can have PCM alsa driver like PCI or something else or ASoC


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