At Mon, 7 Apr 2008 17:49:26 +0300, Alexander Indenbaum wrote:

Hello,

I'm trying to integrate Firefox Flash plugin with ASLA IO plug driver for proprietary hardware.

I've found out that Flash Plugin ASLA client side (sources could be found at http://labs.adobe.com/wiki/index.php/Flash_Player:Additional_Interface_Suppo...) is incompatible with IO Plug.

Oh, it's a good finding. Thanks for the pointer.

The reason is that during initialization Flash Plugin calls snd_async_add_pcm_handler() which always return -ENOSYS out of snd_pcm_ioplug_async(). This error causes Flash Plugin ALSA client code to fail.

Is there a good reason why snd_pcm_ioplug_async() unconditionally return -ENOSYS? Is it possible to implement IO Plug async interface?

Well, this is simply because I haven't supposed that the async interface is ever used by such apps. The async feature is pretty system-specific and it wouldn't work with the strict POSIX implementation. It practically works right now, though :)

So, I'm pretty open for any implementation of this if the user-space driver can provide any functionality. Most likely we need to add a new callback, so the ABI would change. But, as long as the backward compatibility is kept, I'm for any addition.

thanks,

Takashi