Re: ALSA Fireworks driver

[Doug McLain <doug@nostar.net>]

Nice, now I have it up and running with my preferred SR of 48Khz, and it 
seems to be stable.  I figured out the git stuff since the last email I 
sent.  I didn't know how to browse and switch to various branches, so I 
kept getting the wrong files in sound/firewire.

Thanks for the help,
Doug

On 06/21/2011 07:38 AM, Clemens Ladisch wrote:
> Doug McLain wrote:
>> It looks like 44.1Khz is the default setting the AF12 powers up at, and
>> the alsa driver doesn't know how to change SR yet, is this the case?
>
> Actually, the driver knows quite well how to change SR, and does this to
> initialize the device to 44.1 kHz.  However, this driver was intended as
> a prototype, so I didn't bother to implement making the other SRs
> available to ALSA applications.
>
>> FYI I tried #define FIXED_RATE 48000 just to see if I could use the
>> driver at 48K for soem recording sessions today.
>
> This should work if you also change FIXED_RATE_SFC (0...6 = 32/44.1/48/
> 88.2/96/176.4/192 kHz).
>
>> Aplay plays wav files using plughw, but not hw.
>
> This is to be expected if your .wav doesn't have twelve channels of
> 32-bit samples.
>
>> I also wonder if you can explain to me how to clone just that driver so
>> I can keep up with it correctly using git pull.  I'm a little weak on
>> git.  I just grabbed the .c and .h files manually and made my own
>> Makefile for standalone module building.
>
> The driver is in a kernel repository because it is part of the kernel;
> using it with other kernel versions would require back-porting any
> changes in the kernel API (as you did this with the CSR_ symbols).
>
> Current development is in the firewire-kernel-streaming branch, where
> the drivers are composed of more files and depend on some changes in
> the core kernel.  There is no easy way of using these with another
> kernel.
>
>
> Regards,
> Clemens