[alsa-devel] ALSA Fireworks driver
doug at nostar.net
Tue Jun 21 14:57:57 CEST 2011
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,
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
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