Re: Recording

[Takashi Iwai <tiwai@suse.de>]

At Sun, 23 Mar 2003 02:08:51 -0400,
Manuel Jander wrote:
> 
> Hello,
> 
> I'm having serious trouble implementing record support into the Aureal 
> Vortex driver.
> I get total lockups...
> 
> The obvious answer would be: the cards overwrites your kernel :) ... but 
> i double checked
> that. If that would be the case, playback wouldnt work either (i would 
> hear noise, or at least a crack).
> I'm using the same operator functions (callbacks) for recording and 
> playback with some very few
> branch code to decide between record and playback.
> 
> Is there something like a typical pitfal list ? Any important difference 
> when recording
> instead of playback ?

i don't know of any big differences between playback and capture
except for the hardwares which need buffer copy.

> Can i use runtime->dma_addr just as when doing 
> playback for
> the DMA address programmed into the SoundCard ?

yes.

hmm, what i would check are

- the buffer allocation and the hardware config are ok?
	-> check debug print in prepare()
- interrupts properly acknowledged?
	-> check the interrupt handler
- any spin dead locks?
	-> removing locks first (for UP)

and if alt+sysrq works, you can get the trace.


Takashi


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