[alsa-devel] Still have choppy audio using 1.0.17

Gustavo da Silva Serra gustavo.serra at tet.com.br
Tue Jul 1 20:28:39 CEST 2008

I have tried to implement the solution you proposed. However I still get 
choppy audio, just like before, otherwise the sound is clear.

Basically I moved the timer to the cable struct, and updated the timer 
function to update both playback and capture.
I am sending the code attached so you can see if I implemented what you 
suggested. The code is not very clean, nor completely functional, as I 
never programmed to kernel before, and might cause kernel panic when 
closing a stream.

Any other suggestions?
Thanks for the help and the attention.

Takashi Iwai escreveu:
> At Wed, 25 Jun 2008 08:24:33 -0300,
> Gustavo da Silva Serra wrote:
>> If I keep the difference between the playback and capture pointers at 
>> one period, no choppy audio occurs. If the difference is 0, 2 or 5 
>> periods for example, choppy audio will always occur. Any ideas why?
> Through a quick look at the code, it's likely the problem of the
> timing of timer handlers for playback/capture streams.  In the current
> code, the timer handlers are invoked individually.
> One possible fix would be to force to synchronize the updates of both
> directions instead of individual timers.  That is, share the same
> timer for the connected streams so that the update order is
> guaranteed.
> Just my $0.02.
> Takashi
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