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From: stan <ghjeold_i_mwee@cox.net>
To: Gustavo da Silva Serra <gustavo.serra@tet.com.br>
Cc: alsa-devel@alsa-project.org
Subject: Re: Still have choppy audio using 1.0.17
Date: Tue, 15 Jul 2008 14:31:59 -0700	[thread overview]
Message-ID: <487D174F.70104@cox.net> (raw)
In-Reply-To: <487CEF00.1050207@tet.com.br>

Gustavo da Silva Serra wrote:
>> _______________________________________________
>>   
> It silences a whole period because the pointer inside aloop behaves like 
> that. Logging the pointer inside aloop I discovered that it is 
> incremented so fast inside timer function that when pointer function is 
> called, the pointer is not being incremented anymore. It is like a 
> concurrency issue: first the pointer will be incremented many times, 
> after that, the pointer function will be called many times with the same 
> pointer value. Later, the pointer will be incremented some more, and so 
> on...
> I wonder if this is not the problem, logging the pointer for my sound 
> card I see a different behavior: the pointer function return offset 
> between two periods.
> _______________________________________________

Sounds like this is a critical section that has no 
protection.  So the sequence is messed up.  In the 
regular sound card, there must be a semaphore or block 
to prevent this kind of behavior.  You could probably 
add the logic from the regular card to the aloop 
function and fix it.

  reply	other threads:[~2008-07-15 21:32 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-06-16 20:04 Still have choppy audio using 1.0.17 Gustavo da Silva Serra
2008-06-18 18:24 ` Gustavo da Silva Serra
2008-06-18 19:44   ` Gustavo da Silva Serra
2008-06-19 13:01     ` Gustavo da Silva Serra
2008-06-20 19:07       ` Gustavo da Silva Serra
2008-06-25 11:24       ` Gustavo da Silva Serra
2008-06-25 16:06         ` Takashi Iwai
2008-06-25 18:34           ` Gustavo da Silva Serra
2008-07-01 18:28           ` Gustavo da Silva Serra
2008-07-04 12:40             ` Gustavo da Silva Serra
2008-07-14 17:57               ` Gustavo da Silva Serra
2008-07-15  0:50                 ` stan
2008-07-15 11:56                   ` Gustavo da Silva Serra
2008-07-15 18:40                     ` Gustavo da Silva Serra
2008-07-15 21:31                       ` stan [this message]
2008-07-16 14:19                         ` Gustavo da Silva Serra
2008-07-16 15:30                           ` Takashi Iwai
2008-07-16 15:43                             ` Gustavo da Silva Serra

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