[alsa-devel] Duplicate wake-ups in pcm_lib.c

[Raymond Yau]

2010/1/11 Jaroslav Kysela <perex at perex.cz>

> On Mon, 11 Jan 2010, Raymond Yau wrote:
>
>  2010/1/7 Jaroslav Kysela <perex at perex.cz>
>>
>>  On Wed, 6 Jan 2010, pl bossart wrote:
>>>
>>>
>>>
>>> The improved and more clean fix in now in my tree:
>>>
>>>
>>>
>>> http://git.alsa-project.org/?p=alsa-kernel.git;a=commitdiff;h=1250932e48d3b698415b1f04775433cf1da688d6
>>>
>>> Note that you should apply these 4 patches (in reverse order):
>>>
>>> 4: ALSA: pcm_lib - optimize wake_up() calls for PCM I/O
>>> 3: ALSA: pcm_lib - cleanup & merge hw_ptr update functions
>>> 2: ALSA: pcm_lib - add possibility to log last 10 DMA ring buffer
>>> positions
>>> 1: ALSA: pcm_lib.c - convert second xrun_debug() parameter to use defines
>>>
>>> Patch #3 should definitely fix problems with large avail or delay values
>>> reported in PA. I finally figured the culprit (and decide to cleanup all
>>> relevant code rather do just another workaround). In other words, new
>>> hw_ptr pointer should never be less than previous one now.
>>>
>>>                                               Jaroslav
>>>
>>> -
>>>
>>>
>> using alsa-driver-1.0.22.1.1.g231e3.14.g812cb and Fedora 12 inside Virtual
>> Box
>>
>> aplay -D plughw:0,0 /usr/share/sounds/alsa/*.wav
>>
>> "Front Left" sound as "Front Front Left" when playing "Front_left.wav"
>>
>> only when echo 4 > /proc/asound/card0/pcm0p/xrun_debug
>>
>
> Thanks for testing.
>
> It means that with other values is no sound generated?
>
> Could you use value 29 for xrun_debug and report all sound related messages
> from dmesg output after playback of "Front_left.wav"?
>
>                                        Jaroslav
>
> -----



do you mean 27 instead of 29 since the echo only occur when the value
contain XRUN_DEBUG_JIFFIESCHECK  bit  ?

aplay -Dplughw:0,0 and mplayer -ao alsa:device=hw=0,0 work normal

except when the value of xrun_debug contain XRUN_DEBUG_JIFFIESCHECK  bit  (
same result for the three  virtual box audio backend oss, pulseaudio and
alsa )