[alsa-devel] Which project to choose?

[Jaroslav Kysela]

On Wed, 14 Jul 2010, David Henningsson wrote:

> 2010-07-14 13:13, Raymond Yau skrev:
>
>> localhost pulseaudio[24553]: alsa-util.c:   appl_ptr     : 735801008
>> localhost pulseaudio[24553]: alsa-util.c:   hw_ptr       : 735846184
>>
>> This is underrun as you can see appl_ptr is behing hw_ptr
>
> Ehm, isn't that a ring buffer? I e, there is nothing wrong with appl_ptr
> being less than hw_ptr.

For playback, if appl_ptr is less than hw_ptr, it's underrun situation 
(application didn't feed samples in time to the driver's ring buffer).

Note that pointers in ALSA are in range 0..boundary not 
0..ring_buffer_size (boundary is near LONG_MAX value) - it's design to 
detect such situations (underrun, overrun).

 						Jaroslav

-----
Jaroslav Kysela <perex at perex.cz>
Linux Kernel Sound Maintainer
ALSA Project, Red Hat, Inc.