[maemo-developers] a2dp bluez 3.11 and libhal-dev

[From: Jesse Guardiani]

Hmmm... I wrote an mp3 to a wav and played the wav through a2dpd. Same
choppy playback, but the CPU isn't maxed out. I see a lot of disconnects
and reconnects in the a2dpd log. I wonder if something else is going on
here...


Jesse Guardiani wrote:
> Good to know. I built pcm.a2dpd2 and it doesn't seem to help. In all
> fairness though, mplayer is chewing up just as much CPU as a2dpd since
> it has to use libmp3 instead of the dspmp3 pass-through. If either end
> could be further optimized then it might become usable, though perhaps
> still not quite battery friendly.
> 
> 
> Brad Midgley wrote:
>> Jesse
>>
>> If you're using plugz it seems that you would be linking the external
>> libsbc, not the version inside bluez. As of about two months ago, the
>> standalone sbc project had our best version of the (mostly) 32-bit
>> fixed-point codec. fwiw, the sbc inside bluez was only put there once we
>> had it nailed down in the external project.
>>
>> the a2dpd2 alsa plugin was introduced by Frederic Dalleau to try to
>> observe best practices for an alsa plugin (things in a2dpd plugin like
>> usleep() calls were avoided) so you could try that next.
>>
>> there's some room for improvement in the sbc codec (see the todo list in
>> sbc.c) and we may even see some of the Brazilian dsp masters try their
>> hand at moving it to the dsp.
>>
>> Brad
> 
> 


-- 
Jesse Guardiani
Programmer/Sys Admin
jesse at guardiani.us