[MPlayer-users] Re: audio filters drain the cpu

[Fredrik Eriksson]

Tobias Diedrich wrote:

>Fredrik Eriksson wrote:
>  
>
>>playing a audiofile like
>>
>>mplayer music.mp3
>>
>>works just fine, without any notable cpu usage. However, trying to use a 
>>audiofilter, like
>>
>>mplayer -af sub music.mp3
>>
>>or
>>
>>mplayer -af surround music.mp3
>>    
>>
>
>I can reproduce that on my SB Live.
>Can you try the attached patch and see if it makes the problem go away for you?
>
>It seems like snd_pcm_status_get_avail returns something not a
>multiple of chunk_size, but snd_pcm_writei only writes multiples of
>chunk_size.  The while-loop in ao_alsa then retries with the remainder
>and the next call to snd_pcm_writei is busy-waiting.
>  
>
That patch worked somewhat, now most of the time the cpu usage is down 
to a more reasonable level (about 1-2%), but at times it still goes up 
to 99-100% for no apparent reason, and then goes down again.

Fredrik