Re: trident (Hoontech 4d Wave NX) dropouts with small buffersize.

[Takashi Iwai <tiwai@suse.de>]

At Tue, 5 Oct 2004 22:13:52 +0200,
Oliver Freyd wrote:
> 
> Hello,
> 
> I use snd-trident with OSS emulation to access my soundcard.
> Music plays nicely, xmms and the like, but after alsa-0.90
> or so the linux games began sounding distorted (like tuxracer,
> frozen-bubbles, mirrormagic, all SDL-games that my step-son likes...). 
> Now I done some more tests to find out where it comes from:
> 
> The games use /dev/dsp, and /proc/asound/card0/pcm0p/sub0/hw_params says:
> access: RW_INTERLEAVED
> format: S16_LE
> subformat: STD
> channels: 2
> rate: 22050 (22050/1)
> period_size: 512
> buffer_size: 1024
> tick_time: 10000
> 
> well, you hear drop outs, or even bits of sound repeated, sounds weird
> ( this doesn't happen with the standard OSS trident driver, BTW)
> I guess the game people want the buffer size small for low latency...
> Seems it is loosing some interrupts or so...
> 
> With xmms, buffer_size is 16384, and all is well...
> 
> Well, maybe anyone here on this list has an idea what has happened
> in the alsa drivers after 0.90 to trigger this bug.

No idea yet, but could you check whether this happens with ALSA native
apps?  For example, you can run aplay with --buffer-size and
--period-size options.  Pass above values to these options and see
whether the playback works.


> I'm running debian testing, 
> alsa-source-1.0.5a-3

It's old :)


Takashi


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