On Tue, May 27, 2008 at 6:54 PM, Hannu Savolainen <[EMAIL PROTECTED]> wrote: > You said that this problem happens wit mplayer but not with ossplay and > osstest. Does it happen with any other audio/video player such as xmms > or xine?
I wasn't clear. The problem happens when anything attempts to manipulate the mixer, including ossmix and ossxmix. Mplayer was just an example of a player that has a mixer. I also gave gnome-volume-control as an example. The problem (distorted sound) occurs when you modify the volume level (AND mixer dial), for as long as you keep modifying it. It is apparent in the PCM sound output (ie. sounds coming from players of all kinds being played). It doesn't affect Line-In (probably because the tuner is an old model with an external output that comes into Line-In in the soundcard, so there's probably no processing other than mixing. When there's no PCM sound playing, I don't get audible distortions, but the application currently attempting to change the mixer still exhibits the sluggish behaviour. What I said about ossplay and osstest was that they seem to always ignore mixer settings and play at full volume, including the dB values which are the only ones that seem to work in my mixer at this point. But I still get distorted sound if ossplay or osstest are playing and I change the mixer. > If it happens only with mplayer then this means the bug must be in > mplayer (which seems to have seriously broken OSS plugin). The problem is merely manifested when a player app plays something over PCM (any app, including ossplay). It doesn't have anything in particular to do with any player, it's just that it affects the global PCM sound output. It also happens with ossplay, osstest, alsaplayer (this is what I had around). It doesn't happen if I change volume from Rhythmbox, or from Mplayer using SDL output. I'm suspecting the intermediate layer (gstreamer/SDL) does software mixing. BUT it happens with them too if I use another mixer while they're playing (even over SDL/gstreamer). Example: I start playback in Rhythmbox or Mplayer with SDL output: SDL_AUDIODRIVER=dsp mplayer -ao sdl:dsp -- test.wav I change volume from within the app, it changes nicely. I change it from outside (ossmix or any other mixer app): I get distortion each time I move a slider. I also tried Audacious but couldn't get it to work (got SNDCTL_DSP_SETFMT ioctl failed: Operation not permitted), perhaps outdated OSS API? If I ever get OSS working properly I'll have to bug the developer into fixing that if I ever expect to use it again. > Another good > guess is that the problem is related with X11 or the display driver. I've tried it into the console, no X running, no framebuffer, no video modules loaded. Same thing happens. > Btw, does the graphics card have a proper driver installed or does it > use some generic (VESA/SVGA) one? It's the latest from NVidia (it's a GeForce 4 MX), I believe: NVIDIA-Linux-x86-96.43.05-pkg1.run _______________________________________________ oss-devel mailing list oss-devel@mailman.opensound.com http://mailman.opensound.com/mailman/listinfo/oss-devel
