On Fri, 27 Apr 2007, Gordon Miller wrote:
Hi
All my snd_pcm_readi calls return too few frames. Also when I switch to stereo, the sound is muted. I cannot change this by adjusting period & buffer sizes. dsnoop is enabled by default. The documentation for snd_pcm_readi says that the only way that the frame count can be short is because of a signal or xrun. Well this clearly isn't the case.
I think that direct snoop is the cause of this. Are there any remedies ? because I am roundly SICK of being told that my application must be wrong "because everyone else's works". I have spent the last 3 weeks debugging an app - that always worked properly - because of the faulty dsnoop implementation.
It is abundantly clear that dsnoop is far from ready for use, but I am prepared to put some work into this. Whose idea was it to enable dsnoop by default, when it doesn't even work ? I was quite happy with OSS. Changing everything to be alsa entailed a lot of work, and I am beginning to think it was a complete waste of my time.
ICE1712, 2.6.20.6 kernel, alsa 1.0.14rc1
Send us a clear example which configuration does not work as you expect. We need:
a) simple test tool b) reproduce error with arecord c) debug output from snd_pcm_dump() before / while you read samples
It might be that it's no dsnoop fault, but some other plugin on way screw samples / stream position.
Your e-mail gives us nothing than "Houston, we have a problem". So it's almost useless.
Jaroslav
----- Jaroslav Kysela perex@suse.cz Linux Kernel Sound Maintainer ALSA Project, SUSE Labs