Dear nia, On 2020-03-13, nia wrote: > On Tue, Mar 10, 2020 at 08:49:55PM +0200, Yorick Hardy wrote: > > Can anyone else record audio correctly via ossaudio? > > audiorecord seems to work as long as the frequency > > divides the native frequency (see dmesg excerpt below) > > (I missed this post, but got contacted about it directly off-list. I'm > probably a good person to contact about this sort of thing).
Thanks, I watched your recent talk :-) > The sample rate and number of channels need to exactly match the device > for ideal output. Right, but I think it should not be a problem if it is different (subject to some quality loss) because of the new audio system? > > The ffmpeg OSS code looks very primitive. I might be persuaded to write > a backend that does detection of device characteristics. It's basically > required for proper audio recording on NetBSD. Note that our OSS emulation > doesn't match the spec exactly, and is also undocumented, so doing anything > non-trivial is hard. I don't recommend writing new code that uses it for > that reason. You are correct. I threw together a NetBSD audio driver based on the oss driver, but it had exactly the same problem. Strangely, I have been unable to reproduce the problem on an old i386 netbook (so far). I wrote a test program to try and reproduce what ffmpeg is doing, and (I am not sure yet) it seems like non-blocking reads is causing the distortion. The same test program with blocking reads seems to work okay. I will look into it a bit more, and then report back. > Out of curiosity, does Audacity work for you (when set to single channel > 16-bit PCM, etc - it defaults to 32-bit floats which won't work). I am building it ... my computer is quite old! I will report back once I have tried it out. -- Kind regards, Yorick Hardy
