> Right, that's not a permissions problem. It means that audiotest.c > tried to set your hardware to unsigned 8-bit samples: > > fmt = AFMT_U8; /* 8 */ > ioctl(fd, SNDCTL_DSP_SETFMT, &fmt); > > and the device driver refused, returning fmt == AFMT_S16_LE == 16 > (signed 16-bit little-endian), which seems to be the *other* > lowest-common-denominator audio format. > > > Maybe the audio hardward on the work box simply isn't capable of doing > > anything besides 16-bit samples? According to hwbrowser, it is > > I suspect that is the case. > > The good news is that I've modified audiotest.c so it now takes > command-line options to set the sample format, eg. > > audiotest -b 16 -s > > for signed, little-endian 16-bit samples. (Currently little-endian is > hardcoded.) Trying this with the latest version gives: opening /dev/dsp ... done audiotest: error: /dev/dsp: unable to set number of channels to 1 (got 2) > The bad news is that there's something wrong with my sine-wave > generating code for 16-bit samples: I'm quite sure that both of the > audio devices on my PC support both 8-bit and 16-bit audio, but the > 16-bit sine waves produced by audiotest.c sound horribly wrong. > > I suspect a second pair of eyeballs is needed here. Can someone take a > good hard look at nondist/sandbox/audiotest/audiotest.c, in particular > the mkbuffer() and gen_sine() functions, and see if you can spot > anything wrong? It's probably a silly arithmetic error indicating a > subtle misunderstanding on my part, but I'm stumped. When this happened to me in a previous life, the byte order was wrong. > > The home box (which works) is > > > > CRD-8400B > > Manufacturer: Unknown > > Driver: ignore > > Device: /dev/hdc > ^^^^^^^^ > > Wow, I wonder what hwbrowser is smoking. I strongly advise you *not* to > start writing audio data to /dev/hdc. ;-) What's /dev/hdc??? --Guido van Rossum (home page: http://www.python.org/~guido/)
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