Hi, You can use SNDCTL_DSP_SETFMT to set the device to 16bit. <snip> fmt = AFMT_S16_NE; ioctl(fh, SNDCTL_DSP_SETFMT, &fmt); <snip> Where 'fh' is the file handle to /dev/dsp returned by 'open'. You should also make sure the number of channels & the speed are what you want rather than relying on defaults. These ioctls are SNDCTL_DSP_CHANNELS & SNDCTL_DSP_SPEED. Regards Phil Q Phil Quiney, Senior Software Engineer Trinity Convergence Cambridge Business Park Cowley Road Cambridge CB4 0WZ, UK T: +44(0)1223-435536 F: +44(0)1223-435560 www.trinityconvergence.com <http://www.trinityconvergence.com/>
________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Gabriele Filosofi Sent: 11 September 2008 13:22 To: davinci-linux-open-source@linux.davincidsp.com Subject: using dev/dsp along with a 16bit codec Hi, I've found that in the OSS framework the /dev/dsp device uses 8-bit unsigned linear encoding, while the /dev/dspW device uses 16-bit linear encoding. Any data written to the davinci audio device should be played back with the on-board codec (AIC33), that is configured with 16 bit per sample. But in the /dev folder I don't find the /dev/dspW file! Also, I've found some people use fdw ( "/dev/sound/dsp", O_WRONLY); ... write ( fdw, buffer, 64); /* where buffer in an array of unsigned chars */ I'm wondering one can access a 16-bit audio codec using /dev/dsp. If anyone knows it, can you please give some suggestions to understand it? Tanks. Regards, Gabriele Filosofi
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