HelenOS sources

DSP_MODE_STEREO   239 uspace/drv/audio/sb16/dsp.c 	    dsp->active.samples / ((dsp->active.mode & DSP_MODE_STEREO) ? 2 : 1);
DSP_MODE_STEREO   420 uspace/drv/audio/sb16/dsp.c 	    (channels == 2 ? DSP_MODE_STEREO : 0);
DSP_MODE_STEREO   496 uspace/drv/audio/sb16/dsp.c 	    (channels == 2 ? DSP_MODE_STEREO : 0);
HelenOS homepage, sources at GitHub