SNDCTL_DSP_CHANNELS
case SNDCTL_DSP_CHANNELS:
#define SOUND_PCM_WRITE_CHANNELS SNDCTL_DSP_CHANNELS
if (ioctl(fd, SNDCTL_DSP_CHANNELS, &channels) < 0)
if (ioctl(fd, SNDCTL_DSP_CHANNELS, &channels) < 0)
if (ioctl(fd, SNDCTL_DSP_CHANNELS, &channels) < 0)