Private info for specified board
Channel whose sample size will be adjusted
New sample size, use the AFMT_xxx constants
Helper function for the SNDCTL_DSP_SETFMT ioctl. OSS semantics demand that all audio operations halt (if they are not already halted) when the SNDCTL_DSP_SETFMT is given.
This function halts all audio operations for the given channel chan, and then calls via_chan_pcm_fmt to set the audio hardware to the new sample size, either 8-bit or 16-bit.