card
Private info for specified board
chan
Channel whose sample rate will be adjusted
val
New sample rate, in Khz
Helper function for the SNDCTL_DSP_SPEED
ioctl. OSS semantics
demand that all audio operations halt (if they are not already
halted) when the SNDCTL_DSP_SPEED
is given.
This function halts all audio operations for the given channel
chan
, and then calls via_set_rate to set the audio hardware
to the new rate.