Set the passed volume to all channels at the specified channel
* position. Will return the updated volume struct, or NULL if there
* is no channel at the position specified. You can check if a channel
* map includes a specific position by calling
* pa_channel_map_has_position(). Returns \a cv, or NULL on error.
* \since 0.9.16
Set the passed volume to all channels at the specified channel * position. Will return the updated volume struct, or NULL if there * is no channel at the position specified. You can check if a channel * map includes a specific position by calling * pa_channel_map_has_position(). Returns \a cv, or NULL on error. * \since 0.9.16