feeder_matrix_default_channel_map
m = feeder_matrix_default_channel_map(*arg_i);
struct pcmchan_matrix *feeder_matrix_default_channel_map(uint32_t);
m = feeder_matrix_default_channel_map(ch);
m = feeder_matrix_default_channel_map(info->channels);
m = feeder_matrix_default_channel_map(value);