ff_mov_write_chan  152 libavformat/aiffenc.c         ff_mov_write_chan(pb, enc->channel_layout);
ff_mov_write_chan  168 libavformat/cafenc.c         ff_mov_write_chan(pb, enc->channel_layout);
ff_mov_write_chan  265 libavformat/isom.h void ff_mov_write_chan(AVIOContext *pb, int64_t channel_layout);