avcodec_guess_channel_layout  126 libavcodec/audioconvert.c         channel_layout = avcodec_guess_channel_layout(nb_channels, CODEC_ID_NONE, NULL);
avcodec_guess_channel_layout   74 libavcodec/audioconvert.h int64_t avcodec_guess_channel_layout(int nb_channels, enum CodecID codec_id, const char *fmt_name);