MPA_MONO           67 libavcodec/mpegaudiodecheader.c     if (s->mode == MPA_MONO)
MPA_MONO          624 libavcodec/mpegaudioenc_template.c     put_bits(p, 2, s->nb_channels == 2 ? MPA_STEREO : MPA_MONO);
MPA_MONO          165 libavformat/mp3enc.c     case 1:  channels = MPA_MONO;                                          break;