hb_log( "enclame: opening libmp3lame" );
pv->lame = lame_init();
- lame_set_brate( pv->lame, audio->config.out.bitrate );
+ // use ABR
+ lame_set_VBR( pv->lame, vbr_abr );
+ lame_set_VBR_mean_bitrate_kbps( pv->lame, audio->config.out.bitrate );
lame_set_in_samplerate( pv->lame, audio->config.out.samplerate );
lame_set_out_samplerate( pv->lame, audio->config.out.samplerate );
lame_init_params( pv->lame );
+ // Lame's default encoding mode is JOINT_STEREO. This subtracts signal
+ // that is "common" to left and right (within some threshold) and encodes
+ // it separately. This improves quality at low bitrates, but hurts
+ // imaging (channel separation) at higher bitrates. So if the bitrate
+ // is suffeciently high, use regular STEREO mode.
+ if ( audio->config.out.bitrate >= 128 )
+ lame_set_mode( pv->lame, STEREO );
pv->input_samples = 1152 * 2;
pv->output_bytes = LAME_MAXMP3BUFFER;