Looking at the API of libmp3lame, all the functions:
1- Either take left and right channels, like this one:
int CDECL lame_encode_buffer (
lame_global_flags* gfp, /* global context handle */
const short int buffer_l [], /* PCM data for left channel */
const short int buffer_r [], /* PCM data for right channel */
const int nsamples, /* number of samples per channel */
unsigned char* mp3buf, /* pointer to encoded MP3 stream */
const int mp3buf_size ); /* number of valid octets in this
stream */
2- Take interleaved data, like this one:
int CDECL lame_encode_buffer_interleaved(
lame_global_flags* gfp, /* global context handlei */
short int pcm[], /* PCM data for left and right
channel, interleaved */
int num_samples, /* number of samples per channel,
_not_ number of samples in
pcm[] */
unsigned char* mp3buf, /* pointer to encoded MP3 stream */
int mp3buf_size ); /* number of valid octets in this
stream */
This is the case, although one can choose MONO instead of stereo. Using:
lame_set_mode(lame,MPEG_mode_e::MONO);
But then how can I get libmp3lame to take MONO PCM data and encode mono mp3 audio? What's the right API to use for that if I don't have a second channel?
