FFmpeg/libavcodec/mpegaudio.h

/* mpeg audio declarations for both encoder and decoder */

/* max frame size, in samples */
#define MPA_FRAME_SIZE 1152 

/* max compressed frame size */
#define MPA_MAX_CODED_FRAME_SIZE 1792

#define MPA_MAX_CHANNELS 2

#define SBLIMIT 32 /* number of subbands */

#define MPA_STEREO  0
#define MPA_JSTEREO 1
#define MPA_DUAL    2
#define MPA_MONO    3

int l2_select_table(int bitrate, int nb_channels, int freq, int lsf);

extern const UINT16 mpa_bitrate_tab[2][3][15];
extern const UINT16 mpa_freq_tab[3];
extern const unsigned char *alloc_tables[5];
extern const double enwindow[512];
extern const int sblimit_table[5];
extern const int quant_steps[17];
extern const int quant_bits[17];
extern const INT32 mpa_enwindow[257];