ffmpeg/libavcodec/ac3enc.h

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#define AC3_FRAME_SIZE (6*256)
#define AC3_MAX_CODED_FRAME_SIZE 3840 /* in bytes */
#define AC3_MAX_CHANNELS 6
typedef struct AC3EncodeContext {
PutBitContext pb;
int nb_channels;
int nb_all_channels;
int lfe_channel;
int bit_rate;
int sample_rate;
int bsid;
int frame_size_min; /* minimum frame size in case rounding is necessary */
int frame_size; /* current frame size in words */
int halfratecod;
int frmsizecod;
int fscod; /* frequency */
int acmod;
int lfe;
int bsmod;
short last_samples[AC3_MAX_CHANNELS][256];
int chbwcod[AC3_MAX_CHANNELS];
int nb_coefs[AC3_MAX_CHANNELS];
/* bitrate allocation control */
int sgaincod, sdecaycod, fdecaycod, dbkneecod, floorcod;
int sgain, sdecay, fdecay, dbknee, floor;
int csnroffst;
int fgaincod[AC3_MAX_CHANNELS];
int fsnroffst[AC3_MAX_CHANNELS];
/* mantissa encoding */
int mant1_cnt, mant2_cnt, mant4_cnt;
} AC3EncodeContext;