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-
- #define AC3_FRAME_SIZE (6*256)
- #define AC3_MAX_CODED_FRAME_SIZE 3840 /* in bytes */
- #define AC3_MAX_CHANNELS 2 /* we handle at most two channels, although
- AC3 allows 6 channels */
-
- typedef struct AC3EncodeContext {
- PutBitContext pb;
- int nb_channels;
- 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 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;
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