ac3enc.h Source File

00001 
00002 #define AC3_FRAME_SIZE (6*256)
00003 #define AC3_MAX_CODED_FRAME_SIZE 3840 /* in bytes */
00004 #define AC3_MAX_CHANNELS 6
00005 
00006 typedef struct AC3EncodeContext {
00007     PutBitContext pb;
00008     int nb_channels;
00009     int nb_all_channels;
00010     int lfe_channel;
00011     int bit_rate;
00012     int sample_rate;
00013     int bsid;
00014     int frame_size_min; /* minimum frame size in case rounding is necessary */
00015     int frame_size; /* current frame size in words */
00016     int halfratecod;
00017     int frmsizecod;
00018     int fscod; /* frequency */
00019     int acmod;
00020     int lfe;
00021     int bsmod;
00022     short last_samples[AC3_MAX_CHANNELS][256];
00023     int chbwcod[AC3_MAX_CHANNELS];
00024     int nb_coefs[AC3_MAX_CHANNELS];
00025     
00026     /* bitrate allocation control */
00027     int sgaincod, sdecaycod, fdecaycod, dbkneecod, floorcod; 
00028     int sgain, sdecay, fdecay, dbknee, floor;
00029     int csnroffst;
00030     int fgaincod[AC3_MAX_CHANNELS];
00031     int fsnroffst[AC3_MAX_CHANNELS];
00032     /* mantissa encoding */
00033     int mant1_cnt, mant2_cnt, mant4_cnt;
00034 } AC3EncodeContext;