diff options
Diffstat (limited to 'src/libac3/ac3_internal.h')
| -rw-r--r-- | src/libac3/ac3_internal.h | 334 |
1 files changed, 70 insertions, 264 deletions
diff --git a/src/libac3/ac3_internal.h b/src/libac3/ac3_internal.h index cac0c7940..50d951547 100644 --- a/src/libac3/ac3_internal.h +++ b/src/libac3/ac3_internal.h @@ -25,11 +25,6 @@ #define inline #endif -#define FAST_ERROR -#ifdef FAST_ERROR -#include <setjmp.h> -#endif - /* Exponent strategy constants */ #define EXP_REUSE (0) #define EXP_D15 (1) @@ -45,15 +40,8 @@ /* samples work structure */ typedef float stream_samples_t[6][256]; -/* global config structure */ -extern ac3_config_t ac3_config; /* global error flag */ -#ifdef FAST_ERROR -extern jmp_buf error_jmp_mark; -#define HANDLE_ERROR() longjmp (error_jmp_mark, -1) -#else extern uint32_t error_flag; -#endif /* Everything you wanted to know about band structure */ /* @@ -80,273 +68,91 @@ extern uint32_t error_flag; * conditional fields. */ -typedef struct syncinfo_s -{ - uint32_t magic; - /* Sync word == 0x0B77 */ - uint16_t syncword; - /* crc for the first 5/8 of the sync block */ - /* uint16_t crc1; */ - /* Stream Sampling Rate (kHz) 0 = 48, 1 = 44.1, 2 = 32, 3 = reserved */ - uint16_t fscod; - /* Frame size code */ - uint16_t frmsizecod; - - /* Information not in the AC-3 bitstream, but derived */ - /* Frame size in 16 bit words */ - uint16_t frame_size; - /* Bit rate in kilobits */ - uint16_t bit_rate; - /* sampling rate in hertz */ - uint32_t sampling_rate; -} syncinfo_t; - -typedef struct bsi_s -{ - uint32_t magic; - /* Bit stream identification == 0x8 */ - uint16_t bsid; - /* Bit stream mode */ - uint16_t bsmod; - /* Audio coding mode */ - uint16_t acmod; - /* If we're using the centre channel then */ - /* centre mix level */ - uint16_t cmixlev; - /* If we're using the surround channel then */ - /* surround mix level */ - uint16_t surmixlev; - /* If we're in 2/0 mode then */ - /* Dolby surround mix level - NOT USED - */ - uint16_t dsurmod; - /* Low frequency effects on */ - uint16_t lfeon; - /* Dialogue Normalization level */ - uint16_t dialnorm; - /* Compression exists */ - uint16_t compre; - /* Compression level */ - uint16_t compr; - /* Language code exists */ - uint16_t langcode; - /* Language code */ - uint16_t langcod; - /* Audio production info exists*/ - uint16_t audprodie; - uint16_t mixlevel; - uint16_t roomtyp; - /* If we're in dual mono mode (acmod == 0) then extra stuff */ - uint16_t dialnorm2; - uint16_t compr2e; - uint16_t compr2; - uint16_t langcod2e; - uint16_t langcod2; - uint16_t audprodi2e; - uint16_t mixlevel2; - uint16_t roomtyp2; - /* Copyright bit */ - uint16_t copyrightb; - /* Original bit */ - uint16_t origbs; - /* Timecode 1 exists */ - uint16_t timecod1e; - /* Timecode 1 */ - uint16_t timecod1; - /* Timecode 2 exists */ - uint16_t timecod2e; - /* Timecode 2 */ - uint16_t timecod2; - /* Additional bit stream info exists */ - uint16_t addbsie; - /* Additional bit stream length - 1 (in bytes) */ - uint16_t addbsil; - /* Additional bit stream information (max 64 bytes) */ - uint8_t addbsi[64]; - - /* Information not in the AC-3 bitstream, but derived */ - /* Number of channels (excluding LFE) - * Derived from acmod */ - uint16_t nfchans; -} bsi_t; - +typedef struct ac3_state_s { + int nfchans; // number of channels, derived from acmod + + /* from syncinfo */ + uint8_t fscod; // sample rate + + /* from bsi */ + uint8_t acmod; // coded channels + uint8_t cmixlev; // centre channel mix level + uint8_t surmixlev; // surround channels mix level + uint8_t lfeon; // coded lfe channel +} ac3_state_t; + +typedef struct ac3_ba_s { + uint16_t fsnroffst; // fine SNR offset + uint16_t fgaincod; // fast gain + uint16_t deltbae; // delta bit allocation exists + uint16_t deltnseg; // number of delta bit segments + uint16_t deltoffst[8]; // delta bit offset + uint16_t deltlen[8]; // delta bit length + uint16_t deltba[8]; // delta bit value +} ac3_ba_t; /* more pain */ -typedef struct audblk_s -{ - uint32_t magic1; - /* block switch bit indexed by channel num */ - uint16_t blksw[5]; - /* dither enable bit indexed by channel num */ - uint16_t dithflag[5]; - /* dynamic range gain exists */ - uint16_t dynrnge; - /* dynamic range gain */ - uint16_t dynrng; - /* if acmod==0 then */ - /* dynamic range 2 gain exists */ - uint16_t dynrng2e; - /* dynamic range 2 gain */ - uint16_t dynrng2; - /* coupling strategy exists */ - uint16_t cplstre; - /* coupling in use */ - uint16_t cplinu; - /* channel coupled */ - uint16_t chincpl[5]; - /* if acmod==2 then */ - /* Phase flags in use */ - uint16_t phsflginu; - /* coupling begin frequency code */ - uint16_t cplbegf; - /* coupling end frequency code */ - uint16_t cplendf; - /* coupling band structure bits */ - uint16_t cplbndstrc[18]; - /* Do coupling co-ords exist for this channel? */ - uint16_t cplcoe[5]; - /* Master coupling co-ordinate */ - uint16_t mstrcplco[5]; - /* Per coupling band coupling co-ordinates */ - uint16_t cplcoexp[5][18]; - uint16_t cplcomant[5][18]; - /* Phase flags for dual mono */ - uint16_t phsflg[18]; - /* Is there a rematrixing strategy */ - uint16_t rematstr; - /* Rematrixing bits */ - uint16_t rematflg[4]; - /* Coupling exponent strategy */ - uint16_t cplexpstr; - /* Exponent strategy for full bandwidth channels */ - uint16_t chexpstr[5]; - /* Exponent strategy for lfe channel */ - uint16_t lfeexpstr; - /* Channel bandwidth for independent channels */ - uint16_t chbwcod[5]; - /* The absolute coupling exponent */ - uint16_t cplabsexp; - /* Coupling channel exponents (D15 mode gives 18 * 12 /3 encoded exponents */ - uint16_t cplexps[18 * 12 / 3]; - /* Sanity checking constant */ - uint32_t magic2; - /* fbw channel exponents */ - uint16_t exps[5][252 / 3]; - /* channel gain range */ - uint16_t gainrng[5]; - /* low frequency exponents */ - uint16_t lfeexps[3]; - - /* Bit allocation info */ - uint16_t baie; - /* Slow decay code */ - uint16_t sdcycod; - /* Fast decay code */ - uint16_t fdcycod; - /* Slow gain code */ - uint16_t sgaincod; - /* dB per bit code */ - uint16_t dbpbcod; - /* masking floor code */ - uint16_t floorcod; - - /* SNR offset info */ - uint16_t snroffste; - /* coarse SNR offset */ - uint16_t csnroffst; - /* coupling fine SNR offset */ - uint16_t cplfsnroffst; - /* coupling fast gain code */ - uint16_t cplfgaincod; - /* fbw fine SNR offset */ - uint16_t fsnroffst[5]; - /* fbw fast gain code */ - uint16_t fgaincod[5]; - /* lfe fine SNR offset */ - uint16_t lfefsnroffst; - /* lfe fast gain code */ - uint16_t lfefgaincod; +typedef struct audblk_s { + uint32_t magic1; + + // not reused between blocks + uint16_t blksw[5]; // imdct block transform switch + uint16_t dithflag[5]; // channel dither flag + + uint16_t cplinu; // coupling in use + uint16_t chincpl[5]; // channel coupled + uint16_t phsflginu; // phase flags in use (stereo only) + uint16_t cplbegf; // coupling begin frequency code + uint16_t cplendf; // coupling end frequency code + uint16_t cplbndstrc[18]; // coupling band structure + // derived information + uint16_t cplstrtmant; // coupling channel start mantissa + uint16_t cplendmant; // coupling channel end mantissa + uint16_t ncplsubnd; // number of coupling sub-bands + uint16_t ncplbnd; // number of coupling bands + + // should we simply have float cplco[5][18] instead of these 4 ? + uint8_t mstrcplco[5]; // per channel master coupling coordinate + uint8_t cplcoexp[5][18]; // per band coupling exponent + uint8_t cplcomant[5][18]; // per band coupling mantissa + uint8_t phsflg[18]; // per band phase flags for stereo + + uint16_t rematflg[4]; // stereo rematrixing + + uint16_t chbwcod[5]; // channel bandwidth for independant channels + + uint32_t magic2; + + uint16_t sdcycod; // slow decay + uint16_t fdcycod; // fast decay + uint16_t sgaincod; // slow gain + uint16_t dbpbcod; // dB per bit - encodes the dbknee value + uint16_t floorcod; // masking floor + + uint16_t csnroffst; // coarse SNR offset + ac3_ba_t cplba; // coupling bit allocation parameters + ac3_ba_t ba[5]; // channel bit allocation parameters + ac3_ba_t lfeba; // lfe bit allocation parameters + + uint16_t cplfleak; // coupling fast leak init + uint16_t cplsleak; // coupling slow leak init - /* Coupling leak info */ - uint16_t cplleake; - /* coupling fast leak initialization */ - uint16_t cplfleak; - /* coupling slow leak initialization */ - uint16_t cplsleak; - - /* delta bit allocation info */ - uint16_t deltbaie; - /* coupling delta bit allocation exists */ - uint16_t cpldeltbae; - /* fbw delta bit allocation exists */ - uint16_t deltbae[5]; - /* number of cpl delta bit segments */ - uint16_t cpldeltnseg; - /* coupling delta bit allocation offset */ - uint16_t cpldeltoffst[8]; - /* coupling delta bit allocation length */ - uint16_t cpldeltlen[8]; - /* coupling delta bit allocation length */ - uint16_t cpldeltba[8]; - /* number of delta bit segments */ - uint16_t deltnseg[5]; - /* fbw delta bit allocation offset */ - uint16_t deltoffst[5][8]; - /* fbw delta bit allocation length */ - uint16_t deltlen[5][8]; - /* fbw delta bit allocation length */ - uint16_t deltba[5][8]; - - /* skip length exists */ - uint16_t skiple; - /* skip length */ - uint16_t skipl; - //Removed Feb 2000 -ah - //added Jul 2000 ++dent - /* channel mantissas */ - uint16_t chmant[5][256]; - - /* coupling mantissas */ -// uint16_t cplmant[256]; - //Added Jun 2000 -MaXX - /* coupling floats */ - float cpl_flt[ 256 ]; - //Removed Feb 2000 -ah - //added Jul 2000 ++dent /* coupling mantissas */ - uint16_t lfemant[7]; + uint16_t cplmant[256]; /* -- Information not in the bitstream, but derived thereof -- */ - /* Number of coupling sub-bands */ - uint16_t ncplsubnd; - - /* Number of combined coupling sub-bands - * Derived from ncplsubnd and cplbndstrc */ - uint16_t ncplbnd; - - /* Number of exponent groups by channel - * Derived from strmant, endmant */ - uint16_t nchgrps[5]; - - /* Number of coupling exponent groups - * Derived from cplbegf, cplendf, cplexpstr */ - uint16_t ncplgrps; - /* End mantissa numbers of fbw channels */ uint16_t endmant[5]; - /* Start and end mantissa numbers for the coupling channel */ - uint16_t cplstrtmant; - uint16_t cplendmant; - /* Decoded exponent info */ - uint16_t fbw_exp[5][256]; - uint16_t cpl_exp[256]; - uint16_t lfe_exp[7]; + uint8_t fbw_exp[5][256]; + uint8_t cpl_exp[256]; + uint8_t lfe_exp[7]; /* Bit allocation pointer results */ uint16_t fbw_bap[5][256]; |