diff --git a/liba52/a52.h b/liba52/a52.h new file mode 100644 index 0000000000..bf63fc68d6 --- /dev/null +++ b/liba52/a52.h @@ -0,0 +1,122 @@ +/* + * a52.h + * Copyright (C) 2000-2001 Michel Lespinasse + * Copyright (C) 1999-2000 Aaron Holtzman + * + * This file is part of a52dec, a free ATSC A-52 stream decoder. + * See http://liba52.sourceforge.net/ for updates. + * + * a52dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * a52dec is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef A52_H +#define A52_H + +#ifndef LIBA52_DOUBLE +typedef float sample_t; +#else +typedef double sample_t; +#endif + +typedef struct a52_ba_s { + uint16_t fsnroffst; /* fine SNR offset */ + uint16_t fgaincod; /* fast gain */ + uint16_t deltbae; /* delta bit allocation exists */ + int8_t deltba[50]; /* per-band delta bit allocation */ +} a52_ba_t; + +typedef struct a52_state_s { + uint8_t fscod; /* sample rate */ + uint8_t halfrate; /* halfrate factor */ + uint8_t acmod; /* coded channels */ + sample_t clev; /* centre channel mix level */ + sample_t slev; /* surround channels mix level */ + uint8_t lfeon; /* coded lfe channel */ + + int output; /* type of output */ + sample_t level; /* output level */ + sample_t bias; /* output bias */ + + int dynrnge; /* apply dynamic range */ + sample_t dynrng; /* dynamic range */ + void * dynrngdata; /* dynamic range callback funtion and data */ + sample_t (* dynrngcall) (sample_t range, void * dynrngdata); + + uint16_t cplinu; /* coupling in use */ + uint16_t chincpl[5]; /* channel coupled */ + uint16_t phsflginu; /* phase flags in use (stereo only) */ + uint16_t cplbndstrc[18]; /* coupling band structure */ + uint16_t cplstrtmant; /* coupling channel start mantissa */ + uint16_t cplendmant; /* coupling channel end mantissa */ + sample_t cplco[5][18]; /* coupling coordinates */ + + /* derived information */ + uint16_t cplstrtbnd; /* coupling start band (for bit allocation) */ + uint16_t ncplbnd; /* number of coupling bands */ + + uint16_t rematflg[4]; /* stereo rematrixing */ + + uint16_t endmant[5]; /* channel end mantissa */ + + uint8_t cpl_exp[256]; /* decoded coupling channel exponents */ + uint8_t fbw_exp[5][256]; /* decoded channel exponents */ + uint8_t lfe_exp[7]; /* decoded lfe channel exponents */ + + 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 */ + a52_ba_t cplba; /* coupling bit allocation parameters */ + a52_ba_t ba[5]; /* channel bit allocation parameters */ + a52_ba_t lfeba; /* lfe bit allocation parameters */ + + uint16_t cplfleak; /* coupling fast leak init */ + uint16_t cplsleak; /* coupling slow leak init */ + + /* derived bit allocation information */ + int8_t fbw_bap[5][256]; + int8_t cpl_bap[256]; + int8_t lfe_bap[7]; +} a52_state_t; + +#define A52_CHANNEL 0 +#define A52_MONO 1 +#define A52_STEREO 2 +#define A52_3F 3 +#define A52_2F1R 4 +#define A52_3F1R 5 +#define A52_2F2R 6 +#define A52_3F2R 7 +#define A52_CHANNEL1 8 +#define A52_CHANNEL2 9 +#define A52_DOLBY 10 +#define A52_CHANNEL_MASK 15 + +#define A52_LFE 16 +#define A52_ADJUST_LEVEL 32 + +sample_t * a52_init (uint32_t mm_accel); +int a52_syncinfo (uint8_t * buf, int * flags, + int * sample_rate, int * bit_rate); +int a52_frame (a52_state_t * state, uint8_t * buf, int * flags, + sample_t * level, sample_t bias); +void a52_dynrng (a52_state_t * state, + sample_t (* call) (sample_t, void *), void * data); +int a52_block (a52_state_t * state, sample_t * samples); + +#endif /* A52_H */ diff --git a/liba52/a52_internal.h b/liba52/a52_internal.h new file mode 100644 index 0000000000..e26115d349 --- /dev/null +++ b/liba52/a52_internal.h @@ -0,0 +1,56 @@ +/* + * a52_internal.h + * Copyright (C) 2000-2001 Michel Lespinasse + * Copyright (C) 1999-2000 Aaron Holtzman + * + * This file is part of a52dec, a free ATSC A-52 stream decoder. + * See http://liba52.sourceforge.net/ for updates. + * + * a52dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * a52dec is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#define LEVEL_PLUS6DB 2.0 +#define LEVEL_PLUS3DB 1.4142135623730951 +#define LEVEL_3DB 0.7071067811865476 +#define LEVEL_45DB 0.5946035575013605 +#define LEVEL_6DB 0.5 + +#define EXP_REUSE (0) +#define EXP_D15 (1) +#define EXP_D25 (2) +#define EXP_D45 (3) + +#define DELTA_BIT_REUSE (0) +#define DELTA_BIT_NEW (1) +#define DELTA_BIT_NONE (2) +#define DELTA_BIT_RESERVED (3) + +void bit_allocate (a52_state_t * state, a52_ba_t * ba, int bndstart, + int start, int end, int fastleak, int slowleak, + uint8_t * exp, int8_t * bap); + +int downmix_init (int input, int flags, sample_t * level, + sample_t clev, sample_t slev); +int downmix_coeff (sample_t * coeff, int acmod, int output, sample_t level, + sample_t clev, sample_t slev); +void downmix (sample_t * samples, int acmod, int output, sample_t bias, + sample_t clev, sample_t slev); +void upmix (sample_t * samples, int acmod, int output); + +void imdct_init (uint32_t mm_accel); +extern void (* imdct_256) (sample_t * data, sample_t * delay, sample_t bias); +extern void (* imdct_512) (sample_t * data, sample_t * delay, sample_t bias); +void imdct_do_256_mlib (sample_t * data, sample_t * delay, sample_t bias); +void imdct_do_512_mlib (sample_t * data, sample_t * delay, sample_t bias); diff --git a/liba52/bit_allocate.c b/liba52/bit_allocate.c new file mode 100644 index 0000000000..d0dd602156 --- /dev/null +++ b/liba52/bit_allocate.c @@ -0,0 +1,260 @@ +/* + * bit_allocate.c + * Copyright (C) 2000-2001 Michel Lespinasse + * Copyright (C) 1999-2000 Aaron Holtzman + * + * This file is part of a52dec, a free ATSC A-52 stream decoder. + * See http://liba52.sourceforge.net/ for updates. + * + * a52dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * a52dec is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "config.h" + +#include + +#include "a52.h" +#include "a52_internal.h" + +static int hthtab[3][50] = { + {0x730, 0x730, 0x7c0, 0x800, 0x820, 0x840, 0x850, 0x850, 0x860, 0x860, + 0x860, 0x860, 0x860, 0x870, 0x870, 0x870, 0x880, 0x880, 0x890, 0x890, + 0x8a0, 0x8a0, 0x8b0, 0x8b0, 0x8c0, 0x8c0, 0x8d0, 0x8e0, 0x8f0, 0x900, + 0x910, 0x910, 0x910, 0x910, 0x900, 0x8f0, 0x8c0, 0x870, 0x820, 0x7e0, + 0x7a0, 0x770, 0x760, 0x7a0, 0x7c0, 0x7c0, 0x6e0, 0x400, 0x3c0, 0x3c0}, + {0x710, 0x710, 0x7a0, 0x7f0, 0x820, 0x830, 0x840, 0x850, 0x850, 0x860, + 0x860, 0x860, 0x860, 0x860, 0x870, 0x870, 0x870, 0x880, 0x880, 0x880, + 0x890, 0x890, 0x8a0, 0x8a0, 0x8b0, 0x8b0, 0x8c0, 0x8c0, 0x8e0, 0x8f0, + 0x900, 0x910, 0x910, 0x910, 0x910, 0x900, 0x8e0, 0x8b0, 0x870, 0x820, + 0x7e0, 0x7b0, 0x760, 0x770, 0x7a0, 0x7c0, 0x780, 0x5d0, 0x3c0, 0x3c0}, + {0x680, 0x680, 0x750, 0x7b0, 0x7e0, 0x810, 0x820, 0x830, 0x840, 0x850, + 0x850, 0x850, 0x860, 0x860, 0x860, 0x860, 0x860, 0x860, 0x860, 0x860, + 0x870, 0x870, 0x870, 0x870, 0x880, 0x880, 0x880, 0x890, 0x8a0, 0x8b0, + 0x8c0, 0x8d0, 0x8e0, 0x8f0, 0x900, 0x910, 0x910, 0x910, 0x900, 0x8f0, + 0x8d0, 0x8b0, 0x840, 0x7f0, 0x790, 0x760, 0x7a0, 0x7c0, 0x7b0, 0x720} +}; + +static int8_t baptab[305] = { + 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, + 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, + 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, + 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, + 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, + 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, /* 93 padding elems */ + + 16, 16, 16, 16, 16, 16, 16, 16, 16, 14, 14, 14, 14, 14, 14, 14, + 14, 12, 12, 12, 12, 11, 11, 11, 11, 10, 10, 10, 10, 9, 9, 9, + 9, 8, 8, 8, 8, 7, 7, 7, 7, 6, 6, 6, 6, 5, 5, 5, + 5, 4, 4, -3, -3, 3, 3, 3, -2, -2, -1, -1, -1, -1, -1, 0, + + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0 /* 148 padding elems */ +}; + +static int bndtab[30] = {21, 22, 23, 24, 25, 26, 27, 28, 31, 34, + 37, 40, 43, 46, 49, 55, 61, 67, 73, 79, + 85, 97, 109, 121, 133, 157, 181, 205, 229, 253}; + +static int8_t latab[256] = { + -64, -63, -62, -61, -60, -59, -58, -57, -56, -55, -54, -53, + -52, -52, -51, -50, -49, -48, -47, -47, -46, -45, -44, -44, + -43, -42, -41, -41, -40, -39, -38, -38, -37, -36, -36, -35, + -35, -34, -33, -33, -32, -32, -31, -30, -30, -29, -29, -28, + -28, -27, -27, -26, -26, -25, -25, -24, -24, -23, -23, -22, + -22, -21, -21, -21, -20, -20, -19, -19, -19, -18, -18, -18, + -17, -17, -17, -16, -16, -16, -15, -15, -15, -14, -14, -14, + -13, -13, -13, -13, -12, -12, -12, -12, -11, -11, -11, -11, + -10, -10, -10, -10, -10, -9, -9, -9, -9, -9, -8, -8, + -8, -8, -8, -8, -7, -7, -7, -7, -7, -7, -6, -6, + -6, -6, -6, -6, -6, -6, -5, -5, -5, -5, -5, -5, + -5, -5, -4, -4, -4, -4, -4, -4, -4, -4, -4, -4, + -4, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, -3, + -3, -3, -3, -2, -2, -2, -2, -2, -2, -2, -2, -2, + -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, + -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0 +}; + +#define UPDATE_LEAK() \ +do { \ + fastleak += fdecay; \ + if (fastleak > psd + fgain) \ + fastleak = psd + fgain; \ + slowleak += sdecay; \ + if (slowleak > psd + sgain) \ + slowleak = psd + sgain; \ +} while (0) + +#define COMPUTE_MASK() \ +do { \ + if (psd > dbknee) \ + mask -= (psd - dbknee) >> 2; \ + if (mask > hth [i >> halfrate]) \ + mask = hth [i >> halfrate]; \ + mask -= snroffset + 128 * deltba[i]; \ + mask = (mask > 0) ? 0 : ((-mask) >> 5); \ + mask -= floor; \ +} while (0) + +void bit_allocate (a52_state_t * state, a52_ba_t * ba, int bndstart, + int start, int end, int fastleak, int slowleak, + uint8_t * exp, int8_t * bap) +{ + static int slowgain[4] = {0x540, 0x4d8, 0x478, 0x410}; + static int dbpbtab[4] = {0xc00, 0x500, 0x300, 0x100}; + static int floortab[8] = {0x910, 0x950, 0x990, 0x9d0, + 0xa10, 0xa90, 0xb10, 0x1400}; + + int i, j; + int fdecay, fgain, sdecay, sgain, dbknee, floor, snroffset; + int psd, mask; + int8_t * deltba; + int * hth; + int halfrate; + + halfrate = state->halfrate; + fdecay = (63 + 20 * state->fdcycod) >> halfrate; + fgain = 128 + 128 * ba->fgaincod; + sdecay = (15 + 2 * state->sdcycod) >> halfrate; + sgain = slowgain[state->sgaincod]; + dbknee = dbpbtab[state->dbpbcod]; + hth = hthtab[state->fscod]; + /* + * if there is no delta bit allocation, make deltba point to an area + * known to contain zeroes. baptab+156 here. + */ + deltba = (ba->deltbae == DELTA_BIT_NONE) ? baptab + 156 : ba->deltba; + floor = floortab[state->floorcod]; + snroffset = 960 - 64 * state->csnroffst - 4 * ba->fsnroffst + floor; + floor >>= 5; + + i = bndstart; + j = start; + if (start == 0) { /* not the coupling channel */ + int lowcomp; + + lowcomp = 0; + j = end - 1; + do { + if (i < j) { + if (exp[i+1] == exp[i] - 2) + lowcomp = 384; + else if (lowcomp && (exp[i+1] > exp[i])) + lowcomp -= 64; + } + psd = 128 * exp[i]; + mask = psd + fgain + lowcomp; + COMPUTE_MASK (); + bap[i] = (baptab+156)[mask + 4 * exp[i]]; + i++; + } while ((i < 3) || ((i < 7) && (exp[i] > exp[i-1]))); + fastleak = psd + fgain; + slowleak = psd + sgain; + + while (i < 7) { + if (i < j) { + if (exp[i+1] == exp[i] - 2) + lowcomp = 384; + else if (lowcomp && (exp[i+1] > exp[i])) + lowcomp -= 64; + } + psd = 128 * exp[i]; + UPDATE_LEAK (); + mask = ((fastleak + lowcomp < slowleak) ? + fastleak + lowcomp : slowleak); + COMPUTE_MASK (); + bap[i] = (baptab+156)[mask + 4 * exp[i]]; + i++; + } + + if (end == 7) /* lfe channel */ + return; + + do { + if (exp[i+1] == exp[i] - 2) + lowcomp = 320; + else if (lowcomp && (exp[i+1] > exp[i])) + lowcomp -= 64; + psd = 128 * exp[i]; + UPDATE_LEAK (); + mask = ((fastleak + lowcomp < slowleak) ? + fastleak + lowcomp : slowleak); + COMPUTE_MASK (); + bap[i] = (baptab+156)[mask + 4 * exp[i]]; + i++; + } while (i < 20); + + while (lowcomp > 128) { /* two iterations maximum */ + lowcomp -= 128; + psd = 128 * exp[i]; + UPDATE_LEAK (); + mask = ((fastleak + lowcomp < slowleak) ? + fastleak + lowcomp : slowleak); + COMPUTE_MASK (); + bap[i] = (baptab+156)[mask + 4 * exp[i]]; + i++; + } + j = i; + } + + do { + int startband, endband; + + startband = j; + endband = ((bndtab-20)[i] < end) ? (bndtab-20)[i] : end; + psd = 128 * exp[j++]; + while (j < endband) { + int next, delta; + + next = 128 * exp[j++]; + delta = next - psd; + switch (delta >> 9) { + case -6: case -5: case -4: case -3: case -2: + psd = next; + break; + case -1: + psd = next + latab[(-delta) >> 1]; + break; + case 0: + psd += latab[delta >> 1]; + break; + } + } + /* minpsd = -289 */ + UPDATE_LEAK (); + mask = (fastleak < slowleak) ? fastleak : slowleak; + COMPUTE_MASK (); + i++; + j = startband; + do { + /* max(mask+4*exp)=147=-(minpsd+fgain-deltba-snroffset)>>5+4*exp */ + /* min(mask+4*exp)=-156=-(sgain-deltba-snroffset)>>5 */ + bap[j] = (baptab+156)[mask + 4 * exp[j]]; + } while (++j < endband); + } while (j < end); +} diff --git a/liba52/bitstream.c b/liba52/bitstream.c new file mode 100644 index 0000000000..0a48cab2c4 --- /dev/null +++ b/liba52/bitstream.c @@ -0,0 +1,101 @@ +/* + * bitstream.c + * Copyright (C) 2000-2001 Michel Lespinasse + * Copyright (C) 1999-2000 Aaron Holtzman + * + * This file is part of a52dec, a free ATSC A-52 stream decoder. + * See http://liba52.sourceforge.net/ for updates. + * + * a52dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * a52dec is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "config.h" + +#include + +#include "a52.h" +#include "a52_internal.h" +#include "bitstream.h" + +#define BUFFER_SIZE 4096 + +static uint32_t * buffer_start; + +uint32_t bits_left; +uint32_t current_word; + +void bitstream_set_ptr (uint8_t * buf) +{ + int align; + + align = (int)buf & 3; + buffer_start = (uint32_t *) (buf - align); + bits_left = 0; + bitstream_get (align * 8); +} + +static inline void +bitstream_fill_current() +{ + uint32_t tmp; + + tmp = *(buffer_start++); + current_word = swab32 (tmp); +} + +/* + * The fast paths for _get is in the + * bitstream.h header file so it can be inlined. + * + * The "bottom half" of this routine is suffixed _bh + * + * -ah + */ + +uint32_t +bitstream_get_bh(uint32_t num_bits) +{ + uint32_t result; + + num_bits -= bits_left; + result = (current_word << (32 - bits_left)) >> (32 - bits_left); + + bitstream_fill_current(); + + if(num_bits != 0) + result = (result << num_bits) | (current_word >> (32 - num_bits)); + + bits_left = 32 - num_bits; + + return result; +} + +int32_t +bitstream_get_bh_2(uint32_t num_bits) +{ + int32_t result; + + num_bits -= bits_left; + result = (((int32_t)current_word) << (32 - bits_left)) >> (32 - bits_left); + + bitstream_fill_current(); + + if(num_bits != 0) + result = (result << num_bits) | (current_word >> (32 - num_bits)); + + bits_left = 32 - num_bits; + + return result; +} diff --git a/liba52/bitstream.h b/liba52/bitstream.h new file mode 100644 index 0000000000..0be249e1f2 --- /dev/null +++ b/liba52/bitstream.h @@ -0,0 +1,82 @@ +/* + * bitstream.h + * Copyright (C) 2000-2001 Michel Lespinasse + * Copyright (C) 1999-2000 Aaron Holtzman + * + * This file is part of a52dec, a free ATSC A-52 stream decoder. + * See http://liba52.sourceforge.net/ for updates. + * + * a52dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * a52dec is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +/* (stolen from the kernel) */ +#ifdef WORDS_BIGENDIAN + +# define swab32(x) (x) + +#else + +# if defined (__i386__) + +# define swab32(x) __i386_swab32(x) + static inline const uint32_t __i386_swab32(uint32_t x) + { + __asm__("bswap %0" : "=r" (x) : "0" (x)); + return x; + } + +# else + +# define swab32(x)\ +((((uint8_t*)&x)[0] << 24) | (((uint8_t*)&x)[1] << 16) | \ + (((uint8_t*)&x)[2] << 8) | (((uint8_t*)&x)[3])) + +# endif +#endif + +extern uint32_t bits_left; +extern uint32_t current_word; + +void bitstream_set_ptr (uint8_t * buf); +uint32_t bitstream_get_bh(uint32_t num_bits); +int32_t bitstream_get_bh_2(uint32_t num_bits); + +static inline uint32_t +bitstream_get(uint32_t num_bits) +{ + uint32_t result; + + if(num_bits < bits_left) { + result = (current_word << (32 - bits_left)) >> (32 - num_bits); + bits_left -= num_bits; + return result; + } + + return bitstream_get_bh(num_bits); +} + +static inline int32_t +bitstream_get_2(uint32_t num_bits) +{ + int32_t result; + + if(num_bits < bits_left) { + result = (((int32_t)current_word) << (32 - bits_left)) >> (32 - num_bits); + bits_left -= num_bits; + return result; + } + + return bitstream_get_bh_2(num_bits); +} diff --git a/liba52/downmix.c b/liba52/downmix.c new file mode 100644 index 0000000000..8010cd4c61 --- /dev/null +++ b/liba52/downmix.c @@ -0,0 +1,655 @@ +/* + * downmix.c + * Copyright (C) 2000-2001 Michel Lespinasse + * Copyright (C) 1999-2000 Aaron Holtzman + * + * This file is part of a52dec, a free ATSC A-52 stream decoder. + * See http://liba52.sourceforge.net/ for updates. + * + * a52dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * a52dec is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "config.h" + +#include +#include + +#include "a52.h" +#include "a52_internal.h" + +#define CONVERT(acmod,output) (((output) << 3) + (acmod)) + +int downmix_init (int input, int flags, sample_t * level, + sample_t clev, sample_t slev) +{ + static uint8_t table[11][8] = { + {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO, + A52_STEREO, A52_STEREO, A52_STEREO, A52_STEREO}, + {A52_MONO, A52_MONO, A52_MONO, A52_MONO, + A52_MONO, A52_MONO, A52_MONO, A52_MONO}, + {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO, + A52_STEREO, A52_STEREO, A52_STEREO, A52_STEREO}, + {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_3F, + A52_STEREO, A52_3F, A52_STEREO, A52_3F}, + {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO, + A52_2F1R, A52_2F1R, A52_2F1R, A52_2F1R}, + {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_STEREO, + A52_2F1R, A52_3F1R, A52_2F1R, A52_3F1R}, + {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_3F, + A52_2F2R, A52_2F2R, A52_2F2R, A52_2F2R}, + {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_3F, + A52_2F2R, A52_3F2R, A52_2F2R, A52_3F2R}, + {A52_CHANNEL1, A52_MONO, A52_MONO, A52_MONO, + A52_MONO, A52_MONO, A52_MONO, A52_MONO}, + {A52_CHANNEL2, A52_MONO, A52_MONO, A52_MONO, + A52_MONO, A52_MONO, A52_MONO, A52_MONO}, + {A52_CHANNEL, A52_DOLBY, A52_STEREO, A52_DOLBY, + A52_DOLBY, A52_DOLBY, A52_DOLBY, A52_DOLBY} + }; + int output; + + output = flags & A52_CHANNEL_MASK; + if (output > A52_DOLBY) + return -1; + + output = table[output][input & 7]; + + if ((output == A52_STEREO) && + ((input == A52_DOLBY) || ((input == A52_3F) && (clev == LEVEL_3DB)))) + output = A52_DOLBY; + + if (flags & A52_ADJUST_LEVEL) + switch (CONVERT (input & 7, output)) { + + case CONVERT (A52_3F, A52_MONO): + *level *= LEVEL_3DB / (1 + clev); + break; + + case CONVERT (A52_STEREO, A52_MONO): + case CONVERT (A52_2F2R, A52_2F1R): + case CONVERT (A52_3F2R, A52_3F1R): + level_3db: + *level *= LEVEL_3DB; + break; + + case CONVERT (A52_3F2R, A52_2F1R): + if (clev < LEVEL_PLUS3DB - 1) + goto level_3db; + /* break thru */ + case CONVERT (A52_3F, A52_STEREO): + case CONVERT (A52_3F1R, A52_2F1R): + case CONVERT (A52_3F1R, A52_2F2R): + case CONVERT (A52_3F2R, A52_2F2R): + *level /= 1 + clev; + break; + + case CONVERT (A52_2F1R, A52_MONO): + *level *= LEVEL_PLUS3DB / (2 + slev); + break; + + case CONVERT (A52_2F1R, A52_STEREO): + case CONVERT (A52_3F1R, A52_3F): + *level /= 1 + slev * LEVEL_3DB; + break; + + case CONVERT (A52_3F1R, A52_MONO): + *level *= LEVEL_3DB / (1 + clev + 0.5 * slev); + break; + + case CONVERT (A52_3F1R, A52_STEREO): + *level /= 1 + clev + slev * LEVEL_3DB; + break; + + case CONVERT (A52_2F2R, A52_MONO): + *level *= LEVEL_3DB / (1 + slev); + break; + + case CONVERT (A52_2F2R, A52_STEREO): + case CONVERT (A52_3F2R, A52_3F): + *level /= 1 + slev; + break; + + case CONVERT (A52_3F2R, A52_MONO): + *level *= LEVEL_3DB / (1 + clev + slev); + break; + + case CONVERT (A52_3F2R, A52_STEREO): + *level /= 1 + clev + slev; + break; + + case CONVERT (A52_MONO, A52_DOLBY): + *level *= LEVEL_PLUS3DB; + break; + + case CONVERT (A52_3F, A52_DOLBY): + case CONVERT (A52_2F1R, A52_DOLBY): + *level *= 1 / (1 + LEVEL_3DB); + break; + + case CONVERT (A52_3F1R, A52_DOLBY): + case CONVERT (A52_2F2R, A52_DOLBY): + *level *= 1 / (1 + 2 * LEVEL_3DB); + break; + + case CONVERT (A52_3F2R, A52_DOLBY): + *level *= 1 / (1 + 3 * LEVEL_3DB); + break; + } + + return output; +} + +int downmix_coeff (sample_t * coeff, int acmod, int output, sample_t level, + sample_t clev, sample_t slev) +{ + switch (CONVERT (acmod, output & A52_CHANNEL_MASK)) { + + case CONVERT (A52_CHANNEL, A52_CHANNEL): + case CONVERT (A52_MONO, A52_MONO): + case CONVERT (A52_STEREO, A52_STEREO): + case CONVERT (A52_3F, A52_3F): + case CONVERT (A52_2F1R, A52_2F1R): + case CONVERT (A52_3F1R, A52_3F1R): + case CONVERT (A52_2F2R, A52_2F2R): + case CONVERT (A52_3F2R, A52_3F2R): + case CONVERT (A52_STEREO, A52_DOLBY): + coeff[0] = coeff[1] = coeff[2] = coeff[3] = coeff[4] = level; + return 0; + + case CONVERT (A52_CHANNEL, A52_MONO): + coeff[0] = coeff[1] = level * LEVEL_6DB; + return 3; + + case CONVERT (A52_STEREO, A52_MONO): + coeff[0] = coeff[1] = level * LEVEL_3DB; + return 3; + + case CONVERT (A52_3F, A52_MONO): + coeff[0] = coeff[2] = level * LEVEL_3DB; + coeff[1] = level * clev * LEVEL_PLUS3DB; + return 7; + + case CONVERT (A52_2F1R, A52_MONO): + coeff[0] = coeff[1] = level * LEVEL_3DB; + coeff[2] = level * slev * LEVEL_3DB; + return 7; + + case CONVERT (A52_2F2R, A52_MONO): + coeff[0] = coeff[1] = level * LEVEL_3DB; + coeff[2] = coeff[3] = level * slev * LEVEL_3DB; + return 15; + + case CONVERT (A52_3F1R, A52_MONO): + coeff[0] = coeff[2] = level * LEVEL_3DB; + coeff[1] = level * clev * LEVEL_PLUS3DB; + coeff[3] = level * slev * LEVEL_3DB; + return 15; + + case CONVERT (A52_3F2R, A52_MONO): + coeff[0] = coeff[2] = level * LEVEL_3DB; + coeff[1] = level * clev * LEVEL_PLUS3DB; + coeff[3] = coeff[4] = level * slev * LEVEL_3DB; + return 31; + + case CONVERT (A52_MONO, A52_DOLBY): + coeff[0] = level * LEVEL_3DB; + return 0; + + case CONVERT (A52_3F, A52_DOLBY): + clev = LEVEL_3DB; + case CONVERT (A52_3F, A52_STEREO): + case CONVERT (A52_3F1R, A52_2F1R): + case CONVERT (A52_3F2R, A52_2F2R): + coeff[0] = coeff[2] = coeff[3] = coeff[4] = level; + coeff[1] = level * clev; + return 7; + + case CONVERT (A52_2F1R, A52_DOLBY): + slev = 1; + case CONVERT (A52_2F1R, A52_STEREO): + coeff[0] = coeff[1] = level; + coeff[2] = level * slev * LEVEL_3DB; + return 7; + + case CONVERT (A52_3F1R, A52_DOLBY): + clev = LEVEL_3DB; + slev = 1; + case CONVERT (A52_3F1R, A52_STEREO): + coeff[0] = coeff[2] = level; + coeff[1] = level * clev; + coeff[3] = level * slev * LEVEL_3DB; + return 15; + + case CONVERT (A52_2F2R, A52_DOLBY): + slev = LEVEL_3DB; + case CONVERT (A52_2F2R, A52_STEREO): + coeff[0] = coeff[1] = level; + coeff[2] = coeff[3] = level * slev; + return 15; + + case CONVERT (A52_3F2R, A52_DOLBY): + clev = LEVEL_3DB; + case CONVERT (A52_3F2R, A52_2F1R): + slev = LEVEL_3DB; + case CONVERT (A52_3F2R, A52_STEREO): + coeff[0] = coeff[2] = level; + coeff[1] = level * clev; + coeff[3] = coeff[4] = level * slev; + return 31; + + case CONVERT (A52_3F1R, A52_3F): + coeff[0] = coeff[1] = coeff[2] = level; + coeff[3] = level * slev * LEVEL_3DB; + return 13; + + case CONVERT (A52_3F2R, A52_3F): + coeff[0] = coeff[1] = coeff[2] = level; + coeff[3] = coeff[4] = level * slev; + return 29; + + case CONVERT (A52_2F2R, A52_2F1R): + coeff[0] = coeff[1] = level; + coeff[2] = coeff[3] = level * LEVEL_3DB; + return 12; + + case CONVERT (A52_3F2R, A52_3F1R): + coeff[0] = coeff[1] = coeff[2] = level; + coeff[3] = coeff[4] = level * LEVEL_3DB; + return 24; + + case CONVERT (A52_2F1R, A52_2F2R): + coeff[0] = coeff[1] = level; + coeff[2] = level * LEVEL_3DB; + return 0; + + case CONVERT (A52_3F1R, A52_2F2R): + coeff[0] = coeff[2] = level; + coeff[1] = level * clev; + coeff[3] = level * LEVEL_3DB; + return 7; + + case CONVERT (A52_3F1R, A52_3F2R): + coeff[0] = coeff[1] = coeff[2] = level; + coeff[3] = level * LEVEL_3DB; + return 0; + + case CONVERT (A52_CHANNEL, A52_CHANNEL1): + coeff[0] = level; + coeff[1] = 0; + return 0; + + case CONVERT (A52_CHANNEL, A52_CHANNEL2): + coeff[0] = 0; + coeff[1] = level; + return 0; + } + + return -1; /* NOTREACHED */ +} + +static void mix2to1 (sample_t * dest, sample_t * src, sample_t bias) +{ + int i; + + for (i = 0; i < 256; i++) + dest[i] += src[i] + bias; +} + +static void mix3to1 (sample_t * samples, sample_t bias) +{ + int i; + + for (i = 0; i < 256; i++) + samples[i] += samples[i + 256] + samples[i + 512] + bias; +} + +static void mix4to1 (sample_t * samples, sample_t bias) +{ + int i; + + for (i = 0; i < 256; i++) + samples[i] += (samples[i + 256] + samples[i + 512] + + samples[i + 768] + bias); +} + +static void mix5to1 (sample_t * samples, sample_t bias) +{ + int i; + + for (i = 0; i < 256; i++) + samples[i] += (samples[i + 256] + samples[i + 512] + + samples[i + 768] + samples[i + 1024] + bias); +} + +static void mix3to2 (sample_t * samples, sample_t bias) +{ + int i; + sample_t common; + + for (i = 0; i < 256; i++) { + common = samples[i + 256] + bias; + samples[i] += common; + samples[i + 256] = samples[i + 512] + common; + } +} + +static void mix21to2 (sample_t * left, sample_t * right, sample_t bias) +{ + int i; + sample_t common; + + for (i = 0; i < 256; i++) { + common = right[i + 256] + bias; + left[i] += common; + right[i] += common; + } +} + +static void mix21toS (sample_t * samples, sample_t bias) +{ + int i; + sample_t surround; + + for (i = 0; i < 256; i++) { + surround = samples[i + 512]; + samples[i] += bias - surround; + samples[i + 256] += bias + surround; + } +} + +static void mix31to2 (sample_t * samples, sample_t bias) +{ + int i; + sample_t common; + + for (i = 0; i < 256; i++) { + common = samples[i + 256] + samples[i + 768] + bias; + samples[i] += common; + samples[i + 256] = samples[i + 512] + common; + } +} + +static void mix31toS (sample_t * samples, sample_t bias) +{ + int i; + sample_t common, surround; + + for (i = 0; i < 256; i++) { + common = samples[i + 256] + bias; + surround = samples[i + 768]; + samples[i] += common - surround; + samples[i + 256] = samples[i + 512] + common + surround; + } +} + +static void mix22toS (sample_t * samples, sample_t bias) +{ + int i; + sample_t surround; + + for (i = 0; i < 256; i++) { + surround = samples[i + 512] + samples[i + 768]; + samples[i] += bias - surround; + samples[i + 256] += bias + surround; + } +} + +static void mix32to2 (sample_t * samples, sample_t bias) +{ + int i; + sample_t common; + + for (i = 0; i < 256; i++) { + common = samples[i + 256] + bias; + samples[i] += common + samples[i + 768]; + samples[i + 256] = common + samples[i + 512] + samples[i + 1024]; + } +} + +static void mix32toS (sample_t * samples, sample_t bias) +{ + int i; + sample_t common, surround; + + for (i = 0; i < 256; i++) { + common = samples[i + 256] + bias; + surround = samples[i + 768] + samples[i + 1024]; + samples[i] += common - surround; + samples[i + 256] = samples[i + 512] + common + surround; + } +} + +static void move2to1 (sample_t * src, sample_t * dest, sample_t bias) +{ + int i; + + for (i = 0; i < 256; i++) + dest[i] = src[i] + src[i + 256] + bias; +} + +static void zero (sample_t * samples) +{ + int i; + + for (i = 0; i < 256; i++) + samples[i] = 0; +} + +void downmix (sample_t * samples, int acmod, int output, sample_t bias, + sample_t clev, sample_t slev) +{ + switch (CONVERT (acmod, output & A52_CHANNEL_MASK)) { + + case CONVERT (A52_CHANNEL, A52_CHANNEL2): + memcpy (samples, samples + 256, 256 * sizeof (sample_t)); + break; + + case CONVERT (A52_CHANNEL, A52_MONO): + case CONVERT (A52_STEREO, A52_MONO): + mix_2to1: + mix2to1 (samples, samples + 256, bias); + break; + + case CONVERT (A52_2F1R, A52_MONO): + if (slev == 0) + goto mix_2to1; + case CONVERT (A52_3F, A52_MONO): + mix_3to1: + mix3to1 (samples, bias); + break; + + case CONVERT (A52_3F1R, A52_MONO): + if (slev == 0) + goto mix_3to1; + case CONVERT (A52_2F2R, A52_MONO): + if (slev == 0) + goto mix_2to1; + mix4to1 (samples, bias); + break; + + case CONVERT (A52_3F2R, A52_MONO): + if (slev == 0) + goto mix_3to1; + mix5to1 (samples, bias); + break; + + case CONVERT (A52_MONO, A52_DOLBY): + memcpy (samples + 256, samples, 256 * sizeof (sample_t)); + break; + + case CONVERT (A52_3F, A52_STEREO): + case CONVERT (A52_3F, A52_DOLBY): + mix_3to2: + mix3to2 (samples, bias); + break; + + case CONVERT (A52_2F1R, A52_STEREO): + if (slev == 0) + break; + mix21to2 (samples, samples + 256, bias); + break; + + case CONVERT (A52_2F1R, A52_DOLBY): + mix21toS (samples, bias); + break; + + case CONVERT (A52_3F1R, A52_STEREO): + if (slev == 0) + goto mix_3to2; + mix31to2 (samples, bias); + break; + + case CONVERT (A52_3F1R, A52_DOLBY): + mix31toS (samples, bias); + break; + + case CONVERT (A52_2F2R, A52_STEREO): + if (slev == 0) + break; + mix2to1 (samples, samples + 512, bias); + mix2to1 (samples + 256, samples + 768, bias); + break; + + case CONVERT (A52_2F2R, A52_DOLBY): + mix22toS (samples, bias); + break; + + case CONVERT (A52_3F2R, A52_STEREO): + if (slev == 0) + goto mix_3to2; + mix32to2 (samples, bias); + break; + + case CONVERT (A52_3F2R, A52_DOLBY): + mix32toS (samples, bias); + break; + + case CONVERT (A52_3F1R, A52_3F): + if (slev == 0) + break; + mix21to2 (samples, samples + 512, bias); + break; + + case CONVERT (A52_3F2R, A52_3F): + if (slev == 0) + break; + mix2to1 (samples, samples + 768, bias); + mix2to1 (samples + 512, samples + 1024, bias); + break; + + case CONVERT (A52_3F1R, A52_2F1R): + mix3to2 (samples, bias); + memcpy (samples + 512, samples + 768, 256 * sizeof (sample_t)); + break; + + case CONVERT (A52_2F2R, A52_2F1R): + mix2to1 (samples + 512, samples + 768, bias); + break; + + case CONVERT (A52_3F2R, A52_2F1R): + mix3to2 (samples, bias); + move2to1 (samples + 768, samples + 512, bias); + break; + + case CONVERT (A52_3F2R, A52_3F1R): + mix2to1 (samples + 768, samples + 1024, bias); + break; + + case CONVERT (A52_2F1R, A52_2F2R): + memcpy (samples + 768, samples + 512, 256 * sizeof (sample_t)); + break; + + case CONVERT (A52_3F1R, A52_2F2R): + mix3to2 (samples, bias); + memcpy (samples + 512, samples + 768, 256 * sizeof (sample_t)); + break; + + case CONVERT (A52_3F2R, A52_2F2R): + mix3to2 (samples, bias); + memcpy (samples + 512, samples + 768, 256 * sizeof (sample_t)); + memcpy (samples + 768, samples + 1024, 256 * sizeof (sample_t)); + break; + + case CONVERT (A52_3F1R, A52_3F2R): + memcpy (samples + 1027, samples + 768, 256 * sizeof (sample_t)); + break; + } +} + +void upmix (sample_t * samples, int acmod, int output) +{ + switch (CONVERT (acmod, output & A52_CHANNEL_MASK)) { + + case CONVERT (A52_CHANNEL, A52_CHANNEL2): + memcpy (samples + 256, samples, 256 * sizeof (sample_t)); + break; + + case CONVERT (A52_3F2R, A52_MONO): + zero (samples + 1024); + case CONVERT (A52_3F1R, A52_MONO): + case CONVERT (A52_2F2R, A52_MONO): + zero (samples + 768); + case CONVERT (A52_3F, A52_MONO): + case CONVERT (A52_2F1R, A52_MONO): + zero (samples + 512); + case CONVERT (A52_CHANNEL, A52_MONO): + case CONVERT (A52_STEREO, A52_MONO): + zero (samples + 256); + break; + + case CONVERT (A52_3F2R, A52_STEREO): + case CONVERT (A52_3F2R, A52_DOLBY): + zero (samples + 1024); + case CONVERT (A52_3F1R, A52_STEREO): + case CONVERT (A52_3F1R, A52_DOLBY): + zero (samples + 768); + case CONVERT (A52_3F, A52_STEREO): + case CONVERT (A52_3F, A52_DOLBY): + mix_3to2: + memcpy (samples + 512, samples + 256, 256 * sizeof (sample_t)); + zero (samples + 256); + break; + + case CONVERT (A52_2F2R, A52_STEREO): + case CONVERT (A52_2F2R, A52_DOLBY): + zero (samples + 768); + case CONVERT (A52_2F1R, A52_STEREO): + case CONVERT (A52_2F1R, A52_DOLBY): + zero (samples + 512); + break; + + case CONVERT (A52_3F2R, A52_3F): + zero (samples + 1024); + case CONVERT (A52_3F1R, A52_3F): + case CONVERT (A52_2F2R, A52_2F1R): + zero (samples + 768); + break; + + case CONVERT (A52_3F2R, A52_3F1R): + zero (samples + 1024); + break; + + case CONVERT (A52_3F2R, A52_2F1R): + zero (samples + 1024); + case CONVERT (A52_3F1R, A52_2F1R): + mix_31to21: + memcpy (samples + 768, samples + 512, 256 * sizeof (sample_t)); + goto mix_3to2; + + case CONVERT (A52_3F2R, A52_2F2R): + memcpy (samples + 1024, samples + 768, 256 * sizeof (sample_t)); + goto mix_31to21; + } +} diff --git a/liba52/imdct.c b/liba52/imdct.c new file mode 100644 index 0000000000..8ef4b9d50e --- /dev/null +++ b/liba52/imdct.c @@ -0,0 +1,411 @@ +/* + * imdct.c + * Copyright (C) 2000-2001 Michel Lespinasse + * Copyright (C) 1999-2000 Aaron Holtzman + * + * This file is part of a52dec, a free ATSC A-52 stream decoder. + * See http://liba52.sourceforge.net/ for updates. + * + * a52dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * a52dec is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "config.h" + +#include +#include +#ifndef M_PI +#define M_PI 3.1415926535897932384626433832795029 +#endif +#include + +#include "a52.h" +#include "a52_internal.h" +#include "mm_accel.h" + +void (* imdct_256) (sample_t data[], sample_t delay[], sample_t bias); +void (* imdct_512) (sample_t data[], sample_t delay[], sample_t bias); + +typedef struct complex_s { + sample_t real; + sample_t imag; +} complex_t; + + +/* 128 point bit-reverse LUT */ +static uint8_t bit_reverse_512[] = { + 0x00, 0x40, 0x20, 0x60, 0x10, 0x50, 0x30, 0x70, + 0x08, 0x48, 0x28, 0x68, 0x18, 0x58, 0x38, 0x78, + 0x04, 0x44, 0x24, 0x64, 0x14, 0x54, 0x34, 0x74, + 0x0c, 0x4c, 0x2c, 0x6c, 0x1c, 0x5c, 0x3c, 0x7c, + 0x02, 0x42, 0x22, 0x62, 0x12, 0x52, 0x32, 0x72, + 0x0a, 0x4a, 0x2a, 0x6a, 0x1a, 0x5a, 0x3a, 0x7a, + 0x06, 0x46, 0x26, 0x66, 0x16, 0x56, 0x36, 0x76, + 0x0e, 0x4e, 0x2e, 0x6e, 0x1e, 0x5e, 0x3e, 0x7e, + 0x01, 0x41, 0x21, 0x61, 0x11, 0x51, 0x31, 0x71, + 0x09, 0x49, 0x29, 0x69, 0x19, 0x59, 0x39, 0x79, + 0x05, 0x45, 0x25, 0x65, 0x15, 0x55, 0x35, 0x75, + 0x0d, 0x4d, 0x2d, 0x6d, 0x1d, 0x5d, 0x3d, 0x7d, + 0x03, 0x43, 0x23, 0x63, 0x13, 0x53, 0x33, 0x73, + 0x0b, 0x4b, 0x2b, 0x6b, 0x1b, 0x5b, 0x3b, 0x7b, + 0x07, 0x47, 0x27, 0x67, 0x17, 0x57, 0x37, 0x77, + 0x0f, 0x4f, 0x2f, 0x6f, 0x1f, 0x5f, 0x3f, 0x7f}; + +static uint8_t bit_reverse_256[] = { + 0x00, 0x20, 0x10, 0x30, 0x08, 0x28, 0x18, 0x38, + 0x04, 0x24, 0x14, 0x34, 0x0c, 0x2c, 0x1c, 0x3c, + 0x02, 0x22, 0x12, 0x32, 0x0a, 0x2a, 0x1a, 0x3a, + 0x06, 0x26, 0x16, 0x36, 0x0e, 0x2e, 0x1e, 0x3e, + 0x01, 0x21, 0x11, 0x31, 0x09, 0x29, 0x19, 0x39, + 0x05, 0x25, 0x15, 0x35, 0x0d, 0x2d, 0x1d, 0x3d, + 0x03, 0x23, 0x13, 0x33, 0x0b, 0x2b, 0x1b, 0x3b, + 0x07, 0x27, 0x17, 0x37, 0x0f, 0x2f, 0x1f, 0x3f}; + +static complex_t buf[128]; + +/* Twiddle factor LUT */ +static complex_t w_1[1]; +static complex_t w_2[2]; +static complex_t w_4[4]; +static complex_t w_8[8]; +static complex_t w_16[16]; +static complex_t w_32[32]; +static complex_t w_64[64]; +static complex_t * w[7] = {w_1, w_2, w_4, w_8, w_16, w_32, w_64}; + +/* Twiddle factors for IMDCT */ +static sample_t xcos1[128]; +static sample_t xsin1[128]; +static sample_t xcos2[64]; +static sample_t xsin2[64]; + +/* Windowing function for Modified DCT - Thank you acroread */ +sample_t imdct_window[] = { + 0.00014, 0.00024, 0.00037, 0.00051, 0.00067, 0.00086, 0.00107, 0.00130, + 0.00157, 0.00187, 0.00220, 0.00256, 0.00297, 0.00341, 0.00390, 0.00443, + 0.00501, 0.00564, 0.00632, 0.00706, 0.00785, 0.00871, 0.00962, 0.01061, + 0.01166, 0.01279, 0.01399, 0.01526, 0.01662, 0.01806, 0.01959, 0.02121, + 0.02292, 0.02472, 0.02662, 0.02863, 0.03073, 0.03294, 0.03527, 0.03770, + 0.04025, 0.04292, 0.04571, 0.04862, 0.05165, 0.05481, 0.05810, 0.06153, + 0.06508, 0.06878, 0.07261, 0.07658, 0.08069, 0.08495, 0.08935, 0.09389, + 0.09859, 0.10343, 0.10842, 0.11356, 0.11885, 0.12429, 0.12988, 0.13563, + 0.14152, 0.14757, 0.15376, 0.16011, 0.16661, 0.17325, 0.18005, 0.18699, + 0.19407, 0.20130, 0.20867, 0.21618, 0.22382, 0.23161, 0.23952, 0.24757, + 0.25574, 0.26404, 0.27246, 0.28100, 0.28965, 0.29841, 0.30729, 0.31626, + 0.32533, 0.33450, 0.34376, 0.35311, 0.36253, 0.37204, 0.38161, 0.39126, + 0.40096, 0.41072, 0.42054, 0.43040, 0.44030, 0.45023, 0.46020, 0.47019, + 0.48020, 0.49022, 0.50025, 0.51028, 0.52031, 0.53033, 0.54033, 0.55031, + 0.56026, 0.57019, 0.58007, 0.58991, 0.59970, 0.60944, 0.61912, 0.62873, + 0.63827, 0.64774, 0.65713, 0.66643, 0.67564, 0.68476, 0.69377, 0.70269, + 0.71150, 0.72019, 0.72877, 0.73723, 0.74557, 0.75378, 0.76186, 0.76981, + 0.77762, 0.78530, 0.79283, 0.80022, 0.80747, 0.81457, 0.82151, 0.82831, + 0.83496, 0.84145, 0.84779, 0.85398, 0.86001, 0.86588, 0.87160, 0.87716, + 0.88257, 0.88782, 0.89291, 0.89785, 0.90264, 0.90728, 0.91176, 0.91610, + 0.92028, 0.92432, 0.92822, 0.93197, 0.93558, 0.93906, 0.94240, 0.94560, + 0.94867, 0.95162, 0.95444, 0.95713, 0.95971, 0.96217, 0.96451, 0.96674, + 0.96887, 0.97089, 0.97281, 0.97463, 0.97635, 0.97799, 0.97953, 0.98099, + 0.98236, 0.98366, 0.98488, 0.98602, 0.98710, 0.98811, 0.98905, 0.98994, + 0.99076, 0.99153, 0.99225, 0.99291, 0.99353, 0.99411, 0.99464, 0.99513, + 0.99558, 0.99600, 0.99639, 0.99674, 0.99706, 0.99736, 0.99763, 0.99788, + 0.99811, 0.99831, 0.99850, 0.99867, 0.99882, 0.99895, 0.99908, 0.99919, + 0.99929, 0.99938, 0.99946, 0.99953, 0.99959, 0.99965, 0.99969, 0.99974, + 0.99978, 0.99981, 0.99984, 0.99986, 0.99988, 0.99990, 0.99992, 0.99993, + 0.99994, 0.99995, 0.99996, 0.99997, 0.99998, 0.99998, 0.99998, 0.99999, + 0.99999, 0.99999, 0.99999, 1.00000, 1.00000, 1.00000, 1.00000, 1.00000, + 1.00000, 1.00000, 1.00000, 1.00000, 1.00000, 1.00000, 1.00000, 1.00000 }; + + +static inline void swap_cmplx(complex_t *a, complex_t *b) +{ + complex_t tmp; + + tmp = *a; + *a = *b; + *b = tmp; +} + + + +static inline complex_t cmplx_mult(complex_t a, complex_t b) +{ + complex_t ret; + + ret.real = a.real * b.real - a.imag * b.imag; + ret.imag = a.real * b.imag + a.imag * b.real; + + return ret; +} + +void +imdct_do_512(sample_t data[],sample_t delay[], sample_t bias) +{ + int i,k; + int p,q; + int m; + int two_m; + int two_m_plus_one; + + sample_t tmp_a_i; + sample_t tmp_a_r; + sample_t tmp_b_i; + sample_t tmp_b_r; + + sample_t *data_ptr; + sample_t *delay_ptr; + sample_t *window_ptr; + + /* 512 IMDCT with source and dest data in 'data' */ + + /* Pre IFFT complex multiply plus IFFT cmplx conjugate */ + for( i=0; i < 128; i++) { + /* z[i] = (X[256-2*i-1] + j * X[2*i]) * (xcos1[i] + j * xsin1[i]) ; */ + buf[i].real = (data[256-2*i-1] * xcos1[i]) - (data[2*i] * xsin1[i]); + buf[i].imag = -1.0 * ((data[2*i] * xcos1[i]) + (data[256-2*i-1] * xsin1[i])); + } + + /* Bit reversed shuffling */ + for(i=0; i<128; i++) { + k = bit_reverse_512[i]; + if (k < i) + swap_cmplx(&buf[i],&buf[k]); + } + + /* FFT Merge */ + for (m=0; m < 7; m++) { + if(m) + two_m = (1 << m); + else + two_m = 1; + + two_m_plus_one = (1 << (m+1)); + + for(k = 0; k < two_m; k++) { + for(i = 0; i < 128; i += two_m_plus_one) { + p = k + i; + q = p + two_m; + tmp_a_r = buf[p].real; + tmp_a_i = buf[p].imag; + tmp_b_r = buf[q].real * w[m][k].real - buf[q].imag * w[m][k].imag; + tmp_b_i = buf[q].imag * w[m][k].real + buf[q].real * w[m][k].imag; + buf[p].real = tmp_a_r + tmp_b_r; + buf[p].imag = tmp_a_i + tmp_b_i; + buf[q].real = tmp_a_r - tmp_b_r; + buf[q].imag = tmp_a_i - tmp_b_i; + } + } + } + + /* Post IFFT complex multiply plus IFFT complex conjugate*/ + for( i=0; i < 128; i++) { + /* y[n] = z[n] * (xcos1[n] + j * xsin1[n]) ; */ + tmp_a_r = buf[i].real; + tmp_a_i = -1.0 * buf[i].imag; + buf[i].real =(tmp_a_r * xcos1[i]) - (tmp_a_i * xsin1[i]); + buf[i].imag =(tmp_a_r * xsin1[i]) + (tmp_a_i * xcos1[i]); + } + + data_ptr = data; + delay_ptr = delay; + window_ptr = imdct_window; + + /* Window and convert to real valued signal */ + for(i=0; i< 64; i++) { + *data_ptr++ = -buf[64+i].imag * *window_ptr++ + *delay_ptr++ + bias; + *data_ptr++ = buf[64-i-1].real * *window_ptr++ + *delay_ptr++ + bias; + } + + for(i=0; i< 64; i++) { + *data_ptr++ = -buf[i].real * *window_ptr++ + *delay_ptr++ + bias; + *data_ptr++ = buf[128-i-1].imag * *window_ptr++ + *delay_ptr++ + bias; + } + + /* The trailing edge of the window goes into the delay line */ + delay_ptr = delay; + + for(i=0; i< 64; i++) { + *delay_ptr++ = -buf[64+i].real * *--window_ptr; + *delay_ptr++ = buf[64-i-1].imag * *--window_ptr; + } + + for(i=0; i<64; i++) { + *delay_ptr++ = buf[i].imag * *--window_ptr; + *delay_ptr++ = -buf[128-i-1].real * *--window_ptr; + } +} + +void +imdct_do_256(sample_t data[],sample_t delay[],sample_t bias) +{ + int i,k; + int p,q; + int m; + int two_m; + int two_m_plus_one; + + sample_t tmp_a_i; + sample_t tmp_a_r; + sample_t tmp_b_i; + sample_t tmp_b_r; + + sample_t *data_ptr; + sample_t *delay_ptr; + sample_t *window_ptr; + + complex_t *buf_1, *buf_2; + + buf_1 = &buf[0]; + buf_2 = &buf[64]; + + /* Pre IFFT complex multiply plus IFFT cmplx conjugate */ + for(k=0; k<64; k++) { + /* X1[k] = X[2*k] */ + /* X2[k] = X[2*k+1] */ + + p = 2 * (128-2*k-1); + q = 2 * (2 * k); + + /* Z1[k] = (X1[128-2*k-1] + j * X1[2*k]) * (xcos2[k] + j * xsin2[k]); */ + buf_1[k].real = data[p] * xcos2[k] - data[q] * xsin2[k]; + buf_1[k].imag = -1.0f * (data[q] * xcos2[k] + data[p] * xsin2[k]); + /* Z2[k] = (X2[128-2*k-1] + j * X2[2*k]) * (xcos2[k] + j * xsin2[k]); */ + buf_2[k].real = data[p + 1] * xcos2[k] - data[q + 1] * xsin2[k]; + buf_2[k].imag = -1.0f * ( data[q + 1] * xcos2[k] + data[p + 1] * xsin2[k]); + } + + /* IFFT Bit reversed shuffling */ + for(i=0; i<64; i++) { + k = bit_reverse_256[i]; + if (k < i) { + swap_cmplx(&buf_1[i],&buf_1[k]); + swap_cmplx(&buf_2[i],&buf_2[k]); + } + } + + /* FFT Merge */ + for (m=0; m < 6; m++) { + two_m = (1 << m); + two_m_plus_one = (1 << (m+1)); + + /* FIXME */ + if(m) + two_m = (1 << m); + else + two_m = 1; + + for(k = 0; k < two_m; k++) { + for(i = 0; i < 64; i += two_m_plus_one) { + p = k + i; + q = p + two_m; + /* Do block 1 */ + tmp_a_r = buf_1[p].real; + tmp_a_i = buf_1[p].imag; + tmp_b_r = buf_1[q].real * w[m][k].real - buf_1[q].imag * w[m][k].imag; + tmp_b_i = buf_1[q].imag * w[m][k].real + buf_1[q].real * w[m][k].imag; + buf_1[p].real = tmp_a_r + tmp_b_r; + buf_1[p].imag = tmp_a_i + tmp_b_i; + buf_1[q].real = tmp_a_r - tmp_b_r; + buf_1[q].imag = tmp_a_i - tmp_b_i; + + /* Do block 2 */ + tmp_a_r = buf_2[p].real; + tmp_a_i = buf_2[p].imag; + tmp_b_r = buf_2[q].real * w[m][k].real - buf_2[q].imag * w[m][k].imag; + tmp_b_i = buf_2[q].imag * w[m][k].real + buf_2[q].real * w[m][k].imag; + buf_2[p].real = tmp_a_r + tmp_b_r; + buf_2[p].imag = tmp_a_i + tmp_b_i; + buf_2[q].real = tmp_a_r - tmp_b_r; + buf_2[q].imag = tmp_a_i - tmp_b_i; + } + } + } + + /* Post IFFT complex multiply */ + for( i=0; i < 64; i++) { + /* y1[n] = z1[n] * (xcos2[n] + j * xs in2[n]) ; */ + tmp_a_r = buf_1[i].real; + tmp_a_i = -buf_1[i].imag; + buf_1[i].real =(tmp_a_r * xcos2[i]) - (tmp_a_i * xsin2[i]); + buf_1[i].imag =(tmp_a_r * xsin2[i]) + (tmp_a_i * xcos2[i]); + /* y2[n] = z2[n] * (xcos2[n] + j * xsin2[n]) ; */ + tmp_a_r = buf_2[i].real; + tmp_a_i = -buf_2[i].imag; + buf_2[i].real =(tmp_a_r * xcos2[i]) - (tmp_a_i * xsin2[i]); + buf_2[i].imag =(tmp_a_r * xsin2[i]) + (tmp_a_i * xcos2[i]); + } + + data_ptr = data; + delay_ptr = delay; + window_ptr = imdct_window; + + /* Window and convert to real valued signal */ + for(i=0; i< 64; i++) { + *data_ptr++ = -buf_1[i].imag * *window_ptr++ + *delay_ptr++ + bias; + *data_ptr++ = buf_1[64-i-1].real * *window_ptr++ + *delay_ptr++ + bias; + } + + for(i=0; i< 64; i++) { + *data_ptr++ = -buf_1[i].real * *window_ptr++ + *delay_ptr++ + bias; + *data_ptr++ = buf_1[64-i-1].imag * *window_ptr++ + *delay_ptr++ + bias; + } + + delay_ptr = delay; + + for(i=0; i< 64; i++) { + *delay_ptr++ = -buf_2[i].real * *--window_ptr; + *delay_ptr++ = buf_2[64-i-1].imag * *--window_ptr; + } + + for(i=0; i< 64; i++) { + *delay_ptr++ = buf_2[i].imag * *--window_ptr; + *delay_ptr++ = -buf_2[64-i-1].real * *--window_ptr; + } +} + +void imdct_init (uint32_t mm_accel) +{ +#ifdef LIBA52_MLIB + if (mm_accel & MM_ACCEL_MLIB) { + fprintf (stderr, "Using mlib for IMDCT transform\n"); + imdct_512 = imdct_do_512_mlib; + imdct_256 = imdct_do_256_mlib; + } else +#endif + { + int i, j, k; + + fprintf (stderr, "No accelerated IMDCT transform found\n"); + + /* Twiddle factors to turn IFFT into IMDCT */ + for (i = 0; i < 128; i++) { + xcos1[i] = -cos ((M_PI / 2048) * (8 * i + 1)); + xsin1[i] = -sin ((M_PI / 2048) * (8 * i + 1)); + } + + /* More twiddle factors to turn IFFT into IMDCT */ + for (i = 0; i < 64; i++) { + xcos2[i] = -cos ((M_PI / 1024) * (8 * i + 1)); + xsin2[i] = -sin ((M_PI / 1024) * (8 * i + 1)); + } + + for (i = 0; i < 7; i++) { + j = 1 << i; + for (k = 0; k < j; k++) { + w[i][k].real = cos (-M_PI * k / j); + w[i][k].imag = sin (-M_PI * k / j); + } + } + imdct_512 = imdct_do_512; + imdct_256 = imdct_do_256; + } +} diff --git a/liba52/imdct_mlib.c b/liba52/imdct_mlib.c new file mode 100644 index 0000000000..c24318dbbf --- /dev/null +++ b/liba52/imdct_mlib.c @@ -0,0 +1,139 @@ +/* + * imdct_mlib.c + * Copyright (C) 2000-2001 Michel Lespinasse + * Copyright (C) 1999-2000 Aaron Holtzman + * + * This file is part of a52dec, a free ATSC A-52 stream decoder. + * See http://liba52.sourceforge.net/ for updates. + * + * a52dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * a52dec is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "config.h" + +#ifdef LIBA52_MLIB + +#include +#include +#include +#include +#include + +#include "a52.h" +#include "a52_internal.h" +#include "attributes.h" + +extern sample_t imdct_window[]; + +void +imdct_do_512_mlib(sample_t data[], sample_t delay[], sample_t bias) +{ + sample_t *buf_real; + sample_t *buf_imag; + sample_t *data_ptr; + sample_t *delay_ptr; + sample_t *window_ptr; + sample_t tmp[256] ATTR_ALIGN (16); + int i; + + memcpy(tmp, data, 256 * sizeof(sample_t)); + mlib_SignalIMDCT_F32(tmp); + + buf_real = tmp; + buf_imag = tmp + 128; + data_ptr = data; + delay_ptr = delay; + window_ptr = imdct_window; + + /* Window and convert to real valued signal */ + for(i=0; i< 64; i++) + { + *data_ptr++ = -buf_imag[64+i] * *window_ptr++ + *delay_ptr++ + bias; + *data_ptr++ = buf_real[64-i-1] * *window_ptr++ + *delay_ptr++ + bias; + } + + for(i=0; i< 64; i++) + { + *data_ptr++ = -buf_real[i] * *window_ptr++ + *delay_ptr++ + bias; + *data_ptr++ = buf_imag[128-i-1] * *window_ptr++ + *delay_ptr++ + bias; + } + + /* The trailing edge of the window goes into the delay line */ + delay_ptr = delay; + + for(i=0; i< 64; i++) + { + *delay_ptr++ = -buf_real[64+i] * *--window_ptr; + *delay_ptr++ = buf_imag[64-i-1] * *--window_ptr; + } + + for(i=0; i<64; i++) + { + *delay_ptr++ = buf_imag[i] * *--window_ptr; + *delay_ptr++ = -buf_real[128-i-1] * *--window_ptr; + } +} + +void +imdct_do_256_mlib(sample_t data[], sample_t delay[], sample_t bias) +{ + sample_t *buf1_real, *buf1_imag; + sample_t *buf2_real, *buf2_imag; + sample_t *data_ptr; + sample_t *delay_ptr; + sample_t *window_ptr; + sample_t tmp[256] ATTR_ALIGN (16); + int i; + + memcpy(tmp, data, 256 * sizeof(sample_t)); + mlib_SignalIMDCTSplit_F32(tmp); + + buf1_real = tmp; + buf1_imag = tmp + 128 + 64; + buf2_real = tmp + 64; + buf2_imag = tmp + 128; + data_ptr = data; + delay_ptr = delay; + window_ptr = imdct_window; + + /* Window and convert to real valued signal */ + for(i=0; i< 64; i++) + { + *data_ptr++ = -buf1_imag[i] * *window_ptr++ + *delay_ptr++ + bias; + *data_ptr++ = buf1_real[64-i-1] * *window_ptr++ + *delay_ptr++ + bias; + } + + for(i=0; i< 64; i++) + { + *data_ptr++ = -buf1_real[i] * *window_ptr++ + *delay_ptr++ + bias; + *data_ptr++ = buf1_imag[64-i-1] * *window_ptr++ + *delay_ptr++ + bias; + } + + delay_ptr = delay; + + for(i=0; i< 64; i++) + { + *delay_ptr++ = -buf2_real[i] * *--window_ptr; + *delay_ptr++ = buf2_imag[64-i-1] * *--window_ptr; + } + + for(i=0; i< 64; i++) + { + *delay_ptr++ = buf2_imag[i] * *--window_ptr; + *delay_ptr++ = -buf2_real[64-i-1] * *--window_ptr; + } +} + +#endif diff --git a/liba52/liba52.txt b/liba52/liba52.txt new file mode 100644 index 0000000000..a60a3616f3 --- /dev/null +++ b/liba52/liba52.txt @@ -0,0 +1,208 @@ +Using the liba52 API +-------------------- + +liba52 provides a low-level interface to decoding audio frames encoded +using ATSC standard A/52 aka AC-3. liba52 provides downmixing and +dynamic range compression for the following output configurations: + +A52_CHANNEL : Dual mono. Two independant mono channels. +A52_CHANNEL1 : First of the two mono channels above. +A52_CHANNEL2 : Second of the two mono channels above. +A52_MONO : Mono. +A52_STEREO : Stereo. +A52_DOLBY : Dolby surround compatible stereo. +A52_3F : 3 front channels (left, center, right) +A52_2F1R : 2 front, 1 rear surround channel (L, R, S) +A52_3F1R : 3 front, 1 rear surround channel (L, C, R, S) +A52_2F2R : 2 front, 2 rear surround channels (L, R, LS, RS) +A52_3F2R : 3 front, 2 rear surround channels (L, C, R, LS, RS) + +A52_LFE : Low frequency effects channel. Normally used to connect a + subwoofer. Can be combined with any of the above channels. + For example: A52_3F2R | A52_LFE -> 3 front, 2 rear, 1 LFE (5.1) + + +Initialization +-------------- + +sample_t * a52_init (uint32_t mm_accel); + +Initializes the A/52 library. Takes as a parameter the acceptable +optimizations which may be used, such as MMX. These are found in the +included header file 'mm_accel', along with an autodetection function +(mm_accel()). Currently, the only accelleration implemented is +MM_ACCEL_MLIB, which uses the 'mlib' library if installed. mlib is +only available on some Sun Microsystems platforms. + +The return value is a pointer to a properly-aligned sample buffer used +for output samples. + + +Probing the bitstream +--------------------- + +int a52_syncinfo (uint8_t * buf, int * flags, + int * sample_rate, int * bit_rate); + +The A/52 bitstream is composed of several a52 frames concatenated one +after each other. An a52 frame is the smallest independantly decodable +unit in the stream. + +buf must contain at least 7 bytes from the input stream. If these look +like the start of a valid a52 frame, a52_syncinfo() returns the size +of the coded frame in bytes, and fills flags, sample_rate and bit_rate +with the information encoded in the stream. The returned size is +guaranteed to be an even number between 128 and 3840. sample_rate will +be the sampling frequency in Hz, bit_rate is for the compressed stream +and is in bits per second, and flags is a description of the coded +channels: the A52_LFE bit is set if there is an LFE channel coded in +this stream, and by masking flags with A52_CHANNEL_MASK you will get a +value that describes the full-bandwidth channels, as one of the +A52_CHANNEL...A52_3F2R flags. + +If this can not possibly be a valid frame, then the function returns +0. You should then try to re-synchronize with the a52 stream - one way +to try this would be to advance buf by one byte until its contents +looks like a valid frame, but there might be better +application-specific ways to synchronize. + +It is recommended to call this function for each frame, for several +reasons: this function detects errors that the other functions will +not double-check, consecutive frames might have different lengths, and +it helps you re-sync with the stream if you get de-synchronized. + + +Starting to decode a frame +-------------------------- + +int a52_frame (a52_state_t * state, uint8_t * buf, int * flags, + sample_t * level, sample_t bias); + +This starts the work of decoding the A/52 frame (to be completed using +a52_block()). buf should point to the beginning of the complete frame +of the full size returned by a52_syncinfo(). + +You should pass in the flags the speaker configuration that you +support, and liba52 will return the speaker configuration it will use +for its output, based on what is coded in the stream and what you +asked for. For example, if the stream contains 2+2 channels +(a52_syncinfo() returned A52_2F2R in the flags), and you have 3+1 +speakers (you passed A52_3F1R), then liba52 will choose do downmix to +2+1 speakers, since there is no center channel to send to your center +speaker. So in that case the left and right channels will be +essentially unmodified by the downmix, and the two surround channels +will be added together and sent to your surround speaker. liba52 will +return A52_2F1R to indicate this. + +The good news is that when you downmix to stereo you dont have to +worry about this, you will ALWAYS get a stereo output no matter what +was coded in the stream. For more complex output configurations you +will have to handle the case where liba52 couldnt give you what you +wanted because some of the channels were not encoded in the stream +though. + +Level, bias, and A52_ADJUST_LEVEL: + +Before downmixing, samples are floating point values with a range of +[-1,1]. Most types of downmixing will combine channels together, which +will potentially result in a larger range for the output +samples. liba52 provides two methods of controlling the range of the +output, either before or after the downmix stage. + +If you do not set A52_ADJUST_LEVEL, liba52 will multiply the samples +by your level value, so that they fit in the [-level,level] +range. Then it will apply the standardized downmix equations, +potentially making the samples go out of that interval again. The +level parameter is not modified. + +Setting the A52_ADJUST_LEVEL flag will instruct liba52 to treat your +level value as the intended range interval after downmixing. It will +then figure out what level to use before the downmix (what you should +have passed if you hadnt used the A52_ADJUST_LEVEL flag), and +overwrite the level value you gave it with that new level value. + +The bias represents a value which should be added to the result +regardless: + +output_sample = (input_sample * level) + bias; + +For example, a bias of 384 and a level of 1 tells liba52 you want +samples between 383 and 385 instead of -1 and 1. This is what the +sample program a52dec does, as it makes it faster to convert the +samples to integer format, using a trick based on the IEEE +floating-point format. + +This function also initialises the state for that frame, which will be +reused next when decoding blocks. + + +Dynamic range compression +------------------------- + +void a52_dynrng (a52_state_t * state, + sample_t (* call) (sample_t, void *), void * data); + +This function is purely optional. If you dont call it, liba52 will +provide the default behaviour, which is to apply the full dynamic +range compression as specified in the A/52 stream. This basically +makes the loud sounds softer, and the soft sounds louder, so you can +more easily listen to the stream in a noisy environment without +disturbing anyone. + +If you do call this function and set a NULL callback, this will +totally disable the dynamic range compression and provide a playback +more adapted to a movie theater or a listening room. + +If you call this function and specify a callback function, this +callback might be called up to once for each block, with two +arguments: the compression factor 'c' recommended by the bitstream, +and the private data pointer you specified in a52_dynrng(). The +callback will then return the amount of compression to actually use - +typically pow(c,x) where x is somewhere between 0 and 1. More +elaborate compression functions might want to use a different value +for 'x' depending wether c>1 or c<1 - or even something more complex +if this is what you want. + + +Decoding blocks +--------------- + +int a52_block (a52_state_t * state, sample_t * samples); + +Every A/52 frame is composed of 6 blocks, each with an output of 256 +samples for each channel. The a52_block() function decodes the next +block in the frame, and should be called 6 times to decode all of the +audio in the frame. After each call, you should extract the audio data +from the sample buffer. + +The sample pointer given should be the one a52_init() returned. + +After this function returns, the samples buuffer will contain 256 +samples for the first channel, followed by 256 samples for the second +channel, etc... the channel order is LFE, left, center, right, left +surround, right surround. If one of the channels is not present in the +liba52 output, as indicated by the flags returned by a52_frame(), then +this channel is skipped and the following channels are shifted so +liba52 does not leave an empty space between channels. + + +Pseudocode example +------------------ + +sample_t * samples = a52_init (mm_accel()); + +loop on input bytes: + if at least 7 bytes in the buffer: + + bytes_to_get = a52_syncinfo (...) + + if bytes_to_get == 0: + goto loop to keep looking for sync point + else + get rest of bytes + + a52_frame (state, buf, ...) + [a52_dynrng (state, ...); this is only optional] + for i = 1 ... 6: + a52_block (state, samples) + convert samples to integer and queue to soundcard diff --git a/liba52/mm_accel.h b/liba52/mm_accel.h new file mode 100644 index 0000000000..946e51257a --- /dev/null +++ b/liba52/mm_accel.h @@ -0,0 +1,37 @@ +/* + * mm_accel.h + * Copyright (C) 2000-2001 Michel Lespinasse + * Copyright (C) 1999-2000 Aaron Holtzman + * + * This file is part of a52dec, a free ATSC A-52 stream decoder. + * See http://liba52.sourceforge.net/ for updates. + * + * a52dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * a52dec is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifndef MM_ACCEL_H +#define MM_ACCEL_H + +/* generic accelerations */ +#define MM_ACCEL_MLIB 0x00000001 + +/* x86 accelerations */ +#define MM_ACCEL_X86_MMX 0x80000000 +#define MM_ACCEL_X86_3DNOW 0x40000000 +#define MM_ACCEL_X86_MMXEXT 0x20000000 + +uint32_t mm_accel (void); + +#endif /* MM_ACCEL_H */ diff --git a/liba52/parse.c b/liba52/parse.c new file mode 100644 index 0000000000..05f58b1415 --- /dev/null +++ b/liba52/parse.c @@ -0,0 +1,867 @@ +/* + * parse.c + * Copyright (C) 2000-2001 Michel Lespinasse + * Copyright (C) 1999-2000 Aaron Holtzman + * + * This file is part of a52dec, a free ATSC A-52 stream decoder. + * See http://liba52.sourceforge.net/ for updates. + * + * a52dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * a52dec is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "config.h" + +#include +#include +#include + +#include "a52.h" +#include "a52_internal.h" +#include "bitstream.h" +#include "tables.h" + +#ifdef HAVE_MEMALIGN +/* some systems have memalign() but no declaration for it */ +void * memalign (size_t align, size_t size); +#else +/* assume malloc alignment is sufficient */ +#define memalign(align,size) malloc (size) +#endif + +typedef struct { + sample_t q1[2]; + sample_t q2[2]; + sample_t q4; + int q1_ptr; + int q2_ptr; + int q4_ptr; +} quantizer_t; + +static uint8_t halfrate[12] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3}; + +sample_t * a52_init (uint32_t mm_accel) +{ + sample_t * samples; + int i; + + imdct_init (mm_accel); + + samples = memalign (16, 256 * 12 * sizeof (sample_t)); + if (samples == NULL) + return NULL; + + for (i = 0; i < 256 * 12; i++) + samples[i] = 0; + + return samples; +} + +int a52_syncinfo (uint8_t * buf, int * flags, + int * sample_rate, int * bit_rate) +{ + static int rate[] = { 32, 40, 48, 56, 64, 80, 96, 112, + 128, 160, 192, 224, 256, 320, 384, 448, + 512, 576, 640}; + static uint8_t lfeon[8] = {0x10, 0x10, 0x04, 0x04, 0x04, 0x01, 0x04, 0x01}; + int frmsizecod; + int bitrate; + int half; + int acmod; + + if ((buf[0] != 0x0b) || (buf[1] != 0x77)) /* syncword */ + return 0; + + if (buf[5] >= 0x60) /* bsid >= 12 */ + return 0; + half = halfrate[buf[5] >> 3]; + + /* acmod, dsurmod and lfeon */ + acmod = buf[6] >> 5; + *flags = ((((buf[6] & 0xf8) == 0x50) ? A52_DOLBY : acmod) | + ((buf[6] & lfeon[acmod]) ? A52_LFE : 0)); + + frmsizecod = buf[4] & 63; + if (frmsizecod >= 38) + return 0; + bitrate = rate [frmsizecod >> 1]; + *bit_rate = (bitrate * 1000) >> half; + + switch (buf[4] & 0xc0) { + case 0: /* 48 KHz */ + *sample_rate = 48000 >> half; + return 4 * bitrate; + case 0x40: + *sample_rate = 44100 >> half; + return 2 * (320 * bitrate / 147 + (frmsizecod & 1)); + case 0x80: + *sample_rate = 32000 >> half; + return 6 * bitrate; + default: + return 0; + } +} + +int a52_frame (a52_state_t * state, uint8_t * buf, int * flags, + sample_t * level, sample_t bias) +{ + static sample_t clev[4] = {LEVEL_3DB, LEVEL_45DB, LEVEL_6DB, LEVEL_45DB}; + static sample_t slev[4] = {LEVEL_3DB, LEVEL_6DB, 0, LEVEL_6DB}; + int chaninfo; + int acmod; + + state->fscod = buf[4] >> 6; + state->halfrate = halfrate[buf[5] >> 3]; + state->acmod = acmod = buf[6] >> 5; + + bitstream_set_ptr (buf + 6); + bitstream_get (3); /* skip acmod we already parsed */ + + if ((acmod == 2) && (bitstream_get (2) == 2)) /* dsurmod */ + acmod = A52_DOLBY; + + if ((acmod & 1) && (acmod != 1)) + state->clev = clev[bitstream_get (2)]; /* cmixlev */ + + if (acmod & 4) + state->slev = slev[bitstream_get (2)]; /* surmixlev */ + + state->lfeon = bitstream_get (1); + + state->output = downmix_init (acmod, *flags, level, + state->clev, state->slev); + if (state->output < 0) + return 1; + if (state->lfeon && (*flags & A52_LFE)) + state->output |= A52_LFE; + *flags = state->output; + /* the 2* compensates for differences in imdct */ + state->dynrng = state->level = 2 * *level; + state->bias = bias; + state->dynrnge = 1; + state->dynrngcall = NULL; + + chaninfo = !acmod; + do { + bitstream_get (5); /* dialnorm */ + if (bitstream_get (1)) /* compre */ + bitstream_get (8); /* compr */ + if (bitstream_get (1)) /* langcode */ + bitstream_get (8); /* langcod */ + if (bitstream_get (1)) /* audprodie */ + bitstream_get (7); /* mixlevel + roomtyp */ + } while (chaninfo--); + + bitstream_get (2); /* copyrightb + origbs */ + + if (bitstream_get (1)) /* timecod1e */ + bitstream_get (14); /* timecod1 */ + if (bitstream_get (1)) /* timecod2e */ + bitstream_get (14); /* timecod2 */ + + if (bitstream_get (1)) { /* addbsie */ + int addbsil; + + addbsil = bitstream_get (6); + do { + bitstream_get (8); /* addbsi */ + } while (addbsil--); + } + + return 0; +} + +void a52_dynrng (a52_state_t * state, + sample_t (* call) (sample_t, void *), void * data) +{ + state->dynrnge = 0; + if (call) { + state->dynrnge = 1; + state->dynrngcall = call; + state->dynrngdata = data; + } +} + +static int parse_exponents (int expstr, int ngrps, uint8_t exponent, + uint8_t * dest) +{ + int exps; + + while (ngrps--) { + exps = bitstream_get (7); + + exponent += exp_1[exps]; + if (exponent > 24) + return 1; + + switch (expstr) { + case EXP_D45: + *(dest++) = exponent; + *(dest++) = exponent; + case EXP_D25: + *(dest++) = exponent; + case EXP_D15: + *(dest++) = exponent; + } + + exponent += exp_2[exps]; + if (exponent > 24) + return 1; + + switch (expstr) { + case EXP_D45: + *(dest++) = exponent; + *(dest++) = exponent; + case EXP_D25: + *(dest++) = exponent; + case EXP_D15: + *(dest++) = exponent; + } + + exponent += exp_3[exps]; + if (exponent > 24) + return 1; + + switch (expstr) { + case EXP_D45: + *(dest++) = exponent; + *(dest++) = exponent; + case EXP_D25: + *(dest++) = exponent; + case EXP_D15: + *(dest++) = exponent; + } + } + + return 0; +} + +static int parse_deltba (int8_t * deltba) +{ + int deltnseg, deltlen, delta, j; + + memset (deltba, 0, 50); + + deltnseg = bitstream_get (3); + j = 0; + do { + j += bitstream_get (5); + deltlen = bitstream_get (4); + delta = bitstream_get (3); + delta -= (delta >= 4) ? 3 : 4; + if (!deltlen) + continue; + if (j + deltlen >= 50) + return 1; + while (deltlen--) + deltba[j++] = delta; + } while (deltnseg--); + + return 0; +} + +static inline int zero_snr_offsets (int nfchans, a52_state_t * state) +{ + int i; + + if ((state->csnroffst) || (state->cplinu && state->cplba.fsnroffst) || + (state->lfeon && state->lfeba.fsnroffst)) + return 0; + for (i = 0; i < nfchans; i++) + if (state->ba[i].fsnroffst) + return 0; + return 1; +} + +static inline int16_t dither_gen (void) +{ + static uint16_t lfsr_state = 1; + int16_t state; + + state = dither_lut[lfsr_state >> 8] ^ (lfsr_state << 8); + + lfsr_state = (uint16_t) state; + + return state; +} + +static void coeff_get (sample_t * coeff, uint8_t * exp, int8_t * bap, + quantizer_t * quantizer, sample_t level, + int dither, int end) +{ + int i; + sample_t factor[25]; + + for (i = 0; i <= 24; i++) + factor[i] = scale_factor[i] * level; + + for (i = 0; i < end; i++) { + int bapi; + + bapi = bap[i]; + switch (bapi) { + case 0: + if (dither) { + coeff[i] = dither_gen() * LEVEL_3DB * factor[exp[i]]; + continue; + } else { + coeff[i] = 0; + continue; + } + + case -1: + if (quantizer->q1_ptr >= 0) { + coeff[i] = quantizer->q1[quantizer->q1_ptr--] * factor[exp[i]]; + continue; + } else { + int code; + + code = bitstream_get (5); + + quantizer->q1_ptr = 1; + quantizer->q1[0] = q_1_2[code]; + quantizer->q1[1] = q_1_1[code]; + coeff[i] = q_1_0[code] * factor[exp[i]]; + continue; + } + + case -2: + if (quantizer->q2_ptr >= 0) { + coeff[i] = quantizer->q2[quantizer->q2_ptr--] * factor[exp[i]]; + continue; + } else { + int code; + + code = bitstream_get (7); + + quantizer->q2_ptr = 1; + quantizer->q2[0] = q_2_2[code]; + quantizer->q2[1] = q_2_1[code]; + coeff[i] = q_2_0[code] * factor[exp[i]]; + continue; + } + + case 3: + coeff[i] = q_3[bitstream_get (3)] * factor[exp[i]]; + continue; + + case -3: + if (quantizer->q4_ptr == 0) { + quantizer->q4_ptr = -1; + coeff[i] = quantizer->q4 * factor[exp[i]]; + continue; + } else { + int code; + + code = bitstream_get (7); + + quantizer->q4_ptr = 0; + quantizer->q4 = q_4_1[code]; + coeff[i] = q_4_0[code] * factor[exp[i]]; + continue; + } + + case 4: + coeff[i] = q_5[bitstream_get (4)] * factor[exp[i]]; + continue; + + default: + coeff[i] = ((bitstream_get_2 (bapi) << (16 - bapi)) * + factor[exp[i]]); + } + } +} + +static void coeff_get_coupling (a52_state_t * state, int nfchans, + sample_t * coeff, sample_t (* samples)[256], + quantizer_t * quantizer, uint8_t dithflag[5]) +{ + int sub_bnd, bnd, i, i_end, ch; + int8_t * bap; + uint8_t * exp; + sample_t cplco[5]; + + bap = state->cpl_bap; + exp = state->cpl_exp; + sub_bnd = bnd = 0; + i = state->cplstrtmant; + while (i < state->cplendmant) { + i_end = i + 12; + while (state->cplbndstrc[sub_bnd++]) + i_end += 12; + for (ch = 0; ch < nfchans; ch++) + cplco[ch] = state->cplco[ch][bnd] * coeff[ch]; + bnd++; + + while (i < i_end) { + sample_t cplcoeff; + int bapi; + + bapi = bap[i]; + switch (bapi) { + case 0: + cplcoeff = LEVEL_3DB * scale_factor[exp[i]]; + for (ch = 0; ch < nfchans; ch++) + if (state->chincpl[ch]) { + if (dithflag[ch]) + samples[ch][i] = (cplcoeff * cplco[ch] * + dither_gen ()); + else + samples[ch][i] = 0; + } + i++; + continue; + + case -1: + if (quantizer->q1_ptr >= 0) { + cplcoeff = quantizer->q1[quantizer->q1_ptr--]; + break; + } else { + int code; + + code = bitstream_get (5); + + quantizer->q1_ptr = 1; + quantizer->q1[0] = q_1_2[code]; + quantizer->q1[1] = q_1_1[code]; + cplcoeff = q_1_0[code]; + break; + } + + case -2: + if (quantizer->q2_ptr >= 0) { + cplcoeff = quantizer->q2[quantizer->q2_ptr--]; + break; + } else { + int code; + + code = bitstream_get (7); + + quantizer->q2_ptr = 1; + quantizer->q2[0] = q_2_2[code]; + quantizer->q2[1] = q_2_1[code]; + cplcoeff = q_2_0[code]; + break; + } + + case 3: + cplcoeff = q_3[bitstream_get (3)]; + break; + + case -3: + if (quantizer->q4_ptr == 0) { + quantizer->q4_ptr = -1; + cplcoeff = quantizer->q4; + break; + } else { + int code; + + code = bitstream_get (7); + + quantizer->q4_ptr = 0; + quantizer->q4 = q_4_1[code]; + cplcoeff = q_4_0[code]; + break; + } + + case 4: + cplcoeff = q_5[bitstream_get (4)]; + break; + + default: + cplcoeff = bitstream_get_2 (bapi) << (16 - bapi); + } + + cplcoeff *= scale_factor[exp[i]]; + for (ch = 0; ch < nfchans; ch++) + if (state->chincpl[ch]) + samples[ch][i] = cplcoeff * cplco[ch]; + i++; + } + } +} + +int a52_block (a52_state_t * state, sample_t * samples) +{ + static const uint8_t nfchans_tbl[] = {2, 1, 2, 3, 3, 4, 4, 5, 1, 1, 2}; + static int rematrix_band[4] = {25, 37, 61, 253}; + int i, nfchans, chaninfo; + uint8_t cplexpstr, chexpstr[5], lfeexpstr, do_bit_alloc, done_cpl; + uint8_t blksw[5], dithflag[5]; + sample_t coeff[5]; + int chanbias; + quantizer_t quantizer; + + nfchans = nfchans_tbl[state->acmod]; + + for (i = 0; i < nfchans; i++) + blksw[i] = bitstream_get (1); + + for (i = 0; i < nfchans; i++) + dithflag[i] = bitstream_get (1); + + chaninfo = !(state->acmod); + do { + if (bitstream_get (1)) { /* dynrnge */ + int dynrng; + + dynrng = bitstream_get_2 (8); + if (state->dynrnge) { + sample_t range; + + range = ((((dynrng & 0x1f) | 0x20) << 13) * + scale_factor[3 - (dynrng >> 5)]); + if (state->dynrngcall) + range = state->dynrngcall (range, state->dynrngdata); + state->dynrng = state->level * range; + } + } + } while (chaninfo--); + + if (bitstream_get (1)) { /* cplstre */ + state->cplinu = bitstream_get (1); + if (state->cplinu) { + static int bndtab[16] = {31, 35, 37, 39, 41, 42, 43, 44, + 45, 45, 46, 46, 47, 47, 48, 48}; + int cplbegf; + int cplendf; + int ncplsubnd; + + for (i = 0; i < nfchans; i++) + state->chincpl[i] = bitstream_get (1); + switch (state->acmod) { + case 0: case 1: + return 1; + case 2: + state->phsflginu = bitstream_get (1); + } + cplbegf = bitstream_get (4); + cplendf = bitstream_get (4); + + if (cplendf + 3 - cplbegf < 0) + return 1; + state->ncplbnd = ncplsubnd = cplendf + 3 - cplbegf; + state->cplstrtbnd = bndtab[cplbegf]; + state->cplstrtmant = cplbegf * 12 + 37; + state->cplendmant = cplendf * 12 + 73; + + for (i = 0; i < ncplsubnd - 1; i++) { + state->cplbndstrc[i] = bitstream_get (1); + state->ncplbnd -= state->cplbndstrc[i]; + } + state->cplbndstrc[i] = 0; /* last value is a sentinel */ + } + } + + if (state->cplinu) { + int j, cplcoe; + + cplcoe = 0; + for (i = 0; i < nfchans; i++) + if (state->chincpl[i]) + if (bitstream_get (1)) { /* cplcoe */ + int mstrcplco, cplcoexp, cplcomant; + + cplcoe = 1; + mstrcplco = 3 * bitstream_get (2); + for (j = 0; j < state->ncplbnd; j++) { + cplcoexp = bitstream_get (4); + cplcomant = bitstream_get (4); + if (cplcoexp == 15) + cplcomant <<= 14; + else + cplcomant = (cplcomant | 0x10) << 13; + state->cplco[i][j] = + cplcomant * scale_factor[cplcoexp + mstrcplco]; + } + } + if ((state->acmod == 2) && state->phsflginu && cplcoe) + for (j = 0; j < state->ncplbnd; j++) + if (bitstream_get (1)) /* phsflg */ + state->cplco[1][j] = -state->cplco[1][j]; + } + + if ((state->acmod == 2) && (bitstream_get (1))) { /* rematstr */ + int end; + + end = (state->cplinu) ? state->cplstrtmant : 253; + i = 0; + do + state->rematflg[i] = bitstream_get (1); + while (rematrix_band[i++] < end); + } + + cplexpstr = EXP_REUSE; + lfeexpstr = EXP_REUSE; + if (state->cplinu) + cplexpstr = bitstream_get (2); + for (i = 0; i < nfchans; i++) + chexpstr[i] = bitstream_get (2); + if (state->lfeon) + lfeexpstr = bitstream_get (1); + + for (i = 0; i < nfchans; i++) + if (chexpstr[i] != EXP_REUSE) { + if (state->cplinu && state->chincpl[i]) + state->endmant[i] = state->cplstrtmant; + else { + int chbwcod; + + chbwcod = bitstream_get (6); + if (chbwcod > 60) + return 1; + state->endmant[i] = chbwcod * 3 + 73; + } + } + + do_bit_alloc = 0; + + if (cplexpstr != EXP_REUSE) { + int cplabsexp, ncplgrps; + + do_bit_alloc = 64; + ncplgrps = ((state->cplendmant - state->cplstrtmant) / + (3 << (cplexpstr - 1))); + cplabsexp = bitstream_get (4) << 1; + if (parse_exponents (cplexpstr, ncplgrps, cplabsexp, + state->cpl_exp + state->cplstrtmant)) + return 1; + } + for (i = 0; i < nfchans; i++) + if (chexpstr[i] != EXP_REUSE) { + int grp_size, nchgrps; + + do_bit_alloc |= 1 << i; + grp_size = 3 << (chexpstr[i] - 1); + nchgrps = (state->endmant[i] + grp_size - 4) / grp_size; + state->fbw_exp[i][0] = bitstream_get (4); + if (parse_exponents (chexpstr[i], nchgrps, state->fbw_exp[i][0], + state->fbw_exp[i] + 1)) + return 1; + bitstream_get (2); /* gainrng */ + } + if (lfeexpstr != EXP_REUSE) { + do_bit_alloc |= 32; + state->lfe_exp[0] = bitstream_get (4); + if (parse_exponents (lfeexpstr, 2, state->lfe_exp[0], + state->lfe_exp + 1)) + return 1; + } + + if (bitstream_get (1)) { /* baie */ + do_bit_alloc = -1; + state->sdcycod = bitstream_get (2); + state->fdcycod = bitstream_get (2); + state->sgaincod = bitstream_get (2); + state->dbpbcod = bitstream_get (2); + state->floorcod = bitstream_get (3); + } + if (bitstream_get (1)) { /* snroffste */ + do_bit_alloc = -1; + state->csnroffst = bitstream_get (6); + if (state->cplinu) { + state->cplba.fsnroffst = bitstream_get (4); + state->cplba.fgaincod = bitstream_get (3); + } + for (i = 0; i < nfchans; i++) { + state->ba[i].fsnroffst = bitstream_get (4); + state->ba[i].fgaincod = bitstream_get (3); + } + if (state->lfeon) { + state->lfeba.fsnroffst = bitstream_get (4); + state->lfeba.fgaincod = bitstream_get (3); + } + } + if ((state->cplinu) && (bitstream_get (1))) { /* cplleake */ + do_bit_alloc |= 64; + state->cplfleak = 2304 - (bitstream_get (3) << 8); + state->cplsleak = 2304 - (bitstream_get (3) << 8); + } + + if (bitstream_get (1)) { /* deltbaie */ + do_bit_alloc = -1; + if (state->cplinu) + state->cplba.deltbae = bitstream_get (2); + for (i = 0; i < nfchans; i++) + state->ba[i].deltbae = bitstream_get (2); + if (state->cplinu && (state->cplba.deltbae == DELTA_BIT_NEW) && + parse_deltba (state->cplba.deltba)) + return 1; + for (i = 0; i < nfchans; i++) + if ((state->ba[i].deltbae == DELTA_BIT_NEW) && + parse_deltba (state->ba[i].deltba)) + return 1; + } + + if (do_bit_alloc) { + if (zero_snr_offsets (nfchans, state)) { + memset (state->cpl_bap, 0, sizeof (state->cpl_bap)); + memset (state->fbw_bap, 0, sizeof (state->fbw_bap)); + memset (state->lfe_bap, 0, sizeof (state->lfe_bap)); + } else { + if (state->cplinu && (do_bit_alloc & 64)) + bit_allocate (state, &state->cplba, state->cplstrtbnd, + state->cplstrtmant, state->cplendmant, + state->cplfleak, state->cplsleak, + state->cpl_exp, state->cpl_bap); + for (i = 0; i < nfchans; i++) + if (do_bit_alloc & (1 << i)) + bit_allocate (state, state->ba + i, 0, 0, + state->endmant[i], 0, 0, state->fbw_exp[i], + state->fbw_bap[i]); + if (state->lfeon && (do_bit_alloc & 32)) { + state->lfeba.deltbae = DELTA_BIT_NONE; + bit_allocate (state, &state->lfeba, 0, 0, 7, 0, 0, + state->lfe_exp, state->lfe_bap); + } + } + } + + if (bitstream_get (1)) { /* skiple */ + i = bitstream_get (9); /* skipl */ + while (i--) + bitstream_get (8); + } + + if (state->output & A52_LFE) + samples += 256; /* shift for LFE channel */ + + chanbias = downmix_coeff (coeff, state->acmod, state->output, + state->dynrng, state->clev, state->slev); + + quantizer.q1_ptr = quantizer.q2_ptr = quantizer.q4_ptr = -1; + done_cpl = 0; + + for (i = 0; i < nfchans; i++) { + int j; + + coeff_get (samples + 256 * i, state->fbw_exp[i], state->fbw_bap[i], + &quantizer, coeff[i], dithflag[i], state->endmant[i]); + + if (state->cplinu && state->chincpl[i]) { + if (!done_cpl) { + done_cpl = 1; + coeff_get_coupling (state, nfchans, coeff, + (sample_t (*)[256])samples, &quantizer, + dithflag); + } + j = state->cplendmant; + } else + j = state->endmant[i]; + do + (samples + 256 * i)[j] = 0; + while (++j < 256); + } + + if (state->acmod == 2) { + int j, end, band; + + end = ((state->endmant[0] < state->endmant[1]) ? + state->endmant[0] : state->endmant[1]); + + i = 0; + j = 13; + do { + if (!state->rematflg[i]) { + j = rematrix_band[i++]; + continue; + } + band = rematrix_band[i++]; + if (band > end) + band = end; + do { + sample_t tmp0, tmp1; + + tmp0 = samples[j]; + tmp1 = (samples+256)[j]; + samples[j] = tmp0 + tmp1; + (samples+256)[j] = tmp0 - tmp1; + } while (++j < band); + } while (j < end); + } + + if (state->lfeon) { + if (state->output & A52_LFE) { + coeff_get (samples - 256, state->lfe_exp, state->lfe_bap, + &quantizer, state->dynrng, 0, 7); + for (i = 7; i < 256; i++) + (samples-256)[i] = 0; + imdct_512 (samples - 256, samples + 1536 - 256, state->bias); + } else { + /* just skip the LFE coefficients */ + coeff_get (samples + 1280, state->lfe_exp, state->lfe_bap, + &quantizer, 0, 0, 7); + } + } + + i = 0; + if (nfchans_tbl[state->output & A52_CHANNEL_MASK] < nfchans) + for (i = 1; i < nfchans; i++) + if (blksw[i] != blksw[0]) + break; + + if (i < nfchans) { + if (samples[2 * 1536 - 1] == (sample_t)0x776b6e21) { + samples[2 * 1536 - 1] = 0; + upmix (samples + 1536, state->acmod, state->output); + } + + for (i = 0; i < nfchans; i++) { + sample_t bias; + + bias = 0; + if (!(chanbias & (1 << i))) + bias = state->bias; + + if (coeff[i]) { + if (blksw[i]) + imdct_256 (samples + 256 * i, samples + 1536 + 256 * i, + bias); + else + imdct_512 (samples + 256 * i, samples + 1536 + 256 * i, + bias); + } else { + int j; + + for (j = 0; j < 256; j++) + (samples + 256 * i)[j] = bias; + } + } + + downmix (samples, state->acmod, state->output, state->bias, + state->clev, state->slev); + } else { + nfchans = nfchans_tbl[state->output & A52_CHANNEL_MASK]; + + downmix (samples, state->acmod, state->output, 0, + state->clev, state->slev); + + if (samples[2 * 1536 - 1] != (sample_t)0x776b6e21) { + downmix (samples + 1536, state->acmod, state->output, 0, + state->clev, state->slev); + samples[2 * 1536 - 1] = (sample_t)0x776b6e21; + } + + if (blksw[0]) + for (i = 0; i < nfchans; i++) + imdct_256 (samples + 256 * i, samples + 1536 + 256 * i, + state->bias); + else + for (i = 0; i < nfchans; i++) + imdct_512 (samples + 256 * i, samples + 1536 + 256 * i, + state->bias); + } + + return 0; +} diff --git a/liba52/tables.h b/liba52/tables.h new file mode 100644 index 0000000000..7dc5ed731d --- /dev/null +++ b/liba52/tables.h @@ -0,0 +1,246 @@ +/* + * tables.h + * Copyright (C) 2000-2001 Michel Lespinasse + * Copyright (C) 1999-2000 Aaron Holtzman + * + * This file is part of a52dec, a free ATSC A-52 stream decoder. + * See http://liba52.sourceforge.net/ for updates. + * + * a52dec is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * a52dec is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +static int8_t exp_1[128] = { + -2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2,-2, + -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, + 25,25,25 +}; +static int8_t exp_2[128] = { + -2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, + -2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, + -2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, + -2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, + -2,-2,-2,-2,-2,-1,-1,-1,-1,-1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, + 25,25,25 +}; +static int8_t exp_3[128] = { + -2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2, + -2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2, + -2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2, + -2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2, + -2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2,-2,-1, 0, 1, 2, + 25,25,25 +}; + +#define Q0 ((-2 << 15) / 3.0) +#define Q1 (0) +#define Q2 ((2 << 15) / 3.0) + +static const sample_t q_1_0[32] = { + Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0, + Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1, + Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2, + 0,0,0,0,0 +}; + +static const sample_t q_1_1[32] = { + Q0,Q0,Q0,Q1,Q1,Q1,Q2,Q2,Q2, + Q0,Q0,Q0,Q1,Q1,Q1,Q2,Q2,Q2, + Q0,Q0,Q0,Q1,Q1,Q1,Q2,Q2,Q2, + 0,0,0,0,0 +}; + +static const sample_t q_1_2[32] = { + Q0,Q1,Q2,Q0,Q1,Q2,Q0,Q1,Q2, + Q0,Q1,Q2,Q0,Q1,Q2,Q0,Q1,Q2, + Q0,Q1,Q2,Q0,Q1,Q2,Q0,Q1,Q2, + 0,0,0,0,0 +}; + +#undef Q0 +#undef Q1 +#undef Q2 + +#define Q0 ((-4 << 15) / 5.0) +#define Q1 ((-2 << 15) / 5.0) +#define Q2 (0) +#define Q3 ((2 << 15) / 5.0) +#define Q4 ((4 << 15) / 5.0) + +static const sample_t q_2_0[128] = { + Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0,Q0, + Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1,Q1, + Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2,Q2, + Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3,Q3, + Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4,Q4, + 0,0,0 +}; + +static const sample_t q_2_1[128] = { + Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4, + Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4, + Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4, + Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4, + Q0,Q0,Q0,Q0,Q0,Q1,Q1,Q1,Q1,Q1,Q2,Q2,Q2,Q2,Q2,Q3,Q3,Q3,Q3,Q3,Q4,Q4,Q4,Q4,Q4, + 0,0,0 +}; + +static const sample_t q_2_2[128] = { + Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4, + Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4, + Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4, + Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4, + Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4,Q0,Q1,Q2,Q3,Q4, + 0,0,0 +}; + +#undef Q0 +#undef Q1 +#undef Q2 +#undef Q3 +#undef Q4 + +static const sample_t q_3[8] = { + (-6 << 15)/7.0, (-4 << 15)/7.0, (-2 << 15)/7.0, 0, + ( 2 << 15)/7.0, ( 4 << 15)/7.0, ( 6 << 15)/7.0, 0 +}; + +#define Q0 ((-10 << 15) / 11.0) +#define Q1 ((-8 << 15) / 11.0) +#define Q2 ((-6 << 15) / 11.0) +#define Q3 ((-4 << 15) / 11.0) +#define Q4 ((-2 << 15) / 11.0) +#define Q5 (0) +#define Q6 ((2 << 15) / 11.0) +#define Q7 ((4 << 15) / 11.0) +#define Q8 ((6 << 15) / 11.0) +#define Q9 ((8 << 15) / 11.0) +#define QA ((10 << 15) / 11.0) + +static const sample_t q_4_0[128] = { + Q0, Q0, Q0, Q0, Q0, Q0, Q0, Q0, Q0, Q0, Q0, + Q1, Q1, Q1, Q1, Q1, Q1, Q1, Q1, Q1, Q1, Q1, + Q2, Q2, Q2, Q2, Q2, Q2, Q2, Q2, Q2, Q2, Q2, + Q3, Q3, Q3, Q3, Q3, Q3, Q3, Q3, Q3, Q3, Q3, + Q4, Q4, Q4, Q4, Q4, Q4, Q4, Q4, Q4, Q4, Q4, + Q5, Q5, Q5, Q5, Q5, Q5, Q5, Q5, Q5, Q5, Q5, + Q6, Q6, Q6, Q6, Q6, Q6, Q6, Q6, Q6, Q6, Q6, + Q7, Q7, Q7, Q7, Q7, Q7, Q7, Q7, Q7, Q7, Q7, + Q8, Q8, Q8, Q8, Q8, Q8, Q8, Q8, Q8, Q8, Q8, + Q9, Q9, Q9, Q9, Q9, Q9, Q9, Q9, Q9, Q9, Q9, + QA, QA, QA, QA, QA, QA, QA, QA, QA, QA, QA, + 0, 0, 0, 0, 0, 0, 0 +}; + +static const sample_t q_4_1[128] = { + Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA, + Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA, + Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA, + Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA, + Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA, + Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA, + Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA, + Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA, + Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA, + Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA, + Q0, Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, QA, + 0, 0, 0, 0, 0, 0, 0 +}; + +#undef Q0 +#undef Q1 +#undef Q2 +#undef Q3 +#undef Q4 +#undef Q5 +#undef Q6 +#undef Q7 +#undef Q8 +#undef Q9 +#undef QA + +static const sample_t q_5[16] = { + (-14 << 15)/15.0,(-12 << 15)/15.0,(-10 << 15)/15.0, + ( -8 << 15)/15.0,( -6 << 15)/15.0,( -4 << 15)/15.0, + ( -2 << 15)/15.0, 0 ,( 2 << 15)/15.0, + ( 4 << 15)/15.0,( 6 << 15)/15.0,( 8 << 15)/15.0, + ( 10 << 15)/15.0,( 12 << 15)/15.0,( 14 << 15)/15.0, + 0 +}; + +static sample_t scale_factor[25] = { + 0.000030517578125, + 0.0000152587890625, + 0.00000762939453125, + 0.000003814697265625, + 0.0000019073486328125, + 0.00000095367431640625, + 0.000000476837158203125, + 0.0000002384185791015625, + 0.00000011920928955078125, + 0.000000059604644775390625, + 0.0000000298023223876953125, + 0.00000001490116119384765625, + 0.000000007450580596923828125, + 0.0000000037252902984619140625, + 0.00000000186264514923095703125, + 0.000000000931322574615478515625, + 0.0000000004656612873077392578125, + 0.00000000023283064365386962890625, + 0.000000000116415321826934814453125, + 0.0000000000582076609134674072265625, + 0.00000000002910383045673370361328125, + 0.000000000014551915228366851806640625, + 0.0000000000072759576141834259033203125, + 0.00000000000363797880709171295166015625, + 0.000000000001818989403545856475830078125 +}; + +static const uint16_t dither_lut[256] = { + 0x0000, 0xa011, 0xe033, 0x4022, 0x6077, 0xc066, 0x8044, 0x2055, + 0xc0ee, 0x60ff, 0x20dd, 0x80cc, 0xa099, 0x0088, 0x40aa, 0xe0bb, + 0x21cd, 0x81dc, 0xc1fe, 0x61ef, 0x41ba, 0xe1ab, 0xa189, 0x0198, + 0xe123, 0x4132, 0x0110, 0xa101, 0x8154, 0x2145, 0x6167, 0xc176, + 0x439a, 0xe38b, 0xa3a9, 0x03b8, 0x23ed, 0x83fc, 0xc3de, 0x63cf, + 0x8374, 0x2365, 0x6347, 0xc356, 0xe303, 0x4312, 0x0330, 0xa321, + 0x6257, 0xc246, 0x8264, 0x2275, 0x0220, 0xa231, 0xe213, 0x4202, + 0xa2b9, 0x02a8, 0x428a, 0xe29b, 0xc2ce, 0x62df, 0x22fd, 0x82ec, + 0x8734, 0x2725, 0x6707, 0xc716, 0xe743, 0x4752, 0x0770, 0xa761, + 0x47da, 0xe7cb, 0xa7e9, 0x07f8, 0x27ad, 0x87bc, 0xc79e, 0x678f, + 0xa6f9, 0x06e8, 0x46ca, 0xe6db, 0xc68e, 0x669f, 0x26bd, 0x86ac, + 0x6617, 0xc606, 0x8624, 0x2635, 0x0660, 0xa671, 0xe653, 0x4642, + 0xc4ae, 0x64bf, 0x249d, 0x848c, 0xa4d9, 0x04c8, 0x44ea, 0xe4fb, + 0x0440, 0xa451, 0xe473, 0x4462, 0x6437, 0xc426, 0x8404, 0x2415, + 0xe563, 0x4572, 0x0550, 0xa541, 0x8514, 0x2505, 0x6527, 0xc536, + 0x258d, 0x859c, 0xc5be, 0x65af, 0x45fa, 0xe5eb, 0xa5c9, 0x05d8, + 0xae79, 0x0e68, 0x4e4a, 0xee5b, 0xce0e, 0x6e1f, 0x2e3d, 0x8e2c, + 0x6e97, 0xce86, 0x8ea4, 0x2eb5, 0x0ee0, 0xaef1, 0xeed3, 0x4ec2, + 0x8fb4, 0x2fa5, 0x6f87, 0xcf96, 0xefc3, 0x4fd2, 0x0ff0, 0xafe1, + 0x4f5a, 0xef4b, 0xaf69, 0x0f78, 0x2f2d, 0x8f3c, 0xcf1e, 0x6f0f, + 0xede3, 0x4df2, 0x0dd0, 0xadc1, 0x8d94, 0x2d85, 0x6da7, 0xcdb6, + 0x2d0d, 0x8d1c, 0xcd3e, 0x6d2f, 0x4d7a, 0xed6b, 0xad49, 0x0d58, + 0xcc2e, 0x6c3f, 0x2c1d, 0x8c0c, 0xac59, 0x0c48, 0x4c6a, 0xec7b, + 0x0cc0, 0xacd1, 0xecf3, 0x4ce2, 0x6cb7, 0xcca6, 0x8c84, 0x2c95, + 0x294d, 0x895c, 0xc97e, 0x696f, 0x493a, 0xe92b, 0xa909, 0x0918, + 0xe9a3, 0x49b2, 0x0990, 0xa981, 0x89d4, 0x29c5, 0x69e7, 0xc9f6, + 0x0880, 0xa891, 0xe8b3, 0x48a2, 0x68f7, 0xc8e6, 0x88c4, 0x28d5, + 0xc86e, 0x687f, 0x285d, 0x884c, 0xa819, 0x0808, 0x482a, 0xe83b, + 0x6ad7, 0xcac6, 0x8ae4, 0x2af5, 0x0aa0, 0xaab1, 0xea93, 0x4a82, + 0xaa39, 0x0a28, 0x4a0a, 0xea1b, 0xca4e, 0x6a5f, 0x2a7d, 0x8a6c, + 0x4b1a, 0xeb0b, 0xab29, 0x0b38, 0x2b6d, 0x8b7c, 0xcb5e, 0x6b4f, + 0x8bf4, 0x2be5, 0x6bc7, 0xcbd6, 0xeb83, 0x4b92, 0x0bb0, 0xaba1 +};