+++ /dev/null
-/*
- * parse.c
- * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
- * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
- *
- * 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 "a52.h"
-#include "a52_internal.h"
-#include "bitstream.h"
-#include "tables.h"
-
-#if defined(HAVE_MEMALIGN) && !defined(__cplusplus)
-/* 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 {
- quantizer_t q1[2];
- quantizer_t q2[2];
- quantizer_t q4;
- int q1_ptr;
- int q2_ptr;
- int q4_ptr;
-} quantizer_set_t;
-
-static uint8_t halfrate[12] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3};
-
-a52_state_t * a52_init (uint32_t mm_accel)
-{
- a52_state_t * state;
- int i;
-
- state = (a52_state_t *) malloc (sizeof (a52_state_t));
- if (state == NULL)
- return NULL;
-
- state->samples = (sample_t *) memalign (16, 256 * 12 * sizeof (sample_t));
- if (state->samples == NULL) {
- free (state);
- return NULL;
- }
-
- for (i = 0; i < 256 * 12; i++)
- state->samples[i] = 0;
-
- state->downmixed = 1;
-
- state->lfsr_state = 1;
-
- a52_imdct_init (mm_accel);
-
- return state;
-}
-
-sample_t * a52_samples (a52_state_t * state)
-{
- return state->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:
- *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,
- level_t * level, sample_t bias)
-{
- static level_t clev[4] = { LEVEL (LEVEL_3DB), LEVEL (LEVEL_45DB),
- LEVEL (LEVEL_6DB), LEVEL (LEVEL_45DB) };
- static level_t slev[4] = { LEVEL (LEVEL_3DB), LEVEL (LEVEL_6DB),
- 0, LEVEL (LEVEL_6DB) };
- int chaninfo;
- int acmod;
-
- state->fscod = buf[4] >> 6;
- state->halfrate = halfrate[buf[5] >> 3];
- state->acmod = acmod = buf[6] >> 5;
-
- a52_bitstream_set_ptr (state, buf + 6);
- bitstream_get (state, 3); /* skip acmod we already parsed */
-
- if ((acmod == 2) && (bitstream_get (state, 2) == 2)) /* dsurmod */
- acmod = A52_DOLBY;
-
- state->clev = state->slev = 0;
-
- if ((acmod & 1) && (acmod != 1))
- state->clev = clev[bitstream_get (state, 2)]; /* cmixlev */
-
- if (acmod & 4)
- state->slev = slev[bitstream_get (state, 2)]; /* surmixlev */
-
- state->lfeon = bitstream_get (state, 1);
-
- state->output = a52_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 = MUL_C (*level, 2);
- state->bias = bias;
- state->dynrnge = 1;
- state->dynrngcall = NULL;
- state->cplba.deltbae = DELTA_BIT_NONE;
- state->ba[0].deltbae = state->ba[1].deltbae = state->ba[2].deltbae =
- state->ba[3].deltbae = state->ba[4].deltbae = DELTA_BIT_NONE;
-
- chaninfo = !acmod;
- do {
- bitstream_get (state, 5); /* dialnorm */
- if (bitstream_get (state, 1)) /* compre */
- bitstream_get (state, 8); /* compr */
- if (bitstream_get (state, 1)) /* langcode */
- bitstream_get (state, 8); /* langcod */
- if (bitstream_get (state, 1)) /* audprodie */
- bitstream_get (state, 7); /* mixlevel + roomtyp */
- } while (chaninfo--);
-
- bitstream_get (state, 2); /* copyrightb + origbs */
-
- if (bitstream_get (state, 1)) /* timecod1e */
- bitstream_get (state, 14); /* timecod1 */
- if (bitstream_get (state, 1)) /* timecod2e */
- bitstream_get (state, 14); /* timecod2 */
-
- if (bitstream_get (state, 1)) { /* addbsie */
- int addbsil;
-
- addbsil = bitstream_get (state, 6);
- do {
- bitstream_get (state, 8); /* addbsi */
- } while (addbsil--);
- }
-
- return 0;
-}
-
-void a52_dynrng (a52_state_t * state,
- level_t (* call) (level_t, void *), void * data)
-{
- state->dynrnge = 0;
- if (call) {
- state->dynrnge = 1;
- state->dynrngcall = call;
- state->dynrngdata = data;
- }
-}
-
-static int parse_exponents (a52_state_t * state, int expstr, int ngrps,
- uint8_t exponent, uint8_t * dest)
-{
- int exps;
-
- while (ngrps--) {
- exps = bitstream_get (state, 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 (a52_state_t * state, int8_t * deltba)
-{
- int deltnseg, deltlen, delta, j;
-
- memset (deltba, 0, 50);
-
- deltnseg = bitstream_get (state, 3);
- j = 0;
- do {
- j += bitstream_get (state, 5);
- deltlen = bitstream_get (state, 4);
- delta = bitstream_get (state, 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->chincpl && state->cplba.bai >> 3) || /* cplinu, fsnroffst */
- (state->lfeon && state->lfeba.bai >> 3)) /* fsnroffst */
- return 0;
- for (i = 0; i < nfchans; i++)
- if (state->ba[i].bai >> 3) /* fsnroffst */
- return 0;
- return 1;
-}
-
-static inline int16_t dither_gen (a52_state_t * state)
-{
- int16_t nstate;
-
- nstate = dither_lut[state->lfsr_state >> 8] ^ (state->lfsr_state << 8);
-
- state->lfsr_state = (uint16_t) nstate;
-
- return (3 * nstate) >> 2;
-}
-
-#ifndef LIBA52_FIXED
-#define COEFF(c,t,l,s,e) (c) = (t) * (s)[e]
-#else
-#define COEFF(c,_t,_l,s,e) do { \
- quantizer_t t = (_t); \
- level_t l = (_l); \
- int shift = e - 5; \
- sample_t tmp = t * (l >> 16) + ((t * (l & 0xffff)) >> 16); \
- if (shift >= 0) \
- (c) = tmp >> shift; \
- else \
- (c) = tmp << -shift; \
-} while (0)
-#endif
-
-static void coeff_get (a52_state_t * state, sample_t * coeff,
- expbap_t * expbap, quantizer_set_t * quant,
- level_t level, int dither, int end)
-{
- int i;
- uint8_t * exp;
- int8_t * bap;
-
-#ifndef LIBA52_FIXED
- sample_t factor[25];
-
- for (i = 0; i <= 24; i++)
- factor[i] = scale_factor[i] * level;
-#endif
-
- exp = expbap->exp;
- bap = expbap->bap;
-
- for (i = 0; i < end; i++) {
- int bapi;
-
- bapi = bap[i];
- switch (bapi) {
- case 0:
- if (dither) {
- COEFF (coeff[i], dither_gen (state), level, factor, exp[i]);
- continue;
- } else {
- coeff[i] = 0;
- continue;
- }
-
- case -1:
- if (quant->q1_ptr >= 0) {
- COEFF (coeff[i], quant->q1[quant->q1_ptr--], level,
- factor, exp[i]);
- continue;
- } else {
- int code;
-
- code = bitstream_get (state, 5);
-
- quant->q1_ptr = 1;
- quant->q1[0] = q_1_2[code];
- quant->q1[1] = q_1_1[code];
- COEFF (coeff[i], q_1_0[code], level, factor, exp[i]);
- continue;
- }
-
- case -2:
- if (quant->q2_ptr >= 0) {
- COEFF (coeff[i], quant->q2[quant->q2_ptr--], level,
- factor, exp[i]);
- continue;
- } else {
- int code;
-
- code = bitstream_get (state, 7);
-
- quant->q2_ptr = 1;
- quant->q2[0] = q_2_2[code];
- quant->q2[1] = q_2_1[code];
- COEFF (coeff[i], q_2_0[code], level, factor, exp[i]);
- continue;
- }
-
- case 3:
- COEFF (coeff[i], q_3[bitstream_get (state, 3)], level,
- factor, exp[i]);
- continue;
-
- case -3:
- if (quant->q4_ptr == 0) {
- quant->q4_ptr = -1;
- COEFF (coeff[i], quant->q4, level, factor, exp[i]);
- continue;
- } else {
- int code;
-
- code = bitstream_get (state, 7);
-
- quant->q4_ptr = 0;
- quant->q4 = q_4_1[code];
- COEFF (coeff[i], q_4_0[code], level, factor, exp[i]);
- continue;
- }
-
- case 4:
- COEFF (coeff[i], q_5[bitstream_get (state, 4)], level,
- factor, exp[i]);
- continue;
-
- default:
- COEFF (coeff[i], bitstream_get_2 (state, bapi) << (16 - bapi),
- level, factor, exp[i]);
- }
- }
-}
-
-static void coeff_get_coupling (a52_state_t * state, int nfchans,
- level_t * coeff, sample_t (* samples)[256],
- quantizer_set_t * quant, uint8_t dithflag[5])
-{
- int cplbndstrc, bnd, i, i_end, ch;
- uint8_t * exp;
- int8_t * bap;
- level_t cplco[5];
-
- exp = state->cpl_expbap.exp;
- bap = state->cpl_expbap.bap;
- bnd = 0;
- cplbndstrc = state->cplbndstrc;
- i = state->cplstrtmant;
- while (i < state->cplendmant) {
- i_end = i + 12;
- while (cplbndstrc & 1) {
- cplbndstrc >>= 1;
- i_end += 12;
- }
- cplbndstrc >>= 1;
- for (ch = 0; ch < nfchans; ch++)
- cplco[ch] = MUL_L (state->cplco[ch][bnd], coeff[ch]);
- bnd++;
-
- while (i < i_end) {
- quantizer_t cplcoeff;
- int bapi;
-
- bapi = bap[i];
- switch (bapi) {
- case 0:
- for (ch = 0; ch < nfchans; ch++)
- if ((state->chincpl >> ch) & 1) {
- if (dithflag[ch])
-#ifndef LIBA52_FIXED
- samples[ch][i] = (scale_factor[exp[i]] *
- cplco[ch] * dither_gen (state));
-#else
- COEFF (samples[ch][i], dither_gen (state),
- cplco[ch], scale_factor, exp[i]);
-#endif
- else
- samples[ch][i] = 0;
- }
- i++;
- continue;
-
- case -1:
- if (quant->q1_ptr >= 0) {
- cplcoeff = quant->q1[quant->q1_ptr--];
- break;
- } else {
- int code;
-
- code = bitstream_get (state, 5);
-
- quant->q1_ptr = 1;
- quant->q1[0] = q_1_2[code];
- quant->q1[1] = q_1_1[code];
- cplcoeff = q_1_0[code];
- break;
- }
-
- case -2:
- if (quant->q2_ptr >= 0) {
- cplcoeff = quant->q2[quant->q2_ptr--];
- break;
- } else {
- int code;
-
- code = bitstream_get (state, 7);
-
- quant->q2_ptr = 1;
- quant->q2[0] = q_2_2[code];
- quant->q2[1] = q_2_1[code];
- cplcoeff = q_2_0[code];
- break;
- }
-
- case 3:
- cplcoeff = q_3[bitstream_get (state, 3)];
- break;
-
- case -3:
- if (quant->q4_ptr == 0) {
- quant->q4_ptr = -1;
- cplcoeff = quant->q4;
- break;
- } else {
- int code;
-
- code = bitstream_get (state, 7);
-
- quant->q4_ptr = 0;
- quant->q4 = q_4_1[code];
- cplcoeff = q_4_0[code];
- break;
- }
-
- case 4:
- cplcoeff = q_5[bitstream_get (state, 4)];
- break;
-
- default:
- cplcoeff = bitstream_get_2 (state, bapi) << (16 - bapi);
- }
-#ifndef LIBA52_FIXED
- cplcoeff *= scale_factor[exp[i]];
-#endif
- for (ch = 0; ch < nfchans; ch++)
- if ((state->chincpl >> ch) & 1)
-#ifndef LIBA52_FIXED
- samples[ch][i] = cplcoeff * cplco[ch];
-#else
- COEFF (samples[ch][i], cplcoeff, cplco[ch],
- scale_factor, exp[i]);
-#endif
- i++;
- }
- }
-}
-
-int a52_block (a52_state_t * state)
-{
- 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];
- level_t coeff[5];
- int chanbias;
- quantizer_set_t quant;
- sample_t * samples;
-
- nfchans = nfchans_tbl[state->acmod];
-
- for (i = 0; i < nfchans; i++)
- blksw[i] = bitstream_get (state, 1);
-
- for (i = 0; i < nfchans; i++)
- dithflag[i] = bitstream_get (state, 1);
-
- chaninfo = !state->acmod;
- do {
- if (bitstream_get (state, 1)) { /* dynrnge */
- int dynrng;
-
- dynrng = bitstream_get_2 (state, 8);
- if (state->dynrnge) {
- level_t range;
-
-#if !defined(LIBA52_FIXED)
- range = ((((dynrng & 0x1f) | 0x20) << 13) *
- scale_factor[3 - (dynrng >> 5)]);
-#else
- range = ((dynrng & 0x1f) | 0x20) << (21 + (dynrng >> 5));
-#endif
- if (state->dynrngcall)
- range = state->dynrngcall (range, state->dynrngdata);
- state->dynrng = MUL_L (state->level, range);
- }
- }
- } while (chaninfo--);
-
- if (bitstream_get (state, 1)) { /* cplstre */
- state->chincpl = 0;
- if (bitstream_get (state, 1)) { /* cplinu */
- static uint8_t 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 |= bitstream_get (state, 1) << i;
- switch (state->acmod) {
- case 0: case 1:
- return 1;
- case 2:
- state->phsflginu = bitstream_get (state, 1);
- }
- cplbegf = bitstream_get (state, 4);
- cplendf = bitstream_get (state, 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;
-
- state->cplbndstrc = 0;
- for (i = 0; i < ncplsubnd - 1; i++)
- if (bitstream_get (state, 1)) {
- state->cplbndstrc |= 1 << i;
- state->ncplbnd--;
- }
- }
- }
-
- if (state->chincpl) { /* cplinu */
- int j, cplcoe;
-
- cplcoe = 0;
- for (i = 0; i < nfchans; i++)
- if ((state->chincpl) >> i & 1)
- if (bitstream_get (state, 1)) { /* cplcoe */
- int mstrcplco, cplcoexp, cplcomant;
-
- cplcoe = 1;
- mstrcplco = 3 * bitstream_get (state, 2);
- for (j = 0; j < state->ncplbnd; j++) {
- cplcoexp = bitstream_get (state, 4);
- cplcomant = bitstream_get (state, 4);
- if (cplcoexp == 15)
- cplcomant <<= 14;
- else
- cplcomant = (cplcomant | 0x10) << 13;
-#ifndef LIBA52_FIXED
- state->cplco[i][j] =
- cplcomant * scale_factor[cplcoexp + mstrcplco];
-#else
- state->cplco[i][j] = (cplcomant << 11) >> (cplcoexp + mstrcplco);
-#endif
-
- }
- }
- if ((state->acmod == 2) && state->phsflginu && cplcoe)
- for (j = 0; j < state->ncplbnd; j++)
- if (bitstream_get (state, 1)) /* phsflg */
- state->cplco[1][j] = -state->cplco[1][j];
- }
-
- if ((state->acmod == 2) && (bitstream_get (state, 1))) { /* rematstr */
- int end;
-
- state->rematflg = 0;
- end = (state->chincpl) ? state->cplstrtmant : 253; /* cplinu */
- i = 0;
- do
- state->rematflg |= bitstream_get (state, 1) << i;
- while (rematrix_band[i++] < end);
- }
-
- cplexpstr = EXP_REUSE;
- lfeexpstr = EXP_REUSE;
- if (state->chincpl) /* cplinu */
- cplexpstr = bitstream_get (state, 2);
- for (i = 0; i < nfchans; i++)
- chexpstr[i] = bitstream_get (state, 2);
- if (state->lfeon)
- lfeexpstr = bitstream_get (state, 1);
-
- for (i = 0; i < nfchans; i++)
- if (chexpstr[i] != EXP_REUSE) {
- if ((state->chincpl >> i) & 1)
- state->endmant[i] = state->cplstrtmant;
- else {
- int chbwcod;
-
- chbwcod = bitstream_get (state, 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 (state, 4) << 1;
- if (parse_exponents (state, cplexpstr, ncplgrps, cplabsexp,
- state->cpl_expbap.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_expbap[i].exp[0] = bitstream_get (state, 4);
- if (parse_exponents (state, chexpstr[i], nchgrps,
- state->fbw_expbap[i].exp[0],
- state->fbw_expbap[i].exp + 1))
- return 1;
- bitstream_get (state, 2); /* gainrng */
- }
- if (lfeexpstr != EXP_REUSE) {
- do_bit_alloc |= 32;
- state->lfe_expbap.exp[0] = bitstream_get (state, 4);
- if (parse_exponents (state, lfeexpstr, 2, state->lfe_expbap.exp[0],
- state->lfe_expbap.exp + 1))
- return 1;
- }
-
- if (bitstream_get (state, 1)) { /* baie */
- do_bit_alloc = 127;
- state->bai = bitstream_get (state, 11);
- }
- if (bitstream_get (state, 1)) { /* snroffste */
- do_bit_alloc = 127;
- state->csnroffst = bitstream_get (state, 6);
- if (state->chincpl) /* cplinu */
- state->cplba.bai = bitstream_get (state, 7);
- for (i = 0; i < nfchans; i++)
- state->ba[i].bai = bitstream_get (state, 7);
- if (state->lfeon)
- state->lfeba.bai = bitstream_get (state, 7);
- }
- if ((state->chincpl) && (bitstream_get (state, 1))) { /* cplleake */
- do_bit_alloc |= 64;
- state->cplfleak = 9 - bitstream_get (state, 3);
- state->cplsleak = 9 - bitstream_get (state, 3);
- }
-
- if (bitstream_get (state, 1)) { /* deltbaie */
- do_bit_alloc = 127;
- if (state->chincpl) /* cplinu */
- state->cplba.deltbae = bitstream_get (state, 2);
- for (i = 0; i < nfchans; i++)
- state->ba[i].deltbae = bitstream_get (state, 2);
- if (state->chincpl && /* cplinu */
- (state->cplba.deltbae == DELTA_BIT_NEW) &&
- parse_deltba (state, state->cplba.deltba))
- return 1;
- for (i = 0; i < nfchans; i++)
- if ((state->ba[i].deltbae == DELTA_BIT_NEW) &&
- parse_deltba (state, state->ba[i].deltba))
- return 1;
- }
-
- if (do_bit_alloc) {
- if (zero_snr_offsets (nfchans, state)) {
- memset (state->cpl_expbap.bap, 0, sizeof (state->cpl_expbap.bap));
- for (i = 0; i < nfchans; i++)
- memset (state->fbw_expbap[i].bap, 0,
- sizeof (state->fbw_expbap[i].bap));
- memset (state->lfe_expbap.bap, 0, sizeof (state->lfe_expbap.bap));
- } else {
- if (state->chincpl && (do_bit_alloc & 64)) /* cplinu */
- a52_bit_allocate (state, &state->cplba, state->cplstrtbnd,
- state->cplstrtmant, state->cplendmant,
- state->cplfleak << 8, state->cplsleak << 8,
- &state->cpl_expbap);
- for (i = 0; i < nfchans; i++)
- if (do_bit_alloc & (1 << i))
- a52_bit_allocate (state, state->ba + i, 0, 0,
- state->endmant[i], 0, 0,
- state->fbw_expbap +i);
- if (state->lfeon && (do_bit_alloc & 32)) {
- state->lfeba.deltbae = DELTA_BIT_NONE;
- a52_bit_allocate (state, &state->lfeba, 0, 0, 7, 0, 0,
- &state->lfe_expbap);
- }
- }
- }
-
- if (bitstream_get (state, 1)) { /* skiple */
- i = bitstream_get (state, 9); /* skipl */
- while (i--)
- bitstream_get (state, 8);
- }
-
- samples = state->samples;
- if (state->output & A52_LFE)
- samples += 256; /* shift for LFE channel */
-
- chanbias = a52_downmix_coeff (coeff, state->acmod, state->output,
- state->dynrng, state->clev, state->slev);
-
- quant.q1_ptr = quant.q2_ptr = quant.q4_ptr = -1;
- done_cpl = 0;
-
- for (i = 0; i < nfchans; i++) {
- int j;
-
- coeff_get (state, samples + 256 * i, state->fbw_expbap +i, &quant,
- coeff[i], dithflag[i], state->endmant[i]);
-
- if ((state->chincpl >> i) & 1) {
- if (!done_cpl) {
- done_cpl = 1;
- coeff_get_coupling (state, nfchans, coeff,
- (sample_t (*)[256])samples, &quant,
- 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, rematflg;
-
- end = ((state->endmant[0] < state->endmant[1]) ?
- state->endmant[0] : state->endmant[1]);
-
- i = 0;
- j = 13;
- rematflg = state->rematflg;
- do {
- if (! (rematflg & 1)) {
- rematflg >>= 1;
- j = rematrix_band[i++];
- continue;
- }
- rematflg >>= 1;
- 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 (state, samples - 256, &state->lfe_expbap, &quant,
- state->dynrng, 0, 7);
- for (i = 7; i < 256; i++)
- (samples-256)[i] = 0;
- a52_imdct_512 (samples - 256, samples + 1536 - 256, state->bias);
- } else {
- /* just skip the LFE coefficients */
- coeff_get (state, samples + 1280, &state->lfe_expbap, &quant,
- 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 (state->downmixed) {
- state->downmixed = 0;
- a52_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])
- a52_imdct_256 (samples + 256 * i, samples + 1536 + 256 * i,
- bias);
- else
- a52_imdct_512 (samples + 256 * i, samples + 1536 + 256 * i,
- bias);
- } else {
- int j;
-
- for (j = 0; j < 256; j++)
- (samples + 256 * i)[j] = bias;
- }
- }
-
- a52_downmix (samples, state->acmod, state->output, state->bias,
- state->clev, state->slev);
- } else {
- nfchans = nfchans_tbl[state->output & A52_CHANNEL_MASK];
-
- a52_downmix (samples, state->acmod, state->output, 0,
- state->clev, state->slev);
-
- if (!state->downmixed) {
- state->downmixed = 1;
- a52_downmix (samples + 1536, state->acmod, state->output, 0,
- state->clev, state->slev);
- }
-
- if (blksw[0])
- for (i = 0; i < nfchans; i++)
- a52_imdct_256 (samples + 256 * i, samples + 1536 + 256 * i,
- state->bias);
- else
- for (i = 0; i < nfchans; i++)
- a52_imdct_512 (samples + 256 * i, samples + 1536 + 256 * i,
- state->bias);
- }
-
- return 0;
-}
-
-void a52_free (a52_state_t * state)
-{
- free (state->samples);
- free (state);
-}
projects / synfig.git / blobdiff