summaryrefslogtreecommitdiffstats
path: root/liba52/parse.c
diff options
context:
space:
mode:
Diffstat (limited to 'liba52/parse.c')
-rw-r--r--liba52/parse.c867
1 files changed, 867 insertions, 0 deletions
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 <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 "config.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <inttypes.h>
+
+#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;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-20 23:27:13 +0000