summaryrefslogtreecommitdiff
path: root/src/liba52/parse.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/liba52/parse.c')
-rw-r--r--src/liba52/parse.c513
1 files changed, 274 insertions, 239 deletions
diff --git a/src/liba52/parse.c b/src/liba52/parse.c
index e2be25d12..61dccb7f3 100644
--- a/src/liba52/parse.c
+++ b/src/liba52/parse.c
@@ -1,8 +1,10 @@
/*
* parse.c
- * Copyright (C) 1999-2001 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
+ * Copyright (C) 2000-2002 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
@@ -21,10 +23,9 @@
#include "config.h"
-#include <inttypes.h>
-#include <stdio.h> /* For printf */
#include <stdlib.h>
#include <string.h>
+#include <inttypes.h>
#include "a52.h"
#include "a52_internal.h"
@@ -32,35 +33,47 @@
#include "tables.h"
#include "xineutils.h"
-static sample_t q_1[2];
-static sample_t q_2[2];
-static sample_t q_4;
-static int q_1_pointer;
-static int q_2_pointer;
-static int q_4_pointer;
+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_base)
+a52_state_t * a52_init (uint32_t mm_accel)
{
- sample_t * samples;
+ a52_state_t * state;
int i;
- imdct_init (mm_accel);
-
- samples = xine_xmalloc_aligned (16, 256 * 12 * sizeof (sample_t),
- (void**) samples_base);
- if (samples == NULL) {
-
- printf ("liba52: samples malloc failed!\n");
+ state = malloc (sizeof (a52_state_t));
+ if (state == NULL)
+ return NULL;
+ state->samples = xine_xmalloc_aligned (16, 256 * 12 * sizeof (sample_t), &state->samples_base);
+ if (state->samples == NULL) {
+ free (state);
return NULL;
}
for (i = 0; i < 256 * 12; i++)
- samples[i] = 0;
+ state->samples[i] = 0;
+
+ state->downmixed = 1;
+
+ state->lfsr_state = 1;
+
+ a52_imdct_init (mm_accel);
- return samples;
+ return state;
+}
+
+sample_t * a52_samples (a52_state_t * state)
+{
+ return state->samples;
}
int a52_syncinfo (uint8_t * buf, int * flags,
@@ -94,7 +107,7 @@ int a52_syncinfo (uint8_t * buf, int * flags,
*bit_rate = (bitrate * 1000) >> half;
switch (buf[4] & 0xc0) {
- case 0: /* 48 KHz */
+ case 0:
*sample_rate = 48000 >> half;
return 4 * bitrate;
case 0x40:
@@ -120,57 +133,60 @@ int a52_frame (a52_state_t * state, uint8_t * buf, int * flags,
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 */
+ a52_bitstream_set_ptr (state, buf + 6);
+ bitstream_get (state, 3); /* skip acmod we already parsed */
- if ((acmod == 2) && (bitstream_get (2) == 2)) /* dsurmod */
+ if ((acmod == 2) && (bitstream_get (state, 2) == 2)) /* dsurmod */
acmod = A52_DOLBY;
if ((acmod & 1) && (acmod != 1))
- state->clev = clev[bitstream_get (2)]; /* cmixlev */
+ state->clev = clev[bitstream_get (state, 2)]; /* cmixlev */
if (acmod & 4)
- state->slev = slev[bitstream_get (2)]; /* surmixlev */
+ state->slev = slev[bitstream_get (state, 2)]; /* surmixlev */
- state->lfeon = bitstream_get (1);
+ state->lfeon = bitstream_get (state, 1);
- state->output = downmix_init (acmod, *flags, level,
- state->clev, state->slev);
+ 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
+ /* the 2* compensates for differences in imdct */
state->dynrng = state->level = 2 * *level;
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 (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 */
+ 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 (2); /* copyrightb + origbs */
+ bitstream_get (state, 2); /* copyrightb + origbs */
- if (bitstream_get (1)) /* timecod1e */
- bitstream_get (14); /* timecod1 */
- if (bitstream_get (1)) /* timecod2e */
- bitstream_get (14); /* timecod2 */
+ 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 (1)) { /* addbsie */
+ if (bitstream_get (state, 1)) { /* addbsie */
int addbsil;
- addbsil = bitstream_get (6);
+ addbsil = bitstream_get (state, 6);
do {
- bitstream_get (8); /* addbsi */
+ bitstream_get (state, 8); /* addbsi */
} while (addbsil--);
}
@@ -188,13 +204,13 @@ void a52_dynrng (a52_state_t * state,
}
}
-static int parse_exponents (int expstr, int ngrps, uint8_t exponent,
- uint8_t * dest)
+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 (7);
+ exps = bitstream_get (state, 7);
exponent += exp_1[exps];
if (exponent > 24)
@@ -242,18 +258,18 @@ static int parse_exponents (int expstr, int ngrps, uint8_t exponent,
return 0;
}
-static int parse_deltba (int8_t * deltba)
+static int parse_deltba (a52_state_t * state, int8_t * deltba)
{
int deltnseg, deltlen, delta, j;
memset (deltba, 0, 50);
- deltnseg = bitstream_get (3);
+ deltnseg = bitstream_get (state, 3);
j = 0;
do {
- j += bitstream_get (5);
- deltlen = bitstream_get (4);
- delta = bitstream_get (3);
+ j += bitstream_get (state, 5);
+ deltlen = bitstream_get (state, 4);
+ delta = bitstream_get (state, 3);
delta -= (delta >= 4) ? 3 : 4;
if (!deltlen)
continue;
@@ -270,36 +286,42 @@ 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))
+ 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].fsnroffst)
+ if (state->ba[i].bai >> 3) /* fsnroffst */
return 0;
return 1;
}
-static inline int16_t dither_gen (void)
+static inline int16_t dither_gen (a52_state_t * state)
{
- static uint16_t lfsr_state = 1;
- int16_t state;
+ int16_t nstate;
- state = dither_lut[lfsr_state >> 8] ^ (lfsr_state << 8);
+ nstate = dither_lut[state->lfsr_state >> 8] ^ (state->lfsr_state << 8);
- lfsr_state = (uint16_t) state;
+ state->lfsr_state = (uint16_t) nstate;
- return state;
+ return nstate;
}
-static void coeff_get (sample_t * coeff, uint8_t * exp, int8_t * bap,
+static void coeff_get (a52_state_t * state, sample_t * coeff,
+ expbap_t * expbap, quantizer_t * quantizer,
sample_t level, int dither, int end)
{
int i;
+ uint8_t * exp;
+ int8_t * bap;
sample_t factor[25];
for (i = 0; i <= 24; i++)
factor[i] = scale_factor[i] * level;
+ exp = expbap->exp;
+ bap = expbap->bap;
+
for (i = 0; i < end; i++) {
int bapi;
@@ -307,7 +329,7 @@ static void coeff_get (sample_t * coeff, uint8_t * exp, int8_t * bap,
switch (bapi) {
case 0:
if (dither) {
- coeff[i] = dither_gen() * LEVEL_3DB * factor[exp[i]];
+ coeff[i] = dither_gen (state) * LEVEL_3DB * factor[exp[i]];
continue;
} else {
coeff[i] = 0;
@@ -315,85 +337,89 @@ static void coeff_get (sample_t * coeff, uint8_t * exp, int8_t * bap,
}
case -1:
- if (q_1_pointer >= 0) {
- coeff[i] = q_1[q_1_pointer--] * factor[exp[i]];
+ if (quantizer->q1_ptr >= 0) {
+ coeff[i] = quantizer->q1[quantizer->q1_ptr--] * factor[exp[i]];
continue;
} else {
int code;
- code = bitstream_get (5);
+ code = bitstream_get (state, 5);
- q_1_pointer = 1;
- q_1[0] = q_1_2[code];
- q_1[1] = q_1_1[code];
+ 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 (q_2_pointer >= 0) {
- coeff[i] = q_2[q_2_pointer--] * factor[exp[i]];
+ if (quantizer->q2_ptr >= 0) {
+ coeff[i] = quantizer->q2[quantizer->q2_ptr--] * factor[exp[i]];
continue;
} else {
int code;
- code = bitstream_get (7);
+ code = bitstream_get (state, 7);
- q_2_pointer = 1;
- q_2[0] = q_2_2[code];
- q_2[1] = q_2_1[code];
+ 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]];
+ coeff[i] = q_3[bitstream_get (state, 3)] * factor[exp[i]];
continue;
case -3:
- if (q_4_pointer == 0) {
- q_4_pointer = -1;
- coeff[i] = q_4 * factor[exp[i]];
+ if (quantizer->q4_ptr == 0) {
+ quantizer->q4_ptr = -1;
+ coeff[i] = quantizer->q4 * factor[exp[i]];
continue;
} else {
int code;
- code = bitstream_get (7);
+ code = bitstream_get (state, 7);
- q_4_pointer = 0;
- q_4 = q_4_1[code];
+ 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]];
+ coeff[i] = q_5[bitstream_get (state, 4)] * factor[exp[i]];
continue;
default:
- coeff[i] = ((bitstream_get_2 (bapi) << (16 - bapi)) *
+ coeff[i] = ((bitstream_get_2 (state, bapi) << (16 - bapi)) *
factor[exp[i]]);
}
}
}
static void coeff_get_coupling (a52_state_t * state, int nfchans,
- sample_t * coeff,
- sample_t (* samples)[256], uint8_t dithflag[5])
+ 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;
+ int cplbndstrc, bnd, i, i_end, ch;
uint8_t * exp;
+ int8_t * bap;
sample_t cplco[5];
- bap = state->cpl_bap;
- exp = state->cpl_exp;
- sub_bnd = bnd = 0;
+ 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 (state->cplbndstrc[sub_bnd++])
+ while (cplbndstrc & 1) {
+ cplbndstrc >>= 1;
i_end += 12;
+ }
+ cplbndstrc >>= 1;
for (ch = 0; ch < nfchans; ch++)
cplco[ch] = state->cplco[ch][bnd] * coeff[ch];
bnd++;
@@ -407,10 +433,10 @@ static void coeff_get_coupling (a52_state_t * state, int nfchans,
case 0:
cplcoeff = LEVEL_3DB * scale_factor[exp[i]];
for (ch = 0; ch < nfchans; ch++)
- if (state->chincpl[ch]) {
+ if ((state->chincpl >> ch) & 1) {
if (dithflag[ch])
samples[ch][i] = (cplcoeff * cplco[ch] *
- dither_gen ());
+ dither_gen (state));
else
samples[ch][i] = 0;
}
@@ -418,75 +444,75 @@ static void coeff_get_coupling (a52_state_t * state, int nfchans,
continue;
case -1:
- if (q_1_pointer >= 0) {
- cplcoeff = q_1[q_1_pointer--];
+ if (quantizer->q1_ptr >= 0) {
+ cplcoeff = quantizer->q1[quantizer->q1_ptr--];
break;
} else {
int code;
- code = bitstream_get (5);
+ code = bitstream_get (state, 5);
- q_1_pointer = 1;
- q_1[0] = q_1_2[code];
- q_1[1] = q_1_1[code];
+ 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 (q_2_pointer >= 0) {
- cplcoeff = q_2[q_2_pointer--];
+ if (quantizer->q2_ptr >= 0) {
+ cplcoeff = quantizer->q2[quantizer->q2_ptr--];
break;
} else {
int code;
- code = bitstream_get (7);
+ code = bitstream_get (state, 7);
- q_2_pointer = 1;
- q_2[0] = q_2_2[code];
- q_2[1] = q_2_1[code];
+ 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)];
+ cplcoeff = q_3[bitstream_get (state, 3)];
break;
case -3:
- if (q_4_pointer == 0) {
- q_4_pointer = -1;
- cplcoeff = q_4;
+ if (quantizer->q4_ptr == 0) {
+ quantizer->q4_ptr = -1;
+ cplcoeff = quantizer->q4;
break;
} else {
int code;
- code = bitstream_get (7);
+ code = bitstream_get (state, 7);
- q_4_pointer = 0;
- q_4 = q_4_1[code];
+ quantizer->q4_ptr = 0;
+ quantizer->q4 = q_4_1[code];
cplcoeff = q_4_0[code];
break;
}
case 4:
- cplcoeff = q_5[bitstream_get (4)];
+ cplcoeff = q_5[bitstream_get (state, 4)];
break;
default:
- cplcoeff = bitstream_get_2 (bapi) << (16 - bapi);
+ cplcoeff = bitstream_get_2 (state, bapi) << (16 - bapi);
}
cplcoeff *= scale_factor[exp[i]];
for (ch = 0; ch < nfchans; ch++)
- if (state->chincpl[ch])
+ if ((state->chincpl >> ch) & 1)
samples[ch][i] = cplcoeff * cplco[ch];
i++;
}
}
}
-int a52_block (a52_state_t * state, sample_t * samples)
+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};
@@ -495,21 +521,23 @@ int a52_block (a52_state_t * state, sample_t * samples)
uint8_t blksw[5], dithflag[5];
sample_t coeff[5];
int chanbias;
+ quantizer_t quantizer;
+ sample_t * samples;
nfchans = nfchans_tbl[state->acmod];
for (i = 0; i < nfchans; i++)
- blksw[i] = bitstream_get (1);
+ blksw[i] = bitstream_get (state, 1);
for (i = 0; i < nfchans; i++)
- dithflag[i] = bitstream_get (1);
+ dithflag[i] = bitstream_get (state, 1);
- chaninfo = !(state->acmod);
+ chaninfo = !state->acmod;
do {
- if (bitstream_get (1)) { /* dynrnge */
+ if (bitstream_get (state, 1)) { /* dynrnge */
int dynrng;
- dynrng = bitstream_get_2 (8);
+ dynrng = bitstream_get_2 (state, 8);
if (state->dynrnge) {
sample_t range;
@@ -522,25 +550,25 @@ int a52_block (a52_state_t * state, sample_t * samples)
}
} 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};
+ 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[i] = bitstream_get (1);
+ state->chincpl |= bitstream_get (state, 1) << i;
switch (state->acmod) {
case 0: case 1:
return 1;
case 2:
- state->phsflginu = bitstream_get (1);
+ state->phsflginu = bitstream_get (state, 1);
}
- cplbegf = bitstream_get (4);
- cplendf = bitstream_get (4);
+ cplbegf = bitstream_get (state, 4);
+ cplendf = bitstream_get (state, 4);
if (cplendf + 3 - cplbegf < 0)
return 1;
@@ -549,28 +577,29 @@ int a52_block (a52_state_t * state, sample_t * samples)
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 */
+ state->cplbndstrc = 0;
+ for (i = 0; i < ncplsubnd - 1; i++)
+ if (bitstream_get (state, 1)) {
+ state->cplbndstrc |= 1 << i;
+ state->ncplbnd--;
+ }
}
}
- if (state->cplinu) {
+ if (state->chincpl) { /* cplinu */
int j, cplcoe;
cplcoe = 0;
for (i = 0; i < nfchans; i++)
- if (state->chincpl[i])
- if (bitstream_get (1)) { /* cplcoe */
+ if ((state->chincpl) >> i & 1)
+ if (bitstream_get (state, 1)) { /* cplcoe */
int mstrcplco, cplcoexp, cplcomant;
cplcoe = 1;
- mstrcplco = 3 * bitstream_get (2);
+ mstrcplco = 3 * bitstream_get (state, 2);
for (j = 0; j < state->ncplbnd; j++) {
- cplcoexp = bitstream_get (4);
- cplcomant = bitstream_get (4);
+ cplcoexp = bitstream_get (state, 4);
+ cplcomant = bitstream_get (state, 4);
if (cplcoexp == 15)
cplcomant <<= 14;
else
@@ -581,37 +610,38 @@ int a52_block (a52_state_t * state, sample_t * samples)
}
if ((state->acmod == 2) && state->phsflginu && cplcoe)
for (j = 0; j < state->ncplbnd; j++)
- if (bitstream_get (1)) /* phsflg */
+ if (bitstream_get (state, 1)) /* phsflg */
state->cplco[1][j] = -state->cplco[1][j];
}
- if ((state->acmod == 2) && (bitstream_get (1))) { /* rematstr */
+ if ((state->acmod == 2) && (bitstream_get (state, 1))) { /* rematstr */
int end;
- end = (state->cplinu) ? state->cplstrtmant : 253;
+ state->rematflg = 0;
+ end = (state->chincpl) ? state->cplstrtmant : 253; /* cplinu */
i = 0;
do
- state->rematflg[i] = bitstream_get (1);
+ state->rematflg |= bitstream_get (state, 1) << i;
while (rematrix_band[i++] < end);
}
cplexpstr = EXP_REUSE;
lfeexpstr = EXP_REUSE;
- if (state->cplinu)
- cplexpstr = bitstream_get (2);
+ if (state->chincpl) /* cplinu */
+ cplexpstr = bitstream_get (state, 2);
for (i = 0; i < nfchans; i++)
- chexpstr[i] = bitstream_get (2);
+ chexpstr[i] = bitstream_get (state, 2);
if (state->lfeon)
- lfeexpstr = bitstream_get (1);
+ lfeexpstr = bitstream_get (state, 1);
for (i = 0; i < nfchans; i++)
if (chexpstr[i] != EXP_REUSE) {
- if (state->cplinu && state->chincpl[i])
+ if ((state->chincpl >> i) & 1)
state->endmant[i] = state->cplstrtmant;
else {
int chbwcod;
- chbwcod = bitstream_get (6);
+ chbwcod = bitstream_get (state, 6);
if (chbwcod > 60)
return 1;
state->endmant[i] = chbwcod * 3 + 73;
@@ -626,9 +656,9 @@ int a52_block (a52_state_t * state, sample_t * samples)
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))
+ 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++)
@@ -638,115 +668,111 @@ int a52_block (a52_state_t * state, sample_t * samples)
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))
+ 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 (2); /* gainrng */
+ bitstream_get (state, 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))
+ 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 (1)) { /* baie */
+ if (bitstream_get (state, 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);
+ state->bai = bitstream_get (state, 11);
}
- if (bitstream_get (1)) { /* snroffste */
+ if (bitstream_get (state, 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);
- }
+ 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->cplinu) && (bitstream_get (1))) { /* cplleake */
+ if ((state->chincpl) && (bitstream_get (state, 1))) { /* cplleake */
do_bit_alloc |= 64;
- state->cplfleak = 2304 - (bitstream_get (3) << 8);
- state->cplsleak = 2304 - (bitstream_get (3) << 8);
+ state->cplfleak = 9 - bitstream_get (state, 3);
+ state->cplsleak = 9 - bitstream_get (state, 3);
}
- if (bitstream_get (1)) { /* deltbaie */
+ if (bitstream_get (state, 1)) { /* deltbaie */
do_bit_alloc = -1;
- if (state->cplinu)
- state->cplba.deltbae = bitstream_get (2);
+ if (state->chincpl) /* cplinu */
+ state->cplba.deltbae = bitstream_get (state, 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))
+ 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->ba[i].deltba))
+ parse_deltba (state, 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));
+ 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->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);
+ 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))
- bit_allocate (state, state->ba + i, 0, 0,
- state->endmant[i], 0, 0, state->fbw_exp[i],
- state->fbw_bap[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;
- bit_allocate (state, &state->lfeba, 0, 0, 7, 0, 0,
- state->lfe_exp, state->lfe_bap);
+ a52_bit_allocate (state, &state->lfeba, 0, 0, 7, 0, 0,
+ &state->lfe_expbap);
}
}
}
- if (bitstream_get (1)) { /* skiple */
- i = bitstream_get (9); /* skipl */
+ if (bitstream_get (state, 1)) { /* skiple */
+ i = bitstream_get (state, 9); /* skipl */
while (i--)
- bitstream_get (8);
+ bitstream_get (state, 8);
}
+ samples = state->samples;
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);
+ chanbias = a52_downmix_coeff (coeff, state->acmod, state->output,
+ state->dynrng, state->clev, state->slev);
- q_1_pointer = q_2_pointer = q_4_pointer = -1;
+ 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],
+ coeff_get (state, samples + 256 * i, state->fbw_expbap +i, &quantizer,
coeff[i], dithflag[i], state->endmant[i]);
- if (state->cplinu && state->chincpl[i]) {
+ if ((state->chincpl >> i) & 1) {
if (!done_cpl) {
done_cpl = 1;
coeff_get_coupling (state, nfchans, coeff,
- (sample_t (*)[256])samples, dithflag);
+ (sample_t (*)[256])samples, &quantizer,
+ dithflag);
}
j = state->cplendmant;
} else
@@ -757,18 +783,21 @@ int a52_block (a52_state_t * state, sample_t * samples)
}
if (state->acmod == 2) {
- int j, end, band;
+ 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 (!state->rematflg[i]) {
+ if (! (rematflg & 1)) {
+ rematflg >>= 1;
j = rematrix_band[i++];
continue;
}
+ rematflg >>= 1;
band = rematrix_band[i++];
if (band > end)
band = end;
@@ -785,14 +814,14 @@ int a52_block (a52_state_t * state, sample_t * samples)
if (state->lfeon) {
if (state->output & A52_LFE) {
- coeff_get (samples - 256, state->lfe_exp, state->lfe_bap,
+ coeff_get (state, samples - 256, &state->lfe_expbap, &quantizer,
state->dynrng, 0, 7);
for (i = 7; i < 256; i++)
(samples-256)[i] = 0;
- imdct_512 (samples - 256, samples + 1536 - 256, state->bias);
+ a52_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,
+ coeff_get (state, samples + 1280, &state->lfe_expbap, &quantizer,
0, 0, 7);
}
}
@@ -804,9 +833,9 @@ int a52_block (a52_state_t * state, sample_t * samples)
break;
if (i < nfchans) {
- if (samples[2 * 1536 - 1] == (sample_t)0x776b6e21) {
- samples[2 * 1536 - 1] = 0;
- upmix (samples + 1536, state->acmod, state->output);
+ if (state->downmixed) {
+ state->downmixed = 0;
+ a52_upmix (samples + 1536, state->acmod, state->output);
}
for (i = 0; i < nfchans; i++) {
@@ -818,11 +847,11 @@ int a52_block (a52_state_t * state, sample_t * samples)
if (coeff[i]) {
if (blksw[i])
- imdct_256 (samples + 256 * i, samples + 1536 + 256 * i,
- bias);
+ a52_imdct_256 (samples + 256 * i, samples + 1536 + 256 * i,
+ bias);
else
- imdct_512 (samples + 256 * i, samples + 1536 + 256 * i,
- bias);
+ a52_imdct_512 (samples + 256 * i, samples + 1536 + 256 * i,
+ bias);
} else {
int j;
@@ -831,29 +860,35 @@ int a52_block (a52_state_t * state, sample_t * samples)
}
}
- downmix (samples, state->acmod, state->output, state->bias,
- state->clev, state->slev);
+ a52_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,
+ a52_downmix (samples, state->acmod, state->output, 0,
state->clev, state->slev);
- samples[2 * 1536 - 1] = (sample_t)0x776b6e21;
+
+ 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++)
- imdct_256 (samples + 256 * i, samples + 1536 + 256 * i,
- state->bias);
+ a52_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);
+ a52_imdct_512 (samples + 256 * i, samples + 1536 + 256 * i,
+ state->bias);
}
return 0;
}
+
+void a52_free (a52_state_t * state)
+{
+ free (state->samples_base);
+ free (state);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-27 02:26:34 +0000