Initial import of the unmodified version of liba52-0.7.5-cvs, checked out of the Sourceforge CVS repository today.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5970 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 946 insertions, 0 deletions

diff --git a/apps/codecs/liba52/parse.c b/apps/codecs/liba52/parse.c
new file mode 100644
index 0000000000..505a335f09
--- /dev/null
+++ b/apps/codecs/liba52/parse.c
@@ -0,0 +1,946 @@
+/*
+ * 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 "config.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <inttypes.h>
+
+#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);
+}