mirror of
https://github.com/mpv-player/mpv
synced 2024-12-14 19:05:33 +00:00
247ca52f00
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@4055 b3059339-0415-0410-9bf9-f77b7e298cf2
869 lines
21 KiB
C
869 lines
21 KiB
C
/*
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* parse.c
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* Copyright (C) 2000-2001 Michel Lespinasse <walken@zoy.org>
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* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
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*
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* This file is part of a52dec, a free ATSC A-52 stream decoder.
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* See http://liba52.sourceforge.net/ for updates.
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*
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* a52dec is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* a52dec is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include "a52.h"
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#include "a52_internal.h"
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#include "bitstream.h"
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#include "tables.h"
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#ifdef HAVE_MEMALIGN
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/* some systems have memalign() but no declaration for it */
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void * memalign (size_t align, size_t size);
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#else
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/* assume malloc alignment is sufficient */
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#define memalign(align,size) malloc (size)
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#endif
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typedef struct {
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sample_t q1[2];
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sample_t q2[2];
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sample_t q4;
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int q1_ptr;
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int q2_ptr;
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int q4_ptr;
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} quantizer_t;
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static uint8_t halfrate[12] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3};
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sample_t * a52_init (uint32_t mm_accel)
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{
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sample_t * samples;
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int i;
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imdct_init (mm_accel);
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downmix_accel_init(mm_accel);
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samples = memalign (16, 256 * 12 * sizeof (sample_t));
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if (samples == NULL)
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return NULL;
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for (i = 0; i < 256 * 12; i++)
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samples[i] = 0;
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return samples;
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}
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int a52_syncinfo (uint8_t * buf, int * flags,
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int * sample_rate, int * bit_rate)
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{
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static int rate[] = { 32, 40, 48, 56, 64, 80, 96, 112,
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128, 160, 192, 224, 256, 320, 384, 448,
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512, 576, 640};
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static uint8_t lfeon[8] = {0x10, 0x10, 0x04, 0x04, 0x04, 0x01, 0x04, 0x01};
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int frmsizecod;
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int bitrate;
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int half;
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int acmod;
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if ((buf[0] != 0x0b) || (buf[1] != 0x77)) /* syncword */
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return 0;
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if (buf[5] >= 0x60) /* bsid >= 12 */
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return 0;
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half = halfrate[buf[5] >> 3];
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/* acmod, dsurmod and lfeon */
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acmod = buf[6] >> 5;
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*flags = ((((buf[6] & 0xf8) == 0x50) ? A52_DOLBY : acmod) |
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((buf[6] & lfeon[acmod]) ? A52_LFE : 0));
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frmsizecod = buf[4] & 63;
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if (frmsizecod >= 38)
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return 0;
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bitrate = rate [frmsizecod >> 1];
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*bit_rate = (bitrate * 1000) >> half;
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switch (buf[4] & 0xc0) {
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case 0: /* 48 KHz */
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*sample_rate = 48000 >> half;
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return 4 * bitrate;
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case 0x40:
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*sample_rate = 44100 >> half;
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return 2 * (320 * bitrate / 147 + (frmsizecod & 1));
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case 0x80:
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*sample_rate = 32000 >> half;
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return 6 * bitrate;
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default:
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return 0;
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}
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}
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int a52_frame (a52_state_t * state, uint8_t * buf, int * flags,
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sample_t * level, sample_t bias)
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{
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static sample_t clev[4] = {LEVEL_3DB, LEVEL_45DB, LEVEL_6DB, LEVEL_45DB};
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static sample_t slev[4] = {LEVEL_3DB, LEVEL_6DB, 0, LEVEL_6DB};
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int chaninfo;
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int acmod;
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state->fscod = buf[4] >> 6;
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state->halfrate = halfrate[buf[5] >> 3];
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state->acmod = acmod = buf[6] >> 5;
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bitstream_set_ptr (buf + 6);
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bitstream_skip (3); /* skip acmod we already parsed */
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if ((acmod == 2) && (bitstream_get (2) == 2)) /* dsurmod */
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acmod = A52_DOLBY;
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if ((acmod & 1) && (acmod != 1))
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state->clev = clev[bitstream_get (2)]; /* cmixlev */
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if (acmod & 4)
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state->slev = slev[bitstream_get (2)]; /* surmixlev */
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state->lfeon = bitstream_get (1);
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state->output = downmix_init (acmod, *flags, level,
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state->clev, state->slev);
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if (state->output < 0)
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return 1;
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if (state->lfeon && (*flags & A52_LFE))
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state->output |= A52_LFE;
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*flags = state->output;
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/* the 2* compensates for differences in imdct */
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state->dynrng = state->level = 2 * *level;
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state->bias = bias;
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state->dynrnge = 1;
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state->dynrngcall = NULL;
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chaninfo = !acmod;
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do {
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bitstream_skip (5); /* dialnorm */
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if (bitstream_get (1)) /* compre */
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bitstream_skip (8); /* compr */
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if (bitstream_get (1)) /* langcode */
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bitstream_skip (8); /* langcod */
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if (bitstream_get (1)) /* audprodie */
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bitstream_skip (7); /* mixlevel + roomtyp */
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} while (chaninfo--);
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bitstream_skip (2); /* copyrightb + origbs */
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if (bitstream_get (1)) /* timecod1e */
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bitstream_skip (14); /* timecod1 */
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if (bitstream_get (1)) /* timecod2e */
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bitstream_skip (14); /* timecod2 */
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if (bitstream_get (1)) { /* addbsie */
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int addbsil;
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addbsil = bitstream_get (6);
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do {
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bitstream_skip (8); /* addbsi */
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} while (addbsil--);
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}
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return 0;
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}
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void a52_dynrng (a52_state_t * state,
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sample_t (* call) (sample_t, void *), void * data)
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{
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state->dynrnge = 0;
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if (call) {
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state->dynrnge = 1;
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state->dynrngcall = call;
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state->dynrngdata = data;
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}
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}
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static int parse_exponents (int expstr, int ngrps, uint8_t exponent,
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uint8_t * dest)
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{
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int exps;
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while (ngrps--) {
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exps = bitstream_get (7);
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exponent += exp_1[exps];
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if (exponent > 24)
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return 1;
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switch (expstr) {
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case EXP_D45:
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*(dest++) = exponent;
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*(dest++) = exponent;
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case EXP_D25:
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*(dest++) = exponent;
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case EXP_D15:
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*(dest++) = exponent;
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}
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exponent += exp_2[exps];
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if (exponent > 24)
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return 1;
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switch (expstr) {
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case EXP_D45:
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*(dest++) = exponent;
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*(dest++) = exponent;
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case EXP_D25:
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*(dest++) = exponent;
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case EXP_D15:
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*(dest++) = exponent;
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}
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exponent += exp_3[exps];
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if (exponent > 24)
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return 1;
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switch (expstr) {
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case EXP_D45:
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*(dest++) = exponent;
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*(dest++) = exponent;
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case EXP_D25:
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*(dest++) = exponent;
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case EXP_D15:
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*(dest++) = exponent;
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}
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}
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return 0;
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}
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static int parse_deltba (int8_t * deltba)
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{
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int deltnseg, deltlen, delta, j;
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memset (deltba, 0, 50);
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deltnseg = bitstream_get (3);
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j = 0;
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do {
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j += bitstream_get (5);
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deltlen = bitstream_get (4);
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delta = bitstream_get (3);
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delta -= (delta >= 4) ? 3 : 4;
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if (!deltlen)
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continue;
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if (j + deltlen >= 50)
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return 1;
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while (deltlen--)
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deltba[j++] = delta;
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} while (deltnseg--);
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return 0;
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}
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static inline int zero_snr_offsets (int nfchans, a52_state_t * state)
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{
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int i;
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if ((state->csnroffst) || (state->cplinu && state->cplba.fsnroffst) ||
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(state->lfeon && state->lfeba.fsnroffst))
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return 0;
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for (i = 0; i < nfchans; i++)
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if (state->ba[i].fsnroffst)
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return 0;
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return 1;
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}
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static inline int16_t dither_gen (void)
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{
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static uint16_t lfsr_state = 1;
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int16_t state;
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state = dither_lut[lfsr_state >> 8] ^ (lfsr_state << 8);
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lfsr_state = (uint16_t) state;
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return state;
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}
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static void coeff_get (sample_t * coeff, uint8_t * exp, int8_t * bap,
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quantizer_t * quantizer, sample_t level,
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int dither, int end)
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{
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int i;
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sample_t factor[25];
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for (i = 0; i <= 24; i++)
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factor[i] = scale_factor[i] * level;
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for (i = 0; i < end; i++) {
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int bapi;
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bapi = bap[i];
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switch (bapi) {
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case 0:
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if (dither) {
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coeff[i] = dither_gen() * LEVEL_3DB * factor[exp[i]];
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continue;
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} else {
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coeff[i] = 0;
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continue;
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}
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case -1:
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if (quantizer->q1_ptr >= 0) {
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coeff[i] = quantizer->q1[quantizer->q1_ptr--] * factor[exp[i]];
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continue;
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} else {
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int code;
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code = bitstream_get (5);
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quantizer->q1_ptr = 1;
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quantizer->q1[0] = q_1_2[code];
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quantizer->q1[1] = q_1_1[code];
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coeff[i] = q_1_0[code] * factor[exp[i]];
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continue;
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}
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case -2:
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if (quantizer->q2_ptr >= 0) {
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coeff[i] = quantizer->q2[quantizer->q2_ptr--] * factor[exp[i]];
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continue;
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} else {
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int code;
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code = bitstream_get (7);
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quantizer->q2_ptr = 1;
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quantizer->q2[0] = q_2_2[code];
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quantizer->q2[1] = q_2_1[code];
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coeff[i] = q_2_0[code] * factor[exp[i]];
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continue;
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}
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case 3:
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coeff[i] = q_3[bitstream_get (3)] * factor[exp[i]];
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continue;
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case -3:
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if (quantizer->q4_ptr == 0) {
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quantizer->q4_ptr = -1;
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coeff[i] = quantizer->q4 * factor[exp[i]];
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continue;
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} else {
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int code;
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code = bitstream_get (7);
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quantizer->q4_ptr = 0;
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quantizer->q4 = q_4_1[code];
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coeff[i] = q_4_0[code] * factor[exp[i]];
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continue;
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}
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case 4:
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coeff[i] = q_5[bitstream_get (4)] * factor[exp[i]];
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continue;
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default:
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coeff[i] = ((bitstream_get_2 (bapi) << (16 - bapi)) *
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factor[exp[i]]);
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}
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}
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}
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static void coeff_get_coupling (a52_state_t * state, int nfchans,
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sample_t * coeff, sample_t (* samples)[256],
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quantizer_t * quantizer, uint8_t dithflag[5])
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{
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int sub_bnd, bnd, i, i_end, ch;
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int8_t * bap;
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uint8_t * exp;
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sample_t cplco[5];
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bap = state->cpl_bap;
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exp = state->cpl_exp;
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sub_bnd = bnd = 0;
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i = state->cplstrtmant;
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while (i < state->cplendmant) {
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i_end = i + 12;
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while (state->cplbndstrc[sub_bnd++])
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i_end += 12;
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for (ch = 0; ch < nfchans; ch++)
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cplco[ch] = state->cplco[ch][bnd] * coeff[ch];
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bnd++;
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while (i < i_end) {
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sample_t cplcoeff;
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int bapi;
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bapi = bap[i];
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switch (bapi) {
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case 0:
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cplcoeff = LEVEL_3DB * scale_factor[exp[i]];
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for (ch = 0; ch < nfchans; ch++)
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if (state->chincpl[ch]) {
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if (dithflag[ch])
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samples[ch][i] = (cplcoeff * cplco[ch] *
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dither_gen ());
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else
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samples[ch][i] = 0;
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}
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i++;
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continue;
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case -1:
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if (quantizer->q1_ptr >= 0) {
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cplcoeff = quantizer->q1[quantizer->q1_ptr--];
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break;
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} else {
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int code;
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code = bitstream_get (5);
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quantizer->q1_ptr = 1;
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quantizer->q1[0] = q_1_2[code];
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quantizer->q1[1] = q_1_1[code];
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cplcoeff = q_1_0[code];
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break;
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}
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case -2:
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if (quantizer->q2_ptr >= 0) {
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cplcoeff = quantizer->q2[quantizer->q2_ptr--];
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break;
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} else {
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int code;
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code = bitstream_get (7);
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quantizer->q2_ptr = 1;
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quantizer->q2[0] = q_2_2[code];
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quantizer->q2[1] = q_2_1[code];
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cplcoeff = q_2_0[code];
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break;
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}
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case 3:
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cplcoeff = q_3[bitstream_get (3)];
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break;
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case -3:
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if (quantizer->q4_ptr == 0) {
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quantizer->q4_ptr = -1;
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cplcoeff = quantizer->q4;
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break;
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} else {
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int code;
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code = bitstream_get (7);
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quantizer->q4_ptr = 0;
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quantizer->q4 = q_4_1[code];
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cplcoeff = q_4_0[code];
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break;
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}
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case 4:
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cplcoeff = q_5[bitstream_get (4)];
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break;
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default:
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cplcoeff = bitstream_get_2 (bapi) << (16 - bapi);
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}
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cplcoeff *= scale_factor[exp[i]];
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for (ch = 0; ch < nfchans; ch++)
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if (state->chincpl[ch])
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samples[ch][i] = cplcoeff * cplco[ch];
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i++;
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}
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}
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}
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int a52_block (a52_state_t * state, sample_t * samples)
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{
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static const uint8_t nfchans_tbl[] = {2, 1, 2, 3, 3, 4, 4, 5, 1, 1, 2};
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static int rematrix_band[4] = {25, 37, 61, 253};
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int i, nfchans, chaninfo;
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uint8_t cplexpstr, chexpstr[5], lfeexpstr, do_bit_alloc, done_cpl;
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uint8_t blksw[5], dithflag[5];
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sample_t coeff[5];
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int chanbias;
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quantizer_t quantizer;
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nfchans = nfchans_tbl[state->acmod];
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for (i = 0; i < nfchans; i++)
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blksw[i] = bitstream_get (1);
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for (i = 0; i < nfchans; i++)
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dithflag[i] = bitstream_get (1);
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chaninfo = !(state->acmod);
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do {
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if (bitstream_get (1)) { /* dynrnge */
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int dynrng;
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dynrng = bitstream_get_2 (8);
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if (state->dynrnge) {
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sample_t range;
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|
|
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_skip (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_skip (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;
|
|
}
|