3
* mpadec - MPEG audio decoder
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* Copyright (C) 2002-2004 Dmitriy Startsev (dstartsev@rambler.ru)
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* This library 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 GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; 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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/* $Id: layer3.c,v 1.3 2009/03/01 15:27:05 jpff Exp $ */
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#include "mpadec_internal.h"
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extern const uint32_t bitmask[17];
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extern bandinfo_t band_info[];
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extern newhuff_t hufft[], hufftc[];
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extern const MYFLT newcos[8];
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extern const MYFLT tfcos36[9];
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extern const MYFLT tfcos12[3];
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extern const MYFLT cs[8];
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extern const MYFLT ca[8];
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extern uint32_t getbits(mpadec_t mpadec, unsigned n);
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extern uint16_t update_crc(uint16_t init, uint8_t *buf, int length);
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static int decode_layer3_sideinfo(mpadec_t mpadec)
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register struct mpadec_t *mpa = (struct mpadec_t *)mpadec;
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int ch, gr, ms_stereo, powdiff, databits = 0;
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static const uint8_t tabs[2][5] = { { 2, 9, 5, 3, 4 }, { 1, 8, 1, 2, 9 } };
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const uint8_t *tab = tabs[mpa->frame.LSF];
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ms_stereo = ((mpa->frame.mode == MPG_MD_JOINT_STEREO) &&
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(mpa->frame.mode_ext & 2));
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powdiff = ((mpa->frame.channels > 1) &&
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(mpa->config.mode == MPADEC_CONFIG_MONO)) ? 4 : 0;
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mpa->sideinfo.main_data_begin = GETBITS(tab[1]);
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if (mpa->frame.channels == 1) mpa->sideinfo.private_bits = GETBITS(tab[2]);
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else mpa->sideinfo.private_bits = GETBITS(tab[3]);
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if (!mpa->frame.LSF) {
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for (ch = 0; ch < mpa->frame.channels; ch++) {
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mpa->sideinfo.ch[ch].gr[0].scfsi = -1;
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mpa->sideinfo.ch[ch].gr[1].scfsi = GETBITS(4);
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for (gr = 0; gr < tab[0]; gr++) {
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for (ch = 0; ch < mpa->frame.channels; ch++) {
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register grinfo_t *grinfo = &mpa->sideinfo.ch[ch].gr[gr];
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grinfo->part2_3_length = GETBITS(12);
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grinfo->big_values = GETBITS(9);
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databits += grinfo->part2_3_length;
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if (grinfo->big_values > 288) grinfo->big_values = 288;
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grinfo->pow2gain = mpa->tables.gainpow2 + 256 - GETBITS(8) + powdiff;
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if (ms_stereo) grinfo->pow2gain += 2;
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grinfo->scalefac_compress = GETBITS(tab[4]);
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grinfo->block_type = (uint8_t)GETBITS(2);
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grinfo->mixed_block_flag = (uint8_t)GETBITS(1);
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grinfo->table_select[0] = GETBITS(5);
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grinfo->table_select[1] = GETBITS(5);
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grinfo->table_select[2] = 0;
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grinfo->full_gain[0] = grinfo->pow2gain + (GETBITS(3) << 3);
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grinfo->full_gain[1] = grinfo->pow2gain + (GETBITS(3) << 3);
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grinfo->full_gain[2] = grinfo->pow2gain + (GETBITS(3) << 3);
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if (!grinfo->block_type) {
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} else mpa->error = FALSE;
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if (grinfo->block_type == 2) {
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if (grinfo->mixed_block_flag) {
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if (mpa->frame.frequency_index == 8) grinfo->region1start = 48;
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else grinfo->region1start = 48 >> 1;
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if (mpa->frame.frequency_index == 8) grinfo->region1start = 36;
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else grinfo->region1start = 36 >> 1;
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if (mpa->frame.frequency_index == 8) grinfo->region1start = 54;
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else grinfo->region1start = 54 >> 1;
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} else grinfo->region1start = 36 >> 1;
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grinfo->region2start = 576 >> 1;
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grinfo->block_type = 0;
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grinfo->mixed_block_flag = 0;
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grinfo->table_select[0] = GETBITS(5);
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grinfo->table_select[1] = GETBITS(5);
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grinfo->table_select[2] = GETBITS(5);
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register int tmp = GETBITS(4);
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grinfo->region1start =
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band_info[mpa->frame.frequency_index].long_idx[tmp + 1] >> 1;
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grinfo->region2start =
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band_info[mpa->frame.frequency_index].long_idx[tmp + 2] >> 1;
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if (!mpa->frame.LSF) grinfo->preflag = (uint8_t)GETBITS(1);
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grinfo->scalefac_scale = (uint8_t)GETBITS(1);
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grinfo->count1table_select = (uint8_t)GETBITS(1);
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databits -= 8*mpa->sideinfo.main_data_begin;
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static int III_get_scale_factors(mpadec_t mpadec, grinfo_t *gr_info, int32_t *scf)
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register struct mpadec_t *mpa = (struct mpadec_t *)mpadec;
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register grinfo_t *grinfo = gr_info;
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static uint8_t slen[2][16] =
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{ {0, 0, 0, 0, 3, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4},
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{0, 1, 2, 3, 0, 1, 2, 3, 1, 2, 3, 1, 2, 3, 2, 3} };
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static uint8_t stab[3][6][4] =
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{ { { 6, 5, 5,5 } , { 6, 5, 7,3 } , { 11,10,0,0} ,
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{ 7, 7, 7,0 } , { 6, 6, 6,3 } , { 8, 8,5,0} } ,
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{ { 9, 9, 9,9 } , { 9, 9,12,6 } , { 18,18,0,0} ,
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{12,12,12,0 } , {12, 9, 9,6 } , { 15,12,9,0} } ,
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{ { 6, 9, 9,9 } , { 6, 9,12,6 } , { 15,18,0,0} ,
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{ 6,15,12,0 } , { 6,12, 9,6 } , { 6,18,9,0} } };
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if (!mpa->frame.LSF) {
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int i, num0 = slen[0][grinfo->scalefac_compress],
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num1 = slen[1][grinfo->scalefac_compress];
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if (grinfo->block_type == 2) {
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i = 18; numbits = 18*(num0 + num1);
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if (grinfo->mixed_block_flag) {
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for (; i; i--) *scf++ = GETBITS(num0);
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for (i = 18; i; i--) *scf++ = GETBITS(num1);
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scf[0] = scf[1] = scf[2] = 0;
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if (grinfo->scfsi < 0) {
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for (i = 11; i; i--) *scf++ = GETBITS(num0);
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for (i = 10; i; i--) *scf++ = GETBITS(num1);
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numbits = 10*(num0 + num1) + num0;
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if (!(grinfo->scfsi & 8)) {
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for (i = 6; i; i--) *scf++ = GETBITS(num0);
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if (!(grinfo->scfsi & 4)) {
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for (i = 5; i; i--) *scf++ = GETBITS(num0);
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if (!(grinfo->scfsi & 2)) {
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for (i = 5; i; i--) *scf++ = GETBITS(num1);
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if (!(grinfo->scfsi & 1)) {
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for (i = 5; i; i--) *scf++ = GETBITS(num1);
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unsigned s_len; uint8_t *pnt;
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if ((mpa->frame.mode == MPG_MD_JOINT_STEREO) && (mpa->frame.mode_ext & 1)) {
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s_len = mpa->tables.i_slen2[grinfo->scalefac_compress >> 1];
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} else s_len = mpa->tables.n_slen2[grinfo->scalefac_compress];
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grinfo->preflag = (uint8_t)((s_len >> 15) & 1);
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if (grinfo->block_type == 2) n = grinfo->mixed_block_flag ? 2 : 1;
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pnt = stab[n][(s_len >> 12) & 7];
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for (i = 0; i < 4; i++) {
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for (j = 0; j < (int)pnt[i]; j++) *scf++ = GETBITS(num);
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numbits += pnt[i]*num;
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} else for (j = 0; j < (int)pnt[i]; j++) *scf++ = 0;
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for (i = (n << 1) + 1; i; i--) *scf++ = 0;
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static int III_decode_samples(mpadec_t mpadec, grinfo_t *gr_info, MYFLT xr[SBLIMIT][SSLIMIT], int32_t *scf, int part2bits)
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register struct mpadec_t *mpa = (struct mpadec_t *)mpadec;
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register grinfo_t *grinfo = gr_info;
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int shift = 1 + grinfo->scalefac_scale, l[3], l3;
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int part2remain = grinfo->part2_3_length - part2bits;
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MYFLT *xrptr = (MYFLT *)xr; int32_t *me;
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static uint8_t pretab1[22] =
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 3, 2, 0 };
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static uint8_t pretab2[22] =
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{ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
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l3 = ((576 >> 1) - grinfo->big_values) >> 1;
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if (grinfo->big_values <= grinfo->region1start) {
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l[0] = grinfo->big_values;
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l[0] = grinfo->region1start;
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if (grinfo->big_values <= grinfo->region2start) {
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l[1] = grinfo->big_values - l[0]; l[2] = 0;
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l[1] = grinfo->region2start - l[0];
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l[2] = grinfo->big_values - grinfo->region2start;
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if (grinfo->block_type == 2) {
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int32_t i, max[4], step = 0, lwin = 0, cb = 0;
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register MYFLT v = 0.0;
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register int32_t *m, mc;
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if (grinfo->mixed_block_flag) {
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max[0] = max[1] = max[2] = 2;
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m = mpa->tables.map[mpa->frame.frequency_index][0];
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me = mpa->tables.mapend[mpa->frame.frequency_index][0];
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max[0] = max[1] = max[2] = max[3] = -1;
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m = mpa->tables.map[mpa->frame.frequency_index][1];
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me = mpa->tables.mapend[mpa->frame.frequency_index][1];
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for (i = 0; i < 2; i++) {
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newhuff_t *h = hufft + grinfo->table_select[i];
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for (; lp; lp--, mc--) {
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xrptr = ((MYFLT *)xr) + (*m++);
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v = grinfo->pow2gain[(*scf++) << shift];
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v = grinfo->full_gain[lwin][(*scf++) << shift];
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register int16_t *val = h->table;
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while ((y = *val++) < 0) {
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if (GETBITS(1)) val -= y;
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if ((x == 15) && h->linbits) {
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part2remain -= h->linbits + 1;
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x += GETBITS(h->linbits);
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if (GETBITS(1)) *xrptr = -mpa->tables.ispow[x]*v;
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else *xrptr = mpa->tables.ispow[x]*v;
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if (GETBITS(1)) *xrptr = -mpa->tables.ispow[x]*v;
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else *xrptr = mpa->tables.ispow[x]*v;
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if ((y == 15) && h->linbits) {
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part2remain -= h->linbits + 1;
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y += GETBITS(h->linbits);
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if (GETBITS(1)) *xrptr = -mpa->tables.ispow[y]*v;
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else *xrptr = mpa->tables.ispow[y]*v;
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if (GETBITS(1)) *xrptr = -mpa->tables.ispow[y]*v;
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else *xrptr = mpa->tables.ispow[y]*v;
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for (; l3 && (part2remain > 0); l3--) {
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newhuff_t *h = hufftc + grinfo->count1table_select;
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register int16_t *val = h->table, a;
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while ((a = *val++) < 0) {
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if (part2remain < 0) {
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if (GETBITS(1)) val -= a;
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for (i = 0; i < 4; i++) {
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xrptr = ((MYFLT *)xr) + (*m++);
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v = grinfo->pow2gain[(*scf++) << shift];
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v = grinfo->full_gain[lwin][(*scf++) << shift];
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if (part2remain < 0) {
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if (GETBITS(1)) *xrptr = -v;
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for (; mc > 0; mc--) {
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xrptr[0] = xrptr[3] = 0.0;
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xrptr = ((MYFLT *)xr) + (*m++);
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if ((*m++) == 0) break;
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grinfo->maxband[0] = max[0] + 1;
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grinfo->maxband[1] = max[1] + 1;
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grinfo->maxband[2] = max[2] + 1;
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grinfo->maxbandl = max[3] + 1;
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int rmax = max[0] > max[1] ? max[0] : max[1];
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rmax = (rmax > max[2] ? rmax : max[2]) + 1;
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rmax ? mpa->tables.short_limit[mpa->frame.frequency_index][rmax] :
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mpa->tables.long_limit[mpa->frame.frequency_index][max[3] + 1];
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uint8_t *pretab = grinfo->preflag ? pretab1 : pretab2;
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int32_t i, max = -1, cb = 0, mc = 0;
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int32_t *m = mpa->tables.map[mpa->frame.frequency_index][2];
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register MYFLT v = 0.0;
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for (i = 0; i < 3; i++) {
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newhuff_t *h = hufft + grinfo->table_select[i];
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for (; lp; lp--, mc--) {
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if (cb == 21) v = 0.0;
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else v = grinfo->pow2gain[((*scf++) + (*pretab++)) << shift];
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register int16_t *val = h->table;
377
while ((y = *val++) < 0) {
378
if (GETBITS(1)) val -= y;
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if ((x == 15) && h->linbits) {
386
part2remain -= h->linbits + 1;
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x += GETBITS(h->linbits);
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if (GETBITS(1)) *xrptr++ = -mpa->tables.ispow[x]*v;
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else *xrptr++ = mpa->tables.ispow[x]*v;
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if (GETBITS(1)) *xrptr++ = -mpa->tables.ispow[x]*v;
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else *xrptr++ = mpa->tables.ispow[x]*v;
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} else *xrptr++ = 0.0;
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if ((y == 15) && h->linbits) {
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part2remain -= h->linbits + 1;
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y += GETBITS(h->linbits);
400
if (GETBITS(1)) *xrptr++ = -mpa->tables.ispow[y]*v;
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else *xrptr++ = mpa->tables.ispow[y]*v;
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if (GETBITS(1)) *xrptr++ = -mpa->tables.ispow[y]*v;
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else *xrptr++ = mpa->tables.ispow[y]*v;
407
} else *xrptr++ = 0.0;
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for (; l3 && (part2remain > 0); l3--) {
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newhuff_t *h = hufftc + grinfo->count1table_select;
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register int16_t *val = h->table, a;
413
while ((a = *val++) < 0) {
415
if (part2remain < 0) {
420
if (GETBITS(1)) val -= a;
422
for (i = 0; i < 4; i++) {
427
v = grinfo->pow2gain[((*scf++) + (*pretab++)) << shift];
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if (part2remain < 0) {
438
if (GETBITS(1)) *xrptr++ = -v;
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} else *xrptr++ = 0.0;
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grinfo->maxbandl = max + 1;
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grinfo->maxb = mpa->tables.long_limit[mpa->frame.frequency_index][max + 1];
446
while (xrptr < &xr[SBLIMIT][0]) *xrptr++ = 0.0;
447
while (part2remain > 0) {
448
register unsigned tmp, i = (part2remain > 16) ? 16 : part2remain;
453
mpa->error = (uint8_t)((part2remain < 0) ? TRUE : FALSE);
457
static void III_i_stereo(mpadec_t mpadec, grinfo_t *gr_info,
458
MYFLT xrbuf[2][SBLIMIT][SSLIMIT], int32_t *scalefac)
460
register struct mpadec_t *mpa = (struct mpadec_t *)mpadec;
461
register grinfo_t *grinfo = gr_info;
462
MYFLT (*xr)[SBLIMIT*SSLIMIT] = (MYFLT (*)[SBLIMIT*SSLIMIT])xrbuf;
463
bandinfo_t *bi = &band_info[mpa->frame.frequency_index];
464
int tab = mpa->frame.LSF + (grinfo->scalefac_compress & mpa->frame.LSF);
465
int ms_stereo = ((mpa->frame.mode == MPG_MD_JOINT_STEREO) &&
466
(mpa->frame.mode_ext & 2)) ? TRUE : FALSE;
467
const MYFLT *tab1, *tab2;
469
tab1 = mpa->tables.istabs[tab][ms_stereo][0];
470
tab2 = mpa->tables.istabs[tab][ms_stereo][1];
471
if (grinfo->block_type == 2) {
472
int lwin, do_l = grinfo->mixed_block_flag;
473
for (lwin = 0; lwin < 3; lwin++) {
474
int32_t is_p, sb, idx, sfb = grinfo->maxband[lwin];
475
if (sfb > 3) do_l = FALSE;
476
for (; sfb < 12; sfb++) {
477
is_p = scalefac[3*sfb + lwin - grinfo->mixed_block_flag];
479
MYFLT t1 = tab1[is_p], t2 = tab2[is_p];
480
sb = bi->short_diff[sfb];
481
idx = bi->short_idx[sfb] + lwin;
482
for (; sb; sb--, idx += 3) {
483
register MYFLT v = xr[0][idx];
489
is_p = scalefac[3*11 + lwin - grinfo->mixed_block_flag];
490
sb = bi->short_diff[12];
491
idx = bi->short_idx[12] + lwin;
493
MYFLT t1 = tab1[is_p], t2 = tab2[is_p];
494
for (; sb; sb--, idx += 3) {
495
register MYFLT v = xr[0][idx];
502
int sfb = grinfo->maxbandl;
503
int idx = bi->long_idx[sfb];
504
for (; sfb < 8; sfb++) {
505
int sb = bi->long_diff[sfb];
506
int is_p = scalefac[sfb];
508
MYFLT t1 = tab1[is_p], t2 = tab2[is_p];
509
for (; sb; sb--, idx++) {
510
register MYFLT v = xr[0][idx];
518
int sfb = grinfo->maxbandl;
519
int is_p, idx = bi->long_idx[sfb];
520
for (; sfb < 21; sfb++) {
521
int sb = bi->long_diff[sfb];
522
is_p = scalefac[sfb];
524
MYFLT t1 = tab1[is_p], t2 = tab2[is_p];
525
for (; sb; sb--, idx++) {
526
register MYFLT v = xr[0][idx];
534
int sb = bi->long_diff[21];
535
MYFLT t1 = tab1[is_p], t2 = tab2[is_p];
536
for (; sb; sb--, idx++) {
537
register MYFLT v = xr[0][idx];
545
static void III_antialias(grinfo_t *gr_info, MYFLT xr[SBLIMIT][SSLIMIT])
547
register grinfo_t *grinfo = gr_info;
550
if (grinfo->block_type == 2) {
551
if (!grinfo->mixed_block_flag) return;
553
} else sblim = grinfo->maxb - 1;
556
MYFLT *xr1 = (MYFLT *)xr[1];
557
for (sb = sblim; sb; sb--, xr1 += 10) {
560
for (ss = 0; ss < 8; ss++) {
561
register MYFLT bu = *--xr2, bd = *xr1;
562
*xr2 = bu*cs[ss] - bd*ca[ss];
563
*xr1++ = bd*cs[ss] + bu*ca[ss];
569
static void dct36(register MYFLT *in, register MYFLT *out1,
570
register MYFLT *out2, register MYFLT *w, register MYFLT *ts)
575
in[17] += in[16]; in[16] += in[15]; in[15] += in[14];
576
in[14] += in[13]; in[13] += in[12]; in[12] += in[11];
577
in[11] += in[10]; in[10] += in[9]; in[9] += in[8];
578
in[8] += in[7]; in[7] += in[6]; in[6] += in[5];
579
in[5] += in[4]; in[4] += in[3]; in[3] += in[2];
580
in[2] += in[1]; in[1] += in[0];
582
in[17] += in[15]; in[15] += in[13]; in[13] += in[11]; in[11] += in[9];
583
in[9] += in[7]; in[7] += in[5]; in[5] += in[3]; in[3] += in[1];
590
t0 = newcos[7]*(in[8] + in[16] - in[4]);
591
t1 = newcos[7]*in[12];
594
tmp[1] = tmp[7] = t2 - t0;
595
tmp[4] = t2 + t0 + t0;
597
t2 = newcos[6]*(in[10] + in[14] - in[2]);
604
t0 = newcos[0]*(in[4] + in[8]);
605
t1 = newcos[1]*(in[8] - in[16]);
606
t2 = newcos[2]*(in[4] + in[16]);
607
tmp[2] = tmp[6] = t3 - t0 - t2;
608
tmp[0] = tmp[8] = t3 + t0 + t1;
609
tmp[3] = tmp[5] = t3 - t1 + t2;
615
t1 = newcos[3]*(in[2] + in[10]);
616
t2 = newcos[4]*(in[10] - in[14]);
617
t3 = newcos[6]*in[6];
619
MYFLT t0 = t1 + t2 + t3;
625
t3 = newcos[5]*(in[2] + in[14]);
634
MYFLT t0, t1, t2, t3, t4, t5, t6, t7;
636
t1 = newcos[7]*in[13];
637
t2 = newcos[7]*(in[9] + in[17] - in[5]);
639
t4 = in[1] - t1 - t1;
641
t0 = newcos[0]*(in[5] + in[9]);
642
t1 = newcos[1]*(in[9] - in[17]);
643
tmp[13] = (t4 + t2 + t2)*tfcos36[17 - 13];
644
t2 = newcos[2]*(in[5] + in[17]);
648
t2 = newcos[3]*(in[3] + in[11]);
649
t4 = newcos[4]*(in[11] - in[15]);
650
t7 = newcos[6]*in[7];
652
tmp[17] = (t0 + t1)*tfcos36[17 - 17];
653
tmp[9] = (t0 - t1)*tfcos36[17 - 9];
654
t1 = newcos[5]*(in[3] + in[15]);
656
tmp[14] = (t3 + t2)*tfcos36[17 - 14];
657
t0 = newcos[6]*(in[11] + in[15] - in[3]);
658
tmp[12] = (t3 - t2)*tfcos36[17 - 12];
660
tmp[16] = (t5 - t0)*tfcos36[17 - 16];
661
tmp[10] = (t5 + t0)*tfcos36[17 - 10];
662
tmp[15] = (t6 + t4)*tfcos36[17 - 15];
663
tmp[11] = (t6 - t4)*tfcos36[17 - 11];
666
#define DCT36_MACRO(v) { \
667
register MYFLT tmpval = tmp[(v)] + tmp[17 - (v)]; \
668
out2[9 + (v)] = tmpval*w[27 + (v)]; \
669
out2[8 - (v)] = tmpval*w[26 - (v)]; \
670
tmpval = tmp[(v)] - tmp[17 - (v)]; \
671
ts[SBLIMIT*(8 - (v))] = out1[8 - (v)] + tmpval*w[8 - (v)]; \
672
ts[SBLIMIT*(9 + (v))] = out1[9 + (v)] + tmpval*w[9 + (v)]; \
689
static void dct12(register MYFLT *in, register MYFLT *out1,
690
register MYFLT *out2, register MYFLT *w, register MYFLT *ts)
692
#define DCT12_PART1 in5 = in[5*3]; \
693
in5 += (in4 = in[4*3]); \
694
in4 += (in3 = in[3*3]); \
695
in3 += (in2 = in[2*3]); \
696
in2 += (in1 = in[1*3]); \
697
in1 += (in0 = in[0*3]); \
698
in5 += in3; in3 += in1; \
702
#define DCT12_PART2 in0 += in4*newcos[7]; \
705
in1 += in5*newcos[7]; \
706
in5 = (in1 + in3)*tfcos12[0]; \
707
in1 = (in1 - in3)*tfcos12[2]; \
714
MYFLT in0, in1, in2, in3, in4, in5;
716
ts[0*SBLIMIT] = out1[0]; ts[1*SBLIMIT] = out1[1]; ts[2*SBLIMIT] = out1[2];
717
ts[3*SBLIMIT] = out1[3]; ts[4*SBLIMIT] = out1[4]; ts[5*SBLIMIT] = out1[5];
722
register MYFLT tmp0, tmp1 = in0 - in4;
724
register MYFLT tmp2 = (in1 - in5)*tfcos12[1];
728
ts[(17 - 1)*SBLIMIT] = out1[17 - 1] + tmp0*w[11 - 1];
729
ts[(12 + 1)*SBLIMIT] = out1[12 + 1] + tmp0*w[6 + 1];
730
ts[(6 + 1)*SBLIMIT] = out1[6 + 1] + tmp1*w[1];
731
ts[(11 - 1)*SBLIMIT] = out1[11 - 1] + tmp1*w[5 - 1];
736
ts[(17 - 0)*SBLIMIT] = out1[17 - 0] + in2*w[11 - 0];
737
ts[(12 + 0)*SBLIMIT] = out1[12 + 0] + in2*w[6 + 0];
738
ts[(12 + 2)*SBLIMIT] = out1[12 + 2] + in3*w[6 + 2];
739
ts[(17 - 2)*SBLIMIT] = out1[17 - 2] + in3*w[11 - 2];
740
ts[(6 + 0)*SBLIMIT] = out1[6 + 0] + in0*w[0];
741
ts[(11 - 0)*SBLIMIT] = out1[11 - 0] + in0*w[5 - 0];
742
ts[(6 + 2)*SBLIMIT] = out1[6 + 2] + in4*w[2];
743
ts[(11 - 2)*SBLIMIT] = out1[11 - 2] + in4*w[5 - 2];
747
MYFLT in0, in1, in2, in3, in4, in5;
752
register MYFLT tmp0, tmp1 = in0 - in4;
754
register MYFLT tmp2 = (in1 - in5)*tfcos12[1];
758
out2[5 - 1] = tmp0*w[11 - 1];
759
out2[0 + 1] = tmp0*w[6 + 1];
760
ts[(12 + 1)*SBLIMIT] += tmp1*w[0 + 1];
761
ts[(17 - 1)*SBLIMIT] += tmp1*w[5 - 1];
766
out2[5 - 0] = in2*w[11 - 0];
767
out2[0 + 0] = in2*w[6 + 0];
768
out2[0 + 2] = in3*w[6 + 2];
769
out2[5 - 2] = in3*w[11 - 2];
770
ts[(12 + 0)*SBLIMIT] += in0*w[0];
771
ts[(17 - 0)*SBLIMIT] += in0*w[5 - 0];
772
ts[(12 + 2)*SBLIMIT] += in4*w[2];
773
ts[(17 - 2)*SBLIMIT] += in4*w[5 - 2];
777
MYFLT in0, in1, in2, in3, in4, in5;
779
out2[12] = out2[13] = out2[14] = out2[15] = out2[16] = out2[17] = 0.0;
784
register MYFLT tmp0, tmp1 = in0 - in4;
786
register MYFLT tmp2 = (in1 - in5)*tfcos12[1];
790
out2[11 - 1] = tmp0*w[11 - 1];
791
out2[6 + 1] = tmp0*w[6 + 1];
792
out2[0 + 1] += tmp1*w[1];
793
out2[5 - 1] += tmp1*w[5 - 1];
798
out2[11 - 0] = in2*w[11 - 0];
799
out2[6 + 0] = in2*w[6 + 0];
800
out2[6 + 2] = in3*w[6 + 2];
801
out2[11 - 2] = in3*w[11 - 2];
802
out2[0 + 0] += in0*w[0];
803
out2[5 - 0] += in0*w[5 - 0];
804
out2[0 + 2] += in4*w[2];
805
out2[5 - 2] += in4*w[5 - 2];
811
static void III_hybrid(mpadec_t mpadec, grinfo_t *gr_info,
812
MYFLT fs_in[SBLIMIT][SSLIMIT],
813
MYFLT ts_out[SSLIMIT][SBLIMIT], int channel)
815
register struct mpadec_t *mpa = (struct mpadec_t *)mpadec;
816
register grinfo_t *grinfo = gr_info;
817
MYFLT *tsptr = (MYFLT *)ts_out;
819
unsigned bt = grinfo->block_type, sb = 0;
822
register unsigned b = mpa->hybrid_block[channel];
823
out1 = mpa->hybrid_buffers[b][channel];
825
out2 = mpa->hybrid_buffers[b][channel];
826
mpa->hybrid_block[channel] = (uint8_t)b;
828
if (grinfo->mixed_block_flag) {
830
dct36(fs_in[0], out1, out2, mpa->tables.win[0][0], tsptr);
831
dct36(fs_in[1], out1 + SSLIMIT, out2 + SSLIMIT,
832
mpa->tables.win[1][0], tsptr + 1);
833
out1 += 36; out2 += 36; tsptr += 2;
836
for (; sb < grinfo->maxb; sb += 2, out1 += 36, out2 += 36, tsptr += 2) {
837
dct12(fs_in[sb], out1, out2, mpa->tables.win[0][2], tsptr);
838
dct12(fs_in[sb + 1], out1 + SSLIMIT, out2 + SSLIMIT,
839
mpa->tables.win[1][2], tsptr + 1);
842
for (; sb < grinfo->maxb; sb += 2, out1 += 36, out2 += 36, tsptr += 2) {
843
dct36(fs_in[sb], out1, out2, mpa->tables.win[0][bt], tsptr);
844
dct36(fs_in[sb + 1], out1 + SSLIMIT, out2 + SSLIMIT,
845
mpa->tables.win[1][bt], tsptr + 1);
848
for (; sb < SBLIMIT; sb++, tsptr++) {
850
for (i = 0; i < SSLIMIT; i++) {
851
tsptr[i*SBLIMIT] = *out1++;
857
void decode_layer3(mpadec_t mpadec, uint8_t *buffer)
859
register struct mpadec_t *mpa = (struct mpadec_t *)mpadec;
860
uint8_t *saved_next_byte = mpa->next_byte;
861
uint32_t saved_bytes_left = mpa->bytes_left;
862
int32_t dbits, scalefacs[2][39];
863
int ch, gr, ss, i_stereo, ms_stereo, single, channels,
864
granules = mpa->frame.LSF ? 1 : 2;
868
if (mpa->config.crc && mpa->frame.CRC) {
869
mpa->crc = update_crc(mpa->crc, mpa->next_byte, mpa->ssize << 3);
870
if (mpa->crc != mpa->frame.crc) mpa->error = TRUE;
872
dbits = decode_layer3_sideinfo(mpa);
873
mpa->dsize = (((dbits < 0) ? 0 : dbits) + 7) >> 3;
874
mpa->next_byte = saved_next_byte + mpa->ssize;
875
mpa->bytes_left = saved_bytes_left - mpa->ssize;
877
saved_next_byte = NULL;
878
saved_bytes_left = mpa->bytes_left;
879
if (mpa->error) mpa->sideinfo.main_data_begin = mpa->reservoir_size + 1;
880
if (mpa->sideinfo.main_data_begin) {
881
if (mpa->sideinfo.main_data_begin <= mpa->reservoir_size) {
882
uint8_t *ptr = mpa->reservoir + mpa->reservoir_size;
883
uint32_t tmp = mpa->frame.frame_size - mpa->hsize - mpa->ssize;
884
if (tmp > (sizeof(mpa->reservoir) - mpa->reservoir_size))
885
tmp = sizeof(mpa->reservoir) - mpa->reservoir_size;
886
saved_next_byte = mpa->next_byte;
887
memcpy(ptr, mpa->next_byte, tmp);
888
mpa->next_byte = ptr - mpa->sideinfo.main_data_begin;
889
mpa->bytes_left = mpa->sideinfo.main_data_begin + tmp;
891
uint32_t tmp = mpa->frame.frame_size - mpa->hsize - mpa->ssize;
893
mpa->next_byte += tmp - 512;
894
mpa->bytes_left -= tmp - 512;
897
if ((mpa->reservoir_size) && (mpa->reservoir_size > 512)) {
898
memmove(mpa->reservoir, mpa->reservoir + mpa->reservoir_size - 512, 512);
899
mpa->reservoir_size = 512;
901
memcpy(mpa->reservoir + mpa->reservoir_size, mpa->next_byte, tmp);
902
mpa->reservoir_size += tmp;
903
mpa->next_byte += tmp;
904
mpa->bytes_left -= tmp;
905
memset(buffer, 0, mpa->frame.decoded_size);
910
if (mpa->frame.mode == MPG_MD_JOINT_STEREO) {
911
i_stereo = mpa->frame.mode_ext & 1;
912
ms_stereo = (mpa->frame.mode_ext & 2) >> 1;
913
} else i_stereo = ms_stereo = 0;
914
if (mpa->frame.channels > 1) switch (mpa->config.mode) {
915
case MPADEC_CONFIG_MONO: single = 0; break;
916
case MPADEC_CONFIG_CHANNEL1: single = 1; break;
917
case MPADEC_CONFIG_CHANNEL2: single = 2; break;
918
default: single = -1; break;
920
channels = (single < 0) ? 2 : 1;
921
for (gr = 0; gr < granules; gr++) {
922
grinfo_t *grinfo = &mpa->sideinfo.ch[0].gr[gr];
923
int32_t part2bits = III_get_scale_factors(mpa, grinfo, scalefacs[0]);
924
if (III_decode_samples(mpa, grinfo, mpa->hybrid_in[0], scalefacs[0],
926
unsigned size = mpa->frame.decoded_size;
927
if (!mpa->frame.LSF && gr) size >>= 1;
928
memset(buffer, 0, size);
932
if (mpa->frame.channels > 1) {
933
grinfo = &mpa->sideinfo.ch[1].gr[gr];
934
part2bits = III_get_scale_factors(mpa, grinfo, scalefacs[1]);
935
if (III_decode_samples(mpa, grinfo, mpa->hybrid_in[1], scalefacs[1],
937
unsigned size = mpa->frame.decoded_size;
938
if (!mpa->frame.LSF && gr) size >>= 1;
939
memset(buffer, 0, size);
944
MYFLT *in0 = (MYFLT *)(mpa->hybrid_in[0]),
945
*in1 = (MYFLT *)(mpa->hybrid_in[1]);
946
unsigned i, maxb = mpa->sideinfo.ch[0].gr[gr].maxb;
947
if (mpa->sideinfo.ch[1].gr[gr].maxb > maxb)
948
maxb = mpa->sideinfo.ch[1].gr[gr].maxb;
949
for (i = 0; i < SSLIMIT*maxb; i++) {
950
register MYFLT tmp0 = in0[i];
951
register MYFLT tmp1 = in1[i];
952
in0[i] = tmp0 + tmp1;
953
in1[i] = tmp0 - tmp1;
956
if (i_stereo) III_i_stereo(mpa, grinfo, mpa->hybrid_in, scalefacs[1]);
957
if (i_stereo || ms_stereo || !single) {
958
if (grinfo->maxb > mpa->sideinfo.ch[0].gr[gr].maxb)
959
mpa->sideinfo.ch[0].gr[gr].maxb = grinfo->maxb;
960
else grinfo->maxb = mpa->sideinfo.ch[0].gr[gr].maxb;
964
MYFLT *in0 = (MYFLT *)(mpa->hybrid_in[0]),
965
*in1 = (MYFLT *)(mpa->hybrid_in[1]);
966
for (i = 0; i < SSLIMIT*grinfo->maxb; i++, in0++)
967
*in0 = (*in0 + *in1++);
968
} else if (single == 2) {
970
MYFLT *in0 = (MYFLT *)(mpa->hybrid_in[0]),
971
*in1 = (MYFLT *)(mpa->hybrid_in[1]);
972
for (i = 0; i < SSLIMIT*grinfo->maxb; i++, in0++) *in0 = *in1++;
975
for (ch = 0; ch < channels; ch++) {
976
grinfo = &mpa->sideinfo.ch[ch].gr[gr];
977
III_antialias(grinfo, mpa->hybrid_in[ch]);
978
III_hybrid(mpa, grinfo, mpa->hybrid_in[ch], mpa->hybrid_out[ch], ch);
981
for (ss = 0; ss < SSLIMIT; ss++, buffer += mpa->synth_size) {
982
mpa->synth_func(mpa, mpa->hybrid_out[0][ss], 0, buffer);
983
mpa->synth_func(mpa, mpa->hybrid_out[1][ss], 1, buffer);
986
for (ss = 0; ss < SSLIMIT; ss++, buffer += mpa->synth_size) {
987
mpa->synth_func(mpa, mpa->hybrid_out[0][ss], 0, buffer);
993
register unsigned n = mpa->bits_left >> 3;
995
mpa->bytes_left += n;
996
if (saved_next_byte) {
997
uint32_t tmp = mpa->frame.frame_size - mpa->hsize - mpa->ssize;
998
if (mpa->bytes_left) {
999
if (mpa->bytes_left > 512) {
1000
mpa->next_byte += mpa->bytes_left - 512;
1001
mpa->bytes_left = 512;
1003
memmove(mpa->reservoir, mpa->next_byte, mpa->bytes_left);
1004
mpa->reservoir_size = mpa->bytes_left;
1005
} else mpa->reservoir_size = 0;
1006
mpa->next_byte = saved_next_byte + tmp;
1007
mpa->bytes_left = saved_bytes_left - tmp;
1009
uint32_t tmp = mpa->frame.frame_size - mpa->hsize - mpa->ssize;
1010
mpa->reservoir_size = 0;
1011
if (tmp > (saved_bytes_left - mpa->bytes_left)) {
1012
tmp -= saved_bytes_left - mpa->bytes_left;
1014
mpa->next_byte += tmp - 512;
1015
mpa->bytes_left -= tmp - 512;
1018
memcpy(mpa->reservoir, mpa->next_byte, tmp);
1019
mpa->reservoir_size = tmp;
1020
mpa->next_byte += tmp;
1021
mpa->bytes_left -= tmp;