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989 lines
34 KiB
989 lines
34 KiB
/*****************************************************************************
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* layer2.c: MPEG Layer II audio decoder
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*****************************************************************************
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* Copyright (C) 1999-2001 VideoLAN
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* $Id: layer2.c,v 1.4 2002/08/26 23:00:22 massiot Exp $
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*
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* Authors: Michel Kaempf <maxx@via.ecp.fr>
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* Michel Lespinasse <walken@via.ecp.fr>
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*
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* This program 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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* This program 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, USA.
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*****************************************************************************/
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#include <stdlib.h> /* NULL */
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#include <string.h> /* memcpy(), memset() */
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#include <vlc/vlc.h>
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#include <vlc/decoder.h>
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#include <vlc/aout.h>
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#include "generic.h"
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#include "decoder.h"
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#include "math.h" /* DCT32(), PCM() */
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/**** wkn ****/
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static float adec_scalefactor_table[64] =
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{ /* 2 ^ (1 - i/3) */
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2.0000000000000000, 1.5874010519681994, 1.2599210498948732,
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1.0000000000000000, 0.7937005259840998, 0.6299605249474366,
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0.5000000000000000, 0.3968502629920499, 0.3149802624737183,
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0.2500000000000000, 0.1984251314960249, 0.1574901312368591,
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0.1250000000000000, 0.0992125657480125, 0.0787450656184296,
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0.0625000000000000, 0.0496062828740062, 0.0393725328092148,
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0.0312500000000000, 0.0248031414370031, 0.0196862664046074,
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0.0156250000000000, 0.0124015707185016, 0.0098431332023037,
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0.0078125000000000, 0.0062007853592508, 0.0049215666011518,
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0.0039062500000000, 0.0031003926796254, 0.0024607833005759,
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0.0019531250000000, 0.0015501963398127, 0.0012303916502880,
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0.0009765625000000, 0.0007750981699063, 0.0006151958251440,
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0.0004882812500000, 0.0003875490849532, 0.0003075979125720,
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0.0002441406250000, 0.0001937745424766, 0.0001537989562860,
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0.0001220703125000, 0.0000968872712383, 0.0000768994781430,
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0.0000610351562500, 0.0000484436356191, 0.0000384497390715,
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0.0000305175781250, 0.0000242218178096, 0.0000192248695357,
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0.0000152587890625, 0.0000121109089048, 0.0000096124347679,
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0.0000076293945312, 0.0000060554544524, 0.0000048062173839,
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0.0000038146972656, 0.0000030277272262, 0.0000024031086920,
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0.0000019073486328, 0.0000015138636131, 0.0000012015543460,
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0.0000009536743164 /* last element is not in the standard... invalid ??? */
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};
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static float adec_slope_table[15] =
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{
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0.6666666666666666, 0.2857142857142857, 0.1333333333333333,
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0.0645161290322581, 0.0317460317460317, 0.0157480314960630,
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0.0078431372549020, 0.0039138943248532, 0.0019550342130987,
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0.0009770395701026, 0.0004884004884005, 0.0002441704309608,
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0.0001220777635354, 0.0000610370189520, 0.0000305180437934
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};
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static float adec_offset_table[15] =
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{
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-0.6666666666666666, -0.8571428571428571, -0.9333333333333333,
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-0.9677419354838710, -0.9841269841269841, -0.9921259842519685,
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-0.9960784313725490, -0.9980430528375733, -0.9990224828934506,
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-0.9995114802149487, -0.9997557997557998, -0.9998779147845196,
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-0.9999389611182323, -0.9999694814905240, -0.9999847409781033
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};
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static int adec_bound_table[4] = { 4, 8, 12, 16 };
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typedef struct
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{
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s8 nbal[32];
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s8 * alloc[32];
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} alloc_table_t;
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#define L3 -1
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#define L5 -2
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#define L9 -3
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static void adec_layer2_get_table( u32 header, u8 freq_table[15],
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alloc_table_t ** alloc, int * sblimit )
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{
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static s8 table_ab0[16] =
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{
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0, L3, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16
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};
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static s8 table_ab3[16] =
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{
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0, L3, L5, 3, L9, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16
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};
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static s8 table_ab11[8] =
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{
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0, L3, L5, 3, L9, 4, 5, 16
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};
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static s8 table_ab23[8] =
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{
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0, L3, L5, 16
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};
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static alloc_table_t mpeg1_ab =
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{
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{4,4,4,4,4,4,4,4,4,4,4,3,3,3,3,3,3,3,3,3,3,3,3,2,2,2,2,2,2,2,0,0},
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{table_ab0, table_ab0, table_ab0, table_ab3,
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table_ab3, table_ab3, table_ab3, table_ab3,
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table_ab3, table_ab3, table_ab3, table_ab11,
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table_ab11, table_ab11, table_ab11, table_ab11,
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table_ab11, table_ab11, table_ab11, table_ab11,
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table_ab11, table_ab11, table_ab11, table_ab23,
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table_ab23, table_ab23, table_ab23, table_ab23,
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table_ab23, table_ab23, NULL, NULL}
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};
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static s8 table_cd[16] =
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{
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0, L3, L5, L9, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
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};
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static alloc_table_t mpeg1_cd =
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{
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{4,4,3,3,3,3,3,3,3,3,3,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
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{table_cd, table_cd, table_cd, table_cd,
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table_cd, table_cd, table_cd, table_cd,
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table_cd, table_cd, table_cd, table_cd,
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NULL, NULL, NULL, NULL,
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NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
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NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL}
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};
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static s8 table_0[16] =
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{
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0, L3, L5, 3, L9, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
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};
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static s8 table_4[8] =
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{
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0, L3, L5, L9, 4, 5, 6, 7
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};
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static alloc_table_t mpeg2 =
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{
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{4,4,4,4,3,3,3,3,3,3,3,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,0,0},
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{table_0, table_0, table_0, table_0,
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table_4, table_4, table_4, table_4,
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table_4, table_4, table_4, table_4,
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table_4, table_4, table_4, table_4,
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table_4, table_4, table_4, table_4,
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table_4, table_4, table_4, table_4,
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table_4, table_4, table_4, table_4,
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table_4, table_4, NULL, NULL}
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};
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static alloc_table_t * alloc_table [4] =
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{
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&mpeg2, &mpeg1_cd, &mpeg1_ab, &mpeg1_ab
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};
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static int sblimit_table[12] =
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{
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30, 8, 27, 30, 30, 8, 27, 27, 30, 12, 27, 30
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};
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int index;
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if (!(header & 0x80000))
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{
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index = 0; /* mpeg2 */
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}
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else
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{
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index = (header >> 12) & 15; /* mpeg1, bitrate */
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index = freq_table [index];
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}
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*alloc = alloc_table[index];
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index |= (header >> 8) & 12;
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*sblimit = sblimit_table[index];
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}
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int adec_layer2_mono( adec_thread_t * p_adec, float * buffer )
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{
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static u8 freq_table[15] = {2, 1, 1, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2};
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static float L3_table[3] = {-2/3.0, 0, 2/3.0};
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static float L5_table[5] = {-4/5.0, -2/5.0, 0, 2/5.0, 4/5.0};
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static float L9_table[9] = {-8/9.0, -6/9.0, -4/9.0, -2/9.0, 0,
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2/9.0, 4/9.0, 6/9.0, 8/9.0};
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s8 allocation[32];
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u8 scfsi[32];
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float slope[3][32];
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float offset[3][32];
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float sample[3][32];
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alloc_table_t * alloc_table;
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int sblimit;
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int sb;
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int gr0, gr1;
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int s;
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int i_read_bits = 0;
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/* get the right allocation table */
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adec_layer2_get_table (p_adec->header, freq_table, &alloc_table, &sblimit);
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/* parse allocation */
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/*sblimit=27;*/
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for (sb = 0; sb < sblimit; sb++)
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{
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int index;
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index = GetBits( &p_adec->bit_stream, alloc_table->nbal[sb] );
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i_read_bits += alloc_table->nbal[sb];
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allocation[sb] = alloc_table->alloc[sb][index];
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}
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/* parse scfsi */
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for (sb = 0; sb < sblimit; sb++)
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{
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if (allocation[sb])
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{
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scfsi[sb] = GetBits (&p_adec->bit_stream, 2);
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i_read_bits += 2;
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}
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}
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/* parse scalefactors */
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for (sb = 0; sb < sblimit; sb++)
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{
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if (allocation[sb])
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{
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int index_0, index_1, index_2;
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switch (scfsi[sb])
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{
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case 0:
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index_0 = GetBits(&p_adec->bit_stream,6);
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index_1 = GetBits(&p_adec->bit_stream,6);
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index_2 = GetBits(&p_adec->bit_stream,6);
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i_read_bits += 18;
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if (allocation[sb] < 0)
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{
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slope[0][sb] = adec_scalefactor_table[index_0];
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slope[1][sb] = adec_scalefactor_table[index_1];
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slope[2][sb] = adec_scalefactor_table[index_2];
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}
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else
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{
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float r_scalefactor;
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float r_slope, r_offset;
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r_slope = adec_slope_table[allocation[sb]-2];
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r_offset = adec_offset_table[allocation[sb]-2];
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r_scalefactor = adec_scalefactor_table[index_0];
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slope[0][sb] = r_slope * r_scalefactor;
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offset[0][sb] = r_offset * r_scalefactor;
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r_scalefactor = adec_scalefactor_table[index_1];
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slope[1][sb] = r_slope * r_scalefactor;
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offset[1][sb] = r_offset * r_scalefactor;
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r_scalefactor = adec_scalefactor_table[index_2];
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slope[2][sb] = r_slope * r_scalefactor;
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offset[2][sb] = r_offset * r_scalefactor;
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}
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break;
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case 1:
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index_0 = GetBits(&p_adec->bit_stream,6);
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index_1 = GetBits(&p_adec->bit_stream,6);
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i_read_bits += 12;
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if (allocation[sb] < 0)
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{
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slope[0][sb] = slope[1][sb] =
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adec_scalefactor_table[index_0];
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slope[2][sb] = adec_scalefactor_table[index_1];
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}
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else
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{
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float r_scalefactor;
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float r_slope, r_offset;
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r_slope = adec_slope_table[allocation[sb]-2];
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r_offset = adec_offset_table[allocation[sb]-2];
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r_scalefactor = adec_scalefactor_table[index_0];
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slope[0][sb] = slope[1][sb] = r_slope * r_scalefactor;
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offset[0][sb] = offset[1][sb] =
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r_offset * r_scalefactor;
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r_scalefactor = adec_scalefactor_table[index_1];
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slope[2][sb] = r_slope * r_scalefactor;
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offset[2][sb] = r_offset * r_scalefactor;
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}
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break;
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case 2:
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index_0 = GetBits( &p_adec->bit_stream, 6 );
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i_read_bits += 6;
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if (allocation[sb] < 0)
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{
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slope[0][sb] = slope[1][sb] = slope[2][sb] =
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adec_scalefactor_table[index_0];
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}
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else
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{
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float r_scalefactor;
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float r_slope, r_offset;
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r_slope = adec_slope_table[allocation[sb]-2];
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r_offset = adec_offset_table[allocation[sb]-2];
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r_scalefactor = adec_scalefactor_table[index_0];
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slope[0][sb] = slope[1][sb] = slope[2][sb] =
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r_slope * r_scalefactor;
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offset[0][sb] = offset[1][sb] = offset[2][sb] =
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r_offset * r_scalefactor;
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}
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break;
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case 3:
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index_0 = GetBits(&p_adec->bit_stream,6);
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index_1 = GetBits(&p_adec->bit_stream,6);
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i_read_bits += 12;
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if (allocation[sb] < 0)
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{
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slope[0][sb] = adec_scalefactor_table[index_0];
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slope[1][sb] = slope[2][sb] =
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adec_scalefactor_table[index_1];
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}
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else
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{
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float r_scalefactor;
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float r_slope, r_offset;
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r_slope = adec_slope_table[allocation[sb]-2];
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r_offset = adec_offset_table[allocation[sb]-2];
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r_scalefactor = adec_scalefactor_table[index_0];
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slope[0][sb] = r_slope * r_scalefactor;
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offset[0][sb] = r_offset * r_scalefactor;
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r_scalefactor = adec_scalefactor_table[index_1];
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slope[1][sb] = slope[2][sb] = r_slope * r_scalefactor;
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offset[1][sb] = offset[2][sb] =
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r_offset * r_scalefactor;
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}
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break;
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}
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}
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}
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/* parse samples */
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for (gr0 = 0; gr0 < 3; gr0++)
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{
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for (gr1 = 0; gr1 < 4; gr1++)
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{
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for (sb = 0; sb < sblimit; sb++)
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{
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int code;
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switch (allocation[sb])
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{
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case 0:
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sample[0][sb] = sample[1][sb] = sample[2][sb] = 0;
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break;
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case L3:
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code = GetBits( &p_adec->bit_stream, 5 );
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i_read_bits += 5;
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sample[0][sb] = slope[gr0][sb] * L3_table[code % 3];
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code /= 3;
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sample[1][sb] = slope[gr0][sb] * L3_table[code % 3];
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code /= 3;
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sample[2][sb] = slope[gr0][sb] * L3_table[code];
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break;
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case L5:
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code = GetBits( &p_adec->bit_stream, 7 );
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i_read_bits += 7;
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sample[0][sb] = slope[gr0][sb] * L5_table[code % 5];
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code /= 5;
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sample[1][sb] = slope[gr0][sb] * L5_table[code % 5];
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code /= 5;
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sample[2][sb] = slope[gr0][sb] * L5_table[code];
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break;
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case L9:
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code = GetBits( &p_adec->bit_stream, 10 );
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i_read_bits += 10;
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sample[0][sb] = slope[gr0][sb] * L9_table[code % 9];
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code /= 9;
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sample[1][sb] = slope[gr0][sb] * L9_table[code % 9];
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code /= 9;
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sample[2][sb] = slope[gr0][sb] * L9_table[code];
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break;
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default:
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for (s = 0; s < 3; s++)
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{
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code = GetBits( &p_adec->bit_stream,
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allocation[sb] );
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i_read_bits += allocation[sb];
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sample[s][sb] =
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slope[gr0][sb] * code + offset[gr0][sb];
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}
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}
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}
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for (; sb < 32; sb++)
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{
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sample[0][sb] = sample[1][sb] = sample[2][sb] = 0;
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}
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for (s = 0; s < 3; s++)
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{
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DCT32( &p_adec->bank_0, sample[s] );
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PCM( &p_adec->bank_0, buffer, 1 );
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buffer += 32;
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}
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}
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}
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p_adec->i_read_bits += i_read_bits;
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return 0;
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}
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int adec_layer2_stereo( adec_thread_t * p_adec, float * buffer )
|
|
{
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static u8 freq_table[15] = {3, 0, 0, 0, 1, 0, 1, 2, 2, 2, 3, 3, 3, 3, 3};
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static float L3_table[3] = {-2/3.0, 0, 2/3.0};
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static float L5_table[5] = {-4/5.0, -2/5.0, 0, 2/5.0, 4/5.0};
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static float L9_table[9] = {-8/9.0, -6/9.0, -4/9.0, -2/9.0, 0,
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2/9.0, 4/9.0, 6/9.0, 8/9.0};
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|
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s8 allocation_0[32], allocation_1[32];
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u8 scfsi_0[32], scfsi_1[32];
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float slope_0[3][32], slope_1[3][32];
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float offset_0[3][32], offset_1[3][32];
|
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float sample_0[3][32], sample_1[3][32];
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alloc_table_t * alloc_table;
|
|
|
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int sblimit;
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int bound;
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int sb;
|
|
int gr0, gr1;
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|
int s;
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int i_read_bits = 0;
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|
|
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/* get the right allocation table */
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adec_layer2_get_table (p_adec->header, freq_table, &alloc_table, &sblimit);
|
|
|
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/* calculate bound */
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bound = sblimit;
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if ((p_adec->header & 0xc0) == 0x40) { /* intensity stereo */
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int index;
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index = (p_adec->header >> 4) & 3;
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if (adec_bound_table[index] < sblimit)
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{
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bound = adec_bound_table[index];
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}
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}
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|
|
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/* parse allocation */
|
|
|
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for (sb = 0; sb < bound; sb++)
|
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{
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int index;
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|
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index = GetBits( &p_adec->bit_stream, alloc_table->nbal[sb] );
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allocation_0[sb] = alloc_table->alloc[sb][index];
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index = GetBits( &p_adec->bit_stream, alloc_table->nbal[sb] );
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allocation_1[sb] = alloc_table->alloc[sb][index];
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|
|
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i_read_bits += alloc_table->nbal[sb] * 2;
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}
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|
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for (; sb < sblimit; sb++)
|
|
{
|
|
int index;
|
|
|
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index = GetBits( &p_adec->bit_stream, alloc_table->nbal[sb] );
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allocation_0[sb] = allocation_1[sb] = alloc_table->alloc[sb][index];
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i_read_bits += alloc_table->nbal[sb];
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}
|
|
|
|
/* parse scfsi */
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|
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for (sb = 0; sb < sblimit; sb++)
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|
{
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if (allocation_0[sb])
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|
{
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scfsi_0[sb] = GetBits (&p_adec->bit_stream, 2);
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i_read_bits += 2;
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}
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|
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if (allocation_1[sb])
|
|
{
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|
scfsi_1[sb] = GetBits (&p_adec->bit_stream, 2);
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i_read_bits += 2;
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}
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}
|
|
|
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/* parse scalefactors */
|
|
|
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for (sb = 0; sb < sblimit; sb++)
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|
{
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if (allocation_0[sb])
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|
{
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|
int index_0, index_1, index_2;
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|
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|
switch (scfsi_0[sb])
|
|
{
|
|
case 0:
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|
index_0 = GetBits(&p_adec->bit_stream,6);
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index_1 = GetBits(&p_adec->bit_stream,6);
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index_2 = GetBits(&p_adec->bit_stream,6);
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i_read_bits += 18;
|
|
|
|
if (allocation_0[sb] < 0)
|
|
{
|
|
slope_0[0][sb] = adec_scalefactor_table[index_0];
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slope_0[1][sb] = adec_scalefactor_table[index_1];
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slope_0[2][sb] = adec_scalefactor_table[index_2];
|
|
}
|
|
else
|
|
{
|
|
float scalefactor;
|
|
float slope, offset;
|
|
|
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slope = adec_slope_table[allocation_0[sb]-2];
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offset = adec_offset_table[allocation_0[sb]-2];
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|
|
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scalefactor = adec_scalefactor_table[index_0];
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slope_0[0][sb] = slope * scalefactor;
|
|
offset_0[0][sb] = offset * scalefactor;
|
|
|
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scalefactor = adec_scalefactor_table[index_1];
|
|
slope_0[1][sb] = slope * scalefactor;
|
|
offset_0[1][sb] = offset * scalefactor;
|
|
|
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scalefactor = adec_scalefactor_table[index_2];
|
|
slope_0[2][sb] = slope * scalefactor;
|
|
offset_0[2][sb] = offset * scalefactor;
|
|
}
|
|
break;
|
|
|
|
case 1:
|
|
index_0 = GetBits(&p_adec->bit_stream,6);
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|
index_1 = GetBits(&p_adec->bit_stream,6);
|
|
i_read_bits += 12;
|
|
|
|
if (allocation_0[sb] < 0)
|
|
{
|
|
slope_0[0][sb] = slope_0[1][sb] =
|
|
adec_scalefactor_table[index_0];
|
|
slope_0[2][sb] = adec_scalefactor_table[index_1];
|
|
}
|
|
else
|
|
{
|
|
float scalefactor;
|
|
float slope, offset;
|
|
|
|
slope = adec_slope_table[allocation_0[sb]-2];
|
|
offset = adec_offset_table[allocation_0[sb]-2];
|
|
|
|
scalefactor = adec_scalefactor_table[index_0];
|
|
slope_0[0][sb] = slope_0[1][sb] = slope * scalefactor;
|
|
offset_0[0][sb] = offset_0[1][sb] =
|
|
offset * scalefactor;
|
|
|
|
scalefactor = adec_scalefactor_table[index_1];
|
|
slope_0[2][sb] = slope * scalefactor;
|
|
offset_0[2][sb] = offset * scalefactor;
|
|
}
|
|
break;
|
|
|
|
case 2:
|
|
index_0 = GetBits( &p_adec->bit_stream, 6 );
|
|
i_read_bits += 6;
|
|
|
|
if (allocation_0[sb] < 0)
|
|
{
|
|
slope_0[0][sb] = slope_0[1][sb] = slope_0[2][sb] =
|
|
adec_scalefactor_table[index_0];
|
|
}
|
|
else
|
|
{
|
|
float scalefactor;
|
|
float slope, offset;
|
|
|
|
slope = adec_slope_table[allocation_0[sb]-2];
|
|
offset = adec_offset_table[allocation_0[sb]-2];
|
|
|
|
scalefactor = adec_scalefactor_table[index_0];
|
|
slope_0[0][sb] = slope_0[1][sb] = slope_0[2][sb] =
|
|
slope * scalefactor;
|
|
offset_0[0][sb] = offset_0[1][sb] = offset_0[2][sb] =
|
|
offset * scalefactor;
|
|
}
|
|
break;
|
|
|
|
case 3:
|
|
index_0 = GetBits(&p_adec->bit_stream,6);
|
|
index_1 = GetBits(&p_adec->bit_stream,6);
|
|
i_read_bits += 12;
|
|
|
|
if (allocation_0[sb] < 0)
|
|
{
|
|
slope_0[0][sb] = adec_scalefactor_table[index_0];
|
|
slope_0[1][sb] = slope_0[2][sb] =
|
|
adec_scalefactor_table[index_1];
|
|
}
|
|
else
|
|
{
|
|
float scalefactor;
|
|
float slope, offset;
|
|
|
|
slope = adec_slope_table[allocation_0[sb]-2];
|
|
offset = adec_offset_table[allocation_0[sb]-2];
|
|
|
|
scalefactor = adec_scalefactor_table[index_0];
|
|
slope_0[0][sb] = slope * scalefactor;
|
|
offset_0[0][sb] = offset * scalefactor;
|
|
|
|
scalefactor = adec_scalefactor_table[index_1];
|
|
slope_0[1][sb] = slope_0[2][sb] = slope * scalefactor;
|
|
offset_0[1][sb] = offset_0[2][sb] =
|
|
offset * scalefactor;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (allocation_1[sb])
|
|
{
|
|
int index_0, index_1, index_2;
|
|
|
|
switch (scfsi_1[sb])
|
|
{
|
|
case 0:
|
|
index_0 = GetBits(&p_adec->bit_stream,6);
|
|
index_1 = GetBits(&p_adec->bit_stream,6);
|
|
index_2 = GetBits(&p_adec->bit_stream,6);
|
|
i_read_bits += 18;
|
|
|
|
if (allocation_1[sb] < 0)
|
|
{
|
|
slope_1[0][sb] = adec_scalefactor_table[index_0];
|
|
slope_1[1][sb] = adec_scalefactor_table[index_1];
|
|
slope_1[2][sb] = adec_scalefactor_table[index_2];
|
|
}
|
|
else
|
|
{
|
|
float scalefactor;
|
|
float slope, offset;
|
|
|
|
slope = adec_slope_table[allocation_1[sb]-2];
|
|
offset = adec_offset_table[allocation_1[sb]-2];
|
|
|
|
scalefactor = adec_scalefactor_table[index_0];
|
|
slope_1[0][sb] = slope * scalefactor;
|
|
offset_1[0][sb] = offset * scalefactor;
|
|
|
|
scalefactor = adec_scalefactor_table[index_1];
|
|
slope_1[1][sb] = slope * scalefactor;
|
|
offset_1[1][sb] = offset * scalefactor;
|
|
|
|
scalefactor = adec_scalefactor_table[index_2];
|
|
slope_1[2][sb] = slope * scalefactor;
|
|
offset_1[2][sb] = offset * scalefactor;
|
|
}
|
|
break;
|
|
|
|
case 1:
|
|
index_0 = GetBits(&p_adec->bit_stream,6);
|
|
index_1 = GetBits(&p_adec->bit_stream,6);
|
|
i_read_bits += 12;
|
|
|
|
if (allocation_1[sb] < 0)
|
|
{
|
|
slope_1[0][sb] = slope_1[1][sb] =
|
|
adec_scalefactor_table[index_0];
|
|
slope_1[2][sb] = adec_scalefactor_table[index_1];
|
|
}
|
|
else
|
|
{
|
|
float scalefactor;
|
|
float slope, offset;
|
|
|
|
slope = adec_slope_table[allocation_1[sb]-2];
|
|
offset = adec_offset_table[allocation_1[sb]-2];
|
|
|
|
scalefactor = adec_scalefactor_table[index_0];
|
|
slope_1[0][sb] = slope_1[1][sb] = slope * scalefactor;
|
|
offset_1[0][sb] = offset_1[1][sb] =
|
|
offset * scalefactor;
|
|
|
|
scalefactor = adec_scalefactor_table[index_1];
|
|
slope_1[2][sb] = slope * scalefactor;
|
|
offset_1[2][sb] = offset * scalefactor;
|
|
}
|
|
break;
|
|
|
|
case 2:
|
|
index_0 = GetBits( &p_adec->bit_stream, 6 );
|
|
i_read_bits += 6;
|
|
|
|
if (allocation_1[sb] < 0)
|
|
{
|
|
slope_1[0][sb] = slope_1[1][sb] = slope_1[2][sb] =
|
|
adec_scalefactor_table[index_0];
|
|
}
|
|
else
|
|
{
|
|
float scalefactor;
|
|
float slope, offset;
|
|
|
|
slope = adec_slope_table[allocation_1[sb]-2];
|
|
offset = adec_offset_table[allocation_1[sb]-2];
|
|
|
|
scalefactor = adec_scalefactor_table[index_0];
|
|
slope_1[0][sb] = slope_1[1][sb] = slope_1[2][sb] =
|
|
slope * scalefactor;
|
|
offset_1[0][sb] = offset_1[1][sb] = offset_1[2][sb] =
|
|
offset * scalefactor;
|
|
}
|
|
break;
|
|
|
|
case 3:
|
|
index_0 = GetBits(&p_adec->bit_stream,6);
|
|
index_1 = GetBits(&p_adec->bit_stream,6);
|
|
i_read_bits += 12;
|
|
|
|
if (allocation_1[sb] < 0)
|
|
{
|
|
slope_1[0][sb] = adec_scalefactor_table[index_0];
|
|
slope_1[1][sb] = slope_1[2][sb] =
|
|
adec_scalefactor_table[index_1];
|
|
}
|
|
else
|
|
{
|
|
float scalefactor;
|
|
float slope, offset;
|
|
|
|
slope = adec_slope_table[allocation_1[sb]-2];
|
|
offset = adec_offset_table[allocation_1[sb]-2];
|
|
|
|
scalefactor = adec_scalefactor_table[index_0];
|
|
slope_1[0][sb] = slope * scalefactor;
|
|
offset_1[0][sb] = offset * scalefactor;
|
|
|
|
scalefactor = adec_scalefactor_table[index_1];
|
|
slope_1[1][sb] = slope_1[2][sb] = slope * scalefactor;
|
|
offset_1[1][sb] = offset_1[2][sb] =
|
|
offset * scalefactor;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* parse samples */
|
|
|
|
for (gr0 = 0; gr0 < 3; gr0++)
|
|
{
|
|
for (gr1 = 0; gr1 < 4; gr1++)
|
|
{
|
|
for (sb = 0; sb < bound; sb++)
|
|
{
|
|
int code;
|
|
|
|
switch (allocation_0[sb])
|
|
{
|
|
case 0:
|
|
sample_0[0][sb] = sample_0[1][sb] = sample_0[2][sb] = 0;
|
|
break;
|
|
|
|
case L3:
|
|
code = GetBits( &p_adec->bit_stream, 5 );
|
|
i_read_bits += 5;
|
|
|
|
sample_0[0][sb] = slope_0[gr0][sb] * L3_table[code % 3];
|
|
code /= 3;
|
|
sample_0[1][sb] = slope_0[gr0][sb] * L3_table[code % 3];
|
|
code /= 3;
|
|
sample_0[2][sb] = slope_0[gr0][sb] * L3_table[code];
|
|
break;
|
|
|
|
case L5:
|
|
code = GetBits( &p_adec->bit_stream, 7 );
|
|
i_read_bits += 7;
|
|
|
|
sample_0[0][sb] = slope_0[gr0][sb] * L5_table[code % 5];
|
|
code /= 5;
|
|
sample_0[1][sb] = slope_0[gr0][sb] * L5_table[code % 5];
|
|
code /= 5;
|
|
sample_0[2][sb] = slope_0[gr0][sb] * L5_table[code];
|
|
break;
|
|
|
|
case L9:
|
|
code = GetBits( &p_adec->bit_stream, 10 );
|
|
i_read_bits += 10;
|
|
|
|
sample_0[0][sb] = slope_0[gr0][sb] * L9_table[code % 9];
|
|
code /= 9;
|
|
sample_0[1][sb] = slope_0[gr0][sb] * L9_table[code % 9];
|
|
code /= 9;
|
|
sample_0[2][sb] = slope_0[gr0][sb] * L9_table[code];
|
|
break;
|
|
|
|
default:
|
|
for (s = 0; s < 3; s++)
|
|
{
|
|
code = GetBits( &p_adec->bit_stream,
|
|
allocation_0[sb] );
|
|
i_read_bits += allocation_0[sb];
|
|
|
|
sample_0[s][sb] =
|
|
slope_0[gr0][sb] * code + offset_0[gr0][sb];
|
|
}
|
|
}
|
|
|
|
switch (allocation_1[sb])
|
|
{
|
|
case 0:
|
|
sample_1[0][sb] = sample_1[1][sb] = sample_1[2][sb] = 0;
|
|
break;
|
|
|
|
case L3:
|
|
code = GetBits( &p_adec->bit_stream, 5 );
|
|
i_read_bits += 5;
|
|
|
|
sample_1[0][sb] = slope_1[gr0][sb] * L3_table[code % 3];
|
|
code /= 3;
|
|
sample_1[1][sb] = slope_1[gr0][sb] * L3_table[code % 3];
|
|
code /= 3;
|
|
sample_1[2][sb] = slope_1[gr0][sb] * L3_table[code];
|
|
break;
|
|
|
|
case L5:
|
|
code = GetBits( &p_adec->bit_stream, 7 );
|
|
i_read_bits += 7;
|
|
|
|
sample_1[0][sb] = slope_1[gr0][sb] * L5_table[code % 5];
|
|
code /= 5;
|
|
sample_1[1][sb] = slope_1[gr0][sb] * L5_table[code % 5];
|
|
code /= 5;
|
|
sample_1[2][sb] = slope_1[gr0][sb] * L5_table[code];
|
|
break;
|
|
|
|
case L9:
|
|
code = GetBits( &p_adec->bit_stream, 10 );
|
|
i_read_bits += 10;
|
|
|
|
sample_1[0][sb] = slope_1[gr0][sb] * L9_table[code % 9];
|
|
code /= 9;
|
|
sample_1[1][sb] = slope_1[gr0][sb] * L9_table[code % 9];
|
|
code /= 9;
|
|
sample_1[2][sb] = slope_1[gr0][sb] * L9_table[code];
|
|
break;
|
|
|
|
default:
|
|
for (s = 0; s < 3; s++)
|
|
{
|
|
code = GetBits( &p_adec->bit_stream,
|
|
allocation_1[sb] );
|
|
i_read_bits += allocation_1[sb];
|
|
|
|
sample_1[s][sb] =
|
|
slope_1[gr0][sb] * code + offset_1[gr0][sb];
|
|
}
|
|
}
|
|
}
|
|
|
|
for (; sb < sblimit; sb++)
|
|
{
|
|
int code;
|
|
|
|
switch (allocation_0[sb])
|
|
{
|
|
case 0:
|
|
sample_0[0][sb] = sample_0[1][sb] = sample_0[2][sb] = 0;
|
|
sample_1[0][sb] = sample_1[1][sb] = sample_1[2][sb] = 0;
|
|
break;
|
|
|
|
case L3:
|
|
code = GetBits( &p_adec->bit_stream, 5 );
|
|
i_read_bits += 5;
|
|
|
|
sample_0[0][sb] = slope_0[gr0][sb] * L3_table[code % 3];
|
|
sample_1[0][sb] = slope_1[gr0][sb] * L3_table[code % 3];
|
|
code /= 3;
|
|
sample_0[1][sb] = slope_0[gr0][sb] * L3_table[code % 3];
|
|
sample_1[1][sb] = slope_1[gr0][sb] * L3_table[code % 3];
|
|
code /= 3;
|
|
sample_0[2][sb] = slope_0[gr0][sb] * L3_table[code];
|
|
sample_1[2][sb] = slope_1[gr0][sb] * L3_table[code];
|
|
break;
|
|
|
|
case L5:
|
|
code = GetBits( &p_adec->bit_stream, 7 );
|
|
i_read_bits += 7;
|
|
|
|
sample_0[0][sb] = slope_0[gr0][sb] * L5_table[code % 5];
|
|
sample_1[0][sb] = slope_1[gr0][sb] * L5_table[code % 5];
|
|
code /= 5;
|
|
sample_0[1][sb] = slope_0[gr0][sb] * L5_table[code % 5];
|
|
sample_1[1][sb] = slope_1[gr0][sb] * L5_table[code % 5];
|
|
code /= 5;
|
|
sample_0[2][sb] = slope_0[gr0][sb] * L5_table[code];
|
|
sample_1[2][sb] = slope_1[gr0][sb] * L5_table[code];
|
|
break;
|
|
|
|
case L9:
|
|
code = GetBits( &p_adec->bit_stream, 10 );
|
|
i_read_bits += 10;
|
|
|
|
sample_0[0][sb] = slope_0[gr0][sb] * L9_table[code % 9];
|
|
sample_1[0][sb] = slope_1[gr0][sb] * L9_table[code % 9];
|
|
code /= 9;
|
|
sample_0[1][sb] = slope_0[gr0][sb] * L9_table[code % 9];
|
|
sample_1[1][sb] = slope_1[gr0][sb] * L9_table[code % 9];
|
|
code /= 9;
|
|
sample_0[2][sb] = slope_0[gr0][sb] * L9_table[code];
|
|
sample_1[2][sb] = slope_1[gr0][sb] * L9_table[code];
|
|
break;
|
|
|
|
default:
|
|
for (s = 0; s < 3; s++)
|
|
{
|
|
code = GetBits( &p_adec->bit_stream,
|
|
allocation_0[sb] );
|
|
i_read_bits += allocation_0[sb];
|
|
|
|
sample_0[s][sb] =
|
|
slope_0[gr0][sb] * code + offset_0[gr0][sb];
|
|
sample_1[s][sb] =
|
|
slope_1[gr0][sb] * code + offset_1[gr0][sb];
|
|
}
|
|
}
|
|
}
|
|
|
|
for (; sb < 32; sb++)
|
|
{
|
|
sample_0[0][sb] = sample_0[1][sb] = sample_0[2][sb] = 0;
|
|
sample_1[0][sb] = sample_1[1][sb] = sample_1[2][sb] = 0;
|
|
}
|
|
|
|
for (s = 0; s < 3; s++)
|
|
{
|
|
DCT32( &p_adec->bank_0, sample_0[s] );
|
|
PCM( &p_adec->bank_0, buffer, 2 );
|
|
|
|
DCT32( &p_adec->bank_1, sample_1[s] );
|
|
PCM( &p_adec->bank_1, buffer + 1, 2 );
|
|
|
|
buffer += 64;
|
|
}
|
|
}
|
|
}
|
|
|
|
p_adec->i_read_bits += i_read_bits;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|