mpegaudiodectab.h

ffmpeg的完整源代码和作者自己写的文档。不但有在Linux的工程哦

/*
 * MPEG Audio decoder
 * copyright (c) 2002 Fabrice Bellard
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file mpegaudiodectab.h
 * mpeg audio layer decoder tables.
 */

#ifndef AVCODEC_MPEGAUDIODECTAB_H
#define AVCODEC_MPEGAUDIODECTAB_H

#include <stdint.h>
#include "mpegaudio.h"

/*******************************************************/
/* layer 3 tables */

/* layer3 scale factor size */
static const uint8_t slen_table[2][16] = {
    { 0, 0, 0, 0, 3, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4 },
    { 0, 1, 2, 3, 0, 1, 2, 3, 1, 2, 3, 1, 2, 3, 2, 3 },
};

/* number of lsf scale factors for a given size */
static const uint8_t lsf_nsf_table[6][3][4] = {
    { {  6,  5,  5, 5 }, {  9,  9,  9, 9 }, {  6,  9,  9, 9 } },
    { {  6,  5,  7, 3 }, {  9,  9, 12, 6 }, {  6,  9, 12, 6 } },
    { { 11, 10,  0, 0 }, { 18, 18,  0, 0 }, { 15, 18,  0, 0 } },
    { {  7,  7,  7, 0 }, { 12, 12, 12, 0 }, {  6, 15, 12, 0 } },
    { {  6,  6,  6, 3 }, { 12,  9,  9, 6 }, {  6, 12,  9, 6 } },
    { {  8,  8,  5, 0 }, { 15, 12,  9, 0 }, {  6, 18,  9, 0 } },
};

/* mpegaudio layer 3 huffman tables */

static const uint16_t mpa_huffcodes_1[4] = {
 0x0001, 0x0001, 0x0001, 0x0000,
};

static const uint8_t mpa_huffbits_1[4] = {
  1,  3,  2,  3,
};

static const uint16_t mpa_huffcodes_2[9] = {
 0x0001, 0x0002, 0x0001, 0x0003, 0x0001, 0x0001, 0x0003, 0x0002,
 0x0000,
};

static const uint8_t mpa_huffbits_2[9] = {
  1,  3,  6,  3,  3,  5,  5,  5,
  6,
};

static const uint16_t mpa_huffcodes_3[9] = {
 0x0003, 0x0002, 0x0001, 0x0001, 0x0001, 0x0001, 0x0003, 0x0002,
 0x0000,
};

static const uint8_t mpa_huffbits_3[9] = {
  2,  2,  6,  3,  2,  5,  5,  5,
  6,
};

static const uint16_t mpa_huffcodes_5[16] = {
 0x0001, 0x0002, 0x0006, 0x0005, 0x0003, 0x0001, 0x0004, 0x0004,
 0x0007, 0x0005, 0x0007, 0x0001, 0x0006, 0x0001, 0x0001, 0x0000,
};

static const uint8_t mpa_huffbits_5[16] = {
  1,  3,  6,  7,  3,  3,  6,  7,
  6,  6,  7,  8,  7,  6,  7,  8,
};

static const uint16_t mpa_huffcodes_6[16] = {
 0x0007, 0x0003, 0x0005, 0x0001, 0x0006, 0x0002, 0x0003, 0x0002,
 0x0005, 0x0004, 0x0004, 0x0001, 0x0003, 0x0003, 0x0002, 0x0000,
};

static const uint8_t mpa_huffbits_6[16] = {
  3,  3,  5,  7,  3,  2,  4,  5,
  4,  4,  5,  6,  6,  5,  6,  7,
};

static const uint16_t mpa_huffcodes_7[36] = {
 0x0001, 0x0002, 0x000a, 0x0013, 0x0010, 0x000a, 0x0003, 0x0003,
 0x0007, 0x000a, 0x0005, 0x0003, 0x000b, 0x0004, 0x000d, 0x0011,
 0x0008, 0x0004, 0x000c, 0x000b, 0x0012, 0x000f, 0x000b, 0x0002,
 0x0007, 0x0006, 0x0009, 0x000e, 0x0003, 0x0001, 0x0006, 0x0004,
 0x0005, 0x0003, 0x0002, 0x0000,
};

static const uint8_t mpa_huffbits_7[36] = {
  1,  3,  6,  8,  8,  9,  3,  4,
  6,  7,  7,  8,  6,  5,  7,  8,
  8,  9,  7,  7,  8,  9,  9,  9,
  7,  7,  8,  9,  9, 10,  8,  8,
  9, 10, 10, 10,
};

static const uint16_t mpa_huffcodes_8[36] = {
 0x0003, 0x0004, 0x0006, 0x0012, 0x000c, 0x0005, 0x0005, 0x0001,
 0x0002, 0x0010, 0x0009, 0x0003, 0x0007, 0x0003, 0x0005, 0x000e,
 0x0007, 0x0003, 0x0013, 0x0011, 0x000f, 0x000d, 0x000a, 0x0004,
 0x000d, 0x0005, 0x0008, 0x000b, 0x0005, 0x0001, 0x000c, 0x0004,
 0x0004, 0x0001, 0x0001, 0x0000,
};

static const uint8_t mpa_huffbits_8[36] = {
  2,  3,  6,  8,  8,  9,  3,  2,
  4,  8,  8,  8,  6,  4,  6,  8,
  8,  9,  8,  8,  8,  9,  9, 10,
  8,  7,  8,  9, 10, 10,  9,  8,
  9,  9, 11, 11,
};

static const uint16_t mpa_huffcodes_9[36] = {
 0x0007, 0x0005, 0x0009, 0x000e, 0x000f, 0x0007, 0x0006, 0x0004,
 0x0005, 0x0005, 0x0006, 0x0007, 0x0007, 0x0006, 0x0008, 0x0008,
 0x0008, 0x0005, 0x000f, 0x0006, 0x0009, 0x000a, 0x0005, 0x0001,
 0x000b, 0x0007, 0x0009, 0x0006, 0x0004, 0x0001, 0x000e, 0x0004,
 0x0006, 0x0002, 0x0006, 0x0000,
};

static const uint8_t mpa_huffbits_9[36] = {
  3,  3,  5,  6,  8,  9,  3,  3,
  4,  5,  6,  8,  4,  4,  5,  6,
  7,  8,  6,  5,  6,  7,  7,  8,
  7,  6,  7,  7,  8,  9,  8,  7,
  8,  8,  9,  9,
};

static const uint16_t mpa_huffcodes_10[64] = {
 0x0001, 0x0002, 0x000a, 0x0017, 0x0023, 0x001e, 0x000c, 0x0011,
 0x0003, 0x0003, 0x0008, 0x000c, 0x0012, 0x0015, 0x000c, 0x0007,
 0x000b, 0x0009, 0x000f, 0x0015, 0x0020, 0x0028, 0x0013, 0x0006,
 0x000e, 0x000d, 0x0016, 0x0022, 0x002e, 0x0017, 0x0012, 0x0007,
 0x0014, 0x0013, 0x0021, 0x002f, 0x001b, 0x0016, 0x0009, 0x0003,
 0x001f, 0x0016, 0x0029, 0x001a, 0x0015, 0x0014, 0x0005, 0x0003,
 0x000e, 0x000d, 0x000a, 0x000b, 0x0010, 0x0006, 0x0005, 0x0001,
 0x0009, 0x0008, 0x0007, 0x0008, 0x0004, 0x0004, 0x0002, 0x0000,
};

static const uint8_t mpa_huffbits_10[64] = {
  1,  3,  6,  8,  9,  9,  9, 10,
  3,  4,  6,  7,  8,  9,  8,  8,
  6,  6,  7,  8,  9, 10,  9,  9,
  7,  7,  8,  9, 10, 10,  9, 10,
  8,  8,  9, 10, 10, 10, 10, 10,
  9,  9, 10, 10, 11, 11, 10, 11,
  8,  8,  9, 10, 10, 10, 11, 11,
  9,  8,  9, 10, 10, 11, 11, 11,
};

static const uint16_t mpa_huffcodes_11[64] = {
 0x0003, 0x0004, 0x000a, 0x0018, 0x0022, 0x0021, 0x0015, 0x000f,
 0x0005, 0x0003, 0x0004, 0x000a, 0x0020, 0x0011, 0x000b, 0x000a,
 0x000b, 0x0007, 0x000d, 0x0012, 0x001e, 0x001f, 0x0014, 0x0005,
 0x0019, 0x000b, 0x0013, 0x003b, 0x001b, 0x0012, 0x000c, 0x0005,
 0x0023, 0x0021, 0x001f, 0x003a, 0x001e, 0x0010, 0x0007, 0x0005,
 0x001c, 0x001a, 0x0020, 0x0013, 0x0011, 0x000f, 0x0008, 0x000e,
 0x000e, 0x000c, 0x0009, 0x000d, 0x000e, 0x0009, 0x0004, 0x0001,
 0x000b, 0x0004, 0x0006, 0x0006, 0x0006, 0x0003, 0x0002, 0x0000,
};

static const uint8_t mpa_huffbits_11[64] = {
  2,  3,  5,  7,  8,  9,  8,  9,
  3,  3,  4,  6,  8,  8,  7,  8,
  5,  5,  6,  7,  8,  9,  8,  8,
  7,  6,  7,  9,  8, 10,  8,  9,
  8,  8,  8,  9,  9, 10,  9, 10,
  8,  8,  9, 10, 10, 11, 10, 11,
  8,  7,  7,  8,  9, 10, 10, 10,
  8,  7,  8,  9, 10, 10, 10, 10,
};

static const uint16_t mpa_huffcodes_12[64] = {
 0x0009, 0x0006, 0x0010, 0x0021, 0x0029, 0x0027, 0x0026, 0x001a,
 0x0007, 0x0005, 0x0006, 0x0009, 0x0017, 0x0010, 0x001a, 0x000b,
 0x0011, 0x0007, 0x000b, 0x000e, 0x0015, 0x001e, 0x000a, 0x0007,
 0x0011, 0x000a, 0x000f, 0x000c, 0x0012, 0x001c, 0x000e, 0x0005,
 0x0020, 0x000d, 0x0016, 0x0013, 0x0012, 0x0010, 0x0009, 0x0005,
 0x0028, 0x0011, 0x001f, 0x001d, 0x0011, 0x000d, 0x0004, 0x0002,
 0x001b, 0x000c, 0x000b, 0x000f, 0x000a, 0x0007, 0x0004, 0x0001,
 0x001b, 0x000c, 0x0008, 0x000c, 0x0006, 0x0003, 0x0001, 0x0000,
};

static const uint8_t mpa_huffbits_12[64] = {
  4,  3,  5,  7,  8,  9,  9,  9,
  3,  3,  4,  5,  7,  7,  8,  8,
  5,  4,  5,  6,  7,  8,  7,  8,
  6,  5,  6,  6,  7,  8,  8,  8,
  7,  6,  7,  7,  8,  8,  8,  9,
  8,  7,  8,  8,  8,  9,  8,  9,
  8,  7,  7,  8,  8,  9,  9, 10,
  9,  8,  8,  9,  9,  9,  9, 10,
};

static const uint16_t mpa_huffcodes_13[256] = {
 0x0001, 0x0005, 0x000e, 0x0015, 0x0022, 0x0033, 0x002e, 0x0047,
 0x002a, 0x0034, 0x0044, 0x0034, 0x0043, 0x002c, 0x002b, 0x0013,
 0x0003, 0x0004, 0x000c, 0x0013, 0x001f, 0x001a, 0x002c, 0x0021,
 0x001f, 0x0018, 0x0020, 0x0018, 0x001f, 0x0023, 0x0016, 0x000e,
 0x000f, 0x000d, 0x0017, 0x0024, 0x003b, 0x0031, 0x004d, 0x0041,
 0x001d, 0x0028, 0x001e, 0x0028, 0x001b, 0x0021, 0x002a, 0x0010,
 0x0016, 0x0014, 0x0025, 0x003d, 0x0038, 0x004f, 0x0049, 0x0040,
 0x002b, 0x004c, 0x0038, 0x0025, 0x001a, 0x001f, 0x0019, 0x000e,
 0x0023, 0x0010, 0x003c, 0x0039, 0x0061, 0x004b, 0x0072, 0x005b,
 0x0036, 0x0049, 0x0037, 0x0029, 0x0030, 0x0035, 0x0017, 0x0018,
 0x003a, 0x001b, 0x0032, 0x0060, 0x004c, 0x0046, 0x005d, 0x0054,
 0x004d, 0x003a, 0x004f, 0x001d, 0x004a, 0x0031, 0x0029, 0x0011,
 0x002f, 0x002d, 0x004e, 0x004a, 0x0073, 0x005e, 0x005a, 0x004f,
 0x0045, 0x0053, 0x0047, 0x0032, 0x003b, 0x0026, 0x0024, 0x000f,
 0x0048, 0x0022, 0x0038, 0x005f, 0x005c, 0x0055, 0x005b, 0x005a,
 0x0056, 0x0049, 0x004d, 0x0041, 0x0033, 0x002c, 0x002b, 0x002a,
 0x002b, 0x0014, 0x001e, 0x002c, 0x0037, 0x004e, 0x0048, 0x0057,
 0x004e, 0x003d, 0x002e, 0x0036, 0x0025, 0x001e, 0x0014, 0x0010,
 0x0035, 0x0019, 0x0029, 0x0025, 0x002c, 0x003b, 0x0036, 0x0051,
 0x0042, 0x004c, 0x0039, 0x0036, 0x0025, 0x0012, 0x0027, 0x000b,
 0x0023, 0x0021, 0x001f, 0x0039, 0x002a, 0x0052, 0x0048, 0x0050,
 0x002f, 0x003a, 0x0037, 0x0015, 0x0016, 0x001a, 0x0026, 0x0016,
 0x0035, 0x0019, 0x0017, 0x0026, 0x0046, 0x003c, 0x0033, 0x0024,
 0x0037, 0x001a, 0x0022, 0x0017, 0x001b, 0x000e, 0x0009, 0x0007,
 0x0022, 0x0020, 0x001c, 0x0027, 0x0031, 0x004b, 0x001e, 0x0034,
 0x0030, 0x0028, 0x0034, 0x001c, 0x0012, 0x0011, 0x0009, 0x0005,
 0x002d, 0x0015, 0x0022, 0x0040, 0x0038, 0x0032, 0x0031, 0x002d,
 0x001f, 0x0013, 0x000c, 0x000f, 0x000a, 0x0007, 0x0006, 0x0003,
 0x0030, 0x0017, 0x0014, 0x0027, 0x0024, 0x0023, 0x0035, 0x0015,
 0x0010, 0x0017, 0x000d, 0x000a, 0x0006, 0x0001, 0x0004, 0x0002,
 0x0010, 0x000f, 0x0011, 0x001b, 0x0019, 0x0014, 0x001d, 0x000b,
 0x0011, 0x000c, 0x0010, 0x0008, 0x0001, 0x0001, 0x0000, 0x0001,
};

static const uint8_t mpa_huffbits_13[256] = {
  1,  4,  6,  7,  8,  9,  9, 10,
  9, 10, 11, 11, 12, 12, 13, 13,
  3,  4,  6,  7,  8,  8,  9,  9,
  9,  9, 10, 10, 11, 12, 12, 12,
  6,  6,  7,  8,  9,  9, 10, 10,
  9, 10, 10, 11, 11, 12, 13, 13,
  7,  7,  8,  9,  9, 10, 10, 10,
 10, 11, 11, 11, 11, 12, 13, 13,
  8,  7,  9,  9, 10, 10, 11, 11,
 10, 11, 11, 12, 12, 13, 13, 14,
  9,  8,  9, 10, 10, 10, 11, 11,
 11, 11, 12, 11, 13, 13, 14, 14,
  9,  9, 10, 10, 11, 11, 11, 11,
 11, 12, 12, 12, 13, 13, 14, 14,
 10,  9, 10, 11, 11, 11, 12, 12,
 12, 12, 13, 13, 13, 14, 16, 16,
  9,  8,  9, 10, 10, 11, 11, 12,
 12, 12, 12, 13, 13, 14, 15, 15,
 10,  9, 10, 10, 11, 11, 11, 13,
 12, 13, 13, 14, 14, 14, 16, 15,
 10, 10, 10, 11, 11, 12, 12, 13,
 12, 13, 14, 13, 14, 15, 16, 17,
 11, 10, 10, 11, 12, 12, 12, 12,
 13, 13, 13, 14, 15, 15, 15, 16,
 11, 11, 11, 12, 12, 13, 12, 13,
 14, 14, 15, 15, 15, 16, 16, 16,
 12, 11, 12, 13, 13, 13, 14, 14,
 14, 14, 14, 15, 16, 15, 16, 16,
 13, 12, 12, 13, 13, 13, 15, 14,
 14, 17, 15, 15, 15, 17, 16, 16,
 12, 12, 13, 14, 14, 14, 15, 14,
 15, 15, 16, 16, 19, 18, 19, 16,
};

static const uint16_t mpa_huffcodes_15[256] = {
 0x0007, 0x000c, 0x0012, 0x0035, 0x002f, 0x004c, 0x007c, 0x006c,
 0x0059, 0x007b, 0x006c, 0x0077, 0x006b, 0x0051, 0x007a, 0x003f,
 0x000d, 0x0005, 0x0010, 0x001b, 0x002e, 0x0024, 0x003d, 0x0033,
 0x002a, 0x0046, 0x0034, 0x0053, 0x0041, 0x0029, 0x003b, 0x0024,
 0x0013, 0x0011, 0x000f, 0x0018, 0x0029, 0x0022, 0x003b, 0x0030,
 0x0028, 0x0040, 0x0032, 0x004e, 0x003e, 0x0050, 0x0038, 0x0021,
 0x001d, 0x001c, 0x0019, 0x002b, 0x0027, 0x003f, 0x0037, 0x005d,
 0x004c, 0x003b, 0x005d, 0x0048, 0x0036, 0x004b, 0x0032, 0x001d,
 0x0034, 0x0016, 0x002a, 0x0028, 0x0043, 0x0039, 0x005f, 0x004f,
 0x0048, 0x0039, 0x0059, 0x0045, 0x0031, 0x0042, 0x002e, 0x001b,
 0x004d, 0x0025, 0x0023, 0x0042, 0x003a, 0x0034, 0x005b, 0x004a,
 0x003e, 0x0030, 0x004f, 0x003f, 0x005a, 0x003e, 0x0028, 0x0026,
 0x007d, 0x0020, 0x003c, 0x0038, 0x0032, 0x005c, 0x004e, 0x0041,
 0x0037, 0x0057, 0x0047, 0x0033, 0x0049, 0x0033, 0x0046, 0x001e,
 0x006d, 0x0035, 0x0031, 0x005e, 0x0058, 0x004b, 0x0042, 0x007a,
 0x005b, 0x0049, 0x0038, 0x002a, 0x0040, 0x002c, 0x0015, 0x0019,
 0x005a, 0x002b, 0x0029, 0x004d, 0x0049, 0x003f, 0x0038, 0x005c,
 0x004d, 0x0042, 0x002f, 0x0043, 0x0030, 0x0035, 0x0024, 0x0014,