FFmpeg: libavcodec/mpegaudiodata.c Source File

00001 /*
00002  * MPEG Audio common tables
00003  * copyright (c) 2002 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00027 #include "mpegaudiodata.h"
00028 
00029 
00030 const uint16_t ff_mpa_bitrate_tab[2][3][15] = {
00031     { {0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448 },
00032       {0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384 },
00033       {0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320 } },
00034     { {0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256},
00035       {0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160},
00036       {0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160}
00037     }
00038 };
00039 
00040 const uint16_t ff_mpa_freq_tab[3] = { 44100, 48000, 32000 };
00041 
00042 /*******************************************************/
00043 /* half mpeg encoding window (full precision) */
00044 const int32_t ff_mpa_enwindow[257] = {
00045      0,    -1,    -1,    -1,    -1,    -1,    -1,    -2,
00046     -2,    -2,    -2,    -3,    -3,    -4,    -4,    -5,
00047     -5,    -6,    -7,    -7,    -8,    -9,   -10,   -11,
00048    -13,   -14,   -16,   -17,   -19,   -21,   -24,   -26,
00049    -29,   -31,   -35,   -38,   -41,   -45,   -49,   -53,
00050    -58,   -63,   -68,   -73,   -79,   -85,   -91,   -97,
00051   -104,  -111,  -117,  -125,  -132,  -139,  -147,  -154,
00052   -161,  -169,  -176,  -183,  -190,  -196,  -202,  -208,
00053    213,   218,   222,   225,   227,   228,   228,   227,
00054    224,   221,   215,   208,   200,   189,   177,   163,
00055    146,   127,   106,    83,    57,    29,    -2,   -36,
00056    -72,  -111,  -153,  -197,  -244,  -294,  -347,  -401,
00057   -459,  -519,  -581,  -645,  -711,  -779,  -848,  -919,
00058   -991, -1064, -1137, -1210, -1283, -1356, -1428, -1498,
00059  -1567, -1634, -1698, -1759, -1817, -1870, -1919, -1962,
00060  -2001, -2032, -2057, -2075, -2085, -2087, -2080, -2063,
00061   2037,  2000,  1952,  1893,  1822,  1739,  1644,  1535,
00062   1414,  1280,  1131,   970,   794,   605,   402,   185,
00063    -45,  -288,  -545,  -814, -1095, -1388, -1692, -2006,
00064  -2330, -2663, -3004, -3351, -3705, -4063, -4425, -4788,
00065  -5153, -5517, -5879, -6237, -6589, -6935, -7271, -7597,
00066  -7910, -8209, -8491, -8755, -8998, -9219, -9416, -9585,
00067  -9727, -9838, -9916, -9959, -9966, -9935, -9863, -9750,
00068  -9592, -9389, -9139, -8840, -8492, -8092, -7640, -7134,
00069   6574,  5959,  5288,  4561,  3776,  2935,  2037,  1082,
00070     70,  -998, -2122, -3300, -4533, -5818, -7154, -8540,
00071  -9975,-11455,-12980,-14548,-16155,-17799,-19478,-21189,
00072 -22929,-24694,-26482,-28289,-30112,-31947,-33791,-35640,
00073 -37489,-39336,-41176,-43006,-44821,-46617,-48390,-50137,
00074 -51853,-53534,-55178,-56778,-58333,-59838,-61289,-62684,
00075 -64019,-65290,-66494,-67629,-68692,-69679,-70590,-71420,
00076 -72169,-72835,-73415,-73908,-74313,-74630,-74856,-74992,
00077  75038,
00078 };
00079 
00080 /*******************************************************/
00081 /* layer 2 tables */
00082 
00083 const int ff_mpa_sblimit_table[5] = { 27 , 30 , 8, 12 , 30 };
00084 
00085 const int ff_mpa_quant_steps[17] = {
00086     3,     5,    7,    9,    15,
00087     31,    63,  127,  255,   511,
00088     1023,  2047, 4095, 8191, 16383,
00089     32767, 65535
00090 };
00091 
00092 /* we use a negative value if grouped */
00093 const int ff_mpa_quant_bits[17] = {
00094     -5,  -7,  3, -10, 4,
00095      5,  6,  7,  8,  9,
00096     10, 11, 12, 13, 14,
00097     15, 16
00098 };
00099 
00100 /* encoding tables which give the quantization index. Note how it is
00101    possible to store them efficiently ! */
00102 static const unsigned char alloc_table_1[] = {
00103  4,  0,  2,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16,
00104  4,  0,  2,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16,
00105  4,  0,  2,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16,
00106  4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 16,
00107  4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 16,
00108  4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 16,
00109  4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 16,
00110  4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 16,
00111  4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 16,
00112  4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 16,
00113  4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 16,
00114  3,  0,  1,  2,  3,  4,  5, 16,
00115  3,  0,  1,  2,  3,  4,  5, 16,
00116  3,  0,  1,  2,  3,  4,  5, 16,
00117  3,  0,  1,  2,  3,  4,  5, 16,
00118  3,  0,  1,  2,  3,  4,  5, 16,
00119  3,  0,  1,  2,  3,  4,  5, 16,
00120  3,  0,  1,  2,  3,  4,  5, 16,
00121  3,  0,  1,  2,  3,  4,  5, 16,
00122  3,  0,  1,  2,  3,  4,  5, 16,
00123  3,  0,  1,  2,  3,  4,  5, 16,
00124  3,  0,  1,  2,  3,  4,  5, 16,
00125  3,  0,  1,  2,  3,  4,  5, 16,
00126  2,  0,  1, 16,
00127  2,  0,  1, 16,
00128  2,  0,  1, 16,
00129  2,  0,  1, 16,
00130  2,  0,  1, 16,
00131  2,  0,  1, 16,
00132  2,  0,  1, 16,
00133 };
00134 
00135 static const unsigned char alloc_table_3[] = {
00136  4,  0,  1,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
00137  4,  0,  1,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
00138  3,  0,  1,  3,  4,  5,  6,  7,
00139  3,  0,  1,  3,  4,  5,  6,  7,
00140  3,  0,  1,  3,  4,  5,  6,  7,
00141  3,  0,  1,  3,  4,  5,  6,  7,
00142  3,  0,  1,  3,  4,  5,  6,  7,
00143  3,  0,  1,  3,  4,  5,  6,  7,
00144  3,  0,  1,  3,  4,  5,  6,  7,
00145  3,  0,  1,  3,  4,  5,  6,  7,
00146  3,  0,  1,  3,  4,  5,  6,  7,
00147  3,  0,  1,  3,  4,  5,  6,  7,
00148 };
00149 
00150 static const unsigned char alloc_table_4[] = {
00151  4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
00152  4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
00153  4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
00154  4,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
00155  3,  0,  1,  3,  4,  5,  6,  7,
00156  3,  0,  1,  3,  4,  5,  6,  7,
00157  3,  0,  1,  3,  4,  5,  6,  7,
00158  3,  0,  1,  3,  4,  5,  6,  7,
00159  3,  0,  1,  3,  4,  5,  6,  7,
00160  3,  0,  1,  3,  4,  5,  6,  7,
00161  3,  0,  1,  3,  4,  5,  6,  7,
00162  2,  0,  1,  3,
00163  2,  0,  1,  3,
00164  2,  0,  1,  3,
00165  2,  0,  1,  3,
00166  2,  0,  1,  3,
00167  2,  0,  1,  3,
00168  2,  0,  1,  3,
00169  2,  0,  1,  3,
00170  2,  0,  1,  3,
00171  2,  0,  1,  3,
00172  2,  0,  1,  3,
00173  2,  0,  1,  3,
00174  2,  0,  1,  3,
00175  2,  0,  1,  3,
00176  2,  0,  1,  3,
00177  2,  0,  1,  3,
00178  2,  0,  1,  3,
00179  2,  0,  1,  3,
00180  2,  0,  1,  3,
00181 };
00182 
00183 const unsigned char * const ff_mpa_alloc_tables[5] =
00184 { alloc_table_1, alloc_table_1, alloc_table_3, alloc_table_3, alloc_table_4, };