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Member "ffmpeg-3.4.2/libavcodec/aacenctab.h" (31 Dec 2017, 4678 Bytes) of package /linux/misc/ffmpeg-3.4.2.tar.xz:


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    1 /*
    2  * AAC encoder data
    3  * Copyright (c) 2015 Rostislav Pehlivanov ( atomnuker gmail com )
    4  *
    5  * This file is part of FFmpeg.
    6  *
    7  * FFmpeg is free software; you can redistribute it and/or
    8  * modify it under the terms of the GNU Lesser General Public
    9  * License as published by the Free Software Foundation; either
   10  * version 2.1 of the License, or (at your option) any later version.
   11  *
   12  * FFmpeg is distributed in the hope that it will be useful,
   13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   15  * Lesser General Public License for more details.
   16  *
   17  * You should have received a copy of the GNU Lesser General Public
   18  * License along with FFmpeg; if not, write to the Free Software
   19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   20  */
   21 
   22 /**
   23  * @file
   24  * AAC encoder data
   25  * @author Rostislav Pehlivanov ( atomnuker gmail com )
   26  */
   27 
   28 #ifndef AVCODEC_AACENCTAB_H
   29 #define AVCODEC_AACENCTAB_H
   30 
   31 #include "aac.h"
   32 
   33 /** Total number of usable codebooks **/
   34 #define CB_TOT 12
   35 
   36 /** Total number of codebooks, including special ones **/
   37 #define CB_TOT_ALL 15
   38 
   39 #define AAC_MAX_CHANNELS 8
   40 
   41 extern const uint8_t *ff_aac_swb_size_1024[];
   42 extern const int      ff_aac_swb_size_1024_len;
   43 extern const uint8_t *ff_aac_swb_size_128[];
   44 extern const int      ff_aac_swb_size_128_len;
   45 
   46 /** default channel configurations */
   47 static const uint8_t aac_chan_configs[AAC_MAX_CHANNELS][6] = {
   48     {1, TYPE_SCE},                                         // 1 channel  - single channel element
   49     {1, TYPE_CPE},                                         // 2 channels - channel pair
   50     {2, TYPE_SCE, TYPE_CPE},                               // 3 channels - center + stereo
   51     {3, TYPE_SCE, TYPE_CPE, TYPE_SCE},                     // 4 channels - front center + stereo + back center
   52     {3, TYPE_SCE, TYPE_CPE, TYPE_CPE},                     // 5 channels - front center + stereo + back stereo
   53     {4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE},           // 6 channels - front center + stereo + back stereo + LFE
   54     {0},                                                   // 7 channels - invalid without PCE
   55     {5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE}, // 8 channels - front center + front stereo + side stereo + back stereo + LFE
   56 };
   57 
   58 /**
   59  * Table to remap channels from libavcodec's default order to AAC order.
   60  */
   61 static const uint8_t aac_chan_maps[AAC_MAX_CHANNELS][AAC_MAX_CHANNELS] = {
   62     { 0 },
   63     { 0, 1 },
   64     { 2, 0, 1 },
   65     { 2, 0, 1, 3 },
   66     { 2, 0, 1, 3, 4 },
   67     { 2, 0, 1, 4, 5, 3 },
   68     { 0 },
   69     { 2, 0, 1, 6, 7, 4, 5, 3 },
   70 };
   71 
   72 /* duplicated from avpriv_mpeg4audio_sample_rates to avoid shared build
   73  * failures */
   74 static const int mpeg4audio_sample_rates[16] = {
   75     96000, 88200, 64000, 48000, 44100, 32000,
   76     24000, 22050, 16000, 12000, 11025, 8000, 7350
   77 };
   78 
   79 /** bits needed to code codebook run value for long windows */
   80 static const uint8_t run_value_bits_long[64] = {
   81      5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,
   82      5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5, 10,
   83     10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
   84     10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 15
   85 };
   86 
   87 /** bits needed to code codebook run value for short windows */
   88 static const uint8_t run_value_bits_short[16] = {
   89     3, 3, 3, 3, 3, 3, 3, 6, 6, 6, 6, 6, 6, 6, 6, 9
   90 };
   91 
   92 /* TNS starting SFBs for long and short windows */
   93 static const uint8_t tns_min_sfb_short[16] = {
   94     2, 2, 2, 3, 3, 4, 6, 6, 8, 10, 10, 12, 12, 12, 12, 12
   95 };
   96 
   97 static const uint8_t tns_min_sfb_long[16] = {
   98     12, 13, 15, 16, 17, 20, 25, 26, 24, 28, 30, 31, 31, 31, 31, 31
   99 };
  100 
  101 static const uint8_t * const tns_min_sfb[2] = {
  102     tns_min_sfb_long, tns_min_sfb_short
  103 };
  104 
  105 static const uint8_t * const run_value_bits[2] = {
  106     run_value_bits_long, run_value_bits_short
  107 };
  108 
  109 /** Map to convert values from BandCodingPath index to a codebook index **/
  110 static const uint8_t aac_cb_out_map[CB_TOT_ALL]  = {0,1,2,3,4,5,6,7,8,9,10,11,13,14,15};
  111 /** Inverse map to convert from codebooks to BandCodingPath indices **/
  112 static const uint8_t aac_cb_in_map[CB_TOT_ALL+1] = {0,1,2,3,4,5,6,7,8,9,10,11,0,12,13,14};
  113 
  114 static const uint8_t aac_cb_range [12] = {0, 3, 3, 3, 3, 9, 9, 8, 8, 13, 13, 17};
  115 static const uint8_t aac_cb_maxval[12] = {0, 1, 1, 2, 2, 4, 4, 7, 7, 12, 12, 16};
  116 
  117 static const unsigned char aac_maxval_cb[] = {
  118     0, 1, 3, 5, 5, 7, 7, 7, 9, 9, 9, 9, 9, 11
  119 };
  120 
  121 static const int aacenc_profiles[] = {
  122     FF_PROFILE_AAC_MAIN,
  123     FF_PROFILE_AAC_LOW,
  124     FF_PROFILE_AAC_LTP,
  125     FF_PROFILE_MPEG2_AAC_LOW,
  126 };
  127 
  128 #endif /* AVCODEC_AACENCTAB_H */