"Fossies" - the Fresh Open Source Software Archive

Member "ffmpeg-4.0.1/libavcodec/aacenctab.h" (20 Apr 2018, 4968 Bytes) of package /linux/misc/ffmpeg-4.0.1.tar.xz:


As a special service "Fossies" has tried to format the requested source page into HTML format using (guessed) C and C++ source code syntax highlighting (style: standard) with prefixed line numbers and code folding option. Alternatively you can here view or download the uninterpreted source code file. For more information about "aacenctab.h" see the Fossies "Dox" file reference documentation and the last Fossies "Diffs" side-by-side code changes report: 3.4.2_vs_4.0.

    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 16
   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 /* Supported layouts without using a PCE */
   47 static const int64_t aac_normal_chan_layouts[7] = {
   48     AV_CH_LAYOUT_MONO,
   49     AV_CH_LAYOUT_STEREO,
   50     AV_CH_LAYOUT_SURROUND,
   51     AV_CH_LAYOUT_4POINT0,
   52     AV_CH_LAYOUT_5POINT0_BACK,
   53     AV_CH_LAYOUT_5POINT1_BACK,
   54     AV_CH_LAYOUT_7POINT1,
   55 };
   56 
   57 /** default channel configurations */
   58 static const uint8_t aac_chan_configs[AAC_MAX_CHANNELS][6] = {
   59     {1, TYPE_SCE},                                         // 1 channel  - single channel element
   60     {1, TYPE_CPE},                                         // 2 channels - channel pair
   61     {2, TYPE_SCE, TYPE_CPE},                               // 3 channels - center + stereo
   62     {3, TYPE_SCE, TYPE_CPE, TYPE_SCE},                     // 4 channels - front center + stereo + back center
   63     {3, TYPE_SCE, TYPE_CPE, TYPE_CPE},                     // 5 channels - front center + stereo + back stereo
   64     {4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE},           // 6 channels - front center + stereo + back stereo + LFE
   65     {0},                                                   // 7 channels - invalid without PCE
   66     {5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE}, // 8 channels - front center + front stereo + side stereo + back stereo + LFE
   67 };
   68 
   69 /**
   70  * Table to remap channels from libavcodec's default order to AAC order.
   71  */
   72 static const uint8_t aac_chan_maps[AAC_MAX_CHANNELS][AAC_MAX_CHANNELS] = {
   73     { 0 },
   74     { 0, 1 },
   75     { 2, 0, 1 },
   76     { 2, 0, 1, 3 },
   77     { 2, 0, 1, 3, 4 },
   78     { 2, 0, 1, 4, 5, 3 },
   79     { 0 },
   80     { 2, 0, 1, 6, 7, 4, 5, 3 },
   81 };
   82 
   83 /* duplicated from avpriv_mpeg4audio_sample_rates to avoid shared build
   84  * failures */
   85 static const int mpeg4audio_sample_rates[16] = {
   86     96000, 88200, 64000, 48000, 44100, 32000,
   87     24000, 22050, 16000, 12000, 11025, 8000, 7350
   88 };
   89 
   90 /** bits needed to code codebook run value for long windows */
   91 static const uint8_t run_value_bits_long[64] = {
   92      5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,
   93      5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5, 10,
   94     10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
   95     10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 15
   96 };
   97 
   98 /** bits needed to code codebook run value for short windows */
   99 static const uint8_t run_value_bits_short[16] = {
  100     3, 3, 3, 3, 3, 3, 3, 6, 6, 6, 6, 6, 6, 6, 6, 9
  101 };
  102 
  103 /* TNS starting SFBs for long and short windows */
  104 static const uint8_t tns_min_sfb_short[16] = {
  105     2, 2, 2, 3, 3, 4, 6, 6, 8, 10, 10, 12, 12, 12, 12, 12
  106 };
  107 
  108 static const uint8_t tns_min_sfb_long[16] = {
  109     12, 13, 15, 16, 17, 20, 25, 26, 24, 28, 30, 31, 31, 31, 31, 31
  110 };
  111 
  112 static const uint8_t * const tns_min_sfb[2] = {
  113     tns_min_sfb_long, tns_min_sfb_short
  114 };
  115 
  116 static const uint8_t * const run_value_bits[2] = {
  117     run_value_bits_long, run_value_bits_short
  118 };
  119 
  120 /** Map to convert values from BandCodingPath index to a codebook index **/
  121 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};
  122 /** Inverse map to convert from codebooks to BandCodingPath indices **/
  123 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};
  124 
  125 static const uint8_t aac_cb_range [12] = {0, 3, 3, 3, 3, 9, 9, 8, 8, 13, 13, 17};
  126 static const uint8_t aac_cb_maxval[12] = {0, 1, 1, 2, 2, 4, 4, 7, 7, 12, 12, 16};
  127 
  128 static const unsigned char aac_maxval_cb[] = {
  129     0, 1, 3, 5, 5, 7, 7, 7, 9, 9, 9, 9, 9, 11
  130 };
  131 
  132 static const int aacenc_profiles[] = {
  133     FF_PROFILE_AAC_MAIN,
  134     FF_PROFILE_AAC_LOW,
  135     FF_PROFILE_AAC_LTP,
  136     FF_PROFILE_MPEG2_AAC_LOW,
  137 };
  138 
  139 #endif /* AVCODEC_AACENCTAB_H */