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 *const ff_aac_swb_size_1024[]; 42 extern const int ff_aac_swb_size_1024_len; 43 extern const uint8_t *const 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 */ 140