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 "libavutil/channel_layout.h" 32 #include "aac.h" 33 34 /** Total number of usable codebooks **/ 35 #define CB_TOT 12 36 37 /** Total number of codebooks, including special ones **/ 38 #define CB_TOT_ALL 15 39 40 #define AAC_MAX_CHANNELS 16 41 42 extern const uint8_t *const ff_aac_swb_size_1024[]; 43 extern const int ff_aac_swb_size_1024_len; 44 extern const uint8_t *const ff_aac_swb_size_128[]; 45 extern const int ff_aac_swb_size_128_len; 46 47 /* Supported layouts without using a PCE */ 48 static const AVChannelLayout aac_normal_chan_layouts[7] = { 49 AV_CHANNEL_LAYOUT_MONO, 50 AV_CHANNEL_LAYOUT_STEREO, 51 AV_CHANNEL_LAYOUT_SURROUND, 52 AV_CHANNEL_LAYOUT_4POINT0, 53 AV_CHANNEL_LAYOUT_5POINT0_BACK, 54 AV_CHANNEL_LAYOUT_5POINT1_BACK, 55 AV_CHANNEL_LAYOUT_7POINT1, 56 }; 57 58 /** default channel configurations */ 59 static const uint8_t aac_chan_configs[AAC_MAX_CHANNELS][6] = { 60 {1, TYPE_SCE}, // 1 channel - single channel element 61 {1, TYPE_CPE}, // 2 channels - channel pair 62 {2, TYPE_SCE, TYPE_CPE}, // 3 channels - center + stereo 63 {3, TYPE_SCE, TYPE_CPE, TYPE_SCE}, // 4 channels - front center + stereo + back center 64 {3, TYPE_SCE, TYPE_CPE, TYPE_CPE}, // 5 channels - front center + stereo + back stereo 65 {4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE}, // 6 channels - front center + stereo + back stereo + LFE 66 {0}, // 7 channels - invalid without PCE 67 {5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE}, // 8 channels - front center + front stereo + side stereo + back stereo + LFE 68 }; 69 70 /** 71 * Table to remap channels from libavcodec's default order to AAC order. 72 */ 73 static const uint8_t aac_chan_maps[AAC_MAX_CHANNELS][AAC_MAX_CHANNELS] = { 74 { 0 }, 75 { 0, 1 }, 76 { 2, 0, 1 }, 77 { 2, 0, 1, 3 }, 78 { 2, 0, 1, 3, 4 }, 79 { 2, 0, 1, 4, 5, 3 }, 80 { 0 }, 81 { 2, 0, 1, 6, 7, 4, 5, 3 }, 82 }; 83 84 /** bits needed to code codebook run value for long windows */ 85 static const uint8_t run_value_bits_long[64] = { 86 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 87 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 10, 88 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 89 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 15 90 }; 91 92 /** bits needed to code codebook run value for short windows */ 93 static const uint8_t run_value_bits_short[16] = { 94 3, 3, 3, 3, 3, 3, 3, 6, 6, 6, 6, 6, 6, 6, 6, 9 95 }; 96 97 /* TNS starting SFBs for long and short windows */ 98 static const uint8_t tns_min_sfb_short[16] = { 99 2, 2, 2, 3, 3, 4, 6, 6, 8, 10, 10, 12, 12, 12, 12, 12 100 }; 101 102 static const uint8_t tns_min_sfb_long[16] = { 103 12, 13, 15, 16, 17, 20, 25, 26, 24, 28, 30, 31, 31, 31, 31, 31 104 }; 105 106 static const uint8_t * const tns_min_sfb[2] = { 107 tns_min_sfb_long, tns_min_sfb_short 108 }; 109 110 static const uint8_t * const run_value_bits[2] = { 111 run_value_bits_long, run_value_bits_short 112 }; 113 114 /** Map to convert values from BandCodingPath index to a codebook index **/ 115 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}; 116 /** Inverse map to convert from codebooks to BandCodingPath indices **/ 117 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}; 118 119 static const uint8_t aac_cb_range [12] = {0, 3, 3, 3, 3, 9, 9, 8, 8, 13, 13, 17}; 120 static const uint8_t aac_cb_maxval[12] = {0, 1, 1, 2, 2, 4, 4, 7, 7, 12, 12, 16}; 121 122 static const unsigned char aac_maxval_cb[] = { 123 0, 1, 3, 5, 5, 7, 7, 7, 9, 9, 9, 9, 9, 11 124 }; 125 126 static const int aacenc_profiles[] = { 127 FF_PROFILE_AAC_MAIN, 128 FF_PROFILE_AAC_LOW, 129 FF_PROFILE_AAC_LTP, 130 FF_PROFILE_MPEG2_AAC_LOW, 131 }; 132 133 #endif /* AVCODEC_AACENCTAB_H */ 134