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133 lines
4.7 KiB
133 lines
4.7 KiB
/* |
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* AAC encoder data |
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* Copyright (c) 2015 Rostislav Pehlivanov ( atomnuker gmail com ) |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* AAC encoder data |
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* @author Rostislav Pehlivanov ( atomnuker gmail com ) |
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*/ |
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#ifndef AVCODEC_AACENCTAB_H |
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#define AVCODEC_AACENCTAB_H |
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#include "libavutil/channel_layout.h" |
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#include "aac.h" |
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/** Total number of usable codebooks **/ |
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#define CB_TOT 12 |
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/** Total number of codebooks, including special ones **/ |
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#define CB_TOT_ALL 15 |
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#define AAC_MAX_CHANNELS 16 |
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extern const uint8_t *const ff_aac_swb_size_1024[]; |
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extern const int ff_aac_swb_size_1024_len; |
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extern const uint8_t *const ff_aac_swb_size_128[]; |
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extern const int ff_aac_swb_size_128_len; |
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/* Supported layouts without using a PCE */ |
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static const AVChannelLayout aac_normal_chan_layouts[7] = { |
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AV_CHANNEL_LAYOUT_MONO, |
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AV_CHANNEL_LAYOUT_STEREO, |
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AV_CHANNEL_LAYOUT_SURROUND, |
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AV_CHANNEL_LAYOUT_4POINT0, |
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AV_CHANNEL_LAYOUT_5POINT0_BACK, |
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AV_CHANNEL_LAYOUT_5POINT1_BACK, |
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AV_CHANNEL_LAYOUT_7POINT1, |
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}; |
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/** default channel configurations */ |
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static const uint8_t aac_chan_configs[AAC_MAX_CHANNELS][6] = { |
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{1, TYPE_SCE}, // 1 channel - single channel element |
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{1, TYPE_CPE}, // 2 channels - channel pair |
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{2, TYPE_SCE, TYPE_CPE}, // 3 channels - center + stereo |
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{3, TYPE_SCE, TYPE_CPE, TYPE_SCE}, // 4 channels - front center + stereo + back center |
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{3, TYPE_SCE, TYPE_CPE, TYPE_CPE}, // 5 channels - front center + stereo + back stereo |
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{4, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_LFE}, // 6 channels - front center + stereo + back stereo + LFE |
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{0}, // 7 channels - invalid without PCE |
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{5, TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_LFE}, // 8 channels - front center + front stereo + side stereo + back stereo + LFE |
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}; |
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/** |
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* Table to remap channels from libavcodec's default order to AAC order. |
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*/ |
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static const uint8_t aac_chan_maps[AAC_MAX_CHANNELS][AAC_MAX_CHANNELS] = { |
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{ 0 }, |
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{ 0, 1 }, |
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{ 2, 0, 1 }, |
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{ 2, 0, 1, 3 }, |
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{ 2, 0, 1, 3, 4 }, |
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{ 2, 0, 1, 4, 5, 3 }, |
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{ 0 }, |
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{ 2, 0, 1, 6, 7, 4, 5, 3 }, |
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}; |
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/** bits needed to code codebook run value for long windows */ |
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static const uint8_t run_value_bits_long[64] = { |
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5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, |
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5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 10, |
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10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, |
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10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 15 |
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}; |
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/** bits needed to code codebook run value for short windows */ |
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static const uint8_t run_value_bits_short[16] = { |
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3, 3, 3, 3, 3, 3, 3, 6, 6, 6, 6, 6, 6, 6, 6, 9 |
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}; |
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/* TNS starting SFBs for long and short windows */ |
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static const uint8_t tns_min_sfb_short[16] = { |
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2, 2, 2, 3, 3, 4, 6, 6, 8, 10, 10, 12, 12, 12, 12, 12 |
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}; |
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static const uint8_t tns_min_sfb_long[16] = { |
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12, 13, 15, 16, 17, 20, 25, 26, 24, 28, 30, 31, 31, 31, 31, 31 |
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}; |
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static const uint8_t * const tns_min_sfb[2] = { |
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tns_min_sfb_long, tns_min_sfb_short |
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}; |
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static const uint8_t * const run_value_bits[2] = { |
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run_value_bits_long, run_value_bits_short |
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}; |
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/** Map to convert values from BandCodingPath index to a codebook index **/ |
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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}; |
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/** Inverse map to convert from codebooks to BandCodingPath indices **/ |
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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}; |
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static const uint8_t aac_cb_range [12] = {0, 3, 3, 3, 3, 9, 9, 8, 8, 13, 13, 17}; |
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static const uint8_t aac_cb_maxval[12] = {0, 1, 1, 2, 2, 4, 4, 7, 7, 12, 12, 16}; |
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static const unsigned char aac_maxval_cb[] = { |
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0, 1, 3, 5, 5, 7, 7, 7, 9, 9, 9, 9, 9, 11 |
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}; |
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static const int aacenc_profiles[] = { |
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FF_PROFILE_AAC_MAIN, |
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FF_PROFILE_AAC_LOW, |
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FF_PROFILE_AAC_LTP, |
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FF_PROFILE_MPEG2_AAC_LOW, |
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}; |
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#endif /* AVCODEC_AACENCTAB_H */
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