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167 lines
4.6 KiB
167 lines
4.6 KiB
/* |
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* AC-3 tables |
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* copyright (c) 2001 Fabrice Bellard |
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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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* tables taken directly from the AC-3 spec. |
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*/ |
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#include "libavutil/channel_layout.h" |
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#include "ac3tab.h" |
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/** |
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* Possible frame sizes. |
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* from ATSC A/52 Table 5.18 Frame Size Code Table. |
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*/ |
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const uint16_t ff_ac3_frame_size_tab[38][3] = { |
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{ 64, 69, 96 }, |
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{ 64, 70, 96 }, |
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{ 80, 87, 120 }, |
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{ 80, 88, 120 }, |
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{ 96, 104, 144 }, |
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{ 96, 105, 144 }, |
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{ 112, 121, 168 }, |
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{ 112, 122, 168 }, |
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{ 128, 139, 192 }, |
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{ 128, 140, 192 }, |
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{ 160, 174, 240 }, |
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{ 160, 175, 240 }, |
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{ 192, 208, 288 }, |
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{ 192, 209, 288 }, |
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{ 224, 243, 336 }, |
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{ 224, 244, 336 }, |
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{ 256, 278, 384 }, |
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{ 256, 279, 384 }, |
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{ 320, 348, 480 }, |
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{ 320, 349, 480 }, |
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{ 384, 417, 576 }, |
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{ 384, 418, 576 }, |
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{ 448, 487, 672 }, |
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{ 448, 488, 672 }, |
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{ 512, 557, 768 }, |
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{ 512, 558, 768 }, |
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{ 640, 696, 960 }, |
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{ 640, 697, 960 }, |
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{ 768, 835, 1152 }, |
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{ 768, 836, 1152 }, |
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{ 896, 975, 1344 }, |
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{ 896, 976, 1344 }, |
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{ 1024, 1114, 1536 }, |
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{ 1024, 1115, 1536 }, |
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{ 1152, 1253, 1728 }, |
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{ 1152, 1254, 1728 }, |
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{ 1280, 1393, 1920 }, |
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{ 1280, 1394, 1920 }, |
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}; |
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/** |
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* Map audio coding mode (acmod) to number of full-bandwidth channels. |
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* from ATSC A/52 Table 5.8 Audio Coding Mode |
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*/ |
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const uint8_t ff_ac3_channels_tab[8] = { |
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2, 1, 2, 3, 3, 4, 4, 5 |
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}; |
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/** |
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* Table to remap channels from AC-3 order to SMPTE order. |
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* [channel_mode][lfe][ch] |
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*/ |
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const uint8_t ff_ac3_dec_channel_map[8][2][6] = { |
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COMMON_CHANNEL_MAP |
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{ { 0, 1, 2, 3, }, { 0, 1, 4, 2, 3, } }, |
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{ { 0, 2, 1, 3, 4, }, { 0, 2, 1, 5, 3, 4 } }, |
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}; |
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/* possible frequencies */ |
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const int ff_ac3_sample_rate_tab[] = { 48000, 44100, 32000, 0 }; |
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/* possible bitrates */ |
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const uint16_t ff_ac3_bitrate_tab[19] = { |
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32, 40, 48, 56, 64, 80, 96, 112, 128, |
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160, 192, 224, 256, 320, 384, 448, 512, 576, 640 |
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}; |
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/** |
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* Table of bin locations for rematrixing bands |
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* reference: Section 7.5.2 Rematrixing : Frequency Band Definitions |
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*/ |
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const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 }; |
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/** |
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* Table E2.16 Default Coupling Banding Structure |
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*/ |
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const uint8_t ff_eac3_default_cpl_band_struct[18] = { |
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0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1 |
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}; |
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const uint8_t ff_ac3_bap_tab[64]= { |
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0, 1, 1, 1, 1, 1, 2, 2, 3, 3, |
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3, 4, 4, 5, 5, 6, 6, 6, 6, 7, |
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7, 7, 7, 8, 8, 8, 8, 9, 9, 9, |
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9, 10, 10, 10, 10, 11, 11, 11, 11, 12, |
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12, 12, 12, 13, 13, 13, 13, 14, 14, 14, |
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14, 14, 14, 14, 14, 15, 15, 15, 15, 15, |
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15, 15, 15, 15, |
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}; |
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const uint8_t ff_ac3_slow_decay_tab[4]={ |
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0x0f, 0x11, 0x13, 0x15, |
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}; |
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const uint8_t ff_ac3_fast_decay_tab[4]={ |
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0x3f, 0x53, 0x67, 0x7b, |
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}; |
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const uint16_t ff_ac3_slow_gain_tab[4]= { |
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0x540, 0x4d8, 0x478, 0x410, |
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}; |
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const uint16_t ff_ac3_db_per_bit_tab[4]= { |
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0x000, 0x700, 0x900, 0xb00, |
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}; |
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const int16_t ff_ac3_floor_tab[8]= { |
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0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800, |
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}; |
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const uint16_t ff_ac3_fast_gain_tab[8]= { |
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0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400, |
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}; |
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const uint64_t ff_eac3_custom_channel_map_locations[16][2] = { |
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{ 1, AV_CH_FRONT_LEFT }, |
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{ 1, AV_CH_FRONT_CENTER }, |
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{ 1, AV_CH_FRONT_RIGHT }, |
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{ 1, AV_CH_SIDE_LEFT }, |
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{ 1, AV_CH_SIDE_RIGHT }, |
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{ 0, AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER }, |
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{ 0, AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT }, |
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{ 0, AV_CH_BACK_CENTER }, |
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{ 0, AV_CH_TOP_CENTER }, |
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{ 0, AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT }, |
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{ 0, AV_CH_WIDE_LEFT | AV_CH_WIDE_RIGHT }, |
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{ 0, AV_CH_TOP_FRONT_LEFT | AV_CH_TOP_FRONT_RIGHT}, |
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{ 0, AV_CH_TOP_FRONT_CENTER }, |
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{ 0, AV_CH_TOP_BACK_LEFT | AV_CH_TOP_BACK_RIGHT }, |
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{ 0, AV_CH_LOW_FREQUENCY_2 }, |
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{ 1, AV_CH_LOW_FREQUENCY }, |
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};
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