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/*
* AC-3 tables
* copyright (c) 2001 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* tables taken directly from the AC-3 spec.
*/
#include "libavutil/channel_layout.h"
#include "ac3tab.h"
/**
* Possible frame sizes.
* from ATSC A/52 Table 5.18 Frame Size Code Table.
*/
const uint16_t ff_ac3_frame_size_tab[38][3] = {
{ 64, 69, 96 },
{ 64, 70, 96 },
{ 80, 87, 120 },
{ 80, 88, 120 },
{ 96, 104, 144 },
{ 96, 105, 144 },
{ 112, 121, 168 },
{ 112, 122, 168 },
{ 128, 139, 192 },
{ 128, 140, 192 },
{ 160, 174, 240 },
{ 160, 175, 240 },
{ 192, 208, 288 },
{ 192, 209, 288 },
{ 224, 243, 336 },
{ 224, 244, 336 },
{ 256, 278, 384 },
{ 256, 279, 384 },
{ 320, 348, 480 },
{ 320, 349, 480 },
{ 384, 417, 576 },
{ 384, 418, 576 },
{ 448, 487, 672 },
{ 448, 488, 672 },
{ 512, 557, 768 },
{ 512, 558, 768 },
{ 640, 696, 960 },
{ 640, 697, 960 },
{ 768, 835, 1152 },
{ 768, 836, 1152 },
{ 896, 975, 1344 },
{ 896, 976, 1344 },
{ 1024, 1114, 1536 },
{ 1024, 1115, 1536 },
{ 1152, 1253, 1728 },
{ 1152, 1254, 1728 },
{ 1280, 1393, 1920 },
{ 1280, 1394, 1920 },
};
/**
* Map audio coding mode (acmod) to number of full-bandwidth channels.
* from ATSC A/52 Table 5.8 Audio Coding Mode
*/
const uint8_t ff_ac3_channels_tab[8] = {
2, 1, 2, 3, 3, 4, 4, 5
};
/**
* Table to remap channels from AC-3 order to SMPTE order.
* [channel_mode][lfe][ch]
*/
const uint8_t ff_ac3_dec_channel_map[8][2][6] = {
COMMON_CHANNEL_MAP
{ { 0, 1, 2, 3, }, { 0, 1, 4, 2, 3, } },
{ { 0, 2, 1, 3, 4, }, { 0, 2, 1, 5, 3, 4 } },
};
/* possible frequencies */
const int ff_ac3_sample_rate_tab[] = { 48000, 44100, 32000, 0 };
/* possible bitrates */
const uint16_t ff_ac3_bitrate_tab[19] = {
32, 40, 48, 56, 64, 80, 96, 112, 128,
160, 192, 224, 256, 320, 384, 448, 512, 576, 640
};
/**
* Table of bin locations for rematrixing bands
* reference: Section 7.5.2 Rematrixing : Frequency Band Definitions
*/
const uint8_t ff_ac3_rematrix_band_tab[5] = { 13, 25, 37, 61, 253 };
/**
* Table E2.16 Default Coupling Banding Structure
*/
const uint8_t ff_eac3_default_cpl_band_struct[18] = {
0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1
};
const uint8_t ff_ac3_bap_tab[64]= {
0, 1, 1, 1, 1, 1, 2, 2, 3, 3,
3, 4, 4, 5, 5, 6, 6, 6, 6, 7,
7, 7, 7, 8, 8, 8, 8, 9, 9, 9,
9, 10, 10, 10, 10, 11, 11, 11, 11, 12,
12, 12, 12, 13, 13, 13, 13, 14, 14, 14,
14, 14, 14, 14, 14, 15, 15, 15, 15, 15,
15, 15, 15, 15,
};
const uint8_t ff_ac3_slow_decay_tab[4]={
0x0f, 0x11, 0x13, 0x15,
};
const uint8_t ff_ac3_fast_decay_tab[4]={
0x3f, 0x53, 0x67, 0x7b,
};
const uint16_t ff_ac3_slow_gain_tab[4]= {
0x540, 0x4d8, 0x478, 0x410,
};
const uint16_t ff_ac3_db_per_bit_tab[4]= {
0x000, 0x700, 0x900, 0xb00,
};
const int16_t ff_ac3_floor_tab[8]= {
0x2f0, 0x2b0, 0x270, 0x230, 0x1f0, 0x170, 0x0f0, 0xf800,
};
const uint16_t ff_ac3_fast_gain_tab[8]= {
0x080, 0x100, 0x180, 0x200, 0x280, 0x300, 0x380, 0x400,
};
const uint64_t ff_eac3_custom_channel_map_locations[16][2] = {
{ 1, AV_CH_FRONT_LEFT },
{ 1, AV_CH_FRONT_CENTER },
{ 1, AV_CH_FRONT_RIGHT },
{ 1, AV_CH_SIDE_LEFT },
{ 1, AV_CH_SIDE_RIGHT },
{ 0, AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER },
{ 0, AV_CH_BACK_LEFT | AV_CH_BACK_RIGHT },
{ 0, AV_CH_BACK_CENTER },
{ 0, AV_CH_TOP_CENTER },
{ 0, AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT },
{ 0, AV_CH_WIDE_LEFT | AV_CH_WIDE_RIGHT },
{ 0, AV_CH_TOP_FRONT_LEFT | AV_CH_TOP_FRONT_RIGHT},
{ 0, AV_CH_TOP_FRONT_CENTER },
{ 0, AV_CH_TOP_BACK_LEFT | AV_CH_TOP_BACK_RIGHT },
{ 0, AV_CH_LOW_FREQUENCY_2 },
{ 1, AV_CH_LOW_FREQUENCY },
};
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