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It is small (16 B) and therefore the overhead of exporting it more than outweighs the size savings from not having duplicated symbols: When the symbol is no longer avpriv, one saves twice the size of the string containing the symbols name (2x30 byte), two entries in .dynsym (24 bytes each on x64), one entry in the importing libraries .got and .rela.dyn (8 + 24 bytes on x64) and two entries for the symbol version (2 bytes each) and one hash value in the exporting library (4 bytes). (The exact numbers are of course different for other platforms (e.g. when using dlls), but given that the strings saved alone more than outweigh the array size it can be presumed that this is beneficial for all platforms.) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
251 lines
7.3 KiB
C
251 lines
7.3 KiB
C
/*
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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 "ac3.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_log_add_tab[260]= {
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0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37,
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0x36,0x35,0x34,0x34,0x33,0x32,0x31,0x30,0x2f,0x2f,
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0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x29,0x28,0x27,
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0x26,0x26,0x25,0x24,0x24,0x23,0x23,0x22,0x21,0x21,
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0x20,0x20,0x1f,0x1e,0x1e,0x1d,0x1d,0x1c,0x1c,0x1b,
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0x1b,0x1a,0x1a,0x19,0x19,0x18,0x18,0x17,0x17,0x16,
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0x16,0x15,0x15,0x15,0x14,0x14,0x13,0x13,0x13,0x12,
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0x12,0x12,0x11,0x11,0x11,0x10,0x10,0x10,0x0f,0x0f,
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0x0f,0x0e,0x0e,0x0e,0x0d,0x0d,0x0d,0x0d,0x0c,0x0c,
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0x0c,0x0c,0x0b,0x0b,0x0b,0x0b,0x0a,0x0a,0x0a,0x0a,
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0x0a,0x09,0x09,0x09,0x09,0x09,0x08,0x08,0x08,0x08,
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0x08,0x08,0x07,0x07,0x07,0x07,0x07,0x07,0x06,0x06,
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0x06,0x06,0x06,0x06,0x06,0x06,0x05,0x05,0x05,0x05,
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0x05,0x05,0x05,0x05,0x04,0x04,0x04,0x04,0x04,0x04,
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0x04,0x04,0x04,0x04,0x04,0x03,0x03,0x03,0x03,0x03,
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0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x03,0x02,
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0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,
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0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x02,0x01,0x01,
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0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
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0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
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0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
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};
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const uint16_t ff_ac3_hearing_threshold_tab[AC3_CRITICAL_BANDS][3]= {
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{ 0x04d0,0x04f0,0x0580 },
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{ 0x04d0,0x04f0,0x0580 },
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{ 0x0440,0x0460,0x04b0 },
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{ 0x0400,0x0410,0x0450 },
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{ 0x03e0,0x03e0,0x0420 },
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{ 0x03c0,0x03d0,0x03f0 },
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{ 0x03b0,0x03c0,0x03e0 },
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{ 0x03b0,0x03b0,0x03d0 },
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{ 0x03a0,0x03b0,0x03c0 },
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{ 0x03a0,0x03a0,0x03b0 },
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{ 0x03a0,0x03a0,0x03b0 },
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{ 0x03a0,0x03a0,0x03b0 },
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{ 0x03a0,0x03a0,0x03a0 },
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{ 0x0390,0x03a0,0x03a0 },
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{ 0x0390,0x0390,0x03a0 },
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{ 0x0390,0x0390,0x03a0 },
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{ 0x0380,0x0390,0x03a0 },
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{ 0x0380,0x0380,0x03a0 },
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{ 0x0370,0x0380,0x03a0 },
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{ 0x0370,0x0380,0x03a0 },
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{ 0x0360,0x0370,0x0390 },
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{ 0x0360,0x0370,0x0390 },
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{ 0x0350,0x0360,0x0390 },
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{ 0x0350,0x0360,0x0390 },
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{ 0x0340,0x0350,0x0380 },
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{ 0x0340,0x0350,0x0380 },
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{ 0x0330,0x0340,0x0380 },
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{ 0x0320,0x0340,0x0370 },
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{ 0x0310,0x0320,0x0360 },
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{ 0x0300,0x0310,0x0350 },
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{ 0x02f0,0x0300,0x0340 },
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{ 0x02f0,0x02f0,0x0330 },
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{ 0x02f0,0x02f0,0x0320 },
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{ 0x02f0,0x02f0,0x0310 },
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{ 0x0300,0x02f0,0x0300 },
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{ 0x0310,0x0300,0x02f0 },
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{ 0x0340,0x0320,0x02f0 },
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{ 0x0390,0x0350,0x02f0 },
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{ 0x03e0,0x0390,0x0300 },
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{ 0x0420,0x03e0,0x0310 },
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{ 0x0460,0x0420,0x0330 },
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{ 0x0490,0x0450,0x0350 },
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{ 0x04a0,0x04a0,0x03c0 },
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{ 0x0460,0x0490,0x0410 },
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{ 0x0440,0x0460,0x0470 },
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{ 0x0440,0x0440,0x04a0 },
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{ 0x0520,0x0480,0x0460 },
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{ 0x0800,0x0630,0x0440 },
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{ 0x0840,0x0840,0x0450 },
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{ 0x0840,0x0840,0x04e0 },
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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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