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104abea646
Move AC3HeaderInfo into ac3_parser_internal.h and the rest into a new header ac3defs.h. This also breaks an include cycle of ac3.h and ac3tab.h (the latter now only needs ac3defs.h). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
295 lines
9.9 KiB
C
295 lines
9.9 KiB
C
/*
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* Common code between the AC-3 encoder and decoder
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* Copyright (c) 2000 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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* Common code between the AC-3 encoder and decoder.
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*/
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#include "libavutil/error.h"
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#include "libavutil/macros.h"
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#include "ac3.h"
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#include "ac3defs.h"
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/**
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* Starting frequency coefficient bin for each critical band.
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*/
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const uint8_t ff_ac3_band_start_tab[AC3_CRITICAL_BANDS+1] = {
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
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20, 21, 22, 23, 24, 25, 26, 27, 28, 31,
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34, 37, 40, 43, 46, 49, 55, 61, 67, 73,
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79, 85, 97, 109, 121, 133, 157, 181, 205, 229, 253
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};
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/**
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* Map each frequency coefficient bin to the critical band that contains it.
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*/
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const uint8_t ff_ac3_bin_to_band_tab[253] = {
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0,
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1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
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13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
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25, 26, 27, 28, 28, 28, 29, 29, 29, 30, 30, 30,
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31, 31, 31, 32, 32, 32, 33, 33, 33, 34, 34, 34,
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35, 35, 35, 35, 35, 35, 36, 36, 36, 36, 36, 36,
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37, 37, 37, 37, 37, 37, 38, 38, 38, 38, 38, 38,
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39, 39, 39, 39, 39, 39, 40, 40, 40, 40, 40, 40,
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41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41,
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42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42,
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43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43, 43,
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44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44,
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45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45,
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45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45, 45,
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46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46,
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46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46,
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47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47,
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47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47, 47,
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48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48,
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48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48,
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49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49,
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49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49, 49
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};
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static const uint8_t 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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static const uint16_t 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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static inline int calc_lowcomp1(int a, int b0, int b1, int c)
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{
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if ((b0 + 256) == b1) {
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a = c;
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} else if (b0 > b1) {
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a = FFMAX(a - 64, 0);
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}
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return a;
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}
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static inline int calc_lowcomp(int a, int b0, int b1, int bin)
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{
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if (bin < 7) {
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return calc_lowcomp1(a, b0, b1, 384);
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} else if (bin < 20) {
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return calc_lowcomp1(a, b0, b1, 320);
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} else {
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return FFMAX(a - 128, 0);
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}
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}
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void ff_ac3_bit_alloc_calc_psd(int8_t *exp, int start, int end, int16_t *psd,
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int16_t *band_psd)
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{
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int bin, band;
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/* exponent mapping to PSD */
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for (bin = start; bin < end; bin++) {
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psd[bin]=(3072 - (exp[bin] << 7));
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}
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/* PSD integration */
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bin = start;
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band = ff_ac3_bin_to_band_tab[start];
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do {
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int v = psd[bin++];
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int band_end = FFMIN(ff_ac3_band_start_tab[band+1], end);
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for (; bin < band_end; bin++) {
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int max = FFMAX(v, psd[bin]);
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/* logadd */
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int adr = FFMIN(max - ((v + psd[bin] + 1) >> 1), 255);
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v = max + ac3_log_add_tab[adr];
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}
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band_psd[band++] = v;
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} while (end > ff_ac3_band_start_tab[band]);
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}
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int ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd,
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int start, int end, int fast_gain, int is_lfe,
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int dba_mode, int dba_nsegs, uint8_t *dba_offsets,
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uint8_t *dba_lengths, uint8_t *dba_values,
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int16_t *mask)
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{
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int16_t excite[AC3_CRITICAL_BANDS]; /* excitation */
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int band;
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int band_start, band_end, begin, end1;
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int lowcomp, fastleak, slowleak;
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if (end <= 0)
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return AVERROR_INVALIDDATA;
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/* excitation function */
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band_start = ff_ac3_bin_to_band_tab[start];
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band_end = ff_ac3_bin_to_band_tab[end-1] + 1;
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if (band_start == 0) {
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lowcomp = 0;
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lowcomp = calc_lowcomp1(lowcomp, band_psd[0], band_psd[1], 384);
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excite[0] = band_psd[0] - fast_gain - lowcomp;
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lowcomp = calc_lowcomp1(lowcomp, band_psd[1], band_psd[2], 384);
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excite[1] = band_psd[1] - fast_gain - lowcomp;
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begin = 7;
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for (band = 2; band < 7; band++) {
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if (!(is_lfe && band == 6))
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lowcomp = calc_lowcomp1(lowcomp, band_psd[band], band_psd[band+1], 384);
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fastleak = band_psd[band] - fast_gain;
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slowleak = band_psd[band] - s->slow_gain;
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excite[band] = fastleak - lowcomp;
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if (!(is_lfe && band == 6)) {
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if (band_psd[band] <= band_psd[band+1]) {
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begin = band + 1;
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break;
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}
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}
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}
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end1 = FFMIN(band_end, 22);
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for (band = begin; band < end1; band++) {
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if (!(is_lfe && band == 6))
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lowcomp = calc_lowcomp(lowcomp, band_psd[band], band_psd[band+1], band);
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fastleak = FFMAX(fastleak - s->fast_decay, band_psd[band] - fast_gain);
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slowleak = FFMAX(slowleak - s->slow_decay, band_psd[band] - s->slow_gain);
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excite[band] = FFMAX(fastleak - lowcomp, slowleak);
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}
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begin = 22;
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} else {
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/* coupling channel */
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begin = band_start;
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fastleak = (s->cpl_fast_leak << 8) + 768;
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slowleak = (s->cpl_slow_leak << 8) + 768;
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}
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for (band = begin; band < band_end; band++) {
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fastleak = FFMAX(fastleak - s->fast_decay, band_psd[band] - fast_gain);
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slowleak = FFMAX(slowleak - s->slow_decay, band_psd[band] - s->slow_gain);
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excite[band] = FFMAX(fastleak, slowleak);
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}
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/* compute masking curve */
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for (band = band_start; band < band_end; band++) {
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int tmp = s->db_per_bit - band_psd[band];
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if (tmp > 0) {
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excite[band] += tmp >> 2;
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}
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mask[band] = FFMAX(ac3_hearing_threshold_tab[band >> s->sr_shift][s->sr_code], excite[band]);
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}
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/* delta bit allocation */
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if (dba_mode == DBA_REUSE || dba_mode == DBA_NEW) {
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int i, seg, delta;
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if (dba_nsegs > 8)
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return -1;
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band = band_start;
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for (seg = 0; seg < dba_nsegs; seg++) {
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band += dba_offsets[seg];
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if (band >= AC3_CRITICAL_BANDS || dba_lengths[seg] > AC3_CRITICAL_BANDS-band)
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return -1;
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if (dba_values[seg] >= 4) {
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delta = (dba_values[seg] - 3) * 128;
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} else {
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delta = (dba_values[seg] - 4) * 128;
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}
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for (i = 0; i < dba_lengths[seg]; i++) {
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mask[band++] += delta;
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}
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}
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}
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return 0;
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}
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