FFmpeg/libavcodec/dvquant.h

/*
 * Quant and Weight for DV codec
 * Copyright (c) 2002 Fabrice Bellard
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * Constants for DV codec.
 */

#ifndef AVCODEC_DVQUANT_H
#define AVCODEC_DVQUANT_H

#include <stdint.h>

/* unquant tables (not used directly) */
static const uint8_t dv_quant_shifts[22][4] = {
  { 3,3,4,4 },
  { 3,3,4,4 },
  { 2,3,3,4 },
  { 2,3,3,4 },
  { 2,2,3,3 },
  { 2,2,3,3 },
  { 1,2,2,3 },
  { 1,2,2,3 },
  { 1,1,2,2 },
  { 1,1,2,2 },
  { 0,1,1,2 },
  { 0,1,1,2 },
  { 0,0,1,1 },
  { 0,0,1,1 },
  { 0,0,0,1 },
  { 0,0,0,0 },
  { 0,0,0,0 },
  { 0,0,0,0 },
  { 0,0,0,0 },
  { 0,0,0,0 },
  { 0,0,0,0 },
  { 0,0,0,0 },
};

static const uint8_t dv_quant_offset[4] = { 6,  3,  0,  1 };
static const uint8_t dv_quant_areas[4]  = { 6, 21, 43, 64 };

/* quantization quanta by QNO for DV100 */
static const uint8_t dv100_qstep[16] = {
    1, /* QNO = 0 and 1 both have no quantization */
    1,
    2, 3, 4, 5, 6, 7, 8, 16, 18, 20, 22, 24, 28, 52
};

/* DV25/50 DCT coefficient weights and inverse weights */
/* created by dvtables.py */
static const int dv_weight_bits = 18;
static const int dv_weight_88[64] = {
 131072, 257107, 257107, 242189, 252167, 242189, 235923, 237536,
 237536, 235923, 229376, 231390, 223754, 231390, 229376, 222935,
 224969, 217965, 217965, 224969, 222935, 200636, 218652, 211916,
 212325, 211916, 218652, 200636, 188995, 196781, 205965, 206433,
 206433, 205965, 196781, 188995, 185364, 185364, 200636, 200704,
 200636, 185364, 185364, 174609, 180568, 195068, 195068, 180568,
 174609, 170091, 175557, 189591, 175557, 170091, 165371, 170627,
 170627, 165371, 160727, 153560, 160727, 144651, 144651, 136258,
};
static const int dv_weight_248[64] = {
 131072, 242189, 257107, 237536, 229376, 200636, 242189, 223754,
 224969, 196781, 262144, 242189, 229376, 200636, 257107, 237536,
 211916, 185364, 235923, 217965, 229376, 211916, 206433, 180568,
 242189, 223754, 224969, 196781, 211916, 185364, 235923, 217965,
 200704, 175557, 222935, 205965, 200636, 185364, 195068, 170627,
 229376, 211916, 206433, 180568, 200704, 175557, 222935, 205965,
 175557, 153560, 188995, 174609, 165371, 144651, 200636, 185364,
 195068, 170627, 175557, 153560, 188995, 174609, 165371, 144651,
};
static const int dv_iweight_bits = 14;
static const int dv_iweight_88[64] = {
 32768, 16710, 16710, 17735, 17015, 17735, 18197, 18079,
 18079, 18197, 18725, 18559, 19196, 18559, 18725, 19284,
 19108, 19692, 19692, 19108, 19284, 21400, 19645, 20262,
 20214, 20262, 19645, 21400, 22733, 21845, 20867, 20815,
 20815, 20867, 21845, 22733, 23173, 23173, 21400, 21400,
 21400, 23173, 23173, 24600, 23764, 22017, 22017, 23764,
 24600, 25267, 24457, 22672, 24457, 25267, 25971, 25191,
 25191, 25971, 26715, 27962, 26715, 29642, 29642, 31536,
};
static const int dv_iweight_248[64] = {
 32768, 17735, 16710, 18079, 18725, 21400, 17735, 19196,
 19108, 21845, 16384, 17735, 18725, 21400, 16710, 18079,
 20262, 23173, 18197, 19692, 18725, 20262, 20815, 23764,
 17735, 19196, 19108, 21845, 20262, 23173, 18197, 19692,
 21400, 24457, 19284, 20867, 21400, 23173, 22017, 25191,
 18725, 20262, 20815, 23764, 21400, 24457, 19284, 20867,
 24457, 27962, 22733, 24600, 25971, 29642, 21400, 23173,
 22017, 25191, 24457, 27962, 22733, 24600, 25971, 29642,
};

/**
 * The "inverse" DV100 weights are actually just the spec weights (zig-zagged).
 */
static const int dv_iweight_1080_y[64] = {
    128,  16,  16,  17,  17,  17,  18,  18,
     18,  18,  18,  18,  19,  18,  18,  19,
     19,  19,  19,  19,  19,  42,  38,  40,
     40,  40,  38,  42,  44,  43,  41,  41,
     41,  41,  43,  44,  45,  45,  42,  42,
     42,  45,  45,  48,  46,  43,  43,  46,
     48,  49,  48,  44,  48,  49, 101,  98,
     98, 101, 104, 109, 104, 116, 116, 123,
};
static const int dv_iweight_1080_c[64] = {
    128,  16,  16,  17,  17,  17,  25,  25,
     25,  25,  26,  25,  26,  25,  26,  26,
     26,  27,  27,  26,  26,  42,  38,  40,
     40,  40,  38,  42,  44,  43,  41,  41,
     41,  41,  43,  44,  91,  91,  84,  84,
     84,  91,  91,  96,  93,  86,  86,  93,
     96, 197, 191, 177, 191, 197, 203, 197,
    197, 203, 209, 219, 209, 232, 232, 246,
};
static const int dv_iweight_720_y[64] = {
    128,  16,  16,  17,  17,  17,  18,  18,
     18,  18,  18,  18,  19,  18,  18,  19,
     19,  19,  19,  19,  19,  42,  38,  40,
     40,  40,  38,  42,  44,  43,  41,  41,
     41,  41,  43,  44,  68,  68,  63,  63,
     63,  68,  68,  96,  92,  86,  86,  92,
     96,  98,  96,  88,  96,  98, 202, 196,
    196, 202, 208, 218, 208, 232, 232, 246,
};
static const int dv_iweight_720_c[64] = {
    128,  24,  24,  26,  26,  26,  36,  36,
     36,  36,  36,  36,  38,  36,  36,  38,
     38,  38,  38,  38,  38,  84,  76,  80,
     80,  80,  76,  84,  88,  86,  82,  82,
     82,  82,  86,  88, 182, 182, 168, 168,
    168, 182, 182, 192, 186, 192, 172, 186,
    192, 394, 382, 354, 382, 394, 406, 394,
    394, 406, 418, 438, 418, 464, 464, 492,
};

#endif /* AVCODEC_DVQUANT_H */