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  1. /*
  2.  * MQ-coder encoder and decoder common functions
  3.  * Copyright (c) 2007 Kamil Nowosad
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * MQ-coder common (decoder/encoder) functions
  24.  * @file
  25.  * @author Kamil Nowosad
  26.  */
  27.  
  28. #include <string.h>
  29. #include <stdint.h>
  30.  
  31. #include "mqc.h"
  32.  
  33. /* MQ coder context state structure */
  34. typedef struct MqcCxState {
  35.     uint16_t qe;
  36.     uint8_t  nmps;
  37.     uint8_t  nlps;
  38.     uint8_t  sw;
  39. } MqcCxState;
  40.  
  41. static const MqcCxState cx_states[47] = {
  42.     { 0x5601,  1,  1, 1 },
  43.     { 0x3401,  2,  6, 0 },
  44.     { 0x1801,  3,  9, 0 },
  45.     { 0x0AC1,  4, 12, 0 },
  46.     { 0x0521,  5, 29, 0 },
  47.     { 0x0221, 38, 33, 0 },
  48.     { 0x5601,  7,  6, 1 },
  49.     { 0x5401,  8, 14, 0 },
  50.     { 0x4801,  9, 14, 0 },
  51.     { 0x3801, 10, 14, 0 },
  52.     { 0x3001, 11, 17, 0 },
  53.     { 0x2401, 12, 18, 0 },
  54.     { 0x1C01, 13, 20, 0 },
  55.     { 0x1601, 29, 21, 0 },
  56.     { 0x5601, 15, 14, 1 },
  57.     { 0x5401, 16, 14, 0 },
  58.     { 0x5101, 17, 15, 0 },
  59.     { 0x4801, 18, 16, 0 },
  60.     { 0x3801, 19, 17, 0 },
  61.     { 0x3401, 20, 18, 0 },
  62.     { 0x3001, 21, 19, 0 },
  63.     { 0x2801, 22, 19, 0 },
  64.     { 0x2401, 23, 20, 0 },
  65.     { 0x2201, 24, 21, 0 },
  66.     { 0x1C01, 25, 22, 0 },
  67.     { 0x1801, 26, 23, 0 },
  68.     { 0x1601, 27, 24, 0 },
  69.     { 0x1401, 28, 25, 0 },
  70.     { 0x1201, 29, 26, 0 },
  71.     { 0x1101, 30, 27, 0 },
  72.     { 0x0AC1, 31, 28, 0 },
  73.     { 0x09C1, 32, 29, 0 },
  74.     { 0x08A1, 33, 30, 0 },
  75.     { 0x0521, 34, 31, 0 },
  76.     { 0x0441, 35, 32, 0 },
  77.     { 0x02A1, 36, 33, 0 },
  78.     { 0x0221, 37, 34, 0 },
  79.     { 0x0141, 38, 35, 0 },
  80.     { 0x0111, 39, 36, 0 },
  81.     { 0x0085, 40, 37, 0 },
  82.     { 0x0049, 41, 38, 0 },
  83.     { 0x0025, 42, 39, 0 },
  84.     { 0x0015, 43, 40, 0 },
  85.     { 0x0009, 44, 41, 0 },
  86.     { 0x0005, 45, 42, 0 },
  87.     { 0x0001, 45, 43, 0 },
  88.     { 0x5601, 46, 46, 0 }
  89. };
  90.  
  91. uint16_t ff_mqc_qe [2 * 47];
  92. uint8_t ff_mqc_nlps[2 * 47];
  93. uint8_t ff_mqc_nmps[2 * 47];
  94.  
  95. void ff_mqc_init_context_tables(void)
  96. {
  97.     int i;
  98.     for (i = 0; i < 47; i++) {
  99.         ff_mqc_qe[2 * i]     =
  100.         ff_mqc_qe[2 * i + 1] = cx_states[i].qe;
  101.  
  102.         ff_mqc_nlps[2 * i]     = 2 * cx_states[i].nlps + cx_states[i].sw;
  103.         ff_mqc_nlps[2 * i + 1] = 2 * cx_states[i].nlps + 1 - cx_states[i].sw;
  104.         ff_mqc_nmps[2 * i]     = 2 * cx_states[i].nmps;
  105.         ff_mqc_nmps[2 * i + 1] = 2 * cx_states[i].nmps + 1;
  106.     }
  107. }
  108.  
  109. void ff_mqc_init_contexts(MqcState *mqc)
  110. {
  111.     memset(mqc->cx_states, 0, sizeof(mqc->cx_states));
  112.     mqc->cx_states[MQC_CX_UNI] = 2 * 46;
  113.     mqc->cx_states[MQC_CX_RL]  = 2 * 3;
  114.     mqc->cx_states[0]          = 2 * 4;
  115. }
  116.