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6148 | serge | 1 | /* |
2 | * MQ-coder encoder and decoder common functions |
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3 | * Copyright (c) 2007 Kamil Nowosad |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | /** |
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23 | * MQ-coder common (decoder/encoder) functions |
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24 | * @file |
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25 | * @author Kamil Nowosad |
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26 | */ |
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27 | |||
28 | #include |
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29 | #include |
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30 | |||
31 | #include "mqc.h" |
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32 | |||
33 | /* MQ coder context state structure */ |
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34 | typedef struct MqcCxState { |
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35 | uint16_t qe; |
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36 | uint8_t nmps; |
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37 | uint8_t nlps; |
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38 | uint8_t sw; |
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39 | } MqcCxState; |
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40 | |||
41 | static const MqcCxState cx_states[47] = { |
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42 | { 0x5601, 1, 1, 1 }, |
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43 | { 0x3401, 2, 6, 0 }, |
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44 | { 0x1801, 3, 9, 0 }, |
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45 | { 0x0AC1, 4, 12, 0 }, |
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46 | { 0x0521, 5, 29, 0 }, |
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47 | { 0x0221, 38, 33, 0 }, |
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48 | { 0x5601, 7, 6, 1 }, |
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49 | { 0x5401, 8, 14, 0 }, |
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50 | { 0x4801, 9, 14, 0 }, |
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51 | { 0x3801, 10, 14, 0 }, |
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52 | { 0x3001, 11, 17, 0 }, |
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53 | { 0x2401, 12, 18, 0 }, |
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54 | { 0x1C01, 13, 20, 0 }, |
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55 | { 0x1601, 29, 21, 0 }, |
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56 | { 0x5601, 15, 14, 1 }, |
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57 | { 0x5401, 16, 14, 0 }, |
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58 | { 0x5101, 17, 15, 0 }, |
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59 | { 0x4801, 18, 16, 0 }, |
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60 | { 0x3801, 19, 17, 0 }, |
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61 | { 0x3401, 20, 18, 0 }, |
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62 | { 0x3001, 21, 19, 0 }, |
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63 | { 0x2801, 22, 19, 0 }, |
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64 | { 0x2401, 23, 20, 0 }, |
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65 | { 0x2201, 24, 21, 0 }, |
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66 | { 0x1C01, 25, 22, 0 }, |
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67 | { 0x1801, 26, 23, 0 }, |
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68 | { 0x1601, 27, 24, 0 }, |
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69 | { 0x1401, 28, 25, 0 }, |
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70 | { 0x1201, 29, 26, 0 }, |
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71 | { 0x1101, 30, 27, 0 }, |
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72 | { 0x0AC1, 31, 28, 0 }, |
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73 | { 0x09C1, 32, 29, 0 }, |
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74 | { 0x08A1, 33, 30, 0 }, |
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75 | { 0x0521, 34, 31, 0 }, |
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76 | { 0x0441, 35, 32, 0 }, |
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77 | { 0x02A1, 36, 33, 0 }, |
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78 | { 0x0221, 37, 34, 0 }, |
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79 | { 0x0141, 38, 35, 0 }, |
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80 | { 0x0111, 39, 36, 0 }, |
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81 | { 0x0085, 40, 37, 0 }, |
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82 | { 0x0049, 41, 38, 0 }, |
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83 | { 0x0025, 42, 39, 0 }, |
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84 | { 0x0015, 43, 40, 0 }, |
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85 | { 0x0009, 44, 41, 0 }, |
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86 | { 0x0005, 45, 42, 0 }, |
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87 | { 0x0001, 45, 43, 0 }, |
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88 | { 0x5601, 46, 46, 0 } |
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89 | }; |
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90 | |||
91 | uint16_t ff_mqc_qe [2 * 47]; |
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92 | uint8_t ff_mqc_nlps[2 * 47]; |
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93 | uint8_t ff_mqc_nmps[2 * 47]; |
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94 | |||
95 | void ff_mqc_init_context_tables(void) |
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96 | { |
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97 | int i; |
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98 | for (i = 0; i < 47; i++) { |
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99 | ff_mqc_qe[2 * i] = |
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100 | ff_mqc_qe[2 * i + 1] = cx_states[i].qe; |
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101 | |||
102 | ff_mqc_nlps[2 * i] = 2 * cx_states[i].nlps + cx_states[i].sw; |
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103 | ff_mqc_nlps[2 * i + 1] = 2 * cx_states[i].nlps + 1 - cx_states[i].sw; |
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104 | ff_mqc_nmps[2 * i] = 2 * cx_states[i].nmps; |
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105 | ff_mqc_nmps[2 * i + 1] = 2 * cx_states[i].nmps + 1; |
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106 | } |
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107 | } |
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108 | |||
109 | void ff_mqc_init_contexts(MqcState *mqc) |
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110 | { |
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111 | memset(mqc->cx_states, 0, sizeof(mqc->cx_states)); |
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112 | mqc->cx_states[MQC_CX_UNI] = 2 * 46; |
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113 | mqc->cx_states[MQC_CX_RL] = 2 * 3; |
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114 | mqc->cx_states[0] = 2 * 4; |
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115 | }> |