| 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 "libavutil/attributes.h" |
| 32 | |
| 33 | #include "mqc.h" |
| 34 | |
| 35 | /* MQ coder context state structure */ |
| 36 | typedef struct MqcCxState { |
| 37 | uint16_t qe; |
| 38 | uint8_t nmps; |
| 39 | uint8_t nlps; |
| 40 | uint8_t sw; |
| 41 | } MqcCxState; |
| 42 | |
| 43 | static const MqcCxState cx_states[47] = { |
| 44 | { 0x5601, 1, 1, 1 }, |
| 45 | { 0x3401, 2, 6, 0 }, |
| 46 | { 0x1801, 3, 9, 0 }, |
| 47 | { 0x0AC1, 4, 12, 0 }, |
| 48 | { 0x0521, 5, 29, 0 }, |
| 49 | { 0x0221, 38, 33, 0 }, |
| 50 | { 0x5601, 7, 6, 1 }, |
| 51 | { 0x5401, 8, 14, 0 }, |
| 52 | { 0x4801, 9, 14, 0 }, |
| 53 | { 0x3801, 10, 14, 0 }, |
| 54 | { 0x3001, 11, 17, 0 }, |
| 55 | { 0x2401, 12, 18, 0 }, |
| 56 | { 0x1C01, 13, 20, 0 }, |
| 57 | { 0x1601, 29, 21, 0 }, |
| 58 | { 0x5601, 15, 14, 1 }, |
| 59 | { 0x5401, 16, 14, 0 }, |
| 60 | { 0x5101, 17, 15, 0 }, |
| 61 | { 0x4801, 18, 16, 0 }, |
| 62 | { 0x3801, 19, 17, 0 }, |
| 63 | { 0x3401, 20, 18, 0 }, |
| 64 | { 0x3001, 21, 19, 0 }, |
| 65 | { 0x2801, 22, 19, 0 }, |
| 66 | { 0x2401, 23, 20, 0 }, |
| 67 | { 0x2201, 24, 21, 0 }, |
| 68 | { 0x1C01, 25, 22, 0 }, |
| 69 | { 0x1801, 26, 23, 0 }, |
| 70 | { 0x1601, 27, 24, 0 }, |
| 71 | { 0x1401, 28, 25, 0 }, |
| 72 | { 0x1201, 29, 26, 0 }, |
| 73 | { 0x1101, 30, 27, 0 }, |
| 74 | { 0x0AC1, 31, 28, 0 }, |
| 75 | { 0x09C1, 32, 29, 0 }, |
| 76 | { 0x08A1, 33, 30, 0 }, |
| 77 | { 0x0521, 34, 31, 0 }, |
| 78 | { 0x0441, 35, 32, 0 }, |
| 79 | { 0x02A1, 36, 33, 0 }, |
| 80 | { 0x0221, 37, 34, 0 }, |
| 81 | { 0x0141, 38, 35, 0 }, |
| 82 | { 0x0111, 39, 36, 0 }, |
| 83 | { 0x0085, 40, 37, 0 }, |
| 84 | { 0x0049, 41, 38, 0 }, |
| 85 | { 0x0025, 42, 39, 0 }, |
| 86 | { 0x0015, 43, 40, 0 }, |
| 87 | { 0x0009, 44, 41, 0 }, |
| 88 | { 0x0005, 45, 42, 0 }, |
| 89 | { 0x0001, 45, 43, 0 }, |
| 90 | { 0x5601, 46, 46, 0 } |
| 91 | }; |
| 92 | |
| 93 | uint16_t ff_mqc_qe [2 * 47]; |
| 94 | uint8_t ff_mqc_nlps[2 * 47]; |
| 95 | uint8_t ff_mqc_nmps[2 * 47]; |
| 96 | |
| 97 | void av_cold ff_mqc_init_context_tables(void) |
| 98 | { |
| 99 | int i; |
| 100 | for (i = 0; i < 47; i++) { |
| 101 | ff_mqc_qe[2 * i] = |
| 102 | ff_mqc_qe[2 * i + 1] = cx_states[i].qe; |
| 103 | |
| 104 | ff_mqc_nlps[2 * i] = 2 * cx_states[i].nlps + cx_states[i].sw; |
| 105 | ff_mqc_nlps[2 * i + 1] = 2 * cx_states[i].nlps + 1 - cx_states[i].sw; |
| 106 | ff_mqc_nmps[2 * i] = 2 * cx_states[i].nmps; |
| 107 | ff_mqc_nmps[2 * i + 1] = 2 * cx_states[i].nmps + 1; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | void ff_mqc_init_contexts(MqcState *mqc) |
| 112 | { |
| 113 | memset(mqc->cx_states, 0, sizeof(mqc->cx_states)); |
| 114 | mqc->cx_states[MQC_CX_UNI] = 2 * 46; |
| 115 | mqc->cx_states[MQC_CX_RL] = 2 * 3; |
| 116 | mqc->cx_states[0] = 2 * 4; |
| 117 | } |