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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Microsoft Screen 4 (aka Microsoft Expression Encoder Screen) decoder |
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| 3 | * Copyright (c) 2012 Konstantin Shishkov |
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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 | * @file |
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| 24 | * Microsoft Screen 4 (aka Microsoft Titanium Screen 2, |
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| 25 | * aka Microsoft Expression Encoder Screen) decoder |
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| 26 | */ |
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| 27 | |||
| 28 | #include "avcodec.h" |
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| 29 | #include "bytestream.h" |
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| 30 | #include "dsputil.h" |
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| 31 | #include "get_bits.h" |
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| 32 | #include "internal.h" |
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| 33 | #include "mss34dsp.h" |
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| 34 | #include "unary.h" |
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| 35 | |||
| 36 | #define HEADER_SIZE 8 |
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| 37 | |||
| 38 | enum FrameType { |
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| 39 | INTRA_FRAME = 0, |
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| 40 | INTER_FRAME, |
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| 41 | SKIP_FRAME |
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| 42 | }; |
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| 43 | |||
| 44 | enum BlockType { |
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| 45 | SKIP_BLOCK = 0, |
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| 46 | DCT_BLOCK, |
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| 47 | IMAGE_BLOCK, |
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| 48 | }; |
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| 49 | |||
| 50 | enum CachePos { |
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| 51 | LEFT = 0, |
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| 52 | TOP_LEFT, |
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| 53 | TOP, |
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| 54 | }; |
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| 55 | |||
| 56 | static const uint8_t mss4_dc_vlc_lens[2][16] = { |
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| 57 | { 0, 1, 5, 1, 1, 1, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0 }, |
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| 58 | { 0, 3, 1, 1, 1, 1, 1, 1, 1, 2, 0, 0, 0, 0, 0, 0 } |
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| 59 | }; |
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| 60 | |||
| 61 | static const uint8_t mss4_ac_vlc_lens[2][16] = { |
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| 62 | { 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 125 }, |
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| 63 | { 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 119 } |
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| 64 | }; |
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| 65 | |||
| 66 | static const uint8_t mss4_ac_vlc_syms[2][162] = { |
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| 67 | { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, |
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| 68 | 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, |
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| 69 | 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xA1, 0x08, |
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| 70 | 0x23, 0x42, 0xB1, 0xC1, 0x15, 0x52, 0xD1, 0xF0, |
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| 71 | 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0A, 0x16, |
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| 72 | 0x17, 0x18, 0x19, 0x1A, 0x25, 0x26, 0x27, 0x28, |
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| 73 | 0x29, 0x2A, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, |
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| 74 | 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, |
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| 75 | 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, |
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| 76 | 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, |
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| 77 | 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, |
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| 78 | 0x7A, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, |
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| 79 | 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, |
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| 80 | 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, |
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| 81 | 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, |
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| 82 | 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5, |
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| 83 | 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4, |
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| 84 | 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE1, 0xE2, |
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| 85 | 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, |
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| 86 | 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, |
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| 87 | 0xF9, 0xFA }, |
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| 88 | { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, |
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| 89 | 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, |
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| 90 | 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, |
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| 91 | 0xA1, 0xB1, 0xC1, 0x09, 0x23, 0x33, 0x52, 0xF0, |
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| 92 | 0x15, 0x62, 0x72, 0xD1, 0x0A, 0x16, 0x24, 0x34, |
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| 93 | 0xE1, 0x25, 0xF1, 0x17, 0x18, 0x19, 0x1A, 0x26, |
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| 94 | 0x27, 0x28, 0x29, 0x2A, 0x35, 0x36, 0x37, 0x38, |
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| 95 | 0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, |
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| 96 | 0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, |
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| 97 | 0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, |
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| 98 | 0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, |
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| 99 | 0x79, 0x7A, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, |
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| 100 | 0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, |
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| 101 | 0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, |
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| 102 | 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, |
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| 103 | 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, |
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| 104 | 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, |
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| 105 | 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, |
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| 106 | 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, |
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| 107 | 0xEA, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, |
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| 108 | 0xF9, 0xFA } |
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| 109 | }; |
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| 110 | |||
| 111 | static const uint8_t vec_len_syms[2][4] = { |
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| 112 | { 4, 2, 3, 1 }, |
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| 113 | { 4, 1, 2, 3 } |
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| 114 | }; |
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| 115 | |||
| 116 | static const uint8_t mss4_vec_entry_vlc_lens[2][16] = { |
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| 117 | { 0, 2, 2, 3, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
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| 118 | { 0, 1, 5, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } |
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| 119 | }; |
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| 120 | |||
| 121 | static const uint8_t mss4_vec_entry_vlc_syms[2][9] = { |
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| 122 | { 0, 7, 6, 5, 8, 4, 3, 1, 2 }, |
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| 123 | { 0, 2, 3, 4, 5, 6, 7, 1, 8 } |
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| 124 | }; |
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| 125 | |||
| 126 | #define MAX_ENTRIES 162 |
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| 127 | |||
| 128 | typedef struct MSS4Context { |
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| 129 | AVFrame *pic; |
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| 130 | |||
| 131 | VLC dc_vlc[2], ac_vlc[2]; |
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| 132 | VLC vec_entry_vlc[2]; |
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| 133 | int block[64]; |
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| 134 | uint8_t imgbuf[3][16 * 16]; |
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| 135 | |||
| 136 | int quality; |
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| 137 | uint16_t quant_mat[2][64]; |
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| 138 | |||
| 139 | int *prev_dc[3]; |
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| 140 | int dc_stride[3]; |
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| 141 | int dc_cache[4][4]; |
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| 142 | |||
| 143 | int prev_vec[3][4]; |
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| 144 | } MSS4Context; |
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| 145 | |||
| 146 | static av_cold int mss4_init_vlc(VLC *vlc, const uint8_t *lens, |
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| 147 | const uint8_t *syms, int num_syms) |
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| 148 | { |
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| 149 | uint8_t bits[MAX_ENTRIES]; |
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| 150 | uint16_t codes[MAX_ENTRIES]; |
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| 151 | int i, j; |
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| 152 | int prefix = 0, max_bits = 0, idx = 0; |
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| 153 | |||
| 154 | for (i = 0; i < 16; i++) { |
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| 155 | for (j = 0; j < lens[i]; j++) { |
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| 156 | bits[idx] = i + 1; |
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| 157 | codes[idx] = prefix++; |
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| 158 | max_bits = i + 1; |
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| 159 | idx++; |
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| 160 | } |
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| 161 | prefix <<= 1; |
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| 162 | } |
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| 163 | |||
| 164 | return ff_init_vlc_sparse(vlc, FFMIN(max_bits, 9), num_syms, bits, 1, 1, |
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| 165 | codes, 2, 2, syms, 1, 1, 0); |
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| 166 | } |
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| 167 | |||
| 168 | static av_cold int mss4_init_vlcs(MSS4Context *ctx) |
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| 169 | { |
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| 170 | int ret, i; |
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| 171 | |||
| 172 | for (i = 0; i < 2; i++) { |
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| 173 | ret = mss4_init_vlc(&ctx->dc_vlc[i], mss4_dc_vlc_lens[i], NULL, 12); |
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| 174 | if (ret) |
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| 175 | return ret; |
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| 176 | ret = mss4_init_vlc(&ctx->ac_vlc[i], mss4_ac_vlc_lens[i], |
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| 177 | mss4_ac_vlc_syms[i], 162); |
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| 178 | if (ret) |
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| 179 | return ret; |
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| 180 | ret = mss4_init_vlc(&ctx->vec_entry_vlc[i], mss4_vec_entry_vlc_lens[i], |
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| 181 | mss4_vec_entry_vlc_syms[i], 9); |
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| 182 | if (ret) |
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| 183 | return ret; |
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| 184 | } |
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| 185 | return 0; |
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| 186 | } |
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| 187 | |||
| 188 | static av_cold void mss4_free_vlcs(MSS4Context *ctx) |
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| 189 | { |
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| 190 | int i; |
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| 191 | |||
| 192 | for (i = 0; i < 2; i++) { |
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| 193 | ff_free_vlc(&ctx->dc_vlc[i]); |
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| 194 | ff_free_vlc(&ctx->ac_vlc[i]); |
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| 195 | ff_free_vlc(&ctx->vec_entry_vlc[i]); |
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| 196 | } |
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| 197 | } |
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| 198 | |||
| 199 | /* This function returns values in the range |
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| 200 | * (-range + 1; -range/2] U [range/2; range - 1) |
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| 201 | * i.e. |
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| 202 | * nbits = 0 -> 0 |
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| 203 | * nbits = 1 -> -1, 1 |
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| 204 | * nbits = 2 -> -3, -2, 2, 3 |
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| 205 | */ |
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| 206 | static av_always_inline int get_coeff_bits(GetBitContext *gb, int nbits) |
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| 207 | { |
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| 208 | int val; |
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| 209 | |||
| 210 | if (!nbits) |
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| 211 | return 0; |
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| 212 | |||
| 213 | val = get_bits(gb, nbits); |
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| 214 | if (val < (1 << (nbits - 1))) |
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| 215 | val -= (1 << nbits) - 1; |
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| 216 | |||
| 217 | return val; |
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| 218 | } |
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| 219 | |||
| 220 | static inline int get_coeff(GetBitContext *gb, VLC *vlc) |
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| 221 | { |
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| 222 | int val = get_vlc2(gb, vlc->table, vlc->bits, 2); |
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| 223 | |||
| 224 | return get_coeff_bits(gb, val); |
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| 225 | } |
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| 226 | |||
| 227 | static int mss4_decode_dct(GetBitContext *gb, VLC *dc_vlc, VLC *ac_vlc, |
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| 228 | int *block, int *dc_cache, |
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| 229 | int bx, int by, uint16_t *quant_mat) |
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| 230 | { |
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| 231 | int skip, val, pos = 1, zz_pos, dc; |
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| 232 | |||
| 233 | memset(block, 0, sizeof(*block) * 64); |
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| 234 | |||
| 235 | dc = get_coeff(gb, dc_vlc); |
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| 236 | // DC prediction is the same as in MSS3 |
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| 237 | if (by) { |
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| 238 | if (bx) { |
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| 239 | int l, tl, t; |
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| 240 | |||
| 241 | l = dc_cache[LEFT]; |
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| 242 | tl = dc_cache[TOP_LEFT]; |
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| 243 | t = dc_cache[TOP]; |
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| 244 | |||
| 245 | if (FFABS(t - tl) <= FFABS(l - tl)) |
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| 246 | dc += l; |
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| 247 | else |
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| 248 | dc += t; |
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| 249 | } else { |
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| 250 | dc += dc_cache[TOP]; |
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| 251 | } |
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| 252 | } else if (bx) { |
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| 253 | dc += dc_cache[LEFT]; |
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| 254 | } |
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| 255 | dc_cache[LEFT] = dc; |
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| 256 | block[0] = dc * quant_mat[0]; |
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| 257 | |||
| 258 | while (pos < 64) { |
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| 259 | val = get_vlc2(gb, ac_vlc->table, 9, 2); |
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| 260 | if (!val) |
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| 261 | return 0; |
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| 262 | if (val == -1) |
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| 263 | return -1; |
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| 264 | if (val == 0xF0) { |
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| 265 | pos += 16; |
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| 266 | continue; |
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| 267 | } |
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| 268 | skip = val >> 4; |
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| 269 | val = get_coeff_bits(gb, val & 0xF); |
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| 270 | pos += skip; |
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| 271 | if (pos >= 64) |
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| 272 | return -1; |
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| 273 | |||
| 274 | zz_pos = ff_zigzag_direct[pos]; |
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| 275 | block[zz_pos] = val * quant_mat[zz_pos]; |
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| 276 | pos++; |
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| 277 | } |
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| 278 | |||
| 279 | return pos == 64 ? 0 : -1; |
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| 280 | } |
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| 281 | |||
| 282 | static int mss4_decode_dct_block(MSS4Context *c, GetBitContext *gb, |
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| 283 | uint8_t *dst[3], int mb_x, int mb_y) |
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| 284 | { |
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| 285 | int i, j, k, ret; |
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| 286 | uint8_t *out = dst[0]; |
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| 287 | |||
| 288 | for (j = 0; j < 2; j++) { |
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| 289 | for (i = 0; i < 2; i++) { |
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| 290 | int xpos = mb_x * 2 + i; |
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| 291 | c->dc_cache[j][TOP_LEFT] = c->dc_cache[j][TOP]; |
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| 292 | c->dc_cache[j][TOP] = c->prev_dc[0][mb_x * 2 + i]; |
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| 293 | ret = mss4_decode_dct(gb, c->dc_vlc, c->ac_vlc, c->block, |
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| 294 | c->dc_cache[j], |
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| 295 | xpos, mb_y * 2 + j, c->quant_mat[0]); |
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| 296 | if (ret) |
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| 297 | return ret; |
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| 298 | c->prev_dc[0][mb_x * 2 + i] = c->dc_cache[j][LEFT]; |
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| 299 | |||
| 300 | ff_mss34_dct_put(out + xpos * 8, c->pic->linesize[0], |
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| 301 | c->block); |
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| 302 | } |
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| 303 | out += 8 * c->pic->linesize[0]; |
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| 304 | } |
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| 305 | |||
| 306 | for (i = 1; i < 3; i++) { |
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| 307 | c->dc_cache[i + 1][TOP_LEFT] = c->dc_cache[i + 1][TOP]; |
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| 308 | c->dc_cache[i + 1][TOP] = c->prev_dc[i][mb_x]; |
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| 309 | ret = mss4_decode_dct(gb, c->dc_vlc + 1, c->ac_vlc + 1, |
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| 310 | c->block, c->dc_cache[i + 1], mb_x, mb_y, |
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| 311 | c->quant_mat[1]); |
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| 312 | if (ret) |
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| 313 | return ret; |
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| 314 | c->prev_dc[i][mb_x] = c->dc_cache[i + 1][LEFT]; |
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| 315 | |||
| 316 | ff_mss34_dct_put(c->imgbuf[i], 8, c->block); |
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| 317 | out = dst[i] + mb_x * 16; |
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| 318 | // Since the DCT block is coded as YUV420 and the whole frame as YUV444, |
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| 319 | // we need to scale chroma. |
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| 320 | for (j = 0; j < 16; j++) { |
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| 321 | for (k = 0; k < 8; k++) |
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| 322 | AV_WN16A(out + k * 2, c->imgbuf[i][k + (j & ~1) * 4] * 0x101); |
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| 323 | out += c->pic->linesize[i]; |
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| 324 | } |
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| 325 | } |
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| 326 | |||
| 327 | return 0; |
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| 328 | } |
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| 329 | |||
| 330 | static void read_vec_pos(GetBitContext *gb, int *vec_pos, int *sel_flag, |
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| 331 | int *sel_len, int *prev) |
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| 332 | { |
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| 333 | int i, y_flag = 0; |
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| 334 | |||
| 335 | for (i = 2; i >= 0; i--) { |
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| 336 | if (!sel_flag[i]) { |
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| 337 | vec_pos[i] = 0; |
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| 338 | continue; |
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| 339 | } |
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| 340 | if ((!i && !y_flag) || get_bits1(gb)) { |
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| 341 | if (sel_len[i] > 0) { |
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| 342 | int pval = prev[i]; |
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| 343 | vec_pos[i] = get_bits(gb, sel_len[i]); |
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| 344 | if (vec_pos[i] >= pval) |
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| 345 | vec_pos[i]++; |
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| 346 | } else { |
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| 347 | vec_pos[i] = !prev[i]; |
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| 348 | } |
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| 349 | y_flag = 1; |
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| 350 | } else { |
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| 351 | vec_pos[i] = prev[i]; |
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| 352 | } |
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| 353 | } |
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| 354 | } |
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| 355 | |||
| 356 | static int get_value_cached(GetBitContext *gb, int vec_pos, uint8_t *vec, |
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| 357 | int vec_size, int component, int shift, int *prev) |
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| 358 | { |
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| 359 | if (vec_pos < vec_size) |
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| 360 | return vec[vec_pos]; |
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| 361 | if (!get_bits1(gb)) |
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| 362 | return prev[component]; |
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| 363 | prev[component] = get_bits(gb, 8 - shift) << shift; |
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| 364 | return prev[component]; |
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| 365 | } |
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| 366 | |||
| 367 | #define MKVAL(vals) (vals[0] | (vals[1] << 3) | (vals[2] << 6)) |
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| 368 | |||
| 369 | /* Image mode - the hardest to comprehend MSS4 coding mode. |
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| 370 | * |
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| 371 | * In this mode all three 16x16 blocks are coded together with a method |
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| 372 | * remotely similar to the methods employed in MSS1-MSS3. |
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| 373 | * The idea is that every component has a vector of 1-4 most common symbols |
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| 374 | * and an escape mode for reading new value from the bitstream. Decoding |
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| 375 | * consists of retrieving pixel values from the vector or reading new ones |
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| 376 | * from the bitstream; depending on flags read from the bitstream, these vector |
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| 377 | * positions can be updated or reused from the state of the previous line |
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| 378 | * or previous pixel. |
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| 379 | */ |
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| 380 | static int mss4_decode_image_block(MSS4Context *ctx, GetBitContext *gb, |
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| 381 | uint8_t *picdst[3], int mb_x, int mb_y) |
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| 382 | { |
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| 383 | uint8_t vec[3][4]; |
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| 384 | int vec_len[3]; |
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| 385 | int sel_len[3], sel_flag[3]; |
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| 386 | int i, j, k, mode, split; |
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| 387 | int prev_vec1 = 0, prev_split = 0; |
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| 388 | int vals[3] = { 0 }; |
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| 389 | int prev_pix[3] = { 0 }; |
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| 390 | int prev_mode[16] = { 0 }; |
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| 391 | uint8_t *dst[3]; |
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| 392 | |||
| 393 | const int val_shift = ctx->quality == 100 ? 0 : 2; |
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| 394 | |||
| 395 | for (i = 0; i < 3; i++) |
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| 396 | dst[i] = ctx->imgbuf[i]; |
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| 397 | |||
| 398 | for (i = 0; i < 3; i++) { |
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| 399 | vec_len[i] = vec_len_syms[!!i][get_unary(gb, 0, 3)]; |
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| 400 | for (j = 0; j < vec_len[i]; j++) { |
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| 401 | vec[i][j] = get_coeff(gb, &ctx->vec_entry_vlc[!!i]); |
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| 402 | vec[i][j] += ctx->prev_vec[i][j]; |
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| 403 | ctx->prev_vec[i][j] = vec[i][j]; |
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| 404 | } |
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| 405 | sel_flag[i] = vec_len[i] > 1; |
||
| 406 | sel_len[i] = vec_len[i] > 2 ? vec_len[i] - 2 : 0; |
||
| 407 | } |
||
| 408 | |||
| 409 | for (j = 0; j < 16; j++) { |
||
| 410 | if (get_bits1(gb)) { |
||
| 411 | split = 0; |
||
| 412 | if (get_bits1(gb)) { |
||
| 413 | prev_mode[0] = 0; |
||
| 414 | vals[0] = vals[1] = vals[2] = 0; |
||
| 415 | mode = 2; |
||
| 416 | } else { |
||
| 417 | mode = get_bits1(gb); |
||
| 418 | if (mode) |
||
| 419 | split = get_bits(gb, 4); |
||
| 420 | } |
||
| 421 | for (i = 0; i < 16; i++) { |
||
| 422 | if (mode <= 1) { |
||
| 423 | vals[0] = prev_mode[i] & 7; |
||
| 424 | vals[1] = (prev_mode[i] >> 3) & 7; |
||
| 425 | vals[2] = prev_mode[i] >> 6; |
||
| 426 | if (mode == 1 && i == split) { |
||
| 427 | read_vec_pos(gb, vals, sel_flag, sel_len, vals); |
||
| 428 | } |
||
| 429 | } else if (mode == 2) { |
||
| 430 | if (get_bits1(gb)) |
||
| 431 | read_vec_pos(gb, vals, sel_flag, sel_len, vals); |
||
| 432 | } |
||
| 433 | for (k = 0; k < 3; k++) |
||
| 434 | *dst[k]++ = get_value_cached(gb, vals[k], vec[k], |
||
| 435 | vec_len[k], k, |
||
| 436 | val_shift, prev_pix); |
||
| 437 | prev_mode[i] = MKVAL(vals); |
||
| 438 | } |
||
| 439 | } else { |
||
| 440 | if (get_bits1(gb)) { |
||
| 441 | split = get_bits(gb, 4); |
||
| 442 | if (split >= prev_split) |
||
| 443 | split++; |
||
| 444 | prev_split = split; |
||
| 445 | } else { |
||
| 446 | split = prev_split; |
||
| 447 | } |
||
| 448 | if (split) { |
||
| 449 | vals[0] = prev_mode[0] & 7; |
||
| 450 | vals[1] = (prev_mode[0] >> 3) & 7; |
||
| 451 | vals[2] = prev_mode[0] >> 6; |
||
| 452 | for (i = 0; i < 3; i++) { |
||
| 453 | for (k = 0; k < split; k++) { |
||
| 454 | *dst[i]++ = get_value_cached(gb, vals[i], vec[i], |
||
| 455 | vec_len[i], i, val_shift, |
||
| 456 | prev_pix); |
||
| 457 | prev_mode[k] = MKVAL(vals); |
||
| 458 | } |
||
| 459 | } |
||
| 460 | } |
||
| 461 | |||
| 462 | if (split != 16) { |
||
| 463 | vals[0] = prev_vec1 & 7; |
||
| 464 | vals[1] = (prev_vec1 >> 3) & 7; |
||
| 465 | vals[2] = prev_vec1 >> 6; |
||
| 466 | if (get_bits1(gb)) { |
||
| 467 | read_vec_pos(gb, vals, sel_flag, sel_len, vals); |
||
| 468 | prev_vec1 = MKVAL(vals); |
||
| 469 | } |
||
| 470 | for (i = 0; i < 3; i++) { |
||
| 471 | for (k = 0; k < 16 - split; k++) { |
||
| 472 | *dst[i]++ = get_value_cached(gb, vals[i], vec[i], |
||
| 473 | vec_len[i], i, val_shift, |
||
| 474 | prev_pix); |
||
| 475 | prev_mode[split + k] = MKVAL(vals); |
||
| 476 | } |
||
| 477 | } |
||
| 478 | } |
||
| 479 | } |
||
| 480 | } |
||
| 481 | |||
| 482 | for (i = 0; i < 3; i++) |
||
| 483 | for (j = 0; j < 16; j++) |
||
| 484 | memcpy(picdst[i] + mb_x * 16 + j * ctx->pic->linesize[i], |
||
| 485 | ctx->imgbuf[i] + j * 16, 16); |
||
| 486 | |||
| 487 | return 0; |
||
| 488 | } |
||
| 489 | |||
| 490 | static inline void mss4_update_dc_cache(MSS4Context *c, int mb_x) |
||
| 491 | { |
||
| 492 | int i; |
||
| 493 | |||
| 494 | c->dc_cache[0][TOP] = c->prev_dc[0][mb_x * 2 + 1]; |
||
| 495 | c->dc_cache[0][LEFT] = 0; |
||
| 496 | c->dc_cache[1][TOP] = 0; |
||
| 497 | c->dc_cache[1][LEFT] = 0; |
||
| 498 | |||
| 499 | for (i = 0; i < 2; i++) |
||
| 500 | c->prev_dc[0][mb_x * 2 + i] = 0; |
||
| 501 | |||
| 502 | for (i = 1; i < 3; i++) { |
||
| 503 | c->dc_cache[i + 1][TOP] = c->prev_dc[i][mb_x]; |
||
| 504 | c->dc_cache[i + 1][LEFT] = 0; |
||
| 505 | c->prev_dc[i][mb_x] = 0; |
||
| 506 | } |
||
| 507 | } |
||
| 508 | |||
| 509 | static int mss4_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
||
| 510 | AVPacket *avpkt) |
||
| 511 | { |
||
| 512 | const uint8_t *buf = avpkt->data; |
||
| 513 | int buf_size = avpkt->size; |
||
| 514 | MSS4Context *c = avctx->priv_data; |
||
| 515 | GetBitContext gb; |
||
| 516 | GetByteContext bc; |
||
| 517 | uint8_t *dst[3]; |
||
| 518 | int width, height, quality, frame_type; |
||
| 519 | int x, y, i, mb_width, mb_height, blk_type; |
||
| 520 | int ret; |
||
| 521 | |||
| 522 | if (buf_size < HEADER_SIZE) { |
||
| 523 | av_log(avctx, AV_LOG_ERROR, |
||
| 524 | "Frame should have at least %d bytes, got %d instead\n", |
||
| 525 | HEADER_SIZE, buf_size); |
||
| 526 | return AVERROR_INVALIDDATA; |
||
| 527 | } |
||
| 528 | |||
| 529 | bytestream2_init(&bc, buf, buf_size); |
||
| 530 | width = bytestream2_get_be16(&bc); |
||
| 531 | height = bytestream2_get_be16(&bc); |
||
| 532 | bytestream2_skip(&bc, 2); |
||
| 533 | quality = bytestream2_get_byte(&bc); |
||
| 534 | frame_type = bytestream2_get_byte(&bc); |
||
| 535 | |||
| 536 | if (width > avctx->width || |
||
| 537 | height != avctx->height) { |
||
| 538 | av_log(avctx, AV_LOG_ERROR, "Invalid frame dimensions %dx%d\n", |
||
| 539 | width, height); |
||
| 540 | return AVERROR_INVALIDDATA; |
||
| 541 | } |
||
| 542 | if (quality < 1 || quality > 100) { |
||
| 543 | av_log(avctx, AV_LOG_ERROR, "Invalid quality setting %d\n", quality); |
||
| 544 | return AVERROR_INVALIDDATA; |
||
| 545 | } |
||
| 546 | if ((frame_type & ~3) || frame_type == 3) { |
||
| 547 | av_log(avctx, AV_LOG_ERROR, "Invalid frame type %d\n", frame_type); |
||
| 548 | return AVERROR_INVALIDDATA; |
||
| 549 | } |
||
| 550 | |||
| 551 | if (frame_type != SKIP_FRAME && !bytestream2_get_bytes_left(&bc)) { |
||
| 552 | av_log(avctx, AV_LOG_ERROR, |
||
| 553 | "Empty frame found but it is not a skip frame.\n"); |
||
| 554 | return AVERROR_INVALIDDATA; |
||
| 555 | } |
||
| 556 | |||
| 557 | if ((ret = ff_reget_buffer(avctx, c->pic)) < 0) |
||
| 558 | return ret; |
||
| 559 | c->pic->key_frame = (frame_type == INTRA_FRAME); |
||
| 560 | c->pic->pict_type = (frame_type == INTRA_FRAME) ? AV_PICTURE_TYPE_I |
||
| 561 | : AV_PICTURE_TYPE_P; |
||
| 562 | if (frame_type == SKIP_FRAME) { |
||
| 563 | *got_frame = 1; |
||
| 564 | if ((ret = av_frame_ref(data, c->pic)) < 0) |
||
| 565 | return ret; |
||
| 566 | |||
| 567 | return buf_size; |
||
| 568 | } |
||
| 569 | |||
| 570 | if (c->quality != quality) { |
||
| 571 | c->quality = quality; |
||
| 572 | for (i = 0; i < 2; i++) |
||
| 573 | ff_mss34_gen_quant_mat(c->quant_mat[i], quality, !i); |
||
| 574 | } |
||
| 575 | |||
| 576 | init_get_bits8(&gb, buf + HEADER_SIZE, (buf_size - HEADER_SIZE)); |
||
| 577 | |||
| 578 | mb_width = FFALIGN(width, 16) >> 4; |
||
| 579 | mb_height = FFALIGN(height, 16) >> 4; |
||
| 580 | dst[0] = c->pic->data[0]; |
||
| 581 | dst[1] = c->pic->data[1]; |
||
| 582 | dst[2] = c->pic->data[2]; |
||
| 583 | |||
| 584 | memset(c->prev_vec, 0, sizeof(c->prev_vec)); |
||
| 585 | for (y = 0; y < mb_height; y++) { |
||
| 586 | memset(c->dc_cache, 0, sizeof(c->dc_cache)); |
||
| 587 | for (x = 0; x < mb_width; x++) { |
||
| 588 | blk_type = decode012(&gb); |
||
| 589 | switch (blk_type) { |
||
| 590 | case DCT_BLOCK: |
||
| 591 | if (mss4_decode_dct_block(c, &gb, dst, x, y) < 0) { |
||
| 592 | av_log(avctx, AV_LOG_ERROR, |
||
| 593 | "Error decoding DCT block %d,%d\n", |
||
| 594 | x, y); |
||
| 595 | return AVERROR_INVALIDDATA; |
||
| 596 | } |
||
| 597 | break; |
||
| 598 | case IMAGE_BLOCK: |
||
| 599 | if (mss4_decode_image_block(c, &gb, dst, x, y) < 0) { |
||
| 600 | av_log(avctx, AV_LOG_ERROR, |
||
| 601 | "Error decoding VQ block %d,%d\n", |
||
| 602 | x, y); |
||
| 603 | return AVERROR_INVALIDDATA; |
||
| 604 | } |
||
| 605 | break; |
||
| 606 | case SKIP_BLOCK: |
||
| 607 | if (frame_type == INTRA_FRAME) { |
||
| 608 | av_log(avctx, AV_LOG_ERROR, "Skip block in intra frame\n"); |
||
| 609 | return AVERROR_INVALIDDATA; |
||
| 610 | } |
||
| 611 | break; |
||
| 612 | } |
||
| 613 | if (blk_type != DCT_BLOCK) |
||
| 614 | mss4_update_dc_cache(c, x); |
||
| 615 | } |
||
| 616 | dst[0] += c->pic->linesize[0] * 16; |
||
| 617 | dst[1] += c->pic->linesize[1] * 16; |
||
| 618 | dst[2] += c->pic->linesize[2] * 16; |
||
| 619 | } |
||
| 620 | |||
| 621 | if ((ret = av_frame_ref(data, c->pic)) < 0) |
||
| 622 | return ret; |
||
| 623 | |||
| 624 | *got_frame = 1; |
||
| 625 | |||
| 626 | return buf_size; |
||
| 627 | } |
||
| 628 | |||
| 629 | static av_cold int mss4_decode_init(AVCodecContext *avctx) |
||
| 630 | { |
||
| 631 | MSS4Context * const c = avctx->priv_data; |
||
| 632 | int i; |
||
| 633 | |||
| 634 | c->pic = av_frame_alloc(); |
||
| 635 | if (!c->pic) |
||
| 636 | return AVERROR(ENOMEM); |
||
| 637 | |||
| 638 | if (mss4_init_vlcs(c)) { |
||
| 639 | av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n"); |
||
| 640 | mss4_free_vlcs(c); |
||
| 641 | return AVERROR(ENOMEM); |
||
| 642 | } |
||
| 643 | for (i = 0; i < 3; i++) { |
||
| 644 | c->dc_stride[i] = FFALIGN(avctx->width, 16) >> (2 + !!i); |
||
| 645 | c->prev_dc[i] = av_malloc(sizeof(**c->prev_dc) * c->dc_stride[i]); |
||
| 646 | if (!c->prev_dc[i]) { |
||
| 647 | av_log(avctx, AV_LOG_ERROR, "Cannot allocate buffer\n"); |
||
| 648 | mss4_free_vlcs(c); |
||
| 649 | return AVERROR(ENOMEM); |
||
| 650 | } |
||
| 651 | } |
||
| 652 | |||
| 653 | avctx->pix_fmt = AV_PIX_FMT_YUV444P; |
||
| 654 | |||
| 655 | return 0; |
||
| 656 | } |
||
| 657 | |||
| 658 | static av_cold int mss4_decode_end(AVCodecContext *avctx) |
||
| 659 | { |
||
| 660 | MSS4Context * const c = avctx->priv_data; |
||
| 661 | int i; |
||
| 662 | |||
| 663 | av_frame_free(&c->pic); |
||
| 664 | |||
| 665 | for (i = 0; i < 3; i++) |
||
| 666 | av_freep(&c->prev_dc[i]); |
||
| 667 | mss4_free_vlcs(c); |
||
| 668 | |||
| 669 | return 0; |
||
| 670 | } |
||
| 671 | |||
| 672 | AVCodec ff_mts2_decoder = { |
||
| 673 | .name = "mts2", |
||
| 674 | .long_name = NULL_IF_CONFIG_SMALL("MS Expression Encoder Screen"), |
||
| 675 | .type = AVMEDIA_TYPE_VIDEO, |
||
| 676 | .id = AV_CODEC_ID_MTS2, |
||
| 677 | .priv_data_size = sizeof(MSS4Context), |
||
| 678 | .init = mss4_decode_init, |
||
| 679 | .close = mss4_decode_end, |
||
| 680 | .decode = mss4_decode_frame, |
||
| 681 | .capabilities = CODEC_CAP_DR1, |
||
| 682 | }; |