| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * FM Screen Capture Codec decoder | ||
| 3 | * | ||
| 4 | * Copyright (c) 2017 Paul B Mahol | ||
| 5 | * | ||
| 6 | * This file is part of FFmpeg. | ||
| 7 | * | ||
| 8 | * FFmpeg is free software; you can redistribute it and/or | ||
| 9 | * modify it under the terms of the GNU Lesser General Public | ||
| 10 | * License as published by the Free Software Foundation; either | ||
| 11 | * version 2.1 of the License, or (at your option) any later version. | ||
| 12 | * | ||
| 13 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 16 | * Lesser General Public License for more details. | ||
| 17 | * | ||
| 18 | * You should have received a copy of the GNU Lesser General Public | ||
| 19 | * License along with FFmpeg; if not, write to the Free Software | ||
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 21 | */ | ||
| 22 | |||
| 23 | #include <stdio.h> | ||
| 24 | #include <string.h> | ||
| 25 | |||
| 26 | #include "libavutil/mem.h" | ||
| 27 | #include "avcodec.h" | ||
| 28 | #include "bytestream.h" | ||
| 29 | #include "codec_internal.h" | ||
| 30 | #include "decode.h" | ||
| 31 | |||
| 32 | #define BLOCK_HEIGHT 112u | ||
| 33 | #define BLOCK_WIDTH 84u | ||
| 34 | |||
| 35 | typedef struct InterBlock { | ||
| 36 | int w, h; | ||
| 37 | int size; | ||
| 38 | int xor; | ||
| 39 | } InterBlock; | ||
| 40 | |||
| 41 | typedef struct FMVCContext { | ||
| 42 | GetByteContext gb; | ||
| 43 | PutByteContext pb; | ||
| 44 | uint8_t *buffer; | ||
| 45 | size_t buffer_size; | ||
| 46 | uint8_t *pbuffer; | ||
| 47 | size_t pbuffer_size; | ||
| 48 | ptrdiff_t stride; | ||
| 49 | int bpp; | ||
| 50 | int yb, xb; | ||
| 51 | InterBlock *blocks; | ||
| 52 | unsigned nb_blocks; | ||
| 53 | } FMVCContext; | ||
| 54 | |||
| 55 | 72 | static int decode_type2(GetByteContext *gb, PutByteContext *pb) | |
| 56 | { | ||
| 57 | 72 | unsigned repeat = 0, first = 1, opcode = 0; | |
| 58 | int i, len, pos; | ||
| 59 | |||
| 60 |
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4593 | while (bytestream2_get_bytes_left(gb) > 0) { |
| 61 | GetByteContext gbc; | ||
| 62 | |||
| 63 |
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33101 | while (bytestream2_get_bytes_left(gb) > 0) { |
| 64 |
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33101 | if (first) { |
| 65 | 72 | first = 0; | |
| 66 |
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72 | if (bytestream2_peek_byte(gb) > 17) { |
| 67 | 72 | len = bytestream2_get_byte(gb) - 17; | |
| 68 |
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72 | if (len < 4) { |
| 69 | do { | ||
| 70 | 65 | bytestream2_put_byte(pb, bytestream2_get_byte(gb)); | |
| 71 | 65 | --len; | |
| 72 |
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65 | } while (len); |
| 73 | 65 | opcode = bytestream2_peek_byte(gb); | |
| 74 | 65 | continue; | |
| 75 | } else { | ||
| 76 | do { | ||
| 77 | 103 | bytestream2_put_byte(pb, bytestream2_get_byte(gb)); | |
| 78 | 103 | --len; | |
| 79 |
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103 | } while (len); |
| 80 | 7 | opcode = bytestream2_peek_byte(gb); | |
| 81 |
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7 | if (opcode < 0x10) { |
| 82 | ✗ | bytestream2_skip(gb, 1); | |
| 83 | ✗ | pos = - (opcode >> 2) - 4 * bytestream2_get_byte(gb) - 2049; | |
| 84 | |||
| 85 | ✗ | bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start); | |
| 86 | ✗ | bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET); | |
| 87 | |||
| 88 | ✗ | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 89 | ✗ | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 90 | ✗ | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 91 | ✗ | len = opcode & 3; | |
| 92 | ✗ | if (!len) { | |
| 93 | ✗ | repeat = 1; | |
| 94 | } else { | ||
| 95 | do { | ||
| 96 | ✗ | bytestream2_put_byte(pb, bytestream2_get_byte(gb)); | |
| 97 | ✗ | --len; | |
| 98 | ✗ | } while (len); | |
| 99 | ✗ | opcode = bytestream2_peek_byte(gb); | |
| 100 | } | ||
| 101 | ✗ | continue; | |
| 102 | } | ||
| 103 | } | ||
| 104 | 7 | repeat = 0; | |
| 105 | } | ||
| 106 | 7 | repeat = 1; | |
| 107 | } | ||
| 108 |
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33036 | if (repeat) { |
| 109 | 26608 | repeat = 0; | |
| 110 | 26608 | opcode = bytestream2_peek_byte(gb); | |
| 111 |
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26608 | if (opcode < 0x10) { |
| 112 | 586 | bytestream2_skip(gb, 1); | |
| 113 |
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586 | if (!opcode) { |
| 114 |
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82 | if (!bytestream2_peek_byte(gb)) { |
| 115 | do { | ||
| 116 | ✗ | bytestream2_skip(gb, 1); | |
| 117 | ✗ | opcode += 255; | |
| 118 | ✗ | } while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0); | |
| 119 | } | ||
| 120 | 82 | opcode += bytestream2_get_byte(gb) + 15; | |
| 121 | } | ||
| 122 | 586 | bytestream2_put_le32(pb, bytestream2_get_le32(gb)); | |
| 123 |
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4212 | for (i = opcode - 1; i > 0; --i) |
| 124 | 3626 | bytestream2_put_byte(pb, bytestream2_get_byte(gb)); | |
| 125 | 586 | opcode = bytestream2_peek_byte(gb); | |
| 126 |
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586 | if (opcode < 0x10) { |
| 127 | 28 | bytestream2_skip(gb, 1); | |
| 128 | 28 | pos = - (opcode >> 2) - 4 * bytestream2_get_byte(gb) - 2049; | |
| 129 | |||
| 130 | 28 | bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start); | |
| 131 | 28 | bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET); | |
| 132 | |||
| 133 | 28 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 134 | 28 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 135 | 28 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 136 | 28 | len = opcode & 3; | |
| 137 |
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28 | if (!len) { |
| 138 | 22 | repeat = 1; | |
| 139 | } else { | ||
| 140 | do { | ||
| 141 | 17 | bytestream2_put_byte(pb, bytestream2_get_byte(gb)); | |
| 142 | 17 | --len; | |
| 143 |
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17 | } while (len); |
| 144 | 6 | opcode = bytestream2_peek_byte(gb); | |
| 145 | } | ||
| 146 | 28 | continue; | |
| 147 | } | ||
| 148 | } | ||
| 149 | } | ||
| 150 | |||
| 151 |
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33008 | if (opcode >= 0x40) { |
| 152 | 6293 | bytestream2_skip(gb, 1); | |
| 153 | 6293 | pos = - ((opcode >> 2) & 7) - 1 - 8 * bytestream2_get_byte(gb); | |
| 154 | 6293 | len = (opcode >> 5) - 1; | |
| 155 | |||
| 156 | 6293 | bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start); | |
| 157 | 6293 | bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET); | |
| 158 | |||
| 159 | 6293 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 160 | 6293 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 161 | do { | ||
| 162 | 15169 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 163 | 15169 | --len; | |
| 164 |
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15169 | } while (len); |
| 165 | |||
| 166 | 6293 | len = opcode & 3; | |
| 167 | |||
| 168 |
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6293 | if (!len) { |
| 169 | 3620 | repeat = 1; | |
| 170 | } else { | ||
| 171 | do { | ||
| 172 | 4856 | bytestream2_put_byte(pb, bytestream2_get_byte(gb)); | |
| 173 | 4856 | --len; | |
| 174 |
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4856 | } while (len); |
| 175 | 2673 | opcode = bytestream2_peek_byte(gb); | |
| 176 | } | ||
| 177 | 6293 | continue; | |
| 178 |
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26715 | } else if (opcode < 0x20) { |
| 179 | 4593 | break; | |
| 180 | } | ||
| 181 | 22122 | len = opcode & 0x1F; | |
| 182 | 22122 | bytestream2_skip(gb, 1); | |
| 183 |
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22122 | if (!len) { |
| 184 |
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7443 | if (!bytestream2_peek_byte(gb)) { |
| 185 | do { | ||
| 186 | 9973 | bytestream2_skip(gb, 1); | |
| 187 | 9973 | len += 255; | |
| 188 |
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9973 | } while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0); |
| 189 | } | ||
| 190 | 7443 | len += bytestream2_get_byte(gb) + 31; | |
| 191 | } | ||
| 192 | 22122 | i = bytestream2_get_le16(gb); | |
| 193 | 22122 | pos = - (i >> 2) - 1; | |
| 194 | |||
| 195 | 22122 | bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start); | |
| 196 | 22122 | bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET); | |
| 197 | |||
| 198 |
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22122 | if (len < 6 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) { |
| 199 | 3050 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 200 | 3050 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 201 | do { | ||
| 202 | 1990991 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 203 | 1990991 | --len; | |
| 204 |
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1990991 | } while (len); |
| 205 | } else { | ||
| 206 | 19072 | bytestream2_put_le32(pb, bytestream2_get_le32(&gbc)); | |
| 207 |
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1700600 | for (len = len - 2; len; --len) |
| 208 | 1681528 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 209 | } | ||
| 210 | 22122 | len = i & 3; | |
| 211 |
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22122 | if (!len) { |
| 212 | 19401 | repeat = 1; | |
| 213 | } else { | ||
| 214 | do { | ||
| 215 | 5082 | bytestream2_put_byte(pb, bytestream2_get_byte(gb)); | |
| 216 | 5082 | --len; | |
| 217 |
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5082 | } while (len); |
| 218 | 2721 | opcode = bytestream2_peek_byte(gb); | |
| 219 | } | ||
| 220 | } | ||
| 221 | 4593 | bytestream2_skip(gb, 1); | |
| 222 |
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4593 | if (opcode < 0x10) { |
| 223 | 998 | pos = -(opcode >> 2) - 1 - 4 * bytestream2_get_byte(gb); | |
| 224 | |||
| 225 | 998 | bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start); | |
| 226 | 998 | bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET); | |
| 227 | |||
| 228 | 998 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 229 | 998 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 230 | 998 | len = opcode & 3; | |
| 231 |
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998 | if (!len) { |
| 232 | 371 | repeat = 1; | |
| 233 | } else { | ||
| 234 | do { | ||
| 235 | 1101 | bytestream2_put_byte(pb, bytestream2_get_byte(gb)); | |
| 236 | 1101 | --len; | |
| 237 |
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1101 | } while (len); |
| 238 | 627 | opcode = bytestream2_peek_byte(gb); | |
| 239 | } | ||
| 240 | 998 | continue; | |
| 241 | } | ||
| 242 | 3595 | len = opcode & 7; | |
| 243 |
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3595 | if (!len) { |
| 244 |
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3085 | if (!bytestream2_peek_byte(gb)) { |
| 245 | do { | ||
| 246 | 411 | bytestream2_skip(gb, 1); | |
| 247 | 411 | len += 255; | |
| 248 |
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411 | } while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0); |
| 249 | } | ||
| 250 | 3085 | len += bytestream2_get_byte(gb) + 7; | |
| 251 | } | ||
| 252 | 3595 | i = bytestream2_get_le16(gb); | |
| 253 | 3595 | pos = bytestream2_tell_p(pb) - 2048 * (opcode & 8); | |
| 254 | 3595 | pos = pos - (i >> 2); | |
| 255 |
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3595 | if (pos == bytestream2_tell_p(pb)) |
| 256 | 72 | break; | |
| 257 | |||
| 258 | 3523 | pos = pos - 0x4000; | |
| 259 | 3523 | bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start); | |
| 260 | 3523 | bytestream2_seek(&gbc, pos, SEEK_SET); | |
| 261 | |||
| 262 |
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3523 | if (len < 6 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) { |
| 263 | 216 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 264 | 216 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 265 | do { | ||
| 266 | 667 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 267 | 667 | --len; | |
| 268 |
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667 | } while (len); |
| 269 | } else { | ||
| 270 | 3307 | bytestream2_put_le32(pb, bytestream2_get_le32(&gbc)); | |
| 271 |
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219261 | for (len = len - 2; len; --len) |
| 272 | 215954 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 273 | } | ||
| 274 | |||
| 275 | 3523 | len = i & 3; | |
| 276 |
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3523 | if (!len) { |
| 277 | 3187 | repeat = 1; | |
| 278 | } else { | ||
| 279 | do { | ||
| 280 | 551 | bytestream2_put_byte(pb, bytestream2_get_byte(gb)); | |
| 281 | 551 | --len; | |
| 282 |
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551 | } while (len); |
| 283 | 336 | opcode = bytestream2_peek_byte(gb); | |
| 284 | } | ||
| 285 | } | ||
| 286 | |||
| 287 | 72 | return 0; | |
| 288 | } | ||
| 289 | |||
| 290 | 42 | static int decode_type1(GetByteContext *gb, PutByteContext *pb) | |
| 291 | { | ||
| 292 | 42 | unsigned opcode = 0, len; | |
| 293 | 42 | int high = 0; | |
| 294 | int i, pos; | ||
| 295 | |||
| 296 |
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10429 | while (bytestream2_get_bytes_left(gb) > 0) { |
| 297 | GetByteContext gbc; | ||
| 298 | |||
| 299 |
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21442 | while (bytestream2_get_bytes_left(gb) > 0) { |
| 300 |
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21442 | while (bytestream2_get_bytes_left(gb) > 0) { |
| 301 | 21442 | opcode = bytestream2_get_byte(gb); | |
| 302 | 21442 | high = opcode >= 0x20; | |
| 303 |
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21442 | if (high) |
| 304 | 18221 | break; | |
| 305 |
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3221 | if (opcode) |
| 306 | 3220 | break; | |
| 307 | 1 | opcode = bytestream2_get_byte(gb); | |
| 308 |
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1 | if (opcode < 0xF8) { |
| 309 | 1 | opcode += 32; | |
| 310 | 1 | break; | |
| 311 | } | ||
| 312 | ✗ | i = opcode - 0xF8; | |
| 313 | ✗ | if (i) { | |
| 314 | ✗ | len = 256; | |
| 315 | do { | ||
| 316 | ✗ | len *= 2; | |
| 317 | ✗ | --i; | |
| 318 | ✗ | } while (i); | |
| 319 | } else { | ||
| 320 | ✗ | len = 280; | |
| 321 | } | ||
| 322 | do { | ||
| 323 | ✗ | bytestream2_put_le32(pb, bytestream2_get_le32(gb)); | |
| 324 | ✗ | bytestream2_put_le32(pb, bytestream2_get_le32(gb)); | |
| 325 | ✗ | len -= 8; | |
| 326 | ✗ | } while (len && bytestream2_get_bytes_left(gb) > 0); | |
| 327 | } | ||
| 328 | |||
| 329 |
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21442 | if (!high) { |
| 330 | do { | ||
| 331 | 11005 | bytestream2_put_byte(pb, bytestream2_get_byte(gb)); | |
| 332 | 11005 | --opcode; | |
| 333 |
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11005 | } while (opcode && bytestream2_get_bytes_left(gb) > 0); |
| 334 | |||
| 335 |
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3223 | while (bytestream2_get_bytes_left(gb) > 0) { |
| 336 | GetByteContext gbc; | ||
| 337 | |||
| 338 | 3223 | opcode = bytestream2_get_byte(gb); | |
| 339 |
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3223 | if (opcode >= 0x20) |
| 340 | 3221 | break; | |
| 341 | 2 | bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start); | |
| 342 | |||
| 343 | 2 | pos = -(opcode | 32 * bytestream2_get_byte(gb)) - 1; | |
| 344 | 2 | bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET); | |
| 345 | 2 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 346 | 2 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 347 | 2 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 348 | 2 | bytestream2_put_byte(pb, bytestream2_get_byte(gb)); | |
| 349 | } | ||
| 350 | } | ||
| 351 | 21442 | high = 0; | |
| 352 |
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21442 | if (opcode < 0x40) |
| 353 | 10429 | break; | |
| 354 | 11013 | bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start); | |
| 355 | 11013 | pos = (-((opcode & 0x1F) | 32 * bytestream2_get_byte(gb)) - 1); | |
| 356 | 11013 | bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos, SEEK_SET); | |
| 357 | 11013 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 358 | 11013 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 359 | 11013 | len = (opcode >> 5) - 1; | |
| 360 | do { | ||
| 361 | 35434 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 362 | 35434 | --len; | |
| 363 |
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35434 | } while (len && bytestream2_get_bytes_left(&gbc) > 0); |
| 364 | } | ||
| 365 | 10429 | len = opcode & 0x1F; | |
| 366 |
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10429 | if (!len) { |
| 367 |
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3296 | if (!bytestream2_peek_byte(gb)) { |
| 368 | do { | ||
| 369 | 7405 | bytestream2_skip(gb, 1); | |
| 370 | 7405 | len += 255; | |
| 371 |
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7405 | } while (!bytestream2_peek_byte(gb) && bytestream2_get_bytes_left(gb) > 0); |
| 372 | } | ||
| 373 | 3296 | len += bytestream2_get_byte(gb) + 31; | |
| 374 | } | ||
| 375 | 10429 | pos = -bytestream2_get_byte(gb); | |
| 376 | 10429 | bytestream2_init(&gbc, pb->buffer_start, pb->buffer_end - pb->buffer_start); | |
| 377 | 10429 | bytestream2_seek(&gbc, bytestream2_tell_p(pb) + pos - (bytestream2_get_byte(gb) << 8), SEEK_SET); | |
| 378 |
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10429 | if (bytestream2_tell_p(pb) == bytestream2_tell(&gbc)) |
| 379 | 42 | break; | |
| 380 |
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10387 | if (len < 5 || bytestream2_tell_p(pb) - bytestream2_tell(&gbc) < 4) { |
| 381 | 1068 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 382 | 1068 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 383 | 1068 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 384 | } else { | ||
| 385 | 9319 | bytestream2_put_le32(pb, bytestream2_get_le32(&gbc)); | |
| 386 | 9319 | len--; | |
| 387 | } | ||
| 388 | do { | ||
| 389 | 2411287 | bytestream2_put_byte(pb, bytestream2_get_byte(&gbc)); | |
| 390 | 2411287 | len--; | |
| 391 |
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2411287 | } while (len && bytestream2_get_bytes_left(&gbc) > 0); |
| 392 | } | ||
| 393 | |||
| 394 | 42 | return 0; | |
| 395 | } | ||
| 396 | |||
| 397 | 34 | static int decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
| 398 | int *got_frame, AVPacket *avpkt) | ||
| 399 | { | ||
| 400 | 34 | FMVCContext *s = avctx->priv_data; | |
| 401 | 34 | GetByteContext *gb = &s->gb; | |
| 402 | 34 | PutByteContext *pb = &s->pb; | |
| 403 | int ret, y, x; | ||
| 404 | int key_frame; | ||
| 405 | |||
| 406 |
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34 | if (avpkt->size < 8) |
| 407 | ✗ | return AVERROR_INVALIDDATA; | |
| 408 | |||
| 409 | 34 | bytestream2_init(gb, avpkt->data, avpkt->size); | |
| 410 | 34 | bytestream2_skip(gb, 2); | |
| 411 | |||
| 412 | 34 | key_frame = !!bytestream2_get_le16(gb); | |
| 413 | |||
| 414 |
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34 | if (key_frame) { |
| 415 | const uint8_t *src; | ||
| 416 | unsigned type, size; | ||
| 417 | uint8_t *dst; | ||
| 418 | |||
| 419 | 2 | type = bytestream2_get_le16(gb); | |
| 420 | 2 | size = bytestream2_get_le16(gb); | |
| 421 |
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2 | if (size > bytestream2_get_bytes_left(gb)) |
| 422 | ✗ | return AVERROR_INVALIDDATA; | |
| 423 | |||
| 424 | 2 | bytestream2_init_writer(pb, s->buffer, s->buffer_size); | |
| 425 |
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2 | if (type == 1) { |
| 426 | 1 | decode_type1(gb, pb); | |
| 427 |
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1 | } else if (type == 2){ |
| 428 | 1 | decode_type2(gb, pb); | |
| 429 | } else { | ||
| 430 | ✗ | avpriv_report_missing_feature(avctx, "Compression type %d", type); | |
| 431 | ✗ | return AVERROR_PATCHWELCOME; | |
| 432 | } | ||
| 433 | |||
| 434 |
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2 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 435 | ✗ | return ret; | |
| 436 | |||
| 437 | 2 | frame->flags |= AV_FRAME_FLAG_KEY; | |
| 438 | 2 | frame->pict_type = AV_PICTURE_TYPE_I; | |
| 439 | |||
| 440 | 2 | src = s->buffer; | |
| 441 | 2 | dst = frame->data[0] + (avctx->height - 1) * frame->linesize[0]; | |
| 442 |
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960 | for (y = 0; y < avctx->height; y++) { |
| 443 | 958 | memcpy(dst, src, avctx->width * s->bpp); | |
| 444 | 958 | dst -= frame->linesize[0]; | |
| 445 | 958 | src += s->stride * 4; | |
| 446 |
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958 | if (bytestream2_tell_p(pb) < y*s->stride * 4) |
| 447 | ✗ | break; | |
| 448 | } | ||
| 449 | } else { | ||
| 450 | unsigned block, nb_blocks; | ||
| 451 | int type, k, l; | ||
| 452 | uint8_t *ssrc, *ddst; | ||
| 453 | const uint32_t *src; | ||
| 454 | uint32_t *dst; | ||
| 455 | |||
| 456 |
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1067 | for (block = 0; block < s->nb_blocks; block++) |
| 457 | 1035 | s->blocks[block].xor = 0; | |
| 458 | |||
| 459 | 32 | nb_blocks = bytestream2_get_le16(gb); | |
| 460 |
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32 | if (nb_blocks > s->nb_blocks) |
| 461 | ✗ | return AVERROR_INVALIDDATA; | |
| 462 | |||
| 463 | 32 | bytestream2_init_writer(pb, s->pbuffer, s->pbuffer_size); | |
| 464 | |||
| 465 | 32 | type = bytestream2_get_le16(gb); | |
| 466 |
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144 | for (block = 0; block < nb_blocks; block++) { |
| 467 | unsigned size, offset; | ||
| 468 | 112 | int start = 0; | |
| 469 | |||
| 470 | 112 | offset = bytestream2_get_le16(gb); | |
| 471 |
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112 | if (offset >= s->nb_blocks) |
| 472 | ✗ | return AVERROR_INVALIDDATA; | |
| 473 | |||
| 474 | 112 | size = bytestream2_get_le16(gb); | |
| 475 |
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112 | if (size > bytestream2_get_bytes_left(gb)) |
| 476 | ✗ | return AVERROR_INVALIDDATA; | |
| 477 | |||
| 478 | 112 | start = bytestream2_tell_p(pb); | |
| 479 |
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112 | if (type == 1) { |
| 480 | 41 | decode_type1(gb, pb); | |
| 481 |
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71 | } else if (type == 2){ |
| 482 | 71 | decode_type2(gb, pb); | |
| 483 | } else { | ||
| 484 | ✗ | avpriv_report_missing_feature(avctx, "Compression type %d", type); | |
| 485 | ✗ | return AVERROR_PATCHWELCOME; | |
| 486 | } | ||
| 487 | |||
| 488 |
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112 | if (s->blocks[offset].size * 4 != bytestream2_tell_p(pb) - start) |
| 489 | ✗ | return AVERROR_INVALIDDATA; | |
| 490 | |||
| 491 | 112 | s->blocks[offset].xor = 1; | |
| 492 | } | ||
| 493 | |||
| 494 | 32 | src = (const uint32_t *)s->pbuffer; | |
| 495 | 32 | dst = (uint32_t *)s->buffer; | |
| 496 | |||
| 497 |
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182 | for (block = 0, y = 0; y < s->yb; y++) { |
| 498 | 150 | int block_h = s->blocks[block].h; | |
| 499 | 150 | uint32_t *rect = dst; | |
| 500 | |||
| 501 |
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1185 | for (x = 0; x < s->xb; x++) { |
| 502 | 1035 | int block_w = s->blocks[block].w; | |
| 503 | 1035 | uint32_t *row = dst; | |
| 504 | |||
| 505 | 1035 | block_h = s->blocks[block].h; | |
| 506 |
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1035 | if (s->blocks[block].xor) { |
| 507 |
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13668 | for (k = 0; k < block_h; k++) { |
| 508 | 13556 | uint32_t *column = dst; | |
| 509 |
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1129796 | for (l = 0; l < block_w; l++) |
| 510 | 1116240 | *dst++ ^= *src++; | |
| 511 | 13556 | dst = &column[s->stride]; | |
| 512 | } | ||
| 513 | } | ||
| 514 | 1035 | dst = &row[block_w]; | |
| 515 | 1035 | ++block; | |
| 516 | } | ||
| 517 | 150 | dst = &rect[block_h * s->stride]; | |
| 518 | } | ||
| 519 | |||
| 520 |
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32 | if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
| 521 | ✗ | return ret; | |
| 522 | |||
| 523 | 32 | frame->flags &= ~AV_FRAME_FLAG_KEY; | |
| 524 | 32 | frame->pict_type = AV_PICTURE_TYPE_P; | |
| 525 | |||
| 526 | 32 | ssrc = s->buffer; | |
| 527 | 32 | ddst = frame->data[0] + (avctx->height - 1) * frame->linesize[0]; | |
| 528 |
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17494 | for (y = 0; y < avctx->height; y++) { |
| 529 | 17462 | memcpy(ddst, ssrc, avctx->width * s->bpp); | |
| 530 | 17462 | ddst -= frame->linesize[0]; | |
| 531 | 17462 | ssrc += s->stride * 4; | |
| 532 | } | ||
| 533 | } | ||
| 534 | |||
| 535 | 34 | *got_frame = 1; | |
| 536 | |||
| 537 | 34 | return avpkt->size; | |
| 538 | } | ||
| 539 | |||
| 540 | 4 | static av_cold int decode_init(AVCodecContext *avctx) | |
| 541 | { | ||
| 542 | 4 | FMVCContext *s = avctx->priv_data; | |
| 543 | 4 | int i, j, m, block = 0, h = BLOCK_HEIGHT, w = BLOCK_WIDTH; | |
| 544 | |||
| 545 |
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4 | switch (avctx->bits_per_coded_sample) { |
| 546 | ✗ | case 16: | |
| 547 | ✗ | avctx->pix_fmt = AV_PIX_FMT_RGB555LE; | |
| 548 | ✗ | break; | |
| 549 | 4 | case 24: | |
| 550 | 4 | avctx->pix_fmt = AV_PIX_FMT_BGR24; | |
| 551 | 4 | break; | |
| 552 | ✗ | case 32: | |
| 553 | ✗ | avctx->pix_fmt = AV_PIX_FMT_BGRA; | |
| 554 | ✗ | break; | |
| 555 | ✗ | default: | |
| 556 | ✗ | av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", | |
| 557 | avctx->bits_per_coded_sample); | ||
| 558 | ✗ | return AVERROR_INVALIDDATA; | |
| 559 | } | ||
| 560 | |||
| 561 | 4 | s->stride = (avctx->width * avctx->bits_per_coded_sample + 31) / 32; | |
| 562 | 4 | s->xb = s->stride / BLOCK_WIDTH; | |
| 563 | 4 | m = s->stride % BLOCK_WIDTH; | |
| 564 |
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4 | if (m) { |
| 565 |
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4 | if (m < 37) { |
| 566 | ✗ | w = m + BLOCK_WIDTH; | |
| 567 | } else { | ||
| 568 | 4 | w = m; | |
| 569 | 4 | s->xb++; | |
| 570 | } | ||
| 571 | } | ||
| 572 | |||
| 573 | 4 | s->yb = avctx->height / BLOCK_HEIGHT; | |
| 574 | 4 | m = avctx->height % BLOCK_HEIGHT; | |
| 575 |
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4 | if (m) { |
| 576 |
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4 | if (m < 49) { |
| 577 | 4 | h = m + BLOCK_HEIGHT; | |
| 578 | } else { | ||
| 579 | ✗ | h = m; | |
| 580 | ✗ | s->yb++; | |
| 581 | } | ||
| 582 | } | ||
| 583 | |||
| 584 | 4 | s->nb_blocks = s->xb * s->yb; | |
| 585 |
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4 | if (!s->nb_blocks) |
| 586 | ✗ | return AVERROR_INVALIDDATA; | |
| 587 | 4 | s->blocks = av_calloc(s->nb_blocks, sizeof(*s->blocks)); | |
| 588 |
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4 | if (!s->blocks) |
| 589 | ✗ | return AVERROR(ENOMEM); | |
| 590 | |||
| 591 |
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20 | for (i = 0; i < s->yb; i++) { |
| 592 |
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122 | for (j = 0; j < s->xb; j++) { |
| 593 |
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106 | if (i != (s->yb - 1) || j != (s->xb - 1)) { |
| 594 |
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102 | if (i == s->yb - 1) { |
| 595 | 22 | s->blocks[block].w = BLOCK_WIDTH; | |
| 596 | 22 | s->blocks[block].h = h; | |
| 597 | 22 | s->blocks[block].size = BLOCK_WIDTH * h; | |
| 598 |
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80 | } else if (j == s->xb - 1) { |
| 599 | 12 | s->blocks[block].w = w; | |
| 600 | 12 | s->blocks[block].h = BLOCK_HEIGHT; | |
| 601 | 12 | s->blocks[block].size = BLOCK_HEIGHT * w; | |
| 602 | } else { | ||
| 603 | 68 | s->blocks[block].w = BLOCK_WIDTH; | |
| 604 | 68 | s->blocks[block].h = BLOCK_HEIGHT; | |
| 605 | 68 | s->blocks[block].size = BLOCK_WIDTH * BLOCK_HEIGHT; | |
| 606 | } | ||
| 607 | } else { | ||
| 608 | 4 | s->blocks[block].w = w; | |
| 609 | 4 | s->blocks[block].h = h; | |
| 610 | 4 | s->blocks[block].size = w * h; | |
| 611 | } | ||
| 612 | 106 | block++; | |
| 613 | } | ||
| 614 | } | ||
| 615 | |||
| 616 | 4 | s->bpp = avctx->bits_per_coded_sample >> 3; | |
| 617 | 4 | s->buffer_size = avctx->width * avctx->height * 4; | |
| 618 | 4 | s->pbuffer_size = avctx->width * avctx->height * 4; | |
| 619 | 4 | s->buffer = av_mallocz(s->buffer_size); | |
| 620 | 4 | s->pbuffer = av_mallocz(s->pbuffer_size); | |
| 621 |
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4 | if (!s->buffer || !s->pbuffer) |
| 622 | ✗ | return AVERROR(ENOMEM); | |
| 623 | |||
| 624 | 4 | return 0; | |
| 625 | } | ||
| 626 | |||
| 627 | 4 | static av_cold int decode_close(AVCodecContext *avctx) | |
| 628 | { | ||
| 629 | 4 | FMVCContext *s = avctx->priv_data; | |
| 630 | |||
| 631 | 4 | av_freep(&s->buffer); | |
| 632 | 4 | av_freep(&s->pbuffer); | |
| 633 | 4 | av_freep(&s->blocks); | |
| 634 | |||
| 635 | 4 | return 0; | |
| 636 | } | ||
| 637 | |||
| 638 | const FFCodec ff_fmvc_decoder = { | ||
| 639 | .p.name = "fmvc", | ||
| 640 | CODEC_LONG_NAME("FM Screen Capture Codec"), | ||
| 641 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
| 642 | .p.id = AV_CODEC_ID_FMVC, | ||
| 643 | .priv_data_size = sizeof(FMVCContext), | ||
| 644 | .init = decode_init, | ||
| 645 | .close = decode_close, | ||
| 646 | FF_CODEC_DECODE_CB(decode_frame), | ||
| 647 | .p.capabilities = AV_CODEC_CAP_DR1, | ||
| 648 | .caps_internal = FF_CODEC_CAP_INIT_CLEANUP, | ||
| 649 | }; | ||
| 650 |