| @@ -0,0 +1,653 @@ |
| 1 | +/* |
| 2 | + * Amuse Graphics Movie decoder |
| 3 | + * |
| 4 | + * Copyright (c) 2018 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 <stdlib.h> |
| 25 | +#include <string.h> |
| 26 | + |
| 27 | +#define BITSTREAM_READER_LE |
| 28 | + |
| 29 | +#include "avcodec.h" |
| 30 | +#include "bytestream.h" |
| 31 | +#include "copy_block.h" |
| 32 | +#include "get_bits.h" |
| 33 | +#include "idctdsp.h" |
| 34 | +#include "internal.h" |
| 35 | + |
| 36 | +static const uint8_t unscaled_luma[64] = { |
| 37 | + 16, 11, 10, 16, 24, 40, 51, 61, 12, 12, 14, 19, |
| 38 | + 26, 58, 60, 55, 14, 13, 16, 24, 40, 57, 69, 56, |
| 39 | + 14, 17, 22, 29, 51, 87, 80, 62, 18, 22, 37, 56, |
| 40 | + 68,109,103, 77, 24, 35, 55, 64, 81,104,113, 92, |
| 41 | + 49, 64, 78, 87,103,121,120,101, 72, 92, 95, 98, |
| 42 | + 112,100,103,99 |
| 43 | +}; |
| 44 | + |
| 45 | +static const uint8_t unscaled_chroma[64] = { |
| 46 | + 17, 18, 24, 47, 99, 99, 99, 99, 18, 21, 26, 66, |
| 47 | + 99, 99, 99, 99, 24, 26, 56, 99, 99, 99, 99, 99, |
| 48 | + 47, 66, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, |
| 49 | + 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, |
| 50 | + 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, |
| 51 | + 99, 99, 99, 99 |
| 52 | +}; |
| 53 | + |
| 54 | +typedef struct MotionVector { |
| 55 | + int16_t x, y; |
| 56 | +} MotionVector; |
| 57 | + |
| 58 | +typedef struct AGMContext { |
| 59 | + const AVClass *class; |
| 60 | + AVCodecContext *avctx; |
| 61 | + GetBitContext gb; |
| 62 | + GetByteContext gbyte; |
| 63 | + |
| 64 | + int key_frame; |
| 65 | + int bitstream_size; |
| 66 | + int compression; |
| 67 | + int blocks_w; |
| 68 | + int blocks_h; |
| 69 | + int size[3]; |
| 70 | + int plus; |
| 71 | + unsigned flags; |
| 72 | + unsigned fflags; |
| 73 | + |
| 74 | + MotionVector *mvectors; |
| 75 | + int mvectors_size; |
| 76 | + |
| 77 | + AVFrame *prev_frame; |
| 78 | + |
| 79 | + int luma_quant_matrix[64]; |
| 80 | + int chroma_quant_matrix[64]; |
| 81 | + |
| 82 | + ScanTable scantable; |
| 83 | + DECLARE_ALIGNED(32, int16_t, block)[64]; |
| 84 | + IDCTDSPContext idsp; |
| 85 | +} AGMContext; |
| 86 | + |
| 87 | +static int read_code(GetBitContext *gb, int *oskip, int *level, int *map, int mode) |
| 88 | +{ |
| 89 | + int len = 0, skip = 0, max; |
| 90 | + |
| 91 | + if (show_bits(gb, 2)) { |
| 92 | + switch (show_bits(gb, 4)) { |
| 93 | + case 1: |
| 94 | + case 9: |
| 95 | + len = 1; |
| 96 | + skip = 3; |
| 97 | + break; |
| 98 | + case 2: |
| 99 | + len = 3; |
| 100 | + skip = 4; |
| 101 | + break; |
| 102 | + case 3: |
| 103 | + len = 7; |
| 104 | + skip = 4; |
| 105 | + break; |
| 106 | + case 5: |
| 107 | + case 13: |
| 108 | + len = 2; |
| 109 | + skip = 3; |
| 110 | + break; |
| 111 | + case 6: |
| 112 | + len = 4; |
| 113 | + skip = 4; |
| 114 | + break; |
| 115 | + case 7: |
| 116 | + len = 8; |
| 117 | + skip = 4; |
| 118 | + break; |
| 119 | + case 10: |
| 120 | + len = 5; |
| 121 | + skip = 4; |
| 122 | + break; |
| 123 | + case 11: |
| 124 | + len = 9; |
| 125 | + skip = 4; |
| 126 | + break; |
| 127 | + case 14: |
| 128 | + len = 6; |
| 129 | + skip = 4; |
| 130 | + break; |
| 131 | + case 15: |
| 132 | + len = ((show_bits(gb, 5) & 0x10) | 0xA0) >> 4; |
| 133 | + skip = 5; |
| 134 | + break; |
| 135 | + default: |
| 136 | + return AVERROR_INVALIDDATA; |
| 137 | + } |
| 138 | + |
| 139 | + skip_bits(gb, skip); |
| 140 | + *level = get_bits(gb, len); |
| 141 | + *map = 1; |
| 142 | + *oskip = 0; |
| 143 | + max = 1 << (len - 1); |
| 144 | + if (*level < max) |
| 145 | + *level = -(max + *level); |
| 146 | + } else if (show_bits(gb, 3) & 4) { |
| 147 | + skip_bits(gb, 3); |
| 148 | + if (mode == 1) { |
| 149 | + if (show_bits(gb, 4)) { |
| 150 | + if (show_bits(gb, 4) == 1) { |
| 151 | + skip_bits(gb, 4); |
| 152 | + *oskip = get_bits(gb, 16); |
| 153 | + } else { |
| 154 | + *oskip = get_bits(gb, 4); |
| 155 | + } |
| 156 | + } else { |
| 157 | + skip_bits(gb, 4); |
| 158 | + *oskip = get_bits(gb, 10); |
| 159 | + } |
| 160 | + } else if (mode == 0) { |
| 161 | + *oskip = get_bits(gb, 10); |
| 162 | + } |
| 163 | + *level = 0; |
| 164 | + } else { |
| 165 | + skip_bits(gb, 3); |
| 166 | + if (mode == 0) |
| 167 | + *oskip = get_bits(gb, 4); |
| 168 | + else if (mode == 1) |
| 169 | + *oskip = 0; |
| 170 | + *level = 0; |
| 171 | + } |
| 172 | + |
| 173 | + return 0; |
| 174 | +} |
| 175 | + |
| 176 | +static int decode_intra_block(AGMContext *s, GetBitContext *gb, int size, |
| 177 | + const int *quant_matrix, int *skip, int *dc_level) |
| 178 | +{ |
| 179 | + const uint8_t *scantable = s->scantable.permutated; |
| 180 | + const int offset = s->plus ? 0 : 1024; |
| 181 | + int16_t *block = s->block; |
| 182 | + int level, ret, map = 0; |
| 183 | + |
| 184 | + memset(block, 0, sizeof(s->block)); |
| 185 | + |
| 186 | + if (*skip > 0) { |
| 187 | + (*skip)--; |
| 188 | + } else { |
| 189 | + ret = read_code(gb, skip, &level, &map, s->flags & 1); |
| 190 | + if (ret < 0) |
| 191 | + return ret; |
| 192 | + *dc_level += level; |
| 193 | + } |
| 194 | + block[scantable[0]] = offset + *dc_level * quant_matrix[0]; |
| 195 | + |
| 196 | + for (int i = 1; i < 64;) { |
| 197 | + if (*skip > 0) { |
| 198 | + int rskip; |
| 199 | + |
| 200 | + rskip = FFMIN(*skip, 64 - i); |
| 201 | + i += rskip; |
| 202 | + *skip -= rskip; |
| 203 | + } else { |
| 204 | + ret = read_code(gb, skip, &level, &map, s->flags & 1); |
| 205 | + if (ret < 0) |
| 206 | + return ret; |
| 207 | + |
| 208 | + block[scantable[i]] = level * quant_matrix[i]; |
| 209 | + i++; |
| 210 | + } |
| 211 | + } |
| 212 | + |
| 213 | + return 0; |
| 214 | +} |
| 215 | + |
| 216 | +static int decode_intra_plane(AGMContext *s, GetBitContext *gb, int size, |
| 217 | + const int *quant_matrix, AVFrame *frame, |
| 218 | + int plane) |
| 219 | +{ |
| 220 | + int ret, skip = 0, dc_level = 0; |
| 221 | + |
| 222 | + if ((ret = init_get_bits8(gb, s->gbyte.buffer, size)) < 0) |
| 223 | + return ret; |
| 224 | + |
| 225 | + for (int y = 0; y < s->blocks_h; y++) { |
| 226 | + for (int x = 0; x < s->blocks_w; x++) { |
| 227 | + ret = decode_intra_block(s, gb, size, quant_matrix, &skip, &dc_level); |
| 228 | + if (ret < 0) |
| 229 | + return ret; |
| 230 | + |
| 231 | + s->idsp.idct_put(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8, |
| 232 | + frame->linesize[plane], s->block); |
| 233 | + } |
| 234 | + } |
| 235 | + |
| 236 | + align_get_bits(gb); |
| 237 | + if (get_bits_left(gb) < 0) |
| 238 | + av_log(s->avctx, AV_LOG_WARNING, "overread\n"); |
| 239 | + if (get_bits_left(gb) > 0) |
| 240 | + av_log(s->avctx, AV_LOG_WARNING, "underread: %d\n", get_bits_left(gb)); |
| 241 | + |
| 242 | + return 0; |
| 243 | +} |
| 244 | + |
| 245 | +static int decode_inter_block(AGMContext *s, GetBitContext *gb, int size, |
| 246 | + const int *quant_matrix, int *skip, |
| 247 | + int *map) |
| 248 | +{ |
| 249 | + const uint8_t *scantable = s->scantable.permutated; |
| 250 | + int16_t *block = s->block; |
| 251 | + int level, ret; |
| 252 | + |
| 253 | + memset(block, 0, sizeof(s->block)); |
| 254 | + |
| 255 | + for (int i = 0; i < 64;) { |
| 256 | + if (*skip > 0) { |
| 257 | + int rskip; |
| 258 | + |
| 259 | + rskip = FFMIN(*skip, 64 - i); |
| 260 | + i += rskip; |
| 261 | + *skip -= rskip; |
| 262 | + } else { |
| 263 | + ret = read_code(gb, skip, &level, map, s->flags & 1); |
| 264 | + if (ret < 0) |
| 265 | + return ret; |
| 266 | + |
| 267 | + block[scantable[i]] = level * quant_matrix[i]; |
| 268 | + i++; |
| 269 | + } |
| 270 | + } |
| 271 | + |
| 272 | + return 0; |
| 273 | +} |
| 274 | + |
| 275 | +static int decode_inter_plane(AGMContext *s, GetBitContext *gb, int size, |
| 276 | + const int *quant_matrix, AVFrame *frame, |
| 277 | + AVFrame *prev, int plane) |
| 278 | +{ |
| 279 | + int ret, skip = 0; |
| 280 | + |
| 281 | + if ((ret = init_get_bits8(gb, s->gbyte.buffer, size)) < 0) |
| 282 | + return ret; |
| 283 | + |
| 284 | + if (s->flags & 2) { |
| 285 | + for (int y = 0; y < s->blocks_h; y++) { |
| 286 | + for (int x = 0; x < s->blocks_w; x++) { |
| 287 | + int shift = plane == 0; |
| 288 | + int mvpos = (y >> shift) * (s->blocks_w >> shift) + (x >> shift); |
| 289 | + int orig_mv_x = s->mvectors[mvpos].x; |
| 290 | + int mv_x = s->mvectors[mvpos].x / (1 + !shift); |
| 291 | + int mv_y = s->mvectors[mvpos].y / (1 + !shift); |
| 292 | + int h = s->avctx->coded_height >> !shift; |
| 293 | + int w = s->avctx->coded_width >> !shift; |
| 294 | + int map = 0; |
| 295 | + |
| 296 | + ret = decode_inter_block(s, gb, size, quant_matrix, &skip, &map); |
| 297 | + if (ret < 0) |
| 298 | + return ret; |
| 299 | + |
| 300 | + if (orig_mv_x >= -32) { |
| 301 | + if (y * 8 + mv_y < 0 || y * 8 + mv_y >= h || |
| 302 | + x * 8 + mv_x < 0 || x * 8 + mv_x >= w) |
| 303 | + return AVERROR_INVALIDDATA; |
| 304 | + |
| 305 | + copy_block8(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8, |
| 306 | + prev->data[plane] + ((s->blocks_h - 1 - y) * 8 - mv_y) * prev->linesize[plane] + (x * 8 + mv_x), |
| 307 | + frame->linesize[plane], prev->linesize[plane], 8); |
| 308 | + if (map) { |
| 309 | + s->idsp.idct(s->block); |
| 310 | + for (int i = 0; i < 64; i++) |
| 311 | + s->block[i] = (s->block[i] + 1) & 0xFFFC; |
| 312 | + s->idsp.add_pixels_clamped(s->block, frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8, |
| 313 | + frame->linesize[plane]); |
| 314 | + } |
| 315 | + } else if (map) { |
| 316 | + s->idsp.idct_put(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8, |
| 317 | + frame->linesize[plane], s->block); |
| 318 | + } |
| 319 | + } |
| 320 | + } |
| 321 | + } else { |
| 322 | + for (int y = 0; y < s->blocks_h; y++) { |
| 323 | + for (int x = 0; x < s->blocks_w; x++) { |
| 324 | + int map = 0; |
| 325 | + |
| 326 | + ret = decode_inter_block(s, gb, size, quant_matrix, &skip, &map); |
| 327 | + if (ret < 0) |
| 328 | + return ret; |
| 329 | + |
| 330 | + if (!map) |
| 331 | + continue; |
| 332 | + s->idsp.idct_add(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8, |
| 333 | + frame->linesize[plane], s->block); |
| 334 | + } |
| 335 | + } |
| 336 | + } |
| 337 | + |
| 338 | + align_get_bits(gb); |
| 339 | + if (get_bits_left(gb) < 0) |
| 340 | + av_log(s->avctx, AV_LOG_WARNING, "overread\n"); |
| 341 | + if (get_bits_left(gb) > 0) |
| 342 | + av_log(s->avctx, AV_LOG_WARNING, "underread: %d\n", get_bits_left(gb)); |
| 343 | + |
| 344 | + return 0; |
| 345 | +} |
| 346 | + |
| 347 | +static void compute_quant_matrix(AGMContext *s, double qscale) |
| 348 | +{ |
| 349 | + int luma[64], chroma[64]; |
| 350 | + double f = 1.0 - fabs(qscale); |
| 351 | + |
| 352 | + if (!s->key_frame && (s->flags & 2)) { |
| 353 | + if (qscale >= 0.0) { |
| 354 | + for (int i = 0; i < 64; i++) { |
| 355 | + luma[i] = FFMAX(1, 16 * f); |
| 356 | + chroma[i] = FFMAX(1, 16 * f); |
| 357 | + } |
| 358 | + } else { |
| 359 | + for (int i = 0; i < 64; i++) { |
| 360 | + luma[i] = FFMAX(1, 16 - qscale * 32); |
| 361 | + chroma[i] = FFMAX(1, 16 - qscale * 32); |
| 362 | + } |
| 363 | + } |
| 364 | + } else { |
| 365 | + if (qscale >= 0.0) { |
| 366 | + for (int i = 0; i < 64; i++) { |
| 367 | + luma[i] = FFMAX(1, unscaled_luma [(i & 7) * 8 + (i >> 3)] * f); |
| 368 | + chroma[i] = FFMAX(1, unscaled_chroma[(i & 7) * 8 + (i >> 3)] * f); |
| 369 | + } |
| 370 | + } else { |
| 371 | + for (int i = 0; i < 64; i++) { |
| 372 | + luma[i] = FFMAX(1, 255.0 - (255 - unscaled_luma [(i & 7) * 8 + (i >> 3)]) * f); |
| 373 | + chroma[i] = FFMAX(1, 255.0 - (255 - unscaled_chroma[(i & 7) * 8 + (i >> 3)]) * f); |
| 374 | + } |
| 375 | + } |
| 376 | + } |
| 377 | + |
| 378 | + for (int i = 0; i < 64; i++) { |
| 379 | + int pos = ff_zigzag_direct[i]; |
| 380 | + |
| 381 | + s->luma_quant_matrix[i] = luma[pos] * ((pos / 8) & 1 ? -1 : 1); |
| 382 | + s->chroma_quant_matrix[i] = chroma[pos] * ((pos / 8) & 1 ? -1 : 1); |
| 383 | + } |
| 384 | +} |
| 385 | + |
| 386 | +static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame) |
| 387 | +{ |
| 388 | + AGMContext *s = avctx->priv_data; |
| 389 | + int ret; |
| 390 | + |
| 391 | + compute_quant_matrix(s, (2 * s->compression - 100) / 100.0); |
| 392 | + |
| 393 | + s->blocks_w = avctx->coded_width >> 3; |
| 394 | + s->blocks_h = avctx->coded_height >> 3; |
| 395 | + |
| 396 | + ret = decode_intra_plane(s, gb, s->size[0], s->luma_quant_matrix, frame, 0); |
| 397 | + if (ret < 0) |
| 398 | + return ret; |
| 399 | + |
| 400 | + bytestream2_skip(&s->gbyte, s->size[0]); |
| 401 | + |
| 402 | + s->blocks_w = avctx->coded_width >> 4; |
| 403 | + s->blocks_h = avctx->coded_height >> 4; |
| 404 | + |
| 405 | + ret = decode_intra_plane(s, gb, s->size[1], s->chroma_quant_matrix, frame, 2); |
| 406 | + if (ret < 0) |
| 407 | + return ret; |
| 408 | + |
| 409 | + bytestream2_skip(&s->gbyte, s->size[1]); |
| 410 | + |
| 411 | + s->blocks_w = avctx->coded_width >> 4; |
| 412 | + s->blocks_h = avctx->coded_height >> 4; |
| 413 | + |
| 414 | + ret = decode_intra_plane(s, gb, s->size[2], s->chroma_quant_matrix, frame, 1); |
| 415 | + if (ret < 0) |
| 416 | + return ret; |
| 417 | + |
| 418 | + return 0; |
| 419 | +} |
| 420 | + |
| 421 | +static int decode_motion_vectors(AVCodecContext *avctx, GetBitContext *gb) |
| 422 | +{ |
| 423 | + AGMContext *s = avctx->priv_data; |
| 424 | + int nb_mvs = ((avctx->height + 15) >> 4) * ((avctx->width + 15) >> 4); |
| 425 | + int ret, skip = 0, value, map; |
| 426 | + |
| 427 | + av_fast_padded_malloc(&s->mvectors, &s->mvectors_size, |
| 428 | + nb_mvs * sizeof(*s->mvectors)); |
| 429 | + if (!s->mvectors) |
| 430 | + return AVERROR(ENOMEM); |
| 431 | + |
| 432 | + if ((ret = init_get_bits8(gb, s->gbyte.buffer, bytestream2_get_bytes_left(&s->gbyte) - |
| 433 | + (s->size[0] + s->size[1] + s->size[2]))) < 0) |
| 434 | + return ret; |
| 435 | + |
| 436 | + memset(s->mvectors, 0, sizeof(*s->mvectors) * nb_mvs); |
| 437 | + |
| 438 | + for (int i = 0; i < nb_mvs; i++) { |
| 439 | + ret = read_code(gb, &skip, &value, &map, 1); |
| 440 | + if (ret < 0) |
| 441 | + return ret; |
| 442 | + s->mvectors[i].x = value; |
| 443 | + i += skip; |
| 444 | + } |
| 445 | + |
| 446 | + for (int i = 0; i < nb_mvs; i++) { |
| 447 | + ret = read_code(gb, &skip, &value, &map, 1); |
| 448 | + if (ret < 0) |
| 449 | + return ret; |
| 450 | + s->mvectors[i].y = value; |
| 451 | + i += skip; |
| 452 | + } |
| 453 | + |
| 454 | + if (get_bits_left(gb) <= 0) |
| 455 | + return AVERROR_INVALIDDATA; |
| 456 | + skip = (get_bits_count(gb) >> 3) + 1; |
| 457 | + bytestream2_skip(&s->gbyte, skip); |
| 458 | + |
| 459 | + return 0; |
| 460 | +} |
| 461 | + |
| 462 | +static int decode_inter(AVCodecContext *avctx, GetBitContext *gb, |
| 463 | + AVFrame *frame, AVFrame *prev) |
| 464 | +{ |
| 465 | + AGMContext *s = avctx->priv_data; |
| 466 | + int ret; |
| 467 | + |
| 468 | + compute_quant_matrix(s, (2 * s->compression - 100) / 100.0); |
| 469 | + |
| 470 | + if (s->flags & 2) { |
| 471 | + ret = decode_motion_vectors(avctx, gb); |
| 472 | + if (ret < 0) |
| 473 | + return ret; |
| 474 | + } |
| 475 | + |
| 476 | + s->blocks_w = avctx->coded_width >> 3; |
| 477 | + s->blocks_h = avctx->coded_height >> 3; |
| 478 | + |
| 479 | + ret = decode_inter_plane(s, gb, s->size[0], s->luma_quant_matrix, frame, prev, 0); |
| 480 | + if (ret < 0) |
| 481 | + return ret; |
| 482 | + |
| 483 | + bytestream2_skip(&s->gbyte, s->size[0]); |
| 484 | + |
| 485 | + s->blocks_w = avctx->coded_width >> 4; |
| 486 | + s->blocks_h = avctx->coded_height >> 4; |
| 487 | + |
| 488 | + ret = decode_inter_plane(s, gb, s->size[1], s->chroma_quant_matrix, frame, prev, 2); |
| 489 | + if (ret < 0) |
| 490 | + return ret; |
| 491 | + |
| 492 | + bytestream2_skip(&s->gbyte, s->size[1]); |
| 493 | + |
| 494 | + s->blocks_w = avctx->coded_width >> 4; |
| 495 | + s->blocks_h = avctx->coded_height >> 4; |
| 496 | + |
| 497 | + ret = decode_inter_plane(s, gb, s->size[2], s->chroma_quant_matrix, frame, prev, 1); |
| 498 | + if (ret < 0) |
| 499 | + return ret; |
| 500 | + |
| 501 | + return 0; |
| 502 | +} |
| 503 | + |
| 504 | +static int decode_frame(AVCodecContext *avctx, void *data, |
| 505 | + int *got_frame, AVPacket *avpkt) |
| 506 | +{ |
| 507 | + AGMContext *s = avctx->priv_data; |
| 508 | + GetBitContext *gb = &s->gb; |
| 509 | + GetByteContext *gbyte = &s->gbyte; |
| 510 | + AVFrame *frame = data; |
| 511 | + int w, h, width, height, header; |
| 512 | + int ret; |
| 513 | + |
| 514 | + if (!avpkt->size) |
| 515 | + return 0; |
| 516 | + |
| 517 | + bytestream2_init(gbyte, avpkt->data, avpkt->size); |
| 518 | + |
| 519 | + header = bytestream2_get_le32(gbyte); |
| 520 | + s->fflags = bytestream2_get_le32(gbyte); |
| 521 | + s->bitstream_size = s->fflags & 0x1FFFFFFF; |
| 522 | + s->fflags >>= 29; |
| 523 | + av_log(avctx, AV_LOG_DEBUG, "fflags: %X\n", s->fflags); |
| 524 | + if (avpkt->size < s->bitstream_size + 8) |
| 525 | + return AVERROR_INVALIDDATA; |
| 526 | + |
| 527 | + s->key_frame = s->fflags & 0x1; |
| 528 | + frame->key_frame = s->key_frame; |
| 529 | + frame->pict_type = s->key_frame ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; |
| 530 | + |
| 531 | + if (header) { |
| 532 | + av_log(avctx, AV_LOG_ERROR, "header: %X\n", header); |
| 533 | + return AVERROR_PATCHWELCOME; |
| 534 | + } |
| 535 | + |
| 536 | + s->flags = 0; |
| 537 | + w = bytestream2_get_le32(gbyte); |
| 538 | + if (w < 0) { |
| 539 | + w = -w; |
| 540 | + s->flags |= 2; |
| 541 | + } |
| 542 | + h = bytestream2_get_le32(gbyte); |
| 543 | + if (h < 0) { |
| 544 | + h = -h; |
| 545 | + s->flags |= 1; |
| 546 | + } |
| 547 | + |
| 548 | + width = avctx->width; |
| 549 | + height = avctx->height; |
| 550 | + if (w < width || h < height || w & 7 || h & 7) |
| 551 | + return AVERROR_INVALIDDATA; |
| 552 | + |
| 553 | + ret = ff_set_dimensions(avctx, w, h); |
| 554 | + if (ret < 0) |
| 555 | + return ret; |
| 556 | + avctx->width = width; |
| 557 | + avctx->height = height; |
| 558 | + |
| 559 | + s->compression = bytestream2_get_le32(gbyte); |
| 560 | + if (s->compression < 0 || s->compression > 100) |
| 561 | + return AVERROR_INVALIDDATA; |
| 562 | + |
| 563 | + for (int i = 0; i < 3; i++) |
| 564 | + s->size[i] = bytestream2_get_le32(gbyte); |
| 565 | + if (32LL + s->size[0] + s->size[1] + s->size[2] > avpkt->size) |
| 566 | + return AVERROR_INVALIDDATA; |
| 567 | + |
| 568 | + if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) |
| 569 | + return ret; |
| 570 | + |
| 571 | + if (frame->key_frame) { |
| 572 | + ret = decode_intra(avctx, gb, frame); |
| 573 | + } else { |
| 574 | + if (!s->prev_frame->data[0]) { |
| 575 | + av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n"); |
| 576 | + return AVERROR_INVALIDDATA; |
| 577 | + } |
| 578 | + |
| 579 | + if (!(s->flags & 2)) { |
| 580 | + ret = av_frame_copy(frame, s->prev_frame); |
| 581 | + if (ret < 0) |
| 582 | + return ret; |
| 583 | + } |
| 584 | + |
| 585 | + ret = decode_inter(avctx, gb, frame, s->prev_frame); |
| 586 | + } |
| 587 | + if (ret < 0) |
| 588 | + return ret; |
| 589 | + |
| 590 | + av_frame_unref(s->prev_frame); |
| 591 | + if ((ret = av_frame_ref(s->prev_frame, frame)) < 0) |
| 592 | + return ret; |
| 593 | + |
| 594 | + frame->crop_top = avctx->coded_height - avctx->height; |
| 595 | + frame->crop_left = avctx->coded_width - avctx->width; |
| 596 | + |
| 597 | + *got_frame = 1; |
| 598 | + |
| 599 | + return avpkt->size; |
| 600 | +} |
| 601 | + |
| 602 | +static av_cold int decode_init(AVCodecContext *avctx) |
| 603 | +{ |
| 604 | + AGMContext *s = avctx->priv_data; |
| 605 | + |
| 606 | + avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| 607 | + s->avctx = avctx; |
| 608 | + s->plus = avctx->codec_tag == MKTAG('A', 'G', 'M', '3'); |
| 609 | + |
| 610 | + avctx->idct_algo = FF_IDCT_SIMPLE; |
| 611 | + ff_idctdsp_init(&s->idsp, avctx); |
| 612 | + ff_init_scantable(s->idsp.idct_permutation, &s->scantable, ff_zigzag_direct); |
| 613 | + |
| 614 | + s->prev_frame = av_frame_alloc(); |
| 615 | + if (!s->prev_frame) |
| 616 | + return AVERROR(ENOMEM); |
| 617 | + |
| 618 | + return 0; |
| 619 | +} |
| 620 | + |
| 621 | +static void decode_flush(AVCodecContext *avctx) |
| 622 | +{ |
| 623 | + AGMContext *s = avctx->priv_data; |
| 624 | + |
| 625 | + av_frame_unref(s->prev_frame); |
| 626 | +} |
| 627 | + |
| 628 | +static av_cold int decode_close(AVCodecContext *avctx) |
| 629 | +{ |
| 630 | + AGMContext *s = avctx->priv_data; |
| 631 | + |
| 632 | + av_frame_free(&s->prev_frame); |
| 633 | + av_freep(&s->mvectors); |
| 634 | + s->mvectors_size = 0; |
| 635 | + |
| 636 | + return 0; |
| 637 | +} |
| 638 | + |
| 639 | +AVCodec ff_agm_decoder = { |
| 640 | + .name = "agm", |
| 641 | + .long_name = NULL_IF_CONFIG_SMALL("Amuse Graphics Movie"), |
| 642 | + .type = AVMEDIA_TYPE_VIDEO, |
| 643 | + .id = AV_CODEC_ID_AGM, |
| 644 | + .priv_data_size = sizeof(AGMContext), |
| 645 | + .init = decode_init, |
| 646 | + .close = decode_close, |
| 647 | + .decode = decode_frame, |
| 648 | + .flush = decode_flush, |
| 649 | + .capabilities = AV_CODEC_CAP_DR1, |
| 650 | + .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | |
| 651 | + FF_CODEC_CAP_INIT_CLEANUP | |
| 652 | + FF_CODEC_CAP_EXPORTS_CROPPING, |
| 653 | +}; |