| 1 | /* |
| 2 | * Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 6 | * FFmpeg is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * FFmpeg is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with FFmpeg; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | /** |
| 22 | * @file |
| 23 | * Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder |
| 24 | */ |
| 25 | |
| 26 | #include "libavutil/avassert.h" |
| 27 | #include "error_resilience.h" |
| 28 | #include "internal.h" |
| 29 | #include "mpeg_er.h" |
| 30 | #include "msmpeg4data.h" |
| 31 | #include "qpeldsp.h" |
| 32 | #include "vc1.h" |
| 33 | #include "mss12.h" |
| 34 | #include "mss2dsp.h" |
| 35 | |
| 36 | typedef struct MSS2Context { |
| 37 | VC1Context v; |
| 38 | int split_position; |
| 39 | AVFrame *last_pic; |
| 40 | MSS12Context c; |
| 41 | MSS2DSPContext dsp; |
| 42 | QpelDSPContext qdsp; |
| 43 | SliceContext sc[2]; |
| 44 | } MSS2Context; |
| 45 | |
| 46 | static void arith2_normalise(ArithCoder *c) |
| 47 | { |
| 48 | while ((c->high >> 15) - (c->low >> 15) < 2) { |
| 49 | if ((c->low ^ c->high) & 0x10000) { |
| 50 | c->high ^= 0x8000; |
| 51 | c->value ^= 0x8000; |
| 52 | c->low ^= 0x8000; |
| 53 | } |
| 54 | c->high = c->high << 8 & 0xFFFFFF | 0xFF; |
| 55 | c->value = c->value << 8 & 0xFFFFFF | bytestream2_get_byte(c->gbc.gB); |
| 56 | c->low = c->low << 8 & 0xFFFFFF; |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | ARITH_GET_BIT(arith2) |
| 61 | |
| 62 | /* L. Stuiver and A. Moffat: "Piecewise Integer Mapping for Arithmetic Coding." |
| 63 | * In Proc. 8th Data Compression Conference (DCC '98), pp. 3-12, Mar. 1998 */ |
| 64 | |
| 65 | static int arith2_get_scaled_value(int value, int n, int range) |
| 66 | { |
| 67 | int split = (n << 1) - range; |
| 68 | |
| 69 | if (value > split) |
| 70 | return split + (value - split >> 1); |
| 71 | else |
| 72 | return value; |
| 73 | } |
| 74 | |
| 75 | static void arith2_rescale_interval(ArithCoder *c, int range, |
| 76 | int low, int high, int n) |
| 77 | { |
| 78 | int split = (n << 1) - range; |
| 79 | |
| 80 | if (high > split) |
| 81 | c->high = split + (high - split << 1); |
| 82 | else |
| 83 | c->high = high; |
| 84 | |
| 85 | c->high += c->low - 1; |
| 86 | |
| 87 | if (low > split) |
| 88 | c->low += split + (low - split << 1); |
| 89 | else |
| 90 | c->low += low; |
| 91 | } |
| 92 | |
| 93 | static int arith2_get_number(ArithCoder *c, int n) |
| 94 | { |
| 95 | int range = c->high - c->low + 1; |
| 96 | int scale = av_log2(range) - av_log2(n); |
| 97 | int val; |
| 98 | |
| 99 | if (n << scale > range) |
| 100 | scale--; |
| 101 | |
| 102 | n <<= scale; |
| 103 | |
| 104 | val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale; |
| 105 | |
| 106 | arith2_rescale_interval(c, range, val << scale, (val + 1) << scale, n); |
| 107 | |
| 108 | arith2_normalise(c); |
| 109 | |
| 110 | return val; |
| 111 | } |
| 112 | |
| 113 | static int arith2_get_prob(ArithCoder *c, int16_t *probs) |
| 114 | { |
| 115 | int range = c->high - c->low + 1, n = *probs; |
| 116 | int scale = av_log2(range) - av_log2(n); |
| 117 | int i = 0, val; |
| 118 | |
| 119 | if (n << scale > range) |
| 120 | scale--; |
| 121 | |
| 122 | n <<= scale; |
| 123 | |
| 124 | val = arith2_get_scaled_value(c->value - c->low, n, range) >> scale; |
| 125 | while (probs[++i] > val) ; |
| 126 | |
| 127 | arith2_rescale_interval(c, range, |
| 128 | probs[i] << scale, probs[i - 1] << scale, n); |
| 129 | |
| 130 | return i; |
| 131 | } |
| 132 | |
| 133 | ARITH_GET_MODEL_SYM(arith2) |
| 134 | |
| 135 | static int arith2_get_consumed_bytes(ArithCoder *c) |
| 136 | { |
| 137 | int diff = (c->high >> 16) - (c->low >> 16); |
| 138 | int bp = bytestream2_tell(c->gbc.gB) - 3 << 3; |
| 139 | int bits = 1; |
| 140 | |
| 141 | while (!(diff & 0x80)) { |
| 142 | bits++; |
| 143 | diff <<= 1; |
| 144 | } |
| 145 | |
| 146 | return (bits + bp + 7 >> 3) + ((c->low >> 16) + 1 == c->high >> 16); |
| 147 | } |
| 148 | |
| 149 | static void arith2_init(ArithCoder *c, GetByteContext *gB) |
| 150 | { |
| 151 | c->low = 0; |
| 152 | c->high = 0xFFFFFF; |
| 153 | c->value = bytestream2_get_be24(gB); |
| 154 | c->gbc.gB = gB; |
| 155 | c->get_model_sym = arith2_get_model_sym; |
| 156 | c->get_number = arith2_get_number; |
| 157 | } |
| 158 | |
| 159 | static int decode_pal_v2(MSS12Context *ctx, const uint8_t *buf, int buf_size) |
| 160 | { |
| 161 | int i, ncol; |
| 162 | uint32_t *pal = ctx->pal + 256 - ctx->free_colours; |
| 163 | |
| 164 | if (!ctx->free_colours) |
| 165 | return 0; |
| 166 | |
| 167 | ncol = *buf++; |
| 168 | if (ncol > ctx->free_colours || buf_size < 2 + ncol * 3) |
| 169 | return AVERROR_INVALIDDATA; |
| 170 | for (i = 0; i < ncol; i++) |
| 171 | *pal++ = AV_RB24(buf + 3 * i); |
| 172 | |
| 173 | return 1 + ncol * 3; |
| 174 | } |
| 175 | |
| 176 | static int decode_555(GetByteContext *gB, uint16_t *dst, int stride, |
| 177 | int keyframe, int w, int h) |
| 178 | { |
| 179 | int last_symbol = 0, repeat = 0, prev_avail = 0; |
| 180 | |
| 181 | if (!keyframe) { |
| 182 | int x, y, endx, endy, t; |
| 183 | |
| 184 | #define READ_PAIR(a, b) \ |
| 185 | a = bytestream2_get_byte(gB) << 4; \ |
| 186 | t = bytestream2_get_byte(gB); \ |
| 187 | a |= t >> 4; \ |
| 188 | b = (t & 0xF) << 8; \ |
| 189 | b |= bytestream2_get_byte(gB); \ |
| 190 | |
| 191 | READ_PAIR(x, endx) |
| 192 | READ_PAIR(y, endy) |
| 193 | |
| 194 | if (endx >= w || endy >= h || x > endx || y > endy) |
| 195 | return AVERROR_INVALIDDATA; |
| 196 | dst += x + stride * y; |
| 197 | w = endx - x + 1; |
| 198 | h = endy - y + 1; |
| 199 | if (y) |
| 200 | prev_avail = 1; |
| 201 | } |
| 202 | |
| 203 | do { |
| 204 | uint16_t *p = dst; |
| 205 | do { |
| 206 | if (repeat-- < 1) { |
| 207 | int b = bytestream2_get_byte(gB); |
| 208 | if (b < 128) |
| 209 | last_symbol = b << 8 | bytestream2_get_byte(gB); |
| 210 | else if (b > 129) { |
| 211 | repeat = 0; |
| 212 | while (b-- > 130) |
| 213 | repeat = (repeat << 8) + bytestream2_get_byte(gB) + 1; |
| 214 | if (last_symbol == -2) { |
| 215 | int skip = FFMIN((unsigned)repeat, dst + w - p); |
| 216 | repeat -= skip; |
| 217 | p += skip; |
| 218 | } |
| 219 | } else |
| 220 | last_symbol = 127 - b; |
| 221 | } |
| 222 | if (last_symbol >= 0) |
| 223 | *p = last_symbol; |
| 224 | else if (last_symbol == -1 && prev_avail) |
| 225 | *p = *(p - stride); |
| 226 | } while (++p < dst + w); |
| 227 | dst += stride; |
| 228 | prev_avail = 1; |
| 229 | } while (--h); |
| 230 | |
| 231 | return 0; |
| 232 | } |
| 233 | |
| 234 | static int decode_rle(GetBitContext *gb, uint8_t *pal_dst, int pal_stride, |
| 235 | uint8_t *rgb_dst, int rgb_stride, uint32_t *pal, |
| 236 | int keyframe, int kf_slipt, int slice, int w, int h) |
| 237 | { |
| 238 | uint8_t bits[270] = { 0 }; |
| 239 | uint32_t codes[270]; |
| 240 | VLC vlc; |
| 241 | |
| 242 | int current_length = 0, read_codes = 0, next_code = 0, current_codes = 0; |
| 243 | int remaining_codes, surplus_codes, i; |
| 244 | |
| 245 | const int alphabet_size = 270 - keyframe; |
| 246 | |
| 247 | int last_symbol = 0, repeat = 0, prev_avail = 0; |
| 248 | |
| 249 | if (!keyframe) { |
| 250 | int x, y, clipw, cliph; |
| 251 | |
| 252 | x = get_bits(gb, 12); |
| 253 | y = get_bits(gb, 12); |
| 254 | clipw = get_bits(gb, 12) + 1; |
| 255 | cliph = get_bits(gb, 12) + 1; |
| 256 | |
| 257 | if (x + clipw > w || y + cliph > h) |
| 258 | return AVERROR_INVALIDDATA; |
| 259 | pal_dst += pal_stride * y + x; |
| 260 | rgb_dst += rgb_stride * y + x * 3; |
| 261 | w = clipw; |
| 262 | h = cliph; |
| 263 | if (y) |
| 264 | prev_avail = 1; |
| 265 | } else { |
| 266 | if (slice > 0) { |
| 267 | pal_dst += pal_stride * kf_slipt; |
| 268 | rgb_dst += rgb_stride * kf_slipt; |
| 269 | prev_avail = 1; |
| 270 | h -= kf_slipt; |
| 271 | } else |
| 272 | h = kf_slipt; |
| 273 | } |
| 274 | |
| 275 | /* read explicit codes */ |
| 276 | do { |
| 277 | while (current_codes--) { |
| 278 | int symbol = get_bits(gb, 8); |
| 279 | if (symbol >= 204 - keyframe) |
| 280 | symbol += 14 - keyframe; |
| 281 | else if (symbol > 189) |
| 282 | symbol = get_bits1(gb) + (symbol << 1) - 190; |
| 283 | if (bits[symbol]) |
| 284 | return AVERROR_INVALIDDATA; |
| 285 | bits[symbol] = current_length; |
| 286 | codes[symbol] = next_code++; |
| 287 | read_codes++; |
| 288 | } |
| 289 | current_length++; |
| 290 | next_code <<= 1; |
| 291 | remaining_codes = (1 << current_length) - next_code; |
| 292 | current_codes = get_bits(gb, av_ceil_log2(remaining_codes + 1)); |
| 293 | if (current_length > 22 || current_codes > remaining_codes) |
| 294 | return AVERROR_INVALIDDATA; |
| 295 | } while (current_codes != remaining_codes); |
| 296 | |
| 297 | remaining_codes = alphabet_size - read_codes; |
| 298 | |
| 299 | /* determine the minimum length to fit the rest of the alphabet */ |
| 300 | while ((surplus_codes = (2 << current_length) - |
| 301 | (next_code << 1) - remaining_codes) < 0) { |
| 302 | current_length++; |
| 303 | next_code <<= 1; |
| 304 | } |
| 305 | |
| 306 | /* add the rest of the symbols lexicographically */ |
| 307 | for (i = 0; i < alphabet_size; i++) |
| 308 | if (!bits[i]) { |
| 309 | if (surplus_codes-- == 0) { |
| 310 | current_length++; |
| 311 | next_code <<= 1; |
| 312 | } |
| 313 | bits[i] = current_length; |
| 314 | codes[i] = next_code++; |
| 315 | } |
| 316 | |
| 317 | if (next_code != 1 << current_length) |
| 318 | return AVERROR_INVALIDDATA; |
| 319 | |
| 320 | if (i = init_vlc(&vlc, 9, alphabet_size, bits, 1, 1, codes, 4, 4, 0)) |
| 321 | return i; |
| 322 | |
| 323 | /* frame decode */ |
| 324 | do { |
| 325 | uint8_t *pp = pal_dst; |
| 326 | uint8_t *rp = rgb_dst; |
| 327 | do { |
| 328 | if (repeat-- < 1) { |
| 329 | int b = get_vlc2(gb, vlc.table, 9, 3); |
| 330 | if (b < 256) |
| 331 | last_symbol = b; |
| 332 | else if (b < 268) { |
| 333 | b -= 256; |
| 334 | if (b == 11) |
| 335 | b = get_bits(gb, 4) + 10; |
| 336 | |
| 337 | if (!b) |
| 338 | repeat = 0; |
| 339 | else |
| 340 | repeat = get_bits(gb, b); |
| 341 | |
| 342 | repeat += (1 << b) - 1; |
| 343 | |
| 344 | if (last_symbol == -2) { |
| 345 | int skip = FFMIN(repeat, pal_dst + w - pp); |
| 346 | repeat -= skip; |
| 347 | pp += skip; |
| 348 | rp += skip * 3; |
| 349 | } |
| 350 | } else |
| 351 | last_symbol = 267 - b; |
| 352 | } |
| 353 | if (last_symbol >= 0) { |
| 354 | *pp = last_symbol; |
| 355 | AV_WB24(rp, pal[last_symbol]); |
| 356 | } else if (last_symbol == -1 && prev_avail) { |
| 357 | *pp = *(pp - pal_stride); |
| 358 | memcpy(rp, rp - rgb_stride, 3); |
| 359 | } |
| 360 | rp += 3; |
| 361 | } while (++pp < pal_dst + w); |
| 362 | pal_dst += pal_stride; |
| 363 | rgb_dst += rgb_stride; |
| 364 | prev_avail = 1; |
| 365 | } while (--h); |
| 366 | |
| 367 | ff_free_vlc(&vlc); |
| 368 | return 0; |
| 369 | } |
| 370 | |
| 371 | static int decode_wmv9(AVCodecContext *avctx, const uint8_t *buf, int buf_size, |
| 372 | int x, int y, int w, int h, int wmv9_mask) |
| 373 | { |
| 374 | MSS2Context *ctx = avctx->priv_data; |
| 375 | MSS12Context *c = &ctx->c; |
| 376 | VC1Context *v = avctx->priv_data; |
| 377 | MpegEncContext *s = &v->s; |
| 378 | AVFrame *f; |
| 379 | int ret; |
| 380 | |
| 381 | ff_mpeg_flush(avctx); |
| 382 | |
| 383 | if ((ret = init_get_bits8(&s->gb, buf, buf_size)) < 0) |
| 384 | return ret; |
| 385 | |
| 386 | s->loop_filter = avctx->skip_loop_filter < AVDISCARD_ALL; |
| 387 | |
| 388 | if (ff_vc1_parse_frame_header(v, &s->gb) < 0) { |
| 389 | av_log(v->s.avctx, AV_LOG_ERROR, "header error\n"); |
| 390 | return AVERROR_INVALIDDATA; |
| 391 | } |
| 392 | |
| 393 | if (s->pict_type != AV_PICTURE_TYPE_I) { |
| 394 | av_log(v->s.avctx, AV_LOG_ERROR, "expected I-frame\n"); |
| 395 | return AVERROR_INVALIDDATA; |
| 396 | } |
| 397 | |
| 398 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
| 399 | |
| 400 | if ((ret = ff_mpv_frame_start(s, avctx)) < 0) { |
| 401 | av_log(v->s.avctx, AV_LOG_ERROR, "ff_mpv_frame_start error\n"); |
| 402 | avctx->pix_fmt = AV_PIX_FMT_RGB24; |
| 403 | return ret; |
| 404 | } |
| 405 | |
| 406 | ff_mpeg_er_frame_start(s); |
| 407 | |
| 408 | v->bits = buf_size * 8; |
| 409 | |
| 410 | v->end_mb_x = (w + 15) >> 4; |
| 411 | s->end_mb_y = (h + 15) >> 4; |
| 412 | if (v->respic & 1) |
| 413 | v->end_mb_x = v->end_mb_x + 1 >> 1; |
| 414 | if (v->respic & 2) |
| 415 | s->end_mb_y = s->end_mb_y + 1 >> 1; |
| 416 | |
| 417 | ff_vc1_decode_blocks(v); |
| 418 | |
| 419 | ff_er_frame_end(&s->er); |
| 420 | |
| 421 | ff_mpv_frame_end(s); |
| 422 | |
| 423 | f = s->current_picture.f; |
| 424 | |
| 425 | if (v->respic == 3) { |
| 426 | ctx->dsp.upsample_plane(f->data[0], f->linesize[0], w, h); |
| 427 | ctx->dsp.upsample_plane(f->data[1], f->linesize[1], w+1 >> 1, h+1 >> 1); |
| 428 | ctx->dsp.upsample_plane(f->data[2], f->linesize[2], w+1 >> 1, h+1 >> 1); |
| 429 | } else if (v->respic) |
| 430 | avpriv_request_sample(v->s.avctx, |
| 431 | "Asymmetric WMV9 rectangle subsampling"); |
| 432 | |
| 433 | av_assert0(f->linesize[1] == f->linesize[2]); |
| 434 | |
| 435 | if (wmv9_mask != -1) |
| 436 | ctx->dsp.mss2_blit_wmv9_masked(c->rgb_pic + y * c->rgb_stride + x * 3, |
| 437 | c->rgb_stride, wmv9_mask, |
| 438 | c->pal_pic + y * c->pal_stride + x, |
| 439 | c->pal_stride, |
| 440 | f->data[0], f->linesize[0], |
| 441 | f->data[1], f->data[2], f->linesize[1], |
| 442 | w, h); |
| 443 | else |
| 444 | ctx->dsp.mss2_blit_wmv9(c->rgb_pic + y * c->rgb_stride + x * 3, |
| 445 | c->rgb_stride, |
| 446 | f->data[0], f->linesize[0], |
| 447 | f->data[1], f->data[2], f->linesize[1], |
| 448 | w, h); |
| 449 | |
| 450 | avctx->pix_fmt = AV_PIX_FMT_RGB24; |
| 451 | |
| 452 | return 0; |
| 453 | } |
| 454 | |
| 455 | typedef struct Rectangle { |
| 456 | int coded, x, y, w, h; |
| 457 | } Rectangle; |
| 458 | |
| 459 | #define MAX_WMV9_RECTANGLES 20 |
| 460 | #define ARITH2_PADDING 2 |
| 461 | |
| 462 | static int mss2_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
| 463 | AVPacket *avpkt) |
| 464 | { |
| 465 | const uint8_t *buf = avpkt->data; |
| 466 | int buf_size = avpkt->size; |
| 467 | MSS2Context *ctx = avctx->priv_data; |
| 468 | MSS12Context *c = &ctx->c; |
| 469 | AVFrame *frame = data; |
| 470 | GetBitContext gb; |
| 471 | GetByteContext gB; |
| 472 | ArithCoder acoder; |
| 473 | |
| 474 | int keyframe, has_wmv9, has_mv, is_rle, is_555, ret; |
| 475 | |
| 476 | Rectangle wmv9rects[MAX_WMV9_RECTANGLES], *r; |
| 477 | int used_rects = 0, i, implicit_rect = 0, av_uninit(wmv9_mask); |
| 478 | |
| 479 | av_assert0(FF_INPUT_BUFFER_PADDING_SIZE >= |
| 480 | ARITH2_PADDING + (MIN_CACHE_BITS + 7) / 8); |
| 481 | |
| 482 | if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0) |
| 483 | return ret; |
| 484 | |
| 485 | if (keyframe = get_bits1(&gb)) |
| 486 | skip_bits(&gb, 7); |
| 487 | has_wmv9 = get_bits1(&gb); |
| 488 | has_mv = keyframe ? 0 : get_bits1(&gb); |
| 489 | is_rle = get_bits1(&gb); |
| 490 | is_555 = is_rle && get_bits1(&gb); |
| 491 | if (c->slice_split > 0) |
| 492 | ctx->split_position = c->slice_split; |
| 493 | else if (c->slice_split < 0) { |
| 494 | if (get_bits1(&gb)) { |
| 495 | if (get_bits1(&gb)) { |
| 496 | if (get_bits1(&gb)) |
| 497 | ctx->split_position = get_bits(&gb, 16); |
| 498 | else |
| 499 | ctx->split_position = get_bits(&gb, 12); |
| 500 | } else |
| 501 | ctx->split_position = get_bits(&gb, 8) << 4; |
| 502 | } else { |
| 503 | if (keyframe) |
| 504 | ctx->split_position = avctx->height / 2; |
| 505 | } |
| 506 | } else |
| 507 | ctx->split_position = avctx->height; |
| 508 | |
| 509 | if (c->slice_split && (ctx->split_position < 1 - is_555 || |
| 510 | ctx->split_position > avctx->height - 1)) |
| 511 | return AVERROR_INVALIDDATA; |
| 512 | |
| 513 | align_get_bits(&gb); |
| 514 | buf += get_bits_count(&gb) >> 3; |
| 515 | buf_size -= get_bits_count(&gb) >> 3; |
| 516 | |
| 517 | if (buf_size < 1) |
| 518 | return AVERROR_INVALIDDATA; |
| 519 | |
| 520 | if (is_555 && (has_wmv9 || has_mv || c->slice_split && ctx->split_position)) |
| 521 | return AVERROR_INVALIDDATA; |
| 522 | |
| 523 | avctx->pix_fmt = is_555 ? AV_PIX_FMT_RGB555 : AV_PIX_FMT_RGB24; |
| 524 | if (ctx->last_pic->format != avctx->pix_fmt) |
| 525 | av_frame_unref(ctx->last_pic); |
| 526 | |
| 527 | if (has_wmv9) { |
| 528 | bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING); |
| 529 | arith2_init(&acoder, &gB); |
| 530 | |
| 531 | implicit_rect = !arith2_get_bit(&acoder); |
| 532 | |
| 533 | while (arith2_get_bit(&acoder)) { |
| 534 | if (used_rects == MAX_WMV9_RECTANGLES) |
| 535 | return AVERROR_INVALIDDATA; |
| 536 | r = &wmv9rects[used_rects]; |
| 537 | if (!used_rects) |
| 538 | r->x = arith2_get_number(&acoder, avctx->width); |
| 539 | else |
| 540 | r->x = arith2_get_number(&acoder, avctx->width - |
| 541 | wmv9rects[used_rects - 1].x) + |
| 542 | wmv9rects[used_rects - 1].x; |
| 543 | r->y = arith2_get_number(&acoder, avctx->height); |
| 544 | r->w = arith2_get_number(&acoder, avctx->width - r->x) + 1; |
| 545 | r->h = arith2_get_number(&acoder, avctx->height - r->y) + 1; |
| 546 | used_rects++; |
| 547 | } |
| 548 | |
| 549 | if (implicit_rect && used_rects) { |
| 550 | av_log(avctx, AV_LOG_ERROR, "implicit_rect && used_rects > 0\n"); |
| 551 | return AVERROR_INVALIDDATA; |
| 552 | } |
| 553 | |
| 554 | if (implicit_rect) { |
| 555 | wmv9rects[0].x = 0; |
| 556 | wmv9rects[0].y = 0; |
| 557 | wmv9rects[0].w = avctx->width; |
| 558 | wmv9rects[0].h = avctx->height; |
| 559 | |
| 560 | used_rects = 1; |
| 561 | } |
| 562 | for (i = 0; i < used_rects; i++) { |
| 563 | if (!implicit_rect && arith2_get_bit(&acoder)) { |
| 564 | av_log(avctx, AV_LOG_ERROR, "Unexpected grandchildren\n"); |
| 565 | return AVERROR_INVALIDDATA; |
| 566 | } |
| 567 | if (!i) { |
| 568 | wmv9_mask = arith2_get_bit(&acoder) - 1; |
| 569 | if (!wmv9_mask) |
| 570 | wmv9_mask = arith2_get_number(&acoder, 256); |
| 571 | } |
| 572 | wmv9rects[i].coded = arith2_get_number(&acoder, 2); |
| 573 | } |
| 574 | |
| 575 | buf += arith2_get_consumed_bytes(&acoder); |
| 576 | buf_size -= arith2_get_consumed_bytes(&acoder); |
| 577 | if (buf_size < 1) |
| 578 | return AVERROR_INVALIDDATA; |
| 579 | } |
| 580 | |
| 581 | c->mvX = c->mvY = 0; |
| 582 | if (keyframe && !is_555) { |
| 583 | if ((i = decode_pal_v2(c, buf, buf_size)) < 0) |
| 584 | return AVERROR_INVALIDDATA; |
| 585 | buf += i; |
| 586 | buf_size -= i; |
| 587 | } else if (has_mv) { |
| 588 | buf += 4; |
| 589 | buf_size -= 4; |
| 590 | if (buf_size < 1) |
| 591 | return AVERROR_INVALIDDATA; |
| 592 | c->mvX = AV_RB16(buf - 4) - avctx->width; |
| 593 | c->mvY = AV_RB16(buf - 2) - avctx->height; |
| 594 | } |
| 595 | |
| 596 | if (c->mvX < 0 || c->mvY < 0) { |
| 597 | FFSWAP(uint8_t *, c->pal_pic, c->last_pal_pic); |
| 598 | |
| 599 | if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) |
| 600 | return ret; |
| 601 | |
| 602 | if (ctx->last_pic->data[0]) { |
| 603 | av_assert0(frame->linesize[0] == ctx->last_pic->linesize[0]); |
| 604 | c->last_rgb_pic = ctx->last_pic->data[0] + |
| 605 | ctx->last_pic->linesize[0] * (avctx->height - 1); |
| 606 | } else { |
| 607 | av_log(avctx, AV_LOG_ERROR, "Missing keyframe\n"); |
| 608 | return AVERROR_INVALIDDATA; |
| 609 | } |
| 610 | } else { |
| 611 | if ((ret = ff_reget_buffer(avctx, ctx->last_pic)) < 0) |
| 612 | return ret; |
| 613 | if ((ret = av_frame_ref(frame, ctx->last_pic)) < 0) |
| 614 | return ret; |
| 615 | |
| 616 | c->last_rgb_pic = NULL; |
| 617 | } |
| 618 | c->rgb_pic = frame->data[0] + |
| 619 | frame->linesize[0] * (avctx->height - 1); |
| 620 | c->rgb_stride = -frame->linesize[0]; |
| 621 | |
| 622 | frame->key_frame = keyframe; |
| 623 | frame->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; |
| 624 | |
| 625 | if (is_555) { |
| 626 | bytestream2_init(&gB, buf, buf_size); |
| 627 | |
| 628 | if (decode_555(&gB, (uint16_t *)c->rgb_pic, c->rgb_stride >> 1, |
| 629 | keyframe, avctx->width, avctx->height)) |
| 630 | return AVERROR_INVALIDDATA; |
| 631 | |
| 632 | buf_size -= bytestream2_tell(&gB); |
| 633 | } else { |
| 634 | if (keyframe) { |
| 635 | c->corrupted = 0; |
| 636 | ff_mss12_slicecontext_reset(&ctx->sc[0]); |
| 637 | if (c->slice_split) |
| 638 | ff_mss12_slicecontext_reset(&ctx->sc[1]); |
| 639 | } |
| 640 | if (is_rle) { |
| 641 | if ((ret = init_get_bits8(&gb, buf, buf_size)) < 0) |
| 642 | return ret; |
| 643 | if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride, |
| 644 | c->rgb_pic, c->rgb_stride, c->pal, keyframe, |
| 645 | ctx->split_position, 0, |
| 646 | avctx->width, avctx->height)) |
| 647 | return ret; |
| 648 | align_get_bits(&gb); |
| 649 | |
| 650 | if (c->slice_split) |
| 651 | if (ret = decode_rle(&gb, c->pal_pic, c->pal_stride, |
| 652 | c->rgb_pic, c->rgb_stride, c->pal, keyframe, |
| 653 | ctx->split_position, 1, |
| 654 | avctx->width, avctx->height)) |
| 655 | return ret; |
| 656 | |
| 657 | align_get_bits(&gb); |
| 658 | buf += get_bits_count(&gb) >> 3; |
| 659 | buf_size -= get_bits_count(&gb) >> 3; |
| 660 | } else if (!implicit_rect || wmv9_mask != -1) { |
| 661 | if (c->corrupted) |
| 662 | return AVERROR_INVALIDDATA; |
| 663 | bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING); |
| 664 | arith2_init(&acoder, &gB); |
| 665 | c->keyframe = keyframe; |
| 666 | if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[0], &acoder, 0, 0, |
| 667 | avctx->width, |
| 668 | ctx->split_position)) |
| 669 | return AVERROR_INVALIDDATA; |
| 670 | |
| 671 | buf += arith2_get_consumed_bytes(&acoder); |
| 672 | buf_size -= arith2_get_consumed_bytes(&acoder); |
| 673 | if (c->slice_split) { |
| 674 | if (buf_size < 1) |
| 675 | return AVERROR_INVALIDDATA; |
| 676 | bytestream2_init(&gB, buf, buf_size + ARITH2_PADDING); |
| 677 | arith2_init(&acoder, &gB); |
| 678 | if (c->corrupted = ff_mss12_decode_rect(&ctx->sc[1], &acoder, 0, |
| 679 | ctx->split_position, |
| 680 | avctx->width, |
| 681 | avctx->height - ctx->split_position)) |
| 682 | return AVERROR_INVALIDDATA; |
| 683 | |
| 684 | buf += arith2_get_consumed_bytes(&acoder); |
| 685 | buf_size -= arith2_get_consumed_bytes(&acoder); |
| 686 | } |
| 687 | } else |
| 688 | memset(c->pal_pic, 0, c->pal_stride * avctx->height); |
| 689 | } |
| 690 | |
| 691 | if (has_wmv9) { |
| 692 | for (i = 0; i < used_rects; i++) { |
| 693 | int x = wmv9rects[i].x; |
| 694 | int y = wmv9rects[i].y; |
| 695 | int w = wmv9rects[i].w; |
| 696 | int h = wmv9rects[i].h; |
| 697 | if (wmv9rects[i].coded) { |
| 698 | int WMV9codedFrameSize; |
| 699 | if (buf_size < 4 || !(WMV9codedFrameSize = AV_RL24(buf))) |
| 700 | return AVERROR_INVALIDDATA; |
| 701 | if (ret = decode_wmv9(avctx, buf + 3, buf_size - 3, |
| 702 | x, y, w, h, wmv9_mask)) |
| 703 | return ret; |
| 704 | buf += WMV9codedFrameSize + 3; |
| 705 | buf_size -= WMV9codedFrameSize + 3; |
| 706 | } else { |
| 707 | uint8_t *dst = c->rgb_pic + y * c->rgb_stride + x * 3; |
| 708 | if (wmv9_mask != -1) { |
| 709 | ctx->dsp.mss2_gray_fill_masked(dst, c->rgb_stride, |
| 710 | wmv9_mask, |
| 711 | c->pal_pic + y * c->pal_stride + x, |
| 712 | c->pal_stride, |
| 713 | w, h); |
| 714 | } else { |
| 715 | do { |
| 716 | memset(dst, 0x80, w * 3); |
| 717 | dst += c->rgb_stride; |
| 718 | } while (--h); |
| 719 | } |
| 720 | } |
| 721 | } |
| 722 | } |
| 723 | |
| 724 | if (buf_size) |
| 725 | av_log(avctx, AV_LOG_WARNING, "buffer not fully consumed\n"); |
| 726 | |
| 727 | if (c->mvX < 0 || c->mvY < 0) { |
| 728 | av_frame_unref(ctx->last_pic); |
| 729 | ret = av_frame_ref(ctx->last_pic, frame); |
| 730 | if (ret < 0) |
| 731 | return ret; |
| 732 | } |
| 733 | |
| 734 | *got_frame = 1; |
| 735 | |
| 736 | return avpkt->size; |
| 737 | } |
| 738 | |
| 739 | static av_cold int wmv9_init(AVCodecContext *avctx) |
| 740 | { |
| 741 | VC1Context *v = avctx->priv_data; |
| 742 | int ret; |
| 743 | |
| 744 | v->s.avctx = avctx; |
| 745 | |
| 746 | if ((ret = ff_vc1_init_common(v)) < 0) |
| 747 | return ret; |
| 748 | ff_vc1dsp_init(&v->vc1dsp); |
| 749 | |
| 750 | v->profile = PROFILE_MAIN; |
| 751 | |
| 752 | v->zz_8x4 = ff_wmv2_scantableA; |
| 753 | v->zz_4x8 = ff_wmv2_scantableB; |
| 754 | v->res_y411 = 0; |
| 755 | v->res_sprite = 0; |
| 756 | |
| 757 | v->frmrtq_postproc = 7; |
| 758 | v->bitrtq_postproc = 31; |
| 759 | |
| 760 | v->res_x8 = 0; |
| 761 | v->multires = 0; |
| 762 | v->res_fasttx = 1; |
| 763 | |
| 764 | v->fastuvmc = 0; |
| 765 | |
| 766 | v->extended_mv = 0; |
| 767 | |
| 768 | v->dquant = 1; |
| 769 | v->vstransform = 1; |
| 770 | |
| 771 | v->res_transtab = 0; |
| 772 | |
| 773 | v->overlap = 0; |
| 774 | |
| 775 | v->resync_marker = 0; |
| 776 | v->rangered = 0; |
| 777 | |
| 778 | v->s.max_b_frames = avctx->max_b_frames = 0; |
| 779 | v->quantizer_mode = 0; |
| 780 | |
| 781 | v->finterpflag = 0; |
| 782 | |
| 783 | v->res_rtm_flag = 1; |
| 784 | |
| 785 | ff_vc1_init_transposed_scantables(v); |
| 786 | |
| 787 | if ((ret = ff_msmpeg4_decode_init(avctx)) < 0 || |
| 788 | (ret = ff_vc1_decode_init_alloc_tables(v)) < 0) |
| 789 | return ret; |
| 790 | |
| 791 | /* error concealment */ |
| 792 | v->s.me.qpel_put = v->s.qdsp.put_qpel_pixels_tab; |
| 793 | v->s.me.qpel_avg = v->s.qdsp.avg_qpel_pixels_tab; |
| 794 | |
| 795 | return 0; |
| 796 | } |
| 797 | |
| 798 | static av_cold int mss2_decode_end(AVCodecContext *avctx) |
| 799 | { |
| 800 | MSS2Context *const ctx = avctx->priv_data; |
| 801 | |
| 802 | av_frame_free(&ctx->last_pic); |
| 803 | |
| 804 | ff_mss12_decode_end(&ctx->c); |
| 805 | av_freep(&ctx->c.pal_pic); |
| 806 | av_freep(&ctx->c.last_pal_pic); |
| 807 | ff_vc1_decode_end(avctx); |
| 808 | |
| 809 | return 0; |
| 810 | } |
| 811 | |
| 812 | static av_cold int mss2_decode_init(AVCodecContext *avctx) |
| 813 | { |
| 814 | MSS2Context * const ctx = avctx->priv_data; |
| 815 | MSS12Context *c = &ctx->c; |
| 816 | int ret; |
| 817 | c->avctx = avctx; |
| 818 | if (ret = ff_mss12_decode_init(c, 1, &ctx->sc[0], &ctx->sc[1])) |
| 819 | return ret; |
| 820 | ctx->last_pic = av_frame_alloc(); |
| 821 | c->pal_stride = c->mask_stride; |
| 822 | c->pal_pic = av_mallocz(c->pal_stride * avctx->height); |
| 823 | c->last_pal_pic = av_mallocz(c->pal_stride * avctx->height); |
| 824 | if (!c->pal_pic || !c->last_pal_pic || !ctx->last_pic) { |
| 825 | mss2_decode_end(avctx); |
| 826 | return AVERROR(ENOMEM); |
| 827 | } |
| 828 | if (ret = wmv9_init(avctx)) { |
| 829 | mss2_decode_end(avctx); |
| 830 | return ret; |
| 831 | } |
| 832 | ff_mss2dsp_init(&ctx->dsp); |
| 833 | ff_qpeldsp_init(&ctx->qdsp); |
| 834 | |
| 835 | avctx->pix_fmt = c->free_colours == 127 ? AV_PIX_FMT_RGB555 |
| 836 | : AV_PIX_FMT_RGB24; |
| 837 | |
| 838 | |
| 839 | return 0; |
| 840 | } |
| 841 | |
| 842 | AVCodec ff_mss2_decoder = { |
| 843 | .name = "mss2", |
| 844 | .long_name = NULL_IF_CONFIG_SMALL("MS Windows Media Video V9 Screen"), |
| 845 | .type = AVMEDIA_TYPE_VIDEO, |
| 846 | .id = AV_CODEC_ID_MSS2, |
| 847 | .priv_data_size = sizeof(MSS2Context), |
| 848 | .init = mss2_decode_init, |
| 849 | .close = mss2_decode_end, |
| 850 | .decode = mss2_decode_frame, |
| 851 | .capabilities = CODEC_CAP_DR1, |
| 852 | }; |