1/* 2 * Interplay MVE Video Decoder 3 * Copyright (C) 2003 the ffmpeg project 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file libavcodec/interplayvideo.c 24 * Interplay MVE Video Decoder by Mike Melanson (melanson@pcisys.net) 25 * For more information about the Interplay MVE format, visit: 26 * http://www.pcisys.net/~melanson/codecs/interplay-mve.txt 27 * This code is written in such a way that the identifiers match up 28 * with the encoding descriptions in the document. 29 * 30 * This decoder presently only supports a PAL8 output colorspace. 31 * 32 * An Interplay video frame consists of 2 parts: The decoding map and 33 * the video data. A demuxer must load these 2 parts together in a single 34 * buffer before sending it through the stream to this decoder. 35 */ 36 37#include <stdio.h> 38#include <stdlib.h> 39#include <string.h> 40#include <unistd.h> 41 42#include "avcodec.h" 43#include "bytestream.h" 44#include "dsputil.h" 45 46#define PALETTE_COUNT 256 47 48/* debugging support */ 49#define DEBUG_INTERPLAY 0 50#if DEBUG_INTERPLAY 51#define debug_interplay(x,...) av_log(NULL, AV_LOG_DEBUG, x, __VA_ARGS__) 52#else 53static inline void debug_interplay(const char *format, ...) { } 54#endif 55 56typedef struct IpvideoContext { 57 58 AVCodecContext *avctx; 59 DSPContext dsp; 60 AVFrame second_last_frame; 61 AVFrame last_frame; 62 AVFrame current_frame; 63 const unsigned char *decoding_map; 64 int decoding_map_size; 65 66 const unsigned char *buf; 67 int size; 68 69 const unsigned char *stream_ptr; 70 const unsigned char *stream_end; 71 unsigned char *pixel_ptr; 72 int line_inc; 73 int stride; 74 int upper_motion_limit_offset; 75 76} IpvideoContext; 77 78#define CHECK_STREAM_PTR(n) \ 79 if ((s->stream_ptr + n) > s->stream_end) { \ 80 av_log(s->avctx, AV_LOG_ERROR, "Interplay video warning: stream_ptr out of bounds (%p >= %p)\n", \ 81 s->stream_ptr + n, s->stream_end); \ 82 return -1; \ 83 } 84 85#define COPY_FROM_CURRENT() \ 86 motion_offset = current_offset; \ 87 motion_offset += y * s->stride; \ 88 motion_offset += x; \ 89 if (motion_offset < 0) { \ 90 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset); \ 91 return -1; \ 92 } else if (motion_offset > s->upper_motion_limit_offset) { \ 93 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset above limit (%d >= %d)\n", \ 94 motion_offset, s->upper_motion_limit_offset); \ 95 return -1; \ 96 } \ 97 s->dsp.put_pixels_tab[0][0](s->pixel_ptr, \ 98 s->current_frame.data[0] + motion_offset, s->stride, 8); 99 100#define COPY_FROM_PREVIOUS() \ 101 motion_offset = current_offset; \ 102 motion_offset += y * s->stride; \ 103 motion_offset += x; \ 104 if (motion_offset < 0) { \ 105 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset); \ 106 return -1; \ 107 } else if (motion_offset > s->upper_motion_limit_offset) { \ 108 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset above limit (%d >= %d)\n", \ 109 motion_offset, s->upper_motion_limit_offset); \ 110 return -1; \ 111 } \ 112 s->dsp.put_pixels_tab[0][0](s->pixel_ptr, \ 113 s->last_frame.data[0] + motion_offset, s->stride, 8); 114 115#define COPY_FROM_SECOND_LAST() \ 116 motion_offset = current_offset; \ 117 motion_offset += y * s->stride; \ 118 motion_offset += x; \ 119 if (motion_offset < 0) { \ 120 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset); \ 121 return -1; \ 122 } else if (motion_offset > s->upper_motion_limit_offset) { \ 123 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset above limit (%d >= %d)\n", \ 124 motion_offset, s->upper_motion_limit_offset); \ 125 return -1; \ 126 } \ 127 s->dsp.put_pixels_tab[0][0](s->pixel_ptr, \ 128 s->second_last_frame.data[0] + motion_offset, s->stride, 8); 129 130static int ipvideo_decode_block_opcode_0x0(IpvideoContext *s) 131{ 132 int x, y; 133 int motion_offset; 134 int current_offset = s->pixel_ptr - s->current_frame.data[0]; 135 136 /* copy a block from the previous frame */ 137 x = y = 0; 138 COPY_FROM_PREVIOUS(); 139 140 /* report success */ 141 return 0; 142} 143 144static int ipvideo_decode_block_opcode_0x1(IpvideoContext *s) 145{ 146 int x, y; 147 int motion_offset; 148 int current_offset = s->pixel_ptr - s->current_frame.data[0]; 149 150 /* copy block from 2 frames ago */ 151 x = y = 0; 152 COPY_FROM_SECOND_LAST(); 153 154 /* report success */ 155 return 0; 156} 157 158static int ipvideo_decode_block_opcode_0x2(IpvideoContext *s) 159{ 160 unsigned char B; 161 int x, y; 162 int motion_offset; 163 int current_offset = s->pixel_ptr - s->current_frame.data[0]; 164 165 /* copy block from 2 frames ago using a motion vector; need 1 more byte */ 166 CHECK_STREAM_PTR(1); 167 B = *s->stream_ptr++; 168 169 if (B < 56) { 170 x = 8 + (B % 7); 171 y = B / 7; 172 } else { 173 x = -14 + ((B - 56) % 29); 174 y = 8 + ((B - 56) / 29); 175 } 176 177 debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y); 178 COPY_FROM_SECOND_LAST(); 179 180 /* report success */ 181 return 0; 182} 183 184static int ipvideo_decode_block_opcode_0x3(IpvideoContext *s) 185{ 186 unsigned char B; 187 int x, y; 188 int motion_offset; 189 int current_offset = s->pixel_ptr - s->current_frame.data[0]; 190 191 /* copy 8x8 block from current frame from an up/left block */ 192 193 /* need 1 more byte for motion */ 194 CHECK_STREAM_PTR(1); 195 B = *s->stream_ptr++; 196 197 if (B < 56) { 198 x = -(8 + (B % 7)); 199 y = -(B / 7); 200 } else { 201 x = -(-14 + ((B - 56) % 29)); 202 y = -( 8 + ((B - 56) / 29)); 203 } 204 205 debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y); 206 COPY_FROM_CURRENT(); 207 208 /* report success */ 209 return 0; 210} 211 212static int ipvideo_decode_block_opcode_0x4(IpvideoContext *s) 213{ 214 int x, y; 215 unsigned char B, BL, BH; 216 int motion_offset; 217 int current_offset = s->pixel_ptr - s->current_frame.data[0]; 218 219 /* copy a block from the previous frame; need 1 more byte */ 220 CHECK_STREAM_PTR(1); 221 222 B = *s->stream_ptr++; 223 BL = B & 0x0F; 224 BH = (B >> 4) & 0x0F; 225 x = -8 + BL; 226 y = -8 + BH; 227 228 debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y); 229 COPY_FROM_PREVIOUS(); 230 231 /* report success */ 232 return 0; 233} 234 235static int ipvideo_decode_block_opcode_0x5(IpvideoContext *s) 236{ 237 signed char x, y; 238 int motion_offset; 239 int current_offset = s->pixel_ptr - s->current_frame.data[0]; 240 241 /* copy a block from the previous frame using an expanded range; 242 * need 2 more bytes */ 243 CHECK_STREAM_PTR(2); 244 245 x = *s->stream_ptr++; 246 y = *s->stream_ptr++; 247 248 debug_interplay (" motion bytes = %d, %d\n", x, y); 249 COPY_FROM_PREVIOUS(); 250 251 /* report success */ 252 return 0; 253} 254 255static int ipvideo_decode_block_opcode_0x6(IpvideoContext *s) 256{ 257 /* mystery opcode? skip multiple blocks? */ 258 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: Help! Mystery opcode 0x6 seen\n"); 259 260 /* report success */ 261 return 0; 262} 263 264static int ipvideo_decode_block_opcode_0x7(IpvideoContext *s) 265{ 266 int x, y; 267 unsigned char P0, P1; 268 unsigned char B[8]; 269 unsigned int flags; 270 int bitmask; 271 272 /* 2-color encoding */ 273 CHECK_STREAM_PTR(2); 274 275 P0 = *s->stream_ptr++; 276 P1 = *s->stream_ptr++; 277 278 if (P0 <= P1) { 279 280 /* need 8 more bytes from the stream */ 281 CHECK_STREAM_PTR(8); 282 for (y = 0; y < 8; y++) 283 B[y] = *s->stream_ptr++; 284 285 for (y = 0; y < 8; y++) { 286 flags = B[y]; 287 for (x = 0x01; x <= 0x80; x <<= 1) { 288 if (flags & x) 289 *s->pixel_ptr++ = P1; 290 else 291 *s->pixel_ptr++ = P0; 292 } 293 s->pixel_ptr += s->line_inc; 294 } 295 296 } else { 297 298 /* need 2 more bytes from the stream */ 299 CHECK_STREAM_PTR(2); 300 301 flags = bytestream_get_le16(&s->stream_ptr); 302 bitmask = 0x0001; 303 for (y = 0; y < 8; y += 2) { 304 for (x = 0; x < 8; x += 2, bitmask <<= 1) { 305 if (flags & bitmask) { 306 *(s->pixel_ptr + x) = P1; 307 *(s->pixel_ptr + x + 1) = P1; 308 *(s->pixel_ptr + s->stride + x) = P1; 309 *(s->pixel_ptr + s->stride + x + 1) = P1; 310 } else { 311 *(s->pixel_ptr + x) = P0; 312 *(s->pixel_ptr + x + 1) = P0; 313 *(s->pixel_ptr + s->stride + x) = P0; 314 *(s->pixel_ptr + s->stride + x + 1) = P0; 315 } 316 } 317 s->pixel_ptr += s->stride * 2; 318 } 319 } 320 321 /* report success */ 322 return 0; 323} 324 325static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s) 326{ 327 int x, y; 328 unsigned char P[8]; 329 unsigned char B[8]; 330 unsigned int flags = 0; 331 unsigned int bitmask = 0; 332 unsigned char P0 = 0, P1 = 0; 333 int lower_half = 0; 334 335 /* 2-color encoding for each 4x4 quadrant, or 2-color encoding on 336 * either top and bottom or left and right halves */ 337 CHECK_STREAM_PTR(2); 338 339 P[0] = *s->stream_ptr++; 340 P[1] = *s->stream_ptr++; 341 342 if (P[0] <= P[1]) { 343 344 /* need 12 more bytes */ 345 CHECK_STREAM_PTR(12); 346 B[0] = *s->stream_ptr++; B[1] = *s->stream_ptr++; 347 P[2] = *s->stream_ptr++; P[3] = *s->stream_ptr++; 348 B[2] = *s->stream_ptr++; B[3] = *s->stream_ptr++; 349 P[4] = *s->stream_ptr++; P[5] = *s->stream_ptr++; 350 B[4] = *s->stream_ptr++; B[5] = *s->stream_ptr++; 351 P[6] = *s->stream_ptr++; P[7] = *s->stream_ptr++; 352 B[6] = *s->stream_ptr++; B[7] = *s->stream_ptr++; 353 354 for (y = 0; y < 8; y++) { 355 356 /* time to reload flags? */ 357 if (y == 0) { 358 flags = 359 ((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) | 360 ((B[0] & 0x0F) ) | ((B[4] & 0x0F) << 4) | 361 ((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) | 362 ((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20); 363 bitmask = 0x00000001; 364 lower_half = 0; /* still on top half */ 365 } else if (y == 4) { 366 flags = 367 ((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) | 368 ((B[2] & 0x0F) ) | ((B[6] & 0x0F) << 4) | 369 ((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) | 370 ((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20); 371 bitmask = 0x00000001; 372 lower_half = 2; 373 } 374 375 for (x = 0; x < 8; x++, bitmask <<= 1) { 376 /* get the pixel values ready for this quadrant */ 377 if (x == 0) { 378 P0 = P[lower_half + 0]; 379 P1 = P[lower_half + 1]; 380 } else if (x == 4) { 381 P0 = P[lower_half + 4]; 382 P1 = P[lower_half + 5]; 383 } 384 385 if (flags & bitmask) 386 *s->pixel_ptr++ = P1; 387 else 388 *s->pixel_ptr++ = P0; 389 } 390 s->pixel_ptr += s->line_inc; 391 } 392 393 } else { 394 395 /* need 10 more bytes */ 396 CHECK_STREAM_PTR(10); 397 B[0] = *s->stream_ptr++; B[1] = *s->stream_ptr++; 398 B[2] = *s->stream_ptr++; B[3] = *s->stream_ptr++; 399 P[2] = *s->stream_ptr++; P[3] = *s->stream_ptr++; 400 B[4] = *s->stream_ptr++; B[5] = *s->stream_ptr++; 401 B[6] = *s->stream_ptr++; B[7] = *s->stream_ptr++; 402 403 if (P[2] <= P[3]) { 404 405 /* vertical split; left & right halves are 2-color encoded */ 406 407 for (y = 0; y < 8; y++) { 408 409 /* time to reload flags? */ 410 if (y == 0) { 411 flags = 412 ((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) | 413 ((B[0] & 0x0F) ) | ((B[4] & 0x0F) << 4) | 414 ((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) | 415 ((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20); 416 bitmask = 0x00000001; 417 } else if (y == 4) { 418 flags = 419 ((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) | 420 ((B[2] & 0x0F) ) | ((B[6] & 0x0F) << 4) | 421 ((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) | 422 ((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20); 423 bitmask = 0x00000001; 424 } 425 426 for (x = 0; x < 8; x++, bitmask <<= 1) { 427 /* get the pixel values ready for this half */ 428 if (x == 0) { 429 P0 = P[0]; 430 P1 = P[1]; 431 } else if (x == 4) { 432 P0 = P[2]; 433 P1 = P[3]; 434 } 435 436 if (flags & bitmask) 437 *s->pixel_ptr++ = P1; 438 else 439 *s->pixel_ptr++ = P0; 440 } 441 s->pixel_ptr += s->line_inc; 442 } 443 444 } else { 445 446 /* horizontal split; top & bottom halves are 2-color encoded */ 447 448 for (y = 0; y < 8; y++) { 449 450 flags = B[y]; 451 if (y == 0) { 452 P0 = P[0]; 453 P1 = P[1]; 454 } else if (y == 4) { 455 P0 = P[2]; 456 P1 = P[3]; 457 } 458 459 for (bitmask = 0x01; bitmask <= 0x80; bitmask <<= 1) { 460 461 if (flags & bitmask) 462 *s->pixel_ptr++ = P1; 463 else 464 *s->pixel_ptr++ = P0; 465 } 466 s->pixel_ptr += s->line_inc; 467 } 468 } 469 } 470 471 /* report success */ 472 return 0; 473} 474 475static int ipvideo_decode_block_opcode_0x9(IpvideoContext *s) 476{ 477 int x, y; 478 unsigned char P[4]; 479 unsigned int flags = 0; 480 int shifter = 0; 481 unsigned char pix; 482 483 /* 4-color encoding */ 484 CHECK_STREAM_PTR(4); 485 486 for (y = 0; y < 4; y++) 487 P[y] = *s->stream_ptr++; 488 489 if ((P[0] <= P[1]) && (P[2] <= P[3])) { 490 491 /* 1 of 4 colors for each pixel, need 16 more bytes */ 492 CHECK_STREAM_PTR(16); 493 494 for (y = 0; y < 8; y++) { 495 /* get the next set of 8 2-bit flags */ 496 flags = bytestream_get_le16(&s->stream_ptr); 497 for (x = 0, shifter = 0; x < 8; x++, shifter += 2) { 498 *s->pixel_ptr++ = P[(flags >> shifter) & 0x03]; 499 } 500 s->pixel_ptr += s->line_inc; 501 } 502 503 } else if ((P[0] <= P[1]) && (P[2] > P[3])) { 504 505 /* 1 of 4 colors for each 2x2 block, need 4 more bytes */ 506 CHECK_STREAM_PTR(4); 507 508 flags = bytestream_get_le32(&s->stream_ptr); 509 shifter = 0; 510 511 for (y = 0; y < 8; y += 2) { 512 for (x = 0; x < 8; x += 2, shifter += 2) { 513 pix = P[(flags >> shifter) & 0x03]; 514 *(s->pixel_ptr + x) = pix; 515 *(s->pixel_ptr + x + 1) = pix; 516 *(s->pixel_ptr + s->stride + x) = pix; 517 *(s->pixel_ptr + s->stride + x + 1) = pix; 518 } 519 s->pixel_ptr += s->stride * 2; 520 } 521 522 } else if ((P[0] > P[1]) && (P[2] <= P[3])) { 523 524 /* 1 of 4 colors for each 2x1 block, need 8 more bytes */ 525 CHECK_STREAM_PTR(8); 526 527 for (y = 0; y < 8; y++) { 528 /* time to reload flags? */ 529 if ((y == 0) || (y == 4)) { 530 flags = bytestream_get_le32(&s->stream_ptr); 531 shifter = 0; 532 } 533 for (x = 0; x < 8; x += 2, shifter += 2) { 534 pix = P[(flags >> shifter) & 0x03]; 535 *(s->pixel_ptr + x) = pix; 536 *(s->pixel_ptr + x + 1) = pix; 537 } 538 s->pixel_ptr += s->stride; 539 } 540 541 } else { 542 543 /* 1 of 4 colors for each 1x2 block, need 8 more bytes */ 544 CHECK_STREAM_PTR(8); 545 546 for (y = 0; y < 8; y += 2) { 547 /* time to reload flags? */ 548 if ((y == 0) || (y == 4)) { 549 flags = bytestream_get_le32(&s->stream_ptr); 550 shifter = 0; 551 } 552 for (x = 0; x < 8; x++, shifter += 2) { 553 pix = P[(flags >> shifter) & 0x03]; 554 *(s->pixel_ptr + x) = pix; 555 *(s->pixel_ptr + s->stride + x) = pix; 556 } 557 s->pixel_ptr += s->stride * 2; 558 } 559 } 560 561 /* report success */ 562 return 0; 563} 564 565static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s) 566{ 567 int x, y; 568 unsigned char P[16]; 569 unsigned char B[16]; 570 int flags = 0; 571 int shifter = 0; 572 int index; 573 int split; 574 int lower_half; 575 576 /* 4-color encoding for each 4x4 quadrant, or 4-color encoding on 577 * either top and bottom or left and right halves */ 578 CHECK_STREAM_PTR(4); 579 580 for (y = 0; y < 4; y++) 581 P[y] = *s->stream_ptr++; 582 583 if (P[0] <= P[1]) { 584 585 /* 4-color encoding for each quadrant; need 28 more bytes */ 586 CHECK_STREAM_PTR(28); 587 588 for (y = 0; y < 4; y++) 589 B[y] = *s->stream_ptr++; 590 for (y = 4; y < 16; y += 4) { 591 for (x = y; x < y + 4; x++) 592 P[x] = *s->stream_ptr++; 593 for (x = y; x < y + 4; x++) 594 B[x] = *s->stream_ptr++; 595 } 596 597 for (y = 0; y < 8; y++) { 598 599 lower_half = (y >= 4) ? 4 : 0; 600 flags = (B[y + 8] << 8) | B[y]; 601 602 for (x = 0, shifter = 0; x < 8; x++, shifter += 2) { 603 split = (x >= 4) ? 8 : 0; 604 index = split + lower_half + ((flags >> shifter) & 0x03); 605 *s->pixel_ptr++ = P[index]; 606 } 607 608 s->pixel_ptr += s->line_inc; 609 } 610 611 } else { 612 613 /* 4-color encoding for either left and right or top and bottom 614 * halves; need 20 more bytes */ 615 CHECK_STREAM_PTR(20); 616 617 for (y = 0; y < 8; y++) 618 B[y] = *s->stream_ptr++; 619 for (y = 4; y < 8; y++) 620 P[y] = *s->stream_ptr++; 621 for (y = 8; y < 16; y++) 622 B[y] = *s->stream_ptr++; 623 624 if (P[4] <= P[5]) { 625 626 /* block is divided into left and right halves */ 627 for (y = 0; y < 8; y++) { 628 629 flags = (B[y + 8] << 8) | B[y]; 630 split = 0; 631 632 for (x = 0, shifter = 0; x < 8; x++, shifter += 2) { 633 if (x == 4) 634 split = 4; 635 *s->pixel_ptr++ = P[split + ((flags >> shifter) & 0x03)]; 636 } 637 638 s->pixel_ptr += s->line_inc; 639 } 640 641 } else { 642 643 /* block is divided into top and bottom halves */ 644 split = 0; 645 for (y = 0; y < 8; y++) { 646 647 flags = (B[y * 2 + 1] << 8) | B[y * 2]; 648 if (y == 4) 649 split = 4; 650 651 for (x = 0, shifter = 0; x < 8; x++, shifter += 2) 652 *s->pixel_ptr++ = P[split + ((flags >> shifter) & 0x03)]; 653 654 s->pixel_ptr += s->line_inc; 655 } 656 } 657 } 658 659 /* report success */ 660 return 0; 661} 662 663static int ipvideo_decode_block_opcode_0xB(IpvideoContext *s) 664{ 665 int x, y; 666 667 /* 64-color encoding (each pixel in block is a different color) */ 668 CHECK_STREAM_PTR(64); 669 670 for (y = 0; y < 8; y++) { 671 for (x = 0; x < 8; x++) { 672 *s->pixel_ptr++ = *s->stream_ptr++; 673 } 674 s->pixel_ptr += s->line_inc; 675 } 676 677 /* report success */ 678 return 0; 679} 680 681static int ipvideo_decode_block_opcode_0xC(IpvideoContext *s) 682{ 683 int x, y; 684 unsigned char pix; 685 686 /* 16-color block encoding: each 2x2 block is a different color */ 687 CHECK_STREAM_PTR(16); 688 689 for (y = 0; y < 8; y += 2) { 690 for (x = 0; x < 8; x += 2) { 691 pix = *s->stream_ptr++; 692 *(s->pixel_ptr + x) = pix; 693 *(s->pixel_ptr + x + 1) = pix; 694 *(s->pixel_ptr + s->stride + x) = pix; 695 *(s->pixel_ptr + s->stride + x + 1) = pix; 696 } 697 s->pixel_ptr += s->stride * 2; 698 } 699 700 /* report success */ 701 return 0; 702} 703 704static int ipvideo_decode_block_opcode_0xD(IpvideoContext *s) 705{ 706 int x, y; 707 unsigned char P[4]; 708 unsigned char index = 0; 709 710 /* 4-color block encoding: each 4x4 block is a different color */ 711 CHECK_STREAM_PTR(4); 712 713 for (y = 0; y < 4; y++) 714 P[y] = *s->stream_ptr++; 715 716 for (y = 0; y < 8; y++) { 717 if (y < 4) 718 index = 0; 719 else 720 index = 2; 721 722 for (x = 0; x < 8; x++) { 723 if (x == 4) 724 index++; 725 *s->pixel_ptr++ = P[index]; 726 } 727 s->pixel_ptr += s->line_inc; 728 } 729 730 /* report success */ 731 return 0; 732} 733 734static int ipvideo_decode_block_opcode_0xE(IpvideoContext *s) 735{ 736 int x, y; 737 unsigned char pix; 738 739 /* 1-color encoding: the whole block is 1 solid color */ 740 CHECK_STREAM_PTR(1); 741 pix = *s->stream_ptr++; 742 743 for (y = 0; y < 8; y++) { 744 for (x = 0; x < 8; x++) { 745 *s->pixel_ptr++ = pix; 746 } 747 s->pixel_ptr += s->line_inc; 748 } 749 750 /* report success */ 751 return 0; 752} 753 754static int ipvideo_decode_block_opcode_0xF(IpvideoContext *s) 755{ 756 int x, y; 757 unsigned char sample0, sample1; 758 759 /* dithered encoding */ 760 CHECK_STREAM_PTR(2); 761 sample0 = *s->stream_ptr++; 762 sample1 = *s->stream_ptr++; 763 764 for (y = 0; y < 8; y++) { 765 for (x = 0; x < 8; x += 2) { 766 if (y & 1) { 767 *s->pixel_ptr++ = sample1; 768 *s->pixel_ptr++ = sample0; 769 } else { 770 *s->pixel_ptr++ = sample0; 771 *s->pixel_ptr++ = sample1; 772 } 773 } 774 s->pixel_ptr += s->line_inc; 775 } 776 777 /* report success */ 778 return 0; 779} 780 781static int (*ipvideo_decode_block[16])(IpvideoContext *s); 782 783static void ipvideo_decode_opcodes(IpvideoContext *s) 784{ 785 int x, y; 786 int index = 0; 787 unsigned char opcode; 788 int ret; 789 int code_counts[16]; 790 static int frame = 0; 791 792 debug_interplay("------------------ frame %d\n", frame); 793 frame++; 794 795 for (x = 0; x < 16; x++) 796 code_counts[x] = 0; 797 798 /* this is PAL8, so make the palette available */ 799 memcpy(s->current_frame.data[1], s->avctx->palctrl->palette, PALETTE_COUNT * 4); 800 801 s->stride = s->current_frame.linesize[0]; 802 s->stream_ptr = s->buf + 14; /* data starts 14 bytes in */ 803 s->stream_end = s->buf + s->size; 804 s->line_inc = s->stride - 8; 805 s->upper_motion_limit_offset = (s->avctx->height - 8) * s->stride 806 + s->avctx->width - 8; 807 808 for (y = 0; y < (s->stride * s->avctx->height); y += s->stride * 8) { 809 for (x = y; x < y + s->avctx->width; x += 8) { 810 /* bottom nibble first, then top nibble (which makes it 811 * hard to use a GetBitcontext) */ 812 if (index & 1) 813 opcode = s->decoding_map[index >> 1] >> 4; 814 else 815 opcode = s->decoding_map[index >> 1] & 0xF; 816 index++; 817 818 debug_interplay(" block @ (%3d, %3d): encoding 0x%X, data ptr @ %p\n", 819 x - y, y / s->stride, opcode, s->stream_ptr); 820 code_counts[opcode]++; 821 822 s->pixel_ptr = s->current_frame.data[0] + x; 823 ret = ipvideo_decode_block[opcode](s); 824 if (ret != 0) { 825 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode problem on frame %d, @ block (%d, %d)\n", 826 frame, x - y, y / s->stride); 827 return; 828 } 829 } 830 } 831 if ((s->stream_ptr != s->stream_end) && 832 (s->stream_ptr + 1 != s->stream_end)) { 833 av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode finished with %td bytes left over\n", 834 s->stream_end - s->stream_ptr); 835 } 836} 837 838static av_cold int ipvideo_decode_init(AVCodecContext *avctx) 839{ 840 IpvideoContext *s = avctx->priv_data; 841 842 s->avctx = avctx; 843 844 if (s->avctx->palctrl == NULL) { 845 av_log(avctx, AV_LOG_ERROR, " Interplay video: palette expected.\n"); 846 return -1; 847 } 848 849 avctx->pix_fmt = PIX_FMT_PAL8; 850 dsputil_init(&s->dsp, avctx); 851 852 /* decoding map contains 4 bits of information per 8x8 block */ 853 s->decoding_map_size = avctx->width * avctx->height / (8 * 8 * 2); 854 855 /* assign block decode functions */ 856 ipvideo_decode_block[0x0] = ipvideo_decode_block_opcode_0x0; 857 ipvideo_decode_block[0x1] = ipvideo_decode_block_opcode_0x1; 858 ipvideo_decode_block[0x2] = ipvideo_decode_block_opcode_0x2; 859 ipvideo_decode_block[0x3] = ipvideo_decode_block_opcode_0x3; 860 ipvideo_decode_block[0x4] = ipvideo_decode_block_opcode_0x4; 861 ipvideo_decode_block[0x5] = ipvideo_decode_block_opcode_0x5; 862 ipvideo_decode_block[0x6] = ipvideo_decode_block_opcode_0x6; 863 ipvideo_decode_block[0x7] = ipvideo_decode_block_opcode_0x7; 864 ipvideo_decode_block[0x8] = ipvideo_decode_block_opcode_0x8; 865 ipvideo_decode_block[0x9] = ipvideo_decode_block_opcode_0x9; 866 ipvideo_decode_block[0xA] = ipvideo_decode_block_opcode_0xA; 867 ipvideo_decode_block[0xB] = ipvideo_decode_block_opcode_0xB; 868 ipvideo_decode_block[0xC] = ipvideo_decode_block_opcode_0xC; 869 ipvideo_decode_block[0xD] = ipvideo_decode_block_opcode_0xD; 870 ipvideo_decode_block[0xE] = ipvideo_decode_block_opcode_0xE; 871 ipvideo_decode_block[0xF] = ipvideo_decode_block_opcode_0xF; 872 873 s->current_frame.data[0] = s->last_frame.data[0] = 874 s->second_last_frame.data[0] = NULL; 875 876 return 0; 877} 878 879static int ipvideo_decode_frame(AVCodecContext *avctx, 880 void *data, int *data_size, 881 const uint8_t *buf, int buf_size) 882{ 883 IpvideoContext *s = avctx->priv_data; 884 AVPaletteControl *palette_control = avctx->palctrl; 885 886 /* compressed buffer needs to be large enough to at least hold an entire 887 * decoding map */ 888 if (buf_size < s->decoding_map_size) 889 return buf_size; 890 891 s->decoding_map = buf; 892 s->buf = buf + s->decoding_map_size; 893 s->size = buf_size - s->decoding_map_size; 894 895 s->current_frame.reference = 3; 896 if (avctx->get_buffer(avctx, &s->current_frame)) { 897 av_log(avctx, AV_LOG_ERROR, " Interplay Video: get_buffer() failed\n"); 898 return -1; 899 } 900 901 ipvideo_decode_opcodes(s); 902 903 if (palette_control->palette_changed) { 904 palette_control->palette_changed = 0; 905 s->current_frame.palette_has_changed = 1; 906 } 907 908 *data_size = sizeof(AVFrame); 909 *(AVFrame*)data = s->current_frame; 910 911 /* shuffle frames */ 912 if (s->second_last_frame.data[0]) 913 avctx->release_buffer(avctx, &s->second_last_frame); 914 s->second_last_frame = s->last_frame; 915 s->last_frame = s->current_frame; 916 s->current_frame.data[0] = NULL; /* catch any access attempts */ 917 918 /* report that the buffer was completely consumed */ 919 return buf_size; 920} 921 922static av_cold int ipvideo_decode_end(AVCodecContext *avctx) 923{ 924 IpvideoContext *s = avctx->priv_data; 925 926 /* release the last frame */ 927 if (s->last_frame.data[0]) 928 avctx->release_buffer(avctx, &s->last_frame); 929 if (s->second_last_frame.data[0]) 930 avctx->release_buffer(avctx, &s->second_last_frame); 931 932 return 0; 933} 934 935AVCodec interplay_video_decoder = { 936 "interplayvideo", 937 CODEC_TYPE_VIDEO, 938 CODEC_ID_INTERPLAY_VIDEO, 939 sizeof(IpvideoContext), 940 ipvideo_decode_init, 941 NULL, 942 ipvideo_decode_end, 943 ipvideo_decode_frame, 944 CODEC_CAP_DR1, 945 .long_name = NULL_IF_CONFIG_SMALL("Interplay MVE video"), 946}; 947