1/* 2 * Duck TrueMotion 1.0 Decoder 3 * Copyright (C) 2003 Alex Beregszaszi & Mike Melanson 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 24 * Duck TrueMotion v1 Video Decoder by 25 * Alex Beregszaszi and 26 * Mike Melanson (melanson@pcisys.net) 27 * 28 * The TrueMotion v1 decoder presently only decodes 16-bit TM1 data and 29 * outputs RGB555 (or RGB565) data. 24-bit TM1 data is not supported yet. 30 */ 31 32#include <stdio.h> 33#include <stdlib.h> 34#include <string.h> 35 36#include "avcodec.h" 37#include "codec_internal.h" 38#include "internal.h" 39#include "libavutil/imgutils.h" 40#include "libavutil/internal.h" 41#include "libavutil/intreadwrite.h" 42#include "libavutil/mem.h" 43 44#include "truemotion1data.h" 45 46typedef struct TrueMotion1Context { 47 AVCodecContext *avctx; 48 AVFrame *frame; 49 50 const uint8_t *buf; 51 int size; 52 53 const uint8_t *mb_change_bits; 54 int mb_change_bits_row_size; 55 const uint8_t *index_stream; 56 int index_stream_size; 57 58 int flags; 59 int x, y, w, h; 60 61 uint32_t y_predictor_table[1024]; 62 uint32_t c_predictor_table[1024]; 63 uint32_t fat_y_predictor_table[1024]; 64 uint32_t fat_c_predictor_table[1024]; 65 66 int compression; 67 int block_type; 68 int block_width; 69 int block_height; 70 71 int16_t ydt[8]; 72 int16_t cdt[8]; 73 int16_t fat_ydt[8]; 74 int16_t fat_cdt[8]; 75 76 int last_deltaset, last_vectable; 77 78 unsigned int *vert_pred; 79 int vert_pred_size; 80 81} TrueMotion1Context; 82 83#define FLAG_SPRITE 32 84#define FLAG_KEYFRAME 16 85#define FLAG_INTERFRAME 8 86#define FLAG_INTERPOLATED 4 87 88struct frame_header { 89 uint8_t header_size; 90 uint8_t compression; 91 uint8_t deltaset; 92 uint8_t vectable; 93 uint16_t ysize; 94 uint16_t xsize; 95 uint16_t checksum; 96 uint8_t version; 97 uint8_t header_type; 98 uint8_t flags; 99 uint8_t control; 100 uint16_t xoffset; 101 uint16_t yoffset; 102 uint16_t width; 103 uint16_t height; 104}; 105 106#define ALGO_NOP 0 107#define ALGO_RGB16V 1 108#define ALGO_RGB16H 2 109#define ALGO_RGB24H 3 110 111/* these are the various block sizes that can occupy a 4x4 block */ 112#define BLOCK_2x2 0 113#define BLOCK_2x4 1 114#define BLOCK_4x2 2 115#define BLOCK_4x4 3 116 117typedef struct comp_types { 118 int algorithm; 119 int block_width; // vres 120 int block_height; // hres 121 int block_type; 122} comp_types; 123 124/* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */ 125static const comp_types compression_types[17] = { 126 { ALGO_NOP, 0, 0, 0 }, 127 128 { ALGO_RGB16V, 4, 4, BLOCK_4x4 }, 129 { ALGO_RGB16H, 4, 4, BLOCK_4x4 }, 130 { ALGO_RGB16V, 4, 2, BLOCK_4x2 }, 131 { ALGO_RGB16H, 4, 2, BLOCK_4x2 }, 132 133 { ALGO_RGB16V, 2, 4, BLOCK_2x4 }, 134 { ALGO_RGB16H, 2, 4, BLOCK_2x4 }, 135 { ALGO_RGB16V, 2, 2, BLOCK_2x2 }, 136 { ALGO_RGB16H, 2, 2, BLOCK_2x2 }, 137 138 { ALGO_NOP, 4, 4, BLOCK_4x4 }, 139 { ALGO_RGB24H, 4, 4, BLOCK_4x4 }, 140 { ALGO_NOP, 4, 2, BLOCK_4x2 }, 141 { ALGO_RGB24H, 4, 2, BLOCK_4x2 }, 142 143 { ALGO_NOP, 2, 4, BLOCK_2x4 }, 144 { ALGO_RGB24H, 2, 4, BLOCK_2x4 }, 145 { ALGO_NOP, 2, 2, BLOCK_2x2 }, 146 { ALGO_RGB24H, 2, 2, BLOCK_2x2 } 147}; 148 149static void select_delta_tables(TrueMotion1Context *s, int delta_table_index) 150{ 151 int i; 152 153 if (delta_table_index > 3) 154 return; 155 156 memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t)); 157 memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t)); 158 memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t)); 159 memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t)); 160 161 /* Y skinny deltas need to be halved for some reason; maybe the 162 * skinny Y deltas should be modified */ 163 for (i = 0; i < 8; i++) 164 { 165 /* drop the lsb before dividing by 2-- net effect: round down 166 * when dividing a negative number (e.g., -3/2 = -2, not -1) */ 167 s->ydt[i] &= 0xFFFE; 168 s->ydt[i] /= 2; 169 } 170} 171 172#if HAVE_BIGENDIAN 173static int make_ydt15_entry(int p2, int p1, int16_t *ydt) 174#else 175static int make_ydt15_entry(int p1, int p2, int16_t *ydt) 176#endif 177{ 178 int lo, hi; 179 180 lo = ydt[p1]; 181 lo += (lo * 32) + (lo * 1024); 182 hi = ydt[p2]; 183 hi += (hi * 32) + (hi * 1024); 184 return (lo + (hi * (1U << 16))) * 2; 185} 186 187static int make_cdt15_entry(int p1, int p2, int16_t *cdt) 188{ 189 int r, b, lo; 190 191 b = cdt[p2]; 192 r = cdt[p1] * 1024; 193 lo = b + r; 194 return (lo + (lo * (1U << 16))) * 2; 195} 196 197#if HAVE_BIGENDIAN 198static int make_ydt16_entry(int p2, int p1, int16_t *ydt) 199#else 200static int make_ydt16_entry(int p1, int p2, int16_t *ydt) 201#endif 202{ 203 int lo, hi; 204 205 lo = ydt[p1]; 206 lo += (lo << 6) + (lo << 11); 207 hi = ydt[p2]; 208 hi += (hi << 6) + (hi << 11); 209 return (lo + (hi << 16)) << 1; 210} 211 212static int make_cdt16_entry(int p1, int p2, int16_t *cdt) 213{ 214 int r, b, lo; 215 216 b = cdt[p2]; 217 r = cdt[p1] << 11; 218 lo = b + r; 219 return (lo + (lo * (1 << 16))) * 2; 220} 221 222static int make_ydt24_entry(int p1, int p2, int16_t *ydt) 223{ 224 int lo, hi; 225 226 lo = ydt[p1]; 227 hi = ydt[p2]; 228 return (lo + (hi * (1 << 8)) + (hi * (1 << 16))) * 2; 229} 230 231static int make_cdt24_entry(int p1, int p2, int16_t *cdt) 232{ 233 int r, b; 234 235 b = cdt[p2]; 236 r = cdt[p1] * (1 << 16); 237 return (b+r) * 2; 238} 239 240static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table) 241{ 242 int len, i, j; 243 unsigned char delta_pair; 244 245 for (i = 0; i < 1024; i += 4) 246 { 247 len = *sel_vector_table++ / 2; 248 for (j = 0; j < len; j++) 249 { 250 delta_pair = *sel_vector_table++; 251 s->y_predictor_table[i+j] = 0xfffffffe & 252 make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt); 253 s->c_predictor_table[i+j] = 0xfffffffe & 254 make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt); 255 } 256 s->y_predictor_table[i+(j-1)] |= 1; 257 s->c_predictor_table[i+(j-1)] |= 1; 258 } 259} 260 261static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table) 262{ 263 int len, i, j; 264 unsigned char delta_pair; 265 266 for (i = 0; i < 1024; i += 4) 267 { 268 len = *sel_vector_table++ / 2; 269 for (j = 0; j < len; j++) 270 { 271 delta_pair = *sel_vector_table++; 272 s->y_predictor_table[i+j] = 0xfffffffe & 273 make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt); 274 s->c_predictor_table[i+j] = 0xfffffffe & 275 make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt); 276 } 277 s->y_predictor_table[i+(j-1)] |= 1; 278 s->c_predictor_table[i+(j-1)] |= 1; 279 } 280} 281 282static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table) 283{ 284 int len, i, j; 285 unsigned char delta_pair; 286 287 for (i = 0; i < 1024; i += 4) 288 { 289 len = *sel_vector_table++ / 2; 290 for (j = 0; j < len; j++) 291 { 292 delta_pair = *sel_vector_table++; 293 s->y_predictor_table[i+j] = 0xfffffffe & 294 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt); 295 s->c_predictor_table[i+j] = 0xfffffffe & 296 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt); 297 s->fat_y_predictor_table[i+j] = 0xfffffffe & 298 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt); 299 s->fat_c_predictor_table[i+j] = 0xfffffffe & 300 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt); 301 } 302 s->y_predictor_table[i+(j-1)] |= 1; 303 s->c_predictor_table[i+(j-1)] |= 1; 304 s->fat_y_predictor_table[i+(j-1)] |= 1; 305 s->fat_c_predictor_table[i+(j-1)] |= 1; 306 } 307} 308 309/* Returns the number of bytes consumed from the bytestream. Returns -1 if 310 * there was an error while decoding the header */ 311static int truemotion1_decode_header(TrueMotion1Context *s) 312{ 313 int i, ret; 314 int width_shift = 0; 315 int new_pix_fmt; 316 struct frame_header header; 317 uint8_t header_buffer[128] = { 0 }; /* logical maximum size of the header */ 318 const uint8_t *sel_vector_table; 319 320 header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f; 321 if (s->buf[0] < 0x10) 322 { 323 av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]); 324 return AVERROR_INVALIDDATA; 325 } 326 327 if (header.header_size + 1 > s->size) { 328 av_log(s->avctx, AV_LOG_ERROR, "Input packet too small.\n"); 329 return AVERROR_INVALIDDATA; 330 } 331 332 /* unscramble the header bytes with a XOR operation */ 333 for (i = 1; i < header.header_size; i++) 334 header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1]; 335 336 header.compression = header_buffer[0]; 337 header.deltaset = header_buffer[1]; 338 header.vectable = header_buffer[2]; 339 header.ysize = AV_RL16(&header_buffer[3]); 340 header.xsize = AV_RL16(&header_buffer[5]); 341 header.checksum = AV_RL16(&header_buffer[7]); 342 header.version = header_buffer[9]; 343 header.header_type = header_buffer[10]; 344 header.flags = header_buffer[11]; 345 header.control = header_buffer[12]; 346 347 /* Version 2 */ 348 if (header.version >= 2) 349 { 350 if (header.header_type > 3) 351 { 352 av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type); 353 return AVERROR_INVALIDDATA; 354 } else if ((header.header_type == 2) || (header.header_type == 3)) { 355 s->flags = header.flags; 356 if (!(s->flags & FLAG_INTERFRAME)) 357 s->flags |= FLAG_KEYFRAME; 358 } else 359 s->flags = FLAG_KEYFRAME; 360 } else /* Version 1 */ 361 s->flags = FLAG_KEYFRAME; 362 363 if (s->flags & FLAG_SPRITE) { 364 avpriv_request_sample(s->avctx, "Frame with sprite"); 365 /* FIXME header.width, height, xoffset and yoffset aren't initialized */ 366 return AVERROR_PATCHWELCOME; 367 } else { 368 s->w = header.xsize; 369 s->h = header.ysize; 370 if (header.header_type < 2) { 371 if ((s->w < 213) && (s->h >= 176)) 372 { 373 s->flags |= FLAG_INTERPOLATED; 374 avpriv_request_sample(s->avctx, "Interpolated frame"); 375 } 376 } 377 } 378 379 if (header.compression >= 17) { 380 av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression); 381 return AVERROR_INVALIDDATA; 382 } 383 384 if ((header.deltaset != s->last_deltaset) || 385 (header.vectable != s->last_vectable)) 386 select_delta_tables(s, header.deltaset); 387 388 if ((header.compression & 1) && header.header_type) 389 sel_vector_table = pc_tbl2; 390 else { 391 if (header.vectable > 0 && header.vectable < 4) 392 sel_vector_table = tables[header.vectable - 1]; 393 else { 394 av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable); 395 return AVERROR_INVALIDDATA; 396 } 397 } 398 399 if (compression_types[header.compression].algorithm == ALGO_RGB24H) { 400 new_pix_fmt = AV_PIX_FMT_0RGB32; 401 width_shift = 1; 402 } else 403 new_pix_fmt = AV_PIX_FMT_RGB555; // RGB565 is supported as well 404 405 s->w >>= width_shift; 406 if (s->w & 1) { 407 avpriv_request_sample(s->avctx, "Frame with odd width"); 408 return AVERROR_PATCHWELCOME; 409 } 410 411 if (s->w != s->avctx->width || s->h != s->avctx->height || 412 new_pix_fmt != s->avctx->pix_fmt) { 413 av_frame_unref(s->frame); 414 s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 }; 415 s->avctx->pix_fmt = new_pix_fmt; 416 417 if ((ret = ff_set_dimensions(s->avctx, s->w, s->h)) < 0) 418 return ret; 419 420 ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio); 421 422 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int)); 423 if (!s->vert_pred) 424 return AVERROR(ENOMEM); 425 } 426 427 /* There is 1 change bit per 4 pixels, so each change byte represents 428 * 32 pixels; divide width by 4 to obtain the number of change bits and 429 * then round up to the nearest byte. */ 430 s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3; 431 432 if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable)) 433 { 434 if (compression_types[header.compression].algorithm == ALGO_RGB24H) 435 gen_vector_table24(s, sel_vector_table); 436 else 437 if (s->avctx->pix_fmt == AV_PIX_FMT_RGB555) 438 gen_vector_table15(s, sel_vector_table); 439 else 440 gen_vector_table16(s, sel_vector_table); 441 } 442 443 /* set up pointers to the other key data chunks */ 444 s->mb_change_bits = s->buf + header.header_size; 445 if (s->flags & FLAG_KEYFRAME) { 446 /* no change bits specified for a keyframe; only index bytes */ 447 s->index_stream = s->mb_change_bits; 448 if (s->avctx->width * s->avctx->height / 2048 + header.header_size > s->size) 449 return AVERROR_INVALIDDATA; 450 } else { 451 /* one change bit per 4x4 block */ 452 s->index_stream = s->mb_change_bits + 453 (s->mb_change_bits_row_size * (s->avctx->height >> 2)); 454 } 455 s->index_stream_size = s->size - (s->index_stream - s->buf); 456 457 s->last_deltaset = header.deltaset; 458 s->last_vectable = header.vectable; 459 s->compression = header.compression; 460 s->block_width = compression_types[header.compression].block_width; 461 s->block_height = compression_types[header.compression].block_height; 462 s->block_type = compression_types[header.compression].block_type; 463 464 if (s->avctx->debug & FF_DEBUG_PICT_INFO) 465 av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n", 466 s->last_deltaset, s->last_vectable, s->compression, s->block_width, 467 s->block_height, s->block_type, 468 s->flags & FLAG_KEYFRAME ? " KEY" : "", 469 s->flags & FLAG_INTERFRAME ? " INTER" : "", 470 s->flags & FLAG_SPRITE ? " SPRITE" : "", 471 s->flags & FLAG_INTERPOLATED ? " INTERPOL" : ""); 472 473 return header.header_size; 474} 475 476static av_cold int truemotion1_decode_init(AVCodecContext *avctx) 477{ 478 TrueMotion1Context *s = avctx->priv_data; 479 480 s->avctx = avctx; 481 482 // FIXME: it may change ? 483// if (avctx->bits_per_sample == 24) 484// avctx->pix_fmt = AV_PIX_FMT_RGB24; 485// else 486// avctx->pix_fmt = AV_PIX_FMT_RGB555; 487 488 s->frame = av_frame_alloc(); 489 if (!s->frame) 490 return AVERROR(ENOMEM); 491 492 /* there is a vertical predictor for each pixel in a line; each vertical 493 * predictor is 0 to start with */ 494 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int)); 495 if (!s->vert_pred) 496 return AVERROR(ENOMEM); 497 498 return 0; 499} 500 501/* 502Block decoding order: 503 504dxi: Y-Y 505dxic: Y-C-Y 506dxic2: Y-C-Y-C 507 508hres,vres,i,i%vres (0 < i < 4) 5092x2 0: 0 dxic2 5102x2 1: 1 dxi 5112x2 2: 0 dxic2 5122x2 3: 1 dxi 5132x4 0: 0 dxic2 5142x4 1: 1 dxi 5152x4 2: 2 dxi 5162x4 3: 3 dxi 5174x2 0: 0 dxic 5184x2 1: 1 dxi 5194x2 2: 0 dxic 5204x2 3: 1 dxi 5214x4 0: 0 dxic 5224x4 1: 1 dxi 5234x4 2: 2 dxi 5244x4 3: 3 dxi 525*/ 526 527#define GET_NEXT_INDEX() \ 528{\ 529 if (index_stream_index >= s->index_stream_size) { \ 530 av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \ 531 return; \ 532 } \ 533 index = s->index_stream[index_stream_index++] * 4; \ 534} 535 536#define INC_INDEX \ 537do { \ 538 if (index >= 1023) { \ 539 av_log(s->avctx, AV_LOG_ERROR, "Invalid index value.\n"); \ 540 return; \ 541 } \ 542 index++; \ 543} while (0) 544 545#define APPLY_C_PREDICTOR() \ 546 predictor_pair = s->c_predictor_table[index]; \ 547 horiz_pred += (predictor_pair >> 1); \ 548 if (predictor_pair & 1) { \ 549 GET_NEXT_INDEX() \ 550 if (!index) { \ 551 GET_NEXT_INDEX() \ 552 predictor_pair = s->c_predictor_table[index]; \ 553 horiz_pred += ((predictor_pair >> 1) * 5); \ 554 if (predictor_pair & 1) \ 555 GET_NEXT_INDEX() \ 556 else \ 557 INC_INDEX; \ 558 } \ 559 } else \ 560 INC_INDEX; 561 562#define APPLY_C_PREDICTOR_24() \ 563 predictor_pair = s->c_predictor_table[index]; \ 564 horiz_pred += (predictor_pair >> 1); \ 565 if (predictor_pair & 1) { \ 566 GET_NEXT_INDEX() \ 567 if (!index) { \ 568 GET_NEXT_INDEX() \ 569 predictor_pair = s->fat_c_predictor_table[index]; \ 570 horiz_pred += (predictor_pair >> 1); \ 571 if (predictor_pair & 1) \ 572 GET_NEXT_INDEX() \ 573 else \ 574 INC_INDEX; \ 575 } \ 576 } else \ 577 INC_INDEX; 578 579 580#define APPLY_Y_PREDICTOR() \ 581 predictor_pair = s->y_predictor_table[index]; \ 582 horiz_pred += (predictor_pair >> 1); \ 583 if (predictor_pair & 1) { \ 584 GET_NEXT_INDEX() \ 585 if (!index) { \ 586 GET_NEXT_INDEX() \ 587 predictor_pair = s->y_predictor_table[index]; \ 588 horiz_pred += ((predictor_pair >> 1) * 5); \ 589 if (predictor_pair & 1) \ 590 GET_NEXT_INDEX() \ 591 else \ 592 INC_INDEX; \ 593 } \ 594 } else \ 595 INC_INDEX; 596 597#define APPLY_Y_PREDICTOR_24() \ 598 predictor_pair = s->y_predictor_table[index]; \ 599 horiz_pred += (predictor_pair >> 1); \ 600 if (predictor_pair & 1) { \ 601 GET_NEXT_INDEX() \ 602 if (!index) { \ 603 GET_NEXT_INDEX() \ 604 predictor_pair = s->fat_y_predictor_table[index]; \ 605 horiz_pred += (predictor_pair >> 1); \ 606 if (predictor_pair & 1) \ 607 GET_NEXT_INDEX() \ 608 else \ 609 INC_INDEX; \ 610 } \ 611 } else \ 612 INC_INDEX; 613 614#define OUTPUT_PIXEL_PAIR() \ 615 *current_pixel_pair = *vert_pred + horiz_pred; \ 616 *vert_pred++ = *current_pixel_pair++; 617 618static void truemotion1_decode_16bit(TrueMotion1Context *s) 619{ 620 int y; 621 int pixels_left; /* remaining pixels on this line */ 622 unsigned int predictor_pair; 623 unsigned int horiz_pred; 624 unsigned int *vert_pred; 625 unsigned int *current_pixel_pair; 626 unsigned char *current_line = s->frame->data[0]; 627 int keyframe = s->flags & FLAG_KEYFRAME; 628 629 /* these variables are for managing the stream of macroblock change bits */ 630 const unsigned char *mb_change_bits = s->mb_change_bits; 631 unsigned char mb_change_byte; 632 unsigned char mb_change_byte_mask; 633 int mb_change_index; 634 635 /* these variables are for managing the main index stream */ 636 int index_stream_index = 0; /* yes, the index into the index stream */ 637 int index; 638 639 /* clean out the line buffer */ 640 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int)); 641 642 GET_NEXT_INDEX(); 643 644 for (y = 0; y < s->avctx->height; y++) { 645 646 /* re-init variables for the next line iteration */ 647 horiz_pred = 0; 648 current_pixel_pair = (unsigned int *)current_line; 649 vert_pred = s->vert_pred; 650 mb_change_index = 0; 651 if (!keyframe) 652 mb_change_byte = mb_change_bits[mb_change_index++]; 653 mb_change_byte_mask = 0x01; 654 pixels_left = s->avctx->width; 655 656 while (pixels_left > 0) { 657 658 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) { 659 660 switch (y & 3) { 661 case 0: 662 /* if macroblock width is 2, apply C-Y-C-Y; else 663 * apply C-Y-Y */ 664 if (s->block_width == 2) { 665 APPLY_C_PREDICTOR(); 666 APPLY_Y_PREDICTOR(); 667 OUTPUT_PIXEL_PAIR(); 668 APPLY_C_PREDICTOR(); 669 APPLY_Y_PREDICTOR(); 670 OUTPUT_PIXEL_PAIR(); 671 } else { 672 APPLY_C_PREDICTOR(); 673 APPLY_Y_PREDICTOR(); 674 OUTPUT_PIXEL_PAIR(); 675 APPLY_Y_PREDICTOR(); 676 OUTPUT_PIXEL_PAIR(); 677 } 678 break; 679 680 case 1: 681 case 3: 682 /* always apply 2 Y predictors on these iterations */ 683 APPLY_Y_PREDICTOR(); 684 OUTPUT_PIXEL_PAIR(); 685 APPLY_Y_PREDICTOR(); 686 OUTPUT_PIXEL_PAIR(); 687 break; 688 689 case 2: 690 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y 691 * depending on the macroblock type */ 692 if (s->block_type == BLOCK_2x2) { 693 APPLY_C_PREDICTOR(); 694 APPLY_Y_PREDICTOR(); 695 OUTPUT_PIXEL_PAIR(); 696 APPLY_C_PREDICTOR(); 697 APPLY_Y_PREDICTOR(); 698 OUTPUT_PIXEL_PAIR(); 699 } else if (s->block_type == BLOCK_4x2) { 700 APPLY_C_PREDICTOR(); 701 APPLY_Y_PREDICTOR(); 702 OUTPUT_PIXEL_PAIR(); 703 APPLY_Y_PREDICTOR(); 704 OUTPUT_PIXEL_PAIR(); 705 } else { 706 APPLY_Y_PREDICTOR(); 707 OUTPUT_PIXEL_PAIR(); 708 APPLY_Y_PREDICTOR(); 709 OUTPUT_PIXEL_PAIR(); 710 } 711 break; 712 } 713 714 } else { 715 716 /* skip (copy) four pixels, but reassign the horizontal 717 * predictor */ 718 *vert_pred++ = *current_pixel_pair++; 719 horiz_pred = *current_pixel_pair - *vert_pred; 720 *vert_pred++ = *current_pixel_pair++; 721 722 } 723 724 if (!keyframe) { 725 mb_change_byte_mask <<= 1; 726 727 /* next byte */ 728 if (!mb_change_byte_mask) { 729 mb_change_byte = mb_change_bits[mb_change_index++]; 730 mb_change_byte_mask = 0x01; 731 } 732 } 733 734 pixels_left -= 4; 735 } 736 737 /* next change row */ 738 if (((y + 1) & 3) == 0) 739 mb_change_bits += s->mb_change_bits_row_size; 740 741 current_line += s->frame->linesize[0]; 742 } 743} 744 745static void truemotion1_decode_24bit(TrueMotion1Context *s) 746{ 747 int y; 748 int pixels_left; /* remaining pixels on this line */ 749 unsigned int predictor_pair; 750 unsigned int horiz_pred; 751 unsigned int *vert_pred; 752 unsigned int *current_pixel_pair; 753 unsigned char *current_line = s->frame->data[0]; 754 int keyframe = s->flags & FLAG_KEYFRAME; 755 756 /* these variables are for managing the stream of macroblock change bits */ 757 const unsigned char *mb_change_bits = s->mb_change_bits; 758 unsigned char mb_change_byte; 759 unsigned char mb_change_byte_mask; 760 int mb_change_index; 761 762 /* these variables are for managing the main index stream */ 763 int index_stream_index = 0; /* yes, the index into the index stream */ 764 int index; 765 766 /* clean out the line buffer */ 767 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int)); 768 769 GET_NEXT_INDEX(); 770 771 for (y = 0; y < s->avctx->height; y++) { 772 773 /* re-init variables for the next line iteration */ 774 horiz_pred = 0; 775 current_pixel_pair = (unsigned int *)current_line; 776 vert_pred = s->vert_pred; 777 mb_change_index = 0; 778 mb_change_byte = mb_change_bits[mb_change_index++]; 779 mb_change_byte_mask = 0x01; 780 pixels_left = s->avctx->width; 781 782 while (pixels_left > 0) { 783 784 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) { 785 786 switch (y & 3) { 787 case 0: 788 /* if macroblock width is 2, apply C-Y-C-Y; else 789 * apply C-Y-Y */ 790 if (s->block_width == 2) { 791 APPLY_C_PREDICTOR_24(); 792 APPLY_Y_PREDICTOR_24(); 793 OUTPUT_PIXEL_PAIR(); 794 APPLY_C_PREDICTOR_24(); 795 APPLY_Y_PREDICTOR_24(); 796 OUTPUT_PIXEL_PAIR(); 797 } else { 798 APPLY_C_PREDICTOR_24(); 799 APPLY_Y_PREDICTOR_24(); 800 OUTPUT_PIXEL_PAIR(); 801 APPLY_Y_PREDICTOR_24(); 802 OUTPUT_PIXEL_PAIR(); 803 } 804 break; 805 806 case 1: 807 case 3: 808 /* always apply 2 Y predictors on these iterations */ 809 APPLY_Y_PREDICTOR_24(); 810 OUTPUT_PIXEL_PAIR(); 811 APPLY_Y_PREDICTOR_24(); 812 OUTPUT_PIXEL_PAIR(); 813 break; 814 815 case 2: 816 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y 817 * depending on the macroblock type */ 818 if (s->block_type == BLOCK_2x2) { 819 APPLY_C_PREDICTOR_24(); 820 APPLY_Y_PREDICTOR_24(); 821 OUTPUT_PIXEL_PAIR(); 822 APPLY_C_PREDICTOR_24(); 823 APPLY_Y_PREDICTOR_24(); 824 OUTPUT_PIXEL_PAIR(); 825 } else if (s->block_type == BLOCK_4x2) { 826 APPLY_C_PREDICTOR_24(); 827 APPLY_Y_PREDICTOR_24(); 828 OUTPUT_PIXEL_PAIR(); 829 APPLY_Y_PREDICTOR_24(); 830 OUTPUT_PIXEL_PAIR(); 831 } else { 832 APPLY_Y_PREDICTOR_24(); 833 OUTPUT_PIXEL_PAIR(); 834 APPLY_Y_PREDICTOR_24(); 835 OUTPUT_PIXEL_PAIR(); 836 } 837 break; 838 } 839 840 } else { 841 842 /* skip (copy) four pixels, but reassign the horizontal 843 * predictor */ 844 *vert_pred++ = *current_pixel_pair++; 845 horiz_pred = *current_pixel_pair - *vert_pred; 846 *vert_pred++ = *current_pixel_pair++; 847 848 } 849 850 if (!keyframe) { 851 mb_change_byte_mask <<= 1; 852 853 /* next byte */ 854 if (!mb_change_byte_mask) { 855 mb_change_byte = mb_change_bits[mb_change_index++]; 856 mb_change_byte_mask = 0x01; 857 } 858 } 859 860 pixels_left -= 2; 861 } 862 863 /* next change row */ 864 if (((y + 1) & 3) == 0) 865 mb_change_bits += s->mb_change_bits_row_size; 866 867 current_line += s->frame->linesize[0]; 868 } 869} 870 871 872static int truemotion1_decode_frame(AVCodecContext *avctx, AVFrame *rframe, 873 int *got_frame, AVPacket *avpkt) 874{ 875 const uint8_t *buf = avpkt->data; 876 int ret, buf_size = avpkt->size; 877 TrueMotion1Context *s = avctx->priv_data; 878 879 s->buf = buf; 880 s->size = buf_size; 881 882 if ((ret = truemotion1_decode_header(s)) < 0) 883 return ret; 884 885 if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0) 886 return ret; 887 888 if (compression_types[s->compression].algorithm == ALGO_RGB24H) { 889 truemotion1_decode_24bit(s); 890 } else if (compression_types[s->compression].algorithm != ALGO_NOP) { 891 truemotion1_decode_16bit(s); 892 } 893 894 if ((ret = av_frame_ref(rframe, s->frame)) < 0) 895 return ret; 896 897 *got_frame = 1; 898 899 /* report that the buffer was completely consumed */ 900 return buf_size; 901} 902 903static av_cold int truemotion1_decode_end(AVCodecContext *avctx) 904{ 905 TrueMotion1Context *s = avctx->priv_data; 906 907 av_frame_free(&s->frame); 908 av_freep(&s->vert_pred); 909 910 return 0; 911} 912 913const FFCodec ff_truemotion1_decoder = { 914 .p.name = "truemotion1", 915 .p.long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"), 916 .p.type = AVMEDIA_TYPE_VIDEO, 917 .p.id = AV_CODEC_ID_TRUEMOTION1, 918 .priv_data_size = sizeof(TrueMotion1Context), 919 .init = truemotion1_decode_init, 920 .close = truemotion1_decode_end, 921 FF_CODEC_DECODE_CB(truemotion1_decode_frame), 922 .p.capabilities = AV_CODEC_CAP_DR1, 923 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP, 924}; 925