1/* 2 * Duck TrueMotion 1.0 Decoder 3 * Copyright (C) 2003 Alex Beregszaszi & Mike Melanson 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; 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 "dsputil.h" 38#include "libavutil/imgutils.h" 39 40#include "truemotion1data.h" 41 42typedef struct TrueMotion1Context { 43 AVCodecContext *avctx; 44 AVFrame frame; 45 46 const uint8_t *buf; 47 int size; 48 49 const uint8_t *mb_change_bits; 50 int mb_change_bits_row_size; 51 const uint8_t *index_stream; 52 int index_stream_size; 53 54 int flags; 55 int x, y, w, h; 56 57 uint32_t y_predictor_table[1024]; 58 uint32_t c_predictor_table[1024]; 59 uint32_t fat_y_predictor_table[1024]; 60 uint32_t fat_c_predictor_table[1024]; 61 62 int compression; 63 int block_type; 64 int block_width; 65 int block_height; 66 67 int16_t ydt[8]; 68 int16_t cdt[8]; 69 int16_t fat_ydt[8]; 70 int16_t fat_cdt[8]; 71 72 int last_deltaset, last_vectable; 73 74 unsigned int *vert_pred; 75 int vert_pred_size; 76 77} TrueMotion1Context; 78 79#define FLAG_SPRITE 32 80#define FLAG_KEYFRAME 16 81#define FLAG_INTERFRAME 8 82#define FLAG_INTERPOLATED 4 83 84struct frame_header { 85 uint8_t header_size; 86 uint8_t compression; 87 uint8_t deltaset; 88 uint8_t vectable; 89 uint16_t ysize; 90 uint16_t xsize; 91 uint16_t checksum; 92 uint8_t version; 93 uint8_t header_type; 94 uint8_t flags; 95 uint8_t control; 96 uint16_t xoffset; 97 uint16_t yoffset; 98 uint16_t width; 99 uint16_t height; 100}; 101 102#define ALGO_NOP 0 103#define ALGO_RGB16V 1 104#define ALGO_RGB16H 2 105#define ALGO_RGB24H 3 106 107/* these are the various block sizes that can occupy a 4x4 block */ 108#define BLOCK_2x2 0 109#define BLOCK_2x4 1 110#define BLOCK_4x2 2 111#define BLOCK_4x4 3 112 113typedef struct comp_types { 114 int algorithm; 115 int block_width; // vres 116 int block_height; // hres 117 int block_type; 118} comp_types; 119 120/* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */ 121static const comp_types compression_types[17] = { 122 { ALGO_NOP, 0, 0, 0 }, 123 124 { ALGO_RGB16V, 4, 4, BLOCK_4x4 }, 125 { ALGO_RGB16H, 4, 4, BLOCK_4x4 }, 126 { ALGO_RGB16V, 4, 2, BLOCK_4x2 }, 127 { ALGO_RGB16H, 4, 2, BLOCK_4x2 }, 128 129 { ALGO_RGB16V, 2, 4, BLOCK_2x4 }, 130 { ALGO_RGB16H, 2, 4, BLOCK_2x4 }, 131 { ALGO_RGB16V, 2, 2, BLOCK_2x2 }, 132 { ALGO_RGB16H, 2, 2, BLOCK_2x2 }, 133 134 { ALGO_NOP, 4, 4, BLOCK_4x4 }, 135 { ALGO_RGB24H, 4, 4, BLOCK_4x4 }, 136 { ALGO_NOP, 4, 2, BLOCK_4x2 }, 137 { ALGO_RGB24H, 4, 2, BLOCK_4x2 }, 138 139 { ALGO_NOP, 2, 4, BLOCK_2x4 }, 140 { ALGO_RGB24H, 2, 4, BLOCK_2x4 }, 141 { ALGO_NOP, 2, 2, BLOCK_2x2 }, 142 { ALGO_RGB24H, 2, 2, BLOCK_2x2 } 143}; 144 145static void select_delta_tables(TrueMotion1Context *s, int delta_table_index) 146{ 147 int i; 148 149 if (delta_table_index > 3) 150 return; 151 152 memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t)); 153 memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t)); 154 memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t)); 155 memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t)); 156 157 /* Y skinny deltas need to be halved for some reason; maybe the 158 * skinny Y deltas should be modified */ 159 for (i = 0; i < 8; i++) 160 { 161 /* drop the lsb before dividing by 2-- net effect: round down 162 * when dividing a negative number (e.g., -3/2 = -2, not -1) */ 163 s->ydt[i] &= 0xFFFE; 164 s->ydt[i] /= 2; 165 } 166} 167 168#if HAVE_BIGENDIAN 169static int make_ydt15_entry(int p2, int p1, int16_t *ydt) 170#else 171static int make_ydt15_entry(int p1, int p2, int16_t *ydt) 172#endif 173{ 174 int lo, hi; 175 176 lo = ydt[p1]; 177 lo += (lo << 5) + (lo << 10); 178 hi = ydt[p2]; 179 hi += (hi << 5) + (hi << 10); 180 return (lo + (hi << 16)) << 1; 181} 182 183static int make_cdt15_entry(int p1, int p2, int16_t *cdt) 184{ 185 int r, b, lo; 186 187 b = cdt[p2]; 188 r = cdt[p1] << 10; 189 lo = b + r; 190 return (lo + (lo << 16)) << 1; 191} 192 193#if HAVE_BIGENDIAN 194static int make_ydt16_entry(int p2, int p1, int16_t *ydt) 195#else 196static int make_ydt16_entry(int p1, int p2, int16_t *ydt) 197#endif 198{ 199 int lo, hi; 200 201 lo = ydt[p1]; 202 lo += (lo << 6) + (lo << 11); 203 hi = ydt[p2]; 204 hi += (hi << 6) + (hi << 11); 205 return (lo + (hi << 16)) << 1; 206} 207 208static int make_cdt16_entry(int p1, int p2, int16_t *cdt) 209{ 210 int r, b, lo; 211 212 b = cdt[p2]; 213 r = cdt[p1] << 11; 214 lo = b + r; 215 return (lo + (lo << 16)) << 1; 216} 217 218static int make_ydt24_entry(int p1, int p2, int16_t *ydt) 219{ 220 int lo, hi; 221 222 lo = ydt[p1]; 223 hi = ydt[p2]; 224 return (lo + (hi << 8) + (hi << 16)) << 1; 225} 226 227static int make_cdt24_entry(int p1, int p2, int16_t *cdt) 228{ 229 int r, b; 230 231 b = cdt[p2]; 232 r = cdt[p1]<<16; 233 return (b+r) << 1; 234} 235 236static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table) 237{ 238 int len, i, j; 239 unsigned char delta_pair; 240 241 for (i = 0; i < 1024; i += 4) 242 { 243 len = *sel_vector_table++ / 2; 244 for (j = 0; j < len; j++) 245 { 246 delta_pair = *sel_vector_table++; 247 s->y_predictor_table[i+j] = 0xfffffffe & 248 make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt); 249 s->c_predictor_table[i+j] = 0xfffffffe & 250 make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt); 251 } 252 s->y_predictor_table[i+(j-1)] |= 1; 253 s->c_predictor_table[i+(j-1)] |= 1; 254 } 255} 256 257static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table) 258{ 259 int len, i, j; 260 unsigned char delta_pair; 261 262 for (i = 0; i < 1024; i += 4) 263 { 264 len = *sel_vector_table++ / 2; 265 for (j = 0; j < len; j++) 266 { 267 delta_pair = *sel_vector_table++; 268 s->y_predictor_table[i+j] = 0xfffffffe & 269 make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt); 270 s->c_predictor_table[i+j] = 0xfffffffe & 271 make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt); 272 } 273 s->y_predictor_table[i+(j-1)] |= 1; 274 s->c_predictor_table[i+(j-1)] |= 1; 275 } 276} 277 278static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table) 279{ 280 int len, i, j; 281 unsigned char delta_pair; 282 283 for (i = 0; i < 1024; i += 4) 284 { 285 len = *sel_vector_table++ / 2; 286 for (j = 0; j < len; j++) 287 { 288 delta_pair = *sel_vector_table++; 289 s->y_predictor_table[i+j] = 0xfffffffe & 290 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt); 291 s->c_predictor_table[i+j] = 0xfffffffe & 292 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt); 293 s->fat_y_predictor_table[i+j] = 0xfffffffe & 294 make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt); 295 s->fat_c_predictor_table[i+j] = 0xfffffffe & 296 make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt); 297 } 298 s->y_predictor_table[i+(j-1)] |= 1; 299 s->c_predictor_table[i+(j-1)] |= 1; 300 s->fat_y_predictor_table[i+(j-1)] |= 1; 301 s->fat_c_predictor_table[i+(j-1)] |= 1; 302 } 303} 304 305/* Returns the number of bytes consumed from the bytestream. Returns -1 if 306 * there was an error while decoding the header */ 307static int truemotion1_decode_header(TrueMotion1Context *s) 308{ 309 int i; 310 int width_shift = 0; 311 int new_pix_fmt; 312 struct frame_header header; 313 uint8_t header_buffer[128]; /* logical maximum size of the header */ 314 const uint8_t *sel_vector_table; 315 316 header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f; 317 if (s->buf[0] < 0x10) 318 { 319 av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]); 320 return -1; 321 } 322 323 /* unscramble the header bytes with a XOR operation */ 324 memset(header_buffer, 0, 128); 325 for (i = 1; i < header.header_size; i++) 326 header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1]; 327 328 header.compression = header_buffer[0]; 329 header.deltaset = header_buffer[1]; 330 header.vectable = header_buffer[2]; 331 header.ysize = AV_RL16(&header_buffer[3]); 332 header.xsize = AV_RL16(&header_buffer[5]); 333 header.checksum = AV_RL16(&header_buffer[7]); 334 header.version = header_buffer[9]; 335 header.header_type = header_buffer[10]; 336 header.flags = header_buffer[11]; 337 header.control = header_buffer[12]; 338 339 /* Version 2 */ 340 if (header.version >= 2) 341 { 342 if (header.header_type > 3) 343 { 344 av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type); 345 return -1; 346 } else if ((header.header_type == 2) || (header.header_type == 3)) { 347 s->flags = header.flags; 348 if (!(s->flags & FLAG_INTERFRAME)) 349 s->flags |= FLAG_KEYFRAME; 350 } else 351 s->flags = FLAG_KEYFRAME; 352 } else /* Version 1 */ 353 s->flags = FLAG_KEYFRAME; 354 355 if (s->flags & FLAG_SPRITE) { 356 av_log_ask_for_sample(s->avctx, "SPRITE frame found.\n"); 357 /* FIXME header.width, height, xoffset and yoffset aren't initialized */ 358#if 0 359 s->w = header.width; 360 s->h = header.height; 361 s->x = header.xoffset; 362 s->y = header.yoffset; 363#else 364 return -1; 365#endif 366 } else { 367 s->w = header.xsize; 368 s->h = header.ysize; 369 if (header.header_type < 2) { 370 if ((s->w < 213) && (s->h >= 176)) 371 { 372 s->flags |= FLAG_INTERPOLATED; 373 av_log_ask_for_sample(s->avctx, "INTERPOLATION selected.\n"); 374 } 375 } 376 } 377 378 if (header.compression >= 17) { 379 av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression); 380 return -1; 381 } 382 383 if ((header.deltaset != s->last_deltaset) || 384 (header.vectable != s->last_vectable)) 385 select_delta_tables(s, header.deltaset); 386 387 if ((header.compression & 1) && header.header_type) 388 sel_vector_table = pc_tbl2; 389 else { 390 if (header.vectable > 0 && header.vectable < 4) 391 sel_vector_table = tables[header.vectable - 1]; 392 else { 393 av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable); 394 return -1; 395 } 396 } 397 398 if (compression_types[header.compression].algorithm == ALGO_RGB24H) { 399 new_pix_fmt = PIX_FMT_RGB32; 400 width_shift = 1; 401 } else 402 new_pix_fmt = PIX_FMT_RGB555; // RGB565 is supported as well 403 404 s->w >>= width_shift; 405 if (av_image_check_size(s->w, s->h, 0, s->avctx) < 0) 406 return -1; 407 408 if (s->w != s->avctx->width || s->h != s->avctx->height || 409 new_pix_fmt != s->avctx->pix_fmt) { 410 if (s->frame.data[0]) 411 s->avctx->release_buffer(s->avctx, &s->frame); 412 s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 }; 413 s->avctx->pix_fmt = new_pix_fmt; 414 avcodec_set_dimensions(s->avctx, s->w, s->h); 415 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int)); 416 } 417 418 /* There is 1 change bit per 4 pixels, so each change byte represents 419 * 32 pixels; divide width by 4 to obtain the number of change bits and 420 * then round up to the nearest byte. */ 421 s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3; 422 423 if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable)) 424 { 425 if (compression_types[header.compression].algorithm == ALGO_RGB24H) 426 gen_vector_table24(s, sel_vector_table); 427 else 428 if (s->avctx->pix_fmt == PIX_FMT_RGB555) 429 gen_vector_table15(s, sel_vector_table); 430 else 431 gen_vector_table16(s, sel_vector_table); 432 } 433 434 /* set up pointers to the other key data chunks */ 435 s->mb_change_bits = s->buf + header.header_size; 436 if (s->flags & FLAG_KEYFRAME) { 437 /* no change bits specified for a keyframe; only index bytes */ 438 s->index_stream = s->mb_change_bits; 439 } else { 440 /* one change bit per 4x4 block */ 441 s->index_stream = s->mb_change_bits + 442 (s->mb_change_bits_row_size * (s->avctx->height >> 2)); 443 } 444 s->index_stream_size = s->size - (s->index_stream - s->buf); 445 446 s->last_deltaset = header.deltaset; 447 s->last_vectable = header.vectable; 448 s->compression = header.compression; 449 s->block_width = compression_types[header.compression].block_width; 450 s->block_height = compression_types[header.compression].block_height; 451 s->block_type = compression_types[header.compression].block_type; 452 453 if (s->avctx->debug & FF_DEBUG_PICT_INFO) 454 av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n", 455 s->last_deltaset, s->last_vectable, s->compression, s->block_width, 456 s->block_height, s->block_type, 457 s->flags & FLAG_KEYFRAME ? " KEY" : "", 458 s->flags & FLAG_INTERFRAME ? " INTER" : "", 459 s->flags & FLAG_SPRITE ? " SPRITE" : "", 460 s->flags & FLAG_INTERPOLATED ? " INTERPOL" : ""); 461 462 return header.header_size; 463} 464 465static av_cold int truemotion1_decode_init(AVCodecContext *avctx) 466{ 467 TrueMotion1Context *s = avctx->priv_data; 468 469 s->avctx = avctx; 470 471 // FIXME: it may change ? 472// if (avctx->bits_per_sample == 24) 473// avctx->pix_fmt = PIX_FMT_RGB24; 474// else 475// avctx->pix_fmt = PIX_FMT_RGB555; 476 477 s->frame.data[0] = NULL; 478 479 /* there is a vertical predictor for each pixel in a line; each vertical 480 * predictor is 0 to start with */ 481 av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int)); 482 483 return 0; 484} 485 486/* 487Block decoding order: 488 489dxi: Y-Y 490dxic: Y-C-Y 491dxic2: Y-C-Y-C 492 493hres,vres,i,i%vres (0 < i < 4) 4942x2 0: 0 dxic2 4952x2 1: 1 dxi 4962x2 2: 0 dxic2 4972x2 3: 1 dxi 4982x4 0: 0 dxic2 4992x4 1: 1 dxi 5002x4 2: 2 dxi 5012x4 3: 3 dxi 5024x2 0: 0 dxic 5034x2 1: 1 dxi 5044x2 2: 0 dxic 5054x2 3: 1 dxi 5064x4 0: 0 dxic 5074x4 1: 1 dxi 5084x4 2: 2 dxi 5094x4 3: 3 dxi 510*/ 511 512#define GET_NEXT_INDEX() \ 513{\ 514 if (index_stream_index >= s->index_stream_size) { \ 515 av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \ 516 return; \ 517 } \ 518 index = s->index_stream[index_stream_index++] * 4; \ 519} 520 521#define APPLY_C_PREDICTOR() \ 522 predictor_pair = s->c_predictor_table[index]; \ 523 horiz_pred += (predictor_pair >> 1); \ 524 if (predictor_pair & 1) { \ 525 GET_NEXT_INDEX() \ 526 if (!index) { \ 527 GET_NEXT_INDEX() \ 528 predictor_pair = s->c_predictor_table[index]; \ 529 horiz_pred += ((predictor_pair >> 1) * 5); \ 530 if (predictor_pair & 1) \ 531 GET_NEXT_INDEX() \ 532 else \ 533 index++; \ 534 } \ 535 } else \ 536 index++; 537 538#define APPLY_C_PREDICTOR_24() \ 539 predictor_pair = s->c_predictor_table[index]; \ 540 horiz_pred += (predictor_pair >> 1); \ 541 if (predictor_pair & 1) { \ 542 GET_NEXT_INDEX() \ 543 if (!index) { \ 544 GET_NEXT_INDEX() \ 545 predictor_pair = s->fat_c_predictor_table[index]; \ 546 horiz_pred += (predictor_pair >> 1); \ 547 if (predictor_pair & 1) \ 548 GET_NEXT_INDEX() \ 549 else \ 550 index++; \ 551 } \ 552 } else \ 553 index++; 554 555 556#define APPLY_Y_PREDICTOR() \ 557 predictor_pair = s->y_predictor_table[index]; \ 558 horiz_pred += (predictor_pair >> 1); \ 559 if (predictor_pair & 1) { \ 560 GET_NEXT_INDEX() \ 561 if (!index) { \ 562 GET_NEXT_INDEX() \ 563 predictor_pair = s->y_predictor_table[index]; \ 564 horiz_pred += ((predictor_pair >> 1) * 5); \ 565 if (predictor_pair & 1) \ 566 GET_NEXT_INDEX() \ 567 else \ 568 index++; \ 569 } \ 570 } else \ 571 index++; 572 573#define APPLY_Y_PREDICTOR_24() \ 574 predictor_pair = s->y_predictor_table[index]; \ 575 horiz_pred += (predictor_pair >> 1); \ 576 if (predictor_pair & 1) { \ 577 GET_NEXT_INDEX() \ 578 if (!index) { \ 579 GET_NEXT_INDEX() \ 580 predictor_pair = s->fat_y_predictor_table[index]; \ 581 horiz_pred += (predictor_pair >> 1); \ 582 if (predictor_pair & 1) \ 583 GET_NEXT_INDEX() \ 584 else \ 585 index++; \ 586 } \ 587 } else \ 588 index++; 589 590#define OUTPUT_PIXEL_PAIR() \ 591 *current_pixel_pair = *vert_pred + horiz_pred; \ 592 *vert_pred++ = *current_pixel_pair++; 593 594static void truemotion1_decode_16bit(TrueMotion1Context *s) 595{ 596 int y; 597 int pixels_left; /* remaining pixels on this line */ 598 unsigned int predictor_pair; 599 unsigned int horiz_pred; 600 unsigned int *vert_pred; 601 unsigned int *current_pixel_pair; 602 unsigned char *current_line = s->frame.data[0]; 603 int keyframe = s->flags & FLAG_KEYFRAME; 604 605 /* these variables are for managing the stream of macroblock change bits */ 606 const unsigned char *mb_change_bits = s->mb_change_bits; 607 unsigned char mb_change_byte; 608 unsigned char mb_change_byte_mask; 609 int mb_change_index; 610 611 /* these variables are for managing the main index stream */ 612 int index_stream_index = 0; /* yes, the index into the index stream */ 613 int index; 614 615 /* clean out the line buffer */ 616 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int)); 617 618 GET_NEXT_INDEX(); 619 620 for (y = 0; y < s->avctx->height; y++) { 621 622 /* re-init variables for the next line iteration */ 623 horiz_pred = 0; 624 current_pixel_pair = (unsigned int *)current_line; 625 vert_pred = s->vert_pred; 626 mb_change_index = 0; 627 mb_change_byte = mb_change_bits[mb_change_index++]; 628 mb_change_byte_mask = 0x01; 629 pixels_left = s->avctx->width; 630 631 while (pixels_left > 0) { 632 633 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) { 634 635 switch (y & 3) { 636 case 0: 637 /* if macroblock width is 2, apply C-Y-C-Y; else 638 * apply C-Y-Y */ 639 if (s->block_width == 2) { 640 APPLY_C_PREDICTOR(); 641 APPLY_Y_PREDICTOR(); 642 OUTPUT_PIXEL_PAIR(); 643 APPLY_C_PREDICTOR(); 644 APPLY_Y_PREDICTOR(); 645 OUTPUT_PIXEL_PAIR(); 646 } else { 647 APPLY_C_PREDICTOR(); 648 APPLY_Y_PREDICTOR(); 649 OUTPUT_PIXEL_PAIR(); 650 APPLY_Y_PREDICTOR(); 651 OUTPUT_PIXEL_PAIR(); 652 } 653 break; 654 655 case 1: 656 case 3: 657 /* always apply 2 Y predictors on these iterations */ 658 APPLY_Y_PREDICTOR(); 659 OUTPUT_PIXEL_PAIR(); 660 APPLY_Y_PREDICTOR(); 661 OUTPUT_PIXEL_PAIR(); 662 break; 663 664 case 2: 665 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y 666 * depending on the macroblock type */ 667 if (s->block_type == BLOCK_2x2) { 668 APPLY_C_PREDICTOR(); 669 APPLY_Y_PREDICTOR(); 670 OUTPUT_PIXEL_PAIR(); 671 APPLY_C_PREDICTOR(); 672 APPLY_Y_PREDICTOR(); 673 OUTPUT_PIXEL_PAIR(); 674 } else if (s->block_type == BLOCK_4x2) { 675 APPLY_C_PREDICTOR(); 676 APPLY_Y_PREDICTOR(); 677 OUTPUT_PIXEL_PAIR(); 678 APPLY_Y_PREDICTOR(); 679 OUTPUT_PIXEL_PAIR(); 680 } else { 681 APPLY_Y_PREDICTOR(); 682 OUTPUT_PIXEL_PAIR(); 683 APPLY_Y_PREDICTOR(); 684 OUTPUT_PIXEL_PAIR(); 685 } 686 break; 687 } 688 689 } else { 690 691 /* skip (copy) four pixels, but reassign the horizontal 692 * predictor */ 693 *vert_pred++ = *current_pixel_pair++; 694 horiz_pred = *current_pixel_pair - *vert_pred; 695 *vert_pred++ = *current_pixel_pair++; 696 697 } 698 699 if (!keyframe) { 700 mb_change_byte_mask <<= 1; 701 702 /* next byte */ 703 if (!mb_change_byte_mask) { 704 mb_change_byte = mb_change_bits[mb_change_index++]; 705 mb_change_byte_mask = 0x01; 706 } 707 } 708 709 pixels_left -= 4; 710 } 711 712 /* next change row */ 713 if (((y + 1) & 3) == 0) 714 mb_change_bits += s->mb_change_bits_row_size; 715 716 current_line += s->frame.linesize[0]; 717 } 718} 719 720static void truemotion1_decode_24bit(TrueMotion1Context *s) 721{ 722 int y; 723 int pixels_left; /* remaining pixels on this line */ 724 unsigned int predictor_pair; 725 unsigned int horiz_pred; 726 unsigned int *vert_pred; 727 unsigned int *current_pixel_pair; 728 unsigned char *current_line = s->frame.data[0]; 729 int keyframe = s->flags & FLAG_KEYFRAME; 730 731 /* these variables are for managing the stream of macroblock change bits */ 732 const unsigned char *mb_change_bits = s->mb_change_bits; 733 unsigned char mb_change_byte; 734 unsigned char mb_change_byte_mask; 735 int mb_change_index; 736 737 /* these variables are for managing the main index stream */ 738 int index_stream_index = 0; /* yes, the index into the index stream */ 739 int index; 740 741 /* clean out the line buffer */ 742 memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int)); 743 744 GET_NEXT_INDEX(); 745 746 for (y = 0; y < s->avctx->height; y++) { 747 748 /* re-init variables for the next line iteration */ 749 horiz_pred = 0; 750 current_pixel_pair = (unsigned int *)current_line; 751 vert_pred = s->vert_pred; 752 mb_change_index = 0; 753 mb_change_byte = mb_change_bits[mb_change_index++]; 754 mb_change_byte_mask = 0x01; 755 pixels_left = s->avctx->width; 756 757 while (pixels_left > 0) { 758 759 if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) { 760 761 switch (y & 3) { 762 case 0: 763 /* if macroblock width is 2, apply C-Y-C-Y; else 764 * apply C-Y-Y */ 765 if (s->block_width == 2) { 766 APPLY_C_PREDICTOR_24(); 767 APPLY_Y_PREDICTOR_24(); 768 OUTPUT_PIXEL_PAIR(); 769 APPLY_C_PREDICTOR_24(); 770 APPLY_Y_PREDICTOR_24(); 771 OUTPUT_PIXEL_PAIR(); 772 } else { 773 APPLY_C_PREDICTOR_24(); 774 APPLY_Y_PREDICTOR_24(); 775 OUTPUT_PIXEL_PAIR(); 776 APPLY_Y_PREDICTOR_24(); 777 OUTPUT_PIXEL_PAIR(); 778 } 779 break; 780 781 case 1: 782 case 3: 783 /* always apply 2 Y predictors on these iterations */ 784 APPLY_Y_PREDICTOR_24(); 785 OUTPUT_PIXEL_PAIR(); 786 APPLY_Y_PREDICTOR_24(); 787 OUTPUT_PIXEL_PAIR(); 788 break; 789 790 case 2: 791 /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y 792 * depending on the macroblock type */ 793 if (s->block_type == BLOCK_2x2) { 794 APPLY_C_PREDICTOR_24(); 795 APPLY_Y_PREDICTOR_24(); 796 OUTPUT_PIXEL_PAIR(); 797 APPLY_C_PREDICTOR_24(); 798 APPLY_Y_PREDICTOR_24(); 799 OUTPUT_PIXEL_PAIR(); 800 } else if (s->block_type == BLOCK_4x2) { 801 APPLY_C_PREDICTOR_24(); 802 APPLY_Y_PREDICTOR_24(); 803 OUTPUT_PIXEL_PAIR(); 804 APPLY_Y_PREDICTOR_24(); 805 OUTPUT_PIXEL_PAIR(); 806 } else { 807 APPLY_Y_PREDICTOR_24(); 808 OUTPUT_PIXEL_PAIR(); 809 APPLY_Y_PREDICTOR_24(); 810 OUTPUT_PIXEL_PAIR(); 811 } 812 break; 813 } 814 815 } else { 816 817 /* skip (copy) four pixels, but reassign the horizontal 818 * predictor */ 819 *vert_pred++ = *current_pixel_pair++; 820 horiz_pred = *current_pixel_pair - *vert_pred; 821 *vert_pred++ = *current_pixel_pair++; 822 823 } 824 825 if (!keyframe) { 826 mb_change_byte_mask <<= 1; 827 828 /* next byte */ 829 if (!mb_change_byte_mask) { 830 mb_change_byte = mb_change_bits[mb_change_index++]; 831 mb_change_byte_mask = 0x01; 832 } 833 } 834 835 pixels_left -= 2; 836 } 837 838 /* next change row */ 839 if (((y + 1) & 3) == 0) 840 mb_change_bits += s->mb_change_bits_row_size; 841 842 current_line += s->frame.linesize[0]; 843 } 844} 845 846 847static int truemotion1_decode_frame(AVCodecContext *avctx, 848 void *data, int *data_size, 849 AVPacket *avpkt) 850{ 851 const uint8_t *buf = avpkt->data; 852 int buf_size = avpkt->size; 853 TrueMotion1Context *s = avctx->priv_data; 854 855 s->buf = buf; 856 s->size = buf_size; 857 858 if (truemotion1_decode_header(s) == -1) 859 return -1; 860 861 s->frame.reference = 1; 862 s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | 863 FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; 864 if (avctx->reget_buffer(avctx, &s->frame) < 0) { 865 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 866 return -1; 867 } 868 869 if (compression_types[s->compression].algorithm == ALGO_RGB24H) { 870 truemotion1_decode_24bit(s); 871 } else if (compression_types[s->compression].algorithm != ALGO_NOP) { 872 truemotion1_decode_16bit(s); 873 } 874 875 *data_size = sizeof(AVFrame); 876 *(AVFrame*)data = s->frame; 877 878 /* report that the buffer was completely consumed */ 879 return buf_size; 880} 881 882static av_cold int truemotion1_decode_end(AVCodecContext *avctx) 883{ 884 TrueMotion1Context *s = avctx->priv_data; 885 886 if (s->frame.data[0]) 887 avctx->release_buffer(avctx, &s->frame); 888 889 av_free(s->vert_pred); 890 891 return 0; 892} 893 894AVCodec ff_truemotion1_decoder = { 895 .name = "truemotion1", 896 .type = AVMEDIA_TYPE_VIDEO, 897 .id = CODEC_ID_TRUEMOTION1, 898 .priv_data_size = sizeof(TrueMotion1Context), 899 .init = truemotion1_decode_init, 900 .close = truemotion1_decode_end, 901 .decode = truemotion1_decode_frame, 902 .capabilities = CODEC_CAP_DR1, 903 .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"), 904}; 905