| 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 "internal.h" |
| 38 | #include "libavutil/imgutils.h" |
| 39 | #include "libavutil/internal.h" |
| 40 | #include "libavutil/intreadwrite.h" |
| 41 | #include "libavutil/mem.h" |
| 42 | |
| 43 | #include "truemotion1data.h" |
| 44 | |
| 45 | typedef struct TrueMotion1Context { |
| 46 | AVCodecContext *avctx; |
| 47 | AVFrame *frame; |
| 48 | |
| 49 | const uint8_t *buf; |
| 50 | int size; |
| 51 | |
| 52 | const uint8_t *mb_change_bits; |
| 53 | int mb_change_bits_row_size; |
| 54 | const uint8_t *index_stream; |
| 55 | int index_stream_size; |
| 56 | |
| 57 | int flags; |
| 58 | int x, y, w, h; |
| 59 | |
| 60 | uint32_t y_predictor_table[1024]; |
| 61 | uint32_t c_predictor_table[1024]; |
| 62 | uint32_t fat_y_predictor_table[1024]; |
| 63 | uint32_t fat_c_predictor_table[1024]; |
| 64 | |
| 65 | int compression; |
| 66 | int block_type; |
| 67 | int block_width; |
| 68 | int block_height; |
| 69 | |
| 70 | int16_t ydt[8]; |
| 71 | int16_t cdt[8]; |
| 72 | int16_t fat_ydt[8]; |
| 73 | int16_t fat_cdt[8]; |
| 74 | |
| 75 | int last_deltaset, last_vectable; |
| 76 | |
| 77 | unsigned int *vert_pred; |
| 78 | int vert_pred_size; |
| 79 | |
| 80 | } TrueMotion1Context; |
| 81 | |
| 82 | #define FLAG_SPRITE 32 |
| 83 | #define FLAG_KEYFRAME 16 |
| 84 | #define FLAG_INTERFRAME 8 |
| 85 | #define FLAG_INTERPOLATED 4 |
| 86 | |
| 87 | struct frame_header { |
| 88 | uint8_t header_size; |
| 89 | uint8_t compression; |
| 90 | uint8_t deltaset; |
| 91 | uint8_t vectable; |
| 92 | uint16_t ysize; |
| 93 | uint16_t xsize; |
| 94 | uint16_t checksum; |
| 95 | uint8_t version; |
| 96 | uint8_t header_type; |
| 97 | uint8_t flags; |
| 98 | uint8_t control; |
| 99 | uint16_t xoffset; |
| 100 | uint16_t yoffset; |
| 101 | uint16_t width; |
| 102 | uint16_t height; |
| 103 | }; |
| 104 | |
| 105 | #define ALGO_NOP 0 |
| 106 | #define ALGO_RGB16V 1 |
| 107 | #define ALGO_RGB16H 2 |
| 108 | #define ALGO_RGB24H 3 |
| 109 | |
| 110 | /* these are the various block sizes that can occupy a 4x4 block */ |
| 111 | #define BLOCK_2x2 0 |
| 112 | #define BLOCK_2x4 1 |
| 113 | #define BLOCK_4x2 2 |
| 114 | #define BLOCK_4x4 3 |
| 115 | |
| 116 | typedef struct comp_types { |
| 117 | int algorithm; |
| 118 | int block_width; // vres |
| 119 | int block_height; // hres |
| 120 | int block_type; |
| 121 | } comp_types; |
| 122 | |
| 123 | /* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */ |
| 124 | static const comp_types compression_types[17] = { |
| 125 | { ALGO_NOP, 0, 0, 0 }, |
| 126 | |
| 127 | { ALGO_RGB16V, 4, 4, BLOCK_4x4 }, |
| 128 | { ALGO_RGB16H, 4, 4, BLOCK_4x4 }, |
| 129 | { ALGO_RGB16V, 4, 2, BLOCK_4x2 }, |
| 130 | { ALGO_RGB16H, 4, 2, BLOCK_4x2 }, |
| 131 | |
| 132 | { ALGO_RGB16V, 2, 4, BLOCK_2x4 }, |
| 133 | { ALGO_RGB16H, 2, 4, BLOCK_2x4 }, |
| 134 | { ALGO_RGB16V, 2, 2, BLOCK_2x2 }, |
| 135 | { ALGO_RGB16H, 2, 2, BLOCK_2x2 }, |
| 136 | |
| 137 | { ALGO_NOP, 4, 4, BLOCK_4x4 }, |
| 138 | { ALGO_RGB24H, 4, 4, BLOCK_4x4 }, |
| 139 | { ALGO_NOP, 4, 2, BLOCK_4x2 }, |
| 140 | { ALGO_RGB24H, 4, 2, BLOCK_4x2 }, |
| 141 | |
| 142 | { ALGO_NOP, 2, 4, BLOCK_2x4 }, |
| 143 | { ALGO_RGB24H, 2, 4, BLOCK_2x4 }, |
| 144 | { ALGO_NOP, 2, 2, BLOCK_2x2 }, |
| 145 | { ALGO_RGB24H, 2, 2, BLOCK_2x2 } |
| 146 | }; |
| 147 | |
| 148 | static void select_delta_tables(TrueMotion1Context *s, int delta_table_index) |
| 149 | { |
| 150 | int i; |
| 151 | |
| 152 | if (delta_table_index > 3) |
| 153 | return; |
| 154 | |
| 155 | memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t)); |
| 156 | memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t)); |
| 157 | memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t)); |
| 158 | memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t)); |
| 159 | |
| 160 | /* Y skinny deltas need to be halved for some reason; maybe the |
| 161 | * skinny Y deltas should be modified */ |
| 162 | for (i = 0; i < 8; i++) |
| 163 | { |
| 164 | /* drop the lsb before dividing by 2-- net effect: round down |
| 165 | * when dividing a negative number (e.g., -3/2 = -2, not -1) */ |
| 166 | s->ydt[i] &= 0xFFFE; |
| 167 | s->ydt[i] /= 2; |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | #if HAVE_BIGENDIAN |
| 172 | static int make_ydt15_entry(int p2, int p1, int16_t *ydt) |
| 173 | #else |
| 174 | static int make_ydt15_entry(int p1, int p2, int16_t *ydt) |
| 175 | #endif |
| 176 | { |
| 177 | int lo, hi; |
| 178 | |
| 179 | lo = ydt[p1]; |
| 180 | lo += (lo << 5) + (lo << 10); |
| 181 | hi = ydt[p2]; |
| 182 | hi += (hi << 5) + (hi << 10); |
| 183 | return (lo + (hi << 16)) << 1; |
| 184 | } |
| 185 | |
| 186 | static int make_cdt15_entry(int p1, int p2, int16_t *cdt) |
| 187 | { |
| 188 | int r, b, lo; |
| 189 | |
| 190 | b = cdt[p2]; |
| 191 | r = cdt[p1] << 10; |
| 192 | lo = b + r; |
| 193 | return (lo + (lo << 16)) << 1; |
| 194 | } |
| 195 | |
| 196 | #if HAVE_BIGENDIAN |
| 197 | static int make_ydt16_entry(int p2, int p1, int16_t *ydt) |
| 198 | #else |
| 199 | static int make_ydt16_entry(int p1, int p2, int16_t *ydt) |
| 200 | #endif |
| 201 | { |
| 202 | int lo, hi; |
| 203 | |
| 204 | lo = ydt[p1]; |
| 205 | lo += (lo << 6) + (lo << 11); |
| 206 | hi = ydt[p2]; |
| 207 | hi += (hi << 6) + (hi << 11); |
| 208 | return (lo + (hi << 16)) << 1; |
| 209 | } |
| 210 | |
| 211 | static int make_cdt16_entry(int p1, int p2, int16_t *cdt) |
| 212 | { |
| 213 | int r, b, lo; |
| 214 | |
| 215 | b = cdt[p2]; |
| 216 | r = cdt[p1] << 11; |
| 217 | lo = b + r; |
| 218 | return (lo + (lo << 16)) << 1; |
| 219 | } |
| 220 | |
| 221 | static int make_ydt24_entry(int p1, int p2, int16_t *ydt) |
| 222 | { |
| 223 | int lo, hi; |
| 224 | |
| 225 | lo = ydt[p1]; |
| 226 | hi = ydt[p2]; |
| 227 | return (lo + (hi << 8) + (hi << 16)) << 1; |
| 228 | } |
| 229 | |
| 230 | static int make_cdt24_entry(int p1, int p2, int16_t *cdt) |
| 231 | { |
| 232 | int r, b; |
| 233 | |
| 234 | b = cdt[p2]; |
| 235 | r = cdt[p1]<<16; |
| 236 | return (b+r) << 1; |
| 237 | } |
| 238 | |
| 239 | static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table) |
| 240 | { |
| 241 | int len, i, j; |
| 242 | unsigned char delta_pair; |
| 243 | |
| 244 | for (i = 0; i < 1024; i += 4) |
| 245 | { |
| 246 | len = *sel_vector_table++ / 2; |
| 247 | for (j = 0; j < len; j++) |
| 248 | { |
| 249 | delta_pair = *sel_vector_table++; |
| 250 | s->y_predictor_table[i+j] = 0xfffffffe & |
| 251 | make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt); |
| 252 | s->c_predictor_table[i+j] = 0xfffffffe & |
| 253 | make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt); |
| 254 | } |
| 255 | s->y_predictor_table[i+(j-1)] |= 1; |
| 256 | s->c_predictor_table[i+(j-1)] |= 1; |
| 257 | } |
| 258 | } |
| 259 | |
| 260 | static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table) |
| 261 | { |
| 262 | int len, i, j; |
| 263 | unsigned char delta_pair; |
| 264 | |
| 265 | for (i = 0; i < 1024; i += 4) |
| 266 | { |
| 267 | len = *sel_vector_table++ / 2; |
| 268 | for (j = 0; j < len; j++) |
| 269 | { |
| 270 | delta_pair = *sel_vector_table++; |
| 271 | s->y_predictor_table[i+j] = 0xfffffffe & |
| 272 | make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt); |
| 273 | s->c_predictor_table[i+j] = 0xfffffffe & |
| 274 | make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt); |
| 275 | } |
| 276 | s->y_predictor_table[i+(j-1)] |= 1; |
| 277 | s->c_predictor_table[i+(j-1)] |= 1; |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table) |
| 282 | { |
| 283 | int len, i, j; |
| 284 | unsigned char delta_pair; |
| 285 | |
| 286 | for (i = 0; i < 1024; i += 4) |
| 287 | { |
| 288 | len = *sel_vector_table++ / 2; |
| 289 | for (j = 0; j < len; j++) |
| 290 | { |
| 291 | delta_pair = *sel_vector_table++; |
| 292 | s->y_predictor_table[i+j] = 0xfffffffe & |
| 293 | make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt); |
| 294 | s->c_predictor_table[i+j] = 0xfffffffe & |
| 295 | make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt); |
| 296 | s->fat_y_predictor_table[i+j] = 0xfffffffe & |
| 297 | make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt); |
| 298 | s->fat_c_predictor_table[i+j] = 0xfffffffe & |
| 299 | make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt); |
| 300 | } |
| 301 | s->y_predictor_table[i+(j-1)] |= 1; |
| 302 | s->c_predictor_table[i+(j-1)] |= 1; |
| 303 | s->fat_y_predictor_table[i+(j-1)] |= 1; |
| 304 | s->fat_c_predictor_table[i+(j-1)] |= 1; |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | /* Returns the number of bytes consumed from the bytestream. Returns -1 if |
| 309 | * there was an error while decoding the header */ |
| 310 | static int truemotion1_decode_header(TrueMotion1Context *s) |
| 311 | { |
| 312 | int i, ret; |
| 313 | int width_shift = 0; |
| 314 | int new_pix_fmt; |
| 315 | struct frame_header header; |
| 316 | uint8_t header_buffer[128] = { 0 }; /* logical maximum size of the header */ |
| 317 | const uint8_t *sel_vector_table; |
| 318 | |
| 319 | header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f; |
| 320 | if (s->buf[0] < 0x10) |
| 321 | { |
| 322 | av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]); |
| 323 | return AVERROR_INVALIDDATA; |
| 324 | } |
| 325 | |
| 326 | if (header.header_size + 1 > s->size) { |
| 327 | av_log(s->avctx, AV_LOG_ERROR, "Input packet too small.\n"); |
| 328 | return AVERROR_INVALIDDATA; |
| 329 | } |
| 330 | |
| 331 | /* unscramble the header bytes with a XOR operation */ |
| 332 | for (i = 1; i < header.header_size; i++) |
| 333 | header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1]; |
| 334 | |
| 335 | header.compression = header_buffer[0]; |
| 336 | header.deltaset = header_buffer[1]; |
| 337 | header.vectable = header_buffer[2]; |
| 338 | header.ysize = AV_RL16(&header_buffer[3]); |
| 339 | header.xsize = AV_RL16(&header_buffer[5]); |
| 340 | header.checksum = AV_RL16(&header_buffer[7]); |
| 341 | header.version = header_buffer[9]; |
| 342 | header.header_type = header_buffer[10]; |
| 343 | header.flags = header_buffer[11]; |
| 344 | header.control = header_buffer[12]; |
| 345 | |
| 346 | /* Version 2 */ |
| 347 | if (header.version >= 2) |
| 348 | { |
| 349 | if (header.header_type > 3) |
| 350 | { |
| 351 | av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type); |
| 352 | return AVERROR_INVALIDDATA; |
| 353 | } else if ((header.header_type == 2) || (header.header_type == 3)) { |
| 354 | s->flags = header.flags; |
| 355 | if (!(s->flags & FLAG_INTERFRAME)) |
| 356 | s->flags |= FLAG_KEYFRAME; |
| 357 | } else |
| 358 | s->flags = FLAG_KEYFRAME; |
| 359 | } else /* Version 1 */ |
| 360 | s->flags = FLAG_KEYFRAME; |
| 361 | |
| 362 | if (s->flags & FLAG_SPRITE) { |
| 363 | avpriv_request_sample(s->avctx, "Frame with sprite"); |
| 364 | /* FIXME header.width, height, xoffset and yoffset aren't initialized */ |
| 365 | return AVERROR_PATCHWELCOME; |
| 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 | avpriv_request_sample(s->avctx, "Interpolated frame"); |
| 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 AVERROR_INVALIDDATA; |
| 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 AVERROR_INVALIDDATA; |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | if (compression_types[header.compression].algorithm == ALGO_RGB24H) { |
| 399 | new_pix_fmt = AV_PIX_FMT_RGB32; |
| 400 | width_shift = 1; |
| 401 | } else |
| 402 | new_pix_fmt = AV_PIX_FMT_RGB555; // RGB565 is supported as well |
| 403 | |
| 404 | s->w >>= width_shift; |
| 405 | |
| 406 | if (s->w != s->avctx->width || s->h != s->avctx->height || |
| 407 | new_pix_fmt != s->avctx->pix_fmt) { |
| 408 | av_frame_unref(s->frame); |
| 409 | s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 }; |
| 410 | s->avctx->pix_fmt = new_pix_fmt; |
| 411 | |
| 412 | if ((ret = ff_set_dimensions(s->avctx, s->w, s->h)) < 0) |
| 413 | return ret; |
| 414 | |
| 415 | ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio); |
| 416 | |
| 417 | av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int)); |
| 418 | if (!s->vert_pred) |
| 419 | return AVERROR(ENOMEM); |
| 420 | } |
| 421 | |
| 422 | /* There is 1 change bit per 4 pixels, so each change byte represents |
| 423 | * 32 pixels; divide width by 4 to obtain the number of change bits and |
| 424 | * then round up to the nearest byte. */ |
| 425 | s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3; |
| 426 | |
| 427 | if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable)) |
| 428 | { |
| 429 | if (compression_types[header.compression].algorithm == ALGO_RGB24H) |
| 430 | gen_vector_table24(s, sel_vector_table); |
| 431 | else |
| 432 | if (s->avctx->pix_fmt == AV_PIX_FMT_RGB555) |
| 433 | gen_vector_table15(s, sel_vector_table); |
| 434 | else |
| 435 | gen_vector_table16(s, sel_vector_table); |
| 436 | } |
| 437 | |
| 438 | /* set up pointers to the other key data chunks */ |
| 439 | s->mb_change_bits = s->buf + header.header_size; |
| 440 | if (s->flags & FLAG_KEYFRAME) { |
| 441 | /* no change bits specified for a keyframe; only index bytes */ |
| 442 | s->index_stream = s->mb_change_bits; |
| 443 | } else { |
| 444 | /* one change bit per 4x4 block */ |
| 445 | s->index_stream = s->mb_change_bits + |
| 446 | (s->mb_change_bits_row_size * (s->avctx->height >> 2)); |
| 447 | } |
| 448 | s->index_stream_size = s->size - (s->index_stream - s->buf); |
| 449 | |
| 450 | s->last_deltaset = header.deltaset; |
| 451 | s->last_vectable = header.vectable; |
| 452 | s->compression = header.compression; |
| 453 | s->block_width = compression_types[header.compression].block_width; |
| 454 | s->block_height = compression_types[header.compression].block_height; |
| 455 | s->block_type = compression_types[header.compression].block_type; |
| 456 | |
| 457 | if (s->avctx->debug & FF_DEBUG_PICT_INFO) |
| 458 | av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n", |
| 459 | s->last_deltaset, s->last_vectable, s->compression, s->block_width, |
| 460 | s->block_height, s->block_type, |
| 461 | s->flags & FLAG_KEYFRAME ? " KEY" : "", |
| 462 | s->flags & FLAG_INTERFRAME ? " INTER" : "", |
| 463 | s->flags & FLAG_SPRITE ? " SPRITE" : "", |
| 464 | s->flags & FLAG_INTERPOLATED ? " INTERPOL" : ""); |
| 465 | |
| 466 | return header.header_size; |
| 467 | } |
| 468 | |
| 469 | static av_cold int truemotion1_decode_init(AVCodecContext *avctx) |
| 470 | { |
| 471 | TrueMotion1Context *s = avctx->priv_data; |
| 472 | |
| 473 | s->avctx = avctx; |
| 474 | |
| 475 | // FIXME: it may change ? |
| 476 | // if (avctx->bits_per_sample == 24) |
| 477 | // avctx->pix_fmt = AV_PIX_FMT_RGB24; |
| 478 | // else |
| 479 | // avctx->pix_fmt = AV_PIX_FMT_RGB555; |
| 480 | |
| 481 | s->frame = av_frame_alloc(); |
| 482 | if (!s->frame) |
| 483 | return AVERROR(ENOMEM); |
| 484 | |
| 485 | /* there is a vertical predictor for each pixel in a line; each vertical |
| 486 | * predictor is 0 to start with */ |
| 487 | av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int)); |
| 488 | if (!s->vert_pred) |
| 489 | return AVERROR(ENOMEM); |
| 490 | |
| 491 | return 0; |
| 492 | } |
| 493 | |
| 494 | /* |
| 495 | Block decoding order: |
| 496 | |
| 497 | dxi: Y-Y |
| 498 | dxic: Y-C-Y |
| 499 | dxic2: Y-C-Y-C |
| 500 | |
| 501 | hres,vres,i,i%vres (0 < i < 4) |
| 502 | 2x2 0: 0 dxic2 |
| 503 | 2x2 1: 1 dxi |
| 504 | 2x2 2: 0 dxic2 |
| 505 | 2x2 3: 1 dxi |
| 506 | 2x4 0: 0 dxic2 |
| 507 | 2x4 1: 1 dxi |
| 508 | 2x4 2: 2 dxi |
| 509 | 2x4 3: 3 dxi |
| 510 | 4x2 0: 0 dxic |
| 511 | 4x2 1: 1 dxi |
| 512 | 4x2 2: 0 dxic |
| 513 | 4x2 3: 1 dxi |
| 514 | 4x4 0: 0 dxic |
| 515 | 4x4 1: 1 dxi |
| 516 | 4x4 2: 2 dxi |
| 517 | 4x4 3: 3 dxi |
| 518 | */ |
| 519 | |
| 520 | #define GET_NEXT_INDEX() \ |
| 521 | {\ |
| 522 | if (index_stream_index >= s->index_stream_size) { \ |
| 523 | av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \ |
| 524 | return; \ |
| 525 | } \ |
| 526 | index = s->index_stream[index_stream_index++] * 4; \ |
| 527 | } |
| 528 | |
| 529 | #define INC_INDEX \ |
| 530 | do { \ |
| 531 | if (index >= 1023) { \ |
| 532 | av_log(s->avctx, AV_LOG_ERROR, "Invalid index value.\n"); \ |
| 533 | return; \ |
| 534 | } \ |
| 535 | index++; \ |
| 536 | } while (0) |
| 537 | |
| 538 | #define APPLY_C_PREDICTOR() \ |
| 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->c_predictor_table[index]; \ |
| 546 | horiz_pred += ((predictor_pair >> 1) * 5); \ |
| 547 | if (predictor_pair & 1) \ |
| 548 | GET_NEXT_INDEX() \ |
| 549 | else \ |
| 550 | INC_INDEX; \ |
| 551 | } \ |
| 552 | } else \ |
| 553 | INC_INDEX; |
| 554 | |
| 555 | #define APPLY_C_PREDICTOR_24() \ |
| 556 | predictor_pair = s->c_predictor_table[index]; \ |
| 557 | horiz_pred += (predictor_pair >> 1); \ |
| 558 | if (predictor_pair & 1) { \ |
| 559 | GET_NEXT_INDEX() \ |
| 560 | if (!index) { \ |
| 561 | GET_NEXT_INDEX() \ |
| 562 | predictor_pair = s->fat_c_predictor_table[index]; \ |
| 563 | horiz_pred += (predictor_pair >> 1); \ |
| 564 | if (predictor_pair & 1) \ |
| 565 | GET_NEXT_INDEX() \ |
| 566 | else \ |
| 567 | INC_INDEX; \ |
| 568 | } \ |
| 569 | } else \ |
| 570 | INC_INDEX; |
| 571 | |
| 572 | |
| 573 | #define APPLY_Y_PREDICTOR() \ |
| 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->y_predictor_table[index]; \ |
| 581 | horiz_pred += ((predictor_pair >> 1) * 5); \ |
| 582 | if (predictor_pair & 1) \ |
| 583 | GET_NEXT_INDEX() \ |
| 584 | else \ |
| 585 | INC_INDEX; \ |
| 586 | } \ |
| 587 | } else \ |
| 588 | INC_INDEX; |
| 589 | |
| 590 | #define APPLY_Y_PREDICTOR_24() \ |
| 591 | predictor_pair = s->y_predictor_table[index]; \ |
| 592 | horiz_pred += (predictor_pair >> 1); \ |
| 593 | if (predictor_pair & 1) { \ |
| 594 | GET_NEXT_INDEX() \ |
| 595 | if (!index) { \ |
| 596 | GET_NEXT_INDEX() \ |
| 597 | predictor_pair = s->fat_y_predictor_table[index]; \ |
| 598 | horiz_pred += (predictor_pair >> 1); \ |
| 599 | if (predictor_pair & 1) \ |
| 600 | GET_NEXT_INDEX() \ |
| 601 | else \ |
| 602 | INC_INDEX; \ |
| 603 | } \ |
| 604 | } else \ |
| 605 | INC_INDEX; |
| 606 | |
| 607 | #define OUTPUT_PIXEL_PAIR() \ |
| 608 | *current_pixel_pair = *vert_pred + horiz_pred; \ |
| 609 | *vert_pred++ = *current_pixel_pair++; |
| 610 | |
| 611 | static void truemotion1_decode_16bit(TrueMotion1Context *s) |
| 612 | { |
| 613 | int y; |
| 614 | int pixels_left; /* remaining pixels on this line */ |
| 615 | unsigned int predictor_pair; |
| 616 | unsigned int horiz_pred; |
| 617 | unsigned int *vert_pred; |
| 618 | unsigned int *current_pixel_pair; |
| 619 | unsigned char *current_line = s->frame->data[0]; |
| 620 | int keyframe = s->flags & FLAG_KEYFRAME; |
| 621 | |
| 622 | /* these variables are for managing the stream of macroblock change bits */ |
| 623 | const unsigned char *mb_change_bits = s->mb_change_bits; |
| 624 | unsigned char mb_change_byte; |
| 625 | unsigned char mb_change_byte_mask; |
| 626 | int mb_change_index; |
| 627 | |
| 628 | /* these variables are for managing the main index stream */ |
| 629 | int index_stream_index = 0; /* yes, the index into the index stream */ |
| 630 | int index; |
| 631 | |
| 632 | /* clean out the line buffer */ |
| 633 | memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int)); |
| 634 | |
| 635 | GET_NEXT_INDEX(); |
| 636 | |
| 637 | for (y = 0; y < s->avctx->height; y++) { |
| 638 | |
| 639 | /* re-init variables for the next line iteration */ |
| 640 | horiz_pred = 0; |
| 641 | current_pixel_pair = (unsigned int *)current_line; |
| 642 | vert_pred = s->vert_pred; |
| 643 | mb_change_index = 0; |
| 644 | mb_change_byte = mb_change_bits[mb_change_index++]; |
| 645 | mb_change_byte_mask = 0x01; |
| 646 | pixels_left = s->avctx->width; |
| 647 | |
| 648 | while (pixels_left > 0) { |
| 649 | |
| 650 | if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) { |
| 651 | |
| 652 | switch (y & 3) { |
| 653 | case 0: |
| 654 | /* if macroblock width is 2, apply C-Y-C-Y; else |
| 655 | * apply C-Y-Y */ |
| 656 | if (s->block_width == 2) { |
| 657 | APPLY_C_PREDICTOR(); |
| 658 | APPLY_Y_PREDICTOR(); |
| 659 | OUTPUT_PIXEL_PAIR(); |
| 660 | APPLY_C_PREDICTOR(); |
| 661 | APPLY_Y_PREDICTOR(); |
| 662 | OUTPUT_PIXEL_PAIR(); |
| 663 | } else { |
| 664 | APPLY_C_PREDICTOR(); |
| 665 | APPLY_Y_PREDICTOR(); |
| 666 | OUTPUT_PIXEL_PAIR(); |
| 667 | APPLY_Y_PREDICTOR(); |
| 668 | OUTPUT_PIXEL_PAIR(); |
| 669 | } |
| 670 | break; |
| 671 | |
| 672 | case 1: |
| 673 | case 3: |
| 674 | /* always apply 2 Y predictors on these iterations */ |
| 675 | APPLY_Y_PREDICTOR(); |
| 676 | OUTPUT_PIXEL_PAIR(); |
| 677 | APPLY_Y_PREDICTOR(); |
| 678 | OUTPUT_PIXEL_PAIR(); |
| 679 | break; |
| 680 | |
| 681 | case 2: |
| 682 | /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y |
| 683 | * depending on the macroblock type */ |
| 684 | if (s->block_type == BLOCK_2x2) { |
| 685 | APPLY_C_PREDICTOR(); |
| 686 | APPLY_Y_PREDICTOR(); |
| 687 | OUTPUT_PIXEL_PAIR(); |
| 688 | APPLY_C_PREDICTOR(); |
| 689 | APPLY_Y_PREDICTOR(); |
| 690 | OUTPUT_PIXEL_PAIR(); |
| 691 | } else if (s->block_type == BLOCK_4x2) { |
| 692 | APPLY_C_PREDICTOR(); |
| 693 | APPLY_Y_PREDICTOR(); |
| 694 | OUTPUT_PIXEL_PAIR(); |
| 695 | APPLY_Y_PREDICTOR(); |
| 696 | OUTPUT_PIXEL_PAIR(); |
| 697 | } else { |
| 698 | APPLY_Y_PREDICTOR(); |
| 699 | OUTPUT_PIXEL_PAIR(); |
| 700 | APPLY_Y_PREDICTOR(); |
| 701 | OUTPUT_PIXEL_PAIR(); |
| 702 | } |
| 703 | break; |
| 704 | } |
| 705 | |
| 706 | } else { |
| 707 | |
| 708 | /* skip (copy) four pixels, but reassign the horizontal |
| 709 | * predictor */ |
| 710 | *vert_pred++ = *current_pixel_pair++; |
| 711 | horiz_pred = *current_pixel_pair - *vert_pred; |
| 712 | *vert_pred++ = *current_pixel_pair++; |
| 713 | |
| 714 | } |
| 715 | |
| 716 | if (!keyframe) { |
| 717 | mb_change_byte_mask <<= 1; |
| 718 | |
| 719 | /* next byte */ |
| 720 | if (!mb_change_byte_mask) { |
| 721 | mb_change_byte = mb_change_bits[mb_change_index++]; |
| 722 | mb_change_byte_mask = 0x01; |
| 723 | } |
| 724 | } |
| 725 | |
| 726 | pixels_left -= 4; |
| 727 | } |
| 728 | |
| 729 | /* next change row */ |
| 730 | if (((y + 1) & 3) == 0) |
| 731 | mb_change_bits += s->mb_change_bits_row_size; |
| 732 | |
| 733 | current_line += s->frame->linesize[0]; |
| 734 | } |
| 735 | } |
| 736 | |
| 737 | static void truemotion1_decode_24bit(TrueMotion1Context *s) |
| 738 | { |
| 739 | int y; |
| 740 | int pixels_left; /* remaining pixels on this line */ |
| 741 | unsigned int predictor_pair; |
| 742 | unsigned int horiz_pred; |
| 743 | unsigned int *vert_pred; |
| 744 | unsigned int *current_pixel_pair; |
| 745 | unsigned char *current_line = s->frame->data[0]; |
| 746 | int keyframe = s->flags & FLAG_KEYFRAME; |
| 747 | |
| 748 | /* these variables are for managing the stream of macroblock change bits */ |
| 749 | const unsigned char *mb_change_bits = s->mb_change_bits; |
| 750 | unsigned char mb_change_byte; |
| 751 | unsigned char mb_change_byte_mask; |
| 752 | int mb_change_index; |
| 753 | |
| 754 | /* these variables are for managing the main index stream */ |
| 755 | int index_stream_index = 0; /* yes, the index into the index stream */ |
| 756 | int index; |
| 757 | |
| 758 | /* clean out the line buffer */ |
| 759 | memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int)); |
| 760 | |
| 761 | GET_NEXT_INDEX(); |
| 762 | |
| 763 | for (y = 0; y < s->avctx->height; y++) { |
| 764 | |
| 765 | /* re-init variables for the next line iteration */ |
| 766 | horiz_pred = 0; |
| 767 | current_pixel_pair = (unsigned int *)current_line; |
| 768 | vert_pred = s->vert_pred; |
| 769 | mb_change_index = 0; |
| 770 | mb_change_byte = mb_change_bits[mb_change_index++]; |
| 771 | mb_change_byte_mask = 0x01; |
| 772 | pixels_left = s->avctx->width; |
| 773 | |
| 774 | while (pixels_left > 0) { |
| 775 | |
| 776 | if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) { |
| 777 | |
| 778 | switch (y & 3) { |
| 779 | case 0: |
| 780 | /* if macroblock width is 2, apply C-Y-C-Y; else |
| 781 | * apply C-Y-Y */ |
| 782 | if (s->block_width == 2) { |
| 783 | APPLY_C_PREDICTOR_24(); |
| 784 | APPLY_Y_PREDICTOR_24(); |
| 785 | OUTPUT_PIXEL_PAIR(); |
| 786 | APPLY_C_PREDICTOR_24(); |
| 787 | APPLY_Y_PREDICTOR_24(); |
| 788 | OUTPUT_PIXEL_PAIR(); |
| 789 | } else { |
| 790 | APPLY_C_PREDICTOR_24(); |
| 791 | APPLY_Y_PREDICTOR_24(); |
| 792 | OUTPUT_PIXEL_PAIR(); |
| 793 | APPLY_Y_PREDICTOR_24(); |
| 794 | OUTPUT_PIXEL_PAIR(); |
| 795 | } |
| 796 | break; |
| 797 | |
| 798 | case 1: |
| 799 | case 3: |
| 800 | /* always apply 2 Y predictors on these iterations */ |
| 801 | APPLY_Y_PREDICTOR_24(); |
| 802 | OUTPUT_PIXEL_PAIR(); |
| 803 | APPLY_Y_PREDICTOR_24(); |
| 804 | OUTPUT_PIXEL_PAIR(); |
| 805 | break; |
| 806 | |
| 807 | case 2: |
| 808 | /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y |
| 809 | * depending on the macroblock type */ |
| 810 | if (s->block_type == BLOCK_2x2) { |
| 811 | APPLY_C_PREDICTOR_24(); |
| 812 | APPLY_Y_PREDICTOR_24(); |
| 813 | OUTPUT_PIXEL_PAIR(); |
| 814 | APPLY_C_PREDICTOR_24(); |
| 815 | APPLY_Y_PREDICTOR_24(); |
| 816 | OUTPUT_PIXEL_PAIR(); |
| 817 | } else if (s->block_type == BLOCK_4x2) { |
| 818 | APPLY_C_PREDICTOR_24(); |
| 819 | APPLY_Y_PREDICTOR_24(); |
| 820 | OUTPUT_PIXEL_PAIR(); |
| 821 | APPLY_Y_PREDICTOR_24(); |
| 822 | OUTPUT_PIXEL_PAIR(); |
| 823 | } else { |
| 824 | APPLY_Y_PREDICTOR_24(); |
| 825 | OUTPUT_PIXEL_PAIR(); |
| 826 | APPLY_Y_PREDICTOR_24(); |
| 827 | OUTPUT_PIXEL_PAIR(); |
| 828 | } |
| 829 | break; |
| 830 | } |
| 831 | |
| 832 | } else { |
| 833 | |
| 834 | /* skip (copy) four pixels, but reassign the horizontal |
| 835 | * predictor */ |
| 836 | *vert_pred++ = *current_pixel_pair++; |
| 837 | horiz_pred = *current_pixel_pair - *vert_pred; |
| 838 | *vert_pred++ = *current_pixel_pair++; |
| 839 | |
| 840 | } |
| 841 | |
| 842 | if (!keyframe) { |
| 843 | mb_change_byte_mask <<= 1; |
| 844 | |
| 845 | /* next byte */ |
| 846 | if (!mb_change_byte_mask) { |
| 847 | mb_change_byte = mb_change_bits[mb_change_index++]; |
| 848 | mb_change_byte_mask = 0x01; |
| 849 | } |
| 850 | } |
| 851 | |
| 852 | pixels_left -= 2; |
| 853 | } |
| 854 | |
| 855 | /* next change row */ |
| 856 | if (((y + 1) & 3) == 0) |
| 857 | mb_change_bits += s->mb_change_bits_row_size; |
| 858 | |
| 859 | current_line += s->frame->linesize[0]; |
| 860 | } |
| 861 | } |
| 862 | |
| 863 | |
| 864 | static int truemotion1_decode_frame(AVCodecContext *avctx, |
| 865 | void *data, int *got_frame, |
| 866 | AVPacket *avpkt) |
| 867 | { |
| 868 | const uint8_t *buf = avpkt->data; |
| 869 | int ret, buf_size = avpkt->size; |
| 870 | TrueMotion1Context *s = avctx->priv_data; |
| 871 | |
| 872 | s->buf = buf; |
| 873 | s->size = buf_size; |
| 874 | |
| 875 | if ((ret = truemotion1_decode_header(s)) < 0) |
| 876 | return ret; |
| 877 | |
| 878 | if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) |
| 879 | return ret; |
| 880 | |
| 881 | if (compression_types[s->compression].algorithm == ALGO_RGB24H) { |
| 882 | truemotion1_decode_24bit(s); |
| 883 | } else if (compression_types[s->compression].algorithm != ALGO_NOP) { |
| 884 | truemotion1_decode_16bit(s); |
| 885 | } |
| 886 | |
| 887 | if ((ret = av_frame_ref(data, s->frame)) < 0) |
| 888 | return ret; |
| 889 | |
| 890 | *got_frame = 1; |
| 891 | |
| 892 | /* report that the buffer was completely consumed */ |
| 893 | return buf_size; |
| 894 | } |
| 895 | |
| 896 | static av_cold int truemotion1_decode_end(AVCodecContext *avctx) |
| 897 | { |
| 898 | TrueMotion1Context *s = avctx->priv_data; |
| 899 | |
| 900 | av_frame_free(&s->frame); |
| 901 | av_freep(&s->vert_pred); |
| 902 | |
| 903 | return 0; |
| 904 | } |
| 905 | |
| 906 | AVCodec ff_truemotion1_decoder = { |
| 907 | .name = "truemotion1", |
| 908 | .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"), |
| 909 | .type = AVMEDIA_TYPE_VIDEO, |
| 910 | .id = AV_CODEC_ID_TRUEMOTION1, |
| 911 | .priv_data_size = sizeof(TrueMotion1Context), |
| 912 | .init = truemotion1_decode_init, |
| 913 | .close = truemotion1_decode_end, |
| 914 | .decode = truemotion1_decode_frame, |
| 915 | .capabilities = CODEC_CAP_DR1, |
| 916 | }; |