1/* 2 * FLI/FLC Animation Video Decoder 3 * Copyright (C) 2003, 2004 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 24 * Autodesk Animator FLI/FLC Video Decoder 25 * by Mike Melanson (melanson@pcisys.net) 26 * for more information on the .fli/.flc file format and all of its many 27 * variations, visit: 28 * http://www.compuphase.com/flic.htm 29 * 30 * This decoder outputs PAL8/RGB555/RGB565 and maybe one day RGB24 31 * colorspace data, depending on the FLC. To use this decoder, be 32 * sure that your demuxer sends the FLI file header to the decoder via 33 * the extradata chunk in AVCodecContext. The chunk should be 128 bytes 34 * large. The only exception is for FLI files from the game "Magic Carpet", 35 * in which the header is only 12 bytes. 36 */ 37 38#include <stdio.h> 39#include <stdlib.h> 40#include <string.h> 41 42#include "libavutil/intreadwrite.h" 43#include "avcodec.h" 44#include "bytestream.h" 45#include "internal.h" 46#include "mathops.h" 47 48#define FLI_256_COLOR 4 49#define FLI_DELTA 7 50#define FLI_COLOR 11 51#define FLI_LC 12 52#define FLI_BLACK 13 53#define FLI_BRUN 15 54#define FLI_COPY 16 55#define FLI_MINI 18 56#define FLI_DTA_BRUN 25 57#define FLI_DTA_COPY 26 58#define FLI_DTA_LC 27 59 60#define FLI_TYPE_CODE (0xAF11) 61#define FLC_FLX_TYPE_CODE (0xAF12) 62#define FLC_DTA_TYPE_CODE (0xAF44) /* Marks an "Extended FLC" comes from Dave's Targa Animator (DTA) */ 63#define FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE (0xAF13) 64 65#define CHECK_PIXEL_PTR(n) \ 66 if (pixel_ptr + n > pixel_limit) { \ 67 av_log (s->avctx, AV_LOG_ERROR, "Invalid pixel_ptr = %d > pixel_limit = %d\n", \ 68 pixel_ptr + n, pixel_limit); \ 69 return AVERROR_INVALIDDATA; \ 70 } \ 71 72typedef struct FlicDecodeContext { 73 AVCodecContext *avctx; 74 AVFrame *frame; 75 76 unsigned int palette[256]; 77 int new_palette; 78 int fli_type; /* either 0xAF11 or 0xAF12, affects palette resolution */ 79} FlicDecodeContext; 80 81static av_cold int flic_decode_init(AVCodecContext *avctx) 82{ 83 FlicDecodeContext *s = avctx->priv_data; 84 unsigned char *fli_header = (unsigned char *)avctx->extradata; 85 int depth; 86 87 if (avctx->extradata_size != 0 && 88 avctx->extradata_size != 12 && 89 avctx->extradata_size != 128 && 90 avctx->extradata_size != 256 && 91 avctx->extradata_size != 904 && 92 avctx->extradata_size != 1024) { 93 av_log(avctx, AV_LOG_ERROR, "Unexpected extradata size %d\n", avctx->extradata_size); 94 return AVERROR_INVALIDDATA; 95 } 96 97 s->avctx = avctx; 98 99 if (s->avctx->extradata_size == 12) { 100 /* special case for magic carpet FLIs */ 101 s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE; 102 depth = 8; 103 } else if (avctx->extradata_size == 1024) { 104 uint8_t *ptr = avctx->extradata; 105 int i; 106 107 for (i = 0; i < 256; i++) { 108 s->palette[i] = AV_RL32(ptr); 109 ptr += 4; 110 } 111 depth = 8; 112 /* FLI in MOV, see e.g. FFmpeg trac issue #626 */ 113 } else if (avctx->extradata_size == 0 || 114 avctx->extradata_size == 256 || 115 /* see FFmpeg ticket #1234 */ 116 avctx->extradata_size == 904) { 117 s->fli_type = FLI_TYPE_CODE; 118 depth = 8; 119 } else { 120 s->fli_type = AV_RL16(&fli_header[4]); 121 depth = AV_RL16(&fli_header[12]); 122 } 123 124 if (depth == 0) { 125 depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */ 126 } 127 128 if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) { 129 depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */ 130 } 131 132 switch (depth) { 133 case 8 : avctx->pix_fmt = AV_PIX_FMT_PAL8; break; 134 case 15 : avctx->pix_fmt = AV_PIX_FMT_RGB555; break; 135 case 16 : avctx->pix_fmt = AV_PIX_FMT_RGB565; break; 136 case 24 : avctx->pix_fmt = AV_PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */ 137 avpriv_request_sample(avctx, "24Bpp FLC/FLX"); 138 return AVERROR_PATCHWELCOME; 139 default : 140 av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth); 141 return AVERROR_INVALIDDATA; 142 } 143 144 s->frame = av_frame_alloc(); 145 if (!s->frame) 146 return AVERROR(ENOMEM); 147 148 s->new_palette = 0; 149 150 return 0; 151} 152 153static int flic_decode_frame_8BPP(AVCodecContext *avctx, 154 void *data, int *got_frame, 155 const uint8_t *buf, int buf_size) 156{ 157 FlicDecodeContext *s = avctx->priv_data; 158 159 GetByteContext g2; 160 int pixel_ptr; 161 int palette_ptr; 162 unsigned char palette_idx1; 163 unsigned char palette_idx2; 164 165 unsigned int frame_size; 166 int num_chunks; 167 168 unsigned int chunk_size; 169 int chunk_type; 170 171 int i, j, ret; 172 173 int color_packets; 174 int color_changes; 175 int color_shift; 176 unsigned char r, g, b; 177 178 int lines; 179 int compressed_lines; 180 int starting_line; 181 signed short line_packets; 182 int y_ptr; 183 int byte_run; 184 int pixel_skip; 185 int pixel_countdown; 186 unsigned char *pixels; 187 unsigned int pixel_limit; 188 189 bytestream2_init(&g2, buf, buf_size); 190 191 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) 192 return ret; 193 194 pixels = s->frame->data[0]; 195 pixel_limit = s->avctx->height * s->frame->linesize[0]; 196 if (buf_size < 16 || buf_size > INT_MAX - (3 * 256 + FF_INPUT_BUFFER_PADDING_SIZE)) 197 return AVERROR_INVALIDDATA; 198 frame_size = bytestream2_get_le32(&g2); 199 if (frame_size > buf_size) 200 frame_size = buf_size; 201 bytestream2_skip(&g2, 2); /* skip the magic number */ 202 num_chunks = bytestream2_get_le16(&g2); 203 bytestream2_skip(&g2, 8); /* skip padding */ 204 205 frame_size -= 16; 206 207 /* iterate through the chunks */ 208 while ((frame_size >= 6) && (num_chunks > 0) && 209 bytestream2_get_bytes_left(&g2) >= 4) { 210 int stream_ptr_after_chunk; 211 chunk_size = bytestream2_get_le32(&g2); 212 if (chunk_size > frame_size) { 213 av_log(avctx, AV_LOG_WARNING, 214 "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size); 215 chunk_size = frame_size; 216 } 217 stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size; 218 219 chunk_type = bytestream2_get_le16(&g2); 220 221 switch (chunk_type) { 222 case FLI_256_COLOR: 223 case FLI_COLOR: 224 /* check special case: If this file is from the Magic Carpet 225 * game and uses 6-bit colors even though it reports 256-color 226 * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during 227 * initialization) */ 228 if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE)) 229 color_shift = 0; 230 else 231 color_shift = 2; 232 /* set up the palette */ 233 color_packets = bytestream2_get_le16(&g2); 234 palette_ptr = 0; 235 for (i = 0; i < color_packets; i++) { 236 /* first byte is how many colors to skip */ 237 palette_ptr += bytestream2_get_byte(&g2); 238 239 /* next byte indicates how many entries to change */ 240 color_changes = bytestream2_get_byte(&g2); 241 242 /* if there are 0 color changes, there are actually 256 */ 243 if (color_changes == 0) 244 color_changes = 256; 245 246 if (bytestream2_tell(&g2) + color_changes * 3 > stream_ptr_after_chunk) 247 break; 248 249 for (j = 0; j < color_changes; j++) { 250 unsigned int entry; 251 252 /* wrap around, for good measure */ 253 if ((unsigned)palette_ptr >= 256) 254 palette_ptr = 0; 255 256 r = bytestream2_get_byte(&g2) << color_shift; 257 g = bytestream2_get_byte(&g2) << color_shift; 258 b = bytestream2_get_byte(&g2) << color_shift; 259 entry = 0xFFU << 24 | r << 16 | g << 8 | b; 260 if (color_shift == 2) 261 entry |= entry >> 6 & 0x30303; 262 if (s->palette[palette_ptr] != entry) 263 s->new_palette = 1; 264 s->palette[palette_ptr++] = entry; 265 } 266 } 267 break; 268 269 case FLI_DELTA: 270 y_ptr = 0; 271 compressed_lines = bytestream2_get_le16(&g2); 272 while (compressed_lines > 0) { 273 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk) 274 break; 275 line_packets = bytestream2_get_le16(&g2); 276 if ((line_packets & 0xC000) == 0xC000) { 277 // line skip opcode 278 line_packets = -line_packets; 279 y_ptr += line_packets * s->frame->linesize[0]; 280 } else if ((line_packets & 0xC000) == 0x4000) { 281 av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets); 282 } else if ((line_packets & 0xC000) == 0x8000) { 283 // "last byte" opcode 284 pixel_ptr= y_ptr + s->frame->linesize[0] - 1; 285 CHECK_PIXEL_PTR(0); 286 pixels[pixel_ptr] = line_packets & 0xff; 287 } else { 288 compressed_lines--; 289 pixel_ptr = y_ptr; 290 CHECK_PIXEL_PTR(0); 291 pixel_countdown = s->avctx->width; 292 for (i = 0; i < line_packets; i++) { 293 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk) 294 break; 295 /* account for the skip bytes */ 296 pixel_skip = bytestream2_get_byte(&g2); 297 pixel_ptr += pixel_skip; 298 pixel_countdown -= pixel_skip; 299 byte_run = sign_extend(bytestream2_get_byte(&g2), 8); 300 if (byte_run < 0) { 301 byte_run = -byte_run; 302 palette_idx1 = bytestream2_get_byte(&g2); 303 palette_idx2 = bytestream2_get_byte(&g2); 304 CHECK_PIXEL_PTR(byte_run * 2); 305 for (j = 0; j < byte_run; j++, pixel_countdown -= 2) { 306 pixels[pixel_ptr++] = palette_idx1; 307 pixels[pixel_ptr++] = palette_idx2; 308 } 309 } else { 310 CHECK_PIXEL_PTR(byte_run * 2); 311 if (bytestream2_tell(&g2) + byte_run * 2 > stream_ptr_after_chunk) 312 break; 313 for (j = 0; j < byte_run * 2; j++, pixel_countdown--) { 314 pixels[pixel_ptr++] = bytestream2_get_byte(&g2); 315 } 316 } 317 } 318 319 y_ptr += s->frame->linesize[0]; 320 } 321 } 322 break; 323 324 case FLI_LC: 325 /* line compressed */ 326 starting_line = bytestream2_get_le16(&g2); 327 y_ptr = 0; 328 y_ptr += starting_line * s->frame->linesize[0]; 329 330 compressed_lines = bytestream2_get_le16(&g2); 331 while (compressed_lines > 0) { 332 pixel_ptr = y_ptr; 333 CHECK_PIXEL_PTR(0); 334 pixel_countdown = s->avctx->width; 335 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk) 336 break; 337 line_packets = bytestream2_get_byte(&g2); 338 if (line_packets > 0) { 339 for (i = 0; i < line_packets; i++) { 340 /* account for the skip bytes */ 341 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk) 342 break; 343 pixel_skip = bytestream2_get_byte(&g2); 344 pixel_ptr += pixel_skip; 345 pixel_countdown -= pixel_skip; 346 byte_run = sign_extend(bytestream2_get_byte(&g2),8); 347 if (byte_run > 0) { 348 CHECK_PIXEL_PTR(byte_run); 349 if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk) 350 break; 351 for (j = 0; j < byte_run; j++, pixel_countdown--) { 352 pixels[pixel_ptr++] = bytestream2_get_byte(&g2); 353 } 354 } else if (byte_run < 0) { 355 byte_run = -byte_run; 356 palette_idx1 = bytestream2_get_byte(&g2); 357 CHECK_PIXEL_PTR(byte_run); 358 for (j = 0; j < byte_run; j++, pixel_countdown--) { 359 pixels[pixel_ptr++] = palette_idx1; 360 } 361 } 362 } 363 } 364 365 y_ptr += s->frame->linesize[0]; 366 compressed_lines--; 367 } 368 break; 369 370 case FLI_BLACK: 371 /* set the whole frame to color 0 (which is usually black) */ 372 memset(pixels, 0, 373 s->frame->linesize[0] * s->avctx->height); 374 break; 375 376 case FLI_BRUN: 377 /* Byte run compression: This chunk type only occurs in the first 378 * FLI frame and it will update the entire frame. */ 379 y_ptr = 0; 380 for (lines = 0; lines < s->avctx->height; lines++) { 381 pixel_ptr = y_ptr; 382 /* disregard the line packets; instead, iterate through all 383 * pixels on a row */ 384 bytestream2_skip(&g2, 1); 385 pixel_countdown = s->avctx->width; 386 while (pixel_countdown > 0) { 387 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk) 388 break; 389 byte_run = sign_extend(bytestream2_get_byte(&g2), 8); 390 if (!byte_run) { 391 av_log(avctx, AV_LOG_ERROR, "Invalid byte run value.\n"); 392 return AVERROR_INVALIDDATA; 393 } 394 395 if (byte_run > 0) { 396 palette_idx1 = bytestream2_get_byte(&g2); 397 CHECK_PIXEL_PTR(byte_run); 398 for (j = 0; j < byte_run; j++) { 399 pixels[pixel_ptr++] = palette_idx1; 400 pixel_countdown--; 401 if (pixel_countdown < 0) 402 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n", 403 pixel_countdown, lines); 404 } 405 } else { /* copy bytes if byte_run < 0 */ 406 byte_run = -byte_run; 407 CHECK_PIXEL_PTR(byte_run); 408 if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk) 409 break; 410 for (j = 0; j < byte_run; j++) { 411 pixels[pixel_ptr++] = bytestream2_get_byte(&g2); 412 pixel_countdown--; 413 if (pixel_countdown < 0) 414 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n", 415 pixel_countdown, lines); 416 } 417 } 418 } 419 420 y_ptr += s->frame->linesize[0]; 421 } 422 break; 423 424 case FLI_COPY: 425 /* copy the chunk (uncompressed frame) */ 426 if (chunk_size - 6 != s->avctx->width * s->avctx->height) { 427 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \ 428 "has incorrect size, skipping chunk\n", chunk_size - 6); 429 bytestream2_skip(&g2, chunk_size - 6); 430 } else { 431 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height; 432 y_ptr += s->frame->linesize[0]) { 433 bytestream2_get_buffer(&g2, &pixels[y_ptr], 434 s->avctx->width); 435 } 436 } 437 break; 438 439 case FLI_MINI: 440 /* some sort of a thumbnail? disregard this chunk... */ 441 break; 442 443 default: 444 av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type); 445 break; 446 } 447 448 if (stream_ptr_after_chunk - bytestream2_tell(&g2) > 0) 449 bytestream2_skip(&g2, stream_ptr_after_chunk - bytestream2_tell(&g2)); 450 451 frame_size -= chunk_size; 452 num_chunks--; 453 } 454 455 /* by the end of the chunk, the stream ptr should equal the frame 456 * size (minus 1 or 2, possibly); if it doesn't, issue a warning */ 457 if (bytestream2_get_bytes_left(&g2) > 2) 458 av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \ 459 "and final chunk ptr = %d\n", buf_size, 460 buf_size - bytestream2_get_bytes_left(&g2)); 461 462 /* make the palette available on the way out */ 463 memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE); 464 if (s->new_palette) { 465 s->frame->palette_has_changed = 1; 466 s->new_palette = 0; 467 } 468 469 if ((ret = av_frame_ref(data, s->frame)) < 0) 470 return ret; 471 472 *got_frame = 1; 473 474 return buf_size; 475} 476 477static int flic_decode_frame_15_16BPP(AVCodecContext *avctx, 478 void *data, int *got_frame, 479 const uint8_t *buf, int buf_size) 480{ 481 /* Note, the only difference between the 15Bpp and 16Bpp */ 482 /* Format is the pixel format, the packets are processed the same. */ 483 FlicDecodeContext *s = avctx->priv_data; 484 485 GetByteContext g2; 486 int pixel_ptr; 487 unsigned char palette_idx1; 488 489 unsigned int frame_size; 490 int num_chunks; 491 492 unsigned int chunk_size; 493 int chunk_type; 494 495 int i, j, ret; 496 497 int lines; 498 int compressed_lines; 499 signed short line_packets; 500 int y_ptr; 501 int byte_run; 502 int pixel_skip; 503 int pixel_countdown; 504 unsigned char *pixels; 505 int pixel; 506 unsigned int pixel_limit; 507 508 bytestream2_init(&g2, buf, buf_size); 509 510 if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) 511 return ret; 512 513 pixels = s->frame->data[0]; 514 pixel_limit = s->avctx->height * s->frame->linesize[0]; 515 516 frame_size = bytestream2_get_le32(&g2); 517 bytestream2_skip(&g2, 2); /* skip the magic number */ 518 num_chunks = bytestream2_get_le16(&g2); 519 bytestream2_skip(&g2, 8); /* skip padding */ 520 if (frame_size > buf_size) 521 frame_size = buf_size; 522 523 frame_size -= 16; 524 525 /* iterate through the chunks */ 526 while ((frame_size > 0) && (num_chunks > 0) && 527 bytestream2_get_bytes_left(&g2) >= 4) { 528 int stream_ptr_after_chunk; 529 chunk_size = bytestream2_get_le32(&g2); 530 if (chunk_size > frame_size) { 531 av_log(avctx, AV_LOG_WARNING, 532 "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size); 533 chunk_size = frame_size; 534 } 535 stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size; 536 537 chunk_type = bytestream2_get_le16(&g2); 538 539 540 switch (chunk_type) { 541 case FLI_256_COLOR: 542 case FLI_COLOR: 543 /* For some reason, it seems that non-palettized flics do 544 * include one of these chunks in their first frame. 545 * Why I do not know, it seems rather extraneous. */ 546 av_dlog(avctx, 547 "Unexpected Palette chunk %d in non-palettized FLC\n", 548 chunk_type); 549 bytestream2_skip(&g2, chunk_size - 6); 550 break; 551 552 case FLI_DELTA: 553 case FLI_DTA_LC: 554 y_ptr = 0; 555 compressed_lines = bytestream2_get_le16(&g2); 556 while (compressed_lines > 0) { 557 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk) 558 break; 559 line_packets = bytestream2_get_le16(&g2); 560 if (line_packets < 0) { 561 line_packets = -line_packets; 562 y_ptr += line_packets * s->frame->linesize[0]; 563 } else { 564 compressed_lines--; 565 pixel_ptr = y_ptr; 566 CHECK_PIXEL_PTR(0); 567 pixel_countdown = s->avctx->width; 568 for (i = 0; i < line_packets; i++) { 569 /* account for the skip bytes */ 570 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk) 571 break; 572 pixel_skip = bytestream2_get_byte(&g2); 573 pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */ 574 pixel_countdown -= pixel_skip; 575 byte_run = sign_extend(bytestream2_get_byte(&g2), 8); 576 if (byte_run < 0) { 577 byte_run = -byte_run; 578 pixel = bytestream2_get_le16(&g2); 579 CHECK_PIXEL_PTR(2 * byte_run); 580 for (j = 0; j < byte_run; j++, pixel_countdown -= 2) { 581 *((signed short*)(&pixels[pixel_ptr])) = pixel; 582 pixel_ptr += 2; 583 } 584 } else { 585 if (bytestream2_tell(&g2) + 2*byte_run > stream_ptr_after_chunk) 586 break; 587 CHECK_PIXEL_PTR(2 * byte_run); 588 for (j = 0; j < byte_run; j++, pixel_countdown--) { 589 *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2); 590 pixel_ptr += 2; 591 } 592 } 593 } 594 595 y_ptr += s->frame->linesize[0]; 596 } 597 } 598 break; 599 600 case FLI_LC: 601 av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-palettized FLC\n"); 602 bytestream2_skip(&g2, chunk_size - 6); 603 break; 604 605 case FLI_BLACK: 606 /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */ 607 memset(pixels, 0x0000, 608 s->frame->linesize[0] * s->avctx->height); 609 break; 610 611 case FLI_BRUN: 612 y_ptr = 0; 613 for (lines = 0; lines < s->avctx->height; lines++) { 614 pixel_ptr = y_ptr; 615 /* disregard the line packets; instead, iterate through all 616 * pixels on a row */ 617 bytestream2_skip(&g2, 1); 618 pixel_countdown = (s->avctx->width * 2); 619 620 while (pixel_countdown > 0) { 621 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk) 622 break; 623 byte_run = sign_extend(bytestream2_get_byte(&g2), 8); 624 if (byte_run > 0) { 625 palette_idx1 = bytestream2_get_byte(&g2); 626 CHECK_PIXEL_PTR(byte_run); 627 for (j = 0; j < byte_run; j++) { 628 pixels[pixel_ptr++] = palette_idx1; 629 pixel_countdown--; 630 if (pixel_countdown < 0) 631 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n", 632 pixel_countdown, lines); 633 } 634 } else { /* copy bytes if byte_run < 0 */ 635 byte_run = -byte_run; 636 if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk) 637 break; 638 CHECK_PIXEL_PTR(byte_run); 639 for (j = 0; j < byte_run; j++) { 640 palette_idx1 = bytestream2_get_byte(&g2); 641 pixels[pixel_ptr++] = palette_idx1; 642 pixel_countdown--; 643 if (pixel_countdown < 0) 644 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n", 645 pixel_countdown, lines); 646 } 647 } 648 } 649 650 /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed. 651 * This does not give us any good opportunity to perform word endian conversion 652 * during decompression. So if it is required (i.e., this is not a LE target, we do 653 * a second pass over the line here, swapping the bytes. 654 */ 655#if HAVE_BIGENDIAN 656 pixel_ptr = y_ptr; 657 pixel_countdown = s->avctx->width; 658 while (pixel_countdown > 0) { 659 *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]); 660 pixel_ptr += 2; 661 } 662#endif 663 y_ptr += s->frame->linesize[0]; 664 } 665 break; 666 667 case FLI_DTA_BRUN: 668 y_ptr = 0; 669 for (lines = 0; lines < s->avctx->height; lines++) { 670 pixel_ptr = y_ptr; 671 /* disregard the line packets; instead, iterate through all 672 * pixels on a row */ 673 bytestream2_skip(&g2, 1); 674 pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */ 675 676 while (pixel_countdown > 0) { 677 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk) 678 break; 679 byte_run = sign_extend(bytestream2_get_byte(&g2), 8); 680 if (byte_run > 0) { 681 pixel = bytestream2_get_le16(&g2); 682 CHECK_PIXEL_PTR(2 * byte_run); 683 for (j = 0; j < byte_run; j++) { 684 *((signed short*)(&pixels[pixel_ptr])) = pixel; 685 pixel_ptr += 2; 686 pixel_countdown--; 687 if (pixel_countdown < 0) 688 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n", 689 pixel_countdown); 690 } 691 } else { /* copy pixels if byte_run < 0 */ 692 byte_run = -byte_run; 693 if (bytestream2_tell(&g2) + 2 * byte_run > stream_ptr_after_chunk) 694 break; 695 CHECK_PIXEL_PTR(2 * byte_run); 696 for (j = 0; j < byte_run; j++) { 697 *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2); 698 pixel_ptr += 2; 699 pixel_countdown--; 700 if (pixel_countdown < 0) 701 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n", 702 pixel_countdown); 703 } 704 } 705 } 706 707 y_ptr += s->frame->linesize[0]; 708 } 709 break; 710 711 case FLI_COPY: 712 case FLI_DTA_COPY: 713 /* copy the chunk (uncompressed frame) */ 714 if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) { 715 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \ 716 "bigger than image, skipping chunk\n", chunk_size - 6); 717 bytestream2_skip(&g2, chunk_size - 6); 718 } else { 719 720 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height; 721 y_ptr += s->frame->linesize[0]) { 722 723 pixel_countdown = s->avctx->width; 724 pixel_ptr = 0; 725 while (pixel_countdown > 0) { 726 *((signed short*)(&pixels[y_ptr + pixel_ptr])) = bytestream2_get_le16(&g2); 727 pixel_ptr += 2; 728 pixel_countdown--; 729 } 730 } 731 } 732 break; 733 734 case FLI_MINI: 735 /* some sort of a thumbnail? disregard this chunk... */ 736 bytestream2_skip(&g2, chunk_size - 6); 737 break; 738 739 default: 740 av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type); 741 break; 742 } 743 744 frame_size -= chunk_size; 745 num_chunks--; 746 } 747 748 /* by the end of the chunk, the stream ptr should equal the frame 749 * size (minus 1, possibly); if it doesn't, issue a warning */ 750 if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1)) 751 av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \ 752 "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2)); 753 754 if ((ret = av_frame_ref(data, s->frame)) < 0) 755 return ret; 756 757 *got_frame = 1; 758 759 return buf_size; 760} 761 762static int flic_decode_frame_24BPP(AVCodecContext *avctx, 763 void *data, int *got_frame, 764 const uint8_t *buf, int buf_size) 765{ 766 av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n"); 767 return AVERROR_PATCHWELCOME; 768} 769 770static int flic_decode_frame(AVCodecContext *avctx, 771 void *data, int *got_frame, 772 AVPacket *avpkt) 773{ 774 const uint8_t *buf = avpkt->data; 775 int buf_size = avpkt->size; 776 if (avctx->pix_fmt == AV_PIX_FMT_PAL8) { 777 return flic_decode_frame_8BPP(avctx, data, got_frame, 778 buf, buf_size); 779 } 780 else if ((avctx->pix_fmt == AV_PIX_FMT_RGB555) || 781 (avctx->pix_fmt == AV_PIX_FMT_RGB565)) { 782 return flic_decode_frame_15_16BPP(avctx, data, got_frame, 783 buf, buf_size); 784 } 785 else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) { 786 return flic_decode_frame_24BPP(avctx, data, got_frame, 787 buf, buf_size); 788 } 789 790 /* Should not get here, ever as the pix_fmt is processed */ 791 /* in flic_decode_init and the above if should deal with */ 792 /* the finite set of possibilites allowable by here. */ 793 /* But in case we do, just error out. */ 794 av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n"); 795 return AVERROR_BUG; 796} 797 798 799static av_cold int flic_decode_end(AVCodecContext *avctx) 800{ 801 FlicDecodeContext *s = avctx->priv_data; 802 803 av_frame_free(&s->frame); 804 805 return 0; 806} 807 808AVCodec ff_flic_decoder = { 809 .name = "flic", 810 .long_name = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"), 811 .type = AVMEDIA_TYPE_VIDEO, 812 .id = AV_CODEC_ID_FLIC, 813 .priv_data_size = sizeof(FlicDecodeContext), 814 .init = flic_decode_init, 815 .close = flic_decode_end, 816 .decode = flic_decode_frame, 817 .capabilities = CODEC_CAP_DR1, 818}; 819