libavcodec/flicvideo.c

   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 flic.c
  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 #include <unistd.h>
  42
  43 #include "avcodec.h"
  44 #include "bswap.h"
  45
  46 #define FLI_256_COLOR 4
  47 #define FLI_DELTA     7
  48 #define FLI_COLOR     11
  49 #define FLI_LC        12
  50 #define FLI_BLACK     13
  51 #define FLI_BRUN      15
  52 #define FLI_COPY      16
  53 #define FLI_MINI      18
  54 #define FLI_DTA_BRUN  25
  55 #define FLI_DTA_COPY  26
  56 #define FLI_DTA_LC    27
  57
  58 #define FLI_TYPE_CODE     (0xAF11)
  59 #define FLC_FLX_TYPE_CODE (0xAF12)
  60 #define FLC_DTA_TYPE_CODE (0xAF44) /* Marks an "Extended FLC" comes from Dave's Targa Animator (DTA) */
  61 #define FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE (0xAF13)
  62
  63 #define CHECK_PIXEL_PTR(n) \
  64     if (pixel_ptr + n > pixel_limit) { \
  65         av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr >= pixel_limit (%d >= %d)\n", \
  66         pixel_ptr + n, pixel_limit); \
  67         return -1; \
  68     } \
  69
  70 typedef struct FlicDecodeContext {
  71     AVCodecContext *avctx;
  72     AVFrame frame;
  73
  74     unsigned int palette[256];
  75     int new_palette;
  76     int fli_type;  /* either 0xAF11 or 0xAF12, affects palette resolution */
  77 } FlicDecodeContext;
  78
  79 static av_cold int flic_decode_init(AVCodecContext *avctx)
  80 {
  81     FlicDecodeContext *s = avctx->priv_data;
  82     unsigned char *fli_header = (unsigned char *)avctx->extradata;
  83     int depth;
  84
  85     s->avctx = avctx;
  86
  87     s->fli_type = AV_RL16(&fli_header[4]); /* Might be overridden if a Magic Carpet FLC */
  88
  89     depth = 0;
  90     if (s->avctx->extradata_size == 12) {
  91         /* special case for magic carpet FLIs */
  92         s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE;
  93         depth = 8;
  94     } else if (s->avctx->extradata_size != 128) {
  95         av_log(avctx, AV_LOG_ERROR, "Expected extradata of 12 or 128 bytes\n");
  96         return -1;
  97     } else {
  98         depth = AV_RL16(&fli_header[12]);
  99     }
 100
 101     if (depth == 0) {
 102         depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
 103     }
 104
 105     if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
 106         depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
 107     }
 108
 109     switch (depth) {
 110         case 8  : avctx->pix_fmt = PIX_FMT_PAL8; break;
 111         case 15 : avctx->pix_fmt = PIX_FMT_RGB555; break;
 112         case 16 : avctx->pix_fmt = PIX_FMT_RGB565; break;
 113         case 24 : avctx->pix_fmt = PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */
 114                   av_log(avctx, AV_LOG_ERROR, "24Bpp FLC/FLX is unsupported due to no test files.\n");
 115                   return -1;
 116                   break;
 117         default :
 118                   av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
 119                   return -1;
 120     }
 121
 122     s->frame.data[0] = NULL;
 123     s->new_palette = 0;
 124
 125     return 0;
 126 }
 127
 128 static int flic_decode_frame_8BPP(AVCodecContext *avctx,
 129                                   void *data, int *data_size,
 130                                   const uint8_t *buf, int buf_size)
 131 {
 132     FlicDecodeContext *s = avctx->priv_data;
 133
 134     int stream_ptr = 0;
 135     int stream_ptr_after_color_chunk;
 136     int pixel_ptr;
 137     int palette_ptr;
 138     unsigned char palette_idx1;
 139     unsigned char palette_idx2;
 140
 141     unsigned int frame_size;
 142     int num_chunks;
 143
 144     unsigned int chunk_size;
 145     int chunk_type;
 146
 147     int i, j;
 148
 149     int color_packets;
 150     int color_changes;
 151     int color_shift;
 152     unsigned char r, g, b;
 153
 154     int lines;
 155     int compressed_lines;
 156     int starting_line;
 157     signed short line_packets;
 158     int y_ptr;
 159     int byte_run;
 160     int pixel_skip;
 161     int pixel_countdown;
 162     unsigned char *pixels;
 163     int pixel_limit;
 164
 165     s->frame.reference = 1;
 166     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 167     if (avctx->reget_buffer(avctx, &s->frame) < 0) {
 168         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 169         return -1;
 170     }
 171
 172     pixels = s->frame.data[0];
 173     pixel_limit = s->avctx->height * s->frame.linesize[0];
 174
 175     frame_size = AV_RL32(&buf[stream_ptr]);
 176     stream_ptr += 6;  /* skip the magic number */
 177     num_chunks = AV_RL16(&buf[stream_ptr]);
 178     stream_ptr += 10;  /* skip padding */
 179
 180     frame_size -= 16;
 181
 182     /* iterate through the chunks */
 183     while ((frame_size > 0) && (num_chunks > 0)) {
 184         chunk_size = AV_RL32(&buf[stream_ptr]);
 185         stream_ptr += 4;
 186         chunk_type = AV_RL16(&buf[stream_ptr]);
 187         stream_ptr += 2;
 188
 189         switch (chunk_type) {
 190         case FLI_256_COLOR:
 191         case FLI_COLOR:
 192             stream_ptr_after_color_chunk = stream_ptr + chunk_size - 6;
 193
 194             /* check special case: If this file is from the Magic Carpet
 195              * game and uses 6-bit colors even though it reports 256-color
 196              * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
 197              * initialization) */
 198             if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
 199                 color_shift = 0;
 200             else
 201                 color_shift = 2;
 202             /* set up the palette */
 203             color_packets = AV_RL16(&buf[stream_ptr]);
 204             stream_ptr += 2;
 205             palette_ptr = 0;
 206             for (i = 0; i < color_packets; i++) {
 207                 /* first byte is how many colors to skip */
 208                 palette_ptr += buf[stream_ptr++];
 209
 210                 /* next byte indicates how many entries to change */
 211                 color_changes = buf[stream_ptr++];
 212
 213                 /* if there are 0 color changes, there are actually 256 */
 214                 if (color_changes == 0)
 215                     color_changes = 256;
 216
 217                 for (j = 0; j < color_changes; j++) {
 218                     unsigned int entry;
 219
 220                     /* wrap around, for good measure */
 221                     if ((unsigned)palette_ptr >= 256)
 222                         palette_ptr = 0;
 223
 224                     r = buf[stream_ptr++] << color_shift;
 225                     g = buf[stream_ptr++] << color_shift;
 226                     b = buf[stream_ptr++] << color_shift;
 227                     entry = (r << 16) | (g << 8) | b;
 228                     if (s->palette[palette_ptr] != entry)
 229                         s->new_palette = 1;
 230                     s->palette[palette_ptr++] = entry;
 231                 }
 232             }
 233
 234             /* color chunks sometimes have weird 16-bit alignment issues;
 235              * therefore, take the hardline approach and set the stream_ptr
 236              * to the value calculated w.r.t. the size specified by the color
 237              * chunk header */
 238             stream_ptr = stream_ptr_after_color_chunk;
 239
 240             break;
 241
 242         case FLI_DELTA:
 243             y_ptr = 0;
 244             compressed_lines = AV_RL16(&buf[stream_ptr]);
 245             stream_ptr += 2;
 246             while (compressed_lines > 0) {
 247                 line_packets = AV_RL16(&buf[stream_ptr]);
 248                 stream_ptr += 2;
 249                 if ((line_packets & 0xC000) == 0xC000) {
 250                     // line skip opcode
 251                     line_packets = -line_packets;
 252                     y_ptr += line_packets * s->frame.linesize[0];
 253                 } else if ((line_packets & 0xC000) == 0x4000) {
 254                     av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);
 255                 } else if ((line_packets & 0xC000) == 0x8000) {
 256                     // "last byte" opcode
 257                     pixels[y_ptr + s->frame.linesize[0] - 1] = line_packets & 0xff;
 258                 } else {
 259                     compressed_lines--;
 260                     pixel_ptr = y_ptr;
 261                     pixel_countdown = s->avctx->width;
 262                     for (i = 0; i < line_packets; i++) {
 263                         /* account for the skip bytes */
 264                         pixel_skip = buf[stream_ptr++];
 265                         pixel_ptr += pixel_skip;
 266                         pixel_countdown -= pixel_skip;
 267                         byte_run = (signed char)(buf[stream_ptr++]);
 268                         if (byte_run < 0) {
 269                             byte_run = -byte_run;
 270                             palette_idx1 = buf[stream_ptr++];
 271                             palette_idx2 = buf[stream_ptr++];
 272                             CHECK_PIXEL_PTR(byte_run);
 273                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
 274                                 pixels[pixel_ptr++] = palette_idx1;
 275                                 pixels[pixel_ptr++] = palette_idx2;
 276                             }
 277                         } else {
 278                             CHECK_PIXEL_PTR(byte_run * 2);
 279                             for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
 280                                 palette_idx1 = buf[stream_ptr++];
 281                                 pixels[pixel_ptr++] = palette_idx1;
 282                             }
 283                         }
 284                     }
 285
 286                     y_ptr += s->frame.linesize[0];
 287                 }
 288             }
 289             break;
 290
 291         case FLI_LC:
 292             /* line compressed */
 293             starting_line = AV_RL16(&buf[stream_ptr]);
 294             stream_ptr += 2;
 295             y_ptr = 0;
 296             y_ptr += starting_line * s->frame.linesize[0];
 297
 298             compressed_lines = AV_RL16(&buf[stream_ptr]);
 299             stream_ptr += 2;
 300             while (compressed_lines > 0) {
 301                 pixel_ptr = y_ptr;
 302                 pixel_countdown = s->avctx->width;
 303                 line_packets = buf[stream_ptr++];
 304                 if (line_packets > 0) {
 305                     for (i = 0; i < line_packets; i++) {
 306                         /* account for the skip bytes */
 307                         pixel_skip = buf[stream_ptr++];
 308                         pixel_ptr += pixel_skip;
 309                         pixel_countdown -= pixel_skip;
 310                         byte_run = (signed char)(buf[stream_ptr++]);
 311                         if (byte_run > 0) {
 312                             CHECK_PIXEL_PTR(byte_run);
 313                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 314                                 palette_idx1 = buf[stream_ptr++];
 315                                 pixels[pixel_ptr++] = palette_idx1;
 316                             }
 317                         } else if (byte_run < 0) {
 318                             byte_run = -byte_run;
 319                             palette_idx1 = buf[stream_ptr++];
 320                             CHECK_PIXEL_PTR(byte_run);
 321                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 322                                 pixels[pixel_ptr++] = palette_idx1;
 323                             }
 324                         }
 325                     }
 326                 }
 327
 328                 y_ptr += s->frame.linesize[0];
 329                 compressed_lines--;
 330             }
 331             break;
 332
 333         case FLI_BLACK:
 334             /* set the whole frame to color 0 (which is usually black) */
 335             memset(pixels, 0,
 336                 s->frame.linesize[0] * s->avctx->height);
 337             break;
 338
 339         case FLI_BRUN:
 340             /* Byte run compression: This chunk type only occurs in the first
 341              * FLI frame and it will update the entire frame. */
 342             y_ptr = 0;
 343             for (lines = 0; lines < s->avctx->height; lines++) {
 344                 pixel_ptr = y_ptr;
 345                 /* disregard the line packets; instead, iterate through all
 346                  * pixels on a row */
 347                 stream_ptr++;
 348                 pixel_countdown = s->avctx->width;
 349                 while (pixel_countdown > 0) {
 350                     byte_run = (signed char)(buf[stream_ptr++]);
 351                     if (byte_run > 0) {
 352                         palette_idx1 = buf[stream_ptr++];
 353                         CHECK_PIXEL_PTR(byte_run);
 354                         for (j = 0; j < byte_run; j++) {
 355                             pixels[pixel_ptr++] = palette_idx1;
 356                             pixel_countdown--;
 357                             if (pixel_countdown < 0)
 358                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 359                                        pixel_countdown, lines);
 360                         }
 361                     } else {  /* copy bytes if byte_run < 0 */
 362                         byte_run = -byte_run;
 363                         CHECK_PIXEL_PTR(byte_run);
 364                         for (j = 0; j < byte_run; j++) {
 365                             palette_idx1 = buf[stream_ptr++];
 366                             pixels[pixel_ptr++] = palette_idx1;
 367                             pixel_countdown--;
 368                             if (pixel_countdown < 0)
 369                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 370                                        pixel_countdown, lines);
 371                         }
 372                     }
 373                 }
 374
 375                 y_ptr += s->frame.linesize[0];
 376             }
 377             break;
 378
 379         case FLI_COPY:
 380             /* copy the chunk (uncompressed frame) */
 381             if (chunk_size - 6 > s->avctx->width * s->avctx->height) {
 382                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
 383                        "bigger than image, skipping chunk\n", chunk_size - 6);
 384                 stream_ptr += chunk_size - 6;
 385             } else {
 386                 for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
 387                      y_ptr += s->frame.linesize[0]) {
 388                     memcpy(&pixels[y_ptr], &buf[stream_ptr],
 389                         s->avctx->width);
 390                     stream_ptr += s->avctx->width;
 391                 }
 392             }
 393             break;
 394
 395         case FLI_MINI:
 396             /* some sort of a thumbnail? disregard this chunk... */
 397             stream_ptr += chunk_size - 6;
 398             break;
 399
 400         default:
 401             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
 402             break;
 403         }
 404
 405         frame_size -= chunk_size;
 406         num_chunks--;
 407     }
 408
 409     /* by the end of the chunk, the stream ptr should equal the frame
 410      * size (minus 1, possibly); if it doesn't, issue a warning */
 411     if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
 412         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
 413                "and final chunk ptr = %d\n", buf_size, stream_ptr);
 414
 415     /* make the palette available on the way out */
 416     memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
 417     if (s->new_palette) {
 418         s->frame.palette_has_changed = 1;
 419         s->new_palette = 0;
 420     }
 421
 422     *data_size=sizeof(AVFrame);
 423     *(AVFrame*)data = s->frame;
 424
 425     return buf_size;
 426 }
 427
 428 static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
 429                                       void *data, int *data_size,
 430                                       const uint8_t *buf, int buf_size)
 431 {
 432     /* Note, the only difference between the 15Bpp and 16Bpp */
 433     /* Format is the pixel format, the packets are processed the same. */
 434     FlicDecodeContext *s = avctx->priv_data;
 435
 436     int stream_ptr = 0;
 437     int pixel_ptr;
 438     unsigned char palette_idx1;
 439
 440     unsigned int frame_size;
 441     int num_chunks;
 442
 443     unsigned int chunk_size;
 444     int chunk_type;
 445
 446     int i, j;
 447
 448     int lines;
 449     int compressed_lines;
 450     signed short line_packets;
 451     int y_ptr;
 452     int byte_run;
 453     int pixel_skip;
 454     int pixel_countdown;
 455     unsigned char *pixels;
 456     int pixel;
 457     int pixel_limit;
 458
 459     s->frame.reference = 1;
 460     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 461     if (avctx->reget_buffer(avctx, &s->frame) < 0) {
 462         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 463         return -1;
 464     }
 465
 466     pixels = s->frame.data[0];
 467     pixel_limit = s->avctx->height * s->frame.linesize[0];
 468
 469     frame_size = AV_RL32(&buf[stream_ptr]);
 470     stream_ptr += 6;  /* skip the magic number */
 471     num_chunks = AV_RL16(&buf[stream_ptr]);
 472     stream_ptr += 10;  /* skip padding */
 473
 474     frame_size -= 16;
 475
 476     /* iterate through the chunks */
 477     while ((frame_size > 0) && (num_chunks > 0)) {
 478         chunk_size = AV_RL32(&buf[stream_ptr]);
 479         stream_ptr += 4;
 480         chunk_type = AV_RL16(&buf[stream_ptr]);
 481         stream_ptr += 2;
 482
 483         switch (chunk_type) {
 484         case FLI_256_COLOR:
 485         case FLI_COLOR:
 486             /* For some reason, it seems that non-palettized flics do
 487              * include one of these chunks in their first frame.
 488              * Why I do not know, it seems rather extraneous. */
 489 /*            av_log(avctx, AV_LOG_ERROR, "Unexpected Palette chunk %d in non-paletised FLC\n",chunk_type);*/
 490             stream_ptr = stream_ptr + chunk_size - 6;
 491             break;
 492
 493         case FLI_DELTA:
 494         case FLI_DTA_LC:
 495             y_ptr = 0;
 496             compressed_lines = AV_RL16(&buf[stream_ptr]);
 497             stream_ptr += 2;
 498             while (compressed_lines > 0) {
 499                 line_packets = AV_RL16(&buf[stream_ptr]);
 500                 stream_ptr += 2;
 501                 if (line_packets < 0) {
 502                     line_packets = -line_packets;
 503                     y_ptr += line_packets * s->frame.linesize[0];
 504                 } else {
 505                     compressed_lines--;
 506                     pixel_ptr = y_ptr;
 507                     pixel_countdown = s->avctx->width;
 508                     for (i = 0; i < line_packets; i++) {
 509                         /* account for the skip bytes */
 510                         pixel_skip = buf[stream_ptr++];
 511                         pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
 512                         pixel_countdown -= pixel_skip;
 513                         byte_run = (signed char)(buf[stream_ptr++]);
 514                         if (byte_run < 0) {
 515                             byte_run = -byte_run;
 516                             pixel    = AV_RL16(&buf[stream_ptr]);
 517                             stream_ptr += 2;
 518                             CHECK_PIXEL_PTR(byte_run);
 519                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
 520                                 *((signed short*)(&pixels[pixel_ptr])) = pixel;
 521                                 pixel_ptr += 2;
 522                             }
 523                         } else {
 524                             CHECK_PIXEL_PTR(byte_run);
 525                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 526                                 *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[stream_ptr]);
 527                                 stream_ptr += 2;
 528                                 pixel_ptr += 2;
 529                             }
 530                         }
 531                     }
 532
 533                     y_ptr += s->frame.linesize[0];
 534                 }
 535             }
 536             break;
 537
 538         case FLI_LC:
 539             av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-paletised FLC\n");
 540             stream_ptr = stream_ptr + chunk_size - 6;
 541             break;
 542
 543         case FLI_BLACK:
 544             /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */
 545             memset(pixels, 0x0000,
 546                    s->frame.linesize[0] * s->avctx->height);
 547             break;
 548
 549         case FLI_BRUN:
 550             y_ptr = 0;
 551             for (lines = 0; lines < s->avctx->height; lines++) {
 552                 pixel_ptr = y_ptr;
 553                 /* disregard the line packets; instead, iterate through all
 554                  * pixels on a row */
 555                 stream_ptr++;
 556                 pixel_countdown = (s->avctx->width * 2);
 557
 558                 while (pixel_countdown > 0) {
 559                     byte_run = (signed char)(buf[stream_ptr++]);
 560                     if (byte_run > 0) {
 561                         palette_idx1 = buf[stream_ptr++];
 562                         CHECK_PIXEL_PTR(byte_run);
 563                         for (j = 0; j < byte_run; j++) {
 564                             pixels[pixel_ptr++] = palette_idx1;
 565                             pixel_countdown--;
 566                             if (pixel_countdown < 0)
 567                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
 568                                        pixel_countdown, lines);
 569                         }
 570                     } else {  /* copy bytes if byte_run < 0 */
 571                         byte_run = -byte_run;
 572                         CHECK_PIXEL_PTR(byte_run);
 573                         for (j = 0; j < byte_run; j++) {
 574                             palette_idx1 = buf[stream_ptr++];
 575                             pixels[pixel_ptr++] = palette_idx1;
 576                             pixel_countdown--;
 577                             if (pixel_countdown < 0)
 578                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 579                                        pixel_countdown, lines);
 580                         }
 581                     }
 582                 }
 583
 584                 /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
 585                  * This does not give us any good oportunity to perform word endian conversion
 586                  * during decompression. So if it is required (i.e., this is not a LE target, we do
 587                  * a second pass over the line here, swapping the bytes.
 588                  */
 589 #ifdef WORDS_BIGENDIAN
 590                 pixel_ptr = y_ptr;
 591                 pixel_countdown = s->avctx->width;
 592                 while (pixel_countdown > 0) {
 593                     *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]);
 594                     pixel_ptr += 2;
 595                 }
 596 #endif
 597                 y_ptr += s->frame.linesize[0];
 598             }
 599             break;
 600
 601         case FLI_DTA_BRUN:
 602             y_ptr = 0;
 603             for (lines = 0; lines < s->avctx->height; lines++) {
 604                 pixel_ptr = y_ptr;
 605                 /* disregard the line packets; instead, iterate through all
 606                  * pixels on a row */
 607                 stream_ptr++;
 608                 pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
 609
 610                 while (pixel_countdown > 0) {
 611                     byte_run = (signed char)(buf[stream_ptr++]);
 612                     if (byte_run > 0) {
 613                         pixel    = AV_RL16(&buf[stream_ptr]);
 614                         stream_ptr += 2;
 615                         CHECK_PIXEL_PTR(byte_run);
 616                         for (j = 0; j < byte_run; j++) {
 617                             *((signed short*)(&pixels[pixel_ptr])) = pixel;
 618                             pixel_ptr += 2;
 619                             pixel_countdown--;
 620                             if (pixel_countdown < 0)
 621                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 622                                        pixel_countdown);
 623                         }
 624                     } else {  /* copy pixels if byte_run < 0 */
 625                         byte_run = -byte_run;
 626                         CHECK_PIXEL_PTR(byte_run);
 627                         for (j = 0; j < byte_run; j++) {
 628                             *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[stream_ptr]);
 629                             stream_ptr += 2;
 630                             pixel_ptr  += 2;
 631                             pixel_countdown--;
 632                             if (pixel_countdown < 0)
 633                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 634                                        pixel_countdown);
 635                         }
 636                     }
 637                 }
 638
 639                 y_ptr += s->frame.linesize[0];
 640             }
 641             break;
 642
 643         case FLI_COPY:
 644         case FLI_DTA_COPY:
 645             /* copy the chunk (uncompressed frame) */
 646             if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {
 647                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
 648                        "bigger than image, skipping chunk\n", chunk_size - 6);
 649                 stream_ptr += chunk_size - 6;
 650             } else {
 651
 652                 for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
 653                      y_ptr += s->frame.linesize[0]) {
 654
 655                     pixel_countdown = s->avctx->width;
 656                     pixel_ptr = 0;
 657                     while (pixel_countdown > 0) {
 658                       *((signed short*)(&pixels[y_ptr + pixel_ptr])) = AV_RL16(&buf[stream_ptr+pixel_ptr]);
 659                       pixel_ptr += 2;
 660                       pixel_countdown--;
 661                     }
 662                     stream_ptr += s->avctx->width*2;
 663                 }
 664             }
 665             break;
 666
 667         case FLI_MINI:
 668             /* some sort of a thumbnail? disregard this chunk... */
 669             stream_ptr += chunk_size - 6;
 670             break;
 671
 672         default:
 673             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
 674             break;
 675         }
 676
 677         frame_size -= chunk_size;
 678         num_chunks--;
 679     }
 680
 681     /* by the end of the chunk, the stream ptr should equal the frame
 682      * size (minus 1, possibly); if it doesn't, issue a warning */
 683     if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
 684         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
 685                "and final chunk ptr = %d\n", buf_size, stream_ptr);
 686
 687
 688     *data_size=sizeof(AVFrame);
 689     *(AVFrame*)data = s->frame;
 690
 691     return buf_size;
 692 }
 693
 694 static int flic_decode_frame_24BPP(AVCodecContext *avctx,
 695                                    void *data, int *data_size,
 696                                    const uint8_t *buf, int buf_size)
 697 {
 698   av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
 699   return -1;
 700 }
 701
 702 static int flic_decode_frame(AVCodecContext *avctx,
 703                              void *data, int *data_size,
 704                              const uint8_t *buf, int buf_size)
 705 {
 706     if (avctx->pix_fmt == PIX_FMT_PAL8) {
 707       return flic_decode_frame_8BPP(avctx, data, data_size,
 708                                     buf, buf_size);
 709     }
 710     else if ((avctx->pix_fmt == PIX_FMT_RGB555) ||
 711              (avctx->pix_fmt == PIX_FMT_RGB565)) {
 712       return flic_decode_frame_15_16BPP(avctx, data, data_size,
 713                                         buf, buf_size);
 714     }
 715     else if (avctx->pix_fmt == PIX_FMT_BGR24) {
 716       return flic_decode_frame_24BPP(avctx, data, data_size,
 717                                      buf, buf_size);
 718     }
 719
 720     /* Should not get  here, ever as the pix_fmt is processed */
 721     /* in flic_decode_init and the above if should deal with */
 722     /* the finite set of possibilites allowable by here. */
 723     /* But in case we do, just error out. */
 724     av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");
 725     return -1;
 726 }
 727
 728
 729 static av_cold int flic_decode_end(AVCodecContext *avctx)
 730 {
 731     FlicDecodeContext *s = avctx->priv_data;
 732
 733     if (s->frame.data[0])
 734         avctx->release_buffer(avctx, &s->frame);
 735
 736     return 0;
 737 }
 738
 739 AVCodec flic_decoder = {
 740     "flic",
 741     CODEC_TYPE_VIDEO,
 742     CODEC_ID_FLIC,
 743     sizeof(FlicDecodeContext),
 744     flic_decode_init,
 745     NULL,
 746     flic_decode_end,
 747     flic_decode_frame,
 748     CODEC_CAP_DR1,
 749     NULL,
 750     NULL,
 751     NULL,
 752     NULL,
 753     .long_name = "Autodesk Animator Flic video",
 754 };