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 libavcodec/flicvideo.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
  42 #include "libavutil/intreadwrite.h"
  43 #include "avcodec.h"
  44
  45 #define FLI_256_COLOR 4
  46 #define FLI_DELTA     7
  47 #define FLI_COLOR     11
  48 #define FLI_LC        12
  49 #define FLI_BLACK     13
  50 #define FLI_BRUN      15
  51 #define FLI_COPY      16
  52 #define FLI_MINI      18
  53 #define FLI_DTA_BRUN  25
  54 #define FLI_DTA_COPY  26
  55 #define FLI_DTA_LC    27
  56
  57 #define FLI_TYPE_CODE     (0xAF11)
  58 #define FLC_FLX_TYPE_CODE (0xAF12)
  59 #define FLC_DTA_TYPE_CODE (0xAF44) /* Marks an "Extended FLC" comes from Dave's Targa Animator (DTA) */
  60 #define FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE (0xAF13)
  61
  62 #define CHECK_PIXEL_PTR(n) \
  63     if (pixel_ptr + n > pixel_limit) { \
  64         av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr >= pixel_limit (%d >= %d)\n", \
  65         pixel_ptr + n, pixel_limit); \
  66         return -1; \
  67     } \
  68
  69 typedef struct FlicDecodeContext {
  70     AVCodecContext *avctx;
  71     AVFrame frame;
  72
  73     unsigned int palette[256];
  74     int new_palette;
  75     int fli_type;  /* either 0xAF11 or 0xAF12, affects palette resolution */
  76 } FlicDecodeContext;
  77
  78 static av_cold int flic_decode_init(AVCodecContext *avctx)
  79 {
  80     FlicDecodeContext *s = avctx->priv_data;
  81     unsigned char *fli_header = (unsigned char *)avctx->extradata;
  82     int depth;
  83
  84     s->avctx = avctx;
  85
  86     s->fli_type = AV_RL16(&fli_header[4]); /* Might be overridden if a Magic Carpet FLC */
  87
  88     depth = 0;
  89     if (s->avctx->extradata_size == 12) {
  90         /* special case for magic carpet FLIs */
  91         s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE;
  92         depth = 8;
  93     } else if (s->avctx->extradata_size != 128) {
  94         av_log(avctx, AV_LOG_ERROR, "Expected extradata of 12 or 128 bytes\n");
  95         return -1;
  96     } else {
  97         depth = AV_RL16(&fli_header[12]);
  98     }
  99
 100     if (depth == 0) {
 101         depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
 102     }
 103
 104     if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
 105         depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
 106     }
 107
 108     switch (depth) {
 109         case 8  : avctx->pix_fmt = PIX_FMT_PAL8; break;
 110         case 15 : avctx->pix_fmt = PIX_FMT_RGB555; break;
 111         case 16 : avctx->pix_fmt = PIX_FMT_RGB565; break;
 112         case 24 : avctx->pix_fmt = PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */
 113                   av_log(avctx, AV_LOG_ERROR, "24Bpp FLC/FLX is unsupported due to no test files.\n");
 114                   return -1;
 115                   break;
 116         default :
 117                   av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
 118                   return -1;
 119     }
 120
 121     s->frame.data[0] = NULL;
 122     s->new_palette = 0;
 123
 124     return 0;
 125 }
 126
 127 static int flic_decode_frame_8BPP(AVCodecContext *avctx,
 128                                   void *data, int *data_size,
 129                                   const uint8_t *buf, int buf_size)
 130 {
 131     FlicDecodeContext *s = avctx->priv_data;
 132
 133     int stream_ptr = 0;
 134     int stream_ptr_after_color_chunk;
 135     int pixel_ptr;
 136     int palette_ptr;
 137     unsigned char palette_idx1;
 138     unsigned char palette_idx2;
 139
 140     unsigned int frame_size;
 141     int num_chunks;
 142
 143     unsigned int chunk_size;
 144     int chunk_type;
 145
 146     int i, j;
 147
 148     int color_packets;
 149     int color_changes;
 150     int color_shift;
 151     unsigned char r, g, b;
 152
 153     int lines;
 154     int compressed_lines;
 155     int starting_line;
 156     signed short line_packets;
 157     int y_ptr;
 158     int byte_run;
 159     int pixel_skip;
 160     int pixel_countdown;
 161     unsigned char *pixels;
 162     int pixel_limit;
 163
 164     s->frame.reference = 1;
 165     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 166     if (avctx->reget_buffer(avctx, &s->frame) < 0) {
 167         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 168         return -1;
 169     }
 170
 171     pixels = s->frame.data[0];
 172     pixel_limit = s->avctx->height * s->frame.linesize[0];
 173
 174     frame_size = AV_RL32(&buf[stream_ptr]);
 175     stream_ptr += 6;  /* skip the magic number */
 176     num_chunks = AV_RL16(&buf[stream_ptr]);
 177     stream_ptr += 10;  /* skip padding */
 178
 179     frame_size -= 16;
 180
 181     /* iterate through the chunks */
 182     while ((frame_size > 0) && (num_chunks > 0)) {
 183         chunk_size = AV_RL32(&buf[stream_ptr]);
 184         stream_ptr += 4;
 185         chunk_type = AV_RL16(&buf[stream_ptr]);
 186         stream_ptr += 2;
 187
 188         switch (chunk_type) {
 189         case FLI_256_COLOR:
 190         case FLI_COLOR:
 191             stream_ptr_after_color_chunk = stream_ptr + chunk_size - 6;
 192
 193             /* check special case: If this file is from the Magic Carpet
 194              * game and uses 6-bit colors even though it reports 256-color
 195              * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
 196              * initialization) */
 197             if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
 198                 color_shift = 0;
 199             else
 200                 color_shift = 2;
 201             /* set up the palette */
 202             color_packets = AV_RL16(&buf[stream_ptr]);
 203             stream_ptr += 2;
 204             palette_ptr = 0;
 205             for (i = 0; i < color_packets; i++) {
 206                 /* first byte is how many colors to skip */
 207                 palette_ptr += buf[stream_ptr++];
 208
 209                 /* next byte indicates how many entries to change */
 210                 color_changes = buf[stream_ptr++];
 211
 212                 /* if there are 0 color changes, there are actually 256 */
 213                 if (color_changes == 0)
 214                     color_changes = 256;
 215
 216                 for (j = 0; j < color_changes; j++) {
 217                     unsigned int entry;
 218
 219                     /* wrap around, for good measure */
 220                     if ((unsigned)palette_ptr >= 256)
 221                         palette_ptr = 0;
 222
 223                     r = buf[stream_ptr++] << color_shift;
 224                     g = buf[stream_ptr++] << color_shift;
 225                     b = buf[stream_ptr++] << color_shift;
 226                     entry = (r << 16) | (g << 8) | b;
 227                     if (s->palette[palette_ptr] != entry)
 228                         s->new_palette = 1;
 229                     s->palette[palette_ptr++] = entry;
 230                 }
 231             }
 232
 233             /* color chunks sometimes have weird 16-bit alignment issues;
 234              * therefore, take the hardline approach and set the stream_ptr
 235              * to the value calculated w.r.t. the size specified by the color
 236              * chunk header */
 237             stream_ptr = stream_ptr_after_color_chunk;
 238
 239             break;
 240
 241         case FLI_DELTA:
 242             y_ptr = 0;
 243             compressed_lines = AV_RL16(&buf[stream_ptr]);
 244             stream_ptr += 2;
 245             while (compressed_lines > 0) {
 246                 line_packets = AV_RL16(&buf[stream_ptr]);
 247                 stream_ptr += 2;
 248                 if ((line_packets & 0xC000) == 0xC000) {
 249                     // line skip opcode
 250                     line_packets = -line_packets;
 251                     y_ptr += line_packets * s->frame.linesize[0];
 252                 } else if ((line_packets & 0xC000) == 0x4000) {
 253                     av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);
 254                 } else if ((line_packets & 0xC000) == 0x8000) {
 255                     // "last byte" opcode
 256                     pixels[y_ptr + s->frame.linesize[0] - 1] = line_packets & 0xff;
 257                 } else {
 258                     compressed_lines--;
 259                     pixel_ptr = y_ptr;
 260                     pixel_countdown = s->avctx->width;
 261                     for (i = 0; i < line_packets; i++) {
 262                         /* account for the skip bytes */
 263                         pixel_skip = buf[stream_ptr++];
 264                         pixel_ptr += pixel_skip;
 265                         pixel_countdown -= pixel_skip;
 266                         byte_run = (signed char)(buf[stream_ptr++]);
 267                         if (byte_run < 0) {
 268                             byte_run = -byte_run;
 269                             palette_idx1 = buf[stream_ptr++];
 270                             palette_idx2 = buf[stream_ptr++];
 271                             CHECK_PIXEL_PTR(byte_run);
 272                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
 273                                 pixels[pixel_ptr++] = palette_idx1;
 274                                 pixels[pixel_ptr++] = palette_idx2;
 275                             }
 276                         } else {
 277                             CHECK_PIXEL_PTR(byte_run * 2);
 278                             for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
 279                                 palette_idx1 = buf[stream_ptr++];
 280                                 pixels[pixel_ptr++] = palette_idx1;
 281                             }
 282                         }
 283                     }
 284
 285                     y_ptr += s->frame.linesize[0];
 286                 }
 287             }
 288             break;
 289
 290         case FLI_LC:
 291             /* line compressed */
 292             starting_line = AV_RL16(&buf[stream_ptr]);
 293             stream_ptr += 2;
 294             y_ptr = 0;
 295             y_ptr += starting_line * s->frame.linesize[0];
 296
 297             compressed_lines = AV_RL16(&buf[stream_ptr]);
 298             stream_ptr += 2;
 299             while (compressed_lines > 0) {
 300                 pixel_ptr = y_ptr;
 301                 pixel_countdown = s->avctx->width;
 302                 line_packets = buf[stream_ptr++];
 303                 if (line_packets > 0) {
 304                     for (i = 0; i < line_packets; i++) {
 305                         /* account for the skip bytes */
 306                         pixel_skip = buf[stream_ptr++];
 307                         pixel_ptr += pixel_skip;
 308                         pixel_countdown -= pixel_skip;
 309                         byte_run = (signed char)(buf[stream_ptr++]);
 310                         if (byte_run > 0) {
 311                             CHECK_PIXEL_PTR(byte_run);
 312                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 313                                 palette_idx1 = buf[stream_ptr++];
 314                                 pixels[pixel_ptr++] = palette_idx1;
 315                             }
 316                         } else if (byte_run < 0) {
 317                             byte_run = -byte_run;
 318                             palette_idx1 = buf[stream_ptr++];
 319                             CHECK_PIXEL_PTR(byte_run);
 320                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 321                                 pixels[pixel_ptr++] = palette_idx1;
 322                             }
 323                         }
 324                     }
 325                 }
 326
 327                 y_ptr += s->frame.linesize[0];
 328                 compressed_lines--;
 329             }
 330             break;
 331
 332         case FLI_BLACK:
 333             /* set the whole frame to color 0 (which is usually black) */
 334             memset(pixels, 0,
 335                 s->frame.linesize[0] * s->avctx->height);
 336             break;
 337
 338         case FLI_BRUN:
 339             /* Byte run compression: This chunk type only occurs in the first
 340              * FLI frame and it will update the entire frame. */
 341             y_ptr = 0;
 342             for (lines = 0; lines < s->avctx->height; lines++) {
 343                 pixel_ptr = y_ptr;
 344                 /* disregard the line packets; instead, iterate through all
 345                  * pixels on a row */
 346                 stream_ptr++;
 347                 pixel_countdown = s->avctx->width;
 348                 while (pixel_countdown > 0) {
 349                     byte_run = (signed char)(buf[stream_ptr++]);
 350                     if (byte_run > 0) {
 351                         palette_idx1 = buf[stream_ptr++];
 352                         CHECK_PIXEL_PTR(byte_run);
 353                         for (j = 0; j < byte_run; j++) {
 354                             pixels[pixel_ptr++] = palette_idx1;
 355                             pixel_countdown--;
 356                             if (pixel_countdown < 0)
 357                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 358                                        pixel_countdown, lines);
 359                         }
 360                     } else {  /* copy bytes if byte_run < 0 */
 361                         byte_run = -byte_run;
 362                         CHECK_PIXEL_PTR(byte_run);
 363                         for (j = 0; j < byte_run; j++) {
 364                             palette_idx1 = buf[stream_ptr++];
 365                             pixels[pixel_ptr++] = palette_idx1;
 366                             pixel_countdown--;
 367                             if (pixel_countdown < 0)
 368                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 369                                        pixel_countdown, lines);
 370                         }
 371                     }
 372                 }
 373
 374                 y_ptr += s->frame.linesize[0];
 375             }
 376             break;
 377
 378         case FLI_COPY:
 379             /* copy the chunk (uncompressed frame) */
 380             if (chunk_size - 6 > s->avctx->width * s->avctx->height) {
 381                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
 382                        "bigger than image, skipping chunk\n", chunk_size - 6);
 383                 stream_ptr += chunk_size - 6;
 384             } else {
 385                 for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
 386                      y_ptr += s->frame.linesize[0]) {
 387                     memcpy(&pixels[y_ptr], &buf[stream_ptr],
 388                         s->avctx->width);
 389                     stream_ptr += s->avctx->width;
 390                 }
 391             }
 392             break;
 393
 394         case FLI_MINI:
 395             /* some sort of a thumbnail? disregard this chunk... */
 396             stream_ptr += chunk_size - 6;
 397             break;
 398
 399         default:
 400             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
 401             break;
 402         }
 403
 404         frame_size -= chunk_size;
 405         num_chunks--;
 406     }
 407
 408     /* by the end of the chunk, the stream ptr should equal the frame
 409      * size (minus 1, possibly); if it doesn't, issue a warning */
 410     if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
 411         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
 412                "and final chunk ptr = %d\n", buf_size, stream_ptr);
 413
 414     /* make the palette available on the way out */
 415     memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
 416     if (s->new_palette) {
 417         s->frame.palette_has_changed = 1;
 418         s->new_palette = 0;
 419     }
 420
 421     *data_size=sizeof(AVFrame);
 422     *(AVFrame*)data = s->frame;
 423
 424     return buf_size;
 425 }
 426
 427 static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
 428                                       void *data, int *data_size,
 429                                       const uint8_t *buf, int buf_size)
 430 {
 431     /* Note, the only difference between the 15Bpp and 16Bpp */
 432     /* Format is the pixel format, the packets are processed the same. */
 433     FlicDecodeContext *s = avctx->priv_data;
 434
 435     int stream_ptr = 0;
 436     int pixel_ptr;
 437     unsigned char palette_idx1;
 438
 439     unsigned int frame_size;
 440     int num_chunks;
 441
 442     unsigned int chunk_size;
 443     int chunk_type;
 444
 445     int i, j;
 446
 447     int lines;
 448     int compressed_lines;
 449     signed short line_packets;
 450     int y_ptr;
 451     int byte_run;
 452     int pixel_skip;
 453     int pixel_countdown;
 454     unsigned char *pixels;
 455     int pixel;
 456     int pixel_limit;
 457
 458     s->frame.reference = 1;
 459     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 460     if (avctx->reget_buffer(avctx, &s->frame) < 0) {
 461         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 462         return -1;
 463     }
 464
 465     pixels = s->frame.data[0];
 466     pixel_limit = s->avctx->height * s->frame.linesize[0];
 467
 468     frame_size = AV_RL32(&buf[stream_ptr]);
 469     stream_ptr += 6;  /* skip the magic number */
 470     num_chunks = AV_RL16(&buf[stream_ptr]);
 471     stream_ptr += 10;  /* skip padding */
 472
 473     frame_size -= 16;
 474
 475     /* iterate through the chunks */
 476     while ((frame_size > 0) && (num_chunks > 0)) {
 477         chunk_size = AV_RL32(&buf[stream_ptr]);
 478         stream_ptr += 4;
 479         chunk_type = AV_RL16(&buf[stream_ptr]);
 480         stream_ptr += 2;
 481
 482         switch (chunk_type) {
 483         case FLI_256_COLOR:
 484         case FLI_COLOR:
 485             /* For some reason, it seems that non-palettized flics do
 486              * include one of these chunks in their first frame.
 487              * Why I do not know, it seems rather extraneous. */
 488 /*            av_log(avctx, AV_LOG_ERROR, "Unexpected Palette chunk %d in non-paletised FLC\n",chunk_type);*/
 489             stream_ptr = stream_ptr + chunk_size - 6;
 490             break;
 491
 492         case FLI_DELTA:
 493         case FLI_DTA_LC:
 494             y_ptr = 0;
 495             compressed_lines = AV_RL16(&buf[stream_ptr]);
 496             stream_ptr += 2;
 497             while (compressed_lines > 0) {
 498                 line_packets = AV_RL16(&buf[stream_ptr]);
 499                 stream_ptr += 2;
 500                 if (line_packets < 0) {
 501                     line_packets = -line_packets;
 502                     y_ptr += line_packets * s->frame.linesize[0];
 503                 } else {
 504                     compressed_lines--;
 505                     pixel_ptr = y_ptr;
 506                     pixel_countdown = s->avctx->width;
 507                     for (i = 0; i < line_packets; i++) {
 508                         /* account for the skip bytes */
 509                         pixel_skip = buf[stream_ptr++];
 510                         pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
 511                         pixel_countdown -= pixel_skip;
 512                         byte_run = (signed char)(buf[stream_ptr++]);
 513                         if (byte_run < 0) {
 514                             byte_run = -byte_run;
 515                             pixel    = AV_RL16(&buf[stream_ptr]);
 516                             stream_ptr += 2;
 517                             CHECK_PIXEL_PTR(byte_run);
 518                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
 519                                 *((signed short*)(&pixels[pixel_ptr])) = pixel;
 520                                 pixel_ptr += 2;
 521                             }
 522                         } else {
 523                             CHECK_PIXEL_PTR(byte_run);
 524                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 525                                 *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[stream_ptr]);
 526                                 stream_ptr += 2;
 527                                 pixel_ptr += 2;
 528                             }
 529                         }
 530                     }
 531
 532                     y_ptr += s->frame.linesize[0];
 533                 }
 534             }
 535             break;
 536
 537         case FLI_LC:
 538             av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-paletised FLC\n");
 539             stream_ptr = stream_ptr + chunk_size - 6;
 540             break;
 541
 542         case FLI_BLACK:
 543             /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */
 544             memset(pixels, 0x0000,
 545                    s->frame.linesize[0] * s->avctx->height);
 546             break;
 547
 548         case FLI_BRUN:
 549             y_ptr = 0;
 550             for (lines = 0; lines < s->avctx->height; lines++) {
 551                 pixel_ptr = y_ptr;
 552                 /* disregard the line packets; instead, iterate through all
 553                  * pixels on a row */
 554                 stream_ptr++;
 555                 pixel_countdown = (s->avctx->width * 2);
 556
 557                 while (pixel_countdown > 0) {
 558                     byte_run = (signed char)(buf[stream_ptr++]);
 559                     if (byte_run > 0) {
 560                         palette_idx1 = buf[stream_ptr++];
 561                         CHECK_PIXEL_PTR(byte_run);
 562                         for (j = 0; j < byte_run; j++) {
 563                             pixels[pixel_ptr++] = palette_idx1;
 564                             pixel_countdown--;
 565                             if (pixel_countdown < 0)
 566                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
 567                                        pixel_countdown, lines);
 568                         }
 569                     } else {  /* copy bytes if byte_run < 0 */
 570                         byte_run = -byte_run;
 571                         CHECK_PIXEL_PTR(byte_run);
 572                         for (j = 0; j < byte_run; j++) {
 573                             palette_idx1 = buf[stream_ptr++];
 574                             pixels[pixel_ptr++] = palette_idx1;
 575                             pixel_countdown--;
 576                             if (pixel_countdown < 0)
 577                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 578                                        pixel_countdown, lines);
 579                         }
 580                     }
 581                 }
 582
 583                 /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
 584                  * This does not give us any good oportunity to perform word endian conversion
 585                  * during decompression. So if it is required (i.e., this is not a LE target, we do
 586                  * a second pass over the line here, swapping the bytes.
 587                  */
 588 #if HAVE_BIGENDIAN
 589                 pixel_ptr = y_ptr;
 590                 pixel_countdown = s->avctx->width;
 591                 while (pixel_countdown > 0) {
 592                     *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]);
 593                     pixel_ptr += 2;
 594                 }
 595 #endif
 596                 y_ptr += s->frame.linesize[0];
 597             }
 598             break;
 599
 600         case FLI_DTA_BRUN:
 601             y_ptr = 0;
 602             for (lines = 0; lines < s->avctx->height; lines++) {
 603                 pixel_ptr = y_ptr;
 604                 /* disregard the line packets; instead, iterate through all
 605                  * pixels on a row */
 606                 stream_ptr++;
 607                 pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
 608
 609                 while (pixel_countdown > 0) {
 610                     byte_run = (signed char)(buf[stream_ptr++]);
 611                     if (byte_run > 0) {
 612                         pixel    = AV_RL16(&buf[stream_ptr]);
 613                         stream_ptr += 2;
 614                         CHECK_PIXEL_PTR(byte_run);
 615                         for (j = 0; j < byte_run; j++) {
 616                             *((signed short*)(&pixels[pixel_ptr])) = pixel;
 617                             pixel_ptr += 2;
 618                             pixel_countdown--;
 619                             if (pixel_countdown < 0)
 620                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 621                                        pixel_countdown);
 622                         }
 623                     } else {  /* copy pixels if byte_run < 0 */
 624                         byte_run = -byte_run;
 625                         CHECK_PIXEL_PTR(byte_run);
 626                         for (j = 0; j < byte_run; j++) {
 627                             *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[stream_ptr]);
 628                             stream_ptr += 2;
 629                             pixel_ptr  += 2;
 630                             pixel_countdown--;
 631                             if (pixel_countdown < 0)
 632                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 633                                        pixel_countdown);
 634                         }
 635                     }
 636                 }
 637
 638                 y_ptr += s->frame.linesize[0];
 639             }
 640             break;
 641
 642         case FLI_COPY:
 643         case FLI_DTA_COPY:
 644             /* copy the chunk (uncompressed frame) */
 645             if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {
 646                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
 647                        "bigger than image, skipping chunk\n", chunk_size - 6);
 648                 stream_ptr += chunk_size - 6;
 649             } else {
 650
 651                 for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
 652                      y_ptr += s->frame.linesize[0]) {
 653
 654                     pixel_countdown = s->avctx->width;
 655                     pixel_ptr = 0;
 656                     while (pixel_countdown > 0) {
 657                       *((signed short*)(&pixels[y_ptr + pixel_ptr])) = AV_RL16(&buf[stream_ptr+pixel_ptr]);
 658                       pixel_ptr += 2;
 659                       pixel_countdown--;
 660                     }
 661                     stream_ptr += s->avctx->width*2;
 662                 }
 663             }
 664             break;
 665
 666         case FLI_MINI:
 667             /* some sort of a thumbnail? disregard this chunk... */
 668             stream_ptr += chunk_size - 6;
 669             break;
 670
 671         default:
 672             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
 673             break;
 674         }
 675
 676         frame_size -= chunk_size;
 677         num_chunks--;
 678     }
 679
 680     /* by the end of the chunk, the stream ptr should equal the frame
 681      * size (minus 1, possibly); if it doesn't, issue a warning */
 682     if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
 683         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
 684                "and final chunk ptr = %d\n", buf_size, stream_ptr);
 685
 686
 687     *data_size=sizeof(AVFrame);
 688     *(AVFrame*)data = s->frame;
 689
 690     return buf_size;
 691 }
 692
 693 static int flic_decode_frame_24BPP(AVCodecContext *avctx,
 694                                    void *data, int *data_size,
 695                                    const uint8_t *buf, int buf_size)
 696 {
 697   av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
 698   return -1;
 699 }
 700
 701 static int flic_decode_frame(AVCodecContext *avctx,
 702                              void *data, int *data_size,
 703                              AVPacket *avpkt)
 704 {
 705     const uint8_t *buf = avpkt->data;
 706     int buf_size = avpkt->size;
 707     if (avctx->pix_fmt == PIX_FMT_PAL8) {
 708       return flic_decode_frame_8BPP(avctx, data, data_size,
 709                                     buf, buf_size);
 710     }
 711     else if ((avctx->pix_fmt == PIX_FMT_RGB555) ||
 712              (avctx->pix_fmt == PIX_FMT_RGB565)) {
 713       return flic_decode_frame_15_16BPP(avctx, data, data_size,
 714                                         buf, buf_size);
 715     }
 716     else if (avctx->pix_fmt == PIX_FMT_BGR24) {
 717       return flic_decode_frame_24BPP(avctx, data, data_size,
 718                                      buf, buf_size);
 719     }
 720
 721     /* Should not get  here, ever as the pix_fmt is processed */
 722     /* in flic_decode_init and the above if should deal with */
 723     /* the finite set of possibilites allowable by here. */
 724     /* But in case we do, just error out. */
 725     av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");
 726     return -1;
 727 }
 728
 729
 730 static av_cold int flic_decode_end(AVCodecContext *avctx)
 731 {
 732     FlicDecodeContext *s = avctx->priv_data;
 733
 734     if (s->frame.data[0])
 735         avctx->release_buffer(avctx, &s->frame);
 736
 737     return 0;
 738 }
 739
 740 AVCodec flic_decoder = {
 741     "flic",
 742     CODEC_TYPE_VIDEO,
 743     CODEC_ID_FLIC,
 744     sizeof(FlicDecodeContext),
 745     flic_decode_init,
 746     NULL,
 747     flic_decode_end,
 748     flic_decode_frame,
 749     CODEC_CAP_DR1,
 750     NULL,
 751     NULL,
 752     NULL,
 753     NULL,
 754     .long_name = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"),
 755 };