libavcodec/flicvideo.c

   1 /*
   2  * FLI/FLC Animation Video Decoder
   3  * Copyright (C) 2003, 2004 the ffmpeg project
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  */
  20
  21 /**
  22  * @file flic.c
  23  * Autodesk Animator FLI/FLC Video Decoder
  24  * by Mike Melanson (melanson@pcisys.net)
  25  * for more information on the .fli/.flc file format and all of its many
  26  * variations, visit:
  27  *   http://www.compuphase.com/flic.htm
  28  *
  29  * This decoder outputs PAL8/RGB555/RGB565 and maybe one day RGB24
  30  * colorspace data, depending on the FLC. To use this decoder, be
  31  * sure that your demuxer sends the FLI file header to the decoder via
  32  * the extradata chunk in AVCodecContext. The chunk should be 128 bytes
  33  * large. The only exception is for FLI files from the game "Magic Carpet",
  34  * in which the header is only 12 bytes.
  35  */
  36
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41
  42 #include "common.h"
  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 int flic_decode_init(AVCodecContext *avctx)
  80 {
  81     FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
  82     unsigned char *fli_header = (unsigned char *)avctx->extradata;
  83     int depth;
  84
  85     s->avctx = avctx;
  86     avctx->has_b_frames = 0;
  87
  88     s->fli_type = LE_16(&fli_header[4]); /* Might be overridden if a Magic Carpet FLC */
  89     depth       = LE_16(&fli_header[12]);
  90
  91     if (depth == 0) {
  92       depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
  93     }
  94
  95     if (s->avctx->extradata_size == 12) {
  96         /* special case for magic carpet FLIs */
  97         s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE;
  98     } else if (s->avctx->extradata_size != 128) {
  99         av_log(avctx, AV_LOG_ERROR, "Expected extradata of 12 or 128 bytes\n");
 100         return -1;
 101     }
 102
 103     if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
 104         depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
 105     }
 106
 107     switch (depth) {
 108         case 8  : avctx->pix_fmt = PIX_FMT_PAL8; break;
 109         case 15 : avctx->pix_fmt = PIX_FMT_RGB555; break;
 110         case 16 : avctx->pix_fmt = PIX_FMT_RGB565; break;
 111         case 24 : avctx->pix_fmt = PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */
 112                   av_log(avctx, AV_LOG_ERROR, "24Bpp FLC/FLX is unsupported due to no test files.\n");
 113                   return -1;
 114                   break;
 115         default :
 116                   av_log(avctx, AV_LOG_ERROR, "Unkown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
 117                   return -1;
 118     }
 119
 120     s->frame.data[0] = NULL;
 121     s->new_palette = 0;
 122
 123     return 0;
 124 }
 125
 126 static int flic_decode_frame_8BPP(AVCodecContext *avctx,
 127                                   void *data, int *data_size,
 128                                   uint8_t *buf, int buf_size)
 129 {
 130     FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
 131
 132     int stream_ptr = 0;
 133     int stream_ptr_after_color_chunk;
 134     int pixel_ptr;
 135     int palette_ptr;
 136     unsigned char palette_idx1;
 137     unsigned char palette_idx2;
 138
 139     unsigned int frame_size;
 140     int num_chunks;
 141
 142     unsigned int chunk_size;
 143     int chunk_type;
 144
 145     int i, j;
 146
 147     int color_packets;
 148     int color_changes;
 149     int color_shift;
 150     unsigned char r, g, b;
 151
 152     int lines;
 153     int compressed_lines;
 154     int starting_line;
 155     signed short line_packets;
 156     int y_ptr;
 157     signed char byte_run;
 158     int pixel_skip;
 159     int pixel_countdown;
 160     unsigned char *pixels;
 161     int pixel_limit;
 162
 163     s->frame.reference = 1;
 164     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 165     if (avctx->reget_buffer(avctx, &s->frame) < 0) {
 166         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 167         return -1;
 168     }
 169
 170     pixels = s->frame.data[0];
 171     pixel_limit = s->avctx->height * s->frame.linesize[0];
 172
 173     frame_size = LE_32(&buf[stream_ptr]);
 174     stream_ptr += 6;  /* skip the magic number */
 175     num_chunks = LE_16(&buf[stream_ptr]);
 176     stream_ptr += 10;  /* skip padding */
 177
 178     frame_size -= 16;
 179
 180     /* iterate through the chunks */
 181     while ((frame_size > 0) && (num_chunks > 0)) {
 182         chunk_size = LE_32(&buf[stream_ptr]);
 183         stream_ptr += 4;
 184         chunk_type = LE_16(&buf[stream_ptr]);
 185         stream_ptr += 2;
 186
 187         switch (chunk_type) {
 188         case FLI_256_COLOR:
 189         case FLI_COLOR:
 190             stream_ptr_after_color_chunk = stream_ptr + chunk_size - 6;
 191             s->new_palette = 1;
 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 = LE_16(&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
 218                     /* wrap around, for good measure */
 219                     if ((unsigned)palette_ptr >= 256)
 220                         palette_ptr = 0;
 221
 222                     r = buf[stream_ptr++] << color_shift;
 223                     g = buf[stream_ptr++] << color_shift;
 224                     b = buf[stream_ptr++] << color_shift;
 225                     s->palette[palette_ptr++] = (r << 16) | (g << 8) | b;
 226                 }
 227             }
 228
 229             /* color chunks sometimes have weird 16-bit alignment issues;
 230              * therefore, take the hardline approach and set the stream_ptr
 231              * to the value calculated w.r.t. the size specified by the color
 232              * chunk header */
 233             stream_ptr = stream_ptr_after_color_chunk;
 234
 235             break;
 236
 237         case FLI_DELTA:
 238             y_ptr = 0;
 239             compressed_lines = LE_16(&buf[stream_ptr]);
 240             stream_ptr += 2;
 241             while (compressed_lines > 0) {
 242                 line_packets = LE_16(&buf[stream_ptr]);
 243                 stream_ptr += 2;
 244                 if (line_packets < 0) {
 245                     line_packets = -line_packets;
 246                     y_ptr += line_packets * s->frame.linesize[0];
 247                 } else {
 248                     compressed_lines--;
 249                     pixel_ptr = y_ptr;
 250                     pixel_countdown = s->avctx->width;
 251                     for (i = 0; i < line_packets; i++) {
 252                         /* account for the skip bytes */
 253                         pixel_skip = buf[stream_ptr++];
 254                         pixel_ptr += pixel_skip;
 255                         pixel_countdown -= pixel_skip;
 256                         byte_run = buf[stream_ptr++];
 257                         if (byte_run < 0) {
 258                             byte_run = -byte_run;
 259                             palette_idx1 = buf[stream_ptr++];
 260                             palette_idx2 = buf[stream_ptr++];
 261                             CHECK_PIXEL_PTR(byte_run);
 262                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
 263                                 pixels[pixel_ptr++] = palette_idx1;
 264                                 pixels[pixel_ptr++] = palette_idx2;
 265                             }
 266                         } else {
 267                             CHECK_PIXEL_PTR(byte_run * 2);
 268                             for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
 269                                 palette_idx1 = buf[stream_ptr++];
 270                                 pixels[pixel_ptr++] = palette_idx1;
 271                             }
 272                         }
 273                     }
 274
 275                     y_ptr += s->frame.linesize[0];
 276                 }
 277             }
 278             break;
 279
 280         case FLI_LC:
 281             /* line compressed */
 282             starting_line = LE_16(&buf[stream_ptr]);
 283             stream_ptr += 2;
 284             y_ptr = 0;
 285             y_ptr += starting_line * s->frame.linesize[0];
 286
 287             compressed_lines = LE_16(&buf[stream_ptr]);
 288             stream_ptr += 2;
 289             while (compressed_lines > 0) {
 290                 pixel_ptr = y_ptr;
 291                 pixel_countdown = s->avctx->width;
 292                 line_packets = buf[stream_ptr++];
 293                 if (line_packets > 0) {
 294                     for (i = 0; i < line_packets; i++) {
 295                         /* account for the skip bytes */
 296                         pixel_skip = buf[stream_ptr++];
 297                         pixel_ptr += pixel_skip;
 298                         pixel_countdown -= pixel_skip;
 299                         byte_run = buf[stream_ptr++];
 300                         if (byte_run > 0) {
 301                             CHECK_PIXEL_PTR(byte_run);
 302                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 303                                 palette_idx1 = buf[stream_ptr++];
 304                                 pixels[pixel_ptr++] = palette_idx1;
 305                             }
 306                         } else {
 307                             byte_run = -byte_run;
 308                             palette_idx1 = buf[stream_ptr++];
 309                             CHECK_PIXEL_PTR(byte_run);
 310                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 311                                 pixels[pixel_ptr++] = palette_idx1;
 312                             }
 313                         }
 314                     }
 315                 }
 316
 317                 y_ptr += s->frame.linesize[0];
 318                 compressed_lines--;
 319             }
 320             break;
 321
 322         case FLI_BLACK:
 323             /* set the whole frame to color 0 (which is usually black) */
 324             memset(pixels, 0,
 325                 s->frame.linesize[0] * s->avctx->height);
 326             break;
 327
 328         case FLI_BRUN:
 329             /* Byte run compression: This chunk type only occurs in the first
 330              * FLI frame and it will update the entire frame. */
 331             y_ptr = 0;
 332             for (lines = 0; lines < s->avctx->height; lines++) {
 333                 pixel_ptr = y_ptr;
 334                 /* disregard the line packets; instead, iterate through all
 335                  * pixels on a row */
 336                 stream_ptr++;
 337                 pixel_countdown = s->avctx->width;
 338                 while (pixel_countdown > 0) {
 339                     byte_run = buf[stream_ptr++];
 340                     if (byte_run > 0) {
 341                         palette_idx1 = buf[stream_ptr++];
 342                         CHECK_PIXEL_PTR(byte_run);
 343                         for (j = 0; j < byte_run; j++) {
 344                             pixels[pixel_ptr++] = palette_idx1;
 345                             pixel_countdown--;
 346                             if (pixel_countdown < 0)
 347                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 348                                        pixel_countdown);
 349                         }
 350                     } else {  /* copy bytes if byte_run < 0 */
 351                         byte_run = -byte_run;
 352                         CHECK_PIXEL_PTR(byte_run);
 353                         for (j = 0; j < byte_run; j++) {
 354                             palette_idx1 = buf[stream_ptr++];
 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)\n",
 359                                        pixel_countdown);
 360                         }
 361                     }
 362                 }
 363
 364                 y_ptr += s->frame.linesize[0];
 365             }
 366             break;
 367
 368         case FLI_COPY:
 369             /* copy the chunk (uncompressed frame) */
 370             if (chunk_size - 6 > s->avctx->width * s->avctx->height) {
 371                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
 372                        "bigger than image, skipping chunk\n", chunk_size - 6);
 373                 stream_ptr += chunk_size - 6;
 374             } else {
 375                 for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
 376                      y_ptr += s->frame.linesize[0]) {
 377                     memcpy(&pixels[y_ptr], &buf[stream_ptr],
 378                         s->avctx->width);
 379                     stream_ptr += s->avctx->width;
 380                 }
 381             }
 382             break;
 383
 384         case FLI_MINI:
 385             /* some sort of a thumbnail? disregard this chunk... */
 386             stream_ptr += chunk_size - 6;
 387             break;
 388
 389         default:
 390             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
 391             break;
 392         }
 393
 394         frame_size -= chunk_size;
 395         num_chunks--;
 396     }
 397
 398     /* by the end of the chunk, the stream ptr should equal the frame
 399      * size (minus 1, possibly); if it doesn't, issue a warning */
 400     if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
 401         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
 402                "and final chunk ptr = %d\n", buf_size, stream_ptr);
 403
 404     /* make the palette available on the way out */
 405 //    if (s->new_palette) {
 406     if (1) {
 407         memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
 408         s->frame.palette_has_changed = 1;
 409         s->new_palette = 0;
 410     }
 411
 412     *data_size=sizeof(AVFrame);
 413     *(AVFrame*)data = s->frame;
 414
 415     return buf_size;
 416 }
 417
 418 int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
 419                                       void *data, int *data_size,
 420                                       uint8_t *buf, int buf_size)
 421 {
 422     /* Note, the only difference between the 15Bpp and 16Bpp */
 423     /* Format is the pixel format, the packets are processed the same. */
 424     FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
 425
 426     int stream_ptr = 0;
 427     int pixel_ptr;
 428     unsigned char palette_idx1;
 429
 430     unsigned int frame_size;
 431     int num_chunks;
 432
 433     unsigned int chunk_size;
 434     int chunk_type;
 435
 436     int i, j;
 437
 438     int lines;
 439     int compressed_lines;
 440     signed short line_packets;
 441     int y_ptr;
 442     signed char byte_run;
 443     int pixel_skip;
 444     int pixel_countdown;
 445     unsigned char *pixels;
 446     int pixel;
 447     int pixel_limit;
 448
 449     s->frame.reference = 1;
 450     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 451     if (avctx->reget_buffer(avctx, &s->frame) < 0) {
 452         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 453         return -1;
 454     }
 455
 456     pixels = s->frame.data[0];
 457     pixel_limit = s->avctx->height * s->frame.linesize[0];
 458
 459     frame_size = LE_32(&buf[stream_ptr]);
 460     stream_ptr += 6;  /* skip the magic number */
 461     num_chunks = LE_16(&buf[stream_ptr]);
 462     stream_ptr += 10;  /* skip padding */
 463
 464     frame_size -= 16;
 465
 466     /* iterate through the chunks */
 467     while ((frame_size > 0) && (num_chunks > 0)) {
 468         chunk_size = LE_32(&buf[stream_ptr]);
 469         stream_ptr += 4;
 470         chunk_type = LE_16(&buf[stream_ptr]);
 471         stream_ptr += 2;
 472
 473         switch (chunk_type) {
 474         case FLI_256_COLOR:
 475         case FLI_COLOR:
 476             /* For some reason, it seems that non-paletised flics do include one of these */
 477             /* chunks in their first frame.  Why i do not know, it seems rather extraneous */
 478 /*            av_log(avctx, AV_LOG_ERROR, "Unexpected Palette chunk %d in non-paletised FLC\n",chunk_type);*/
 479             stream_ptr = stream_ptr + chunk_size - 6;
 480             break;
 481
 482         case FLI_DELTA:
 483         case FLI_DTA_LC:
 484             y_ptr = 0;
 485             compressed_lines = LE_16(&buf[stream_ptr]);
 486             stream_ptr += 2;
 487             while (compressed_lines > 0) {
 488                 line_packets = LE_16(&buf[stream_ptr]);
 489                 stream_ptr += 2;
 490                 if (line_packets < 0) {
 491                     line_packets = -line_packets;
 492                     y_ptr += line_packets * s->frame.linesize[0];
 493                 } else {
 494                     compressed_lines--;
 495                     pixel_ptr = y_ptr;
 496                     pixel_countdown = s->avctx->width;
 497                     for (i = 0; i < line_packets; i++) {
 498                         /* account for the skip bytes */
 499                         pixel_skip = buf[stream_ptr++];
 500                         pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
 501                         pixel_countdown -= pixel_skip;
 502                         byte_run = buf[stream_ptr++];
 503                         if (byte_run < 0) {
 504                             byte_run = -byte_run;
 505                             pixel    = LE_16(&buf[stream_ptr]);
 506                             stream_ptr += 2;
 507                             CHECK_PIXEL_PTR(byte_run);
 508                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
 509                                 *((signed short*)(&pixels[pixel_ptr])) = pixel;
 510                                 pixel_ptr += 2;
 511                             }
 512                         } else {
 513                             CHECK_PIXEL_PTR(byte_run);
 514                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 515                                 *((signed short*)(&pixels[pixel_ptr])) = LE_16(&buf[stream_ptr]);
 516                                 stream_ptr += 2;
 517                                 pixel_ptr += 2;
 518                             }
 519                         }
 520                     }
 521
 522                     y_ptr += s->frame.linesize[0];
 523                 }
 524             }
 525             break;
 526
 527         case FLI_LC:
 528             av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-paletised FLC\n");
 529             stream_ptr = stream_ptr + chunk_size - 6;
 530             break;
 531
 532         case FLI_BLACK:
 533             /* set the whole frame to 0x0000 which is balck in both 15Bpp and 16Bpp modes. */
 534             memset(pixels, 0x0000,
 535                    s->frame.linesize[0] * s->avctx->height * 2);
 536             break;
 537
 538         case FLI_BRUN:
 539             y_ptr = 0;
 540             for (lines = 0; lines < s->avctx->height; lines++) {
 541                 pixel_ptr = y_ptr;
 542                 /* disregard the line packets; instead, iterate through all
 543                  * pixels on a row */
 544                 stream_ptr++;
 545                 pixel_countdown = (s->avctx->width * 2);
 546
 547                 while (pixel_countdown > 0) {
 548                     byte_run = buf[stream_ptr++];
 549                     if (byte_run > 0) {
 550                         palette_idx1 = buf[stream_ptr++];
 551                         CHECK_PIXEL_PTR(byte_run);
 552                         for (j = 0; j < byte_run; j++) {
 553                             pixels[pixel_ptr++] = palette_idx1;
 554                             pixel_countdown--;
 555                             if (pixel_countdown < 0)
 556                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 557                                        pixel_countdown);
 558                         }
 559                     } else {  /* copy bytes if byte_run < 0 */
 560                         byte_run = -byte_run;
 561                         CHECK_PIXEL_PTR(byte_run);
 562                         for (j = 0; j < byte_run; j++) {
 563                             palette_idx1 = buf[stream_ptr++];
 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)\n",
 568                                        pixel_countdown);
 569                         }
 570                     }
 571                 }
 572
 573                 /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
 574                  * This doesnt give us any good oportunity to perform word endian conversion
 575                  * during decompression. So if its requried (ie, this isnt a LE target, we do
 576                  * a second pass over the line here, swapping the bytes.
 577                  */
 578                 pixel = 0xFF00;
 579                 if (0xFF00 != LE_16(&pixel)) /* Check if its not an LE Target */
 580                 {
 581                   pixel_ptr = y_ptr;
 582                   pixel_countdown = s->avctx->width;
 583                   while (pixel_countdown > 0) {
 584                     *((signed short*)(&pixels[pixel_ptr])) = LE_16(&buf[pixel_ptr]);
 585                     pixel_ptr += 2;
 586                   }
 587                 }
 588                 y_ptr += s->frame.linesize[0];
 589             }
 590             break;
 591
 592         case FLI_DTA_BRUN:
 593             y_ptr = 0;
 594             for (lines = 0; lines < s->avctx->height; lines++) {
 595                 pixel_ptr = y_ptr;
 596                 /* disregard the line packets; instead, iterate through all
 597                  * pixels on a row */
 598                 stream_ptr++;
 599                 pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
 600
 601                 while (pixel_countdown > 0) {
 602                     byte_run = buf[stream_ptr++];
 603                     if (byte_run > 0) {
 604                         pixel    = LE_16(&buf[stream_ptr]);
 605                         stream_ptr += 2;
 606                         CHECK_PIXEL_PTR(byte_run);
 607                         for (j = 0; j < byte_run; j++) {
 608                             *((signed short*)(&pixels[pixel_ptr])) = pixel;
 609                             pixel_ptr += 2;
 610                             pixel_countdown--;
 611                             if (pixel_countdown < 0)
 612                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 613                                        pixel_countdown);
 614                         }
 615                     } else {  /* copy pixels if byte_run < 0 */
 616                         byte_run = -byte_run;
 617                         CHECK_PIXEL_PTR(byte_run);
 618                         for (j = 0; j < byte_run; j++) {
 619                             *((signed short*)(&pixels[pixel_ptr])) = LE_16(&buf[stream_ptr]);
 620                             stream_ptr += 2;
 621                             pixel_ptr  += 2;
 622                             pixel_countdown--;
 623                             if (pixel_countdown < 0)
 624                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 625                                        pixel_countdown);
 626                         }
 627                     }
 628                 }
 629
 630                 y_ptr += s->frame.linesize[0];
 631             }
 632             break;
 633
 634         case FLI_COPY:
 635         case FLI_DTA_COPY:
 636             /* copy the chunk (uncompressed frame) */
 637             if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {
 638                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
 639                        "bigger than image, skipping chunk\n", chunk_size - 6);
 640                 stream_ptr += chunk_size - 6;
 641             } else {
 642
 643                 for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
 644                      y_ptr += s->frame.linesize[0]) {
 645
 646                     pixel_countdown = s->avctx->width;
 647                     pixel_ptr = 0;
 648                     while (pixel_countdown > 0) {
 649                       *((signed short*)(&pixels[y_ptr + pixel_ptr])) = LE_16(&buf[stream_ptr+pixel_ptr]);
 650                       pixel_ptr += 2;
 651                       pixel_countdown--;
 652                     }
 653                     stream_ptr += s->avctx->width*2;
 654                 }
 655             }
 656             break;
 657
 658         case FLI_MINI:
 659             /* some sort of a thumbnail? disregard this chunk... */
 660             stream_ptr += chunk_size - 6;
 661             break;
 662
 663         default:
 664             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
 665             break;
 666         }
 667
 668         frame_size -= chunk_size;
 669         num_chunks--;
 670     }
 671
 672     /* by the end of the chunk, the stream ptr should equal the frame
 673      * size (minus 1, possibly); if it doesn't, issue a warning */
 674     if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
 675         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
 676                "and final chunk ptr = %d\n", buf_size, stream_ptr);
 677
 678
 679     *data_size=sizeof(AVFrame);
 680     *(AVFrame*)data = s->frame;
 681
 682     return buf_size;
 683 }
 684
 685 static int flic_decode_frame_24BPP(AVCodecContext *avctx,
 686                                    void *data, int *data_size,
 687                                    uint8_t *buf, int buf_size)
 688 {
 689   av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
 690   return -1;
 691 }
 692
 693 static int flic_decode_frame(AVCodecContext *avctx,
 694                              void *data, int *data_size,
 695                              uint8_t *buf, int buf_size)
 696 {
 697     if (avctx->pix_fmt == PIX_FMT_PAL8) {
 698       return flic_decode_frame_8BPP(avctx, data, data_size,
 699                                     buf, buf_size);
 700     }
 701     else if ((avctx->pix_fmt == PIX_FMT_RGB555) ||
 702              (avctx->pix_fmt == PIX_FMT_RGB565)) {
 703       return flic_decode_frame_15_16BPP(avctx, data, data_size,
 704                                         buf, buf_size);
 705     }
 706     else if (avctx->pix_fmt == PIX_FMT_BGR24) {
 707       return flic_decode_frame_24BPP(avctx, data, data_size,
 708                                      buf, buf_size);
 709     }
 710
 711     /* Shouldnt get  here, ever as the pix_fmt is processed */
 712     /* in flic_decode_init and the above if should deal with */
 713     /* the finite set of possibilites allowable by here. */
 714     /* but in case we do, just error out. */
 715     av_log(avctx, AV_LOG_ERROR, "Unknown Format of FLC. My Science cant explain how this happened\n");
 716     return -1;
 717 }
 718
 719
 720 static int flic_decode_end(AVCodecContext *avctx)
 721 {
 722     FlicDecodeContext *s = avctx->priv_data;
 723
 724     if (s->frame.data[0])
 725         avctx->release_buffer(avctx, &s->frame);
 726
 727     return 0;
 728 }
 729
 730 AVCodec flic_decoder = {
 731     "flic",
 732     CODEC_TYPE_VIDEO,
 733     CODEC_ID_FLIC,
 734     sizeof(FlicDecodeContext),
 735     flic_decode_init,
 736     NULL,
 737     flic_decode_end,
 738     flic_decode_frame,
 739     CODEC_CAP_DR1,
 740     NULL,
 741     NULL,
 742     NULL,
 743     NULL
 744 };