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 Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * Autodesk Animator FLI/FLC Video Decoder
  25  * by Mike Melanson (melanson@pcisys.net)
  26  * for more information on the .fli/.flc file format and all of its many
  27  * variations, visit:
  28  *   http://www.compuphase.com/flic.htm
  29  *
  30  * This decoder outputs PAL8/RGB555/RGB565 and maybe one day RGB24
  31  * colorspace data, depending on the FLC. To use this decoder, be
  32  * sure that your demuxer sends the FLI file header to the decoder via
  33  * the extradata chunk in AVCodecContext. The chunk should be 128 bytes
  34  * large. The only exception is for FLI files from the game "Magic Carpet",
  35  * in which the header is only 12 bytes.
  36  */
  37
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41
  42 #include "libavutil/intreadwrite.h"
  43 #include "avcodec.h"
  44
  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     if (avctx->extradata_size != 12 &&
  85         avctx->extradata_size != 128) {
  86         av_log(avctx, AV_LOG_ERROR, "Expected extradata of 12 or 128 bytes\n");
  87         return AVERROR_INVALIDDATA;
  88     }
  89
  90     s->avctx = avctx;
  91
  92     s->fli_type = AV_RL16(&fli_header[4]); /* Might be overridden if a Magic Carpet FLC */
  93
  94     depth = 0;
  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         depth = 8;
  99     } else {
 100         depth = AV_RL16(&fli_header[12]);
 101     }
 102
 103     if (depth == 0) {
 104         depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
 105     }
 106
 107     if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
 108         depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
 109     }
 110
 111     switch (depth) {
 112         case 8  : avctx->pix_fmt = PIX_FMT_PAL8; break;
 113         case 15 : avctx->pix_fmt = PIX_FMT_RGB555; break;
 114         case 16 : avctx->pix_fmt = PIX_FMT_RGB565; break;
 115         case 24 : avctx->pix_fmt = PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */
 116                   av_log(avctx, AV_LOG_ERROR, "24Bpp FLC/FLX is unsupported due to no test files.\n");
 117                   return -1;
 118         default :
 119                   av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
 120                   return -1;
 121     }
 122
 123     s->frame.data[0] = NULL;
 124     s->new_palette = 0;
 125
 126     return 0;
 127 }
 128
 129 static int flic_decode_frame_8BPP(AVCodecContext *avctx,
 130                                   void *data, int *data_size,
 131                                   const uint8_t *buf, int buf_size)
 132 {
 133     FlicDecodeContext *s = avctx->priv_data;
 134
 135     int stream_ptr = 0;
 136     int stream_ptr_after_color_chunk;
 137     int pixel_ptr;
 138     int palette_ptr;
 139     unsigned char palette_idx1;
 140     unsigned char palette_idx2;
 141
 142     unsigned int frame_size;
 143     int num_chunks;
 144
 145     unsigned int chunk_size;
 146     int chunk_type;
 147
 148     int i, j;
 149
 150     int color_packets;
 151     int color_changes;
 152     int color_shift;
 153     unsigned char r, g, b;
 154
 155     int lines;
 156     int compressed_lines;
 157     int starting_line;
 158     signed short line_packets;
 159     int y_ptr;
 160     int byte_run;
 161     int pixel_skip;
 162     int pixel_countdown;
 163     unsigned char *pixels;
 164     unsigned int pixel_limit;
 165
 166     s->frame.reference = 1;
 167     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 168     if (avctx->reget_buffer(avctx, &s->frame) < 0) {
 169         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 170         return -1;
 171     }
 172
 173     pixels = s->frame.data[0];
 174     pixel_limit = s->avctx->height * s->frame.linesize[0];
 175
 176     frame_size = AV_RL32(&buf[stream_ptr]);
 177     stream_ptr += 6;  /* skip the magic number */
 178     num_chunks = AV_RL16(&buf[stream_ptr]);
 179     stream_ptr += 10;  /* skip padding */
 180
 181     frame_size -= 16;
 182
 183     /* iterate through the chunks */
 184     while ((frame_size > 0) && (num_chunks > 0)) {
 185         chunk_size = AV_RL32(&buf[stream_ptr]);
 186         stream_ptr += 4;
 187         chunk_type = AV_RL16(&buf[stream_ptr]);
 188         stream_ptr += 2;
 189
 190         switch (chunk_type) {
 191         case FLI_256_COLOR:
 192         case FLI_COLOR:
 193             stream_ptr_after_color_chunk = stream_ptr + chunk_size - 6;
 194
 195             /* check special case: If this file is from the Magic Carpet
 196              * game and uses 6-bit colors even though it reports 256-color
 197              * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
 198              * initialization) */
 199             if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
 200                 color_shift = 0;
 201             else
 202                 color_shift = 2;
 203             /* set up the palette */
 204             color_packets = AV_RL16(&buf[stream_ptr]);
 205             stream_ptr += 2;
 206             palette_ptr = 0;
 207             for (i = 0; i < color_packets; i++) {
 208                 /* first byte is how many colors to skip */
 209                 palette_ptr += buf[stream_ptr++];
 210
 211                 /* next byte indicates how many entries to change */
 212                 color_changes = buf[stream_ptr++];
 213
 214                 /* if there are 0 color changes, there are actually 256 */
 215                 if (color_changes == 0)
 216                     color_changes = 256;
 217
 218                 for (j = 0; j < color_changes; j++) {
 219                     unsigned int entry;
 220
 221                     /* wrap around, for good measure */
 222                     if ((unsigned)palette_ptr >= 256)
 223                         palette_ptr = 0;
 224
 225                     r = buf[stream_ptr++] << color_shift;
 226                     g = buf[stream_ptr++] << color_shift;
 227                     b = buf[stream_ptr++] << color_shift;
 228                     entry = (r << 16) | (g << 8) | b;
 229                     if (s->palette[palette_ptr] != entry)
 230                         s->new_palette = 1;
 231                     s->palette[palette_ptr++] = entry;
 232                 }
 233             }
 234
 235             /* color chunks sometimes have weird 16-bit alignment issues;
 236              * therefore, take the hardline approach and set the stream_ptr
 237              * to the value calculated w.r.t. the size specified by the color
 238              * chunk header */
 239             stream_ptr = stream_ptr_after_color_chunk;
 240
 241             break;
 242
 243         case FLI_DELTA:
 244             y_ptr = 0;
 245             compressed_lines = AV_RL16(&buf[stream_ptr]);
 246             stream_ptr += 2;
 247             while (compressed_lines > 0) {
 248                 line_packets = AV_RL16(&buf[stream_ptr]);
 249                 stream_ptr += 2;
 250                 if ((line_packets & 0xC000) == 0xC000) {
 251                     // line skip opcode
 252                     line_packets = -line_packets;
 253                     y_ptr += line_packets * s->frame.linesize[0];
 254                 } else if ((line_packets & 0xC000) == 0x4000) {
 255                     av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);
 256                 } else if ((line_packets & 0xC000) == 0x8000) {
 257                     // "last byte" opcode
 258                     pixel_ptr= y_ptr + s->frame.linesize[0] - 1;
 259                     CHECK_PIXEL_PTR(0);
 260                     pixels[pixel_ptr] = line_packets & 0xff;
 261                 } else {
 262                     compressed_lines--;
 263                     pixel_ptr = y_ptr;
 264                     CHECK_PIXEL_PTR(0);
 265                     pixel_countdown = s->avctx->width;
 266                     for (i = 0; i < line_packets; i++) {
 267                         /* account for the skip bytes */
 268                         pixel_skip = buf[stream_ptr++];
 269                         pixel_ptr += pixel_skip;
 270                         pixel_countdown -= pixel_skip;
 271                         byte_run = (signed char)(buf[stream_ptr++]);
 272                         if (byte_run < 0) {
 273                             byte_run = -byte_run;
 274                             palette_idx1 = buf[stream_ptr++];
 275                             palette_idx2 = buf[stream_ptr++];
 276                             CHECK_PIXEL_PTR(byte_run * 2);
 277                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
 278                                 pixels[pixel_ptr++] = palette_idx1;
 279                                 pixels[pixel_ptr++] = palette_idx2;
 280                             }
 281                         } else {
 282                             CHECK_PIXEL_PTR(byte_run * 2);
 283                             for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
 284                                 palette_idx1 = buf[stream_ptr++];
 285                                 pixels[pixel_ptr++] = palette_idx1;
 286                             }
 287                         }
 288                     }
 289
 290                     y_ptr += s->frame.linesize[0];
 291                 }
 292             }
 293             break;
 294
 295         case FLI_LC:
 296             /* line compressed */
 297             starting_line = AV_RL16(&buf[stream_ptr]);
 298             stream_ptr += 2;
 299             y_ptr = 0;
 300             y_ptr += starting_line * s->frame.linesize[0];
 301
 302             compressed_lines = AV_RL16(&buf[stream_ptr]);
 303             stream_ptr += 2;
 304             while (compressed_lines > 0) {
 305                 pixel_ptr = y_ptr;
 306                 CHECK_PIXEL_PTR(0);
 307                 pixel_countdown = s->avctx->width;
 308                 line_packets = buf[stream_ptr++];
 309                 if (line_packets > 0) {
 310                     for (i = 0; i < line_packets; i++) {
 311                         /* account for the skip bytes */
 312                         pixel_skip = buf[stream_ptr++];
 313                         pixel_ptr += pixel_skip;
 314                         pixel_countdown -= pixel_skip;
 315                         byte_run = (signed char)(buf[stream_ptr++]);
 316                         if (byte_run > 0) {
 317                             CHECK_PIXEL_PTR(byte_run);
 318                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 319                                 palette_idx1 = buf[stream_ptr++];
 320                                 pixels[pixel_ptr++] = palette_idx1;
 321                             }
 322                         } else if (byte_run < 0) {
 323                             byte_run = -byte_run;
 324                             palette_idx1 = buf[stream_ptr++];
 325                             CHECK_PIXEL_PTR(byte_run);
 326                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 327                                 pixels[pixel_ptr++] = palette_idx1;
 328                             }
 329                         }
 330                     }
 331                 }
 332
 333                 y_ptr += s->frame.linesize[0];
 334                 compressed_lines--;
 335             }
 336             break;
 337
 338         case FLI_BLACK:
 339             /* set the whole frame to color 0 (which is usually black) */
 340             memset(pixels, 0,
 341                 s->frame.linesize[0] * s->avctx->height);
 342             break;
 343
 344         case FLI_BRUN:
 345             /* Byte run compression: This chunk type only occurs in the first
 346              * FLI frame and it will update the entire frame. */
 347             y_ptr = 0;
 348             for (lines = 0; lines < s->avctx->height; lines++) {
 349                 pixel_ptr = y_ptr;
 350                 /* disregard the line packets; instead, iterate through all
 351                  * pixels on a row */
 352                 stream_ptr++;
 353                 pixel_countdown = s->avctx->width;
 354                 while (pixel_countdown > 0) {
 355                     byte_run = (signed char)(buf[stream_ptr++]);
 356                     if (byte_run > 0) {
 357                         palette_idx1 = buf[stream_ptr++];
 358                         CHECK_PIXEL_PTR(byte_run);
 359                         for (j = 0; j < byte_run; j++) {
 360                             pixels[pixel_ptr++] = palette_idx1;
 361                             pixel_countdown--;
 362                             if (pixel_countdown < 0)
 363                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 364                                        pixel_countdown, lines);
 365                         }
 366                     } else {  /* copy bytes if byte_run < 0 */
 367                         byte_run = -byte_run;
 368                         CHECK_PIXEL_PTR(byte_run);
 369                         for (j = 0; j < byte_run; j++) {
 370                             palette_idx1 = buf[stream_ptr++];
 371                             pixels[pixel_ptr++] = palette_idx1;
 372                             pixel_countdown--;
 373                             if (pixel_countdown < 0)
 374                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 375                                        pixel_countdown, lines);
 376                         }
 377                     }
 378                 }
 379
 380                 y_ptr += s->frame.linesize[0];
 381             }
 382             break;
 383
 384         case FLI_COPY:
 385             /* copy the chunk (uncompressed frame) */
 386             if (chunk_size - 6 > s->avctx->width * s->avctx->height) {
 387                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
 388                        "bigger than image, skipping chunk\n", chunk_size - 6);
 389                 stream_ptr += chunk_size - 6;
 390             } else {
 391                 for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
 392                      y_ptr += s->frame.linesize[0]) {
 393                     memcpy(&pixels[y_ptr], &buf[stream_ptr],
 394                         s->avctx->width);
 395                     stream_ptr += s->avctx->width;
 396                 }
 397             }
 398             break;
 399
 400         case FLI_MINI:
 401             /* some sort of a thumbnail? disregard this chunk... */
 402             stream_ptr += chunk_size - 6;
 403             break;
 404
 405         default:
 406             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
 407             break;
 408         }
 409
 410         frame_size -= chunk_size;
 411         num_chunks--;
 412     }
 413
 414     /* by the end of the chunk, the stream ptr should equal the frame
 415      * size (minus 1, possibly); if it doesn't, issue a warning */
 416     if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
 417         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
 418                "and final chunk ptr = %d\n", buf_size, stream_ptr);
 419
 420     /* make the palette available on the way out */
 421     memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
 422     if (s->new_palette) {
 423         s->frame.palette_has_changed = 1;
 424         s->new_palette = 0;
 425     }
 426
 427     *data_size=sizeof(AVFrame);
 428     *(AVFrame*)data = s->frame;
 429
 430     return buf_size;
 431 }
 432
 433 static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
 434                                       void *data, int *data_size,
 435                                       const uint8_t *buf, int buf_size)
 436 {
 437     /* Note, the only difference between the 15Bpp and 16Bpp */
 438     /* Format is the pixel format, the packets are processed the same. */
 439     FlicDecodeContext *s = avctx->priv_data;
 440
 441     int stream_ptr = 0;
 442     int pixel_ptr;
 443     unsigned char palette_idx1;
 444
 445     unsigned int frame_size;
 446     int num_chunks;
 447
 448     unsigned int chunk_size;
 449     int chunk_type;
 450
 451     int i, j;
 452
 453     int lines;
 454     int compressed_lines;
 455     signed short line_packets;
 456     int y_ptr;
 457     int byte_run;
 458     int pixel_skip;
 459     int pixel_countdown;
 460     unsigned char *pixels;
 461     int pixel;
 462     unsigned int pixel_limit;
 463
 464     s->frame.reference = 1;
 465     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 466     if (avctx->reget_buffer(avctx, &s->frame) < 0) {
 467         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 468         return -1;
 469     }
 470
 471     pixels = s->frame.data[0];
 472     pixel_limit = s->avctx->height * s->frame.linesize[0];
 473
 474     frame_size = AV_RL32(&buf[stream_ptr]);
 475     stream_ptr += 6;  /* skip the magic number */
 476     num_chunks = AV_RL16(&buf[stream_ptr]);
 477     stream_ptr += 10;  /* skip padding */
 478
 479     frame_size -= 16;
 480
 481     /* iterate through the chunks */
 482     while ((frame_size > 0) && (num_chunks > 0)) {
 483         chunk_size = AV_RL32(&buf[stream_ptr]);
 484         stream_ptr += 4;
 485         chunk_type = AV_RL16(&buf[stream_ptr]);
 486         stream_ptr += 2;
 487
 488         switch (chunk_type) {
 489         case FLI_256_COLOR:
 490         case FLI_COLOR:
 491             /* For some reason, it seems that non-palettized flics do
 492              * include one of these chunks in their first frame.
 493              * Why I do not know, it seems rather extraneous. */
 494 /*            av_log(avctx, AV_LOG_ERROR, "Unexpected Palette chunk %d in non-paletised FLC\n",chunk_type);*/
 495             stream_ptr = stream_ptr + chunk_size - 6;
 496             break;
 497
 498         case FLI_DELTA:
 499         case FLI_DTA_LC:
 500             y_ptr = 0;
 501             compressed_lines = AV_RL16(&buf[stream_ptr]);
 502             stream_ptr += 2;
 503             while (compressed_lines > 0) {
 504                 line_packets = AV_RL16(&buf[stream_ptr]);
 505                 stream_ptr += 2;
 506                 if (line_packets < 0) {
 507                     line_packets = -line_packets;
 508                     y_ptr += line_packets * s->frame.linesize[0];
 509                 } else {
 510                     compressed_lines--;
 511                     pixel_ptr = y_ptr;
 512                     CHECK_PIXEL_PTR(0);
 513                     pixel_countdown = s->avctx->width;
 514                     for (i = 0; i < line_packets; i++) {
 515                         /* account for the skip bytes */
 516                         pixel_skip = buf[stream_ptr++];
 517                         pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
 518                         pixel_countdown -= pixel_skip;
 519                         byte_run = (signed char)(buf[stream_ptr++]);
 520                         if (byte_run < 0) {
 521                             byte_run = -byte_run;
 522                             pixel    = AV_RL16(&buf[stream_ptr]);
 523                             stream_ptr += 2;
 524                             CHECK_PIXEL_PTR(2 * byte_run);
 525                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
 526                                 *((signed short*)(&pixels[pixel_ptr])) = pixel;
 527                                 pixel_ptr += 2;
 528                             }
 529                         } else {
 530                             CHECK_PIXEL_PTR(2 * byte_run);
 531                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 532                                 *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[stream_ptr]);
 533                                 stream_ptr += 2;
 534                                 pixel_ptr += 2;
 535                             }
 536                         }
 537                     }
 538
 539                     y_ptr += s->frame.linesize[0];
 540                 }
 541             }
 542             break;
 543
 544         case FLI_LC:
 545             av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-paletised FLC\n");
 546             stream_ptr = stream_ptr + chunk_size - 6;
 547             break;
 548
 549         case FLI_BLACK:
 550             /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */
 551             memset(pixels, 0x0000,
 552                    s->frame.linesize[0] * s->avctx->height);
 553             break;
 554
 555         case FLI_BRUN:
 556             y_ptr = 0;
 557             for (lines = 0; lines < s->avctx->height; lines++) {
 558                 pixel_ptr = y_ptr;
 559                 /* disregard the line packets; instead, iterate through all
 560                  * pixels on a row */
 561                 stream_ptr++;
 562                 pixel_countdown = (s->avctx->width * 2);
 563
 564                 while (pixel_countdown > 0) {
 565                     byte_run = (signed char)(buf[stream_ptr++]);
 566                     if (byte_run > 0) {
 567                         palette_idx1 = buf[stream_ptr++];
 568                         CHECK_PIXEL_PTR(byte_run);
 569                         for (j = 0; j < byte_run; j++) {
 570                             pixels[pixel_ptr++] = palette_idx1;
 571                             pixel_countdown--;
 572                             if (pixel_countdown < 0)
 573                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
 574                                        pixel_countdown, lines);
 575                         }
 576                     } else {  /* copy bytes if byte_run < 0 */
 577                         byte_run = -byte_run;
 578                         CHECK_PIXEL_PTR(byte_run);
 579                         for (j = 0; j < byte_run; j++) {
 580                             palette_idx1 = buf[stream_ptr++];
 581                             pixels[pixel_ptr++] = palette_idx1;
 582                             pixel_countdown--;
 583                             if (pixel_countdown < 0)
 584                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 585                                        pixel_countdown, lines);
 586                         }
 587                     }
 588                 }
 589
 590                 /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
 591                  * This does not give us any good oportunity to perform word endian conversion
 592                  * during decompression. So if it is required (i.e., this is not a LE target, we do
 593                  * a second pass over the line here, swapping the bytes.
 594                  */
 595 #if HAVE_BIGENDIAN
 596                 pixel_ptr = y_ptr;
 597                 pixel_countdown = s->avctx->width;
 598                 while (pixel_countdown > 0) {
 599                     *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]);
 600                     pixel_ptr += 2;
 601                 }
 602 #endif
 603                 y_ptr += s->frame.linesize[0];
 604             }
 605             break;
 606
 607         case FLI_DTA_BRUN:
 608             y_ptr = 0;
 609             for (lines = 0; lines < s->avctx->height; lines++) {
 610                 pixel_ptr = y_ptr;
 611                 /* disregard the line packets; instead, iterate through all
 612                  * pixels on a row */
 613                 stream_ptr++;
 614                 pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
 615
 616                 while (pixel_countdown > 0) {
 617                     byte_run = (signed char)(buf[stream_ptr++]);
 618                     if (byte_run > 0) {
 619                         pixel    = AV_RL16(&buf[stream_ptr]);
 620                         stream_ptr += 2;
 621                         CHECK_PIXEL_PTR(2 * byte_run);
 622                         for (j = 0; j < byte_run; j++) {
 623                             *((signed short*)(&pixels[pixel_ptr])) = pixel;
 624                             pixel_ptr += 2;
 625                             pixel_countdown--;
 626                             if (pixel_countdown < 0)
 627                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 628                                        pixel_countdown);
 629                         }
 630                     } else {  /* copy pixels if byte_run < 0 */
 631                         byte_run = -byte_run;
 632                         CHECK_PIXEL_PTR(2 * byte_run);
 633                         for (j = 0; j < byte_run; j++) {
 634                             *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[stream_ptr]);
 635                             stream_ptr += 2;
 636                             pixel_ptr  += 2;
 637                             pixel_countdown--;
 638                             if (pixel_countdown < 0)
 639                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 640                                        pixel_countdown);
 641                         }
 642                     }
 643                 }
 644
 645                 y_ptr += s->frame.linesize[0];
 646             }
 647             break;
 648
 649         case FLI_COPY:
 650         case FLI_DTA_COPY:
 651             /* copy the chunk (uncompressed frame) */
 652             if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {
 653                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
 654                        "bigger than image, skipping chunk\n", chunk_size - 6);
 655                 stream_ptr += chunk_size - 6;
 656             } else {
 657
 658                 for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
 659                      y_ptr += s->frame.linesize[0]) {
 660
 661                     pixel_countdown = s->avctx->width;
 662                     pixel_ptr = 0;
 663                     while (pixel_countdown > 0) {
 664                       *((signed short*)(&pixels[y_ptr + pixel_ptr])) = AV_RL16(&buf[stream_ptr+pixel_ptr]);
 665                       pixel_ptr += 2;
 666                       pixel_countdown--;
 667                     }
 668                     stream_ptr += s->avctx->width*2;
 669                 }
 670             }
 671             break;
 672
 673         case FLI_MINI:
 674             /* some sort of a thumbnail? disregard this chunk... */
 675             stream_ptr += chunk_size - 6;
 676             break;
 677
 678         default:
 679             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
 680             break;
 681         }
 682
 683         frame_size -= chunk_size;
 684         num_chunks--;
 685     }
 686
 687     /* by the end of the chunk, the stream ptr should equal the frame
 688      * size (minus 1, possibly); if it doesn't, issue a warning */
 689     if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
 690         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
 691                "and final chunk ptr = %d\n", buf_size, stream_ptr);
 692
 693
 694     *data_size=sizeof(AVFrame);
 695     *(AVFrame*)data = s->frame;
 696
 697     return buf_size;
 698 }
 699
 700 static int flic_decode_frame_24BPP(AVCodecContext *avctx,
 701                                    void *data, int *data_size,
 702                                    const uint8_t *buf, int buf_size)
 703 {
 704   av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
 705   return -1;
 706 }
 707
 708 static int flic_decode_frame(AVCodecContext *avctx,
 709                              void *data, int *data_size,
 710                              AVPacket *avpkt)
 711 {
 712     const uint8_t *buf = avpkt->data;
 713     int buf_size = avpkt->size;
 714     if (avctx->pix_fmt == PIX_FMT_PAL8) {
 715       return flic_decode_frame_8BPP(avctx, data, data_size,
 716                                     buf, buf_size);
 717     }
 718     else if ((avctx->pix_fmt == PIX_FMT_RGB555) ||
 719              (avctx->pix_fmt == PIX_FMT_RGB565)) {
 720       return flic_decode_frame_15_16BPP(avctx, data, data_size,
 721                                         buf, buf_size);
 722     }
 723     else if (avctx->pix_fmt == PIX_FMT_BGR24) {
 724       return flic_decode_frame_24BPP(avctx, data, data_size,
 725                                      buf, buf_size);
 726     }
 727
 728     /* Should not get  here, ever as the pix_fmt is processed */
 729     /* in flic_decode_init and the above if should deal with */
 730     /* the finite set of possibilites allowable by here. */
 731     /* But in case we do, just error out. */
 732     av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");
 733     return -1;
 734 }
 735
 736
 737 static av_cold int flic_decode_end(AVCodecContext *avctx)
 738 {
 739     FlicDecodeContext *s = avctx->priv_data;
 740
 741     if (s->frame.data[0])
 742         avctx->release_buffer(avctx, &s->frame);
 743
 744     return 0;
 745 }
 746
 747 AVCodec ff_flic_decoder = {
 748     .name           = "flic",
 749     .type           = AVMEDIA_TYPE_VIDEO,
 750     .id             = CODEC_ID_FLIC,
 751     .priv_data_size = sizeof(FlicDecodeContext),
 752     .init           = flic_decode_init,
 753     .close          = flic_decode_end,
 754     .decode         = flic_decode_frame,
 755     .capabilities   = CODEC_CAP_DR1,
 756     .long_name = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"),
 757 };