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 #include "bytestream.h"
  45 #include "mathops.h"
  46
  47 #define FLI_256_COLOR 4
  48 #define FLI_DELTA     7
  49 #define FLI_COLOR     11
  50 #define FLI_LC        12
  51 #define FLI_BLACK     13
  52 #define FLI_BRUN      15
  53 #define FLI_COPY      16
  54 #define FLI_MINI      18
  55 #define FLI_DTA_BRUN  25
  56 #define FLI_DTA_COPY  26
  57 #define FLI_DTA_LC    27
  58
  59 #define FLI_TYPE_CODE     (0xAF11)
  60 #define FLC_FLX_TYPE_CODE (0xAF12)
  61 #define FLC_DTA_TYPE_CODE (0xAF44) /* Marks an "Extended FLC" comes from Dave's Targa Animator (DTA) */
  62 #define FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE (0xAF13)
  63
  64 #define CHECK_PIXEL_PTR(n) \
  65     if (pixel_ptr + n > pixel_limit) { \
  66         av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr >= pixel_limit (%d >= %d)\n", \
  67         pixel_ptr + n, pixel_limit); \
  68         return -1; \
  69     } \
  70
  71 typedef struct FlicDecodeContext {
  72     AVCodecContext *avctx;
  73     AVFrame frame;
  74
  75     unsigned int palette[256];
  76     int new_palette;
  77     int fli_type;  /* either 0xAF11 or 0xAF12, affects palette resolution */
  78 } FlicDecodeContext;
  79
  80 static av_cold int flic_decode_init(AVCodecContext *avctx)
  81 {
  82     FlicDecodeContext *s = avctx->priv_data;
  83     unsigned char *fli_header = (unsigned char *)avctx->extradata;
  84     int depth;
  85
  86     if (avctx->extradata_size != 12 &&
  87         avctx->extradata_size != 128) {
  88         av_log(avctx, AV_LOG_ERROR, "Expected extradata of 12 or 128 bytes\n");
  89         return AVERROR_INVALIDDATA;
  90     }
  91
  92     s->avctx = avctx;
  93
  94     s->fli_type = AV_RL16(&fli_header[4]); /* Might be overridden if a Magic Carpet FLC */
  95
  96     depth = 0;
  97     if (s->avctx->extradata_size == 12) {
  98         /* special case for magic carpet FLIs */
  99         s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE;
 100         depth = 8;
 101     } else {
 102         depth = AV_RL16(&fli_header[12]);
 103     }
 104
 105     if (depth == 0) {
 106         depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
 107     }
 108
 109     if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
 110         depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
 111     }
 112
 113     switch (depth) {
 114         case 8  : avctx->pix_fmt = PIX_FMT_PAL8; break;
 115         case 15 : avctx->pix_fmt = PIX_FMT_RGB555; break;
 116         case 16 : avctx->pix_fmt = PIX_FMT_RGB565; break;
 117         case 24 : avctx->pix_fmt = PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */
 118                   av_log(avctx, AV_LOG_ERROR, "24Bpp FLC/FLX is unsupported due to no test files.\n");
 119                   return -1;
 120         default :
 121                   av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
 122                   return -1;
 123     }
 124
 125     s->frame.data[0] = NULL;
 126     s->new_palette = 0;
 127
 128     return 0;
 129 }
 130
 131 static int flic_decode_frame_8BPP(AVCodecContext *avctx,
 132                                   void *data, int *data_size,
 133                                   const uint8_t *buf, int buf_size)
 134 {
 135     FlicDecodeContext *s = avctx->priv_data;
 136
 137     GetByteContext g2;
 138     int stream_ptr_after_color_chunk;
 139     int pixel_ptr;
 140     int palette_ptr;
 141     unsigned char palette_idx1;
 142     unsigned char palette_idx2;
 143
 144     unsigned int frame_size;
 145     int num_chunks;
 146
 147     unsigned int chunk_size;
 148     int chunk_type;
 149
 150     int i, j;
 151
 152     int color_packets;
 153     int color_changes;
 154     int color_shift;
 155     unsigned char r, g, b;
 156
 157     int lines;
 158     int compressed_lines;
 159     int starting_line;
 160     signed short line_packets;
 161     int y_ptr;
 162     int byte_run;
 163     int pixel_skip;
 164     int pixel_countdown;
 165     unsigned char *pixels;
 166     unsigned int pixel_limit;
 167
 168     bytestream2_init(&g2, buf, buf_size);
 169
 170     s->frame.reference = 1;
 171     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 172     if (avctx->reget_buffer(avctx, &s->frame) < 0) {
 173         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 174         return -1;
 175     }
 176
 177     pixels = s->frame.data[0];
 178     pixel_limit = s->avctx->height * s->frame.linesize[0];
 179     frame_size = bytestream2_get_le32(&g2);
 180     bytestream2_skip(&g2, 2); /* skip the magic number */
 181     num_chunks = bytestream2_get_le16(&g2);
 182     bytestream2_skip(&g2, 8);  /* skip padding */
 183
 184     frame_size -= 16;
 185
 186     /* iterate through the chunks */
 187     while ((frame_size > 0) && (num_chunks > 0)) {
 188         chunk_size = bytestream2_get_le32(&g2);
 189         chunk_type = bytestream2_get_le16(&g2);
 190
 191         switch (chunk_type) {
 192         case FLI_256_COLOR:
 193         case FLI_COLOR:
 194             stream_ptr_after_color_chunk = bytestream2_tell(&g2) + chunk_size - 6;
 195
 196             /* check special case: If this file is from the Magic Carpet
 197              * game and uses 6-bit colors even though it reports 256-color
 198              * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
 199              * initialization) */
 200             if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
 201                 color_shift = 0;
 202             else
 203                 color_shift = 2;
 204             /* set up the palette */
 205             color_packets = bytestream2_get_le16(&g2);
 206             palette_ptr = 0;
 207             for (i = 0; i < color_packets; i++) {
 208                 /* first byte is how many colors to skip */
 209                 palette_ptr += bytestream2_get_byte(&g2);
 210
 211                 /* next byte indicates how many entries to change */
 212                 color_changes = bytestream2_get_byte(&g2);
 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 = bytestream2_get_byte(&g2) << color_shift;
 226                     g = bytestream2_get_byte(&g2) << color_shift;
 227                     b = bytestream2_get_byte(&g2) << 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 skip
 237              * to the value calculated w.r.t. the size specified by the color
 238              * chunk header */
 239             if (stream_ptr_after_color_chunk - bytestream2_tell(&g2) > 0)
 240                 bytestream2_skip(&g2, stream_ptr_after_color_chunk - bytestream2_tell(&g2));
 241
 242             break;
 243
 244         case FLI_DELTA:
 245             y_ptr = 0;
 246             compressed_lines = bytestream2_get_le16(&g2);
 247             while (compressed_lines > 0) {
 248                 line_packets = bytestream2_get_le16(&g2);
 249                 if ((line_packets & 0xC000) == 0xC000) {
 250                     // line skip opcode
 251                     line_packets = -line_packets;
 252                     y_ptr += line_packets * s->frame.linesize[0];
 253                 } else if ((line_packets & 0xC000) == 0x4000) {
 254                     av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);
 255                 } else if ((line_packets & 0xC000) == 0x8000) {
 256                     // "last byte" opcode
 257                     pixel_ptr= y_ptr + s->frame.linesize[0] - 1;
 258                     CHECK_PIXEL_PTR(0);
 259                     pixels[pixel_ptr] = line_packets & 0xff;
 260                 } else {
 261                     compressed_lines--;
 262                     pixel_ptr = y_ptr;
 263                     CHECK_PIXEL_PTR(0);
 264                     pixel_countdown = s->avctx->width;
 265                     for (i = 0; i < line_packets; i++) {
 266                         /* account for the skip bytes */
 267                         pixel_skip = bytestream2_get_byte(&g2);
 268                         pixel_ptr += pixel_skip;
 269                         pixel_countdown -= pixel_skip;
 270                         byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 271                         if (byte_run < 0) {
 272                             byte_run = -byte_run;
 273                             palette_idx1 = bytestream2_get_byte(&g2);
 274                             palette_idx2 = bytestream2_get_byte(&g2);
 275                             CHECK_PIXEL_PTR(byte_run * 2);
 276                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
 277                                 pixels[pixel_ptr++] = palette_idx1;
 278                                 pixels[pixel_ptr++] = palette_idx2;
 279                             }
 280                         } else {
 281                             CHECK_PIXEL_PTR(byte_run * 2);
 282                             for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
 283                                 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
 284                             }
 285                         }
 286                     }
 287
 288                     y_ptr += s->frame.linesize[0];
 289                 }
 290             }
 291             break;
 292
 293         case FLI_LC:
 294             /* line compressed */
 295             starting_line = bytestream2_get_le16(&g2);
 296             y_ptr = 0;
 297             y_ptr += starting_line * s->frame.linesize[0];
 298
 299             compressed_lines = bytestream2_get_le16(&g2);
 300             while (compressed_lines > 0) {
 301                 pixel_ptr = y_ptr;
 302                 CHECK_PIXEL_PTR(0);
 303                 pixel_countdown = s->avctx->width;
 304                 line_packets = bytestream2_get_byte(&g2);
 305                 if (line_packets > 0) {
 306                     for (i = 0; i < line_packets; i++) {
 307                         /* account for the skip bytes */
 308                         pixel_skip = bytestream2_get_byte(&g2);
 309                         pixel_ptr += pixel_skip;
 310                         pixel_countdown -= pixel_skip;
 311                         byte_run = sign_extend(bytestream2_get_byte(&g2),8);
 312                         if (byte_run > 0) {
 313                             CHECK_PIXEL_PTR(byte_run);
 314                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 315                                 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
 316                             }
 317                         } else if (byte_run < 0) {
 318                             byte_run = -byte_run;
 319                             palette_idx1 = bytestream2_get_byte(&g2);
 320                             CHECK_PIXEL_PTR(byte_run);
 321                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 322                                 pixels[pixel_ptr++] = palette_idx1;
 323                             }
 324                         }
 325                     }
 326                 }
 327
 328                 y_ptr += s->frame.linesize[0];
 329                 compressed_lines--;
 330             }
 331             break;
 332
 333         case FLI_BLACK:
 334             /* set the whole frame to color 0 (which is usually black) */
 335             memset(pixels, 0,
 336                 s->frame.linesize[0] * s->avctx->height);
 337             break;
 338
 339         case FLI_BRUN:
 340             /* Byte run compression: This chunk type only occurs in the first
 341              * FLI frame and it will update the entire frame. */
 342             y_ptr = 0;
 343             for (lines = 0; lines < s->avctx->height; lines++) {
 344                 pixel_ptr = y_ptr;
 345                 /* disregard the line packets; instead, iterate through all
 346                  * pixels on a row */
 347                  bytestream2_skip(&g2, 1);
 348                 pixel_countdown = s->avctx->width;
 349                 while (pixel_countdown > 0) {
 350                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 351                     if (byte_run > 0) {
 352                         palette_idx1 = bytestream2_get_byte(&g2);
 353                         CHECK_PIXEL_PTR(byte_run);
 354                         for (j = 0; j < byte_run; j++) {
 355                             pixels[pixel_ptr++] = palette_idx1;
 356                             pixel_countdown--;
 357                             if (pixel_countdown < 0)
 358                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 359                                        pixel_countdown, lines);
 360                         }
 361                     } else {  /* copy bytes if byte_run < 0 */
 362                         byte_run = -byte_run;
 363                         CHECK_PIXEL_PTR(byte_run);
 364                         for (j = 0; j < byte_run; j++) {
 365                             pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
 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                 bytestream2_skip(&g2, 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                     bytestream2_get_buffer(&g2, &pixels[y_ptr],
 388                                            s->avctx->width);
 389                 }
 390             }
 391             break;
 392
 393         case FLI_MINI:
 394             /* some sort of a thumbnail? disregard this chunk... */
 395             bytestream2_skip(&g2, chunk_size - 6);
 396             break;
 397
 398         default:
 399             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
 400             break;
 401         }
 402
 403         frame_size -= chunk_size;
 404         num_chunks--;
 405     }
 406
 407     /* by the end of the chunk, the stream ptr should equal the frame
 408      * size (minus 1, possibly); if it doesn't, issue a warning */
 409     if ((bytestream2_get_bytes_left(&g2) != 0) &&
 410         (bytestream2_get_bytes_left(&g2) != 1))
 411         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
 412                "and final chunk ptr = %d\n", buf_size,
 413                buf_size - bytestream2_get_bytes_left(&g2));
 414
 415     /* make the palette available on the way out */
 416     memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
 417     if (s->new_palette) {
 418         s->frame.palette_has_changed = 1;
 419         s->new_palette = 0;
 420     }
 421
 422     *data_size=sizeof(AVFrame);
 423     *(AVFrame*)data = s->frame;
 424
 425     return buf_size;
 426 }
 427
 428 static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
 429                                       void *data, int *data_size,
 430                                       const uint8_t *buf, int buf_size)
 431 {
 432     /* Note, the only difference between the 15Bpp and 16Bpp */
 433     /* Format is the pixel format, the packets are processed the same. */
 434     FlicDecodeContext *s = avctx->priv_data;
 435
 436     GetByteContext g2;
 437     int pixel_ptr;
 438     unsigned char palette_idx1;
 439
 440     unsigned int frame_size;
 441     int num_chunks;
 442
 443     unsigned int chunk_size;
 444     int chunk_type;
 445
 446     int i, j;
 447
 448     int lines;
 449     int compressed_lines;
 450     signed short line_packets;
 451     int y_ptr;
 452     int byte_run;
 453     int pixel_skip;
 454     int pixel_countdown;
 455     unsigned char *pixels;
 456     int pixel;
 457     unsigned int pixel_limit;
 458
 459     bytestream2_init(&g2, buf, buf_size);
 460
 461     s->frame.reference = 1;
 462     s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
 463     if (avctx->reget_buffer(avctx, &s->frame) < 0) {
 464         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 465         return -1;
 466     }
 467
 468     pixels = s->frame.data[0];
 469     pixel_limit = s->avctx->height * s->frame.linesize[0];
 470
 471     frame_size = bytestream2_get_le32(&g2);
 472     bytestream2_skip(&g2, 2);  /* skip the magic number */
 473     num_chunks = bytestream2_get_le16(&g2);
 474     bytestream2_skip(&g2, 8);  /* skip padding */
 475
 476     frame_size -= 16;
 477
 478     /* iterate through the chunks */
 479     while ((frame_size > 0) && (num_chunks > 0)) {
 480         chunk_size = bytestream2_get_le32(&g2);
 481         chunk_type = bytestream2_get_le16(&g2);
 482
 483         switch (chunk_type) {
 484         case FLI_256_COLOR:
 485         case FLI_COLOR:
 486             /* For some reason, it seems that non-palettized flics do
 487              * include one of these chunks in their first frame.
 488              * Why I do not know, it seems rather extraneous. */
 489 /*            av_log(avctx, AV_LOG_ERROR, "Unexpected Palette chunk %d in non-paletised FLC\n",chunk_type);*/
 490             bytestream2_skip(&g2, chunk_size - 6);
 491             break;
 492
 493         case FLI_DELTA:
 494         case FLI_DTA_LC:
 495             y_ptr = 0;
 496             compressed_lines = bytestream2_get_le16(&g2);
 497             while (compressed_lines > 0) {
 498                 line_packets = bytestream2_get_le16(&g2);
 499                 if (line_packets < 0) {
 500                     line_packets = -line_packets;
 501                     y_ptr += line_packets * s->frame.linesize[0];
 502                 } else {
 503                     compressed_lines--;
 504                     pixel_ptr = y_ptr;
 505                     CHECK_PIXEL_PTR(0);
 506                     pixel_countdown = s->avctx->width;
 507                     for (i = 0; i < line_packets; i++) {
 508                         /* account for the skip bytes */
 509                         pixel_skip = bytestream2_get_byte(&g2);
 510                         pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
 511                         pixel_countdown -= pixel_skip;
 512                         byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 513                         if (byte_run < 0) {
 514                             byte_run = -byte_run;
 515                             pixel    = bytestream2_get_le16(&g2);
 516                             CHECK_PIXEL_PTR(2 * byte_run);
 517                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
 518                                 *((signed short*)(&pixels[pixel_ptr])) = pixel;
 519                                 pixel_ptr += 2;
 520                             }
 521                         } else {
 522                             CHECK_PIXEL_PTR(2 * byte_run);
 523                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 524                                 *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
 525                                 pixel_ptr += 2;
 526                             }
 527                         }
 528                     }
 529
 530                     y_ptr += s->frame.linesize[0];
 531                 }
 532             }
 533             break;
 534
 535         case FLI_LC:
 536             av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-paletised FLC\n");
 537             bytestream2_skip(&g2, chunk_size - 6);
 538             break;
 539
 540         case FLI_BLACK:
 541             /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */
 542             memset(pixels, 0x0000,
 543                    s->frame.linesize[0] * s->avctx->height);
 544             break;
 545
 546         case FLI_BRUN:
 547             y_ptr = 0;
 548             for (lines = 0; lines < s->avctx->height; lines++) {
 549                 pixel_ptr = y_ptr;
 550                 /* disregard the line packets; instead, iterate through all
 551                  * pixels on a row */
 552                 bytestream2_skip(&g2, 1);
 553                 pixel_countdown = (s->avctx->width * 2);
 554
 555                 while (pixel_countdown > 0) {
 556                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 557                     if (byte_run > 0) {
 558                         palette_idx1 = bytestream2_get_byte(&g2);
 559                         CHECK_PIXEL_PTR(byte_run);
 560                         for (j = 0; j < byte_run; j++) {
 561                             pixels[pixel_ptr++] = palette_idx1;
 562                             pixel_countdown--;
 563                             if (pixel_countdown < 0)
 564                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
 565                                        pixel_countdown, lines);
 566                         }
 567                     } else {  /* copy bytes if byte_run < 0 */
 568                         byte_run = -byte_run;
 569                         CHECK_PIXEL_PTR(byte_run);
 570                         for (j = 0; j < byte_run; j++) {
 571                             palette_idx1 = bytestream2_get_byte(&g2);
 572                             pixels[pixel_ptr++] = palette_idx1;
 573                             pixel_countdown--;
 574                             if (pixel_countdown < 0)
 575                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 576                                        pixel_countdown, lines);
 577                         }
 578                     }
 579                 }
 580
 581                 /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
 582                  * This does not give us any good oportunity to perform word endian conversion
 583                  * during decompression. So if it is required (i.e., this is not a LE target, we do
 584                  * a second pass over the line here, swapping the bytes.
 585                  */
 586 #if HAVE_BIGENDIAN
 587                 pixel_ptr = y_ptr;
 588                 pixel_countdown = s->avctx->width;
 589                 while (pixel_countdown > 0) {
 590                     *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]);
 591                     pixel_ptr += 2;
 592                 }
 593 #endif
 594                 y_ptr += s->frame.linesize[0];
 595             }
 596             break;
 597
 598         case FLI_DTA_BRUN:
 599             y_ptr = 0;
 600             for (lines = 0; lines < s->avctx->height; lines++) {
 601                 pixel_ptr = y_ptr;
 602                 /* disregard the line packets; instead, iterate through all
 603                  * pixels on a row */
 604                 bytestream2_skip(&g2, 1);
 605                 pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
 606
 607                 while (pixel_countdown > 0) {
 608                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 609                     if (byte_run > 0) {
 610                         pixel    = bytestream2_get_le16(&g2);
 611                         CHECK_PIXEL_PTR(2 * byte_run);
 612                         for (j = 0; j < byte_run; j++) {
 613                             *((signed short*)(&pixels[pixel_ptr])) = pixel;
 614                             pixel_ptr += 2;
 615                             pixel_countdown--;
 616                             if (pixel_countdown < 0)
 617                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 618                                        pixel_countdown);
 619                         }
 620                     } else {  /* copy pixels if byte_run < 0 */
 621                         byte_run = -byte_run;
 622                         CHECK_PIXEL_PTR(2 * byte_run);
 623                         for (j = 0; j < byte_run; j++) {
 624                             *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
 625                             pixel_ptr  += 2;
 626                             pixel_countdown--;
 627                             if (pixel_countdown < 0)
 628                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 629                                        pixel_countdown);
 630                         }
 631                     }
 632                 }
 633
 634                 y_ptr += s->frame.linesize[0];
 635             }
 636             break;
 637
 638         case FLI_COPY:
 639         case FLI_DTA_COPY:
 640             /* copy the chunk (uncompressed frame) */
 641             if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {
 642                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
 643                        "bigger than image, skipping chunk\n", chunk_size - 6);
 644                 bytestream2_skip(&g2, chunk_size - 6);
 645             } else {
 646
 647                 for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
 648                      y_ptr += s->frame.linesize[0]) {
 649
 650                     pixel_countdown = s->avctx->width;
 651                     pixel_ptr = 0;
 652                     while (pixel_countdown > 0) {
 653                       *((signed short*)(&pixels[y_ptr + pixel_ptr])) = bytestream2_get_le16(&g2);
 654                       pixel_ptr += 2;
 655                       pixel_countdown--;
 656                     }
 657                 }
 658             }
 659             break;
 660
 661         case FLI_MINI:
 662             /* some sort of a thumbnail? disregard this chunk... */
 663             bytestream2_skip(&g2, chunk_size - 6);
 664             break;
 665
 666         default:
 667             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
 668             break;
 669         }
 670
 671         frame_size -= chunk_size;
 672         num_chunks--;
 673     }
 674
 675     /* by the end of the chunk, the stream ptr should equal the frame
 676      * size (minus 1, possibly); if it doesn't, issue a warning */
 677     if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1))
 678         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
 679                "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2));
 680
 681
 682     *data_size=sizeof(AVFrame);
 683     *(AVFrame*)data = s->frame;
 684
 685     return buf_size;
 686 }
 687
 688 static int flic_decode_frame_24BPP(AVCodecContext *avctx,
 689                                    void *data, int *data_size,
 690                                    const uint8_t *buf, int buf_size)
 691 {
 692   av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
 693   return -1;
 694 }
 695
 696 static int flic_decode_frame(AVCodecContext *avctx,
 697                              void *data, int *data_size,
 698                              AVPacket *avpkt)
 699 {
 700     const uint8_t *buf = avpkt->data;
 701     int buf_size = avpkt->size;
 702     if (avctx->pix_fmt == PIX_FMT_PAL8) {
 703       return flic_decode_frame_8BPP(avctx, data, data_size,
 704                                     buf, buf_size);
 705     }
 706     else if ((avctx->pix_fmt == PIX_FMT_RGB555) ||
 707              (avctx->pix_fmt == PIX_FMT_RGB565)) {
 708       return flic_decode_frame_15_16BPP(avctx, data, data_size,
 709                                         buf, buf_size);
 710     }
 711     else if (avctx->pix_fmt == PIX_FMT_BGR24) {
 712       return flic_decode_frame_24BPP(avctx, data, data_size,
 713                                      buf, buf_size);
 714     }
 715
 716     /* Should not get  here, ever as the pix_fmt is processed */
 717     /* in flic_decode_init and the above if should deal with */
 718     /* the finite set of possibilites allowable by here. */
 719     /* But in case we do, just error out. */
 720     av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");
 721     return -1;
 722 }
 723
 724
 725 static av_cold int flic_decode_end(AVCodecContext *avctx)
 726 {
 727     FlicDecodeContext *s = avctx->priv_data;
 728
 729     if (s->frame.data[0])
 730         avctx->release_buffer(avctx, &s->frame);
 731
 732     return 0;
 733 }
 734
 735 AVCodec ff_flic_decoder = {
 736     .name           = "flic",
 737     .type           = AVMEDIA_TYPE_VIDEO,
 738     .id             = CODEC_ID_FLIC,
 739     .priv_data_size = sizeof(FlicDecodeContext),
 740     .init           = flic_decode_init,
 741     .close          = flic_decode_end,
 742     .decode         = flic_decode_frame,
 743     .capabilities   = CODEC_CAP_DR1,
 744     .long_name = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"),
 745 };