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 "internal.h"
  46 #include "mathops.h"
  47
  48 #define FLI_256_COLOR 4
  49 #define FLI_DELTA     7
  50 #define FLI_COLOR     11
  51 #define FLI_LC        12
  52 #define FLI_BLACK     13
  53 #define FLI_BRUN      15
  54 #define FLI_COPY      16
  55 #define FLI_MINI      18
  56 #define FLI_DTA_BRUN  25
  57 #define FLI_DTA_COPY  26
  58 #define FLI_DTA_LC    27
  59
  60 #define FLI_TYPE_CODE     (0xAF11)
  61 #define FLC_FLX_TYPE_CODE (0xAF12)
  62 #define FLC_DTA_TYPE_CODE (0xAF44) /* Marks an "Extended FLC" comes from Dave's Targa Animator (DTA) */
  63 #define FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE (0xAF13)
  64
  65 #define CHECK_PIXEL_PTR(n) \
  66     if (pixel_ptr + n > pixel_limit) { \
  67         av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr >= pixel_limit (%d >= %d)\n", \
  68         pixel_ptr + n, pixel_limit); \
  69         return AVERROR_INVALIDDATA; \
  70     } \
  71
  72 typedef struct FlicDecodeContext {
  73     AVCodecContext *avctx;
  74     AVFrame *frame;
  75
  76     unsigned int palette[256];
  77     int new_palette;
  78     int fli_type;  /* either 0xAF11 or 0xAF12, affects palette resolution */
  79 } FlicDecodeContext;
  80
  81 static av_cold int flic_decode_init(AVCodecContext *avctx)
  82 {
  83     FlicDecodeContext *s = avctx->priv_data;
  84     unsigned char *fli_header = (unsigned char *)avctx->extradata;
  85     int depth;
  86
  87     if (avctx->extradata_size != 12 &&
  88         avctx->extradata_size != 128) {
  89         av_log(avctx, AV_LOG_ERROR, "Expected extradata of 12 or 128 bytes\n");
  90         return AVERROR_INVALIDDATA;
  91     }
  92
  93     s->avctx = avctx;
  94
  95     s->fli_type = AV_RL16(&fli_header[4]); /* Might be overridden if a Magic Carpet FLC */
  96
  97     depth = 0;
  98     if (s->avctx->extradata_size == 12) {
  99         /* special case for magic carpet FLIs */
 100         s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE;
 101         depth = 8;
 102     } else {
 103         depth = AV_RL16(&fli_header[12]);
 104     }
 105
 106     if (depth == 0) {
 107         depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
 108     }
 109
 110     if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
 111         depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
 112     }
 113
 114     switch (depth) {
 115         case 8  : avctx->pix_fmt = AV_PIX_FMT_PAL8; break;
 116         case 15 : avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
 117         case 16 : avctx->pix_fmt = AV_PIX_FMT_RGB565; break;
 118         case 24 : avctx->pix_fmt = AV_PIX_FMT_BGR24; /* Supposedly BGR, but no files to test with */
 119                   avpriv_request_sample(avctx, "24bpp FLC/FLX");
 120                   return AVERROR_PATCHWELCOME;
 121         default :
 122                   av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
 123                   return AVERROR_INVALIDDATA;
 124     }
 125
 126     s->frame = av_frame_alloc();
 127     if (!s->frame)
 128         return AVERROR(ENOMEM);
 129
 130     s->new_palette = 0;
 131
 132     return 0;
 133 }
 134
 135 static int flic_decode_frame_8BPP(AVCodecContext *avctx,
 136                                   void *data, int *got_frame,
 137                                   const uint8_t *buf, int buf_size)
 138 {
 139     FlicDecodeContext *s = avctx->priv_data;
 140
 141     GetByteContext g2;
 142     int stream_ptr_after_color_chunk;
 143     int pixel_ptr;
 144     int palette_ptr;
 145     unsigned char palette_idx1;
 146     unsigned char palette_idx2;
 147
 148     unsigned int frame_size;
 149     int num_chunks;
 150
 151     unsigned int chunk_size;
 152     int chunk_type;
 153
 154     int i, j, ret;
 155
 156     int color_packets;
 157     int color_changes;
 158     int color_shift;
 159     unsigned char r, g, b;
 160
 161     int lines;
 162     int compressed_lines;
 163     int starting_line;
 164     signed short line_packets;
 165     int y_ptr;
 166     int byte_run;
 167     int pixel_skip;
 168     int pixel_countdown;
 169     unsigned char *pixels;
 170     unsigned int pixel_limit;
 171
 172     bytestream2_init(&g2, buf, buf_size);
 173
 174     if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) {
 175         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 176         return ret;
 177     }
 178
 179     pixels = s->frame->data[0];
 180     pixel_limit = s->avctx->height * s->frame->linesize[0];
 181     frame_size = bytestream2_get_le32(&g2);
 182     bytestream2_skip(&g2, 2); /* skip the magic number */
 183     num_chunks = bytestream2_get_le16(&g2);
 184     bytestream2_skip(&g2, 8);  /* skip padding */
 185
 186     frame_size -= 16;
 187
 188     /* iterate through the chunks */
 189     while ((frame_size > 0) && (num_chunks > 0)) {
 190         chunk_size = bytestream2_get_le32(&g2);
 191         chunk_type = bytestream2_get_le16(&g2);
 192
 193         switch (chunk_type) {
 194         case FLI_256_COLOR:
 195         case FLI_COLOR:
 196             stream_ptr_after_color_chunk = bytestream2_tell(&g2) + chunk_size - 6;
 197
 198             /* check special case: If this file is from the Magic Carpet
 199              * game and uses 6-bit colors even though it reports 256-color
 200              * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
 201              * initialization) */
 202             if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
 203                 color_shift = 0;
 204             else
 205                 color_shift = 2;
 206             /* set up the palette */
 207             color_packets = bytestream2_get_le16(&g2);
 208             palette_ptr = 0;
 209             for (i = 0; i < color_packets; i++) {
 210                 /* first byte is how many colors to skip */
 211                 palette_ptr += bytestream2_get_byte(&g2);
 212
 213                 /* next byte indicates how many entries to change */
 214                 color_changes = bytestream2_get_byte(&g2);
 215
 216                 /* if there are 0 color changes, there are actually 256 */
 217                 if (color_changes == 0)
 218                     color_changes = 256;
 219
 220                 for (j = 0; j < color_changes; j++) {
 221                     unsigned int entry;
 222
 223                     /* wrap around, for good measure */
 224                     if ((unsigned)palette_ptr >= 256)
 225                         palette_ptr = 0;
 226
 227                     r = bytestream2_get_byte(&g2) << color_shift;
 228                     g = bytestream2_get_byte(&g2) << color_shift;
 229                     b = bytestream2_get_byte(&g2) << color_shift;
 230                     entry = (r << 16) | (g << 8) | b;
 231                     if (s->palette[palette_ptr] != entry)
 232                         s->new_palette = 1;
 233                     s->palette[palette_ptr++] = entry;
 234                 }
 235             }
 236
 237             /* color chunks sometimes have weird 16-bit alignment issues;
 238              * therefore, take the hardline approach and skip
 239              * to the value calculated w.r.t. the size specified by the color
 240              * chunk header */
 241             if (stream_ptr_after_color_chunk - bytestream2_tell(&g2) > 0)
 242                 bytestream2_skip(&g2, stream_ptr_after_color_chunk - bytestream2_tell(&g2));
 243
 244             break;
 245
 246         case FLI_DELTA:
 247             y_ptr = 0;
 248             compressed_lines = bytestream2_get_le16(&g2);
 249             while (compressed_lines > 0) {
 250                 line_packets = bytestream2_get_le16(&g2);
 251                 if ((line_packets & 0xC000) == 0xC000) {
 252                     // line skip opcode
 253                     line_packets = -line_packets;
 254                     y_ptr += line_packets * s->frame->linesize[0];
 255                 } else if ((line_packets & 0xC000) == 0x4000) {
 256                     av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);
 257                 } else if ((line_packets & 0xC000) == 0x8000) {
 258                     // "last byte" opcode
 259                     pixel_ptr= y_ptr + s->frame->linesize[0] - 1;
 260                     CHECK_PIXEL_PTR(0);
 261                     pixels[pixel_ptr] = line_packets & 0xff;
 262                 } else {
 263                     compressed_lines--;
 264                     pixel_ptr = y_ptr;
 265                     CHECK_PIXEL_PTR(0);
 266                     pixel_countdown = s->avctx->width;
 267                     for (i = 0; i < line_packets; i++) {
 268                         /* account for the skip bytes */
 269                         pixel_skip = bytestream2_get_byte(&g2);
 270                         pixel_ptr += pixel_skip;
 271                         pixel_countdown -= pixel_skip;
 272                         byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 273                         if (byte_run < 0) {
 274                             byte_run = -byte_run;
 275                             palette_idx1 = bytestream2_get_byte(&g2);
 276                             palette_idx2 = bytestream2_get_byte(&g2);
 277                             CHECK_PIXEL_PTR(byte_run * 2);
 278                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
 279                                 pixels[pixel_ptr++] = palette_idx1;
 280                                 pixels[pixel_ptr++] = palette_idx2;
 281                             }
 282                         } else {
 283                             CHECK_PIXEL_PTR(byte_run * 2);
 284                             for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
 285                                 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
 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 = bytestream2_get_le16(&g2);
 298             y_ptr = 0;
 299             y_ptr += starting_line * s->frame->linesize[0];
 300
 301             compressed_lines = bytestream2_get_le16(&g2);
 302             while (compressed_lines > 0) {
 303                 pixel_ptr = y_ptr;
 304                 CHECK_PIXEL_PTR(0);
 305                 pixel_countdown = s->avctx->width;
 306                 line_packets = bytestream2_get_byte(&g2);
 307                 if (line_packets > 0) {
 308                     for (i = 0; i < line_packets; i++) {
 309                         /* account for the skip bytes */
 310                         pixel_skip = bytestream2_get_byte(&g2);
 311                         pixel_ptr += pixel_skip;
 312                         pixel_countdown -= pixel_skip;
 313                         byte_run = sign_extend(bytestream2_get_byte(&g2),8);
 314                         if (byte_run > 0) {
 315                             CHECK_PIXEL_PTR(byte_run);
 316                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 317                                 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
 318                             }
 319                         } else if (byte_run < 0) {
 320                             byte_run = -byte_run;
 321                             palette_idx1 = bytestream2_get_byte(&g2);
 322                             CHECK_PIXEL_PTR(byte_run);
 323                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 324                                 pixels[pixel_ptr++] = palette_idx1;
 325                             }
 326                         }
 327                     }
 328                 }
 329
 330                 y_ptr += s->frame->linesize[0];
 331                 compressed_lines--;
 332             }
 333             break;
 334
 335         case FLI_BLACK:
 336             /* set the whole frame to color 0 (which is usually black) */
 337             memset(pixels, 0,
 338                 s->frame->linesize[0] * s->avctx->height);
 339             break;
 340
 341         case FLI_BRUN:
 342             /* Byte run compression: This chunk type only occurs in the first
 343              * FLI frame and it will update the entire frame. */
 344             y_ptr = 0;
 345             for (lines = 0; lines < s->avctx->height; lines++) {
 346                 pixel_ptr = y_ptr;
 347                 /* disregard the line packets; instead, iterate through all
 348                  * pixels on a row */
 349                  bytestream2_skip(&g2, 1);
 350                 pixel_countdown = s->avctx->width;
 351                 while (pixel_countdown > 0) {
 352                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 353                     if (!byte_run) {
 354                         av_log(avctx, AV_LOG_ERROR, "Invalid byte run value.\n");
 355                         return AVERROR_INVALIDDATA;
 356                     }
 357
 358                     if (byte_run > 0) {
 359                         palette_idx1 = bytestream2_get_byte(&g2);
 360                         CHECK_PIXEL_PTR(byte_run);
 361                         for (j = 0; j < byte_run; j++) {
 362                             pixels[pixel_ptr++] = palette_idx1;
 363                             pixel_countdown--;
 364                             if (pixel_countdown < 0)
 365                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 366                                        pixel_countdown, lines);
 367                         }
 368                     } else {  /* copy bytes if byte_run < 0 */
 369                         byte_run = -byte_run;
 370                         CHECK_PIXEL_PTR(byte_run);
 371                         for (j = 0; j < byte_run; j++) {
 372                             pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
 373                             pixel_countdown--;
 374                             if (pixel_countdown < 0)
 375                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 376                                        pixel_countdown, lines);
 377                         }
 378                     }
 379                 }
 380
 381                 y_ptr += s->frame->linesize[0];
 382             }
 383             break;
 384
 385         case FLI_COPY:
 386             /* copy the chunk (uncompressed frame) */
 387             if (chunk_size - 6 > s->avctx->width * s->avctx->height) {
 388                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
 389                        "bigger than image, skipping chunk\n", chunk_size - 6);
 390                 bytestream2_skip(&g2, chunk_size - 6);
 391             } else {
 392                 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;
 393                      y_ptr += s->frame->linesize[0]) {
 394                     bytestream2_get_buffer(&g2, &pixels[y_ptr],
 395                                            s->avctx->width);
 396                 }
 397             }
 398             break;
 399
 400         case FLI_MINI:
 401             /* some sort of a thumbnail? disregard this chunk... */
 402             bytestream2_skip(&g2, 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 ((bytestream2_get_bytes_left(&g2) != 0) &&
 417         (bytestream2_get_bytes_left(&g2) != 1))
 418         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
 419                "and final chunk ptr = %d\n", buf_size,
 420                buf_size - bytestream2_get_bytes_left(&g2));
 421
 422     /* make the palette available on the way out */
 423     memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
 424     if (s->new_palette) {
 425         s->frame->palette_has_changed = 1;
 426         s->new_palette = 0;
 427     }
 428
 429     if ((ret = av_frame_ref(data, s->frame)) < 0)
 430         return ret;
 431
 432     *got_frame = 1;
 433
 434     return buf_size;
 435 }
 436
 437 static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
 438                                       void *data, int *got_frame,
 439                                       const uint8_t *buf, int buf_size)
 440 {
 441     /* Note, the only difference between the 15Bpp and 16Bpp */
 442     /* Format is the pixel format, the packets are processed the same. */
 443     FlicDecodeContext *s = avctx->priv_data;
 444
 445     GetByteContext g2;
 446     int pixel_ptr;
 447     unsigned char palette_idx1;
 448
 449     unsigned int frame_size;
 450     int num_chunks;
 451
 452     unsigned int chunk_size;
 453     int chunk_type;
 454
 455     int i, j, ret;
 456
 457     int lines;
 458     int compressed_lines;
 459     signed short line_packets;
 460     int y_ptr;
 461     int byte_run;
 462     int pixel_skip;
 463     int pixel_countdown;
 464     unsigned char *pixels;
 465     int pixel;
 466     unsigned int pixel_limit;
 467
 468     bytestream2_init(&g2, buf, buf_size);
 469
 470     if ((ret = ff_reget_buffer(avctx, s->frame)) < 0) {
 471         av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
 472         return ret;
 473     }
 474
 475     pixels = s->frame->data[0];
 476     pixel_limit = s->avctx->height * s->frame->linesize[0];
 477
 478     frame_size = bytestream2_get_le32(&g2);
 479     bytestream2_skip(&g2, 2);  /* skip the magic number */
 480     num_chunks = bytestream2_get_le16(&g2);
 481     bytestream2_skip(&g2, 8);  /* skip padding */
 482
 483     frame_size -= 16;
 484
 485     /* iterate through the chunks */
 486     while ((frame_size > 0) && (num_chunks > 0)) {
 487         chunk_size = bytestream2_get_le32(&g2);
 488         chunk_type = bytestream2_get_le16(&g2);
 489
 490         switch (chunk_type) {
 491         case FLI_256_COLOR:
 492         case FLI_COLOR:
 493             /* For some reason, it seems that non-palettized flics do
 494              * include one of these chunks in their first frame.
 495              * Why I do not know, it seems rather extraneous. */
 496             ff_dlog(avctx,
 497                     "Unexpected Palette chunk %d in non-palettized FLC\n",
 498                     chunk_type);
 499             bytestream2_skip(&g2, chunk_size - 6);
 500             break;
 501
 502         case FLI_DELTA:
 503         case FLI_DTA_LC:
 504             y_ptr = 0;
 505             compressed_lines = bytestream2_get_le16(&g2);
 506             while (compressed_lines > 0) {
 507                 line_packets = bytestream2_get_le16(&g2);
 508                 if (line_packets < 0) {
 509                     line_packets = -line_packets;
 510                     y_ptr += line_packets * s->frame->linesize[0];
 511                 } else {
 512                     compressed_lines--;
 513                     pixel_ptr = y_ptr;
 514                     CHECK_PIXEL_PTR(0);
 515                     pixel_countdown = s->avctx->width;
 516                     for (i = 0; i < line_packets; i++) {
 517                         /* account for the skip bytes */
 518                         pixel_skip = bytestream2_get_byte(&g2);
 519                         pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
 520                         pixel_countdown -= pixel_skip;
 521                         byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 522                         if (byte_run < 0) {
 523                             byte_run = -byte_run;
 524                             pixel    = bytestream2_get_le16(&g2);
 525                             CHECK_PIXEL_PTR(2 * byte_run);
 526                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
 527                                 *((signed short*)(&pixels[pixel_ptr])) = pixel;
 528                                 pixel_ptr += 2;
 529                             }
 530                         } else {
 531                             CHECK_PIXEL_PTR(2 * byte_run);
 532                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 533                                 *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
 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-palettized FLC\n");
 546             bytestream2_skip(&g2, 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                 bytestream2_skip(&g2, 1);
 562                 pixel_countdown = (s->avctx->width * 2);
 563
 564                 while (pixel_countdown > 0) {
 565                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 566                     if (byte_run > 0) {
 567                         palette_idx1 = bytestream2_get_byte(&g2);
 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 = bytestream2_get_byte(&g2);
 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 opportunity 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                 bytestream2_skip(&g2, 1);
 614                 pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
 615
 616                 while (pixel_countdown > 0) {
 617                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 618                     if (byte_run > 0) {
 619                         pixel    = bytestream2_get_le16(&g2);
 620                         CHECK_PIXEL_PTR(2 * byte_run);
 621                         for (j = 0; j < byte_run; j++) {
 622                             *((signed short*)(&pixels[pixel_ptr])) = pixel;
 623                             pixel_ptr += 2;
 624                             pixel_countdown--;
 625                             if (pixel_countdown < 0)
 626                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 627                                        pixel_countdown);
 628                         }
 629                     } else {  /* copy pixels if byte_run < 0 */
 630                         byte_run = -byte_run;
 631                         CHECK_PIXEL_PTR(2 * byte_run);
 632                         for (j = 0; j < byte_run; j++) {
 633                             *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
 634                             pixel_ptr  += 2;
 635                             pixel_countdown--;
 636                             if (pixel_countdown < 0)
 637                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 638                                        pixel_countdown);
 639                         }
 640                     }
 641                 }
 642
 643                 y_ptr += s->frame->linesize[0];
 644             }
 645             break;
 646
 647         case FLI_COPY:
 648         case FLI_DTA_COPY:
 649             /* copy the chunk (uncompressed frame) */
 650             if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {
 651                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
 652                        "bigger than image, skipping chunk\n", chunk_size - 6);
 653                 bytestream2_skip(&g2, chunk_size - 6);
 654             } else {
 655
 656                 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;
 657                      y_ptr += s->frame->linesize[0]) {
 658
 659                     pixel_countdown = s->avctx->width;
 660                     pixel_ptr = 0;
 661                     while (pixel_countdown > 0) {
 662                       *((signed short*)(&pixels[y_ptr + pixel_ptr])) = bytestream2_get_le16(&g2);
 663                       pixel_ptr += 2;
 664                       pixel_countdown--;
 665                     }
 666                 }
 667             }
 668             break;
 669
 670         case FLI_MINI:
 671             /* some sort of a thumbnail? disregard this chunk... */
 672             bytestream2_skip(&g2, chunk_size - 6);
 673             break;
 674
 675         default:
 676             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
 677             break;
 678         }
 679
 680         frame_size -= chunk_size;
 681         num_chunks--;
 682     }
 683
 684     /* by the end of the chunk, the stream ptr should equal the frame
 685      * size (minus 1, possibly); if it doesn't, issue a warning */
 686     if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1))
 687         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
 688                "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2));
 689
 690     if ((ret = av_frame_ref(data, s->frame)) < 0)
 691         return ret;
 692
 693     *got_frame = 1;
 694
 695     return buf_size;
 696 }
 697
 698 static int flic_decode_frame(AVCodecContext *avctx,
 699                              void *data, int *got_frame,
 700                              AVPacket *avpkt)
 701 {
 702     const uint8_t *buf = avpkt->data;
 703     int buf_size = avpkt->size;
 704     if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
 705       return flic_decode_frame_8BPP(avctx, data, got_frame,
 706                                     buf, buf_size);
 707     }
 708     else if ((avctx->pix_fmt == AV_PIX_FMT_RGB555) ||
 709              (avctx->pix_fmt == AV_PIX_FMT_RGB565)) {
 710       return flic_decode_frame_15_16BPP(avctx, data, got_frame,
 711                                         buf, buf_size);
 712     }
 713     else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
 714         avpriv_request_sample(avctx, "24bpp FLC");
 715         return AVERROR_PATCHWELCOME;
 716     }
 717
 718     /* Should not get  here, ever as the pix_fmt is processed */
 719     /* in flic_decode_init and the above if should deal with */
 720     /* the finite set of possibilities allowable by here. */
 721     /* But in case we do, just error out. */
 722     av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");
 723     return AVERROR_BUG;
 724 }
 725
 726
 727 static av_cold int flic_decode_end(AVCodecContext *avctx)
 728 {
 729     FlicDecodeContext *s = avctx->priv_data;
 730
 731     av_frame_free(&s->frame);
 732
 733     return 0;
 734 }
 735
 736 AVCodec ff_flic_decoder = {
 737     .name           = "flic",
 738     .long_name      = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"),
 739     .type           = AVMEDIA_TYPE_VIDEO,
 740     .id             = AV_CODEC_ID_FLIC,
 741     .priv_data_size = sizeof(FlicDecodeContext),
 742     .init           = flic_decode_init,
 743     .close          = flic_decode_end,
 744     .decode         = flic_decode_frame,
 745     .capabilities   = AV_CODEC_CAP_DR1,
 746 };