ffmpeg/libavcodec/flicvideo.c

   1 /*
   2  * FLI/FLC Animation Video Decoder
   3  * Copyright (c) 2003, 2004 The FFmpeg Project
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  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_ERROR, "Invalid pixel_ptr = %d > pixel_limit = %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 != 0 &&
  88         avctx->extradata_size != 12 &&
  89         avctx->extradata_size != 128 &&
  90         avctx->extradata_size != 256 &&
  91         avctx->extradata_size != 904 &&
  92         avctx->extradata_size != 1024) {
  93         av_log(avctx, AV_LOG_ERROR, "Unexpected extradata size %d\n", avctx->extradata_size);
  94         return AVERROR_INVALIDDATA;
  95     }
  96
  97     s->avctx = avctx;
  98
  99     if (s->avctx->extradata_size == 12) {
 100         /* special case for magic carpet FLIs */
 101         s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE;
 102         depth = 8;
 103     } else if (avctx->extradata_size == 1024) {
 104         uint8_t *ptr = avctx->extradata;
 105         int i;
 106
 107         for (i = 0; i < 256; i++) {
 108             s->palette[i] = AV_RL32(ptr);
 109             ptr += 4;
 110         }
 111         depth = 8;
 112         /* FLI in MOV, see e.g. FFmpeg trac issue #626 */
 113     } else if (avctx->extradata_size == 0 ||
 114                avctx->extradata_size == 256 ||
 115         /* see FFmpeg ticket #1234 */
 116                avctx->extradata_size == 904) {
 117         s->fli_type = FLI_TYPE_CODE;
 118         depth = 8;
 119     } else {
 120         s->fli_type = AV_RL16(&fli_header[4]);
 121         depth = AV_RL16(&fli_header[12]);
 122     }
 123
 124     if (depth == 0) {
 125         depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
 126     }
 127
 128     if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
 129         depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
 130     }
 131
 132     switch (depth) {
 133         case 8  : avctx->pix_fmt = AV_PIX_FMT_PAL8; break;
 134         case 15 : avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
 135         case 16 : avctx->pix_fmt = AV_PIX_FMT_RGB565; break;
 136         case 24 : avctx->pix_fmt = AV_PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */
 137                   avpriv_request_sample(avctx, "24Bpp FLC/FLX");
 138                   return AVERROR_PATCHWELCOME;
 139         default :
 140                   av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
 141                   return AVERROR_INVALIDDATA;
 142     }
 143
 144     s->frame = av_frame_alloc();
 145     if (!s->frame)
 146         return AVERROR(ENOMEM);
 147
 148     s->new_palette = 0;
 149
 150     return 0;
 151 }
 152
 153 static int flic_decode_frame_8BPP(AVCodecContext *avctx,
 154                                   void *data, int *got_frame,
 155                                   const uint8_t *buf, int buf_size)
 156 {
 157     FlicDecodeContext *s = avctx->priv_data;
 158
 159     GetByteContext g2;
 160     int pixel_ptr;
 161     int palette_ptr;
 162     unsigned char palette_idx1;
 163     unsigned char palette_idx2;
 164
 165     unsigned int frame_size;
 166     int num_chunks;
 167
 168     unsigned int chunk_size;
 169     int chunk_type;
 170
 171     int i, j, ret;
 172
 173     int color_packets;
 174     int color_changes;
 175     int color_shift;
 176     unsigned char r, g, b;
 177
 178     int lines;
 179     int compressed_lines;
 180     int starting_line;
 181     signed short line_packets;
 182     int y_ptr;
 183     int byte_run;
 184     int pixel_skip;
 185     int pixel_countdown;
 186     unsigned char *pixels;
 187     unsigned int pixel_limit;
 188
 189     bytestream2_init(&g2, buf, buf_size);
 190
 191     if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
 192         return ret;
 193
 194     pixels = s->frame->data[0];
 195     pixel_limit = s->avctx->height * s->frame->linesize[0];
 196     if (buf_size < 16 || buf_size > INT_MAX - (3 * 256 + FF_INPUT_BUFFER_PADDING_SIZE))
 197         return AVERROR_INVALIDDATA;
 198     frame_size = bytestream2_get_le32(&g2);
 199     if (frame_size > buf_size)
 200         frame_size = buf_size;
 201     bytestream2_skip(&g2, 2); /* skip the magic number */
 202     num_chunks = bytestream2_get_le16(&g2);
 203     bytestream2_skip(&g2, 8);  /* skip padding */
 204
 205     frame_size -= 16;
 206
 207     /* iterate through the chunks */
 208     while ((frame_size >= 6) && (num_chunks > 0) &&
 209             bytestream2_get_bytes_left(&g2) >= 4) {
 210         int stream_ptr_after_chunk;
 211         chunk_size = bytestream2_get_le32(&g2);
 212         if (chunk_size > frame_size) {
 213             av_log(avctx, AV_LOG_WARNING,
 214                    "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);
 215             chunk_size = frame_size;
 216         }
 217         stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
 218
 219         chunk_type = bytestream2_get_le16(&g2);
 220
 221         switch (chunk_type) {
 222         case FLI_256_COLOR:
 223         case FLI_COLOR:
 224             /* check special case: If this file is from the Magic Carpet
 225              * game and uses 6-bit colors even though it reports 256-color
 226              * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
 227              * initialization) */
 228             if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
 229                 color_shift = 0;
 230             else
 231                 color_shift = 2;
 232             /* set up the palette */
 233             color_packets = bytestream2_get_le16(&g2);
 234             palette_ptr = 0;
 235             for (i = 0; i < color_packets; i++) {
 236                 /* first byte is how many colors to skip */
 237                 palette_ptr += bytestream2_get_byte(&g2);
 238
 239                 /* next byte indicates how many entries to change */
 240                 color_changes = bytestream2_get_byte(&g2);
 241
 242                 /* if there are 0 color changes, there are actually 256 */
 243                 if (color_changes == 0)
 244                     color_changes = 256;
 245
 246                 if (bytestream2_tell(&g2) + color_changes * 3 > stream_ptr_after_chunk)
 247                     break;
 248
 249                 for (j = 0; j < color_changes; j++) {
 250                     unsigned int entry;
 251
 252                     /* wrap around, for good measure */
 253                     if ((unsigned)palette_ptr >= 256)
 254                         palette_ptr = 0;
 255
 256                     r = bytestream2_get_byte(&g2) << color_shift;
 257                     g = bytestream2_get_byte(&g2) << color_shift;
 258                     b = bytestream2_get_byte(&g2) << color_shift;
 259                     entry = 0xFFU << 24 | r << 16 | g << 8 | b;
 260                     if (color_shift == 2)
 261                         entry |= entry >> 6 & 0x30303;
 262                     if (s->palette[palette_ptr] != entry)
 263                         s->new_palette = 1;
 264                     s->palette[palette_ptr++] = entry;
 265                 }
 266             }
 267             break;
 268
 269         case FLI_DELTA:
 270             y_ptr = 0;
 271             compressed_lines = bytestream2_get_le16(&g2);
 272             while (compressed_lines > 0) {
 273                 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
 274                     break;
 275                 line_packets = bytestream2_get_le16(&g2);
 276                 if ((line_packets & 0xC000) == 0xC000) {
 277                     // line skip opcode
 278                     line_packets = -line_packets;
 279                     y_ptr += line_packets * s->frame->linesize[0];
 280                 } else if ((line_packets & 0xC000) == 0x4000) {
 281                     av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);
 282                 } else if ((line_packets & 0xC000) == 0x8000) {
 283                     // "last byte" opcode
 284                     pixel_ptr= y_ptr + s->frame->linesize[0] - 1;
 285                     CHECK_PIXEL_PTR(0);
 286                     pixels[pixel_ptr] = line_packets & 0xff;
 287                 } else {
 288                     compressed_lines--;
 289                     pixel_ptr = y_ptr;
 290                     CHECK_PIXEL_PTR(0);
 291                     pixel_countdown = s->avctx->width;
 292                     for (i = 0; i < line_packets; i++) {
 293                         if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
 294                             break;
 295                         /* account for the skip bytes */
 296                         pixel_skip = bytestream2_get_byte(&g2);
 297                         pixel_ptr += pixel_skip;
 298                         pixel_countdown -= pixel_skip;
 299                         byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 300                         if (byte_run < 0) {
 301                             byte_run = -byte_run;
 302                             palette_idx1 = bytestream2_get_byte(&g2);
 303                             palette_idx2 = bytestream2_get_byte(&g2);
 304                             CHECK_PIXEL_PTR(byte_run * 2);
 305                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
 306                                 pixels[pixel_ptr++] = palette_idx1;
 307                                 pixels[pixel_ptr++] = palette_idx2;
 308                             }
 309                         } else {
 310                             CHECK_PIXEL_PTR(byte_run * 2);
 311                             if (bytestream2_tell(&g2) + byte_run * 2 > stream_ptr_after_chunk)
 312                                 break;
 313                             for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
 314                                 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
 315                             }
 316                         }
 317                     }
 318
 319                     y_ptr += s->frame->linesize[0];
 320                 }
 321             }
 322             break;
 323
 324         case FLI_LC:
 325             /* line compressed */
 326             starting_line = bytestream2_get_le16(&g2);
 327             y_ptr = 0;
 328             y_ptr += starting_line * s->frame->linesize[0];
 329
 330             compressed_lines = bytestream2_get_le16(&g2);
 331             while (compressed_lines > 0) {
 332                 pixel_ptr = y_ptr;
 333                 CHECK_PIXEL_PTR(0);
 334                 pixel_countdown = s->avctx->width;
 335                 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
 336                     break;
 337                 line_packets = bytestream2_get_byte(&g2);
 338                 if (line_packets > 0) {
 339                     for (i = 0; i < line_packets; i++) {
 340                         /* account for the skip bytes */
 341                         if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
 342                             break;
 343                         pixel_skip = bytestream2_get_byte(&g2);
 344                         pixel_ptr += pixel_skip;
 345                         pixel_countdown -= pixel_skip;
 346                         byte_run = sign_extend(bytestream2_get_byte(&g2),8);
 347                         if (byte_run > 0) {
 348                             CHECK_PIXEL_PTR(byte_run);
 349                             if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
 350                                 break;
 351                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 352                                 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
 353                             }
 354                         } else if (byte_run < 0) {
 355                             byte_run = -byte_run;
 356                             palette_idx1 = bytestream2_get_byte(&g2);
 357                             CHECK_PIXEL_PTR(byte_run);
 358                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 359                                 pixels[pixel_ptr++] = palette_idx1;
 360                             }
 361                         }
 362                     }
 363                 }
 364
 365                 y_ptr += s->frame->linesize[0];
 366                 compressed_lines--;
 367             }
 368             break;
 369
 370         case FLI_BLACK:
 371             /* set the whole frame to color 0 (which is usually black) */
 372             memset(pixels, 0,
 373                 s->frame->linesize[0] * s->avctx->height);
 374             break;
 375
 376         case FLI_BRUN:
 377             /* Byte run compression: This chunk type only occurs in the first
 378              * FLI frame and it will update the entire frame. */
 379             y_ptr = 0;
 380             for (lines = 0; lines < s->avctx->height; lines++) {
 381                 pixel_ptr = y_ptr;
 382                 /* disregard the line packets; instead, iterate through all
 383                  * pixels on a row */
 384                  bytestream2_skip(&g2, 1);
 385                 pixel_countdown = s->avctx->width;
 386                 while (pixel_countdown > 0) {
 387                     if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
 388                         break;
 389                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 390                     if (!byte_run) {
 391                         av_log(avctx, AV_LOG_ERROR, "Invalid byte run value.\n");
 392                         return AVERROR_INVALIDDATA;
 393                     }
 394
 395                     if (byte_run > 0) {
 396                         palette_idx1 = bytestream2_get_byte(&g2);
 397                         CHECK_PIXEL_PTR(byte_run);
 398                         for (j = 0; j < byte_run; j++) {
 399                             pixels[pixel_ptr++] = palette_idx1;
 400                             pixel_countdown--;
 401                             if (pixel_countdown < 0)
 402                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 403                                        pixel_countdown, lines);
 404                         }
 405                     } else {  /* copy bytes if byte_run < 0 */
 406                         byte_run = -byte_run;
 407                         CHECK_PIXEL_PTR(byte_run);
 408                         if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
 409                             break;
 410                         for (j = 0; j < byte_run; j++) {
 411                             pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
 412                             pixel_countdown--;
 413                             if (pixel_countdown < 0)
 414                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 415                                        pixel_countdown, lines);
 416                         }
 417                     }
 418                 }
 419
 420                 y_ptr += s->frame->linesize[0];
 421             }
 422             break;
 423
 424         case FLI_COPY:
 425             /* copy the chunk (uncompressed frame) */
 426             if (chunk_size - 6 != s->avctx->width * s->avctx->height) {
 427                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
 428                        "has incorrect size, skipping chunk\n", chunk_size - 6);
 429                 bytestream2_skip(&g2, chunk_size - 6);
 430             } else {
 431                 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;
 432                      y_ptr += s->frame->linesize[0]) {
 433                     bytestream2_get_buffer(&g2, &pixels[y_ptr],
 434                                            s->avctx->width);
 435                 }
 436             }
 437             break;
 438
 439         case FLI_MINI:
 440             /* some sort of a thumbnail? disregard this chunk... */
 441             break;
 442
 443         default:
 444             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
 445             break;
 446         }
 447
 448         if (stream_ptr_after_chunk - bytestream2_tell(&g2) > 0)
 449             bytestream2_skip(&g2, stream_ptr_after_chunk - bytestream2_tell(&g2));
 450
 451         frame_size -= chunk_size;
 452         num_chunks--;
 453     }
 454
 455     /* by the end of the chunk, the stream ptr should equal the frame
 456      * size (minus 1 or 2, possibly); if it doesn't, issue a warning */
 457     if (bytestream2_get_bytes_left(&g2) > 2)
 458         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
 459                "and final chunk ptr = %d\n", buf_size,
 460                buf_size - bytestream2_get_bytes_left(&g2));
 461
 462     /* make the palette available on the way out */
 463     memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
 464     if (s->new_palette) {
 465         s->frame->palette_has_changed = 1;
 466         s->new_palette = 0;
 467     }
 468
 469     if ((ret = av_frame_ref(data, s->frame)) < 0)
 470         return ret;
 471
 472     *got_frame = 1;
 473
 474     return buf_size;
 475 }
 476
 477 static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
 478                                       void *data, int *got_frame,
 479                                       const uint8_t *buf, int buf_size)
 480 {
 481     /* Note, the only difference between the 15Bpp and 16Bpp */
 482     /* Format is the pixel format, the packets are processed the same. */
 483     FlicDecodeContext *s = avctx->priv_data;
 484
 485     GetByteContext g2;
 486     int pixel_ptr;
 487     unsigned char palette_idx1;
 488
 489     unsigned int frame_size;
 490     int num_chunks;
 491
 492     unsigned int chunk_size;
 493     int chunk_type;
 494
 495     int i, j, ret;
 496
 497     int lines;
 498     int compressed_lines;
 499     signed short line_packets;
 500     int y_ptr;
 501     int byte_run;
 502     int pixel_skip;
 503     int pixel_countdown;
 504     unsigned char *pixels;
 505     int pixel;
 506     unsigned int pixel_limit;
 507
 508     bytestream2_init(&g2, buf, buf_size);
 509
 510     if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
 511         return ret;
 512
 513     pixels = s->frame->data[0];
 514     pixel_limit = s->avctx->height * s->frame->linesize[0];
 515
 516     frame_size = bytestream2_get_le32(&g2);
 517     bytestream2_skip(&g2, 2);  /* skip the magic number */
 518     num_chunks = bytestream2_get_le16(&g2);
 519     bytestream2_skip(&g2, 8);  /* skip padding */
 520     if (frame_size > buf_size)
 521         frame_size = buf_size;
 522
 523     frame_size -= 16;
 524
 525     /* iterate through the chunks */
 526     while ((frame_size > 0) && (num_chunks > 0) &&
 527             bytestream2_get_bytes_left(&g2) >= 4) {
 528         int stream_ptr_after_chunk;
 529         chunk_size = bytestream2_get_le32(&g2);
 530         if (chunk_size > frame_size) {
 531             av_log(avctx, AV_LOG_WARNING,
 532                    "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);
 533             chunk_size = frame_size;
 534         }
 535         stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
 536
 537         chunk_type = bytestream2_get_le16(&g2);
 538
 539
 540         switch (chunk_type) {
 541         case FLI_256_COLOR:
 542         case FLI_COLOR:
 543             /* For some reason, it seems that non-palettized flics do
 544              * include one of these chunks in their first frame.
 545              * Why I do not know, it seems rather extraneous. */
 546             av_dlog(avctx,
 547                     "Unexpected Palette chunk %d in non-palettized FLC\n",
 548                     chunk_type);
 549             bytestream2_skip(&g2, chunk_size - 6);
 550             break;
 551
 552         case FLI_DELTA:
 553         case FLI_DTA_LC:
 554             y_ptr = 0;
 555             compressed_lines = bytestream2_get_le16(&g2);
 556             while (compressed_lines > 0) {
 557                 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
 558                     break;
 559                 line_packets = bytestream2_get_le16(&g2);
 560                 if (line_packets < 0) {
 561                     line_packets = -line_packets;
 562                     y_ptr += line_packets * s->frame->linesize[0];
 563                 } else {
 564                     compressed_lines--;
 565                     pixel_ptr = y_ptr;
 566                     CHECK_PIXEL_PTR(0);
 567                     pixel_countdown = s->avctx->width;
 568                     for (i = 0; i < line_packets; i++) {
 569                         /* account for the skip bytes */
 570                         if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
 571                             break;
 572                         pixel_skip = bytestream2_get_byte(&g2);
 573                         pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
 574                         pixel_countdown -= pixel_skip;
 575                         byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 576                         if (byte_run < 0) {
 577                             byte_run = -byte_run;
 578                             pixel    = bytestream2_get_le16(&g2);
 579                             CHECK_PIXEL_PTR(2 * byte_run);
 580                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
 581                                 *((signed short*)(&pixels[pixel_ptr])) = pixel;
 582                                 pixel_ptr += 2;
 583                             }
 584                         } else {
 585                             if (bytestream2_tell(&g2) + 2*byte_run > stream_ptr_after_chunk)
 586                                 break;
 587                             CHECK_PIXEL_PTR(2 * byte_run);
 588                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 589                                 *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
 590                                 pixel_ptr += 2;
 591                             }
 592                         }
 593                     }
 594
 595                     y_ptr += s->frame->linesize[0];
 596                 }
 597             }
 598             break;
 599
 600         case FLI_LC:
 601             av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-palettized FLC\n");
 602             bytestream2_skip(&g2, chunk_size - 6);
 603             break;
 604
 605         case FLI_BLACK:
 606             /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */
 607             memset(pixels, 0x0000,
 608                    s->frame->linesize[0] * s->avctx->height);
 609             break;
 610
 611         case FLI_BRUN:
 612             y_ptr = 0;
 613             for (lines = 0; lines < s->avctx->height; lines++) {
 614                 pixel_ptr = y_ptr;
 615                 /* disregard the line packets; instead, iterate through all
 616                  * pixels on a row */
 617                 bytestream2_skip(&g2, 1);
 618                 pixel_countdown = (s->avctx->width * 2);
 619
 620                 while (pixel_countdown > 0) {
 621                     if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
 622                         break;
 623                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 624                     if (byte_run > 0) {
 625                         palette_idx1 = bytestream2_get_byte(&g2);
 626                         CHECK_PIXEL_PTR(byte_run);
 627                         for (j = 0; j < byte_run; j++) {
 628                             pixels[pixel_ptr++] = palette_idx1;
 629                             pixel_countdown--;
 630                             if (pixel_countdown < 0)
 631                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
 632                                        pixel_countdown, lines);
 633                         }
 634                     } else {  /* copy bytes if byte_run < 0 */
 635                         byte_run = -byte_run;
 636                         if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
 637                             break;
 638                         CHECK_PIXEL_PTR(byte_run);
 639                         for (j = 0; j < byte_run; j++) {
 640                             palette_idx1 = bytestream2_get_byte(&g2);
 641                             pixels[pixel_ptr++] = palette_idx1;
 642                             pixel_countdown--;
 643                             if (pixel_countdown < 0)
 644                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 645                                        pixel_countdown, lines);
 646                         }
 647                     }
 648                 }
 649
 650                 /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
 651                  * This does not give us any good opportunity to perform word endian conversion
 652                  * during decompression. So if it is required (i.e., this is not a LE target, we do
 653                  * a second pass over the line here, swapping the bytes.
 654                  */
 655 #if HAVE_BIGENDIAN
 656                 pixel_ptr = y_ptr;
 657                 pixel_countdown = s->avctx->width;
 658                 while (pixel_countdown > 0) {
 659                     *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]);
 660                     pixel_ptr += 2;
 661                 }
 662 #endif
 663                 y_ptr += s->frame->linesize[0];
 664             }
 665             break;
 666
 667         case FLI_DTA_BRUN:
 668             y_ptr = 0;
 669             for (lines = 0; lines < s->avctx->height; lines++) {
 670                 pixel_ptr = y_ptr;
 671                 /* disregard the line packets; instead, iterate through all
 672                  * pixels on a row */
 673                 bytestream2_skip(&g2, 1);
 674                 pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
 675
 676                 while (pixel_countdown > 0) {
 677                     if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
 678                         break;
 679                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 680                     if (byte_run > 0) {
 681                         pixel    = bytestream2_get_le16(&g2);
 682                         CHECK_PIXEL_PTR(2 * byte_run);
 683                         for (j = 0; j < byte_run; j++) {
 684                             *((signed short*)(&pixels[pixel_ptr])) = pixel;
 685                             pixel_ptr += 2;
 686                             pixel_countdown--;
 687                             if (pixel_countdown < 0)
 688                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 689                                        pixel_countdown);
 690                         }
 691                     } else {  /* copy pixels if byte_run < 0 */
 692                         byte_run = -byte_run;
 693                         if (bytestream2_tell(&g2) + 2 * byte_run > stream_ptr_after_chunk)
 694                             break;
 695                         CHECK_PIXEL_PTR(2 * byte_run);
 696                         for (j = 0; j < byte_run; j++) {
 697                             *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
 698                             pixel_ptr  += 2;
 699                             pixel_countdown--;
 700                             if (pixel_countdown < 0)
 701                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 702                                        pixel_countdown);
 703                         }
 704                     }
 705                 }
 706
 707                 y_ptr += s->frame->linesize[0];
 708             }
 709             break;
 710
 711         case FLI_COPY:
 712         case FLI_DTA_COPY:
 713             /* copy the chunk (uncompressed frame) */
 714             if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {
 715                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
 716                        "bigger than image, skipping chunk\n", chunk_size - 6);
 717                 bytestream2_skip(&g2, chunk_size - 6);
 718             } else {
 719
 720                 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;
 721                      y_ptr += s->frame->linesize[0]) {
 722
 723                     pixel_countdown = s->avctx->width;
 724                     pixel_ptr = 0;
 725                     while (pixel_countdown > 0) {
 726                       *((signed short*)(&pixels[y_ptr + pixel_ptr])) = bytestream2_get_le16(&g2);
 727                       pixel_ptr += 2;
 728                       pixel_countdown--;
 729                     }
 730                 }
 731             }
 732             break;
 733
 734         case FLI_MINI:
 735             /* some sort of a thumbnail? disregard this chunk... */
 736             bytestream2_skip(&g2, chunk_size - 6);
 737             break;
 738
 739         default:
 740             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
 741             break;
 742         }
 743
 744         frame_size -= chunk_size;
 745         num_chunks--;
 746     }
 747
 748     /* by the end of the chunk, the stream ptr should equal the frame
 749      * size (minus 1, possibly); if it doesn't, issue a warning */
 750     if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1))
 751         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
 752                "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2));
 753
 754     if ((ret = av_frame_ref(data, s->frame)) < 0)
 755         return ret;
 756
 757     *got_frame = 1;
 758
 759     return buf_size;
 760 }
 761
 762 static int flic_decode_frame_24BPP(AVCodecContext *avctx,
 763                                    void *data, int *got_frame,
 764                                    const uint8_t *buf, int buf_size)
 765 {
 766   av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
 767   return AVERROR_PATCHWELCOME;
 768 }
 769
 770 static int flic_decode_frame(AVCodecContext *avctx,
 771                              void *data, int *got_frame,
 772                              AVPacket *avpkt)
 773 {
 774     const uint8_t *buf = avpkt->data;
 775     int buf_size = avpkt->size;
 776     if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
 777       return flic_decode_frame_8BPP(avctx, data, got_frame,
 778                                     buf, buf_size);
 779     }
 780     else if ((avctx->pix_fmt == AV_PIX_FMT_RGB555) ||
 781              (avctx->pix_fmt == AV_PIX_FMT_RGB565)) {
 782       return flic_decode_frame_15_16BPP(avctx, data, got_frame,
 783                                         buf, buf_size);
 784     }
 785     else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
 786       return flic_decode_frame_24BPP(avctx, data, got_frame,
 787                                      buf, buf_size);
 788     }
 789
 790     /* Should not get  here, ever as the pix_fmt is processed */
 791     /* in flic_decode_init and the above if should deal with */
 792     /* the finite set of possibilites allowable by here. */
 793     /* But in case we do, just error out. */
 794     av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");
 795     return AVERROR_BUG;
 796 }
 797
 798
 799 static av_cold int flic_decode_end(AVCodecContext *avctx)
 800 {
 801     FlicDecodeContext *s = avctx->priv_data;
 802
 803     av_frame_free(&s->frame);
 804
 805     return 0;
 806 }
 807
 808 AVCodec ff_flic_decoder = {
 809     .name           = "flic",
 810     .long_name      = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"),
 811     .type           = AVMEDIA_TYPE_VIDEO,
 812     .id             = AV_CODEC_ID_FLIC,
 813     .priv_data_size = sizeof(FlicDecodeContext),
 814     .init           = flic_decode_init,
 815     .close          = flic_decode_end,
 816     .decode         = flic_decode_frame,
 817     .capabilities   = CODEC_CAP_DR1,
 818 };