git.sesse.net Git - ffmpeg/blob - 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/BGR24. To use this decoder, be
  31  * sure that your demuxer sends the FLI file header to the decoder via
  32  * the extradata chunk in AVCodecContext. The chunk should be 128 bytes
  33  * large. The only exception is for FLI files from the game "Magic Carpet",
  34  * in which the header is only 12 bytes.
  35  */
  36
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40
  41 #include "libavutil/intreadwrite.h"
  42 #include "avcodec.h"
  43 #include "bytestream.h"
  44 #include "internal.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_ERROR, "Invalid pixel_ptr = %d > pixel_limit = %d\n", \
  67         pixel_ptr + n, pixel_limit); \
  68         return AVERROR_INVALIDDATA; \
  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 != 0 &&
  87         avctx->extradata_size != 12 &&
  88         avctx->extradata_size != 128 &&
  89         avctx->extradata_size != 256 &&
  90         avctx->extradata_size != 904 &&
  91         avctx->extradata_size != 1024) {
  92         av_log(avctx, AV_LOG_ERROR, "Unexpected extradata size %d\n", avctx->extradata_size);
  93         return AVERROR_INVALIDDATA;
  94     }
  95
  96     s->avctx = avctx;
  97
  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 if (avctx->extradata_size == 1024) {
 103         uint8_t *ptr = avctx->extradata;
 104         int i;
 105
 106         for (i = 0; i < 256; i++) {
 107             s->palette[i] = AV_RL32(ptr);
 108             ptr += 4;
 109         }
 110         depth = 8;
 111         /* FLI in MOV, see e.g. FFmpeg trac issue #626 */
 112     } else if (avctx->extradata_size == 0 ||
 113                avctx->extradata_size == 256 ||
 114         /* see FFmpeg ticket #1234 */
 115                avctx->extradata_size == 904) {
 116         s->fli_type = FLI_TYPE_CODE;
 117         depth = 8;
 118     } else {
 119         s->fli_type = AV_RL16(&fli_header[4]);
 120         depth = AV_RL16(&fli_header[12]);
 121     }
 122
 123     if (depth == 0) {
 124         depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
 125     }
 126
 127     if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
 128         depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
 129     }
 130
 131     switch (depth) {
 132         case 8  : avctx->pix_fmt = AV_PIX_FMT_PAL8; break;
 133         case 15 : avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
 134         case 16 : avctx->pix_fmt = AV_PIX_FMT_RGB565; break;
 135         case 24 : avctx->pix_fmt = AV_PIX_FMT_BGR24; break;
 136         default :
 137                   av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
 138                   return AVERROR_INVALIDDATA;
 139     }
 140
 141     s->frame = av_frame_alloc();
 142     if (!s->frame)
 143         return AVERROR(ENOMEM);
 144
 145     s->new_palette = 0;
 146
 147     return 0;
 148 }
 149
 150 static int flic_decode_frame_8BPP(AVCodecContext *avctx,
 151                                   void *data, int *got_frame,
 152                                   const uint8_t *buf, int buf_size)
 153 {
 154     FlicDecodeContext *s = avctx->priv_data;
 155
 156     GetByteContext g2;
 157     int pixel_ptr;
 158     int palette_ptr;
 159     unsigned char palette_idx1;
 160     unsigned char palette_idx2;
 161
 162     unsigned int frame_size;
 163     int num_chunks;
 164
 165     unsigned int chunk_size;
 166     int chunk_type;
 167
 168     int i, j, ret;
 169
 170     int color_packets;
 171     int color_changes;
 172     int color_shift;
 173     unsigned char r, g, b;
 174
 175     int lines;
 176     int compressed_lines;
 177     int starting_line;
 178     signed short line_packets;
 179     int y_ptr;
 180     int byte_run;
 181     int pixel_skip;
 182     int pixel_countdown;
 183     unsigned char *pixels;
 184     unsigned int pixel_limit;
 185
 186     bytestream2_init(&g2, buf, buf_size);
 187
 188     if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
 189         return ret;
 190
 191     pixels = s->frame->data[0];
 192     pixel_limit = s->avctx->height * s->frame->linesize[0];
 193     if (buf_size < 16 || buf_size > INT_MAX - (3 * 256 + AV_INPUT_BUFFER_PADDING_SIZE))
 194         return AVERROR_INVALIDDATA;
 195     frame_size = bytestream2_get_le32(&g2);
 196     if (frame_size > buf_size)
 197         frame_size = buf_size;
 198     bytestream2_skip(&g2, 2); /* skip the magic number */
 199     num_chunks = bytestream2_get_le16(&g2);
 200     bytestream2_skip(&g2, 8);  /* skip padding */
 201
 202     frame_size -= 16;
 203
 204     /* iterate through the chunks */
 205     while ((frame_size >= 6) && (num_chunks > 0) &&
 206             bytestream2_get_bytes_left(&g2) >= 4) {
 207         int stream_ptr_after_chunk;
 208         chunk_size = bytestream2_get_le32(&g2);
 209         if (chunk_size > frame_size) {
 210             av_log(avctx, AV_LOG_WARNING,
 211                    "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);
 212             chunk_size = frame_size;
 213         }
 214         stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
 215
 216         chunk_type = bytestream2_get_le16(&g2);
 217
 218         switch (chunk_type) {
 219         case FLI_256_COLOR:
 220         case FLI_COLOR:
 221             /* check special case: If this file is from the Magic Carpet
 222              * game and uses 6-bit colors even though it reports 256-color
 223              * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
 224              * initialization) */
 225             if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
 226                 color_shift = 0;
 227             else
 228                 color_shift = 2;
 229             /* set up the palette */
 230             color_packets = bytestream2_get_le16(&g2);
 231             palette_ptr = 0;
 232             for (i = 0; i < color_packets; i++) {
 233                 /* first byte is how many colors to skip */
 234                 palette_ptr += bytestream2_get_byte(&g2);
 235
 236                 /* next byte indicates how many entries to change */
 237                 color_changes = bytestream2_get_byte(&g2);
 238
 239                 /* if there are 0 color changes, there are actually 256 */
 240                 if (color_changes == 0)
 241                     color_changes = 256;
 242
 243                 if (bytestream2_tell(&g2) + color_changes * 3 > stream_ptr_after_chunk)
 244                     break;
 245
 246                 for (j = 0; j < color_changes; j++) {
 247                     unsigned int entry;
 248
 249                     /* wrap around, for good measure */
 250                     if ((unsigned)palette_ptr >= 256)
 251                         palette_ptr = 0;
 252
 253                     r = bytestream2_get_byte(&g2) << color_shift;
 254                     g = bytestream2_get_byte(&g2) << color_shift;
 255                     b = bytestream2_get_byte(&g2) << color_shift;
 256                     entry = 0xFFU << 24 | r << 16 | g << 8 | b;
 257                     if (color_shift == 2)
 258                         entry |= entry >> 6 & 0x30303;
 259                     if (s->palette[palette_ptr] != entry)
 260                         s->new_palette = 1;
 261                     s->palette[palette_ptr++] = entry;
 262                 }
 263             }
 264             break;
 265
 266         case FLI_DELTA:
 267             y_ptr = 0;
 268             compressed_lines = bytestream2_get_le16(&g2);
 269             while (compressed_lines > 0) {
 270                 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
 271                     break;
 272                 line_packets = bytestream2_get_le16(&g2);
 273                 if ((line_packets & 0xC000) == 0xC000) {
 274                     // line skip opcode
 275                     line_packets = -line_packets;
 276                     y_ptr += line_packets * s->frame->linesize[0];
 277                 } else if ((line_packets & 0xC000) == 0x4000) {
 278                     av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);
 279                 } else if ((line_packets & 0xC000) == 0x8000) {
 280                     // "last byte" opcode
 281                     pixel_ptr= y_ptr + s->frame->linesize[0] - 1;
 282                     CHECK_PIXEL_PTR(0);
 283                     pixels[pixel_ptr] = line_packets & 0xff;
 284                 } else {
 285                     compressed_lines--;
 286                     pixel_ptr = y_ptr;
 287                     CHECK_PIXEL_PTR(0);
 288                     pixel_countdown = s->avctx->width;
 289                     for (i = 0; i < line_packets; i++) {
 290                         if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
 291                             break;
 292                         /* account for the skip bytes */
 293                         pixel_skip = bytestream2_get_byte(&g2);
 294                         pixel_ptr += pixel_skip;
 295                         pixel_countdown -= pixel_skip;
 296                         byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 297                         if (byte_run < 0) {
 298                             byte_run = -byte_run;
 299                             palette_idx1 = bytestream2_get_byte(&g2);
 300                             palette_idx2 = bytestream2_get_byte(&g2);
 301                             CHECK_PIXEL_PTR(byte_run * 2);
 302                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
 303                                 pixels[pixel_ptr++] = palette_idx1;
 304                                 pixels[pixel_ptr++] = palette_idx2;
 305                             }
 306                         } else {
 307                             CHECK_PIXEL_PTR(byte_run * 2);
 308                             if (bytestream2_tell(&g2) + byte_run * 2 > stream_ptr_after_chunk)
 309                                 break;
 310                             for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
 311                                 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
 312                             }
 313                         }
 314                     }
 315
 316                     y_ptr += s->frame->linesize[0];
 317                 }
 318             }
 319             break;
 320
 321         case FLI_LC:
 322             /* line compressed */
 323             starting_line = bytestream2_get_le16(&g2);
 324             y_ptr = 0;
 325             y_ptr += starting_line * s->frame->linesize[0];
 326
 327             compressed_lines = bytestream2_get_le16(&g2);
 328             while (compressed_lines > 0) {
 329                 pixel_ptr = y_ptr;
 330                 CHECK_PIXEL_PTR(0);
 331                 pixel_countdown = s->avctx->width;
 332                 if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
 333                     break;
 334                 line_packets = bytestream2_get_byte(&g2);
 335                 if (line_packets > 0) {
 336                     for (i = 0; i < line_packets; i++) {
 337                         /* account for the skip bytes */
 338                         if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
 339                             break;
 340                         pixel_skip = bytestream2_get_byte(&g2);
 341                         pixel_ptr += pixel_skip;
 342                         pixel_countdown -= pixel_skip;
 343                         byte_run = sign_extend(bytestream2_get_byte(&g2),8);
 344                         if (byte_run > 0) {
 345                             CHECK_PIXEL_PTR(byte_run);
 346                             if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
 347                                 break;
 348                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 349                                 pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
 350                             }
 351                         } else if (byte_run < 0) {
 352                             byte_run = -byte_run;
 353                             palette_idx1 = bytestream2_get_byte(&g2);
 354                             CHECK_PIXEL_PTR(byte_run);
 355                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 356                                 pixels[pixel_ptr++] = palette_idx1;
 357                             }
 358                         }
 359                     }
 360                 }
 361
 362                 y_ptr += s->frame->linesize[0];
 363                 compressed_lines--;
 364             }
 365             break;
 366
 367         case FLI_BLACK:
 368             /* set the whole frame to color 0 (which is usually black) */
 369             memset(pixels, 0,
 370                 s->frame->linesize[0] * s->avctx->height);
 371             break;
 372
 373         case FLI_BRUN:
 374             /* Byte run compression: This chunk type only occurs in the first
 375              * FLI frame and it will update the entire frame. */
 376             y_ptr = 0;
 377             for (lines = 0; lines < s->avctx->height; lines++) {
 378                 pixel_ptr = y_ptr;
 379                 /* disregard the line packets; instead, iterate through all
 380                  * pixels on a row */
 381                  bytestream2_skip(&g2, 1);
 382                 pixel_countdown = s->avctx->width;
 383                 while (pixel_countdown > 0) {
 384                     if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
 385                         break;
 386                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 387                     if (!byte_run) {
 388                         av_log(avctx, AV_LOG_ERROR, "Invalid byte run value.\n");
 389                         return AVERROR_INVALIDDATA;
 390                     }
 391
 392                     if (byte_run > 0) {
 393                         palette_idx1 = bytestream2_get_byte(&g2);
 394                         CHECK_PIXEL_PTR(byte_run);
 395                         for (j = 0; j < byte_run; j++) {
 396                             pixels[pixel_ptr++] = palette_idx1;
 397                             pixel_countdown--;
 398                             if (pixel_countdown < 0)
 399                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 400                                        pixel_countdown, lines);
 401                         }
 402                     } else {  /* copy bytes if byte_run < 0 */
 403                         byte_run = -byte_run;
 404                         CHECK_PIXEL_PTR(byte_run);
 405                         if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
 406                             break;
 407                         for (j = 0; j < byte_run; j++) {
 408                             pixels[pixel_ptr++] = bytestream2_get_byte(&g2);
 409                             pixel_countdown--;
 410                             if (pixel_countdown < 0)
 411                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 412                                        pixel_countdown, lines);
 413                         }
 414                     }
 415                 }
 416
 417                 y_ptr += s->frame->linesize[0];
 418             }
 419             break;
 420
 421         case FLI_COPY:
 422             /* copy the chunk (uncompressed frame) */
 423             if (chunk_size - 6 != FFALIGN(s->avctx->width, 4) * s->avctx->height) {
 424                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
 425                        "has incorrect size, skipping chunk\n", chunk_size - 6);
 426                 bytestream2_skip(&g2, chunk_size - 6);
 427             } else {
 428                 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;
 429                      y_ptr += s->frame->linesize[0]) {
 430                     bytestream2_get_buffer(&g2, &pixels[y_ptr],
 431                                            s->avctx->width);
 432                     if (s->avctx->width & 3)
 433                         bytestream2_skip(&g2, 4 - (s->avctx->width & 3));
 434                 }
 435             }
 436             break;
 437
 438         case FLI_MINI:
 439             /* some sort of a thumbnail? disregard this chunk... */
 440             break;
 441
 442         default:
 443             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
 444             break;
 445         }
 446
 447         if (stream_ptr_after_chunk - bytestream2_tell(&g2) > 0)
 448             bytestream2_skip(&g2, stream_ptr_after_chunk - bytestream2_tell(&g2));
 449
 450         frame_size -= chunk_size;
 451         num_chunks--;
 452     }
 453
 454     /* by the end of the chunk, the stream ptr should equal the frame
 455      * size (minus 1 or 2, possibly); if it doesn't, issue a warning */
 456     if (bytestream2_get_bytes_left(&g2) > 2)
 457         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
 458                "and final chunk ptr = %d\n", buf_size,
 459                buf_size - bytestream2_get_bytes_left(&g2));
 460
 461     /* make the palette available on the way out */
 462     memcpy(s->frame->data[1], s->palette, AVPALETTE_SIZE);
 463     if (s->new_palette) {
 464         s->frame->palette_has_changed = 1;
 465         s->new_palette = 0;
 466     }
 467
 468     if ((ret = av_frame_ref(data, s->frame)) < 0)
 469         return ret;
 470
 471     *got_frame = 1;
 472
 473     return buf_size;
 474 }
 475
 476 static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
 477                                       void *data, int *got_frame,
 478                                       const uint8_t *buf, int buf_size)
 479 {
 480     /* Note, the only difference between the 15Bpp and 16Bpp */
 481     /* Format is the pixel format, the packets are processed the same. */
 482     FlicDecodeContext *s = avctx->priv_data;
 483
 484     GetByteContext g2;
 485     int pixel_ptr;
 486     unsigned char palette_idx1;
 487
 488     unsigned int frame_size;
 489     int num_chunks;
 490
 491     unsigned int chunk_size;
 492     int chunk_type;
 493
 494     int i, j, ret;
 495
 496     int lines;
 497     int compressed_lines;
 498     signed short line_packets;
 499     int y_ptr;
 500     int byte_run;
 501     int pixel_skip;
 502     int pixel_countdown;
 503     unsigned char *pixels;
 504     int pixel;
 505     unsigned int pixel_limit;
 506
 507     bytestream2_init(&g2, buf, buf_size);
 508
 509     if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
 510         return ret;
 511
 512     pixels = s->frame->data[0];
 513     pixel_limit = s->avctx->height * s->frame->linesize[0];
 514
 515     frame_size = bytestream2_get_le32(&g2);
 516     bytestream2_skip(&g2, 2);  /* skip the magic number */
 517     num_chunks = bytestream2_get_le16(&g2);
 518     bytestream2_skip(&g2, 8);  /* skip padding */
 519     if (frame_size > buf_size)
 520         frame_size = buf_size;
 521
 522     frame_size -= 16;
 523
 524     /* iterate through the chunks */
 525     while ((frame_size > 0) && (num_chunks > 0) &&
 526             bytestream2_get_bytes_left(&g2) >= 4) {
 527         int stream_ptr_after_chunk;
 528         chunk_size = bytestream2_get_le32(&g2);
 529         if (chunk_size > frame_size) {
 530             av_log(avctx, AV_LOG_WARNING,
 531                    "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);
 532             chunk_size = frame_size;
 533         }
 534         stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
 535
 536         chunk_type = bytestream2_get_le16(&g2);
 537
 538
 539         switch (chunk_type) {
 540         case FLI_256_COLOR:
 541         case FLI_COLOR:
 542             /* For some reason, it seems that non-palettized flics do
 543              * include one of these chunks in their first frame.
 544              * Why I do not know, it seems rather extraneous. */
 545             ff_dlog(avctx,
 546                     "Unexpected Palette chunk %d in non-palettized FLC\n",
 547                     chunk_type);
 548             bytestream2_skip(&g2, chunk_size - 6);
 549             break;
 550
 551         case FLI_DELTA:
 552         case FLI_DTA_LC:
 553             y_ptr = 0;
 554             compressed_lines = bytestream2_get_le16(&g2);
 555             while (compressed_lines > 0) {
 556                 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
 557                     break;
 558                 line_packets = bytestream2_get_le16(&g2);
 559                 if (line_packets < 0) {
 560                     line_packets = -line_packets;
 561                     y_ptr += line_packets * s->frame->linesize[0];
 562                 } else {
 563                     compressed_lines--;
 564                     pixel_ptr = y_ptr;
 565                     CHECK_PIXEL_PTR(0);
 566                     pixel_countdown = s->avctx->width;
 567                     for (i = 0; i < line_packets; i++) {
 568                         /* account for the skip bytes */
 569                         if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
 570                             break;
 571                         pixel_skip = bytestream2_get_byte(&g2);
 572                         pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
 573                         pixel_countdown -= pixel_skip;
 574                         byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 575                         if (byte_run < 0) {
 576                             byte_run = -byte_run;
 577                             pixel    = bytestream2_get_le16(&g2);
 578                             CHECK_PIXEL_PTR(2 * byte_run);
 579                             for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
 580                                 *((signed short*)(&pixels[pixel_ptr])) = pixel;
 581                                 pixel_ptr += 2;
 582                             }
 583                         } else {
 584                             if (bytestream2_tell(&g2) + 2*byte_run > stream_ptr_after_chunk)
 585                                 break;
 586                             CHECK_PIXEL_PTR(2 * byte_run);
 587                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 588                                 *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
 589                                 pixel_ptr += 2;
 590                             }
 591                         }
 592                     }
 593
 594                     y_ptr += s->frame->linesize[0];
 595                 }
 596             }
 597             break;
 598
 599         case FLI_LC:
 600             av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-palettized FLC\n");
 601             bytestream2_skip(&g2, chunk_size - 6);
 602             break;
 603
 604         case FLI_BLACK:
 605             /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */
 606             memset(pixels, 0x0000,
 607                    s->frame->linesize[0] * s->avctx->height);
 608             break;
 609
 610         case FLI_BRUN:
 611             y_ptr = 0;
 612             for (lines = 0; lines < s->avctx->height; lines++) {
 613                 pixel_ptr = y_ptr;
 614                 /* disregard the line packets; instead, iterate through all
 615                  * pixels on a row */
 616                 bytestream2_skip(&g2, 1);
 617                 pixel_countdown = (s->avctx->width * 2);
 618
 619                 while (pixel_countdown > 0) {
 620                     if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
 621                         break;
 622                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 623                     if (byte_run > 0) {
 624                         palette_idx1 = bytestream2_get_byte(&g2);
 625                         CHECK_PIXEL_PTR(byte_run);
 626                         for (j = 0; j < byte_run; j++) {
 627                             pixels[pixel_ptr++] = palette_idx1;
 628                             pixel_countdown--;
 629                             if (pixel_countdown < 0)
 630                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
 631                                        pixel_countdown, lines);
 632                         }
 633                     } else {  /* copy bytes if byte_run < 0 */
 634                         byte_run = -byte_run;
 635                         if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
 636                             break;
 637                         CHECK_PIXEL_PTR(byte_run);
 638                         for (j = 0; j < byte_run; j++) {
 639                             palette_idx1 = bytestream2_get_byte(&g2);
 640                             pixels[pixel_ptr++] = palette_idx1;
 641                             pixel_countdown--;
 642                             if (pixel_countdown < 0)
 643                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 644                                        pixel_countdown, lines);
 645                         }
 646                     }
 647                 }
 648
 649                 /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
 650                  * This does not give us any good opportunity to perform word endian conversion
 651                  * during decompression. So if it is required (i.e., this is not a LE target, we do
 652                  * a second pass over the line here, swapping the bytes.
 653                  */
 654 #if HAVE_BIGENDIAN
 655                 pixel_ptr = y_ptr;
 656                 pixel_countdown = s->avctx->width;
 657                 while (pixel_countdown > 0) {
 658                     *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]);
 659                     pixel_ptr += 2;
 660                 }
 661 #endif
 662                 y_ptr += s->frame->linesize[0];
 663             }
 664             break;
 665
 666         case FLI_DTA_BRUN:
 667             y_ptr = 0;
 668             for (lines = 0; lines < s->avctx->height; lines++) {
 669                 pixel_ptr = y_ptr;
 670                 /* disregard the line packets; instead, iterate through all
 671                  * pixels on a row */
 672                 bytestream2_skip(&g2, 1);
 673                 pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
 674
 675                 while (pixel_countdown > 0) {
 676                     if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
 677                         break;
 678                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 679                     if (byte_run > 0) {
 680                         pixel    = bytestream2_get_le16(&g2);
 681                         CHECK_PIXEL_PTR(2 * byte_run);
 682                         for (j = 0; j < byte_run; j++) {
 683                             *((signed short*)(&pixels[pixel_ptr])) = pixel;
 684                             pixel_ptr += 2;
 685                             pixel_countdown--;
 686                             if (pixel_countdown < 0)
 687                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 688                                        pixel_countdown);
 689                         }
 690                     } else {  /* copy pixels if byte_run < 0 */
 691                         byte_run = -byte_run;
 692                         if (bytestream2_tell(&g2) + 2 * byte_run > stream_ptr_after_chunk)
 693                             break;
 694                         CHECK_PIXEL_PTR(2 * byte_run);
 695                         for (j = 0; j < byte_run; j++) {
 696                             *((signed short*)(&pixels[pixel_ptr])) = bytestream2_get_le16(&g2);
 697                             pixel_ptr  += 2;
 698                             pixel_countdown--;
 699                             if (pixel_countdown < 0)
 700                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 701                                        pixel_countdown);
 702                         }
 703                     }
 704                 }
 705
 706                 y_ptr += s->frame->linesize[0];
 707             }
 708             break;
 709
 710         case FLI_COPY:
 711         case FLI_DTA_COPY:
 712             /* copy the chunk (uncompressed frame) */
 713             if (chunk_size - 6 > (unsigned int)(FFALIGN(s->avctx->width, 2) * s->avctx->height)*2) {
 714                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
 715                        "bigger than image, skipping chunk\n", chunk_size - 6);
 716                 bytestream2_skip(&g2, chunk_size - 6);
 717             } else {
 718
 719                 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;
 720                      y_ptr += s->frame->linesize[0]) {
 721
 722                     pixel_countdown = s->avctx->width;
 723                     pixel_ptr = 0;
 724                     while (pixel_countdown > 0) {
 725                       *((signed short*)(&pixels[y_ptr + pixel_ptr])) = bytestream2_get_le16(&g2);
 726                       pixel_ptr += 2;
 727                       pixel_countdown--;
 728                     }
 729                     if (s->avctx->width & 1)
 730                         bytestream2_skip(&g2, 2);
 731                 }
 732             }
 733             break;
 734
 735         case FLI_MINI:
 736             /* some sort of a thumbnail? disregard this chunk... */
 737             bytestream2_skip(&g2, chunk_size - 6);
 738             break;
 739
 740         default:
 741             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
 742             break;
 743         }
 744
 745         frame_size -= chunk_size;
 746         num_chunks--;
 747     }
 748
 749     /* by the end of the chunk, the stream ptr should equal the frame
 750      * size (minus 1, possibly); if it doesn't, issue a warning */
 751     if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1))
 752         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
 753                "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2));
 754
 755     if ((ret = av_frame_ref(data, s->frame)) < 0)
 756         return ret;
 757
 758     *got_frame = 1;
 759
 760     return buf_size;
 761 }
 762
 763 static int flic_decode_frame_24BPP(AVCodecContext *avctx,
 764                                    void *data, int *got_frame,
 765                                    const uint8_t *buf, int buf_size)
 766 {
 767     FlicDecodeContext *s = avctx->priv_data;
 768
 769     GetByteContext g2;
 770     int pixel_ptr;
 771     unsigned char palette_idx1;
 772
 773     unsigned int frame_size;
 774     int num_chunks;
 775
 776     unsigned int chunk_size;
 777     int chunk_type;
 778
 779     int i, j, ret;
 780
 781     int lines;
 782     int compressed_lines;
 783     signed short line_packets;
 784     int y_ptr;
 785     int byte_run;
 786     int pixel_skip;
 787     int pixel_countdown;
 788     unsigned char *pixels;
 789     int pixel;
 790     unsigned int pixel_limit;
 791
 792     bytestream2_init(&g2, buf, buf_size);
 793
 794     if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
 795         return ret;
 796
 797     pixels = s->frame->data[0];
 798     pixel_limit = s->avctx->height * s->frame->linesize[0];
 799
 800     frame_size = bytestream2_get_le32(&g2);
 801     bytestream2_skip(&g2, 2);  /* skip the magic number */
 802     num_chunks = bytestream2_get_le16(&g2);
 803     bytestream2_skip(&g2, 8);  /* skip padding */
 804     if (frame_size > buf_size)
 805         frame_size = buf_size;
 806
 807     frame_size -= 16;
 808
 809     /* iterate through the chunks */
 810     while ((frame_size > 0) && (num_chunks > 0) &&
 811             bytestream2_get_bytes_left(&g2) >= 4) {
 812         int stream_ptr_after_chunk;
 813         chunk_size = bytestream2_get_le32(&g2);
 814         if (chunk_size > frame_size) {
 815             av_log(avctx, AV_LOG_WARNING,
 816                    "Invalid chunk_size = %u > frame_size = %u\n", chunk_size, frame_size);
 817             chunk_size = frame_size;
 818         }
 819         stream_ptr_after_chunk = bytestream2_tell(&g2) - 4 + chunk_size;
 820
 821         chunk_type = bytestream2_get_le16(&g2);
 822
 823
 824         switch (chunk_type) {
 825         case FLI_256_COLOR:
 826         case FLI_COLOR:
 827             /* For some reason, it seems that non-palettized flics do
 828              * include one of these chunks in their first frame.
 829              * Why I do not know, it seems rather extraneous. */
 830             ff_dlog(avctx,
 831                     "Unexpected Palette chunk %d in non-palettized FLC\n",
 832                     chunk_type);
 833             bytestream2_skip(&g2, chunk_size - 6);
 834             break;
 835
 836         case FLI_DELTA:
 837         case FLI_DTA_LC:
 838             y_ptr = 0;
 839             compressed_lines = bytestream2_get_le16(&g2);
 840             while (compressed_lines > 0) {
 841                 if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
 842                     break;
 843                 line_packets = bytestream2_get_le16(&g2);
 844                 if (line_packets < 0) {
 845                     line_packets = -line_packets;
 846                     y_ptr += line_packets * s->frame->linesize[0];
 847                 } else {
 848                     compressed_lines--;
 849                     pixel_ptr = y_ptr;
 850                     CHECK_PIXEL_PTR(0);
 851                     pixel_countdown = s->avctx->width;
 852                     for (i = 0; i < line_packets; i++) {
 853                         /* account for the skip bytes */
 854                         if (bytestream2_tell(&g2) + 2 > stream_ptr_after_chunk)
 855                             break;
 856                         pixel_skip = bytestream2_get_byte(&g2);
 857                         pixel_ptr += (pixel_skip*3); /* Pixel is 3 bytes wide */
 858                         pixel_countdown -= pixel_skip;
 859                         byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 860                         if (byte_run < 0) {
 861                             byte_run = -byte_run;
 862                             pixel    = bytestream2_get_le24(&g2);
 863                             CHECK_PIXEL_PTR(3 * byte_run);
 864                             for (j = 0; j < byte_run; j++, pixel_countdown -= 1) {
 865                                 AV_WL24(&pixels[pixel_ptr], pixel);
 866                                 pixel_ptr += 3;
 867                             }
 868                         } else {
 869                             if (bytestream2_tell(&g2) + 2*byte_run > stream_ptr_after_chunk)
 870                                 break;
 871                             CHECK_PIXEL_PTR(2 * byte_run);
 872                             for (j = 0; j < byte_run; j++, pixel_countdown--) {
 873                                 pixel = bytestream2_get_le24(&g2);
 874                                 AV_WL24(&pixels[pixel_ptr], pixel);
 875                                 pixel_ptr += 3;
 876                             }
 877                         }
 878                     }
 879
 880                     y_ptr += s->frame->linesize[0];
 881                 }
 882             }
 883             break;
 884
 885         case FLI_LC:
 886             av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-palettized FLC\n");
 887             bytestream2_skip(&g2, chunk_size - 6);
 888             break;
 889
 890         case FLI_BLACK:
 891             /* set the whole frame to 0x00 which is black for 24 bit mode. */
 892             memset(pixels, 0x00,
 893                    s->frame->linesize[0] * s->avctx->height);
 894             break;
 895
 896         case FLI_BRUN:
 897             y_ptr = 0;
 898             for (lines = 0; lines < s->avctx->height; lines++) {
 899                 pixel_ptr = y_ptr;
 900                 /* disregard the line packets; instead, iterate through all
 901                  * pixels on a row */
 902                 bytestream2_skip(&g2, 1);
 903                 pixel_countdown = (s->avctx->width * 3);
 904
 905                 while (pixel_countdown > 0) {
 906                     if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
 907                         break;
 908                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 909                     if (byte_run > 0) {
 910                         palette_idx1 = bytestream2_get_byte(&g2);
 911                         CHECK_PIXEL_PTR(byte_run);
 912                         for (j = 0; j < byte_run; j++) {
 913                             pixels[pixel_ptr++] = palette_idx1;
 914                             pixel_countdown--;
 915                             if (pixel_countdown < 0)
 916                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
 917                                        pixel_countdown, lines);
 918                         }
 919                     } else {  /* copy bytes if byte_run < 0 */
 920                         byte_run = -byte_run;
 921                         if (bytestream2_tell(&g2) + byte_run > stream_ptr_after_chunk)
 922                             break;
 923                         CHECK_PIXEL_PTR(byte_run);
 924                         for (j = 0; j < byte_run; j++) {
 925                             palette_idx1 = bytestream2_get_byte(&g2);
 926                             pixels[pixel_ptr++] = palette_idx1;
 927                             pixel_countdown--;
 928                             if (pixel_countdown < 0)
 929                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
 930                                        pixel_countdown, lines);
 931                         }
 932                     }
 933                 }
 934
 935                 y_ptr += s->frame->linesize[0];
 936             }
 937             break;
 938
 939         case FLI_DTA_BRUN:
 940             y_ptr = 0;
 941             for (lines = 0; lines < s->avctx->height; lines++) {
 942                 pixel_ptr = y_ptr;
 943                 /* disregard the line packets; instead, iterate through all
 944                  * pixels on a row */
 945                 bytestream2_skip(&g2, 1);
 946                 pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
 947
 948                 while (pixel_countdown > 0) {
 949                     if (bytestream2_tell(&g2) + 1 > stream_ptr_after_chunk)
 950                         break;
 951                     byte_run = sign_extend(bytestream2_get_byte(&g2), 8);
 952                     if (byte_run > 0) {
 953                         pixel = bytestream2_get_le24(&g2);
 954                         CHECK_PIXEL_PTR(3 * byte_run);
 955                         for (j = 0; j < byte_run; j++) {
 956                             AV_WL24(pixels + pixel_ptr, pixel);
 957                             pixel_ptr += 3;
 958                             pixel_countdown--;
 959                             if (pixel_countdown < 0)
 960                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 961                                        pixel_countdown);
 962                         }
 963                     } else {  /* copy pixels if byte_run < 0 */
 964                         byte_run = -byte_run;
 965                         if (bytestream2_tell(&g2) + 3 * byte_run > stream_ptr_after_chunk)
 966                             break;
 967                         CHECK_PIXEL_PTR(3 * byte_run);
 968                         for (j = 0; j < byte_run; j++) {
 969                             pixel = bytestream2_get_le24(&g2);
 970                             AV_WL24(pixels + pixel_ptr, pixel);
 971                             pixel_ptr  += 3;
 972                             pixel_countdown--;
 973                             if (pixel_countdown < 0)
 974                                 av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
 975                                        pixel_countdown);
 976                         }
 977                     }
 978                 }
 979
 980                 y_ptr += s->frame->linesize[0];
 981             }
 982             break;
 983
 984         case FLI_COPY:
 985         case FLI_DTA_COPY:
 986             /* copy the chunk (uncompressed frame) */
 987             if (chunk_size - 6 > (unsigned int)(FFALIGN(s->avctx->width, 2) * s->avctx->height)*3) {
 988                 av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
 989                        "bigger than image, skipping chunk\n", chunk_size - 6);
 990                 bytestream2_skip(&g2, chunk_size - 6);
 991             } else {
 992                 for (y_ptr = 0; y_ptr < s->frame->linesize[0] * s->avctx->height;
 993                      y_ptr += s->frame->linesize[0]) {
 994
 995                     pixel_countdown = s->avctx->width;
 996                     pixel_ptr = 0;
 997                     while (pixel_countdown > 0) {
 998                         pixel = bytestream2_get_le24(&g2);
 999                         AV_WL24(&pixels[y_ptr + pixel_ptr], pixel);
1000                         pixel_ptr += 3;
1001                         pixel_countdown--;
1002                     }
1003                     if (s->avctx->width & 1)
1004                         bytestream2_skip(&g2, 3);
1005                 }
1006             }
1007             break;
1008
1009         case FLI_MINI:
1010             /* some sort of a thumbnail? disregard this chunk... */
1011             bytestream2_skip(&g2, chunk_size - 6);
1012             break;
1013
1014         default:
1015             av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
1016             break;
1017         }
1018
1019         frame_size -= chunk_size;
1020         num_chunks--;
1021     }
1022
1023     /* by the end of the chunk, the stream ptr should equal the frame
1024      * size (minus 1, possibly); if it doesn't, issue a warning */
1025     if ((bytestream2_get_bytes_left(&g2) != 0) && (bytestream2_get_bytes_left(&g2) != 1))
1026         av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
1027                "and final chunk ptr = %d\n", buf_size, bytestream2_tell(&g2));
1028
1029     if ((ret = av_frame_ref(data, s->frame)) < 0)
1030         return ret;
1031
1032     *got_frame = 1;
1033
1034     return buf_size;
1035 }
1036
1037 static int flic_decode_frame(AVCodecContext *avctx,
1038                              void *data, int *got_frame,
1039                              AVPacket *avpkt)
1040 {
1041     const uint8_t *buf = avpkt->data;
1042     int buf_size = avpkt->size;
1043     if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
1044         return flic_decode_frame_8BPP(avctx, data, got_frame,
1045                                       buf, buf_size);
1046     } else if ((avctx->pix_fmt == AV_PIX_FMT_RGB555) ||
1047                (avctx->pix_fmt == AV_PIX_FMT_RGB565)) {
1048         return flic_decode_frame_15_16BPP(avctx, data, got_frame,
1049                                           buf, buf_size);
1050     } else if (avctx->pix_fmt == AV_PIX_FMT_BGR24) {
1051         return flic_decode_frame_24BPP(avctx, data, got_frame,
1052                                        buf, buf_size);
1053     }
1054
1055     /* Should not get  here, ever as the pix_fmt is processed */
1056     /* in flic_decode_init and the above if should deal with */
1057     /* the finite set of possibilities allowable by here. */
1058     /* But in case we do, just error out. */
1059     av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");
1060     return AVERROR_BUG;
1061 }
1062
1063
1064 static av_cold int flic_decode_end(AVCodecContext *avctx)
1065 {
1066     FlicDecodeContext *s = avctx->priv_data;
1067
1068     av_frame_free(&s->frame);
1069
1070     return 0;
1071 }
1072
1073 AVCodec ff_flic_decoder = {
1074     .name           = "flic",
1075     .long_name      = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"),
1076     .type           = AVMEDIA_TYPE_VIDEO,
1077     .id             = AV_CODEC_ID_FLIC,
1078     .priv_data_size = sizeof(FlicDecodeContext),
1079     .init           = flic_decode_init,
1080     .close          = flic_decode_end,
1081     .decode         = flic_decode_frame,
1082     .capabilities   = AV_CODEC_CAP_DR1,
1083 };