flicvideo.c 27.3 KB
Newer Older
Mike Melanson's avatar
Mike Melanson committed
1 2
/*
 * FLI/FLC Animation Video Decoder
3
 * Copyright (C) 2003, 2004 the ffmpeg project
Mike Melanson's avatar
Mike Melanson committed
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

/**
 * @file flic.c
 * Autodesk Animator FLI/FLC Video Decoder
 * by Mike Melanson (melanson@pcisys.net)
 * for more information on the .fli/.flc file format and all of its many
 * variations, visit:
 *   http://www.compuphase.com/flic.htm
 *
29 30
 * This decoder outputs PAL8/RGB555/RGB565 and maybe one day RGB24
 * colorspace data, depending on the FLC. To use this decoder, be
Mike Melanson's avatar
Mike Melanson committed
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
 * sure that your demuxer sends the FLI file header to the decoder via
 * the extradata chunk in AVCodecContext. The chunk should be 128 bytes
 * large. The only exception is for FLI files from the game "Magic Carpet",
 * in which the header is only 12 bytes.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "common.h"
#include "avcodec.h"
#include "bswap.h"

#define FLI_256_COLOR 4
#define FLI_DELTA     7
#define FLI_COLOR     11
#define FLI_LC        12
#define FLI_BLACK     13
#define FLI_BRUN      15
#define FLI_COPY      16
#define FLI_MINI      18
54 55 56 57 58 59 60 61
#define FLI_DTA_BRUN  25
#define FLI_DTA_COPY  26
#define FLI_DTA_LC    27

#define FLI_TYPE_CODE     (0xAF11)
#define FLC_FLX_TYPE_CODE (0xAF12)
#define FLC_DTA_TYPE_CODE (0xAF44) /* Marks an "Extended FLC" comes from Dave's Targa Animator (DTA) */
#define FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE (0xAF13)
Mike Melanson's avatar
Mike Melanson committed
62

63 64 65 66 67 68 69
#define CHECK_PIXEL_PTR(n) \
    if (pixel_ptr + n > pixel_limit) { \
        av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr >= pixel_limit (%d >= %d)\n", \
        pixel_ptr + n, pixel_limit); \
        return -1; \
    } \

Mike Melanson's avatar
Mike Melanson committed
70 71 72 73 74 75 76 77 78 79 80 81 82
typedef struct FlicDecodeContext {
    AVCodecContext *avctx;
    AVFrame frame;

    unsigned int palette[256];
    int new_palette;
    int fli_type;  /* either 0xAF11 or 0xAF12, affects palette resolution */
} FlicDecodeContext;

static int flic_decode_init(AVCodecContext *avctx)
{
    FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
    unsigned char *fli_header = (unsigned char *)avctx->extradata;
83
    int depth;
Mike Melanson's avatar
Mike Melanson committed
84 85 86 87

    s->avctx = avctx;
    avctx->has_b_frames = 0;

88 89
    s->fli_type = LE_16(&fli_header[4]); /* Might be overridden if a Magic Carpet FLC */
    depth       = LE_16(&fli_header[12]);
90

91 92 93 94
    if (depth == 0) {
      depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
    }

Mike Melanson's avatar
Mike Melanson committed
95 96
    if (s->avctx->extradata_size == 12) {
        /* special case for magic carpet FLIs */
97 98
        s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE;
    } else if (s->avctx->extradata_size != 128) {
99
        av_log(avctx, AV_LOG_ERROR, "Expected extradata of 12 or 128 bytes\n");
Mike Melanson's avatar
Mike Melanson committed
100 101 102
        return -1;
    }

103 104 105 106 107 108 109 110 111 112 113 114 115 116 117
    if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
        depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
    }

    switch (depth) {
        case 8  : avctx->pix_fmt = PIX_FMT_PAL8; break;
        case 15 : avctx->pix_fmt = PIX_FMT_RGB555; break;
        case 16 : avctx->pix_fmt = PIX_FMT_RGB565; break;
        case 24 : avctx->pix_fmt = PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */
                  av_log(avctx, AV_LOG_ERROR, "24Bpp FLC/FLX is unsupported due to no test files.\n");
                  return -1;
                  break;
        default :
                  av_log(avctx, AV_LOG_ERROR, "Unkown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
                  return -1;
118
    }
119

120
    s->frame.data[0] = NULL;
Mike Melanson's avatar
Mike Melanson committed
121 122 123 124 125
    s->new_palette = 0;

    return 0;
}

126 127 128
static int flic_decode_frame_8BPP(AVCodecContext *avctx,
                                  void *data, int *data_size,
                                  uint8_t *buf, int buf_size)
Mike Melanson's avatar
Mike Melanson committed
129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160
{
    FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;

    int stream_ptr = 0;
    int stream_ptr_after_color_chunk;
    int pixel_ptr;
    int palette_ptr;
    unsigned char palette_idx1;
    unsigned char palette_idx2;

    unsigned int frame_size;
    int num_chunks;

    unsigned int chunk_size;
    int chunk_type;

    int i, j;

    int color_packets;
    int color_changes;
    int color_shift;
    unsigned char r, g, b;

    int lines;
    int compressed_lines;
    int starting_line;
    signed short line_packets;
    int y_ptr;
    signed char byte_run;
    int pixel_skip;
    int pixel_countdown;
    unsigned char *pixels;
161
    int pixel_limit;
162

Mike Melanson's avatar
Mike Melanson committed
163
    s->frame.reference = 1;
164 165 166
    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
    if (avctx->reget_buffer(avctx, &s->frame) < 0) {
        av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
Mike Melanson's avatar
Mike Melanson committed
167 168 169 170
        return -1;
    }

    pixels = s->frame.data[0];
171
    pixel_limit = s->avctx->height * s->frame.linesize[0];
Mike Melanson's avatar
Mike Melanson committed
172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192

    frame_size = LE_32(&buf[stream_ptr]);
    stream_ptr += 6;  /* skip the magic number */
    num_chunks = LE_16(&buf[stream_ptr]);
    stream_ptr += 10;  /* skip padding */

    frame_size -= 16;

    /* iterate through the chunks */
    while ((frame_size > 0) && (num_chunks > 0)) {
        chunk_size = LE_32(&buf[stream_ptr]);
        stream_ptr += 4;
        chunk_type = LE_16(&buf[stream_ptr]);
        stream_ptr += 2;

        switch (chunk_type) {
        case FLI_256_COLOR:
        case FLI_COLOR:
            stream_ptr_after_color_chunk = stream_ptr + chunk_size - 6;
            s->new_palette = 1;

193 194
            /* check special case: If this file is from the Magic Carpet
             * game and uses 6-bit colors even though it reports 256-color
Mike Melanson's avatar
Mike Melanson committed
195 196
             * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
             * initialization) */
197
            if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
Mike Melanson's avatar
Mike Melanson committed
198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218
                color_shift = 0;
            else
                color_shift = 2;
            /* set up the palette */
            color_packets = LE_16(&buf[stream_ptr]);
            stream_ptr += 2;
            palette_ptr = 0;
            for (i = 0; i < color_packets; i++) {
                /* first byte is how many colors to skip */
                palette_ptr += buf[stream_ptr++];

                /* next byte indicates how many entries to change */
                color_changes = buf[stream_ptr++];

                /* if there are 0 color changes, there are actually 256 */
                if (color_changes == 0)
                    color_changes = 256;

                for (j = 0; j < color_changes; j++) {

                    /* wrap around, for good measure */
219
                    if ((unsigned)palette_ptr >= 256)
Mike Melanson's avatar
Mike Melanson committed
220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245
                        palette_ptr = 0;

                    r = buf[stream_ptr++] << color_shift;
                    g = buf[stream_ptr++] << color_shift;
                    b = buf[stream_ptr++] << color_shift;
                    s->palette[palette_ptr++] = (r << 16) | (g << 8) | b;
                }
            }

            /* color chunks sometimes have weird 16-bit alignment issues;
             * therefore, take the hardline approach and set the stream_ptr
             * to the value calculated w.r.t. the size specified by the color
             * chunk header */
            stream_ptr = stream_ptr_after_color_chunk;

            break;

        case FLI_DELTA:
            y_ptr = 0;
            compressed_lines = LE_16(&buf[stream_ptr]);
            stream_ptr += 2;
            while (compressed_lines > 0) {
                line_packets = LE_16(&buf[stream_ptr]);
                stream_ptr += 2;
                if (line_packets < 0) {
                    line_packets = -line_packets;
246
                    y_ptr += line_packets * s->frame.linesize[0];
Mike Melanson's avatar
Mike Melanson committed
247 248 249 250 251 252 253 254 255 256 257 258 259 260
                } else {
                    compressed_lines--;
                    pixel_ptr = y_ptr;
                    pixel_countdown = s->avctx->width;
                    for (i = 0; i < line_packets; i++) {
                        /* account for the skip bytes */
                        pixel_skip = buf[stream_ptr++];
                        pixel_ptr += pixel_skip;
                        pixel_countdown -= pixel_skip;
                        byte_run = buf[stream_ptr++];
                        if (byte_run < 0) {
                            byte_run = -byte_run;
                            palette_idx1 = buf[stream_ptr++];
                            palette_idx2 = buf[stream_ptr++];
261
                            CHECK_PIXEL_PTR(byte_run);
Mike Melanson's avatar
Mike Melanson committed
262 263 264 265 266
                            for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
                                pixels[pixel_ptr++] = palette_idx1;
                                pixels[pixel_ptr++] = palette_idx2;
                            }
                        } else {
267
                            CHECK_PIXEL_PTR(byte_run * 2);
Mike Melanson's avatar
Mike Melanson committed
268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284
                            for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
                                palette_idx1 = buf[stream_ptr++];
                                pixels[pixel_ptr++] = palette_idx1;
                            }
                        }
                    }

                    y_ptr += s->frame.linesize[0];
                }
            }
            break;

        case FLI_LC:
            /* line compressed */
            starting_line = LE_16(&buf[stream_ptr]);
            stream_ptr += 2;
            y_ptr = 0;
285
            y_ptr += starting_line * s->frame.linesize[0];
Mike Melanson's avatar
Mike Melanson committed
286 287 288 289 290 291 292 293 294 295 296 297 298 299 300

            compressed_lines = LE_16(&buf[stream_ptr]);
            stream_ptr += 2;
            while (compressed_lines > 0) {
                pixel_ptr = y_ptr;
                pixel_countdown = s->avctx->width;
                line_packets = buf[stream_ptr++];
                if (line_packets > 0) {
                    for (i = 0; i < line_packets; i++) {
                        /* account for the skip bytes */
                        pixel_skip = buf[stream_ptr++];
                        pixel_ptr += pixel_skip;
                        pixel_countdown -= pixel_skip;
                        byte_run = buf[stream_ptr++];
                        if (byte_run > 0) {
301
                            CHECK_PIXEL_PTR(byte_run);
Mike Melanson's avatar
Mike Melanson committed
302 303 304 305 306 307 308
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
                                palette_idx1 = buf[stream_ptr++];
                                pixels[pixel_ptr++] = palette_idx1;
                            }
                        } else {
                            byte_run = -byte_run;
                            palette_idx1 = buf[stream_ptr++];
309
                            CHECK_PIXEL_PTR(byte_run);
Mike Melanson's avatar
Mike Melanson committed
310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
                                pixels[pixel_ptr++] = palette_idx1;
                            }
                        }
                    }
                }

                y_ptr += s->frame.linesize[0];
                compressed_lines--;
            }
            break;

        case FLI_BLACK:
            /* set the whole frame to color 0 (which is usually black) */
            memset(pixels, 0,
                s->frame.linesize[0] * s->avctx->height);
            break;

        case FLI_BRUN:
            /* Byte run compression: This chunk type only occurs in the first
             * FLI frame and it will update the entire frame. */
            y_ptr = 0;
            for (lines = 0; lines < s->avctx->height; lines++) {
                pixel_ptr = y_ptr;
                /* disregard the line packets; instead, iterate through all
                 * pixels on a row */
                stream_ptr++;
                pixel_countdown = s->avctx->width;
                while (pixel_countdown > 0) {
                    byte_run = buf[stream_ptr++];
                    if (byte_run > 0) {
                        palette_idx1 = buf[stream_ptr++];
342
                        CHECK_PIXEL_PTR(byte_run);
Mike Melanson's avatar
Mike Melanson committed
343 344 345 346
                        for (j = 0; j < byte_run; j++) {
                            pixels[pixel_ptr++] = palette_idx1;
                            pixel_countdown--;
                            if (pixel_countdown < 0)
347 348
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
                                       pixel_countdown);
Mike Melanson's avatar
Mike Melanson committed
349 350 351
                        }
                    } else {  /* copy bytes if byte_run < 0 */
                        byte_run = -byte_run;
352
                        CHECK_PIXEL_PTR(byte_run);
Mike Melanson's avatar
Mike Melanson committed
353 354 355 356 357
                        for (j = 0; j < byte_run; j++) {
                            palette_idx1 = buf[stream_ptr++];
                            pixels[pixel_ptr++] = palette_idx1;
                            pixel_countdown--;
                            if (pixel_countdown < 0)
358 359
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
                                       pixel_countdown);
Mike Melanson's avatar
Mike Melanson committed
360 361 362 363 364 365 366 367 368
                        }
                    }
                }

                y_ptr += s->frame.linesize[0];
            }
            break;

        case FLI_COPY:
369
            /* copy the chunk (uncompressed frame) */
Mike Melanson's avatar
Mike Melanson committed
370
            if (chunk_size - 6 > s->avctx->width * s->avctx->height) {
371 372
                av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
                       "bigger than image, skipping chunk\n", chunk_size - 6);
Mike Melanson's avatar
Mike Melanson committed
373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389
                stream_ptr += chunk_size - 6;
            } else {
                for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
                     y_ptr += s->frame.linesize[0]) {
                    memcpy(&pixels[y_ptr], &buf[stream_ptr],
                        s->avctx->width);
                    stream_ptr += s->avctx->width;
                }
            }
            break;

        case FLI_MINI:
            /* some sort of a thumbnail? disregard this chunk... */
            stream_ptr += chunk_size - 6;
            break;

        default:
390
            av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
Mike Melanson's avatar
Mike Melanson committed
391 392 393 394 395 396 397 398 399 400
            break;
        }

        frame_size -= chunk_size;
        num_chunks--;
    }

    /* by the end of the chunk, the stream ptr should equal the frame
     * size (minus 1, possibly); if it doesn't, issue a warning */
    if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
401 402
        av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
               "and final chunk ptr = %d\n", buf_size, stream_ptr);
Mike Melanson's avatar
Mike Melanson committed
403 404 405 406 407 408 409 410 411 412 413 414 415 416 417

    /* make the palette available on the way out */
//    if (s->new_palette) {
    if (1) {
        memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
        s->frame.palette_has_changed = 1;
        s->new_palette = 0;
    }

    *data_size=sizeof(AVFrame);
    *(AVFrame*)data = s->frame;

    return buf_size;
}

418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545
int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
                                      void *data, int *data_size,
                                      uint8_t *buf, int buf_size)
{
    /* Note, the only difference between the 15Bpp and 16Bpp */
    /* Format is the pixel format, the packets are processed the same. */
    FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;

    int stream_ptr = 0;
    int pixel_ptr;
    unsigned char palette_idx1;

    unsigned int frame_size;
    int num_chunks;

    unsigned int chunk_size;
    int chunk_type;

    int i, j;

    int lines;
    int compressed_lines;
    signed short line_packets;
    int y_ptr;
    signed char byte_run;
    int pixel_skip;
    int pixel_countdown;
    unsigned char *pixels;
    int pixel;
    int pixel_limit;

    s->frame.reference = 1;
    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
    if (avctx->reget_buffer(avctx, &s->frame) < 0) {
        av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
        return -1;
    }

    pixels = s->frame.data[0];
    pixel_limit = s->avctx->height * s->frame.linesize[0];

    frame_size = LE_32(&buf[stream_ptr]);
    stream_ptr += 6;  /* skip the magic number */
    num_chunks = LE_16(&buf[stream_ptr]);
    stream_ptr += 10;  /* skip padding */

    frame_size -= 16;

    /* iterate through the chunks */
    while ((frame_size > 0) && (num_chunks > 0)) {
        chunk_size = LE_32(&buf[stream_ptr]);
        stream_ptr += 4;
        chunk_type = LE_16(&buf[stream_ptr]);
        stream_ptr += 2;

        switch (chunk_type) {
        case FLI_256_COLOR:
        case FLI_COLOR:
            /* For some reason, it seems that non-paletised flics do include one of these */
            /* chunks in their first frame.  Why i do not know, it seems rather extraneous */
/*            av_log(avctx, AV_LOG_ERROR, "Unexpected Palette chunk %d in non-paletised FLC\n",chunk_type);*/
            stream_ptr = stream_ptr + chunk_size - 6;
            break;

        case FLI_DELTA:
        case FLI_DTA_LC:
            y_ptr = 0;
            compressed_lines = LE_16(&buf[stream_ptr]);
            stream_ptr += 2;
            while (compressed_lines > 0) {
                line_packets = LE_16(&buf[stream_ptr]);
                stream_ptr += 2;
                if (line_packets < 0) {
                    line_packets = -line_packets;
                    y_ptr += line_packets * s->frame.linesize[0];
                } else {
                    compressed_lines--;
                    pixel_ptr = y_ptr;
                    pixel_countdown = s->avctx->width;
                    for (i = 0; i < line_packets; i++) {
                        /* account for the skip bytes */
                        pixel_skip = buf[stream_ptr++];
                        pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
                        pixel_countdown -= pixel_skip;
                        byte_run = buf[stream_ptr++];
                        if (byte_run < 0) {
                            byte_run = -byte_run;
                            pixel    = LE_16(&buf[stream_ptr]);
                            stream_ptr += 2;
                            CHECK_PIXEL_PTR(byte_run);
                            for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
                                *((signed short*)(&pixels[pixel_ptr])) = pixel;
                                pixel_ptr += 2;
                            }
                        } else {
                            CHECK_PIXEL_PTR(byte_run);
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
                                *((signed short*)(&pixels[pixel_ptr])) = LE_16(&buf[stream_ptr]);
                                stream_ptr += 2;
                                pixel_ptr += 2;
                            }
                        }
                    }

                    y_ptr += s->frame.linesize[0];
                }
            }
            break;

        case FLI_LC:
            av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-paletised FLC\n");
            stream_ptr = stream_ptr + chunk_size - 6;
            break;

        case FLI_BLACK:
            /* set the whole frame to 0x0000 which is balck in both 15Bpp and 16Bpp modes. */
            memset(pixels, 0x0000,
                   s->frame.linesize[0] * s->avctx->height * 2);
            break;

        case FLI_BRUN:
            y_ptr = 0;
            for (lines = 0; lines < s->avctx->height; lines++) {
                pixel_ptr = y_ptr;
                /* disregard the line packets; instead, iterate through all
                 * pixels on a row */
                stream_ptr++;
                pixel_countdown = (s->avctx->width * 2);
546

547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574
                while (pixel_countdown > 0) {
                    byte_run = buf[stream_ptr++];
                    if (byte_run > 0) {
                        palette_idx1 = buf[stream_ptr++];
                        CHECK_PIXEL_PTR(byte_run);
                        for (j = 0; j < byte_run; j++) {
                            pixels[pixel_ptr++] = palette_idx1;
                            pixel_countdown--;
                            if (pixel_countdown < 0)
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
                                       pixel_countdown);
                        }
                    } else {  /* copy bytes if byte_run < 0 */
                        byte_run = -byte_run;
                        CHECK_PIXEL_PTR(byte_run);
                        for (j = 0; j < byte_run; j++) {
                            palette_idx1 = buf[stream_ptr++];
                            pixels[pixel_ptr++] = palette_idx1;
                            pixel_countdown--;
                            if (pixel_countdown < 0)
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
                                       pixel_countdown);
                        }
                    }
                }

                /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
                 * This doesnt give us any good oportunity to perform word endian conversion
575
                 * during decompression. So if its requried (ie, this isnt a LE target, we do
576 577
                 * a second pass over the line here, swapping the bytes.
                 */
578
                pixel = 0xFF00;
579 580 581 582 583 584 585 586
                if (0xFF00 != LE_16(&pixel)) /* Check if its not an LE Target */
                {
                  pixel_ptr = y_ptr;
                  pixel_countdown = s->avctx->width;
                  while (pixel_countdown > 0) {
                    *((signed short*)(&pixels[pixel_ptr])) = LE_16(&buf[pixel_ptr]);
                    pixel_ptr += 2;
                  }
587
                }
588 589 590 591 592 593 594 595 596 597 598 599
                y_ptr += s->frame.linesize[0];
            }
            break;

        case FLI_DTA_BRUN:
            y_ptr = 0;
            for (lines = 0; lines < s->avctx->height; lines++) {
                pixel_ptr = y_ptr;
                /* disregard the line packets; instead, iterate through all
                 * pixels on a row */
                stream_ptr++;
                pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
600

601 602 603 604 605 606 607 608
                while (pixel_countdown > 0) {
                    byte_run = buf[stream_ptr++];
                    if (byte_run > 0) {
                        pixel    = LE_16(&buf[stream_ptr]);
                        stream_ptr += 2;
                        CHECK_PIXEL_PTR(byte_run);
                        for (j = 0; j < byte_run; j++) {
                            *((signed short*)(&pixels[pixel_ptr])) = pixel;
609
                            pixel_ptr += 2;
610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641
                            pixel_countdown--;
                            if (pixel_countdown < 0)
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
                                       pixel_countdown);
                        }
                    } else {  /* copy pixels if byte_run < 0 */
                        byte_run = -byte_run;
                        CHECK_PIXEL_PTR(byte_run);
                        for (j = 0; j < byte_run; j++) {
                            *((signed short*)(&pixels[pixel_ptr])) = LE_16(&buf[stream_ptr]);
                            stream_ptr += 2;
                            pixel_ptr  += 2;
                            pixel_countdown--;
                            if (pixel_countdown < 0)
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
                                       pixel_countdown);
                        }
                    }
                }

                y_ptr += s->frame.linesize[0];
            }
            break;

        case FLI_COPY:
        case FLI_DTA_COPY:
            /* copy the chunk (uncompressed frame) */
            if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {
                av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
                       "bigger than image, skipping chunk\n", chunk_size - 6);
                stream_ptr += chunk_size - 6;
            } else {
642

643 644 645 646 647 648 649 650 651
                for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
                     y_ptr += s->frame.linesize[0]) {

                    pixel_countdown = s->avctx->width;
                    pixel_ptr = 0;
                    while (pixel_countdown > 0) {
                      *((signed short*)(&pixels[y_ptr + pixel_ptr])) = LE_16(&buf[stream_ptr+pixel_ptr]);
                      pixel_ptr += 2;
                      pixel_countdown--;
652
                    }
653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704
                    stream_ptr += s->avctx->width*2;
                }
            }
            break;

        case FLI_MINI:
            /* some sort of a thumbnail? disregard this chunk... */
            stream_ptr += chunk_size - 6;
            break;

        default:
            av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
            break;
        }

        frame_size -= chunk_size;
        num_chunks--;
    }

    /* by the end of the chunk, the stream ptr should equal the frame
     * size (minus 1, possibly); if it doesn't, issue a warning */
    if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
        av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
               "and final chunk ptr = %d\n", buf_size, stream_ptr);


    *data_size=sizeof(AVFrame);
    *(AVFrame*)data = s->frame;

    return buf_size;
}

static int flic_decode_frame_24BPP(AVCodecContext *avctx,
                                   void *data, int *data_size,
                                   uint8_t *buf, int buf_size)
{
  av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
  return -1;
}

static int flic_decode_frame(AVCodecContext *avctx,
                             void *data, int *data_size,
                             uint8_t *buf, int buf_size)
{
    if (avctx->pix_fmt == PIX_FMT_PAL8) {
      return flic_decode_frame_8BPP(avctx, data, data_size,
                                    buf, buf_size);
    }
    else if ((avctx->pix_fmt == PIX_FMT_RGB555) ||
             (avctx->pix_fmt == PIX_FMT_RGB565)) {
      return flic_decode_frame_15_16BPP(avctx, data, data_size,
                                        buf, buf_size);
705
    }
706 707 708 709 710 711 712 713
    else if (avctx->pix_fmt == PIX_FMT_BGR24) {
      return flic_decode_frame_24BPP(avctx, data, data_size,
                                     buf, buf_size);
    }

    /* Shouldnt get  here, ever as the pix_fmt is processed */
    /* in flic_decode_init and the above if should deal with */
    /* the finite set of possibilites allowable by here. */
714
    /* but in case we do, just error out. */
715 716
    av_log(avctx, AV_LOG_ERROR, "Unknown Format of FLC. My Science cant explain how this happened\n");
    return -1;
717
}
718 719


Mike Melanson's avatar
Mike Melanson committed
720 721 722 723
static int flic_decode_end(AVCodecContext *avctx)
{
    FlicDecodeContext *s = avctx->priv_data;

724 725
    if (s->frame.data[0])
        avctx->release_buffer(avctx, &s->frame);
Mike Melanson's avatar
Mike Melanson committed
726 727 728 729 730 731 732 733 734 735 736 737 738 739

    return 0;
}

AVCodec flic_decoder = {
    "flic",
    CODEC_TYPE_VIDEO,
    CODEC_ID_FLIC,
    sizeof(FlicDecodeContext),
    flic_decode_init,
    NULL,
    flic_decode_end,
    flic_decode_frame,
    CODEC_CAP_DR1,
740 741 742
    NULL,
    NULL,
    NULL,
Mike Melanson's avatar
Mike Melanson committed
743 744
    NULL
};