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1
/*
2
 * FLI/FLC Animation Video Decoder
3
 * Copyright (C) 2003, 2004 the ffmpeg project
4
 *
5
 * This file is part of FFmpeg.
6
 *
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 * 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.
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 *
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 * 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
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 *
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 */
22

    
23
/**
24
 * @file flic.c
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 * Autodesk Animator FLI/FLC Video Decoder
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 * by Mike Melanson (melanson@pcisys.net)
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 * for more information on the .fli/.flc file format and all of its many
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 * variations, visit:
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 *   http://www.compuphase.com/flic.htm
30
 *
31
 * This decoder outputs PAL8/RGB555/RGB565 and maybe one day RGB24
32
 * colorspace data, depending on the FLC. To use this decoder, be
33
 * sure that your demuxer sends the FLI file header to the decoder via
34
 * the extradata chunk in AVCodecContext. The chunk should be 128 bytes
35
 * large. The only exception is for FLI files from the game "Magic Carpet",
36
 * in which the header is only 12 bytes.
37
 */
38

    
39
#include <stdio.h>
40
#include <stdlib.h>
41
#include <string.h>
42
#include <unistd.h>
43

    
44
#include "common.h"
45
#include "avcodec.h"
46
#include "bswap.h"
47

    
48
#define FLI_256_COLOR 4
49
#define FLI_DELTA     7
50
#define FLI_COLOR     11
51
#define FLI_LC        12
52
#define FLI_BLACK     13
53
#define FLI_BRUN      15
54
#define FLI_COPY      16
55
#define FLI_MINI      18
56
#define FLI_DTA_BRUN  25
57
#define FLI_DTA_COPY  26
58
#define FLI_DTA_LC    27
59

    
60
#define FLI_TYPE_CODE     (0xAF11)
61
#define FLC_FLX_TYPE_CODE (0xAF12)
62
#define FLC_DTA_TYPE_CODE (0xAF44) /* Marks an "Extended FLC" comes from Dave's Targa Animator (DTA) */
63
#define FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE (0xAF13)
64

    
65
#define CHECK_PIXEL_PTR(n) \
66
    if (pixel_ptr + n > pixel_limit) { \
67
        av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr >= pixel_limit (%d >= %d)\n", \
68
        pixel_ptr + n, pixel_limit); \
69
        return -1; \
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 int flic_decode_init(AVCodecContext *avctx)
82
{
83
    FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
84
    unsigned char *fli_header = (unsigned char *)avctx->extradata;
85
    int depth;
86

    
87
    s->avctx = avctx;
88
    avctx->has_b_frames = 0;
89

    
90
    s->fli_type = LE_16(&fli_header[4]); /* Might be overridden if a Magic Carpet FLC */
91
    depth       = LE_16(&fli_header[12]);
92

    
93
    if (depth == 0) {
94
      depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
95
    }
96

    
97
    if (s->avctx->extradata_size == 12) {
98
        /* special case for magic carpet FLIs */
99
        s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE;
100
    } else if (s->avctx->extradata_size != 128) {
101
        av_log(avctx, AV_LOG_ERROR, "Expected extradata of 12 or 128 bytes\n");
102
        return -1;
103
    }
104

    
105
    if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
106
        depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
107
    }
108

    
109
    switch (depth) {
110
        case 8  : avctx->pix_fmt = PIX_FMT_PAL8; break;
111
        case 15 : avctx->pix_fmt = PIX_FMT_RGB555; break;
112
        case 16 : avctx->pix_fmt = PIX_FMT_RGB565; break;
113
        case 24 : avctx->pix_fmt = PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */
114
                  av_log(avctx, AV_LOG_ERROR, "24Bpp FLC/FLX is unsupported due to no test files.\n");
115
                  return -1;
116
                  break;
117
        default :
118
                  av_log(avctx, AV_LOG_ERROR, "Unkown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
119
                  return -1;
120
    }
121

    
122
    s->frame.data[0] = NULL;
123
    s->new_palette = 0;
124

    
125
    return 0;
126
}
127

    
128
static int flic_decode_frame_8BPP(AVCodecContext *avctx,
129
                                  void *data, int *data_size,
130
                                  uint8_t *buf, int buf_size)
131
{
132
    FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
133

    
134
    int stream_ptr = 0;
135
    int stream_ptr_after_color_chunk;
136
    int pixel_ptr;
137
    int palette_ptr;
138
    unsigned char palette_idx1;
139
    unsigned char palette_idx2;
140

    
141
    unsigned int frame_size;
142
    int num_chunks;
143

    
144
    unsigned int chunk_size;
145
    int chunk_type;
146

    
147
    int i, j;
148

    
149
    int color_packets;
150
    int color_changes;
151
    int color_shift;
152
    unsigned char r, g, b;
153

    
154
    int lines;
155
    int compressed_lines;
156
    int starting_line;
157
    signed short line_packets;
158
    int y_ptr;
159
    int byte_run;
160
    int pixel_skip;
161
    int pixel_countdown;
162
    unsigned char *pixels;
163
    int pixel_limit;
164

    
165
    s->frame.reference = 1;
166
    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
167
    if (avctx->reget_buffer(avctx, &s->frame) < 0) {
168
        av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
169
        return -1;
170
    }
171

    
172
    pixels = s->frame.data[0];
173
    pixel_limit = s->avctx->height * s->frame.linesize[0];
174

    
175
    frame_size = LE_32(&buf[stream_ptr]);
176
    stream_ptr += 6;  /* skip the magic number */
177
    num_chunks = LE_16(&buf[stream_ptr]);
178
    stream_ptr += 10;  /* skip padding */
179

    
180
    frame_size -= 16;
181

    
182
    /* iterate through the chunks */
183
    while ((frame_size > 0) && (num_chunks > 0)) {
184
        chunk_size = LE_32(&buf[stream_ptr]);
185
        stream_ptr += 4;
186
        chunk_type = LE_16(&buf[stream_ptr]);
187
        stream_ptr += 2;
188

    
189
        switch (chunk_type) {
190
        case FLI_256_COLOR:
191
        case FLI_COLOR:
192
            stream_ptr_after_color_chunk = stream_ptr + chunk_size - 6;
193

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

    
210
                /* next byte indicates how many entries to change */
211
                color_changes = buf[stream_ptr++];
212

    
213
                /* if there are 0 color changes, there are actually 256 */
214
                if (color_changes == 0)
215
                    color_changes = 256;
216

    
217
                for (j = 0; j < color_changes; j++) {
218
                    unsigned int entry;
219

    
220
                    /* wrap around, for good measure */
221
                    if ((unsigned)palette_ptr >= 256)
222
                        palette_ptr = 0;
223

    
224
                    r = buf[stream_ptr++] << color_shift;
225
                    g = buf[stream_ptr++] << color_shift;
226
                    b = buf[stream_ptr++] << color_shift;
227
                    entry = (r << 16) | (g << 8) | b;
228
                    if (s->palette[palette_ptr] != entry)
229
                        s->new_palette = 1;
230
                    s->palette[palette_ptr++] = entry;
231
                }
232
            }
233

    
234
            /* color chunks sometimes have weird 16-bit alignment issues;
235
             * therefore, take the hardline approach and set the stream_ptr
236
             * to the value calculated w.r.t. the size specified by the color
237
             * chunk header */
238
            stream_ptr = stream_ptr_after_color_chunk;
239

    
240
            break;
241

    
242
        case FLI_DELTA:
243
            y_ptr = 0;
244
            compressed_lines = LE_16(&buf[stream_ptr]);
245
            stream_ptr += 2;
246
            while (compressed_lines > 0) {
247
                line_packets = LE_16(&buf[stream_ptr]);
248
                stream_ptr += 2;
249
                if (line_packets < 0) {
250
                    line_packets = -line_packets;
251
                    y_ptr += line_packets * s->frame.linesize[0];
252
                } else {
253
                    compressed_lines--;
254
                    pixel_ptr = y_ptr;
255
                    pixel_countdown = s->avctx->width;
256
                    for (i = 0; i < line_packets; i++) {
257
                        /* account for the skip bytes */
258
                        pixel_skip = buf[stream_ptr++];
259
                        pixel_ptr += pixel_skip;
260
                        pixel_countdown -= pixel_skip;
261
                        byte_run = (signed char)(buf[stream_ptr++]);
262
                        if (byte_run < 0) {
263
                            byte_run = -byte_run;
264
                            palette_idx1 = buf[stream_ptr++];
265
                            palette_idx2 = buf[stream_ptr++];
266
                            CHECK_PIXEL_PTR(byte_run);
267
                            for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
268
                                pixels[pixel_ptr++] = palette_idx1;
269
                                pixels[pixel_ptr++] = palette_idx2;
270
                            }
271
                        } else {
272
                            CHECK_PIXEL_PTR(byte_run * 2);
273
                            for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
274
                                palette_idx1 = buf[stream_ptr++];
275
                                pixels[pixel_ptr++] = palette_idx1;
276
                            }
277
                        }
278
                    }
279

    
280
                    y_ptr += s->frame.linesize[0];
281
                }
282
            }
283
            break;
284

    
285
        case FLI_LC:
286
            /* line compressed */
287
            starting_line = LE_16(&buf[stream_ptr]);
288
            stream_ptr += 2;
289
            y_ptr = 0;
290
            y_ptr += starting_line * s->frame.linesize[0];
291

    
292
            compressed_lines = LE_16(&buf[stream_ptr]);
293
            stream_ptr += 2;
294
            while (compressed_lines > 0) {
295
                pixel_ptr = y_ptr;
296
                pixel_countdown = s->avctx->width;
297
                line_packets = buf[stream_ptr++];
298
                if (line_packets > 0) {
299
                    for (i = 0; i < line_packets; i++) {
300
                        /* account for the skip bytes */
301
                        pixel_skip = buf[stream_ptr++];
302
                        pixel_ptr += pixel_skip;
303
                        pixel_countdown -= pixel_skip;
304
                        byte_run = (signed char)(buf[stream_ptr++]);
305
                        if (byte_run > 0) {
306
                            CHECK_PIXEL_PTR(byte_run);
307
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
308
                                palette_idx1 = buf[stream_ptr++];
309
                                pixels[pixel_ptr++] = palette_idx1;
310
                            }
311
                        } else if (byte_run < 0) {
312
                            byte_run = -byte_run;
313
                            palette_idx1 = buf[stream_ptr++];
314
                            CHECK_PIXEL_PTR(byte_run);
315
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
316
                                pixels[pixel_ptr++] = palette_idx1;
317
                            }
318
                        }
319
                    }
320
                }
321

    
322
                y_ptr += s->frame.linesize[0];
323
                compressed_lines--;
324
            }
325
            break;
326

    
327
        case FLI_BLACK:
328
            /* set the whole frame to color 0 (which is usually black) */
329
            memset(pixels, 0,
330
                s->frame.linesize[0] * s->avctx->height);
331
            break;
332

    
333
        case FLI_BRUN:
334
            /* Byte run compression: This chunk type only occurs in the first
335
             * FLI frame and it will update the entire frame. */
336
            y_ptr = 0;
337
            for (lines = 0; lines < s->avctx->height; lines++) {
338
                pixel_ptr = y_ptr;
339
                /* disregard the line packets; instead, iterate through all
340
                 * pixels on a row */
341
                stream_ptr++;
342
                pixel_countdown = s->avctx->width;
343
                while (pixel_countdown > 0) {
344
                    byte_run = (signed char)(buf[stream_ptr++]);
345
                    if (byte_run > 0) {
346
                        palette_idx1 = buf[stream_ptr++];
347
                        CHECK_PIXEL_PTR(byte_run);
348
                        for (j = 0; j < byte_run; j++) {
349
                            pixels[pixel_ptr++] = palette_idx1;
350
                            pixel_countdown--;
351
                            if (pixel_countdown < 0)
352
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
353
                                       pixel_countdown);
354
                        }
355
                    } else {  /* copy bytes if byte_run < 0 */
356
                        byte_run = -byte_run;
357
                        CHECK_PIXEL_PTR(byte_run);
358
                        for (j = 0; j < byte_run; j++) {
359
                            palette_idx1 = buf[stream_ptr++];
360
                            pixels[pixel_ptr++] = palette_idx1;
361
                            pixel_countdown--;
362
                            if (pixel_countdown < 0)
363
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
364
                                       pixel_countdown);
365
                        }
366
                    }
367
                }
368

    
369
                y_ptr += s->frame.linesize[0];
370
            }
371
            break;
372

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

    
389
        case FLI_MINI:
390
            /* some sort of a thumbnail? disregard this chunk... */
391
            stream_ptr += chunk_size - 6;
392
            break;
393

    
394
        default:
395
            av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
396
            break;
397
        }
398

    
399
        frame_size -= chunk_size;
400
        num_chunks--;
401
    }
402

    
403
    /* by the end of the chunk, the stream ptr should equal the frame
404
     * size (minus 1, possibly); if it doesn't, issue a warning */
405
    if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
406
        av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
407
               "and final chunk ptr = %d\n", buf_size, stream_ptr);
408

    
409
    /* make the palette available on the way out */
410
    memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
411
    if (s->new_palette) {
412
        s->frame.palette_has_changed = 1;
413
        s->new_palette = 0;
414
    }
415

    
416
    *data_size=sizeof(AVFrame);
417
    *(AVFrame*)data = s->frame;
418

    
419
    return buf_size;
420
}
421

    
422
static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
423
                                      void *data, int *data_size,
424
                                      uint8_t *buf, int buf_size)
425
{
426
    /* Note, the only difference between the 15Bpp and 16Bpp */
427
    /* Format is the pixel format, the packets are processed the same. */
428
    FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
429

    
430
    int stream_ptr = 0;
431
    int pixel_ptr;
432
    unsigned char palette_idx1;
433

    
434
    unsigned int frame_size;
435
    int num_chunks;
436

    
437
    unsigned int chunk_size;
438
    int chunk_type;
439

    
440
    int i, j;
441

    
442
    int lines;
443
    int compressed_lines;
444
    signed short line_packets;
445
    int y_ptr;
446
    int byte_run;
447
    int pixel_skip;
448
    int pixel_countdown;
449
    unsigned char *pixels;
450
    int pixel;
451
    int pixel_limit;
452

    
453
    s->frame.reference = 1;
454
    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
455
    if (avctx->reget_buffer(avctx, &s->frame) < 0) {
456
        av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
457
        return -1;
458
    }
459

    
460
    pixels = s->frame.data[0];
461
    pixel_limit = s->avctx->height * s->frame.linesize[0];
462

    
463
    frame_size = LE_32(&buf[stream_ptr]);
464
    stream_ptr += 6;  /* skip the magic number */
465
    num_chunks = LE_16(&buf[stream_ptr]);
466
    stream_ptr += 10;  /* skip padding */
467

    
468
    frame_size -= 16;
469

    
470
    /* iterate through the chunks */
471
    while ((frame_size > 0) && (num_chunks > 0)) {
472
        chunk_size = LE_32(&buf[stream_ptr]);
473
        stream_ptr += 4;
474
        chunk_type = LE_16(&buf[stream_ptr]);
475
        stream_ptr += 2;
476

    
477
        switch (chunk_type) {
478
        case FLI_256_COLOR:
479
        case FLI_COLOR:
480
            /* For some reason, it seems that non-paletised flics do include one of these */
481
            /* chunks in their first frame.  Why i do not know, it seems rather extraneous */
482
/*            av_log(avctx, AV_LOG_ERROR, "Unexpected Palette chunk %d in non-paletised FLC\n",chunk_type);*/
483
            stream_ptr = stream_ptr + chunk_size - 6;
484
            break;
485

    
486
        case FLI_DELTA:
487
        case FLI_DTA_LC:
488
            y_ptr = 0;
489
            compressed_lines = LE_16(&buf[stream_ptr]);
490
            stream_ptr += 2;
491
            while (compressed_lines > 0) {
492
                line_packets = LE_16(&buf[stream_ptr]);
493
                stream_ptr += 2;
494
                if (line_packets < 0) {
495
                    line_packets = -line_packets;
496
                    y_ptr += line_packets * s->frame.linesize[0];
497
                } else {
498
                    compressed_lines--;
499
                    pixel_ptr = y_ptr;
500
                    pixel_countdown = s->avctx->width;
501
                    for (i = 0; i < line_packets; i++) {
502
                        /* account for the skip bytes */
503
                        pixel_skip = buf[stream_ptr++];
504
                        pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
505
                        pixel_countdown -= pixel_skip;
506
                        byte_run = (signed char)(buf[stream_ptr++]);
507
                        if (byte_run < 0) {
508
                            byte_run = -byte_run;
509
                            pixel    = LE_16(&buf[stream_ptr]);
510
                            stream_ptr += 2;
511
                            CHECK_PIXEL_PTR(byte_run);
512
                            for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
513
                                *((signed short*)(&pixels[pixel_ptr])) = pixel;
514
                                pixel_ptr += 2;
515
                            }
516
                        } else {
517
                            CHECK_PIXEL_PTR(byte_run);
518
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
519
                                *((signed short*)(&pixels[pixel_ptr])) = LE_16(&buf[stream_ptr]);
520
                                stream_ptr += 2;
521
                                pixel_ptr += 2;
522
                            }
523
                        }
524
                    }
525

    
526
                    y_ptr += s->frame.linesize[0];
527
                }
528
            }
529
            break;
530

    
531
        case FLI_LC:
532
            av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-paletised FLC\n");
533
            stream_ptr = stream_ptr + chunk_size - 6;
534
            break;
535

    
536
        case FLI_BLACK:
537
            /* set the whole frame to 0x0000 which is balck in both 15Bpp and 16Bpp modes. */
538
            memset(pixels, 0x0000,
539
                   s->frame.linesize[0] * s->avctx->height);
540
            break;
541

    
542
        case FLI_BRUN:
543
            y_ptr = 0;
544
            for (lines = 0; lines < s->avctx->height; lines++) {
545
                pixel_ptr = y_ptr;
546
                /* disregard the line packets; instead, iterate through all
547
                 * pixels on a row */
548
                stream_ptr++;
549
                pixel_countdown = (s->avctx->width * 2);
550

    
551
                while (pixel_countdown > 0) {
552
                    byte_run = (signed char)(buf[stream_ptr++]);
553
                    if (byte_run > 0) {
554
                        palette_idx1 = buf[stream_ptr++];
555
                        CHECK_PIXEL_PTR(byte_run);
556
                        for (j = 0; j < byte_run; j++) {
557
                            pixels[pixel_ptr++] = palette_idx1;
558
                            pixel_countdown--;
559
                            if (pixel_countdown < 0)
560
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
561
                                       pixel_countdown);
562
                        }
563
                    } else {  /* copy bytes if byte_run < 0 */
564
                        byte_run = -byte_run;
565
                        CHECK_PIXEL_PTR(byte_run);
566
                        for (j = 0; j < byte_run; j++) {
567
                            palette_idx1 = buf[stream_ptr++];
568
                            pixels[pixel_ptr++] = palette_idx1;
569
                            pixel_countdown--;
570
                            if (pixel_countdown < 0)
571
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
572
                                       pixel_countdown);
573
                        }
574
                    }
575
                }
576

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

    
596
        case FLI_DTA_BRUN:
597
            y_ptr = 0;
598
            for (lines = 0; lines < s->avctx->height; lines++) {
599
                pixel_ptr = y_ptr;
600
                /* disregard the line packets; instead, iterate through all
601
                 * pixels on a row */
602
                stream_ptr++;
603
                pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
604

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

    
634
                y_ptr += s->frame.linesize[0];
635
            }
636
            break;
637

    
638
        case FLI_COPY:
639
        case FLI_DTA_COPY:
640
            /* copy the chunk (uncompressed frame) */
641
            if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {
642
                av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
643
                       "bigger than image, skipping chunk\n", chunk_size - 6);
644
                stream_ptr += chunk_size - 6;
645
            } else {
646

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

    
650
                    pixel_countdown = s->avctx->width;
651
                    pixel_ptr = 0;
652
                    while (pixel_countdown > 0) {
653
                      *((signed short*)(&pixels[y_ptr + pixel_ptr])) = LE_16(&buf[stream_ptr+pixel_ptr]);
654
                      pixel_ptr += 2;
655
                      pixel_countdown--;
656
                    }
657
                    stream_ptr += s->avctx->width*2;
658
                }
659
            }
660
            break;
661

    
662
        case FLI_MINI:
663
            /* some sort of a thumbnail? disregard this chunk... */
664
            stream_ptr += chunk_size - 6;
665
            break;
666

    
667
        default:
668
            av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
669
            break;
670
        }
671

    
672
        frame_size -= chunk_size;
673
        num_chunks--;
674
    }
675

    
676
    /* by the end of the chunk, the stream ptr should equal the frame
677
     * size (minus 1, possibly); if it doesn't, issue a warning */
678
    if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
679
        av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
680
               "and final chunk ptr = %d\n", buf_size, stream_ptr);
681

    
682

    
683
    *data_size=sizeof(AVFrame);
684
    *(AVFrame*)data = s->frame;
685

    
686
    return buf_size;
687
}
688

    
689
static int flic_decode_frame_24BPP(AVCodecContext *avctx,
690
                                   void *data, int *data_size,
691
                                   uint8_t *buf, int buf_size)
692
{
693
  av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
694
  return -1;
695
}
696

    
697
static int flic_decode_frame(AVCodecContext *avctx,
698
                             void *data, int *data_size,
699
                             uint8_t *buf, int buf_size)
700
{
701
    if (avctx->pix_fmt == PIX_FMT_PAL8) {
702
      return flic_decode_frame_8BPP(avctx, data, data_size,
703
                                    buf, buf_size);
704
    }
705
    else if ((avctx->pix_fmt == PIX_FMT_RGB555) ||
706
             (avctx->pix_fmt == PIX_FMT_RGB565)) {
707
      return flic_decode_frame_15_16BPP(avctx, data, data_size,
708
                                        buf, buf_size);
709
    }
710
    else if (avctx->pix_fmt == PIX_FMT_BGR24) {
711
      return flic_decode_frame_24BPP(avctx, data, data_size,
712
                                     buf, buf_size);
713
    }
714

    
715
    /* Shouldnt get  here, ever as the pix_fmt is processed */
716
    /* in flic_decode_init and the above if should deal with */
717
    /* the finite set of possibilites allowable by here. */
718
    /* but in case we do, just error out. */
719
    av_log(avctx, AV_LOG_ERROR, "Unknown Format of FLC. My Science cant explain how this happened\n");
720
    return -1;
721
}
722

    
723

    
724
static int flic_decode_end(AVCodecContext *avctx)
725
{
726
    FlicDecodeContext *s = avctx->priv_data;
727

    
728
    if (s->frame.data[0])
729
        avctx->release_buffer(avctx, &s->frame);
730

    
731
    return 0;
732
}
733

    
734
AVCodec flic_decoder = {
735
    "flic",
736
    CODEC_TYPE_VIDEO,
737
    CODEC_ID_FLIC,
738
    sizeof(FlicDecodeContext),
739
    flic_decode_init,
740
    NULL,
741
    flic_decode_end,
742
    flic_decode_frame,
743
    CODEC_CAP_DR1,
744
    NULL,
745
    NULL,
746
    NULL,
747
    NULL
748
};