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ffmpeg / libavcodec / flicvideo.c @ 755bfeab

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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
26
 * by Mike Melanson (melanson@pcisys.net)
27
 * 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
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 * 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 "avcodec.h"
45
#include "bswap.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_INFO, "Problem: pixel_ptr >= pixel_limit (%d >= %d)\n", \
67
        pixel_ptr + n, pixel_limit); \
68
        return -1; \
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 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
    s->avctx = avctx;
87

    
88
    s->fli_type = AV_RL16(&fli_header[4]); /* Might be overridden if a Magic Carpet FLC */
89
    depth       = AV_RL16(&fli_header[12]);
90

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

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

    
103
    if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
104
        depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
105
    }
106

    
107
    switch (depth) {
108
        case 8  : avctx->pix_fmt = PIX_FMT_PAL8; break;
109
        case 15 : avctx->pix_fmt = PIX_FMT_RGB555; break;
110
        case 16 : avctx->pix_fmt = PIX_FMT_RGB565; break;
111
        case 24 : avctx->pix_fmt = PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */
112
                  av_log(avctx, AV_LOG_ERROR, "24Bpp FLC/FLX is unsupported due to no test files.\n");
113
                  return -1;
114
                  break;
115
        default :
116
                  av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
117
                  return -1;
118
    }
119

    
120
    s->frame.data[0] = NULL;
121
    s->new_palette = 0;
122

    
123
    return 0;
124
}
125

    
126
static int flic_decode_frame_8BPP(AVCodecContext *avctx,
127
                                  void *data, int *data_size,
128
                                  uint8_t *buf, int buf_size)
129
{
130
    FlicDecodeContext *s = avctx->priv_data;
131

    
132
    int stream_ptr = 0;
133
    int stream_ptr_after_color_chunk;
134
    int pixel_ptr;
135
    int palette_ptr;
136
    unsigned char palette_idx1;
137
    unsigned char palette_idx2;
138

    
139
    unsigned int frame_size;
140
    int num_chunks;
141

    
142
    unsigned int chunk_size;
143
    int chunk_type;
144

    
145
    int i, j;
146

    
147
    int color_packets;
148
    int color_changes;
149
    int color_shift;
150
    unsigned char r, g, b;
151

    
152
    int lines;
153
    int compressed_lines;
154
    int starting_line;
155
    signed short line_packets;
156
    int y_ptr;
157
    int byte_run;
158
    int pixel_skip;
159
    int pixel_countdown;
160
    unsigned char *pixels;
161
    int pixel_limit;
162

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

    
170
    pixels = s->frame.data[0];
171
    pixel_limit = s->avctx->height * s->frame.linesize[0];
172

    
173
    frame_size = AV_RL32(&buf[stream_ptr]);
174
    stream_ptr += 6;  /* skip the magic number */
175
    num_chunks = AV_RL16(&buf[stream_ptr]);
176
    stream_ptr += 10;  /* skip padding */
177

    
178
    frame_size -= 16;
179

    
180
    /* iterate through the chunks */
181
    while ((frame_size > 0) && (num_chunks > 0)) {
182
        chunk_size = AV_RL32(&buf[stream_ptr]);
183
        stream_ptr += 4;
184
        chunk_type = AV_RL16(&buf[stream_ptr]);
185
        stream_ptr += 2;
186

    
187
        switch (chunk_type) {
188
        case FLI_256_COLOR:
189
        case FLI_COLOR:
190
            stream_ptr_after_color_chunk = stream_ptr + chunk_size - 6;
191

    
192
            /* check special case: If this file is from the Magic Carpet
193
             * game and uses 6-bit colors even though it reports 256-color
194
             * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
195
             * initialization) */
196
            if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
197
                color_shift = 0;
198
            else
199
                color_shift = 2;
200
            /* set up the palette */
201
            color_packets = AV_RL16(&buf[stream_ptr]);
202
            stream_ptr += 2;
203
            palette_ptr = 0;
204
            for (i = 0; i < color_packets; i++) {
205
                /* first byte is how many colors to skip */
206
                palette_ptr += buf[stream_ptr++];
207

    
208
                /* next byte indicates how many entries to change */
209
                color_changes = buf[stream_ptr++];
210

    
211
                /* if there are 0 color changes, there are actually 256 */
212
                if (color_changes == 0)
213
                    color_changes = 256;
214

    
215
                for (j = 0; j < color_changes; j++) {
216
                    unsigned int entry;
217

    
218
                    /* wrap around, for good measure */
219
                    if ((unsigned)palette_ptr >= 256)
220
                        palette_ptr = 0;
221

    
222
                    r = buf[stream_ptr++] << color_shift;
223
                    g = buf[stream_ptr++] << color_shift;
224
                    b = buf[stream_ptr++] << color_shift;
225
                    entry = (r << 16) | (g << 8) | b;
226
                    if (s->palette[palette_ptr] != entry)
227
                        s->new_palette = 1;
228
                    s->palette[palette_ptr++] = entry;
229
                }
230
            }
231

    
232
            /* color chunks sometimes have weird 16-bit alignment issues;
233
             * therefore, take the hardline approach and set the stream_ptr
234
             * to the value calculated w.r.t. the size specified by the color
235
             * chunk header */
236
            stream_ptr = stream_ptr_after_color_chunk;
237

    
238
            break;
239

    
240
        case FLI_DELTA:
241
            y_ptr = 0;
242
            compressed_lines = AV_RL16(&buf[stream_ptr]);
243
            stream_ptr += 2;
244
            while (compressed_lines > 0) {
245
                line_packets = AV_RL16(&buf[stream_ptr]);
246
                stream_ptr += 2;
247
                if ((line_packets & 0xC000) == 0xC000) {
248
                    // line skip opcode
249
                    line_packets = -line_packets;
250
                    y_ptr += line_packets * s->frame.linesize[0];
251
                } else if ((line_packets & 0xC000) == 0x4000) {
252
                    av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);
253
                } else if ((line_packets & 0xC000) == 0x8000) {
254
                    // "last byte" opcode
255
                    pixels[y_ptr + s->frame.linesize[0] - 1] = line_packets & 0xff;
256
                } else {
257
                    compressed_lines--;
258
                    pixel_ptr = y_ptr;
259
                    pixel_countdown = s->avctx->width;
260
                    for (i = 0; i < line_packets; i++) {
261
                        /* account for the skip bytes */
262
                        pixel_skip = buf[stream_ptr++];
263
                        pixel_ptr += pixel_skip;
264
                        pixel_countdown -= pixel_skip;
265
                        byte_run = (signed char)(buf[stream_ptr++]);
266
                        if (byte_run < 0) {
267
                            byte_run = -byte_run;
268
                            palette_idx1 = buf[stream_ptr++];
269
                            palette_idx2 = buf[stream_ptr++];
270
                            CHECK_PIXEL_PTR(byte_run);
271
                            for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
272
                                pixels[pixel_ptr++] = palette_idx1;
273
                                pixels[pixel_ptr++] = palette_idx2;
274
                            }
275
                        } else {
276
                            CHECK_PIXEL_PTR(byte_run * 2);
277
                            for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
278
                                palette_idx1 = buf[stream_ptr++];
279
                                pixels[pixel_ptr++] = palette_idx1;
280
                            }
281
                        }
282
                    }
283

    
284
                    y_ptr += s->frame.linesize[0];
285
                }
286
            }
287
            break;
288

    
289
        case FLI_LC:
290
            /* line compressed */
291
            starting_line = AV_RL16(&buf[stream_ptr]);
292
            stream_ptr += 2;
293
            y_ptr = 0;
294
            y_ptr += starting_line * s->frame.linesize[0];
295

    
296
            compressed_lines = AV_RL16(&buf[stream_ptr]);
297
            stream_ptr += 2;
298
            while (compressed_lines > 0) {
299
                pixel_ptr = y_ptr;
300
                pixel_countdown = s->avctx->width;
301
                line_packets = buf[stream_ptr++];
302
                if (line_packets > 0) {
303
                    for (i = 0; i < line_packets; i++) {
304
                        /* account for the skip bytes */
305
                        pixel_skip = buf[stream_ptr++];
306
                        pixel_ptr += pixel_skip;
307
                        pixel_countdown -= pixel_skip;
308
                        byte_run = (signed char)(buf[stream_ptr++]);
309
                        if (byte_run > 0) {
310
                            CHECK_PIXEL_PTR(byte_run);
311
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
312
                                palette_idx1 = buf[stream_ptr++];
313
                                pixels[pixel_ptr++] = palette_idx1;
314
                            }
315
                        } else if (byte_run < 0) {
316
                            byte_run = -byte_run;
317
                            palette_idx1 = buf[stream_ptr++];
318
                            CHECK_PIXEL_PTR(byte_run);
319
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
320
                                pixels[pixel_ptr++] = palette_idx1;
321
                            }
322
                        }
323
                    }
324
                }
325

    
326
                y_ptr += s->frame.linesize[0];
327
                compressed_lines--;
328
            }
329
            break;
330

    
331
        case FLI_BLACK:
332
            /* set the whole frame to color 0 (which is usually black) */
333
            memset(pixels, 0,
334
                s->frame.linesize[0] * s->avctx->height);
335
            break;
336

    
337
        case FLI_BRUN:
338
            /* Byte run compression: This chunk type only occurs in the first
339
             * FLI frame and it will update the entire frame. */
340
            y_ptr = 0;
341
            for (lines = 0; lines < s->avctx->height; lines++) {
342
                pixel_ptr = y_ptr;
343
                /* disregard the line packets; instead, iterate through all
344
                 * pixels on a row */
345
                stream_ptr++;
346
                pixel_countdown = s->avctx->width;
347
                while (pixel_countdown > 0) {
348
                    byte_run = (signed char)(buf[stream_ptr++]);
349
                    if (byte_run > 0) {
350
                        palette_idx1 = buf[stream_ptr++];
351
                        CHECK_PIXEL_PTR(byte_run);
352
                        for (j = 0; j < byte_run; j++) {
353
                            pixels[pixel_ptr++] = palette_idx1;
354
                            pixel_countdown--;
355
                            if (pixel_countdown < 0)
356
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
357
                                       pixel_countdown, lines);
358
                        }
359
                    } else {  /* copy bytes if byte_run < 0 */
360
                        byte_run = -byte_run;
361
                        CHECK_PIXEL_PTR(byte_run);
362
                        for (j = 0; j < byte_run; j++) {
363
                            palette_idx1 = buf[stream_ptr++];
364
                            pixels[pixel_ptr++] = palette_idx1;
365
                            pixel_countdown--;
366
                            if (pixel_countdown < 0)
367
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
368
                                       pixel_countdown, lines);
369
                        }
370
                    }
371
                }
372

    
373
                y_ptr += s->frame.linesize[0];
374
            }
375
            break;
376

    
377
        case FLI_COPY:
378
            /* copy the chunk (uncompressed frame) */
379
            if (chunk_size - 6 > s->avctx->width * s->avctx->height) {
380
                av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
381
                       "bigger than image, skipping chunk\n", chunk_size - 6);
382
                stream_ptr += chunk_size - 6;
383
            } else {
384
                for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
385
                     y_ptr += s->frame.linesize[0]) {
386
                    memcpy(&pixels[y_ptr], &buf[stream_ptr],
387
                        s->avctx->width);
388
                    stream_ptr += s->avctx->width;
389
                }
390
            }
391
            break;
392

    
393
        case FLI_MINI:
394
            /* some sort of a thumbnail? disregard this chunk... */
395
            stream_ptr += chunk_size - 6;
396
            break;
397

    
398
        default:
399
            av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
400
            break;
401
        }
402

    
403
        frame_size -= chunk_size;
404
        num_chunks--;
405
    }
406

    
407
    /* by the end of the chunk, the stream ptr should equal the frame
408
     * size (minus 1, possibly); if it doesn't, issue a warning */
409
    if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
410
        av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
411
               "and final chunk ptr = %d\n", buf_size, stream_ptr);
412

    
413
    /* make the palette available on the way out */
414
    memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
415
    if (s->new_palette) {
416
        s->frame.palette_has_changed = 1;
417
        s->new_palette = 0;
418
    }
419

    
420
    *data_size=sizeof(AVFrame);
421
    *(AVFrame*)data = s->frame;
422

    
423
    return buf_size;
424
}
425

    
426
static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
427
                                      void *data, int *data_size,
428
                                      uint8_t *buf, int buf_size)
429
{
430
    /* Note, the only difference between the 15Bpp and 16Bpp */
431
    /* Format is the pixel format, the packets are processed the same. */
432
    FlicDecodeContext *s = avctx->priv_data;
433

    
434
    int stream_ptr = 0;
435
    int pixel_ptr;
436
    unsigned char palette_idx1;
437

    
438
    unsigned int frame_size;
439
    int num_chunks;
440

    
441
    unsigned int chunk_size;
442
    int chunk_type;
443

    
444
    int i, j;
445

    
446
    int lines;
447
    int compressed_lines;
448
    signed short line_packets;
449
    int y_ptr;
450
    int byte_run;
451
    int pixel_skip;
452
    int pixel_countdown;
453
    unsigned char *pixels;
454
    int pixel;
455
    int pixel_limit;
456

    
457
    s->frame.reference = 1;
458
    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
459
    if (avctx->reget_buffer(avctx, &s->frame) < 0) {
460
        av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
461
        return -1;
462
    }
463

    
464
    pixels = s->frame.data[0];
465
    pixel_limit = s->avctx->height * s->frame.linesize[0];
466

    
467
    frame_size = AV_RL32(&buf[stream_ptr]);
468
    stream_ptr += 6;  /* skip the magic number */
469
    num_chunks = AV_RL16(&buf[stream_ptr]);
470
    stream_ptr += 10;  /* skip padding */
471

    
472
    frame_size -= 16;
473

    
474
    /* iterate through the chunks */
475
    while ((frame_size > 0) && (num_chunks > 0)) {
476
        chunk_size = AV_RL32(&buf[stream_ptr]);
477
        stream_ptr += 4;
478
        chunk_type = AV_RL16(&buf[stream_ptr]);
479
        stream_ptr += 2;
480

    
481
        switch (chunk_type) {
482
        case FLI_256_COLOR:
483
        case FLI_COLOR:
484
            /* For some reason, it seems that non-paletised flics do include one of these */
485
            /* chunks in their first frame.  Why i do not know, it seems rather extraneous */
486
/*            av_log(avctx, AV_LOG_ERROR, "Unexpected Palette chunk %d in non-paletised FLC\n",chunk_type);*/
487
            stream_ptr = stream_ptr + chunk_size - 6;
488
            break;
489

    
490
        case FLI_DELTA:
491
        case FLI_DTA_LC:
492
            y_ptr = 0;
493
            compressed_lines = AV_RL16(&buf[stream_ptr]);
494
            stream_ptr += 2;
495
            while (compressed_lines > 0) {
496
                line_packets = AV_RL16(&buf[stream_ptr]);
497
                stream_ptr += 2;
498
                if (line_packets < 0) {
499
                    line_packets = -line_packets;
500
                    y_ptr += line_packets * s->frame.linesize[0];
501
                } else {
502
                    compressed_lines--;
503
                    pixel_ptr = y_ptr;
504
                    pixel_countdown = s->avctx->width;
505
                    for (i = 0; i < line_packets; i++) {
506
                        /* account for the skip bytes */
507
                        pixel_skip = buf[stream_ptr++];
508
                        pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
509
                        pixel_countdown -= pixel_skip;
510
                        byte_run = (signed char)(buf[stream_ptr++]);
511
                        if (byte_run < 0) {
512
                            byte_run = -byte_run;
513
                            pixel    = AV_RL16(&buf[stream_ptr]);
514
                            stream_ptr += 2;
515
                            CHECK_PIXEL_PTR(byte_run);
516
                            for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
517
                                *((signed short*)(&pixels[pixel_ptr])) = pixel;
518
                                pixel_ptr += 2;
519
                            }
520
                        } else {
521
                            CHECK_PIXEL_PTR(byte_run);
522
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
523
                                *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[stream_ptr]);
524
                                stream_ptr += 2;
525
                                pixel_ptr += 2;
526
                            }
527
                        }
528
                    }
529

    
530
                    y_ptr += s->frame.linesize[0];
531
                }
532
            }
533
            break;
534

    
535
        case FLI_LC:
536
            av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-paletised FLC\n");
537
            stream_ptr = stream_ptr + chunk_size - 6;
538
            break;
539

    
540
        case FLI_BLACK:
541
            /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */
542
            memset(pixels, 0x0000,
543
                   s->frame.linesize[0] * s->avctx->height);
544
            break;
545

    
546
        case FLI_BRUN:
547
            y_ptr = 0;
548
            for (lines = 0; lines < s->avctx->height; lines++) {
549
                pixel_ptr = y_ptr;
550
                /* disregard the line packets; instead, iterate through all
551
                 * pixels on a row */
552
                stream_ptr++;
553
                pixel_countdown = (s->avctx->width * 2);
554

    
555
                while (pixel_countdown > 0) {
556
                    byte_run = (signed char)(buf[stream_ptr++]);
557
                    if (byte_run > 0) {
558
                        palette_idx1 = buf[stream_ptr++];
559
                        CHECK_PIXEL_PTR(byte_run);
560
                        for (j = 0; j < byte_run; j++) {
561
                            pixels[pixel_ptr++] = palette_idx1;
562
                            pixel_countdown--;
563
                            if (pixel_countdown < 0)
564
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
565
                                       pixel_countdown, lines);
566
                        }
567
                    } else {  /* copy bytes if byte_run < 0 */
568
                        byte_run = -byte_run;
569
                        CHECK_PIXEL_PTR(byte_run);
570
                        for (j = 0; j < byte_run; j++) {
571
                            palette_idx1 = buf[stream_ptr++];
572
                            pixels[pixel_ptr++] = palette_idx1;
573
                            pixel_countdown--;
574
                            if (pixel_countdown < 0)
575
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
576
                                       pixel_countdown, lines);
577
                        }
578
                    }
579
                }
580

    
581
                /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
582
                 * This does not give us any good oportunity to perform word endian conversion
583
                 * during decompression. So if it is required (i.e., this is not a LE target, we do
584
                 * a second pass over the line here, swapping the bytes.
585
                 */
586
                pixel = 0xFF00;
587
                if (0xFF00 != AV_RL16(&pixel)) /* Check if its not an LE Target */
588
                {
589
                  pixel_ptr = y_ptr;
590
                  pixel_countdown = s->avctx->width;
591
                  while (pixel_countdown > 0) {
592
                    *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[pixel_ptr]);
593
                    pixel_ptr += 2;
594
                  }
595
                }
596
                y_ptr += s->frame.linesize[0];
597
            }
598
            break;
599

    
600
        case FLI_DTA_BRUN:
601
            y_ptr = 0;
602
            for (lines = 0; lines < s->avctx->height; lines++) {
603
                pixel_ptr = y_ptr;
604
                /* disregard the line packets; instead, iterate through all
605
                 * pixels on a row */
606
                stream_ptr++;
607
                pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
608

    
609
                while (pixel_countdown > 0) {
610
                    byte_run = (signed char)(buf[stream_ptr++]);
611
                    if (byte_run > 0) {
612
                        pixel    = AV_RL16(&buf[stream_ptr]);
613
                        stream_ptr += 2;
614
                        CHECK_PIXEL_PTR(byte_run);
615
                        for (j = 0; j < byte_run; j++) {
616
                            *((signed short*)(&pixels[pixel_ptr])) = pixel;
617
                            pixel_ptr += 2;
618
                            pixel_countdown--;
619
                            if (pixel_countdown < 0)
620
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
621
                                       pixel_countdown);
622
                        }
623
                    } else {  /* copy pixels if byte_run < 0 */
624
                        byte_run = -byte_run;
625
                        CHECK_PIXEL_PTR(byte_run);
626
                        for (j = 0; j < byte_run; j++) {
627
                            *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[stream_ptr]);
628
                            stream_ptr += 2;
629
                            pixel_ptr  += 2;
630
                            pixel_countdown--;
631
                            if (pixel_countdown < 0)
632
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
633
                                       pixel_countdown);
634
                        }
635
                    }
636
                }
637

    
638
                y_ptr += s->frame.linesize[0];
639
            }
640
            break;
641

    
642
        case FLI_COPY:
643
        case FLI_DTA_COPY:
644
            /* copy the chunk (uncompressed frame) */
645
            if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {
646
                av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
647
                       "bigger than image, skipping chunk\n", chunk_size - 6);
648
                stream_ptr += chunk_size - 6;
649
            } else {
650

    
651
                for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
652
                     y_ptr += s->frame.linesize[0]) {
653

    
654
                    pixel_countdown = s->avctx->width;
655
                    pixel_ptr = 0;
656
                    while (pixel_countdown > 0) {
657
                      *((signed short*)(&pixels[y_ptr + pixel_ptr])) = AV_RL16(&buf[stream_ptr+pixel_ptr]);
658
                      pixel_ptr += 2;
659
                      pixel_countdown--;
660
                    }
661
                    stream_ptr += s->avctx->width*2;
662
                }
663
            }
664
            break;
665

    
666
        case FLI_MINI:
667
            /* some sort of a thumbnail? disregard this chunk... */
668
            stream_ptr += chunk_size - 6;
669
            break;
670

    
671
        default:
672
            av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
673
            break;
674
        }
675

    
676
        frame_size -= chunk_size;
677
        num_chunks--;
678
    }
679

    
680
    /* by the end of the chunk, the stream ptr should equal the frame
681
     * size (minus 1, possibly); if it doesn't, issue a warning */
682
    if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
683
        av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
684
               "and final chunk ptr = %d\n", buf_size, stream_ptr);
685

    
686

    
687
    *data_size=sizeof(AVFrame);
688
    *(AVFrame*)data = s->frame;
689

    
690
    return buf_size;
691
}
692

    
693
static int flic_decode_frame_24BPP(AVCodecContext *avctx,
694
                                   void *data, int *data_size,
695
                                   uint8_t *buf, int buf_size)
696
{
697
  av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
698
  return -1;
699
}
700

    
701
static int flic_decode_frame(AVCodecContext *avctx,
702
                             void *data, int *data_size,
703
                             uint8_t *buf, int buf_size)
704
{
705
    if (avctx->pix_fmt == PIX_FMT_PAL8) {
706
      return flic_decode_frame_8BPP(avctx, data, data_size,
707
                                    buf, buf_size);
708
    }
709
    else if ((avctx->pix_fmt == PIX_FMT_RGB555) ||
710
             (avctx->pix_fmt == PIX_FMT_RGB565)) {
711
      return flic_decode_frame_15_16BPP(avctx, data, data_size,
712
                                        buf, buf_size);
713
    }
714
    else if (avctx->pix_fmt == PIX_FMT_BGR24) {
715
      return flic_decode_frame_24BPP(avctx, data, data_size,
716
                                     buf, buf_size);
717
    }
718

    
719
    /* Should not get  here, ever as the pix_fmt is processed */
720
    /* in flic_decode_init and the above if should deal with */
721
    /* the finite set of possibilites allowable by here. */
722
    /* But in case we do, just error out. */
723
    av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");
724
    return -1;
725
}
726

    
727

    
728
static int flic_decode_end(AVCodecContext *avctx)
729
{
730
    FlicDecodeContext *s = avctx->priv_data;
731

    
732
    if (s->frame.data[0])
733
        avctx->release_buffer(avctx, &s->frame);
734

    
735
    return 0;
736
}
737

    
738
AVCodec flic_decoder = {
739
    "flic",
740
    CODEC_TYPE_VIDEO,
741
    CODEC_ID_FLIC,
742
    sizeof(FlicDecodeContext),
743
    flic_decode_init,
744
    NULL,
745
    flic_decode_end,
746
    flic_decode_frame,
747
    CODEC_CAP_DR1,
748
    NULL,
749
    NULL,
750
    NULL,
751
    NULL
752
};