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ffmpeg / libavcodec / flicvideo.c @ 72415b2a

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1
/*
2
 * FLI/FLC Animation Video Decoder
3
 * Copyright (C) 2003, 2004 the ffmpeg project
4
 *
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 * 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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 */
21

    
22
/**
23
 * @file libavcodec/flicvideo.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
29
 *
30
 * This decoder outputs PAL8/RGB555/RGB565 and maybe one day RGB24
31
 * colorspace data, depending on the FLC. To use this decoder, be
32
 * sure that your demuxer sends the FLI file header to the decoder via
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 * the extradata chunk in AVCodecContext. The chunk should be 128 bytes
34
 * large. The only exception is for FLI files from the game "Magic Carpet",
35
 * in which the header is only 12 bytes.
36
 */
37

    
38
#include <stdio.h>
39
#include <stdlib.h>
40
#include <string.h>
41

    
42
#include "libavutil/intreadwrite.h"
43
#include "avcodec.h"
44

    
45
#define FLI_256_COLOR 4
46
#define FLI_DELTA     7
47
#define FLI_COLOR     11
48
#define FLI_LC        12
49
#define FLI_BLACK     13
50
#define FLI_BRUN      15
51
#define FLI_COPY      16
52
#define FLI_MINI      18
53
#define FLI_DTA_BRUN  25
54
#define FLI_DTA_COPY  26
55
#define FLI_DTA_LC    27
56

    
57
#define FLI_TYPE_CODE     (0xAF11)
58
#define FLC_FLX_TYPE_CODE (0xAF12)
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#define FLC_DTA_TYPE_CODE (0xAF44) /* Marks an "Extended FLC" comes from Dave's Targa Animator (DTA) */
60
#define FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE (0xAF13)
61

    
62
#define CHECK_PIXEL_PTR(n) \
63
    if (pixel_ptr + n > pixel_limit) { \
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        av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr >= pixel_limit (%d >= %d)\n", \
65
        pixel_ptr + n, pixel_limit); \
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        return -1; \
67
    } \
68

    
69
typedef struct FlicDecodeContext {
70
    AVCodecContext *avctx;
71
    AVFrame frame;
72

    
73
    unsigned int palette[256];
74
    int new_palette;
75
    int fli_type;  /* either 0xAF11 or 0xAF12, affects palette resolution */
76
} FlicDecodeContext;
77

    
78
static av_cold int flic_decode_init(AVCodecContext *avctx)
79
{
80
    FlicDecodeContext *s = avctx->priv_data;
81
    unsigned char *fli_header = (unsigned char *)avctx->extradata;
82
    int depth;
83

    
84
    s->avctx = avctx;
85

    
86
    s->fli_type = AV_RL16(&fli_header[4]); /* Might be overridden if a Magic Carpet FLC */
87

    
88
    depth = 0;
89
    if (s->avctx->extradata_size == 12) {
90
        /* special case for magic carpet FLIs */
91
        s->fli_type = FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE;
92
        depth = 8;
93
    } else if (s->avctx->extradata_size != 128) {
94
        av_log(avctx, AV_LOG_ERROR, "Expected extradata of 12 or 128 bytes\n");
95
        return -1;
96
    } else {
97
        depth = AV_RL16(&fli_header[12]);
98
    }
99

    
100
    if (depth == 0) {
101
        depth = 8; /* Some FLC generators set depth to zero, when they mean 8Bpp. Fix up here */
102
    }
103

    
104
    if ((s->fli_type == FLC_FLX_TYPE_CODE) && (depth == 16)) {
105
        depth = 15; /* Original Autodesk FLX's say the depth is 16Bpp when it is really 15Bpp */
106
    }
107

    
108
    switch (depth) {
109
        case 8  : avctx->pix_fmt = PIX_FMT_PAL8; break;
110
        case 15 : avctx->pix_fmt = PIX_FMT_RGB555; break;
111
        case 16 : avctx->pix_fmt = PIX_FMT_RGB565; break;
112
        case 24 : avctx->pix_fmt = PIX_FMT_BGR24; /* Supposedly BGR, but havent any files to test with */
113
                  av_log(avctx, AV_LOG_ERROR, "24Bpp FLC/FLX is unsupported due to no test files.\n");
114
                  return -1;
115
                  break;
116
        default :
117
                  av_log(avctx, AV_LOG_ERROR, "Unknown FLC/FLX depth of %d Bpp is unsupported.\n",depth);
118
                  return -1;
119
    }
120

    
121
    s->frame.data[0] = NULL;
122
    s->new_palette = 0;
123

    
124
    return 0;
125
}
126

    
127
static int flic_decode_frame_8BPP(AVCodecContext *avctx,
128
                                  void *data, int *data_size,
129
                                  const uint8_t *buf, int buf_size)
130
{
131
    FlicDecodeContext *s = avctx->priv_data;
132

    
133
    int stream_ptr = 0;
134
    int stream_ptr_after_color_chunk;
135
    int pixel_ptr;
136
    int palette_ptr;
137
    unsigned char palette_idx1;
138
    unsigned char palette_idx2;
139

    
140
    unsigned int frame_size;
141
    int num_chunks;
142

    
143
    unsigned int chunk_size;
144
    int chunk_type;
145

    
146
    int i, j;
147

    
148
    int color_packets;
149
    int color_changes;
150
    int color_shift;
151
    unsigned char r, g, b;
152

    
153
    int lines;
154
    int compressed_lines;
155
    int starting_line;
156
    signed short line_packets;
157
    int y_ptr;
158
    int byte_run;
159
    int pixel_skip;
160
    int pixel_countdown;
161
    unsigned char *pixels;
162
    int pixel_limit;
163

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

    
171
    pixels = s->frame.data[0];
172
    pixel_limit = s->avctx->height * s->frame.linesize[0];
173

    
174
    frame_size = AV_RL32(&buf[stream_ptr]);
175
    stream_ptr += 6;  /* skip the magic number */
176
    num_chunks = AV_RL16(&buf[stream_ptr]);
177
    stream_ptr += 10;  /* skip padding */
178

    
179
    frame_size -= 16;
180

    
181
    /* iterate through the chunks */
182
    while ((frame_size > 0) && (num_chunks > 0)) {
183
        chunk_size = AV_RL32(&buf[stream_ptr]);
184
        stream_ptr += 4;
185
        chunk_type = AV_RL16(&buf[stream_ptr]);
186
        stream_ptr += 2;
187

    
188
        switch (chunk_type) {
189
        case FLI_256_COLOR:
190
        case FLI_COLOR:
191
            stream_ptr_after_color_chunk = stream_ptr + chunk_size - 6;
192

    
193
            /* check special case: If this file is from the Magic Carpet
194
             * game and uses 6-bit colors even though it reports 256-color
195
             * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
196
             * initialization) */
197
            if ((chunk_type == FLI_256_COLOR) && (s->fli_type != FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE))
198
                color_shift = 0;
199
            else
200
                color_shift = 2;
201
            /* set up the palette */
202
            color_packets = AV_RL16(&buf[stream_ptr]);
203
            stream_ptr += 2;
204
            palette_ptr = 0;
205
            for (i = 0; i < color_packets; i++) {
206
                /* first byte is how many colors to skip */
207
                palette_ptr += buf[stream_ptr++];
208

    
209
                /* next byte indicates how many entries to change */
210
                color_changes = buf[stream_ptr++];
211

    
212
                /* if there are 0 color changes, there are actually 256 */
213
                if (color_changes == 0)
214
                    color_changes = 256;
215

    
216
                for (j = 0; j < color_changes; j++) {
217
                    unsigned int entry;
218

    
219
                    /* wrap around, for good measure */
220
                    if ((unsigned)palette_ptr >= 256)
221
                        palette_ptr = 0;
222

    
223
                    r = buf[stream_ptr++] << color_shift;
224
                    g = buf[stream_ptr++] << color_shift;
225
                    b = buf[stream_ptr++] << color_shift;
226
                    entry = (r << 16) | (g << 8) | b;
227
                    if (s->palette[palette_ptr] != entry)
228
                        s->new_palette = 1;
229
                    s->palette[palette_ptr++] = entry;
230
                }
231
            }
232

    
233
            /* color chunks sometimes have weird 16-bit alignment issues;
234
             * therefore, take the hardline approach and set the stream_ptr
235
             * to the value calculated w.r.t. the size specified by the color
236
             * chunk header */
237
            stream_ptr = stream_ptr_after_color_chunk;
238

    
239
            break;
240

    
241
        case FLI_DELTA:
242
            y_ptr = 0;
243
            compressed_lines = AV_RL16(&buf[stream_ptr]);
244
            stream_ptr += 2;
245
            while (compressed_lines > 0) {
246
                line_packets = AV_RL16(&buf[stream_ptr]);
247
                stream_ptr += 2;
248
                if ((line_packets & 0xC000) == 0xC000) {
249
                    // line skip opcode
250
                    line_packets = -line_packets;
251
                    y_ptr += line_packets * s->frame.linesize[0];
252
                } else if ((line_packets & 0xC000) == 0x4000) {
253
                    av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);
254
                } else if ((line_packets & 0xC000) == 0x8000) {
255
                    // "last byte" opcode
256
                    pixels[y_ptr + s->frame.linesize[0] - 1] = line_packets & 0xff;
257
                } else {
258
                    compressed_lines--;
259
                    pixel_ptr = y_ptr;
260
                    pixel_countdown = s->avctx->width;
261
                    for (i = 0; i < line_packets; i++) {
262
                        /* account for the skip bytes */
263
                        pixel_skip = buf[stream_ptr++];
264
                        pixel_ptr += pixel_skip;
265
                        pixel_countdown -= pixel_skip;
266
                        byte_run = (signed char)(buf[stream_ptr++]);
267
                        if (byte_run < 0) {
268
                            byte_run = -byte_run;
269
                            palette_idx1 = buf[stream_ptr++];
270
                            palette_idx2 = buf[stream_ptr++];
271
                            CHECK_PIXEL_PTR(byte_run);
272
                            for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
273
                                pixels[pixel_ptr++] = palette_idx1;
274
                                pixels[pixel_ptr++] = palette_idx2;
275
                            }
276
                        } else {
277
                            CHECK_PIXEL_PTR(byte_run * 2);
278
                            for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
279
                                palette_idx1 = buf[stream_ptr++];
280
                                pixels[pixel_ptr++] = palette_idx1;
281
                            }
282
                        }
283
                    }
284

    
285
                    y_ptr += s->frame.linesize[0];
286
                }
287
            }
288
            break;
289

    
290
        case FLI_LC:
291
            /* line compressed */
292
            starting_line = AV_RL16(&buf[stream_ptr]);
293
            stream_ptr += 2;
294
            y_ptr = 0;
295
            y_ptr += starting_line * s->frame.linesize[0];
296

    
297
            compressed_lines = AV_RL16(&buf[stream_ptr]);
298
            stream_ptr += 2;
299
            while (compressed_lines > 0) {
300
                pixel_ptr = y_ptr;
301
                pixel_countdown = s->avctx->width;
302
                line_packets = buf[stream_ptr++];
303
                if (line_packets > 0) {
304
                    for (i = 0; i < line_packets; i++) {
305
                        /* account for the skip bytes */
306
                        pixel_skip = buf[stream_ptr++];
307
                        pixel_ptr += pixel_skip;
308
                        pixel_countdown -= pixel_skip;
309
                        byte_run = (signed char)(buf[stream_ptr++]);
310
                        if (byte_run > 0) {
311
                            CHECK_PIXEL_PTR(byte_run);
312
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
313
                                palette_idx1 = buf[stream_ptr++];
314
                                pixels[pixel_ptr++] = palette_idx1;
315
                            }
316
                        } else if (byte_run < 0) {
317
                            byte_run = -byte_run;
318
                            palette_idx1 = buf[stream_ptr++];
319
                            CHECK_PIXEL_PTR(byte_run);
320
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
321
                                pixels[pixel_ptr++] = palette_idx1;
322
                            }
323
                        }
324
                    }
325
                }
326

    
327
                y_ptr += s->frame.linesize[0];
328
                compressed_lines--;
329
            }
330
            break;
331

    
332
        case FLI_BLACK:
333
            /* set the whole frame to color 0 (which is usually black) */
334
            memset(pixels, 0,
335
                s->frame.linesize[0] * s->avctx->height);
336
            break;
337

    
338
        case FLI_BRUN:
339
            /* Byte run compression: This chunk type only occurs in the first
340
             * FLI frame and it will update the entire frame. */
341
            y_ptr = 0;
342
            for (lines = 0; lines < s->avctx->height; lines++) {
343
                pixel_ptr = y_ptr;
344
                /* disregard the line packets; instead, iterate through all
345
                 * pixels on a row */
346
                stream_ptr++;
347
                pixel_countdown = s->avctx->width;
348
                while (pixel_countdown > 0) {
349
                    byte_run = (signed char)(buf[stream_ptr++]);
350
                    if (byte_run > 0) {
351
                        palette_idx1 = buf[stream_ptr++];
352
                        CHECK_PIXEL_PTR(byte_run);
353
                        for (j = 0; j < byte_run; j++) {
354
                            pixels[pixel_ptr++] = palette_idx1;
355
                            pixel_countdown--;
356
                            if (pixel_countdown < 0)
357
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
358
                                       pixel_countdown, lines);
359
                        }
360
                    } else {  /* copy bytes if byte_run < 0 */
361
                        byte_run = -byte_run;
362
                        CHECK_PIXEL_PTR(byte_run);
363
                        for (j = 0; j < byte_run; j++) {
364
                            palette_idx1 = buf[stream_ptr++];
365
                            pixels[pixel_ptr++] = palette_idx1;
366
                            pixel_countdown--;
367
                            if (pixel_countdown < 0)
368
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
369
                                       pixel_countdown, lines);
370
                        }
371
                    }
372
                }
373

    
374
                y_ptr += s->frame.linesize[0];
375
            }
376
            break;
377

    
378
        case FLI_COPY:
379
            /* copy the chunk (uncompressed frame) */
380
            if (chunk_size - 6 > s->avctx->width * s->avctx->height) {
381
                av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
382
                       "bigger than image, skipping chunk\n", chunk_size - 6);
383
                stream_ptr += chunk_size - 6;
384
            } else {
385
                for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
386
                     y_ptr += s->frame.linesize[0]) {
387
                    memcpy(&pixels[y_ptr], &buf[stream_ptr],
388
                        s->avctx->width);
389
                    stream_ptr += s->avctx->width;
390
                }
391
            }
392
            break;
393

    
394
        case FLI_MINI:
395
            /* some sort of a thumbnail? disregard this chunk... */
396
            stream_ptr += chunk_size - 6;
397
            break;
398

    
399
        default:
400
            av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
401
            break;
402
        }
403

    
404
        frame_size -= chunk_size;
405
        num_chunks--;
406
    }
407

    
408
    /* by the end of the chunk, the stream ptr should equal the frame
409
     * size (minus 1, possibly); if it doesn't, issue a warning */
410
    if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
411
        av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
412
               "and final chunk ptr = %d\n", buf_size, stream_ptr);
413

    
414
    /* make the palette available on the way out */
415
    memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
416
    if (s->new_palette) {
417
        s->frame.palette_has_changed = 1;
418
        s->new_palette = 0;
419
    }
420

    
421
    *data_size=sizeof(AVFrame);
422
    *(AVFrame*)data = s->frame;
423

    
424
    return buf_size;
425
}
426

    
427
static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
428
                                      void *data, int *data_size,
429
                                      const uint8_t *buf, int buf_size)
430
{
431
    /* Note, the only difference between the 15Bpp and 16Bpp */
432
    /* Format is the pixel format, the packets are processed the same. */
433
    FlicDecodeContext *s = avctx->priv_data;
434

    
435
    int stream_ptr = 0;
436
    int pixel_ptr;
437
    unsigned char palette_idx1;
438

    
439
    unsigned int frame_size;
440
    int num_chunks;
441

    
442
    unsigned int chunk_size;
443
    int chunk_type;
444

    
445
    int i, j;
446

    
447
    int lines;
448
    int compressed_lines;
449
    signed short line_packets;
450
    int y_ptr;
451
    int byte_run;
452
    int pixel_skip;
453
    int pixel_countdown;
454
    unsigned char *pixels;
455
    int pixel;
456
    int pixel_limit;
457

    
458
    s->frame.reference = 1;
459
    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
460
    if (avctx->reget_buffer(avctx, &s->frame) < 0) {
461
        av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
462
        return -1;
463
    }
464

    
465
    pixels = s->frame.data[0];
466
    pixel_limit = s->avctx->height * s->frame.linesize[0];
467

    
468
    frame_size = AV_RL32(&buf[stream_ptr]);
469
    stream_ptr += 6;  /* skip the magic number */
470
    num_chunks = AV_RL16(&buf[stream_ptr]);
471
    stream_ptr += 10;  /* skip padding */
472

    
473
    frame_size -= 16;
474

    
475
    /* iterate through the chunks */
476
    while ((frame_size > 0) && (num_chunks > 0)) {
477
        chunk_size = AV_RL32(&buf[stream_ptr]);
478
        stream_ptr += 4;
479
        chunk_type = AV_RL16(&buf[stream_ptr]);
480
        stream_ptr += 2;
481

    
482
        switch (chunk_type) {
483
        case FLI_256_COLOR:
484
        case FLI_COLOR:
485
            /* For some reason, it seems that non-palettized flics do
486
             * include one of these chunks in their first frame.
487
             * Why I do not know, it seems rather extraneous. */
488
/*            av_log(avctx, AV_LOG_ERROR, "Unexpected Palette chunk %d in non-paletised FLC\n",chunk_type);*/
489
            stream_ptr = stream_ptr + chunk_size - 6;
490
            break;
491

    
492
        case FLI_DELTA:
493
        case FLI_DTA_LC:
494
            y_ptr = 0;
495
            compressed_lines = AV_RL16(&buf[stream_ptr]);
496
            stream_ptr += 2;
497
            while (compressed_lines > 0) {
498
                line_packets = AV_RL16(&buf[stream_ptr]);
499
                stream_ptr += 2;
500
                if (line_packets < 0) {
501
                    line_packets = -line_packets;
502
                    y_ptr += line_packets * s->frame.linesize[0];
503
                } else {
504
                    compressed_lines--;
505
                    pixel_ptr = y_ptr;
506
                    pixel_countdown = s->avctx->width;
507
                    for (i = 0; i < line_packets; i++) {
508
                        /* account for the skip bytes */
509
                        pixel_skip = buf[stream_ptr++];
510
                        pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
511
                        pixel_countdown -= pixel_skip;
512
                        byte_run = (signed char)(buf[stream_ptr++]);
513
                        if (byte_run < 0) {
514
                            byte_run = -byte_run;
515
                            pixel    = AV_RL16(&buf[stream_ptr]);
516
                            stream_ptr += 2;
517
                            CHECK_PIXEL_PTR(byte_run);
518
                            for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
519
                                *((signed short*)(&pixels[pixel_ptr])) = pixel;
520
                                pixel_ptr += 2;
521
                            }
522
                        } else {
523
                            CHECK_PIXEL_PTR(byte_run);
524
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
525
                                *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[stream_ptr]);
526
                                stream_ptr += 2;
527
                                pixel_ptr += 2;
528
                            }
529
                        }
530
                    }
531

    
532
                    y_ptr += s->frame.linesize[0];
533
                }
534
            }
535
            break;
536

    
537
        case FLI_LC:
538
            av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-paletised FLC\n");
539
            stream_ptr = stream_ptr + chunk_size - 6;
540
            break;
541

    
542
        case FLI_BLACK:
543
            /* set the whole frame to 0x0000 which is black in both 15Bpp and 16Bpp modes. */
544
            memset(pixels, 0x0000,
545
                   s->frame.linesize[0] * s->avctx->height);
546
            break;
547

    
548
        case FLI_BRUN:
549
            y_ptr = 0;
550
            for (lines = 0; lines < s->avctx->height; lines++) {
551
                pixel_ptr = y_ptr;
552
                /* disregard the line packets; instead, iterate through all
553
                 * pixels on a row */
554
                stream_ptr++;
555
                pixel_countdown = (s->avctx->width * 2);
556

    
557
                while (pixel_countdown > 0) {
558
                    byte_run = (signed char)(buf[stream_ptr++]);
559
                    if (byte_run > 0) {
560
                        palette_idx1 = buf[stream_ptr++];
561
                        CHECK_PIXEL_PTR(byte_run);
562
                        for (j = 0; j < byte_run; j++) {
563
                            pixels[pixel_ptr++] = palette_idx1;
564
                            pixel_countdown--;
565
                            if (pixel_countdown < 0)
566
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) (linea%d)\n",
567
                                       pixel_countdown, lines);
568
                        }
569
                    } else {  /* copy bytes if byte_run < 0 */
570
                        byte_run = -byte_run;
571
                        CHECK_PIXEL_PTR(byte_run);
572
                        for (j = 0; j < byte_run; j++) {
573
                            palette_idx1 = buf[stream_ptr++];
574
                            pixels[pixel_ptr++] = palette_idx1;
575
                            pixel_countdown--;
576
                            if (pixel_countdown < 0)
577
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d) at line %d\n",
578
                                       pixel_countdown, lines);
579
                        }
580
                    }
581
                }
582

    
583
                /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
584
                 * This does not give us any good oportunity to perform word endian conversion
585
                 * during decompression. So if it is required (i.e., this is not a LE target, we do
586
                 * a second pass over the line here, swapping the bytes.
587
                 */
588
#if HAVE_BIGENDIAN
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
#endif
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
                                   const 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
                             AVPacket *avpkt)
704
{
705
    const uint8_t *buf = avpkt->data;
706
    int buf_size = avpkt->size;
707
    if (avctx->pix_fmt == PIX_FMT_PAL8) {
708
      return flic_decode_frame_8BPP(avctx, data, data_size,
709
                                    buf, buf_size);
710
    }
711
    else if ((avctx->pix_fmt == PIX_FMT_RGB555) ||
712
             (avctx->pix_fmt == PIX_FMT_RGB565)) {
713
      return flic_decode_frame_15_16BPP(avctx, data, data_size,
714
                                        buf, buf_size);
715
    }
716
    else if (avctx->pix_fmt == PIX_FMT_BGR24) {
717
      return flic_decode_frame_24BPP(avctx, data, data_size,
718
                                     buf, buf_size);
719
    }
720

    
721
    /* Should not get  here, ever as the pix_fmt is processed */
722
    /* in flic_decode_init and the above if should deal with */
723
    /* the finite set of possibilites allowable by here. */
724
    /* But in case we do, just error out. */
725
    av_log(avctx, AV_LOG_ERROR, "Unknown FLC format, my science cannot explain how this happened.\n");
726
    return -1;
727
}
728

    
729

    
730
static av_cold int flic_decode_end(AVCodecContext *avctx)
731
{
732
    FlicDecodeContext *s = avctx->priv_data;
733

    
734
    if (s->frame.data[0])
735
        avctx->release_buffer(avctx, &s->frame);
736

    
737
    return 0;
738
}
739

    
740
AVCodec flic_decoder = {
741
    "flic",
742
    AVMEDIA_TYPE_VIDEO,
743
    CODEC_ID_FLIC,
744
    sizeof(FlicDecodeContext),
745
    flic_decode_init,
746
    NULL,
747
    flic_decode_end,
748
    flic_decode_frame,
749
    CODEC_CAP_DR1,
750
    NULL,
751
    NULL,
752
    NULL,
753
    NULL,
754
    .long_name = NULL_IF_CONFIG_SMALL("Autodesk Animator Flic video"),
755
};