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/*
2
 * FLI/FLC Animation Video Decoder
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 * Copyright (C) 2003, 2004 the ffmpeg project
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
11
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12
 * 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 this library; 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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 */
20

    
21
/**
22
 * @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
28
 *
29
 * This decoder outputs PAL8/RGB555/RGB565 and maybe one day RGB24
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 * colorspace data, depending on the FLC. To use this decoder, be
31
 * 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
33
 * large. The only exception is for FLI files from the game "Magic Carpet",
34
 * in which the header is only 12 bytes.
35
 */
36

    
37
#include <stdio.h>
38
#include <stdlib.h>
39
#include <string.h>
40
#include <unistd.h>
41

    
42
#include "common.h"
43
#include "avcodec.h"
44
#include "bswap.h"
45

    
46
#define FLI_256_COLOR 4
47
#define FLI_DELTA     7
48
#define FLI_COLOR     11
49
#define FLI_LC        12
50
#define FLI_BLACK     13
51
#define FLI_BRUN      15
52
#define FLI_COPY      16
53
#define FLI_MINI      18
54
#define FLI_DTA_BRUN  25
55
#define FLI_DTA_COPY  26
56
#define FLI_DTA_LC    27
57

    
58
#define FLI_TYPE_CODE     (0xAF11)
59
#define FLC_FLX_TYPE_CODE (0xAF12)
60
#define FLC_DTA_TYPE_CODE (0xAF44) /* Marks an "Extended FLC" comes from Dave's Targa Animator (DTA) */
61
#define FLC_MAGIC_CARPET_SYNTHETIC_TYPE_CODE (0xAF13)
62

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

    
70
typedef struct FlicDecodeContext {
71
    AVCodecContext *avctx;
72
    AVFrame frame;
73

    
74
    unsigned int palette[256];
75
    int new_palette;
76
    int fli_type;  /* either 0xAF11 or 0xAF12, affects palette resolution */
77
} FlicDecodeContext;
78

    
79
static int flic_decode_init(AVCodecContext *avctx)
80
{
81
    FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
82
    unsigned char *fli_header = (unsigned char *)avctx->extradata;
83
    int depth;
84

    
85
    s->avctx = avctx;
86
    avctx->has_b_frames = 0;
87

    
88
    s->fli_type = LE_16(&fli_header[4]); /* Might be overridden if a Magic Carpet FLC */
89
    depth       = LE_16(&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, "Unkown 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 = (FlicDecodeContext *)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
    signed char 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 = LE_32(&buf[stream_ptr]);
174
    stream_ptr += 6;  /* skip the magic number */
175
    num_chunks = LE_16(&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 = LE_32(&buf[stream_ptr]);
183
        stream_ptr += 4;
184
        chunk_type = LE_16(&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
            s->new_palette = 1;
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 = LE_16(&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

    
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
                    s->palette[palette_ptr++] = (r << 16) | (g << 8) | b;
226
                }
227
            }
228

    
229
            /* color chunks sometimes have weird 16-bit alignment issues;
230
             * therefore, take the hardline approach and set the stream_ptr
231
             * to the value calculated w.r.t. the size specified by the color
232
             * chunk header */
233
            stream_ptr = stream_ptr_after_color_chunk;
234

    
235
            break;
236

    
237
        case FLI_DELTA:
238
            y_ptr = 0;
239
            compressed_lines = LE_16(&buf[stream_ptr]);
240
            stream_ptr += 2;
241
            while (compressed_lines > 0) {
242
                line_packets = LE_16(&buf[stream_ptr]);
243
                stream_ptr += 2;
244
                if (line_packets < 0) {
245
                    line_packets = -line_packets;
246
                    y_ptr += line_packets * s->frame.linesize[0];
247
                } else {
248
                    compressed_lines--;
249
                    pixel_ptr = y_ptr;
250
                    pixel_countdown = s->avctx->width;
251
                    for (i = 0; i < line_packets; i++) {
252
                        /* account for the skip bytes */
253
                        pixel_skip = buf[stream_ptr++];
254
                        pixel_ptr += pixel_skip;
255
                        pixel_countdown -= pixel_skip;
256
                        byte_run = buf[stream_ptr++];
257
                        if (byte_run < 0) {
258
                            byte_run = -byte_run;
259
                            palette_idx1 = buf[stream_ptr++];
260
                            palette_idx2 = buf[stream_ptr++];
261
                            CHECK_PIXEL_PTR(byte_run);
262
                            for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
263
                                pixels[pixel_ptr++] = palette_idx1;
264
                                pixels[pixel_ptr++] = palette_idx2;
265
                            }
266
                        } else {
267
                            CHECK_PIXEL_PTR(byte_run * 2);
268
                            for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
269
                                palette_idx1 = buf[stream_ptr++];
270
                                pixels[pixel_ptr++] = palette_idx1;
271
                            }
272
                        }
273
                    }
274

    
275
                    y_ptr += s->frame.linesize[0];
276
                }
277
            }
278
            break;
279

    
280
        case FLI_LC:
281
            /* line compressed */
282
            starting_line = LE_16(&buf[stream_ptr]);
283
            stream_ptr += 2;
284
            y_ptr = 0;
285
            y_ptr += starting_line * s->frame.linesize[0];
286

    
287
            compressed_lines = LE_16(&buf[stream_ptr]);
288
            stream_ptr += 2;
289
            while (compressed_lines > 0) {
290
                pixel_ptr = y_ptr;
291
                pixel_countdown = s->avctx->width;
292
                line_packets = buf[stream_ptr++];
293
                if (line_packets > 0) {
294
                    for (i = 0; i < line_packets; i++) {
295
                        /* account for the skip bytes */
296
                        pixel_skip = buf[stream_ptr++];
297
                        pixel_ptr += pixel_skip;
298
                        pixel_countdown -= pixel_skip;
299
                        byte_run = buf[stream_ptr++];
300
                        if (byte_run > 0) {
301
                            CHECK_PIXEL_PTR(byte_run);
302
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
303
                                palette_idx1 = buf[stream_ptr++];
304
                                pixels[pixel_ptr++] = palette_idx1;
305
                            }
306
                        } else {
307
                            byte_run = -byte_run;
308
                            palette_idx1 = buf[stream_ptr++];
309
                            CHECK_PIXEL_PTR(byte_run);
310
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
311
                                pixels[pixel_ptr++] = palette_idx1;
312
                            }
313
                        }
314
                    }
315
                }
316

    
317
                y_ptr += s->frame.linesize[0];
318
                compressed_lines--;
319
            }
320
            break;
321

    
322
        case FLI_BLACK:
323
            /* set the whole frame to color 0 (which is usually black) */
324
            memset(pixels, 0,
325
                s->frame.linesize[0] * s->avctx->height);
326
            break;
327

    
328
        case FLI_BRUN:
329
            /* Byte run compression: This chunk type only occurs in the first
330
             * FLI frame and it will update the entire frame. */
331
            y_ptr = 0;
332
            for (lines = 0; lines < s->avctx->height; lines++) {
333
                pixel_ptr = y_ptr;
334
                /* disregard the line packets; instead, iterate through all
335
                 * pixels on a row */
336
                stream_ptr++;
337
                pixel_countdown = s->avctx->width;
338
                while (pixel_countdown > 0) {
339
                    byte_run = buf[stream_ptr++];
340
                    if (byte_run > 0) {
341
                        palette_idx1 = buf[stream_ptr++];
342
                        CHECK_PIXEL_PTR(byte_run);
343
                        for (j = 0; j < byte_run; j++) {
344
                            pixels[pixel_ptr++] = palette_idx1;
345
                            pixel_countdown--;
346
                            if (pixel_countdown < 0)
347
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
348
                                       pixel_countdown);
349
                        }
350
                    } else {  /* copy bytes if byte_run < 0 */
351
                        byte_run = -byte_run;
352
                        CHECK_PIXEL_PTR(byte_run);
353
                        for (j = 0; j < byte_run; j++) {
354
                            palette_idx1 = buf[stream_ptr++];
355
                            pixels[pixel_ptr++] = palette_idx1;
356
                            pixel_countdown--;
357
                            if (pixel_countdown < 0)
358
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
359
                                       pixel_countdown);
360
                        }
361
                    }
362
                }
363

    
364
                y_ptr += s->frame.linesize[0];
365
            }
366
            break;
367

    
368
        case FLI_COPY:
369
            /* copy the chunk (uncompressed frame) */
370
            if (chunk_size - 6 > s->avctx->width * s->avctx->height) {
371
                av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
372
                       "bigger than image, skipping chunk\n", chunk_size - 6);
373
                stream_ptr += chunk_size - 6;
374
            } else {
375
                for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
376
                     y_ptr += s->frame.linesize[0]) {
377
                    memcpy(&pixels[y_ptr], &buf[stream_ptr],
378
                        s->avctx->width);
379
                    stream_ptr += s->avctx->width;
380
                }
381
            }
382
            break;
383

    
384
        case FLI_MINI:
385
            /* some sort of a thumbnail? disregard this chunk... */
386
            stream_ptr += chunk_size - 6;
387
            break;
388

    
389
        default:
390
            av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
391
            break;
392
        }
393

    
394
        frame_size -= chunk_size;
395
        num_chunks--;
396
    }
397

    
398
    /* by the end of the chunk, the stream ptr should equal the frame
399
     * size (minus 1, possibly); if it doesn't, issue a warning */
400
    if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
401
        av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
402
               "and final chunk ptr = %d\n", buf_size, stream_ptr);
403

    
404
    /* make the palette available on the way out */
405
//    if (s->new_palette) {
406
    if (1) {
407
        memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
408
        s->frame.palette_has_changed = 1;
409
        s->new_palette = 0;
410
    }
411

    
412
    *data_size=sizeof(AVFrame);
413
    *(AVFrame*)data = s->frame;
414

    
415
    return buf_size;
416
}
417

    
418
static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
419
                                      void *data, int *data_size,
420
                                      uint8_t *buf, int buf_size)
421
{
422
    /* Note, the only difference between the 15Bpp and 16Bpp */
423
    /* Format is the pixel format, the packets are processed the same. */
424
    FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
425

    
426
    int stream_ptr = 0;
427
    int pixel_ptr;
428
    unsigned char palette_idx1;
429

    
430
    unsigned int frame_size;
431
    int num_chunks;
432

    
433
    unsigned int chunk_size;
434
    int chunk_type;
435

    
436
    int i, j;
437

    
438
    int lines;
439
    int compressed_lines;
440
    signed short line_packets;
441
    int y_ptr;
442
    signed char byte_run;
443
    int pixel_skip;
444
    int pixel_countdown;
445
    unsigned char *pixels;
446
    int pixel;
447
    int pixel_limit;
448

    
449
    s->frame.reference = 1;
450
    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
451
    if (avctx->reget_buffer(avctx, &s->frame) < 0) {
452
        av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
453
        return -1;
454
    }
455

    
456
    pixels = s->frame.data[0];
457
    pixel_limit = s->avctx->height * s->frame.linesize[0];
458

    
459
    frame_size = LE_32(&buf[stream_ptr]);
460
    stream_ptr += 6;  /* skip the magic number */
461
    num_chunks = LE_16(&buf[stream_ptr]);
462
    stream_ptr += 10;  /* skip padding */
463

    
464
    frame_size -= 16;
465

    
466
    /* iterate through the chunks */
467
    while ((frame_size > 0) && (num_chunks > 0)) {
468
        chunk_size = LE_32(&buf[stream_ptr]);
469
        stream_ptr += 4;
470
        chunk_type = LE_16(&buf[stream_ptr]);
471
        stream_ptr += 2;
472

    
473
        switch (chunk_type) {
474
        case FLI_256_COLOR:
475
        case FLI_COLOR:
476
            /* For some reason, it seems that non-paletised flics do include one of these */
477
            /* chunks in their first frame.  Why i do not know, it seems rather extraneous */
478
/*            av_log(avctx, AV_LOG_ERROR, "Unexpected Palette chunk %d in non-paletised FLC\n",chunk_type);*/
479
            stream_ptr = stream_ptr + chunk_size - 6;
480
            break;
481

    
482
        case FLI_DELTA:
483
        case FLI_DTA_LC:
484
            y_ptr = 0;
485
            compressed_lines = LE_16(&buf[stream_ptr]);
486
            stream_ptr += 2;
487
            while (compressed_lines > 0) {
488
                line_packets = LE_16(&buf[stream_ptr]);
489
                stream_ptr += 2;
490
                if (line_packets < 0) {
491
                    line_packets = -line_packets;
492
                    y_ptr += line_packets * s->frame.linesize[0];
493
                } else {
494
                    compressed_lines--;
495
                    pixel_ptr = y_ptr;
496
                    pixel_countdown = s->avctx->width;
497
                    for (i = 0; i < line_packets; i++) {
498
                        /* account for the skip bytes */
499
                        pixel_skip = buf[stream_ptr++];
500
                        pixel_ptr += (pixel_skip*2); /* Pixel is 2 bytes wide */
501
                        pixel_countdown -= pixel_skip;
502
                        byte_run = buf[stream_ptr++];
503
                        if (byte_run < 0) {
504
                            byte_run = -byte_run;
505
                            pixel    = LE_16(&buf[stream_ptr]);
506
                            stream_ptr += 2;
507
                            CHECK_PIXEL_PTR(byte_run);
508
                            for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
509
                                *((signed short*)(&pixels[pixel_ptr])) = pixel;
510
                                pixel_ptr += 2;
511
                            }
512
                        } else {
513
                            CHECK_PIXEL_PTR(byte_run);
514
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
515
                                *((signed short*)(&pixels[pixel_ptr])) = LE_16(&buf[stream_ptr]);
516
                                stream_ptr += 2;
517
                                pixel_ptr += 2;
518
                            }
519
                        }
520
                    }
521

    
522
                    y_ptr += s->frame.linesize[0];
523
                }
524
            }
525
            break;
526

    
527
        case FLI_LC:
528
            av_log(avctx, AV_LOG_ERROR, "Unexpected FLI_LC chunk in non-paletised FLC\n");
529
            stream_ptr = stream_ptr + chunk_size - 6;
530
            break;
531

    
532
        case FLI_BLACK:
533
            /* set the whole frame to 0x0000 which is balck in both 15Bpp and 16Bpp modes. */
534
            memset(pixels, 0x0000,
535
                   s->frame.linesize[0] * s->avctx->height * 2);
536
            break;
537

    
538
        case FLI_BRUN:
539
            y_ptr = 0;
540
            for (lines = 0; lines < s->avctx->height; lines++) {
541
                pixel_ptr = y_ptr;
542
                /* disregard the line packets; instead, iterate through all
543
                 * pixels on a row */
544
                stream_ptr++;
545
                pixel_countdown = (s->avctx->width * 2);
546

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

    
573
                /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
574
                 * This doesnt give us any good oportunity to perform word endian conversion
575
                 * during decompression. So if its requried (ie, this isnt a LE target, we do
576
                 * a second pass over the line here, swapping the bytes.
577
                 */
578
                pixel = 0xFF00;
579
                if (0xFF00 != LE_16(&pixel)) /* Check if its not an LE Target */
580
                {
581
                  pixel_ptr = y_ptr;
582
                  pixel_countdown = s->avctx->width;
583
                  while (pixel_countdown > 0) {
584
                    *((signed short*)(&pixels[pixel_ptr])) = LE_16(&buf[pixel_ptr]);
585
                    pixel_ptr += 2;
586
                  }
587
                }
588
                y_ptr += s->frame.linesize[0];
589
            }
590
            break;
591

    
592
        case FLI_DTA_BRUN:
593
            y_ptr = 0;
594
            for (lines = 0; lines < s->avctx->height; lines++) {
595
                pixel_ptr = y_ptr;
596
                /* disregard the line packets; instead, iterate through all
597
                 * pixels on a row */
598
                stream_ptr++;
599
                pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
600

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

    
630
                y_ptr += s->frame.linesize[0];
631
            }
632
            break;
633

    
634
        case FLI_COPY:
635
        case FLI_DTA_COPY:
636
            /* copy the chunk (uncompressed frame) */
637
            if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {
638
                av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
639
                       "bigger than image, skipping chunk\n", chunk_size - 6);
640
                stream_ptr += chunk_size - 6;
641
            } else {
642

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

    
646
                    pixel_countdown = s->avctx->width;
647
                    pixel_ptr = 0;
648
                    while (pixel_countdown > 0) {
649
                      *((signed short*)(&pixels[y_ptr + pixel_ptr])) = LE_16(&buf[stream_ptr+pixel_ptr]);
650
                      pixel_ptr += 2;
651
                      pixel_countdown--;
652
                    }
653
                    stream_ptr += s->avctx->width*2;
654
                }
655
            }
656
            break;
657

    
658
        case FLI_MINI:
659
            /* some sort of a thumbnail? disregard this chunk... */
660
            stream_ptr += chunk_size - 6;
661
            break;
662

    
663
        default:
664
            av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
665
            break;
666
        }
667

    
668
        frame_size -= chunk_size;
669
        num_chunks--;
670
    }
671

    
672
    /* by the end of the chunk, the stream ptr should equal the frame
673
     * size (minus 1, possibly); if it doesn't, issue a warning */
674
    if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
675
        av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
676
               "and final chunk ptr = %d\n", buf_size, stream_ptr);
677

    
678

    
679
    *data_size=sizeof(AVFrame);
680
    *(AVFrame*)data = s->frame;
681

    
682
    return buf_size;
683
}
684

    
685
static int flic_decode_frame_24BPP(AVCodecContext *avctx,
686
                                   void *data, int *data_size,
687
                                   uint8_t *buf, int buf_size)
688
{
689
  av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
690
  return -1;
691
}
692

    
693
static int flic_decode_frame(AVCodecContext *avctx,
694
                             void *data, int *data_size,
695
                             uint8_t *buf, int buf_size)
696
{
697
    if (avctx->pix_fmt == PIX_FMT_PAL8) {
698
      return flic_decode_frame_8BPP(avctx, data, data_size,
699
                                    buf, buf_size);
700
    }
701
    else if ((avctx->pix_fmt == PIX_FMT_RGB555) ||
702
             (avctx->pix_fmt == PIX_FMT_RGB565)) {
703
      return flic_decode_frame_15_16BPP(avctx, data, data_size,
704
                                        buf, buf_size);
705
    }
706
    else if (avctx->pix_fmt == PIX_FMT_BGR24) {
707
      return flic_decode_frame_24BPP(avctx, data, data_size,
708
                                     buf, buf_size);
709
    }
710

    
711
    /* Shouldnt get  here, ever as the pix_fmt is processed */
712
    /* in flic_decode_init and the above if should deal with */
713
    /* the finite set of possibilites allowable by here. */
714
    /* but in case we do, just error out. */
715
    av_log(avctx, AV_LOG_ERROR, "Unknown Format of FLC. My Science cant explain how this happened\n");
716
    return -1;
717
}
718

    
719

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

    
724
    if (s->frame.data[0])
725
        avctx->release_buffer(avctx, &s->frame);
726

    
727
    return 0;
728
}
729

    
730
AVCodec flic_decoder = {
731
    "flic",
732
    CODEC_TYPE_VIDEO,
733
    CODEC_ID_FLIC,
734
    sizeof(FlicDecodeContext),
735
    flic_decode_init,
736
    NULL,
737
    flic_decode_end,
738
    flic_decode_frame,
739
    CODEC_CAP_DR1,
740
    NULL,
741
    NULL,
742
    NULL,
743
    NULL
744
};