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ffmpeg / libavcodec / flicvideo.c @ fce2200d

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

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

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

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

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

    
65
#define CHECK_PIXEL_PTR(n) \
66
    if (pixel_ptr + n > pixel_limit) { \
67
        av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr >= pixel_limit (%d >= %d)\n", \
68
        pixel_ptr + n, pixel_limit); \
69
        return -1; \
70
    } \
71

    
72
typedef struct FlicDecodeContext {
73
    AVCodecContext *avctx;
74
    AVFrame frame;
75

    
76
    unsigned int palette[256];
77
    int new_palette;
78
    int fli_type;  /* either 0xAF11 or 0xAF12, affects palette resolution */
79
} FlicDecodeContext;
80

    
81
static int flic_decode_init(AVCodecContext *avctx)
82
{
83
    FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
84
    unsigned char *fli_header = (unsigned char *)avctx->extradata;
85
    int depth;
86

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

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

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

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

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

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

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

    
125
    return 0;
126
}
127

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

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

    
141
    unsigned int frame_size;
142
    int num_chunks;
143

    
144
    unsigned int chunk_size;
145
    int chunk_type;
146

    
147
    int i, j;
148

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

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

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

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

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

    
180
    frame_size -= 16;
181

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

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

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

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

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

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

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

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

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

    
240
            break;
241

    
242
        case FLI_DELTA:
243
            y_ptr = 0;
244
            compressed_lines = LE_16(&buf[stream_ptr]);
245
            stream_ptr += 2;
246
            while (compressed_lines > 0) {
247
                line_packets = LE_16(&buf[stream_ptr]);
248
                stream_ptr += 2;
249
                if ((line_packets & 0xC000) == 0xC000) {
250
                    // line skip opcode
251
                    line_packets = -line_packets;
252
                    y_ptr += line_packets * s->frame.linesize[0];
253
                } else if ((line_packets & 0xC000) == 0x4000) {
254
                    av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets);
255
                } else if ((line_packets & 0xC000) == 0x8000) {
256
                    // "last byte" opcode
257
                    pixels[y_ptr + s->frame.linesize[0] - 1] = line_packets & 0xff;
258
                } else {
259
                    compressed_lines--;
260
                    pixel_ptr = y_ptr;
261
                    pixel_countdown = s->avctx->width;
262
                    for (i = 0; i < line_packets; i++) {
263
                        /* account for the skip bytes */
264
                        pixel_skip = buf[stream_ptr++];
265
                        pixel_ptr += pixel_skip;
266
                        pixel_countdown -= pixel_skip;
267
                        byte_run = (signed char)(buf[stream_ptr++]);
268
                        if (byte_run < 0) {
269
                            byte_run = -byte_run;
270
                            palette_idx1 = buf[stream_ptr++];
271
                            palette_idx2 = buf[stream_ptr++];
272
                            CHECK_PIXEL_PTR(byte_run);
273
                            for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
274
                                pixels[pixel_ptr++] = palette_idx1;
275
                                pixels[pixel_ptr++] = palette_idx2;
276
                            }
277
                        } else {
278
                            CHECK_PIXEL_PTR(byte_run * 2);
279
                            for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
280
                                palette_idx1 = buf[stream_ptr++];
281
                                pixels[pixel_ptr++] = palette_idx1;
282
                            }
283
                        }
284
                    }
285

    
286
                    y_ptr += s->frame.linesize[0];
287
                }
288
            }
289
            break;
290

    
291
        case FLI_LC:
292
            /* line compressed */
293
            starting_line = LE_16(&buf[stream_ptr]);
294
            stream_ptr += 2;
295
            y_ptr = 0;
296
            y_ptr += starting_line * s->frame.linesize[0];
297

    
298
            compressed_lines = LE_16(&buf[stream_ptr]);
299
            stream_ptr += 2;
300
            while (compressed_lines > 0) {
301
                pixel_ptr = y_ptr;
302
                pixel_countdown = s->avctx->width;
303
                line_packets = buf[stream_ptr++];
304
                if (line_packets > 0) {
305
                    for (i = 0; i < line_packets; i++) {
306
                        /* account for the skip bytes */
307
                        pixel_skip = buf[stream_ptr++];
308
                        pixel_ptr += pixel_skip;
309
                        pixel_countdown -= pixel_skip;
310
                        byte_run = (signed char)(buf[stream_ptr++]);
311
                        if (byte_run > 0) {
312
                            CHECK_PIXEL_PTR(byte_run);
313
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
314
                                palette_idx1 = buf[stream_ptr++];
315
                                pixels[pixel_ptr++] = palette_idx1;
316
                            }
317
                        } else if (byte_run < 0) {
318
                            byte_run = -byte_run;
319
                            palette_idx1 = buf[stream_ptr++];
320
                            CHECK_PIXEL_PTR(byte_run);
321
                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
322
                                pixels[pixel_ptr++] = palette_idx1;
323
                            }
324
                        }
325
                    }
326
                }
327

    
328
                y_ptr += s->frame.linesize[0];
329
                compressed_lines--;
330
            }
331
            break;
332

    
333
        case FLI_BLACK:
334
            /* set the whole frame to color 0 (which is usually black) */
335
            memset(pixels, 0,
336
                s->frame.linesize[0] * s->avctx->height);
337
            break;
338

    
339
        case FLI_BRUN:
340
            /* Byte run compression: This chunk type only occurs in the first
341
             * FLI frame and it will update the entire frame. */
342
            y_ptr = 0;
343
            for (lines = 0; lines < s->avctx->height; lines++) {
344
                pixel_ptr = y_ptr;
345
                /* disregard the line packets; instead, iterate through all
346
                 * pixels on a row */
347
                stream_ptr++;
348
                pixel_countdown = s->avctx->width;
349
                while (pixel_countdown > 0) {
350
                    byte_run = (signed char)(buf[stream_ptr++]);
351
                    if (byte_run > 0) {
352
                        palette_idx1 = buf[stream_ptr++];
353
                        CHECK_PIXEL_PTR(byte_run);
354
                        for (j = 0; j < byte_run; j++) {
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
                    } else {  /* copy bytes if byte_run < 0 */
362
                        byte_run = -byte_run;
363
                        CHECK_PIXEL_PTR(byte_run);
364
                        for (j = 0; j < byte_run; j++) {
365
                            palette_idx1 = buf[stream_ptr++];
366
                            pixels[pixel_ptr++] = palette_idx1;
367
                            pixel_countdown--;
368
                            if (pixel_countdown < 0)
369
                                av_log(avctx, AV_LOG_ERROR, "pixel_countdown < 0 (%d)\n",
370
                                       pixel_countdown);
371
                        }
372
                    }
373
                }
374

    
375
                y_ptr += s->frame.linesize[0];
376
            }
377
            break;
378

    
379
        case FLI_COPY:
380
            /* copy the chunk (uncompressed frame) */
381
            if (chunk_size - 6 > s->avctx->width * s->avctx->height) {
382
                av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
383
                       "bigger than image, skipping chunk\n", chunk_size - 6);
384
                stream_ptr += chunk_size - 6;
385
            } else {
386
                for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
387
                     y_ptr += s->frame.linesize[0]) {
388
                    memcpy(&pixels[y_ptr], &buf[stream_ptr],
389
                        s->avctx->width);
390
                    stream_ptr += s->avctx->width;
391
                }
392
            }
393
            break;
394

    
395
        case FLI_MINI:
396
            /* some sort of a thumbnail? disregard this chunk... */
397
            stream_ptr += chunk_size - 6;
398
            break;
399

    
400
        default:
401
            av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
402
            break;
403
        }
404

    
405
        frame_size -= chunk_size;
406
        num_chunks--;
407
    }
408

    
409
    /* by the end of the chunk, the stream ptr should equal the frame
410
     * size (minus 1, possibly); if it doesn't, issue a warning */
411
    if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
412
        av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
413
               "and final chunk ptr = %d\n", buf_size, stream_ptr);
414

    
415
    /* make the palette available on the way out */
416
    memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
417
    if (s->new_palette) {
418
        s->frame.palette_has_changed = 1;
419
        s->new_palette = 0;
420
    }
421

    
422
    *data_size=sizeof(AVFrame);
423
    *(AVFrame*)data = s->frame;
424

    
425
    return buf_size;
426
}
427

    
428
static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
429
                                      void *data, int *data_size,
430
                                      uint8_t *buf, int buf_size)
431
{
432
    /* Note, the only difference between the 15Bpp and 16Bpp */
433
    /* Format is the pixel format, the packets are processed the same. */
434
    FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
435

    
436
    int stream_ptr = 0;
437
    int pixel_ptr;
438
    unsigned char palette_idx1;
439

    
440
    unsigned int frame_size;
441
    int num_chunks;
442

    
443
    unsigned int chunk_size;
444
    int chunk_type;
445

    
446
    int i, j;
447

    
448
    int lines;
449
    int compressed_lines;
450
    signed short line_packets;
451
    int y_ptr;
452
    int byte_run;
453
    int pixel_skip;
454
    int pixel_countdown;
455
    unsigned char *pixels;
456
    int pixel;
457
    int pixel_limit;
458

    
459
    s->frame.reference = 1;
460
    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
461
    if (avctx->reget_buffer(avctx, &s->frame) < 0) {
462
        av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
463
        return -1;
464
    }
465

    
466
    pixels = s->frame.data[0];
467
    pixel_limit = s->avctx->height * s->frame.linesize[0];
468

    
469
    frame_size = LE_32(&buf[stream_ptr]);
470
    stream_ptr += 6;  /* skip the magic number */
471
    num_chunks = LE_16(&buf[stream_ptr]);
472
    stream_ptr += 10;  /* skip padding */
473

    
474
    frame_size -= 16;
475

    
476
    /* iterate through the chunks */
477
    while ((frame_size > 0) && (num_chunks > 0)) {
478
        chunk_size = LE_32(&buf[stream_ptr]);
479
        stream_ptr += 4;
480
        chunk_type = LE_16(&buf[stream_ptr]);
481
        stream_ptr += 2;
482

    
483
        switch (chunk_type) {
484
        case FLI_256_COLOR:
485
        case FLI_COLOR:
486
            /* For some reason, it seems that non-paletised flics do include one of these */
487
            /* chunks in their first frame.  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 = LE_16(&buf[stream_ptr]);
496
            stream_ptr += 2;
497
            while (compressed_lines > 0) {
498
                line_packets = LE_16(&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    = LE_16(&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])) = LE_16(&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 balck 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)\n",
567
                                       pixel_countdown);
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)\n",
578
                                       pixel_countdown);
579
                        }
580
                    }
581
                }
582

    
583
                /* Now FLX is strange, in that it is "byte" as opposed to "pixel" run length compressed.
584
                 * This doesnt give us any good oportunity to perform word endian conversion
585
                 * during decompression. So if its requried (ie, this isnt a LE target, we do
586
                 * a second pass over the line here, swapping the bytes.
587
                 */
588
                pixel = 0xFF00;
589
                if (0xFF00 != LE_16(&pixel)) /* Check if its not an LE Target */
590
                {
591
                  pixel_ptr = y_ptr;
592
                  pixel_countdown = s->avctx->width;
593
                  while (pixel_countdown > 0) {
594
                    *((signed short*)(&pixels[pixel_ptr])) = LE_16(&buf[pixel_ptr]);
595
                    pixel_ptr += 2;
596
                  }
597
                }
598
                y_ptr += s->frame.linesize[0];
599
            }
600
            break;
601

    
602
        case FLI_DTA_BRUN:
603
            y_ptr = 0;
604
            for (lines = 0; lines < s->avctx->height; lines++) {
605
                pixel_ptr = y_ptr;
606
                /* disregard the line packets; instead, iterate through all
607
                 * pixels on a row */
608
                stream_ptr++;
609
                pixel_countdown = s->avctx->width; /* Width is in pixels, not bytes */
610

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

    
640
                y_ptr += s->frame.linesize[0];
641
            }
642
            break;
643

    
644
        case FLI_COPY:
645
        case FLI_DTA_COPY:
646
            /* copy the chunk (uncompressed frame) */
647
            if (chunk_size - 6 > (unsigned int)(s->avctx->width * s->avctx->height)*2) {
648
                av_log(avctx, AV_LOG_ERROR, "In chunk FLI_COPY : source data (%d bytes) " \
649
                       "bigger than image, skipping chunk\n", chunk_size - 6);
650
                stream_ptr += chunk_size - 6;
651
            } else {
652

    
653
                for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
654
                     y_ptr += s->frame.linesize[0]) {
655

    
656
                    pixel_countdown = s->avctx->width;
657
                    pixel_ptr = 0;
658
                    while (pixel_countdown > 0) {
659
                      *((signed short*)(&pixels[y_ptr + pixel_ptr])) = LE_16(&buf[stream_ptr+pixel_ptr]);
660
                      pixel_ptr += 2;
661
                      pixel_countdown--;
662
                    }
663
                    stream_ptr += s->avctx->width*2;
664
                }
665
            }
666
            break;
667

    
668
        case FLI_MINI:
669
            /* some sort of a thumbnail? disregard this chunk... */
670
            stream_ptr += chunk_size - 6;
671
            break;
672

    
673
        default:
674
            av_log(avctx, AV_LOG_ERROR, "Unrecognized chunk type: %d\n", chunk_type);
675
            break;
676
        }
677

    
678
        frame_size -= chunk_size;
679
        num_chunks--;
680
    }
681

    
682
    /* by the end of the chunk, the stream ptr should equal the frame
683
     * size (minus 1, possibly); if it doesn't, issue a warning */
684
    if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
685
        av_log(avctx, AV_LOG_ERROR, "Processed FLI chunk where chunk size = %d " \
686
               "and final chunk ptr = %d\n", buf_size, stream_ptr);
687

    
688

    
689
    *data_size=sizeof(AVFrame);
690
    *(AVFrame*)data = s->frame;
691

    
692
    return buf_size;
693
}
694

    
695
static int flic_decode_frame_24BPP(AVCodecContext *avctx,
696
                                   void *data, int *data_size,
697
                                   uint8_t *buf, int buf_size)
698
{
699
  av_log(avctx, AV_LOG_ERROR, "24Bpp FLC Unsupported due to lack of test files.\n");
700
  return -1;
701
}
702

    
703
static int flic_decode_frame(AVCodecContext *avctx,
704
                             void *data, int *data_size,
705
                             uint8_t *buf, int buf_size)
706
{
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
    /* Shouldnt 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 Format of FLC. My Science cant explain how this happened\n");
726
    return -1;
727
}
728

    
729

    
730
static 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
    CODEC_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
};