summaryrefslogtreecommitdiff
path: root/libavcodec/tiff.c
blob: 0cfa4c4972bd297ccdfa292251462602c549ba14 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
/*
 * TIFF image decoder
 * Copyright (c) 2006 Konstantin Shishkov
 *
 * This file is part of Libav.
 *
 * Libav is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * Libav is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * TIFF image decoder
 * @author Konstantin Shishkov
 */

#include "config.h"
#if CONFIG_ZLIB
#include <zlib.h>
#endif

#include "libavutil/attributes.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "faxcompr.h"
#include "internal.h"
#include "lzw.h"
#include "mathops.h"
#include "tiff.h"

typedef struct TiffContext {
    AVCodecContext *avctx;
    GetByteContext gb;

    int width, height;
    unsigned int bpp, bppcount;
    uint32_t palette[256];
    int palette_is_set;
    int le;
    enum TiffCompr compr;
    int invert;
    int fax_opts;
    int predictor;
    int fill_order;

    int strips, rps, sstype;
    int sot;
    int stripsizesoff, stripsize, stripoff, strippos;
    LZWState *lzw;
} TiffContext;

static unsigned tget_short(GetByteContext *gb, int le)
{
    return le ? bytestream2_get_le16(gb) : bytestream2_get_be16(gb);
}

static unsigned tget_long(GetByteContext *gb, int le)
{
    return le ? bytestream2_get_le32(gb) : bytestream2_get_be32(gb);
}

static unsigned tget(GetByteContext *gb, int type, int le)
{
    switch (type) {
    case TIFF_BYTE:  return bytestream2_get_byte(gb);
    case TIFF_SHORT: return tget_short(gb, le);
    case TIFF_LONG:  return tget_long(gb, le);
    default:         return UINT_MAX;
    }
}

#if CONFIG_ZLIB
static int tiff_uncompress(uint8_t *dst, unsigned long *len, const uint8_t *src,
                           int size)
{
    z_stream zstream = { 0 };
    int zret;

    zstream.next_in   = src;
    zstream.avail_in  = size;
    zstream.next_out  = dst;
    zstream.avail_out = *len;
    zret              = inflateInit(&zstream);
    if (zret != Z_OK) {
        av_log(NULL, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
        return zret;
    }
    zret = inflate(&zstream, Z_SYNC_FLUSH);
    inflateEnd(&zstream);
    *len = zstream.total_out;
    return zret == Z_STREAM_END ? Z_OK : zret;
}

static int tiff_unpack_zlib(TiffContext *s, uint8_t *dst, int stride,
                            const uint8_t *src, int size,
                            int width, int lines)
{
    uint8_t *zbuf;
    unsigned long outlen;
    int ret, line;
    outlen = width * lines;
    zbuf   = av_malloc(outlen);
    if (!zbuf)
        return AVERROR(ENOMEM);
    ret = tiff_uncompress(zbuf, &outlen, src, size);
    if (ret != Z_OK) {
        av_log(s->avctx, AV_LOG_ERROR,
               "Uncompressing failed (%lu of %lu) with error %d\n", outlen,
               (unsigned long)width * lines, ret);
        av_free(zbuf);
        return AVERROR_UNKNOWN;
    }
    src = zbuf;
    for (line = 0; line < lines; line++) {
        memcpy(dst, src, width);
        dst += stride;
        src += width;
    }
    av_free(zbuf);
    return 0;
}
#endif


static int tiff_unpack_fax(TiffContext *s, uint8_t *dst, int stride,
                           const uint8_t *src, int size, int lines)
{
    int i, ret = 0;
    uint8_t *src2 = av_malloc((unsigned)size +
                              FF_INPUT_BUFFER_PADDING_SIZE);

    if (!src2) {
        av_log(s->avctx, AV_LOG_ERROR,
               "Error allocating temporary buffer\n");
        return AVERROR(ENOMEM);
    }
    if (s->fax_opts & 2) {
        avpriv_request_sample(s->avctx, "Uncompressed fax mode");
        av_free(src2);
        return AVERROR_PATCHWELCOME;
    }
    if (!s->fill_order) {
        memcpy(src2, src, size);
    } else {
        for (i = 0; i < size; i++)
            src2[i] = ff_reverse[src[i]];
    }
    memset(src2 + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
    ret = ff_ccitt_unpack(s->avctx, src2, size, dst, lines, stride,
                          s->compr, s->fax_opts);
    av_free(src2);
    return ret;
}

static int tiff_unpack_strip(TiffContext *s, uint8_t *dst, int stride,
                             const uint8_t *src, int size, int lines)
{
    PutByteContext pb;
    int c, line, pixels, code, ret;
    int width = ((s->width * s->bpp) + 7) >> 3;

    if (size <= 0)
        return AVERROR_INVALIDDATA;

    if (s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE) {
#if CONFIG_ZLIB
        return tiff_unpack_zlib(s, dst, stride, src, size, width, lines);
#else
        av_log(s->avctx, AV_LOG_ERROR,
               "zlib support not enabled, "
               "deflate compression not supported\n");
        return AVERROR(ENOSYS);
#endif
    }
    if (s->compr == TIFF_LZW) {
        if ((ret = ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF)) < 0) {
            av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
            return ret;
        }
        for (line = 0; line < lines; line++) {
            pixels = ff_lzw_decode(s->lzw, dst, width);
            if (pixels < width) {
                av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n",
                       pixels, width);
                return AVERROR_INVALIDDATA;
            }
            dst += stride;
        }
        return 0;
    }
    if (s->compr == TIFF_CCITT_RLE ||
        s->compr == TIFF_G3        ||
        s->compr == TIFF_G4) {
        return tiff_unpack_fax(s, dst, stride, src, size, lines);
    }

    bytestream2_init(&s->gb, src, size);
    bytestream2_init_writer(&pb, dst, stride * lines);

    for (line = 0; line < lines; line++) {
        if (bytestream2_get_bytes_left(&s->gb) == 0 || bytestream2_get_eof(&pb))
            break;
        bytestream2_seek_p(&pb, stride * line, SEEK_SET);
        switch (s->compr) {
        case TIFF_RAW:
            if (!s->fill_order) {
                bytestream2_copy_buffer(&pb, &s->gb, width);
            } else {
                int i;
                for (i = 0; i < width; i++)
                    bytestream2_put_byte(&pb, ff_reverse[bytestream2_get_byte(&s->gb)]);
            }
            break;
        case TIFF_PACKBITS:
            for (pixels = 0; pixels < width;) {
                code = ff_u8_to_s8(bytestream2_get_byte(&s->gb));
                if (code >= 0) {
                    code++;
                    bytestream2_copy_buffer(&pb, &s->gb, code);
                    pixels += code;
                } else if (code != -128) { // -127..-1
                    code = (-code) + 1;
                    c    = bytestream2_get_byte(&s->gb);
                    bytestream2_set_buffer(&pb, c, code);
                    pixels += code;
                }
            }
            break;
        }
    }
    return 0;
}

static int init_image(TiffContext *s, AVFrame *frame)
{
    int i, ret;
    uint32_t *pal;

    switch (s->bpp * 10 + s->bppcount) {
    case 11:
        s->avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
        break;
    case 81:
        s->avctx->pix_fmt = AV_PIX_FMT_PAL8;
        break;
    case 243:
        s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
        break;
    case 161:
        s->avctx->pix_fmt = s->le ? AV_PIX_FMT_GRAY16LE : AV_PIX_FMT_GRAY16BE;
        break;
    case 324:
        s->avctx->pix_fmt = AV_PIX_FMT_RGBA;
        break;
    case 483:
        s->avctx->pix_fmt = s->le ? AV_PIX_FMT_RGB48LE : AV_PIX_FMT_RGB48BE;
        break;
    default:
        av_log(s->avctx, AV_LOG_ERROR,
               "This format is not supported (bpp=%d, bppcount=%d)\n",
               s->bpp, s->bppcount);
        return AVERROR_INVALIDDATA;
    }
    if (s->width != s->avctx->width || s->height != s->avctx->height) {
        ret = ff_set_dimensions(s->avctx, s->width, s->height);
        if (ret < 0)
            return ret;
    }
    if ((ret = ff_get_buffer(s->avctx, frame, 0)) < 0) {
        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
        return ret;
    }
    if (s->avctx->pix_fmt == AV_PIX_FMT_PAL8) {
        if (s->palette_is_set) {
            memcpy(frame->data[1], s->palette, sizeof(s->palette));
        } else {
            /* make default grayscale pal */
            pal = (uint32_t *) frame->data[1];
            for (i = 0; i < 256; i++)
                pal[i] = i * 0x010101;
        }
    }
    return 0;
}

static int tiff_decode_tag(TiffContext *s)
{
    unsigned tag, type, count, off, value = 0;
    int i, start;
    uint32_t *pal;

    if (bytestream2_get_bytes_left(&s->gb) < 12)
        return AVERROR_INVALIDDATA;
    tag   = tget_short(&s->gb, s->le);
    type  = tget_short(&s->gb, s->le);
    count = tget_long(&s->gb, s->le);
    off   = tget_long(&s->gb, s->le);
    start = bytestream2_tell(&s->gb);

    if (type == 0 || type >= FF_ARRAY_ELEMS(type_sizes)) {
        av_log(s->avctx, AV_LOG_DEBUG, "Unknown tiff type (%u) encountered\n",
               type);
        return 0;
    }

    if (count == 1) {
        switch (type) {
        case TIFF_BYTE:
        case TIFF_SHORT:
            bytestream2_seek(&s->gb, -4, SEEK_CUR);
            value = tget(&s->gb, type, s->le);
            break;
        case TIFF_LONG:
            value = off;
            break;
        case TIFF_STRING:
            if (count <= 4) {
                bytestream2_seek(&s->gb, -4, SEEK_CUR);
                break;
            }
        default:
            value = UINT_MAX;
            bytestream2_seek(&s->gb, off, SEEK_SET);
        }
    } else {
        if (count <= 4 && type_sizes[type] * count <= 4)
            bytestream2_seek(&s->gb, -4, SEEK_CUR);
        else
            bytestream2_seek(&s->gb, off, SEEK_SET);
    }

    switch (tag) {
    case TIFF_WIDTH:
        s->width = value;
        break;
    case TIFF_HEIGHT:
        s->height = value;
        break;
    case TIFF_BPP:
        s->bppcount = count;
        if (count > 4) {
            av_log(s->avctx, AV_LOG_ERROR,
                   "This format is not supported (bpp=%d, %d components)\n",
                   s->bpp, count);
            return AVERROR_INVALIDDATA;
        }
        if (count == 1)
            s->bpp = value;
        else {
            switch (type) {
            case TIFF_BYTE:
                s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) +
                         ((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);
                break;
            case TIFF_SHORT:
            case TIFF_LONG:
                s->bpp = 0;
                for (i = 0; i < count; i++)
                    s->bpp += tget(&s->gb, type, s->le);
                break;
            default:
                s->bpp = -1;
            }
        }
        break;
    case TIFF_SAMPLES_PER_PIXEL:
        if (count != 1) {
            av_log(s->avctx, AV_LOG_ERROR,
                   "Samples per pixel requires a single value, many provided\n");
            return AVERROR_INVALIDDATA;
        }
        if (s->bppcount == 1)
            s->bpp *= value;
        s->bppcount = value;
        break;
    case TIFF_COMPR:
        s->compr     = value;
        s->predictor = 0;
        switch (s->compr) {
        case TIFF_RAW:
        case TIFF_PACKBITS:
        case TIFF_LZW:
        case TIFF_CCITT_RLE:
            break;
        case TIFF_G3:
        case TIFF_G4:
            s->fax_opts = 0;
            break;
        case TIFF_DEFLATE:
        case TIFF_ADOBE_DEFLATE:
#if CONFIG_ZLIB
            break;
#else
            av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
            return AVERROR(ENOSYS);
#endif
        case TIFF_JPEG:
        case TIFF_NEWJPEG:
            avpriv_report_missing_feature(s->avctx, "JPEG compression");
            return AVERROR_PATCHWELCOME;
        default:
            av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n",
                   s->compr);
            return AVERROR_INVALIDDATA;
        }
        break;
    case TIFF_ROWSPERSTRIP:
        if (type == TIFF_LONG && value == UINT_MAX)
            value = s->avctx->height;
        if (value < 1) {
            av_log(s->avctx, AV_LOG_ERROR,
                   "Incorrect value of rows per strip\n");
            return AVERROR_INVALIDDATA;
        }
        s->rps = value;
        break;
    case TIFF_STRIP_OFFS:
        if (count == 1) {
            s->strippos = 0;
            s->stripoff = value;
        } else
            s->strippos = off;
        s->strips = count;
        if (s->strips == 1)
            s->rps = s->height;
        s->sot = type;
        break;
    case TIFF_STRIP_SIZE:
        if (count == 1) {
            s->stripsizesoff = 0;
            s->stripsize     = value;
            s->strips        = 1;
        } else {
            s->stripsizesoff = off;
        }
        s->strips = count;
        s->sstype = type;
        break;
    case TIFF_PREDICTOR:
        s->predictor = value;
        break;
    case TIFF_INVERT:
        switch (value) {
        case 0:
            s->invert = 1;
            break;
        case 1:
            s->invert = 0;
            break;
        case 2:
        case 3:
            break;
        default:
            av_log(s->avctx, AV_LOG_ERROR, "Color mode %d is not supported\n",
                   value);
            return AVERROR_INVALIDDATA;
        }
        break;
    case TIFF_FILL_ORDER:
        if (value < 1 || value > 2) {
            av_log(s->avctx, AV_LOG_ERROR,
                   "Unknown FillOrder value %d, trying default one\n", value);
            value = 1;
        }
        s->fill_order = value - 1;
        break;
    case TIFF_PAL: {
        GetByteContext pal_gb[3];
        pal = (uint32_t *) s->palette;
        off = type_sizes[type];
        if (count / 3 > 256 ||
            bytestream2_get_bytes_left(&s->gb) < count / 3 * off * 3)
            return AVERROR_INVALIDDATA;
        pal_gb[0] = pal_gb[1] = pal_gb[2] = s->gb;
        bytestream2_skip(&pal_gb[1], count / 3 * off);
        bytestream2_skip(&pal_gb[2], count / 3 * off * 2);
        off = (type_sizes[type] - 1) << 3;
        for (i = 0; i < count / 3; i++) {
            uint32_t p = 0xFF000000;
            p |= (tget(&pal_gb[0], type, s->le) >> off) << 16;
            p |= (tget(&pal_gb[1], type, s->le) >> off) << 8;
            p |=  tget(&pal_gb[2], type, s->le) >> off;
            pal[i] = p;
        }
        s->palette_is_set = 1;
        break;
    }
    case TIFF_PLANAR:
        if (value == 2) {
            avpriv_report_missing_feature(s->avctx, "Planar format");
            return AVERROR_PATCHWELCOME;
        }
        break;
    case TIFF_T4OPTIONS:
        if (s->compr == TIFF_G3)
            s->fax_opts = value;
        break;
    case TIFF_T6OPTIONS:
        if (s->compr == TIFF_G4)
            s->fax_opts = value;
        break;
    default:
        if (s->avctx->err_recognition & AV_EF_EXPLODE) {
            av_log(s->avctx, AV_LOG_ERROR,
                   "Unknown or unsupported tag %d/0X%0X\n",
                   tag, tag);
            return AVERROR_INVALIDDATA;
        }
    }
    bytestream2_seek(&s->gb, start, SEEK_SET);
    return 0;
}

static int decode_frame(AVCodecContext *avctx,
                        void *data, int *got_frame, AVPacket *avpkt)
{
    TiffContext *const s = avctx->priv_data;
    AVFrame *const p = data;
    unsigned off;
    int id, le, ret;
    int i, j, entries, stride;
    unsigned soff, ssize;
    uint8_t *dst;
    GetByteContext stripsizes;
    GetByteContext stripdata;

    bytestream2_init(&s->gb, avpkt->data, avpkt->size);

    // parse image header
    if (avpkt->size < 8)
        return AVERROR_INVALIDDATA;
    id = bytestream2_get_le16(&s->gb);
    if (id == 0x4949)
        le = 1;
    else if (id == 0x4D4D)
        le = 0;
    else {
        av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");
        return AVERROR_INVALIDDATA;
    }
    s->le         = le;
    s->invert     = 0;
    s->compr      = TIFF_RAW;
    s->fill_order = 0;
    // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number
    // that further identifies the file as a TIFF file"
    if (tget_short(&s->gb, le) != 42) {
        av_log(avctx, AV_LOG_ERROR,
               "The answer to life, universe and everything is not correct!\n");
        return AVERROR_INVALIDDATA;
    }
    // Reset these offsets so we can tell if they were set this frame
    s->stripsizesoff = s->strippos = 0;
    /* parse image file directory */
    off = tget_long(&s->gb, le);
    if (off >= UINT_MAX - 14 || avpkt->size < off + 14) {
        av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
        return AVERROR_INVALIDDATA;
    }
    bytestream2_seek(&s->gb, off, SEEK_SET);
    entries = tget_short(&s->gb, le);
    for (i = 0; i < entries; i++) {
        if ((ret = tiff_decode_tag(s)) < 0)
            return ret;
    }
    if (!s->strippos && !s->stripoff) {
        av_log(avctx, AV_LOG_ERROR, "Image data is missing\n");
        return AVERROR_INVALIDDATA;
    }
    /* now we have the data and may start decoding */
    if ((ret = init_image(s, p)) < 0)
        return ret;

    if (s->strips == 1 && !s->stripsize) {
        av_log(avctx, AV_LOG_WARNING, "Image data size missing\n");
        s->stripsize = avpkt->size - s->stripoff;
    }
    stride = p->linesize[0];
    dst    = p->data[0];

    if (s->stripsizesoff) {
        if (s->stripsizesoff >= avpkt->size)
            return AVERROR_INVALIDDATA;
        bytestream2_init(&stripsizes, avpkt->data + s->stripsizesoff,
                         avpkt->size - s->stripsizesoff);
    }
    if (s->strippos) {
        if (s->strippos >= avpkt->size)
            return AVERROR_INVALIDDATA;
        bytestream2_init(&stripdata, avpkt->data + s->strippos,
                         avpkt->size - s->strippos);
    }

    for (i = 0; i < s->height; i += s->rps) {
        if (s->stripsizesoff)
            ssize = tget(&stripsizes, s->sstype, le);
        else
            ssize = s->stripsize;

        if (s->strippos)
            soff = tget(&stripdata, s->sot, le);
        else
            soff = s->stripoff;

        if (soff > avpkt->size || ssize > avpkt->size - soff) {
            av_log(avctx, AV_LOG_ERROR, "Invalid strip size/offset\n");
            return AVERROR_INVALIDDATA;
        }
        if ((ret = tiff_unpack_strip(s, dst, stride, avpkt->data + soff, ssize,
                                     FFMIN(s->rps, s->height - i))) < 0) {
            if (avctx->err_recognition & AV_EF_EXPLODE)
                return ret;
            break;
        }
        dst += s->rps * stride;
    }
    if (s->predictor == 2) {
        dst   = p->data[0];
        soff  = s->bpp >> 3;
        ssize = s->width * soff;
        for (i = 0; i < s->height; i++) {
            for (j = soff; j < ssize; j++)
                dst[j] += dst[j - soff];
            dst += stride;
        }
    }

    if (s->invert) {
        dst = p->data[0];
        for (i = 0; i < s->height; i++) {
            for (j = 0; j < p->linesize[0]; j++)
                dst[j] = 255 - dst[j];
            dst += stride;
        }
    }
    *got_frame = 1;

    return avpkt->size;
}

static av_cold int tiff_init(AVCodecContext *avctx)
{
    TiffContext *s = avctx->priv_data;

    s->width  = 0;
    s->height = 0;
    s->avctx  = avctx;
    ff_lzw_decode_open(&s->lzw);
    ff_ccitt_unpack_init();

    return 0;
}

static av_cold int tiff_end(AVCodecContext *avctx)
{
    TiffContext *const s = avctx->priv_data;

    ff_lzw_decode_close(&s->lzw);
    return 0;
}

AVCodec ff_tiff_decoder = {
    .name           = "tiff",
    .long_name      = NULL_IF_CONFIG_SMALL("TIFF image"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_TIFF,
    .priv_data_size = sizeof(TiffContext),
    .init           = tiff_init,
    .close          = tiff_end,
    .decode         = decode_frame,
    .capabilities   = CODEC_CAP_DR1,
};