summaryrefslogtreecommitdiffstats
path: root/libavcodec/tiff.c
blob: 6c1c346e61d7c728412194ddbc062123e2f4c830 (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
/*
 * TIFF image decoder
 * Copyright (c) 2006 Konstantin Shishkov
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * TIFF image decoder
 * @file tiff.c
 * @author Konstantin Shishkov
 */
#include "avcodec.h"
#ifdef CONFIG_ZLIB
#include <zlib.h>
#endif
#include "lzw.h"
#include "tiff.h"


typedef struct TiffContext {
    AVCodecContext *avctx;
    AVFrame picture;

    int width, height;
    unsigned int bpp;
    int le;
    int compr;
    int invert;

    int strips, rps;
    int sot;
    uint8_t* stripdata;
    uint8_t* stripsizes;
    int stripsize, stripoff;
    LZWState *lzw;
} TiffContext;

static int tget_short(uint8_t **p, int le){
    int v = le ? AV_RL16(*p) : AV_RB16(*p);
    *p += 2;
    return v;
}

static int tget_long(uint8_t **p, int le){
    int v = le ? AV_RL32(*p) : AV_RB32(*p);
    *p += 4;
    return v;
}

static int tget(uint8_t **p, int type, int le){
    switch(type){
    case TIFF_BYTE : return *(*p)++;
    case TIFF_SHORT: return tget_short(p, le);
    case TIFF_LONG : return tget_long (p, le);
    default        : return -1;
    }
}

static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, uint8_t *src, int size, int lines){
    int c, line, pixels, code;
    uint8_t *ssrc = src;
    int width = s->width * (s->bpp / 8);
#ifdef CONFIG_ZLIB
    uint8_t *zbuf; unsigned long outlen;

    if(s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE){
        outlen = width * lines;
        zbuf = av_malloc(outlen);
        if(uncompress(zbuf, &outlen, src, size) != Z_OK){
            av_log(s->avctx, AV_LOG_ERROR, "Uncompressing failed (%lu of %lu)\n", outlen, (unsigned long)width * lines);
            av_free(zbuf);
            return -1;
        }
        src = zbuf;
        for(line = 0; line < lines; line++){
            memcpy(dst, src, width);
            dst += stride;
            src += width;
        }
        av_free(zbuf);
        return 0;
    }
#endif
    if(s->compr == TIFF_LZW){
        if(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 -1;
        }
    }
    for(line = 0; line < lines; line++){
        if(src - ssrc > size){
            av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");
            return -1;
        }
        switch(s->compr){
        case TIFF_RAW:
            memcpy(dst, src, s->width * (s->bpp / 8));
            src += s->width * (s->bpp / 8);
            break;
        case TIFF_PACKBITS:
            for(pixels = 0; pixels < width;){
                code = (int8_t)*src++;
                if(code >= 0){
                    code++;
                    if(pixels + code > width){
                        av_log(s->avctx, AV_LOG_ERROR, "Copy went out of bounds\n");
                        return -1;
                    }
                    memcpy(dst + pixels, src, code);
                    src += code;
                    pixels += code;
                }else if(code != -128){ // -127..-1
                    code = (-code) + 1;
                    if(pixels + code > width){
                        av_log(s->avctx, AV_LOG_ERROR, "Run went out of bounds\n");
                        return -1;
                    }
                    c = *src++;
                    memset(dst + pixels, c, code);
                    pixels += code;
                }
            }
            break;
        case TIFF_LZW:
            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 -1;
            }
            break;
        }
        dst += stride;
    }
    return 0;
}


static int tiff_decode_tag(TiffContext *s, uint8_t *start, uint8_t *buf, uint8_t *end_buf, AVFrame *pic)
{
    int tag, type, count, off, value = 0;
    uint8_t *src, *dst;
    int i, j, ssize, soff, stride;
    uint32_t *pal;
    uint8_t *rp, *gp, *bp;

    tag = tget_short(&buf, s->le);
    type = tget_short(&buf, s->le);
    count = tget_long(&buf, s->le);
    off = tget_long(&buf, s->le);

    if(count == 1){
        switch(type){
        case TIFF_BYTE:
        case TIFF_SHORT:
            buf -= 4;
            value = tget(&buf, type, s->le);
            buf = NULL;
            break;
        case TIFF_LONG:
            value = off;
            buf = NULL;
            break;
        default:
            value = -1;
            buf = start + off;
        }
    }else if(type_sizes[type] * count <= 4){
        buf -= 4;
    }else{
        buf = start + off;
    }

    if(buf && (buf < start || buf > end_buf)){
        av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
        return -1;
    }

    switch(tag){
    case TIFF_WIDTH:
        s->width = value;
        break;
    case TIFF_HEIGHT:
        s->height = value;
        break;
    case TIFF_BPP:
        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(&buf, type, s->le);
                break;
            default:
                s->bpp = -1;
            }
        }
        switch(s->bpp){
        case 8:
            s->avctx->pix_fmt = PIX_FMT_PAL8;
            break;
        case 24:
            s->avctx->pix_fmt = PIX_FMT_RGB24;
            break;
        case 16:
            if(count == 1){
                s->avctx->pix_fmt = PIX_FMT_GRAY16BE;
            }else{
                av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%i)\n", s->bpp);
                return -1;
            }
            break;
        default:
            av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%i)\n", s->bpp);
            return -1;
        }
        if(s->width != s->avctx->width || s->height != s->avctx->height){
            if(avcodec_check_dimensions(s->avctx, s->width, s->height))
                return -1;
            avcodec_set_dimensions(s->avctx, s->width, s->height);
        }
        if(s->picture.data[0])
            s->avctx->release_buffer(s->avctx, &s->picture);
        if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
            av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
            return -1;
        }
        if(s->bpp == 8){
            /* make default grayscale pal */
            pal = (uint32_t *) s->picture.data[1];
            for(i = 0; i < 256; i++)
                pal[i] = i * 0x010101;
        }
        break;
    case TIFF_COMPR:
        s->compr = value;
        switch(s->compr){
        case TIFF_RAW:
        case TIFF_PACKBITS:
        case TIFF_LZW:
            break;
        case TIFF_DEFLATE:
        case TIFF_ADOBE_DEFLATE:
#ifdef CONFIG_ZLIB
            break;
#else
            av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
            return -1;
#endif
        case TIFF_G3:
            av_log(s->avctx, AV_LOG_ERROR, "CCITT G3 compression is not supported\n");
            return -1;
        case TIFF_G4:
            av_log(s->avctx, AV_LOG_ERROR, "CCITT G4 compression is not supported\n");
            return -1;
        case TIFF_CCITT_RLE:
            av_log(s->avctx, AV_LOG_ERROR, "CCITT RLE compression is not supported\n");
            return -1;
        case TIFF_JPEG:
        case TIFF_NEWJPEG:
            av_log(s->avctx, AV_LOG_ERROR, "JPEG compression is not supported\n");
            return -1;
        default:
            av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n", s->compr);
            return -1;
        }
        break;
    case TIFF_ROWSPERSTRIP:
        if(value < 1){
            av_log(s->avctx, AV_LOG_ERROR, "Incorrect value of rows per strip\n");
            return -1;
        }
        s->rps = value;
        break;
    case TIFF_STRIP_OFFS:
        if(count == 1){
            s->stripdata = NULL;
            s->stripoff = value;
        }else
            s->stripdata = start + off;
        s->strips = count;
        if(s->strips == 1) s->rps = s->height;
        s->sot = type;
        if(s->stripdata > end_buf){
            av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
            return -1;
        }
        break;
    case TIFF_STRIP_SIZE:
        if(count == 1){
            s->stripsizes = NULL;
            s->stripsize = value;
            s->strips = 1;
        }else{
            s->stripsizes = start + off;
        }
        s->strips = count;
        if(s->stripsizes > end_buf){
            av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
            return -1;
        }
        if(!pic->data[0]){
            av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
            return -1;
        }
        /* now we have the data and may start decoding */
        stride = pic->linesize[0];
        dst = pic->data[0];
        for(i = 0; i < s->height; i += s->rps){
            if(s->stripsizes)
                ssize = tget(&s->stripsizes, type, s->le);
            else
                ssize = s->stripsize;

            if(s->stripdata){
                soff = tget(&s->stripdata, s->sot, s->le);
            }else
                soff = s->stripoff;
            src = start + soff;
            if(tiff_unpack_strip(s, dst, stride, src, ssize, FFMIN(s->rps, s->height - i)) < 0)
                break;
            dst += s->rps * stride;
        }
        break;
    case TIFF_PREDICTOR:
        if(!pic->data[0]){
            av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
            return -1;
        }
        if(value == 2){
            src = pic->data[0];
            stride = pic->linesize[0];
            soff = s->bpp >> 3;
            ssize = s->width * soff;
            for(i = 0; i < s->height; i++) {
                for(j = soff; j < ssize; j++)
                    src[j] += src[j - soff];
                src += stride;
            }
        }
        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 -1;
        }
        break;
    case TIFF_PAL:
        if(s->avctx->pix_fmt != PIX_FMT_PAL8){
            av_log(s->avctx, AV_LOG_ERROR, "Palette met but this is not palettized format\n");
            return -1;
        }
        pal = (uint32_t *) s->picture.data[1];
        off = type_sizes[type];
        rp = buf;
        gp = buf + count / 3 * off;
        bp = buf + count / 3 * off * 2;
        off = (type_sizes[type] - 1) << 3;
        for(i = 0; i < count / 3; i++){
            j = (tget(&rp, type, s->le) >> off) << 16;
            j |= (tget(&gp, type, s->le) >> off) << 8;
            j |= tget(&bp, type, s->le) >> off;
            pal[i] = j;
        }
        break;
    case TIFF_PLANAR:
        if(value == 2){
            av_log(s->avctx, AV_LOG_ERROR, "Planar format is not supported\n");
            return -1;
        }
        break;
    }
    return 0;
}

static int decode_frame(AVCodecContext *avctx,
                        void *data, int *data_size,
                        uint8_t *buf, int buf_size)
{
    TiffContext * const s = avctx->priv_data;
    AVFrame *picture = data;
    AVFrame * const p= (AVFrame*)&s->picture;
    uint8_t *orig_buf = buf, *end_buf = buf + buf_size;
    int id, le, off;
    int i, entries;

    //parse image header
    id = AV_RL16(buf); buf += 2;
    if(id == 0x4949) le = 1;
    else if(id == 0x4D4D) le = 0;
    else{
        av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");
        return -1;
    }
    s->le = le;
    s->invert = 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(&buf, le) != 42){
        av_log(avctx, AV_LOG_ERROR, "The answer to life, universe and everything is not correct!\n");
        return -1;
    }
    /* parse image file directory */
    off = tget_long(&buf, le);
    if(orig_buf + off + 14 >= end_buf){
        av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
        return -1;
    }
    buf = orig_buf + off;
    entries = tget_short(&buf, le);
    for(i = 0; i < entries; i++){
        if(tiff_decode_tag(s, orig_buf, buf, end_buf, p) < 0)
            return -1;
        buf += 12;
    }

    if(s->invert){
        uint8_t *src;
        int j;

        src = s->picture.data[0];
        for(j = 0; j < s->height; j++){
            for(i = 0; i < s->picture.linesize[0]; i++)
                src[i] = 255 - src[i];
            src += s->picture.linesize[0];
        }
    }
    *picture= *(AVFrame*)&s->picture;
    *data_size = sizeof(AVPicture);

    return buf_size;
}

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

    s->width = 0;
    s->height = 0;
    s->avctx = avctx;
    avcodec_get_frame_defaults((AVFrame*)&s->picture);
    avctx->coded_frame= (AVFrame*)&s->picture;
    s->picture.data[0] = NULL;
    ff_lzw_decode_open(&s->lzw);

    return 0;
}

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

    ff_lzw_decode_close(&s->lzw);
    if(s->picture.data[0])
        avctx->release_buffer(avctx, &s->picture);
    return 0;
}

AVCodec tiff_decoder = {
    "tiff",
    CODEC_TYPE_VIDEO,
    CODEC_ID_TIFF,
    sizeof(TiffContext),
    tiff_init,
    NULL,
    tiff_end,
    decode_frame,
    0,
    NULL
};
OpenPOWER on IntegriCloud