3 * Copyright (c) 2006 Konstantin Shishkov
5 * This file is part of FFmpeg.
7 * 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.
12 * 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
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 /* abridged list of TIFF tags */
35 TIFF_STRIP_OFFS = 0x111,
36 TIFF_ROWSPERSTRIP = 0x116,
40 TIFF_PREDICTOR = 0x13D,
53 TIFF_PACKBITS = 0x8005,
65 /** sizes of various TIFF field types */
66 static const int type_sizes[6] = {
70 typedef struct TiffContext {
71 AVCodecContext *avctx;
84 int stripsize, stripoff;
88 static int tget_short(uint8_t **p, int le){
89 int v = le ? LE_16(*p) : BE_16(*p);
94 static int tget_long(uint8_t **p, int le){
95 int v = le ? LE_32(*p) : BE_32(*p);
100 static int tget(uint8_t **p, int type, int le){
102 case TIFF_BYTE : return *(*p)++;
103 case TIFF_SHORT: return tget_short(p, le);
104 case TIFF_LONG : return tget_long (p, le);
109 static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, uint8_t *src, int size, int lines){
110 int c, line, pixels, code;
112 int width = s->width * (s->bpp / 8);
114 uint8_t *zbuf; unsigned long outlen;
116 if(s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE){
117 outlen = width * lines;
118 zbuf = av_malloc(outlen);
119 if(uncompress(zbuf, &outlen, src, size) != Z_OK){
120 av_log(s->avctx, AV_LOG_ERROR, "Uncompressing failed (%lu of %lu)\n", outlen, (unsigned long)width * lines);
125 for(line = 0; line < lines; line++){
126 memcpy(dst, src, width);
134 if(s->compr == TIFF_LZW){
135 if(ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF) < 0){
136 av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
140 for(line = 0; line < lines; line++){
141 if(src - ssrc > size){
142 av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");
147 memcpy(dst, src, s->width * (s->bpp / 8));
148 src += s->width * (s->bpp / 8);
151 for(pixels = 0; pixels < width;){
152 code = (int8_t)*src++;
155 if(pixels + code > width){
156 av_log(s->avctx, AV_LOG_ERROR, "Copy went out of bounds\n");
159 memcpy(dst + pixels, src, code);
162 }else if(code != -128){ // -127..-1
164 if(pixels + code > width){
165 av_log(s->avctx, AV_LOG_ERROR, "Run went out of bounds\n");
169 memset(dst + pixels, c, code);
175 pixels = ff_lzw_decode(s->lzw, dst, width);
177 av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n", pixels, width);
188 static int tiff_decode_tag(TiffContext *s, uint8_t *start, uint8_t *buf, uint8_t *end_buf, AVFrame *pic)
190 int tag, type, count, off, value = 0;
192 int i, j, ssize, soff, stride;
193 int *pal, *rp, *gp, *bp;
195 tag = tget_short(&buf, s->le);
196 type = tget_short(&buf, s->le);
197 count = tget_long(&buf, s->le);
198 off = tget_long(&buf, s->le);
205 value = tget(&buf, type, s->le);
216 }else if(type_sizes[type] * count <= 4){
222 if(buf && (buf < start || buf > end_buf)){
223 av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
235 if(count == 1) s->bpp = value;
239 s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) + ((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);
244 for(i = 0; i < count; i++) s->bpp += tget(&buf, type, s->le);
252 s->avctx->pix_fmt = PIX_FMT_PAL8;
255 s->avctx->pix_fmt = PIX_FMT_RGB24;
258 av_log(s->avctx, AV_LOG_ERROR, "Only RGB24 is supported (this bpp=%i)\n", s->bpp);
261 if(s->width != s->avctx->width || s->height != s->avctx->height){
262 if(avcodec_check_dimensions(s->avctx, s->width, s->height))
264 avcodec_set_dimensions(s->avctx, s->width, s->height);
266 if(s->picture.data[0])
267 s->avctx->release_buffer(s->avctx, &s->picture);
268 if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
269 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
273 /* make default grayscale pal */
274 pal = s->picture.data[1];
275 for(i = 0; i < 256; i++)
276 pal[i] = i * 0x010101;
287 case TIFF_ADOBE_DEFLATE:
291 av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
295 av_log(s->avctx, AV_LOG_ERROR, "CCITT G3 compression is not supported\n");
298 av_log(s->avctx, AV_LOG_ERROR, "CCITT G4 compression is not supported\n");
301 av_log(s->avctx, AV_LOG_ERROR, "CCITT RLE compression is not supported\n");
305 av_log(s->avctx, AV_LOG_ERROR, "JPEG compression is not supported\n");
308 av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n", s->compr);
312 case TIFF_ROWSPERSTRIP:
314 av_log(s->avctx, AV_LOG_ERROR, "Incorrect value of rows per strip\n");
319 case TIFF_STRIP_OFFS:
324 s->stripdata = start + off;
327 if(s->stripdata > end_buf){
328 av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
332 case TIFF_STRIP_SIZE:
334 s->stripsizes = NULL;
335 s->stripsize = value;
338 s->stripsizes = start + off;
341 if(s->stripsizes > end_buf){
342 av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
346 av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
349 /* now we have the data and may start decoding */
350 stride = pic->linesize[0];
352 for(i = 0; i < s->height; i += s->rps){
354 ssize = tget(&s->stripsizes, type, s->le);
356 ssize = s->stripsize;
359 soff = tget(&s->stripdata, s->sot, s->le);
363 if(tiff_unpack_strip(s, dst, stride, src, ssize, FFMIN(s->rps, s->height - i)) < 0)
365 dst += s->rps * stride;
370 av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
375 stride = pic->linesize[0];
377 ssize = s->width * soff;
378 for(i = 0; i < s->height; i++) {
379 for(j = soff; j < ssize; j++)
380 src[j] += src[j - soff];
397 av_log(s->avctx, AV_LOG_ERROR, "Color mode %d is not supported\n", value);
402 if(s->avctx->pix_fmt != PIX_FMT_PAL8){
403 av_log(s->avctx, AV_LOG_ERROR, "Palette met but this is not palettized format\n");
406 pal = s->picture.data[1];
407 off = type_sizes[type];
409 gp = buf + count / 3 * off;
410 bp = buf + count / 3 * off * 2;
411 off = (type_sizes[type] - 1) << 3;
412 for(i = 0; i < count / 3; i++){
413 j = (tget(&rp, type, s->le) >> off) << 16;
414 j |= (tget(&gp, type, s->le) >> off) << 8;
415 j |= tget(&bp, type, s->le) >> off;
422 static int decode_frame(AVCodecContext *avctx,
423 void *data, int *data_size,
424 uint8_t *buf, int buf_size)
426 TiffContext * const s = avctx->priv_data;
427 AVFrame *picture = data;
428 AVFrame * const p= (AVFrame*)&s->picture;
429 uint8_t *orig_buf = buf, *end_buf = buf + buf_size;
434 id = LE_16(buf); buf += 2;
435 if(id == 0x4949) le = 1;
436 else if(id == 0x4D4D) le = 0;
438 av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");
443 // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number
444 // that further identifies the file as a TIFF file"
445 if(tget_short(&buf, le) != 42){
446 av_log(avctx, AV_LOG_ERROR, "The answer to life, universe and everything is not correct!\n");
449 /* parse image file directory */
450 off = tget_long(&buf, le);
451 if(orig_buf + off + 14 >= end_buf){
452 av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
455 buf = orig_buf + off;
456 entries = tget_short(&buf, le);
457 for(i = 0; i < entries; i++){
458 if(tiff_decode_tag(s, orig_buf, buf, end_buf, p) < 0)
467 src = s->picture.data[0];
468 for(j = 0; j < s->height; j++){
469 for(i = 0; i < s->picture.linesize[0]; i++)
470 src[i] = 255 - src[i];
471 src += s->picture.linesize[0];
474 *picture= *(AVFrame*)&s->picture;
475 *data_size = sizeof(AVPicture);
480 static int tiff_init(AVCodecContext *avctx){
481 TiffContext *s = avctx->priv_data;
486 avcodec_get_frame_defaults((AVFrame*)&s->picture);
487 avctx->coded_frame= (AVFrame*)&s->picture;
488 s->picture.data[0] = NULL;
489 ff_lzw_decode_open(&s->lzw);
494 static int tiff_end(AVCodecContext *avctx)
496 TiffContext * const s = avctx->priv_data;
498 ff_lzw_decode_close(&s->lzw);
499 if(s->picture.data[0])
500 avctx->release_buffer(avctx, &s->picture);
504 AVCodec tiff_decoder = {