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 typedef struct TiffContext {
66 AVCodecContext *avctx;
79 int stripsize, stripoff;
83 static int tget_short(uint8_t **p, int le){
84 int v = le ? LE_16(*p) : BE_16(*p);
89 static int tget_long(uint8_t **p, int le){
90 int v = le ? LE_32(*p) : BE_32(*p);
95 static int tget(uint8_t **p, int type, int le){
97 case TIFF_BYTE : return *(*p)++;
98 case TIFF_SHORT: return tget_short(p, le);
99 case TIFF_LONG : return tget_long (p, le);
104 static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, uint8_t *src, int size, int lines){
105 int c, line, pixels, code;
107 int width = s->width * (s->bpp / 8);
109 uint8_t *zbuf; unsigned long outlen;
111 if(s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE){
112 outlen = width * lines;
113 if(lines != s->height){
114 av_log(s->avctx, AV_LOG_ERROR, "This decoder won't decode ZLib-packed TIFF with %i lines per strip\n", lines);
117 zbuf = av_malloc(outlen);
118 if(uncompress(zbuf, &outlen, src, size) != Z_OK){
119 av_log(s->avctx, AV_LOG_ERROR, "Uncompressing failed (%lu of %lu)\n", outlen, (unsigned long)width * lines);
124 for(line = 0; line < lines; line++){
125 memcpy(dst, src, width);
133 if(s->compr == TIFF_LZW){
134 if(ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF) < 0){
135 av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
139 for(line = 0; line < lines; line++){
140 if(src - ssrc > size){
141 av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");
146 memcpy(dst, src, s->width * (s->bpp / 8));
147 src += s->width * (s->bpp / 8);
150 for(pixels = 0; pixels < width;){
151 code = (int8_t)*src++;
154 if(pixels + code > width){
155 av_log(s->avctx, AV_LOG_ERROR, "Copy went out of bounds\n");
158 memcpy(dst + pixels, src, code);
161 }else if(code != -128){ // -127..-1
163 if(pixels + code > width){
164 av_log(s->avctx, AV_LOG_ERROR, "Run went out of bounds\n");
168 memset(dst + pixels, c, code);
174 pixels = ff_lzw_decode(s->lzw, dst, width);
176 av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n", pixels, width);
187 static int tiff_decode_tag(TiffContext *s, uint8_t *start, uint8_t *buf, uint8_t *end_buf, AVFrame *pic)
189 int tag, type, count, off, value = 0;
191 int i, j, ssize, soff, stride;
192 int *pal, *rp, *gp, *bp;
194 tag = tget_short(&buf, s->le);
195 type = tget_short(&buf, s->le);
196 count = tget_long(&buf, s->le);
197 off = tget_long(&buf, s->le);
204 value = tget(&buf, type, s->le);
219 if(buf && (buf < start || buf > end_buf)){
220 av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
232 if(count == 1) s->bpp = value;
236 s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) + ((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);
241 for(i = 0; i < count; i++) s->bpp += tget(&buf, type, s->le);
249 s->avctx->pix_fmt = PIX_FMT_PAL8;
252 s->avctx->pix_fmt = PIX_FMT_RGB24;
255 av_log(s->avctx, AV_LOG_ERROR, "Only RGB24 is supported (this bpp=%i)\n", s->bpp);
258 if(s->width != s->avctx->width || s->height != s->avctx->height){
259 if(avcodec_check_dimensions(s->avctx, s->width, s->height))
261 avcodec_set_dimensions(s->avctx, s->width, s->height);
263 if(s->picture.data[0])
264 s->avctx->release_buffer(s->avctx, &s->picture);
265 if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
266 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
270 /* make default grayscale pal */
271 pal = s->picture.data[1];
272 for(i = 0; i < 256; i++)
273 pal[i] = i * 0x010101;
284 case TIFF_ADOBE_DEFLATE:
288 av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
292 av_log(s->avctx, AV_LOG_ERROR, "CCITT G3 compression is not supported\n");
295 av_log(s->avctx, AV_LOG_ERROR, "CCITT G4 compression is not supported\n");
298 av_log(s->avctx, AV_LOG_ERROR, "CCITT RLE compression is not supported\n");
302 av_log(s->avctx, AV_LOG_ERROR, "JPEG compression is not supported\n");
305 av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n", s->compr);
309 case TIFF_ROWSPERSTRIP:
311 av_log(s->avctx, AV_LOG_ERROR, "Incorrect value of rows per strip\n");
316 case TIFF_STRIP_OFFS:
321 s->stripdata = start + off;
324 if(s->stripdata > end_buf){
325 av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
329 case TIFF_STRIP_SIZE:
331 s->stripsizes = NULL;
332 s->stripsize = value;
335 s->stripsizes = start + off;
338 if(s->stripsizes > end_buf){
339 av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
343 av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
346 /* now we have the data and may start decoding */
347 stride = pic->linesize[0];
349 for(i = 0; i < s->height; i += s->rps){
351 ssize = tget(&s->stripsizes, type, s->le);
353 ssize = s->stripsize;
356 soff = tget(&s->stripdata, s->sot, s->le);
360 if(tiff_unpack_strip(s, dst, stride, src, ssize, FFMIN(s->rps, s->height - i)) < 0)
362 dst += s->rps * stride;
367 av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
372 stride = pic->linesize[0];
374 ssize = s->width * soff;
375 for(i = 0; i < s->height; i++) {
376 for(j = soff; j < ssize; j++)
377 src[j] += src[j - soff];
394 av_log(s->avctx, AV_LOG_ERROR, "Color mode %d is not supported\n", value);
399 if(s->avctx->pix_fmt != PIX_FMT_PAL8){
400 av_log(s->avctx, AV_LOG_ERROR, "Palette met but this is not palettized format\n");
403 pal = s->picture.data[1];
404 off = (type == TIFF_SHORT) ? 2 : 1;
406 gp = buf + count / 3 * off;
407 bp = buf + count / 3 * off * 2;
408 off = (type == TIFF_SHORT) ? 8 : 0;
409 for(i = 0; i < count / 3; i++){
410 j = (tget(&rp, type, s->le) >> off) << 16;
411 j |= (tget(&gp, type, s->le) >> off) << 8;
412 j |= tget(&bp, type, s->le) >> off;
419 static int decode_frame(AVCodecContext *avctx,
420 void *data, int *data_size,
421 uint8_t *buf, int buf_size)
423 TiffContext * const s = avctx->priv_data;
424 AVFrame *picture = data;
425 AVFrame * const p= (AVFrame*)&s->picture;
426 uint8_t *orig_buf = buf, *end_buf = buf + buf_size;
431 id = LE_16(buf); buf += 2;
432 if(id == 0x4949) le = 1;
433 else if(id == 0x4D4D) le = 0;
435 av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");
440 // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number
441 // that further identifies the file as a TIFF file"
442 if(tget_short(&buf, le) != 42){
443 av_log(avctx, AV_LOG_ERROR, "The answer to life, universe and everything is not correct!\n");
446 /* parse image file directory */
447 off = tget_long(&buf, le);
448 if(orig_buf + off + 14 >= end_buf){
449 av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
452 buf = orig_buf + off;
453 entries = tget_short(&buf, le);
454 for(i = 0; i < entries; i++){
455 if(tiff_decode_tag(s, orig_buf, buf, end_buf, p) < 0)
464 src = s->picture.data[0];
465 for(j = 0; j < s->height; j++){
466 for(i = 0; i < s->picture.linesize[0]; i++)
467 src[i] = 255 - src[i];
468 src += s->picture.linesize[0];
471 *picture= *(AVFrame*)&s->picture;
472 *data_size = sizeof(AVPicture);
477 static int tiff_init(AVCodecContext *avctx){
478 TiffContext *s = avctx->priv_data;
483 avcodec_get_frame_defaults((AVFrame*)&s->picture);
484 avctx->coded_frame= (AVFrame*)&s->picture;
485 s->picture.data[0] = NULL;
486 ff_lzw_decode_open(&s->lzw);
491 static int tiff_end(AVCodecContext *avctx)
493 TiffContext * const s = avctx->priv_data;
495 ff_lzw_decode_close(&s->lzw);
496 if(s->picture.data[0])
497 avctx->release_buffer(avctx, &s->picture);
501 AVCodec tiff_decoder = {