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,
41 TIFF_PREDICTOR = 0x13D,
54 TIFF_PACKBITS = 0x8005,
66 /** sizes of various TIFF field types */
67 static const int type_sizes[6] = {
71 typedef struct TiffContext {
72 AVCodecContext *avctx;
85 int stripsize, stripoff;
89 static int tget_short(uint8_t **p, int le){
90 int v = le ? AV_RL16(*p) : AV_RB16(*p);
95 static int tget_long(uint8_t **p, int le){
96 int v = le ? AV_RL32(*p) : AV_RB32(*p);
101 static int tget(uint8_t **p, int type, int le){
103 case TIFF_BYTE : return *(*p)++;
104 case TIFF_SHORT: return tget_short(p, le);
105 case TIFF_LONG : return tget_long (p, le);
110 static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, uint8_t *src, int size, int lines){
111 int c, line, pixels, code;
113 int width = s->width * (s->bpp / 8);
115 uint8_t *zbuf; unsigned long outlen;
117 if(s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE){
118 outlen = width * lines;
119 zbuf = av_malloc(outlen);
120 if(uncompress(zbuf, &outlen, src, size) != Z_OK){
121 av_log(s->avctx, AV_LOG_ERROR, "Uncompressing failed (%lu of %lu)\n", outlen, (unsigned long)width * lines);
126 for(line = 0; line < lines; line++){
127 memcpy(dst, src, width);
135 if(s->compr == TIFF_LZW){
136 if(ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF) < 0){
137 av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
141 for(line = 0; line < lines; line++){
142 if(src - ssrc > size){
143 av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");
148 memcpy(dst, src, s->width * (s->bpp / 8));
149 src += s->width * (s->bpp / 8);
152 for(pixels = 0; pixels < width;){
153 code = (int8_t)*src++;
156 if(pixels + code > width){
157 av_log(s->avctx, AV_LOG_ERROR, "Copy went out of bounds\n");
160 memcpy(dst + pixels, src, code);
163 }else if(code != -128){ // -127..-1
165 if(pixels + code > width){
166 av_log(s->avctx, AV_LOG_ERROR, "Run went out of bounds\n");
170 memset(dst + pixels, c, code);
176 pixels = ff_lzw_decode(s->lzw, dst, width);
178 av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n", pixels, width);
189 static int tiff_decode_tag(TiffContext *s, uint8_t *start, uint8_t *buf, uint8_t *end_buf, AVFrame *pic)
191 int tag, type, count, off, value = 0;
193 int i, j, ssize, soff, stride;
194 int *pal, *rp, *gp, *bp;
196 tag = tget_short(&buf, s->le);
197 type = tget_short(&buf, s->le);
198 count = tget_long(&buf, s->le);
199 off = tget_long(&buf, s->le);
206 value = tget(&buf, type, s->le);
217 }else if(type_sizes[type] * count <= 4){
223 if(buf && (buf < start || buf > end_buf)){
224 av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
236 if(count == 1) s->bpp = value;
240 s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) + ((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);
245 for(i = 0; i < count; i++) s->bpp += tget(&buf, type, s->le);
253 s->avctx->pix_fmt = PIX_FMT_PAL8;
256 s->avctx->pix_fmt = PIX_FMT_RGB24;
260 s->avctx->pix_fmt = PIX_FMT_GRAY16BE;
262 av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%i)\n", s->bpp);
267 av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%i)\n", s->bpp);
270 if(s->width != s->avctx->width || s->height != s->avctx->height){
271 if(avcodec_check_dimensions(s->avctx, s->width, s->height))
273 avcodec_set_dimensions(s->avctx, s->width, s->height);
275 if(s->picture.data[0])
276 s->avctx->release_buffer(s->avctx, &s->picture);
277 if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
278 av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
282 /* make default grayscale pal */
283 pal = s->picture.data[1];
284 for(i = 0; i < 256; i++)
285 pal[i] = i * 0x010101;
296 case TIFF_ADOBE_DEFLATE:
300 av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
304 av_log(s->avctx, AV_LOG_ERROR, "CCITT G3 compression is not supported\n");
307 av_log(s->avctx, AV_LOG_ERROR, "CCITT G4 compression is not supported\n");
310 av_log(s->avctx, AV_LOG_ERROR, "CCITT RLE compression is not supported\n");
314 av_log(s->avctx, AV_LOG_ERROR, "JPEG compression is not supported\n");
317 av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n", s->compr);
321 case TIFF_ROWSPERSTRIP:
323 av_log(s->avctx, AV_LOG_ERROR, "Incorrect value of rows per strip\n");
328 case TIFF_STRIP_OFFS:
333 s->stripdata = start + off;
336 if(s->stripdata > end_buf){
337 av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
341 case TIFF_STRIP_SIZE:
343 s->stripsizes = NULL;
344 s->stripsize = value;
347 s->stripsizes = start + off;
350 if(s->stripsizes > end_buf){
351 av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
355 av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
358 /* now we have the data and may start decoding */
359 stride = pic->linesize[0];
361 for(i = 0; i < s->height; i += s->rps){
363 ssize = tget(&s->stripsizes, type, s->le);
365 ssize = s->stripsize;
368 soff = tget(&s->stripdata, s->sot, s->le);
372 if(tiff_unpack_strip(s, dst, stride, src, ssize, FFMIN(s->rps, s->height - i)) < 0)
374 dst += s->rps * stride;
379 av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
384 stride = pic->linesize[0];
386 ssize = s->width * soff;
387 for(i = 0; i < s->height; i++) {
388 for(j = soff; j < ssize; j++)
389 src[j] += src[j - soff];
406 av_log(s->avctx, AV_LOG_ERROR, "Color mode %d is not supported\n", value);
411 if(s->avctx->pix_fmt != PIX_FMT_PAL8){
412 av_log(s->avctx, AV_LOG_ERROR, "Palette met but this is not palettized format\n");
415 pal = s->picture.data[1];
416 off = type_sizes[type];
418 gp = buf + count / 3 * off;
419 bp = buf + count / 3 * off * 2;
420 off = (type_sizes[type] - 1) << 3;
421 for(i = 0; i < count / 3; i++){
422 j = (tget(&rp, type, s->le) >> off) << 16;
423 j |= (tget(&gp, type, s->le) >> off) << 8;
424 j |= tget(&bp, type, s->le) >> off;
430 av_log(s->avctx, AV_LOG_ERROR, "Planar format is not supported\n");
438 static int decode_frame(AVCodecContext *avctx,
439 void *data, int *data_size,
440 uint8_t *buf, int buf_size)
442 TiffContext * const s = avctx->priv_data;
443 AVFrame *picture = data;
444 AVFrame * const p= (AVFrame*)&s->picture;
445 uint8_t *orig_buf = buf, *end_buf = buf + buf_size;
450 id = AV_RL16(buf); buf += 2;
451 if(id == 0x4949) le = 1;
452 else if(id == 0x4D4D) le = 0;
454 av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");
459 // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number
460 // that further identifies the file as a TIFF file"
461 if(tget_short(&buf, le) != 42){
462 av_log(avctx, AV_LOG_ERROR, "The answer to life, universe and everything is not correct!\n");
465 /* parse image file directory */
466 off = tget_long(&buf, le);
467 if(orig_buf + off + 14 >= end_buf){
468 av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
471 buf = orig_buf + off;
472 entries = tget_short(&buf, le);
473 for(i = 0; i < entries; i++){
474 if(tiff_decode_tag(s, orig_buf, buf, end_buf, p) < 0)
483 src = s->picture.data[0];
484 for(j = 0; j < s->height; j++){
485 for(i = 0; i < s->picture.linesize[0]; i++)
486 src[i] = 255 - src[i];
487 src += s->picture.linesize[0];
490 *picture= *(AVFrame*)&s->picture;
491 *data_size = sizeof(AVPicture);
496 static int tiff_init(AVCodecContext *avctx){
497 TiffContext *s = avctx->priv_data;
502 avcodec_get_frame_defaults((AVFrame*)&s->picture);
503 avctx->coded_frame= (AVFrame*)&s->picture;
504 s->picture.data[0] = NULL;
505 ff_lzw_decode_open(&s->lzw);
510 static int tiff_end(AVCodecContext *avctx)
512 TiffContext * const s = avctx->priv_data;
514 ff_lzw_decode_close(&s->lzw);
515 if(s->picture.data[0])
516 avctx->release_buffer(avctx, &s->picture);
520 AVCodec tiff_decoder = {