2006-10-13 12:48:29 +02:00
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/*
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* TIFF image decoder
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* Copyright (c) 2006 Konstantin Shishkov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include "avcodec.h"
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#ifdef CONFIG_ZLIB
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#include <zlib.h>
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#endif
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2006-10-26 06:15:48 +02:00
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#include "lzw.h"
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2006-10-13 12:48:29 +02:00
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/* abridged list of TIFF tags */
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enum TiffTags{
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TIFF_WIDTH = 0x100,
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TIFF_HEIGHT,
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TIFF_BPP,
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TIFF_COMPR,
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TIFF_INVERT = 0x106,
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TIFF_STRIP_OFFS = 0x111,
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TIFF_ROWSPERSTRIP = 0x116,
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TIFF_STRIP_SIZE,
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TIFF_XPOS = 0x11E,
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TIFF_YPOS = 0x11F,
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TIFF_PREDICTOR = 0x13D
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};
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enum TiffCompr{
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TIFF_RAW = 1,
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TIFF_CCITT_RLE,
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TIFF_G3,
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TIFF_G4,
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TIFF_LZW,
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TIFF_JPEG,
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TIFF_NEWJPEG,
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TIFF_ADOBE_DEFLATE,
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TIFF_PACKBITS = 0x8005,
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TIFF_DEFLATE = 0x80B2
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};
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enum TiffTypes{
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TIFF_BYTE = 1,
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TIFF_STRING,
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TIFF_SHORT,
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TIFF_LONG,
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TIFF_LONGLONG
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};
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typedef struct TiffContext {
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AVCodecContext *avctx;
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AVFrame picture;
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int width, height;
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unsigned int bpp;
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int le;
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int compr;
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int strips, rps;
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int sot;
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uint8_t* stripdata;
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uint8_t* stripsizes;
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int stripsize, stripoff;
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2006-10-26 06:15:48 +02:00
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LZWState *lzw;
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2006-10-13 12:48:29 +02:00
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} TiffContext;
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static int tget_short(uint8_t **p, int le){
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int v = le ? LE_16(*p) : BE_16(*p);
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*p += 2;
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return v;
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}
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static int tget_long(uint8_t **p, int le){
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int v = le ? LE_32(*p) : BE_32(*p);
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*p += 4;
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return v;
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}
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static int tget(uint8_t **p, int type, int le){
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switch(type){
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case TIFF_BYTE : return *(*p)++;
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case TIFF_SHORT: return tget_short(p, le);
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case TIFF_LONG : return tget_long (p, le);
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default : return -1;
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}
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}
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static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, uint8_t *src, int size, int lines){
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int c, line, pixels, code;
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uint8_t *ssrc = src;
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int width = s->width * (s->bpp / 8);
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#ifdef CONFIG_ZLIB
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uint8_t *zbuf; unsigned long outlen;
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if(s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE){
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outlen = width * lines;
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if(lines != s->height){
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av_log(s->avctx, AV_LOG_ERROR, "This decoder won't decode ZLib-packed TIFF with %i lines per strip\n", lines);
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return -1;
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}
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zbuf = av_malloc(outlen);
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if(uncompress(zbuf, &outlen, src, size) != Z_OK){
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av_log(s->avctx, AV_LOG_ERROR, "Uncompressing failed (%lu of %lu)\n", outlen, (unsigned long)width * lines);
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av_free(zbuf);
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return -1;
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}
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src = zbuf;
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for(line = 0; line < lines; line++){
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memcpy(dst, src, width);
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dst += stride;
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src += width;
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}
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av_free(zbuf);
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return 0;
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}
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#endif
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2006-10-26 06:15:48 +02:00
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if(s->compr == TIFF_LZW){
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if(ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF) < 0){
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av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
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return -1;
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}
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}
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2006-10-13 12:48:29 +02:00
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for(line = 0; line < lines; line++){
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if(src - ssrc > size){
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av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");
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return -1;
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}
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switch(s->compr){
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case TIFF_RAW:
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memcpy(dst, src, s->width * (s->bpp / 8));
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src += s->width * (s->bpp / 8);
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break;
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case TIFF_PACKBITS:
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for(pixels = 0; pixels < width;){
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code = (int8_t)*src++;
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if(code >= 0){
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code++;
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if(pixels + code > width){
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av_log(s->avctx, AV_LOG_ERROR, "Copy went out of bounds\n");
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return -1;
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}
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memcpy(dst + pixels, src, code);
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src += code;
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pixels += code;
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}else if(code != -128){ // -127..-1
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code = (-code) + 1;
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if(pixels + code > width){
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av_log(s->avctx, AV_LOG_ERROR, "Run went out of bounds\n");
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return -1;
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}
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c = *src++;
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memset(dst + pixels, c, code);
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pixels += code;
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}
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}
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break;
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2006-10-26 06:15:48 +02:00
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case TIFF_LZW:
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pixels = ff_lzw_decode(s->lzw, dst, width);
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if(pixels < width){
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av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n", pixels, width);
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return -1;
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}
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break;
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2006-10-13 12:48:29 +02:00
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}
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dst += stride;
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}
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return 0;
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}
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static int tiff_decode_tag(TiffContext *s, uint8_t *start, uint8_t *buf, uint8_t *end_buf, AVFrame *pic)
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{
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int tag, type, count, off, value = 0;
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uint8_t *src, *dst;
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int i, j, ssize, soff, stride;
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tag = tget_short(&buf, s->le);
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type = tget_short(&buf, s->le);
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count = tget_long(&buf, s->le);
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off = tget_long(&buf, s->le);
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if(count == 1){
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switch(type){
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case TIFF_BYTE:
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case TIFF_SHORT:
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buf -= 4;
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value = tget(&buf, type, s->le);
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buf = NULL;
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break;
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case TIFF_LONG:
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value = off;
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buf = NULL;
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break;
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default:
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value = -1;
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buf = start + off;
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}
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}else{
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buf = start + off;
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}
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if(buf && (buf < start || buf > end_buf)){
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av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
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return -1;
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}
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switch(tag){
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case TIFF_WIDTH:
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s->width = value;
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break;
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case TIFF_HEIGHT:
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s->height = value;
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s->avctx->pix_fmt = PIX_FMT_RGB24;
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if(s->width != s->avctx->width || s->height != s->avctx->height){
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if(avcodec_check_dimensions(s->avctx, s->width, s->height))
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return -1;
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avcodec_set_dimensions(s->avctx, s->width, s->height);
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}
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if(s->picture.data[0])
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s->avctx->release_buffer(s->avctx, &s->picture);
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if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
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av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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break;
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case TIFF_BPP:
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if(count == 1) s->bpp = value;
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else{
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switch(type){
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case TIFF_BYTE:
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2006-11-13 06:28:55 +01:00
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s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) + ((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);
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2006-10-13 12:48:29 +02:00
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break;
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case TIFF_SHORT:
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case TIFF_LONG:
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2006-11-13 06:28:55 +01:00
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s->bpp = 0;
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for(i = 0; i < count; i++) s->bpp += tget(&buf, type, s->le);
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2006-10-13 12:48:29 +02:00
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break;
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default:
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s->bpp = -1;
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}
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}
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if(s->bpp != 24){
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av_log(s->avctx, AV_LOG_ERROR, "Only RGB24 is supported\n");
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return -1;
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}
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break;
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case TIFF_COMPR:
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s->compr = value;
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switch(s->compr){
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case TIFF_RAW:
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case TIFF_PACKBITS:
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2006-10-26 06:15:48 +02:00
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case TIFF_LZW:
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2006-10-13 12:48:29 +02:00
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break;
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case TIFF_DEFLATE:
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case TIFF_ADOBE_DEFLATE:
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#ifdef CONFIG_ZLIB
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break;
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#else
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av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
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return -1;
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#endif
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case TIFF_G3:
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av_log(s->avctx, AV_LOG_ERROR, "CCITT G3 compression is not supported\n");
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return -1;
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case TIFF_G4:
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av_log(s->avctx, AV_LOG_ERROR, "CCITT G4 compression is not supported\n");
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return -1;
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case TIFF_CCITT_RLE:
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av_log(s->avctx, AV_LOG_ERROR, "CCITT RLE compression is not supported\n");
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return -1;
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2006-11-13 06:29:45 +01:00
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case TIFF_JPEG:
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case TIFF_NEWJPEG:
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av_log(s->avctx, AV_LOG_ERROR, "JPEG compression is not supported\n");
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return -1;
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2006-10-13 12:48:29 +02:00
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default:
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av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n", s->compr);
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return -1;
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}
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break;
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case TIFF_ROWSPERSTRIP:
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2006-11-13 06:30:50 +01:00
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if(value < 1){
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2006-10-13 12:48:29 +02:00
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av_log(s->avctx, AV_LOG_ERROR, "Incorrect value of rows per strip\n");
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return -1;
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}
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s->rps = value;
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break;
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case TIFF_STRIP_OFFS:
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if(count == 1){
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s->stripdata = NULL;
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s->stripoff = value;
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}else
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s->stripdata = start + off;
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s->strips = count;
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s->sot = type;
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if(s->stripdata > end_buf){
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av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
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return -1;
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}
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break;
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case TIFF_STRIP_SIZE:
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if(count == 1){
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s->stripsizes = NULL;
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s->stripsize = value;
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s->strips = 1;
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}else{
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s->stripsizes = start + off;
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}
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s->strips = count;
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if(s->stripsizes > end_buf){
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av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
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return -1;
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}
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if(!pic->data[0]){
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av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
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return -1;
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}
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/* now we have the data and may start decoding */
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stride = pic->linesize[0];
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dst = pic->data[0];
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for(i = 0; i < s->height; i += s->rps){
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if(s->stripsizes)
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ssize = tget(&s->stripsizes, type, s->le);
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else
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ssize = s->stripsize;
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if(s->stripdata){
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soff = tget(&s->stripdata, s->sot, s->le);
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}else
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soff = s->stripoff;
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src = start + soff;
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if(tiff_unpack_strip(s, dst, stride, src, ssize, FFMIN(s->rps, s->height - i)) < 0)
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break;
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dst += s->rps * stride;
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}
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break;
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case TIFF_PREDICTOR:
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if(!pic->data[0]){
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av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
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return -1;
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}
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if(value == 2){
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2006-10-26 06:06:08 +02:00
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|
|
src = pic->data[0];
|
2006-10-13 12:48:29 +02:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
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 = LE_16(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;
|
|
|
|
// 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;
|
|
|
|
}
|
|
|
|
|
|
|
|
*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;
|
2006-10-26 06:15:48 +02:00
|
|
|
ff_lzw_decode_open(&s->lzw);
|
2006-10-13 12:48:29 +02:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int tiff_end(AVCodecContext *avctx)
|
|
|
|
{
|
|
|
|
TiffContext * const s = avctx->priv_data;
|
|
|
|
|
2006-10-26 06:15:48 +02:00
|
|
|
ff_lzw_decode_close(&s->lzw);
|
2006-10-13 12:48:29 +02:00
|
|
|
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
|
|
|
|
};
|