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ffmpeg / libavcodec / tiff.c @ 640b73e1

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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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 * TIFF image decoder
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 * @file tiff.c
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 * @author Konstantin Shishkov
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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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#include "lzw.h"
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#include "tiff.h"
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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 invert;
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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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    LZWState *lzw;
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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 ? AV_RL16(*p) : AV_RB16(*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 ? AV_RL32(*p) : AV_RB32(*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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        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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    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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    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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        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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        }
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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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    uint32_t *pal;
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    uint8_t *rp, *gp, *bp;
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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 if(type_sizes[type] * count <= 4){
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        buf -= 4;
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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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        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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                s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) + ((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);
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                break;
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            case TIFF_SHORT:
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            case TIFF_LONG:
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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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                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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        switch(s->bpp){
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        case 8:
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            s->avctx->pix_fmt = PIX_FMT_PAL8;
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            break;
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        case 24:
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            s->avctx->pix_fmt = PIX_FMT_RGB24;
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            break;
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        case 16:
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            if(count == 1){
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                s->avctx->pix_fmt = PIX_FMT_GRAY16BE;
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            }else{
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                av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%i)\n", s->bpp);
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                return -1;
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            }
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            break;
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        default:
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            av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%i)\n", s->bpp);
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            return -1;
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        }
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        if(s->width != s->avctx->width || s->height != s->avctx->height){
236
            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){
243
            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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        if(s->bpp == 8){
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            /* make default grayscale pal */
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            pal = (uint32_t *) s->picture.data[1];
249
            for(i = 0; i < 256; i++)
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                pal[i] = i * 0x010101;
251
        }
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        break;
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    case TIFF_COMPR:
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        s->compr = value;
255
        switch(s->compr){
256
        case TIFF_RAW:
257
        case TIFF_PACKBITS:
258
        case TIFF_LZW:
259
            break;
260
        case TIFF_DEFLATE:
261
        case TIFF_ADOBE_DEFLATE:
262
#ifdef CONFIG_ZLIB
263
            break;
264
#else
265
            av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
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            return -1;
267
#endif
268
        case TIFF_G3:
269
            av_log(s->avctx, AV_LOG_ERROR, "CCITT G3 compression is not supported\n");
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            return -1;
271
        case TIFF_G4:
272
            av_log(s->avctx, AV_LOG_ERROR, "CCITT G4 compression is not supported\n");
273
            return -1;
274
        case TIFF_CCITT_RLE:
275
            av_log(s->avctx, AV_LOG_ERROR, "CCITT RLE compression is not supported\n");
276
            return -1;
277
        case TIFF_JPEG:
278
        case TIFF_NEWJPEG:
279
            av_log(s->avctx, AV_LOG_ERROR, "JPEG compression is not supported\n");
280
            return -1;
281
        default:
282
            av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n", s->compr);
283
            return -1;
284
        }
285
        break;
286
    case TIFF_ROWSPERSTRIP:
287
        if(value < 1){
288
            av_log(s->avctx, AV_LOG_ERROR, "Incorrect value of rows per strip\n");
289
            return -1;
290
        }
291
        s->rps = value;
292
        break;
293
    case TIFF_STRIP_OFFS:
294
        if(count == 1){
295
            s->stripdata = NULL;
296
            s->stripoff = value;
297
        }else
298
            s->stripdata = start + off;
299
        s->strips = count;
300
        if(s->strips == 1) s->rps = s->height;
301
        s->sot = type;
302
        if(s->stripdata > end_buf){
303
            av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
304
            return -1;
305
        }
306
        break;
307
    case TIFF_STRIP_SIZE:
308
        if(count == 1){
309
            s->stripsizes = NULL;
310
            s->stripsize = value;
311
            s->strips = 1;
312
        }else{
313
            s->stripsizes = start + off;
314
        }
315
        s->strips = count;
316
        if(s->stripsizes > end_buf){
317
            av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
318
            return -1;
319
        }
320
        if(!pic->data[0]){
321
            av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
322
            return -1;
323
        }
324
        /* now we have the data and may start decoding */
325
        stride = pic->linesize[0];
326
        dst = pic->data[0];
327
        for(i = 0; i < s->height; i += s->rps){
328
            if(s->stripsizes)
329
                ssize = tget(&s->stripsizes, type, s->le);
330
            else
331
                ssize = s->stripsize;
332

    
333
            if(s->stripdata){
334
                soff = tget(&s->stripdata, s->sot, s->le);
335
            }else
336
                soff = s->stripoff;
337
            src = start + soff;
338
            if(tiff_unpack_strip(s, dst, stride, src, ssize, FFMIN(s->rps, s->height - i)) < 0)
339
                break;
340
            dst += s->rps * stride;
341
        }
342
        break;
343
    case TIFF_PREDICTOR:
344
        if(!pic->data[0]){
345
            av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
346
            return -1;
347
        }
348
        if(value == 2){
349
            src = pic->data[0];
350
            stride = pic->linesize[0];
351
            soff = s->bpp >> 3;
352
            ssize = s->width * soff;
353
            for(i = 0; i < s->height; i++) {
354
                for(j = soff; j < ssize; j++)
355
                    src[j] += src[j - soff];
356
                src += stride;
357
            }
358
        }
359
        break;
360
    case TIFF_INVERT:
361
        switch(value){
362
        case 0:
363
            s->invert = 1;
364
            break;
365
        case 1:
366
            s->invert = 0;
367
            break;
368
        case 2:
369
        case 3:
370
            break;
371
        default:
372
            av_log(s->avctx, AV_LOG_ERROR, "Color mode %d is not supported\n", value);
373
            return -1;
374
        }
375
        break;
376
    case TIFF_PAL:
377
        if(s->avctx->pix_fmt != PIX_FMT_PAL8){
378
            av_log(s->avctx, AV_LOG_ERROR, "Palette met but this is not palettized format\n");
379
            return -1;
380
        }
381
        pal = (uint32_t *) s->picture.data[1];
382
        off = type_sizes[type];
383
        rp = buf;
384
        gp = buf + count / 3 * off;
385
        bp = buf + count / 3 * off * 2;
386
        off = (type_sizes[type] - 1) << 3;
387
        for(i = 0; i < count / 3; i++){
388
            j = (tget(&rp, type, s->le) >> off) << 16;
389
            j |= (tget(&gp, type, s->le) >> off) << 8;
390
            j |= tget(&bp, type, s->le) >> off;
391
            pal[i] = j;
392
        }
393
        break;
394
    case TIFF_PLANAR:
395
        if(value == 2){
396
            av_log(s->avctx, AV_LOG_ERROR, "Planar format is not supported\n");
397
            return -1;
398
        }
399
        break;
400
    }
401
    return 0;
402
}
403

    
404
static int decode_frame(AVCodecContext *avctx,
405
                        void *data, int *data_size,
406
                        uint8_t *buf, int buf_size)
407
{
408
    TiffContext * const s = avctx->priv_data;
409
    AVFrame *picture = data;
410
    AVFrame * const p= (AVFrame*)&s->picture;
411
    uint8_t *orig_buf = buf, *end_buf = buf + buf_size;
412
    int id, le, off;
413
    int i, entries;
414

    
415
    //parse image header
416
    id = AV_RL16(buf); buf += 2;
417
    if(id == 0x4949) le = 1;
418
    else if(id == 0x4D4D) le = 0;
419
    else{
420
        av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");
421
        return -1;
422
    }
423
    s->le = le;
424
    s->invert = 0;
425
    // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number
426
    // that further identifies the file as a TIFF file"
427
    if(tget_short(&buf, le) != 42){
428
        av_log(avctx, AV_LOG_ERROR, "The answer to life, universe and everything is not correct!\n");
429
        return -1;
430
    }
431
    /* parse image file directory */
432
    off = tget_long(&buf, le);
433
    if(orig_buf + off + 14 >= end_buf){
434
        av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
435
        return -1;
436
    }
437
    buf = orig_buf + off;
438
    entries = tget_short(&buf, le);
439
    for(i = 0; i < entries; i++){
440
        if(tiff_decode_tag(s, orig_buf, buf, end_buf, p) < 0)
441
            return -1;
442
        buf += 12;
443
    }
444

    
445
    if(s->invert){
446
        uint8_t *src;
447
        int j;
448

    
449
        src = s->picture.data[0];
450
        for(j = 0; j < s->height; j++){
451
            for(i = 0; i < s->picture.linesize[0]; i++)
452
                src[i] = 255 - src[i];
453
            src += s->picture.linesize[0];
454
        }
455
    }
456
    *picture= *(AVFrame*)&s->picture;
457
    *data_size = sizeof(AVPicture);
458

    
459
    return buf_size;
460
}
461

    
462
static int tiff_init(AVCodecContext *avctx){
463
    TiffContext *s = avctx->priv_data;
464

    
465
    s->width = 0;
466
    s->height = 0;
467
    s->avctx = avctx;
468
    avcodec_get_frame_defaults((AVFrame*)&s->picture);
469
    avctx->coded_frame= (AVFrame*)&s->picture;
470
    s->picture.data[0] = NULL;
471
    ff_lzw_decode_open(&s->lzw);
472

    
473
    return 0;
474
}
475

    
476
static int tiff_end(AVCodecContext *avctx)
477
{
478
    TiffContext * const s = avctx->priv_data;
479

    
480
    ff_lzw_decode_close(&s->lzw);
481
    if(s->picture.data[0])
482
        avctx->release_buffer(avctx, &s->picture);
483
    return 0;
484
}
485

    
486
AVCodec tiff_decoder = {
487
    "tiff",
488
    CODEC_TYPE_VIDEO,
489
    CODEC_ID_TIFF,
490
    sizeof(TiffContext),
491
    tiff_init,
492
    NULL,
493
    tiff_end,
494
    decode_frame,
495
    0,
496
    NULL
497
};