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ffmpeg/libavcodec/tiff.c

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/*
* TIFF image decoder
* Copyright (c) 2006 Konstantin Shishkov
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* TIFF image decoder
* @file tiff.c
* @author Konstantin Shishkov
*/
#include "avcodec.h"
#ifdef CONFIG_ZLIB
#include <zlib.h>
#endif
#include "lzw.h"
#include "tiff.h"
typedef struct TiffContext {
AVCodecContext *avctx;
AVFrame picture;
int width, height;
unsigned int bpp;
int le;
int compr;
int invert;
int strips, rps;
int sot;
const uint8_t* stripdata;
const uint8_t* stripsizes;
int stripsize, stripoff;
LZWState *lzw;
} TiffContext;
static int tget_short(const uint8_t **p, int le){
int v = le ? AV_RL16(*p) : AV_RB16(*p);
*p += 2;
return v;
}
static int tget_long(const uint8_t **p, int le){
int v = le ? AV_RL32(*p) : AV_RB32(*p);
*p += 4;
return v;
}
static int tget(const uint8_t **p, int type, int le){
switch(type){
case TIFF_BYTE : return *(*p)++;
case TIFF_SHORT: return tget_short(p, le);
case TIFF_LONG : return tget_long (p, le);
default : return -1;
}
}
static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uint8_t *src, int size, int lines){
int c, line, pixels, code;
const uint8_t *ssrc = src;
int width = s->width * (s->bpp / 8);
#ifdef CONFIG_ZLIB
uint8_t *zbuf; unsigned long outlen;
if(s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE){
outlen = width * lines;
zbuf = av_malloc(outlen);
if(uncompress(zbuf, &outlen, src, size) != Z_OK){
av_log(s->avctx, AV_LOG_ERROR, "Uncompressing failed (%lu of %lu)\n", outlen, (unsigned long)width * lines);
av_free(zbuf);
return -1;
}
src = zbuf;
for(line = 0; line < lines; line++){
memcpy(dst, src, width);
dst += stride;
src += width;
}
av_free(zbuf);
return 0;
}
#endif
if(s->compr == TIFF_LZW){
if(ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF) < 0){
av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
return -1;
}
}
for(line = 0; line < lines; line++){
if(src - ssrc > size){
av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");
return -1;
}
switch(s->compr){
case TIFF_RAW:
memcpy(dst, src, s->width * (s->bpp / 8));
src += s->width * (s->bpp / 8);
break;
case TIFF_PACKBITS:
for(pixels = 0; pixels < width;){
code = (int8_t)*src++;
if(code >= 0){
code++;
if(pixels + code > width){
av_log(s->avctx, AV_LOG_ERROR, "Copy went out of bounds\n");
return -1;
}
memcpy(dst + pixels, src, code);
src += code;
pixels += code;
}else if(code != -128){ // -127..-1
code = (-code) + 1;
if(pixels + code > width){
av_log(s->avctx, AV_LOG_ERROR, "Run went out of bounds\n");
return -1;
}
c = *src++;
memset(dst + pixels, c, code);
pixels += code;
}
}
break;
case TIFF_LZW:
pixels = ff_lzw_decode(s->lzw, dst, width);
if(pixels < width){
av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n", pixels, width);
return -1;
}
break;
}
dst += stride;
}
return 0;
}
static int tiff_decode_tag(TiffContext *s, const uint8_t *start, const uint8_t *buf, const uint8_t *end_buf, AVFrame *pic)
{
int tag, type, count, off, value = 0;
const uint8_t *src;
uint8_t *dst;
int i, j, ssize, soff, stride;
uint32_t *pal;
const uint8_t *rp, *gp, *bp;
tag = tget_short(&buf, s->le);
type = tget_short(&buf, s->le);
count = tget_long(&buf, s->le);
off = tget_long(&buf, s->le);
if(count == 1){
switch(type){
case TIFF_BYTE:
case TIFF_SHORT:
buf -= 4;
value = tget(&buf, type, s->le);
buf = NULL;
break;
case TIFF_LONG:
value = off;
buf = NULL;
break;
default:
value = -1;
buf = start + off;
}
}else if(type_sizes[type] * count <= 4){
buf -= 4;
}else{
buf = start + off;
}
if(buf && (buf < start || buf > end_buf)){
av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
return -1;
}
switch(tag){
case TIFF_WIDTH:
s->width = value;
break;
case TIFF_HEIGHT:
s->height = value;
break;
case TIFF_BPP:
if(count == 1) s->bpp = value;
else{
switch(type){
case TIFF_BYTE:
s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) + ((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);
break;
case TIFF_SHORT:
case TIFF_LONG:
s->bpp = 0;
for(i = 0; i < count; i++) s->bpp += tget(&buf, type, s->le);
break;
default:
s->bpp = -1;
}
}
switch(s->bpp){
case 8:
s->avctx->pix_fmt = PIX_FMT_PAL8;
break;
case 24:
s->avctx->pix_fmt = PIX_FMT_RGB24;
break;
case 16:
if(count == 1){
s->avctx->pix_fmt = PIX_FMT_GRAY16BE;
}else{
av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%i)\n", s->bpp);
return -1;
}
break;
default:
av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%i)\n", s->bpp);
return -1;
}
if(s->width != s->avctx->width || s->height != s->avctx->height){
if(avcodec_check_dimensions(s->avctx, s->width, s->height))
return -1;
avcodec_set_dimensions(s->avctx, s->width, s->height);
}
if(s->picture.data[0])
s->avctx->release_buffer(s->avctx, &s->picture);
if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
if(s->bpp == 8){
/* make default grayscale pal */
pal = (uint32_t *) s->picture.data[1];
for(i = 0; i < 256; i++)
pal[i] = i * 0x010101;
}
break;
case TIFF_COMPR:
s->compr = value;
switch(s->compr){
case TIFF_RAW:
case TIFF_PACKBITS:
case TIFF_LZW:
break;
case TIFF_DEFLATE:
case TIFF_ADOBE_DEFLATE:
#ifdef CONFIG_ZLIB
break;
#else
av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
return -1;
#endif
case TIFF_G3:
av_log(s->avctx, AV_LOG_ERROR, "CCITT G3 compression is not supported\n");
return -1;
case TIFF_G4:
av_log(s->avctx, AV_LOG_ERROR, "CCITT G4 compression is not supported\n");
return -1;
case TIFF_CCITT_RLE:
av_log(s->avctx, AV_LOG_ERROR, "CCITT RLE compression is not supported\n");
return -1;
case TIFF_JPEG:
case TIFF_NEWJPEG:
av_log(s->avctx, AV_LOG_ERROR, "JPEG compression is not supported\n");
return -1;
default:
av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n", s->compr);
return -1;
}
break;
case TIFF_ROWSPERSTRIP:
if(value < 1){
av_log(s->avctx, AV_LOG_ERROR, "Incorrect value of rows per strip\n");
return -1;
}
s->rps = value;
break;
case TIFF_STRIP_OFFS:
if(count == 1){
s->stripdata = NULL;
s->stripoff = value;
}else
s->stripdata = start + off;
s->strips = count;
if(s->strips == 1) s->rps = s->height;
s->sot = type;
if(s->stripdata > end_buf){
av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
return -1;
}
break;
case TIFF_STRIP_SIZE:
if(count == 1){
s->stripsizes = NULL;
s->stripsize = value;
s->strips = 1;
}else{
s->stripsizes = start + off;
}
s->strips = count;
if(s->stripsizes > end_buf){
av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
return -1;
}
if(!pic->data[0]){
av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
return -1;
}
/* now we have the data and may start decoding */
stride = pic->linesize[0];
dst = pic->data[0];
for(i = 0; i < s->height; i += s->rps){
if(s->stripsizes)
ssize = tget(&s->stripsizes, type, s->le);
else
ssize = s->stripsize;
if(s->stripdata){
soff = tget(&s->stripdata, s->sot, s->le);
}else
soff = s->stripoff;
src = start + soff;
if(tiff_unpack_strip(s, dst, stride, src, ssize, FFMIN(s->rps, s->height - i)) < 0)
break;
dst += s->rps * stride;
}
break;
case TIFF_PREDICTOR:
if(!pic->data[0]){
av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
return -1;
}
if(value == 2){
dst = pic->data[0];
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++)
dst[j] += dst[j - soff];
dst += stride;
}
}
break;
case TIFF_INVERT:
switch(value){
case 0:
s->invert = 1;
break;
case 1:
s->invert = 0;
break;
case 2:
case 3:
break;
default:
av_log(s->avctx, AV_LOG_ERROR, "Color mode %d is not supported\n", value);
return -1;
}
break;
case TIFF_PAL:
if(s->avctx->pix_fmt != PIX_FMT_PAL8){
av_log(s->avctx, AV_LOG_ERROR, "Palette met but this is not palettized format\n");
return -1;
}
pal = (uint32_t *) s->picture.data[1];
off = type_sizes[type];
rp = buf;
gp = buf + count / 3 * off;
bp = buf + count / 3 * off * 2;
off = (type_sizes[type] - 1) << 3;
for(i = 0; i < count / 3; i++){
j = (tget(&rp, type, s->le) >> off) << 16;
j |= (tget(&gp, type, s->le) >> off) << 8;
j |= tget(&bp, type, s->le) >> off;
pal[i] = j;
}
break;
case TIFF_PLANAR:
if(value == 2){
av_log(s->avctx, AV_LOG_ERROR, "Planar format is not supported\n");
return -1;
}
break;
}
return 0;
}
static int decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
const uint8_t *buf, int buf_size)
{
TiffContext * const s = avctx->priv_data;
AVFrame *picture = data;
AVFrame * const p= (AVFrame*)&s->picture;
const uint8_t *orig_buf = buf, *end_buf = buf + buf_size;
int id, le, off;
int i, entries;
//parse image header
id = AV_RL16(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;
s->invert = 0;
s->compr = TIFF_RAW;
// 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;
}
if(s->invert){
uint8_t *src;
int j;
src = s->picture.data[0];
for(j = 0; j < s->height; j++){
for(i = 0; i < s->picture.linesize[0]; i++)
src[i] = 255 - src[i];
src += s->picture.linesize[0];
}
}
*picture= *(AVFrame*)&s->picture;
*data_size = sizeof(AVPicture);
return buf_size;
}
static av_cold 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;
ff_lzw_decode_open(&s->lzw);
return 0;
}
static av_cold int tiff_end(AVCodecContext *avctx)
{
TiffContext * const s = avctx->priv_data;
ff_lzw_decode_close(&s->lzw);
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
};
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