* 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"
-/* abridged list of TIFF tags */
-enum TiffTags{
- TIFF_WIDTH = 0x100,
- TIFF_HEIGHT,
- TIFF_BPP,
- TIFF_COMPR,
- TIFF_INVERT = 0x106,
- TIFF_STRIP_OFFS = 0x111,
- TIFF_ROWSPERSTRIP = 0x116,
- TIFF_STRIP_SIZE,
- TIFF_XPOS = 0x11E,
- TIFF_YPOS = 0x11F,
- TIFF_PREDICTOR = 0x13D
-};
-
-enum TiffCompr{
- TIFF_RAW = 1,
- TIFF_CCITT_RLE,
- TIFF_G3,
- TIFF_G4,
- TIFF_LZW,
- TIFF_JPEG,
- TIFF_NEWJPEG,
- TIFF_ADOBE_DEFLATE,
- TIFF_PACKBITS = 0x8005,
- TIFF_DEFLATE = 0x80B2
-};
-
-enum TiffTypes{
- TIFF_BYTE = 1,
- TIFF_STRING,
- TIFF_SHORT,
- TIFF_LONG,
- TIFF_LONGLONG
-};
typedef struct TiffContext {
AVCodecContext *avctx;
unsigned int bpp;
int le;
int compr;
+ int invert;
int strips, rps;
int sot;
- uint8_t* stripdata;
- uint8_t* stripsizes;
+ const uint8_t* stripdata;
+ const uint8_t* stripsizes;
int stripsize, stripoff;
LZWState *lzw;
} TiffContext;
-static int tget_short(uint8_t **p, int le){
- int v = le ? LE_16(*p) : BE_16(*p);
+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(uint8_t **p, int le){
- int v = le ? LE_32(*p) : BE_32(*p);
+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(uint8_t **p, int type, int le){
+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);
}
}
-static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, uint8_t *src, int size, int lines){
+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;
- uint8_t *ssrc = src;
+ 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;
- if(lines != s->height){
- av_log(s->avctx, AV_LOG_ERROR, "This decoder won't decode ZLib-packed TIFF with %i lines per strip\n", lines);
- return -1;
- }
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);
}
-static int tiff_decode_tag(TiffContext *s, uint8_t *start, uint8_t *buf, uint8_t *end_buf, AVFrame *pic)
+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;
- uint8_t *src, *dst;
+ 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);
value = -1;
buf = start + off;
}
+ }else if(type_sizes[type] * count <= 4){
+ buf -= 4;
}else{
buf = start + off;
}
break;
case TIFF_HEIGHT:
s->height = value;
- s->avctx->pix_fmt = PIX_FMT_RGB24;
- 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;
- }
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);
+ s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) + ((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);
break;
case TIFF_SHORT:
case TIFF_LONG:
- s->bpp = tget(&buf, type, s->le) + tget(&buf, type, s->le) + tget(&buf, type, s->le);
+ s->bpp = 0;
+ for(i = 0; i < count; i++) s->bpp += tget(&buf, type, s->le);
break;
default:
s->bpp = -1;
}
}
- if(s->bpp != 24){
- av_log(s->avctx, AV_LOG_ERROR, "Only RGB24 is supported\n");
+ 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;
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 || value > s->height){
+ if(value < 1){
av_log(s->avctx, AV_LOG_ERROR, "Incorrect value of rows per strip\n");
return -1;
}
}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;
}
if(value == 2){
- src = pic->data[0];
+ 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++)
- src[j] += src[j - soff];
- src += stride;
+ 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,
- uint8_t *buf, int buf_size)
+ const 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;
+ const 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;
+ id = AV_RL16(buf); buf += 2;
if(id == 0x4949) le = 1;
else if(id == 0x4D4D) le = 0;
else{
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){
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 int tiff_init(AVCodecContext *avctx){
+static av_cold int tiff_init(AVCodecContext *avctx){
TiffContext *s = avctx->priv_data;
s->width = 0;
return 0;
}
-static int tiff_end(AVCodecContext *avctx)
+static av_cold int tiff_end(AVCodecContext *avctx)
{
TiffContext * const s = avctx->priv_data;
tiff_end,
decode_frame,
0,
- NULL
+ NULL,
+ .long_name = NULL_IF_CONFIG_SMALL("TIFF image"),
};
projects / ffmpeg / blobdiff