mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
df9b956751
It's got_frame, not data size
699 lines
20 KiB
C
699 lines
20 KiB
C
/*
|
|
* TIFF image decoder
|
|
* Copyright (c) 2006 Konstantin Shishkov
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* TIFF image decoder
|
|
* @author Konstantin Shishkov
|
|
*/
|
|
|
|
#include "avcodec.h"
|
|
#include "config.h"
|
|
#if CONFIG_ZLIB
|
|
#include <zlib.h>
|
|
#endif
|
|
#include "lzw.h"
|
|
#include "tiff.h"
|
|
#include "faxcompr.h"
|
|
#include "internal.h"
|
|
#include "mathops.h"
|
|
#include "libavutil/attributes.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "libavutil/imgutils.h"
|
|
|
|
typedef struct TiffContext {
|
|
AVCodecContext *avctx;
|
|
AVFrame picture;
|
|
|
|
int width, height;
|
|
unsigned int bpp, bppcount;
|
|
uint32_t palette[256];
|
|
int palette_is_set;
|
|
int le;
|
|
enum TiffCompr compr;
|
|
int invert;
|
|
int fax_opts;
|
|
int predictor;
|
|
int fill_order;
|
|
|
|
int strips, rps, sstype;
|
|
int sot;
|
|
const uint8_t *stripdata;
|
|
const uint8_t *stripsizes;
|
|
int stripsize, stripoff;
|
|
LZWState *lzw;
|
|
} TiffContext;
|
|
|
|
static unsigned tget_short(const uint8_t **p, int le)
|
|
{
|
|
unsigned v = le ? AV_RL16(*p) : AV_RB16(*p);
|
|
*p += 2;
|
|
return v;
|
|
}
|
|
|
|
static unsigned tget_long(const uint8_t **p, int le)
|
|
{
|
|
unsigned v = le ? AV_RL32(*p) : AV_RB32(*p);
|
|
*p += 4;
|
|
return v;
|
|
}
|
|
|
|
static unsigned 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 UINT_MAX;
|
|
}
|
|
}
|
|
|
|
#if CONFIG_ZLIB
|
|
static int tiff_uncompress(uint8_t *dst, unsigned long *len, const uint8_t *src,
|
|
int size)
|
|
{
|
|
z_stream zstream = { 0 };
|
|
int zret;
|
|
|
|
zstream.next_in = src;
|
|
zstream.avail_in = size;
|
|
zstream.next_out = dst;
|
|
zstream.avail_out = *len;
|
|
zret = inflateInit(&zstream);
|
|
if (zret != Z_OK) {
|
|
av_log(NULL, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
|
|
return zret;
|
|
}
|
|
zret = inflate(&zstream, Z_SYNC_FLUSH);
|
|
inflateEnd(&zstream);
|
|
*len = zstream.total_out;
|
|
return zret == Z_STREAM_END ? Z_OK : zret;
|
|
}
|
|
#endif
|
|
|
|
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) + 7) >> 3;
|
|
|
|
if (size <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
#if CONFIG_ZLIB
|
|
if (s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE) {
|
|
uint8_t *zbuf;
|
|
unsigned long outlen;
|
|
int ret;
|
|
outlen = width * lines;
|
|
zbuf = av_malloc(outlen);
|
|
if (!zbuf)
|
|
return AVERROR(ENOMEM);
|
|
ret = tiff_uncompress(zbuf, &outlen, src, size);
|
|
if (ret != Z_OK) {
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
"Uncompressing failed (%lu of %lu) with error %d\n", outlen,
|
|
(unsigned long)width * lines, ret);
|
|
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;
|
|
}
|
|
}
|
|
if (s->compr == TIFF_CCITT_RLE || s->compr == TIFF_G3
|
|
|| s->compr == TIFF_G4) {
|
|
int i, ret = 0;
|
|
uint8_t *src2 = av_malloc((unsigned)size +
|
|
FF_INPUT_BUFFER_PADDING_SIZE);
|
|
|
|
if (!src2) {
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
"Error allocating temporary buffer\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
if (s->fax_opts & 2) {
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
"Uncompressed fax mode is not supported (yet)\n");
|
|
av_free(src2);
|
|
return -1;
|
|
}
|
|
if (!s->fill_order) {
|
|
memcpy(src2, src, size);
|
|
} else {
|
|
for (i = 0; i < size; i++)
|
|
src2[i] = ff_reverse[src[i]];
|
|
}
|
|
memset(src2 + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
|
|
switch (s->compr) {
|
|
case TIFF_CCITT_RLE:
|
|
case TIFF_G3:
|
|
case TIFF_G4:
|
|
ret = ff_ccitt_unpack(s->avctx, src2, size, dst, lines, stride,
|
|
s->compr, s->fax_opts);
|
|
break;
|
|
}
|
|
av_free(src2);
|
|
return ret;
|
|
}
|
|
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:
|
|
if (ssrc + size - src < width)
|
|
return AVERROR_INVALIDDATA;
|
|
if (!s->fill_order) {
|
|
memcpy(dst, src, width);
|
|
} else {
|
|
int i;
|
|
for (i = 0; i < width; i++)
|
|
dst[i] = ff_reverse[src[i]];
|
|
}
|
|
src += width;
|
|
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 init_image(TiffContext *s)
|
|
{
|
|
int i, ret;
|
|
uint32_t *pal;
|
|
|
|
switch (s->bpp * 10 + s->bppcount) {
|
|
case 11:
|
|
s->avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
|
|
break;
|
|
case 81:
|
|
s->avctx->pix_fmt = AV_PIX_FMT_PAL8;
|
|
break;
|
|
case 243:
|
|
s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
|
|
break;
|
|
case 161:
|
|
s->avctx->pix_fmt = s->le ? AV_PIX_FMT_GRAY16LE : AV_PIX_FMT_GRAY16BE;
|
|
break;
|
|
case 324:
|
|
s->avctx->pix_fmt = AV_PIX_FMT_RGBA;
|
|
break;
|
|
case 483:
|
|
s->avctx->pix_fmt = s->le ? AV_PIX_FMT_RGB48LE : AV_PIX_FMT_RGB48BE;
|
|
break;
|
|
default:
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
"This format is not supported (bpp=%d, bppcount=%d)\n",
|
|
s->bpp, s->bppcount);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if (s->width != s->avctx->width || s->height != s->avctx->height) {
|
|
if ((ret = av_image_check_size(s->width, s->height, 0, s->avctx)) < 0)
|
|
return ret;
|
|
avcodec_set_dimensions(s->avctx, s->width, s->height);
|
|
}
|
|
if (s->picture.data[0])
|
|
s->avctx->release_buffer(s->avctx, &s->picture);
|
|
if ((ret = ff_get_buffer(s->avctx, &s->picture)) < 0) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
return ret;
|
|
}
|
|
if (s->avctx->pix_fmt == AV_PIX_FMT_PAL8) {
|
|
if (s->palette_is_set) {
|
|
memcpy(s->picture.data[1], s->palette, sizeof(s->palette));
|
|
} else {
|
|
/* make default grayscale pal */
|
|
pal = (uint32_t *) s->picture.data[1];
|
|
for (i = 0; i < 256; i++)
|
|
pal[i] = i * 0x010101;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int tiff_decode_tag(TiffContext *s, const uint8_t *start,
|
|
const uint8_t *buf, const uint8_t *end_buf)
|
|
{
|
|
unsigned tag, type, count, off, value = 0;
|
|
int i, j;
|
|
uint32_t *pal;
|
|
const uint8_t *rp, *gp, *bp;
|
|
|
|
if (end_buf - buf < 12)
|
|
return -1;
|
|
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 (type == 0 || type >= FF_ARRAY_ELEMS(type_sizes)) {
|
|
av_log(s->avctx, AV_LOG_DEBUG, "Unknown tiff type (%u) encountered\n",
|
|
type);
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
case TIFF_STRING:
|
|
if (count <= 4) {
|
|
buf -= 4;
|
|
break;
|
|
}
|
|
default:
|
|
value = UINT_MAX;
|
|
buf = start + off;
|
|
}
|
|
} else {
|
|
if (count <= 4 && 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:
|
|
s->bppcount = count;
|
|
if (count > 4) {
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
"This format is not supported (bpp=%d, %d components)\n",
|
|
s->bpp, count);
|
|
return -1;
|
|
}
|
|
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 && buf < end_buf; i++)
|
|
s->bpp += tget(&buf, type, s->le);
|
|
break;
|
|
default:
|
|
s->bpp = -1;
|
|
}
|
|
}
|
|
break;
|
|
case TIFF_SAMPLES_PER_PIXEL:
|
|
if (count != 1) {
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
"Samples per pixel requires a single value, many provided\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
if (s->bppcount == 1)
|
|
s->bpp *= value;
|
|
s->bppcount = value;
|
|
break;
|
|
case TIFF_COMPR:
|
|
s->compr = value;
|
|
s->predictor = 0;
|
|
switch (s->compr) {
|
|
case TIFF_RAW:
|
|
case TIFF_PACKBITS:
|
|
case TIFF_LZW:
|
|
case TIFF_CCITT_RLE:
|
|
break;
|
|
case TIFF_G3:
|
|
case TIFF_G4:
|
|
s->fax_opts = 0;
|
|
break;
|
|
case TIFF_DEFLATE:
|
|
case TIFF_ADOBE_DEFLATE:
|
|
#if CONFIG_ZLIB
|
|
break;
|
|
#else
|
|
av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
|
|
return -1;
|
|
#endif
|
|
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 (type == TIFF_LONG && value == UINT_MAX)
|
|
value = s->avctx->height;
|
|
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;
|
|
s->sstype = type;
|
|
if (s->stripsizes > end_buf) {
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
"Tag referencing position outside the image\n");
|
|
return -1;
|
|
}
|
|
break;
|
|
case TIFF_PREDICTOR:
|
|
s->predictor = value;
|
|
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_FILL_ORDER:
|
|
if (value < 1 || value > 2) {
|
|
av_log(s->avctx, AV_LOG_ERROR,
|
|
"Unknown FillOrder value %d, trying default one\n", value);
|
|
value = 1;
|
|
}
|
|
s->fill_order = value - 1;
|
|
break;
|
|
case TIFF_PAL:
|
|
pal = (uint32_t *) s->palette;
|
|
off = type_sizes[type];
|
|
if (count / 3 > 256 || end_buf - buf < count / 3 * off * 3)
|
|
return -1;
|
|
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;
|
|
}
|
|
s->palette_is_set = 1;
|
|
break;
|
|
case TIFF_PLANAR:
|
|
if (value == 2) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "Planar format is not supported\n");
|
|
return -1;
|
|
}
|
|
break;
|
|
case TIFF_T4OPTIONS:
|
|
if (s->compr == TIFF_G3)
|
|
s->fax_opts = value;
|
|
break;
|
|
case TIFF_T6OPTIONS:
|
|
if (s->compr == TIFF_G4)
|
|
s->fax_opts = value;
|
|
break;
|
|
default:
|
|
av_log(s->avctx, AV_LOG_DEBUG, "Unknown or unsupported tag %d/0X%0X\n",
|
|
tag, tag);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int decode_frame(AVCodecContext *avctx,
|
|
void *data, int *got_frame, AVPacket *avpkt)
|
|
{
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
TiffContext *const s = avctx->priv_data;
|
|
AVFrame *picture = data;
|
|
AVFrame *const p = &s->picture;
|
|
const uint8_t *orig_buf = buf, *end_buf = buf + buf_size;
|
|
unsigned off;
|
|
int id, le, ret;
|
|
int i, j, entries;
|
|
int stride;
|
|
unsigned soff, ssize;
|
|
uint8_t *dst;
|
|
|
|
//parse image header
|
|
if (end_buf - buf < 8)
|
|
return AVERROR_INVALIDDATA;
|
|
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;
|
|
s->fill_order = 0;
|
|
// 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;
|
|
}
|
|
// Reset these pointers so we can tell if they were set this frame
|
|
s->stripsizes = s->stripdata = NULL;
|
|
/* parse image file directory */
|
|
off = tget_long(&buf, le);
|
|
if (off >= UINT_MAX - 14 || end_buf - orig_buf < off + 14) {
|
|
av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
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) < 0)
|
|
return -1;
|
|
buf += 12;
|
|
}
|
|
if (!s->stripdata && !s->stripoff) {
|
|
av_log(avctx, AV_LOG_ERROR, "Image data is missing\n");
|
|
return -1;
|
|
}
|
|
/* now we have the data and may start decoding */
|
|
if ((ret = init_image(s)) < 0)
|
|
return ret;
|
|
|
|
if (s->strips == 1 && !s->stripsize) {
|
|
av_log(avctx, AV_LOG_WARNING, "Image data size missing\n");
|
|
s->stripsize = buf_size - s->stripoff;
|
|
}
|
|
stride = p->linesize[0];
|
|
dst = p->data[0];
|
|
for (i = 0; i < s->height; i += s->rps) {
|
|
if (s->stripsizes) {
|
|
if (s->stripsizes >= end_buf)
|
|
return AVERROR_INVALIDDATA;
|
|
ssize = tget(&s->stripsizes, s->sstype, s->le);
|
|
} else
|
|
ssize = s->stripsize;
|
|
|
|
if (s->stripdata) {
|
|
if (s->stripdata >= end_buf)
|
|
return AVERROR_INVALIDDATA;
|
|
soff = tget(&s->stripdata, s->sot, s->le);
|
|
} else
|
|
soff = s->stripoff;
|
|
|
|
if (soff > buf_size || ssize > buf_size - soff) {
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid strip size/offset\n");
|
|
return -1;
|
|
}
|
|
if (tiff_unpack_strip(s, dst, stride, orig_buf + soff, ssize,
|
|
FFMIN(s->rps, s->height - i)) < 0)
|
|
break;
|
|
dst += s->rps * stride;
|
|
}
|
|
if (s->predictor == 2) {
|
|
dst = p->data[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;
|
|
}
|
|
}
|
|
|
|
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 = s->picture;
|
|
*got_frame = 1;
|
|
|
|
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(&s->picture);
|
|
avctx->coded_frame = &s->picture;
|
|
ff_lzw_decode_open(&s->lzw);
|
|
ff_ccitt_unpack_init();
|
|
|
|
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 ff_tiff_decoder = {
|
|
.name = "tiff",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_TIFF,
|
|
.priv_data_size = sizeof(TiffContext),
|
|
.init = tiff_init,
|
|
.close = tiff_end,
|
|
.decode = decode_frame,
|
|
.capabilities = CODEC_CAP_DR1,
|
|
.long_name = NULL_IF_CONFIG_SMALL("TIFF image"),
|
|
};
|