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libavcodec/tiff.c

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00001 /*
00002  * Copyright (c) 2006 Konstantin Shishkov
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00027 #include "avcodec.h"
00028 #if CONFIG_ZLIB
00029 #include <zlib.h>
00030 #endif
00031 #include "lzw.h"
00032 #include "tiff.h"
00033 #include "faxcompr.h"
00034 #include "libavutil/common.h"
00035 #include "libavutil/intreadwrite.h"
00036 #include "libavutil/imgutils.h"
00037 
00038 typedef struct TiffContext {
00039     AVCodecContext *avctx;
00040     AVFrame picture;
00041 
00042     int width, height;
00043     unsigned int bpp, bppcount;
00044     uint32_t palette[256];
00045     int palette_is_set;
00046     int le;
00047     enum TiffCompr compr;
00048     int invert;
00049     int fax_opts;
00050     int predictor;
00051     int fill_order;
00052 
00053     int strips, rps, sstype;
00054     int sot;
00055     const uint8_t* stripdata;
00056     const uint8_t* stripsizes;
00057     int stripsize, stripoff;
00058     LZWState *lzw;
00059 } TiffContext;
00060 
00061 static unsigned tget_short(const uint8_t **p, int le) {
00062     unsigned v = le ? AV_RL16(*p) : AV_RB16(*p);
00063     *p += 2;
00064     return v;
00065 }
00066 
00067 static unsigned tget_long(const uint8_t **p, int le) {
00068     unsigned v = le ? AV_RL32(*p) : AV_RB32(*p);
00069     *p += 4;
00070     return v;
00071 }
00072 
00073 static unsigned tget(const uint8_t **p, int type, int le) {
00074     switch(type){
00075     case TIFF_BYTE : return *(*p)++;
00076     case TIFF_SHORT: return tget_short(p, le);
00077     case TIFF_LONG : return tget_long (p, le);
00078     default        : return UINT_MAX;
00079     }
00080 }
00081 
00082 #if CONFIG_ZLIB
00083 static int tiff_uncompress(uint8_t *dst, unsigned long *len, const uint8_t *src, int size)
00084 {
00085     z_stream zstream;
00086     int zret;
00087 
00088     memset(&zstream, 0, sizeof(zstream));
00089     zstream.next_in = src;
00090     zstream.avail_in = size;
00091     zstream.next_out = dst;
00092     zstream.avail_out = *len;
00093     zret = inflateInit(&zstream);
00094     if (zret != Z_OK) {
00095         av_log(NULL, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
00096         return zret;
00097     }
00098     zret = inflate(&zstream, Z_SYNC_FLUSH);
00099     inflateEnd(&zstream);
00100     *len = zstream.total_out;
00101     return zret == Z_STREAM_END ? Z_OK : zret;
00102 }
00103 #endif
00104 
00105 static void av_always_inline horizontal_fill(unsigned int bpp, uint8_t* dst,
00106                                              int usePtr, const uint8_t *src,
00107                                              uint8_t c, int width, int offset)
00108 {
00109     switch (bpp) {
00110     case 1:
00111         while (--width >= 0) {
00112             dst[(width+offset)*8+7] = (usePtr ? src[width] : c)      & 0x1;
00113             dst[(width+offset)*8+6] = (usePtr ? src[width] : c) >> 1 & 0x1;
00114             dst[(width+offset)*8+5] = (usePtr ? src[width] : c) >> 2 & 0x1;
00115             dst[(width+offset)*8+4] = (usePtr ? src[width] : c) >> 3 & 0x1;
00116             dst[(width+offset)*8+3] = (usePtr ? src[width] : c) >> 4 & 0x1;
00117             dst[(width+offset)*8+2] = (usePtr ? src[width] : c) >> 5 & 0x1;
00118             dst[(width+offset)*8+1] = (usePtr ? src[width] : c) >> 6 & 0x1;
00119             dst[(width+offset)*8+0] = (usePtr ? src[width] : c) >> 7;
00120         }
00121         break;
00122     case 2:
00123         while (--width >= 0) {
00124             dst[(width+offset)*4+3] = (usePtr ? src[width] : c) & 0x3;
00125             dst[(width+offset)*4+2] = (usePtr ? src[width] : c) >> 2 & 0x3;
00126             dst[(width+offset)*4+1] = (usePtr ? src[width] : c) >> 4 & 0x3;
00127             dst[(width+offset)*4+0] = (usePtr ? src[width] : c) >> 6;
00128         }
00129         break;
00130     case 4:
00131         while (--width >= 0) {
00132             dst[(width+offset)*2+1] = (usePtr ? src[width] : c) & 0xF;
00133             dst[(width+offset)*2+0] = (usePtr ? src[width] : c) >> 4;
00134         }
00135         break;
00136     default:
00137         if (usePtr) {
00138             memcpy(dst + offset, src, width);
00139         } else {
00140             memset(dst + offset, c, width);
00141         }
00142     }
00143 }
00144 
00145 static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uint8_t *src, int size, int lines){
00146     int c, line, pixels, code;
00147     const uint8_t *ssrc = src;
00148     int width = ((s->width * s->bpp) + 7) >> 3;
00149 #if CONFIG_ZLIB
00150     uint8_t *zbuf; unsigned long outlen;
00151 
00152     if(s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE){
00153         int ret;
00154         outlen = width * lines;
00155         zbuf = av_malloc(outlen);
00156         ret = tiff_uncompress(zbuf, &outlen, src, size);
00157         if(ret != Z_OK){
00158             av_log(s->avctx, AV_LOG_ERROR, "Uncompressing failed (%lu of %lu) with error %d\n", outlen, (unsigned long)width * lines, ret);
00159             av_free(zbuf);
00160             return -1;
00161         }
00162         src = zbuf;
00163         for(line = 0; line < lines; line++){
00164             if(s->bpp < 8 && s->avctx->pix_fmt == PIX_FMT_PAL8){
00165                 horizontal_fill(s->bpp, dst, 1, src, 0, width, 0);
00166             }else{
00167                 memcpy(dst, src, width);
00168             }
00169             dst += stride;
00170             src += width;
00171         }
00172         av_free(zbuf);
00173         return 0;
00174     }
00175 #endif
00176     if(s->compr == TIFF_LZW){
00177         if(ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF) < 0){
00178             av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
00179             return -1;
00180         }
00181     }
00182     if(s->compr == TIFF_CCITT_RLE || s->compr == TIFF_G3 || s->compr == TIFF_G4){
00183         int i, ret = 0;
00184         uint8_t *src2 = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
00185 
00186         if(!src2 || (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE < (unsigned)size){
00187             av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");
00188             return -1;
00189         }
00190         if(s->fax_opts & 2){
00191             av_log(s->avctx, AV_LOG_ERROR, "Uncompressed fax mode is not supported (yet)\n");
00192             av_free(src2);
00193             return -1;
00194         }
00195         if(!s->fill_order){
00196             memcpy(src2, src, size);
00197         }else{
00198             for(i = 0; i < size; i++)
00199                 src2[i] = av_reverse[src[i]];
00200         }
00201         memset(src2+size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
00202         switch(s->compr){
00203         case TIFF_CCITT_RLE:
00204         case TIFF_G3:
00205         case TIFF_G4:
00206             ret = ff_ccitt_unpack(s->avctx, src2, size, dst, lines, stride, s->compr, s->fax_opts);
00207             break;
00208         }
00209         if (s->bpp < 8 && s->avctx->pix_fmt == PIX_FMT_PAL8)
00210             for (line = 0; line < lines; line++) {
00211                 horizontal_fill(s->bpp, dst, 1, dst, 0, width, 0);
00212                 dst += stride;
00213             }
00214         av_free(src2);
00215         return ret;
00216     }
00217     for(line = 0; line < lines; line++){
00218         if(src - ssrc > size){
00219             av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");
00220             return -1;
00221         }
00222         switch(s->compr){
00223         case TIFF_RAW:
00224             if (ssrc + size - src < width)
00225                 return AVERROR_INVALIDDATA;
00226             if (!s->fill_order) {
00227                 horizontal_fill(s->bpp * (s->avctx->pix_fmt == PIX_FMT_PAL8),
00228                                 dst, 1, src, 0, width, 0);
00229             } else {
00230                 int i;
00231                 for (i = 0; i < width; i++)
00232                     dst[i] = av_reverse[src[i]];
00233             }
00234             src += width;
00235             break;
00236         case TIFF_PACKBITS:
00237             for(pixels = 0; pixels < width;){
00238                 code = (int8_t)*src++;
00239                 if(code >= 0){
00240                     code++;
00241                     if(pixels + code > width){
00242                         av_log(s->avctx, AV_LOG_ERROR, "Copy went out of bounds\n");
00243                         return -1;
00244                     }
00245                     horizontal_fill(s->bpp * (s->avctx->pix_fmt == PIX_FMT_PAL8),
00246                                     dst, 1, src, 0, code, pixels);
00247                     src += code;
00248                     pixels += code;
00249                 }else if(code != -128){ // -127..-1
00250                     code = (-code) + 1;
00251                     if(pixels + code > width){
00252                         av_log(s->avctx, AV_LOG_ERROR, "Run went out of bounds\n");
00253                         return -1;
00254                     }
00255                     c = *src++;
00256                     horizontal_fill(s->bpp * (s->avctx->pix_fmt == PIX_FMT_PAL8),
00257                                     dst, 0, NULL, c, code, pixels);
00258                     pixels += code;
00259                 }
00260             }
00261             break;
00262         case TIFF_LZW:
00263             pixels = ff_lzw_decode(s->lzw, dst, width);
00264             if(pixels < width){
00265                 av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n", pixels, width);
00266                 return -1;
00267             }
00268             if (s->bpp < 8 && s->avctx->pix_fmt == PIX_FMT_PAL8)
00269                 horizontal_fill(s->bpp, dst, 1, dst, 0, width, 0);
00270             break;
00271         }
00272         dst += stride;
00273     }
00274     return 0;
00275 }
00276 
00277 static int init_image(TiffContext *s)
00278 {
00279     int i, ret;
00280     uint32_t *pal;
00281 
00282     switch (s->bpp * 10 + s->bppcount) {
00283     case 11:
00284         if (!s->palette_is_set) {
00285             s->avctx->pix_fmt = PIX_FMT_MONOBLACK;
00286             break;
00287         }
00288     case 21:
00289     case 41:
00290     case 81:
00291         s->avctx->pix_fmt = PIX_FMT_PAL8;
00292         break;
00293     case 243:
00294         s->avctx->pix_fmt = PIX_FMT_RGB24;
00295         break;
00296     case 161:
00297         s->avctx->pix_fmt = PIX_FMT_GRAY16BE;
00298         break;
00299     case 162:
00300         s->avctx->pix_fmt = PIX_FMT_GRAY8A;
00301         break;
00302     case 324:
00303         s->avctx->pix_fmt = PIX_FMT_RGBA;
00304         break;
00305     case 483:
00306         s->avctx->pix_fmt = s->le ? PIX_FMT_RGB48LE : PIX_FMT_RGB48BE;
00307         break;
00308     case 644:
00309         s->avctx->pix_fmt = s->le ? PIX_FMT_RGBA64LE : PIX_FMT_RGBA64BE;
00310         break;
00311     default:
00312         av_log(s->avctx, AV_LOG_ERROR,
00313                "This format is not supported (bpp=%d, bppcount=%d)\n",
00314                s->bpp, s->bppcount);
00315         return AVERROR_INVALIDDATA;
00316     }
00317     if (s->width != s->avctx->width || s->height != s->avctx->height) {
00318         if ((ret = av_image_check_size(s->width, s->height, 0, s->avctx)) < 0)
00319             return ret;
00320         avcodec_set_dimensions(s->avctx, s->width, s->height);
00321     }
00322     if (s->picture.data[0])
00323         s->avctx->release_buffer(s->avctx, &s->picture);
00324     if ((ret = s->avctx->get_buffer(s->avctx, &s->picture)) < 0) {
00325         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00326         return ret;
00327     }
00328     if (s->avctx->pix_fmt == PIX_FMT_PAL8) {
00329         if (s->palette_is_set) {
00330             memcpy(s->picture.data[1], s->palette, sizeof(s->palette));
00331         } else {
00332             /* make default grayscale pal */
00333             pal = (uint32_t *) s->picture.data[1];
00334             for (i = 0; i < 1<<s->bpp; i++)
00335                 pal[i] = 0xFF << 24 | i * 255 / ((1<<s->bpp) - 1) * 0x010101;
00336         }
00337     }
00338     return 0;
00339 }
00340 
00341 static int tiff_decode_tag(TiffContext *s, const uint8_t *start, const uint8_t *buf, const uint8_t *end_buf)
00342 {
00343     unsigned tag, type, count, off, value = 0;
00344     int i, j;
00345     uint32_t *pal;
00346     const uint8_t *rp, *gp, *bp;
00347 
00348     if (end_buf - buf < 12)
00349         return -1;
00350     tag = tget_short(&buf, s->le);
00351     type = tget_short(&buf, s->le);
00352     count = tget_long(&buf, s->le);
00353     off = tget_long(&buf, s->le);
00354 
00355     if (type == 0 || type >= FF_ARRAY_ELEMS(type_sizes)) {
00356         av_log(s->avctx, AV_LOG_DEBUG, "Unknown tiff type (%u) encountered\n", type);
00357         return 0;
00358     }
00359 
00360     if(count == 1){
00361         switch(type){
00362         case TIFF_BYTE:
00363         case TIFF_SHORT:
00364             buf -= 4;
00365             value = tget(&buf, type, s->le);
00366             buf = NULL;
00367             break;
00368         case TIFF_LONG:
00369             value = off;
00370             buf = NULL;
00371             break;
00372         case TIFF_STRING:
00373             if(count <= 4){
00374                 buf -= 4;
00375                 break;
00376             }
00377         default:
00378             value = UINT_MAX;
00379             buf = start + off;
00380         }
00381     } else {
00382         if (count <= 4 && type_sizes[type] * count <= 4) {
00383             buf -= 4;
00384         } else {
00385             buf = start + off;
00386         }
00387     }
00388 
00389     if(buf && (buf < start || buf > end_buf)){
00390         av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
00391         return -1;
00392     }
00393 
00394     switch(tag){
00395     case TIFF_WIDTH:
00396         s->width = value;
00397         break;
00398     case TIFF_HEIGHT:
00399         s->height = value;
00400         break;
00401     case TIFF_BPP:
00402         s->bppcount = count;
00403         if(count > 4){
00404             av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%d, %d components)\n", s->bpp, count);
00405             return -1;
00406         }
00407         if(count == 1) s->bpp = value;
00408         else{
00409             switch(type){
00410             case TIFF_BYTE:
00411                 s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) + ((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);
00412                 break;
00413             case TIFF_SHORT:
00414             case TIFF_LONG:
00415                 s->bpp = 0;
00416                 for(i = 0; i < count && buf < end_buf; i++) s->bpp += tget(&buf, type, s->le);
00417                 break;
00418             default:
00419                 s->bpp = -1;
00420             }
00421         }
00422         break;
00423     case TIFF_SAMPLES_PER_PIXEL:
00424         if (count != 1) {
00425             av_log(s->avctx, AV_LOG_ERROR,
00426                    "Samples per pixel requires a single value, many provided\n");
00427             return AVERROR_INVALIDDATA;
00428         }
00429         if (s->bppcount == 1)
00430             s->bpp *= value;
00431         s->bppcount = value;
00432         break;
00433     case TIFF_COMPR:
00434         s->compr = value;
00435         s->predictor = 0;
00436         switch(s->compr){
00437         case TIFF_RAW:
00438         case TIFF_PACKBITS:
00439         case TIFF_LZW:
00440         case TIFF_CCITT_RLE:
00441             break;
00442         case TIFF_G3:
00443         case TIFF_G4:
00444             s->fax_opts = 0;
00445             break;
00446         case TIFF_DEFLATE:
00447         case TIFF_ADOBE_DEFLATE:
00448 #if CONFIG_ZLIB
00449             break;
00450 #else
00451             av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
00452             return -1;
00453 #endif
00454         case TIFF_JPEG:
00455         case TIFF_NEWJPEG:
00456             av_log(s->avctx, AV_LOG_ERROR, "JPEG compression is not supported\n");
00457             return -1;
00458         default:
00459             av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n", s->compr);
00460             return -1;
00461         }
00462         break;
00463     case TIFF_ROWSPERSTRIP:
00464         if (type == TIFF_LONG && value == UINT_MAX)
00465             value = s->avctx->height;
00466         if(value < 1){
00467             av_log(s->avctx, AV_LOG_ERROR, "Incorrect value of rows per strip\n");
00468             return -1;
00469         }
00470         s->rps = value;
00471         break;
00472     case TIFF_STRIP_OFFS:
00473         if(count == 1){
00474             s->stripdata = NULL;
00475             s->stripoff = value;
00476         }else
00477             s->stripdata = start + off;
00478         s->strips = count;
00479         if(s->strips == 1) s->rps = s->height;
00480         s->sot = type;
00481         if(s->stripdata > end_buf){
00482             av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
00483             return -1;
00484         }
00485         break;
00486     case TIFF_STRIP_SIZE:
00487         if(count == 1){
00488             s->stripsizes = NULL;
00489             s->stripsize = value;
00490             s->strips = 1;
00491         }else{
00492             s->stripsizes = start + off;
00493         }
00494         s->strips = count;
00495         s->sstype = type;
00496         if(s->stripsizes > end_buf){
00497             av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
00498             return -1;
00499         }
00500         break;
00501     case TIFF_TILE_BYTE_COUNTS:
00502     case TIFF_TILE_LENGTH:
00503     case TIFF_TILE_OFFSETS:
00504     case TIFF_TILE_WIDTH:
00505         av_log(s->avctx, AV_LOG_ERROR, "Tiled images are not supported\n");
00506         return AVERROR_PATCHWELCOME;
00507         break;
00508     case TIFF_PREDICTOR:
00509         s->predictor = value;
00510         break;
00511     case TIFF_INVERT:
00512         switch(value){
00513         case 0:
00514             s->invert = 1;
00515             break;
00516         case 1:
00517             s->invert = 0;
00518             break;
00519         case 2:
00520         case 3:
00521             break;
00522         default:
00523             av_log(s->avctx, AV_LOG_ERROR, "Color mode %d is not supported\n", value);
00524             return -1;
00525         }
00526         break;
00527     case TIFF_FILL_ORDER:
00528         if(value < 1 || value > 2){
00529             av_log(s->avctx, AV_LOG_ERROR, "Unknown FillOrder value %d, trying default one\n", value);
00530             value = 1;
00531         }
00532         s->fill_order = value - 1;
00533         break;
00534     case TIFF_PAL:
00535         pal = (uint32_t *) s->palette;
00536         off = type_sizes[type];
00537         if (count / 3 > 256 || end_buf - buf < count / 3 * off * 3)
00538             return -1;
00539         rp = buf;
00540         gp = buf + count / 3 * off;
00541         bp = buf + count / 3 * off * 2;
00542         off = (type_sizes[type] - 1) << 3;
00543         for(i = 0; i < count / 3; i++){
00544             j = 0xff << 24;
00545             j |= (tget(&rp, type, s->le) >> off) << 16;
00546             j |= (tget(&gp, type, s->le) >> off) << 8;
00547             j |= tget(&bp, type, s->le) >> off;
00548             pal[i] = j;
00549         }
00550         s->palette_is_set = 1;
00551         break;
00552     case TIFF_PLANAR:
00553         if(value == 2){
00554             av_log(s->avctx, AV_LOG_ERROR, "Planar format is not supported\n");
00555             return -1;
00556         }
00557         break;
00558     case TIFF_T4OPTIONS:
00559         if(s->compr == TIFF_G3)
00560             s->fax_opts = value;
00561         break;
00562     case TIFF_T6OPTIONS:
00563         if(s->compr == TIFF_G4)
00564             s->fax_opts = value;
00565         break;
00566     default:
00567         av_log(s->avctx, AV_LOG_DEBUG, "Unknown or unsupported tag %d/0X%0X\n", tag, tag);
00568     }
00569     return 0;
00570 }
00571 
00572 static int decode_frame(AVCodecContext *avctx,
00573                         void *data, int *data_size,
00574                         AVPacket *avpkt)
00575 {
00576     const uint8_t *buf = avpkt->data;
00577     int buf_size = avpkt->size;
00578     TiffContext * const s = avctx->priv_data;
00579     AVFrame *picture = data;
00580     AVFrame * const p= (AVFrame*)&s->picture;
00581     const uint8_t *orig_buf = buf, *end_buf = buf + buf_size;
00582     unsigned off;
00583     int id, le, ret;
00584     int i, j, entries;
00585     int stride;
00586     unsigned soff, ssize;
00587     uint8_t *dst;
00588 
00589     //parse image header
00590     if (end_buf - buf < 8)
00591         return AVERROR_INVALIDDATA;
00592     id = AV_RL16(buf); buf += 2;
00593     if(id == 0x4949) le = 1;
00594     else if(id == 0x4D4D) le = 0;
00595     else{
00596         av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");
00597         return -1;
00598     }
00599     s->le = le;
00600     s->invert = 0;
00601     s->compr = TIFF_RAW;
00602     s->fill_order = 0;
00603     // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number
00604     // that further identifies the file as a TIFF file"
00605     if(tget_short(&buf, le) != 42){
00606         av_log(avctx, AV_LOG_ERROR, "The answer to life, universe and everything is not correct!\n");
00607         return -1;
00608     }
00609     // Reset these pointers so we can tell if they were set this frame
00610     s->stripsizes = s->stripdata = NULL;
00611     /* parse image file directory */
00612     off = tget_long(&buf, le);
00613     if (off >= UINT_MAX - 14 || end_buf - orig_buf < off + 14) {
00614         av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
00615         return AVERROR_INVALIDDATA;
00616     }
00617     buf = orig_buf + off;
00618     entries = tget_short(&buf, le);
00619     for(i = 0; i < entries; i++){
00620         if(tiff_decode_tag(s, orig_buf, buf, end_buf) < 0)
00621             return -1;
00622         buf += 12;
00623     }
00624     if(!s->stripdata && !s->stripoff){
00625         av_log(avctx, AV_LOG_ERROR, "Image data is missing\n");
00626         return -1;
00627     }
00628     /* now we have the data and may start decoding */
00629     if ((ret = init_image(s)) < 0)
00630         return ret;
00631 
00632     if(s->strips == 1 && !s->stripsize){
00633         av_log(avctx, AV_LOG_WARNING, "Image data size missing\n");
00634         s->stripsize = buf_size - s->stripoff;
00635     }
00636     stride = p->linesize[0];
00637     dst = p->data[0];
00638     for(i = 0; i < s->height; i += s->rps){
00639         if(s->stripsizes) {
00640             if (s->stripsizes >= end_buf)
00641                 return AVERROR_INVALIDDATA;
00642             ssize = tget(&s->stripsizes, s->sstype, s->le);
00643         } else
00644             ssize = s->stripsize;
00645 
00646         if(s->stripdata){
00647             if (s->stripdata >= end_buf)
00648                 return AVERROR_INVALIDDATA;
00649             soff = tget(&s->stripdata, s->sot, s->le);
00650         }else
00651             soff = s->stripoff;
00652 
00653         if (soff > buf_size || ssize > buf_size - soff) {
00654             av_log(avctx, AV_LOG_ERROR, "Invalid strip size/offset\n");
00655             return -1;
00656         }
00657         if(tiff_unpack_strip(s, dst, stride, orig_buf + soff, ssize, FFMIN(s->rps, s->height - i)) < 0)
00658             break;
00659         dst += s->rps * stride;
00660     }
00661     if(s->predictor == 2){
00662         dst = p->data[0];
00663         soff = s->bpp >> 3;
00664         ssize = s->width * soff;
00665         if (s->avctx->pix_fmt == PIX_FMT_RGB48LE ||
00666             s->avctx->pix_fmt == PIX_FMT_RGBA64LE) {
00667             for (i = 0; i < s->height; i++) {
00668                 for (j = soff; j < ssize; j += 2)
00669                     AV_WL16(dst + j, AV_RL16(dst + j) + AV_RL16(dst + j - soff));
00670                 dst += stride;
00671             }
00672         } else if (s->avctx->pix_fmt == PIX_FMT_RGB48BE ||
00673                    s->avctx->pix_fmt == PIX_FMT_RGBA64BE) {
00674             for (i = 0; i < s->height; i++) {
00675                 for (j = soff; j < ssize; j += 2)
00676                     AV_WB16(dst + j, AV_RB16(dst + j) + AV_RB16(dst + j - soff));
00677                 dst += stride;
00678             }
00679         } else {
00680             for(i = 0; i < s->height; i++) {
00681                 for(j = soff; j < ssize; j++)
00682                     dst[j] += dst[j - soff];
00683                 dst += stride;
00684             }
00685         }
00686     }
00687 
00688     if(s->invert){
00689         dst = s->picture.data[0];
00690         for(i = 0; i < s->height; i++){
00691             for(j = 0; j < s->picture.linesize[0]; j++)
00692                 dst[j] = (s->avctx->pix_fmt == PIX_FMT_PAL8 ? (1<<s->bpp) - 1 : 255) - dst[j];
00693             dst += s->picture.linesize[0];
00694         }
00695     }
00696     *picture= *(AVFrame*)&s->picture;
00697     *data_size = sizeof(AVPicture);
00698 
00699     return buf_size;
00700 }
00701 
00702 static av_cold int tiff_init(AVCodecContext *avctx){
00703     TiffContext *s = avctx->priv_data;
00704 
00705     s->width = 0;
00706     s->height = 0;
00707     s->avctx = avctx;
00708     avcodec_get_frame_defaults((AVFrame*)&s->picture);
00709     avctx->coded_frame= (AVFrame*)&s->picture;
00710     ff_lzw_decode_open(&s->lzw);
00711     ff_ccitt_unpack_init();
00712 
00713     return 0;
00714 }
00715 
00716 static av_cold int tiff_end(AVCodecContext *avctx)
00717 {
00718     TiffContext * const s = avctx->priv_data;
00719 
00720     ff_lzw_decode_close(&s->lzw);
00721     if(s->picture.data[0])
00722         avctx->release_buffer(avctx, &s->picture);
00723     return 0;
00724 }
00725 
00726 AVCodec ff_tiff_decoder = {
00727     .name           = "tiff",
00728     .type           = AVMEDIA_TYPE_VIDEO,
00729     .id             = CODEC_ID_TIFF,
00730     .priv_data_size = sizeof(TiffContext),
00731     .init           = tiff_init,
00732     .close          = tiff_end,
00733     .decode         = decode_frame,
00734     .capabilities   = CODEC_CAP_DR1,
00735     .long_name = NULL_IF_CONFIG_SMALL("TIFF image"),
00736 };
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