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libavcodec/tiff.c

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00001 /*
00002  * TIFF image decoder
00003  * Copyright (c) 2006 Konstantin Shishkov
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
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 
00035 
00036 typedef struct TiffContext {
00037     AVCodecContext *avctx;
00038     AVFrame picture;
00039 
00040     int width, height;
00041     unsigned int bpp;
00042     int le;
00043     int compr;
00044     int invert;
00045     int fax_opts;
00046     int predictor;
00047 
00048     int strips, rps, sstype;
00049     int sot;
00050     const uint8_t* stripdata;
00051     const uint8_t* stripsizes;
00052     int stripsize, stripoff;
00053     LZWState *lzw;
00054 } TiffContext;
00055 
00056 static int tget_short(const uint8_t **p, int le){
00057     int v = le ? AV_RL16(*p) : AV_RB16(*p);
00058     *p += 2;
00059     return v;
00060 }
00061 
00062 static int tget_long(const uint8_t **p, int le){
00063     int v = le ? AV_RL32(*p) : AV_RB32(*p);
00064     *p += 4;
00065     return v;
00066 }
00067 
00068 static int tget(const uint8_t **p, int type, int le){
00069     switch(type){
00070     case TIFF_BYTE : return *(*p)++;
00071     case TIFF_SHORT: return tget_short(p, le);
00072     case TIFF_LONG : return tget_long (p, le);
00073     default        : return -1;
00074     }
00075 }
00076 
00077 static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uint8_t *src, int size, int lines){
00078     int c, line, pixels, code;
00079     const uint8_t *ssrc = src;
00080     int width = s->width * s->bpp >> 3;
00081 #if CONFIG_ZLIB
00082     uint8_t *zbuf; unsigned long outlen;
00083 
00084     if(s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE){
00085         outlen = width * lines;
00086         zbuf = av_malloc(outlen);
00087         if(uncompress(zbuf, &outlen, src, size) != Z_OK){
00088             av_log(s->avctx, AV_LOG_ERROR, "Uncompressing failed (%lu of %lu)\n", outlen, (unsigned long)width * lines);
00089             av_free(zbuf);
00090             return -1;
00091         }
00092         src = zbuf;
00093         for(line = 0; line < lines; line++){
00094             memcpy(dst, src, width);
00095             dst += stride;
00096             src += width;
00097         }
00098         av_free(zbuf);
00099         return 0;
00100     }
00101 #endif
00102     if(s->compr == TIFF_LZW){
00103         if(ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF) < 0){
00104             av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
00105             return -1;
00106         }
00107     }
00108     if(s->compr == TIFF_CCITT_RLE || s->compr == TIFF_G3 || s->compr == TIFF_G4){
00109         int i, ret = 0;
00110         uint8_t *src2 = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
00111 
00112         if(!src2 || (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE < (unsigned)size){
00113             av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");
00114             return -1;
00115         }
00116         for(i = 0; i < size; i++)
00117             src2[i] = ff_reverse[src[i]];
00118         memset(src2+size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
00119         if(s->compr == TIFF_G3 && !(s->fax_opts & 1))
00120             s->compr = TIFF_CCITT_RLE;
00121         switch(s->compr){
00122         case TIFF_CCITT_RLE:
00123         case TIFF_G3:
00124         case TIFF_G4:
00125             ret = ff_ccitt_unpack(s->avctx, src2, size, dst, lines, stride, s->compr);
00126             break;
00127         }
00128         av_free(src2);
00129         return ret;
00130     }
00131     for(line = 0; line < lines; line++){
00132         if(src - ssrc > size){
00133             av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");
00134             return -1;
00135         }
00136         switch(s->compr){
00137         case TIFF_RAW:
00138             memcpy(dst, src, width);
00139             src += width;
00140             break;
00141         case TIFF_PACKBITS:
00142             for(pixels = 0; pixels < width;){
00143                 code = (int8_t)*src++;
00144                 if(code >= 0){
00145                     code++;
00146                     if(pixels + code > width){
00147                         av_log(s->avctx, AV_LOG_ERROR, "Copy went out of bounds\n");
00148                         return -1;
00149                     }
00150                     memcpy(dst + pixels, src, code);
00151                     src += code;
00152                     pixels += code;
00153                 }else if(code != -128){ // -127..-1
00154                     code = (-code) + 1;
00155                     if(pixels + code > width){
00156                         av_log(s->avctx, AV_LOG_ERROR, "Run went out of bounds\n");
00157                         return -1;
00158                     }
00159                     c = *src++;
00160                     memset(dst + pixels, c, code);
00161                     pixels += code;
00162                 }
00163             }
00164             break;
00165         case TIFF_LZW:
00166             pixels = ff_lzw_decode(s->lzw, dst, width);
00167             if(pixels < width){
00168                 av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n", pixels, width);
00169                 return -1;
00170             }
00171             break;
00172         }
00173         dst += stride;
00174     }
00175     return 0;
00176 }
00177 
00178 
00179 static int tiff_decode_tag(TiffContext *s, const uint8_t *start, const uint8_t *buf, const uint8_t *end_buf)
00180 {
00181     int tag, type, count, off, value = 0;
00182     int i, j;
00183     uint32_t *pal;
00184     const uint8_t *rp, *gp, *bp;
00185 
00186     tag = tget_short(&buf, s->le);
00187     type = tget_short(&buf, s->le);
00188     count = tget_long(&buf, s->le);
00189     off = tget_long(&buf, s->le);
00190 
00191     if(count == 1){
00192         switch(type){
00193         case TIFF_BYTE:
00194         case TIFF_SHORT:
00195             buf -= 4;
00196             value = tget(&buf, type, s->le);
00197             buf = NULL;
00198             break;
00199         case TIFF_LONG:
00200             value = off;
00201             buf = NULL;
00202             break;
00203         case TIFF_STRING:
00204             if(count <= 4){
00205                 buf -= 4;
00206                 break;
00207             }
00208         default:
00209             value = -1;
00210             buf = start + off;
00211         }
00212     }else if(type_sizes[type] * count <= 4){
00213         buf -= 4;
00214     }else{
00215         buf = start + off;
00216     }
00217 
00218     if(buf && (buf < start || buf > end_buf)){
00219         av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
00220         return -1;
00221     }
00222 
00223     switch(tag){
00224     case TIFF_WIDTH:
00225         s->width = value;
00226         break;
00227     case TIFF_HEIGHT:
00228         s->height = value;
00229         break;
00230     case TIFF_BPP:
00231         if(count == 1) s->bpp = value;
00232         else{
00233             switch(type){
00234             case TIFF_BYTE:
00235                 s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) + ((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);
00236                 break;
00237             case TIFF_SHORT:
00238             case TIFF_LONG:
00239                 s->bpp = 0;
00240                 for(i = 0; i < count; i++) s->bpp += tget(&buf, type, s->le);
00241                 break;
00242             default:
00243                 s->bpp = -1;
00244             }
00245         }
00246         switch(s->bpp){
00247         case 1:
00248             s->avctx->pix_fmt = PIX_FMT_MONOBLACK;
00249             break;
00250         case 8:
00251             s->avctx->pix_fmt = PIX_FMT_PAL8;
00252             break;
00253         case 24:
00254             s->avctx->pix_fmt = PIX_FMT_RGB24;
00255             break;
00256         case 16:
00257             if(count == 1){
00258                 s->avctx->pix_fmt = PIX_FMT_GRAY16BE;
00259             }else{
00260                 av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%i)\n", s->bpp);
00261                 return -1;
00262             }
00263             break;
00264         default:
00265             av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%i)\n", s->bpp);
00266             return -1;
00267         }
00268         if(s->width != s->avctx->width || s->height != s->avctx->height){
00269             if(avcodec_check_dimensions(s->avctx, s->width, s->height))
00270                 return -1;
00271             avcodec_set_dimensions(s->avctx, s->width, s->height);
00272         }
00273         if(s->picture.data[0])
00274             s->avctx->release_buffer(s->avctx, &s->picture);
00275         if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
00276             av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00277             return -1;
00278         }
00279         if(s->bpp == 8){
00280             /* make default grayscale pal */
00281             pal = (uint32_t *) s->picture.data[1];
00282             for(i = 0; i < 256; i++)
00283                 pal[i] = i * 0x010101;
00284         }
00285         break;
00286     case TIFF_COMPR:
00287         s->compr = value;
00288         s->predictor = 0;
00289         switch(s->compr){
00290         case TIFF_RAW:
00291         case TIFF_PACKBITS:
00292         case TIFF_LZW:
00293         case TIFF_CCITT_RLE:
00294             break;
00295         case TIFF_G3:
00296         case TIFF_G4:
00297             s->fax_opts = 0;
00298             break;
00299         case TIFF_DEFLATE:
00300         case TIFF_ADOBE_DEFLATE:
00301 #if CONFIG_ZLIB
00302             break;
00303 #else
00304             av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
00305             return -1;
00306 #endif
00307         case TIFF_JPEG:
00308         case TIFF_NEWJPEG:
00309             av_log(s->avctx, AV_LOG_ERROR, "JPEG compression is not supported\n");
00310             return -1;
00311         default:
00312             av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n", s->compr);
00313             return -1;
00314         }
00315         break;
00316     case TIFF_ROWSPERSTRIP:
00317         if(type == TIFF_LONG && value == -1)
00318             value = s->avctx->height;
00319         if(value < 1){
00320             av_log(s->avctx, AV_LOG_ERROR, "Incorrect value of rows per strip\n");
00321             return -1;
00322         }
00323         s->rps = value;
00324         break;
00325     case TIFF_STRIP_OFFS:
00326         if(count == 1){
00327             s->stripdata = NULL;
00328             s->stripoff = value;
00329         }else
00330             s->stripdata = start + off;
00331         s->strips = count;
00332         if(s->strips == 1) s->rps = s->height;
00333         s->sot = type;
00334         if(s->stripdata > end_buf){
00335             av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
00336             return -1;
00337         }
00338         break;
00339     case TIFF_STRIP_SIZE:
00340         if(count == 1){
00341             s->stripsizes = NULL;
00342             s->stripsize = value;
00343             s->strips = 1;
00344         }else{
00345             s->stripsizes = start + off;
00346         }
00347         s->strips = count;
00348         s->sstype = type;
00349         if(s->stripsizes > end_buf){
00350             av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");
00351             return -1;
00352         }
00353         break;
00354     case TIFF_PREDICTOR:
00355         s->predictor = value;
00356         break;
00357     case TIFF_INVERT:
00358         switch(value){
00359         case 0:
00360             s->invert = 1;
00361             break;
00362         case 1:
00363             s->invert = 0;
00364             break;
00365         case 2:
00366         case 3:
00367             break;
00368         default:
00369             av_log(s->avctx, AV_LOG_ERROR, "Color mode %d is not supported\n", value);
00370             return -1;
00371         }
00372         break;
00373     case TIFF_PAL:
00374         if(s->avctx->pix_fmt != PIX_FMT_PAL8){
00375             av_log(s->avctx, AV_LOG_ERROR, "Palette met but this is not palettized format\n");
00376             return -1;
00377         }
00378         pal = (uint32_t *) s->picture.data[1];
00379         off = type_sizes[type];
00380         rp = buf;
00381         gp = buf + count / 3 * off;
00382         bp = buf + count / 3 * off * 2;
00383         off = (type_sizes[type] - 1) << 3;
00384         for(i = 0; i < count / 3; i++){
00385             j = (tget(&rp, type, s->le) >> off) << 16;
00386             j |= (tget(&gp, type, s->le) >> off) << 8;
00387             j |= tget(&bp, type, s->le) >> off;
00388             pal[i] = j;
00389         }
00390         break;
00391     case TIFF_PLANAR:
00392         if(value == 2){
00393             av_log(s->avctx, AV_LOG_ERROR, "Planar format is not supported\n");
00394             return -1;
00395         }
00396         break;
00397     case TIFF_T4OPTIONS:
00398     case TIFF_T6OPTIONS:
00399         s->fax_opts = value;
00400         break;
00401     }
00402     return 0;
00403 }
00404 
00405 static int decode_frame(AVCodecContext *avctx,
00406                         void *data, int *data_size,
00407                         const uint8_t *buf, int buf_size)
00408 {
00409     TiffContext * const s = avctx->priv_data;
00410     AVFrame *picture = data;
00411     AVFrame * const p= (AVFrame*)&s->picture;
00412     const uint8_t *orig_buf = buf, *end_buf = buf + buf_size;
00413     int id, le, off;
00414     int i, j, entries;
00415     int stride, soff, ssize;
00416     uint8_t *dst;
00417 
00418     //parse image header
00419     id = AV_RL16(buf); buf += 2;
00420     if(id == 0x4949) le = 1;
00421     else if(id == 0x4D4D) le = 0;
00422     else{
00423         av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");
00424         return -1;
00425     }
00426     s->le = le;
00427     s->invert = 0;
00428     s->compr = TIFF_RAW;
00429     // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number
00430     // that further identifies the file as a TIFF file"
00431     if(tget_short(&buf, le) != 42){
00432         av_log(avctx, AV_LOG_ERROR, "The answer to life, universe and everything is not correct!\n");
00433         return -1;
00434     }
00435     /* parse image file directory */
00436     off = tget_long(&buf, le);
00437     if(orig_buf + off + 14 >= end_buf){
00438         av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
00439         return -1;
00440     }
00441     buf = orig_buf + off;
00442     entries = tget_short(&buf, le);
00443     for(i = 0; i < entries; i++){
00444         if(tiff_decode_tag(s, orig_buf, buf, end_buf) < 0)
00445             return -1;
00446         buf += 12;
00447     }
00448     if(!s->stripdata && !s->stripoff){
00449         av_log(avctx, AV_LOG_ERROR, "Image data is missing\n");
00450         return -1;
00451     }
00452     /* now we have the data and may start decoding */
00453     if(!p->data[0]){
00454         av_log(s->avctx, AV_LOG_ERROR, "Picture initialization missing\n");
00455         return -1;
00456     }
00457     if(s->strips == 1 && !s->stripsize){
00458         av_log(avctx, AV_LOG_WARNING, "Image data size missing\n");
00459         s->stripsize = buf_size - s->stripoff;
00460     }
00461     stride = p->linesize[0];
00462     dst = p->data[0];
00463     for(i = 0; i < s->height; i += s->rps){
00464         if(s->stripsizes)
00465             ssize = tget(&s->stripsizes, s->sstype, s->le);
00466         else
00467             ssize = s->stripsize;
00468 
00469         if(s->stripdata){
00470             soff = tget(&s->stripdata, s->sot, s->le);
00471         }else
00472             soff = s->stripoff;
00473         if(tiff_unpack_strip(s, dst, stride, orig_buf + soff, ssize, FFMIN(s->rps, s->height - i)) < 0)
00474             break;
00475         dst += s->rps * stride;
00476     }
00477     if(s->predictor == 2){
00478         dst = p->data[0];
00479         soff = s->bpp >> 3;
00480         ssize = s->width * soff;
00481         for(i = 0; i < s->height; i++) {
00482             for(j = soff; j < ssize; j++)
00483                 dst[j] += dst[j - soff];
00484             dst += stride;
00485         }
00486     }
00487 
00488     if(s->invert){
00489         uint8_t *src;
00490         int j;
00491 
00492         src = s->picture.data[0];
00493         for(j = 0; j < s->height; j++){
00494             for(i = 0; i < s->picture.linesize[0]; i++)
00495                 src[i] = 255 - src[i];
00496             src += s->picture.linesize[0];
00497         }
00498     }
00499     *picture= *(AVFrame*)&s->picture;
00500     *data_size = sizeof(AVPicture);
00501 
00502     return buf_size;
00503 }
00504 
00505 static av_cold int tiff_init(AVCodecContext *avctx){
00506     TiffContext *s = avctx->priv_data;
00507 
00508     s->width = 0;
00509     s->height = 0;
00510     s->avctx = avctx;
00511     avcodec_get_frame_defaults((AVFrame*)&s->picture);
00512     avctx->coded_frame= (AVFrame*)&s->picture;
00513     s->picture.data[0] = NULL;
00514     ff_lzw_decode_open(&s->lzw);
00515     ff_ccitt_unpack_init();
00516 
00517     return 0;
00518 }
00519 
00520 static av_cold int tiff_end(AVCodecContext *avctx)
00521 {
00522     TiffContext * const s = avctx->priv_data;
00523 
00524     ff_lzw_decode_close(&s->lzw);
00525     if(s->picture.data[0])
00526         avctx->release_buffer(avctx, &s->picture);
00527     return 0;
00528 }
00529 
00530 AVCodec tiff_decoder = {
00531     "tiff",
00532     CODEC_TYPE_VIDEO,
00533     CODEC_ID_TIFF,
00534     sizeof(TiffContext),
00535     tiff_init,
00536     NULL,
00537     tiff_end,
00538     decode_frame,
00539     0,
00540     NULL,
00541     .long_name = NULL_IF_CONFIG_SMALL("TIFF image"),
00542 };

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