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FFmpeg/libavcodec/tiff.c

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  1. /*

  2.  * Copyright (c) 2006 Konstantin Shishkov

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  6.  * FFmpeg is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * FFmpeg is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with FFmpeg; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. /**

  22.  * @file

  23.  * TIFF image decoder

  24.  * @author Konstantin Shishkov

  25.  */

  26. 

  27. #include "avcodec.h"

  28. #if CONFIG_ZLIB

  29. #include <zlib.h>

  30. #endif

  31. #include "lzw.h"

  32. #include "tiff.h"

  33. #include "faxcompr.h"

  34. #include "libavutil/common.h"

  35. #include "libavutil/intreadwrite.h"

  36. #include "libavutil/imgutils.h"

  37. 

  38. typedef struct TiffContext {

  39.     AVCodecContext *avctx;

  40.     AVFrame picture;

  41. 

  42.     int width, height;

  43.     unsigned int bpp, bppcount;

  44.     uint32_t palette[256];

  45.     int palette_is_set;

  46.     int le;

  47.     enum TiffCompr compr;

  48.     int invert;

  49.     int fax_opts;

  50.     int predictor;

  51.     int fill_order;

  52. 

  53.     int strips, rps, sstype;

  54.     int sot;

  55.     const uint8_t* stripdata;

  56.     const uint8_t* stripsizes;

  57.     int stripsize, stripoff;

  58.     LZWState *lzw;

  59. } TiffContext;

  60. 

  61. static unsigned tget_short(const uint8_t **p, int le) {

  62.     unsigned v = le ? AV_RL16(*p) : AV_RB16(*p);

  63.     *p += 2;

  64.     return v;

  65. }

  66. 

  67. static unsigned tget_long(const uint8_t **p, int le) {

  68.     unsigned v = le ? AV_RL32(*p) : AV_RB32(*p);

  69.     *p += 4;

  70.     return v;

  71. }

  72. 

  73. static unsigned tget(const uint8_t **p, int type, int le) {

  74.     switch(type){

  75.     case TIFF_BYTE : return *(*p)++;

  76.     case TIFF_SHORT: return tget_short(p, le);

  77.     case TIFF_LONG : return tget_long (p, le);

  78.     default        : return UINT_MAX;

  79.     }

  80. }

  81. 

  82. #if CONFIG_ZLIB

  83. static int tiff_uncompress(uint8_t *dst, unsigned long *len, const uint8_t *src, int size)

  84. {

  85.     z_stream zstream;

  86.     int zret;

  87. 

  88.     memset(&zstream, 0, sizeof(zstream));

  89.     zstream.next_in = src;

  90.     zstream.avail_in = size;

  91.     zstream.next_out = dst;

  92.     zstream.avail_out = *len;

  93.     zret = inflateInit(&zstream);

  94.     if (zret != Z_OK) {

  95.         av_log(NULL, AV_LOG_ERROR, "Inflate init error: %d\n", zret);

  96.         return zret;

  97.     }

  98.     zret = inflate(&zstream, Z_SYNC_FLUSH);

  99.     inflateEnd(&zstream);

  100.     *len = zstream.total_out;

  101.     return zret == Z_STREAM_END ? Z_OK : zret;

  102. }

  103. #endif

  104. 

  105. static void av_always_inline horizontal_fill(unsigned int bpp, uint8_t* dst,

  106.                                              int usePtr, const uint8_t *src,

  107.                                              uint8_t c, int width, int offset)

  108. {

  109.     switch (bpp) {

  110.     case 1:

  111.         while (--width >= 0) {

  112.             dst[(width+offset)*8+7] = (usePtr ? src[width] : c)      & 0x1;

  113.             dst[(width+offset)*8+6] = (usePtr ? src[width] : c) >> 1 & 0x1;

  114.             dst[(width+offset)*8+5] = (usePtr ? src[width] : c) >> 2 & 0x1;

  115.             dst[(width+offset)*8+4] = (usePtr ? src[width] : c) >> 3 & 0x1;

  116.             dst[(width+offset)*8+3] = (usePtr ? src[width] : c) >> 4 & 0x1;

  117.             dst[(width+offset)*8+2] = (usePtr ? src[width] : c) >> 5 & 0x1;

  118.             dst[(width+offset)*8+1] = (usePtr ? src[width] : c) >> 6 & 0x1;

  119.             dst[(width+offset)*8+0] = (usePtr ? src[width] : c) >> 7;

  120.         }

  121.         break;

  122.     case 2:

  123.         while (--width >= 0) {

  124.             dst[(width+offset)*4+3] = (usePtr ? src[width] : c) & 0x3;

  125.             dst[(width+offset)*4+2] = (usePtr ? src[width] : c) >> 2 & 0x3;

  126.             dst[(width+offset)*4+1] = (usePtr ? src[width] : c) >> 4 & 0x3;

  127.             dst[(width+offset)*4+0] = (usePtr ? src[width] : c) >> 6;

  128.         }

  129.         break;

  130.     case 4:

  131.         while (--width >= 0) {

  132.             dst[(width+offset)*2+1] = (usePtr ? src[width] : c) & 0xF;

  133.             dst[(width+offset)*2+0] = (usePtr ? src[width] : c) >> 4;

  134.         }

  135.         break;

  136.     default:

  137.         if (usePtr) {

  138.             memcpy(dst + offset, src, width);

  139.         } else {

  140.             memset(dst + offset, c, width);

  141.         }

  142.     }

  143. }

  144. 

  145. static int tiff_unpack_strip(TiffContext *s, uint8_t* dst, int stride, const uint8_t *src, int size, int lines){

  146.     int c, line, pixels, code;

  147.     const uint8_t *ssrc = src;

  148.     int width = ((s->width * s->bpp) + 7) >> 3;

  149. #if CONFIG_ZLIB

  150.     uint8_t *zbuf; unsigned long outlen;

  151. 

  152.     if(s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE){

  153.         int ret;

  154.         outlen = width * lines;

  155.         zbuf = av_malloc(outlen);

  156.         ret = tiff_uncompress(zbuf, &outlen, src, size);

  157.         if(ret != Z_OK){

  158.             av_log(s->avctx, AV_LOG_ERROR, "Uncompressing failed (%lu of %lu) with error %d\n", outlen, (unsigned long)width * lines, ret);

  159.             av_free(zbuf);

  160.             return -1;

  161.         }

  162.         src = zbuf;

  163.         for(line = 0; line < lines; line++){

  164.             if(s->bpp < 8 && s->avctx->pix_fmt == PIX_FMT_PAL8){

  165.                 horizontal_fill(s->bpp, dst, 1, src, 0, width, 0);

  166.             }else{

  167.                 memcpy(dst, src, width);

  168.             }

  169.             dst += stride;

  170.             src += width;

  171.         }

  172.         av_free(zbuf);

  173.         return 0;

  174.     }

  175. #endif

  176.     if(s->compr == TIFF_LZW){

  177.         if(ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF) < 0){

  178.             av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");

  179.             return -1;

  180.         }

  181.     }

  182.     if(s->compr == TIFF_CCITT_RLE || s->compr == TIFF_G3 || s->compr == TIFF_G4){

  183.         int i, ret = 0;

  184.         uint8_t *src2 = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);

  185. 

  186.         if(!src2 || (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE < (unsigned)size){

  187.             av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");

  188.             return -1;

  189.         }

  190.         if(s->fax_opts & 2){

  191.             av_log(s->avctx, AV_LOG_ERROR, "Uncompressed fax mode is not supported (yet)\n");

  192.             av_free(src2);

  193.             return -1;

  194.         }

  195.         if(!s->fill_order){

  196.             memcpy(src2, src, size);

  197.         }else{

  198.             for(i = 0; i < size; i++)

  199.                 src2[i] = av_reverse[src[i]];

  200.         }

  201.         memset(src2+size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

  202.         switch(s->compr){

  203.         case TIFF_CCITT_RLE:

  204.         case TIFF_G3:

  205.         case TIFF_G4:

  206.             ret = ff_ccitt_unpack(s->avctx, src2, size, dst, lines, stride, s->compr, s->fax_opts);

  207.             break;

  208.         }

  209.         if (s->bpp < 8 && s->avctx->pix_fmt == PIX_FMT_PAL8)

  210.             for (line = 0; line < lines; line++) {

  211.                 horizontal_fill(s->bpp, dst, 1, dst, 0, width, 0);

  212.                 dst += stride;

  213.             }

  214.         av_free(src2);

  215.         return ret;

  216.     }

  217.     for(line = 0; line < lines; line++){

  218.         if(src - ssrc > size){

  219.             av_log(s->avctx, AV_LOG_ERROR, "Source data overread\n");

  220.             return -1;

  221.         }

  222.         switch(s->compr){

  223.         case TIFF_RAW:

  224.             if (ssrc + size - src < width)

  225.                 return AVERROR_INVALIDDATA;

  226.             if (!s->fill_order) {

  227.                 horizontal_fill(s->bpp * (s->avctx->pix_fmt == PIX_FMT_PAL8),

  228.                                 dst, 1, src, 0, width, 0);

  229.             } else {

  230.                 int i;

  231.                 for (i = 0; i < width; i++)

  232.                     dst[i] = av_reverse[src[i]];

  233.             }

  234.             src += width;

  235.             break;

  236.         case TIFF_PACKBITS:

  237.             for(pixels = 0; pixels < width;){

  238.                 code = (int8_t)*src++;

  239.                 if(code >= 0){

  240.                     code++;

  241.                     if(pixels + code > width){

  242.                         av_log(s->avctx, AV_LOG_ERROR, "Copy went out of bounds\n");

  243.                         return -1;

  244.                     }

  245.                     horizontal_fill(s->bpp * (s->avctx->pix_fmt == PIX_FMT_PAL8),

  246.                                     dst, 1, src, 0, code, pixels);

  247.                     src += code;

  248.                     pixels += code;

  249.                 }else if(code != -128){ // -127..-1

  250.                     code = (-code) + 1;

  251.                     if(pixels + code > width){

  252.                         av_log(s->avctx, AV_LOG_ERROR, "Run went out of bounds\n");

  253.                         return -1;

  254.                     }

  255.                     c = *src++;

  256.                     horizontal_fill(s->bpp * (s->avctx->pix_fmt == PIX_FMT_PAL8),

  257.                                     dst, 0, NULL, c, code, pixels);

  258.                     pixels += code;

  259.                 }

  260.             }

  261.             break;

  262.         case TIFF_LZW:

  263.             pixels = ff_lzw_decode(s->lzw, dst, width);

  264.             if(pixels < width){

  265.                 av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n", pixels, width);

  266.                 return -1;

  267.             }

  268.             if (s->bpp < 8 && s->avctx->pix_fmt == PIX_FMT_PAL8)

  269.                 horizontal_fill(s->bpp, dst, 1, dst, 0, width, 0);

  270.             break;

  271.         }

  272.         dst += stride;

  273.     }

  274.     return 0;

  275. }

  276. 

  277. static int init_image(TiffContext *s)

  278. {

  279.     int i, ret;

  280.     uint32_t *pal;

  281. 

  282.     switch (s->bpp * 10 + s->bppcount) {

  283.     case 11:

  284.         if (!s->palette_is_set) {

  285.             s->avctx->pix_fmt = PIX_FMT_MONOBLACK;

  286.             break;

  287.         }

  288.     case 21:

  289.     case 41:

  290.     case 81:

  291.         s->avctx->pix_fmt = PIX_FMT_PAL8;

  292.         break;

  293.     case 243:

  294.         s->avctx->pix_fmt = PIX_FMT_RGB24;

  295.         break;

  296.     case 161:

  297.         s->avctx->pix_fmt = PIX_FMT_GRAY16BE;

  298.         break;

  299.     case 162:

  300.         s->avctx->pix_fmt = PIX_FMT_GRAY8A;

  301.         break;

  302.     case 324:

  303.         s->avctx->pix_fmt = PIX_FMT_RGBA;

  304.         break;

  305.     case 483:

  306.         s->avctx->pix_fmt = s->le ? PIX_FMT_RGB48LE : PIX_FMT_RGB48BE;

  307.         break;

  308.     case 644:

  309.         s->avctx->pix_fmt = s->le ? PIX_FMT_RGBA64LE : PIX_FMT_RGBA64BE;

  310.         break;

  311.     default:

  312.         av_log(s->avctx, AV_LOG_ERROR,

  313.                "This format is not supported (bpp=%d, bppcount=%d)\n",

  314.                s->bpp, s->bppcount);

  315.         return AVERROR_INVALIDDATA;

  316.     }

  317.     if (s->width != s->avctx->width || s->height != s->avctx->height) {

  318.         if ((ret = av_image_check_size(s->width, s->height, 0, s->avctx)) < 0)

  319.             return ret;

  320.         avcodec_set_dimensions(s->avctx, s->width, s->height);

  321.     }

  322.     if (s->picture.data[0])

  323.         s->avctx->release_buffer(s->avctx, &s->picture);

  324.     if ((ret = s->avctx->get_buffer(s->avctx, &s->picture)) < 0) {

  325.         av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");

  326.         return ret;

  327.     }

  328.     if (s->avctx->pix_fmt == PIX_FMT_PAL8) {

  329.         if (s->palette_is_set) {

  330.             memcpy(s->picture.data[1], s->palette, sizeof(s->palette));

  331.         } else {

  332.             /* make default grayscale pal */

  333.             pal = (uint32_t *) s->picture.data[1];

  334.             for (i = 0; i < 1<<s->bpp; i++)

  335.                 pal[i] = 0xFF << 24 | i * 255 / ((1<<s->bpp) - 1) * 0x010101;

  336.         }

  337.     }

  338.     return 0;

  339. }

  340. 

  341. static int tiff_decode_tag(TiffContext *s, const uint8_t *start, const uint8_t *buf, const uint8_t *end_buf)

  342. {

  343.     unsigned tag, type, count, off, value = 0;

  344.     int i, j;

  345.     uint32_t *pal;

  346.     const uint8_t *rp, *gp, *bp;

  347. 

  348.     if (end_buf - buf < 12)

  349.         return -1;

  350.     tag = tget_short(&buf, s->le);

  351.     type = tget_short(&buf, s->le);

  352.     count = tget_long(&buf, s->le);

  353.     off = tget_long(&buf, s->le);

  354. 

  355.     if (type == 0 || type >= FF_ARRAY_ELEMS(type_sizes)) {

  356.         av_log(s->avctx, AV_LOG_DEBUG, "Unknown tiff type (%u) encountered\n", type);

  357.         return 0;

  358.     }

  359. 

  360.     if(count == 1){

  361.         switch(type){

  362.         case TIFF_BYTE:

  363.         case TIFF_SHORT:

  364.             buf -= 4;

  365.             value = tget(&buf, type, s->le);

  366.             buf = NULL;

  367.             break;

  368.         case TIFF_LONG:

  369.             value = off;

  370.             buf = NULL;

  371.             break;

  372.         case TIFF_STRING:

  373.             if(count <= 4){

  374.                 buf -= 4;

  375.                 break;

  376.             }

  377.         default:

  378.             value = UINT_MAX;

  379.             buf = start + off;

  380.         }

  381.     } else {

  382.         if (count <= 4 && type_sizes[type] * count <= 4) {

  383.             buf -= 4;

  384.         } else {

  385.             buf = start + off;

  386.         }

  387.     }

  388. 

  389.     if(buf && (buf < start || buf > end_buf)){

  390.         av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");

  391.         return -1;

  392.     }

  393. 

  394.     switch(tag){

  395.     case TIFF_WIDTH:

  396.         s->width = value;

  397.         break;

  398.     case TIFF_HEIGHT:

  399.         s->height = value;

  400.         break;

  401.     case TIFF_BPP:

  402.         s->bppcount = count;

  403.         if(count > 4){

  404.             av_log(s->avctx, AV_LOG_ERROR, "This format is not supported (bpp=%d, %d components)\n", s->bpp, count);

  405.             return -1;

  406.         }

  407.         if(count == 1) s->bpp = value;

  408.         else{

  409.             switch(type){

  410.             case TIFF_BYTE:

  411.                 s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) + ((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);

  412.                 break;

  413.             case TIFF_SHORT:

  414.             case TIFF_LONG:

  415.                 s->bpp = 0;

  416.                 for(i = 0; i < count && buf < end_buf; i++) s->bpp += tget(&buf, type, s->le);

  417.                 break;

  418.             default:

  419.                 s->bpp = -1;

  420.             }

  421.         }

  422.         break;

  423.     case TIFF_SAMPLES_PER_PIXEL:

  424.         if (count != 1) {

  425.             av_log(s->avctx, AV_LOG_ERROR,

  426.                    "Samples per pixel requires a single value, many provided\n");

  427.             return AVERROR_INVALIDDATA;

  428.         }

  429.         if (s->bppcount == 1)

  430.             s->bpp *= value;

  431.         s->bppcount = value;

  432.         break;

  433.     case TIFF_COMPR:

  434.         s->compr = value;

  435.         s->predictor = 0;

  436.         switch(s->compr){

  437.         case TIFF_RAW:

  438.         case TIFF_PACKBITS:

  439.         case TIFF_LZW:

  440.         case TIFF_CCITT_RLE:

  441.             break;

  442.         case TIFF_G3:

  443.         case TIFF_G4:

  444.             s->fax_opts = 0;

  445.             break;

  446.         case TIFF_DEFLATE:

  447.         case TIFF_ADOBE_DEFLATE:

  448. #if CONFIG_ZLIB

  449.             break;

  450. #else

  451.             av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");

  452.             return -1;

  453. #endif

  454.         case TIFF_JPEG:

  455.         case TIFF_NEWJPEG:

  456.             av_log(s->avctx, AV_LOG_ERROR, "JPEG compression is not supported\n");

  457.             return -1;

  458.         default:

  459.             av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n", s->compr);

  460.             return -1;

  461.         }

  462.         break;

  463.     case TIFF_ROWSPERSTRIP:

  464.         if (type == TIFF_LONG && value == UINT_MAX)

  465.             value = s->avctx->height;

  466.         if(value < 1){

  467.             av_log(s->avctx, AV_LOG_ERROR, "Incorrect value of rows per strip\n");

  468.             return -1;

  469.         }

  470.         s->rps = value;

  471.         break;

  472.     case TIFF_STRIP_OFFS:

  473.         if(count == 1){

  474.             s->stripdata = NULL;

  475.             s->stripoff = value;

  476.         }else

  477.             s->stripdata = start + off;

  478.         s->strips = count;

  479.         if(s->strips == 1) s->rps = s->height;

  480.         s->sot = type;

  481.         if(s->stripdata > end_buf){

  482.             av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");

  483.             return -1;

  484.         }

  485.         break;

  486.     case TIFF_STRIP_SIZE:

  487.         if(count == 1){

  488.             s->stripsizes = NULL;

  489.             s->stripsize = value;

  490.             s->strips = 1;

  491.         }else{

  492.             s->stripsizes = start + off;

  493.         }

  494.         s->strips = count;

  495.         s->sstype = type;

  496.         if(s->stripsizes > end_buf){

  497.             av_log(s->avctx, AV_LOG_ERROR, "Tag referencing position outside the image\n");

  498.             return -1;

  499.         }

  500.         break;

  501.     case TIFF_TILE_BYTE_COUNTS:

  502.     case TIFF_TILE_LENGTH:

  503.     case TIFF_TILE_OFFSETS:

  504.     case TIFF_TILE_WIDTH:

  505.         av_log(s->avctx, AV_LOG_ERROR, "Tiled images are not supported\n");

  506.         return AVERROR_PATCHWELCOME;

  507.         break;

  508.     case TIFF_PREDICTOR:

  509.         s->predictor = value;

  510.         break;

  511.     case TIFF_INVERT:

  512.         switch(value){

  513.         case 0:

  514.             s->invert = 1;

  515.             break;

  516.         case 1:

  517.             s->invert = 0;

  518.             break;

  519.         case 2:

  520.         case 3:

  521.             break;

  522.         default:

  523.             av_log(s->avctx, AV_LOG_ERROR, "Color mode %d is not supported\n", value);

  524.             return -1;

  525.         }

  526.         break;

  527.     case TIFF_FILL_ORDER:

  528.         if(value < 1 || value > 2){

  529.             av_log(s->avctx, AV_LOG_ERROR, "Unknown FillOrder value %d, trying default one\n", value);

  530.             value = 1;

  531.         }

  532.         s->fill_order = value - 1;

  533.         break;

  534.     case TIFF_PAL:

  535.         pal = (uint32_t *) s->palette;

  536.         off = type_sizes[type];

  537.         if (count / 3 > 256 || end_buf - buf < count / 3 * off * 3)

  538.             return -1;

  539.         rp = buf;

  540.         gp = buf + count / 3 * off;

  541.         bp = buf + count / 3 * off * 2;

  542.         off = (type_sizes[type] - 1) << 3;

  543.         for(i = 0; i < count / 3; i++){

  544.             j = 0xff << 24;

  545.             j |= (tget(&rp, type, s->le) >> off) << 16;

  546.             j |= (tget(&gp, type, s->le) >> off) << 8;

  547.             j |= tget(&bp, type, s->le) >> off;

  548.             pal[i] = j;

  549.         }

  550.         s->palette_is_set = 1;

  551.         break;

  552.     case TIFF_PLANAR:

  553.         if(value == 2){

  554.             av_log(s->avctx, AV_LOG_ERROR, "Planar format is not supported\n");

  555.             return -1;

  556.         }

  557.         break;

  558.     case TIFF_T4OPTIONS:

  559.         if(s->compr == TIFF_G3)

  560.             s->fax_opts = value;

  561.         break;

  562.     case TIFF_T6OPTIONS:

  563.         if(s->compr == TIFF_G4)

  564.             s->fax_opts = value;

  565.         break;

  566.     default:

  567.         av_log(s->avctx, AV_LOG_DEBUG, "Unknown or unsupported tag %d/0X%0X\n", tag, tag);

  568.     }

  569.     return 0;

  570. }

  571. 

  572. static int decode_frame(AVCodecContext *avctx,

  573.                         void *data, int *data_size,

  574.                         AVPacket *avpkt)

  575. {

  576.     const uint8_t *buf = avpkt->data;

  577.     int buf_size = avpkt->size;

  578.     TiffContext * const s = avctx->priv_data;

  579.     AVFrame *picture = data;

  580.     AVFrame * const p = &s->picture;

  581.     const uint8_t *orig_buf = buf, *end_buf = buf + buf_size;

  582.     unsigned off;

  583.     int id, le, ret;

  584.     int i, j, entries;

  585.     int stride;

  586.     unsigned soff, ssize;

  587.     uint8_t *dst;

  588. 

  589.     //parse image header

  590.     if (end_buf - buf < 8)

  591.         return AVERROR_INVALIDDATA;

  592.     id = AV_RL16(buf); buf += 2;

  593.     if(id == 0x4949) le = 1;

  594.     else if(id == 0x4D4D) le = 0;

  595.     else{

  596.         av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");

  597.         return -1;

  598.     }

  599.     s->le = le;

  600.     s->invert = 0;

  601.     s->compr = TIFF_RAW;

  602.     s->fill_order = 0;

  603.     // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number

  604.     // that further identifies the file as a TIFF file"

  605.     if(tget_short(&buf, le) != 42){

  606.         av_log(avctx, AV_LOG_ERROR, "The answer to life, universe and everything is not correct!\n");

  607.         return -1;

  608.     }

  609.     // Reset these pointers so we can tell if they were set this frame

  610.     s->stripsizes = s->stripdata = NULL;

  611.     /* parse image file directory */

  612.     off = tget_long(&buf, le);

  613.     if (off >= UINT_MAX - 14 || end_buf - orig_buf < off + 14) {

  614.         av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");

  615.         return AVERROR_INVALIDDATA;

  616.     }

  617.     buf = orig_buf + off;

  618.     entries = tget_short(&buf, le);

  619.     for(i = 0; i < entries; i++){

  620.         if(tiff_decode_tag(s, orig_buf, buf, end_buf) < 0)

  621.             return -1;

  622.         buf += 12;

  623.     }

  624.     if(!s->stripdata && !s->stripoff){

  625.         av_log(avctx, AV_LOG_ERROR, "Image data is missing\n");

  626.         return -1;

  627.     }

  628.     /* now we have the data and may start decoding */

  629.     if ((ret = init_image(s)) < 0)

  630.         return ret;

  631. 

  632.     if(s->strips == 1 && !s->stripsize){

  633.         av_log(avctx, AV_LOG_WARNING, "Image data size missing\n");

  634.         s->stripsize = buf_size - s->stripoff;

  635.     }

  636.     stride = p->linesize[0];

  637.     dst = p->data[0];

  638.     for(i = 0; i < s->height; i += s->rps){

  639.         if(s->stripsizes) {

  640.             if (s->stripsizes >= end_buf)

  641.                 return AVERROR_INVALIDDATA;

  642.             ssize = tget(&s->stripsizes, s->sstype, s->le);

  643.         } else

  644.             ssize = s->stripsize;

  645. 

  646.         if(s->stripdata){

  647.             if (s->stripdata >= end_buf)

  648.                 return AVERROR_INVALIDDATA;

  649.             soff = tget(&s->stripdata, s->sot, s->le);

  650.         }else

  651.             soff = s->stripoff;

  652. 

  653.         if (soff > buf_size || ssize > buf_size - soff) {

  654.             av_log(avctx, AV_LOG_ERROR, "Invalid strip size/offset\n");

  655.             return -1;

  656.         }

  657.         if(tiff_unpack_strip(s, dst, stride, orig_buf + soff, ssize, FFMIN(s->rps, s->height - i)) < 0)

  658.             break;

  659.         dst += s->rps * stride;

  660.     }

  661.     if(s->predictor == 2){

  662.         dst = p->data[0];

  663.         soff = s->bpp >> 3;

  664.         ssize = s->width * soff;

  665.         if (s->avctx->pix_fmt == PIX_FMT_RGB48LE ||

  666.             s->avctx->pix_fmt == PIX_FMT_RGBA64LE) {

  667.             for (i = 0; i < s->height; i++) {

  668.                 for (j = soff; j < ssize; j += 2)

  669.                     AV_WL16(dst + j, AV_RL16(dst + j) + AV_RL16(dst + j - soff));

  670.                 dst += stride;

  671.             }

  672.         } else if (s->avctx->pix_fmt == PIX_FMT_RGB48BE ||

  673.                    s->avctx->pix_fmt == PIX_FMT_RGBA64BE) {

  674.             for (i = 0; i < s->height; i++) {

  675.                 for (j = soff; j < ssize; j += 2)

  676.                     AV_WB16(dst + j, AV_RB16(dst + j) + AV_RB16(dst + j - soff));

  677.                 dst += stride;

  678.             }

  679.         } else {

  680.             for(i = 0; i < s->height; i++) {

  681.                 for(j = soff; j < ssize; j++)

  682.                     dst[j] += dst[j - soff];

  683.                 dst += stride;

  684.             }

  685.         }

  686.     }

  687. 

  688.     if(s->invert){

  689.         dst = s->picture.data[0];

  690.         for(i = 0; i < s->height; i++){

  691.             for(j = 0; j < s->picture.linesize[0]; j++)

  692.                 dst[j] = (s->avctx->pix_fmt == PIX_FMT_PAL8 ? (1<<s->bpp) - 1 : 255) - dst[j];

  693.             dst += s->picture.linesize[0];

  694.         }

  695.     }

  696.     *picture   = s->picture;

  697.     *data_size = sizeof(AVPicture);

  698. 

  699.     return buf_size;

  700. }

  701. 

  702. static av_cold int tiff_init(AVCodecContext *avctx){

  703.     TiffContext *s = avctx->priv_data;

  704. 

  705.     s->width = 0;

  706.     s->height = 0;

  707.     s->avctx = avctx;

  708.     avcodec_get_frame_defaults(&s->picture);

  709.     avctx->coded_frame = &s->picture;

  710.     ff_lzw_decode_open(&s->lzw);

  711.     ff_ccitt_unpack_init();

  712. 

  713.     return 0;

  714. }

  715. 

  716. static av_cold int tiff_end(AVCodecContext *avctx)

  717. {

  718.     TiffContext * const s = avctx->priv_data;

  719. 

  720.     ff_lzw_decode_close(&s->lzw);

  721.     if(s->picture.data[0])

  722.         avctx->release_buffer(avctx, &s->picture);

  723.     return 0;

  724. }

  725. 

  726. AVCodec ff_tiff_decoder = {

  727.     .name           = "tiff",

  728.     .type           = AVMEDIA_TYPE_VIDEO,

  729.     .id             = CODEC_ID_TIFF,

  730.     .priv_data_size = sizeof(TiffContext),

  731.     .init           = tiff_init,

  732.     .close          = tiff_end,

  733.     .decode         = decode_frame,

  734.     .capabilities   = CODEC_CAP_DR1,

  735.     .long_name = NULL_IF_CONFIG_SMALL("TIFF image"),

  736. };