falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
39577 Commits
32 Branches
434MB
Tree: b717f35bfb
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'b717f35bfb'
${ noResults }
FFmpeg/libavcodec/tiff.c

736 lines
23KB
Raw Blame History 

  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 = { 0 };

  86.     int zret;

  87. 

  88.     zstream.next_in = src;

  89.     zstream.avail_in = size;

  90.     zstream.next_out = dst;

  91.     zstream.avail_out = *len;

  92.     zret = inflateInit(&zstream);

  93.     if (zret != Z_OK) {

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

  95.         return zret;

  96.     }

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

  98.     inflateEnd(&zstream);

  99.     *len = zstream.total_out;

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

  101. }

  102. #endif

  103. 

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

  105.                                              int usePtr, const uint8_t *src,

  106.                                              uint8_t c, int width, int offset)

  107. {

  108.     switch (bpp) {

  109.     case 1:

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

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

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

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

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

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

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

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

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

  119.         }

  120.         break;

  121.     case 2:

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

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

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

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

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

  127.         }

  128.         break;

  129.     case 4:

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

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

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

  133.         }

  134.         break;

  135.     default:

  136.         if (usePtr) {

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

  138.         } else {

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

  140.         }

  141.     }

  142. }

  143. 

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

  145.     int c, line, pixels, code;

  146.     const uint8_t *ssrc = src;

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

  148. #if CONFIG_ZLIB

  149.     uint8_t *zbuf; unsigned long outlen;

  150. 

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

  152.         int ret;

  153.         outlen = width * lines;

  154.         zbuf = av_malloc(outlen);

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

  156.         if(ret != Z_OK){

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

  158.             av_free(zbuf);

  159.             return -1;

  160.         }

  161.         src = zbuf;

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

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

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

  165.             }else{

  166.                 memcpy(dst, src, width);

  167.             }

  168.             dst += stride;

  169.             src += width;

  170.         }

  171.         av_free(zbuf);

  172.         return 0;

  173.     }

  174. #endif

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

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

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

  178.             return -1;

  179.         }

  180.     }

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

  182.         int i, ret = 0;

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

  184. 

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

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

  187.             return -1;

  188.         }

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

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

  191.             av_free(src2);

  192.             return -1;

  193.         }

  194.         if(!s->fill_order){

  195.             memcpy(src2, src, size);

  196.         }else{

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

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

  199.         }

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

  201.         switch(s->compr){

  202.         case TIFF_CCITT_RLE:

  203.         case TIFF_G3:

  204.         case TIFF_G4:

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

  206.             break;

  207.         }

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

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

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

  211.                 dst += stride;

  212.             }

  213.         av_free(src2);

  214.         return ret;

  215.     }

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

  217.         if(src - ssrc > size){

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

  219.             return -1;

  220.         }

  221.         switch(s->compr){

  222.         case TIFF_RAW:

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

  224.                 return AVERROR_INVALIDDATA;

  225.             if (!s->fill_order) {

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

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

  228.             } else {

  229.                 int i;

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

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

  232.             }

  233.             src += width;

  234.             break;

  235.         case TIFF_PACKBITS:

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

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

  238.                 if(code >= 0){

  239.                     code++;

  240.                     if(pixels + code > width){

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

  242.                         return -1;

  243.                     }

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

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

  246.                     src += code;

  247.                     pixels += code;

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

  249.                     code = (-code) + 1;

  250.                     if(pixels + code > width){

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

  252.                         return -1;

  253.                     }

  254.                     c = *src++;

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

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

  257.                     pixels += code;

  258.                 }

  259.             }

  260.             break;

  261.         case TIFF_LZW:

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

  263.             if(pixels < width){

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

  265.                 return -1;

  266.             }

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

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

  269.             break;

  270.         }

  271.         dst += stride;

  272.     }

  273.     return 0;

  274. }

  275. 

  276. static int init_image(TiffContext *s)

  277. {

  278.     int i, ret;

  279.     uint32_t *pal;

  280. 

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

  282.     case 11:

  283.         if (!s->palette_is_set) {

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

  285.             break;

  286.         }

  287.     case 21:

  288.     case 41:

  289.     case 81:

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

  291.         break;

  292.     case 243:

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

  294.         break;

  295.     case 161:

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

  297.         break;

  298.     case 162:

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

  300.         break;

  301.     case 324:

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

  303.         break;

  304.     case 483:

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

  306.         break;

  307.     case 644:

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

  309.         break;

  310.     default:

  311.         av_log(s->avctx, AV_LOG_ERROR,

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

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

  314.         return AVERROR_INVALIDDATA;

  315.     }

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

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

  318.             return ret;

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

  320.     }

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

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

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

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

  325.         return ret;

  326.     }

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

  328.         if (s->palette_is_set) {

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

  330.         } else {

  331.             /* make default grayscale pal */

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

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

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

  335.         }

  336.     }

  337.     return 0;

  338. }

  339. 

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

  341. {

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

  343.     int i, j;

  344.     uint32_t *pal;

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

  346. 

  347.     if (end_buf - buf < 12)

  348.         return -1;

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

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

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

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

  353. 

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

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

  356.         return 0;

  357.     }

  358. 

  359.     if(count == 1){

  360.         switch(type){

  361.         case TIFF_BYTE:

  362.         case TIFF_SHORT:

  363.             buf -= 4;

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

  365.             buf = NULL;

  366.             break;

  367.         case TIFF_LONG:

  368.             value = off;

  369.             buf = NULL;

  370.             break;

  371.         case TIFF_STRING:

  372.             if(count <= 4){

  373.                 buf -= 4;

  374.                 break;

  375.             }

  376.         default:

  377.             value = UINT_MAX;

  378.             buf = start + off;

  379.         }

  380.     } else {

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

  382.             buf -= 4;

  383.         } else {

  384.             buf = start + off;

  385.         }

  386.     }

  387. 

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

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

  390.         return -1;

  391.     }

  392. 

  393.     switch(tag){

  394.     case TIFF_WIDTH:

  395.         s->width = value;

  396.         break;

  397.     case TIFF_HEIGHT:

  398.         s->height = value;

  399.         break;

  400.     case TIFF_BPP:

  401.         s->bppcount = count;

  402.         if(count > 4){

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

  404.             return -1;

  405.         }

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

  407.         else{

  408.             switch(type){

  409.             case TIFF_BYTE:

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

  411.                 break;

  412.             case TIFF_SHORT:

  413.             case TIFF_LONG:

  414.                 s->bpp = 0;

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

  416.                 break;

  417.             default:

  418.                 s->bpp = -1;

  419.             }

  420.         }

  421.         break;

  422.     case TIFF_SAMPLES_PER_PIXEL:

  423.         if (count != 1) {

  424.             av_log(s->avctx, AV_LOG_ERROR,

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

  426.             return AVERROR_INVALIDDATA;

  427.         }

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

  429.             s->bpp *= value;

  430.         s->bppcount = value;

  431.         break;

  432.     case TIFF_COMPR:

  433.         s->compr = value;

  434.         s->predictor = 0;

  435.         switch(s->compr){

  436.         case TIFF_RAW:

  437.         case TIFF_PACKBITS:

  438.         case TIFF_LZW:

  439.         case TIFF_CCITT_RLE:

  440.             break;

  441.         case TIFF_G3:

  442.         case TIFF_G4:

  443.             s->fax_opts = 0;

  444.             break;

  445.         case TIFF_DEFLATE:

  446.         case TIFF_ADOBE_DEFLATE:

  447. #if CONFIG_ZLIB

  448.             break;

  449. #else

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

  451.             return -1;

  452. #endif

  453.         case TIFF_JPEG:

  454.         case TIFF_NEWJPEG:

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

  456.             return -1;

  457.         default:

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

  459.             return -1;

  460.         }

  461.         break;

  462.     case TIFF_ROWSPERSTRIP:

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

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

  465.         if(value < 1){

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

  467.             return -1;

  468.         }

  469.         s->rps = value;

  470.         break;

  471.     case TIFF_STRIP_OFFS:

  472.         if(count == 1){

  473.             s->stripdata = NULL;

  474.             s->stripoff = value;

  475.         }else

  476.             s->stripdata = start + off;

  477.         s->strips = count;

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

  479.         s->sot = type;

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

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

  482.             return -1;

  483.         }

  484.         break;

  485.     case TIFF_STRIP_SIZE:

  486.         if(count == 1){

  487.             s->stripsizes = NULL;

  488.             s->stripsize = value;

  489.             s->strips = 1;

  490.         }else{

  491.             s->stripsizes = start + off;

  492.         }

  493.         s->strips = count;

  494.         s->sstype = type;

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

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

  497.             return -1;

  498.         }

  499.         break;

  500.     case TIFF_TILE_BYTE_COUNTS:

  501.     case TIFF_TILE_LENGTH:

  502.     case TIFF_TILE_OFFSETS:

  503.     case TIFF_TILE_WIDTH:

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

  505.         return AVERROR_PATCHWELCOME;

  506.         break;

  507.     case TIFF_PREDICTOR:

  508.         s->predictor = value;

  509.         break;

  510.     case TIFF_INVERT:

  511.         switch(value){

  512.         case 0:

  513.             s->invert = 1;

  514.             break;

  515.         case 1:

  516.             s->invert = 0;

  517.             break;

  518.         case 2:

  519.         case 3:

  520.             break;

  521.         default:

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

  523.             return -1;

  524.         }

  525.         break;

  526.     case TIFF_FILL_ORDER:

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

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

  529.             value = 1;

  530.         }

  531.         s->fill_order = value - 1;

  532.         break;

  533.     case TIFF_PAL:

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

  535.         off = type_sizes[type];

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

  537.             return -1;

  538.         rp = buf;

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

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

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

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

  543.             j = 0xff << 24;

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

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

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

  547.             pal[i] = j;

  548.         }

  549.         s->palette_is_set = 1;

  550.         break;

  551.     case TIFF_PLANAR:

  552.         if(value == 2){

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

  554.             return -1;

  555.         }

  556.         break;

  557.     case TIFF_T4OPTIONS:

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

  559.             s->fax_opts = value;

  560.         break;

  561.     case TIFF_T6OPTIONS:

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

  563.             s->fax_opts = value;

  564.         break;

  565.     default:

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

  567.     }

  568.     return 0;

  569. }

  570. 

  571. static int decode_frame(AVCodecContext *avctx,

  572.                         void *data, int *data_size,

  573.                         AVPacket *avpkt)

  574. {

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

  576.     int buf_size = avpkt->size;

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

  578.     AVFrame *picture = data;

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

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

  581.     unsigned off;

  582.     int id, le, ret;

  583.     int i, j, entries;

  584.     int stride;

  585.     unsigned soff, ssize;

  586.     uint8_t *dst;

  587. 

  588.     //parse image header

  589.     if (end_buf - buf < 8)

  590.         return AVERROR_INVALIDDATA;

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

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

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

  594.     else{

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

  596.         return -1;

  597.     }

  598.     s->le = le;

  599.     s->invert = 0;

  600.     s->compr = TIFF_RAW;

  601.     s->fill_order = 0;

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

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

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

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

  606.         return -1;

  607.     }

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

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

  610.     /* parse image file directory */

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

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

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

  614.         return AVERROR_INVALIDDATA;

  615.     }

  616.     buf = orig_buf + off;

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

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

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

  620.             return -1;

  621.         buf += 12;

  622.     }

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

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

  625.         return -1;

  626.     }

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

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

  629.         return ret;

  630. 

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

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

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

  634.     }

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

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

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

  638.         if(s->stripsizes) {

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

  640.                 return AVERROR_INVALIDDATA;

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

  642.         } else

  643.             ssize = s->stripsize;

  644. 

  645.         if(s->stripdata){

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

  647.                 return AVERROR_INVALIDDATA;

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

  649.         }else

  650.             soff = s->stripoff;

  651. 

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

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

  654.             return -1;

  655.         }

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

  657.             break;

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

  659.     }

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

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

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

  663.         ssize = s->width * soff;

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

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

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

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

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

  669.                 dst += stride;

  670.             }

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

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

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

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

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

  676.                 dst += stride;

  677.             }

  678.         } else {

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

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

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

  682.                 dst += stride;

  683.             }

  684.         }

  685.     }

  686. 

  687.     if(s->invert){

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

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

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

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

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

  693.         }

  694.     }

  695.     *picture   = s->picture;

  696.     *data_size = sizeof(AVPicture);

  697. 

  698.     return buf_size;

  699. }

  700. 

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

  702.     TiffContext *s = avctx->priv_data;

  703. 

  704.     s->width = 0;

  705.     s->height = 0;

  706.     s->avctx = avctx;

  707.     avcodec_get_frame_defaults(&s->picture);

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

  709.     ff_lzw_decode_open(&s->lzw);

  710.     ff_ccitt_unpack_init();

  711. 

  712.     return 0;

  713. }

  714. 

  715. static av_cold int tiff_end(AVCodecContext *avctx)

  716. {

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

  718. 

  719.     ff_lzw_decode_close(&s->lzw);

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

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

  722.     return 0;

  723. }

  724. 

  725. AVCodec ff_tiff_decoder = {

  726.     .name           = "tiff",

  727.     .type           = AVMEDIA_TYPE_VIDEO,

  728.     .id             = CODEC_ID_TIFF,

  729.     .priv_data_size = sizeof(TiffContext),

  730.     .init           = tiff_init,

  731.     .close          = tiff_end,

  732.     .decode         = decode_frame,

  733.     .capabilities   = CODEC_CAP_DR1,

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

  735. };