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.
42700 Commits
32 Branches
926MB
Tree: 55de89e25d
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '55de89e25d'
${ noResults }
FFmpeg/libavcodec/tiff.c

1182 lines
37KB
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. #include "bytestream.h"

  29. #if CONFIG_ZLIB

  30. #include <zlib.h>

  31. #endif

  32. #include "lzw.h"

  33. #include "tiff.h"

  34. #include "tiff_data.h"

  35. #include "faxcompr.h"

  36. #include "libavutil/common.h"

  37. #include "libavutil/intreadwrite.h"

  38. #include "libavutil/imgutils.h"

  39. #include "libavutil/avstring.h"

  40. 

  41. typedef struct TiffContext {

  42.     AVCodecContext *avctx;

  43.     AVFrame picture;

  44.     GetByteContext gb;

  45. 

  46.     int width, height;

  47.     unsigned int bpp, bppcount;

  48.     uint32_t palette[256];

  49.     int palette_is_set;

  50.     int le;

  51.     enum TiffCompr compr;

  52.     int invert;

  53.     int fax_opts;

  54.     int predictor;

  55.     int fill_order;

  56. 

  57.     int strips, rps, sstype;

  58.     int sot;

  59.     int stripsizesoff, stripsize, stripoff, strippos;

  60.     LZWState *lzw;

  61. 

  62.     int geotag_count;

  63.     TiffGeoTag *geotags;

  64. } TiffContext;

  65. 

  66. static unsigned tget_short(GetByteContext *gb, int le)

  67. {

  68.     unsigned v = le ? bytestream2_get_le16u(gb) : bytestream2_get_be16u(gb);

  69.     return v;

  70. }

  71. 

  72. static unsigned tget_long(GetByteContext *gb, int le)

  73. {

  74.     unsigned v = le ? bytestream2_get_le32u(gb) : bytestream2_get_be32u(gb);

  75.     return v;

  76. }

  77. 

  78. static double tget_double(GetByteContext *gb, int le)

  79. {

  80.     av_alias64 i = { .u64 = le ? bytestream2_get_le64u(gb) : bytestream2_get_be64u(gb)};

  81.     return i.f64;

  82. }

  83. 

  84. static unsigned tget(GetByteContext *gb, int type, int le)

  85. {

  86.     switch (type) {

  87.     case TIFF_BYTE : return bytestream2_get_byteu(gb);

  88.     case TIFF_SHORT: return tget_short(gb, le);

  89.     case TIFF_LONG : return tget_long(gb, le);

  90.     default        : return UINT_MAX;

  91.     }

  92. }

  93. 

  94. static void free_geotags(TiffContext *const s)

  95. {

  96.     int i;

  97.     for (i = 0; i < s->geotag_count; i++) {

  98.         if (s->geotags[i].val)

  99.             av_freep(&s->geotags[i].val);

  100.     }

  101.     av_freep(&s->geotags);

  102. }

  103. 

  104. #define RET_GEOKEY(TYPE, array, element)\

  105.     if (key >= TIFF_##TYPE##_KEY_ID_OFFSET &&\

  106.         key - TIFF_##TYPE##_KEY_ID_OFFSET < FF_ARRAY_ELEMS(ff_tiff_##array##_name_type_map))\

  107.         return ff_tiff_##array##_name_type_map[key - TIFF_##TYPE##_KEY_ID_OFFSET].element;

  108. 

  109. static const char *get_geokey_name(int key)

  110. {

  111.     RET_GEOKEY(VERT, vert, name);

  112.     RET_GEOKEY(PROJ, proj, name);

  113.     RET_GEOKEY(GEOG, geog, name);

  114.     RET_GEOKEY(CONF, conf, name);

  115. 

  116.     return NULL;

  117. }

  118. 

  119. static int get_geokey_type(int key)

  120. {

  121.     RET_GEOKEY(VERT, vert, type);

  122.     RET_GEOKEY(PROJ, proj, type);

  123.     RET_GEOKEY(GEOG, geog, type);

  124.     RET_GEOKEY(CONF, conf, type);

  125. 

  126.     return AVERROR_INVALIDDATA;

  127. }

  128. 

  129. static int cmp_id_key(const void *id, const void *k)

  130. {

  131.     return *(const int*)id - ((const TiffGeoTagKeyName*)k)->key;

  132. }

  133. 

  134. static const char *search_keyval(const TiffGeoTagKeyName *keys, int n, int id)

  135. {

  136.     return ((TiffGeoTagKeyName*)bsearch(&id, keys, n, sizeof(keys[0]), cmp_id_key))->name;

  137. }

  138. 

  139. static char *get_geokey_val(int key, int val)

  140. {

  141.     char *ap;

  142. 

  143.     if (val == TIFF_GEO_KEY_UNDEFINED)

  144.         return av_strdup("undefined");

  145.     if (val == TIFF_GEO_KEY_USER_DEFINED)

  146.         return av_strdup("User-Defined");

  147. 

  148. #define RET_GEOKEY_VAL(TYPE, array)\

  149.     if (val >= TIFF_##TYPE##_OFFSET &&\

  150.         val - TIFF_##TYPE##_OFFSET < FF_ARRAY_ELEMS(ff_tiff_##array##_codes))\

  151.         return av_strdup(ff_tiff_##array##_codes[val - TIFF_##TYPE##_OFFSET]);

  152. 

  153.     switch (key) {

  154.     case TIFF_GT_MODEL_TYPE_GEOKEY:

  155.         RET_GEOKEY_VAL(GT_MODEL_TYPE, gt_model_type);

  156.         break;

  157.     case TIFF_GT_RASTER_TYPE_GEOKEY:

  158.         RET_GEOKEY_VAL(GT_RASTER_TYPE, gt_raster_type);

  159.         break;

  160.     case TIFF_GEOG_LINEAR_UNITS_GEOKEY:

  161.     case TIFF_PROJ_LINEAR_UNITS_GEOKEY:

  162.     case TIFF_VERTICAL_UNITS_GEOKEY:

  163.         RET_GEOKEY_VAL(LINEAR_UNIT, linear_unit);

  164.         break;

  165.     case TIFF_GEOG_ANGULAR_UNITS_GEOKEY:

  166.     case TIFF_GEOG_AZIMUTH_UNITS_GEOKEY:

  167.         RET_GEOKEY_VAL(ANGULAR_UNIT, angular_unit);

  168.         break;

  169.     case TIFF_GEOGRAPHIC_TYPE_GEOKEY:

  170.         RET_GEOKEY_VAL(GCS_TYPE, gcs_type);

  171.         RET_GEOKEY_VAL(GCSE_TYPE, gcse_type);

  172.         break;

  173.     case TIFF_GEOG_GEODETIC_DATUM_GEOKEY:

  174.         RET_GEOKEY_VAL(GEODETIC_DATUM, geodetic_datum);

  175.         RET_GEOKEY_VAL(GEODETIC_DATUM_E, geodetic_datum_e);

  176.         break;

  177.     case TIFF_GEOG_ELLIPSOID_GEOKEY:

  178.         RET_GEOKEY_VAL(ELLIPSOID, ellipsoid);

  179.         break;

  180.     case TIFF_GEOG_PRIME_MERIDIAN_GEOKEY:

  181.         RET_GEOKEY_VAL(PRIME_MERIDIAN, prime_meridian);

  182.         break;

  183.     case TIFF_PROJECTED_CS_TYPE_GEOKEY:

  184.         return av_strdup(search_keyval(ff_tiff_proj_cs_type_codes, FF_ARRAY_ELEMS(ff_tiff_proj_cs_type_codes), val));

  185.         break;

  186.     case TIFF_PROJECTION_GEOKEY:

  187.         return av_strdup(search_keyval(ff_tiff_projection_codes, FF_ARRAY_ELEMS(ff_tiff_projection_codes), val));

  188.         break;

  189.     case TIFF_PROJ_COORD_TRANS_GEOKEY:

  190.         RET_GEOKEY_VAL(COORD_TRANS, coord_trans);

  191.         break;

  192.     case TIFF_VERTICAL_CS_TYPE_GEOKEY:

  193.         RET_GEOKEY_VAL(VERT_CS, vert_cs);

  194.         RET_GEOKEY_VAL(ORTHO_VERT_CS, ortho_vert_cs);

  195.         break;

  196. 

  197.     }

  198. 

  199.     ap = av_malloc(14);

  200.     if (ap)

  201.         snprintf(ap, 14, "Unknown-%d", val);

  202.     return ap;

  203. }

  204. 

  205. static char *doubles2str(double *dp, int count, const char *sep)

  206. {

  207.     int i;

  208.     char *ap, *ap0;

  209.     if (!sep) sep = ", ";

  210.     ap = av_malloc((15 + strlen(sep)) * count);

  211.     if (!ap)

  212.         return NULL;

  213.     ap0   = ap;

  214.     ap[0] = '\0';

  215.     for (i = 0; i < count; i++) {

  216.         int l = snprintf(ap, 15 + strlen(sep), "%f%s", dp[i], sep);

  217.         ap += l;

  218.     }

  219.     ap0[strlen(ap0) - strlen(sep)] = '\0';

  220.     return ap0;

  221. }

  222. 

  223. static char *shorts2str(int16_t *sp, int count, const char *sep)

  224. {

  225.     int i;

  226.     char *ap, *ap0;

  227.     if (!sep) sep = ", ";

  228.     ap = av_malloc((5 + strlen(sep)) * count);

  229.     if (!ap)

  230.         return NULL;

  231.     ap0   = ap;

  232.     ap[0] = '\0';

  233.     for (i = 0; i < count; i++) {

  234.         int l = snprintf(ap, 5 + strlen(sep), "%d%s", sp[i], sep);

  235.         ap += l;

  236.     }

  237.     ap0[strlen(ap0) - strlen(sep)] = '\0';

  238.     return ap0;

  239. }

  240. 

  241. static int add_doubles_metadata(int count,

  242.                                 const char *name, const char *sep,

  243.                                 TiffContext *s)

  244. {

  245.     char *ap;

  246.     int i;

  247.     double *dp;

  248. 

  249.     if (count >= INT_MAX / sizeof(int64_t))

  250.         return AVERROR_INVALIDDATA;

  251.     if (bytestream2_get_bytes_left(&s->gb) < count * sizeof(int64_t))

  252.         return AVERROR_INVALIDDATA;

  253. 

  254.     dp = av_malloc(count * sizeof(double));

  255.     if (!dp)

  256.         return AVERROR(ENOMEM);

  257. 

  258.     for (i = 0; i < count; i++)

  259.         dp[i] = tget_double(&s->gb, s->le);

  260.     ap = doubles2str(dp, count, sep);

  261.     av_freep(&dp);

  262.     if (!ap)

  263.         return AVERROR(ENOMEM);

  264.     av_dict_set(&s->picture.metadata, name, ap, AV_DICT_DONT_STRDUP_VAL);

  265.     return 0;

  266. }

  267. 

  268. static int add_shorts_metadata(int count, const char *name,

  269.                                const char *sep, TiffContext *s)

  270. {

  271.     char *ap;

  272.     int i;

  273.     int16_t *sp;

  274. 

  275.     if (count >= INT_MAX / sizeof(int16_t))

  276.         return AVERROR_INVALIDDATA;

  277.     if (bytestream2_get_bytes_left(&s->gb) < count * sizeof(int16_t))

  278.         return AVERROR_INVALIDDATA;

  279. 

  280.     sp = av_malloc(count * sizeof(int16_t));

  281.     if (!sp)

  282.         return AVERROR(ENOMEM);

  283. 

  284.     for (i = 0; i < count; i++)

  285.         sp[i] = tget_short(&s->gb, s->le);

  286.     ap = shorts2str(sp, count, sep);

  287.     av_freep(&sp);

  288.     if (!ap)

  289.         return AVERROR(ENOMEM);

  290.     av_dict_set(&s->picture.metadata, name, ap, AV_DICT_DONT_STRDUP_VAL);

  291.     return 0;

  292. }

  293. 

  294. static int add_string_metadata(int count, const char *name,

  295.                                TiffContext *s)

  296. {

  297.     char *value;

  298. 

  299.     if (bytestream2_get_bytes_left(&s->gb) < count)

  300.         return AVERROR_INVALIDDATA;

  301. 

  302.     value = av_malloc(count + 1);

  303.     if (!value)

  304.         return AVERROR(ENOMEM);

  305. 

  306.     bytestream2_get_bufferu(&s->gb, value, count);

  307.     value[count] = 0;

  308. 

  309.     av_dict_set(&s->picture.metadata, name, value, AV_DICT_DONT_STRDUP_VAL);

  310.     return 0;

  311. }

  312. 

  313. static int add_metadata(int count, int type,

  314.                         const char *name, const char *sep, TiffContext *s)

  315. {

  316.     switch(type) {

  317.     case TIFF_DOUBLE: return add_doubles_metadata(count, name, sep, s);

  318.     case TIFF_SHORT : return add_shorts_metadata(count, name, sep, s);

  319.     case TIFF_STRING: return add_string_metadata(count, name, s);

  320.     default         : return AVERROR_INVALIDDATA;

  321.     };

  322. }

  323. 

  324. #if CONFIG_ZLIB

  325. static int tiff_uncompress(uint8_t *dst, unsigned long *len, const uint8_t *src,

  326.                            int size)

  327. {

  328.     z_stream zstream = { 0 };

  329.     int zret;

  330. 

  331.     zstream.next_in = src;

  332.     zstream.avail_in = size;

  333.     zstream.next_out = dst;

  334.     zstream.avail_out = *len;

  335.     zret = inflateInit(&zstream);

  336.     if (zret != Z_OK) {

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

  338.         return zret;

  339.     }

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

  341.     inflateEnd(&zstream);

  342.     *len = zstream.total_out;

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

  344. }

  345. #endif

  346. 

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

  348.                                              int usePtr, const uint8_t *src,

  349.                                              uint8_t c, int width, int offset)

  350. {

  351.     switch (bpp) {

  352.     case 1:

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

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

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

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

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

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

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

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

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

  362.         }

  363.         break;

  364.     case 2:

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

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

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

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

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

  370.         }

  371.         break;

  372.     case 4:

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

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

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

  376.         }

  377.         break;

  378.     default:

  379.         if (usePtr) {

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

  381.         } else {

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

  383.         }

  384.     }

  385. }

  386. 

  387. static int tiff_unpack_strip(TiffContext *s, uint8_t *dst, int stride,

  388.                              const uint8_t *src, int size, int lines)

  389. {

  390.     int c, line, pixels, code;

  391.     const uint8_t *ssrc = src;

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

  393. 

  394.     if (size <= 0)

  395.         return AVERROR_INVALIDDATA;

  396. 

  397. #if CONFIG_ZLIB

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

  399.         uint8_t *zbuf;

  400.         unsigned long outlen;

  401.         int ret;

  402.         outlen = width * lines;

  403.         zbuf = av_malloc(outlen);

  404.         if (!zbuf)

  405.             return AVERROR(ENOMEM);

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

  407.         if (ret != Z_OK) {

  408.             av_log(s->avctx, AV_LOG_ERROR,

  409.                    "Uncompressing failed (%lu of %lu) with error %d\n", outlen,

  410.                    (unsigned long)width * lines, ret);

  411.             av_free(zbuf);

  412.             return -1;

  413.         }

  414.         src = zbuf;

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

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

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

  418.             }else{

  419.                 memcpy(dst, src, width);

  420.             }

  421.             dst += stride;

  422.             src += width;

  423.         }

  424.         av_free(zbuf);

  425.         return 0;

  426.     }

  427. #endif

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

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

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

  431.             return -1;

  432.         }

  433.     }

  434.     if (s->compr == TIFF_CCITT_RLE || s->compr == TIFF_G3

  435.         || s->compr == TIFF_G4) {

  436.         int i, ret = 0;

  437.         uint8_t *src2 = av_malloc((unsigned)size +

  438.                                   FF_INPUT_BUFFER_PADDING_SIZE);

  439. 

  440.         if (!src2) {

  441.             av_log(s->avctx, AV_LOG_ERROR,

  442.                    "Error allocating temporary buffer\n");

  443.             return AVERROR(ENOMEM);

  444.         }

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

  446.             av_log(s->avctx, AV_LOG_ERROR,

  447.                    "Uncompressed fax mode is not supported (yet)\n");

  448.             av_free(src2);

  449.             return -1;

  450.         }

  451.         if (!s->fill_order) {

  452.             memcpy(src2, src, size);

  453.         } else {

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

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

  456.         }

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

  458.         switch (s->compr) {

  459.         case TIFF_CCITT_RLE:

  460.         case TIFF_G3:

  461.         case TIFF_G4:

  462.             ret = ff_ccitt_unpack(s->avctx, src2, size, dst, lines, stride,

  463.                                   s->compr, s->fax_opts);

  464.             break;

  465.         }

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

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

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

  469.                 dst += stride;

  470.             }

  471.         av_free(src2);

  472.         return ret;

  473.     }

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

  475.         if (src - ssrc > size) {

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

  477.             return -1;

  478.         }

  479.         switch (s->compr) {

  480.         case TIFF_RAW:

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

  482.                 return AVERROR_INVALIDDATA;

  483.             if (!s->fill_order) {

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

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

  486.             } else {

  487.                 int i;

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

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

  490.             }

  491.             src += width;

  492.             break;

  493.         case TIFF_PACKBITS:

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

  495.                 if (ssrc + size - src < 2) {

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

  497.                     return AVERROR_INVALIDDATA;

  498.                 }

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

  500.                 if (code >= 0) {

  501.                     code++;

  502.                     if (pixels + code > width) {

  503.                         av_log(s->avctx, AV_LOG_ERROR,

  504.                                "Copy went out of bounds\n");

  505.                         return -1;

  506.                     }

  507.                     if (ssrc + size - src < code) {

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

  509.                         return AVERROR_INVALIDDATA;

  510.                     }

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

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

  513.                     src += code;

  514.                     pixels += code;

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

  516.                     code = (-code) + 1;

  517.                     if (pixels + code > width) {

  518.                         av_log(s->avctx, AV_LOG_ERROR,

  519.                                "Run went out of bounds\n");

  520.                         return -1;

  521.                     }

  522.                     c = *src++;

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

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

  525.                     pixels += code;

  526.                 }

  527.             }

  528.             break;

  529.         case TIFF_LZW:

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

  531.             if (pixels < width) {

  532.                 av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n",

  533.                        pixels, width);

  534.                 return -1;

  535.             }

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

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

  538.             break;

  539.         }

  540.         dst += stride;

  541.     }

  542.     return 0;

  543. }

  544. 

  545. static int init_image(TiffContext *s)

  546. {

  547.     int i, ret;

  548.     uint32_t *pal;

  549. 

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

  551.     case 11:

  552.         if (!s->palette_is_set) {

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

  554.             break;

  555.         }

  556.     case 21:

  557.     case 41:

  558.     case 81:

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

  560.         break;

  561.     case 243:

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

  563.         break;

  564.     case 161:

  565.         s->avctx->pix_fmt = s->le ? PIX_FMT_GRAY16LE : PIX_FMT_GRAY16BE;

  566.         break;

  567.     case 162:

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

  569.         break;

  570.     case 324:

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

  572.         break;

  573.     case 483:

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

  575.         break;

  576.     case 644:

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

  578.         break;

  579.     default:

  580.         av_log(s->avctx, AV_LOG_ERROR,

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

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

  583.         return AVERROR_INVALIDDATA;

  584.     }

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

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

  587.             return ret;

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

  589.     }

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

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

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

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

  594.         return ret;

  595.     }

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

  597.         if (s->palette_is_set) {

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

  599.         } else {

  600.             /* make default grayscale pal */

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

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

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

  604.         }

  605.     }

  606.     return 0;

  607. }

  608. 

  609. static int tiff_decode_tag(TiffContext *s)

  610. {

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

  612.     int i, j, k, pos, start;

  613.     int ret;

  614.     uint32_t *pal;

  615.     double *dp;

  616. 

  617.     tag   = tget_short(&s->gb, s->le);

  618.     type  = tget_short(&s->gb, s->le);

  619.     count = tget_long(&s->gb, s->le);

  620.     off   = tget_long(&s->gb, s->le);

  621.     start = bytestream2_tell(&s->gb);

  622. 

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

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

  625.                type);

  626.         return 0;

  627.     }

  628. 

  629.     if (count == 1) {

  630.         switch (type) {

  631.         case TIFF_BYTE:

  632.         case TIFF_SHORT:

  633.             bytestream2_seek(&s->gb, -4, SEEK_CUR);

  634.             value = tget(&s->gb, type, s->le);

  635.             break;

  636.         case TIFF_LONG:

  637.             value = off;

  638.             break;

  639.         case TIFF_STRING:

  640.             if (count <= 4) {

  641.                 bytestream2_seek(&s->gb, -4, SEEK_CUR);

  642.                 break;

  643.             }

  644.         default:

  645.             value = UINT_MAX;

  646.             bytestream2_seek(&s->gb, off, SEEK_SET);

  647.         }

  648.     } else {

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

  650.             bytestream2_seek(&s->gb, -4, SEEK_CUR);

  651.         } else {

  652.             bytestream2_seek(&s->gb, off, SEEK_SET);

  653.         }

  654.     }

  655. 

  656.     switch (tag) {

  657.     case TIFF_WIDTH:

  658.         s->width = value;

  659.         break;

  660.     case TIFF_HEIGHT:

  661.         s->height = value;

  662.         break;

  663.     case TIFF_BPP:

  664.         s->bppcount = count;

  665.         if (count > 4) {

  666.             av_log(s->avctx, AV_LOG_ERROR,

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

  668.                    s->bpp, count);

  669.             return -1;

  670.         }

  671.         if (count == 1)

  672.             s->bpp = value;

  673.         else {

  674.             switch (type) {

  675.             case TIFF_BYTE:

  676.                 s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) +

  677.                          ((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);

  678.                 break;

  679.             case TIFF_SHORT:

  680.             case TIFF_LONG:

  681.                 s->bpp = 0;

  682.                 if (bytestream2_get_bytes_left(&s->gb) < type_sizes[type] * count)

  683.                     return -1;

  684.                 for (i = 0; i < count; i++)

  685.                     s->bpp += tget(&s->gb, type, s->le);

  686.                 break;

  687.             default:

  688.                 s->bpp = -1;

  689.             }

  690.         }

  691.         break;

  692.     case TIFF_SAMPLES_PER_PIXEL:

  693.         if (count != 1) {

  694.             av_log(s->avctx, AV_LOG_ERROR,

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

  696.             return AVERROR_INVALIDDATA;

  697.         }

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

  699.             s->bpp *= value;

  700.         s->bppcount = value;

  701.         break;

  702.     case TIFF_COMPR:

  703.         s->compr = value;

  704.         s->predictor = 0;

  705.         switch (s->compr) {

  706.         case TIFF_RAW:

  707.         case TIFF_PACKBITS:

  708.         case TIFF_LZW:

  709.         case TIFF_CCITT_RLE:

  710.             break;

  711.         case TIFF_G3:

  712.         case TIFF_G4:

  713.             s->fax_opts = 0;

  714.             break;

  715.         case TIFF_DEFLATE:

  716.         case TIFF_ADOBE_DEFLATE:

  717. #if CONFIG_ZLIB

  718.             break;

  719. #else

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

  721.             return -1;

  722. #endif

  723.         case TIFF_JPEG:

  724.         case TIFF_NEWJPEG:

  725.             av_log(s->avctx, AV_LOG_ERROR,

  726.                    "JPEG compression is not supported\n");

  727.             return -1;

  728.         default:

  729.             av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n",

  730.                    s->compr);

  731.             return -1;

  732.         }

  733.         break;

  734.     case TIFF_ROWSPERSTRIP:

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

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

  737.         if (value < 1) {

  738.             av_log(s->avctx, AV_LOG_ERROR,

  739.                    "Incorrect value of rows per strip\n");

  740.             return -1;

  741.         }

  742.         s->rps = value;

  743.         break;

  744.     case TIFF_STRIP_OFFS:

  745.         if (count == 1) {

  746.             s->strippos = 0;

  747.             s->stripoff = value;

  748.         } else

  749.             s->strippos = off;

  750.         s->strips = count;

  751.         if (s->strips == 1)

  752.             s->rps = s->height;

  753.         s->sot = type;

  754.         if (s->strippos > bytestream2_size(&s->gb)) {

  755.             av_log(s->avctx, AV_LOG_ERROR,

  756.                    "Tag referencing position outside the image\n");

  757.             return -1;

  758.         }

  759.         break;

  760.     case TIFF_STRIP_SIZE:

  761.         if (count == 1) {

  762.             s->stripsizesoff = 0;

  763.             s->stripsize = value;

  764.             s->strips = 1;

  765.         } else {

  766.             s->stripsizesoff = off;

  767.         }

  768.         s->strips = count;

  769.         s->sstype = type;

  770.         if (s->stripsizesoff > bytestream2_size(&s->gb)) {

  771.             av_log(s->avctx, AV_LOG_ERROR,

  772.                    "Tag referencing position outside the image\n");

  773.             return -1;

  774.         }

  775.         break;

  776.     case TIFF_TILE_BYTE_COUNTS:

  777.     case TIFF_TILE_LENGTH:

  778.     case TIFF_TILE_OFFSETS:

  779.     case TIFF_TILE_WIDTH:

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

  781.         return AVERROR_PATCHWELCOME;

  782.         break;

  783.     case TIFF_PREDICTOR:

  784.         s->predictor = value;

  785.         break;

  786.     case TIFF_INVERT:

  787.         switch (value) {

  788.         case 0:

  789.             s->invert = 1;

  790.             break;

  791.         case 1:

  792.             s->invert = 0;

  793.             break;

  794.         case 2:

  795.         case 3:

  796.             break;

  797.         default:

  798.             av_log(s->avctx, AV_LOG_ERROR, "Color mode %d is not supported\n",

  799.                    value);

  800.             return -1;

  801.         }

  802.         break;

  803.     case TIFF_FILL_ORDER:

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

  805.             av_log(s->avctx, AV_LOG_ERROR,

  806.                    "Unknown FillOrder value %d, trying default one\n", value);

  807.             value = 1;

  808.         }

  809.         s->fill_order = value - 1;

  810.         break;

  811.     case TIFF_PAL:

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

  813.         off = type_sizes[type];

  814.         if (count / 3 > 256 || bytestream2_get_bytes_left(&s->gb) < count / 3 * off * 3)

  815.             return -1;

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

  817.         for (k = 2; k >= 0; k--) {

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

  819.                 if (k == 2)

  820.                     pal[i] = 0xff << 24;

  821.                 j =  (tget(&s->gb, type, s->le) >> off) << (k * 8);

  822.                 pal[i] |= j;

  823.             }

  824.         }

  825.         s->palette_is_set = 1;

  826.         break;

  827.     case TIFF_PLANAR:

  828.         if (value == 2) {

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

  830.             return -1;

  831.         }

  832.         break;

  833.     case TIFF_T4OPTIONS:

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

  835.             s->fax_opts = value;

  836.         break;

  837.     case TIFF_T6OPTIONS:

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

  839.             s->fax_opts = value;

  840.         break;

  841. #define ADD_METADATA(count, name, sep)\

  842.     if (ret = add_metadata(count, type, name, sep, s) < 0) {\

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

  844.         return ret;\

  845.     }

  846.     case TIFF_MODEL_PIXEL_SCALE:

  847.         ADD_METADATA(count, "ModelPixelScaleTag", NULL);

  848.         break;

  849.     case TIFF_MODEL_TRANSFORMATION:

  850.         ADD_METADATA(count, "ModelTransformationTag", NULL);

  851.         break;

  852.     case TIFF_MODEL_TIEPOINT:

  853.         ADD_METADATA(count, "ModelTiepointTag", NULL);

  854.         break;

  855.     case TIFF_GEO_KEY_DIRECTORY:

  856.         ADD_METADATA(1, "GeoTIFF_Version", NULL);

  857.         ADD_METADATA(2, "GeoTIFF_Key_Revision", ".");

  858.         s->geotag_count   = tget_short(&s->gb, s->le);

  859.         if (s->geotag_count > count / 4 - 1) {

  860.             s->geotag_count = count / 4 - 1;

  861.             av_log(s->avctx, AV_LOG_WARNING, "GeoTIFF key directory buffer shorter than specified\n");

  862.         }

  863.         if (bytestream2_get_bytes_left(&s->gb) < s->geotag_count * sizeof(int16_t) * 4)

  864.             return -1;

  865.         s->geotags = av_mallocz(sizeof(TiffGeoTag) * s->geotag_count);

  866.         if (!s->geotags) {

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

  868.             return AVERROR(ENOMEM);

  869.         }

  870.         for (i = 0; i < s->geotag_count; i++) {

  871.             s->geotags[i].key    = tget_short(&s->gb, s->le);

  872.             s->geotags[i].type   = tget_short(&s->gb, s->le);

  873.             s->geotags[i].count  = tget_short(&s->gb, s->le);

  874. 

  875.             if (!s->geotags[i].type)

  876.                 s->geotags[i].val  = get_geokey_val(s->geotags[i].key, tget_short(&s->gb, s->le));

  877.             else

  878.                 s->geotags[i].offset = tget_short(&s->gb, s->le);

  879.         }

  880.         break;

  881.     case TIFF_GEO_DOUBLE_PARAMS:

  882.         if (count >= INT_MAX / sizeof(int64_t))

  883.             return AVERROR_INVALIDDATA;

  884.         if (bytestream2_get_bytes_left(&s->gb) < count * sizeof(int64_t))

  885.             return AVERROR_INVALIDDATA;

  886.         dp = av_malloc(count * sizeof(double));

  887.         if (!dp) {

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

  889.             return AVERROR(ENOMEM);

  890.         }

  891.         for (i = 0; i < count; i++)

  892.             dp[i] = tget_double(&s->gb, s->le);

  893.         for (i = 0; i < s->geotag_count; i++) {

  894.             if (s->geotags[i].type == TIFF_GEO_DOUBLE_PARAMS) {

  895.                 if (s->geotags[i].count == 0

  896.                     || s->geotags[i].offset + s->geotags[i].count > count) {

  897.                     av_log(s->avctx, AV_LOG_WARNING, "Invalid GeoTIFF key %d\n", s->geotags[i].key);

  898.                 } else {

  899.                     char *ap = doubles2str(&dp[s->geotags[i].offset], s->geotags[i].count, ", ");

  900.                     if (!ap) {

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

  902.                         av_freep(&dp);

  903.                         return AVERROR(ENOMEM);

  904.                     }

  905.                     s->geotags[i].val = ap;

  906.                 }

  907.             }

  908.         }

  909.         av_freep(&dp);

  910.         break;

  911.     case TIFF_GEO_ASCII_PARAMS:

  912.         pos = bytestream2_tell(&s->gb);

  913.         for (i = 0; i < s->geotag_count; i++) {

  914.             if (s->geotags[i].type == TIFF_GEO_ASCII_PARAMS) {

  915.                 if (s->geotags[i].count == 0

  916.                     || s->geotags[i].offset +  s->geotags[i].count > count) {

  917.                     av_log(s->avctx, AV_LOG_WARNING, "Invalid GeoTIFF key %d\n", s->geotags[i].key);

  918.                 } else {

  919.                     char *ap;

  920. 

  921.                     bytestream2_seek(&s->gb, pos + s->geotags[i].offset, SEEK_SET);

  922.                     if (bytestream2_get_bytes_left(&s->gb) < s->geotags[i].count)

  923.                         return -1;

  924.                     ap = av_malloc(s->geotags[i].count);

  925.                     if (!ap) {

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

  927.                         return AVERROR(ENOMEM);

  928.                     }

  929.                     bytestream2_get_bufferu(&s->gb, ap, s->geotags[i].count);

  930.                     ap[s->geotags[i].count - 1] = '\0'; //replace the "|" delimiter with a 0 byte

  931.                     s->geotags[i].val = ap;

  932.                 }

  933.             }

  934.         }

  935.         break;

  936.     case TIFF_ARTIST:

  937.         ADD_METADATA(count, "artist", NULL);

  938.         break;

  939.     case TIFF_COPYRIGHT:

  940.         ADD_METADATA(count, "copyright", NULL);

  941.         break;

  942.     case TIFF_DATE:

  943.         ADD_METADATA(count, "date", NULL);

  944.         break;

  945.     case TIFF_DOCUMENT_NAME:

  946.         ADD_METADATA(count, "document_name", NULL);

  947.         break;

  948.     case TIFF_HOST_COMPUTER:

  949.         ADD_METADATA(count, "computer", NULL);

  950.         break;

  951.     case TIFF_IMAGE_DESCRIPTION:

  952.         ADD_METADATA(count, "description", NULL);

  953.         break;

  954.     case TIFF_MAKE:

  955.         ADD_METADATA(count, "make", NULL);

  956.         break;

  957.     case TIFF_MODEL:

  958.         ADD_METADATA(count, "model", NULL);

  959.         break;

  960.     case TIFF_PAGE_NAME:

  961.         ADD_METADATA(count, "page_name", NULL);

  962.         break;

  963.     case TIFF_PAGE_NUMBER:

  964.         ADD_METADATA(count, "page_number", " / ");

  965.         break;

  966.     case TIFF_SOFTWARE_NAME:

  967.         ADD_METADATA(count, "software", NULL);

  968.         break;

  969.     default:

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

  971.                tag, tag);

  972.     }

  973.     bytestream2_seek(&s->gb, start, SEEK_SET);

  974.     return 0;

  975. }

  976. 

  977. static int decode_frame(AVCodecContext *avctx,

  978.                         void *data, int *data_size, AVPacket *avpkt)

  979. {

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

  981.     AVFrame *picture = data;

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

  983.     unsigned off;

  984.     int id, le, ret;

  985.     int i, j, entries;

  986.     int stride;

  987.     unsigned soff, ssize;

  988.     uint8_t *dst;

  989.     GetByteContext stripsizes;

  990.     GetByteContext stripdata;

  991. 

  992.     bytestream2_init(&s->gb, avpkt->data, avpkt->size);

  993. 

  994.     //parse image header

  995.     if (avpkt->size < 8)

  996.         return AVERROR_INVALIDDATA;

  997.     id = bytestream2_get_le16u(&s->gb);

  998.     if (id == 0x4949)

  999.         le = 1;

  1000.     else if (id == 0x4D4D)

  1001.         le = 0;

  1002.     else {

  1003.         av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");

  1004.         return -1;

  1005.     }

  1006.     s->le = le;

  1007.     s->invert = 0;

  1008.     s->compr = TIFF_RAW;

  1009.     s->fill_order = 0;

  1010.     free_geotags(s);

  1011.     /* free existing metadata */

  1012.     av_dict_free(&s->picture.metadata);

  1013. 

  1014.     // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number

  1015.     // that further identifies the file as a TIFF file"

  1016.     if (tget_short(&s->gb, le) != 42) {

  1017.         av_log(avctx, AV_LOG_ERROR,

  1018.                "The answer to life, universe and everything is not correct!\n");

  1019.         return -1;

  1020.     }

  1021.     // Reset these offsets so we can tell if they were set this frame

  1022.     s->stripsizesoff = s->strippos = 0;

  1023.     /* parse image file directory */

  1024.     off = tget_long(&s->gb, le);

  1025.     if (off >= UINT_MAX - 14 || avpkt->size < off + 14) {

  1026.         av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");

  1027.         return AVERROR_INVALIDDATA;

  1028.     }

  1029.     bytestream2_seek(&s->gb, off, SEEK_SET);

  1030.     entries = tget_short(&s->gb, le);

  1031.     if (bytestream2_get_bytes_left(&s->gb) < entries * 12)

  1032.         return AVERROR_INVALIDDATA;

  1033.     for (i = 0; i < entries; i++) {

  1034.         if (tiff_decode_tag(s) < 0)

  1035.             return -1;

  1036.     }

  1037. 

  1038.     for (i = 0; i<s->geotag_count; i++) {

  1039.         const char *keyname = get_geokey_name(s->geotags[i].key);

  1040.         if (!keyname) {

  1041.             av_log(avctx, AV_LOG_WARNING, "Unknown or unsupported GeoTIFF key %d\n", s->geotags[i].key);

  1042.             continue;

  1043.         }

  1044.         if (get_geokey_type(s->geotags[i].key) != s->geotags[i].type) {

  1045.             av_log(avctx, AV_LOG_WARNING, "Type of GeoTIFF key %d is wrong\n", s->geotags[i].key);

  1046.             continue;

  1047.         }

  1048.         ret = av_dict_set(&s->picture.metadata, keyname, s->geotags[i].val, 0);

  1049.         if (ret<0) {

  1050.             av_log(avctx, AV_LOG_ERROR, "Writing metadata with key '%s' failed\n", keyname);

  1051.             return ret;

  1052.         }

  1053.     }

  1054. 

  1055.     if (!s->strippos && !s->stripoff) {

  1056.         av_log(avctx, AV_LOG_ERROR, "Image data is missing\n");

  1057.         return -1;

  1058.     }

  1059.     /* now we have the data and may start decoding */

  1060.     if ((ret = init_image(s)) < 0)

  1061.         return ret;

  1062. 

  1063.     if (s->strips == 1 && !s->stripsize) {

  1064.         av_log(avctx, AV_LOG_WARNING, "Image data size missing\n");

  1065.         s->stripsize = avpkt->size - s->stripoff;

  1066.     }

  1067.     stride = p->linesize[0];

  1068.     dst = p->data[0];

  1069. 

  1070.     if (s->stripsizesoff) {

  1071.         if (s->stripsizesoff >= avpkt->size)

  1072.             return AVERROR_INVALIDDATA;

  1073.         bytestream2_init(&stripsizes, avpkt->data + s->stripsizesoff, avpkt->size - s->stripsizesoff);

  1074.     }

  1075.     if (s->strippos) {

  1076.         if (s->strippos >= avpkt->size)

  1077.             return AVERROR_INVALIDDATA;

  1078.         bytestream2_init(&stripdata, avpkt->data + s->strippos, avpkt->size - s->strippos);

  1079.     }

  1080. 

  1081.     for (i = 0; i < s->height; i += s->rps) {

  1082.         if (s->stripsizesoff)

  1083.             ssize = tget(&stripsizes, s->sstype, s->le);

  1084.         else

  1085.             ssize = s->stripsize;

  1086. 

  1087.         if (s->strippos)

  1088.             soff = tget(&stripdata, s->sot, s->le);

  1089.         else

  1090.             soff = s->stripoff;

  1091. 

  1092.         if (soff > avpkt->size || ssize > avpkt->size - soff) {

  1093.             av_log(avctx, AV_LOG_ERROR, "Invalid strip size/offset\n");

  1094.             return -1;

  1095.         }

  1096.         if (tiff_unpack_strip(s, dst, stride, avpkt->data + soff, ssize,

  1097.                               FFMIN(s->rps, s->height - i)) < 0)

  1098.             break;

  1099.         dst += s->rps * stride;

  1100.     }

  1101.     if (s->predictor == 2) {

  1102.         dst = p->data[0];

  1103.         soff = s->bpp >> 3;

  1104.         ssize = s->width * soff;

  1105.         if (s->avctx->pix_fmt == PIX_FMT_RGB48LE ||

  1106.             s->avctx->pix_fmt == PIX_FMT_RGBA64LE) {

  1107.             for (i = 0; i < s->height; i++) {

  1108.                 for (j = soff; j < ssize; j += 2)

  1109.                     AV_WL16(dst + j, AV_RL16(dst + j) + AV_RL16(dst + j - soff));

  1110.                 dst += stride;

  1111.             }

  1112.         } else if (s->avctx->pix_fmt == PIX_FMT_RGB48BE ||

  1113.                    s->avctx->pix_fmt == PIX_FMT_RGBA64BE) {

  1114.             for (i = 0; i < s->height; i++) {

  1115.                 for (j = soff; j < ssize; j += 2)

  1116.                     AV_WB16(dst + j, AV_RB16(dst + j) + AV_RB16(dst + j - soff));

  1117.                 dst += stride;

  1118.             }

  1119.         } else {

  1120.             for (i = 0; i < s->height; i++) {

  1121.                 for (j = soff; j < ssize; j++)

  1122.                     dst[j] += dst[j - soff];

  1123.                 dst += stride;

  1124.             }

  1125.         }

  1126.     }

  1127. 

  1128.     if (s->invert) {

  1129.         dst = s->picture.data[0];

  1130.         for (i = 0; i < s->height; i++) {

  1131.             for (j = 0; j < s->picture.linesize[0]; j++)

  1132.                 dst[j] = (s->avctx->pix_fmt == PIX_FMT_PAL8 ? (1<<s->bpp) - 1 : 255) - dst[j];

  1133.             dst += s->picture.linesize[0];

  1134.         }

  1135.     }

  1136.     *picture   = s->picture;

  1137.     *data_size = sizeof(AVPicture);

  1138. 

  1139.     return avpkt->size;

  1140. }

  1141. 

  1142. static av_cold int tiff_init(AVCodecContext *avctx)

  1143. {

  1144.     TiffContext *s = avctx->priv_data;

  1145. 

  1146.     s->width = 0;

  1147.     s->height = 0;

  1148.     s->avctx = avctx;

  1149.     avcodec_get_frame_defaults(&s->picture);

  1150.     avctx->coded_frame = &s->picture;

  1151.     ff_lzw_decode_open(&s->lzw);

  1152.     ff_ccitt_unpack_init();

  1153. 

  1154.     return 0;

  1155. }

  1156. 

  1157. static av_cold int tiff_end(AVCodecContext *avctx)

  1158. {

  1159.     TiffContext *const s = avctx->priv_data;

  1160. 

  1161.     free_geotags(s);

  1162.     if (avctx->coded_frame && avctx->coded_frame->metadata)

  1163.         av_dict_free(&avctx->coded_frame->metadata);

  1164. 

  1165.     ff_lzw_decode_close(&s->lzw);

  1166.     if (s->picture.data[0])

  1167.         avctx->release_buffer(avctx, &s->picture);

  1168.     return 0;

  1169. }

  1170. 

  1171. AVCodec ff_tiff_decoder = {

  1172.     .name           = "tiff",

  1173.     .type           = AVMEDIA_TYPE_VIDEO,

  1174.     .id             = CODEC_ID_TIFF,

  1175.     .priv_data_size = sizeof(TiffContext),

  1176.     .init           = tiff_init,

  1177.     .close          = tiff_end,

  1178.     .decode         = decode_frame,

  1179.     .capabilities   = CODEC_CAP_DR1,

  1180.     .long_name      = NULL_IF_CONFIG_SMALL("TIFF image"),

  1181. };