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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. #include "bytestream.h"

  29. #include "config.h"

  30. #if CONFIG_ZLIB

  31. #include <zlib.h>

  32. #endif

  33. #include "lzw.h"

  34. #include "tiff.h"

  35. #include "tiff_data.h"

  36. #include "faxcompr.h"

  37. #include "libavutil/common.h"

  38. #include "libavutil/intreadwrite.h"

  39. #include "libavutil/imgutils.h"

  40. #include "libavutil/avstring.h"

  41. 

  42. typedef struct TiffContext {

  43.     AVCodecContext *avctx;

  44.     AVFrame picture;

  45.     GetByteContext gb;

  46. 

  47.     int width, height;

  48.     unsigned int bpp, bppcount;

  49.     uint32_t palette[256];

  50.     int palette_is_set;

  51.     int le;

  52.     enum TiffCompr compr;

  53.     int invert;

  54.     int fax_opts;

  55.     int predictor;

  56.     int fill_order;

  57. 

  58.     int strips, rps, sstype;

  59.     int sot;

  60.     int stripsizesoff, stripsize, stripoff, strippos;

  61.     LZWState *lzw;

  62. 

  63.     int geotag_count;

  64.     TiffGeoTag *geotags;

  65. } TiffContext;

  66. 

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

  68. {

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

  70.     return v;

  71. }

  72. 

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

  74. {

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

  76.     return v;

  77. }

  78. 

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

  80. {

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

  82.     return i.f64;

  83. }

  84. 

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

  86. {

  87.     switch (type) {

  88.     case TIFF_BYTE : return bytestream2_get_byteu(gb);

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

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

  91.     default        : return UINT_MAX;

  92.     }

  93. }

  94. 

  95. static void free_geotags(TiffContext *const s)

  96. {

  97.     int i;

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

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

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

  101.     }

  102.     av_freep(&s->geotags);

  103. }

  104. 

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

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

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

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

  109. 

  110. static const char *get_geokey_name(int key)

  111. {

  112.     RET_GEOKEY(VERT, vert, name);

  113.     RET_GEOKEY(PROJ, proj, name);

  114.     RET_GEOKEY(GEOG, geog, name);

  115.     RET_GEOKEY(CONF, conf, name);

  116. 

  117.     return NULL;

  118. }

  119. 

  120. static int get_geokey_type(int key)

  121. {

  122.     RET_GEOKEY(VERT, vert, type);

  123.     RET_GEOKEY(PROJ, proj, type);

  124.     RET_GEOKEY(GEOG, geog, type);

  125.     RET_GEOKEY(CONF, conf, type);

  126. 

  127.     return AVERROR_INVALIDDATA;

  128. }

  129. 

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

  131. {

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

  133. }

  134. 

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

  136. {

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

  138. }

  139. 

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

  141. {

  142.     char *ap;

  143. 

  144.     if (val == TIFF_GEO_KEY_UNDEFINED)

  145.         return av_strdup("undefined");

  146.     if (val == TIFF_GEO_KEY_USER_DEFINED)

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

  148. 

  149. #define RET_GEOKEY_VAL(TYPE, array)\

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

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

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

  153. 

  154.     switch (key) {

  155.     case TIFF_GT_MODEL_TYPE_GEOKEY:

  156.         RET_GEOKEY_VAL(GT_MODEL_TYPE, gt_model_type);

  157.         break;

  158.     case TIFF_GT_RASTER_TYPE_GEOKEY:

  159.         RET_GEOKEY_VAL(GT_RASTER_TYPE, gt_raster_type);

  160.         break;

  161.     case TIFF_GEOG_LINEAR_UNITS_GEOKEY:

  162.     case TIFF_PROJ_LINEAR_UNITS_GEOKEY:

  163.     case TIFF_VERTICAL_UNITS_GEOKEY:

  164.         RET_GEOKEY_VAL(LINEAR_UNIT, linear_unit);

  165.         break;

  166.     case TIFF_GEOG_ANGULAR_UNITS_GEOKEY:

  167.     case TIFF_GEOG_AZIMUTH_UNITS_GEOKEY:

  168.         RET_GEOKEY_VAL(ANGULAR_UNIT, angular_unit);

  169.         break;

  170.     case TIFF_GEOGRAPHIC_TYPE_GEOKEY:

  171.         RET_GEOKEY_VAL(GCS_TYPE, gcs_type);

  172.         RET_GEOKEY_VAL(GCSE_TYPE, gcse_type);

  173.         break;

  174.     case TIFF_GEOG_GEODETIC_DATUM_GEOKEY:

  175.         RET_GEOKEY_VAL(GEODETIC_DATUM, geodetic_datum);

  176.         RET_GEOKEY_VAL(GEODETIC_DATUM_E, geodetic_datum_e);

  177.         break;

  178.     case TIFF_GEOG_ELLIPSOID_GEOKEY:

  179.         RET_GEOKEY_VAL(ELLIPSOID, ellipsoid);

  180.         break;

  181.     case TIFF_GEOG_PRIME_MERIDIAN_GEOKEY:

  182.         RET_GEOKEY_VAL(PRIME_MERIDIAN, prime_meridian);

  183.         break;

  184.     case TIFF_PROJECTED_CS_TYPE_GEOKEY:

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

  186.         break;

  187.     case TIFF_PROJECTION_GEOKEY:

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

  189.         break;

  190.     case TIFF_PROJ_COORD_TRANS_GEOKEY:

  191.         RET_GEOKEY_VAL(COORD_TRANS, coord_trans);

  192.         break;

  193.     case TIFF_VERTICAL_CS_TYPE_GEOKEY:

  194.         RET_GEOKEY_VAL(VERT_CS, vert_cs);

  195.         RET_GEOKEY_VAL(ORTHO_VERT_CS, ortho_vert_cs);

  196.         break;

  197. 

  198.     }

  199. 

  200.     ap = av_malloc(14);

  201.     if (ap)

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

  203.     return ap;

  204. }

  205. 

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

  207. {

  208.     int i;

  209.     char *ap, *ap0;

  210.     int component_len = 15 + strlen(sep);

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

  212.     ap = av_malloc(component_len * count);

  213.     if (!ap)

  214.         return NULL;

  215.     ap0   = ap;

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

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

  218.         unsigned l = snprintf(ap, component_len, "%f%s", dp[i], sep);

  219.         if(l >= component_len) {

  220.             av_free(ap0);

  221.             return NULL;

  222.         }

  223.         ap += l;

  224.     }

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

  226.     return ap0;

  227. }

  228. 

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

  230. {

  231.     int i;

  232.     char *ap, *ap0;

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

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

  235.     if (!ap)

  236.         return NULL;

  237.     ap0   = ap;

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

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

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

  241.         ap += l;

  242.     }

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

  244.     return ap0;

  245. }

  246. 

  247. static int add_doubles_metadata(int count,

  248.                                 const char *name, const char *sep,

  249.                                 TiffContext *s)

  250. {

  251.     char *ap;

  252.     int i;

  253.     double *dp;

  254. 

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

  256.         return AVERROR_INVALIDDATA;

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

  258.         return AVERROR_INVALIDDATA;

  259. 

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

  261.     if (!dp)

  262.         return AVERROR(ENOMEM);

  263. 

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

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

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

  267.     av_freep(&dp);

  268.     if (!ap)

  269.         return AVERROR(ENOMEM);

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

  271.     return 0;

  272. }

  273. 

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

  275.                                const char *sep, TiffContext *s)

  276. {

  277.     char *ap;

  278.     int i;

  279.     int16_t *sp;

  280. 

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

  282.         return AVERROR_INVALIDDATA;

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

  284.         return AVERROR_INVALIDDATA;

  285. 

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

  287.     if (!sp)

  288.         return AVERROR(ENOMEM);

  289. 

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

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

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

  293.     av_freep(&sp);

  294.     if (!ap)

  295.         return AVERROR(ENOMEM);

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

  297.     return 0;

  298. }

  299. 

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

  301.                                TiffContext *s)

  302. {

  303.     char *value;

  304. 

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

  306.         return AVERROR_INVALIDDATA;

  307. 

  308.     value = av_malloc(count + 1);

  309.     if (!value)

  310.         return AVERROR(ENOMEM);

  311. 

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

  313.     value[count] = 0;

  314. 

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

  316.     return 0;

  317. }

  318. 

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

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

  321. {

  322.     switch(type) {

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

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

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

  326.     default         : return AVERROR_INVALIDDATA;

  327.     };

  328. }

  329. 

  330. #if CONFIG_ZLIB

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

  332.                            int size)

  333. {

  334.     z_stream zstream = { 0 };

  335.     int zret;

  336. 

  337.     zstream.next_in = (uint8_t *)src;

  338.     zstream.avail_in = size;

  339.     zstream.next_out = dst;

  340.     zstream.avail_out = *len;

  341.     zret = inflateInit(&zstream);

  342.     if (zret != Z_OK) {

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

  344.         return zret;

  345.     }

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

  347.     inflateEnd(&zstream);

  348.     *len = zstream.total_out;

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

  350. }

  351. #endif

  352. 

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

  354.                                              int usePtr, const uint8_t *src,

  355.                                              uint8_t c, int width, int offset)

  356. {

  357.     switch (bpp) {

  358.     case 1:

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

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

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

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

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

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

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

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

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

  368.         }

  369.         break;

  370.     case 2:

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

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

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

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

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

  376.         }

  377.         break;

  378.     case 4:

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

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

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

  382.         }

  383.         break;

  384.     default:

  385.         if (usePtr) {

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

  387.         } else {

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

  389.         }

  390.     }

  391. }

  392. 

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

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

  395. {

  396.     int c, line, pixels, code;

  397.     const uint8_t *ssrc = src;

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

  399. 

  400.     if (size <= 0)

  401.         return AVERROR_INVALIDDATA;

  402. 

  403. #if CONFIG_ZLIB

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

  405.         uint8_t *zbuf;

  406.         unsigned long outlen;

  407.         int ret;

  408.         outlen = width * lines;

  409.         zbuf = av_malloc(outlen);

  410.         if (!zbuf)

  411.             return AVERROR(ENOMEM);

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

  413.         if (ret != Z_OK) {

  414.             av_log(s->avctx, AV_LOG_ERROR,

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

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

  417.             av_free(zbuf);

  418.             return -1;

  419.         }

  420.         src = zbuf;

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

  422.             if(s->bpp < 8 && s->avctx->pix_fmt == AV_PIX_FMT_PAL8){

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

  424.             }else{

  425.                 memcpy(dst, src, width);

  426.             }

  427.             dst += stride;

  428.             src += width;

  429.         }

  430.         av_free(zbuf);

  431.         return 0;

  432.     }

  433. #endif

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

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

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

  437.             return -1;

  438.         }

  439.     }

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

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

  442.         int i, ret = 0;

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

  444.                                   FF_INPUT_BUFFER_PADDING_SIZE);

  445. 

  446.         if (!src2) {

  447.             av_log(s->avctx, AV_LOG_ERROR,

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

  449.             return AVERROR(ENOMEM);

  450.         }

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

  452.             av_log(s->avctx, AV_LOG_ERROR,

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

  454.             av_free(src2);

  455.             return -1;

  456.         }

  457.         if (!s->fill_order) {

  458.             memcpy(src2, src, size);

  459.         } else {

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

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

  462.         }

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

  464.         switch (s->compr) {

  465.         case TIFF_CCITT_RLE:

  466.         case TIFF_G3:

  467.         case TIFF_G4:

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

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

  470.             break;

  471.         }

  472.         if (s->bpp < 8 && s->avctx->pix_fmt == AV_PIX_FMT_PAL8)

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

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

  475.                 dst += stride;

  476.             }

  477.         av_free(src2);

  478.         return ret;

  479.     }

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

  481.         if (src - ssrc > size) {

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

  483.             return -1;

  484.         }

  485.         switch (s->compr) {

  486.         case TIFF_RAW:

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

  488.                 return AVERROR_INVALIDDATA;

  489.             if (!s->fill_order) {

  490.                 horizontal_fill(s->bpp * (s->avctx->pix_fmt == AV_PIX_FMT_PAL8),

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

  492.             } else {

  493.                 int i;

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

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

  496.             }

  497.             src += width;

  498.             break;

  499.         case TIFF_PACKBITS:

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

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

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

  503.                     return AVERROR_INVALIDDATA;

  504.                 }

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

  506.                 if (code >= 0) {

  507.                     code++;

  508.                     if (pixels + code > width) {

  509.                         av_log(s->avctx, AV_LOG_ERROR,

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

  511.                         return -1;

  512.                     }

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

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

  515.                         return AVERROR_INVALIDDATA;

  516.                     }

  517.                     horizontal_fill(s->bpp * (s->avctx->pix_fmt == AV_PIX_FMT_PAL8),

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

  519.                     src += code;

  520.                     pixels += code;

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

  522.                     code = (-code) + 1;

  523.                     if (pixels + code > width) {

  524.                         av_log(s->avctx, AV_LOG_ERROR,

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

  526.                         return -1;

  527.                     }

  528.                     c = *src++;

  529.                     horizontal_fill(s->bpp * (s->avctx->pix_fmt == AV_PIX_FMT_PAL8),

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

  531.                     pixels += code;

  532.                 }

  533.             }

  534.             break;

  535.         case TIFF_LZW:

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

  537.             if (pixels < width) {

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

  539.                        pixels, width);

  540.                 return -1;

  541.             }

  542.             if (s->bpp < 8 && s->avctx->pix_fmt == AV_PIX_FMT_PAL8)

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

  544.             break;

  545.         }

  546.         dst += stride;

  547.     }

  548.     return 0;

  549. }

  550. 

  551. static int init_image(TiffContext *s)

  552. {

  553.     int i, ret;

  554.     uint32_t *pal;

  555. 

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

  557.     case 11:

  558.         if (!s->palette_is_set) {

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

  560.             break;

  561.         }

  562.     case 21:

  563.     case 41:

  564.     case 81:

  565.         s->avctx->pix_fmt = AV_PIX_FMT_PAL8;

  566.         break;

  567.     case 243:

  568.         s->avctx->pix_fmt = AV_PIX_FMT_RGB24;

  569.         break;

  570.     case 161:

  571.         s->avctx->pix_fmt = s->le ? AV_PIX_FMT_GRAY16LE : AV_PIX_FMT_GRAY16BE;

  572.         break;

  573.     case 162:

  574.         s->avctx->pix_fmt = AV_PIX_FMT_GRAY8A;

  575.         break;

  576.     case 324:

  577.         s->avctx->pix_fmt = AV_PIX_FMT_RGBA;

  578.         break;

  579.     case 483:

  580.         s->avctx->pix_fmt = s->le ? AV_PIX_FMT_RGB48LE : AV_PIX_FMT_RGB48BE;

  581.         break;

  582.     case 644:

  583.         s->avctx->pix_fmt = s->le ? AV_PIX_FMT_RGBA64LE : AV_PIX_FMT_RGBA64BE;

  584.         break;

  585.     default:

  586.         av_log(s->avctx, AV_LOG_ERROR,

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

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

  589.         return AVERROR_INVALIDDATA;

  590.     }

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

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

  593.             return ret;

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

  595.     }

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

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

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

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

  600.         return ret;

  601.     }

  602.     if (s->avctx->pix_fmt == AV_PIX_FMT_PAL8) {

  603.         if (s->palette_is_set) {

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

  605.         } else {

  606.             /* make default grayscale pal */

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

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

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

  610.         }

  611.     }

  612.     return 0;

  613. }

  614. 

  615. static int tiff_decode_tag(TiffContext *s)

  616. {

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

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

  619.     int ret;

  620.     uint32_t *pal;

  621.     double *dp;

  622. 

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

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

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

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

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

  628. 

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

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

  631.                type);

  632.         return 0;

  633.     }

  634. 

  635.     if (count == 1) {

  636.         switch (type) {

  637.         case TIFF_BYTE:

  638.         case TIFF_SHORT:

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

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

  641.             break;

  642.         case TIFF_LONG:

  643.             value = off;

  644.             break;

  645.         case TIFF_STRING:

  646.             if (count <= 4) {

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

  648.                 break;

  649.             }

  650.         default:

  651.             value = UINT_MAX;

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

  653.         }

  654.     } else {

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

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

  657.         } else {

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

  659.         }

  660.     }

  661. 

  662.     switch (tag) {

  663.     case TIFF_WIDTH:

  664.         s->width = value;

  665.         break;

  666.     case TIFF_HEIGHT:

  667.         s->height = value;

  668.         break;

  669.     case TIFF_BPP:

  670.         s->bppcount = count;

  671.         if (count > 4) {

  672.             av_log(s->avctx, AV_LOG_ERROR,

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

  674.                    s->bpp, count);

  675.             return -1;

  676.         }

  677.         if (count == 1)

  678.             s->bpp = value;

  679.         else {

  680.             switch (type) {

  681.             case TIFF_BYTE:

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

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

  684.                 break;

  685.             case TIFF_SHORT:

  686.             case TIFF_LONG:

  687.                 s->bpp = 0;

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

  689.                     return -1;

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

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

  692.                 break;

  693.             default:

  694.                 s->bpp = -1;

  695.             }

  696.         }

  697.         break;

  698.     case TIFF_SAMPLES_PER_PIXEL:

  699.         if (count != 1) {

  700.             av_log(s->avctx, AV_LOG_ERROR,

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

  702.             return AVERROR_INVALIDDATA;

  703.         }

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

  705.             s->bpp *= value;

  706.         s->bppcount = value;

  707.         break;

  708.     case TIFF_COMPR:

  709.         s->compr = value;

  710.         s->predictor = 0;

  711.         switch (s->compr) {

  712.         case TIFF_RAW:

  713.         case TIFF_PACKBITS:

  714.         case TIFF_LZW:

  715.         case TIFF_CCITT_RLE:

  716.             break;

  717.         case TIFF_G3:

  718.         case TIFF_G4:

  719.             s->fax_opts = 0;

  720.             break;

  721.         case TIFF_DEFLATE:

  722.         case TIFF_ADOBE_DEFLATE:

  723. #if CONFIG_ZLIB

  724.             break;

  725. #else

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

  727.             return -1;

  728. #endif

  729.         case TIFF_JPEG:

  730.         case TIFF_NEWJPEG:

  731.             av_log(s->avctx, AV_LOG_ERROR,

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

  733.             return -1;

  734.         default:

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

  736.                    s->compr);

  737.             return -1;

  738.         }

  739.         break;

  740.     case TIFF_ROWSPERSTRIP:

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

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

  743.         if (value < 1) {

  744.             av_log(s->avctx, AV_LOG_ERROR,

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

  746.             return -1;

  747.         }

  748.         s->rps = value;

  749.         break;

  750.     case TIFF_STRIP_OFFS:

  751.         if (count == 1) {

  752.             s->strippos = 0;

  753.             s->stripoff = value;

  754.         } else

  755.             s->strippos = off;

  756.         s->strips = count;

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

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

  759.         s->sot = type;

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

  761.             av_log(s->avctx, AV_LOG_ERROR,

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

  763.             return -1;

  764.         }

  765.         break;

  766.     case TIFF_STRIP_SIZE:

  767.         if (count == 1) {

  768.             s->stripsizesoff = 0;

  769.             s->stripsize = value;

  770.             s->strips = 1;

  771.         } else {

  772.             s->stripsizesoff = off;

  773.         }

  774.         s->strips = count;

  775.         s->sstype = type;

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

  777.             av_log(s->avctx, AV_LOG_ERROR,

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

  779.             return -1;

  780.         }

  781.         break;

  782.     case TIFF_TILE_BYTE_COUNTS:

  783.     case TIFF_TILE_LENGTH:

  784.     case TIFF_TILE_OFFSETS:

  785.     case TIFF_TILE_WIDTH:

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

  787.         return AVERROR_PATCHWELCOME;

  788.         break;

  789.     case TIFF_PREDICTOR:

  790.         s->predictor = value;

  791.         break;

  792.     case TIFF_INVERT:

  793.         switch (value) {

  794.         case 0:

  795.             s->invert = 1;

  796.             break;

  797.         case 1:

  798.             s->invert = 0;

  799.             break;

  800.         case 2:

  801.         case 3:

  802.             break;

  803.         default:

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

  805.                    value);

  806.             return -1;

  807.         }

  808.         break;

  809.     case TIFF_FILL_ORDER:

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

  811.             av_log(s->avctx, AV_LOG_ERROR,

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

  813.             value = 1;

  814.         }

  815.         s->fill_order = value - 1;

  816.         break;

  817.     case TIFF_PAL:

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

  819.         off = type_sizes[type];

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

  821.             return -1;

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

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

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

  825.                 if (k == 2)

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

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

  828.                 pal[i] |= j;

  829.             }

  830.         }

  831.         s->palette_is_set = 1;

  832.         break;

  833.     case TIFF_PLANAR:

  834.         if (value == 2) {

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

  836.             return -1;

  837.         }

  838.         break;

  839.     case TIFF_T4OPTIONS:

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

  841.             s->fax_opts = value;

  842.         break;

  843.     case TIFF_T6OPTIONS:

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

  845.             s->fax_opts = value;

  846.         break;

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

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

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

  850.         return ret;\

  851.     }

  852.     case TIFF_MODEL_PIXEL_SCALE:

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

  854.         break;

  855.     case TIFF_MODEL_TRANSFORMATION:

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

  857.         break;

  858.     case TIFF_MODEL_TIEPOINT:

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

  860.         break;

  861.     case TIFF_GEO_KEY_DIRECTORY:

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

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

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

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

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

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

  868.         }

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

  870.             return -1;

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

  872.         if (!s->geotags) {

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

  874.             return AVERROR(ENOMEM);

  875.         }

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

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

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

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

  880. 

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

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

  883.             else

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

  885.         }

  886.         break;

  887.     case TIFF_GEO_DOUBLE_PARAMS:

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

  889.             return AVERROR_INVALIDDATA;

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

  891.             return AVERROR_INVALIDDATA;

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

  893.         if (!dp) {

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

  895.             return AVERROR(ENOMEM);

  896.         }

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

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

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

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

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

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

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

  904.                 } else {

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

  906.                     if (!ap) {

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

  908.                         av_freep(&dp);

  909.                         return AVERROR(ENOMEM);

  910.                     }

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

  912.                 }

  913.             }

  914.         }

  915.         av_freep(&dp);

  916.         break;

  917.     case TIFF_GEO_ASCII_PARAMS:

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

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

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

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

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

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

  924.                 } else {

  925.                     char *ap;

  926. 

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

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

  929.                         return -1;

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

  931.                     if (!ap) {

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

  933.                         return AVERROR(ENOMEM);

  934.                     }

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

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

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

  938.                 }

  939.             }

  940.         }

  941.         break;

  942.     case TIFF_ARTIST:

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

  944.         break;

  945.     case TIFF_COPYRIGHT:

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

  947.         break;

  948.     case TIFF_DATE:

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

  950.         break;

  951.     case TIFF_DOCUMENT_NAME:

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

  953.         break;

  954.     case TIFF_HOST_COMPUTER:

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

  956.         break;

  957.     case TIFF_IMAGE_DESCRIPTION:

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

  959.         break;

  960.     case TIFF_MAKE:

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

  962.         break;

  963.     case TIFF_MODEL:

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

  965.         break;

  966.     case TIFF_PAGE_NAME:

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

  968.         break;

  969.     case TIFF_PAGE_NUMBER:

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

  971.         break;

  972.     case TIFF_SOFTWARE_NAME:

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

  974.         break;

  975.     default:

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

  977.                tag, tag);

  978.     }

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

  980.     return 0;

  981. }

  982. 

  983. static int decode_frame(AVCodecContext *avctx,

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

  985. {

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

  987.     AVFrame *picture = data;

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

  989.     unsigned off;

  990.     int id, le, ret;

  991.     int i, j, entries;

  992.     int stride;

  993.     unsigned soff, ssize;

  994.     uint8_t *dst;

  995.     GetByteContext stripsizes;

  996.     GetByteContext stripdata;

  997. 

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

  999. 

  1000.     //parse image header

  1001.     if (avpkt->size < 8)

  1002.         return AVERROR_INVALIDDATA;

  1003.     id = bytestream2_get_le16u(&s->gb);

  1004.     if (id == 0x4949)

  1005.         le = 1;

  1006.     else if (id == 0x4D4D)

  1007.         le = 0;

  1008.     else {

  1009.         av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");

  1010.         return -1;

  1011.     }

  1012.     s->le = le;

  1013.     // TIFF_BPP is not a required tag and defaults to 1

  1014.     s->bppcount = s->bpp = 1;

  1015.     s->invert = 0;

  1016.     s->compr = TIFF_RAW;

  1017.     s->fill_order = 0;

  1018.     free_geotags(s);

  1019.     /* free existing metadata */

  1020.     av_dict_free(&s->picture.metadata);

  1021. 

  1022.     // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number

  1023.     // that further identifies the file as a TIFF file"

  1024.     if (tget_short(&s->gb, le) != 42) {

  1025.         av_log(avctx, AV_LOG_ERROR,

  1026.                "The answer to life, universe and everything is not correct!\n");

  1027.         return -1;

  1028.     }

  1029.     // Reset these offsets so we can tell if they were set this frame

  1030.     s->stripsizesoff = s->strippos = 0;

  1031.     /* parse image file directory */

  1032.     off = tget_long(&s->gb, le);

  1033.     if (off >= UINT_MAX - 14 || avpkt->size < off + 14) {

  1034.         av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");

  1035.         return AVERROR_INVALIDDATA;

  1036.     }

  1037.     bytestream2_seek(&s->gb, off, SEEK_SET);

  1038.     entries = tget_short(&s->gb, le);

  1039.     if (bytestream2_get_bytes_left(&s->gb) < entries * 12)

  1040.         return AVERROR_INVALIDDATA;

  1041.     for (i = 0; i < entries; i++) {

  1042.         if (tiff_decode_tag(s) < 0)

  1043.             return -1;

  1044.     }

  1045. 

  1046.     for (i = 0; i<s->geotag_count; i++) {

  1047.         const char *keyname = get_geokey_name(s->geotags[i].key);

  1048.         if (!keyname) {

  1049.             av_log(avctx, AV_LOG_WARNING, "Unknown or unsupported GeoTIFF key %d\n", s->geotags[i].key);

  1050.             continue;

  1051.         }

  1052.         if (get_geokey_type(s->geotags[i].key) != s->geotags[i].type) {

  1053.             av_log(avctx, AV_LOG_WARNING, "Type of GeoTIFF key %d is wrong\n", s->geotags[i].key);

  1054.             continue;

  1055.         }

  1056.         ret = av_dict_set(&s->picture.metadata, keyname, s->geotags[i].val, 0);

  1057.         if (ret<0) {

  1058.             av_log(avctx, AV_LOG_ERROR, "Writing metadata with key '%s' failed\n", keyname);

  1059.             return ret;

  1060.         }

  1061.     }

  1062. 

  1063.     if (!s->strippos && !s->stripoff) {

  1064.         av_log(avctx, AV_LOG_ERROR, "Image data is missing\n");

  1065.         return -1;

  1066.     }

  1067.     /* now we have the data and may start decoding */

  1068.     if ((ret = init_image(s)) < 0)

  1069.         return ret;

  1070. 

  1071.     if (s->strips == 1 && !s->stripsize) {

  1072.         av_log(avctx, AV_LOG_WARNING, "Image data size missing\n");

  1073.         s->stripsize = avpkt->size - s->stripoff;

  1074.     }

  1075.     stride = p->linesize[0];

  1076.     dst = p->data[0];

  1077. 

  1078.     if (s->stripsizesoff) {

  1079.         if (s->stripsizesoff >= avpkt->size)

  1080.             return AVERROR_INVALIDDATA;

  1081.         bytestream2_init(&stripsizes, avpkt->data + s->stripsizesoff, avpkt->size - s->stripsizesoff);

  1082.     }

  1083.     if (s->strippos) {

  1084.         if (s->strippos >= avpkt->size)

  1085.             return AVERROR_INVALIDDATA;

  1086.         bytestream2_init(&stripdata, avpkt->data + s->strippos, avpkt->size - s->strippos);

  1087.     }

  1088. 

  1089.     for (i = 0; i < s->height; i += s->rps) {

  1090.         if (s->stripsizesoff)

  1091.             ssize = tget(&stripsizes, s->sstype, s->le);

  1092.         else

  1093.             ssize = s->stripsize;

  1094. 

  1095.         if (s->strippos)

  1096.             soff = tget(&stripdata, s->sot, s->le);

  1097.         else

  1098.             soff = s->stripoff;

  1099. 

  1100.         if (soff > avpkt->size || ssize > avpkt->size - soff) {

  1101.             av_log(avctx, AV_LOG_ERROR, "Invalid strip size/offset\n");

  1102.             return -1;

  1103.         }

  1104.         if (tiff_unpack_strip(s, dst, stride, avpkt->data + soff, ssize,

  1105.                               FFMIN(s->rps, s->height - i)) < 0)

  1106.             break;

  1107.         dst += s->rps * stride;

  1108.     }

  1109.     if (s->predictor == 2) {

  1110.         dst = p->data[0];

  1111.         soff = s->bpp >> 3;

  1112.         ssize = s->width * soff;

  1113.         if (s->avctx->pix_fmt == AV_PIX_FMT_RGB48LE ||

  1114.             s->avctx->pix_fmt == AV_PIX_FMT_RGBA64LE) {

  1115.             for (i = 0; i < s->height; i++) {

  1116.                 for (j = soff; j < ssize; j += 2)

  1117.                     AV_WL16(dst + j, AV_RL16(dst + j) + AV_RL16(dst + j - soff));

  1118.                 dst += stride;

  1119.             }

  1120.         } else if (s->avctx->pix_fmt == AV_PIX_FMT_RGB48BE ||

  1121.                    s->avctx->pix_fmt == AV_PIX_FMT_RGBA64BE) {

  1122.             for (i = 0; i < s->height; i++) {

  1123.                 for (j = soff; j < ssize; j += 2)

  1124.                     AV_WB16(dst + j, AV_RB16(dst + j) + AV_RB16(dst + j - soff));

  1125.                 dst += stride;

  1126.             }

  1127.         } else {

  1128.             for (i = 0; i < s->height; i++) {

  1129.                 for (j = soff; j < ssize; j++)

  1130.                     dst[j] += dst[j - soff];

  1131.                 dst += stride;

  1132.             }

  1133.         }

  1134.     }

  1135. 

  1136.     if (s->invert) {

  1137.         dst = s->picture.data[0];

  1138.         for (i = 0; i < s->height; i++) {

  1139.             for (j = 0; j < s->picture.linesize[0]; j++)

  1140.                 dst[j] = (s->avctx->pix_fmt == AV_PIX_FMT_PAL8 ? (1<<s->bpp) - 1 : 255) - dst[j];

  1141.             dst += s->picture.linesize[0];

  1142.         }

  1143.     }

  1144.     *picture   = s->picture;

  1145.     *data_size = sizeof(AVPicture);

  1146. 

  1147.     return avpkt->size;

  1148. }

  1149. 

  1150. static av_cold int tiff_init(AVCodecContext *avctx)

  1151. {

  1152.     TiffContext *s = avctx->priv_data;

  1153. 

  1154.     s->width = 0;

  1155.     s->height = 0;

  1156.     s->avctx = avctx;

  1157.     avcodec_get_frame_defaults(&s->picture);

  1158.     avctx->coded_frame = &s->picture;

  1159.     ff_lzw_decode_open(&s->lzw);

  1160.     ff_ccitt_unpack_init();

  1161. 

  1162.     return 0;

  1163. }

  1164. 

  1165. static av_cold int tiff_end(AVCodecContext *avctx)

  1166. {

  1167.     TiffContext *const s = avctx->priv_data;

  1168. 

  1169.     free_geotags(s);

  1170.     if (avctx->coded_frame && avctx->coded_frame->metadata)

  1171.         av_dict_free(&avctx->coded_frame->metadata);

  1172. 

  1173.     ff_lzw_decode_close(&s->lzw);

  1174.     if (s->picture.data[0])

  1175.         avctx->release_buffer(avctx, &s->picture);

  1176.     return 0;

  1177. }

  1178. 

  1179. AVCodec ff_tiff_decoder = {

  1180.     .name           = "tiff",

  1181.     .type           = AVMEDIA_TYPE_VIDEO,

  1182.     .id             = AV_CODEC_ID_TIFF,

  1183.     .priv_data_size = sizeof(TiffContext),

  1184.     .init           = tiff_init,

  1185.     .close          = tiff_end,

  1186.     .decode         = decode_frame,

  1187.     .capabilities   = CODEC_CAP_DR1,

  1188.     .long_name      = NULL_IF_CONFIG_SMALL("TIFF image"),

  1189. };