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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 "mathops.h"

  38. #include "libavutil/attributes.h"

  39. #include "libavutil/intreadwrite.h"

  40. #include "libavutil/imgutils.h"

  41. #include "libavutil/avstring.h"

  42. 

  43. typedef struct TiffContext {

  44.     AVCodecContext *avctx;

  45.     AVFrame picture;

  46.     GetByteContext gb;

  47. 

  48.     int width, height;

  49.     unsigned int bpp, bppcount;

  50.     uint32_t palette[256];

  51.     int palette_is_set;

  52.     int le;

  53.     enum TiffCompr compr;

  54.     int invert;

  55.     int fax_opts;

  56.     int predictor;

  57.     int fill_order;

  58. 

  59.     int strips, rps, sstype;

  60.     int sot;

  61.     int stripsizesoff, stripsize, stripoff, strippos;

  62.     LZWState *lzw;

  63. 

  64.     int geotag_count;

  65.     TiffGeoTag *geotags;

  66. } TiffContext;

  67. 

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

  69. {

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

  71.     return v;

  72. }

  73. 

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

  75. {

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

  77.     return v;

  78. }

  79. 

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

  81. {

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

  83.     return i.f64;

  84. }

  85. 

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

  87. {

  88.     switch (type) {

  89.     case TIFF_BYTE : return bytestream2_get_byteu(gb);

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

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

  92.     default        : return UINT_MAX;

  93.     }

  94. }

  95. 

  96. static void free_geotags(TiffContext *const s)

  97. {

  98.     int i;

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

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

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

  102.     }

  103.     av_freep(&s->geotags);

  104. }

  105. 

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

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

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

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

  110. 

  111. static const char *get_geokey_name(int key)

  112. {

  113.     RET_GEOKEY(VERT, vert, name);

  114.     RET_GEOKEY(PROJ, proj, name);

  115.     RET_GEOKEY(GEOG, geog, name);

  116.     RET_GEOKEY(CONF, conf, name);

  117. 

  118.     return NULL;

  119. }

  120. 

  121. static int get_geokey_type(int key)

  122. {

  123.     RET_GEOKEY(VERT, vert, type);

  124.     RET_GEOKEY(PROJ, proj, type);

  125.     RET_GEOKEY(GEOG, geog, type);

  126.     RET_GEOKEY(CONF, conf, type);

  127. 

  128.     return AVERROR_INVALIDDATA;

  129. }

  130. 

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

  132. {

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

  134. }

  135. 

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

  137. {

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

  139. }

  140. 

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

  142. {

  143.     char *ap;

  144. 

  145.     if (val == TIFF_GEO_KEY_UNDEFINED)

  146.         return av_strdup("undefined");

  147.     if (val == TIFF_GEO_KEY_USER_DEFINED)

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

  149. 

  150. #define RET_GEOKEY_VAL(TYPE, array)\

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

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

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

  154. 

  155.     switch (key) {

  156.     case TIFF_GT_MODEL_TYPE_GEOKEY:

  157.         RET_GEOKEY_VAL(GT_MODEL_TYPE, gt_model_type);

  158.         break;

  159.     case TIFF_GT_RASTER_TYPE_GEOKEY:

  160.         RET_GEOKEY_VAL(GT_RASTER_TYPE, gt_raster_type);

  161.         break;

  162.     case TIFF_GEOG_LINEAR_UNITS_GEOKEY:

  163.     case TIFF_PROJ_LINEAR_UNITS_GEOKEY:

  164.     case TIFF_VERTICAL_UNITS_GEOKEY:

  165.         RET_GEOKEY_VAL(LINEAR_UNIT, linear_unit);

  166.         break;

  167.     case TIFF_GEOG_ANGULAR_UNITS_GEOKEY:

  168.     case TIFF_GEOG_AZIMUTH_UNITS_GEOKEY:

  169.         RET_GEOKEY_VAL(ANGULAR_UNIT, angular_unit);

  170.         break;

  171.     case TIFF_GEOGRAPHIC_TYPE_GEOKEY:

  172.         RET_GEOKEY_VAL(GCS_TYPE, gcs_type);

  173.         RET_GEOKEY_VAL(GCSE_TYPE, gcse_type);

  174.         break;

  175.     case TIFF_GEOG_GEODETIC_DATUM_GEOKEY:

  176.         RET_GEOKEY_VAL(GEODETIC_DATUM, geodetic_datum);

  177.         RET_GEOKEY_VAL(GEODETIC_DATUM_E, geodetic_datum_e);

  178.         break;

  179.     case TIFF_GEOG_ELLIPSOID_GEOKEY:

  180.         RET_GEOKEY_VAL(ELLIPSOID, ellipsoid);

  181.         break;

  182.     case TIFF_GEOG_PRIME_MERIDIAN_GEOKEY:

  183.         RET_GEOKEY_VAL(PRIME_MERIDIAN, prime_meridian);

  184.         break;

  185.     case TIFF_PROJECTED_CS_TYPE_GEOKEY:

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

  187.         break;

  188.     case TIFF_PROJECTION_GEOKEY:

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

  190.         break;

  191.     case TIFF_PROJ_COORD_TRANS_GEOKEY:

  192.         RET_GEOKEY_VAL(COORD_TRANS, coord_trans);

  193.         break;

  194.     case TIFF_VERTICAL_CS_TYPE_GEOKEY:

  195.         RET_GEOKEY_VAL(VERT_CS, vert_cs);

  196.         RET_GEOKEY_VAL(ORTHO_VERT_CS, ortho_vert_cs);

  197.         break;

  198. 

  199.     }

  200. 

  201.     ap = av_malloc(14);

  202.     if (ap)

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

  204.     return ap;

  205. }

  206. 

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

  208. {

  209.     int i;

  210.     char *ap, *ap0;

  211.     int component_len;

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

  213.     component_len = 15 + strlen(sep);

  214.     ap = av_malloc(component_len * count);

  215.     if (!ap)

  216.         return NULL;

  217.     ap0   = ap;

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

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

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

  221.         if(l >= component_len) {

  222.             av_free(ap0);

  223.             return NULL;

  224.         }

  225.         ap += l;

  226.     }

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

  228.     return ap0;

  229. }

  230. 

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

  232. {

  233.     int i;

  234.     char *ap, *ap0;

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

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

  237.     if (!ap)

  238.         return NULL;

  239.     ap0   = ap;

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

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

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

  243.         ap += l;

  244.     }

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

  246.     return ap0;

  247. }

  248. 

  249. static int add_doubles_metadata(int count,

  250.                                 const char *name, const char *sep,

  251.                                 TiffContext *s)

  252. {

  253.     char *ap;

  254.     int i;

  255.     double *dp;

  256. 

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

  258.         return AVERROR_INVALIDDATA;

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

  260.         return AVERROR_INVALIDDATA;

  261. 

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

  263.     if (!dp)

  264.         return AVERROR(ENOMEM);

  265. 

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

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

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

  269.     av_freep(&dp);

  270.     if (!ap)

  271.         return AVERROR(ENOMEM);

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

  273.     return 0;

  274. }

  275. 

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

  277.                                const char *sep, TiffContext *s)

  278. {

  279.     char *ap;

  280.     int i;

  281.     int16_t *sp;

  282. 

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

  284.         return AVERROR_INVALIDDATA;

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

  286.         return AVERROR_INVALIDDATA;

  287. 

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

  289.     if (!sp)

  290.         return AVERROR(ENOMEM);

  291. 

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

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

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

  295.     av_freep(&sp);

  296.     if (!ap)

  297.         return AVERROR(ENOMEM);

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

  299.     return 0;

  300. }

  301. 

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

  303.                                TiffContext *s)

  304. {

  305.     char *value;

  306. 

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

  308.         return AVERROR_INVALIDDATA;

  309. 

  310.     value = av_malloc(count + 1);

  311.     if (!value)

  312.         return AVERROR(ENOMEM);

  313. 

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

  315.     value[count] = 0;

  316. 

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

  318.     return 0;

  319. }

  320. 

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

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

  323. {

  324.     switch(type) {

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

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

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

  328.     default         : return AVERROR_INVALIDDATA;

  329.     };

  330. }

  331. 

  332. #if CONFIG_ZLIB

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

  334.                            int size)

  335. {

  336.     z_stream zstream = { 0 };

  337.     int zret;

  338. 

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

  340.     zstream.avail_in = size;

  341.     zstream.next_out = dst;

  342.     zstream.avail_out = *len;

  343.     zret = inflateInit(&zstream);

  344.     if (zret != Z_OK) {

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

  346.         return zret;

  347.     }

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

  349.     inflateEnd(&zstream);

  350.     *len = zstream.total_out;

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

  352. }

  353. #endif

  354. 

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

  356.                                              int usePtr, const uint8_t *src,

  357.                                              uint8_t c, int width, int offset)

  358. {

  359.     switch (bpp) {

  360.     case 1:

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

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

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

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

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

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

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

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

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

  370.         }

  371.         break;

  372.     case 2:

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

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

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

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

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

  378.         }

  379.         break;

  380.     case 4:

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

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

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

  384.         }

  385.         break;

  386.     default:

  387.         if (usePtr) {

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

  389.         } else {

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

  391.         }

  392.     }

  393. }

  394. 

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

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

  397. {

  398.     int c, line, pixels, code;

  399.     const uint8_t *ssrc = src;

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

  401. 

  402.     if (size <= 0)

  403.         return AVERROR_INVALIDDATA;

  404. 

  405. #if CONFIG_ZLIB

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

  407.         uint8_t *zbuf;

  408.         unsigned long outlen;

  409.         int ret;

  410.         outlen = width * lines;

  411.         zbuf = av_malloc(outlen);

  412.         if (!zbuf)

  413.             return AVERROR(ENOMEM);

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

  415.         if (ret != Z_OK) {

  416.             av_log(s->avctx, AV_LOG_ERROR,

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

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

  419.             av_free(zbuf);

  420.             return -1;

  421.         }

  422.         src = zbuf;

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

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

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

  426.             }else{

  427.                 memcpy(dst, src, width);

  428.             }

  429.             dst += stride;

  430.             src += width;

  431.         }

  432.         av_free(zbuf);

  433.         return 0;

  434.     }

  435. #endif

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

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

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

  439.             return -1;

  440.         }

  441.     }

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

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

  444.         int i, ret = 0;

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

  446.                                   FF_INPUT_BUFFER_PADDING_SIZE);

  447. 

  448.         if (!src2) {

  449.             av_log(s->avctx, AV_LOG_ERROR,

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

  451.             return AVERROR(ENOMEM);

  452.         }

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

  454.             av_log(s->avctx, AV_LOG_ERROR,

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

  456.             av_free(src2);

  457.             return -1;

  458.         }

  459.         if (!s->fill_order) {

  460.             memcpy(src2, src, size);

  461.         } else {

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

  463.                 src2[i] = ff_reverse[src[i]];

  464.         }

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

  466.         switch (s->compr) {

  467.         case TIFF_CCITT_RLE:

  468.         case TIFF_G3:

  469.         case TIFF_G4:

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

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

  472.             break;

  473.         }

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

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

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

  477.                 dst += stride;

  478.             }

  479.         av_free(src2);

  480.         return ret;

  481.     }

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

  483.         if (src - ssrc > size) {

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

  485.             return -1;

  486.         }

  487.         switch (s->compr) {

  488.         case TIFF_RAW:

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

  490.                 return AVERROR_INVALIDDATA;

  491.             if (!s->fill_order) {

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

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

  494.             } else {

  495.                 int i;

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

  497.                     dst[i] = ff_reverse[src[i]];

  498.             }

  499.             src += width;

  500.             break;

  501.         case TIFF_PACKBITS:

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

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

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

  505.                     return AVERROR_INVALIDDATA;

  506.                 }

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

  508.                 if (code >= 0) {

  509.                     code++;

  510.                     if (pixels + code > width) {

  511.                         av_log(s->avctx, AV_LOG_ERROR,

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

  513.                         return -1;

  514.                     }

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

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

  517.                         return AVERROR_INVALIDDATA;

  518.                     }

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

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

  521.                     src += code;

  522.                     pixels += code;

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

  524.                     code = (-code) + 1;

  525.                     if (pixels + code > width) {

  526.                         av_log(s->avctx, AV_LOG_ERROR,

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

  528.                         return -1;

  529.                     }

  530.                     c = *src++;

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

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

  533.                     pixels += code;

  534.                 }

  535.             }

  536.             break;

  537.         case TIFF_LZW:

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

  539.             if (pixels < width) {

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

  541.                        pixels, width);

  542.                 return -1;

  543.             }

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

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

  546.             break;

  547.         }

  548.         dst += stride;

  549.     }

  550.     return 0;

  551. }

  552. 

  553. static int init_image(TiffContext *s)

  554. {

  555.     int i, ret;

  556.     uint32_t *pal;

  557. 

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

  559.     case 11:

  560.         if (!s->palette_is_set) {

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

  562.             break;

  563.         }

  564.     case 21:

  565.     case 41:

  566.     case 81:

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

  568.         break;

  569.     case 243:

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

  571.         break;

  572.     case 161:

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

  574.         break;

  575.     case 162:

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

  577.         break;

  578.     case 324:

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

  580.         break;

  581.     case 483:

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

  583.         break;

  584.     case 644:

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

  586.         break;

  587.     default:

  588.         av_log(s->avctx, AV_LOG_ERROR,

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

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

  591.         return AVERROR_INVALIDDATA;

  592.     }

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

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

  595.             return ret;

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

  597.     }

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

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

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

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

  602.         return ret;

  603.     }

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

  605.         if (s->palette_is_set) {

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

  607.         } else {

  608.             /* make default grayscale pal */

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

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

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

  612.         }

  613.     }

  614.     return 0;

  615. }

  616. 

  617. static int tiff_decode_tag(TiffContext *s)

  618. {

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

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

  621.     int ret;

  622.     uint32_t *pal;

  623.     double *dp;

  624. 

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

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

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

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

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

  630. 

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

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

  633.                type);

  634.         return 0;

  635.     }

  636. 

  637.     if (count == 1) {

  638.         switch (type) {

  639.         case TIFF_BYTE:

  640.         case TIFF_SHORT:

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

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

  643.             break;

  644.         case TIFF_LONG:

  645.             value = off;

  646.             break;

  647.         case TIFF_STRING:

  648.             if (count <= 4) {

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

  650.                 break;

  651.             }

  652.         default:

  653.             value = UINT_MAX;

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

  655.         }

  656.     } else {

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

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

  659.         } else {

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

  661.         }

  662.     }

  663. 

  664.     switch (tag) {

  665.     case TIFF_WIDTH:

  666.         s->width = value;

  667.         break;

  668.     case TIFF_HEIGHT:

  669.         s->height = value;

  670.         break;

  671.     case TIFF_BPP:

  672.         s->bppcount = count;

  673.         if (count > 4) {

  674.             av_log(s->avctx, AV_LOG_ERROR,

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

  676.                    s->bpp, count);

  677.             return -1;

  678.         }

  679.         if (count == 1)

  680.             s->bpp = value;

  681.         else {

  682.             switch (type) {

  683.             case TIFF_BYTE:

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

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

  686.                 break;

  687.             case TIFF_SHORT:

  688.             case TIFF_LONG:

  689.                 s->bpp = 0;

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

  691.                     return -1;

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

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

  694.                 break;

  695.             default:

  696.                 s->bpp = -1;

  697.             }

  698.         }

  699.         break;

  700.     case TIFF_SAMPLES_PER_PIXEL:

  701.         if (count != 1) {

  702.             av_log(s->avctx, AV_LOG_ERROR,

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

  704.             return AVERROR_INVALIDDATA;

  705.         }

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

  707.             s->bpp *= value;

  708.         s->bppcount = value;

  709.         break;

  710.     case TIFF_COMPR:

  711.         s->compr = value;

  712.         s->predictor = 0;

  713.         switch (s->compr) {

  714.         case TIFF_RAW:

  715.         case TIFF_PACKBITS:

  716.         case TIFF_LZW:

  717.         case TIFF_CCITT_RLE:

  718.             break;

  719.         case TIFF_G3:

  720.         case TIFF_G4:

  721.             s->fax_opts = 0;

  722.             break;

  723.         case TIFF_DEFLATE:

  724.         case TIFF_ADOBE_DEFLATE:

  725. #if CONFIG_ZLIB

  726.             break;

  727. #else

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

  729.             return -1;

  730. #endif

  731.         case TIFF_JPEG:

  732.         case TIFF_NEWJPEG:

  733.             av_log(s->avctx, AV_LOG_ERROR,

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

  735.             return -1;

  736.         default:

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

  738.                    s->compr);

  739.             return -1;

  740.         }

  741.         break;

  742.     case TIFF_ROWSPERSTRIP:

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

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

  745.         if (value < 1) {

  746.             av_log(s->avctx, AV_LOG_ERROR,

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

  748.             return -1;

  749.         }

  750.         s->rps = value;

  751.         break;

  752.     case TIFF_STRIP_OFFS:

  753.         if (count == 1) {

  754.             s->strippos = 0;

  755.             s->stripoff = value;

  756.         } else

  757.             s->strippos = off;

  758.         s->strips = count;

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

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

  761.         s->sot = type;

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

  763.             av_log(s->avctx, AV_LOG_ERROR,

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

  765.             return -1;

  766.         }

  767.         break;

  768.     case TIFF_STRIP_SIZE:

  769.         if (count == 1) {

  770.             s->stripsizesoff = 0;

  771.             s->stripsize = value;

  772.             s->strips = 1;

  773.         } else {

  774.             s->stripsizesoff = off;

  775.         }

  776.         s->strips = count;

  777.         s->sstype = type;

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

  779.             av_log(s->avctx, AV_LOG_ERROR,

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

  781.             return -1;

  782.         }

  783.         break;

  784.     case TIFF_TILE_BYTE_COUNTS:

  785.     case TIFF_TILE_LENGTH:

  786.     case TIFF_TILE_OFFSETS:

  787.     case TIFF_TILE_WIDTH:

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

  789.         return AVERROR_PATCHWELCOME;

  790.         break;

  791.     case TIFF_PREDICTOR:

  792.         s->predictor = value;

  793.         break;

  794.     case TIFF_INVERT:

  795.         switch (value) {

  796.         case 0:

  797.             s->invert = 1;

  798.             break;

  799.         case 1:

  800.             s->invert = 0;

  801.             break;

  802.         case 2:

  803.         case 3:

  804.             break;

  805.         default:

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

  807.                    value);

  808.             return -1;

  809.         }

  810.         break;

  811.     case TIFF_FILL_ORDER:

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

  813.             av_log(s->avctx, AV_LOG_ERROR,

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

  815.             value = 1;

  816.         }

  817.         s->fill_order = value - 1;

  818.         break;

  819.     case TIFF_PAL:

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

  821.         off = type_sizes[type];

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

  823.             return -1;

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

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

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

  827.                 if (k == 2)

  828.                     pal[i] = 0xFFU << 24;

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

  830.                 pal[i] |= j;

  831.             }

  832.         }

  833.         s->palette_is_set = 1;

  834.         break;

  835.     case TIFF_PLANAR:

  836.         if (value == 2) {

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

  838.             return -1;

  839.         }

  840.         break;

  841.     case TIFF_T4OPTIONS:

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

  843.             s->fax_opts = value;

  844.         break;

  845.     case TIFF_T6OPTIONS:

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

  847.             s->fax_opts = value;

  848.         break;

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

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

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

  852.         return ret;\

  853.     }

  854.     case TIFF_MODEL_PIXEL_SCALE:

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

  856.         break;

  857.     case TIFF_MODEL_TRANSFORMATION:

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

  859.         break;

  860.     case TIFF_MODEL_TIEPOINT:

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

  862.         break;

  863.     case TIFF_GEO_KEY_DIRECTORY:

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

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

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

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

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

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

  870.         }

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

  872.             return -1;

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

  874.         if (!s->geotags) {

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

  876.             return AVERROR(ENOMEM);

  877.         }

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

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

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

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

  882. 

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

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

  885.             else

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

  887.         }

  888.         break;

  889.     case TIFF_GEO_DOUBLE_PARAMS:

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

  891.             return AVERROR_INVALIDDATA;

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

  893.             return AVERROR_INVALIDDATA;

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

  895.         if (!dp) {

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

  897.             return AVERROR(ENOMEM);

  898.         }

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

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

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

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

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

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

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

  906.                 } else {

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

  908.                     if (!ap) {

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

  910.                         av_freep(&dp);

  911.                         return AVERROR(ENOMEM);

  912.                     }

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

  914.                 }

  915.             }

  916.         }

  917.         av_freep(&dp);

  918.         break;

  919.     case TIFF_GEO_ASCII_PARAMS:

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

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

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

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

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

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

  926.                 } else {

  927.                     char *ap;

  928. 

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

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

  931.                         return -1;

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

  933.                     if (!ap) {

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

  935.                         return AVERROR(ENOMEM);

  936.                     }

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

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

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

  940.                 }

  941.             }

  942.         }

  943.         break;

  944.     case TIFF_ARTIST:

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

  946.         break;

  947.     case TIFF_COPYRIGHT:

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

  949.         break;

  950.     case TIFF_DATE:

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

  952.         break;

  953.     case TIFF_DOCUMENT_NAME:

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

  955.         break;

  956.     case TIFF_HOST_COMPUTER:

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

  958.         break;

  959.     case TIFF_IMAGE_DESCRIPTION:

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

  961.         break;

  962.     case TIFF_MAKE:

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

  964.         break;

  965.     case TIFF_MODEL:

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

  967.         break;

  968.     case TIFF_PAGE_NAME:

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

  970.         break;

  971.     case TIFF_PAGE_NUMBER:

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

  973.         break;

  974.     case TIFF_SOFTWARE_NAME:

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

  976.         break;

  977.     default:

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

  979.                tag, tag);

  980.     }

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

  982.     return 0;

  983. }

  984. 

  985. static int decode_frame(AVCodecContext *avctx,

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

  987. {

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

  989.     AVFrame *picture = data;

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

  991.     unsigned off;

  992.     int id, le, ret;

  993.     int i, j, entries;

  994.     int stride;

  995.     unsigned soff, ssize;

  996.     uint8_t *dst;

  997.     GetByteContext stripsizes;

  998.     GetByteContext stripdata;

  999. 

  1000.     bytestream2_init(&s->gb, avpkt->data, avpkt->size);

  1001. 

  1002.     //parse image header

  1003.     if (avpkt->size < 8)

  1004.         return AVERROR_INVALIDDATA;

  1005.     id = bytestream2_get_le16u(&s->gb);

  1006.     if (id == 0x4949)

  1007.         le = 1;

  1008.     else if (id == 0x4D4D)

  1009.         le = 0;

  1010.     else {

  1011.         av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");

  1012.         return -1;

  1013.     }

  1014.     s->le = le;

  1015.     // TIFF_BPP is not a required tag and defaults to 1

  1016.     s->bppcount = s->bpp = 1;

  1017.     s->invert = 0;

  1018.     s->compr = TIFF_RAW;

  1019.     s->fill_order = 0;

  1020.     free_geotags(s);

  1021.     /* free existing metadata */

  1022.     av_dict_free(&s->picture.metadata);

  1023. 

  1024.     // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number

  1025.     // that further identifies the file as a TIFF file"

  1026.     if (tget_short(&s->gb, le) != 42) {

  1027.         av_log(avctx, AV_LOG_ERROR,

  1028.                "The answer to life, universe and everything is not correct!\n");

  1029.         return -1;

  1030.     }

  1031.     // Reset these offsets so we can tell if they were set this frame

  1032.     s->stripsizesoff = s->strippos = 0;

  1033.     /* parse image file directory */

  1034.     off = tget_long(&s->gb, le);

  1035.     if (off >= UINT_MAX - 14 || avpkt->size < off + 14) {

  1036.         av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");

  1037.         return AVERROR_INVALIDDATA;

  1038.     }

  1039.     bytestream2_seek(&s->gb, off, SEEK_SET);

  1040.     entries = tget_short(&s->gb, le);

  1041.     if (bytestream2_get_bytes_left(&s->gb) < entries * 12)

  1042.         return AVERROR_INVALIDDATA;

  1043.     for (i = 0; i < entries; i++) {

  1044.         if (tiff_decode_tag(s) < 0)

  1045.             return -1;

  1046.     }

  1047. 

  1048.     for (i = 0; i<s->geotag_count; i++) {

  1049.         const char *keyname = get_geokey_name(s->geotags[i].key);

  1050.         if (!keyname) {

  1051.             av_log(avctx, AV_LOG_WARNING, "Unknown or unsupported GeoTIFF key %d\n", s->geotags[i].key);

  1052.             continue;

  1053.         }

  1054.         if (get_geokey_type(s->geotags[i].key) != s->geotags[i].type) {

  1055.             av_log(avctx, AV_LOG_WARNING, "Type of GeoTIFF key %d is wrong\n", s->geotags[i].key);

  1056.             continue;

  1057.         }

  1058.         ret = av_dict_set(&s->picture.metadata, keyname, s->geotags[i].val, 0);

  1059.         if (ret<0) {

  1060.             av_log(avctx, AV_LOG_ERROR, "Writing metadata with key '%s' failed\n", keyname);

  1061.             return ret;

  1062.         }

  1063.     }

  1064. 

  1065.     if (!s->strippos && !s->stripoff) {

  1066.         av_log(avctx, AV_LOG_ERROR, "Image data is missing\n");

  1067.         return -1;

  1068.     }

  1069.     /* now we have the data and may start decoding */

  1070.     if ((ret = init_image(s)) < 0)

  1071.         return ret;

  1072. 

  1073.     if (s->strips == 1 && !s->stripsize) {

  1074.         av_log(avctx, AV_LOG_WARNING, "Image data size missing\n");

  1075.         s->stripsize = avpkt->size - s->stripoff;

  1076.     }

  1077.     stride = p->linesize[0];

  1078.     dst = p->data[0];

  1079. 

  1080.     if (s->stripsizesoff) {

  1081.         if (s->stripsizesoff >= avpkt->size)

  1082.             return AVERROR_INVALIDDATA;

  1083.         bytestream2_init(&stripsizes, avpkt->data + s->stripsizesoff, avpkt->size - s->stripsizesoff);

  1084.     }

  1085.     if (s->strippos) {

  1086.         if (s->strippos >= avpkt->size)

  1087.             return AVERROR_INVALIDDATA;

  1088.         bytestream2_init(&stripdata, avpkt->data + s->strippos, avpkt->size - s->strippos);

  1089.     }

  1090. 

  1091.     for (i = 0; i < s->height; i += s->rps) {

  1092.         if (s->stripsizesoff)

  1093.             ssize = tget(&stripsizes, s->sstype, s->le);

  1094.         else

  1095.             ssize = s->stripsize;

  1096. 

  1097.         if (s->strippos)

  1098.             soff = tget(&stripdata, s->sot, s->le);

  1099.         else

  1100.             soff = s->stripoff;

  1101. 

  1102.         if (soff > avpkt->size || ssize > avpkt->size - soff) {

  1103.             av_log(avctx, AV_LOG_ERROR, "Invalid strip size/offset\n");

  1104.             return -1;

  1105.         }

  1106.         if (tiff_unpack_strip(s, dst, stride, avpkt->data + soff, ssize,

  1107.                               FFMIN(s->rps, s->height - i)) < 0)

  1108.             break;

  1109.         dst += s->rps * stride;

  1110.     }

  1111.     if (s->predictor == 2) {

  1112.         dst = p->data[0];

  1113.         soff = s->bpp >> 3;

  1114.         ssize = s->width * soff;

  1115.         if (s->avctx->pix_fmt == AV_PIX_FMT_RGB48LE ||

  1116.             s->avctx->pix_fmt == AV_PIX_FMT_RGBA64LE) {

  1117.             for (i = 0; i < s->height; i++) {

  1118.                 for (j = soff; j < ssize; j += 2)

  1119.                     AV_WL16(dst + j, AV_RL16(dst + j) + AV_RL16(dst + j - soff));

  1120.                 dst += stride;

  1121.             }

  1122.         } else if (s->avctx->pix_fmt == AV_PIX_FMT_RGB48BE ||

  1123.                    s->avctx->pix_fmt == AV_PIX_FMT_RGBA64BE) {

  1124.             for (i = 0; i < s->height; i++) {

  1125.                 for (j = soff; j < ssize; j += 2)

  1126.                     AV_WB16(dst + j, AV_RB16(dst + j) + AV_RB16(dst + j - soff));

  1127.                 dst += stride;

  1128.             }

  1129.         } else {

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

  1131.                 for (j = soff; j < ssize; j++)

  1132.                     dst[j] += dst[j - soff];

  1133.                 dst += stride;

  1134.             }

  1135.         }

  1136.     }

  1137. 

  1138.     if (s->invert) {

  1139.         dst = s->picture.data[0];

  1140.         for (i = 0; i < s->height; i++) {

  1141.             for (j = 0; j < s->picture.linesize[0]; j++)

  1142.                 dst[j] = (s->avctx->pix_fmt == AV_PIX_FMT_PAL8 ? (1<<s->bpp) - 1 : 255) - dst[j];

  1143.             dst += s->picture.linesize[0];

  1144.         }

  1145.     }

  1146.     *picture   = s->picture;

  1147.     *data_size = sizeof(AVPicture);

  1148. 

  1149.     return avpkt->size;

  1150. }

  1151. 

  1152. static av_cold int tiff_init(AVCodecContext *avctx)

  1153. {

  1154.     TiffContext *s = avctx->priv_data;

  1155. 

  1156.     s->width = 0;

  1157.     s->height = 0;

  1158.     s->avctx = avctx;

  1159.     avcodec_get_frame_defaults(&s->picture);

  1160.     avctx->coded_frame = &s->picture;

  1161.     ff_lzw_decode_open(&s->lzw);

  1162.     ff_ccitt_unpack_init();

  1163. 

  1164.     return 0;

  1165. }

  1166. 

  1167. static av_cold int tiff_end(AVCodecContext *avctx)

  1168. {

  1169.     TiffContext *const s = avctx->priv_data;

  1170. 

  1171.     free_geotags(s);

  1172.     if (avctx->coded_frame && avctx->coded_frame->metadata)

  1173.         av_dict_free(&avctx->coded_frame->metadata);

  1174. 

  1175.     ff_lzw_decode_close(&s->lzw);

  1176.     if (s->picture.data[0])

  1177.         avctx->release_buffer(avctx, &s->picture);

  1178.     return 0;

  1179. }

  1180. 

  1181. AVCodec ff_tiff_decoder = {

  1182.     .name           = "tiff",

  1183.     .type           = AVMEDIA_TYPE_VIDEO,

  1184.     .id             = AV_CODEC_ID_TIFF,

  1185.     .priv_data_size = sizeof(TiffContext),

  1186.     .init           = tiff_init,

  1187.     .close          = tiff_end,

  1188.     .decode         = decode_frame,

  1189.     .capabilities   = CODEC_CAP_DR1,

  1190.     .long_name      = NULL_IF_CONFIG_SMALL("TIFF image"),

  1191. };