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FFmpeg/libavcodec/tiff.c

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  1. /*

  2.  * Copyright (c) 2006 Konstantin Shishkov

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. /**

  22.  * @file

  23.  * TIFF image decoder

  24.  * @author Konstantin Shishkov

  25.  */

  26. 

  27. #include "avcodec.h"

  28. #if CONFIG_ZLIB

  29. #include <zlib.h>

  30. #endif

  31. #include "lzw.h"

  32. #include "tiff.h"

  33. #include "tiff_data.h"

  34. #include "faxcompr.h"

  35. #include "libavutil/common.h"

  36. #include "libavutil/intreadwrite.h"

  37. #include "libavutil/imgutils.h"

  38. #include "libavutil/avstring.h"

  39. 

  40. typedef struct TiffContext {

  41.     AVCodecContext *avctx;

  42.     AVFrame picture;

  43. 

  44.     int width, height;

  45.     unsigned int bpp, bppcount;

  46.     uint32_t palette[256];

  47.     int palette_is_set;

  48.     int le;

  49.     enum TiffCompr compr;

  50.     int invert;

  51.     int fax_opts;

  52.     int predictor;

  53.     int fill_order;

  54. 

  55.     int strips, rps, sstype;

  56.     int sot;

  57.     const uint8_t *stripdata;

  58.     const uint8_t *stripsizes;

  59.     int stripsize, stripoff;

  60.     LZWState *lzw;

  61. 

  62.     int geotag_count;

  63.     TiffGeoTag *geotags;

  64. } TiffContext;

  65. 

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

  67. {

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

  69.     *p += 2;

  70.     return v;

  71. }

  72. 

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

  74. {

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

  76.     *p += 4;

  77.     return v;

  78. }

  79. 

  80. static double tget_double(const uint8_t **p, int le)

  81. {

  82.     av_alias64 i = { .u64 = le ? AV_RL64(*p) : AV_RB64(*p)};

  83.     *p += 8;

  84.     return i.f64;

  85. }

  86. 

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

  88. {

  89.     switch (type) {

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

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

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

  93.     default        : return UINT_MAX;

  94.     }

  95. }

  96. 

  97. static void free_geotags(TiffContext *const s)

  98. {

  99.     int i;

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

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

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

  103.     }

  104.     av_freep(&s->geotags);

  105. }

  106. 

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

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

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

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

  111. 

  112. static const char *get_geokey_name(int key)

  113. {

  114.     RET_GEOKEY(VERT, vert, name);

  115.     RET_GEOKEY(PROJ, proj, name);

  116.     RET_GEOKEY(GEOG, geog, name);

  117.     RET_GEOKEY(CONF, conf, name);

  118. 

  119.     return NULL;

  120. }

  121. 

  122. static int get_geokey_type(int key)

  123. {

  124.     RET_GEOKEY(VERT, vert, type);

  125.     RET_GEOKEY(PROJ, proj, type);

  126.     RET_GEOKEY(GEOG, geog, type);

  127.     RET_GEOKEY(CONF, conf, type);

  128. 

  129.     return AVERROR_INVALIDDATA;

  130. }

  131. 

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

  133. {

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

  135. }

  136. 

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

  138. {

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

  140. }

  141. 

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

  143. {

  144.     char *ap;

  145. 

  146.     if (val == TIFF_GEO_KEY_UNDEFINED)

  147.         return av_strdup("undefined");

  148.     if (val == TIFF_GEO_KEY_USER_DEFINED)

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

  150. 

  151. #define RET_GEOKEY_VAL(TYPE, array)\

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

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

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

  155. 

  156.     switch (key) {

  157.     case TIFF_GT_MODEL_TYPE_GEOKEY:

  158.         RET_GEOKEY_VAL(GT_MODEL_TYPE, gt_model_type);

  159.         break;

  160.     case TIFF_GT_RASTER_TYPE_GEOKEY:

  161.         RET_GEOKEY_VAL(GT_RASTER_TYPE, gt_raster_type);

  162.         break;

  163.     case TIFF_GEOG_LINEAR_UNITS_GEOKEY:

  164.     case TIFF_PROJ_LINEAR_UNITS_GEOKEY:

  165.     case TIFF_VERTICAL_UNITS_GEOKEY:

  166.         RET_GEOKEY_VAL(LINEAR_UNIT, linear_unit);

  167.         break;

  168.     case TIFF_GEOG_ANGULAR_UNITS_GEOKEY:

  169.     case TIFF_GEOG_AZIMUTH_UNITS_GEOKEY:

  170.         RET_GEOKEY_VAL(ANGULAR_UNIT, angular_unit);

  171.         break;

  172.     case TIFF_GEOGRAPHIC_TYPE_GEOKEY:

  173.         RET_GEOKEY_VAL(GCS_TYPE, gcs_type);

  174.         RET_GEOKEY_VAL(GCSE_TYPE, gcse_type);

  175.         break;

  176.     case TIFF_GEOG_GEODETIC_DATUM_GEOKEY:

  177.         RET_GEOKEY_VAL(GEODETIC_DATUM, geodetic_datum);

  178.         RET_GEOKEY_VAL(GEODETIC_DATUM_E, geodetic_datum_e);

  179.         break;

  180.     case TIFF_GEOG_ELLIPSOID_GEOKEY:

  181.         RET_GEOKEY_VAL(ELLIPSOID, ellipsoid);

  182.         break;

  183.     case TIFF_GEOG_PRIME_MERIDIAN_GEOKEY:

  184.         RET_GEOKEY_VAL(PRIME_MERIDIAN, prime_meridian);

  185.         break;

  186.     case TIFF_PROJECTED_CS_TYPE_GEOKEY:

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

  188.         break;

  189.     case TIFF_PROJECTION_GEOKEY:

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

  191.         break;

  192.     case TIFF_PROJ_COORD_TRANS_GEOKEY:

  193.         RET_GEOKEY_VAL(COORD_TRANS, coord_trans);

  194.         break;

  195.     case TIFF_VERTICAL_CS_TYPE_GEOKEY:

  196.         RET_GEOKEY_VAL(VERT_CS, vert_cs);

  197.         RET_GEOKEY_VAL(ORTHO_VERT_CS, ortho_vert_cs);

  198.         break;

  199. 

  200.     }

  201. 

  202.     ap = av_malloc(14);

  203.     if (ap)

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

  205.     return ap;

  206. }

  207. 

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

  209. {

  210.     int i;

  211.     char *ap, *ap0;

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

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

  214.     if (!ap)

  215.         return NULL;

  216.     ap0   = ap;

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

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

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

  220.         ap += l;

  221.     }

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

  223.     return ap0;

  224. }

  225. 

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

  227. {

  228.     int i;

  229.     char *ap, *ap0;

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

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

  232.     if (!ap)

  233.         return NULL;

  234.     ap0   = ap;

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

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

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

  238.         ap += l;

  239.     }

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

  241.     return ap0;

  242. }

  243. 

  244. static int add_doubles_metadata(const uint8_t **buf, int count,

  245.                                 const char *name, const char *sep,

  246.                                 TiffContext *s)

  247. {

  248.     char *ap;

  249.     int i;

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

  251.     if (!dp)

  252.         return AVERROR(ENOMEM);

  253. 

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

  255.         dp[i] = tget_double(buf, s->le);

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

  257.     av_freep(&dp);

  258.     if (!ap)

  259.         return AVERROR(ENOMEM);

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

  261.     return 0;

  262. }

  263. 

  264. static int add_shorts_metadata(const uint8_t **buf, int count, const char *name,

  265.                                const char *sep, TiffContext *s)

  266. {

  267.     char *ap;

  268.     int i;

  269.     int *sp = av_malloc(count * sizeof(int));

  270.     if (!sp)

  271.         return AVERROR(ENOMEM);

  272. 

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

  274.         sp[i] = tget_short(buf, s->le);

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

  276.     av_freep(&sp);

  277.     if (!ap)

  278.         return AVERROR(ENOMEM);

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

  280.     return 0;

  281. }

  282. 

  283. static int add_metadata(const uint8_t **buf, int count, int type,

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

  285. {

  286.     switch(type) {

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

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

  289.     default         : return AVERROR_INVALIDDATA;

  290.     };

  291. }

  292. 

  293. #if CONFIG_ZLIB

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

  295.                            int size)

  296. {

  297.     z_stream zstream = { 0 };

  298.     int zret;

  299. 

  300.     zstream.next_in = src;

  301.     zstream.avail_in = size;

  302.     zstream.next_out = dst;

  303.     zstream.avail_out = *len;

  304.     zret = inflateInit(&zstream);

  305.     if (zret != Z_OK) {

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

  307.         return zret;

  308.     }

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

  310.     inflateEnd(&zstream);

  311.     *len = zstream.total_out;

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

  313. }

  314. #endif

  315. 

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

  317.                                              int usePtr, const uint8_t *src,

  318.                                              uint8_t c, int width, int offset)

  319. {

  320.     switch (bpp) {

  321.     case 1:

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

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

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

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

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

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

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

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

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

  331.         }

  332.         break;

  333.     case 2:

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

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

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

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

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

  339.         }

  340.         break;

  341.     case 4:

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

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

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

  345.         }

  346.         break;

  347.     default:

  348.         if (usePtr) {

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

  350.         } else {

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

  352.         }

  353.     }

  354. }

  355. 

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

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

  358. {

  359.     int c, line, pixels, code;

  360.     const uint8_t *ssrc = src;

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

  362. 

  363.     if (size <= 0)

  364.         return AVERROR_INVALIDDATA;

  365. 

  366. #if CONFIG_ZLIB

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

  368.         uint8_t *zbuf;

  369.         unsigned long outlen;

  370.         int ret;

  371.         outlen = width * lines;

  372.         zbuf = av_malloc(outlen);

  373.         if (!zbuf)

  374.             return AVERROR(ENOMEM);

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

  376.         if (ret != Z_OK) {

  377.             av_log(s->avctx, AV_LOG_ERROR,

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

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

  380.             av_free(zbuf);

  381.             return -1;

  382.         }

  383.         src = zbuf;

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

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

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

  387.             }else{

  388.                 memcpy(dst, src, width);

  389.             }

  390.             dst += stride;

  391.             src += width;

  392.         }

  393.         av_free(zbuf);

  394.         return 0;

  395.     }

  396. #endif

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

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

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

  400.             return -1;

  401.         }

  402.     }

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

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

  405.         int i, ret = 0;

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

  407.                                   FF_INPUT_BUFFER_PADDING_SIZE);

  408. 

  409.         if (!src2) {

  410.             av_log(s->avctx, AV_LOG_ERROR,

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

  412.             return AVERROR(ENOMEM);

  413.         }

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

  415.             av_log(s->avctx, AV_LOG_ERROR,

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

  417.             av_free(src2);

  418.             return -1;

  419.         }

  420.         if (!s->fill_order) {

  421.             memcpy(src2, src, size);

  422.         } else {

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

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

  425.         }

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

  427.         switch (s->compr) {

  428.         case TIFF_CCITT_RLE:

  429.         case TIFF_G3:

  430.         case TIFF_G4:

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

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

  433.             break;

  434.         }

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

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

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

  438.                 dst += stride;

  439.             }

  440.         av_free(src2);

  441.         return ret;

  442.     }

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

  444.         if (src - ssrc > size) {

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

  446.             return -1;

  447.         }

  448.         switch (s->compr) {

  449.         case TIFF_RAW:

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

  451.                 return AVERROR_INVALIDDATA;

  452.             if (!s->fill_order) {

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

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

  455.             } else {

  456.                 int i;

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

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

  459.             }

  460.             src += width;

  461.             break;

  462.         case TIFF_PACKBITS:

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

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

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

  466.                     return AVERROR_INVALIDDATA;

  467.                 }

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

  469.                 if (code >= 0) {

  470.                     code++;

  471.                     if (pixels + code > width) {

  472.                         av_log(s->avctx, AV_LOG_ERROR,

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

  474.                         return -1;

  475.                     }

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

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

  478.                         return AVERROR_INVALIDDATA;

  479.                     }

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

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

  482.                     src += code;

  483.                     pixels += code;

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

  485.                     code = (-code) + 1;

  486.                     if (pixels + code > width) {

  487.                         av_log(s->avctx, AV_LOG_ERROR,

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

  489.                         return -1;

  490.                     }

  491.                     c = *src++;

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

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

  494.                     pixels += code;

  495.                 }

  496.             }

  497.             break;

  498.         case TIFF_LZW:

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

  500.             if (pixels < width) {

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

  502.                        pixels, width);

  503.                 return -1;

  504.             }

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

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

  507.             break;

  508.         }

  509.         dst += stride;

  510.     }

  511.     return 0;

  512. }

  513. 

  514. static int init_image(TiffContext *s)

  515. {

  516.     int i, ret;

  517.     uint32_t *pal;

  518. 

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

  520.     case 11:

  521.         if (!s->palette_is_set) {

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

  523.             break;

  524.         }

  525.     case 21:

  526.     case 41:

  527.     case 81:

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

  529.         break;

  530.     case 243:

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

  532.         break;

  533.     case 161:

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

  535.         break;

  536.     case 162:

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

  538.         break;

  539.     case 324:

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

  541.         break;

  542.     case 483:

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

  544.         break;

  545.     case 644:

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

  547.         break;

  548.     default:

  549.         av_log(s->avctx, AV_LOG_ERROR,

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

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

  552.         return AVERROR_INVALIDDATA;

  553.     }

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

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

  556.             return ret;

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

  558.     }

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

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

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

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

  563.         return ret;

  564.     }

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

  566.         if (s->palette_is_set) {

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

  568.         } else {

  569.             /* make default grayscale pal */

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

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

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

  573.         }

  574.     }

  575.     return 0;

  576. }

  577. 

  578. static int tiff_decode_tag(TiffContext *s, const uint8_t *start,

  579.                            const uint8_t *buf, const uint8_t *end_buf)

  580. {

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

  582.     int i, j;

  583.     int ret;

  584.     uint32_t *pal;

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

  586.     double *dp;

  587. 

  588.     if (end_buf - buf < 12)

  589.         return -1;

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

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

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

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

  594. 

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

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

  597.                type);

  598.         return 0;

  599.     }

  600. 

  601.     if (count == 1) {

  602.         switch (type) {

  603.         case TIFF_BYTE:

  604.         case TIFF_SHORT:

  605.             buf -= 4;

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

  607.             buf = NULL;

  608.             break;

  609.         case TIFF_LONG:

  610.             value = off;

  611.             buf = NULL;

  612.             break;

  613.         case TIFF_STRING:

  614.             if (count <= 4) {

  615.                 buf -= 4;

  616.                 break;

  617.             }

  618.         default:

  619.             value = UINT_MAX;

  620.             buf = start + off;

  621.         }

  622.     } else {

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

  624.             buf -= 4;

  625.         } else {

  626.             buf = start + off;

  627.         }

  628.     }

  629. 

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

  631.         av_log(s->avctx, AV_LOG_ERROR,

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

  633.         return -1;

  634.     }

  635. 

  636.     switch (tag) {

  637.     case TIFF_WIDTH:

  638.         s->width = value;

  639.         break;

  640.     case TIFF_HEIGHT:

  641.         s->height = value;

  642.         break;

  643.     case TIFF_BPP:

  644.         s->bppcount = count;

  645.         if (count > 4) {

  646.             av_log(s->avctx, AV_LOG_ERROR,

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

  648.                    s->bpp, count);

  649.             return -1;

  650.         }

  651.         if (count == 1)

  652.             s->bpp = value;

  653.         else {

  654.             switch (type) {

  655.             case TIFF_BYTE:

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

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

  658.                 break;

  659.             case TIFF_SHORT:

  660.             case TIFF_LONG:

  661.                 s->bpp = 0;

  662.                 for (i = 0; i < count && buf < end_buf; i++)

  663.                     s->bpp += tget(&buf, type, s->le);

  664.                 break;

  665.             default:

  666.                 s->bpp = -1;

  667.             }

  668.         }

  669.         break;

  670.     case TIFF_SAMPLES_PER_PIXEL:

  671.         if (count != 1) {

  672.             av_log(s->avctx, AV_LOG_ERROR,

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

  674.             return AVERROR_INVALIDDATA;

  675.         }

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

  677.             s->bpp *= value;

  678.         s->bppcount = value;

  679.         break;

  680.     case TIFF_COMPR:

  681.         s->compr = value;

  682.         s->predictor = 0;

  683.         switch (s->compr) {

  684.         case TIFF_RAW:

  685.         case TIFF_PACKBITS:

  686.         case TIFF_LZW:

  687.         case TIFF_CCITT_RLE:

  688.             break;

  689.         case TIFF_G3:

  690.         case TIFF_G4:

  691.             s->fax_opts = 0;

  692.             break;

  693.         case TIFF_DEFLATE:

  694.         case TIFF_ADOBE_DEFLATE:

  695. #if CONFIG_ZLIB

  696.             break;

  697. #else

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

  699.             return -1;

  700. #endif

  701.         case TIFF_JPEG:

  702.         case TIFF_NEWJPEG:

  703.             av_log(s->avctx, AV_LOG_ERROR,

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

  705.             return -1;

  706.         default:

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

  708.                    s->compr);

  709.             return -1;

  710.         }

  711.         break;

  712.     case TIFF_ROWSPERSTRIP:

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

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

  715.         if (value < 1) {

  716.             av_log(s->avctx, AV_LOG_ERROR,

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

  718.             return -1;

  719.         }

  720.         s->rps = value;

  721.         break;

  722.     case TIFF_STRIP_OFFS:

  723.         if (count == 1) {

  724.             s->stripdata = NULL;

  725.             s->stripoff = value;

  726.         } else

  727.             s->stripdata = start + off;

  728.         s->strips = count;

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

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

  731.         s->sot = type;

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

  733.             av_log(s->avctx, AV_LOG_ERROR,

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

  735.             return -1;

  736.         }

  737.         break;

  738.     case TIFF_STRIP_SIZE:

  739.         if (count == 1) {

  740.             s->stripsizes = NULL;

  741.             s->stripsize = value;

  742.             s->strips = 1;

  743.         } else {

  744.             s->stripsizes = start + off;

  745.         }

  746.         s->strips = count;

  747.         s->sstype = type;

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

  749.             av_log(s->avctx, AV_LOG_ERROR,

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

  751.             return -1;

  752.         }

  753.         break;

  754.     case TIFF_TILE_BYTE_COUNTS:

  755.     case TIFF_TILE_LENGTH:

  756.     case TIFF_TILE_OFFSETS:

  757.     case TIFF_TILE_WIDTH:

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

  759.         return AVERROR_PATCHWELCOME;

  760.         break;

  761.     case TIFF_PREDICTOR:

  762.         s->predictor = value;

  763.         break;

  764.     case TIFF_INVERT:

  765.         switch (value) {

  766.         case 0:

  767.             s->invert = 1;

  768.             break;

  769.         case 1:

  770.             s->invert = 0;

  771.             break;

  772.         case 2:

  773.         case 3:

  774.             break;

  775.         default:

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

  777.                    value);

  778.             return -1;

  779.         }

  780.         break;

  781.     case TIFF_FILL_ORDER:

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

  783.             av_log(s->avctx, AV_LOG_ERROR,

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

  785.             value = 1;

  786.         }

  787.         s->fill_order = value - 1;

  788.         break;

  789.     case TIFF_PAL:

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

  791.         off = type_sizes[type];

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

  793.             return -1;

  794.         rp = buf;

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

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

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

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

  799.             j = 0xff << 24;

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

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

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

  803.             pal[i] = j;

  804.         }

  805.         s->palette_is_set = 1;

  806.         break;

  807.     case TIFF_PLANAR:

  808.         if (value == 2) {

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

  810.             return -1;

  811.         }

  812.         break;

  813.     case TIFF_T4OPTIONS:

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

  815.             s->fax_opts = value;

  816.         break;

  817.     case TIFF_T6OPTIONS:

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

  819.             s->fax_opts = value;

  820.         break;

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

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

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

  824.         return ret;\

  825.     }

  826.     case TIFF_MODEL_PIXEL_SCALE:

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

  828.         break;

  829.     case TIFF_MODEL_TRANSFORMATION:

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

  831.         break;

  832.     case TIFF_MODEL_TIEPOINT:

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

  834.         break;

  835.     case TIFF_GEO_KEY_DIRECTORY:

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

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

  838.         s->geotag_count   = tget_short(&buf, s->le);

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

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

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

  842.         }

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

  844.         if (!s->geotags) {

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

  846.             return AVERROR(ENOMEM);

  847.         }

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

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

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

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

  852. 

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

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

  855.             else

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

  857.         }

  858.         break;

  859.     case TIFF_GEO_DOUBLE_PARAMS:

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

  861.         if (!dp) {

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

  863.             return AVERROR(ENOMEM);

  864.         }

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

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

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

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

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

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

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

  872.                 } else {

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

  874.                     if (!ap) {

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

  876.                         av_freep(&dp);

  877.                         return AVERROR(ENOMEM);

  878.                     }

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

  880.                 }

  881.             }

  882.         }

  883.         av_freep(&dp);

  884.         break;

  885.     case TIFF_GEO_ASCII_PARAMS:

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

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

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

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

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

  891.                 } else {

  892.                     char *ap = av_malloc(s->geotags[i].count);

  893.                     if (!ap) {

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

  895.                         return AVERROR(ENOMEM);

  896.                     }

  897.                     memcpy(ap, &buf[s->geotags[i].offset], s->geotags[i].count);

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

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

  900.                 }

  901.             }

  902.         }

  903.         break;

  904.     default:

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

  906.                tag, tag);

  907.     }

  908.     return 0;

  909. }

  910. 

  911. static int decode_frame(AVCodecContext *avctx,

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

  913. {

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

  915.     int buf_size = avpkt->size;

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

  917.     AVFrame *picture = data;

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

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

  920.     unsigned off;

  921.     int id, le, ret;

  922.     int i, j, entries;

  923.     int stride;

  924.     unsigned soff, ssize;

  925.     uint8_t *dst;

  926. 

  927.     //parse image header

  928.     if (end_buf - buf < 8)

  929.         return AVERROR_INVALIDDATA;

  930.     id = AV_RL16(buf);

  931.     buf += 2;

  932.     if (id == 0x4949)

  933.         le = 1;

  934.     else if (id == 0x4D4D)

  935.         le = 0;

  936.     else {

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

  938.         return -1;

  939.     }

  940.     s->le = le;

  941.     s->invert = 0;

  942.     s->compr = TIFF_RAW;

  943.     s->fill_order = 0;

  944.     free_geotags(s);

  945.     /* free existing metadata */

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

  947. 

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

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

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

  951.         av_log(avctx, AV_LOG_ERROR,

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

  953.         return -1;

  954.     }

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

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

  957.     /* parse image file directory */

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

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

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

  961.         return AVERROR_INVALIDDATA;

  962.     }

  963.     buf = orig_buf + off;

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

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

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

  967.             return -1;

  968.         buf += 12;

  969.     }

  970. 

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

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

  973.         if (!keyname) {

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

  975.             continue;

  976.         }

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

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

  979.             continue;

  980.         }

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

  982.         if (ret<0) {

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

  984.             return ret;

  985.         }

  986.     }

  987. 

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

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

  990.         return -1;

  991.     }

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

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

  994.         return ret;

  995. 

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

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

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

  999.     }

  1000.     stride = p->linesize[0];

  1001.     dst = p->data[0];

  1002.     for (i = 0; i < s->height; i += s->rps) {

  1003.         if (s->stripsizes) {

  1004.             if (s->stripsizes >= end_buf)

  1005.                 return AVERROR_INVALIDDATA;

  1006.             ssize = tget(&s->stripsizes, s->sstype, s->le);

  1007.         } else

  1008.             ssize = s->stripsize;

  1009. 

  1010.         if (s->stripdata) {

  1011.             if (s->stripdata >= end_buf)

  1012.                 return AVERROR_INVALIDDATA;

  1013.             soff = tget(&s->stripdata, s->sot, s->le);

  1014.         } else

  1015.             soff = s->stripoff;

  1016. 

  1017.         if (soff > buf_size || ssize > buf_size - soff) {

  1018.             av_log(avctx, AV_LOG_ERROR, "Invalid strip size/offset\n");

  1019.             return -1;

  1020.         }

  1021.         if (tiff_unpack_strip(s, dst, stride, orig_buf + soff, ssize,

  1022.                               FFMIN(s->rps, s->height - i)) < 0)

  1023.             break;

  1024.         dst += s->rps * stride;

  1025.     }

  1026.     if (s->predictor == 2) {

  1027.         dst = p->data[0];

  1028.         soff = s->bpp >> 3;

  1029.         ssize = s->width * soff;

  1030.         if (s->avctx->pix_fmt == PIX_FMT_RGB48LE ||

  1031.             s->avctx->pix_fmt == PIX_FMT_RGBA64LE) {

  1032.             for (i = 0; i < s->height; i++) {

  1033.                 for (j = soff; j < ssize; j += 2)

  1034.                     AV_WL16(dst + j, AV_RL16(dst + j) + AV_RL16(dst + j - soff));

  1035.                 dst += stride;

  1036.             }

  1037.         } else if (s->avctx->pix_fmt == PIX_FMT_RGB48BE ||

  1038.                    s->avctx->pix_fmt == PIX_FMT_RGBA64BE) {

  1039.             for (i = 0; i < s->height; i++) {

  1040.                 for (j = soff; j < ssize; j += 2)

  1041.                     AV_WB16(dst + j, AV_RB16(dst + j) + AV_RB16(dst + j - soff));

  1042.                 dst += stride;

  1043.             }

  1044.         } else {

  1045.             for (i = 0; i < s->height; i++) {

  1046.                 for (j = soff; j < ssize; j++)

  1047.                     dst[j] += dst[j - soff];

  1048.                 dst += stride;

  1049.             }

  1050.         }

  1051.     }

  1052. 

  1053.     if (s->invert) {

  1054.         dst = s->picture.data[0];

  1055.         for (i = 0; i < s->height; i++) {

  1056.             for (j = 0; j < s->picture.linesize[0]; j++)

  1057.                 dst[j] = (s->avctx->pix_fmt == PIX_FMT_PAL8 ? (1<<s->bpp) - 1 : 255) - dst[j];

  1058.             dst += s->picture.linesize[0];

  1059.         }

  1060.     }

  1061.     *picture   = s->picture;

  1062.     *data_size = sizeof(AVPicture);

  1063. 

  1064.     return buf_size;

  1065. }

  1066. 

  1067. static av_cold int tiff_init(AVCodecContext *avctx)

  1068. {

  1069.     TiffContext *s = avctx->priv_data;

  1070. 

  1071.     s->width = 0;

  1072.     s->height = 0;

  1073.     s->avctx = avctx;

  1074.     avcodec_get_frame_defaults(&s->picture);

  1075.     avctx->coded_frame = &s->picture;

  1076.     ff_lzw_decode_open(&s->lzw);

  1077.     ff_ccitt_unpack_init();

  1078. 

  1079.     return 0;

  1080. }

  1081. 

  1082. static av_cold int tiff_end(AVCodecContext *avctx)

  1083. {

  1084.     TiffContext *const s = avctx->priv_data;

  1085. 

  1086.     free_geotags(s);

  1087.     if (avctx->coded_frame && avctx->coded_frame->metadata)

  1088.         av_dict_free(&avctx->coded_frame->metadata);

  1089. 

  1090.     ff_lzw_decode_close(&s->lzw);

  1091.     if (s->picture.data[0])

  1092.         avctx->release_buffer(avctx, &s->picture);

  1093.     return 0;

  1094. }

  1095. 

  1096. AVCodec ff_tiff_decoder = {

  1097.     .name           = "tiff",

  1098.     .type           = AVMEDIA_TYPE_VIDEO,

  1099.     .id             = CODEC_ID_TIFF,

  1100.     .priv_data_size = sizeof(TiffContext),

  1101.     .init           = tiff_init,

  1102.     .close          = tiff_end,

  1103.     .decode         = decode_frame,

  1104.     .capabilities   = CODEC_CAP_DR1,

  1105.     .long_name      = NULL_IF_CONFIG_SMALL("TIFF image"),

  1106. };