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FFmpeg/libavcodec/tiff.c

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  1. /*

  2.  * TIFF image decoder

  3.  * Copyright (c) 2006 Konstantin Shishkov

  4.  *

  5.  * This file is part of Libav.

  6.  *

  7.  * Libav is free software; you can redistribute it and/or

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

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

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

  11.  *

  12.  * Libav is distributed in the hope that it will be useful,

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

  18.  * License along with Libav; if not, write to the Free Software

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

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * TIFF image decoder

  25.  * @author Konstantin Shishkov

  26.  */

  27. 

  28. #include "config.h"

  29. #if CONFIG_ZLIB

  30. #include <zlib.h>

  31. #endif

  32. 

  33. #include "libavutil/attributes.h"

  34. #include "libavutil/intreadwrite.h"

  35. #include "libavutil/imgutils.h"

  36. #include "avcodec.h"

  37. #include "bytestream.h"

  38. #include "faxcompr.h"

  39. #include "internal.h"

  40. #include "lzw.h"

  41. #include "mathops.h"

  42. #include "tiff.h"

  43. 

  44. typedef struct TiffContext {

  45.     AVCodecContext *avctx;

  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.     enum TiffPhotometric photometric;

  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. } TiffContext;

  64. 

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

  66. {

  67.     return le ? bytestream2_get_le16(gb) : bytestream2_get_be16(gb);

  68. }

  69. 

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

  71. {

  72.     return le ? bytestream2_get_le32(gb) : bytestream2_get_be32(gb);

  73. }

  74. 

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

  76. {

  77.     switch (type) {

  78.     case TIFF_BYTE:  return bytestream2_get_byte(gb);

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

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

  81.     default:         return UINT_MAX;

  82.     }

  83. }

  84. 

  85. #if CONFIG_ZLIB

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

  87.                            int size)

  88. {

  89.     z_stream zstream = { 0 };

  90.     int zret;

  91. 

  92.     zstream.next_in   = src;

  93.     zstream.avail_in  = size;

  94.     zstream.next_out  = dst;

  95.     zstream.avail_out = *len;

  96.     zret              = inflateInit(&zstream);

  97.     if (zret != Z_OK) {

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

  99.         return zret;

  100.     }

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

  102.     inflateEnd(&zstream);

  103.     *len = zstream.total_out;

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

  105. }

  106. 

  107. static int tiff_unpack_zlib(TiffContext *s, uint8_t *dst, int stride,

  108.                             const uint8_t *src, int size,

  109.                             int width, int lines)

  110. {

  111.     uint8_t *zbuf;

  112.     unsigned long outlen;

  113.     int ret, line;

  114.     outlen = width * lines;

  115.     zbuf   = av_malloc(outlen);

  116.     if (!zbuf)

  117.         return AVERROR(ENOMEM);

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

  119.     if (ret != Z_OK) {

  120.         av_log(s->avctx, AV_LOG_ERROR,

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

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

  123.         av_free(zbuf);

  124.         return AVERROR_UNKNOWN;

  125.     }

  126.     src = zbuf;

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

  128.         memcpy(dst, src, width);

  129.         dst += stride;

  130.         src += width;

  131.     }

  132.     av_free(zbuf);

  133.     return 0;

  134. }

  135. #endif

  136. 

  137. 

  138. static int tiff_unpack_fax(TiffContext *s, uint8_t *dst, int stride,

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

  140. {

  141.     int i, ret = 0;

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

  143.                               FF_INPUT_BUFFER_PADDING_SIZE);

  144. 

  145.     if (!src2) {

  146.         av_log(s->avctx, AV_LOG_ERROR,

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

  148.         return AVERROR(ENOMEM);

  149.     }

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

  151.         avpriv_request_sample(s->avctx, "Uncompressed fax mode");

  152.         av_free(src2);

  153.         return AVERROR_PATCHWELCOME;

  154.     }

  155.     if (!s->fill_order) {

  156.         memcpy(src2, src, size);

  157.     } else {

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

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

  160.     }

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

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

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

  164.     av_free(src2);

  165.     return ret;

  166. }

  167. 

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

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

  170. {

  171.     PutByteContext pb;

  172.     int c, line, pixels, code, ret;

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

  174. 

  175.     if (size <= 0)

  176.         return AVERROR_INVALIDDATA;

  177. 

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

  179. #if CONFIG_ZLIB

  180.         return tiff_unpack_zlib(s, dst, stride, src, size, width, lines);

  181. #else

  182.         av_log(s->avctx, AV_LOG_ERROR,

  183.                "zlib support not enabled, "

  184.                "deflate compression not supported\n");

  185.         return AVERROR(ENOSYS);

  186. #endif

  187.     }

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

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

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

  191.             return ret;

  192.         }

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

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

  195.             if (pixels < width) {

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

  197.                        pixels, width);

  198.                 return AVERROR_INVALIDDATA;

  199.             }

  200.             dst += stride;

  201.         }

  202.         return 0;

  203.     }

  204.     if (s->compr == TIFF_CCITT_RLE ||

  205.         s->compr == TIFF_G3        ||

  206.         s->compr == TIFF_G4) {

  207.         return tiff_unpack_fax(s, dst, stride, src, size, lines);

  208.     }

  209. 

  210.     bytestream2_init(&s->gb, src, size);

  211.     bytestream2_init_writer(&pb, dst, stride * lines);

  212. 

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

  214.         if (bytestream2_get_bytes_left(&s->gb) == 0 || bytestream2_get_eof(&pb))

  215.             break;

  216.         bytestream2_seek_p(&pb, stride * line, SEEK_SET);

  217.         switch (s->compr) {

  218.         case TIFF_RAW:

  219.             if (!s->fill_order) {

  220.                 bytestream2_copy_buffer(&pb, &s->gb, width);

  221.             } else {

  222.                 int i;

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

  224.                     bytestream2_put_byte(&pb, ff_reverse[bytestream2_get_byte(&s->gb)]);

  225.             }

  226.             break;

  227.         case TIFF_PACKBITS:

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

  229.                 code = ff_u8_to_s8(bytestream2_get_byte(&s->gb));

  230.                 if (code >= 0) {

  231.                     code++;

  232.                     bytestream2_copy_buffer(&pb, &s->gb, code);

  233.                     pixels += code;

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

  235.                     code = (-code) + 1;

  236.                     c    = bytestream2_get_byte(&s->gb);

  237.                     bytestream2_set_buffer(&pb, c, code);

  238.                     pixels += code;

  239.                 }

  240.             }

  241.             break;

  242.         }

  243.     }

  244.     return 0;

  245. }

  246. 

  247. static int init_image(TiffContext *s, AVFrame *frame)

  248. {

  249.     int ret;

  250. 

  251.     // make sure there is no aliasing in the following switch

  252.     if (s->bpp >= 100 || s->bppcount >= 10) {

  253.         av_log(s->avctx, AV_LOG_ERROR,

  254.                "Unsupported image parameters: bpp=%d, bppcount=%d\n",

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

  256.         return AVERROR_INVALIDDATA;

  257.     }

  258. 

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

  260.     case 11:

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

  262.         break;

  263.     case 81:

  264.         s->avctx->pix_fmt = s->palette_is_set ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_GRAY8;

  265.         break;

  266.     case 243:

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

  268.         break;

  269.     case 161:

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

  271.         break;

  272.     case 162:

  273.         s->avctx->pix_fmt = AV_PIX_FMT_YA8;

  274.         break;

  275.     case 322:

  276.         s->avctx->pix_fmt = s->le ? AV_PIX_FMT_YA16LE : AV_PIX_FMT_YA16BE;

  277.         break;

  278.     case 324:

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

  280.         break;

  281.     case 483:

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

  283.         break;

  284.     default:

  285.         av_log(s->avctx, AV_LOG_ERROR,

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

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

  288.         return AVERROR_INVALIDDATA;

  289.     }

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

  291.         ret = ff_set_dimensions(s->avctx, s->width, s->height);

  292.         if (ret < 0)

  293.             return ret;

  294.     }

  295.     if ((ret = ff_get_buffer(s->avctx, frame, 0)) < 0) {

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

  297.         return ret;

  298.     }

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

  300.         memcpy(frame->data[1], s->palette, sizeof(s->palette));

  301.     }

  302.     return 0;

  303. }

  304. 

  305. static int tiff_decode_tag(TiffContext *s)

  306. {

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

  308.     int i, start;

  309. 

  310.     if (bytestream2_get_bytes_left(&s->gb) < 12)

  311.         return AVERROR_INVALIDDATA;

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

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

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

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

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

  317. 

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

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

  320.                type);

  321.         return 0;

  322.     }

  323. 

  324.     if (count == 1) {

  325.         switch (type) {

  326.         case TIFF_BYTE:

  327.         case TIFF_SHORT:

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

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

  330.             break;

  331.         case TIFF_LONG:

  332.             value = off;

  333.             break;

  334.         case TIFF_STRING:

  335.             if (count <= 4) {

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

  337.                 break;

  338.             }

  339.         default:

  340.             value = UINT_MAX;

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

  342.         }

  343.     } else {

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

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

  346.         else

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

  348.     }

  349. 

  350.     switch (tag) {

  351.     case TIFF_WIDTH:

  352.         s->width = value;

  353.         break;

  354.     case TIFF_HEIGHT:

  355.         s->height = value;

  356.         break;

  357.     case TIFF_BPP:

  358.         s->bppcount = count;

  359.         if (count > 4) {

  360.             av_log(s->avctx, AV_LOG_ERROR,

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

  362.                    s->bpp, count);

  363.             return AVERROR_INVALIDDATA;

  364.         }

  365.         if (count == 1)

  366.             s->bpp = value;

  367.         else {

  368.             switch (type) {

  369.             case TIFF_BYTE:

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

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

  372.                 break;

  373.             case TIFF_SHORT:

  374.             case TIFF_LONG:

  375.                 s->bpp = 0;

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

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

  378.                 break;

  379.             default:

  380.                 s->bpp = -1;

  381.             }

  382.         }

  383.         break;

  384.     case TIFF_SAMPLES_PER_PIXEL:

  385.         if (count != 1) {

  386.             av_log(s->avctx, AV_LOG_ERROR,

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

  388.             return AVERROR_INVALIDDATA;

  389.         }

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

  391.             s->bpp *= value;

  392.         s->bppcount = value;

  393.         break;

  394.     case TIFF_COMPR:

  395.         s->compr     = value;

  396.         s->predictor = 0;

  397.         switch (s->compr) {

  398.         case TIFF_RAW:

  399.         case TIFF_PACKBITS:

  400.         case TIFF_LZW:

  401.         case TIFF_CCITT_RLE:

  402.             break;

  403.         case TIFF_G3:

  404.         case TIFF_G4:

  405.             s->fax_opts = 0;

  406.             break;

  407.         case TIFF_DEFLATE:

  408.         case TIFF_ADOBE_DEFLATE:

  409. #if CONFIG_ZLIB

  410.             break;

  411. #else

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

  413.             return AVERROR(ENOSYS);

  414. #endif

  415.         case TIFF_JPEG:

  416.         case TIFF_NEWJPEG:

  417.             avpriv_report_missing_feature(s->avctx, "JPEG compression");

  418.             return AVERROR_PATCHWELCOME;

  419.         case TIFF_LZMA:

  420.             avpriv_report_missing_feature(s->avctx, "LZMA compression");

  421.             return AVERROR_PATCHWELCOME;

  422.         default:

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

  424.                    s->compr);

  425.             return AVERROR_INVALIDDATA;

  426.         }

  427.         break;

  428.     case TIFF_ROWSPERSTRIP:

  429.         if (!value || (type == TIFF_LONG && value == UINT_MAX))

  430.             value = s->height;

  431.         s->rps = FFMIN(value, s->height);

  432.         break;

  433.     case TIFF_STRIP_OFFS:

  434.         if (count == 1) {

  435.             s->strippos = 0;

  436.             s->stripoff = value;

  437.         } else

  438.             s->strippos = off;

  439.         s->strips = count;

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

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

  442.         s->sot = type;

  443.         break;

  444.     case TIFF_STRIP_SIZE:

  445.         if (count == 1) {

  446.             s->stripsizesoff = 0;

  447.             s->stripsize     = value;

  448.             s->strips        = 1;

  449.         } else {

  450.             s->stripsizesoff = off;

  451.         }

  452.         s->strips = count;

  453.         s->sstype = type;

  454.         break;

  455.     case TIFF_PREDICTOR:

  456.         s->predictor = value;

  457.         break;

  458.     case TIFF_PHOTOMETRIC:

  459.         switch (value) {

  460.         case TIFF_PHOTOMETRIC_WHITE_IS_ZERO:

  461.         case TIFF_PHOTOMETRIC_BLACK_IS_ZERO:

  462.         case TIFF_PHOTOMETRIC_RGB:

  463.         case TIFF_PHOTOMETRIC_PALETTE:

  464.             s->photometric = value;

  465.             break;

  466.         case TIFF_PHOTOMETRIC_ALPHA_MASK:

  467.         case TIFF_PHOTOMETRIC_SEPARATED:

  468.         case TIFF_PHOTOMETRIC_YCBCR:

  469.         case TIFF_PHOTOMETRIC_CIE_LAB:

  470.         case TIFF_PHOTOMETRIC_ICC_LAB:

  471.         case TIFF_PHOTOMETRIC_ITU_LAB:

  472.         case TIFF_PHOTOMETRIC_CFA:

  473.         case TIFF_PHOTOMETRIC_LOG_L:

  474.         case TIFF_PHOTOMETRIC_LOG_LUV:

  475.         case TIFF_PHOTOMETRIC_LINEAR_RAW:

  476.             avpriv_report_missing_feature(s->avctx,

  477.                                           "PhotometricInterpretation 0x%04X",

  478.                                           value);

  479.             return AVERROR_PATCHWELCOME;

  480.         default:

  481.             av_log(s->avctx, AV_LOG_ERROR, "PhotometricInterpretation %u is "

  482.                    "unknown\n", value);

  483.             return AVERROR_INVALIDDATA;

  484.         }

  485.         break;

  486.     case TIFF_FILL_ORDER:

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

  488.             av_log(s->avctx, AV_LOG_ERROR,

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

  490.             value = 1;

  491.         }

  492.         s->fill_order = value - 1;

  493.         break;

  494.     case TIFF_PAL: {

  495.         GetByteContext pal_gb[3];

  496.         off = type_sizes[type];

  497.         if (count / 3 > 256 ||

  498.             bytestream2_get_bytes_left(&s->gb) < count / 3 * off * 3)

  499.             return AVERROR_INVALIDDATA;

  500.         pal_gb[0] = pal_gb[1] = pal_gb[2] = s->gb;

  501.         bytestream2_skip(&pal_gb[1], count / 3 * off);

  502.         bytestream2_skip(&pal_gb[2], count / 3 * off * 2);

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

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

  505.             uint32_t p = 0xFF000000;

  506.             p |= (tget(&pal_gb[0], type, s->le) >> off) << 16;

  507.             p |= (tget(&pal_gb[1], type, s->le) >> off) << 8;

  508.             p |=  tget(&pal_gb[2], type, s->le) >> off;

  509.             s->palette[i] = p;

  510.         }

  511.         s->palette_is_set = 1;

  512.         break;

  513.     }

  514.     case TIFF_PLANAR:

  515.         if (value == 2) {

  516.             avpriv_report_missing_feature(s->avctx, "Planar format");

  517.             return AVERROR_PATCHWELCOME;

  518.         }

  519.         break;

  520.     case TIFF_T4OPTIONS:

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

  522.             s->fax_opts = value;

  523.         break;

  524.     case TIFF_T6OPTIONS:

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

  526.             s->fax_opts = value;

  527.         break;

  528.     default:

  529.         if (s->avctx->err_recognition & AV_EF_EXPLODE) {

  530.             av_log(s->avctx, AV_LOG_ERROR,

  531.                    "Unknown or unsupported tag %d/0X%0X\n",

  532.                    tag, tag);

  533.             return AVERROR_INVALIDDATA;

  534.         }

  535.     }

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

  537.     return 0;

  538. }

  539. 

  540. static int decode_frame(AVCodecContext *avctx,

  541.                         void *data, int *got_frame, AVPacket *avpkt)

  542. {

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

  544.     AVFrame *const p = data;

  545.     unsigned off;

  546.     int id, le, ret;

  547.     int i, j, entries, stride;

  548.     unsigned soff, ssize;

  549.     uint8_t *dst;

  550.     GetByteContext stripsizes;

  551.     GetByteContext stripdata;

  552. 

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

  554. 

  555.     // parse image header

  556.     if (avpkt->size < 8)

  557.         return AVERROR_INVALIDDATA;

  558.     id = bytestream2_get_le16(&s->gb);

  559.     if (id == 0x4949)

  560.         le = 1;

  561.     else if (id == 0x4D4D)

  562.         le = 0;

  563.     else {

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

  565.         return AVERROR_INVALIDDATA;

  566.     }

  567.     s->le          = le;

  568.     s->photometric = TIFF_PHOTOMETRIC_NONE;

  569.     s->compr       = TIFF_RAW;

  570.     s->fill_order  = 0;

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

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

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

  574.         av_log(avctx, AV_LOG_ERROR,

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

  576.         return AVERROR_INVALIDDATA;

  577.     }

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

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

  580.     /* parse image file directory */

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

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

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

  584.         return AVERROR_INVALIDDATA;

  585.     }

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

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

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

  589.         if ((ret = tiff_decode_tag(s)) < 0)

  590.             return ret;

  591.     }

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

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

  594.         return AVERROR_INVALIDDATA;

  595.     }

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

  597.     if ((ret = init_image(s, p)) < 0)

  598.         return ret;

  599. 

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

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

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

  603.     }

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

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

  606. 

  607.     if (s->stripsizesoff) {

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

  609.             return AVERROR_INVALIDDATA;

  610.         bytestream2_init(&stripsizes, avpkt->data + s->stripsizesoff,

  611.                          avpkt->size - s->stripsizesoff);

  612.     }

  613.     if (s->strippos) {

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

  615.             return AVERROR_INVALIDDATA;

  616.         bytestream2_init(&stripdata, avpkt->data + s->strippos,

  617.                          avpkt->size - s->strippos);

  618.     }

  619. 

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

  621.         if (s->stripsizesoff)

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

  623.         else

  624.             ssize = s->stripsize;

  625. 

  626.         if (s->strippos)

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

  628.         else

  629.             soff = s->stripoff;

  630. 

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

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

  633.             return AVERROR_INVALIDDATA;

  634.         }

  635.         if ((ret = tiff_unpack_strip(s, dst, stride, avpkt->data + soff, ssize,

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

  637.             if (avctx->err_recognition & AV_EF_EXPLODE)

  638.                 return ret;

  639.             break;

  640.         }

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

  642.     }

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

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

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

  646.         ssize = s->width * soff;

  647.         if (s->avctx->pix_fmt == AV_PIX_FMT_RGB48LE) {

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

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

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

  651.                 dst += stride;

  652.             }

  653.         } else if (s->avctx->pix_fmt == AV_PIX_FMT_RGB48BE) {

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

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

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

  657.                 dst += stride;

  658.             }

  659.         } else {

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

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

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

  663.                 dst += stride;

  664.             }

  665.         }

  666.     }

  667. 

  668.     if (s->photometric == TIFF_PHOTOMETRIC_WHITE_IS_ZERO) {

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

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

  671.             for (j = 0; j < p->linesize[0]; j++)

  672.                 dst[j] = 255 - dst[j];

  673.             dst += stride;

  674.         }

  675.     }

  676.     *got_frame = 1;

  677. 

  678.     return avpkt->size;

  679. }

  680. 

  681. static av_cold int tiff_init(AVCodecContext *avctx)

  682. {

  683.     TiffContext *s = avctx->priv_data;

  684. 

  685.     s->width  = 0;

  686.     s->height = 0;

  687.     s->avctx  = avctx;

  688.     ff_lzw_decode_open(&s->lzw);

  689.     ff_ccitt_unpack_init();

  690. 

  691.     return 0;

  692. }

  693. 

  694. static av_cold int tiff_end(AVCodecContext *avctx)

  695. {

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

  697. 

  698.     ff_lzw_decode_close(&s->lzw);

  699.     return 0;

  700. }

  701. 

  702. AVCodec ff_tiff_decoder = {

  703.     .name           = "tiff",

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

  705.     .type           = AVMEDIA_TYPE_VIDEO,

  706.     .id             = AV_CODEC_ID_TIFF,

  707.     .priv_data_size = sizeof(TiffContext),

  708.     .init           = tiff_init,

  709.     .close          = tiff_end,

  710.     .decode         = decode_frame,

  711.     .capabilities   = CODEC_CAP_DR1,

  712. };