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

  252.     case 11:

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

  254.         break;

  255.     case 81:

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

  257.         break;

  258.     case 243:

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

  260.         break;

  261.     case 161:

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

  263.         break;

  264.     case 162:

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

  266.         break;

  267.     case 322:

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

  269.         break;

  270.     case 324:

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

  272.         break;

  273.     case 483:

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

  275.         break;

  276.     default:

  277.         av_log(s->avctx, AV_LOG_ERROR,

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

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

  280.         return AVERROR_INVALIDDATA;

  281.     }

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

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

  284.         if (ret < 0)

  285.             return ret;

  286.     }

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

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

  289.         return ret;

  290.     }

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

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

  293.     }

  294.     return 0;

  295. }

  296. 

  297. static int tiff_decode_tag(TiffContext *s)

  298. {

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

  300.     int i, start;

  301. 

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

  303.         return AVERROR_INVALIDDATA;

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

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

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

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

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

  309. 

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

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

  312.                type);

  313.         return 0;

  314.     }

  315. 

  316.     if (count == 1) {

  317.         switch (type) {

  318.         case TIFF_BYTE:

  319.         case TIFF_SHORT:

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

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

  322.             break;

  323.         case TIFF_LONG:

  324.             value = off;

  325.             break;

  326.         case TIFF_STRING:

  327.             if (count <= 4) {

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

  329.                 break;

  330.             }

  331.         default:

  332.             value = UINT_MAX;

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

  334.         }

  335.     } else {

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

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

  338.         else

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

  340.     }

  341. 

  342.     switch (tag) {

  343.     case TIFF_WIDTH:

  344.         s->width = value;

  345.         break;

  346.     case TIFF_HEIGHT:

  347.         s->height = value;

  348.         break;

  349.     case TIFF_BPP:

  350.         s->bppcount = count;

  351.         if (count > 4) {

  352.             av_log(s->avctx, AV_LOG_ERROR,

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

  354.                    s->bpp, count);

  355.             return AVERROR_INVALIDDATA;

  356.         }

  357.         if (count == 1)

  358.             s->bpp = value;

  359.         else {

  360.             switch (type) {

  361.             case TIFF_BYTE:

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

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

  364.                 break;

  365.             case TIFF_SHORT:

  366.             case TIFF_LONG:

  367.                 s->bpp = 0;

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

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

  370.                 break;

  371.             default:

  372.                 s->bpp = -1;

  373.             }

  374.         }

  375.         break;

  376.     case TIFF_SAMPLES_PER_PIXEL:

  377.         if (count != 1) {

  378.             av_log(s->avctx, AV_LOG_ERROR,

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

  380.             return AVERROR_INVALIDDATA;

  381.         }

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

  383.             s->bpp *= value;

  384.         s->bppcount = value;

  385.         break;

  386.     case TIFF_COMPR:

  387.         s->compr     = value;

  388.         s->predictor = 0;

  389.         switch (s->compr) {

  390.         case TIFF_RAW:

  391.         case TIFF_PACKBITS:

  392.         case TIFF_LZW:

  393.         case TIFF_CCITT_RLE:

  394.             break;

  395.         case TIFF_G3:

  396.         case TIFF_G4:

  397.             s->fax_opts = 0;

  398.             break;

  399.         case TIFF_DEFLATE:

  400.         case TIFF_ADOBE_DEFLATE:

  401. #if CONFIG_ZLIB

  402.             break;

  403. #else

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

  405.             return AVERROR(ENOSYS);

  406. #endif

  407.         case TIFF_JPEG:

  408.         case TIFF_NEWJPEG:

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

  410.             return AVERROR_PATCHWELCOME;

  411.         case TIFF_LZMA:

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

  413.             return AVERROR_PATCHWELCOME;

  414.         default:

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

  416.                    s->compr);

  417.             return AVERROR_INVALIDDATA;

  418.         }

  419.         break;

  420.     case TIFF_ROWSPERSTRIP:

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

  422.             value = s->height;

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

  424.         break;

  425.     case TIFF_STRIP_OFFS:

  426.         if (count == 1) {

  427.             s->strippos = 0;

  428.             s->stripoff = value;

  429.         } else

  430.             s->strippos = off;

  431.         s->strips = count;

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

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

  434.         s->sot = type;

  435.         break;

  436.     case TIFF_STRIP_SIZE:

  437.         if (count == 1) {

  438.             s->stripsizesoff = 0;

  439.             s->stripsize     = value;

  440.             s->strips        = 1;

  441.         } else {

  442.             s->stripsizesoff = off;

  443.         }

  444.         s->strips = count;

  445.         s->sstype = type;

  446.         break;

  447.     case TIFF_PREDICTOR:

  448.         s->predictor = value;

  449.         break;

  450.     case TIFF_PHOTOMETRIC:

  451.         switch (value) {

  452.         case TIFF_PHOTOMETRIC_WHITE_IS_ZERO:

  453.         case TIFF_PHOTOMETRIC_BLACK_IS_ZERO:

  454.         case TIFF_PHOTOMETRIC_RGB:

  455.         case TIFF_PHOTOMETRIC_PALETTE:

  456.             s->photometric = value;

  457.             break;

  458.         case TIFF_PHOTOMETRIC_ALPHA_MASK:

  459.         case TIFF_PHOTOMETRIC_SEPARATED:

  460.         case TIFF_PHOTOMETRIC_YCBCR:

  461.         case TIFF_PHOTOMETRIC_CIE_LAB:

  462.         case TIFF_PHOTOMETRIC_ICC_LAB:

  463.         case TIFF_PHOTOMETRIC_ITU_LAB:

  464.         case TIFF_PHOTOMETRIC_CFA:

  465.         case TIFF_PHOTOMETRIC_LOG_L:

  466.         case TIFF_PHOTOMETRIC_LOG_LUV:

  467.         case TIFF_PHOTOMETRIC_LINEAR_RAW:

  468.             avpriv_report_missing_feature(s->avctx,

  469.                                           "PhotometricInterpretation 0x%04X",

  470.                                           value);

  471.             return AVERROR_PATCHWELCOME;

  472.         default:

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

  474.                    "unknown\n", value);

  475.             return AVERROR_INVALIDDATA;

  476.         }

  477.         break;

  478.     case TIFF_FILL_ORDER:

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

  480.             av_log(s->avctx, AV_LOG_ERROR,

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

  482.             value = 1;

  483.         }

  484.         s->fill_order = value - 1;

  485.         break;

  486.     case TIFF_PAL: {

  487.         GetByteContext pal_gb[3];

  488.         off = type_sizes[type];

  489.         if (count / 3 > 256 ||

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

  491.             return AVERROR_INVALIDDATA;

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

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

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

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

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

  497.             uint32_t p = 0xFF000000;

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

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

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

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

  502.         }

  503.         s->palette_is_set = 1;

  504.         break;

  505.     }

  506.     case TIFF_PLANAR:

  507.         if (value == 2) {

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

  509.             return AVERROR_PATCHWELCOME;

  510.         }

  511.         break;

  512.     case TIFF_T4OPTIONS:

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

  514.             s->fax_opts = value;

  515.         break;

  516.     case TIFF_T6OPTIONS:

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

  518.             s->fax_opts = value;

  519.         break;

  520.     default:

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

  522.             av_log(s->avctx, AV_LOG_ERROR,

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

  524.                    tag, tag);

  525.             return AVERROR_INVALIDDATA;

  526.         }

  527.     }

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

  529.     return 0;

  530. }

  531. 

  532. static int decode_frame(AVCodecContext *avctx,

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

  534. {

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

  536.     AVFrame *const p = data;

  537.     unsigned off;

  538.     int id, le, ret;

  539.     int i, j, entries, stride;

  540.     unsigned soff, ssize;

  541.     uint8_t *dst;

  542.     GetByteContext stripsizes;

  543.     GetByteContext stripdata;

  544. 

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

  546. 

  547.     // parse image header

  548.     if (avpkt->size < 8)

  549.         return AVERROR_INVALIDDATA;

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

  551.     if (id == 0x4949)

  552.         le = 1;

  553.     else if (id == 0x4D4D)

  554.         le = 0;

  555.     else {

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

  557.         return AVERROR_INVALIDDATA;

  558.     }

  559.     s->le          = le;

  560.     s->photometric = TIFF_PHOTOMETRIC_NONE;

  561.     s->compr       = TIFF_RAW;

  562.     s->fill_order  = 0;

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

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

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

  566.         av_log(avctx, AV_LOG_ERROR,

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

  568.         return AVERROR_INVALIDDATA;

  569.     }

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

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

  572.     /* parse image file directory */

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

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

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

  576.         return AVERROR_INVALIDDATA;

  577.     }

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

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

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

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

  582.             return ret;

  583.     }

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

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

  586.         return AVERROR_INVALIDDATA;

  587.     }

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

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

  590.         return ret;

  591. 

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

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

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

  595.     }

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

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

  598. 

  599.     if (s->stripsizesoff) {

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

  601.             return AVERROR_INVALIDDATA;

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

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

  604.     }

  605.     if (s->strippos) {

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

  607.             return AVERROR_INVALIDDATA;

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

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

  610.     }

  611. 

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

  613.         if (s->stripsizesoff)

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

  615.         else

  616.             ssize = s->stripsize;

  617. 

  618.         if (s->strippos)

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

  620.         else

  621.             soff = s->stripoff;

  622. 

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

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

  625.             return AVERROR_INVALIDDATA;

  626.         }

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

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

  629.             if (avctx->err_recognition & AV_EF_EXPLODE)

  630.                 return ret;

  631.             break;

  632.         }

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

  634.     }

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

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

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

  638.         ssize = s->width * soff;

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

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

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

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

  643.                 dst += stride;

  644.             }

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

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

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

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

  649.                 dst += stride;

  650.             }

  651.         } else {

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

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

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

  655.                 dst += stride;

  656.             }

  657.         }

  658.     }

  659. 

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

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

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

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

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

  665.             dst += stride;

  666.         }

  667.     }

  668.     *got_frame = 1;

  669. 

  670.     return avpkt->size;

  671. }

  672. 

  673. static av_cold int tiff_init(AVCodecContext *avctx)

  674. {

  675.     TiffContext *s = avctx->priv_data;

  676. 

  677.     s->width  = 0;

  678.     s->height = 0;

  679.     s->avctx  = avctx;

  680.     ff_lzw_decode_open(&s->lzw);

  681.     ff_ccitt_unpack_init();

  682. 

  683.     return 0;

  684. }

  685. 

  686. static av_cold int tiff_end(AVCodecContext *avctx)

  687. {

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

  689. 

  690.     ff_lzw_decode_close(&s->lzw);

  691.     return 0;

  692. }

  693. 

  694. AVCodec ff_tiff_decoder = {

  695.     .name           = "tiff",

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

  697.     .type           = AVMEDIA_TYPE_VIDEO,

  698.     .id             = AV_CODEC_ID_TIFF,

  699.     .priv_data_size = sizeof(TiffContext),

  700.     .init           = tiff_init,

  701.     .close          = tiff_end,

  702.     .decode         = decode_frame,

  703.     .capabilities   = CODEC_CAP_DR1,

  704. };