exiv2/src/asfvideo.cpp

// ***************************************************************** -*- C++ -*-
/*
 * Copyright (C) 2004-2021 Exiv2 authors
 * This program is part of the Exiv2 distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
 */
/*
  File:      asfvideo.cpp
  Author(s): Abhinav Badola for GSoC 2012 (AB) <mail.abu.to@gmail.com>
  History:   08-Aug-12, AB: created
  Credits:   See header file
 */
// *****************************************************************************
// included header files
#include <iostream>
#include "config.h"

//#ifdef EXV_ENABLE_VIDEO
#include "asfvideo.hpp"
#include "basicio.hpp"
#include "convert.hpp"
#include "error.hpp"
#include "futils.hpp"
#include "helper_functions.hpp"
#include "tags.hpp"
#include "tags_int.hpp"
#include "types.hpp"

// + standard includes
#include <ctype.h>
#include <cassert>
#include <cstring>

// *****************************************************************************
// class member definitions
namespace Exiv2::Internal {

/*!
  TagVocabulary Look-up list for ASF Type Video Files
  Associates the GUID of a TagVocabulary with its TagVocabulary Name(i.e. Human Readable Form)
  Tags have been diferentiated into Various Categories.
  The categories have been listed above the TagVocabulary Groups
  see :
  - https://fr.wikipedia.org/wiki/Advanced_Systems_Format
  - https://exse.eyewated.com/fls/54b3ed95bbfb1a92.pdf
 */
constexpr const TagVocabulary GUIDReferenceTags[] = {
    /// Top-level ASF object GUIDS
    {"75B22630-668E-11CF-A6D9-00AA0062CE6C", "Header"},
    {"75B22636-668E-11CF-A6D9-00AA0062CE6C", "Data"},
    {"33000890-E5B1-11CF-89F4-00A0C90349CB", "Simple_Index"},
    {"D6E229D3-35DA-11D1-9034-00A0C90349BE", "Index"},
    {"FEB103F8-12AD-4C64-840F-2A1D2F7AD48C", "Media_Index"},
    {"3CB73FD0-0C4A-4803-953D-EDF7B6228F0C", "Timecode_Index"},

    /// Header Object GUIDs
    {"8CABDCA1-A947-11CF-8EE4-00C00C205365", "File_Properties"},
    {"B7DC0791-A9B7-11CF-8EE6-00C00C205365", "Stream_Properties"},
    {"5FBF03B5-A92E-11CF-8EE3-00C00C205365", "Header_Extension"},
    {"86D15240-311D-11D0-A3A4-00A0C90348F6", "Codec_List"},
    {"1EFB1A30-0B62-11D0-A39B-00A0C90348F6", "Script_Command"},
    {"F487CD01-A951-11CF-8EE6-00C00C205365", "Marker"},
    {"D6E229DC-35DA-11D1-9034-00A0C90349BE", "Bitrate_Mutual_Exclusion"},
    {"75B22635-668E-11CF-A6D9-00AA0062CE6C", "Error_Correction"},
    {"75B22633-668E-11CF-A6D9-00AA0062CE6C", "Content_Description"},
    {"D2D0A440-E307-11D2-97F0-00A0C95EA850", "Extended_Content_Description"},
    {"2211B3FA-BD23-11D2-B4B7-00A0C955FC6E", "Content_Branding"},
    {"7BF875CE-468D-11D1-8D82-006097C9A2B2", "Stream_Bitrate_Properties"},
    {"2211B3FB-BD23-11D2-B4B7-00A0C955FC6E", "Content_Encryption"},
    {"298AE614-2622-4C17-B935-DAE07EE9289C", "Extended_Content_Encryption"},
    {"2211B3FC-BD23-11D2-B4B7-00A0C955FC6E", "Digital_Signature"},
    {"1806D474-CADF-4509-A4BA-9AABCB96AAE8", "Padding"},

    /// Header Extension Object GUIDs
    {"14E6A5CB-C672-4332-8399-A96952065B5A", "Extended_Stream_Properties"},
    {"A08649CF-4775-4670-8A16-6E35357566CD", "Advanced_Mutual_Exclusion"},
    {"D1465A40-5A79-4338-B71B-E36B8FD6C249", "Group_Mutual_Exclusion"},
    {"D4FED15B-88D3-454F-81F0-ED5C45999E24", "Stream_Prioritization"},
    {"A69609E6-517B-11D2-B6AF-00C04FD908E9", "Bandwidth_Sharing"},
    {"7C4346A9-EFE0-4BFC-B229-393EDE415C85", "Language_List"},
    {"C5F8CBEA-5BAF-4877-8467-AA8C44FA4CCA", "Metadata"},
    {"44231C94-9498-49D1-A141-1D134E457054", "Metadata_Library"},
    {"D6E229DF-35DA-11D1-9034-00A0C90349BE", "Index_Parameters"},
    {"6B203BAD-3F11-48E4-ACA8-D7613DE2CFA7", "Media_Index_Parameters"},
    {"F55E496D-9797-4B5D-8C8B-604DFE9BFB24", "Timecode_Index_Parameters"},
    {"26F18B5D-4584-47EC-9F5F-0E651F0452C9", "Compatibility"},
    {"43058533-6981-49E6-9B74-AD12CB86D58C", "Advanced_Content_Encryption"},

    /// Stream Properties Object Stream Type GUIDs
    {"F8699E40-5B4D-11CF-A8FD-00805F5C442B", "Audio_Media"},
    {"BC19EFC0-5B4D-11CF-A8FD-00805F5C442B", "Video_Media"},
    {"59DACFC0-59E6-11D0-A3AC-00A0C90348F6", "Command_Media"},
    {"B61BE100-5B4E-11CF-A8FD-00805F5C442B", "JFIF_Media"},
    {"35907DE0-E415-11CF-A917-00805F5C442B", "Degradable_JPEG_Media"},
    {"91BD222C-F21C-497A-8B6D-5AA86BFC0185", "File_Transfer_Media"},
    {"3AFB65E2-47EF-40F2-AC2C-70A90D71D343", "Binary_Media"},

    /// Web stream Type-Specific Data GUIDs
    {"776257D4-C627-41CB-8F81-7AC7FF1C40CC", "Web_Stream_Media_Subtype"},
    {"DA1E6B13-8359-4050-B398-388E965BF00C", "Web_Stream_Format"},

    /// Stream Properties Object Error Correction Type GUIDs
    {"20FB5700-5B55-11CF-A8FD-00805F5C442B", "No_Error_Correction"},
    {"BFC3CD50-618F-11CF-8BB2-00AA00B4E220", "Audio_Spread"},

    /// Header Extension Object GUIDs
    {"ABD3D211-A9BA-11cf-8EE6-00C00C205365", "Reserved_1"},

    /// Advanced Content Encryption Object System ID GUIDs
    {"7A079BB6-DAA4-4e12-A5CA-91D38DC11A8D", "Content_Encryption_System_Windows_Media_DRM_Network_Devices"},

    /// Codec List Object GUIDs
    {"86D15241-311D-11D0-A3A4-00A0C90348F6", "Reserved_2"},

    /// Script Command Object GUIDs
    {"4B1ACBE3-100B-11D0-A39B-00A0C90348F6", "Reserved_3"},

    /// Marker Object GUIDs
    {"4CFEDB20-75F6-11CF-9C0F-00A0C90349CB", "Reserved_4"},

    /// Mutual Exclusion Object Exclusion Type GUIDs
    {"D6E22A00-35DA-11D1-9034-00A0C90349BE", "Mutex_Language"},
    {"D6E22A01-35DA-11D1-9034-00A0C90349BE", "Mutex_Bitrate"},
    {"D6E22A02-35DA-11D1-9034-00A0C90349BE", "Mutex_Unknown"},

    /// Bandwidth Sharing Object GUIDs
    {"AF6060AA-5197-11D2-B6AF-00C04FD908E9", "Bandwidth_Sharing_Exclusive"},
    {"AF6060AB-5197-11D2-B6AF-00C04FD908E9", "Bandwidth_Sharing_Partial"},

    /// Standard Payload Extension System GUIDs
    {"399595EC-8667-4E2D-8FDB-98814CE76C1E", "Payload_Extension_System_Timecode"},
    {"E165EC0E-19ED-45D7-B4A7-25CBD1E28E9B", "Payload_Extension_System_File_Name"},
    {"D590DC20-07BC-436C-9CF7-F3BBFBF1A4DC", "Payload_Extension_System_Content_Type"},
    {"1B1EE554-F9EA-4BC8-821A-376B74E4C4B8", "Payload_Extension_System_Pixel_Aspect_Ratio"},
    {"C6BD9450-867F-4907-83A3-C77921B733AD", "Payload_Extension_System_Sample_Duration"},
    {"6698B84E-0AFA-4330-AEB2-1C0A98D7A44D", "Payload_Extension_System_Encryption_Sample_ID"},
    {"00E1AF06-7BEC-11D1-A582-00C04FC29CFB", "Payload_Extension_System_Degradable_JPEG"}};

constexpr const TagDetails filePropertiesTags[] = {{7, "Xmp.video.FileLength"},   {6, "Xmp.video.CreationDate"},
                                                   {5, "Xmp.video.DataPackets"},  {4, "Xmp.video.Duration"},
                                                   {3, "Xmp.video.SendDuration"}, {2, "Xmp.video.Preroll"},
                                                   {1, "Xmp.video.MaxBitRate"}};

constexpr const TagDetails contentDescriptionTags[] = {{0, "Xmp.video.Title"},
                                                       {1, "Xmp.video.Author"},
                                                       {2, "Xmp.video.Copyright"},
                                                       {3, "Xmp.video.Description"},
                                                       {4, "Xmp.video.Rating"}};

/*!
  @brief Function used to check equality of two Tags (ignores case).
  @param str1 char* Pointer to First TagVocabulary
  @param str2 char* Pointer to Second TagVocabulary
  @return Returns true if both are equal.
 */
bool compareTag(const char* str1, const char* str2) {
  if (strlen(str1) != strlen(str2))
    return false;

  for (uint64_t i = 0; i < strlen(str1); ++i)
    if (tolower(str1[i]) != tolower(str2[i]))
      return false;

  return true;
}

/*!
  @brief Function used to calculate GUID, Tags comprises of 16 bytes.
      The Buffer contains the TagVocabulary in Binary Form. The information is then
      parsed into a character array GUID.
 */
void getGUID(byte buf[], char GUID[]) {
  int i;
  for (i = 0; i < 4; ++i) {
    GUID[(3 - i) * 2] = Util::returnHEX(buf[i] / 0x10);
    GUID[(3 - i) * 2 + 1] = Util::returnHEX(buf[i] % 0x10);
  }
  for (i = 4; i < 6; ++i) {
    GUID[(9 - i) * 2 + 1] = Util::returnHEX(buf[i] / 0x10);
    GUID[(9 - i) * 2 + 2] = Util::returnHEX(buf[i] % 0x10);
  }
  for (i = 6; i < 8; ++i) {
    GUID[(14 - i) * 2] = Util::returnHEX(buf[i] / 0x10);
    GUID[(14 - i) * 2 + 1] = Util::returnHEX(buf[i] % 0x10);
  }
  for (i = 8; i < 10; ++i) {
    GUID[i * 2 + 3] = Util::returnHEX(buf[i] / 0x10);
    GUID[i * 2 + 4] = Util::returnHEX(buf[i] % 0x10);
  }
  for (i = 10; i < 16; ++i) {
    GUID[i * 2 + 4] = Util::returnHEX(buf[i] / 0x10);
    GUID[i * 2 + 5] = Util::returnHEX(buf[i] % 0x10);
  }
  GUID[36] = '\0';
  GUID[8] = GUID[13] = GUID[18] = GUID[23] = '-';
}

/*!
  @brief Function used to check if data stored in buf is equivalent to
      ASF Header TagVocabulary's GUID.
  @param buf Exiv2 byte buffer
  @return Returns true if the buffer data is equivalent to Header GUID.
 */
bool isASFType(byte buf[]) {
  if (buf[0] == 0x30 && buf[1] == 0x26 && buf[2] == 0xb2 && buf[3] == 0x75 && buf[4] == 0x8e && buf[5] == 0x66 &&
      buf[6] == 0xcf && buf[7] == 0x11 && buf[8] == 0xa6 && buf[9] == 0xd9 && buf[10] == 0x00 && buf[11] == 0xaa &&
      buf[12] == 0x00 && buf[13] == 0x62 && buf[14] == 0xce && buf[15] == 0x6c)
    return true;

  return false;
}

}  // namespace Exiv2::Internal

namespace Exiv2 {

using namespace Exiv2::Internal;

AsfVideo::AsfVideo(BasicIo::UniquePtr io) : Image(ImageType::asf, mdNone, std::move(io)) {
}  // AsfVideo::AsfVideo

std::string AsfVideo::mimeType() const {
  return "video/asf";
}

void AsfVideo::writeMetadata() {
}

void AsfVideo::readMetadata() {
  if (io_->open() != 0)
    throw Error(ErrorCode::kerDataSourceOpenFailed, io_->path(), strError());

  // Ensure that this is the correct image type
  if (!isAsfType(*io_, false)) {
    if (io_->error() || io_->eof())
      throw Error(ErrorCode::kerFailedToReadImageData);
    throw Error(ErrorCode::kerNotAnImage, "ASF");
  }

  IoCloser closer(*io_);
  clearMetadata();
  continueTraversing_ = true;
  io_->seek(0, BasicIo::beg);
  height_ = width_ = 1;

  xmpData()["Xmp.video.FileSize"] = io_->size() / 1048576.;
  xmpData()["Xmp.video.FileName"] = io_->path();
  xmpData()["Xmp.video.MimeType"] = mimeType();

  while (continueTraversing_)
    decodeBlock();

  aspectRatio();
}  // AsfVideo::readMetadata

void AsfVideo::decodeBlock() {
  DataBuf buf(BUFF_MIN_SIZE + 1);
  uint64_t size = 0;
  const Internal::TagVocabulary* tv;
  uint64_t cur_pos = io_->tell();

  byte guidBuf[GUI_SIZE];
  io_->read(guidBuf, GUI_SIZE);

  if (io_->eof()) {
    continueTraversing_ = false;
    return;
  }

  char GUID[GUID_SIZE] = "";  // the getGUID function write the GUID[36],

  getGUID(guidBuf, GUID);
  tv = find(GUIDReferenceTags, GUID);

  io_->read(buf.data(), BUFF_MIN_SIZE);
  size = Util::getUint64_t(buf);

  if (tv) {
    auto tagDecoder = [&](const Internal::TagVocabulary* tv, uint64_t size) {
      uint64_t cur_pos = io_->tell();
      DataBuf buf(1000);
      unsigned long count = 0, tempLength = 0;
      Exiv2::Value::UniquePtr v = Exiv2::Value::create(Exiv2::xmpSeq);

      if (compareTag(exvGettext(tv->label_), "Header")) {
        localPosition_ = 0;
        io_->read(buf.data(), 4);
        io_->read(buf.data(), 2);

        while (localPosition_ < cur_pos + size)
          decodeBlock();
      }

      else if (compareTag(exvGettext(tv->label_), "File_Properties"))
        fileProperties();

      else if (compareTag(exvGettext(tv->label_), "Stream_Properties"))
        streamProperties();

      else if (compareTag(exvGettext(tv->label_), "Metadata"))
        metadataHandler(1);

      else if (compareTag(exvGettext(tv->label_), "Extended_Content_Description"))
        metadataHandler(2);

      else if (compareTag(exvGettext(tv->label_), "Metadata_Library"))
        metadataHandler(3);

      else if (compareTag(exvGettext(tv->label_), "Codec_List"))
        codecList();

      else if (compareTag(exvGettext(tv->label_), "Content_Description"))
        contentDescription(size);

      else if (compareTag(exvGettext(tv->label_), "Extended_Stream_Properties"))
        extendedStreamProperties(size);

      else if (compareTag(exvGettext(tv->label_), "Header_Extension")) {
        localPosition_ = 0;
        headerExtension(size);
      }

      else if (compareTag(exvGettext(tv->label_), "Language_List")) {
        std::memset(buf.data(), 0x0, buf.size());
        io_->read(buf.data(), 2);
        count = Exiv2::getUShort(buf.data(), littleEndian);

        while (count--) {
          std::memset(buf.data(), 0x0, buf.size());
          io_->read(buf.data(), 1);
          tempLength = (int)buf.data()[0];

          io_->read(buf.data(), tempLength);
          v->read(Util::toString16(buf));
        }
        xmpData().add(Exiv2::XmpKey("Xmp.video.TrackLang"), v.get());
      }

      io_->seek(cur_pos + size, BasicIo::beg);
      localPosition_ = io_->tell();
    };  // AsfVideo::tagDecoder

    tagDecoder(tv, size - 24);
  } else
    io_->seek(cur_pos + size, BasicIo::beg);

  localPosition_ = io_->tell();
}  // AsfVideo::decodeBlock

void AsfVideo::extendedStreamProperties(uint64_t size) {
  uint64_t cur_pos = io_->tell(), avgTimePerFrame = 0;
  DataBuf buf(BUFF_MIN_SIZE);
  static int previousStream;
  io_->seek(cur_pos + 48, BasicIo::beg);

  io_->read(buf.data(), 2);
  streamNumber_ = Exiv2::getUShort(buf.data(), littleEndian);

  io_->read(buf.data(), 2);
  io_->read(buf.data(), BUFF_MIN_SIZE);
  avgTimePerFrame = Util::getUint64_t(buf);

  if (previousStream < streamNumber_ && avgTimePerFrame != 0)
    xmpData()["Xmp.video.FrameRate"] = 10000000. / avgTimePerFrame;

  previousStream = streamNumber_;
  io_->seek(cur_pos + size, BasicIo::beg);
}  // AsfVideo::extendedStreamProperties

void AsfVideo::contentDescription(uint64_t size) {
  const size_t pos = io_->tell();
  size_t length[5];
  for (int i = 0; i < 5; ++i) {
    byte buf[2];
    io_->read(buf, 2);
    if (io_->error() || io_->eof())
      throw Error(ErrorCode::kerFailedToReadImageData);
    length[i] = getUShort(buf, littleEndian);
  }
  for (int i = 0; i < 5; ++i) {
    DataBuf buf(length[i]);
    std::memset(buf.data(), 0x0, buf.size());
    io_->read(buf.data(), length[i]);
    if (io_->error() || io_->eof())
      throw Error(ErrorCode::kerFailedToReadImageData);
    const TagDetails* td = find(contentDescriptionTags, i);
    assert(td);
    std::string str((const char*)buf.data(), length[i]);
    if (convertStringCharset(str, "UCS-2LE", "UTF-8")) {
      xmpData()[td->label_] = str;
    } else {
      xmpData()[td->label_] = Util::toString16(buf);
    }
  }
  if (io_->seek(pos + size, BasicIo::beg))
    throw Error(ErrorCode::kerFailedToReadImageData);
}  // AsfVideo::contentDescription

void AsfVideo::streamProperties() {
  DataBuf buf(20);
  byte guidBuf[GUI_SIZE];
  int stream = 0;
  enum streamTypeInfo { Audio = 1, Video = 2 };
  io_->read(guidBuf, GUI_SIZE);
  char streamType[GUID_SIZE] = "";

  getGUID(guidBuf, streamType);
  const TagVocabulary* tv;
  tv = find(GUIDReferenceTags, streamType);
  io_->read(guidBuf, GUI_SIZE);

  if (compareTag(exvGettext(tv->label_), "Audio_Media"))
    stream = Audio;
  else if (compareTag(exvGettext(tv->label_), "Video_Media"))
    stream = Video;

  io_->read(buf.data(), BUFF_MIN_SIZE);
  if (stream == Video)
    xmpData()["Xmp.video.TimeOffset"] = Util::getUint64_t(buf);
  else if (stream == Audio)
    xmpData()["Xmp.audio.TimeOffset"] = Util::getUint64_t(buf);

  io_->read(buf.data(), BUFF_MIN_SIZE);
  std::memset(buf.data(), 0x0, buf.size());
  io_->read(buf.data(), 1);
  streamNumber_ = (int)buf.data()[0] & 127;

  io_->read(buf.data(), 5);
  std::memset(buf.data(), 0x0, buf.size());
  io_->read(buf.data(), 2);
  size_t temp = Exiv2::getUShort(buf.data(), littleEndian);

  if (stream == 2) {
    xmpData()["Xmp.video.Width"] = temp;
    width_ = temp;
  } else if (stream == Audio) {
    // todo xmpData()["Xmp.audio.Codec"]
  }

  io_->read(buf.data(), 2);
  temp = Exiv2::getUShort(buf.data(), littleEndian);
  if (stream == Audio)
    xmpData()["Xmp.audio.ChannelType"] = temp;

  io_->read(buf.data(), 4);
  temp = Exiv2::getULong(buf.data(), littleEndian);

  if (stream == Video) {
    xmpData()["Xmp.video.Height"] = temp;
    height_ = temp;
  } else if (stream == Audio) {
    xmpData()["Xmp.audio.SampleRate"] = temp;
  }
}  // AsfVideo::streamProperties

void AsfVideo::codecList() {
  DataBuf buf(200);
  io_->read(buf.data(), GUI_SIZE);
  std::memset(buf.data(), 0x0, buf.size());
  io_->read(buf.data(), 4);
  int codecCount = Exiv2::getULong(buf.data(), littleEndian), descLength = 0, codecType = 0;

  while (codecCount--) {
    std::memset(buf.data(), 0x0, buf.size());
    io_->read(buf.data(), 2);
    codecType = Exiv2::getUShort(buf.data(), littleEndian);

    io_->read(buf.data(), 2);
    descLength = Exiv2::getUShort(buf.data(), littleEndian) * 2;

    io_->read(buf.data(), descLength);
    if (codecType == 1)
      xmpData()["Xmp.video.Codec"] = Util::toString16(buf);
    else if (codecType == 2)
      xmpData()["Xmp.audio.Compressor"] = Util::toString16(buf);

    std::memset(buf.data(), 0x0, buf.size());
    io_->read(buf.data(), 2);
    descLength = Exiv2::getUShort(buf.data(), littleEndian) * 2;

    io_->read(buf.data(), descLength);

    if (codecType == 1)
      xmpData()["Xmp.video.CodecDescription"] = Util::toString16(buf);
    else if (codecType == 2)
      xmpData()["Xmp.audio.CodecDescription"] = Util::toString16(buf);

    std::memset(buf.data(), 0x0, buf.size());
    io_->read(buf.data(), 2);
    descLength = Exiv2::getUShort(buf.data(), littleEndian);

    io_->read(buf.data(), descLength);
  }
}  // AsfVideo::codecList

void AsfVideo::headerExtension(uint64_t size) {
  uint64_t cur_pos = io_->tell();
  DataBuf buf(20);
  io_->read(buf.data(), 18);
  buf.data()[4] = '\0';
  io_->read(buf.data(), 4);

  while (localPosition_ < cur_pos + size)
    decodeBlock();

  io_->seek(cur_pos + size, BasicIo::beg);
}  // AsfVideo::headerExtension

void AsfVideo::metadataHandler(int meta) {
  DataBuf buf(5000);
  io_->read(buf.data(), 2);
  uint16_t recordCount = Exiv2::getUShort(buf.data(), littleEndian), nameLength = 0, dataLength = 0, dataType = 0;
  Exiv2::Value::UniquePtr v = Exiv2::Value::create(Exiv2::xmpSeq);
  byte guidBuf[GUI_SIZE];
  char fileID[GUID_SIZE] = "";

  while (recordCount--) {
    std::memset(buf.data(), 0x0, buf.size());

    if (meta == 1 || meta == 3) {
      io_->read(buf.data(), 4);
      io_->read(buf.data(), 2);
      nameLength = Exiv2::getUShort(buf.data(), littleEndian);
      io_->read(buf.data(), 2);
      dataType = Exiv2::getUShort(buf.data(), littleEndian);
      io_->read(buf.data(), 4);
      dataLength = Exiv2::getULong(buf.data(), littleEndian);

      if (nameLength > 5000) {
#ifndef SUPPRESS_WARNINGS
        EXV_ERROR << "Xmp.video.Metadata nameLength was found to be larger than 5000 "
                  << " entries considered invalid; not read.\n";
#endif
        io_->seek(io_->tell() + nameLength, BasicIo::beg);
      } else {
        io_->read(buf.data(), nameLength);
      }

      v->read(Util::toString16(buf));
      if (dataType == 6) {
        io_->read(guidBuf, GUI_SIZE);
        getGUID(guidBuf, fileID);
      } else
          // Sanity check with an "unreasonably" large number
          if (dataLength > 5000) {
#ifndef SUPPRESS_WARNINGS
        EXV_ERROR << "Xmp.video.Metadata dataLength was found to be larger than 5000 "
                  << " entries considered invalid; not read.\n";
#endif
        io_->seek(io_->tell() + dataLength, BasicIo::beg);
      } else
        io_->read(buf.data(), dataLength);
    }

    else if (meta == 2) {
      io_->read(buf.data(), 2);
      nameLength = Exiv2::getUShort(buf.data(), littleEndian);

      if (nameLength > 5000) {
#ifndef SUPPRESS_WARNINGS
        EXV_ERROR << "Xmp.video.Metadata nameLength was found to be larger than 5000 "
                  << " entries considered invalid; not read.\n";
#endif
        io_->seek(io_->tell() + nameLength, BasicIo::beg);
      } else {
        io_->read(buf.data(), nameLength);
      }

      v->read(Util::toString16(buf));

      io_->read(buf.data(), 2);
      dataType = Exiv2::getUShort(buf.data(), littleEndian);

      io_->read(buf.data(), 2);
      dataLength = Exiv2::getUShort(buf.data(), littleEndian);

      // Sanity check with an "unreasonably" large number
      if (dataLength > 5000) {
#ifndef SUPPRESS_WARNINGS
        EXV_ERROR << "Xmp.video.Metadata dataLength was found to be larger than 5000 "
                  << " entries considered invalid; not read.\n";
#endif
        io_->seek(io_->tell() + dataLength, BasicIo::beg);
      } else
        io_->read(buf.data(), dataLength);
    }

    if (dataType == 0) {  // Unicode String
      v->read(Util::toString16(buf));
    } else if (dataType == 2 || dataType == 5) {  // 16-bit Unsigned Integer
      v->read(Exiv2::toString(Exiv2::getUShort(buf.data(), littleEndian)));
    } else if (dataType == 3) {  // 32-bit Unsigned Integer
      v->read(Exiv2::toString(Exiv2::getULong(buf.data(), littleEndian)));
    } else if (dataType == 4) {  // 64-bit Unsigned Integer
      v->read(Exiv2::toString(Util::getUint64_t(buf)));
    } else if (dataType == 6) {  // 128-bit GUID
      v->read(Exiv2::toString(fileID));
    } else {  // Byte array
      v->read(Exiv2::toString(buf.data()));
    }
  }

  if (meta == 1) {
    xmpData().add(Exiv2::XmpKey("Xmp.video.Metadata"), v.get());
  } else if (meta == 2) {
    xmpData().add(Exiv2::XmpKey("Xmp.video.ExtendedContentDescription"), v.get());
  } else {
    xmpData().add(Exiv2::XmpKey("Xmp.video.MetadataLibrary"), v.get());
  }
}  // AsfVideo::metadataHandler

void AsfVideo::fileProperties() {
  DataBuf buf(BUFF_MIN_SIZE);

  byte guidBuf[GUI_SIZE];
  io_->read(guidBuf, GUI_SIZE);
  char fileID[GUID_SIZE] = "";
  int count = 7;
  getGUID(guidBuf, fileID);
  xmpData()["Xmp.video.FileID"] = fileID;

  const TagDetails* td;

  while (count--) {
    td = find(filePropertiesTags, (count + 1));
    io_->read(buf.data(), BUFF_MIN_SIZE);

    if (count == 0) {
      buf.data()[4] = '\0';
      io_->read(buf.data(), 4);
      io_->read(buf.data(), 4);
    }

    if (count == 3 || count == 2) {
      xmpData()[exvGettext(td->label_)] = Util::getUint64_t(buf) / 10000;
    } else {
      xmpData()[exvGettext(td->label_)] = Util::getUint64_t(buf);
    }
  }
}  // AsfVideo::fileProperties

void AsfVideo::aspectRatio() {
  // TODO - Make a better unified method to handle all cases of Aspect Ratio

  double aspectRatio = (double)width_ / height_;
  aspectRatio = floor(aspectRatio * 10) / 10;
  xmpData()["Xmp.video.AspectRatio"] = aspectRatio;

  int aR = (int)((aspectRatio * 10.0) + 0.1);

  switch (aR) {
    case 13:
      xmpData()["Xmp.video.AspectRatio"] = "4:3";
      break;
    case 17:
      xmpData()["Xmp.video.AspectRatio"] = "16:9";
      break;
    case 10:
      xmpData()["Xmp.video.AspectRatio"] = "1:1";
      break;
    case 16:
      xmpData()["Xmp.video.AspectRatio"] = "16:10";
      break;
    case 22:
      xmpData()["Xmp.video.AspectRatio"] = "2.21:1";
      break;
    case 23:
      xmpData()["Xmp.video.AspectRatio"] = "2.35:1";
      break;
    case 12:
      xmpData()["Xmp.video.AspectRatio"] = "5:4";
      break;
    default:
      xmpData()["Xmp.video.AspectRatio"] = aspectRatio;
      break;
  }
}  // AsfVideo::aspectRatio

Image::UniquePtr newAsfInstance(BasicIo::UniquePtr io, bool /*create*/) {
  auto image = std::make_unique<AsfVideo>(std::move(io));
  if (!image->good()) {
    image.reset();
  }
  return image;
}

bool isAsfType(BasicIo& iIo, bool advance) {
  const int32_t len = 16;
  byte buf[len];
  iIo.read(buf, len);

  if (iIo.error() || iIo.eof()) {
    return false;
  }

  bool matched = isASFType(buf);
  if (!advance || !matched) {
    iIo.seek(0, BasicIo::beg);
  }

  return matched;
}

}  // namespace Exiv2
   //#endif // EXV_ENABLE_VIDEO