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208 lines
7.3 KiB
C++
208 lines
7.3 KiB
C++
// ***************************************************************** -*- C++ -*-
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/*
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* Copyright (C) 2004-2021 Exiv2 authors
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* This program is part of the Exiv2 distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* asize_t with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef RIFFVIDEO_HPP
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#define RIFFVIDEO_HPP
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// *****************************************************************************
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#include "exiv2lib_export.h"
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// included header files
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#include "exif.hpp"
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#include "image.hpp"
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// *****************************************************************************
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// namespace extensions
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namespace Exiv2 {
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// *****************************************************************************
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// class definitions
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/*!
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@brief Class to access RIFF video files.
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*/
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class EXIV2API RiffVideo : public Image {
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public:
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//! @name Creators
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//@{
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/*!
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@brief Constructor for a Riff video. Since the constructor
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can not return a result, callers should check the good() method
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after object construction to determine success or failure.
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@param io An auto-pointer that owns a BasicIo instance used for
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reading and writing image metadata. \b Important: The constructor
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takes ownership of the passed in BasicIo instance through the
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auto-pointer. Callers should not continue to use the BasicIo
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instance after it is passed to this method. Use the Image::io()
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method to get a temporary reference.
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*/
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explicit RiffVideo(BasicIo::UniquePtr io);
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//! Copy constructor
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RiffVideo(const RiffVideo& rhs) = delete;
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//! Assignment operator
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RiffVideo& operator=(const RiffVideo& rhs) = delete;
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//@}
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//! @name Manipulators
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//@{
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void printStructure(std::ostream& out, PrintStructureOption option, size_t depth) override;
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void readMetadata() override;
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void writeMetadata() override;
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//@}
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//! @name Accessors
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//@{
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[[nodiscard]] std::string mimeType() const override;
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[[nodiscard]] static const char* printAudioEncoding(uint64_t i);
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//@}
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protected:
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/*!
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@brief Check for a valid tag and decode the block at the current IO
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position. Calls tagDecoder() or skips to next tag, if required.
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*/
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void decodeBlock();
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/*!
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@brief Interpret tag information, and call the respective function
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to save it in the respective XMP container. Decodes a Tag
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Information and saves it in the respective XMP container, if
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the block size is small.
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@param buf Data buffer which cotains tag ID.
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@param size Size of the data block used to store Tag Information.
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*/
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void tagDecoder(Exiv2::DataBuf& buf, size_t size);
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/*!
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@brief Interpret Junk tag information, and save it
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in the respective XMP container.
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@param size Size of the data block used to store Tag Information.
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*/
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void junkHandler(size_t size);
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/*!
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@brief Interpret Stream tag information, and save it
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in the respective XMP container.
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@param size Size of the data block used to store Tag Information.
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*/
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void streamHandler(size_t size);
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/*!
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@brief Interpret Stream Format tag information, and save it
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in the respective XMP container.
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@param size Size of the data block used to store Tag Information.
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*/
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void streamFormatHandler(size_t size);
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/*!
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@brief Interpret Riff Header tag information, and save it
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in the respective XMP container.
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@param size Size of the data block used to store Tag Information.
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*/
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void aviHeaderTagsHandler(size_t size);
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/*!
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@brief Interpret Riff List tag information, and save it
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in the respective XMP container.
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@param size Size of the data block used to store Tag Information.
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*/
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void listHandler(size_t size);
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/*!
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@brief Interpret Riff Stream Data tag information, and save it
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in the respective XMP container.
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@param size Size of the data block used to store Tag Information.
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*/
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void streamDataTagHandler(size_t size);
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/*!
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@brief Interpret INFO tag information, and save it
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in the respective XMP container.
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*/
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void infoTagsHandler();
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/*!
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@brief Interpret Nikon Tags related to Video information, and
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save it in the respective XMP container.
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*/
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void nikonTagsHandler();
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/*!
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@brief Interpret OpenDML tag information, and save it
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in the respective XMP container.
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*/
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void odmlTagsHandler();
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//! @brief Skips Particular Blocks of Metadata List.
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void skipListData();
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/*!
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@brief Interprets DateTimeOriginal tag or stream name tag
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information, and save it in the respective XMP container.
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@param size Size of the data block used to store Tag Information.
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@param i parameter used to overload function
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*/
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void dateTimeOriginal(size_t size, int i = 0);
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/*!
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@brief Calculates Sample Rate of a particular stream.
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@param buf Data buffer with the dividend.
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@param divisor The Divisor required to calculate sample rate.
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@return Return the sample rate of the stream.
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*/
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[[nodiscard]] static double returnSampleRate(Exiv2::DataBuf& buf, size_t divisor = 1);
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/*!
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@brief Calculates Aspect Ratio of a video, and stores it in the
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respective XMP container.
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@param width Width of the video.
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@param height Height of the video.
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*/
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void fillAspectRatio(size_t width = 1, size_t height = 1);
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/*!
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@brief Calculates Duration of a video, and stores it in the
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respective XMP container.
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@param frame_rate Frame rate of the video.
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@param frame_count Total number of frames present in the video.
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*/
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void fillDuration(double frame_rate, size_t frame_count);
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[[nodiscard]] static bool equalsRiffTag(Exiv2::DataBuf& buf, const char* str);
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static void copyTagValue(DataBuf& buf_dest, DataBuf& buf_src, size_t index = RIFF_TAG_SIZE);
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private:
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static constexpr size_t RIFF_TAG_SIZE = 0x4;
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static constexpr auto RIFF_CHUNK_HEADER_ICCP = "ICCP";
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static constexpr auto RIFF_CHUNK_HEADER_EXIF = "EXIF";
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static constexpr auto RIFF_CHUNK_HEADER_XMP = "XMP ";
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//! Variable to check the end of metadata traversing.
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bool continueTraversing_;
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//! Variable which stores current stream being processsed.
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int streamType_;
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}; // Class RiffVideo
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// *****************************************************************************
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// template, inline and free functions
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// These could be static private functions on Image subclasses but then
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// ImageFactory needs to be made a friend.
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/*!
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@brief Create a new RiffVideo instance and return an auto-pointer to it.
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Caller owns the returned object and the auto-pointer ensures that
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it will be deleted.
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*/
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EXIV2API Image::UniquePtr newRiffInstance(BasicIo::UniquePtr io, bool create);
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//! Check if the file iIo is a Riff Video.
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EXIV2API bool isRiffType(BasicIo& iIo, bool advance);
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} // namespace Exiv2
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#endif // RIFFVIDEO_HPP
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