181 lines
5.2 KiB
C++
181 lines
5.2 KiB
C++
#ifndef TAG_PARSER_MP4TAG_H
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#define TAG_PARSER_MP4TAG_H
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#include "./mp4tagfield.h"
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#include "../fieldbasedtag.h"
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namespace TagParser {
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class Mp4Atom;
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class Mp4Tag;
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struct TAG_PARSER_EXPORT Mp4ExtendedFieldId {
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Mp4ExtendedFieldId(const char *mean = nullptr, const char *name = nullptr, bool updateOnly = false);
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Mp4ExtendedFieldId(KnownField field);
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operator bool() const;
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bool matches(const Mp4TagField &field) const;
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/// \brief mean parameter, usually Mp4TagExtendedMeanIds::iTunes
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const char *mean;
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/// \brief name parameter
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const char *name;
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/// \brief Whether only existing fields should be updated but *no* new extended field should be created
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bool updateOnly;
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};
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/*!
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* \brief Constructs a new instance with the specified parameter.
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*/
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inline Mp4ExtendedFieldId::Mp4ExtendedFieldId(const char *mean, const char *name, bool updateOnly)
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: mean(mean)
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, name(name)
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, updateOnly(updateOnly)
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{
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}
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/*!
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* \brief Returns whether valid parameter are assigned.
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*/
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inline Mp4ExtendedFieldId::operator bool() const
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{
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return mean && name;
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}
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/*!
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* \brief Returns whether the current parameter match the specified \a field.
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*/
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inline bool Mp4ExtendedFieldId::matches(const Mp4TagField &field) const
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{
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return field.mean() == mean && field.name() == name;
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}
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class TAG_PARSER_EXPORT Mp4TagMaker {
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friend class Mp4Tag;
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public:
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void make(std::ostream &stream, Diagnostics &diag);
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const Mp4Tag &tag() const;
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std::uint64_t requiredSize() const;
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private:
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Mp4TagMaker(Mp4Tag &tag, Diagnostics &diag);
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Mp4Tag &m_tag;
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std::vector<Mp4TagFieldMaker> m_maker;
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std::uint64_t m_metaSize;
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std::uint64_t m_ilstSize;
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bool m_omitPreDefinedGenre;
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};
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/*!
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* \brief Returns the associated tag.
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*/
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inline const Mp4Tag &Mp4TagMaker::tag() const
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{
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return m_tag;
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}
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/*!
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* \brief Returns the number of bytes which will be written when making the tag.
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*/
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inline std::uint64_t Mp4TagMaker::requiredSize() const
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{
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return m_metaSize;
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}
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/*!
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* \brief Defines traits for the TagField implementation of the Mp4Tag class.
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*/
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template <> class TAG_PARSER_EXPORT FieldMapBasedTagTraits<Mp4Tag> {
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public:
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using FieldType = Mp4TagField;
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using Compare = std::less<typename FieldType::IdentifierType>;
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};
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class TAG_PARSER_EXPORT Mp4Tag final : public FieldMapBasedTag<Mp4Tag> {
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friend class FieldMapBasedTag<Mp4Tag>;
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public:
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Mp4Tag();
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static constexpr TagType tagType = TagType::Mp4Tag;
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static constexpr const char *tagName = "MP4/iTunes tag";
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static constexpr TagTextEncoding defaultTextEncoding = TagTextEncoding::Utf8;
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bool canEncodingBeUsed(TagTextEncoding encoding) const override;
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bool supportsField(KnownField field) const override;
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using FieldMapBasedTag<Mp4Tag>::value;
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const TagValue &value(KnownField value) const override;
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using FieldMapBasedTag<Mp4Tag>::values;
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std::vector<const TagValue *> values(KnownField field) const override;
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const TagValue &value(const std::string &mean, const std::string &name) const;
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const TagValue &value(const char *mean, const char *name) const;
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using FieldMapBasedTag<Mp4Tag>::setValue;
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bool setValue(KnownField field, const TagValue &value) override;
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using FieldMapBasedTag<Mp4Tag>::setValues;
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bool setValues(KnownField field, const std::vector<TagValue> &values) override;
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bool setValue(const std::string &mean, const std::string &name, const TagValue &value);
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bool setValue(const char *mean, const char *name, const TagValue &value);
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using FieldMapBasedTag<Mp4Tag>::hasField;
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bool hasField(KnownField value) const override;
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bool supportsMultipleValues(KnownField) const override;
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void parse(Mp4Atom &metaAtom, Diagnostics &diag);
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Mp4TagMaker prepareMaking(Diagnostics &diag);
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void make(std::ostream &stream, Diagnostics &diag);
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protected:
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IdentifierType internallyGetFieldId(KnownField field) const;
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KnownField internallyGetKnownField(const IdentifierType &id) const;
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void internallyGetValuesFromField(const FieldType &field, std::vector<const TagValue *> &values) const;
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};
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/*!
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* \brief Constructs a new tag.
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*/
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inline Mp4Tag::Mp4Tag()
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{
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}
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inline bool Mp4Tag::supportsField(KnownField field) const
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{
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switch (field) {
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case KnownField::EncoderSettings:
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return true;
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default:
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return FieldMapBasedTag<Mp4Tag>::supportsField(field);
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}
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}
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/*!
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* \brief Returns the value of the field with the specified \a mean and \a name attributes.
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*/
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inline const TagValue &Mp4Tag::value(const std::string &mean, const std::string &name) const
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{
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return value(mean.data(), name.data());
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}
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/*!
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* \brief Assigns the given \a value to the field with the specified \a mean and \a name attributes.
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*/
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inline bool Mp4Tag::setValue(const std::string &mean, const std::string &name, const TagValue &value)
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{
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return setValue(mean.data(), name.data(), value);
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}
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/*!
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* \brief Returns false for all fields (for now).
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* \remarks Not sure whether iTunes-style MP4 tags allow this. Let's return false for now.
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* \todo Do some research whether it is supported or not.
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*/
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inline bool Mp4Tag::supportsMultipleValues(KnownField) const
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{
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return false;
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}
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} // namespace TagParser
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#endif // TAG_PARSER_MP4TAG_H
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