703 lines
28 KiB
C++
703 lines
28 KiB
C++
#include "./mp4tagfield.h"
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#include "./mp4atom.h"
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#include "./mp4container.h"
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#include "./mp4ids.h"
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#include "../exceptions.h"
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#include <c++utilities/conversion/stringbuilder.h>
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#include <c++utilities/io/binaryreader.h>
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#include <c++utilities/io/binarywriter.h>
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#include <algorithm>
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#include <limits>
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#include <memory>
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using namespace std;
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using namespace CppUtilities;
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namespace TagParser {
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/*!
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* \class TagParser::Mp4TagField
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* \brief The Mp4TagField class is used by Mp4Tag to store the fields.
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*/
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/*!
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* \brief Constructs a new Mp4TagField.
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*/
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Mp4TagField::Mp4TagField()
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: m_parsedRawDataType(RawDataType::Reserved)
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, m_countryIndicator(0)
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, m_langIndicator(0)
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{
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}
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/*!
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* \brief Constructs a new Mp4TagField with the specified \a id and \a value.
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*/
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Mp4TagField::Mp4TagField(IdentifierType id, const TagValue &value)
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: TagField<Mp4TagField>(id, value)
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, m_parsedRawDataType(RawDataType::Reserved)
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, m_countryIndicator(0)
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, m_langIndicator(0)
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{
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}
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/*!
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* \brief Constructs a new Mp4TagField with the specified \a mean, \a name and \a value.
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*
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* The ID will be set to Mp4TagAtomIds::Extended indicating an tag field using the
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* reverse DNS style.
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*
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* \sa The last paragraph of <a href="http://atomicparsley.sourceforge.net/mpeg-4files.html">Known iTunes Metadata Atoms</a>
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* gives additional information about this form of MP4 tag fields.
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*/
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Mp4TagField::Mp4TagField(std::string_view mean, std::string_view name, const TagValue &value)
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: Mp4TagField(Mp4TagAtomIds::Extended, value)
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{
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m_name = name;
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m_mean = mean;
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}
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/*!
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* \brief Parses field information from the specified Mp4Atom.
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*
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* The specified atom should be a child atom of the "ilst" atom.
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* Each child of the "ilst" atom holds one field of the Mp4Tag.
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*
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* \throws Throws std::ios_base::failure when an IO error occurs.
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* \throws Throws TagParser::Failure or a derived exception when a parsing
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* error occurs.
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*/
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void Mp4TagField::reparse(Mp4Atom &ilstChild, Diagnostics &diag)
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{
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// prepare reparsing
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using namespace Mp4AtomIds;
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using namespace Mp4TagAtomIds;
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string context("parsing MP4 tag field");
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ilstChild.parse(diag); // ensure child has been parsed
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setId(ilstChild.id());
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context = "parsing MP4 tag field " + ilstChild.idToString();
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iostream &stream = ilstChild.stream();
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BinaryReader &reader = ilstChild.container().reader();
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int dataAtomFound = 0, meanAtomFound = 0, nameAtomFound = 0;
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for (Mp4Atom *dataAtom = ilstChild.firstChild(); dataAtom; dataAtom = dataAtom->nextSibling()) {
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try {
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dataAtom->parse(diag);
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if (dataAtom->id() == Mp4AtomIds::Data) {
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if (dataAtom->dataSize() < 8) {
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diag.emplace_back(DiagLevel::Warning,
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"Truncated child atom \"data\" in tag atom (ilst child) found. It will be ignored and discarded when applying changes.",
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context);
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continue;
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}
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auto *val = &value();
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auto *rawDataType = &m_parsedRawDataType;
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auto *countryIndicator = &m_countryIndicator;
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auto *languageIndicator = &m_langIndicator;
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if (++dataAtomFound > 1) {
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if (dataAtomFound == 2) {
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diag.emplace_back(DiagLevel::Warning,
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"Multiple \"data\" child atom in tag atom (ilst child) found. It will be ignored but preserved when applying changes.",
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context);
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}
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auto &additionalData = m_additionalData.emplace_back();
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val = &additionalData.value;
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rawDataType = &additionalData.rawDataType;
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countryIndicator = &additionalData.countryIndicator;
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languageIndicator = &additionalData.languageIndicator;
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}
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stream.seekg(static_cast<streamoff>(dataAtom->dataOffset()));
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if (reader.readByte() != 0) {
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diag.emplace_back(DiagLevel::Warning,
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"The version indicator byte is not zero, the tag atom might be unsupported and hence not be parsed correctly.", context);
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}
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setTypeInfo(*rawDataType = reader.readUInt24BE());
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try { // try to show warning if parsed raw data type differs from expected raw data type for this atom id
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const vector<std::uint32_t> expectedRawDataTypes = this->expectedRawDataTypes();
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if (find(expectedRawDataTypes.cbegin(), expectedRawDataTypes.cend(), m_parsedRawDataType) == expectedRawDataTypes.cend()) {
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diag.emplace_back(DiagLevel::Warning, "Unexpected data type indicator found.", context);
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}
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} catch (const Failure &) {
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// tag id is unknown, it is not possible to validate parsed data type
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}
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*countryIndicator = reader.readUInt16BE(); // FIXME: use locale within the tag value
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*languageIndicator = reader.readUInt16BE(); // FIXME: use locale within the tag value
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switch (*rawDataType) {
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case RawDataType::Utf8:
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case RawDataType::Utf16:
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stream.seekg(static_cast<streamoff>(dataAtom->dataOffset() + 8));
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val->assignText(reader.readString(dataAtom->dataSize() - 8),
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(m_parsedRawDataType == RawDataType::Utf16) ? TagTextEncoding::Utf16BigEndian : TagTextEncoding::Utf8);
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break;
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case RawDataType::Gif:
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case RawDataType::Jpeg:
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case RawDataType::Png:
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case RawDataType::Bmp: {
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switch (m_parsedRawDataType) {
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case RawDataType::Gif:
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val->setMimeType("image/gif");
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break;
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case RawDataType::Jpeg:
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val->setMimeType("image/jpeg");
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break;
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case RawDataType::Png:
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val->setMimeType("image/png");
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break;
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case RawDataType::Bmp:
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val->setMimeType("image/bmp");
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break;
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default:;
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}
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const auto coverSize = static_cast<streamoff>(dataAtom->dataSize() - 8);
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auto coverData = make_unique<char[]>(static_cast<size_t>(coverSize));
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stream.read(coverData.get(), coverSize);
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val->assignData(std::move(coverData), static_cast<size_t>(coverSize), TagDataType::Picture);
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break;
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}
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case RawDataType::BeSignedInt: {
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int number = 0;
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if (dataAtom->dataSize() > (8 + 4)) {
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diag.emplace_back(DiagLevel::Warning, "Data atom stores integer of invalid size. Trying to read data anyways.", context);
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}
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if (dataAtom->dataSize() >= (8 + 4)) {
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number = reader.readInt32BE();
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} else if (dataAtom->dataSize() == (8 + 2)) {
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number = reader.readInt16BE();
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} else if (dataAtom->dataSize() == (8 + 1)) {
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number = reader.readChar();
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}
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switch (ilstChild.id()) {
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case PreDefinedGenre: // consider number as standard genre index
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val->assignStandardGenreIndex(number);
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break;
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default:
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val->assignInteger(number);
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}
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break;
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}
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case RawDataType::BeUnsignedInt: {
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int number = 0;
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if (dataAtom->dataSize() > (8 + 4)) {
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diag.emplace_back(DiagLevel::Warning, "Data atom stores integer of invalid size. Trying to read data anyways.", context);
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}
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if (dataAtom->dataSize() >= (8 + 4)) {
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number = static_cast<int>(reader.readUInt32BE());
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} else if (dataAtom->dataSize() == (8 + 2)) {
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number = static_cast<int>(reader.readUInt16BE());
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} else if (dataAtom->dataSize() == (8 + 1)) {
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number = static_cast<int>(reader.readByte());
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}
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switch (ilstChild.id()) {
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case PreDefinedGenre: // consider number as standard genre index
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val->assignStandardGenreIndex(number - 1);
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break;
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default:
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val->assignInteger(number);
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}
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break;
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}
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default:
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switch (ilstChild.id()) {
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// track number, disk number and genre have no specific data type id
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case TrackPosition:
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case DiskPosition: {
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if (dataAtom->dataSize() < (8 + 6)) {
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diag.emplace_back(DiagLevel::Warning, "Track/disk position is truncated. Trying to read data anyways.", context);
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}
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std::uint16_t pos = 0, total = 0;
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if (dataAtom->dataSize() >= (8 + 4)) {
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stream.seekg(2, ios_base::cur);
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pos = reader.readUInt16BE();
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}
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if (dataAtom->dataSize() >= (8 + 6)) {
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total = reader.readUInt16BE();
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}
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val->assignPosition(PositionInSet(pos, total));
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break;
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}
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case PreDefinedGenre:
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if (dataAtom->dataSize() < (8 + 2)) {
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diag.emplace_back(DiagLevel::Warning, "Genre index is truncated.", context);
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} else {
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val->assignStandardGenreIndex(reader.readUInt16BE() - 1);
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}
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break;
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default: // no supported data type, read raw data
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const auto dataSize = static_cast<streamsize>(dataAtom->dataSize() - 8);
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auto data = make_unique<char[]>(static_cast<size_t>(dataSize));
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stream.read(data.get(), dataSize);
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if (ilstChild.id() == Mp4TagAtomIds::Cover) {
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val->assignData(std::move(data), static_cast<size_t>(dataSize), TagDataType::Picture);
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} else {
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val->assignData(std::move(data), static_cast<size_t>(dataSize), TagDataType::Undefined);
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}
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}
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}
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} else if (dataAtom->id() == Mp4AtomIds::Mean) {
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if (dataAtom->dataSize() < 8) {
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diag.emplace_back(DiagLevel::Warning,
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"Truncated child atom \"mean\" in tag atom (ilst child) found. It will be ignored and discarded when applying changes.",
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context);
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continue;
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}
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if (++meanAtomFound > 1) {
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if (meanAtomFound == 2) {
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diag.emplace_back(DiagLevel::Warning,
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"Tag atom contains more than one mean atom. The additional mean atoms will be ignored and discarded when applying "
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"changes.",
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context);
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}
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continue;
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}
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stream.seekg(static_cast<streamoff>(dataAtom->dataOffset() + 4));
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m_mean = reader.readString(dataAtom->dataSize() - 4);
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} else if (dataAtom->id() == Mp4AtomIds::Name) {
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if (dataAtom->dataSize() < 4) {
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diag.emplace_back(DiagLevel::Warning,
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"Truncated child atom \"name\" in tag atom (ilst child) found. It will be ignored and discarded when applying changes.",
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context);
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continue;
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}
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if (++nameAtomFound > 1) {
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if (nameAtomFound == 2) {
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diag.emplace_back(DiagLevel::Warning,
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"Tag atom contains more than one name atom. The addiational name atoms will be ignored and discarded when applying "
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"changes.",
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context);
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}
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continue;
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}
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stream.seekg(static_cast<streamoff>(dataAtom->dataOffset() + 4));
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m_name = reader.readString(dataAtom->dataSize() - 4);
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} else {
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diag.emplace_back(DiagLevel::Warning,
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"Unknown child atom \"" % dataAtom->idToString()
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+ "\" in tag atom (ilst child) found. It will be ignored and discarded when applying changes.",
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context);
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}
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} catch (const Failure &) {
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diag.emplace_back(DiagLevel::Warning,
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"Unable to parse all children atom in tag atom (ilst child) found. Invalid children will be ignored and discarded when applying "
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"changes.",
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context);
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}
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}
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if (value().isEmpty()) {
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diag.emplace_back(DiagLevel::Warning, "The field value is empty.", context);
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}
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}
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/*!
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* \brief Prepares making.
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* \returns Returns a Mp4TagFieldMaker object which can be used to actually make the field.
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* \remarks The field must NOT be mutated after making is prepared when it is intended to actually
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* make the field using the make method of the returned object.
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* \throws Throws TagParser::Failure or a derived exception when a making
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* error occurs.
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*
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* This method might be useful when it is necessary to know the size of the field before making it.
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*/
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Mp4TagFieldMaker Mp4TagField::prepareMaking(Diagnostics &diag)
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{
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return Mp4TagFieldMaker(*this, diag);
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}
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/*!
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* \brief Saves the field to the specified \a stream.
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*
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* \throws Throws std::ios_base::failure when an IO error occurs.
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* \throws Throws TagParser::Failure or a derived exception when a making
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* error occurs.
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*/
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void Mp4TagField::make(ostream &stream, Diagnostics &diag)
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{
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prepareMaking(diag).make(stream);
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}
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/*!
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* \brief Returns the expected raw data types for the ID of the field.
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*/
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std::vector<std::uint32_t> Mp4TagField::expectedRawDataTypes() const
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{
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using namespace Mp4TagAtomIds;
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std::vector<std::uint32_t> res;
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switch (id()) {
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case Album:
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case Artist:
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case Comment:
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case Year:
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case Title:
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case Genre:
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case Composer:
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case Encoder:
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case Grouping:
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case Description:
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case Lyrics:
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case RecordLabel:
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case Performers:
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case Lyricist:
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res.push_back(RawDataType::Utf8);
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res.push_back(RawDataType::Utf16);
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break;
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case PreDefinedGenre:
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case TrackPosition:
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case DiskPosition:
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res.push_back(RawDataType::Reserved);
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break;
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case Bpm:
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case Rating: // 0 = None, 1 = Explicit, 2 = Clean
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res.push_back(RawDataType::BeSignedInt);
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res.push_back(RawDataType::BeUnsignedInt);
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break;
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case Cover:
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res.push_back(RawDataType::Gif);
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res.push_back(RawDataType::Jpeg);
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res.push_back(RawDataType::Png);
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res.push_back(RawDataType::Bmp);
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break;
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case Extended:
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if (mean() != Mp4TagExtendedMeanIds::iTunes) {
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throw Failure();
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}
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// assumption that extended "iTunes" tags always use Unicode correct?
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res.push_back(RawDataType::Utf8);
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res.push_back(RawDataType::Utf16);
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break;
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default:
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throw Failure();
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}
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return res;
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}
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/*!
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* \brief Returns an appropriate raw data type.
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* \return
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* Returns the type info if assigned; otherwise returns a raw data type considered as appropriate for the
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* ID of the field and its value.
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* \sa See Mp4TagField::appropriateRawDataTypeForValue() for the behavior if no type info is assigned.
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*/
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std::uint32_t Mp4TagField::appropriateRawDataType() const
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{
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if (isTypeInfoAssigned()) {
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// obtain raw data type from tag field if present
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return typeInfo();
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}
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// there is no raw data type assigned (tag field was not present in original file and
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// has been inserted by the library's user without type)
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// -> try to derive appropriate raw data type from atom ID
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return appropriateRawDataTypeForValue(value());
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}
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/*!
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* \brief Returns an appropriate raw data type.
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* \returns
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* Returns a raw data type considered as appropriate for the ID of the field and the specified \a value.
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* \throws
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* Throws TagParser::Failure if an appropriate raw data type can not be determined. It is possible to determine
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* the raw data type for all supported tag field IDs (those where a conversion to KnownField via Mp4Tag exists).
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*/
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std::uint32_t Mp4TagField::appropriateRawDataTypeForValue(const TagValue &value) const
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{
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using namespace Mp4TagAtomIds;
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switch (id()) {
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case Album:
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case Artist:
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case Comment:
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case Year:
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case Title:
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case Genre:
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case Composer:
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case Encoder:
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case Grouping:
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case Description:
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case Lyrics:
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case RecordLabel:
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case Performers:
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case Lyricist:
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case AlbumArtist:
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switch (value.dataEncoding()) {
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case TagTextEncoding::Utf8:
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return RawDataType::Utf8;
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case TagTextEncoding::Utf16BigEndian:
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return RawDataType::Utf16;
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default:;
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}
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break;
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case TrackPosition:
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case DiskPosition:
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return RawDataType::Reserved;
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case PreDefinedGenre:
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case Bpm:
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case Rating:
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return RawDataType::BeSignedInt;
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case Cover: {
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const string &mimeType = value.mimeType();
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if (mimeType == "image/jpg" || mimeType == "image/jpeg") { // "well-known" type
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return RawDataType::Jpeg;
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} else if (mimeType == "image/png") {
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return RawDataType::Png;
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} else if (mimeType == "image/bmp") {
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return RawDataType::Bmp;
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}
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} break;
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case Extended:
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if (mean() != Mp4TagExtendedMeanIds::iTunes) {
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throw Failure();
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}
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switch (value.dataEncoding()) {
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case TagTextEncoding::Utf8:
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return RawDataType::Utf8;
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case TagTextEncoding::Utf16BigEndian:
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return RawDataType::Utf16;
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default:;
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}
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break;
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default:;
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}
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// do not forget to extend Mp4Tag::internallyGetFieldId() and Mp4Tag::internallyGetKnownField() as well
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throw Failure();
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}
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/*!
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* \brief Clears MP4-specific values. Called via clear() and clearValue().
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*/
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void Mp4TagField::internallyClearValue()
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{
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value().clearDataAndMetadata();
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m_additionalData.clear();
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m_countryIndicator = 0;
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m_langIndicator = 0;
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}
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/*!
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* \brief Clears MP4-specific values. Called via clear() and clearValue().
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*/
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void Mp4TagField::internallyClearFurtherData()
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{
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m_name.clear();
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m_mean.clear();
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m_parsedRawDataType = RawDataType::Reserved;
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}
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/// \cond
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Mp4TagFieldMaker::Data::Data()
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: convertedData(stringstream::in | stringstream::out | stringstream::binary)
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{
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}
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/// \endcond
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/*!
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* \class TagParser::Mp4TagFieldMaker
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* \brief The Mp4TagFieldMaker class helps making tag fields.
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* It allows to calculate the required size.
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* \sa See Mp4TagFieldMaker::prepareMaking() for more information.
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*/
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/*!
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* \brief Prepares making the specified \a field.
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* \sa See Mp4TagField::prepareMaking() for more information.
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*/
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Mp4TagFieldMaker::Mp4TagFieldMaker(Mp4TagField &field, Diagnostics &diag)
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: m_field(field)
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, m_writer(nullptr)
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, m_totalSize(0)
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{
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if (!m_field.id()) {
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diag.emplace_back(DiagLevel::Warning, "Invalid tag atom ID.", "making MP4 tag field");
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throw InvalidDataException();
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}
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const string context("making MP4 tag field " + Mp4TagField::fieldIdToString(m_field.id()));
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if (m_field.value().isEmpty() && (!m_field.mean().empty() || !m_field.name().empty())) {
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diag.emplace_back(DiagLevel::Critical, "No tag value assigned.", context);
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throw InvalidDataException();
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}
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|
|
|
// calculate size for name and mean
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m_totalSize = 8 + (m_field.name().empty() ? 0 : (12 + m_field.name().size())) + (m_field.mean().empty() ? 0 : (12 + m_field.mean().size()));
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|
|
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// prepare making data atom and calculate the expected size
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m_totalSize += prepareDataAtom(field.value(), field.countryIndicator(), field.languageIndicator(), context, diag);
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for (const auto &additionalData : m_field.additionalData()) {
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m_totalSize += prepareDataAtom(additionalData.value, additionalData.countryIndicator, additionalData.languageIndicator, context, diag);
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}
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|
|
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if (m_totalSize > numeric_limits<std::uint32_t>::max()) {
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|
diag.emplace_back(DiagLevel::Critical, "Making a such big MP4 tag field is not possible.", context);
|
|
throw NotImplementedException();
|
|
}
|
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}
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|
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/*!
|
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* \brief Prepares making a data atom for the specified \a value.
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|
*/
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std::uint64_t Mp4TagFieldMaker::prepareDataAtom(
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const TagValue &value, std::uint16_t countryIndicator, std::uint16_t languageIndicator, const std::string &context, Diagnostics &diag)
|
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{
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// add new data entry
|
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auto &data = m_data.emplace_back();
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m_writer.setStream(&data.convertedData);
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|
|
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// assign local info
|
|
// FIXME: use locale within the tag value instead of just passing through current values
|
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data.countryIndicator = countryIndicator;
|
|
data.languageIndicator = languageIndicator;
|
|
|
|
try {
|
|
// try to use appropriate raw data type
|
|
data.rawType = m_field.isTypeInfoAssigned() ? m_field.typeInfo() : m_field.appropriateRawDataTypeForValue(value);
|
|
} catch (const Failure &) {
|
|
// unable to obtain appropriate raw data type
|
|
if (m_field.id() == Mp4TagAtomIds::Cover) {
|
|
// assume JPEG image
|
|
data.rawType = RawDataType::Jpeg;
|
|
diag.emplace_back(
|
|
DiagLevel::Warning, "It was not possible to find an appropriate raw data type id. JPEG image will be assumed.", context);
|
|
} else {
|
|
// assume UTF-8 text
|
|
data.rawType = RawDataType::Utf8;
|
|
diag.emplace_back(DiagLevel::Warning, "It was not possible to find an appropriate raw data type id. UTF-8 will be assumed.", context);
|
|
}
|
|
}
|
|
|
|
try {
|
|
if (!value.isEmpty()) { // there might be only mean and name info, but no data
|
|
data.convertedData.exceptions(std::stringstream::failbit | std::stringstream::badbit);
|
|
switch (data.rawType) {
|
|
case RawDataType::Utf8:
|
|
if (value.type() != TagDataType::Text || value.dataEncoding() != TagTextEncoding::Utf8) {
|
|
m_writer.writeString(value.toString(TagTextEncoding::Utf8));
|
|
}
|
|
break;
|
|
case RawDataType::Utf16:
|
|
if (value.type() != TagDataType::Text || value.dataEncoding() != TagTextEncoding::Utf16LittleEndian) {
|
|
m_writer.writeString(value.toString(TagTextEncoding::Utf16LittleEndian));
|
|
}
|
|
break;
|
|
case RawDataType::BeSignedInt: {
|
|
int number = value.toInteger();
|
|
if (number <= numeric_limits<std::int16_t>::max() && number >= numeric_limits<std::int16_t>::min()) {
|
|
m_writer.writeInt16BE(static_cast<std::int16_t>(number));
|
|
} else {
|
|
m_writer.writeInt32BE(number);
|
|
}
|
|
break;
|
|
}
|
|
case RawDataType::BeUnsignedInt: {
|
|
int number = value.toInteger();
|
|
if (number <= numeric_limits<std::uint16_t>::max() && number >= numeric_limits<std::uint16_t>::min()) {
|
|
m_writer.writeUInt16BE(static_cast<std::uint16_t>(number));
|
|
} else if (number > 0) {
|
|
m_writer.writeUInt32BE(static_cast<std::uint32_t>(number));
|
|
} else {
|
|
throw ConversionException(
|
|
"Negative integer can not be assigned to the field with the ID \"" % interpretIntegerAsString<std::uint32_t>(m_field.id())
|
|
+ "\".");
|
|
}
|
|
break;
|
|
}
|
|
case RawDataType::Bmp:
|
|
case RawDataType::Jpeg:
|
|
case RawDataType::Png:
|
|
break; // leave converted data empty to write original data later
|
|
default:
|
|
switch (m_field.id()) {
|
|
// track number and disk number are exceptions
|
|
// raw data type 0 is used, information is stored as pair of unsigned integers
|
|
case Mp4TagAtomIds::TrackPosition:
|
|
case Mp4TagAtomIds::DiskPosition: {
|
|
PositionInSet pos = value.toPositionInSet();
|
|
m_writer.writeInt32BE(pos.position());
|
|
if (pos.total() <= numeric_limits<std::int16_t>::max()) {
|
|
m_writer.writeInt16BE(static_cast<std::int16_t>(pos.total()));
|
|
} else {
|
|
throw ConversionException(
|
|
"Integer can not be assigned to the field with the id \"" % interpretIntegerAsString<std::uint32_t>(m_field.id())
|
|
+ "\" because it is to big.");
|
|
}
|
|
m_writer.writeUInt16BE(0);
|
|
break;
|
|
}
|
|
case Mp4TagAtomIds::PreDefinedGenre:
|
|
m_writer.writeUInt16BE(static_cast<std::uint16_t>(value.toStandardGenreIndex()));
|
|
break;
|
|
default:; // leave converted data empty to write original data later
|
|
}
|
|
}
|
|
}
|
|
} catch (const ConversionException &e) {
|
|
// it was not possible to perform required conversions
|
|
if (char_traits<char>::length(e.what())) {
|
|
diag.emplace_back(DiagLevel::Critical, e.what(), context);
|
|
} else {
|
|
diag.emplace_back(DiagLevel::Critical, "The assigned tag value can not be converted to be written appropriately.", context);
|
|
}
|
|
throw InvalidDataException();
|
|
}
|
|
|
|
// calculate data size; assign raw data
|
|
if (value.isEmpty()) {
|
|
return data.size = 0;
|
|
} else if (data.convertedData.tellp()) {
|
|
data.size = static_cast<std::size_t>(data.convertedData.tellp());
|
|
} else {
|
|
data.rawData = std::string_view(value.dataPointer(), data.size = value.dataSize());
|
|
}
|
|
return data.size += 16;
|
|
}
|
|
|
|
/*!
|
|
* \brief Saves the field (specified when constructing the object) to the
|
|
* specified \a stream.
|
|
* \throws Throws std::ios_base::failure when an IO error occurs.
|
|
* \throws Throws Assumes the data is already validated and thus does NOT
|
|
* throw TagParser::Failure or a derived exception.
|
|
*/
|
|
void Mp4TagFieldMaker::make(ostream &stream)
|
|
{
|
|
m_writer.setStream(&stream);
|
|
// size of entire tag atom
|
|
m_writer.writeUInt32BE(static_cast<std::uint32_t>(m_totalSize));
|
|
// id of tag atom
|
|
m_writer.writeUInt32BE(m_field.id());
|
|
// write "mean" atom
|
|
if (!m_field.mean().empty()) {
|
|
m_writer.writeUInt32BE(static_cast<std::uint32_t>(12 + m_field.mean().size()));
|
|
m_writer.writeUInt32BE(Mp4AtomIds::Mean);
|
|
m_writer.writeUInt32BE(0);
|
|
m_writer.writeString(m_field.mean());
|
|
}
|
|
// write "name" atom
|
|
if (!m_field.name().empty()) {
|
|
m_writer.writeUInt32BE(static_cast<std::uint32_t>(12 + m_field.name().length()));
|
|
m_writer.writeUInt32BE(Mp4AtomIds::Name);
|
|
m_writer.writeUInt32BE(0);
|
|
m_writer.writeString(m_field.name());
|
|
}
|
|
// write "data" atoms
|
|
for (auto &data : m_data) {
|
|
if (!data.size) {
|
|
continue;
|
|
}
|
|
m_writer.writeUInt32BE(static_cast<std::uint32_t>(data.size)); // size of data atom
|
|
m_writer.writeUInt32BE(Mp4AtomIds::Data); // id of data atom
|
|
m_writer.writeByte(0); // version
|
|
m_writer.writeUInt24BE(data.rawType);
|
|
m_writer.writeUInt16BE(data.countryIndicator);
|
|
m_writer.writeUInt16BE(data.languageIndicator);
|
|
if (data.convertedData.tellp()) {
|
|
// write converted data
|
|
stream << data.convertedData.rdbuf();
|
|
} else {
|
|
// no conversion was needed, write data directly from tag value
|
|
stream.write(data.rawData.data(), static_cast<std::streamoff>(data.rawData.size()));
|
|
}
|
|
}
|
|
}
|
|
|
|
} // namespace TagParser
|