asffile.cpp

来自「Amarok是一款在LINUX或其他类UNIX操作系统中运行的音频播放器软件。 」· C++ 代码 · 共 548 行 · 第 1/2 页

}

ByteVector
ASF::File::MetadataObject::render(ASF::File *file)
{
  data.clear();
  data.append(ByteVector::fromShort(attributeData.size(), false));
  data.append(attributeData.toByteVector(ByteVector::null));
  return BaseObject::render(file);
}

ByteVector
ASF::File::MetadataLibraryObject::guid()
{
  return metadataLibraryGuid;
}

void
ASF::File::MetadataLibraryObject::parse(ASF::File *file, uint /*size*/)
{
  file->d->metadataLibraryObject = this;
  int count = file->readWORD();
  while(count--) {
    ASF::Attribute attribute;
    String name = attribute.parse(*file, 2);
    file->d->tag->addAttribute(name, attribute);
  }
}

ByteVector
ASF::File::MetadataLibraryObject::render(ASF::File *file)
{
  data.clear();
  data.append(ByteVector::fromShort(attributeData.size(), false));
  data.append(attributeData.toByteVector(ByteVector::null));
  return BaseObject::render(file);
}

ByteVector
ASF::File::HeaderExtensionObject::guid()
{
  return headerExtensionGuid;
}

void
ASF::File::HeaderExtensionObject::parse(ASF::File *file, uint /*size*/)
{
  file->d->headerExtensionObject = this;
  file->seek(18, File::Current);
  long long dataSize = file->readDWORD();
  long long dataPos = 0;
  while(dataPos < dataSize) {
    ByteVector guid = file->readBlock(16);
    long long size = file->readQWORD();
    BaseObject *obj;
    if(guid == metadataGuid) {
      obj = new MetadataObject();
    }
    else if(guid == metadataLibraryGuid) {
      obj = new MetadataLibraryObject();
    }
    else {
      obj = new UnknownObject(guid);
    }
    obj->parse(file, size);
    objects.append(obj);
    dataPos += size;
  }
}

ByteVector
ASF::File::HeaderExtensionObject::render(ASF::File *file)
{
  data.clear();
  for(unsigned int i = 0; i < objects.size(); i++) {
    data.append(objects[i]->render(file));
  }
  data = ByteVector("\x11\xD2\xD3\xAB\xBA\xA9\xcf\x11\x8E\xE6\x00\xC0\x0C\x20\x53\x65\x06\x00", 18) + ByteVector::fromUInt(data.size(), false) + data;
  return BaseObject::render(file);
}

////////////////////////////////////////////////////////////////////////////////
// public members
////////////////////////////////////////////////////////////////////////////////

ASF::File::File(const char *file, bool readProperties, Properties::ReadStyle propertiesStyle) 
  : TagLib::File(file)
{
  d = new FilePrivate;
  read(readProperties, propertiesStyle);
}

ASF::File::~File()
{
  for(unsigned int i = 0; i < d->objects.size(); i++) {
    delete d->objects[i];
  }
  if(d->tag) {
    delete d->tag;
  }
  if(d->properties) {
    delete d->properties;
  }
  delete d;
}

ASF::Tag *ASF::File::tag() const
{
  return d->tag;
}

ASF::Properties *ASF::File::audioProperties() const
{
  return d->properties;
}

void ASF::File::read(bool /*readProperties*/, Properties::ReadStyle /*propertiesStyle*/)
{
  if(!isValid())
    return;

  ByteVector guid = readBlock(16);
  if(guid != headerGuid) {
    return;
  }

  d->tag = new ASF::Tag();
  d->properties = new ASF::Properties();

  d->size = readQWORD();
  int numObjects = readDWORD();
  seek(2, Current);

  for(int i = 0; i < numObjects; i++) {
    ByteVector guid = readBlock(16);
    long size = (long)readQWORD();
    BaseObject *obj;
    if(guid == filePropertiesGuid) {
      obj = new FilePropertiesObject();
    }
    else if(guid == streamPropertiesGuid) {
      obj = new StreamPropertiesObject();
    }
    else if(guid == contentDescriptionGuid) {
      obj = new ContentDescriptionObject();
    }
    else if(guid == extendedContentDescriptionGuid) {
      obj = new ExtendedContentDescriptionObject();
    }
    else if(guid == headerExtensionGuid) {
      obj = new HeaderExtensionObject();
    }
    else {
      obj = new UnknownObject(guid);
    }
    obj->parse(this, size);
    d->objects.append(obj);
  }
}

bool ASF::File::save()
{
  if(readOnly()) {
    return false;
  }

  if(!d->contentDescriptionObject) {
    d->contentDescriptionObject = new ContentDescriptionObject();
    d->objects.append(d->contentDescriptionObject);
  }
  if(!d->extendedContentDescriptionObject) {
    d->extendedContentDescriptionObject = new ExtendedContentDescriptionObject();
    d->objects.append(d->extendedContentDescriptionObject);
  }
  if(!d->headerExtensionObject) {
    d->headerExtensionObject = new HeaderExtensionObject();
    d->objects.append(d->headerExtensionObject);
  }
  if(!d->metadataObject) {
    d->metadataObject = new MetadataObject();
    d->headerExtensionObject->objects.append(d->metadataObject);
  }
  if(!d->metadataLibraryObject) {
    d->metadataLibraryObject = new MetadataLibraryObject();
    d->headerExtensionObject->objects.append(d->metadataLibraryObject);
  }

  ASF::AttributeListMap::ConstIterator it = d->tag->attributeListMap().begin();
  for(; it != d->tag->attributeListMap().end(); it++) {
    const String &name = it->first;
    const AttributeList &attributes = it->second;
    bool inExtendedContentDescriptionObject = false;
    bool inMetadataObject = false;
    for(unsigned int j = 0; j < attributes.size(); j++) {
      const Attribute &attribute = attributes[j];
      if(!inExtendedContentDescriptionObject && attribute.language() == 0 && attribute.stream() == 0) {
        d->extendedContentDescriptionObject->attributeData.append(attribute.render(name));
        inExtendedContentDescriptionObject = true;
      }
      else if(!inMetadataObject && attribute.language() == 0 && attribute.stream() != 0) {
        d->metadataObject->attributeData.append(attribute.render(name, 1));
        inMetadataObject = true;
      }
      else {
        d->metadataLibraryObject->attributeData.append(attribute.render(name, 2));
      }
    }
  }

  ByteVector data;
  for(unsigned int i = 0; i < d->objects.size(); i++) {
    data.append(d->objects[i]->render(this));
  }
  data = headerGuid + ByteVector::fromLongLong(data.size() + 30, false) + ByteVector::fromUInt(d->objects.size(), false) + ByteVector("\x01\x02", 2) + data;
  insert(data, 0, d->size);

  return true;
}

////////////////////////////////////////////////////////////////////////////////
// protected members
////////////////////////////////////////////////////////////////////////////////

int ASF::File::readBYTE()
{
  ByteVector v = readBlock(1);
  return v[0];
}

int ASF::File::readWORD()
{
  ByteVector v = readBlock(2);
  return v.toShort(false);
}

unsigned int ASF::File::readDWORD()
{
  ByteVector v = readBlock(4);
  return v.toUInt(false);
}

long long ASF::File::readQWORD()
{
  ByteVector v = readBlock(8);
  return v.toLongLong(false);
}

String
ASF::File::readString(int length)
{
  ByteVector data = readBlock(length);
  unsigned int size = data.size();
  while (size >= 2) {
    if(data[size - 1] != '\0' || data[size - 2] != '\0') {
      break;
    }
    size -= 2;
  }
  if(size != data.size()) {
    data.resize(size);
  }
  return String(data, String::UTF16LE);
}

ByteVector
ASF::File::renderString(const String &str, bool includeLength)
{
  ByteVector data = str.data(String::UTF16LE) + ByteVector::fromShort(0, false);
  if(includeLength) {
    data = ByteVector::fromShort(data.size(), false) + data;
  }
  return data;
}