Esempi in C++ (Cpp) per TextIdentificationFrame::setTextEncoding

Esempio n. 1

File: id3v2framefactory.cpp Progetto: mderezynski/taglib-gio

Frame *FrameFactory::createFrame(const ByteVector &data, uint version) const
{
  Frame::Header *header = new Frame::Header(data, version);
  ByteVector frameID = header->frameID();

  // A quick sanity check -- make sure that the frameID is 4 uppercase Latin1
  // characters.  Also make sure that there is data in the frame.

  if(!frameID.size() == (version < 3 ? 3 : 4) ||
     header->frameSize() <= 0 ||
     header->frameSize() > data.size())
  {
    delete header;
    return 0;
  }

  for(ByteVector::ConstIterator it = frameID.begin(); it != frameID.end(); it++) {
    if( (*it < 'A' || *it > 'Z') && (*it < '1' || *it > '9') ) {
      delete header;
      return 0;
    }
  }

  // TagLib doesn't mess with encrypted frames, so just treat them
  // as unknown frames.

#if HAVE_ZLIB == 0
  if(header->compression()) {
    debug("Compressed frames are currently not supported.");
    return new UnknownFrame(data, header);
  }
#endif
  if(header->encryption()) {
    debug("Encrypted frames are currently not supported.");
    return new UnknownFrame(data, header);
  }

  if(!updateFrame(header)) {
    header->setTagAlterPreservation(true);
    return new UnknownFrame(data, header);
  }

  // updateFrame() might have updated the frame ID.

  frameID = header->frameID();

  // This is where things get necissarily nasty.  Here we determine which
  // Frame subclass (or if none is found simply an Frame) based
  // on the frame ID.  Since there are a lot of possibilities, that means
  // a lot of if blocks.

  // Text Identification (frames 4.2)

  if(frameID.startsWith("T")) {
    TextIdentificationFrame *f = frameID != "TXXX"
      ? new TextIdentificationFrame(data, header)
      : new UserTextIdentificationFrame(data, header);

    if(d->useDefaultEncoding)
      f->setTextEncoding(d->defaultEncoding);

    if(frameID == "TCON")
      updateGenre(f);

    return f;
  }

  // Comments (frames 4.10)

  if(frameID == "COMM") {
    CommentsFrame *f = new CommentsFrame(data, header);
    if(d->useDefaultEncoding)
      f->setTextEncoding(d->defaultEncoding);
    return f;
  }

  // Attached Picture (frames 4.14)

  if(frameID == "APIC") {
    AttachedPictureFrame *f = new AttachedPictureFrame(data, header);
    if(d->useDefaultEncoding)
      f->setTextEncoding(d->defaultEncoding);
    return f;
  }

  // Relative Volume Adjustment (frames 4.11)

  if(frameID == "RVA2")
    return new RelativeVolumeFrame(data, header);

  // Unique File Identifier (frames 4.1)

  if(frameID == "UFID")
    return new UniqueFileIdentifierFrame(data, header);

  // General Encapsulated Object (frames 4.15)

  if(frameID == "GEOB")
    return new GeneralEncapsulatedObjectFrame(data, header);

  return new UnknownFrame(data, header);
}