mp4mdiabox.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 112 行

/***************************************************************************
    copyright            : (C) 2002, 2003, 2006 by Jochen Issing
    email                : [e-mail]
 ***************************************************************************/

/***************************************************************************
 *   This library is free software; you can redistribute it and/or modify  *
 *   it  under the terms of the GNU Lesser General Public License version  *
 *   2.1 as published by the Free Software Foundation.                     *
 *                                                                         *
 *   This library is distributed in the hope that it will be useful, but   *
 *   WITHOUT ANY WARRANTY; without even the implied warranty of            *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU     *
 *   Lesser General Public License for more details.                       *
 *                                                                         *
 *   You should have received a copy of the GNU Lesser General Public      *
 *   License along with this library; if not, write to the Free Software   *
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,            *
 *   MA  02110-1301  USA                                                   *
 ***************************************************************************/

#include "tlist.h"
#include <iostream>
#include "mp4mdiabox.h"
#include "mp4hdlrbox.h"
#include "mp4minfbox.h"
#include "boxfactory.h"
#include "mp4file.h"

using namespace TagLib;

class MP4::Mp4MdiaBox::Mp4MdiaBoxPrivate
{
public:
  //! container for all boxes in mdia box
  TagLib::List<Mp4IsoBox*> mdiaBoxes;
  //! a box factory for creating the appropriate boxes
  MP4::BoxFactory        boxfactory;
}; // class Mp4MdiaBoxPrivate

MP4::Mp4MdiaBox::Mp4MdiaBox( TagLib::File* file, MP4::Fourcc fourcc, TagLib::uint size, long offset )
	: Mp4IsoBox( file, fourcc, size, offset )
{
  d = new MP4::Mp4MdiaBox::Mp4MdiaBoxPrivate();
}

MP4::Mp4MdiaBox::~Mp4MdiaBox()
{
  TagLib::List<Mp4IsoBox*>::Iterator delIter;
  for( delIter  = d->mdiaBoxes.begin();
       delIter != d->mdiaBoxes.end();
       delIter++ )
  {
    delete *delIter;
  }
  delete d;
}

void MP4::Mp4MdiaBox::parse()
{
  TagLib::MP4::File* mp4file = static_cast<MP4::File*>( file() );

  TagLib::uint totalsize = 8;
  // parse all contained boxes
  TagLib::uint size;
  MP4::Fourcc  fourcc;

  // stores the current handler type
  TagLib::MP4::Fourcc hdlrtype;

  while( (mp4file->readSizeAndType( size, fourcc ) == true)  )
  {
    totalsize += size;

    // check for errors
    if( totalsize > MP4::Mp4IsoBox::size() )
    {
      std::cerr << "Error in mp4 file " << mp4file->name() << " mdia box contains bad box with name: " << fourcc.toString() << std::endl;
      return;
    }

    // create the appropriate subclass and parse it
    MP4::Mp4IsoBox* curbox = d->boxfactory.createInstance( mp4file, fourcc, size, mp4file->tell() );
    if( static_cast<TagLib::uint>( fourcc ) == 0x6d696e66 /*"minf"*/ )
    {
      // cast to minf
      Mp4MinfBox* minfbox = dynamic_cast<Mp4MinfBox*>( curbox );
      if(!minfbox)
	return;
      // set handler type
      minfbox->setHandlerType( hdlrtype );
    }

    curbox->parsebox();
    d->mdiaBoxes.append( curbox );

    if(static_cast<TagLib::uint>( fourcc ) == 0x68646c72 /*"hdlr"*/ )
    {
      // cast to hdlr box
      Mp4HdlrBox* hdlrbox = dynamic_cast<Mp4HdlrBox*>( curbox );
      if(!hdlrbox)
	return;
      // get handler type
      hdlrtype = hdlrbox->hdlr_type();
    }
    // check for end of mdia box
    if( totalsize == MP4::Mp4IsoBox::size() )
      break;

  }
}