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

/**************************************************************************
    copyright            : (C) 2005-2007 by Lukáš Lalinský
    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  *
 *   USA                                                                   *
 ***************************************************************************/

#include <tbytevectorlist.h>
#include <tstring.h>
#include "asffile.h"
#include "asftag.h"
#include "asfproperties.h"

using namespace TagLib;

class ASF::File::FilePrivate
{
public:
  FilePrivate():
    size(0),
    tag(0),
    properties(0),
    contentDescriptionObject(0),
    extendedContentDescriptionObject(0),
    headerExtensionObject(0),
    metadataObject(0),
    metadataLibraryObject(0) {}
  unsigned long long size;
  ASF::Tag *tag;
  ASF::Properties *properties;
  List<ASF::File::BaseObject *> objects;
  ASF::File::ContentDescriptionObject *contentDescriptionObject;
  ASF::File::ExtendedContentDescriptionObject *extendedContentDescriptionObject;
  ASF::File::HeaderExtensionObject *headerExtensionObject;
  ASF::File::MetadataObject *metadataObject;
  ASF::File::MetadataLibraryObject *metadataLibraryObject;
};

static ByteVector headerGuid("\x30\x26\xB2\x75\x8E\x66\xCF\x11\xA6\xD9\x00\xAA\x00\x62\xCE\x6C", 16);
static ByteVector filePropertiesGuid("\xA1\xDC\xAB\x8C\x47\xA9\xCF\x11\x8E\xE4\x00\xC0\x0C\x20\x53\x65", 16);
static ByteVector streamPropertiesGuid("\x91\x07\xDC\xB7\xB7\xA9\xCF\x11\x8E\xE6\x00\xC0\x0C\x20\x53\x65", 16);
static ByteVector contentDescriptionGuid("\x33\x26\xB2\x75\x8E\x66\xCF\x11\xA6\xD9\x00\xAA\x00\x62\xCE\x6C", 16);
static ByteVector extendedContentDescriptionGuid("\x40\xA4\xD0\xD2\x07\xE3\xD2\x11\x97\xF0\x00\xA0\xC9\x5E\xA8\x50", 16);
static ByteVector headerExtensionGuid("\xb5\x03\xbf_.\xa9\xcf\x11\x8e\xe3\x00\xc0\x0c Se", 16);
static ByteVector metadataGuid("\xEA\xCB\xF8\xC5\xAF[wH\204g\xAA\214D\xFAL\xCA", 16);
static ByteVector metadataLibraryGuid("\224\034#D\230\224\321I\241A\x1d\x13NEpT", 16);

class ASF::File::BaseObject
{
public:
  ByteVector data;
  virtual ~BaseObject() {}
  virtual ByteVector guid() = 0;
  virtual void parse(ASF::File *file, unsigned int size);
  virtual ByteVector render(ASF::File *file);
};

class ASF::File::UnknownObject : public ASF::File::BaseObject
{
  ByteVector myGuid;
public:
  UnknownObject(const ByteVector &guid);
  ByteVector guid();
};

class ASF::File::FilePropertiesObject : public ASF::File::BaseObject
{
public:
  ByteVector guid();
  void parse(ASF::File *file, uint size);
};

class ASF::File::StreamPropertiesObject : public ASF::File::BaseObject
{
public:
  ByteVector guid();
  void parse(ASF::File *file, uint size);
};

class ASF::File::ContentDescriptionObject : public ASF::File::BaseObject
{
public:
  ByteVector guid();
  void parse(ASF::File *file, uint size);
  ByteVector render(ASF::File *file);
};

class ASF::File::ExtendedContentDescriptionObject : public ASF::File::BaseObject
{
public:
  ByteVectorList attributeData;
  ByteVector guid();
  void parse(ASF::File *file, uint size);
  ByteVector render(ASF::File *file);
};

class ASF::File::MetadataObject : public ASF::File::BaseObject
{
public:
  ByteVectorList attributeData;
  ByteVector guid();
  void parse(ASF::File *file, uint size);
  ByteVector render(ASF::File *file);
};

class ASF::File::MetadataLibraryObject : public ASF::File::BaseObject
{
public:
  ByteVectorList attributeData;
  ByteVector guid();
  void parse(ASF::File *file, uint size);
  ByteVector render(ASF::File *file);
};

class ASF::File::HeaderExtensionObject : public ASF::File::BaseObject
{
public:
  List<ASF::File::BaseObject *> objects;
  ByteVector guid();
  void parse(ASF::File *file, uint size);
  ByteVector render(ASF::File *file);
};

void
ASF::File::BaseObject::parse(ASF::File *file, unsigned int size)
{
  data = file->readBlock(size - 24);
}

ByteVector
ASF::File::BaseObject::render(ASF::File * /*file*/)
{
  return guid() + ByteVector::fromLongLong(data.size() + 24, false) + data;
}

ASF::File::UnknownObject::UnknownObject(const ByteVector &guid) : myGuid(guid)
{
}

ByteVector
ASF::File::UnknownObject::guid()
{
  return myGuid;
}

ByteVector
ASF::File::FilePropertiesObject::guid()
{
  return filePropertiesGuid;
}

void
ASF::File::FilePropertiesObject::parse(ASF::File *file, uint size)
{
  BaseObject::parse(file, size);
  file->d->properties->setLength((int)(data.mid(40, 8).toLongLong(false) / 10000000L - data.mid(56, 8).toLongLong(false) / 1000L));
}

ByteVector
ASF::File::StreamPropertiesObject::guid()
{
  return streamPropertiesGuid;
}

void
ASF::File::StreamPropertiesObject::parse(ASF::File *file, uint size)
{
  BaseObject::parse(file, size);
  file->d->properties->setChannels(data.mid(56, 2).toShort(false));
  file->d->properties->setSampleRate(data.mid(58, 4).toUInt(false));
  file->d->properties->setBitrate(data.mid(62, 4).toUInt(false) * 8 / 1000);
}

ByteVector
ASF::File::ContentDescriptionObject::guid()
{
  return contentDescriptionGuid;
}

void
ASF::File::ContentDescriptionObject::parse(ASF::File *file, uint /*size*/)
{
  file->d->contentDescriptionObject = this;
  int titleLength = file->readWORD();
  int artistLength = file->readWORD();
  int copyrightLength = file->readWORD();
  int commentLength = file->readWORD();
  int ratingLength = file->readWORD();
  file->d->tag->setTitle(file->readString(titleLength));
  file->d->tag->setArtist(file->readString(artistLength));
  file->d->tag->setCopyright(file->readString(copyrightLength));
  file->d->tag->setComment(file->readString(commentLength));
  file->d->tag->setRating(file->readString(ratingLength));
}

ByteVector
ASF::File::ContentDescriptionObject::render(ASF::File *file)
{
  ByteVector v1 = file->renderString(file->d->tag->title());
  ByteVector v2 = file->renderString(file->d->tag->artist());
  ByteVector v3 = file->renderString(file->d->tag->copyright());
  ByteVector v4 = file->renderString(file->d->tag->comment());
  ByteVector v5 = file->renderString(file->d->tag->rating());
  data.clear();
  data.append(ByteVector::fromShort(v1.size(), false));
  data.append(ByteVector::fromShort(v2.size(), false));
  data.append(ByteVector::fromShort(v3.size(), false));
  data.append(ByteVector::fromShort(v4.size(), false));
  data.append(ByteVector::fromShort(v5.size(), false));
  data.append(v1);
  data.append(v2);
  data.append(v3);
  data.append(v4);
  data.append(v5);
  return BaseObject::render(file);
}

ByteVector
ASF::File::ExtendedContentDescriptionObject::guid()
{
  return extendedContentDescriptionGuid;
}

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

ByteVector
ASF::File::ExtendedContentDescriptionObject::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::MetadataObject::guid()
{
  return metadataGuid;
}

void
ASF::File::MetadataObject::parse(ASF::File *file, uint /*size*/)
{
  file->d->metadataObject = this;
  int count = file->readWORD();
  while(count--) {
    ASF::Attribute attribute;
    String name = attribute.parse(*file, 1);
    file->d->tag->addAttribute(name, attribute);
  }