This is starting to look more sane.

git-svn-id: svn://anonsvn.kde.org/home/kde/trunk/kdesupport/taglib@588022 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

taglib/mpc/CMakeLists.txt

@@ -0,0 +1 @@
+INSTALL( FILES  mpcfile.h mpcproperties.h DESTINATION ${INCLUDE_INSTALL_DIR}/taglib)

taglib/mpc/Makefile.am

@@ -0,0 +1,16 @@
+INCLUDES = \
+	-I$(top_srcdir)/taglib \
+	-I$(top_srcdir)/taglib/toolkit \
+	-I$(top_srcdir)/taglib/ape \
+	-I$(top_srcdir)/taglib/mpeg/id3v1 \
+	-I$(top_srcdir)/taglib/mpeg/id3v2 \
+	$(all_includes)
+
+noinst_LTLIBRARIES = libmpc.la
+
+libmpc_la_SOURCES = mpcfile.cpp mpcproperties.cpp
+
+taglib_include_HEADERS = mpcfile.h mpcproperties.h
+taglib_includedir = $(includedir)/taglib
+
+EXTRA_DIST = $(libmpc_la_SOURCES) $(taglib_include_HEADERS)

taglib/mpc/combinedtag.h

@@ -0,0 +1,171 @@
+/***************************************************************************
+    copyright            : (C) 2004 by Allan Sandfeld Jensen
+    email                : kde@carewolf.org
+ ***************************************************************************/
+
+/***************************************************************************
+ *   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                                                                   *
+ ***************************************************************************/
+
+#ifndef DO_NOT_DOCUMENT // Tell Doxygen not to document this header
+
+#ifndef TAGLIB_COMBINEDTAG_H
+#define TAGLIB_COMBINEDTAG_H
+
+////////////////////////////////////////////////////////////////////////////////
+// Note that this header is not installed.
+////////////////////////////////////////////////////////////////////////////////
+
+#include <tag.h>
+
+namespace TagLib {
+
+  /*!
+   * A union of two TagLib::Tags.
+   */
+  class CombinedTag : public TagLib::Tag
+  {
+  public:
+    CombinedTag(Tag *tag1 = 0, Tag *tag2 = 0)
+               : TagLib::Tag(),
+                 tag1(tag1), tag2(tag2) {}
+
+    virtual String title() const {
+      if(tag1 && !tag1->title().isEmpty())
+          return tag1->title();
+
+      if(tag2)
+          return tag2->title();
+
+      return String::null;
+    }
+
+    virtual String artist() const {
+      if(tag1 && !tag1->artist().isEmpty())
+          return tag1->artist();
+
+      if(tag2)
+          return tag2->artist();
+
+      return String::null;
+    }
+
+    virtual String album() const {
+      if(tag1 && !tag1->album().isEmpty())
+          return tag1->album();
+
+      if(tag2)
+          return tag2->album();
+
+      return String::null;
+    }
+
+    virtual String comment() const {
+      if(tag1 && !tag1->comment().isEmpty())
+          return tag1->comment();
+
+      if(tag2)
+          return tag2->comment();
+
+      return String::null;
+    }
+
+    virtual String genre() const {
+      if(tag1 && !tag1->genre().isEmpty())
+          return tag1->genre();
+
+      if(tag2)
+          return tag2->genre();
+
+      return String::null;
+    }
+
+    virtual uint year() const {
+      if(tag1 && tag1->year() > 0)
+          return tag1->year();
+
+      if(tag2)
+          return tag2->year();
+
+      return 0;
+    }
+
+    virtual uint track() const {
+      if(tag1 && tag1->track() > 0)
+          return tag1->track();
+
+      if(tag2)
+          return tag2->track();
+
+      return 0;
+    }
+
+    virtual void setTitle(const String &s) {
+      if(tag1)
+          tag1->setTitle(s);
+      if(tag2)
+          tag2->setTitle(s);
+    }
+
+    virtual void setArtist(const String &s) {
+      if(tag1)
+          tag1->setArtist(s);
+      if(tag2)
+          tag2->setArtist(s);
+    }
+
+    virtual void setAlbum(const String &s) {
+      if(tag1)
+          tag1->setAlbum(s);
+      if(tag2)
+          tag2->setAlbum(s);
+    }
+
+    virtual void setComment(const String &s) {
+      if(tag1)
+          tag1->setComment(s);
+      if(tag2)
+          tag2->setComment(s);
+    }
+
+    virtual void setGenre(const String &s) {
+      if(tag1)
+          tag1->setGenre(s);
+      if(tag2)
+          tag2->setGenre(s);
+    }
+
+    virtual void setYear(uint i) {
+      if(tag1)
+          tag1->setYear(i);
+      if(tag2)
+          tag2->setYear(i);
+    }
+
+    virtual void setTrack(uint i) {
+      if(tag1)
+          tag1->setTrack(i);
+      if(tag2)
+          tag2->setTrack(i);
+    }
+
+  private:
+      Tag *tag1;
+      Tag *tag2;
+  };
+}
+
+#endif
+#endif

taglib/mpc/mpcfile.cpp

@@ -0,0 +1,361 @@
+/***************************************************************************
+    copyright            : (C) 2004 by Allan Sandfeld Jensen
+    email                : kde@carewolf.org
+ ***************************************************************************/
+
+/***************************************************************************
+ *   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 <tbytevector.h>
+#include <tstring.h>
+#include <tdebug.h>
+
+#include "mpcfile.h"
+#include "id3v1tag.h"
+#include "id3v2header.h"
+#include "apetag.h"
+#include "apefooter.h"
+#include "combinedtag.h"
+
+using namespace TagLib;
+
+class MPC::File::FilePrivate
+{
+public:
+  FilePrivate() :
+    APETag(0),
+    APELocation(-1),
+    APESize(0),
+    ID3v1Tag(0),
+    ID3v1Location(-1),
+    ID3v2Header(0),
+    ID3v2Location(-1),
+    ID3v2Size(0),
+    tag(0),
+    properties(0),
+    scanned(false),
+    hasAPE(false),
+    hasID3v1(false),
+    hasID3v2(false) {}
+
+  ~FilePrivate()
+  {
+    if (tag != ID3v1Tag && tag != APETag) delete tag;
+    delete ID3v1Tag;
+    delete APETag;
+    delete ID3v2Header;
+    delete properties;
+  }
+
+  APE::Tag *APETag;
+  // long APEFooter;
+  long APELocation;
+  uint APESize;
+
+  ID3v1::Tag *ID3v1Tag;
+  long ID3v1Location;
+
+  ID3v2::Header *ID3v2Header;
+  long ID3v2Location;
+  uint ID3v2Size;
+
+  Tag *tag;
+
+  Properties *properties;
+  bool scanned;
+
+  // These indicate whether the file *on disk* has these tags, not if
+  // this data structure does.  This is used in computing offsets.
+
+  bool hasAPE;
+  bool hasID3v1;
+  bool hasID3v2;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+// public members
+////////////////////////////////////////////////////////////////////////////////
+
+MPC::File::File(const char *file, bool readProperties,
+                Properties::ReadStyle propertiesStyle) : TagLib::File(file)
+{
+  d = new FilePrivate;
+  read(readProperties, propertiesStyle);
+}
+
+MPC::File::~File()
+{
+  delete d;
+}
+
+TagLib::Tag *MPC::File::tag() const
+{
+  return d->tag;
+}
+
+MPC::Properties *MPC::File::audioProperties() const
+{
+  return d->properties;
+}
+
+bool MPC::File::save()
+{
+  if(readOnly()) {
+    debug("MPC::File::save() -- File is read only.");
+    return false;
+  }
+
+  // Possibly strip ID3v2 tag
+
+  if(d->hasID3v2 && !d->ID3v2Header) {
+    removeBlock(d->ID3v2Location, d->ID3v2Size);
+    d->hasID3v2 = false;
+    if(d->hasID3v1)
+      d->ID3v1Location -= d->ID3v2Size;
+    if(d->hasAPE)
+      d->APELocation -= d->ID3v2Size;
+  }
+
+  // Update ID3v1 tag
+
+  if(d->ID3v1Tag) {
+    if(d->hasID3v1) {
+      seek(d->ID3v1Location);
+      writeBlock(d->ID3v1Tag->render());
+    }
+    else {
+      seek(0, End);
+      d->ID3v1Location = tell();
+      writeBlock(d->ID3v1Tag->render());
+      d->hasID3v1 = true;
+    }
+  } else
+    if(d->hasID3v1) {
+      removeBlock(d->ID3v1Location, 128);
+      d->hasID3v1 = false;
+      if(d->hasAPE) {
+        if(d->APELocation > d->ID3v1Location)
+          d->APELocation -= 128;
+      }
+    }
+
+  // Update APE tag
+
+  if(d->APETag) {
+    if(d->hasAPE)
+      insert(d->APETag->render(), d->APELocation, d->APESize);
+    else {
+      if(d->hasID3v1)  {
+        insert(d->APETag->render(), d->ID3v1Location, 0);
+        d->APESize = d->APETag->footer()->completeTagSize();
+        d->hasAPE = true;
+        d->APELocation = d->ID3v1Location;
+        d->ID3v1Location += d->APESize;
+      }
+      else {
+        seek(0, End);
+        d->APELocation = tell();
+        writeBlock(d->APETag->render());
+        d->APESize = d->APETag->footer()->completeTagSize();
+        d->hasAPE = true;
+      }
+    }
+  }
+  else
+    if(d->hasAPE) {
+      removeBlock(d->APELocation, d->APESize);
+      d->hasAPE = false;
+      if(d->hasID3v1) {
+        if (d->ID3v1Location > d->APELocation)
+          d->ID3v1Location -= d->APESize;
+      }
+    }
+
+  return true;
+}
+
+ID3v1::Tag *MPC::File::ID3v1Tag(bool create)
+{
+  if(!create || d->ID3v1Tag)
+    return d->ID3v1Tag;
+
+  // no ID3v1 tag exists and we've been asked to create one
+
+  d->ID3v1Tag = new ID3v1::Tag;
+
+  if(d->APETag)
+    d->tag = new CombinedTag(d->APETag, d->ID3v1Tag);
+  else
+    d->tag = d->ID3v1Tag;
+
+  return d->ID3v1Tag;
+}
+
+APE::Tag *MPC::File::APETag(bool create)
+{
+  if(!create || d->APETag)
+    return d->APETag;
+
+  // no APE tag exists and we've been asked to create one
+
+  d->APETag = new APE::Tag;
+
+  if(d->ID3v1Tag)
+    d->tag = new CombinedTag(d->APETag, d->ID3v1Tag);
+  else
+    d->tag = d->APETag;
+
+  return d->APETag;
+}
+
+void MPC::File::remove(int tags)
+{
+  if(tags & ID3v1) {
+    delete d->ID3v1Tag;
+    d->ID3v1Tag = 0;
+
+    if(d->APETag)
+      d->tag = d->APETag;
+    else
+      d->tag = d->APETag = new APE::Tag;
+  }
+
+  if(tags & ID3v2) {
+    delete d->ID3v2Header;
+    d->ID3v2Header = 0;
+  }
+
+  if(tags & APE) {
+    delete d->APETag;
+    d->APETag = 0;
+
+    if(d->ID3v1Tag)
+      d->tag = d->ID3v1Tag;
+    else
+      d->tag = d->APETag = new APE::Tag;
+  }
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+// private members
+////////////////////////////////////////////////////////////////////////////////
+
+void MPC::File::read(bool readProperties, Properties::ReadStyle /* propertiesStyle */)
+{
+  // Look for an ID3v1 tag
+
+  d->ID3v1Location = findID3v1();
+
+  if(d->ID3v1Location >= 0) {
+    d->ID3v1Tag = new ID3v1::Tag(this, d->ID3v1Location);
+    d->hasID3v1 = true;
+  }
+
+  // Look for an APE tag
+
+  findAPE();
+
+  d->APELocation = findAPE();
+
+  if(d->APELocation >= 0) {
+    d->APETag = new APE::Tag(this, d->APELocation);
+    d->APESize = d->APETag->footer()->completeTagSize();
+    d->APELocation = d->APELocation + d->APETag->footer()->size() - d->APESize;
+    d->hasAPE = true;
+  }
+
+  if(d->hasID3v1 && d->hasAPE)
+    d->tag = new CombinedTag(d->APETag, d->ID3v1Tag);
+  else {
+    if(d->hasID3v1)
+      d->tag = d->ID3v1Tag;
+    else {
+      if(d->hasAPE)
+        d->tag = d->APETag;
+      else
+        d->tag = d->APETag = new APE::Tag;
+    }
+  }
+
+  // Look for and skip an ID3v2 tag
+
+  d->ID3v2Location = findID3v2();
+
+  if(d->ID3v2Location >= 0) {
+    seek(d->ID3v2Location);
+    d->ID3v2Header = new ID3v2::Header(readBlock(ID3v2::Header::size()));
+    d->ID3v2Size = d->ID3v2Header->completeTagSize();
+    d->hasID3v2 = true;
+  }
+
+  if(d->hasID3v2)
+    seek(d->ID3v2Location + d->ID3v2Size);
+  else
+    seek(0);
+
+  // Look for MPC metadata
+
+  if(readProperties) {
+    d->properties = new Properties(readBlock(MPC::HeaderSize),
+                                   length() - d->ID3v2Size - d->APESize);
+  }
+}
+
+long MPC::File::findAPE()
+{
+  if(!isValid())
+    return -1;
+
+  if(d->hasID3v1)
+    seek(-160, End);
+  else
+    seek(-32, End);
+
+  long p = tell();
+
+  if(readBlock(8) == APE::Tag::fileIdentifier())
+    return p;
+
+  return -1;
+}
+
+long MPC::File::findID3v1()
+{
+  if(!isValid())
+    return -1;
+
+  seek(-128, End);
+  long p = tell();
+
+  if(readBlock(3) == ID3v1::Tag::fileIdentifier())
+    return p;
+
+  return -1;
+}
+
+long MPC::File::findID3v2()
+{
+  if(!isValid())
+    return -1;
+
+  seek(0);
+
+  if(readBlock(3) == ID3v2::Header::fileIdentifier())
+    return 0;
+
+  return -1;
+}

taglib/mpc/mpcfile.h

@@ -0,0 +1,162 @@
+/***************************************************************************
+    copyright            : (C) 2004 by Allan Sandfeld Jensen
+    email                : kde@carewolf.org
+ ***************************************************************************/
+
+/***************************************************************************
+ *   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                                                                   *
+ ***************************************************************************/
+
+#ifndef TAGLIB_MPCFILE_H
+#define TAGLIB_MPCFILE_H
+
+#include "tfile.h"
+
+#include "mpcproperties.h"
+
+namespace TagLib {
+
+  class Tag;
+
+  namespace ID3v1 { class Tag; }
+  namespace APE { class Tag; }
+
+  //! An implementation of MPC metadata
+
+  /*!
+   * This is implementation of MPC metadata.
+   *
+   * This supports ID3v1 and APE (v1 and v2) style comments as well as reading stream
+   * properties from the file. ID3v2 tags are invalid in MPC-files, but will be skipped
+   * and ignored.
+   */
+
+  namespace MPC {
+
+    //! An implementation of TagLib::File with MPC specific methods
+
+    /*!
+     * This implements and provides an interface for MPC files to the
+     * TagLib::Tag and TagLib::AudioProperties interfaces by way of implementing
+     * the abstract TagLib::File API as well as providing some additional
+     * information specific to MPC files.
+     * The only invalid tag combination supported is an ID3v1 tag after an APE tag.
+     */
+
+    class File : public TagLib::File
+    {
+    public:
+      /*!
+       * This set of flags is used for various operations and is suitable for
+       * being OR-ed together.
+       */
+      enum TagTypes {
+        //! Empty set.  Matches no tag types.
+        NoTags  = 0x0000,
+        //! Matches ID3v1 tags.
+        ID3v1   = 0x0001,
+        //! Matches ID3v2 tags.
+        ID3v2   = 0x0002,
+        //! Matches APE tags.
+        APE     = 0x0004,
+        //! Matches all tag types.
+        AllTags = 0xffff
+      };
+
+      /*!
+       * Contructs an MPC file from \a file.  If \a readProperties is true the
+       * file's audio properties will also be read using \a propertiesStyle.  If
+       * false, \a propertiesStyle is ignored.
+       */
+      File(const char *file, bool readProperties = true,
+           Properties::ReadStyle propertiesStyle = Properties::Average);
+
+      /*!
+       * Destroys this instance of the File.
+       */
+      virtual ~File();
+
+      /*!
+       * Returns the Tag for this file.  This will be an APE tag, an ID3v1 tag
+       * or a combination of the two.
+       */
+      virtual TagLib::Tag *tag() const;
+
+      /*!
+       * Returns the MPC::Properties for this file.  If no audio properties
+       * were read then this will return a null pointer.
+       */
+      virtual Properties *audioProperties() const;
+
+      /*!
+       * Saves the file.
+       */
+      virtual bool save();
+
+      /*!
+       * Returns a pointer to the ID3v1 tag of the file.
+       *
+       * If \a create is false (the default) this will return a null pointer
+       * if there is no valid ID3v1 tag.  If \a create is true it will create
+       * an ID3v1 tag if one does not exist. If there is already an APE tag, the
+       * new ID3v1 tag will be placed after it.
+       *
+       * \note The Tag <b>is still</b> owned by the APE::File and should not be
+       * deleted by the user.  It will be deleted when the file (object) is
+       * destroyed.
+       */
+      ID3v1::Tag *ID3v1Tag(bool create = false);
+
+      /*!
+       * Returns a pointer to the APE tag of the file.
+       *
+       * If \a create is false (the default) this will return a null pointer
+       * if there is no valid APE tag.  If \a create is true it will create
+       * a APE tag if one does not exist. If there is already an ID3v1 tag, thes
+       * new APE tag will be placed before it.
+       *
+       * \note The Tag <b>is still</b> owned by the APE::File and should not be
+       * deleted by the user.  It will be deleted when the file (object) is
+       * destroyed.
+       */
+      APE::Tag *APETag(bool create = false);
+
+      /*!
+       * This will remove the tags that match the OR-ed together TagTypes from the
+       * file.  By default it removes all tags.
+       *
+       * \note This will also invalidate pointers to the tags
+       * as their memory will be freed.
+       * \note In order to make the removal permanent save() still needs to be called
+       */
+      void remove(int tags = AllTags);
+
+    private:
+      File(const File &);
+      File &operator=(const File &);
+
+      void read(bool readProperties, Properties::ReadStyle propertiesStyle);
+      void scan();
+      long findAPE();
+      long findID3v1();
+      long findID3v2();
+
+      class FilePrivate;
+      FilePrivate *d;
+    };
+  }
+}
+
+#endif

taglib/mpc/mpcproperties.cpp

@@ -0,0 +1,140 @@
+/***************************************************************************
+    copyright            : (C) 2004 by Allan Sandfeld Jensen
+    email                : kde@carewolf.org
+ ***************************************************************************/
+
+/***************************************************************************
+ *   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 <tstring.h>
+#include <tdebug.h>
+#include <bitset>
+
+#include "mpcproperties.h"
+#include "mpcfile.h"
+
+using namespace TagLib;
+
+class MPC::Properties::PropertiesPrivate
+{
+public:
+  PropertiesPrivate(const ByteVector &d, long length, ReadStyle s) :
+    data(d),
+    streamLength(length),
+    style(s),
+    version(0),
+    length(0),
+    bitrate(0),
+    sampleRate(0),
+    channels(0) {}
+
+  ByteVector data;
+  long streamLength;
+  ReadStyle style;
+  int version;
+  int length;
+  int bitrate;
+  int sampleRate;
+  int channels;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+// public members
+////////////////////////////////////////////////////////////////////////////////
+
+MPC::Properties::Properties(const ByteVector &data, long streamLength, ReadStyle style) : AudioProperties(style)
+{
+  d = new PropertiesPrivate(data, streamLength, style);
+  read();
+}
+
+MPC::Properties::~Properties()
+{
+  delete d;
+}
+
+int MPC::Properties::length() const
+{
+  return d->length;
+}
+
+int MPC::Properties::bitrate() const
+{
+  return d->bitrate;
+}
+
+int MPC::Properties::sampleRate() const
+{
+  return d->sampleRate;
+}
+
+/*
+int MPC::Properties::sampleWidth() const
+{
+  return d->sampleWidth;
+}
+*/
+
+int MPC::Properties::channels() const
+{
+  return d->channels;
+}
+
+int MPC::Properties::mpcVersion() const
+{
+  return d->version;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// private members
+////////////////////////////////////////////////////////////////////////////////
+
+static const unsigned short sftable [4] = { 44100, 48000, 37800, 32000 };
+
+void MPC::Properties::read()
+{
+  if(!d->data.startsWith("MP+"))
+    return;
+
+  d->version = d->data[3] & 15;
+
+  unsigned int frames;
+
+  if(d->version >= 7) {
+    frames = d->data.mid(4, 4).toUInt(false);
+
+    std::bitset<32> flags = d->data.mid(8, 4).toUInt(false);
+    d->sampleRate = sftable[flags[17] * 2 + flags[16]];
+    d->channels = 2;
+  }
+  else {
+    unsigned int headerData = d->data.mid(0, 4).toUInt(false);
+    d->bitrate = (headerData >> 23) & 0x01ff;
+    d->version = (headerData >> 11) & 0x03ff;
+    d->sampleRate = 44100;
+    d->channels = 2;
+    if(d->version >= 5)
+      frames = d->data.mid(4, 4).toUInt(false);
+    else
+      frames = d->data.mid(4, 2).toUInt(false);
+  }
+
+  unsigned int samples = frames * 1152 - 576;
+  d->length = d->sampleRate > 0 ? (samples + (d->sampleRate / 2)) / d->sampleRate : 0;
+
+  if(!d->bitrate)
+    d->bitrate = d->length > 0 ? ((d->streamLength * 8L) / d->length) / 1000 : 0;
+}

taglib/mpc/mpcproperties.h

@@ -0,0 +1,77 @@
+/***************************************************************************
+    copyright            : (C) 2004 by Allan Sandfeld Jensen
+    email                : kde@carewolf.org
+ ***************************************************************************/
+
+/***************************************************************************
+ *   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                                                                   *
+ ***************************************************************************/
+
+#ifndef TAGLIB_MPCPROPERTIES_H
+#define TAGLIB_MPCPROPERTIES_H
+
+#include "audioproperties.h"
+
+namespace TagLib {
+
+  namespace MPC {
+
+    class File;
+
+    static const uint HeaderSize = 8*7;
+
+    //! An implementation of audio property reading for MPC
+
+    /*!
+     * This reads the data from an MPC stream found in the AudioProperties
+     * API.
+     */
+
+    class Properties : public AudioProperties
+    {
+    public:
+      /*!
+       * Create an instance of MPC::Properties with the data read from the
+       * ByteVector \a data.
+       */
+      Properties(const ByteVector &data, long streamLength, ReadStyle style = Average);
+
+      /*!
+       * Destroys this MPC::Properties instance.
+       */
+      virtual ~Properties();
+
+      // Reimplementations.
+
+      virtual int length() const;
+      virtual int bitrate() const;
+      virtual int sampleRate() const;
+      virtual int channels() const;
+
+      /*!
+       * Returns the version of the bitstream (SV4-SV7)
+       */
+      int mpcVersion() const;
+
+    private:
+      void read();
+
+      class PropertiesPrivate;
+      PropertiesPrivate *d;
+    };
+  }
+}
+
+#endif