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mpeg/xingheader.cpp

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+/***************************************************************************
+    copyright            : (C) 2003 by Ismael Orenstein
+    email                : orenstein@kde.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 "xingheader.h"
+
+using namespace TagLib;
+
+class MPEG::XingHeader::XingHeaderPrivate
+{
+public:
+  XingHeaderPrivate() :
+    frames(0),
+    size(0),
+    valid(false)
+    {}
+
+  uint frames;
+  uint size;
+  bool valid;
+};
+
+MPEG::XingHeader::XingHeader(const ByteVector &data) 
+{
+  d = new XingHeaderPrivate;
+  parse(data);
+}
+
+MPEG::XingHeader::~XingHeader()
+{
+  delete d;
+}
+
+bool MPEG::XingHeader::isValid() const
+{
+  return d->valid;
+}
+
+TagLib::uint MPEG::XingHeader::totalFrames() const
+{
+  return d->frames;
+}
+
+TagLib::uint MPEG::XingHeader::totalSize() const
+{
+  return d->size;
+}
+
+int MPEG::XingHeader::xingHeaderOffset(TagLib::MPEG::Header::Version v,
+                                       TagLib::MPEG::Header::ChannelMode c)
+{
+  if(v == MPEG::Header::Version1) {
+    if(c == MPEG::Header::SingleChannel)
+      return 0x15;
+    else
+      return 0x24;
+  }
+  else {
+    if(c == MPEG::Header::SingleChannel)
+      return 0x0D;
+    else
+      return 0x15;
+  }
+}
+
+void MPEG::XingHeader::parse(const ByteVector &data)
+{
+  // Check to see if a valid Xing header is available.
+
+  if(data.mid(0, 4) != "Xing")
+    return;
+
+  // If the XingHeader doesn't contain the number of frames and the total stream
+  // info it's invalid.
+
+  if(!(data[7] & 0x02)) {
+    debug("MPEG::XingHeader::parse() -- Xing header doesn't contain the total number of frames.");
+    return;
+  }
+
+  if(!(data[7] & 0x04)) {
+    debug("MPEG::XingHeader::parse() -- Xing header doesn't contain the total stream size.");
+    return;
+  }
+
+  d->frames = data.mid(8, 4).toUInt();
+  d->size = data.mid(12, 4).toUInt();
+
+  d->valid = true;
+}