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a server-side copy/move. git-svn-id: svn://anonsvn.kde.org/home/kde/trunk/kdesupport/taglib@288617 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
2025-07-18 21:14:23 -04:00 · 2004-02-17 02:11:05 +00:00
commit 7fe6647435
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--- a/mpeg/xingheader.h
+++ b/mpeg/xingheader.h
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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                                                                   *
+ ***************************************************************************/
+
+#ifndef TAGLIB_XINGHEADER_H
+#define TAGLIB_XINGHEADER_H
+
+#include "mpegheader.h"
+
+namespace TagLib {
+
+  class ByteVector;
+
+  namespace MPEG {
+
+    //! An implementation of the Xing VBR headers
+
+    /*!
+     * This is a minimalistic implementation of the Xing VBR headers.  Xing
+     * headers are often added to VBR (variable bit rate) MP3 streams to make it
+     * easy to compute the length and quality of a VBR stream.  Our implementation
+     * is only concerned with the total size of the stream (so that we can
+     * calculate the total playing time and the average bitrate).  It uses
+     * <a href="http://home.pcisys.net/~melanson/codecs/mp3extensions.txt">this text</a>
+     * and the XMMS sources as references.
+     */
+
+    class XingHeader
+    {
+      public:
+        /*!
+	 * Parses a Xing header based on \a data.  The data must be at least 16
+	 * bytes long (anything longer than this is discarded).
+	 */
+        XingHeader(const ByteVector &data);
+
+        /*!
+         * Destroy this XingHeader instance.
+         */
+        virtual ~XingHeader();
+
+        /*!
+         * Returns true if the data was parsed properly and if there is a vaild
+	 * Xing header present.
+         */
+        bool isValid() const;
+
+        /*!
+         * Returns the total number of frames.
+         */
+        uint totalFrames() const;
+
+        /*!
+         * Returns the total size of stream in bytes.
+         */
+        uint totalSize() const;
+
+        /*!
+         * Returns the offset for the start of this Xing header, given the
+	 * version and channels of the frame
+         */
+        static int xingHeaderOffset(TagLib::MPEG::Header::Version v,
+                                    TagLib::MPEG::Header::ChannelMode c);
+
+      private:
+        void parse(const ByteVector &data);
+
+	class XingHeaderPrivate;
+	XingHeaderPrivate *d;
+    };
+  }
+}
+
+#endif