Initial community commit

Src/replicant/nsmp3dec/mpegheader.h

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+/***************************************************************************\
+ *
+*                    MPEG Layer3-Audio Decoder
+*                  <20> 1997-2006 by Fraunhofer IIS
+ *                        All Rights Reserved
+ *
+ *   filename: mpegheader.h
+ *   project : MPEG Decoder
+ *   author  : Martin Sieler
+ *   date    : 1997-12-05
+ *   contents/description: ISO/MPEG Header
+ *
+ *
+\***************************************************************************/
+
+/*
+ * $Date: 2010/11/17 20:46:04 $
+ * $Id: mpegheader.h,v 1.1 2010/11/17 20:46:04 audiodsp Exp $
+ */
+
+#ifndef __MPEGHEADER_H__
+#define __MPEGHEADER_H__
+
+/* ------------------------ includes --------------------------------------*/
+
+/*-------------------------- defines --------------------------------------*/
+
+class CBitStream;
+
+/*-------------------------------------------------------------------------*/
+
+//
+// MPEG header class.
+//
+//  This object reads and decodes an ISO/MPEG header.
+//
+
+class CMpegHeader
+{
+public:
+  CMpegHeader();
+  virtual ~CMpegHeader();
+
+  int ReadFrom(CBitStream &sBS);
+  int FromInt(unsigned long dwHdrBits);
+
+  int   GetMpegVersion()     const { return m_MpegVersion;}
+  int   GetLayer()           const { return m_Layer;}
+  int   GetChannels()        const { return m_Channels;}
+  int   GetSampleRate()      const { return m_SampleRate;}
+  int   GetSampleRateNdx()   const { return m_SampleRateNdx;}
+  int   GetBitrate()         const { return m_Bitrate;}
+  int   GetBitrateNdx()      const { return m_BitrateNdx;}
+  int   GetMode()            const { return m_Mode;}
+  int   GetModeExt()         const { return m_ModeExt;}
+  int   GetPadding()         const { return m_Padding; }
+  int   GetCrcCheck()        const { return m_CrcCheck;}
+  int   GetCopyright()       const { return m_Copyright;}
+  int   GetOriginal()        const { return m_Original;}
+  int   GetEmphasis()        const { return m_Emphasis;}
+
+  int   GetHeaderLen()       const
+    { return MPEG_HDRLEN+(m_CrcCheck?MPEG_CRCLEN:0); }
+  int   GetFrameLen()        const { return m_FrameLen;}
+  float GetDuration()        const { return m_Duration;}
+  int   GetSamplesPerFrame() const;
+
+protected:
+
+private:
+
+  enum { MPEG_HDRLEN = 32, MPEG_CRCLEN = 16 };
+
+  int  CalcFrameLen();
+  void ResetMembers();
+  void SetMembers();
+
+  // header fields
+  int m_Syncword;
+  int m_Idex;
+  int m_Id;
+  int m_Layer;
+  int m_CrcCheck;
+  int m_BitrateNdx;
+  int m_SampleRateNdx;
+  int m_Padding;
+  int m_Private;
+  int m_Mode;
+  int m_ModeExt;
+  int m_Copyright;
+  int m_Original;
+  int m_Emphasis;
+
+  // calculated data
+  int   m_HeaderValid;
+  int   m_MpegVersion;
+  int   m_Channels;
+  int   m_SampleRate;
+  int   m_Bitrate;
+  int   m_FrameLen;
+  float m_Duration;
+};
+
+/*-------------------------------------------------------------------------*/
+#endif