Initial community commit

Src/replicant/nsmp3dec/mpegbitstream.h

@@ -0,0 +1,71 @@
+/***************************************************************************\
+ *
+*                    MPEG Layer3-Audio Decoder
+*                  <20> 1997-2006 by Fraunhofer IIS
+ *                        All Rights Reserved
+ *
+ *   filename: mpegbitstream.h
+ *   project : MPEG Decoder
+ *   author  : Martin Sieler
+ *   date    : 1997-12-05
+ *   contents/description: MPEG bitstream - HEADER
+ *
+ *
+\***************************************************************************/
+
+/*
+ * $Date: 2010/11/17 20:46:04 $
+ * $Id: mpegbitstream.h,v 1.1 2010/11/17 20:46:04 audiodsp Exp $
+ */
+
+#ifndef __MPEGBITSTREAM_H__
+#define __MPEGBITSTREAM_H__
+
+/* ------------------------ includes --------------------------------------*/
+
+#include "bitstream.h"
+#include "mpegheader.h"
+#include "mp3sscdef.h"
+
+/*-------------------------- defines --------------------------------------*/
+
+/*-------------------------------------------------------------------------*/
+
+//
+// MPEG bitstream class.
+//
+//  This object is derived from CBitStream. In addition to CBitStream
+//  this object is able to sync to the next ISO/MPEG header position.
+//
+
+class CMpegBitStream : public CBitStream
+{
+public:
+  CMpegBitStream(int cbSize);
+  CMpegBitStream(unsigned char *pBuf, int cbSize, bool fDataValid = false);
+  virtual ~CMpegBitStream();
+
+  virtual void       Reset();
+
+  SSC                DoSync();
+  int                GetSyncPosition() const { return m_SyncPosition; }
+  const CMpegHeader *GetHdr() const { return &m_Hdr; }
+
+protected:
+
+private:
+
+  SSC DoSyncInitial();
+  SSC DoSyncContinue();
+
+  enum { FRAMES_TO_CHECK = 10 };
+
+  CMpegHeader   m_Hdr;            // mpeg header
+  unsigned long m_FirstHdr;       // "relevant" bits of first good header
+  unsigned long m_nFramesToCheck; // # frames to be checked for next mpeg header
+  int           m_SyncPosition;   // offset of first sync in bits
+  SSC           m_SyncState;      // last sync state
+};
+
+/*-------------------------------------------------------------------------*/
+#endif