MpAudioUtils.h

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//  
// Copyright (C) 2006 SIPez LLC. 
// Licensed to SIPfoundry under a Contributor Agreement. 
//
// Copyright (C) 2004-2006 SIPfoundry Inc.
// Licensed by SIPfoundry under the LGPL license.
//
// Copyright (C) 2004-2006 Pingtel Corp.  All rights reserved.
// Licensed to SIPfoundry under a Contributor Agreement.
//
// $$

// SYSTEM INCLUDES

// APPLICATION INCLUDES
#include <os/OsDefs.h>
#include <os/OsStatus.h>
#include <utl/UtlString.h>
#include "mp/MpTypes.h"

void ConvertUnsigned8ToSigned16(unsigned char *in_buffer, MpAudioSample *out_buffer, int numBytesToConvert);

int gcd(int a, int b);
int reSample(char * charBuffer, int numBytes, int currentSampleRate, int newSampleRate);

int mergeChannels(char * charBuffer, int Size, int nTotalChannels);
#ifndef DISABLE_STREAM_PLAYER

OsStatus mergeWaveUrls(UtlString rSourceUrls[], UtlString &rDestFile);

OsStatus mergeWaveFiles(UtlString rSourceFiles[], UtlString &rDestFile);

#endif  // DISABLE_STREAM_PLAYER

//routines for compressing & decompressing aLaw and uLaw
void InitG711Tables();
size_t DecompressG711MuLaw(MpAudioSample *buffer,size_t length);
size_t DecompressG711ALaw(MpAudioSample *buffer, size_t length);
unsigned char ALawEncode2(MpAudioSample s);
unsigned char MuLawEncode2(MpAudioSample s);
MpAudioSample MuLawDecode2(unsigned char ulaw);
MpAudioSample ALawDecode2(unsigned char alaw);