GEAudioBuffer.h Example File

 /****************************************************************************
 **
 ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the QtDeclarative module of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #ifndef __GE_IGA_AUDIOBUFFER__
 #define __GE_IGA_AUDIOBUFFER__

 #include <QFile>
 #include "GEInterfaces.h"

 namespace GE {

     class CAudioBufferPlayInstance;
     class CAudioBuffer;         // forward declaration
     typedef AUDIO_SAMPLE_TYPE(*SAMPLE_FUNCTION_TYPE)(CAudioBuffer *abuffer, int pos, int channel);

     class CAudioBuffer {            // container for a sound
     public:
         CAudioBuffer();
         virtual ~CAudioBuffer();

         static CAudioBuffer* loadWav( QString fileName );
         static CAudioBuffer* loadWav( FILE *wavFile );          // support for stdio
         void reallocate( int length );

         inline void* getRawData() { return m_data; }
         inline int getDataLength() { return m_dataLength; }

         inline int getBytesPerSample() { return (m_bitsPerSample>>3); }
         inline int getBitsPerSample() { return m_bitsPerSample; }
         inline int getSamplesPerSec() { return m_samplesPerSec; }
         inline short getNofChannels() { return m_nofChannels; }
         inline SAMPLE_FUNCTION_TYPE getSampleFunction() { return m_sampleFunction; }

         // static implementations of sample functions
         static AUDIO_SAMPLE_TYPE sampleFunction8bitMono( CAudioBuffer *abuffer, int pos, int channel );
         static AUDIO_SAMPLE_TYPE sampleFunction16bitMono( CAudioBuffer *abuffer, int pos, int channel );
         static AUDIO_SAMPLE_TYPE sampleFunction8bitStereo( CAudioBuffer *abuffer, int pos, int channel );
         static AUDIO_SAMPLE_TYPE sampleFunction16bitStereo( CAudioBuffer *abuffer, int pos, int channel );

         CAudioBufferPlayInstance *playWithMixer( GE::CAudioMixer &mixer );

     protected:
         SAMPLE_FUNCTION_TYPE m_sampleFunction;
         short m_nofChannels;
         void *m_data;
         int m_dataLength;                // in bytes
         short m_bitsPerSample;
         bool m_signedData;
         int m_samplesPerSec;
     };

     class CAudioBufferPlayInstance : public IAudioSource {
     public:
         CAudioBufferPlayInstance();
         CAudioBufferPlayInstance( CAudioBuffer *start_playing );
         virtual ~CAudioBufferPlayInstance();
         void playBuffer( CAudioBuffer *startPlaying, float volume, float fixedSpeed, int loopTimes = 0 );            // looptimes -1 = loop forever

         void setSpeed( float speed );
         void setLeftVolume( float lvol );
         void setRightVolume( float rvol );

         inline void setLoopTimes( int ltimes ) { m_loopTimes = ltimes; }
         void stop();

         int pullAudio( AUDIO_SAMPLE_TYPE *target, int bufferLength );
         bool canBeDestroyed();

         bool isPlaying() { if (m_buffer) return true; else return false; }
         inline bool isFinished() { return m_finished; }
         inline bool destroyWhenFinished() { return m_destroyWhenFinished; }
         inline void setDestroyWhenFinished( bool set ) { m_destroyWhenFinished = set; }

     protected:
         int mixBlock( AUDIO_SAMPLE_TYPE *target, int bufferLength );
         bool m_finished;
         bool m_destroyWhenFinished;
         int m_fixedPos;
         int m_fixedInc;

         int m_fixedLeftVolume;
         int m_fixedRightVolume;
         int m_fixedCenter;
         int m_loopTimes;
         CAudioBuffer *m_buffer;
     };

 };

 #endif