www.pudn.com > SoundMixer_Example_v1_0.zip > CSndMixer.h

   /* 
    * 
============================================================================ 
    *  Name     : CSndMixer.h 
    *  Part of  : SoundMixer 
    *  Created  : 03/01/2003 by Forum Nokia 
    *  Description: 
    *     This is the project specification file for SoundMixer. 
    * 
    *  Version  : 1.0.0 
    *  Copyright: Forum Nokia 
    * 
============================================================================ 
    */ 
 
 
#ifndef __CSNDMIXER_H__ 
#define __CSNDMIXER_H__ 
 
// INCLUDES 
#include  
#include "TSample.h" 
#include "TAudioShared.h" 
 
// CLASS DECLARATION 
 
/** 
*	CSndMixer is the main class for user to produce sound. 
*	this class creates second thread where the main mixer resides. 
*	Messages to the second thread are sent via exceptions. 
* 
*	Usage example: 
*	CSndMixer* iMixer; 
*	.. 
*	iMixer = CSndMixer->NewL(); 
*	// plays sample iSample in channel 0 with frequency 16000Hz 
*	// and volume 300 
*	iMixer->Play( iSample, 0, 16000, 300 ); 
* 
*/ 
class CSndMixer 
	: public CBase 
	{ 
	public: 
 
		/// Two-phased constructor 
		static CSndMixer* NewL(); 
 
		/// Default destructor 
		~CSndMixer(); 
 
	private: 
 
		/// Default constructor 
		CSndMixer(); 
 
		/// Second phase constructor 
		void ConstructL(); 
 
	public: 
 
		/// Pauses mixer 
		void Pause(); 
 
		/// Resumes mixer 
		void Resume(); 
 
		/// Plays a sample with given parameters 
		/// @param aSample sample to play 
		/// @param aChannel channel 0-15 to play the sample on 
		/// @param aVolume volume to play sample with, default is 256 
		void Play( const TSample& aSample, TInt aChannel, TInt aFrequency, TInt aVolume = 256 ); 
 
		/// Stops sample from playing in given channel 
		/// @param aChannel channel to play sample in 
		void Stop( TInt aChannel ); 
 
		/// Sets the main volume 
		/// @param aVolume new main volume 
		void SetVolume( TInt aVolume ); 
 
		/// returns main volume 
		/// @return main volume 
		TInt Volume(); 
 
	private: 
 
		void SendCmd( TMixerCmd aCmd ); 
 
	private: 
 
		TAudioShared	iShared;		// shared data with mixer thread 
		RThread			iMixerThread;	// handle to mixer thread 
 
		TSample			iEmptySample;	// empty sample, used to stop channel 
 
		TBool			iPaused;        // paused flag 
 
	}; 
 
 
 
#endif