audioplayerengine.h

一个视频播放器的源代码！供新手学习！功能很简单

#ifndef __AUDIOPLAYERENGINE_H__
#define __AUDIOPLAYERENGINE_H__

#include <MdaAudioTonePlayer.h>
#include <MdaAudioSamplePlayer.h>
#include <MdaAudioOutputStream.h>
#include <mda\common\audio.h>


class MAudioPlayerEngineObserver
	{
	public:
		virtual void HandlePlayingStoppedL() = 0;
	};

// CLASS DECLARATION

/**
 *
 * @class	AudioPlayerEngine AudioPlayerEngine.h
 * @brief	The engine plays the following
 * ->	a tone
 * ->	a wav file
 * ->	a midi file
 * ->	a stream, continuously, until stopped
 *
 * Copyright (c) EMCC Software Ltd 2003
 * @version	1.0
 *
 */
class CAudioPlayerEngine :	public CBase,
							public MMdaAudioToneObserver,
							public MMdaAudioPlayerCallback,
							public MMdaAudioOutputStreamCallback
	{
	public:
		enum TState	{ EStopped, EPlaying };

	public:
		static CAudioPlayerEngine* NewL(MAudioPlayerEngineObserver& aObserver);
		~CAudioPlayerEngine();

	public:				// MMdaAudioToneObserver
		virtual void MatoPrepareComplete(TInt aError);
		virtual void MatoPlayComplete(TInt aError);

	public:				// MMdaAudioPlayerCallback
		virtual void MapcInitComplete(TInt aError, const TTimeIntervalMicroSeconds& aDuration);
		virtual void MapcPlayComplete(TInt aError);

	public:				// MMdaAudioOutputStreamCallback
		virtual void MaoscOpenComplete(TInt aError);
		virtual void MaoscBufferCopied(TInt aError, const TDesC8& aBuffer);
		virtual void MaoscPlayComplete(TInt aError);

	public:
		void PlayToneL();
		void PlayWavL();
		void PlayMidiL();
		void PlayStreamL();
		void Stop();

	public:
		inline const TState& State() const;

	private:
		CAudioPlayerEngine(MAudioPlayerEngineObserver& aObserver);
		void ConstructL();

	private:
		MAudioPlayerEngineObserver& iObserver;
		CMdaAudioPlayerUtility*		iPlayerFile;
		CMdaAudioToneUtility*		iPlayerTone;
		CMdaAudioOutputStream*		iPlayerStream;
		TMdaAudioDataSettings		iStreamSettings;
		TUint8*						iStreamData;
		TPtr8*						iStreamBuffer;

		TState			iState;
	};

// inline functions
const CAudioPlayerEngine::TState& CAudioPlayerEngine::State() const		{ return iState; }

#endif