QSound interface with SDL_mixer implementation

QSound2.h

/**
 * @file   QSound2.h
 * @author Liangfu Chen <chenclf@gmail.com>
 * @date   Tue Jul 10 14:39:25 2012
 * 
 * @brief  QSound interface with SDL_mixer implementation
 *         
 *		   Phonon is not the default option while compile Qt4.
 *		   This class is designed to enable brief sound playback in
 *		   the Linux environment.
 *
 *		   Usage:
 *			   QSound2 m_sound("sound/music.wav");
 *             m_sound.play();
 *             if (!m_sound.isFinnished()){
 *                 m_sound.stop();
 *             }
 */

#ifndef __Q_SOUND2_H__
#define __Q_SOUND2_H__

#include <QThread>
#include <SDL/SDL.h>
#include <SDL/SDL_mixer.h>

class QSound2 : public QThread
{
	char m_soundfn[1024];

	// Pointer to our sound, in memory
	Mix_Chunk * m_sound;

	// Channel on which our sound is played
	int m_channel;

protected:
	void run(){
		// Wait until the sound has stopped playing
		if (Mix_Playing(m_channel) == 0){
			stop();
			return;
		}
		
		exec();
	}

public:
	QSound2(const char * fn):
		m_sound(NULL)
	{
		strcpy(m_soundfn, fn);
		
		int audio_rate = 22050;// Frequency of audio playback

		// Format of the audio we're playing
		Uint16 audio_format = AUDIO_S16SYS;

		int audio_channels = 2;//2 channels = stereo
		int audio_buffers = 4096;//Size of the audio buffers in memory

		// Initialize BOTH SDL video and SDL audio
		if (SDL_Init(SDL_INIT_AUDIO) != 0) {
			printf("Unable to initialize SDL: %s\n", SDL_GetError());
		}

		// Initialize SDL_mixer with our chosen audio settings
		if (Mix_OpenAudio(audio_rate, audio_format,
						  audio_channels, audio_buffers) != 0) {
			printf("Unable to initialize audio: %s\n", Mix_GetError());
		}

		// Load our WAV file from disk
		m_sound = Mix_LoadWAV(m_soundfn);
		if (m_sound == NULL) {
			printf("Unable to load WAV file: %s\n", Mix_GetError());
		}
	}

	void play(){
		// Play our sound file, and capture the channel on which it is played
		m_channel = Mix_PlayChannel(-1, m_sound, 0);
		if (m_channel == -1) {
			printf("Unable to play WAV file: %s\n", Mix_GetError());
		}
		start();
	}
	bool isPlaying() const {return isRunning();}
	bool isFinnished() const {return (!isRunning());}
	void stop(){
		Mix_HaltChannel(-1);
		quit();
	}

	~QSound2(){
		// Release the memory allocated to our sound
		Mix_FreeChunk(m_sound);

		// Need to make sure that SDL_mixer and SDL have a chance to clean up
		Mix_CloseAudio();
		SDL_Quit();
	}
};


#endif //__Q_SOUND2_H__