/**
?*?最簡單的DirectSound播放音頻的例子（DirectSound播放PCM）
?*?Simplest?Audio?Play?DirectSound?（DirectSound?play?PCM）?
?*
?*?雷霄驊?Lei?Xiaohua
?*?leixiaohua1020@126.com
?*?中國傳媒大學/數字電視技術
?*?Communication?University?of?China?/?Digital?TV?Technology
?*?http://blog.csdn.net/leixiaohua1020
?*
?*?本程序使用DirectSound播放PCM音頻采樣數據。
?*?是最簡單的DirectSound播放音頻的教程。
?*
?*?函數調用步驟如下：
?*
?*?[初始化]
?*?DirectSoundCreate8（）：創建一個DirectSound對象。
?*?SetCooperativeLevel（）：設置協作權限，不然沒有聲音。
?*?IDirectSound8->CreateSoundBuffer（）：創建一個主緩沖區對象。
?*?IDirectSoundBuffer->QueryInterface（IID_IDirectSoundBuffer8..）：
?*			創建一個副緩沖區對象，用來存儲要播放的聲音數據文件。
?*?IDirectSoundBuffer8->QueryInterface（IID_IDirectSoundNotify..）：
?*			創建通知對象，通知應用程序指定播放位置已經達到。
?*?IDirectSoundNotify8->SetNotificationPositions（）：設置通知位置。
?*?IDirectSoundBuffer8->SetCurrentPosition（）：設置播放的起始點。
?*?IDirectSoundBuffer8->Play（）：開始播放。
?*
?*?[循環播放數據]
?*?IDirectSoundBuffer8->Lock（）：鎖定副緩沖區，準備寫入數據。
?*?fread（）：讀取數據。
?*?IDirectSoundBuffer8->Unlock（）：解鎖副緩沖區。
?*?WaitForMultipleobjects（）：等待“播放位置已經達到”的通知。
?*
?*?This?software?plays?PCM?raw?audio?data?using?DirectSound.
?*?It‘s?the?simplest?tutorial?about?DirectSound.
?*
?*?The?process?is?shown?as?follows:
?*
?*?[Init]
?*?DirectSoundCreate8（）:?Init?DirectSound?object.
?*?SetCooperativeLevel（）:?Must?set?or?we?won‘t?hear?sound.
?*?IDirectSound8->CreateSoundBuffer（）:?Create?primary?sound?buffer.
?*?IDirectSoundBuffer->QueryInterface（IID_IDirectSoundBuffer8..）:?
?*			Create?secondary?sound?buffer.
?*?IDirectSoundBuffer8->QueryInterface（IID_IDirectSoundNotify..）:?
?*			Create?Notification?object.
?*?IDirectSoundNotify8->SetNotificationPositions（）:
?*			Set?Notification?Positions.
?*?IDirectSoundBuffer8->SetCurrentPosition（）:?Set?position?to?start.
?*?IDirectSoundBuffer8->Play（）:?Begin?to?play.
?*
?*?[Loop?to?play?data]
?*?IDirectSoundBuffer8->Lock（）:?Lock?secondary?buffer.
?*?fread（）:?get?PCM?data.
?*?IDirectSoundBuffer8->Unlock（）:?UnLock?secondary?buffer.
?*?WaitForMultipleobjects（）:?Wait?for?Notifications.
?*/
#include?
#include?
#include?
#include?


#define?MAX_AUDIO_BUF?4?
#define?BUFFERNOTIFYSIZE?192000?


int?sample_rate=44100;	//PCM?sample?rate
int?channels=2;			//PCM?channel?number
int?bits_per_sample=16;	//bits?per?sample

BOOL?main（int?argcchar?*?argv[]）
{
	int?i;
	FILE?*?fp;
	if（（fp=fopen（“../NocturneNo2inEflat_44.1k_s16le.pcm““rb“））==NULL）{
		printf（“cannot?open?this?file\n“）;
		return?-1;
	}

	IDirectSound8?*m_pDS=0;					
	IDirectSoundBuffer8?*m_pDSBuffer8=NULL;	//used?to?manage?sound?buffers.
	IDirectSoundBuffer?*m_pDSBuffer=NULL;	
	IDirectSoundNotify8?*m_pDSNotify=0;		
	DSBPOSITIONNOTIFY?m_pDSPosNotify[MAX_AUDIO_BUF];
	HANDLE?m_event[MAX_AUDIO_BUF];

	SetConsoletitle（TEXT（“Simplest?Audio?Play?DirectSound“））;//Console?title
	//Init?DirectSound
	if（FAILED（DirectSoundCreate8（NULL&m_pDSNULL）））
		return?FALSE;
	if（FAILED（m_pDS->SetCooperativeLevel（FindWindow（NULLTEXT（“Simpl