www.pudn.com > GameEngine.rar > GameEngine_Sound.cpp, change:2005-10-19,size:5954b

#include "..\GameEngine_Common.h" 
#include "GameEngine_Sound.h" 
 
/******************************************************/ 
/*******CGameEngine_SoundManager类的函数实现代码*******/ 
/******************************************************/ 
 
//先初始化m_pSoundManager,否则会产生链接错误 
CGameEngine_SoundManager* CGameEngine_SoundManager::m_pSoundManager=NULL; 
 
CGameEngine_SoundManager::CGameEngine_SoundManager(){ 
	m_pSoundManager=this;  //构造函数初始化 
	m_pDirectSound=NULL; 
} 
 
CGameEngine_SoundManager::~CGameEngine_SoundManager(){ 
	SafeRelease(m_pDirectSound); 
} 
//初始化管理器 
bool CGameEngine_SoundManager::Init(HWND hWnd,DWORD dwCoopLevel){ 
	//创建IDirectSound对象 
	if(FAILED(DirectSoundCreate8(NULL,&m_pDirectSound,NULL))) 
		return false; 
	//设置协调级别(DSSCL_NORMAL会自动设置一个主缓冲区) 
	if(FAILED(m_pDirectSound->SetCooperativeLevel(hWnd,dwCoopLevel))) 
		return false; 
	return true; 
} 
//设置主缓冲区格式 
bool CGameEngine_SoundManager::SetPrimaryBufferFormat( 
										WORD wChannels, 
										DWORD dwSamplesPerSec, 
										WORD wBitsPerSample){ 
    if(m_pDirectSound==NULL) 
        return false; 
    //填写主缓冲区的描述结构体 
    DSBUFFERDESC bufferDesc; 
    ZeroMemory(&bufferDesc,sizeof(DSBUFFERDESC)); 
    bufferDesc.dwSize=sizeof(DSBUFFERDESC); 
    bufferDesc.dwFlags=DSBCAPS_PRIMARYBUFFER;  //表示主缓冲区 
    bufferDesc.dwBufferBytes=0;  //主缓冲区必须设置为0 
    bufferDesc.lpwfxFormat=NULL; //主缓冲区必须设置为NULL 
    //取得主缓冲区 
	IDirectSoundBuffer* pDirectSoundBuf=NULL; 
    if(FAILED(m_pDirectSound->CreateSoundBuffer(&bufferDesc,&pDirectSoundBuf,NULL))) 
        return false; 
	//设置主缓冲区的自定义格式 
    WAVEFORMATEX waveFormat; 
    ZeroMemory(&waveFormat,sizeof(WAVEFORMATEX));  
    waveFormat.wFormatTag=WAVE_FORMAT_PCM;  
    waveFormat.nChannels=wChannels;  
    waveFormat.nSamplesPerSec=dwSamplesPerSec;  
    waveFormat.wBitsPerSample=wBitsPerSample;  
    waveFormat.nBlockAlign=(waveFormat.wBitsPerSample / 8) * waveFormat.nChannels; 
    waveFormat.nAvgBytesPerSec=waveFormat.nSamplesPerSec * waveFormat.nBlockAlign; 
    if(FAILED(pDirectSoundBuf->SetFormat(&waveFormat))) 
        return false; 
	//释放主缓冲区接口对象(已在声卡内存分配好主缓冲区) 
    SafeRelease(pDirectSoundBuf); 
    return true; 
} 
 
/**************************************************/ 
/********CGameEngine_Sound类的函数实现代码*********/ 
/**************************************************/ 
 
CGameEngine_Sound::CGameEngine_Sound(){ 
 
} 
 
CGameEngine_Sound::~CGameEngine_Sound(){ 
	SafeRelease(m_pDirectSoundBuf8); 
} 
 
bool CGameEngine_Sound::LoadWaveFile(TCHAR* szWaveFile){ 
	//打开Wave文件	 
	FILE *fp; 
	if((fp=fopen(szWaveFile,"rb"))==NULL) 
		return false; 
	//取得次缓冲区 
	if(!GetSecondaryBuffer(fp)){ 
		fclose(fp);  //关闭Wave文件 
		return false; 
	} 
	//读入Wave声音数据 
	if(!LoadDataInBuffer(fp)){ 
		fclose(fp); 
		return false; 
	} 
	//关闭文件 
	fclose(fp); 
	return true; 
} 
 
bool CGameEngine_Sound::GetSecondaryBuffer(FILE *fp){ 
	//读文件头的Wav格式 
	sWaveHeader* pWaveHeader=new sWaveHeader(); 
	fseek(fp,0,SEEK_SET); 
	fread(pWaveHeader,1,sizeof(sWaveHeader),fp); 
	//检查是否为Wav文件 
	if(memcmp(pWaveHeader->RiffID, "RIFF", 4) ||  
	   memcmp(pWaveHeader->WaveID, "WAVE", 4) || 
       memcmp(pWaveHeader->FormatID, "fmt ", 4) || 
       memcmp(pWaveHeader->DataID, "data",4)) 
	   return false; 
	//设置声音格式 
	WAVEFORMATEX waveFormat; 
	ZeroMemory(&waveFormat,sizeof(WAVEFORMATEX)); 
	waveFormat.wFormatTag=WAVE_FORMAT_PCM; 
	waveFormat.nChannels=pWaveHeader->Channels;  //声道数 
	waveFormat.nSamplesPerSec=pWaveHeader->SampleRate;  //播放频率 
	waveFormat.wBitsPerSample=pWaveHeader->BitsPerSample;  //位数 
	waveFormat.nBlockAlign=(waveFormat.wBitsPerSample / 8) * waveFormat.nChannels; 
	waveFormat.nAvgBytesPerSec=waveFormat.nSamplesPerSec * waveFormat.nBlockAlign; 
	//填写缓冲区描述结构体(音量可控制、声音文件大小和声音格式) 
	DSBUFFERDESC bufferDesc; 
	ZeroMemory(&bufferDesc,sizeof(DSBUFFERDESC)); 
	bufferDesc.dwSize=sizeof(DSBUFFERDESC); 
	bufferDesc.dwFlags=DSBCAPS_CTRLVOLUME|DSBCAPS_GLOBALFOCUS|DSBCAPS_STATIC; 
	bufferDesc.dwBufferBytes=pWaveHeader->DataSize; 
	bufferDesc.lpwfxFormat=&waveFormat; 
	//先取得IDirectSoundBuffer缓冲区接口对象 
	IDirectSoundBuffer* pDirectSoundBuf=NULL; 
	if(FAILED(CGameEngine_SoundManager::GetSoundManager()->GetDirectSound()->CreateSoundBuffer(&bufferDesc,&pDirectSoundBuf,NULL))) 
		return false; 
	//再取得IDirectSoundBuffer8缓冲区接口对象 
	if(FAILED(pDirectSoundBuf->QueryInterface(IID_IDirectSoundBuffer8,  
                   (void**)&m_pDirectSoundBuf8))){ 
		pDirectSoundBuf->Release(); 
		return false; 
	} 
	delete pWaveHeader; 
	return true; 
} 
 
bool CGameEngine_Sound::LoadDataInBuffer(FILE* fp){ 
	//读Wave文件大小 
	sWaveHeader* pWaveHeader=new sWaveHeader(); 
	fseek(fp,0,SEEK_SET); 
	fread(pWaveHeader,1,sizeof(sWaveHeader),fp); 
	//锁定缓冲区 
	BYTE *pSoundPtr1=NULL; 
	BYTE *pSoundPtr2=NULL; 
	DWORD dwSoundSize1,dwSoundSize2; 
	if(FAILED(m_pDirectSoundBuf8->Lock(0,pWaveHeader->DataSize, 
						   (void**)&pSoundPtr1, &dwSoundSize1, 
                           (void**)&pSoundPtr2, &dwSoundSize2,0))) 
		return false; 
	//读数据到缓冲区 
	fread(pSoundPtr1,1,dwSoundSize1,fp); 
	if(pSoundPtr2 != NULL) 
		fread(pSoundPtr2,1,dwSoundSize2,fp); 
	//解锁 
	m_pDirectSoundBuf8->Unlock(pSoundPtr1,dwSoundSize1,pSoundPtr2,dwSoundSize2); 
	delete pWaveHeader; 
	return true; 
} 
 
bool CGameEngine_Sound::Play(bool bLoop){ 
	if(m_pDirectSoundBuf8==NULL) 
		return false; 
	m_pDirectSoundBuf8->SetCurrentPosition(0); 
	if(FAILED(m_pDirectSoundBuf8->Play(0,0,bLoop?true:false))) 
		return false; 
	return true; 
} 
 
bool CGameEngine_Sound::SetVolume(long lVolume){ 
	if(FAILED(m_pDirectSoundBuf8->SetVolume(lVolume))) 
		return false; 
	return true; 
} 
 
bool CGameEngine_Sound::Stop(){ 
	if(FAILED(m_pDirectSoundBuf8->Stop())) 
		return false; 
	return true; 
}