[转帖]用DirectSound播放OGG格式的音乐

鼯鼠

应shenqiren朋友的要求，我贴一段我自己播放OGG音乐的代码。
我的代码没经过仔细的设计，写的也很随意，希望大家帮我修正一下。
（写的时候参考了粘土游戏库的代码）。

头文件:

#include <dsound.h> #include <assert.h> #include <math.h> #include <ogg/ogg.h> #include <vorbis/codec.h> #include <vorbis/vorbisfile.h> #include <mmsystem.h> #pragma comment(lib,"dsound.lib") #pragma comment(lib,"dxguid.lib") #pragma comment(lib,"winmm.lib") class ljmMusicBuffer_DSound : public ljmMusicBuffer { public:  ljmMusicBuffer_DSound(IDirectSound8* pDS);  ~ljmMusicBuffer_DSound();  bool LoadOggFile(const char* szFileName);  void Play(bool bLoop);  void Stop(void);  void Pause(void);  void Reset(void);  void SetVolume(float vol);  bool IsPlaying(void); protected:  LPDIRECTSOUND8        m_pDS;  LPDIRECTSOUNDBUFFER    m_pBuffer;  LONG                   m_lVolume;  WAVEFORMATEX           m_wfx;  DWORD                  m_dwWritePos;  OggVorbis_File* m_pVorbisFile;  string m_strCurFile;  bool m_bMono ;  long m_lRate;  int  current_section;  bool m_bLoop;  bool m_bFinished; // static const int BUFFERSIZE = 8192;  UINT m_TimerID;  void Clear(void);  void FillBuffer(void);  static void CALLBACK OnTimerCB(UINT uID, UINT uMsg,DWORD_PTR pUserData, DWORD_PTR dwParam1, DWORD_PTR dwParam2); };

函数体

ljmMusicBuffer_DSound::ljmMusicBuffer_DSound(IDirectSound8* pDS) :m_pDS(pDS) ,m_pBuffer(NULL) ,m_TimerID(0) ,m_pVorbisFile(NULL) ,m_bLoop(false) ,m_bFinished(false) { } ljmMusicBuffer_DSound::~ljmMusicBuffer_DSound() {  Stop();  Clear(); } void ljmMusicBuffer_DSound:lay(bool bLoop) {  if(!m_pBuffer)   return;  m_bLoop = bLoop;  if(IsPlaying())   Stop();  m_dwWritePos = 0;  FillBuffer();  FillBuffer();  m_pBuffer->lay(0,0,DSBPLAY_LOOPING);  m_bFinished = false;  m_TimerID = timeSetEvent(500,0,OnTimerCB,(DWORD_PTR)this,TIME_PERIODIC); } void ljmMusicBuffer_DSound::Stop(void) {  timeKillEvent(m_TimerID);  Reset();  m_bFinished = true; } void ljmMusicBuffer_DSound:ause(void) {  m_pBuffer->Stop(); } void ljmMusicBuffer_DSound::Reset(void) {  if(!m_pBuffer)   return;  m_pBuffer->Stop();  m_pBuffer->SetCurrentPosition(0);  m_dwWritePos = 0;  if(m_pVorbisFile)   ov_pcm_seek(m_pVorbisFile,0); } void ljmMusicBuffer_DSound::SetVolume(float vol) {  //vol 为 0.0f~1.0f , DSound的单位是分贝  if (vol > 0)  {   m_lVolume = (LONG)(log10(vol) * 2000.0f);  }  else  {   m_lVolume = -10000;  }  if(!m_pBuffer)   return;  m_pBuffer->SetVolume((LONG)vol); } bool ljmMusicBuffer_DSound::IsPlaying(void) {  DWORD dwStatus;  if(!m_pBuffer)   return false;  m_pBuffer->GetStatus(&dwStatus);  return (dwStatus & DSBSTATUS_PLAYING); } void ljmMusicBuffer_DSound::Clear(void) {  SAFE_RELEASE(m_pBuffer);  if(m_pVorbisFile)  {   ov_clear(m_pVorbisFile);   delete m_pVorbisFile;   m_pVorbisFile = NULL;  } }

bool ljmMusicBuffer_DSound:oadOggFile(const char* szFileName)
{
 Stop();
 Clear();
 if(m_strCurFile == szFileName)
  return true;

 FILE* pFile = fopen(szFileName,"rb");
 if(!pFile)
  return false;

 if(m_pVorbisFile)
 {
  ov_clear(m_pVorbisFile);
  delete m_pVorbisFile;
 }
 m_pVorbisFile = new OggVorbis_File;
 memset(m_pVorbisFile,0,sizeof(OggVorbis_File));
 ov_clear(m_pVorbisFile);

 if( 0!=ov_open(pFile,m_pVorbisFile,NULL,0) )
 {
  ov_clear(m_pVorbisFile);
  delete m_pVorbisFile;
  return false;
 }

 if(m_pVorbisFile->vi->channels == 1)
 {
  m_bMono = true;
 }
 else
 {
  m_bMono = false;
 }

 m_lRate = m_pVorbisFile->vi->rate;

// WAVEFORMATEX wfx;

 m_wfx.wFormatTag     = WAVE_FORMAT_PCM;
 m_wfx.nSamplesPerSec = (DWORD)m_lRate;
 m_wfx.wBitsPerSample = 16;
 m_wfx.cbSize   = sizeof(WAVEFORMATEX);
 
 if(m_bMono)
 {
  m_wfx.nChannels = 1;
 }
 else
 {
  m_wfx.nChannels = 2;
 }

 m_wfx.nBlockAlign  = m_wfx.nChannels * m_wfx.wBitsPerSample / 8;
 m_wfx.nAvgBytesPerSec = m_wfx.nSamplesPerSec * m_wfx.nBlockAlign;

 DSBUFFERDESC dsbd;
 ZeroMemory(&dsbd,sizeof(DSBUFFERDESC));
 dsbd.dwSize          = sizeof(dsbd);
 dsbd.dwFlags         = 0;//DSBCAPS_CTRLVOLUME;
 dsbd.dwBufferBytes   = m_wfx.nAvgBytesPerSec * 2; dsbd.guid3DAlgorithm = GUID_NULL;
 dsbd.lpwfxFormat     = &m_wfx;

 HRESULT hr;
 if(FAILED( hr = m_pDS->CreateSoundBuffer(&dsbd,&m_pBuffer,NULL)))
 {
  ov_clear(m_pVorbisFile);
  delete m_pVorbisFile;
  return false;
 }

 return true;
}

void ljmMusicBuffer_DSound::FillBuffer(void)
{

HRESULT hr;
VOID*   pDSLockedBuffer      = NULL; // Pointer to locked buffer memory
DWORD   dwDSLockedBufferSize = 0;    // Size of the locked DirectSound buffer
DWORD   dwWavDataRead        = 0;    // Amount of data read from the wav file

LPDIRECTSOUNDBUFFER pDSB = m_pBuffer;
BOOL bRepeatWavIfBufferLarger = FALSE;

if( pDSB == NULL )
return ;

// Make sure we have focus, and we didn't just switch in from
// an app which had a DirectSound device
//if( FAILED( hr = RestoreBuffer( pDSB, NULL ) ) )
// return hr;

// int  buffer_size;
long bytes_read;

size_t length = m_wfx.nAvgBytesPerSec / 2;

char* buffer = new char[length];

long leave = (long)length;
long cur_pos = 0;

do
{
bytes_read = ov_read(m_pVorbisFile,
                                                        buffer+cur_pos,
                                                        (int)leave,0/*endian*/,
                                                        2/*16-bit*/,1/*signed*/,
                                                        &current_section);
leave   -= bytes_read;
cur_pos += bytes_read;
if(bytes_read<=0)
break;
}while(leave>0);

bytes_read = cur_pos;

DWORD dwOffset = (DWORD)length * m_dwWritePos;

// Lock the buffer down
if( FAILED( hr = pDSB->Lock( dwOffset , (DWORD)length,
&pDSLockedBuffer, &dwDSLockedBufferSize,
NULL, NULL, 0L ) ) )
{
delete buffer;
return ;
}

memcpy(pDSLockedBuffer,buffer,(size_t)bytes_read);
if((size_t)bytes_read<length)
{
memset((char*)pDSLockedBuffer + bytes_read,0,
                                                               length-(size_t)bytes_read);
if(m_bLoop)
{
ov_pcm_seek(m_pVorbisFile,0);
}
else
{
m_bFinished = true;
}
}

m_dwWritePos++;
m_dwWritePos %= 4;

// Unlock the buffer, we don't need it anymore.
pDSB->Unlock( pDSLockedBuffer, dwDSLockedBufferSize, NULL, 0 );

delete buffer;

}

void CALLBACK ljmMusicBuffer_DSound::OnTimerCB(                                 UINT uID, UINT uMsg,                                 DWORD_PTR pUserData,                  DWORD_PTR dwParam1,                                 DWORD_PTR dwParam2) {  ljmMusicBuffer_DSound* pObj = (ljmMusicBuffer_DSound*)pUserData;  if(pObj)  {   if(pObj->m_bFinished)   {    pObj->Stop();   }   else   {    pObj->FillBuffer();   }  } }

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