audiomanager.cpp

游戏音频程序设计-Beginning.Game.Audio.Programming

// AudioManager.cpp: implementation of the CAudioManager class.
//
//////////////////////////////////////////////////////////////////////

#include "AudioManager.h"

namespace AudioEngine {

void CAudioManager::Init(HWND hwnd, bool stereo, int perfchannels)
{
  HRESULT hr;

  // initialize COM
  hr = CoInitialize(NULL);
  ThrowIfFailed(hr, "CAudioManager::Init: CoInitialize failed.");

  // Create the loader
  hr = CoCreateInstance(CLSID_DirectMusicLoader, NULL, CLSCTX_INPROC,
    IID_IDirectMusicLoader8, (void**)&m_Loader);
  ThrowIfFailed(hr, "CAudioManager::Init: CoCreateInstance for loader failed.");

  // Create performance object
  hr = CoCreateInstance( CLSID_DirectMusicPerformance, NULL, CLSCTX_INPROC, 
    IID_IDirectMusicPerformance8, (void**)&m_Performance);
  ThrowIfFailed(hr, "CAudioManager::Init: CoCreateInstance for performance failed.");

  hr = m_Performance->InitAudio(NULL, NULL, hwnd, stereo ? DMUS_APATH_DYNAMIC_STEREO : DMUS_APATH_DYNAMIC_MONO, 
    perfchannels, DMUS_AUDIOF_ALL, NULL);
  if (hr == DSERR_NODRIVER) {
    // output a warning message, then continue as usual
    MessageBox(hwnd, "The program could not locate your audio hardware.  Make sure your driver supports DirectX 8.", "Audio Engine", MB_ICONSTOP);
    return; // notice we didn't set m_InitGood true
  }
  else ThrowIfFailed(hr, "CAudioManager::Init: m_Performance->InitAudio failed.");

  m_InitGood = true;
}

void CAudioManager::UnInit()
{
  if(m_Performance != NULL) {
    m_Performance->Stop( NULL, NULL, 0, 0 );
    m_Performance->CloseDown();
    SAFE_RELEASE( m_Performance );
  }

  SAFE_RELEASE( m_Loader ); 
  m_InitGood = false;
}

CSoundPtr CAudioManager::LoadSound(const CWAVFile &wavfile)
{
  unsigned char *savedata = wavfile.Save();

  // when you load a wave from memory, DirectMusic owns the memory pointer...
  // do NOT delete!
  return(LoadSound(savedata, wavfile.GetTotalSize()));
}

CSoundPtr CAudioManager::LoadSound(unsigned char *data, int datalen)
{
  HRESULT hr;
	CSound *snd = new CSound(this);

  DMUS_OBJECTDESC desc;
  memset(&desc, 0, sizeof(DMUS_OBJECTDESC));

  desc.dwSize = sizeof(DMUS_OBJECTDESC);
  desc.dwValidData = DMUS_OBJ_MEMORY | DMUS_OBJ_CLASS;
  desc.guidClass = CLSID_DirectMusicSegment;
  desc.llMemLength = datalen;
  desc.pbMemData = data;

  hr = m_Loader->GetObject(&desc, IID_IDirectMusicSegment8, (void **)&snd->m_Segment);
  ThrowIfFailed(hr, "CAudioManager::LoadSound(unsigned char *data): GetObject failed.");

  snd->m_OriginalData = data;

  return(CSoundPtr(snd)); 
}

CSoundPtr CAudioManager::LoadSound(HMODULE hmod, WORD resID)
{
  CSound *snd = new CSound(this);

  HRESULT hr;
  DMUS_OBJECTDESC ObjDesc;
 
  HRSRC hFound = FindResource(hmod, MAKEINTRESOURCE(resID), RT_RCDATA);
  HGLOBAL hRes = LoadResource(hmod, hFound);
 
  ObjDesc.dwSize = sizeof(DMUS_OBJECTDESC);
  ObjDesc.guidClass = CLSID_DirectMusicSegment;
  ObjDesc.dwValidData = DMUS_OBJ_CLASS | DMUS_OBJ_MEMORY;
  ObjDesc.pbMemData = (BYTE *) LockResource(hRes);
  ObjDesc.llMemLength = SizeofResource(hmod, hFound);
 
  hr = m_Loader->GetObject(&ObjDesc, IID_IDirectMusicSegment8, 
    (void**) &snd->m_Segment);

  ThrowIfFailed(hr, "CAudioManager::LoadSound(HMODULE hmod, WORD resID): GetObject failed.");
  return(CSoundPtr(snd));
}

CSoundPtr CAudioManager::LoadSound(std::string filename)
{
  HRESULT hr;
	CSound *snd = new CSound(this);

  // convert filename to wide-string
  WCHAR widefilename[MAX_PATH];
  DXUtil_ConvertGenericStringToWideCch( widefilename, filename.c_str(), MAX_PATH);

  // tell loader to load this file
  hr = m_Loader->LoadObjectFromFile(
    CLSID_DirectMusicSegment,
    IID_IDirectMusicSegment8,
    widefilename,
    (void**) &snd->m_Segment);
  ThrowIfFailed(hr, "CAudioManager::LoadSound(std::string filename): LoadObjectFromFile failed.");

	return(CSoundPtr(snd)); 

}

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CAudioManager::CAudioManager()
{
  m_InitGood = false;
  m_Performance = NULL;
  m_Loader = NULL;
}

CAudioManager::~CAudioManager()
{

}

}; // namespace