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(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: LoadObjectFromFile failed.");

	return(CSoundPtr(snd)); 

}

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

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

CAudioManager::~CAudioManager()
{

}

}; // namespace