ch6p1_midiplayback.cpp

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

// Ch6p1_MIDIPlayback.cpp : Defines the entry point for the console application.
//

#include <iostream>
#include <sstream>
#include <string>
#include <math.h>
#include <conio.h>
#include <windows.h>
#include <mmreg.h>

#include "dsound.h"
#include "dxerr8.h"
#include "AudioEngine/dxutil.h"
#include "AudioEngine/AudioEngine.h"

using namespace std;
using namespace AudioEngine;

CAudioManager g_AudioMgr;
CAudioManager *AudioEngine::GetAudioManager() { return(&g_AudioMgr); }

class CCh6p1StupidNotificationHandler : public CNotificationHandler
{
  virtual void OnBeat(DMUS_NOTIFICATION_PMSG &msg) { cout << "..Beat!.."; }
  virtual void OnMeasure(DMUS_NOTIFICATION_PMSG &msg) { cout << endl << "Measure!.."; }
};

void Exit(int errorcode)
{
  #ifdef _DEBUG
  cout << endl << endl << "(Program ended, press a key to exit.)";
  // so that the console window doesn't disappear before we have
  // a chance to look at it.
  getch(); 
#endif

  exit(errorcode);
}

HWND GetConsoleWindowHandle()
{
  char title[512];
  HWND hWnd;
 
  GetConsoleTitle(title, sizeof(title));
  hWnd = FindWindow(NULL, title);
  return(hWnd);
}

void main(int argc, char* argv[])
{
  
  try {

    // initialize audio manager
    cout << "Initializing Audio Manager..." << endl;
    g_AudioMgr.Init(GetConsoleWindowHandle());

    // load a WAV file
    cout << "Loading MIDI File..." << endl;
    CSoundPtr snd = g_AudioMgr.LoadMIDI("test.mid");
    
    // full volume on performance
    GetAudioManager()->SetVolume(CVolume(0));

    cout << "Playing sound..." << endl;
    snd->SetVolume(0);
    snd->Play();

    // set up the notification handler
    CCh6p1StupidNotificationHandler stupidhandler;
    GetAudioManager()->SetNotificationHandler(&stupidhandler);

    CMIDIMusic *music = dynamic_cast<CMIDIMusic *>(snd.Get());
    
    if (music) {
      int originaltempo = music->GetTempo();
      cout << "Tempo is currently " << originaltempo << " beats per minute..." << endl;

      cout << "Press a key to change it to 175 BPM..." << endl;
      getch();

      music->SetTempo(175);

      cout << "Tempo is currently " << music->GetTempo() << " beats per minute..." << endl;

      cout << "Press a key to change it back to " << originaltempo << " BPM..." << endl;
      getch();

      music->SetTempo(originaltempo);
    }

    // play with master tempo
    cout << "Press a key to change the master tempo to 2..." << endl;
    getch();
    GetAudioManager()->SetMasterTempoScaleFactor(2.0f);

    cout << "Press a key to change the master tempo back to 1..." << endl;
    getch();
    GetAudioManager()->SetMasterTempoScaleFactor(1.0f);

    cout << "Keep listening to the song or press a key to stop." << endl;

    // pretend this is your main game loop
    while (music->IsPlaying() && !kbhit()) {
      GetAudioManager()->DispatchNotificationMessages();
      Sleep(100);
    }

    if (kbhit()) getch(); // remove key that kbhit detected
    
    // uninit audio manager
    cout << endl << "UnIniting audio manager..." << endl;
    g_AudioMgr.UnInit();

  } 
  catch(CError &e) {
    MessageBox(GetConsoleWindowHandle(), e.GetMessageBoxString().c_str(), "Ch6p1_MIDIPlayback", MB_ICONSTOP);
    Exit(-1);
  }
  catch(...) {
    MessageBox(GetConsoleWindowHandle(), "This sample program has encountered an error and must close.", "Ch6p1_MIDIPlayback", MB_ICONSTOP);
    Exit(-1);
  }
  Exit(0);
}