www.pudn.com > snow.rar > PlayMp3.cpp

#include "PlayMp3.h" 
 
 
// Global MP3 Data 
bool			g_bBackgroundMusicActive = 0; 
IGraphBuilder	*g_pGraph; 
IMediaControl	*g_pMediaControl; 
IMediaEvent		*g_pEvent; 
IMediaSeeking	*g_pSeeking; 
 
//-------------------------------------------------------------------------------------- 
// 
// Function to initialize the the sound graph and load 
// the mp3 file 
// 
//-------------------------------------------------------------------------------------- 
bool bPlayTitleMusic() 
{ 
	HRESULT	hr; 
	 
	// Initialize COM 
	CoInitialize( NULL ); 
 
	// Create the graph 
	CoCreateInstance(	CLSID_FilterGraph,  
						NULL,  
						CLSCTX_INPROC_SERVER,  
						IID_IGraphBuilder,  
						(void **)&g_pGraph ); 
 
	// Query for interface objects 
	g_pGraph->QueryInterface( IID_IMediaControl, (void **)&g_pMediaControl ); 
	g_pGraph->QueryInterface( IID_IMediaEvent, (void **)&g_pEvent ); 
	g_pGraph->QueryInterface( IID_IMediaSeeking, (void **)&g_pSeeking ); 
 
	// Load the song (insert your own file name below) 
	hr = g_pGraph->RenderFile(L"SnowSRC\\And_You_And_I.mp3", NULL); 
	if( hr != S_OK ) { 
		return( 0 ); 
	} 
	// Set the playback rate 
	g_pSeeking->SetRate( 1.00 ); 
	// Play the song 
	g_pMediaControl->Run(); 
	// Set background music active flag 
	g_bBackgroundMusicActive = 1; 
	 
	return( 1 ); 
} 
 
//-------------------------------------------------------------------------------------- 
// 
// Function to clean up the graph and allocated memory 
// 
//-------------------------------------------------------------------------------------- 
void vStopTitleMusic()  
{ 
	// Stop the song if playing 
	g_pMediaControl->Stop(); 
	// Clean up 
	g_pMediaControl->Release(); 
	g_pEvent->Release(); 
	g_pGraph->Release(); 
} 
 
//-------------------------------------------------------------------------------------- 
// 
// Function to check the status of the music to see if it is done and 
// needs to be restarted 
// 
//-------------------------------------------------------------------------------------- 
void vCheckMusicStatus() 
{ 
	long		evCode; 
	 
	// Check the event code 
	g_pEvent->WaitForCompletion( 0, &evCode ); 
	 
	// If the music is done, restart it 
	if( evCode == EC_COMPLETE ) { 
		// Set the starting position to 0 
		LONGLONG lStartPos = 0; 
		// Stop the music 
		g_pMediaControl->Stop(); 
		// Set the positions 
		g_pSeeking->SetPositions( &lStartPos, AM_SEEKING_AbsolutePositioning, NULL, AM_SEEKING_NoPositioning ); 
		// Run the music 
		g_pMediaControl->Run(); 
	} 
} 
//-------------------------------------------------------------------------------------- 
// 
// Function to cleanup allocated objects 
// 
//-------------------------------------------------------------------------------------- 
 
 
void vCleanup( void ) 
{ 
	vStopTitleMusic(); 
}