Windows Game Programming for Dummies (2nd Edition)/WinGamProgFD.iso/pc/DirectX SDK/DXSDK/samples/Multimedia/Common/src/dmutil.cpp

C/C++ Source or Header | 2001-10-31 | 22.6 KB | 690 lines

//-----------------------------------------------------------------------------
// File: DMUtil.cpp
//
// Desc: DirectMusic framework classes for playing DirectMusic segments and
//       DirectMusic scripts. Feel free to use this class as a starting point
//       for adding extra functionality.
//
// Copyright (c) 1999-2001 Microsoft Corp. All rights reserved.
//-----------------------------------------------------------------------------
#define STRICT
#include <dmusicc.h>
#include <dmusici.h>
#include <dsound.h>
#include <dxerr8.h>
#include "DMUtil.h"
#include "DXUtil.h"




//-----------------------------------------------------------------------------
// Name: CMusicManager::CMusicManager()
// Desc: Constructs the class
//-----------------------------------------------------------------------------
CMusicManager::CMusicManager()
{
    m_pLoader       = NULL;
    m_pPerformance  = NULL;

    // Initialize COM
    HRESULT hr = CoInitialize(NULL);
    m_bCleanupCOM = SUCCEEDED(hr);
}




//-----------------------------------------------------------------------------
// Name: CMusicManager::~CMusicManager()
// Desc: Destroys the class
//-----------------------------------------------------------------------------
CMusicManager::~CMusicManager()
{
    SAFE_RELEASE( m_pLoader );

    if( m_pPerformance )
    {
        // If there is any music playing, stop it.
        m_pPerformance->Stop( NULL, NULL, 0, 0 );
        m_pPerformance->CloseDown();

        SAFE_RELEASE( m_pPerformance );
    }

    if( m_bCleanupCOM )
        CoUninitialize();
}




//-----------------------------------------------------------------------------
// Name: CMusicManager::Initialize()
// Desc: Inits DirectMusic using a standard audio path
//-----------------------------------------------------------------------------
HRESULT CMusicManager::Initialize( HWND hWnd, DWORD dwPChannels, DWORD dwDefaultPathType )
{
    HRESULT hr;

    // Create loader object
    if( FAILED( hr = CoCreateInstance( CLSID_DirectMusicLoader, NULL, CLSCTX_INPROC,
                                       IID_IDirectMusicLoader8, (void**)&m_pLoader ) ) )
        return DXTRACE_ERR( TEXT("CoCreateInstance"), hr );

    // Create performance object
    if( FAILED( hr = CoCreateInstance( CLSID_DirectMusicPerformance, NULL, CLSCTX_INPROC,
                                       IID_IDirectMusicPerformance8, (void**)&m_pPerformance ) ) )
        return DXTRACE_ERR( TEXT("CoCreateInstance"), hr );

    // Initialize the performance with the standard audio path.
    // This initializes both DirectMusic and DirectSound and
    // sets up the synthesizer. Typcially its easist to use an
    // audio path for playing music and sound effects.
    if( FAILED( hr = m_pPerformance->InitAudio( NULL, NULL, hWnd, dwDefaultPathType,
                                                dwPChannels, DMUS_AUDIOF_ALL, NULL ) ) )
    {
        if( hr == DSERR_NODRIVER )
        {
            DXTRACE( "Warning: No sound card found\n" );
            return hr;
        }

        return DXTRACE_ERR( TEXT("InitAudio"), hr );
    }

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: CMusicManager::SetSearchDirectory()
// Desc: Sets the search directory.  If not called, the current working
//       directory is used to load content.
//-----------------------------------------------------------------------------
HRESULT CMusicManager::SetSearchDirectory( const TCHAR* strMediaPath )
{
    if( NULL == m_pLoader )
        return E_UNEXPECTED;

    // DMusic only takes wide strings
    WCHAR wstrMediaPath[MAX_PATH];
    DXUtil_ConvertGenericStringToWide( wstrMediaPath, strMediaPath );

    return m_pLoader->SetSearchDirectory( GUID_DirectMusicAllTypes,
                                          wstrMediaPath, FALSE );
}




//-----------------------------------------------------------------------------
// Name: CMusicManager::GetDefaultAudioPath()
// Desc:
//-----------------------------------------------------------------------------
IDirectMusicAudioPath8* CMusicManager::GetDefaultAudioPath()
{
    IDirectMusicAudioPath8* pAudioPath = NULL;
    if( NULL == m_pPerformance )
        return NULL;

    m_pPerformance->GetDefaultAudioPath( &pAudioPath );
    return pAudioPath;
}




//-----------------------------------------------------------------------------
// Name: CMusicManager::CollectGarbage()
// Desc: Tells the loader to cleanup any garbage from previously
//       released objects.
//-----------------------------------------------------------------------------
VOID CMusicManager::CollectGarbage()
{
    if( m_pLoader )
        m_pLoader->CollectGarbage();
}




//-----------------------------------------------------------------------------
// Name: CMusicManager::CreateSegmentFromFile()
// Desc:
//-----------------------------------------------------------------------------
HRESULT CMusicManager::CreateSegmentFromFile( CMusicSegment** ppSegment,
                                              TCHAR* strFileName,
                                              BOOL bDownloadNow,
                                              BOOL bIsMidiFile )
{
    HRESULT               hr;
    IDirectMusicSegment8* pSegment = NULL;

    // DMusic only takes wide strings
    WCHAR wstrFileName[MAX_PATH];
    DXUtil_ConvertGenericStringToWide( wstrFileName, strFileName );

    if ( FAILED( hr = m_pLoader->LoadObjectFromFile( CLSID_DirectMusicSegment,
                                                     IID_IDirectMusicSegment8,
                                                     wstrFileName,
                                                     (LPVOID*) &pSegment ) ) )
    {
        if( hr == DMUS_E_LOADER_FAILEDOPEN )
            return hr;
        return DXTRACE_ERR( TEXT("LoadObjectFromFile"), hr );
    }

    *ppSegment = new CMusicSegment( m_pPerformance, m_pLoader, pSegment );
    if (!*ppSegment)
        return E_OUTOFMEMORY;

    if( bIsMidiFile )
    {
        if( FAILED( hr = pSegment->SetParam( GUID_StandardMIDIFile,
                                             0xFFFFFFFF, 0, 0, NULL ) ) )
            return DXTRACE_ERR( TEXT("SetParam"), hr );
    }

    if( bDownloadNow )
    {
        if( FAILED( hr = (*ppSegment)->Download() ) )
            return DXTRACE_ERR( TEXT("Download"), hr );
    }

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: CMusicManager::CreateSegmentFromResource()
// Desc:
//-----------------------------------------------------------------------------
HRESULT CMusicManager::CreateSegmentFromResource( CMusicSegment** ppSegment,
                                                  TCHAR* strResource,
                                                  TCHAR* strResourceType,
                                                  BOOL bDownloadNow,
                                                  BOOL bIsMidiFile )
{
    HRESULT               hr;
    IDirectMusicSegment8* pSegment      = NULL;
    HRSRC                 hres          = NULL;
    void*                 pMem          = NULL;
    DWORD                 dwSize        = 0;
    DMUS_OBJECTDESC       objdesc;

    // Find the resource
    hres = FindResource( NULL,strResource,strResourceType );
    if( NULL == hres )
        return E_FAIL;

    // Load the resource
    pMem = (void*)LoadResource( NULL, hres );
    if( NULL == pMem )
        return E_FAIL;

    // Store the size of the resource
    dwSize = SizeofResource( NULL, hres );

    // Set up our object description
    ZeroMemory(&objdesc,sizeof(DMUS_OBJECTDESC));
    objdesc.dwSize = sizeof(DMUS_OBJECTDESC);
    objdesc.dwValidData = DMUS_OBJ_MEMORY | DMUS_OBJ_CLASS;
    objdesc.guidClass = CLSID_DirectMusicSegment;
    objdesc.llMemLength =(LONGLONG)dwSize;
    objdesc.pbMemData = (BYTE*)pMem;

    if (FAILED ( hr = m_pLoader->GetObject( &objdesc,
                                            IID_IDirectMusicSegment8,
                                            (void**)&pSegment ) ) )
    {
        if( hr == DMUS_E_LOADER_FAILEDOPEN )
            return hr;
        return DXTRACE_ERR( TEXT("LoadObjectFromFile"), hr );
    }

    *ppSegment = new CMusicSegment( m_pPerformance, m_pLoader, pSegment );
    if( NULL == *ppSegment )
        return E_OUTOFMEMORY;

    if( bIsMidiFile )
    {
        // Do this to make sure that the default General MIDI set
        // is connected appropriately to the MIDI file and
        // all instruments sound correct.
        if( FAILED( hr = pSegment->SetParam( GUID_StandardMIDIFile,
                                             0xFFFFFFFF, 0, 0, NULL ) ) )
            return DXTRACE_ERR( TEXT("SetParam"), hr );
    }

    if( bDownloadNow )
    {
        // The segment needs to be download first before playing.
        // However, some apps may want to wait before calling this
        // to because the download allocates memory for the
        // instruments. The more instruments currently downloaded,
        // the more memory is in use by the synthesizer.
        if( FAILED( hr = (*ppSegment)->Download() ) )
            return DXTRACE_ERR( TEXT("Download"), hr );
    }

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: CMusicManager::CreateScriptFromFile()
// Desc:
//-----------------------------------------------------------------------------
HRESULT CMusicManager::CreateScriptFromFile( CMusicScript** ppScript,
                                             TCHAR* strFileName )
{
    HRESULT               hr;
    IDirectMusicScript* pScript = NULL;

    // DMusic only takes wide strings
    WCHAR wstrFileName[MAX_PATH];
    DXUtil_ConvertGenericStringToWide( wstrFileName, strFileName );

    if ( FAILED( hr = m_pLoader->LoadObjectFromFile( CLSID_DirectMusicScript,
                                                     IID_IDirectMusicScript8,
                                                     wstrFileName,
                                                     (LPVOID*) &pScript ) ) )
        return DXTRACE_ERR_NOMSGBOX( TEXT("LoadObjectFromFile"), hr );

    if ( FAILED( hr = pScript->Init( m_pPerformance, NULL ) ) )
        return DXTRACE_ERR( TEXT("Init"), hr );

    *ppScript = new CMusicScript( m_pPerformance, m_pLoader, pScript );
    if (!*ppScript)
        return E_OUTOFMEMORY;

    return hr;
}




//-----------------------------------------------------------------------------
// Name: CMusicManager::CreateChordMapFromFile()
// Desc:
//-----------------------------------------------------------------------------
HRESULT CMusicManager::CreateChordMapFromFile( IDirectMusicChordMap8** ppChordMap,
                                               TCHAR* strFileName )
{
    // DMusic only takes wide strings
    WCHAR wstrFileName[MAX_PATH];
    DXUtil_ConvertGenericStringToWide( wstrFileName, strFileName );

    return m_pLoader->LoadObjectFromFile( CLSID_DirectMusicChordMap,
                                          IID_IDirectMusicChordMap8,
                                          wstrFileName, (LPVOID*) ppChordMap );
}




//-----------------------------------------------------------------------------
// Name: CMusicManager::CreateChordMapFromFile()
// Desc:
//-----------------------------------------------------------------------------
HRESULT CMusicManager::CreateStyleFromFile( IDirectMusicStyle8** ppStyle,
                                            TCHAR* strFileName )
{
    // DMusic only takes wide strings
    WCHAR wstrFileName[MAX_PATH];
    DXUtil_ConvertGenericStringToWide( wstrFileName, strFileName );

    return m_pLoader->LoadObjectFromFile( CLSID_DirectMusicStyle,
                                          IID_IDirectMusicStyle8,
                                          wstrFileName, (LPVOID*) ppStyle );
}




//-----------------------------------------------------------------------------
// Name: CMusicManager::GetMotifFromStyle()
// Desc:
//-----------------------------------------------------------------------------
HRESULT CMusicManager::GetMotifFromStyle( IDirectMusicSegment8** ppMotif8,
                                          TCHAR* strStyle, TCHAR* strMotif )
{
    HRESULT              hr;
    IDirectMusicStyle8*  pStyle = NULL;
    IDirectMusicSegment* pMotif = NULL;

    if( FAILED( hr = CreateStyleFromFile( &pStyle, strStyle ) ) )
        return DXTRACE_ERR( TEXT("CreateStyleFromFile"), hr );

    if( pStyle )
    {
        // DMusic only takes wide strings
        WCHAR wstrMotif[MAX_PATH];
        DXUtil_ConvertGenericStringToWide( wstrMotif, strMotif );

        hr = pStyle->GetMotif( wstrMotif, &pMotif );
        SAFE_RELEASE( pStyle );

        if( FAILED( hr ) )
            return DXTRACE_ERR( TEXT("GetMotif"), hr );

        pMotif->QueryInterface( IID_IDirectMusicSegment8, (LPVOID*) ppMotif8 );
    }

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: CMusicSegment::CMusicSegment()
// Desc: Constructs the class
//-----------------------------------------------------------------------------
CMusicSegment::CMusicSegment( IDirectMusicPerformance8* pPerformance,
                              IDirectMusicLoader8*      pLoader,
                              IDirectMusicSegment8*     pSegment )
{
    m_pPerformance          = pPerformance;
    m_pLoader               = pLoader;
    m_pSegment              = pSegment;
    m_pEmbeddedAudioPath    = NULL;
    m_bDownloaded           = FALSE;

    // Try to pull out an audio path from the segment itself if there is one.
    // This embedded audio path will be used instead of the default
    // audio path if the app doesn't wish to use an overriding audio path.
    IUnknown* pConfig = NULL;
    if( SUCCEEDED( m_pSegment->GetAudioPathConfig( &pConfig ) ) )
    {
        m_pPerformance->CreateAudioPath( pConfig, TRUE, &m_pEmbeddedAudioPath );
        SAFE_RELEASE( pConfig );
    }

}




//-----------------------------------------------------------------------------
// Name: CMusicSegment::~CMusicSegment()
// Desc: Destroys the class
//-----------------------------------------------------------------------------
CMusicSegment::~CMusicSegment()
{
    if( m_pSegment )
    {
        // Tell the loader that this object should now be released
        if( m_pLoader )
            m_pLoader->ReleaseObjectByUnknown( m_pSegment );

        if( m_bDownloaded )
        {
            if( m_pEmbeddedAudioPath )
                m_pSegment->Unload( m_pEmbeddedAudioPath );
            else
                m_pSegment->Unload( m_pPerformance );
        }

        SAFE_RELEASE( m_pEmbeddedAudioPath );
        SAFE_RELEASE( m_pSegment );
    }

    m_pPerformance = NULL;
}




//-----------------------------------------------------------------------------
// Name: CMusicSegment::Play()
// Desc: Plays the sound using voice management flags.  Pass in DSBPLAY_LOOPING
//       in the dwFlags to loop the sound
//-----------------------------------------------------------------------------
HRESULT CMusicSegment::Play( DWORD dwFlags, IDirectMusicAudioPath8* pAudioPath )
{
    if( m_pSegment == NULL || m_pPerformance == NULL )
        return CO_E_NOTINITIALIZED;

    if( !m_bDownloaded )
        return E_FAIL;

    // If an audio path was passed in then use it, otherwise
    // use the embedded audio path if there was one.
    if( pAudioPath == NULL && m_pEmbeddedAudioPath != NULL )
        pAudioPath = m_pEmbeddedAudioPath;

    // If pAudioPath is NULL then this plays on the default audio path.
    return m_pPerformance->PlaySegmentEx( m_pSegment, 0, NULL, dwFlags,
                                          0, 0, NULL, pAudioPath );
}





//-----------------------------------------------------------------------------
// Name: CMusicSegment::Download()
// Desc:
//-----------------------------------------------------------------------------
HRESULT CMusicSegment::Download( IDirectMusicAudioPath8* pAudioPath )
{
    HRESULT hr;

    if( m_pSegment == NULL )
        return CO_E_NOTINITIALIZED;

    // If no audio path was passed in, then download
    // to the embedded audio path if it exists
    // else download to the performance
    if( pAudioPath == NULL )
    {
        if( m_pEmbeddedAudioPath )
            hr = m_pSegment->Download( m_pEmbeddedAudioPath );
        else
            hr = m_pSegment->Download( m_pPerformance );
    }
    else
    {
        hr = m_pSegment->Download( pAudioPath );
    }

    if ( SUCCEEDED( hr ) )
        m_bDownloaded = TRUE;

    return hr;
}




//-----------------------------------------------------------------------------
// Name: CMusicSegment::Unload()
// Desc:
//-----------------------------------------------------------------------------
HRESULT CMusicSegment::Unload( IDirectMusicAudioPath8* pAudioPath )
{
    HRESULT hr;

    if( m_pSegment == NULL )
        return CO_E_NOTINITIALIZED;

    // If no audio path was passed in, then unload
    // from the embedded audio path if it exists
    // else unload from the performance
    if( pAudioPath == NULL )
    {
        if( m_pEmbeddedAudioPath )
            hr = m_pSegment->Unload( m_pEmbeddedAudioPath );
        else
            hr = m_pSegment->Unload( m_pPerformance );
    }
    else
    {
        hr = m_pSegment->Unload( pAudioPath );
    }

    if ( SUCCEEDED( hr ) )
        m_bDownloaded = FALSE;

    return hr;
}




//-----------------------------------------------------------------------------
// Name: CMusicSegment::IsPlaying()
// Desc:
//-----------------------------------------------------------------------------
BOOL CMusicSegment::IsPlaying()
{
    if( m_pSegment == NULL || m_pPerformance == NULL )
        return CO_E_NOTINITIALIZED;

    return ( m_pPerformance->IsPlaying( m_pSegment, NULL ) == S_OK );
}




//-----------------------------------------------------------------------------
// Name: CMusicSegment::Stop()
// Desc: Stops the sound from playing
//-----------------------------------------------------------------------------
HRESULT CMusicSegment::Stop( DWORD dwFlags )
{
    if( m_pSegment == NULL || m_pPerformance == NULL )
        return CO_E_NOTINITIALIZED;

    return m_pPerformance->Stop( m_pSegment, NULL, 0, dwFlags );;
}




//-----------------------------------------------------------------------------
// Name: CMusicSegment::SetRepeats()
// Desc:
//-----------------------------------------------------------------------------
HRESULT CMusicSegment::SetRepeats( DWORD dwRepeats )
{
    if( m_pSegment == NULL )
        return CO_E_NOTINITIALIZED;

    return m_pSegment->SetRepeats( dwRepeats );
}




//-----------------------------------------------------------------------------
// Name: CMusicSegment::GetStyle()
// Desc:
//-----------------------------------------------------------------------------
HRESULT CMusicSegment::GetStyle( IDirectMusicStyle8** ppStyle, DWORD dwStyleIndex )
{
    // Get the Style from the Segment by calling the Segment's GetData() with
    // the data type GUID_StyleTrackStyle. 0xffffffff indicates to look at
    // tracks in all TrackGroups in the segment. The first 0 indicates to
    // retrieve the Style from the first Track  in the indicated TrackGroup.
    // The second 0 indicates to retrieve the Style from the beginning of the
    // segment, i.e. time 0 in Segment time. If this Segment was loaded from a
    // section file, there is only one Style and it is at time 0.
    return m_pSegment->GetParam( GUID_IDirectMusicStyle, 0xffffffff, dwStyleIndex,
                                 0, NULL, (VOID*)ppStyle );
}



//-----------------------------------------------------------------------------
// Name: CMusicScript::CMusicScript()
// Desc: Constructs the class
//-----------------------------------------------------------------------------
CMusicScript::CMusicScript( IDirectMusicPerformance8* pPerformance,
                            IDirectMusicLoader8* pLoader,
                            IDirectMusicScript8* pScript )
{
    m_pPerformance = pPerformance;
    m_pLoader      = pLoader;
    m_pScript      = pScript;
}




//-----------------------------------------------------------------------------
// Name: CMusicScript::~CMusicScript()
// Desc: Destroys the class
//-----------------------------------------------------------------------------
CMusicScript::~CMusicScript()
{
    if( m_pLoader )
    {
        // Tell the loader that this object should now be released
        m_pLoader->ReleaseObjectByUnknown( m_pScript );
        m_pLoader = NULL;
    }

    SAFE_RELEASE( m_pScript );
    m_pPerformance = NULL;
}




//-----------------------------------------------------------------------------
// Name: CMusicScript::Play()
// Desc: Calls a routine in the script
//-----------------------------------------------------------------------------
HRESULT CMusicScript::CallRoutine( TCHAR* strRoutine )
{
    // DMusic only takes wide strings
    WCHAR wstrRoutine[MAX_PATH];
    DXUtil_ConvertGenericStringToWide( wstrRoutine, strRoutine );

    return m_pScript->CallRoutine( wstrRoutine, NULL );
}




//-----------------------------------------------------------------------------
// Name: CMusicScript::SetVariableNumber()
// Desc: Sets the value of a variable in the script
//-----------------------------------------------------------------------------
HRESULT CMusicScript::SetVariableNumber( TCHAR* strVariable, LONG lValue )
{
    // DMusic only takes wide strings
    WCHAR wstrVariable[MAX_PATH];
    DXUtil_ConvertGenericStringToWide( wstrVariable, strVariable );

    return m_pScript->SetVariableNumber( wstrVariable, lValue, NULL );
}




//-----------------------------------------------------------------------------
// Name: CMusicScript::GetVariableNumber()
// Desc: Gets the value of a variable in the script
//-----------------------------------------------------------------------------
HRESULT CMusicScript::GetVariableNumber( TCHAR* strVariable, LONG* plValue )
{
    // DMusic only takes wide strings
    WCHAR wstrVariable[MAX_PATH];
    DXUtil_ConvertGenericStringToWide( wstrVariable, strVariable );

    return m_pScript->GetVariableNumber( wstrVariable, plValue, NULL );
}