windows-nt/Source/XPSP1/NT/multimedia/directx/dmusic/dmscript/trackhelp.cpp

// Copyright (c) 1999 Microsoft Corporation. All rights reserved.
//
// Base classes that implement aspects of a standard DirectMusic track.
// Implementations for CBasicTrack.
//

#include "trackhelp.h"
#include "validate.h"

//////////////////////////////////////////////////////////////////////
// Creation

CBasicTrack::CBasicTrack(long *plModuleLockCounter, const CLSID &rclsid)
  : m_cRef(0),
	m_plModuleLockCounter(plModuleLockCounter),
	m_rclsid(rclsid)
{
	InitializeCriticalSection(&m_CriticalSection);
	InterlockedIncrement(plModuleLockCounter);
}

//////////////////////////////////////////////////////////////////////
// IUnknown

STDMETHODIMP 
CBasicTrack::QueryInterface(const IID &iid, void **ppv)
{
	V_INAME(CBasicTrack::QueryInterface);
	V_PTRPTR_WRITE(ppv);
	V_REFGUID(iid);

	if (iid == IID_IUnknown || iid == IID_IDirectMusicTrack || iid == IID_IDirectMusicTrack8)
		*ppv = static_cast<IDirectMusicTrack8*>(this);
	else if (iid == IID_IPersistStream)
		*ppv = static_cast<IPersistStream*>(this);
	else if (iid == IID_IPersist)
		*ppv = static_cast<IPersist*>(this);
	else
	{
		*ppv = NULL;
		return E_NOINTERFACE;
	}
	
	reinterpret_cast<IUnknown*>(this)->AddRef();
	return S_OK;
}

STDMETHODIMP_(ULONG)
CBasicTrack::AddRef()
{
	return InterlockedIncrement(&m_cRef);
}

STDMETHODIMP_(ULONG)
CBasicTrack::Release()
{
	if (!InterlockedDecrement(&m_cRef))
	{
		DeleteCriticalSection(&m_CriticalSection);
		delete this;
		return 0;
	}

	return m_cRef;
}

//////////////////////////////////////////////////////////////////////
// IUnknown

STDMETHODIMP
CBasicTrack::GetClassID(CLSID* pClassID)
{
	V_INAME(CBasicTrack::GetClassID);
	V_PTR_WRITE(pClassID, sizeof(pClassID));
	*pClassID = m_rclsid;
	return S_OK;
}

//////////////////////////////////////////////////////////////////////
// IDirectMusicTrack

STDMETHODIMP
CBasicTrack::Init(IDirectMusicSegment *pSegment)
{
	V_INAME(CBasicTrack::Init);
	V_INTERFACE(pSegment);
	return S_OK;
}

STDMETHODIMP
CBasicTrack::Play(
		void *pStateData,
		MUSIC_TIME mtStart,
		MUSIC_TIME mtEnd,
		MUSIC_TIME mtOffset,
		DWORD dwFlags,
		IDirectMusicPerformance* pPerf,
		IDirectMusicSegmentState* pSegSt,
		DWORD dwVirtualID)
{
	return this->PlayMusicOrClock(
					pStateData,
					mtStart,
					mtEnd,
					mtOffset,
					0,
					dwFlags,
					pPerf,
					pSegSt,
					dwVirtualID,
					false);
}

//////////////////////////////////////////////////////////////////////
// IDirectMusicTrack8

STDMETHODIMP CBasicTrack::PlayEx(
		void* pStateData,
		REFERENCE_TIME rtStart,
		REFERENCE_TIME rtEnd,
		REFERENCE_TIME rtOffset,
		DWORD dwFlags,
		IDirectMusicPerformance* pPerf,
		IDirectMusicSegmentState* pSegSt,
		DWORD dwVirtualID)
{
    if (dwFlags & DMUS_TRACKF_CLOCK)
    {
	    // Convert all reference times to millisecond times and then just use them as if this were MUSIC_TIME.
	    return this->PlayMusicOrClock(
					pStateData,
					static_cast<MUSIC_TIME>(rtStart / gc_RefPerMil),
					static_cast<MUSIC_TIME>(rtEnd / gc_RefPerMil),
					static_cast<MUSIC_TIME>(rtOffset / gc_RefPerMil),
					rtOffset,
					dwFlags,
					pPerf,
					pSegSt,
					dwVirtualID,
					true);
    }
    else
    {
        return this->PlayMusicOrClock(
					pStateData,
					static_cast<MUSIC_TIME>(rtStart),
					static_cast<MUSIC_TIME>(rtEnd),
					static_cast<MUSIC_TIME>(rtOffset),
					0,
					dwFlags,
					pPerf,
					pSegSt,
					dwVirtualID,
					false);
    }
}

STDMETHODIMP CBasicTrack::GetParamEx(
		REFGUID rguidType,
		REFERENCE_TIME rtTime,
		REFERENCE_TIME* prtNext,
		void* pParam,
        void * pStateData,
        DWORD dwFlags)
{
    HRESULT hr;
    MUSIC_TIME mtNext;
    if (dwFlags & DMUS_TRACK_PARAMF_CLOCK)
    {
	    hr = GetParam(rguidType, static_cast<MUSIC_TIME>(rtTime / gc_RefPerMil), &mtNext, pParam);
	    if (prtNext)
	    {
		    *prtNext = mtNext * gc_RefPerMil;
	    }
    }
    else
    {
	    hr = GetParam(rguidType, static_cast<MUSIC_TIME>(rtTime), &mtNext, pParam);
        if (prtNext)
        {
            *prtNext = mtNext;
        }
    }
    return hr;
}

STDMETHODIMP CBasicTrack::SetParamEx(
		REFGUID rguidType,
		REFERENCE_TIME rtTime,
		void* pParam, void * pStateData, DWORD dwFlags) 
{
    if (dwFlags & DMUS_TRACK_PARAMF_CLOCK)
    {
        rtTime /= gc_RefPerMil;
    }
	return SetParam(rguidType, static_cast<MUSIC_TIME>(rtTime ), pParam);
}

STDMETHODIMP CBasicTrack::Compose(
		IUnknown* pContext, 
		DWORD dwTrackGroup,
		IDirectMusicTrack** ppResultTrack) 
{
	return E_NOTIMPL;
}

STDMETHODIMP CBasicTrack::Join(
		IDirectMusicTrack* pNewTrack,
		MUSIC_TIME mtJoin,
		IUnknown* pContext,
		DWORD dwTrackGroup,
		IDirectMusicTrack** ppResultTrack) 
{
	return E_NOTIMPL;
}