/* IDirectMusicStyleTrack Implementation
 *
 * Copyright (C) 2003-2004 Rok Mandeljc
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "dmstyle_private.h"

WINE_DEFAULT_DEBUG_CHANNEL(dmstyle);
WINE_DECLARE_DEBUG_CHANNEL(dmfile);

/*****************************************************************************
 * IDirectMusicStyleTrack implementation
 */
typedef struct IDirectMusicStyleTrack {
    IDirectMusicTrack8 IDirectMusicTrack8_iface;
    const IPersistStreamVtbl *PersistStreamVtbl;
    LONG ref;
    DMUS_OBJECTDESC *pDesc;
    struct list Items;
} IDirectMusicStyleTrack;

/* IDirectMusicStyleTrack IDirectMusicTrack8 part: */
static inline IDirectMusicStyleTrack *impl_from_IDirectMusicTrack8(IDirectMusicTrack8 *iface)
{
    return CONTAINING_RECORD(iface, IDirectMusicStyleTrack, IDirectMusicTrack8_iface);
}

static HRESULT WINAPI IDirectMusicTrack8Impl_QueryInterface(IDirectMusicTrack8 *iface, REFIID riid,
        void **ret_iface)
{
    IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);

    TRACE("(%p, %s, %p)\n", This, debugstr_dmguid(riid), ret_iface);

    *ret_iface = NULL;

    if (IsEqualIID(riid, &IID_IUnknown) || IsEqualIID(riid, &IID_IDirectMusicTrack) ||
            IsEqualIID(riid, &IID_IDirectMusicTrack8))
        *ret_iface = iface;
    else if (IsEqualIID(riid, &IID_IPersistStream))
        *ret_iface = &This->PersistStreamVtbl;
    else {
        WARN("(%p, %s, %p): not found\n", This, debugstr_dmguid(riid), ret_iface);
        return E_NOINTERFACE;
    }

    IUnknown_AddRef((IUnknown*)*ret_iface);
    return S_OK;
}

static ULONG WINAPI IDirectMusicTrack8Impl_AddRef(IDirectMusicTrack8 *iface)
{
    IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);
    LONG ref = InterlockedIncrement(&This->ref);

    TRACE("(%p) ref=%d\n", This, ref);

    return ref;
}

static ULONG WINAPI IDirectMusicTrack8Impl_Release(IDirectMusicTrack8 *iface)
{
    IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);
    LONG ref = InterlockedDecrement(&This->ref);

    TRACE("(%p) ref=%d\n", This, ref);

    if (!ref) {
        HeapFree(GetProcessHeap(), 0, This);
        DMSTYLE_UnlockModule();
    }

    return ref;
}

static HRESULT WINAPI IDirectMusicTrack8Impl_Init(IDirectMusicTrack8 *iface,
        IDirectMusicSegment *pSegment)
{
        IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);
	FIXME("(%p, %p): stub\n", This, pSegment);
	return S_OK;
}

static HRESULT WINAPI IDirectMusicTrack8Impl_InitPlay(IDirectMusicTrack8 *iface,
        IDirectMusicSegmentState *pSegmentState, IDirectMusicPerformance *pPerformance,
        void **ppStateData, DWORD dwVirtualTrack8ID, DWORD dwFlags)
{
        IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);
	FIXME("(%p, %p, %p, %p, %d, %d): stub\n", This, pSegmentState, pPerformance, ppStateData, dwVirtualTrack8ID, dwFlags);
	return S_OK;
}

static HRESULT WINAPI IDirectMusicTrack8Impl_EndPlay(IDirectMusicTrack8 *iface, void *pStateData)
{
        IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);
	FIXME("(%p, %p): stub\n", This, pStateData);
	return S_OK;
}

static HRESULT WINAPI IDirectMusicTrack8Impl_Play(IDirectMusicTrack8 *iface, void *pStateData,
        MUSIC_TIME mtStart, MUSIC_TIME mtEnd, MUSIC_TIME mtOffset, DWORD dwFlags,
        IDirectMusicPerformance *pPerf, IDirectMusicSegmentState *pSegSt, DWORD dwVirtualID)
{
        IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);
	FIXME("(%p, %p, %d, %d, %d, %d, %p, %p, %d): stub\n", This, pStateData, mtStart, mtEnd, mtOffset, dwFlags, pPerf, pSegSt, dwVirtualID);
	return S_OK;
}

static HRESULT WINAPI IDirectMusicTrack8Impl_GetParam(IDirectMusicTrack8 *iface, REFGUID rguidType,
        MUSIC_TIME mtTime, MUSIC_TIME *pmtNext, void *pParam)
{
        IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);
	FIXME("(%p, %s, %d, %p, %p): stub\n", This, debugstr_dmguid(rguidType), mtTime, pmtNext, pParam);
	return S_OK;
}

static HRESULT WINAPI IDirectMusicTrack8Impl_SetParam(IDirectMusicTrack8 *iface, REFGUID rguidType,
        MUSIC_TIME mtTime, void *pParam)
{
        IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);
	FIXME("(%p, %s, %d, %p): stub\n", This, debugstr_dmguid(rguidType), mtTime, pParam);
	return S_OK;
}

static HRESULT WINAPI IDirectMusicTrack8Impl_IsParamSupported(IDirectMusicTrack8 *iface,
        REFGUID rguidType)
{
        IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);

	TRACE("(%p, %s)\n", This, debugstr_dmguid(rguidType));

        if (!rguidType)
                return E_POINTER;

	if (IsEqualGUID (rguidType, &GUID_DisableTimeSig)
		|| IsEqualGUID (rguidType, &GUID_EnableTimeSig)
		|| IsEqualGUID (rguidType, &GUID_IDirectMusicStyle)
		|| IsEqualGUID (rguidType, &GUID_SeedVariations)
		|| IsEqualGUID (rguidType, &GUID_TimeSignature)) {
		TRACE("param supported\n");
		return S_OK;
	}
	TRACE("param unsupported\n");
	return DMUS_E_TYPE_UNSUPPORTED;
}

static HRESULT WINAPI IDirectMusicTrack8Impl_AddNotificationType(IDirectMusicTrack8 *iface,
        REFGUID rguidNotificationType)
{
        IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);
	FIXME("(%p, %s): stub\n", This, debugstr_dmguid(rguidNotificationType));
	return S_OK;
}

static HRESULT WINAPI IDirectMusicTrack8Impl_RemoveNotificationType(IDirectMusicTrack8 *iface,
        REFGUID rguidNotificationType)
{
        IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);
	FIXME("(%p, %s): stub\n", This, debugstr_dmguid(rguidNotificationType));
	return S_OK;
}

static HRESULT WINAPI IDirectMusicTrack8Impl_Clone(IDirectMusicTrack8 *iface, MUSIC_TIME mtStart,
        MUSIC_TIME mtEnd, IDirectMusicTrack **ppTrack)
{
        IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);
	FIXME("(%p, %d, %d, %p): stub\n", This, mtStart, mtEnd, ppTrack);
	return S_OK;
}

static HRESULT WINAPI IDirectMusicTrack8Impl_PlayEx(IDirectMusicTrack8 *iface, void *pStateData,
        REFERENCE_TIME rtStart, REFERENCE_TIME rtEnd, REFERENCE_TIME rtOffset, DWORD dwFlags,
        IDirectMusicPerformance *pPerf, IDirectMusicSegmentState *pSegSt, DWORD dwVirtualID)
{
        IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);
	FIXME("(%p, %p, 0x%s, 0x%s, 0x%s, %d, %p, %p, %d): stub\n", This, pStateData, wine_dbgstr_longlong(rtStart),
	    wine_dbgstr_longlong(rtEnd), wine_dbgstr_longlong(rtOffset), dwFlags, pPerf, pSegSt, dwVirtualID);
	return S_OK;
}

static HRESULT WINAPI IDirectMusicTrack8Impl_GetParamEx(IDirectMusicTrack8 *iface,
        REFGUID rguidType, REFERENCE_TIME rtTime, REFERENCE_TIME *prtNext, void *pParam,
        void *pStateData, DWORD dwFlags)
{
        IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);
	FIXME("(%p, %s, 0x%s, %p, %p, %p, %d): stub\n", This, debugstr_dmguid(rguidType),
	    wine_dbgstr_longlong(rtTime), prtNext, pParam, pStateData, dwFlags);
	return S_OK;
}

static HRESULT WINAPI IDirectMusicTrack8Impl_SetParamEx(IDirectMusicTrack8 *iface,
        REFGUID rguidType, REFERENCE_TIME rtTime, void *pParam, void *pStateData, DWORD dwFlags)
{
        IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);
	FIXME("(%p, %s, 0x%s, %p, %p, %d): stub\n", This, debugstr_dmguid(rguidType),
	    wine_dbgstr_longlong(rtTime), pParam, pStateData, dwFlags);
	return S_OK;
}

static HRESULT WINAPI IDirectMusicTrack8Impl_Compose(IDirectMusicTrack8 *iface, IUnknown *context,
        DWORD trackgroup, IDirectMusicTrack **track)
{
    IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);

    TRACE("(%p, %p, %d, %p): method not implemented\n", This, context, trackgroup, track);
    return E_NOTIMPL;
}

static HRESULT WINAPI IDirectMusicTrack8Impl_Join(IDirectMusicTrack8 *iface,
        IDirectMusicTrack *pNewTrack, MUSIC_TIME mtJoin, IUnknown *pContext, DWORD dwTrackGroup,
        IDirectMusicTrack **ppResultTrack)
{
        IDirectMusicStyleTrack *This = impl_from_IDirectMusicTrack8(iface);
	FIXME("(%p, %p, %d, %p, %d, %p): stub\n", This, pNewTrack, mtJoin, pContext, dwTrackGroup, ppResultTrack);
	return S_OK;
}

static const IDirectMusicTrack8Vtbl dmtrack8_vtbl = {
    IDirectMusicTrack8Impl_QueryInterface,
    IDirectMusicTrack8Impl_AddRef,
    IDirectMusicTrack8Impl_Release,
    IDirectMusicTrack8Impl_Init,
    IDirectMusicTrack8Impl_InitPlay,
    IDirectMusicTrack8Impl_EndPlay,
    IDirectMusicTrack8Impl_Play,
    IDirectMusicTrack8Impl_GetParam,
    IDirectMusicTrack8Impl_SetParam,
    IDirectMusicTrack8Impl_IsParamSupported,
    IDirectMusicTrack8Impl_AddNotificationType,
    IDirectMusicTrack8Impl_RemoveNotificationType,
    IDirectMusicTrack8Impl_Clone,
    IDirectMusicTrack8Impl_PlayEx,
    IDirectMusicTrack8Impl_GetParamEx,
    IDirectMusicTrack8Impl_SetParamEx,
    IDirectMusicTrack8Impl_Compose,
    IDirectMusicTrack8Impl_Join
};

/* IDirectMusicStyleTrack IPersistStream part: */
static HRESULT WINAPI IDirectMusicStyleTrack_IPersistStream_QueryInterface (LPPERSISTSTREAM iface, REFIID riid, LPVOID *ppobj) {
	ICOM_THIS_MULTI(IDirectMusicStyleTrack, PersistStreamVtbl, iface);
	return IDirectMusicTrack8_QueryInterface(&This->IDirectMusicTrack8_iface, riid, ppobj);
}

static ULONG WINAPI IDirectMusicStyleTrack_IPersistStream_AddRef (LPPERSISTSTREAM iface) {
	ICOM_THIS_MULTI(IDirectMusicStyleTrack, PersistStreamVtbl, iface);
	return IDirectMusicTrack8_AddRef(&This->IDirectMusicTrack8_iface);
}

static ULONG WINAPI IDirectMusicStyleTrack_IPersistStream_Release (LPPERSISTSTREAM iface) {
  ICOM_THIS_MULTI(IDirectMusicStyleTrack, PersistStreamVtbl, iface);
  return IDirectMusicTrack8_Release(&This->IDirectMusicTrack8_iface);
}

static HRESULT WINAPI IDirectMusicStyleTrack_IPersistStream_GetClassID (LPPERSISTSTREAM iface, CLSID* pClassID) {
  ICOM_THIS_MULTI(IDirectMusicStyleTrack, PersistStreamVtbl, iface);
  TRACE("(%p, %p)\n", This, pClassID);
  *pClassID = CLSID_DirectMusicStyleTrack;
  return S_OK;
}

static HRESULT WINAPI IDirectMusicStyleTrack_IPersistStream_IsDirty (LPPERSISTSTREAM iface) {
  ICOM_THIS_MULTI(IDirectMusicStyleTrack, PersistStreamVtbl, iface);
  FIXME("(%p): stub, always S_FALSE\n", This);
  return S_FALSE;
}

static HRESULT parse_style_ref(IDirectMusicStyleTrack *This, DMUS_PRIVATE_CHUNK *pChunk,
        IStream *pStm)
{
  DMUS_PRIVATE_CHUNK Chunk;
  DWORD ListSize[3], ListCount[3];
  LARGE_INTEGER liMove; /* used when skipping chunks */
  HRESULT hr;

  IDirectMusicObject* pObject = NULL;
  LPDMUS_PRIVATE_STYLE_ITEM pNewItem = NULL;

  if (pChunk->fccID != DMUS_FOURCC_STYLE_REF_LIST) {
    ERR_(dmfile)(": %s chunk should be a STYLE list\n", debugstr_fourcc (pChunk->fccID));
    return E_FAIL;
  }

  ListSize[0] = pChunk->dwSize - sizeof(FOURCC);
  ListCount[0] = 0;

  do {
    IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
    ListCount[0] += sizeof(FOURCC) + sizeof(DWORD) + Chunk.dwSize;
    TRACE_(dmfile)(": %s chunk (size = %d)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
    switch (Chunk.fccID) { 
    case DMUS_FOURCC_TIME_STAMP_CHUNK: {
      TRACE_(dmfile)(": Time Stamp chunk\n");
      pNewItem = HeapAlloc (GetProcessHeap (), HEAP_ZERO_MEMORY, sizeof(DMUS_PRIVATE_STYLE_ITEM));
      if (NULL == pNewItem) {
	ERR(": no more memory\n");
	return  E_OUTOFMEMORY;
      }
      IStream_Read (pStm, &pNewItem->dwTimeStamp, sizeof(DWORD), NULL);
      TRACE_(dmfile)(" - dwTimeStamp: %u\n", pNewItem->dwTimeStamp);
      list_add_tail (&This->Items, &pNewItem->entry);      
      break;
    }
    case FOURCC_LIST: {
      IStream_Read (pStm, &Chunk.fccID, sizeof(FOURCC), NULL);
      TRACE_(dmfile)(": LIST chunk of type %s", debugstr_fourcc(Chunk.fccID));
      ListSize[1] = Chunk.dwSize - sizeof(FOURCC);
      ListCount[1] = 0;
      switch (Chunk.fccID) { 
	/**
	 * should be a DMRF (DirectMusic Reference) list @TODO
	 */
      case DMUS_FOURCC_REF_LIST: {
	FIXME_(dmfile)(": DMRF (DM References) list, not yet handled\n");
        hr = IDirectMusicUtils_IPersistStream_ParseReference((IPersistStream*)&This->PersistStreamVtbl,
                &Chunk, pStm, &pObject);
	if (FAILED(hr)) {
	  ERR(": could not load Reference\n");
	  return hr;
	}
	hr = IDirectMusicObject_QueryInterface(pObject, &IID_IDirectMusicStyle8, (LPVOID*)&pNewItem->pObject);
	if (FAILED(hr)) {
	  ERR(": Reference not an IDirectMusicStyle, exiting\n");
	  exit(-1);
	  return hr;
	}
	IDirectMusicObject_Release(pObject);
	break;						
      }
      default: {
	TRACE_(dmfile)(": unknown (skipping)\n");
	liMove.QuadPart = Chunk.dwSize - sizeof(FOURCC);
	IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
	break;						
      }
      }	
      break;
    }
    default: {
      TRACE_(dmfile)(": unknown chunk (irrelevant & skipping)\n");
      liMove.QuadPart = Chunk.dwSize;
      IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
      break;						
    }
    }
    TRACE_(dmfile)(": ListCount[0] = %d < ListSize[0] = %d\n", ListCount[0], ListSize[0]);
  } while (ListCount[0] < ListSize[0]);

  return S_OK;
}

static HRESULT parse_styletrack_list(IDirectMusicStyleTrack *This, DMUS_PRIVATE_CHUNK *pChunk,
        IStream *pStm)
{
  DMUS_PRIVATE_CHUNK Chunk;
  DWORD ListSize[3], ListCount[3];
  LARGE_INTEGER liMove; /* used when skipping chunks */
  HRESULT hr;

  if (pChunk->fccID != DMUS_FOURCC_STYLE_TRACK_LIST) {
    ERR_(dmfile)(": %s chunk should be a STYLETRACK list\n", debugstr_fourcc (pChunk->fccID));
    return E_FAIL;
  }  

  ListSize[0] = pChunk->dwSize - sizeof(FOURCC);
  ListCount[0] = 0;

  do {
    IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
    ListCount[0] += sizeof(FOURCC) + sizeof(DWORD) + Chunk.dwSize;
    TRACE_(dmfile)(": %s chunk (size = %d)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
    switch (Chunk.fccID) { 
    case FOURCC_LIST: { 
      IStream_Read (pStm, &Chunk.fccID, sizeof(FOURCC), NULL);
      TRACE_(dmfile)(": LIST chunk of type %s", debugstr_fourcc(Chunk.fccID));
      ListSize[1] = Chunk.dwSize - sizeof(FOURCC);
      ListCount[1] = 0;
      switch (Chunk.fccID) { 
      case DMUS_FOURCC_STYLE_REF_LIST: {
	TRACE_(dmfile)(": STYLE_REF list\n"); 
        hr = parse_style_ref(This, &Chunk, pStm);
	if (FAILED(hr)) return hr;	
	break;
      }
      default: {
	TRACE_(dmfile)(": unknown (skipping)\n");
	liMove.QuadPart = Chunk.dwSize - sizeof(FOURCC);
	IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
	break;						
      }
      }
      break;
    }
    default: {
      TRACE_(dmfile)(": unknown chunk (irrelevant & skipping)\n");
      liMove.QuadPart = Chunk.dwSize;
      IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
      break;		
    }
    }
    TRACE_(dmfile)(": ListCount[0] = %d < ListSize[0] = %d\n", ListCount[0], ListSize[0]);
  } while (ListCount[0] < ListSize[0]);

  return S_OK;
}

static HRESULT WINAPI IDirectMusicStyleTrack_IPersistStream_Load (LPPERSISTSTREAM iface, IStream* pStm) {
  ICOM_THIS_MULTI(IDirectMusicStyleTrack, PersistStreamVtbl, iface);

  DMUS_PRIVATE_CHUNK Chunk;
  LARGE_INTEGER liMove;
  HRESULT hr;
 
  FIXME("(%p, %p): Loading not fully implemented yet\n", This, pStm);

  IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
  TRACE_(dmfile)(": %s chunk (size = %d)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
  switch (Chunk.fccID) {	
  case FOURCC_LIST: {
    IStream_Read (pStm, &Chunk.fccID, sizeof(FOURCC), NULL);
    TRACE_(dmfile)(": %s chunk (size = %d)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
    switch (Chunk.fccID) { 
    case DMUS_FOURCC_STYLE_TRACK_LIST: {
      TRACE_(dmfile)(": Chord track list\n");
      hr = parse_styletrack_list(This, &Chunk, pStm);
      if (FAILED(hr)) return hr;
      break;    
    }
    default: {
      TRACE_(dmfile)(": unexpected chunk; loading failed)\n");
      liMove.QuadPart = Chunk.dwSize;
      IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
      return E_FAIL;
    }
    }
    TRACE_(dmfile)(": reading finished\n");
    break;
  }
  default: {
    TRACE_(dmfile)(": unexpected chunk; loading failed)\n");
    liMove.QuadPart = Chunk.dwSize;
    IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL); /* skip the rest of the chunk */
    return E_FAIL;
  }
  }

  return S_OK;
}

static HRESULT WINAPI IDirectMusicStyleTrack_IPersistStream_Save (LPPERSISTSTREAM iface, IStream* pStm, BOOL fClearDirty) {
  ICOM_THIS_MULTI(IDirectMusicStyleTrack, PersistStreamVtbl, iface);
  FIXME("(%p): Saving not implemented yet\n", This);
  return E_NOTIMPL;
}

static HRESULT WINAPI IDirectMusicStyleTrack_IPersistStream_GetSizeMax (LPPERSISTSTREAM iface, ULARGE_INTEGER* pcbSize) {
  ICOM_THIS_MULTI(IDirectMusicStyleTrack, PersistStreamVtbl, iface);
  FIXME("(%p, %p): stub\n", This, pcbSize);
  return E_NOTIMPL;
}

static const IPersistStreamVtbl DirectMusicStyleTrack_PersistStream_Vtbl = {
  IDirectMusicStyleTrack_IPersistStream_QueryInterface,
  IDirectMusicStyleTrack_IPersistStream_AddRef,
  IDirectMusicStyleTrack_IPersistStream_Release,
  IDirectMusicStyleTrack_IPersistStream_GetClassID,
  IDirectMusicStyleTrack_IPersistStream_IsDirty,
  IDirectMusicStyleTrack_IPersistStream_Load,
  IDirectMusicStyleTrack_IPersistStream_Save,
  IDirectMusicStyleTrack_IPersistStream_GetSizeMax
};

/* for ClassFactory */
HRESULT WINAPI create_dmstyletrack(REFIID lpcGUID, void **ppobj)
{
    IDirectMusicStyleTrack *track;
    HRESULT hr;

    track = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(*track));
    if (!track) {
        *ppobj = NULL;
        return E_OUTOFMEMORY;
    }
    track->IDirectMusicTrack8_iface.lpVtbl = &dmtrack8_vtbl;
  track->PersistStreamVtbl = &DirectMusicStyleTrack_PersistStream_Vtbl;
  track->pDesc = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(DMUS_OBJECTDESC));
  DM_STRUCT_INIT(track->pDesc);
  track->pDesc->dwValidData |= DMUS_OBJ_CLASS;
  track->pDesc->guidClass = CLSID_DirectMusicStyleTrack;
    track->ref = 1;
    list_init (&track->Items);

    DMSTYLE_LockModule();
    hr = IDirectMusicTrack8_QueryInterface(&track->IDirectMusicTrack8_iface, lpcGUID, ppobj);
    IDirectMusicTrack8_Release(&track->IDirectMusicTrack8_iface);

    return hr;
}