Sweden-Number/dlls/dmime/segtriggertrack.c

/* IDirectMusicSegTriggerTrack Implementation
 *
 * Copyright (C) 2003-2004 Rok Mandeljc
 * Copyright (C) 2003-2004 Raphael Junqueira
 *
 * 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 "dmime_private.h"
#include "dmobject.h"

#include "wine/heap.h"

WINE_DEFAULT_DEBUG_CHANNEL(dmime);
WINE_DECLARE_DEBUG_CHANNEL(dmfile);

/*****************************************************************************
 * IDirectMusicSegTriggerTrack implementation
 */
typedef struct IDirectMusicSegTriggerTrack {
    IDirectMusicTrack8 IDirectMusicTrack8_iface;
    struct dmobject dmobj;/* IPersistStream only */
    LONG ref;
    struct list Items;
} IDirectMusicSegTriggerTrack;

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

static HRESULT WINAPI segment_track_QueryInterface(IDirectMusicTrack8 *iface, REFIID riid,
        void **ret_iface)
{
    IDirectMusicSegTriggerTrack *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->dmobj.IPersistStream_iface;
    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 segment_track_AddRef(IDirectMusicTrack8 *iface)
{
    IDirectMusicSegTriggerTrack *This = impl_from_IDirectMusicTrack8(iface);
    LONG ref = InterlockedIncrement(&This->ref);

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

    return ref;
}

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

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

    if (!ref) {
        struct list *cursor, *cursor2;
        DMUS_PRIVATE_SEGMENT_ITEM *item;

        LIST_FOR_EACH_SAFE(cursor, cursor2, &This->Items) {
            item = LIST_ENTRY(cursor, DMUS_PRIVATE_SEGMENT_ITEM, entry);
            list_remove(cursor);

            if (item->pObject)
                IDirectMusicObject_Release(item->pObject);
            heap_free(item);
        }

        heap_free(This);
        DMIME_UnlockModule();
    }

    return ref;
}

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

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

static HRESULT WINAPI segment_track_Play(IDirectMusicTrack8 *iface, void *pStateData,
        MUSIC_TIME mtStart, MUSIC_TIME mtEnd, MUSIC_TIME mtOffset, DWORD dwFlags,
        IDirectMusicPerformance *pPerf, IDirectMusicSegmentState *pSegSt, DWORD dwVirtualID)
{
        IDirectMusicSegTriggerTrack *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 segment_track_GetParam(IDirectMusicTrack8 *iface, REFGUID type,
        MUSIC_TIME time, MUSIC_TIME *next, void *param)
{
    IDirectMusicSegTriggerTrack *This = impl_from_IDirectMusicTrack8(iface);

    TRACE("(%p, %s, %d, %p, %p): not supported\n", This, debugstr_dmguid(type), time, next, param);
    return DMUS_E_GET_UNSUPPORTED;
}

static HRESULT WINAPI segment_track_SetParam(IDirectMusicTrack8 *iface, REFGUID type,
        MUSIC_TIME time, void *param)
{
    IDirectMusicSegTriggerTrack *This = impl_from_IDirectMusicTrack8(iface);

    TRACE("(%p, %s, %d, %p): not supported\n", This, debugstr_dmguid(type), time, param);
    return S_OK;
}

static HRESULT WINAPI segment_track_IsParamSupported(IDirectMusicTrack8 *iface, REFGUID type)
{
    IDirectMusicSegTriggerTrack *This = impl_from_IDirectMusicTrack8(iface);

    TRACE("(%p, %s)\n", This, debugstr_dmguid(type));
    return S_OK;
}

static HRESULT WINAPI segment_track_AddNotificationType(IDirectMusicTrack8 *iface,
        REFGUID notiftype)
{
    IDirectMusicSegTriggerTrack *This = impl_from_IDirectMusicTrack8(iface);

    TRACE("(%p, %s): method not implemented\n", This, debugstr_dmguid(notiftype));
    return E_NOTIMPL;
}

static HRESULT WINAPI segment_track_RemoveNotificationType(IDirectMusicTrack8 *iface,
        REFGUID notiftype)
{
    IDirectMusicSegTriggerTrack *This = impl_from_IDirectMusicTrack8(iface);

    TRACE("(%p, %s): method not implemented\n", This, debugstr_dmguid(notiftype));
    return E_NOTIMPL;
}

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

static HRESULT WINAPI segment_track_PlayEx(IDirectMusicTrack8 *iface, void *pStateData,
        REFERENCE_TIME rtStart, REFERENCE_TIME rtEnd, REFERENCE_TIME rtOffset, DWORD dwFlags,
        IDirectMusicPerformance *pPerf, IDirectMusicSegmentState *pSegSt, DWORD dwVirtualID)
{
        IDirectMusicSegTriggerTrack *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 segment_track_GetParamEx(IDirectMusicTrack8 *iface, REFGUID rguidType,
        REFERENCE_TIME rtTime, REFERENCE_TIME *prtNext, void *pParam, void *pStateData,
        DWORD dwFlags)
{
        IDirectMusicSegTriggerTrack *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 segment_track_SetParamEx(IDirectMusicTrack8 *iface, REFGUID rguidType,
        REFERENCE_TIME rtTime, void *pParam, void *pStateData, DWORD dwFlags)
{
        IDirectMusicSegTriggerTrack *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 segment_track_Compose(IDirectMusicTrack8 *iface, IUnknown *context,
        DWORD trackgroup, IDirectMusicTrack **track)
{
    IDirectMusicSegTriggerTrack *This = impl_from_IDirectMusicTrack8(iface);

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

static HRESULT WINAPI segment_track_Join(IDirectMusicTrack8 *iface, IDirectMusicTrack *newtrack,
        MUSIC_TIME join, IUnknown *context, DWORD trackgroup, IDirectMusicTrack **resulttrack)
{
    IDirectMusicSegTriggerTrack *This = impl_from_IDirectMusicTrack8(iface);
    TRACE("(%p, %p, %d, %p, %d, %p): method not implemented\n", This, newtrack, join, context,
            trackgroup, resulttrack);
    return E_NOTIMPL;
}

static const IDirectMusicTrack8Vtbl dmtrack8_vtbl = {
    segment_track_QueryInterface,
    segment_track_AddRef,
    segment_track_Release,
    segment_track_Init,
    segment_track_InitPlay,
    segment_track_EndPlay,
    segment_track_Play,
    segment_track_GetParam,
    segment_track_SetParam,
    segment_track_IsParamSupported,
    segment_track_AddNotificationType,
    segment_track_RemoveNotificationType,
    segment_track_Clone,
    segment_track_PlayEx,
    segment_track_GetParamEx,
    segment_track_SetParamEx,
    segment_track_Compose,
    segment_track_Join
};

static HRESULT parse_segment(IDirectMusicSegTriggerTrack *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_SEGMENT_ITEM pNewItem = NULL;

  if (pChunk->fccID != DMUS_FOURCC_SEGMENT_LIST) {
    ERR_(dmfile)(": %s chunk should be a SEGMENT 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_SEGMENTITEM_CHUNK: {
      TRACE_(dmfile)(": segment item chunk\n"); 
      /** alloc new item entry */
      pNewItem = HeapAlloc (GetProcessHeap (), HEAP_ZERO_MEMORY, sizeof(DMUS_PRIVATE_SEGMENT_ITEM));
      if (!pNewItem)
        return  E_OUTOFMEMORY;

      IStream_Read (pStm, &pNewItem->header, sizeof(DMUS_IO_SEGMENT_ITEM_HEADER), NULL);
      TRACE_(dmfile)(" - lTimePhysical: %u\n", pNewItem->header.lTimeLogical);
      TRACE_(dmfile)(" - lTimePhysical: %u\n", pNewItem->header.lTimePhysical);
      TRACE_(dmfile)(" - dwPlayFlags: 0x%08x\n", pNewItem->header.dwPlayFlags);
      TRACE_(dmfile)(" - dwFlags: 0x%08x\n", pNewItem->header.dwFlags);
      list_add_tail (&This->Items, &pNewItem->entry);
      break;
    }
    case DMUS_FOURCC_SEGMENTITEMNAME_CHUNK: {
      TRACE_(dmfile)(": segment item name chunk\n");
      if (!pNewItem) {
	ERR(": pNewItem not allocated, bad chunk order?\n");
	return E_FAIL;
      }
      IStream_Read (pStm, pNewItem->wszName, Chunk.dwSize, NULL);
      TRACE_(dmfile)(" - name: %s\n", debugstr_w(pNewItem->wszName));
      break;
    }
    case FOURCC_LIST: {
      struct chunk_entry list = {.id = FOURCC_LIST, .size = Chunk.dwSize};
      static const LARGE_INTEGER zero;
      IStream_Seek(pStm, zero, STREAM_SEEK_CUR, &list.offset);
      list.offset.QuadPart -= sizeof(FOURCC) + sizeof(DWORD);
      IStream_Read (pStm, &Chunk.fccID, sizeof(FOURCC), NULL);
      TRACE_(dmfile)(": LIST chunk of type %s", debugstr_fourcc(Chunk.fccID));
      list.type = Chunk.fccID;
      ListSize[1] = Chunk.dwSize - sizeof(FOURCC);
      ListCount[1] = 0;
      switch (Chunk.fccID) { 
      case DMUS_FOURCC_REF_LIST: {
        TRACE_(dmfile)(": DMRF (DM References) list\n");
        hr = dmobj_parsereference(pStm, &list, &pObject);
	if (FAILED(hr)) {
	  ERR(": could not load Reference\n");
	  return hr;
	}
        if (!pNewItem) {
	  ERR(": pNewItem not allocated, bad chunk order?\n");
	  return E_FAIL;
        }
	pNewItem->pObject = 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_segments_list(IDirectMusicSegTriggerTrack *This, DMUS_PRIVATE_CHUNK *pChunk,
        IStream *pStm)
{
  HRESULT hr = E_FAIL;
  DMUS_PRIVATE_CHUNK Chunk;
  DWORD ListSize[3], ListCount[3];
  LARGE_INTEGER liMove; /* used when skipping chunks */

  if (pChunk->fccID != DMUS_FOURCC_SEGMENTS_LIST) {
    ERR_(dmfile)(": %s chunk should be a SEGMENTS 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_SEGMENT_LIST: {
	TRACE_(dmfile)(": SEGMENT list\n"); 
        hr = parse_segment(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 parse_seqtrack_list(IDirectMusicSegTriggerTrack *This, DMUS_PRIVATE_CHUNK *pChunk,
        IStream *pStm)
{
  HRESULT hr = E_FAIL;
  DMUS_PRIVATE_CHUNK Chunk;
  DWORD ListSize[3], ListCount[3];
  LARGE_INTEGER liMove; /* used when skipping chunks */

  if (pChunk->fccID != DMUS_FOURCC_SEGTRACK_LIST) {
    ERR_(dmfile)(": %s chunk should be a SEGTRACK 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_SEGTRACK_CHUNK: {
      TRACE_(dmfile)(": segment trigger track chunk\n");
      liMove.QuadPart = Chunk.dwSize;
      IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
      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) { 
      case DMUS_FOURCC_SEGMENTS_LIST: {
	TRACE_(dmfile)(": SEGMENTS list\n"); 
        hr = parse_segments_list(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 inline IDirectMusicSegTriggerTrack *impl_from_IPersistStream(IPersistStream *iface)
{
    return CONTAINING_RECORD(iface, IDirectMusicSegTriggerTrack, dmobj.IPersistStream_iface);
}

static HRESULT WINAPI trigger_IPersistStream_Load(IPersistStream *iface, IStream *pStm)
{
  IDirectMusicSegTriggerTrack *This = impl_from_IPersistStream(iface);
  DMUS_PRIVATE_CHUNK Chunk;
  LARGE_INTEGER liMove;
  HRESULT hr;

  TRACE("(%p, %p): Loading\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_SEGTRACK_LIST: {
      TRACE_(dmfile)(": segment trigger track list\n");
      hr = parse_seqtrack_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 const IPersistStreamVtbl persiststream_vtbl = {
    dmobj_IPersistStream_QueryInterface,
    dmobj_IPersistStream_AddRef,
    dmobj_IPersistStream_Release,
    dmobj_IPersistStream_GetClassID,
    unimpl_IPersistStream_IsDirty,
    trigger_IPersistStream_Load,
    unimpl_IPersistStream_Save,
    unimpl_IPersistStream_GetSizeMax
};

/* for ClassFactory */
HRESULT WINAPI create_dmsegtriggertrack(REFIID lpcGUID, void **ppobj)
{
    IDirectMusicSegTriggerTrack *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->ref = 1;
    dmobject_init(&track->dmobj, &CLSID_DirectMusicSegTriggerTrack,
                  (IUnknown *)&track->IDirectMusicTrack8_iface);
    track->dmobj.IPersistStream_iface.lpVtbl = &persiststream_vtbl;
    list_init(&track->Items);

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

    return hr;
}