dlls/dmstyle/commandtrack.c

   1 /* IDirectMusicCommandTrack Implementation
   2  *
   3  * Copyright (C) 2003-2004 Rok Mandeljc
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  18  */
  19
  20 #include "dmstyle_private.h"
  21
  22 WINE_DEFAULT_DEBUG_CHANNEL(dmstyle);
  23 WINE_DECLARE_DEBUG_CHANNEL(dmfile);
  24
  25 static ULONG WINAPI IDirectMusicCommandTrack_IUnknown_AddRef (LPUNKNOWN iface);
  26 static ULONG WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_AddRef (LPDIRECTMUSICTRACK8 iface);
  27 static ULONG WINAPI IDirectMusicCommandTrack_IPersistStream_AddRef (LPPERSISTSTREAM iface);
  28
  29 /*****************************************************************************
  30  * IDirectMusicCommandTrack implementation
  31  */
  32 /* IDirectMusicCommandTrack IUnknown part: */
  33 static HRESULT WINAPI IDirectMusicCommandTrack_IUnknown_QueryInterface (LPUNKNOWN iface, REFIID riid, LPVOID *ppobj) {
  34         ICOM_THIS_MULTI(IDirectMusicCommandTrack, UnknownVtbl, iface);
  35         TRACE("(%p, %s, %p)\n", This, debugstr_dmguid(riid), ppobj);
  36
  37         if (IsEqualIID (riid, &IID_IUnknown)) {
  38                 *ppobj = &This->UnknownVtbl;
  39                 IDirectMusicCommandTrack_IUnknown_AddRef ((LPUNKNOWN)&This->UnknownVtbl);
  40                 return S_OK;
  41         } else if (IsEqualIID (riid, &IID_IDirectMusicTrack)
  42           || IsEqualIID (riid, &IID_IDirectMusicTrack8)) {
  43                 *ppobj = (LPDIRECTMUSICTRACK8)&This->TrackVtbl;
  44                 IDirectMusicCommandTrack_IDirectMusicTrack_AddRef ((LPDIRECTMUSICTRACK8)&This->TrackVtbl);
  45                 return S_OK;
  46         } else if (IsEqualIID (riid, &IID_IPersistStream)) {
  47                 *ppobj = &This->PersistStreamVtbl;
  48                 IDirectMusicCommandTrack_IPersistStream_AddRef ((LPPERSISTSTREAM)&This->PersistStreamVtbl);
  49                 return S_OK;
  50         }
  51
  52         WARN("(%p, %s, %p): not found\n", This, debugstr_dmguid(riid), ppobj);
  53         return E_NOINTERFACE;
  54 }
  55
  56 static ULONG WINAPI IDirectMusicCommandTrack_IUnknown_AddRef (LPUNKNOWN iface) {
  57         ICOM_THIS_MULTI(IDirectMusicCommandTrack, UnknownVtbl, iface);
  58         ULONG ref = InterlockedIncrement(&This->ref);
  59
  60         TRACE("(%p): AddRef from %d\n", This, ref - 1);
  61
  62         DMSTYLE_LockModule();
  63
  64         return ref;
  65 }
  66
  67 static ULONG WINAPI IDirectMusicCommandTrack_IUnknown_Release (LPUNKNOWN iface) {
  68         ICOM_THIS_MULTI(IDirectMusicCommandTrack, UnknownVtbl, iface);
  69         ULONG ref = InterlockedDecrement(&This->ref);
  70
  71         TRACE("(%p): ReleaseRef to %d\n", This, ref);
  72
  73         if (ref == 0) {
  74                 HeapFree(GetProcessHeap(), 0, This);
  75         }
  76
  77         DMSTYLE_UnlockModule();
  78
  79         return ref;
  80 }
  81
  82 static const IUnknownVtbl DirectMusicCommandTrack_Unknown_Vtbl = {
  83         IDirectMusicCommandTrack_IUnknown_QueryInterface,
  84         IDirectMusicCommandTrack_IUnknown_AddRef,
  85         IDirectMusicCommandTrack_IUnknown_Release
  86 };
  87
  88 /* IDirectMusicCommandTrack IDirectMusicTrack8 part: */
  89 static HRESULT WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_QueryInterface (LPDIRECTMUSICTRACK8 iface, REFIID riid, LPVOID *ppobj) {
  90         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
  91         return IDirectMusicCommandTrack_IUnknown_QueryInterface ((LPUNKNOWN)&This->UnknownVtbl, riid, ppobj);
  92 }
  93
  94 static ULONG WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_AddRef (LPDIRECTMUSICTRACK8 iface) {
  95         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
  96         return IDirectMusicCommandTrack_IUnknown_AddRef ((LPUNKNOWN)&This->UnknownVtbl);
  97 }
  98
  99 static ULONG WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_Release (LPDIRECTMUSICTRACK8 iface) {
 100         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
 101         return IDirectMusicCommandTrack_IUnknown_Release ((LPUNKNOWN)&This->UnknownVtbl);
 102 }
 103
 104 static HRESULT WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_Init (LPDIRECTMUSICTRACK8 iface, IDirectMusicSegment* pSegment)
 105 {
 106         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
 107         FIXME("(%p, %p): stub\n", This, pSegment);
 108         return S_OK;
 109 }
 110
 111 static HRESULT WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_InitPlay (LPDIRECTMUSICTRACK8 iface, IDirectMusicSegmentState* pSegmentState, IDirectMusicPerformance* pPerformance, void** ppStateData, DWORD dwVirtualTrack8ID, DWORD dwFlags)
 112 {
 113         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
 114         FIXME("(%p, %p, %p, %p, %d, %d): stub\n", This, pSegmentState, pPerformance, ppStateData, dwVirtualTrack8ID, dwFlags);
 115         return S_OK;
 116 }
 117
 118 static HRESULT WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_EndPlay (LPDIRECTMUSICTRACK8 iface, void* pStateData)
 119 {
 120         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
 121         FIXME("(%p, %p): stub\n", This, pStateData);
 122         return S_OK;
 123 }
 124
 125 static HRESULT WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_Play (LPDIRECTMUSICTRACK8 iface, void* pStateData, MUSIC_TIME mtStart, MUSIC_TIME mtEnd, MUSIC_TIME mtOffset, DWORD dwFlags, IDirectMusicPerformance* pPerf, IDirectMusicSegmentState* pSegSt, DWORD dwVirtualID)
 126 {
 127         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
 128         FIXME("(%p, %p, %d, %d, %d, %d, %p, %p, %d): stub\n", This, pStateData, mtStart, mtEnd, mtOffset, dwFlags, pPerf, pSegSt, dwVirtualID);
 129         return S_OK;
 130 }
 131
 132 static HRESULT WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_GetParam (LPDIRECTMUSICTRACK8 iface, REFGUID rguidType, MUSIC_TIME mtTime, MUSIC_TIME* pmtNext, void* pParam) {
 133         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
 134         FIXME("(%p, %s, %d, %p, %p): stub\n", This, debugstr_dmguid(rguidType), mtTime, pmtNext, pParam);
 135         return S_OK;
 136 }
 137
 138 static HRESULT WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_SetParam (LPDIRECTMUSICTRACK8 iface, REFGUID rguidType, MUSIC_TIME mtTime, void* pParam) {
 139         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
 140         FIXME("(%p, %s, %d, %p): stub\n", This, debugstr_dmguid(rguidType), mtTime, pParam);
 141         return S_OK;
 142 }
 143
 144 static HRESULT WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_IsParamSupported (LPDIRECTMUSICTRACK8 iface, REFGUID rguidType) {
 145         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
 146
 147         TRACE("(%p, %s)\n", This, debugstr_dmguid(rguidType));
 148         if (IsEqualGUID (rguidType, &GUID_CommandParam)
 149                 || IsEqualGUID (rguidType, &GUID_CommandParam2)
 150                 || IsEqualGUID (rguidType, &GUID_CommandParamNext)) {
 151                 TRACE("param supported\n");
 152                 return S_OK;
 153         }
 154
 155         TRACE("param unsupported\n");
 156         return DMUS_E_TYPE_UNSUPPORTED;
 157 }
 158
 159 static HRESULT WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_AddNotificationType (LPDIRECTMUSICTRACK8 iface, REFGUID rguidNotificationType) {
 160         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
 161         FIXME("(%p, %s): stub\n", This, debugstr_dmguid(rguidNotificationType));
 162         return S_OK;
 163 }
 164
 165 static HRESULT WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_RemoveNotificationType (LPDIRECTMUSICTRACK8 iface, REFGUID rguidNotificationType) {
 166         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
 167         FIXME("(%p, %s): stub\n", This, debugstr_dmguid(rguidNotificationType));
 168         return S_OK;
 169 }
 170
 171 static HRESULT WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_Clone (LPDIRECTMUSICTRACK8 iface, MUSIC_TIME mtStart, MUSIC_TIME mtEnd, IDirectMusicTrack** ppTrack) {
 172         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
 173         FIXME("(%p, %d, %d, %p): stub\n", This, mtStart, mtEnd, ppTrack);
 174         return S_OK;
 175 }
 176
 177 static HRESULT WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_PlayEx (LPDIRECTMUSICTRACK8 iface, void* pStateData, REFERENCE_TIME rtStart, REFERENCE_TIME rtEnd, REFERENCE_TIME rtOffset, DWORD dwFlags, IDirectMusicPerformance* pPerf, IDirectMusicSegmentState* pSegSt, DWORD dwVirtualID) {
 178         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
 179         FIXME("(%p, %p, 0x%s, 0x%s, 0x%s, %d, %p, %p, %d): stub\n", This, pStateData, wine_dbgstr_longlong(rtStart),
 180             wine_dbgstr_longlong(rtEnd), wine_dbgstr_longlong(rtOffset), dwFlags, pPerf, pSegSt, dwVirtualID);
 181         return S_OK;
 182 }
 183
 184 static HRESULT WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_GetParamEx (LPDIRECTMUSICTRACK8 iface, REFGUID rguidType, REFERENCE_TIME rtTime, REFERENCE_TIME* prtNext, void* pParam, void* pStateData, DWORD dwFlags) {
 185         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
 186         FIXME("(%p, %s, 0x%s, %p, %p, %p, %d): stub\n", This, debugstr_dmguid(rguidType),
 187             wine_dbgstr_longlong(rtTime), prtNext, pParam, pStateData, dwFlags);
 188         return S_OK;
 189 }
 190
 191 static HRESULT WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_SetParamEx (LPDIRECTMUSICTRACK8 iface, REFGUID rguidType, REFERENCE_TIME rtTime, void* pParam, void* pStateData, DWORD dwFlags) {
 192         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
 193         FIXME("(%p, %s, 0x%s, %p, %p, %d): stub\n", This, debugstr_dmguid(rguidType),
 194             wine_dbgstr_longlong(rtTime), pParam, pStateData, dwFlags);
 195         return S_OK;
 196 }
 197
 198 static HRESULT WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_Compose (LPDIRECTMUSICTRACK8 iface, IUnknown* pContext, DWORD dwTrackGroup, IDirectMusicTrack** ppResultTrack) {
 199         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
 200         FIXME("(%p, %p, %d, %p): stub\n", This, pContext, dwTrackGroup, ppResultTrack);
 201         return S_OK;
 202 }
 203
 204 static HRESULT WINAPI IDirectMusicCommandTrack_IDirectMusicTrack_Join (LPDIRECTMUSICTRACK8 iface, IDirectMusicTrack* pNewTrack, MUSIC_TIME mtJoin, IUnknown* pContext, DWORD dwTrackGroup, IDirectMusicTrack** ppResultTrack) {
 205         ICOM_THIS_MULTI(IDirectMusicCommandTrack, TrackVtbl, iface);
 206         FIXME("(%p, %p, %d, %p, %d, %p): stub\n", This, pNewTrack, mtJoin, pContext, dwTrackGroup, ppResultTrack);
 207         return S_OK;
 208 }
 209
 210 static const IDirectMusicTrack8Vtbl DirectMusicCommandTrack_Track_Vtbl = {
 211         IDirectMusicCommandTrack_IDirectMusicTrack_QueryInterface,
 212         IDirectMusicCommandTrack_IDirectMusicTrack_AddRef,
 213         IDirectMusicCommandTrack_IDirectMusicTrack_Release,
 214         IDirectMusicCommandTrack_IDirectMusicTrack_Init,
 215         IDirectMusicCommandTrack_IDirectMusicTrack_InitPlay,
 216         IDirectMusicCommandTrack_IDirectMusicTrack_EndPlay,
 217         IDirectMusicCommandTrack_IDirectMusicTrack_Play,
 218         IDirectMusicCommandTrack_IDirectMusicTrack_GetParam,
 219         IDirectMusicCommandTrack_IDirectMusicTrack_SetParam,
 220         IDirectMusicCommandTrack_IDirectMusicTrack_IsParamSupported,
 221         IDirectMusicCommandTrack_IDirectMusicTrack_AddNotificationType,
 222         IDirectMusicCommandTrack_IDirectMusicTrack_RemoveNotificationType,
 223         IDirectMusicCommandTrack_IDirectMusicTrack_Clone,
 224         IDirectMusicCommandTrack_IDirectMusicTrack_PlayEx,
 225         IDirectMusicCommandTrack_IDirectMusicTrack_GetParamEx,
 226         IDirectMusicCommandTrack_IDirectMusicTrack_SetParamEx,
 227         IDirectMusicCommandTrack_IDirectMusicTrack_Compose,
 228         IDirectMusicCommandTrack_IDirectMusicTrack_Join
 229 };
 230
 231 /* IDirectMusicCommandTrack IPersistStream part: */
 232 static HRESULT WINAPI IDirectMusicCommandTrack_IPersistStream_QueryInterface (LPPERSISTSTREAM iface, REFIID riid, LPVOID *ppobj) {
 233         ICOM_THIS_MULTI(IDirectMusicCommandTrack, PersistStreamVtbl, iface);
 234         return IDirectMusicCommandTrack_IUnknown_QueryInterface ((LPUNKNOWN)&This->UnknownVtbl, riid, ppobj);
 235 }
 236
 237 static ULONG WINAPI IDirectMusicCommandTrack_IPersistStream_AddRef (LPPERSISTSTREAM iface) {
 238         ICOM_THIS_MULTI(IDirectMusicCommandTrack, PersistStreamVtbl, iface);
 239         return IDirectMusicCommandTrack_IUnknown_AddRef ((LPUNKNOWN)&This->UnknownVtbl);
 240 }
 241
 242 static ULONG WINAPI IDirectMusicCommandTrack_IPersistStream_Release (LPPERSISTSTREAM iface) {
 243         ICOM_THIS_MULTI(IDirectMusicCommandTrack, PersistStreamVtbl, iface);
 244         return IDirectMusicCommandTrack_IUnknown_Release ((LPUNKNOWN)&This->UnknownVtbl);
 245 }
 246
 247 static HRESULT WINAPI IDirectMusicCommandTrack_IPersistStream_GetClassID (LPPERSISTSTREAM iface, CLSID* pClassID) {
 248         return E_NOTIMPL;
 249 }
 250
 251 static HRESULT WINAPI IDirectMusicCommandTrack_IPersistStream_IsDirty (LPPERSISTSTREAM iface) {
 252         return E_NOTIMPL;
 253 }
 254
 255 static HRESULT WINAPI IDirectMusicCommandTrack_IPersistStream_Load (LPPERSISTSTREAM iface, IStream* pStm) {
 256         ICOM_THIS_MULTI(IDirectMusicCommandTrack, PersistStreamVtbl, iface);
 257         FOURCC chunkID;
 258         DWORD chunkSize, dwSizeOfStruct, nrCommands;
 259         LARGE_INTEGER liMove; /* used when skipping chunks */
 260
 261         IStream_Read (pStm, &chunkID, sizeof(FOURCC), NULL);
 262         IStream_Read (pStm, &chunkSize, sizeof(DWORD), NULL);
 263         TRACE_(dmfile)(": %s chunk (size = %d)", debugstr_fourcc (chunkID), chunkSize);
 264         switch (chunkID) {
 265                 case DMUS_FOURCC_COMMANDTRACK_CHUNK: {
 266                         int count;
 267                         TRACE_(dmfile)(": command track chunk\n");
 268                         IStream_Read (pStm, &dwSizeOfStruct, sizeof(DWORD), NULL);
 269                         if (dwSizeOfStruct != sizeof(DMUS_IO_COMMAND)) {
 270                                 TRACE_(dmfile)(": declared size of struct (=%d) != actual size; indicates older direct music version\n", dwSizeOfStruct);
 271                         }
 272                         chunkSize -= sizeof(DWORD); /* now chunk size is one DWORD shorter */
 273                         nrCommands = chunkSize/dwSizeOfStruct; /* and this is the number of commands */
 274                         /* load each command separately in new entry */
 275                         for (count = 0; count < nrCommands; count++) {
 276                                 LPDMUS_PRIVATE_COMMAND pNewCommand = HeapAlloc (GetProcessHeap (), HEAP_ZERO_MEMORY, sizeof(DMUS_PRIVATE_COMMAND));
 277                                 IStream_Read (pStm, &pNewCommand->pCommand, dwSizeOfStruct, NULL);
 278                                 list_add_tail (&This->Commands, &pNewCommand->entry);
 279                         }
 280                         TRACE_(dmfile)(": reading finished\n");
 281                         This->pDesc->dwValidData |= DMUS_OBJ_LOADED;
 282                         break;
 283                 }
 284                 default: {
 285                         TRACE_(dmfile)(": unexpected chunk; loading failed)\n");
 286                         liMove.QuadPart = chunkSize;
 287                         IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL); /* skip the rest of the chunk */
 288                         return E_FAIL;
 289                 }
 290         }
 291
 292         /* DEBUG: dumps whole band track object tree: */
 293         if (TRACE_ON(dmstyle)) {
 294                 int r = 0;
 295                 DMUS_PRIVATE_COMMAND *tmpEntry;
 296                 struct list *listEntry;
 297                 TRACE("*** IDirectMusicCommandTrack (%p) ***\n", This->TrackVtbl);
 298                 TRACE(" - Commands:\n");
 299                 LIST_FOR_EACH (listEntry, &This->Commands) {
 300                         tmpEntry = LIST_ENTRY (listEntry, DMUS_PRIVATE_COMMAND, entry);
 301                         TRACE("    - Command[%i]:\n", r);
 302                         TRACE("       - mtTime = %i\n", tmpEntry->pCommand.mtTime);
 303                         TRACE("       - wMeasure = %d\n", tmpEntry->pCommand.wMeasure);
 304                         TRACE("       - bBeat = %i\n", tmpEntry->pCommand.bBeat);
 305                         TRACE("       - bCommand = %i\n", tmpEntry->pCommand.bCommand);
 306                         TRACE("       - bGrooveLevel = %i\n", tmpEntry->pCommand.bGrooveLevel);
 307                         TRACE("       - bGrooveRange = %i\n", tmpEntry->pCommand.bGrooveRange);
 308                         TRACE("       - bRepeatMode = %i\n", tmpEntry->pCommand.bRepeatMode);
 309                         r++;
 310                 }
 311         }
 312
 313         return S_OK;
 314 }
 315
 316 static HRESULT WINAPI IDirectMusicCommandTrack_IPersistStream_Save (LPPERSISTSTREAM iface, IStream* pStm, BOOL fClearDirty) {
 317         return E_NOTIMPL;
 318 }
 319
 320 static HRESULT WINAPI IDirectMusicCommandTrack_IPersistStream_GetSizeMax (LPPERSISTSTREAM iface, ULARGE_INTEGER* pcbSize) {
 321         return E_NOTIMPL;
 322 }
 323
 324 static const IPersistStreamVtbl DirectMusicCommandTrack_PersistStream_Vtbl = {
 325         IDirectMusicCommandTrack_IPersistStream_QueryInterface,
 326         IDirectMusicCommandTrack_IPersistStream_AddRef,
 327         IDirectMusicCommandTrack_IPersistStream_Release,
 328         IDirectMusicCommandTrack_IPersistStream_GetClassID,
 329         IDirectMusicCommandTrack_IPersistStream_IsDirty,
 330         IDirectMusicCommandTrack_IPersistStream_Load,
 331         IDirectMusicCommandTrack_IPersistStream_Save,
 332         IDirectMusicCommandTrack_IPersistStream_GetSizeMax
 333 };
 334
 335 /* for ClassFactory */
 336 HRESULT WINAPI DMUSIC_CreateDirectMusicCommandTrack (LPCGUID lpcGUID, LPVOID *ppobj, LPUNKNOWN pUnkOuter) {
 337         IDirectMusicCommandTrack* track;
 338
 339         track = HeapAlloc (GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IDirectMusicCommandTrack));
 340         if (NULL == track) {
 341                 *ppobj = NULL;
 342                 return E_OUTOFMEMORY;
 343         }
 344         track->UnknownVtbl = &DirectMusicCommandTrack_Unknown_Vtbl;
 345         track->TrackVtbl = &DirectMusicCommandTrack_Track_Vtbl;
 346         track->PersistStreamVtbl = &DirectMusicCommandTrack_PersistStream_Vtbl;
 347         track->pDesc = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(DMUS_OBJECTDESC));
 348         DM_STRUCT_INIT(track->pDesc);
 349         track->pDesc->dwValidData |= DMUS_OBJ_CLASS;
 350         track->pDesc->guidClass = CLSID_DirectMusicCommandTrack;
 351         track->ref = 0; /* will be inited by QueryInterface */
 352         list_init (&track->Commands);
 353
 354         return IDirectMusicCommandTrack_IUnknown_QueryInterface ((LPUNKNOWN)&track->UnknownVtbl, lpcGUID, ppobj);
 355 }