dlls/dmband/band.c

   1 /* IDirectMusicBand 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 "dmband_private.h"
  21 #include "dmobject.h"
  22
  23 WINE_DEFAULT_DEBUG_CHANNEL(dmband);
  24 WINE_DECLARE_DEBUG_CHANNEL(dmfile);
  25
  26
  27 /*****************************************************************************
  28  * IDirectMusicBandImpl implementation
  29  */
  30 typedef struct IDirectMusicBandImpl {
  31     IDirectMusicBand IDirectMusicBand_iface;
  32     struct dmobject dmobj;
  33     LONG ref;
  34     struct list Instruments;
  35 } IDirectMusicBandImpl;
  36
  37 static inline IDirectMusicBandImpl *impl_from_IDirectMusicBand(IDirectMusicBand *iface)
  38 {
  39     return CONTAINING_RECORD(iface, IDirectMusicBandImpl, IDirectMusicBand_iface);
  40 }
  41
  42 /* DirectMusicBandImpl IDirectMusicBand part: */
  43 static HRESULT WINAPI IDirectMusicBandImpl_QueryInterface(IDirectMusicBand *iface, REFIID riid,
  44         void **ret_iface)
  45 {
  46     IDirectMusicBandImpl *This = impl_from_IDirectMusicBand(iface);
  47
  48     TRACE("(%p, %s, %p)\n", This, debugstr_dmguid(riid), ret_iface);
  49
  50     *ret_iface = NULL;
  51
  52     if (IsEqualIID(riid, &IID_IUnknown) || IsEqualIID(riid, &IID_IDirectMusicBand))
  53         *ret_iface = iface;
  54     else if (IsEqualIID(riid, &IID_IDirectMusicObject))
  55         *ret_iface = &This->dmobj.IDirectMusicObject_iface;
  56     else if (IsEqualIID(riid, &IID_IPersistStream))
  57         *ret_iface = &This->dmobj.IPersistStream_iface;
  58     else {
  59         WARN("(%p, %s, %p): not found\n", This, debugstr_dmguid(riid), ret_iface);
  60         return E_NOINTERFACE;
  61     }
  62
  63     IDirectMusicBand_AddRef((IUnknown*)*ret_iface);
  64     return S_OK;
  65 }
  66
  67 static ULONG WINAPI IDirectMusicBandImpl_AddRef(IDirectMusicBand *iface)
  68 {
  69     IDirectMusicBandImpl *This = impl_from_IDirectMusicBand(iface);
  70     LONG ref = InterlockedIncrement(&This->ref);
  71
  72     TRACE("(%p) ref=%d\n", This, ref);
  73
  74     return ref;
  75 }
  76
  77 static ULONG WINAPI IDirectMusicBandImpl_Release(IDirectMusicBand *iface)
  78 {
  79     IDirectMusicBandImpl *This = impl_from_IDirectMusicBand(iface);
  80     LONG ref = InterlockedDecrement(&This->ref);
  81
  82     TRACE("(%p) ref=%d\n", This, ref);
  83
  84     if (!ref) {
  85         HeapFree(GetProcessHeap(), 0, This);
  86         DMBAND_UnlockModule();
  87     }
  88
  89     return ref;
  90 }
  91
  92 static HRESULT WINAPI IDirectMusicBandImpl_CreateSegment(IDirectMusicBand *iface,
  93         IDirectMusicSegment **segment)
  94 {
  95     IDirectMusicBandImpl *This = impl_from_IDirectMusicBand(iface);
  96     HRESULT hr;
  97     DMUS_BAND_PARAM bandparam;
  98
  99     FIXME("(%p, %p): semi-stub\n", This, segment);
 100
 101     hr = CoCreateInstance(&CLSID_DirectMusicSegment, NULL, CLSCTX_INPROC,
 102             &IID_IDirectMusicSegment, (void**)segment);
 103     if (FAILED(hr))
 104         return hr;
 105
 106     bandparam.mtTimePhysical = 0;
 107     bandparam.pBand = &This->IDirectMusicBand_iface;
 108     IDirectMusicBand_AddRef(bandparam.pBand);
 109     hr = IDirectMusicSegment_SetParam(*segment, &GUID_BandParam, 0xffffffff, DMUS_SEG_ALLTRACKS,
 110             0, &bandparam);
 111     IDirectMusicBand_Release(bandparam.pBand);
 112
 113     return hr;
 114 }
 115
 116 static HRESULT WINAPI IDirectMusicBandImpl_Download(IDirectMusicBand *iface,
 117         IDirectMusicPerformance *pPerformance)
 118 {
 119         IDirectMusicBandImpl *This = impl_from_IDirectMusicBand(iface);
 120         FIXME("(%p, %p): stub\n", This, pPerformance);
 121         return S_OK;
 122 }
 123
 124 static HRESULT WINAPI IDirectMusicBandImpl_Unload(IDirectMusicBand *iface,
 125         IDirectMusicPerformance *pPerformance)
 126 {
 127         IDirectMusicBandImpl *This = impl_from_IDirectMusicBand(iface);
 128         FIXME("(%p, %p): stub\n", This, pPerformance);
 129         return S_OK;
 130 }
 131
 132 static const IDirectMusicBandVtbl dmband_vtbl = {
 133     IDirectMusicBandImpl_QueryInterface,
 134     IDirectMusicBandImpl_AddRef,
 135     IDirectMusicBandImpl_Release,
 136     IDirectMusicBandImpl_CreateSegment,
 137     IDirectMusicBandImpl_Download,
 138     IDirectMusicBandImpl_Unload
 139 };
 140
 141 /* IDirectMusicBandImpl IDirectMusicObject part: */
 142 static HRESULT WINAPI band_IDirectMusicObject_ParseDescriptor(IDirectMusicObject *iface,
 143         IStream *stream, DMUS_OBJECTDESC *desc)
 144 {
 145     struct chunk_entry riff = {0};
 146     STATSTG stat;
 147     HRESULT hr;
 148
 149     TRACE("(%p, %p, %p)\n", iface, stream, desc);
 150
 151     if (!stream || !desc)
 152         return E_POINTER;
 153
 154     if ((hr = stream_get_chunk(stream, &riff)) != S_OK)
 155         return hr;
 156     if (riff.id != FOURCC_RIFF || riff.type != DMUS_FOURCC_BAND_FORM) {
 157         TRACE("loading failed: unexpected %s\n", debugstr_chunk(&riff));
 158         stream_skip_chunk(stream, &riff);
 159         return DMUS_E_INVALID_BAND;
 160     }
 161
 162     hr = dmobj_parsedescriptor(stream, &riff, desc,
 163             DMUS_OBJ_OBJECT|DMUS_OBJ_NAME|DMUS_OBJ_NAME_INAM|DMUS_OBJ_CATEGORY|DMUS_OBJ_VERSION);
 164     if (FAILED(hr))
 165         return hr;
 166
 167     desc->guidClass = CLSID_DirectMusicBand;
 168     desc->dwValidData |= DMUS_OBJ_CLASS;
 169
 170     if (desc->dwValidData & DMUS_OBJ_CATEGORY) {
 171         IStream_Stat(stream, &stat, STATFLAG_NONAME);
 172         desc->ftDate = stat.mtime;
 173         desc->dwValidData |= DMUS_OBJ_DATE;
 174     }
 175
 176     TRACE("returning descriptor:\n");
 177     dump_DMUS_OBJECTDESC(desc);
 178     return S_OK;
 179 }
 180
 181 static const IDirectMusicObjectVtbl dmobject_vtbl = {
 182     dmobj_IDirectMusicObject_QueryInterface,
 183     dmobj_IDirectMusicObject_AddRef,
 184     dmobj_IDirectMusicObject_Release,
 185     dmobj_IDirectMusicObject_GetDescriptor,
 186     dmobj_IDirectMusicObject_SetDescriptor,
 187     band_IDirectMusicObject_ParseDescriptor
 188 };
 189
 190 #define DMUS_IO_INSTRUMENT_DX7_SIZE offsetof(DMUS_IO_INSTRUMENT, nPitchBendRange)
 191
 192 /* IDirectMusicBandImpl IPersistStream part: */
 193 static HRESULT parse_instrument(IDirectMusicBandImpl *This, DMUS_PRIVATE_CHUNK *pChunk,
 194         IStream *pStm)
 195 {
 196   DMUS_PRIVATE_CHUNK Chunk;
 197   DWORD ListSize[3], ListCount[3];
 198   LARGE_INTEGER liMove; /* used when skipping chunks */
 199   HRESULT hr;
 200
 201   DMUS_IO_INSTRUMENT inst;
 202   LPDMUS_PRIVATE_INSTRUMENT pNewInstrument;
 203   IDirectMusicObject* pObject = NULL;
 204
 205   if (pChunk->fccID != DMUS_FOURCC_INSTRUMENT_LIST) {
 206     ERR_(dmfile)(": %s chunk should be an INSTRUMENT list\n", debugstr_fourcc (pChunk->fccID));
 207     return E_FAIL;
 208   }
 209
 210   ListSize[0] = pChunk->dwSize - sizeof(FOURCC);
 211   ListCount[0] = 0;
 212
 213   do {
 214     IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
 215     ListCount[0] += sizeof(FOURCC) + sizeof(DWORD) + Chunk.dwSize;
 216     TRACE_(dmfile)(": %s chunk (size = %d)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
 217     switch (Chunk.fccID) {
 218     case DMUS_FOURCC_INSTRUMENT_CHUNK: {
 219       TRACE_(dmfile)(": Instrument chunk\n");
 220       if (Chunk.dwSize != sizeof(DMUS_IO_INSTRUMENT) && Chunk.dwSize != DMUS_IO_INSTRUMENT_DX7_SIZE) {
 221         ERR_(dmfile)("unexpected size %d\n", Chunk.dwSize);
 222         return E_FAIL;
 223       }
 224       IStream_Read (pStm, &inst, Chunk.dwSize, NULL);
 225       if (Chunk.dwSize != sizeof(DMUS_IO_INSTRUMENT))
 226         inst.nPitchBendRange = 0;
 227
 228       TRACE_(dmfile)(" - dwPatch: %u\n", inst.dwPatch);
 229       TRACE_(dmfile)(" - dwAssignPatch: %u\n", inst.dwAssignPatch);
 230       TRACE_(dmfile)(" - dwNoteRanges[0]: %u\n", inst.dwNoteRanges[0]);
 231       TRACE_(dmfile)(" - dwNoteRanges[1]: %u\n", inst.dwNoteRanges[1]);
 232       TRACE_(dmfile)(" - dwNoteRanges[2]: %u\n", inst.dwNoteRanges[2]);
 233       TRACE_(dmfile)(" - dwNoteRanges[3]: %u\n", inst.dwNoteRanges[3]);
 234       TRACE_(dmfile)(" - dwPChannel: %u\n", inst.dwPChannel);
 235       TRACE_(dmfile)(" - dwFlags: %x\n", inst.dwFlags);
 236       TRACE_(dmfile)(" - bPan: %u\n", inst.bPan);
 237       TRACE_(dmfile)(" - bVolume: %u\n", inst.bVolume);
 238       TRACE_(dmfile)(" - nTranspose: %d\n", inst.nTranspose);
 239       TRACE_(dmfile)(" - dwChannelPriority: %u\n", inst.dwChannelPriority);
 240       TRACE_(dmfile)(" - nPitchBendRange: %d\n", inst.nPitchBendRange);
 241       break;
 242     }
 243     case FOURCC_LIST: {
 244       IStream_Read (pStm, &Chunk.fccID, sizeof(FOURCC), NULL);
 245       TRACE_(dmfile)(": LIST chunk of type %s", debugstr_fourcc(Chunk.fccID));
 246       ListSize[1] = Chunk.dwSize - sizeof(FOURCC);
 247       ListCount[1] = 0;
 248       switch (Chunk.fccID) {
 249       case DMUS_FOURCC_REF_LIST: {
 250         FIXME_(dmfile)(": DMRF (DM References) list\n");
 251         hr = IDirectMusicUtils_IPersistStream_ParseReference(&This->dmobj.IPersistStream_iface,
 252                 &Chunk, pStm, &pObject);
 253         if (FAILED(hr)) {
 254           ERR(": could not load Reference\n");
 255           return hr;
 256         }
 257         break;
 258       }
 259       default: {
 260         TRACE_(dmfile)(": unknown (skipping)\n");
 261         liMove.QuadPart = Chunk.dwSize - sizeof(FOURCC);
 262         IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
 263         break;
 264       }
 265       }
 266       break;
 267     }
 268     default: {
 269       TRACE_(dmfile)(": unknown chunk (irrelevant & skipping)\n");
 270       liMove.QuadPart = Chunk.dwSize;
 271       IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
 272       break;
 273     }
 274     }
 275     TRACE_(dmfile)(": ListCount[0] = %d < ListSize[0] = %d\n", ListCount[0], ListSize[0]);
 276   } while (ListCount[0] < ListSize[0]);
 277
 278   /*
 279    * @TODO insert pNewInstrument into This
 280    */
 281   pNewInstrument = HeapAlloc (GetProcessHeap (), HEAP_ZERO_MEMORY, sizeof(DMUS_PRIVATE_INSTRUMENT));
 282   if (NULL == pNewInstrument) {
 283     ERR(": no more memory\n");
 284     return  E_OUTOFMEMORY;
 285   }
 286   memcpy(&pNewInstrument->pInstrument, &inst, sizeof(DMUS_IO_INSTRUMENT));
 287   pNewInstrument->ppReferenceCollection = NULL;
 288   if (NULL != pObject) {
 289     IDirectMusicCollection* pCol = NULL;
 290     hr = IDirectMusicObject_QueryInterface (pObject, &IID_IDirectMusicCollection, (void**) &pCol);
 291     if (FAILED(hr)) {
 292       ERR(": failed to get IDirectMusicCollection Interface from DMObject\n");
 293       HeapFree(GetProcessHeap(), 0, pNewInstrument);
 294
 295       return hr;
 296     }
 297     pNewInstrument->ppReferenceCollection = pCol;
 298     IDirectMusicObject_Release(pObject);
 299   }
 300   list_add_tail (&This->Instruments, &pNewInstrument->entry);
 301
 302   return S_OK;
 303 }
 304
 305 static HRESULT parse_instruments_list(IDirectMusicBandImpl *This, DMUS_PRIVATE_CHUNK *pChunk,
 306         IStream *pStm)
 307 {
 308   HRESULT hr;
 309   DMUS_PRIVATE_CHUNK Chunk;
 310   DWORD ListSize[3], ListCount[3];
 311   LARGE_INTEGER liMove; /* used when skipping chunks */
 312
 313   if (pChunk->fccID != DMUS_FOURCC_INSTRUMENTS_LIST) {
 314     ERR_(dmfile)(": %s chunk should be an INSTRUMENTS list\n", debugstr_fourcc (pChunk->fccID));
 315     return E_FAIL;
 316   }
 317
 318   ListSize[0] = pChunk->dwSize - sizeof(FOURCC);
 319   ListCount[0] = 0;
 320
 321   do {
 322     IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
 323     ListCount[0] += sizeof(FOURCC) + sizeof(DWORD) + Chunk.dwSize;
 324     TRACE_(dmfile)(": %s chunk (size = %d)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
 325     switch (Chunk.fccID) {
 326     case FOURCC_LIST: {
 327       IStream_Read (pStm, &Chunk.fccID, sizeof(FOURCC), NULL);
 328       TRACE_(dmfile)(": LIST chunk of type %s", debugstr_fourcc(Chunk.fccID));
 329       ListSize[1] = Chunk.dwSize - sizeof(FOURCC);
 330       ListCount[1] = 0;
 331       switch (Chunk.fccID) {
 332       case DMUS_FOURCC_INSTRUMENT_LIST: {
 333         TRACE_(dmfile)(": Instrument list\n");
 334         hr = parse_instrument(This, &Chunk, pStm);
 335         if (FAILED(hr)) return hr;
 336         break;
 337       }
 338       default: {
 339         TRACE_(dmfile)(": unknown chunk (irrelevant & skipping)\n");
 340         liMove.QuadPart = ListSize[1];
 341         IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
 342         break;
 343       }
 344       }
 345       break;
 346     }
 347     default: {
 348       TRACE_(dmfile)(": unknown chunk (irrelevant & skipping)\n");
 349       liMove.QuadPart = Chunk.dwSize;
 350       IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
 351       break;
 352     }
 353     }
 354     TRACE_(dmfile)(": ListCount[0] = %d < ListSize[0] = %d\n", ListCount[0], ListSize[0]);
 355   } while (ListCount[0] < ListSize[0]);
 356
 357   return S_OK;
 358 }
 359
 360 static HRESULT parse_band_form(IDirectMusicBandImpl *This, DMUS_PRIVATE_CHUNK *pChunk,
 361         IStream *pStm)
 362 {
 363   HRESULT hr = E_FAIL;
 364   DMUS_PRIVATE_CHUNK Chunk;
 365   DWORD StreamSize, StreamCount, ListSize[3], ListCount[3];
 366   LARGE_INTEGER liMove; /* used when skipping chunks */
 367
 368   GUID tmp_guid;
 369
 370   if (pChunk->fccID != DMUS_FOURCC_BAND_FORM) {
 371     ERR_(dmfile)(": %s chunk should be a BAND form\n", debugstr_fourcc (pChunk->fccID));
 372     return E_FAIL;
 373   }
 374
 375   StreamSize = pChunk->dwSize - sizeof(FOURCC);
 376   StreamCount = 0;
 377
 378   do {
 379     IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
 380     StreamCount += sizeof(FOURCC) + sizeof(DWORD) + Chunk.dwSize;
 381     TRACE_(dmfile)(": %s chunk (size = %d)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
 382
 383     hr = IDirectMusicUtils_IPersistStream_ParseDescGeneric(&Chunk, pStm, &This->dmobj.desc);
 384     if (FAILED(hr)) return hr;
 385
 386     if (hr == S_FALSE) {
 387       switch (Chunk.fccID) {
 388       case DMUS_FOURCC_GUID_CHUNK: {
 389         TRACE_(dmfile)(": GUID\n");
 390         IStream_Read (pStm, &tmp_guid, sizeof(GUID), NULL);
 391         TRACE_(dmfile)(" - guid: %s\n", debugstr_dmguid(&tmp_guid));
 392         break;
 393       }
 394       case FOURCC_LIST: {
 395         IStream_Read (pStm, &Chunk.fccID, sizeof(FOURCC), NULL);
 396         TRACE_(dmfile)(": LIST chunk of type %s", debugstr_fourcc(Chunk.fccID));
 397         ListSize[0] = Chunk.dwSize - sizeof(FOURCC);
 398         ListCount[0] = 0;
 399         switch (Chunk.fccID) {
 400         case DMUS_FOURCC_UNFO_LIST: {
 401           TRACE_(dmfile)(": UNFO list\n");
 402           do {
 403             IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
 404             ListCount[0] += sizeof(FOURCC) + sizeof(DWORD) + Chunk.dwSize;
 405             TRACE_(dmfile)(": %s chunk (size = %d)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
 406
 407             hr = IDirectMusicUtils_IPersistStream_ParseUNFOGeneric(&Chunk, pStm, &This->dmobj.desc);
 408             if (FAILED(hr)) return hr;
 409
 410             if (hr == S_FALSE) {
 411               switch (Chunk.fccID) {
 412               default: {
 413                 TRACE_(dmfile)(": unknown chunk (irrelevant & skipping)\n");
 414                 liMove.QuadPart = Chunk.dwSize;
 415                 IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
 416                 break;
 417               }
 418               }
 419             }
 420             TRACE_(dmfile)(": ListCount[0] = %d < ListSize[0] = %d\n", ListCount[0], ListSize[0]);
 421           } while (ListCount[0] < ListSize[0]);
 422           break;
 423         }
 424         case DMUS_FOURCC_INSTRUMENTS_LIST: {
 425           TRACE_(dmfile)(": INSTRUMENTS list\n");
 426           hr = parse_instruments_list(This, &Chunk, pStm);
 427           if (FAILED(hr)) return hr;
 428           break;
 429         }
 430         default: {
 431           TRACE_(dmfile)(": unknown (skipping)\n");
 432           liMove.QuadPart = Chunk.dwSize - sizeof(FOURCC);
 433           IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
 434           break;
 435         }
 436         }
 437         break;
 438       }
 439       default: {
 440         TRACE_(dmfile)(": unknown chunk (irrelevant & skipping)\n");
 441         liMove.QuadPart = Chunk.dwSize;
 442         IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
 443         break;
 444       }
 445       }
 446     }
 447     TRACE_(dmfile)(": StreamCount[0] = %d < StreamSize[0] = %d\n", StreamCount, StreamSize);
 448   } while (StreamCount < StreamSize);
 449
 450   return S_OK;
 451 }
 452
 453 static inline IDirectMusicBandImpl *impl_from_IPersistStream(IPersistStream *iface)
 454 {
 455     return CONTAINING_RECORD(iface, IDirectMusicBandImpl, dmobj.IPersistStream_iface);
 456 }
 457
 458 static HRESULT WINAPI IPersistStreamImpl_Load(IPersistStream *iface, IStream *pStm)
 459 {
 460   IDirectMusicBandImpl *This = impl_from_IPersistStream(iface);
 461   DMUS_PRIVATE_CHUNK Chunk;
 462   LARGE_INTEGER liMove;
 463   HRESULT hr;
 464
 465   TRACE("(%p,%p): loading\n", This, pStm);
 466
 467   IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
 468   TRACE_(dmfile)(": %s chunk (size = %d)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
 469   switch (Chunk.fccID) {
 470   case FOURCC_RIFF: {
 471     IStream_Read (pStm, &Chunk.fccID, sizeof(FOURCC), NULL);
 472     TRACE_(dmfile)(": %s chunk (size = %d)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
 473     switch (Chunk.fccID) {
 474     case DMUS_FOURCC_BAND_FORM: {
 475       TRACE_(dmfile)(": Band form\n");
 476       hr = parse_band_form(This, &Chunk, pStm);
 477       if (FAILED(hr)) return hr;
 478       break;
 479     }
 480     default: {
 481       TRACE_(dmfile)(": unexpected chunk; loading failed)\n");
 482       liMove.QuadPart = Chunk.dwSize;
 483       IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL);
 484       return E_FAIL;
 485     }
 486     }
 487     TRACE_(dmfile)(": reading finished\n");
 488     break;
 489   }
 490   default: {
 491     TRACE_(dmfile)(": unexpected chunk; loading failed)\n");
 492     liMove.QuadPart = Chunk.dwSize;
 493     IStream_Seek (pStm, liMove, STREAM_SEEK_CUR, NULL); /* skip the rest of the chunk */
 494     return E_FAIL;
 495   }
 496   }
 497
 498   return S_OK;
 499 }
 500
 501 static const IPersistStreamVtbl persiststream_vtbl = {
 502     dmobj_IPersistStream_QueryInterface,
 503     dmobj_IPersistStream_AddRef,
 504     dmobj_IPersistStream_Release,
 505     unimpl_IPersistStream_GetClassID,
 506     unimpl_IPersistStream_IsDirty,
 507     IPersistStreamImpl_Load,
 508     unimpl_IPersistStream_Save,
 509     unimpl_IPersistStream_GetSizeMax
 510 };
 511
 512 /* for ClassFactory */
 513 HRESULT WINAPI create_dmband(REFIID lpcGUID, void **ppobj)
 514 {
 515   IDirectMusicBandImpl* obj;
 516   HRESULT hr;
 517
 518   obj = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IDirectMusicBandImpl));
 519   if (NULL == obj) {
 520     *ppobj = NULL;
 521     return E_OUTOFMEMORY;
 522   }
 523   obj->IDirectMusicBand_iface.lpVtbl = &dmband_vtbl;
 524   obj->ref = 1;
 525   dmobject_init(&obj->dmobj, &CLSID_DirectMusicBand, (IUnknown *)&obj->IDirectMusicBand_iface);
 526   obj->dmobj.IDirectMusicObject_iface.lpVtbl = &dmobject_vtbl;
 527   obj->dmobj.IPersistStream_iface.lpVtbl = &persiststream_vtbl;
 528   list_init (&obj->Instruments);
 529
 530   DMBAND_LockModule();
 531   hr = IDirectMusicBand_QueryInterface(&obj->IDirectMusicBand_iface, lpcGUID, ppobj);
 532   IDirectMusicBand_Release(&obj->IDirectMusicBand_iface);
 533
 534   return hr;
 535 }