wine/dlls/dmusic/collection.c
Michael Stefaniuc 25c41c4eea dmusic: Use dump_DMUS_OBJECTDESC() instead of open coding it.
Signed-off-by: Michael Stefaniuc <mstefani@winehq.org>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
2019-03-25 10:12:22 +01:00

557 lines
27 KiB
C

/*
* IDirectMusicCollection 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 "dmusic_private.h"
#include "dmobject.h"
WINE_DEFAULT_DEBUG_CHANNEL(dmusic);
WINE_DECLARE_DEBUG_CHANNEL(dmfile);
/*****************************************************************************
* IDirectMusicCollectionImpl implementation
*/
typedef struct IDirectMusicCollectionImpl {
IDirectMusicCollection IDirectMusicCollection_iface;
struct dmobject dmobj;
LONG ref;
/* IDirectMusicCollectionImpl fields */
IStream *pStm; /* stream from which we load collection and later instruments */
LARGE_INTEGER liCollectionPosition; /* offset in a stream where collection was loaded from */
LARGE_INTEGER liWavePoolTablePosition; /* offset in a stream where wave pool table can be found */
CHAR *szCopyright; /* FIXME: should probably be placed somewhere else */
DLSHEADER *pHeader;
/* pool table */
POOLTABLE *pPoolTable;
POOLCUE *pPoolCues;
/* instruments */
struct list Instruments;
} IDirectMusicCollectionImpl;
static inline IDirectMusicCollectionImpl *impl_from_IDirectMusicCollection(IDirectMusicCollection *iface)
{
return CONTAINING_RECORD(iface, IDirectMusicCollectionImpl, IDirectMusicCollection_iface);
}
static inline struct dmobject *impl_from_IDirectMusicObject(IDirectMusicObject *iface)
{
return CONTAINING_RECORD(iface, struct dmobject, IDirectMusicObject_iface);
}
static inline IDirectMusicCollectionImpl *impl_from_IPersistStream(IPersistStream *iface)
{
return CONTAINING_RECORD(iface, IDirectMusicCollectionImpl, dmobj.IPersistStream_iface);
}
/* IDirectMusicCollectionImpl IUnknown part: */
static HRESULT WINAPI IDirectMusicCollectionImpl_QueryInterface(IDirectMusicCollection *iface,
REFIID riid, void **ret_iface)
{
IDirectMusicCollectionImpl *This = impl_from_IDirectMusicCollection(iface);
TRACE("(%p/%p)->(%s, %p)\n", iface, This, debugstr_dmguid(riid), ret_iface);
*ret_iface = NULL;
if (IsEqualIID(riid, &IID_IUnknown) || IsEqualIID(riid, &IID_IDirectMusicCollection))
*ret_iface = iface;
else if (IsEqualIID(riid, &IID_IDirectMusicObject))
*ret_iface = &This->dmobj.IDirectMusicObject_iface;
else if (IsEqualIID(riid, &IID_IPersistStream))
*ret_iface = &This->dmobj.IPersistStream_iface;
else
{
WARN("(%p/%p)->(%s, %p): not found\n", iface, This, debugstr_dmguid(riid), ret_iface);
return E_NOINTERFACE;
}
IUnknown_AddRef((IUnknown*)*ret_iface);
return S_OK;
}
static ULONG WINAPI IDirectMusicCollectionImpl_AddRef(IDirectMusicCollection *iface)
{
IDirectMusicCollectionImpl *This = impl_from_IDirectMusicCollection(iface);
ULONG ref = InterlockedIncrement(&This->ref);
TRACE("(%p/%p)->(): new ref = %u\n", iface, This, ref);
return ref;
}
static ULONG WINAPI IDirectMusicCollectionImpl_Release(IDirectMusicCollection *iface)
{
IDirectMusicCollectionImpl *This = impl_from_IDirectMusicCollection(iface);
ULONG ref = InterlockedDecrement(&This->ref);
TRACE("(%p/%p)->(): new ref = %u\n", iface, This, ref);
if (!ref) {
HeapFree(GetProcessHeap(), 0, This);
DMUSIC_UnlockModule();
}
return ref;
}
/* IDirectMusicCollection Interface follows: */
static HRESULT WINAPI IDirectMusicCollectionImpl_GetInstrument(IDirectMusicCollection *iface,
DWORD patch, IDirectMusicInstrument **instrument)
{
IDirectMusicCollectionImpl *This = impl_from_IDirectMusicCollection(iface);
DMUS_PRIVATE_INSTRUMENTENTRY *inst_entry;
struct list *list_entry;
DWORD inst_patch;
TRACE("(%p/%p)->(%u, %p)\n", iface, This, patch, instrument);
LIST_FOR_EACH(list_entry, &This->Instruments) {
inst_entry = LIST_ENTRY(list_entry, DMUS_PRIVATE_INSTRUMENTENTRY, entry);
IDirectMusicInstrument_GetPatch(inst_entry->pInstrument, &inst_patch);
if (patch == inst_patch) {
*instrument = inst_entry->pInstrument;
IDirectMusicInstrument_AddRef(inst_entry->pInstrument);
IDirectMusicInstrumentImpl_CustomLoad(inst_entry->pInstrument, This->pStm);
TRACE(": returning instrument %p\n", *instrument);
return S_OK;
}
}
TRACE(": instrument not found\n");
return DMUS_E_INVALIDPATCH;
}
static HRESULT WINAPI IDirectMusicCollectionImpl_EnumInstrument(IDirectMusicCollection *iface,
DWORD index, DWORD *patch, LPWSTR name, DWORD name_length)
{
IDirectMusicCollectionImpl *This = impl_from_IDirectMusicCollection(iface);
DWORD i = 0;
DMUS_PRIVATE_INSTRUMENTENTRY *inst_entry;
struct list *list_entry;
DWORD length;
TRACE("(%p/%p)->(%d, %p, %p, %d)\n", iface, This, index, patch, name, name_length);
LIST_FOR_EACH(list_entry, &This->Instruments) {
inst_entry = LIST_ENTRY(list_entry, DMUS_PRIVATE_INSTRUMENTENTRY, entry);
if (i == index) {
IDirectMusicInstrumentImpl *instrument = impl_from_IDirectMusicInstrument(inst_entry->pInstrument);
IDirectMusicInstrument_GetPatch(inst_entry->pInstrument, patch);
if (name) {
length = min(strlenW(instrument->wszName), name_length - 1);
memcpy(name, instrument->wszName, length * sizeof(WCHAR));
name[length] = '\0';
}
return S_OK;
}
i++;
}
return S_FALSE;
}
static const IDirectMusicCollectionVtbl DirectMusicCollection_Collection_Vtbl = {
IDirectMusicCollectionImpl_QueryInterface,
IDirectMusicCollectionImpl_AddRef,
IDirectMusicCollectionImpl_Release,
IDirectMusicCollectionImpl_GetInstrument,
IDirectMusicCollectionImpl_EnumInstrument
};
/* IDirectMusicCollectionImpl IDirectMusicObject part: */
static HRESULT WINAPI col_IDirectMusicObject_ParseDescriptor(IDirectMusicObject *iface,
IStream *stream, DMUS_OBJECTDESC *desc)
{
struct chunk_entry riff = {0};
HRESULT hr;
TRACE("(%p, %p, %p)\n", iface, stream, desc);
if (!stream || !desc)
return E_POINTER;
if ((hr = stream_get_chunk(stream, &riff)) != S_OK)
return hr;
if (riff.id != FOURCC_RIFF || riff.type != FOURCC_DLS) {
TRACE("loading failed: unexpected %s\n", debugstr_chunk(&riff));
stream_skip_chunk(stream, &riff);
return DMUS_E_NOTADLSCOL;
}
hr = dmobj_parsedescriptor(stream, &riff, desc, DMUS_OBJ_NAME_INFO|DMUS_OBJ_VERSION);
if (FAILED(hr))
return hr;
desc->guidClass = CLSID_DirectMusicCollection;
desc->dwValidData |= DMUS_OBJ_CLASS;
TRACE("returning descriptor:\n");
dump_DMUS_OBJECTDESC(desc);
return S_OK;
}
static const IDirectMusicObjectVtbl dmobject_vtbl = {
dmobj_IDirectMusicObject_QueryInterface,
dmobj_IDirectMusicObject_AddRef,
dmobj_IDirectMusicObject_Release,
dmobj_IDirectMusicObject_GetDescriptor,
dmobj_IDirectMusicObject_SetDescriptor,
col_IDirectMusicObject_ParseDescriptor
};
/* IDirectMusicCollectionImpl IPersistStream part: */
static HRESULT WINAPI IPersistStreamImpl_Load(IPersistStream *iface,
IStream *stream)
{
IDirectMusicCollectionImpl *This = impl_from_IPersistStream(iface);
DMUS_PRIVATE_CHUNK chunk;
DWORD StreamSize, StreamCount, ListSize[2], ListCount[2];
LARGE_INTEGER liMove; /* used when skipping chunks */
ULARGE_INTEGER dlibCollectionPosition, dlibInstrumentPosition, dlibWavePoolPosition;
IStream_AddRef(stream); /* add count for later references */
liMove.QuadPart = 0;
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, &dlibCollectionPosition); /* store offset, in case it'll be needed later */
This->liCollectionPosition.QuadPart = dlibCollectionPosition.QuadPart;
This->pStm = stream;
IStream_Read(stream, &chunk, sizeof(FOURCC) + sizeof(DWORD), NULL);
TRACE_(dmfile)(": %s chunk (size = 0x%04x)", debugstr_fourcc(chunk.fccID), chunk.dwSize);
if (chunk.fccID != FOURCC_RIFF) {
TRACE_(dmfile)(": unexpected chunk; loading failed)\n");
liMove.QuadPart = chunk.dwSize;
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, NULL); /* skip the rest of the chunk */
return E_FAIL;
}
IStream_Read(stream, &chunk.fccID, sizeof(FOURCC), NULL);
TRACE_(dmfile)(": RIFF chunk of type %s", debugstr_fourcc(chunk.fccID));
StreamSize = chunk.dwSize - sizeof(FOURCC);
StreamCount = 0;
if (chunk.fccID != FOURCC_DLS) {
TRACE_(dmfile)(": unexpected chunk; loading failed)\n");
liMove.QuadPart = StreamSize;
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, NULL); /* skip the rest of the chunk */
return E_FAIL;
}
TRACE_(dmfile)(": collection form\n");
do {
IStream_Read(stream, &chunk, sizeof(FOURCC) + sizeof(DWORD), NULL);
StreamCount += sizeof(FOURCC) + sizeof(DWORD) + chunk.dwSize;
TRACE_(dmfile)(": %s chunk (size = 0x%04x)", debugstr_fourcc(chunk.fccID), chunk.dwSize);
switch (chunk.fccID) {
case FOURCC_COLH: {
TRACE_(dmfile)(": collection header chunk\n");
This->pHeader = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, chunk.dwSize);
IStream_Read(stream, This->pHeader, chunk.dwSize, NULL);
break;
}
case FOURCC_DLID: {
TRACE_(dmfile)(": DLID (GUID) chunk\n");
This->dmobj.desc.dwValidData |= DMUS_OBJ_OBJECT;
IStream_Read(stream, &This->dmobj.desc.guidObject, chunk.dwSize, NULL);
break;
}
case FOURCC_VERS: {
TRACE_(dmfile)(": version chunk\n");
This->dmobj.desc.dwValidData |= DMUS_OBJ_VERSION;
IStream_Read(stream, &This->dmobj.desc.vVersion, chunk.dwSize, NULL);
break;
}
case FOURCC_PTBL: {
TRACE_(dmfile)(": pool table chunk\n");
This->pPoolTable = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(POOLTABLE));
IStream_Read(stream, This->pPoolTable, sizeof(POOLTABLE), NULL);
chunk.dwSize -= sizeof(POOLTABLE);
This->pPoolCues = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, This->pPoolTable->cCues * sizeof(POOLCUE));
IStream_Read(stream, This->pPoolCues, chunk.dwSize, NULL);
break;
}
case FOURCC_LIST: {
IStream_Read(stream, &chunk.fccID, sizeof(FOURCC), NULL);
TRACE_(dmfile)(": LIST chunk of type %s", debugstr_fourcc(chunk.fccID));
ListSize[0] = chunk.dwSize - sizeof(FOURCC);
ListCount[0] = 0;
switch (chunk.fccID) {
case DMUS_FOURCC_INFO_LIST: {
TRACE_(dmfile)(": INFO list\n");
do {
IStream_Read(stream, &chunk, sizeof(FOURCC) + sizeof(DWORD), NULL);
ListCount[0] += sizeof(FOURCC) + sizeof(DWORD) + chunk.dwSize;
TRACE_(dmfile)(": %s chunk (size = 0x%04x)", debugstr_fourcc(chunk.fccID), chunk.dwSize);
switch (chunk.fccID) {
case mmioFOURCC('I','N','A','M'): {
CHAR szName[DMUS_MAX_NAME];
TRACE_(dmfile)(": name chunk\n");
This->dmobj.desc.dwValidData |= DMUS_OBJ_NAME;
IStream_Read(stream, szName, chunk.dwSize, NULL);
MultiByteToWideChar(CP_ACP, 0, szName, -1, This->dmobj.desc.wszName, DMUS_MAX_NAME);
if (even_or_odd(chunk.dwSize)) {
ListCount[0]++;
liMove.QuadPart = 1;
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, NULL);
}
break;
}
case mmioFOURCC('I','A','R','T'): {
TRACE_(dmfile)(": artist chunk (ignored)\n");
if (even_or_odd(chunk.dwSize)) {
ListCount[0]++;
chunk.dwSize++;
}
liMove.QuadPart = chunk.dwSize;
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, NULL);
break;
}
case mmioFOURCC('I','C','O','P'): {
TRACE_(dmfile)(": copyright chunk\n");
This->szCopyright = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, chunk.dwSize);
IStream_Read(stream, This->szCopyright, chunk.dwSize, NULL);
if (even_or_odd(chunk.dwSize)) {
ListCount[0]++;
liMove.QuadPart = 1;
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, NULL);
}
break;
}
case mmioFOURCC('I','S','B','J'): {
TRACE_(dmfile)(": subject chunk (ignored)\n");
if (even_or_odd(chunk.dwSize)) {
ListCount[0]++;
chunk.dwSize++;
}
liMove.QuadPart = chunk.dwSize;
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, NULL);
break;
}
case mmioFOURCC('I','C','M','T'): {
TRACE_(dmfile)(": comment chunk (ignored)\n");
if (even_or_odd(chunk.dwSize)) {
ListCount[0]++;
chunk.dwSize++;
}
liMove.QuadPart = chunk.dwSize;
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, NULL);
break;
}
default: {
TRACE_(dmfile)(": unknown chunk (irrelevant & skipping)\n");
if (even_or_odd(chunk.dwSize)) {
ListCount[0]++;
chunk.dwSize++;
}
liMove.QuadPart = chunk.dwSize;
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, NULL);
break;
}
}
TRACE_(dmfile)(": ListCount[0] = %d < ListSize[0] = %d\n", ListCount[0], ListSize[0]);
} while (ListCount[0] < ListSize[0]);
break;
}
case FOURCC_WVPL: {
TRACE_(dmfile)(": wave pool list (mark & skip)\n");
liMove.QuadPart = 0;
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, &dlibWavePoolPosition); /* store position */
This->liWavePoolTablePosition.QuadPart = dlibWavePoolPosition.QuadPart;
liMove.QuadPart = chunk.dwSize - sizeof(FOURCC);
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, NULL);
break;
}
case FOURCC_LINS: {
TRACE_(dmfile)(": instruments list\n");
do {
IStream_Read(stream, &chunk, sizeof(FOURCC) + sizeof(DWORD), NULL);
ListCount[0] += sizeof(FOURCC) + sizeof(DWORD) + chunk.dwSize;
TRACE_(dmfile)(": %s chunk (size = 0x%04x)", debugstr_fourcc(chunk.fccID), chunk.dwSize);
switch (chunk.fccID) {
case FOURCC_LIST: {
IStream_Read(stream, &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 FOURCC_INS: {
LPDMUS_PRIVATE_INSTRUMENTENTRY new_instrument = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(DMUS_PRIVATE_INSTRUMENTENTRY));
TRACE_(dmfile)(": instrument list\n");
/* Only way to create this one... even M$ does it discretely */
DMUSIC_CreateDirectMusicInstrumentImpl(&IID_IDirectMusicInstrument, (void**)&new_instrument->pInstrument, NULL);
{
IDirectMusicInstrumentImpl *instrument = impl_from_IDirectMusicInstrument(new_instrument->pInstrument);
/* Store offset and length, they will be needed when loading the instrument */
liMove.QuadPart = 0;
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, &dlibInstrumentPosition);
instrument->liInstrumentPosition.QuadPart = dlibInstrumentPosition.QuadPart;
instrument->length = ListSize[1];
do {
IStream_Read(stream, &chunk, sizeof(FOURCC) + sizeof(DWORD), NULL);
ListCount[1] += sizeof(FOURCC) + sizeof(DWORD) + chunk.dwSize;
TRACE_(dmfile)(": %s chunk (size = 0x%04x)", debugstr_fourcc(chunk.fccID), chunk.dwSize);
switch (chunk.fccID) {
case FOURCC_INSH: {
TRACE_(dmfile)(": instrument header chunk\n");
IStream_Read(stream, &instrument->header, chunk.dwSize, NULL);
break;
}
case FOURCC_DLID: {
TRACE_(dmfile)(": DLID (GUID) chunk\n");
IStream_Read(stream, &instrument->id, chunk.dwSize, NULL);
break;
}
case FOURCC_LIST: {
IStream_Read(stream, &chunk.fccID, sizeof(FOURCC), NULL);
TRACE_(dmfile)(": LIST chunk of type %s", debugstr_fourcc(chunk.fccID));
switch (chunk.fccID) {
default: {
TRACE_(dmfile)(": unknown (skipping)\n");
liMove.QuadPart = chunk.dwSize - sizeof(FOURCC);
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, NULL);
break;
}
}
break;
}
default: {
TRACE_(dmfile)(": unknown chunk (irrelevant & skipping)\n");
liMove.QuadPart = chunk.dwSize;
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, NULL);
break;
}
}
TRACE_(dmfile)(": ListCount[1] = %d < ListSize[1] = %d\n", ListCount[1], ListSize[1]);
} while (ListCount[1] < ListSize[1]);
/* DEBUG: dumps whole instrument object tree: */
if (TRACE_ON(dmusic)) {
TRACE("*** IDirectMusicInstrument (%p) ***\n", instrument);
if (!IsEqualGUID(&instrument->id, &GUID_NULL))
TRACE(" - GUID = %s\n", debugstr_dmguid(&instrument->id));
TRACE(" - Instrument header:\n");
TRACE(" - cRegions: %d\n", instrument->header.cRegions);
TRACE(" - Locale:\n");
TRACE(" - ulBank: %d\n", instrument->header.Locale.ulBank);
TRACE(" - ulInstrument: %d\n", instrument->header.Locale.ulInstrument);
TRACE(" => dwPatch: %d\n", MIDILOCALE2Patch(&instrument->header.Locale));
}
list_add_tail(&This->Instruments, &new_instrument->entry);
}
break;
}
}
break;
}
default: {
TRACE_(dmfile)(": unknown chunk (irrelevant & skipping)\n");
liMove.QuadPart = chunk.dwSize;
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, NULL);
break;
}
}
TRACE_(dmfile)(": ListCount[0] = %d < ListSize[0] = %d\n", ListCount[0], ListSize[0]);
} while (ListCount[0] < ListSize[0]);
break;
}
default: {
TRACE_(dmfile)(": unknown (skipping)\n");
liMove.QuadPart = chunk.dwSize - sizeof(FOURCC);
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, NULL);
break;
}
}
break;
}
default: {
TRACE_(dmfile)(": unknown chunk (irrelevant & skipping)\n");
liMove.QuadPart = chunk.dwSize;
IStream_Seek(stream, liMove, STREAM_SEEK_CUR, NULL);
break;
}
}
TRACE_(dmfile)(": StreamCount = %d < StreamSize = %d\n", StreamCount, StreamSize);
} while (StreamCount < StreamSize);
TRACE_(dmfile)(": reading finished\n");
/* DEBUG: dumps whole collection object tree: */
if (TRACE_ON(dmusic)) {
int r = 0;
DMUS_PRIVATE_INSTRUMENTENTRY *tmpEntry;
struct list *listEntry;
TRACE("*** IDirectMusicCollection (%p) ***\n", &This->IDirectMusicCollection_iface);
dump_DMUS_OBJECTDESC(&This->dmobj.desc);
TRACE(" - Collection header:\n");
TRACE(" - cInstruments: %d\n", This->pHeader->cInstruments);
TRACE(" - Instruments:\n");
LIST_FOR_EACH(listEntry, &This->Instruments) {
tmpEntry = LIST_ENTRY( listEntry, DMUS_PRIVATE_INSTRUMENTENTRY, entry );
TRACE(" - Instrument[%i]: %p\n", r, tmpEntry->pInstrument);
r++;
}
}
return S_OK;
}
static const IPersistStreamVtbl persiststream_vtbl = {
dmobj_IPersistStream_QueryInterface,
dmobj_IPersistStream_AddRef,
dmobj_IPersistStream_Release,
unimpl_IPersistStream_GetClassID,
unimpl_IPersistStream_IsDirty,
IPersistStreamImpl_Load,
unimpl_IPersistStream_Save,
unimpl_IPersistStream_GetSizeMax
};
HRESULT WINAPI DMUSIC_CreateDirectMusicCollectionImpl(LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter)
{
IDirectMusicCollectionImpl* obj;
HRESULT hr;
*ppobj = NULL;
if (pUnkOuter)
return CLASS_E_NOAGGREGATION;
obj = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IDirectMusicCollectionImpl));
if (!obj)
return E_OUTOFMEMORY;
obj->IDirectMusicCollection_iface.lpVtbl = &DirectMusicCollection_Collection_Vtbl;
obj->ref = 1;
dmobject_init(&obj->dmobj, &CLSID_DirectMusicCollection,
(IUnknown*)&obj->IDirectMusicCollection_iface);
obj->dmobj.IDirectMusicObject_iface.lpVtbl = &dmobject_vtbl;
obj->dmobj.IPersistStream_iface.lpVtbl = &persiststream_vtbl;
list_init (&obj->Instruments);
DMUSIC_LockModule();
hr = IDirectMusicCollection_QueryInterface(&obj->IDirectMusicCollection_iface, lpcGUID, ppobj);
IDirectMusicCollection_Release(&obj->IDirectMusicCollection_iface);
return hr;
}