/* IDirectMusicBand 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 "dmband_private.h"
#include "dmobject.h"

WINE_DEFAULT_DEBUG_CHANNEL(dmband);
WINE_DECLARE_DEBUG_CHANNEL(dmfile);


/*****************************************************************************
 * IDirectMusicBandImpl implementation
 */
typedef struct IDirectMusicBandImpl {
    IDirectMusicBand IDirectMusicBand_iface;
    struct dmobject dmobj;
    LONG ref;
    struct list Instruments;
} IDirectMusicBandImpl;

static inline IDirectMusicBandImpl *impl_from_IDirectMusicBand(IDirectMusicBand *iface)
{
    return CONTAINING_RECORD(iface, IDirectMusicBandImpl, IDirectMusicBand_iface);
}

/* DirectMusicBandImpl IDirectMusicBand part: */
static HRESULT WINAPI IDirectMusicBandImpl_QueryInterface(IDirectMusicBand *iface, REFIID riid,
        void **ret_iface)
{
    IDirectMusicBandImpl *This = impl_from_IDirectMusicBand(iface);

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

    *ret_iface = NULL;

    if (IsEqualIID(riid, &IID_IUnknown) || IsEqualIID(riid, &IID_IDirectMusicBand))
        *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, %s, %p): not found\n", This, debugstr_dmguid(riid), ret_iface);
        return E_NOINTERFACE;
    }

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

static ULONG WINAPI IDirectMusicBandImpl_AddRef(IDirectMusicBand *iface)
{
    IDirectMusicBandImpl *This = impl_from_IDirectMusicBand(iface);
    LONG ref = InterlockedIncrement(&This->ref);

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

    return ref;
}

static ULONG WINAPI IDirectMusicBandImpl_Release(IDirectMusicBand *iface)
{
    IDirectMusicBandImpl *This = impl_from_IDirectMusicBand(iface);
    LONG ref = InterlockedDecrement(&This->ref);

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

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

    return ref;
}

static HRESULT WINAPI IDirectMusicBandImpl_CreateSegment(IDirectMusicBand *iface,
        IDirectMusicSegment **ppSegment)
{
        IDirectMusicBandImpl *This = impl_from_IDirectMusicBand(iface);
	FIXME("(%p, %p): stub\n", This, ppSegment);
	return S_OK;
}

static HRESULT WINAPI IDirectMusicBandImpl_Download(IDirectMusicBand *iface,
        IDirectMusicPerformance *pPerformance)
{
        IDirectMusicBandImpl *This = impl_from_IDirectMusicBand(iface);
	FIXME("(%p, %p): stub\n", This, pPerformance);
	return S_OK;
}

static HRESULT WINAPI IDirectMusicBandImpl_Unload(IDirectMusicBand *iface,
        IDirectMusicPerformance *pPerformance)
{
        IDirectMusicBandImpl *This = impl_from_IDirectMusicBand(iface);
	FIXME("(%p, %p): stub\n", This, pPerformance);
	return S_OK;
}

static const IDirectMusicBandVtbl dmband_vtbl = {
    IDirectMusicBandImpl_QueryInterface,
    IDirectMusicBandImpl_AddRef,
    IDirectMusicBandImpl_Release,
    IDirectMusicBandImpl_CreateSegment,
    IDirectMusicBandImpl_Download,
    IDirectMusicBandImpl_Unload
};

/* IDirectMusicBandImpl IDirectMusicObject part: */
static HRESULT WINAPI IDirectMusicObjectImpl_ParseDescriptor(IDirectMusicObject *iface,
        IStream *pStream, DMUS_OBJECTDESC *pDesc)
{
	DMUS_PRIVATE_CHUNK Chunk;
	DWORD StreamSize, StreamCount, ListSize[1], ListCount[1];
	LARGE_INTEGER liMove; /* used when skipping chunks */

	TRACE("(%p, %p)\n", pStream, pDesc);

	/* FIXME: should this be determined from stream? */
	pDesc->dwValidData |= DMUS_OBJ_CLASS;
	pDesc->guidClass = CLSID_DirectMusicBand;

	IStream_Read (pStream, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
	TRACE_(dmfile)(": %s chunk (size = 0x%04x)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);
	switch (Chunk.fccID) {	
		case FOURCC_RIFF: {
			IStream_Read (pStream, &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 == DMUS_FOURCC_BAND_FORM) {
				TRACE_(dmfile)(": band form\n");
				do {
					IStream_Read (pStream, &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 DMUS_FOURCC_GUID_CHUNK: {
							TRACE_(dmfile)(": GUID chunk\n");
							pDesc->dwValidData |= DMUS_OBJ_OBJECT;
							IStream_Read (pStream, &pDesc->guidObject, Chunk.dwSize, NULL);
							break;
						}
						case DMUS_FOURCC_VERSION_CHUNK: {
							TRACE_(dmfile)(": version chunk\n");
							pDesc->dwValidData |= DMUS_OBJ_VERSION;
							IStream_Read (pStream, &pDesc->vVersion, Chunk.dwSize, NULL);
							break;
						}
						case DMUS_FOURCC_CATEGORY_CHUNK: {
							TRACE_(dmfile)(": category chunk\n");
							pDesc->dwValidData |= DMUS_OBJ_CATEGORY;
							IStream_Read (pStream, pDesc->wszCategory, Chunk.dwSize, NULL);
							break;
						}
						case FOURCC_LIST: {
							IStream_Read (pStream, &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) {
								/* evil M$ UNFO list, which can (!?) contain INFO elements */
								case DMUS_FOURCC_UNFO_LIST: {
									TRACE_(dmfile)(": UNFO list\n");
									do {
										IStream_Read (pStream, &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) {
											/* don't ask me why, but M$ puts INFO elements in UNFO list sometimes
                                             (though strings seem to be valid unicode) */
											case mmioFOURCC('I','N','A','M'):
											case DMUS_FOURCC_UNAM_CHUNK: {
												TRACE_(dmfile)(": name chunk\n");
												pDesc->dwValidData |= DMUS_OBJ_NAME;
												IStream_Read (pStream, pDesc->wszName, Chunk.dwSize, NULL);
												break;
											}
											case mmioFOURCC('I','A','R','T'):
											case DMUS_FOURCC_UART_CHUNK: {
												TRACE_(dmfile)(": artist chunk (ignored)\n");
												liMove.QuadPart = Chunk.dwSize;
												IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL);
												break;
											}
											case mmioFOURCC('I','C','O','P'):
											case DMUS_FOURCC_UCOP_CHUNK: {
												TRACE_(dmfile)(": copyright chunk (ignored)\n");
												liMove.QuadPart = Chunk.dwSize;
												IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL);
												break;
											}
											case mmioFOURCC('I','S','B','J'):
											case DMUS_FOURCC_USBJ_CHUNK: {
												TRACE_(dmfile)(": subject chunk (ignored)\n");
												liMove.QuadPart = Chunk.dwSize;
												IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL);
												break;
											}
											case mmioFOURCC('I','C','M','T'):
											case DMUS_FOURCC_UCMT_CHUNK: {
												TRACE_(dmfile)(": comment chunk (ignored)\n");
												liMove.QuadPart = Chunk.dwSize;
												IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL);
												break;
											}
											default: {
												TRACE_(dmfile)(": unknown chunk (irrelevant & skipping)\n");
												liMove.QuadPart = Chunk.dwSize;
												IStream_Seek (pStream, 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 (pStream, liMove, STREAM_SEEK_CUR, NULL);
									break;						
								}
							}
							break;
						}	
						default: {
							TRACE_(dmfile)(": unknown chunk (irrelevant & skipping)\n");
							liMove.QuadPart = Chunk.dwSize;
							IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL);
							break;						
						}
					}
					TRACE_(dmfile)(": StreamCount[0] = %d < StreamSize[0] = %d\n", StreamCount, StreamSize);
				} while (StreamCount < StreamSize);
			} else {
				TRACE_(dmfile)(": unexpected chunk; loading failed)\n");
				liMove.QuadPart = StreamSize;
				IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL); /* skip the rest of the chunk */
				return E_FAIL;
			}
		
			TRACE_(dmfile)(": reading finished\n");
			break;
		}
		default: {
			TRACE_(dmfile)(": unexpected chunk; loading failed)\n");
			liMove.QuadPart = Chunk.dwSize;
			IStream_Seek (pStream, liMove, STREAM_SEEK_CUR, NULL); /* skip the rest of the chunk */
			return DMUS_E_INVALIDFILE;
		}
	}	
	
	TRACE(": returning descriptor:\n"); debug_DMUS_OBJECTDESC (pDesc);
	
	return S_OK;
}

static const IDirectMusicObjectVtbl dmobject_vtbl = {
    dmobj_IDirectMusicObject_QueryInterface,
    dmobj_IDirectMusicObject_AddRef,
    dmobj_IDirectMusicObject_Release,
    dmobj_IDirectMusicObject_GetDescriptor,
    dmobj_IDirectMusicObject_SetDescriptor,
    IDirectMusicObjectImpl_ParseDescriptor
};

/* IDirectMusicBandImpl IPersistStream part: */
static HRESULT parse_instrument(IDirectMusicBandImpl *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;

  DMUS_IO_INSTRUMENT inst;
  LPDMUS_PRIVATE_INSTRUMENT pNewInstrument;
  IDirectMusicObject* pObject = NULL;

  if (pChunk->fccID != DMUS_FOURCC_INSTRUMENT_LIST) {
    ERR_(dmfile)(": %s chunk should be an INSTRUMENT 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_INSTRUMENT_CHUNK: {
      TRACE_(dmfile)(": Instrument chunk\n");
      if (Chunk.dwSize != sizeof(DMUS_IO_INSTRUMENT)) return E_FAIL;
      IStream_Read (pStm, &inst, sizeof(DMUS_IO_INSTRUMENT), NULL);
      TRACE_(dmfile)(" - dwPatch: %u\n", inst.dwPatch);
      TRACE_(dmfile)(" - dwAssignPatch: %u\n", inst.dwAssignPatch);
      TRACE_(dmfile)(" - dwNoteRanges[0]: %u\n", inst.dwNoteRanges[0]);
      TRACE_(dmfile)(" - dwNoteRanges[1]: %u\n", inst.dwNoteRanges[1]);
      TRACE_(dmfile)(" - dwNoteRanges[2]: %u\n", inst.dwNoteRanges[2]);
      TRACE_(dmfile)(" - dwNoteRanges[3]: %u\n", inst.dwNoteRanges[3]);
      TRACE_(dmfile)(" - dwPChannel: %u\n", inst.dwPChannel);
      TRACE_(dmfile)(" - dwFlags: %x\n", inst.dwFlags);
      TRACE_(dmfile)(" - bPan: %u\n", inst.bPan);
      TRACE_(dmfile)(" - bVolume: %u\n", inst.bVolume);
      TRACE_(dmfile)(" - nTranspose: %d\n", inst.nTranspose);
      TRACE_(dmfile)(" - dwChannelPriority: %u\n", inst.dwChannelPriority);
      TRACE_(dmfile)(" - nPitchBendRange: %d\n", inst.nPitchBendRange);
      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_REF_LIST: {
	FIXME_(dmfile)(": DMRF (DM References) list\n");
        hr = IDirectMusicUtils_IPersistStream_ParseReference(&This->dmobj.IPersistStream_iface,
                &Chunk, pStm, &pObject);
	if (FAILED(hr)) {
	  ERR(": could not load Reference\n");
	  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]);
  
  /*
   * @TODO insert pNewInstrument into This
   */
  pNewInstrument = HeapAlloc (GetProcessHeap (), HEAP_ZERO_MEMORY, sizeof(DMUS_PRIVATE_INSTRUMENT));
  if (NULL == pNewInstrument) {
    ERR(": no more memory\n");
    return  E_OUTOFMEMORY;
  }
  memcpy(&pNewInstrument->pInstrument, &inst, sizeof(DMUS_IO_INSTRUMENT));
  pNewInstrument->ppReferenceCollection = NULL;
  if (NULL != pObject) {
    IDirectMusicCollection* pCol = NULL;
    hr = IDirectMusicObject_QueryInterface (pObject, &IID_IDirectMusicCollection, (void**) &pCol);
    if (FAILED(hr)) {
      ERR(": failed to get IDirectMusicCollection Interface from DMObject\n");
      HeapFree(GetProcessHeap(), 0, pNewInstrument);

      return hr;
    }
    pNewInstrument->ppReferenceCollection = pCol;
    IDirectMusicObject_Release(pObject);
  }
  list_add_tail (&This->Instruments, &pNewInstrument->entry);

  return S_OK;
}

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

  if (pChunk->fccID != DMUS_FOURCC_INSTRUMENTS_LIST) {
    ERR_(dmfile)(": %s chunk should be an INSTRUMENTS 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_INSTRUMENT_LIST: {
	TRACE_(dmfile)(": Instrument list\n");
        hr = parse_instrument(This, &Chunk, pStm);
	if (FAILED(hr)) return hr;
	break;
      }
      default: {
	TRACE_(dmfile)(": unknown chunk (irrelevant & skipping)\n");
	liMove.QuadPart = ListSize[1];
	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_band_form(IDirectMusicBandImpl *This, DMUS_PRIVATE_CHUNK *pChunk,
        IStream *pStm)
{
  HRESULT hr = E_FAIL;
  DMUS_PRIVATE_CHUNK Chunk;
  DWORD StreamSize, StreamCount, ListSize[3], ListCount[3];
  LARGE_INTEGER liMove; /* used when skipping chunks */

  GUID tmp_guid;

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

  StreamSize = pChunk->dwSize - sizeof(FOURCC);
  StreamCount = 0;

  do {
    IStream_Read (pStm, &Chunk, sizeof(FOURCC)+sizeof(DWORD), NULL);
    StreamCount += sizeof(FOURCC) + sizeof(DWORD) + Chunk.dwSize;
    TRACE_(dmfile)(": %s chunk (size = %d)", debugstr_fourcc (Chunk.fccID), Chunk.dwSize);

    hr = IDirectMusicUtils_IPersistStream_ParseDescGeneric(&Chunk, pStm, &This->dmobj.desc);
    if (FAILED(hr)) return hr;
    
    if (hr == S_FALSE) {
      switch (Chunk.fccID) {
      case DMUS_FOURCC_GUID_CHUNK: {
	TRACE_(dmfile)(": GUID\n");
	IStream_Read (pStm, &tmp_guid, sizeof(GUID), NULL);
	TRACE_(dmfile)(" - guid: %s\n", debugstr_dmguid(&tmp_guid));
	break;
      }
      case FOURCC_LIST: {
	IStream_Read (pStm, &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_UNFO_LIST: { 
	  TRACE_(dmfile)(": UNFO list\n");
	  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);

            hr = IDirectMusicUtils_IPersistStream_ParseUNFOGeneric(&Chunk, pStm, &This->dmobj.desc);
	    if (FAILED(hr)) return hr;
	    
	    if (hr == S_FALSE) {
	      switch (Chunk.fccID) {
	      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]);
	  break;
	}
	case DMUS_FOURCC_INSTRUMENTS_LIST: {
	  TRACE_(dmfile)(": INSTRUMENTS list\n");
          hr = parse_instruments_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)(": StreamCount[0] = %d < StreamSize[0] = %d\n", StreamCount, StreamSize);
  } while (StreamCount < StreamSize);  

  return S_OK;
}

static inline IDirectMusicBandImpl *impl_from_IPersistStream(IPersistStream *iface)
{
    return CONTAINING_RECORD(iface, IDirectMusicBandImpl, dmobj.IPersistStream_iface);
}

static HRESULT WINAPI IPersistStreamImpl_Load(IPersistStream *iface, IStream *pStm)
{
  IDirectMusicBandImpl *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_RIFF: {
    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_BAND_FORM: {
      TRACE_(dmfile)(": Band form\n");
      hr = parse_band_form(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,
    unimpl_IPersistStream_GetClassID,
    unimpl_IPersistStream_IsDirty,
    IPersistStreamImpl_Load,
    unimpl_IPersistStream_Save,
    unimpl_IPersistStream_GetSizeMax
};

/* for ClassFactory */
HRESULT WINAPI create_dmband(REFIID lpcGUID, void **ppobj)
{
  IDirectMusicBandImpl* obj;
  HRESULT hr;

  obj = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IDirectMusicBandImpl));
  if (NULL == obj) {
    *ppobj = NULL;
    return E_OUTOFMEMORY;
  }
  obj->IDirectMusicBand_iface.lpVtbl = &dmband_vtbl;
  obj->ref = 1;
  dmobject_init(&obj->dmobj, &CLSID_DirectMusicBand, (IUnknown *)&obj->IDirectMusicBand_iface);
  obj->dmobj.IDirectMusicObject_iface.lpVtbl = &dmobject_vtbl;
  obj->dmobj.IPersistStream_iface.lpVtbl = &persiststream_vtbl;
  list_init (&obj->Instruments);

  DMBAND_LockModule();
  hr = IDirectMusicBand_QueryInterface(&obj->IDirectMusicBand_iface, lpcGUID, ppobj);
  IDirectMusicBand_Release(&obj->IDirectMusicBand_iface);

  return hr;
}