text: /*
   * Copyright (C) 2015 Austin English
   *
   * This library 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 library 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 library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
   */
  
  
  #include <stdarg.h>
  
  #define COBJMACROS
  
  #include "windef.h"
  #include "winbase.h"
  #include "mfidl.h"
  #include "rpcproxy.h"
  
  #include "mfapi.h"
  #include "mferror.h"
  
  #include "mf_private.h"
  
  #include "wine/debug.h"
  #include "wine/heap.h"
  #include "wine/list.h"
  
  WINE_DEFAULT_DEBUG_CHANNEL(mfplat);
  
  static HINSTANCE mf_instance;
  extern const GUID CLSID_FileSchemePlugin;
  
  struct activate_object
  {
      IMFActivate IMFActivate_iface;
      LONG refcount;
      IMFAttributes *attributes;
      IUnknown *object;
      const struct activate_funcs *funcs;
      void *context;
  };
  
  static struct activate_object *impl_from_IMFActivate(IMFActivate *iface)
  {
      return CONTAINING_RECORD(iface, struct activate_object, IMFActivate_iface);
  }
  
  static HRESULT WINAPI activate_object_QueryInterface(IMFActivate *iface, REFIID riid, void **obj)
  {
      TRACE("%p, %s, %p.\n", iface, debugstr_guid(riid), obj);
  
      if (IsEqualIID(riid, &IID_IMFActivate) ||
              IsEqualIID(riid, &IID_IMFAttributes) ||
              IsEqualIID(riid, &IID_IUnknown))
      {
          *obj = iface;
          IMFActivate_AddRef(iface);
          return S_OK;
      }
  
      WARN("Unsupported %s.\n", debugstr_guid(riid));
      *obj = NULL;
      return E_NOINTERFACE;
  }
  
  static ULONG WINAPI activate_object_AddRef(IMFActivate *iface)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
      ULONG refcount = InterlockedIncrement(&activate->refcount);
  
      TRACE("%p, refcount %u.\n", iface, refcount);
  
      return refcount;
  }
  
  static ULONG WINAPI activate_object_Release(IMFActivate *iface)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
      ULONG refcount = InterlockedDecrement(&activate->refcount);
  
      TRACE("%p, refcount %u.\n", iface, refcount);
  
      if (!refcount)
      {
          activate->funcs->free_private(activate->context);
          if (activate->object)
              IUnknown_Release(activate->object);
          IMFAttributes_Release(activate->attributes);
          heap_free(activate);
      }
  
      return refcount;
  }
  
  static HRESULT WINAPI activate_object_GetItem(IMFActivate *iface, REFGUID key, PROPVARIANT *value)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %p.\n", iface, debugstr_guid(key), value);
  
      return IMFAttributes_GetItem(activate->attributes, key, value);
  }
  
  static HRESULT WINAPI activate_object_GetItemType(IMFActivate *iface, REFGUID key, MF_ATTRIBUTE_TYPE *type)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %p.\n", iface, debugstr_guid(key), type);
  
      return IMFAttributes_GetItemType(activate->attributes, key, type);
  }
  
  static HRESULT WINAPI activate_object_CompareItem(IMFActivate *iface, REFGUID key, REFPROPVARIANT value, BOOL *result)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %p, %p.\n", iface, debugstr_guid(key), value, result);
  
      return IMFAttributes_CompareItem(activate->attributes, key, value, result);
  }
  
  static HRESULT WINAPI activate_object_Compare(IMFActivate *iface, IMFAttributes *theirs, MF_ATTRIBUTES_MATCH_TYPE type,
          BOOL *result)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %p, %d, %p.\n", iface, theirs, type, result);
  
      return IMFAttributes_Compare(activate->attributes, theirs, type, result);
  }
  
  static HRESULT WINAPI activate_object_GetUINT32(IMFActivate *iface, REFGUID key, UINT32 *value)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %p.\n", iface, debugstr_guid(key), value);
  
      return IMFAttributes_GetUINT32(activate->attributes, key, value);
  }
  
  static HRESULT WINAPI activate_object_GetUINT64(IMFActivate *iface, REFGUID key, UINT64 *value)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %p.\n", iface, debugstr_guid(key), value);
  
      return IMFAttributes_GetUINT64(activate->attributes, key, value);
  }
  
  static HRESULT WINAPI activate_object_GetDouble(IMFActivate *iface, REFGUID key, double *value)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %p.\n", iface, debugstr_guid(key), value);
  
      return IMFAttributes_GetDouble(activate->attributes, key, value);
  }
  
  static HRESULT WINAPI activate_object_GetGUID(IMFActivate *iface, REFGUID key, GUID *value)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %p.\n", iface, debugstr_guid(key), value);
  
      return IMFAttributes_GetGUID(activate->attributes, key, value);
  }
  
  static HRESULT WINAPI activate_object_GetStringLength(IMFActivate *iface, REFGUID key, UINT32 *length)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %p.\n", iface, debugstr_guid(key), length);
  
      return IMFAttributes_GetStringLength(activate->attributes, key, length);
  }
  
  static HRESULT WINAPI activate_object_GetString(IMFActivate *iface, REFGUID key, WCHAR *value,
          UINT32 size, UINT32 *length)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %p, %d, %p.\n", iface, debugstr_guid(key), value, size, length);
  
      return IMFAttributes_GetString(activate->attributes, key, value, size, length);
  }
  
  static HRESULT WINAPI activate_object_GetAllocatedString(IMFActivate *iface, REFGUID key,
          WCHAR **value, UINT32 *length)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %p, %p.\n", iface, debugstr_guid(key), value, length);
  
      return IMFAttributes_GetAllocatedString(activate->attributes, key, value, length);
  }
  
  static HRESULT WINAPI activate_object_GetBlobSize(IMFActivate *iface, REFGUID key, UINT32 *size)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %p.\n", iface, debugstr_guid(key), size);
  
      return IMFAttributes_GetBlobSize(activate->attributes, key, size);
  }
  
  static HRESULT WINAPI activate_object_GetBlob(IMFActivate *iface, REFGUID key, UINT8 *buf,
          UINT32 bufsize, UINT32 *blobsize)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %p, %d, %p.\n", iface, debugstr_guid(key), buf, bufsize, blobsize);
  
      return IMFAttributes_GetBlob(activate->attributes, key, buf, bufsize, blobsize);
  }
  
  static HRESULT WINAPI activate_object_GetAllocatedBlob(IMFActivate *iface, REFGUID key, UINT8 **buf, UINT32 *size)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %p, %p.\n", iface, debugstr_guid(key), buf, size);
  
      return IMFAttributes_GetAllocatedBlob(activate->attributes, key, buf, size);
  }
  
  static HRESULT WINAPI activate_object_GetUnknown(IMFActivate *iface, REFGUID key, REFIID riid, void **ppv)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %s, %p.\n", iface, debugstr_guid(key), debugstr_guid(riid), ppv);
  
      return IMFAttributes_GetUnknown(activate->attributes, key, riid, ppv);
  }
  
  static HRESULT WINAPI activate_object_SetItem(IMFActivate *iface, REFGUID key, REFPROPVARIANT value)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %p.\n", iface, debugstr_guid(key), value);
  
      return IMFAttributes_SetItem(activate->attributes, key, value);
  }
  
  static HRESULT WINAPI activate_object_DeleteItem(IMFActivate *iface, REFGUID key)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s.\n", iface, debugstr_guid(key));
  
      return IMFAttributes_DeleteItem(activate->attributes, key);
  }
  
  static HRESULT WINAPI activate_object_DeleteAllItems(IMFActivate *iface)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p.\n", iface);
  
      return IMFAttributes_DeleteAllItems(activate->attributes);
  }
  
  static HRESULT WINAPI activate_object_SetUINT32(IMFActivate *iface, REFGUID key, UINT32 value)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %d.\n", iface, debugstr_guid(key), value);
  
      return IMFAttributes_SetUINT32(activate->attributes, key, value);
  }
  
  static HRESULT WINAPI activate_object_SetUINT64(IMFActivate *iface, REFGUID key, UINT64 value)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %s.\n", iface, debugstr_guid(key), wine_dbgstr_longlong(value));
  
      return IMFAttributes_SetUINT64(activate->attributes, key, value);
  }
  
  static HRESULT WINAPI activate_object_SetDouble(IMFActivate *iface, REFGUID key, double value)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %f.\n", iface, debugstr_guid(key), value);
  
      return IMFAttributes_SetDouble(activate->attributes, key, value);
  }
  
  static HRESULT WINAPI activate_object_SetGUID(IMFActivate *iface, REFGUID key, REFGUID value)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %s.\n", iface, debugstr_guid(key), debugstr_guid(value));
  
      return IMFAttributes_SetGUID(activate->attributes, key, value);
  }
  
  static HRESULT WINAPI activate_object_SetString(IMFActivate *iface, REFGUID key, const WCHAR *value)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %s.\n", iface, debugstr_guid(key), debugstr_w(value));
  
      return IMFAttributes_SetString(activate->attributes, key, value);
  }
  
  static HRESULT WINAPI activate_object_SetBlob(IMFActivate *iface, REFGUID key, const UINT8 *buf, UINT32 size)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %s, %p, %d.\n", iface, debugstr_guid(key), buf, size);
  
      return IMFAttributes_SetBlob(activate->attributes, key, buf, size);
  }
  
  static HRESULT WINAPI activate_object_SetUnknown(IMFActivate *iface, REFGUID key, IUnknown *unknown)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("(%p)->(%s, %p)\n", iface, debugstr_guid(key), unknown);
  
      return IMFAttributes_SetUnknown(activate->attributes, key, unknown);
  }
  
  static HRESULT WINAPI activate_object_LockStore(IMFActivate *iface)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p.\n", iface);
  
      return IMFAttributes_LockStore(activate->attributes);
  }
  
  static HRESULT WINAPI activate_object_UnlockStore(IMFActivate *iface)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p.\n", iface);
  
      return IMFAttributes_UnlockStore(activate->attributes);
  }
  
  static HRESULT WINAPI activate_object_GetCount(IMFActivate *iface, UINT32 *count)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %p.\n", iface, count);
  
      return IMFAttributes_GetCount(activate->attributes, count);
  }
  
  static HRESULT WINAPI activate_object_GetItemByIndex(IMFActivate *iface, UINT32 index, GUID *key, PROPVARIANT *value)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %u, %p, %p.\n", iface, index, key, value);
  
      return IMFAttributes_GetItemByIndex(activate->attributes, index, key, value);
  }
  
  static HRESULT WINAPI activate_object_CopyAllItems(IMFActivate *iface, IMFAttributes *dest)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
  
      TRACE("%p, %p.\n", iface, dest);
  
      return IMFAttributes_CopyAllItems(activate->attributes, dest);
  }
  
  static HRESULT WINAPI activate_object_ActivateObject(IMFActivate *iface, REFIID riid, void **obj)
  {
      struct activate_object *activate = impl_from_IMFActivate(iface);
      IUnknown *object;
      HRESULT hr;
  
      TRACE("%p, %s, %p.\n", iface, debugstr_guid(riid), obj);
  
      if (!activate->object)
      {
          if (FAILED(hr = activate->funcs->create_object((IMFAttributes *)iface, activate->context, &object)))
              return hr;
  
          if (InterlockedCompareExchangePointer((void **)&activate->object, object, NULL))
              IUnknown_Release(object);
      }
  
      return IUnknown_QueryInterface(activate->object, riid, obj);
  }
  
  static HRESULT WINAPI activate_object_ShutdownObject(IMFActivate *iface)
  {
      FIXME("%p.\n", iface);
  
      return E_NOTIMPL;
  }
  
  static HRESULT WINAPI activate_object_DetachObject(IMFActivate *iface)
  {
      FIXME("%p.\n", iface);
  
      return E_NOTIMPL;
  }
  
  static const IMFActivateVtbl activate_object_vtbl =
  {
      activate_object_QueryInterface,
      activate_object_AddRef,
      activate_object_Release,
      activate_object_GetItem,
      activate_object_GetItemType,
      activate_object_CompareItem,
      activate_object_Compare,
      activate_object_GetUINT32,
      activate_object_GetUINT64,
      activate_object_GetDouble,
      activate_object_GetGUID,
      activate_object_GetStringLength,
      activate_object_GetString,
      activate_object_GetAllocatedString,
      activate_object_GetBlobSize,
      activate_object_GetBlob,
      activate_object_GetAllocatedBlob,
      activate_object_GetUnknown,
      activate_object_SetItem,
      activate_object_DeleteItem,
      activate_object_DeleteAllItems,
      activate_object_SetUINT32,
      activate_object_SetUINT64,
      activate_object_SetDouble,
      activate_object_SetGUID,
      activate_object_SetString,
      activate_object_SetBlob,
      activate_object_SetUnknown,
      activate_object_LockStore,
      activate_object_UnlockStore,
      activate_object_GetCount,
      activate_object_GetItemByIndex,
      activate_object_CopyAllItems,
      activate_object_ActivateObject,
      activate_object_ShutdownObject,
      activate_object_DetachObject,
  };
  
  HRESULT create_activation_object(void *context, const struct activate_funcs *funcs, IMFActivate **ret)
  {
      struct activate_object *object;
      HRESULT hr;
  
      object = heap_alloc_zero(sizeof(*object));
      if (!object)
          return E_OUTOFMEMORY;
  
      object->IMFActivate_iface.lpVtbl = &activate_object_vtbl;
      object->refcount = 1;
      if (FAILED(hr = MFCreateAttributes(&object->attributes, 0)))
      {
          heap_free(object);
          return hr;
      }
      object->funcs = funcs;
      object->context = context;
  
      *ret = &object->IMFActivate_iface;
  
      return S_OK;
  }
  
  struct class_factory
  {
      IClassFactory IClassFactory_iface;
      HRESULT (*create_instance)(REFIID riid, void **obj);
  };
  
  static inline struct class_factory *impl_from_IClassFactory(IClassFactory *iface)
  {
      return CONTAINING_RECORD(iface, struct class_factory, IClassFactory_iface);
  }
  
  static HRESULT WINAPI class_factory_QueryInterface(IClassFactory *iface, REFIID riid, void **obj)
  {
      TRACE("%p, %s, %p.\n", iface, debugstr_guid(riid), obj);
  
      if (IsEqualGUID(riid, &IID_IClassFactory) ||
              IsEqualGUID(riid, &IID_IUnknown))
      {
          *obj = iface;
          IClassFactory_AddRef(iface);
          return S_OK;
      }
  
      WARN("%s is not supported.\n", debugstr_guid(riid));
      *obj = NULL;
      return E_NOINTERFACE;
  }
  
  static ULONG WINAPI class_factory_AddRef(IClassFactory *iface)
  {
      return 2;
  }
  
  static ULONG WINAPI class_factory_Release(IClassFactory *iface)
  {
      return 1;
  }
  
  static HRESULT WINAPI class_factory_CreateInstance(IClassFactory *iface, IUnknown *outer, REFIID riid, void **obj)
  {
      struct class_factory *factory = impl_from_IClassFactory(iface);
  
      TRACE("%p, %p, %s, %p.\n", iface, outer, debugstr_guid(riid), obj);
  
      if (outer)
      {
          *obj = NULL;
          return CLASS_E_NOAGGREGATION;
      }
  
      return factory->create_instance(riid, obj);
  }
  
  static HRESULT WINAPI class_factory_LockServer(IClassFactory *iface, BOOL dolock)
  {
      FIXME("%d.\n", dolock);
  
      return S_OK;
  }
  
  static const IClassFactoryVtbl class_factory_vtbl =
  {
      class_factory_QueryInterface,
      class_factory_AddRef,
      class_factory_Release,
      class_factory_CreateInstance,
      class_factory_LockServer,
  };
  
  struct file_scheme_handler_result
  {
      struct list entry;
      IMFAsyncResult *result;
      MF_OBJECT_TYPE obj_type;
      IUnknown *object;
  };
  
  struct file_scheme_handler
  {
      IMFSchemeHandler IMFSchemeHandler_iface;
      IMFAsyncCallback IMFAsyncCallback_iface;
      LONG refcount;
      IMFSourceResolver *resolver;
      struct list results;
      CRITICAL_SECTION cs;
  };
  
  static struct file_scheme_handler *impl_from_IMFSchemeHandler(IMFSchemeHandler *iface)
  {
      return CONTAINING_RECORD(iface, struct file_scheme_handler, IMFSchemeHandler_iface);
  }
  
  static struct file_scheme_handler *impl_from_IMFAsyncCallback(IMFAsyncCallback *iface)
  {
      return CONTAINING_RECORD(iface, struct file_scheme_handler, IMFAsyncCallback_iface);
  }
  
  static HRESULT WINAPI file_scheme_handler_QueryInterface(IMFSchemeHandler *iface, REFIID riid, void **obj)
  {
      TRACE("%p, %s, %p.\n", iface, debugstr_guid(riid), obj);
  
      if (IsEqualIID(riid, &IID_IMFSchemeHandler) ||
              IsEqualIID(riid, &IID_IUnknown))
      {
          *obj = iface;
          IMFSchemeHandler_AddRef(iface);
          return S_OK;
      }
  
      WARN("Unsupported %s.\n", debugstr_guid(riid));
      *obj = NULL;
      return E_NOINTERFACE;
  }
  
  static ULONG WINAPI file_scheme_handler_AddRef(IMFSchemeHandler *iface)
  {
      struct file_scheme_handler *handler = impl_from_IMFSchemeHandler(iface);
      ULONG refcount = InterlockedIncrement(&handler->refcount);
  
      TRACE("%p, refcount %u.\n", handler, refcount);
  
      return refcount;
  }
  
  static ULONG WINAPI file_scheme_handler_Release(IMFSchemeHandler *iface)
  {
      struct file_scheme_handler *handler = impl_from_IMFSchemeHandler(iface);
      ULONG refcount = InterlockedDecrement(&handler->refcount);
      struct file_scheme_handler_result *result, *next;
  
      TRACE("%p, refcount %u.\n", iface, refcount);
  
      if (!refcount)
      {
          LIST_FOR_EACH_ENTRY_SAFE(result, next, &handler->results, struct file_scheme_handler_result, entry)
          {
              list_remove(&result->entry);
              IMFAsyncResult_Release(result->result);
              if (result->object)
                  IUnknown_Release(result->object);
              heap_free(result);
          }
          DeleteCriticalSection(&handler->cs);
          if (handler->resolver)
              IMFSourceResolver_Release(handler->resolver);
          heap_free(handler);
      }
  
      return refcount;
  }
  
  struct create_object_context
  {
      IUnknown IUnknown_iface;
      LONG refcount;
  
      IPropertyStore *props;
      WCHAR *url;
      DWORD flags;
  };
  
  static struct create_object_context *impl_from_IUnknown(IUnknown *iface)
  {
      return CONTAINING_RECORD(iface, struct create_object_context, IUnknown_iface);
  }
  
  static HRESULT WINAPI create_object_context_QueryInterface(IUnknown *iface, REFIID riid, void **obj)
  {
      TRACE("%p, %s, %p.\n", iface, debugstr_guid(riid), obj);
  
      if (IsEqualIID(riid, &IID_IUnknown))
      {
          *obj = iface;
          IUnknown_AddRef(iface);
          return S_OK;
      }
  
      WARN("Unsupported %s.\n", debugstr_guid(riid));
      *obj = NULL;
      return E_NOINTERFACE;
  }
  
  static ULONG WINAPI create_object_context_AddRef(IUnknown *iface)
  {
      struct create_object_context *context = impl_from_IUnknown(iface);
      ULONG refcount = InterlockedIncrement(&context->refcount);
  
      TRACE("%p, refcount %u.\n", iface, refcount);
  
      return refcount;
  }
  
  static ULONG WINAPI create_object_context_Release(IUnknown *iface)
  {
      struct create_object_context *context = impl_from_IUnknown(iface);
      ULONG refcount = InterlockedDecrement(&context->refcount);
  
      TRACE("%p, refcount %u.\n", iface, refcount);
  
      if (!refcount)
      {
          if (context->props)
              IPropertyStore_Release(context->props);
          heap_free(context->url);
          heap_free(context);
      }
  
      return refcount;
  }
  
  static const IUnknownVtbl create_object_context_vtbl =
  {
      create_object_context_QueryInterface,
      create_object_context_AddRef,
      create_object_context_Release,
  };
  
  static WCHAR *heap_strdupW(const WCHAR *str)
  {
      WCHAR *ret = NULL;
  
      if (str)
      {
          unsigned int size;
  
          size = (lstrlenW(str) + 1) * sizeof(WCHAR);
          ret = heap_alloc(size);
          if (ret)
              memcpy(ret, str, size);
      }
  
      return ret;
  }
  
  static HRESULT WINAPI file_scheme_handler_BeginCreateObject(IMFSchemeHandler *iface, const WCHAR *url, DWORD flags,
          IPropertyStore *props, IUnknown **cancel_cookie, IMFAsyncCallback *callback, IUnknown *state)
  {
      struct file_scheme_handler *handler = impl_from_IMFSchemeHandler(iface);
      struct create_object_context *context;
      IMFAsyncResult *caller, *item;
      HRESULT hr;
  
      TRACE("%p, %s, %#x, %p, %p, %p, %p.\n", iface, debugstr_w(url), flags, props, cancel_cookie, callback, state);
  
      if (cancel_cookie)
          *cancel_cookie = NULL;
  
      if (FAILED(hr = MFCreateAsyncResult(NULL, callback, state, &caller)))
          return hr;
  
      context = heap_alloc(sizeof(*context));
      if (!context)
      {
          IMFAsyncResult_Release(caller);
          return E_OUTOFMEMORY;
      }
  
      context->IUnknown_iface.lpVtbl = &create_object_context_vtbl;
      context->refcount = 1;
      context->props = props;
      if (context->props)
          IPropertyStore_AddRef(context->props);
      context->flags = flags;
      context->url = heap_strdupW(url);
      if (!context->url)
      {
          IMFAsyncResult_Release(caller);
          IUnknown_Release(&context->IUnknown_iface);
          return E_OUTOFMEMORY;
      }
  
      hr = MFCreateAsyncResult(&context->IUnknown_iface, &handler->IMFAsyncCallback_iface, (IUnknown *)caller, &item);
      IUnknown_Release(&context->IUnknown_iface);
      IMFAsyncResult_Release(caller);
      if (SUCCEEDED(hr))
      {
          if (SUCCEEDED(hr = MFPutWorkItemEx(MFASYNC_CALLBACK_QUEUE_IO, item)))
          {
              if (cancel_cookie)
                  IMFAsyncResult_GetState(item, cancel_cookie);
          }
  
          IMFAsyncResult_Release(item);
      }
  
      return hr;
  }
  
  static HRESULT WINAPI file_scheme_handler_EndCreateObject(IMFSchemeHandler *iface, IMFAsyncResult *result,
          MF_OBJECT_TYPE *obj_type, IUnknown **object)
  {
      struct file_scheme_handler *handler = impl_from_IMFSchemeHandler(iface);
      struct file_scheme_handler_result *found = NULL, *cur;
      HRESULT hr;
  
      TRACE("%p, %p, %p, %p.\n", iface, result, obj_type, object);
  
      EnterCriticalSection(&handler->cs);
  
      LIST_FOR_EACH_ENTRY(cur, &handler->results, struct file_scheme_handler_result, entry)
      {
          if (result == cur->result)
          {
              list_remove(&cur->entry);
              found = cur;
              break;
          }
      }
  
      LeaveCriticalSection(&handler->cs);
  
      if (found)
      {
          *obj_type = found->obj_type;
          *object = found->object;
          hr = IMFAsyncResult_GetStatus(found->result);
          IMFAsyncResult_Release(found->result);
          heap_free(found);
      }
      else
      {
          *obj_type = MF_OBJECT_INVALID;
          *object = NULL;
          hr = MF_E_UNEXPECTED;
      }
  
      return hr;
  }
  
  static HRESULT WINAPI file_scheme_handler_CancelObjectCreation(IMFSchemeHandler *iface, IUnknown *cancel_cookie)
  {
      struct file_scheme_handler *handler = impl_from_IMFSchemeHandler(iface);
      struct file_scheme_handler_result *found = NULL, *cur;
  
      TRACE("%p, %p.\n", iface, cancel_cookie);
  
      EnterCriticalSection(&handler->cs);
  
      LIST_FOR_EACH_ENTRY(cur, &handler->results, struct file_scheme_handler_result, entry)
      {
          if (cancel_cookie == (IUnknown *)cur->result)
          {
              list_remove(&cur->entry);
              found = cur;
              break;
          }
      }
  
      LeaveCriticalSection(&handler->cs);
  
      if (found)
      {
          IMFAsyncResult_Release(found->result);
          if (found->object)
              IUnknown_Release(found->object);
          heap_free(found);
      }
  
      return found ? S_OK : MF_E_UNEXPECTED;
  }
  
  static const IMFSchemeHandlerVtbl file_scheme_handler_vtbl =
  {
      file_scheme_handler_QueryInterface,
      file_scheme_handler_AddRef,
      file_scheme_handler_Release,
      file_scheme_handler_BeginCreateObject,
      file_scheme_handler_EndCreateObject,
      file_scheme_handler_CancelObjectCreation,
  };
  
  static HRESULT WINAPI file_scheme_handler_callback_QueryInterface(IMFAsyncCallback *iface, REFIID riid, void **obj)
  {
      if (IsEqualIID(riid, &IID_IMFAsyncCallback) ||
              IsEqualIID(riid, &IID_IUnknown))
      {
          *obj = iface;
          IMFAsyncCallback_AddRef(iface);
          return S_OK;
      }
  
      WARN("Unsupported %s.\n", debugstr_guid(riid));
      *obj = NULL;
      return E_NOINTERFACE;
  }
  
  static ULONG WINAPI file_scheme_handler_callback_AddRef(IMFAsyncCallback *iface)
  {
      struct file_scheme_handler *handler = impl_from_IMFAsyncCallback(iface);
      return IMFSchemeHandler_AddRef(&handler->IMFSchemeHandler_iface);
  }
  
  static ULONG WINAPI file_scheme_handler_callback_Release(IMFAsyncCallback *iface)
  {
      struct file_scheme_handler *handler = impl_from_IMFAsyncCallback(iface);
      return IMFSchemeHandler_Release(&handler->IMFSchemeHandler_iface);
  }
  
  static HRESULT WINAPI file_scheme_handler_callback_GetParameters(IMFAsyncCallback *iface, DWORD *flags, DWORD *queue)
  {
      return E_NOTIMPL;
  }
  
  static HRESULT file_scheme_handler_get_resolver(struct file_scheme_handler *handler, IMFSourceResolver **resolver)
  {
      HRESULT hr;
  
      if (!handler->resolver)
      {
          IMFSourceResolver *resolver;
  
          if (FAILED(hr = MFCreateSourceResolver(&resolver)))
              return hr;
  
          if (InterlockedCompareExchangePointer((void **)&handler->resolver, resolver, NULL))
              IMFSourceResolver_Release(resolver);
      }
  
      *resolver = handler->resolver;
      IMFSourceResolver_AddRef(*resolver);
  
      return S_OK;
  }
  
  static HRESULT WINAPI file_scheme_handler_callback_Invoke(IMFAsyncCallback *iface, IMFAsyncResult *result)
  {
      static const WCHAR schemeW[] = {'f','i','l','e',':','/','/'};
      struct file_scheme_handler *handler = impl_from_IMFAsyncCallback(iface);
      struct file_scheme_handler_result *handler_result;
      MF_OBJECT_TYPE obj_type = MF_OBJECT_INVALID;
      IUnknown *object = NULL, *context_object;
      struct create_object_context *context;
      IMFSourceResolver *resolver;
      IMFAsyncResult *caller;
      IMFByteStream *stream;
      const WCHAR *url;
      HRESULT hr;
  
      caller = (IMFAsyncResult *)IMFAsyncResult_GetStateNoAddRef(result);
  
      if (FAILED(hr = IMFAsyncResult_GetObject(result, &context_object)))
      {
          WARN("Expected context set for callee result.\n");
          return hr;
      }
  
      context = impl_from_IUnknown(context_object);
  
      /* Strip from scheme, MFCreateFile() won't be expecting it. */
      url = context->url;
      if (!wcsnicmp(context->url, schemeW, ARRAY_SIZE(schemeW)))
          url += ARRAY_SIZE(schemeW);
  
      hr = MFCreateFile(context->flags & MF_RESOLUTION_WRITE ? MF_ACCESSMODE_READWRITE : MF_ACCESSMODE_READ,
              MF_OPENMODE_FAIL_IF_NOT_EXIST, MF_FILEFLAGS_NONE, url, &stream);
      if (SUCCEEDED(hr))
      {
          if (context->flags & MF_RESOLUTION_MEDIASOURCE)
          {
              if (SUCCEEDED(hr = file_scheme_handler_get_resolver(handler, &resolver)))
              {
                  hr = IMFSourceResolver_CreateObjectFromByteStream(resolver, stream, context->url, context->flags,
                          context->props, &obj_type, &object);
                  IMFSourceResolver_Release(resolver);
                  IMFByteStream_Release(stream);
              }
          }
          else
          {
              object = (IUnknown *)stream;
              obj_type = MF_OBJECT_BYTESTREAM;
          }
      }
  
      handler_result = heap_alloc(sizeof(*handler_result));
      if (handler_result)
      {
          handler_result->result = caller;
          IMFAsyncResult_AddRef(handler_result->result);
          handler_result->obj_type = obj_type;
          handler_result->object = object;
  
          EnterCriticalSection(&handler->cs);
          list_add_tail(&handler->results, &handler_result->entry);
          LeaveCriticalSection(&handler->cs);
      }
      else
      {
          if (object)
              IUnknown_Release(object);
          hr = E_OUTOFMEMORY;
      }
  
      IUnknown_Release(&context->IUnknown_iface);
  
      IMFAsyncResult_SetStatus(caller, hr);
      MFInvokeCallback(caller);
  
      return S_OK;
  }
  
  static const IMFAsyncCallbackVtbl file_scheme_handler_callback_vtbl =
  {
      file_scheme_handler_callback_QueryInterface,
      file_scheme_handler_callback_AddRef,
      file_scheme_handler_callback_Release,
      file_scheme_handler_callback_GetParameters,
      file_scheme_handler_callback_Invoke,
  };
  
  static HRESULT file_scheme_handler_construct(REFIID riid, void **obj)
  {
      struct file_scheme_handler *handler;
      HRESULT hr;
  
      TRACE("%s, %p.\n", debugstr_guid(riid), obj);
  
      handler = heap_alloc_zero(sizeof(*handler));
      if (!handler)
          return E_OUTOFMEMORY;
  
      handler->IMFSchemeHandler_iface.lpVtbl = &file_scheme_handler_vtbl;
      handler->IMFAsyncCallback_iface.lpVtbl = &file_scheme_handler_callback_vtbl;
      handler->refcount = 1;
      list_init(&handler->results);
      InitializeCriticalSection(&handler->cs);
  
      hr = IMFSchemeHandler_QueryInterface(&handler->IMFSchemeHandler_iface, riid, obj);
      IMFSchemeHandler_Release(&handler->IMFSchemeHandler_iface);
  
      return hr;
  }
  
  static struct class_factory file_scheme_handler_factory = { { &class_factory_vtbl }, file_scheme_handler_construct };
  
  static const struct class_object
  {
      const GUID *clsid;
      IClassFactory *factory;
  }
  class_objects[] =
  {
      { &CLSID_FileSchemePlugin, &file_scheme_handler_factory.IClassFactory_iface },
  };
  
  /*******************************************************************************
   *      DllGetClassObject (mf.@)
   */
  HRESULT WINAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, void **obj)
  {
      unsigned int i;
  
      TRACE("%s, %s, %p.\n", debugstr_guid(rclsid), debugstr_guid(riid), obj);
  
      for (i = 0; i < ARRAY_SIZE(class_objects); ++i)
      {
          if (IsEqualGUID(class_objects[i].clsid, rclsid))
              return IClassFactory_QueryInterface(class_objects[i].factory, riid, obj);
      }
  
      WARN("%s: class not found.\n", debugstr_guid(rclsid));
      return CLASS_E_CLASSNOTAVAILABLE;
  }
  
  /******************************************************************
   *              DllCanUnloadNow (mf.@)
   */
  HRESULT WINAPI DllCanUnloadNow(void)
  {
      return S_FALSE;
  }
  
  /***********************************************************************
   *          DllRegisterServer (mf.@)
   */
  HRESULT WINAPI DllRegisterServer(void)
  {
      return __wine_register_resources( mf_instance );
  }
  
  /***********************************************************************
   *          DllUnregisterServer (mf.@)
   */
  HRESULT WINAPI DllUnregisterServer(void)
  {
      return __wine_unregister_resources( mf_instance );
  }
  
  BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, LPVOID reserved)
  {
      switch (reason)
      {
          case DLL_WINE_PREATTACH:
              return FALSE;    /* prefer native version */
          case DLL_PROCESS_ATTACH:
              mf_instance = instance;
              DisableThreadLibraryCalls(instance);
              break;
      }
  
      return TRUE;
  }
  
  /***********************************************************************
   *      MFGetSupportedMimeTypes (mf.@)
   */
  HRESULT WINAPI MFGetSupportedMimeTypes(PROPVARIANT *array)
  {
      FIXME("(%p) stub\n", array);
  
      return E_NOTIMPL;
  }
  
  /***********************************************************************
   *      MFGetService (mf.@)
   */
  HRESULT WINAPI MFGetService(IUnknown *object, REFGUID service, REFIID riid, void **obj)
  {
      IMFGetService *gs;
      HRESULT hr;
  
      TRACE("(%p, %s, %s, %p)\n", object, debugstr_guid(service), debugstr_guid(riid), obj);
  
      if (!object)
          return E_POINTER;
  
      if (FAILED(hr = IUnknown_QueryInterface(object, &IID_IMFGetService, (void **)&gs)))
          return hr;
  
      hr = IMFGetService_GetService(gs, service, riid, obj);
      IMFGetService_Release(gs);
      return hr;
  }
  
  /***********************************************************************
   *      MFShutdownObject (mf.@)
   */
  HRESULT WINAPI MFShutdownObject(IUnknown *object)
  {
      IMFShutdown *shutdown;
  
      TRACE("%p.\n", object);
  
      if (object && SUCCEEDED(IUnknown_QueryInterface(object, &IID_IMFShutdown, (void **)&shutdown)))
      {
          IMFShutdown_Shutdown(shutdown);
          IMFShutdown_Release(shutdown);
      }
  
      return S_OK;
  }
  
  /***********************************************************************
   *      MFEnumDeviceSources (mf.@)
   */
  HRESULT WINAPI MFEnumDeviceSources(IMFAttributes *attributes, IMFActivate ***sources, UINT32 *count)
  {
      FIXME("%p, %p, %p.\n", attributes, sources, count);
  
      if (!attributes || !sources || !count)
          return E_INVALIDARG;
  
      *count = 0;
  
      return S_OK;
  }
  
  static HRESULT evr_create_object(IMFAttributes *attributes, void *user_context, IUnknown **obj)
  {
      FIXME("%p, %p, %p.\n", attributes, user_context, obj);
  
      return E_NOTIMPL;
  }
  
  static void evr_free_private(void *user_context)
  {
  }
  
  static const struct activate_funcs evr_activate_funcs =
  {
      evr_create_object,
      evr_free_private,
  };
  
  HRESULT WINAPI MFCreateVideoRendererActivate(HWND hwnd, IMFActivate **activate)
  {
      TRACE("%p, %p.\n", hwnd, activate);
  
      return create_activation_object(hwnd, &evr_activate_funcs, activate);
  }
  