text: /*
   * Copyright 2019 Nikolay Sivov for CodeWeavers
   *
   * 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
   */
  
  #define COBJMACROS
  
  #include "mfapi.h"
  #include "mfidl.h"
  #include "mferror.h"
  #include "mf_private.h"
  
  #include "wine/debug.h"
  #include "wine/heap.h"
  
  WINE_DEFAULT_DEBUG_CHANNEL(mfplat);
  
  enum sink_state
  {
      SINK_STATE_STOPPED = 0,
      SINK_STATE_RUNNING,
  };
  
  struct sample_grabber;
  
  struct sample_grabber_stream
  {
      IMFStreamSink IMFStreamSink_iface;
      IMFMediaTypeHandler IMFMediaTypeHandler_iface;
      LONG refcount;
      struct sample_grabber *sink;
      IMFMediaEventQueue *event_queue;
  };
  
  struct sample_grabber
  {
      IMFMediaSink IMFMediaSink_iface;
      IMFClockStateSink IMFClockStateSink_iface;
      IMFMediaEventGenerator IMFMediaEventGenerator_iface;
      LONG refcount;
      IMFSampleGrabberSinkCallback *callback;
      IMFMediaType *media_type;
      BOOL is_shut_down;
      struct sample_grabber_stream *stream;
      IMFMediaEventQueue *event_queue;
      IMFPresentationClock *clock;
      enum sink_state state;
      UINT32 ignore_clock;
      CRITICAL_SECTION cs;
  };
  
  struct sample_grabber_activate_context
  {
      IMFMediaType *media_type;
      IMFSampleGrabberSinkCallback *callback;
  };
  
  static void sample_grabber_free_private(void *user_context)
  {
      struct sample_grabber_activate_context *context = user_context;
      IMFMediaType_Release(context->media_type);
      IMFSampleGrabberSinkCallback_Release(context->callback);
      heap_free(context);
  }
  
  static struct sample_grabber *impl_from_IMFMediaSink(IMFMediaSink *iface)
  {
      return CONTAINING_RECORD(iface, struct sample_grabber, IMFMediaSink_iface);
  }
  
  static struct sample_grabber *impl_from_IMFClockStateSink(IMFClockStateSink *iface)
  {
      return CONTAINING_RECORD(iface, struct sample_grabber, IMFClockStateSink_iface);
  }
  
  static struct sample_grabber *impl_from_IMFMediaEventGenerator(IMFMediaEventGenerator *iface)
  {
      return CONTAINING_RECORD(iface, struct sample_grabber, IMFMediaEventGenerator_iface);
  }
  
  static struct sample_grabber_stream *impl_from_IMFStreamSink(IMFStreamSink *iface)
  {
      return CONTAINING_RECORD(iface, struct sample_grabber_stream, IMFStreamSink_iface);
  }
  
  static struct sample_grabber_stream *impl_from_IMFMediaTypeHandler(IMFMediaTypeHandler *iface)
  {
      return CONTAINING_RECORD(iface, struct sample_grabber_stream, IMFMediaTypeHandler_iface);
  }
  
  static HRESULT WINAPI sample_grabber_stream_QueryInterface(IMFStreamSink *iface, REFIID riid, void **obj)
  {
      struct sample_grabber_stream *stream = impl_from_IMFStreamSink(iface);
  
      TRACE("%p, %s, %p.\n", iface, debugstr_guid(riid), obj);
  
      if (IsEqualIID(riid, &IID_IMFStreamSink) ||
              IsEqualIID(riid, &IID_IUnknown))
      {
          *obj = &stream->IMFStreamSink_iface;
      }
      else if (IsEqualIID(riid, &IID_IMFMediaTypeHandler))
      {
          *obj = &stream->IMFMediaTypeHandler_iface;
      }
      else
      {
          WARN("Unsupported %s.\n", debugstr_guid(riid));
          *obj = NULL;
          return E_NOINTERFACE;
      }
  
      IUnknown_AddRef((IUnknown *)*obj);
  
      return S_OK;
  }
  
  static ULONG WINAPI sample_grabber_stream_AddRef(IMFStreamSink *iface)
  {
      struct sample_grabber_stream *stream = impl_from_IMFStreamSink(iface);
      ULONG refcount = InterlockedIncrement(&stream->refcount);
  
      TRACE("%p, refcount %u.\n", iface, refcount);
  
      return refcount;
  }
  
  static ULONG WINAPI sample_grabber_stream_Release(IMFStreamSink *iface)
  {
      struct sample_grabber_stream *stream = impl_from_IMFStreamSink(iface);
      ULONG refcount = InterlockedDecrement(&stream->refcount);
  
      TRACE("%p, refcount %u.\n", iface, refcount);
  
      if (!refcount)
      {
          if (stream->sink)
              IMFMediaSink_Release(&stream->sink->IMFMediaSink_iface);
          if (stream->event_queue)
          {
              IMFMediaEventQueue_Shutdown(stream->event_queue);
              IMFMediaEventQueue_Release(stream->event_queue);
          }
          heap_free(stream);
      }
  
      return refcount;
  }
  
  static HRESULT WINAPI sample_grabber_stream_GetEvent(IMFStreamSink *iface, DWORD flags, IMFMediaEvent **event)
  {
      struct sample_grabber_stream *stream = impl_from_IMFStreamSink(iface);
  
      TRACE("%p, %#x, %p.\n", iface, flags, event);
  
      return IMFMediaEventQueue_GetEvent(stream->event_queue, flags, event);
  }
  
  static HRESULT WINAPI sample_grabber_stream_BeginGetEvent(IMFStreamSink *iface, IMFAsyncCallback *callback,
          IUnknown *state)
  {
      struct sample_grabber_stream *stream = impl_from_IMFStreamSink(iface);
  
      TRACE("%p, %p, %p.\n", iface, callback, state);
  
      return IMFMediaEventQueue_BeginGetEvent(stream->event_queue, callback, state);
  }
  
  static HRESULT WINAPI sample_grabber_stream_EndGetEvent(IMFStreamSink *iface, IMFAsyncResult *result,
          IMFMediaEvent **event)
  {
      struct sample_grabber_stream *stream = impl_from_IMFStreamSink(iface);
  
      TRACE("%p, %p, %p.\n", iface, result, event);
  
      return IMFMediaEventQueue_EndGetEvent(stream->event_queue, result, event);
  }
  
  static HRESULT WINAPI sample_grabber_stream_QueueEvent(IMFStreamSink *iface, MediaEventType event_type,
          REFGUID ext_type, HRESULT hr, const PROPVARIANT *value)
  {
      struct sample_grabber_stream *stream = impl_from_IMFStreamSink(iface);
  
      TRACE("%p, %u, %s, %#x, %p.\n", iface, event_type, debugstr_guid(ext_type), hr, value);
  
      return IMFMediaEventQueue_QueueEventParamVar(stream->event_queue, event_type, ext_type, hr, value);
  }
  
  static HRESULT WINAPI sample_grabber_stream_GetMediaSink(IMFStreamSink *iface, IMFMediaSink **sink)
  {
      struct sample_grabber_stream *stream = impl_from_IMFStreamSink(iface);
  
      TRACE("%p, %p.\n", iface, sink);
  
      if (!stream->sink)
          return MF_E_STREAMSINK_REMOVED;
  
      *sink = &stream->sink->IMFMediaSink_iface;
      IMFMediaSink_AddRef(*sink);
  
      return S_OK;
  }
  
  static HRESULT WINAPI sample_grabber_stream_GetIdentifier(IMFStreamSink *iface, DWORD *identifier)
  {
      struct sample_grabber_stream *stream = impl_from_IMFStreamSink(iface);
  
      TRACE("%p, %p.\n", iface, identifier);
  
      if (!stream->sink)
          return MF_E_STREAMSINK_REMOVED;
  
      *identifier = 0;
  
      return S_OK;
  }
  
  static HRESULT WINAPI sample_grabber_stream_GetMediaTypeHandler(IMFStreamSink *iface, IMFMediaTypeHandler **handler)
  {
      struct sample_grabber_stream *stream = impl_from_IMFStreamSink(iface);
  
      TRACE("%p, %p.\n", iface, handler);
  
      if (!handler)
          return E_POINTER;
  
      if (!stream->sink)
          return MF_E_STREAMSINK_REMOVED;
  
      *handler = &stream->IMFMediaTypeHandler_iface;
      IMFMediaTypeHandler_AddRef(*handler);
  
      return S_OK;
  }
  
  static HRESULT sample_grabber_report_sample(struct sample_grabber *grabber, IMFSample *sample)
  {
      LONGLONG sample_time, sample_duration = 0;
      IMFMediaBuffer *buffer;
      DWORD flags, size;
      GUID major_type;
      BYTE *data;
      HRESULT hr;
  
      hr = IMFMediaType_GetMajorType(grabber->media_type, &major_type);
  
      if (SUCCEEDED(hr))
          hr = IMFSample_GetSampleTime(sample, &sample_time);
  
      if (FAILED(IMFSample_GetSampleDuration(sample, &sample_duration)))
          sample_duration = 0;
  
      if (SUCCEEDED(hr))
          hr = IMFSample_GetSampleFlags(sample, &flags);
  
      if (SUCCEEDED(hr))
      {
          if (FAILED(IMFSample_ConvertToContiguousBuffer(sample, &buffer)))
              return E_UNEXPECTED;
  
          if (SUCCEEDED(hr = IMFMediaBuffer_Lock(buffer, &data, NULL, &size)))
          {
              hr = IMFSampleGrabberSinkCallback_OnProcessSample(grabber->callback, &major_type, flags, sample_time,
                          sample_duration, data, size);
              IMFMediaBuffer_Unlock(buffer);
          }
  
          IMFMediaBuffer_Release(buffer);
      }
  
      return hr;
  }
  
  static HRESULT WINAPI sample_grabber_stream_ProcessSample(IMFStreamSink *iface, IMFSample *sample)
  {
      struct sample_grabber_stream *stream = impl_from_IMFStreamSink(iface);
      LONGLONG sampletime;
      HRESULT hr = S_OK;
  
      TRACE("%p, %p.\n", iface, sample);
  
      if (!sample)
          return S_OK;
  
      if (!stream->sink)
          return MF_E_STREAMSINK_REMOVED;
  
      EnterCriticalSection(&stream->sink->cs);
  
      if (stream->sink->state == SINK_STATE_RUNNING)
      {
          hr = IMFSample_GetSampleTime(sample, &sampletime);
  
          if (SUCCEEDED(hr))
          {
              if (stream->sink->ignore_clock)
                  hr = sample_grabber_report_sample(stream->sink, sample);
              else
                  FIXME("Sample scheduling is not implemented.\n");
          }
      }
  
      LeaveCriticalSection(&stream->sink->cs);
  
      return hr;
  }
  
  static HRESULT WINAPI sample_grabber_stream_PlaceMarker(IMFStreamSink *iface, MFSTREAMSINK_MARKER_TYPE marker_type,
          const PROPVARIANT *marker_value, const PROPVARIANT *context_value)
  {
      FIXME("%p, %d, %p, %p.\n", iface, marker_type, marker_value, context_value);
  
      return E_NOTIMPL;
  }
  
  static HRESULT WINAPI sample_grabber_stream_Flush(IMFStreamSink *iface)
  {
      FIXME("%p.\n", iface);
  
      return E_NOTIMPL;
  }
  
  static const IMFStreamSinkVtbl sample_grabber_stream_vtbl =
  {
      sample_grabber_stream_QueryInterface,
      sample_grabber_stream_AddRef,
      sample_grabber_stream_Release,
      sample_grabber_stream_GetEvent,
      sample_grabber_stream_BeginGetEvent,
      sample_grabber_stream_EndGetEvent,
      sample_grabber_stream_QueueEvent,
      sample_grabber_stream_GetMediaSink,
      sample_grabber_stream_GetIdentifier,
      sample_grabber_stream_GetMediaTypeHandler,
      sample_grabber_stream_ProcessSample,
      sample_grabber_stream_PlaceMarker,
      sample_grabber_stream_Flush,
  };
  
  static HRESULT WINAPI sample_grabber_stream_type_handler_QueryInterface(IMFMediaTypeHandler *iface, REFIID riid,
          void **obj)
  {
      struct sample_grabber_stream *stream = impl_from_IMFMediaTypeHandler(iface);
      return IMFStreamSink_QueryInterface(&stream->IMFStreamSink_iface, riid, obj);
  }
  
  static ULONG WINAPI sample_grabber_stream_type_handler_AddRef(IMFMediaTypeHandler *iface)
  {
      struct sample_grabber_stream *stream = impl_from_IMFMediaTypeHandler(iface);
      return IMFStreamSink_AddRef(&stream->IMFStreamSink_iface);
  }
  
  static ULONG WINAPI sample_grabber_stream_type_handler_Release(IMFMediaTypeHandler *iface)
  {
      struct sample_grabber_stream *stream = impl_from_IMFMediaTypeHandler(iface);
      return IMFStreamSink_Release(&stream->IMFStreamSink_iface);
  }
  
  static HRESULT WINAPI sample_grabber_stream_type_handler_IsMediaTypeSupported(IMFMediaTypeHandler *iface,
          IMFMediaType *in_type, IMFMediaType **out_type)
  {
      struct sample_grabber_stream *stream = impl_from_IMFMediaTypeHandler(iface);
      const DWORD supported_flags = MF_MEDIATYPE_EQUAL_MAJOR_TYPES | MF_MEDIATYPE_EQUAL_FORMAT_TYPES;
      DWORD flags;
  
      TRACE("%p, %p, %p.\n", iface, in_type, out_type);
  
      if (!stream->sink)
          return MF_E_STREAMSINK_REMOVED;
  
      if (!in_type)
          return E_POINTER;
  
      if (IMFMediaType_IsEqual(stream->sink->media_type, in_type, &flags) == S_OK)
          return S_OK;
  
      return (flags & supported_flags) == supported_flags ? S_OK : MF_E_INVALIDMEDIATYPE;
  }
  
  static HRESULT WINAPI sample_grabber_stream_type_handler_GetMediaTypeCount(IMFMediaTypeHandler *iface, DWORD *count)
  {
      TRACE("%p, %p.\n", iface, count);
  
      if (!count)
          return E_POINTER;
  
      *count = 0;
  
      return S_OK;
  }
  
  static HRESULT WINAPI sample_grabber_stream_type_handler_GetMediaTypeByIndex(IMFMediaTypeHandler *iface, DWORD index,
          IMFMediaType **media_type)
  {
      TRACE("%p, %u, %p.\n", iface, index, media_type);
  
      if (!media_type)
          return E_POINTER;
  
      return MF_E_NO_MORE_TYPES;
  }
  
  static HRESULT WINAPI sample_grabber_stream_type_handler_SetCurrentMediaType(IMFMediaTypeHandler *iface,
          IMFMediaType *media_type)
  {
      struct sample_grabber_stream *stream = impl_from_IMFMediaTypeHandler(iface);
  
      TRACE("%p, %p.\n", iface, media_type);
  
      if (!media_type)
          return E_POINTER;
  
      if (!stream->sink)
          return MF_E_STREAMSINK_REMOVED;
  
      IMFMediaType_Release(stream->sink->media_type);
      stream->sink->media_type = media_type;
      IMFMediaType_AddRef(stream->sink->media_type);
  
      return S_OK;
  }
  
  static HRESULT WINAPI sample_grabber_stream_type_handler_GetCurrentMediaType(IMFMediaTypeHandler *iface,
          IMFMediaType **media_type)
  {
      struct sample_grabber_stream *stream = impl_from_IMFMediaTypeHandler(iface);
  
      TRACE("%p, %p.\n", iface, media_type);
  
      if (!media_type)
          return E_POINTER;
  
      if (!stream->sink)
          return MF_E_STREAMSINK_REMOVED;
  
      *media_type = stream->sink->media_type;
      IMFMediaType_AddRef(*media_type);
  
      return S_OK;
  }
  
  static HRESULT WINAPI sample_grabber_stream_type_handler_GetMajorType(IMFMediaTypeHandler *iface, GUID *type)
  {
      struct sample_grabber_stream *stream = impl_from_IMFMediaTypeHandler(iface);
  
      TRACE("%p, %p.\n", iface, type);
  
      if (!type)
          return E_POINTER;
  
      if (!stream->sink)
          return MF_E_STREAMSINK_REMOVED;
  
      return IMFMediaType_GetMajorType(stream->sink->media_type, type);
  }
  
  static const IMFMediaTypeHandlerVtbl sample_grabber_stream_type_handler_vtbl =
  {
      sample_grabber_stream_type_handler_QueryInterface,
      sample_grabber_stream_type_handler_AddRef,
      sample_grabber_stream_type_handler_Release,
      sample_grabber_stream_type_handler_IsMediaTypeSupported,
      sample_grabber_stream_type_handler_GetMediaTypeCount,
      sample_grabber_stream_type_handler_GetMediaTypeByIndex,
      sample_grabber_stream_type_handler_SetCurrentMediaType,
      sample_grabber_stream_type_handler_GetCurrentMediaType,
      sample_grabber_stream_type_handler_GetMajorType,
  };
  
  static HRESULT WINAPI sample_grabber_sink_QueryInterface(IMFMediaSink *iface, REFIID riid, void **obj)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaSink(iface);
  
      TRACE("%p, %s, %p.\n", iface, debugstr_guid(riid), obj);
  
      if (IsEqualIID(riid, &IID_IMFMediaSink) ||
              IsEqualIID(riid, &IID_IUnknown))
      {
          *obj = &grabber->IMFMediaSink_iface;
      }
      else if (IsEqualIID(riid, &IID_IMFClockStateSink))
      {
          *obj = &grabber->IMFClockStateSink_iface;
      }
      else if (IsEqualIID(riid, &IID_IMFMediaEventGenerator))
      {
          *obj = &grabber->IMFMediaEventGenerator_iface;
      }
      else
      {
          WARN("Unsupported %s.\n", debugstr_guid(riid));
          *obj = NULL;
          return E_NOINTERFACE;
      }
  
      IUnknown_AddRef((IUnknown *)*obj);
  
      return S_OK;
  }
  
  static ULONG WINAPI sample_grabber_sink_AddRef(IMFMediaSink *iface)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaSink(iface);
      ULONG refcount = InterlockedIncrement(&grabber->refcount);
  
      TRACE("%p, refcount %u.\n", iface, refcount);
  
      return refcount;
  }
  
  static ULONG WINAPI sample_grabber_sink_Release(IMFMediaSink *iface)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaSink(iface);
      ULONG refcount = InterlockedDecrement(&grabber->refcount);
  
      TRACE("%p, refcount %u.\n", iface, refcount);
  
      if (!refcount)
      {
          IMFSampleGrabberSinkCallback_Release(grabber->callback);
          IMFMediaType_Release(grabber->media_type);
          if (grabber->event_queue)
          {
              IMFMediaEventQueue_Shutdown(grabber->event_queue);
              IMFMediaEventQueue_Release(grabber->event_queue);
          }
          if (grabber->clock)
              IMFPresentationClock_Release(grabber->clock);
          DeleteCriticalSection(&grabber->cs);
          heap_free(grabber);
      }
  
      return refcount;
  }
  
  static HRESULT WINAPI sample_grabber_sink_GetCharacteristics(IMFMediaSink *iface, DWORD *flags)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaSink(iface);
  
      TRACE("%p, %p.\n", iface, flags);
  
      if (grabber->is_shut_down)
          return MF_E_SHUTDOWN;
  
      *flags = MEDIASINK_FIXED_STREAMS;
  
      return S_OK;
  }
  
  static HRESULT WINAPI sample_grabber_sink_AddStreamSink(IMFMediaSink *iface, DWORD stream_sink_id,
      IMFMediaType *media_type, IMFStreamSink **stream_sink)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaSink(iface);
  
      TRACE("%p, %#x, %p, %p.\n", iface, stream_sink_id, media_type, stream_sink);
  
      return grabber->is_shut_down ? MF_E_SHUTDOWN : MF_E_STREAMSINKS_FIXED;
  }
  
  static HRESULT WINAPI sample_grabber_sink_RemoveStreamSink(IMFMediaSink *iface, DWORD stream_sink_id)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaSink(iface);
  
      TRACE("%p, %#x.\n", iface, stream_sink_id);
  
      return grabber->is_shut_down ? MF_E_SHUTDOWN : MF_E_STREAMSINKS_FIXED;
  }
  
  static HRESULT WINAPI sample_grabber_sink_GetStreamSinkCount(IMFMediaSink *iface, DWORD *count)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaSink(iface);
  
      TRACE("%p, %p.\n", iface, count);
  
      if (grabber->is_shut_down)
          return MF_E_SHUTDOWN;
  
      *count = 1;
  
      return S_OK;
  }
  
  static HRESULT WINAPI sample_grabber_sink_GetStreamSinkByIndex(IMFMediaSink *iface, DWORD index,
          IMFStreamSink **stream)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaSink(iface);
      HRESULT hr = S_OK;
  
      TRACE("%p, %u, %p.\n", iface, index, stream);
  
      if (grabber->is_shut_down)
          return MF_E_SHUTDOWN;
  
      EnterCriticalSection(&grabber->cs);
  
      if (grabber->is_shut_down)
          hr = MF_E_SHUTDOWN;
      else if (index > 0)
          hr = MF_E_INVALIDINDEX;
      else
      {
         *stream = &grabber->stream->IMFStreamSink_iface;
         IMFStreamSink_AddRef(*stream);
      }
  
      LeaveCriticalSection(&grabber->cs);
  
      return hr;
  }
  
  static HRESULT WINAPI sample_grabber_sink_GetStreamSinkById(IMFMediaSink *iface, DWORD stream_sink_id,
          IMFStreamSink **stream)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaSink(iface);
      HRESULT hr = S_OK;
  
      TRACE("%p, %#x, %p.\n", iface, stream_sink_id, stream);
  
      EnterCriticalSection(&grabber->cs);
  
      if (grabber->is_shut_down)
          hr = MF_E_SHUTDOWN;
      else if (stream_sink_id > 0)
          hr = MF_E_INVALIDSTREAMNUMBER;
      else
      {
          *stream = &grabber->stream->IMFStreamSink_iface;
          IMFStreamSink_AddRef(*stream);
      }
  
      LeaveCriticalSection(&grabber->cs);
  
      return hr;
  }
  
  static HRESULT WINAPI sample_grabber_sink_SetPresentationClock(IMFMediaSink *iface, IMFPresentationClock *clock)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaSink(iface);
      HRESULT hr;
  
      TRACE("%p, %p.\n", iface, clock);
  
      EnterCriticalSection(&grabber->cs);
  
      if (SUCCEEDED(hr = IMFSampleGrabberSinkCallback_OnSetPresentationClock(grabber->callback, clock)))
      {
          if (grabber->clock)
          {
              IMFPresentationClock_RemoveClockStateSink(grabber->clock, &grabber->IMFClockStateSink_iface);
              IMFPresentationClock_Release(grabber->clock);
          }
          grabber->clock = clock;
          if (grabber->clock)
          {
              IMFPresentationClock_AddRef(grabber->clock);
              IMFPresentationClock_AddClockStateSink(grabber->clock, &grabber->IMFClockStateSink_iface);
          }
      }
  
      LeaveCriticalSection(&grabber->cs);
  
      return hr;
  }
  
  static HRESULT WINAPI sample_grabber_sink_GetPresentationClock(IMFMediaSink *iface, IMFPresentationClock **clock)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaSink(iface);
      HRESULT hr = S_OK;
  
      TRACE("%p, %p.\n", iface, clock);
  
      if (!clock)
          return E_POINTER;
  
      EnterCriticalSection(&grabber->cs);
  
      if (grabber->clock)
      {
          *clock = grabber->clock;
          IMFPresentationClock_AddRef(*clock);
      }
      else
          hr = MF_E_NO_CLOCK;
  
      LeaveCriticalSection(&grabber->cs);
  
      return hr;
  }
  
  static HRESULT WINAPI sample_grabber_sink_Shutdown(IMFMediaSink *iface)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaSink(iface);
      HRESULT hr;
  
      TRACE("%p.\n", iface);
  
      if (grabber->is_shut_down)
          return MF_E_SHUTDOWN;
  
      EnterCriticalSection(&grabber->cs);
      grabber->is_shut_down = TRUE;
      if (SUCCEEDED(hr = IMFSampleGrabberSinkCallback_OnShutdown(grabber->callback)))
      {
          IMFMediaSink_Release(&grabber->stream->sink->IMFMediaSink_iface);
          grabber->stream->sink = NULL;
          IMFStreamSink_Release(&grabber->stream->IMFStreamSink_iface);
          grabber->stream = NULL;
      }
      EnterCriticalSection(&grabber->cs);
  
      return hr;
  }
  
  static const IMFMediaSinkVtbl sample_grabber_sink_vtbl =
  {
      sample_grabber_sink_QueryInterface,
      sample_grabber_sink_AddRef,
      sample_grabber_sink_Release,
      sample_grabber_sink_GetCharacteristics,
      sample_grabber_sink_AddStreamSink,
      sample_grabber_sink_RemoveStreamSink,
      sample_grabber_sink_GetStreamSinkCount,
      sample_grabber_sink_GetStreamSinkByIndex,
      sample_grabber_sink_GetStreamSinkById,
      sample_grabber_sink_SetPresentationClock,
      sample_grabber_sink_GetPresentationClock,
      sample_grabber_sink_Shutdown,
  };
  
  static HRESULT WINAPI sample_grabber_clock_sink_QueryInterface(IMFClockStateSink *iface, REFIID riid, void **obj)
  {
      struct sample_grabber *grabber = impl_from_IMFClockStateSink(iface);
      return IMFMediaSink_QueryInterface(&grabber->IMFMediaSink_iface, riid, obj);
  }
  
  static ULONG WINAPI sample_grabber_clock_sink_AddRef(IMFClockStateSink *iface)
  {
      struct sample_grabber *grabber = impl_from_IMFClockStateSink(iface);
      return IMFMediaSink_AddRef(&grabber->IMFMediaSink_iface);
  }
  
  static ULONG WINAPI sample_grabber_clock_sink_Release(IMFClockStateSink *iface)
  {
      struct sample_grabber *grabber = impl_from_IMFClockStateSink(iface);
      return IMFMediaSink_Release(&grabber->IMFMediaSink_iface);
  }
  
  static void sample_grabber_set_state(struct sample_grabber *grabber, enum sink_state state)
  {
      static const DWORD events[] =
      {
          MEStreamSinkStopped, /* SINK_STATE_STOPPED */
          MEStreamSinkStarted, /* SINK_STATE_RUNNING */
      };
      BOOL set_state = FALSE;
  
      EnterCriticalSection(&grabber->cs);
  
      switch (grabber->state)
      {
          case SINK_STATE_STOPPED:
              set_state = state == SINK_STATE_RUNNING;
              break;
          case SINK_STATE_RUNNING:
              set_state = state == SINK_STATE_STOPPED;
              break;
          default:
              ;
      }
  
      if (set_state)
      {
          grabber->state = state;
          if (grabber->stream)
              IMFStreamSink_QueueEvent(&grabber->stream->IMFStreamSink_iface, events[state], &GUID_NULL, S_OK, NULL);
      }
  
      LeaveCriticalSection(&grabber->cs);
  }
  
  static HRESULT WINAPI sample_grabber_clock_sink_OnClockStart(IMFClockStateSink *iface, MFTIME systime, LONGLONG offset)
  {
      struct sample_grabber *grabber = impl_from_IMFClockStateSink(iface);
  
      TRACE("%p, %s, %s.\n", iface, wine_dbgstr_longlong(systime), wine_dbgstr_longlong(offset));
  
      sample_grabber_set_state(grabber, SINK_STATE_RUNNING);
  
      return S_OK;
  }
  
  static HRESULT WINAPI sample_grabber_clock_sink_OnClockStop(IMFClockStateSink *iface, MFTIME systime)
  {
      struct sample_grabber *grabber = impl_from_IMFClockStateSink(iface);
  
      TRACE("%p, %s.\n", iface, wine_dbgstr_longlong(systime));
  
      sample_grabber_set_state(grabber, SINK_STATE_STOPPED);
  
      return S_OK;
  }
  
  static HRESULT WINAPI sample_grabber_clock_sink_OnClockPause(IMFClockStateSink *iface, MFTIME systime)
  {
      TRACE("%p, %s.\n", iface, wine_dbgstr_longlong(systime));
  
      return S_OK;
  }
  
  static HRESULT WINAPI sample_grabber_clock_sink_OnClockRestart(IMFClockStateSink *iface, MFTIME systime)
  {
      struct sample_grabber *grabber = impl_from_IMFClockStateSink(iface);
  
      TRACE("%p, %s.\n", iface, wine_dbgstr_longlong(systime));
  
      sample_grabber_set_state(grabber, SINK_STATE_RUNNING);
  
      return S_OK;
  }
  
  static HRESULT WINAPI sample_grabber_clock_sink_OnClockSetRate(IMFClockStateSink *iface, MFTIME systime, float rate)
  {
      FIXME("%p, %s, %f.\n", iface, wine_dbgstr_longlong(systime), rate);
  
      return E_NOTIMPL;
  }
  
  static HRESULT WINAPI sample_grabber_events_QueryInterface(IMFMediaEventGenerator *iface, REFIID riid, void **obj)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaEventGenerator(iface);
      return IMFMediaSink_QueryInterface(&grabber->IMFMediaSink_iface, riid, obj);
  }
  
  static ULONG WINAPI sample_grabber_events_AddRef(IMFMediaEventGenerator *iface)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaEventGenerator(iface);
      return IMFMediaSink_AddRef(&grabber->IMFMediaSink_iface);
  }
  
  static ULONG WINAPI sample_grabber_events_Release(IMFMediaEventGenerator *iface)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaEventGenerator(iface);
      return IMFMediaSink_Release(&grabber->IMFMediaSink_iface);
  }
  
  static HRESULT WINAPI sample_grabber_events_GetEvent(IMFMediaEventGenerator *iface, DWORD flags, IMFMediaEvent **event)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaEventGenerator(iface);
  
      TRACE("%p, %#x, %p.\n", iface, flags, event);
  
      return IMFMediaEventQueue_GetEvent(grabber->event_queue, flags, event);
  }
  
  static HRESULT WINAPI sample_grabber_events_BeginGetEvent(IMFMediaEventGenerator *iface, IMFAsyncCallback *callback,
          IUnknown *state)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaEventGenerator(iface);
  
      TRACE("%p, %p, %p.\n", iface, callback, state);
  
      return IMFMediaEventQueue_BeginGetEvent(grabber->event_queue, callback, state);
  }
  
  static HRESULT WINAPI sample_grabber_events_EndGetEvent(IMFMediaEventGenerator *iface, IMFAsyncResult *result,
          IMFMediaEvent **event)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaEventGenerator(iface);
  
      TRACE("%p, %p, %p.\n", iface, result, event);
  
      return IMFMediaEventQueue_EndGetEvent(grabber->event_queue, result, event);
  }
  
  static HRESULT WINAPI sample_grabber_events_QueueEvent(IMFMediaEventGenerator *iface, MediaEventType event_type,
          REFGUID ext_type, HRESULT hr, const PROPVARIANT *value)
  {
      struct sample_grabber *grabber = impl_from_IMFMediaEventGenerator(iface);
  
      TRACE("%p, %u, %s, %#x, %p.\n", iface, event_type, debugstr_guid(ext_type), hr, value);
  
      return IMFMediaEventQueue_QueueEventParamVar(grabber->event_queue, event_type, ext_type, hr, value);
  }
  
  static const IMFMediaEventGeneratorVtbl sample_grabber_sink_events_vtbl =
  {
      sample_grabber_events_QueryInterface,
      sample_grabber_events_AddRef,
      sample_grabber_events_Release,
      sample_grabber_events_GetEvent,
      sample_grabber_events_BeginGetEvent,
      sample_grabber_events_EndGetEvent,
      sample_grabber_events_QueueEvent,
  };
  
  static const IMFClockStateSinkVtbl sample_grabber_clock_sink_vtbl =
  {
      sample_grabber_clock_sink_QueryInterface,
      sample_grabber_clock_sink_AddRef,
      sample_grabber_clock_sink_Release,
      sample_grabber_clock_sink_OnClockStart,
      sample_grabber_clock_sink_OnClockStop,
      sample_grabber_clock_sink_OnClockPause,
      sample_grabber_clock_sink_OnClockRestart,
      sample_grabber_clock_sink_OnClockSetRate,
  };
  
  static HRESULT sample_grabber_create_stream(struct sample_grabber *sink, struct sample_grabber_stream **stream)
  {
      struct sample_grabber_stream *object;
      HRESULT hr;
  
      object = heap_alloc_zero(sizeof(*object));
      if (!object)
          return E_OUTOFMEMORY;
  
      object->IMFStreamSink_iface.lpVtbl = &sample_grabber_stream_vtbl;
      object->IMFMediaTypeHandler_iface.lpVtbl = &sample_grabber_stream_type_handler_vtbl;
      object->refcount = 1;
      object->sink = sink;
      IMFMediaSink_AddRef(&object->sink->IMFMediaSink_iface);
  
      if (FAILED(hr = MFCreateEventQueue(&object->event_queue)))
          goto failed;
  
      *stream = object;
  
      return S_OK;
  
  failed:
      IMFStreamSink_Release(&object->IMFStreamSink_iface);
  
      return hr;
  }
  
  static HRESULT sample_grabber_create_object(IMFAttributes *attributes, void *user_context, IUnknown **obj)
  {
      struct sample_grabber_activate_context *context = user_context;
      struct sample_grabber *object;
      HRESULT hr;
      GUID guid;
  
      TRACE("%p, %p, %p.\n", attributes, user_context, obj);
  
      /* At least major type is required. */
      if (FAILED(IMFMediaType_GetMajorType(context->media_type, &guid)))
          return MF_E_INVALIDMEDIATYPE;
  
      object = heap_alloc_zero(sizeof(*object));
      if (!object)
          return E_OUTOFMEMORY;
  
      object->IMFMediaSink_iface.lpVtbl = &sample_grabber_sink_vtbl;
      object->IMFClockStateSink_iface.lpVtbl = &sample_grabber_clock_sink_vtbl;
      object->IMFMediaEventGenerator_iface.lpVtbl = &sample_grabber_sink_events_vtbl;
      object->refcount = 1;
      object->callback = context->callback;
      IMFSampleGrabberSinkCallback_AddRef(object->callback);
      object->media_type = context->media_type;
      IMFMediaType_AddRef(object->media_type);
      IMFAttributes_GetUINT32(attributes, &MF_SAMPLEGRABBERSINK_IGNORE_CLOCK, &object->ignore_clock);
      InitializeCriticalSection(&object->cs);
  
      if (FAILED(hr = sample_grabber_create_stream(object, &object->stream)))
          goto failed;
  
      if (FAILED(hr = MFCreateEventQueue(&object->event_queue)))
          goto failed;
  
      *obj = (IUnknown *)&object->IMFMediaSink_iface;
  
      TRACE("Created %p.\n", *obj);
  
      return S_OK;
  
  failed:
  
      IMFMediaSink_Release(&object->IMFMediaSink_iface);
  
      return hr;
  }
  
  static const struct activate_funcs sample_grabber_activate_funcs =
  {
      sample_grabber_create_object,
      sample_grabber_free_private,
  };
  
  /***********************************************************************
   *      MFCreateSampleGrabberSinkActivate (mf.@)
   */
  HRESULT WINAPI MFCreateSampleGrabberSinkActivate(IMFMediaType *media_type, IMFSampleGrabberSinkCallback *callback,
          IMFActivate **activate)
  {
      struct sample_grabber_activate_context *context;
      HRESULT hr;
  
      TRACE("%p, %p, %p.\n", media_type, callback, activate);
  
      if (!media_type || !callback || !activate)
          return E_POINTER;
  
      context = heap_alloc_zero(sizeof(*context));
      if (!context)
          return E_OUTOFMEMORY;
  
      context->media_type = media_type;
      IMFMediaType_AddRef(context->media_type);
      context->callback = callback;
      IMFSampleGrabberSinkCallback_AddRef(context->callback);
  
      if (FAILED(hr = create_activation_object(context, &sample_grabber_activate_funcs, activate)))
          sample_grabber_free_private(context);
  
      return hr;
  }
  