dlls/qedit/nullrenderer.c

   1 /*
   2  * Null renderer filter
   3  *
   4  * Copyright 2004 Christian Costa
   5  * Copyright 2008 Maarten Lankhorst
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #define COBJMACROS
  23 #include "dshow.h"
  24 #include "wine/debug.h"
  25 #include "wine/strmbase.h"
  26
  27 WINE_DEFAULT_DEBUG_CHANNEL(qedit);
  28
  29 struct null_renderer
  30 {
  31     struct strmbase_renderer renderer;
  32     HANDLE run_event;
  33 };
  34
  35 static struct null_renderer *impl_from_strmbase_renderer(struct strmbase_renderer *iface)
  36 {
  37     return CONTAINING_RECORD(iface, struct null_renderer, renderer);
  38 }
  39
  40 static HRESULT WINAPI NullRenderer_DoRenderSample(struct strmbase_renderer *iface, IMediaSample *sample)
  41 {
  42     struct null_renderer *filter = impl_from_strmbase_renderer(iface);
  43
  44     if (filter->renderer.filter.state == State_Paused)
  45     {
  46         const HANDLE events[2] = {filter->run_event, filter->renderer.flush_event};
  47
  48         SetEvent(filter->renderer.state_event);
  49         WaitForMultipleObjects(2, events, FALSE, INFINITE);
  50     }
  51
  52     return S_OK;
  53 }
  54
  55 static HRESULT WINAPI NullRenderer_CheckMediaType(struct strmbase_renderer *iface, const AM_MEDIA_TYPE *mt)
  56 {
  57     TRACE("Not a stub!\n");
  58     return S_OK;
  59 }
  60
  61 static void null_renderer_destroy(struct strmbase_renderer *iface)
  62 {
  63     struct null_renderer *filter = impl_from_strmbase_renderer(iface);
  64
  65     CloseHandle(filter->run_event);
  66     strmbase_renderer_cleanup(&filter->renderer);
  67     free(filter);
  68 }
  69
  70 static void null_renderer_start_stream(struct strmbase_renderer *iface)
  71 {
  72     struct null_renderer *filter = impl_from_strmbase_renderer(iface);
  73     SetEvent(filter->run_event);
  74 }
  75
  76 static void null_renderer_stop_stream(struct strmbase_renderer *iface)
  77 {
  78     struct null_renderer *filter = impl_from_strmbase_renderer(iface);
  79     ResetEvent(filter->run_event);
  80 }
  81
  82 static const struct strmbase_renderer_ops renderer_ops =
  83 {
  84     .pfnCheckMediaType = NullRenderer_CheckMediaType,
  85     .pfnDoRenderSample = NullRenderer_DoRenderSample,
  86     .renderer_start_stream = null_renderer_start_stream,
  87     .renderer_stop_stream = null_renderer_stop_stream,
  88     .renderer_destroy = null_renderer_destroy,
  89 };
  90
  91 HRESULT null_renderer_create(IUnknown *outer, IUnknown **out)
  92 {
  93     struct null_renderer *object;
  94
  95     if (!(object = calloc(1, sizeof(*object))))
  96         return E_OUTOFMEMORY;
  97
  98     strmbase_renderer_init(&object->renderer, outer, &CLSID_NullRenderer, L"In", &renderer_ops);
  99     object->run_event = CreateEventW(NULL, TRUE, FALSE, NULL);
 100
 101     TRACE("Created null renderer %p.\n", object);
 102     *out = &object->renderer.filter.IUnknown_inner;
 103     return S_OK;
 104 }