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 };
  33
  34 static struct null_renderer *impl_from_strmbase_renderer(struct strmbase_renderer *iface)
  35 {
  36     return CONTAINING_RECORD(iface, struct null_renderer, renderer);
  37 }
  38
  39 static HRESULT null_renderer_render(struct strmbase_renderer *iface, IMediaSample *sample)
  40 {
  41     return S_OK;
  42 }
  43
  44 static HRESULT null_renderer_query_accept(struct strmbase_renderer *iface, const AM_MEDIA_TYPE *mt)
  45 {
  46     return S_OK;
  47 }
  48
  49 static void null_renderer_destroy(struct strmbase_renderer *iface)
  50 {
  51     struct null_renderer *filter = impl_from_strmbase_renderer(iface);
  52
  53     strmbase_renderer_cleanup(&filter->renderer);
  54     free(filter);
  55 }
  56
  57 static const struct strmbase_renderer_ops renderer_ops =
  58 {
  59     .renderer_query_accept = null_renderer_query_accept,
  60     .renderer_render = null_renderer_render,
  61     .renderer_destroy = null_renderer_destroy,
  62 };
  63
  64 HRESULT null_renderer_create(IUnknown *outer, IUnknown **out)
  65 {
  66     struct null_renderer *object;
  67
  68     if (!(object = calloc(1, sizeof(*object))))
  69         return E_OUTOFMEMORY;
  70
  71     strmbase_renderer_init(&object->renderer, outer, &CLSID_NullRenderer, L"In", &renderer_ops);
  72
  73     TRACE("Created null renderer %p.\n", object);
  74     *out = &object->renderer.filter.IUnknown_inner;
  75     return S_OK;
  76 }