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8a75411ec5
We don't grab stream_cs to change any variables checked here, except to reset
flush_event, and that cannot result in a deadlock.
The only possible deadlocks here are:
(1) between this function and EndOfStream(), which is correct, as the two
should presumably be serialized;
(2) between this function and EndFlush(); however, in that case we expect
BeginFlush() first, which will unblock the streaming thread.
Signed-off-by: Zebediah Figura <z.figura12@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
104 lines
3.2 KiB
C
104 lines
3.2 KiB
C
/*
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* Null renderer filter
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*
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* Copyright 2004 Christian Costa
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* Copyright 2008 Maarten Lankhorst
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#define COBJMACROS
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#include "dshow.h"
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#include "wine/debug.h"
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#include "wine/strmbase.h"
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WINE_DEFAULT_DEBUG_CHANNEL(qedit);
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struct null_renderer
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{
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struct strmbase_renderer renderer;
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HANDLE run_event;
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};
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static struct null_renderer *impl_from_strmbase_renderer(struct strmbase_renderer *iface)
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{
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return CONTAINING_RECORD(iface, struct null_renderer, renderer);
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}
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static HRESULT WINAPI NullRenderer_DoRenderSample(struct strmbase_renderer *iface, IMediaSample *sample)
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{
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struct null_renderer *filter = impl_from_strmbase_renderer(iface);
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if (filter->renderer.filter.state == State_Paused)
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{
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const HANDLE events[2] = {filter->run_event, filter->renderer.flush_event};
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SetEvent(filter->renderer.state_event);
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WaitForMultipleObjects(2, events, FALSE, INFINITE);
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}
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return S_OK;
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}
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static HRESULT WINAPI NullRenderer_CheckMediaType(struct strmbase_renderer *iface, const AM_MEDIA_TYPE *mt)
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{
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TRACE("Not a stub!\n");
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return S_OK;
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}
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static void null_renderer_destroy(struct strmbase_renderer *iface)
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{
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struct null_renderer *filter = impl_from_strmbase_renderer(iface);
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CloseHandle(filter->run_event);
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strmbase_renderer_cleanup(&filter->renderer);
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free(filter);
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}
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static void null_renderer_start_stream(struct strmbase_renderer *iface)
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{
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struct null_renderer *filter = impl_from_strmbase_renderer(iface);
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SetEvent(filter->run_event);
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}
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static void null_renderer_stop_stream(struct strmbase_renderer *iface)
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{
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struct null_renderer *filter = impl_from_strmbase_renderer(iface);
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ResetEvent(filter->run_event);
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}
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static const struct strmbase_renderer_ops renderer_ops =
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{
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.pfnCheckMediaType = NullRenderer_CheckMediaType,
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.pfnDoRenderSample = NullRenderer_DoRenderSample,
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.renderer_start_stream = null_renderer_start_stream,
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.renderer_stop_stream = null_renderer_stop_stream,
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.renderer_destroy = null_renderer_destroy,
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};
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HRESULT null_renderer_create(IUnknown *outer, IUnknown **out)
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{
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struct null_renderer *object;
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if (!(object = calloc(1, sizeof(*object))))
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return E_OUTOFMEMORY;
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strmbase_renderer_init(&object->renderer, outer, &CLSID_NullRenderer, L"In", &renderer_ops);
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object->run_event = CreateEventW(NULL, TRUE, FALSE, NULL);
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TRACE("Created null renderer %p.\n", object);
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*out = &object->renderer.filter.IUnknown_inner;
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return S_OK;
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}
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