2 Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
4 This file is part of DCP-o-matic.
6 DCP-o-matic is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 DCP-o-matic is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
22 /** @file src/lib/filter_graph.h
23 * @brief A graph of FFmpeg filters.
27 #ifndef DCPOMATIC_FILTER_GRAPH_H
28 #define DCPOMATIC_FILTER_GRAPH_H
32 #include <dcp/warnings.h>
33 LIBDCP_DISABLE_WARNINGS
35 #include <libavfilter/buffersink.h>
37 LIBDCP_ENABLE_WARNINGS
40 struct AVFilterContext;
46 /** @class FilterGraph
47 * @brief A graph of FFmpeg filters.
52 FilterGraph() = default;
53 virtual ~FilterGraph ();
55 FilterGraph (FilterGraph const&) = delete;
56 FilterGraph& operator== (FilterGraph const&) = delete;
58 void setup (std::vector<Filter const *>);
59 AVFilterContext* get (std::string name);
62 virtual std::string src_parameters () const = 0;
63 virtual std::string src_name () const = 0;
64 virtual void set_parameters (AVFilterContext* context) const = 0;
65 virtual std::string sink_name () const = 0;
67 AVFilterGraph* _graph = nullptr;
68 /** true if this graph has no filters in, so it just copies stuff straight through */
70 AVFilterContext* _buffer_src_context = nullptr;
71 AVFilterContext* _buffer_sink_context = nullptr;
72 AVFrame* _frame = nullptr;