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
44 struct AVFilterContext;
48 /** @class FilterGraph
49 * @brief A graph of FFmpeg filters.
54 FilterGraph() = default;
55 virtual ~FilterGraph ();
57 FilterGraph (FilterGraph const&) = delete;
58 FilterGraph& operator== (FilterGraph const&) = delete;
60 void setup(std::vector<Filter> const&);
61 AVFilterContext* get (std::string name);
64 virtual std::string src_parameters () const = 0;
65 virtual std::string src_name () const = 0;
66 virtual void set_parameters (AVFilterContext* context) const = 0;
67 virtual std::string sink_name () const = 0;
69 AVFilterGraph* _graph = nullptr;
70 /** true if this graph has no filters in, so it just copies stuff straight through */
72 AVFilterContext* _buffer_src_context = nullptr;
73 AVFilterContext* _buffer_sink_context = nullptr;
74 AVFrame* _frame = nullptr;