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/*
Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file src/lib/filter_graph.h
* @brief A graph of FFmpeg filters.
*/
#ifndef DCPOMATIC_FILTER_GRAPH_H
#define DCPOMATIC_FILTER_GRAPH_H
#include "filter.h"
#include <dcp/warnings.h>
LIBDCP_DISABLE_WARNINGS
extern "C" {
#include <libavfilter/buffersink.h>
}
LIBDCP_ENABLE_WARNINGS
#include <string>
#include <vector>
class Filter;
class Image;
struct AVFilterContext;
struct AVFrame;
/** @class FilterGraph
* @brief A graph of FFmpeg filters.
*/
class FilterGraph
{
public:
FilterGraph() = default;
virtual ~FilterGraph ();
FilterGraph (FilterGraph const&) = delete;
FilterGraph& operator== (FilterGraph const&) = delete;
void setup(std::vector<Filter> const&);
AVFilterContext* get (std::string name);
protected:
virtual std::string src_parameters () const = 0;
virtual std::string src_name () const = 0;
virtual void set_parameters (AVFilterContext* context) const = 0;
virtual std::string sink_name () const = 0;
AVFilterGraph* _graph = nullptr;
/** true if this graph has no filters in, so it just copies stuff straight through */
bool _copy = true;
AVFilterContext* _buffer_src_context = nullptr;
AVFilterContext* _buffer_sink_context = nullptr;
AVFrame* _frame = nullptr;
};
#endif
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