media_filter.h

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/*
 *  Copyright (C) 2004-2026 Savoir-faire Linux Inc.
 *
 *  This program 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
 */
#pragma once
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "media_stream.h"
#include "noncopyable.h"
#include "video/video_base.h"
 
#include <string>
#include <vector>
 
extern "C" {
struct AVFilterContext;
struct AVFilterGraph;
struct AVFilterInOut;
}
 
namespace jami {
 
class MediaFilter
{
public:
    MediaFilter();
    ~MediaFilter();
 
    std::string getFilterDesc() const;
 
    int initialize(const std::string& filterDesc, const std::vector<MediaStream>& msps);
 
    bool needsReinitForNewStream(const std::string& name) const;
 
    const MediaStream& getInputParams(const std::string& inputName) const;
 
    MediaStream getOutputParams() const;
 
    int feedInput(AVFrame* frame, const std::string& inputName);
 
    std::unique_ptr<MediaFrame> readOutput();
 
    void flush();
 
private:
    NON_COPYABLE(MediaFilter);
 
    int initOutputFilter(AVFilterInOut* out);
 
    int initInputFilter(AVFilterInOut* in, const MediaStream& msp);
 
    int reinitialize();
 
    int fail(std::string_view msg, int err) const;
 
    void clean();
 
    AVFilterGraph* graph_ = nullptr;
 
    AVFilterContext* output_ = nullptr;
 
    std::vector<AVFilterContext*> inputs_;
 
    std::vector<MediaStream> inputParams_;
 
    std::string desc_ {};
 
    bool initialized_ {false};
};
 
}; // namespace jami