VideoFilter.h

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// ----------------------------------------------------------------------------
// -                        CloudViewer: www.cloudViewer.org                  -
// ----------------------------------------------------------------------------
// Copyright (c) 2018-2024 www.cloudViewer.org
// SPDX-License-Identifier: MIT
// ----------------------------------------------------------------------------
// ----------------------------------------------------------------------------
// Contains source code from
// https://github.com/mpromonet/webrtc-streamer
//
// This software is in the public domain, furnished "as is", without technical
// support, and with no warranty, express or implied, as to its usefulness for
// any purpose.
// ----------------------------------------------------------------------------
//
// This is a private header. It shall be hidden from CloudViewer's public API.
// Do not put this in CloudViewer.h.in.
 
#pragma once
 
#include <pc/video_track_source.h>
 
#include "visualization/webrtc_server/BitmapTrackSource.h"
 
namespace cloudViewer {
namespace visualization {
namespace webrtc_server {
 
template <class T>
class VideoFilter : public BitmapTrackSource {
public:
    static rtc::scoped_refptr<VideoFilter> Create(
            rtc::scoped_refptr<BitmapTrackSourceInterface> video_source,
            const std::map<std::string, std::string>& opts) {
        std::unique_ptr<T> source = absl::WrapUnique(new T(video_source, opts));
        if (!source) {
            return nullptr;
        }
        return new rtc::RefCountedObject<VideoFilter>(std::move(source));
    }
 
protected:
    explicit VideoFilter(std::unique_ptr<T> source)
        : BitmapTrackSource(/*remote=*/false), source_(std::move(source)) {}
 
    SourceState state() const override { return kLive; }
    bool GetStats(Stats* stats) override {
        bool result = false;
        T* source = source_.get();
        if (source) {
            stats->input_height = source->height();
            stats->input_width = source->width();
            result = true;
        }
        return result;
    }
 
private:
    rtc::VideoSourceInterface<webrtc::VideoFrame>* source() override {
        return source_.get();
    }
    std::unique_ptr<T> source_;
};
 
}  // namespace webrtc_server
}  // namespace visualization
}  // namespace cloudViewer