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//
// Copyright © 2020 Arm Ltd and Contributors. All rights reserved.
// SPDX-License-Identifier: MIT
//
#pragma once
#include "IFrameReader.hpp"
#include <opencv2/opencv.hpp>
namespace common
{
class CvVideoFrameReader :
public IFrameReader<cv::Mat>
{
public:
/**
* @brief Default constructor.
*
* Underlying open cv video capture object will be instantiated.
*/
CvVideoFrameReader() = default;
~CvVideoFrameReader() override = default;
/**
*@brief Initialises reader to capture frames from video file.
*
* @param source path to the video file or image sequence.
*
* @throws std::runtime_error if init failed
*/
void Init(const std::string& source);
std::shared_ptr <cv::Mat> ReadFrame() override;
bool IsExhausted(const std::shared_ptr <cv::Mat>& frame) const override;
/**
* Returns effective video frame width supported by the source/set by the user.
* Must be called after Init method.
* @return frame width
*/
int GetSourceWidth() const;
/**
* Returns effective video frame height supported by the source/set by the user.
* Must be called after Init method.
* @return frame height
*/
int GetSourceHeight() const;
/**
* Returns effective fps value supported by the source/set by the user.
* @return fps value
*/
double GetSourceFps() const;
/**
* Will query OpenCV to convert images to RGB
* Copy is actually default behaviour, but the set function needs to be called
* in order to know whether OpenCV supports conversion from our source format.
* @return boolean,
* true: OpenCV returns RGB
* false: OpenCV returns the fourcc format from GetSourceEncoding
*/
bool ConvertToRGB();
/**
* Returns 4-character code of codec.
* @return codec name
*/
std::string GetSourceEncoding() const;
/**
* Get the fourcc int from its string name.
* @return codec int
*/
int GetSourceEncodingInt() const;
int GetFrameCount() const;
private:
cv::VideoCapture m_capture;
void CheckIsOpen(const std::string& source);
};
class CvVideoFrameReaderRgbWrapper :
public IFrameReader<cv::Mat>
{
public:
CvVideoFrameReaderRgbWrapper() = delete;
CvVideoFrameReaderRgbWrapper(const CvVideoFrameReaderRgbWrapper& o) = delete;
CvVideoFrameReaderRgbWrapper(CvVideoFrameReaderRgbWrapper&& o) = delete;
CvVideoFrameReaderRgbWrapper(std::unique_ptr<common::CvVideoFrameReader> reader);
std::shared_ptr<cv::Mat> ReadFrame() override;
bool IsExhausted(const std::shared_ptr<cv::Mat>& frame) const override;
private:
std::unique_ptr<common::CvVideoFrameReader> m_reader;
};
}// namespace common
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