Éanna Ó Catháin | 919c14e | 2020-09-14 17:36:49 +0100 | [diff] [blame] | 1 | // |
| 2 | // Copyright © 2020 Arm Ltd and Contributors. All rights reserved. |
| 3 | // SPDX-License-Identifier: MIT |
| 4 | // |
| 5 | #pragma once |
| 6 | |
| 7 | |
| 8 | #include "IFrameReader.hpp" |
| 9 | #include <opencv2/opencv.hpp> |
| 10 | |
| 11 | namespace od |
| 12 | { |
| 13 | |
| 14 | class CvVideoFrameReader : |
| 15 | public IFrameReader<cv::Mat> |
| 16 | { |
| 17 | public: |
| 18 | /** |
| 19 | * @brief Default constructor. |
| 20 | * |
| 21 | * Underlying open cv video capture object will be instantiated. |
| 22 | */ |
| 23 | CvVideoFrameReader() = default; |
| 24 | |
| 25 | ~CvVideoFrameReader() override = default; |
| 26 | |
| 27 | /** |
| 28 | *@brief Initialises reader to capture frames from video file. |
| 29 | * |
| 30 | * @param source path to the video file or image sequence. |
| 31 | * |
| 32 | * @throws std::runtime_error if init failed |
| 33 | */ |
| 34 | void Init(const std::string& source); |
| 35 | |
| 36 | std::shared_ptr <cv::Mat> ReadFrame() override; |
| 37 | |
| 38 | bool IsExhausted(const std::shared_ptr <cv::Mat>& frame) const override; |
| 39 | |
| 40 | /** |
| 41 | * Returns effective video frame width supported by the source/set by the user. |
| 42 | * Must be called after Init method. |
| 43 | * @return frame width |
| 44 | */ |
| 45 | int GetSourceWidth() const; |
| 46 | |
| 47 | /** |
| 48 | * Returns effective video frame height supported by the source/set by the user. |
| 49 | * Must be called after Init method. |
| 50 | * @return frame height |
| 51 | */ |
| 52 | int GetSourceHeight() const; |
| 53 | |
| 54 | /** |
| 55 | * Returns effective fps value supported by the source/set by the user. |
| 56 | * @return fps value |
| 57 | */ |
| 58 | double GetSourceFps() const; |
| 59 | |
| 60 | /** |
| 61 | * Will query OpenCV to convert images to RGB |
| 62 | * Copy is actually default behaviour, but the set function needs to be called |
| 63 | * in order to know whether OpenCV supports conversion from our source format. |
| 64 | * @return boolean, |
| 65 | * true: OpenCV returns RGB |
| 66 | * false: OpenCV returns the fourcc format from GetSourceEncoding |
| 67 | */ |
| 68 | bool ConvertToRGB(); |
| 69 | |
| 70 | /** |
| 71 | * Returns 4-character code of codec. |
| 72 | * @return codec name |
| 73 | */ |
| 74 | std::string GetSourceEncoding() const; |
| 75 | |
| 76 | /** |
| 77 | * Get the fourcc int from its string name. |
| 78 | * @return codec int |
| 79 | */ |
| 80 | int GetSourceEncodingInt() const; |
| 81 | |
| 82 | int GetFrameCount() const; |
| 83 | |
| 84 | private: |
| 85 | cv::VideoCapture m_capture; |
| 86 | |
| 87 | void CheckIsOpen(const std::string& source); |
| 88 | }; |
| 89 | |
| 90 | class CvVideoFrameReaderRgbWrapper : |
| 91 | public IFrameReader<cv::Mat> |
| 92 | { |
| 93 | public: |
| 94 | CvVideoFrameReaderRgbWrapper() = delete; |
| 95 | CvVideoFrameReaderRgbWrapper(const CvVideoFrameReaderRgbWrapper& o) = delete; |
| 96 | CvVideoFrameReaderRgbWrapper(CvVideoFrameReaderRgbWrapper&& o) = delete; |
| 97 | |
| 98 | CvVideoFrameReaderRgbWrapper(std::unique_ptr<od::CvVideoFrameReader> reader); |
| 99 | |
| 100 | std::shared_ptr<cv::Mat> ReadFrame() override; |
| 101 | |
| 102 | bool IsExhausted(const std::shared_ptr<cv::Mat>& frame) const override; |
| 103 | |
| 104 | private: |
| 105 | std::unique_ptr<od::CvVideoFrameReader> m_reader; |
| 106 | }; |
| 107 | |
| 108 | }// namespace od |