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Merge pull request #2 from vietanhdev/feature/video_capture
Feature: Video capture
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| #ifndef CUSTOMCHAR_VISION_VIDEO_CAPTURE_H_ | ||
| #define CUSTOMCHAR_VISION_VIDEO_CAPTURE_H_ | ||
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| #include <queue> | ||
| #include <string> | ||
| #include <thread> | ||
| #include <vector> | ||
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| #include <opencv2/opencv.hpp> | ||
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| namespace CC { | ||
| namespace vision { | ||
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| class VideoCapture { | ||
| private: | ||
| int device_id_; | ||
| bool is_capturing_; | ||
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| cv::VideoCapture capture_; | ||
| std::mutex capture_mutex_; | ||
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| cv::Mat frame_; | ||
| std::mutex frame_mutex_; | ||
| std::thread capture_thread_; | ||
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| /// @brief Start capturing frames from device | ||
| bool StartDevice() { | ||
| capture_ = cv::VideoCapture(device_id_); | ||
| if (!capture_.isOpened()) { | ||
| std::cerr << "Error opening video stream or file" << std::endl; | ||
| return false; | ||
| } else { | ||
| return true; | ||
| } | ||
| } | ||
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| /// @brief Stop capturing frames from device | ||
| void StopDevice() { | ||
| if (capture_.isOpened()) capture_.release(); | ||
| } | ||
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| public: | ||
| VideoCapture() {} | ||
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| /// @brief Get frame width | ||
| /// @return int | ||
| int GetFrameWidth() { | ||
| std::lock_guard<std::mutex> lock(frame_mutex_); | ||
| return frame_.cols; | ||
| } | ||
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| /// @brief Get frame height | ||
| /// @return int | ||
| int GetFrameHeight() { | ||
| std::lock_guard<std::mutex> lock(frame_mutex_); | ||
| return frame_.rows; | ||
| } | ||
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| /// @brief Capture frames from camera | ||
| void Capture() { | ||
| cv::Mat frame; | ||
| while (true) { | ||
| { | ||
| std::lock_guard<std::mutex> lock(capture_mutex_); | ||
| if (!is_capturing_) { | ||
| break; | ||
| } | ||
| capture_ >> frame; | ||
| } | ||
| if (frame.empty()) { | ||
| break; | ||
| } | ||
| std::lock_guard<std::mutex> lock(frame_mutex_); | ||
| frame_ = frame.clone(); | ||
| } | ||
| } | ||
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| /// @brief Start capturing frames | ||
| void Start() { | ||
| { | ||
| std::lock_guard<std::mutex> lock(capture_mutex_); | ||
| if (is_capturing_) { | ||
| return; | ||
| } | ||
| if (!StartDevice()) return; | ||
| // Get first frame to initialize frame size | ||
| std::lock_guard<std::mutex> frame_lock(frame_mutex_); | ||
| capture_ >> frame_; | ||
| is_capturing_ = true; | ||
| } | ||
| capture_thread_ = std::thread(&VideoCapture::Capture, this); | ||
| } | ||
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| /// @brief Stop capturing frames | ||
| void Stop() { | ||
| std::lock_guard<std::mutex> lock(capture_mutex_); | ||
| if (!is_capturing_) { | ||
| return; | ||
| } | ||
| StopDevice(); | ||
| } | ||
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| /// @brief Get frame from queue | ||
| /// @return cv::Mat. Empty if queue is empty | ||
| cv::Mat GetFrame() { | ||
| cv::Mat frame; | ||
| std::lock_guard<std::mutex> lock(frame_mutex_); | ||
| frame = frame_.clone(); | ||
| return frame; | ||
| } | ||
| }; | ||
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| } // namespace vision | ||
| } // namespace CC | ||
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| #endif // CUSTOMCHAR_SESSION_CHAT_HISTORY_H_ |
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