From 5a6248518654ec97d95d2c463e3ffb4be7bbf456 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Thu, 13 May 2021 17:20:26 -0400
Subject: Initial commit

---
 src/playback.cc | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 src/playback.cc

(limited to 'src/playback.cc')

diff --git a/src/playback.cc b/src/playback.cc
new file mode 100644
index 0000000..045abb6
--- /dev/null
+++ b/src/playback.cc
@@ -0,0 +1,69 @@
+#include "playback.h"
+#include <opencv2/opencv.hpp>
+#include <vector>
+#include <stdexcept>
+#include <iostream>
+#include <thread>
+
+namespace frontend {
+    struct playback_impl {
+        std::vector<cv::Mat> images;
+        int fps;
+        double reportedDuration;
+        std::size_t frameNum = 0;
+    };
+
+    playback::playback(const std::filesystem::path& video) {
+        data = std::shared_ptr<playback_impl>(new playback_impl);
+        cv::VideoCapture cap(video);
+        if(!cap.isOpened()) {
+            throw std::runtime_error("Error loading video " + video.string());
+        }
+        data->fps = cap.get(cv::CAP_PROP_FPS);
+        while(true) {
+            cv::Mat frame;
+            cap >> frame;
+            if(frame.empty()) break;
+            data->images.push_back(frame);
+        }
+        data->reportedDuration = cap.get(cv::CAP_PROP_POS_MSEC) / 1000.0;
+        std::cout << "Reported duration: " << data->reportedDuration << " seconds" << std::endl;
+        cap.release();
+    }
+
+    void playback::display(const std::string& windowName) const {
+        cv::imshow(windowName, data->images[data->frameNum]);
+    }
+
+    bool playback::seekFrame(std::size_t frameNum) {
+        if(frameNum >= data->images.size()) {
+            return false;
+        }
+        data->frameNum = frameNum;
+        return true;
+    }
+
+    std::size_t playback::getFrame() const {
+        return data->frameNum;
+    }
+
+    bool playback::seekTime(double time) {
+        return seekFrame(std::size_t(time * data->fps));
+    }
+
+    double playback::getTime() const {
+        return getFrame() / (double) data->fps;
+    }
+    
+    void playback::interFrameSleep() const {
+        std::this_thread::sleep_for(std::chrono::milliseconds(1000/data->fps));
+    }
+
+    std::size_t playback::getMaxFrame() const {
+        return data->images.size() - 1;
+    }
+
+    double playback::getMaxTime() const {
+        return getMaxFrame() / (double) data->fps;
+    }
+}
-- 
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