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#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, std::size_t frameCap) {
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(frameCap == 0 or data->images.size() < frameCap) {
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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