frame_capture.cpp

//
// Created by pengx on 2026/1/9.
//

#include "frame_capture.hpp"
#include "base_config.hpp"

#include <QDebug>

FrameCapture::FrameCapture(const int index) {
    _index = index;
    // 注册用于跨线程 queued signal 的类型
    qRegisterMetaType<cv::Mat>("cv::Mat");
}

void FrameCapture::start() {
    if (!_cap.open(0, cv::CAP_V4L2)) {
        emit errorOccurred("Cannot open camera");
        return;
    }
    // 设置参数
    _cap.set(cv::CAP_PROP_FRAME_WIDTH, VIDEO_WIDTH);
    _cap.set(cv::CAP_PROP_FRAME_HEIGHT, VIDEO_HEIGHT);
    _cap.set(cv::CAP_PROP_FPS, VIDEO_FPS);

    _isRunning = true;
    _timerPtr = std::make_unique<QTimer>(this);
    connect(_timerPtr.get(), &QTimer::timeout, this, &FrameCapture::captureOnce);
    _timerPtr->start(40);
}

void FrameCapture::captureOnce() {
    if (!_isRunning.load()) {
        qWarning() << "FrameCapture::captureOnce() called when not running";
        return;
    }
    cv::Mat frame;
    _cap >> frame;
    if (!frame.empty()) {
        emit frameCaptured(frame);
    }
}

void FrameCapture::stop() {
    _isRunning = false;
    if (_timerPtr) {
        _timerPtr->stop();
        _timerPtr.reset();
    }

    if (_cap.isOpened()) {
        _cap.release();
    }
}

FrameCapture::~FrameCapture() {
    stop();
}