Qt音视频开发39-人脸识别在线版

void FaceWebBaiDu::finished(QNetworkReply *reply)
{
    QString error = reply->errorString();
    if (!error.isEmpty() && error != "Unknown error") {
        emit receiveError(error);
    }

    if (reply->bytesAvailable() > 0 && reply->error() == QNetworkReply::NoError) {
        QString data = reply->readAll();
        reply->deleteLater();

        //发送接收数据信号
        emit receiveData(data);

        //初始化脚本引擎
        QScriptEngine engine;
        //构建解析对象
        QScriptValue script = engine.evaluate("value=" + data);

        //获取鉴权标识符
        QString token = script.property("access_token").toString();
        if (!token.isEmpty()) {
            this->token = token;
            emit receiveResult(0, "鉴权标识返回成功");
            return;
        }

        //通用返回结果字段
        int code = script.property("error_code").toInt32();
        QString msg = script.property("error_msg").toString();
        emit receiveResult(code, msg);

        //图片识别部分
        QScriptValue result = script.property("result");
        if (!result.isNull()) {
            //人脸识别
            if (data.contains("location")) {
                QScriptValue face_list = result.property("face_list");
                checkFaceList(face_list);
            }

            //人脸比对
            if (data.contains("score") && !data.contains("location")) {
                QScriptValue score = result.property("score");
                float result = score.toString().toFloat();
                if (result > 0) {
                    emit receiveFaceCompare(QRect(), QRect(), result);
                } else {
                    emit receiveFaceCompareFail();
                }
            }

            //活体检测
            if (data.contains("face_liveness")) {
                QScriptValue face_liveness = result.property("face_liveness");
                float result = face_liveness.toString().toFloat();
                if (result >= 0) {
                    emit receiveLive(result);
                }
            }           
        }        
    }
}

void FaceWebBaiDu::checkFaceList(const QScriptValue &scriptValue)
{
    //创建迭代器逐个解析具体值
    QScriptValueIterator it(scriptValue);
    while (it.hasNext()) {
        it.next();
        if (it.flags() & QScriptValue::SkipInEnumeration) {
            continue;
        }

        QRect rect;
        QString face_token = it.value().property("face_token").toString();
        if (!face_token.isEmpty()) {
            QScriptValue value = it.value().property("location");
            rect = FaceHelper::getRect(value);
        }

        if (rect.width() > 0) {
            emit receiveFaceRect(rect);
            break;
        }
    }
}

void FaceWebBaiDu::getToken()
{
    //具体参见 http://ai.baidu.com/ai-doc/REFERENCE/Ck3dwjhhu
    QStringList list;
    list.append(QString("grant_type=%1").arg("client_credentials"));
    list.append(QString("client_id=%1").arg(key));
    list.append(QString("client_secret=%1").arg(secret));
    QString data = list.join("&");

    QString url = "https://aip.baidubce.com/oauth/2.0/token";
    FaceHelper::sendData(manager, url, data);
}

void FaceWebBaiDu::detect(const QImage &img)
{
    QString imgData = FaceHelper::getImageData2(img);

    QStringList list;
    list.append(QString("{\"image\":\"%1\",\"image_type\":\"BASE64\"}").arg(imgData));
    QString data = list.join("");

    QString url = QString("https://aip.baidubce.com/rest/2.0/face/v3/detect?access_token=%1").arg(token);
    FaceHelper::sendData(manager, url, data);
}

void FaceWebBaiDu::compare(const QImage &img1, const QImage &img2)
{
    QString imgData1 = FaceHelper::getImageData2(img1);
    QString imgData2 = FaceHelper::getImageData2(img2);

    //如果需要活体检测则NONE改为LOW NORMAL HIGH
    QStringList list;
    list.append("[");
    list.append(QString("{\"image\":\"%1\",\"image_type\":\"BASE64\",\"liveness_control\":\"NONE\"}").arg(imgData1));
    list.append(",");
    list.append(QString("{\"image\":\"%1\",\"image_type\":\"BASE64\",\"liveness_control\":\"NONE\"}").arg(imgData2));
    list.append("]");
    QString data = list.join("");

    QString url = QString("https://aip.baidubce.com/rest/2.0/face/v3/match?access_token=%1").arg(token);
    FaceHelper::sendData(manager, url, data);
}

void FaceWebBaiDu::live(const QImage &img)
{
    QList<QImage> imgs;
    if (!img.isNull()) {
        imgs << img;
    }

    live(imgs);
}

void FaceWebBaiDu::live(const QList<QImage> &imgs)
{
    //记住最后一次处理的时间,限制频繁的调用
    QDateTime now = QDateTime::currentDateTime();
    if (lastTime.msecsTo(now) < 500) {
        return;
    }

    lastTime = now;
    QStringList list;
    list.append("[");

    int count = imgs.count();
    for (int i = 0; i < count; i++) {
        QString imgData = FaceHelper::getImageData2(imgs.at(i));
        list.append(QString("{\"image\":\"%1\",\"image_type\":\"BASE64\"}").arg(imgData));
        if (i < count - 1) {
            list.append(",");
        }
    }

    list.append("]");
    QString data = list.join("");

    QString url = QString("https://aip.baidubce.com/rest/2.0/face/v3/faceverify?access_token=%1").arg(token);
    FaceHelper::sendData(manager, url, data);
}