{"id":788,"date":"2023-08-18T10:15:15","date_gmt":"2023-08-18T02:15:15","guid":{"rendered":"https:\/\/zhaocunwei.co.uk\/?p=788"},"modified":"2023-08-18T10:21:27","modified_gmt":"2023-08-18T02:21:27","slug":"qt5","status":"publish","type":"post","link":"https:\/\/zhaocunwei.co.uk\/index.php\/2023\/08\/18\/qt5\/","title":{"rendered":"QT5\u5b9e\u73b0\u89c6\u9891\u64ad\u653e\u5668"},"content":{"rendered":"

\u524d\u8a00<\/h1>\n

\u6db5\u76d6\u4e86\u89c6\u9891\u64ad\u653e\u5668\u7684\u521b\u5efa\u548c\u57fa\u672c\u529f\u80fd<\/p>\n

\u89c6\u9891\u64ad\u653e\u5668\u5b9e\u73b0\u793a\u4f8b<\/h1>\n
#include <QtWidgets>\n#include <QtMultimediaWidgets>\nclass VideoPlayer : public QWidget {\n    Q_OBJECT\npublic:\n    VideoPlayer(QWidget *parent = nullptr)\n        : QWidget(parent)\n    {\n        QVBoxLayout *layout = new QVBoxLayout(this);\n        videoWidget = new QVideoWidget(this);\n        layout->addWidget(videoWidget);\n        mediaPlayer = new QMediaPlayer(this);\n        mediaPlayer->setVideoOutput(videoWidget);\n        controlLayout = new QHBoxLayout;\n        playButton = new QPushButton("Play");\n        pauseButton = new QPushButton("Pause");\n        controlLayout->addWidget(playButton);\n        controlLayout->addWidget(pauseButton);\n        layout->addLayout(controlLayout);\n        connect(playButton, &QPushButton::clicked, this, &VideoPlayer::play);\n        connect(pauseButton, &QPushButton::clicked, this, &VideoPlayer::pause);\n        \/\/ Replace with your video file path\n        videoFilePath = "\/path\/to\/your\/video\/file.mp4";\n        mediaPlayer->setMedia(QUrl::fromLocalFile(videoFilePath));\n    }\n\nprivate slots:\n    void play() {\n        mediaPlayer->play();\n    }\n\n    void pause() {\n        mediaPlayer->pause();\n    }\n\nprivate:\n    QVideoWidget *videoWidget;\n    QMediaPlayer *mediaPlayer;\n    QPushButton *playButton;\n    QPushButton *pauseButton;\n    QHBoxLayout *controlLayout;\n    QString videoFilePath;\n};\n\nint main(int argc, char *argv[]) {\n    QApplication app(argc, argv);\n\n    VideoPlayer player;\n    player.show();\n\n    return app.exec();\n}\n#include "main.moc"<\/code><\/pre>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u521b\u5efa\u4e00\u4e2a\u540d\u4e3aVideoPlayer\u7684\u81ea\u5b9a\u4e49QWidget\u7c7b\uff0c\u5176\u4e2d\u5305\u542b\u4e86\u4e00\u4e2a\u89c6\u9891\u64ad\u653e\u533a\u57df\uff08QVideoWidget\uff09\u548c\u63a7\u5236\u6309\u94ae\uff08Play\u548cPause\uff09\u3002\u64ad\u653e\u5668\u4f7f\u7528QMediaPlayer\u6765\u7ba1\u7406\u89c6\u9891\u64ad\u653e\uff0c\u5e76\u5c06\u89c6\u9891\u8f93\u51fa\u5230QVideoWidget\u3002<\/p>\n
\u8981\u6d4b\u8bd5\u6b64\u793a\u4f8b\uff0c\u60a8\u9700\u8981\u66ff\u6362videoFilePath\u53d8\u91cf\u4e2d\u7684\u8def\u5f84\u4e3a\u60a8\u81ea\u5df1\u7684\u89c6\u9891\u6587\u4ef6\u8def\u5f84\u3002\u7136\u540e\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528Qt Creator\u6216\u547d\u4ee4\u884c\u7f16\u8bd1\u5668\u6765\u6784\u5efa\u548c\u8fd0\u884c\u8be5\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n
\u5b9e\u73b0\u5feb\u8fdb\u548c\u5386\u53f2\u64ad\u653e\u8bb0\u5f55\u529f\u80fd<\/h1>\n
#include <QtWidgets>\n#include <QtMultimediaWidgets>\n\nclass VideoPlayer : public QWidget {\n    Q_OBJECT\n\npublic:\n    VideoPlayer(QWidget *parent = nullptr)\n        : QWidget(parent)\n    {\n        QVBoxLayout *layout = new QVBoxLayout(this);\n        videoWidget = new QVideoWidget(this);\n        layout->addWidget(videoWidget);\n        mediaPlayer = new QMediaPlayer(this);\n        mediaPlayer->setVideoOutput(videoWidget);\n        controlLayout = new QHBoxLayout;\n        playButton = new QPushButton("Play");\n        pauseButton = new QPushButton("Pause");\n        forwardButton = new QPushButton("Forward");\n        historyButton = new QPushButton("History");\n        controlLayout->addWidget(playButton);\n        controlLayout->addWidget(pauseButton);\n        controlLayout->addWidget(forwardButton);\n        controlLayout->addWidget(historyButton);\n        layout->addLayout(controlLayout);\n        connect(playButton, &QPushButton::clicked, this, &VideoPlayer::play);\n        connect(pauseButton, &QPushButton::clicked, this, &VideoPlayer::pause);\n        connect(forwardButton, &QPushButton::clicked, this, &VideoPlayer::forward);\n        connect(historyButton, &QPushButton::clicked, this, &VideoPlayer::showHistory);\n        \/\/ Replace with your video file path\n        videoFilePath = "\/path\/to\/your\/video\/file.mp4";\n        mediaPlayer->setMedia(QUrl::fromLocalFile(videoFilePath));\n    }\n\nprivate slots:\n    void play() {\n        mediaPlayer->play();\n    }\n\n    void pause() {\n        mediaPlayer->pause();\n    }\n\n    void forward() {\n        qint64 currentPosition = mediaPlayer->position();\n        qint64 newPosition = currentPosition + 10000; \/\/ Forward by 10 seconds\n        mediaPlayer->setPosition(newPosition);\n    }\n\n    void showHistory() {\n        QMediaPlaylist *playlist = mediaPlayer->playlist();\n        if (!playlist) {\n            playlist = new QMediaPlaylist(mediaPlayer);\n            mediaPlayer->setPlaylist(playlist);\n        }\n        \/\/ Save the current position to the history\n        playlist->addMedia(QUrl::fromLocalFile(videoFilePath));\n        \/\/ Play the last item in the playlist (latest history entry)\n        mediaPlayer->setPlaylist(playlist);\n        mediaPlayer->play();\n    }\n\nprivate:\n    QVideoWidget *videoWidget;\n    QMediaPlayer *mediaPlayer;\n    QPushButton *playButton;\n    QPushButton *pauseButton;\n    QPushButton *forwardButton;\n    QPushButton *historyButton;\n    QHBoxLayout *controlLayout;\n    QString videoFilePath;\n};\n\nint main(int argc, char *argv[]) {\n    QApplication app(argc, argv);\n\n    VideoPlayer player;\n    player.show();\n\n    return app.exec();\n}\n#include "main.moc"<\/code><\/pre>\n
\u5386\u53f2\u64ad\u653e\u8bb0\u5f55<\/h1>\n
#include <QtWidgets>\n#include <QtMultimediaWidgets>\n\nclass VideoPlayer : public QWidget {\n    Q_OBJECT\n\npublic:\n    VideoPlayer(QWidget *parent = nullptr)\n        : QWidget(parent)\n    {\n        QVBoxLayout *layout = new QVBoxLayout(this);\n        videoWidget = new QVideoWidget(this);\n        layout->addWidget(videoWidget);\n        mediaPlayer = new QMediaPlayer(this);\n        mediaPlayer->setVideoOutput(videoWidget);\n        controlLayout = new QHBoxLayout;\n        playButton = new QPushButton("Play");\n        pauseButton = new QPushButton("Pause");\n        forwardButton = new QPushButton("Forward");\n        historyButton = new QPushButton("History");\n        controlLayout->addWidget(playButton);\n        controlLayout->addWidget(pauseButton);\n        controlLayout->addWidget(forwardButton);\n        controlLayout->addWidget(historyButton);\n        layout->addLayout(controlLayout);\n        connect(playButton, &QPushButton::clicked, this, &VideoPlayer::play);\n        connect(pauseButton, &QPushButton::clicked, this, &VideoPlayer::pause);\n        connect(forwardButton, &QPushButton::clicked, this, &VideoPlayer::forward);\n        connect(historyButton, &QPushButton::clicked, this, &VideoPlayer::showHistory);\n        \/\/ Create a media playlist for history\n        historyPlaylist = new QMediaPlaylist(mediaPlayer);\n        mediaPlayer->setPlaylist(historyPlaylist);\n        \/\/ Replace with your video file path\n        videoFilePath = "\/path\/to\/your\/video\/file.mp4";\n        mediaPlayer->setMedia(QUrl::fromLocalFile(videoFilePath));\n    }\n\nprivate slots:\n    void play() {\n        mediaPlayer->play();\n    }\n\n    void pause() {\n        mediaPlayer->pause();\n    }\n\n    void forward() {\n        qint64 currentPosition = mediaPlayer->position();\n        qint64 newPosition = currentPosition + 10000; \/\/ Forward by 10 seconds\n        mediaPlayer->setPosition(newPosition);\n    }\n\n    void showHistory() {\n        \/\/ Play the last item in the history playlist\n        if (historyPlaylist->mediaCount() > 0) {\n            historyPlaylist->setCurrentIndex(historyPlaylist->mediaCount() - 1);\n            mediaPlayer->play();\n        }\n    }\n\nprivate:\n    QVideoWidget *videoWidget;\n    QMediaPlayer *mediaPlayer;\n    QMediaPlaylist *historyPlaylist;\n    QPushButton *playButton;\n    QPushButton *pauseButton;\n    QPushButton *forwardButton;\n    QPushButton *historyButton;\n    QHBoxLayout *controlLayout;\n    QString videoFilePath;\n};\n\nint main(int argc, char *argv[]) {\n    QApplication app(argc, argv);\n\n    VideoPlayer player;\n    player.show();\n\n    return app.exec();\n}\n\n#include "main.moc"<\/code><\/pre>\n
\u5b9e\u73b0\u964d\u566a\u5904\u7406<\/h1>\n
#include <QtWidgets>\n#include <QtMultimedia>\n\nclass NoiseReducer : public QWidget {\n    Q_OBJECT\n\npublic:\n    NoiseReducer(QWidget *parent = nullptr)\n        : QWidget(parent)\n    {\n        QVBoxLayout *layout = new QVBoxLayout(this);\n\n        startButton = new QPushButton("Start Recording");\n        stopButton = new QPushButton("Stop Recording");\n        toggleNoiseReductionButton = new QPushButton("Toggle Noise Reduction");\n\n        layout->addWidget(startButton);\n        layout->addWidget(stopButton);\n        layout->addWidget(toggleNoiseReductionButton);\n\n        connect(startButton, &QPushButton::clicked, this, &NoiseReducer::startRecording);\n        connect(stopButton, &QPushButton::clicked, this, &NoiseReducer::stopRecording);\n        connect(toggleNoiseReductionButton, &QPushButton::clicked, this, &NoiseReducer::toggleNoiseReduction);\n\n        audioInput = nullptr;\n        audioOutput = nullptr;\n        noiseReductionEnabled = false;\n    }\n\nprivate slots:\n    void startRecording() {\n        QAudioFormat format;\n        format.setSampleRate(44100);\n        format.setChannelCount(1);\n        format.setSampleSize(16);\n        format.setCodec("audio\/pcm");\n        format.setByteOrder(QAudioFormat::LittleEndian);\n        format.setSampleType(QAudioFormat::SignedInt);\n\n        QAudioDeviceInfo inputDeviceInfo = QAudioDeviceInfo::defaultInputDevice();\n        if (!inputDeviceInfo.isFormatSupported(format)) {\n            qWarning() << "Default format not supported, trying to use nearest";\n            format = inputDeviceInfo.nearestFormat(format);\n        }\n\n        audioInput = new QAudioInput(inputDeviceInfo, format, this);\n\n        noiseReductionBuffer.clear();\n        audioInputIODevice = audioInput->start();\n        connect(audioInputIODevice, &QIODevice::readyRead, this, &NoiseReducer::processAudioData);\n    }\n\n    void stopRecording() {\n        if (audioInput) {\n            audioInput->stop();\n            delete audioInput;\n            audioInput = nullptr;\n        }\n    }\n\n    void toggleNoiseReduction() {\n        noiseReductionEnabled = !noiseReductionEnabled;\n    }\n\n    void processAudioData() {\n        QByteArray audioData = audioInputIODevice->readAll();\n\n        if (noiseReductionEnabled) {\n            \/\/ Apply a simple moving average filter to simulate noise reduction\n            noiseReductionBuffer.append(audioData);\n            if (noiseReductionBuffer.size() > 44100) {  \/\/ Adjust buffer size based on your needs\n                noiseReductionBuffer.remove(0, noiseReductionBuffer.size() - 44100);\n            }\n\n            \/\/ Calculate the average value and replace the audio data with the average\n            qint16 average = 0;\n            for (char value : noiseReductionBuffer) {\n                average += static_cast<qint8>(value);\n            }\n            average \/= noiseReductionBuffer.size();\n\n            audioData.fill(static_cast<char>(average), audioData.size());\n        }\n\n        \/\/ Play the processed audio\n        if (!audioOutput) {\n            audioOutput = new QAudioOutput(QAudioDeviceInfo::defaultOutputDevice(), audioInput->format(), this);\n            audioOutputIODevice = audioOutput->start();\n        }\n        audioOutputIODevice->write(audioData);\n    }\n\nprivate:\n    QPushButton *startButton;\n    QPushButton *stopButton;\n    QPushButton *toggleNoiseReductionButton;\n    QAudioInput *audioInput;\n    QIODevice *audioInputIODevice;\n    QAudioOutput *audioOutput;\n    QIODevice *audioOutputIODevice;\n    QByteArray noiseReductionBuffer;\n    bool noiseReductionEnabled;\n};\n\nint main(int argc, char *argv[]) {\n    QApplication app(argc, argv);\n\n    NoiseReducer noiseReducer;\n    noiseReducer.show();\n\n    return app.exec();\n}\n\n#include "main.moc"\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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