QT6如何录制QCamera的音频

在Qt 6中，如果你想录制QCamera设备的音频，你可以使用QCameraVideoRecorder组件。首先，你需要设置好QCamera对象，并连接到合适的视频源，然后创建一个QCameraVideoRecorder实例并配置它来记录音频。以下是一个简单的步骤概述：

1. **设置QCamera**:

   QCamera *camera = new QCamera(deviceName); // deviceName是你摄像头的名称
   connect(camera, &QCamera::stateChanged, this, &YourClass::onStateChange);
   camera->start();

2. **创建QCameraVideoRecorder**:

   QCameraVideoFormat videoFormat;
   videoFormat.setFrameRate(30); // 设置帧率
   videoFormat.setCodec("audio/pcm"); // 使用无损的PCM编码

   QCameraVideoRecorder *recorder = new QCameraVideoRecorder(camera);
   recorder->setDesiredCaptureFormat(videoFormat);

3. **开始录音**:

   if (recorder->isRecordingSupported()) {
       recorder->startRecording(fileUrl); // fileUrl是你想要保存音频的文件路径
   } else {
       qDebug() << "Audio recording not supported on this device.";
   }

4. **停止录音**:

   void stopRecording() {
       recorder->stopRecording();
       delete recorder;
   }

5. **处理状态变化**:

   void onStateChange(QCamera::State state) {
       if (state == QCamera::RecordingState) {
           qDebug() << "Recording started";
       } else if (state == QCamera::ReadyState) {
           qDebug() << "Recording stopped";
           stopRecording();
       }
   }

记得处理可能出现的错误，如权限问题、设备支持等。