使用Camera2录制60fps视频(安卓21版)接口

Question

我正在尝试在Camera2(android.hardware.camera2) API上以60(或更高)fps的速率录制视频。

最后，我使用CameraConstrainedHighSpeedCaptureSession以120fps的速度成功录制。但它只针对>=120fps用例，而不是60fps。

即使我尝试使用普通捕获会话(CameraCaptureSession)以60fps的速度录制，它也只支持<=30fps。我可以通过下面的代码来解决这个问题。

Range<Integer>[] fpsRanges = characteristics.get(CameraCharacteristics.CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES);

我不知道如何用Camera2 API录制60fps的视频。

任何想法都是最受欢迎的。

谢谢。

Answer 1

您必须从CameraDevice创建一个ConstrainedHighSpeedCaptureSession并实例化一个新会话，就像您对普通捕获会话所做的那样。

此外，您还需要将下一个值设置为您的Builder：

myPreviewRequestBuilder.set(CaptureRequest.CONTROL_MODE, CaptureRequest.CONTROL_MODE_USE_SCENE_MODE);
myPreviewRequestBuilder.set(CaptureRequest.CONTROL_SCENE_MODE, CaptureRequest.CONTROL_SCENE_MODE_HIGH_SPEED_VIDEO);
myPreviewRequestBuilder.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, new Range<Integer>(frameRate, frameRate));

之后，使用构建器生成一个CaptureRequestList：

 myHighSpeedRequestList = ((CameraConstrainedHighSpeedCaptureSession) cameraCaptureSession).createHighSpeedRequestList(myPreviewRequestBuilder.build());

并在捕获会话中使用它来生成CaptureSession：

mCaptureSession.setRepeatingBurst(myHighSpeedRequestList,
                                  YourHighSpeedVideoCaptureCallback,
                                  YourBackgroundHandler);

Answer 2

使用以下代码：

private fun recordSession() {
    setUpMediaRecorder()

    val surfaceTexture = textureView.surfaceTexture

    surfaceTexture?.setDefaultBufferSize(mPreviewSize!!.width, mPreviewSize!!.height)
    captureRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_RECORD)
    val surfaces = ArrayList<Surface>()

    val textureSurface = Surface(surfaceTexture)
    surfaces.add(textureSurface)
    captureRequestBuilder.addTarget(textureSurface)


    val recordSurface = mediaRecorder.surface
    surfaces.add(recordSurface)
    captureRequestBuilder.addTarget(recordSurface)


    mCameraDevice.createCaptureSession(
        surfaces,
        object : CameraCaptureSession.StateCallback() {

            override fun onConfigured(session: CameraCaptureSession) {
                captureSession = session
                val fps: Int = if (PreferenceProvider.getIsFrontCameraOpened()) {
                    PreferenceProvider.getFrontCameraVideoFrameRate()
                } else {
                    PreferenceProvider.getBackCameraVideoFrameRate()
                }
                captureRequestBuilder.set(
                    CaptureRequest.CONTROL_MODE,
                    CaptureRequest.CONTROL_MODE_USE_SCENE_MODE
                )
                captureRequestBuilder.set(
                    CaptureRequest.CONTROL_SCENE_MODE,
                    CaptureRequest.CONTROL_SCENE_MODE_HIGH_SPEED_VIDEO
                )
                captureRequestBuilder.set(
                    CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE,
                    Range(fps, fps)
                )
                captureRequestBuilder.set(CaptureRequest.CONTROL_AE_EXPOSURE_COMPENSATION, currentExposureLevel)
                updatePreview()
                isRecording = true
                mediaRecorder.start()
            }

            override fun onConfigureFailed(session: CameraCaptureSession) {
                showLog(TAG, "Failed to create CameraRecordSession!")
            }

        },
        mBackgroundHandler
    )
}

注意:确保在MediaRecorder配置中设置相同的帧率(即60)，才能在视频中获得60fps的效果。