Question

我正在将Camera2 API集成到我的Android应用中，并在Samsung Galaxy Tab S2上对其进行测试。我需要使用实时预览框架。这是我的代码：

private val onPreviewAvailableListener = ImageReader.OnImageAvailableListener { reader ->
    if (reader != null) {
        val image = reader.acquireNextImage()
        if (image != null) {
            // do something with image
            image.close()
        }
    }
}

private var mPreviewRequestBuilder: CaptureRequest.Builder? = null
private lateinit var mPreviewSize: Size

private fun configurePreview() {
    // some code here 
    // ... 

    previewImageReader = ImageReader.newInstance(
            mPreviewSize.width,
            mPreviewSize.height,
            ImageFormat.YUV_420_888,
            2
    )
    previewImageReader?.setOnImageAvailableListener(onPreviewAvailableListener, backgroundHandler)

    // some code here 
    // ... 
}

// other code

private fun createCameraPreviewSession() {
    mPreviewRequestBuilder = mCameraDevice?.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW)
    mPreviewRequestBuilder?.addTarget(previewImageReader?.surface)
    mPreviewRequestBuilder?.addTarget(surface) // surfaceView

    mCameraDevice?.createCaptureSession(
                    Arrays.asList(previewImageReader?.surface, surface),
                    object : CameraCaptureSession.StateCallback() { },
                    null /* null handler */
}

我需要onPreviewAvailableListener中的图像具有高分辨率。他们是。分辨率不太高。约1280 * 720。问题是我的预览TextureView滞后了，好像设置了15 FPS。

也许我可以减少进入onPreviewAvailableListener的图像的频率。我尝试设置一个标志以仅处理onPreviewAvailableListener的{{1}}中每10到20幅图像，但没有任何变化：

onImageAvailable

我还尝试专门为private val onPreviewAvailableListener = object: ImageReader.OnImageAvailableListener { private var counter = 10 fun onImageAvailable(reader : ImageReader) { if (counter % 10 == 0) { if (reader != null) { val image = reader.acquireNextImage() if (image != null) { // do something with image image.close() } } } if (counter == Int.MAX_VALUE) { counter = 0 } else { counter++ } } }创建一个新的后台线程，以便在该线程上调用其回调方法。均未更改：

onPreviewAvailableListener

到达ImageReader.OnImageAvailableListener的帧的频率

0 个答案: