Camera2 API中等效的Camera.PreviewCallback [英] Camera.PreviewCallback equivalent in Camera2 API

问题描述

从API 21开始，Camera2中的Camera.PreviewCallback是否等效，比映射到SurfaceTexture和提取位图更好？我需要能够以YUV的形式从摄像机中提取预览数据吗？

Is there any equivalent for Camera.PreviewCallback in Camera2 from API 21,better than mapping to a SurfaceTexture and pulling a Bitmap ? I need to be able to pull preview data off of the camera as YUV?

推荐答案

您可以从以下的Camera2Basic示例代码开始Google。

You can start from the Camera2Basic sample code from Google.

您需要将 ImageReader 的表面添加为预览捕获请求的目标：

You need to add the surface of the ImageReader as a target to the preview capture request:

//set up a CaptureRequest.Builder with the output Surface
mPreviewRequestBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
mPreviewRequestBuilder.addTarget(surface);
mPreviewRequestBuilder.addTarget(mImageReader.getSurface());

之后，您可以在 ImageReader.OnImageAvailableListener 中检索图像code>：

After that, you can retrieve the image in the ImageReader.OnImageAvailableListener:

private final ImageReader.OnImageAvailableListener mOnImageAvailableListener = new ImageReader.OnImageAvailableListener() {
    @Override
    public void onImageAvailable(ImageReader reader) {
        Image image = null;
        try {
            image = reader.acquireLatestImage();
            if (image != null) {
                ByteBuffer buffer = image.getPlanes()[0].getBuffer();
                Bitmap bitmap = fromByteBuffer(buffer);
                image.close();
            }
        } catch (Exception e) {
            Log.w(LOG_TAG, e.getMessage());
        }
    }
};

要从<$获取位图 c $ c> ByteBuffer ：

To get a Bitmap from the ByteBuffer:

Bitmap fromByteBuffer(ByteBuffer buffer) {
    byte[] bytes = new byte[buffer.capacity()];
    buffer.get(bytes, 0, bytes.length);
    return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
}

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