[英]How to get each frame data using camera2 API in Android5.0 in realtime
[英]How to get single preview frame in Camera2 API Android 5.0?
我正在嘗試使用Camera2 API獲取QR碼掃描功能的預覽框架 。 在舊的Camera API中,它很簡單:
android.hardware.Camera mCamera;
...
mCamera.setPreviewCallback(new Camera.PreviewCallback() {
@Override
public void onPreviewFrame(byte[] data, Camera camera) {
// will be invoked for every preview frame in addition to displaying them on the screen
}
});
不過,我不能找到一種方法來實現,使用新的 API Camera2。 我想收到多個我可以處理的幀 - 最好的是接收舊API中的字節數組。 任何想法如何做到這一點?
有點遲,但總比沒有好:
通常, TextureView
用於顯示攝像機的預覽。 每次曲面更改時,您都可以使用TextureView.SurfaceTextureListener
來獲取回調。 TextureView
確實提供了一個方法getBitmap(Bitmap)
,您可以使用它來獲取與TextureView
相同大小的預覽框架。
您可以使用此Google示例作為起點。 只需更新surfaceTextureListener,如下所示:
private val surfaceTextureListener = object : TextureView.SurfaceTextureListener {
override fun onSurfaceTextureAvailable(texture: SurfaceTexture, width: Int, height: Int) {
openCamera(width, height)
}
override fun onSurfaceTextureSizeChanged(texture: SurfaceTexture, width: Int, height: Int) {
configureTransform(width, height)
}
override fun onSurfaceTextureDestroyed(texture: SurfaceTexture) = true
override fun onSurfaceTextureUpdated(texture: SurfaceTexture) {
// Start changes
// Get the bitmap
val frame = Bitmap.createBitmap(textureView.width, textureView.height, Bitmap.Config.ARGB_8888)
textureView.getBitmap(frame)
// Do whatever you like with the frame
frameProcessor?.processFrame(frame)
// End changes
}
}
使用下面的代碼來執行此操作。
CameraManager manager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
try {
CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraDevice.getId());
Size[] jpegSizes = null;
if (characteristics != null) {
jpegSizes = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP).getOutputSizes(ImageFormat.JPEG);
}
int width = 480;//480x320
int height = 320;
if (jpegSizes != null && 0 < jpegSizes.length) {
width = jpegSizes[0].getWidth();
height = jpegSizes[0].getHeight();
}
ImageReader reader = ImageReader.newInstance(width, height, ImageFormat.JPEG, 1);
List<Surface> outputSurfaces = new ArrayList<Surface>(2);
outputSurfaces.add(reader.getSurface());
outputSurfaces.add(new Surface(textureView.getSurfaceTexture()));
final CaptureRequest.Builder captureBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
captureBuilder.addTarget(reader.getSurface());
captureBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
// Orientation
int rotation = ((Activity) context).getWindowManager().getDefaultDisplay().getRotation();
captureBuilder.set(CaptureRequest.JPEG_ORIENTATION, ORIENTATIONS.get(rotation));
final File file = getFileDir();
ImageReader.OnImageAvailableListener readerListener = new ImageReader.OnImageAvailableListener() {
@Override
public void onImageAvailable(ImageReader reader) {
Image image = null;
try {
image = reader.acquireLatestImage();
ByteBuffer buffer = image.getPlanes()[0].getBuffer();
byte[] bytes = new byte[buffer.capacity()];
buffer.get(bytes);
save(bytes);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (image != null) {
image.close();
}
}
}
private void save(byte[] bytes) throws IOException {
OutputStream output = null;
try {
output = new FileOutputStream(file);
output.write(bytes);
} finally {
if (null != output) {
output.close();
}
}
}
};
reader.setOnImageAvailableListener(readerListener, mBackgroundHandler);
} catch (CameraAccessException e) {
e.printStackTrace();
}
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