com.yy.mediaframework

Class CameraUtils

java.lang.Object

com.yy.mediaframework.CameraUtils

public class CameraUtils
extends java.lang.Object

Camera-related utility functions.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	CameraUtils.CameraFacing 摄像头方向
static class	CameraUtils.PreviewSize

Constructor Summary

Constructors

Constructor and Description
CameraUtils()

Method Summary

Modifier and Type	Method and Description
static int	chooseFixedPreviewFps(android.hardware.Camera.Parameters parms, int desiredThousandFps) Attempts to find a fixed preview frame rate that matches the desired frame rate.
static void	choosePreviewSize(android.hardware.Camera.Parameters parms, int width, int height) Attempts to find a preview size that matches the provided width and height (which specify the dimensions of the encoded video).
static int	clamp(int x, int min, int max)
static int[]	getMaxFrameRateRange(android.hardware.Camera.Parameters params)
static CameraUtils.PreviewSize	getSpecialCameraPreviewSizeWithModel(java.lang.String model, android.hardware.Camera.Size size, CameraUtils.CameraFacing facing)
static boolean	isCameraAvailable(int facing)
static boolean	isFaceDetectionSupported(android.hardware.Camera.Parameters params)
static boolean	isFocusAreaSupported(android.hardware.Camera.Parameters params)
static boolean	isMeteringAreaSupported(android.hardware.Camera.Parameters params)
static boolean	isSupported(java.lang.String value, java.util.List<java.lang.String> supported)
static android.hardware.Camera	openCamera(CameraUtils.CameraFacing cameraFacing) 打开摄像头
static android.hardware.Camera	openCamera(CameraUtils.CameraFacing cameraFacing, android.hardware.Camera.CameraInfo info)
static void	prepareMatrix(android.graphics.Matrix matrix, boolean mirror, int displayOrientation, int viewWidth, int viewHeight)
static void	rectFToRect(android.graphics.RectF rectF, android.graphics.Rect rect)
static android.hardware.Camera.Size	selectPreferredSize(android.hardware.Camera.Parameters params, int width, int height)
static void	setCameraDisplayOrientation(android.content.Context context, android.hardware.Camera camera, android.hardware.Camera.CameraInfo cameraInfo)
static void	setCameraDisplayOrientation(int displayRotation, android.hardware.Camera camera, android.hardware.Camera.CameraInfo cameraInfo)
static int	toAndroidCameraFacing(CameraUtils.CameraFacing facing)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CameraUtils

public CameraUtils()

Method Detail

setCameraDisplayOrientation

public static void setCameraDisplayOrientation(android.content.Context context,
                                               android.hardware.Camera camera,
                                               android.hardware.Camera.CameraInfo cameraInfo)

setCameraDisplayOrientation

public static void setCameraDisplayOrientation(int displayRotation,
                                               android.hardware.Camera camera,
                                               android.hardware.Camera.CameraInfo cameraInfo)

selectPreferredSize

public static android.hardware.Camera.Size selectPreferredSize(android.hardware.Camera.Parameters params,
                                                               int width,
                                                               int height)

choosePreviewSize

public static void choosePreviewSize(android.hardware.Camera.Parameters parms,
                                     int width,
                                     int height)

Attempts to find a preview size that matches the provided width and height (which specify the dimensions of the encoded video). If it fails to find a match it just uses the default preview size for video.

TODO: should do a best-fit match, e.g. https://github.com/commonsguy/cwac-camera/blob/master/camera/src/com/commonsware/cwac/camera/CameraUtils.java

chooseFixedPreviewFps

public static int chooseFixedPreviewFps(android.hardware.Camera.Parameters parms,
                                        int desiredThousandFps)

Attempts to find a fixed preview frame rate that matches the desired frame rate.

It doesn't seem like there's a great deal of flexibility here.

TODO: follow the recipe from http://stackoverflow.com/questions/22639336/#22645327

Returns:

The expected frame rate, in thousands of frames per second.

openCamera

public static android.hardware.Camera openCamera(CameraUtils.CameraFacing cameraFacing)

打开摄像头

Parameters:

cameraFacing - 正面，还是反面

Returns:

openCamera

public static android.hardware.Camera openCamera(CameraUtils.CameraFacing cameraFacing,
                                                 android.hardware.Camera.CameraInfo info)

getSpecialCameraPreviewSizeWithModel

public static CameraUtils.PreviewSize getSpecialCameraPreviewSizeWithModel(java.lang.String model,
                                                                           android.hardware.Camera.Size size,
                                                                           CameraUtils.CameraFacing facing)

toAndroidCameraFacing

public static int toAndroidCameraFacing(CameraUtils.CameraFacing facing)

isCameraAvailable

public static boolean isCameraAvailable(int facing)

getMaxFrameRateRange

public static int[] getMaxFrameRateRange(android.hardware.Camera.Parameters params)

isMeteringAreaSupported

public static boolean isMeteringAreaSupported(android.hardware.Camera.Parameters params)

isFocusAreaSupported

public static boolean isFocusAreaSupported(android.hardware.Camera.Parameters params)

isFaceDetectionSupported

public static boolean isFaceDetectionSupported(android.hardware.Camera.Parameters params)

isSupported

public static boolean isSupported(java.lang.String value,
                                  java.util.List<java.lang.String> supported)

clamp

public static int clamp(int x,
                        int min,
                        int max)

rectFToRect

public static void rectFToRect(android.graphics.RectF rectF,
                               android.graphics.Rect rect)

prepareMatrix

public static void prepareMatrix(android.graphics.Matrix matrix,
                                 boolean mirror,
                                 int displayOrientation,
                                 int viewWidth,
                                 int viewHeight)