579 lines
20 KiB
Java
579 lines
20 KiB
Java
/*
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* Copyright 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.android.camera2video;
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import android.app.Activity;
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import android.app.AlertDialog;
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import android.app.Dialog;
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import android.app.DialogFragment;
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import android.app.Fragment;
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import android.content.Context;
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import android.content.DialogInterface;
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import android.content.res.Configuration;
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import android.graphics.Matrix;
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import android.graphics.RectF;
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import android.graphics.SurfaceTexture;
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import android.hardware.camera2.CameraAccessException;
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import android.hardware.camera2.CameraCaptureSession;
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import android.hardware.camera2.CameraCharacteristics;
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import android.hardware.camera2.CameraDevice;
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import android.hardware.camera2.CameraManager;
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import android.hardware.camera2.CameraMetadata;
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import android.hardware.camera2.CaptureRequest;
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import android.hardware.camera2.params.StreamConfigurationMap;
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import android.media.MediaRecorder;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.HandlerThread;
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import android.util.Log;
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import android.util.Size;
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import android.util.SparseIntArray;
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import android.view.LayoutInflater;
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import android.view.Surface;
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import android.view.TextureView;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.Button;
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import android.widget.Toast;
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import java.io.File;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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import java.util.List;
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import java.util.concurrent.Semaphore;
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import java.util.concurrent.TimeUnit;
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public class Camera2VideoFragment extends Fragment implements View.OnClickListener {
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private static final SparseIntArray ORIENTATIONS = new SparseIntArray();
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private static final String TAG = "Camera2VideoFragment";
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static {
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ORIENTATIONS.append(Surface.ROTATION_0, 90);
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ORIENTATIONS.append(Surface.ROTATION_90, 0);
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ORIENTATIONS.append(Surface.ROTATION_180, 270);
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ORIENTATIONS.append(Surface.ROTATION_270, 180);
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}
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/**
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* An {@link AutoFitTextureView} for camera preview.
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*/
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private AutoFitTextureView mTextureView;
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/**
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* Button to record video
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*/
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private Button mButtonVideo;
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/**
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* A refernce to the opened {@link android.hardware.camera2.CameraDevice}.
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*/
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private CameraDevice mCameraDevice;
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/**
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* A reference to the current {@link android.hardware.camera2.CameraCaptureSession} for preview.
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*/
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private CameraCaptureSession mPreviewSession;
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/**
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* {@link TextureView.SurfaceTextureListener} handles several lifecycle events on a
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* {@link TextureView}.
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*/
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private TextureView.SurfaceTextureListener mSurfaceTextureListener
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= new TextureView.SurfaceTextureListener() {
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@Override
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public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture,
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int width, int height) {
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openCamera(width, height);
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}
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@Override
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public void onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture,
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int width, int height) {
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configureTransform(width, height);
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}
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@Override
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public boolean onSurfaceTextureDestroyed(SurfaceTexture surfaceTexture) {
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return true;
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}
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@Override
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public void onSurfaceTextureUpdated(SurfaceTexture surfaceTexture) {
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}
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};
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/**
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* The {@link android.util.Size} of camera preview.
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*/
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private Size mPreviewSize;
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/**
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* The {@link android.util.Size} of video recording.
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*/
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private Size mVideoSize;
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/**
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* Camera preview.
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*/
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private CaptureRequest.Builder mPreviewBuilder;
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/**
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* MediaRecorder
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*/
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private MediaRecorder mMediaRecorder;
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/**
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* Whether the app is recording video now
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*/
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private boolean mIsRecordingVideo;
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/**
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* An additional thread for running tasks that shouldn't block the UI.
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*/
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private HandlerThread mBackgroundThread;
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/**
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* A {@link Handler} for running tasks in the background.
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*/
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private Handler mBackgroundHandler;
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/**
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* A {@link Semaphore} to prevent the app from exiting before closing the camera.
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*/
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private Semaphore mCameraOpenCloseLock = new Semaphore(1);
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/**
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* {@link CameraDevice.StateCallback} is called when {@link CameraDevice} changes its status.
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*/
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private CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() {
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@Override
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public void onOpened(CameraDevice cameraDevice) {
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mCameraDevice = cameraDevice;
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startPreview();
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mCameraOpenCloseLock.release();
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if (null != mTextureView) {
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configureTransform(mTextureView.getWidth(), mTextureView.getHeight());
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}
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}
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@Override
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public void onDisconnected(CameraDevice cameraDevice) {
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mCameraOpenCloseLock.release();
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cameraDevice.close();
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mCameraDevice = null;
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}
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@Override
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public void onError(CameraDevice cameraDevice, int error) {
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mCameraOpenCloseLock.release();
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cameraDevice.close();
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mCameraDevice = null;
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Activity activity = getActivity();
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if (null != activity) {
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activity.finish();
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}
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}
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};
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public static Camera2VideoFragment newInstance() {
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Camera2VideoFragment fragment = new Camera2VideoFragment();
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fragment.setRetainInstance(true);
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return fragment;
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}
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/**
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* In this sample, we choose a video size with 3x4 aspect ratio. Also, we don't use sizes larger
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* than 1080p, since MediaRecorder cannot handle such a high-resolution video.
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*
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* @param choices The list of available sizes
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* @return The video size
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*/
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private static Size chooseVideoSize(Size[] choices) {
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for (Size size : choices) {
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if (size.getWidth() == size.getHeight() * 4 / 3 && size.getWidth() <= 1080) {
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return size;
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}
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}
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Log.e(TAG, "Couldn't find any suitable video size");
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return choices[choices.length - 1];
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}
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/**
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* Given {@code choices} of {@code Size}s supported by a camera, chooses the smallest one whose
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* width and height are at least as large as the respective requested values, and whose aspect
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* ratio matches with the specified value.
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*
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* @param choices The list of sizes that the camera supports for the intended output class
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* @param width The minimum desired width
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* @param height The minimum desired height
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* @param aspectRatio The aspect ratio
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* @return The optimal {@code Size}, or an arbitrary one if none were big enough
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*/
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private static Size chooseOptimalSize(Size[] choices, int width, int height, Size aspectRatio) {
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// Collect the supported resolutions that are at least as big as the preview Surface
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List<Size> bigEnough = new ArrayList<Size>();
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int w = aspectRatio.getWidth();
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int h = aspectRatio.getHeight();
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for (Size option : choices) {
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if (option.getHeight() == option.getWidth() * h / w &&
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option.getWidth() >= width && option.getHeight() >= height) {
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bigEnough.add(option);
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}
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}
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// Pick the smallest of those, assuming we found any
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if (bigEnough.size() > 0) {
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return Collections.min(bigEnough, new CompareSizesByArea());
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} else {
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Log.e(TAG, "Couldn't find any suitable preview size");
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return choices[0];
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}
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}
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@Override
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public View onCreateView(LayoutInflater inflater, ViewGroup container,
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Bundle savedInstanceState) {
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return inflater.inflate(R.layout.fragment_camera2_video, container, false);
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}
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@Override
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public void onViewCreated(final View view, Bundle savedInstanceState) {
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mTextureView = (AutoFitTextureView) view.findViewById(R.id.texture);
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mButtonVideo = (Button) view.findViewById(R.id.video);
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mButtonVideo.setOnClickListener(this);
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view.findViewById(R.id.info).setOnClickListener(this);
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}
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@Override
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public void onResume() {
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super.onResume();
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startBackgroundThread();
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if (mTextureView.isAvailable()) {
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openCamera(mTextureView.getWidth(), mTextureView.getHeight());
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} else {
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mTextureView.setSurfaceTextureListener(mSurfaceTextureListener);
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}
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}
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@Override
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public void onPause() {
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closeCamera();
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stopBackgroundThread();
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super.onPause();
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}
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@Override
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public void onClick(View view) {
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switch (view.getId()) {
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case R.id.video: {
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if (mIsRecordingVideo) {
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stopRecordingVideo();
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} else {
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startRecordingVideo();
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}
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break;
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}
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case R.id.info: {
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Activity activity = getActivity();
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if (null != activity) {
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new AlertDialog.Builder(activity)
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.setMessage(R.string.intro_message)
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.setPositiveButton(android.R.string.ok, null)
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.show();
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}
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break;
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}
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}
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}
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/**
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* Starts a background thread and its {@link Handler}.
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*/
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private void startBackgroundThread() {
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mBackgroundThread = new HandlerThread("CameraBackground");
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mBackgroundThread.start();
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mBackgroundHandler = new Handler(mBackgroundThread.getLooper());
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}
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/**
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* Stops the background thread and its {@link Handler}.
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*/
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private void stopBackgroundThread() {
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mBackgroundThread.quitSafely();
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try {
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mBackgroundThread.join();
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mBackgroundThread = null;
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mBackgroundHandler = null;
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} catch (InterruptedException e) {
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e.printStackTrace();
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}
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}
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/**
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* Tries to open a {@link CameraDevice}. The result is listened by `mStateCallback`.
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*/
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private void openCamera(int width, int height) {
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final Activity activity = getActivity();
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if (null == activity || activity.isFinishing()) {
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return;
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}
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CameraManager manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE);
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try {
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if (!mCameraOpenCloseLock.tryAcquire(2500, TimeUnit.MILLISECONDS)) {
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throw new RuntimeException("Time out waiting to lock camera opening.");
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}
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String cameraId = manager.getCameraIdList()[0];
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// Choose the sizes for camera preview and video recording
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CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);
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StreamConfigurationMap map = characteristics
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.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
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mVideoSize = chooseVideoSize(map.getOutputSizes(MediaRecorder.class));
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mPreviewSize = chooseOptimalSize(map.getOutputSizes(SurfaceTexture.class),
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width, height, mVideoSize);
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int orientation = getResources().getConfiguration().orientation;
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if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
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mTextureView.setAspectRatio(mPreviewSize.getWidth(), mPreviewSize.getHeight());
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} else {
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mTextureView.setAspectRatio(mPreviewSize.getHeight(), mPreviewSize.getWidth());
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}
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configureTransform(width, height);
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mMediaRecorder = new MediaRecorder();
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manager.openCamera(cameraId, mStateCallback, null);
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} catch (CameraAccessException e) {
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Toast.makeText(activity, "Cannot access the camera.", Toast.LENGTH_SHORT).show();
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activity.finish();
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} catch (NullPointerException e) {
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// Currently an NPE is thrown when the Camera2API is used but not supported on the
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// device this code runs.
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new ErrorDialog().show(getFragmentManager(), "dialog");
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} catch (InterruptedException e) {
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throw new RuntimeException("Interrupted while trying to lock camera opening.");
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}
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}
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private void closeCamera() {
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try {
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mCameraOpenCloseLock.acquire();
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if (null != mCameraDevice) {
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mCameraDevice.close();
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mCameraDevice = null;
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}
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if (null != mMediaRecorder) {
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mMediaRecorder.release();
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mMediaRecorder = null;
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}
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} catch (InterruptedException e) {
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throw new RuntimeException("Interrupted while trying to lock camera closing.");
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} finally {
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mCameraOpenCloseLock.release();
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}
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}
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/**
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* Start the camera preview.
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*/
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private void startPreview() {
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if (null == mCameraDevice || !mTextureView.isAvailable() || null == mPreviewSize) {
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return;
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}
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try {
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setUpMediaRecorder();
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SurfaceTexture texture = mTextureView.getSurfaceTexture();
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assert texture != null;
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texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
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mPreviewBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_RECORD);
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List<Surface> surfaces = new ArrayList<Surface>();
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Surface previewSurface = new Surface(texture);
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surfaces.add(previewSurface);
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mPreviewBuilder.addTarget(previewSurface);
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Surface recorderSurface = mMediaRecorder.getSurface();
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surfaces.add(recorderSurface);
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mPreviewBuilder.addTarget(recorderSurface);
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mCameraDevice.createCaptureSession(surfaces, new CameraCaptureSession.StateCallback() {
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@Override
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public void onConfigured(CameraCaptureSession cameraCaptureSession) {
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mPreviewSession = cameraCaptureSession;
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updatePreview();
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}
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@Override
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public void onConfigureFailed(CameraCaptureSession cameraCaptureSession) {
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Activity activity = getActivity();
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if (null != activity) {
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Toast.makeText(activity, "Failed", Toast.LENGTH_SHORT).show();
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}
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}
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}, mBackgroundHandler);
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} catch (CameraAccessException e) {
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e.printStackTrace();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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/**
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* Update the camera preview. {@link #startPreview()} needs to be called in advance.
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*/
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private void updatePreview() {
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if (null == mCameraDevice) {
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return;
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}
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try {
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setUpCaptureRequestBuilder(mPreviewBuilder);
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HandlerThread thread = new HandlerThread("CameraPreview");
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thread.start();
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mPreviewSession.setRepeatingRequest(mPreviewBuilder.build(), null, mBackgroundHandler);
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} catch (CameraAccessException e) {
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e.printStackTrace();
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}
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}
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private void setUpCaptureRequestBuilder(CaptureRequest.Builder builder) {
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builder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
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}
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/**
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* Configures the necessary {@link android.graphics.Matrix} transformation to `mTextureView`.
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* This method should not to be called until the camera preview size is determined in
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* openCamera, or until the size of `mTextureView` is fixed.
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*
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* @param viewWidth The width of `mTextureView`
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* @param viewHeight The height of `mTextureView`
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*/
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private void configureTransform(int viewWidth, int viewHeight) {
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Activity activity = getActivity();
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if (null == mTextureView || null == mPreviewSize || null == activity) {
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return;
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}
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int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
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Matrix matrix = new Matrix();
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RectF viewRect = new RectF(0, 0, viewWidth, viewHeight);
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RectF bufferRect = new RectF(0, 0, mPreviewSize.getHeight(), mPreviewSize.getWidth());
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float centerX = viewRect.centerX();
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float centerY = viewRect.centerY();
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if (Surface.ROTATION_90 == rotation || Surface.ROTATION_270 == rotation) {
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bufferRect.offset(centerX - bufferRect.centerX(), centerY - bufferRect.centerY());
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matrix.setRectToRect(viewRect, bufferRect, Matrix.ScaleToFit.FILL);
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float scale = Math.max(
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(float) viewHeight / mPreviewSize.getHeight(),
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(float) viewWidth / mPreviewSize.getWidth());
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matrix.postScale(scale, scale, centerX, centerY);
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matrix.postRotate(90 * (rotation - 2), centerX, centerY);
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}
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mTextureView.setTransform(matrix);
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}
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private void setUpMediaRecorder() throws IOException {
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final Activity activity = getActivity();
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if (null == activity) {
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return;
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}
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mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
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mMediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
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mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
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mMediaRecorder.setOutputFile(getVideoFile(activity).getAbsolutePath());
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mMediaRecorder.setVideoEncodingBitRate(10000000);
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mMediaRecorder.setVideoFrameRate(30);
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mMediaRecorder.setVideoSize(mVideoSize.getWidth(), mVideoSize.getHeight());
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mMediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
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mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
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int rotation = activity.getWindowManager().getDefaultDisplay().getRotation();
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int orientation = ORIENTATIONS.get(rotation);
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mMediaRecorder.setOrientationHint(orientation);
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mMediaRecorder.prepare();
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}
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private File getVideoFile(Context context) {
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return new File(context.getExternalFilesDir(null), "video.mp4");
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}
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private void startRecordingVideo() {
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try {
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// UI
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mButtonVideo.setText(R.string.stop);
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mIsRecordingVideo = true;
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// Start recording
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mMediaRecorder.start();
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} catch (IllegalStateException e) {
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e.printStackTrace();
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}
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}
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private void stopRecordingVideo() {
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// UI
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mIsRecordingVideo = false;
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mButtonVideo.setText(R.string.record);
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// Stop recording
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mMediaRecorder.stop();
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mMediaRecorder.reset();
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Activity activity = getActivity();
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if (null != activity) {
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Toast.makeText(activity, "Video saved: " + getVideoFile(activity),
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Toast.LENGTH_SHORT).show();
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}
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startPreview();
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}
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/**
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* Compares two {@code Size}s based on their areas.
|
|
*/
|
|
static class CompareSizesByArea implements Comparator<Size> {
|
|
|
|
@Override
|
|
public int compare(Size lhs, Size rhs) {
|
|
// We cast here to ensure the multiplications won't overflow
|
|
return Long.signum((long) lhs.getWidth() * lhs.getHeight() -
|
|
(long) rhs.getWidth() * rhs.getHeight());
|
|
}
|
|
|
|
}
|
|
|
|
public static class ErrorDialog extends DialogFragment {
|
|
|
|
@Override
|
|
public Dialog onCreateDialog(Bundle savedInstanceState) {
|
|
final Activity activity = getActivity();
|
|
return new AlertDialog.Builder(activity)
|
|
.setMessage("This device doesn't support Camera2 API.")
|
|
.setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
|
|
@Override
|
|
public void onClick(DialogInterface dialogInterface, int i) {
|
|
activity.finish();
|
|
}
|
|
})
|
|
.create();
|
|
}
|
|
|
|
}
|
|
|
|
}
|