打開camera

private void openCamera(int position) { if (mCamera == null) { mCamera = Camera.open(position); int degree = getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE ? 0 : 90; mCamera.setDisplayOrientation(degree); } }

camera默認是橫屏的，所以我們要使用豎屏錄制要旋轉90度

int degree = getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE ? 0 : 90; mCamera.setDisplayOrientation(degree);

camera預覽

我們要選擇一個與我們要顯示的SurfaceView大小比例最接近的一個camera預覽大小，這里要特別注意camera支持的寬高都是寬大于高。

所以就有了下面這段選擇代碼

private Size getBestCameraResolution(Camera.Parameters parameters, Size screenResolution) { float tmp = 0f; float mindiff = 100f; Log.e('yuanVideo', 'screen height=' + screenResolution.getHeight()); float width_d_height; if (screenResolution.getWidth() > screenResolution.getHeight()) { width_d_height = (float) screenResolution.getWidth() / (float) screenResolution.getHeight(); } else { width_d_height = (float) screenResolution.getHeight() / (float) screenResolution.getWidth(); } Log.e('yuanVideo', 'width_d_height=' + width_d_height); Camera.Size best = null; List<Camera.Size> supportedPreviewSizes = parameters.getSupportedPreviewSizes(); for (Camera.Size s : supportedPreviewSizes) { tmp = Math.abs(((float) s.width / (float) s.height) - width_d_height); Log.e('yuanVideo', 'support ratio=' + tmp); if (tmp < mindiff) { mindiff = tmp; best = s; } } Log.e('yuanVideo', 'best height=' + best.height); return new Size(best.width, best.height); }

初始化MediaRecorder

private boolean prepareMediaRecorder() { // 創建MediaPlayer對象 mCamera.unlock(); mRecorder = new MediaRecorder(); mRecorder.reset(); mRecorder.setCamera(mCamera); // 設置從麥克風采集聲音(或來自錄像機的聲音AudioSource.CAMCORDER) mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC); // 設置從攝像頭采集圖像 mRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); Log.e('yuanProfile', 'QUALITY_LOW=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_LOW)); Log.e('yuanProfile', 'QUALITY_HIGH=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_HIGH)); Log.e('yuanProfile', 'QUALITY_QCIF=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_QCIF)); Log.e('yuanProfile', 'QUALITY_480P=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_480P)); Log.e('yuanProfile', 'QUALITY_720P=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_720P)); Log.e('yuanProfile', 'QUALITY_1080P=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_1080P)); Log.e('yuanProfile', 'QUALITY_QVGA=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_QVGA)); Log.e('yuanProfile', 'QUALITY_2160P=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_2160P)); Log.e('yuanProfile', 'QUALITY_VGA=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_VGA)); Log.e('yuanProfile', 'QUALITY_4KDCI=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_4KDCI)); Log.e('yuanProfile', 'QUALITY_QHD=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_QHD)); Log.e('yuanProfile', 'QUALITY_2K=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_2K)); if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_720P)) { mRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_720P)); } else if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_480P)) { mRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_1080P)); } else if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_1080P)) { mRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_480P)); } else if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_LOW)) { mRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_LOW)); } else if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_HIGH)) { mRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH)); } else { return false; } // mTempList.add(mCurrentTempRecordData); mRecorder.setOutputFile(mCurPath); mRecorder.setPreviewDisplay(activtityVideoRecordBinding.sView.getHolder().getSurface()); // ① int degree; if(getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE){ int degree ; if (cameraPosition == Camera.CameraInfo.CAMERA_FACING_FRONT) { degree = 270; } else { degree = 90; } mRecorder.setOrientationHint(degree); } try { mRecorder.prepare(); } catch (Exception e) { e.printStackTrace(); return false; } return true; }

這里也要設置視頻的旋轉參數

if(getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE){ int degree ; if (cameraPosition == Camera.CameraInfo.CAMERA_FACING_FRONT) { degree = 270; } else { degree = 90; } mRecorder.setOrientationHint(degree); }

下面是完整的代碼

package com.yuanxuzhen.ffmpeg; import android.app.Activity;import android.content.Context;import android.content.res.Configuration;import android.graphics.PixelFormat;import android.hardware.Camera;import android.media.CamcorderProfile;import android.media.MediaRecorder;import android.os.Build;import android.os.Bundle;import android.util.DisplayMetrics;import android.util.Log;import android.util.Size;import android.view.SurfaceHolder;import android.view.View;import android.view.Window;import android.view.WindowManager; import androidx.annotation.NonNull;import androidx.annotation.Nullable;import androidx.annotation.RequiresApi; import com.yuanxuzhen.ffmpeg.databinding.ActivtityVideoRecordBinding; import java.io.File;import java.io.IOException;import java.util.List;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors; public class VideoRecordActivity extends Activity { ActivtityVideoRecordBinding activtityVideoRecordBinding; MediaRecorder mRecorder; private boolean isRecording = false; private int cameraPosition = Camera.CameraInfo.CAMERA_FACING_FRONT;//0代表前置攝像頭，1代表后置攝像頭 private Camera mCamera; private Camera.Parameters mParameters; private String mCurPath = null; private VideoTempRecordData mCurrentTempRecordData = null; @Override protected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);getWindow().setFormat(PixelFormat.TRANSLUCENT);mCurPath = DirUtil.getCacheDir(this) + File.separator + 'out.mp4';activtityVideoRecordBinding = ActivtityVideoRecordBinding.inflate(getLayoutInflater());setContentView(activtityVideoRecordBinding.getRoot());activtityVideoRecordBinding.sView.getHolder().setKeepScreenOn(true);activtityVideoRecordBinding.sView.getHolder().addCallback(new SurfaceHolder.Callback() { @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) @Override public void surfaceCreated(@NonNull SurfaceHolder holder) {openPreView(); } @Override public void surfaceChanged(SurfaceHolder surfaceHolder, int format, int width, int height) {Log.e('yuanVideo', 'surfaceChanged height=' + height); } @Override public void surfaceDestroyed(@NonNull SurfaceHolder holder) { }}); activtityVideoRecordBinding.recordOrStop.setText('開始');activtityVideoRecordBinding.recordOrStop.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) {if (isRecording) { Log.d('TAG', '停止錄像'); stopRecord();} else { startRecord();} }});activtityVideoRecordBinding.change.setOnClickListener(new View.OnClickListener() { @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) @Override public void onClick(View v) {if(isRecording){ return;}releaseCamera();cameraPosition = cameraPosition == Camera.CameraInfo.CAMERA_FACING_FRONT ? Camera.CameraInfo.CAMERA_FACING_BACK : Camera.CameraInfo.CAMERA_FACING_FRONT;openCamera(cameraPosition);openPreView(); }}); } /** * 1.打開相機 */ private void openCamera(int position) {if (mCamera == null) { mCamera = Camera.open(position); int degree = getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE ? 0 : 90; mCamera.setDisplayOrientation(degree);} } /** * initCameraAndSurfaceViewHolder初始化hoder后 * 2.設置預覽功能 */ @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) private void openPreView() {try { if (mCamera != null) {mParameters = mCamera.getParameters();mCamera.setPreviewDisplay(activtityVideoRecordBinding.sView.getHolder());Size screenPoint = getScreenMetrics(VideoRecordActivity.this);Size bestPreviewSize = getBestCameraResolution(mCamera.getParameters(), screenPoint);mParameters.setPreviewSize(bestPreviewSize.getWidth(), bestPreviewSize.getHeight());mCamera.setParameters(mParameters);mCamera.startPreview();mCamera.autoFocus(new Camera.AutoFocusCallback() { @Override public void onAutoFocus(boolean success, Camera camera) {Log.e('yuanVideo', 'autoFocus success=' + success); }}); mCamera.setPreviewCallback(new Camera.PreviewCallback() { @Override public void onPreviewFrame(byte[] data, Camera camera) {Log.i('TAG', '獲取預覽幀...');Log.d('TAG', '預覽幀大小：' + String.valueOf(data.length)); }}); }} catch (IOException e) { e.printStackTrace();} } private boolean prepareMediaRecorder() {// 創建MediaPlayer對象mCamera.unlock();mRecorder = new MediaRecorder();mRecorder.reset();mRecorder.setCamera(mCamera); // 設置從麥克風采集聲音(或來自錄像機的聲音AudioSource.CAMCORDER)mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);// 設置從攝像頭采集圖像mRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);Log.e('yuanProfile', 'QUALITY_LOW=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_LOW));Log.e('yuanProfile', 'QUALITY_HIGH=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_HIGH));Log.e('yuanProfile', 'QUALITY_QCIF=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_QCIF));Log.e('yuanProfile', 'QUALITY_480P=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_480P));Log.e('yuanProfile', 'QUALITY_720P=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_720P));Log.e('yuanProfile', 'QUALITY_1080P=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_1080P));Log.e('yuanProfile', 'QUALITY_QVGA=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_QVGA));Log.e('yuanProfile', 'QUALITY_2160P=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_2160P));Log.e('yuanProfile', 'QUALITY_VGA=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_VGA));Log.e('yuanProfile', 'QUALITY_4KDCI=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_4KDCI));Log.e('yuanProfile', 'QUALITY_QHD=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_QHD));Log.e('yuanProfile', 'QUALITY_2K=' + CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_2K)); if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_720P)) { mRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_720P));} else if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_480P)) { mRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_1080P));} else if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_1080P)) { mRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_480P));} else if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_LOW)) { mRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_LOW));} else if (CamcorderProfile.hasProfile(CamcorderProfile.QUALITY_HIGH)) { mRecorder.setProfile(CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH));} else { return false;}//mTempList.add(mCurrentTempRecordData);mRecorder.setOutputFile(mCurPath);mRecorder.setPreviewDisplay(activtityVideoRecordBinding.sView.getHolder().getSurface()); // ① if(getResources().getConfiguration().orientation != Configuration.ORIENTATION_LANDSCAPE){ int degree ; if (cameraPosition == Camera.CameraInfo.CAMERA_FACING_FRONT) {degree = 270; } else {degree = 90; } mRecorder.setOrientationHint(degree);} try { mRecorder.prepare();} catch (Exception e) { e.printStackTrace(); return false;}return true; } private void startRecord() {if (prepareMediaRecorder()) { mRecorder.start(); isRecording = true; activtityVideoRecordBinding.recordOrStop.setText('停止');} else { releaseMediaRecorder(); isRecording = false; activtityVideoRecordBinding.recordOrStop.setText('開始');} } private void stopRecord() {if (mRecorder == null) { return;}mRecorder.stop();releaseMediaRecorder();isRecording = false;activtityVideoRecordBinding.recordOrStop.setText('開始'); } @Nullable @Override public CharSequence onCreateDescription() {return super.onCreateDescription(); } @Override protected void onDestroy() {releaseCamera();releaseMediaRecorder();super.onDestroy(); } /** * 釋放相機資源 */ private void releaseCamera() {if (mCamera != null) { mCamera.setPreviewCallback(null); mCamera.stopPreview(); mCamera.release(); mCamera = null;} } private void releaseMediaRecorder() {if (mRecorder != null) { mRecorder.reset(); mRecorder.release(); mRecorder = null; mCamera.lock();} } @Override protected void onResume() {super.onResume();openCamera(cameraPosition); } @Override protected void onPause() {super.onPause();releaseMediaRecorder();releaseCamera(); } /** * 獲取最佳預覽大小 * * @param parameters 相機參數 * @param screenResolution 屏幕寬高 * @return */ @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) private Size getBestCameraResolution(Camera.Parameters parameters, Size screenResolution) {float tmp = 0f; float mindiff = 100f;Log.e('yuanVideo', 'screen height=' + screenResolution.getHeight()); float width_d_height;if (screenResolution.getWidth() > screenResolution.getHeight()) { width_d_height = (float) screenResolution.getWidth() / (float) screenResolution.getHeight();} else { width_d_height = (float) screenResolution.getHeight() / (float) screenResolution.getWidth();}Log.e('yuanVideo', 'width_d_height=' + width_d_height); Camera.Size best = null; List<Camera.Size> supportedPreviewSizes = parameters.getSupportedPreviewSizes();for (Camera.Size s : supportedPreviewSizes) { tmp = Math.abs(((float) s.width / (float) s.height) - width_d_height); Log.e('yuanVideo', 'support ratio=' + tmp); if (tmp < mindiff) {mindiff = tmp; best = s; } }Log.e('yuanVideo', 'best height=' + best.height); return new Size(best.width, best.height); } /** * 獲取屏幕寬度和高度，單位為px * * @param context * @return */ @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP) public static Size getScreenMetrics(Context context) {DisplayMetrics dm = context.getResources().getDisplayMetrics(); int w_screen = dm.widthPixels; int h_screen = dm.heightPixels; return new Size(w_screen, h_screen); } }

布局

<?xml version='1.0' encoding='utf-8'?><RelativeLayout xmlns:android='http://schemas.android.com/apk/res/android' android:orientation='vertical' android:layout_width='match_parent' android:layout_height='match_parent'> <!-- 顯示視頻預覽的SurfaceView --> <com.yuanxuzhen.ffmpeg.ResizeAbleSurfaceViewandroid: android:layout_width='match_parent'android:layout_height='match_parent'android:layout_centerInParent='true'/> <RelativeLayoutandroid:layout_width='match_parent'android:layout_height='wrap_content'android:layout_alignParentTop='true'><TextView android: android:layout_width='wrap_content' android:layout_height='wrap_content' android:text='0秒' android:layout_centerInParent='true' android:textColor='@color/white' /><Button android: android:layout_width='wrap_content' android:layout_height='66dp' android:text='切換攝像頭' android:layout_alignParentEnd='true' /> </RelativeLayout> <LinearLayoutandroid:orientation='horizontal'android:layout_width='wrap_content'android:layout_height='wrap_content'android:gravity='center_horizontal'android:layout_alignParentBottom='true'android:layout_centerHorizontal='true'><Button android: android:layout_width='66dp' android:layout_height='66dp' android:text='錄制' /><Button android: android:layout_width='66dp' android:layout_height='66dp' android:text='保存' /> </LinearLayout></RelativeLayout>

package com.yuanxuzhen.ffmpeg; import android.content.Context;import android.util.AttributeSet;import android.view.SurfaceView; public class ResizeAbleSurfaceView extends SurfaceView { private int mWidth = -1; private int mHeight = -1; public ResizeAbleSurfaceView(Context context) {super(context); } public ResizeAbleSurfaceView(Context context, AttributeSet attrs) {super(context, attrs); } public ResizeAbleSurfaceView(Context context, AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {if (-1 == mWidth || -1 == mHeight) { super.onMeasure(widthMeasureSpec, heightMeasureSpec);}else { setMeasuredDimension(mWidth, mHeight);} } public void resize(int width, int height) {mWidth = width;mHeight = height;getHolder().setFixedSize(width, height);requestLayout();invalidate(); } }

package com.yuanxuzhen.ffmpeg; import android.content.Context;import android.os.Environment; import java.io.File; public class DirUtil { public static final String WEBVIEW_CACHE = '.webviewCache'; public static final String IMAGE_PATH = 'image'; public static final String DOWNLOAD_PATH = 'download'; public static final String VIDEO_PATH = '.video'; public static final String NET_PATH = '.net'; //image public static String getImageDir(Context context) {return getCacheDir(context) + File.separator + IMAGE_PATH; } //webview public static String getWebviewCache(Context context) {return getCacheDir(context) + File.separator + WEBVIEW_CACHE; } //download public static String getDownloadDir(Context context) {return getCacheDir(context) + File.separator + DOWNLOAD_PATH; } //video public static String getVideoPath(Context context) {return getCacheDir(context) + File.separator + VIDEO_PATH; } //net public static String getNetPath(Context context) {return getCacheDir(context) + File.separator + NET_PATH; } public static String getCacheDir(Context context) { if (context == null) { return '';}String path = null;if (context.getExternalCacheDir() != null&& (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())|| !Environment.isExternalStorageRemovable())) { //外部存儲可用 path = context.getExternalCacheDir().getPath();} else { //內部存儲不可用 path = context.getCacheDir().getPath();}return path; } }

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