修复无法屏蔽声音问题，新增重启Camera接口

app/src/main/java/com/jiangdg/usbcamera/view/USBCameraActivity.java

@@ -48,6 +48,8 @@ public class USBCameraActivity extends AppCompatActivity implements CameraDialog
     public Button mBtnRecord;
     @BindView(R.id.btn_update_resolution)
     public Button mBtnUpdateResultion;
+    @BindView(R.id.btn_restart_camera)
+    Button mBtnRestartCamera;
 
     private USBCameraManager mUSBManager;
     private CameraViewInterface mUVCCameraView;
@@ -130,10 +132,23 @@ public class USBCameraActivity extends AppCompatActivity implements CameraDialog
         }
     }
 
-    @OnClick({R.id.camera_view, R.id.btn_capture_pic, R.id.btn_rec_video,R.id.btn_update_resolution})
+    @OnClick({R.id.camera_view, R.id.btn_capture_pic, R.id.btn_rec_video,R.id.btn_update_resolution,R.id.btn_restart_camera})
     public void onViewClick(View view) {
         int vId = view.getId();
         switch (vId) {
+            // 重启Camera
+            case R.id.btn_restart_camera:
+                if(mUSBManager == null)
+                    return;
+                mUSBManager.restartUSBCamera(USBCameraActivity.this, mUVCCameraView, new USBCameraManager.OnPreviewListener() {
+                    @Override
+                    public void onPreviewResult(boolean isSuccess) {
+                        if(isSuccess) {
+                            showShortMsg("重启成功");
+                        }
+                    }
+                });
+                break;
             // 切换分辨率
             case R.id.btn_update_resolution:
                 if(mUSBManager == null)

app/src/main/res/layout/activity_usbcamera.xml

@@ -45,4 +45,14 @@
         android:textSize="16sp"
         android:text="切换分辨率为320x240"/>
 
+    <Button
+        android:layout_above="@id/btn_update_resolution"
+        android:id="@+id/btn_restart_camera"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginRight="10dp"
+        android:layout_marginLeft="10dp"
+        android:textSize="16sp"
+        android:text="重启摄像头"/>
+
 </RelativeLayout>

libusbcamera/src/main/java/com/jiangdg/usbcamera/USBCameraManager.java

@@ -93,8 +93,6 @@ public class USBCameraManager{
                 if(listener != null){
                     listener.onDettachDev(device);
                 }
-                // 释放资源
-                release();
             }
 
             // 当连接到USB Camera时，被回调
@@ -162,6 +160,31 @@ public class USBCameraManager{
         });
     }
 
+    public void restartUSBCamera(Activity activity, CameraViewInterface cameraView,final OnPreviewListener mPreviewListener){
+        // 关闭摄像头
+        closeCamera();
+        // 释放CameraHandler占用的相关资源
+        if(mCameraHandler != null){
+            mCameraHandler.release();
+            mCameraHandler = null;
+        }
+        // 重新初始化mCameraHandler
+        cameraView.setAspectRatio(previewWidth / (float)previewHeight);
+        mCameraHandler = UVCCameraHandler.createHandler(activity,cameraView,ENCODER_TYPE,
+                previewWidth,previewHeight,PREVIEW_FORMAT);
+        openCamera(mCtrlBlock);
+        // 开始预览
+        startPreview(cameraView, new AbstractUVCCameraHandler.OnPreViewResultListener() {
+            @Override
+            public void onPreviewResult(boolean result) {
+                if(mPreviewListener != null){
+                    mPreviewListener.onPreviewResult(result);
+                }
+            }
+        });
+    }
+
+
     /**
      * 注册检测USB设备广播接收器
      * */

libusbcamera/src/main/java/com/serenegiant/usb/common/AbstractUVCCameraHandler.java

@@ -667,7 +667,7 @@ public  abstract class AbstractUVCCameraHandler extends Handler {
 			// 初始化混合器
 			videoPath = params.getRecordPath();
 			mMuxer = new Mp4MediaMuxer(params.getRecordPath(),
-					params.getRecordDuration() * 60 * 1000);
+					params.getRecordDuration() * 60 * 1000,params.isVoiceClose());
 
 			// 启动视频编码线程
 			startVideoRecord();

libusbcamera/src/main/java/com/serenegiant/usb/encoder/biz/Mp4MediaMuxer.java

@@ -27,10 +27,12 @@ public class Mp4MediaMuxer {
     private long mBeginMillis;
     private MediaFormat mVideoFormat;
     private MediaFormat mAudioFormat;
+    private boolean isVoiceClose;
 
     // 文件路径；文件时长
-    public Mp4MediaMuxer(String path, long durationMillis) {
+    public Mp4MediaMuxer(String path, long durationMillis,boolean isVoiceClose) {
         String mFilePath;
+        this.isVoiceClose = isVoiceClose;
         this.durationMillis = durationMillis;
         if(durationMillis != 0) {
             mFilePath = path + "-" + index++ + ".mp4";
@@ -49,11 +51,9 @@ public class Mp4MediaMuxer {
         }
     }
 
-
-
     public synchronized void addTrack(MediaFormat format, boolean isVideo) {
         // now that we have the Magic Goodies, start the muxer
-        if (mAudioTrackIndex != -1 && mVideoTrackIndex != -1)
+        if ((!isVoiceClose && mAudioTrackIndex != -1) && mVideoTrackIndex != -1)
             throw new RuntimeException("already add all tracks");
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
@@ -63,7 +63,9 @@ public class Mp4MediaMuxer {
             if (isVideo) {
                 mVideoFormat = format;
                 mVideoTrackIndex = track;
-                if (mAudioTrackIndex != -1) {
+                // 当音频轨道添加
+                // 或者开启静音就start
+                if (isVoiceClose || mAudioTrackIndex != -1) {
                     if (VERBOSE)
                         Log.i(TAG, "both audio and video added,and muxer is started");
                     mMuxer.start();
@@ -81,7 +83,7 @@ public class Mp4MediaMuxer {
     }
 
     public synchronized void pumpStream(ByteBuffer outputBuffer, MediaCodec.BufferInfo bufferInfo, boolean isVideo) {
-        if (mAudioTrackIndex == -1 || mVideoTrackIndex == -1) {
+        if ((!isVoiceClose && mAudioTrackIndex == -1) || mVideoTrackIndex == -1) {
 //            Log.i(TAG, String.format("pumpStream [%s] but muxer is not start.ignore..", isVideo ? "video" : "audio"));
             return;
         }
@@ -131,7 +133,8 @@ public class Mp4MediaMuxer {
     public synchronized void release() {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
             if (mMuxer != null) {
-                if (mAudioTrackIndex != -1 && mVideoTrackIndex != -1) {
+                //(!isVoiceClose&&mAudioTrackIndex != -1)
+                if (mVideoTrackIndex  != -1) {
                     if (VERBOSE)
                         Log.i(TAG, String.format("muxer is started. now it will be stoped."));
                     try {