WebRTCDemo: remove unnecessary stop & start during orientation change which isn't necessary since API v14.

(required bumping minSdkVersion to 14)

This fixes a RuntimeException thrown on GalaxyNexus (but not N7, N4, or NS)
during startPreview() after the sequence of Start(), Stop(), Start(); seemingly
GN's OMX stack can't deal with parallel startPreview() & setPreviewDisplay() in
this situation.

Also:
- Only set the surface in the camera when valid
- Remove duplicate assignment
- Fix error check on voiceChannel allocation to account for multiple channel creation due to orientation change causing onDestroy()/onCreate() on the app, and rampant use of process-static holders for VoE data.

BUG=1537

Review URL: https://webrtc-codereview.appspot.com/1259005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3731 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/video_capture/android/java/org/webrtc/videoengine/VideoCaptureAndroid.java

@@ -125,7 +125,6 @@ public class VideoCaptureAndroid implements PreviewCallback, Callback {
         isCaptureRunning = true;
         previewBufferLock.unlock();
 
-        isCaptureRunning = true;
         return 0;
     }
 
@@ -135,7 +134,8 @@ public class VideoCaptureAndroid implements PreviewCallback, Callback {
         // Get the local preview SurfaceHolder from the static render class
         localPreview = ViERenderer.GetLocalRenderer();
         if (localPreview != null) {
-            if (localPreview.getSurface() != null) {
+            if (localPreview.getSurface() != null &&
+                localPreview.getSurface().isValid()) {
                 surfaceCreated(localPreview);
             }
             localPreview.addCallback(this);
@@ -210,39 +210,23 @@ public class VideoCaptureAndroid implements PreviewCallback, Callback {
     public void SetPreviewRotation(int rotation) {
         Log.v(TAG, "SetPreviewRotation:" + rotation);
 
-        if (camera != null) {
-            previewBufferLock.lock();
-            int width = 0;
-            int height = 0;
-            int framerate = 0;
-            boolean wasCaptureRunning = isCaptureRunning;
-
-            if (isCaptureRunning) {
-                width = mCaptureWidth;
-                height = mCaptureHeight;
-                framerate = mCaptureFPS;
-                StopCapture();
-            }
-
-            int resultRotation = 0;
-            if (currentDevice.frontCameraType ==
-                    VideoCaptureDeviceInfoAndroid.FrontFacingCameraType.Android23) {
-                // this is a 2.3 or later front facing camera.
-                // SetDisplayOrientation will flip the image horizontally
-                // before doing the rotation.
-                resultRotation=(360-rotation) % 360; // compensate the mirror
-            }
-            else {
-                // Back facing or 2.2 or previous front camera
-                resultRotation=rotation;
-            }
-            camera.setDisplayOrientation(resultRotation);
-
-            if (wasCaptureRunning) {
-                StartCapture(width, height, framerate);
-            }
-            previewBufferLock.unlock();
+        if (camera == null) {
+            return;
         }
+
+        int resultRotation = 0;
+        if (currentDevice.frontCameraType ==
+            VideoCaptureDeviceInfoAndroid.FrontFacingCameraType.Android23) {
+            // this is a 2.3 or later front facing camera.
+            // SetDisplayOrientation will flip the image horizontally
+            // before doing the rotation.
+            resultRotation = ( 360 - rotation ) % 360; // compensate the mirror
+        }
+        else {
+            // Back facing or 2.2 or previous front camera
+            resultRotation = rotation;
+        }
+        camera.setDisplayOrientation(resultRotation);
     }
 
     public void surfaceChanged(SurfaceHolder holder,

webrtc/video_engine/test/android/AndroidManifest.xml

@@ -18,7 +18,7 @@
         </activity>
     </application>
 
-    <uses-sdk android:minSdkVersion="10" />
+    <uses-sdk android:minSdkVersion="14" />
     <uses-permission android:name="android.permission.CAMERA"></uses-permission>
     <uses-feature android:name="android.hardware.camera" />
     <uses-feature android:name="android.hardware.camera.autofocus" />

webrtc/video_engine/test/android/src/org/webrtc/videoengineapp/WebRTCDemo.java

@@ -739,7 +739,7 @@ public class WebRTCDemo extends TabActivity implements IViEAndroidCallback,
 
         // Create channel
         voiceChannel = vieAndroidAPI.VoE_CreateChannel();
-        if (0 != voiceChannel) {
+        if (0 > voiceChannel) {
             Log.d(TAG, "VoE create channel failed");
             return -1;
         }