To avoid the JNI memory leaks in video editor codes

There is a protential memory leak in video editor JNI codes.
When importing so many video clips, the number of local reference
will exceed 512, which will cause the Dalvik virtual machine
crash. The patch will free each local reference when it's no
longer used to avoid memory leaks.

Change-Id: Iecd986c83f05a1103641746d6d43eef0a9c5ee40
Author: Wei Feng <wei.feng@intel.com>
Signed-off-by: Wei Feng <wei.feng@intel.com>
Singed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 40786

Author: wayfeng

media/jni/mediaeditor/VideoEditorClasses.cpp

@@ -1853,6 +1853,9 @@ videoEditClasses_getEditSettings(
                             // Get the clip settings.
                             videoEditClasses_getClipSettings(pResult, pEnv, clipSettings,
                                 &pSettings->pClipList[i]);
+
+                            // Free the local references to avoid memory leaks
+                            pEnv->DeleteLocalRef(clipSettings);
                         }
                     }
                 }
@@ -1877,6 +1880,9 @@ videoEditClasses_getEditSettings(
                             // Get the transition settings.
                             videoEditClasses_getTransitionSettings(pResult, pEnv,
                                     transitionSettings, &pSettings->pTransitionList[i]);
+
+                            // Free the local references to avoid memory leaks
+                            pEnv->DeleteLocalRef(transitionSettings);
                         }
                     }
                 }
@@ -1900,6 +1906,9 @@ videoEditClasses_getEditSettings(
                             // Get the effect settings.
                             videoEditClasses_getEffectSettings(pResult, pEnv, effectSettings,
                                     &pSettings->Effects[i]);
+
+                            // Free the local references to avoid memory leaks
+                            pEnv->DeleteLocalRef(effectSettings);
                         }
                     }
                 }

media/jni/mediaeditor/VideoEditorJava.cpp

@@ -387,6 +387,9 @@ videoEditJava_getString(
                 (*pLength) = length;
             }
         }
+
+        // Delete local references to avoid memory leaks
+        pEnv->DeleteLocalRef(string);
     }
 
     // Return the string.

media/jni/mediaeditor/VideoEditorMain.cpp

@@ -380,6 +380,9 @@ getClipSetting(
                     pEnv->GetIntField(object,fid);
    M4OSA_TRACE1_1("videoRotation = %d",
                     pSettings->ClipProperties.videoRotationDegrees);
+
+   // Free the local references to avoid memory leaks
+   pEnv->DeleteLocalRef(clazz);
 }
 
 static void jniPreviewProgressCallback (void* cookie, M4OSA_UInt32 msgType,
@@ -1849,7 +1852,9 @@ videoEditor_populateSettings(
                 "not initialized");
             if (needToBeLoaded) {
                 getClipSetting(pEnv,properties, pContext->pEditSettings->pClipList[i]);
+                pEnv->DeleteLocalRef(properties);
             } else {
+                pEnv->DeleteLocalRef(properties);
                 goto videoEditor_populateSettings_cleanup;
             }
         }