Add AMediaFormat functions to clear and copy

Also move NdkMediaFormat internals to libmedia to avoid a future circular
dependency between libmedia and libmediandk.

Bug: 111407253
Test: build, boot, play some files

Change-Id: I54d91439f216c3834726e5505afef40dc0d93e67
diff --git a/media/libmedia/NdkMediaFormatPriv.cpp b/media/libmedia/NdkMediaFormatPriv.cpp
new file mode 100644
index 0000000..3c84d6a
--- /dev/null
+++ b/media/libmedia/NdkMediaFormatPriv.cpp
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//#define LOG_NDEBUG 0
+#define LOG_TAG "NdkMediaFormat"
+
+#include <inttypes.h>
+
+//#include <ndk/include/media/NdkMediaFormat.h>
+
+#include <utils/Log.h>
+#include <utils/StrongPointer.h>
+#include <media/NdkMediaFormatPriv.h>
+#include <media/stagefright/foundation/ABuffer.h>
+#include <media/stagefright/foundation/AMessage.h>
+//#include <android_runtime/AndroidRuntime.h>
+//#include <android_util_Binder.h>
+
+#include <jni.h>
+
+using namespace android;
+
+extern "C" {
+
+// private functions for conversion to/from AMessage
+AMediaFormat* AMediaFormat_fromMsg(const void* data) {
+    ALOGV("private ctor");
+    AMediaFormat* mData = new AMediaFormat();
+    mData->mFormat = *((sp<AMessage>*)data);
+    if (mData->mFormat == NULL) {
+        ALOGW("got NULL format");
+        mData->mFormat = new AMessage;
+    }
+    return mData;
+}
+
+void AMediaFormat_getFormat(const AMediaFormat* mData, void* dest) {
+    *((sp<AMessage>*)dest) = mData->mFormat;
+}
+
+} // extern "C"
+
+