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/ndk/NdkMediaFormat.cpp b/media/ndk/NdkMediaFormat.cpp
index f32b83e..a66f3b3 100644
--- a/media/ndk/NdkMediaFormat.cpp
+++ b/media/ndk/NdkMediaFormat.cpp
@@ -20,6 +20,7 @@
 #include <inttypes.h>
 
 #include <media/NdkMediaFormat.h>
+#include <media/NdkMediaFormatPriv.h>
 
 #include <utils/Log.h>
 #include <utils/StrongPointer.h>
@@ -32,12 +33,6 @@
 
 using namespace android;
 
-struct AMediaFormat {
-    sp<AMessage> mFormat;
-    String8 mDebug;
-    KeyedVector<String8, String8> mStringCache;
-};
-
 extern "C" {
 
 // private functions for conversion to/from AMessage
@@ -74,6 +69,18 @@
     return AMEDIA_OK;
 }
 
+EXPORT
+void AMediaFormat_clear(AMediaFormat *format) {
+    format->mFormat->clear();
+}
+
+EXPORT
+media_status_t AMediaFormat_copy(AMediaFormat *to, AMediaFormat *from) {
+    to->mFormat->clear();
+    to->mFormat->extend(from->mFormat);
+    return AMEDIA_OK;
+}
+
 
 EXPORT
 const char* AMediaFormat_toString(AMediaFormat *mData) {
@@ -256,7 +263,7 @@
 }
 
 EXPORT
-void AMediaFormat_setBuffer(AMediaFormat* format, const char* name, void* data, size_t size) {
+void AMediaFormat_setBuffer(AMediaFormat* format, const char* name, const void* data, size_t size) {
     // the ABuffer(void*, size_t) constructor doesn't take ownership of the data, so create
     // a new buffer and copy the data into it
     sp<ABuffer> buf = new ABuffer(size);