diff --git a/audio/2.0/default/Stream.cpp b/audio/2.0/default/Stream.cpp
index 40f67f0..f214eed 100644
--- a/audio/2.0/default/Stream.cpp
+++ b/audio/2.0/default/Stream.cpp
@@ -43,9 +43,10 @@
     mStream = nullptr;
 }
 
+// static
 Result Stream::analyzeStatus(const char* funcName, int status, int ignoreError) {
     if (status != 0 && status != -ignoreError) {
-        ALOGW("Stream %p %s: %s", mStream, funcName, strerror(-status));
+        ALOGW("Error from HAL stream in function %s: %s", funcName, strerror(-status));
     }
     switch (status) {
         case 0: return Result::OK;
@@ -229,6 +230,29 @@
     return Void();
 }
 
+Return<Result>  Stream::start() {
+    return Result::NOT_SUPPORTED;
+}
+
+Return<Result>  Stream::stop() {
+    return Result::NOT_SUPPORTED;
+}
+
+Return<void>  Stream::createMmapBuffer(int32_t minSizeFrames __unused,
+                                       createMmapBuffer_cb _hidl_cb) {
+    Result retval(Result::NOT_SUPPORTED);
+    MmapBufferInfo info;
+    _hidl_cb(retval, info);
+    return Void();
+}
+
+Return<void>  Stream::getMmapPosition(getMmapPosition_cb _hidl_cb) {
+    Result retval(Result::NOT_SUPPORTED);
+    MmapPosition position;
+    _hidl_cb(retval, position);
+    return Void();
+}
+
 } // namespace implementation
 }  // namespace V2_0
 }  // namespace audio