diff --git a/audio/aidl/default/Stream.cpp b/audio/aidl/default/Stream.cpp
new file mode 100644
index 0000000..e16b2c6
--- /dev/null
+++ b/audio/aidl/default/Stream.cpp
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2022 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_TAG "AHAL_Stream"
+#define LOG_NDEBUG 0
+#include <android-base/logging.h>
+
+#include "core-impl/Stream.h"
+
+using aidl::android::hardware::audio::common::SinkMetadata;
+using aidl::android::hardware::audio::common::SourceMetadata;
+using aidl::android::media::audio::common::AudioOffloadInfo;
+
+namespace aidl::android::hardware::audio::core {
+
+StreamIn::StreamIn(const SinkMetadata& sinkMetadata) : mMetadata(sinkMetadata) {}
+
+ndk::ScopedAStatus StreamIn::close() {
+    LOG(DEBUG) << __func__;
+    if (!mIsClosed) {
+        mIsClosed = true;
+        return ndk::ScopedAStatus::ok();
+    } else {
+        LOG(ERROR) << __func__ << ": stream was already closed";
+        return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
+    }
+}
+
+ndk::ScopedAStatus StreamIn::updateMetadata(const SinkMetadata& in_sinkMetadata) {
+    LOG(DEBUG) << __func__;
+    if (!mIsClosed) {
+        mMetadata = in_sinkMetadata;
+        return ndk::ScopedAStatus::ok();
+    }
+    LOG(ERROR) << __func__ << ": stream was closed";
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
+}
+
+StreamOut::StreamOut(const SourceMetadata& sourceMetadata,
+                     const std::optional<AudioOffloadInfo>& offloadInfo)
+    : mMetadata(sourceMetadata), mOffloadInfo(offloadInfo) {}
+
+ndk::ScopedAStatus StreamOut::close() {
+    LOG(DEBUG) << __func__;
+    if (!mIsClosed) {
+        mIsClosed = true;
+        return ndk::ScopedAStatus::ok();
+    }
+    LOG(ERROR) << __func__ << ": stream was already closed";
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
+}
+
+ndk::ScopedAStatus StreamOut::updateMetadata(const SourceMetadata& in_sourceMetadata) {
+    LOG(DEBUG) << __func__;
+    if (!mIsClosed) {
+        mMetadata = in_sourceMetadata;
+        return ndk::ScopedAStatus::ok();
+    }
+    LOG(ERROR) << __func__ << ": stream was closed";
+    return ndk::ScopedAStatus::fromExceptionCode(EX_ILLEGAL_STATE);
+}
+
+}  // namespace aidl::android::hardware::audio::core