diff --git a/media/libaudiousecasevalidation/UsecaseLookup.cpp b/media/libaudiousecasevalidation/UsecaseLookup.cpp
new file mode 100644
index 0000000..9def180
--- /dev/null
+++ b/media/libaudiousecasevalidation/UsecaseLookup.cpp
@@ -0,0 +1,79 @@
+#define LOG_TAG "UsecaseLookup"
+// #define LOG_NDEBUG 0
+
+#include "media/UsecaseLookup.h"
+
+#include <utils/Log.h>
+
+namespace android {
+namespace media {
+
+/**
+ * Add streamId and outputFlags to stream list.
+ */
+void UsecaseLookup::addStream(STREAMID streamId, bool outputFlagGame) {
+    ALOGV("%s streamId: %d outputFlagGame: %d", __func__, streamId, outputFlagGame);
+
+    mutex_lock lock(m_mutex);
+    m_streams[streamId] = outputFlagGame;
+}
+
+/**
+ * Remove streamId from stream list.
+ */
+void UsecaseLookup::removeStream(STREAMID streamId) {
+    ALOGV("%s streamId: %d ", __func__, streamId);
+
+    mutex_lock lock(m_mutex);
+    m_streams.erase(streamId);
+
+    // Shouldn't happen but it might.
+    for (auto it = m_tracks.begin(); it != m_tracks.end();) {
+        if (it->second == streamId) {
+            it = m_tracks.erase(it);
+        } else {
+            it++;
+        }
+    }
+}
+
+/**
+ * Add streamId and portId to track list.
+ */
+void UsecaseLookup::addTrack(STREAMID streamId, PORTID portId) {
+    ALOGV("%s streamId: %d portId: %d", __func__, streamId, portId);
+
+    mutex_lock lock(m_mutex);
+
+    if (m_tracks.find(portId) == m_tracks.end()) {
+        m_tracks[portId] = streamId;
+    }
+}
+
+/**
+ * Remove streamId and portId from track list.
+ */
+void UsecaseLookup::removeTrack(STREAMID streamId, PORTID portId) {
+    ALOGV("%s streamId: %d portId: %d", __func__, streamId, portId);
+
+    mutex_lock lock(m_mutex);
+    auto it = m_tracks.find(portId);
+
+    if (it != m_tracks.end() && it->second == streamId) {
+        m_tracks.erase(portId);
+    }
+}
+
+/**
+ * Check if stream list contains streamId with Game outputFlag.
+ */
+bool UsecaseLookup::isGameStream(STREAMID streamId) {
+    ALOGV("%s streamId: %d ", __func__, streamId);
+    mutex_lock lock(m_mutex);
+    auto it = m_streams.find(streamId);
+
+    return (it != m_streams.end()) ? it->second : false;
+}
+
+}  // namespace media
+}  // namespace android