Audio : Add remote submix stream implementation

Bug: 286914845
Test: atest VtsHalAudioCoreTargetTest
Change-Id: Ia477458193ade9068eaf56e953ab670fee53cc7d
diff --git a/audio/aidl/default/r_submix/RemoteSubmixUtils.h b/audio/aidl/default/r_submix/RemoteSubmixUtils.h
new file mode 100644
index 0000000..952a992
--- /dev/null
+++ b/audio/aidl/default/r_submix/RemoteSubmixUtils.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+
+#pragma once
+
+#include <aidl/android/media/audio/common/AudioChannelLayout.h>
+#include <aidl/android/media/audio/common/AudioFormatDescription.h>
+
+using aidl::android::media::audio::common::AudioChannelLayout;
+
+namespace aidl::android::hardware::audio::core::r_submix {
+
+bool isChannelMaskSupported(const AudioChannelLayout& channelMask);
+
+bool isSampleRateSupported(int sampleRate);
+
+}  // namespace aidl::android::hardware::audio::core::r_submix