Dynamic Audio Buffer (1/3)

Add APIs in BluetoothA2dp to:
1. Get the supported type of the dynamic audio buffer.
2. Get the dynamic audio buffer millis.
3. Set dynamic audio buffer millis.

Add BufferConstraints class to access the buffer millis of different
codec.

Bug: 163968696
Tag: #feature
Test: Run dynamic audio buffer test
Change-Id: If097d94be861dbb0c4d8f67fe7caf70a99093e34

1 files changed, 105 insertions, 0 deletions

diff --git a/framework/java/android/bluetooth/BufferConstraint.java b/framework/java/android/bluetooth/BufferConstraint.java
new file mode 100644
index 0000000000..cbffc788c3
--- /dev/null
+++ b/framework/java/android/bluetooth/BufferConstraint.java
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+package android.bluetooth;
+
+import android.annotation.NonNull;
+import android.annotation.SystemApi;
+import android.os.Parcel;
+import android.os.Parcelable;
+
+/**
+ * Stores a codec's constraints on buffering length in milliseconds.
+ *
+ * {@hide}
+ */
+@SystemApi
+public final class BufferConstraint implements Parcelable {
+
+    private static final String TAG = "BufferConstraint";
+    private int mDefaultMillis;
+    private int mMaxMillis;
+    private int mMinMillis;
+
+    public BufferConstraint(int defaultMillis, int maxMillis,
+            int minMillis) {
+        mDefaultMillis = defaultMillis;
+        mMaxMillis = maxMillis;
+        mMinMillis = minMillis;
+    }
+
+    BufferConstraint(Parcel in) {
+        mDefaultMillis = in.readInt();
+        mMaxMillis = in.readInt();
+        mMinMillis = in.readInt();
+    }
+
+    public static final @NonNull Parcelable.Creator<BufferConstraint> CREATOR =
+            new Parcelable.Creator<BufferConstraint>() {
+                public BufferConstraint createFromParcel(Parcel in) {
+                    return new BufferConstraint(in);
+                }
+
+                public BufferConstraint[] newArray(int size) {
+                    return new BufferConstraint[size];
+                }
+            };
+
+    @Override
+    public void writeToParcel(@NonNull Parcel out, int flags) {
+        out.writeInt(mDefaultMillis);
+        out.writeInt(mMaxMillis);
+        out.writeInt(mMinMillis);
+    }
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    /**
+     * Get the default buffer millis
+     *
+     * @return default buffer millis
+     * @hide
+     */
+    @SystemApi
+    public int getDefaultMillis() {
+        return mDefaultMillis;
+    }
+
+    /**
+     * Get the maximum buffer millis
+     *
+     * @return maximum buffer millis
+     * @hide
+     */
+    @SystemApi
+    public int getMaxMillis() {
+        return mMaxMillis;
+    }
+
+    /**
+     * Get the minimum buffer millis
+     *
+     * @return minimum buffer millis
+     * @hide
+     */
+    @SystemApi
+    public int getMinMillis() {
+        return mMinMillis;
+    }
+}