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, 96 insertions, 0 deletions

diff --git a/core/java/android/bluetooth/BufferConstraints.java b/core/java/android/bluetooth/BufferConstraints.java
new file mode 100644
index 000000000000..7e5ec1e78435
--- /dev/null
+++ b/core/java/android/bluetooth/BufferConstraints.java
@@ -0,0 +1,96 @@
+/*
+ * 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.Nullable;
+import android.annotation.SystemApi;
+import android.os.Parcel;
+import android.os.Parcelable;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+
+/**
+ * A parcelable collection of buffer constraints by codec type.
+ *
+ * {@hide}
+ */
+@SystemApi
+public final class BufferConstraints implements Parcelable {
+    public static final int BUFFER_CODEC_MAX_NUM = 32;
+
+    private static final String TAG = "BufferConstraints";
+
+    private Map<Integer, BufferConstraint> mBufferConstraints;
+    private List<BufferConstraint> mBufferConstraintList;
+
+    public BufferConstraints(@NonNull List<BufferConstraint>
+            bufferConstraintList) {
+
+        mBufferConstraintList = new ArrayList<BufferConstraint>(bufferConstraintList);
+        mBufferConstraints = new HashMap<Integer, BufferConstraint>();
+        for (int i = 0; i < BUFFER_CODEC_MAX_NUM; i++) {
+            mBufferConstraints.put(i, bufferConstraintList.get(i));
+        }
+    }
+
+    BufferConstraints(Parcel in) {
+        mBufferConstraintList = new ArrayList<BufferConstraint>();
+        mBufferConstraints = new HashMap<Integer, BufferConstraint>();
+        in.readList(mBufferConstraintList, BufferConstraint.class.getClassLoader());
+        for (int i = 0; i < mBufferConstraintList.size(); i++) {
+            mBufferConstraints.put(i, mBufferConstraintList.get(i));
+        }
+    }
+
+    public static final @NonNull Parcelable.Creator<BufferConstraints> CREATOR =
+            new Parcelable.Creator<BufferConstraints>() {
+                public BufferConstraints createFromParcel(Parcel in) {
+                    return new BufferConstraints(in);
+                }
+
+                public BufferConstraints[] newArray(int size) {
+                    return new BufferConstraints[size];
+                }
+            };
+
+    @Override
+    public void writeToParcel(@NonNull Parcel out, int flags) {
+        out.writeList(mBufferConstraintList);
+    }
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    /**
+     * Get the buffer constraints by codec type.
+     *
+     * @param codec Audio codec
+     * @return buffer constraints by codec type.
+     * @hide
+     */
+    @SystemApi
+    public @Nullable BufferConstraint getCodec(@BluetoothCodecConfig.SourceCodecType int codec) {
+        return mBufferConstraints.get(codec);
+    }
+}