Codec Extensibility A2DP HAL Reference Implementation
Test: m
Bug: 297037759
Change-Id: I84b32c2ef22da8c3e920e497501b9f16feaf803c
diff --git a/bluetooth/audio/aidl/default/A2dpBits.h b/bluetooth/audio/aidl/default/A2dpBits.h
new file mode 100644
index 0000000..f467c95
--- /dev/null
+++ b/bluetooth/audio/aidl/default/A2dpBits.h
@@ -0,0 +1,73 @@
+/*
+ * 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
+
+namespace aidl::android::hardware::bluetooth::audio {
+
+class A2dpBits {
+ const uint8_t* cdata_;
+ uint8_t* data_;
+
+ public:
+ A2dpBits(const std::vector<uint8_t>& vector) : cdata_(vector.data()) {}
+
+ A2dpBits(std::vector<uint8_t>& vector)
+ : cdata_(vector.data()), data_(vector.data()) {}
+
+ struct Range {
+ const int first, len;
+ constexpr Range(int first, int last)
+ : first(first), len(last - first + 1) {}
+ constexpr Range(int index) : first(index), len(1) {}
+ };
+
+ constexpr bool get(int bit) const {
+ return (cdata_[bit >> 3] >> (7 - (bit & 7))) & 1;
+ }
+
+ constexpr unsigned get(const Range& range) const {
+ unsigned v(0);
+ for (int i = 0; i < range.len; i++)
+ v |= get(range.first + i) << ((range.len - 1) - i);
+ return v;
+ }
+
+ constexpr void set(int bit, int value = 1) {
+ uint8_t m = 1 << (7 - (bit & 7));
+ if (value)
+ data_[bit >> 3] |= m;
+ else
+ data_[bit >> 3] &= ~m;
+ }
+
+ constexpr void set(const Range& range, int value) {
+ for (int i = 0; i < range.len; i++)
+ set(range.first + i, (value >> ((range.len - 1) - i)) & 1);
+ }
+
+ constexpr int find_active_bit(const Range& range) const {
+ unsigned v = get(range);
+ int i = 0;
+ for (; i < range.len && ((v >> i) & 1) == 0; i++)
+ ;
+ return i < range.len && (v ^ (1 << i)) == 0
+ ? range.first + (range.len - 1) - i
+ : -1;
+ }
+};
+
+} // namespace aidl::android::hardware::bluetooth::audio