liboboe: initial checkin of core and legacy files.
Oboe C++ files that calls AudioTrack and AudioRecord.
Main C API implemented by src/core/OboeAudio.cpp
Test: gunit tests for the Legacy mode and handle tracker in tests folder
Bug: 33347409
Change-Id: I50f9fd99377efbd8de6fef1601e9af4c22c6ab46
Signed-off-by: Phil Burk <philburk@google.com>
diff --git a/media/liboboe/src/utility/MonotonicCounter.h b/media/liboboe/src/utility/MonotonicCounter.h
new file mode 100644
index 0000000..befad21
--- /dev/null
+++ b/media/liboboe/src/utility/MonotonicCounter.h
@@ -0,0 +1,91 @@
+/*
+ * Copyright 2016 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.
+ */
+
+#ifndef UTILITY_MONOTONICCOUNTER_H
+#define UTILITY_MONOTONICCOUNTER_H
+
+#include <stdint.h>
+
+/**
+ * Maintain a 64-bit monotonic counter.
+ * Can be used to track a 32-bit counter that wraps or gets reset.
+ *
+ * Note that this is not atomic and has no interior locks.
+ * A caller will need to provide their own exterior locking
+ * if they need to use it from multiple threads.
+ */
+class MonotonicCounter {
+
+public:
+ MonotonicCounter() {};
+ virtual ~MonotonicCounter() {};
+
+ /**
+ * @return current value of the counter
+ */
+ int64_t get() const {
+ return mCounter64;
+ }
+
+ /**
+ * Advance the counter if delta is positive.
+ * @return current value of the counter
+ */
+ int64_t increment(int64_t delta) {
+ if (delta > 0) {
+ mCounter64 += delta;
+ }
+ return mCounter64;
+ }
+
+ /**
+ * Advance the 64-bit counter if (current32 - previousCurrent32) > 0.
+ * This can be used to convert a 32-bit counter that may be wrapping into
+ * a monotonic 64-bit counter.
+ *
+ * This counter32 should NOT be allowed to advance by more than 0x7FFFFFFF between calls.
+ * Think of the wrapping counter like a sine wave. If the frequency of the signal
+ * is more than half the sampling rate (Nyquist rate) then you cannot measure it properly.
+ * If the counter wraps around every 24 hours then we should measure it with a period
+ * of less than 12 hours.
+ *
+ * @return current value of the 64-bit counter
+ */
+ int64_t update32(int32_t counter32) {
+ int32_t delta = counter32 - mCounter32;
+ // protect against the mCounter64 going backwards
+ if (delta > 0) {
+ mCounter64 += delta;
+ mCounter32 = counter32;
+ }
+ return mCounter64;
+ }
+
+ /**
+ * Reset the stored value of the 32-bit counter.
+ * This is used if your counter32 has been reset to zero.
+ */
+ void reset32() {
+ mCounter32 = 0;
+ }
+
+private:
+ int64_t mCounter64 = 0;
+ int32_t mCounter32 = 0;
+};
+
+
+#endif //UTILITY_MONOTONICCOUNTER_H