OboeAudioService: add thread to service for passing timestamps
Cleanup several TODOs.
Test: test_aaudio in CTS
Change-Id: I7fc956b6a21cbb592f98e1e5a8f43ebd6926d796
Signed-off-by: Phil Burk <philburk@google.com>
diff --git a/services/oboeservice/TimestampScheduler.h b/services/oboeservice/TimestampScheduler.h
new file mode 100644
index 0000000..041e432
--- /dev/null
+++ b/services/oboeservice/TimestampScheduler.h
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 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 OBOE_TIMESTAMP_SCHEDULER_H
+#define OBOE_TIMESTAMP_SCHEDULER_H
+
+//#include <stdlib.h> // random()
+
+#include "IOboeAudioService.h"
+#include "OboeService.h"
+#include "AudioStream.h"
+#include "fifo/FifoBuffer.h"
+#include "SharedRingBuffer.h"
+#include "AudioEndpointParcelable.h"
+
+namespace oboe {
+
+/**
+ * Schedule wakeup time for monitoring the position
+ * of an MMAP/NOIRQ buffer.
+ *
+ * Note that this object is not thread safe. Only call it from a single thread.
+ */
+class TimestampScheduler
+{
+public:
+ TimestampScheduler() {};
+ virtual ~TimestampScheduler() = default;
+
+ /**
+ * Start the schedule at the given time.
+ */
+ void start(oboe_nanoseconds_t startTime);
+
+ /**
+ * Calculate the next time that the read position should be
+ * measured.
+ */
+ oboe_nanoseconds_t nextAbsoluteTime();
+
+ void setBurstPeriod(oboe_nanoseconds_t burstPeriod) {
+ mBurstPeriod = burstPeriod;
+ }
+
+ void setBurstPeriod(oboe_size_frames_t framesPerBurst,
+ oboe_sample_rate_t sampleRate) {
+ mBurstPeriod = OBOE_NANOS_PER_SECOND * framesPerBurst / sampleRate;
+ }
+
+ oboe_nanoseconds_t getBurstPeriod() {
+ return mBurstPeriod;
+ }
+
+private:
+ // Start with an arbitrary default so we do not divide by zero.
+ oboe_nanoseconds_t mBurstPeriod = OBOE_NANOS_PER_MILLISECOND;
+ oboe_nanoseconds_t mStartTime;
+ oboe_nanoseconds_t mLastTime;
+};
+
+} /* namespace oboe */
+
+#endif /* OBOE_TIMESTAMP_SCHEDULER_H */