Fast mixer
Change-Id: I61552f83507e08e4c706076b9fb15362869e6265
diff --git a/services/audioflinger/FastMixer.h b/services/audioflinger/FastMixer.h
new file mode 100644
index 0000000..b24f2eb
--- /dev/null
+++ b/services/audioflinger/FastMixer.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2012 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 ANDROID_AUDIO_FAST_MIXER_H
+#define ANDROID_AUDIO_FAST_MIXER_H
+
+#include <utils/Thread.h>
+extern "C" {
+#include "../private/bionic_futex.h"
+}
+#include "StateQueue.h"
+#include "FastMixerState.h"
+
+namespace android {
+
+typedef StateQueue<FastMixerState> FastMixerStateQueue;
+
+class FastMixer : public Thread {
+
+public:
+ FastMixer() : Thread(false /*canCallJava*/) { }
+ virtual ~FastMixer() { }
+
+ FastMixerStateQueue* sq() { return &mSQ; }
+
+private:
+ virtual bool threadLoop();
+ FastMixerStateQueue mSQ;
+
+}; // class FastMixer
+
+// The FastMixerDumpState keeps a cache of FastMixer statistics that can be logged by dumpsys.
+// Since used non-atomically, only POD types are permitted, and the contents can't be trusted.
+// It has a different lifetime than the FastMixer, and so it can't be a member of FastMixer.
+struct FastMixerDumpState {
+ FastMixerDumpState();
+ /*virtual*/ ~FastMixerDumpState();
+
+ void dump(int fd);
+
+ FastMixerState::Command mCommand; // current command
+ uint32_t mWriteSequence; // incremented before and after each write()
+ uint32_t mFramesWritten; // total number of frames written successfully
+ uint32_t mNumTracks; // total number of active fast tracks
+ uint32_t mWriteErrors; // total number of write() errors
+ uint32_t mUnderruns; // total number of underruns
+ uint32_t mOverruns; // total number of overruns
+#ifdef FAST_MIXER_STATISTICS
+ // cycle times in seconds
+ float mMean;
+ float mMinimum;
+ float mMaximum;
+ float mStddev;
+#endif
+};
+
+} // namespace android
+
+#endif // ANDROID_AUDIO_FAST_MIXER_H