FastMixer.h revision 97b5d0d5b5ef766eb5dd680d05a5d199662d4ae0 
1/*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_AUDIO_FAST_MIXER_H
18#define ANDROID_AUDIO_FAST_MIXER_H
19
20#include <utils/Thread.h>
21extern "C" {
22#include "../private/bionic_futex.h"
23}
24#include "StateQueue.h"
25#include "FastMixerState.h"
26
27namespace android {
28
29typedef StateQueue<FastMixerState> FastMixerStateQueue;
30
31class FastMixer : public Thread {
32
33public:
34            FastMixer() : Thread(false /*canCallJava*/) { }
35    virtual ~FastMixer() { }
36
37            FastMixerStateQueue* sq() { return &mSQ; }
38
39private:
40    virtual bool                threadLoop();
41            FastMixerStateQueue mSQ;
42
43};  // class FastMixer
44
45// The FastMixerDumpState keeps a cache of FastMixer statistics that can be logged by dumpsys.
46// Since used non-atomically, only POD types are permitted, and the contents can't be trusted.
47// It has a different lifetime than the FastMixer, and so it can't be a member of FastMixer.
48struct FastMixerDumpState {
49    FastMixerDumpState();
50    /*virtual*/ ~FastMixerDumpState();
51
52    void dump(int fd);
53
54    FastMixerState::Command mCommand;   // current command
55    uint32_t mWriteSequence;    // incremented before and after each write()
56    uint32_t mFramesWritten;    // total number of frames written successfully
57    uint32_t mNumTracks;        // total number of active fast tracks
58    uint32_t mWriteErrors;      // total number of write() errors
59    uint32_t mUnderruns;        // total number of underruns
60    uint32_t mOverruns;         // total number of overruns
61#ifdef FAST_MIXER_STATISTICS
62    // cycle times in seconds
63    float    mMean;
64    float    mMinimum;
65    float    mMaximum;
66    float    mStddev;
67#endif
68};
69
70}   // namespace android
71
72#endif  // ANDROID_AUDIO_FAST_MIXER_H
73