1 /* 2 * Copyright (C) 2014 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_DUMP_STATE_H 18 #define ANDROID_AUDIO_FAST_MIXER_DUMP_STATE_H 19 20 #include <stdint.h> 21 #include "Configuration.h" 22 #include "FastThreadDumpState.h" 23 #include "FastMixerState.h" 24 25 namespace android { 26 27 // Describes the underrun status for a single "pull" attempt 28 enum FastTrackUnderrunStatus { 29 UNDERRUN_FULL, // framesReady() is full frame count, no underrun 30 UNDERRUN_PARTIAL, // framesReady() is non-zero but < full frame count, partial underrun 31 UNDERRUN_EMPTY, // framesReady() is zero, total underrun 32 }; 33 34 // Underrun counters are not reset to zero for new tracks or if track generation changes. 35 // This packed representation is used to keep the information atomic. 36 union FastTrackUnderruns { FastTrackUnderruns()37 FastTrackUnderruns() { mAtomic = 0; 38 static_assert(sizeof(FastTrackUnderruns) == sizeof(uint32_t), "FastTrackUnderrun"); } FastTrackUnderruns(const FastTrackUnderruns & copyFrom)39 FastTrackUnderruns(const FastTrackUnderruns& copyFrom) : mAtomic(copyFrom.mAtomic) { } 40 FastTrackUnderruns& operator=(const FastTrackUnderruns& rhs) 41 { if (this != &rhs) mAtomic = rhs.mAtomic; return *this; } 42 struct { 43 #define UNDERRUN_BITS 10 44 #define UNDERRUN_MASK ((1 << UNDERRUN_BITS) - 1) 45 uint32_t mFull : UNDERRUN_BITS; // framesReady() is full frame count 46 uint32_t mPartial : UNDERRUN_BITS; // framesReady() is non-zero but < full frame count 47 uint32_t mEmpty : UNDERRUN_BITS; // framesReady() is zero 48 FastTrackUnderrunStatus mMostRecent : 2; // status of most recent framesReady() 49 } mBitFields; 50 private: 51 uint32_t mAtomic; 52 }; 53 54 // Represents the dump state of a fast track 55 struct FastTrackDump { FastTrackDumpFastTrackDump56 FastTrackDump() : mFramesReady(0) { } ~FastTrackDumpFastTrackDump57 /*virtual*/ ~FastTrackDump() { } 58 FastTrackUnderruns mUnderruns; 59 size_t mFramesReady; // most recent value only; no long-term statistics kept 60 int64_t mFramesWritten; // last value from track 61 }; 62 63 struct FastMixerDumpState : FastThreadDumpState { 64 FastMixerDumpState(); 65 /*virtual*/ ~FastMixerDumpState(); 66 67 void dump(int fd) const; // should only be called on a stable copy, not the original 68 69 uint32_t mWriteSequence; // incremented before and after each write() 70 uint32_t mFramesWritten; // total number of frames written successfully 71 uint32_t mNumTracks; // total number of active fast tracks 72 uint32_t mWriteErrors; // total number of write() errors 73 uint32_t mSampleRate; 74 size_t mFrameCount; 75 uint32_t mTrackMask; // mask of active tracks 76 FastTrackDump mTracks[FastMixerState::kMaxFastTracks]; 77 }; 78 79 } // android 80 81 #endif // ANDROID_AUDIO_FAST_MIXER_DUMP_STATE_H 82