diff options
Diffstat (limited to 'services/audioflinger/FastMixer.h')
| -rw-r--r-- | services/audioflinger/FastMixer.h | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/services/audioflinger/FastMixer.h b/services/audioflinger/FastMixer.h index 8a8fcb8..a6dd310 100644 --- a/services/audioflinger/FastMixer.h +++ b/services/audioflinger/FastMixer.h @@ -42,8 +42,23 @@ private: }; // class FastMixer +// Represents the dump state of a fast track +struct FastTrackDump { + FastTrackDump() : mUnderruns(0) { } + /*virtual*/ ~FastTrackDump() { } + uint32_t mUnderruns; // Underrun status, represented as follows: + // bit 0 == 0 means not currently in underrun + // bit 0 == 1 means currently in underrun + // bits 1 to 31 == total number of underruns + // Not reset to zero for new tracks or if track generation changes. + // This representation is used to keep the information atomic. +}; + // 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. +// Each individual native word-sized field is accessed atomically. But the +// overall structure is non-atomic, that is there may be an inconsistency between fields. +// No barriers or locks are used for either writing or reading. +// Only POD types are permitted, and the contents shouldn't be trusted (i.e. do range checks). // It has a different lifetime than the FastMixer, and so it can't be a member of FastMixer. struct FastMixerDumpState { FastMixerDumpState(); @@ -60,6 +75,9 @@ struct FastMixerDumpState { uint32_t mOverruns; // total number of overruns uint32_t mSampleRate; size_t mFrameCount; + struct timespec mMeasuredWarmupTs; // measured warmup time + uint32_t mWarmupCycles; // number of loop cycles required to warmup + FastTrackDump mTracks[FastMixerState::kMaxFastTracks]; #ifdef FAST_MIXER_STATISTICS // cycle times in seconds float mMean; |