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Commit 28ed2f93 authored by Glenn Kasten's avatar Glenn Kasten
Browse files

Reduce underruns in screen off, esp. with EQ 

Add MonoPipe APIs to specify setpoint.
Use screen state to configure pipe setpoint.
Fix a long-standing bug where pipe sleep time was excessive,
  which interacted poorly with governor and low clock frequencies.
  Now it deducts the elapsed time since last write(),
  which was significant when there was EQ and low clock frequency.

Bug: 6618373
Change-Id: I6f3b0072c2244aeb033ef0795ad164491a164ff5
parent a4f7e0e9

include/media/AudioParameter.h

+2 −0
Original line number Diff line number Diff line
@@ -40,12 +40,14 @@ public: 
    //  keyFrameCount: to change audio output frame count, value is an int

    //  keyInputSource: to change audio input source, value is an int in audio_source_t

    //     (defined in media/mediarecorder.h)

    //  keyScreenState: either "on" or "off"

    static const char * const keyRouting;

    static const char * const keySamplingRate;

    static const char * const keyFormat;

    static const char * const keyChannels;

    static const char * const keyFrameCount;

    static const char * const keyInputSource;

    static const char * const keyScreenState;



    String8 toString();

media/libmedia/AudioParameter.cpp

+1 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ const char * const AudioParameter::keyFormat = AUDIO_PARAMETER_STREAM_FORMAT; 
const char * const AudioParameter::keyChannels = AUDIO_PARAMETER_STREAM_CHANNELS;

const char * const AudioParameter::keyFrameCount = AUDIO_PARAMETER_STREAM_FRAME_COUNT;

const char * const AudioParameter::keyInputSource = AUDIO_PARAMETER_STREAM_INPUT_SOURCE;

const char * const AudioParameter::keyScreenState = AUDIO_PARAMETER_KEY_SCREEN_STATE;



AudioParameter::AudioParameter(const String8& keyValuePairs)

{

services/audioflinger/Android.mk

+3 −0
Original line number Diff line number Diff line
@@ -30,6 +30,9 @@ LOCAL_SRC_FILES := \ 
#LOCAL_C_INCLUDES += path/to/libsndfile/src

#LOCAL_STATIC_LIBRARIES += libsndfile



# uncomment for systrace

# LOCAL_CFLAGS += -DATRACE_TAG=ATRACE_TAG_AUDIO



LOCAL_MODULE := libnbaio



include $(BUILD_STATIC_LIBRARY)

services/audioflinger/AudioFlinger.cpp

+23 −0
Original line number Diff line number Diff line
@@ -164,6 +164,9 @@ static const enum { 
    //  up large writes into smaller ones, and the wrapper would need to deal with scheduler.

} kUseFastMixer = FastMixer_Static;



static uint32_t gScreenState; // incremented by 2 when screen state changes, bit 0 == 1 means "off"

                              // AudioFlinger::setParameters() updates, other threads read w/o lock



// ----------------------------------------------------------------------------



#ifdef ADD_BATTERY_DATA
@@ -889,6 +892,13 @@ status_t AudioFlinger::setParameters(audio_io_handle_t ioHandle, const String8& 
                mBtNrecIsOff = btNrecIsOff;

            }

        }

        String8 screenState;

        if (param.get(String8(AudioParameter::keyScreenState), screenState) == NO_ERROR) {

            bool isOff = screenState == "off";

            if (isOff != (gScreenState & 1)) {

                gScreenState = ((gScreenState & ~1) + 2) | isOff;

            }

        }

        return final_result;

    }
@@ -1501,6 +1511,7 @@ AudioFlinger::PlaybackThread::PlaybackThread(const sp<AudioFlinger>& audioFlinge 
        mMixerStatus(MIXER_IDLE),

        mMixerStatusIgnoringFastTracks(MIXER_IDLE),

        standbyDelay(AudioFlinger::mStandbyTimeInNsecs),

        mScreenState(gScreenState),

        // index 0 is reserved for normal mixer's submix

        mFastTrackAvailMask(((1 << FastMixerState::kMaxFastTracks) - 1) & ~1)

{
@@ -2224,6 +2235,8 @@ AudioFlinger::MixerThread::MixerThread(const sp<AudioFlinger>& audioFlinger, Aud 
        size_t numCounterOffers = 0;

        ssize_t index = monoPipe->negotiate(offers, 1, NULL, numCounterOffers);

        ALOG_ASSERT(index == 0);

        monoPipe->setAvgFrames((mScreenState & 1) ?

                (monoPipe->maxFrames() * 7) / 8 : mNormalFrameCount * 2);

        mPipeSink = monoPipe;



#ifdef TEE_SINK_FRAMES
@@ -2686,6 +2699,16 @@ void AudioFlinger::PlaybackThread::threadLoop_write() 
#if defined(ATRACE_TAG) && (ATRACE_TAG != ATRACE_TAG_NEVER)

        Tracer::traceBegin(ATRACE_TAG, "write");

#endif

        // update the setpoint when gScreenState changes

        uint32_t screenState = gScreenState;

        if (screenState != mScreenState) {

            mScreenState = screenState;

            MonoPipe *pipe = (MonoPipe *)mPipeSink.get();

            if (pipe != NULL) {

                pipe->setAvgFrames((mScreenState & 1) ?

                        (pipe->maxFrames() * 7) / 8 : mNormalFrameCount * 2);

            }

        }

        ssize_t framesWritten = mNormalSink->write(mMixBuffer, count);

#if defined(ATRACE_TAG) && (ATRACE_TAG != ATRACE_TAG_NEVER)

        Tracer::traceEnd(ATRACE_TAG);

services/audioflinger/AudioFlinger.h

+1 −0
Original line number Diff line number Diff line
@@ -1119,6 +1119,7 @@ public: 
        // For dumpsys

        sp<NBAIO_Sink>          mTeeSink;

        sp<NBAIO_Source>        mTeeSource;

        uint32_t                mScreenState;   // cached copy of gScreenState

    public:

        virtual     bool        hasFastMixer() const = 0;

        virtual     FastTrackUnderruns getFastTrackUnderruns(size_t fastIndex) const