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Commit 9cbf9ff8 authored by Eric Laurent's avatar Eric Laurent Committed by Automerger Merge Worker
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Merge "AudioFlinger: synchronize OutputTracks start on duplicating threads"... 

Merge "AudioFlinger: synchronize OutputTracks start on duplicating threads" into udc-dev am: 4ac986d8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/22749304



Change-Id: Ibfea6da47aa17c33b7613597320731a8bc607ef3
Signed-off-by: default avatarAutomerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
parents fae8f9c5 4ac986d8

services/audioflinger/PlaybackTracks.h

+1 −0
Original line number Diff line number Diff line
@@ -426,6 +426,7 @@ public: 
private:

    status_t            obtainBuffer(AudioBufferProvider::Buffer* buffer,

                                     uint32_t waitTimeMs);

    void                queueBuffer(Buffer& inBuffer);

    void                clearBufferQueue();



    void                restartIfDisabled();

services/audioflinger/Threads.cpp

+12 −4
Original line number Diff line number Diff line
@@ -4023,7 +4023,7 @@ NO_THREAD_SAFETY_ANALYSIS // manual locking of AudioFlinger 
                        LOG_AUDIO_STATE();

                        mThreadMetrics.logEndInterval();

                        mThreadSnapshot.onEnd();

                        mStandby = true;

                        setStandby_l();

                    }

                    sendStatistics(false /* force */);

                }
@@ -4103,6 +4103,14 @@ NO_THREAD_SAFETY_ANALYSIS // manual locking of AudioFlinger 
            activeTracks.insert(activeTracks.end(), mActiveTracks.begin(), mActiveTracks.end());



            setHalLatencyMode_l();



            // signal actual start of output stream when the render position reported by the kernel

            // starts moving.

            if (!mStandby && !mHalStarted && mKernelPositionOnStandby !=

                    mTimestamp.mPosition[ExtendedTimestamp::LOCATION_KERNEL]) {

                mHalStarted = true;

                mWaitHalStartCV.broadcast();

            }

        } // mLock scope ends



        if (mBytesRemaining == 0) {
@@ -4488,7 +4496,7 @@ NO_THREAD_SAFETY_ANALYSIS // manual locking of AudioFlinger 


    if (!mStandby) {

        threadLoop_standby();

        mStandby = true;

        setStandby();

    }



    releaseWakeLock();
@@ -6239,7 +6247,7 @@ bool AudioFlinger::MixerThread::checkForNewParameter_l(const String8& keyValuePa 
            if (!mStandby) {

                mThreadMetrics.logEndInterval();

                mThreadSnapshot.onEnd();

                mStandby = true;

                setStandby_l();

            }

            mBytesWritten = 0;

            status = mOutput->stream->setParameters(keyValuePair);
@@ -6890,7 +6898,7 @@ bool AudioFlinger::DirectOutputThread::checkForNewParameter_l(const String8& key 
            if (!mStandby) {

                mThreadMetrics.logEndInterval();

                mThreadSnapshot.onEnd();

                mStandby = true;

                setStandby_l();

            }

            mBytesWritten = 0;

            status = mOutput->stream->setParameters(keyValuePair);

services/audioflinger/Threads.h

+34 −0
Original line number Diff line number Diff line
@@ -1116,6 +1116,32 @@ public: 
                void startMelComputation_l(const sp<audio_utils::MelProcessor>& processor) override;

                void stopMelComputation_l() override;



                void setStandby() {

                    Mutex::Autolock _l(mLock);

                    setStandby_l();

                }



                void setStandby_l() {

                    mStandby = true;

                    mHalStarted = false;

                    mKernelPositionOnStandby =

                        mTimestamp.mPosition[ExtendedTimestamp::LOCATION_KERNEL];

                }



                bool waitForHalStart() {

                    Mutex::Autolock _l(mLock);

                    static const nsecs_t kWaitHalTimeoutNs = seconds(2);

                    nsecs_t endWaitTimetNs = systemTime() + kWaitHalTimeoutNs;

                    while (!mHalStarted) {

                        nsecs_t timeNs = systemTime();

                        if (timeNs >= endWaitTimetNs) {

                            break;

                        }

                        nsecs_t waitTimeLeftNs = endWaitTimetNs - timeNs;

                        mWaitHalStartCV.waitRelative(mLock, waitTimeLeftNs);

                    }

                    return mHalStarted;

                }

protected:

    // updated by readOutputParameters_l()

    size_t                          mNormalFrameCount;  // normal mixer and effects
@@ -1415,6 +1441,14 @@ private: 
    // Downstream patch latency, available if mDownstreamLatencyStatMs.getN() > 0.

    audio_utils::Statistics<double> mDownstreamLatencyStatMs{0.999};



    // output stream start detection based on render position returned by the kernel

    // condition signalled when the output stream has started

    Condition                mWaitHalStartCV;

    // true when the output stream render position has moved, reset to false in standby

    bool                     mHalStarted = false;

    // last kernel render position saved when entering standby

    int64_t                  mKernelPositionOnStandby = 0;



public:

    virtual     bool        hasFastMixer() const = 0;

    virtual     FastTrackUnderruns getFastTrackUnderruns(size_t fastIndex __unused) const

services/audioflinger/Tracks.cpp

+63 −25
Original line number Diff line number Diff line
@@ -2056,17 +2056,50 @@ void AudioFlinger::PlaybackThread::OutputTrack::stop() 


ssize_t AudioFlinger::PlaybackThread::OutputTrack::write(void* data, uint32_t frames)

{

    Buffer *pInBuffer;

    Buffer inBuffer;

    inBuffer.frameCount = frames;

    inBuffer.raw = data;

    if (!mActive && frames != 0) {

        sp<ThreadBase> thread = mThread.promote();

        if (thread != nullptr && thread->standby()) {

            // preload one silent buffer to trigger mixer on start()

            ClientProxy::Buffer buf { .mFrameCount = mClientProxy->getStartThresholdInFrames() };

            status_t status = mClientProxy->obtainBuffer(&buf);

            if (status != NO_ERROR && status != NOT_ENOUGH_DATA && status != WOULD_BLOCK) {

                ALOGE("%s(%d): could not obtain buffer on start", __func__, mId);

                return 0;

            }

            memset(buf.mRaw, 0, buf.mFrameCount * mFrameSize);

            mClientProxy->releaseBuffer(&buf);



    uint32_t waitTimeLeftMs = mSourceThread->waitTimeMs();

            (void) start();



    if (!mActive && frames != 0) {

            // wait for HAL stream to start before sending actual audio. Doing this on each

            // OutputTrack makes that playback start on all output streams is synchronized.

            // If another OutputTrack has already started it can underrun but this is OK

            // as only silence has been played so far and the retry count is very high on

            // OutputTrack.

            auto pt = static_cast<PlaybackThread *>(thread.get());

            if (!pt->waitForHalStart()) {

                ALOGW("%s(%d): timeout waiting for thread to exit standby", __func__, mId);

                stop();

                return 0;

            }



            // enqueue the first buffer and exit so that other OutputTracks will also start before

            // write() is called again and this buffer actually consumed.

            Buffer firstBuffer;

            firstBuffer.frameCount = frames;

            firstBuffer.raw = data;

            queueBuffer(firstBuffer);

            return frames;

        } else {

            (void) start();

        }

    }



    Buffer *pInBuffer;

    Buffer inBuffer;

    inBuffer.frameCount = frames;

    inBuffer.raw = data;

    uint32_t waitTimeLeftMs = mSourceThread->waitTimeMs();

    while (waitTimeLeftMs) {

        // First write pending buffers, then new data

        if (mBufferQueue.size()) {
@@ -2134,8 +2167,23 @@ ssize_t AudioFlinger::PlaybackThread::OutputTrack::write(void* data, uint32_t fr 
    if (inBuffer.frameCount) {

        sp<ThreadBase> thread = mThread.promote();

        if (thread != 0 && !thread->standby()) {

            queueBuffer(inBuffer);

        }

    }



    // Calling write() with a 0 length buffer means that no more data will be written:

    // We rely on stop() to set the appropriate flags to allow the remaining frames to play out.

    if (frames == 0 && mBufferQueue.size() == 0 && mActive) {

        stop();

    }



    return frames - inBuffer.frameCount;  // number of frames consumed.

}



void AudioFlinger::PlaybackThread::OutputTrack::queueBuffer(Buffer& inBuffer) {



    if (mBufferQueue.size() < kMaxOverFlowBuffers) {

                pInBuffer = new Buffer;

        Buffer *pInBuffer = new Buffer;

        const size_t bufferSize = inBuffer.frameCount * mFrameSize;

        pInBuffer->mBuffer = malloc(bufferSize);

        LOG_ALWAYS_FATAL_IF(pInBuffer->mBuffer == nullptr,
@@ -2154,16 +2202,6 @@ ssize_t AudioFlinger::PlaybackThread::OutputTrack::write(void* data, uint32_t fr 
        // TODO: return error for this.

    }

}

    }



    // Calling write() with a 0 length buffer means that no more data will be written:

    // We rely on stop() to set the appropriate flags to allow the remaining frames to play out.

    if (frames == 0 && mBufferQueue.size() == 0 && mActive) {

        stop();

    }



    return frames - inBuffer.frameCount;  // number of frames consumed.

}



void AudioFlinger::PlaybackThread::OutputTrack::copyMetadataTo(MetadataInserter& backInserter) const

{