Merge "Fix race while setting ASyncNotify callback" into tm-qpr-dev am: a9c774f6

        AMediaCodecOnAsyncNotifyCallback callback,

        void *userdata) {

    {

        Mutex::Autolock _l(mData->mAsyncCallbackLock);

        if (mData->mAsyncNotify == NULL) {

            mData->mAsyncNotify = new AMessage(kWhatAsyncNotify, mData->mHandler);

        }

        // we set this ahead so that we can be ready

        // to receive callbacks as soon as the next call is a

        // success.

        mData->mAsyncCallback = callback;

        mData->mAsyncCallbackUserData = userdata;

    }

    // always call, codec may have been reset/re-configured since last call.

    status_t err = mData->mCodec->setCallback(mData->mAsyncNotify);

    if (err != OK) {

        {

            //The setup gone wrong. clean up the pointers.

            Mutex::Autolock _l(mData->mAsyncCallbackLock);

            mData->mAsyncCallback = {};

            mData->mAsyncCallbackUserData = nullptr;

        }

        ALOGE("setAsyncNotifyCallback: err(%d), failed to set async callback", err);

        return translate_error(err);

    }

    mData->mAsyncCallback = callback;

    mData->mAsyncCallbackUserData = userdata;

    return AMEDIA_OK;

}