Update duplicating thread to use float audio

        }

    }

    if (mType == DUPLICATING && mMixerBufferEnabled && mEffectBufferEnabled) {

        // For best precision, we use float instead of the associated output

        // device format (typically PCM 16 bit).

        mFormat = AUDIO_FORMAT_PCM_FLOAT;

        mFrameSize = mChannelCount * audio_bytes_per_sample(mFormat);

        mBufferSize = mFrameSize * mFrameCount;

        // TODO: We currently use the associated output device channel mask and sample rate.

        // (1) Perhaps use the ORed channel mask of all downstream MixerThreads

        // (if a valid mask) to avoid premature downmix.

        // (2) Perhaps use the maximum sample rate of all downstream MixerThreads

        // instead of the output device sample rate to avoid loss of high frequency information.

        // This may need to be updated as MixerThread/OutputTracks are added and not here.

    }

    // Calculate size of normal sink buffer relative to the HAL output buffer size

    double multiplier = 1.0;

    if (mType == MIXER && (kUseFastMixer == FastMixer_Static ||

            mNormalFrameCount);

    mAudioMixer = new AudioMixer(mNormalFrameCount, mSampleRate);

    if (type == DUPLICATING) {

        // The Duplicating thread uses the AudioMixer and delivers data to OutputTracks

        // (downstream MixerThreads) in DuplicatingThread::threadLoop_write().

        // Do not create or use mFastMixer, mOutputSink, mPipeSink, or mNormalSink.

        return;

    }

    // create an NBAIO sink for the HAL output stream, and negotiate

    mOutputSink = new AudioStreamOutSink(output->stream);

    size_t numCounterOffers = 0;