Merge "AudioService: reduce EU volume warning thresdhold for USB headsets" into oc-mr1-dev

    private int mSafeMediaVolumeIndex;

    // mSafeUsbMediaVolumeIndex is used for USB Headsets and is the music volume UI index

    // corresponding to a gain of -30 dBFS in audio flinger mixer.

    // We remove -15 dBs from the theoretical -15dB to account for the EQ boost when bands are set

    // to max gain.

    // We remove -22 dBs from the theoretical -15dB to account for the EQ + bass boost

    // amplification when both effects are on with all band gains at maximum.

    // This level corresponds to a loudness of 85 dB SPL for the warning to be displayed when

    // the headset is compliant to EN 60950 with a max loudness of 100dB SPL.

    private int mSafeUsbMediaVolumeIndex;

    private static final float SAFE_VOLUME_GAIN_DBFS = -30.0f;

    private static final float SAFE_VOLUME_GAIN_DBFS = -37.0f;

    // mSafeMediaVolumeDevices lists the devices for which safe media volume is enforced,

    private final int mSafeMediaVolumeDevices = AudioSystem.DEVICE_OUT_WIRED_HEADSET |

                                                AudioSystem.DEVICE_OUT_WIRED_HEADPHONE |