How to measure sound decibel in Android?

Since Android device can play music using in-built music player or using external apps such as YouTube or TuneIn Radio, I wonder if it is possible to "**measure**" the sound being played by Android through earphones/headsets? **For example**: I am using Google Music App to play music through headset/earphone. ***Is there a way(any tool or app)to know how much sound in decibel it is generating?*** Already checked Sound Meter , but it seems to be monitoring only the external sound/noice around phone , not really catching the sound output from earphone. As discussed in this Health.SE post , there seems to be health implications (related to hearing loss etc.) if one hears the music at higher decibel volume. Hence, its better to check what sound level you are hearing your music at for safer media experience.