I'm creating a project where music gets played that is the same length or slightly shorter than the given time (minutes:seconds). For this I have a Sparkfun MP3 shield, which also has a microSD slot.
The issue is that I can't find a way to get the playtime of a given MP3 file. The only idea that I have is using the filesize and bitrate, but that would be horribly annoying for multiple bitrates.
Thanks in advance,