iOS podcast app that differentiates between and gives different functionality to long/short presses of the play/pause button on the headphones
Those are system wide commands, not exclusive to your app:

Fast forward
To speed up your track simply tap the Play/Pause button rapidly twice and hold the control down after the second tap -- the track will skip forward.
Rewind
Similarly, to rewind a song tap the Play/Pause button three times and hold the control down for the track to skip back.
Skip to next track
Bored of the song that's playing? Just tap the Play/Pause button twice to skip to the beginning of the next track.
Skip to previous track
You can also skip to a previous track -- all you need to do is tap the Play/Pause button three times.

http://www.computerworld.com/article/2476507/apple-ios/ios--how-to-use-iphone--ipad-earphones-in-13-tips.html
Some of them even work on your Mac.
The Apple Podcasts app has the same functionality.