so the screenshots I'm posting are my lock screen when using, in order: Rocket Player Beta, 7Digital (music store app with built-in player), Beyond Pod (podcaster), PowerApm and the built-in CyanogenMod music player. My educated guess is that 7Digital, BeyondPod & the CM app all use the build-in generic Android player, whereas Rocker Player & PowerAmp use proprietary audio engines. You'll see that all except Rocket Player seem to somehow allow the ROM to fetch & display the album art & audio frequencies for the lockscreen. So again, I'm not a dev so I have no idea how it's done, but given that these features are activated with a range of audio players I am guessing they call on some generic features of Android or at least CM (my ROM is CM-based). Hope this helps!
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