AACplus/HE-AAC playback on Ipod 5G Video

[saratoga]

Actually, according to the official numbers a 67mhz ARM core can play back certain bitrates of HE-AAC, though it was ARM9 I believe, and doesn't specify if that's running only the decoder or if that's the minimum expected to be needed in a device.

As once we're running dual core we might have a single 80mhz ARM7 core sitting around for decoding, it might be possible for some bitrates of HE-AAC to be realtime on iPod, though by no means is this any guarantee or promise until both testing and optimization have been done. They'll of course be lower bitrates, but once you reach 128kbps or so, there's much much less advantage to these types of formats anyway.

IIRC that was Real's decoder, but they simulated with 0 latency memory (basically enough IRAM to run the entire codec), not a real system.  The Nero people thought their results were pretty ridiculous, but who knows.  

I'd like to see the AAC decoder worked on.  I think it could be a lot faster.  Though getting AAC-HE working @ 80MHz would be really tough, and maybe not even possible.

[Llorean]

If it's not possible, it's not possible, and that's life.
I'd honestly like to see the MP3 decoder worked on (or if there's not much room to improve it on ARM, then improve the Vorbis one on Coldfire, because the performance levels are so different between those two on the two architectures.)

But that's my preference.