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Should be quite easy if you want to support one of any particular algorithm, let say RC-5. Search Internet - there are many open-source projects like this.
But universal IR is quite tricky thing. Then, I would suggest to recognize and analyze 3 basic encoding methods: Pulse, Shift and Space and store decoded info.
Also, you can try to save IR signal as sampled state of integrated IR receiver every 10 us. AVR' internal data RAM should be enough to keep couple of packets in such representation.
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