PPSSPP internals

Atrac3, Atrac3+ and other codecs
The PSP's (hidden) media engine processor handles decoding of formats like Atrac3+, Aac and so forth. This processor is not directly accessed by games, instead they go through libraries like sceAtrac,...
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MPEG / PSMF
The PSP supports playback of video encoded with a single video codec, AVC, or as it's more popularly known, H.264. I believe only "base profile" is supported (H.264 has a LOT of features).
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Rendering
Just various notes, and answered questions.
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Savestate backwards compatibility
PPSSPP uses a chunk-based savestate format, where each chunk has its own versioning.
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Scheduling
These are some notes written down by Nemoumbra in the chat (while he was looking at adding some tracing), later translated into this article.
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The PSP Media Engine and its implementation
The PSP has a separate CPU called the Media Engine. From a game's perspective, it's only accessible through high-level libraries.
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sceFont
Similar to the various upper level media decoders, sceFont is a user library that we can just load and run.
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