Re: [LAD] "enhanced event port" LV2 extension proposal

I think the version you (probably) proposed is:

struct LV2_EVENT_HDR
{
  uint32_t frame, subframe;
  unsigned int size:24;
  unsigned int type:8;
  // put data here, but header size+data size must be a multiple of 8
};

plus 8-byte alignment requirement (ie. header size+payload size must be
an integer multiple of 8), is going to work.

Either that, or 16 bits for both size and type. Or 16 bits for size and
8 bits for type, and the remaining byte may be used for char field in
payload (5 byte payload "for free"). All three are more or less equally
good/bad.

MIDI would look like this: 12 bytes header, (up to) 3 bytes content, 1
byte padding - which is fine.

Same for pointer-only data on 32-bit architecture, for 64-bit, there
would be a padding of 4 bytes followed by 8-byte pointer. Not very
elegant, but perfectly acceptable. Plus, the compiler takes care of
generating padding.

Krzysztof

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Received on Sun Dec 2 16:15:02 2007