[gmpi] Revised Topic 7.2: In-place processing
- From: Tim Hockin <thockin@xxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx (GMPI Mailing list)
- Date: Fri, 6 Jun 2003 02:39:27 -0700 (PDT)
A new summary - please update it if you think anything is missing,
inaccurate, or mis-represented.
Topic 7.2: In-place processing
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Q: Do we do in-place processing?
a) Yes. A plugin-global flag indicates a plugins ability to do this.
This tells the host that ANY input buffer may be re-used on ANY output
(perhaps withing some higher-level grouping of stuff (think MIDI
channel?)). If a plug can not accept this rule, it must not use
in-place processing.
b) Yes. A plugin statically mnaps inputs to outputs. The host may
re-use an input buffer for an output if they map together.
c) Yes. A plugin is given inputs and produces it's own output buffers
based on internal knowledge or other variables. The host is not
involved, except to furnish new buffers as requested. The plugin must
re-use or release all input buffers. All inputs and outputs are
unique.
d) Yes. Option C, with the following change: buffers can be marked
read-only, in which case a plugin must copy the buffer. Input buffers
can be non-unique, so long as no more than one instance of the buffer
is writable (zero-filled buffer can be re-used, for example). Ouput
buffers are always unique.
e) Yes. Just like option D, but inputs and outputs may be non-unique.
Shared buffers must be read-only.
f) No. All buffers are unique, with the exception of host-provided
buffers, such as the zero-filled buffer.
g) Other. Explain.
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