[gmpi] Re: Decision time: 7.2

e.) A plugin is passed input and output buffers. The output buffers may be NULL, indicating that the corresponding input buffer should be processed in place. Hosts must not pass NULL output buffers if the plugin is assymetrical in its inputs and outputs. Hosts must not mix NULL and non-NULL output buffers in a single call.
Therefore, all symmetrical plugins must support in place and copy to processing. All assymetrical plugins only support copy-to processing. All buffer management is handled by the host.

Tim Hockin wrote:
Moving on! :)

Topic 7.2:  In-place processing
-------------------------------

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. (VST model?)

  b) Yes.  A plugin statically maps 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.  Variations on this can be devised
     to allowed shared input/outputs. (baton passing, or similar to DX model)

d) No. All output buffers are unique from input buffers.

e) Other. Explain.

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--
Mike Berry
Adobe Systems


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