[gmpi] Re: Topic 3: Cross platform
- From: Tim Hockin <thockin@xxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Wed, 5 Mar 2003 17:31:04 -0800 (PST)
> I am somewhat worried about the audio format negotiations. One of the
> strengths of VST is that there is no audio format negotiation. And if I
> were to choose a single audio format, it would be 32 bit floats, ruling
> out non-fp platforms.
> I think, however, that I would prefer that we separate the plugins by a
> data format indicator. So the host queries for the supported data
> formats of the plugin (32 bit float, 32 bit int, 16 bit int, 64 bit
> float) and then chooses to load the plugin or not. The host then calls
> SetAudioFormat() on the plugin, stating that for this instance of the
> plugin the format will always be X, where X is one of the supported
> foramts that the plugin reported. And then calls the appropriate Process
> calls.
I have been contemplating something a BIT more flexible, but not awful at
all. Each audio port identifes the I/O it supports. A very short list:
8.24 fixed point int (maybe)
16 bit int (maybe)
24 bit int (maybe)
32 bit float (definitely)
64 bit float (definitely)
The host chooses at connection time which format a connection has. The
plugin knows that as long as that buffer is connected, it's type is
constant.
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