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Newsgroups: comp.lang.ada
Date: Fri, 13 Dec 2019 03:11:37 -0800 (PST)
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Subject: Re: Is this actually possible?
From: Lucretia <laguest9000@googlemail.com>
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Xref: reader01.eternal-september.org comp.lang.ada:57725
Date: 2019-12-13T03:11:37-08:00
List-Id: <comp.lang.ada>

On Thursday, 12 December 2019 21:12:34 UTC, Dmitry A. Kazakov  wrote:
> On 2019-12-12 21:54, Lucretia wrote:
> > On Thursday, 12 December 2019 19:09:25 UTC, Dmitry A. Kazakov  wrote:
> >> On 2019-12-12 19:30, Lucretia wrote:
> >>> On Thursday, 12 December 2019 18:24:55 UTC, Dmitry A. Kazakov  wrote:
> >>>> On 2019-12-12 16:15, Lucretia wrote:
> >>>>> On Thursday, 12 December 2019 15:14:33 UTC, Lucretia  wrote:
> >>>>>
> >>>>>
> >>>>>>>>> Why? You must know all variants in order to compute the array element
> >>>>>>>>> size. In Ada you cannot have it either:
> >>>>>>>>
> >>>>>>>> Because it's a binding to a C record: https://github.com/Lucretia/aplug/blob/master/ladspa/src/ladspa.ads#L113
> >>>>>>>
> >>>>>>> I cannot recognize problem there.
> >>>>>>
> >>>>>> That's a predefined struct, it's referenced in the Descriptors below it. It cannot be changed. The API is too cyclic AFAIK to make generics out of it all.
> >>>>>
> >>>>> At the programmer's level, i.e. building a plug-in using the LADSPA API, they define ranges for their ports using that record above. Each port can have different ranges.
> >>>>
> >>>> Can you post the C struct type and where it is used.
> >>>
> >>> In ladspa.h and in exactly the same place as the Ada.
> >>>
> >>> https://www.ladspa.org/ladspa_sdk/ladspa.h.txt
> >>>
> >>> Here is the struct on a gh mirror: https://github.com/adsr/ladspa-sdk/blob/master/src/ladspa.h#L337
> >>>
> >>> and it is used here: https://github.com/adsr/ladspa-sdk/blob/master/src/ladspa.h#L419
> >>
> >> Maybe I am dense, but what I see is this:
> >>
> >>      typedef struct _LADSPA_PortRangeHint {
> >>
> >>        /* Hints about the port. */
> >>        LADSPA_PortRangeHintDescriptor HintDescriptor;
> >>
> >>        /* Meaningful when hint LADSPA_HINT_BOUNDED_BELOW is active. When
> >>           LADSPA_HINT_SAMPLE_RATE is also active then this value should be
> >>           multiplied by the relevant sample rate. */
> >>        LADSPA_Data LowerBound;
> >>
> >>        /* Meaningful when hint LADSPA_HINT_BOUNDED_ABOVE is active. When
> >>           LADSPA_HINT_SAMPLE_RATE is also active then this value should be
> >>           multiplied by the relevant sample rate. */
> >>        LADSPA_Data UpperBound;
> >>
> >>      } LADSPA_PortRangeHint;
> >>
> >> and
> >>
> >>      typedef int LADSPA_PortRangeHintDescriptor;
> >>      typedef float LADSPA_Data;
> >>
> >> Where is a problem?
> > 
> > You didn;'t look at both links I posted.
> 
> That was from the linked header file. Could you simply post C code of 
> what you mean?

I already did.