Re: Is this actually possible?

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

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?


-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de