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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: Allocation questions
Newsgroups: comp.lang.ada
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Organization: cbb software GmbH
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Date: Thu, 28 May 2009 12:05:39 +0200
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Date: 2009-05-28T12:05:39+02:00
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On Thu, 28 May 2009 11:46:51 +0200, in comp.lang.ada you wrote:

> In the context of my small audio project, I need to create an object to 
> introduce a delay in a signal. With some of these objects and other 
> stuff it is possible to simulate nice reverberation.
> 
> Here is the code (As delay is a reserved word in Ada, I use Delay_T as I 
> found nothing better !):
> 
> package audio.effect is
> 
>      type Sample is new Float;
>      type Time   is new Float;
> 
>      type Samples_Array is array (Positive range <>) of Sample;
> 
>      type Delay_T is tagged record
>          Delay_Time: Time;
>          Output    : Sample;
>          Samples   : access Samples_Array;
>      end record;

     type Delay_T (Size : Natural) is tagged record
         Delay_Time: Time;
         Output    : Sample;
         Samples   : Samples_Array (1..Size);
     end record;

(A side note, I suppose that Delay_Time is not of Time but of Duration.)

>      function Create_Delay (Time_Value: Time) return Delay_T;
> 
>      procedure Input (D: Delay_T; Input: Sample);
>      function Output (D: Delay_T) return Sample;
>      procedure  Next (D: Delay_T); -- compute next output
> 
> end audio.effect;
> 
> package body audio.effect is
> 
>      function Create_Delay(Time_Value: Time) return Delay_T is
>          Result:      Delay_T;
>          Nb_Samples:  Integer;
>      begin
>          Result.Delay_Time := Time_Value;
>          Nb_Samples := Integer(Time_Value * 44_100.0);
>          Result.Samples := new Samples_Array(1..Nb_Samples);
>          Result.Output  := 0.0;
>          return Result;
>      end Create_Delay;

     function Create_Delay(Time_Value: Time) return Delay_T is
        Result : Delay_T (Natural (Time_Value * 44_100.0));
     begin
        Result.Delay_Time := Time_Value;
        Result.Output  := 0.0;
        return Result;
     end Create_Delay;

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