> Le 9 oct. 2018 à 10:42, Oleg Nesterov <o...@redhat.com> a écrit :
>
> On 10/08, Julius Smith wrote:
>>
>> Very nice! Stéphane's solution is to add the needed state in a
>> subclass of dsp defined in the architecture file. See the attached
>> simple example ttfs = "test ffunction with state".
>
> Heh. Thanks, now I understand what you mean.
>
> This is very inconvenient and limited. And btw, this example doesn't look
> right.
>
> import("stdfaust.lib");
>
> ff_smooth = ffunction(float ff_smooth(float,float),"","");
> ff_init = ffunction(float ff_init(float),"","");
>
> smoothness0 = 0.5;
> smoothness1 = 0.9;
> smoother(smoothness) = ff_smooth(smoothness) : attach(ff_init(ma.SR));
> smoother0 = smoother(smoothness0);
> smoother1 = smoother(smoothness1);
>
> but this will not create 2 smoothers, class State has a single "float state"
> initialized twice in a row, and then
>
> process = 1-1' <: smoother0 , smoother1;
>
> ff_smooth() will be called twice too; the smoothness/x args are correct but
> again, both calls will play with the same "state".
>
> Well the example with 2 states was actually this code, with explicit 2 State1 and State2 classes…etc..
ffs_steph1.tgz
Description: Binary data
> I modified tffs.dsp:
>
> smoother = FPP(smoothness, x) {
> // shared by all instances, this is only needed to create the
> // unique "$smoother" id printed below.
> DECL: int smoothers;
> INIT: smoothers = 0;
>
> // every instance has its own state/smother
> decl: int $smoother;
> float $state;
>
> init: $state = 0;
> $smoother = smoothers++;
>
> std::cout << "created smoother " << $smoother << std::endl;
>
> exec:
> $state = (1.0f - $smoothness) * $x + $smoothness * $state;
> std::cout << "smoother " << $smoother << ": " << $smoothness <<
> ", x: " << $x << ", y: " << $state << std::endl;
> $state;
> };
>
> smoothness0 = 0.5;
> smoothness1 = 0.9;
> smoother0 = smoother(smoothness0);
> smoother1 = smoother(smoothness1);
>
> process = 1-1' <: smoother0 , smoother1;
>
> then changed Makefile to run fpp instead of faust, and the output is
>
> created smoother 0
> created smoother 1
> smoother 0: 0.5, x: 1, y: 0.5
> smoother 1: 0.9, x: 1, y: 0.1
> smoother 0: 0.5, x: 0, y: 0.25
> smoother 1: 0.9, x: 0, y: 0.09
> smoother 0: 0.5, x: 0, y: 0.125
> smoother 1: 0.9, x: 0, y: 0.081
> smoother 0: 0.5, x: 0, y: 0.0625
> smoother 1: 0.9, x: 0, y: 0.0729
> smoother 0: 0.5, x: 0, y: 0.03125
> smoother 1: 0.9, x: 0, y: 0.06561
> smoother 0: 0.5, x: 0, y: 0.015625
> smoother 1: 0.9, x: 0, y: 0.059049
> smoother 0: 0.5, x: 0, y: 0.0078125
> smoother 1: 0.9, x: 0, y: 0.0531441
> smoother 0: 0.5, x: 0, y: 0.00390625
> smoother 1: 0.9, x: 0, y: 0.0478297
>
> which looks correct.
>
> process = 1-1' <: par(i, 10, smoother((i+1)/10));
>
> outputs
>
> created smoother 0
> created smoother 1
> created smoother 2
> created smoother 3
> created smoother 4
> created smoother 5
> created smoother 6
> created smoother 7
> created smoother 8
> created smoother 9
> smoother 0: 0.1, x: 1, y: 0.9
> smoother 1: 0.2, x: 1, y: 0.8
> smoother 2: 0.3, x: 1, y: 0.7
> smoother 3: 0.4, x: 1, y: 0.6
> smoother 4: 0.5, x: 1, y: 0.5
> smoother 5: 0.6, x: 1, y: 0.4
> smoother 6: 0.7, x: 1, y: 0.3
> smoother 7: 0.8, x: 1, y: 0.2
> smoother 8: 0.9, x: 1, y: 0.1
> smoother 9: 1, x: 1, y: 0
> ...
>
> No need to create a subclass, no need to write the additional C++ code, etc.
>
> Oleg.
>
Julius initial demand was more limited, and the proposed solution was enough I
think.
OK your solution seems more general, so we are interested to see your FPP code
((-;
Stéphane
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