Allow changing processing interval in SoundStream

[vfjpl]

Thanks a lot for making a contribution to SFML! 🙂

Before you create the pull request, we ask you to check the follow boxes. (For small changes not everything needs to ticked, but the more the better!)

• Has this change been discussed on the forum or in an issue before?
• Does the code follow the SFML Code Style Guide?
• Have you provided some example/test code for your changes?
• If you have additional steps which need to be performed list them as tasks!

---

Description

This patch bring similar functionality that is available in SoundRecorder. It is useful to be able to change it when you have your own waiting/blocking calls in onGetData function. That way sleep in SoundRecorder don't get in your way. After this patch default behaviour is the same.

Tasks

• Tested on Linux
• Tested on Windows
• Tested on macOS
• Tested on iOS
• Tested on Android

How to test this PR?

Describe how to best test these changes. Please provide a minimal, complete and verifiable example if possible, you can use the follow template as a start:

#include <SFML/Audio/SoundStream.hpp>
class FastSoundStreamt: public sf::SoundStream
{
    FastSoundStream()
    {
         sf::SoundRecorder::setProcessingInterval(sf::Time::Zero);
    }
    void onSeek(sf::Time timeOffset) {}
    bool onGetData(sf::SoundStream::Chunk& data)
    {
        //custom blocking calls for samples
    }
};

[LaurentGomila]

You should rather talk about getData, fillAndPushBuffer means nothing for the user.

[eXpl0it3r]

Did you intentionally close this PR?

[vfjpl]

Yes, to think about it more when I will have more time. Do you have any suggestions about this PR? :)