How do apps that slow down music from spotify work? - sdk

If im familiar you can't just download music from spotify using spotify SDK or API and also you can't modify the track (like slow down the track) in Spotify SDK Web Player. How come apps like Amazing Slow Downer work?
I tried to find anything on how to access data from spotify and i'm pretty sure that you can't access it. I'm also sure that it's not possible to modify tracks using Spotify API.

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What framework to use play videos like in applications like YouTube and Instagram IOS

I'm trying to build a social media app where you can play upload videos to a database
And then can be streamed and played like you can on YouTube and Instagram
my question is in applications like YouTube and Instagram
what frameworks are used if anyone knows this for example is it AV foundation or any other frameworks or techniques that I'm not aware off
apologies if this is not the right place to ask this question but I'm very new to iOS and Swift and finding a hard time to get information from other people.
I know how to use AV foundation but just wanted to know was this still the correct way to do it

Migration to new Spotify SDK

Our IOS application uses Spotify SDK for audio streaming, but we have been warned that it will stop working soon. Could someone to help us with the following questions:
Can we use new Spotify SDK without installing a Spotify application?(https://github.com/spotify/ios-sdk/blob/master/README.md)
Has Spotify any private / paid SDKs that we could use to increase the functionality of our application?
Spotify backend uses DRM encoding technology when streaming audio. In order to use a different player (not from SDK) or can we do without it?
Is it possible to play Spotify stream with another player? If so, which one?
Is it possible to formally redirect Spotify stream through our backend?

How do YouTube downloaders access the videos?

I did find this answer but it uses YouTube's APIv2, and is now outdated as stated in the answer.
YouTube's terms of use state that you can't use another player or download videos, so it makes sense they've excluded it from the API.
Knowing that, how do online YouTube downloaders, or third party Android apps (that allow to turn the screen off while they keep playing music for example) access those videos?
I'm trying to access a video to stream it inside unity for example (by the way there's a couple of unity assets that do it too), and I'd like to learn how they do it.

How To Push Music Playable Data Streamed From Spotify To A Device That Does Not Use The SDK Provided By Spotify

I apologise for the possibility of the title of my question would lead to confusion of the problem. For that I will explain my purpose in detail.
We are currently developing our own wifi speaker which is built with MIPS. The speaker comes with an app that will be used to manage it. One of the features that would we would like to include in the app is accessing contents of Spotify and be able to play them on the speakers.
Unfortunately, after going through the iOS SDK Documentation, and did some tests on Web API Console provided by the official of Spotify, I noticed that Spotify does not allow developers to directly get URL of a song, except for preview purposes. I also wasn't able to find any way to get the data bytes of the music streamed from the server. Every content comes with a corresponding URI which is used for a request.
For the device(WiFi Speaker) part, we recently tried to contact Spotify and ask for an SDK that can be used for development. However, one problem is that Spotify told us that they have SDK for x86, and ARMs architecture only. They don't have MIPS.
Now, here are my questions:
Is there any way for me to push music from an app to the WiFi Speakers without having to use SDK (for backend device)?
If Spotify can provide an SDK for our device, then how can we integrate the SDK with our platform?
I'll explain my 2nd question for clarity. Like for instance, in Android and iOS, these are popular platforms and are widely used by mobile devices. So if they provide SDKs for the two OS, then they can use default system frameworks to access the player for playing the content. (In iOS, it's the AVFoundation Framework). However, if Spotify were able to provide the SDK that we need, how would we able to integrate that with our own platform?
I will answer your question no 1:
You should be able to push music from an app using a buffer that you can read from using Core Audio and also forward to a device of your choice. I think what you are looking for can be found at CocoaLibSpotify

Stream song via Spotify SDK without Spotify account on the users' side?

Is it possible to build an iOS app that streams from spotify in a way where it won't need the user to login to Spotify? In a way where only our application is registred.
It is just not clear after scanning through the SDK / API section.
Disclaimer: I didn't work with the Spotify SDK
It should be possible. I suppose you can hardcode the login info in the code directly, and have the app login to spotify with the same user account every time (the one hardcoded in the app).
On the other hand, I don't see a good reason why you would want all the users of your app to connect as the same user to Spotify. But that is your decision :).
Also, I think you should also check the Spotify terms and conditions before you do that. Not sure if that's an issue or not.

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