Can’t listen to music OSStatus error

[corped12]

When i try to play music i get this OSStatus error every time and it will say on the app it’s playing but it isn’t playing

[iddu0]

The creator of this app is restarting development, it should get patched.

[iddu0]

I think if you pause then play it should work, correct me if I'm wrong.

[iddu0]

trying it now on my ipod touch 4g ios 6.1.6
EDIT: Confirmed, doesen't work

[Iemand005]

@corped12 Thanks for letting me know, I'm actually busy now reverse engineering Spotify's DRM so that I can build my own library that can live stream the encrypted audio from Spotify. As a backup plan I'm also adding another third party source for the audio temporarily until I can use Spotify's APIs directly. In case none of this works I'll add a fallback to fetch the audio from YouTube instead too.

[iddu0]

Yeah, the YouTube thing is smart
Thanks for making this amazing app!

[Iemand005]

Quick update:

I have done quite some digging into how Spotify's music is encrypted and how the app fetches the keys.
Downloading the encrypted music files has always been in the app, only getting the encryption key is a challenge.
I have the IV (salt) and know which encryption algorithm is used (AES-128-CTR). I have to find or make/port an implementation of the decryption algorithm to work on the older iOS, there's a chance the built in crypto libraries support this algorithm but I haven't checked that part yet as I need the keys before I can proceed with actually processing the data.

So far I have found 2 different techniques to obtain the keys.

1. Through playplay

This is a simple POST request to a specific and very sensitive endpoint. I have not yet gotten it to return any valuable data yet, and I know the data it returns is obfuscated, but I have an implementation of the deobfuscation algorithm.
I would prefer to get this one figured out because the request body would be a fixed value, only the URL and auth token have to be variable. I don't necessarily have to work with protobuf as I can simply compile the request body in advance because it's fixed data anyways.

2. Through the client websocket
   This is more complicated, it also uses protobuf, it's encrypted both ways, very annoying. I don't know of any proper way to use websockets with the limited APIs available for older iOS, I will probably have to make my own websocket library if I'm forced to go this route. I don't fully understand how websockets actually work yet, I will be looking into this further.

I expect to implement username and password login into the app next to the current oauth flow, using the login5 api, so you can log in without needing a second device with a browser.

A lot more complicated but possible to add is to implement zeroconf, so you can see and control your iPod as a device on other Spotify clients, like your phone or computer, and normally log in automatically from those without having to do anything in the app. Currently it doesn't let me play around with this because it complains about Spotify Premium but I'm believe it's possible to make this work without premium? The libary I'm using has premium hard coded in the info fields so I hope it's as simple as swapping that out.

While the Spotify part is progressing slowly I can also put my focus on YouTube if anyone is interested. Playing video from YouTube will be a bit harder, the built in video player library in iOS 2 and up is extremely basic and doesn't really support many codecs. Should be possible to get the MP4 720p 30FPS one from the old web api working, I hope. Playing audio from YouTube should be easy enough, I might look into YouTube Music's dedicated API too. I don't know yet how I will have a proper way to find relations between music on YouTube and on Spotify.

We are currently thus waiting for a reply from the people working on Lucida to see if we can find a way to receive the keys reliably.

[az2oo1]

hi, I`m so excited to try Spotify on my iPod again I just wanted to know how much time it would take for you to release the beta app

[iddu0]

There IS a release, but there are some bugs to address and as of now it doesn't work.

[SatinFoil]

I have the same problem, however my OSStatus error is different. Mine is -10875.
(I am using iOS 9 at the moment, so that could be an issue as it's made for iOS 6)

[Iemand005]

I have the same problem, however my OSStatus error is different. Mine is -10875. (I am using iOS 9 at the moment, so that could be an issue as it's made for iOS 6)

Thanks for letting me know. Other users have also reported this error. I will get back to this ASAP after my exams. Spotify made changes to their API again, the keys we had to decrypt using playplay no longer work.

I'm not sure what to do about this yet, the only working spotify download libraries remaining seem to be the ones using websockets which is quite challenging and fragile to implement. Latest commit to development contains a websocket library but it's far from functional.

I will come back to this, might for the time even continue with another alternative method for getting the audio by using Lucida's API. I hope to eventually have multiple ways to fetch the audio data in case one fails like it does now because Spotify of course doesn't want people ripping their audio even if that's not the intention here, I need a decrypted audio stream as there's no Widevine or so for the old iOS.

I'll also later create a specifically iOS 9 designed GUI for the app that also has extra features that are only in iOS 9 and above like picture in picture and stuff, and one for iOS 4 or even older.

Thanks for the feedback!

[iddu0]

Thanks for letting me know. Other users have also reported this error. I will get back to this ASAP after my exams. Spotify made changes to their API again, the keys we had to decrypt using playplay no longer work.

Good luck on those exams!