What SDK's does Audiobus use to provide inter-app audio routing? I am not aware of any Apple SDK that could facilitate inter-app communication for iOS and was under the impression that apps were sandboxed from each other so I'm really intrigued to hear how they pulled this off.
iOS allows inter-app communication via MIDI Sysex messages. AudioBus works by sending audio as MIDI Sysex message. You can read details from the developer himself:
http://atastypixel.com/blog/thirteen-months-of-audiobus/
My guess is that they use some sort of audio over network, because I've seen log statements when our app gets started even on a different device.
Don't really know about the details of the implementation, but this could be a way of staying in the "sandbox" constraint.
The Audiobus SDK (probably) use the Audio Session rules to "organize" all the sound output from the apps using their SDK, as you can see on their videos (on bottom of the page), the apps have an lateral menu to switch back and forwards between apps.
The Audio Session Category states:
Allows mixing: if yes, audio from other applications (such as the iPod) can continue playing when your application plays sound.
This way Audiobus can "control" the sound and allow the session to be persistent between the apps.
Related
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
So with iOS 8, we can now record the screen of iOS devices. I've searched extensively and cannot find a way to detect, let alone prevent, this recording. The app I'm working on deals with some potentially sensitive information and images and would like to prevent this if at all possible.
Thank you in advance for your responses and insights!
Anthony
Apparently, there is some way to detect whether a display or QuickTime streaming is connected, because the Netflix app will show an error when that is the case (which also means you can't just use an iOS device and stream to your computer to watch it in big). The app works perfectly if QuickTime streaming is off with the cable is plugged in.
Maybe it just detects whether an external display is connected, and screen recording behaves like that, so basically you might have some success with these APIs and notifications.
Also, you could use an encrypted HTTP Live Stream according to Apple which would be blacked out in the stream / the recording.
iOS 6.0 brought "multi-route audio" support to the iPhone / iPad.
DJay app for example benefits of it by allowing the user to hear one deck in headphones while playing the other.
The only mention of it is in the AVAudioSession class reference :
AVAudioSessionCategoryMultiRoute
Allows you to output distinct streams of audio data to different output devices at the same time. For example, you would use this category to route audio to both a USB device and a set of headphones. Use of this category requires a more detailed knowledge of, and interaction with, the capabilities of the available audio routes.
This category may be used for input, output, or both.
Available in iOS 6.0 and later.
How to route two distinct streams to different routes ? Especially using Remote I/O ?
Thanks!
Answering to myself : there's actually no information in iOS Developer Library, but hopefully, there's all the info needed in WWDC developer sessions.
Search for: WWDC 2012 Session 505: Audio Session and Multiroute Audio in iOS by Torrey Holbrook Walker.
I hope that may help somebody else.
I am currently writing an app using XCode that will allow the streaming of medical data to the app. Using the Alive Heart Monitor which streams live heartbeats over bluetooth spp, I want to be able to receive those live streams into my app.
Currently, I am not able to discover the AHM device and am not sure about how to go about receiving the live stream.
Is there any way to do this?
I've seen this article: http://www.devx.com/wireless/Article/43502/1954, however it seems to only work between 2 iPad/iPhones. I want to be able to just receive the live stream from a non-iOS device.
Any help would be appreciated!
I have consulted with developers on Apple forums and was made aware that this was not possible as iPad does not have support for the bluetooth SPP profile.
is it possible to enable Airplay on an iPad app I've made that streams audio (no video). If so, is there any sample code out there?
thanks for any help.
This may be of interest:
AirPlay Overview: Encryption and Authentication
This part indicates that it may be possible to play what is streaming over AirPlay:
Bear in mind that if the video is playing over AirPlay, the viewer is watching on a television with no way to enter a password. In such cases, the viewer must authenticate on the device that is relaying the video via AirPlay, which may be in another room. This situation has other implications, including how long cookies or other authentication tokens should last before expiration. You should configure your server accordingly.
NO
The RAOP protocol is private and the stream is encrypted.
Source: http://en.wikipedia.org/wiki/Remote_Audio_Output_Protocol