Sorry if this question is obvious or duplicated. My 30 minutes of research led me nowhere.
We have an iPhone app that live streams video from the device to our remote Wowza servers.
We're looking to integrate the Swivl (motion tracking tripod) into our product, and it uses a wireless microphone that feeds into the 30-pin port of our iPhone. Swivl's SDK doesn't include anything about capturing audio from their hardware so I assume that it would be handled by the iPhone itself.
If I use the AVAudioRecorer, will it automatically route the audio input from the 30-pin port instead of the default microphone, or do I have to explicitly define the audio source?
Any clues help.
After a few tests, it seems that iOS automatically routes incoming audio signals.
There is no need to explicitly specify the source of the audio.
Straight from AVAudioRecorder documentation:
In iOS, the audio being recorded comes from the device connected by the user—built-in microphone or headset microphone, for example. In OS X, the audio comes from the system’s default audio input device as set by a user in System Preferences.
Related
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.
Is it possible to switch off audio output on device?
I need route the sound to phone's speaker when headphones are connected.
I need to connect some device via audio output(like connect headphones) but if i connected it the voice on ios device is blocked. I want turn off audio output and turn on when i need use this device.
This goes against Apple's Human Interface Guidelines. If you read the section on Technology usage you find a section labelled Sound. It describes the expected behaviour when using headphones:
http://developer.apple.com/library/ios/#documentation/UserExperience/Conceptual/MobileHIG/TechnologyUsage/TechnologyUsage.html#//apple_ref/doc/uid/TP40006556-CH18-SW3
I don't think so you can do this. Because apple is very strict and stick with their functionality.
I want to process the stereo output from iOS devices, no matter what application causes them and visualize it in real-time.
Is it possible to use the generic output device (or anything else) to get at the audio data which are currently being played? Maybe as an input to a remoteIO unit?
In other words: I want to do what aurioTouch2 does (FFT only) but instead of using the microphone as input source, I want to process everything which is coming out of the speakers at a given time.
Kind regards
If your own app is playing using the RemoteIO Audio Unit, you can capture that content. You can not capture audio your app is playing using many of the other audio APIs. The iOS security sandbox will prevent your app from capturing audio that any other app is playing (unless that app explicitly exports audio via the Inter-App Audio API or equivalent).
Let us say I have an audio iPhone app which takes input from the microphone.
Now, although I haven't tried this myself, I believe the user could use an external microphone that plugs into the phonojack socket.
This means my audio unit could be receiving its input from the internal or the external microphone.
My guess is that iOS will automatically route from an external microphone if it is connected.
But what if I don't want that?
Is there a way to specify which microphone should be used?
I have looked in the audio session guide, I can find some setting regarding a Bluetooth headset. But that is as close as I can find. It appears that it is not possible. But I find that difficult to believe.
PS Also I am curious how it detects an external microphone... if I plug my headphones in, it should continue routing from the internal microphone. my headphones are just plain stereo headphones. but if I used my mobile phone's headphones ( on extra band on the Jack... they have a microphone built onto the cable where the individual earpiece strands meet ) I would expect it to pick up this source instead.
You have to use the AUHAL unit to set a specific input device as default input and then connect it with the AudioQueue.
Apple has a detailled Technical Note for that: Device input using the HAL Output Audio Unit
I am using Alert.startAudio to play an array of short values,
I want the same short[] to be played using the phone speaker, how could I do this ?
I believe it is played with speaker by default!
But if it's not, try to use AudioPathControl
See BB KB How To - Specify Audio Path Routing
UPDATE
BB Developer Journals - The BlackBerry Alert Class:
The next two methods will start and stop an audio alert on the audio channel selected by the user. An audio channel can be the internal headset, speaker, earpiece or a Bluetooth® headset.
maybe this should be configured somewhere in device...