iPad USB Audio
iPad USB Audio
- Subject: iPad USB Audio
- From: Dominik Peklo <email@hidden>
- Date: Sat, 17 Apr 2010 00:16:34 +0800
Dear Bill,
iPad serving as a USB host for USB Audio devices is an interesting & unexpected development indeed. I'm hoping to get a clearer picture of the current situation as well as Apple's intentions for future of digital audio on portable devices. So far we've been working with Lingo 10, but this might prove a useful addition. I've got a number of questions and would appreciate your help in answering them:
First of all, our USB Audio products are exclusively running in Asynchronous mode, using sync pipe for data rate feedback as per UAC 1.0 specs. Does the iPad's current implementation support Asynchronous sinks? If not, are there any plans to add the support?
You have mentioned that the present implementation only supports 16bit format. Will it enumerate a device with multiple interface alternate settings, one of them being 16bit and the other 24bit?
As for supported samplerates, is there a list of required/mandatory samplerates like with Lingo 10? (32/44.1/48k) Will it enumerate a device supporting 88.2k and 96k in addition to the basic 32/44.1/48k?
When using Lingo 10, the iDevice sets the samplerate according to the track currently played. This is unlike Mac OS X which always outputs at the samplerate set in Audio MIDI Setup. How about iPad then - is it choosing samplerate on-the-fly during playback or is it more like a desktop OS X?
Is there an inherent difficulty in supporting formats upto 24/96 or is it just that nobody set the goal so high as of yet? What about the audio player in iPad - would it have any problem playing back 24/96 Apple Lossless tracks?
Can I use HID media controls for play/pause, prev/next etc. alongside the Audio functionality as part of my device to control the iPad?
Is this feature going to make it onto iPod touch / iPhone along with OS 4 release or will it be strictly iPad-specific?
Thanks!
Best Regards,
Dominik _______________________________________________
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