Cannot set channels number for the output of a USB audio 2.0 class compliant device

2016-03-30 Thread Philippe Wicker
Hello all, Don’t know if I should have posted this to the USB list but as it concerns the firmware of an audio 2.0 device I thought that there could be people here able to give me some hints about my problems. I’m working on the firmware of a device which is a USB audio 2.0 class compliant d

Re: Cannot set channels number for the output of a USB audio 2.0 class compliant device

2016-03-31 Thread Philippe Wicker
configurations. Sorry I don't have time for a more complete answer, but hopefully one or more of the ideas above will give you something to investigate that might prove useful. It has been useful, thanks. Brian Willoughby Sound Consulting On Mar 30, 2016, at 6:02 AM, Philippe Wicker

Re: Cannot set channels number for the output of a USB audio 2.0 class compliant device

2016-04-04 Thread Philippe Wicker
So I'll contact them to analyze it. Anyway, thank you for your help. Philippe On 03/04/16 04:56, Brian Willoughby wrote: Philippe, On Mar 31, 2016, at 6:40 AM, Philippe Wicker wrote: On 31/03/16 07:17, Brian Willoughby wrote: https://developer.apple.com/library/mac/technotes/tn2274/_in

Re: EXS24/SF2 sample limits on iOS

2017-07-20 Thread Philippe Wicker
This is how it can be done With MacOS: https://stackoverflow.com/questions/3166783/how-to-increase-the-limit-of-maximum-open-files-in-c-on-mac-os-x/3214064#3214064 Maybe you can use the same APIs with iOS? > On 20 Jul 2017, at 00:48, Paul Davis wrote: > > On OSX/MacOS, the limit can be modifie

Re: Driving a USB device at 32 bits per sample

2018-04-04 Thread Philippe Wicker
AFAIK CoreAudio don’t allow a user to get the raw samples from the device, it always provide audio data with a 32 bit float format (single precision). Device native PCM data are converted at some point (within the driver? Or maybe in the HAL?) to this float format before being delivered to the u

Re: Driving a USB device at 32 bits per sample

2018-04-04 Thread Philippe Wicker
> Yes, that's all true, but not relevant (well, not to me). I want the device > to be operating in 32 bit mode, regardless of how Core Audio actually > delivers the data. > > Paul Sanders. > > > On 04/04/2018 15:09, Philippe Wicker wrote: > > AFAIK CoreAudio