Yes it does, just like any other audio output device. That’s not my issue. The issue is how to make the OS output to that device at the desired bitrate programmatically. I know I can change the bitrate in Audio Midi Setup manually.
-Kenny > On Apr 18, 2018, at 2:37 PM, Patrick Cusack <patrickcus...@mac.com> wrote: > > > >> On Apr 18, 2018, at 2:25 PM, Kenny Leung <kenny_le...@pobox.com >> <mailto:kenny_le...@pobox.com>> wrote: >> >> Hi Patrick. >> >> I’m trying to write my own hi-res audio player. I’ve already been successful >> in playing a 24/192kHz audio file on both iOS and macOS using code based on >> what is written here: >> https://developer.apple.com/library/content/documentation/MusicAudio/Conceptual/AudioQueueProgrammingGuide/AQPlayback/PlayingAudio.html >> >> <https://developer.apple.com/library/content/documentation/MusicAudio/Conceptual/AudioQueueProgrammingGuide/AQPlayback/PlayingAudio.html> >> >> However, the CoreAudio system automatically converts the sample rate >> internally to whatever the output rate is set to (via Audio Midi Setup on >> Mac, and some unknown method on iOS). >> >> On iOS, you can set AVAudioSession.sampleRate, but output still won’t go >> higher than 48kHz. >> >> I’m using an XDuoo XD-05 >> (http://www.xduoo.com/xduoo/En/ProductView.Asp?ID=17 >> <http://www.xduoo.com/xduoo/En/ProductView.Asp?ID=17>) with a display, so it >> tells me what the phone is outputting. I can use Onkyo player to play at >> 24/192kHz, but I can’t get my own app to play at any more than 48kHz. Sample >> rate conversion is precisely the thing I am trying to get away from. > > Does the XDuoo shows up as an output device in OSX? Specifically in the Sound > system preferences? > >> >> Thanks. >> >> -Kenny >> >> >>> On Apr 18, 2018, at 12:12 PM, Patrick Cusack <patrickcus...@mac.com >>> <mailto:patrickcus...@mac.com>> wrote: >>> >>> Your output device is going to determine your sample rate. Any audio you >>> play is going to be float so 24 bit isn’t a consideration as you will >>> convert the 24bit audio to float. As for your 192kHz audio, you will either >>> need to play it out of 192kHz device or perform sample rate conversion in >>> your audio graph. >>> >>> This stack overflow listing discusses handling sample rate conversion: >>> >>> https://stackoverflow.com/questions/6610958/os-x-ios-sample-rate-conversion-for-a-buffer-using-audioconverterfillcomplex >>> >>> <https://stackoverflow.com/questions/6610958/os-x-ios-sample-rate-conversion-for-a-buffer-using-audioconverterfillcomplex>
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