Re: iPad Pro USB audio
Re: iPad Pro USB audio
- Subject: Re: iPad Pro USB audio
- From: Jean-Charles Rousset via Coreaudio-api <email@hidden>
- Date: Thu, 8 Aug 2019 16:17:36 +0200
I have just discovered another problem of gain in input.
For some devices, input gain is at 5 to 10 times smaller than expected (than
lightning device).
Our Asynchronous XMOS based devices have no problem. However, the gain on
entry-price-level synchronous/adaptive microphone is really low.
I will fill a new radar.
Thanks,
JC
> On 8 Aug 2019, at 14:02, Jean-Charles Rousset <email@hidden> wrote:
>
> Sam,
>
> Sorry for my late reply.
>
> Regarding the bug with the iPad Pro detecting all USB audio devices as
> Headphones (wired devices):
> I have now access to the name and UID of the port, so, indeed I can now find
> a workaround.
> However, is there any reason why AVAudioSessionDescription portType stopped
> returning USB devices on iPad Pro?
> Will it be deprecated or is it still a bug?
> I cannot test it here but is there the same problem with HDMI devices?
>
> Thanks,
> JC
>
>
>
>
>> On 3 Jul 2019, at 16:31, Sambasevam Shanmugam
>> <email@hidden <mailto:email@hidden>>
>> wrote:
>>
>> JC,
>>
>> I see that you’ve marked this issue as unresolved - 48900956
>>
>> You filed that radar to track 2 separate issues:
>> 1. High gain for usb devices
>> 2. Some USB devices recognized as headphones
>>
>> The radar was used to fix #1. Please open a separate radar for #2 and mark
>> 48900956 as resolved if you don’t see the high gain issue.
>>
>> As for #1, is there any impact for you if the device shows up as headphones?
>>
>> -Sam
>>
>>> On Apr 1, 2019, at 11:00 AM, Sambasevam (IMG CoreAudio) Shanmugam
>>> <email@hidden <mailto:email@hidden>>
>>> wrote:
>>>
>>> Hi Jean,
>>>
>>> I’ve got the information I wanted, so no further action is required on your
>>> part.
>>>
>>> -Sam
>>>
>>>> On Mar 28, 2019, at 3:28 AM, Jean-Charles Rousset <email@hidden
>>>> <mailto:email@hidden>> wrote:
>>>>
>>>> Hi Sam,
>>>>
>>>> Sorry, bad translation, it is indeed the Voice Memos app. I have updated
>>>> the radar.
>>>> Can you please tell me how to proceed to sysdiagnose on the iPad Pro? I
>>>> could not find the info.
>>>> Thanks.
>>>> JC
>>>>
>>>>
>>>>> Le 26 mars 2019 à 19:52, Sambasevam (IMG CoreAudio) Shanmugam
>>>>> <email@hidden <mailto:email@hidden>>
>>>>> a écrit :
>>>>>
>>>>> Hi JC,
>>>>>
>>>>> For radar 48900956 - which audio interface, and which input are you
>>>>> using? By the Apple Recorder app, do you mean voice memos?
>>>>>
>>>>> -Sam
>>>>>
>>>>>> On Mar 22, 2019, at 4:29 AM, Jean-Charles Rousset <email@hidden
>>>>>> <mailto:email@hidden>> wrote:
>>>>>>
>>>>>> Hi Brian, Gordon, Sam,
>>>>>>
>>>>>> Sorry for my late reply. I’m currently attending a show with tight
>>>>>> schedule.
>>>>>>
>>>>>> Brian, Gordon, I plugged a device in the thunderbolt 3 (USB-C) connector
>>>>>> of a MacBook Pro and everything looks normal. Gain max is at 0dB and the
>>>>>> recording seems fine with both garageband or audacity softwares.
>>>>>>
>>>>>> Sam, for now I have tested the Apple Recorder app and the Superpowered
>>>>>> SDK on iOS. Both gave the same results: USB devices are detected as
>>>>>> headphones/headsets and initial input gain is high (+29dB).
>>>>>> The radar ID is 48900956.
>>>>>> I will do the sysdiagnose as soon as I can.
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> Jean-Charles
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>> Le 20 mars 2019 à 23:50, Sambasevam Shanmugam
>>>>>>> <email@hidden
>>>>>>> <mailto:email@hidden>> a écrit :
>>>>>>>
>>>>>>> Hi JC,
>>>>>>>
>>>>>>> Can you please tell me the audio interfaces you’ve tried so far? If
>>>>>>> you’ve filed a radar already, can you please provide the ID?
>>>>>>>
>>>>>>> Also, can you please send me the sysdiagnose with one of the audio
>>>>>>> interfaces attached?
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Sam
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