>
> You mentioned copying the data over in a single IO callback - I'm not quite
> sure what you meant by that? Would I just setup an input callback and send
> the incoming samples directly to the output device?
yes, except you are using the aggregate, so you are only dealing with that one
devi
if i remember correctly, that sends audio from one device to another?
and there’s no compensation in that code for clock drift?
i would instead use an aggregate device (created in Audio MIDI Setup, or you
can do it programmatically with a little pain)
with both devices, enabling drift correction
I do exactly that (in Obj-C) with AAC files and the AVAudioPCMBuffer’s
floatChannelData is indeed raw PCM data.
> On Jul 2, 2018, at 1:36 PM, Waverly Edwards wrote:
>
> Would someone provide guidance on how I can decompress M4A and AAC files into
> memory as raw LPCM.
> I need to decompress M
king on Apple platforms:
>
> https://opensource.apple.com/source/xnu/xnu-2050.18.24/libsyscall/wrappers/memcpy.c
>
> <https://opensource.apple.com/source/xnu/xnu-2050.18.24/libsyscall/wrappers/memcpy.c>
>
> - Sophia
>
>
>> On Feb 27, 2018, at 12:00 PM, Ma
OK thanks
> I would be very surprised if memcpy() were on a list of functions that lock.
Yeah me too, but I wanted to be absolutely sure.
Even googling “memcpy thread safe” came up with a(n unverified) comment that it
IS on Solaris, which probably means it takes a mutex, right?
Perhaps my quest
I have to admit that in the past i’ve done some dubious things inside the audio
thread -- and i’m not proud of it.. ;)
But in some recent C++ work, I'm not letting myself call any function I’m not
absolutely sure is lock-free.
Ross Bencina’s article is still my go-to-reference:
http://www.rossb
IOThread! Can’t figure out why… .
>
> Hint that can help: I am recording two live streams (stereo) at the same time
> (i.e. two audio files).
>
> Any hints?
>
>> On 14 Feb 2018, at 19:01, Matt Ingalls wrote:
>>
>> Have you tried AVAudioFile?
>>
>>
Have you tried AVAudioFile?
> On Feb 13, 2018, at 12:59 PM, Arshia Cont wrote:
>
> Hello list,
>
> This is my first post here so sorry if this is already asked!
>
> We have been using ExtAudioFileWriteAsync on iOS successfully to write two
> PCM Audio Streams to disk. We have been getting rep
is there a way to change the frame position of a playing AVAudioPlayerNode?
the only thing i have found that works is stop the node, reschedule with the
new frame position, and restart the node.
generating more clicks & dropouts than i want when i scrubbing through the
file...
thanks,
matt
___
curious if you tried turning off multitasking gestures?
> On Oct 2, 2015, at 11:32 AM, moForte Business Development
> wrote:
>
> Here are a couple videos that demonstrate the problem using Garage Band. The
> lost touches issue for iPad Air 2/iOS 9 is independent of app. It can be
> demonst
maybe something along these lines?
// get input device
AudioObjectID inputDevice;
UInt32 size;
AudioObjectPropertyAddress add = {kAudioHardwarePropertyDefaultInputDevice,
kAudioObjectPropertyScopeGlobal,, kAudioObjectPropertyElementMaster};
AudioObjectGetPropertyDataSize(kAud
you can also use a soundfont with an AUSampler, which is VERY easy
— you just pass the url of the sound font file when setting the
kAUSamplerProperty_LoadPresetFromBank property.
here’s another thing i came across recently that might be useful:
i was using a high priority real-time thread for
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