Re: AudioUnitRender returning -10863 if no input device is present
Re: AudioUnitRender returning -10863 if no input device is present
- Subject: Re: AudioUnitRender returning -10863 if no input device is present
- From: Doug Wyatt <email@hidden>
- Date: Wed, 21 Oct 2009 11:29:28 -0700
I can't be more sure without looking at whatever inRenderProc is
doing, but I think you must be trying to call AudioUnitRender on
element/bus 1 when input is disabled. Don't do that; that's where mic
(etc.) input arrives and you've disabled input. inRenderProc's
responsibility is to provide the output samples. In some examples it
does this by thru-ing the audio input. You want to simply give it some
other audio, I assume, so don't do anything with bus 1.
Doug
On Oct 21, 2009, at 8:11 , Andrew Smith wrote:
I'm still not getting this to work. I removed the
kAudioOutputUnitProperty_EnableIO enable input, but I still get the
same errors in the callback. I also tried explicitly disabling the
input, no luck.
Here is my setupRemoteIO code:
// Open the output unit
AudioComponentDescription desc;
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = kAudioUnitSubType_RemoteIO;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;
AudioComponent comp = AudioComponentFindNext(NULL, &desc);
XThrowIfError(AudioComponentInstanceNew(comp, &inRemoteIOUnit),
"couldn't open the remote I/O unit");
UInt32 one = 1;
// XThrowIfError(AudioUnitSetProperty(inRemoteIOUnit,
kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Input, 1, &one,
sizeof(one)), "couldn't enable input on the remote I/O unit");
XThrowIfError(AudioUnitSetProperty(inRemoteIOUnit,
kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0,
&inRenderProc, sizeof(inRenderProc)), "couldn't set remote i/o
render callback");
UInt32 size = sizeof(outFormat);
XThrowIfError(AudioUnitGetProperty(inRemoteIOUnit,
kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0,
&outFormat, &size), "couldn't get the remote I/O unit's output
client format");
outFormat.mSampleRate= auSampleRate;
outFormat.mFormatID= kAudioFormatLinearPCM;
outFormat.mFormatFlags= kAudioFormatFlagIsSignedInteger |
kAudioFormatFlagIsPacked;
outFormat.mFramesPerPacket= 1;
outFormat.mChannelsPerFrame= 2;
outFormat.mBitsPerChannel= 16;
outFormat.mBytesPerPacket= 4;
outFormat.mBytesPerFrame= 4;
XThrowIfError(AudioUnitSetProperty(inRemoteIOUnit,
kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0,
&outFormat, sizeof(outFormat)), "couldn't set the remote I/O unit's
input client format");
XThrowIfError(AudioUnitSetProperty(inRemoteIOUnit,
kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 1,
&outFormat, sizeof(outFormat)), "couldn't set the remote I/O unit's
input client format");
XThrowIfError(AudioUnitInitialize(inRemoteIOUnit), "couldn't
initialize the remote I/O unit");
// NSLog(@"AudioUnitInitialize succeeds");
On Thursday, October 15, 2009, at 11:47AM, "Doug Wyatt" <email@hidden
> wrote:
When there's no input device present, you have to disable the input
side of AURemoteIO via kAudioOutputUnitProperty_EnableIO. If the mic
availability changes on a Touch and you want to change the
enabledness
of input on a unit you've already initialized, you'll hit an issue --
avoid it by disposing the AURemoteIO and creating a new one.
Doug
On Oct 14, 2009, at 20:11 , Andrew Smith wrote:
Hi
In my audio processing tools I normally use a RemoteIO setup that
lets me read in the input buffer, and stuff in values that end up in
the audio output. I do have one output-only function, but if it's on
a Touch with no mic plugged in, my performThru functions gest -10863
when it calls AudioUnitRender.
Is there any way that I can still get my data into the output
without an input device being present?
thanks!
Andrew Smith
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