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1. Re: exceptions to using RenderCallback (Matt Grippaldi)

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1. Re: exceptions to using RenderCallback (Matt Grippaldi)

Subject: 1. Re: exceptions to using RenderCallback (Matt Grippaldi)
From: Marcin Rakowski <email@hidden>
Date: Fri, 29 Jul 2016 13:27:45 +0000

Hi Matt,

thanks for quick reply. It's very helpful. Internet intermittent here, hence late response.

It does seem that a mixer input can only receive samples from other units or a callback with a precedence to an already connected unit. When I disconnected the FilePlayerAU and connected another mixer without attaching any units to its inputs and set the callbacks on them it started working correctly.

regards,

- Marcin Rakowski

On Thu, Jul 21, 2016 at 7:00 PM, <email@hidden> wrote:

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Today's Topics:

1. Re: exceptions to using RenderCallback (Matt Grippaldi)
2. AudioUnitScheduleParameters with kStereoMixerParam_Volume
(Benjamin Federer)

----------------------------------------------------------------------

Message: 1
Date: Wed, 20 Jul 2016 17:12:52 -0400
From: Matt Grippaldi <email@hidden>
To: email@hidden
Subject: Re: exceptions to using RenderCallback
Message-ID:
<email@hidden">email@hidden>
Content-Type: text/plain; charset="utf-8"

If I understand the issue correctly to the best of my knowledge you should create another mixer input buss and add the render callback to the graph. You can not have a render callback on the same input that you are using for the AudioFilePlayer AU.
Here is a snippet from some test code I have that renders multiple tracks of audio using graph render callbacks.

UInt32 inputBuss = 0;
for (int t=0; t < trackCount; ++t)
{
AURenderCallbackStruct input;
input.inputProc = AudioTrackRenderProc;
input.inputProcRefCon = &tracks[t];

CheckError(AudioUnitSetProperty(mixerUnit, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, inputBuss, streamFormat, sizeof(AudioStreamBasicDescription)),
"Failed to set mixer buss input stream format.\n");
AUGraphSetNodeInputCallback(graph, mixerNode, inputBuss, &input);
++inputBuss;
}

And whatever you do, don’t forget to match the steam formats or you may get an earful of noise that you won’t soon forget.

Hope this helps.
- Matt

> On Jul 20, 2016, at 12:20 PM, Matt Grippaldi <email@hidden> wrote:
>
> If I understand the issue correctly to the best of my knowledge you should create another mixer input buss and add the render callback to the graph. You can not have a render callback on the same input that you are using for the AudioFilePlayer AU.
> Here is a snippet from some test code I have that renders multiple tracks of audio using graph render callbacks.
>
> UInt32 inputBuss = 0;
> for (int t=0; t < trackCount; ++t)
> {
> AURenderCallbackStruct input;
> input.inputProc = AudioTrackRenderProc;
> input.inputProcRefCon = &tracks[t];
>
> CheckError(AudioUnitSetProperty(mixerUnit, kAudioUnitProperty_StreamFormat,
> kAudioUnitScope_Input, inputBuss, streamFormat, sizeof(AudioStreamBasicDescription)),
> "Failed to set mixer buss input stream format.\n");
> AUGraphSetNodeInputCallback(graph, mixerNode, inputBuss, &input);
> ++inputBuss;
> }
>
> And whatever you do, don’t forget to match the steam formats or you may get an earful of noise that you won’t soon forget.
>
> Hope this helps.
>
> - Matt Grippaldi
>
>
>
>
>
>
>
>
>
>
>> On Jul 20, 2016, at 6:31 AM, Marcin Rakowski <email@hidden <mailto:email@hidden>> wrote:
>>
>> Hi, I have a graph in which two separate AudioFilePlayer AUs are feediing into a Mixer unit that then outputs to Output unit. It works fine.
>>
>> Then I set up a render callback on the Mixer unit, but it never gets called.
>>
>> AURenderCallbackStruct input;
>>
>> input.inputProc = SineWaveRenderProc;
>>
>> input.inputProcRefCon = &mixerCallback;
>>
>> CheckError(AudioUnitSetProperty(mixerUnit,
>>
>> kAudioUnitProperty_SetRenderCallback,
>>
>> kAudioUnitScope_Output,
>>
>> 0,
>>
>> &input,
>>
>> sizeof(input)),
>>
>> "AudioUnitSetProperty failed");
>>
>>
>> Is this expected behaviour? The mixer is receiving samples on both inputs. Is there a way to switch where the unit is pulling data from, ie. inputs or RenderCallback?
>>
>> --
>>
>> Marcin
>> http://google.com/+MarcinRakowskiConnect <http://google.com/+MarcinRakowskiConnect>
>> _____________________________________
>> "There are many paths, but only one journey."
>>
>> _______________________________________________
>> Do not post admin requests to the list. They will be ignored.
>> Coreaudio-api mailing list (email@hidden <mailto:email@hidden>)
>> Help/Unsubscribe/Update your Subscription:
>>
>> This email sent to email@hidden
>

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------------------------------

Message: 2
Date: Thu, 21 Jul 2016 19:18:18 +0200
From: Benjamin Federer <email@hidden>
To: email@hidden
Subject: AudioUnitScheduleParameters with kStereoMixerParam_Volume
Message-ID: <email@hidden">email@hidden>
Content-Type: text/plain; charset=utf-8

Hello everyone

I am trying to ramp the input volume for one of the input busses of a stereo mixer unit (part of an AUGraph). Although I don’t get any errors when running my code, nothing happens at all, i.e. no audible volume changes occur. I am unsure what I am missing. Or could it be that the parameter just cannot be ramped at all – although it reports otherwise?

This is what I got so far:

AudioUnitParameter parameter = {
.mAudioUnit = mixerUnit,
.mParameterID = kStereoMixerParam_Volume,
.mScope = kAudioUnitScope_Input,
.mElement = busNumber
};

AudioUnitParameterInfo parameterInfo = {};
UInt32 parameterInfoSize = sizeof(AudioUnitParameterInfo);
error = AudioUnitGetProperty(parameter.mAudioUnit, kAudioUnitProperty_ParameterInfo, parameter.mScope, parameter.mParameterID, &parameterInfo, &parameterInfoSize);
if (error)
{
return error;
}

AudioUnitParameterOptions parameterOptions = parameterInfo.flags;
if ((parameterOptions & kAudioUnitParameterFlag_CanRamp) != kAudioUnitParameterFlag_CanRamp)
{
// parameter cannot be ramped-
return paramErr;
}

AudioUnitParameterEvent parameterEvent = {
.scope = parameter.mScope,
.element = parameter.mElement,
.parameter = parameter.mParameterID,
.eventType = kParameterEvent_Ramped,
.eventValues.ramp.startBufferOffset = 0,
.eventValues.ramp.durationInFrames = durationInFrames,
.eventValues.ramp.startValue = startValue,
.eventValues.ramp.endValue = endValue
};

error = AudioUnitScheduleParameters(parameter.mAudioUnit, &parameterEvent, 1);

Thanks for any help in advance

Benjamin

------------------------------

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End of Coreaudio-api Digest, Vol 13, Issue 107
**********************************************

--

Marcin

http://google.com/+MarcinRakowskiConnect

_____________________________________
"There are many paths, but only one journey."

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