问题
I am stuck with AUGraph for a while now and would really appreciate if my problem is resolved. What is am trying to do right now is to play data(bytes) coming from UDP. I have successfully achieved how to play data using AUGraph but i can't figure out how to change its playback speed.
My current scenario is to get Data from UDP, pass it a converter -> newTimePitch -> converter -> ioUnit.
Converters: Converters, convert ASBD of 48000 to desired format for timePitch and again convert it back to 48000 to play from ioUnit.
IOUnit Currently for demonstration i have removed the UDP and played revert back by using 2 different ioUnit (One for recording and other for playing).
CircularBuffer In Recording callback i am pushing data into my circular buffer and in playback Callback i am poping data from it and memcpy to my ioData
Don't be overwhelmed by the code you see. Its simple.
Starting AUGraph and Recording AudioUnit.
private func startRecordingUnit()
{
check(error: AUGraphStart(graph!), description: "Failed to start AUGraph")
check(error: AudioOutputUnitStart(audioUnit!), description: "Failed to start recording
audio unit.")
}
Setup AUGraph
private func setupRecordingUnit(){
var description = AudioComponentDescription(
componentType: OSType(kAudioUnitType_Output),
componentSubType: OSType(kAudioUnitSubType_VoiceProcessingIO),
componentManufacturer: OSType(kAudioUnitManufacturer_Apple),
componentFlags: 0,
componentFlagsMask: 0
)
let inputComponent = AudioComponentFindNext(nil, &description)
check(error: AudioComponentInstanceNew(inputComponent!, &audioUnit), description:
"Failed to init recording audio unit.")
check(error: AudioUnitSetProperty(
audioUnit!,
AudioUnitPropertyID(kAudioOutputUnitProperty_EnableIO),
AudioUnitScope(kAudioUnitScope_Input),
kInputBus,
&flag,
MemoryLayoutStride.SizeOf32(flag)
),
description: "Failed to set enable IO for recording."
)
check(error: AudioUnitSetProperty(
audioUnit!,
AudioUnitPropertyID(kAudioUnitProperty_StreamFormat),
AudioUnitScope(kAudioUnitScope_Output),
kInputBus,
&ioFormat!,
MemoryLayoutStride.SizeOf32(ioFormat)
),
description: "Failed to set stream format on output unit with scope input."
)
check(error: NewAUGraph(&graph), description: "Failed to create AU Graph")
check(error: AUGraphOpen(graph!), description: "Failed to open AUGraph")
var outputDesc = AudioComponentDescription(
componentType: OSType(kAudioUnitType_Output),
componentSubType: OSType(kAudioUnitSubType_VoiceProcessingIO),
componentManufacturer: OSType(kAudioUnitManufacturer_Apple),
componentFlags: 0,
componentFlagsMask: 0
)
var firstConverterDesc = AudioComponentDescription(
componentType: OSType(kAudioUnitType_FormatConverter),
componentSubType: OSType(kAudioUnitSubType_AUConverter),
componentManufacturer: OSType(kAudioUnitManufacturer_Apple),
componentFlags: 0,
componentFlagsMask: 0
)
var pitchConverterDesc = AudioComponentDescription(
componentType: OSType(kAudioUnitType_FormatConverter),
componentSubType: OSType(kAudioUnitSubType_NewTimePitch),
componentManufacturer: OSType(kAudioUnitManufacturer_Apple),
componentFlags: 0,
componentFlagsMask: 0
)
var secondConverterDesc = AudioComponentDescription(
componentType: OSType(kAudioUnitType_FormatConverter),
componentSubType: OSType(kAudioUnitSubType_AUConverter),
componentManufacturer: OSType(kAudioUnitManufacturer_Apple),
componentFlags: 0,
componentFlagsMask: 0
)
check(error: AUGraphAddNode(graph!, &firstConverterDesc, &firstConverterNode),
description: "Failed to Add Node of First desc")
check(error: AUGraphAddNode(graph!, &pitchConverterDesc, &newTimePitchNode),
description: "Failed to Add Node of new Time Desc")
check(error: AUGraphAddNode(graph!, &secondConverterDesc, &secondConverterNode),
description: "Failed to Add Node of Second desc")
check(error: AUGraphAddNode(graph!, &outputDesc, &outputNode), description: "Failed to
add node of output desc")
check(error: AUGraphNodeInfo(graph!, firstConverterNode, nil, &firstConverterUnit),
description: "Failed to get Node Info of FIRST Unit")
check(error: AUGraphNodeInfo(graph!, newTimePitchNode, nil, &newTimePitchUnit),
description: "Failed to get Node Info of new Time Unit")
check(error: AUGraphNodeInfo(graph!, secondConverterNode, nil, &secondConverterUnit),
description: "Failed to get Node Info of SECOND Unit")
check(error: AUGraphNodeInfo(graph!, outputNode, nil, &outputUnit), description: "Failed
to get Node Info of output Unit");
var sizeASBD = MemoryLayoutStride.SizeOf32(AudioStreamBasicDescription())
var ioASBDin = AudioStreamBasicDescription()
var ioASBDout = AudioStreamBasicDescription()
AudioUnitGetProperty(newTimePitchUnit!, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, kOutputBus, &ioASBDin, &sizeASBD);
AudioUnitGetProperty(newTimePitchUnit!, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output, kOutputBus, &ioASBDout, &sizeASBD);
check(error: AudioUnitSetProperty(firstConverterUnit!, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, kOutputBus, &ioFormat, MemoryLayoutStride.SizeOf32(ioFormat)),
description: "Failed to set property of FIRST Unit")
check(error: AudioUnitSetProperty(firstConverterUnit!, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output, kOutputBus, &ioASBDin, MemoryLayoutStride.SizeOf32(ioASBDin)),
description: "Failed to set property first unit to temp format")
check(error: AudioUnitSetProperty(newTimePitchUnit!, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, kOutputBus, &ioASBDin, MemoryLayoutStride.SizeOf32(ioASBDin)),
description: "Failed to set property of new Time Pitch")
check(error: AudioUnitSetProperty(newTimePitchUnit!, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output, kOutputBus, &ioASBDout, MemoryLayoutStride.SizeOf32(ioASBDout)),
description: "Failed to set property of new Time Pitch OUTOUT")
check(error: AudioUnitSetProperty(secondConverterUnit!, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, kOutputBus, &ioASBDout, MemoryLayoutStride.SizeOf32(ioASBDout)),
description: "Failed to set property of Second Converter Unit")
check(error: AudioUnitSetProperty(secondConverterUnit!, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output, kOutputBus, &ioFormat, MemoryLayoutStride.SizeOf32(ioFormat)),
description: "Failed to set property of Second Converter Unit to io Format")
check(error: AudioUnitSetProperty(outputUnit!, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, kOutputBus, &ioFormat, MemoryLayoutStride.SizeOf32(ioFormat)),
description: "Failed to set property of OUTPUT Unit")
// ************************************* RECORDING
****************************************************
var recordingCallback = AURenderCallbackStruct(
inputProc: AudioController_RecordingCallback,
inputProcRefCon: UnsafeMutableRawPointer(Unmanaged.passUnretained(self).toOpaque())
)
check(error: AudioUnitSetProperty(
audioUnit!,
AudioUnitPropertyID(kAudioOutputUnitProperty_SetInputCallback),
AudioUnitScope(kAudioUnitScope_Global),
kInputBus,
&recordingCallback,
MemoryLayout<AURenderCallbackStruct>.size.ui
),
description: "Failed to set property on recording callback."
)
// *************************************** RECORDING END
****************************************************
var playbackCallback = AURenderCallbackStruct(
inputProc: AudioController_PlaybackCallback,
inputProcRefCon: UnsafeMutableRawPointer(Unmanaged.passUnretained(self).toOpaque())
)
check(error: AUGraphConnectNodeInput(graph!, firstConverterNode, 0, newTimePitchNode,
0), description: "Failed to connect FIRST AND timePitch Nodes")
check(error: AUGraphConnectNodeInput(graph!, newTimePitchNode, 0, secondConverterNode,
0), description: "Failed to connect timePitch AND Second Nodes")
check(error: AUGraphConnectNodeInput(graph!, secondConverterNode, 0, outputNode, 0),
description: "Failed to connect Second AND OUTPUT Nodes")
check(error: AudioUnitSetProperty(outputUnit!, kAudioUnitProperty_SetRenderCallback,
kAudioUnitScope_Output, kOutputBus, &playbackCallback,
MemoryLayout<AURenderCallbackStruct>.size.ui), description: "Failed to set Property for
varispeed Unit 1")
check(error: AUGraphInitialize(graph!), description: "Unable to initialize AUGraph")
}
Recording is working fine but playbackCalback doesn't run after I connect it with AUConvertor.
For testing purposes I removed connections AUGraphConnectNodeInput and it started playing. I think something is wrong with connections and I would really appreciate if I understand what is causing the problem.
- https://stackoverflow.com/users/1313967/dave234
- https://stackoverflow.com/a/41774145
- https://stackoverflow.com/a/32872368
- Connection of varispeed with RemoteIO in iOS
I have made couple of searches but can't find any useful help.
回答1:
The problem might be that you are setting two inputs to your IO node (remote or voice processing), and no inputs to your audio graph.
来源：https://stackoverflow.com/questions/60986365/ios-no-output-when-augraphconnectnodeinput-is-set