Enable autoGain & echoCancel when streaming: setting failed with error code -10879

[pigheartCN]

The following code setup failed
`
let propsize = UInt32(MemoryLayout.size)

        var echoCancel = false
        var a = AudioUnitSetProperty(audioEngine.inputNode.audioUnit!,
                             kAUVoiceIOProperty_BypassVoiceProcessing,
                             kAudioUnitScope_Global,
                             AudioUnitElement(bus),
                             &echoCancel,
                             propsize)
        if a != noErr {
            print("record  can't enable Global echoCancellation:\(a)")
        }

        var autoGain = true
        var b = AudioUnitSetProperty(audioEngine.inputNode.audioUnit!,
                             kAUVoiceIOProperty_VoiceProcessingEnableAGC,
                             kAudioUnitScope_Global,
                             AudioUnitElement(bus),
                             &autoGain,
                             propsize)
        if b != noErr {
            print("record  can't enable Global enableAGC:\(b)")
        }

`

[pigheartCN]

the log:
record can't enable Global echoCancellation:-10879
record can't enable Global enableAGC:-10879

[pigheartCN]

Use the following way to set up, you can achieve the effect
if #available(iOS 13.0, *) { inputNode.isVoiceProcessingBypassed = false inputNode.isVoiceProcessingAGCEnabled = true try inputNode.setVoiceProcessingEnabled(true) } else { // Fallback on earlier versions }

However, with quite a few crashes appear in the following method
audioEngine.inputNode.installTap(onBus: bus, bufferSize: 2048, format: srcFormat) { (buffer, _) -> Void in self.stream( buffer: buffer, dstFormat: dstFormat, converter: converter, recordEventHandler: recordEventHandler ) }

The log is as follows:
`CrashDoctor Diagnosis: Application threw exception com.apple.coreaudio.avfaudio: required condition is false: IsFormatSampleRateAndChannelCountValid(format)
Thread 0 Crashed:
0 CoreFoundation 0x0000000197206b28 __exceptionPreprocess + [ : 164]

1 libobjc.A.dylib 0x000000018f062f78 objc_exception_throw + [ : 60]

2 CoreFoundation 0x000000019728c234 +[NSException raise:format:]

3 AVFAudio 0x00000001b0bf2a84 AVAE_RaiseException(NSString*, ...) + [ : 52]

4 AVFAudio 0x00000001b0c54c78 AUGraphNodeBaseV3::CreateRecordingTap(unsigned long, unsigned int, AVAudioFormat*, void ( block_pointer)(AVAudioPCMBuffer*, AVAudioTime*)) + [ : 760]

5 AVFAudio 0x00000001b0cccf1c -[AVAudioNode installTapOnBus:bufferSize:format:block:] + [ : 1420]

6 record_darwin 0x000000010e0934ac RecorderStreamDelegate.start(config:recordEventHandler:) + [ : 0]

7 record_darwin 0x000000010e08cd70 Recorder.startStream(config:) + [Recorder.swift : 53]

8 record_darwin 0x000000010e09a25c $s13record_darwin17SwiftRecordPluginC6handle_6resultySo17FlutterMethodCallC_yypSgctF015$syXlSgIeyBy_ypM7Iegn_TRyXlSgIeyBy_Tf1ncn_nTf4nng_n + [SwiftRecordPlugin.swift : 96]

9 record_darwin 0x000000010e097648 @objc SwiftRecordPlugin.handle(_:result:) + [ : 0] `