在iPhone模拟器中录制音频错误

Question

在iPhone模拟器中使用AVFoundation录制音频时，我会得到以下错误。我的代码在设备上正常工作。

有什么想法吗？提前谢谢。

2012-09-15 17:51:39.592 MySpellings538 538:3503错误加载/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn: dlopen(/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn，262)：符号未找到：__CFObjCIsCollectable引用自: /System/Library/Frameworks/Security.framework/Versions/A/Security /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation in: /System/Library/Frameworks/Security.framework/Versions/A/Security 2012-09-15 17:51:39.598 MySpellings538 538:3503错误加载/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn: dlopen(/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn，( 262)：找不到符号:引用: /System/Library/Frameworks/Security.framework/Versions/A/Security的___CFObjCIsCollectable 预期在: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation in /System/Library/Frameworks/Security.framework/Versions/A/Security 2012-09-15 17:51:39.607 MySpellings538 538:3503错误加载/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn: dlopen(/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn，( 262)：找不到符号:引用: /System/Library/Frameworks/Security.framework/Versions/A/Security的__CFObjCIsCollectable /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation in: /System/Library/Frameworks/Security.framework/Versions/A/Security 2012-09-15 17:51:39.612 MySpellings538 538:3503错误加载/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn: dlopen(/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn，( 262)：找不到符号:引用: /System/Library/Frameworks/Security.framework/Versions/A/Security的___CFObjCIsCollectable 预期在: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.1.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation in /System/Library/Frameworks/Security.framework/Versions/A/Security 2012-09-15 17:51:40.932 MySpellings538 538:4907 aq@0xea13200: ConvertInput: AudioConverterFillComplexBuffer返回560226676，packetCount 21 2012-09-15 17:51:42.254 MySpellings538 538:C07等待输入终止刷新-错误！

Answer 1

在我的例子中，显示错误是因为我使用了错误的比特率：

我忘了我使用了Kbps，而AVEncoderBitRateKey使用了bps。所以，在我将比特率乘以1000之后，错误就消失了。

Answer 2

在将音频录制为m4a格式(AVFormatIDKey = kAudioFormatMPEG4AAC)时，在模拟器中录制音频也有问题。没有录制音频，控制台日志包含"AudioConverterFillComplexBuffer“错误。

但是，录制为.caf格式(kAudioFormatAppleIMA4)确实有效，对于某些人来说，这可能是一个变通的解决方案。

recordSettings = [NSDictionary
                  dictionaryWithObjectsAndKeys:
                  [NSNumber numberWithInt:AVAudioQualityMin],
                  AVEncoderAudioQualityKey,
                  [NSNumber numberWithInt:16],
                  AVEncoderBitRateKey,
                  [NSNumber numberWithInt: 1],
                  AVNumberOfChannelsKey,
                  [NSNumber numberWithFloat:16000.0],
                  AVSampleRateKey,
                  [NSNumber numberWithInt: kAudioFormatAppleIMA4],
                  AVFormatIDKey,
                  nil];