Iphone &引用;shm“打开失败”;使用RemoteIO初始化AudioUnitiInitialize时出现错误3
我正在尝试使用以下代码从Core Audio(远程I/O音频单元)获取麦克风输入:Iphone &引用;shm“打开失败”;使用RemoteIO初始化AudioUnitiInitialize时出现错误3,iphone,objective-c,avfoundation,core-audio,audiounit,Iphone,Objective C,Avfoundation,Core Audio,Audiounit,我正在尝试使用以下代码从Core Audio(远程I/O音频单元)获取麦克风输入: - (void)audioAU { enum : AudioUnitElement { kOutputElement = 0, kInputElement = 1 }; const UInt32 disableFlag = 0; const UInt32 enableFlag = 1; OSStatus err = noErr; N
- (void)audioAU
{
enum : AudioUnitElement {
kOutputElement = 0,
kInputElement = 1
};
const UInt32 disableFlag = 0;
const UInt32 enableFlag = 1;
OSStatus err = noErr;
NSError *error = nil;
// Configure & activate audio session
AVAudioSession *session = [AVAudioSession sharedInstance];
if (![session setCategory:AVAudioSessionCategoryRecord error:&error]) NSLog(@"Error configuring session category: %@", error);
if (![session setMode:AVAudioSessionModeMeasurement error:&error]) NSLog(@"Error configuring session mode: %@", error);
if (![session setActive:YES error:&error]) NSLog(@"Error activating audio session: %@", error);
NSLog(@"Session activated. sample rate %f", session.sampleRate);
NSLog(@"Number of channels %d", session.inputNumberOfChannels);
// Set up Remote I/O audio unit for audio capture
AudioComponent component = AudioComponentFindNext(NULL, &(const AudioComponentDescription){
.componentType = kAudioUnitType_Output,
.componentSubType = kAudioUnitSubType_RemoteIO,
.componentManufacturer = kAudioUnitManufacturer_Apple,
.componentFlags = 0,
.componentFlagsMask = 0
});
AudioComponentInstance unit;
// Create audio component
err = AudioComponentInstanceNew(component, &unit);
if (err != noErr) NSLog(@"Error instantiating audio unit: %ld", err);
// Enable input
err = AudioUnitSetProperty(unit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Input, kInputElement, &enableFlag, sizeof(enableFlag));
if (err != noErr) NSLog(@"Error enabling input for audio unit: %ld", err);
AudioStreamBasicDescription streamDesc = {
.mSampleRate = session.sampleRate,
.mFormatID = kAudioFormatLinearPCM,
.mFormatFlags = kAudioFormatFlagsAudioUnitCanonical /*matches AudioUnitSampleType*/ | kAudioFormatFlagIsNonInterleaved,
.mBytesPerPacket = sizeof(AudioUnitSampleType),
.mFramesPerPacket = 1,
.mBytesPerFrame = sizeof(AudioUnitSampleType) * session.inputNumberOfChannels,
.mChannelsPerFrame = session.inputNumberOfChannels,
.mBitsPerChannel = 8 * sizeof(AudioUnitSampleType),
.mReserved = 0,
};
err = AudioUnitSetProperty(unit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, kOutputElement, &streamDesc, sizeof(streamDesc));
if (err != noErr) NSLog(@"Error configuring input stream format for audio unit: %ld", err);
AURenderCallbackStruct callbacks = {
.inputProc = renderCallback,
.inputProcRefCon = unit
};
err = AudioUnitSetProperty(unit, kAudioOutputUnitProperty_SetInputCallback, kAudioUnitScope_Input, kOutputElement, &callbacks, sizeof(callbacks));
if (err != noErr) NSLog(@"Error configuring input callbacks for audio unit: %ld", err);
err = AudioUnitInitialize(unit);
if (err != noErr) NSLog(@"Error initializing audio unit: %ld", err);
err = AudioOutputUnitStart(unit);
if (err != noErr) NSLog(@"Error starting audio unit: %ld", err);
// err = AudioComponentInstanceDispose(unit);
// if (err != noErr) NSLog(@"Error disposing audio unit: %ld", err);
}
它在模拟器中工作(或至少不会崩溃),但我在iPhone 5上运行时得到以下输出:
Session activated. sample rate 44100.000000
Number of channels 1
15:48:45.170 <com.apple.main-thread> shm_open failed: "AppleAURemoteIO.o.262da" (23) flags=0x2 errno=2
15:48:45.172 <com.apple.main-thread> AURemoteIO::ChangeHardwareFormats: error 3
15:48:45.333 <com.apple.main-thread> shm_open failed: "AppleAURemoteIO.o.262da" (23) flags=0x2 errno=2
15:48:45.336 <com.apple.main-thread> AURemoteIO::ChangeHardwareFormats: error 3
15:48:45.497 <com.apple.main-thread> shm_open failed: "AppleAURemoteIO.o.262da" (23) flags=0x2 errno=2
15:48:45.499 <com.apple.main-thread> AURemoteIO::ChangeHardwareFormats: error 3
15:48:45.669 <com.apple.main-thread> shm_open failed: "AppleAURemoteIO.o.262da" (23) flags=0x2 errno=2
15:48:45.671 <com.apple.main-thread> AURemoteIO::ChangeHardwareFormats: error 3
15:48:45.839 <com.apple.main-thread> shm_open failed: "AppleAURemoteIO.o.262da" (23) flags=0x2 errno=2
15:48:45.841 <com.apple.main-thread> AURemoteIO::ChangeHardwareFormats: error 3
Error initializing audio unit: 3
会话已激活。采样率44100.000000
频道数量1
15:48:45.170 shm_打开失败:“AppleAURemoteIO.o.262da”(23)标志=0x2错误号=2
15:48:45.172 AURemoteIO::ChangeHardwareFormats:错误3
15:48:45.333 shm_打开失败:“AppleAURemoteIO.o.262da”(23)标志=0x2错误号=2
15:48:45.336 AURemoteIO::ChangeHardwareFormats:错误3
15:48:45.497 shm_打开失败:“AppleAURemoteIO.o.262da”(23)标志=0x2错误号=2
15:48:45.499 AURemoteIO::ChangeHardwareFormats:错误3
15:48:45.669 shm_打开失败:“AppleAURemoteIO.o.262da”(23)标志=0x2错误号=2
15:48:45.671 AURemoteIO::ChangeHardwareFormats:错误3
15:48:45.839 shm_打开失败:“AppleAURemoteIO.o.262da”(23)标志=0x2错误号=2
15:48:45.841 AURemoteIO::ChangeHardwareFormats:错误3
初始化音频单元时出错:3
事实证明,当使用AVAudioSessionCategoryRecord
(或相当于C API中的kAudioSessionCategory\U RecordAudio
)时,还必须禁用音频单元上的输出:
...
// Disable output
err = AudioUnitSetProperty(unit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Output, kOutputElement, &disableFlag, sizeof(disableFlag));
if (err != noErr) NSLog(@"Error disabling output for audio unit: %ld", err);
我也有同样的错误,但在Play和Record会话中。。。