我有这段代码,为了读取缓冲区样本,但我得到了一个奇怪的mach-o链接器错误, 音频单元的框架couldnt加载,所以我把audioTollBox和coreAudio作为我读。 我的代码是:音频错误单元代码-remoteIO iphone
#define kOutputBus 0
#define kInputBus 1
AudioComponentInstance audioUnit;
@implementation remoteIO
//callback function :
static OSStatus recordingCallback(void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp *inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumberFrames,
AudioBufferList *ioData)
{
AudioBuffer buffer;
buffer.mNumberChannels = 1;
buffer.mDataByteSize = inNumberFrames * 2;
NSLog(@"%ld",inNumberFrames);
buffer.mData = malloc(inNumberFrames * 2);
AudioBufferList bufferList;
bufferList.mNumberBuffers = 1;
bufferList.mBuffers[0] = buffer;
OSStatus status;
status = AudioUnitRender(audioUnit,
ioActionFlags,
inTimeStamp,
inBusNumber,
inNumberFrames,
&bufferList);
checkStatus(status); //here is the warnning+error
double *q = (double *)(&bufferList)->mBuffers[0].mData;
for(int i=0; i < strlen((const char *)(&bufferList)->mBuffers[0].mData); i++)
{
NSLog(@"%f",q[i]);
}
}
和阅读方法:
-(void)startListeningWithFrequency:(float)freq;
{
OSStatus status;
AudioComponentDescription desc;
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = kAudioUnitSubType_RemoteIO;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
AudioComponent inputComponent = AudioComponentFindNext(NULL, &desc);
status = AudioComponentInstanceNew(inputComponent, &audioUnit);
checkStatus(status);
UInt32 flag = 1;
status = AudioUnitSetProperty(audioUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Input,kInputBus, &flag, sizeof(flag));
checkStatus(status);
AudioStreamBasicDescription audioFormat;
audioFormat.mSampleRate = 44100.00;//44100.00;
audioFormat.mFormatID = kAudioFormatLinearPCM;
audioFormat.mFormatFlags = kAudioFormatFlagIsSignedInteger | kAudioFormatFlagIsPacked;
audioFormat.mFramesPerPacket = 1;
audioFormat.mChannelsPerFrame = 1;
audioFormat.mBitsPerChannel = 16;
audioFormat.mBytesPerPacket = 2;
audioFormat.mBytesPerFrame = 2;
status = AudioUnitSetProperty(audioUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Output,
kInputBus,
&audioFormat,
sizeof(audioFormat));
checkStatus(status);
checkStatus(status);
AURenderCallbackStruct callbackStruct;
callbackStruct.inputProc = recordingCallback;
callbackStruct.inputProcRefCon = self;
status = AudioUnitSetProperty(audioUnit,
kAudioOutputUnitProperty_SetInputCallback,
kAudioUnitScope_Global,
kInputBus, &callbackStruct, sizeof(callbackStruct));
checkStatus(status);
status = AudioOutputUnitStart(audioUnit);
}
和我所得到的是这样的错误,WARNNING:
Undefined symbols for architecture i386:
"_checkStatus", referenced from:
_recordingCallback in remoteIO.o
-[remoteIO startListeningWithFrequency:] in remoteIO.o
ld: symbol(s) not found for architecture i386
collect2: ld returned 1 exit status
什么错在这里,? 谢谢。
please ??? ???任何人 ?我从这个音频事情中失去了我的想法!我现在可以看到,当我拿出所有的CheckStatus(状态)行,我可以编译它。我在想什么?我已经把所有的框架,为什么他不能识别checkStatus的东西? – Curnelious 2012-01-02 12:29:38
我现在可以看到,checkStatus这个词在整个苹果文档中都没有提及,甚至一次。不止一次。在任何音频文件中,都没有这样的功能。并在每一个音频指南,每一个帖子在这里,无处不在,他们都使用这个checkStatus(状态)功能,这是他们没有宣布..我在这里失踪? – Curnelious 2012-01-02 12:58:10