2014/10/15 下午 10:04:15

iphone Programming Glossary: audiounitrender

http://stackoverflow.com/questions/6930609/write-audio-to-disk-from-io-unit

stereoStreamFormat sizeof stereoStreamFormat static OSStatus masterChannelMixerUnitCallback void inRefCon AudioUnitRenderActionFlags ioActionFlags const AudioTimeStamp inTimeStamp UInt32 inBusNumber UInt32 inNumberFrames AudioBufferList.. const AudioTimeStamp inTimeStamp UInt32 inBusNumber UInt32 inNumberFrames AudioBufferList ioData ref.equnit AudioUnitRender engineDescribtion.channelMixers inBusNumber ioActionFlags inTimeStamp 0 inNumberFrames ioData Engine engine Engine inRefCon.. inBusNumber ioActionFlags inTimeStamp 0 inNumberFrames ioData Engine engine Engine inRefCon AudioUnitRender engineDescribtion.equnit ioActionFlags inTimeStamp 0 inNumberFrames ioData if engine isrecording ExtAudioFileWriteAsync..

FFT on iPhone to ignore background noise and find lower pitches

http://stackoverflow.com/questions/7181630/fft-on-iphone-to-ignore-background-noise-and-find-lower-pitches

the low E. The Pitch Detection code is located in RIOInterface.mm and goes something like this ... get the data AudioUnitRender ... convert int16 to float Convert ... divide the signal into even odd configuration vDSP_ctoz COMPLEX outputBuffer 2 A..

Can anybody help me in recording iPhone output sound through Audio Unit

http://stackoverflow.com/questions/8615358/can-anybody-help-me-in-recording-iphone-output-sound-through-audio-unit

initialize write buffers for audio file the recording call back static OSStatus recordingCallback void inRefCon AudioUnitRenderActionFlags ioActionFlags const AudioTimeStamp inTimeStamp UInt32 inBusNumber UInt32 inNumberFrames AudioBufferList.. UInt32 inBusNumber UInt32 inNumberFrames AudioBufferList ioData NSLog @ callback if ioActionFlags kAudioUnitRenderAction_PostRender inBusNumber 0 AudioBufferList bufferList Fill this up with buffers you will want to malloc it as it's.. rioUnit MixerHostAudio inRefCon getAudioUnit OSStatus status NSLog @ de5eal el call back BELOW I GET THE ERROR status AudioUnitRender rioUnit ioActionFlags inTimeStamp inBusNumber inNumberFrames bufferList if noErr status NSLog @ AudioUnitRender..