2014/10/15 下午 10:04:12

iphone Programming Glossary: audiofileopenurl

http://stackoverflow.com/questions/1246637/iphone-get-duration-of-an-audio-file

give you the estimated duration. Code NSURL afUrl NSURL fileURLWithPath soundPath AudioFileID fileID OSStatus result AudioFileOpenURL CFURLRef afUrl kAudioFileReadPermission 0 fileID UInt64 outDataSize 0 UInt32 thePropSize sizeof UInt64 result AudioFileGetProperty..

Audio Processing: Playing with volume level

http://stackoverflow.com/questions/3982723/audio-processing-playing-with-volume-level

talking about normalization but I've no idea about normalization. AudioFileID inFileID CFURLRef inURL self inSoundURL AudioFileOpenURL inURL kAudioFileReadPermission kAudioFileWAVEType inFileID UInt32 fileSize self audioFileSize inFileID Float32 inData malloc.. v. mono void ScaleAudioFileAmplitude NSURL theURL float ampScale OSStatus err noErr ExtAudioFileRef audiofile ExtAudioFileOpenURL CFURLRef theURL audiofile assert audiofile get some info about the file's format. AudioStreamBasicDescription fileFormat..

iPhone FFT with Accelerate framework vDSP

http://stackoverflow.com/questions/6358764/iphone-fft-with-accelerate-framework-vdsp

is to check for low frequency sounds. How would I do this OSStatus open CFURLRef inputURL OSStatus result 1 result AudioFileOpenURL inputURL kAudioFileReadPermission 0 mAudioFile if result noErr get format info UInt32 size sizeof mASBD result AudioFileGetProperty..

How to reverse an audio file?

http://stackoverflow.com/questions/6593118/how-to-reverse-an-audio-file

UInt64 fileDataSize 0 AudioStreamBasicDescription theFileFormat UInt32 thePropertySize sizeof theFileFormat theErr AudioFileOpenURL __bridge CFURLRef self.recordedAudioUrl kAudioFileReadPermission 0 inputAudioFile thePropertySize sizeof fileDataSize theErr..

AudioQueue how to find out playback length of queued data

http://stackoverflow.com/questions/7375309/audioqueue-how-to-find-out-playback-length-of-queued-data

_ism4a TRUE firstTime TRUE _packetOffset 0 AudioFileTypeID hint MusicChunker hintForFileExtension ext OSStatus theErr AudioFileOpenURL CFURLRef url kAudioFileReadPermission hint audioFile if theErr ReportAudioError theErr UInt32 thePropertySize sizeof theFileFormat..

AudioFileSetProperty returning 'kAudioFileUnsupportedPropertyError (pty?)'

http://stackoverflow.com/questions/8658386/audiofilesetproperty-returning-kaudiofileunsupportedpropertyerror-pty

pty ' I'm having difficulties writing a audio file's metadata AudioFileID fileID nil AudioFileOpenURL __bridge CFURLRef url kAudioFileReadWritePermission 0 fileID CFDictionaryRef piDict nil UInt32 piDataSize sizeof piDict..