2014/10/15 下午 10:04:12

iphone Programming Glossary: audiofileid

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

one property to get that should 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..

Audio Processing: Playing with volume level

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

involve disturbing noise. I think that's why Art is talking about normalization but I've no idea about normalization. AudioFileID inFileID CFURLRef inURL self inSoundURL AudioFileOpenURL inURL kAudioFileReadPermission kAudioFileWAVEType inFileID UInt32.. i outData i Float32 inData i ampScale AudioStreamBasicDescription outDataFormat 0 self audioDataFormat inFileID AudioFileID outFileID CFURLRef outURL self outSoundURL AudioFileCreateWithURL outURL kAudioFileWAVEType outDataFormat kAudioFileFlags_EraseFile.. kExtAudioFileProperty_FileDataFormat size fileFormat we'll need to know what type of file it is later when we write AudioFileID aFile size sizeof aFile err ExtAudioFileGetProperty audiofile kExtAudioFileProperty_AudioFile size aFile AudioFileTypeID..

How to reverse an audio file?

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

When you get to the start of the data you have reversed the data and playing will be reversed. set up output file AudioFileID outputAudioFile AudioStreamBasicDescription myPCMFormat myPCMFormat.mSampleRate 16000.00 myPCMFormat.mFormatID kAudioFormatLinearPCM.. self.flippedAudioUrl kAudioFileCAFType myPCMFormat kAudioFileFlags_EraseFile outputAudioFile set up input file AudioFileID inputAudioFile OSStatus theErr noErr UInt64 fileDataSize 0 AudioStreamBasicDescription theFileFormat UInt32 thePropertySize..

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

m4a files Header #import Foundation Foundation.h #import AudioToolbox AudioToolbox.h @interface MusicChunker NSObject AudioFileID audioFile int _sampleRate int _totalFrames UInt64 _framesPerPacket UInt64 _totalPackets UInt64 fileDataSize AudioFilePacketTableInfo..

AudioFileSetProperty returning 'kAudioFileUnsupportedPropertyError (pty?)'

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

returning 'kAudioFileUnsupportedPropertyError 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..