2014/10/15 下午 10:09:09

iphone Programming Glossary: float64

http://stackoverflow.com/questions/5032775/drawing-waveform-with-avassetreader

f normalizeMax NSMutableData fullSongData NSMutableData alloc init reader startReading UInt64 totalBytes 0 Float64 totalLeft 0 Float64 totalRight 0 Float32 sampleTally 0 NSInteger samplesPerPixel sampleRate 50 while reader.status AVAssetReaderStatusReading.. NSMutableData fullSongData NSMutableData alloc init reader startReading UInt64 totalBytes 0 Float64 totalLeft 0 Float64 totalRight 0 Float32 sampleTally 0 NSInteger samplesPerPixel sampleRate 50 while reader.status AVAssetReaderStatusReading..

Check play state of AVPlayer

http://stackoverflow.com/questions/5655864/check-play-state-of-avplayer

queue usingBlock . Example is from Apple Assume a property @property retain id playerObserver Float64 durationSeconds CMTimeGetSeconds #An asset# duration CMTime firstThird CMTimeMakeWithSeconds durationSeconds 3.0 1 CMTime..

AVPlayer Video SeekToTime

http://stackoverflow.com/questions/6329706/avplayer-video-seektotime

YES void updateSlider self.seeker.maximumValue self durationInSeconds self.seeker.value self currentTimeInSeconds Float64 durationInSeconds Float64 dur CMTimeGetSeconds duration return dur Float64 currentTimeInSeconds Float64 dur CMTimeGetSeconds.. self.seeker.maximumValue self durationInSeconds self.seeker.value self currentTimeInSeconds Float64 durationInSeconds Float64 dur CMTimeGetSeconds duration return dur Float64 currentTimeInSeconds Float64 dur CMTimeGetSeconds self.player currentTime.. self currentTimeInSeconds Float64 durationInSeconds Float64 dur CMTimeGetSeconds duration return dur Float64 currentTimeInSeconds Float64 dur CMTimeGetSeconds self.player currentTime return dur And that's it there are two gotchas..

iPhone AVCaptureDeviceInput How to Set Quality of Audio Capture?

http://stackoverflow.com/questions/7796263/iphone-avcapturedeviceinput-how-to-set-quality-of-audio-capture

AudioToolbox Reference AudioSessionServicesReference Reference reference.html union OSStatus propertyResult char a 4 u Float64 F64sampleRate 8192.0 Float64 F64realSampleRate 0 UInt32 F64datasize 8 u.propertyResult AudioSessionSetProperty kAudioSessionProperty_PreferredHardwareSampleRate.. Reference reference.html union OSStatus propertyResult char a 4 u Float64 F64sampleRate 8192.0 Float64 F64realSampleRate 0 UInt32 F64datasize 8 u.propertyResult AudioSessionSetProperty kAudioSessionProperty_PreferredHardwareSampleRate..

ExtAudioFileWrite to m4a/aac failing on dual-core devices (ipad 2, iphone 4s)

http://stackoverflow.com/questions/8719865/extaudiofilewrite-to-m4a-aac-failing-on-dual-core-devices-ipad-2-iphone-4s

trace and no error code. Here is the code in question The data formats AudioStreamBasicDescription AUCanonicalASBD Float64 sampleRate UInt32 channel AudioStreamBasicDescription audioFormat audioFormat.mSampleRate sampleRate audioFormat.mFormatID..