2014/10/15 下午 10:12:27

iphone Programming Glossary: packetcount

iPhone FFT with Accelerate framework vDSP

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

sizeof mASBD result AudioFileGetProperty mAudioFile kAudioFilePropertyDataFormat size mASBD UInt32 dataSize sizeof packetCount result AudioFileGetProperty mAudioFile kAudioFilePropertyAudioDataPacketCount dataSize packetCount NSLog NSString stringWithFormat.. dataSize sizeof packetCount result AudioFileGetProperty mAudioFile kAudioFilePropertyAudioDataPacketCount dataSize packetCount NSLog NSString stringWithFormat @ File Opened packet Count d packetCount UInt32 packetsRead packetCount UInt32 numBytesRead.. dataSize packetCount NSLog NSString stringWithFormat @ File Opened packet Count d packetCount UInt32 packetsRead packetCount UInt32 numBytesRead 1 if packetCount 0 allocate buffer audioData SInt16 malloc 2 packetCount..

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

_sampleRate _fileDataFormat.mSampleRate _totalReadBytes 0 AudioFramePacketTranslation tran .mFrame 0 .mPacket packetCount 1 .mFrameOffsetInPacket 0 tran.mFrame 0 tran.mFrameOffsetInPacket 0 tran.mPacket 1 UInt32 size sizeof tran theErr AudioFileGetProperty.. wantedPackets bound condition if packetOffset _totalPackets packetOffset _totalPackets UInt32 outBytes UInt32 packetCount wantedPackets int x packetCount _maxPacketSize void data void malloc x OSStatus theErr AudioFileReadPackets audioFile false.. if packetOffset _totalPackets packetOffset _totalPackets UInt32 outBytes UInt32 packetCount wantedPackets int x packetCount _maxPacketSize void data void malloc x OSStatus theErr AudioFileReadPackets audioFile false outBytes NULL _packetOffset..