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What Shazam doesn't want you to know

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Roy van Rijn
Roy van Rijn

This is the presentation I gave at Devoxx 2011 called: "What Shazam doesn't want you to know"

TechnologieDivertissement et humour
1  sur  46
What Shazam doesn't want you to know ,[object Object]
[object Object]
[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
[object Object]
[object Object],[object Object]
Let it listen for +/- 20 seconds.
It tells you: ,[object Object],[object Object],[object Object]
[object Object]
[object Object],private AudioFormat getFormat() { float sampleRate = 44100; int sampleSizeInBits = 8; int channels = 1; boolean signed = true ; boolean bigEndian = true ; return new AudioFormat( sampleRate, sampleSizeInBits, channels, signed, bigEndian); } ,[object Object],[object Object],[object Object]
[object Object],final AudioFormat format = getFormat(); DataLine.Info info = new DataLine.Info(TargetDataLine. class , format); final TargetDataLine line = (TargetDataLine) AudioSystem. getLine (info); line.open(format); line.start(); ,[object Object],[object Object],[object Object]
[object Object],out = new ByteArrayOutputStream(); running = true ; try { while ( running ) { int count = line.read( buffer , 0, buffer . length ); if (count > 0) { out .write( buffer , 0, count); } } out .close(); } catch (IOException e) { throw new RuntimeException(e); } ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object]
[object Object]
The amount of cycles per second
i.e. one sine wave. ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object]
[object Object],byte audio[] = out .toByteArray(); final int amountSlices = audio. length / SLICE_SIZE ; Complex[][] results = new Complex[amountChucks][]; for ( int slice = 0;slice < amountSlices; slice++) { Complex[] complex = new Complex[ SLICE_SIZE ]; for ( int i = 0;i< SLICE_SIZE ;i++) { complex[i] = new Complex(audio[(slice* SLICE_SIZE )+i], 0); } results[slice] = FFT. fft (complex); } ,[object Object],[object Object],[object Object]
[object Object],Spectum Analyzer A spectrum analyzer or spectral analyzer is a device used to examine the spectral composition of some electrical, acoustic , or optical waveform. ,[object Object],[object Object],[object Object]
Demo: Aphex Twin
[object Object]
[object Object]
34 41 92 129 186
39 41 117 130 218
40 42 106 129 191
40 47 117 121 217
40 53 81 129 208
40 48 109 132 260
39 45 89 135 247
40 42 84 125 251
40 41 81 121 232
38 42 113 131 245 (etc...) ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object]
[object Object],public void harvest(File rootDirectory) { String[] itemsInDirectory = rootDirectory.list(); for (String itemInDirectory:itemsInDirectory) { if (itemInDirectory.endsWith( &quot;.mp3&quot; )) { //Assume mp3 file File mp3File = new File(mp3Directory, itemInDirectory); captureAudio(mp3File); } else if ( new File(mp3Directory, itemInDirectory).isDirectory()) { //Directory? Recurse! harvest( new File(mp3Directory, itemInDirectory)); } } } ,[object Object],[object Object],[object Object]
[object Object],[object Object]

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