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javaandroidaudiorecordandroid-audiorecord

what order does AudioRecord class of Android store the audio samples in?

If I call the read() method, as 

record.read(lin, 0, R_fft);

where lin is a short array of size 256 and R_fft is 8, in what order does the read() function store the audio samples from MIC in? For instanc, is it 

lin[0] -> oldest sample  
.  
.  
lin[8] -> newest sample

or is it the other way round, that is 

lin[0] -> newest sample  
.  
.  
lin[8] -> oldest sample

or do the samples go towards the higher end of the lin[] array, that is towards, lin[248] to lin[255]?

Solution

  • The second argument to read() is an offset that specifies where in the array you want the samples to be stored. Since you're passing 0 you'll get the samples at the beginning of the array (i.e. at lin[0..7]).

    The oldest sample will be stored at the lowest address (lin[0]), and the latest sample at the highest address (lin[7]).