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a implementation of Shazam algorithm

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经过fft变换之后直接取实部的绝对值,并不是取复数模,计算振幅没有考虑到虚部 int freq = (outBuffer[k].real > 0) ? (int) outBuffer[k].real : (int) (0 - outBuffer[k].real); 看了下fft的结果数据,虚部值都比较小,可能影响不大,需要测试。