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/third_party/ffmpeg/libavcodec/
H A Damrwbdec.c920 static float auto_correlation(float *diff_isf, float mean, int lag) in auto_correlation() argument
926 float prod = (diff_isf[i] - mean) * (diff_isf[i - lag] - mean); in auto_correlation()
941 float diff_isf[LP_ORDER - 2], diff_mean; in extrapolate_isf() local
950 diff_isf[i] = isf[i + 1] - isf[i]; in extrapolate_isf()
954 diff_mean += diff_isf[i] * (1.0f / (LP_ORDER - 4)); in extrapolate_isf()
959 corr_lag[i] = auto_correlation(diff_isf, diff_mean, i + 2); in extrapolate_isf()
976 diff_isf[j] = scale * (isf[i] - isf[i - 1]); in extrapolate_isf()
980 if (diff_isf[i] + diff_isf[ in extrapolate_isf()
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