Revision 98cfadd6 libavcodec/iirfilter.c
libavcodec/iirfilter.c  

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if (filt_mode == FF_FILTER_MODE_HIGHPASS) { 
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c>gain = ((1.0 + cos_w0) / 2.0) / a0; 
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x0 = ((1.0 + cos_w0)) / a0;


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x1 = ((1.0 + cos_w0) / 2.0) / a0;


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x0 = ((1.0 + cos_w0) / 2.0) / a0;


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x1 = ((1.0 + cos_w0)) / a0;


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} else { // FF_FILTER_MODE_LOWPASS 
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c>gain = ((1.0  cos_w0) / 2.0) / a0; 
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x0 = (1.0  cos_w0) / a0;


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x1 = ((1.0  cos_w0) / 2.0) / a0;


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x0 = ((1.0  cos_w0) / 2.0) / a0;


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x1 = (1.0  cos_w0) / a0;


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} 
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c>cy[0] = (2.0 * cos_w0) / a0;


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c>cy[1] = (1.0 + (sin_w0 / 2.0)) / a0;


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c>cy[0] = (1.0 + (sin_w0 / 2.0)) / a0;


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c>cy[1] = (2.0 * cos_w0) / a0;


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// divide by gain to make the x coeffs integers. 
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// during filtering, the delay state will include the gain multiplication 
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