fix normalization
Originally committed as revision 3203 to svn://svn.ffmpeg.org/ffmpeg/trunk
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23854cadec
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2b647ac8c9
@ -545,7 +545,7 @@ static void component_resample(ImgReSampleContext *s,
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static void build_filter(int16_t *filter, float factor)
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{
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int ph, i, v;
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float x, y, tab[NB_TAPS], norm, mult;
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float x, y, tab[NB_TAPS], norm, mult, target;
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/* if upsampling, only need to interpolate, no filter */
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if (factor > 1.0)
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@ -571,10 +571,13 @@ static void build_filter(int16_t *filter, float factor)
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}
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/* normalize so that an uniform color remains the same */
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mult = (float)(1 << FILTER_BITS) / norm;
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target= 1 << FILTER_BITS;
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for(i=0;i<NB_TAPS;i++) {
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v = (int)(tab[i] * mult);
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mult = target / norm;
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v = lrintf(tab[i] * mult);
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filter[ph * NB_TAPS + i] = v;
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norm -= tab[i];
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target -= v;
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}
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}
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}
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