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video-chroma: improve 4x downsampling coefficients

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This commit is contained in:
Wim Taymans 2014-10-06 15:17:42 +02:00
parent 0b4abc267e
commit e115e5059b
1 changed files with 7 additions and 7 deletions
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14
gst-libs/gst/video/video-chroma.c
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@ -105,7 +105,7 @@ struct _GstVideoChromaResample
#define PB3(i) (l3[3 + 4 * (i)])
#define FILT_1_1(a,b) ((a) + (b) + 1) >> 1
#define FILT_1_1_1_1(a,b,c,d) ((a) + (b) + (c) + (d) + 2) >> 2
#define FILT_1_3_3_1(a,b,c,d) ((a) + 3*(b) + 3*(c) + (d) + 4) >> 3
#define FILT_3_1(a,b) (3*(a) + (b) + 2) >> 2
#define FILT_1_3(a,b) ((a) + 3*(b) + 2) >> 2
@ -448,7 +448,7 @@ video_chroma_up_vi4_##type (GstVideoChromaResample *resample, \
/* 4x horizontal downsampling without cositing
*
* +------ (a + b + c + d + 2) >> 2
* +------ (a + 3*b + 3*c + d + 4) >> 3
* |
* v
* ---O-------O---
@ -467,8 +467,8 @@ video_chroma_down_h4_##type (GstVideoChromaResample *resample, \
type tr0 = PR(i), tr1 = PR(i+1), tr2 = PR(i+2), tr3 = PR(i+3); \
type tb0 = PB(i), tb1 = PB(i+1), tb2 = PB(i+2), tb3 = PB(i+3); \
\
PR(i) = FILT_1_1_1_1 (tr0, tr1, tr2, tr3); \
PB(i) = FILT_1_1_1_1 (tb0, tb1, tb2, tb3); \
PR(i) = FILT_1_3_3_1 (tr0, tr1, tr2, tr3); \
PB(i) = FILT_1_3_3_1 (tb0, tb1, tb2, tb3); \
} \
}
@ -476,7 +476,7 @@ video_chroma_down_h4_##type (GstVideoChromaResample *resample, \
*
* a x--x--x-
* b x--x--x-
* O O O <---- (a + b + c + d + 2) >> 2
* O O O <---- (a + 3*b + 3*c + d + 4) >> 4
* c x--x--x-
* d x--x--x-
* e x--x--x-
@ -511,8 +511,8 @@ video_chroma_down_v4_##type (GstVideoChromaResample *resample, \
type tb0 = PB0(i), tb1 = PB1(i); \
type tb2 = PB2(i), tb3 = PB3(i); \
\
PR0(i) = FILT_1_1_1_1 (tr0, tr1, tr2, tr3); \
PB0(i) = FILT_1_1_1_1 (tb0, tb1, tb2, tb3); \
PR0(i) = FILT_1_3_3_1 (tr0, tr1, tr2, tr3); \
PB0(i) = FILT_1_3_3_1 (tb0, tb1, tb2, tb3); \
} \
}
/* 4x vertical downsampling interlaced without cositing