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video-chroma: do h subsampling after v subsampling

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We only need to do the horizontal subsampling on 1 line if we do it
after vertical subsampling and we also avoid doing vertical subsampling
on unused pixels.
This commit is contained in:
Wim Taymans 2014-11-06 09:28:06 +01:00
parent 6b1dcd2ec0
commit 3f44aaf810
1 changed files with 4 additions and 14 deletions
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18
gst-libs/gst/video/video-chroma.c
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@ -293,11 +293,6 @@ video_chroma_down_v2_##type (GstVideoChromaResample *resample, \
type *l0 = lines[0]; \
type *l1 = lines[1]; \
\
if (resample->h_resample) { \
resample->h_resample (resample, l0, width); \
if (l0 != l1) \
resample->h_resample (resample, l1, width); \
} \
if (l0 != l1) { \
for (i = 0; i < width; i++) { \
type tr0 = PR0(i), tr1 = PR1(i); \
@ -307,6 +302,8 @@ video_chroma_down_v2_##type (GstVideoChromaResample *resample, \
PB0(i) = FILT_1_1 (tb0, tb1); \
} \
} \
if (resample->h_resample) \
resample->h_resample (resample, l0, width); \
}
/* 2x vertical downsampling interlaced without cositing
*
@ -496,15 +493,6 @@ video_chroma_down_v4_##type (GstVideoChromaResample *resample, \
type *l2 = lines[2]; \
type *l3 = lines[3]; \
\
if (resample->h_resample) { \
resample->h_resample (resample, l0, width); \
if (l0 != l1) \
resample->h_resample (resample, l1, width); \
if (l1 != l2) \
resample->h_resample (resample, l2, width); \
if (l2 != l3) \
resample->h_resample (resample, l3, width); \
} \
for (i = 0; i < width; i++) { \
type tr0 = PR0(i), tr1 = PR1(i); \
type tr2 = PR2(i), tr3 = PR3(i); \
@ -514,6 +502,8 @@ video_chroma_down_v4_##type (GstVideoChromaResample *resample, \
PR0(i) = FILT_1_3_3_1 (tr0, tr1, tr2, tr3); \
PB0(i) = FILT_1_3_3_1 (tb0, tb1, tb2, tb3); \
} \
if (resample->h_resample) \
resample->h_resample (resample, l0, width); \
}
/* 4x vertical downsampling interlaced without cositing
*