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| author | Ronald S. Bultje <rsbultje@gmail.com> | 2012-07-24 21:23:12 +0000 |
|---|---|---|
| committer | Derek Buitenhuis <derek.buitenhuis@gmail.com> | 2012-07-25 14:37:03 -0400 |
| commit | 48098788c240f678222d45db79aff38f494f3df5 (patch) | |
| tree | b8cab6dcb14be3d65dcd846ba0c267f9eef8fa38 /libavcodec/vp8.c | |
| parent | a1878a88a1dc3e3b0abaee910a18f0a6a30b0805 (diff) | |
| download | ffmpeg-48098788c240f678222d45db79aff38f494f3df5.tar.gz | |
vp8: Replace x*155/100 by x*101581>>16.
Idea stolen from webp (by Pascal Massimino) - because it's Cool.
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Diffstat (limited to 'libavcodec/vp8.c')
| -rw-r--r-- | libavcodec/vp8.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c index d0e2a0cccb..a662f8a2df 100644 --- a/libavcodec/vp8.c +++ b/libavcodec/vp8.c @@ -249,12 +249,13 @@ static void get_quants(VP8Context *s) } else base_qi = yac_qi; - s->qmat[i].luma_qmul[0] = vp8_dc_qlookup[av_clip_uintp2(base_qi + ydc_delta , 7)]; - s->qmat[i].luma_qmul[1] = vp8_ac_qlookup[av_clip_uintp2(base_qi , 7)]; - s->qmat[i].luma_dc_qmul[0] = 2 * vp8_dc_qlookup[av_clip_uintp2(base_qi + y2dc_delta, 7)]; - s->qmat[i].luma_dc_qmul[1] = 155 * vp8_ac_qlookup[av_clip_uintp2(base_qi + y2ac_delta, 7)] / 100; - s->qmat[i].chroma_qmul[0] = vp8_dc_qlookup[av_clip_uintp2(base_qi + uvdc_delta, 7)]; - s->qmat[i].chroma_qmul[1] = vp8_ac_qlookup[av_clip_uintp2(base_qi + uvac_delta, 7)]; + s->qmat[i].luma_qmul[0] = vp8_dc_qlookup[av_clip_uintp2(base_qi + ydc_delta , 7)]; + s->qmat[i].luma_qmul[1] = vp8_ac_qlookup[av_clip_uintp2(base_qi , 7)]; + s->qmat[i].luma_dc_qmul[0] = 2 * vp8_dc_qlookup[av_clip_uintp2(base_qi + y2dc_delta, 7)]; + /* 101581>>16 is equivalent to 155/100 */ + s->qmat[i].luma_dc_qmul[1] = (101581 * vp8_ac_qlookup[av_clip_uintp2(base_qi + y2ac_delta, 7)]) >> 16; + s->qmat[i].chroma_qmul[0] = vp8_dc_qlookup[av_clip_uintp2(base_qi + uvdc_delta, 7)]; + s->qmat[i].chroma_qmul[1] = vp8_ac_qlookup[av_clip_uintp2(base_qi + uvac_delta, 7)]; s->qmat[i].luma_dc_qmul[1] = FFMAX(s->qmat[i].luma_dc_qmul[1], 8); s->qmat[i].chroma_qmul[0] = FFMIN(s->qmat[i].chroma_qmul[0], 132); |