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BC
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libvpx
Commits
c09d8c14
Commit
c09d8c14
authored
13 years ago
by
John Koleszar
Committed by
Code Review
13 years ago
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Merge "Fix documentation typos"
parents
a66d8d33
8942f70c
v1.14.0-linphone
1.4.X
cayuga
eider
experimental
feature/update_to_v1.9.0-linphone
feature/uwp_nuget
forest
frame_parallel
highbitdepth
indianrunnerduck
javanwhistlingduck
khakicampbell
linphone
linphone-android
linphone-old
longtailedduck
m29-baseline
m31-baseline
m49-2623
m52-2743
m54-2840
m56-2924
m66-3359
m68-3440
mandarinduck
mcw
mcw2
nextgen
nextgenv2
pcs-2013
playground
sandbox/Jingning/experimental
sandbox/Jingning/transcode
sandbox/Jingning/vpx
sandbox/aconverse@google.com/ansbench
sandbox/debargha/playground
sandbox/hkuang/frame_parallel
sandbox/hkuang@google.com/decode
sandbox/jimbankoski@google.com/proposed-aom
sandbox/jingning@google.com/decoder_test_suite
sandbox/jingning@google.com/experimental
sandbox/jkoleszar/cached-multibit
sandbox/jkoleszar/new-rate-control
sandbox/jkoleszar/new-rtcd
sandbox/jkoleszar/reuse-modemv
sandbox/jzern@google.com/test
sandbox/wangch@google.com/vp9
sandbox/yaowu@google.com/mergeaom
stable-vp9-decoder
v1.12.0-linphone
v1.6.1_linphone
v1.7.0-linphone
v1.9.0-linphone
vp9-preview
v1.9.0
v1.9.0-rc1
v1.8.2
v1.8.1
v1.8.0
v1.7.0
v1.6.1
v1.6.0
v1.5.0
v1.4.0
v1.3.0
v1.2.0
v1.1.0
v1.0.0
v0.9.7
v0.9.7-p1
No related merge requests found
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vp8/common/x86/idctllm_mmx.asm
+6
-6
vp8/common/x86/idctllm_mmx.asm
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and
6 deletions
vp8/common/x86/idctllm_mmx.asm
+
6
−
6
View file @
c09d8c14
...
@@ -14,18 +14,18 @@
...
@@ -14,18 +14,18 @@
; /****************************************************************************
; /****************************************************************************
; * Notes:
; * Notes:
; *
; *
; * This implementation makes use of 16 bit fixed point verio of two multiply
; * This implementation makes use of 16 bit fixed point ver
s
io
n
of two multiply
; * constants:
; * constants:
; * 1. sqrt(2) * cos (pi/8)
; * 1. sqrt(2) * cos (pi/8)
; *
2. sqrt(2) * sin (pi/8)
; * 2. sqrt(2) * sin (pi/8)
; * Bec
u
ase the first constant is bigger than 1, to maintain the same 16 bit
; * Beca
u
se the first constant is bigger than 1, to maintain the same 16 bit
; * fixed point pr
r
cision as the second one, we use a trick of
; * fixed point pr
e
cision as the second one, we use a trick of
; * x * a = x + x*(a-1)
; * x * a = x + x*(a-1)
; * so
; * so
; * x * sqrt(2) * cos (pi/8) = x + x * (sqrt(2) *cos(pi/8)-1).
; * x * sqrt(2) * cos (pi/8) = x + x * (sqrt(2) *cos(pi/8)-1).
; *
; *
; * For
the second constant, bec
u
ase of the 16bit version is 35468, which
; * For the second constant, beca
u
se of the 16bit version is 35468, which
; * is bigger than 32768, in signed 16 bit multiply, it become a negative
; * is bigger than 32768, in signed 16 bit multiply, it become
s
a negative
; * number.
; * number.
; * (x * (unsigned)35468 >> 16) = x * (signed)35468 >> 16 + x
; * (x * (unsigned)35468 >> 16) = x * (signed)35468 >> 16 + x
; *
; *
...
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