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swscale: aarch64: Fix yuv2rgb with negative strides 

Treat the 32 bit stride registers as signed.

Alternatively, we could make the stride arguments ptrdiff_t instead
of int, and changing all of the assembly to operate on these
registers with their full 64 bit width, but that's a much larger
and more intrusive change (and risks missing some operation, which
would clamp the intermediates to 32 bit still).

Fixes: https://trac.ffmpeg.org/ticket/9985

Signed-off-by: Martin Storsjö <martin@martin.st>
(cherry picked from commit cb803a0072)
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2022-10-25 13:13:34 +03:00
parent c655749d1d
commit 9c008fdbd4
1 changed files with 4 additions and 4 deletions
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8
libswscale/aarch64/yuv2rgb_neon.S
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@ -118,8 +118,8 @@
.endm
.macro increment_yuv422p
add x6, x6, w7, UXTW // srcU += incU
add x13, x13, w14, UXTW // srcV += incV
add x6, x6, w7, SXTW // srcU += incU
add x13, x13, w14, SXTW // srcV += incV
.endm
.macro compute_rgba r1 g1 b1 a1 r2 g2 b2 a2
@ -188,8 +188,8 @@ function ff_\ifmt\()_to_\ofmt\()_neon, export=1
st4 {v16.8B,v17.8B,v18.8B,v19.8B}, [x2], #32
subs w8, w8, #16 // width -= 16
b.gt 2b
add x2, x2, w3, UXTW // dst += padding
add x4, x4, w5, UXTW // srcY += paddingY
add x2, x2, w3, SXTW // dst += padding
add x4, x4, w5, SXTW // srcY += paddingY
increment_\ifmt
subs w1, w1, #1 // height -= 1
b.gt 1b