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swscale/output: Bias 16bps output calculations to improve non overflowing range for GBRP16/GBRPF32 

Fixes: integer overflow
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-11-02 20:00:38 +01:00
parent 0f0afc7fb5
commit b74f89caae
No known key found for this signature in database
GPG Key ID: B18E8928B3948D64
2 changed files with 26 additions and 15 deletions
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25
libswscale/output.c
View File

@ -2372,18 +2372,15 @@ yuv2gbrp16_full_X_c(SwsContext *c, const int16_t *lumFilter,
Y -= c->yuv2rgb_y_offset;
Y *= c->yuv2rgb_y_coeff;
Y += 1 << 13;
Y += (1 << 13) - (1 << 29);
R = V * c->yuv2rgb_v2r_coeff;
G = V * c->yuv2rgb_v2g_coeff + U * c->yuv2rgb_u2g_coeff;
B = U * c->yuv2rgb_u2b_coeff;
R = av_clip_uintp2(Y + R, 30);
G = av_clip_uintp2(Y + G, 30);
B = av_clip_uintp2(Y + B, 30);
dest16[2][i] = av_clip_uintp2(((Y + R) >> 14) + (1<<15), 16);
dest16[0][i] = av_clip_uintp2(((Y + G) >> 14) + (1<<15), 16);
dest16[1][i] = av_clip_uintp2(((Y + B) >> 14) + (1<<15), 16);
dest16[0][i] = G >> 14;
dest16[1][i] = B >> 14;
dest16[2][i] = R >> 14;
if (hasAlpha)
dest16[3][i] = av_clip_uintp2(A, 30) >> 14;
}
@ -2448,18 +2445,18 @@ yuv2gbrpf32_full_X_c(SwsContext *c, const int16_t *lumFilter,
Y -= c->yuv2rgb_y_offset;
Y *= c->yuv2rgb_y_coeff;
Y += 1 << 13;
Y += (1 << 13) - (1 << 29);
R = V * c->yuv2rgb_v2r_coeff;
G = V * c->yuv2rgb_v2g_coeff + U * c->yuv2rgb_u2g_coeff;
B = U * c->yuv2rgb_u2b_coeff;
R = av_clip_uintp2(Y + R, 30);
G = av_clip_uintp2(Y + G, 30);
B = av_clip_uintp2(Y + B, 30);
R = av_clip_uintp2(((Y + R) >> 14) + (1<<15), 16);
G = av_clip_uintp2(((Y + G) >> 14) + (1<<15), 16);
B = av_clip_uintp2(((Y + B) >> 14) + (1<<15), 16);
dest32[0][i] = av_float2int(float_mult * (float)(G >> 14));
dest32[1][i] = av_float2int(float_mult * (float)(B >> 14));
dest32[2][i] = av_float2int(float_mult * (float)(R >> 14));
dest32[0][i] = av_float2int(float_mult * (float)G);
dest32[1][i] = av_float2int(float_mult * (float)B);
dest32[2][i] = av_float2int(float_mult * (float)R);
if (hasAlpha)
dest32[3][i] = av_float2int(float_mult * (float)(av_clip_uintp2(A, 30) >> 14));
}

16
libswscale/x86/output.asm
View File

@ -44,11 +44,13 @@ pd_yuv2gbrp_y_start: times 8 dd (1 << 9)
pd_yuv2gbrp_uv_start: times 8 dd ((1 << 9) - (128 << 19))
pd_yuv2gbrp_a_start: times 8 dd (1 << 18)
pd_yuv2gbrp16_offset: times 8 dd 0x10000 ;(1 << 16)
pd_yuv2gbrp16_round13: times 8 dd 0x02000 ;(1 << 13)
pd_yuv2gbrp16_round13: times 8 dd 0xE0002000 ;(1 << 13) - (1 << 29)
pd_yuv2gbrp16_a_offset: times 8 dd 0x20002000
pd_yuv2gbrp16_upper30: times 8 dd 0x3FFFFFFF ;(1<<30) - 1
pd_yuv2gbrp16_upper27: times 8 dd 0x07FFFFFF ;(1<<27) - 1
pd_yuv2gbrp16_upper16: times 8 dd 0x0000FFFF ;(1<<16) - 1
pd_yuv2gbrp16_upperC: times 8 dd 0xC0000000
pd_yuv2gbrp_debias: times 8 dd 0x00008000 ;(1 << 29 - 14)
pb_pack_shuffle8: db 0, 4, 8, 12, \
-1, -1, -1, -1, \
-1, -1, -1, -1, \
@ -883,14 +885,26 @@ cglobal yuv2%1_full_X, 12, 14, 16, ptr, lumFilter, lumSrcx, lumFilterSize, chrFi
paddd G, Y
paddd B, Y
%if DEPTH < 16
CLIPP2 R, 30
CLIPP2 G, 30
CLIPP2 B, 30
%endif
psrad R, RGB_SHIFT
psrad G, RGB_SHIFT
psrad B, RGB_SHIFT
%if DEPTH >= 16
paddd R, [pd_yuv2gbrp_debias]
paddd G, [pd_yuv2gbrp_debias]
paddd B, [pd_yuv2gbrp_debias]
CLIPP2 R, 16
CLIPP2 G, 16
CLIPP2 B, 16
%endif
%if FLOAT
cvtdq2ps R, R
cvtdq2ps G, G