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swscale/input: Use more unsigned intermediates

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Same principle as previous commit, with sufficiently huge rgb2yuv table
values this produces wrong results and undefined behavior.
The unsigned produces the same incorrect results. That is probably
ok as these cases with huge values seem not to occur in any real
use case.

Fixes: signed integer overflow
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2022-11-15 23:10:02 +01:00
parent ce566281f9
commit ba209e3d51
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GPG Key ID: B18E8928B3948D64
1 changed files with 12 additions and 12 deletions
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24
libswscale/input.c
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@ -84,9 +84,9 @@ rgb64ToUV_half_c_template(uint16_t *dstU, uint16_t *dstV,
int32_t rv = rgb2yuv[RV_IDX], gv = rgb2yuv[GV_IDX], bv = rgb2yuv[BV_IDX];
av_assert1(src1==src2);
for (i = 0; i < width; i++) {
int r_b = (input_pixel(&src1[8 * i + 0]) + input_pixel(&src1[8 * i + 4]) + 1) >> 1;
int g = (input_pixel(&src1[8 * i + 1]) + input_pixel(&src1[8 * i + 5]) + 1) >> 1;
int b_r = (input_pixel(&src1[8 * i + 2]) + input_pixel(&src1[8 * i + 6]) + 1) >> 1;
unsigned r_b = (input_pixel(&src1[8 * i + 0]) + input_pixel(&src1[8 * i + 4]) + 1) >> 1;
unsigned g = (input_pixel(&src1[8 * i + 1]) + input_pixel(&src1[8 * i + 5]) + 1) >> 1;
unsigned b_r = (input_pixel(&src1[8 * i + 2]) + input_pixel(&src1[8 * i + 6]) + 1) >> 1;
dstU[i]= (ru*r + gu*g + bu*b + (0x10001<<(RGB2YUV_SHIFT-1))) >> RGB2YUV_SHIFT;
dstV[i]= (rv*r + gv*g + bv*b + (0x10001<<(RGB2YUV_SHIFT-1))) >> RGB2YUV_SHIFT;
@ -158,9 +158,9 @@ static av_always_inline void rgb48ToUV_c_template(uint16_t *dstU,
int32_t rv = rgb2yuv[RV_IDX], gv = rgb2yuv[GV_IDX], bv = rgb2yuv[BV_IDX];
av_assert1(src1 == src2);
for (i = 0; i < width; i++) {
int r_b = input_pixel(&src1[i * 3 + 0]);
int g = input_pixel(&src1[i * 3 + 1]);
int b_r = input_pixel(&src1[i * 3 + 2]);
unsigned r_b = input_pixel(&src1[i * 3 + 0]);
unsigned g = input_pixel(&src1[i * 3 + 1]);
unsigned b_r = input_pixel(&src1[i * 3 + 2]);
dstU[i] = (ru*r + gu*g + bu*b + (0x10001 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT;
dstV[i] = (rv*r + gv*g + bv*b + (0x10001 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT;
@ -180,12 +180,12 @@ static av_always_inline void rgb48ToUV_half_c_template(uint16_t *dstU,
int32_t rv = rgb2yuv[RV_IDX], gv = rgb2yuv[GV_IDX], bv = rgb2yuv[BV_IDX];
av_assert1(src1 == src2);
for (i = 0; i < width; i++) {
int r_b = (input_pixel(&src1[6 * i + 0]) +
input_pixel(&src1[6 * i + 3]) + 1) >> 1;
int g = (input_pixel(&src1[6 * i + 1]) +
input_pixel(&src1[6 * i + 4]) + 1) >> 1;
int b_r = (input_pixel(&src1[6 * i + 2]) +
input_pixel(&src1[6 * i + 5]) + 1) >> 1;
unsigned r_b = (input_pixel(&src1[6 * i + 0]) +
input_pixel(&src1[6 * i + 3]) + 1) >> 1;
unsigned g = (input_pixel(&src1[6 * i + 1]) +
input_pixel(&src1[6 * i + 4]) + 1) >> 1;
unsigned b_r = (input_pixel(&src1[6 * i + 2]) +
input_pixel(&src1[6 * i + 5]) + 1) >> 1;
dstU[i] = (ru*r + gu*g + bu*b + (0x10001 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT;
dstV[i] = (rv*r + gv*g + bv*b + (0x10001 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT;