From 832cb64af2b376671ca0876d0f7cc0a5db417d5a Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Tue, 15 Nov 2022 23:10:02 +0100 Subject: [PATCH] swscale/input: Use more unsigned intermediates 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 (cherry picked from commit ba209e3d5142fd31bb6c3e05c5b183118a278afc) Signed-off-by: Michael Niedermayer --- libswscale/input.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/libswscale/input.c b/libswscale/input.c index 3d365d54ac..3966d96d45 100644 --- a/libswscale/input.c +++ b/libswscale/input.c @@ -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; @@ -156,9 +156,9 @@ 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; @@ -178,12 +178,12 @@ 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;