[FFmpeg-cvslog] swscale/output: Bias 16bps output calculations to improve non overflowing range
Michael Niedermayer
git at videolan.org
Fri Apr 21 12:04:28 EEST 2023
ffmpeg | branch: release/4.2 | Michael Niedermayer <michael at niedermayer.cc> | Wed Nov 2 20:00:38 2022 +0100| [87df8385b83d7e61c94143483e747698ad0414a4] | committer: Michael Niedermayer
swscale/output: Bias 16bps output calculations to improve non overflowing range
Fixes: integer overflow
Fixes: ./ffmpeg -f rawvideo -video_size 66x64 -pixel_format yuva420p10le -i ~/videos/overflow_input_w66h64.yuva420p10le -filter_complex "scale=flags=bicubic+full_chroma_int+full_chroma_inp+bitexact+accurate_rnd:in_color_matrix=bt2020:out_color_matrix=bt2020:in_range=full:out_range=full,format=rgba64[out]" -pixel_format rgba64 -map '[out]' -y overflow_w66h64.png
Found-by: Drew Dunne <asdunne at google.com>
Tested-by: Drew Dunne <asdunne at google.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 0f0afc7fb5d30c40108d81b320823d8f5c9fbedc)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=87df8385b83d7e61c94143483e747698ad0414a4
---
libswscale/output.c | 120 ++++++++++++++++++++++++++--------------------------
1 file changed, 60 insertions(+), 60 deletions(-)
diff --git a/libswscale/output.c b/libswscale/output.c
index 3f507ee733..86d2cd51a1 100644
--- a/libswscale/output.c
+++ b/libswscale/output.c
@@ -1038,8 +1038,8 @@ yuv2rgba64_X_c_template(SwsContext *c, const int16_t *lumFilter,
Y2 -= c->yuv2rgb_y_offset;
Y1 *= c->yuv2rgb_y_coeff;
Y2 *= c->yuv2rgb_y_coeff;
- Y1 += 1 << 13; // 21
- Y2 += 1 << 13;
+ Y1 += (1 << 13) - (1 << 29); // 21
+ Y2 += (1 << 13) - (1 << 29);
// 8 bits: 17 + 13 bits = 30 bits, 16 bits: 17 + 13 bits = 30 bits
R = V * c->yuv2rgb_v2r_coeff;
@@ -1047,20 +1047,20 @@ yuv2rgba64_X_c_template(SwsContext *c, const int16_t *lumFilter,
B = U * c->yuv2rgb_u2b_coeff;
// 8 bits: 30 - 22 = 8 bits, 16 bits: 30 bits - 14 = 16 bits
- output_pixel(&dest[0], av_clip_uintp2(R_B + Y1, 30) >> 14);
- output_pixel(&dest[1], av_clip_uintp2( G + Y1, 30) >> 14);
- output_pixel(&dest[2], av_clip_uintp2(B_R + Y1, 30) >> 14);
+ output_pixel(&dest[0], av_clip_uintp2(((R_B + Y1) >> 14) + (1<<15), 16));
+ output_pixel(&dest[1], av_clip_uintp2((( G + Y1) >> 14) + (1<<15), 16));
+ output_pixel(&dest[2], av_clip_uintp2(((B_R + Y1) >> 14) + (1<<15), 16));
if (eightbytes) {
output_pixel(&dest[3], av_clip_uintp2(A1 , 30) >> 14);
- output_pixel(&dest[4], av_clip_uintp2(R_B + Y2, 30) >> 14);
- output_pixel(&dest[5], av_clip_uintp2( G + Y2, 30) >> 14);
- output_pixel(&dest[6], av_clip_uintp2(B_R + Y2, 30) >> 14);
+ output_pixel(&dest[4], av_clip_uintp2(((R_B + Y2) >> 14) + (1<<15), 16));
+ output_pixel(&dest[5], av_clip_uintp2((( G + Y2) >> 14) + (1<<15), 16));
+ output_pixel(&dest[6], av_clip_uintp2(((B_R + Y2) >> 14) + (1<<15), 16));
output_pixel(&dest[7], av_clip_uintp2(A2 , 30) >> 14);
dest += 8;
} else {
- output_pixel(&dest[3], av_clip_uintp2(R_B + Y2, 30) >> 14);
- output_pixel(&dest[4], av_clip_uintp2( G + Y2, 30) >> 14);
- output_pixel(&dest[5], av_clip_uintp2(B_R + Y2, 30) >> 14);
+ output_pixel(&dest[3], av_clip_uintp2(((R_B + Y2) >> 14) + (1<<15), 16));
+ output_pixel(&dest[4], av_clip_uintp2((( G + Y2) >> 14) + (1<<15), 16));
+ output_pixel(&dest[5], av_clip_uintp2(((B_R + Y2) >> 14) + (1<<15), 16));
dest += 6;
}
}
@@ -1097,8 +1097,8 @@ yuv2rgba64_2_c_template(SwsContext *c, const int32_t *buf[2],
Y2 -= c->yuv2rgb_y_offset;
Y1 *= c->yuv2rgb_y_coeff;
Y2 *= c->yuv2rgb_y_coeff;
- Y1 += 1 << 13;
- Y2 += 1 << 13;
+ Y1 += (1 << 13) - (1 << 29);
+ Y2 += (1 << 13) - (1 << 29);
R = V * c->yuv2rgb_v2r_coeff;
G = V * c->yuv2rgb_v2g_coeff + U * c->yuv2rgb_u2g_coeff;
@@ -1112,20 +1112,20 @@ yuv2rgba64_2_c_template(SwsContext *c, const int32_t *buf[2],
A2 += 1 << 13;
}
- output_pixel(&dest[0], av_clip_uintp2(R_B + Y1, 30) >> 14);
- output_pixel(&dest[1], av_clip_uintp2( G + Y1, 30) >> 14);
- output_pixel(&dest[2], av_clip_uintp2(B_R + Y1, 30) >> 14);
+ output_pixel(&dest[0], av_clip_uintp2(((R_B + Y1) >> 14) + (1<<15), 16));
+ output_pixel(&dest[1], av_clip_uintp2((( G + Y1) >> 14) + (1<<15), 16));
+ output_pixel(&dest[2], av_clip_uintp2(((B_R + Y1) >> 14) + (1<<15), 16));
if (eightbytes) {
output_pixel(&dest[3], av_clip_uintp2(A1 , 30) >> 14);
- output_pixel(&dest[4], av_clip_uintp2(R_B + Y2, 30) >> 14);
- output_pixel(&dest[5], av_clip_uintp2( G + Y2, 30) >> 14);
- output_pixel(&dest[6], av_clip_uintp2(B_R + Y2, 30) >> 14);
+ output_pixel(&dest[4], av_clip_uintp2(((R_B + Y2) >> 14) + (1<<15), 16));
+ output_pixel(&dest[5], av_clip_uintp2((( G + Y2) >> 14) + (1<<15), 16));
+ output_pixel(&dest[6], av_clip_uintp2(((B_R + Y2) >> 14) + (1<<15), 16));
output_pixel(&dest[7], av_clip_uintp2(A2 , 30) >> 14);
dest += 8;
} else {
- output_pixel(&dest[3], av_clip_uintp2(R_B + Y2, 30) >> 14);
- output_pixel(&dest[4], av_clip_uintp2( G + Y2, 30) >> 14);
- output_pixel(&dest[5], av_clip_uintp2(B_R + Y2, 30) >> 14);
+ output_pixel(&dest[3], av_clip_uintp2(((R_B + Y2) >> 14) + (1<<15), 16));
+ output_pixel(&dest[4], av_clip_uintp2((( G + Y2) >> 14) + (1<<15), 16));
+ output_pixel(&dest[5], av_clip_uintp2(((B_R + Y2) >> 14) + (1<<15), 16));
dest += 6;
}
}
@@ -1153,8 +1153,8 @@ yuv2rgba64_1_c_template(SwsContext *c, const int32_t *buf0,
Y2 -= c->yuv2rgb_y_offset;
Y1 *= c->yuv2rgb_y_coeff;
Y2 *= c->yuv2rgb_y_coeff;
- Y1 += 1 << 13;
- Y2 += 1 << 13;
+ Y1 += (1 << 13) - (1 << 29);
+ Y2 += (1 << 13) - (1 << 29);
if (hasAlpha) {
A1 = abuf0[i * 2 ] << 11;
@@ -1168,20 +1168,20 @@ yuv2rgba64_1_c_template(SwsContext *c, const int32_t *buf0,
G = V * c->yuv2rgb_v2g_coeff + U * c->yuv2rgb_u2g_coeff;
B = U * c->yuv2rgb_u2b_coeff;
- output_pixel(&dest[0], av_clip_uintp2(R_B + Y1, 30) >> 14);
- output_pixel(&dest[1], av_clip_uintp2( G + Y1, 30) >> 14);
- output_pixel(&dest[2], av_clip_uintp2(B_R + Y1, 30) >> 14);
+ output_pixel(&dest[0], av_clip_uintp2(((R_B + Y1) >> 14) + (1<<15), 16));
+ output_pixel(&dest[1], av_clip_uintp2((( G + Y1) >> 14) + (1<<15), 16));
+ output_pixel(&dest[2], av_clip_uintp2(((B_R + Y1) >> 14) + (1<<15), 16));
if (eightbytes) {
output_pixel(&dest[3], av_clip_uintp2(A1 , 30) >> 14);
- output_pixel(&dest[4], av_clip_uintp2(R_B + Y2, 30) >> 14);
- output_pixel(&dest[5], av_clip_uintp2( G + Y2, 30) >> 14);
- output_pixel(&dest[6], av_clip_uintp2(B_R + Y2, 30) >> 14);
+ output_pixel(&dest[4], av_clip_uintp2(((R_B + Y2) >> 14) + (1<<15), 16));
+ output_pixel(&dest[5], av_clip_uintp2((( G + Y2) >> 14) + (1<<15), 16));
+ output_pixel(&dest[6], av_clip_uintp2(((B_R + Y2) >> 14) + (1<<15), 16));
output_pixel(&dest[7], av_clip_uintp2(A2 , 30) >> 14);
dest += 8;
} else {
- output_pixel(&dest[3], av_clip_uintp2(R_B + Y2, 30) >> 14);
- output_pixel(&dest[4], av_clip_uintp2( G + Y2, 30) >> 14);
- output_pixel(&dest[5], av_clip_uintp2(B_R + Y2, 30) >> 14);
+ output_pixel(&dest[3], av_clip_uintp2(((R_B + Y2) >> 14) + (1<<15), 16));
+ output_pixel(&dest[4], av_clip_uintp2((( G + Y2) >> 14) + (1<<15), 16));
+ output_pixel(&dest[5], av_clip_uintp2(((B_R + Y2) >> 14) + (1<<15), 16));
dest += 6;
}
}
@@ -1199,8 +1199,8 @@ yuv2rgba64_1_c_template(SwsContext *c, const int32_t *buf0,
Y2 -= c->yuv2rgb_y_offset;
Y1 *= c->yuv2rgb_y_coeff;
Y2 *= c->yuv2rgb_y_coeff;
- Y1 += 1 << 13;
- Y2 += 1 << 13;
+ Y1 += (1 << 13) - (1 << 29);
+ Y2 += (1 << 13) - (1 << 29);
if (hasAlpha) {
A1 = abuf0[i * 2 ] << 11;
@@ -1214,20 +1214,20 @@ yuv2rgba64_1_c_template(SwsContext *c, const int32_t *buf0,
G = V * c->yuv2rgb_v2g_coeff + U * c->yuv2rgb_u2g_coeff;
B = U * c->yuv2rgb_u2b_coeff;
- output_pixel(&dest[0], av_clip_uintp2(R_B + Y1, 30) >> 14);
- output_pixel(&dest[1], av_clip_uintp2( G + Y1, 30) >> 14);
- output_pixel(&dest[2], av_clip_uintp2(B_R + Y1, 30) >> 14);
+ output_pixel(&dest[0], av_clip_uintp2(((R_B + Y1) >> 14) + (1<<15), 16));
+ output_pixel(&dest[1], av_clip_uintp2((( G + Y1) >> 14) + (1<<15), 16));
+ output_pixel(&dest[2], av_clip_uintp2(((B_R + Y1) >> 14) + (1<<15), 16));
if (eightbytes) {
output_pixel(&dest[3], av_clip_uintp2(A1 , 30) >> 14);
- output_pixel(&dest[4], av_clip_uintp2(R_B + Y2, 30) >> 14);
- output_pixel(&dest[5], av_clip_uintp2( G + Y2, 30) >> 14);
- output_pixel(&dest[6], av_clip_uintp2(B_R + Y2, 30) >> 14);
+ output_pixel(&dest[4], av_clip_uintp2(((R_B + Y2) >> 14) + (1<<15), 16));
+ output_pixel(&dest[5], av_clip_uintp2((( G + Y2) >> 14) + (1<<15), 16));
+ output_pixel(&dest[6], av_clip_uintp2(((B_R + Y2) >> 14) + (1<<15), 16));
output_pixel(&dest[7], av_clip_uintp2(A2 , 30) >> 14);
dest += 8;
} else {
- output_pixel(&dest[3], av_clip_uintp2(R_B + Y2, 30) >> 14);
- output_pixel(&dest[4], av_clip_uintp2( G + Y2, 30) >> 14);
- output_pixel(&dest[5], av_clip_uintp2(B_R + Y2, 30) >> 14);
+ output_pixel(&dest[3], av_clip_uintp2(((R_B + Y2) >> 14) + (1<<15), 16));
+ output_pixel(&dest[4], av_clip_uintp2((( G + Y2) >> 14) + (1<<15), 16));
+ output_pixel(&dest[5], av_clip_uintp2(((B_R + Y2) >> 14) + (1<<15), 16));
dest += 6;
}
}
@@ -1278,7 +1278,7 @@ yuv2rgba64_full_X_c_template(SwsContext *c, const int16_t *lumFilter,
// 8bit: 27 -> 17bit, 16bit: 31 - 14 = 17bit
Y -= c->yuv2rgb_y_offset;
Y *= c->yuv2rgb_y_coeff;
- Y += 1 << 13; // 21
+ Y += (1 << 13) - (1<<29); // 21
// 8bit: 17 + 13bit = 30bit, 16bit: 17 + 13bit = 30bit
R = V * c->yuv2rgb_v2r_coeff;
@@ -1286,9 +1286,9 @@ yuv2rgba64_full_X_c_template(SwsContext *c, const int16_t *lumFilter,
B = U * c->yuv2rgb_u2b_coeff;
// 8bit: 30 - 22 = 8bit, 16bit: 30bit - 14 = 16bit
- output_pixel(&dest[0], av_clip_uintp2(R_B + Y, 30) >> 14);
- output_pixel(&dest[1], av_clip_uintp2( G + Y, 30) >> 14);
- output_pixel(&dest[2], av_clip_uintp2(B_R + Y, 30) >> 14);
+ output_pixel(&dest[0], av_clip_uintp2(((R_B + Y)>>14) + (1<<15), 16));
+ output_pixel(&dest[1], av_clip_uintp2((( G + Y)>>14) + (1<<15), 16));
+ output_pixel(&dest[2], av_clip_uintp2(((B_R + Y)>>14) + (1<<15), 16));
if (eightbytes) {
output_pixel(&dest[3], av_clip_uintp2(A, 30) >> 14);
dest += 4;
@@ -1326,7 +1326,7 @@ yuv2rgba64_full_2_c_template(SwsContext *c, const int32_t *buf[2],
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;
@@ -1338,9 +1338,9 @@ yuv2rgba64_full_2_c_template(SwsContext *c, const int32_t *buf[2],
A += 1 << 13;
}
- output_pixel(&dest[0], av_clip_uintp2(R_B + Y, 30) >> 14);
- output_pixel(&dest[1], av_clip_uintp2( G + Y, 30) >> 14);
- output_pixel(&dest[2], av_clip_uintp2(B_R + Y, 30) >> 14);
+ output_pixel(&dest[0], av_clip_uintp2(((R_B + Y) >> 14) + (1<<15), 16));
+ output_pixel(&dest[1], av_clip_uintp2((( G + Y) >> 14) + (1<<15), 16));
+ output_pixel(&dest[2], av_clip_uintp2(((B_R + Y) >> 14) + (1<<15), 16));
if (eightbytes) {
output_pixel(&dest[3], av_clip_uintp2(A, 30) >> 14);
dest += 4;
@@ -1369,7 +1369,7 @@ yuv2rgba64_full_1_c_template(SwsContext *c, const int32_t *buf0,
Y -= c->yuv2rgb_y_offset;
Y *= c->yuv2rgb_y_coeff;
- Y += 1 << 13;
+ Y += (1 << 13) - (1 << 29);
if (hasAlpha) {
A = abuf0[i] << 11;
@@ -1381,9 +1381,9 @@ yuv2rgba64_full_1_c_template(SwsContext *c, const int32_t *buf0,
G = V * c->yuv2rgb_v2g_coeff + U * c->yuv2rgb_u2g_coeff;
B = U * c->yuv2rgb_u2b_coeff;
- output_pixel(&dest[0], av_clip_uintp2(R_B + Y, 30) >> 14);
- output_pixel(&dest[1], av_clip_uintp2( G + Y, 30) >> 14);
- output_pixel(&dest[2], av_clip_uintp2(B_R + Y, 30) >> 14);
+ output_pixel(&dest[0], av_clip_uintp2(((R_B + Y) >> 14) + (1<<15), 16));
+ output_pixel(&dest[1], av_clip_uintp2((( G + Y) >> 14) + (1<<15), 16));
+ output_pixel(&dest[2], av_clip_uintp2(((B_R + Y) >> 14) + (1<<15), 16));
if (eightbytes) {
output_pixel(&dest[3], av_clip_uintp2(A, 30) >> 14);
dest += 4;
@@ -1402,7 +1402,7 @@ yuv2rgba64_full_1_c_template(SwsContext *c, const int32_t *buf0,
Y -= c->yuv2rgb_y_offset;
Y *= c->yuv2rgb_y_coeff;
- Y += 1 << 13;
+ Y += (1 << 13) - (1 << 29);
if (hasAlpha) {
A = abuf0[i] << 11;
@@ -1414,9 +1414,9 @@ yuv2rgba64_full_1_c_template(SwsContext *c, const int32_t *buf0,
G = V * c->yuv2rgb_v2g_coeff + U * c->yuv2rgb_u2g_coeff;
B = U * c->yuv2rgb_u2b_coeff;
- output_pixel(&dest[0], av_clip_uintp2(R_B + Y, 30) >> 14);
- output_pixel(&dest[1], av_clip_uintp2( G + Y, 30) >> 14);
- output_pixel(&dest[2], av_clip_uintp2(B_R + Y, 30) >> 14);
+ output_pixel(&dest[0], av_clip_uintp2(((R_B + Y) >> 14) + (1<<15), 16));
+ output_pixel(&dest[1], av_clip_uintp2((( G + Y) >> 14) + (1<<15), 16));
+ output_pixel(&dest[2], av_clip_uintp2(((B_R + Y) >> 14) + (1<<15), 16));
if (eightbytes) {
output_pixel(&dest[3], av_clip_uintp2(A, 30) >> 14);
dest += 4;
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