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swscale: clip unscaled output intermediates.

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Fixes bug 240, as well as several integer overflows (visible as glitches)
in other scaling output routines, e.g. YUV422.
This commit is contained in:
Ronald S. Bultje 2012-03-06 14:35:24 -08:00
parent a93b572ae4
commit 9487fb4dea
1 changed files with 36 additions and 0 deletions
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36
libswscale/output.c
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@ -511,6 +511,11 @@ yuv2422_2_c_template(SwsContext *c, const int16_t *buf[2],
int U = (ubuf0[i] * uvalpha1 + ubuf1[i] * uvalpha) >> 19;
int V = (vbuf0[i] * uvalpha1 + vbuf1[i] * uvalpha) >> 19;
Y1 = av_clip_uint8(Y1);
Y2 = av_clip_uint8(Y2);
U = av_clip_uint8(U);
V = av_clip_uint8(V);
output_pixels(i * 4, Y1, U, Y2, V);
}
}
@ -531,6 +536,11 @@ yuv2422_1_c_template(SwsContext *c, const int16_t *buf0,
int U = ubuf0[i] >> 7;
int V = vbuf0[i] >> 7;
Y1 = av_clip_uint8(Y1);
Y2 = av_clip_uint8(Y2);
U = av_clip_uint8(U);
V = av_clip_uint8(V);
output_pixels(i * 4, Y1, U, Y2, V);
}
} else {
@ -541,6 +551,11 @@ yuv2422_1_c_template(SwsContext *c, const int16_t *buf0,
int U = (ubuf0[i] + ubuf1[i]) >> 8;
int V = (vbuf0[i] + vbuf1[i]) >> 8;
Y1 = av_clip_uint8(Y1);
Y2 = av_clip_uint8(Y2);
U = av_clip_uint8(U);
V = av_clip_uint8(V);
output_pixels(i * 4, Y1, U, Y2, V);
}
}
@ -990,9 +1005,16 @@ yuv2rgb_2_c_template(SwsContext *c, const int16_t *buf[2],
*g = (c->table_gU[U] + c->table_gV[V]),
*b = c->table_bU[U];
Y1 = av_clip_uint8(Y1);
Y2 = av_clip_uint8(Y2);
U = av_clip_uint8(U);
V = av_clip_uint8(V);
if (hasAlpha) {
A1 = (abuf0[i * 2 ] * yalpha1 + abuf1[i * 2 ] * yalpha) >> 19;
A2 = (abuf0[i * 2 + 1] * yalpha1 + abuf1[i * 2 + 1] * yalpha) >> 19;
A1 = av_clip_uint8(A1);
A2 = av_clip_uint8(A2);
}
yuv2rgb_write(dest, i, Y1, Y2, hasAlpha ? A1 : 0, hasAlpha ? A2 : 0,
@ -1021,9 +1043,16 @@ yuv2rgb_1_c_template(SwsContext *c, const int16_t *buf0,
*g = (c->table_gU[U] + c->table_gV[V]),
*b = c->table_bU[U];
Y1 = av_clip_uint8(Y1);
Y2 = av_clip_uint8(Y2);
U = av_clip_uint8(U);
V = av_clip_uint8(V);
if (hasAlpha) {
A1 = abuf0[i * 2 ] >> 7;
A2 = abuf0[i * 2 + 1] >> 7;
A1 = av_clip_uint8(A1);
A2 = av_clip_uint8(A2);
}
yuv2rgb_write(dest, i, Y1, Y2, hasAlpha ? A1 : 0, hasAlpha ? A2 : 0,
@ -1041,9 +1070,16 @@ yuv2rgb_1_c_template(SwsContext *c, const int16_t *buf0,
*g = (c->table_gU[U] + c->table_gV[V]),
*b = c->table_bU[U];
Y1 = av_clip_uint8(Y1);
Y2 = av_clip_uint8(Y2);
U = av_clip_uint8(U);
V = av_clip_uint8(V);
if (hasAlpha) {
A1 = abuf0[i * 2 ] >> 7;
A2 = abuf0[i * 2 + 1] >> 7;
A1 = av_clip_uint8(A1);
A2 = av_clip_uint8(A2);
}
yuv2rgb_write(dest, i, Y1, Y2, hasAlpha ? A1 : 0, hasAlpha ? A2 : 0,