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avcodec/sanm: remove codec4 block smoothing

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it has a bug and its effects aren't that noticeable, esp. with
the smoothing applied to the whole picture by modern video display
engines.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
This commit is contained in:
Manuel Lauss
2025-06-03 12:31:01 +02:00
parent 834bedf312
commit c064390736
1 changed files with 0 additions and 19 deletions
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19
libavcodec/sanm.c
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@ -732,25 +732,6 @@ static int old_codec4(SANMVideoContext *ctx, GetByteContext *gb, int top, int le
} }
pxo2 = pxo2 - 4 + p; pxo2 = pxo2 - 4 + p;
} }
/* smooth top and left block borders with neighbours */
if (((pxoff - p + k) < 0) || ((pxoff - p + k) >= maxpxo)
|| ((pxoff + 3 * p) < 0) || ((pxoff + 3 * p) >= maxpxo)
|| (i == 0) || (j == 0))
continue;
if (param & 0x80) {
for (k = 0; k < 4; k++)
*(dst + pxoff + k) = ((*(dst + pxoff + k) + *(dst + pxoff - p + k)) >> 1) | 0x80;
*(dst + pxoff + 1 * p) = (*(dst + pxoff + 1 * p) + *(dst + pxoff + 1 * p - 1)) >> 1 | 0x80;
*(dst + pxoff + 2 * p) = (*(dst + pxoff + 2 * p) + *(dst + pxoff + 2 * p - 1)) >> 1 | 0x80;
*(dst + pxoff + 3 * p) = (*(dst + pxoff + 3 * p) + *(dst + pxoff + 3 * p - 1)) >> 1 | 0x80;
} else {
for (k = 0; k < 4; k++)
*(dst + pxoff + k) = ((*(dst + pxoff + k) + *(dst + pxoff - p + k)) >> 1) & 0x7f;
*(dst + pxoff + 1 * p) = (*(dst + pxoff + 1 * p) + *(dst + pxoff + 1 * p - 1)) >> 1;
*(dst + pxoff + 2 * p) = (*(dst + pxoff + 2 * p) + *(dst + pxoff + 2 * p - 1)) >> 1;
*(dst + pxoff + 3 * p) = (*(dst + pxoff + 3 * p) + *(dst + pxoff + 3 * p - 1)) >> 1;
}
} }
} }
return 0; return 0;