[FFmpeg-cvslog] avcodec/sanm: remove codec4 block smoothing

[Manuel Lauss]

ffmpeg | branch: master | Manuel Lauss <manuel.lauss at gmail.com> | Tue Jun  3 12:31:01 2025 +0200| [c06439073651c4cd1a3d2deb778490655da55d11] | committer: Manuel Lauss

avcodec/sanm: remove codec4 block smoothing

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 at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c06439073651c4cd1a3d2deb778490655da55d11
---

 libavcodec/sanm.c | 19 -------------------
 1 file changed, 19 deletions(-)

diff --git a/libavcodec/sanm.c b/libavcodec/sanm.c
index 00bfef00fe..5912a8c14b 100644
--- a/libavcodec/sanm.c
+++ b/libavcodec/sanm.c
@@ -732,25 +732,6 @@ static int old_codec4(SANMVideoContext *ctx, GetByteContext *gb, int top, int le
                 }
                 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;