avcodec/scpr: fix decoding of prev+top-topleft prediction in keyframes

Signed-off-by: Paul B Mahol <onemda@gmail.com>
7 years ago · 324954cf96
parent f9d3841ae6
commit 324954cf96
1 changed files with 3 additions and 3 deletions
--- a/libavcodec/scpr.c
+++ b/libavcodec/scpr.c
@ -446,13 +446,13 @@ static int decompress_i(AVCodecContext *avctx, uint32_t *dst, int linesize)
                }

                r = odst[(ly * linesize + lx) * 4] +
-                    odst[((y * linesize + x) + off - z) * 4 + 4] -
+                    odst[((y * linesize + x) + off) * 4 + 4] -
                    odst[((y * linesize + x) + off - z) * 4];
                g = odst[(ly * linesize + lx) * 4 + 1] +
-                    odst[((y * linesize + x) + off - z) * 4 + 5] -
+                    odst[((y * linesize + x) + off) * 4 + 5] -
                    odst[((y * linesize + x) + off - z) * 4 + 1];
                b = odst[(ly * linesize + lx) * 4 + 2] +
-                    odst[((y * linesize + x) + off - z) * 4 + 6] -
+                    odst[((y * linesize + x) + off) * 4 + 6] -
                    odst[((y * linesize + x) + off - z) * 4 + 2];
                clr = ((b & 0xFF) << 16) + ((g & 0xFF) << 8) + (r & 0xFF);
                dst[y * linesize + x] = clr;