[FFmpeg-cvslog] postproc/postprocess_template: fix handling of first row of dering_C

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Tue Apr 22 21:04:37 2025 +0200| [142eb90f07a43a1658d0b61c4ae447f76e88f66b] | committer: Michael Niedermayer

postproc/postprocess_template: fix handling of first row of dering_C

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=142eb90f07a43a1658d0b61c4ae447f76e88f66b
---

 libpostproc/postprocess_altivec_template.c |  5 ++++-
 libpostproc/postprocess_template.c         | 12 +++++++-----
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/libpostproc/postprocess_altivec_template.c b/libpostproc/postprocess_altivec_template.c
index 1fc7c65ee4..feddab5035 100644
--- a/libpostproc/postprocess_altivec_template.c
+++ b/libpostproc/postprocess_altivec_template.c
@@ -530,7 +530,7 @@ static inline void doVertDefFilter_altivec(uint8_t src[], int stride, PPContext
      STORE(5)
 }
 
-static inline void dering_altivec(uint8_t src[], int stride, PPContext *c, int leftborder, int rightborder) {
+static inline void dering_altivec(uint8_t src[], int stride, PPContext *c, int leftborder, int rightborder, int topborder) {
     const vector signed int vsint32_8 = vec_splat_s32(8);
     const vector unsigned int vuint32_4 = vec_splat_u32(4);
     const vector signed char neg1 = vec_splat_s8(-1);
@@ -577,6 +577,9 @@ static inline void dering_altivec(uint8_t src[], int stride, PPContext *c, int l
     const vector signed int zero = vec_splat_s32(0);
     vector unsigned char v_dt = vec_splat(vec_ld(0, dt), 0);
 
+    if (topborder)
+        return;
+
 #define LOAD_LINE(i)                                                  \
     const vector unsigned char perm##i =                              \
         vec_lvsl(i * stride, srcCopy);                                \
diff --git a/libpostproc/postprocess_template.c b/libpostproc/postprocess_template.c
index d2e7a642ff..0531e39477 100644
--- a/libpostproc/postprocess_template.c
+++ b/libpostproc/postprocess_template.c
@@ -831,9 +831,11 @@ static inline void RENAME(doVertDefFilter)(uint8_t src[], int stride, PPContext
 #endif //TEMPLATE_PP_ALTIVEC
 
 #if !TEMPLATE_PP_ALTIVEC
-static inline void RENAME(dering)(uint8_t src[], int stride, PPContext *c, int leftborder, int rightborder)
+static inline void RENAME(dering)(uint8_t src[], int stride, PPContext *c, int leftborder, int rightborder, int topborder)
 {
 #if TEMPLATE_PP_MMXEXT && HAVE_7REGS
+    if (topborder)
+        return;
     DECLARE_ALIGNED(8, uint64_t, tmp)[3];
     __asm__ volatile(
         "pxor %%mm6, %%mm6                      \n\t"
@@ -1043,7 +1045,8 @@ DERING_CORE((%0, %1, 8)       ,(%%FF_REGd, %1, 4),%%mm2,%%mm4,%%mm0,%%mm3,%%mm5,
 
     if (max - min < DERING_THRESHOLD) return;
 
-    for(y=0; y<10; y++){
+    s[0] = 0;
+    for(y=topborder; y<10; y++){
         int t = 0;
 
         if(!leftborder && src[stride*y + 0] > avg) t+= 1;
@@ -3209,8 +3212,7 @@ static void RENAME(postProcess)(const uint8_t src[], int srcStride, uint8_t dst[
                 }
 #endif //TEMPLATE_PP_MMX
                 if(mode & DERING){
-                //FIXME filter first line
-                    if(y>0) RENAME(dering)(dstBlock - stride - 8, stride, c, x<=8, 0);
+                    RENAME(dering)(dstBlock - stride - 8, stride, c, x<=8, 0, y<=0);
                 }
 
                 if(mode & TEMP_NOISE_FILTER)
@@ -3232,7 +3234,7 @@ static void RENAME(postProcess)(const uint8_t src[], int srcStride, uint8_t dst[
         }
 
         if(mode & DERING){
-            if(y > 0) RENAME(dering)(dstBlock - dstStride - 8, dstStride, c, 0, 1);
+            RENAME(dering)(dstBlock - dstStride - 8, dstStride, c, 0, 1, y<=0);
         }
 
         if((mode & TEMP_NOISE_FILTER)){