From 7e41f95dce6390f39a5134a25213828ed65fac6b Mon Sep 17 00:00:00 2001
From: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Date: Tue, 26 Jul 2022 06:21:26 +0200
Subject: avcodec/snow: Remove unused halfpel_plane

Committed in 5be3a818719d613e2f225cf1532fda01ba106b04 in
an unfinished state; never used or finished and always disabled.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/snow.c | 67 +------------------------------------------------------
 libavcodec/snow.h |  1 -
 2 files changed, 1 insertion(+), 67 deletions(-)

diff --git a/libavcodec/snow.c b/libavcodec/snow.c
index 293a0eb7d9..5e0033063d 100644
--- a/libavcodec/snow.c
+++ b/libavcodec/snow.c
@@ -359,7 +359,7 @@ void ff_snow_pred_block(SnowContext *s, uint8_t *dst, uint8_t *tmp, ptrdiff_t st
             }
         }
     }else{
-        uint8_t *src= s->last_picture[block->ref]->data[plane_index];
+        const uint8_t *src = s->last_picture[block->ref]->data[plane_index];
         const int scale= plane_index ?  (2*s->mv_scale)>>s->chroma_h_shift : 2*s->mv_scale;
         int mx= block->mx*scale;
         int my= block->my*scale;
@@ -587,72 +587,12 @@ int ff_snow_common_init_after_header(AVCodecContext *avctx) {
     return 0;
 }
 
-#define USE_HALFPEL_PLANE 0
-
-static int halfpel_interpol(SnowContext *s, uint8_t *halfpel[4][4], AVFrame *frame){
-    int p,x,y;
-
-    for(p=0; p < s->nb_planes; p++){
-        int is_chroma= !!p;
-        int w= is_chroma ? AV_CEIL_RSHIFT(s->avctx->width,  s->chroma_h_shift) : s->avctx->width;
-        int h= is_chroma ? AV_CEIL_RSHIFT(s->avctx->height, s->chroma_v_shift) : s->avctx->height;
-        int ls= frame->linesize[p];
-        uint8_t *src= frame->data[p];
-
-        halfpel[1][p] = av_malloc_array(ls, (h + 2 * EDGE_WIDTH));
-        halfpel[2][p] = av_malloc_array(ls, (h + 2 * EDGE_WIDTH));
-        halfpel[3][p] = av_malloc_array(ls, (h + 2 * EDGE_WIDTH));
-        if (!halfpel[1][p] || !halfpel[2][p] || !halfpel[3][p]) {
-            av_freep(&halfpel[1][p]);
-            av_freep(&halfpel[2][p]);
-            av_freep(&halfpel[3][p]);
-            return AVERROR(ENOMEM);
-        }
-        halfpel[1][p] += EDGE_WIDTH * (1 + ls);
-        halfpel[2][p] += EDGE_WIDTH * (1 + ls);
-        halfpel[3][p] += EDGE_WIDTH * (1 + ls);
-
-        halfpel[0][p]= src;
-        for(y=0; y<h; y++){
-            for(x=0; x<w; x++){
-                int i= y*ls + x;
-
-                halfpel[1][p][i]= (20*(src[i] + src[i+1]) - 5*(src[i-1] + src[i+2]) + (src[i-2] + src[i+3]) + 16 )>>5;
-            }
-        }
-        for(y=0; y<h; y++){
-            for(x=0; x<w; x++){
-                int i= y*ls + x;
-
-                halfpel[2][p][i]= (20*(src[i] + src[i+ls]) - 5*(src[i-ls] + src[i+2*ls]) + (src[i-2*ls] + src[i+3*ls]) + 16 )>>5;
-            }
-        }
-        src= halfpel[1][p];
-        for(y=0; y<h; y++){
-            for(x=0; x<w; x++){
-                int i= y*ls + x;
-
-                halfpel[3][p][i]= (20*(src[i] + src[i+ls]) - 5*(src[i-ls] + src[i+2*ls]) + (src[i-2*ls] + src[i+3*ls]) + 16 )>>5;
-            }
-        }
-
-//FIXME border!
-    }
-    return 0;
-}
-
 void ff_snow_release_buffer(AVCodecContext *avctx)
 {
     SnowContext *s = avctx->priv_data;
-    int i;
 
     if(s->last_picture[s->max_ref_frames-1]->data[0]){
         av_frame_unref(s->last_picture[s->max_ref_frames-1]);
-        for(i=0; i<9; i++)
-            if(s->halfpel_plane[s->max_ref_frames-1][1+i/3][i%3]) {
-                av_free(s->halfpel_plane[s->max_ref_frames-1][1+i/3][i%3] - EDGE_WIDTH*(1+s->current_picture->linesize[i%3]));
-                s->halfpel_plane[s->max_ref_frames-1][1+i/3][i%3] = NULL;
-            }
     }
 }
 
@@ -665,11 +605,6 @@ int ff_snow_frame_start(SnowContext *s){
     tmp= s->last_picture[s->max_ref_frames-1];
     for(i=s->max_ref_frames-1; i>0; i--)
         s->last_picture[i] = s->last_picture[i-1];
-    memmove(s->halfpel_plane+1, s->halfpel_plane, (s->max_ref_frames-1)*sizeof(void*)*4*4);
-    if(USE_HALFPEL_PLANE && s->current_picture->data[0]) {
-        if((ret = halfpel_interpol(s, s->halfpel_plane[0], s->current_picture)) < 0)
-            return ret;
-    }
     s->last_picture[0] = s->current_picture;
     s->current_picture = tmp;
 
diff --git a/libavcodec/snow.h b/libavcodec/snow.h
index f5beca66e9..709fef6be5 100644
--- a/libavcodec/snow.h
+++ b/libavcodec/snow.h
@@ -127,7 +127,6 @@ typedef struct SnowContext{
     AVFrame *input_picture;              ///< new_picture with the internal linesizes
     AVFrame *current_picture;
     AVFrame *last_picture[MAX_REF_FRAMES];
-    uint8_t *halfpel_plane[MAX_REF_FRAMES][4][4];
     AVFrame *mconly_picture;
 //     uint8_t q_context[16];
     uint8_t header_state[32];
-- 
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