avfilter/vf_histogram: use the name 's' for the pointer to the private context

This is consistent across filters.

libavfilter/vf_histogram.c

@@ -192,12 +192,12 @@ static const uint8_t white_gbrp_color[4] = { 255, 255, 255, 255 };
 
 static int config_input(AVFilterLink *inlink)
 {
-    HistogramContext *h = inlink->dst->priv;
+    HistogramContext *s = inlink->dst->priv;
 
-    h->desc  = av_pix_fmt_desc_get(inlink->format);
-    h->ncomp = h->desc->nb_components;
-    h->histogram_size = 1 << h->desc->comp[0].depth;
-    h->mult = h->histogram_size / 256;
+    s->desc  = av_pix_fmt_desc_get(inlink->format);
+    s->ncomp = s->desc->nb_components;
+    s->histogram_size = 1 << s->desc->comp[0].depth;
+    s->mult = s->histogram_size / 256;
 
     switch (inlink->format) {
     case AV_PIX_FMT_GBRAP12:
@@ -207,21 +207,21 @@ static int config_input(AVFilterLink *inlink)
     case AV_PIX_FMT_GBRP9:
     case AV_PIX_FMT_GBRAP:
     case AV_PIX_FMT_GBRP:
-        memcpy(h->bg_color, black_gbrp_color, 4);
-        memcpy(h->fg_color, white_gbrp_color, 4);
+        memcpy(s->bg_color, black_gbrp_color, 4);
+        memcpy(s->fg_color, white_gbrp_color, 4);
         break;
     default:
-        memcpy(h->bg_color, black_yuva_color, 4);
-        memcpy(h->fg_color, white_yuva_color, 4);
+        memcpy(s->bg_color, black_yuva_color, 4);
+        memcpy(s->fg_color, white_yuva_color, 4);
     }
 
-    h->fg_color[3] = h->fgopacity * 255;
-    h->bg_color[3] = h->bgopacity * 255;
+    s->fg_color[3] = s->fgopacity * 255;
+    s->bg_color[3] = s->bgopacity * 255;
 
-    h->planeheight[1] = h->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, h->desc->log2_chroma_h);
-    h->planeheight[0] = h->planeheight[3] = inlink->h;
-    h->planewidth[1]  = h->planewidth[2]  = AV_CEIL_RSHIFT(inlink->w, h->desc->log2_chroma_w);
-    h->planewidth[0]  = h->planewidth[3]  = inlink->w;
+    s->planeheight[1] = s->planeheight[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h);
+    s->planeheight[0] = s->planeheight[3] = inlink->h;
+    s->planewidth[1]  = s->planewidth[2]  = AV_CEIL_RSHIFT(inlink->w, s->desc->log2_chroma_w);
+    s->planewidth[0]  = s->planewidth[3]  = inlink->w;
 
     return 0;
 }
@@ -229,18 +229,18 @@ static int config_input(AVFilterLink *inlink)
 static int config_output(AVFilterLink *outlink)
 {
     AVFilterContext *ctx = outlink->src;
-    HistogramContext *h = ctx->priv;
+    HistogramContext *s = ctx->priv;
     int ncomp = 0, i;
 
-    for (i = 0; i < h->ncomp; i++) {
-        if ((1 << i) & h->components)
+    for (i = 0; i < s->ncomp; i++) {
+        if ((1 << i) & s->components)
             ncomp++;
     }
-    outlink->w = h->histogram_size * FFMAX(ncomp * (h->display_mode == 1), 1);
-    outlink->h = (h->level_height + h->scale_height) * FFMAX(ncomp * (h->display_mode == 2), 1);
+    outlink->w = s->histogram_size * FFMAX(ncomp * (s->display_mode == 1), 1);
+    outlink->h = (s->level_height + s->scale_height) * FFMAX(ncomp * (s->display_mode == 2), 1);
 
-    h->odesc = av_pix_fmt_desc_get(outlink->format);
-    h->dncomp = h->odesc->nb_components;
+    s->odesc = av_pix_fmt_desc_get(outlink->format);
+    s->dncomp = s->odesc->nb_components;
     outlink->sample_aspect_ratio = (AVRational){1,1};
 
     return 0;
@@ -248,7 +248,7 @@ static int config_output(AVFilterLink *outlink)
 
 static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 {
-    HistogramContext *h   = inlink->dst->priv;
+    HistogramContext *s   = inlink->dst->priv;
     AVFilterContext *ctx  = inlink->dst;
     AVFilterLink *outlink = ctx->outputs[0];
     AVFrame *out;
@@ -264,92 +264,92 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 
     for (k = 0; k < 4 && out->data[k]; k++) {
         const int is_chroma = (k == 1 || k == 2);
-        const int dst_h = AV_CEIL_RSHIFT(outlink->h, (is_chroma ? h->odesc->log2_chroma_h : 0));
-        const int dst_w = AV_CEIL_RSHIFT(outlink->w, (is_chroma ? h->odesc->log2_chroma_w : 0));
+        const int dst_h = AV_CEIL_RSHIFT(outlink->h, (is_chroma ? s->odesc->log2_chroma_h : 0));
+        const int dst_w = AV_CEIL_RSHIFT(outlink->w, (is_chroma ? s->odesc->log2_chroma_w : 0));
 
-        if (h->histogram_size <= 256) {
+        if (s->histogram_size <= 256) {
             for (i = 0; i < dst_h ; i++)
-                memset(out->data[h->odesc->comp[k].plane] +
-                       i * out->linesize[h->odesc->comp[k].plane],
-                       h->bg_color[k], dst_w);
+                memset(out->data[s->odesc->comp[k].plane] +
+                       i * out->linesize[s->odesc->comp[k].plane],
+                       s->bg_color[k], dst_w);
         } else {
-            const int mult = h->mult;
+            const int mult = s->mult;
 
             for (i = 0; i < dst_h ; i++)
                 for (j = 0; j < dst_w; j++)
-                    AV_WN16(out->data[h->odesc->comp[k].plane] +
-                        i * out->linesize[h->odesc->comp[k].plane] + j * 2,
-                        h->bg_color[k] * mult);
+                    AV_WN16(out->data[s->odesc->comp[k].plane] +
+                        i * out->linesize[s->odesc->comp[k].plane] + j * 2,
+                        s->bg_color[k] * mult);
         }
     }
 
-    for (m = 0, k = 0; k < h->ncomp; k++) {
-        const int p = h->desc->comp[k].plane;
-        const int height = h->planeheight[p];
-        const int width = h->planewidth[p];
+    for (m = 0, k = 0; k < s->ncomp; k++) {
+        const int p = s->desc->comp[k].plane;
+        const int height = s->planeheight[p];
+        const int width = s->planewidth[p];
         double max_hval_log;
         unsigned max_hval = 0;
         int start, startx;
 
-        if (!((1 << k) & h->components))
+        if (!((1 << k) & s->components))
             continue;
-        startx = m * h->histogram_size * (h->display_mode == 1);
-        start = m++ * (h->level_height + h->scale_height) * (h->display_mode == 2);
+        startx = m * s->histogram_size * (s->display_mode == 1);
+        start = m++ * (s->level_height + s->scale_height) * (s->display_mode == 2);
 
-        if (h->histogram_size <= 256) {
+        if (s->histogram_size <= 256) {
             for (i = 0; i < height; i++) {
                 const uint8_t *src = in->data[p] + i * in->linesize[p];
                 for (j = 0; j < width; j++)
-                    h->histogram[src[j]]++;
+                    s->histogram[src[j]]++;
             }
         } else {
             for (i = 0; i < height; i++) {
                 const uint16_t *src = (const uint16_t *)(in->data[p] + i * in->linesize[p]);
                 for (j = 0; j < width; j++)
-                    h->histogram[src[j]]++;
+                    s->histogram[src[j]]++;
             }
         }
 
-        for (i = 0; i < h->histogram_size; i++)
-            max_hval = FFMAX(max_hval, h->histogram[i]);
+        for (i = 0; i < s->histogram_size; i++)
+            max_hval = FFMAX(max_hval, s->histogram[i]);
         max_hval_log = log2(max_hval + 1);
 
-        for (i = 0; i < h->histogram_size; i++) {
+        for (i = 0; i < s->histogram_size; i++) {
             int col_height;
 
-            if (h->levels_mode)
-                col_height = lrint(h->level_height * (1. - (log2(h->histogram[i] + 1) / max_hval_log)));
+            if (s->levels_mode)
+                col_height = lrint(s->level_height * (1. - (log2(s->histogram[i] + 1) / max_hval_log)));
             else
-                col_height = h->level_height - (h->histogram[i] * (int64_t)h->level_height + max_hval - 1) / max_hval;
+                col_height = s->level_height - (s->histogram[i] * (int64_t)s->level_height + max_hval - 1) / max_hval;
 
-            if (h->histogram_size <= 256) {
-                for (j = h->level_height - 1; j >= col_height; j--) {
-                    if (h->display_mode) {
-                        for (l = 0; l < h->dncomp; l++)
-                            out->data[l][(j + start) * out->linesize[l] + startx + i] = h->fg_color[l];
+            if (s->histogram_size <= 256) {
+                for (j = s->level_height - 1; j >= col_height; j--) {
+                    if (s->display_mode) {
+                        for (l = 0; l < s->dncomp; l++)
+                            out->data[l][(j + start) * out->linesize[l] + startx + i] = s->fg_color[l];
                     } else {
                         out->data[p][(j + start) * out->linesize[p] + startx + i] = 255;
                     }
                 }
-                for (j = h->level_height + h->scale_height - 1; j >= h->level_height; j--)
+                for (j = s->level_height + s->scale_height - 1; j >= s->level_height; j--)
                     out->data[p][(j + start) * out->linesize[p] + startx + i] = i;
             } else {
-                const int mult = h->mult;
+                const int mult = s->mult;
 
-                for (j = h->level_height - 1; j >= col_height; j--) {
-                    if (h->display_mode) {
-                        for (l = 0; l < h->dncomp; l++)
-                            AV_WN16(out->data[l] + (j + start) * out->linesize[l] + startx * 2 + i * 2, h->fg_color[l] * mult);
+                for (j = s->level_height - 1; j >= col_height; j--) {
+                    if (s->display_mode) {
+                        for (l = 0; l < s->dncomp; l++)
+                            AV_WN16(out->data[l] + (j + start) * out->linesize[l] + startx * 2 + i * 2, s->fg_color[l] * mult);
                     } else {
                         AV_WN16(out->data[p] + (j + start) * out->linesize[p] + startx * 2 + i * 2, 255 * mult);
                     }
                 }
-                for (j = h->level_height + h->scale_height - 1; j >= h->level_height; j--)
+                for (j = s->level_height + s->scale_height - 1; j >= s->level_height; j--)
                     AV_WN16(out->data[p] + (j + start) * out->linesize[p] + startx * 2 + i * 2, i);
             }
         }
 
-        memset(h->histogram, 0, h->histogram_size * sizeof(unsigned));
+        memset(s->histogram, 0, s->histogram_size * sizeof(unsigned));
     }
 
     av_frame_free(&in);