avfilter/vf_mix: add planes option

doc/filters.texi

@@ -15684,6 +15684,9 @@ Specify scale, if it is set it will be multiplied with sum
 of each weight multiplied with pixel values to give final destination
 pixel value. By default @var{scale} is auto scaled to sum of weights.
 
+@item planes
+Set which planes to filter. Default is all. Allowed range is from 0 to 15.
+
 @item duration
 Specify how end of stream is determined.
 @table @samp
@@ -15704,6 +15707,7 @@ This filter supports the following commands:
 @table @option
 @item weights
 @item scale
+@item planes
 Syntax is same as option with same name.
 @end table
 
@@ -21131,6 +21135,9 @@ unset weights.
 Specify scale, if it is set it will be multiplied with sum
 of each weight multiplied with pixel values to give final destination
 pixel value. By default @var{scale} is auto scaled to sum of weights.
+
+@item planes
+Set which planes to filter. Default is all. Allowed range is from 0 to 15.
 @end table
 
 @subsection Examples
@@ -21161,6 +21168,7 @@ This filter supports the following commands:
 @table @option
 @item weights
 @item scale
+@item planes
 Syntax is same as option with same name.
 @end table
 

libavfilter/vf_mix.c

@@ -45,6 +45,7 @@ typedef struct MixContext {
 
     int depth;
     int max;
+    int planes;
     int nb_planes;
     int linesize[4];
     int height[4];
@@ -147,6 +148,14 @@ static int mix_frames(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
             const int slice_end = (s->height[p] * (jobnr+1)) / nb_jobs;
             uint8_t *dst = out->data[p] + slice_start * out->linesize[p];
 
+            if (!((1 << p) & s->planes)) {
+                av_image_copy_plane(dst, out->linesize[p],
+                                    in[0]->data[p] + slice_start * in[0]->linesize[p],
+                                    in[0]->linesize[p],
+                                    s->linesize[p], slice_end - slice_start);
+                continue;
+            }
+
             for (y = slice_start; y < slice_end; y++) {
                 for (x = 0; x < s->linesize[p]; x++) {
                     float val = 0.f;
@@ -169,6 +178,14 @@ static int mix_frames(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
             const int slice_end = (s->height[p] * (jobnr+1)) / nb_jobs;
             uint16_t *dst = (uint16_t *)(out->data[p] + slice_start * out->linesize[p]);
 
+            if (!((1 << p) & s->planes)) {
+                av_image_copy_plane((uint8_t *)dst, out->linesize[p],
+                                    in[0]->data[p] + slice_start * in[0]->linesize[p],
+                                    in[0]->linesize[p],
+                                    s->linesize[p], slice_end - slice_start);
+                continue;
+            }
+
             for (y = slice_start; y < slice_end; y++) {
                 for (x = 0; x < s->linesize[p] / 2; x++) {
                     float val = 0.f;
@@ -331,6 +348,7 @@ static const AVOption mix_options[] = {
     { "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT16_MAX, .flags = FLAGS },
     { "weights", "set weight for each input", OFFSET(weights_str), AV_OPT_TYPE_STRING, {.str="1 1"}, 0, 0, .flags = TFLAGS },
     { "scale", "set scale", OFFSET(scale), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, INT16_MAX, .flags = TFLAGS },
+    { "planes", "set what planes to filter", OFFSET(planes),   AV_OPT_TYPE_FLAGS, {.i64=15}, 0, 15,  .flags = TFLAGS },
     { "duration", "how to determine end of stream", OFFSET(duration), AV_OPT_TYPE_INT, {.i64=0}, 0, 2, .flags = FLAGS, "duration" },
         { "longest",  "Duration of longest input",  0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "duration" },
         { "shortest", "Duration of shortest input", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "duration" },
@@ -413,6 +431,7 @@ static const AVOption tmix_options[] = {
     { "frames", "set number of successive frames to mix", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=3}, 1, 1024, .flags = FLAGS },
     { "weights", "set weight for each frame", OFFSET(weights_str), AV_OPT_TYPE_STRING, {.str="1 1 1"}, 0, 0, .flags = TFLAGS },
     { "scale", "set scale", OFFSET(scale), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, INT16_MAX, .flags = TFLAGS },
+    { "planes", "set what planes to filter", OFFSET(planes),   AV_OPT_TYPE_FLAGS, {.i64=15}, 0, 15,  .flags = TFLAGS },
     { NULL },
 };