[FFmpeg-devel] [PATCH] avfilter/vf_program_opencl: make it possible to pass plane as argument to kernel

[Paul B Mahol]

Fixes #7190

Signed-off-by: Paul B Mahol <onemda at gmail.com>
---
 doc/filters.texi                |  4 ++++
 libavfilter/vf_program_opencl.c | 17 +++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/doc/filters.texi b/doc/filters.texi
index b957b9302e..5bd0e44b67 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -21297,6 +21297,8 @@ Number of inputs to the filter.  Defaults to 1.
 @item size, s
 Size of output frames.  Defaults to the same as the first input.
 
+ at item plane
+Currently processed plane number is set as last kernel argument.
 @end table
 
 The program source file must contain a kernel function with the given name,
@@ -22483,6 +22485,8 @@ Pixel format to use for the generated frames.  This must be set.
 @item rate, r
 Number of frames generated every second.  Default value is '25'.
 
+ at item plane
+Currently processed plane number is set as last kernel argument.
 @end table
 
 For details of how the program loading works, see the @ref{program_opencl}
diff --git a/libavfilter/vf_program_opencl.c b/libavfilter/vf_program_opencl.c
index ec25e931f5..3cf93464ba 100644
--- a/libavfilter/vf_program_opencl.c
+++ b/libavfilter/vf_program_opencl.c
@@ -42,6 +42,7 @@ typedef struct ProgramOpenCLContext {
     const char         *source_file;
     const char         *kernel_name;
     int                 nb_inputs;
+    int                 plane_is_arg;
     int                 width, height;
     enum AVPixelFormat  source_format;
     AVRational          source_rate;
@@ -138,6 +139,16 @@ static int program_opencl_run(AVFilterContext *avctx)
             }
         }
 
+        if (ctx->plane_is_arg) {
+            cle = clSetKernelArg(ctx->kernel, 2 + ctx->nb_inputs, sizeof(cl_int), &plane);
+            if (cle != CL_SUCCESS) {
+                av_log(avctx, AV_LOG_ERROR, "Failed to set kernel "
+                       "plane argument %d: %d.\n", plane, cle);
+                err = AVERROR_UNKNOWN;
+                goto fail;
+            }
+        }
+
         err = ff_opencl_filter_work_size_from_image(avctx, global_work,
                                                     output, plane, 0);
         if (err < 0)
@@ -348,6 +359,9 @@ static const AVOption program_opencl_options[] = {
     { "s",      "Video size",       OFFSET(width),
       AV_OPT_TYPE_IMAGE_SIZE,       { .str = NULL }, 0, 0, FLAGS },
 
+    { "plane",  "Pass currently processed plane as argument", OFFSET(plane_is_arg),
+      AV_OPT_TYPE_BOOL,       { .i64 = 0 }, 0, 1, FLAGS },
+
     { NULL },
 };
 
@@ -400,6 +414,9 @@ static const AVOption openclsrc_options[] = {
     { "r",      "Video frame rate", OFFSET(source_rate),
       AV_OPT_TYPE_VIDEO_RATE,       { .str = "25" }, 0, INT_MAX, FLAGS },
 
+    { "plane",  "Pass currently processed plane as argument", OFFSET(plane_is_arg),
+      AV_OPT_TYPE_BOOL,       { .i64 = 0 }, 0, 1, FLAGS },
+
     { NULL },
 };
 
-- 
2.17.1