@@ -3519,8 +3519,11 @@ Default mode is @code{merge}.

 Transpose rows with columns in the input video and optionally flip it.

-It accepts a parameter representing an integer, which can assume the

-values:

+This filter accepts the following named parameters:

+

+@table @option

+@item dir

+Specify the transposition direction. Can assume the following values:

 @table @samp

 @item 0, 4

@@ -3558,6 +3561,7 @@ l.r     l.L

 For values between 4-7 transposition is only done if the input video

 geometry is portrait and not landscape.

+@end table

 @section unsharp

@@ -30,7 +30,7 @@

 #define LIBAVFILTER_VERSION_MAJOR  3

 #define LIBAVFILTER_VERSION_MINOR  19

-#define LIBAVFILTER_VERSION_MICRO 100

+#define LIBAVFILTER_VERSION_MICRO 101

 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

                                                LIBAVFILTER_VERSION_MINOR, \

@@ -28,6 +28,7 @@

 #include <stdio.h>

 #include "libavutil/intreadwrite.h"

+#include "libavutil/opt.h"

 #include "libavutil/pixdesc.h"

 #include "libavutil/imgutils.h"

 #include "libavutil/internal.h"

@@ -37,6 +38,7 @@

 #include "video.h"

 typedef struct {

+    const AVClass *class;

     int hsub, vsub;

     int pixsteps[4];

@@ -48,20 +50,25 @@ typedef struct {

     int passthrough; ///< landscape passthrough mode enabled

 } TransContext;

+#define OFFSET(x) offsetof(TransContext, x)

+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

+

+static const AVOption transpose_options[] = {

+    { "dir", "set transpose direction", OFFSET(dir), AV_OPT_TYPE_INT, {.i64=0},  0, 7, FLAGS },

+    { NULL },

+};

+

+AVFILTER_DEFINE_CLASS(transpose);

+

 static av_cold int init(AVFilterContext *ctx, const char *args)

 {

     TransContext *trans = ctx->priv;

-    trans->dir = 0;

+    const char *shorthand[] = { "dir", NULL };

-    if (args)

-        sscanf(args, "%d", &trans->dir);

+    trans->class = &transpose_class;

+    av_opt_set_defaults(trans);

-    if (trans->dir < 0 || trans->dir > 7) {

-        av_log(ctx, AV_LOG_ERROR, "Invalid value %d not between 0 and 7.\n",

-               trans->dir);

-        return AVERROR(EINVAL);

-    }

-    return 0;

+    return av_opt_set_from_string(trans, args, shorthand, "=", ":");

 }

 static int query_formats(AVFilterContext *ctx)

@@ -262,4 +269,5 @@ AVFilter avfilter_vf_transpose = {

                                           .config_props    = config_props_output,

                                           .type            = AVMEDIA_TYPE_VIDEO, },

                                         { .name = NULL}},

+    .priv_class = &transpose_class,

 };