lavfi/smartblur: add support to named options

doc/filters.texi

@@ -4925,30 +4925,40 @@ expressed in the form "[@var{c0} @var{c1} @var{c2} @var{c3}]"
 
 Blur the input video without impacting the outlines.
 
-The filter accepts the following parameters:
-@var{luma_radius}:@var{luma_strength}:@var{luma_threshold}[:@var{chroma_radius}:@var{chroma_strength}:@var{chroma_threshold}]
-
-Parameters prefixed by @var{luma} indicate that they work on the
-luminance of the pixels whereas parameters prefixed by @var{chroma}
-refer to the chrominance of the pixels.
-
-If the chroma parameters are not set, the luma parameters are used for
-either the luminance and the chrominance of the pixels.
+This filter accepts parameters as a list of @var{key}=@var{value} pairs,
+separated by ":".
 
-@var{luma_radius} or @var{chroma_radius} must be a float number in the
-range [0.1,5.0] that specifies the variance of the gaussian filter
-used to blur the image (slower if larger).
+If the key of the first options is omitted, the arguments are
+interpreted according to the syntax:
+@var{luma_radius}:@var{luma_strength}:@var{luma_threshold}[:@var{chroma_radius}:@var{chroma_strength}:@var{chroma_threshold}]
 
-@var{luma_strength} or @var{chroma_strength} must be a float number in
-the range [-1.0,1.0] that configures the blurring. A value included in
-[0.0,1.0] will blur the image whereas a value included in [-1.0,0.0]
-will sharpen the image.
+A description of the accepted options follows.
 
-@var{luma_threshold} or @var{chroma_threshold} must be an integer in
-the range [-30,30] that is used as a coefficient to determine whether
-a pixel should be blurred or not. A value of 0 will filter all the
-image, a value included in [0,30] will filter flat areas and a value
-included in [-30,0] will filter edges.
+@table @option
+@item luma_radius, lr
+@item chroma_radius, cr
+Set the luma/chroma radius. The option value must be a float number in
+the range [0.1,5.0] that specifies the variance of the gaussian filter
+used to blur the image (slower if larger). Default value is 1.0.
+
+@item luma_strength, ls
+@item chroma_strength, cs
+Set the luma/chroma strength. The option value must be a float number
+in the range [-1.0,1.0] that configures the blurring. A value included
+in [0.0,1.0] will blur the image whereas a value included in
+[-1.0,0.0] will sharpen the image. Default value is 1.0.
+
+@item luma_threshold, lt
+@item chroma_threshold, ct
+Set the luma/chroma threshold used as a coefficient to determine
+whether a pixel should be blurred or not. The option value must be an
+integer in the range [-30,30]. A value of 0 will filter all the image,
+a value included in [0,30] will filter flat areas and a value included
+in [-30,0] will filter edges. Default value is 0.
+@end table
+
+If a chroma option is not explicitly set, the corresponding luma value
+is set.
 
 @section stereo3d
 

libavfilter/version.h

@@ -30,7 +30,7 @@
 
 #define LIBAVFILTER_VERSION_MAJOR  3
 #define LIBAVFILTER_VERSION_MINOR  44
-#define LIBAVFILTER_VERSION_MICRO 100
+#define LIBAVFILTER_VERSION_MICRO 101
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \

libavfilter/vf_smartblur.c

@@ -25,6 +25,7 @@
  * Ported from MPlayer libmpcodecs/vf_smartblur.c by Michael Niedermayer.
  */
 
+#include "libavutil/opt.h"
 #include "libavutil/pixdesc.h"
 #include "libswscale/swscale.h"
 
@@ -50,6 +51,7 @@ typedef struct {
 } FilterParam;
 
 typedef struct {
+    const AVClass *class;
     FilterParam  luma;
     FilterParam  chroma;
     int          hsub;
@@ -57,63 +59,63 @@ typedef struct {
     unsigned int sws_flags;
 } SmartblurContext;
 
-#define CHECK_PARAM(param, name, min, max, format, ret)                       \
-    if (param < min || param > max) {                                         \
-        av_log(ctx, AV_LOG_ERROR,                                             \
-               "Invalid " #name " value " #format ": "                        \
-               "must be included between range " #format " and " #format "\n",\
-               param, min, max);                                              \
-        ret = AVERROR(EINVAL);                                                \
-    }
+#define OFFSET(x) offsetof(SmartblurContext, x)
+#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
+
+static const AVOption smartblur_options[] = {
+    { "luma_radius",    "set luma radius",    OFFSET(luma.radius),    AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS },
+    { "lr"         ,    "set luma radius",    OFFSET(luma.radius),    AV_OPT_TYPE_FLOAT, {.dbl=1.0}, RADIUS_MIN, RADIUS_MAX, .flags=FLAGS },
+    { "luma_strength",  "set luma strength",  OFFSET(luma.strength),  AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS },
+    { "ls",             "set luma strength",  OFFSET(luma.strength),  AV_OPT_TYPE_FLOAT, {.dbl=1.0}, STRENGTH_MIN, STRENGTH_MAX, .flags=FLAGS },
+    { "luma_threshold", "set luma threshold", OFFSET(luma.threshold), AV_OPT_TYPE_INT,   {.i64=0}, THRESHOLD_MIN, THRESHOLD_MAX, .flags=FLAGS },
+    { "lt",             "set luma threshold", OFFSET(luma.threshold), AV_OPT_TYPE_INT,   {.i64=0}, THRESHOLD_MIN, THRESHOLD_MAX, .flags=FLAGS },
+
+    { "chroma_radius",    "set chroma radius",    OFFSET(chroma.radius),    AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1},   RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS },
+    { "cr",               "set chroma radius",    OFFSET(chroma.radius),    AV_OPT_TYPE_FLOAT, {.dbl=RADIUS_MIN-1},   RADIUS_MIN-1, RADIUS_MAX, .flags=FLAGS },
+    { "chroma_strength",  "set chroma strength",  OFFSET(chroma.strength),  AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS },
+    { "cs",               "set chroma strength",  OFFSET(chroma.strength),  AV_OPT_TYPE_FLOAT, {.dbl=STRENGTH_MIN-1}, STRENGTH_MIN-1, STRENGTH_MAX, .flags=FLAGS },
+    { "chroma_threshold", "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT,   {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS },
+    { "ct",               "set chroma threshold", OFFSET(chroma.threshold), AV_OPT_TYPE_INT,   {.i64=THRESHOLD_MIN-1}, THRESHOLD_MIN-1, THRESHOLD_MAX, .flags=FLAGS },
+
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(smartblur);
 
 static av_cold int init(AVFilterContext *ctx, const char *args)
 {
     SmartblurContext *sblur = ctx->priv;
-    int n = 0, ret = 0;
-    float lradius, lstrength, cradius, cstrength;
-    int lthreshold, cthreshold;
-
-    if (args)
-        n = sscanf(args, "%f:%f:%d:%f:%f:%d",
-                   &lradius, &lstrength, &lthreshold,
-                   &cradius, &cstrength, &cthreshold);
-
-    if (n != 3 && n != 6) {
-        av_log(ctx, AV_LOG_ERROR,
-               "Incorrect number of parameters or invalid syntax: "
-               "must be luma_radius:luma_strength:luma_threshold"
-               "[:chroma_radius:chroma_strength:chroma_threshold]\n");
-        return AVERROR(EINVAL);
-    }
+    int ret;
+    static const char *shorthand[] = {
+        "luma_radius", "luma_strength", "luma_threshold",
+        "chroma_radius", "chroma_strength", "chroma_threshold",
+        NULL
+    };
 
-    sblur->luma.radius    = lradius;
-    sblur->luma.strength  = lstrength;
-    sblur->luma.threshold = lthreshold;
+    sblur->class = &smartblur_class;
+    av_opt_set_defaults(sblur);
 
-    if (n == 3) {
-        sblur->chroma.radius    = sblur->luma.radius;
+    if ((ret = av_opt_set_from_string(sblur, args, shorthand, "=", ":")) < 0)
+        return ret;
+
+    /* make chroma default to luma values, if not explicitly set */
+    if (sblur->chroma.radius < RADIUS_MIN)
+        sblur->chroma.radius = sblur->luma.radius;
+    if (sblur->chroma.strength < STRENGTH_MIN)
         sblur->chroma.strength  = sblur->luma.strength;
+    if (sblur->chroma.threshold < THRESHOLD_MIN)
         sblur->chroma.threshold = sblur->luma.threshold;
-    } else {
-        sblur->chroma.radius    = cradius;
-        sblur->chroma.strength  = cstrength;
-        sblur->chroma.threshold = cthreshold;
-    }
 
     sblur->luma.quality = sblur->chroma.quality = 3.0;
     sblur->sws_flags = SWS_BICUBIC;
 
-    CHECK_PARAM(lradius,    luma radius,    RADIUS_MIN,    RADIUS_MAX,    %0.1f, ret)
-    CHECK_PARAM(lstrength,  luma strength,  STRENGTH_MIN,  STRENGTH_MAX,  %0.1f, ret)
-    CHECK_PARAM(lthreshold, luma threshold, THRESHOLD_MIN, THRESHOLD_MAX, %d,    ret)
+    av_log(ctx, AV_LOG_VERBOSE,
+           "luma_radius:%f luma_strength:%f luma_threshold:%d "
+           "chroma_radius:%f chroma_strength:%f chroma_threshold:%d ",
+           sblur->luma.radius, sblur->luma.strength, sblur->luma.threshold,
+           sblur->chroma.radius, sblur->chroma.strength, sblur->chroma.threshold);
 
-    if (n != 3) {
-        CHECK_PARAM(sblur->chroma.radius,    chroma radius,    RADIUS_MIN,   RADIUS_MAX,    %0.1f, ret)
-        CHECK_PARAM(sblur->chroma.strength,  chroma strength,  STRENGTH_MIN, STRENGTH_MAX,  %0.1f, ret)
-        CHECK_PARAM(sblur->chroma.threshold, chroma threshold, THRESHOLD_MIN,THRESHOLD_MAX, %d,    ret)
-    }
-
-    return ret;
+    return 0;
 }
 
 static av_cold void uninit(AVFilterContext *ctx)
@@ -122,6 +124,7 @@ static av_cold void uninit(AVFilterContext *ctx)
 
     sws_freeContext(sblur->luma.filter_context);
     sws_freeContext(sblur->chroma.filter_context);
+    av_opt_free(sblur);
 }
 
 static int query_formats(AVFilterContext *ctx)
@@ -310,4 +313,5 @@ AVFilter avfilter_vf_smartblur = {
     .query_formats = query_formats,
     .inputs        = smartblur_inputs,
     .outputs       = smartblur_outputs,
+    .priv_class    = &smartblur_class,
 };