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lavfi/boxblur: add support to named options
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Stefano Sabatini
parent
6f77122bf5
commit
f30979e095
@ -1890,17 +1890,30 @@ blend=all_expr='if(eq(mod(X,2),mod(Y,2)),A,B)'
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Apply boxblur algorithm to the input video.
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This filter accepts the parameters:
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@var{luma_radius}:@var{luma_power}:@var{chroma_radius}:@var{chroma_power}:@var{alpha_radius}:@var{alpha_power}
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The filter accepts parameters as a list of @var{key}=@var{value}
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pairs, separated by ":". If the key of the first options is omitted,
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the arguments are interpreted according to the syntax
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@option{luma_radius}:@option{luma_power}:@option{chroma_radius}:@option{chroma_power}:@option{alpha_radius}:@option{alpha_power}.
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Chroma and alpha parameters are optional, if not specified they default
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to the corresponding values set for @var{luma_radius} and
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@var{luma_power}.
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A description of the accepted options follows.
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@var{luma_radius}, @var{chroma_radius}, and @var{alpha_radius} represent
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the radius in pixels of the box used for blurring the corresponding
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input plane. They are expressions, and can contain the following
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constants:
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@table @option
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@item luma_radius, lr
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@item chroma_radius, cr
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@item alpha_radius, ar
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Set an expression for the box radius in pixels used for blurring the
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corresponding input plane.
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The radius value must be a non-negative number, and must not be
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greater than the value of the expression @code{min(w,h)/2} for the
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luma and alpha planes, and of @code{min(cw,ch)/2} for the chroma
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planes.
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Default value for @option{luma_radius} is "2". If not specified,
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@option{chroma_radius} and @option{alpha_radius} default to the
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corresponding value set for @option{luma_radius}.
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The expressions can contain the following constants:
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@table @option
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@item w, h
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the input width and height in pixels
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@ -1913,13 +1926,18 @@ horizontal and vertical chroma subsample values. For example for the
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pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1.
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@end table
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The radius must be a non-negative number, and must not be greater than
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the value of the expression @code{min(w,h)/2} for the luma and alpha planes,
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and of @code{min(cw,ch)/2} for the chroma planes.
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@item luma_power, lp
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@item chroma_power, cp
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@item alpha_power, ap
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Specify how many times the boxblur filter is applied to the
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corresponding plane.
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@var{luma_power}, @var{chroma_power}, and @var{alpha_power} represent
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how many times the boxblur filter is applied to the corresponding
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plane.
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Default value for @option{luma_power} is 2. If not specified,
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@option{chroma_power} and @option{alpha_power} default to the
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corresponding value set for @option{luma_power}.
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A value of 0 will disable the effect.
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@end table
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Some examples follow:
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@ -1935,7 +1953,7 @@ boxblur=2:1
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@item
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Set luma radius to 2, alpha and chroma radius to 0
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@example
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boxblur=2:1:0:0:0:0
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boxblur=2:1:cr=0:ar=0
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@end example
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@item
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@ -30,7 +30,7 @@
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#define LIBAVFILTER_VERSION_MAJOR 3
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#define LIBAVFILTER_VERSION_MINOR 39
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#define LIBAVFILTER_VERSION_MICRO 100
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#define LIBAVFILTER_VERSION_MICRO 101
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#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
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LIBAVFILTER_VERSION_MINOR, \
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@ -28,6 +28,7 @@
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#include "libavutil/avstring.h"
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#include "libavutil/common.h"
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#include "libavutil/eval.h"
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#include "libavutil/opt.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "formats.h"
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@ -57,15 +58,14 @@ enum var_name {
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typedef struct {
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int radius;
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int power;
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char *radius_expr;
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} FilterParam;
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typedef struct {
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const AVClass *class;
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FilterParam luma_param;
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FilterParam chroma_param;
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FilterParam alpha_param;
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char luma_radius_expr [256];
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char chroma_radius_expr[256];
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char alpha_radius_expr [256];
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int hsub, vsub;
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int radius[4];
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@ -73,6 +73,30 @@ typedef struct {
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uint8_t *temp[2]; ///< temporary buffer used in blur_power()
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} BoxBlurContext;
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#define OFFSET(x) offsetof(BoxBlurContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption boxblur_options[] = {
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{ "luma_radius", "set luma radius", OFFSET(luma_param.radius_expr), AV_OPT_TYPE_STRING, {.str="2"}, .flags = FLAGS },
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{ "lr", "set luma radius", OFFSET(luma_param.radius_expr), AV_OPT_TYPE_STRING, {.str="2"}, .flags = FLAGS },
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{ "luma_power", "set luma power", OFFSET(luma_param.power), AV_OPT_TYPE_INT, {.i64=2}, 0, INT_MAX, .flags = FLAGS },
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{ "lp", "set luma power", OFFSET(luma_param.power), AV_OPT_TYPE_INT, {.i64=2}, 0, INT_MAX, .flags = FLAGS },
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{ "chroma_radius", "set chroma radius", OFFSET(chroma_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "cr", "set chroma radius", OFFSET(chroma_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "chroma_power", "set chroma power", OFFSET(chroma_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
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{ "cp", "set chroma power", OFFSET(chroma_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
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{ "alpha_radius", "set alpha radius", OFFSET(alpha_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "ar", "set alpha radius", OFFSET(alpha_param.radius_expr), AV_OPT_TYPE_STRING, {.str=NULL}, .flags = FLAGS },
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{ "alpha_power", "set alpha power", OFFSET(alpha_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
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{ "ap", "set alpha power", OFFSET(alpha_param.power), AV_OPT_TYPE_INT, {.i64=-1}, -1, INT_MAX, .flags = FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(boxblur);
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#define Y 0
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#define U 1
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#define V 2
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@ -81,35 +105,36 @@ typedef struct {
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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BoxBlurContext *boxblur = ctx->priv;
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int e;
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static const char *shorthand[] = {
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"luma_radius", "luma_power",
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"chroma_radius", "chroma_power",
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"alpha_radius", "alpha_power",
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NULL
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};
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int ret;
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if (!args) {
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av_log(ctx, AV_LOG_ERROR,
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"Filter expects 2 or 4 or 6 arguments, none provided\n");
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return AVERROR(EINVAL);
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boxblur->class = &boxblur_class;
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av_opt_set_defaults(boxblur);
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if ((ret = av_opt_set_from_string(boxblur, args, shorthand, "=", ":")) < 0)
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return ret;
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/* fill missing params */
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if (!boxblur->chroma_param.radius_expr) {
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boxblur->chroma_param.radius_expr = av_strdup(boxblur->luma_param.radius_expr);
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if (!boxblur->chroma_param.radius_expr)
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return AVERROR(ENOMEM);
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}
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e = sscanf(args, "%255[^:]:%d:%255[^:]:%d:%255[^:]:%d",
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boxblur->luma_radius_expr, &boxblur->luma_param .power,
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boxblur->chroma_radius_expr, &boxblur->chroma_param.power,
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boxblur->alpha_radius_expr, &boxblur->alpha_param .power);
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if (e != 2 && e != 4 && e != 6) {
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av_log(ctx, AV_LOG_ERROR,
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"Filter expects 2 or 4 or 6 params, provided %d\n", e);
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return AVERROR(EINVAL);
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}
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if (e < 4) {
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if (boxblur->chroma_param.power < 0)
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boxblur->chroma_param.power = boxblur->luma_param.power;
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av_strlcpy(boxblur->chroma_radius_expr, boxblur->luma_radius_expr,
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sizeof(boxblur->chroma_radius_expr));
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if (!boxblur->alpha_param.radius_expr) {
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boxblur->alpha_param.radius_expr = av_strdup(boxblur->luma_param.radius_expr);
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if (!boxblur->alpha_param.radius_expr)
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return AVERROR(ENOMEM);
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}
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if (e < 6) {
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if (boxblur->alpha_param.power < 0)
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boxblur->alpha_param.power = boxblur->luma_param.power;
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av_strlcpy(boxblur->alpha_radius_expr, boxblur->luma_radius_expr,
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sizeof(boxblur->alpha_radius_expr));
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}
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return 0;
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}
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@ -120,6 +145,7 @@ static av_cold void uninit(AVFilterContext *ctx)
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av_freep(&boxblur->temp[0]);
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av_freep(&boxblur->temp[1]);
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av_opt_free(boxblur);
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}
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static int query_formats(AVFilterContext *ctx)
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@ -163,7 +189,7 @@ static int config_input(AVFilterLink *inlink)
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var_values[VAR_VSUB] = 1<<boxblur->vsub;
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#define EVAL_RADIUS_EXPR(comp) \
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expr = boxblur->comp##_radius_expr; \
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expr = boxblur->comp##_param.radius_expr; \
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ret = av_expr_parse_and_eval(&res, expr, var_names, var_values, \
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NULL, NULL, NULL, NULL, NULL, 0, ctx); \
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boxblur->comp##_param.radius = res; \
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@ -366,4 +392,6 @@ AVFilter avfilter_vf_boxblur = {
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.inputs = avfilter_vf_boxblur_inputs,
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.outputs = avfilter_vf_boxblur_outputs,
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.priv_class = &boxblur_class,
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};
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