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lavfi/pad: add support to named options
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Stefano Sabatini
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1897109c00
@ -3725,14 +3725,50 @@ testsrc=s=100x100, split=4 [in0][in1][in2][in3];
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@section pad
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Add paddings to the input image, and places the original input at the
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Add paddings to the input image, and place the original input at the
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given coordinates @var{x}, @var{y}.
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It accepts the following parameters:
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The filter accepts parameters as a list of @var{key}=@var{value} pairs,
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separated by ":".
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If the key of the first options is omitted, the arguments are
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interpreted according to the syntax
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@var{width}:@var{height}:@var{x}:@var{y}:@var{color}.
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The parameters @var{width}, @var{height}, @var{x}, and @var{y} are
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expressions containing the following constants:
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A description of the accepted options follows.
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@table @option
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@item width, w
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@item height, h
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Specify an expression for the size of the output image with the
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paddings added. If the value for @var{width} or @var{height} is 0, the
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corresponding input size is used for the output.
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The @var{width} expression can reference the value set by the
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@var{height} expression, and vice versa.
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The default value of @var{width} and @var{height} is 0.
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@item x
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@item y
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Specify an expression for the offsets where to place the input image
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in the padded area with respect to the top/left border of the output
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image.
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The @var{x} expression can reference the value set by the @var{y}
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expression, and vice versa.
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The default value of @var{x} and @var{y} is 0.
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@item color
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Specify the color of the padded area, it can be the name of a color
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(case insensitive match) or a 0xRRGGBB[AA] sequence.
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The default value of @var{color} is "black".
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@end table
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The value for the @var{width}, @var{height}, @var{x}, and @var{y}
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options are expressions containing the following constants:
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@table @option
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@item in_w, in_h
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@ -3766,39 +3802,6 @@ 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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Follows the description of the accepted parameters.
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@table @option
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@item width, height
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Specify the size of the output image with the paddings added. If the
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value for @var{width} or @var{height} is 0, the corresponding input size
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is used for the output.
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The @var{width} expression can reference the value set by the
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@var{height} expression, and vice versa.
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The default value of @var{width} and @var{height} is 0.
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@item x, y
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Specify the offsets where to place the input image in the padded area
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with respect to the top/left border of the output image.
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The @var{x} expression can reference the value set by the @var{y}
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expression, and vice versa.
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The default value of @var{x} and @var{y} is 0.
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@item color
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Specify the color of the padded area, it can be the name of a color
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(case insensitive match) or a 0xRRGGBB[AA] sequence.
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The default value of @var{color} is "black".
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@end table
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@subsection Examples
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@itemize
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@ -3810,6 +3813,11 @@ column 0, row 40:
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pad=640:480:0:40:violet
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@end example
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The example above is equivalent to the following command:
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@example
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pad=width=640:height=480:x=0:y=40:color=violet
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@end example
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@item
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Pad the input to get an output with dimensions increased by 3/2,
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and put the input video at the center of the padded area:
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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 35
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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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@ -35,6 +35,7 @@
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#include "libavutil/colorspace.h"
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#include "libavutil/avassert.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/opt.h"
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#include "libavutil/parseutils.h"
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#include "libavutil/mathematics.h"
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#include "drawutils.h"
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@ -76,40 +77,61 @@ static int query_formats(AVFilterContext *ctx)
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}
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typedef struct {
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const AVClass *class;
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int w, h; ///< output dimensions, a value of 0 will result in the input size
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int x, y; ///< offsets of the input area with respect to the padded area
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int in_w, in_h; ///< width and height for the padded input video, which has to be aligned to the chroma values in order to avoid chroma issues
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char w_expr[256]; ///< width expression string
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char h_expr[256]; ///< height expression string
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char x_expr[256]; ///< width expression string
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char y_expr[256]; ///< height expression string
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char *w_expr; ///< width expression string
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char *h_expr; ///< height expression string
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char *x_expr; ///< width expression string
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char *y_expr; ///< height expression string
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char *color_str;
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uint8_t rgba_color[4]; ///< color for the padding area
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FFDrawContext draw;
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FFDrawColor color;
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} PadContext;
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#define OFFSET(x) offsetof(PadContext, x)
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#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption pad_options[] = {
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{ "width", "set the pad area width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "w", "set the pad area width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "height", "set the pad area height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "h", "set the pad area height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "x", "set the x offset expression for the input image position", OFFSET(x_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "y", "set the y offset expression for the input image position", OFFSET(y_expr), AV_OPT_TYPE_STRING, {.str = "0"}, CHAR_MIN, CHAR_MAX, FLAGS },
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{ "color", "set the color of the padded area border", OFFSET(color_str), AV_OPT_TYPE_STRING, {.str = "black"}, .flags = FLAGS },
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{NULL}
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};
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AVFILTER_DEFINE_CLASS(pad);
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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PadContext *pad = ctx->priv;
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char color_string[128] = "black";
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static const char *shorthand[] = { "width", "height", "x", "y", "color", NULL };
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int ret;
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av_strlcpy(pad->w_expr, "iw", sizeof(pad->w_expr));
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av_strlcpy(pad->h_expr, "ih", sizeof(pad->h_expr));
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av_strlcpy(pad->x_expr, "0" , sizeof(pad->w_expr));
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av_strlcpy(pad->y_expr, "0" , sizeof(pad->h_expr));
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pad->class = &pad_class;
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av_opt_set_defaults(pad);
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if (args)
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sscanf(args, "%255[^:]:%255[^:]:%255[^:]:%255[^:]:%127s",
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pad->w_expr, pad->h_expr, pad->x_expr, pad->y_expr, color_string);
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if ((ret = av_opt_set_from_string(pad, args, shorthand, "=", ":")) < 0)
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return ret;
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if (av_parse_color(pad->rgba_color, color_string, -1, ctx) < 0)
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if (av_parse_color(pad->rgba_color, pad->color_str, -1, ctx) < 0)
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return AVERROR(EINVAL);
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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PadContext *pad = ctx->priv;
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av_opt_free(pad);
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}
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static int config_input(AVFilterLink *inlink)
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{
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AVFilterContext *ctx = inlink->dst;
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@ -368,9 +390,11 @@ AVFilter avfilter_vf_pad = {
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.priv_size = sizeof(PadContext),
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = avfilter_vf_pad_inputs,
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.outputs = avfilter_vf_pad_outputs,
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.priv_class = &pad_class,
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};
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