lavfi/color: use AVOptions

Signed-off-by: Paul B Mahol <onemda@gmail.com>

doc/filters.texi

@@ -3419,24 +3419,28 @@ cellauto=p='@@@@ @@ @@@@':s=100x400:full=0:rule=18
 
 Provide an uniformly colored input.
 
-It accepts the following parameters:
-@var{color}:@var{frame_size}:@var{frame_rate}
+This source accepts list of options in the form of
+@var{key}=@var{value} pairs separated by ":".
+
+Alternatively, it accepts a string in the form
+@var{color}:@var{size}:@var{rate}, but this syntax is
+deprecated.
 
 Follows the description of the accepted parameters.
 
 @table @option
 
-@item color
+@item color, c
 Specify the color of the source. It can be the name of a color (case
 insensitive match) or a 0xRRGGBB[AA] sequence, possibly followed by an
 alpha specifier. The default value is "black".
 
-@item frame_size
+@item size, s
 Specify the size of the sourced video, it may be a string of the form
 @var{width}x@var{height}, or the name of a size abbreviation. The
 default value is "320x240".
 
-@item frame_rate
+@item rate, r
 Specify the frame rate of the sourced video, as the number of frames
 generated per second. It has to be a string in the format
 @var{frame_rate_num}/@var{frame_rate_den}, an integer number, a float
@@ -3451,7 +3455,7 @@ frames per second, which will be overlayed over the source connected
 to the pad with identifier "in".
 
 @example
-"color=red@@0.2:qcif:10 [color]; [in][color] overlay [out]"
+"color=c=red@@0.2:s=qcif:r=10 [color]; [in][color] overlay [out]"
 @end example
 
 @section movie

libavfilter/vsrc_color.c

@@ -31,11 +31,15 @@
 #include "libavutil/colorspace.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/mathematics.h"
+#include "libavutil/opt.h"
 #include "libavutil/parseutils.h"
 #include "drawutils.h"
 
 typedef struct {
+    const AVClass *class;
     int w, h;
+    char *rate_str;
+    char *color_str;
     uint8_t color_rgba[4];
     AVRational time_base;
     uint64_t pts;
@@ -43,6 +47,26 @@ typedef struct {
     FFDrawColor color;
 } ColorContext;
 
+#define OFFSET(x) offsetof(ColorContext, x)
+
+static const AVOption color_options[]= {
+    { "size",  "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "320x240"}, 0, 0 },
+    { "s",     "set frame size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "320x240"}, 0, 0 },
+    { "rate",  "set frame rate", OFFSET(rate_str), AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0 },
+    { "r",     "set frame rate", OFFSET(rate_str), AV_OPT_TYPE_STRING, {.str = "25"}, 0, 0 },
+    { "color", "set color", OFFSET(color_str), AV_OPT_TYPE_STRING, {.str = "black"}, CHAR_MIN, CHAR_MAX },
+    { "c",     "set color", OFFSET(color_str), AV_OPT_TYPE_STRING, {.str = "black"}, CHAR_MIN, CHAR_MAX },
+    { NULL },
+};
+
+static const AVClass color_class = {
+    .class_name = "color",
+    .item_name  = av_default_item_name,
+    .option     = color_options,
+    .version    = LIBAVUTIL_VERSION_INT,
+    .category   = AV_CLASS_CATEGORY_FILTER,
+};
+
 static av_cold int color_init(AVFilterContext *ctx, const char *args, void *opaque)
 {
     ColorContext *color = ctx->priv;
@@ -50,28 +74,54 @@ static av_cold int color_init(AVFilterContext *ctx, const char *args, void *opaq
     char frame_size  [128] = "320x240";
     char frame_rate  [128] = "25";
     AVRational frame_rate_q;
-    int ret;
+    char *colon = 0, *equal = 0;
+    int ret = 0;
 
-    if (args)
-        sscanf(args, "%127[^:]:%127[^:]:%127s", color_string, frame_size, frame_rate);
+    color->class = &color_class;
 
-    if (av_parse_video_size(&color->w, &color->h, frame_size) < 0) {
-        av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", frame_size);
-        return AVERROR(EINVAL);
+    if (args) {
+        colon = strrchr(args, ':');
+        equal = strrchr(args, '=');
     }
 
-    if (av_parse_video_rate(&frame_rate_q, frame_rate) < 0 ||
-        frame_rate_q.den <= 0 || frame_rate_q.num <= 0) {
-        av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", frame_rate);
-        return AVERROR(EINVAL);
+    if (!args || (equal && (!colon || equal < colon))) {
+        av_opt_set_defaults(color);
+        if ((ret = av_set_options_string(color, args, "=", ":")) < 0) {
+            av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args);
+            goto end;
+        }
+        if (av_parse_video_rate(&frame_rate_q, color->rate_str) < 0 ||
+                frame_rate_q.den <= 0 || frame_rate_q.num <= 0) {
+            av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", color->rate_str);
+            ret = AVERROR(EINVAL);
+            goto end;
+        }
+        if (av_parse_color(color->color_rgba, color->color_str, -1, ctx) < 0) {
+            ret = AVERROR(EINVAL);
+            goto end;
+        }
+    } else {
+        av_log(ctx, AV_LOG_WARNING, "Flat options syntax is deprecated, use key=value pairs.\n");
+        sscanf(args, "%127[^:]:%127[^:]:%127s", color_string, frame_size, frame_rate);
+        if (av_parse_video_size(&color->w, &color->h, frame_size) < 0) {
+            av_log(ctx, AV_LOG_ERROR, "Invalid frame size: %s\n", frame_size);
+            return AVERROR(EINVAL);
+        }
+        if (av_parse_video_rate(&frame_rate_q, frame_rate) < 0 ||
+                frame_rate_q.den <= 0 || frame_rate_q.num <= 0) {
+            av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: %s\n", frame_rate);
+            return AVERROR(EINVAL);
+        }
+        if (av_parse_color(color->color_rgba, color_string, -1, ctx) < 0)
+            return AVERROR(EINVAL);
     }
+
     color->time_base.num = frame_rate_q.den;
     color->time_base.den = frame_rate_q.num;
 
-    if ((ret = av_parse_color(color->color_rgba, color_string, -1, ctx)) < 0)
-        return ret;
-
-    return 0;
+end:
+    av_opt_free(color);
+    return ret;
 }
 
 static int query_formats(AVFilterContext *ctx)
@@ -123,7 +173,7 @@ static int color_request_frame(AVFilterLink *link)
 
 AVFilter avfilter_vsrc_color = {
     .name        = "color",
-    .description = NULL_IF_CONFIG_SMALL("Provide an uniformly colored input, syntax is: [color[:size[:rate]]]."),
+    .description = NULL_IF_CONFIG_SMALL("Provide an uniformly colored input."),
 
     .priv_size = sizeof(ColorContext),
     .init      = color_init,