vf_(no)format: switch to an AVOptions-based system.

doc/filters.texi

@@ -1067,16 +1067,22 @@ Convert the input video to one of the specified pixel formats.
 Libavfilter will try to pick one that is supported for the input to
 the next filter.
 
-The filter accepts a list of pixel format names, separated by ":",
-for example "yuv420p:monow:rgb24".
+This filter accepts the following parameters:
+@table @option
+
+@item pix_fmts
+A '|'-separated list of pixel format names, for example
+"pix_fmts=yuv420p|monow|rgb24".
+
+@end table
 
 Some examples follow:
 @example
 # convert the input video to the format "yuv420p"
-format=yuv420p
+format=pix_fmts=yuv420p
 
 # convert the input video to any of the formats in the list
-format=yuv420p:yuv444p:yuv410p
+format=pix_fmts=yuv420p|yuv444p|yuv410p
 @end example
 
 @section fps
@@ -1336,17 +1342,23 @@ alpha component (if available). The default value in input is 0.
 Force libavfilter not to use any of the specified pixel formats for the
 input to the next filter.
 
-The filter accepts a list of pixel format names, separated by ":",
-for example "yuv420p:monow:rgb24".
+This filter accepts the following parameters:
+@table @option
+
+@item pix_fmts
+A '|'-separated list of pixel format names, for example
+"pix_fmts=yuv420p|monow|rgb24".
+
+@end table
 
 Some examples follow:
 @example
 # force libavfilter to use a format different from "yuv420p" for the
 # input to the vflip filter
-noformat=yuv420p,vflip
+noformat=pix_fmts=yuv420p,vflip
 
 # convert the input video to any of the formats not contained in the list
-noformat=yuv420p:yuv444p:yuv410p
+noformat=yuv420p|yuv444p|yuv410p
 @end example
 
 @section null

libavfilter/avfilter.c

@@ -486,6 +486,33 @@ int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque
             ret = av_dict_parse_string(&options, args, "=", ":", 0);
             if (ret < 0)
                 goto fail;
+#if FF_API_OLD_FILTER_OPTS
+        } else if (!strcmp(filter->filter->name, "format") ||
+                   !strcmp(filter->filter->name, "noformat")) {
+            /* a hack for compatibility with the old syntax
+             * replace colons with |s */
+            char *copy = av_strdup(args);
+            char *p    = copy;
+
+            if (!copy) {
+                ret = AVERROR(ENOMEM);
+                goto fail;
+            }
+
+            if (strchr(copy, ':')) {
+                av_log(filter, AV_LOG_WARNING, "This syntax is deprecated. Use "
+                       "'|' to separate the list items.\n");
+            }
+
+            while ((p = strchr(p, ':')))
+                *p++ = '|';
+
+            ret = process_unnamed_options(filter, &options, copy);
+            av_freep(&copy);
+
+            if (ret < 0)
+                goto fail;
+#endif
         } else {
             ret = process_unnamed_options(filter, &options, args);
             if (ret < 0)

libavfilter/vf_format.c

@@ -28,12 +28,16 @@
 #include "libavutil/internal.h"
 #include "libavutil/mem.h"
 #include "libavutil/pixdesc.h"
+#include "libavutil/opt.h"
+
 #include "avfilter.h"
 #include "formats.h"
 #include "internal.h"
 #include "video.h"
 
 typedef struct {
+    const AVClass *class;
+    char *pix_fmts;
     /**
      * List of flags telling if a given image format has been listed
      * as argument to the filter.
@@ -52,8 +56,8 @@ static av_cold int init(AVFilterContext *ctx, const char *args)
     enum AVPixelFormat pix_fmt;
 
     /* parse the list of formats */
-    for (cur = args; cur; cur = sep ? sep+1 : NULL) {
-        if (!(sep = strchr(cur, ':')))
+    for (cur = format->pix_fmts; cur; cur = sep ? sep + 1 : NULL) {
+        if (!(sep = strchr(cur, '|')))
             pix_fmt_name_len = strlen(cur);
         else
             pix_fmt_name_len = sep - cur;
@@ -92,6 +96,12 @@ static AVFilterFormats *make_format_list(FormatContext *format, int flag)
     return formats;
 }
 
+#define OFFSET(x) offsetof(FormatContext, x)
+static const AVOption options[] = {
+    { "pix_fmts", "A '|'-separated list of pixel formats", OFFSET(pix_fmts), AV_OPT_TYPE_STRING, .flags = AV_OPT_FLAG_VIDEO_PARAM },
+    { NULL },
+};
+
 #if CONFIG_FORMAT_FILTER
 static int query_formats_format(AVFilterContext *ctx)
 {
@@ -99,6 +109,13 @@ static int query_formats_format(AVFilterContext *ctx)
     return 0;
 }
 
+static const AVClass format_class = {
+    .class_name = "format",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
 static const AVFilterPad avfilter_vf_format_inputs[] = {
     {
         .name             = "default",
@@ -125,6 +142,7 @@ AVFilter avfilter_vf_format = {
     .query_formats = query_formats_format,
 
     .priv_size = sizeof(FormatContext),
+    .priv_class = &format_class,
 
     .inputs    = avfilter_vf_format_inputs,
     .outputs   = avfilter_vf_format_outputs,
@@ -138,6 +156,13 @@ static int query_formats_noformat(AVFilterContext *ctx)
     return 0;
 }
 
+static const AVClass noformat_class = {
+    .class_name = "noformat",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
 static const AVFilterPad avfilter_vf_noformat_inputs[] = {
     {
         .name             = "default",
@@ -164,6 +189,7 @@ AVFilter avfilter_vf_noformat = {
     .query_formats = query_formats_noformat,
 
     .priv_size = sizeof(FormatContext),
+    .priv_class = &noformat_class,
 
     .inputs    = avfilter_vf_noformat_inputs,
     .outputs   = avfilter_vf_noformat_outputs,