lavfi: implement ff_query_formats_all().

libavfilter/formats.c

@@ -516,7 +516,8 @@ void ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
                        ff_formats_ref, formats);
 }
 
-int ff_default_query_formats(AVFilterContext *ctx)
+static int default_query_formats_common(AVFilterContext *ctx,
+                                        AVFilterChannelLayouts *(layouts)(void))
 {
     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
@@ -524,13 +525,23 @@ int ff_default_query_formats(AVFilterContext *ctx)
 
     ff_set_common_formats(ctx, ff_all_formats(type));
     if (type == AVMEDIA_TYPE_AUDIO) {
-        ff_set_common_channel_layouts(ctx, ff_all_channel_layouts());
+        ff_set_common_channel_layouts(ctx, layouts());
         ff_set_common_samplerates(ctx, ff_all_samplerates());
     }
 
     return 0;
 }
 
+int ff_default_query_formats(AVFilterContext *ctx)
+{
+    return default_query_formats_common(ctx, ff_all_channel_layouts);
+}
+
+int ff_query_formats_all(AVFilterContext *ctx)
+{
+    return default_query_formats_common(ctx, ff_all_channel_counts);
+}
+
 /* internal functions for parsing audio format arguments */
 
 int ff_parse_pixel_format(enum AVPixelFormat *ret, const char *arg, void *log_ctx)

libavfilter/formats.h

@@ -172,6 +172,14 @@ void ff_channel_layouts_changeref(AVFilterChannelLayouts **oldref,
 
 int ff_default_query_formats(AVFilterContext *ctx);
 
+/**
+ * Set the formats list to all existing formats.
+ * This function behaves like ff_default_query_formats(), except it also
+ * accepts channel layouts with unknown disposition. It should only be used
+ * with audio filters.
+ */
+int ff_query_formats_all(AVFilterContext *ctx);
+
 
 /**
  * Create a list of supported formats. This is intended for use in