avfilter/formats: Make ff_formats_pixdesc_filter return AVFilterFormats*

Up until now, it has returned the AVFilterFormats list via
an AVFilterFormats** parameter; the actual return value was an int
that was always AVERROR(ENOMEM) on error. The AVFilterFormats**
argument was a pure output parameter which was only documented
by naming the parameter rfmts. Yet nevertheless all callers
initialized the underlying AVFilterFormats* to NULL.

This commit changes this to return a pointer to AVFilterFormats
directly. This is more in line with the API in general, as it
allows to avoid checks for intermediate values.

Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

1 files changed, 1 insertions, 8 deletions

diff --git a/libavfilter/vf_copy.c b/libavfilter/vf_copy.c
index 16fbe438a1..0ed61324e7 100644
--- a/libavfilter/vf_copy.c
+++ b/libavfilter/vf_copy.c
@@ -29,14 +29,7 @@
 
 static int query_formats(AVFilterContext *ctx)
 {
-    AVFilterFormats *formats = NULL;
-    int ret;
-
-    ret = ff_formats_pixdesc_filter(&formats, 0,
-                                    AV_PIX_FMT_FLAG_HWACCEL);
-    if (ret < 0)
-        return ret;
-    return ff_set_common_formats(ctx, formats);
+    return ff_set_common_formats(ctx, ff_formats_pixdesc_filter(0, AV_PIX_FMT_FLAG_HWACCEL));
 }
 
 static int filter_frame(AVFilterLink *inlink, AVFrame *in)