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, 2 insertions, 6 deletions

diff --git a/libavfilter/vf_crop.c b/libavfilter/vf_crop.c
index 76d375cdfc..27ae1b8118 100644
--- a/libavfilter/vf_crop.c
+++ b/libavfilter/vf_crop.c
@@ -93,13 +93,9 @@ typedef struct CropContext {
 
 static int query_formats(AVFilterContext *ctx)
 {
-    AVFilterFormats *formats = NULL;
-    int ret;
+    int reject_flags = AV_PIX_FMT_FLAG_BITSTREAM | FF_PIX_FMT_FLAG_SW_FLAT_SUB;
 
-    ret = ff_formats_pixdesc_filter(&formats, 0, AV_PIX_FMT_FLAG_BITSTREAM | FF_PIX_FMT_FLAG_SW_FLAT_SUB);
-    if (ret < 0)
-        return ret;
-    return ff_set_common_formats(ctx, formats);
+    return ff_set_common_formats(ctx, ff_formats_pixdesc_filter(0, reject_flags));
 }
 
 static av_cold void uninit(AVFilterContext *ctx)