avfilter/all: propagate errors of functions from avfilter/formats

Many of the functions from avfilter/formats can return errors, usually AVERROR(ENOMEM).
This propagates the return values.

All of these were found by using av_warn_unused_result, demonstrating its utility.

Tested with FATE. I am least sure of the changes to avfilter/filtergraph,
since I don't know what/how reduce_format is intended to behave and how it should
react to errors.

Fixes: CID 1325680, 1325679, 1325678.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Previous version Reviewed-by: Nicolas George <george@nsup.org>
Previous version Reviewed-by: Clément Bœsch <u@pkh.me>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/libavfilter/vf_swapuv.c b/libavfilter/vf_swapuv.c
index 624e6b624f..1a82ef3cc9 100644
--- a/libavfilter/vf_swapuv.c
+++ b/libavfilter/vf_swapuv.c
@@ -77,12 +77,12 @@ static int is_planar_yuv(const AVPixFmtDescriptor *desc)
 static int query_formats(AVFilterContext *ctx)
 {
     AVFilterFormats *formats = NULL;
-    int fmt;
+    int fmt, ret;
 
     for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
-        if (is_planar_yuv(desc))
-            ff_add_format(&formats, fmt);
+        if (is_planar_yuv(desc) && (ret = ff_add_format(&formats, fmt)) < 0)
+            return ret;
     }
 
     return ff_set_common_formats(ctx, formats);