[FFmpeg-cvslog] avfilter/palettegen: add a warning about supporting only sRGB

[Clément Bœsch]

ffmpeg | branch: master | Clément Bœsch <u at pkh.me> | Tue Dec 27 21:24:18 2022 +0100| [2441e53c0aeef4b0ec1453a295624a874dec7a6c] | committer: Clément Bœsch

avfilter/palettegen: add a warning about supporting only sRGB

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2441e53c0aeef4b0ec1453a295624a874dec7a6c
---

 libavfilter/vf_palettegen.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/libavfilter/vf_palettegen.c b/libavfilter/vf_palettegen.c
index 3178c43ab9..ba81739d27 100644
--- a/libavfilter/vf_palettegen.c
+++ b/libavfilter/vf_palettegen.c
@@ -451,9 +451,13 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 {
     AVFilterContext *ctx = inlink->dst;
     PaletteGenContext *s = ctx->priv;
-    int ret = s->prev_frame ? update_histogram_diff(s->histogram, s->prev_frame, in)
-                            : update_histogram_frame(s->histogram, in);
+    int ret;
+
+    if (in->color_trc != AVCOL_TRC_UNSPECIFIED && in->color_trc != AVCOL_TRC_IEC61966_2_1)
+        av_log(ctx, AV_LOG_WARNING, "The input frame is not in sRGB, colors may be off\n");
 
+    ret = s->prev_frame ? update_histogram_diff(s->histogram, s->prev_frame, in)
+                        : update_histogram_frame(s->histogram, in);
     if (ret > 0)
         s->nb_refs += ret;