avfilter/vf_lut: add support for gray formats

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavfilter/vf_lut.c

@@ -135,9 +135,13 @@ static av_cold void uninit(AVFilterContext *ctx)
     AV_PIX_FMT_GBRP16LE,     AV_PIX_FMT_GBRAP12LE,    \
     AV_PIX_FMT_GBRAP16LE
 
+#define GRAY_FORMATS                            \
+    AV_PIX_FMT_GRAY8, AV_PIX_FMT_GRAY9LE, AV_PIX_FMT_GRAY10LE, \
+    AV_PIX_FMT_GRAY12LE, AV_PIX_FMT_GRAY16LE
+
 static const enum AVPixelFormat yuv_pix_fmts[] = { YUV_FORMATS, AV_PIX_FMT_NONE };
 static const enum AVPixelFormat rgb_pix_fmts[] = { RGB_FORMATS, AV_PIX_FMT_NONE };
-static const enum AVPixelFormat all_pix_fmts[] = { RGB_FORMATS, YUV_FORMATS, AV_PIX_FMT_NONE };
+static const enum AVPixelFormat all_pix_fmts[] = { RGB_FORMATS, YUV_FORMATS, GRAY_FORMATS, AV_PIX_FMT_NONE };
 
 static int query_formats(AVFilterContext *ctx)
 {

tests/ref/fate/filter-pixfmts-lut

@@ -12,6 +12,11 @@ gbrp12le            c5a4b89571f7095eb737ad9fd6b1ee08
 gbrp14le            bdfdfd6f36c60497d1cdae791f3cc117
 gbrp16le            df095ef3a20995935cfcaf144afc68b6
 gbrp9le             a8c4e29f4cb627db81ba053e0853e702
+gray                20b14b5e26cd11300ed1249e04082170
+gray10le            8f4140b55e847cc423002b89666db5ea
+gray12le            ea89c02f6b3af49ddaf13364ed33d86d
+gray16le            aa10599924fb2440fa12b76e90f57dcb
+gray9le             7d9cc9ad6118674c547a54281d10cf05
 rgb24               a356171207723a580e7d277078072005
 rgb48le             5c7dd8575836d18c91e09f1915cf9aa9
 rgba                7bc854c2698b78af3e9159a19c2d9d21