avfilter/vf_thumbnail: switch to query_func2

Instead of enumerating a static list of planar formats to support, walk
through the format list and enable all supported formats.

As of writing, this generates the following format list:
- gbrap
- gbrap10le
- gbrap12le
- gbrap14le
- gbrap16le
- gbrp
- gbrp10le
- gbrp12le
- gbrp14le
- gbrp16le
- gbrp9le
- gray
- gray10le
- gray12le
- gray14le
- gray16le
- gray9le
- ya16le
- ya8
- yuv410p
- yuv411p
- yuv420p
- yuv420p10le
- yuv420p12le
- yuv420p14le
- yuv420p16le
- yuv420p9le
- yuv422p
- yuv422p10le
- yuv422p12le
- yuv422p14le
- yuv422p16le
- yuv422p9le
- yuv440p
- yuv440p10le
- yuv440p12le
- yuv444p
- yuv444p10le
- yuv444p12le
- yuv444p14le
- yuv444p16le
- yuv444p9le
- yuva420p
- yuva420p10le
- yuva420p16le
- yuva420p9le
- yuva422p
- yuva422p10le
- yuva422p12le
- yuva422p16le
- yuva422p9le
- yuva444p
- yuva444p10le
- yuva444p12le
- yuva444p16le
- yuva444p9le
- yuvj411p
- yuvj420p
- yuvj422p
- yuvj440p
- yuvj444p

libavfilter/vf_thumbnail.c

@@ -32,6 +32,7 @@
 #include "libavutil/pixdesc.h"
 #include "avfilter.h"
 #include "filters.h"
+#include "formats.h"
 
 #define HIST_SIZE (3*256)
 
@@ -305,23 +306,44 @@ static int config_props(AVFilterLink *inlink)
     return 0;
 }
 
-static const enum AVPixelFormat pix_fmts[] = {
+static const enum AVPixelFormat packed_rgb_fmts[] = {
     AV_PIX_FMT_RGB24, AV_PIX_FMT_BGR24,
     AV_PIX_FMT_RGBA,  AV_PIX_FMT_BGRA,
     AV_PIX_FMT_RGB0,  AV_PIX_FMT_BGR0,
     AV_PIX_FMT_ABGR,  AV_PIX_FMT_ARGB,
     AV_PIX_FMT_0BGR,  AV_PIX_FMT_0RGB,
-    AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
-    AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
-    AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
-    AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P,
-    AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P,
-    AV_PIX_FMT_YUVJ411P,
-    AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
-    AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP,
     AV_PIX_FMT_NONE
 };
 
+static int query_formats(const AVFilterContext *ctx,
+                         AVFilterFormatsConfig **cfg_in,
+                         AVFilterFormatsConfig **cfg_out)
+{
+    const AVPixFmtDescriptor *desc = NULL;
+    AVFilterFormats *formats;
+
+    formats = ff_make_format_list(packed_rgb_fmts);
+    if (!formats)
+        return AVERROR(ENOMEM);
+
+
+    while ((desc = av_pix_fmt_desc_next(desc))) {
+        int color_comps = desc->nb_components - !!(desc->flags & AV_PIX_FMT_FLAG_ALPHA);
+        if ((color_comps == 1 || (desc->flags & AV_PIX_FMT_FLAG_PLANAR)) &&
+            !(desc->flags & (AV_PIX_FMT_FLAG_FLOAT | AV_PIX_FMT_FLAG_BITSTREAM)) &&
+            (desc->comp[0].depth <= 8 || HAVE_BIGENDIAN == !!(desc->flags & AV_PIX_FMT_FLAG_BE)) &&
+            (desc->nb_components < 3 || desc->comp[1].plane != desc->comp[2].plane) &&
+            desc->comp[0].depth <= 16)
+        {
+            int ret = ff_add_format(&formats, av_pix_fmt_desc_get_id(desc));
+            if (ret < 0)
+                return ret;
+        }
+    }
+
+    return ff_set_common_formats2(ctx, cfg_in, cfg_out, formats);
+}
+
 static const AVFilterPad thumbnail_inputs[] = {
     {
         .name         = "default",
@@ -350,5 +372,5 @@ const FFFilter ff_vf_thumbnail = {
     .uninit        = uninit,
     FILTER_INPUTS(thumbnail_inputs),
     FILTER_OUTPUTS(thumbnail_outputs),
-    FILTER_PIXFMTS_ARRAY(pix_fmts),
+    FILTER_QUERY_FUNC2(query_formats),
 };