avfilter/vf_hflip: Remove empty options and AVClass

This filter only had an AVClass and empty options because up until
recently, avfilter_init_str() errored out when options were provided
for a filter without an AVClass. But setting (generic) options is
necessary to take advantage of timeline support. So with
avfilter_init_str() fixed, the AVClass and the options can be removed.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavfilter/hflip.h

@@ -22,10 +22,9 @@
 #ifndef AVFILTER_HFLIP_H
 #define AVFILTER_HFLIP_H
 
-#include "avfilter.h"
+#include <stdint.h>
 
 typedef struct FlipContext {
-    const AVClass *class;
     int max_step[4];    ///< max pixel step for each plane, expressed as a number of bytes
     int bayer_plus1;    ///< 1 .. not a Bayer input format, 2 .. Bayer input format
     int planewidth[4];  ///< width of each plane

libavfilter/vf_hflip.c

@@ -26,7 +26,6 @@
 
 #include <string.h>
 
-#include "libavutil/opt.h"
 #include "avfilter.h"
 #include "formats.h"
 #include "hflip.h"
@@ -38,12 +37,6 @@
 #include "libavutil/intreadwrite.h"
 #include "libavutil/imgutils.h"
 
-static const AVOption hflip_options[] = {
-    { NULL }
-};
-
-AVFILTER_DEFINE_CLASS(hflip);
-
 static int query_formats(AVFilterContext *ctx)
 {
     AVFilterFormats *pix_fmts = NULL;
@@ -155,7 +148,6 @@ const AVFilter ff_vf_hflip = {
     .name          = "hflip",
     .description   = NULL_IF_CONFIG_SMALL("Horizontally flip the input video."),
     .priv_size     = sizeof(FlipContext),
-    .priv_class    = &hflip_class,
     FILTER_INPUTS(avfilter_vf_hflip_inputs),
     FILTER_OUTPUTS(ff_video_default_filterpad),
     FILTER_QUERY_FUNC(query_formats),

libavfilter/vf_hflip_init.h

@@ -26,6 +26,7 @@
 
 #include "config.h"
 #include "libavutil/attributes.h"
+#include "libavutil/error.h"
 #include "libavutil/intreadwrite.h"
 #include "hflip.h"