libwebp: use a separate AVClass for each encoder

Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/libwebpenc.c

@@ -83,6 +83,13 @@ static int libwebp_encode_close(AVCodecContext *avctx)
     return ff_libwebp_encode_close_common(avctx);
 }
 
+static const AVClass class = {
+    .class_name = "libwebp",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
 AVCodec ff_libwebp_encoder = {
     .name           = "libwebp",
     .long_name      = NULL_IF_CONFIG_SMALL("libwebp WebP image"),

libavcodec/libwebpenc_animencoder.c

@@ -124,6 +124,13 @@ static int libwebp_anim_encode_close(AVCodecContext *avctx)
     return ret;
 }
 
+static const AVClass class = {
+    .class_name = "libwebp_anim",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
 AVCodec ff_libwebp_anim_encoder = {
     .name           = "libwebp_anim",
     .long_name      = NULL_IF_CONFIG_SMALL("libwebp WebP image"),

libavcodec/libwebpenc_common.h

@@ -77,14 +77,6 @@ static const AVOption options[] = {
     { NULL },
 };
 
-
-static const AVClass class = {
-    .class_name = "libwebp",
-    .item_name  = av_default_item_name,
-    .option     = options,
-    .version    = LIBAVUTIL_VERSION_INT,
-};
-
 static const AVCodecDefault libwebp_defaults[] = {
     { "compression_level",  "4"  },
     { "global_quality",     "-1" },