avformat/movenccenc: add support for CENC AV1 encryption

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

libavformat/cbs.h

@@ -0,0 +1,35 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFORMAT_CBS_H
+#define AVFORMAT_CBS_H
+
+#define CBS_PREFIX lavf_cbs
+#define CBS_WRITE 0
+#define CBS_TRACE 0
+#define CBS_H264 0
+#define CBS_H265 0
+#define CBS_H266 0
+#define CBS_JPEG 0
+#define CBS_MPEG2 0
+#define CBS_VP8 0
+#define CBS_VP9 0
+
+#include "libavcodec/cbs.h"
+
+#endif /* AVFORMAT_CBS_H */