libvpx: Add VP9 decoder.

source/libvpx/vp9/common/vp9_header.h

+/*
+ *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+#ifndef VP9_COMMON_VP9_HEADER_H_
+#define VP9_COMMON_VP9_HEADER_H_
+
+/* 24 bits total */
+typedef struct {
+  unsigned int type: 1;
+  unsigned int version: 3;
+  unsigned int show_frame: 1;
+
+  /* Allow 2^20 bytes = 8 megabits for first partition */
+
+  unsigned int first_partition_length_in_bytes: 19;
+
+#ifdef PACKET_TESTING
+  unsigned int frame_number;
+  unsigned int update_gold: 1;
+  unsigned int uses_gold: 1;
+  unsigned int update_last: 1;
+  unsigned int uses_last: 1;
+#endif
+
+} VP9_HEADER;
+
+#ifdef PACKET_TESTING
+#define VP9_HEADER_SIZE 8
+#else
+#define VP9_HEADER_SIZE 3
+#endif
+
+
+#endif