libvpx: Pull from upstream

source/libvpx/vpxstats.h

+/*
+ *  Copyright (c) 2013 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 VPXSTATS_H_
+#define VPXSTATS_H_
+
+#include <stdio.h>
+
+#include "vpx/vpx_encoder.h"
+
+/* This structure is used to abstract the different ways of handling
+ * first pass statistics
+ */
+typedef struct {
+  vpx_fixed_buf_t buf;
+  int pass;
+  FILE *file;
+  char *buf_ptr;
+  size_t buf_alloc_sz;
+} stats_io_t;
+
+int stats_open_file(stats_io_t *stats, const char *fpf, int pass);
+int stats_open_mem(stats_io_t *stats, int pass);
+void stats_close(stats_io_t *stats, int last_pass);
+void stats_write(stats_io_t *stats, const void *pkt, size_t len);
+vpx_fixed_buf_t stats_get(stats_io_t *stats);
+
+double vp8_mse2psnr(double samples, double peak, double mse);
+
+#endif  // VPXSTATS_H_