libvpx: Pull from upstream

source/libvpx/vpx/vpx_external_frame_buffer.h

Index: source/libvpx/vpx/vpx_external_frame_buffer.h
===================================================================
--- source/libvpx/vpx/vpx_external_frame_buffer.h	(revision 0)
+++ source/libvpx/vpx/vpx_external_frame_buffer.h	(revision 0)
@@ -0,0 +1,53 @@
+/*
+ *  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 VPX_VPX_EXTERNAL_FRAME_BUFFER_H_
+#define VPX_VPX_EXTERNAL_FRAME_BUFFER_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "vpx/vpx_integer.h"
+
+/*!\brief External frame buffer
+ *
+ * This structure is used to hold external frame buffers passed into the
+ * decoder by the application.
+ */
+typedef struct vpx_codec_frame_buffer {
+  uint8_t *data;    /**< Pointer to the data buffer */
+  size_t size;      /**< Size of data in bytes */
+  void *frame_priv;  /**< Frame's private data */
+} vpx_codec_frame_buffer_t;
+
+/*!\brief realloc frame buffer callback prototype
+ *
+ * This callback is invoked by the decoder to notify the application one
+ * of the external frame buffers must increase in size, in order for the
+ * decode call to complete. The callback must allocate at least new_size in
+ * bytes and assign it to fb->data. Then the callback must set fb->size to
+ * the allocated size. The application does not need to align the allocated
+ * data. The callback is usually triggered by a frame size change. On success
+ * the callback must return 0. Any failure the callback must return a value
+ * less than 0.
+ *
+ * \param[in] user_priv    User's private data
+ * \param[in] new_size     Size in bytes needed by the buffer.
+ * \param[in/out] fb       Pointer to frame buffer to increase size.
+ */
+typedef int (*vpx_realloc_frame_buffer_cb_fn_t)(
+    void *user_priv, size_t new_size, vpx_codec_frame_buffer_t *fb);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // VPX_VPX_EXTERNAL_FRAME_BUFFER_H_