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+/*
+ * Copyright (c) 2016, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+/*!\defgroup aom AOM
+ * \ingroup codecs
+ * AOM is aom's newest video compression algorithm that uses motion
+ * compensated prediction, Discrete Cosine Transform (DCT) coding of the
+ * prediction error signal and context dependent entropy coding techniques
+ * based on arithmetic principles. It features:
+ *  - YUV 4:2:0 image format
+ *  - Macro-block based coding (16x16 luma plus two 8x8 chroma)
+ *  - 1/4 (1/8) pixel accuracy motion compensated prediction
+ *  - 4x4 DCT transform
+ *  - 128 level linear quantizer
+ *  - In loop deblocking filter
+ *  - Context-based entropy coding
+ *
+ * @{
+ */
+/*!\file
+ * \brief Provides controls common to both the AOM encoder and decoder.
+ */
+#ifndef AOM_AOM_AOM_H_
+#define AOM_AOM_AOM_H_
+
+#include "aom/aom_codec.h"
+#include "aom/aom_image.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*!\brief Control functions
+ *
+ * The set of macros define the control functions of AOM interface
+ * The range for common control IDs is 230-255(max).
+ */
+enum aom_com_control_id {
+  /*!\brief Codec control function to get a pointer to a reference frame
+   *
+   * av1_ref_frame_t* parameter
+   */
+  AV1_GET_REFERENCE = 230,
+
+  /*!\brief Codec control function to write a frame into a reference buffer
+   *
+   * av1_ref_frame_t* parameter
+   */
+  AV1_SET_REFERENCE = 231,
+
+  /*!\brief Codec control function to get a copy of reference frame from the
+   * decoder
+   *
+   * av1_ref_frame_t* parameter
+   */
+  AV1_COPY_REFERENCE = 232,
+
+  /*!\brief Codec control function to get a pointer to the new frame
+   *
+   * aom_image_t* parameter
+   */
+  AV1_GET_NEW_FRAME_IMAGE = 233,
+
+  /*!\brief Codec control function to copy the new frame to an external buffer
+   *
+   * aom_image_t* parameter
+   */
+  AV1_COPY_NEW_FRAME_IMAGE = 234,
+
+  /*!\brief Start point of control IDs for aom_dec_control_id.
+   * Any new common control IDs should be added above.
+   */
+  AOM_DECODER_CTRL_ID_START = 256
+  // No common control IDs should be added after AOM_DECODER_CTRL_ID_START.
+};
+
+/*!\brief AV1 specific reference frame data struct
+ *
+ * Define the data struct to access av1 reference frames.
+ */
+typedef struct av1_ref_frame {
+  int idx;              /**< frame index to get (input) */
+  int use_external_ref; /**< Directly use external ref buffer(decoder only) */
+  aom_image_t img;      /**< img structure to populate (output) */
+} av1_ref_frame_t;
+
+/*!\cond */
+/*!\brief aom decoder control function parameter type
+ *
+ * Defines the data type for each of AOM decoder control function requires.
+ *
+ * \note For each control ID "X", a macro-define of
+ * AOM_CTRL_X is provided. It is used at compile time to determine
+ * if the control ID is supported by the libaom library available,
+ * when the libaom version cannot be controlled.
+ */
+AOM_CTRL_USE_TYPE(AV1_GET_REFERENCE, av1_ref_frame_t *)
+#define AOM_CTRL_AV1_GET_REFERENCE
+
+AOM_CTRL_USE_TYPE(AV1_SET_REFERENCE, av1_ref_frame_t *)
+#define AOM_CTRL_AV1_SET_REFERENCE
+
+AOM_CTRL_USE_TYPE(AV1_COPY_REFERENCE, av1_ref_frame_t *)
+#define AOM_CTRL_AV1_COPY_REFERENCE
+
+AOM_CTRL_USE_TYPE(AV1_GET_NEW_FRAME_IMAGE, aom_image_t *)
+#define AOM_CTRL_AV1_GET_NEW_FRAME_IMAGE
+
+AOM_CTRL_USE_TYPE(AV1_COPY_NEW_FRAME_IMAGE, aom_image_t *)
+#define AOM_CTRL_AV1_COPY_NEW_FRAME_IMAGE
+
+/*!\endcond */
+/*! @} - end defgroup aom */
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // AOM_AOM_AOM_H_