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Change-Id: I7efe9a589cd24edf86e8d086b40c27cbbf8b4017

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+/******************************************************************************
+ *
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ *****************************************************************************
+ * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
+*/
+/**
+ *******************************************************************************
+ * @file
+ *  ime.h
+ *
+ * @brief
+ *  Contains declarations of global variables for H264 encoder
+ *
+ * @author
+ *  Ittiam
+ *
+ * @remarks
+ *
+ *******************************************************************************
+ */
+
+#ifndef IME_H_
+#define IME_H_
+
+/*****************************************************************************/
+/* Constant Macros                                                           */
+/*****************************************************************************/
+
+/**
+******************************************************************************
+ *  @brief      Number of iterations before exiting during diamond search
+******************************************************************************
+ */
+#define NUM_LAYERS 16
+
+
+/*****************************************************************************/
+/* Extern Function Declarations                                              */
+/*****************************************************************************/
+
+
+/**
+*******************************************************************************
+*
+* @brief Diamond Search
+*
+* @par Description:
+*  This function computes the sad at vertices of several layers of diamond grid
+*  at a time. The number of layers of diamond grid that would be evaluated is
+*  configurable.The function computes the sad at vertices of a diamond grid. If
+*  the sad at the center of the diamond grid is lesser than the sad at any other
+*  point of the diamond grid, the function marks the candidate Mb partition as
+*  mv.
+*
+* @param[in] ps_mb_part
+*  pointer to current mb partition ctxt with respect to ME
+*
+* @param[in] ps_me_ctxt
+*  pointer to me context
+*
+* @param[in] u4_lambda
+*  lambda motion
+*
+* @param[in] u4_fast_flag
+*  enable/disable fast sad computation
+*
+* @returns  mv pair & corresponding distortion and cost
+*
+* @remarks This module cannot be part of the final product due to its lack of
+* computational feasibility. This is only for quality eval purposes.
+*
+*******************************************************************************
+*/
+extern void ime_diamond_search_16x16(me_ctxt_t *ps_me_ctxt);
+
+
+/**
+*******************************************************************************
+*
+* @brief This function computes the best motion vector among the tentative mv
+* candidates chosen.
+*
+* @par Description:
+*  This function determines the position in the search window at which the motion
+*  estimation should begin in order to minimise the number of search iterations.
+*
+* @param[in] ps_mb_part
+*  pointer to current mb partition ctxt with respect to ME
+*
+* @param[in] u4_lambda_motion
+*  lambda motion
+*
+* @param[in] u4_fast_flag
+*  enable/disable fast sad computation
+*
+* @returns  mv pair & corresponding distortion and cost
+*
+* @remarks none
+*
+*******************************************************************************
+*/
+extern void ime_evaluate_init_srchposn_16x16
+        (
+            me_ctxt_t *ps_me_ctxt
+        );
+
+/**
+*******************************************************************************
+*
+* @brief Searches for the best matching full pixel predictor within the search
+* range
+*
+* @par Description:
+*  This function begins by computing the mv predict vector for the current mb.
+*  This is used for cost computations. Further basing on the algo. chosen, it
+*  looks through a set of candidate vectors that best represent the mb a least
+*  cost and returns this information.
+*
+* @param[in] ps_proc
+*  pointer to current proc ctxt
+*
+* @param[in] ps_me_ctxt
+*  pointer to me context
+*
+* @returns  mv pair & corresponding distortion and cost
+*
+* @remarks none
+*
+*******************************************************************************
+*/
+extern void ime_full_pel_motion_estimation_16x16
+    (
+        me_ctxt_t *ps_me_ctxt
+    );
+
+/**
+*******************************************************************************
+*
+* @brief Searches for the best matching sub pixel predictor within the search
+* range
+*
+* @par Description:
+*  This function begins by searching across all sub pixel sample points
+*  around the full pel motion vector. The vector with least cost is chosen as
+*  the mv for the current mb. If the skip mode is not evaluated while analysing
+*  the initial search candidates then analyse it here and update the mv.
+*
+* @param[in] ps_proc
+*  pointer to current proc ctxt
+*
+* @param[in] ps_me_ctxt
+*  pointer to me context
+*
+* @returns none
+*
+* @remarks none
+*
+*******************************************************************************
+*/
+extern void ime_sub_pel_motion_estimation_16x16
+    (
+        me_ctxt_t *ps_me_ctxt
+    );
+
+/**
+*******************************************************************************
+*
+* @brief This function computes cost of skip macroblocks
+*
+* @par Description:
+*
+* @param[in] ps_me_ctxt
+*  pointer to me ctxt
+*
+* @param[in] ps_skip_mv
+*  pointer to skip mv
+*
+* @returns  none
+*
+* @remarks
+* NOTE: while computing the skip cost, do not enable early exit from compute
+* sad function because, a negative bias gets added later
+*
+*******************************************************************************
+*/
+extern void ime_compute_skip_cost
+    (
+        me_ctxt_t *ps_me_ctxt,
+        void *pv_skip_mv,
+        mb_part_ctxt *ps_smb_part_info,
+        UWORD32 u4_use_stat_sad
+    );
+
+
+#endif /* IME_H_ */