/******************************************************************************
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*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*****************************************************************************
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* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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*/
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/*!
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******************************************************************************
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* \file mb_model_based.c
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*
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* \brief
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* This file contain mb level API functions
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*
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* \date
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*
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* \author
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* ittiam
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*
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******************************************************************************
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*/
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/*****************************************************************************/
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/* File Includes */
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/*****************************************************************************/
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/* User include files */
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#include "ittiam_datatypes.h"
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#include "rc_common.h"
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#include "rc_cntrl_param.h"
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#include "var_q_operator.h"
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#include "mem_req_and_acq.h"
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#include "mb_model_based.h"
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typedef struct mb_rate_control_t
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{
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/* Frame Qp */
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UWORD8 u1_frm_qp;
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/* Estimated average activity for the current frame (updated with the previous
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frame activity since it is independent of picture type whether it is I or P) */
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WORD32 i4_avg_activity;
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} mb_rate_control_t;
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WORD32 mbrc_num_fill_use_free_memtab(
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mb_rate_control_t **pps_mb_rate_control, itt_memtab_t *ps_memtab, ITT_FUNC_TYPE_E e_func_type)
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{
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WORD32 i4_mem_tab_idx = 0;
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static mb_rate_control_t s_mb_rate_control_temp;
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/* Hack for al alloc, during which we dont have any state memory.
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Dereferencing can cause issues */
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if(e_func_type == GET_NUM_MEMTAB || e_func_type == FILL_MEMTAB)
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(*pps_mb_rate_control) = &s_mb_rate_control_temp;
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/*for src rate control state structure*/
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if(e_func_type != GET_NUM_MEMTAB)
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{
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fill_memtab(
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&ps_memtab[i4_mem_tab_idx],
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sizeof(mb_rate_control_t),
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MEM_TAB_ALIGNMENT,
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PERSISTENT,
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DDR);
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use_or_fill_base(&ps_memtab[0], (void **)pps_mb_rate_control, e_func_type);
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}
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i4_mem_tab_idx++;
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return (i4_mem_tab_idx);
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}
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/********************************************************************************
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MB LEVEL API FUNCTIONS
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********************************************************************************/
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/******************************************************************************
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Function Name : init_mb_level_rc
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Description : Initialise the mb model and the average activity to default values
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Arguments :
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Return Values : void
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Revision History:
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13 03 2008 KJN Creation
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*********************************************************************************/
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void init_mb_level_rc(mb_rate_control_t *ps_mb_rate_control)
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{
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/* Set values to default */
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ps_mb_rate_control->i4_avg_activity = 0;
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}
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/******************************************************************************
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Function Name : mb_init_frame_level
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Description : Initialise the mb state with frame level decisions
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Arguments : u1_frame_qp - Frame level qp
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Return Values : void
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Revision History:
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13 03 2008 KJN Creation
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*********************************************************************************/
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void mb_init_frame_level(mb_rate_control_t *ps_mb_rate_control, UWORD8 u1_frame_qp)
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{
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/* Update frame level QP */
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ps_mb_rate_control->u1_frm_qp = u1_frame_qp;
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}
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/******************************************************************************
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Function Name : reset_mb_activity
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Description : Reset the mb activity - Whenever there is SCD
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the mb activity is reset
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Arguments :
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Return Values : void
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Revision History:
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13 03 2008 KJN Creation
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*********************************************************************************/
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void reset_mb_activity(mb_rate_control_t *ps_mb_rate_control)
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{
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ps_mb_rate_control->i4_avg_activity = 0;
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}
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/******************************************************************************
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Function Name : get_mb_qp
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Description : Calculates the mb level qp
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Arguments : i4_cur_mb_activity - current frame mb activity
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pi4_mb_qp - Array of 2 values for before and after mb activity
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modulation
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Return Values : void
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Revision History:
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13 03 2008 KJN Creation
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*********************************************************************************/
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void get_mb_qp(mb_rate_control_t *ps_mb_rate_control, WORD32 i4_cur_mb_activity, WORD32 *pi4_mb_qp)
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{
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WORD32 i4_qp;
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/* Initialise the mb level qp with the frame level qp */
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i4_qp = ps_mb_rate_control->u1_frm_qp;
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/* Store the model based QP - This is used for updating the rate control model */
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pi4_mb_qp[0] = i4_qp;
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/* Modulate the Qp based on the activity */
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if((ps_mb_rate_control->i4_avg_activity) && (i4_qp < 100))
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{
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i4_qp = ((((2 * i4_cur_mb_activity)) + ps_mb_rate_control->i4_avg_activity) * i4_qp +
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((i4_cur_mb_activity + 2 * ps_mb_rate_control->i4_avg_activity) >> 1)) /
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(i4_cur_mb_activity + 2 * ps_mb_rate_control->i4_avg_activity);
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if(i4_qp > ((3 * ps_mb_rate_control->u1_frm_qp) >> 1))
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i4_qp = ((3 * ps_mb_rate_control->u1_frm_qp) >> 1);
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}
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/* Store the qp modulated by mb activity - This is used for encoding the MB */
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pi4_mb_qp[1] = i4_qp;
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}
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/******************************************************************************
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Function Name : get_frm_level_qp
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Description : Returns the stored frame level QP
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Arguments :
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Revision History:
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13 03 2008 KJN Creation
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*********************************************************************************/
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UWORD8 get_frm_level_qp(mb_rate_control_t *ps_mb_rate_control)
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{
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return (ps_mb_rate_control->u1_frm_qp);
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}
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/******************************************************************************
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Function Name : mb_update_frame_level
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Description : Update the frame level info collected
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Arguments : i4_avg_activity - Average activity fot frame
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Return Values :
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Revision History:
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13 03 2008 KJN Creation
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*********************************************************************************/
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void mb_update_frame_level(mb_rate_control_t *ps_mb_rate_control, WORD32 i4_avg_activity)
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{
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/*****************************************************************************
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Update the Average Activity
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*****************************************************************************/
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ps_mb_rate_control->i4_avg_activity = i4_avg_activity;
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}
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