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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
*/
/*****************************************************************************/
/* Includes */
/*****************************************************************************/
/* User include files */
#include "irc_datatypes.h"
#include "irc_cntrl_param.h"
#include "irc_mem_req_and_acq.h"
#include "irc_est_sad.h"
#include "irc_common.h"
typedef struct est_sad_t
{
WORD32 i4_use_est_intra_sad;
/* Previous frame SAD */
UWORD32 au4_prev_frm_sad[MAX_PIC_TYPE];
/* Current (nth) ifi average P frame SAD */
UWORD32 u4_n_p_frm_ifi_avg_sad;
/* (n-1)th ifi average P frame SAD */
UWORD32 u4_n_1_p_frm_ifi_avg_sad;
/* (n-2)th ifi average P frame SAD */
UWORD32 u4_n_2_p_frm_ifi_avg_sad;
/* number of ifi encoded till now */
WORD32 i4_num_ifi_encoded;
/* number of P frames in the current IFI */
WORD32 i4_num_p_frm_in_cur_ifi;
} est_sad_t;
WORD32 irc_est_sad_num_fill_use_free_memtab(est_sad_t **pps_est_sad,
itt_memtab_t *ps_memtab,
ITT_FUNC_TYPE_E e_func_type)
{
WORD32 i4_mem_tab_idx = 0;
est_sad_t s_est_sad;
/* Hack for al alloc, during which we don't have any state memory.
* Dereferencing can cause issues
*/
if(e_func_type == GET_NUM_MEMTAB || e_func_type == FILL_MEMTAB)
(*pps_est_sad) = &s_est_sad;
/* For src rate control state structure */
if(e_func_type != GET_NUM_MEMTAB)
{
fill_memtab(&ps_memtab[i4_mem_tab_idx], sizeof(est_sad_t),
ALIGN_128_BYTE, PERSISTENT, DDR);
use_or_fill_base(&ps_memtab[0], (void**)pps_est_sad, e_func_type);
}
i4_mem_tab_idx++;
return (i4_mem_tab_idx);
}
void irc_init_est_sad(est_sad_t *ps_est_sad, WORD32 i4_use_est_intra_sad)
{
WORD32 i;
ps_est_sad->i4_use_est_intra_sad = i4_use_est_intra_sad;
for(i = 0; i < MAX_PIC_TYPE; i++)
{
ps_est_sad->au4_prev_frm_sad[i] = 0;
}
ps_est_sad->u4_n_p_frm_ifi_avg_sad = 0;
ps_est_sad->u4_n_1_p_frm_ifi_avg_sad = 0;
ps_est_sad->u4_n_2_p_frm_ifi_avg_sad = 0;
ps_est_sad->i4_num_ifi_encoded = 0;
ps_est_sad->i4_num_p_frm_in_cur_ifi = 0;
}
void irc_reset_est_sad(est_sad_t *ps_est_sad)
{
irc_init_est_sad(ps_est_sad, ps_est_sad->i4_use_est_intra_sad);
}
/*
* Get estimated SAD can be called at any point. The various use cases are:
* 1) When a I frame is getting encoded,
* - get the estimated of P => No issues since we use the last coded P frame
* value
* - get estimated of I => This call for two cases:
* => a) if num_ifi_encoded is less than 2
* then return the previous encoded I frame sad
* => b) if num_ifi_encoded is more than 2, then we scale
* the prev I sad by the ratio of (n-1) ifi P to n-2 ifi P
* 2) When P frame is getting encoded,
* - get the estimated of P => No issues since we use the last coded P frame value
* - get the estimated of I => Simillar to I we have two cases.
* To handle the b) case extra logic had to introduced using
* u1_is_n_1_p_frm_ifi_avg_sad_usable flag
*/
UWORD32 irc_get_est_sad(est_sad_t *ps_est_sad, picture_type_e e_pic_type)
{
if(ps_est_sad->i4_use_est_intra_sad)
{
UWORD32 u4_estimated_sad;
if(e_pic_type == P_PIC)
{
u4_estimated_sad = ps_est_sad->au4_prev_frm_sad[P_PIC];
}
else if(e_pic_type == B_PIC)
{
u4_estimated_sad = ps_est_sad->au4_prev_frm_sad[B_PIC];
}
else
{
if(ps_est_sad->i4_num_ifi_encoded < 2)
{
/*
* Only one IFI has been encoded and so use the previous I
* frames SAD
*/
u4_estimated_sad = ps_est_sad->au4_prev_frm_sad[I_PIC];
}
else
{
/*
* Since the n-1 'P' frame IFI would have just accumulated the
* frame sads we average it out here
*/
UWORD32 u4_n_1_p_frm_ifi_avg_sad, u4_n_2_p_frm_ifi_avg_sad;
number_t vq_n_1_p_frm_ifi_avg_sad, vq_n_2_p_frm_ifi_avg_sad;
number_t vq_prev_frm_sad_i;
/*
* If there are frames in the current IFI start using it to
* estimate the I frame SAD
*/
if(ps_est_sad->i4_num_p_frm_in_cur_ifi)
{
u4_n_1_p_frm_ifi_avg_sad =
(ps_est_sad->u4_n_p_frm_ifi_avg_sad
/ ps_est_sad->i4_num_p_frm_in_cur_ifi);
u4_n_2_p_frm_ifi_avg_sad =
ps_est_sad->u4_n_1_p_frm_ifi_avg_sad;
}
else
{
u4_n_1_p_frm_ifi_avg_sad =
ps_est_sad->u4_n_1_p_frm_ifi_avg_sad;
u4_n_2_p_frm_ifi_avg_sad =
ps_est_sad->u4_n_2_p_frm_ifi_avg_sad;
}
/*
* If any of the previous p frame SADs are zeros we just return
* the previous I frame SAD
*/
if(u4_n_1_p_frm_ifi_avg_sad && u4_n_2_p_frm_ifi_avg_sad)
{
SET_VAR_Q(vq_prev_frm_sad_i,
ps_est_sad->au4_prev_frm_sad[I_PIC], 0);
SET_VAR_Q(vq_n_1_p_frm_ifi_avg_sad,
u4_n_1_p_frm_ifi_avg_sad, 0);
SET_VAR_Q(vq_n_2_p_frm_ifi_avg_sad,
u4_n_2_p_frm_ifi_avg_sad, 0);
/*
* Estimated SAD =
*(n-1)th intra frame interval(ifi) P frame Avg SAD *
*(prev I frame SAD /
*(prev (n-2)nd intra frame interval(ifi) P frame Avg SAD)
*/
mult32_var_q(vq_prev_frm_sad_i, vq_n_1_p_frm_ifi_avg_sad,
&vq_prev_frm_sad_i);
div32_var_q(vq_prev_frm_sad_i, vq_n_2_p_frm_ifi_avg_sad,
&vq_prev_frm_sad_i);
number_t_to_word32(vq_prev_frm_sad_i,
(WORD32*)&u4_estimated_sad);
}
else
{
u4_estimated_sad = ps_est_sad->au4_prev_frm_sad[I_PIC];
}
}
}
return u4_estimated_sad;
}
else
{
return ps_est_sad->au4_prev_frm_sad[e_pic_type];
}
}
void irc_update_actual_sad(est_sad_t *ps_est_sad,
UWORD32 u4_actual_sad,
picture_type_e e_pic_type)
{
ps_est_sad->au4_prev_frm_sad[e_pic_type] = u4_actual_sad;
if(ps_est_sad->i4_use_est_intra_sad)
{
if(e_pic_type == I_PIC)
{
/* The requirement is to have two IFI before estimating I frame SAD */
if(ps_est_sad->i4_num_ifi_encoded < 2)
ps_est_sad->i4_num_ifi_encoded++;
/* Calculate the average SAD */
if(ps_est_sad->i4_num_p_frm_in_cur_ifi)
{
ps_est_sad->u4_n_p_frm_ifi_avg_sad /=
ps_est_sad->i4_num_p_frm_in_cur_ifi;
}
else
{
ps_est_sad->u4_n_p_frm_ifi_avg_sad = 0;
}
/* Push the (n-1)th average SAD to the (n-2)th average SAD */
ps_est_sad->u4_n_2_p_frm_ifi_avg_sad =
ps_est_sad->u4_n_1_p_frm_ifi_avg_sad;
/* Push the nth average SAD to the (n-1)th average SAD */
ps_est_sad->u4_n_1_p_frm_ifi_avg_sad =
ps_est_sad->u4_n_p_frm_ifi_avg_sad;
/* Reset SAD and number of P frames */
ps_est_sad->u4_n_p_frm_ifi_avg_sad = 0;
ps_est_sad->i4_num_p_frm_in_cur_ifi = 0;
}
else
{
ps_est_sad->u4_n_p_frm_ifi_avg_sad += u4_actual_sad;
ps_est_sad->i4_num_p_frm_in_cur_ifi++;
}
}
}
void irc_update_actual_sad_for_intra(est_sad_t *ps_est_sad,
WORD32 i4_intra_frm_cost)
{
if(!(ps_est_sad->i4_use_est_intra_sad))
{
irc_update_actual_sad(ps_est_sad, i4_intra_frm_cost, I_PIC);
}
}
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