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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 */
/*****************************************************************************/
/* System include files */
#include <stdio.h>
/* User include files */
#include "irc_datatypes.h"
#include "irc_cntrl_param.h"
#include "irc_vbr_str_prms.h"
/******************************************************************************
Function Name : irc_init_vbv_str_prms
Description : Initializes and calculates the number of I frame and P frames
in the delay period
Return Values : void
*****************************************************************************/
void irc_init_vbv_str_prms(vbr_str_prms_t *p_vbr_str_prms,
UWORD32 u4_intra_frm_interval,
UWORD32 u4_src_ticks,
UWORD32 u4_tgt_ticks,
UWORD32 u4_frms_in_delay_period)
{
UWORD32 i4_num_i_frms_in_delay_per, i4_num_p_frms_in_delay_per;
p_vbr_str_prms->u4_frms_in_delay_prd = u4_frms_in_delay_period;
p_vbr_str_prms->u4_src_ticks = u4_src_ticks;
p_vbr_str_prms->u4_tgt_ticks = u4_tgt_ticks;
p_vbr_str_prms->u4_intra_frame_int = u4_intra_frm_interval;
/*
* Finding the number of I frames and P frames in delay period. This
* value along with the drain rates for the corresponding picture types will
* be used to calculate the buffer sizes
*/
i4_num_i_frms_in_delay_per = ((u4_frms_in_delay_period * u4_src_ticks)
/ (u4_intra_frm_interval * u4_tgt_ticks));
/* Ceiling the above result*/
if((i4_num_i_frms_in_delay_per * u4_intra_frm_interval * u4_tgt_ticks)
< (u4_frms_in_delay_period * u4_src_ticks))
{
i4_num_i_frms_in_delay_per++;
}
i4_num_p_frms_in_delay_per = u4_frms_in_delay_period
- i4_num_i_frms_in_delay_per;
p_vbr_str_prms->u4_num_pics_in_delay_prd[I_PIC] =
i4_num_i_frms_in_delay_per;
p_vbr_str_prms->u4_num_pics_in_delay_prd[P_PIC] =
i4_num_p_frms_in_delay_per;
p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks = (u4_intra_frm_interval
* (p_vbr_str_prms->u4_num_pics_in_delay_prd[I_PIC]))
* u4_tgt_ticks;
p_vbr_str_prms->u4_pic_num = 0;
p_vbr_str_prms->u4_cur_pos_in_src_ticks = 0;
}
WORD32 irc_get_vsp_num_pics_in_dly_prd(vbr_str_prms_t *p_vbr_str_prms,
UWORD32 *pu4_num_pics_in_delay_prd)
{
pu4_num_pics_in_delay_prd[I_PIC] =
p_vbr_str_prms->u4_num_pics_in_delay_prd[I_PIC];
pu4_num_pics_in_delay_prd[P_PIC] =
p_vbr_str_prms->u4_num_pics_in_delay_prd[P_PIC];
return (p_vbr_str_prms->u4_frms_in_delay_prd);
}
/******************************************************************************
Function Name : irc_update_vbr_str_prms
Description : update the number of I frames and P/B frames in the delay period
for buffer size calculations
*****************************************************************************/
void irc_update_vbr_str_prms(vbr_str_prms_t *p_vbr_str_prms,
picture_type_e e_pic_type)
{
/*
* Updating the number of I frames and P frames after encoding every
* picture. These values along with the drain rates for the corresponding
* picture types will be used to calculate the CBR buffer size every frame
*/
if(e_pic_type == I_PIC)
{
p_vbr_str_prms->u4_num_pics_in_delay_prd[I_PIC]--;
}
else
{
p_vbr_str_prms->u4_num_pics_in_delay_prd[P_PIC]--;
}
/* If the next I frame falls within the delay period, we need to increment
* the number of I frames in the period, else increment the number of P
* frames
*/
if((p_vbr_str_prms->u4_cur_pos_in_src_ticks
+ (p_vbr_str_prms->u4_frms_in_delay_prd
* p_vbr_str_prms->u4_src_ticks))
>= p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks)
{
p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks -=
p_vbr_str_prms->u4_cur_pos_in_src_ticks;
p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks +=
p_vbr_str_prms->u4_intra_frame_int
* p_vbr_str_prms->u4_tgt_ticks;
p_vbr_str_prms->u4_num_pics_in_delay_prd[I_PIC]++;
p_vbr_str_prms->u4_pic_num = 0;
p_vbr_str_prms->u4_cur_pos_in_src_ticks = 0;
}
else
{
p_vbr_str_prms->u4_num_pics_in_delay_prd[P_PIC]++;
}
p_vbr_str_prms->u4_pic_num++;
p_vbr_str_prms->u4_cur_pos_in_src_ticks += p_vbr_str_prms->u4_src_ticks;
}
void irc_get_vsp_src_tgt_ticks(vbr_str_prms_t *p_vbr_str_prms,
UWORD32 *pu4_src_ticks,
UWORD32 *pu4_tgt_ticks)
{
pu4_src_ticks[0] = p_vbr_str_prms->u4_src_ticks;
pu4_tgt_ticks[0] = p_vbr_str_prms->u4_tgt_ticks;
}
/*******************************************************************************
Function Name : change_vbr_str_prms
Description : Takes in changes of Intra frame interval, source and target
ticks and recalculates the position of the next I frame
******************************************************************************/
void irc_change_vsp_ifi(vbr_str_prms_t *p_vbr_str_prms,
UWORD32 u4_intra_frame_int)
{
irc_init_vbv_str_prms(p_vbr_str_prms, u4_intra_frame_int,
p_vbr_str_prms->u4_src_ticks,
p_vbr_str_prms->u4_tgt_ticks,
p_vbr_str_prms->u4_frms_in_delay_prd);
}
void irc_change_vsp_tgt_ticks(vbr_str_prms_t *p_vbr_str_prms,
UWORD32 u4_tgt_ticks)
{
UWORD32 u4_rem_intra_per_scaled;
UWORD32 u4_prev_tgt_ticks = p_vbr_str_prms->u4_tgt_ticks;
/*
* If the target frame rate is changed, recalculate the position of the next
* I frame based on the new target frame rate
* LIMITATIONS :
* Currently no support is available for dynamic change in source frame rate
*/
u4_rem_intra_per_scaled = ((p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks
- p_vbr_str_prms->u4_cur_pos_in_src_ticks)
/ u4_prev_tgt_ticks) * u4_tgt_ticks;
p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks = u4_rem_intra_per_scaled
+ p_vbr_str_prms->u4_cur_pos_in_src_ticks;
}
void irc_change_vsp_src_ticks(vbr_str_prms_t *p_vbr_str_prms,
UWORD32 u4_src_ticks)
{
irc_init_vbv_str_prms(p_vbr_str_prms, p_vbr_str_prms->u4_intra_frame_int,
u4_src_ticks, p_vbr_str_prms->u4_tgt_ticks,
p_vbr_str_prms->u4_frms_in_delay_prd);
}
void irc_change_vsp_fidp(vbr_str_prms_t *p_vbr_str_prms,
UWORD32 u4_frms_in_delay_period)
{
irc_init_vbv_str_prms(p_vbr_str_prms, p_vbr_str_prms->u4_intra_frame_int,
p_vbr_str_prms->u4_src_ticks,
p_vbr_str_prms->u4_tgt_ticks,
u4_frms_in_delay_period);
}
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