mirror of
https://github.com/ittiam-systems/libavc.git
synced 2026-04-02 20:30:48 +07:00
50fd862b8d
This commit does not introduce any new functionality w.r.t previous commit. But it fixes few things. They are listed below: 1. Guard Bands in header files are fixed 2. Header files contains function definition comments. These are same as in source file. Maintaining same comment at two locations is unnecessary. These are removed. 3. Improved consistency and code indentation 4. Removed comments that dont align with implementation 5. Grouped headers of a workspace together
200 lines
8 KiB
C
200 lines
8 KiB
C
/******************************************************************************
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*
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* Copyright (C) 2015 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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/* Includes */
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/*****************************************************************************/
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/* System include files */
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#include <stdio.h>
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/* User include files */
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#include "irc_datatypes.h"
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#include "irc_cntrl_param.h"
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#include "irc_vbr_str_prms.h"
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/******************************************************************************
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Function Name : irc_init_vbv_str_prms
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Description : Initializes and calculates the number of I frame and P frames
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in the delay period
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Return Values : void
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*****************************************************************************/
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void irc_init_vbv_str_prms(vbr_str_prms_t *p_vbr_str_prms,
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UWORD32 u4_intra_frm_interval,
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UWORD32 u4_src_ticks,
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UWORD32 u4_tgt_ticks,
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UWORD32 u4_frms_in_delay_period)
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{
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UWORD32 i4_num_i_frms_in_delay_per, i4_num_p_frms_in_delay_per;
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p_vbr_str_prms->u4_frms_in_delay_prd = u4_frms_in_delay_period;
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p_vbr_str_prms->u4_src_ticks = u4_src_ticks;
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p_vbr_str_prms->u4_tgt_ticks = u4_tgt_ticks;
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p_vbr_str_prms->u4_intra_frame_int = u4_intra_frm_interval;
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/*
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* Finding the number of I frames and P frames in delay period. This
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* value along with the drain rates for the corresponding picture types will
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* be used to calculate the buffer sizes
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*/
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i4_num_i_frms_in_delay_per = ((u4_frms_in_delay_period * u4_src_ticks)
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/ (u4_intra_frm_interval * u4_tgt_ticks));
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/* Ceiling the above result*/
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if((i4_num_i_frms_in_delay_per * u4_intra_frm_interval * u4_tgt_ticks)
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< (u4_frms_in_delay_period * u4_src_ticks))
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{
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i4_num_i_frms_in_delay_per++;
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}
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i4_num_p_frms_in_delay_per = u4_frms_in_delay_period
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- i4_num_i_frms_in_delay_per;
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p_vbr_str_prms->u4_num_pics_in_delay_prd[I_PIC] =
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i4_num_i_frms_in_delay_per;
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p_vbr_str_prms->u4_num_pics_in_delay_prd[P_PIC] =
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i4_num_p_frms_in_delay_per;
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p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks = (u4_intra_frm_interval
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* (p_vbr_str_prms->u4_num_pics_in_delay_prd[I_PIC]))
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* u4_tgt_ticks;
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p_vbr_str_prms->u4_pic_num = 0;
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p_vbr_str_prms->u4_cur_pos_in_src_ticks = 0;
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}
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WORD32 irc_get_vsp_num_pics_in_dly_prd(vbr_str_prms_t *p_vbr_str_prms,
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UWORD32 *pu4_num_pics_in_delay_prd)
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{
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pu4_num_pics_in_delay_prd[I_PIC] =
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p_vbr_str_prms->u4_num_pics_in_delay_prd[I_PIC];
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pu4_num_pics_in_delay_prd[P_PIC] =
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p_vbr_str_prms->u4_num_pics_in_delay_prd[P_PIC];
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return (p_vbr_str_prms->u4_frms_in_delay_prd);
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}
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/******************************************************************************
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Function Name : irc_update_vbr_str_prms
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Description : update the number of I frames and P/B frames in the delay period
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for buffer size calculations
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*****************************************************************************/
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void irc_update_vbr_str_prms(vbr_str_prms_t *p_vbr_str_prms,
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picture_type_e e_pic_type)
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{
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/*
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* Updating the number of I frames and P frames after encoding every
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* picture. These values along with the drain rates for the corresponding
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* picture types will be used to calculate the CBR buffer size every frame
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*/
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if(e_pic_type == I_PIC)
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{
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p_vbr_str_prms->u4_num_pics_in_delay_prd[I_PIC]--;
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}
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else
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{
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p_vbr_str_prms->u4_num_pics_in_delay_prd[P_PIC]--;
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}
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/* If the next I frame falls within the delay period, we need to increment
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* the number of I frames in the period, else increment the number of P
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* frames
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*/
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if((p_vbr_str_prms->u4_cur_pos_in_src_ticks
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+ (p_vbr_str_prms->u4_frms_in_delay_prd
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* p_vbr_str_prms->u4_src_ticks))
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>= p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks)
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{
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p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks -=
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p_vbr_str_prms->u4_cur_pos_in_src_ticks;
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p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks +=
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p_vbr_str_prms->u4_intra_frame_int
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* p_vbr_str_prms->u4_tgt_ticks;
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p_vbr_str_prms->u4_num_pics_in_delay_prd[I_PIC]++;
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p_vbr_str_prms->u4_pic_num = 0;
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p_vbr_str_prms->u4_cur_pos_in_src_ticks = 0;
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}
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else
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{
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p_vbr_str_prms->u4_num_pics_in_delay_prd[P_PIC]++;
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}
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p_vbr_str_prms->u4_pic_num++;
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p_vbr_str_prms->u4_cur_pos_in_src_ticks += p_vbr_str_prms->u4_src_ticks;
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}
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void irc_get_vsp_src_tgt_ticks(vbr_str_prms_t *p_vbr_str_prms,
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UWORD32 *pu4_src_ticks,
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UWORD32 *pu4_tgt_ticks)
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{
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pu4_src_ticks[0] = p_vbr_str_prms->u4_src_ticks;
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pu4_tgt_ticks[0] = p_vbr_str_prms->u4_tgt_ticks;
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}
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/*******************************************************************************
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Function Name : change_vbr_str_prms
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Description : Takes in changes of Intra frame interval, source and target
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ticks and recalculates the position of the next I frame
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******************************************************************************/
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void irc_change_vsp_ifi(vbr_str_prms_t *p_vbr_str_prms,
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UWORD32 u4_intra_frame_int)
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{
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irc_init_vbv_str_prms(p_vbr_str_prms, u4_intra_frame_int,
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p_vbr_str_prms->u4_src_ticks,
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p_vbr_str_prms->u4_tgt_ticks,
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p_vbr_str_prms->u4_frms_in_delay_prd);
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}
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void irc_change_vsp_tgt_ticks(vbr_str_prms_t *p_vbr_str_prms,
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UWORD32 u4_tgt_ticks)
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{
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UWORD32 u4_rem_intra_per_scaled;
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UWORD32 u4_prev_tgt_ticks = p_vbr_str_prms->u4_tgt_ticks;
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/*
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* If the target frame rate is changed, recalculate the position of the next
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* I frame based on the new target frame rate
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* LIMITATIONS :
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* Currently no support is available for dynamic change in source frame rate
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*/
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u4_rem_intra_per_scaled = ((p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks
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- p_vbr_str_prms->u4_cur_pos_in_src_ticks)
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/ u4_prev_tgt_ticks) * u4_tgt_ticks;
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p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks = u4_rem_intra_per_scaled
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+ p_vbr_str_prms->u4_cur_pos_in_src_ticks;
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}
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void irc_change_vsp_src_ticks(vbr_str_prms_t *p_vbr_str_prms,
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UWORD32 u4_src_ticks)
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{
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irc_init_vbv_str_prms(p_vbr_str_prms, p_vbr_str_prms->u4_intra_frame_int,
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u4_src_ticks, p_vbr_str_prms->u4_tgt_ticks,
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p_vbr_str_prms->u4_frms_in_delay_prd);
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}
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void irc_change_vsp_fidp(vbr_str_prms_t *p_vbr_str_prms,
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UWORD32 u4_frms_in_delay_period)
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{
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irc_init_vbv_str_prms(p_vbr_str_prms, p_vbr_str_prms->u4_intra_frame_int,
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p_vbr_str_prms->u4_src_ticks,
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p_vbr_str_prms->u4_tgt_ticks,
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u4_frms_in_delay_period);
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}
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