| /****************************************************************************** |
| * |
| * 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); |
| } |
