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Diffstat (limited to 'encoder/irc_vbr_str_prms.c')
| -rwxr-xr-x | encoder/irc_vbr_str_prms.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/encoder/irc_vbr_str_prms.c b/encoder/irc_vbr_str_prms.c new file mode 100755 index 0000000..29055c2 --- /dev/null +++ b/encoder/irc_vbr_str_prms.c @@ -0,0 +1,199 @@ +/****************************************************************************** + * + * 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); +} |