Hamsalekha S | 8d3d303 | 2015-03-13 21:24:58 +0530 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Copyright (C) 2015 The Android Open Source Project |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at: |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | * |
| 17 | ***************************************************************************** |
| 18 | * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore |
| 19 | */ |
| 20 | /*****************************************************************************/ |
| 21 | /* Includes */ |
| 22 | /*****************************************************************************/ |
| 23 | |
| 24 | /* System include files */ |
| 25 | #include <stdio.h> |
| 26 | |
| 27 | /* User include files */ |
| 28 | #include "irc_datatypes.h" |
| 29 | #include "irc_cntrl_param.h" |
| 30 | #include "irc_vbr_str_prms.h" |
| 31 | |
| 32 | /****************************************************************************** |
| 33 | Function Name : irc_init_vbv_str_prms |
| 34 | Description : Initializes and calculates the number of I frame and P frames |
| 35 | in the delay period |
| 36 | Return Values : void |
| 37 | *****************************************************************************/ |
| 38 | void irc_init_vbv_str_prms(vbr_str_prms_t *p_vbr_str_prms, |
| 39 | UWORD32 u4_intra_frm_interval, |
| 40 | UWORD32 u4_src_ticks, |
| 41 | UWORD32 u4_tgt_ticks, |
| 42 | UWORD32 u4_frms_in_delay_period) |
| 43 | { |
| 44 | |
| 45 | UWORD32 i4_num_i_frms_in_delay_per, i4_num_p_frms_in_delay_per; |
| 46 | |
| 47 | p_vbr_str_prms->u4_frms_in_delay_prd = u4_frms_in_delay_period; |
| 48 | p_vbr_str_prms->u4_src_ticks = u4_src_ticks; |
| 49 | p_vbr_str_prms->u4_tgt_ticks = u4_tgt_ticks; |
| 50 | p_vbr_str_prms->u4_intra_frame_int = u4_intra_frm_interval; |
| 51 | |
| 52 | /* |
| 53 | * Finding the number of I frames and P frames in delay period. This |
| 54 | * value along with the drain rates for the corresponding picture types will |
| 55 | * be used to calculate the buffer sizes |
| 56 | */ |
| 57 | i4_num_i_frms_in_delay_per = ((u4_frms_in_delay_period * u4_src_ticks) |
| 58 | / (u4_intra_frm_interval * u4_tgt_ticks)); |
| 59 | |
| 60 | /* Ceiling the above result*/ |
| 61 | if((i4_num_i_frms_in_delay_per * u4_intra_frm_interval * u4_tgt_ticks) |
| 62 | < (u4_frms_in_delay_period * u4_src_ticks)) |
| 63 | { |
| 64 | i4_num_i_frms_in_delay_per++; |
| 65 | |
| 66 | } |
| 67 | i4_num_p_frms_in_delay_per = u4_frms_in_delay_period |
| 68 | - i4_num_i_frms_in_delay_per; |
| 69 | |
| 70 | p_vbr_str_prms->u4_num_pics_in_delay_prd[I_PIC] = |
| 71 | i4_num_i_frms_in_delay_per; |
| 72 | p_vbr_str_prms->u4_num_pics_in_delay_prd[P_PIC] = |
| 73 | i4_num_p_frms_in_delay_per; |
| 74 | p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks = (u4_intra_frm_interval |
| 75 | * (p_vbr_str_prms->u4_num_pics_in_delay_prd[I_PIC])) |
| 76 | * u4_tgt_ticks; |
| 77 | p_vbr_str_prms->u4_pic_num = 0; |
| 78 | p_vbr_str_prms->u4_cur_pos_in_src_ticks = 0; |
| 79 | } |
| 80 | |
| 81 | WORD32 irc_get_vsp_num_pics_in_dly_prd(vbr_str_prms_t *p_vbr_str_prms, |
| 82 | UWORD32 *pu4_num_pics_in_delay_prd) |
| 83 | { |
| 84 | pu4_num_pics_in_delay_prd[I_PIC] = |
| 85 | p_vbr_str_prms->u4_num_pics_in_delay_prd[I_PIC]; |
| 86 | pu4_num_pics_in_delay_prd[P_PIC] = |
| 87 | p_vbr_str_prms->u4_num_pics_in_delay_prd[P_PIC]; |
| 88 | return (p_vbr_str_prms->u4_frms_in_delay_prd); |
| 89 | } |
| 90 | |
| 91 | /****************************************************************************** |
| 92 | Function Name : irc_update_vbr_str_prms |
| 93 | Description : update the number of I frames and P/B frames in the delay period |
| 94 | for buffer size calculations |
| 95 | *****************************************************************************/ |
| 96 | void irc_update_vbr_str_prms(vbr_str_prms_t *p_vbr_str_prms, |
| 97 | picture_type_e e_pic_type) |
| 98 | { |
| 99 | /* |
| 100 | * Updating the number of I frames and P frames after encoding every |
| 101 | * picture. These values along with the drain rates for the corresponding |
| 102 | * picture types will be used to calculate the CBR buffer size every frame |
| 103 | */ |
| 104 | |
| 105 | if(e_pic_type == I_PIC) |
| 106 | { |
| 107 | p_vbr_str_prms->u4_num_pics_in_delay_prd[I_PIC]--; |
| 108 | } |
| 109 | else |
| 110 | { |
| 111 | p_vbr_str_prms->u4_num_pics_in_delay_prd[P_PIC]--; |
| 112 | } |
| 113 | |
| 114 | /* If the next I frame falls within the delay period, we need to increment |
| 115 | * the number of I frames in the period, else increment the number of P |
| 116 | * frames |
| 117 | */ |
| 118 | if((p_vbr_str_prms->u4_cur_pos_in_src_ticks |
| 119 | + (p_vbr_str_prms->u4_frms_in_delay_prd |
| 120 | * p_vbr_str_prms->u4_src_ticks)) |
| 121 | >= p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks) |
| 122 | { |
| 123 | p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks -= |
| 124 | p_vbr_str_prms->u4_cur_pos_in_src_ticks; |
| 125 | p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks += |
| 126 | p_vbr_str_prms->u4_intra_frame_int |
| 127 | * p_vbr_str_prms->u4_tgt_ticks; |
| 128 | p_vbr_str_prms->u4_num_pics_in_delay_prd[I_PIC]++; |
| 129 | p_vbr_str_prms->u4_pic_num = 0; |
| 130 | p_vbr_str_prms->u4_cur_pos_in_src_ticks = 0; |
| 131 | } |
| 132 | else |
| 133 | { |
| 134 | p_vbr_str_prms->u4_num_pics_in_delay_prd[P_PIC]++; |
| 135 | } |
| 136 | p_vbr_str_prms->u4_pic_num++; |
| 137 | p_vbr_str_prms->u4_cur_pos_in_src_ticks += p_vbr_str_prms->u4_src_ticks; |
| 138 | } |
| 139 | |
| 140 | void irc_get_vsp_src_tgt_ticks(vbr_str_prms_t *p_vbr_str_prms, |
| 141 | UWORD32 *pu4_src_ticks, |
| 142 | UWORD32 *pu4_tgt_ticks) |
| 143 | { |
| 144 | pu4_src_ticks[0] = p_vbr_str_prms->u4_src_ticks; |
| 145 | pu4_tgt_ticks[0] = p_vbr_str_prms->u4_tgt_ticks; |
| 146 | } |
| 147 | |
| 148 | /******************************************************************************* |
| 149 | Function Name : change_vbr_str_prms |
| 150 | Description : Takes in changes of Intra frame interval, source and target |
| 151 | ticks and recalculates the position of the next I frame |
| 152 | ******************************************************************************/ |
| 153 | void irc_change_vsp_ifi(vbr_str_prms_t *p_vbr_str_prms, |
| 154 | UWORD32 u4_intra_frame_int) |
| 155 | { |
| 156 | irc_init_vbv_str_prms(p_vbr_str_prms, u4_intra_frame_int, |
| 157 | p_vbr_str_prms->u4_src_ticks, |
| 158 | p_vbr_str_prms->u4_tgt_ticks, |
| 159 | p_vbr_str_prms->u4_frms_in_delay_prd); |
| 160 | } |
| 161 | |
| 162 | void irc_change_vsp_tgt_ticks(vbr_str_prms_t *p_vbr_str_prms, |
| 163 | UWORD32 u4_tgt_ticks) |
| 164 | { |
| 165 | UWORD32 u4_rem_intra_per_scaled; |
| 166 | UWORD32 u4_prev_tgt_ticks = p_vbr_str_prms->u4_tgt_ticks; |
| 167 | |
| 168 | /* |
| 169 | * If the target frame rate is changed, recalculate the position of the next |
| 170 | * I frame based on the new target frame rate |
| 171 | * LIMITATIONS : |
| 172 | * Currently no support is available for dynamic change in source frame rate |
| 173 | */ |
| 174 | |
| 175 | u4_rem_intra_per_scaled = ((p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks |
| 176 | - p_vbr_str_prms->u4_cur_pos_in_src_ticks) |
| 177 | / u4_prev_tgt_ticks) * u4_tgt_ticks; |
| 178 | |
| 179 | p_vbr_str_prms->u4_intra_prd_pos_in_tgt_ticks = u4_rem_intra_per_scaled |
| 180 | + p_vbr_str_prms->u4_cur_pos_in_src_ticks; |
| 181 | |
| 182 | } |
| 183 | |
| 184 | void irc_change_vsp_src_ticks(vbr_str_prms_t *p_vbr_str_prms, |
| 185 | UWORD32 u4_src_ticks) |
| 186 | { |
| 187 | irc_init_vbv_str_prms(p_vbr_str_prms, p_vbr_str_prms->u4_intra_frame_int, |
| 188 | u4_src_ticks, p_vbr_str_prms->u4_tgt_ticks, |
| 189 | p_vbr_str_prms->u4_frms_in_delay_prd); |
| 190 | } |
| 191 | |
| 192 | void irc_change_vsp_fidp(vbr_str_prms_t *p_vbr_str_prms, |
| 193 | UWORD32 u4_frms_in_delay_period) |
| 194 | { |
| 195 | irc_init_vbv_str_prms(p_vbr_str_prms, p_vbr_str_prms->u4_intra_frame_int, |
| 196 | p_vbr_str_prms->u4_src_ticks, |
| 197 | p_vbr_str_prms->u4_tgt_ticks, |
| 198 | u4_frms_in_delay_period); |
| 199 | } |