| /****************************************************************************** |
| * |
| * 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 */ |
| #include <stdio.h> |
| #include <string.h> |
| #include "irc_datatypes.h" |
| #include "irc_mem_req_and_acq.h" |
| #include "irc_common.h" |
| #include "irc_cntrl_param.h" |
| #include "irc_fixed_point_error_bits.h" |
| #include "irc_rd_model.h" |
| #include "irc_est_sad.h" |
| #include "irc_picture_type.h" |
| #include "irc_bit_allocation.h" |
| #include "irc_trace_support.h" |
| |
| /** Macros **/ |
| #define MIN(x,y) ((x) < (y))? (x) : (y) |
| |
| /* State structure for bit allocation */ |
| typedef struct |
| { |
| /* using var_q number as it can cross 31 bits for large intra frameinterval */ |
| number_t vq_rem_bits_in_period; |
| |
| /* Storing inputs */ |
| WORD32 i4_tot_frms_in_gop; |
| |
| WORD32 i4_num_intra_frm_interval; |
| |
| WORD32 i4_bits_per_frm; |
| |
| } rem_bit_in_prd_t; |
| |
| typedef struct bit_allocation_t |
| { |
| rem_bit_in_prd_t s_rbip; |
| |
| /* A universal constant giving the relative complexity between pictures */ |
| WORD32 i2_K[MAX_PIC_TYPE]; |
| |
| /* To get a estimate of the header bits consumed */ |
| WORD32 i4_prev_frm_header_bits[MAX_PIC_TYPE]; |
| |
| WORD32 i4_bits_per_frm; |
| |
| WORD32 i4_num_gops_in_period; |
| |
| /* Num gops as set by rate control module */ |
| WORD32 i4_actual_num_gops_in_period; |
| |
| number_t vq_saved_bits; |
| |
| WORD32 i4_max_bits_per_frm[MAX_NUM_DRAIN_RATES]; |
| |
| WORD32 i4_min_bits_per_frm; |
| |
| /* Error bits module */ |
| error_bits_handle ps_error_bits; |
| |
| /* Storing frame rate */ |
| WORD32 i4_frame_rate; |
| |
| WORD32 i4_bit_rate; |
| |
| WORD32 ai4_peak_bit_rate[MAX_NUM_DRAIN_RATES]; |
| |
| } bit_allocation_t; |
| |
| static WORD32 get_number_of_frms_in_a_gop(pic_handling_handle ps_pic_handling) |
| { |
| WORD32 i4_tot_frms_in_gop = 0, i; |
| WORD32 ai4_frms_in_gop[MAX_PIC_TYPE]; |
| |
| /* Query the pic_handling struct for the rem frames in the period */ |
| irc_pic_type_get_frms_in_gop(ps_pic_handling, ai4_frms_in_gop); |
| |
| /* Get the total frms in the gop */ |
| i4_tot_frms_in_gop = 0; |
| for(i = 0; i < MAX_PIC_TYPE; i++) |
| { |
| i4_tot_frms_in_gop += ai4_frms_in_gop[i]; |
| } |
| return (i4_tot_frms_in_gop); |
| } |
| |
| static void init_rbip(rem_bit_in_prd_t *ps_rbip, |
| pic_handling_handle ps_pic_handling, |
| WORD32 i4_bits_per_frm, |
| WORD32 i4_num_intra_frm_interval) |
| { |
| WORD32 i4_tot_frms_in_gop = get_number_of_frms_in_a_gop(ps_pic_handling); |
| |
| /* rem_bits_in_period = bits_per_frm * tot_frms_in_gop * num_intra_frm_interval */ |
| { |
| number_t vq_bits_per_frm, vq_tot_frms_in_gop, vq_num_intra_frm_interval; |
| number_t *pvq_rem_bits_in_period = &ps_rbip->vq_rem_bits_in_period; |
| |
| SET_VAR_Q(vq_bits_per_frm, i4_bits_per_frm, 0); |
| SET_VAR_Q(vq_tot_frms_in_gop, i4_tot_frms_in_gop, 0); |
| SET_VAR_Q(vq_num_intra_frm_interval, i4_num_intra_frm_interval, 0); |
| |
| /* rem_bits_in_period = bits_per_frm * tot_frms_in_gop */ |
| mult32_var_q(vq_bits_per_frm, vq_tot_frms_in_gop, |
| pvq_rem_bits_in_period); |
| |
| /* rem_bits_in_period *= num_intra_frm_interval */ |
| mult32_var_q(vq_num_intra_frm_interval, pvq_rem_bits_in_period[0], |
| pvq_rem_bits_in_period); |
| } |
| |
| /* |
| * Store the total number of frames in GOP value which is |
| * used from module A |
| */ |
| ps_rbip->i4_tot_frms_in_gop = i4_tot_frms_in_gop; |
| ps_rbip->i4_num_intra_frm_interval = i4_num_intra_frm_interval; |
| ps_rbip->i4_bits_per_frm = i4_bits_per_frm; |
| } |
| |
| static void check_update_rbip(rem_bit_in_prd_t *ps_rbip, |
| pic_handling_handle ps_pic_handling) |
| { |
| /* |
| * NOTE: Intra frame interval changes after the first I frame that is |
| * encoded in a GOP |
| */ |
| WORD32 i4_new_tot_frms_in_gop = get_number_of_frms_in_a_gop( |
| ps_pic_handling); |
| |
| if(i4_new_tot_frms_in_gop != ps_rbip->i4_tot_frms_in_gop) |
| { |
| WORD32 i4_rem_frames_in_period = |
| ps_rbip->i4_num_intra_frm_interval |
| * (i4_new_tot_frms_in_gop |
| - ps_rbip->i4_tot_frms_in_gop); |
| |
| number_t vq_rem_frms_in_period, s_bits_per_frm, vq_delta_bits_in_period; |
| |
| SET_VAR_Q(vq_rem_frms_in_period, i4_rem_frames_in_period, 0); |
| SET_VAR_Q(s_bits_per_frm, ps_rbip->i4_bits_per_frm, 0); |
| |
| /* delta_bits_in_period = bits_per_frm * rem_frms_in_period */ |
| mult32_var_q(s_bits_per_frm, vq_rem_frms_in_period, |
| &vq_delta_bits_in_period); |
| |
| /* rem_bits_in_period += delta_bits_in_period */ |
| add32_var_q(vq_delta_bits_in_period, ps_rbip->vq_rem_bits_in_period, |
| &ps_rbip->vq_rem_bits_in_period); |
| } |
| /* Updated the new values */ |
| ps_rbip->i4_tot_frms_in_gop = i4_new_tot_frms_in_gop; |
| } |
| |
| static void irc_ba_update_rbip(rem_bit_in_prd_t *ps_rbip, |
| pic_handling_handle ps_pic_handling, |
| WORD32 i4_num_of_bits) |
| { |
| number_t vq_num_bits; |
| |
| check_update_rbip(ps_rbip, ps_pic_handling); |
| |
| /* rem_bits_in_period += num_of_bits */ |
| SET_VAR_Q(vq_num_bits, i4_num_of_bits, 0); |
| add32_var_q(vq_num_bits, ps_rbip->vq_rem_bits_in_period, |
| &ps_rbip->vq_rem_bits_in_period); |
| } |
| |
| static void irc_ba_change_rbip(rem_bit_in_prd_t *ps_rbip, |
| pic_handling_handle ps_pic_handling, |
| WORD32 i4_new_bits_per_frm, |
| WORD32 i4_new_num_intra_frm_interval) |
| { |
| WORD32 ai4_rem_frms_in_period[MAX_PIC_TYPE], i4_rem_frms_in_gop, i; |
| irc_pic_type_get_rem_frms_in_gop(ps_pic_handling, ai4_rem_frms_in_period); |
| |
| i4_rem_frms_in_gop = 0; |
| for(i = 0; i < MAX_PIC_TYPE; i++) |
| i4_rem_frms_in_gop += ai4_rem_frms_in_period[i]; |
| |
| if(i4_new_bits_per_frm != ps_rbip->i4_bits_per_frm) |
| { |
| WORD32 i4_rem_frms_in_period = (ps_rbip->i4_num_intra_frm_interval - 1) |
| * ps_rbip->i4_tot_frms_in_gop + i4_rem_frms_in_gop; |
| |
| number_t vq_rem_frms_in_period, vq_delta_bits_per_frm, |
| vq_delta_bits_in_period; |
| |
| /* delta_bits_per_frm = new_bits_per_frm - old_bits_per_frm */ |
| SET_VAR_Q(vq_delta_bits_per_frm, |
| (i4_new_bits_per_frm - ps_rbip->i4_bits_per_frm), 0); |
| |
| SET_VAR_Q(vq_rem_frms_in_period, i4_rem_frms_in_period, 0); |
| |
| /* delta_bits_in_period = delta_bits_per_frm * rem_frms_in_period */ |
| mult32_var_q(vq_delta_bits_per_frm, vq_rem_frms_in_period, |
| &vq_delta_bits_in_period); |
| |
| /* ps_rbip->rem_bits_in_period += delta_bits_in_period */ |
| add32_var_q(vq_delta_bits_in_period, ps_rbip->vq_rem_bits_in_period, |
| &ps_rbip->vq_rem_bits_in_period); |
| } |
| |
| if(i4_new_num_intra_frm_interval != ps_rbip->i4_num_intra_frm_interval) |
| { |
| WORD32 i4_rem_frms_in_period = ps_rbip->i4_tot_frms_in_gop |
| * (i4_new_num_intra_frm_interval |
| - ps_rbip->i4_num_intra_frm_interval); |
| |
| number_t vq_rem_frms_in_period, vq_new_bits_per_frm, |
| vq_delta_bits_in_period; |
| |
| /* new_bits_per_frm = new_new_bits_per_frm - old_new_bits_per_frm */ |
| SET_VAR_Q(vq_new_bits_per_frm, i4_new_bits_per_frm, 0); |
| |
| SET_VAR_Q(vq_rem_frms_in_period, i4_rem_frms_in_period, 0); |
| |
| /* delta_bits_in_period = new_bits_per_frm * rem_frms_in_period */ |
| mult32_var_q(vq_new_bits_per_frm, vq_rem_frms_in_period, |
| &vq_delta_bits_in_period); |
| |
| /* ps_rbip->rem_bits_in_period += delta_bits_in_period */ |
| add32_var_q(vq_delta_bits_in_period, ps_rbip->vq_rem_bits_in_period, |
| &ps_rbip->vq_rem_bits_in_period); |
| } |
| /* Update the new value */ |
| ps_rbip->i4_num_intra_frm_interval = i4_new_num_intra_frm_interval; |
| ps_rbip->i4_bits_per_frm = i4_new_bits_per_frm; |
| } |
| |
| WORD32 irc_ba_num_fill_use_free_memtab(bit_allocation_t **pps_bit_allocation, |
| itt_memtab_t *ps_memtab, |
| ITT_FUNC_TYPE_E e_func_type) |
| { |
| WORD32 i4_mem_tab_idx = 0; |
| bit_allocation_t s_bit_allocation_temp; |
| |
| /* |
| * Hack for all alloc, during which we don't have any state memory. |
| * Dereferencing can cause issues |
| */ |
| if(e_func_type == GET_NUM_MEMTAB || e_func_type == FILL_MEMTAB) |
| (*pps_bit_allocation) = &s_bit_allocation_temp; |
| |
| /*for src rate control state structure*/ |
| if(e_func_type != GET_NUM_MEMTAB) |
| { |
| fill_memtab(&ps_memtab[i4_mem_tab_idx], sizeof(bit_allocation_t), |
| ALIGN_128_BYTE, PERSISTENT, DDR); |
| use_or_fill_base(&ps_memtab[0], (void**)pps_bit_allocation, |
| e_func_type); |
| } |
| i4_mem_tab_idx++; |
| |
| i4_mem_tab_idx += irc_error_bits_num_fill_use_free_memtab( |
| &pps_bit_allocation[0]->ps_error_bits, |
| &ps_memtab[i4_mem_tab_idx], e_func_type); |
| |
| return (i4_mem_tab_idx); |
| } |
| |
| /******************************************************************************* |
| Function Name : irc_ba_init_bit_allocation |
| Description : Initialize the bit_allocation structure. |
| ******************************************************************************/ |
| void irc_ba_init_bit_allocation(bit_allocation_t *ps_bit_allocation, |
| pic_handling_handle ps_pic_handling, |
| WORD32 i4_num_intra_frm_interval, |
| WORD32 i4_bit_rate, |
| WORD32 i4_frm_rate, |
| WORD32 *i4_peak_bit_rate, |
| WORD32 i4_min_bitrate) |
| { |
| WORD32 i; |
| WORD32 i4_bits_per_frm, i4_max_bits_per_frm[MAX_NUM_DRAIN_RATES]; |
| |
| /* Calculate the bits per frame */ |
| X_PROD_Y_DIV_Z(i4_bit_rate, 1000, i4_frm_rate, i4_bits_per_frm); |
| for(i = 0; i < MAX_NUM_DRAIN_RATES; i++) |
| { |
| X_PROD_Y_DIV_Z(i4_peak_bit_rate[i], 1000, i4_frm_rate, |
| i4_max_bits_per_frm[i]); |
| } |
| /* Initialize the bits_per_frame */ |
| ps_bit_allocation->i4_bits_per_frm = i4_bits_per_frm; |
| for(i = 0; i < MAX_NUM_DRAIN_RATES; i++) |
| { |
| ps_bit_allocation->i4_max_bits_per_frm[i] = i4_max_bits_per_frm[i]; |
| } |
| X_PROD_Y_DIV_Z(i4_min_bitrate, 1000, i4_frm_rate, |
| ps_bit_allocation->i4_min_bits_per_frm); |
| |
| /* |
| * Initialize the rem_bits in period |
| * The first gop in case of an OPEN GOP may have fewer B_PICs, |
| * That condition is not taken care of |
| */ |
| init_rbip(&ps_bit_allocation->s_rbip, ps_pic_handling, i4_bits_per_frm, |
| i4_num_intra_frm_interval); |
| |
| /* Initialize the num_gops_in_period */ |
| ps_bit_allocation->i4_num_gops_in_period = i4_num_intra_frm_interval; |
| ps_bit_allocation->i4_actual_num_gops_in_period = i4_num_intra_frm_interval; |
| |
| /* Relative complexity between I and P frames */ |
| ps_bit_allocation->i2_K[I_PIC] = (1 << K_Q); |
| ps_bit_allocation->i2_K[P_PIC] = I_TO_P_RATIO; |
| ps_bit_allocation->i2_K[B_PIC] = (P_TO_B_RATIO * I_TO_P_RATIO) >> K_Q; |
| |
| /* Initialize the saved bits to 0*/ |
| SET_VAR_Q(ps_bit_allocation->vq_saved_bits, 0, 0); |
| |
| /* Update the error bits module with average bits */ |
| irc_init_error_bits(ps_bit_allocation->ps_error_bits, i4_frm_rate, |
| i4_bit_rate); |
| /* Store the input for implementing change in values */ |
| ps_bit_allocation->i4_frame_rate = i4_frm_rate; |
| ps_bit_allocation->i4_bit_rate = i4_bit_rate; |
| |
| memset(ps_bit_allocation->i4_prev_frm_header_bits, 0, sizeof(ps_bit_allocation->i4_prev_frm_header_bits)); |
| for(i=0;i<MAX_NUM_DRAIN_RATES;i++) |
| ps_bit_allocation->ai4_peak_bit_rate[i] = i4_peak_bit_rate[i]; |
| } |
| |
| /******************************************************************************* |
| Function Name : get_cur_frm_est_bits |
| Description : Based on remaining bits in period and rd_model |
| the number of bits required for the current frame is estimated. |
| ******************************************************************************/ |
| WORD32 irc_ba_get_cur_frm_est_texture_bits(bit_allocation_t *ps_bit_allocation, |
| rc_rd_model_handle *pps_rd_model, |
| est_sad_handle ps_est_sad, |
| pic_handling_handle ps_pic_handling, |
| picture_type_e e_pic_type) |
| { |
| WORD32 i, j; |
| WORD32 i4_est_texture_bits_for_frm; |
| number_t vq_rem_texture_bits; |
| number_t vq_complexity_estimate[MAX_PIC_TYPE]; |
| WORD32 i4_rem_frms_in_period[MAX_PIC_TYPE], i4_frms_in_period[MAX_PIC_TYPE]; |
| number_t vq_max_consumable_bits; |
| number_t vq_rem_frms_in_period[MAX_PIC_TYPE], vq_est_texture_bits_for_frm; |
| number_t vq_prev_hdr_bits[MAX_PIC_TYPE]; |
| |
| WORD32 complexity_est = 0; |
| |
| /* Get the rem_frms_in_gop & the frms_in_gop from the pic_type state struct */ |
| irc_pic_type_get_rem_frms_in_gop(ps_pic_handling, i4_rem_frms_in_period); |
| irc_pic_type_get_frms_in_gop(ps_pic_handling, i4_frms_in_period); |
| |
| /* Depending on the number of gops in a period, find the num_frms_in_prd */ |
| for(j = 0; j < MAX_PIC_TYPE; j++) |
| { |
| i4_rem_frms_in_period[j] += (i4_frms_in_period[j] |
| * (ps_bit_allocation->i4_num_gops_in_period - 1)); |
| i4_frms_in_period[j] *= ps_bit_allocation->i4_num_gops_in_period; |
| } |
| |
| /* Remove the header bits from the remaining bits to find how many bits you |
| can transfer.*/ |
| irc_ba_update_rbip(&ps_bit_allocation->s_rbip, ps_pic_handling, 0); |
| for(i = 0; i < MAX_PIC_TYPE; i++) |
| { |
| SET_VAR_Q(vq_rem_frms_in_period[i], i4_rem_frms_in_period[i], 0); |
| SET_VAR_Q(vq_prev_hdr_bits[i], |
| ps_bit_allocation->i4_prev_frm_header_bits[i], 0); |
| } |
| { |
| /* |
| *rem_texture_bits = rem_bits_in_period - |
| *(rem_frms_in_period[I_PIC] * prev_frm_header_bits[I_PIC]) - |
| *(rem_frms_in_period[P_PIC] * prev_frm_header_bits[P_PIC]) - |
| *(rem_frms_in_period[B_PIC] * prev_frm_header_bits[B_PIC]); |
| */ |
| number_t vq_rem_hdr_bits; |
| vq_rem_texture_bits = ps_bit_allocation->s_rbip.vq_rem_bits_in_period; |
| |
| mult32_var_q(vq_prev_hdr_bits[I_PIC], vq_rem_frms_in_period[I_PIC], |
| &vq_rem_hdr_bits); |
| sub32_var_q(vq_rem_texture_bits, vq_rem_hdr_bits, &vq_rem_texture_bits); |
| |
| mult32_var_q(vq_prev_hdr_bits[P_PIC], vq_rem_frms_in_period[P_PIC], |
| &vq_rem_hdr_bits); |
| sub32_var_q(vq_rem_texture_bits, vq_rem_hdr_bits, &vq_rem_texture_bits); |
| |
| mult32_var_q(vq_prev_hdr_bits[B_PIC], vq_rem_frms_in_period[B_PIC], |
| &vq_rem_hdr_bits); |
| sub32_var_q(vq_rem_texture_bits, vq_rem_hdr_bits, &vq_rem_texture_bits); |
| } |
| { |
| /* max_consumable_bits = |
| *(frms_in_period[I_PIC] * max_bits_per_frm[0] ) + |
| *(frms_in_period[P_PIC] + frms_in_period[B_PIC] ) * max_bits_per_frm[1]; |
| */ |
| number_t vq_max_bits, vq_max_bits_per_frm[2]; |
| |
| SET_VAR_Q(vq_max_bits_per_frm[0], |
| ps_bit_allocation->i4_max_bits_per_frm[0], 0); |
| SET_VAR_Q(vq_max_bits_per_frm[1], |
| ps_bit_allocation->i4_max_bits_per_frm[1], 0); |
| |
| mult32_var_q(vq_rem_frms_in_period[I_PIC], vq_max_bits_per_frm[0], |
| &vq_max_bits); |
| vq_max_consumable_bits = vq_max_bits; |
| |
| mult32_var_q(vq_rem_frms_in_period[P_PIC], vq_max_bits_per_frm[1], |
| &vq_max_bits); |
| add32_var_q(vq_max_bits, vq_max_consumable_bits, |
| &vq_max_consumable_bits); |
| |
| mult32_var_q(vq_rem_frms_in_period[B_PIC], vq_max_bits_per_frm[1], |
| &vq_max_bits); |
| add32_var_q(vq_max_bits, vq_max_consumable_bits, |
| &vq_max_consumable_bits); |
| } |
| |
| /* rem_texture_bits = MIN(rem_texture_bits, max_consumable_bits) */ |
| MIN_VARQ(vq_max_consumable_bits, vq_rem_texture_bits, vq_rem_texture_bits); |
| |
| /* The bits are then allocated based on the relative complexity of the |
| current frame with respect to that of the rest of the frames in period */ |
| for(i = 0; i < MAX_PIC_TYPE; i++) |
| { |
| number_t vq_lin_mod_coeff, vq_est_sad, vq_K; |
| |
| /* Getting the linear model coefficient */ |
| vq_lin_mod_coeff = irc_get_linear_coefficient(pps_rd_model[i]); |
| |
| /* Getting the estimated SAD */ |
| SET_VAR_Q(vq_est_sad, irc_get_est_sad(ps_est_sad,i), 0); |
| |
| /* Making K factor a var Q format */ |
| SET_VAR_Q(vq_K, ps_bit_allocation->i2_K[i], K_Q); |
| |
| /* Complexity_estimate = [ (lin_mod_coeff * estimated_sad) / K factor ] */ |
| mult32_var_q(vq_lin_mod_coeff, vq_est_sad, &vq_lin_mod_coeff); |
| div32_var_q(vq_lin_mod_coeff, vq_K, &vq_complexity_estimate[i]); |
| } |
| |
| /* |
| * For simple cases, one of the complexities go to zero and in those cases |
| * distribute the bits evenly among frames based on I_TO_P_RATIO |
| */ |
| |
| /* Also check the B-pictures complexity only in case they are present*/ |
| if(i4_frms_in_period[B_PIC] == 0) |
| { |
| complexity_est = (vq_complexity_estimate[I_PIC] |
| && vq_complexity_estimate[P_PIC]); |
| } |
| else |
| { |
| complexity_est = (vq_complexity_estimate[I_PIC] |
| && vq_complexity_estimate[P_PIC] |
| && vq_complexity_estimate[B_PIC]); |
| } |
| |
| if(complexity_est) |
| { |
| /* |
| * Estimated texture bits = |
| * (remaining bits) * (cur frm complexity) |
| * --------------------------------------- |
| * (num_i_frm*i_frm_complexity) + (num_p_frm*pfrm_complexity) |
| * + (b_frm * b_frm_cm) |
| */ |
| mult32_var_q(vq_rem_texture_bits, vq_complexity_estimate[e_pic_type], |
| &vq_rem_texture_bits); |
| |
| for(i = 0; i < MAX_PIC_TYPE; i++) |
| { |
| mult32_var_q(vq_rem_frms_in_period[i], vq_complexity_estimate[i], |
| &vq_rem_frms_in_period[i]); |
| } |
| |
| add32_var_q(vq_rem_frms_in_period[I_PIC], vq_rem_frms_in_period[P_PIC], |
| &vq_rem_frms_in_period[I_PIC]); |
| |
| add32_var_q(vq_rem_frms_in_period[I_PIC], vq_rem_frms_in_period[B_PIC], |
| &vq_rem_frms_in_period[I_PIC]); |
| |
| div32_var_q(vq_rem_texture_bits, vq_rem_frms_in_period[I_PIC], |
| &vq_est_texture_bits_for_frm); |
| |
| number_t_to_word32(vq_est_texture_bits_for_frm, |
| &i4_est_texture_bits_for_frm); |
| } |
| else |
| { |
| number_t vq_i_to_p_bit_ratio, vq_rem_frms; |
| |
| SET_VAR_Q(vq_i_to_p_bit_ratio, I_TO_P_BIT_RATIO, 0); |
| |
| /* rem_frms = ((I_TO_P_BIT_RATIO * rem_frms_in_period[I_PIC]) + |
| * rem_frms_in_period[P_PIC] + rem_frms_in_period[B_PIC]); |
| */ |
| mult32_var_q(vq_rem_frms_in_period[I_PIC], vq_i_to_p_bit_ratio, |
| &vq_rem_frms); |
| add32_var_q(vq_rem_frms_in_period[P_PIC], vq_rem_frms, &vq_rem_frms); |
| add32_var_q(vq_rem_frms_in_period[B_PIC], vq_rem_frms, &vq_rem_frms); |
| |
| /* est_texture_bits_for_frm = rem_texture_bits / rem_frms */ |
| div32_var_q(vq_rem_texture_bits, vq_rem_frms, |
| &vq_est_texture_bits_for_frm); |
| number_t_to_word32(vq_est_texture_bits_for_frm, |
| &i4_est_texture_bits_for_frm); |
| |
| i4_est_texture_bits_for_frm = |
| (I_PIC == e_pic_type) ? |
| (i4_est_texture_bits_for_frm |
| * I_TO_P_BIT_RATIO) : |
| i4_est_texture_bits_for_frm; |
| } |
| |
| /* |
| * If the remaining bits in the period becomes negative then the estimated |
| * texture bits would also become negative. This would send a feedback to |
| * the model which may go for a toss. Thus sending the minimum possible |
| * value = 0 |
| */ |
| if(i4_est_texture_bits_for_frm < 0) |
| { |
| i4_est_texture_bits_for_frm = 0; |
| } |
| |
| return (i4_est_texture_bits_for_frm); |
| } |
| |
| /****************************************************************************** |
| Function Name : irc_ba_get_cur_frm_est_header_bits |
| Description : Based on remaining bits in period and rd_model |
| the number of bits required for the current frame is estimated. |
| ******************************************************************************/ |
| WORD32 irc_ba_get_cur_frm_est_header_bits(bit_allocation_t *ps_bit_allocation, |
| picture_type_e e_pic_type) |
| { |
| return (ps_bit_allocation->i4_prev_frm_header_bits[e_pic_type]); |
| } |
| |
| WORD32 irc_ba_get_rem_bits_in_period(bit_allocation_t *ps_bit_allocation, |
| pic_handling_handle ps_pic_handling) |
| { |
| WORD32 i4_rem_bits_in_gop = 0; |
| irc_ba_update_rbip(&ps_bit_allocation->s_rbip, ps_pic_handling, 0); |
| number_t_to_word32(ps_bit_allocation->s_rbip.vq_rem_bits_in_period, |
| &i4_rem_bits_in_gop); |
| return (i4_rem_bits_in_gop); |
| } |
| |
| /******************************************************************************* |
| Function Name : irc_ba_update_cur_frm_consumed_bits |
| Description : Based on remaining bits in period and rd_model |
| the number of bits required for the current frame is estimated. |
| ******************************************************************************/ |
| void irc_ba_update_cur_frm_consumed_bits(bit_allocation_t *ps_bit_allocation, |
| pic_handling_handle ps_pic_handling, |
| WORD32 i4_total_frame_bits, |
| WORD32 i4_model_updation_hdr_bits, |
| picture_type_e e_pic_type, |
| UWORD8 u1_is_scd, |
| WORD32 i4_last_frm_in_gop) |
| { |
| WORD32 i4_error_bits = irc_get_error_bits(ps_bit_allocation->ps_error_bits); |
| |
| /* Update the remaining bits in period */ |
| irc_ba_update_rbip(&ps_bit_allocation->s_rbip, ps_pic_handling, |
| (-i4_total_frame_bits + i4_error_bits)); |
| |
| /* |
| * Update the header bits so that it can be used as an estimate to the next |
| * frame |
| */ |
| if(u1_is_scd) |
| { |
| /* |
| * In case of SCD, even though the frame type is P, it is equivalent to |
| * a I frame and so the corresponding header bits is updated |
| */ |
| ps_bit_allocation->i4_prev_frm_header_bits[I_PIC] = |
| i4_model_updation_hdr_bits; |
| |
| #define MAX_NUM_GOPS_IN_PERIOD (3) |
| if(ps_bit_allocation->i4_num_gops_in_period < MAX_NUM_GOPS_IN_PERIOD) |
| { |
| /* |
| * Whenever there is a scene change increase the number of gops by |
| * 2 so that the number of bits allocated is not very constrained |
| */ |
| ps_bit_allocation->i4_num_gops_in_period += 2; |
| /* Add the extra bits in GOP to remaining bits in period */ |
| irc_ba_change_rbip(&ps_bit_allocation->s_rbip, ps_pic_handling, |
| ps_bit_allocation->i4_bits_per_frm, |
| ps_bit_allocation->i4_num_gops_in_period); |
| } |
| } |
| else |
| { |
| ps_bit_allocation->i4_prev_frm_header_bits[e_pic_type] = |
| i4_model_updation_hdr_bits; |
| } |
| |
| if(i4_last_frm_in_gop) |
| { |
| WORD32 i4_num_bits_in_a_gop = get_number_of_frms_in_a_gop( |
| ps_pic_handling) * ps_bit_allocation->i4_bits_per_frm; |
| /* |
| * If the number of gops in period has been increased due to scene |
| * change, slowly bring in down across the gops |
| */ |
| if(ps_bit_allocation->i4_num_gops_in_period |
| > ps_bit_allocation->i4_actual_num_gops_in_period) |
| { |
| ps_bit_allocation->i4_num_gops_in_period--; |
| irc_ba_change_rbip(&ps_bit_allocation->s_rbip, ps_pic_handling, |
| ps_bit_allocation->i4_bits_per_frm, |
| ps_bit_allocation->i4_num_gops_in_period); |
| } |
| /* |
| * If rem_bits_in_period < 0 decrease the number of bits allocated for |
| * the next period else increase it |
| */ |
| irc_ba_update_rbip(&ps_bit_allocation->s_rbip, ps_pic_handling, |
| i4_num_bits_in_a_gop); |
| } |
| /* Update the lower modules */ |
| irc_update_error_bits(ps_bit_allocation->ps_error_bits); |
| } |
| |
| void irc_ba_change_remaining_bits_in_period(bit_allocation_t *ps_bit_allocation, |
| pic_handling_handle ps_pic_handling, |
| WORD32 i4_bit_rate, |
| WORD32 i4_frame_rate, |
| WORD32 *i4_peak_bit_rate) |
| { |
| WORD32 i4_new_avg_bits_per_frm; |
| WORD32 i4_new_peak_bits_per_frm[MAX_NUM_DRAIN_RATES]; |
| WORD32 i4_rem_frms_in_period[MAX_PIC_TYPE]; |
| int i; |
| |
| /* Calculate the new per frame bits */ |
| X_PROD_Y_DIV_Z(i4_bit_rate, 1000, i4_frame_rate, i4_new_avg_bits_per_frm); |
| for(i = 0; i < MAX_NUM_DRAIN_RATES; i++) |
| { |
| X_PROD_Y_DIV_Z(i4_peak_bit_rate[i], 1000, i4_frame_rate, |
| i4_new_peak_bits_per_frm[i]); |
| } |
| |
| for(i = 0; i < MAX_NUM_DRAIN_RATES; i++) |
| { |
| ps_bit_allocation->i4_max_bits_per_frm[i] = i4_new_peak_bits_per_frm[i]; |
| } |
| |
| /* |
| * Get the rem_frms_in_prd & the frms_in_prd from the pic_type state |
| * struct |
| */ |
| irc_pic_type_get_rem_frms_in_gop(ps_pic_handling, i4_rem_frms_in_period); |
| |
| /* |
| * If the difference > 0(/ <0), the remaining bits in period needs to be |
| * increased(/decreased) based on the remaining number of frames |
| */ |
| irc_ba_change_rbip(&ps_bit_allocation->s_rbip, ps_pic_handling, |
| i4_new_avg_bits_per_frm, |
| ps_bit_allocation->i4_num_gops_in_period); |
| |
| /* Update the new average bits per frame */ |
| ps_bit_allocation->i4_bits_per_frm = i4_new_avg_bits_per_frm; |
| /* change the lower modules state */ |
| irc_change_bitrate_in_error_bits(ps_bit_allocation->ps_error_bits, |
| i4_bit_rate); |
| irc_change_frm_rate_in_error_bits(ps_bit_allocation->ps_error_bits, |
| i4_frame_rate); |
| |
| /* Store the modified frame_rate */ |
| ps_bit_allocation->i4_frame_rate = i4_frame_rate; |
| ps_bit_allocation->i4_bit_rate = i4_bit_rate; |
| for(i = 0; i < MAX_NUM_DRAIN_RATES; i++) |
| ps_bit_allocation->ai4_peak_bit_rate[i] = i4_peak_bit_rate[i]; |
| } |
| |
| void irc_ba_change_ba_peak_bit_rate(bit_allocation_t *ps_bit_allocation, |
| WORD32 *ai4_peak_bit_rate) |
| { |
| WORD32 i; |
| |
| /* Calculate the bits per frame */ |
| for(i = 0; i < MAX_NUM_DRAIN_RATES; i++) |
| { |
| X_PROD_Y_DIV_Z(ai4_peak_bit_rate[i], 1000, |
| ps_bit_allocation->i4_frame_rate, |
| ps_bit_allocation->i4_max_bits_per_frm[i]); |
| ps_bit_allocation->ai4_peak_bit_rate[i] = ai4_peak_bit_rate[i]; |
| } |
| } |
| |
| /****************************************************************************** |
| * @brief Modifies the remaining bit in period for the gop which has fif. |
| * since fif would cause a new gop to be created, we need to add the number |
| * of encoded frames in the fif GOP worth of bits to remaining bits in |
| * period |
| ******************************************************************************/ |
| void irc_ba_change_rem_bits_in_prd_at_force_I_frame(bit_allocation_t *ps_bit_allocation, |
| pic_handling_handle ps_pic_handling) |
| { |
| WORD32 i4_frms_in_period; |
| i4_frms_in_period = irc_pic_type_get_frms_in_gop_force_I_frm( |
| ps_pic_handling); |
| irc_ba_update_rbip(&ps_bit_allocation->s_rbip, ps_pic_handling, |
| ps_bit_allocation->i4_bits_per_frm * i4_frms_in_period); |
| } |
| |
| void irc_ba_check_and_update_bit_allocation(bit_allocation_t *ps_bit_allocation, |
| pic_handling_handle ps_pic_handling, |
| WORD32 i4_cur_buf_size, |
| WORD32 i4_max_buf_size, |
| WORD32 i4_max_bits_inflow_per_frm, |
| WORD32 i4_tot_frame_bits) |
| { |
| |
| number_t vq_max_drain_bits, vq_extra_bits, vq_less_bits, |
| vq_allocated_saved_bits, vq_min_bits_for_period; |
| WORD32 i4_num_frms_in_period = get_number_of_frms_in_a_gop(ps_pic_handling); |
| number_t vq_rem_bits_in_period, vq_num_frms_in_period, vq_zero; |
| WORD32 b_rem_bits_gt_max_drain, b_rem_bits_lt_min_bits, |
| b_saved_bits_gt_zero; |
| rem_bit_in_prd_t *ps_rbip = &ps_bit_allocation->s_rbip; |
| |
| UNUSED(i4_cur_buf_size); |
| UNUSED(i4_max_buf_size); |
| UNUSED(i4_tot_frame_bits); |
| |
| /* |
| * If the remaining bits is greater than what can be drained in that period |
| * Clip the remaining bits in period to the maximum it can drain in that |
| * period with the error of current buffer size.Accumulate the saved bits |
| * if any. else if the remaining bits is lesser than the minimum bit rate |
| * promised in that period Add the excess bits to remaining bits in period |
| * and reduce it from the saved bits Else Provide the extra bits from the |
| * "saved bits pool". |
| */ |
| /* |
| * max_drain_bits = num_gops_in_period * num_frms_in_period * |
| * * max_bits_inflow_per_frm |
| */ |
| SET_VAR_Q(vq_num_frms_in_period, |
| (ps_bit_allocation->i4_num_gops_in_period * i4_num_frms_in_period), |
| 0); |
| SET_VAR_Q(vq_max_drain_bits, i4_max_bits_inflow_per_frm, 0); |
| SET_VAR_Q(vq_zero, 0, 0); |
| mult32_var_q(vq_max_drain_bits, vq_num_frms_in_period, &vq_max_drain_bits); |
| |
| /* |
| * min_bits_for_period = num_gops_in_period * num_frms_in_period * |
| * min_bits_per_frm |
| */ |
| SET_VAR_Q(vq_min_bits_for_period, ps_bit_allocation->i4_min_bits_per_frm, |
| 0); |
| mult32_var_q(vq_min_bits_for_period, vq_num_frms_in_period, |
| &vq_min_bits_for_period); |
| |
| vq_rem_bits_in_period = ps_rbip->vq_rem_bits_in_period; |
| |
| /* Evaluate rem_bits_in_period > max_drain_bits */ |
| VQ_A_GT_VQ_B(ps_rbip->vq_rem_bits_in_period, vq_max_drain_bits, |
| b_rem_bits_gt_max_drain); |
| |
| /* Evaluate rem_bits_in_period < min_bits_for_period */ |
| VQ_A_LT_VQ_B(ps_rbip->vq_rem_bits_in_period, vq_min_bits_for_period, |
| b_rem_bits_lt_min_bits); |
| |
| /* Evaluate saved_bits > 0 */ |
| VQ_A_LT_VQ_B(ps_bit_allocation->vq_saved_bits, vq_zero, |
| b_saved_bits_gt_zero); |
| |
| /* (i4_rem_bits_in_period > i4_max_drain_bits) */ |
| if(b_rem_bits_gt_max_drain) |
| { |
| /* extra_bits = rem_bits_in_period - max_drain_bits */ |
| sub32_var_q(ps_rbip->vq_rem_bits_in_period, vq_max_drain_bits, |
| &vq_extra_bits); |
| |
| /* saved_bits += extra_bits */ |
| add32_var_q(ps_bit_allocation->vq_saved_bits, vq_extra_bits, |
| &ps_bit_allocation->vq_saved_bits); |
| |
| /* rem_bits_in_period = vq_max_drain_bits */ |
| ps_rbip->vq_rem_bits_in_period = vq_max_drain_bits; |
| } |
| else if(b_rem_bits_lt_min_bits) |
| { |
| /* extra_bits(-ve) = rem_bits_in_period - i4_min_bits_for_period */ |
| sub32_var_q(ps_rbip->vq_rem_bits_in_period, vq_min_bits_for_period, |
| &vq_extra_bits); |
| |
| /* saved_bits += extra_bits(-ve) */ |
| add32_var_q(ps_bit_allocation->vq_saved_bits, vq_extra_bits, |
| &ps_bit_allocation->vq_saved_bits); |
| |
| /* rem_bits_in_period = min_bits_for_period */ |
| ps_rbip->vq_rem_bits_in_period = vq_min_bits_for_period; |
| } |
| else if(b_saved_bits_gt_zero) |
| { |
| /* less_bits = max_drain_bits - _rem_bits_in_period */ |
| sub32_var_q(vq_max_drain_bits, vq_rem_bits_in_period, &vq_less_bits); |
| |
| /* allocated_saved_bits = MIN (less_bits, saved_bits) */ |
| MIN_VARQ(ps_bit_allocation->vq_saved_bits, vq_less_bits, |
| vq_allocated_saved_bits); |
| |
| /* rem_bits_in_period += allocted_save_bits */ |
| add32_var_q(ps_rbip->vq_rem_bits_in_period, vq_allocated_saved_bits, |
| &ps_rbip->vq_rem_bits_in_period); |
| |
| /* saved_bits -= allocted_save_bits */ |
| sub32_var_q(ps_bit_allocation->vq_saved_bits, vq_allocated_saved_bits, |
| &ps_bit_allocation->vq_saved_bits); |
| } |
| return; |
| } |
| |
| WORD32 irc_ba_get_frame_rate(bit_allocation_t *ps_bit_allocation) |
| { |
| return (ps_bit_allocation->i4_frame_rate); |
| } |
| |
| WORD32 irc_ba_get_bit_rate(bit_allocation_t *ps_bit_allocation) |
| { |
| return (ps_bit_allocation->i4_bit_rate); |
| } |
| |
| void irc_ba_get_peak_bit_rate(bit_allocation_t *ps_bit_allocation, |
| WORD32 *pi4_peak_bit_rate) |
| { |
| WORD32 i; |
| for(i = 0; i < MAX_NUM_DRAIN_RATES; i++) |
| { |
| pi4_peak_bit_rate[i] = ps_bit_allocation->ai4_peak_bit_rate[i]; |
| } |
| } |
