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369 lines
12 KiB
369 lines
12 KiB
/******************************************************************************
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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_common.h"
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#include "irc_cntrl_param.h"
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#include "irc_mem_req_and_acq.h"
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#include "irc_fixed_point_error_bits.h"
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#include "irc_vbr_storage_vbv.h"
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#include "irc_trace_support.h"
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#define MAX(x, y) ((x) > (y) ? (x) : (y))
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typedef struct vbr_storage_vbv_t
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{
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WORD32 i4_max_buf_size;
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WORD32 i4_cur_buf_size;
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WORD32 i4_max_bits_inflow_per_frm_period;
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WORD32 i4_max_bits_per_tgt_frm;
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/* Storing input variables */
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WORD32 i4_max_bit_rate;
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WORD32 i4_max_frame_rate;
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/* Error bits calculation module */
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error_bits_handle ps_error_bits;
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} vbr_storage_vbv_t;
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static void overflow_avoided_summation(WORD32 *pi4_accumulator, WORD32 i4_input)
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{
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if((pi4_accumulator[0] > 0)
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&& (((int)0x7fffffff - pi4_accumulator[0]) < i4_input))
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{
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pi4_accumulator[0] = 0x7fffffff;
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}
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else if((pi4_accumulator[0] < 0)
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&& (((int)0x80000000 - pi4_accumulator[0]) > i4_input))
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{
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pi4_accumulator[0] = 0x80000000;
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}
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else
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{
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pi4_accumulator[0] += i4_input;
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}
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}
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WORD32 irc_vbr_vbv_num_fill_use_free_memtab(vbr_storage_vbv_t **pps_vbr_storage_vbv,
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itt_memtab_t *ps_memtab,
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ITT_FUNC_TYPE_E e_func_type)
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{
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WORD32 i4_mem_tab_idx = 0;
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vbr_storage_vbv_t s_vbr_storage_vbv_temp;
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/*
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* Hack for al alloc, during which we don't have any state memory.
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* Dereferencing can cause issues
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*/
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if(e_func_type == GET_NUM_MEMTAB || e_func_type == FILL_MEMTAB)
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(*pps_vbr_storage_vbv) = &s_vbr_storage_vbv_temp;
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/*for src rate control state structure*/
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if(e_func_type != GET_NUM_MEMTAB)
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{
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fill_memtab(&ps_memtab[i4_mem_tab_idx], sizeof(vbr_storage_vbv_t),
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ALIGN_128_BYTE, PERSISTENT, DDR);
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use_or_fill_base(&ps_memtab[0], (void**)pps_vbr_storage_vbv,
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e_func_type);
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}
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i4_mem_tab_idx++;
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i4_mem_tab_idx += irc_error_bits_num_fill_use_free_memtab(
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&pps_vbr_storage_vbv[0]->ps_error_bits,
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&ps_memtab[i4_mem_tab_idx], e_func_type);
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return (i4_mem_tab_idx);
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}
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void irc_init_vbr_vbv(vbr_storage_vbv_t *ps_vbr_storage_vbv,
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WORD32 i4_max_bit_rate,
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WORD32 i4_frm_rate,
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WORD32 i4_max_vbv_buff_size)
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{
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ps_vbr_storage_vbv->i4_max_buf_size = i4_max_vbv_buff_size;
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ps_vbr_storage_vbv->i4_cur_buf_size = i4_max_vbv_buff_size;
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/*
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* Calculate the max number of bits that flow into the decoder
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* in the interval of two frames
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*/
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X_PROD_Y_DIV_Z(i4_max_bit_rate, 1000, i4_frm_rate,
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ps_vbr_storage_vbv->i4_max_bits_inflow_per_frm_period);
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/* init error bits */
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irc_init_error_bits(ps_vbr_storage_vbv->ps_error_bits, i4_frm_rate,
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i4_max_bit_rate);
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/* Storing the input values */
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ps_vbr_storage_vbv->i4_max_bits_per_tgt_frm =
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ps_vbr_storage_vbv->i4_max_bits_inflow_per_frm_period;
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ps_vbr_storage_vbv->i4_max_bit_rate = i4_max_bit_rate;
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ps_vbr_storage_vbv->i4_max_frame_rate = i4_frm_rate;
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}
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void irc_update_vbr_vbv(vbr_storage_vbv_t *ps_vbr_storage_vbv,
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WORD32 i4_total_bits_decoded)
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{
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WORD32 i4_error_bits = irc_get_error_bits(
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ps_vbr_storage_vbv->ps_error_bits);
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/*
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* In the time interval between two decoded frames the buffer would have been
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* filled up by the max_bits_inflow_per_frm_period.
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*/
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overflow_avoided_summation(
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&ps_vbr_storage_vbv->i4_cur_buf_size,
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(ps_vbr_storage_vbv->i4_max_bits_inflow_per_frm_period
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+ i4_error_bits));
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if(ps_vbr_storage_vbv->i4_cur_buf_size
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> ps_vbr_storage_vbv->i4_max_buf_size)
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{
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ps_vbr_storage_vbv->i4_cur_buf_size =
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ps_vbr_storage_vbv->i4_max_buf_size;
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}
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ps_vbr_storage_vbv->i4_cur_buf_size -= i4_total_bits_decoded;
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/* Update the error bits state */
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irc_update_error_bits(ps_vbr_storage_vbv->ps_error_bits);
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}
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WORD32 irc_get_max_target_bits(vbr_storage_vbv_t *ps_vbr_storage_vbv)
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{
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WORD32 i4_cur_buf_size = ps_vbr_storage_vbv->i4_cur_buf_size;
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WORD32 i4_error_bits = irc_get_error_bits(
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ps_vbr_storage_vbv->ps_error_bits);
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/* The buffer size when the next frame is decoded */
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overflow_avoided_summation(
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&i4_cur_buf_size,
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(ps_vbr_storage_vbv->i4_max_bits_inflow_per_frm_period
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+ i4_error_bits));
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if(i4_cur_buf_size > ps_vbr_storage_vbv->i4_max_buf_size)
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{
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i4_cur_buf_size = ps_vbr_storage_vbv->i4_max_buf_size;
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}
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/*
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* Thus for the next frame the maximum number of bits the decoder can consume
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* without underflow is i4_cur_buf_size
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*/
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return i4_cur_buf_size;
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}
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/****************************************************************************
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Function Name : irc_get_buffer_status
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Description : Gets the state of VBV buffer
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Inputs : Rate control API , header and texture bits
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Outputs : 0 = normal, 1 = underflow, 2= overflow
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Returns : vbv_buf_status_e
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*****************************************************************************/
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vbv_buf_status_e irc_get_vbv_buffer_status(vbr_storage_vbv_t *ps_vbr_storage_vbv,
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WORD32 i4_total_frame_bits,
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WORD32 *pi4_num_bits_to_prevent_vbv_underflow)
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{
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vbv_buf_status_e e_buf_status;
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WORD32 i4_cur_buf;
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WORD32 i4_error_bits = irc_get_error_bits(
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ps_vbr_storage_vbv->ps_error_bits);
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/* error bits due to fixed point computation of drain rate*/
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i4_cur_buf = ps_vbr_storage_vbv->i4_cur_buf_size;
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overflow_avoided_summation(
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&i4_cur_buf,
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(ps_vbr_storage_vbv->i4_max_bits_inflow_per_frm_period
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+ i4_error_bits));
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if(i4_cur_buf > ps_vbr_storage_vbv->i4_max_buf_size)
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{
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i4_cur_buf = ps_vbr_storage_vbv->i4_max_buf_size;
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}
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pi4_num_bits_to_prevent_vbv_underflow[0] = i4_cur_buf;
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i4_cur_buf -= i4_total_frame_bits;
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if(i4_cur_buf < 0)
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{
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e_buf_status = VBV_UNDERFLOW;
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}
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else if(i4_cur_buf > ps_vbr_storage_vbv->i4_max_buf_size)
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{
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e_buf_status = VBV_OVERFLOW;
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}
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else if(i4_cur_buf < (ps_vbr_storage_vbv->i4_max_buf_size >> 2))
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{
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e_buf_status = VBR_CAUTION;
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}
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else
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{
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e_buf_status = VBV_NORMAL;
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}
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return e_buf_status;
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}
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UWORD8 irc_restrict_swing_dvd_comp(vbr_storage_vbv_t *ps_vbr_storage_vbv)
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{
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UWORD8 u1_restrict_swing = 1;
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if(ps_vbr_storage_vbv->i4_cur_buf_size
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< (ps_vbr_storage_vbv->i4_max_buf_size >> 1))
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{
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u1_restrict_swing = 0;
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}
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return (u1_restrict_swing);
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}
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WORD32 irc_get_max_vbv_buf_size(vbr_storage_vbv_t *ps_vbr_storage_vbv)
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{
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return (ps_vbr_storage_vbv->i4_max_buf_size);
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}
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WORD32 irc_get_cur_vbv_buf_size(vbr_storage_vbv_t *ps_vbr_storage_vbv)
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{
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return (ps_vbr_storage_vbv->i4_cur_buf_size);
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}
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WORD32 irc_get_max_bits_inflow_per_frm_periode(vbr_storage_vbv_t *ps_vbr_storage_vbv)
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{
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return (ps_vbr_storage_vbv->i4_max_bits_inflow_per_frm_period);
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}
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WORD32 irc_get_max_bits_per_tgt_frm(vbr_storage_vbv_t *ps_vbr_storage_vbv)
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{
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return (ps_vbr_storage_vbv->i4_max_bits_per_tgt_frm);
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}
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WORD32 irc_vbv_get_vbv_buf_fullness(vbr_storage_vbv_t *ps_vbr_storage_vbv,
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UWORD32 u4_bits)
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{
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WORD32 i4_error_bits = irc_get_error_bits(
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ps_vbr_storage_vbv->ps_error_bits);
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WORD32 i4_cur_buf_size = ps_vbr_storage_vbv->i4_cur_buf_size;
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overflow_avoided_summation(
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&i4_cur_buf_size,
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(ps_vbr_storage_vbv->i4_max_bits_inflow_per_frm_period
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+ i4_error_bits));
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if(i4_cur_buf_size > ps_vbr_storage_vbv->i4_max_buf_size)
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{
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i4_cur_buf_size = ps_vbr_storage_vbv->i4_max_buf_size;
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}
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i4_cur_buf_size -= u4_bits;
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return (i4_cur_buf_size);
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}
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WORD32 irc_get_max_tgt_bits_dvd_comp(vbr_storage_vbv_t *ps_vbr_storage_vbv,
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WORD32 i4_rem_bits_in_gop,
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WORD32 i4_rem_frms_in_gop,
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picture_type_e e_pic_type)
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{
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WORD32 i4_dbf_max, i4_dbf_min, i4_dbf_prev, i4_vbv_size, i4_dbf_desired;
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WORD32 i4_max_tgt_bits;
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i4_vbv_size = ps_vbr_storage_vbv->i4_max_buf_size;
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i4_dbf_max = 95 * i4_vbv_size / 100;
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i4_dbf_min = 10 * i4_vbv_size / 100;
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i4_dbf_prev = ps_vbr_storage_vbv->i4_cur_buf_size;
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if(i4_rem_bits_in_gop < 0)
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i4_rem_bits_in_gop = 0;
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if(i4_rem_frms_in_gop <= 0)
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i4_rem_frms_in_gop = 1;
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if(e_pic_type == I_PIC)
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{
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i4_dbf_desired = i4_dbf_min;
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}
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else
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{
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i4_dbf_desired = (i4_dbf_max - i4_rem_bits_in_gop / i4_rem_frms_in_gop
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- i4_dbf_prev) / i4_rem_frms_in_gop;
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i4_dbf_desired += i4_dbf_prev;
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}
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i4_dbf_prev += ps_vbr_storage_vbv->i4_max_bits_inflow_per_frm_period;
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if(i4_dbf_prev > ps_vbr_storage_vbv->i4_max_buf_size)
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{
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i4_dbf_prev = ps_vbr_storage_vbv->i4_max_buf_size;
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}
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i4_max_tgt_bits = MAX(0, (i4_dbf_prev - i4_dbf_desired));
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return (i4_max_tgt_bits);
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}
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void irc_change_vbr_vbv_frame_rate(vbr_storage_vbv_t *ps_vbr_storage_vbv,
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WORD32 i4_frm_rate)
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{
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/*
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* Calculate the max number of bits that flow into the decoder
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* in the interval of two frames
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*/
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X_PROD_Y_DIV_Z(ps_vbr_storage_vbv->i4_max_bit_rate, 1000, i4_frm_rate,
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ps_vbr_storage_vbv->i4_max_bits_inflow_per_frm_period);
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/* Update the lower modules */
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irc_change_frm_rate_in_error_bits(ps_vbr_storage_vbv->ps_error_bits,
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i4_frm_rate);
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/* Storing the input values */
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ps_vbr_storage_vbv->i4_max_frame_rate = i4_frm_rate;
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}
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void irc_change_vbr_vbv_bit_rate(vbr_storage_vbv_t *ps_vbr_storage_vbv,
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WORD32 i4_max_bit_rate)
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{
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/*
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* Calculate the max number of bits that flow into the decoder
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* in the interval of two frames
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*/
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X_PROD_Y_DIV_Z(i4_max_bit_rate, 1000, ps_vbr_storage_vbv->i4_max_frame_rate,
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ps_vbr_storage_vbv->i4_max_bits_inflow_per_frm_period);
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/* update the lower modules */
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irc_change_bitrate_in_error_bits(ps_vbr_storage_vbv->ps_error_bits,
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i4_max_bit_rate);
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/* Storing the input values */
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ps_vbr_storage_vbv->i4_max_bit_rate = i4_max_bit_rate;
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}
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void irc_change_vbr_max_bits_per_tgt_frm(vbr_storage_vbv_t *ps_vbr_storage_vbv,
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WORD32 i4_tgt_frm_rate)
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{
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/*
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* Calculate the max number of bits that flow into the decoder
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* in the interval of two frames
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*/
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X_PROD_Y_DIV_Z(ps_vbr_storage_vbv->i4_max_bit_rate, 1000, i4_tgt_frm_rate,
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ps_vbr_storage_vbv->i4_max_bits_per_tgt_frm);
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}
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