387 lines
18 KiB
C
387 lines
18 KiB
C
/******************************************************************************
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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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/* */
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/* File Name : ih264d_sei.c */
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/* */
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/* Description : This file contains routines to parse SEI NAL's */
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/* */
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/* List of Functions : <List the functions defined in this file> */
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/* */
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/* Issues / Problems : None */
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/* */
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/* Revision History : */
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/* */
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/* DD MM YYYY Author(s) Changes (Describe the changes made) */
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/* 25 05 2005 NS Draft */
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/* */
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/*****************************************************************************/
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#include "ih264_typedefs.h"
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#include "ih264_macros.h"
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#include "ih264_platform_macros.h"
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#include "ih264d_sei.h"
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#include "ih264d_bitstrm.h"
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#include "ih264d_structs.h"
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#include "ih264d_error_handler.h"
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#include "ih264d_vui.h"
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#include "ih264d_parse_cavlc.h"
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#include "ih264d_defs.h"
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/*****************************************************************************/
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/* */
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/* Function Name : ih264d_parse_buffering_period */
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/* */
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/* Description : This function parses SEI message buffering_period */
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/* Inputs : ps_buf_prd pointer to struct buf_period_t */
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/* ps_bitstrm Bitstream */
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/* Globals : None */
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/* Processing : Parses SEI payload buffering period. */
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/* Outputs : None */
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/* Returns : None */
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/* */
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/* Issues : Not implemented fully */
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/* */
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/* Revision History: */
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/* */
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/* DD MM YYYY Author(s) Changes (Describe the changes made) */
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/* 06 05 2002 NS Draft */
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/* */
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/*****************************************************************************/
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WORD32 ih264d_parse_buffering_period(buf_period_t *ps_buf_prd,
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dec_bit_stream_t *ps_bitstrm,
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dec_struct_t *ps_dec)
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{
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UWORD8 u1_seq_parameter_set_id;
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dec_seq_params_t *ps_seq;
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UWORD8 u1_nal_hrd_present, u1_vcl_hrd_present;
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UWORD32 i;
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UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst;
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UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer;
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UNUSED(ps_buf_prd);
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u1_seq_parameter_set_id = ih264d_uev(pu4_bitstrm_ofst,
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pu4_bitstrm_buf);
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if(u1_seq_parameter_set_id >= MAX_NUM_SEQ_PARAMS)
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return ERROR_INVALID_SEQ_PARAM;
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ps_seq = &ps_dec->ps_sps[u1_seq_parameter_set_id];
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if(TRUE != ps_seq->u1_is_valid)
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return (-1);
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ps_dec->ps_sei->u1_seq_param_set_id = u1_seq_parameter_set_id;
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ps_dec->ps_cur_sps = ps_seq;
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if(FALSE == ps_seq->u1_is_valid)
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return ERROR_INVALID_SEQ_PARAM;
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if(1 == ps_seq->u1_vui_parameters_present_flag)
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{
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u1_nal_hrd_present = ps_seq->s_vui.u1_nal_hrd_params_present;
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if(u1_nal_hrd_present)
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{
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for(i = 0; i < ps_seq->s_vui.s_nal_hrd.u4_cpb_cnt; i++)
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{
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ih264d_get_bits_h264(
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ps_bitstrm,
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ps_seq->s_vui.s_nal_hrd.u1_initial_cpb_removal_delay);
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ih264d_get_bits_h264(
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ps_bitstrm,
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ps_seq->s_vui.s_nal_hrd.u1_initial_cpb_removal_delay);
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}
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}
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u1_vcl_hrd_present = ps_seq->s_vui.u1_vcl_hrd_params_present;
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if(u1_vcl_hrd_present)
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{
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for(i = 0; i < ps_seq->s_vui.s_vcl_hrd.u4_cpb_cnt; i++)
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{
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ih264d_get_bits_h264(
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ps_bitstrm,
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ps_seq->s_vui.s_vcl_hrd.u1_initial_cpb_removal_delay);
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ih264d_get_bits_h264(
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ps_bitstrm,
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ps_seq->s_vui.s_vcl_hrd.u1_initial_cpb_removal_delay);
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}
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}
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}
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return OK;
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}
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/*****************************************************************************/
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/* */
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/* Function Name : ih264d_parse_pic_timing */
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/* */
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/* Description : This function parses SEI message pic_timing */
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/* Inputs : ps_bitstrm Bitstream */
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/* ps_dec Poniter decoder context */
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/* ui4_payload_size pay load i4_size */
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/* Globals : None */
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/* Processing : Parses SEI payload picture timing */
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/* Outputs : None */
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/* Returns : None */
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/* */
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/* Issues : Not implemented fully */
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/* */
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/* Revision History: */
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/* */
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/* DD MM YYYY Author(s) Changes (Describe the changes made) */
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/* 06 05 2002 NS Draft */
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/* */
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/*****************************************************************************/
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WORD32 ih264d_parse_pic_timing(dec_bit_stream_t *ps_bitstrm,
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dec_struct_t *ps_dec,
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UWORD32 ui4_payload_size)
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{
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sei *ps_sei;
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vui_t *ps_vu4;
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UWORD8 u1_cpb_dpb_present;
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UWORD8 u1_pic_struct_present_flag;
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UWORD32 u4_start_offset, u4_bits_consumed;
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UWORD8 u1_cpb_removal_delay_length, u1_dpb_output_delay_length;
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ps_sei = (sei *)ps_dec->ps_sei;
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ps_vu4 = &ps_dec->ps_cur_sps->s_vui;
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u1_cpb_dpb_present = ps_vu4->u1_vcl_hrd_params_present
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+ ps_vu4->u1_nal_hrd_params_present;
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if(ps_vu4->u1_vcl_hrd_params_present)
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{
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u1_cpb_removal_delay_length =
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ps_vu4->s_vcl_hrd.u1_cpb_removal_delay_length;
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u1_dpb_output_delay_length =
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ps_vu4->s_vcl_hrd.u1_dpb_output_delay_length;
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}
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else if(ps_vu4->u1_nal_hrd_params_present)
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{
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u1_cpb_removal_delay_length =
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ps_vu4->s_nal_hrd.u1_cpb_removal_delay_length;
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u1_dpb_output_delay_length =
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ps_vu4->s_nal_hrd.u1_dpb_output_delay_length;
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}
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else
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{
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u1_cpb_removal_delay_length = 24;
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u1_dpb_output_delay_length = 24;
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}
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u4_start_offset = ps_bitstrm->u4_ofst;
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if(u1_cpb_dpb_present)
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{
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ih264d_get_bits_h264(ps_bitstrm, u1_cpb_removal_delay_length);
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ih264d_get_bits_h264(ps_bitstrm, u1_dpb_output_delay_length);
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}
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u1_pic_struct_present_flag = ps_vu4->u1_pic_struct_present_flag;
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if(u1_pic_struct_present_flag)
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{
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ps_sei->u1_pic_struct = ih264d_get_bits_h264(ps_bitstrm, 4);
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ps_dec->u1_pic_struct_copy = ps_sei->u1_pic_struct;
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ps_sei->u1_is_valid = 1;
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}
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u4_bits_consumed = ps_bitstrm->u4_ofst - u4_start_offset;
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ih264d_flush_bits_h264(ps_bitstrm,
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(ui4_payload_size << 3) - u4_bits_consumed);
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return (0);
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}
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/*****************************************************************************/
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/* */
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/* Function Name : ih264d_parse_recovery_point */
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/* */
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/* Description : This function parses SEI message recovery point */
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/* Inputs : ps_bitstrm Bitstream */
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/* ps_dec Poniter decoder context */
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/* ui4_payload_size pay load i4_size */
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/* Globals : None */
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/* Processing : Parses SEI payload picture timing */
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/* Outputs : None */
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/* Returns : None */
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/* */
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/* Issues : Not implemented fully */
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/* */
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/* Revision History: */
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/* */
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/* DD MM YYYY Author(s) Changes (Describe the changes made) */
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/* 06 05 2002 NS Draft */
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/* */
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/*****************************************************************************/
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WORD32 ih264d_parse_recovery_point(dec_bit_stream_t *ps_bitstrm,
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dec_struct_t *ps_dec,
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UWORD32 ui4_payload_size)
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{
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sei *ps_sei = ps_dec->ps_sei;
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dec_err_status_t *ps_err = ps_dec->ps_dec_err_status;
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UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst;
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UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer;
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UNUSED(ui4_payload_size);
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ps_sei->u2_recovery_frame_cnt = ih264d_uev(pu4_bitstrm_ofst,
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pu4_bitstrm_buf);
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ps_err->u4_frm_sei_sync = ps_err->u4_cur_frm
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+ ps_sei->u2_recovery_frame_cnt;
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ps_sei->u1_exact_match_flag = ih264d_get_bit_h264(ps_bitstrm);
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ps_sei->u1_broken_link_flag = ih264d_get_bit_h264(ps_bitstrm);
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ps_sei->u1_changing_slice_grp_idc = ih264d_get_bits_h264(ps_bitstrm, 2);
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return (0);
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}
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/*****************************************************************************/
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/* */
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/* Function Name : ih264d_parse_sei_payload */
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/* */
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/* Description : This function parses SEI pay loads. Currently it's */
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/* implemented partially. */
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/* Inputs : ps_bitstrm Bitstream */
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/* ui4_payload_type SEI payload type */
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/* ui4_payload_size SEI payload i4_size */
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/* Globals : None */
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/* Processing : Parses SEI payloads units and stores the info */
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/* Outputs : None */
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/* Returns : None */
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/* */
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/* Issues : Not implemented fully */
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/* */
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/* Revision History: */
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/* */
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/* DD MM YYYY Author(s) Changes (Describe the changes made) */
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/* 06 05 2002 NS Draft */
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/* */
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/*****************************************************************************/
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WORD32 ih264d_parse_sei_payload(dec_bit_stream_t *ps_bitstrm,
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UWORD32 ui4_payload_type,
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UWORD32 ui4_payload_size,
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dec_struct_t *ps_dec)
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{
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sei *ps_sei;
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WORD32 i4_status = 0;
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ps_sei = (sei *)ps_dec->ps_sei;
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switch(ui4_payload_type)
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{
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case SEI_BUF_PERIOD:
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i4_status = ih264d_parse_buffering_period(&ps_sei->s_buf_period,
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ps_bitstrm, ps_dec);
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/*if(i4_status != OK)
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return i4_status;*/
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break;
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case SEI_PIC_TIMING:
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if(NULL == ps_dec->ps_cur_sps)
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ih264d_flush_bits_h264(ps_bitstrm, (ui4_payload_size << 3));
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else
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ih264d_parse_pic_timing(ps_bitstrm, ps_dec,
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ui4_payload_size);
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break;
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case SEI_RECOVERY_PT:
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ih264d_parse_recovery_point(ps_bitstrm, ps_dec,
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ui4_payload_size);
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break;
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default:
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ih264d_flush_bits_h264(ps_bitstrm, (ui4_payload_size << 3));
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break;
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}
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return (i4_status);
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}
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/*****************************************************************************/
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/* */
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/* Function Name : ih264d_parse_sei_message */
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/* */
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/* Description : This function is parses and decode SEI. Currently it's */
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/* not implemented fully. */
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/* Inputs : ps_dec Decoder parameters */
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/* ps_bitstrm Bitstream */
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/* Globals : None */
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/* Processing : Parses SEI NAL units and stores the info */
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/* Outputs : None */
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/* Returns : None */
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/* */
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/* Issues : Not implemented fully */
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/* */
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/* Revision History: */
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/* */
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/* DD MM YYYY Author(s) Changes (Describe the changes made) */
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/* 06 05 2002 NS Draft */
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/* */
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/*****************************************************************************/
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WORD32 ih264d_parse_sei_message(dec_struct_t *ps_dec,
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dec_bit_stream_t *ps_bitstrm)
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{
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UWORD32 ui4_payload_type, ui4_payload_size;
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UWORD32 u4_bits;
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WORD32 i4_status = 0;
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do
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{
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ui4_payload_type = 0;
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u4_bits = ih264d_get_bits_h264(ps_bitstrm, 8);
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while(0xff == u4_bits && !EXCEED_OFFSET(ps_bitstrm))
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{
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u4_bits = ih264d_get_bits_h264(ps_bitstrm, 8);
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ui4_payload_type += 255;
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}
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ui4_payload_type += u4_bits;
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ui4_payload_size = 0;
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u4_bits = ih264d_get_bits_h264(ps_bitstrm, 8);
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while(0xff == u4_bits && !EXCEED_OFFSET(ps_bitstrm))
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{
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u4_bits = ih264d_get_bits_h264(ps_bitstrm, 8);
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ui4_payload_size += 255;
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}
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ui4_payload_size += u4_bits;
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i4_status = ih264d_parse_sei_payload(ps_bitstrm, ui4_payload_type,
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ui4_payload_size, ps_dec);
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if(i4_status == -1)
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{
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i4_status = 0;
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break;
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}
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if(i4_status != OK)
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return i4_status;
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if(ih264d_check_byte_aligned(ps_bitstrm) == 0)
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{
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u4_bits = ih264d_get_bit_h264(ps_bitstrm);
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if(0 == u4_bits)
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{
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H264_DEC_DEBUG_PRINT("\nError in parsing SEI message");
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}
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while(0 == ih264d_check_byte_aligned(ps_bitstrm)
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&& !EXCEED_OFFSET(ps_bitstrm))
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{
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u4_bits = ih264d_get_bit_h264(ps_bitstrm);
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if(u4_bits)
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{
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H264_DEC_DEBUG_PRINT("\nError in parsing SEI message");
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}
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}
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}
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}
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while(ps_bitstrm->u4_ofst < ps_bitstrm->u4_max_ofst);
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return (i4_status);
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}
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