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