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Exzap
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248
dependencies/ih264d/decoder/ih264d_vui.c
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248
dependencies/ih264d/decoder/ih264d_vui.c
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/******************************************************************************
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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_vui.c */
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/* */
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/* Description : This file contains routines to parse VUI 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_vui.h"
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#include "ih264d_bitstrm.h"
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#include "ih264d_parse_cavlc.h"
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#include "ih264d_structs.h"
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#include "ih264d_error_handler.h"
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/*****************************************************************************/
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/* */
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/* Function Name : ih264d_parse_hrd_parametres */
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/* */
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/* Description : This function parses hrd_t parametres */
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/* Inputs : ps_hrd pointer to HRD params */
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/* ps_bitstrm Bitstream */
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/* Globals : None */
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/* Processing : Parses HRD params */
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/* Outputs : None */
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/* Returns : None */
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/* */
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/* Issues : 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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/* 06 05 2002 NS Draft */
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/* */
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/*****************************************************************************/
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WORD32 ih264d_parse_hrd_parametres(hrd_t *ps_hrd,
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dec_bit_stream_t *ps_bitstrm)
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{
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UWORD8 u1_index;
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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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ps_hrd->u4_cpb_cnt = 1
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+ ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);
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if(ps_hrd->u4_cpb_cnt > 31)
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return ERROR_INV_SPS_PPS_T;
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ps_hrd->u1_bit_rate_scale = ih264d_get_bits_h264(ps_bitstrm, 4);
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ps_hrd->u1_cpb_size_scale = ih264d_get_bits_h264(ps_bitstrm, 4);
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for(u1_index = 0; u1_index < (UWORD8)ps_hrd->u4_cpb_cnt; u1_index++)
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{
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ps_hrd->u4_bit_rate[u1_index] = 1
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+ ih264d_uev(pu4_bitstrm_ofst,
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pu4_bitstrm_buf);
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ps_hrd->u4_cpb_size[u1_index] = 1
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+ ih264d_uev(pu4_bitstrm_ofst,
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pu4_bitstrm_buf);
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ps_hrd->u1_cbr_flag[u1_index] = ih264d_get_bits_h264(ps_bitstrm, 1);
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}
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ps_hrd->u1_initial_cpb_removal_delay = 1
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+ ih264d_get_bits_h264(ps_bitstrm, 5);
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ps_hrd->u1_cpb_removal_delay_length = 1
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+ ih264d_get_bits_h264(ps_bitstrm, 5);
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ps_hrd->u1_dpb_output_delay_length = 1
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+ ih264d_get_bits_h264(ps_bitstrm, 5);
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ps_hrd->u1_time_offset_length = ih264d_get_bits_h264(ps_bitstrm, 5);
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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_vui_parametres */
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/* */
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/* Description : This function parses VUI NALs. */
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/* Inputs : ps_vu4 pointer to VUI params */
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/* ps_bitstrm Bitstream */
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/* Globals : None */
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/* Processing : Parses VUI NAL's 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 : 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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/* 06 05 2002 NS Draft */
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/* */
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/*****************************************************************************/
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WORD32 ih264d_parse_vui_parametres(vui_t *ps_vu4,
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dec_bit_stream_t *ps_bitstrm)
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{
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UWORD8 u4_bits;
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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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WORD32 ret;
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u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1);
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if(u4_bits)
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{
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u4_bits = ih264d_get_bits_h264(ps_bitstrm, 8);
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ps_vu4->u1_aspect_ratio_idc = (UWORD8)u4_bits;
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if(VUI_EXTENDED_SAR == u4_bits)
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{
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ps_vu4->u2_sar_width = ih264d_get_bits_h264(ps_bitstrm, 16);
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ps_vu4->u2_sar_height = ih264d_get_bits_h264(ps_bitstrm, 16);
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}
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}
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u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1);
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if(u4_bits)
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{
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ps_vu4->u1_overscan_appropriate_flag = ih264d_get_bits_h264(
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ps_bitstrm, 1);
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}
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u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1);
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/* Initialize to unspecified (5 for video_format and
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2 for colour_primaries, tfr_chars, matrix_coeffs */
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ps_vu4->u1_video_format = 5;
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ps_vu4->u1_video_full_range_flag = 0;
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ps_vu4->u1_colour_primaries = 2;
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ps_vu4->u1_tfr_chars = 2;
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ps_vu4->u1_matrix_coeffs = 2;
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if(u4_bits)
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{
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ps_vu4->u1_video_format = ih264d_get_bits_h264(ps_bitstrm, 3);
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ps_vu4->u1_video_full_range_flag = ih264d_get_bits_h264(ps_bitstrm,
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1);
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u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1);
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if(u4_bits)
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{
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ps_vu4->u1_colour_primaries = ih264d_get_bits_h264(ps_bitstrm,
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8);
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ps_vu4->u1_tfr_chars = ih264d_get_bits_h264(ps_bitstrm, 8);
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ps_vu4->u1_matrix_coeffs = ih264d_get_bits_h264(ps_bitstrm, 8);
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}
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}
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u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1);
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if(u4_bits)
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{
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ps_vu4->u1_cr_top_field = ih264d_uev(pu4_bitstrm_ofst,
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pu4_bitstrm_buf);
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ps_vu4->u1_cr_bottom_field = ih264d_uev(pu4_bitstrm_ofst,
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pu4_bitstrm_buf);
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}
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u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1);
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if(u4_bits)
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{
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ps_vu4->u4_num_units_in_tick = ih264d_get_bits_h264(ps_bitstrm, 32);
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ps_vu4->u4_time_scale = ih264d_get_bits_h264(ps_bitstrm, 32);
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ps_vu4->u1_fixed_frame_rate_flag = ih264d_get_bits_h264(ps_bitstrm,
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1);
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}
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u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1);
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ps_vu4->u1_nal_hrd_params_present = u4_bits;
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if(u4_bits)
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{
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ret = ih264d_parse_hrd_parametres(&ps_vu4->s_nal_hrd, ps_bitstrm);
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if(ret != OK)
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return ret;
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}
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u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1);
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ps_vu4->u1_vcl_hrd_params_present = u4_bits;
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if(u4_bits)
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{
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ret = ih264d_parse_hrd_parametres(&ps_vu4->s_vcl_hrd, ps_bitstrm);
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if(ret != OK)
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return ret;
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}
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if(ps_vu4->u1_nal_hrd_params_present || u4_bits)
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{
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ps_vu4->u1_low_delay_hrd_flag = ih264d_get_bits_h264(ps_bitstrm, 1);
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}
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ps_vu4->u1_pic_struct_present_flag = ih264d_get_bits_h264(ps_bitstrm, 1);
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ps_vu4->u1_bitstream_restriction_flag = ih264d_get_bits_h264(ps_bitstrm, 1);
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if(ps_vu4->u1_bitstream_restriction_flag)
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{
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ps_vu4->u1_mv_over_pic_boundaries_flag = ih264d_get_bits_h264(
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ps_bitstrm, 1);
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ps_vu4->u4_max_bytes_per_pic_denom = ih264d_uev(pu4_bitstrm_ofst,
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pu4_bitstrm_buf);
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ps_vu4->u4_max_bits_per_mb_denom = ih264d_uev(pu4_bitstrm_ofst,
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pu4_bitstrm_buf);
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ps_vu4->u4_log2_max_mv_length_horz = ih264d_uev(pu4_bitstrm_ofst,
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pu4_bitstrm_buf);
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ps_vu4->u4_log2_max_mv_length_vert = ih264d_uev(pu4_bitstrm_ofst,
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pu4_bitstrm_buf);
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ps_vu4->u4_num_reorder_frames = ih264d_uev(pu4_bitstrm_ofst,
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pu4_bitstrm_buf);
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ps_vu4->u4_max_dec_frame_buffering = ih264d_uev(pu4_bitstrm_ofst,
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pu4_bitstrm_buf);
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if((ps_vu4->u4_max_dec_frame_buffering > (H264_MAX_REF_PICS * 2)) ||
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(ps_vu4->u4_num_reorder_frames > ps_vu4->u4_max_dec_frame_buffering))
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{
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return ERROR_INV_SPS_PPS_T;
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}
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}
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else
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{
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/* Setting this to a large value if not present */
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ps_vu4->u4_num_reorder_frames = 64;
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ps_vu4->u4_max_dec_frame_buffering = 64;
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}
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return OK;
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}
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