/****************************************************************************** * * 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_vui.c */ /* */ /* Description : This file contains routines to parse VUI NAL's */ /* */ /* List of Functions : */ /* */ /* 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_vui.h" #include "ih264d_bitstrm.h" #include "ih264d_parse_cavlc.h" #include "ih264d_structs.h" #include "ih264d_error_handler.h" /*****************************************************************************/ /* */ /* Function Name : ih264d_parse_hrd_parametres */ /* */ /* Description : This function parses hrd_t parametres */ /* Inputs : ps_hrd pointer to HRD params */ /* ps_bitstrm Bitstream */ /* Globals : None */ /* Processing : Parses HRD params */ /* Outputs : None */ /* Returns : None */ /* */ /* Issues : None */ /* */ /* Revision History: */ /* */ /* DD MM YYYY Author(s) Changes (Describe the changes made) */ /* 06 05 2002 NS Draft */ /* */ /*****************************************************************************/ WORD32 ih264d_parse_hrd_parametres(hrd_t *ps_hrd, dec_bit_stream_t *ps_bitstrm) { UWORD8 u1_index; UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst; UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer; ps_hrd->u4_cpb_cnt = 1 + ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf); if(ps_hrd->u4_cpb_cnt > 31) return ERROR_INV_SPS_PPS_T; ps_hrd->u1_bit_rate_scale = ih264d_get_bits_h264(ps_bitstrm, 4); ps_hrd->u1_cpb_size_scale = ih264d_get_bits_h264(ps_bitstrm, 4); for(u1_index = 0; u1_index < (UWORD8)ps_hrd->u4_cpb_cnt; u1_index++) { ps_hrd->u4_bit_rate[u1_index] = 1 + ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf); ps_hrd->u4_cpb_size[u1_index] = 1 + ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf); ps_hrd->u1_cbr_flag[u1_index] = ih264d_get_bits_h264(ps_bitstrm, 1); } ps_hrd->u1_initial_cpb_removal_delay = 1 + ih264d_get_bits_h264(ps_bitstrm, 5); ps_hrd->u1_cpb_removal_delay_length = 1 + ih264d_get_bits_h264(ps_bitstrm, 5); ps_hrd->u1_dpb_output_delay_length = 1 + ih264d_get_bits_h264(ps_bitstrm, 5); ps_hrd->u1_time_offset_length = ih264d_get_bits_h264(ps_bitstrm, 5); return OK; } /*****************************************************************************/ /* */ /* Function Name : ih264d_parse_vui_parametres */ /* */ /* Description : This function parses VUI NALs. */ /* Inputs : ps_vu4 pointer to VUI params */ /* ps_bitstrm Bitstream */ /* Globals : None */ /* Processing : Parses VUI NAL's units and stores the info */ /* Outputs : None */ /* Returns : None */ /* */ /* Issues : None */ /* */ /* Revision History: */ /* */ /* DD MM YYYY Author(s) Changes (Describe the changes made) */ /* 06 05 2002 NS Draft */ /* */ /*****************************************************************************/ WORD32 ih264d_parse_vui_parametres(vui_t *ps_vu4, dec_bit_stream_t *ps_bitstrm) { UWORD8 u4_bits; UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst; UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer; WORD32 ret; u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); if(u4_bits) { u4_bits = ih264d_get_bits_h264(ps_bitstrm, 8); ps_vu4->u1_aspect_ratio_idc = (UWORD8)u4_bits; if(VUI_EXTENDED_SAR == u4_bits) { ps_vu4->u2_sar_width = ih264d_get_bits_h264(ps_bitstrm, 16); ps_vu4->u2_sar_height = ih264d_get_bits_h264(ps_bitstrm, 16); } } u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); if(u4_bits) { ps_vu4->u1_overscan_appropriate_flag = ih264d_get_bits_h264( ps_bitstrm, 1); } u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); /* Initialize to unspecified (5 for video_format and 2 for colour_primaries, tfr_chars, matrix_coeffs */ ps_vu4->u1_video_format = 5; ps_vu4->u1_video_full_range_flag = 0; ps_vu4->u1_colour_primaries = 2; ps_vu4->u1_tfr_chars = 2; ps_vu4->u1_matrix_coeffs = 2; if(u4_bits) { ps_vu4->u1_video_format = ih264d_get_bits_h264(ps_bitstrm, 3); ps_vu4->u1_video_full_range_flag = ih264d_get_bits_h264(ps_bitstrm, 1); u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); if(u4_bits) { ps_vu4->u1_colour_primaries = ih264d_get_bits_h264(ps_bitstrm, 8); ps_vu4->u1_tfr_chars = ih264d_get_bits_h264(ps_bitstrm, 8); ps_vu4->u1_matrix_coeffs = ih264d_get_bits_h264(ps_bitstrm, 8); } } u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); if(u4_bits) { ps_vu4->u1_cr_top_field = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf); ps_vu4->u1_cr_bottom_field = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf); } u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); if(u4_bits) { ps_vu4->u4_num_units_in_tick = ih264d_get_bits_h264(ps_bitstrm, 32); ps_vu4->u4_time_scale = ih264d_get_bits_h264(ps_bitstrm, 32); ps_vu4->u1_fixed_frame_rate_flag = ih264d_get_bits_h264(ps_bitstrm, 1); } u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); ps_vu4->u1_nal_hrd_params_present = u4_bits; if(u4_bits) { ret = ih264d_parse_hrd_parametres(&ps_vu4->s_nal_hrd, ps_bitstrm); if(ret != OK) return ret; } u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); ps_vu4->u1_vcl_hrd_params_present = u4_bits; if(u4_bits) { ret = ih264d_parse_hrd_parametres(&ps_vu4->s_vcl_hrd, ps_bitstrm); if(ret != OK) return ret; } if(ps_vu4->u1_nal_hrd_params_present || u4_bits) { ps_vu4->u1_low_delay_hrd_flag = ih264d_get_bits_h264(ps_bitstrm, 1); } ps_vu4->u1_pic_struct_present_flag = ih264d_get_bits_h264(ps_bitstrm, 1); ps_vu4->u1_bitstream_restriction_flag = ih264d_get_bits_h264(ps_bitstrm, 1); if(ps_vu4->u1_bitstream_restriction_flag) { ps_vu4->u1_mv_over_pic_boundaries_flag = ih264d_get_bits_h264( ps_bitstrm, 1); ps_vu4->u4_max_bytes_per_pic_denom = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf); ps_vu4->u4_max_bits_per_mb_denom = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf); ps_vu4->u4_log2_max_mv_length_horz = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf); ps_vu4->u4_log2_max_mv_length_vert = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf); ps_vu4->u4_num_reorder_frames = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf); ps_vu4->u4_max_dec_frame_buffering = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf); if((ps_vu4->u4_max_dec_frame_buffering > (H264_MAX_REF_PICS * 2)) || (ps_vu4->u4_num_reorder_frames > ps_vu4->u4_max_dec_frame_buffering)) { return ERROR_INV_SPS_PPS_T; } } else { /* Setting this to a large value if not present */ ps_vu4->u4_num_reorder_frames = 64; ps_vu4->u4_max_dec_frame_buffering = 64; } return OK; }