1 /****************************************************************************** 2 * 3 * Copyright (C) 2015 The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at: 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 ***************************************************************************** 18 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore 19 */ 20 21 /*****************************************************************************/ 22 /* */ 23 /* File Name : ih264d_vui.c */ 24 /* */ 25 /* Description : This file contains routines to parse VUI NAL's */ 26 /* */ 27 /* List of Functions : <List the functions defined in this file> */ 28 /* */ 29 /* Issues / Problems : None */ 30 /* */ 31 /* Revision History : */ 32 /* */ 33 /* DD MM YYYY Author(s) Changes (Describe the changes made) */ 34 /* 25 05 2005 NS Draft */ 35 /* */ 36 /*****************************************************************************/ 37 38 #include "ih264_typedefs.h" 39 #include "ih264_macros.h" 40 #include "ih264_platform_macros.h" 41 #include "ih264d_vui.h" 42 #include "ih264d_bitstrm.h" 43 #include "ih264d_parse_cavlc.h" 44 #include "ih264d_structs.h" 45 #include "ih264d_error_handler.h" 46 47 /*****************************************************************************/ 48 /* */ 49 /* Function Name : ih264d_parse_hrd_parametres */ 50 /* */ 51 /* Description : This function parses hrd_t parametres */ 52 /* Inputs : ps_hrd pointer to HRD params */ 53 /* ps_bitstrm Bitstream */ 54 /* Globals : None */ 55 /* Processing : Parses HRD params */ 56 /* Outputs : None */ 57 /* Returns : None */ 58 /* */ 59 /* Issues : None */ 60 /* */ 61 /* Revision History: */ 62 /* */ 63 /* DD MM YYYY Author(s) Changes (Describe the changes made) */ 64 /* 06 05 2002 NS Draft */ 65 /* */ 66 /*****************************************************************************/ 67 68 WORD32 ih264d_parse_hrd_parametres(hrd_t *ps_hrd, 69 dec_bit_stream_t *ps_bitstrm) 70 { 71 UWORD8 u1_index; 72 UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst; 73 UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer; 74 75 ps_hrd->u4_cpb_cnt = 1 76 + ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf); 77 if(ps_hrd->u4_cpb_cnt > 31) 78 return ERROR_INV_SPS_PPS_T; 79 ps_hrd->u1_bit_rate_scale = ih264d_get_bits_h264(ps_bitstrm, 4); 80 ps_hrd->u1_cpb_size_scale = ih264d_get_bits_h264(ps_bitstrm, 4); 81 82 for(u1_index = 0; u1_index < (UWORD8)ps_hrd->u4_cpb_cnt; u1_index++) 83 { 84 ps_hrd->u4_bit_rate[u1_index] = 1 85 + ih264d_uev(pu4_bitstrm_ofst, 86 pu4_bitstrm_buf); 87 ps_hrd->u4_cpb_size[u1_index] = 1 88 + ih264d_uev(pu4_bitstrm_ofst, 89 pu4_bitstrm_buf); 90 ps_hrd->u1_cbr_flag[u1_index] = ih264d_get_bits_h264(ps_bitstrm, 1); 91 } 92 93 ps_hrd->u1_initial_cpb_removal_delay = 1 94 + ih264d_get_bits_h264(ps_bitstrm, 5); 95 ps_hrd->u1_cpb_removal_delay_length = 1 96 + ih264d_get_bits_h264(ps_bitstrm, 5); 97 ps_hrd->u1_dpb_output_delay_length = 1 98 + ih264d_get_bits_h264(ps_bitstrm, 5); 99 ps_hrd->u1_time_offset_length = ih264d_get_bits_h264(ps_bitstrm, 5); 100 101 return OK; 102 } 103 104 /*****************************************************************************/ 105 /* */ 106 /* Function Name : ih264d_parse_vui_parametres */ 107 /* */ 108 /* Description : This function parses VUI NALs. */ 109 /* Inputs : ps_vu4 pointer to VUI params */ 110 /* ps_bitstrm Bitstream */ 111 /* Globals : None */ 112 /* Processing : Parses VUI NAL's units and stores the info */ 113 /* Outputs : None */ 114 /* Returns : None */ 115 /* */ 116 /* Issues : None */ 117 /* */ 118 /* Revision History: */ 119 /* */ 120 /* DD MM YYYY Author(s) Changes (Describe the changes made) */ 121 /* 06 05 2002 NS Draft */ 122 /* */ 123 /*****************************************************************************/ 124 125 WORD32 ih264d_parse_vui_parametres(vui_t *ps_vu4, 126 dec_bit_stream_t *ps_bitstrm) 127 { 128 UWORD8 u4_bits; 129 UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst; 130 UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer; 131 WORD32 ret; 132 133 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); 134 if(u4_bits) 135 { 136 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 8); 137 ps_vu4->u1_aspect_ratio_idc = (UWORD8)u4_bits; 138 if(VUI_EXTENDED_SAR == u4_bits) 139 { 140 ps_vu4->u2_sar_width = ih264d_get_bits_h264(ps_bitstrm, 16); 141 ps_vu4->u2_sar_height = ih264d_get_bits_h264(ps_bitstrm, 16); 142 } 143 } 144 145 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); 146 if(u4_bits) 147 { 148 ps_vu4->u1_overscan_appropriate_flag = ih264d_get_bits_h264( 149 ps_bitstrm, 1); 150 } 151 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); 152 /* Initialize to unspecified (5 for video_format and 153 2 for colour_primaries, tfr_chars, matrix_coeffs */ 154 ps_vu4->u1_video_format = 5; 155 ps_vu4->u1_video_full_range_flag = 0; 156 ps_vu4->u1_colour_primaries = 2; 157 ps_vu4->u1_tfr_chars = 2; 158 ps_vu4->u1_matrix_coeffs = 2; 159 160 if(u4_bits) 161 { 162 ps_vu4->u1_video_format = ih264d_get_bits_h264(ps_bitstrm, 3); 163 ps_vu4->u1_video_full_range_flag = ih264d_get_bits_h264(ps_bitstrm, 164 1); 165 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); 166 if(u4_bits) 167 { 168 ps_vu4->u1_colour_primaries = ih264d_get_bits_h264(ps_bitstrm, 169 8); 170 ps_vu4->u1_tfr_chars = ih264d_get_bits_h264(ps_bitstrm, 8); 171 ps_vu4->u1_matrix_coeffs = ih264d_get_bits_h264(ps_bitstrm, 8); 172 } 173 } 174 175 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); 176 if(u4_bits) 177 { 178 ps_vu4->u1_cr_top_field = ih264d_uev(pu4_bitstrm_ofst, 179 pu4_bitstrm_buf); 180 ps_vu4->u1_cr_bottom_field = ih264d_uev(pu4_bitstrm_ofst, 181 pu4_bitstrm_buf); 182 } 183 184 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); 185 if(u4_bits) 186 { 187 ps_vu4->u4_num_units_in_tick = ih264d_get_bits_h264(ps_bitstrm, 32); 188 ps_vu4->u4_time_scale = ih264d_get_bits_h264(ps_bitstrm, 32); 189 ps_vu4->u1_fixed_frame_rate_flag = ih264d_get_bits_h264(ps_bitstrm, 190 1); 191 } 192 193 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); 194 ps_vu4->u1_nal_hrd_params_present = u4_bits; 195 if(u4_bits) 196 { 197 ret = ih264d_parse_hrd_parametres(&ps_vu4->s_nal_hrd, ps_bitstrm); 198 if(ret != OK) 199 return ret; 200 } 201 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 1); 202 ps_vu4->u1_vcl_hrd_params_present = u4_bits; 203 if(u4_bits) 204 { 205 ret = ih264d_parse_hrd_parametres(&ps_vu4->s_vcl_hrd, ps_bitstrm); 206 if(ret != OK) 207 return ret; 208 } 209 210 if(ps_vu4->u1_nal_hrd_params_present || u4_bits) 211 { 212 ps_vu4->u1_low_delay_hrd_flag = ih264d_get_bits_h264(ps_bitstrm, 1); 213 } 214 ps_vu4->u1_pic_struct_present_flag = ih264d_get_bits_h264(ps_bitstrm, 1); 215 216 ps_vu4->u1_bitstream_restriction_flag = ih264d_get_bits_h264(ps_bitstrm, 1); 217 218 if(ps_vu4->u1_bitstream_restriction_flag) 219 { 220 ps_vu4->u1_mv_over_pic_boundaries_flag = ih264d_get_bits_h264( 221 ps_bitstrm, 1); 222 ps_vu4->u4_max_bytes_per_pic_denom = ih264d_uev(pu4_bitstrm_ofst, 223 pu4_bitstrm_buf); 224 ps_vu4->u4_max_bits_per_mb_denom = ih264d_uev(pu4_bitstrm_ofst, 225 pu4_bitstrm_buf); 226 ps_vu4->u4_log2_max_mv_length_horz = ih264d_uev(pu4_bitstrm_ofst, 227 pu4_bitstrm_buf); 228 ps_vu4->u4_log2_max_mv_length_vert = ih264d_uev(pu4_bitstrm_ofst, 229 pu4_bitstrm_buf); 230 ps_vu4->u4_num_reorder_frames = ih264d_uev(pu4_bitstrm_ofst, 231 pu4_bitstrm_buf); 232 ps_vu4->u4_max_dec_frame_buffering = ih264d_uev(pu4_bitstrm_ofst, 233 pu4_bitstrm_buf); 234 if((ps_vu4->u4_max_dec_frame_buffering > (H264_MAX_REF_PICS * 2)) || 235 (ps_vu4->u4_num_reorder_frames > ps_vu4->u4_max_dec_frame_buffering)) 236 { 237 return ERROR_INV_SPS_PPS_T; 238 } 239 } 240 else 241 { 242 /* Setting this to a large value if not present */ 243 ps_vu4->u4_num_reorder_frames = 64; 244 ps_vu4->u4_max_dec_frame_buffering = 64; 245 } 246 247 return OK; 248 } 249
