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_sei.c */ 24 /* */ 25 /* Description : This file contains routines to parse SEI 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_sei.h" 42 #include "ih264d_bitstrm.h" 43 #include "ih264d_structs.h" 44 #include "ih264d_error_handler.h" 45 #include "ih264d_vui.h" 46 #include "ih264d_parse_cavlc.h" 47 #include "ih264d_defs.h" 48 49 /*****************************************************************************/ 50 /* */ 51 /* Function Name : ih264d_parse_buffering_period */ 52 /* */ 53 /* Description : This function parses SEI message buffering_period */ 54 /* Inputs : ps_buf_prd pointer to struct buf_period_t */ 55 /* ps_bitstrm Bitstream */ 56 /* Globals : None */ 57 /* Processing : Parses SEI payload buffering period. */ 58 /* Outputs : None */ 59 /* Returns : None */ 60 /* */ 61 /* Issues : Not implemented fully */ 62 /* */ 63 /* Revision History: */ 64 /* */ 65 /* DD MM YYYY Author(s) Changes (Describe the changes made) */ 66 /* 06 05 2002 NS Draft */ 67 /* */ 68 /*****************************************************************************/ 69 70 WORD32 ih264d_parse_buffering_period(buf_period_t *ps_buf_prd, 71 dec_bit_stream_t *ps_bitstrm, 72 dec_struct_t *ps_dec) 73 { 74 UWORD8 u1_seq_parameter_set_id; 75 dec_seq_params_t *ps_seq; 76 UWORD8 u1_nal_hrd_present, u1_vcl_hrd_present; 77 UWORD32 i; 78 UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst; 79 UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer; 80 UNUSED(ps_buf_prd); 81 u1_seq_parameter_set_id = ih264d_uev(pu4_bitstrm_ofst, 82 pu4_bitstrm_buf); 83 if(u1_seq_parameter_set_id >= MAX_NUM_SEQ_PARAMS) 84 return ERROR_INVALID_SEQ_PARAM; 85 ps_seq = &ps_dec->ps_sps[u1_seq_parameter_set_id]; 86 if(TRUE != ps_seq->u1_is_valid) 87 return (-1); 88 89 ps_dec->ps_sei->u1_seq_param_set_id = u1_seq_parameter_set_id; 90 ps_dec->ps_cur_sps = ps_seq; 91 if(FALSE == ps_seq->u1_is_valid) 92 return ERROR_INVALID_SEQ_PARAM; 93 if(1 == ps_seq->u1_vui_parameters_present_flag) 94 { 95 u1_nal_hrd_present = ps_seq->s_vui.u1_nal_hrd_params_present; 96 if(u1_nal_hrd_present) 97 { 98 for(i = 0; i < ps_seq->s_vui.s_nal_hrd.u4_cpb_cnt; i++) 99 { 100 ih264d_get_bits_h264( 101 ps_bitstrm, 102 ps_seq->s_vui.s_nal_hrd.u1_initial_cpb_removal_delay); 103 ih264d_get_bits_h264( 104 ps_bitstrm, 105 ps_seq->s_vui.s_nal_hrd.u1_initial_cpb_removal_delay); 106 } 107 } 108 109 u1_vcl_hrd_present = ps_seq->s_vui.u1_vcl_hrd_params_present; 110 if(u1_vcl_hrd_present) 111 { 112 for(i = 0; i < ps_seq->s_vui.s_vcl_hrd.u4_cpb_cnt; i++) 113 { 114 ih264d_get_bits_h264( 115 ps_bitstrm, 116 ps_seq->s_vui.s_vcl_hrd.u1_initial_cpb_removal_delay); 117 ih264d_get_bits_h264( 118 ps_bitstrm, 119 ps_seq->s_vui.s_vcl_hrd.u1_initial_cpb_removal_delay); 120 } 121 } 122 } 123 return OK; 124 } 125 126 /*****************************************************************************/ 127 /* */ 128 /* Function Name : ih264d_parse_pic_timing */ 129 /* */ 130 /* Description : This function parses SEI message pic_timing */ 131 /* Inputs : ps_bitstrm Bitstream */ 132 /* ps_dec Poniter decoder context */ 133 /* ui4_payload_size pay load i4_size */ 134 /* Globals : None */ 135 /* Processing : Parses SEI payload picture timing */ 136 /* Outputs : None */ 137 /* Returns : None */ 138 /* */ 139 /* Issues : Not implemented fully */ 140 /* */ 141 /* Revision History: */ 142 /* */ 143 /* DD MM YYYY Author(s) Changes (Describe the changes made) */ 144 /* 06 05 2002 NS Draft */ 145 /* */ 146 /*****************************************************************************/ 147 WORD32 ih264d_parse_pic_timing(dec_bit_stream_t *ps_bitstrm, 148 dec_struct_t *ps_dec, 149 UWORD32 ui4_payload_size) 150 { 151 sei *ps_sei; 152 vui_t *ps_vu4; 153 UWORD8 u1_cpb_dpb_present; 154 UWORD8 u1_pic_struct_present_flag; 155 UWORD32 u4_start_offset, u4_bits_consumed; 156 UWORD8 u1_cpb_removal_delay_length, u1_dpb_output_delay_length; 157 158 ps_sei = (sei *)ps_dec->ps_sei; 159 ps_vu4 = &ps_dec->ps_cur_sps->s_vui; 160 161 u1_cpb_dpb_present = ps_vu4->u1_vcl_hrd_params_present 162 + ps_vu4->u1_nal_hrd_params_present; 163 164 if(ps_vu4->u1_vcl_hrd_params_present) 165 { 166 u1_cpb_removal_delay_length = 167 ps_vu4->s_vcl_hrd.u1_cpb_removal_delay_length; 168 u1_dpb_output_delay_length = 169 ps_vu4->s_vcl_hrd.u1_dpb_output_delay_length; 170 } 171 else if(ps_vu4->u1_nal_hrd_params_present) 172 { 173 u1_cpb_removal_delay_length = 174 ps_vu4->s_nal_hrd.u1_cpb_removal_delay_length; 175 u1_dpb_output_delay_length = 176 ps_vu4->s_nal_hrd.u1_dpb_output_delay_length; 177 } 178 else 179 { 180 u1_cpb_removal_delay_length = 24; 181 u1_dpb_output_delay_length = 24; 182 183 } 184 185 u4_start_offset = ps_bitstrm->u4_ofst; 186 if(u1_cpb_dpb_present) 187 { 188 ih264d_get_bits_h264(ps_bitstrm, u1_cpb_removal_delay_length); 189 ih264d_get_bits_h264(ps_bitstrm, u1_dpb_output_delay_length); 190 } 191 192 u1_pic_struct_present_flag = ps_vu4->u1_pic_struct_present_flag; 193 if(u1_pic_struct_present_flag) 194 { 195 ps_sei->u1_pic_struct = ih264d_get_bits_h264(ps_bitstrm, 4); 196 ps_dec->u1_pic_struct_copy = ps_sei->u1_pic_struct; 197 ps_sei->u1_is_valid = 1; 198 } 199 u4_bits_consumed = ps_bitstrm->u4_ofst - u4_start_offset; 200 201 if((ui4_payload_size << 3) < u4_bits_consumed) 202 return ERROR_CORRUPTED_SLICE; 203 204 ih264d_flush_bits_h264(ps_bitstrm, 205 (ui4_payload_size << 3) - u4_bits_consumed); 206 207 return (0); 208 } 209 210 /*****************************************************************************/ 211 /* */ 212 /* Function Name : ih264d_parse_recovery_point */ 213 /* */ 214 /* Description : This function parses SEI message recovery point */ 215 /* Inputs : ps_bitstrm Bitstream */ 216 /* ps_dec Poniter decoder context */ 217 /* ui4_payload_size pay load i4_size */ 218 /* Globals : None */ 219 /* Processing : Parses SEI payload picture timing */ 220 /* Outputs : None */ 221 /* Returns : None */ 222 /* */ 223 /* Issues : Not implemented fully */ 224 /* */ 225 /* Revision History: */ 226 /* */ 227 /* DD MM YYYY Author(s) Changes (Describe the changes made) */ 228 /* 06 05 2002 NS Draft */ 229 /* */ 230 /*****************************************************************************/ 231 WORD32 ih264d_parse_recovery_point(dec_bit_stream_t *ps_bitstrm, 232 dec_struct_t *ps_dec, 233 UWORD32 ui4_payload_size) 234 { 235 sei *ps_sei = ps_dec->ps_sei; 236 dec_err_status_t *ps_err = ps_dec->ps_dec_err_status; 237 UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst; 238 UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer; 239 UNUSED(ui4_payload_size); 240 ps_sei->u2_recovery_frame_cnt = ih264d_uev(pu4_bitstrm_ofst, 241 pu4_bitstrm_buf); 242 ps_err->u4_frm_sei_sync = ps_err->u4_cur_frm 243 + ps_sei->u2_recovery_frame_cnt; 244 ps_sei->u1_exact_match_flag = ih264d_get_bit_h264(ps_bitstrm); 245 ps_sei->u1_broken_link_flag = ih264d_get_bit_h264(ps_bitstrm); 246 ps_sei->u1_changing_slice_grp_idc = ih264d_get_bits_h264(ps_bitstrm, 2); 247 248 return (0); 249 } 250 251 /*****************************************************************************/ 252 /* */ 253 /* Function Name : ih264d_parse_sei_payload */ 254 /* */ 255 /* Description : This function parses SEI pay loads. Currently it's */ 256 /* implemented partially. */ 257 /* Inputs : ps_bitstrm Bitstream */ 258 /* ui4_payload_type SEI payload type */ 259 /* ui4_payload_size SEI payload i4_size */ 260 /* Globals : None */ 261 /* Processing : Parses SEI payloads units and stores the info */ 262 /* Outputs : None */ 263 /* Returns : None */ 264 /* */ 265 /* Issues : Not implemented fully */ 266 /* */ 267 /* Revision History: */ 268 /* */ 269 /* DD MM YYYY Author(s) Changes (Describe the changes made) */ 270 /* 06 05 2002 NS Draft */ 271 /* */ 272 /*****************************************************************************/ 273 274 WORD32 ih264d_parse_sei_payload(dec_bit_stream_t *ps_bitstrm, 275 UWORD32 ui4_payload_type, 276 UWORD32 ui4_payload_size, 277 dec_struct_t *ps_dec) 278 { 279 sei *ps_sei; 280 WORD32 i4_status = 0; 281 ps_sei = (sei *)ps_dec->ps_sei; 282 283 if(ui4_payload_size == 0) 284 return -1; 285 286 switch(ui4_payload_type) 287 { 288 case SEI_BUF_PERIOD: 289 290 i4_status = ih264d_parse_buffering_period(&ps_sei->s_buf_period, 291 ps_bitstrm, ps_dec); 292 break; 293 case SEI_PIC_TIMING: 294 if(NULL == ps_dec->ps_cur_sps) 295 i4_status = ih264d_flush_bits_h264(ps_bitstrm, (ui4_payload_size << 3)); 296 else 297 i4_status = ih264d_parse_pic_timing(ps_bitstrm, ps_dec, 298 ui4_payload_size); 299 break; 300 case SEI_RECOVERY_PT: 301 i4_status = ih264d_parse_recovery_point(ps_bitstrm, ps_dec, 302 ui4_payload_size); 303 break; 304 default: 305 i4_status = ih264d_flush_bits_h264(ps_bitstrm, (ui4_payload_size << 3)); 306 break; 307 } 308 return (i4_status); 309 } 310 311 /*****************************************************************************/ 312 /* */ 313 /* Function Name : ih264d_parse_sei_message */ 314 /* */ 315 /* Description : This function is parses and decode SEI. Currently it's */ 316 /* not implemented fully. */ 317 /* Inputs : ps_dec Decoder parameters */ 318 /* ps_bitstrm Bitstream */ 319 /* Globals : None */ 320 /* Processing : Parses SEI NAL units and stores the info */ 321 /* Outputs : None */ 322 /* Returns : None */ 323 /* */ 324 /* Issues : Not implemented fully */ 325 /* */ 326 /* Revision History: */ 327 /* */ 328 /* DD MM YYYY Author(s) Changes (Describe the changes made) */ 329 /* 06 05 2002 NS Draft */ 330 /* */ 331 /*****************************************************************************/ 332 333 WORD32 ih264d_parse_sei_message(dec_struct_t *ps_dec, 334 dec_bit_stream_t *ps_bitstrm) 335 { 336 UWORD32 ui4_payload_type, ui4_payload_size; 337 UWORD32 u4_bits; 338 WORD32 i4_status = 0; 339 340 do 341 { 342 ui4_payload_type = 0; 343 344 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 8); 345 while(0xff == u4_bits && !EXCEED_OFFSET(ps_bitstrm)) 346 { 347 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 8); 348 ui4_payload_type += 255; 349 } 350 ui4_payload_type += u4_bits; 351 352 ui4_payload_size = 0; 353 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 8); 354 while(0xff == u4_bits && !EXCEED_OFFSET(ps_bitstrm)) 355 { 356 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 8); 357 ui4_payload_size += 255; 358 } 359 ui4_payload_size += u4_bits; 360 361 i4_status = ih264d_parse_sei_payload(ps_bitstrm, ui4_payload_type, 362 ui4_payload_size, ps_dec); 363 if(i4_status != OK) 364 return i4_status; 365 366 if(ih264d_check_byte_aligned(ps_bitstrm) == 0) 367 { 368 u4_bits = ih264d_get_bit_h264(ps_bitstrm); 369 if(0 == u4_bits) 370 { 371 H264_DEC_DEBUG_PRINT("\nError in parsing SEI message"); 372 } 373 while(0 == ih264d_check_byte_aligned(ps_bitstrm) 374 && !EXCEED_OFFSET(ps_bitstrm)) 375 { 376 u4_bits = ih264d_get_bit_h264(ps_bitstrm); 377 if(u4_bits) 378 { 379 H264_DEC_DEBUG_PRINT("\nError in parsing SEI message"); 380 } 381 } 382 } 383 } 384 while(ps_bitstrm->u4_ofst < ps_bitstrm->u4_max_ofst); 385 return (i4_status); 386 } 387 388
