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 ih264d_flush_bits_h264(ps_bitstrm, 201 (ui4_payload_size << 3) - u4_bits_consumed); 202 203 return (0); 204 } 205 206 /*****************************************************************************/ 207 /* */ 208 /* Function Name : ih264d_parse_recovery_point */ 209 /* */ 210 /* Description : This function parses SEI message recovery point */ 211 /* Inputs : ps_bitstrm Bitstream */ 212 /* ps_dec Poniter decoder context */ 213 /* ui4_payload_size pay load i4_size */ 214 /* Globals : None */ 215 /* Processing : Parses SEI payload picture timing */ 216 /* Outputs : None */ 217 /* Returns : None */ 218 /* */ 219 /* Issues : Not implemented fully */ 220 /* */ 221 /* Revision History: */ 222 /* */ 223 /* DD MM YYYY Author(s) Changes (Describe the changes made) */ 224 /* 06 05 2002 NS Draft */ 225 /* */ 226 /*****************************************************************************/ 227 WORD32 ih264d_parse_recovery_point(dec_bit_stream_t *ps_bitstrm, 228 dec_struct_t *ps_dec, 229 UWORD32 ui4_payload_size) 230 { 231 sei *ps_sei = ps_dec->ps_sei; 232 dec_err_status_t *ps_err = ps_dec->ps_dec_err_status; 233 UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst; 234 UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer; 235 UNUSED(ui4_payload_size); 236 ps_sei->u2_recovery_frame_cnt = ih264d_uev(pu4_bitstrm_ofst, 237 pu4_bitstrm_buf); 238 ps_err->u4_frm_sei_sync = ps_err->u4_cur_frm 239 + ps_sei->u2_recovery_frame_cnt; 240 ps_sei->u1_exact_match_flag = ih264d_get_bit_h264(ps_bitstrm); 241 ps_sei->u1_broken_link_flag = ih264d_get_bit_h264(ps_bitstrm); 242 ps_sei->u1_changing_slice_grp_idc = ih264d_get_bits_h264(ps_bitstrm, 2); 243 244 return (0); 245 } 246 247 /*****************************************************************************/ 248 /* */ 249 /* Function Name : ih264d_parse_sei_payload */ 250 /* */ 251 /* Description : This function parses SEI pay loads. Currently it's */ 252 /* implemented partially. */ 253 /* Inputs : ps_bitstrm Bitstream */ 254 /* ui4_payload_type SEI payload type */ 255 /* ui4_payload_size SEI payload i4_size */ 256 /* Globals : None */ 257 /* Processing : Parses SEI payloads units and stores the info */ 258 /* Outputs : None */ 259 /* Returns : None */ 260 /* */ 261 /* Issues : Not implemented fully */ 262 /* */ 263 /* Revision History: */ 264 /* */ 265 /* DD MM YYYY Author(s) Changes (Describe the changes made) */ 266 /* 06 05 2002 NS Draft */ 267 /* */ 268 /*****************************************************************************/ 269 270 WORD32 ih264d_parse_sei_payload(dec_bit_stream_t *ps_bitstrm, 271 UWORD32 ui4_payload_type, 272 UWORD32 ui4_payload_size, 273 dec_struct_t *ps_dec) 274 { 275 sei *ps_sei; 276 WORD32 i4_status = 0; 277 ps_sei = (sei *)ps_dec->ps_sei; 278 switch(ui4_payload_type) 279 { 280 case SEI_BUF_PERIOD: 281 282 i4_status = ih264d_parse_buffering_period(&ps_sei->s_buf_period, 283 ps_bitstrm, ps_dec); 284 /*if(i4_status != OK) 285 return i4_status;*/ 286 break; 287 case SEI_PIC_TIMING: 288 if(NULL == ps_dec->ps_cur_sps) 289 ih264d_flush_bits_h264(ps_bitstrm, (ui4_payload_size << 3)); 290 else 291 ih264d_parse_pic_timing(ps_bitstrm, ps_dec, 292 ui4_payload_size); 293 break; 294 case SEI_RECOVERY_PT: 295 ih264d_parse_recovery_point(ps_bitstrm, ps_dec, 296 ui4_payload_size); 297 break; 298 default: 299 ih264d_flush_bits_h264(ps_bitstrm, (ui4_payload_size << 3)); 300 break; 301 } 302 return (i4_status); 303 } 304 305 /*****************************************************************************/ 306 /* */ 307 /* Function Name : ih264d_parse_sei_message */ 308 /* */ 309 /* Description : This function is parses and decode SEI. Currently it's */ 310 /* not implemented fully. */ 311 /* Inputs : ps_dec Decoder parameters */ 312 /* ps_bitstrm Bitstream */ 313 /* Globals : None */ 314 /* Processing : Parses SEI NAL units and stores the info */ 315 /* Outputs : None */ 316 /* Returns : None */ 317 /* */ 318 /* Issues : Not implemented fully */ 319 /* */ 320 /* Revision History: */ 321 /* */ 322 /* DD MM YYYY Author(s) Changes (Describe the changes made) */ 323 /* 06 05 2002 NS Draft */ 324 /* */ 325 /*****************************************************************************/ 326 327 WORD32 ih264d_parse_sei_message(dec_struct_t *ps_dec, 328 dec_bit_stream_t *ps_bitstrm) 329 { 330 UWORD32 ui4_payload_type, ui4_payload_size; 331 UWORD32 u4_bits; 332 WORD32 i4_status = 0; 333 334 do 335 { 336 ui4_payload_type = 0; 337 338 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 8); 339 while(0xff == u4_bits) 340 { 341 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 8); 342 ui4_payload_type += 255; 343 } 344 ui4_payload_type += u4_bits; 345 346 ui4_payload_size = 0; 347 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 8); 348 while(0xff == u4_bits) 349 { 350 u4_bits = ih264d_get_bits_h264(ps_bitstrm, 8); 351 ui4_payload_size += 255; 352 } 353 ui4_payload_size += u4_bits; 354 355 i4_status = ih264d_parse_sei_payload(ps_bitstrm, ui4_payload_type, 356 ui4_payload_size, ps_dec); 357 if(i4_status == -1) 358 { 359 i4_status = 0; 360 break; 361 } 362 363 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 { 375 u4_bits = ih264d_get_bit_h264(ps_bitstrm); 376 if(u4_bits) 377 { 378 H264_DEC_DEBUG_PRINT("\nError in parsing SEI message"); 379 } 380 } 381 } 382 } 383 while(ps_bitstrm->u4_ofst < ps_bitstrm->u4_max_ofst); 384 return (i4_status); 385 } 386 387
