| 38 | using namespace parser::reader; |
| 39 | |
| 40 | void nal_unit_header::parse(SubByteReaderLogging &reader) |
| 41 | { |
| 42 | SubByteReaderLoggingSubLevel subLevel(reader, "header_code()"); |
| 43 | |
| 44 | { |
| 45 | Options opt; |
| 46 | opt.meaningMap[0] = "picture_start_code"; |
| 47 | // 01 through AF |
| 48 | for (int i = 0x01; i < 0xaf; i++) |
| 49 | opt.meaningMap[i] = "slice_start_code - slice " + std::to_string(i); |
| 50 | opt.meaningMap[176] = "reserved"; |
| 51 | opt.meaningMap[177] = "reserved"; |
| 52 | opt.meaningMap[178] = "user_data_start_code"; |
| 53 | opt.meaningMap[179] = "sequence_header_code"; |
| 54 | opt.meaningMap[180] = "sequence_error_code"; |
| 55 | opt.meaningMap[181] = "extension_start_code"; |
| 56 | opt.meaningMap[182] = "reserved"; |
| 57 | opt.meaningMap[183] = "sequence_end_code"; |
| 58 | opt.meaningMap[184] = "group_start_code"; |
| 59 | opt.meaningMap[185] = "system start codes"; |
| 60 | |
| 61 | this->start_code_value = reader.readBits("start_code_value", 8, opt); |
| 62 | } |
| 63 | |
| 64 | if (this->start_code_value == 0) |
| 65 | this->nal_unit_type = NalType::PICTURE; |
| 66 | else if (this->start_code_value >= 0x01 && this->start_code_value <= 0xaf) |
| 67 | { |
| 68 | this->nal_unit_type = NalType::SLICE; |
| 69 | this->slice_id = this->start_code_value - 1; |
| 70 | } |
| 71 | else if (this->start_code_value == 0xb0 || this->start_code_value == 0xb1 || |
| 72 | this->start_code_value == 0xb6) |
| 73 | this->nal_unit_type = NalType::RESERVED; |
| 74 | else if (this->start_code_value == 0xb2) |
| 75 | this->nal_unit_type = NalType::USER_DATA; |
| 76 | else if (this->start_code_value == 0xb3) |
| 77 | this->nal_unit_type = NalType::SEQUENCE_HEADER; |
| 78 | else if (this->start_code_value == 0xb4) |
| 79 | this->nal_unit_type = NalType::SEQUENCE_ERROR; |
| 80 | else if (this->start_code_value == 0xb5) |
| 81 | this->nal_unit_type = NalType::EXTENSION_START; |
| 82 | else if (this->start_code_value == 0xb7) |
| 83 | this->nal_unit_type = NalType::SEQUENCE_END; |
| 84 | else if (this->start_code_value == 0xb8) |
| 85 | this->nal_unit_type = NalType::GROUP_START; |
| 86 | else if (this->start_code_value >= 0xb9) |
| 87 | { |
| 88 | this->nal_unit_type = NalType::SYSTEM_START_CODE; |
| 89 | this->system_start_codes = this->start_code_value - 0xb9; |
| 90 | } |
| 91 | else |
| 92 | this->nal_unit_type = NalType::UNSPECIFIED; |
| 93 | } |
| 94 | |
| 95 | } // namespace parser::mpeg2 |