| 78 | } |
| 79 | |
| 80 | bool checkForObuFormat(QByteArray &data) |
| 81 | { |
| 82 | // TODO: We already have an implementation of this in the parser |
| 83 | // That should also be used here so we only have one place where we parse OBUs. |
| 84 | try |
| 85 | { |
| 86 | size_t posInData = 0; |
| 87 | while (posInData + 2 <= size_t(data.length())) |
| 88 | { |
| 89 | parser::reader::SubByteReaderLogging reader( |
| 90 | parser::reader::SubByteReaderLogging::convertToByteVector(data), nullptr, "", posInData); |
| 91 | |
| 92 | QString bitsRead; |
| 93 | auto forbiddenBit = reader.readFlag("obu_forbidden_bit"); |
| 94 | if (forbiddenBit) |
| 95 | return false; |
| 96 | auto obu_type = reader.readBits("obu_type", 4); |
| 97 | if (obu_type == 0 || (obu_type >= 9 && obu_type <= 14)) |
| 98 | // RESERVED obu types should not occur (highly unlikely) |
| 99 | return false; |
| 100 | auto obu_extension_flag = reader.readFlag("obu_extension_flag"); |
| 101 | auto obu_has_size_field = reader.readFlag("obu_has_size_field"); |
| 102 | reader.readFlag("obu_reserved_1bit", parser::reader::Options().withCheckEqualTo(1)); |
| 103 | |
| 104 | if (obu_extension_flag) |
| 105 | { |
| 106 | reader.readBits("temporal_id", 3); |
| 107 | reader.readBits("spatial_id", 2); |
| 108 | reader.readBits( |
| 109 | "extension_header_reserved_3bits", 3, parser::reader::Options().withCheckEqualTo(0)); |
| 110 | } |
| 111 | size_t obu_size; |
| 112 | if (obu_has_size_field) |
| 113 | { |
| 114 | obu_size = reader.readLEB128("obu_size"); |
| 115 | } |
| 116 | else |
| 117 | { |
| 118 | obu_size = (size_t(data.size()) - posInData) - 1 - (obu_extension_flag ? 1 : 0); |
| 119 | } |
| 120 | posInData += obu_size + reader.nrBytesRead(); |
| 121 | } |
| 122 | } |
| 123 | catch (...) |
| 124 | { |
| 125 | return false; |
| 126 | } |
| 127 | return true; |
| 128 | } |
| 129 | |
| 130 | } // namespace |
| 131 |
no test coverage detected