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| Both sides previous revision Previous revision Next revision | Previous revision | ||
| public:documents:raw_olap_data_formats [2012-03-20 09:50] – Jan David Mol | public:documents:raw_olap_data_formats [2017-03-08 15:27] (current) – external edit 127.0.0.1 | ||
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| - | ===== Raw OLAP data formats ==== | + | ===== Raw OLAP data formats |
| OLAP produces several data formats, which are intended to be replaced by their final format, such as HDF5. | OLAP produces several data formats, which are intended to be replaced by their final format, such as HDF5. | ||
| Line 78: | Line 78: | ||
| </ | </ | ||
| - | ===== Before 2011-20-24 ===== | + | ===== Before 2011-10-24 ===== |
| Data can be recorded as either complex voltages (yielding X and Y polarisations) or one or more stokes. In either case, a sequence of blocks will be stored, each of which consists of a header and data. The header is defined as: | Data can be recorded as either complex voltages (yielding X and Y polarisations) or one or more stokes. In either case, a sequence of blocks will be stored, each of which consists of a header and data. The header is defined as: | ||
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| A BFRaw file starts with a file header containing the configuration: | A BFRaw file starts with a file header containing the configuration: | ||
| - | < | + | < |
| struct file_header | struct file_header | ||
| { | { | ||
| Line 243: | Line 243: | ||
| After the file header, there is a series of blocks until the end of file, configured using values from the file header: | After the file header, there is a series of blocks until the end of file, configured using values from the file header: | ||
| - | < | + | < |
| struct block | struct block | ||
| // 0x2913D852 | // 0x2913D852 | ||
| Line 280: | Line 280: | ||
| To convert a TimeStamp-compatible int64_t to a C-readable timestamp, use | To convert a TimeStamp-compatible int64_t to a C-readable timestamp, use | ||
| - | < | + | < |
| /* clockspeed is in Hz */ | /* clockspeed is in Hz */ | ||
| int64 nanoseconds = (int64) (timestamp * 1024 * 1e9 / clockspeed); | int64 nanoseconds = (int64) (timestamp * 1024 * 1e9 / clockspeed); | ||