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66 lines
2.6 KiB
Markdown
66 lines
2.6 KiB
Markdown
<h1>Repair or reformat record (.sdriq) files</h1>
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<h2>Usage</h2>
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This utility attempts to repair .sdriq files that have their header corrupted or with a pre version 4.2.1 header. Since version 4.2.1 a CRC32 checksum is present and the file will not be played if the check of the header content against the CRC32 fails.
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The header is composed as follows:
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- Sample rate in S/s (4 bytes, 32 bits)
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- Center frequency in Hz (8 bytes, 64 bits)
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- Start time Unix timestamp epoch in seconds (8 bytes, 64 bits)
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- Sample size as 16 or 24 bits (4 bytes, 32 bits)
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- filler with all zeroes (4 bytes, 32 bits)
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- CRC32 (IEEE) of the 28 bytes above (4 bytes, 32 bits)
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The header size is 32 bytes in total which is a multiple of 8 bytes thus occupies an integer number of samples whether in 16 or 24 bits mode. When migrating from a pre version 4.2.1 header you may crunch a very small amount of samples.
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You can replace values in the header with the following options:
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- -sr uint
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Sample rate (S/s)
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- -cf uint
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Center frequency (Hz)
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- -ts string
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start time RFC3339 (ex: 2006-01-02T15:04:05Z)
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- -now
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use now for start time
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- -sz uint
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Sample size (16 or 24) (default 16)
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You need to specify an input file. If no output file is specified the current header values are printed to the console and the program exits:
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- -in string
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input file (default "foo")
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To convert to a new file you need to specify the output file:
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- -out string
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output file (default "foo")
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You can specify a block size in multiples of 4k for the copy. Large blocks will yield a faster copy but a larger output file. With the default of 1 (4k) the copy does not take much time anyway:
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- -bz uint
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Copy block size in multiple of 4k (default 1)
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<h2>Build</h2>
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The program is written in go and is provided only in source code form. Compiling it is very easy:
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<h3>Install go</h3>
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You will usually find a `golang` package in your distribution. For example in Ubuntu or Debian you can install it with `sudo apt-get install golang`. You can find binary distributions for many systems at the [Go download site](https://golang.org/dl/)
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<h3>Build the program</h3>
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In this directory just do `go build`
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<h3>Unit testing</h3>
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Unit test (very simple) is located in `rescuesdriq_test.go`. It uses the [Go Convey](https://github.com/smartystreets/goconvey) framework. You should first install it with:
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`go get github.com/smartystreets/goconvey`
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You can run unit test from command line with: `go test`
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Or with the Go Convey server that you start from this directory with: `$GOPATH/bin/goconvey` where `$GOPATH` is the path to your go installation.
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