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59 lines
2.4 KiB
Markdown
59 lines
2.4 KiB
Markdown
<h1>File sink plugin</h1>
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<h2>Introduction</h2>
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This output sample sink plugin sends its samples to file in the SDRangel .sdriq format.
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The format is S16LE I/Q samples. Thus there are 4 bytes per sample. I and Q values are 16 bit signed integers. The file starts with a context header containing information about center frequency, sample rate and timestamp of the start of the recording. This header has a length which is a multiple of a sample size (normally 24 bytes thus 6 samples). Thus this file can be used as a raw I/Q file with S16LE samples tolerating a glitch at the start corresponding to the 6 "random" samples. For example in GNURadio you can simply specify your file source format as short complex.
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You can also zap the 24 bytes header with this Linux command: `tail -c +25 myfile.sdriq > myfile.raw`
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To convert in another format you may use the sox utility. For example to convert to 32 bit (float) complex samples do: `sox -r 48k −b 16 −e signed-integer -c 2 myfile.raw -e float -c 2 myfilec.raw`
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Note that you have to specify the sampling rate and use .raw for the file extensions.
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<h2>Build</h2>
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The plugin is always built.
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<h2>Interface</h2>
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<h3>1: Start/Stop</h3>
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Device start / stop button.
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- Blue triangle icon: device is ready and can be started
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- Red square icon: device is running and can be stopped
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- Magenta (or pink) square icon: an error occured
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<h3>2: File stream sample rate</h3>
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This is the file stream sample rate in kS/s after interpolation (4) from the baseband stream. Thus this is the sample rate (7) multiplied by the interpolation factor (6).
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<h3>3: Frequency</h3>
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This is the center frequency in kHz that will be put in the file header.
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<h3>4: Output file selection</h3>
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Use this file dialog to specify the output file.
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<h3>5: File name</h3>
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This is the file path of the output file.
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<h3>6: Interpolation factor</h3>
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The baseband stream is interpolated by this value before being written to file. It can vary in powers of two from 1 (no interpolation) to 64.
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<h3>7: Baseband sample rate</h3>
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This is the baseband sample rate before interpolation in S/s.
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Use the wheels to adjust the sample rate. Left click on a digit sets the cursor position at this digit. Right click on a digit sets all digits on the right to zero. This effectively floors value at the digit position.
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<h3>8: Time counter</h3>
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This is the recording time count in HH:MM:SS.SSS |