RTL-SDR IQ sample reader
ocaml-rtlsdr: defer file I/O behind read_capture / with_meta
The README example called [Rtlsdr.of_file "capture.raw"] at top level,
so mdx execution failed [Sys_error: No such file or directory]. Wrap
the IO into [read_capture path] and [with_meta path] functions and
switch [Printf.printf] to [Fmt.pr], adding [fmt] to the mdx libraries.
+15
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README.md
+14
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README.md
···
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## Usage
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```ocaml
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(* Read IQ samples from a raw capture file *)
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let src = Rtlsdr.of_file "capture.raw"
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let () = Printf.printf "%d samples available\n" (Rtlsdr.sample_count src)
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let samples = Rtlsdr.read src 4096
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let () = Rtlsdr.close src
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(* Read IQ samples from a raw capture file. *)
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let read_capture path =
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let src = Rtlsdr.of_file path in
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Fmt.pr "%d samples available@." (Rtlsdr.sample_count src);
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let samples = Rtlsdr.read src 4096 in
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Rtlsdr.close src;
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samples
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(* Attach recording metadata *)
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let meta =
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Rtlsdr.of_file "capture.raw"
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(* Attach recording metadata. *)
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let with_meta path =
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Rtlsdr.of_file path
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|> Rtlsdr.with_metadata
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{ center_freq = 137.5e6; sample_rate = 2.4e6; gain = 40.0 }
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(* Generate a synthetic BPSK signal for testing *)
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(* Generate a synthetic BPSK signal for testing. *)
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let bits = Bytes.of_string "\x01\x00\x01\x01\x00"
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let iq =
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Rtlsdr.generate_bpsk
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~sample_rate:48000.0 ~symbol_rate:1200.0
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~bits ~carrier_freq:1800.0
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Rtlsdr.generate_bpsk ~sample_rate:48000.0 ~symbol_rate:1200.0 ~bits
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~carrier_freq:1800.0
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```
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## API Overview