Class: PWN::SDR::Decoder::LTE::PBCHIQ

Inherits:
Object
  • Object
show all
Defined in:
lib/pwn/sdr/decoder/lte.rb

Overview

Optional native implementation; never compiles or fetches at runtime. ABI contains only flat scalar buffers, not version-sensitive structs.

Direct Known Subclasses

AcquiredPBCHIQ

Instance Method Summary collapse

Constructor Details

#initialize(pci:) ⇒ PBCHIQ

Returns a new instance of PBCHIQ.



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# File 'lib/pwn/sdr/decoder/lte.rb', line 21

def initialize(pci:)
  @pci = pci
  @buffer = []
  path = File.expand_path("../../../../ext/pwn_lte/libpwn_lte.#{RbConfig::CONFIG.fetch('DLEXT')}", __dir__)
  @native = Module.new do
    extend ::FFI::Library

    ffi_lib path
    attach_function :pwn_lte_pbch, %i[pointer uint uint pointer pointer pointer], :int
  end
rescue LoadError => e
  raise LoadError, "LTE PBCH native backend unavailable; build ext/pwn_lte/build.rb against srsRAN_4G: #{e.message}"
end

Instance Method Details

#feed_iq(samples, rate: nil) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/pwn/sdr/decoder/lte.rb', line 35

def feed_iq(samples, rate: nil)
  raise ArgumentError, 'PBCH requires 1.92 Msps' if rate && rate != FS_BASE

  @buffer.concat(samples)
  while @buffer.length >= 3840
    frame = decode_subframe(@buffer.shift(3840))
    yield frame if frame
  end
end

#flush ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/pwn/sdr/decoder/lte.rb', line 45

def flush
  raise ArgumentError, 'truncated LTE subframe zero (requires 1920 complex samples)' unless @buffer.empty?
end