Convert a wave file that has for some odd reason both stereo channels interlaced on the left channel and an empty right channel

wavedeinterlace

require 'rubygems'
require 'wav-file'

f = open("test_48khz_c2_s32_le_stereo_on_ch1.wav")
format = WavFile::readFormat(f)
dataChunk = WavFile::readDataChunk(f)
f.close

puts format

bit = 'l*' if format.bitPerSample == 32 # int16_t
bit = 's*' if format.bitPerSample == 16 # int16_t
bit = 'c*' if format.bitPerSample == 8 # signed char
wavs = dataChunk.data.unpack(bit) # read binary
wav2 = []

wavs.each_slice(4) do |left, right, left2, right2|
  #right = left2;
  wav2 << [left, left2]
end

dataChunk.data = wav2.flatten.reverse.pack(bit)


open("output.wav", "w"){|out|
  WavFile::write(out, format, [dataChunk])
}