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-- ; -*- mode: Lua -*-
-- First, you collect necessary pieces
local A, Fi, Fo = ...
-- (1) A is an opaque structure representing our Scoring Assistant host side;
-- all you need to do with it is pass it as the first arg to all calls
-- of Fi and Fo (see below).
-- (2) Fi, a CFunction, is the proxy to get any data related to or describing
-- the montage being scored. It has the signature (think syscall):
-- Fi( A, opcode, arg1, arg2, ...)
-- These are the supported opcodes:
-- 1. Informational.
local op_get_channel_list = 1
local op_get_channel_list_of_type = 2
local op_get_channel_data = 3
-- 2. Metrics describing a page:
local op_get_psd = 100
local op_get_mc = 101
local op_get_swu = 102
local op_get_signal_envelope = 103
local op_get_page_dirty = 104
-- For convenience, here are wrappers
-- common notes:
-- (a) on error, Fi returns {false, error_string}; else, results as described below;
-- (b) all page parameters are 1-baaed.
function get_channel_list ()
-- returns: n_channels, ch1, ch2, ...
return Fi(A, op_get_channel_list)
end
function get_channel_list_of_type (t)
-- args: t: signal type, e.g., "EEG", "EOG", etc.
-- returns: n_channels, ch1, ch2, ...
return Fi(A, op_get_channel_list_of_type, t)
end
function get_channel_data (h)
-- args: h: channel, e.g., "Fz"
-- returns: n_full_pages, n_total_pages, pagesize, samplerate
return Fi(A, op_get_channel_data, h)
end
function get_psd (h, pa, pz, fa, fz)
-- args: h: channel, e.g., "Fz",
-- pa, pz: starting and ending pages, inclusive;
-- fa, fz: frequncy range to extract PSD in.
-- returns: a vector of numbers.
return Fi(A, op_get_psd, h, pa-1, pz-1, fa, fz)
end
function get_mc (h, pa, pz, fa, _)
-- args: h, channel, e.g., "Fz",
-- pa, pz: start and end pages, inclusive;
-- fa: f0 range to extract MC at.
-- returns: a vector of numbers.
return Fi(A, op_get_psd, h, pa-1, pz-1, fa, _)
end
function get_swu (h, pa, pz, fa, _)
-- args: h: channel, e.g., "Fz",
-- pa, pz: starting and ending pages, inclusive;
-- fa: frequncy to extract SWU at.
-- returns: a vector of numbers.
return Fi(A, op_get_psd, h, pa-1, pz-1, fa, _)
end
function get_signal_envelope (h, p, scope, dt)
-- args: h: channel, e.g., "Fz",
-- p: page,
-- scope: envelope scope (tightness) parameter, sec (1 should be OK),
-- dt: time resolution of resulting vector
-- returns: a vector of signal envelope breadth values, taken at dt intervals.
return Fi(A, op_get_signal_envelope, h, p-1, scope, dt)
end
function get_page_dirty (h, p)
-- args: h: channel, e.g., "Fz",
-- p: page,
-- returns: a portion [0..1] of signal on page p in channel h marked as artifact
return Fi(A, op_get_page_dirty, h, p-1)
end
-- (3) Fo, also a CFunction, is used to deliver the scoring decision to the host
local nrem1 = 1
local nrem2 = 2
local nrem3 = 3
local nrem4 = 4
local rem = 5
local wake = 6
function put_score (p, s)
-- args: p: page, 1-based
-- s: score code as above
-- returns: nothing
return Fo(A, p-1, s)
end
--
-- function main
--
local cc = {get_channel_list_of_type ("EEG")}
print( string.format( "Montage has %d EEG channels", cc[1]))
local H = cc[2]
local nf, np, ps, sr = get_channel_data (H)
print( string.format( "Looking at channel %q: %d full pages (%d total) @%d sec, samplerate %d", H, nf, np, ps, sr))
local delta = {get_psd (H, 1, nf, 2, 3)}
local theta = {get_psd (H, 1, nf, 4, 8)}
local n_scored = 0
for p=1,nf-1 do
-- dirty = get_page_dirty(H, p)
-- if dirty > 0 then
-- print( string.format("p %d dirty (%g)", p, dirty))
-- end
-- print( get_signal_envelope(H, p, 1, 1))
if delta[p] > theta[p] * 1.5 then
n_scored = n_scored+1
-- print( "mark page ", p)
put_score (p, nrem3)
end
end
print( string.format("scored %d pages", n_scored))
print("")
return n_scored
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