Have some fun with Lua DSP
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198
share/scripts/a_dtmf_phone.lua
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198
share/scripts/a_dtmf_phone.lua
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ardour {
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["type"] = "dsp",
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name = "ACE DTMF Phone",
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category = "Instrument",
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license = "MIT",
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author = "Ardour Team",
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description = [[Ardour phone home]]
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}
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local r = 48000
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local p1 = 0
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local p2 = 0
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local tau = 2 * math.pi
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local active_note = -1
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local ringsize = 8
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function dsp_ioconfig ()
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return {
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{ midi_in = 1, audio_in = 0, audio_out = 1},
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{ midi_in = 1, audio_in = 0, audio_out = 2}
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}
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end
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function dsp_init (rate)
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r = rate
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-- allocate DSP -> GUI ringbuffer
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self:shmem():allocate (1 + ringsize)
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self:shmem():atomic_set_int (0, 0)
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local buffer = self:shmem():to_int(1):array()
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for i = 1, ringsize do
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buffer[i] = -1 -- empty slot
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end
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end
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-- https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling#Keypad
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local dtmf = {
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["1"] = {1209, 697},
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["2"] = {1336, 697},
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["3"] = {1447, 697},
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["A"] = {1633, 697},
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["4"] = {1209, 770},
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["5"] = {1336, 770},
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["6"] = {1447, 770},
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["B"] = {1633, 770},
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["7"] = {1209, 852},
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["8"] = {1336, 852},
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["9"] = {1447, 852},
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["C"] = {1633, 852},
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["*"] = {1209, 941},
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["0"] = {1336, 941},
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["#"] = {1447, 941},
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["D"] = {1633, 941},
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[" "] = {0, 0},
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}
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local map = { "1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "*", "#", "A", "B", "C", "D"}
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function midi_note_to_pad (n)
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-- map [1..9 0 * #] to 12TET, ignore A..D
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-- start at C == 1
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return map [1 + n % 12]
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end
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function dsp_run (ins, outs, n_samples)
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-- clear output buffer
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local a = {}
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for s = 1, n_samples do a[s] = 0 end
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local function synth (s_start, s_end)
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if active_note == -1 then
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return
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end
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local f = dtmf[midi_note_to_pad (active_note)]
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if f[1] == 0 then
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return
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end
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local i1 = f[1] / r
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local i2 = f[2] / r
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for s = s_start,s_end do
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a[s] = 0.5 * (math.sin (p1 * tau) + math.sin (p2 * tau))
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p1 = p1 + i1
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p2 = p2 + i2
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end
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end
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local newdata = false
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local tme = 1
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for _,b in pairs (midiin) do
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local t = b["time"] -- t = [ 1 .. n_samples ]
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-- synth sound until event
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synth (tme, t)
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tme = t + 1
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-- process MIDI events (ignore MIDI channel)
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local d = b["data"] -- get midi-event
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if (#d == 3 and (d[1] & 240) == 144) then -- note on
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--if active_note == -1 then
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active_note = d[2]
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p1, p2 = 0, 0
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-- inform UI
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local pos = self:shmem():atomic_get_int (0)
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local buffer = self:shmem():to_int(1):array()
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buffer[1 + pos] = active_note
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pos = (pos + 1) % ringsize
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self:shmem():atomic_set_int (0, pos)
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newdata = true
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--end
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end
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if (#d == 3 and (d[1] & 240) == 128) then -- note off
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if active_note == d[2] then
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active_note = -1
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end
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end
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if (#d == 3 and (d[1] & 240) == 176) then -- CC
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if (d[2] == 120 or d[2] == 123) then -- panic
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active_note = -1
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-- clear UI
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self:shmem():atomic_set_int (0, 0)
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local buffer = self:shmem():to_int(1):array()
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for i = 1, ringsize do
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buffer[i] = -1 -- empty slot
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end
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newdata = true
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end
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end
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end
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-- synth rest of cycle
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synth (tme, n_samples)
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-- keep phase between 0..tau
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p1 = math.fmod (p1, 1)
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p2 = math.fmod (p2, 1)
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-- set all outputs
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for c = 1,#outs do
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outs[c]:set_table (a, n_samples)
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end
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if newdata then
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self:queue_draw ()
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end
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end
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-----------------
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-- inline display
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-----------------
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local txt = nil -- a pango context
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local vpadding = 2
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local displayheight = 0
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local linewidth = 0
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function render_inline (ctx, displaywidth, max_h)
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local pos = self:shmem():atomic_get_int(0)
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local buffer = self:shmem():to_int(1):array()
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local str = ""
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for i = 1, ringsize do
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local p = (i + pos + ringsize - 1) % ringsize
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local n = buffer[1 + p]
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if n ~= -1 and " " ~= midi_note_to_pad (n) then
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str = str .. midi_note_to_pad (n)
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end
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end
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if not txt then
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txt = Cairo.PangoLayout (ctx, "Mono 10")
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-- compute the size of the display
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local siz = ""
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for i = 1, ringsize do
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siz = siz .. "0"
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end
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txt:set_text (siz)
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local lineheight
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linewidth, lineheight = txt:get_pixel_size()
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displayheight = math.min (2 * vpadding + lineheight, max_h)
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end
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-- clear background
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ctx:rectangle (0, 0, displaywidth, displayheight)
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ctx:set_source_rgba (.2, .2, .2, 1.0)
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ctx:fill ()
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-- show dialed number
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ctx:set_source_rgba (1.0, 1.0, 1.0, 1.0)
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txt:set_text (str)
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ctx:move_to (math.floor (.5 * (displaywidth - linewidth)), vpadding)
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txt:show_in_cairo_context (ctx)
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return {displaywidth, displayheight}
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end
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