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livetrax/share/scripts/ltc_reader.lua

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ardour {
["type"] = "dsp",
name = "LTC Reader",
category = "Utility",
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author = "Ardour Team",
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license = "MIT",
description = [[Linear Timecode Decoder with mixer strip inline display]]
}
function dsp_ioconfig ()
return { { audio_in = 1, audio_out = 1}, }
end
function dsp_init (rate)
timeout = rate
samplerate = rate
ltc_reader = ARDOUR.DSP.LTCReader (rate / 25, ARDOUR.DSP.LTC_TV_STANDARD.LTC_TV_FILM_24)
self:shmem():allocate(5)
end
function dsp_run (ins, outs, n_samples)
if ins[1] ~= outs[1] then
ARDOUR.DSP.copy_vector (outs[1]:offset (0), ins[1]:offset (0), n_samples)
end
ltc_reader:write (ins[1]:offset (0), n_samples, 0)
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timeout = timeout + n_samples
local to_ui = self:shmem():to_int(0):array()
local rv
repeat
local tc
rv, tc = ltc_reader:read (0, 0, 0, 0)
if rv >= 0 then
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timeout = 0
self:shmem():atomic_set_int (0, 1)
self:shmem():atomic_set_int (1, tc[1])
self:shmem():atomic_set_int (2, tc[2])
self:shmem():atomic_set_int (3, tc[3])
self:shmem():atomic_set_int (4, tc[4])
self:queue_draw ()
end
until rv < 0
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if timeout > samplerate then
if 0 ~= self:shmem():atomic_get_int (0) then
self:shmem():atomic_set_int (0, 0)
self:queue_draw ()
end
end
end
-------------------------------------------------------------------------------
-- inline UI
--
local txt = nil -- a pango context
local vpadding = 2
function render_inline (ctx, displaywidth, max_h)
if not txt then
txt = Cairo.PangoLayout (ctx, "Mono 10px")
end
local d = self:shmem():to_int(0):array()
if d[1] == 0 then
txt:set_text("--:--:--:--")
else
txt:set_text(string.format("%02d:%02d:%02d:%02d", d[2], d[3], d[4], d[5]))
end
-- compute the size of the display
local txtwidth, lineheight = txt:get_pixel_size()
local displayheight = math.min(vpadding + (lineheight + vpadding), max_h)
-- clear background
ctx:rectangle (0, 0, displaywidth, displayheight)
ctx:set_source_rgba (.2, .2, .2, 1.0)
ctx:fill ()
ctx:set_source_rgba (.8, .8, .8, 1.0)
ctx:move_to ((displaywidth - txtwidth) / 2, 1)
txt:show_in_cairo_context (ctx)
return {displaywidth, displayheight}
end