Robin Gareus
9697187037
Some music using square waves can inadvertently be interpreted as valid LTC frame. However the encoded data is not a valid timecode, which can lead huge A/V offsets, or other issues.
83 lines
2.1 KiB
Lua
83 lines
2.1 KiB
Lua
ardour {
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["type"] = "dsp",
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name = "LTC Reader",
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category = "Utility",
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author = "Ardour Team",
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license = "MIT",
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description = [[Linear Timecode (LTC) Decoder with mixer strip inline display]]
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}
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function dsp_ioconfig ()
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return { { audio_in = 1, audio_out = 1}, }
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end
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function dsp_init (rate)
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timeout = rate
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samplerate = rate
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ltc_reader = ARDOUR.DSP.LTCReader (rate / 25, ARDOUR.DSP.LTC_TV_STANDARD.LTC_TV_FILM_24)
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self:shmem():allocate(5)
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end
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function dsp_run (ins, outs, n_samples)
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if ins[1] ~= outs[1] then
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ARDOUR.DSP.copy_vector (outs[1]:offset (0), ins[1]:offset (0), n_samples)
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end
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ltc_reader:write (ins[1]:offset (0), n_samples, 0)
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timeout = timeout + n_samples
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local to_ui = self:shmem():to_int(0):array()
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local rv
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repeat
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local tc
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rv, tc = ltc_reader:read (0, 0, 0, 0, 0)
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if rv >= 0 then
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timeout = 0
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self:shmem():atomic_set_int (0, 1)
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self:shmem():atomic_set_int (1, tc[1])
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self:shmem():atomic_set_int (2, tc[2])
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self:shmem():atomic_set_int (3, tc[3])
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self:shmem():atomic_set_int (4, tc[4])
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self:queue_draw ()
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end
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until rv < 0
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if timeout > samplerate then
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if 0 ~= self:shmem():atomic_get_int (0) then
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self:shmem():atomic_set_int (0, 0)
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self:queue_draw ()
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end
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end
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end
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-------------------------------------------------------------------------------
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-- inline UI
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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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function render_inline (ctx, displaywidth, max_h)
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if not txt then
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txt = Cairo.PangoLayout (ctx, "Mono 10px")
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end
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local d = self:shmem():to_int(0):array()
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if d[1] == 0 then
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txt:set_text("--:--:--:--")
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else
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txt:set_text(string.format("%02d:%02d:%02d:%02d", d[2], d[3], d[4], d[5]))
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end
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-- compute the size of the display
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local txtwidth, lineheight = txt:get_pixel_size()
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local displayheight = math.min(vpadding + (lineheight + vpadding), max_h)
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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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ctx:set_source_rgba (.8, .8, .8, 1.0)
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ctx:move_to ((displaywidth - txtwidth) / 2, 1)
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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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