364 lines
11 KiB
Lua
364 lines
11 KiB
Lua
ardour {
|
|
["type"] = "dsp",
|
|
name = "ACE Inline Spectrogram",
|
|
category = "Visualization",
|
|
license = "MIT",
|
|
author = "Ardour Community",
|
|
description = [[Mixer strip inline spectrum display]]
|
|
}
|
|
|
|
-- return possible i/o configurations
|
|
function dsp_ioconfig ()
|
|
-- -1, -1 = any number of channels as long as input and output count matches
|
|
return { [1] = { audio_in = -1, audio_out = -1}, }
|
|
end
|
|
|
|
function dsp_params ()
|
|
return
|
|
{
|
|
{ ["type"] = "input", name = "Logscale", min = 0, max = 1, default = 0, toggled = true },
|
|
{ ["type"] = "input", name = "1/f scale", min = 0, max = 1, default = 1, toggled = true },
|
|
{ ["type"] = "input", name = "FFT Size", min = 0, max = 4, default = 3, enum = true, scalepoints =
|
|
{
|
|
["512"] = 0,
|
|
["1024"] = 1,
|
|
["2048"] = 2,
|
|
["4096"] = 3,
|
|
["8192"] = 4,
|
|
}
|
|
},
|
|
{ ["type"] = "input", name = "Height (Aspect)", min = 0, max = 3, default = 1, enum = true, scalepoints =
|
|
{
|
|
["Min"] = 0,
|
|
["16:10"] = 1,
|
|
["1:1"] = 2,
|
|
["Max"] = 3
|
|
}
|
|
},
|
|
{ ["type"] = "input", name = "Range", min = 20, max = 160, default = 60, unit="dB"},
|
|
{ ["type"] = "input", name = "Offset", min = -40, max = 40, default = 0, unit="dB"},
|
|
}
|
|
end
|
|
|
|
-- symbolic names for shmem offsets
|
|
local SHMEM_RATE = 0
|
|
local SHMEM_WRITEPTR = 1
|
|
local SHMEM_AUDIO = 2
|
|
|
|
-- a C memory area.
|
|
-- It needs to be in global scope.
|
|
-- When the variable is set to nil, the allocated memory is free()ed.
|
|
-- the memory can be interpreted as float* for use in DSP, or read/write
|
|
-- to a C++ Ringbuffer instance.
|
|
-- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:DSP:DspShm
|
|
local cmem = nil
|
|
|
|
function dsp_init (rate)
|
|
-- global variables (DSP part only)
|
|
dpy_hz = rate / 25
|
|
dpy_wr = 0
|
|
|
|
-- create a shared memory area to hold the sample rate, the write_pointer,
|
|
-- and (float) audio-data. Make it big enough to store 2s of audio which
|
|
-- should be enough. If not, the DSP will overwrite the oldest data anyway.
|
|
self:shmem ():allocate(2 + 2 * rate)
|
|
self:shmem ():clear()
|
|
self:shmem ():atomic_set_int (SHMEM_RATE, rate)
|
|
self:shmem ():atomic_set_int (SHMEM_WRITEPTR, 0)
|
|
|
|
-- allocate memory, local mix buffer
|
|
cmem = ARDOUR.DSP.DspShm (8192)
|
|
end
|
|
|
|
-- "dsp_runmap" uses Ardour's internal processor API, equivalent to
|
|
-- 'connect_and_run()". There is no overhead (mapping, translating buffers).
|
|
-- The lua implementation is responsible to map all the buffers directly.
|
|
function dsp_runmap (bufs, in_map, out_map, n_samples, offset)
|
|
-- here we sum all audio input channels and then copy the data to a
|
|
-- custom-made circular table for the GUIs to process later
|
|
|
|
local audio_ins = in_map:count (): n_audio () -- number of audio input buffers
|
|
local ccnt = 0 -- processed channel count
|
|
local mem = cmem:to_float(0) -- a "FloatArray", float* for direct C API usage from the previously allocated buffer
|
|
local rate = self:shmem ():atomic_get_int (SHMEM_RATE)
|
|
local write_ptr = self:shmem ():atomic_get_int (SHMEM_WRITEPTR)
|
|
|
|
local ringsize = 2 * rate
|
|
local ptr_wrap = math.floor(2^50 / ringsize) * ringsize
|
|
|
|
for c = 1,audio_ins do
|
|
-- see http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:ChanMapping
|
|
-- Note: lua starts counting at 1, ardour's ChanMapping::get() at 0
|
|
local ib = in_map:get (ARDOUR.DataType ("audio"), c - 1) -- get index of mapped input buffer
|
|
local ob = out_map:get (ARDOUR.DataType ("audio"), c - 1) -- get index of mapped output buffer
|
|
|
|
-- check if the input is connected to a buffer
|
|
if (ib ~= ARDOUR.ChanMapping.Invalid) then
|
|
|
|
-- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:AudioBuffer
|
|
-- http://manual.ardour.org/lua-scripting/class_reference/#ARDOUR:DSP
|
|
if c == 1 then
|
|
-- first channel, copy as-is
|
|
ARDOUR.DSP.copy_vector (mem, bufs:get_audio (ib):data (offset), n_samples)
|
|
else
|
|
-- all other channels, add to existing data.
|
|
ARDOUR.DSP.mix_buffers_no_gain (mem, bufs:get_audio (ib):data (offset), n_samples)
|
|
end
|
|
ccnt = ccnt + 1;
|
|
|
|
-- copy data to output (if not processing in-place)
|
|
if (ob ~= ARDOUR.ChanMapping.Invalid and ib ~= ob) then
|
|
ARDOUR.DSP.copy_vector (bufs:get_audio (ob):data (offset), bufs:get_audio (ib):data (offset), n_samples)
|
|
end
|
|
end
|
|
end
|
|
|
|
-- Clear unconnected output buffers.
|
|
-- In case we're processing in-place some buffers may be identical,
|
|
-- so this must be done *after processing*.
|
|
for c = 1,audio_ins do
|
|
local ib = in_map:get (ARDOUR.DataType ("audio"), c - 1)
|
|
local ob = out_map:get (ARDOUR.DataType ("audio"), c - 1)
|
|
if (ib == ARDOUR.ChanMapping.Invalid and ob ~= ARDOUR.ChanMapping.Invalid) then
|
|
bufs:get_audio (ob):silence (n_samples, offset)
|
|
end
|
|
end
|
|
|
|
-- Normalize gain (1 / channel-count)
|
|
if ccnt > 1 then
|
|
ARDOUR.DSP.apply_gain_to_buffer (mem, n_samples, 1 / ccnt)
|
|
end
|
|
|
|
-- if no channels were processed, feed silence.
|
|
if ccnt == 0 then
|
|
ARDOUR.DSP.memset (mem, 0, n_samples)
|
|
end
|
|
|
|
-- write data to the circular table
|
|
if (write_ptr % ringsize + n_samples < ringsize) then
|
|
ARDOUR.DSP.copy_vector (self:shmem ():to_float (SHMEM_AUDIO + write_ptr % ringsize), mem, n_samples)
|
|
else
|
|
local chunk = ringsize - write_ptr % ringsize
|
|
ARDOUR.DSP.copy_vector (self:shmem ():to_float (SHMEM_AUDIO + write_ptr % ringsize), mem, chunk)
|
|
ARDOUR.DSP.copy_vector (self:shmem ():to_float (SHMEM_AUDIO), cmem:to_float (chunk), n_samples - chunk)
|
|
end
|
|
self:shmem ():atomic_set_int (SHMEM_WRITEPTR, (write_ptr + n_samples) % ptr_wrap)
|
|
|
|
-- emit QueueDraw every FPS
|
|
-- TODO: call every FFT window-size worth of samples, at most every FPS
|
|
dpy_wr = dpy_wr + n_samples
|
|
if (dpy_wr > dpy_hz) then
|
|
dpy_wr = dpy_wr % dpy_hz
|
|
self:queue_draw ()
|
|
end
|
|
end
|
|
|
|
----------------------------------------------------------------
|
|
-- GUI
|
|
|
|
local fft = nil
|
|
local read_ptr = 0
|
|
local line = 0
|
|
local img = nil
|
|
local fft_size = 0
|
|
local last_log = false
|
|
|
|
|
|
function render_inline (ctx, w, max_h)
|
|
local ctrl = CtrlPorts:array () -- get control port array (read/write)
|
|
local rate = self:shmem ():atomic_get_int (SHMEM_RATE)
|
|
if not cmem then
|
|
cmem = ARDOUR.DSP.DspShm (0)
|
|
end
|
|
|
|
-- get settings
|
|
local logscale = ctrl[1] or 0; logscale = logscale > 0 -- x-axis logscale
|
|
local pink = ctrl[2] or 0; pink = pink > 0 -- 1/f scale
|
|
local fftsizeenum = ctrl[3] or 3 -- fft-size enum
|
|
local hmode = ctrl[4] or 1 -- height mode enum
|
|
local dbrange = ctrl[5] or 60
|
|
local gaindb = ctrl[6] or 0
|
|
|
|
local fftsize
|
|
if fftsizeenum == 0 then fftsize = 512
|
|
elseif fftsizeenum == 1 then fftsize = 1024
|
|
elseif fftsizeenum == 2 then fftsize = 2048
|
|
elseif fftsizeenum == 4 then fftsize = 8192
|
|
else fftsize = 4096
|
|
end
|
|
|
|
if fftsize ~= fft_size then
|
|
fft_size = fftsize
|
|
fft = nil
|
|
end
|
|
|
|
if dbrange < 20 then dbrange = 20; end
|
|
if dbrange > 160 then dbrange = 160; end
|
|
if gaindb < -40 then dbrange = -40; end
|
|
if gaindb > 40 then dbrange = 40; end
|
|
|
|
|
|
if not fft then
|
|
fft = ARDOUR.DSP.FFTSpectrum (fft_size, rate)
|
|
cmem:allocate (fft_size)
|
|
end
|
|
|
|
if last_log ~= logscale then
|
|
last_log = logscale
|
|
img = nil
|
|
line = 0
|
|
end
|
|
|
|
-- calc height
|
|
if hmode == 0 then
|
|
h = math.ceil (w * 10 / 16)
|
|
if (h > 44) then
|
|
h = 44
|
|
end
|
|
elseif (hmode == 2) then
|
|
h = w
|
|
elseif (hmode == 3) then
|
|
h = max_h
|
|
else
|
|
h = math.ceil (w * 10 / 16)
|
|
end
|
|
if (h > max_h) then
|
|
h = max_h
|
|
end
|
|
|
|
-- re-create image surface
|
|
if not img or img:get_width() ~= w or img:get_height () ~= h then
|
|
img = Cairo.ImageSurface (Cairo.Format.ARGB32, w, h)
|
|
line = 0
|
|
end
|
|
local ictx = img:context ()
|
|
|
|
local bins = fft_size / 2 - 1 -- fft bin count
|
|
local bpx = bins / w -- bins per x-pixel (linear)
|
|
local fpb = rate / fft_size -- freq-step per bin
|
|
local f_e = rate / 2 / fpb -- log-scale exponent
|
|
local f_b = w / math.log (fft_size / 2) -- inverse log-scale base
|
|
local f_l = math.log (fft_size / rate) * f_b -- inverse logscale lower-bound
|
|
|
|
local mem = cmem:to_float (0)
|
|
|
|
local ringsize = 2 * rate
|
|
local ptr_wrap = math.floor(2^50 / ringsize) * ringsize
|
|
|
|
local write_ptr
|
|
function read_space()
|
|
write_ptr = self:shmem ():atomic_get_int (SHMEM_WRITEPTR)
|
|
local space = (write_ptr - read_ptr + ptr_wrap) % ptr_wrap
|
|
if space > ringsize then
|
|
-- the GUI lagged too much and unread data was overwritten
|
|
-- jump to the oldest audio still present in the ringtable
|
|
read_ptr = write_ptr - ringsize
|
|
space = ringsize
|
|
end
|
|
return space
|
|
end
|
|
|
|
while (read_space() >= fft_size) do
|
|
-- read one window from the circular table
|
|
if (read_ptr % ringsize + fft_size < ringsize) then
|
|
ARDOUR.DSP.copy_vector (mem, self:shmem ():to_float (SHMEM_AUDIO + read_ptr % ringsize), fft_size)
|
|
else
|
|
local chunk = ringsize - read_ptr % ringsize
|
|
ARDOUR.DSP.copy_vector (mem, self:shmem ():to_float (SHMEM_AUDIO + read_ptr % ringsize), chunk)
|
|
ARDOUR.DSP.copy_vector (cmem:to_float(chunk), self:shmem ():to_float (SHMEM_AUDIO), fft_size - chunk)
|
|
end
|
|
read_ptr = (read_ptr + fft_size) % ptr_wrap
|
|
|
|
-- process one line
|
|
fft:set_data_hann (mem, fft_size, 0)
|
|
fft:execute ()
|
|
|
|
-- draw spectrum
|
|
assert (bpx >= 1)
|
|
|
|
-- scroll
|
|
if line == 0 then line = h - 1; else line = line - 1; end
|
|
|
|
-- clear this line
|
|
ictx:set_source_rgba (0, 0, 0, 1)
|
|
ictx:rectangle (0, line, w, 1)
|
|
ictx:fill ()
|
|
|
|
for x = 0, w - 1 do
|
|
local pk = 0
|
|
local b0, b1
|
|
if logscale then
|
|
-- 20 .. 20k
|
|
b0 = math.floor (f_e ^ (x / w))
|
|
b1 = math.floor (f_e ^ ((x + 1) / w))
|
|
else
|
|
b0 = math.floor (x * bpx)
|
|
b1 = math.floor ((x + 1) * bpx)
|
|
end
|
|
|
|
if b1 >= b0 and b1 <= bins and b0 >= 0 then
|
|
for i = b0, b1 do
|
|
local level = gaindb + fft:power_at_bin (i, pink and i or 1) -- pink ? i : 1
|
|
if level > -dbrange then
|
|
local p = (dbrange + level) / dbrange
|
|
if p > pk then pk = p; end
|
|
end
|
|
end
|
|
end
|
|
if pk > 0.0 then
|
|
if pk > 1.0 then pk = 1.0; end
|
|
ictx:set_source_rgba (ARDOUR.LuaAPI.hsla_to_rgba (.70 - .72 * pk, .9, .3 + pk * .4));
|
|
ictx:rectangle (x, line, 1, 1)
|
|
ictx:fill ()
|
|
end
|
|
end
|
|
end
|
|
|
|
-- copy image surface
|
|
if line == 0 then
|
|
img:set_as_source (ctx, 0, 0)
|
|
ctx:rectangle (0, 0, w, h)
|
|
ctx:fill ()
|
|
else
|
|
local yp = h - line - 1;
|
|
img:set_as_source (ctx, 0, yp)
|
|
ctx:rectangle (0, yp, w, line)
|
|
ctx:fill ()
|
|
|
|
img:set_as_source (ctx, 0, -line)
|
|
ctx:rectangle (0, 0, w, yp)
|
|
ctx:fill ()
|
|
end
|
|
|
|
|
|
-- draw grid on top
|
|
function x_at_freq (f)
|
|
if logscale then
|
|
return f_l + f_b * math.log (f)
|
|
else
|
|
return 2 * w * f / rate;
|
|
end
|
|
end
|
|
|
|
function grid_freq (f)
|
|
-- draw vertical grid line
|
|
local x = .5 + math.floor (x_at_freq (f))
|
|
ctx:move_to (x, 0)
|
|
ctx:line_to (x, h)
|
|
ctx:stroke ()
|
|
end
|
|
|
|
-- draw grid on top
|
|
local dash3 = C.DoubleVector ()
|
|
dash3:add ({1, 3})
|
|
ctx:set_line_width (1.0)
|
|
ctx:set_dash (dash3, 2) -- dotted line
|
|
ctx:set_source_rgba (.5, .5, .5, .8)
|
|
grid_freq (100)
|
|
grid_freq (1000)
|
|
grid_freq (10000)
|
|
ctx:unset_dash ()
|
|
|
|
return {w, h}
|
|
end
|