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