105 lines
2.9 KiB
Nim
105 lines
2.9 KiB
Nim
## A tilt EQ / filter LV2 plugin
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import nymph
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import paramsmooth
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import tiltfilter
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const
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PluginUri = "urn:nymph:examples:tiltfilter"
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minFreq = 20.0
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maxFreq = 20_000.0
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type
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SampleBuffer = UncheckedArray[cfloat]
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PluginPort {.pure.} = enum
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Input, Output, Frequency, Steepness, Mode
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TiltFilterPlugin = object
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input: ptr SampleBuffer
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output: ptr SampleBuffer
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freq: ptr cfloat
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steepness: ptr cfloat
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mode: ptr cfloat
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flt: TiltFilter
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smoothFreq: ParamSmooth
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proc instantiate(descriptor: ptr Lv2Descriptor; sampleRate: cdouble;
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bundlePath: cstring; features: ptr UncheckedArray[ptr Lv2Feature]):
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Lv2Handle {.cdecl.} =
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try:
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let plug = createShared(TiltFilterPlugin)
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plug.flt = initTiltFilter(10_000.0, 1.0, fmLowPass, sampleRate)
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plug.smoothFreq = initParamSmooth(20.0, sampleRate)
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return cast[Lv2Handle](plug)
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except OutOfMemDefect:
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return nil
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proc connectPort(instance: Lv2Handle; port: cuint;
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dataLocation: pointer) {.cdecl.} =
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let plug = cast[ptr TiltFilterPlugin](instance)
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case cast[PluginPort](port)
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of PluginPort.Input:
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plug.input = cast[ptr SampleBuffer](dataLocation)
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of PluginPort.Output:
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plug.output = cast[ptr SampleBuffer](dataLocation)
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of PluginPort.Frequency:
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plug.freq = cast[ptr cfloat](dataLocation)
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of PluginPort.Steepness:
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plug.steepness = cast[ptr cfloat](dataLocation)
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of PluginPort.Mode:
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plug.mode = cast[ptr cfloat](dataLocation)
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proc activate(instance: Lv2Handle) {.cdecl.} =
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let plug = cast[ptr TiltFilterPlugin](instance)
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plug.flt.reset()
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proc run(instance: Lv2Handle; nSamples: cuint) {.cdecl.} =
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let plug = cast[ptr TiltFilterPlugin](instance)
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let freq = plug.freq[].clamp(minFreq, maxFreq)
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plug.flt.setMode(plug.mode[].clamp(0.0, 2.0).FilterMode)
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plug.flt.setSteepness(plug.steepness[])
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for pos in 0 ..< nSamples:
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plug.flt.setCenterFreq(plug.smoothFreq.process(freq))
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plug.flt.update()
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plug.output[pos] = plug.flt.process(plug.input[pos])
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proc deactivate(instance: Lv2Handle) {.cdecl.} =
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discard
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proc cleanup(instance: Lv2Handle) {.cdecl.} =
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freeShared(cast[ptr TiltFilterPlugin](instance))
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proc extensionData(uri: cstring): pointer {.cdecl.} =
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return nil
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proc NimMain() {.cdecl, importc.}
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proc lv2Descriptor(index: cuint): ptr Lv2Descriptor {.
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cdecl, exportc, dynlib, extern: "lv2_descriptor".} =
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NimMain()
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if index == 0:
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result = createShared(Lv2Descriptor)
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result.uri = cstring(PluginUri)
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result.instantiate = instantiate
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result.connectPort = connectPort
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result.activate = activate
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result.run = run
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result.deactivate = deactivate
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result.cleanup = cleanup
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result.extensionData = extensionData
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