33 lines
1.7 KiB
Swift
33 lines
1.7 KiB
Swift
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extension Sound.Synth {
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/// Custom generator callbacks. Samples are in signed Q8.24 format.
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public struct Generator {
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/// Renders up to 256 sample frames into `left` (and `right` for
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/// stereo generators). `rate` is the per-frame phase step in
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/// Q0.32 format and `drate` its per-frame change. Returns the
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/// number of frames rendered.
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public var render: (_ left: UnsafeMutableBufferPointer<Int32>,
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_ right: UnsafeMutableBufferPointer<Int32>?,
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_ rate: UInt32, _ drate: Int32) -> Int
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/// Called when a note starts. `length` is -1 for indefinite notes.
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public var noteOn: ((_ note: Sound.MIDINote, _ velocity: Float, _ length: Float) -> Void)?
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/// Called when a note is released (`stop == false`) or stopped
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/// (`stop == true`).
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public var release: ((_ stop: Bool) -> Void)?
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/// Sets a generator parameter. Returns `true` if the parameter is
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/// valid.
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public var setParameter: ((_ parameter: Int, _ value: Float) -> Bool)?
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public init(render: @escaping (_ left: UnsafeMutableBufferPointer<Int32>,
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_ right: UnsafeMutableBufferPointer<Int32>?,
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_ rate: UInt32, _ drate: Int32) -> Int,
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noteOn: ((_ note: Sound.MIDINote, _ velocity: Float, _ length: Float) -> Void)? = nil,
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release: ((_ stop: Bool) -> Void)? = nil,
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setParameter: ((_ parameter: Int, _ value: Float) -> Bool)? = nil) {
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self.render = render
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self.noteOn = noteOn
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self.release = release
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self.setParameter = setParameter
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}
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}
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}
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