Rocky
31f5937a7f
Reduce extension memory pressure and delivery races while adding richer candidates, tactile feedback, and safer two-level creative polishing.
78 lines
3.1 KiB
Swift
78 lines
3.1 KiB
Swift
// ASRConversionTests.swift
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// OSGKeyboard · Tests
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//
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// Locks in the Float32→Int16 PCM conversion that `SpeechAnalyzerASR`
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// runs on the audio thread. The dictation transcriber's precondition
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// (`"Audio sample data must be 16-bit signed integers"`) trips if
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// the conversion is wrong, so the scaling + clipping math here is
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// the difference between "Speech works" and "Speech crashes" — worth
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// a regression test even though it's only ~3 lines of arithmetic.
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import XCTest
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@testable import OSGKeyboardShared
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@testable import OSGKeyboardHostSupport
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final class ASRConversionTests: XCTestCase {
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/// Edge cases: silence, full-scale positive, full-scale negative,
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/// mid-scale positive, mid-scale negative, and the "above unity"
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/// gain-overflow case. Each is the one number we'd most regret
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/// getting wrong.
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func testFloat32ToInt16EdgeCases() {
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runConversion(
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input: [0.0, 1.0, -1.0, 0.5, -0.5, 1.5, -1.5],
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expected: [0, 32767, -32767, 16384, -16384, 32767, -32768]
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)
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}
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/// Round-trip-ish: every Int16 in a small range should be
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/// reachable from a corresponding Float input. Locks the
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/// quantization step (1/32767) so a future "use a different
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/// scaling" change has to update this test.
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func testFloat32ToInt16RoundTrip() {
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var input = [Float]()
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var expected = [Int16]()
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for i in stride(from: -32768, through: 32767, by: 1024) {
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// Map Int16 back to its canonical Float source value:
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// src = i / 32767.0 (so src=1.0 → i=32767, src=-1.0 → i=-32767).
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// We don't test i=-32768 because the asymmetric range
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// (Int16 is -32768...32767) means there is no Float
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// that decodes back to exactly -32768.
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let src = Float(i) / 32767.0
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input.append(src)
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expected.append(Int16(i))
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}
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runConversion(input: input, expected: expected)
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}
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/// Empty input must be a no-op. Guards against off-by-one in
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/// the loop and against `UnsafePointer` access on a zero-length
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/// array (which is undefined behaviour in C but valid in Swift).
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func testFloat32ToInt16Empty() {
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// `sourceCount == 0` with `nil` pointers is a no-op. The
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// function guards on `sourceCount > 0` before dereferencing
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// anything, so the nil pointers are safe.
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ASRServiceFactory.convertFloat32ToInt16(
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source: nil, sourceCount: 0, destination: nil
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)
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// Reaching here without crashing is the assertion.
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}
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// MARK: - Helper
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private func runConversion(input: [Float], expected: [Int16]) {
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precondition(input.count == expected.count, "test setup")
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var actual = [Int16](repeating: 0, count: expected.count)
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input.withUnsafeBufferPointer { src in
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actual.withUnsafeMutableBufferPointer { dst in
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ASRServiceFactory.convertFloat32ToInt16(
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source: src.baseAddress,
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sourceCount: src.count,
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destination: dst.baseAddress
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)
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}
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}
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XCTAssertEqual(actual, expected)
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}
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}
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