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Add ambient sound playback for focus sessions #88

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216 changes: 216 additions & 0 deletions freewrite/AmbientSoundManager.swift
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Original file line number Diff line number Diff line change
@@ -0,0 +1,216 @@
// Swift 5.0
//
// AmbientSoundManager.swift
// freewrite
//
// Procedurally generated ambient sounds for focus sessions.
// Uses AVAudioEngine with AVAudioSourceNode to synthesize
// noise patterns — no bundled audio files required.
//

import AVFoundation

enum AmbientSound: String, CaseIterable, Identifiable {
case whiteNoise = "White Noise"
case rain = "Rain"
case ocean = "Ocean"
case fireplace = "Fireplace"
case wind = "Wind"

var id: String { rawValue }

var icon: String {
switch self {
case .whiteNoise: return "waveform"
case .rain: return "cloud.rain"
case .ocean: return "water.waves"
case .fireplace: return "flame"
case .wind: return "wind"
}
}
}

class AmbientSoundManager: ObservableObject {
@Published var currentSound: AmbientSound?
@Published var isPlaying = false

private var audioEngine: AVAudioEngine?
private var sourceNode: AVAudioSourceNode?

// State for noise generation
private var brownNoiseState: Float = 0
private var rainDropTimer: Float = 0
private var crackleTimer: Float = 0
private var gustPhase: Float = 0

func play(_ sound: AmbientSound) {
stop()
currentSound = sound
isPlaying = true

// Reset generator state
brownNoiseState = 0
rainDropTimer = 0
crackleTimer = 0
gustPhase = 0

let engine = AVAudioEngine()
let format = AVAudioFormat(standardFormatWithSampleRate: 44100, channels: 1)!

let generator = createGenerator(for: sound)
let source = AVAudioSourceNode(format: format) { _, _, frameCount, bufferList -> OSStatus in
let buffer = UnsafeMutableBufferPointer<Float>(
start: bufferList.pointee.mBuffers.mData?.assumingMemoryBound(to: Float.self),
count: Int(frameCount)
)
for i in 0..<Int(frameCount) {
buffer[i] = generator(i)
}
return noErr
}

engine.attach(source)
engine.connect(source, to: engine.mainMixerNode, format: format)
engine.mainMixerNode.outputVolume = 0.3

do {
try engine.start()
audioEngine = engine
sourceNode = source
} catch {
print("Error starting ambient sound: \(error)")
isPlaying = false
currentSound = nil
}
}

func stop() {
audioEngine?.stop()
if let source = sourceNode {
audioEngine?.detach(source)
}
audioEngine = nil
sourceNode = nil
isPlaying = false
currentSound = nil
}

func toggle(_ sound: AmbientSound) {
if currentSound == sound && isPlaying {
stop()
} else {
play(sound)
}
}

// MARK: - Noise Generators

private func createGenerator(for sound: AmbientSound) -> (Int) -> Float {
switch sound {
case .whiteNoise:
return whiteNoiseGenerator()
case .rain:
return rainGenerator()
case .ocean:
return oceanGenerator()
case .fireplace:
return fireplaceGenerator()
case .wind:
return windGenerator()
}
}

/// Pure white noise — equal energy across all frequencies.
private func whiteNoiseGenerator() -> (Int) -> Float {
return { _ in
Float.random(in: -0.4...0.4)
}
}

/// Rain — layered filtered noise with random drop accents.
private func rainGenerator() -> (Int) -> Float {
var lowPassState: Float = 0
var dropAccent: Float = 0

return { _ in
// Base: low-passed white noise for steady rain
let white = Float.random(in: -1...1)
let alpha: Float = 0.15
lowPassState = alpha * white + (1 - alpha) * lowPassState
let base = lowPassState * 0.6

// Random drop accents
dropAccent *= 0.9992
if Float.random(in: 0...1) < 0.0003 {
dropAccent = Float.random(in: 0.3...0.7)
}
let drop = Float.random(in: -1...1) * dropAccent * 0.4

return base + drop
}
}

/// Ocean waves — slow amplitude modulation on brown noise.
private func oceanGenerator() -> (Int) -> Float {
var brownState: Float = 0
var phase: Float = 0
let sampleRate: Float = 44100

return { _ in
// Brown noise base
brownState += Float.random(in: -0.02...0.02)
brownState = max(-1, min(1, brownState)) * 0.98

// Slow wave envelope (~8 second cycle)
phase += 1.0 / sampleRate
let wave = (sin(phase * 2 * .pi / 8.0) + 1) / 2
let envelope = 0.2 + wave * 0.5

return brownState * envelope
}
}

/// Fireplace — crackle bursts layered on warm low rumble.
private func fireplaceGenerator() -> (Int) -> Float {
var lowState: Float = 0
var crackle: Float = 0

return { _ in
// Warm low rumble
let white = Float.random(in: -1...1)
let alpha: Float = 0.05
lowState = alpha * white + (1 - alpha) * lowState
let rumble = lowState * 0.5

// Random crackle pops
crackle *= 0.996
if Float.random(in: 0...1) < 0.0002 {
crackle = Float.random(in: 0.4...0.9)
}
let pop = Float.random(in: -1...1) * crackle * 0.5

return rumble + pop
}
}

/// Wind — modulated filtered noise with slow gusts.
private func windGenerator() -> (Int) -> Float {
var filterState: Float = 0
var phase: Float = 0
let sampleRate: Float = 44100

return { _ in
let white = Float.random(in: -1...1)

// Varying filter cutoff for gusts (~12 second cycle)
phase += 1.0 / sampleRate
let gust = (sin(phase * 2 * .pi / 12.0) + 1) / 2
let alpha = 0.05 + gust * 0.2

filterState = alpha * white + (1 - alpha) * filterState
let envelope = 0.3 + gust * 0.4

return filterState * envelope
}
}
}
81 changes: 81 additions & 0 deletions freewrite/ContentView.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -129,6 +129,9 @@ struct ContentView: View {
@State private var selectedVideoHasTranscript = false
@State private var backspaceDisabled = false // Add state for backspace toggle
@State private var isHoveringBackspaceToggle = false // Add state for backspace toggle hover
@State private var showingAmbientMenu = false
@State private var isHoveringAmbientButton = false
@StateObject private var ambientSoundManager = AmbientSoundManager()
@State private var showingVideoRecording = false // Add state for video recording view
@State private var isHoveringVideoButton = false // Add state for video button hover
@State private var currentVideoURL: URL? = nil // Add state for current video being viewed
Expand Down Expand Up @@ -754,6 +757,11 @@ struct ContentView: View {
isPreparingVideoRecording = false
showingVideoRecording = true
}

// Pause ambient sound during video recording
if ambientSoundManager.isPlaying {
ambientSoundManager.stop()
}
}

if presentationDelay > 0 {
Expand Down Expand Up @@ -1147,6 +1155,79 @@ struct ContentView: View {
}
}

Text("•")
.foregroundColor(.gray)

// Ambient sound button
Button(action: {
showingAmbientMenu.toggle()
}) {
Image(systemName: ambientSoundManager.isPlaying ? "speaker.wave.2.fill" : "speaker.wave.2")
.foregroundColor(ambientSoundManager.isPlaying ? (colorScheme == .light ? .black : .white) : (isHoveringAmbientButton ? textHoverColor : textColor))
.frame(width: 14, height: 14)
}
.buttonStyle(.plain)
.onHover { hovering in
isHoveringAmbientButton = hovering
isHoveringBottomNav = hovering
if hovering {
NSCursor.pointingHand.push()
} else {
NSCursor.pop()
}
}
.popover(isPresented: $showingAmbientMenu, arrowEdge: .top) {
VStack(alignment: .leading, spacing: 0) {
ForEach(AmbientSound.allCases) { sound in
Button(action: {
ambientSoundManager.toggle(sound)
}) {
HStack(spacing: 8) {
Image(systemName: sound.icon)
.frame(width: 16)
.foregroundColor(ambientSoundManager.currentSound == sound ? .accentColor : popoverTextColor)
Text(sound.rawValue)
.foregroundColor(ambientSoundManager.currentSound == sound ? .accentColor : popoverTextColor)
Spacer()
if ambientSoundManager.currentSound == sound {
Image(systemName: "checkmark")
.font(.system(size: 10, weight: .bold))
.foregroundColor(.accentColor)
}
}
.padding(.horizontal, 12)
.padding(.vertical, 8)
.contentShape(Rectangle())
}
.buttonStyle(.plain)
if sound != AmbientSound.allCases.last {
Divider()
}
}
if ambientSoundManager.isPlaying {
Divider()
Button(action: {
ambientSoundManager.stop()
showingAmbientMenu = false
}) {
HStack(spacing: 8) {
Image(systemName: "stop.fill")
.frame(width: 16)
.foregroundColor(popoverTextColor)
Text("Stop")
.foregroundColor(popoverTextColor)
}
.padding(.horizontal, 12)
.padding(.vertical, 8)
.contentShape(Rectangle())
}
.buttonStyle(.plain)
}
}
.padding(.vertical, 4)
.frame(width: 160)
}

Text("•")
.foregroundColor(.gray)

Expand Down