examples : add whisper.swiftui demo app (#308)

* Add SwiftUI demo project.

* Add -DGGML_USE_ACCELERATE
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A sample SwiftUI app using [whisper.cpp](https://github.com/ggerganov/whisper.cpp/) to do voice-to-text transcriptions.
See also: [whisper.objc](https://github.com/ggerganov/whisper.cpp/tree/master/examples/whisper.objc).
To use:
1. Select a model from the [whisper.cpp repository](https://github.com/ggerganov/whisper.cpp/tree/master/models).[^1]
2. Add the model to "whisper.swiftui.demo/Resources/models" via Xcode.
3. Select a sample audio file (for example, [jfk.wav](https://github.com/ggerganov/whisper.cpp/raw/master/samples/jfk.wav)).
4. Add the model to "whisper.swiftui.demo/Resources/samples" via Xcode.
5. Select the "release" build configuration under "Run", then deploy and run to your device.
[^1]: I recommend the tiny, base or small models for running on an iOS device.

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import Foundation
enum WhisperError: Error {
case couldNotInitializeContext
}
// Meet Whisper C++ constraint: Don't access from more than one thread at a time.
actor WhisperContext {
private var context: OpaquePointer
init(context: OpaquePointer) {
self.context = context
}
deinit {
whisper_free(context)
}
func fullTranscribe(samples: [Float]) {
// Leave 2 processors free (i.e. the high-efficiency cores).
let maxThreads = max(1, min(8, cpuCount() - 2))
print("Selecting \(maxThreads) threads")
var params = whisper_full_default_params(WHISPER_SAMPLING_GREEDY)
"en".withCString { en in
// Adapted from whisper.objc
params.print_realtime = true
params.print_progress = false
params.print_timestamps = true
params.print_special = false
params.translate = false
params.language = en
params.n_threads = Int32(maxThreads)
params.offset_ms = 0
params.no_context = true
params.single_segment = false
whisper_reset_timings(context)
print("About to run whisper_full")
samples.withUnsafeBufferPointer { samples in
if (whisper_full(context, params, samples.baseAddress, Int32(samples.count)) != 0) {
print("Failed to run the model")
} else {
whisper_print_timings(context)
}
}
}
}
func getTranscription() -> String {
var transcription = ""
for i in 0..<whisper_full_n_segments(context) {
transcription += String.init(cString: whisper_full_get_segment_text(context, i))
}
return transcription
}
static func createContext(path: String) throws -> WhisperContext {
let context = whisper_init(path)
if let context {
return WhisperContext(context: context)
} else {
print("Couldn't load model at \(path)")
throw WhisperError.couldNotInitializeContext
}
}
}
fileprivate func cpuCount() -> Int {
ProcessInfo.processInfo.processorCount
}

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//
// Use this file to import your target's public headers that you would like to expose to Swift.
//
#import "whisper.h"

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import Foundation
import SwiftUI
import AVFoundation
@MainActor
class WhisperState: NSObject, ObservableObject, AVAudioRecorderDelegate {
@Published var isModelLoaded = false
@Published var messageLog = ""
@Published var canTranscribe = false
@Published var isRecording = false
private var whisperContext: WhisperContext?
private let recorder = Recorder()
private var recordedFile: URL? = nil
private var audioPlayer: AVAudioPlayer?
private var modelUrl: URL? {
Bundle.main.url(forResource: "ggml-tiny.en", withExtension: "bin", subdirectory: "models")
}
private var sampleUrl: URL? {
Bundle.main.url(forResource: "jfk", withExtension: "wav", subdirectory: "samples")
}
private enum LoadError: Error {
case couldNotLocateModel
}
override init() {
super.init()
do {
try loadModel()
canTranscribe = true
} catch {
print(error.localizedDescription)
messageLog += "\(error.localizedDescription)\n"
}
}
private func loadModel() throws {
messageLog += "Loading model...\n"
if let modelUrl {
whisperContext = try WhisperContext.createContext(path: modelUrl.path())
messageLog += "Loaded model \(modelUrl.lastPathComponent)\n"
} else {
messageLog += "Could not locate model\n"
}
}
func transcribeSample() async {
if let sampleUrl {
await transcribeAudio(sampleUrl)
} else {
messageLog += "Could not locate sample\n"
}
}
private func transcribeAudio(_ url: URL) async {
if (!canTranscribe) {
return
}
guard let whisperContext else {
return
}
do {
canTranscribe = false
messageLog += "Reading wave samples...\n"
let data = try readAudioSamples(url)
messageLog += "Transcribing data...\n"
await whisperContext.fullTranscribe(samples: data)
let text = await whisperContext.getTranscription()
messageLog += "Done: \(text)\n"
} catch {
print(error.localizedDescription)
messageLog += "\(error.localizedDescription)\n"
}
canTranscribe = true
}
private func readAudioSamples(_ url: URL) throws -> [Float] {
stopPlayback()
try startPlayback(url)
return try decodeWaveFile(url)
}
func toggleRecord() async {
if isRecording {
await recorder.stopRecording()
isRecording = false
if let recordedFile {
await transcribeAudio(recordedFile)
}
} else {
requestRecordPermission { granted in
if granted {
Task {
do {
self.stopPlayback()
let file = try FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
.appending(path: "output.wav")
try await self.recorder.startRecording(toOutputFile: file, delegate: self)
self.isRecording = true
self.recordedFile = file
} catch {
print(error.localizedDescription)
self.messageLog += "\(error.localizedDescription)\n"
self.isRecording = false
}
}
}
}
}
}
private func requestRecordPermission(response: @escaping (Bool) -> Void) {
#if os(macOS)
response(true)
#else
AVAudioSession.sharedInstance().requestRecordPermission { granted in
response(granted)
}
#endif
}
private func startPlayback(_ url: URL) throws {
audioPlayer = try AVAudioPlayer(contentsOf: url)
audioPlayer?.play()
}
private func stopPlayback() {
audioPlayer?.stop()
audioPlayer = nil
}
// MARK: AVAudioRecorderDelegate
nonisolated func audioRecorderEncodeErrorDidOccur(_ recorder: AVAudioRecorder, error: Error?) {
if let error {
Task {
await handleRecError(error)
}
}
}
private func handleRecError(_ error: Error) {
print(error.localizedDescription)
messageLog += "\(error.localizedDescription)\n"
isRecording = false
}
nonisolated func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) {
Task {
await onDidFinishRecording()
}
}
private func onDidFinishRecording() {
isRecording = false
}
}

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{
"colors" : [
{
"idiom" : "universal"
}
],
"info" : {
"author" : "xcode",
"version" : 1
}
}

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{
"images" : [
{
"idiom" : "universal",
"platform" : "ios",
"size" : "1024x1024"
},
{
"idiom" : "mac",
"scale" : "1x",
"size" : "16x16"
},
{
"idiom" : "mac",
"scale" : "2x",
"size" : "16x16"
},
{
"idiom" : "mac",
"scale" : "1x",
"size" : "32x32"
},
{
"idiom" : "mac",
"scale" : "2x",
"size" : "32x32"
},
{
"idiom" : "mac",
"scale" : "1x",
"size" : "128x128"
},
{
"idiom" : "mac",
"scale" : "2x",
"size" : "128x128"
},
{
"idiom" : "mac",
"scale" : "1x",
"size" : "256x256"
},
{
"idiom" : "mac",
"scale" : "2x",
"size" : "256x256"
},
{
"idiom" : "mac",
"scale" : "1x",
"size" : "512x512"
},
{
"idiom" : "mac",
"scale" : "2x",
"size" : "512x512"
}
],
"info" : {
"author" : "xcode",
"version" : 1
}
}

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{
"info" : {
"author" : "xcode",
"version" : 1
}
}

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{
"info" : {
"author" : "xcode",
"version" : 1
}
}

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>com.apple.security.app-sandbox</key>
<true/>
<key>com.apple.security.device.audio-input</key>
<true/>
<key>com.apple.security.files.user-selected.read-only</key>
<true/>
</dict>
</plist>

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import SwiftUI
import AVFoundation
struct ContentView: View {
@StateObject var whisperState = WhisperState()
var body: some View {
NavigationStack {
VStack {
HStack {
Button("Transcribe", action: {
Task {
await whisperState.transcribeSample()
}
})
.buttonStyle(.bordered)
.disabled(!whisperState.canTranscribe)
Button(whisperState.isRecording ? "Stop recording" : "Start recording", action: {
Task {
await whisperState.toggleRecord()
}
})
.buttonStyle(.bordered)
.disabled(!whisperState.canTranscribe)
}
ScrollView {
Text(verbatim: whisperState.messageLog)
.frame(maxWidth: .infinity, alignment: .leading)
}
}
.navigationTitle("Whisper SwiftUI Demo")
.padding()
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}

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import Foundation
import AVFoundation
actor Recorder {
private var recorder: AVAudioRecorder?
enum RecorderError: Error {
case couldNotStartRecording
}
func startRecording(toOutputFile url: URL, delegate: AVAudioRecorderDelegate?) throws {
let recordSettings: [String : Any] = [
AVFormatIDKey: Int(kAudioFormatLinearPCM),
AVSampleRateKey: 16000.0,
AVNumberOfChannelsKey: 1,
AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
]
#if !os(macOS)
let session = AVAudioSession.sharedInstance()
try session.setCategory(.playAndRecord, mode: .default)
#endif
let recorder = try AVAudioRecorder(url: url, settings: recordSettings)
recorder.delegate = delegate
if recorder.record() == false {
print("Could not start recording")
throw RecorderError.couldNotStartRecording
}
self.recorder = recorder
}
func stopRecording() {
recorder?.stop()
recorder = nil
}
}

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import Foundation
func decodeWaveFile(_ url: URL) throws -> [Float] {
let data = try Data(contentsOf: url)
let floats = stride(from: 44, to: data.count, by: 2).map {
return data[$0..<$0 + 2].withUnsafeBytes {
let short = Int16(littleEndian: $0.load(as: Int16.self))
return max(-1.0, min(Float(short) / 32767.0, 1.0))
}
}
return floats
}

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import SwiftUI
@main
struct WhisperCppDemoApp: App {
var body: some Scene {
WindowGroup {
ContentView()
}
}
}

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