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Audio processing examples #22

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Audio processing examples #22

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573c578
audio processor demo
hiroshihorie Aug 14, 2023
4065900
update
hiroshihorie Aug 15, 2023
b541fe8
update delegate
hiroshihorie Aug 16, 2023
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18 changes: 9 additions & 9 deletions LiveKitExample-dev.xcworkspace/xcshareddata/swiftpm/Package.resolved
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Original file line number Diff line number Diff line change
Expand Up @@ -15,8 +15,8 @@
"repositoryURL": "https://github.com/google/promises.git",
"state": {
"branch": null,
"revision": "ec957ccddbcc710ccc64c9dcbd4c7006fcf8b73a",
"version": "2.2.0"
"revision": "e70e889c0196c76d22759eb50d6a0270ca9f1d9e",
"version": "2.3.1"
}
},
{
Expand All @@ -32,27 +32,27 @@
"package": "WebRTC",
"repositoryURL": "https://github.com/webrtc-sdk/Specs.git",
"state": {
"branch": null,
"revision": "2f6bab30c8df0fe59ab3e58bc99097f757f85f65",
"version": "104.5112.17"
"branch": "audio-processing",
"revision": "e92a92cfdaec60c1b89bb94969d8009507a107ae",
"version": null
}
},
{
"package": "swift-log",
"repositoryURL": "https://github.com/apple/swift-log.git",
"state": {
"branch": null,
"revision": "32e8d724467f8fe623624570367e3d50c5638e46",
"version": "1.5.2"
"revision": "532d8b529501fb73a2455b179e0bbb6d49b652ed",
"version": "1.5.3"
}
},
{
"package": "SwiftProtobuf",
"repositoryURL": "https://github.com/apple/swift-protobuf.git",
"state": {
"branch": null,
"revision": "0af9125c4eae12a4973fb66574c53a54962a9e1e",
"version": "1.21.0"
"revision": "ce20dc083ee485524b802669890291c0d8090170",
"version": "1.22.1"
}
}
]
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22 changes: 18 additions & 4 deletions LiveKitExample.xcodeproj/project.pbxproj
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,8 @@
68B3854C271E780700711D5F /* LiveKitExample.swift in Sources */ = {isa = PBXBuildFile; fileRef = 68B3853C271E780600711D5F /* LiveKitExample.swift */; };
68B3854D271E780700711D5F /* LiveKitExample.swift in Sources */ = {isa = PBXBuildFile; fileRef = 68B3853C271E780600711D5F /* LiveKitExample.swift */; };
68EA18E827F2E91000F9AE48 /* BroadcastExt.appex in Embed Foundation Extensions */ = {isa = PBXBuildFile; fileRef = 683F05F3273F96B20080C7AC /* BroadcastExt.appex */; settings = {ATTRIBUTES = (RemoveHeadersOnCopy, ); }; };
68FC569C2A8AB369004B4989 /* SimpleReverbAudioCapturePostProcessor.swift in Sources */ = {isa = PBXBuildFile; fileRef = 68FC569B2A8AB369004B4989 /* SimpleReverbAudioCapturePostProcessor.swift */; };
68FC569D2A8AB586004B4989 /* SimpleReverbAudioCapturePostProcessor.swift in Sources */ = {isa = PBXBuildFile; fileRef = 68FC569B2A8AB369004B4989 /* SimpleReverbAudioCapturePostProcessor.swift */; };
D7AA477B285A0FFC00EB41AE /* SampleHandler.swift in Sources */ = {isa = PBXBuildFile; fileRef = D7AA477A285A0FFC00EB41AE /* SampleHandler.swift */; };
D7FECD462860B42700D04D1C /* LoggingOSLog.swift in Sources */ = {isa = PBXBuildFile; fileRef = D7FECD452860B42700D04D1C /* LoggingOSLog.swift */; };
/* End PBXBuildFile section */
Expand Down Expand Up @@ -96,6 +98,7 @@
68B38549271E780700711D5F /* LiveKitExample.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = LiveKitExample.app; sourceTree = BUILT_PRODUCTS_DIR; };
68B3854B271E780700711D5F /* macOS.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = macOS.entitlements; sourceTree = "<group>"; };
68DEF27E2919EEFA00258494 /* ReplayKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = ReplayKit.framework; path = Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS16.1.sdk/System/Library/Frameworks/ReplayKit.framework; sourceTree = DEVELOPER_DIR; };
68FC569B2A8AB369004B4989 /* SimpleReverbAudioCapturePostProcessor.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SimpleReverbAudioCapturePostProcessor.swift; sourceTree = "<group>"; };
9E7835E62751A71500559DEC /* CoreGraphics.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = CoreGraphics.framework; path = Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS15.0.sdk/System/Library/Frameworks/CoreGraphics.framework; sourceTree = DEVELOPER_DIR; };
D7AA477A285A0FFC00EB41AE /* SampleHandler.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SampleHandler.swift; sourceTree = "<group>"; };
D7FECD452860B42700D04D1C /* LoggingOSLog.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LoggingOSLog.swift; sourceTree = "<group>"; };
Expand Down Expand Up @@ -207,6 +210,7 @@
68B3853B271E780600711D5F /* Shared */ = {
isa = PBXGroup;
children = (
68FC569A2A8AB35D004B4989 /* AudioProcessors */,
683720D427A0640D007DA986 /* Support */,
6884B77A2750505B00732D47 /* Views */,
685271EA27443907006B4D6A /* Controllers */,
Expand Down Expand Up @@ -240,6 +244,14 @@
path = macOS;
sourceTree = "<group>";
};
68FC569A2A8AB35D004B4989 /* AudioProcessors */ = {
isa = PBXGroup;
children = (
68FC569B2A8AB369004B4989 /* SimpleReverbAudioCapturePostProcessor.swift */,
);
path = AudioProcessors;
sourceTree = "<group>";
};
/* End PBXGroup section */

/* Begin PBXNativeTarget section */
Expand Down Expand Up @@ -402,6 +414,7 @@
683720D227A06404007DA986 /* ConnectionHistory.swift in Sources */,
681E3F43271FC7AD007BB547 /* RoomView.swift in Sources */,
6816B1B0272D9198005ADB85 /* ParticipantView.swift in Sources */,
68FC569C2A8AB369004B4989 /* SimpleReverbAudioCapturePostProcessor.swift in Sources */,
68816CC527B4DCD500E24622 /* SecureStore.swift in Sources */,
68B3854C271E780700711D5F /* LiveKitExample.swift in Sources */,
681E3F3F271FC795007BB547 /* Custom.swift in Sources */,
Expand All @@ -421,6 +434,7 @@
683720D327A06404007DA986 /* ConnectionHistory.swift in Sources */,
681E3F44271FC7AD007BB547 /* RoomView.swift in Sources */,
6816B1B1272D9198005ADB85 /* ParticipantView.swift in Sources */,
68FC569D2A8AB586004B4989 /* SimpleReverbAudioCapturePostProcessor.swift in Sources */,
68816CC627B4DCD500E24622 /* SecureStore.swift in Sources */,
68B3854D271E780700711D5F /* LiveKitExample.swift in Sources */,
681E3F40271FC795007BB547 /* Custom.swift in Sources */,
Expand Down Expand Up @@ -619,7 +633,7 @@
CODE_SIGN_ENTITLEMENTS = "$(SRCROOT)/iOS/iOS.entitlements";
CODE_SIGN_IDENTITY = "Apple Development";
CODE_SIGN_STYLE = Automatic;
CURRENT_PROJECT_VERSION = 27;
CURRENT_PROJECT_VERSION = 28;
DEVELOPMENT_TEAM = 76TVFCUKK7;
ENABLE_PREVIEWS = YES;
INFOPLIST_FILE = iOS/Info.plist;
Expand All @@ -634,7 +648,7 @@
"$(inherited)",
"@executable_path/Frameworks",
);
MARKETING_VERSION = 1.0.27;
MARKETING_VERSION = 1.0.28;
PRODUCT_BUNDLE_IDENTIFIER = io.livekit.example.SwiftSDK.1;
PRODUCT_NAME = LiveKitExample;
PROVISIONING_PROFILE_SPECIFIER = "";
Expand All @@ -653,7 +667,7 @@
CODE_SIGN_ENTITLEMENTS = "$(SRCROOT)/iOS/iOS.entitlements";
CODE_SIGN_IDENTITY = "Apple Development";
CODE_SIGN_STYLE = Automatic;
CURRENT_PROJECT_VERSION = 27;
CURRENT_PROJECT_VERSION = 28;
DEVELOPMENT_TEAM = 76TVFCUKK7;
ENABLE_PREVIEWS = YES;
INFOPLIST_FILE = iOS/Info.plist;
Expand All @@ -668,7 +682,7 @@
"$(inherited)",
"@executable_path/Frameworks",
);
MARKETING_VERSION = 1.0.27;
MARKETING_VERSION = 1.0.28;
PRODUCT_BUNDLE_IDENTIFIER = io.livekit.example.SwiftSDK.1;
PRODUCT_NAME = LiveKitExample;
PROVISIONING_PROFILE_SPECIFIER = "";
Expand Down
47 changes: 47 additions & 0 deletions Shared/AudioProcessors/SimpleReverbAudioCapturePostProcessor.swift
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Original file line number Diff line number Diff line change
@@ -0,0 +1,47 @@
import Foundation
import LiveKit
import WebRTC

class SimpleReverbAudioCapturePostProcessor: NSObject, RTCAudioCustomProcessingDelegate {

private var delayBuffer: [Float] = []
private let delayBufferSize: Int = 4410 // 0.1 second at 44.1kHz
private var delayBufferIndex: Int = 0
private let feedback: Float = 0.6

func audioProcessingInitialize(sampleRate sampleRateHz: Int, channels: Int) {
print("\(String(describing: self)) initialize(sampleRateHz: \(sampleRateHz), channels: \(channels))")
delayBuffer = Array(repeating: 0.0, count: delayBufferSize)
}

func audioProcessingProcess(audioBuffer: RTCAudioBuffer) {

// print("\(String(describing: self)) process(audioBuffer: \(audioBuffer))")

for channelIndex in 0..<audioBuffer.channels {
let channelBuffer = audioBuffer.rawBuffer(forChannel: channelIndex)

for frameIndex in 0..<audioBuffer.frames {
let inputSample = channelBuffer[frameIndex]
let delayedSample = delayBuffer[delayBufferIndex]

// Mix the current sample with the delayed sample
let outputSample = inputSample + delayedSample * feedback

// Store the output sample into the delay buffer
delayBuffer[delayBufferIndex] = outputSample

// Write the output sample back to the channel buffer
channelBuffer[frameIndex] = outputSample

// Increment and wrap the delay buffer index
delayBufferIndex = (delayBufferIndex + 1) % delayBufferSize
}
}
}

func audioProcessingRelease() {
print("\(String(describing: self)) destroy()")
delayBuffer.removeAll()
}
}
34 changes: 13 additions & 21 deletions Shared/Controllers/AppContext.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@ extension ObservableObject where Self.ObjectWillChangePublisher == ObservableObj
final class AppContext: ObservableObject {

private let store: ValueStore<Preferences>
private let simpleReverbAudioCapturePostProcessor = SimpleReverbAudioCapturePostProcessor()

@Published var videoViewVisible: Bool = true {
didSet { store.value.videoViewVisible = videoViewVisible }
Expand All @@ -38,30 +39,30 @@ final class AppContext: ObservableObject {
didSet { store.value.connectionHistory = connectionHistory }
}

@Published var outputDevice: RTCAudioDevice = RTCAudioDevice.defaultDevice(with: .output) {
@Published var outputDevice: RTCIODevice = RTCIODevice.defaultDevice(with: .output) {
didSet {
print("didSet outputDevice: \(String(describing: outputDevice))")

if !Room.audioDeviceModule.setOutputDevice(outputDevice) {
print("failed to set value")
}
Room.audioDeviceModule.outputDevice = outputDevice
}
}

@Published var inputDevice: RTCAudioDevice = RTCAudioDevice.defaultDevice(with: .input) {
@Published var inputDevice: RTCIODevice = RTCIODevice.defaultDevice(with: .input) {
didSet {
print("didSet inputDevice: \(String(describing: inputDevice))")

if !Room.audioDeviceModule.setInputDevice(inputDevice) {
print("failed to set value")
}
Room.audioDeviceModule.inputDevice = inputDevice
}
}

@Published var preferSpeakerOutput: Bool = true {
didSet { AudioManager.shared.preferSpeakerOutput = preferSpeakerOutput }
}

@Published var sampleCapturePostProcessingEnabled: Bool = false {
didSet {
Room.audioProcessingModule.capturePostProcessingDelegate = sampleCapturePostProcessingEnabled ? simpleReverbAudioCapturePostProcessor : nil
}
}

public init(store: ValueStore<Preferences>) {
self.store = store

Expand All @@ -76,17 +77,8 @@ final class AppContext: ObservableObject {
print("devices did update")
// force UI update for outputDevice / inputDevice
DispatchQueue.main.async {

// set to default device if selected device is removed
if !Room.audioDeviceModule.outputDevices.contains(where: { self.outputDevice == $0 }) {
self.outputDevice = RTCAudioDevice.defaultDevice(with: .output)
}

// set to default device if selected device is removed
if !Room.audioDeviceModule.inputDevices.contains(where: { self.inputDevice == $0 }) {
self.inputDevice = RTCAudioDevice.defaultDevice(with: .input)
}

self.outputDevice = Room.audioDeviceModule.outputDevice
self.inputDevice = Room.audioDeviceModule.inputDevice
self.objectWillChange.send()
}
}
Expand Down
2 changes: 2 additions & 0 deletions Shared/RoomView.swift
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Expand Up @@ -483,6 +483,8 @@ struct RoomView: View {
}

Toggle("Prefer speaker output", isOn: $appCtx.preferSpeakerOutput)

Toggle("(Demo) Audio Capture-post processing", isOn: $appCtx.sampleCapturePostProcessingEnabled)
}

} label: {
Expand Down