Allow setting rate on the fly

Author: mihai8804858

ChunkedAudioPlayer.xcworkspace/xcshareddata/xcschemes/ChunkedAudioPlayer.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1530"
+   LastUpgradeVersion = "1600"
    version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"

Example/Example.xcodeproj/project.pbxproj

@@ -128,7 +128,7 @@
 			attributes = {
 				BuildIndependentTargetsInParallel = 1;
 				LastSwiftUpdateCheck = 1520;
-				LastUpgradeCheck = 1530;
+				LastUpgradeCheck = 1600;
 				TargetAttributes = {
 					995EF5E82B815F17000B5E39 = {
 						CreatedOnToolsVersion = 15.2;
@@ -306,7 +306,6 @@
 		995EF5F92B815F1C000B5E39 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CODE_SIGN_STYLE = Automatic;
@@ -332,7 +331,7 @@
 				"LD_RUNPATH_SEARCH_PATHS[sdk=macosx*]" = "@executable_path/../Frameworks";
 				MACOSX_DEPLOYMENT_TARGET = 14.0;
 				MARKETING_VERSION = 1.0;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.mseremet.Example-Chunked-Audio-Player";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.mseremet.chunked-audio-player-example";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = auto;
 				SUPPORTED_PLATFORMS = "appletvos appletvsimulator iphoneos iphonesimulator macosx xros xrsimulator";
@@ -350,7 +349,6 @@
 		995EF5FA2B815F1C000B5E39 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
 				CODE_SIGN_STYLE = Automatic;
@@ -376,7 +374,7 @@
 				"LD_RUNPATH_SEARCH_PATHS[sdk=macosx*]" = "@executable_path/../Frameworks";
 				MACOSX_DEPLOYMENT_TARGET = 14.0;
 				MARKETING_VERSION = 1.0;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.mseremet.Example-Chunked-Audio-Player";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.mseremet.chunked-audio-player-example";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = auto;
 				SUPPORTED_PLATFORMS = "appletvos appletvsimulator iphoneos iphonesimulator macosx xros xrsimulator";

Example/Example.xcodeproj/xcshareddata/xcschemes/Example.xcscheme

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1530"
+   LastUpgradeVersion = "1600"
    version = "1.7">
    <BuildAction
       parallelizeBuildables = "YES"

Example/Example/LocalFileView.swift

@@ -22,11 +22,20 @@ struct LocalFileView: View {
         }
     }
 
+    private var rateBinding: Binding<Float> {
+        Binding<Float> {
+            player.rate
+        } set: { rate in
+            player.rate = rate
+        }
+    }
+
     var body: some View {
         VStack(alignment: .center, spacing: 24) {
             pathLabel
             controlsView
             volumeView
+            rateView
         }
         .padding()
         .frame(maxHeight: .infinity)
@@ -56,6 +65,9 @@ struct LocalFileView: View {
         .onChange(of: player.currentRate) { _, rate in
             print("Rate = \(rate)")
         }
+        .onChange(of: player.currentState) { _, state in
+            print("State = \(state)")
+        }
         #if os(iOS) || os(visionOS)
         .navigationBarTitleDisplayMode(.inline)
         #endif
@@ -101,6 +113,15 @@ struct LocalFileView: View {
         .frame(maxWidth: 200)
     }
 
+    @ViewBuilder
+    private var rateView: some View {
+        VStack {
+            Text("Rate: \(player.rate.formatted(.number.precision(.fractionLength(2))))")
+            Slider(value: rateBinding, in: 0...1, step: 0.01)
+        }
+        .frame(maxWidth: 200)
+    }
+
     private func performConversion() {
         player.start(makeSampleStream(), type: kAudioFileMP3Type)
     }

Example/Example/Resources/Info.plist

@@ -7,5 +7,9 @@
 		<key>NSAllowsArbitraryLoads</key>
 		<true/>
 	</dict>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>audio</string>
+	</array>
 </dict>
 </plist>

Example/Example/TextToSpeechView.swift

@@ -37,11 +37,20 @@ struct TextToSpeechView: View {
         }
     }
 
+    private var rateBinding: Binding<Float> {
+        Binding<Float> {
+            player.rate
+        } set: { rate in
+            player.rate = rate
+        }
+    }
+
     var body: some View {
         VStack(alignment: .center, spacing: 24) {
             inputTextField
             controlsView
             volumeView
+            rateView
         }
         .padding()
         .frame(maxHeight: .infinity)
@@ -88,6 +97,9 @@ struct TextToSpeechView: View {
         .onChange(of: player.currentRate) { _, rate in
             print("Rate = \(rate)")
         }
+        .onChange(of: player.currentState) { _, state in
+            print("State = \(state)")
+        }
         #if os(iOS) || os(visionOS)
         .navigationBarTitleDisplayMode(.inline)
         #endif
@@ -133,6 +145,15 @@ struct TextToSpeechView: View {
         .frame(maxWidth: 200)
     }
 
+    @ViewBuilder
+    private var rateView: some View {
+        VStack {
+            Text("Rate: \(player.rate.formatted(.number.precision(.fractionLength(2))))")
+            Slider(value: rateBinding, in: 0...1, step: 0.01)
+        }
+        .frame(maxWidth: 200)
+    }
+
     @ViewBuilder
     private var settingsMenu: some View {
         Menu {

README.md

@@ -55,19 +55,23 @@ player.start(stream, type: kAudioFileMP3Type)
 * Listen for changes:
 
 ```swift
-player.$state.sink { state in
+player.$currentState.sink { state in
   // handle player state
 }.store(in: &bag)
 
-player.$rate.sink { rate in
+player.$currentRate.sink { rate in
   // handle player rate
 }.store(in: &bag)
 
+player.$currentDuration.sink { duration in
+  // handle player duration
+}.store(in: &bag)
+
 player.$currentTime.sink { time in
   // handle player time
 }.store(in: &bag)
 
-player.$error.sink { error in
+player.$currentError.sink { error in
   if let error {
     // handle player error
   }
@@ -77,6 +81,15 @@ player.$error.sink { error in
 * Control playback:
 
 ```swift
+// Set stream volume
+player.volume = 0.5
+
+// Set muted
+player.isMuted = true
+
+// Set stream rate
+player.rate = 0.5
+
 // Pause current stream
 player.pause()
 
@@ -85,6 +98,15 @@ player.resume()
 
 // Stop current stream
 player.stop()
+
+// Rewind 5 seconds
+player.rewind(CMTime(seconds: 5.0, preferredTimescale: 1000))
+
+// Forward 5 seconds
+player.forward(CMTime(seconds: 5.0, preferredTimescale: 1000))
+
+// Seek to specific time
+player.seek(to: CMTime(seconds: 60, preferredTimescale: 1000))
 ```
 
 * SwiftUI Support
@@ -95,10 +117,11 @@ struct ContentView: View {
   @ObservedObject private var player = AudioPlayer()
 
   var body: some View {
-    Text("State \(player.state)")
-    Text("Rate \(player.rate)")
+    Text("State \(player.currentState)")
+    Text("Rate \(player.currentRate)")
     Text("Time \(player.currentTime)")
-    if let error = player.error {
+    Text("Duration \(player.currentDuration)")
+    if let error = player.currentError {
         Text("Error \(error)")
     }
   }

Sources/AudioSynchronizer.swift

@@ -44,7 +44,15 @@ final class AudioSynchronizer {
         set { audioRenderer?.isMuted = newValue }
     }
 
-    var desiredRate: Float = 1.0
+    var desiredRate: Float = 1.0 {
+        didSet {
+            if desiredRate == 0.0 {
+                pause()
+            } else {
+                resume(at: desiredRate)
+            }
+        }
+    }
 
     init(
         timeUpdateInterval: CMTime,
@@ -91,10 +99,15 @@ final class AudioSynchronizer {
         onPaused()
     }
 
-    func resume() {
-        guard let audioSynchronizer, audioSynchronizer.rate == 0.0 else { return }
-        audioSynchronizer.rate = desiredRate
-        onPlaying()
+    func resume(at rate: Float? = nil) {
+        guard let audioSynchronizer else { return }
+        let oldRate = audioSynchronizer.rate
+        let newRate = rate ?? desiredRate
+        guard audioSynchronizer.rate != newRate else { return }
+        audioSynchronizer.rate = newRate
+        if oldRate == 0.0 && newRate > 0.0 {
+            onPlaying()
+        }
     }
 
     func rewind(_ time: CMTime) {
@@ -155,7 +168,6 @@ final class AudioSynchronizer {
     private func onFileStreamDescriptionReceived(asbd: AudioStreamBasicDescription) {
         let renderer = AVSampleBufferAudioRenderer()
         let synchronizer = AVSampleBufferRenderSynchronizer()
-        synchronizer.rate = desiredRate
         synchronizer.addRenderer(renderer)
         audioRenderer = renderer
         audioSynchronizer = synchronizer