Add SwiftUI demo project (#175)

ios-swiftui/SherpaNcnn/SherpaNcnn.xcodeproj/project.pbxproj

@@ -0,0 +1,392 @@
+// !$*UTF8*$!
+{
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+		DEB8742629DD7E80001EF156 /* SherpaNcnnViewModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = DEB8742529DD7E80001EF156 /* SherpaNcnnViewModel.swift */; };
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+		DEB8742529DD7E80001EF156 /* SherpaNcnnViewModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SherpaNcnnViewModel.swift; sourceTree = "<group>"; };
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+			files = (
+				DEB8742A29DD8088001EF156 /* openmp.xcframework in Frameworks */,
+				DEB8742B29DD8088001EF156 /* sherpa-ncnn.xcframework in Frameworks */,
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+			isa = PBXGroup;
+			children = (
+				DEB8741129DD7C7A001EF156 /* SherpaNcnn */,
+				DEB8741029DD7C7A001EF156 /* Products */,
+				DEB8742729DD8088001EF156 /* Frameworks */,
+			);
+			sourceTree = "<group>";
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+		DEB8741029DD7C7A001EF156 /* Products */ = {
+			isa = PBXGroup;
+			children = (
+				DEB8740F29DD7C7A001EF156 /* SherpaNcnn.app */,
+			);
+			name = Products;
+			sourceTree = "<group>";
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+		DEB8741129DD7C7A001EF156 /* SherpaNcnn */ = {
+			isa = PBXGroup;
+			children = (
+				DEB8745629DE5BC6001EF156 /* SherpaNcnn-Bridging-Header.h */,
+				DEB8745729DE5BE3001EF156 /* SherpaNcnn.swift */,
+				DEB8741229DD7C7A001EF156 /* SherpaNcnnApp.swift */,
+				DEB8741429DD7C7A001EF156 /* ContentView.swift */,
+				DEB8742529DD7E80001EF156 /* SherpaNcnnViewModel.swift */,
+				DEB8742F29DD82F9001EF156 /* Model.swift */,
+				DEB8743129DD8334001EF156 /* Extension.swift */,
+				DEB8741629DD7C7A001EF156 /* Assets.xcassets */,
+				DEB8741829DD7C7A001EF156 /* Preview Content */,
+			);
+			path = SherpaNcnn;
+			sourceTree = "<group>";
+		};
+		DEB8741829DD7C7A001EF156 /* Preview Content */ = {
+			isa = PBXGroup;
+			children = (
+				DEB8741929DD7C7A001EF156 /* Preview Assets.xcassets */,
+			);
+			path = "Preview Content";
+			sourceTree = "<group>";
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+			isa = PBXGroup;
+			children = (
+				DEB8742C29DD80B3001EF156 /* libc++.tbd */,
+				DEB8742829DD8088001EF156 /* openmp.xcframework */,
+				DEB8742929DD8088001EF156 /* sherpa-ncnn.xcframework */,
+			);
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+				DEB8740B29DD7C7A001EF156 /* Sources */,
+				DEB8740C29DD7C7A001EF156 /* Frameworks */,
+				DEB8740D29DD7C7A001EF156 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = SherpaNcnn;
+			productName = SherpaNcnn;
+			productReference = DEB8740F29DD7C7A001EF156 /* SherpaNcnn.app */;
+			productType = "com.apple.product-type.application";
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+
+/* Begin PBXProject section */
+		DEB8740729DD7C7A001EF156 /* Project object */ = {
+			isa = PBXProject;
+			attributes = {
+				BuildIndependentTargetsInParallel = 1;
+				LastSwiftUpdateCheck = 1430;
+				LastUpgradeCheck = 1430;
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+					DEB8740E29DD7C7A001EF156 = {
+						CreatedOnToolsVersion = 14.3;
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+			compatibilityVersion = "Xcode 14.0";
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+			knownRegions = (
+				en,
+				Base,
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+			mainGroup = DEB8740629DD7C7A001EF156;
+			productRefGroup = DEB8741029DD7C7A001EF156 /* Products */;
+			projectDirPath = "";
+			projectRoot = "";
+			targets = (
+				DEB8740E29DD7C7A001EF156 /* SherpaNcnn */,
+			);
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+/* End PBXProject section */
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+			files = (
+				DEB8741A29DD7C7A001EF156 /* Preview Assets.xcassets in Resources */,
+				DEB8741729DD7C7A001EF156 /* Assets.xcassets in Resources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
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+			files = (
+				DEB8743029DD82F9001EF156 /* Model.swift in Sources */,
+				DEB8742629DD7E80001EF156 /* SherpaNcnnViewModel.swift in Sources */,
+				DEB8741529DD7C7A001EF156 /* ContentView.swift in Sources */,
+				DEB8743229DD8334001EF156 /* Extension.swift in Sources */,
+				DEB8741329DD7C7A001EF156 /* SherpaNcnnApp.swift in Sources */,
+				DEB8745829DE5BE3001EF156 /* SherpaNcnn.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
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+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
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+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
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+				ENABLE_TESTABILITY = YES;
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+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
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+					"$(inherited)",
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+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
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+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
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+			name = Debug;
+		};
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+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++20";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
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+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				MTL_FAST_MATH = YES;
+				SDKROOT = iphoneos;
+				SWIFT_COMPILATION_MODE = wholemodule;
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Release;
+		};
+		DEB8741E29DD7C7A001EF156 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CODE_SIGN_STYLE = Manual;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_ASSET_PATHS = "\"SherpaNcnn/Preview Content\"";
+				DEVELOPMENT_TEAM = "";
+				ENABLE_PREVIEWS = YES;
+				FRAMEWORK_SEARCH_PATHS = "$(PROJECT_DIR)/../../build-ios/";
+				GENERATE_INFOPLIST_FILE = YES;
+				HEADER_SEARCH_PATHS = "${PROJECT_DIR}/../../build-ios/sherpa-ncnn.xcframework/Headers/";
+				INFOPLIST_KEY_NSMicrophoneUsageDescription = "Need microphone access for recording speech";
+				INFOPLIST_KEY_UIApplicationSceneManifest_Generation = YES;
+				INFOPLIST_KEY_UIApplicationSupportsIndirectInputEvents = YES;
+				INFOPLIST_KEY_UILaunchScreen_Generation = YES;
+				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPad = "UIInterfaceOrientationPortrait UIInterfaceOrientationPortraitUpsideDown UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
+				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPhone = "UIInterfaceOrientationPortrait UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
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+				OTHER_LDFLAGS = "-lc++";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.k2-fsa.org.SherpaNcnn";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				PROVISIONING_PROFILE_SPECIFIER = "";
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_OBJC_BRIDGING_HEADER = "${PROJECT_DIR}/../../swift-api-examples/SherpaNcnn-Bridging-Header.h";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		DEB8741F29DD7C7A001EF156 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CODE_SIGN_STYLE = Manual;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_ASSET_PATHS = "\"SherpaNcnn/Preview Content\"";
+				DEVELOPMENT_TEAM = "";
+				ENABLE_PREVIEWS = YES;
+				FRAMEWORK_SEARCH_PATHS = "$(PROJECT_DIR)/../../build-ios/";
+				GENERATE_INFOPLIST_FILE = YES;
+				HEADER_SEARCH_PATHS = "${PROJECT_DIR}/../../build-ios/sherpa-ncnn.xcframework/Headers/";
+				INFOPLIST_KEY_NSMicrophoneUsageDescription = "Need microphone access for recording speech";
+				INFOPLIST_KEY_UIApplicationSceneManifest_Generation = YES;
+				INFOPLIST_KEY_UIApplicationSupportsIndirectInputEvents = YES;
+				INFOPLIST_KEY_UILaunchScreen_Generation = YES;
+				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPad = "UIInterfaceOrientationPortrait UIInterfaceOrientationPortraitUpsideDown UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
+				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPhone = "UIInterfaceOrientationPortrait UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				MARKETING_VERSION = 1.0;
+				OTHER_LDFLAGS = "-lc++";
+				PRODUCT_BUNDLE_IDENTIFIER = "com.k2-fsa.org.SherpaNcnn";
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				PROVISIONING_PROFILE_SPECIFIER = "";
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_OBJC_BRIDGING_HEADER = "${PROJECT_DIR}/../../swift-api-examples/SherpaNcnn-Bridging-Header.h";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		DEB8740A29DD7C7A001EF156 /* Build configuration list for PBXProject "SherpaNcnn" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				DEB8741B29DD7C7A001EF156 /* Debug */,
+				DEB8741C29DD7C7A001EF156 /* Release */,
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+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
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+		DEB8741D29DD7C7A001EF156 /* Build configuration list for PBXNativeTarget "SherpaNcnn" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
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+				DEB8741F29DD7C7A001EF156 /* Release */,
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+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = DEB8740729DD7C7A001EF156 /* Project object */;
+}

ios-swiftui/SherpaNcnn/SherpaNcnn.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>

ios-swiftui/SherpaNcnn/SherpaNcnn.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?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>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

ios-swiftui/SherpaNcnn/SherpaNcnn/Assets.xcassets/AccentColor.colorset/Contents.json

@@ -0,0 +1,11 @@
+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

ios-swiftui/SherpaNcnn/SherpaNcnn/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,14 @@
+{
+  "images" : [
+    {
+      "filename" : "k2-1024x1024.png",
+      "idiom" : "universal",
+      "platform" : "ios",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

ios-swiftui/SherpaNcnn/SherpaNcnn/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

ios-swiftui/SherpaNcnn/SherpaNcnn/ContentView.swift

@@ -0,0 +1,46 @@
+//
+//  ContentView.swift
+//  SherpaNcnn
+//
+//  Created by knight on 2023/4/5.
+//
+
+import SwiftUI
+
+struct ContentView: View {
+    @StateObject var sherpaNcnnVM = SherpaNcnnViewModel()
+    
+    var body: some View {
+        VStack {
+            Text("ASR with Next-gen Kaldi")
+                .font(.title)
+            if sherpaNcnnVM.status == .stop {
+                Text("See https://github.com/k2-fsa/sherpa-ncnn")
+                Text("Press the Start button to run!")
+            }
+            ScrollView(.vertical, showsIndicators: true) {
+                HStack {
+                    Text(sherpaNcnnVM.subtitles)
+                    Spacer()
+                }
+            }
+            Spacer()
+            Button {
+                toggleRecorder()
+            } label: {
+                Text(sherpaNcnnVM.status == .stop ? "Start" : "Stop")
+            }
+        }
+        .padding()
+    }
+    
+    private func toggleRecorder() {
+        sherpaNcnnVM.toggleRecorder()
+    }
+}
+
+struct ContentView_Previews: PreviewProvider {
+    static var previews: some View {
+        ContentView()
+    }
+}

ios-swiftui/SherpaNcnn/SherpaNcnn/Extension.swift

@@ -0,0 +1,20 @@
+//
+//  Extension.swift
+//  SherpaNcnn
+//
+//  Created by knight on 2023/4/5.
+//
+
+import AVFoundation
+
+extension AudioBuffer {
+    func array() -> [Float] {
+        return Array(UnsafeBufferPointer(self))
+    }
+}
+
+extension AVAudioPCMBuffer {
+    func array() -> [Float] {
+        return self.audioBufferList.pointee.mBuffers.array()
+    }
+}

ios-swiftui/SherpaNcnn/SherpaNcnn/Model.swift

@@ -0,0 +1,134 @@
+import Foundation
+
+func getResource(_ forResource: String, _ ofType: String) -> String {
+  let path = Bundle.main.path(forResource: forResource, ofType: ofType)
+  precondition(
+    path != nil,
+    "\(forResource).\(ofType) does not exist!\n" + "Remember to change \n"
+      + "  Build Phases -> Copy Bundle Resources\n" + "to add it!"
+  )
+  return path!
+}
+/// Please refer to
+/// https://k2-fsa.github.io/sherpa/ncnn/pretrained_models/index.html
+/// to download pre-trained models
+
+/// csukuangfj/sherpa-ncnn-conv-emformer-transducer-2022-12-06 (Chinese + English)
+func getMultilingualModelConfig2022_12_06() -> SherpaNcnnModelConfig {
+  let encoderParam = getResource("encoder_jit_trace-pnnx.ncnn", "param")
+  let encoderBin = getResource("encoder_jit_trace-pnnx.ncnn", "bin")
+  let decoderParam = getResource("decoder_jit_trace-pnnx.ncnn", "param")
+  let decoderBin = getResource("decoder_jit_trace-pnnx.ncnn", "bin")
+  let joinerParam = getResource("joiner_jit_trace-pnnx.ncnn", "param")
+  let joinerBin = getResource("joiner_jit_trace-pnnx.ncnn", "bin")
+  let tokens = getResource("tokens", "txt")
+
+  return sherpaNcnnModelConfig(
+    encoderParam: encoderParam,
+    encoderBin: encoderBin,
+    decoderParam: decoderParam,
+    decoderBin: decoderBin,
+    joinerParam: joinerParam,
+    joinerBin: joinerBin,
+    tokens: tokens,
+    numThreads: 4
+  )
+}
+
+/// csukuangfj/sherpa-ncnn-conv-emformer-transducer-2022-12-06 (Chinese + English)
+func getMultilingualModelConfig2022_12_06_Int8() -> SherpaNcnnModelConfig {
+  let encoderParam = getResource("encoder_jit_trace-pnnx.ncnn.int8", "param")
+  let encoderBin = getResource("encoder_jit_trace-pnnx.ncnn.int8", "bin")
+  let decoderParam = getResource("decoder_jit_trace-pnnx.ncnn", "param")
+  let decoderBin = getResource("decoder_jit_trace-pnnx.ncnn", "bin")
+  let joinerParam = getResource("joiner_jit_trace-pnnx.ncnn.int8", "param")
+  let joinerBin = getResource("joiner_jit_trace-pnnx.ncnn.int8", "bin")
+  let tokens = getResource("tokens", "txt")
+
+  return sherpaNcnnModelConfig(
+    encoderParam: encoderParam,
+    encoderBin: encoderBin,
+    decoderParam: decoderParam,
+    decoderBin: decoderBin,
+    joinerParam: joinerParam,
+    joinerBin: joinerBin,
+    tokens: tokens,
+    numThreads: 4
+  )
+}
+
+/// marcoyang/sherpa-ncnn-conv-emformer-transducer-small-2023-01-09 (English)
+func getConvEmformerSmallEnglishModelConfig2023_01_09() -> SherpaNcnnModelConfig {
+  let encoderParam = getResource("encoder_jit_trace-pnnx.ncnn", "param")
+  let encoderBin = getResource("encoder_jit_trace-pnnx.ncnn", "bin")
+  let decoderParam = getResource("decoder_jit_trace-pnnx.ncnn", "param")
+  let decoderBin = getResource("decoder_jit_trace-pnnx.ncnn", "bin")
+  let joinerParam = getResource("joiner_jit_trace-pnnx.ncnn", "param")
+  let joinerBin = getResource("joiner_jit_trace-pnnx.ncnn", "bin")
+  let tokens = getResource("tokens", "txt")
+
+  return sherpaNcnnModelConfig(
+    encoderParam: encoderParam,
+    encoderBin: encoderBin,
+    decoderParam: decoderParam,
+    decoderBin: decoderBin,
+    joinerParam: joinerParam,
+    joinerBin: joinerBin,
+    tokens: tokens,
+    numThreads: 4
+  )
+}
+
+/// marcoyang/sherpa-ncnn-conv-emformer-transducer-small-2023-01-09 (English)
+func getConvEmformerSmallEnglishModelConfig2023_01_09_Int8() -> SherpaNcnnModelConfig {
+  let encoderParam = getResource("encoder_jit_trace-pnnx.ncnn.int8", "param")
+  let encoderBin = getResource("encoder_jit_trace-pnnx.ncnn.int8", "bin")
+  let decoderParam = getResource("decoder_jit_trace-pnnx.ncnn", "param")
+  let decoderBin = getResource("decoder_jit_trace-pnnx.ncnn", "bin")
+  let joinerParam = getResource("joiner_jit_trace-pnnx.ncnn.int8", "param")
+  let joinerBin = getResource("joiner_jit_trace-pnnx.ncnn.int8", "bin")
+  let tokens = getResource("tokens", "txt")
+
+  return sherpaNcnnModelConfig(
+    encoderParam: encoderParam,
+    encoderBin: encoderBin,
+    decoderParam: decoderParam,
+    decoderBin: decoderBin,
+    joinerParam: joinerParam,
+    joinerBin: joinerBin,
+    tokens: tokens,
+    numThreads: 4
+  )
+}
+/// marcoyang/sherpa-ncnn-conv-emformer-transducer-small-2023-01-09 (English)
+func getLstmTransducerEnglish_2022_09_05() -> SherpaNcnnModelConfig {
+  let encoderParam = getResource(
+    "encoder_jit_trace-v2-iter-468000-avg-16-pnnx.ncnn", "param")
+  let encoderBin = getResource(
+    "encoder_jit_trace-v2-iter-468000-avg-16-pnnx.ncnn", "bin")
+  let decoderParam = getResource(
+    "decoder_jit_trace-v2-iter-468000-avg-16-pnnx.ncnn", "param")
+  let decoderBin = getResource(
+    "decoder_jit_trace-v2-iter-468000-avg-16-pnnx.ncnn", "bin")
+  let joinerParam = getResource(
+    "joiner_jit_trace-v2-iter-468000-avg-16-pnnx.ncnn", "param")
+  let joinerBin = getResource(
+    "joiner_jit_trace-v2-iter-468000-avg-16-pnnx.ncnn", "bin")
+  let tokens = getResource("tokens", "txt")
+
+  return sherpaNcnnModelConfig(
+    encoderParam: encoderParam,
+    encoderBin: encoderBin,
+    decoderParam: decoderParam,
+    decoderBin: decoderBin,
+    joinerParam: joinerParam,
+    joinerBin: joinerBin,
+    tokens: tokens,
+    numThreads: 4
+  )
+}
+
+/// Please refer to
+/// https://k2-fsa.github.io/sherpa/ncnn/pretrained_models/index.html
+/// to add more models if you need
+

ios-swiftui/SherpaNcnn/SherpaNcnn/Preview Content/Preview Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

ios-swiftui/SherpaNcnn/SherpaNcnn/SherpaNcnnApp.swift

@@ -0,0 +1,17 @@
+//
+//  SherpaNcnnApp.swift
+//  SherpaNcnn
+//
+//  Created by knight on 2023/4/5.
+//
+
+import SwiftUI
+
+@main
+struct SherpaNcnnApp: App {
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+    }
+}

ios-swiftui/SherpaNcnn/SherpaNcnn/SherpaNcnnViewModel.swift

@@ -0,0 +1,189 @@
+//
+//  SherpaNcnnViewModel.swift
+//  SherpaNcnn
+//
+//  Created by knight on 2023/4/5.
+//
+
+import Foundation
+import AVFoundation
+
+enum Status {
+    case stop
+    case recording
+}
+
+class SherpaNcnnViewModel: ObservableObject {
+    @Published var status: Status = .stop
+    @Published var subtitles: String = ""
+    
+    var sentences: [String] = []
+    
+    var audioEngine: AVAudioEngine? = nil
+    var recognizer: SherpaNcnnRecognizer! = nil
+    
+    var lastSentence: String = ""
+    let maxSentence: Int = 20
+    
+    var results: String {
+        if sentences.isEmpty && lastSentence.isEmpty {
+            return ""
+        }
+        if sentences.isEmpty {
+            return "0: \(lastSentence.lowercased())"
+        }
+
+        let start = max(sentences.count - maxSentence, 0)
+        if lastSentence.isEmpty {
+            return sentences.enumerated().map { (index, s) in "\(index): \(s.lowercased())" }[start...]
+                .joined(separator: "\n")
+        } else {
+            return sentences.enumerated().map { (index, s) in "\(index): \(s.lowercased())" }[start...]
+                .joined(separator: "\n") + "\n\(sentences.count): \(lastSentence.lowercased())"
+        }
+    }
+    
+    func updateLabel() {
+        DispatchQueue.main.async {
+            self.subtitles = self.results
+        }
+    }
+    
+    init() {
+        initRecognizer()
+        initRecorder()
+    }
+    
+    private func initRecognizer() {
+        // Please select one model that is best suitable for you.
+        //
+        // You can also modify Model.swift to add new pre-trained models from
+        // https://k2-fsa.github.io/sherpa/ncnn/pretrained_models/index.html
+        let featConfig = sherpaNcnnFeatureExtractorConfig(
+            sampleRate: 16000,
+            featureDim: 80)
+
+        let modelConfig = getMultilingualModelConfig2022_12_06()
+        // let modelConfig = getMultilingualModelConfig2022_12_06_Int8()
+        // let modelConfig = getConvEmformerSmallEnglishModelConfig2023_01_09()
+        // let modelConfig = getConvEmformerSmallEnglishModelConfig2023_01_09_Int8()
+        // let modelConfig = getLstmTransducerEnglish_2022_09_05()
+
+        let decoderConfig = sherpaNcnnDecoderConfig(
+            decodingMethod: "modified_beam_search",
+            numActivePaths: 4)
+
+        var config = sherpaNcnnRecognizerConfig(
+            featConfig: featConfig,
+            modelConfig: modelConfig,
+            decoderConfig: decoderConfig,
+            enableEndpoint: true,
+            rule1MinTrailingSilence: 1.2,
+            rule2MinTrailingSilence: 2.4,
+            rule3MinUtteranceLength: 200)
+
+        recognizer = SherpaNcnnRecognizer(config: &config)
+    }
+    
+    private func initRecorder() {
+        print("init recorder")
+        audioEngine = AVAudioEngine()
+        let inputNode = self.audioEngine?.inputNode
+        let bus = 0
+        let inputFormat = inputNode?.outputFormat(forBus: bus)
+        let outputFormat = AVAudioFormat(
+            commonFormat: .pcmFormatFloat32,
+            sampleRate: 16000, channels: 1,
+            interleaved: false)!
+
+        let converter = AVAudioConverter(from: inputFormat!, to: outputFormat)!
+
+        inputNode!.installTap(
+            onBus: bus,
+            bufferSize: 1024,
+            format: inputFormat
+        ) {
+            (buffer: AVAudioPCMBuffer, when: AVAudioTime) in
+            var newBufferAvailable = true
+
+            let inputCallback: AVAudioConverterInputBlock = {
+                inNumPackets, outStatus in
+                if newBufferAvailable {
+                    outStatus.pointee = .haveData
+                    newBufferAvailable = false
+
+                    return buffer
+                } else {
+                    outStatus.pointee = .noDataNow
+                    return nil
+                }
+            }
+
+            let convertedBuffer = AVAudioPCMBuffer(
+                pcmFormat: outputFormat,
+                frameCapacity:
+                    AVAudioFrameCount(outputFormat.sampleRate)
+                * buffer.frameLength
+                / AVAudioFrameCount(buffer.format.sampleRate))!
+
+            var error: NSError?
+            let _ = converter.convert(
+                to: convertedBuffer,
+                error: &error, withInputFrom: inputCallback)
+
+            // TODO(fangjun): Handle status != haveData
+
+            let array = convertedBuffer.array()
+            if !array.isEmpty {
+                self.recognizer.acceptWaveform(samples: array)
+                while (self.recognizer.isReady()){
+                    self.recognizer.decode()
+                }
+                let isEndpoint = self.recognizer.isEndpoint()
+                let text = self.recognizer.getResult().text
+
+                if !text.isEmpty && self.lastSentence != text {
+                    self.lastSentence = text
+                    self.updateLabel()
+                    print(text)
+                }
+
+                if isEndpoint{
+                    if !text.isEmpty {
+                        let tmp = self.lastSentence
+                        self.lastSentence = ""
+                        self.sentences.append(tmp)
+                    }
+                    self.recognizer.reset()
+                }
+            }
+        }
+    }
+    
+    public func toggleRecorder() {
+        if status == .stop {
+            startRecorder()
+            status = .recording
+        } else {
+            stopRecorder()
+            status = .stop
+        }
+    }
+
+    private func startRecorder() {
+        lastSentence = ""
+        sentences = []
+
+        do {
+            try self.audioEngine?.start()
+        } catch let error as NSError {
+            print("Got an error starting audioEngine: \(error.domain), \(error)")
+        }
+        print("started")
+    }
+
+    private func stopRecorder() {
+        audioEngine?.stop()
+        print("stopped")
+    }
+}