chore: import upstream snapshot with attribution

csharp/README.md

@@ -0,0 +1,12 @@
+This is a nuget-based wrapper for libvosk library
+
+See demo folder for example how to use the library. You can simply run
+"dotnet run" to run the demo. Make sure you unpacked the model and the
+test file.
+
+See the nuget folder for the sources of the wrapper. Run build.sh to
+build nuget package.
+
+Note we only support win64 and linux64 for now. No support for win32
+since it is a little bit painful to load the libraries depending on
+architecture. In theory we can add OSX some time or even Android.

csharp/demo/VoskDemo.cs

@@ -0,0 +1,83 @@
+using System;
+using System.IO;
+using Vosk;
+
+public class VoskDemo
+{
+   public static void DemoBytes(Model model)
+   {
+        // Demo byte buffer
+        VoskRecognizer rec = new VoskRecognizer(model, 16000.0f);
+        rec.SetMaxAlternatives(0);
+        rec.SetWords(true);
+        using(Stream source = File.OpenRead("test.wav")) {
+            byte[] buffer = new byte[4096];
+            int bytesRead;
+            while((bytesRead = source.Read(buffer, 0, buffer.Length)) > 0) {
+                if (rec.AcceptWaveform(buffer, bytesRead)) {
+                    Console.WriteLine(rec.Result());
+                } else {
+                    Console.WriteLine(rec.PartialResult());
+                }
+            }
+        }
+        Console.WriteLine(rec.FinalResult());
+   }
+
+   public static void DemoFloats(Model model)
+   {
+        // Demo float array
+        VoskRecognizer rec = new VoskRecognizer(model, 16000.0f);
+
+        rec.SetEndpointerMode(EndpointerMode.LONG);
+
+        using(Stream source = File.OpenRead("test.wav")) {
+            byte[] buffer = new byte[4096];
+            int bytesRead;
+            while((bytesRead = source.Read(buffer, 0, buffer.Length)) > 0) {
+                float[] fbuffer = new float[bytesRead / 2];
+                for (int i = 0, n = 0; i < fbuffer.Length; i++, n+=2) {
+                    fbuffer[i] = BitConverter.ToInt16(buffer, n);
+                }
+                if (rec.AcceptWaveform(fbuffer, fbuffer.Length)) {
+                    Console.WriteLine(rec.Result());
+                } else {
+                    Console.WriteLine(rec.PartialResult());
+                }
+            }
+        }
+        Console.WriteLine(rec.FinalResult());
+   }
+
+   public static void DemoSpeaker(Model model)
+   {
+        // Output speakers
+        SpkModel spkModel = new SpkModel("model-spk");
+        VoskRecognizer rec = new VoskRecognizer(model, 16000.0f);
+        rec.SetSpkModel(spkModel);
+
+        using(Stream source = File.OpenRead("test.wav")) {
+            byte[] buffer = new byte[4096];
+            int bytesRead;
+            while((bytesRead = source.Read(buffer, 0, buffer.Length)) > 0) {
+                if (rec.AcceptWaveform(buffer, bytesRead)) {
+                    Console.WriteLine(rec.Result());
+                } else {
+                    Console.WriteLine(rec.PartialResult());
+                }
+            }
+        }
+        Console.WriteLine(rec.FinalResult());
+   }
+
+   public static void Main()
+   {
+        // You can set to -1 to disable logging messages
+        Vosk.Vosk.SetLogLevel(0);
+
+        Model model = new Model("model");
+        DemoBytes(model);
+        DemoFloats(model);
+        DemoSpeaker(model);
+   }
+}

csharp/demo/VoskDemo.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>VoskDemo</RootNamespace>
+  </PropertyGroup>
+
+  <PropertyGroup>
+    <RestoreSources>$(RestoreSources);../nuget</RestoreSources>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Vosk" Version="0.3.75" />
+  </ItemGroup>
+
+</Project>

csharp/nuget/Vosk.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <PackageId>Vosk</PackageId>
+    <Version>0.3.75</Version>
+    <authors>Alpha Cephei Inc</authors>
+    <owners>Alpha Cephei Inc</owners>
+  </PropertyGroup>
+
+  <Target Name="CopyFiles" AfterTargets="Build">
+    <Copy SourceFiles="bin/Release/net8.0/Vosk.dll" DestinationFolder="lib/net8.0" />
+  </Target>
+
+</Project>

csharp/nuget/Vosk.nuspec

@@ -0,0 +1,32 @@
+<?xml version="1.0"?>
+<package>
+  <metadata>
+    <id>Vosk</id>
+    <version>0.3.75</version>
+    <authors>Alpha Cephei Inc</authors>
+    <owners>Alpha Cephei Inc</owners>
+    <license type="expression">Apache-2.0</license>
+    <projectUrl>https://alphacephei.com/vosk/</projectUrl>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <title>Vosk Speech Recognition Toolkit</title>
+    <description>Vosk is an offline open source speech recognition toolkit. It enables speech recognition models for 20+ languages and dialects - English, Indian English, German, French, Spanish, Portuguese, Chinese, Russian, Turkish, Vietnamese, Italian, Dutch, Catalan, Arabic, Greek, Farsi, Filipino, Ukrainian, Kazakh, Swedish, Japanese, Esperanto, Hindi, Czech. More to come.
+
+Vosk models are small (50 Mb) but provide continuous large vocabulary transcription, zero-latency response with streaming API, reconfigurable vocabulary and speaker identification.
+
+Speech recognition bindings implemented for various programming languages like Python, Java, Node.JS, C#, C++ and others.
+
+Vosk supplies speech recognition for chatbots, smart home appliances, virtual assistants. It can also create subtitles for movies, transcription for lectures and interviews.
+
+Vosk scales from small devices like Raspberry Pi or Android smartphone to big clusters.</description>
+    <releaseNotes>See for details https://github.com/alphacep/vosk-api/releases</releaseNotes>
+    <repository type="git" url="https://github.com/alphacep/vosk-api.git" branch="master"/>
+    <copyright>Copyright 2020-2050 Alpha Cephei Inc</copyright>
+    <tags>speech recognition voice stt asr speech-to-text ai offline privacy</tags>
+    <dependencies>
+      <group targetFramework="net8.0"/>
+    </dependencies>
+  </metadata>
+  <files>
+    <file src="**" exclude="bin/**;obj/**;build.sh;src/*.cs;*.nupkg;**/.keep-me" />
+  </files>
+</package>

csharp/nuget/build.sh

@@ -0,0 +1,2 @@
+rm -rf bin lib obj
+/home/shmyrev/local/dotnet/dotnet pack Vosk.csproj -p:NuspecFile=Vosk.nuspec -o .

csharp/nuget/build/Vosk.targets

@@ -0,0 +1,11 @@
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <NativeLibs Include="$(MSBuildThisFileDirectory)\lib\linux-x64\*.so" Condition="'$([MSBuild]::IsOsPlatform(Linux))'" />
+    <NativeLibs Include="$(MSBuildThisFileDirectory)\lib\win-x64\*.dll" Condition="'$([MSBuild]::IsOsPlatform(Windows))'" />
+    <NativeLibs Include="$(MSBuildThisFileDirectory)\lib\osx-universal\*.dylib" Condition="'$([MSBuild]::IsOsPlatform(OSX))'" />
+    <None Include="@(NativeLibs)">
+      <Link>%(FileName)%(Extension)</Link>
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+</Project>

csharp/nuget/src/BatchModel.cs

@@ -0,0 +1,55 @@
+using System;
+
+namespace Vosk
+{
+    public class BatchModel : global::System.IDisposable
+    {
+        private global::System.Runtime.InteropServices.HandleRef handle;
+
+        internal BatchModel(global::System.IntPtr cPtr)
+        {
+            handle = new global::System.Runtime.InteropServices.HandleRef(this, cPtr);
+        }
+
+        internal static global::System.Runtime.InteropServices.HandleRef getCPtr(BatchModel obj)
+        {
+            return (obj == null) ? new global::System.Runtime.InteropServices.HandleRef(null, global::System.IntPtr.Zero) : obj.handle;
+        }
+
+        ~BatchModel()
+        {
+            Dispose(false);
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+            global::System.GC.SuppressFinalize(this);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            lock (this)
+            {
+                if (handle.Handle != global::System.IntPtr.Zero)
+                {
+                    VoskPINVOKE.delete_BatchModel(handle);
+                    handle = new global::System.Runtime.InteropServices.HandleRef(null, global::System.IntPtr.Zero);
+                }
+            }
+        }
+
+        public BatchModel(string model_path) : this(VoskPINVOKE.new_BatchModel(model_path))
+        {
+        }
+
+        public void WaitForCompletion()
+        {
+            if (handle.Handle != global::System.IntPtr.Zero)
+            {
+                VoskPINVOKE.wait_BatchModel(handle);
+            }
+        }
+    }
+
+}

csharp/nuget/src/Model.cs

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+namespace Vosk {
+
+public class Model : global::System.IDisposable {
+  private global::System.Runtime.InteropServices.HandleRef handle;
+
+  internal Model(global::System.IntPtr cPtr) {
+    handle = new global::System.Runtime.InteropServices.HandleRef(this, cPtr);
+  }
+
+  internal static global::System.Runtime.InteropServices.HandleRef getCPtr(Model obj) {
+    return (obj == null) ? new global::System.Runtime.InteropServices.HandleRef(null, global::System.IntPtr.Zero) : obj.handle;
+  }
+
+  ~Model() {
+    Dispose(false);
+  }
+
+  public void Dispose() {
+    Dispose(true);
+    global::System.GC.SuppressFinalize(this);
+  }
+
+  protected virtual void Dispose(bool disposing) {
+    lock(this) {
+      if (handle.Handle != global::System.IntPtr.Zero) {
+        VoskPINVOKE.delete_Model(handle);
+        handle = new global::System.Runtime.InteropServices.HandleRef(null, global::System.IntPtr.Zero);
+      }
+    }
+  }
+
+  public Model(string model_path) : this(VoskPINVOKE.new_Model(model_path)) {
+  }
+
+  public int FindWord(string word) {
+    return VoskPINVOKE.Model_vosk_model_find_word(handle, word);
+  }
+
+}
+
+}

csharp/nuget/src/SpkModel.cs

@@ -0,0 +1,37 @@
+namespace Vosk {
+
+public class SpkModel : global::System.IDisposable {
+  private global::System.Runtime.InteropServices.HandleRef handle;
+
+  internal SpkModel(global::System.IntPtr cPtr) {
+    handle = new global::System.Runtime.InteropServices.HandleRef(this, cPtr);
+  }
+
+  internal static global::System.Runtime.InteropServices.HandleRef getCPtr(SpkModel obj) {
+    return (obj == null) ? new global::System.Runtime.InteropServices.HandleRef(null, global::System.IntPtr.Zero) : obj.handle;
+  }
+
+  ~SpkModel() {
+    Dispose(false);
+  }
+
+  public void Dispose() {
+    Dispose(true);
+    global::System.GC.SuppressFinalize(this);
+  }
+
+  protected virtual void Dispose(bool disposing) {
+    lock(this) {
+      if (handle.Handle != global::System.IntPtr.Zero) {
+        VoskPINVOKE.delete_SpkModel(handle);
+        handle = new global::System.Runtime.InteropServices.HandleRef(null, global::System.IntPtr.Zero);
+      }
+    }
+  }
+
+  public SpkModel(string model_path) : this(VoskPINVOKE.new_SpkModel(model_path)) {
+  }
+
+}
+
+}

csharp/nuget/src/Vosk.cs

@@ -0,0 +1,17 @@
+namespace Vosk {
+
+public class Vosk {
+  public static void SetLogLevel(int level) {
+    VoskPINVOKE.SetLogLevel(level);
+  }
+
+  public static void GpuInit() {
+    VoskPINVOKE.GpuInit();
+  }
+
+  public static void GpuThreadInit() {
+    VoskPINVOKE.GpuThreadInit();
+  }
+}
+
+}

csharp/nuget/src/VoskBatchRecognizer.cs

@@ -0,0 +1,88 @@
+using System;
+
+namespace Vosk
+{
+    public class VoskBatchRecognizer : System.IDisposable
+    {
+        private System.Runtime.InteropServices.HandleRef handle;
+
+        internal VoskBatchRecognizer(System.IntPtr cPtr)
+        {
+            handle = new System.Runtime.InteropServices.HandleRef(this, cPtr);
+        }
+
+        internal static System.Runtime.InteropServices.HandleRef getCPtr(VoskBatchRecognizer obj)
+        {
+            return (obj == null) ? new System.Runtime.InteropServices.HandleRef(null, System.IntPtr.Zero) : obj.handle;
+        }
+
+        ~VoskBatchRecognizer()
+        {
+            Dispose(false);
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+            System.GC.SuppressFinalize(this);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            lock (this)
+            {
+                if (handle.Handle != System.IntPtr.Zero)
+                {
+                    VoskPINVOKE.delete_VoskBatchRecognizer(handle);
+                    handle = new System.Runtime.InteropServices.HandleRef(null, System.IntPtr.Zero);
+                }
+            }
+        }
+
+        public VoskBatchRecognizer(BatchModel model, float sample_rate) : this(VoskPINVOKE.new_VoskBatchRecognizer(BatchModel.getCPtr(model), sample_rate))
+        {
+        }
+
+        public bool AcceptWaveform(byte[] data, int len)
+        {
+            return VoskPINVOKE.VoskBatchRecognizer_AcceptWaveform(handle, data, len);
+        }
+
+        private static string PtrToStringUTF8(System.IntPtr ptr)
+        {
+            int len = 0;
+            while (System.Runtime.InteropServices.Marshal.ReadByte(ptr, len) != 0)
+                len++;
+            byte[] array = new byte[len];
+            System.Runtime.InteropServices.Marshal.Copy(ptr, array, 0, len);
+            return System.Text.Encoding.UTF8.GetString(array);
+        }
+
+        public string FrontResult()
+        {
+            return PtrToStringUTF8(VoskPINVOKE.VoskBatchRecognizer_FrontResult(handle));
+        }
+
+        public string Result()
+        {
+            string result = PtrToStringUTF8(VoskPINVOKE.VoskBatchRecognizer_FrontResult(handle));
+            VoskPINVOKE.VoskBatchRecognizer_Pop(handle);
+            return result;
+        }
+
+        public int GetNumPendingChunks()
+        {
+            return VoskPINVOKE.VoskBatchRecognizer_GetPendingChunks(handle);
+        }
+
+        public void FinishStream()
+        {
+            VoskPINVOKE.VoskBatchRecognizer_FinishStream(handle);
+        }
+
+        public void SetNLSML(bool nlsml)
+        {
+            VoskPINVOKE.VoskBatchRecognizer_SetNLSML(handle, Convert.ToInt32(nlsml));
+        }
+    }
+}

csharp/nuget/src/VoskPINVOKE.cs

@@ -0,0 +1,118 @@
+namespace Vosk {
+
+class VoskPINVOKE {
+
+  static VoskPINVOKE() {
+  }
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_model_new")]
+  public static extern global::System.IntPtr new_Model(string jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_model_free")]
+  public static extern void delete_Model(global::System.Runtime.InteropServices.HandleRef jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_model_find_word")]
+  public static extern int Model_vosk_model_find_word(global::System.Runtime.InteropServices.HandleRef jarg1, string jarg2);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_spk_model_new")]
+  public static extern global::System.IntPtr new_SpkModel(string jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_spk_model_free")]
+  public static extern void delete_SpkModel(global::System.Runtime.InteropServices.HandleRef jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_new")]
+  public static extern global::System.IntPtr new_VoskRecognizer(global::System.Runtime.InteropServices.HandleRef jarg1, float jarg2);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_new_spk")]
+  public static extern global::System.IntPtr new_VoskRecognizerSpk(global::System.Runtime.InteropServices.HandleRef jarg1, float jarg2, global::System.Runtime.InteropServices.HandleRef jarg3);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_new_grm")]
+  public static extern global::System.IntPtr new_VoskRecognizerGrm(global::System.Runtime.InteropServices.HandleRef jarg1, float jarg2, string jarg3);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_free")]
+  public static extern void delete_VoskRecognizer(global::System.Runtime.InteropServices.HandleRef jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_set_max_alternatives")]
+  public static extern void VoskRecognizer_SetMaxAlternatives(global::System.Runtime.InteropServices.HandleRef jarg1, int jarg2);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_set_words")]
+  public static extern void VoskRecognizer_SetWords(global::System.Runtime.InteropServices.HandleRef jarg1, int jarg2);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_set_partial_words")]
+  public static extern void VoskRecognizer_SetPartialWords(global::System.Runtime.InteropServices.HandleRef jarg1, int jarg2);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_set_spk_model")]
+  public static extern void VoskRecognizer_SetSpkModel(global::System.Runtime.InteropServices.HandleRef jarg1, global::System.Runtime.InteropServices.HandleRef jarg2);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_accept_waveform")]
+  public static extern bool VoskRecognizer_AcceptWaveform(global::System.Runtime.InteropServices.HandleRef jarg1, [global::System.Runtime.InteropServices.In, global::System.Runtime.InteropServices.MarshalAs(global::System.Runtime.InteropServices.UnmanagedType.LPArray)]byte[] jarg2, int jarg3);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_accept_waveform_s")]
+  public static extern bool VoskRecognizer_AcceptWaveformShort(global::System.Runtime.InteropServices.HandleRef jarg1, [global::System.Runtime.InteropServices.In, global::System.Runtime.InteropServices.MarshalAs(global::System.Runtime.InteropServices.UnmanagedType.LPArray)]short[] jarg2, int jarg3);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_accept_waveform_f")]
+  public static extern bool VoskRecognizer_AcceptWaveformFloat(global::System.Runtime.InteropServices.HandleRef jarg1, [global::System.Runtime.InteropServices.In, global::System.Runtime.InteropServices.MarshalAs(global::System.Runtime.InteropServices.UnmanagedType.LPArray)]float[] jarg2, int jarg3);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_result")]
+  public static extern global::System.IntPtr VoskRecognizer_Result(global::System.Runtime.InteropServices.HandleRef jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_partial_result")]
+  public static extern global::System.IntPtr VoskRecognizer_PartialResult(global::System.Runtime.InteropServices.HandleRef jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_final_result")]
+  public static extern global::System.IntPtr VoskRecognizer_FinalResult(global::System.Runtime.InteropServices.HandleRef jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_reset")]
+  public static extern void VoskRecognizer_Reset(global::System.Runtime.InteropServices.HandleRef jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_set_endpointer_mode")]
+  public static extern void VoskRecognizer_SetEndpointerMode(global::System.Runtime.InteropServices.HandleRef jarg1, int jarg2);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_recognizer_set_endpointer_delays")]
+  public static extern void VoskRecognizer_SetEndpointerDelays(global::System.Runtime.InteropServices.HandleRef jarg1, float jarg2, float jarg3, float jarg4);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_set_log_level")]
+  public static extern void SetLogLevel(int jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_gpu_init")]
+  public static extern void GpuInit();
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint="vosk_gpu_thread_init")]
+  public static extern void GpuThreadInit();
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint = "vosk_batch_model_new")]
+  public static extern global::System.IntPtr new_BatchModel(string jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint = "vosk_batch_model_free")]
+  public static extern void delete_BatchModel(global::System.Runtime.InteropServices.HandleRef jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint = "vosk_batch_model_wait")]
+  public static extern void wait_BatchModel(global::System.Runtime.InteropServices.HandleRef jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint = "vosk_batch_recognizer_new")]
+  public static extern global::System.IntPtr new_VoskBatchRecognizer(global::System.Runtime.InteropServices.HandleRef jarg1, float jarg2);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint = "vosk_batch_recognizer_free")]
+  public static extern void delete_VoskBatchRecognizer(global::System.Runtime.InteropServices.HandleRef jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint = "vosk_batch_recognizer_accept_waveform")]
+  public static extern bool VoskBatchRecognizer_AcceptWaveform(global::System.Runtime.InteropServices.HandleRef jarg1, [global::System.Runtime.InteropServices.In, global::System.Runtime.InteropServices.MarshalAs(global::System.Runtime.InteropServices.UnmanagedType.LPArray)] byte[] jarg2, int jarg3);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint = "vosk_batch_recognizer_set_nlsml")]
+  public static extern void VoskBatchRecognizer_SetNLSML(global::System.Runtime.InteropServices.HandleRef jarg1, int jarg2);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint = "vosk_batch_recognizer_finish_stream")]
+  public static extern void VoskBatchRecognizer_FinishStream(global::System.Runtime.InteropServices.HandleRef jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint = "vosk_batch_recognizer_front_result")]
+  public static extern global::System.IntPtr VoskBatchRecognizer_FrontResult(global::System.Runtime.InteropServices.HandleRef jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint = "vosk_batch_recognizer_pop")]
+  public static extern void VoskBatchRecognizer_Pop(global::System.Runtime.InteropServices.HandleRef jarg1);
+
+  [global::System.Runtime.InteropServices.DllImport("libvosk", EntryPoint = "vosk_batch_recognizer_get_pending_chunks")]
+  public static extern int VoskBatchRecognizer_GetPendingChunks(global::System.Runtime.InteropServices.HandleRef jarg1);
+
+}
+
+}

csharp/nuget/src/VoskRecognizer.cs

@@ -0,0 +1,111 @@
+namespace Vosk {
+
+public enum EndpointerMode {
+    DEFAULT = 0,
+    SHORT = 1,
+    LONG = 2,
+    VERY_LONG = 3
+}
+
+public class VoskRecognizer : System.IDisposable {
+  private System.Runtime.InteropServices.HandleRef handle;
+
+  internal VoskRecognizer(System.IntPtr cPtr) {
+    handle = new System.Runtime.InteropServices.HandleRef(this, cPtr);
+  }
+
+  internal static System.Runtime.InteropServices.HandleRef getCPtr(VoskRecognizer obj) {
+    return (obj == null) ? new System.Runtime.InteropServices.HandleRef(null, System.IntPtr.Zero) : obj.handle;
+  }
+
+  ~VoskRecognizer() {
+    Dispose(false);
+  }
+
+  public void Dispose() {
+    Dispose(true);
+    System.GC.SuppressFinalize(this);
+  }
+
+  protected virtual void Dispose(bool disposing) {
+    lock(this) {
+      if (handle.Handle != System.IntPtr.Zero) {
+        VoskPINVOKE.delete_VoskRecognizer(handle);
+        handle = new System.Runtime.InteropServices.HandleRef(null, System.IntPtr.Zero);
+      }
+    }
+  }
+
+  public VoskRecognizer(Model model, float sample_rate) : this(VoskPINVOKE.new_VoskRecognizer(Model.getCPtr(model), sample_rate)) {
+  }
+
+  public VoskRecognizer(Model model, float sample_rate, SpkModel spk_model) : this(VoskPINVOKE.new_VoskRecognizerSpk(Model.getCPtr(model), sample_rate, SpkModel.getCPtr(spk_model))) {
+  }
+
+  public VoskRecognizer(Model model, float sample_rate, string grammar) : this(VoskPINVOKE.new_VoskRecognizerGrm(Model.getCPtr(model), sample_rate, grammar)) {
+  }
+
+  public void SetMaxAlternatives(int max_alternatives) {
+    VoskPINVOKE.VoskRecognizer_SetMaxAlternatives(handle, max_alternatives);
+  }
+
+  public void SetWords(bool words) {
+    VoskPINVOKE.VoskRecognizer_SetWords(handle, words ? 1 : 0);
+  }
+
+  public void SetPartialWords(bool partial_words) {
+    VoskPINVOKE.VoskRecognizer_SetPartialWords(handle, partial_words ? 1 : 0);
+  }
+
+  public void SetSpkModel(SpkModel spk_model) {
+    VoskPINVOKE.VoskRecognizer_SetSpkModel(handle, SpkModel.getCPtr(spk_model));
+  }
+
+  public bool AcceptWaveform(byte[] data, int len) {
+    return VoskPINVOKE.VoskRecognizer_AcceptWaveform(handle, data, len);
+  }
+
+  public bool AcceptWaveform(short[] sdata, int len) {
+    return VoskPINVOKE.VoskRecognizer_AcceptWaveformShort(handle, sdata, len);
+  }
+
+  public bool AcceptWaveform(float[] fdata, int len) {
+    return VoskPINVOKE.VoskRecognizer_AcceptWaveformFloat(handle, fdata, len);
+  }
+
+  private static string PtrToStringUTF8(System.IntPtr ptr) {
+    int len = 0;
+    while (System.Runtime.InteropServices.Marshal.ReadByte(ptr, len) != 0)
+        len++;
+    byte[] array = new byte[len];
+    System.Runtime.InteropServices.Marshal.Copy(ptr, array, 0, len);
+    return System.Text.Encoding.UTF8.GetString(array);
+  }
+
+  public string Result() {
+    return PtrToStringUTF8(VoskPINVOKE.VoskRecognizer_Result(handle));
+  }
+
+  public string PartialResult() {
+    return PtrToStringUTF8(VoskPINVOKE.VoskRecognizer_PartialResult(handle));
+  }
+
+  public string FinalResult() {
+    return PtrToStringUTF8(VoskPINVOKE.VoskRecognizer_FinalResult(handle));
+  }
+
+  public void Reset() {
+    VoskPINVOKE.VoskRecognizer_Reset(handle);
+  }
+
+  public void SetEndpointerMode(EndpointerMode mode) {
+    VoskPINVOKE.VoskRecognizer_SetEndpointerMode(handle, (int) mode);
+  }
+
+  public void SetEndpointerDelays(float t_start_max, float t_end, float t_max) {
+    VoskPINVOKE.VoskRecognizer_SetEndpointerDelays(handle, t_start_max, t_end, t_max);
+  }
+
+}
+
+}