120 lines
4.0 KiB
C#
120 lines
4.0 KiB
C#
/// Copyright (c) 2024 Xiaomi Corporation (authors: Fangjun Kuang)
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using System;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace SherpaOnnx
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{
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// please see
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// https://www.mono-project.com/docs/advanced/pinvoke/#gc-safe-pinvoke-code
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// https://www.mono-project.com/docs/advanced/pinvoke/#properly-disposing-of-resources
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public class KeywordSpotter : IDisposable
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{
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public KeywordSpotter(KeywordSpotterConfig config)
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{
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IntPtr h = CreateKeywordSpotter(ref config);
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_handle = new HandleRef(this, h);
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}
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public OnlineStream CreateStream()
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{
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IntPtr p = CreateKeywordStream(_handle.Handle);
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return new OnlineStream(p);
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}
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public OnlineStream CreateStream(string keywords)
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{
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byte[] utf8Bytes = Encoding.UTF8.GetBytes(keywords);
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IntPtr p = CreateKeywordStreamWithKeywords(_handle.Handle, utf8Bytes);
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return new OnlineStream(p);
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}
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/// Return true if the passed stream is ready for decoding.
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public bool IsReady(OnlineStream stream)
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{
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return IsReady(_handle.Handle, stream.Handle) != 0;
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}
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/// You have to ensure that IsReady(stream) returns true before
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/// you call this method
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public void Decode(OnlineStream stream)
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{
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Decode(_handle.Handle, stream.Handle);
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}
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// The caller should ensure all passed streams are ready for decoding.
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public void Decode(IEnumerable<OnlineStream> streams)
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{
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// TargetFramework=net20 does not support System.Linq
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// IntPtr[] ptrs = streams.Select(s => s.Handle).ToArray();
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List<IntPtr> list = new List<IntPtr>();
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foreach (OnlineStream s in streams)
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{
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list.Add(s.Handle);
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}
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IntPtr[] ptrs = list.ToArray();
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Decode(_handle.Handle, ptrs, ptrs.Length);
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}
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public KeywordResult GetResult(OnlineStream stream)
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{
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IntPtr h = GetResult(_handle.Handle, stream.Handle);
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KeywordResult result = new KeywordResult(h);
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DestroyResult(h);
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return result;
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}
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public void Dispose()
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{
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Cleanup();
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// Prevent the object from being placed on the
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// finalization queue
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System.GC.SuppressFinalize(this);
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}
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~KeywordSpotter()
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{
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Cleanup();
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}
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private void Cleanup()
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{
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DestroyKeywordSpotter(_handle.Handle);
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// Don't permit the handle to be used again.
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_handle = new HandleRef(this, IntPtr.Zero);
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}
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private HandleRef _handle;
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[DllImport(Dll.Filename)]
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private static extern IntPtr CreateKeywordSpotter(ref KeywordSpotterConfig config);
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[DllImport(Dll.Filename)]
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private static extern void DestroyKeywordSpotter(IntPtr handle);
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[DllImport(Dll.Filename)]
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private static extern IntPtr CreateKeywordStream(IntPtr handle);
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[DllImport(Dll.Filename)]
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private static extern IntPtr CreateKeywordStreamWithKeywords(IntPtr handle, [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.I1)] byte[] utf8Keywords);
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[DllImport(Dll.Filename, EntryPoint = "IsKeywordStreamReady")]
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private static extern int IsReady(IntPtr handle, IntPtr stream);
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[DllImport(Dll.Filename, EntryPoint = "DecodeKeywordStream")]
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private static extern void Decode(IntPtr handle, IntPtr stream);
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[DllImport(Dll.Filename, EntryPoint = "DecodeMultipleKeywordStreams")]
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private static extern void Decode(IntPtr handle, IntPtr[] streams, int n);
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[DllImport(Dll.Filename, EntryPoint = "GetKeywordResult")]
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private static extern IntPtr GetResult(IntPtr handle, IntPtr stream);
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[DllImport(Dll.Filename, EntryPoint = "DestroyKeywordResult")]
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private static extern void DestroyResult(IntPtr result);
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}
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}
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