Expose and use model sample rate in .NET

native_client/dotnet/DeepSpeechClient/DeepSpeech.cs

@@ -64,6 +64,15 @@ namespace DeepSpeechClient
             EvaluateResultCode(resultCode);
         }
 
+        /// <summary>
+        /// Return the sample rate expected by the model.
+        /// </summary>
+        /// <returns>Sample rate.</returns>
+        public unsafe int GetModelSampleRate()
+        {
+            return NativeImp.DS_GetModelSampleRate(_modelStatePP);
+        }
+
         /// <summary>
         /// Evaluate the result code and will raise an exception if necessary.
         /// </summary>

native_client/dotnet/DeepSpeechClient/Interfaces/IDeepSpeech.cs

@@ -24,6 +24,12 @@ namespace DeepSpeechClient.Interfaces
                    string aAlphabetConfigPath,
                    uint aBeamWidth);
 
+        /// <summary>
+        /// Return the sample rate expected by the model.
+        /// </summary>
+        /// <returns>Sample rate.</returns>
+        unsafe int GetModelSampleRate();
+
         /// <summary>
         /// Enable decoding using beam scoring with a KenLM language model.
         /// </summary>

native_client/dotnet/DeepSpeechClient/NativeImp.cs

@@ -20,6 +20,9 @@ namespace DeepSpeechClient
                    uint aBeamWidth,
                    ref IntPtr** pint);
 
+        [DllImport("libdeepspeech.so", CallingConvention = CallingConvention.Cdecl)]
+        internal unsafe static extern int DS_GetModelSampleRate(IntPtr** aCtx);
+
         [DllImport("libdeepspeech.so", CallingConvention = CallingConvention.Cdecl)]
         internal static unsafe extern ErrorCodes DS_EnableDecoderWithLM(IntPtr** aCtx,
                   string aLMPath,