diff --git a/apis/Google.Cloud.TextToSpeech.V1Beta1/Google.Cloud.TextToSpeech.V1Beta1/CloudTts.g.cs b/apis/Google.Cloud.TextToSpeech.V1Beta1/Google.Cloud.TextToSpeech.V1Beta1/CloudTts.g.cs
index 7f3bd20d46cf..0c2fc5ee2c42 100644
--- a/apis/Google.Cloud.TextToSpeech.V1Beta1/Google.Cloud.TextToSpeech.V1Beta1/CloudTts.g.cs
+++ b/apis/Google.Cloud.TextToSpeech.V1Beta1/Google.Cloud.TextToSpeech.V1Beta1/CloudTts.g.cs
@@ -92,43 +92,48 @@ static CloudTtsReflection() {
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+            "bG9jYXRpb25zL3tsb2NhdGlvbn0vbW9kZWxzL3ttb2RlbH1iBnByb3RvMw=="));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { global::Google.Api.AnnotationsReflection.Descriptor, global::Google.Api.ClientReflection.Descriptor, global::Google.Api.FieldBehaviorReflection.Descriptor, global::Google.Api.ResourceReflection.Descriptor, },
           new pbr::GeneratedClrTypeInfo(new[] {typeof(global::Google.Cloud.TextToSpeech.V1Beta1.SsmlVoiceGender), typeof(global::Google.Cloud.TextToSpeech.V1Beta1.AudioEncoding), }, null, new pbr::GeneratedClrTypeInfo[] {
@@ -147,7 +152,8 @@ static CloudTtsReflection() {
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.TextToSpeech.V1Beta1.VoiceCloneParams), global::Google.Cloud.TextToSpeech.V1Beta1.VoiceCloneParams.Parser, new[]{ "VoiceCloningKey" }, null, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.TextToSpeech.V1Beta1.SynthesizeSpeechResponse), global::Google.Cloud.TextToSpeech.V1Beta1.SynthesizeSpeechResponse.Parser, new[]{ "AudioContent", "Timepoints", "AudioConfig" }, null, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.TextToSpeech.V1Beta1.Timepoint), global::Google.Cloud.TextToSpeech.V1Beta1.Timepoint.Parser, new[]{ "MarkName", "TimeSeconds" }, null, null, null, null),
-            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.TextToSpeech.V1Beta1.StreamingSynthesizeConfig), global::Google.Cloud.TextToSpeech.V1Beta1.StreamingSynthesizeConfig.Parser, new[]{ "Voice" }, null, null, null, null),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.TextToSpeech.V1Beta1.StreamingAudioConfig), global::Google.Cloud.TextToSpeech.V1Beta1.StreamingAudioConfig.Parser, new[]{ "AudioEncoding", "SampleRateHertz" }, null, null, null, null),
+            new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.TextToSpeech.V1Beta1.StreamingSynthesizeConfig), global::Google.Cloud.TextToSpeech.V1Beta1.StreamingSynthesizeConfig.Parser, new[]{ "Voice", "StreamingAudioConfig" }, null, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.TextToSpeech.V1Beta1.StreamingSynthesisInput), global::Google.Cloud.TextToSpeech.V1Beta1.StreamingSynthesisInput.Parser, new[]{ "Text" }, new[]{ "InputSource" }, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.TextToSpeech.V1Beta1.StreamingSynthesizeRequest), global::Google.Cloud.TextToSpeech.V1Beta1.StreamingSynthesizeRequest.Parser, new[]{ "StreamingConfig", "Input" }, new[]{ "StreamingRequest" }, null, null, null),
             new pbr::GeneratedClrTypeInfo(typeof(global::Google.Cloud.TextToSpeech.V1Beta1.StreamingSynthesizeResponse), global::Google.Cloud.TextToSpeech.V1Beta1.StreamingSynthesizeResponse.Parser, new[]{ "AudioContent" }, null, null, null, null)
@@ -224,6 +230,12 @@ public enum AudioEncoding {
     /// Audio content returned as ALAW also contains a WAV header.
     /// </summary>
     [pbr::OriginalName("ALAW")] Alaw = 6,
+    /// <summary>
+    /// Uncompressed 16-bit signed little-endian samples (Linear PCM).
+    /// Note that as opposed to LINEAR16, audio will not be wrapped in a WAV (or
+    /// any other) header.
+    /// </summary>
+    [pbr::OriginalName("PCM")] Pcm = 7,
   }
 
   #endregion
@@ -4712,6 +4724,244 @@ public void MergeFrom(pb::CodedInputStream input) {
 
   }
 
+  /// <summary>
+  /// Description of the desired output audio data.
+  /// </summary>
+  [global::System.Diagnostics.DebuggerDisplayAttribute("{ToString(),nq}")]
+  public sealed partial class StreamingAudioConfig : pb::IMessage<StreamingAudioConfig>
+  #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+      , pb::IBufferMessage
+  #endif
+  {
+    private static readonly pb::MessageParser<StreamingAudioConfig> _parser = new pb::MessageParser<StreamingAudioConfig>(() => new StreamingAudioConfig());
+    private pb::UnknownFieldSet _unknownFields;
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public static pb::MessageParser<StreamingAudioConfig> Parser { get { return _parser; } }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public static pbr::MessageDescriptor Descriptor {
+      get { return global::Google.Cloud.TextToSpeech.V1Beta1.CloudTtsReflection.Descriptor.MessageTypes[15]; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public StreamingAudioConfig() {
+      OnConstruction();
+    }
+
+    partial void OnConstruction();
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public StreamingAudioConfig(StreamingAudioConfig other) : this() {
+      audioEncoding_ = other.audioEncoding_;
+      sampleRateHertz_ = other.sampleRateHertz_;
+      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public StreamingAudioConfig Clone() {
+      return new StreamingAudioConfig(this);
+    }
+
+    /// <summary>Field number for the "audio_encoding" field.</summary>
+    public const int AudioEncodingFieldNumber = 1;
+    private global::Google.Cloud.TextToSpeech.V1Beta1.AudioEncoding audioEncoding_ = global::Google.Cloud.TextToSpeech.V1Beta1.AudioEncoding.Unspecified;
+    /// <summary>
+    /// Required. The format of the audio byte stream.
+    /// For now, streaming only supports PCM and OGG_OPUS. All other encodings
+    /// will return an error.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public global::Google.Cloud.TextToSpeech.V1Beta1.AudioEncoding AudioEncoding {
+      get { return audioEncoding_; }
+      set {
+        audioEncoding_ = value;
+      }
+    }
+
+    /// <summary>Field number for the "sample_rate_hertz" field.</summary>
+    public const int SampleRateHertzFieldNumber = 2;
+    private int sampleRateHertz_;
+    /// <summary>
+    /// Optional. The synthesis sample rate (in hertz) for this audio.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public int SampleRateHertz {
+      get { return sampleRateHertz_; }
+      set {
+        sampleRateHertz_ = value;
+      }
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public override bool Equals(object other) {
+      return Equals(other as StreamingAudioConfig);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public bool Equals(StreamingAudioConfig other) {
+      if (ReferenceEquals(other, null)) {
+        return false;
+      }
+      if (ReferenceEquals(other, this)) {
+        return true;
+      }
+      if (AudioEncoding != other.AudioEncoding) return false;
+      if (SampleRateHertz != other.SampleRateHertz) return false;
+      return Equals(_unknownFields, other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public override int GetHashCode() {
+      int hash = 1;
+      if (AudioEncoding != global::Google.Cloud.TextToSpeech.V1Beta1.AudioEncoding.Unspecified) hash ^= AudioEncoding.GetHashCode();
+      if (SampleRateHertz != 0) hash ^= SampleRateHertz.GetHashCode();
+      if (_unknownFields != null) {
+        hash ^= _unknownFields.GetHashCode();
+      }
+      return hash;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public override string ToString() {
+      return pb::JsonFormatter.ToDiagnosticString(this);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public void WriteTo(pb::CodedOutputStream output) {
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+      output.WriteRawMessage(this);
+    #else
+      if (AudioEncoding != global::Google.Cloud.TextToSpeech.V1Beta1.AudioEncoding.Unspecified) {
+        output.WriteRawTag(8);
+        output.WriteEnum((int) AudioEncoding);
+      }
+      if (SampleRateHertz != 0) {
+        output.WriteRawTag(16);
+        output.WriteInt32(SampleRateHertz);
+      }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(output);
+      }
+    #endif
+    }
+
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    void pb::IBufferMessage.InternalWriteTo(ref pb::WriteContext output) {
+      if (AudioEncoding != global::Google.Cloud.TextToSpeech.V1Beta1.AudioEncoding.Unspecified) {
+        output.WriteRawTag(8);
+        output.WriteEnum((int) AudioEncoding);
+      }
+      if (SampleRateHertz != 0) {
+        output.WriteRawTag(16);
+        output.WriteInt32(SampleRateHertz);
+      }
+      if (_unknownFields != null) {
+        _unknownFields.WriteTo(ref output);
+      }
+    }
+    #endif
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public int CalculateSize() {
+      int size = 0;
+      if (AudioEncoding != global::Google.Cloud.TextToSpeech.V1Beta1.AudioEncoding.Unspecified) {
+        size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) AudioEncoding);
+      }
+      if (SampleRateHertz != 0) {
+        size += 1 + pb::CodedOutputStream.ComputeInt32Size(SampleRateHertz);
+      }
+      if (_unknownFields != null) {
+        size += _unknownFields.CalculateSize();
+      }
+      return size;
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public void MergeFrom(StreamingAudioConfig other) {
+      if (other == null) {
+        return;
+      }
+      if (other.AudioEncoding != global::Google.Cloud.TextToSpeech.V1Beta1.AudioEncoding.Unspecified) {
+        AudioEncoding = other.AudioEncoding;
+      }
+      if (other.SampleRateHertz != 0) {
+        SampleRateHertz = other.SampleRateHertz;
+      }
+      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public void MergeFrom(pb::CodedInputStream input) {
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+      input.ReadRawMessage(this);
+    #else
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, input);
+            break;
+          case 8: {
+            AudioEncoding = (global::Google.Cloud.TextToSpeech.V1Beta1.AudioEncoding) input.ReadEnum();
+            break;
+          }
+          case 16: {
+            SampleRateHertz = input.ReadInt32();
+            break;
+          }
+        }
+      }
+    #endif
+    }
+
+    #if !GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    void pb::IBufferMessage.InternalMergeFrom(ref pb::ParseContext input) {
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            _unknownFields = pb::UnknownFieldSet.MergeFieldFrom(_unknownFields, ref input);
+            break;
+          case 8: {
+            AudioEncoding = (global::Google.Cloud.TextToSpeech.V1Beta1.AudioEncoding) input.ReadEnum();
+            break;
+          }
+          case 16: {
+            SampleRateHertz = input.ReadInt32();
+            break;
+          }
+        }
+      }
+    }
+    #endif
+
+  }
+
   /// <summary>
   /// Provides configuration information for the StreamingSynthesize request.
   /// </summary>
@@ -4730,7 +4980,7 @@ public sealed partial class StreamingSynthesizeConfig : pb::IMessage<StreamingSy
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Cloud.TextToSpeech.V1Beta1.CloudTtsReflection.Descriptor.MessageTypes[15]; }
+      get { return global::Google.Cloud.TextToSpeech.V1Beta1.CloudTtsReflection.Descriptor.MessageTypes[16]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -4751,6 +5001,7 @@ public StreamingSynthesizeConfig() {
     [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
     public StreamingSynthesizeConfig(StreamingSynthesizeConfig other) : this() {
       voice_ = other.voice_ != null ? other.voice_.Clone() : null;
+      streamingAudioConfig_ = other.streamingAudioConfig_ != null ? other.streamingAudioConfig_.Clone() : null;
       _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
     }
 
@@ -4775,6 +5026,21 @@ public StreamingSynthesizeConfig Clone() {
       }
     }
 
+    /// <summary>Field number for the "streaming_audio_config" field.</summary>
+    public const int StreamingAudioConfigFieldNumber = 4;
+    private global::Google.Cloud.TextToSpeech.V1Beta1.StreamingAudioConfig streamingAudioConfig_;
+    /// <summary>
+    /// Optional. The configuration of the synthesized audio.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public global::Google.Cloud.TextToSpeech.V1Beta1.StreamingAudioConfig StreamingAudioConfig {
+      get { return streamingAudioConfig_; }
+      set {
+        streamingAudioConfig_ = value;
+      }
+    }
+
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
     public override bool Equals(object other) {
@@ -4791,6 +5057,7 @@ public bool Equals(StreamingSynthesizeConfig other) {
         return true;
       }
       if (!object.Equals(Voice, other.Voice)) return false;
+      if (!object.Equals(StreamingAudioConfig, other.StreamingAudioConfig)) return false;
       return Equals(_unknownFields, other._unknownFields);
     }
 
@@ -4799,6 +5066,7 @@ public bool Equals(StreamingSynthesizeConfig other) {
     public override int GetHashCode() {
       int hash = 1;
       if (voice_ != null) hash ^= Voice.GetHashCode();
+      if (streamingAudioConfig_ != null) hash ^= StreamingAudioConfig.GetHashCode();
       if (_unknownFields != null) {
         hash ^= _unknownFields.GetHashCode();
       }
@@ -4821,6 +5089,10 @@ public void WriteTo(pb::CodedOutputStream output) {
         output.WriteRawTag(10);
         output.WriteMessage(Voice);
       }
+      if (streamingAudioConfig_ != null) {
+        output.WriteRawTag(34);
+        output.WriteMessage(StreamingAudioConfig);
+      }
       if (_unknownFields != null) {
         _unknownFields.WriteTo(output);
       }
@@ -4835,6 +5107,10 @@ public void WriteTo(pb::CodedOutputStream output) {
         output.WriteRawTag(10);
         output.WriteMessage(Voice);
       }
+      if (streamingAudioConfig_ != null) {
+        output.WriteRawTag(34);
+        output.WriteMessage(StreamingAudioConfig);
+      }
       if (_unknownFields != null) {
         _unknownFields.WriteTo(ref output);
       }
@@ -4848,6 +5124,9 @@ public int CalculateSize() {
       if (voice_ != null) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(Voice);
       }
+      if (streamingAudioConfig_ != null) {
+        size += 1 + pb::CodedOutputStream.ComputeMessageSize(StreamingAudioConfig);
+      }
       if (_unknownFields != null) {
         size += _unknownFields.CalculateSize();
       }
@@ -4866,6 +5145,12 @@ public void MergeFrom(StreamingSynthesizeConfig other) {
         }
         Voice.MergeFrom(other.Voice);
       }
+      if (other.streamingAudioConfig_ != null) {
+        if (streamingAudioConfig_ == null) {
+          StreamingAudioConfig = new global::Google.Cloud.TextToSpeech.V1Beta1.StreamingAudioConfig();
+        }
+        StreamingAudioConfig.MergeFrom(other.StreamingAudioConfig);
+      }
       _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
     }
 
@@ -4888,6 +5173,13 @@ public void MergeFrom(pb::CodedInputStream input) {
             input.ReadMessage(Voice);
             break;
           }
+          case 34: {
+            if (streamingAudioConfig_ == null) {
+              StreamingAudioConfig = new global::Google.Cloud.TextToSpeech.V1Beta1.StreamingAudioConfig();
+            }
+            input.ReadMessage(StreamingAudioConfig);
+            break;
+          }
         }
       }
     #endif
@@ -4910,6 +5202,13 @@ public void MergeFrom(pb::CodedInputStream input) {
             input.ReadMessage(Voice);
             break;
           }
+          case 34: {
+            if (streamingAudioConfig_ == null) {
+              StreamingAudioConfig = new global::Google.Cloud.TextToSpeech.V1Beta1.StreamingAudioConfig();
+            }
+            input.ReadMessage(StreamingAudioConfig);
+            break;
+          }
         }
       }
     }
@@ -4935,7 +5234,7 @@ public sealed partial class StreamingSynthesisInput : pb::IMessage<StreamingSynt
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Cloud.TextToSpeech.V1Beta1.CloudTtsReflection.Descriptor.MessageTypes[16]; }
+      get { return global::Google.Cloud.TextToSpeech.V1Beta1.CloudTtsReflection.Descriptor.MessageTypes[17]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5182,7 +5481,7 @@ public sealed partial class StreamingSynthesizeRequest : pb::IMessage<StreamingS
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Cloud.TextToSpeech.V1Beta1.CloudTtsReflection.Descriptor.MessageTypes[17]; }
+      get { return global::Google.Cloud.TextToSpeech.V1Beta1.CloudTtsReflection.Descriptor.MessageTypes[18]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
@@ -5481,7 +5780,7 @@ public sealed partial class StreamingSynthesizeResponse : pb::IMessage<Streaming
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
     [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
     public static pbr::MessageDescriptor Descriptor {
-      get { return global::Google.Cloud.TextToSpeech.V1Beta1.CloudTtsReflection.Descriptor.MessageTypes[18]; }
+      get { return global::Google.Cloud.TextToSpeech.V1Beta1.CloudTtsReflection.Descriptor.MessageTypes[19]; }
     }
 
     [global::System.Diagnostics.DebuggerNonUserCodeAttribute]