add response modality

Author: VinayGuthal

firebase-vertexai/api.txt

@@ -600,7 +600,7 @@ package com.google.firebase.vertexai.type {
     method public com.google.firebase.vertexai.type.LiveGenerationConfig.Builder setFrequencyPenalty(Float? frequencyPenalty);
     method public com.google.firebase.vertexai.type.LiveGenerationConfig.Builder setMaxOutputTokens(Integer? maxOutputTokens);
     method public com.google.firebase.vertexai.type.LiveGenerationConfig.Builder setPresencePenalty(Float? presencePenalty);
-    method public com.google.firebase.vertexai.type.LiveGenerationConfig.Builder setResponseModalities(com.google.firebase.vertexai.type.ContentModality? responseModalities);
+    method public com.google.firebase.vertexai.type.LiveGenerationConfig.Builder setResponseModalities(com.google.firebase.vertexai.type.ResponseModality? responseModalities);
     method public com.google.firebase.vertexai.type.LiveGenerationConfig.Builder setSpeechConfig(com.google.firebase.vertexai.type.SpeechConfig? speechConfig);
     method public com.google.firebase.vertexai.type.LiveGenerationConfig.Builder setTemperature(Float? temperature);
     method public com.google.firebase.vertexai.type.LiveGenerationConfig.Builder setTopK(Integer? topK);
@@ -609,7 +609,7 @@ package com.google.firebase.vertexai.type {
     field public Float? frequencyPenalty;
     field public Integer? maxOutputTokens;
     field public Float? presencePenalty;
-    field public com.google.firebase.vertexai.type.ContentModality? responseModality;
+    field public com.google.firebase.vertexai.type.ResponseModality? responseModality;
     field public com.google.firebase.vertexai.type.SpeechConfig? speechConfig;
     field public Float? temperature;
     field public Integer? topK;
@@ -692,6 +692,19 @@ package com.google.firebase.vertexai.type {
   public final class RequestTimeoutException extends com.google.firebase.vertexai.type.FirebaseVertexAIException {
   }
 
+  public final class ResponseModality {
+    method public int getOrdinal();
+    property public final int ordinal;
+    field public static final com.google.firebase.vertexai.type.ResponseModality AUDIO;
+    field public static final com.google.firebase.vertexai.type.ResponseModality.Companion Companion;
+    field public static final com.google.firebase.vertexai.type.ResponseModality IMAGE;
+    field public static final com.google.firebase.vertexai.type.ResponseModality TEXT;
+    field public static final com.google.firebase.vertexai.type.ResponseModality UNSPECIFIED;
+  }
+
+  public static final class ResponseModality.Companion {
+  }
+
   public final class ResponseStoppedException extends com.google.firebase.vertexai.type.FirebaseVertexAIException {
     method public com.google.firebase.vertexai.type.GenerateContentResponse getResponse();
     property public final com.google.firebase.vertexai.type.GenerateContentResponse response;

firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/LiveGenerationConfig.kt

@@ -73,7 +73,7 @@ private constructor(
   internal val maxOutputTokens: Int?,
   internal val presencePenalty: Float?,
   internal val frequencyPenalty: Float?,
-  internal val responseModality: ContentModality?,
+  internal val responseModality: ResponseModality?,
   internal val speechConfig: SpeechConfig?
 ) {
 
@@ -109,7 +109,7 @@ private constructor(
     @JvmField public var maxOutputTokens: Int? = null
     @JvmField public var presencePenalty: Float? = null
     @JvmField public var frequencyPenalty: Float? = null
-    @JvmField public var responseModality: ContentModality? = null
+    @JvmField public var responseModality: ResponseModality? = null
     @JvmField public var speechConfig: SpeechConfig? = null
 
     public fun setTemperature(temperature: Float?): Builder = apply {
@@ -129,7 +129,7 @@ private constructor(
     public fun setFrequencyPenalty(frequencyPenalty: Float?): Builder = apply {
       this.frequencyPenalty = frequencyPenalty
     }
-    public fun setResponseModalities(responseModalities: ContentModality?): Builder = apply {
+    public fun setResponseModalities(responseModalities: ResponseModality?): Builder = apply {
       this.responseModality = responseModalities
     }
     public fun setSpeechConfig(speechConfig: SpeechConfig?): Builder = apply {

firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/ResponseModality.kt

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.firebase.vertexai.type
+
+import com.google.firebase.vertexai.common.util.FirstOrdinalSerializer
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+/** Modality for bidirectional streaming. */
+public class ResponseModality private constructor(public val ordinal: Int) {
+
+  @Serializable(Internal.Serializer::class)
+  internal enum class Internal {
+    @SerialName("MODALITY_UNSPECIFIED") UNSPECIFIED,
+    TEXT,
+    IMAGE,
+    AUDIO;
+
+    internal object Serializer : KSerializer<Internal> by FirstOrdinalSerializer(Internal::class)
+
+    internal fun toPublic() =
+      when (this) {
+        TEXT -> ResponseModality.TEXT
+        IMAGE -> ResponseModality.IMAGE
+        AUDIO -> ResponseModality.AUDIO
+        else -> ResponseModality.UNSPECIFIED
+      }
+  }
+
+  internal fun toInternal() =
+    when (this) {
+      TEXT -> "TEXT"
+      IMAGE -> "IMAGE"
+      AUDIO -> "AUDIO"
+      else -> "UNSPECIFIED"
+    }
+  public companion object {
+    /** Unspecified modality. */
+    @JvmField public val UNSPECIFIED: ResponseModality = ResponseModality(0)
+
+    /** Plain text. */
+    @JvmField public val TEXT: ResponseModality = ResponseModality(1)
+
+    /** Image. */
+    @JvmField public val IMAGE: ResponseModality = ResponseModality(2)
+
+    /** Audio. */
+    @JvmField public val AUDIO: ResponseModality = ResponseModality(4)
+  }
+}