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Add live audio single-agent support and tutorial for inputAudioTranscription
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Lines changed: 276 additions & 4 deletions

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‎core/src/main/java/com/google/adk/runner/Runner.java‎

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@@ -397,9 +397,7 @@ private void copySessionStates(Session source, Session target) {
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private InvocationContext newInvocationContextForLive(
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Session session, Optional<LiveRequestQueue> liveRequestQueue, RunConfig runConfig) {
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RunConfig.Builder runConfigBuilder = RunConfig.builder(runConfig);
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if (liveRequestQueue.isPresent() && !this.agent.subAgents().isEmpty()) {
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// Parity with Python: apply modality defaults and transcription settings
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// only for multi-agent live scenarios.
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if (liveRequestQueue.isPresent()) {
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// Default to AUDIO modality if not specified.
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if (CollectionUtils.isNullOrEmpty(runConfig.responseModalities())) {
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runConfigBuilder.setResponseModalities(

‎core/src/test/java/com/google/adk/runner/InputAudioTranscriptionTest.java‎

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@@ -86,7 +86,7 @@ public void newInvocationContextForLive_multiAgent_autoConfiguresInputAudioTrans
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}
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@Test
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public void newInvocationContextForLive_explicitConfig_preservesUserInputAudioTranscription()
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public void newInvocationContextForLive_multiAgent_preservesUserInputAudioTranscription()
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throws Exception {
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TestLlm testLlm = createTestLlm(createLlmResponse(createContent("response")));
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LlmAgent subAgent = createTestAgentBuilder(testLlm).name("sub_agent").build();
@@ -113,4 +113,54 @@ public void newInvocationContextForLive_explicitConfig_preservesUserInputAudioTr
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assertThat(context.runConfig().inputAudioTranscription()).isSameInstanceAs(userConfig);
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}
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@Test
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public void newInvocationContextForLive_singleAgent_autoConfiguresInputAudioTranscription()
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throws Exception {
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TestLlm testLlm = createTestLlm(createLlmResponse(createContent("response")));
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// Single agent with NO sub-agents
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LlmAgent singleAgent = createTestAgentBuilder(testLlm).name("weather_agent").build();
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Runner runner = new InMemoryRunner(singleAgent, "test", ImmutableList.of());
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Session session = runner.sessionService().createSession("test", "user").blockingGet();
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RunConfig initialConfig =
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RunConfig.builder()
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.setResponseModalities(ImmutableList.of(new Modality(Modality.Known.AUDIO)))
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.setStreamingMode(RunConfig.StreamingMode.BIDI)
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.build();
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assertThat(initialConfig.inputAudioTranscription()).isNull();
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LiveRequestQueue liveQueue = new LiveRequestQueue();
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InvocationContext context =
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invokeNewInvocationContextForLive(runner, session, liveQueue, initialConfig);
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assertThat(context.runConfig().inputAudioTranscription()).isNotNull();
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}
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@Test
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public void newInvocationContextForLive_singleAgent_preservesUserInputAudioTranscription()
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throws Exception {
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TestLlm testLlm = createTestLlm(createLlmResponse(createContent("response")));
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// Single agent with NO sub-agents
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LlmAgent singleAgent = createTestAgentBuilder(testLlm).name("weather_agent").build();
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Runner runner = new InMemoryRunner(singleAgent, "test", ImmutableList.of());
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Session session = runner.sessionService().createSession("test", "user").blockingGet();
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AudioTranscriptionConfig userConfig = AudioTranscriptionConfig.builder().build();
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RunConfig configWithUserSetting =
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RunConfig.builder()
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.setResponseModalities(ImmutableList.of(new Modality(Modality.Known.AUDIO)))
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.setStreamingMode(RunConfig.StreamingMode.BIDI)
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.setInputAudioTranscription(userConfig)
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.build();
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LiveRequestQueue liveQueue = new LiveRequestQueue();
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InvocationContext context =
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invokeNewInvocationContextForLive(runner, session, liveQueue, configWithUserSetting);
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assertThat(context.runConfig().inputAudioTranscription()).isSameInstanceAs(userConfig);
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}
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}

‎pom.xml‎

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@@ -31,6 +31,7 @@
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<module>contrib/langchain4j</module>
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<module>contrib/samples</module>
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<module>tutorials/city-time-weather</module>
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<module>tutorials/live-audio-single-agent</module>
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<module>a2a</module>
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<module>a2a/webservice</module>
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</modules>

‎tutorials/live-audio-single-agent/README.md‎

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# Live Audio Single-Agent
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A tutorial demonstrating how the ADK (Agent Development Kit) automatically configures **inputAudioTranscription** and **outputAudioTranscription** for single-agent live scenarios. This tutorial showcases that the feature now works for all live scenarios, not just multi-agent scenarios.
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## What This Demonstrates
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This tutorial verifies the feature change in `Runner.java` that enables automatic transcription configuration for all live scenarios:
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**Before:** Only multi-agent scenarios got automatic transcription
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```java
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if (liveRequestQueue.isPresent() && !this.agent.subAgents().isEmpty())
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```
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**After:** All live scenarios (including single-agent) get automatic transcription
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```java
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if (liveRequestQueue.isPresent())
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```
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When you use this single-agent with live audio, the ADK automatically configures:
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- **inputAudioTranscription** - Transcribes user speech to text
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- **outputAudioTranscription** - Transcribes agent speech to text
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## Setup API Key
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```shell
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export GOOGLE_GENAI_API_KEY={YOUR-KEY}
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```
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## Go to Tutorial Directory
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```shell
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cd tutorials/live-audio-single-agent
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```
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## Running the Agent
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Start the server:
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```shell
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mvn exec:java
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```
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This starts the ADK web server with a single weather agent (`weather_agent`) that supports live audio using the `gemini-2.0-flash-live-001` model.
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## Usage
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Once running, you can interact with the agent through:
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- **Web interface:** `http://localhost:8080`
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- **Agent name:** `weather_agent`
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- **Try asking:** "What's the weather in Tokyo?" or "How's the weather in New York?"
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### Testing with Live Audio
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1. Open the web interface at `http://localhost:8080`
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2. Enable your microphone
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3. Speak to the agent: "What's the weather in Tokyo?"
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4. The agent will:
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- Automatically transcribe your speech to text (inputAudioTranscription)
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- Process the request and call the `getWeather` tool
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- Respond with audio (automatically transcribed via outputAudioTranscription)
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## Learn More
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See https://google.github.io/adk-docs/get-started/quickstart/#java for more information.

‎tutorials/live-audio-single-agent/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Copyright 2025 Google LLC
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>com.google.adk</groupId>
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<artifactId>google-adk-parent</artifactId>
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<version>0.3.1-SNAPSHOT</version><!-- {x-version-update:google-adk:current} -->
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<relativePath>../../pom.xml</relativePath>
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</parent>
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<artifactId>google-adk-tutorials-live-audio-single-agent</artifactId>
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<name>Agent Development Kit - Tutorial: Live Audio Single-Agent</name>
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<properties>
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<exec.mainClass>com.google.adk.tutorials.LiveAudioSingleAgent</exec.mainClass>
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</properties>
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<dependencies>
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<dependency>
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<groupId>com.google.adk</groupId>
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<artifactId>google-adk-dev</artifactId>
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<version>${project.version}</version>
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<exclusions>
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<exclusion>
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<groupId>ch.qos.logback</groupId>
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<artifactId>logback-classic</artifactId>
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</exclusion>
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</exclusions>
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</dependency>
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<dependency>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-simple</artifactId>
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</dependency>
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</dependencies>
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</project>
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‎tutorials/live-audio-single-agent/src/main/java/com/google/adk/tutorials/LiveAudioSingleAgent.java‎

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/*
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* Copyright 2025 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.adk.tutorials;
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import com.google.adk.agents.BaseAgent;
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import com.google.adk.agents.LlmAgent;
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import com.google.adk.tools.Annotations.Schema;
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import com.google.adk.tools.FunctionTool;
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import com.google.adk.web.AdkWebServer;
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import java.util.Map;
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public class LiveAudioSingleAgent {
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public static final BaseAgent WEATHER_AGENT =
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LlmAgent.builder()
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.name("weather_agent")
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.model("gemini-2.0-flash-live-001")
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.description("A helpful weather assistant that provides weather information.")
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.instruction(
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"You are a friendly weather assistant. When users ask about weather, "
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+ "you MUST call the getWeather tool with the location name. "
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+ "Extract the location from the user's question. "
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+ "ALWAYS use the getWeather tool to get accurate information - never make up weather data. "
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+ "After getting the tool result, provide a friendly and descriptive response. "
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+ "For general conversation or greetings, respond naturally and helpfully. "
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+ "Do NOT use code execution for anything.")
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.tools(FunctionTool.create(LiveAudioSingleAgent.class, "getWeather"))
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.build();
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public static Map<String, String> getWeather(
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@Schema(name = "location", description = "The location for which to retrieve weather")
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String location) {
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Map<String, Map<String, String>> weatherData =
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Map.of(
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"new york",
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Map.of(
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"status",
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"success",
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"temperature",
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"72°F (22°C)",
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"condition",
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"Partly cloudy",
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"report",
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"The weather in New York is partly cloudy with a temperature of 72°F (22°C)."),
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"london",
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Map.of(
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"status",
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"success",
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"temperature",
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"59°F (15°C)",
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"condition",
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"Rainy",
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"report",
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"The weather in London is rainy with a temperature of 59°F (15°C)."),
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"tokyo",
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Map.of(
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"status",
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"success",
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"temperature",
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"68°F (20°C)",
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"condition",
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"Clear",
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"report",
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"The weather in Tokyo is clear with a temperature of 68°F (20°C)."),
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"sydney",
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Map.of(
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"status",
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"success",
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"temperature",
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"77°F (25°C)",
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"condition",
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"Sunny",
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"report",
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"The weather in Sydney is sunny with a temperature of 77°F (25°C)."));
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String normalizedLocation = location.toLowerCase().trim();
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return weatherData.getOrDefault(
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normalizedLocation,
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Map.of(
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"status",
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"error",
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"report",
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String.format(
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"Weather information for '%s' is not available. Try New York, London, Tokyo, or"
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+ " Sydney.",
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location)));
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}
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public static void main(String[] args) {
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AdkWebServer.start(WEATHER_AGENT);
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}
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}

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