Play an audio stream into a call

This code snippet plays an audio stream into the specified call.

Example

Replace the following variables in the example code:

Key	Description
`UUID`	The UUID of the call leg
`URL`	The URL of the audio file that will be streamed into an array. The URL must be in an array.

Prerequisites

Modifying an existing call requires that the UUID provided is a currently active call. To modify a call, you must use the same VONAGE_APPLICATION_ID and private key that were used to create the call.

Execute the following command at your terminal prompt to create the JWT for authentication:

export JWT=$(nexmo jwt:generate $PATH_TO_PRIVATE_KEY application_id=$NEXMO_APPLICATION_ID)

Write the code

Add the following to play-audio-into-a-call.sh:

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curl -X PUT https://api.nexmo.com/v1/calls/$UUID/stream \
  -H "Authorization: Bearer "$JWT\
  -H "Content-Type: application/json"\
  -d '{"stream_url": ["https://raw.githubusercontent.com/nexmo-community/ncco-examples/gh-pages/assets/welcome_to_nexmo.mp3"]}'

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Run your code

Save this file to your machine and run it:

bash play-audio-into-a-call.sh

Prerequisites

npm install @vonage/server-sdk

Create a file named stream-audio-into-call.js and add the following code:

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const Vonage = require('@vonage/server-sdk');

const vonage = new Vonage({
  apiKey: VONAGE_API_KEY,
  apiSecret: VONAGE_API_SECRET,
  applicationId: VONAGE_APPLICATION_ID,
  privateKey: VONAGE_PRIVATE_KEY
}, {debug: true});

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Write the code

Add the following to stream-audio-into-call.js:

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const URL = 'https://nexmo-community.github.io/ncco-examples/assets/voice_api_audio_streaming.mp3';

vonage.calls.stream.start(UUID, { stream_url: [URL], loop: 0 }, (err, res) => {
  if(err) { console.error(err); }
  else {
      console.log(res);
  }
});

function stop_stream (){
    vonage.calls.stream.stop(UUID, (err, res) => {
        if(err) { console.error(err); }
        else {
            console.log(res);
        }
    });
}

setTimeout(stop_stream, 5000); // delay 5 seconds

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Run your code

Save this file to your machine and run it:

node stream-audio-into-call.js

Prerequisites

Add the following to `build.gradle`:

compile 'com.vonage:client:5.5.0'

Create a class named StreamAudioToCall and add the following code to the main method:

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VonageClient client = VonageClient.builder()
        .applicationId(VONAGE_APPLICATION_ID)
        .privateKeyPath(VONAGE_PRIVATE_KEY_PATH)
        .build();

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Write the code

Add the following to the main method of the StreamAudioToCall class:

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final String ANSWER_URL = "https://nexmo-community.github.io/ncco-examples/long-tts.json";
CallEvent call = client.getVoiceClient().createCall(new Call(
        TO_NUMBER,
        VONAGE_NUMBER,
        ANSWER_URL
));

Thread.sleep(20000);

final String UUID = call.getUuid();
final String URL = "https://nexmo-community.github.io/ncco-examples/assets/voice_api_audio_streaming.mp3";

client.getVoiceClient().startStream(UUID, URL, 0);
Thread.sleep(5000);
client.getVoiceClient().stopStream(UUID);

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Run your code

We can use the application plugin for Gradle to simplify the running of our application. Update your build.gradle with the following:

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  apply plugin: 'application'
  mainClassName = project.hasProperty('main') ? project.getProperty('main') : ''

Run the following gradle command to execute your application, replacing com.vonage.quickstart.voice with the package containing StreamAudioToCall:

gradle run -Pmain=com.vonage.quickstart.voice.StreamAudioToCall

Prerequisites

Install-Package Vonage

Create a file named PlayAudioStreamIntoCall.cs and add the following code:

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using Vonage;
using Vonage.Request;
using Vonage.Voice;

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Add the following to PlayAudioStreamIntoCall.cs:

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var credentials = Credentials.FromAppIdAndPrivateKeyPath(VONAGE_APPLICATION_ID, VONAGE_PRIVATE_KEY_PATH);
var client = new VonageClient(credentials);

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Write the code

Add the following to PlayAudioStreamIntoCall.cs:

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var command = new StreamCommand() { StreamUrl = new[] { URL } };

var response = client.VoiceClient.StartStream(UUID, command);

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Prerequisites

composer require vonage/client

Create a file named index.php and add the following code:

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$keypair = new \Vonage\Client\Credentials\Keypair(
    file_get_contents(VONAGE_APPLICATION_PRIVATE_KEY_PATH),
    VONAGE_APPLICATION_ID
);

$client = new \Vonage\Client($keypair);

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Write the code

Add the following to index.php:

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$client->voice()->streamAudio(UUID, 'https://nexmo-community.github.io/ncco-examples/assets/voice_api_audio_streaming.mp3');

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Run your code

Save this file to your machine and run it:

php index.php

Prerequisites

pip install vonage

Create a file named play-audio-stream-into-call.py and add the following code:

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client = vonage.Client(
    application_id=VONAGE_APPLICATION_ID,
    private_key=VONAGE_APPLICATION_PRIVATE_KEY_PATH
)

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Write the code

Add the following to play-audio-stream-into-call.py:

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voice = vonage.Voice(client)

stream_url = 'https://nexmo-community.github.io/ncco-examples/assets/voice_api_audio_streaming.mp3'
voice.send_audio(VONAGE_CALL_UUID, stream_url=[stream_url])

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Run your code

Save this file to your machine and run it:

python3 play-audio-stream-into-call.py

Prerequisites

gem install vonage

Create a file named play-audio-stream-into-call.rb and add the following code:

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client = Vonage::Client.new(
  application_id: VONAGE_APPLICATION_ID,
  private_key: File.read(VONAGE_APPLICATION_PRIVATE_KEY_PATH)

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Write the code

Add the following to play-audio-stream-into-call.rb:

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AUDIO_URL = 'https://nexmo-community.github.io/ncco-examples/assets/voice_api_audio_streaming.mp3'
response = client.voice.stream.start(UUID, stream_url: [AUDIO_URL])

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Run your code

Save this file to your machine and run it:

ruby play-audio-stream-into-call.rb

Try it out

When you run the code an audio stream from the file specified is played into the call identified with the specified UUID.

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