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 into which to play an audio stream.
`URL`	The URL of the audio file that will be streamed into an array. The URL must be in an array.

Prerequisites

Use your existing application

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

Generate your JWT

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

Use your existing application

Install dependencies

npm install nexmo dotenv

Initialize your dependencies

Create a file named app.js and add the following code:

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const Nexmo = require('nexmo');

const nexmo = new Nexmo({
  apiKey: NEXMO_API_KEY,
  apiSecret: NEXMO_API_SECRET,
  applicationId: NEXMO_APPLICATION_ID,
  privateKey: NEXMO_PRIVATE_KEY
}, {debug: true});

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Write the code

Add the following to app.js:

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

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

function stop_stream (){
    nexmo.calls.stream.stop(CALL_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 app.js

Prerequisites

Use your existing application

Install dependencies

Add the following to build.gradle:

compile 'com.nexmo:client:4.3.0'

Initialize your dependencies

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

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NexmoClient client = NexmoClient.builder()
        .applicationId(NEXMO_APPLICATION_ID)
        .privateKeyPath(NEXMO_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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client.getVoiceClient().startStream(UUID, URL, 0);

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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:

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

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

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

Prerequisites

Use your existing application

Install dependencies

Install-Package Nexmo.Csharp.Client

Initialize your dependencies

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

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var client = new Client(creds: new Nexmo.Api.Request.Credentials
{
    ApiKey = "NEXMO_API_KEY",
    ApiSecret = "NEXMO_API_SECRET",
    ApplicationId = "NEXMO_APPLICATION_ID",
    ApplicationKey = "NEXMO_APPLICATION_PRIVATE_KEY"
});

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Write the code

Add the following to VoiceController.cs:

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var result = Client.Call.BeginStream(UUID, new Call.StreamCommand
{
    stream_url = new[]
    {
            "https://nexmo-community.github.io/ncco-examples/assets/voice_api_audio_streaming.mp3"
        }
});

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Prerequisites

Use your existing application

Install dependencies

composer require nexmo/client

Initialize your dependencies

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

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$keypair = new \Nexmo\Client\Credentials\Keypair(
    file_get_contents(NEXMO_APPLICATION_PRIVATE_KEY_PATH),
    NEXMO_APPLICATION_ID
);

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

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Write the code

Add the following to index.php:

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$stream = $client->calls[UUID]->stream();
$stream->setUrl('https://nexmo-community.github.io/ncco-examples/assets/voice_api_audio_streaming.mp3');
$stream->put();

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Run your code

Save this file to your machine and run it:

php index.php

Prerequisites

Use your existing application

Install dependencies

pip install nexmo

Initialize your dependencies

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

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import nexmo

client = nexmo.Client(
    application_id=APPLICATION_ID,
    private_key=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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stream_url = 'https://nexmo-community.github.io/ncco-examples/assets/voice_api_audio_streaming.mp3'
client.send_audio(NEXMO_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

Use your existing application

Install dependencies

gem install nexmo

Initialize your dependencies

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

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require 'nexmo'

client = Nexmo::Client.new(
    application_id: NEXMO_APPLICATION_ID,
    private_key: File.read(NEXMO_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.calls.stream.start(UUID, stream_url: [AUDIO_URL])

puts response.inspect

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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.