Start a Voice Call

Use this guide to quickly start a basic voice call demo with the Agora Voice SDK for macOS.

Understand the tech

The following figure shows the workflow of a voice call implemented by the Agora SDK.

As shown in the figure, the workflow for adding Voice Call in your project is as follows:

1. Retrieve a token
   A token is the credential that authenticates a user when your app client joins a channel. In a test or production environment, your app client retrieves tokens from a server in your security infrastructure.

2. Join a channel
   Call joinChannel to create and join a channel. App clients that pass the same channel name join the same channel.

3. Publish and subscribe to audio in the channel
   After joining a channel, the app client automatically publishes and subscribes to audio in the channel.

For an app client to join an RTC channel, you need the following information:

• The App ID: A randomly generated string provided by Agora for identifying your app. You can get the App ID from Agora Console.
• The user ID: The unique identifier of a user. You need to specify the user ID yourself, and ensure that it is unique in the channel.
• A token: In a test or production environment, your app client retrieves tokens from a server in your security infrastructure. For this page, you use a temporary token with a validity period of 24 hours that you retrieve from Agora Console.
• The channel name: A string that identifies the channel for the voice call.

Prerequisites

• Xcode 11.0 or later (the interface description in this article is based on Xcode 11.0).
• A macOS device running macOS 10.10 or later.
• A valid Agora account.

Create a macOS project

1. Open Xcode, and click Create a new Xcode project.

2. Choose macOS as the target platform, App as the template, and click Next.

3. Input the project information, such as the product name, team, organization name, and language, and click Next.

   If you have not added any team information, you can see an Add account... button. Click it, input your Apple ID, and click Next to add your team.

4. Choose the storage path of the project, and click Create.

Integrate the SDK

Choose one of the following methods to obtain the Agora macOS SDK:

Method 1: Through CocoaPods

1. Ensure that you have installed CocoaPods before the following steps. See the installation guide in Getting Started with CocoaPods.

2. In Terminal, navigate to the project path, and run the pod init command to create a Podfile in the project folder.

3. Open the Podfile, delete all contents, and input the following codes. Remember to replace Your App with the target name of your project.

    # platform :macos, '10.11'
    target 'Your App' do
      pod 'AgoraRtcEngine_macOS'
    end

4. Return to Terminal, and run the pod install command to install the Agora SDK. Once you successfully install the SDK, it shows Pod installation complete! in Terminal, and you can see an xcworkspace file in the project folder.

5. Open the generated xcworkspace file.

Method 2: Through the Agora website

1. Navigate to SDK Downloads, download the latest version of the Agora macOS SDK, and extract the files from the downloaded SDK package.

2. According to your requirements, copy the libraries from the libs folder of the SDK to the ./project_name folder in your project (project_name is an example of your project name).

3. Open Xcode, and navigate to TARGETS > Project Name > General > Frameworks, Libraries, and Embedded Content.

4. Click + > Add Other… > Add Files to add the corresponding libraries. Ensure that the Embed attribute of these dynamic libraries is Embed & Sign.

Method 3: Through Swift Package Manager

1. In Xcode, go to File > Swift Packages > Add Package Dependencies..., and paste the following URL:

   https://github.com/AgoraIO/AgoraAudio_macOS

2. In Choose Package Options, specify the SDK version that you want to integrate. If the version number is x.y.z, fill in x.y.z; if the version number is x.y.z.a, fill in x.y.z-r.a.

Implementation

Once you have integrated the Agora macOS SDK into your project, you need to call the core APIs provided by the Agora macOS SDK in the ViewController file to implement basic voice call. The API call sequence is shown in the following figure:

1. Import the class

Before calling any Agora API, import the AgoraRtcKit class, and define agoraKit.

// ViewController.h
// Imports the AgoraRtcKit class
// For SDKs earlier than 3.0.0, AgoraRtcKit is named AgoraRtcEngineKit
// If you use a SDK earlier than 3.0.0, use "#import <AgoraRtcEngineKit/AgoraRtcEngineKit.h>" instead
#import <AgoraRtcKit/AgoraRtcEngineKit.h>
// Specifies AgoraRtcEngineDelegate for monitoring a callback
@interface ViewController : NSViewController <AgoraRtcEngineDelegate>
// Defines agoraKit
@property (strong, nonatomic) AgoraRtcEngineKit *agoraKit;

// ViewController.swift
// Imports the AgoraRtcKit class
// For SDKs earlier than 3.0.0, AgoraRtcKit is named AgoraRtcEngineKit
// If you use a SDK earlier than 3.0.0, use "import AgoraRtcEngineKit" instead
import AgoraRtcKit
class ViewController: NSViewController {
    ...
    // Defines agoraKit
    var agoraKit: AgoraRtcEngineKit?
}

2. Initialize AgoraRtcEngineKit

Call the sharedEngineWithAppId method to create and initialize the AgoraRtcEngineKit object.

When adding the following code in your project, replace YourAppID with the App ID of your project. See Get an App ID.

If you want to monitor a callback for your app scenario, register it when initializing AgoraRtcEngineKit.

// ViewController.m
// Types the followiing code in the function you defines, such as viewDidLoad()
self.agoraKit = [AgoraRtcEngineKit sharedEngineWithAppId:@"YourAppID" delegate:self];

// ViewController.swift
// Types the followiing code in the function you defines, such as viewDidLoad()
agoraKit = AgoraRtcEngineKit.sharedEngine(withAppId: "YourAppID", delegate: self)

3. Join a channel

Call the joinChannelByToken method to join a channel. When adding the following code in your project, replace YourToken with the token of your project, and replace YourChannelName with the channel name used to generate the token of your project.

• For testing, you can generate a temporary token in Agora Console.
• For production, Agora recommends using a token generated at your server. See Generate a Token.

// ViewController.m
// Types the followiing code in the function you defines, such as viewDidLoad()
// The uid of each user in the channel must be unique.
[self.agoraKit joinChannelByToken:@"YourToken" channelId:@"YourChannelName" info:nil uid:0 joinSuccess:^(NSString * _Nonnull channel, NSUInteger uid, NSInteger elapsed) {
}];

// ViewController.swift
// Types the followiing code in the function you defines, such as viewDidLoad()
// The uid of each user in the channel must be unique.
agoraKit?.joinChannel(byToken: "YourToken", channelId: "YourChannelName", info: nil, uid: 0, joinSuccess: { (channel, uid, elapsed) in
})

4. Leave the channel

Call the leaveChannel method when you need to leave the channel, for example, to end the call, close the app, or run the app in the background.

// ViewController.m
// Types the followiing code in the function you defines
[self.agoraKit leaveChannel:nil];

// ViewController.swift
// Types the followiing code in the function you defines
agoraKit?.leaveChannel(nil)

5. Destroy AgoraRtcEngineKit

After leaving the channel, if you want to release all resources used by the Agora SDK, call the destroy method to destroy the AgoraRtcEngineKit object.

// ViewController.m
// Types the followiing code in the function you defines
[AgoraRtcEngineKit destroy];

// ViewController.swift
// Types the followiing code in the function you defines
AgoraRtcEngineKit.destroy()

Run the project

Before running the project, you need to set your signing and team, and add device permissions.

1. Set your signing and team

1. In Xcode, navigate to TARGETS > Project Name > General > Signing, and choose Automatically manage signing.
2. Read the prompts carefully, and click Enable Automatic.
3. After you successfully set your signing, choose a developer in Team.

2. Add device permissions

1. In Xcode, open the info.plist file. Add the following contents to add permissions for your device:

2. Navigate to TARGETS > Project Name > Signing & Capabilities, and add the following permissions in App Sandbox and Hardened Runtime:

3. In Xcode 12.2 and later, to avoid compliation errors, you need to navigate to TARGETS > Project Name > Build Settings > Architectures, and set the Architectures property to x86_64 before the compilation.

3. Try a voice call

Agora recommends running the project on a real device instead of a simulator.

To test the remote audio, visit the Web Demo, and enter the same App ID, channel name, and token to join the same channel. You should hear the remote user when you successfully start a one-to-one voice call in the app.

Integrate earlier versions of the SDK

Choose one of the following methods to integrate a version of the Agora macOS SDK earlier than v3.2.0.

Method 1: Through CocoaPods

1. Ensure that you have installed CocoaPods before performing the following steps. See the installation guide in Getting Started with CocoaPods.

2. In Terminal, navigate to the project path, and run the pod init command to create a Podfile in the project folder.

3. Open the Podfile, delete all contents, and input the following codes. Remember to replace Your App with the target name of your project and replace version with the version of the SDK that you want to integrate. For information about the SDK version, see Release Notes.

# platform :macos, '10.11'
target 'Your App' do
  pod 'AgoraRtcEngine_macOS', 'version'
end

4. Return to Terminal, and run the pod install command to install the Agora SDK. Once you successfully install the SDK, it shows Pod installation complete! in Terminal, and you can see an xcworkspace file in the project folder.

5. Open the generated xcworkspace file.

Method 2: Through your local storage

You need to use different integration methods to integrate different versions of the SDK. Click the following version categories to expand the corresponding integration steps.

Reference

When integrating the Agora Voice SDK, you can also refer to the following articles:

• How can I set the log file?
• How can I implement call notification in a call application?