# Listen for audio events

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The Video SDK for Windows fires audio-related callbacks through `IZoomVideoSDKDelegate`. Implement the callbacks below to react to audio state changes in your session.

For details on setting up a delegate, see [callback events](/docs/video-sdk/windows/integrate/#callback-events).

The `onUserAudioStatusChanged` callback is different from `onUserActiveAudioChanged`.

-   The SDK calls `onUserAudioStatusChanged` when the user's audio status changes.
-   The SDK calls `onUserActiveAudioChanged` when a given user's active audio changes. For example, if the user is unmuted and is using their device's microphone, the SDK triggers this callback whenever their microphone detects a sound.

## Get notified when a user's audio status has changed

`onUserAudioStatusChanged` fires when a user mutes, unmutes, connects, or disconnects their audio.

```cpp
void CExampleListener::onUserAudioStatusChanged(IZoomVideoSDKAudioHelper* pAudioHelper, IVideoSDKVector<IZoomVideoSDKUser*>* userList)
{
    IZoomVideoSDKUser* pUser;
    int count = userList->GetCount();

    for (int i = 0; i < count; i++)
    {
        pUser = userList->GetItem(i);
        // Use isMuted to check whether the user's audio is muted.
        bool isMuted = pUser->getAudioStatus().isMuted;
    }
}
```

## Get notified when a user's active audio changes

`onUserActiveAudioChanged` fires when an unmuted user's microphone detects sound. Use the `isTalking` field of the user's audio status to drive a talking indicator in your UI.

```cpp
void CExampleListener::onUserActiveAudioChanged(IZoomVideoSDKAudioHelper* pAudioHelper, IVideoSDKVector<IZoomVideoSDKUser*>* list)
{
    IZoomVideoSDKUser* pUser;
    int count = list->GetCount();

    for (int i = 0; i < count; i++)
    {
        pUser = list->GetItem(i);
        // Use isTalking to see whether the user is currently talking.
        if (pUser->getAudioStatus().isTalking)
        {
            // The user began talking.
        }
    }
}
```

## Get notified when mixed audio raw data is received

After you [subscribe to raw audio](/docs/video-sdk/windows/audio/advanced/#subscribe-to-raw-audio-data), `onMixedAudioRawDataReceived` delivers the mixed audio of all users.

```cpp
void CExampleListener::onMixedAudioRawDataReceived(AudioRawData* data_)
{
    // data_ contains the mixed PCM audio for all users.
}
```

## Get notified when one-way audio raw data is received

`onOneWayAudioRawDataReceived` delivers the raw audio of a single user.

```cpp
void CExampleListener::onOneWayAudioRawDataReceived(AudioRawData* data_, IZoomVideoSDKUser* pUser)
{
    // data_ contains the PCM audio for the given user.
}
```

## Get notified when shared audio raw data is received

`onSharedAudioRawDataReceived` delivers the raw audio shared along with a screen share.

```cpp
void CExampleListener::onSharedAudioRawDataReceived(AudioRawData* data_)
{
    // data_ contains the shared PCM audio.
}
```