# Multiple camera support

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Users can use both the front and back cameras of their iOS device simultaneously using the methods provided by the Video SDK for iOS. Multiple cameras can also be used while screen sharing.

First confirm the device supports multiple streams with `isMultiStreamSupported`.

```swift
if let videoHelper = ZoomVideoSDK.shareInstance()?.getVideoHelper(), videoHelper.isMultiStreamSupported() {
    // Multiple camera streams are supported.
}
```

```objectivec
BOOL isMultiStreamSupported = [[[ZoomVideoSDK shareInstance] getVideoHelper] isMultiStreamSupported];
if (isMultiStreamSupported) {
    // Multiple camera streams are supported.
}
```

To enumerate the available cameras and read each camera's `deviceId`, see [Get the camera list](/docs/video-sdk/ios/video/camera-controls/#get-the-camera-list).

## Enable or disable a multi-camera stream

Pass a `deviceId` from the camera list to enable or disable that camera as a multi-stream. Enable and disable both fire `onMultiCameraStreamStatusChanged`. For the callback overloads, see [Multi-camera stream status](/docs/video-sdk/ios/video/video-events/#multi-camera-stream-status).

```swift
let enableResult = videoHelper.enableMultiStreamVideo("cameraDeviceID", customDeviceName: nil)
let disableResult = videoHelper.disableMultiStreamVideo("cameraDeviceID")
```

```objectivec
BOOL enableResult = [[[ZoomVideoSDK shareInstance] getVideoHelper] enableMultiStreamVideo:@"cameraDeviceID" customDeviceName:nil];
BOOL disableResult = [[[ZoomVideoSDK shareInstance] getVideoHelper] disableMultiStreamVideo:@"cameraDeviceID"];
```

## Mute or unmute a multi-camera stream

Mute or unmute an active multi-camera stream by its `deviceId`.

```swift
let muteResult = videoHelper.muteMultiStreamVideo("cameraDeviceID")
let unmuteResult = videoHelper.unmuteMultiStreamVideo("cameraDeviceID")
```

```objectivec
BOOL muteResult = [[[ZoomVideoSDK shareInstance] getVideoHelper] muteMultiStreamVideo:@"cameraDeviceID"];
BOOL unmuteResult = [[[ZoomVideoSDK shareInstance] getVideoHelper] unmuteMultiStreamVideo:@"cameraDeviceID"];
```

## Map a pipe or canvas back to a device ID

To find the `deviceId` for a multi-camera pipe or canvas, use `getDeviceIDByMyPipe` or `getDeviceIDByMyCanvas`. For more on handling raw data, see [Raw data](/docs/video-sdk/ios/raw-data/).

```swift
if let localUser = ZoomVideoSDK.shareInstance()?.getSession()?.getMySelf() {
    // Get the user's multi-camera streams (ZoomVideoSDKRawDataPipe).
    if let pipeList = localUser.getMultiCameraStreamList() {
        for pipe in pipeList {
            let deviceID = videoHelper.getDeviceID(byMyPipe: pipe)
        }
    }

    // Get the user's multi-camera canvases (ZoomVideoSDKVideoCanvas).
    if let canvasList = localUser.getMultiCameraCanvasList() {
        for canvas in canvasList {
            let deviceID = videoHelper.getDeviceID(byMyCanvas: canvas)
        }
    }
}
```

```objectivec
ZoomVideoSDKUser *localUser = [[[ZoomVideoSDK shareInstance] getSession] getMySelf];

// Get the user's multi-camera streams (ZoomVideoSDKRawDataPipe).
NSArray<ZoomVideoSDKRawDataPipe *> *pipeList = localUser.getMultiCameraStreamList;
for (ZoomVideoSDKRawDataPipe *pipe in pipeList) {
    NSString *deviceID = [[[ZoomVideoSDK shareInstance] getVideoHelper] getDeviceIDByMyPipe:pipe];
}

// Get the user's multi-camera canvases (ZoomVideoSDKVideoCanvas).
NSArray<ZoomVideoSDKVideoCanvas *> *canvasList = localUser.getMultiCameraCanvasList;
for (ZoomVideoSDKVideoCanvas *canvas in canvasList) {
    NSString *deviceID = [[[ZoomVideoSDK shareInstance] getVideoHelper] getDeviceIDByMyCanvas:canvas];
}
```