How to adjust the camera's focal length (zoom function)?

ZEGO provides camera zoom function. By setting the zoom factor of the camera through the SDK, you can achieve the effect of magnifying distant objects when shooting.

Usage Steps

Get the Maximum Zoom Factor of the Camera

Call the getCameraMaxZoomFactor interface to get the maximum zoom factor of the camera. The interface is only effective after the camera is successfully started. It is recommended to call it after receiving the onPublisherCapturedVideoFirstFrame callback.

• iOS

- (void)onPublisherCapturedVideoFirstFrame:(ZegoPublishChannel)channel {
    self.maxZoomFactor = [[ZegoExpressEngine sharedEngine] getCameraMaxZoomFactor];
}

- (void)onPublisherCapturedVideoFirstFrame:(ZegoPublishChannel)channel {
    self.maxZoomFactor = [[ZegoExpressEngine sharedEngine] getCameraMaxZoomFactor];
}

• Android

ZegoExpressEngine.getEngine().setEventHandler(new IZegoEventHandler() {
    @Override
    public void onPublisherCapturedVideoFirstFrame(ZegoPublishChannel channel) {
    	float maxZoomFactor=ZegoExpressEngine.getEngine().getCameraMaxZoomFactor();
    }
});

ZegoExpressEngine.getEngine().setEventHandler(new IZegoEventHandler() {
    @Override
    public void onPublisherCapturedVideoFirstFrame(ZegoPublishChannel channel) {
    	float maxZoomFactor=ZegoExpressEngine.getEngine().getCameraMaxZoomFactor();
    }
});

• uni-app

this.engine.on("publisherCapturedVideoFirstFrame", (channel) => {
    let maxZoomFactor = this.engine.getCameraMaxZoomFactor();
});

this.engine.on("publisherCapturedVideoFirstFrame", (channel) => {
    let maxZoomFactor = this.engine.getCameraMaxZoomFactor();
});

Set Camera Zoom Factor

Call the setCameraZoomFactor interface to set the zoom factor of the camera. The minimum value is "1.0", and the maximum value can be obtained from the getCameraMaxZoomFactor interface.

• iOS

[[ZegoExpressEngine sharedEngine] setCameraZoomFactor:self.maxZoomFactor];

[[ZegoExpressEngine sharedEngine] setCameraZoomFactor:self.maxZoomFactor];

• Android

ZegoExpressEngine.getEngine().setCameraZoomFactor(maxZoomFactor);

ZegoExpressEngine.getEngine().setCameraZoomFactor(maxZoomFactor);

• uni-app

this.engine.setCameraZoomFactor(maxZoomFactor);

this.engine.setCameraZoomFactor(maxZoomFactor);