Mobile live streaming uses mainly the portrait mode, but TRTC supports both the landscape and portrait modes, making it necessary to implement different page orientation logics. This document introduces you to the following:
How to implement the portrait mode, for example, for video calls like those on WeChat
How to implement the landscape mode, for example, for group communication applications such as Zoom
How to customize settings for the rotation and rendering mode of the local image and remote images.
Supported Platforms
iOS
Android
macOS
Windows
Electron
Web
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Portrait Mode
To deliver an experience similar to that of WeChat video calls, you need to do two things.
1. Set the orientation of your app to portrait.
iOS
Android
Set the page orientation in Xcode > General > Deployment Info > Device Orientation.
Alternatively, use the supportedInterfaceOrientationsForWindow method in Appdelegate.
When you use the setVideoEncoderParam API of TRTCCloud to set video encoding parameters, set resMode to TRTCVideoResolutionModePortrait.
Below is the sample code:
encParam.videoResolutionMode =TRTCCloudDef.TRTC_VIDEO_RESOLUTION_MODE_PORTRAIT;//Set the resolution mode to portrait.
trtc.setVideoEncoderParam(encParam);
Landscape Mode
The steps to implement the landscape mode for your app are similar to the steps of implementing the portrait mode, except that different values are used for the parameters in step 1 and step 2.
In particular, regarding the value of resMode in TRTCVideoEncParam in step 2,
on iOS, set it to TRTCVideoResolutionModeLandscape.
on Android, set it to TRTC_VIDEO_RESOLUTION_MODE_LANDSCAPE.
Custom Settings
The TRTC SDK provides different APIs for the setting of the rotation and rendering mode of the local image and remote images.
API
Description
Remarks
setLocalViewRotation
Set the clockwise rotation of the local image preview
Rotate 90, 180, or 270 degrees clockwise
setLocalViewFillMode
Set the rendering mode of the local image preview
Crop the image or fill the blank space with black bars
setRemoteViewRotation
Set the clockwise rotation of remote video images
Rotate 90, 180, or 270 degrees clockwise
setRemoteViewFillMode
Set the rendering mode of remote video images
Crop the image or fill the blank space with black bars
setVideoEncoderRotation
Set the clockwise rotation of encoded images
Rotate 90, 180, or 270 degrees clockwise
GSensorMode
For adaptation during video recording and CDN live streaming, the TRTC SDK provides a simple gravity-sensing adaptation feature, which you can enable using the setGSensorMode API of TRTCCloud.
The feature supports 90-degrees, 180-degrees and 270-degrees adaptive rotation. This means that when a user's phone is turned, the orientation of the user's image seen by remote users remains the same. Since the feature is achieved through encoder-based rotation adjustment, adaptive rotation is also possible for recorded videos and videos played via HTML5 players.
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Another way to achieve adaptive rotation is by embedding the gravity direction of a video in the information of each video frame, and adjusting the rotation degree of the video at the viewer end. This scheme requires the introduction of additional transcoding resources to adjust the orientation of recorded videos as expected and is therefore not recommended.
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