This example shows how to dynamically swap in a custom playback renderer while subscribing to a stream.
By default, the R5VideoViewController has an internal R5VideoViewRenderer instance that sends off rendering of decoded video frames to OpenGL.
You can define your own R5VideoViewRenderer instance to be used by utilizing the renderer mutator of R5VideoViewController. Additionally, you can reset the renderer before AND after already having started playback of a stream; this allows you to dynamically change how the stream is played back based on live information coming from the broadcaster.
As an example: your playback may not know that the broadcaster is using a 360 camera until after already subscribing and getting a notification of camera type. As such, you want to be able to dynamically - while not interrupting the playback - be able to update the rendering functionality of the stream.
Totally possible. In fact, this example demonstrates that!
Well, in at least that you can dynamically swap in a renderer duing playback...
In this example, we use the Custom360VideoViewRenderer created for the Subscribe360 example. There is much more information about the APIs involved in the documentation for that example, so be sure to check it out.
In short, you can swap in an alternate R5VideoViewRenderer instance dynamically, during playback without having to teardown and re-setup the connection!
The example uses a UIButton that you tap to invoke the toggleRenderer gesture delegate, which then updates the renderer property of the R5VideoViewController instance:
@objc func toggleRenderer () {
if let context = EAGLContext(api: .openGLES3) {
EAGLContext.setCurrent(context)
let glView = GLKView.init(frame: self.view.bounds, context: context);
currentView?.renderer = Custom360VideoViewRenderer(glView: glView)
}
}SubscribeRendererSwapTest.swift #50
Doing so will swap in the custom 360 renderer created from the Subscribe 360 example.
It is important to note that once the
rendererhas been set to a custom renderer created by you - or with our example - theR5VideoViewControllercan not go back to using its internal rendering routines - this includes trying to set it back to the defaultR5VideoViewRenderer.