[Enhancement]Improve frame rendering #70
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Introduce stream_enable_rendering_backend GN arg to isolate Stream-specific rendering changes. When enabled, build a new shared Metal backend target and swap in an NV12-capable ObjC frame buffer bridge; otherwise keep upstream objc_frame_buffer unchanged. - add RTCSharedMetal* view/context/adapter and wire RTCVideoRenderingView to use it on iOS when RTC_STREAM_RENDERING_BACKEND is set - add maxInFlightFrames to RTCVideoRenderingView and forward to backend - gate NV12 wrappers and ObjC frame-buffer policy to stream builds only - move NV12 policy implementation to objc_frame_buffer_stream.mm and keep objc_frame_buffer.mm clean - export NV12 headers only when the stream flag is enabled - add comments to clarify gating and platform behavior
This was referenced Jan 28, 2026
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