Video playback: extended API with volume, playback rate, seek ranges,
buffered ranges, can_play_type, audio-only mode. Unified player wrapping
native backend (AVPlayer/GStreamer/MediaFoundation) with software fallback.
YUV shader pipeline (BT.601/709/2020, NV12 biplanar, rotation).
Camera: V4L2 backend (Linux), expanded NDK Camera2 (Android), AVCapture
stream refactor (iOS/macOS) with shared session architecture. NV12
zero-copy paths on iOS (CVMetalTextureCache) and Android (AImage planes).
Camera preview modes (texture/native/auto).
Video encoding: H264 hardware encode on Apple (VideoToolbox) and Android
(MediaCodec). Camera-to-encoder pipeline with pixel buffer passthrough.
Media plugin system: externalized codec implementation via MediaPlugin
trait. MsePlayer, VideoFrameDecoder, MediaVideoEncoder, SoftwareVideoPlayer
interfaces. Runtime codec capability query and merge.
Includes camera example app.
Co-authored-by: ant <ant@offline.click>
