emulated_camera_mplane: Implement frame rate control - #2990
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Decouple frame generation from the vhost-user command thread into a
dedicated background worker thread to enforce a 30 FPS frame rate while
maintaining non-blocking V4L2 ioctl behavior and v4l2-compliance.
Bug: b/534454250
Test: atest CtsCameraTestCases:\
android.hardware.cts.CameraTest#testPreviewFpsRange
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Decouple frame generation from the vhost-user command thread into a dedicated background worker thread to enforce a 30 FPS frame rate while maintaining non-blocking V4L2 ioctl behavior and v4l2-compliance.
Bug: b/534454250
Test: android.hardware.cts.CameraTest#testPreviewFpsRange