[libcamera-devel,RFC,2/8] android: CameraDevice: Report proper min and max frame durations
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Message ID 20210401101340.160590-3-paul.elder@ideasonboard.com
State Superseded
Delegated to: Paul Elder
Headers show
Series
  • android: First set of FULL fixes
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Commit Message

Paul Elder April 1, 2021, 10:13 a.m. UTC
The HAL layer was getting the min and max frame durations from from the
camera, then rounding it to fps to report as available fps ranges. The
same min and max frame durations were then being reported as min and max
frame durations. Since the fps are integer values while the frame
durations are in ns, this caused a rounding error making it seem like we
were reporting an available max fps that was higher than was was allowed
by the minimum frame duration.

Fix this by recalculating the frame durations based on the rounded fps
values.

This allows the following CTS test to pass:
- android.hardware.camera2.cts.SurfaceViewPreviewTest#testPreviewFpsRange

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
---
 src/android/camera_device.cpp | 4 ++++
 1 file changed, 4 insertions(+)

Patch
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diff --git a/src/android/camera_device.cpp b/src/android/camera_device.cpp
index 2a685507..30ea3ade 100644
--- a/src/android/camera_device.cpp
+++ b/src/android/camera_device.cpp
@@ -799,6 +799,10 @@  const camera_metadata_t *CameraDevice::getStaticMetadata()
 		int32_t minFps = std::round(1e9 / maxFrameDurationNsec);
 		minFps = std::max(1, minFps);
 
+		/* Avoid rounding errors when we reuse these variables later */
+		minFrameDurationNsec = 1e9 / maxFps;
+		maxFrameDurationNsec = 1e9 / minFps;
+
 		/*
 		 * Register to the camera service {min, max} and {max, max}
 		 * intervals as requested by the metadata documentation.