[libcamera-devel] [PATCH 4/5] android: camera_device: Use AE FPS range in template

[Jacopo Mondi]

The request template returned by requestTemplatePreview() uses an
arbitrary {15, 30} Auto-Exposure algorithm FPS range. Use the one
calculated at static metadata creation time, which is consistent with
the camera limits.

Once template generation will be performed inspecting the requested
capture intent, the FPS range over which the AE algorithm can range
shall be tuned accordingly.

Signed-off-by: Jacopo Mondi <jacopo at jmondi.org>
---
 src/android/camera_device.cpp | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/src/android/camera_device.cpp b/src/android/camera_device.cpp
index aa50a151668d..3560f16698c4 100644
--- a/src/android/camera_device.cpp
+++ b/src/android/camera_device.cpp
@@ -1319,12 +1319,26 @@ CameraMetadata *CameraDevice::requestTemplatePreview()
 	requestTemplate->addEntry(ANDROID_CONTROL_AE_LOCK,
 				  &aeLock, 1);
 
-	std::vector<int32_t> aeFpsTarget = {
-		15, 30,
-	};
-	requestTemplate->addEntry(ANDROID_CONTROL_AE_TARGET_FPS_RANGE,
-				  aeFpsTarget.data(),
-				  aeFpsTarget.size());
+	/* Get the FPS range registered in the static metadata. */
+	camera_metadata_ro_entry_t entry;
+	bool found = staticMetadata_->getEntry(ANDROID_CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES,
+					       &entry);
+	if (found) {
+		/*
+		 * \todo Depending on the requested CaptureIntent, the FPS range
+		 * needs to be adjusted. For example, the capture template for
+		 * video capture intent shall report a fixed value.
+		 *
+		 * Also assume the AE_AVAILABLE_TARGET_FPS_RANGE static metadata
+		 * has been assembled as {{min, max} {max, max}}.
+		 */
+		const int32_t *data = entry.data.i32;
+		std::vector<int32_t> aeFpsTarget = {
+			data[0], data[1],
+		};
+		requestTemplate->addEntry(ANDROID_CONTROL_AE_TARGET_FPS_RANGE,
+					  aeFpsTarget.data(), aeFpsTarget.size());
+	}
 
 	uint8_t aeAntibandingMode = ANDROID_CONTROL_AE_ANTIBANDING_MODE_AUTO;
 	requestTemplate->addEntry(ANDROID_CONTROL_AE_ANTIBANDING_MODE,
-- 
2.29.2