From 3088e14e814eb3bb25103de8f5402ef6b0211689 Mon Sep 17 00:00:00 2001
From: Harvey Yang <chenghaoyang@chromium.org>
Date: Wed, 25 Sep 2024 08:12:26 +0000
Subject: libcamera: android: Add face detection control support

Allow Android HAL adapter to pass the face detection metadata control to
the pipeline and also send face detection metadata to the camera client
if the pipeline generates it.

Signed-off-by: Yudhistira Erlandinata <yerlandinata@chromium.org>
Co-developed-by: Harvey Yang <chenghaoyang@chromium.org>
Signed-off-by: Harvey Yang <chenghaoyang@chromium.org>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Harvey Yang <chenghaoyang@chromium.org>
---
 src/android/camera_capabilities.cpp | 44 +++++++++++++++++++++++++++++++++----
 1 file changed, 40 insertions(+), 4 deletions(-)

(limited to 'src/android/camera_capabilities.cpp')

diff --git a/src/android/camera_capabilities.cpp b/src/android/camera_capabilities.cpp
index 71043e12..b161bc6b 100644
--- a/src/android/camera_capabilities.cpp
+++ b/src/android/camera_capabilities.cpp
@@ -11,6 +11,7 @@
 #include <array>
 #include <cmath>
 #include <map>
+#include <stdint.h>
 #include <type_traits>
 
 #include <hardware/camera3.h>
@@ -1176,11 +1177,46 @@ int CameraCapabilities::initializeStaticMetadata()
 				  maxFrameDuration_);
 
 	/* Statistics static metadata. */
-	uint8_t faceDetectMode = ANDROID_STATISTICS_FACE_DETECT_MODE_OFF;
-	staticMetadata_->addEntry(ANDROID_STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES,
-				  faceDetectMode);
-
 	int32_t maxFaceCount = 0;
+	auto iter = camera_->controls().find(controls::draft::FaceDetectMode.id());
+	if (iter != camera_->controls().end()) {
+		const ControlInfo &faceDetectCtrlInfo = iter->second;
+		std::vector<uint8_t> faceDetectModes;
+		bool hasFaceDetection = false;
+
+		for (const auto &value : faceDetectCtrlInfo.values()) {
+			int32_t mode = value.get<int32_t>();
+			uint8_t androidMode = 0;
+
+			switch (mode) {
+			case controls::draft::FaceDetectModeOff:
+				androidMode = ANDROID_STATISTICS_FACE_DETECT_MODE_OFF;
+				break;
+			case controls::draft::FaceDetectModeSimple:
+				androidMode = ANDROID_STATISTICS_FACE_DETECT_MODE_SIMPLE;
+				hasFaceDetection = true;
+				break;
+			default:
+				LOG(HAL, Fatal) << "Received invalid face detect mode: " << mode;
+			}
+			faceDetectModes.push_back(androidMode);
+		}
+		if (hasFaceDetection) {
+			/*
+			 * \todo Create new libcamera controls to query max
+			 * possible faces detected.
+			 */
+			maxFaceCount = 10;
+			staticMetadata_->addEntry(
+				ANDROID_STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES,
+				faceDetectModes.data(), faceDetectModes.size());
+		}
+	} else {
+		uint8_t faceDetectMode = ANDROID_STATISTICS_FACE_DETECT_MODE_OFF;
+		staticMetadata_->addEntry(ANDROID_STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES,
+					  faceDetectMode);
+	}
+
 	staticMetadata_->addEntry(ANDROID_STATISTICS_INFO_MAX_FACE_COUNT,
 				  maxFaceCount);
 
-- 
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