[libcamera-devel] [PATCH v4 1/1] android: hal: Add Camera3 HAL
Jacopo Mondi
jacopo at jmondi.org
Mon Aug 12 10:41:46 CEST 2019
Add libcamera Android Camera HALv3 implementation.
The initial camera HAL implementation supports the LIMITED hardware
level and uses statically defined metadata and camera characteristics.
Add a build option named 'android' and adjust the build system to
selectively compile the Android camera HAL and link it against the
required Android libraries.
Signed-off-by: Jacopo Mondi <jacopo at jmondi.org>
---
meson_options.txt | 5 +
src/android/camera3_hal.cpp | 111 ++++
src/android/camera_device.cpp | 831 +++++++++++++++++++++++++++++
src/android/camera_device.h | 71 +++
src/android/camera_hal_manager.cpp | 138 +++++
src/android/camera_hal_manager.h | 47 ++
src/android/camera_proxy.cpp | 194 +++++++
src/android/camera_proxy.h | 45 ++
src/android/meson.build | 8 +
src/android/thread_rpc.cpp | 42 ++
src/android/thread_rpc.h | 54 ++
src/libcamera/meson.build | 9 +
src/meson.build | 5 +-
13 files changed, 1559 insertions(+), 1 deletion(-)
create mode 100644 src/android/camera3_hal.cpp
create mode 100644 src/android/camera_device.cpp
create mode 100644 src/android/camera_device.h
create mode 100644 src/android/camera_hal_manager.cpp
create mode 100644 src/android/camera_hal_manager.h
create mode 100644 src/android/camera_proxy.cpp
create mode 100644 src/android/camera_proxy.h
create mode 100644 src/android/thread_rpc.cpp
create mode 100644 src/android/thread_rpc.h
diff --git a/meson_options.txt b/meson_options.txt
index 97efc85b4412..2d78b8d91f9c 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,3 +1,8 @@
+option('android',
+ type : 'boolean',
+ value : false,
+ description : 'Compile libcamera with Android Camera3 HAL interface')
+
option('documentation',
type : 'boolean',
description : 'Generate the project documentation')
diff --git a/src/android/camera3_hal.cpp b/src/android/camera3_hal.cpp
new file mode 100644
index 000000000000..8d2629ca356c
--- /dev/null
+++ b/src/android/camera3_hal.cpp
@@ -0,0 +1,111 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * camera3_hal.cpp - Android Camera HALv3 module
+ */
+
+#include <hardware/camera_common.h>
+
+#include "camera_hal_manager.h"
+#include "camera_proxy.h"
+#include "log.h"
+
+using namespace libcamera;
+
+LOG_DEFINE_CATEGORY(HAL)
+
+static CameraHalManager cameraManager;
+
+/*------------------------------------------------------------------------------
+ * Android Camera HAL callbacks
+ */
+
+static int hal_get_number_of_cameras(void)
+{
+ return cameraManager.numCameras();
+}
+
+static int hal_get_camera_info(int id, struct camera_info *info)
+{
+ return cameraManager.getCameraInfo(id, info);
+}
+
+static int hal_set_callbacks(const camera_module_callbacks_t *callbacks)
+{
+ return 0;
+}
+
+static int hal_open_legacy(const struct hw_module_t *module, const char *id,
+ uint32_t halVersion, struct hw_device_t **device)
+{
+ return -ENOSYS;
+}
+
+static int hal_set_torch_mode(const char *camera_id, bool enabled)
+{
+ return -ENOSYS;
+}
+
+/*
+ * First entry point of the camera HAL module.
+ *
+ * Initialize the HAL but does not open any camera device yet (see hal_dev_open)
+ */
+static int hal_init()
+{
+ LOG(HAL, Info) << "Initialising Android camera HAL";
+
+ cameraManager.init();
+
+ return 0;
+}
+
+/*------------------------------------------------------------------------------
+ * Android Camera Device
+ */
+
+static int hal_dev_open(const hw_module_t *module, const char *name,
+ hw_device_t **device)
+{
+ LOG(HAL, Debug) << "Open camera " << name;
+
+ int id = atoi(name);
+ CameraProxy *proxy = cameraManager.open(id, module);
+ if (!proxy) {
+ LOG(HAL, Error)
+ << "Failed to open camera module '" << id << "'";
+ return -ENODEV;
+ }
+
+ *device = &proxy->camera3Device()->common;
+
+ return 0;
+}
+
+static struct hw_module_methods_t hal_module_methods = {
+ .open = hal_dev_open,
+};
+
+camera_module_t HAL_MODULE_INFO_SYM = {
+ .common = {
+ .tag = HARDWARE_MODULE_TAG,
+ .module_api_version = CAMERA_MODULE_API_VERSION_2_4,
+ .hal_api_version = HARDWARE_HAL_API_VERSION,
+ .id = CAMERA_HARDWARE_MODULE_ID,
+ .name = "libcamera camera HALv3 module",
+ .author = "libcamera",
+ .methods = &hal_module_methods,
+ .dso = nullptr,
+ .reserved = {},
+ },
+
+ .get_number_of_cameras = hal_get_number_of_cameras,
+ .get_camera_info = hal_get_camera_info,
+ .set_callbacks = hal_set_callbacks,
+ .get_vendor_tag_ops = nullptr,
+ .open_legacy = hal_open_legacy,
+ .set_torch_mode = hal_set_torch_mode,
+ .init = hal_init,
+ .reserved = {},
+};
diff --git a/src/android/camera_device.cpp b/src/android/camera_device.cpp
new file mode 100644
index 000000000000..e2c1f2a246c8
--- /dev/null
+++ b/src/android/camera_device.cpp
@@ -0,0 +1,831 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * camera_device.cpp - libcamera Android Camera Device
+ */
+
+#include "camera_device.h"
+
+#include <system/camera_metadata.h>
+
+#include "log.h"
+
+#include "thread_rpc.h"
+
+using namespace libcamera;
+
+LOG_DECLARE_CATEGORY(HAL);
+
+/*
+ * \struct Camera3RequestDescriptor
+ *
+ * A utility structure that groups information about a capture request to be
+ * later re-used at request complete time to notify the framework.
+ */
+
+CameraDevice::Camera3RequestDescriptor::Camera3RequestDescriptor(
+ unsigned int frameNumber, unsigned int numBuffers)
+ : frameNumber(frameNumber), numBuffers(numBuffers)
+{
+ buffers = new camera3_stream_buffer_t[numBuffers];
+}
+
+CameraDevice::Camera3RequestDescriptor::~Camera3RequestDescriptor()
+{
+ delete[] buffers;
+}
+
+/*
+ * \class CameraDevice
+ *
+ * The CameraDevice class wraps a libcamera::Camera instance, and implements
+ * the camera_device_t interface by handling RPC requests received from its
+ * associated CameraProxy.
+ *
+ * It translate parameters and operations from Camera HALv3 API to the libcamera
+ * ones to provide static information for a Camera, create request templates
+ * for it, process capture requests and then deliver capture results back
+ * to the framework using the designated callbacks.
+ */
+
+CameraDevice::CameraDevice(unsigned int id, std::shared_ptr<Camera> &camera)
+ : running_(false), camera_(camera), staticMetadata_(nullptr),
+ requestTemplate_(nullptr)
+{
+ camera_->requestCompleted.connect(this, &CameraDevice::requestComplete);
+}
+
+CameraDevice::~CameraDevice()
+{
+ if (staticMetadata_)
+ free_camera_metadata(staticMetadata_);
+ staticMetadata_ = nullptr;
+
+ if (requestTemplate_)
+ free_camera_metadata(requestTemplate_);
+ requestTemplate_ = nullptr;
+}
+
+/*
+ * Handle RPC request received from the associated proxy.
+ */
+void CameraDevice::message(Message *message)
+{
+ if (message->type() != ThreadRpcMessage::type())
+ return Object::message(message);
+
+ ThreadRpcMessage *rpcMessage = static_cast<ThreadRpcMessage *>(message);
+ ThreadRpc *rpc = rpcMessage->rpc;
+
+ switch (rpc->tag) {
+ case ThreadRpc::ProcessCaptureRequest:
+ processCaptureRequest(rpc->request);
+ break;
+ case ThreadRpc::Close:
+ close();
+ break;
+ default:
+ LOG(HAL, Error) << "Unknown RPC operation: " << rpc->tag;
+ }
+
+ rpc->notifyReception();
+}
+
+int CameraDevice::open()
+{
+ int ret = camera_->acquire();
+ if (ret) {
+ LOG(HAL, Error) << "Failed to acquire the camera";
+ return ret;
+ }
+
+ return 0;
+}
+
+void CameraDevice::close()
+{
+ camera_->stop();
+
+ camera_->freeBuffers();
+ camera_->release();
+
+ running_ = false;
+}
+
+void CameraDevice::setCallbacks(const camera3_callback_ops_t *callbacks)
+{
+ callbacks_ = callbacks;
+}
+
+/*
+ * Return static information for the camera.
+ */
+camera_metadata_t *CameraDevice::getStaticMetadata()
+{
+ int ret;
+
+ if (staticMetadata_)
+ return staticMetadata_;
+
+ /*
+ * The here reported metadata are enough to implement a basic capture
+ * example application, but a real camera implementation will require
+ * more.
+ */
+
+ /* \todo Use correct sizes */
+ #define STATIC_ENTRY_CAP 256
+ #define STATIC_DATA_CAP 6688
+ camera_metadata_t *staticMetadata =
+ allocate_camera_metadata(STATIC_ENTRY_CAP, STATIC_DATA_CAP);
+
+ /* Sensor static metadata. */
+ int32_t pixelArraySize[] = {
+ 2592, 1944,
+ };
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_SENSOR_INFO_PIXEL_ARRAY_SIZE,
+ &pixelArraySize, 2);
+ METADATA_ASSERT(ret);
+
+ int32_t sensorSizes[] = {
+ 0, 0, 2560, 1920,
+ };
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_SENSOR_INFO_ACTIVE_ARRAY_SIZE,
+ &sensorSizes, 4);
+ METADATA_ASSERT(ret);
+
+ int32_t sensitivityRange[] = {
+ 32, 2400,
+ };
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_SENSOR_INFO_SENSITIVITY_RANGE,
+ &sensitivityRange, 2);
+ METADATA_ASSERT(ret);
+
+ uint16_t filterArr = ANDROID_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT_GRBG;
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT,
+ &filterArr, 1);
+ METADATA_ASSERT(ret);
+
+ int64_t exposureTimeRange[] = {
+ 100000, 200000000,
+ };
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_SENSOR_INFO_EXPOSURE_TIME_RANGE,
+ &exposureTimeRange, 2);
+ METADATA_ASSERT(ret);
+
+ int32_t orientation = 0;
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_SENSOR_ORIENTATION,
+ &orientation, 1);
+ METADATA_ASSERT(ret);
+
+ /* Flash static metadata. */
+ char flashAvailable = ANDROID_FLASH_INFO_AVAILABLE_FALSE;
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_FLASH_INFO_AVAILABLE,
+ &flashAvailable, 1);
+ METADATA_ASSERT(ret);
+
+ /* Lens static metadata. */
+ float fn = 2.53 / 100;
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_LENS_INFO_AVAILABLE_APERTURES, &fn, 1);
+ METADATA_ASSERT(ret);
+
+ /* Control metadata. */
+ char controlMetadata = ANDROID_CONTROL_MODE_AUTO;
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_CONTROL_AVAILABLE_MODES,
+ &controlMetadata, 1);
+ METADATA_ASSERT(ret);
+
+ char availableAntiBandingModes[] = {
+ ANDROID_CONTROL_AE_ANTIBANDING_MODE_OFF,
+ ANDROID_CONTROL_AE_ANTIBANDING_MODE_50HZ,
+ ANDROID_CONTROL_AE_ANTIBANDING_MODE_60HZ,
+ ANDROID_CONTROL_AE_ANTIBANDING_MODE_AUTO,
+ };
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_CONTROL_AE_AVAILABLE_ANTIBANDING_MODES,
+ availableAntiBandingModes, 4);
+ METADATA_ASSERT(ret);
+
+ char aeAvailableModes[] = {
+ ANDROID_CONTROL_AE_MODE_ON,
+ ANDROID_CONTROL_AE_MODE_OFF,
+ };
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_CONTROL_AE_AVAILABLE_MODES,
+ aeAvailableModes, 2);
+ METADATA_ASSERT(ret);
+
+ controlMetadata = ANDROID_CONTROL_AE_LOCK_AVAILABLE_TRUE;
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_CONTROL_AE_LOCK_AVAILABLE,
+ &controlMetadata, 1);
+ METADATA_ASSERT(ret);
+
+ uint8_t awbLockAvailable = ANDROID_CONTROL_AWB_LOCK_AVAILABLE_FALSE;
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_CONTROL_AWB_LOCK_AVAILABLE,
+ &awbLockAvailable, 1);
+
+ /* Scaler static metadata. */
+ std::vector<uint32_t> availableStreamFormats = {
+ ANDROID_SCALER_AVAILABLE_FORMATS_BLOB,
+ ANDROID_SCALER_AVAILABLE_FORMATS_YCbCr_420_888,
+ ANDROID_SCALER_AVAILABLE_FORMATS_IMPLEMENTATION_DEFINED,
+ };
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_SCALER_AVAILABLE_FORMATS,
+ availableStreamFormats.data(),
+ availableStreamFormats.size());
+ METADATA_ASSERT(ret);
+
+ std::vector<uint32_t> availableStreamConfigurations = {
+ ANDROID_SCALER_AVAILABLE_FORMATS_BLOB, 2560, 1920,
+ ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS_OUTPUT,
+ ANDROID_SCALER_AVAILABLE_FORMATS_YCbCr_420_888, 2560, 1920,
+ ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS_OUTPUT,
+ ANDROID_SCALER_AVAILABLE_FORMATS_IMPLEMENTATION_DEFINED, 2560, 1920,
+ ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS_OUTPUT,
+ };
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS,
+ availableStreamConfigurations.data(),
+ availableStreamConfigurations.size());
+ METADATA_ASSERT(ret);
+
+ std::vector<int64_t> availableStallDurations = {
+ ANDROID_SCALER_AVAILABLE_FORMATS_BLOB, 2560, 1920, 33333333,
+ };
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_SCALER_AVAILABLE_STALL_DURATIONS,
+ availableStallDurations.data(),
+ availableStallDurations.size());
+ METADATA_ASSERT(ret);
+
+ std::vector<int64_t> minFrameDurations = {
+ ANDROID_SCALER_AVAILABLE_FORMATS_BLOB, 2560, 1920, 33333333,
+ ANDROID_SCALER_AVAILABLE_FORMATS_IMPLEMENTATION_DEFINED, 2560, 1920, 33333333,
+ ANDROID_SCALER_AVAILABLE_FORMATS_YCbCr_420_888, 2560, 1920, 33333333,
+ };
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_SCALER_AVAILABLE_MIN_FRAME_DURATIONS,
+ minFrameDurations.data(), minFrameDurations.size());
+ METADATA_ASSERT(ret);
+
+ /* Info static metadata. */
+ uint8_t supportedHWLevel = ANDROID_INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED;
+ ret = add_camera_metadata_entry(staticMetadata,
+ ANDROID_INFO_SUPPORTED_HARDWARE_LEVEL,
+ &supportedHWLevel, 1);
+
+ return staticMetadata;
+}
+
+/*
+ * Produce a metadata pack to be used as template for a capture request.
+ */
+const camera_metadata_t *CameraDevice::constructDefaultRequestSettings(int type)
+{
+ int ret;
+
+ /*
+ * \todo Inspect type and pick the right metadata pack.
+ * As of now just use a single one for all templates.
+ */
+ uint8_t captureIntent;
+ switch (type) {
+ case CAMERA3_TEMPLATE_PREVIEW:
+ captureIntent = ANDROID_CONTROL_CAPTURE_INTENT_PREVIEW;
+ break;
+ case CAMERA3_TEMPLATE_STILL_CAPTURE:
+ captureIntent = ANDROID_CONTROL_CAPTURE_INTENT_STILL_CAPTURE;
+ break;
+ case CAMERA3_TEMPLATE_VIDEO_RECORD:
+ captureIntent = ANDROID_CONTROL_CAPTURE_INTENT_VIDEO_RECORD;
+ break;
+ case CAMERA3_TEMPLATE_VIDEO_SNAPSHOT:
+ captureIntent = ANDROID_CONTROL_CAPTURE_INTENT_VIDEO_SNAPSHOT;
+ break;
+ case CAMERA3_TEMPLATE_ZERO_SHUTTER_LAG:
+ captureIntent = ANDROID_CONTROL_CAPTURE_INTENT_ZERO_SHUTTER_LAG;
+ break;
+ case CAMERA3_TEMPLATE_MANUAL:
+ captureIntent = ANDROID_CONTROL_CAPTURE_INTENT_MANUAL;
+ break;
+ default:
+ LOG(HAL, Error) << "Invalid template request type: " << type;
+ return nullptr;
+ }
+
+ if (requestTemplate_)
+ return requestTemplate_;
+
+ /* \todo Use correct sizes */
+ #define REQUEST_TEMPLATE_ENTRIES 30
+ #define REQUEST_TEMPLATE_DATA 2048
+ requestTemplate_ = allocate_camera_metadata(REQUEST_TEMPLATE_ENTRIES,
+ REQUEST_TEMPLATE_DATA);
+ if (!requestTemplate_) {
+ LOG(HAL, Error) << "Failed to allocate template metadata";
+ return nullptr;
+ }
+
+ /* Set to 0 the number of 'processed and stalling' streams (ie JPEG). */
+ int32_t maxOutStream[] = { 0, 2, 0 };
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_REQUEST_MAX_NUM_OUTPUT_STREAMS,
+ maxOutStream, 3);
+ METADATA_ASSERT(ret);
+
+ uint8_t maxPipelineDepth = 5;
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_REQUEST_PIPELINE_MAX_DEPTH,
+ &maxPipelineDepth, 1);
+ METADATA_ASSERT(ret);
+
+ int32_t inputStreams = 0;
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_REQUEST_MAX_NUM_INPUT_STREAMS,
+ &inputStreams, 1);
+ METADATA_ASSERT(ret);
+
+ int32_t partialResultCount = 1;
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_REQUEST_PARTIAL_RESULT_COUNT,
+ &partialResultCount, 1);
+ METADATA_ASSERT(ret);
+
+ uint8_t availableCapabilities[] = {
+ ANDROID_REQUEST_AVAILABLE_CAPABILITIES_BACKWARD_COMPATIBLE,
+ };
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_REQUEST_AVAILABLE_CAPABILITIES,
+ availableCapabilities, 1);
+ METADATA_ASSERT(ret);
+
+ uint8_t aeMode = ANDROID_CONTROL_AE_MODE_ON;
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_CONTROL_AE_MODE,
+ &aeMode, 1);
+ METADATA_ASSERT(ret);
+
+ int32_t aeExposureCompensation = 0;
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_CONTROL_AE_EXPOSURE_COMPENSATION,
+ &aeExposureCompensation, 1);
+ METADATA_ASSERT(ret);
+
+ uint8_t aePrecaptureTrigger = ANDROID_CONTROL_AE_PRECAPTURE_TRIGGER_IDLE;
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_CONTROL_AE_PRECAPTURE_TRIGGER,
+ &aePrecaptureTrigger, 1);
+ METADATA_ASSERT(ret);
+
+ uint8_t aeLock = ANDROID_CONTROL_AE_LOCK_OFF;
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_CONTROL_AE_LOCK,
+ &aeLock, 1);
+ METADATA_ASSERT(ret);
+
+ uint8_t afTrigger = ANDROID_CONTROL_AF_TRIGGER_IDLE;
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_CONTROL_AF_TRIGGER,
+ &afTrigger, 1);
+ METADATA_ASSERT(ret);
+
+ uint8_t awbMode = ANDROID_CONTROL_AWB_MODE_AUTO;
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_CONTROL_AWB_MODE,
+ &awbMode, 1);
+ METADATA_ASSERT(ret);
+
+ uint8_t awbLock = ANDROID_CONTROL_AWB_LOCK_OFF;
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_CONTROL_AWB_LOCK,
+ &awbLock, 1);
+ METADATA_ASSERT(ret);
+
+ uint8_t awbLockAvailable = ANDROID_CONTROL_AWB_LOCK_AVAILABLE_FALSE;
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_CONTROL_AWB_LOCK_AVAILABLE,
+ &awbLockAvailable, 1);
+ METADATA_ASSERT(ret);
+
+ uint8_t flashMode = ANDROID_FLASH_MODE_OFF;
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_FLASH_MODE,
+ &flashMode, 1);
+ METADATA_ASSERT(ret);
+
+ uint8_t faceDetectMode = ANDROID_STATISTICS_FACE_DETECT_MODE_OFF;
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_STATISTICS_FACE_DETECT_MODE,
+ &faceDetectMode, 1);
+ METADATA_ASSERT(ret);
+
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_CONTROL_CAPTURE_INTENT,
+ &captureIntent, 1);
+ METADATA_ASSERT(ret);
+
+ /*
+ * This is quite hard to list at the moment wihtout knowing what
+ * we could control.
+ *
+ * For now, just list in the available Request keys and in the available
+ * result keys the control and reporting of the AE algorithm.
+ */
+ std::vector<int32_t> availableRequestKeys = {
+ ANDROID_CONTROL_AE_MODE,
+ ANDROID_CONTROL_AE_EXPOSURE_COMPENSATION,
+ ANDROID_CONTROL_AE_PRECAPTURE_TRIGGER,
+ ANDROID_CONTROL_AE_LOCK,
+ ANDROID_CONTROL_AF_TRIGGER,
+ ANDROID_CONTROL_AWB_MODE,
+ ANDROID_CONTROL_AWB_LOCK,
+ ANDROID_CONTROL_AWB_LOCK_AVAILABLE,
+ ANDROID_CONTROL_CAPTURE_INTENT,
+ ANDROID_FLASH_MODE,
+ ANDROID_STATISTICS_FACE_DETECT_MODE,
+ };
+
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_REQUEST_AVAILABLE_REQUEST_KEYS,
+ availableRequestKeys.data(),
+ availableRequestKeys.size());
+ METADATA_ASSERT(ret);
+
+ std::vector<int32_t> availableResultKeys = {
+ ANDROID_CONTROL_AE_MODE,
+ ANDROID_CONTROL_AE_EXPOSURE_COMPENSATION,
+ ANDROID_CONTROL_AE_PRECAPTURE_TRIGGER,
+ ANDROID_CONTROL_AE_LOCK,
+ ANDROID_CONTROL_AF_TRIGGER,
+ ANDROID_CONTROL_AWB_MODE,
+ ANDROID_CONTROL_AWB_LOCK,
+ ANDROID_CONTROL_AWB_LOCK_AVAILABLE,
+ ANDROID_CONTROL_CAPTURE_INTENT,
+ ANDROID_FLASH_MODE,
+ ANDROID_STATISTICS_FACE_DETECT_MODE,
+ };
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_REQUEST_AVAILABLE_RESULT_KEYS,
+ availableResultKeys.data(),
+ availableResultKeys.size());
+ METADATA_ASSERT(ret);
+
+ /*
+ * \todo The available characteristics are be the tags reported
+ * as part of the static metadata reported at hal_get_camera_info()
+ * time. As of now, report an empty list.
+ */
+ std::vector<int32_t> availableCharacteristicsKeys = {};
+ ret = add_camera_metadata_entry(requestTemplate_,
+ ANDROID_REQUEST_AVAILABLE_CHARACTERISTICS_KEYS,
+ availableCharacteristicsKeys.data(),
+ availableCharacteristicsKeys.size());
+ METADATA_ASSERT(ret);
+
+ return requestTemplate_;
+}
+
+/*
+ * Inspect the stream_list to produce a list of StreamConfiguration to
+ * be use to configure the Camera.
+ */
+int CameraDevice::configureStreams(camera3_stream_configuration_t *stream_list)
+{
+ for (unsigned int i = 0; i < stream_list->num_streams; ++i) {
+ camera3_stream_t *stream = stream_list->streams[i];
+
+ LOG(HAL, Info) << "Stream #" << i
+ << ", direction: " << stream->stream_type
+ << ", width: " << stream->width
+ << ", height: " << stream->height
+ << ", format: " << std::hex << stream->format;
+ }
+
+ /* Hardcode viewfinder role, collecting sizes from the stream config. */
+ if (stream_list->num_streams != 1) {
+ LOG(HAL, Error) << "Only one stream supported";
+ return -EINVAL;
+ }
+
+ StreamRoles roles = { StreamRole::Viewfinder };
+ config_ = camera_->generateConfiguration(roles);
+ if (!config_ || config_->empty()) {
+ LOG(HAL, Error) << "Failed to generate camera configuration";
+ return -EINVAL;
+ }
+
+ /* Only one stream is supported. */
+ camera3_stream_t *camera3Stream = stream_list->streams[0];
+ StreamConfiguration *streamConfiguration = &config_->at(0);
+ streamConfiguration->size.width = camera3Stream->width;
+ streamConfiguration->size.height = camera3Stream->height;
+ streamConfiguration->memoryType = ExternalMemory;
+
+ /*
+ * \todo We'll need to translate from Android defined pixel format codes
+ * to the libcamera image format codes. For now, do not change the
+ * format returned from Camera::generateConfiguration().
+ */
+
+ switch (config_->validate()) {
+ case CameraConfiguration::Valid:
+ break;
+ case CameraConfiguration::Adjusted:
+ LOG(HAL, Info) << "Camera configuration adjusted";
+ config_.reset();
+ return -EINVAL;
+ case CameraConfiguration::Invalid:
+ LOG(HAL, Info) << "Camera configuration invalid";
+ config_.reset();
+ return -EINVAL;
+ }
+
+ camera3Stream->max_buffers = streamConfiguration->bufferCount;
+
+ /*
+ * Once the CameraConfiguration has been adjusted/validated
+ * it can be applied to the camera.
+ */
+ int ret = camera_->configure(config_.get());
+ if (ret) {
+ LOG(HAL, Error) << "Failed to configure camera '"
+ << camera_->name() << "'";
+ return ret;
+ }
+
+ return 0;
+}
+
+int CameraDevice::processCaptureRequest(camera3_capture_request_t *camera3Request)
+{
+ StreamConfiguration *streamConfiguration = &config_->at(0);
+ Stream *stream = streamConfiguration->stream();
+
+ if (camera3Request->num_output_buffers != 1) {
+ LOG(HAL, Error) << "Invalid number of output buffers: "
+ << camera3Request->num_output_buffers;
+ return -EINVAL;
+ }
+
+ /* Start the camera if that's the first request we handle. */
+ if (!running_) {
+ int ret = camera_->allocateBuffers();
+ if (ret) {
+ LOG(HAL, Error) << "Failed to allocate buffers";
+ return ret;
+ }
+
+ ret = camera_->start();
+ if (ret) {
+ LOG(HAL, Error) << "Failed to start camera";
+ camera_->freeBuffers();
+ return ret;
+ }
+
+ running_ = true;
+ }
+
+ /*
+ * Queue a request for the Camera with the provided dmabuf file
+ * descriptors.
+ */
+ const camera3_stream_buffer_t *camera3Buffers =
+ camera3Request->output_buffers;
+
+ /*
+ * Save the request descriptors for use at completion time.
+ * The descriptor and the associated memory reserved here are freed
+ * at request complete time.
+ */
+ Camera3RequestDescriptor *descriptor =
+ new Camera3RequestDescriptor(camera3Request->frame_number,
+ camera3Request->num_output_buffers);
+ for (unsigned int i = 0; i < descriptor->numBuffers; ++i) {
+ /*
+ * Keep track of which stream the request belongs to and store
+ * the native buffer handles.
+ *
+ * \todo Currently we only support one capture buffer. Copy
+ * all of them to be ready once we'll support more.
+ */
+ descriptor->buffers[i].stream = camera3Buffers[i].stream;
+ descriptor->buffers[i].buffer = camera3Buffers[i].buffer;
+ }
+
+ /*
+ * Create a libcamera buffer using the dmabuf descriptors of the first
+ * and (currently) only supported request buffer.
+ */
+ const buffer_handle_t camera3Handle = *camera3Buffers[0].buffer;
+ std::array<int, 3> fds = {
+ camera3Handle->data[0],
+ camera3Handle->data[1],
+ camera3Handle->data[2],
+ };
+
+ std::unique_ptr<Buffer> buffer = stream->createBuffer(fds);
+ if (!buffer) {
+ LOG(HAL, Error) << "Failed to create buffer";
+ delete descriptor;
+ return -EINVAL;
+ }
+
+ Request *request =
+ camera_->createRequest(reinterpret_cast<uint64_t>(descriptor));
+ request->addBuffer(std::move(buffer));
+
+ int ret = camera_->queueRequest(request);
+ if (ret) {
+ LOG(HAL, Error) << "Failed to queue request";
+ goto error;
+ }
+
+ return 0;
+
+error:
+ delete request;
+ delete descriptor;
+
+ return ret;
+}
+
+void CameraDevice::requestComplete(Request *request,
+ const std::map<Stream *, Buffer *> &buffers)
+{
+ Buffer *libcameraBuffer = buffers.begin()->second;
+ camera3_buffer_status status = CAMERA3_BUFFER_STATUS_OK;
+ camera_metadata_t *resultMetadata = nullptr;
+
+ if (request->status() != Request::RequestComplete) {
+ LOG(HAL, Error) << "Request not succesfully completed: "
+ << request->status();
+ status = CAMERA3_BUFFER_STATUS_ERROR;
+ }
+
+ /* Prepare to call back the Android camera stack. */
+ Camera3RequestDescriptor *descriptor =
+ reinterpret_cast<Camera3RequestDescriptor *>(request->cookie());
+
+ camera3_capture_result_t captureResult = {};
+ captureResult.frame_number = descriptor->frameNumber;
+ captureResult.num_output_buffers = descriptor->numBuffers;
+ for (unsigned int i = 0; i < descriptor->numBuffers; ++i) {
+ /*
+ * \todo Currently we only support one capture buffer. Prepare
+ * all of them to be ready once we'll support more.
+ */
+ descriptor->buffers[i].acquire_fence = -1;
+ descriptor->buffers[i].release_fence = -1;
+ descriptor->buffers[i].status = status;
+ }
+ captureResult.output_buffers =
+ const_cast<const camera3_stream_buffer_t *>(descriptor->buffers);
+
+ if (status == CAMERA3_BUFFER_STATUS_ERROR) {
+ /* \todo Improve error handling. */
+ notifyError(descriptor->frameNumber,
+ descriptor->buffers[0].stream);
+ } else {
+ notifyShutter(descriptor->frameNumber,
+ libcameraBuffer->timestamp());
+
+ captureResult.partial_result = 1;
+ resultMetadata = getResultMetadata(descriptor->frameNumber,
+ libcameraBuffer->timestamp());
+ captureResult.result = resultMetadata;
+ }
+
+ callbacks_->process_capture_result(callbacks_, &captureResult);
+
+ delete descriptor;
+ if (resultMetadata)
+ free_camera_metadata(resultMetadata);
+
+ return;
+}
+
+void CameraDevice::notifyShutter(uint32_t frameNumber, uint64_t timestamp)
+{
+ camera3_notify_msg_t notify = {};
+
+ notify.type = CAMERA3_MSG_SHUTTER;
+ notify.message.shutter.frame_number = frameNumber;
+ notify.message.shutter.timestamp = timestamp;
+
+ callbacks_->notify(callbacks_, ¬ify);
+}
+
+void CameraDevice::notifyError(uint32_t frameNumber, camera3_stream_t *stream)
+{
+ camera3_notify_msg_t notify = {};
+
+ notify.type = CAMERA3_MSG_ERROR;
+ notify.message.error.error_stream = stream;
+ notify.message.error.frame_number = frameNumber;
+ notify.message.error.error_code = CAMERA3_MSG_ERROR_REQUEST;
+
+ callbacks_->notify(callbacks_, ¬ify);
+}
+
+/*
+ * Produce a set of fixed result metadata.
+ */
+camera_metadata_t *CameraDevice::getResultMetadata(int frame_number,
+ int64_t timestamp)
+{
+ int ret;
+
+ /* \todo Use correct sizes */
+ #define RESULT_ENTRY_CAP 256
+ #define RESULT_DATA_CAP 6688
+ camera_metadata_t *resultMetadata =
+ allocate_camera_metadata(STATIC_ENTRY_CAP, STATIC_DATA_CAP);
+
+ const uint8_t ae_state = ANDROID_CONTROL_AE_STATE_CONVERGED;
+ ret = add_camera_metadata_entry(resultMetadata, ANDROID_CONTROL_AE_STATE,
+ &ae_state, 1);
+ METADATA_ASSERT(ret);
+
+ const uint8_t ae_lock = ANDROID_CONTROL_AE_LOCK_OFF;
+ ret = add_camera_metadata_entry(resultMetadata, ANDROID_CONTROL_AE_LOCK,
+ &ae_lock, 1);
+ METADATA_ASSERT(ret);
+
+ uint8_t af_state = ANDROID_CONTROL_AF_STATE_INACTIVE;
+ ret = add_camera_metadata_entry(resultMetadata, ANDROID_CONTROL_AF_STATE,
+ &af_state, 1);
+ METADATA_ASSERT(ret);
+
+ const uint8_t awb_state = ANDROID_CONTROL_AWB_STATE_CONVERGED;
+ ret = add_camera_metadata_entry(resultMetadata,
+ ANDROID_CONTROL_AWB_STATE,
+ &awb_state, 1);
+ METADATA_ASSERT(ret);
+
+ const uint8_t awb_lock = ANDROID_CONTROL_AWB_LOCK_OFF;
+ ret = add_camera_metadata_entry(resultMetadata,
+ ANDROID_CONTROL_AWB_LOCK,
+ &awb_lock, 1);
+ METADATA_ASSERT(ret);
+
+ const uint8_t lens_state = ANDROID_LENS_STATE_STATIONARY;
+ ret = add_camera_metadata_entry(resultMetadata,
+ ANDROID_LENS_STATE,
+ &lens_state, 1);
+ METADATA_ASSERT(ret);
+
+ int32_t sensorSizes[] = {
+ 0, 0, 2560, 1920,
+ };
+ ret = add_camera_metadata_entry(resultMetadata,
+ ANDROID_SCALER_CROP_REGION,
+ sensorSizes, 4);
+ METADATA_ASSERT(ret);
+
+ ret = add_camera_metadata_entry(resultMetadata,
+ ANDROID_SENSOR_TIMESTAMP,
+ ×tamp, 1);
+ METADATA_ASSERT(ret);
+
+ /* 33.3 msec */
+ const int64_t rolling_shutter_skew = 33300000;
+ ret = add_camera_metadata_entry(resultMetadata,
+ ANDROID_SENSOR_ROLLING_SHUTTER_SKEW,
+ &rolling_shutter_skew, 1);
+ METADATA_ASSERT(ret);
+
+ /* 16.6 msec */
+ const int64_t exposure_time = 16600000;
+ ret = add_camera_metadata_entry(resultMetadata,
+ ANDROID_SENSOR_EXPOSURE_TIME,
+ &exposure_time, 1);
+ METADATA_ASSERT(ret);
+
+ const uint8_t lens_shading_map_mode =
+ ANDROID_STATISTICS_LENS_SHADING_MAP_MODE_OFF;
+ ret = add_camera_metadata_entry(resultMetadata,
+ ANDROID_STATISTICS_LENS_SHADING_MAP_MODE,
+ &lens_shading_map_mode, 1);
+ METADATA_ASSERT(ret);
+
+ const uint8_t scene_flicker = ANDROID_STATISTICS_SCENE_FLICKER_NONE;
+ ret = add_camera_metadata_entry(resultMetadata,
+ ANDROID_STATISTICS_SCENE_FLICKER,
+ &scene_flicker, 1);
+ METADATA_ASSERT(ret);
+
+ return resultMetadata;
+}
diff --git a/src/android/camera_device.h b/src/android/camera_device.h
new file mode 100644
index 000000000000..ac5b95c95104
--- /dev/null
+++ b/src/android/camera_device.h
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * camera_device.h - libcamera Android Camera Device
+ */
+#ifndef __ANDROID_CAMERA_DEVICE_H__
+#define __ANDROID_CAMERA_DEVICE_H__
+
+#include <memory>
+
+#include <hardware/camera3.h>
+
+#include <libcamera/buffer.h>
+#include <libcamera/camera.h>
+#include <libcamera/object.h>
+#include <libcamera/request.h>
+#include <libcamera/stream.h>
+
+#include "message.h"
+
+#define METADATA_ASSERT(_r) \
+ do { \
+ if (!(_r)) break; \
+ LOG(HAL, Error) << "Error: " << __func__ << ":" << __LINE__; \
+ return nullptr; \
+ } while(0);
+
+class CameraDevice : public libcamera::Object
+{
+public:
+ CameraDevice(unsigned int id, std::shared_ptr<libcamera::Camera> &camera);
+ ~CameraDevice();
+
+ void message(libcamera::Message *message);
+
+ int open();
+ void close();
+ void setCallbacks(const camera3_callback_ops_t *callbacks);
+ camera_metadata_t *getStaticMetadata();
+ const camera_metadata_t *constructDefaultRequestSettings(int type);
+ int configureStreams(camera3_stream_configuration_t *stream_list);
+ int processCaptureRequest(camera3_capture_request_t *request);
+ void requestComplete(libcamera::Request *request,
+ const std::map<libcamera::Stream *, libcamera::Buffer *> &buffers);
+
+private:
+ struct Camera3RequestDescriptor {
+ Camera3RequestDescriptor(unsigned int frameNumber,
+ unsigned int numBuffers);
+ ~Camera3RequestDescriptor();
+
+ uint32_t frameNumber;
+ uint32_t numBuffers;
+ camera3_stream_buffer_t *buffers;
+ };
+
+ void notifyShutter(uint32_t frameNumber, uint64_t timestamp);
+ void notifyError(uint32_t frameNumber, camera3_stream_t *stream);
+ camera_metadata_t *getResultMetadata(int frame_number, int64_t timestamp);
+
+ bool running_;
+ std::shared_ptr<libcamera::Camera> camera_;
+ std::unique_ptr<libcamera::CameraConfiguration> config_;
+
+ camera_metadata_t *staticMetadata_;
+ camera_metadata_t *requestTemplate_;
+ const camera3_callback_ops_t *callbacks_;
+};
+
+#endif /* __ANDROID_CAMERA_DEVICE_H__ */
diff --git a/src/android/camera_hal_manager.cpp b/src/android/camera_hal_manager.cpp
new file mode 100644
index 000000000000..08c759dfd8a1
--- /dev/null
+++ b/src/android/camera_hal_manager.cpp
@@ -0,0 +1,138 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * camera_hal_manager.cpp - libcamera Android Camera Manager
+ */
+
+#include "camera_hal_manager.h"
+
+#include <libcamera/camera.h>
+
+#include "log.h"
+
+#include "camera_device.h"
+#include "camera_proxy.h"
+
+using namespace libcamera;
+
+LOG_DECLARE_CATEGORY(HAL);
+
+/*
+ * \class CameraHalManager
+ *
+ * The HAL camera manager is initializated at camera_module_t 'hal_init()' time
+ * and spawns its own thread where libcamera related events are dispatched to.
+ * It wraps the libcamera CameraManager operations and provides helpers for the
+ * camera_module_t operations, to retrieve the number of cameras in the system,
+ * their static information and to open and close camera devices.
+ */
+
+int CameraHalManager::init()
+{
+ /*
+ * Start the camera HAL manager thread and wait until its
+ * initialisation completes to be fully operational before
+ * receiving calls from the camera stack.
+ */
+ start();
+
+ MutexLocker locker(mutex_);
+ cv_.wait(locker);
+
+ return 0;
+}
+
+void CameraHalManager::run()
+{
+ /*
+ * All the libcamera components must be initialised here, in
+ * order to bind them to the camera HAL manager thread that
+ * executes the event dispatcher.
+ */
+ cameraManager_ = libcamera::CameraManager::instance();
+
+ int ret = cameraManager_->start();
+ if (ret) {
+ LOG(HAL, Error) << "Failed to start camera manager: "
+ << strerror(-ret);
+ return;
+ }
+
+ /*
+ * For each Camera registered in the system, a CameraProxy
+ * gets created here to wraps a camera device.
+ *
+ * \todo Support camera hotplug.
+ */
+ unsigned int index = 0;
+ for (auto &camera : cameraManager_->cameras()) {
+ CameraProxy *proxy = new CameraProxy(index, camera);
+ proxies_.emplace_back(proxy);
+
+ ++index;
+ }
+
+ /*
+ * libcamera has been initialized. Unlock the init() caller
+ * as we're now ready to handle calls from the framework.
+ */
+ cv_.notify_one();
+
+ /* Now start processing events and messages. */
+ exec();
+}
+
+CameraProxy *CameraHalManager::open(unsigned int id,
+ const hw_module_t *hardwareModule)
+{
+ if (id < 0 || id >= numCameras()) {
+ LOG(HAL, Error) << "Invalid camera id '" << id << "'";
+ return nullptr;
+ }
+
+ CameraProxy *proxy = proxies_[id].get();
+ if (proxy->open(hardwareModule))
+ return nullptr;
+
+ LOG(HAL, Info) << "Open camera '" << id << "'";
+
+ return proxy;
+}
+
+int CameraHalManager::close(CameraProxy *proxy)
+{
+ proxy->close();
+ LOG(HAL, Info) << "Close camera '" << proxy->id() << "'";
+
+ return 0;
+}
+
+unsigned int CameraHalManager::numCameras() const
+{
+ return cameraManager_->cameras().size();
+}
+
+int CameraHalManager::getCameraInfo(int id, struct camera_info *info)
+{
+ if (!info)
+ return -EINVAL;
+
+ if (id >= numCameras() || id < 0) {
+ LOG(HAL, Error) << "Invalid camera id '" << id << "'";
+ return -EINVAL;
+ }
+
+ CameraProxy *proxy = proxies_[id].get();
+
+ /* \todo Get these info dynamically inspecting the camera module. */
+ info->facing = id ? CAMERA_FACING_FRONT : CAMERA_FACING_BACK;
+ info->orientation = 0;
+ info->device_version = 0;
+ info->resource_cost = 0;
+ info->static_camera_characteristics = proxy->getStaticMetadata();
+ info->conflicting_devices = nullptr;
+ info->conflicting_devices_length = 0;
+
+ return 0;
+}
diff --git a/src/android/camera_hal_manager.h b/src/android/camera_hal_manager.h
new file mode 100644
index 000000000000..8004aaf660f5
--- /dev/null
+++ b/src/android/camera_hal_manager.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * camera_hal_manager.h - libcamera Android Camera Manager
+ */
+#ifndef __ANDROID_CAMERA_MANAGER_H__
+#define __ANDROID_CAMERA_MANAGER_H__
+
+#include <condition_variable>
+#include <mutex>
+#include <vector>
+
+#include <hardware/hardware.h>
+#include <system/camera_metadata.h>
+
+#include <libcamera/camera_manager.h>
+
+#include "thread.h"
+
+class CameraDevice;
+class CameraProxy;
+
+class CameraHalManager : public libcamera::Thread
+{
+public:
+ int init();
+
+ CameraProxy *open(unsigned int id, const hw_module_t *module);
+ int close(CameraProxy *proxy);
+
+ unsigned int numCameras() const;
+ int getCameraInfo(int id, struct camera_info *info);
+
+private:
+ void run() override;
+ camera_metadata_t *getStaticMetadata(unsigned int id);
+
+ libcamera::CameraManager *cameraManager_;
+
+ std::mutex mutex_;
+ std::condition_variable cv_;
+
+ std::vector<std::unique_ptr<CameraProxy>> proxies_;
+};
+
+#endif /* __ANDROID_CAMERA_MANAGER_H__ */
diff --git a/src/android/camera_proxy.cpp b/src/android/camera_proxy.cpp
new file mode 100644
index 000000000000..f0cacac8025b
--- /dev/null
+++ b/src/android/camera_proxy.cpp
@@ -0,0 +1,194 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * camera_proxy.cpp - Proxy to camera devices
+ */
+
+#include "camera_proxy.h"
+
+#include <system/camera_metadata.h>
+
+#include "log.h"
+#include "message.h"
+#include "utils.h"
+
+#include "camera_device.h"
+#include "thread_rpc.h"
+
+using namespace libcamera;
+
+LOG_DECLARE_CATEGORY(HAL);
+
+/*
+ * \class CameraProxy
+ *
+ * The CameraProxy wraps a CameraDevice and implements the camera3_device_t
+ * API, bridging calls received from the camera framework to the CameraDevice.
+ *
+ * Bridging operation calls between the framework and the CameraDevice is
+ * required as the two run in two different threads and certain operations,
+ * such as queueing a new capture request to the camera, shall be called in
+ * the thread that dispatches events. Other operations do not require any
+ * bridging and resolve to direct function calls on the CameraDevice instance
+ * instead.
+ */
+
+static int hal_dev_initialize(const struct camera3_device *dev,
+ const camera3_callback_ops_t *callback_ops)
+{
+ if (!dev)
+ return -EINVAL;
+
+ CameraProxy *proxy = reinterpret_cast<CameraProxy *>(dev->priv);
+ proxy->initialize(callback_ops);
+
+ return 0;
+}
+
+static int hal_dev_configure_streams(const struct camera3_device *dev,
+ camera3_stream_configuration_t *stream_list)
+{
+ if (!dev)
+ return -EINVAL;
+
+ CameraProxy *proxy = reinterpret_cast<CameraProxy *>(dev->priv);
+ return proxy->configureStreams(stream_list);
+}
+
+static const camera_metadata_t *
+hal_dev_construct_default_request_settings(const struct camera3_device *dev,
+ int type)
+{
+ if (!dev)
+ return nullptr;
+
+ CameraProxy *proxy = reinterpret_cast<CameraProxy *>(dev->priv);
+ return proxy->constructDefaultRequestSettings(type);
+}
+
+static int hal_dev_process_capture_request(const struct camera3_device *dev,
+ camera3_capture_request_t *request)
+{
+ if (!dev)
+ return -EINVAL;
+
+ CameraProxy *proxy = reinterpret_cast<CameraProxy *>(dev->priv);
+ return proxy->processCaptureRequest(request);
+}
+
+static void hal_dev_dump(const struct camera3_device *dev, int fd)
+{
+}
+
+static int hal_dev_flush(const struct camera3_device *dev)
+{
+ return 0;
+}
+
+static int hal_dev_close(hw_device_t *hw_device)
+{
+ if (!hw_device)
+ return -EINVAL;
+
+ camera3_device_t *dev = reinterpret_cast<camera3_device_t *>(hw_device);
+ CameraProxy *proxy = reinterpret_cast<CameraProxy *>(dev->priv);
+
+ proxy->close();
+
+ return 0;
+}
+
+static camera3_device_ops hal_dev_ops = {
+ .initialize = hal_dev_initialize,
+ .configure_streams = hal_dev_configure_streams,
+ .register_stream_buffers = nullptr,
+ .construct_default_request_settings = hal_dev_construct_default_request_settings,
+ .process_capture_request = hal_dev_process_capture_request,
+ .get_metadata_vendor_tag_ops = nullptr,
+ .dump = hal_dev_dump,
+ .flush = hal_dev_flush,
+ .reserved = { nullptr },
+};
+
+CameraProxy::CameraProxy(unsigned int id, std::shared_ptr<Camera> camera)
+ : id_(id)
+{
+ cameraDevice_ = new CameraDevice(id, camera);
+}
+
+CameraProxy::~CameraProxy()
+{
+ delete cameraDevice_;
+}
+
+int CameraProxy::open(const hw_module_t *hardwareModule)
+{
+ int ret = cameraDevice_->open();
+ if (ret)
+ return ret;
+
+ /* Initialize the hw_device_t in the instance camera3_module_t. */
+ camera3Device_.common.tag = HARDWARE_DEVICE_TAG;
+ camera3Device_.common.version = CAMERA_DEVICE_API_VERSION_3_3;
+ camera3Device_.common.module = (hw_module_t *)hardwareModule;
+ camera3Device_.common.close = hal_dev_close;
+
+ /*
+ * The camera device operations. These actually implement
+ * the Android Camera HALv3 interface.
+ */
+ camera3Device_.ops = &hal_dev_ops;
+ camera3Device_.priv = this;
+
+ return 0;
+}
+
+void CameraProxy::close()
+{
+ ThreadRpc rpcRequest;
+ rpcRequest.tag = ThreadRpc::Close;
+
+ threadRpcCall(rpcRequest);
+}
+
+void CameraProxy::initialize(const camera3_callback_ops_t *callbacks)
+{
+ cameraDevice_->setCallbacks(callbacks);
+}
+
+const camera_metadata_t *CameraProxy::getStaticMetadata()
+{
+ return cameraDevice_->getStaticMetadata();
+}
+
+const camera_metadata_t *CameraProxy::constructDefaultRequestSettings(int type)
+{
+ return cameraDevice_->constructDefaultRequestSettings(type);
+}
+
+int CameraProxy::configureStreams(camera3_stream_configuration_t *stream_list)
+{
+ return cameraDevice_->configureStreams(stream_list);
+}
+
+int CameraProxy::processCaptureRequest(camera3_capture_request_t *request)
+{
+ ThreadRpc rpcRequest;
+ rpcRequest.tag = ThreadRpc::ProcessCaptureRequest;
+ rpcRequest.request = request;
+
+ threadRpcCall(rpcRequest);
+
+ return 0;
+}
+
+void CameraProxy::threadRpcCall(ThreadRpc &rpcRequest)
+{
+ std::unique_ptr<ThreadRpcMessage> message =
+ utils::make_unique<ThreadRpcMessage>();
+ message->rpc = &rpcRequest;
+
+ cameraDevice_->postMessage(std::move(message));
+ rpcRequest.waitDelivery();
+}
diff --git a/src/android/camera_proxy.h b/src/android/camera_proxy.h
new file mode 100644
index 000000000000..da63bfa79fc9
--- /dev/null
+++ b/src/android/camera_proxy.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * camera_proxy.h - Proxy to camera devices
+ */
+#ifndef __ANDROID_CAMERA_PROXY_H__
+#define __ANDROID_CAMERA_PROXY_H__
+
+#include <memory>
+
+#include <hardware/camera3.h>
+
+#include <libcamera/camera.h>
+
+class CameraDevice;
+class ThreadRpc;
+
+class CameraProxy
+{
+public:
+ CameraProxy(unsigned int id, std::shared_ptr<libcamera::Camera> camera);
+ ~CameraProxy();
+
+ int open(const hw_module_t *hardwareModule);
+ void close();
+
+ void initialize(const camera3_callback_ops_t *callbacks);
+ const camera_metadata_t *getStaticMetadata();
+ const camera_metadata_t *constructDefaultRequestSettings(int type);
+ int configureStreams(camera3_stream_configuration_t *stream_list);
+ int processCaptureRequest(camera3_capture_request_t *request);
+
+ unsigned int id() const { return id_; }
+ camera3_device_t *camera3Device() { return &camera3Device_; }
+
+private:
+ void threadRpcCall(ThreadRpc &rpcRequest);
+
+ unsigned int id_;
+ CameraDevice *cameraDevice_;
+ camera3_device_t camera3Device_;
+};
+
+#endif /* __ANDROID_CAMERA_PROXY_H__ */
diff --git a/src/android/meson.build b/src/android/meson.build
index 1f242953db37..26537794bc29 100644
--- a/src/android/meson.build
+++ b/src/android/meson.build
@@ -1,3 +1,11 @@
+android_hal_sources = files([
+ 'camera3_hal.cpp',
+ 'camera_hal_manager.cpp',
+ 'camera_device.cpp',
+ 'camera_proxy.cpp',
+ 'thread_rpc.cpp'
+])
+
android_camera_metadata_sources = files([
'metadata/camera_metadata.c',
])
diff --git a/src/android/thread_rpc.cpp b/src/android/thread_rpc.cpp
new file mode 100644
index 000000000000..295a05d7c676
--- /dev/null
+++ b/src/android/thread_rpc.cpp
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * thread_rpc.cpp - Inter-thread procedure call
+ */
+
+#include "thread_rpc.h"
+
+#include "message.h"
+
+using namespace libcamera;
+
+libcamera::Message::Type ThreadRpcMessage::rpcType_ = Message::Type::None;
+
+ThreadRpcMessage::ThreadRpcMessage()
+ : Message(type())
+{
+}
+
+void ThreadRpc::notifyReception()
+{
+ {
+ libcamera::MutexLocker locker(mutex_);
+ delivered_ = true;
+ }
+ cv_.notify_one();
+}
+
+void ThreadRpc::waitDelivery()
+{
+ libcamera::MutexLocker locker(mutex_);
+ cv_.wait(locker, [&] { return delivered_; });
+}
+
+Message::Type ThreadRpcMessage::type()
+{
+ if (ThreadRpcMessage::rpcType_ == Message::Type::None)
+ rpcType_ = Message::registerMessageType();
+
+ return rpcType_;
+}
diff --git a/src/android/thread_rpc.h b/src/android/thread_rpc.h
new file mode 100644
index 000000000000..6d8992839d0b
--- /dev/null
+++ b/src/android/thread_rpc.h
@@ -0,0 +1,54 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * thread_rpc.h - Inter-thread procedure call
+ */
+#ifndef __ANDROID_THREAD_RPC_H__
+#define __ANDROID_THREAD_RPC_H__
+
+#include <condition_variable>
+#include <mutex>
+
+#include <hardware/camera3.h>
+
+#include "message.h"
+#include "thread.h"
+
+class ThreadRpc
+{
+public:
+ enum RpcTag {
+ ProcessCaptureRequest,
+ Close,
+ };
+
+ ThreadRpc()
+ : delivered_(false) {}
+
+ void notifyReception();
+ void waitDelivery();
+
+ RpcTag tag;
+
+ camera3_capture_request_t *request;
+
+private:
+ bool delivered_;
+ std::mutex mutex_;
+ std::condition_variable cv_;
+};
+
+class ThreadRpcMessage : public libcamera::Message
+{
+public:
+ ThreadRpcMessage();
+ ThreadRpc *rpc;
+
+ static Message::Type type();
+
+private:
+ static libcamera::Message::Type rpcType_;
+};
+
+#endif /* __ANDROID_THREAD_RPC_H__ */
diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
index a09b23d60022..7d5d3c04fba0 100644
--- a/src/libcamera/meson.build
+++ b/src/libcamera/meson.build
@@ -103,9 +103,18 @@ libcamera_deps = [
dependency('threads'),
]
+libcamera_link_with = []
+
+if get_option('android')
+ libcamera_sources += android_hal_sources
+ includes += android_includes
+ libcamera_link_with += android_camera_metadata
+endif
+
libcamera = shared_library('camera',
libcamera_sources,
install : true,
+ link_with : libcamera_link_with,
include_directories : includes,
dependencies : libcamera_deps)
diff --git a/src/meson.build b/src/meson.build
index 7148baee3eda..67ad20aab86b 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -1,4 +1,7 @@
-subdir('android')
+if get_option('android')
+ subdir('android')
+endif
+
subdir('libcamera')
subdir('ipa')
subdir('cam')
--
2.22.0
More information about the libcamera-devel
mailing list