【高通SDM660平台】Camera Open 流程 及 后续更新思路
-
后续更新思路
-
一、Camera Open 总结
-
二、Camera Open 代码流程分析
-
-
2.1 Java 层 Camera Class 使用介绍
-
2.2 Frameworks 层 Camera.java 分析
-
-
2.2.1 [JNI] CameraService初始化 native_setup( ) —> android_hardware_Camera_native_setup( )
-
2.2.2 [AIDL] interface ICameraService
-
2.2.3 [Native] CameraService.cpp
-
-
2.2.3.1 [HAL] 创建 Camera 客户端 makeClient( )
-
2.2.3.2 [HAL] Camera2Client初始化 client->initialize(mModule))
-
-
2.2.4 EventHandler( )
-
-
后续更新思路
《
【高通SDM660平台】(1) — Camera 驱动 Bringup Guide
》
《
【高通SDM660平台】(2) — Camera Kernel 驱动层代码逻辑分析
》
《
【高通SDM660平台】(3) — Camera V4L2 驱动层分析
》
《
【高通SDM660平台】(4) — Camera Init 初始化流程
》
《
【高通SDM660平台】(5) — Camera Open 流程
》
《
【高通SDM660平台】(6) — Camera getParameters 及 setParameters 流程
》
《
【高通SDM660平台】(7) — Camera onPreview 代码流程
》
《
【高通SDM660平台】(8) — Camera MetaData介绍
》
《
【高通SDM660平台 Android 10.0】(9) — Qcom Camera Daemon 代码分析
》
《
【高通SDM660平台 Android 10.0】(10) — Camera Sensor lib 与 Kernel Camera Probe 代码分析
》
《【高通SDM660平台】Camera Capture 流程》
《【高通SDM660平台】Camera mm-qcamera-app 代码分析》
一、Camera Open 总结
整个Camera Open 过程总结如下：
-
Java APP 层
调用 Frameworks 层 Camera.java 中的
open()
方法，
在open camera 后，才开始调用对应的
getParameters()
，
setParameters()
，
startPreview()
等 函数，这些后续分析 -
Frameworks 层 Camera.java 中的 open()
(1) 在
Camera open()
函数中，如果没有指定open 对应的camera id，则默认打开后摄
(2) 根据传入的 camera id 进行初始化
(3) 注册 EventHandler 循环监听Camera 事件
(4) 调用
native_setup()
JNI 函数，并下发 camera id 、当前包名、hal层版本号 -
JNI 层 android_hardware_Camera_native_setup
(1) 调用
Camera::connect()
函数，connect 为 AIDL 方法，通过binder 调用到服务端
CameraService.cpp
中的
CameraService::connect()
方法中
(2) 获取 Camera Class，建立专门负责与java Camera对象通信的对象
(3) 如果没有设置屏幕显示方向，则默认为0，如果不为0，调用
sendCommand
下发屏幕显示方向 -
C++ Native 层
CameraService.cpp
中
(1)
CameraService.cpp
是camera 初始化中讲过了，在开机时会注册好对应的
cameraservice
服务
(2) 前面AIDL中，调用到
CameraService.cpp
中的
CameraService::connect()
方法 在该方法中，
(3) 首先检查是否存在 client ，如果存在的话直接返回
(4) 关闭所有的 flashlight 对象
(5) 调用
makeClient()
创建 Camera Client 对象。 client是通过
Camera2ClientBase()
进行创建的，同时创建
Camera3Device
对象
(6) 调用
client->initialize
对前面创建好的 Camera client 进行初始化
(7) 初始化前先对device 进行初始化 ，在
Camera3Device->initialize()
中打开对应的 Camera 节点/dev/videox，进行初始化，获取到 Camera 的操作方法
(8) 初始化 Camera 默认参数
(9) 接着对创建 Camera 运行时的六大线程，
处理preview和录像 stream的线程、处理3A和人脸识别的线程、拍照流程状态机线程、处理拍照 jpeg stream 线程、处理零延时zsl stream使用的线程、处理callback的线程
二、Camera Open 代码流程分析
2.1 Java 层 Camera Class 使用介绍
先看下谷歌官方对 Camera Class 的介绍：
The Camera class is used to set image capture settings, start/stop preview,
snap pictures, and retrieve frames for encoding for video.
This Class is a client for the Camera service, which manages the actual camera hardware.
To access the device camera,
you must declare the {@link android.Manifest.permission#CAMERA} permission in your Android Manifest.
Also be sure to include the uses-feature manifest element to declare camera features used by your application.
For example,
if you use the camera and auto-focus feature, your Manifest should include the following:
uses-permission android:name = “android.permission.CAMERA”
uses-feature android:name = “android.hardware.camera”
uses-feature android:name = "android.hardware.camera.autofocus"
2.1.1 拍照官方流程
-
获取 Camera 对象
Obtain an instance of Camera from
{@link #open(int)}
. -
获取默认参数（例如默认分辨率、帧率等 ）
Get existing (default) settings with
{@link #getParameters()}
. -
设置并下发 Camera 参数
If necessary, modify the returned
{@link Camera.Parameters}
object and call
{@link #setParameters(Camera.Parameters)}
. -
设置屏幕显示方向
If desired, call
{@link #setDisplayOrientation(int)}
. -
传递一个完全初始化的
SurfaceHolder
，调用
setPreviewDisplay(SurfaceHolder)
，否则无法preview
Important： Pass a fully initialized
{@link SurfaceHolder}
to
{@link #setPreviewDisplay(SurfaceHolder)}
.
Without a surface, the camerawill be unable to start the preview. -
调用
startPreview()
开始预览，拍照之前必须先预览
Important: Call
{@link #startPreview()}
to start updating the preview surface.
Preview must be started before you can take a picture. -
调用
takePicture()
开始拍照时，等待它的回调函数回传数据
When you want, call
{@link #takePicture(Camera.ShutterCallback,Camera.PictureCallback, Camera.PictureCallback, Camera.PictureCallback)}
to capture a photo.
Wait for the callbacks to provide the actual image data. -
拍照完后，preview会停止。如果想继续拍照，需重新调用
startPreview()
After taking a picture, preview display will have stopped.
To take morephotos, call
{@link #startPreview()}
again first. -
调用
stopPreview()
停止更新预览界面
Call
{@link #stopPreview()}
to stop updating the preview surface. -
调用
release()
释放Camera 资源
Important: Call
{@link #release()}
to release the camera foruse by other applications.
Applications should release the cameraimmediately in
{@link android.app.Activity#onPause()}
(and
re-{@link #open()
} it in
{@link android.app.Activity#onResume()})
.
2.1.2 录像官方流程
-
获取并初始化 Camera 对像，并调用
startPreview()
Obtain and initialize a Camera and start preview as described above. -
调用
unlock()
允许 media 进程操作Camera
Cal
l {@link #unlock()}
to allow the media process to access the camera. -
调用
setCamera(Camera)
将 Camera 对像传递给
MediaRecorder
Pass the camera to
{@link android.media.MediaRecorder#setCamera(Camera)}
.
See
{@link android.media.MediaRecorder}
information about video recording. -
当录像完毕后，调用
reconnect()
重新锁定Camera
When finished recording, call
{@link #reconnect()}
to re-acquireand re-lock the camera. -
如果想拍照，重新preview ，然后拍照
If desired, restart preview and take more photos or videos. -
调用
stopPreview()
和
release()
退出预览并释放Camera资源
Call
{@link #stopPreview()}
and
{@link #release()}
as described above.
This class is not thread-safe, and is meant for use from one event thread.
Most long-running operations (preview, focus, photo capture, etc) happen asynchronously and invoke callbacks as necessary.
Callbacks will be invoked on the event thread
{@link #open(int)}
was called from.
This class’s methods must never be called from multiple threads at once.
Caution:
Different Android-powered devicesmay have different hardware specifications,
such as megapixel ratings and auto-focus capabilities.
In order for your application to be compatible with more devices,
you should not make assumptions about the device camera specifications.
2.2 Frameworks 层 Camera.java 分析
调用 Frameworks 层 Camera.java 中的 open() 方法，
在open camera 后，才开始调用对应的 getParameters()，setParameters()， startPreview() 等 函数，这些后续分析
Java 层中调用的 Camera Class 源码位于
frameworks/base/core/java/android/hardware/Camera.java
，
整个过程，主要工作如下：
(1) 在Camera open() 函数中，如果没有指定open 对应的camera id，则默认打开后摄
(2) 根据传入的 camera id 进行初始化
(3) 注册 EventHandler 循环监听Camera 事件
(4) 调用 native_setup() JNI 函数，并下发 camera id 、当前包名、hal层版本号
@ frameworks/base/core/java/android/hardware/Camera.java
public class Camera {
private static final String TAG = "Camera";
private CameraDataCallback mCameraDataCallback;
private CameraMetaDataCallback mCameraMetaDataCallback;
public static final int CAMERA_HAL_API_VERSION_1_0 = 0x100;
public static class CameraInfo {
public static final int CAMERA_FACING_BACK = 0;
public static final int CAMERA_FACING_FRONT = 1;
public static final int CAMERA_SUPPORT_MODE_ZSL = 2;
public static final int CAMERA_SUPPORT_MODE_NONZSL = 3;
public int facing;
public int orientation;
public boolean canDisableShutterSound;
};
// 1. 找开指定 id 的Camera
public static Camera open(int cameraId) {
return new Camera(cameraId);
}
// 2. 在Camera open() 函数中，如果没有指定open 对应的camera id，则默认打开后摄
public static Camera open() {
int numberOfCameras = getNumberOfCameras();
CameraInfo cameraInfo = new CameraInfo();
for (int i = 0; i < numberOfCameras; i++) {
getCameraInfo(i, cameraInfo);
if (cameraInfo.facing == CameraInfo.CAMERA_FACING_BACK) {
return new Camera(i);
}
}
return null;
}
// 3. 调用 cameraInitNormal() 初始对应 id 的Camera
/** used by Camera#open, Camera#open(int) */
Camera(int cameraId) {
int err = cameraInitNormal(cameraId);
}
private int cameraInitNormal(int cameraId) {
return cameraInitVersion(cameraId, CAMERA_HAL_API_VERSION_NORMAL_CONNECT); // -2
}
private int cameraInitVersion(int cameraId, int halVersion) {
mShutterCallback = null;
mRawImageCallback = null;
mJpegCallback = null;
mPreviewCallback = null;
mPostviewCallback = null;
mUsingPreviewAllocation = false;
mZoomListener = null;
/* ### QC ADD-ONS: START */
mCameraDataCallback = null;
mCameraMetaDataCallback = null;
/* ### QC ADD-ONS: END */
// 1. 注册 EventHandler 循环监听Camera 事件
Looper looper;
if ((looper = Looper.myLooper()) != null) {
mEventHandler = new EventHandler(this, looper);
} else if ((looper = Looper.getMainLooper()) != null) {
mEventHandler = new EventHandler(this, looper);
} else {
mEventHandler = null;
}
// 2. 获取当前包名
String packageName = ActivityThread.currentOpPackageName();
// 3. 如果定义了 prop 属性 "camera.hal1.packagelist" ， 则强制使用 HAL1
//Force HAL1 if the package name falls in this bucket
String packageList = SystemProperties.get("camera.hal1.packagelist", "");
if (packageList.length() > 0) {
TextUtils.StringSplitter splitter = new TextUtils.SimpleStringSplitter(',');
splitter.setString(packageList);
for (String str : splitter) {
if (packageName.equals(str)) {
halVersion = CAMERA_HAL_API_VERSION_1_0;
break;
}
}
}
// 4. 调用 native_setup() JNI 函数，并下发 camera id 、当前包名、hal层版本号
return native_setup(new WeakReference<Camera>(this), cameraId, halVersion, packageName);
}
2.2.1 [JNI] CameraService初始化 native_setup( ) —> android_hardware_Camera_native_setup( )
java 中通过JNI 调用 native 方法，Camera JNI 代码位于
//cameraId = 0
//halVersion = -2
native_setup(new WeakReference<Camera>(this), cameraId, halVersion, packageName);
@ frameworks/base/core/jni/android_hardware_Camera.cpp
static const JNINativeMethod camMethods[] = {
{ "_getNumberOfCameras", "()I", (void *)android_hardware_Camera_getNumberOfCameras },
{ "_getCameraInfo", "(ILandroid/hardware/Camera$CameraInfo;)V", (void*)android_hardware_Camera_getCameraInfo },
{ "native_setup", "(Ljava/lang/Object;IILjava/lang/String;)I", (void*)android_hardware_Camera_native_setup },
{ "native_release", "()V", (void*)android_hardware_Camera_release },
{ "setPreviewSurface", "(Landroid/view/Surface;)V", (void *)android_hardware_Camera_setPreviewSurface },
{ "setPreviewTexture", "(Landroid/graphics/SurfaceTexture;)V", (void *)android_hardware_Camera_setPreviewTexture },
{ "setPreviewCallbackSurface", "(Landroid/view/Surface;)V", (void *)android_hardware_Camera_setPreviewCallbackSurface },
{ "startPreview", "()V", (void *)android_hardware_Camera_startPreview },
{ "_stopPreview", "()V", (void *)android_hardware_Camera_stopPreview },
{ "previewEnabled", "()Z", (void *)android_hardware_Camera_previewEnabled },
{ "setHasPreviewCallback","(ZZ)V", (void *)android_hardware_Camera_setHasPreviewCallback },
{ "_addCallbackBuffer", "([BI)V", (void *)android_hardware_Camera_addCallbackBuffer },
{ "native_autoFocus", "()V", (void *)android_hardware_Camera_autoFocus },
{ "native_cancelAutoFocus","()V", (void *)android_hardware_Camera_cancelAutoFocus },
{ "native_takePicture", "(I)V", (void *)android_hardware_Camera_takePicture },
{ "native_setHistogramMode","(Z)V", (void *)android_hardware_Camera_setHistogramMode },
{ "native_setMetadataCb", "(Z)V", (void *)android_hardware_Camera_setMetadataCb },
{ "native_sendHistogramData","()V", (void *)android_hardware_Camera_sendHistogramData },
{ "native_setLongshot", "(Z)V", (void *)android_hardware_Camera_setLongshot },
{ "native_setParameters", "(Ljava/lang/String;)V", (void *)android_hardware_Camera_setParameters },
{ "native_getParameters", "()Ljava/lang/String;", (void *)android_hardware_Camera_getParameters },
{ "reconnect", "()V", (void*)android_hardware_Camera_reconnect },
{ "lock", "()V", (void*)android_hardware_Camera_lock },
{ "unlock", "()V", (void*)android_hardware_Camera_unlock },
{ "startSmoothZoom", "(I)V", (void *)android_hardware_Camera_startSmoothZoom },
{ "stopSmoothZoom", "()V", (void *)android_hardware_Camera_stopSmoothZoom },
{ "setDisplayOrientation","(I)V", (void *)android_hardware_Camera_setDisplayOrientation },
{ "_enableShutterSound", "(Z)Z", (void *)android_hardware_Camera_enableShutterSound },
{ "_startFaceDetection", "(I)V", (void *)android_hardware_Camera_startFaceDetection },
{ "_stopFaceDetection", "()V", (void *)android_hardware_Camera_stopFaceDetection},
{ "enableFocusMoveCallback","(I)V", (void *)android_hardware_Camera_enableFocusMoveCallback},
};
在
// connect to camera service
static jint android_hardware_Camera_native_setup(JNIEnv *env, jobject thiz, jobject weak_this, jint cameraId, jint halVersion, jstring clientPackageName)
{
// Convert jstring to String16
const char16_t *rawClientName = reinterpret_cast<const char16_t*>(env->GetStringChars(clientPackageName, NULL));
jsize rawClientNameLen = env->GetStringLength(clientPackageName);
String16 clientName(rawClientName, rawClientNameLen);
env->ReleaseStringChars(clientPackageName, reinterpret_cast<const jchar*>(rawClientName));
sp<Camera> camera;
if (halVersion == CAMERA_HAL_API_VERSION_NORMAL_CONNECT) { // -2
// Default path: hal version is don't care, do normal camera connect.
// 调用 Camera::connect() 函数，connect 为 AIDL 方法，
// 通过binder 调用到服务端CameraService.cpp中的 CameraService::connect() 方法中
camera = Camera::connect(cameraId, clientName, Camera::USE_CALLING_UID, Camera::USE_CALLING_PID);
======================>
+ // frameworks/av/camera/Camera.cpp
+ return CameraBaseT::connect(cameraId, clientPackageName, clientUid, clientPid);
+ ========>
+ // frameworks/av/camera/CameraBase.cpp
+ sp<TCam> CameraBase<TCam, TCamTraits>::connect(int cameraId, const String16& clientPackageName, int clientUid, int clientPid)
+ {
+ - sp<TCam> c = new TCam(cameraId);
+ - sp<TCamCallbacks> cl = c;
+ const sp<::android::hardware::ICameraService> cs = getCameraService();
+ TCamConnectService fnConnectService = TCamTraits::fnConnectService;
+ ret = (cs.get()->*fnConnectService)(cl, cameraId, clientPackageName, clientUid, clientPid, /*out*/ &c->mCamera);
+ --------->
+ CameraTraits<Camera>::TCamConnectService CameraTraits<Camera>::fnConnectService =
+ &::android::hardware::ICameraService::connect;
+
+ IInterface::asBinder(c->mCamera)->linkToDeath(c);
+ return c;
+ }
+ <========
<======================
} else {
jint status = Camera::connectLegacy(cameraId, halVersion, clientName, Camera::USE_CALLING_UID, camera);
if (status != NO_ERROR) {
return status;
}
}
// make sure camera hardware is alive
if (camera->getStatus() != NO_ERROR) {
return NO_INIT;
}
// 获取 Camera Class
jclass clazz = env->GetObjectClass(thiz);
if (clazz == NULL) {
// This should never happen
jniThrowRuntimeException(env, "Can't find android/hardware/Camera");
return INVALID_OPERATION;
}
// We use a weak reference so the Camera object can be garbage collected.
// The reference is only used as a proxy for callbacks.
sp<JNICameraContext> context = new JNICameraContext(env, weak_this, clazz, camera);
context->incStrong((void*)android_hardware_Camera_native_setup);
camera->setListener(context); // 专门负责与java Camera对象通信的对象
// save context in opaque field
env->SetLongField(thiz, fields.context, (jlong)context.get());
// Update default display orientation in case the sensor is reverse-landscape
CameraInfo cameraInfo;
status_t rc = Camera::getCameraInfo(cameraId, &cameraInfo);
int defaultOrientation = 0;
switch (cameraInfo.orientation) {
case 0: break;
case 90:
if (cameraInfo.facing == CAMERA_FACING_FRONT) {
defaultOrientation = 180;
}
break;
case 180:
defaultOrientation = 180;
break;
case 270:
if (cameraInfo.facing != CAMERA_FACING_FRONT) {
defaultOrientation = 180;
}
break;
default:
ALOGE("Unexpected camera orientation %d!", cameraInfo.orientation);
break;
}
// 如果没有设置屏幕显示方向，则默认为0，如果不为0，调用sendCommand 下发屏幕显示方向
if (defaultOrientation != 0) {
ALOGV("Setting default display orientation to %d", defaultOrientation);
rc = camera->sendCommand(CAMERA_CMD_SET_DISPLAY_ORIENTATION,defaultOrientation, 0);
}
return NO_ERROR;
}
2.2.2 [AIDL] interface ICameraService
在前面代码中， 经过如下一系列调用，最终走到了 AIDL 层。
native_setup()
—>
android_hardware_Camera_native_setup()
—>
CameraBaseT::connect
—>
sp<TCam> CameraBase<TCam, TCamTraits>::connect
—>
ret = (cs.get()->*fnConnectService)
—>
::android::hardware::ICameraService::connect()
fnConnectService 定义如下：
CameraTraits<Camera>::TCamConnectService CameraTraits<Camera>::fnConnectService = &::android::hardware::ICameraService::connect;
frameworks/av/camera/aidl/android/hardware/ICameraService.aidl
/**
* Binder interface for the native camera service running in mediaserver.
* @hide
*/
interface ICameraService
{
/** Open a camera device through the old camera API */
ICamera connect(ICameraClient client, int cameraId, String opPackageName, int clientUid, int clientPid);
/** Open a camera device through the new camera API Only supported for device HAL versions >= 3.2 */
ICameraDeviceUser connectDevice(ICameraDeviceCallbacks callbacks, int cameraId,String opPackageName,int clientUid);
}
AIDL 中，我们走的是老方法，
ICamera connect().
AIDL——Android Interface Definition Language,是一种接口定义语言，用于生成可以在Android设备上两个进程间进行通信的代码。
Android Java Service Framework提供的大多数系统服务都是使用AIDL语言生成的。使用AIDL语言，可以自动生成服务接口、服务代理、服务Stub代码。
2.2.3 [Native] CameraService.cpp
通过 AIDL 的 Binder 通信，跳转到 CameraService.cpp 中。
CameraService.cpp 是camera 初始化中讲过了，在开机时会注册好对应的 cameraservice 服务
还记得前面我们 《
【高通SDM660平台】Camera Init 初始化流程
》文章中，CameraService 服务已经注册好了，
此时就是通过Binder通信，调用CameraService 服务中的 connect 方法：
@frameworks/av/services/camera/libcameraservice/CameraService.cpp
Status CameraService::connect(
const sp<ICameraClient>& cameraClient,
int cameraId,
const String16& clientPackageName,
int clientUid,
int clientPid,
/*out*/
sp<ICamera>* device) {
String8 id = String8::format("%d", cameraId);
sp<Client> client = nullptr;
ret = connectHelper<ICameraClient,Client>(cameraClient, id,
CAMERA_HAL_API_VERSION_UNSPECIFIED, clientPackageName, clientUid, clientPid, API_1,
/*legacyMode*/ false, /*shimUpdateOnly*/ false,
/*out*/client);
*device = client;
return ret;
}
进入 connectHelper 函数看下：
- 检查 Client 的权限
- 如果已存在 client 则直接返回
- 在打开Camera 前，所有Flashlight 都应该被关闭
- 调用makeClient() 创建 Camera Client 对象。 client是通过 Camera2ClientBase() 进行创建的，同时创建Camera3Device 对象
- 调用client->initialize对前面创建好的 Camera client 进行初始化
template<class CALLBACK, class CLIENT>
binder::Status CameraService::connectHelper(const sp<CALLBACK>& cameraCb, const String8& cameraId,
int halVersion, const String16& clientPackageName, int clientUid, int clientPid,
apiLevel effectiveApiLevel, bool legacyMode, bool shimUpdateOnly,
/*out*/sp<CLIENT>& device) {
binder::Status ret = binder::Status::ok();
String8 clientName8(clientPackageName);
int originalClientPid = 0;
ALOGI("CameraService::connect call (PID %d \"%s\", camera ID %s) for HAL version %s and "
"Camera API version %d", clientPid, clientName8.string(), cameraId.string(),
(halVersion == -1) ? "default" : std::to_string(halVersion).c_str(), static_cast<int>(effectiveApiLevel));
sp<CLIENT> client = nullptr;
{
// 1. 检查 Client 的权限
// Enforce client permissions and do basic sanity checks
if(!(ret = validateConnectLocked(cameraId, clientName8, /*inout*/clientUid, /*inout*/clientPid, /*out*/originalClientPid)).isOk()) {
return ret;
}
sp<BasicClient> clientTmp = nullptr;
std::shared_ptr<resource_policy::ClientDescriptor<String8, sp<BasicClient>>> partial;
err = handleEvictionsLocked(cameraId, originalClientPid, effectiveApiLevel,
IInterface::asBinder(cameraCb), clientName8, /*out*/&clientTmp, /*out*/&partial));
// 2. 如果已存在 client 则直接返回
if (clientTmp.get() != nullptr) {
// Handle special case for API1 MediaRecorder where the existing client is returned
device = static_cast<CLIENT*>(clientTmp.get());
return ret;
}
// 3. 在打开Camera 前，所有Flashlight 都应该被关闭
// give flashlight a chance to close devices if necessary.
mFlashlight->prepareDeviceOpen(cameraId);
// TODO: Update getDeviceVersion + HAL interface to use strings for Camera IDs
int id = cameraIdToInt(cameraId);
int facing = -1;
int deviceVersion = getDeviceVersion(id, /*out*/&facing);
sp<BasicClient> tmp = nullptr;
// 4. 调用makeClient() 创建 Camera Client 对象。 client是通过 Camera2ClientBase() 进行创建的，同时创建Camera3Device 对象
if(!(ret = makeClient(this, cameraCb, clientPackageName, id, facing, clientPid,
clientUid, getpid(), legacyMode, halVersion, deviceVersion, effectiveApiLevel,
/*out*/&tmp)).isOk()) {
return ret;
}
client = static_cast<CLIENT*>(tmp.get()); // Camera2Client
LOG_ALWAYS_FATAL_IF(client.get() == nullptr, "%s: CameraService in invalid state",
__FUNCTION__);
// 5. 调用client->initialize对前面创建好的 Camera client 进行初始化
if ((err = client->initialize(mModule)) != OK) {
ALOGE("%s: Could not initialize client from HAL module.", __FUNCTION__);
// Errors could be from the HAL module open call or from AppOpsManager
switch(err) {
case BAD_VALUE:
return STATUS_ERROR_FMT(ERROR_ILLEGAL_ARGUMENT,
"Illegal argument to HAL module for camera \"%s\"", cameraId.string());
case -EBUSY:
return STATUS_ERROR_FMT(ERROR_CAMERA_IN_USE,
"Camera \"%s\" is already open", cameraId.string());
case -EUSERS:
return STATUS_ERROR_FMT(ERROR_MAX_CAMERAS_IN_USE,
"Too many cameras already open, cannot open camera \"%s\"",
cameraId.string());
case PERMISSION_DENIED:
return STATUS_ERROR_FMT(ERROR_PERMISSION_DENIED,
"No permission to open camera \"%s\"", cameraId.string());
case -EACCES:
return STATUS_ERROR_FMT(ERROR_DISABLED,
"Camera \"%s\" disabled by policy", cameraId.string());
case -ENODEV:
default:
return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION,
"Failed to initialize camera \"%s\": %s (%d)", cameraId.string(),
strerror(-err), err);
}
}
// Update shim paremeters for legacy clients
if (effectiveApiLevel == API_1) {
// Assume we have always received a Client subclass for API1
sp<Client> shimClient = reinterpret_cast<Client*>(client.get());
String8 rawParams = shimClient->getParameters();
CameraParameters params(rawParams);
auto cameraState = getCameraState(cameraId);
if (cameraState != nullptr) {
cameraState->setShimParams(params);
} else {
ALOGE("%s: Cannot update shim parameters for camera %s, no such device exists.",
__FUNCTION__, cameraId.string());
}
}
if (shimUpdateOnly) {
// If only updating legacy shim parameters, immediately disconnect client
mServiceLock.unlock();
client->disconnect();
mServiceLock.lock();
} else {
// Otherwise, add client to active clients list
finishConnectLocked(client, partial);
}
} // lock is destroyed, allow further connect calls
// Important: release the mutex here so the client can call back into the service from its
// destructor (can be at the end of the call)
device = client;
return ret;
}
2.2.3.1 [HAL] 创建 Camera 客户端 makeClient( )
接着调用
makeClient(this, cameraCb, clientPackageName, id, facing, clientPid, clientUid, getpid(), legacyMode, halVersion, deviceVersion, effectiveApiLevel, /*out*/&tmp))
@ frameworks/av/services/camera/libcameraservice/CameraService.cpp
Status CameraService::makeClient(const sp<CameraService>& cameraService,
const sp<IInterface>& cameraCb, const String16& packageName, int cameraId,
int facing, int clientPid, uid_t clientUid, int servicePid, bool legacyMode,
int halVersion, int deviceVersion, apiLevel effectiveApiLevel,
/*out*/sp<BasicClient>* client) {
if (halVersion < 0 || halVersion == deviceVersion) {
// Default path: HAL version is unspecified by caller, create CameraClient
// based on device version reported by the HAL.
switch(deviceVersion) {
case CAMERA_DEVICE_API_VERSION_1_0:
if (effectiveApiLevel == API_1) { // Camera1 API route
sp<ICameraClient> tmp = static_cast<ICameraClient*>(cameraCb.get());
*client = new CameraClient(cameraService, tmp, packageName, cameraId, facing,
clientPid, clientUid, getpid(), legacyMode);
} else { // Camera2 API route
ALOGW("Camera using old HAL version: %d", deviceVersion);
return STATUS_ERROR_FMT(ERROR_DEPRECATED_HAL,
"Camera device \"%d\" HAL version %d does not support camera2 API",
cameraId, deviceVersion);
}
break;
case CAMERA_DEVICE_API_VERSION_3_0:
case CAMERA_DEVICE_API_VERSION_3_1:
case CAMERA_DEVICE_API_VERSION_3_2:
case CAMERA_DEVICE_API_VERSION_3_3:
case CAMERA_DEVICE_API_VERSION_3_4:
if (effectiveApiLevel == API_1) { // Camera1 API route
sp<ICameraClient> tmp = static_cast<ICameraClient*>(cameraCb.get());
*client = new Camera2Client(cameraService, tmp, packageName, cameraId, facing,
clientPid, clientUid, servicePid, legacyMode);
} else { // Camera2 API route
sp<hardware::camera2::ICameraDeviceCallbacks> tmp =
static_cast<hardware::camera2::ICameraDeviceCallbacks*>(cameraCb.get());
*client = new CameraDeviceClient(cameraService, tmp, packageName, cameraId,
facing, clientPid, clientUid, servicePid);
}
break;
}
} else {
// A particular HAL version is requested by caller. Create CameraClient
// based on the requested HAL version.
if (deviceVersion > CAMERA_DEVICE_API_VERSION_1_0 &&
halVersion == CAMERA_DEVICE_API_VERSION_1_0) {
// Only support higher HAL version device opened as HAL1.0 device.
sp<ICameraClient> tmp = static_cast<ICameraClient*>(cameraCb.get());
*client = new CameraClient(cameraService, tmp, packageName, cameraId, facing,
clientPid, clientUid, servicePid, legacyMode);
} else {
// Other combinations (e.g. HAL3.x open as HAL2.x) are not supported yet.
ALOGE("Invalid camera HAL version %x: HAL %x device can only be"
" opened as HAL %x device", halVersion, deviceVersion,
CAMERA_DEVICE_API_VERSION_1_0);
return STATUS_ERROR_FMT(ERROR_ILLEGAL_ARGUMENT,
"Camera device \"%d\" (HAL version %d) cannot be opened as HAL version %d",
cameraId, deviceVersion, halVersion);
}
}
return Status::ok();
}
接着调用
*client = new Camera2Client(cameraService, tmp, packageName, cameraId, facing, clientPid, clientUid, servicePid, legacyMode);
client是通过 Camera2ClientBase() 进行创建的
@ frameworks/av/services/camera/libcameraservice/api1/Camera2Client.cpp
Camera2Client::Camera2Client(const sp<CameraService>& cameraService,
const sp<hardware::ICameraClient>& cameraClient,
const String16& clientPackageName,
int cameraId,
int cameraFacing,
int clientPid,
uid_t clientUid,
int servicePid,
bool legacyMode):
Camera2ClientBase(cameraService, cameraClient, clientPackageName,
cameraId, cameraFacing, clientPid, clientUid, servicePid),
mParameters(cameraId, cameraFacing)
{
ATRACE_CALL();
SharedParameters::Lock l(mParameters);
l.mParameters.state = Parameters::DISCONNECTED;
mLegacyMode = legacyMode;
}
创建Camera3Device 对象
// Interface used by CameraService
template <typename TClientBase>
Camera2ClientBase<TClientBase>::Camera2ClientBase(
const sp<CameraService>& cameraService,
const sp<TCamCallbacks>& remoteCallback,
const String16& clientPackageName,
int cameraId,
int cameraFacing,
int clientPid,
uid_t clientUid,
int servicePid):
TClientBase(cameraService, remoteCallback, clientPackageName,cameraId, cameraFacing, clientPid, clientUid, servicePid),
mSharedCameraCallbacks(remoteCallback),
mDeviceVersion(cameraService->getDeviceVersion(cameraId)),
mDeviceActive(false)
{
ALOGI("Camera %d: Opened. Client: %s (PID %d, UID %d)", cameraId, String8(clientPackageName).string(), clientPid, clientUid);
mInitialClientPid = clientPid;
mDevice = new Camera3Device(cameraId);
LOG_ALWAYS_FATAL_IF(mDevice == 0, "Device should never be NULL here.");
}
@ frameworks/av/services/camera/libcameraservice/device3/Camera3Device.cpp
Camera3Device::Camera3Device(int id):
mId(id),
mIsConstrainedHighSpeedConfiguration(false),
mHal3Device(NULL),
mStatus(STATUS_UNINITIALIZED),
mStatusWaiters(0),
mUsePartialResult(false),
mNumPartialResults(1),
mTimestampOffset(0),
mNextResultFrameNumber(0),
mNextReprocessResultFrameNumber(0),
mNextShutterFrameNumber(0),
mNextReprocessShutterFrameNumber(0),
mListener(NULL)
{
ATRACE_CALL();
camera3_callback_ops::notify = &sNotify;
camera3_callback_ops::process_capture_result = &sProcessCaptureResult;
ALOGV("%s: Created device for camera %d", __FUNCTION__, id);
}
2.2.3.2 [HAL] Camera2Client初始化 client->initialize(mModule))
- 调用 Camera3Device::initialize 对/dev/videox 调备节点进行初始化，获取对应的设备的opt 操作函数
- 初始化 Camera 默认参数
-
创建 Camera 运行时的六大线程
3.1 StreamingProcessor：用来处理preview和录像 stream的线程。
3.2 FrameProcessor：用来处理3A和人脸识别的线程。
3.3 CaptureSequencer：拍照流程状态机线程，拍照的场景非常多，后面会发出状态机的运转流程。
3.4 JpegProcessor：用来处理拍照 jpeg stream 线程
3.5 ZslProcessor3：这个处理零延时zsl stream使用的线程
3.6 mCallbackProcessor：处理callback的线程，主要包含对 callback stream 的创建函数 updateStream()以及处理 HAL 层传上来的 callback stream 的线程
@ frameworks/av/services/camera/libcameraservice/api1/Camera2Client.cpp
status_t Camera2Client::initialize(CameraModule *module)
{
ATRACE_CALL();
ALOGV("%s: Initializing client for camera %d", __FUNCTION__, mCameraId);
status_t res;
// 1. 调用 Camera3Device::initialize 进行设备初始化,获取对应的 camera device 的opt 操作函数
res = Camera2ClientBase::initialize(module);
==============>
@ frameworks/av/services/camera/libcameraservice/device3/Camera3Device.cpp
mDevice->initialize(module);
mDevice->setNotifyCallback(weakThis);
<==============
// 2. 初始化 Camera 默认参数
{
SharedParameters::Lock l(mParameters);
res = l.mParameters.initialize(&(mDevice->info()), mDeviceVersion);
================>
+ @ frameworks/av/services/camera/libcameraservice/api1/client2/Parameters.cpp
+ status_t Parameters::initialize(const CameraMetadata *info, int deviceVersion) {
+ ......
+ videoWidth = previewWidth;
+ videoHeight = previewHeight;
+ params.setPreviewSize(previewWidth, previewHeight);
+ params.setVideoSize(videoWidth, videoHeight);
+ params.set(CameraParameters::KEY_PREFERRED_PREVIEW_SIZE_FOR_VIDEO,
+ String8::format("%dx%d", previewWidth, previewHeight));
+ params.set(CameraParameters::KEY_SUPPORTED_PREVIEW_FORMATS, supportedPreviewFormats);
+ ...... 省略一系列 参数初始化代码
<================
}
String8 threadName;
// 3. 创建 Camera 运行时的六大线程
// 3.1 StreamingProcessor：用来处理preview和录像 stream的线程。
mStreamingProcessor = new StreamingProcessor(this);
threadName = String8::format("C2-%d-StreamProc", mCameraId);
mFrameProcessor->run(threadName.string());
// 3.2 FrameProcessor：用来处理3A和人脸识别的线程。
mFrameProcessor = new FrameProcessor(mDevice, this);
threadName = String8::format("C2-%d-FrameProc",mCameraId);
mFrameProcessor->run(threadName.string());
// 3.3 CaptureSequencer：拍照流程状态机线程，拍照的场景非常多，后面会发出状态机的运转流程。
mCaptureSequencer = new CaptureSequencer(this);
threadName = String8::format("C2-%d-CaptureSeq",mCameraId);
mCaptureSequencer->run(threadName.string());
// 3.4 JpegProcessor：用来处理拍照 jpeg stream 线程
mJpegProcessor = new JpegProcessor(this, mCaptureSequencer);
threadName = String8::format("C2-%d-JpegProc",mCameraId);
mJpegProcessor->run(threadName.string());
// 3.5 ZslProcessor3：这个处理零延时zsl stream使用的线程
mZslProcessor = new ZslProcessor(this, mCaptureSequencer);
threadName = String8::format("C2-%d-ZslProc",mCameraId);
mZslProcessor->run(threadName.string());
// 3.6 mCallbackProcessor：处理callback的线程，主要包含对 callback stream 的创建函数 updateStream()以及处理 HAL 层传上来的 callback stream 的线程
mCallbackProcessor = new CallbackProcessor(this);
threadName = String8::format("C2-%d-CallbkProc",mCameraId);
mCallbackProcessor->run(threadName.string());
return OK;
}
2.2.3.2.1 [HAL] Camera device 初始化 mDevice->initialize(module)
- 调用 hardware 层的camera_module_t.common 中的 open 方法，传入Camera ID
- 获取 Camera相关的信息
- 初始化 Camera 设备
@ frameworks/av/services/camera/libcameraservice/device3/Camera3Device.cpp
status_t Camera3Device::initialize(CameraModule *module)
{
ALOGV("%s: Initializing device for camera %d", __FUNCTION__, mId);
/** Open HAL device */
String8 deviceName = String8::format("%d", mId);
camera3_device_t *device;
ATRACE_BEGIN("camera3->open");
// 1. 调用 hardware 层的camera_module_t.common 中的 open 方法，传入Camera ID
res = module->open(deviceName.string(), reinterpret_cast<hw_device_t**>(&device));
===============> @ frameworks/av/services/camera/libcameraservice/common/CameraModule.cpp
+ res = filterOpenErrorCode(mModule->common.methods->open(&mModule->common, id, device));
+ =========>
+ @ hardware/qcom/camera/QCamera2/QCamera2Hal.cpp
+ struct hw_module_methods_t QCamera2Factory::mModuleMethods = {
+ .open = QCamera2Factory::camera_device_open,
+ =====>
+ @ hardware/qcom/camera/QCamera2/QCamera2Factory.cpp
+ rc = gQCamera2Factory->cameraDeviceOpen(atoi(id), hw_device);
+ };
+ <=========
+<===============
// 2. 获取 Camera相关的信息
camera_info info;
res = module->getCameraInfo(mId, &info);
// 3. 初始化 Camera 设备，设置回调函数
/** Initialize device with callback functions */
ATRACE_BEGIN("camera3->initialize");
res = device->ops->initialize(device, this);
ATRACE_END();
================>
+ @ hardware/qcom/camera/QCamera2/HAL3/QCamera3HWI.cpp
+ camera3_device_ops_t QCamera3HardwareInterface::mCameraOps = {
+ .initialize = QCamera3HardwareInterface::initialize,
+ ============>
+ int rc = hw->initialize(callback_ops);
<================
/** Start up status tracker thread */
mStatusTracker = new StatusTracker(this);
res = mStatusTracker->run(String8::format("C3Dev-%d-Status", mId).string());
if (res != OK) {
SET_ERR_L("Unable to start status tracking thread: %s (%d)",
strerror(-res), res);
device->common.close(&device->common);
mStatusTracker.clear();
return res;
}
/** Register in-flight map to the status tracker */
mInFlightStatusId = mStatusTracker->addComponent();
/** Create buffer manager */
mBufferManager = new Camera3BufferManager();
bool aeLockAvailable = false;
camera_metadata_ro_entry aeLockAvailableEntry;
res = find_camera_metadata_ro_entry(info.static_camera_characteristics,
ANDROID_CONTROL_AE_LOCK_AVAILABLE, &aeLockAvailableEntry);
if (res == OK && aeLockAvailableEntry.count > 0) {
aeLockAvailable = (aeLockAvailableEntry.data.u8[0] ==
ANDROID_CONTROL_AE_LOCK_AVAILABLE_TRUE);
}
/** Start up request queue thread */
mRequestThread = new RequestThread(this, mStatusTracker, device, aeLockAvailable);
res = mRequestThread->run(String8::format("C3Dev-%d-ReqQueue", mId).string());
if (res != OK) {
SET_ERR_L("Unable to start request queue thread: %s (%d)",
strerror(-res), res);
device->common.close(&device->common);
mRequestThread.clear();
return res;
}
mPreparerThread = new PreparerThread();
/** Everything is good to go */
mDeviceVersion = device->common.version;
mDeviceInfo = info.static_camera_characteristics;
mHal3Device = device;
// Determine whether we need to derive sensitivity boost values for older devices.
// If post-RAW sensitivity boost range is listed, so should post-raw sensitivity control
// be listed (as the default value 100)
if (mDeviceVersion < CAMERA_DEVICE_API_VERSION_3_4 &&
mDeviceInfo.exists(ANDROID_CONTROL_POST_RAW_SENSITIVITY_BOOST_RANGE)) {
mDerivePostRawSensKey = true;
}
internalUpdateStatusLocked(STATUS_UNCONFIGURED);
mNextStreamId = 0;
mDummyStreamId = NO_STREAM;
mNeedConfig = true;
mPauseStateNotify = false;
// Measure the clock domain offset between camera and video/hw_composer
camera_metadata_entry timestampSource =
mDeviceInfo.find(ANDROID_SENSOR_INFO_TIMESTAMP_SOURCE);
if (timestampSource.count > 0 && timestampSource.data.u8[0] ==
ANDROID_SENSOR_INFO_TIMESTAMP_SOURCE_REALTIME) {
mTimestampOffset = getMonoToBoottimeOffset();
}
// Will the HAL be sending in early partial result metadata?
if (mDeviceVersion >= CAMERA_DEVICE_API_VERSION_3_2) {
camera_metadata_entry partialResultsCount =
mDeviceInfo.find(ANDROID_REQUEST_PARTIAL_RESULT_COUNT);
if (partialResultsCount.count > 0) {
mNumPartialResults = partialResultsCount.data.i32[0];
mUsePartialResult = (mNumPartialResults > 1);
}
} else {
camera_metadata_entry partialResultsQuirk =
mDeviceInfo.find(ANDROID_QUIRKS_USE_PARTIAL_RESULT);
if (partialResultsQuirk.count > 0 && partialResultsQuirk.data.u8[0] == 1) {
mUsePartialResult = true;
}
}
camera_metadata_entry configs =
mDeviceInfo.find(ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS);
for (uint32_t i = 0; i < configs.count; i += 4) {
if (configs.data.i32[i] == HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED &&
configs.data.i32[i + 3] ==
ANDROID_SCALER_AVAILABLE_STREAM_CONFIGURATIONS_INPUT) {
mSupportedOpaqueInputSizes.add(Size(configs.data.i32[i + 1],
configs.data.i32[i + 2]));
}
}
return OK;
}
2.2.3.2.2 [Hardware] 打开设备 gQCamera2Factory->cameraDeviceOpen( )
@ hardware/qcom/camera/QCamera2/QCamera2Factory.cpp
int QCamera2Factory::cameraDeviceOpen(int camera_id, struct hw_device_t **hw_device)
{
LOGI("Open camera id %d API version %d",camera_id, mHalDescriptors[camera_id].device_version);
if ( mHalDescriptors[camera_id].device_version == CAMERA_DEVICE_API_VERSION_3_0 ) {
CAMSCOPE_INIT(CAMSCOPE_SECTION_HAL);
QCamera3HardwareInterface *hw = new QCamera3HardwareInterface(mHalDescriptors[camera_id].cameraId, mCallbacks);
rc = hw->openCamera(hw_device);
}
#ifdef QCAMERA_HAL1_SUPPORT
else if (mHalDescriptors[camera_id].device_version == CAMERA_DEVICE_API_VERSION_1_0) {
QCamera2HardwareInterface *hw = new QCamera2HardwareInterface((uint32_t)camera_id);
rc = hw->openCamera(hw_device);
}
#endif
return rc;
}
初始化
QCamera3HardwareInterface()
@ hardware/qcom/camera/QCamera2/HAL3/QCamera3HWI.cpp
QCamera3HardwareInterface::QCamera3HardwareInterface(uint32_t cameraId, const camera_module_callbacks_t *callbacks)
: mCameraId(cameraId),
mCameraHandle(NULL),
mCameraInitialized(false),
mCallbacks(callbacks),
...... //省略一系列Camera 初始化默认值
{
// 1. 获取HAL 层 log 等级
getLogLevel();
=========>
property_get("persist.camera.hal.debug", prop, "0");
property_get("persist.camera.kpi.debug", prop, "0");
property_get("persist.camera.global.debug", prop, "0");
mCommon.init(gCamCapability[cameraId]);
mCameraDevice.common.tag = HARDWARE_DEVICE_TAG;
mCameraDevice.common.version = CAMERA_DEVICE_API_VERSION_3_4;
mCameraDevice.common.close = close_camera_device;
mCameraDevice.ops = &mCameraOps;
===⇒ @ hardware/qcom/camera/QCamera2/HAL3/QCamera3HWI.cpp
mCameraDevice.priv = this;
gCamCapability[cameraId]->version = CAM_HAL_V3;
// TODO: hardcode for now until mctl add support for min_num_pp_bufs
//TBD - To see if this hardcoding is needed. Check by printing if this is filled by mctl to 3
gCamCapability[cameraId]->min_num_pp_bufs = 3;
pthread_condattr_t mCondAttr;
pthread_condattr_init(&mCondAttr);
pthread_condattr_setclock(&mCondAttr, CLOCK_MONOTONIC);
pthread_cond_init(&mBuffersCond, &mCondAttr);
pthread_cond_init(&mRequestCond, &mCondAttr);
pthread_cond_init(&mHdrRequestCond, &mCondAttr);
pthread_condattr_destroy(&mCondAttr);
mPendingLiveRequest = 0;
mCurrentRequestId = -1;
pthread_mutex_init(&mMutex, NULL);
for (size_t i = 0; i < CAMERA3_TEMPLATE_COUNT; i++)
mDefaultMetadata[i] = NULL;
// Getting system props of different kinds
char prop[PROPERTY_VALUE_MAX];
memset(prop, 0, sizeof(prop));
// 获取 persist.camera.raw.dump，是否使能 RAW dump 功能
property_get("persist.camera.raw.dump", prop, "0");
mEnableRawDump = atoi(prop);
// 获取 persist.camera.hal3.force.hdr，是否使能 hdr 功能
property_get("persist.camera.hal3.force.hdr", prop, "0");
mForceHdrSnapshot = atoi(prop);
if (mEnableRawDump)
LOGD("Raw dump from Camera HAL enabled");
memset(&mInputStreamInfo, 0, sizeof(mInputStreamInfo));
memset(mLdafCalib, 0, sizeof(mLdafCalib));
memset(prop, 0, sizeof(prop));
property_get("persist.camera.tnr.preview", prop, "0");
m_bTnrPreview = (uint8_t)atoi(prop);
memset(prop, 0, sizeof(prop));
property_get("persist.camera.swtnr.preview", prop, "1");
m_bSwTnrPreview = (uint8_t)atoi(prop);
memset(prop, 0, sizeof(prop));
property_get("persist.camera.tnr.video", prop, "0");
m_bTnrVideo = (uint8_t)atoi(prop);
memset(prop, 0, sizeof(prop));
property_get("persist.camera.avtimer.debug", prop, "0");
m_debug_avtimer = (uint8_t)atoi(prop);
LOGI("AV timer enabled: %d", m_debug_avtimer);
memset(prop, 0, sizeof(prop));
property_get("persist.camera.cacmode.disable", prop, "0");
m_cacModeDisabled = (uint8_t)atoi(prop);
mRdiModeFmt = gCamCapability[mCameraId]->rdi_mode_stream_fmt;
//Load and read GPU library.
lib_surface_utils = NULL;
LINK_get_surface_pixel_alignment = NULL;
mSurfaceStridePadding = CAM_PAD_TO_32;
// 打开 libadreno_utils.so
lib_surface_utils = dlopen("libadreno_utils.so", RTLD_NOW);
if (lib_surface_utils) {
*(void **)&LINK_get_surface_pixel_alignment =
dlsym(lib_surface_utils, "get_gpu_pixel_alignment");
if (LINK_get_surface_pixel_alignment) {
mSurfaceStridePadding = LINK_get_surface_pixel_alignment();
}
dlclose(lib_surface_utils);
}
if (gCamCapability[cameraId]->is_quadracfa_sensor) {
LOGI("Sensor support Quadra CFA mode");
m_bQuadraCfaSensor = true;
}
m_bQuadraCfaRequest = false;
m_bQuadraSizeConfigured = false;
memset(&mStreamList, 0, sizeof(camera3_stream_configuration_t));
}
接下来，调用
hw->openCamera(hw_device);
@ hardware/qcom/camera/QCamera2/HAL3/QCamera3HWI.cpp
int QCamera3HardwareInterface::openCamera(struct hw_device_t **hw_device)
{
if (mState != CLOSED) {
*hw_device = NULL;
return PERMISSION_DENIED;
}
mPerfLockMgr.acquirePerfLock(PERF_LOCK_OPEN_CAMERA);
LOGI("[KPI Perf]: E PROFILE_OPEN_CAMERA camera id %d",mCameraId);
rc = openCamera();
if (rc == 0) {
*hw_device = &mCameraDevice.common;
} else {
*hw_device = NULL;
}
LOGI("[KPI Perf]: X PROFILE_OPEN_CAMERA camera id %d, rc: %d", mCameraId, rc);
if (rc == NO_ERROR) {
mState = OPENED;
}
return rc;
}
接下来调用
int QCamera3HardwareInterface::openCamera()
@ hardware/qcom/camera/QCamera2/HAL3/QCamera3HWI.cpp
int QCamera3HardwareInterface::openCamera()
{
KPI_ATRACE_CAMSCOPE_CALL(CAMSCOPE_HAL3_OPENCAMERA);
if (mCameraHandle) {
LOGE("Failure: Camera already opened");
return ALREADY_EXISTS;
}
rc = QCameraFlash::getInstance().reserveFlashForCamera(mCameraId);
if (rc < 0) {
LOGE("Failed to reserve flash for camera id: %d",
mCameraId);
return UNKNOWN_ERROR;
}
rc = camera_open((uint8_t)mCameraId, &mCameraHandle);
rc = mCameraHandle->ops->register_event_notify(mCameraHandle->camera_handle, camEvtHandle, (void *)this);
mExifParams.debug_params = (mm_jpeg_debug_exif_params_t *) malloc (sizeof(mm_jpeg_debug_exif_params_t));
if (mExifParams.debug_params) {
memset(mExifParams.debug_params, 0, sizeof(mm_jpeg_debug_exif_params_t));
} else {
LOGE("Out of Memory. Allocation failed for 3A debug exif params");
return NO_MEMORY;
}
mFirstConfiguration = true;
//Notify display HAL that a camera session is active.
//But avoid calling the same during bootup because camera service might open/close
//cameras at boot time during its initialization and display service will also internally
//wait for camera service to initialize first while calling this display API, resulting in a
//deadlock situation. Since boot time camera open/close calls are made only to fetch
//capabilities, no need of this display bw optimization.
//Use "service.bootanim.exit" property to know boot status.
property_get("service.bootanim.exit", value, "0");
if (atoi(value) == 1) {
pthread_mutex_lock(&gCamLock);
if (gNumCameraSessions++ == 0) {
setCameraLaunchStatus(true);
}
pthread_mutex_unlock(&gCamLock);
}
//fill the session id needed while linking dual cam
pthread_mutex_lock(&gCamLock);
rc = mCameraHandle->ops->get_session_id(mCameraHandle->camera_handle,
&sessionId[mCameraId]);
pthread_mutex_unlock(&gCamLock);
if (rc < 0) {
LOGE("Error, failed to get sessiion id");
return UNKNOWN_ERROR;
} else {
//Allocate related cam sync buffer
//this is needed for the payload that goes along with bundling cmd for related
//camera use cases
m_pDualCamCmdHeap = new QCamera3HeapMemory(1);
rc = m_pDualCamCmdHeap->allocate(sizeof(cam_dual_camera_cmd_info_t));
if(rc != OK) {
rc = NO_MEMORY;
LOGE("Dualcam: Failed to allocate Related cam sync Heap memory");
return NO_MEMORY;
}
//Map memory for related cam sync buffer
rc = mCameraHandle->ops->map_buf(mCameraHandle->camera_handle,
CAM_MAPPING_BUF_TYPE_DUAL_CAM_CMD_BUF,
m_pDualCamCmdHeap->getFd(0),
sizeof(cam_dual_camera_cmd_info_t),
m_pDualCamCmdHeap->getPtr(0));
if(rc < 0) {
LOGE("Dualcam: failed to map Related cam sync buffer");
rc = FAILED_TRANSACTION;
return NO_MEMORY;
}
m_pDualCamCmdPtr = (cam_dual_camera_cmd_info_t*) DATA_PTR(m_pDualCamCmdHeap,0);
}
LOGH("mCameraId=%d",mCameraId);
return NO_ERROR;
}
(1) camera_open((uint8_t)mCameraId, &mCameraHandle)
打开Camera 成功后，hardware 层中将Camera 所有信息保存在
g_cam_ctrl.cam_obj[cam_idx]
中，同时返回对应的camera 的opt 操作函数
@ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_interface.c
int32_t camera_open(uint8_t camera_idx, mm_camera_vtbl_t **camera_vtbl)
{
int32_t rc = 0;
mm_camera_obj_t *cam_obj = NULL;
uint32_t cam_idx = camera_idx;
uint32_t aux_idx = 0;
uint8_t is_multi_camera = 0;
#ifdef QCAMERA_REDEFINE_LOG
mm_camera_debug_open();
#endif
LOGD("E camera_idx = %d\n", camera_idx);
if (is_dual_camera_by_idx(camera_idx)) {
is_multi_camera = 1;
cam_idx = mm_camera_util_get_handle_by_num(0,g_cam_ctrl.cam_index[camera_idx]);
aux_idx = (get_aux_camera_handle(g_cam_ctrl.cam_index[camera_idx]) >> MM_CAMERA_HANDLE_SHIFT_MASK);
LOGH("Dual Camera: Main ID = %d Aux ID = %d", cam_idx, aux_idx);
}
pthread_mutex_lock(&g_intf_lock);
/* opened already */
if(NULL != g_cam_ctrl.cam_obj[cam_idx] && g_cam_ctrl.cam_obj[cam_idx]->ref_count != 0) {
pthread_mutex_unlock(&g_intf_lock);
LOGE("Camera %d is already open", cam_idx);
return -EBUSY;
}
cam_obj = (mm_camera_obj_t *)malloc(sizeof(mm_camera_obj_t));
/* initialize camera obj */
memset(cam_obj, 0, sizeof(mm_camera_obj_t));
cam_obj->ctrl_fd = -1;
cam_obj->ds_fd = -1;
cam_obj->ref_count++;
cam_obj->my_num = 0;
cam_obj->my_hdl = mm_camera_util_generate_handler(cam_idx);
cam_obj->vtbl.camera_handle = cam_obj->my_hdl; /* set handler */
cam_obj->vtbl.ops = &mm_camera_ops;
pthread_mutex_init(&cam_obj->cam_lock, NULL);
pthread_mutex_init(&cam_obj->muxer_lock, NULL);
/* unlock global interface lock, if not, in dual camera use case,
* current open will block operation of another opened camera obj*/
pthread_mutex_lock(&cam_obj->cam_lock);
pthread_mutex_unlock(&g_intf_lock);
rc = mm_camera_open(cam_obj);
if (is_multi_camera) {
/*Open Aux camer's*/
pthread_mutex_lock(&g_intf_lock);
if(NULL != g_cam_ctrl.cam_obj[aux_idx] &&
g_cam_ctrl.cam_obj[aux_idx]->ref_count != 0) {
pthread_mutex_unlock(&g_intf_lock);
LOGE("Camera %d is already open", aux_idx);
rc = -EBUSY;
} else {
pthread_mutex_lock(&cam_obj->muxer_lock);
pthread_mutex_unlock(&g_intf_lock);
rc = mm_camera_muxer_camera_open(aux_idx, cam_obj);
}
}
LOGH("Open succeded: handle = %d", cam_obj->vtbl.camera_handle);
g_cam_ctrl.cam_obj[cam_idx] = cam_obj;
*camera_vtbl = &cam_obj->vtbl;
return 0;
}
继续跟进分析：
此时Open 对应的 /dev/video 节点，获得对应的session_id，创建好相关的 socket ，最终所有信息，保存在
mm_camera_obj_t * cam_obj
节构体中。
@ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera.c
int32_t mm_camera_open(mm_camera_obj_t *my_obj)
{
char dev_name[MM_CAMERA_DEV_NAME_LEN];
int8_t n_try=MM_CAMERA_DEV_OPEN_TRIES;
uint8_t sleep_msec=MM_CAMERA_DEV_OPEN_RETRY_SLEEP;
int cam_idx = 0;
const char *dev_name_value = NULL;
LOGD("begin\n");
dev_name_value = mm_camera_util_get_dev_name_by_num(my_obj->my_num, my_obj->my_hdl);
snprintf(dev_name, sizeof(dev_name), "/dev/%s",dev_name_value);
sscanf(dev_name, "/dev/video%d", &cam_idx);
LOGD("dev name = %s, cam_idx = %d", dev_name, cam_idx);
do{
n_try--;
errno = 0;
my_obj->ctrl_fd = open(dev_name, O_RDWR | O_NONBLOCK);
l_errno = errno;
LOGD("ctrl_fd = %d, errno == %d", my_obj->ctrl_fd, l_errno);
if((my_obj->ctrl_fd >= 0) || (errno != EIO && errno != ETIMEDOUT) || (n_try <= 0 )) {
break;
}
LOGE("Failed with %s error, retrying after %d milli-seconds", strerror(errno), sleep_msec);
usleep(sleep_msec * 1000U);
}while (n_try > 0);
mm_camera_get_session_id(my_obj, &my_obj->sessionid);
LOGH("Camera Opened id = %d sessionid = %d", cam_idx, my_obj->sessionid);
#ifdef DAEMON_PRESENT
/* open domain socket*/
n_try = MM_CAMERA_DEV_OPEN_TRIES;
do {
n_try--;
my_obj->ds_fd = mm_camera_socket_create(cam_idx, MM_CAMERA_SOCK_TYPE_UDP);
l_errno = errno;
LOGD("ds_fd = %d, errno = %d", my_obj->ds_fd, l_errno);
if((my_obj->ds_fd >= 0) || (n_try <= 0 )) {
LOGD("opened, break out while loop");
break;
}
LOGD("failed with I/O error retrying after %d milli-seconds", sleep_msec);
usleep(sleep_msec * 1000U);
} while (n_try > 0);
#else /* DAEMON_PRESENT */
cam_status_t cam_status;
cam_status = mm_camera_module_open_session(my_obj->sessionid,mm_camera_module_event_handler);
#endif /* DAEMON_PRESENT */
pthread_condattr_init(&cond_attr);
pthread_condattr_setclock(&cond_attr, CLOCK_MONOTONIC);
pthread_mutex_init(&my_obj->msg_lock, NULL);
pthread_mutex_init(&my_obj->cb_lock, NULL);
pthread_mutex_init(&my_obj->evt_lock, NULL);
pthread_cond_init(&my_obj->evt_cond, &cond_attr);
pthread_condattr_destroy(&cond_attr);
LOGD("Launch evt Thread in Cam Open");
snprintf(my_obj->evt_thread.threadName, THREAD_NAME_SIZE, "CAM_Dispatch");
mm_camera_cmd_thread_launch(&my_obj->evt_thread, mm_camera_dispatch_app_event, (void *)my_obj);
/* launch event poll thread
* we will add evt fd into event poll thread upon user first register for evt */
LOGD("Launch evt Poll Thread in Cam Open");
snprintf(my_obj->evt_poll_thread.threadName, THREAD_NAME_SIZE, "CAM_evntPoll");
mm_camera_poll_thread_launch(&my_obj->evt_poll_thread, MM_CAMERA_POLL_TYPE_EVT);
mm_camera_evt_sub(my_obj, TRUE);
/* unlock cam_lock, we need release global intf_lock in camera_open(),
* in order not block operation of other Camera in dual camera use case.*/
pthread_mutex_unlock(&my_obj->cam_lock);
LOGD("end (rc = %d)\n", rc);
return rc;
}
(2) Camera 操作节构体 cam_obj->vtbl.ops
@ hardware/qcom/camera/QCamera2/stack/mm-camera-interface/src/mm_camera_interface.c
static mm_camera_ops_t mm_camera_ops = {
.query_capability = mm_camera_intf_query_capability,
.register_event_notify = mm_camera_intf_register_event_notify,
.close_camera = mm_camera_intf_close,
.set_parms = mm_camera_intf_set_parms,
.get_parms = mm_camera_intf_get_parms,
.do_auto_focus = mm_camera_intf_do_auto_focus,
.cancel_auto_focus = mm_camera_intf_cancel_auto_focus,
.prepare_snapshot = mm_camera_intf_prepare_snapshot,
.start_zsl_snapshot = mm_camera_intf_start_zsl_snapshot,
.stop_zsl_snapshot = mm_camera_intf_stop_zsl_snapshot,
.map_buf = mm_camera_intf_map_buf,
.map_bufs = mm_camera_intf_map_bufs,
.unmap_buf = mm_camera_intf_unmap_buf,
.add_channel = mm_camera_intf_add_channel,
.delete_channel = mm_camera_intf_del_channel,
.get_bundle_info = mm_camera_intf_get_bundle_info,
.add_stream = mm_camera_intf_add_stream,
.link_stream = mm_camera_intf_link_stream,
.delete_stream = mm_camera_intf_del_stream,
.config_stream = mm_camera_intf_config_stream,
.qbuf = mm_camera_intf_qbuf,
.cancel_buffer = mm_camera_intf_cancel_buf,
.get_queued_buf_count = mm_camera_intf_get_queued_buf_count,
.map_stream_buf = mm_camera_intf_map_stream_buf,
.map_stream_bufs = mm_camera_intf_map_stream_bufs,
.unmap_stream_buf = mm_camera_intf_unmap_stream_buf,
.set_stream_parms = mm_camera_intf_set_stream_parms,
.get_stream_parms = mm_camera_intf_get_stream_parms,
.start_channel = mm_camera_intf_start_channel,
.stop_channel = mm_camera_intf_stop_channel,
.request_super_buf = mm_camera_intf_request_super_buf,
.cancel_super_buf_request = mm_camera_intf_cancel_super_buf_request,
.flush_super_buf_queue = mm_camera_intf_flush_super_buf_queue,
.configure_notify_mode = mm_camera_intf_configure_notify_mode,
.process_advanced_capture = mm_camera_intf_process_advanced_capture,
.get_session_id = mm_camera_intf_get_session_id,
.set_dual_cam_cmd = mm_camera_intf_set_dual_cam_cmd,
.flush = mm_camera_intf_flush,
.register_stream_buf_cb = mm_camera_intf_register_stream_buf_cb,
.register_frame_sync = mm_camera_intf_reg_frame_sync,
.handle_frame_sync_cb = mm_camera_intf_handle_frame_sync_cb
};
2.2.2.3.3 [Hardware] 初始化Framewroks层的Callback 函数 QCamera3HardwareInterface::initialize( )
@ hardware/qcom/camera/QCamera2/HAL3/QCamera3HWI.cpp
/*===========================================================================
* FUNCTION : initialize
* DESCRIPTION: Initialize frameworks callback functions
* @callback_ops : callback function to frameworks
*==========================================================================*/
int QCamera3HardwareInterface::initialize(const struct camera3_callback_ops *callback_ops)
{
ATRACE_CAMSCOPE_CALL(CAMSCOPE_HAL3_INIT);
LOGI("E :mCameraId = %d mState = %d", mCameraId, mState);
rc = initParameters();
mCallbackOps = callback_ops;
=====> 该Callback 是从 frameworks/av/services/camera/libcameraservice/CameraService.cpp 中传递下来的
if (mModule->getModuleApiVersion() >= CAMERA_MODULE_API_VERSION_2_1) {
mModule->setCallbacks(this);
}
mChannelHandle = mCameraHandle->ops->add_channel( mCameraHandle->camera_handle, NULL, NULL, this);
mCameraInitialized = true;
mState = INITIALIZED;
LOGI("X");
return 0;
}
2.2.4 EventHandler( )
在 EventHandler 中，根据具体的事件，调用不同的 callback 函数
@ frameworks/base/core/java/android/hardware/Camera.java
private class EventHandler extends Handler
{
private final Camera mCamera;
public EventHandler(Camera c, Looper looper) {
super(looper);
mCamera = c;
}
@Override
public void handleMessage(Message msg) {
switch(msg.what) {
case CAMERA_MSG_SHUTTER:
if (mShutterCallback != null) {
mShutterCallback.onShutter();
}
return;
case CAMERA_MSG_RAW_IMAGE:
if (mRawImageCallback != null) {
mRawImageCallback.onPictureTaken((byte[])msg.obj, mCamera);
}
return;
case CAMERA_MSG_COMPRESSED_IMAGE:
if (mJpegCallback != null) {
mJpegCallback.onPictureTaken((byte[])msg.obj, mCamera);
}
return;
case CAMERA_MSG_PREVIEW_FRAME:
PreviewCallback pCb = mPreviewCallback;
if (pCb != null) {
if (mOneShot) {
// Clear the callback variable before the callback
// in case the app calls setPreviewCallback from
// the callback function
mPreviewCallback = null;
} else if (!mWithBuffer) {
// We're faking the camera preview mode to prevent
// the app from being flooded with preview frames.
// Set to oneshot mode again.
setHasPreviewCallback(true, false);
}
pCb.onPreviewFrame((byte[])msg.obj, mCamera);
}
return;
case CAMERA_MSG_POSTVIEW_FRAME:
if (mPostviewCallback != null) {
mPostviewCallback.onPictureTaken((byte[])msg.obj, mCamera);
}
return;
case CAMERA_MSG_FOCUS:
AutoFocusCallback cb = null;
synchronized (mAutoFocusCallbackLock) {
cb = mAutoFocusCallback;
}
if (cb != null) {
boolean success = msg.arg1 == 0 ? false : true;
cb.onAutoFocus(success, mCamera);
}
return;
case CAMERA_MSG_ZOOM:
if (mZoomListener != null) {
mZoomListener.onZoomChange(msg.arg1, msg.arg2 != 0, mCamera);
}
return;
case CAMERA_MSG_PREVIEW_METADATA:
if (mFaceListener != null) {
mFaceListener.onFaceDetection((Face[])msg.obj, mCamera);
}
return;
case CAMERA_MSG_ERROR :
Log.e(TAG, "Error " + msg.arg1);
if (mErrorCallback != null) {
mErrorCallback.onError(msg.arg1, mCamera);
}
return;
case CAMERA_MSG_FOCUS_MOVE:
if (mAutoFocusMoveCallback != null) {
mAutoFocusMoveCallback.onAutoFocusMoving(msg.arg1 == 0 ? false : true, mCamera);
}
return;
/* ### QC ADD-ONS: START */
case CAMERA_MSG_STATS_DATA:
int statsdata[] = new int[257];
for(int i =0; i<257; i++ ) {
statsdata[i] = byteToInt( (byte[])msg.obj, i*4);
}
if (mCameraDataCallback != null) {
mCameraDataCallback.onCameraData(statsdata, mCamera);
}
return;
case CAMERA_MSG_META_DATA:
if (mCameraMetaDataCallback != null) {
mCameraMetaDataCallback.onCameraMetaData((byte[])msg.obj, mCamera);
}
return;
/* ### QC ADD-ONS: END */
default:
Log.e(TAG, "Unknown message type " + msg.what);
return;
}
}
}
至此，整个open Camera 流程就完了
接下来待分析，《【高通SDM660平台】Camera Preview 流程》
参考：
《
camera
》
《
android_camera系统
》
《
Android6.0 camera初始化及预览流程
》
《
Android camera fw学习(二)-open camera操作过程&准备工作分析
》
版权声明：本文为Ciellee原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。