android camera recording［转］

转自：http://leave001.blog.163.com/blog/static/16269129320101016104644615/

Recording：

VideoCamera::startVideoRecording(), VideoCamera.java

MediaRecorder::start(), MediaRecorder.java

android_media_MediaRecorder_start(), android_media_MediaRecorder.cpp

MediaRecorder::start(), mediarecorder.cpp

MediaRecorderClient::start(), MediaRecorderClient.cpp

PVMediaRecorder::stop(), PVMediaRecorder.cpp /* 呼入OpenCore */

PVMediaRecorder::doStart()

AuthorDriver::handleStart()

PVAuthorEngine::Start(), pvauthorengine.cpp

PVAuthorEngine::DoStart()

AndroidCameraInput继承了PvmiMIOControl，因此PVAuthorEngine::DoStart()最终会呼入：

AndroidCameraInput::DoStart(), android_camera_input.cpp

mCamera->setListener(mListener); /* 设置listener。mListener为AndroidCameraInput构造函数中创建的AndroidCameraInputListener对象 */

mCamera->startRecording();

Camera::startRecording(), Camera.cpp

c->startRecording(); // sp <ICamera> c = mCamera, 为connect时创建的CameraService::Client对象

CameraService:

CameraService::Client::startRecording()

mHardware->enableMsgType(CAMERA_MSG_VIDEO_FRAME); /* enable CAMERA_MSG_VIDEO_FRAME消息 */

startCameraMode(CAMERA_RECORDING_MODE);

startRecordingMode();

mHardware->startRecording(recordingCallback, mCameraService.get()); /* 传入recordingCallback */

mRecordingCallback = cb; /* 保存cb到mRecordingCallback */

数据流向：

CameraService:

CameraHardware::previewThread()

mDataCb(CAMERA_MSG_VIDEO_FRAME, mBuffers[index], mCallbackCookie);

c->dataCallbackTimestamp(timestamp, msgType, dataPtr), CameraService.cpp

Camera::dataCallbackTimestamp()

listener->postDataTimestamp(timestamp, msgType, dataPtr);

listener为AndroidCameraInputListener对象

listener->postDataTimestamp(timestamp, msgType, dataPtr); /* listener在AndroidCameraInput::DoStart()中设置 */

AndroidCameraInputListener::postDataTimestamp(), android_camera_input.cpp

mCameraInput->postWriteAsync(timestamp, dataPtr);

AndroidCameraInput::postWriteAsync()

iFrameQueue.push_back(data);

AndroidCameraInput::Run()

iPeer->writeAsync(PVMI_MEDIAXFER_FMT_TYPE_DATA, 0, ptr,…), /* 将数据写入到iPeer中 *