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android6.0源码分析之Camera2 HAL分析

發(fā)布時間：2025/3/15 编程问答 31 豆豆

生活随笔收集整理的這篇文章主要介紹了 android6.0源码分析之Camera2 HAL分析小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

1、Camera HAL的初始化

Camera HAL的初始加載是在Native的CameraService初始化流程中的，而CameraService初始化是在Main_mediaServer.cpp的main方法開始的：

其中，CameraService繼承自BinderService，instantiate也是在BinderService中定義的，此方法就是調用publish方法，所以來看publish方法：

<code class="hljs scss has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">// BinderService.h static status_t publish(bool allowIsolated = false) {sp<IServiceManager> sm(defaultServiceManager());//將服務添加到ServiceManagerreturn sm->addService(String16(SERVICE::getServiceName()),new SERVICE(), allowIsolated); }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul>

這里，將會把CameraService服務加入到ServiceManager進行管理。?
而在前面的文章android6.0源碼分析之Camera API2.0簡介中，需要通過Java層的IPC Binder來獲取此CameraService對象，在此過程中會初始CameraService的sp類型的對象，而對于sp，此處不做過多的分析，具體的可以查看深入理解Android卷Ⅰ中的第五章中的相關內容。此處，在CameraService的構造時，會調用CameraService的onFirstRef方法：

<code class="hljs r has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">//CameraService.cpp void CameraService::onFirstRef() {BnCameraService::onFirstRef();...camera_module_t *rawModule;//根據CAMERA_HARDWARE_MODULE_ID(字符串camera)來獲取camera_module_t對象int err = hw_get_module(CAMERA_HARDWARE_MODULE_ID,(const hw_module_t **)&rawModule);//創(chuàng)建CameraModule對象mModule = new CameraModule(rawModule);//模塊初始化err = mModule->init();...//通過Module獲取Camera的數量mNumberOfCameras = mModule->getNumberOfCameras();mNumberOfNormalCameras = mNumberOfCameras;//初始化閃光燈mFlashlight = new CameraFlashlight(*mModule, *this);status_t res = mFlashlight->findFlashUnits();int latestStrangeCameraId = INT_MAX;for (int i = 0; i < mNumberOfCameras; i++) {//初始化CameraIDString8 cameraId = String8::format("%d", i);struct camera_info info;bool haveInfo = true;//獲取Camera信息status_t rc = mModule->getCameraInfo(i, &info);...//如果Module版本高于2.4，找出沖突的設備參數if (mModule->getModuleApiVersion() >= CAMERA_MODULE_API_VERSION_2_4 && haveInfo) {cost = info.resource_cost;conflicting_devices = info.conflicting_devices;conflicting_devices_length = info.conflicting_devices_length;}//將沖突設備加入沖突set集中std::set<String8> conflicting;for (size_t i = 0; i < conflicting_devices_length; i++) {conflicting.emplace(String8(conflicting_devices[i]));}...}//如果Module的API大于2.1，則設置回調if (mModule->getModuleApiVersion() >= CAMERA_MODULE_API_VERSION_2_1) {mModule->setCallbacks(this);}//若大于2.2，則設置供應商的Tagif (mModule->getModuleApiVersion() >= CAMERA_MODULE_API_VERSION_2_2) {setUpVendorTags();}//將此服務注冊到CameraDeviceFactoryCameraDeviceFactory::registerService(this);CameraService::pingCameraServiceProxy(); }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; 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padding: 0px 5px;">56</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; 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onFirstRef方法中，首先會通過HAL框架的hw_get_module來獲取CameraModule對象，然后會對其進行相應的初始化，并會進行一些參數的設置，如camera的數量，閃光燈的初始化，以及回調函數的設置等，到這里，Camera2 HAL的模塊就初始化結束了，下面給出初始化時序圖：?

2、Camera HAL的open流程分析

通過閱讀android6.0源碼發(fā)現，它提供了高通的Camera實現，并且提供了高通的Camera庫，也實現了高通的Camera HAL的相應接口，對于高通的Camera，它在后臺會有一個守護進程daemon，daemon是介于應用和驅動之間翻譯ioctl的中間層(委托處理)。本節(jié)將以Camera中的open流程為例，來分析Camera HAL的工作過程，在應用對硬件發(fā)出open請求后，會通過Camera HAL來發(fā)起open請求，而Camera HAL的open入口在QCamera2Hal.cpp進行了定義：

<code class="hljs lasso has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">//QCamera2Hal.cpp camera_module_t HAL_MODULE_INFO_SYM = {//它里面包含模塊的公共方法信息common: camera_common,get_number_of_cameras: qcamera::QCamera2Factory::get_number_of_cameras,get_camera_info: qcamera::QCamera2Factory::get_camera_info,set_callbacks: qcamera::QCamera2Factory::set_callbacks,get_vendor_tag_ops: qcamera::QCamera3VendorTags::get_vendor_tag_ops,open_legacy: qcamera::QCamera2Factory::open_legacy,set_torch_mode: NULL,init : NULL,reserved: {0} };static hw_module_t camera_common = {tag: HARDWARE_MODULE_TAG,module_api_version: CAMERA_MODULE_API_VERSION_2_3,hal_api_version: HARDWARE_HAL_API_VERSION,id: CAMERA_HARDWARE_MODULE_ID,name: "QCamera Module",author: "Qualcomm Innovation Center Inc",//它的方法數組里綁定了open接口methods: &qcamera::QCamera2Factory::mModuleMethods,dso: NULL,reserved: {0} }; struct hw_module_methods_t QCamera2Factory::mModuleMethods = {//open方法的綁定open: QCamera2Factory::camera_device_open, };</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; 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Camera HAL層的open入口其實就是camera_device_open方法：

它調用了cameraDeviceOpen方法，而其中的hw_device就是最后要返回給應用層的CameraDeviceImpl在Camera HAL層的對象，繼續(xù)分析cameraDeviceOpen方法：

此方法有兩個關鍵點：一個是QCamera3HardwareInterface對象的創(chuàng)建，它是用戶空間與內核空間進行交互的接口；另一個是調用它的openCamera方法來打開Camera，下面將分別進行分析。

2.1 QCamera3HardwareInterface構造函數分析

在它的構造函數里面有一個關鍵的初始化，即mCameraDevice.ops = &mCameraOps，它會定義Device操作的接口：

其中，會在configure_streams中配置好流的處理handle：

繼續(xù)追蹤configureStream方法：

<code class="hljs cpp has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">//QCamera3HWI.cpp int QCamera3HardwareInterface::configureStreams(camera3_stream_configuration_t *streamList){...//初始化Camera版本al_version = CAM_HAL_V3;...//開始配置stream...//初始化相關Channel為NULLif (mMetadataChannel) {delete mMetadataChannel;mMetadataChannel = NULL;}if (mSupportChannel) {delete mSupportChannel;mSupportChannel = NULL;}if (mAnalysisChannel) {delete mAnalysisChannel;mAnalysisChannel = NULL;}//創(chuàng)建Metadata Channel，并對其進行初始化mMetadataChannel = new QCamera3MetadataChannel(mCameraHandle->camera_handle,mCameraHandle->ops, captureResultCb,&gCamCapability[mCameraId]->padding_info, CAM_QCOM_FEATURE_NONE, this);...//初始化rc = mMetadataChannel->initialize(IS_TYPE_NONE);...//如果h/w support可用，則創(chuàng)建分析stream的Channelif (gCamCapability[mCameraId]->hw_analysis_supported) {mAnalysisChannel = new QCamera3SupportChannel(mCameraHandle->camera_handle,mCameraHandle->ops,&gCamCapability[mCameraId]->padding_info,CAM_QCOM_FEATURE_PP_SUPERSET_HAL3,CAM_STREAM_TYPE_ANALYSIS,&gCamCapability[mCameraId]->analysis_recommended_res,this);...}bool isRawStreamRequested = false;//清空stream配置信息memset(&mStreamConfigInfo, 0, sizeof(cam_stream_size_info_t));//為requested stream分配相關的channel對象for (size_t i = 0; i < streamList->num_streams; i++) {camera3_stream_t *newStream = streamList->streams[i];uint32_t stream_usage = newStream->usage;mStreamConfigInfo.stream_sizes[mStreamConfigInfo.num_streams].width = (int32_t)newStream->width;mStreamConfigInfo.stream_sizes[mStreamConfigInfo.num_streams].height = (int32_t)newStream->height;if ((newStream->stream_type == CAMERA3_STREAM_BIDIRECTIONAL||newStream->usage & GRALLOC_USAGE_HW_CAMERA_ZSL) &&newStream->format == HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED && jpegStream){mStreamConfigInfo.type[mStreamConfigInfo.num_streams] = CAM_STREAM_TYPE_SNAPSHOT;mStreamConfigInfo.postprocess_mask[mStreamConfigInfo.num_streams] = CAM_QCOM_FEATURE_NONE;} else if(newStream->stream_type == CAMERA3_STREAM_INPUT) {} else {switch (newStream->format) {//為非zsl streams查找他們的format...}}if (newStream->priv == NULL) {//為新的stream構造Channelswitch (newStream->stream_type) {//分類型構造case CAMERA3_STREAM_INPUT:newStream->usage |= GRALLOC_USAGE_HW_CAMERA_READ;newStream->usage |= GRALLOC_USAGE_HW_CAMERA_WRITE;//WR for inplace algo'sbreak;case CAMERA3_STREAM_BIDIRECTIONAL:...break;case CAMERA3_STREAM_OUTPUT:...break;default:break;}//根據前面的得到的stream的參數類型以及format分別對各類型的channel進行構造if (newStream->stream_type == CAMERA3_STREAM_OUTPUT ||newStream->stream_type == CAMERA3_STREAM_BIDIRECTIONAL) {QCamera3Channel *channel = NULL;switch (newStream->format) {case HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED:/* use higher number of buffers for HFR mode */...//創(chuàng)建Regular Channelchannel = new QCamera3RegularChannel(mCameraHandle->camera_handle,mCameraHandle->ops, captureResultCb,&gCamCapability[mCameraId]->padding_info,this,newStream,(cam_stream_type_t)mStreamConfigInfo.type[mStreamConfigInfo.num_streams],mStreamConfigInfo.postprocess_mask[mStreamConfigInfo.num_streams],mMetadataChannel,numBuffers);...newStream->max_buffers = channel->getNumBuffers();newStream->priv = channel;break;case HAL_PIXEL_FORMAT_YCbCr_420_888://創(chuàng)建YWV Channel...break;case HAL_PIXEL_FORMAT_RAW_OPAQUE:case HAL_PIXEL_FORMAT_RAW16:case HAL_PIXEL_FORMAT_RAW10://創(chuàng)建Raw Channel...break;case HAL_PIXEL_FORMAT_BLOB://創(chuàng)建QCamera3PicChannel...break;default:break;}} else if (newStream->stream_type == CAMERA3_STREAM_INPUT) {newStream->max_buffers = MAX_INFLIGHT_REPROCESS_REQUESTS;} else {}for (List<stream_info_t*>::iterator it=mStreamInfo.begin();it != mStreamInfo.end(); it++) {if ((*it)->stream == newStream) {(*it)->channel = (QCamera3Channel*) newStream->priv;break;}}} else {}if (newStream->stream_type != CAMERA3_STREAM_INPUT)mStreamConfigInfo.num_streams++;}}if (isZsl) {if (mPictureChannel) {mPictureChannel->overrideYuvSize(zslStream->width, zslStream->height);}} else if (mPictureChannel && m_bIs4KVideo) {mPictureChannel->overrideYuvSize(videoWidth, videoHeight);}//RAW DUMP channelif (mEnableRawDump && isRawStreamRequested == false){cam_dimension_t rawDumpSize;rawDumpSize = getMaxRawSize(mCameraId);mRawDumpChannel = new QCamera3RawDumpChannel(mCameraHandle->camera_handle,mCameraHandle->ops,rawDumpSize,&gCamCapability[mCameraId]->padding_info,this, CAM_QCOM_FEATURE_NONE);...}//進行相關Channel的配置.../* Initialize mPendingRequestInfo and mPendnigBuffersMap */for (List<PendingRequestInfo>::iterator i = mPendingRequestsList.begin();i != mPendingRequestsList.end(); i++) {clearInputBuffer(i->input_buffer);i = mPendingRequestsList.erase(i);}mPendingFrameDropList.clear();// Initialize/Reset the pending buffers listmPendingBuffersMap.num_buffers = 0;mPendingBuffersMap.mPendingBufferList.clear();mPendingReprocessResultList.clear();return rc; }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; 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padding: 0px 5px;">97</li><li style="box-sizing: border-box; padding: 0px 5px;">98</li><li style="box-sizing: border-box; padding: 0px 5px;">99</li><li style="box-sizing: border-box; padding: 0px 5px;">100</li><li style="box-sizing: border-box; padding: 0px 5px;">101</li><li style="box-sizing: border-box; padding: 0px 5px;">102</li><li style="box-sizing: border-box; padding: 0px 5px;">103</li><li style="box-sizing: border-box; padding: 0px 5px;">104</li><li style="box-sizing: border-box; padding: 0px 5px;">105</li><li style="box-sizing: border-box; padding: 0px 5px;">106</li><li style="box-sizing: border-box; padding: 0px 5px;">107</li><li style="box-sizing: border-box; padding: 0px 5px;">108</li><li style="box-sizing: border-box; padding: 0px 5px;">109</li><li style="box-sizing: border-box; padding: 0px 5px;">110</li><li style="box-sizing: border-box; padding: 0px 5px;">111</li><li style="box-sizing: border-box; padding: 0px 5px;">112</li><li style="box-sizing: border-box; padding: 0px 5px;">113</li><li style="box-sizing: border-box; padding: 0px 5px;">114</li><li style="box-sizing: border-box; padding: 0px 5px;">115</li><li style="box-sizing: border-box; padding: 0px 5px;">116</li><li style="box-sizing: border-box; padding: 0px 5px;">117</li><li style="box-sizing: border-box; padding: 0px 5px;">118</li><li style="box-sizing: border-box; padding: 0px 5px;">119</li><li style="box-sizing: border-box; padding: 0px 5px;">120</li><li style="box-sizing: border-box; padding: 0px 5px;">121</li><li style="box-sizing: border-box; padding: 0px 5px;">122</li><li style="box-sizing: border-box; padding: 0px 5px;">123</li><li style="box-sizing: border-box; padding: 0px 5px;">124</li><li style="box-sizing: border-box; padding: 0px 5px;">125</li><li style="box-sizing: border-box; padding: 0px 5px;">126</li><li style="box-sizing: border-box; padding: 0px 5px;">127</li><li style="box-sizing: border-box; padding: 0px 5px;">128</li><li style="box-sizing: border-box; padding: 0px 5px;">129</li><li style="box-sizing: border-box; padding: 0px 5px;">130</li><li style="box-sizing: border-box; padding: 0px 5px;">131</li><li style="box-sizing: border-box; padding: 0px 5px;">132</li><li style="box-sizing: border-box; padding: 0px 5px;">133</li><li style="box-sizing: border-box; padding: 0px 5px;">134</li><li style="box-sizing: border-box; padding: 0px 5px;">135</li><li style="box-sizing: border-box; padding: 0px 5px;">136</li><li style="box-sizing: border-box; padding: 0px 5px;">137</li><li style="box-sizing: border-box; padding: 0px 5px;">138</li><li style="box-sizing: border-box; padding: 0px 5px;">139</li><li style="box-sizing: border-box; padding: 0px 5px;">140</li><li style="box-sizing: border-box; padding: 0px 5px;">141</li><li style="box-sizing: border-box; padding: 0px 5px;">142</li><li style="box-sizing: border-box; padding: 0px 5px;">143</li><li style="box-sizing: border-box; padding: 0px 5px;">144</li><li style="box-sizing: border-box; padding: 0px 5px;">145</li><li style="box-sizing: border-box; padding: 0px 5px;">146</li><li style="box-sizing: border-box; padding: 0px 5px;">147</li><li style="box-sizing: border-box; padding: 0px 5px;">148</li><li style="box-sizing: border-box; padding: 0px 5px;">149</li><li style="box-sizing: border-box; padding: 0px 5px;">150</li><li style="box-sizing: border-box; padding: 0px 5px;">151</li><li style="box-sizing: border-box; padding: 0px 5px;">152</li><li style="box-sizing: border-box; padding: 0px 5px;">153</li><li style="box-sizing: border-box; padding: 0px 5px;">154</li><li style="box-sizing: border-box; padding: 0px 5px;">155</li><li style="box-sizing: border-box; padding: 0px 5px;">156</li><li style="box-sizing: border-box; padding: 0px 5px;">157</li><li style="box-sizing: border-box; padding: 0px 5px;">158</li><li style="box-sizing: border-box; padding: 0px 5px;">159</li><li style="box-sizing: border-box; padding: 0px 5px;">160</li><li style="box-sizing: border-box; padding: 0px 5px;">161</li><li style="box-sizing: border-box; padding: 0px 5px;">162</li><li style="box-sizing: border-box; padding: 0px 5px;">163</li><li style="box-sizing: border-box; padding: 0px 5px;">164</li><li style="box-sizing: border-box; padding: 0px 5px;">165</li></ul>

此方法內容比較多，只抽取其中核心的代碼進行說明，它首先會根據HAL的版本來對stream進行相應的配置初始化，然后再根據stream類型對stream_list的stream創(chuàng)建相應的Channel，主要有QCamera3MetadataChannel，QCamera3SupportChannel等，然后再進行相應的配置，其中QCamera3MetadataChannel在后面的處理capture request的時候會用到，這里就不做分析，而Camerametadata則是Java層和CameraService之間傳遞的元數據，見android6.0源碼分析之Camera API2.0簡介中的Camera2架構圖，至此，QCamera3HardwareInterface構造結束，與本文相關的就是配置了mCameraDevice.ops。

2.2 openCamera分析

本節(jié)主要分析Module是如何打開Camera的，openCamera的代碼如下：

<code class="hljs objectivec has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">//QCamera3HWI.cpp int QCamera3HardwareInterface::openCamera(struct hw_device_t **hw_device){int rc = 0;if (mCameraOpened) {//如果Camera已經被打開，則此次打開的設備為NULL，并且打開結果為PERMISSION_DENIED*hw_device = NULL;return PERMISSION_DENIED;}//調用openCamera方法來打開rc = openCamera();//打開結果處理if (rc == 0) {//獲取打開成功的hw_device_t對象*hw_device = &mCameraDevice.common;} else*hw_device = NULL;}return rc; }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li></ul>

它調用了openCamera()方法來打開Camera:

它調用camera_open方法來打開Camera，并且向CameraHandle注冊了Camera 時間處理的Handle–camEvtHandle，首先分析camera_open方法，這里就將進入高通的Camera的實現了，而Mm_camera_interface.c是高通提供的相關操作的接口，接下來分析高通Camera的camera_open方法：

由代碼可知，這里將會初始化一個mm_camera_obj_t對象，其中，ds_fd為socket fd，而mm_camera_ops則綁定了相關的接口，最后調用mm_camera_open來打開Camera，首先來看看mm_camera_ops綁定了哪些方法：

<code class="hljs autohotkey has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">//Mm_camera_interface.c static mm_camera_ops_t mm_camera_ops = {.query_capability = mm_camera_intf_query_capability,//注冊事件通知的方法.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,.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,//配置stream的方法.config_stream = mm_camera_intf_config_stream,.qbuf = mm_camera_intf_qbuf,.get_queued_buf_count = mm_camera_intf_get_queued_buf_count,.map_stream_buf = mm_camera_intf_map_stream_buf,.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,//處理capture的方法.process_advanced_capture = mm_camera_intf_process_advanced_capture };</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li></ul>

接著分析mm_camera_open方法：

由代碼可知，它會打開Camera的設備文件，然后開啟dispatch_app_event線程，線程方法體mm_camera_dispatch_app_event方法代碼如下：

<code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">//Mm_camera.c static void mm_camera_dispatch_app_event(mm_camera_cmdcb_t *cmd_cb,void* user_data){mm_camera_cmd_thread_name("mm_cam_event");int i;mm_camera_event_t *event = &cmd_cb->u.evt;mm_camera_obj_t * my_obj = (mm_camera_obj_t *)user_data;if (NULL != my_obj) {pthread_mutex_lock(&my_obj->cb_lock);for(i = 0; i < MM_CAMERA_EVT_ENTRY_MAX; i++) {if(my_obj->evt.evt[i].evt_cb) {//調用camEvtHandle方法my_obj->evt.evt[i].evt_cb(my_obj->my_hdl,event,my_obj->evt.evt[i].user_data);}}pthread_mutex_unlock(&my_obj->cb_lock);} }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li></ul>

最后會調用mm-camera-interface中注冊好的事件處理evt_cb，它就是在前面注冊好的camEvtHandle：

<code class="hljs lasso has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">//QCamera3HWI.cpp void QCamera3HardwareInterface::camEvtHandle(uint32_t /*camera_handle*/,mm_camera_event_t *evt,void *user_data){//獲取QCamera3HardwareInterface接口指針QCamera3HardwareInterface *obj = (QCamera3HardwareInterface *)user_data;if (obj && evt) {switch(evt->server_event_type) {case CAM_EVENT_TYPE_DAEMON_DIED:camera3_notify_msg_t notify_msg;memset(&notify_msg, 0, sizeof(camera3_notify_msg_t));notify_msg.type = CAMERA3_MSG_ERROR;notify_msg.message.error.error_code = CAMERA3_MSG_ERROR_DEVICE;notify_msg.message.error.error_stream = NULL;notify_msg.message.error.frame_number = 0;obj->mCallbackOps->notify(obj->mCallbackOps, &notify_msg);break;case CAM_EVENT_TYPE_DAEMON_PULL_REQ:pthread_mutex_lock(&obj->mMutex);obj->mWokenUpByDaemon = true;//開啟process_capture_requestobj->unblockRequestIfNecessary();pthread_mutex_unlock(&obj->mMutex);break; default:break;}} else {} }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li></ul>

由代碼可知，它會調用QCamera3HardwareInterface的unblockRequestIfNecessary來發(fā)起結果處理請求：

在初始化QCamera3HardwareInterface對象的時候，就綁定了處理Metadata的回調captureResultCb方法：它主要是對數據源進行相應的處理，而具體的capture請求的結果處理還是由process_capture_request來進行處理的，而這里會調用方法unblockRequestIfNecessary來觸發(fā)process_capture_request方法執(zhí)行，而在Camera框架中，發(fā)起請求時會啟動一個RequestThread線程，在它的threadLoop方法中，會不停的調用process_capture_request方法來進行請求的處理，而它最后會回調Camera3Device中的processCaptureResult方法來進行結果處理：

<code class="hljs r has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">//Camera3Device.cpp void Camera3Device::processCaptureResult(const camera3_capture_result *result) {...{...if (mUsePartialResult && result->result != NULL) {if (mDeviceVersion >= CAMERA_DEVICE_API_VERSION_3_2) {...if (isPartialResult) {request.partialResult.collectedResult.append(result->result);}} else {camera_metadata_ro_entry_t partialResultEntry;res = find_camera_metadata_ro_entry(result->result,ANDROID_QUIRKS_PARTIAL_RESULT, &partialResultEntry);if (res != NAME_NOT_FOUND &&partialResultEntry.count > 0 &&partialResultEntry.data.u8[0] ==ANDROID_QUIRKS_PARTIAL_RESULT_PARTIAL) {isPartialResult = true;request.partialResult.collectedResult.append(result->result);request.partialResult.collectedResult.erase(ANDROID_QUIRKS_PARTIAL_RESULT);}}if (isPartialResult) {// Fire off a 3A-only result if possibleif (!request.partialResult.haveSent3A) {//處理3A結果request.partialResult.haveSent3A =processPartial3AResult(frameNumber,request.partialResult.collectedResult,request.resultExtras);}}}...//查找camera元數據入口camera_metadata_ro_entry_t entry;res = find_camera_metadata_ro_entry(result->result,ANDROID_SENSOR_TIMESTAMP, &entry);if (shutterTimestamp == 0) {request.pendingOutputBuffers.appendArray(result->output_buffers,result->num_output_buffers);} else {重要的分析//返回處理的outputbufferreturnOutputBuffers(result->output_buffers,result->num_output_buffers, shutterTimestamp);}if (result->result != NULL && !isPartialResult) {if (shutterTimestamp == 0) {request.pendingMetadata = result->result;request.partialResult.collectedResult = collectedPartialResult;} else {CameraMetadata metadata;metadata = result->result;//發(fā)送Capture結構，即調用通知回調sendCaptureResult(metadata, request.resultExtras,collectedPartialResult, frameNumber, hasInputBufferInRequest,request.aeTriggerCancelOverride);}}removeInFlightRequestIfReadyLocked(idx);} // scope for mInFlightLockif (result->input_buffer != NULL) {if (hasInputBufferInRequest) {Camera3Stream *stream =Camera3Stream::cast(result->input_buffer->stream);重要的分析//返回處理的inputbufferres = stream->returnInputBuffer(*(result->input_buffer));} else {}} }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; 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padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li><li style="box-sizing: border-box; padding: 0px 5px;">70</li><li style="box-sizing: border-box; padding: 0px 5px;">71</li><li style="box-sizing: border-box; padding: 0px 5px;">72</li><li style="box-sizing: border-box; padding: 0px 5px;">73</li><li style="box-sizing: border-box; padding: 0px 5px;">74</li><li style="box-sizing: border-box; padding: 0px 5px;">75</li></ul>

分析returnOutputBuffers方法，inputbuffer的runturnInputBuffer方法流程類似：

方法里調用了returnBuffer方法：

再繼續(xù)看returnBufferLocked,它調用了returnAnyBufferLocked方法，而returnAnyBufferLocked方法又調用了returnBufferCheckedLocked方法，現在分析returnBufferCheckedLocked：

由代碼可知，如果Buffer沒有出現狀態(tài)錯誤，它會調用currentConsumer的queueBuffer方法，而具體的Consumer則是在應用層初始化Camera時進行綁定的，典型的Consumer有SurfaceTexture，ImageReader等，而在Native層中，它會調用BufferQueueProducer的queueBuffer方法：

<code class="hljs r has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">// BufferQueueProducer.cpp status_t BufferQueueProducer::queueBuffer(int slot,const QueueBufferInput &input, QueueBufferOutput *output) {...//初始化Frame可用的監(jiān)聽器sp<IConsumerListener> frameAvailableListener;sp<IConsumerListener> frameReplacedListener;int callbackTicket = 0;BufferItem item;{ // Autolock scope...const sp<GraphicBuffer>& graphicBuffer(mSlots[slot].mGraphicBuffer);Rect bufferRect(graphicBuffer->getWidth(), graphicBuffer->getHeight());Rect croppedRect;crop.intersect(bufferRect, &croppedRect);...//如果隊列為空if (mCore->mQueue.empty()) {mCore->mQueue.push_back(item);frameAvailableListener = mCore->mConsumerListener;} else {//否則，不為空，對Buffer進行處理，并獲取FrameAvailableListener監(jiān)聽BufferQueueCore::Fifo::iterator front(mCore->mQueue.begin());if (front->mIsDroppable) {if (mCore->stillTracking(front)) {mSlots[front->mSlot].mBufferState = BufferSlot::FREE;mCore->mFreeBuffers.push_front(front->mSlot);}*front = item;frameReplacedListener = mCore->mConsumerListener;} else {mCore->mQueue.push_back(item);frameAvailableListener = mCore->mConsumerListener;}}mCore->mBufferHasBeenQueued = true;mCore->mDequeueCondition.broadcast();output->inflate(mCore->mDefaultWidth, mCore->mDefaultHeight,mCore->mTransformHint,static_cast<uint32_t>(mCore->mQueue.size()));// Take a ticket for the callback functionscallbackTicket = mNextCallbackTicket++;mCore->validateConsistencyLocked();} // Autolock scope...{...if (frameAvailableListener != NULL) {//回調SurfaceTexture中定義好的監(jiān)聽IConsumerListener的onFrameAvailable方法來對數據進行處理frameAvailableListener->onFrameAvailable(item);} else if (frameReplacedListener != NULL) {frameReplacedListener->onFrameReplaced(item);}++mCurrentCallbackTicket;mCallbackCondition.broadcast();}return NO_ERROR; }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li></ul>

由代碼可知，它最后會調用Consumer的回調FrameAvailableListener的onFrameAvailable方法，到這里，就比較清晰為什么我們在寫Camera應用，為其初始化Surface時，我們需要重寫FrameAvailableListener了，因為在此方法里面，會進行結果的處理，至此，Camera HAL的Open流程就分析結束了。下面給出流程的時序圖：?

原文地址：　http://blog.csdn.net/yangzhihuiguming/article/details/51831888

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源码
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