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AudioFlinger(AF)是一个服务,具体的代码在av\media\mediaserver\Main_mediaserver.cpp中:
int main(int argc, char** argv) { signal(SIGPIPE, SIG_IGN); char value[PROPERTY_VALUE_MAX]; bool doLog = (property_get("ro.test_harness", value, "0") > 0) && (atoi(value) == 1); pid_t childPid; // FIXME The advantage of making the process containing media.log service the parent process of // the process that contains all the other real services, is that it allows us to collect more // detailed information such as signal numbers, stop and continue, resource usage, etc. // But it is also more complex. Consider replacing this by independent processes, and using // binder on death notification instead. if (doLog && (childPid = fork()) != 0) { // media.log service //prctl(PR_SET_NAME, (unsigned long) "media.log", 0, 0, 0); // unfortunately ps ignores PR_SET_NAME for the main thread, so use this ugly hack strcpy(argv[0], "media.log"); sp<ProcessState> proc(ProcessState::self()); MediaLogService::instantiate(); ProcessState::self()->startThreadPool(); ……
sp<ProcessState> proc(ProcessState::self()); sp<IServiceManager> sm = defaultServiceManager(); ALOGI("ServiceManager: %p", sm.get()); AudioFlinger::instantiate(); MediaPlayerService::instantiate(); CameraService::instantiate(); AudioPolicyService::instantiate(); registerExtensions(); ProcessState::self()->startThreadPool(); IPCThreadState::self()->joinThreadPool(); } }
Android 4.4KitKat AudioFlinger 流程分析
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原文地址:http://www.cnblogs.com/qiengo/p/4186915.html