multimedia 各种server 在frameworks层的起始处

multimedia, 包含了audio的AudioFlinger, video的mediaservice 和 camera的cameraservice. 他们在frameworks层最上面起始调用位于：
frameworks/base/media/mediaserver/main_mediaserver.cp
代码如下：

/*
    **
    ** Copyright 2008, The Android Open Source Project
    **
    ** Licensed under the Apache License, Version 2.0 (the "License");
    ** you may not use this file except in compliance with the License.
    ** You may obtain a copy of the License at
    **
    ** http://www.apache.org/licenses/LICENSE-2.0
    **
    ** Unless required by applicable law or agreed to in writing, software
    ** distributed under the License is distributed on an "AS IS" BASIS,
    ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    ** See the License for the specific language governing permissions and
    ** limitations under the License.
    */
    // System headers required for setgroups, etc.
    #include <sys/types.h>
    #include <unistd.h>
    #include <grp.h>
    #include <binder/IPCThreadState.h>
    #include <binder/ProcessState.h>
    #include <binder/IServiceManager.h>
    #include <utils/Log.h>
    #include <AudioFlinger.h>
    #include <CameraService.h>
    #include <MediaPlayerService.h>
    #include <AudioPolicyService.h>
    #include <private/android_filesystem_config.h>
    using namespace android;
    int main(int argc, char** argv)
    {
        sp<ProcessState> proc(ProcessState::self());
        sp<IServiceManager> sm = defaultServiceManager();
        LOGI("ServiceManager: %p", sm.get());    //下面这几个service，统称为ServiceManager.
    // AudioFlinger::instantiate();
    // MediaPlayerService::instantiate();
    // CameraService::instantiate();
    // AudioPolicyService::instantiate();
    // ProcessState::self()->startThreadPool();
    // IPCThreadState::self()->joinThreadPool();
    }

因为要调试audio驱动， 所以在这里把AudioFlinger, MediaPlayerService, CameraService, AudioPolicyService 都关掉了。