Android mediaRecorder框架简述(一)
最后更新于:2022-04-01 14:45:58
下面是框架简图:
![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-03-18_56eba9940b98d.jpg)
首先调用mediaRecorder.java中的方法比如start方法,会调用jni:
![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-03-18_56eba9941e691.png)
也就是调用android_media_recorder.cpp的start方法:
![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-03-18_56eba99430e90.png)
接着到mediaRecorder.cpp,mediaRecorder是由mediaplayerService创建的,而mediaRecoder.cpp和mediaplayerService是通过binder机制来进行进程间的通信的,这时client端就是通过操作服务端返回的imediaRecorder来对服务端进行控制的:
![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-03-18_56eba9944128b.png)
这里new mediaRecorderClient这是其实是创建了一个StagefrightRecorder:
![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-03-18_56eba9945761f.png)
其实我们在java层调用start就是调用了StagefrightRecorder中的strat方法,在这里我们可以看到根据传进来的mOutputFormat值(输出格式)会选择不同的编码类型的方法:
![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-03-18_56eba9946783c.png)
假如我们输出的是3gp格式,我们调用:startMPEG4Recording() 方法:
![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-03-18_56eba99486e97.png)
接着调用setupMPEG4Recording:
![](https://docs.gechiui.com/gc-content/uploads/sites/kancloud/2016-03-18_56eba9949dfb2.png)