layout: post title: “2024-03-04-mediaPlayer源码理解.markdown” date: 2024-03-04 12:11:30 +0800

1) 整体流程 app接受指令,并通过surface进行内容展示 app会将指令通过aidl进程间通讯传递给MediaPlayerService MediaPlayerService创建AudioTrack进行音频播放

2)

  • App端使用MediaPlayer进行内容播放
  • MediaPlayer调用c++代码frameworks\base\media\jni\android_media_MediaPlayer.cpp进行prepare等具体的操作
  • 转至frameworks\av\media\libmedia\mediaplayer.cpp
  • 调用frameworks\av\media\libmedia\IMediaDeathNotifier.cpp和MediaPlayerService进行通讯 sp sm = defaultServiceManager(); sp binder; do { binder = sm->getService(String16("media.player")); if (binder != 0) { break; } ALOGW("Media player service not published, waiting..."); usleep(500000); // 0.5 s } while (true);
  • 通过frameworks\av\media\libmediaplayerservice\MediaPlayerService.cpp创建AudioTrack t = new AudioTrack(…);