https://github.com/yrom/ScreenRecorder

Implement screen capture without root on Android 5.0+ by using MediaProjectionManager, VirtualDisplay, AudioRecord, MediaCodec and MediaMuxer APIs
https://github.com/yrom/ScreenRecorder

android-application screen-capture

Last synced: about 2 months ago
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Implement screen capture without root on Android 5.0+ by using MediaProjectionManager, VirtualDisplay, AudioRecord, MediaCodec and MediaMuxer APIs

• Host: GitHub
• URL: https://github.com/yrom/ScreenRecorder
• Owner: yrom
• Created: 2014-11-26T15:35:43.000Z (almost 10 years ago)
• Default Branch: master
• Last Pushed: 2022-09-07T15:45:00.000Z (about 2 years ago)
• Last Synced: 2024-06-01T23:35:20.993Z (4 months ago)
• Topics: android-application, screen-capture
• Language: Java
• Homepage:
• Size: 408 KB
• Stars: 1,832
• Watchers: 75
• Forks: 526
• Open Issues: 49
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

README

        
Screen Recorder

=====

这是个DEMO APP 主要是实现了屏幕录制功能（可同时录制来自麦克风的声音）。



[![Get it on Google Play](https://play.google.com/intl/en_us/badges/images/badge_new.png)][8]  [点此处下载APK][7] 快速预览项目功能

说明：使用了 [MediaProjectionManager][1], [VirtualDisplay][2], [AudioRecord][3], [MediaCodec][4] 以及 [MediaMuxer][5] 等API，故而这个项目最低支持Android 5.0。

录屏原理

=====

** 注意 ** 你可以checkout  [32c005412](https://github.com/yrom/ScreenRecorder/tree/32c00541299e6ff56763e8f2254983008f03b24a) 查看原始的（不包含麦克风录制的）代码

- `Display` 可以“投影”到一个 `VirtualDisplay`

- 通过 `MediaProjectionManager` 取得的 `MediaProjection`创建`VirtualDisplay` 

- `VirtualDisplay` 会将图像渲染到 `Surface`中，而这个`Surface`是由`MediaCodec`所创建的

```

mEncoder = MediaCodec.createEncoderByType(MIME_TYPE);

...

mSurface = mEncoder.createInputSurface();

...

mVirtualDisplay = mMediaProjection.createVirtualDisplay(name, mWidth, mHeight, mDpi, DisplayManager.VIRTUAL_DISPLAY_FLAG_PUBLIC, mSurface, null, null);

```

- `MediaMuxer` 将从 `MediaCodec` 得到的图像元数据封装并输出到MP4文件中

```

int index = mEncoder.dequeueOutputBuffer(mBufferInfo, TIMEOUT_US);

...

ByteBuffer encodedData = mEncoder.getOutputBuffer(index);

...

mMuxer.writeSampleData(mVideoTrackIndex, encodedData, mBufferInfo);

```

所以其实在**Android 4.4**上可以通过`DisplayManager`来创建`VirtualDisplay`也是可以实现录屏，但因为权限限制需要**ROOT**。 (see [DisplayManager.createVirtualDisplay()][6])

[1]: https://developer.android.com/reference/android/media/projection/MediaProjectionManager.html

[2]: https://developer.android.com/reference/android/hardware/display/VirtualDisplay.html

[3]: https://developer.android.com/reference/android/media/AudioRecord.html

[4]: https://developer.android.com/reference/android/media/MediaCodec.html

[5]: https://developer.android.com/reference/android/media/MediaMuxer.html

[6]: https://developer.android.com/reference/android/hardware/display/DisplayManager.html

[7]: https://github.com/yrom/ScreenRecorder/releases/latest

[8]: https://play.google.com/store/apps/details?id=net.yrom.screenrecorder.demo