# ScreenRecorder录屏完整横竖屏

**Repository Path**: ssssssssd/ScreenRecorder

## Basic Information

- **Project Name**: ScreenRecorder录屏完整横竖屏
- **Description**: Implement screen capture without root on Android 5.0+ by using MediaProjectionManager, VirtualDisplay, AudioRecord, MediaCodec and MediaMuxer APIs
- **Primary Language**: Java
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 2
- **Created**: 2022-06-22
- **Last Updated**: 2022-07-28

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## 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）。

<img alt="screenshot" src="screenshot.png" width="50%" />

[![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