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All Projects → yrom → Screenrecorder

yrom / Screenrecorder

Implement screen capture without root on Android 5.0+ by using MediaProjectionManager, VirtualDisplay, AudioRecord, MediaCodec and MediaMuxer APIs

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android-applicationscreen-capture

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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）。

screenshot

Get it on Google Play 点此处下载APK 快速预览项目功能

说明：使用了 MediaProjectionManager, VirtualDisplay, AudioRecord, MediaCodec 以及 MediaMuxer 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 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())

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