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diff --git a/media/Camera2Video/README.md b/media/Camera2Video/README.md index 543d7cda..b27ca4a1 100644 --- a/media/Camera2Video/README.md +++ b/media/Camera2Video/README.md @@ -1,15 +1,57 @@ + Android Camera2Video Sample -============================== +=================================== + +This sample shows how to record video using the new Camera2 API in Android Lollipop. + +Introduction +------------ + +Android Lollipop introduced a new camera API, called camera2. This sample uses [CameraDevice][1] +and [CameraCaptureSession][2] to record video. It also uses a custom [TextureView][3] to render the output. + +The main steps are: -This sample demonstrates how to record video using Camera2 API. +1. Create a custom TextureView class and add it to the layout. The purpose of the custom TextureView is +to be able to draw itself according to an aspect ratio, which is set via a public method. Additionally, +the `onMeasure(int widthMeasureSpec, int heightMeasureSpec)` method is overridden, using the aspect ratio. +2. Implement a `TextureView.SurfaceTextureListener` on your TextureView, and override its +`onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture, int width, int height)` method to calculate +the matrix to apply to the TextureView so the camera output fits. Use the method `setTransform(matrix)` on +the TextureView. +3. Implement a [`CameraDevice.StateCallback`][4] to receive events about changes of the state of the +camera device. Override its methods to set your CameraDevice instance, start the preview, and stop +and release the camera. +4. When starting the preview, set up the MediaRecorder to accept video format. +5. Then, set up a [`CaptureRequest.Builder`][5] using `createCaptureRequest(CameraDevice.TEMPLATE_RECORD)` +on your CameraDevice instance. +6. Then, implement a [`CameraCaptureSession.StateCallback`][6], using the method +`createCaptureSession(surfaces, new CameraCaptureSession.StateCallback(){})` on your CameraDevice instance, +where `surfaces` is a list consisting of the surface view of your TextureView and the surface of +your MediaRecorder instance. +7. Use `start()` and `stop()` methods on your MediaRecorder instance to actually start and stop the recording. +8. Lastly, set up and clean up your camera device in `onResume()` and `onPause()`. + + +[1]: https://developer.android.com/reference/android/hardware/camera2/CameraDevice.html +[2]: http://developer.android.com/reference/android/hardware/camera2/CameraCaptureSession.html +[3]: http://developer.android.com/reference/android/view/TextureView.html +[4]: https://developer.android.com/reference/android/hardware/camera2/CameraDevice.StateCallback.html +[5]: http://developer.android.com/reference/android/hardware/camera2/CaptureRequest.Builder.html +[6]: http://developer.android.com/reference/android/hardware/camera2/CameraCaptureSession.StateCallback.html Pre-requisites -------------- -- Android SDK (L Developer Preview) -- Android Build Tools v20 +- Android SDK v21 +- Android Build Tools v22.0.1 - Android Support Repository +Screenshots +------------- + +<img src="screenshots/1-launch.png" height="400" alt="Screenshot"/> <img src="screenshots/2-record.png" height="400" alt="Screenshot"/> <img src="screenshots/3-save.png" height="400" alt="Screenshot"/> + Getting Started --------------- @@ -40,7 +82,7 @@ file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at - http://www.apache.org/licenses/LICENSE-2.0 +http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |