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UVCCamera

library and sample to access to UVC web camera on non-rooted Android device

Copyright (c) 2014-2017 saki [email protected]

Licensed 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

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

All files in the folder are under this Apache License, Version 2.0. Files in the jni/libjpeg, jni/libusb and jin/libuvc folders may have a different license, see the respective files.

How to compile library

The Gradle build system will build the entire project, including the NDK parts. If you want to build with Gradle build system,

  1. make directory on your favorite place (this directory is parent directory of UVCCamera project).
  2. change directory into the directory.
  3. clone this repository with git clone https://github.com/obraun-sl/UVCCamera.git
  4. change directory into UVCCamera directory with cd UVCCamera
  5. build library with all sample projects using gradle build

It will takes several minutes to build. Now you can see apks in each {sample project}/build/outputs/apks directory.
Or if you want to install and try all sample projects on your device, run gradle installDebug.

Note: Just make sure that local.properties contains the paths for sdk.dir and ndk.dir. Or you can set them as enviroment variables of you shell. On some system, you may need add JAVA_HOME envairoment valiable that points to JDK directory.

If you want to use Android Studio(unfortunately NDK supporting on Android Studio is very poor though),

  1. make directory on your favorite place (this directory is parent directory of UVCCamera project).
  2. change directory into the directory.
  3. clone this repository with git clone https://github.com/obraun-sl/UVCCamera.git
  4. start Android Studio and open the cloned repository using Open an existing Android Studio project
  5. Android Studio raise some errors but just ignore now. Android Studio generate local.properties file. Please open local.properties and add ndk.dir key to the end of the file. The contents of the file looks like this.
sdk.dir={path to Android SDK on your storage}
ndk.dir={path to Android SDK on your storage}

Please replace actual path to SDK and NDK on your storage.
Of course you can make local.properties by manually instead of using automatically generated ones by Android Studio. 6. Synchronize project 7. execute Make project from Build menu.

If you want to use build-in VCS on Android Studio, use Check out project from Version Control from https://github.com/obraun-sl/UVCCamera.git. After cloning, Android Studio ask you open the project but don't open now. Instead open the project using Open an existing Android Studio project. Other procedures are same as above.

If you still need to use Eclipse or if you don't want to use Gradle with some reason, you can build suing ndk-build command.

  1. make directory on your favorite place.
  2. change directory into the directory.
  3. clone this repository with git clone https://github.com/saki4510t/UVCCamera.git
  4. change directory into {UVCCamera}/libuvccamera/build/src/main/jni directory.
  5. run ndk-build
  6. resulted shared libraries are available under {UVCCamera}/libuvccamera/build/src/main/libs directory and copy them into your project with directories by manually.
  7. copy files under {UVCCamera}/libuvccamera/build/src/main/java into your project source directory by manually.

How to use

Please see sample project and/or our web site(but sorry web site is Japanese only). These sample projects are IntelliJ projects, as is the library. This library works on at least Android 3.1 or later(API >= 12), but Android 4.0(API >= 14) or later is better. USB host function must be required. If you want to try on Android 3.1, you will need some modification(need to remove setPreviewTexture method in UVCCamera.java etc.), but we have not confirm whether the sample project run on Android 3.1 yet. Some sample projects need API>=18 though.

Roadmap

-> Use cmake to generate a single libuvccamera.so (check android studio compatibility) so that it's more simple to use on a IDE. -> Integrate OpenCV into the libuvccamera.so for image processing. -> Keep one single sample, easier for maintenance...

2021

Some changes for high usb bandwidth (USB3.0 camera) for bulk transfer such as ZED Camera. (OB) Tested on Samsung S9+. Make sure to activate maximum performance on the phone otherwise it reduces the CPU to 70% ( at least it does that on the S9+)

2014/07/25

Add some modification to the library and new sample project named "USBCameraTest2". This new sample project demonstrate how to capture movie using frame data from UVC camera with MediaCodec and MediaMuxer. New sample requires at least Android 4.3(API>=18). This limitation does not come from the library itself but from the limitation of MediaMuxer and MediaCodec#createInputSurface.

2014/09/01

Add new sample project named USBCameraTest3 This new sample project demonstrate how to capture audio and movie simultaneously using frame data from UVC camera and internal mic with MediaCodec and MediaMuxer. This new sample includes still image capturing as png file.(you can easily change to save as jpeg) This sample also requires at least Android 4.3(API>=18). This limitation does not come from the library itself but from the limitation of MediaMuxer and MediaCodec#createInputSurface.

2014/11/16

Add new sample project named USBCameraTest4 This new sample project mainly demonstrate how to use offscreen rendering and record movie without any display. The communication with camera execute as Service and continue working even if you stop app. If you stop camera communication, click "stop service" button.

2014/12/17

Add bulk transfer mode and update sample projects.

2015/01/12

Add wiki page, HowTo

2015/01/22

Add method to adjust preview resolution and frame data mode.

2015/02/12

Add IFrameCallback interface to get frame data as ByteArray and new sample project USBCameraTest5 to demonstrate how to use the callback method.

2015/02/18

Add libUVCCamera as a library project(source code is almost same as previous release except Android.mk). All files and directories under library directory is deprecated.

2015/05/25

libraryProject branch merged to master.

2015/05/30

Fixed the issue that DeviceFilter class could not work well when providing venderID, productID etc.

2015/06/03

Add new sample project named USBCameraTest6 This new sample project mainly demonstrate how to show video images on two TextureView simultaneously, side by side.

2015/06/10

Fixed the issue of pixel format is wrong when NV21 mode on calling IFrameCallback#onFrame(U and V plane was swapped) and added YUV420SP mode.

2015/06/11

Improve the issue of USBCameraTest4 that fails to connect/disconnect.

2015/07/19

Add new methods to get/set camera features like brightness, contrast etc.
Add new method to get supported resolution from camera as json format.

2015/08/17

Add new sample project USBCameraTest7 to demonstrate how to use two camera at the same time.

2015/09/20

Fixed the issue that building native libraries fail on Windows.

2015/10/30

Merge pull request(add status and button callback). Thanks Alexey Pelykh.

2015/12/16

Add feature so that user can request fps range from Java code when negotiating with camera. Actual resulted fps depends on each UVC camera. Currently there is no way to get resulted fps(will add on future).

2016/03/01

update minoru001 branch, experimentaly support streo camera.

2016/06/18

replace libjpeg-turbo 1.4.0 with 1.5.0

2016/11/17

apply bandwidth factor setting of usbcameratest7 on master branch

2016/11/21

Now this repository supports Android N(7.x) and dynamic permission model of Android N and later.

2017/01/16

Add new sample app usbCameraTest8 to show how to set/get uvc control like brightness

2017/04/17

Add new sample app on OpenCVwithUVC repository. This shows the way to pass video images from UVC into cv::Mat (after optional applying video effect by OpenGL|ES) and execute image processing by OpenCV.