7.7 KiB
AndroidUSBCamera
AndroidUSBCamera is developed based on the saki4510t/UVCCamera, the project of USB Camera (UVC equipment) and the use of video data acquisition are highly packaged, and it can help developers using USB Camera devices easily by a few simple APIs. By using AndroidUSBCamera,you can detect and connect to a USB Camera simply.And you also can use it to realize taking picture,recording mp4,switching resolutions ,getting h.264/aac/yuv(nv21) stream and setting camera's contrast or brightness,supporting 480P、720P、1080P and higher,etc.
Supporting Android 5.0,6.0,7.0,8.0,9.0
中文文档： AndroidUSBCamera，UVCCamera开发通用库
Usage
1.Add to your Android Studio project
Step 1. Add the JitPack repository to your build file.Add it in your root build.gradle at the end of repositories:
allprojects {
repositories {
...
maven { url 'http://raw.github.com/saki4510t/libcommon/master/repository/' }
maven { url 'https://jitpack.io' }
}
}
Step 2. Add the dependency
dependencies {
implementation 'com.github.jiangdongguo:AndroidUSBCamera:2.3.0'
}
2. APIs Introduction
(1) In order to using it correctly,the following four steps must be achieved：
mUVCCameraView = (CameraViewInterface) mTextureView;
mUVCCameraView.setCallback(mCallback);
mCameraHelper = UVCCameraHelper.getInstance();
// set default preview size
mCameraHelper.setDefaultPreviewSize(1280,720);
// set default frame format，defalut is UVCCameraHelper.Frame_FORMAT_MPEG
// if using mpeg can not record mp4,please try yuv
// mCameraHelper.setDefaultFrameFormat(UVCCameraHelper.FRAME_FORMAT_YUYV);
mCameraHelper.initUSBMonitor(this, mUVCCameraView, mDevConnectListener);
To be attention,mCallback is a object of interface CameraViewInterface.Callback,and it's used to be listenering surfaceView created or detoryed.mDevConnectListener is a object of interface UVCCameraHelper.OnMyDevConnectListener,and it's used to be listenering to detect and conntect USB device.Here is the coding order:
private CameraViewInterface.Callback mCallback = new CameraViewInterface.Callback mCallback(){
@Override
public void onSurfaceCreated(CameraViewInterface view, Surface surface) {
// must have
if (!isPreview && mCameraHelper.isCameraOpened()) {
mCameraHelper.startPreview(mUVCCameraView);
isPreview = true;
}
}
@Override
public void onSurfaceChanged(CameraViewInterface view, Surface surface, int width, int height) {
}
@Override
public void onSurfaceDestroy(CameraViewInterface view, Surface surface) {
// must have
if (isPreview && mCameraHelper.isCameraOpened()) {
mCameraHelper.stopPreview();
isPreview = false;
}
}
}
private UVCCameraHelper.OnMyDevConnectListener listener = new UVCCameraHelper.OnMyDevConnectListener() {
@Override
public void onAttachDev(UsbDevice device) {
// request open permission(must have)
if (!isRequest) {
isRequest = true;
if (mCameraHelper != null) {
mCameraHelper.requestPermission(0);
}
}
}
@Override
public void onDettachDev(UsbDevice device) {
// close camera(must have)
if (isRequest) {
isRequest = false;
mCameraHelper.closeCamera();
}
}
@Override
public void onConnectDev(UsbDevice device, boolean isConnected) {
}
@Override
public void onDisConnectDev(UsbDevice device) {
}
};
(2) Capturing JPG Images
mCameraHelper.capturePicture(picPath, new AbstractUVCCameraHandler.OnCaptureListener() {
@Override
public void onCaptureResult(String path) {
Log.i(TAG,"save path：" + path);
}
});
(3) Recording Mp4,supporting close voice and save file automatic.
RecordParams params = new RecordParams();
params.setRecordPath(videoPath);
params.setRecordDuration(0); // 0,do not cut save
params.setVoiceClose(mSwitchVoice.isChecked()); // is close voice
mCameraHelper.startPusher(params, new AbstractUVCCameraHandler.OnEncodeResultListener() {
@Override
public void onEncodeResult(byte[] data, int offset, int length, long timestamp, int type) {
// type = 1,h264 video stream
if (type == 1) {
// FileUtils.putFileStream(data, offset, length);
}
// type = 0,aac audio stream
if(type == 0) {
}
}
@Override
public void onRecordResult(String videoPath) {
Log.i(TAG,"videoPath = "+videoPath);
}
});
// of course,if you only want to getting h.264 and aac stream
// you can do like this
mCameraHelper.startPusher(listener);
(4) setting camera's brightness and contrast.
mCameraHelper.setModelValue(UVCCameraHelper.MODE_BRIGHTNESS,progress);
mCameraHelper.setModelValue(UVCCameraHelper.MODE_CONTRAST,progress);
mCameraHelper.getModelValue(UVCCameraHelper.MODE_BRIGHTNESS);
mCameraHelper.getModelValue(UVCCameraHelper.MODE_CONTRAST);
...
(5) switch resolutions and camera.
mCameraHelper.updateResolution(widht, height);
At last,remember adding permissions:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
3. Solving Problems
- connected,but preview failed
Please checking your preview format and change YUV to MJPEG or MJPEG to YUV,because some usb devices only supporting YUV
- never found the device
-
confirm your phone support otg
-
get a file from your sd card named failed-device.txt in the path of root sd card/UsbCamera/failed-device.txt and tell me
Other Library about Android Camera
OkCamera Android Camera univsersally operation.
AndroidRecordMp4 Using MediaCodec realize record mp4.
AndroidYuvOsd YUV data operation.
Lame4Mp3 pcm to mp3 and pcm to aac.
License
Copyright 2018 Jiangdongguo
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.