企业创建网站,搬瓦工可以长期做网站,惠州住房和城乡建设部网站,photoshop基础入门教程Android在后台读取UVC摄像头的帧数据流并推送 添加UvcCamera依赖库 使用原版的 saki4510t/UVCCamera 在预览过程中断开可能会闪退#xff0c;这里使用的是 jiangdongguo/AndroidUSBCamera 中修改的版本#xff0c;下载到本地即可。 https://github.com/jiangdongguo/AndroidU…Android在后台读取UVC摄像头的帧数据流并推送 添加UvcCamera依赖库 使用原版的 saki4510t/UVCCamera 在预览过程中断开可能会闪退这里使用的是 jiangdongguo/AndroidUSBCamera 中修改的版本下载到本地即可。 https://github.com/jiangdongguo/AndroidUSBCamera 监听UVC连接回调 mUSBMonitor USBMonitor(context, mOnDeviceConnectListener)mUSBMonitor.register()public interface OnDeviceConnectListener {void onAttach(UsbDevice device);void onDetach(UsbDevice device);void onConnect(UsbDevice device, UsbControlBlock ctrlBlock, boolean createNew);void onDisconnect(UsbDevice device, UsbControlBlock ctrlBlock);void onCancel(UsbDevice device);}检测到UVC后连接该设备
USB连接上会回调onAttach, 本地判断连接上的USB设备是否UVC,如果是的话可以尝试调用连接该对象。调用mUSBMonitor.requestPermission(cam)就会请求权限并且连接该对象。连接成功后会回调 onConnect。 var connectJob: Disposable? nulloverride fun onAttach(device: UsbDevice?) {BLLog.i(TAG, onAttach)BLLog.toast(USB_DEVICE_ATTACHED)connectJob?.dispose()connectJob CommonUtils.runDelayed(1000) {autoConnectUvcDevice()}}private fun autoConnectUvcDevice() {val context BLSession.getApplicationContext()val filter: ListDeviceFilter DeviceFilter.getDeviceFilters(context, R.xml.device_filter_uvc)val devs: ListUsbDevice mUSBMonitor?.getDeviceList(filter[0]) ?: listOf()val cam findUsbCam(devs)BLLog.log2File(TAG, autoConnect 共有USB数量${devs.size}, Uvc: ${cam?.productName})if (cam null) {BLLog.i(TAG, 未连接USB摄像头)} else {mUSBMonitor.requestPermission(cam)}}device_filter_uvc.xml
usbusb-device class239 subclass2 / !-- all device of UVC --
/usb如何判断该连接对象是UVC对象,如果名字中包含USBCam或 interfaceClass USB_CLASS_VIDEO private fun findUsbCam(devs: ListUsbDevice): UsbDevice? {for (dev in devs) {if (Build.VERSION.SDK_INT Build.VERSION_CODES.LOLLIPOP) {val name dev.productName dev.manufacturerNameBLLog.i(TAG, findUsbCam name:$name)if (name.contains(USBCam)) {return dev}for (i in 0 until dev.interfaceCount) {val inter dev.getInterface(i)BLLog.i(TAG, getInterface($i):$inter)if (inter.interfaceClass UsbConstants.USB_CLASS_VIDEO) {return dev}}}}return null}在onConnect中保存UvcCamera对象 override fun onConnect(device: UsbDevice?,ctrlBlock: USBMonitor.UsbControlBlock?,createNew: Boolean) {BLLog.i(TAG, onConnect ${device?.productName})synchronized(mSync) {try {// 保存最新的Uvc对象val camera UVCCamera();camera.open(ctrlBlock)BLLog.log2File(TAG,supportedSize: camera.supportedSize thread: Thread.currentThread().name)if (applyPreviewSize(camera)) {mUVCCamera?.destroy()mUVCCamera camerapreviewStatus PreViewStatus.None} else {BLLog.console(TAG, UVC不支持此分辨率$defPreviewSize)if (mUVCCamera null) {mUVCCamera camera}}uvcChangedSub.onNext(true)} catch (e:Exception){BLLog.log2File(TAG, onConnect Recv exception: $e)}}}预览并获取YUC视频帧 如果需要预览到UI中显示需要创建SurfaceView或者TextureView. mUVCCamera?.setPreviewDisplay(previewSurface)mUVCCamera?.startPreview()如果不需要预览到UI中显示可以new一个SurfaceTexture对象传进去即可必须要调用预览才能获取到YUV数据。 val surfaceTexture SurfaceTexture(0)mUVCCamera?.setPreviewTexture(surfaceTexture)BLLog.i(TAG, startPreviewWithAir)mUVCCamera?.startPreview()预览后获取YUV帧流 val width mUVCCamera?.previewSize?.width ?: defPreviewSize.widthval height mUVCCamera?.previewSize?.height ?: defPreviewSize.heightyuvCallback callbackmUVCCamera?.setFrameCallback({ buffer: ByteBuffer -
// BLLog.i(TAG, onFrame ${width}*${height})// yuv格式if (acceptFrame()) {val format MediaFormat.createVideoFormat(, width, height)val data ByteArray(buffer.remaining())buffer.get(data)val frame YuvFrameData(format, data, width, height)yuvCallback?.onGetYuvData(frame)}}, UVCCamera.PIXEL_FORMAT_NV21)获取到的YUV帧可以使用其他推流SDK进行推流即可比如使用阿里云推流SDK推流。 这完成可以在后台进行推流不需要UI上展示节省设备的性能。
连接类参考
// Uvc设备连接器
object UvcConnector : BaseBussModel(ModelType.Shared) {private val TAG UvcConnector::class.java.simpleNameprivate val KEY_UVC_PREVIEW_SIZE KEY_UVC_PREVIEW_SIZE// 默认支持640*480, 1920*1080private var defPreviewSize MySize.parseSize(1920*1080)!!enum class PreViewStatus {None,Visible,Air,}private lateinit var mUSBMonitor: USBMonitorVolatileprivate var mUVCCamera: UVCCamera? nullprivate val mSync Object()private var previewStatus PreViewStatus.NoneVolatileprivate var yuvCallback: IMediaKit.OnYuvListener? null// 状态变更消息private var uvcChangedSub PublishSubject.createBoolean()override fun onStartUp() {super.onStartUp()BLLog.i(TAG, onStartUp)val context BLSession.getApplicationContext()mUSBMonitor USBMonitor(context, mOnDeviceConnectListener)mUSBMonitor.register()CommonUtils.runAsync(::loadPreviewSize)}override fun onShutdown() {BLLog.i(TAG, onShutdown)mUSBMonitor.unregister()mUSBMonitor.destroy()super.onShutdown()}fun hasUvcDevice(): Boolean {return mUVCCamera ! null}fun previewStatus(): PreViewStatus {return previewStatus}fun getSubject() uvcChangedSubfun getNowSize(): MySize? {return mUVCCamera?.previewSize?.let {MySize(it.width, it.height)}}fun getExpSize(): MySize {return defPreviewSize}fun startPreview(previewSurface: Surface): CallResult {BLLog.i(TAG, startPreview)if (!hasUvcDevice()) {return CallResult(false, 未连接设备)}if (previewStatus PreViewStatus.Air) {mUVCCamera?.stopPreview()}if (!applyPreviewSize(mUVCCamera)) {BLLog.console(TAG, UVC不支持此分辨率$defPreviewSize)return CallResult(false, UVC不支持此分辨率$defPreviewSize)}mUVCCamera?.setPreviewDisplay(previewSurface)mUVCCamera?.startPreview()previewStatus PreViewStatus.Visibleif (yuvCallback ! null) {setYuvCallback(yuvCallback!!)}uvcChangedSub.onNext(true)return CallResult(true, 成功)}fun stopPreview() {BLLog.i(TAG, stopPreview)if (previewStatus ! PreViewStatus.Visible) {return}mUVCCamera?.stopPreview()previewStatus PreViewStatus.None// 需要接收数据if (yuvCallback ! null) {startPreviewWithAir()setYuvCallback(yuvCallback!!)}uvcChangedSub.onNext(true)}fun clearYuvCallback() {yuvCallback nullif (previewStatus PreViewStatus.Air) {mUVCCamera?.stopPreview()previewStatus PreViewStatus.NoneuvcChangedSub.onNext(true)}}fun setYuvCallback(callback: IMediaKit.OnYuvListener): Boolean {if (mUVCCamera null) {return false}if (previewStatus PreViewStatus.None) {startPreviewWithAir()}val width mUVCCamera?.previewSize?.width ?: defPreviewSize.widthval height mUVCCamera?.previewSize?.height ?: defPreviewSize.heightyuvCallback callbackmUVCCamera?.setFrameCallback({ buffer: ByteBuffer -
// BLLog.i(TAG, onFrame ${width}*${height})// yuv格式if (acceptFrame()) {val format MediaFormat.createVideoFormat(, width, height)val data ByteArray(buffer.remaining())buffer.get(data)val frame YuvFrameData(format, data, width, height)yuvCallback?.onGetYuvData(frame)}}, UVCCamera.PIXEL_FORMAT_NV21)return true}private fun acceptFrame(): Boolean {return Random.nextInt(30) 25}private fun startPreviewWithAir() {if (!applyPreviewSize(mUVCCamera)) {BLLog.console(TAG, UVC不支持此分辨率$defPreviewSize)return}val surfaceTexture SurfaceTexture(0)mUVCCamera?.setPreviewTexture(surfaceTexture)BLLog.i(TAG, startPreviewWithAir)mUVCCamera?.startPreview()previewStatus PreViewStatus.AiruvcChangedSub.onNext(true)}private fun findUsbCam(devs: ListUsbDevice): UsbDevice? {for (dev in devs) {if (Build.VERSION.SDK_INT Build.VERSION_CODES.LOLLIPOP) {val name dev.productName dev.manufacturerNameBLLog.i(TAG, findUsbCam name:$name)if (name.contains(USBCam)) {return dev}for (i in 0 until dev.interfaceCount) {val inter dev.getInterface(i)BLLog.i(TAG, getInterface($i):$inter)if (inter.interfaceClass UsbConstants.USB_CLASS_VIDEO) {return dev}}}}return null}private fun autoConnectUvcDevice() {val context BLSession.getApplicationContext()val filter: ListDeviceFilter DeviceFilter.getDeviceFilters(context, R.xml.device_filter_uvc)val devs: ListUsbDevice mUSBMonitor?.getDeviceList(filter[0]) ?: listOf()val cam findUsbCam(devs)BLLog.log2File(TAG, autoConnect 共有USB数量${devs.size}, Uvc: ${cam?.productName})if (cam null) {BLLog.i(TAG, 未连接USB摄像头)} else {mUSBMonitor.requestPermission(cam)}}private fun applyPreviewSize(camera: UVCCamera?):Boolean {if (camera null){return false}try {camera.setPreviewSize(defPreviewSize.width,defPreviewSize.height,UVCCamera.FRAME_FORMAT_MJPEG)} catch (e: IllegalArgumentException) {BLLog.log2File(TAG, setPreviewSize1 $defPreviewSize: $e)try {// fallback to YUV modecamera.setPreviewSize(defPreviewSize.width,defPreviewSize.height,UVCCamera.DEFAULT_PREVIEW_MODE)} catch (e1: IllegalArgumentException) {BLLog.log2File(TAG, setPreviewSize2 $defPreviewSize: $e1)return false}}return true}private val mOnDeviceConnectListener: USBMonitor.OnDeviceConnectListener object : USBMonitor.OnDeviceConnectListener {var connectJob: Disposable? nulloverride fun onAttach(device: UsbDevice?) {BLLog.i(TAG, onAttach)BLLog.toast(USB_DEVICE_ATTACHED)connectJob?.dispose()connectJob CommonUtils.runDelayed(1000) {autoConnectUvcDevice()}}override fun onDetach(device: UsbDevice?) {BLLog.i(TAG, onDetach)BLLog.toast(USB_DEVICE_DETACHED)synchronized(mSync) {if (mUVCCamera ! null) {mUVCCamera?.destroy()mUVCCamera nullpreviewStatus PreViewStatus.NoneuvcChangedSub.onNext(true)}}}override fun onConnect(device: UsbDevice?,ctrlBlock: USBMonitor.UsbControlBlock?,createNew: Boolean) {BLLog.i(TAG, onConnect ${device?.productName})synchronized(mSync) {try {// 保存最新的Uvc对象val camera UVCCamera();camera.open(ctrlBlock)BLLog.log2File(TAG,supportedSize: camera.supportedSize thread: Thread.currentThread().name)if (applyPreviewSize(camera)) {mUVCCamera?.destroy()mUVCCamera camerapreviewStatus PreViewStatus.None} else {BLLog.console(TAG, UVC不支持此分辨率$defPreviewSize)if (mUVCCamera null) {mUVCCamera camera}}uvcChangedSub.onNext(true)} catch (e:Exception){BLLog.log2File(TAG, onConnect Recv exception: $e)}}}override fun onDisconnect(device: UsbDevice?, ctrlBlock: USBMonitor.UsbControlBlock?) {BLLog.i(TAG, onDisconnect ${device?.productName})synchronized(mSync) {mUVCCamera?.destroy()mUVCCamera nullpreviewStatus PreViewStatus.NoneuvcChangedSub.onNext(true)}}override fun onCancel(device: UsbDevice?) {BLLog.i(TAG, onCancel)}}fun setPreviewSize(size: MySize) {defPreviewSize sizeSharedPreferenceHelper.saveCustom(KEY_UVC_PREVIEW_SIZE, size.toString())}private fun loadPreviewSize() {val str SharedPreferenceHelper.loadCustom(KEY_UVC_PREVIEW_SIZE, )defPreviewSize MySize.parseSize(str) ?: defPreviewSize}
}
