GB28181的应用场景非常广泛,如公共安全、交通管理、企业安全、教育、医疗等众多领域,细分场景可用于如执法记录仪、智能安全帽、智能监控、智慧零售、智慧教育、远程办公、明厨亮灶、智慧交通、智慧工地、雪亮工程、平安乡村、生产运输、车载终端等:
本文以Android平台GB28181设备接入模块为例,谈谈具体实现,还有如何对外输出RTSP流。
Android终端除支持常规的音视频数据接入外,还可以支持移动设备位置(MobilePosition)订阅和通知、语音广播和语音对讲、云台控制回调和预置位查询,支持对接数据类型如下:
技术设计架构图:
功能设计:
Android平台GB28181设备接入模块,除了上述的功能点外,我们遇到的诉求有,如何同时对外输出RTSP,供如内网平台预览播放?
这里就提到了轻量级RTSP服务,音视频数据源过来后,编码分别注入GB28181模块和轻量级RTSP服务模块,如果需要做到对外输出RTSP流,只需要启动RTSP服务,然后发布RTSP流即可,具体的操作如下:
启动、停止RTSP服务:
//启动/停止RTSP服务
class ButtonRtspServiceListener implements View.OnClickListener {
public void onClick(View v) {
if (isRTSPServiceRunning) {
stopRtspService();
btnRtspService.setText("启动RTSP服务");
btnRtspPublisher.setEnabled(false);
isRTSPServiceRunning = false;
return;
}
Log.i(TAG, "onClick start rtsp service..");
rtsp_handle_ = libPublisher.OpenRtspServer(0);
if (rtsp_handle_ == 0) {
Log.e(TAG, "创建rtsp server实例失败! 请联系 https://daniusdk.com 检查SDK有效性");
} else {
int port = 8554;
if (libPublisher.SetRtspServerPort(rtsp_handle_, port) != 0) {
libPublisher.CloseRtspServer(rtsp_handle_);
rtsp_handle_ = 0;
Log.e(TAG, "创建rtsp server端口失败! 请检查端口是否重复或者端口不在范围内!");
}
if (libPublisher.StartRtspServer(rtsp_handle_, 0) == 0) {
Log.i(TAG, "启动rtsp server 成功!");
} else {
libPublisher.CloseRtspServer(rtsp_handle_);
rtsp_handle_ = 0;
Log.e(TAG, "启动rtsp server失败! 请检查设置的端口是否被占用!");
}
btnRtspService.setText("停止RTSP服务");
btnRtspPublisher.setEnabled(true);
isRTSPServiceRunning = true;
}
}
}
发布、停止RTSP流:
//发布/停止RTSP流
class ButtonRtspPublisherListener implements View.OnClickListener {
public void onClick(View v) {
if (isRTSPPublisherRunning) {
stopRtspPublisher();
btnRtspPublisher.setText("发布RTSP流");
btnGetRtspSessionNumbers.setEnabled(false);
btnRtspService.setEnabled(true);
return;
}
Log.i(TAG, "onClick start rtsp publisher..");
if (!isPushingRtmp && !isGB28181StreamRunning && !isRecording) {
InitAndSetConfig();
}
if (publisherHandle == 0) {
Log.e(TAG, "Start rtsp publisher, publisherHandle is null..");
return;
}
String rtsp_stream_name = "stream1";
libPublisher.SetRtspStreamName(publisherHandle, rtsp_stream_name);
libPublisher.ClearRtspStreamServer(publisherHandle);
libPublisher.AddRtspStreamServer(publisherHandle, rtsp_handle_, 0);
if (libPublisher.StartRtspStream(publisherHandle, 0) != 0) {
Log.e(TAG, "调用发布rtsp流接口失败!");
return;
}
if (!isPushingRtmp && !isGB28181StreamRunning && !isRecording) {
CheckInitAudioRecorder(); //enable pure video publisher..
}
startLayerPostThread();
btnRtspPublisher.setText("停止RTSP流");
btnGetRtspSessionNumbers.setEnabled(true);
btnRtspService.setEnabled(false);
isRTSPPublisherRunning = true;
}
}
获取RTSP链接数:
//获取RTSP会话数
class ButtonGetRtspSessionNumbersListener implements View.OnClickListener {
public void onClick(View v) {
if (libPublisher != null && rtsp_handle_ != 0) {
int session_numbers = libPublisher.GetRtspServerClientSessionNumbers(rtsp_handle_);
Log.i(TAG, "GetRtspSessionNumbers: " + session_numbers);
PopRtspSessionNumberDialog(session_numbers);
}
}
}
获取回调上来的RTSP URL,对应的事件ID为EVENT_DANIULIVE_ERC_PUBLISHER_RTSP_URL:
private static class EventHandlerPublisherV2 implements NTSmartEventCallbackV2 {
@Override
public void onNTSmartEventCallbackV2(long handle, int id, long param1, long param2, String param3, String param4, Object param5) {
Log.i(TAG, "EventHandeV2: handle=" + handle + " id:" + id);
String publisher_event = "";
switch (id) {
.....
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_RECORDER_START_NEW_FILE:
publisher_event = "开始一个新的录像文件 : " + param3;
break;
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_ONE_RECORDER_FILE_FINISHED:
if (recorder_io_executor_ != null) {
ExecutorService executor = recorder_io_executor_.get();
if (executor != null)
executor.execute(new RecordFileFinishedHandler().set(handle, param3, param1));
}
publisher_event = "已生成一个录像文件 : " + param3;
break;
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_SEND_DELAY:
publisher_event = "发送时延: " + param1 + " 帧数:" + param2;
break;
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_CAPTURE_IMAGE:
publisher_event = "快照: " + param1 + " 路径:" + param3;
if (param1 == 0) {
publisher_event = publisher_event + "截取快照成功..";
} else {
publisher_event = publisher_event + "截取快照失败..";
}
break;
case NTSmartEventID.EVENT_DANIULIVE_ERC_PUBLISHER_RTSP_URL:
publisher_event = "RTSP服务URL: " + param3;
break;
}
String str = "当前回调状态:" + publisher_event;
Log.i(TAG, str);
if (handler_ != null) {
android.os.Handler handler = handler_.get();
if (handler != null) {
Message message = new Message();
message.what = PUBLISHER_EVENT_MSG;
message.obj = publisher_event;
handler.sendMessage(message);
}
}
}
public NTSmartEventCallbackV2 set(android.os.Handler handler, ExecutorService recorder_io_executor) {
this.handler_ = new WeakReference<>(handler);
this.recorder_io_executor_ = new WeakReference<>(recorder_io_executor);
return this;
}
private WeakReference handler_;
private WeakReference recorder_io_executor_;
}
GB28181设备接入模块同时输出RTSP流的话,需要注意的是,在一个实例里面完成,确保只编码一路音视频数据,然后分别打包注入两个模块,尽可能的降低设备性能消耗。