Android平台GB28181接入端语音广播和语音对讲规范解读和技术实现

标签：handle String GB28181 param int rtp 语音 receiver Android

我在之前的blog，有提到过Android端GB28181接入端的语音广播和语音对讲，今天主要从GB/T28181-2016官方规范和交互流程，大概介绍下Android平GB28181接入端的语音广播和语音对讲。

关于交互流程，本文不再赘述，一张图足矣：

Android平台GB28181接入端语音广播和语音对讲规范解读和技术实现_GB28181推流

接下来，我们主要来看看规范里面提到的协议接口。

语音广播通知、语音广播应答命令

消息头 Content-type字段为 Content-type:Application/MANSCDP+xml。

语音广播通知、语音广播应答命令采用 MANSCDP协议格式定义。

消息示例如下:

a) 语音广播通知

MESSAGE sip:[email protected]:5511SIP/2.0
From: <sip:31010400002000000001 @ 3101040000>;tag = b05e7e60-ca00a8c0-1587-3a3-7fb52a44-3a3
To:<sip:[email protected]:5511>
Call-ID:b05e7e60-ca00a8c0-1587-3a3-2b297f29-3a3@3101040000
CSeq:1761796551 MESSAGE
Via:SIP/2.0/UDP192.168.0.202:5511;rport;branch=z9hG4bK-3a3-e3849-287ef646
Max-Forwards:70
Content-Type:application/MANSCDP+xml
Content-Length:159
<? xmlversion="1.0" ?>
<Notify>
<CmdType>Broadcast</CmdType>
<SN>992</SN>
<SourceID>31010400001360000001</SourceID>
<TargetID>31010403001370002272</TargetID>
</Notify>

b) 语音广播应答

MESSAGEsip:31010400002000000001@3101040000SIP/2.0
From:<sip:31010403001370002272@3101040300>;tag=b55b4cf8-c700a8c0-1587-a3-1ba9ac5-a3
To:<sip:31010400002000000000@3101040000>
Call-ID:b55b4cf8-c700a8c0-1587-a3-5eacf182-a3@3101040300
CSeq:1856483244 MESSAGE
Via:SIP/2.0/UDP192.168.0.199:5511;rport;branch=z9hG4bK-a3-27e0b-71dd2b33
Max-Forwards:70
Content-Type:application/MANSCDP+xml

<? xmlversion="1.0" ?>
<Response>
<CmdType>Broadcast</CmdType>
<SN>992</SN>
<DeviceID>31010403001370002272</DeviceID>
<Result>OK</Result>
</Response>

涉及到的SDP相关参数：

v=0
o=6401060000202000000100INIP4172.20.16.3
s=Play
c=INIP4172.20.16.3
t=00
m=audio8000RTP/AVP8 //标识语音媒体流内容
a=sendonly
a=rtpmap:8PCMA/8000 //RTP+音频流
y=0100000001
f=v/////a/1/8/1 //音频参数描述

技术实现

本文以大牛直播SDK的Android平台基于Camera2的采集demo为例，如果需要注册到GB28181平台，点击页面的“启动GB28181”即可，有语音广播过来后，使能“GB28181语音广播”按钮，用于主动关闭语音广播之用。

Android平台GB28181接入端语音广播和语音对讲规范解读和技术实现_GB28181 broadcast_02

语音广播信令Listener如下：

package com.gb28181.ntsignalling;

public interface GBSIPAgentListener
{
    /*
    *收到语音广播通知
     */
    void ntsOnNotifyBroadcastCommand(String fromUserName, String fromUserNameAtDomain, String sn, String sourceID, String targetID);

    /*
    *需要准备接受语音广播的SDP内容
     */
    void ntsOnAudioBroadcast(String commandFromUserName, String commandFromUserNameAtDomain, String sourceID, String targetID);

    /*
    *音频广播, 发送Invite请求异常
     */
    void ntsOnInviteAudioBroadcastException(String sourceID, String targetID, String errorInfo);

    /*
    *音频广播, 等待Invite响应超时
     */
    void ntsOnInviteAudioBroadcastTimeout(String sourceID, String targetID);

    /*
    *音频广播, 收到Invite消息最终响应
     */
    void ntsOnInviteAudioBroadcastResponse(String sourceID, String targetID, int;

    /*
     * 音频广播, 收到BYE Message
     */
    void ntsOnByeAudioBroadcast(String sourceID, String targetID);

    /*
    * 不是在收到BYE Message情况下， 终止音频广播
     */
    void ntsOnTerminateAudioBroadcast(String sourceID, String targetID);
}

相关信令接口如下：

package com.gb28181.ntsignalling;

public interface GBSIPAgent {

    /*
     *语音广播应答
     */
    void respondBroadcastCommand(String fromUserName, String fromUserNameAtDomain, String sn, String sourceID, String targetID, boolean;

    /*
    *语音广播接收者发送Invite消息, rtp ssrc暂时由sdk生成
    *@param addressType: ipv4:"IP4", ipv6:"IP6", 其他不支持, 填充SDP用
    *@param localAddress: 本地IP地址, 填充SDP用
    *@param localPort: 本地端口, 填充SDP用
    *@param mediaTransportProtocol: 媒体传输协议, rtp over udp:"RTP/AVP", rtp over tcp:"TCP/RTP/AVP". 其他不支持, 填充SDP用
     */
    boolean inviteAudioBroadcast(String commandFromUserName, String commandFromUserNameAtDomain, String sourceID, String targetID,
                                 String addressType, String localAddress, int;

    /*
    *取消音频广播, 这个需要在invite收到临时响应之后，最终响应之前才能成功, 如果UAS已经发送过最终响应, UAS收到cancel不做处理, 具体参考RFC3261
     */
    boolean cancelAudioBroadcast(String sourceID, String targetID);

    /*
    *终止语音广播会话, 发送BYE消息
     */
    boolean byeAudioBroadcast(String sourceID, String targetID);
}

接下来就是收到RTP音频包和解码输出这块，我们直接在播放端做扩展即可，设计如下：

  /*
 * SmartPlayerJniV2.java
 * SmartPlayerJniV2
 *
 * WebSite: https://daniusdk.com
 */
  /*++++++++++++++++++RTP Receiver++++++++++++++++++++++*/

  /*
   * 创建RTP Receiver
   *
   * @param reserve：保留参数传0
   *
   * @return RTP Receiver 句柄，0表示失败
   */
  public native long CreateRTPReceiver(int reserve);


  /**
   *设置 RTP Receiver传输协议
   *
   * @param rtp_receiver_handle, CreateRTPReceiver
   * @param transport_protocol, 0:UDP, 1:TCP, 默认是UDP
   *
   * @return {0} if successful
   */
  public native int SetRTPReceiverTransportProtocol(long rtp_receiver_handle, int transport_protocol);


  /**
   *设置 RTP Receiver IP地址类型
   *
   * @param rtp_receiver_handle, CreateRTPReceiver
   * @param ip_address_type, 0:IPV4, 1:IPV6, 默认是IPV4
   *
   * @return {0} if successful
   */
  public native int SetRTPReceiverIPAddressType(long rtp_receiver_handle, int ip_address_type);


  /**
   *设置 RTP Receiver RTP Socket本地端口
   *
   * @param rtp_receiver_handle, CreateRTPReceiver
   * @param port, 必须是偶数，设置0的话SDK会自动分配, 默认值是0
   *
   * @return {0} if successful
   */
  public native int SetRTPReceiverLocalPort(long rtp_receiver_handle, int port);


  /**
   *设置 RTP Receiver SSRC
   *
   * @param rtp_receiver_handle, CreateRTPReceiver
   * @param ssrc, 如果设置的话，这个字符串要能转换成uint32类型, 否则设置失败
   *
   * @return {0} if successful
   */
  public native int SetRTPReceiverSSRC(long rtp_receiver_handle, String ssrc);


  /**
   *创建 RTP Receiver 会话
   *
   * @param rtp_receiver_handle, CreateRTPReceiver
   * @param reserve, 保留值，目前传0
   *
   * @return {0} if successful
   */
  public native int CreateRTPReceiverSession(long rtp_receiver_handle, int reserve);


  /**
   *获取 RTP Receiver RTP Socket本地端口
   *
   * @param rtp_receiver_handle, CreateRTPReceiver
   *
   * @return 失败返回0, 成功的话返回响应的端口, 请在CreateRTPReceiverSession返回成功之后调用
   */
  public native int GetRTPReceiverLocalPort(long rtp_receiver_handle);


  /**
   *设置 RTP Receiver Payload 相关信息
   *
   * @param rtp_receiver_handle, CreateRTPReceiver
   *
   * @param payload_type, 请参考 RFC 3551
   *
   * @param encoding_name, 编码名, 请参考 RFC 3551, 如果payload_type不是动态的, 可能传null就好
   *
   * @param media_type, 媒体类型, 请参考 RFC 3551, 1 是视频, 2是音频
   *
   * @param clock_rate, 请参考 RFC 3551
   *
   * @return {0} if successful
   */
  public native int SetRTPReceiverPayloadType(long rtp_receiver_handle, int payload_type, String encoding_name, int media_type, int clock_rate);


  /**
   *设置 RTP Receiver 音频采样率
   *
   * @param rtp_receiver_handle, CreateRTPReceiver
   * @param sampling_rate, 音频采样率
   *
   * @return {0} if successful
   */
  public native int SetRTPReceiverAudioSamplingRate(long rtp_receiver_handle, int sampling_rate);

  /**
   *设置 RTP Receiver 音频通道数
   *
   * @param rtp_receiver_handle, CreateRTPReceiver
   * @param channels, 音频通道数
   *
   * @return {0} if successful
   */
  public native int SetRTPReceiverAudioChannels(long rtp_receiver_handle, int channels);


  /**
   *设置 RTP Receiver 远端地址
   *
   * @param rtp_receiver_handle, CreateRTPReceiver
   * @param address, IP地址
   * @param port, 端口
   *
   * @return {0} if successful
   */
  public native int SetRTPReceiverRemoteAddress(long rtp_receiver_handle, String address, int port);

  /**
   *初始化 RTP Receiver
   *
   * @param rtp_receiver_handle, CreateRTPReceiver
   *
   * @return {0} if successful
   */
  public native int InitRTPReceiver(long rtp_receiver_handle);

  /**
   *UnInit RTP Receiver
   *
   * @param rtp_receiver_handle, CreateRTPReceiver
   *
   * @return {0} if successful
   */
  public native int UnInitRTPReceiver(long rtp_receiver_handle);


  /**
   *Destory RTP Receiver Session
   *
   * @param rtp_receiver_handle, CreateRTPReceiver
   *
   * @return {0} if successful
   */
  public native int DestoryRTPReceiverSession(long rtp_receiver_handle);


  /**
   *Destory RTP Receiver
   *
   * @param rtp_receiver_handle, CreateRTPReceiver
   *
   * @return {0} if successful
   */
  public native int DestoryRTPReceiver(long rtp_receiver_handle);


  /*++++++++++++++++++RTP Receiver++++++++++++++++++++++*/

以上是GB/T28181-2016规范关于语音广播和语音对讲的部分说明和Android端GB28181接入端针对语音广播的技术实现，感兴趣的开发者可酌情参考。

标签：handle,String,GB28181,param,int,rtp,语音,receiver,Android
From： https://blog.51cto.com/daniusdk/5760538

Android平台GB28181接入端语音广播和语音对讲规范解读和技术实现

语音广播通知、语音广播应答命令

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