概述

libyangpeerconnection7是一个实现P2P媒体传输/数据通道的一个轻量级的webRTC库，基于metaRTC7.0的传输模块构建，支持H264/H265视频编码，通过 P2P 连接为用户提供高效、低延迟的音视频和数据通信。

君正版libyangpeerconnection7可适用于t31/x2000等多个君正SOC系列，助力基于君正webRTC P2P应用快速开发。

下载

https://download.csdn.net/download/m0_56595685/90910661

依赖文件

• 头文件：YangPeerConnection7.h
• 库文件：libyangpeerconnection7.so

示例代码

对象分配与释放

YangPeerConnection7* peer = (YangPeerConnection7*)calloc(1, sizeof(YangPeerConnection7));

YangPeerInfo* peerInfo=&peer->peer.peerInfo;
yang_init_peerParam(peerInfo);

peerInfo->uid = uid;
peerInfo->userId=userId;
peerInfo->direction = YangSendonly;
peerInfo->rtc.rtcLocalPort = 16000;
peerInfo->rtc.isControlled = yangtrue;
peerInfo->rtc.iceCandidateType = 2;

peerInfo->pushAudio.sample = 8000;
peerInfo->pushAudio.channel = 1;
peerInfo->pushAudio.audioEncoderType = Yang_AED_PCMA;

peerInfo->pushVideo.width = 1280;
peerInfo->pushVideo.height = 720;
peerInfo->pushVideo.fps = 30;
peerInfo->pushVideo.videoEncoderType = Yang_VED_H264;

peerInfo->rtc.iceServerPort=3478;
strcpy(peerInfo->rtc.iceServerIP, "192.168.0.104");
strcpy(peerInfo->rtc.iceUserName, "metartc");
strcpy(peerInfo->rtc.icePassword, "metartc");

peer->peer.peerCallback.sslCallback.context = session;
peer->peer.peerCallback.sslCallback.sslAlert = ipc_rtcrecv_sslAlert;
peer->peer.peerCallback.recvCallback.context = session;

peer->peer.peerCallback.recvCallback.receiveAudio = ipc_rtcrecv_receiveAudio;
peer->peer.peerCallback.recvCallback.receiveVideo = ipc_rtcrecv_receiveVideo;
peer->peer.peerCallback.recvCallback.receiveMsg = ipc_rtcrecv_receiveMsg;

peer->peer.peerCallback.iceCallback.context = session;
peer->peer.peerCallback.iceCallback.onConnectionStateChange=ipc_onConnectionStateChange;
peer->peer.peerCallback.iceCallback.onIceStateChange=ipc_onIceStateChange;
peer->peer.peerCallback.iceCallback.onIceCandidate=ipc_onIceCandidate;

yang_create_peerConnection7(peer);

peer->addAudioTrack(&peer->peer,Yang_AED_PCMA);
peer->addVideoTrack(&peer->peer,Yang_VED_H264);
peer->addTransceiver(&peer->peer,YangMediaAudio,peer->peer.peerInfo.direction);
peer->addTransceiver(&peer->peer,YangMediaVideo,peer->peer.peerInfo.direction);

//通过信令取得对端sdp

if((ret = peer->setRemoteDescription(&peer->peer, sdp))!=Yang_Ok){
goto cleanup;
}

//取得answer通过信令传回对端
if((ret = peer->createAnswer(&peer->peer, answer))!=Yang_Ok){
goto cleanup;
}

//free peer
if(peer){
    yang_destroy_peerConnection7(peer);
    free(peer);
}

交换ICE Candidate

//通过信令取得对端candidate
peer->addIceCandidate(&peer->peer,candidate);
//回调函数
static void ipc_onIceCandidate(void* context, int32_t uid,char* candidateStr){
    if (context == NULL) return;
    //取得candidate 通过信令传到对端
}

回调函数

static void ipc_onConnectionStateChange(void* context, int32_t uid,YangRtcConnectionState connectionState){

if (context == NULL) return;

switch(connectionState){
case Yang_Conn_State_Connecting:{
break;
}
case Yang_Conn_State_Connected:{
break;
}
case Yang_Conn_State_Disconnected:{
break;
}
case Yang_Conn_State_Failed:{
//yang_trace("\nYang_Conn_State_Failed remove uid==%d",uid);
//removePeer(uid);
break;
}
case Yang_Conn_State_Closed:{
break;
}
default:break;
}
}

static void ipc_onIceStateChange(void* context,int32_t uid,YangIceCandidateState iceState){

if (context == NULL) return;
switch(iceState){
case YangIceSuccess:{
break;
}
case YangIceFail:{
//yang_trace("\nYangIceFail remove uid==%d",uid);
break;
}
default:break;
}
}

static void ipc_onIceCandidate(void* context, int32_t uid,char* sdp){
    if (context == NULL) return;
    //取得candidate 传到对端
}

static void ipc_rtcrecv_sslAlert(void *context, int32_t uid, char *type, char *desc) {
    if (context == NULL || type == NULL || desc == NULL)
        return;
    if (yang_strcmp(type, "warning") == 0 && yang_strcmp(desc, "CN") == 0) {
       // removePeer( uid);
    }
}

static void ipc_rtcrecv_receiveAudio(void *user, YangFrame *audioFrame) {
    if (user == NULL || audioFrame == NULL)
    return;
}

static void ipc_rtcrecv_receiveVideo(void *user, YangFrame *videoFrame) {
    if (user == NULL || videoFrame == NULL)
    return;
}

static void ipc_rtcrecv_receiveMsg(void *user, YangFrame *msgFrame) {
    if (user == NULL) return;
  //  receiveMsg(msgFrame->uid,msgFrame->payload,msgFrame->nb);
}

推流

//YangFrame payload 数据 nb:数据长度
//frametype:YANG_Frametype_I(I帧) YANG_Frametype_P(P帧或B帧)
//I帧 四字节sps长度+sps+四字节pps长度+pps+(00,00,00,01)+I帧 如：00,00,00,0e,67,42,c0,1f,8c,8d,40,50,1e,d0,0f,08,84,6a,00,00,00,04,68,ce,3c,80,00,00,00,01,65,b8,00,04,00,00,13,88,c5
//P帧或B帧 如：00,00,00,01,61,e0,00,40,00,be,41,38,22,93,df
//去掉start code 00,00,00,01,取61,e0,00,40,00,be,41,38,22,93,df
rtc->on_video(&rtc->peer, videoFrame)://推视频
rtc->on_audio(&rtc->peer, audioFrame);//推音频