1.概述

主要功能是调过live555 testRTSPClient 简单封装的rtsp客户端库，拉取RTSP流，然后调过3403的VDEC模块进行解码，送个NPU进行目标检测，输出到hdmi，这样保证了开发没有sensor的时候可以识别其它摄像头的视频流；

2.如何搭建一个RTSPServer

2.1使用live555 mediaServer搭建rtspServer

#这里可以去http://live555.com/官网查看
wget http://live555.com/liveMedia/public/live.2024.10.31.tar.gz
tar xvzf live.2024.10.31.tar.gz
cd live
./genMakefiles linux-no-std-lib
make -j
cd mediaServer
./live555MediaServer

执行的效果如下，默认支持的文件list如下，只需要把对应类型的文件复制到mediaServer目录即可，可以用vlc测试是否正常

LIVE555 Media Server
	version 1.13 (LIVE555 Streaming Media library version 2024.10.31).
Play streams from this server using the URL
	rtsp://192.168.8.8:8554/<filename>
where <filename> is a file present in the current directory.
Each file's type is inferred from its name suffix:
	".264" => a H.264 Video Elementary Stream file
	".265" => a H.265 Video Elementary Stream file
	".aac" => an AAC Audio (ADTS format) file
	".ac3" => an AC-3 Audio file
	".amr" => an AMR Audio file
	".dv" => a DV Video file
	".m4e" => a MPEG-4 Video Elementary Stream file
	".mkv" => a Matroska audio+video+(optional)subtitles file
	".mp3" => a MPEG-1 or 2 Audio file
	".mpg" => a MPEG-1 or 2 Program Stream (audio+video) file
	".ogg" or ".ogv" or ".opus" => an Ogg audio and/or video file
	".ts" => a MPEG Transport Stream file
		(a ".tsx" index file - if present - provides server 'trick play' support)
	".vob" => a VOB (MPEG-2 video with AC-3 audio) file
	".wav" => a WAV Audio file
	".webm" => a WebM audio(Vorbis)+video(VP8) file
See http://www.live555.com/mediaServer/ for additional documentation.
(We use port 8000 for optional RTSP-over-HTTP tunneling).)

2.2 ffmpeg转264文件

如果是mp4文件可以用ffmpeg简单的提取264文件，命令如下

#sudo apt-get install ffmpeg
ffmpeg -i input.mp4 -an -codec:v copy output.264

3.封装RtspClinet

代码参考live/testProgs/testRTSPClient.cpp
需要注意Nal头即可，不同RtspServer会有不同的发包方式

void DummySink::afterGettingFrame(unsigned frameSize,
                                  unsigned numTruncatedBytes,
                                  struct timeval presentationTime,
                                  unsigned /*durationInMicroseconds*/)
	{
	//frameSize 这个是一帧图像
	//  u_int8_t *fReceiveBuffer;这个是frame数据内容
	//struct timeval presentationTime,这个是当前frame的pts
	}

完整代码参考开源仓库下面目录

//thridpart/live555/librtspclient.h
RTSPCLI_API int MyRTSP_Init(RTSP_Handle** handle);/*句柄  返回0表示成功，返回非0表示失败 */
RTSPCLI_API int MyRTSP_Deinit(RTSP_Handle* handle);/* 释放RTSPClient 参数为RTSPClient句柄 */
RTSPCLI_API int MyRTSP_OpenStream(RTSP_Handle* handle, const char* _url, EASY_RTP_CONNECT_TYPE _connType,int _reconn/*1000表示长连接,即如果网络断开自动重连, 其它值为连接次数*/);/* 打开网络流 */
RTSPCLI_API int MyRTSP_SetCallback(RTSP_Handle* handle,RTSPSourceCallBack _callback, void* userptr);/* 设置数据回调 */
RTSPCLI_API int MyRTSP_Run(RTSP_Handle* handle);
RTSPCLI_API int MyRTSP_CloseStream(RTSP_Handle* handle);/* 关闭网络流 */

4.整合数据给VDEC

#include "librtspclient.h"
RTSP_Handle* hRTSPHandle_;
int RtspRunnig_ = 0;
pthread_t rtsp_thd_;
void *pRtspFrame = NULL;
static char sps[32];
static char pps[32];
static int spslen = 0;
static int ppslen = 0;
static int initvpss = 0;
static int RTSPSourceCall(EASY_FRAME_INFO_T frameinfo, void* userdata)
{
    // printf("frameinfo.framesize:%d,bIFrame:%d:NaluType:%d\n", frameinfo.framesize, frameinfo.bIFrame, frameinfo.NaluType);
    //这里做了简单是数据拼接，主要是为了给VDEC 完整的264帧，有问题可以调试下这部分数据，需要有nal头00 00 00 01 +xxx
    //I帧 nal+sps + nal+pps +nal +iframe
    //p帧 nal + pframe
    if (frameinfo.NaluType == 0x07)
    {
        memcpy(sps, frameinfo.framebuff, frameinfo.framesize);
        spslen = frameinfo.framesize;
        return 0;
    }
    else if (frameinfo.NaluType == 0x08)
    {
        memcpy(pps, frameinfo.framebuff, frameinfo.framesize);
        ppslen = frameinfo.framesize;
        return 0;
    }
    uint32_t len = 0;
    if (frameinfo.bIFrame)
    {
        memcpy(pRtspFrame, sps, spslen);
        len += spslen;
        memcpy(pRtspFrame + len, pps, ppslen);
        len += ppslen;
        memcpy(pRtspFrame + len, frameinfo.framebuff, frameinfo.framesize);
        len += frameinfo.framesize;
    }
    else
    {
        memcpy(pRtspFrame + len, frameinfo.framebuff, frameinfo.framesize);
        len += frameinfo.framesize;
    }

    ot_vdec_stream stream;
    ot_vdec_chn vdecchn = 0;
    td_s32 milli_sec = 40;
    ot_vpss_grp grp = 0;
    ss_mpi_sys_get_cur_pts(&stream.pts);
    stream.addr = pRtspFrame;
    stream.len = len;
    stream.end_of_frame = TD_TRUE;
    stream.end_of_stream = TD_FALSE;
    stream.need_display = TD_TRUE;

    ss_mpi_vdec_send_stream(vdecchn, &stream, -1);
    ot_video_frame_info frame_info;
    ot_vdec_supplement_info supplement;
    ss_mpi_vdec_get_frame(vdecchn, &frame_info, &supplement, milli_sec);
    if (initvpss == 0 && frame_info.video_frame.width > 0)
    {
    	//第一帧解析成功才创建vpss通道
        ot_size in_size;
        in_size.width = frame_info.video_frame.width;
        in_size.height = frame_info.video_frame.height;
        printf("vpss init W: H:%d\n", in_size.width, in_size.height);
        sample_vio_start_vpss(grp, &in_size);
        initvpss = 1;
    }
    ss_mpi_vpss_send_frame(grp, &frame_info, milli_sec);
    ss_mpi_vdec_release_frame(vdecchn, &frame_info);

    return 0;
}
void* RtspProcess(void* args) {
    while (RtspRunnig_) {
        MyRTSP_Run(hRTSPHandle_);
    }
    printf("Rtsp thread Finish\n");
    return NULL;
}
void RtspStart(const char* url)
{
    pRtspFrame = malloc(1024*1024);
    RtspRunnig_ = 1;
    MyRTSP_Init(&hRTSPHandle_);
    MyRTSP_SetCallback(hRTSPHandle_, RTSPSourceCall, NULL);
    MyRTSP_OpenStream(hRTSPHandle_, url, EASY_RTP_OVER_TCP, 0);
    pthread_create(&rtsp_thd_, 0, RtspProcess, NULL);
}
void RtspStop()
{
    RtspRunnig_ = 0;
    MyRTSP_Deinit(hRTSPHandle_);
    pthread_join(rtsp_thd_, NULL);
    free(pRtspFrame);
    pRtspFrame = NULL;
}

5.完整Demo

后端处理的pipleline参考，直接把vdec流送给vpss，后面npu的部分在以前yolov8_deepsort_mp4分支中查看即可

6.工程代码

6.1代码仓库地址

giee仓库地址

6.2下载编译代码

git clone -b yolov8_deepsort_rtsp --depth=1 --single-branch https://gitee.com/apchy_ll/ss928_yolov5s.git
cd ss928_yolov5s
./build.sh
cp -rf output ~/work/nfs/3403/

6.3板端运行

./rundemo.sh rtsp://192.168.8.8:8554/output.264 

7.教学视频

8.谢谢

请多多支持！