定位录像时间的rtsp消息

定位录像时间的rtsp消息

编者：李国帅

qq：9611153 微信lgs9611153

时间：2012/03/14

背景原因:

使用rtsp至今依然是重要的媒体播放方式，这里回顾一下，录像定位方法。

 

定位消息play：

 

我们使用rtsp的play消息定位录像的位置，例如

PLAY rtsp://192.168.10.108:554/h264/ch1/main/av_stream RTSP/1.0

Authorization: Basic YWRtaW46MTIzNDU=

CSeq: 6

Session:       1528544584

Range: npt=0.0-

x-prebuffer: maxtime=0.0

User-agent: RtspClient

---------

RTSP/1.0 200 OK

CSeq: 6

Session:       1528544584

Range: npt=now-

RTP-Info: url=trackID=1;seq=17915,url=trackID=2;seq=57620

-------------------------------------------------------------------

在describe中查询录像长度和时间

RTSP/1.0 200 OK

Server: DSS/1.0.5 (Build/6; Platform/Linux; Release/Darwin Streaming Server; State/Development; )

Cseq: 3

Last-Modified: Tue, 08 May 2012 08:16:40 GMT

Cache-Control: must-revalidate

Content-length: 396

Date: Thu, 10 May 2012 03:15:59 GMT

Expires: Thu, 10 May 2012 03:15:59 GMT

Content-Type: application/sdp

x-Accept-Retransmit: our-retransmit

x-Accept-Dynamic-Rate: 1

Content-Base: rtsp://192.168.10.35:554/video1/

 

v=0

o=StreamingServer 3331435948 1116907222000 IN IP4 192.168.10.109

s=h264.mp4

c=IN IP4 0.0.0.0

t=0 0

a=starttime: 20120424181818

a=range:npt=0.00000-698.40000

a=control:*

m=video 0 RTP/AVP 96

a=3GPP-Adaptation-Support:1

a=control:trackID=0

a=rtpmap:96 H264/90000

a=fmtp:96 profile-level-id=42801E;sprop-parameter-sets=Njc0MmUwMTRkYTA1ODI1MQ==,NjhjZTMwYTQ4MA==;packetization-mode=1

 

可以分析出配置。

static const char*    sRangeNpt                = "a=range:npt=";

static const char*    sStartTime                 = "a=starttime: ";

------------

播放和暂停消息

PLAY rtsp://192.168.10.35:554/video1/ RTSP/1.0

CSeq: 5

User-Agent: LibVLC/2.0.1 (LIVE555 Streaming Media v2011.12.23)

Session: 7705749015246682008

Range: npt=0.000-

 

RTSP/1.0 200 OK

Server: DSS/1.0.5 (Build/6; Platform/Linux; Release/Darwin Streaming Server; State/Development; )

Cseq: 5

Session: 7705749015246682008

Range: npt=0.00000-698.40000

RTP-Info: url=rtsp://192.168.10.35:554/video1/trackID=0;seq=15619;rtptime=1911497317

 

PAUSE rtsp://192.168.10.35:554/video1/ RTSP/1.0

CSeq: 6

User-Agent: LibVLC/2.0.1 (LIVE555 Streaming Media v2011.12.23)

Session: 7705749015246682008

 

RTSP/1.0 200 OK

Server: DSS/1.0.5 (Build/6; Platform/Linux; Release/Darwin Streaming Server; State/Development; )

Cseq: 6

Session: 7705749015246682008

 

PLAY rtsp://192.168.10.35:554/video1/ RTSP/1.0

CSeq: 7

User-Agent: LibVLC/2.0.1 (LIVE555 Streaming Media v2011.12.23)

Session: 7705749015246682008

Range: npt=396.691-

 

RTSP/1.0 200 OK

Server: DSS/1.0.5 (Build/6; Platform/Linux; Release/Darwin Streaming Server; State/Development; )

Cseq: 7

Session: 7705749015246682008

Range: npt=396.69100-698.40000

RTP-Info: url=rtsp://192.168.10.35:554/video1/trackID=0;seq=17212;rtptime=1912838828

 

PLAY rtsp://192.168.10.35:554/video1/ RTSP/1.0

CSeq: 6

User-Agent: LibVLC/2.0.1 (LIVE555 Streaming Media v2011.12.23)

Session: 7705749015912989047

Scale: 1.100110

 

RTSP/1.0 200 OK

Server: DSS/1.0.5 (Build/6; Platform/Linux; Release/Darwin Streaming Server; State/Development; )

Cseq: 6

Session: 7705749015912989047

Speed:    1.10011

Range: npt=22.16000-698.40000

RTP-Info: url=rtsp://192.168.10.35:554/video1/trackID=0;seq=20973;rtptime=1294004159

 

PLAY rtsp://192.168.10.35:554/video1/ RTSP/1.0

CSeq: 10

User-Agent: LibVLC/2.0.1 (LIVE555 Streaming Media v2011.12.23)

Session: 7705749015912989047

Scale: 0.900090

 

RTSP/1.0 200 OK

Server: DSS/1.0.5 (Build/6; Platform/Linux; Release/Darwin Streaming Server; State/Development; )

Cseq: 10

Session: 7705749015912989047

Speed:    0.90009

Range: npt=97.16000-698.40000

RTP-Info: url=rtsp://192.168.10.35:554/video1/trackID=0;seq=32044;rtptime=1292160624