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deepch / RTSPtoWeb

RTSP Stream to WebBrowser
MIT License
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Do we have to return payload not found for offers with an audio section? #130

Open foxy82 opened 2 years ago

foxy82 commented 2 years ago

Hi,

Thanks ever so much for writing this.

I'm working on a proof of concept to display a generic rtsp webcam on an Alexa Echo Show as if it were a doorbell.

The Alexa offer has an audio component as the Echo Show allows audio between the Echo Show and the "Doorbell"

However if I pass that offer on directly to RTSPtoWeb I get back 

{ "status": 0, "payload": "payload type not found"}

Is there any way we can just return an answer without audio?

At the moment I'm stripping out the audio part before sending it on to RTSPtoWeb which is working (although only intermittently - I don't know if that is related or a different issue).

Example Alexa Offer:

v=0
o=- 3747690900 3747690900 IN IP4 0.0.0.0
s=a 2 z
c=IN IP4 0.0.0.0
t=0 0
a=group:BUNDLE audio0 video0
m=audio 1 RTP/SAVPF 96 0
a=candidate:1 1 UDP 2013266430 xxx.xxx.xxx.xxx 8620 typ host
a=candidate:2 1 TCP 1010827775 xxx.xxx.xxx.xxx 45351 typ host tcptype passive
a=candidate:3 2 UDP 2013266429 xxx.xxx.xxx.xxx 50066 typ host
a=candidate:4 2 TCP 1010827774 xxx.xxx.xxx.xxx 65157 typ host tcptype passive
a=candidate:5 2 TCP 1015022078 xxx.xxx.xxx.xxx 9 typ host tcptype active
a=candidate:6 1 TCP 1015022079 xxx.xxx.xxx.xxx 9 typ host tcptype active
a=setup:actpass
a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=rtpmap:96 opus/48000/2
a=rtcp:9 IN IP4 0.0.0.0
a=rtcp-mux
a=sendrecv
a=mid:audio0
a=ssrc:118039096 cname:user2571875795@host-433aaf59
a=ice-ufrag:AGVf
a=ice-pwd:h3JAYGhIaQ/Nvyaz9dLoz9
a=fingerprint:sha-256 34:D4:54:17:0C:95:2A:79:FF:72:10:21:E9:6E:F3:77:86:2F:8D:6C:33:45:BA:14:1D:43:01:D7:CD:0A:1A:84
m=video 1 RTP/SAVPF 99
a=candidate:4 1 UDP 2013266430 xxx.xxx.xxx.xxx 8620 typ host
a=candidate:5 1 TCP 1015022079 xxx.xxx.xxx.xxx 9 typ host tcptype active
a=candidate:4 2 UDP 2013266429 xxx.xxx.xxx.xxx 50066 typ host
a=candidate:6 1 TCP 1010827775 xxx.xxx.xxx.xxx 45351 typ host tcptype passive
a=candidate:5 2 TCP 1015022078 xxx.xxx.xxx.xxx 9 typ host tcptype active
a=candidate:6 2 TCP 1010827774 xxx.xxx.xxx.xxx 65157 typ host tcptype passive
b=AS:500
a=setup:actpass
a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=rtpmap:99 H264/90000
a=rtcp:9 IN IP4 0.0.0.0
a=rtcp-mux
a=sendrecv
a=mid:video0
a=rtcp-fb:99 nack
a=rtcp-fb:99 nack pli
a=rtcp-fb:99 ccm fir
a=ssrc:3643559644 cname:user2571875795@host-433aaf59
a=ice-ufrag:AGVf
a=ice-pwd:h3JAYGhIaQ/Nvyaz9dLoz9
a=fingerprint:sha-256 34:D4:54:17:0C:95:2A:79:FF:72:10:21:E9:6E:F3:77:86:2F:8D:6C:33:45:BA:14:1D:43:01:D7:CD:0A:1A:84

To get it to work I have to strip to remove audio0 from the group and all the audio section like so:

v=0
o=- 3747690900 3747690900 IN IP4 0.0.0.0
s=a 2 z
c=IN IP4 0.0.0.0
t=0 0
a=group:BUNDLE video0
m=video 1 RTP/SAVPF 99
a=candidate:4 1 UDP 2013266430 xxx.xxx.xxx.xxx 8620 typ host
a=candidate:5 1 TCP 1015022079 xxx.xxx.xxx.xxx 9 typ host tcptype active
a=candidate:4 2 UDP 2013266429 xxx.xxx.xxx.xxx 50066 typ host
a=candidate:6 1 TCP 1010827775 xxx.xxx.xxx.xxx 45351 typ host tcptype passive
a=candidate:5 2 TCP 1015022078 xxx.xxx.xxx.xxx 9 typ host tcptype active
a=candidate:6 2 TCP 1010827774 xxx.xxx.xxx.xxx 65157 typ host tcptype passive
b=AS:500
a=setup:actpass
a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=rtpmap:99 H264/90000
a=rtcp:9 IN IP4 0.0.0.0
a=rtcp-mux
a=sendrecv
a=mid:video0
a=rtcp-fb:99 nack
a=rtcp-fb:99 nack pli
a=rtcp-fb:99 ccm fir
a=ssrc:3643559644 cname:user2571875795@host-433aaf59
a=ice-ufrag:AGVf
a=ice-pwd:h3JAYGhIaQ/Nvyaz9dLoz9
a=fingerprint:sha-256 34:D4:54:17:0C:95:2A:79:FF:72:10:21:E9:6E:F3:77:86:2F:8D:6C:33:45:BA:14:1D:43:01:D7:CD:0A:1A:84
DevelopIdeas commented 2 years ago

Thanks @foxy82 I had the same issue with Alexa. For anyone else with the same issue, here's some code to strip the mentioned auto data from the sdp:

let sdpStr = event.directive.payload.offer.value
sdpStr = sdpStr.replace('a=group:BUNDLE audio0 video0', 'a=group:BUNDLE video0')
sdpStr = sdpStr.replace(/m=audio.*?a=fingerprint:sha-256.*?$/gsm, '')
sdpStr = sdpStr.replace(/\n{2,}/, '\n')+"\r\n"
const sdpOfferBase64 = Buffer.from(sdpStr, 'utf-8').toString('base64')

Everything is working perfectly inside Alexa now.