Support for SRT Listener mode and SRT Playback?

[noho501]

Hi,

I’m currently exploring SRT usage on Android and have a couple of questions:

1. Listener mode – Does the library support acting as an SRT Listener?
2. Playback/Receiving – Is there support for receiving and playing an SRT stream?

Any guidance or examples would be greatly appreciated.

Thank you!

[noho501]

Hi @pedroSG94 ,

Could you please take a look at this?
I'm trying to start SRT in listener mode, but it’s not working. I’m not sure whether I’m doing something wrong or if the library simply doesn’t support SRT in listener mode.

Here is the code:

private var srtUrl: String = "srt://192.168.1.8:9991?latency=100&mode=listener"

try {
    genericStream.startStream(srtUrl)
} catch (ex: Exception) {
    Log.e(TAG, "startStream: Exception during startStream with endpoint: ${getMainServer()}", ex)
    Toast.makeText(
        baseContext,
        baseContext.getString(com.nabiapp.overlay.R.string.error_start_stream),
        Toast.LENGTH_SHORT
    ).show()
}

And this is the error:

connection error
kotlinx.coroutines.channels.ClosedReceiveChannelException: Channel was closed
    at kotlinx.coroutines.channels.BufferedChannel.getReceiveException(BufferedChannel.kt:1762)
    at kotlinx.coroutines.channels.BufferedChannel.resumeWaiterOnClosedChannel(BufferedChannel.kt:2204)

Thanks

[pedroSG94]

Hello,

This library can't do it. Only push is supported.
You can try check this project that use exoplayer:
https://github.com/ThibaultBee/AndroidSrtPlayer

[noho501]

I understand that AndroidSrtPlayer only supports the player mode. Does this mean that SRT listener mode (acting as a server) is not supported on Android?

On iOS, HaishinKit allows both caller (push) and listener (receive/server) modes, which makes it easy to stream video/audio from phone A to phone B over a LAN. Is there any recommended way or library to achieve the same on Android, or is it generally difficult to implement?

[pedroSG94]

Hello,

Currently it is not supported and I don't know a library to do it.
I recommend you migrate to webRTC if you want do video calls because SRT is not designed for it.
webRTC can be used in all platforms and is specially designed for it. It is the library used by apps like Google Meet or Discord

[noho501]

Hi @pedroSG94

If we would like to develop this feature—specifically, adding SRT listener mode support—would you be open to implementing it? We are willing to pay for the development of this feature if needed.

Our intention is to send video from Android to Android via SRT. On Google Play, apps like Larix Broadcaster already support this use case, and we hope this framework could support it as well.

Please let us know if this is something you would be interested in discussing further. Thank you very much for your time and consideration.

[pedroSG94]

Hello,

Yes, I'm interested but first I think that I want to finish WHIP support.
This feature need to create an mpeg-ts demuxer and create a class to properly decode the video/audio received. It is a big feature.

[noho501]

Thank you

If we approach it this way, would it be easier to implement?

RootEncoder is capable of opening SRT ports and sending video by acting as the sender (listening side), for example:

ffmpeg -re -i local.mp4 \
-c copy -f mpegts \
"srt://IP_VIEWER:9992?mode=caller&latency=30"

In this setup, would another phone be able to connect to the SRT stream in caller mode and view the video successfully?

We’d appreciate your thoughts on whether this approach is feasible or recommended.