opus_stream_tool

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opus_stream_tool

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It records opus-rtp media to files

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This tool allows to record ogg formatted opus file for given RTP pcap.

Examples
========

#### Record opusfile from pcap containing RTP-stream

##### In one step using `pcap_to_opus.py`

TODO

##### In two step using `tshark` and `hex_to_opus.py`.

In case we have a `in.pcap` that contains the ethernet frames and UDP and RTP encapsulation, we can record audio like the following.

```
tshark -x -r in.pcap -Y "udp.srcport == myport" | cut -d " " -f 1-20 > tmp.txt
hex_to_opus.py -x tmp.txt --recordfile out.opus --rtpoffset 42
```

And if the pcap contains ethernet layer and UDP header, then rtpoffset(=42) should contain the length of those headers.

For encrypted packets, we can specify the srtpkey.

```
hex_to_opus.py -x tmp.txt --recordfile out.opus --rtpoffset 42 --srtpkey somebase64key
```

It is also possible to filter using `ssrc` and payload type.

```
hex_to_opus.py -x tmp.txt --recordfile out.opus --rtpoffset 42 --srtpkey somebase64key --ssrc 1234 --payloadtype 111
```

Requirements
=============

- Python 3 (TODO make a python2.7 version)
    - pylibsrtp (pip install pylibsrtp)

Gstreamer plugin for video
===========================

A gstreamer based video recorder is added as well.

```
tshark -x -r in.pcap -Y "udp.srcport == myport" | cut -d " " -f 1-20 > tmp.txt
hex_to_h264_gst_rfc3984.py -r output.mp4 -x tmp.txt --rtpoffset 42 -k "srtpkey"
```

Links
========

- similar tools for amr [Codec payload Extractor](https://github.com/Spinlogic/AMR-WB_extractor)
    - [pylibsrtp](https://pylibsrtp.readthedocs.io/en/latest/)
    - [srtp-decrypt](https://github.com/gteissier/srtp-decrypt)
    - [opus-tools](https://opus-codec.org/downloads/)

opus_stream_tool

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