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9604dea90a
Closed caption support in NDI is described as a proposal in [1] & [2]. The proposal consists in encapsulating c608 or c708 closed caption in ADF packets and pushing them in an XML tag as part of NDI Metadata. This commit implements this proposal. [1]: http://www.sienna-tv.com/ndi/ndiclosedcaptions.html [2]: http://www.sienna-tv.com/ndi/ndiclosedcaptions608.html Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1320>
103 lines
4.2 KiB
Markdown
103 lines
4.2 KiB
Markdown
GStreamer NDI Plugin
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====================
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*Compatible with NDI SDK 5.x*
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This is a plugin for the [GStreamer](https://gstreamer.freedesktop.org/)
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multimedia framework that allows GStreamer to receive or send an
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[NDI](https://www.newtek.com/ndi/) stream.
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This plugin has been initially developed by [Teltek](http://teltek.es/) and
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was funded by the [University of the Arts London](https://www.arts.ac.uk/) and
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[The University of Manchester](https://www.manchester.ac.uk/).
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Currently the plugin has a source element for receiving from NDI sources, a
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sink element to provide an NDI source and a device provider for discovering
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NDI sources on the network.
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The plugin is loading the NDI SDK at runtime, either from the default library
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path or, if set, from the directory given by the `NDI_RUNTIME_DIR_V5`
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environment variable.
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Some examples of how to use these elements from the command line:
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```console
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# Information about the elements
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$ gst-inspect-1.0 ndi
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$ gst-inspect-1.0 ndisrc
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$ gst-inspect-1.0 ndisink
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# Discover all NDI sources on the network
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$ gst-device-monitor-1.0 -f Source/Network:application/x-ndi
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# Audio/Video source pipeline
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$ gst-launch-1.0 ndisrc ndi-name="GC-DEV2 (OBS)" ! ndisrcdemux name=demux demux.video ! queue ! videoconvert ! autovideosink demux.audio ! queue ! audioconvert ! autoaudiosink
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# Audio/Video sink pipeline
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$ gst-launch-1.0 videotestsrc is-live=true ! video/x-raw,format=UYVY ! ndisinkcombiner name=combiner ! ndisink ndi-name="My NDI source" audiotestsrc is-live=true ! combiner.audio
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```
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Feel free to contribute to this project. Some ways you can contribute are:
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* Testing with more hardware and software and reporting bugs
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* Doing pull requests.
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Closed Captions Support
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-----------------------
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Closed captions support is based on [1] & [2].
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This pipelines streams a test video with test subtitles from
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gst-plugins-rs/video/closedcaption. Run from the gst-plugins-rs root directory.
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```console
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# Audio/Video sink pipeline with closed captions (cc start around 0:00:14)
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$ gst-launch-1.0 \
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ndisinkcombiner name=ndicombiner ! ndisink ndi-name="My NDI source" \
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cccombiner name=cccombiner ! videoconvert ! video/x-raw,format=UYVY ! ndicombiner.video \
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videotestsrc is-live=true ! cccombiner. \
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filesrc location=video/closedcaption/tests/dn2018-1217.scc ! sccparse ! cccombiner.caption \
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audiotestsrc is-live=true volume=0.1 ! ndicombiner.audio
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# Discover all NDI sources on the network
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$ gst-device-monitor-1.0 -f Source/Network:application/x-ndi
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# Audio/Video source pipeline with closed caption overlay
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$ gst-launch-1.0 \
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ndisrc ndi-name="_REPLACE_WITH_SOURCE_NAME_" ! ndisrcdemux name=demux \
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demux.video ! queue ! cea608overlay ! videoconvert ! autovideosink \
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demux.audio ! queue ! audioconvert ! autoaudiosink
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# Variant 1: sink pipeline with c708 closed captions
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$ gst-launch-1.0 \
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ndisinkcombiner name=ndicombiner ! ndisink ndi-name="My NDI source" \
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cccombiner name=cccombiner ! videoconvert ! video/x-raw,format=UYVY ! ndicombiner.video \
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videotestsrc is-live=true ! cccombiner. \
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filesrc location=video/closedcaption/tests/dn2018-1217.scc ! sccparse ! ccconverter ! closedcaption/x-cea-708,format=cdp ! cccombiner.caption \
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audiotestsrc is-live=true volume=0.1 ! ndicombiner.audio
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# Variant 2: sink pipeline with c608 and c708 closed captions
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$ gst-launch-1.0 \
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ndisinkcombiner name=ndicombiner ! ndisink ndi-name="My NDI source" \
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cccombiner name=cccombiner_1 ! cccombiner name=cccombiner_2 ! videoconvert ! video/x-raw,format=UYVY ! ndicombiner.video \
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videotestsrc is-live=true ! cccombiner_1. \
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filesrc location=video/closedcaption/tests/dn2018-1217.scc ! sccparse ! tee name=cctee \
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cctee. ! ccconverter ! closedcaption/x-cea-608,format=raw ! cccombiner_1.caption \
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cctee. ! ccconverter ! closedcaption/x-cea-708,format=cdp ! cccombiner_2.caption \
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audiotestsrc is-live=true volume=0.1 ! ndicombiner.audio
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```
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[1]: http://www.sienna-tv.com/ndi/ndiclosedcaptions.html
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[2]: http://www.sienna-tv.com/ndi/ndiclosedcaptions608.html
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License
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-------
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This plugin is licensed under the MPL-2 - see the [LICENSE](LICENSE-MPL-2.0) file for details
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Acknowledgments
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-------
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* University of the Arts London and The University of Manchester.
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* Sebastian Dröge (@sdroege).
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