104 lines
3.4 KiB
Markdown
104 lines
3.4 KiB
Markdown
---
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title:
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- A Day in the Life of a Media Plumber
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author:
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- Sanchayan Maity
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theme:
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- default
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classoption:
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- aspectratio=169
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---
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# Who
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- Who am I?
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* Embedded Systems background
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* Prefer C, Haskell and Rust
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* Organize and speak at Rust and Haskell meet-ups in Bangalore
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- Work?
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* Software Engineer @ [asymptotic](https://asymptotic.io/)
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* Open source consulting firm based out of Bangalore and Toronto
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* Work on low level systems software centred around multimedia
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* GStreamer, PipeWire, PulseAudio
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* Language Polyglots
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# Open source contributions
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- [GStreamer](https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests?scope=all&state=all&author_username=SanchayanMaity)
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- [gst-plugins-rs](https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests?scope=all&state=all&author_username=SanchayanMaity)
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- [PipeWire](https://gitlab.freedesktop.org/pipewire/pipewire/-/merge_requests?scope=all&state=all&author_username=SanchayanMaity)
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- [PulseAudio](https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests?scope=all&state=all&author_username=SanchayanMaity)
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- [Linux](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/?qt=author&q=Sanchayan+Maity)
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- [u-boot](https://source.denx.de/u-boot/u-boot/-/commits/master?search=Sanchayan%20Maity)
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# GStreamer
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- Multiplatform Pipeline based multimedia framework
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- Bindings for various languages
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- Allows building complex media processing workflows
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- Some applications
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* PiTiVi (Video Editor)
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* amaroK, Banshee, Clementine (audio players)
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* Empathy (VOIP and video conferencing)
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* GstLAL (gravitational wave data analysis)
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* Rygel (DLNA streaming server and renderer)
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* Totem (movie player for the GNOME desktop)
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# Simple pipeline
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```bash
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gst-launch-1.0 videotestsrc ! autovideosink
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gst-launch-1.0 audiotestsrc ! autoaudiosink
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```
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# Media pipeline[^1]
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{width=80%}
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[^1]: [Dynamic Pipelines](https://gstreamer.freedesktop.org/documentation/tutorials/basic/dynamic-pipelines.html?gi-language=c)
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# Internals[^2]
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{width=60%}
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[^2]: [Raw Video Media Types](https://gstreamer.freedesktop.org/documentation/additional/design/mediatype-video-raw.html?gi-language=c)
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# Alpha compositing[^3]
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- How does it look?
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[^3]: [Alpha Compositing - Bartosz Ciechanowski](https://ciechanow.ski/alpha-compositing/)
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# Demo
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- Using Cairo[^4][^5]
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[^4]: [GStreamer Cairo example](https://gitlab.freedesktop.org/gstreamer/gstreamer/-/blob/main/subprojects/gst-plugins-good/tests/examples/cairo/cairo_overlay.c?ref_type=heads)
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[^5]: [GStreamer Cairo example project](https://git.sanchayanmaity.net/sanchayanmaity/cairo-overlay-example)
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# Rounded corners
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{width=60%}
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```bash
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gst-launch-1.0 filesrc location=bunny.mp4 ! decodebin ! videoconvert !
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roundedcorners border-radius-px=100 ! videoconvert ! gtksink
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```
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# Getting started
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- [GStreamer Basic Tutorial](https://gstreamer.freedesktop.org/documentation/tutorials/basic/index.html?gi-language=c)
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- [GStreamer Application Development](https://gstreamer.freedesktop.org/documentation/application-development/index.html?gi-language=c)
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# Questions
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- Reach out on
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* Email: sanchayan@sanchayanmaity.net
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* Mastodon: https://sanchayanmaity.com/@sanchayan
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* Telegram: https://t.me/SanchayanMaity
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* Blog: sanchayanmaity.net
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