Recent Developments in the PulseAudio World Arun Raghavan - - PowerPoint PPT Presentation

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Jan 28, 2024 318 likes •699 views

Recent Developments in the PulseAudio World Arun Raghavan Collabora Feature-rich audio server Convenient client API Some rough bumps early on Lots of FUD afterwards More and more people love us Okay, fine More and more people don't hate us

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Recent Developments in the PulseAudio World Arun Raghavan Collabora

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Feature-rich audio server Convenient client API

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Some rough bumps early on

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Lots of FUD afterwards

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More and more people love us

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Okay, fine More and more people don't hate us

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Ubuntu, Fedora, OpenSUSE GNOME, maybe even KDE one day Wine(!)

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The People

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Colin Guthrie: maintainer; * Arun Raghavan: committer; * Tanu Kaskinen: committer-in-waiting; ALSA, misc David Henningson: ALSA, misc Maarten Bosmans: RTP, Win32, build, more Pierre-Louis Bossart: Power, performance, misc Lots of others

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So we're alive and kicking

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We did a 1.0 release

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It took 2½ years

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But it's awesome ;)

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DBus protocol Source-ouput volumes Echo cancellation Windows, OS X ports Equalizer RTP improvements Passthrough Deferred volumes Optimisations

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And there's more to come ...

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Jack detection ALSA UCM Dynamic sample rate changes WebRTC echo canceller Drift compensation, AGC Module loader Configuration API Moar Orc Fixed rate resamplers

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Exciting times ahead ...

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A little more about passthrough

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Problem: we'd like to use hardware audio decoders

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Challenge: PulseAudio needs fixed bytes-to-ms conversion

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Solution: Support only fixed bytes-to-ms conversion (IEC 61937)

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Format negotiation ╭──────╮ ╭──────╮ │client│ ──▷ requested formats ──▷ │server│ ╰──────╯ ╰──────╯ ╭──────╮ ╭──────╮ │client│ ◁── selected format ◁── │server│ ╰──────╯ ╰──────╯

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Notification on format change

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Changes to GStreamer

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baseaudiosink does payloading IEC 61937 payloading in pbutils

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playbin2/playsink understands compressed sinks (go slomo!)

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pulsesink now does AC3/DTS/MP3

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pulseaudiosink is a new bin to handle format changes

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AC3 sink ╭───────────────playbin2────────────────╮ │ │ │ ╭─pulseaudiosink─╮ │ │ ╭────────╮ │ ╭─────────╮ │ │ │ ...──▷│ac3parse│──▷│──▷│pulsesink│ │ │ │ ╰────────╯ │ ╰─────────╯ │ │ │ ╰────────────────╯ │ │ │ ╰───────────────────────────────────────╯

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PCM sink ╭───────────────────────playbin2───────────────────────╮ │ │ │ ╭────────pulseaudiosink────────╮ │ │ ╭────────╮ │ ╭──────────╮ ╭─────────╮ │ │ │ ...──▷│ac3parse│──▷│──▷│decodebin2│──▷│pulsesink│ │ │ │ ╰────────╯ │ ╰──────────╯ ╰─────────╯ │ │ │ ╰──────────────────────────────╯ │ │ │ ╰──────────────────────────────────────────────────────╯

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All this will be in the next gst-plugins-good (0.10.31)

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GStreamer 1.0 will provide better upstream renegotiation

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But we finally closed bug 331875 (took only 5 years :p)

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Questions?

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