State of Linux Audio in 2009 - Linux Plumbers Conference 2009State of Linux Audio in 2009 Linux...
Transcript of State of Linux Audio in 2009 - Linux Plumbers Conference 2009State of Linux Audio in 2009 Linux...
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State of Linux Audio in 2009
Linux Plumbers Conference 2009
Lennart [email protected]
September 2009
Lennart Poettering State of Linux Audio in 2009
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Who Am I?
Software Engineer at Red Hat, Inc.
Developer of PulseAudio, Avahi and a few other Free Softwareprojects
http://0pointer.de/lennart/
IRC: mezcalero
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Perspective
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So, what happened since last LPC?
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RIP: EsounD is officially gone.
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RIP: OSS is officially gone.
(at least on Fedora)
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RIP: OSS is officially gone. (at least on Fedora)
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Audio API Guide
http://0pointer.de/blog/projects/guide-to-sound-apis
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We now use realtime scheduling on the desktop by default.
Wealso make use of high-resolution timers on the desktop by default.
Lennart Poettering State of Linux Audio in 2009
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We now use realtime scheduling on the desktop by default. Wealso make use of high-resolution timers on the desktop by default.
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2s Buffers
Lennart Poettering State of Linux Audio in 2009
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We moved a couple of things into the audio server:
Timer-based audio scheduling; mixing; flat volume/volume rangeand granularity extension; integration of volume sliders; mixer
abstraction; monitoring
Mixer abstraction? Due to user-friendliness, i18n, meta data(icons, ...)
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We moved a couple of things into the audio server:
Timer-based audio scheduling; mixing; flat volume/volume rangeand granularity extension; integration of volume sliders; mixer
abstraction; monitoring
Mixer abstraction? Due to user-friendliness, i18n, meta data(icons, ...)
Lennart Poettering State of Linux Audio in 2009
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udev integration: meta data, by-path/by-id/...
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Bluetooth Audio, A2DP, HSP/HFP, Lip-Sync!
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ALSA mixer initialization database
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Other: Drivers for X-Fi, LSB work
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What are the challenges to tackle until next LPC?
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Drivers: Power saving distortions
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Drivers: Incorrect dB information
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Drivers: Wrong mixer element names
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Drivers: Missing/broken device strings
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Drivers: Non-standard negotiation logic
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Drivers: Missing from mixer initialization database
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Drivers: Broken timing
snd pcm delay(), snd pcm avail()
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ALSA API addition:
Multi-PCM clock synchronization
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ALSA API addition:
Routing/PCM-to-mixer-element mapping/auto discovery
Current system depends on assumptions made based on consumerhardware, which doesn’t scale to professional and embedded
hardware
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ALSA API addition:
Jack sensing, labelling, colouring, matching
Mixed HW/SW switching
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ALSA API addition:
Timing/data transfer granularity
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ALSA API addition:
Channel mapping, current system does not scale
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ALSA API addition:
Latency control, Hifi DSP
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ALSA:
HDMI negotiation
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ALSA:
Atomic status updates
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ALSA:
Atomic mixer updates?
PCM synchronized mixer updates?
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General:
Codec pass-through for A2DP, SPDIF, HDMI, embedded
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General:
Simpler, high-level PCM API
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General:
20s Buffering
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General:
Revoking, synchronous session switching
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That’s all, folks.
Any questions?
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That’s all, folks.
Any questions?
Lennart Poettering State of Linux Audio in 2009