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This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
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Distribution: Debian, Red Hat, Slackware, Fedora, Ubuntu
PulseAudio 4.0 released
PulseAudio 4.0 Release Notes
Changes at a glance
Better handling of low latency requests
Optimisations while mixing (generic, ARM NEON)
Default resampler is now speex-float-1 (lower CPU usage)
Major Bluetooth refactoring for better reliability and easier maintenance
Fixes for graceful hand-off to/from JACK
New module to apply ducking based on stream roles
Echo canceller infrastructure fixes
Bash and zsh completion for command line tools
Solaris and OS X fixes
Lots of other enhancements, bug fixes, and documenation and i18n updates
Notes for Application Developers
So far card profiles have been static, that is, the set of profiles on a card has never changed after the creation of the card object. While that has never been promised in the API documentation, it may be that some applications have the assumption that the profiles are static. Due to the nature of the Bluetooth protocol, it has turned out to be necessary to be able to add profiles to a card after it has been created. So, make sure your application doesn't crash or otherwise behave badly if new profiles suddenly appear on a card. It's best to prepare for profiles disappearing too.
It is now possible to track operation state via a callback using the newly added pa_operation_set_state_callback().