|
PulseAudio is a network-capable sound server hosted at freedesktop.org. Supported operating systems include Linux, the BSDs including Mac OS X, Solaris as well as Microsoft Windows. PulseAudio is free and open-source software subject to the terms of the GNU Lesser General Public License 2.1.〔 It was created in 2004 under the name Polypaudio but was renamed in 2006 to PulseAudio. == Software architecture == PulseAudio is a sound server, a background process accepting sound input from one or more ''sources'' (processes or capture devices) and redirecting it to one or more ''sinks'' (sound cards, remote network PulseAudio servers, or other processes). One of the goals of PulseAudio is to reroute all sound streams through it, including those from processes that attempt to directly access the hardware (like legacy OSS applications). PulseAudio achieves this by providing adapters to applications using other audio systems, like aRts and ESD. In a typical installation scenario under Linux, the user configures ALSA to use a virtual device provided by PulseAudio. Thus, applications using ALSA will output sound to PulseAudio, which then uses ALSA itself to access the real sound card. PulseAudio also provides its own native interface to applications that want to support PulseAudio directly, as well as a legacy interface for ESD applications, making it suitable as a drop-in replacement for ESD. For OSS applications, PulseAudio provides the padsp utility, which replaces device files such as /dev/dsp, tricking the applications into believing that they have exclusive control over the sound card. In reality, their output is rerouted through PulseAudio.Few programs cannot communicate with PulseAudio: Sound source → libALSA → PulseAudio → ALSA driver → hardware Most can: Sound source → PulseAudio → ALSA driver → Hardware PulseAudio is network-capable: Sound source → PulseAudio → network → PulseAudio → ALSA driver → hardware A program can circumvent PulseAudio and communicate directly with the soundcard driver: Sound source → ALSA driver → Hardware A program can circumvent PulseAudio and communicate with the ALSA soundserver: Sound source → libALSA → ALSA driver → hardware 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「PulseAudio is a network-capable sound server hosted at freedesktop.org. Supported operating systems include Linux, the BSDs including Mac OS X, Solaris as well as Microsoft Windows.PulseAudio is free and open-source software subject to the terms of the GNU Lesser General Public License 2.1.It was created in 2004 under the name Polypaudio but was renamed in 2006 to PulseAudio.== Software architecture ==PulseAudio is a sound server, a background process accepting sound input from one or more ''sources'' (processes or capture devices) and redirecting it to one or more ''sinks'' (sound cards, remote network PulseAudio servers, or other processes).One of the goals of PulseAudio is to reroute all sound streams through it, including those from processes that attempt to directly access the hardware (like legacy OSS applications). PulseAudio achieves this by providing adapters to applications using other audio systems, like aRts and ESD.In a typical installation scenario under Linux, the user configures ALSA to use a virtual device provided by PulseAudio. Thus, applications using ALSA will output sound to PulseAudio, which then uses ALSA itself to access the real sound card. PulseAudio also provides its own native interface to applications that want to support PulseAudio directly, as well as a legacy interface for ESD applications, making it suitable as a drop-in replacement for ESD.For OSS applications, PulseAudio provides the padsp utility, which replaces device files such as /dev/dsp, tricking the applications into believing that they have exclusive control over the sound card. In reality, their output is rerouted through PulseAudio.Few programs cannot communicate with PulseAudio:Sound source → libALSA → PulseAudio → ALSA driver → hardwareMost can:Sound source → PulseAudio → ALSA driver → HardwarePulseAudio is network-capable:Sound source → PulseAudio → network → PulseAudio → ALSA driver → hardwareA program can circumvent PulseAudio and communicate directly with the soundcard driver:Sound source → ALSA driver → HardwareA program can circumvent PulseAudio and communicate with the ALSA soundserver:Sound source → libALSA → ALSA driver → hardware」の詳細全文を読む スポンサード リンク
|