Difference between revisions of "OE Audio Progs"

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==ALSA==
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ALSA, or the Advanced Linux Sound Architecture, is a part of the Linux Kernel and is a software framework that provides an API for sound devices. The ALSA framework includes several applications for working with sound.
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  * <code>alsamixer</code> is an ncurses mixer program for use with the ALSA soundcard drivers. It supports multiple soundcards with multiple devices. The <code>alsamixer</code> menu displays a volume bar for each audio device present on the system. Adjusting these volume bars (with the arrow keys and 'm' for mute) allows changing of the output or input device volume corresponding to the given bar. An example of the <code>alsamixer</code> interface is shown in Figure 1.
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::[[File:Alsamixer_screen.jpg|600px|thumb|left|Figure 1: Example of <code>alsamixer</code>]]
 
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  * <code>alsactl</code> is used to control advanced settings for the ALSA soundcard drivers. It supports multiple soundcards. Also, the <code>alsactl store</code> command is used to store driver setup and changes made in <code>alsamixer</code> to the static configuration file. The following example demonstrates changing the settings for the default sound card:
 
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<syntaxhighlight lang=bash>
 
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root@emac-oe:~# alsamixer
 
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#make necessary changes
 
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...
 
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root@emac-oe:~# alsactl store
 
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</syntaxhighlight>
 
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:Aside from the store function, <code>alsactl</code> has a few other commands available. The <code>restore</code> command is used to load current driver setup for one or each soundcards from configuration file, the <code>init</code> command initialize driver and settings to a default state, and the <code>names</code> command dumps information about all the known present (sub-)devices into configuration file (<code>names</code> command is deprecated)
 
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  * <code>aplay</code> is  a  command-line  soundfile  recorder  for  the ALSA soundcard driver. It supports several file formats and multiple soundcards with multiple devices. For supported soundfile formats, the sampling rate, bit depth, and so forth can be  automatically  determined from the soundfile header.
 
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  * <code>arecord</code> is  a  command-line  soundfile  recorder  for  the ALSA soundcard driver. It supports several file formats and multiple soundcards with multiple devices. If recording with interleaved mode samples the file is automatically split before the 2GB filesize.
 
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  * <code>speaker-test</code> generates a series of sounds from the different channels of the default (or user specified) audio device. Some example tests include:
 
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<syntaxhighlight lang=bash>
 
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# Outputs a voice identifying each channel
 
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root@emac-oe:~# speaker-test -t wav -l 1 -c 2
 
  
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# Outputs a sine wave tone to each channel
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root@emac-oe:~# speaker-test -t sine -l 1 -c 2 -f 550
 
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</syntaxhighlight>
 
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==mpg321==
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mpg321 is a simple and lightweight command line mp3 player. It is designed for use on front ends, shell scripts, as an mp3 player and as an mp3 to wave file decoder (primarily for use with CD-recording software).
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==Mplayer==
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Mplayer is a video player for Linux. It plays most common video and audio formats. Mplayer is provided for video support but is also used on headless systems for additional audio support.
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{{:Templateimpl:bg | initials=KY | title=Audio Programs | desc=Audio programs included with EMAC OE5.X | project=OE 5.0 }}
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{{:Templateimpl:geninfo | initials=KY | title=Audio Programs | desc=Audio programs included with EMAC OE5.X | project=OE 5.0 }}
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{{:Templateimpl:using | initials=KY | title=Audio Programs | desc=Audio programs included with EMAC OE5.X | project=OE 5.0 }}
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{{:Templateimpl:examples | initials=KY | title=Audio Programs | desc=Audio programs included with EMAC OE5.X | project=OE 5.0 }}
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{{:Templateimpl:conclusion | initials=KY | title=Audio Programs | desc=Audio programs included with EMAC OE5.X | project=OE 5.0 }}
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{{:Templateimpl:moreinfo | initials=KY | title=Audio Programs | desc=Audio programs included with EMAC OE5.X | project=OE 5.0 }}
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{{:Templateimpl:whatnext | initials=KY | title=Audio Programs | desc=Audio programs included with EMAC OE5.X | project=OE 5.0 }}
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Revision as of 11:13, 12 November 2015

TODO: {{#todo: NotStarted (11.12.2015-11:13->KY+)|Kyoungmeyer|OE 5.0,KY,NotStarted}}

Put the page description text here.

Background

General Information

Audio Programs

Examples

Conclusion

Further Information

Where to Go Next
Pages with Related Content
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