Difference between revisions of "OE Audio Progs"
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<!-- /**************************************** Page Description Text ****************************************/ --> | <!-- /**************************************** Page Description Text ****************************************/ --> | ||
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| − | + | By default, EMAC OE 5.X comes with two audio packages: ALSA and mpg123. More packages and applications are available from EMAC at a customer's request. | |
__TOC__ | __TOC__ | ||
| + | |||
| + | ==ALSA== | ||
| + | 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. | ||
| + | <cl> | ||
| + | * <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. | ||
| + | <br/> | ||
| + | ::[[File:Alsamixer_screen.jpg|600px|thumb|left|Figure 1: Example of <code>alsamixer</code>]] | ||
| + | <br clear=all> | ||
| + | * <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 by remounting the filesystem read-write, changing the settings, storing them, then remounting the filesystem read-only. | ||
| + | {{clo}} | ||
| + | {{clio | hostname=emac-oe | oemntrw }} | ||
| + | {{clio | hostname=emac-oe | alsamixer }} | ||
| + | #make necessary changes... | ||
| + | |||
| + | {{clio | hostname=emac-oe | alsactl store }} | ||
| + | {{clio | hostname=emac-oe | oemntrw -r}} | ||
| + | {{clos}} | ||
| + | |||
| + | :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) | ||
| + | * <code>aplay</code> is a command-line soundfile player 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. | ||
| + | * <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. | ||
| + | * <code>speaker-test</code> generates a series of sounds from the different channels of the default (or user specified) audio device. Some example tests are as follows: | ||
| + | </cl> | ||
| + | :Outputting a voice identifying each channel | ||
| + | {{cli | hostname=emac-oe | speaker-test -t wav -l 1 -c 2}} | ||
| + | :Outputting a sine wave tone to each channel | ||
| + | {{cli | hostname=emac-oe | speaker-test -t sine -l 1 -c 2 -f 550}} | ||
| + | |||
| + | ==mpg123== | ||
| + | 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). | ||
| + | |||
| + | <!-- /*********************************************************************************************************/ --> | ||
| + | <!-- /****************************************** More Information *****************************************/ --> | ||
| + | <!-- /*********************************************************************************************************/ --> | ||
| + | {{:Templateimpl:moreinfo | initials=KY | title=Audio Programs | desc=Audio programs included with EMAC OE5.X | project=OE 5.0 }} | ||
| + | * | ||
| + | |||
| + | {{:Templateimpl:whatnext | initials=KY | title=Audio Programs | desc=Audio programs included with EMAC OE5.X | project=OE 5.0 }} | ||
| + | * [http://www.alsa-project.org/main/index.php/Documentation ALSA Official Documentation] | ||
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| − | {{:Templateimpl:bg | initials=KY | title=Audio Programs | desc=Audio programs included with EMAC OE5.X | project=OE 5.0 }} | + | <!--{{: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 }} | + | <!--{{:Templateimpl:geninfo | initials=KY | title=Audio Programs | desc=Audio programs included with EMAC OE5.X | project=OE 5.0 }}--> |
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Revision as of 13:29, 12 November 2015
By default, EMAC OE 5.X comes with two audio packages: ALSA and mpg123. More packages and applications are available from EMAC at a customer's request.
ALSA
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.
-
alsamixeris an ncurses mixer program for use with the ALSA soundcard drivers. It supports multiple soundcards with multiple devices. Thealsamixermenu 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 thealsamixerinterface is shown in Figure 1.
-
alsactlis used to control advanced settings for the ALSA soundcard drivers. It supports multiple soundcards. Also, thealsactl storecommand is used to store driver setup and changes made inalsamixerto the static configuration file. The following example demonstrates changing the settings for the default sound card by remounting the filesystem read-write, changing the settings, storing them, then remounting the filesystem read-only.
root@emac-oe:~# oemntrw root@emac-oe:~# alsamixer #make necessary changes...
root@emac-oe:~# alsactl store root@emac-oe:~# oemntrw -r- Aside from the store function,
alsactlhas a few other commands available. Therestorecommand is used to load current driver setup for one or each soundcards from configuration file, theinitcommand initialize driver and settings to a default state, and thenamescommand dumps information about all the known present (sub-)devices into configuration file (namescommand is deprecated)
-
aplayis a command-line soundfile player 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. -
arecordis 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. -
speaker-testgenerates a series of sounds from the different channels of the default (or user specified) audio device. Some example tests are as follows:
- Outputting a voice identifying each channel
root@emac-oe:~# speaker-test -t wav -l 1 -c 2- Outputting a sine wave tone to each channel
root@emac-oe:~# speaker-test -t sine -l 1 -c 2 -f 550mpg123
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).
Further Information
Where to Go Next
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