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linux:alsa [2016/03/29 11:32] – created niziaklinux:alsa [2016/03/29 12:13] (current) – niziak
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 ====== Alsa ====== ====== Alsa ======
-===== asound.conf =====+Official Alsa pages: 
 +  * [[http://www.alsa-project.org/main/index.php/Asoundrc|Asoundrc]] 
 +  * [[http://alsa.opensrc.org/Asoundrc]] 
 +  * [[http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html|Alsa PCM plugins]] 
 + 
 +Very precious notes from users: 
 +  * [[http://www.volkerschatz.com/noise/alsa.html]] 
 +  * [[http://www.sabi.co.uk/Notes/linuxSoundALSA.html|Linux ALSA sound notes]] 
 + 
 +===== asoundrc / asound.conf ===== 
 By default sound is processed through dmix plugin which handles rate and channels conversion. By default sound is processed through dmix plugin which handles rate and channels conversion.
 +
 +
  
 ==== Plugin: hw ==== ==== Plugin: hw ====
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 </code> </code>
 With settings above, there is no possiblity to play mono sound (channel=1), when there is stereo audio device. With settings above, there is no possiblity to play mono sound (channel=1), when there is stereo audio device.
 +
 +Change default card:
 +<code>
 +pcm.!default {
 +  type hw
 +  card 1
 +  device 3
 +}
 +
 +ctl.!default {
 +  type hw
 +  card 1
 +  device 3
 +}
 +</code>
  
 ==== Plguin: plug ==== ==== Plguin: plug ====
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 } }
 </code> </code>
 +There might be problems with some programs though. Some applications always try to open a control device with the same name as the pcm device they are given, so you may also need to create a dummy control device with the same name:
 +<code>
 +ctl.!default {
 +    type hw
 +    card 0
 +}
 +</code>
 +
 +==== Plugin: asym ====
 +asym is an ALSA PCM plugin that combines half-duplex PCM plugins like dsnoop and dmix into one full-duplex device.
 +[[http://alsa.opensrc.org/Asym]]
 +
 +==== Plugin: dmix ====
 +PCM plugins extend the functionality of PCM devices allowing low-level sample conversions and copying between channels, files and soundcard devices. The dmix plugin provides for direct mixing of multiple streams.
 +[[http://alsa.opensrc.org/Dmix]]