[AGL6.x][4a-softmixer]Question about purpose of using snd-aloop in module softmixer

Hello,

   My name is Frank Luo, and I am an engineer of Neusoft.

    I just started studying the AGL audio system.

    After Reading the code of softmixer, I  realized that this module based on snd_aloop driver.  However,  I have a questions about this.

    What's the purpose of using this aloop as a sound card ? 

        Audio data is passthrough the loop sound card(card 0), than written into the real sound card(card 1) by softmixer. The alsa plugins, including dmix plugin, are based on the real sound card.

        Audio data can be directly written into the real card(with the dmix plugin). So, I am wondering if  you could send me the intent of appending  this snd_aloop driver.

  Thank you, and I look forward to hearing from you.

Best Regards

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Frank Luo(罗鹏)

Neusoft Automotive Solution Business Unit

Neusoft Corporation

901 Huangpu Road High-Tech Zone Dalian 116085, PRC

Tel: (86 411) 8446 6663

Fax: ((86 411) 8446 6742

Mobile:15840620310

Email:luo.p@neusoft.com

www.neusoft.com

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