asynchronous usb audio

code is simply to deliver a real-time transmission request, the application will naturally have a buffer overflow issue when calling it cyclically. Change to use threads to combine events and semaphores in the driver. Up to five real-time transmission requests can be shipped into the asynchronous waiting queue of the kernel, when a dual-end cyclic queue is introduced to manage the buffer zone, there is basically no data loss problem. Note that the va

(Adaptive) asy (asynchronous. In isochronous transaction SYN synchronous mode: low-end USBSound CardWidely used . This method is available Stable bandwidth, but the clock is dominated by computer clock , But because The USB clock provided by the computer and the clock required for audio file playback sometimes have a base difference , Will generate Impact Sound

In general, the chassis we can buy now provides front-end USB and front-end audio as well as switch-key functions. And the need for us to connect including switch machine button, hard drive indicator, audio interface and USB cable. It is easy to install the audio and

I. Background:The kernel version of ARM Linux is 3.13.0Two. Preparatory workAdd ALSA drivers to the kernel, that is, when compiling the kernel, add the following options:You can then recompile the kernel toThree. Cross-compiling Alsa-lib and Alsa-utils (Alsa-utils is a series of audio device control tools, and Alsa-lib is a library of alsa-utils dependencies, so the Alsa-lib is compiled first)3.1 Cross-compiling alsa-lib3.2 Cross-compiling alsa-utilsF

After asynchronous audio and video processing, the callback function always obtains the POST parameter. {Code...} although the callback failed to get the parameter, the execution was successful and the file was also processed. How can this problem be solved? After asynchronous audio and video processing, the callback f

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