bus alsa

1) download ALSA Lib. Http://www.alsa-project.org/main/index.php/Main_Page 2) tar jxvf alsa-lib-1.0.19.tar.bz2 3) CD alsa-lib-1.0.19 4) CC = $ (cross_compile)./configure -- target = arm-Linux -- Host = i686-linux -- prefix = ~ /Alsalib_arm 5) make 6) make install When compiling an app, # include First: Cflags =-I/home/BEN L

From bottom to top, they are ALSA driver, ALSA Lib, and ALSA application: ALSA applications include aplay and arecord. They are ALSA utils tools. These tools are very good for testing drivers. ALSA lib provides function libraries

Alsamixer after running press letter M (Mute by B) This article is mainly about the implementation of the multi-sound streaming under arch gnome and the opening of event sound effects (that is, background music like window or KDE's open machine, and some sound effects during operation)Note: The sound card supports the hardware mix friend, does not need to aim at the younger brother's Raven,1. Install the required packages#pacman-sy alsa-driver

After the upgrade of the sound card suddenly can not use, find a lot of methods, and finally reinstall ALSA Drive solution. Back up for later use. You can refer to the compile alsa-utils here when there are errors, to install Xmlot, with the new profit search installation can be 1157 sudo gedit/etc/modprobe.d/alsa-base.conf 1160 CD

The Android system supports ALSA but is not downloaded or compiled by default. YesFollow these steps to use ALSA in Android. 1. Use git to obtain the following three ALSA-related packages and place them in the corresponding location.Git clone git: // android.git.kernel.org/platform/external/alsa-lib.gitGit clone git: /

Part of this article refers to the blog from Droidphone (http://blog.csdn.net/droidphone/article/details/6271122), about Alsa writing a very good article, just a few examples. This article is a combination of examples to analyze the ALSA audio driver.Development environment: ubuntu10.04Target board: linux-2.6.37 (view Linux kernel information via command uname-r)Compiler: arm-none-linux-gnueabi-(None on beh

Statement: the content of this blog is created at http://blog.csdn.net/droidphone. please refer to it for help. Thank you!Control Interface The control interface allows the user space application (ALSA-Lib) to access and control multiple switches and sliding controls in the Audio Codec Chip. For mixer (sound mixing), the control interface is particularly important. Starting from ALSA 0.9.x, all mixer oper

= s3c_pcm_suspend, .resume = s3c_pcm_resume,}; Call snd_soc_register_platform () to register an snd_soc_platform struct with ALSA core. The member pcm_new needs to call dma_alloc_writecombine () to allocate a write-combining memory space to the DMA, and save the information about the buffer to substream-> dma_buffer, which is equivalent to the constructor. Pcm_free is the opposite. These member functions are fairly simple. You can u

From http://www.rpsys.net/openzaurus/patches/alsa/info.htmlALSA SoC LayerThe overall project goal of the ALSA system on Chip (ASOC) layer are to provide better ALSA support for embedded System on Chip processors (e.g Pxa2xx, au1x00, IMX, etc) and portable audio codecs. Currently there is some support on the kernel for SoC audio, however it has some limitations:-

This article was reproduced from: http://blog.csdn.net/luckywang1103/article/details/48053015Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.Directory (?) [+]Since the standard ALSA is not used by default in Android, it uses Tinyalsa, so even command-line-based testing uses LIBTINYALSA. The Android system can be seen in real-time, such as audio channel switching, when the upper-level audio is

Snd_pcm_lib_read_transfer copy data to the user's buffer. The control interface primarily allows user-space Applications (ALSA-LIB) to access and manage the multi-channel switches, sliding controls, etc. in the audio codec chip. The control interface is particularly important for mixer (remix), starting with the Alsa 0.9.x version, where all mixer work is done through the API of the control interface. Def

Logical Address virtual address physical address bus address difference, logical Bus 1. Logical Address Logical Address is the most vague concept. The explanation in understanding the linux kernel is related to virtual addresses. Based on the concept of hardware MMU and Software Memory Management, you can refer to the second chapter of UTLK memory addressing, I have a very detailed explanation. However, the

Bus Evolution First, let's talk about the evolution of the bus. PC architecture series: the development history of CPU, ram, and Io bus. This article is well written! Thank you for the author! The following content is largely from this article, which can be said to be the reduction and reproduction of this article. Public Bus