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Author:Cpuwolf Reprinted: http://blog.csdn.net/cpuwolf/article/details/4686830 There are very few Chinese materials about ALSA (Advanced Linux sound architecture), probably because few Chinese people have started driving development from scratch. After all, companies like Wolfson and RealTek are mostly engaged in development by foreigners. ALSA's support for SOC is more of an application of ALSA in the emb
Author: Ren chengming,Hua Qing vision embedded college lecturer. 1. Download the library required by ALSA and test tool for ALSA.ALSA-Lib-1.0.24.1.tar.bz2w.alsa-utils-1.0.24.2.tar.bz2. 2. By default, the kernel already supports the Alsa driver. in the case of insurance, check the kernel first, for example:Device Drivers --->Sound Card support --->Advanced Linux sound Architecture --->
Linux ALSA Audio Driver Six: machine in ASOC architecture As we mentioned in the previous section, ASOC is divided into machine, platform and codec, where the machine drive is responsible for coupling between platform and codec as well as parts and equipment or board-specific code, Again, refer to the previous section: The machine driver is responsible for handling some of the machine-specific controls and audio events (for example, when audio is pla
Preface: In Linux, the data streams of recording and playing must be clearly analyzed in both OSS and ALSA systems. Analyze the Alsa driver layer and associate it with the Alsa library layer and application layer. Link Analysis: In the core/pcm_native.c file. MMAP = snd_pcm_mmap call snd_pcm_mmap_data (substream, file, area); Further call substream-> OPS-> MMAP
ALSA is a Linux advanced audio interface. ALSA provides a set of standard access mechanisms for Linux audio developers to easily develop audio devices. Believe it? Next we will use it to compile a simple recording/broadcasting program, but this requires you to have a certain degree of computer language basics. A typical audio program should have the following structure: Enable the audio device Set read/writ
Label: Linux audio ALSA lib versioned_symbols Problems with porting ALSA-lib Linux audio ALSA lib versioned_symbols During the migration of ALSA Lib in the past two days, I encountered a problem and was stuck for a long time.Make a record and be trapped by the same problem later. The problem is that there is a
microcomputer to execute each statement time is very certain, is 1us is 1us not a little bit less.The following is the 51 single-chip bus extension: This structure is the three-bus structure mentioned in the previous article, as shown in the figure1. Data bus51 MCU data bus is P0 port, the CPU is sent from P0 port and read back data.2. Address busThe address
devices. Of course also to implement the connection platform and codec dai_link corresponding OPS implementation, this example is smdk_ops, it only implements the Hw_params function: Smdk_hw_params.2. Registered Platform Driver According to the model of Linux equipment, there are platform_device, there must be platform_driver. ASOC's platform_driver is defined in the following file: Sound/soc/soc-core.c. Or start at the entrance of the module: [CPP] view plain copy static int __init snd_soc_ini
ASOC (ALSA system on Chip)//The Sound management architecture specifically developed for embedded systems [Luther.gliethttp].Digital Audio Interface (DAI) types/* SoC Machine * *struct Snd_soc_machine {//Snd_soc_machine set CPU internal audio control logic and CPU external audio decoder chip communication logic in one [Luther.gliethttp]....//audio machine driver represents the audio device structure, my ep9312 as a ARM-SOC chip,Is the machine here, a
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1. IntroductionSpring Cloud Bus connects the distributed nodes with a lightweight message broker. It can be used to broadcast configuration file changes or communication between services, and can also be used for monitoring. This article is about changes to the configuration file that notifies the MicroServices architecture with spring Cloud bus. spring cloud bus
Spring Cloud Bus connects the distributed nodes with a lightweight message broker. It can be used to broadcast configuration file changes or communication between services, and can also be used for monitoring. This article is about changes to the configuration file that notifies the MicroServices architecture with spring Cloud bus.First, the preparatory workThis article is also based on the previous article to achieve. According to the official docume
Original address http://www.alsa-project.org/main/index.php/Asoundrc Why asoundrc? . Asoundrc and asound. conf are not necessary for ALSA to work properly. Most applications can run normally without them. These two files are used to provide specific additional functions, such as routing and sampling rate conversion on the Alsa-lig layer. The. asoundrc File This file provides you with more advanced control
2015-10-10 18:42:55Original Libmad is an open source MP3 decoding library, lightweight and efficient, MPlayer also use this library to decode MP3. ALSA (Advanced Linux Sound architecture) is a kernel component in Linux that provides voice device drivers to replace the original open sound system (open Sound system,ossv3). In addition to sound device drivers, ALSA also contains a library of user-space functio
Tags: Porter accept Task Usage WiFi tools host struct returnWork has been completed, first on the source:Https://files.cnblogs.com/files/qzrzq1/WIFISpeaker.zipThe full text contains three articles, this is the third chapter, mainly on the receiving end program principles and procedures.First article: Implement WiFi Wireless speaker based on Orangpi Zero and Linux alsa (i)Second article: Based on ORANGPI Zero and Linux
Reference http://blog.csdn.net/lanmanck/article/details/5829143Http://dev.hqyj.com/column/column3.htm1.TAR-XVF alsa-lib_1.0.23.orig.tar.bz2./configure--host=arm-linux--prefix=/home/alsa/alsa_libMakeMake installGenerated librariesalsa_lib$ lsBin include Lib ShareIn this file lib under the library *.so.* is to be published to the board, you can directly copy to the Development Board under the root directory L
1. Export ALSA installation directory Export Gliethttp_alsa_lib=/usr/local/alsa mkdir $gliethttp _alsa_lib sudo chown luther:luther $gliethttp _alsa_lib-r 2. Compile Alsa-lib Library ./configure--build=i386--host=arm-linux--disable-python--prefix= $gliethttp _alsa_lib Make;make Install 3. Compile Alsa-utils ./configure
ALSA driver Debian sound card-Linux Release Technology-Debian information. The following is a detailed description. When I first used Debian, I did not pay close attention to the Linux sound card driver. Although I knew in the Early Days that ALSA was a very good sound card driver, however, since the installation and usage experience has been relatively smooth, we have not installed this to drive the sound
;id.name)))continue;if (kctl->id.index > id->index)continue;if (kctl->id.index + kctl->count When we continue to track the android audio system today, we find that no matter what the connection between Android and snd_kcontrol is found, whether it is the name or numid (numid printed by alsa_amixer controls, that is, the numid of the snd_kcontrol linked list element in the kernel layer. However, it can be used to adjust the volume. Later, I modified the codec driver of the kernel, changed the k
; index)Continue;If (kctl-> id. index + kctl-> count Continue;Return kctl;}Return NULL;} When we continue to track the Android audio system today, we find that no matter what the connection between Android and snd_kcontrol is found, whether it is the name or numid (numid printed by alsa_amixer controls, that is, the numid of the snd_kcontrol linked list element in the kernel layer. However, it can be used to adjust the volume. Later, I modified the Codec driver of the kernel, changed the kcontro
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