audio interface with asio driver

User: $ Su- Step 2: Change the running level to enter the character interface: # Init 3 Step 3: CD to the driver directory ./Ati-driver-installer-10-12-x86.x86_64.run # Run the Driver Installation Package Follow the prompts Step 4: After the installation is complete, use shutdown-R now to restart the system. No con

From: http://blog.chinaunix.net/uid-22917448-id-1765508.html ASoC Machine Driver ASoC machine driver============================== The ASoC machine (or board) driver is the code that glues together the platformAnd codec drivers.ASoC machines or board-level drivers are code that binds the platform and decoder drivers together. The machine

,s3cxxxx,omapxxx and so on, and audio-related usually contains the clock in the SOC, DMA, I2S, PCM and so on, as long as the designation of the SOC, Then we can think that it will have a corresponding platform, it is only related to the SOC, and machine, so we can abstract platform, so that the same SOC do not make any changes, can be used in different machine. In fact, it's better to think of platform as a certain soc. codec literal meaning is codec,

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 behalf of compiler creator, such as: FSL for Fre

The audio driver is implemented in the wavedev2 mode. This is a single-layer driver mode, and all platform-related functions are implemented in hwctxt. H and hwctxt. in CPP, it also includes MIDI support, software mixer support, S/pdif interface, gain class interface, forces

.cbdstlengthused; When the source signal is 8 K sampling, 16 bits PCM encoding, single channel, and a wave audio signal with a length of 1 second, the driver uses the truespeech audio codec that comes with Windows 98, it can achieve a compression rate of about, which is quite satisfactory. 　　Summary: This article takes truespeech codec as an example to intr

1 PCM InterfaceFor different digital audio subsystems, there are several microprocessor or interfaces used for digital conversion between DSP and audio devices. The simplest audio interface is the PCM (pulse Coding Modulation) interface, which consists of Clock Pulse (bclk),

/recording mode) to the hardware abstraction layer Alsahal complete. The abstraction layer can invoke the local standard interface, such as Masladevice->route, or call the Alsa-lib library directly to manipulate the underlying driver. Linux's audio drive structure is relatively complex, the source code is located in the kernel directory of the/sound/soc/, where

executed by the functions in the MDD layer, the integrated driver can be simpler and more effective. The source code of any sample driver can be used as the basis for implementation, whether to implement a hierarchical driver or an integral driver. For more information, see Windows CE Drivers|

is better than ALSA in terms of hardware adaptation, and it supports more sound card categories. Although ALSA is not widely used as OSS, it has more friendly programming interfaces and is fully compatible with OSS. It is undoubtedly a better choice for application programmers. Iii. Linux OSS audio device driver 3.1 composition of OSS driver The OSS standard has

. The two-channel, also known as stereo, has two lines in the hardware, with better sound quality and timbre than mono, but the amount of storage space occupied by digitizing is one-fold more than mono.Second, sound card driverFor security reasons, applications under Linux cannot operate directly on a hardware device such as a sound card, but must pass through a kernel-supplied driver to complete it. The essence of

://blog.csdn.net/droidphone Original, reproduced please indicate the source, thank you./*****************************************************************************************************/ The most important data structures for codec in 2. asoc Describe codec are: SND_SOC_CODEC,SND_SOC_CODEC_DRIVER,SND_SOC_ Dai,snd_soc_dai_driver, where the Snd_soc_dai and Snd_soc_dai_driver are also used in ASOC platform drive, platform and codec's Dai through Snd_soc_dai _link structure that binds the con

1. the role of the platform driver in ASOC has been described in the previous chapters. ASOC is divided into three parts: machine, platform, and CODEC. The main role of the platform driver is to manage audio data, finally, the audio data is transmitted to codec through the digital