soundmax digital audio driver

), audio interface, damp (dynamic audio power management) definition and some codec IO features. To ensure hardware independence, any platform-and machine-specific code is moved to the platform and machine drivers. All CODEC drivers are provided with the following characteristics: Codec DAI and PCM configuration information, Codec IO control (I2C,SPI, etc.), mixer and other

HP (headphone), speaker and phoneout telephone signals. In addition, you must note that there are Audio Digital Signal Input and Output between codec and CPU. 1) Play Music 2) Recording 3) telephone --- Call --- answer --- 4) call through Bluetooth --- Call --- answer --- 2. System Architecture The android audio system has a relatively standard and sound a

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

First, digital audioAudio signal is a continuous change of the analog signal, but the computer can only process and record binary digital signal, from the natural sound source audio signal must undergo a certain transformation, become a digital audio signal, can be sent to t

with and to savePower). Other master clocks is fixed at a set frequency (i.e. crystals).Some master clocks are configurable (such as PLL or processor-based clocks) that can be changed by software speed (depending on system application and power-saving considerations). Other master clocks are fixed to a specific frequency value (such as a crystal oscillator). Master Clock Driver Master Clock Configurable C

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, forcespeaker interface, and so on. (1) software implementation of the

definition drive patch kb835221 kb888111; 2. restart the computer system; 3. re-enter the soundmax installer, and the program will automatically restart the HD Audio bus program, it is completely normal in the future. Since then, the HD Audio problem has been completely solved !!! [Analysis]: it should be kb835221 kb888111. If the two patch packages do not cor

switch between different audio sources. These operations are usually not continuous, it does not occupy a large amount of computer resources like recording or playing. Because the mixed speaker operation does not conform to the typical read/write operation mode, most of the operations except open () and close () are performed through ioctl () system Call. Unlike/dev/dsp,/dev/mixer allows simultaneous access by multiple applications, and the set value

to directly call the driver layer to write the application, although it can meet the needs of the moment, but as the application needs increase, in the STB using middleware is a good solution.Application LayerThe application layer can be divided into the host application and the downloadable application two parts, the different STB Software design concept makes these two parts contain the application also not identical, the reasonable planning these

First, "Basic knowledge" 1, J2 "--hpr_out+hpl_out"--U13 (TLV320AIC3104IRHBR) hprout+hplout 2. Driving source code Ipnc_rdk_v3.8.0.1/source/ti_tools/ipnc_psp_arago/kernel/sound/soc/codecs/tlv320aic3x.c 3, depends on the I2C drive 4, sound card driver frame: ALSA (Advanced Linux Sound architecture) 5, ALSA website: http://www.alsa-project.org 6, the structure body Snd_card describes a sound card device 7, the structure body snd_device the description ch

1. Codec Introduction In mobile devices, the role of codec can be summed up to 4 kinds, respectively: For PCM and other signals D/a conversion, the digital audio signal to analog signals to the mic, LineIn or other input source analog signals for A/D conversion, the analog sound signal conversion CPU can handle digital signals to control the

, and when the name of the platform driver and platform device (previously configured in DT) wants to match, it invokes the probe function s3c24xx_uda134x_probe in the platform driver. S3c24xx_uda134x_snd_device = Platform_device_alloc ("Soc-audio",-1); if (!s3c24xx_uda134x_snd_device) { printk (kern_err "s3c24xx_uda134x SoC

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