linux音频alsauda134x驱动分析之十二
ASoC Machine Driver [color="Red"]ASoC机器驱动 =================== The ASoC machine (or board) driver is the code that glues together the platform and codec drivers. [color="Red"]ASoC机器或板级驱动是把平台和解码器驱动粘合在一起的代码。 The machine driver can contain codec and platform specific code. It registers the audio subsystem with the kernel as a platform device and is represented by the foll...
by dean_go - Linux文档专区 - 2009-11-23 11:10:48 阅读（1056） 回复（0）
ASoC Platform Driver [color="Red"]ASoC平台驱动 ==================== An ASoC platform driver can be divided into audio DMA and SoC DAI configuration and control. The platform drivers only target the SoC CPU and must have no board specific code. [color="Red"]一个ASoC平台驱动可以分为音频DAM和SoC DAI配置和控制。平台驱动只锁定平台处理器为目标，必须不包含任何板级相关代码。 Audio DMA [color="Red"]音频DMA...
ASoC jack detection [color="Red"]ASoC插口探测 =================== ALSA has a standard API for representing physical jacks to user space, the kernel side of which can be seen in include/sound/jack.h. ASoC provides a version of this API adding two additional features: [color="Red"]ALSA对标准的API用以向用户空间提供物理插口，内核层面上的API可见于include/sound/jack.h.ASoC提供的这种API的一个版本增加了两...
[Ubuntu] linux音频alsa-uda134x驱动分析之三（解码器) 解码器 , 音频 , linux , 驱动 ASoC Codec Driver[color="Red"]ASoC解码器驱动=================The codec driver is generic and hardware independent code that configures thecodec to provide audio capture and playback. It should contain no code that isspecific to the target platform or machine. All platform and machine specificcode should be added ...
Audio Clocking[color="Red"]音频时钟==============This text describes the audio clocking terms in ASoC and digital audio ingeneral. Note: Audio clocking can be complex![color="Red"]本文本总体描述ASoC和数字音频中的音频时钟条款。[color="#FF0000"]Note：Audio Clock 是一个很复杂的东东Master Clock[color="Red"]主时钟------------Every audio subsystem is driven by a master clock (sometimes referred to as MC...
[color="Green"]前言目前，linux系统常用的音频驱动有两种形式:alsa oss [color="Green"]alsa:现在是linux下音频驱动的主要形式，与简单的oss兼容。[color="Green"]oss：过去的形式[color="Green"]而我们板子上的uda1341用的就是alsa驱动。alsa概述：因为我们用的是片上系统，用的也是alsa 的一个soc子系统。所以我们直接讲解alsa soc子系统。ALSA SoC Layer[color="Red"]ALSA板上系统层==============The overall project go...
Dynamic Audio Power Management for Portable Devices [color="Red"]便携设备的动态音频电源管理 =================================================== 1. Description [color="Red"]1、概述 ============== Dynamic Audio Power Management (DAPM) is designed to allow portable linux devices to use the minimum amount of power within the audio subsystem at all times. It is independent of other kernel PM and as suc...
ASoC currently supports the three main Digital Audio Interfaces (DAI) found on SoC controllers and portable audio CODECs today, namely AC97, I2S and PCM. [color="Red"]ASoC现在支持如今的SoC控制器和便携音频解码器上的三个主要数字音频接口，即AC97，I2S，PCM。 AC97 [color="Red"]AC97 ==== AC97 is a five wire interface commonly found on many PC sound cards. It is now also popular in many portable device...
linux音频驱动分析 creator sz111@126.com int __init utu2440_uda1341_init(void) { int ret = 0; //printk("ghcstop.........probe\n"); //首先是对L3总线的一些控制操作。 ret = l3_attach_client(&uda1341, "l3-bit-24x0-gpio", "uda1341"); if (ret) { printk("l3_attach_client() failed.\n"); return ret; } l3_open(&uda1341); start_uda1341(); //定义输出和输...
linux音频驱动分析 creator sz111@126.com int __init utu2440_uda1341_init(void) { int ret = 0; //printk("ghcstop.........probe\n"); //首先是对L3总线的一些控制操作。 ret = l3_attach_client(&uda1341, "l3-bit-24x0-gpio", "uda1341"); if (ret) { printk("l3_attach_client() failed.\n"); return ret; } l3_open(&uda1341); start_uda1341(); //定义输出和输...
Audio Pops and Clicks [color="Red"]音频咔咔声 ===================== Pops and clicks are unwanted audio artifacts caused by the powering up and down of components within the audio subsystem. This is noticeable on PCs when an audio module is either loaded or unloaded (at module load time the sound card is powered up and causes a popping noise on the speakers). [color="Red"]咔咔声是因为音频子系统中的...
