Linux Audio for Androidwolfson公司音频芯片的ppt介绍，将音频开发的大

文件名称: Linux Audio for Android

所属分类: Android

开发工具:

文件大小: 627kb

下载次数: 0

上传时间: 2020-09-05

提供者: lemon******

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详细说明：wolfson公司音频芯片的ppt介绍，将音频开发的大致流程和关键点都写出来了，新手值得一看。V. wolfson Android audio stack Applications MediaPlayer Media Recorder Audio Flinger iaudio 32011 Wolfson Microelectronics plc April2011www.wolfsonmicro.com V. wolfson Modern smartphone audio subsystems HDM CPU Earpiece Speaker Mixing DSP Headset Dock Cellular Bluetooth modem 4 2011 Wolfson Microelectronics plc April2011www.wolfsonmicro.com V. wolfson Flexibility and complexity zua Lrm l t H LD1 CHARGE PUMP CB INlLNO 一IN2 LNDMICDAT1 CHPOUT1L IN2LPVRXP IN1RNO oHPOUT1R INIRP t-IN2RNDMICDAT2 HI HEADPHONE HPOUT1FB RIVERS IN2RPNRXNO 4 Digital MIC CHPOUT2P POUT2N → Channels E ERVER CUTPL ANALOGUE PKOUTLP ARc MULTHCHANNEL DIGITA MIXER dSPKOUTLN INTERFACE ADCL H FILTERS MIXING osPKOUTRP MPUT JsPKOUTRN MERS RrTurcMabik LOUDSPEAKER P限 AMIETRKC EQUALISE FILTERE DRTERS VOLIME 口 FNAMIC RANGE COONTROL VCLUME凵DAc LINEOUT1P RECORD CD STEREO EXPYNSICN 4 MIC OLINEOUTIN DMICDAT1 DIGITAL MIG CHANNELS HIGH ASYNCHRONOU DMICDAT2 PASS R八 TE CONVERS|N NTERFAGE QLINEOUT2P DMICCLKO4 FILT-R5 DLINEOUT2N MICDET ACCESSORY MIC AcUNy derect GPiO RECORD DETECT LINE CRIERS LINEOUTFB MICBIAS10* FLL1 12S/PCM#1 12SPCM #2 12S/PCM#3 INTERFACE MICBIAS2O+ 5 02011 Wolfson Microelectronics plc April2011www.wolfsonmicro.com V. wolfson Traditional driver model Memory Processing Analogue 6 O2011 Wolfson Microelectronics plo April2011www.wolfsonmicro.com V. wolfson Traditional driver model Monolithic driver for each card No structure for managing off-CPU hardware Very little reuse Tight coupling between application and kernel code Per-use case register settings Detailed register level knowledge of components Time consuming 72011 Wolfson Microelectronics plc April2011www.wolfsonmicro.com V. wolfson The Linux solution ASoC embedded audio framework Merged since 2.6.21, April 2007 e Provides standard aLSA interface to applications Reusable drivers for each chip Minimal per-system drivers Use case configuration done by userspace Automatic and transparent power man

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