Linux Audio for Android.pdf

发布时间：2022-06-21 发布人：admin 分类：说明书资料大小：0.68M 资料格式：pdf 举报版权申诉

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Overview • Android audio stack overview • Modern smartphone audio subsystems • Traditional solutions • ASoC – the Linux solution • Design overview • Brief introduction to chip drivers • Walk through of system audio driver construction • Debugging tips • Future directions 2 © 2011 Wolfson Microelectronics plc April 2011 www.wolfsonmicro.com

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 7 © 2011 Wolfson Microelectronics plc April 2011 www.wolfsonmicro.com

The Linux solution • ASoC embedded audio framework • Merged since 2.6.21, April 2007 • 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 management • More reuse, less coupling 8 © 2011 Wolfson Microelectronics plc April 2011 www.wolfsonmicro.com

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