January 2021
Intermediate to advanced
646 pages
13h 48m
English
Content preview from Mastering Linux Device Driver Development
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Chapter 5: ALSA SoC Framework – Leveraging Codec and Platform Class Drivers
Audio is an analog phenomenon that can be produced in all sorts of ways. Voice and audio have been communication media since the beginning of humanity. Almost every kernel provides audio support to userspace applications as an interaction mechanism between computers and humans. To achieve this, the Linux kernel provides a set of APIs known as ALSA, which stands for Advanced Linux Sound Architecture.
ALSA was designed for desktop computers, not taking into account embedded world constraints. This added a lot of drawbacks when it came to dealing with embedded devices, such as the following:
- Strong coupling between codec and CPU code, leading to difficulties in porting ...