Windows Audio Driver vs. WASAPI

Windows Audio Driver and WASAPI (Windows Audio Session API) are both audio technologies used in Windows for audio playback and recording. However, they have different purposes and characteristics.

1. Windows Audio Driver (WDM):

   • Windows Audio Driver Model (WDM) is the traditional audio driver model used in Windows.
   • It provides a standardized interface for audio hardware and allows applications to communicate with audio devices.
   • WDM drivers are typically used for consumer-grade audio devices like sound cards and USB audio interfaces.
   • WDM drivers offer good compatibility with older applications and operating systems.

2. WASAPI (Windows Audio Session API):

   • WASAPI is a newer and more advanced audio API introduced in Windows Vista and later versions.
   • It provides low-latency and high-performance audio streaming capabilities.
   • WASAPI supports two modes of operation: Shared mode and Exclusive mode.
     • Shared mode allows multiple applications to share a single audio endpoint and perform format conversion if needed.
     • Exclusive mode grants exclusive access to an audio endpoint, bypassing the system mixer and enabling direct access to the audio hardware.
   • WASAPI is commonly used in professional audio applications, multimedia applications, and games that require precise control over audio.

In summary, Windows Audio Driver (WDM) is the traditional audio driver model used in Windows, while WASAPI is a more modern and advanced audio API. WASAPI provides low-latency audio streaming and offers greater control and flexibility for audio applications. However, the choice between using Windows Audio Driver or WASAPI depends on the specific requirements of your application and the capabilities of the audio hardware you are working with.