WASAPI has two significant benefits for Audacity.Ģ4-bit recording is supported (Windows DirectSound supports 24-bit recording, but the PortAudio API Audacity uses does not support 24-bit input under DirectSound).įrom version 2.0.4 onwards, Audacity supports recording computer playback (even where sound devices do not support this) using [ Windows WASAPI loopback recording. This is a necessary step for modern battery-dependent devices where software audio processing on the CPU would rapidly deplete battery life. To compensate for this, [ Windows Store applications on Windows 8 can support offloading of audio processing to hardware which was dropped with Vista. Latencies under WASAPI are higher than under WDM-KS because MME and DirectSound are both emulated over WASAPI. On the other hand, direct hardware access under WASAPI is limited to a WaveRT driver which only a few built-in devices support (also, Audacity and many other audio programs do not support it). WASAPI isolates audio more from the kernel so providing greater stability, allows a few further multi-channel devices to work without ASIO and provides lower latency than MME and Windows DirectSound. "WASAPI: In 2005 the WASAPI application programming interface (API) was introduced starting with Windows Vista. Click to expand.Please post a link to such an interface.
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