The driver reads the data from the hardware and writes the data into a buffer.īefore Windows 10, this buffer was always set to 10 ms. Here's a summary of latency in the capture path: The hardware can also process the data again in the form of more audio effects. The Audio driver reads the data from the buffer and writes them to the hardware. Starting with Windows 10, the buffer size is defined by the audio driver (more details on the buffer are described later in this article). The audio engine writes the processed data to a buffer.īefore Windows 10, the buffer was always set to ~10 ms. In Windows 10 and later, the latency has been reduced to 1.3 ms for all applications The latency of the APOs varies based on the signal processing within the APOs.īefore Windows 10, the latency of the audio engine was equal to ~12 ms for applications that use floating point data and ~6 ms for applications that use integer data For more information about APOs, see Windows audio processing objects. It also loads audio effects in the form of audio processing objects (APOs). The audio engine reads the data from the buffer and processes it. The application writes the data into a buffer Here's a summary of the latencies in the render path: The following diagram shows a simplified version of the Windows audio stack. It's equal to render latency + touch-to-app latency. It's roughly equal to render latency + capture latency.ĭelay between the time that a user taps the screen until the time that the signal is sent to the application.ĭelay between the time that a user taps the screen, the event goes to the application and a sound is heard via the speakers. Changes in WASAPI to support low latency.ĭelay between the time that an application submits a buffer of audio data to the render APIs, until the time that it's heard from the speakers.ĭelay between the time that a sound is captured from the microphone, until the time it's sent to the capture APIs that are being used by the application.ĭelay between the time that a sound is captured from the microphone, processed by the application and submitted by the application for rendering to the speakers.The new AudioGraph API for interactive and media creation scenarios.Provide a reference on how application developers and hardware manufacturers can take advantage of the new infrastructure, in order to develop applications and drivers with low audio latency.Explain the changes that reduce audio latency in the Windows 10 audio stack.Describe the sources of audio latency in Windows.Having low audio latency is important for several key scenarios, such as: Audio latency is the delay between that time that sound is created and when it's heard. It covers API options for application developers and changes in drivers that can be made to support low latency audio. This article discusses audio latency changes in Windows 10.
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