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Actual buffer size depends on sample rate (macOS)

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评估

难度
4/5
预计耗时
3-5 天
新手友好度
35/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
停滞
技术栈
rust

调研方向

The report identifies the CoreAudio backend on macOS and gives a reproducible buffer-size relationship, but names no files or tests. Start by locating the CoreAudio stream setup and the callback buffer sizing logic, then inspect how requested sample rates and buffer sizes are passed through. Done means the callback buffer matches the requested size across sample rates; verify with input and output streams using the reported 64-frame request at 48 kHz.

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描述

host - coreaudio platform - macos

This problem is specific to the CoreAudio backend on macOS.

The actual buffer size differs from requested buffer depending on requested sample rate.

Using the built-in sound card on an MBP, the requested buffer size X is only observed as the actual buffer size Y in the callbacks when running at SR 44.1kHz. When requesting other sample rates, the relation seems to be that observed buffer size, Y appears as Y = ceil(X*SR/44.1).

For example, requesting X=64, SR=48000 yields Y=70.

In other words, the observed behaviour is almost as if the requested buffer size is in the native sample rate domain rather than in the domain of the requested sample rate.

The expected result would be that the requested buffer size is also in the domain of the requested sample rate.

In the test, I have both input- and output streams running with the same requested configuration.

Env: MBP 14.3 (2017), macOS 11.0.1

主要语言
Rust
星标
4k
派生
554
平均合并
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