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Valid `AudioEncoderConfig` algorithm for unsupported codecs with codec-specific steps

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难度
5/5
预计耗时
一周以上
新手友好度
25/100
Issue 类型
缺陷
描述清晰度
需要澄清
活跃度
停滞
技术栈
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调研方向

先从有效的 AudioEncoderConfig 算法和 configure() 处理步骤开始,然后审查 codec registry 的要求以及相关 issue #861 和 #826。确定规范应如何处理对不支持的 codec 进行的特定于 codec 的验证;当规范性行为得到解决并清晰地反映在 WebCodecs 规范中时,该 issue 即完成。

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描述

The algorithm that checks whether an object is a valid AudioEncoderConfig asks user agents to run possible codec-specific validation steps defined in the registrations listed in the registry. That seems wrong:

  1. User agents can choose the codecs they support, it seems strange to ask them to implement validation steps for codecs they chose not to support. For example, when an application calls configure() with an invalid config for a codec that is not supported by a user agent (either because the user agent decided not to support it or because the codec was added to the registry recently), the spec still requires that the user agent know about any codec-specific extension, run possible validation steps defined in the underlying registration document, and throw a TypeError if the configuration is invalid. How can the user agent know anything about a codec it does not (want to) know anything about?
  2. A registry is meant to be completed over time, even when it's stable. That's its purpose. Normative algorithms cannot set requirements over such a moving target (also see Specifications that reference registries in the W3C Process). If we expect user agents to implement extra validation steps, they should be integrated into the WebCodecs specification itself.

(Noting #861 and #826 as open issues somewhat related to this)

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