用于访问类似于 Quicktime 原子或 MPEG 盒的数据结构的 OSX API

发布于 2024-08-05 22:36:10 字数 514 浏览 7 评论 0原文

Quicktime、MPEG 或 AIFF 文件似乎都将其数据元素组织成这样的块：

0x00 chunk 1 header (size as UInt32 + ID as 4-char-code)
0x08 chunk 1 data
...
0xA0 chunk 2 header
0xA8 chunk 2 data
...
and so on.

当读取这样的文件时，很容易跳到感兴趣的块，因为每个块都声明它自己的大小。当然，块也可以嵌套。

在 Quicktime 世界中，这些块被称为“原子”，在 MPEG 中，它们被称为“盒子”。

我的问题： Mac OSX 中是否有某种通用 API 来导航和访问这些块？我知道它很容易实现，但我宁愿使用正确的东西，也不愿自己将其组合在一起。

另外，我很好奇这种数据结构是否有一个除了“原子”或“盒子”之外的通用名称。对我来说，它看起来如此简单和有用，它一定存在于除了 Quicktime 或 MPEG 之外的许多其他领域。

谢谢，塞巴斯蒂安

原文

Quicktime-, MPEG- or AIFF-files all seem to organize their data elements in chunks like this:

0x00 chunk 1 header (size as UInt32 + ID as 4-char-code)
0x08 chunk 1 data
...
0xA0 chunk 2 header
0xA8 chunk 2 data
...
and so on.

When reading a file like that, it's easy to skip to the chunk of interest, because each chunk declares it's own size. Of course, chunks can also be nested.

In the Quicktime world these chunks are called 'Atoms', in MPEG they're called 'Boxes'.

My question:
Is there some kind of common API in Mac OSX to navigate and access these chunks? I know it's fairly easy to implement, but I'd rather use something proper than hacking it together myself.

Also, I'm curious if this kind of data structure has a common name other that 'Atoms' or 'Boxes'. To me it seems so simple and useful, it must exist in many other fields besides Quicktime or MPEG.

Thanks,
Sebastian

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