All of the names in the selector are short and easy to read, there&#x27;s just <i>a lot</i> of them. I don&#x27;t even know what the method does or what any of the parameter types, but I can make what I&#x27;d assume is a fairly accurate guess:<p><pre><code>    outputImageProviderFromBufferWithPixelFormat:
</code></pre>
Some kind of pixel format enumeration, probably along the lines of &quot;[Class name of the receiver]PixelFormat&quot;. Also, the function probably returns an &quot;OutputImageProvider&quot;, or something like that (could be a id with a protocol associated, due to &quot;provider&quot;). This one is longer than the others, but that&#x27;s just because it contains information about what the message will return.<p><pre><code>    pixelsWide:
</code></pre>
The width of the output image in pixels, hopefully an NSUInteger (but sadly, probably an NSInteger, and Swift is only making this discrepancy worse).<p><pre><code>    pixelsHigh:
</code></pre>
Same as above.<p><pre><code>    baseAddress:
</code></pre>
A pointer to the buffer referenced.<p><pre><code>    bytesPerRow:
</code></pre>
The number of bytes per row, probably size_t?<p><pre><code>    releaseCallback:
</code></pre>
Something to call when the provider is released, probably a block? Actually, judging by the next parameter, probably a function pointer. Wow, this must be an old API!<p><pre><code>    releaseContext:
</code></pre>
An argument to pass to releaseCallback.<p><pre><code>    colorSpace:
</code></pre>
A color space value. Possibly an enumeration of RGB, HSV, etc., or a more complex type.<p><pre><code>    shouldColorMatch:
</code></pre>
While I&#x27;m not sure what color matching actually <i>is</i>, I do know that this parameter enables or disables it, and is of type BOOL.