flac dev - Jan 2007 - METADATA_BLOCK_PICTURE question

Hi everybody,

I have a question about the following part of the METADATA_BLOCK_PICTURE
specification. The components: Width, Height, Color Depth, and Colors
Used don't provide an "unknown" value and seem to assume that the
program encoding the METADATA_BLOCK will be aware of these components of
the file.

As these fields seem to just provide "extra" information (I'm
assuming
it's there to provide a decoder with information about the environment
in which the pictures were encoded) that is unnecessary for the display
of the images, could a value like 0 or -1 to indicate that the value
isn't provided?

Thanks,
Brian Nickel
TagLib# Lead Developer
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--- Brian Nickel <brian.nickel@gmail.com> wrote:
> Hi everybody,
> 
> I have a question about the following part of the
> METADATA_BLOCK_PICTURE
> specification. The components: Width, Height, Color Depth, and Colors
> Used don't provide an "unknown" value and seem to assume that
the
> program encoding the METADATA_BLOCK will be aware of these components
> of
> the file.
> 
> As these fields seem to just provide "extra" information (I'm
> assuming
> it's there to provide a decoder with information about the
> environment
> in which the pictures were encoded) that is unnecessary for the
> display
> of the images, could a value like 0 or -1 to indicate that the value
> isn't provided?
the width/height/depth can be 0 for unknown (I'll add that to the
docs) but they should be filled in if at all possible because some
devices may have display constraints and have to choose from
multiple pictures one that they can display.

also, if one of width/height/depth is 0, they should all be.

Josh


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