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On Wed, 2007-10-10 at 07:55 -0600, Steve Dibb wrote: |
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> Mart Raudsepp wrote: |
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> > On T, 2007-10-09 at 21:03 -0600, Steve Dibb wrote: |
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> >> The little lame use flag has started showing up more in local use flags, |
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> >> and all for the same purpose, MP3 support using LAME libraries. I vote |
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> >> we move it into a global use flag. Any objections, let me know. |
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> >> |
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> >> $ quse -D lame |
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> >> local:lame:media-libs/libquicktime: Support LAME mp3 encoding |
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> >> local:lame:media-libs/mlt: Support LAME mp3 encoding |
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> >> local:lame:media-sound/abcde: Support LAME mp3 encoding |
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> >> local:lame:media-sound/gnusound: Enable lame support |
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> >> local:lame:media-video/mpeg4ip: Support LAME mp3 encoding in the |
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> >> server/mp4live |
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> > |
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> > Any reason to not use something like mp3enc flag instead at that point? |
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> > mp3 USE flag is already global, and appears to mean mp3 decoding, so how |
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> > about a general mp3 encoding USE flag? I guess merging decoding and |
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> > encoding behind the same USE flag might be an option too. |
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> > |
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> |
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> Ah, I knew this question was gonna come up, should have addresed it |
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> first time around. |
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> |
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> The reason we have mp3 and lame use flag is because there is more than |
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> one mp3 encoder. In almost every case of the use flag being applied |
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> above, there is already support for another mp3 codec (ffmpeg). So, |
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> lame adds support for lame, not for mp3, which is also provided. |
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> |
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> When there is just one mp3 codec used in an ebuild, then it makes sense |
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> to use just the mp3 use flag. |
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Actually, the encode USE flag makes more sense, if encoding support is |
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optional. |
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Basically, it should be like so: |
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A is a mp3 program/library, which can do both encoding and decoding. It |
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doesn't use USE=mp3, at all, since it is solely an mp3 program. |
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Encoding support is enabled via USE=encode. |
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B is a media program/library, which can do both encoding and decoding |
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for multiple formats. It would use USE=mp3 to enable mp3 support. It |
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would use USE=encode (with mp3 support enabled) to enable mp3 encoding |
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support. |
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C is an encoder for multiple formats. It uses USE=mp3 for enabling mp3 |
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encoding. |
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D is an encoder for mp3. It uses no USE flags, since it is always a mp3 |
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encoder. |
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I'm sure I missed other cases, but you get the point. |
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-- |
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Chris Gianelloni |
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Release Engineering Strategic Lead |
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Alpha/AMD64/x86 Architecture Teams |
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Games Developer/Foundation Trustee |
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Gentoo Foundation |
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