[: Re: [vorbis-dev] [fwd] CVS: ogg123 rocks! vcut no so much so... (from: wayfarer42@postmaster.co.uk)]

[Kenneth C. Arnold]

For some reason this didn't make the list and I got no approval
message... this time I'll force the From to be my subscribed
address. Bug in Monty's new filtering system? Anyway, here goes again.

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Date: Thu, 1 Aug 2002 10:24:46 -0400
To: vorbis-dev at xiph.org
Subject: Re: [vorbis-dev] [fwd] CVS:  ogg123 rocks!  vcut no so much so... (from: wayfarer42 at postmaster.co.uk)
Message-ID: <20020801142446.GA11307 at arnoldnet.net>
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On Thu, Aug 01, 2002 at 12:41:52PM +0300, Beni Cherniavksy wrote:
> As Segher once pointed out, unix tools need no playlist support:
> ogg123 `cat playlist` does the job (unless you spaces in file names, I wonder
> why bash has no split-by-lines command substitution variant...).  Using
> ls, find, vorbiscomment instead of cat you can have dynamic playlists windows
> users don't even dream of...
[...] 
> That would be broken, it would mean the -@ treats all rememaining arguments
> as playlists.  ogg123 `for f in *.m3u; do echo -@ $f; done` will produce the
> needed command line.  But in the spirit of Segher's idea, ogg123 `cat *.m3u`
> should work (modulo spaces, again) and ogg123 -@ <(cat *.m3u) is good too
> (bash has this nifty temporal named pipe feature, don't know for other shells).
[...]
> Again, ogg123 `ls *.ogg` or ogg123 `find -name '*.ogg' | sort` should do.
> "A program should do one thing and do it well."

Ah, the wonder of Unix. The -print0, -0, and -z below all do the same
thing--end filenames with '\0' instead of '\n' or ' '. The tr command
makes newlines into '\0' for playlists that delimit by newline.
Everything should be standard for any Unix system and should run in
any POSIX-compliant shell (if not, yell at me):

1. All oggs under '.', unsorted:
   find . -name '*.ogg' -print0 | xargs -0 ogg123
2. All oggs under '.', sorted by name:
   find . -name '*.ogg' -print0 | sort -z | xargs -0 ogg123
3. All oggs under '.', sorted by starting number
   find . -name '*.ogg' -print0 | sort -z -n | xargs -0 ogg123
4. Playlist, unsorted (m3u format):
   tr "\n" "\0" < ${PLAYLIST} | xargs -0 ogg123
5. Playlist, unsorted (m3u format), oggs only:
   grep ogg < ${PLAYLIST} | tr "\n" "\0" | xargs -0 ogg123
6. Playlist, unsorted (pls format):
   grep 'File\([0-9]\+\)=' < ${PLAYLIST} | cut -d '=' -f 2- | tr "\n" "\0" | xargs -0 ogg123

There's certainly more, but I think that should satisfy the
cut-and-paste needs of most of the command line Unix Ogg-ers out
there. None of these are fully tested, so you might have to tweak one
thing or another.

Oh, one more:

7. Search for a comment among files in a playlist (rather slow)
   (while read filename; do if vorbiscomment -l "$filename" | grep ${SEARCHSTRING}; then echo "$filename"; ogg123 "$filename"; fi; done) < ${PLAYLIST}

<p>
-- 
Kenneth Arnold <ken at arnoldnet.net>
- "Know thyself."

<p><p>----- End forwarded message -----


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