资源说明：A collection of LADSPA plugins.

STUDIOBLOOD LADSPA PLUGIN PACKAGE
COPYRIGHT ©2009 Tyler Hayes 
ALL RIGHTS RESERVED


Each of the LADSPA plugins in this package are licensed under the GPL v3.


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                                   INTRO
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StudioBlood is a package of LADSPA plugins written in C. This API is meant to
be used to create effects mostly similar to guitar effects pedals that work
on-the-fly such as reverb, delay, phaser, flanger, chorus, or distortion.
StudioBlood, however, tries to offer more unique effects that are more along
the lines of studio tricks rather than real-time effects like an equalizer or
compressor or any of the others listed above. There are a couple of those too,
but the main purpose is to provide something that you might not find in any
other LADSPA plugin package, and that creates more abstract sounds.

Open source audio editing programs such as Ardour and Audacity that support the
LADSPA can be used to apply these effects to sound files through the created
plugins.  ladspa.org has a list of host programs that support the LADSPA.

I am still a student programmer at the time of this writing, so some of the
comments in the source code are detailed and directed at the beginner as well.
Hopefully the comments will be beneficial to those who were like me in learning
the API, and not too annoying for the pro's out there.


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                                 THE PLUGINS
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This StudioBlood release package includes these plugins:


ADT (plugin ID #4305)
---------------------
ADT stands for Artificial Double-Tracking. Abbey Road Studios technician Ken
Townsend invented this recording technique when working with The Beatles where
the recording signal is taken from the playback head, recorded onto a separate
machine with a variable oscillator, and then fed back onto the original tape to
be combined with the original signal but just slightly out of sync--like a few
milliseconds. The result is what sounds like (in vocals, for instance) two of
the same voices without having to go back and record another track. This plugin
tries to emulate ADT with one user option for variable offset length.

At this point this plugin is ONLY FOR STEREO sound files.  Not only that, but
it is intended to be used with stereo files that have just been converted from
mono (although it can be used with any stereo sound). A mono sound in stereo is
still a mono sound.  But using ADT shifts the right channel of the mono sound
just slightly (as in milliseconds). This does two things at once: creates a
panned stereo sound, and virtually double-tracks the sound.
For example, you lay down a vocal track.  Then apply ADT to it, and you
automatically have two vocal tracks (sung literally exactly the same), and
panned into full stereo.  I say it's 'virtually' double-tracked, because, of
course, it is still only one sound file, and thus, can only be one track.

Mono capabilities is planned, where the second sound that is shifted to create
the virtual second track is placed on top of the existing sound--the same way
delay and such is done.  I haven't learned yet how to do this, but will soon...


esreveR (Random Reversal) (plugin ID #4302)
-------------------------------------------
This plugin takes each block of samples sent by the host, and reverses
sub-blocks of random sizes (between 0.2 and 1.5 seconds).  Probably not much 
practical use for the average person, but more of a random effect for those like
me who like to create weird and new sounds.

IMPORTANT NOTE: this plugin does not account for left/right channels, which
means that the channels will have different results--in other words, different
radnomness.  This is cool when you want an abstract, weird, random effect like
this one, but not cool if you want each channel to be done the same, like your
standard reverb or what have you.  In the future, I hope to add a user option
for linked vs. unlinked channels.

The name esreveR is just Reverse backwards if you didn't already catch that.


Kite (plugin ID #4304)
----------------------
This plugin takes a sound sample, randomly cuts it up into pieces
of various lengths, randomly reverses some of the pieces, and glues them all
back together randomly. This is based on the circus sound effects at the end of
"Being for the Benefit of Mr. Kite!" by The Beatles, which was created by George
Martin and Geoff Emerick by literally cutting up sound effects tape, tossing
them up in the air, and splicing the pieces back together randomly.

KNOWN BUG: The plugin is supposed to vary the lengths of random sub-blocks from
0.25 seconds to 2 seconds.  However, I didn't see deep enough into my algorithm
to see that it is possible to get sub-blocks of lengths smaller than 0.25
seconds--even a sub-block of 1 sample!  To fix this would require a overhaul
of the whole algorithm and reimplementation of the run_kite() procedure.

The plugin works fine other than that and does what it's supposed to do.


Revolution (plugin ID #4301)
----------------------------
It's simple effect creates a fuzz distortion similar to that of The Beatles'
"Revolution" where, in that case, guitars were plugged directly into the
recording console and intentionally overloaded.

This was my first shot at writing a LADSPA plugin, which is why this one is so
simple.  I'm not interested in this effect for usage, because distortion effects
are a dime a dozen.  I only chose this effect to learn the API and get my feet
wet.


Ringer (plugin ID #4303)
------------------------
The results of the Ringer effect are similar to a ring modulator.  What it does
is take the first sample from the input buffer, makes a number of copies
(specified by the user from 5 to 200) to the output buffer, skips that same
amount of samples in the input buffer, and repeats until the input buffer is
exhausted.  The higher the number of copies, the more the wavefile looks like a
city skyline when you zoom in on the samples.

***

The plugins files (shared object files) all have the prefix 'sb_' to make them
easier to organize and keep track of.


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                                PLUGIN IDs
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I own plugin ID numbers:

4301 - 4340,

thanks to Richard Furse (e-mail him at ladspa@muse.demon.co.uk for your own
LADSPA plugin ID numbers).


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                            INSTALL & UNINSTALL
-------------------------------------------------------------------------------
You must have the LADSPA SDK installed first in order for these plugins to
work.  Go here to download it: http://www.ladspa.org/ladspa_sdk/download.html.

To install, first open the Makefile and make sure that the LADSPA_PATH variable
matches the directory of your system's LADSPA_PATH environment variable.  Once
that is good, run 'sudo make install'.  Of course, if you don't have root
privileges you wont be able to install.  Ask whoever the supervisor of your
system is to install for you, or, if (s)he's really nice, give you the root
password.  This will compile the source code files into shared object files and
copies them into your LADSPA_PATH directory.

Once they're there, you're good to go.  Just open your favorite audio editing
program (must be LADSPA compatible though) and the plugins should appear
wherever the effects reside in your programs interface.  In Audacity (the
program I used to test the plugins), for example, you would go to the Effects
menu, and at the bottom there should be sub-menus ("Plugins 1 to 5", for
example) for however many other plugins you have.

You can also run 'make clean' to remove the object files and shared object files
from the current directory you ran make from.

To uninstall, run 'sudo make uninstall' (again, you need root privileges for
this).


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                               REPOSITORIES
-------------------------------------------------------------------------------
You can find the repositories for each plugin at GitHub.com:

Revolution - http://github.com/tgh/Revolution
esreveR - http://github.com/tgh/esreveR
Ringer - http://github.com/tgh/Ringer
Kite - http://github.com/tgh/Kite
ADT - http://github.com/tgh/ADT


-------------------------------------------------------------------------------
                                  THANKS
-------------------------------------------------------------------------------
Thanks to:
- Bart Massey of Portland State University (http://web.cecs.pdx.edu/~bart/)
  for his direct help
- Richard Furse (http://www.muse.demon.co.uk/) for his examples
- David Benson (http://gdam.ffem.org/ladspa-doc/ladspa.html) for his
  tutorial
- Dave Phillips (http://linuxdevcenter.com/pub/a/linux/2001/02/02/ladspa.html)
  for his ladspa information

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