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oops effect

--- a/soxeffect.7

+++ b/soxeffect.7

@@ -543,6 +543,13 @@

 	sox noisy.au -n trim 0 1 noiseprof | play noisy.au noisered

 .EE

 .TP

+\fBoops\fR

+Out Of Phase Stereo effect.

+Mixes stereo to twin-mono where each mono channel contains the

+difference between the left and right stereo channels.

+This is sometimes known as the karaoke effect as it often has the effect

+of removing most or all of the vocals from a recording.

+.TP

 \fBpad\fR { \fIlength\fR[\fB@\fIposition\fR] }

 Pad the audio with silence, at the beginning, the end, or any

 specified points through the audio.

--- a/src/effects.h

+++ b/src/effects.h

@@ -30,6 +30,7 @@

   EFFECT(mixer)

   EFFECT(noiseprof)

   EFFECT(noisered)

+  EFFECT(oops)

   EFFECT(pad)

   EFFECT(pan)

   EFFECT(phaser)

--- a/src/mixer.c

+++ b/src/mixer.c

@@ -559,3 +559,19 @@

   handler.name = "pick";

   return &handler;

 }

+

+static int oops_getopts(sox_effect_t * effp, int n, char * * argv) 

+{

+  char * args[] = {"1,-1,-1,1"};

+  return sox_mixer_effect_fn()->getopts(effp, array_length(args), args);

+}

+

+sox_effect_handler_t const * sox_oops_effect_fn(void)

+{

+  static sox_effect_handler_t handler;

+  handler = *sox_mixer_effect_fn();

+  handler.name = "oops";

+  handler.usage = NULL;

+  handler.getopts = oops_getopts;

+  return &handler;

+}