shithub: sox

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vol is really annoying, as unlike every other effect, it doesn't use dBs
by default

--- a/src/effects.h

+++ b/src/effects.h

@@ -17,6 +17,7 @@

   EFFECT(fade)

   EFFECT(filter)

   EFFECT(flanger)

+  EFFECT(gain)

   EFFECT(highpass)

   EFFECT(key)

 #ifdef HAVE_LADSPA_H

--- a/src/vol.c

+++ b/src/vol.c

@@ -183,3 +183,23 @@

   };

   return &handler;

 }

+

+static int gain_getopts(sox_effect_t * effp, int argc, char * * argv) 

+{

+  char * args[] = {0, "dB"};

+

+  if (argc != 1)

+    return sox_usage(effp);

+  args[0] = argv[0];

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

+}

+

+sox_effect_handler_t const * sox_gain_effect_fn(void)

+{

+  static sox_effect_handler_t handler;

+  handler = *sox_vol_effect_fn();

+  handler.name = "gain";

+  handler.usage = "dB-gain";

+  handler.getopts = gain_getopts;

+  return &handler;

+}