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Enable --plot for the biquad effect

--- a/ChangeLog

+++ b/ChangeLog

@@ -26,6 +26,13 @@

     omp_set_num_threads. (Doug Cook)

   o Fix to effects pipeline to let fade affect specify time from end of

     file again. (cbagwell and Thor Andreassen)

+  o Fix man page default error for splice effect. (Ulrich Klauer)

+  o Enable support for -plot option on biquad effect. (Ulrich Klauer)

+

+Misc:

+

+  o Fixed man page description for unsigned samples and change

+    CVS to git references. (Ulrich Klauer)

 sox-14.3.2	2011-02-27

 ----------

--- a/sox.1

+++ b/sox.1

@@ -1633,6 +1633,8 @@

 the numerator and denominator coefficients respectively.

 .SP

 See http://en.wikipedia.org/wiki/Digital_biquad_filter (where a0 = 1).

+.SP

+This effect supports the \fB\-\-plot\fR global option.

 .TP

 \fBchannels \fICHANNELS\fR

 Invoke a simple algorithm to change the number of channels in

--- a/src/biquad.c

+++ b/src/biquad.c

@@ -152,7 +152,7 @@

 {

   static sox_effect_handler_t handler = {

     "biquad", "b0 b1 b2 a0 a1 a2", 0,

-    create, start, lsx_biquad_flow, NULL, NULL, NULL, sizeof(priv_t)

+    create, lsx_biquad_start, lsx_biquad_flow, NULL, NULL, NULL, sizeof(priv_t)

   };

   return &handler;

 }