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fix effect pipeline and file length propogation

Lets fade work again when specifying a length from end of file.
Fix is based on work from Thor Andreassen.

--- a/ChangeLog

+++ b/ChangeLog

@@ -18,6 +18,8 @@

   o Added use_threads variable to sox_globals. This should be used to enable

     or disable use of parallel effects processing instead of directly calling

     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)

 sox-14.3.2	2011-02-27

 ----------

--- a/src/effects.c

+++ b/src/effects.c

@@ -143,6 +143,9 @@

         in->precision : SOX_SAMPLE_PRECISION;

   if (!(effp->handler.flags & SOX_EFF_GAIN))

     effp->out_signal.mult = in->mult;

+  if (!(effp->handler.flags & SOX_EFF_LENGTH))

+    effp->out_signal.length = in->length;

+

   effp->flows =

     (effp->handler.flags & SOX_EFF_MCHAN)? 1 : effp->in_signal.channels;