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Remove deprecated PLAY_RATE_ARG environment variable

--- a/ChangeLog

+++ b/ChangeLog

@@ -15,6 +15,7 @@

   14.3.0   O --interactive         --no-clobber

   14.3.0   E filter                ~=sinc

   14.3.0   E norm -b, norm -i      gain -B, gain -en

+  14.3.0   PLAY_RATE_ARG           SOX_OPTS

   14.2.0   E key alias             pitch

   14.2.0   E pan                   ~= mixer/remix

   14.1.0   E resample alias        rate

@@ -29,7 +30,6 @@

   14.3.1   F mp3: lame 3.97        lame > 3.97             14.3.2

   14.3.1   F sndfile: sndfile 1.0.11 sndfile > 1.0.11      14.3.1

   14.3.0   F flac: libFLAC 1.1.2,3 libFLAC > 1.1.3         14.3.1

-  14.3.0   PLAY_RATE_ARG           SOX_OPTS                (now)

   14.3.0   O -1/-2/-3/-4/-8        -b                      14.4.0

   14.3.0   O -s/-u/-f              -e                      14.4.0

   14.3.0   O -A/-U/-o/-i/-a/-g     -e                      14.4.0

--- a/sox.1

+++ b/sox.1

@@ -740,7 +740,7 @@

 SoX's global options.

 For example:

 .EX

-   SOX_OPTS="\-\-buffer 20000 \-\-play-rate-arg \-hs \-\-temp /mnt/temp"

+   SOX_OPTS="\-\-buffer 20000 \-\-play\-rate\-arg \-hs \-\-temp /mnt/temp"

 .EE

 Note that setting SOX_OPTS can potentially create unwanted changes in

 the behaviour of scripts or other programs that invoke SoX.  SOX_OPTS

@@ -2664,7 +2664,8 @@

 .I Rej dB

 is the level of noise rejection.  Increasing levels of resampling

 quality come at the expense of increasing amounts of time to process the

-audio.  If no quality option is given, the quality level used is `high'.

+audio.  If no quality option is given, the quality level used is `high'

+(but see `Playing & Recording Audio' above regarding playback).

 .SP

 The `quick' algorithm uses cubic interpolation; all others use

 band-limited interpolation.  By default, all algorithms have

--- a/src/sox.c

+++ b/src/sox.c

@@ -988,8 +988,7 @@

   int guard = is_guarded - 1;

   unsigned i;

   sox_effect_t * effp;

-  char * rate_arg = is_player ? play_rate_arg ? play_rate_arg :

-      (rate_arg = getenv("PLAY_RATE_ARG")) ? rate_arg : "-l" : NULL;

+  char * rate_arg = is_player ? (play_rate_arg ? play_rate_arg : "-l") : NULL;

   /* 1st `effect' in the chain is the input combiner_signal.

    * add it only if its not there from a previous run.  */