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repeat: support infinite repetition

The special argument "-" to repeat will cause it to repeat the audio
forever. This can be combined with trim or used interactively.

--- a/ChangeLog

+++ b/ChangeLog

@@ -33,6 +33,7 @@

   o Allow mixing time and sample-count arguments for the delay

     effect, and for spectrogram -S and -d. (Ulrich Klauer)

   o Support multi-channel LADSPA plugins. (Eric Wong)

+  o Support infinite repetition with repeat. (Ulrich Klauer)

 Other new features:

--- a/sox.1

+++ b/sox.1

@@ -2918,8 +2918,9 @@

 .SP

 See also the \fBswap\fR effect.

 .TP

-\fBrepeat\fR [\fIcount\fR (1)]

+\fBrepeat\fR [\fIcount\fR(1)|\fB\-\fR]

 Repeat the entire audio \fIcount\fR times, or once if \fIcount\fR is not given.

+The special value \fB\-\fR requests infinite repetition.

 Requires temporary file space to store the audio to be repeated.

 Note that repeating once yields two copies: the original audio and the

 repeated audio.

--- a/src/repeat.c

+++ b/src/repeat.c

@@ -29,6 +29,10 @@

   priv_t * p = (priv_t *)effp->priv;

   p->num_repeats = 1;

   --argc, ++argv;

+  if (argc == 1 && !strcmp(*argv, "-")) {

+    p->num_repeats = UINT_MAX;

+    return SOX_SUCCESS;

+  }

   do {NUMERIC_PARAMETER(num_repeats, 0, UINT_MAX - 1)} while (0);

   return argc? lsx_usage(effp) : SOX_SUCCESS;

 }

@@ -75,7 +79,8 @@

   while ((p->remaining_samples || p->remaining_repeats) && odone < *osamp) {

     if (!p->remaining_samples) {

       p->remaining_samples = p->num_samples;

-      --p->remaining_repeats;

+      if (p->remaining_repeats != UINT_MAX)

+        --p->remaining_repeats;

       rewind(p->tmp_file);

     }

     n = min(p->remaining_samples, *osamp - odone);