shithub: sox

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sox: allow single input file with any combine method

There is no reason to require more than one input file with the merge,
mix, etc combine methods.  All the code works correctly with only one
file, and allowing this simplifies use when the number of files is
unknown.

--- a/src/sox.c

+++ b/src/sox.c

@@ -2931,8 +2931,8 @@

     combine_method = sox_concatenate;

   /* Make sure we got at least the required # of input filenames */

-  if (input_count < (size_t)(is_serial(combine_method) ? 1 : 2))

-    usage("Not enough input filenames specified");

+  if (input_count < 1)

+    usage("No input filenames specified");

   /* Check for misplaced input/output-specific options */

   for (i = 0; i < input_count; ++i) {