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Update example3 so that it can play mono files on OSX with coreaudio.

--- a/src/example3.c

+++ b/src/example3.c

@@ -41,10 +41,14 @@

 /*

  * On an alsa capable system, plays an audio file starting 10 seconds in.

- * Copes with sample-rate change if necessary.  E.g. example3 song2.ogg

+ * Copes with sample-rate and channel change if necessary since its

+ * common for audio drivers to to support subset of rates and channel

+ * counts..

+ * E.g. example3 song2.ogg

  *

  * Can easily be changed to work with other audio device drivers supported

- * by libSoX; e.g. "oss", "ao", etc.  See the soxformat(7) manual page.

+ * by libSoX; e.g. "oss", "ao", "coreaudio", etc.

+ * See the soxformat(7) manual page.

  */

 int main(int argc, char * argv[])

 {

@@ -74,6 +78,12 @@

   if (in->signal.rate != out->signal.rate) {

     e = sox_create_effect(sox_find_effect("rate"));

+    assert(sox_effect_options(e, 0, NULL) == SOX_SUCCESS);

+    assert(sox_add_effect(chain, e, &in->signal, &out->signal) == SOX_SUCCESS);

+  }

+

+  if (in->signal.channels != out->signal.channels) {

+    e = sox_create_effect(sox_find_effect("channels"));

     assert(sox_effect_options(e, 0, NULL) == SOX_SUCCESS);

     assert(sox_add_effect(chain, e, &in->signal, &out->signal) == SOX_SUCCESS);

   }