playrtp: refuse to play RTP via RTP.

playrtp attempting to use the RTP backend becomes the default
situation if no local sound output API is available.  This can happen
using (e.g.)  Fink's GCC 4.4, because it cannot compile Apple's header
files, and so concludes that CoreAudio/AudioHardware.h is not
available.

This is about the minimal possible change to stop playrtp crashing in
this case.  There are a variety of better possible answers.

diff --git a/clients/playrtp.c b/clients/playrtp.c
index 2ab67906ba5ffff9ab44cee412bb397b7092a6fb..2bd2452321a36e23d8564e5cbaece6b72dafe644 100644 (file)
--- a/clients/playrtp.c
+++ b/clients/playrtp.c
@@ -678,6 +678,12 @@ int main(int argc, char **argv) {
     }
   }
   if(config_read(0, NULL)) disorder_fatal(0, "cannot read configuration");
+  if(backend == &uaudio_rtp) {
+    /* This means that you have NO local sound output.  This can happen if you
+     * use a non-Apple GCC on a Mac (because it doesn't know how to compile
+     * CoreAudio/AudioHardware.h). */
+    disorder_fatal(0, "cannot play RTP through RTP");
+  }
   if(!maxbuffer)
     maxbuffer = 2 * minbuffer;
   argc -= optind;