experiment with pipe backend.

audio_pipe.c

@@ -29,6 +29,7 @@
 #include <fcntl.h>
 #include <memory.h>
 #include <stdlib.h>
+#include <errno.h>
 #include "common.h"
 #include "audio.h"
 
@@ -37,11 +38,14 @@ static int fd = -1;
 char *pipename = NULL;
 
 static void start(int sample_rate) {
- fd = open(pipename, O_WRONLY);
+ debug(1,"Pipename to start is \"%s\"",pipename);
+ fd = open(pipename, O_WRONLY | O_NONBLOCK);
+ /*
  if (fd < 0) {
  perror("open");
  die("could not open specified pipe for writing");
  }
+ */
 }
 
 static void play(short buf[], int samples) {
@@ -53,10 +57,28 @@ static void stop(void) {
 }
 
 static int init(int argc, char **argv, config_t *cfgp) {
- if (argc != 1)
- die("bad argument(s) to pipe");
 
- pipename = strdup(argv[0]);
+ if (cfgp!=NULL) {
+ /* Get the Output Pipename. */
+ const char *str;
+ if(config_lookup_string(cfgp, "pipe.name", &str)) {
+ pipename = (char*)str;
+ }
+ }
+
+
+ if ((pipename==NULL) && (argc != 1))
+ die("bad or missing argument(s) to pipe");
+
+ if (argc==1)
+ pipename = strdup(argv[0]);
+
+ // here, create the pipe
+ if (mkfifo(pipename, 0644) && errno != EEXIST)
+ die("Could not create metadata FIFO %s", pipename);
+
+
+ debug(1,"Pipename is \"%s\"",pipename);
 
  // test open pipe so we error on startup if it's going to fail
  start(44100);

scripts/shairport-sync.conf

@@ -42,6 +42,7 @@ sessioncontrol =
 // session_timeout = 120;
 };
 
+// These are parameters for the alsa back end, the only back end that currently works with shairport-sync
 alsa =
 {
 // output_device = "default";
@@ -50,3 +51,9 @@ alsa =
 // mixer_control_name = "PCM"; // the name of the mixer to use -- there is no default.
 };
 
+// These are parameters for the pipe back end, an experimental back end that directs output to a pipe.
+pipe =
+{
+// name = "/dev/null";
+};
+