main: add option parsing

shairport.c

@@ -1,4 +1,5 @@
 #include <signal.h>
+#include <unistd.h>
 #include <memory.h>
 #include "common.h"
 #include "rtsp.h"
@@ -22,20 +23,77 @@ static void sig_shutdown(int foo, siginfo_t *bar, void *baz) {
     shutdown();
 }
 
+void usage(char *progname) {
+    printf("Usage: %s [options...] [-- [output options...]]\n\n", progname);
+    printf("Available options:\n"
+           "    -h          show this help\n"
+           "    -p port     set RTSP listening port\n"
+           "    -n name     set advertised name\n"
+           "    -o output   set audio output\n"
+           "    -s fill     set how full the buffer must be before audio output starts\n"
+           "                    This value is in frames; default 220\n"
+           "Run %s -o <output> -h to find the available options for a specific output\n"
+           "\n", progname);
+
+    if (config.output_name)
+        config.output = audio_get_output(config.output_name);
+    if (config.output) {
+        printf("Options for output %s:\n", config.output_name);
+        config.output->help();
+    } else {
+        audio_ls_outputs();
+    }
+}
+
+int parse_options(int argc, char **argv) {
+    char opt;
+    while ((opt = getopt(argc, argv, "+hp:n:o:s:")) > 0) {
+        switch (opt) {
+            default:
+                printf("Unknown argument -%c\n", optopt);
+            case 'h':
+                usage(argv[0]);
+                exit(1);
+            case 'v':
+                debuglev++;
+                break;
+            case 'p':
+                config.port = atoi(optarg);
+                break;
+            case 'n':
+                config.apname = optarg;
+                break;
+            case 'o':
+                config.output_name = optarg;
+                break;
+            case 's':
+                config.buffer_start_fill = atoi(optarg);
+                break;
+        }
+    }
+    return optind;
+}
+
 
 int main(int argc, char **argv) {
     memset(&config, 0, sizeof(config));
-//    config.password = "hello";
-    memcpy(config.hw_addr, "\0\x11\x22\x33\x44\x55", 6);
+
+    // set defaults
     config.buffer_start_fill = 220;
     config.port = 9000;
-    config.apname = "hellothere";
+    char hostname[100];
+    gethostname(hostname, 100);
+    config.apname = malloc(20 + 100);
+    snprintf(config.apname, 20 + 100, "Shairport on %s", hostname);
 
+    int audio_arg = parse_options(argc, argv);
+    
     config.output = audio_get_output(config.output_name);
     if (!config.output) {
         audio_ls_outputs();
         die("Invalid audio output specified!\n");
     }
+    config.output->init(argc-audio_arg, argv+audio_arg);
 
     // mask off all signals before creating threads.
     // this way we control which thread gets which signals.
@@ -60,8 +118,6 @@ int main(int argc, char **argv) {
     sigaction(SIGTERM, &sa, NULL);
     sigaction(SIGCHLD, &sa, NULL);
 
-    config.output->init(0, 0);
-
     rtsp_listen_loop();
 
     // should not.