Fixed Cover Bug, checking dependencies

README.md

@@ -146,6 +146,10 @@ Debian, Ubuntu and Raspbian users can get the basics with:
 - `# apt-get install libssl-dev` if you want to use OpenSSL and libcrypto, or use mbed TLS otherwise.
 - `# apt-get install libmbedtls-dev` if you want to use mbed TLS, or use OpenSSL/libcrypto otherwise. You can still use PolarSSL with `apt-get install libpolarssl-dev` if you want to use PolarSSL, but it is deprecated as it's not longer being supported.
 - `# apt-get install libsoxr-dev` if you want support for libsoxr-based resampling. This library is in many recent distributions; if not, instructions for how to build it from source for Rasbpian/Debian Wheezy are available at [LIBSOXR.md](https://github.com/mikebrady/shairport-sync/blob/master/LIBSOXR.md).
+- `# apt-get install libmosquitto-dev` if you want to use the mqtt client
+
+If you just want to have the default configuration options (systemd):
+- `# apt-get install build-essential git xmltoman autoconf automake libtool libpopt-dev libconfig-dev libasound2-dev libpulse-dev avahi-daemon libavahi-client-dev libssl-dev libsoxr-dev` 
 
 If you wish to include the Apple ALAC decoder, you need install it first – please refer to the [ALAC](https://github.com/mikebrady/alac) repository for more information.
 

configure.ac

@@ -352,6 +352,9 @@ AC_ARG_WITH(mqtt-client, [  --with-mqtt-client = include a client for MQTT -- th
   ],)
 AM_CONDITIONAL([USE_MQTT], [test "x$REQUESTED_MQTT" = "x1"])
 
+if test "x$REQUESTED_MQTT" = "x1" && test "x$REQUESTED_AVAHI" != "x1"; then
+  AC_MSG_WARN([>>MQTT needs Avahi to allow remote control functionality. Only Metadata publishing will be supported])
+fi
 
 if test "x$REQUESTED_MPRIS" = "x1" || test "x$REQUESTED_DBUS" = "x1" || test "x$REQUESTED_MQTT" = "x1"; then
   AC_MSG_RESULT(>>Including extended metadata and DACP client support)

mqtt.c

@@ -176,7 +176,7 @@ void mqtt_process_metadata(uint32_t type, uint32_t code, char *data, uint32_t le
         mqtt_publish("play_resume", data, length);
         break;
       case 'PICT':
-        if (config.mqtt_publish_parsed) {
+        if (config.mqtt_publish_cover) {
           mqtt_publish("cover", data, length);
         }
         break;

shairport.c

@@ -1045,7 +1045,17 @@ int parse_options(int argc, char **argv) {
     config_set_lookup_bool(config.cfg, "mqtt.publish_raw", &config.mqtt_publish_raw);
     config_set_lookup_bool(config.cfg, "mqtt.publish_parsed", &config.mqtt_publish_parsed);
     config_set_lookup_bool(config.cfg, "mqtt.publish_cover", &config.mqtt_publish_cover);
+    if (config.mqtt_publish_cover && !config.get_coverart) {
+      die("You need to have metadata.include_cover_art enabled in order to use mqtt.publish_cover");
+    }
     config_set_lookup_bool(config.cfg, "mqtt.enable_remote", &config.mqtt_enable_remote);
+#ifndef CONFIG_AVAHI
+        if (config.mqtt_enable_remote) {
+          die("You have enabled MQTT remote control which requires shairport-sync to be built with "
+              "Avahi, but your installation is not using avahi. Please reinstall/recompile with "
+              "avahi enabled, or disable remote control.");
+        }
+#endif
 #endif
   }
 
@@ -1750,6 +1760,15 @@ int main(int argc, char **argv) {
   debug(1, "metadata socket packet size is \"%d\".", config.metadata_sockmsglength);
   debug(1, "get-coverart is %d.", config.get_coverart);
 #endif
+#ifdef CONFIG_MQTT
+  debug(1, "mqtt is %sabled.", (config.mqtt_enabled?"en":"dis"));
+  debug(1, "mqtt hostname is %s, port is %d.", config.mqtt_hostname. config.mqtt_port);
+  debug(1, "mqtt topic is %s.", config.mqtt_topic);
+  debug(1, "mqtt will%s publish raw metadata.", (config.mqtt_publish_raw?"":" NOT"));
+  debug(1, "mqtt will%s publish parsed metadata.", (config.mqtt_publish_parsed?"":" NOT"));
+  debug(1, "mqtt will%s publish cover Art.", (config.mqtt_publish_cover?"":" NOT"));
+  debug(1, "mqtt remote control is %sabled .", (config.mqtt_enable_remote?"en":"dis"));
+#endif
 
 #ifdef CONFIG_CONVOLUTION
   debug(1, "convolution is %d.", config.convolution);