{Tag,Song}Print, PlayerCommands: report song duration with milliseconds precision

NEWS

@@ -2,6 +2,7 @@ ver 0.20 (not yet released)
 * protocol
   - "commands" returns playlist commands only if playlist_directory configured
   - "search"/"find" have a "window" parameter
+  - report song duration with milliseconds precision
 * tags
   - ape: drop support for non-standard tag "album artist"
 * output

doc/protocol.xml

@@ -517,6 +517,15 @@
               </listitem>
               <listitem>
                 <para>
+                  <varname>duration</varname>:
+                  <footnote id="since_0_20"><simpara>Introduced with <application>MPD</application> 0.20</simpara></footnote>
+                  <returnvalue>
+                    Duration of the current song in seconds.
+                  </returnvalue>
+                </para>
+              </listitem>
+              <listitem>
+                <para>
                   <varname>bitrate</varname>:
                   <returnvalue>instantaneous bitrate in
                   kbps</returnvalue>

src/SongPrint.cxx

@@ -122,5 +122,8 @@ song_print_info(Client &client, const DetachedSong &song, bool base)
 
 	const auto duration = song.GetDuration();
 	if (!duration.IsNegative())
-		client_printf(client, "Time: %u\n", duration.RoundS());
+		client_printf(client, "Time: %i\n"
+			      "duration: %1.3f\n",
+			      duration.RoundS(),
+			      duration.ToDoubleS());
 }

src/TagPrint.cxx

@@ -23,8 +23,6 @@
 #include "tag/TagSettings.h"
 #include "client/Client.hxx"
 
-#define SONG_TIME "Time: "
-
 void tag_print_types(Client &client)
 {
 	int i;
@@ -53,7 +51,10 @@ tag_print_values(Client &client, const Tag &tag)
 void tag_print(Client &client, const Tag &tag)
 {
 	if (!tag.duration.IsNegative())
-		client_printf(client, SONG_TIME "%i\n", tag.duration.RoundS());
+		client_printf(client, "Time: %i\n"
+			      "duration: %1.3f\n",
+			      tag.duration.RoundS(),
+			      tag.duration.ToDoubleS());
 
 	tag_print_values(client, tag);
 }

src/command/PlayerCommands.cxx

@@ -182,6 +182,10 @@ handle_status(Client &client,
 			      player_status.elapsed_time.ToDoubleS(),
 			      player_status.bit_rate);
 
+		if (!player_status.total_time.IsNegative())
+			client_printf(client, "duration: %1.3f\n",
+				      player_status.total_time.ToDoubleS());
+
 		if (player_status.audio_format.IsDefined()) {
 			struct audio_format_string af_string;