db/simple/Song: use std::chrono::duration for start_ms and end_ms

src/SongSave.cxx

@@ -52,7 +52,7 @@ song_save(BufferedOutputStream &os, const Song &song)
 {
 	os.Format(SONG_BEGIN "%s\n", song.uri);
 
-	range_save(os, song.start_ms, song.end_ms);
+	range_save(os, song.start_time.ToMS(), song.end_time.ToMS());
 
 	tag_save(os, song.tag);
 

src/db/plugins/simple/Song.cxx

@@ -30,7 +30,8 @@
 #include <stdlib.h>
 
 inline Song::Song(const char *_uri, size_t uri_length, Directory &_parent)
-	:parent(&_parent), mtime(0), start_ms(0), end_ms(0)
+	:parent(&_parent), mtime(0),
+	 start_time(SongTime::zero()), end_time(SongTime::zero())
 {
 	memcpy(uri, _uri, uri_length + 1);
 }
@@ -59,8 +60,8 @@ Song::NewFrom(DetachedSong &&other, Directory &parent)
 	Song *song = song_alloc(other.GetURI(), parent);
 	song->tag = std::move(other.WritableTag());
 	song->mtime = other.GetLastModified();
-	song->start_ms = other.GetStartTime().ToMS();
-	song->end_ms = other.GetEndTime().ToMS();
+	song->start_time = other.GetStartTime();
+	song->end_time = other.GetEndTime();
 	return song;
 }
 
@@ -105,7 +106,7 @@ Song::Export() const
 	dest.real_uri = nullptr;
 	dest.tag = &tag;
 	dest.mtime = mtime;
-	dest.start_time = SongTime::FromMS(start_ms);
-	dest.end_time = SongTime::FromMS(end_ms);
+	dest.start_time = start_time;
+	dest.end_time = end_time;
 	return dest;
 }

src/db/plugins/simple/Song.hxx

@@ -20,6 +20,7 @@
 #ifndef MPD_SONG_HXX
 #define MPD_SONG_HXX
 
+#include "Chrono.hxx"
 #include "tag/Tag.hxx"
 #include "Compiler.h"
 
@@ -71,15 +72,15 @@ struct Song {
 	time_t mtime;
 
 	/**
-	 * Start of this sub-song within the file in milliseconds.
+	 * Start of this sub-song within the file.
 	 */
-	unsigned start_ms;
+	SongTime start_time;
 
 	/**
-	 * End of this sub-song within the file in milliseconds.
+	 * End of this sub-song within the file.
 	 * Unused if zero.
 	 */
-	unsigned end_ms;
+	SongTime end_time;
 
 	/**
 	 * The file name.