db-gdbm.c:

- Added support for db_timestamp field. Field is the modification time
of the db record and is checked against the file modification time
in file system scans.

mp3-scanner.h:
- Added db_timestamp field. This is now distinct from the file's
modification time which may, in some cases, be embedded in the file.

mp3-scanner.c:
- Added mac_to_unix_time to convert mac timestamps to unix ones.
- Mp3 files get their modification time from the files mod time.
- AAC files get their modification time from the embedded mod time.
- AAC files get their added time from the embedded creation time.

src/db-gdbm.c

@@ -101,6 +101,7 @@ typedef struct tag_mp3packed {
     int time_added;
     int time_modified;
     int time_played;
+    int db_timestamp;
 
     int bpm; // DB Version 3
 
@@ -647,6 +648,7 @@ datum *db_packrecord(MP3FILE *pmp3) {
     ppacked->time_added=pmp3->time_added;
     ppacked->time_modified=pmp3->time_modified;
     ppacked->time_played=pmp3->time_played;
+    ppacked->db_timestamp=pmp3->db_timestamp;
     ppacked->bpm=pmp3->bpm;
     ppacked->compilation=pmp3->compilation;
     ppacked->id=pmp3->id;
@@ -755,6 +757,7 @@ int db_unpackrecord(datum *pdatum, MP3FILE *pmp3) {
     pmp3->total_discs=ppacked->total_discs;
     pmp3->time_added=ppacked->time_added;
     pmp3->time_modified=ppacked->time_modified;
+    pmp3->db_timestamp=ppacked->db_timestamp;
     pmp3->time_played=ppacked->time_played;
     pmp3->bpm=ppacked->bpm;
     pmp3->compilation=ppacked->compilation;
@@ -851,7 +854,9 @@ int db_add(MP3FILE *pmp3) {
     ppacked=(MP3PACKED *)pnew->dptr;
     if(!ppacked->time_added)
 	ppacked->time_added=(int)time(NULL);
+    if(!ppacked->time_modified)
       ppacked->time_modified=(int)time(NULL);
+    ppacked->db_timestamp = (int)time(NULL);
     ppacked->time_played=0; /* do we want to keep track of this? */
 
     db_writelock();
@@ -1442,7 +1447,7 @@ int db_last_modified(int id) {
     if(!pmp3) {
 	retval=0;
     } else {
-	retval=pmp3->time_modified;
+      retval = pmp3->db_timestamp;
     }
 
     if(pmp3) {

src/mp3-scanner.c

@@ -68,7 +68,6 @@ typedef struct tag_scan_id3header {
 
 #define MAYBEFREE(a) { if((a)) free((a)); };
 
-
 /*
  * Globals
  */
@@ -281,6 +280,16 @@ static taghandler taghandlers[] = {
     { NULL, 0 }
 };
 
+time_t mac_to_unix_time(int t) {
+  struct timeval        tv;
+  struct timezone       tz;
+  
+  gettimeofday(&tv, &tz);
+  
+  return (t - (365L * 66L * 24L * 60L * 60L + 17L * 60L * 60L * 24L) +
+          (tz.tz_minuteswest * 60));
+}
+
 /*
  * scan_init
  *
@@ -495,7 +504,7 @@ void scan_music_file(char *path, struct dirent *pde, struct stat *psb) {
 	mp3file.time_added=psb->st_mtime;
 	if(psb->st_ctime < mp3file.time_added)
 	    mp3file.time_added=psb->st_ctime;
-	mp3file.time_modified=time(NULL);
+        mp3file.time_modified=psb->st_mtime;
 
 	DPRINTF(E_DBG,L_SCAN," Date Added: %d\n",mp3file.time_added);
 
@@ -1027,6 +1036,7 @@ int scan_get_aacfileinfo(char *file, MP3FILE *pmp3) {
     off_t file_size;
     int ms;
     unsigned char buffer[2];
+    int time = 0;
 
     DPRINTF(E_DBG,L_SCAN,"Getting AAC file info\n");
 
@@ -1044,7 +1054,14 @@ int scan_get_aacfileinfo(char *file, MP3FILE *pmp3) {
     /* now, hunt for the mvhd atom */
     atom_offset = aac_drilltoatom(infile, "moov:mvhd", &atom_length);
     if(atom_offset != -1) {
-	fseek(infile,12,SEEK_CUR);
+        fseek(infile, 4, SEEK_CUR);
+        fread((void *)&time, sizeof(int), 1, infile);
+        time = ntohl(time);
+        pmp3->time_added = mac_to_unix_time(time);
+
+        fread((void *)&time, sizeof(int), 1, infile);
+        time = ntohl(time);
+        pmp3->time_modified = mac_to_unix_time(time);
 	fread((void*)&sample_size,1,sizeof(int),infile);
 	fread((void*)&samples,1,sizeof(int),infile);
 
@@ -1111,6 +1128,7 @@ int scan_get_aacfileinfo(char *file, MP3FILE *pmp3) {
 	if (atom_offset != -1) {
 	    pmp3->bitrate = atom_length / ((pmp3->song_length / 1000) * 128);
 	}
+
     }
 
     fclose(infile);

src/mp3-scanner.h

@@ -54,6 +54,7 @@ typedef struct tag_mp3file {
     int time_added;
     int time_modified;
     int time_played;
+    int db_timestamp;
     
     int bpm;         /* TBPM */