Differences

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--- himddiskformat [2011/09/04 12:43] – fix end-of-code tag. megadiscman
+++ himddiskformat [2012/01/05 22:55] (current) – Mention that tracks with variable MPEG version and variable MPEG layer can't be played back megadiscman
@@ Line 291: / Line 291: @@
 <code>
 DWORD   - date of recording (FAT format, 16 bit date, 16 bit time of day)
-DWORD   + "EkbVersion" (Mac MP3: 0, Mac WAV: 10012; upload requirement: == 10012)
+DWORD   ! "EkbVersion" (Mac MP3: 0, Mac WAV: 10012; upload requirement: == 10012)
 WORD    - Title (string number)
 A WORD    - Artist (string number)
@@ Line 297: / Line 297: @@
 E BYTE    - Track number (within Album, not on MD)
 F BYTE    - "Mode"
-8 BYTES + MgrCK (upload requirement: completely zero)
+8 BYTES ! MgrCK (upload requirement: completely zero)
 8 BYTES   CMac
-BYTE    ? CodecId (see below)
+BYTE    - CodecId (see below)
-3 BYTES ? Codec specific info
+3 BYTES - Codec specific info
-WORD    ? Part Number (index into Parts Info Table)
+WORD    - Part Number (index into Parts Info Table)
-WORD    ? Track Number
+WORD    - Track Number
-WORD    ? Total time (units of seconds)
+WORD    + Total time (units of seconds)
-A BYTE    ? "Lt" (Mac MP3: 10, Mac WAV: 1; upload requirement: == 1)
+A BYTE    + "Lt" (Mac MP3: 10, Mac WAV: 1; upload requirement: == 1)
-B BYTE    ? "Dest" (upload requirement: == 1)
+B BYTE    + "Dest" (upload requirement: == 1)
 C WORD    + More codec specific info
 E WORD    + reserved
 20 BYTE + Content ID (for Mac Transferred Data: 02 03 00 00 + 16 random bytes)
-DWORD   + Start time (FAT format)
+DWORD   + Start of playback license validity (FAT format, or 0 for no restriction)
-DWORD   + End time (FAT format)
+DWORD   + End of playback license validity (FAT format, or 0 for no restriction)
 C BYTE    + "Xcc" (Mac MP3/WAV: 01; upload requirement: == 03 || == 07)
-D BYTE    ? "Ct"
+D BYTE    + "Ct"
-E BYTE    ? "Cc" (Mac MP3: 40, Mac WAV: 44; upload requirement: == 08 || == 48)
+E BYTE    + "Cc" (Mac MP3: 40, Mac WAV: 44; upload requirement: == 08 || == 48)
 F BYTE    + "Cn" (Mac MP3: 00, Mac WAV: 3)
 </code>
-The +/-/? means: "+" this field influences the MAC. "-" this field does not influence the MAC. "?" we don't know yet.
+The +/-/! means: "+" this field is included in MAC calculation. "-" this field does not influence the MAC. "!" this field controls the MAC calculation
 "upload requirement" means that the HiMD Transfer Tool for Mac checks the given condition before allowing an upload of a track to the PC. These checks are independent from the track format. "Mac MP3"/"Mac WAV" means that these values are set by the HiMD transfer tool if downloading that type of music. Probably the fields annotated that way are involved in copy controlling. The first entry in the track info table is a dummy entry that contains the number of the first free track in its Track number field. All free entries are chained using that field.
@@ Line 362: / Line 362: @@
   * 0023 bit field
     * 80: Always set
-    * 40: Variable MPEG version
+    * 40: Variable MPEG version (tracks with this bit set cause "cannot play")
-    * 20: Variable MPEG Layer
+    * 20: Variable MPEG Layer (tracks with this bit set cause "cannot play")
     * 10: Variable bitrate
     * 08: Variable sample rate