commit aeecbcaa8d553aa1c48f23ece9e59214b68967c2
Author: Adam Broschinski <adam.broschin...@gmail.com>
Date: Tue Oct 5 22:45:41 2010 -0400
Skip writing empty playlists on 3rd gen shuffles
The third gen shuffles do not handle empty playlists well so
the patch makes the changes necessary to allow them to be skipped.
This delays the writing of the number of playlists in the bdhs header
until we count the number of nonempty playlist in write_hphs.
src/itdb_itunesdb.c | 75 +++++++++++++++++++++++++++++++-------------------
1 files changed, 46 insertions(+), 29 deletions(-)
---
diff --git a/src/itdb_itunesdb.c b/src/itdb_itunesdb.c
index 3f6f9b6..f4f1344 100644
--- a/src/itdb_itunesdb.c
+++ b/src/itdb_itunesdb.c
@@ -6575,6 +6575,7 @@ static gboolean write_hphs (FExport *fexp)
GList *gl;
guint16 playlistcnt;
guint16 podcastscnt;
+ guint16 mastercnt;
guint16 audiobookscnt;
g_return_val_if_fail (fexp, FALSE);
@@ -6583,9 +6584,36 @@ static gboolean write_hphs (FExport *fexp)
cts = fexp->wcontents;
hphs_seek = cts->pos;
- playlistcnt = itdb_playlists_number (fexp->itdb);
+ playlistcnt = 0; /* Number of nonempty playlists, this may not be the
same
+ as what itdb_playlists_number returns*/
podcastscnt = 0; /* Number of podcast playlists should be 1 if one
exists*/
- audiobookscnt = 0;
+ mastercnt = 0; /* Number of master playlists should be 1 */
+ audiobookscnt = 0; /* Number of audiobook playlists */
+
+ /* We have to walk the playlist list before we can write the needed
counts */
+ for (gl = fexp->itdb->playlists; gl; gl = gl->next) {
+ Itdb_Playlist *pl = gl->data;
+
+ if (!pl->members) {
+ /* If the playlist has no members skip it */
+ continue;
+ }
+ /* Otherwise count it and count its type */
+ playlistcnt++;
+
+ if (itdb_playlist_is_mpl (pl)){
+ mastercnt++;
+ }
+ else if (itdb_playlist_is_podcasts (pl)) {
+ podcastscnt++;
+ }
+ else if (itdb_playlist_is_audiobooks (pl)) {
+ audiobookscnt++;
+ }
+ }
+
+ /* Add nonempty playlist count to bdhs */
+ put32lint_seek (cts, playlistcnt, 16);
/* Add the Playlist Header Offset */
put32lint_seek (cts, cts->pos, 40);
@@ -6594,14 +6622,12 @@ static gboolean write_hphs (FExport *fexp)
put32lint (cts, -1); /* Length of header to be added later */
put16lint (cts, playlistcnt); /* Number of playlists */
put16_n0 (cts, 1); /* Unknown */
- put16lint (cts, 0xffff); /* Number of non podcast playlists if there
- isn't a podcast playlist leave this
- current value. There should be at most 1
- podcast playlist. */
- put16lint (cts, 0x0100); /* Unknown */
- put16lint (cts, 0xffff); /* Number of non audiobook playlists if there
- isn't a audiobook playlist leave this field
- the current value. */
+ put16lint (cts, playlistcnt-podcastscnt); /* Number of non podcast
playlists
+ there should be a maximum
of 1
+ podcast playlist. */
+ put16lint (cts, mastercnt); /* Number of master playlists there should
be a
+ maximum of 1 master playlist */
+ put16lint (cts, playlistcnt-audiobookscnt); /* Number of non audiobook
playlists */
put16_n0 (cts, 1);
playlist_seek = cts->pos;
@@ -6612,29 +6638,19 @@ static gboolean write_hphs (FExport *fexp)
for (gl = fexp->itdb->playlists; gl; gl = gl->next)
{
Itdb_Playlist *pl = gl->data;
-
- /* Write this headers offset */
+
+ if (!pl->members) {
+ continue;
+ }
+
+ /* Write this playlist's header offset */
put32lint_seek (cts, cts->pos, playlist_seek);
- if (itdb_playlist_is_podcasts (pl))
- podcastscnt++;
- else if (itdb_playlist_is_audiobooks (pl))
- audiobookscnt++;
g_return_val_if_fail (write_lphs (cts, pl),FALSE);
/* Move to the field for the next header */
playlist_seek += 4;
}
- /* Is there at least 1 podcast playlist? If so correct the
- first 0xffff from before */
- if (podcastscnt != 0)
- put16lint_seek (cts, playlistcnt-podcastscnt, hphs_seek+12);
-
- /* Is there at least 1 audiobook playlist? If so correct the
- second 0xffff from before */
- if (audiobookscnt != 0)
- put16lint_seek (cts, playlistcnt-audiobookscnt, hphs_seek+16);
-
return TRUE;
}
@@ -6659,15 +6675,16 @@ static gboolean write_bdhs (FExport *fexp)
put32lint (cts, 0x02000003); /* Unknown */
put32lint (cts, -1); /* Length of header to be added later*/
put32lint (cts, trackcnt); /* Number of tracks */
- put32lint (cts, playlistcnt); /* Number of playlists */
+ put32_n0 (cts, 1); /* Number of nonempty playlists to be written later
+ in write_hphs see the note below! */
put32_n0 (cts, 2); /* Unknown */
/* TODO: Parse the max volume */
- put8int (cts, 0); /* Max Volume currently ignored and set to max */
+ put8int (cts, 0); /* Limit max volume currently ignored and set to off
*/
/* TODO: Find another source of the voiceover option */
put8int (cts, 1); /* Voiceover currently ignored and set to on */
put16_n0 (cts, 1); /* Unknown */
- /* If the bdhs header changes the offsets of these fields may change
+ /* NOTE: If the bdhs header changes the offsets of these fields may
change
make sure you correct the field offset in their respective tags */
put32lint (cts, -1); /* Number of tracks excluding podcasts and
audiobooks
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