From c41322c59182e4cb10de185f7c14a59a015ac994 Mon Sep 17 00:00:00 2001
From: Linus Nielsen Feltzing <linus@haxx.se>
Date: Sun, 27 Oct 2002 23:07:26 +0000
Subject: Better skipping of leading garbage. Fixes bug #625868.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@2752 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/id3.c  | 10 ++++------
 firmware/id3.h  |  3 +++
 firmware/mpeg.c |  4 ++--
 3 files changed, 9 insertions(+), 8 deletions(-)

(limited to 'firmware')

diff --git a/firmware/id3.c b/firmware/id3.c
index 54f0f970c1..e0e3ca1abf 100644
--- a/firmware/id3.c
+++ b/firmware/id3.c
@@ -713,12 +713,10 @@ static int getsonglength(int fd, struct mp3entry *entry)
         filetime = entry->filesize/bpf*tpf;
     }
 
-    DEBUGF("Old ID3V2 length: %x\n", entry->id3v2len);
-    /* Adjust the tag length only if there is a tag present */
-    if(entry->id3v2len || header_found)
-        entry->id3v2len = bytecount;
-    DEBUGF("New ID3V2 length: %x\n", bytecount);
-    
+    /* Update the seek point for the first playable frame */
+    entry->first_frame_offset = bytecount;
+    DEBUGF("First frame is at %x\n", entry->first_frame_offset);
+
     return filetime;
 }
 
diff --git a/firmware/id3.h b/firmware/id3.h
index d76614f540..88f50ba9b1 100644
--- a/firmware/id3.h
+++ b/firmware/id3.h
@@ -33,6 +33,9 @@ struct mp3entry {
     unsigned int frequency;
     unsigned int id3v2len;
     unsigned int id3v1len;
+    unsigned int first_frame_offset; /* Byte offset to first real MP3 frame.
+                                        Used for skipping leading garbage to
+                                        avoid gaps between tracks. */
     unsigned int filesize; /* in bytes */
     unsigned int length;   /* song length */
     unsigned int elapsed;  /* ms played */
diff --git a/firmware/mpeg.c b/firmware/mpeg.c
index d75ac2085e..e8fd1acbc7 100644
--- a/firmware/mpeg.c
+++ b/firmware/mpeg.c
@@ -775,7 +775,7 @@ static int new_file(int steps)
             {
                 /* skip past id3v2 tag */
                 lseek(mpeg_file, 
-                      id3tags[new_tag_idx]->id3.id3v2len,
+                      id3tags[new_tag_idx]->id3.first_frame_offset,
                       SEEK_SET);
                 id3tags[new_tag_idx]->id3.index = steps;
                 id3tags[new_tag_idx]->id3.offset = 0;
@@ -967,7 +967,7 @@ static void mpeg_thread(void)
                 else {
                     /* skip past id3v2 tag */
                     lseek(mpeg_file, 
-                          id3tags[tag_read_idx]->id3.id3v2len, 
+                          id3tags[tag_read_idx]->id3.first_frame_offset, 
                           SEEK_SET);
 
                 }
-- 
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