From 6edea74ea6deab4302fffa476d2b2dd724fa8f05 Mon Sep 17 00:00:00 2001
From: Linus Nielsen Feltzing <linus@haxx.se>
Date: Thu, 3 Apr 2003 07:20:57 +0000
Subject: Now VBRFix correctly handles all types of files, with or without ID3
 tags

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@3514 a1c6a512-1295-4272-9138-f99709370657
---
 apps/onplay.c | 93 +++++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 61 insertions(+), 32 deletions(-)

diff --git a/apps/onplay.c b/apps/onplay.c
index 74e7136738..90f6db78b0 100644
--- a/apps/onplay.c
+++ b/apps/onplay.c
@@ -117,16 +117,13 @@ static void xingupdate(int percent)
 extern unsigned char mp3buf[];
 extern unsigned char mp3end[];
 
-static int insert_space_in_file(char *fname, int num_bytes)
+static int insert_space_in_file(char *fname, int fpos, int num_bytes)
 {
     int readlen;
     int rc;
     int orig_fd, fd;
     char tmpname[MAX_PATH];
     
-    /* Use the mp3 buffer to write 0's in the file */
-    memset(mp3buf, 0, num_bytes);
-
     snprintf(tmpname, MAX_PATH, "%s.tmp", fname);
 
     orig_fd = open(fname, O_RDONLY);
@@ -142,12 +139,35 @@ static int insert_space_in_file(char *fname, int num_bytes)
         return 10*fd - 2;
     }
 
+    /* First, copy the initial portion (the ID3 tag) */
+    if(fpos)
+    {
+        readlen = read(orig_fd, mp3buf, fpos);
+        if(readlen < 0)
+        {
+            close(fd);
+            close(orig_fd);
+            return 10*readlen - 3;
+        }
+        
+        rc = write(fd, mp3buf, readlen);
+        if(rc < 0)
+        {
+            close(fd);
+            close(orig_fd);
+            return 10*rc - 4;
+        }
+    }
+    
+    /* Now insert some 0's in the file */
+    memset(mp3buf, 0, num_bytes);
+
     rc = write(fd, mp3buf, num_bytes);
     if(rc < 0)
     {
         close(orig_fd);
         close(fd);
-        return 10*rc - 3;
+        return 10*rc - 5;
     }
 
     rc = lseek(orig_fd, 0, SEEK_SET);
@@ -155,7 +175,7 @@ static int insert_space_in_file(char *fname, int num_bytes)
     {
         close(orig_fd);
         close(fd);
-        return 10*rc - 4;
+        return 10*rc - 6;
     }
 
     /* Copy the file */
@@ -166,7 +186,7 @@ static int insert_space_in_file(char *fname, int num_bytes)
         {
             close(fd);
             close(orig_fd);
-            return 10*readlen - 5;
+            return 10*readlen - 7;
         }
 
         rc = write(fd, mp3buf, readlen);
@@ -174,7 +194,7 @@ static int insert_space_in_file(char *fname, int num_bytes)
         {
             close(fd);
             close(orig_fd);
-            return 10*rc - 6;
+            return 10*rc - 8;
         }
     } while(readlen > 0);
     
@@ -185,14 +205,14 @@ static int insert_space_in_file(char *fname, int num_bytes)
     rc = remove(fname);
     if(rc < 0)
     {
-        return 10*rc - 7;
+        return 10*rc - 9;
     }
 
     /* Replace the old file with the new */
     rc = rename(tmpname, fname);
     if(rc < 0)
     {
-        return 10*rc - 8;
+        return 10*rc - 9;
     }
     
     return 0;
@@ -207,6 +227,7 @@ static bool vbr_fix(void)
     int flen;
     int num_frames;
     int fpos;
+    int numbytes;
 
     if(mpeg_status())
     {
@@ -222,11 +243,17 @@ static bool vbr_fix(void)
 
     rc = mp3info(&entry, selected_file);
     if(rc < 0)
-        return rc * 10 - 1;
+    {
+        splash(HZ*2, 0, true, "File error: %d", rc);
+        return true;
+    }
     
     fd = open(selected_file, O_RDWR);
     if(fd < 0)
-        return fd * 10 - 2;
+    {
+        splash(HZ*2, 0, true, "File error: %d", fd);
+        return true;
+    }
 
     flen = lseek(fd, 0, SEEK_END);
 
@@ -259,31 +286,33 @@ static bool vbr_fix(void)
             }
             else
             {
-                /* If not, insert some space, but only if there is no ID3
-                   tag in the file */
+                /* If not, insert some space. If there is an ID3 tag in the
+                   file we only insert just enough to squeeze the Xing header
+                   in. If not, we insert 4K. */
                 close(fd);
-                if(entry.first_frame_offset == 0)
+                if(entry.first_frame_offset)
+                    numbytes = 417;
+                else
+                    numbytes = 4096;
+                
+                rc = insert_space_in_file(selected_file,
+                                          entry.first_frame_offset, numbytes);
+                
+                if(rc < 0)
                 {
-                    rc = insert_space_in_file(selected_file, 4096);
-                    if(rc < 0)
-                    {
-                        splash(HZ*2, 0, true, "File error: %d", rc);
-                        return rc * 10 - 3;
-                    }
-
-                    /* Reopen the file */
-                    fd = open(selected_file, O_RDWR);
-                    if(fd < 0)
-                        return fd * 10 - 4;
-
-                    fpos = 4096-417;
+                    splash(HZ*2, 0, true, "File error: %d", rc);
+                    return true;
                 }
-                else
+                
+                /* Reopen the file */
+                fd = open(selected_file, O_RDWR);
+                if(fd < 0)
                 {
-                    splash(HZ*2, 0, true,
-                           "There is no room for a Xing header");
-                    return -3;
+                    splash(HZ*2, 0, true, "File reopen error: %d", fd);
+                    return true;
                 }
+                
+                fpos = numbytes - 417;
             }
         }
         
-- 
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