moved id3 related code to a separate utility module since several

[vlc] / modules / demux / util / id3.c

diff --git a/modules/demux/util/id3.c b/modules/demux/util/id3.c
new file mode 100644 (file)
index 0000000..8284400
--- /dev/null
+++ b/modules/demux/util/id3.c
@@ -0,0 +1,114 @@
+/*****************************************************************************
+ * audio.c : mpeg audio Stream input module for vlc
+ *****************************************************************************
+ * Copyright (C) 2001 VideoLAN
+ * $Id: id3.c,v 1.1 2002/08/24 21:35:31 sigmunau Exp $
+ *
+ * Authors: Laurent Aimar <fenrir@via.ecp.fr>
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+#include <stdlib.h>                                      /* malloc(), free() */
+#include <string.h>
+
+#include <vlc/vlc.h>
+#include <vlc/input.h>
+
+#include <sys/types.h>
+
+/*****************************************************************************
+ * Local prototypes
+ *****************************************************************************/
+static int  SkipID3Tag ( vlc_object_t * );
+
+/* TODO: support MPEG-2.5, not difficult, but I need somes samples... */
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+vlc_module_begin();
+    set_description( _("Simple id3 tag skipper" ) );
+    set_capability( "id3", 50 );
+    set_callbacks( SkipID3Tag, NULL );
+vlc_module_end();
+
+/*****************************************************************************
+ * Definitions of structures  and functions used by this plugins 
+ *****************************************************************************/
+
+
+/****************************************************************************
+ * ParseID3Tag : check if an ID3 header is present and parse and skip it
+ ****************************************************************************
+ *
+ * Author : Sigmund Augdal 
+ * 
+' ****************************************************************************/
+static int SkipID3Tag( vlc_object_t *p_this )
+{
+    input_thread_t *p_input;
+    u8  *p_peek;
+    int i_size;
+    u8  version, revision;
+    int b_footer;
+
+    if ( p_this->i_object_type != VLC_OBJECT_INPUT )
+    {
+        return( VLC_EGENERIC );
+    }
+    p_input = (input_thread_t *)p_this;
+
+    msg_Dbg( p_input, "Checking for ID3 tag" );
+    /* get 10 byte id3 header */    
+    if( input_Peek( p_input, &p_peek, 10 ) < 10 )
+    {
+        msg_Err( p_input, "cannot peek()" );
+        return( VLC_EGENERIC );
+    }
+
+    if ( !( (p_peek[0] == 0x49) && (p_peek[1] == 0x44) && (p_peek[2] == 0x33)))
+    {
+        return( VLC_SUCCESS );
+    }
+    
+    version = p_peek[3];  /* These may become usfull later, */
+    revision = p_peek[4]; /* but we ignore them for now */
+
+    b_footer = p_peek[5] & 0x10;
+    i_size = (p_peek[6] << 21) +
+             (p_peek[7] << 14) +
+             (p_peek[8] << 7) +
+             p_peek[9];
+    if ( b_footer )
+    {
+        i_size += 10;
+    }
+    i_size += 10;
+
+    /* peek the entire tag */
+    if ( input_Peek( p_input, &p_peek, i_size ) < i_size )
+    {
+        msg_Err( p_input, "cannot peek()" );
+        return( VLC_EGENERIC );
+    }
+
+    msg_Dbg( p_input, "ID3 tag found, skiping %d bytes", i_size );
+    p_input->p_current_data += i_size; /* seek passed end of ID3 tag */
+    return ( VLC_SUCCESS );
+}