split up the metadata parser

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13637 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 88 insertions, 0 deletions

diff --git a/apps/metadata/sid.c b/apps/metadata/sid.c
new file mode 100644
index 0000000..0dff5f6
--- /dev/null
+++ b/apps/metadata/sid.c
@@ -0,0 +1,88 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2005 Dave Chapman
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <inttypes.h>
+
+#include "system.h"
+#include "id3.h"
+#include "metadata_common.h"
+#include "atoi.h"
+#include "rbunicode.h"
+
+/* PSID metadata info is available here: 
+   http://www.unusedino.de/ec64/technical/formats/sidplay.html */
+bool get_sid_metadata(int fd, struct mp3entry* id3)
+{    
+    /* Use the trackname part of the id3 structure as a temporary buffer */
+    unsigned char* buf = (unsigned char *)id3->path;    
+    int read_bytes;
+    char *p;
+    
+
+    if ((lseek(fd, 0, SEEK_SET) < 0) 
+         || ((read_bytes = read(fd, buf, 0x80)) < 0x80))
+    {
+        return false;
+    }
+    
+    if ((memcmp(buf, "PSID",4) != 0))
+    {
+        return false;
+    }
+
+    p = id3->id3v2buf;
+
+    /* Copy Title (assumed max 0x1f letters + 1 zero byte) */
+    id3->title = p;
+    buf[0x16+0x1f] = 0;
+    p = iso_decode(&buf[0x16], p, 0, strlen(&buf[0x16])+1);
+
+    /* Copy Artist (assumed max 0x1f letters + 1 zero byte) */
+    id3->artist = p;
+    buf[0x36+0x1f] = 0;
+    p = iso_decode(&buf[0x36], p, 0, strlen(&buf[0x36])+1);
+
+    /* Copy Year (assumed max 4 letters + 1 zero byte) */
+    buf[0x56+0x4] = 0;
+    id3->year = atoi(&buf[0x56]);
+
+    /* Copy Album (assumed max 0x1f-0x05 letters + 1 zero byte) */
+    id3->album = p;
+    buf[0x56+0x1f] = 0;
+    p = iso_decode(&buf[0x5b], p, 0, strlen(&buf[0x5b])+1);
+
+    id3->bitrate = 706;
+    id3->frequency = 44100;
+    /* New idea as posted by Marco Alanen (ravon):
+     * Set the songlength in seconds to the number of subsongs
+     * so every second represents a subsong.
+     * Users can then skip the current subsong by seeking
+     *
+     * Note: the number of songs is a 16bit value at 0xE, so this code only
+     * uses the lower 8 bits of the counter.
+    */
+    id3->length = (buf[0xf]-1)*1000;
+    id3->vbr = false;
+    id3->filesize = filesize(fd);
+
+    return true;
+}