split up the metadata parser

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

1 files changed, 92 insertions, 0 deletions

diff --git a/apps/metadata/monkeys.c b/apps/metadata/monkeys.c
new file mode 100644
index 0000000..bda3a01
--- /dev/null
+++ b/apps/metadata/monkeys.c
@@ -0,0 +1,92 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   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"
+
+bool get_monkeys_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;
+    unsigned char* header;
+    bool rc = false;
+    uint32_t descriptorlength;
+    uint32_t totalsamples;
+    uint32_t blocksperframe, finalframeblocks, totalframes;
+    int fileversion;
+
+    lseek(fd, 0, SEEK_SET);
+
+    if (read(fd, buf, 4) < 4)
+    {
+        return rc;
+    }
+    
+    if (memcmp(buf, "MAC ", 4) != 0) 
+    {
+        return rc;
+    }
+
+    read(fd, buf + 4, MAX_PATH - 4);
+
+    fileversion = get_short_le(buf+4);
+    if (fileversion < 3970)
+    {
+        /* Not supported */
+        return false;
+    }
+
+    if (fileversion >= 3980)
+    {
+        descriptorlength = get_long_le(buf+8);
+
+        header = buf + descriptorlength;
+
+        blocksperframe = get_long_le(header+4);
+        finalframeblocks = get_long_le(header+8);
+        totalframes = get_long_le(header+12);
+        id3->frequency = get_long_le(header+20);
+    } 
+    else 
+    {
+        /* v3.95 and later files all have a fixed framesize */
+        blocksperframe = 73728 * 4;
+
+        finalframeblocks = get_long_le(buf+28);
+        totalframes = get_long_le(buf+24);
+        id3->frequency = get_long_le(buf+12);
+    }
+
+    id3->vbr = true;   /* All FLAC files are VBR */
+    id3->filesize = filesize(fd);
+
+    totalsamples = finalframeblocks;
+    if (totalframes > 1)
+        totalsamples += blocksperframe * (totalframes-1);
+
+    id3->length = ((int64_t) totalsamples * 1000) / id3->frequency;
+    id3->bitrate = (id3->filesize * 8) / id3->length;
+    return true;
+}