1 files changed, 124 insertions, 0 deletions

diff --git a/lib/rbcodec/metadata/adx.c b/lib/rbcodec/metadata/adx.c
new file mode 100644
index 0000000000..7c341b4835
--- /dev/null
+++ b/lib/rbcodec/metadata/adx.c
@@ -0,0 +1,124 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2005 Dave Chapman
+ *
+ * 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 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 "metadata.h"
+#include "metadata_common.h"
+#include "metadata_parsers.h"
+#include "debug.h"
+
+bool get_adx_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 chanstart, channels;
+    int looping = 0, start_adr = 0, end_adr = 0;
+    
+    /* try to get the basic header */
+    if ((lseek(fd, 0, SEEK_SET) < 0)
+        || (read(fd, buf, 0x38) < 0x38))
+    {
+        DEBUGF("lseek or read failed\n");
+        return false;
+    }
+    
+    /* ADX starts with 0x80 */
+    if (buf[0] != 0x80) {
+        DEBUGF("get_adx_metadata: wrong first byte %c\n",buf[0]);
+        return false;
+    }
+    
+    /* check for a reasonable offset */
+    chanstart = ((buf[2] << 8) | buf[3]) + 4;
+    if (chanstart > 4096) {
+        DEBUGF("get_adx_metadata: bad chanstart %i\n", chanstart);
+        return false;
+    }
+
+    /* check for a workable number of channels */
+    channels = buf[7];
+    if (channels != 1 && channels != 2) {
+        DEBUGF("get_adx_metadata: bad channel count %i\n",channels);
+        return false;
+    }
+    
+    id3->frequency = get_long_be(&buf[8]);
+    /* 32 samples per 18 bytes */
+    id3->bitrate = id3->frequency * channels * 18 * 8 / 32 / 1000;
+    id3->length = get_long_be(&buf[12]) / id3->frequency * 1000;
+    id3->vbr = false;
+    id3->filesize = filesize(fd);
+    
+    /* get loop info */
+    if (!memcmp(buf+0x10,"\x01\xF4\x03",3)) {
+        /* Soul Calibur 2 style (type 03) */
+        DEBUGF("get_adx_metadata: type 03 found\n");
+        /* check if header is too small for loop data */
+        if (chanstart-6 < 0x2c) looping=0;
+        else {
+            looping = get_long_be(&buf[0x18]);
+            end_adr = get_long_be(&buf[0x28]);
+            start_adr = get_long_be(&buf[0x1c])/32*channels*18+chanstart;
+        }
+    } else if (!memcmp(buf+0x10,"\x01\xF4\x04",3)) {
+        /* Standard (type 04) */
+        DEBUGF("get_adx_metadata: type 04 found\n");
+        /* check if header is too small for loop data */
+        if (chanstart-6 < 0x38) looping=0;
+        else {
+            looping = get_long_be(&buf[0x24]);
+            end_adr = get_long_be(&buf[0x34]);
+            start_adr = get_long_be(&buf[0x28])/32*channels*18+chanstart;
+        }
+    } else {
+        DEBUGF("get_adx_metadata: error, couldn't determine ADX type\n");
+        return false;
+    }
+    
+    /* is file using encryption */
+    if (buf[0x13]==0x08) {
+        DEBUGF("get_adx_metadata: error, encrypted ADX not supported\n");
+        return false;
+    }
+    
+    if (looping) {
+        /* 2 loops, 10 second fade */
+        id3->length = (start_adr-chanstart + 2*(end_adr-start_adr))
+                      *8 / id3->bitrate + 10000;
+    }
+        
+    /* try to get the channel header */
+    if ((lseek(fd, chanstart-6, SEEK_SET) < 0)
+        || (read(fd, buf, 6) < 6))
+    {
+        return false;
+    }
+    
+    /* check channel header */
+    if (memcmp(buf, "(c)CRI", 6) != 0) return false;
+    
+    return true;    
+}