From acb0917556fc33681c1df5a530cf754193e67705 Mon Sep 17 00:00:00 2001
From: Andree Buschmann <AndreeBuschmann@t-online.de>
Date: Sun, 7 Aug 2011 20:01:04 +0000
Subject: Submit initial patch from FS#12176. Adds support for several new game
 music formats (AY, GBS, HES, KSS, SGC, VGM and VGZ) and replaces the current
 NSF and NSFE with a new implementation based on a port of the Game Music Emu
 library 'GME'. This first submit does not cover the full functionality
 provided by the author's original patch: Coleco-SGV is not supported, some
 GME-specific m3u-support has been removed and IRAM is not used yet. Further
 changes are very likely to follow this submit. Thanks to Mauricio Garrido.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30264 a1c6a512-1295-4272-9138-f99709370657
---
 apps/metadata/gbs.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 apps/metadata/gbs.c

(limited to 'apps/metadata/gbs.c')

diff --git a/apps/metadata/gbs.c b/apps/metadata/gbs.c
new file mode 100644
index 0000000000..796db5932f
--- /dev/null
+++ b/apps/metadata/gbs.c
@@ -0,0 +1,65 @@
+#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 "rbunicode.h"
+
+bool parse_gbs_header(int fd, struct mp3entry* id3)
+{
+    /* Use the trackname part of the id3 structure as a temporary buffer */
+    unsigned char* buf = (unsigned char *)id3->path;
+    lseek(fd, 0, SEEK_SET);
+    if (read(fd, buf, 112) < 112)
+        return false;
+
+    /* Calculate track length with number of subtracks */
+    id3->length = buf[4] * 1000;
+
+    /* If meta info was found in the m3u skip next step */
+    if (id3->title && id3->title[0]) return true;
+    
+    char *p = id3->id3v2buf;
+
+    /* Some metadata entries have 32 bytes length */
+    /* Game */
+    memcpy(p, &buf[16], 32); *(p + 33) = '\0';
+    id3->title = p;
+    p += strlen(p)+1;
+
+    /* Artist */
+    memcpy(p, &buf[48], 32); *(p + 33) = '\0';
+    id3->artist = p;
+    p += strlen(p)+1;
+
+    /* Copyright */
+    memcpy(p, &buf[80], 32); *(p + 33) = '\0';
+    id3->album = p;
+
+    return true;
+}
+
+bool get_gbs_metadata(int fd, struct mp3entry* id3)
+{
+    char gbs_type[3];
+    if ((lseek(fd, 0, SEEK_SET) < 0) ||
+         (read(fd, gbs_type, 3) < 3))
+        return false;
+
+    id3->vbr = false;
+    id3->filesize = filesize(fd);
+    /* we only render 16 bits, 44.1KHz, Stereo */
+    id3->bitrate = 706;
+    id3->frequency = 44100;
+
+    /* Check for GBS magic */
+    if (memcmp( gbs_type, "GBS", 3 ) != 0)
+        return false;
+
+    return parse_gbs_header(fd, id3);
+}
-- 
cgit v1.2.3