From b5716df4cb2837bbbc42195cf1aefcf03e21d6a6 Mon Sep 17 00:00:00 2001
From: Sean Bartell <wingedtachikoma@gmail.com>
Date: Fri, 24 Jun 2011 01:25:21 -0400
Subject: Build librbcodec with DSP and metadata.

All associated files are moved to /lib/rbcodec.

Change-Id: I572ddd2b8a996aae1e98c081d06b1ed356dce222
---
 lib/rbcodec/metadata/sgc.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 lib/rbcodec/metadata/sgc.c

(limited to 'lib/rbcodec/metadata/sgc.c')

diff --git a/lib/rbcodec/metadata/sgc.c b/lib/rbcodec/metadata/sgc.c
new file mode 100644
index 0000000000..78cacb9b1b
--- /dev/null
+++ b/lib/rbcodec/metadata/sgc.c
@@ -0,0 +1,67 @@
+#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"
+
+static bool parse_sgc_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, 0xA0) < 0xA0)
+        return false;
+
+    /* calculate track length with number of tracks */
+    id3->length = buf[37] * 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[64], 32); *(p + 33) = '\0';
+    id3->title = p;
+    p += strlen(p)+1;
+
+    /* Artist */
+    memcpy(p, &buf[96], 32); *(p + 33) = '\0';
+    id3->artist = p;
+    p += strlen(p)+1;
+
+    /* Copyright */
+    memcpy(p, &buf[128], 32); *(p + 33) = '\0';
+    id3->album = p;
+    p += strlen(p)+1;
+    return true;
+}
+
+
+bool get_sgc_metadata(int fd, struct mp3entry* id3)
+{
+   uint32_t sgc_type;
+    if ((lseek(fd, 0, SEEK_SET) < 0) ||
+         read_uint32be(fd, &sgc_type) != (int)sizeof(sgc_type))
+        return false;
+
+    id3->vbr = false;
+    id3->filesize = filesize(fd);
+    /* we only render 16 bits, 44.1KHz, Stereo */
+    id3->bitrate = 706;
+    id3->frequency = 44100;
+  
+    /* Make sure this is an SGC file */
+    if (sgc_type != FOURCC('S','G','C',0x1A))
+        return false;
+
+    return parse_sgc_header(fd, id3);
+}
-- 
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