1 files changed, 79 insertions, 0 deletions
diff --git a/mpg123_artsplugin/mpg123/vbrhead.c b/mpg123_artsplugin/mpg123/vbrhead.c
new file mode 100644
index 00000000..f77ab279
--- /dev/null
+++ b/mpg123_artsplugin/mpg123/vbrhead.c
@@ -0,0 +1,79 @@
+/*
+ * This checks for the VBR Header defined by Xing(tm)
+ */
+
+#include "mpg123.h"
+
+static unsigned long get32bits(unsigned char *buf) {
+    unsigned long ret = 0;
+
+    ret = (((unsigned long) buf[0]) << 24) |
+	(((unsigned long) buf[1]) << 16) |
+	(((unsigned long) buf[2]) << 8) |
+	((unsigned long) buf[3]) ;
+
+    return ret;
+}
+
+int getVBRHeader(struct vbrHeader *head,unsigned char *buf, struct frame *fr) 
+{
+    int ssize;
+
+    if(fr->lay != 3)
+	return 0;
+
+    if(fr->lsf)
+	ssize = (fr->stereo == 1) ? 9 : 17;
+    else
+	ssize = (fr->stereo == 1) ? 17 : 32;
+
+
+    buf += ssize;
+
+    if(( buf[0] != 'X' ) || ( buf[1] != 'i' ) ||
+       ( buf[2] != 'n' ) || ( buf[3] != 'g' ) ) 
+	return 0;
+    buf+=4;
+    
+    head->flags = get32bits(buf);
+    buf+=4;
+    
+    if(head->flags & VBR_FRAMES_FLAG) {
+	head->frames = get32bits(buf);
+	buf += 4;
+    }
+
+    if(head->flags & VBR_BYTES_FLAG) {
+	head->bytes  = get32bits(buf); 
+	buf += 4;
+    }
+
+    if(head->flags & VBR_TOC_FLAG) {
+	memcpy(head->toc,buf,100);
+	buf += 100;
+    }
+
+    if(head->flags & VBR_SCALE_FLAG) {
+	head->scale = get32bits(buf);
+	buf += 4;
+    }
+
+    fprintf(stderr,"Found XING %04lx\n",head->flags);
+
+    return 1;
+
+}
+
+
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