From 008f39a5f4070332d547ad554088fc23d8936dd2 Mon Sep 17 00:00:00 2001
From: Dylan Muller <dylan.muller@corigine.com>
Date: Tue, 5 Sep 2023 23:37:23 +0200
Subject: emu8910: core: Add demo files

Add demo files.
---
 fym.js | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 fym.js

(limited to 'fym.js')

diff --git a/fym.js b/fym.js
new file mode 100644
index 0000000..8ee4cc3
--- /dev/null
+++ b/fym.js
@@ -0,0 +1,66 @@
+FYMReader = function(buffer) {
+    var psgDump = pako.inflate(new Uint8Array(buffer));
+    var ptr = 0;
+    var frame = 0;
+
+    function getInt() {
+        var r = 0;
+        for(var i = 0; i < 4; i++) r += psgDump[ptr++] << (8*i);
+        return r;
+    }
+
+    function getStr() {
+        var c, r = '';
+        while(c = psgDump[ptr++]) r += String.fromCharCode(c);
+        return r;
+    }
+
+    var offset = getInt();
+
+    var frameCount = getInt();
+    this.getFrameCount = function() {
+        return frameCount;
+    }
+
+    var loopFrame = getInt();
+    this.getLoopFrame = function() {
+        return loopFrame;
+    }
+
+    var clockRate = getInt();
+    this.getClockRate = function() {
+        return clockRate;
+    }
+
+    var frameRate = getInt();
+    this.getFrameRate = function() {
+        return frameRate;
+    }
+
+    var trackName = getStr();
+    this.getTrackName = function() {
+        return trackName;
+    }
+
+    var authorName = getStr();
+    this.getAuthorName = function() {
+        return authorName;
+    }
+
+    var loopCount = 0;
+    this.getLoopCount = function() {
+        return loopCount;
+    }
+
+    this.getNextFrame = function() {
+        var regs = [];
+        for(var r = 0; r < 14; r++) {
+            regs[r] = psgDump[r * frameCount + frame + offset];
+        }
+        if(++frame >= frameCount) {
+            loopCount++;
+            frame = loopFrame;
+        }
+        return regs;
+    }
+}
-- 
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