Add sam as speech synth

tts/sam/index.js

@@ -0,0 +1,20 @@
+const BaseEngine = require('../BaseEngine')
+const Sam = require('sam-js');
+const wavefile = require('wavefile');
+const fs = require('fs');
+
+module.exports = class extends BaseEngine {
+    constructor() {
+        super('sam', 'Software Automatic Mouth', 'wav')
+    }
+    getDefaultVoice() {
+        return 'en';
+    }
+    async getSpeechFile(text, filepath, voice = this.getDefaultVoice(), params = {}) {
+        let sam = new samjs();
+        const buf = sam.buf8(text);
+        const file = new wavefile.WaveFile();
+        file.fromScratch(1, 22050, 8, buf);
+        fs.writeFileSync(filepath, file.toBuffer());
+    }
+}