Merge pull request #30 from kchadha/fix-sound-md5s

fix: fix sound md5s in generated sb2 json

src/squeak/types.js

@@ -1,11 +1,14 @@
 import {CRC32} from '../coders/crc32';
 import {SqueakImage} from '../coders/squeak-image';
 import {SqueakSound} from '../coders/squeak-sound';
+import {WAVFile} from '../coders/wav-file';
 
 import {FieldObject} from './field-object';
 import {value as valueOf} from './fields';
 import {TYPES} from './ids';
 
+import md5 from 'js-md5';
+
 /**
  * @extends FieldObject
  */
@@ -342,6 +345,22 @@ class SoundMediaData extends FieldObject.define({
         return 'pcm';
     }
 
+    get wavEncodedData () {
+        if (!this._wavEncodedData) {
+            this._wavEncodedData = new Uint8Array(WAVFile.encode(this.decoded, {
+                sampleRate: this.rate && this.rate.value
+            }));
+        }
+        return this._wavEncodedData;
+    }
+
+    get md5 () {
+        if (!this._md5) {
+            this._md5 = md5(this.wavEncodedData);
+        }
+        return this._md5;
+    }
+
     toString () {
         return `SoundMediaData "${this.name}"`;
     }

src/to-sb2/fake-zip.js

@@ -1,7 +1,6 @@
 import {assert} from '../util/assert';
 
 import {PNGFile} from '../coders/png-file';
-import {WAVFile} from '../coders/wav-file';
 
 class FakeZipFile {
     constructor (file) {
@@ -49,11 +48,7 @@ const toSb2ImageMedia = imageMedia => {
     return imageMedia.decoded;
 };
 
-const toSb2SoundMedia = soundMedia => (
-    new Uint8Array(WAVFile.encode(soundMedia.decoded, {
-        sampleRate: soundMedia.rate && soundMedia.rate.value
-    }))
-);
+const toSb2SoundMedia = soundMedia => soundMedia.wavEncodedData;
 
 const toSb2FakeZipApi = ({images, sounds}) => {
     const files = {};

src/to-sb2/json-generator.js

@@ -94,7 +94,7 @@ const toSb2Json = root => {
         return {
             soundName: soundMediaData.name,
             soundID,
-            md5: `${md5(soundMediaData.rawBytes)}.wav`,
+            md5: `${soundMediaData.md5}.wav`,
             sampleCount: soundMediaData.sampleCount,
             rate: soundMediaData.rate,
             format: ''