From 8e5501bf3eab62d18fb8d77daaca06edd3465076 Mon Sep 17 00:00:00 2001
From: FMS-Cat <yutaka.obuchi@gmail.com>
Date: Sun, 4 Apr 2021 05:52:40 +0900
Subject: [PATCH] dev: MusicWrite, best for outputting a wav

---
 package.json              |  2 ++
 src/globals/music.ts      |  2 +-
 src/music/MusicOffline.ts |  2 +-
 src/music/MusicWrite.ts   | 15 +++++++++++++++
 yarn.lock                 | 10 ++++++++++
 5 files changed, 29 insertions(+), 2 deletions(-)
 create mode 100644 src/music/MusicWrite.ts

diff --git a/package.json b/package.json
index 537f1b2..ef40ea0 100644
--- a/package.json
+++ b/package.json
@@ -18,9 +18,11 @@
     "@fms-cat/automaton-with-gui": "^4.1.1",
     "@fms-cat/experimental": "^0.5.0",
     "@fms-cat/glcat-ts": "^0.14.2",
+    "@types/audiobuffer-to-wav": "^1.0.0",
     "@types/webpack-env": "^1.16.0",
     "@typescript-eslint/eslint-plugin": "^4.17.0",
     "@typescript-eslint/parser": "^4.17.0",
+    "audiobuffer-to-wav": "^1.0.0",
     "eslint": "^7.21.0",
     "eslint-plugin-sort-imports-es6-autofix": "^0.6.0",
     "glslify-loader": "^2.0.0",
diff --git a/src/globals/music.ts b/src/globals/music.ts
index 0cf5f1a..e5f2b95 100644
--- a/src/globals/music.ts
+++ b/src/globals/music.ts
@@ -8,7 +8,7 @@ let music: Music;
 
 if ( process.env.DEV ) {
   music = new MusicRealtime();
-  // music = new MusicOffline();
+  // music = new MusicWrite();
 } else {
   music = new MusicOffline();
 }
diff --git a/src/music/MusicOffline.ts b/src/music/MusicOffline.ts
index 48905d0..f165e8e 100644
--- a/src/music/MusicOffline.ts
+++ b/src/music/MusicOffline.ts
@@ -6,7 +6,7 @@ import { gl } from '../globals/canvas';
 const BUFFER_LENGTH = 16384;
 
 export class MusicOffline extends Music {
-  private __buffer: AudioBuffer;
+  protected __buffer: AudioBuffer;
   private __currentBufferSource?: AudioBufferSourceNode | null;
 
   public constructor() {
diff --git a/src/music/MusicWrite.ts b/src/music/MusicWrite.ts
new file mode 100644
index 0000000..7daccd6
--- /dev/null
+++ b/src/music/MusicWrite.ts
@@ -0,0 +1,15 @@
+import { MusicOffline } from './MusicOffline';
+import toWav from 'audiobuffer-to-wav';
+
+export class MusicWrite extends MusicOffline {
+  public async prepare(): Promise<void> {
+    await super.prepare();
+
+    const b = toWav( this.__buffer );
+    const blob = new Blob( [ b ] );
+    const anchor = document.createElement( 'a' );
+    anchor.href = URL.createObjectURL( blob );
+    anchor.download = 'wenis.wav';
+    anchor.click();
+  }
+}
diff --git a/yarn.lock b/yarn.lock
index 3e54740..acc0e62 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -100,6 +100,11 @@
     "@nodelib/fs.scandir" "2.1.4"
     fastq "^1.6.0"
 
+"@types/audiobuffer-to-wav@^1.0.0":
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/@types/audiobuffer-to-wav/-/audiobuffer-to-wav-1.0.0.tgz#4b974f50b96f3f760231b11b2e22dac33b2d2fbf"
+  integrity sha512-SbhLEr/BOWStZ0w9mPJLjUc6REGl+lUsf8M/opXy1jvAFfm+Ontt/8c0KZEvNY+TWy9NO1j/V+32uPCBNExpRg==
+
 "@types/eslint-scope@^3.7.0":
   version "3.7.0"
   resolved "https://registry.yarnpkg.com/@types/eslint-scope/-/eslint-scope-3.7.0.tgz#4792816e31119ebd506902a482caec4951fabd86"
@@ -571,6 +576,11 @@ atob@^2.1.2:
   resolved "https://registry.yarnpkg.com/atob/-/atob-2.1.2.tgz#6d9517eb9e030d2436666651e86bd9f6f13533c9"
   integrity sha512-Wm6ukoaOGJi/73p/cl2GvLjTI5JM1k/O14isD73YML8StrH/7/lRFgmg8nICZgD3bZZvjwCGxtMOD3wWNAu8cg==
 
+audiobuffer-to-wav@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/audiobuffer-to-wav/-/audiobuffer-to-wav-1.0.0.tgz#d5b432271455e7fee56b111cd0f8d620d7f9e105"
+  integrity sha1-1bQyJxRV5/7laxEc0PjWINf54QU=
+
 balanced-match@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"