From 6700c5f63c0ec1be60f82e9fb072fcade91f1b9d Mon Sep 17 00:00:00 2001
From: mister-ben <git@misterben.me>
Date: Tue, 28 Nov 2023 23:42:19 +0100
Subject: [PATCH] feat: Check for ManagedMediaSource support (#37)

---
 src/codecs.js       | 21 +++++++++++++++++++--
 test/codecs.test.js | 43 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+), 2 deletions(-)

diff --git a/src/codecs.js b/src/codecs.js
index 7974142..a6ba137 100644
--- a/src/codecs.js
+++ b/src/codecs.js
@@ -202,9 +202,26 @@ export const getMimeForCodec = (codecString) => {
   return `${type}/${container};codecs="${codecString}"`;
 };
 
-export const browserSupportsCodec = (codecString = '') => window.MediaSource &&
+/**
+ * Tests whether the codec is supported by MediaSource. Optionally also tests ManagedMediaSource.
+ *
+ * @param {string} codecString
+ *        Codec to test
+ * @param {boolean} [withMMS]
+ *        Whether to check if ManagedMediaSource supports it
+ * @return {boolean}
+ *          Codec is supported
+ */
+export const browserSupportsCodec = (codecString = '', withMMS = false) => (
+  window.MediaSource &&
   window.MediaSource.isTypeSupported &&
-  window.MediaSource.isTypeSupported(getMimeForCodec(codecString)) || false;
+  window.MediaSource.isTypeSupported(getMimeForCodec(codecString))
+) || (
+  withMMS &&
+  window.ManagedMediaSource &&
+  window.ManagedMediaSource.isTypeSupported &&
+  window.ManagedMediaSource.isTypeSupported(getMimeForCodec(codecString))
+) || false;
 
 export const muxerSupportsCodec = (codecString = '') => codecString.toLowerCase().split(',').every((codec) => {
   codec = codec.trim();
diff --git a/test/codecs.test.js b/test/codecs.test.js
index 895bd60..c1c346d 100644
--- a/test/codecs.test.js
+++ b/test/codecs.test.js
@@ -422,9 +422,11 @@ QUnit.test('works as expected', function(assert) {
 QUnit.module('browserSupportsCodec', {
   beforeEach() {
     this.oldMediaSource = window.MediaSource;
+    this.oldManagedMediaSource = window.ManagedMediaSource;
   },
   afterEach() {
     window.MediaSource = this.oldMediaSource;
+    window.ManagedMediaSource = this.oldManagedMediaSource;
   }
 });
 
@@ -442,6 +444,47 @@ QUnit.test('works as expected', function(assert) {
   assert.notOk(browserSupportsCodec('test'), 'no isTypeSupported, browser does not support codec');
 });
 
+QUnit.test('works as expected when ManagedMediaSource supported but checks not requested', function(assert) {
+  window.MediaSource = {isTypeSupported: () => false};
+  window.ManagedMediaSource = {isTypeSupported: () => true};
+  assert.notOk(browserSupportsCodec('test'), 'isTypeSupported false, browser does not support codec, ManangedMediaSource would support, but not requested');
+
+  window.MediaSource = null;
+  window.ManagedMediaSource = {isTypeSupported: () => true};
+  assert.notOk(browserSupportsCodec('test'), 'no MediaSource, browser does not support codec, ManangedMediaSource would support, but not requested');
+
+  window.MediaSource = {isTypeSupported: null};
+  window.ManagedMediaSource = {isTypeSupported: () => true};
+  assert.notOk(browserSupportsCodec('test'), 'no isTypeSupported, browser does not support codec, ManangedMediaSource would support, but not requested');
+});
+
+QUnit.test('works as expected with ManagedMediaSource checks', function(assert) {
+  window.MediaSource = {isTypeSupported: () => false};
+  window.ManagedMediaSource = {isTypeSupported: () => true};
+  assert.ok(browserSupportsCodec('test', true), 'isTypeSupported true, MediaSource does not support codec, but ManangedMediaSource does and was requested');
+
+  window.MediaSource = null;
+  window.ManagedMediaSource = {isTypeSupported: () => true};
+  assert.ok(browserSupportsCodec('test', true), 'isTypeSupported true, no MediaSource, but ManangedMediaSource supports codec and was requested');
+
+  window.MediaSource = {isTypeSupported: null};
+  window.ManagedMediaSource = {isTypeSupported: () => true};
+  assert.ok(browserSupportsCodec('test', true), 'isTypeSupported true, no isTypeSupported on MediaSource, but ManangedMediaSource supports and was requested');
+
+  window.MediaSource = null;
+  window.ManagedMediaSource = {isTypeSupported: () => false};
+  assert.notOk(browserSupportsCodec('test', true), 'isTypeSupported false, no MediaSource and ManagedMediaSource does not support codec');
+
+  window.MediaSource = null;
+  window.ManagedMediaSource = null;
+  assert.notOk(browserSupportsCodec('test', true), 'no MediaSource nor ManagedMediaSource');
+
+  window.MediaSource = null;
+  window.MediaSource = {isTypeSupported: null};
+  assert.notOk(browserSupportsCodec('test', true), 'no isTypeSupported on ManagaedMediaSource, browser does not support codec');
+
+});
+
 QUnit.module('getMimeForCodec');
 
 QUnit.test('works as expected', function(assert) {