feat!(hls): HLS disabled in old browsers/platforms due to incompatibi…

…lities (#3964)

In Tizen 2/3 and WebOS 3.x there is no support for SourceBuffer.mode=sequence so as a result of change #2337, it necessary disable support for the HLS parser so that the user can at least use the native one with src= .

README.md

@@ -112,6 +112,8 @@ DASH features **not** supported:
 
 ## HLS features
 
+**Only supported on browsers with SourceBuffer.mode=sequence support**
+
 HLS features supported:
  - VOD, Live, and Event types
  - Low-latency streaming with partial segments, preload hints, and delta updates

lib/hls/hls_parser.js

@@ -2497,10 +2497,13 @@ shaka.hls.HlsParser.PresentationType_ = {
   LIVE: 'LIVE',
 };
 
-
-shaka.media.ManifestParser.registerParserByExtension(
-    'm3u8', () => new shaka.hls.HlsParser());
-shaka.media.ManifestParser.registerParserByMime(
-    'application/x-mpegurl', () => new shaka.hls.HlsParser());
-shaka.media.ManifestParser.registerParserByMime(
-    'application/vnd.apple.mpegurl', () => new shaka.hls.HlsParser());
+if (!shaka.util.Platform.isTizen3() &&
+    !shaka.util.Platform.isTizen2() &&
+    !shaka.util.Platform.isWebOS3()) {
+  shaka.media.ManifestParser.registerParserByExtension(
+      'm3u8', () => new shaka.hls.HlsParser());
+  shaka.media.ManifestParser.registerParserByMime(
+      'application/x-mpegurl', () => new shaka.hls.HlsParser());
+  shaka.media.ManifestParser.registerParserByMime(
+      'application/vnd.apple.mpegurl', () => new shaka.hls.HlsParser());
+}

lib/util/platform.js

@@ -142,6 +142,18 @@ shaka.util.Platform = class {
     return shaka.util.Platform.userAgentContains_('Web0S');
   }
 
+  /**
+   * Check if the current platform is a WebOS 3.
+   *
+   * @return {boolean}
+   */
+  static isWebOS3() {
+    // See: http://webostv.developer.lge.com/discover/specifications/web-engine/
+    return shaka.util.Platform.userAgentContains_('Web0S') &&
+        shaka.util.Platform.userAgentContains_(
+            'Chrome/38.0.2125.122 Safari/537.36');
+  }
+
   /**
    * Check if the current platform is a Google Chromecast.
    *