feat: Add a config to dispatch all emsg boxes. (shaka-project#3653)

Closes shaka-project#3348

Author: Álvaro Velad Galván

demo/common/message_ids.js

@@ -167,6 +167,7 @@ shakaDemo.MessageIds = {
   DISABLE_THUMBNAILS: 'DEMO_DISABLE_THUMBNAILS',
   DISABLE_VIDEO: 'DEMO_DISABLE_VIDEO',
   DISABLE_XLINK_PROCESSING: 'DEMO_DISABLE_XLINK_PROCESSING',
+  DISPATCH_ALL_EMSG_BOXES: 'DEMO_DISPATCH_ALL_EMSG_BOXES',
   DRM_RETRY_SECTION_HEADER: 'DEMO_DRM_RETRY_SECTION_HEADER',
   DRM_SECTION_HEADER: 'DEMO_DRM_SECTION_HEADER',
   DRM_SESSION_TYPE: 'DEMO_DRM_SESSION_TYPE',

demo/config.js

@@ -366,7 +366,9 @@ shakaDemo.Config = class {
             'streaming.preferNativeHls')
         .addNumberInput_(MessageIds.UPDATE_INTERVAL_SECONDS,
             'streaming.updateIntervalSeconds',
-            /* canBeDecimal= */ true);
+            /* canBeDecimal= */ true)
+        .addBoolInput_(MessageIds.DISPATCH_ALL_EMSG_BOXES,
+            'streaming.dispatchAllEmsgBoxes');
 
     if (!shakaDemoMain.getNativeControlsEnabled()) {
       this.addBoolInput_(MessageIds.ALWAYS_STREAM_TEXT,

demo/locales/en.json

@@ -58,6 +58,7 @@
   "DEMO_DISABLE_THUMBNAILS": "Disable Thumbnails",
   "DEMO_DISABLE_VIDEO": "Disable Video",
   "DEMO_DISABLE_XLINK_PROCESSING": "Disable Xlink processing",
+  "DEMO_DISPATCH_ALL_EMSG_BOXES": "Dispatch all emsg boxes",
   "DEMO_DOCUMENTATION": "Documentation",
   "DEMO_DRM_RETRY_SECTION_HEADER": "DRM Retry Parameters",
   "DEMO_DRM_SEARCH": "DRM",

demo/locales/source.json

@@ -235,6 +235,10 @@
     "description": "The name of a configuration value.",
     "message": "Disable [JARGON:Xlink] processing"
   },
+  "DEMO_DISPATCH_ALL_EMSG_BOXES": {
+    "description": "The name of a configuration value.",
+    "message": "Dispatch all [JARGON:emsg] boxes"
+  },
   "DEMO_DOCUMENTATION": {
     "description": "A link in the footer, to the Shaka Player documentation.",
     "message": "Documentation"

externs/shaka/player.js

@@ -798,7 +798,8 @@ shaka.extern.ManifestConfiguration;
  *   autoLowLatencyMode: boolean,
  *   forceHTTPS: boolean,
  *   preferNativeHls: boolean,
- *   updateIntervalSeconds: number
+ *   updateIntervalSeconds: number,
+ *   dispatchAllEmsgBoxes: boolean
  * }}
  *
  * @description
@@ -907,6 +908,8 @@ shaka.extern.ManifestConfiguration;
  *   If true, prefer native HLS playback when possible, regardless of platform.
  * @property {number} updateIntervalSeconds
  *   The minimum number of seconds to see if the manifest has changes.
+ * @property {boolean} dispatchAllEmsgBoxes
+ *   If true, all emsg boxes are parsed and dispatched.
  *
  * @exportDoc
  */

lib/media/streaming_engine.js

@@ -1566,7 +1566,9 @@ shaka.media.StreamingEngine = class {
 
     const hasClosedCaptions = stream.closedCaptions &&
         stream.closedCaptions.size > 0;
-    if (stream.emsgSchemeIdUris != null && stream.emsgSchemeIdUris.length > 0) {
+    if ((stream.emsgSchemeIdUris != null &&
+        stream.emsgSchemeIdUris.length > 0) ||
+        this.config_.dispatchAllEmsgBoxes) {
       new shaka.util.Mp4Parser()
           .fullBox(
               'emsg',
@@ -1652,7 +1654,8 @@ shaka.media.StreamingEngine = class {
     // See DASH sec. 5.10.3.3.1
     // If a DASH client detects an event message box with a scheme that is not
     // defined in MPD, the client is expected to ignore it.
-    if (emsgSchemeIdUris.includes(schemeId)) {
+    if (emsgSchemeIdUris.includes(schemeId) ||
+        this.config_.dispatchAllEmsgBoxes) {
       // See DASH sec. 5.10.4.1
       // A special scheme in DASH used to signal manifest updates.
       if (schemeId == 'urn:mpeg:dash:event:2012') {

lib/util/player_configuration.js

@@ -165,6 +165,7 @@ shaka.util.PlayerConfiguration = class {
       forceHTTPS: false,
       preferNativeHls: false,
       updateIntervalSeconds: 1,
+      dispatchAllEmsgBoxes: false,
     };
 
     // Some browsers will stop earlier than others before a gap (e.g., Edge