Bug 1882567 - record EME playback info with Glean. r=alwu

Differential Revision: https://phabricator.services.mozilla.com/D204947

dom/media/eme/metrics.yaml

@@ -0,0 +1,42 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Adding a new metric? We have docs for that!
+# https://firefox-source-docs.mozilla.org/toolkit/components/glean/user/new_definitions_file.html
+
+---
+$schema: moz://mozilla.org/schemas/glean/metrics/2-0-0
+$tags:
+  - 'Core :: Audio/Video'
+
+mediadrm:
+  eme_playback:
+    type: event
+    description: >
+      Record the EME play time with the video codec and resolutions.
+    metadata:
+      tags:
+        - 'Core :: Audio/Video: Playback'
+    bugs:
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=1882567
+    data_reviews:
+      - https://bugzilla.mozilla.org/show_bug.cgi?id=1882567#3
+    data_sensitivity:
+      - technical
+    notification_emails:
+      - media-alerts@mozilla.com
+    extra_keys:
+      key_system:
+        description: The key system used for the EME playback
+        type: string
+      played_time:
+        description: How many second the EME content has been played since last record
+        type: quantity
+      resolution:
+        description: The video resolution used for EME playback
+        type: string
+      video_codec:
+        description: The video codec used for EME playback
+        type: string
+    expires: never

dom/media/utils/TelemetryProbesReporter.cpp

@@ -465,6 +465,7 @@ void TelemetryProbesReporter::ReportResultForVideo() {
                           SECONDS_TO_MS(totalVideoPlayTimeS));
   }
 
+  // TODO: deprecate the old probes.
   // Report result for video using CDM
   auto keySystem = mOwner->GetKeySystem();
   if (keySystem) {
@@ -519,6 +520,10 @@ void TelemetryProbesReporter::ReportResultForVideo() {
     ReportResultForMFCDMPlaybackIfNeeded(totalVideoPlayTimeS, key);
   }
 #endif
+  if (keySystem) {
+    ReportPlaytimeForKeySystem(*keySystem, totalVideoPlayTimeS,
+                               info.mVideo.mMimeType, key);
+  }
 }
 
 #ifdef MOZ_WMF_CDM
@@ -564,6 +569,17 @@ void TelemetryProbesReporter::ReportResultForMFCDMPlaybackIfNeeded(
 }
 #endif
 
+void TelemetryProbesReporter::ReportPlaytimeForKeySystem(
+    const nsAString& aKeySystem, const double aTotalPlayTimeS,
+    const nsCString& aCodec, const nsCString& aResolution) {
+  glean::mediadrm::EmePlaybackExtra extra = {
+      .keySystem = Some(NS_ConvertUTF16toUTF8(aKeySystem)),
+      .playedTime = Some(aTotalPlayTimeS),
+      .resolution = Some(aResolution),
+      .videoCodec = Some(aCodec)};
+  glean::mediadrm::eme_playback.Record(Some(extra));
+}
+
 void TelemetryProbesReporter::ReportResultForAudio() {
   // Don't record telemetry for a media that didn't have a valid audio or video
   // to play, or hasn't played.

dom/media/utils/TelemetryProbesReporter.h

@@ -100,7 +100,10 @@ class TelemetryProbesReporter final {
   void ReportResultForMFCDMPlaybackIfNeeded(double aTotalPlayTimeS,
                                             const nsCString& aResolution);
 #endif
-
+  void ReportPlaytimeForKeySystem(const nsAString& aKeySystem,
+                                  const double aTotalPlayTimeS,
+                                  const nsCString& aCodec,
+                                  const nsCString& aResolution);
   // Helper class to measure times for playback telemetry stats
   class TimeDurationAccumulator {
    public:

toolkit/components/glean/metrics_index.py

@@ -18,6 +18,7 @@ gecko_metrics = [
     "browser/base/content/metrics.yaml",
     "docshell/base/metrics.yaml",
     "dom/base/use_counter_metrics.yaml",
+    "dom/media/eme/metrics.yaml",
     "dom/media/hls/metrics.yaml",
     "dom/media/metrics.yaml",
     "dom/media/webrtc/metrics.yaml",