media/mojo/interfaces/media_metrics_provider.mojom

// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

module media.mojom;

import "media/mojo/interfaces/media_types.mojom";
import "media/mojo/interfaces/video_decode_stats_recorder.mojom";
import "media/mojo/interfaces/watch_time_recorder.mojom";
import "mojo/public/mojom/base/time.mojom";
import "ui/gfx/geometry/mojo/geometry.mojom";

// Provider interface used to avoid having one time setters on each interface.
// Each recorder will be stamped with an ID which can be used for linking UKM.
interface MediaMetricsProvider {
  // Assigns a playback ID and sets up this provider instance with information
  // needed to make UKM reports. No other methods may be called until after
  // Initialize() has been called.
  Initialize(bool is_mse);

  // Called when a playback ends in error. The status is reported to UKM when
  // the provider is destructed.
  OnError(PipelineStatus status);

  // Setters for various one-time lazily generated metrics or properties.
  SetIsEME();
  SetTimeToMetadata(mojo_base.mojom.TimeDelta elapsed);
  SetTimeToFirstFrame(mojo_base.mojom.TimeDelta elapsed);
  SetTimeToPlayReady(mojo_base.mojom.TimeDelta elapsed);

  // Creates a WatchTimeRecorder instance using |properties|. If any of those
  // properties changes, a new recorder should be requested.
  AcquireWatchTimeRecorder(PlaybackProperties properties,
                           WatchTimeRecorder& recorder);

  // Creates a VideoDecodeStatsRecorder instance.
  AcquireVideoDecodeStatsRecorder(VideoDecodeStatsRecorder& recorder);
};