video_encoder_metrics_provider.mojom

// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

module media.mojom;

import "ui/gfx/geometry/mojom/geometry.mojom";
import "media/mojo/mojom/media_types.mojom";

// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused. Please keep the consistency with
// VideoEncoderUseCase in tools/metrics/histograms/enums.xml.
enum VideoEncoderUseCase {
  kCastMirroring = 0,
  kMediaRecorder = 1,
  kWebCodecs = 2,
  kWebRTC = 3,
};

// Provider interface to collect video encoder metrics.
interface VideoEncoderMetricsProvider {
  // Initialize() is called whenever the encoder configuration is changed for
  // the encoder whose id is |encoder_id|. This must be called for a new encoder
  // before other calls. Otherwise, the other functions for the encoder is
  // ignored.
  // The UKM about the encoding represented by the previous Initialize() is
  // reported if SetEncodedFrameCount() or SetError() is invoked. See
  // Media.VideoEncoderMetrics in ukm.xml for the detail about the recorded UKM.
  Initialize(uint64 encoder_id, VideoEncoderUseCase encoder_use_case,
             VideoCodecProfile profile, gfx.mojom.Size encode_size,
             bool is_hardware_encoder, SVCScalabilityMode svc_mode);

  // SetEncodedFramesCount() updates the number of successfully encoded frames.
  // |num_encoded_frames| can be any value, but it is bucket by 100 when UKM
  // is recorded.
  SetEncodedFrameCount(uint64 encoder_id, uint64 num_encoded_frames);

  // SetError() should be called when the encoder becomes in the error state. In
  // other words, |status| must not be kOk.
  SetError(uint64 encoder_id, EncoderStatus status);

  // Complete() is called when if the encoder whose id |encoder_id| is no longer
  // used. This may not be called if the encoder is destroyed by destroying
  // the renderer process (e.g. closing the tab).
  Complete(uint64 encoder_id);
};
chromium/media/mojo/mojom/video_encoder_metrics_provider.mojom
