renderer.mojom

// Copyright 2014 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/mojom/demuxer_stream.mojom";
import "media/mojo/mojom/media_types.mojom";
import "mojo/public/mojom/base/time.mojom";
import "mojo/public/mojom/base/unguessable_token.mojom";
import "ui/gfx/geometry/mojom/geometry.mojom";
import "url/mojom/url.mojom";
import "url/mojom/origin.mojom";

// See media/base/media_url_params.h for descriptions.
struct MediaUrlParams {
  url.mojom.Url media_url;
  url.mojom.Url site_for_cookies;
  url.mojom.Origin top_frame_origin;
  bool allow_credentials;
  bool is_hls;
};

interface Renderer {
  // Initializes the Renderer with one or more audio / video |streams|, or a URL
  // via |media_url_params|. Exactly one of |streams| and |media_urls_params|
  // should be set.
  // TODO(sandersd): These should be separate methods or a union type.
  Initialize(associated RendererClient client,
             array<DemuxerStream>? streams,
             MediaUrlParams? media_url_params) => (bool success);

  // Discards any buffered data, executing callback when completed.
  // NOTE: If an error occurs, RendererClient::OnError() can be called
  // before the callback is executed.
  Flush() => ();

  // Starts rendering from |time|.
  StartPlayingFrom(mojo_base.mojom.TimeDelta time);

  // Updates the current playback rate. The default playback rate should be 1.
  SetPlaybackRate(double playback_rate);

  // Sets the output volume. The default volume should be 1.
  SetVolume(float volume);

  // Attaches the CDM associated with |cdm_id| to the renderer service,
  // executing the callback with whether the CDM was successfully attached.
  SetCdm(int32 cdm_id) => (bool success);
};

interface RendererClient {
  // Called to report media time advancement by |time|.
  // |time| and |max_time| can be used to interpolate time between
  // calls to OnTimeUpdate().
  // |max_time| is typically the media timestamp of the last audio frame
  //     buffered by the audio hardware.
  // |capture_time| is monotonic clock time at which the times were captured.
  // |max_time| must be greater or equal to |time|.
  OnTimeUpdate(mojo_base.mojom.TimeDelta time,
               mojo_base.mojom.TimeDelta max_time,
               mojo_base.mojom.TimeTicks capture_time);

  // Called to report buffering state changes, see media_types.mojom.
  OnBufferingStateChange(BufferingState state,
                         BufferingStateChangeReason reason);

  // Executed when rendering has reached the end of stream.
  OnEnded();

  // Executed if any error was encountered during decode or rendering. If
  // this error happens during an operation that has a completion callback,
  // OnError() will be called before firing the completion callback.
  OnError();

  // Executed whenever DemuxerStream status returns kConfigChange. Initial
  // configs provided by OnMetadata.
  OnAudioConfigChange(AudioDecoderConfig config);
  OnVideoConfigChange(VideoDecoderConfig config);

  // Executed for the first video frame and whenever natural size changes.
  OnVideoNaturalSizeChange(gfx.mojom.Size size);

  // Executed for the first video frame and whenever opacity changes.
  OnVideoOpacityChange(bool opaque);

  // Called periodically to pass statistics to the web player. See
  // media_types.mojom.
  OnStatisticsUpdate(PipelineStatistics stats);

  // Called when the remote renderering service is waiting for |reason|,
  // e.g. waiting for decryption key.
  OnWaiting(WaitingReason reason);
};