content/browser/media/flinging_renderer.cc

// Copyright 2018 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.

#include "content/browser/media/flinging_renderer.h"

#include "base/memory/ptr_util.h"
#include "content/browser/frame_host/render_frame_host_delegate.h"
#include "content/browser/frame_host/render_frame_host_impl.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/presentation_service_delegate.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/common/content_client.h"

namespace content {

FlingingRenderer::FlingingRenderer(
    std::unique_ptr<media::FlingingController> controller)
    : controller_(std::move(controller)) {
  controller_->AddMediaStatusObserver(this);
}

FlingingRenderer::~FlingingRenderer() {
  controller_->RemoveMediaStatusObserver(this);
};

// static
std::unique_ptr<FlingingRenderer> FlingingRenderer::Create(
    RenderFrameHost* render_frame_host,
    const std::string& presentation_id) {
  DVLOG(1) << __func__;

  ContentClient* content_client = GetContentClient();
  if (!content_client)
    return nullptr;

  ContentBrowserClient* browser_client = content_client->browser();
  if (!browser_client)
    return nullptr;

  ControllerPresentationServiceDelegate* presentation_delegate =
      browser_client->GetControllerPresentationServiceDelegate(
          static_cast<RenderFrameHostImpl*>(render_frame_host)
              ->delegate()
              ->GetAsWebContents());

  if (!presentation_delegate)
    return nullptr;

  auto flinging_controller = presentation_delegate->GetFlingingController(
      render_frame_host->GetProcess()->GetID(),
      render_frame_host->GetRoutingID(), presentation_id);

  if (!flinging_controller)
    return nullptr;

  return base::WrapUnique<FlingingRenderer>(
      new FlingingRenderer(std::move(flinging_controller)));
}

// media::Renderer implementation
void FlingingRenderer::Initialize(media::MediaResource* media_resource,
                                  media::RendererClient* client,
                                  const media::PipelineStatusCB& init_cb) {
  DVLOG(2) << __func__;
  client_ = client;
  init_cb.Run(media::PIPELINE_OK);
}

void FlingingRenderer::SetCdm(media::CdmContext* cdm_context,
                              const media::CdmAttachedCB& cdm_attached_cb) {
  // The flinging renderer does not support playing encrypted content.
  NOTREACHED();
}

void FlingingRenderer::Flush(const base::Closure& flush_cb) {
  DVLOG(2) << __func__;
  // There is nothing to reset, we can no-op the call.
  flush_cb.Run();
}

void FlingingRenderer::StartPlayingFrom(base::TimeDelta time) {
  DVLOG(2) << __func__;
  controller_->GetMediaController()->Seek(time);

  // After a seek when using the FlingingRenderer, WMPI will never get back to
  // BUFFERING_HAVE_ENOUGH. This prevents Blink from getting the appropriate
  // seek completion signals, and time updates are never re-scheduled.
  //
  // The FlingingRenderer doesn't need to buffer, since playback happens on a
  // different device. This means it's ok to always send BUFFERING_HAVE_ENOUGH
  // when sending buffering state changes. That being said, sending state
  // changes here might be surprising, but the same signals are sent from
  // MediaPlayerRenderer::StartPlayingFrom(), and it has been working mostly
  // smoothly for all HLS playback.
  client_->OnBufferingStateChange(media::BUFFERING_HAVE_ENOUGH);
}

void FlingingRenderer::SetPlaybackRate(double playback_rate) {
  DVLOG(2) << __func__;
  if (playback_rate == 0)
    controller_->GetMediaController()->Pause();
  else
    controller_->GetMediaController()->Play();
}

void FlingingRenderer::SetVolume(float volume) {
  DVLOG(2) << __func__;
  controller_->GetMediaController()->SetVolume(volume);
}

base::TimeDelta FlingingRenderer::GetMediaTime() {
  return controller_->GetApproximateCurrentTime();
}

void FlingingRenderer::OnMediaStatusUpdated(const media::MediaStatus& status) {
  // TODO(tguilbert): propagate important changes to RendererClient.
}

}  // namespace content