content/browser/media/android/browser_surface_view_manager.cc

// Copyright 2016 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/android/browser_surface_view_manager.h"

#include "base/android/build_info.h"
#include "base/trace_event/trace_event.h"
#include "content/browser/android/content_view_core_impl.h"
#include "content/browser/gpu/gpu_process_host.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/common/media/surface_view_manager_messages_android.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/web_contents_delegate.h"
#include "gpu/ipc/common/gpu_surface_tracker.h"
#include "media/base/surface_manager.h"
#include "ui/gfx/geometry/size.h"

namespace content {
namespace {
void SendDestroyingVideoSurfaceOnIO(int surface_id,
                                    const base::Closure& done_cb) {
  GpuProcessHost* host = GpuProcessHost::Get(
      GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED, false /* force_create */);
  if (host)
    host->SendDestroyingVideoSurface(surface_id, done_cb);
  else
    done_cb.Run();
}
}  // namespace

BrowserSurfaceViewManager::BrowserSurfaceViewManager(
    RenderFrameHost* render_frame_host)
    : render_frame_host_(render_frame_host),
      surface_id_(media::SurfaceManager::kNoSurfaceID) {}

BrowserSurfaceViewManager::~BrowserSurfaceViewManager() {}

void BrowserSurfaceViewManager::SetVideoSurface(gl::ScopedJavaSurface surface) {
  TRACE_EVENT0("media", "BrowserSurfaceViewManager::SetVideoSurface");
  if (surface.IsEmpty()) {
    DCHECK_NE(surface_id_, media::SurfaceManager::kNoSurfaceID);
    gpu::GpuSurfaceTracker::Get()->RemoveSurface(surface_id_);
    SendDestroyingVideoSurface(surface_id_);
    surface_id_ = media::SurfaceManager::kNoSurfaceID;
  } else {
    // We just use the surface tracker to allocate a surface id for us. The
    // lookup will go through the Android specific path and get the java
    // surface directly, so there's no need to add a valid native widget here.
    surface_id_ = gpu::GpuSurfaceTracker::Get()->AddSurfaceForNativeWidget(
        gpu::GpuSurfaceTracker::SurfaceRecord(gfx::kNullAcceleratedWidget,
                                              surface.j_surface().obj()));
    SendSurfaceID(surface_id_);
  }
}

void BrowserSurfaceViewManager::DidExitFullscreen(bool release_media_player) {
  DVLOG(3) << __func__;
  content_video_view_.reset();
}

void BrowserSurfaceViewManager::OnCreateFullscreenSurface(
    const gfx::Size& video_natural_size) {
  // If we are in virtual reality, no surface view is needed so just return.
  // TODO(http://crbug.com/673886): Support overlay surfaces in VR using GVR
  // reprojection video surface.
  RenderWidgetHostViewBase * rwhvb =
      static_cast<RenderWidgetHostViewBase*>(render_frame_host_->GetView());
  if (rwhvb->IsInVR()) {
    SendSurfaceID(media::SurfaceManager::kNoSurfaceID);
    return;
  }

  // It's valid to get this call if we already own the fullscreen view. We just
  // return the existing surface id.
  if (content_video_view_) {
    // Send the surface now if we have it. Otherwise it will be returned by
    // |SetVideoSurface|.
    if (surface_id_ != media::SurfaceManager::kNoSurfaceID) {
      SendSurfaceID(surface_id_);
      OnNaturalSizeChanged(video_natural_size);
      return;
    }
  }

  // If we don't own the fullscreen view, but one exists, it means another
  // WebContents has it. Ignore this request and return a null surface id.
  if (ContentVideoView::GetInstance()) {
    SendSurfaceID(media::SurfaceManager::kNoSurfaceID);
    return;
  }

  WebContents* web_contents =
      WebContents::FromRenderFrameHost(render_frame_host_);
  if (!web_contents->GetDelegate()) {
    SendSurfaceID(media::SurfaceManager::kNoSurfaceID);
    return;
  }
  ContentViewCore* cvc = ContentViewCore::FromWebContents(web_contents);
  content_video_view_.reset(
      new ContentVideoView(this, cvc,
          web_contents->GetDelegate()->GetContentVideoViewEmbedder(),
          video_natural_size));
}

void BrowserSurfaceViewManager::OnNaturalSizeChanged(const gfx::Size& size) {
  if (content_video_view_)
    content_video_view_->OnVideoSizeChanged(size.width(), size.height());
}

bool BrowserSurfaceViewManager::SendSurfaceID(int surface_id) {
  return render_frame_host_->Send(
      new SurfaceViewManagerMsg_FullscreenSurfaceCreated(
          render_frame_host_->GetRoutingID(), surface_id));
}

void BrowserSurfaceViewManager::SendDestroyingVideoSurface(int surface_id) {
  base::WaitableEvent waiter(base::WaitableEvent::ResetPolicy::AUTOMATIC,
                             base::WaitableEvent::InitialState::NOT_SIGNALED);
  // Unretained is okay because we're waiting on the callback.
  if (BrowserThread::PostTask(
          BrowserThread::IO, FROM_HERE,
          base::Bind(&SendDestroyingVideoSurfaceOnIO, surface_id,
                     base::Bind(&base::WaitableEvent::Signal,
                                base::Unretained(&waiter))))) {
    base::ThreadRestrictions::ScopedAllowWait allow_wait;
    waiter.Wait();
  }
}

}  // namespace content