Implement MojoAudioRendererSink and use it in UtilityMojoMediaClient

media/mojo/clients/mojo_audio_renderer_sink_impl.cc

+// 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.
+
+#include "media/mojo/clients/mojo_audio_renderer_sink_impl.h"
+
+#include "media/mojo/common/media_type_converters.h"
+
+namespace media {
+
+MojoAudioRendererSinkImpl::MojoAudioRendererSinkImpl(
+    const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
+    media::AudioRendererSink* sink,
+    mojo::InterfaceRequest<mojom::AudioRendererSink> request)
+    : media_task_runner_(media_task_runner),
+      audio_device_task_runner_(nullptr),
+      binding_(this, std::move(request)),
+      sink_(sink),
+      started_(false) {
+  CHECK(media_task_runner_->BelongsToCurrentThread());
+}
+
+MojoAudioRendererSinkImpl::~MojoAudioRendererSinkImpl() {
+  CHECK(media_task_runner_->BelongsToCurrentThread());
+
+  if (started_) {
+    sink_->Stop();
+    started_ = false;
+  }
+}
+
+int MojoAudioRendererSinkImpl::Render(base::TimeDelta delay,
+                                      base::TimeTicks delay_timestamp,
+                                      int prior_frames_skipped,
+                                      AudioBus* dest) {
+  if (!callback_.is_bound()) {
+    callback_.Bind(std::move(callback_info_));
+
+    if (!audio_device_task_runner_) {
+      audio_device_task_runner_ = base::ThreadTaskRunnerHandle::Get();
+      CHECK(audio_device_task_runner_ != media_task_runner_);
+    }
+  }
+
+  CHECK(audio_device_task_runner_->BelongsToCurrentThread());
+
+  int nb_filled_frames = 0;
+  mojom::AudioBusPtr mojo_audio_bus;
+
+  // Alternative solution is to bind mojom::AudioRendererSinkRenderCallbackPtr
+  // to the audio device thread. Like
+  callback_->Render(delay, delay_timestamp, prior_frames_skipped,
+                    &nb_filled_frames, &mojo_audio_bus);
+
+  callback_info_ = callback_.PassInterface();
+
+  if (!mojo_audio_bus)
+    return 0;
+
+  // TODO(j.isorce): consider using AudioSyncReader once it is mojified.
+  std::unique_ptr<media::AudioBus> audio_bus_wrapper =
+      media::AudioBus::WrapMemory(mojo_audio_bus->nb_channels,
+                                  mojo_audio_bus->nb_frames,
+                                  mojo_audio_bus->data.data());
+  audio_bus_wrapper->CopyTo(dest);
+
+  return nb_filled_frames;
+}
+
+void MojoAudioRendererSinkImpl::OnRenderError() {
+  CHECK(audio_device_task_runner_->BelongsToCurrentThread());
+
+  if (!callback_.is_bound())
+    callback_.Bind(std::move(callback_info_));
+
+  callback_->OnRenderError();
+
+  callback_info_ = callback_.PassInterface();
+}
+
+void MojoAudioRendererSinkImpl::Initialize(
+    const media::AudioParameters& params,
+    mojom::AudioRendererSinkRenderCallbackPtr callback) {
+  CHECK(media_task_runner_->BelongsToCurrentThread());
+  if (callback)
+    callback_info_ = callback.PassInterface();
+  sink_->Initialize(params, this);
+}
+
+void MojoAudioRendererSinkImpl::Start() {
+  CHECK(media_task_runner_->BelongsToCurrentThread());
+  CHECK(!started_);
+
+  started_ = true;
+  sink_->Start();
+}
+
+void MojoAudioRendererSinkImpl::Stop() {
+  CHECK(media_task_runner_->BelongsToCurrentThread());
+  CHECK(started_);
+
+  started_ = false;
+  sink_->Stop();
+}
+
+void MojoAudioRendererSinkImpl::Pause() {
+  CHECK(media_task_runner_->BelongsToCurrentThread());
+  sink_->Pause();
+}
+
+void MojoAudioRendererSinkImpl::Play() {
+  CHECK(media_task_runner_->BelongsToCurrentThread());
+  sink_->Play();
+}
+
+void MojoAudioRendererSinkImpl::SetVolume(double volume,
+                                          const SetVolumeCallback& callback) {
+  CHECK(media_task_runner_->BelongsToCurrentThread());
+  bool success = sink_->SetVolume(volume);
+  callback.Run(success);
+}
+
+void MojoAudioRendererSinkImpl::GetOutputDeviceInfo(
+    const GetOutputDeviceInfoCallback& callback) {
+  CHECK(media_task_runner_->BelongsToCurrentThread());
+  media::OutputDeviceInfo info = sink_->GetOutputDeviceInfo();
+  callback.Run(info);
+}
+
+void MojoAudioRendererSinkImpl::CurrentThreadIsRenderingThread(
+    const CurrentThreadIsRenderingThreadCallback& callback) {
+  CHECK(media_task_runner_->BelongsToCurrentThread());
+  bool is_rendering_thread = sink_->CurrentThreadIsRenderingThread();
+  callback.Run(is_rendering_thread);
+}
+
+}  // namespace media