media: scaffolding and plumbing for MojoRenderer{Impl, Service}

media/mojo/services/mojo_renderer_impl.cc

+// 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.
+
+#include "media/mojo/services/mojo_renderer_impl.h"
+
+#include "base/bind.h"
+#include "base/callback_helpers.h"
+#include "base/single_thread_task_runner.h"
+#include "media/base/demuxer_stream_provider.h"
+#include "media/mojo/services/mojo_demuxer_stream_impl.h"
+#include "mojo/public/cpp/application/connect.h"
+#include "mojo/public/cpp/bindings/interface_impl.h"
+#include "mojo/public/interfaces/application/service_provider.mojom.h"
+
+namespace media {
+
+MojoRendererImpl::MojoRendererImpl(
+    const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
+    DemuxerStreamProvider* demuxer_stream_provider,
+    mojo::ServiceProvider* audio_renderer_provider)
+    : task_runner_(task_runner),
+      demuxer_stream_provider_(demuxer_stream_provider),
+      weak_factory_(this) {
+  // For now we only support audio and there must be a provider.
+  DCHECK(audio_renderer_provider);
+  mojo::ConnectToService(audio_renderer_provider, &remote_audio_renderer_);
+  remote_audio_renderer_.set_client(this);
+}
+
+MojoRendererImpl::~MojoRendererImpl() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  // Connection to |remote_audio_renderer_| will error-out here.
+}
+
+void MojoRendererImpl::Initialize(const base::Closure& init_cb,
+                                  const StatisticsCB& statistics_cb,
+                                  const base::Closure& ended_cb,
+                                  const PipelineStatusCB& error_cb,
+                                  const BufferingStateCB& buffering_state_cb) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  init_cb_ = init_cb;
+  ended_cb_ = ended_cb;
+  error_cb_ = error_cb;
+  buffering_state_cb_ = buffering_state_cb;
+
+  // Create a mojo::DemuxerStream and bind its lifetime to the pipe.
+  mojo::DemuxerStreamPtr demuxer_stream;
+  mojo::BindToProxy(
+      new MojoDemuxerStreamImpl(
+          demuxer_stream_provider_->GetStream(DemuxerStream::AUDIO)),
+      &demuxer_stream);
+  remote_audio_renderer_->Initialize(demuxer_stream.Pass(), init_cb);
+}
+
+void MojoRendererImpl::Flush(const base::Closure& flush_cb) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  remote_audio_renderer_->Flush(flush_cb);
+}
+
+void MojoRendererImpl::StartPlayingFrom(base::TimeDelta time) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  remote_audio_renderer_->StartPlayingFrom(time.InMicroseconds());
+}
+
+void MojoRendererImpl::SetPlaybackRate(float playback_rate) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  remote_audio_renderer_->SetPlaybackRate(playback_rate);
+}
+
+void MojoRendererImpl::SetVolume(float volume) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  remote_audio_renderer_->SetVolume(volume);
+}
+
+base::TimeDelta MojoRendererImpl::GetMediaTime() {
+  NOTIMPLEMENTED();
+  return base::TimeDelta();
+}
+
+bool MojoRendererImpl::HasAudio() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  DCHECK(remote_audio_renderer_.get());  // We always bind the renderer.
+  return true;
+}
+
+bool MojoRendererImpl::HasVideo() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  return false;
+}
+
+void MojoRendererImpl::SetCdm(MediaKeys* cdm) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  NOTIMPLEMENTED();
+}
+
+void MojoRendererImpl::OnTimeUpdate(int64_t time_usec, int64_t max_time_usec) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  NOTIMPLEMENTED();
+}
+
+void MojoRendererImpl::OnBufferingStateChange(mojo::BufferingState state) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  buffering_state_cb_.Run(static_cast<media::BufferingState>(state));
+}
+
+void MojoRendererImpl::OnEnded() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  ended_cb_.Run();
+}
+
+void MojoRendererImpl::OnError() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  // TODO(tim): Should we plumb error code from remote renderer?
+  // http://crbug.com/410451.
+  if (init_cb_.is_null())  // We have initialized already.
+    error_cb_.Run(PIPELINE_ERROR_DECODE);
+  else
+    error_cb_.Run(PIPELINE_ERROR_COULD_NOT_RENDER);
+}
+
+void MojoRendererImpl::OnInitialized() {
+  DCHECK(!init_cb_.is_null());
+  base::ResetAndReturn(&init_cb_).Run();
+}
+
+}  // namespace media