Media Remoting: Add RemotingController.

media/remoting/remoting_controller.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 "media/remoting/remoting_controller.h"
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "base/single_thread_task_runner.h"
+
+namespace media {
+
+RemotingController::RemotingController(
+    mojom::RemotingSourceRequest source_request,
+    mojom::RemoterPtr remoter)
+    : binding_(this, std::move(source_request)),
+      remoter_(std::move(remoter)),
+      task_runner_(base::ThreadTaskRunnerHandle::Get()),
+      weak_factory_(this) {}
+
+RemotingController::~RemotingController() {}
+
+void RemotingController::OnSinkAvailable() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  is_sink_available_ = true;
+  UpdateAndMaybeSwitch();
+}
+
+void RemotingController::OnSinkGone() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  is_sink_available_ = false;
+  UpdateAndMaybeSwitch();
+}
+
+void RemotingController::OnStarted() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  VLOG(1) << "Remoting started successively.";
+  if (is_remoting_)
+    switch_renderer_cb_.Run();
+  else
+    remoter_->Stop(mojom::RemotingStopReason::LOCAL_PLAYBACK);
+}
+
+void RemotingController::OnStartFailed(mojom::RemotingStartFailReason reason) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  VLOG(1) << "Failed to start remoting:" << reason;
+  is_remoting_ = false;
+}
+
+void RemotingController::OnMessageFromSink(
+    const std::vector<uint8_t>& message) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  // TODO(xjz): Merge with Eric's CL to handle the RPC messages here.
+  NOTIMPLEMENTED();
+}
+
+void RemotingController::OnStopped(mojom::RemotingStopReason reason) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  VLOG(1) << "Remoting stopped: " << reason;
+  is_remoting_ = false;
+}
+
+void RemotingController::OnEnteredFullscreen() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  is_fullscreen_ = true;
+  UpdateAndMaybeSwitch();
+}
+
+void RemotingController::OnExitedFullscreen() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  is_fullscreen_ = false;
+  UpdateAndMaybeSwitch();
+}
+
+void RemotingController::OnSetCdm(CdmContext* cdm_context) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  // TODO(xjz): Not implemented. Will add in up-coming change.
+  NOTIMPLEMENTED();
+}
+
+void RemotingController::SetSwitchRendererCallback(
+    const SwitchRendererCallback& cb) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  DCHECK(!cb.is_null());
+
+  switch_renderer_cb_ = cb;
+}
+
+void RemotingController::OnMetadata(const PipelineMetadata& metadata) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  has_video_ = metadata.has_video;
+  has_audio_ = metadata.has_audio;
+  if (!has_video_ && !has_audio_)
+    return;
+
+  if (has_video_) {
+    DCHECK(metadata.video_decoder_config.IsValidConfig());
+    video_decoder_config_ = metadata.video_decoder_config;
+  }
+  if (has_audio_) {
+    DCHECK(metadata.audio_decoder_config.IsValidConfig());
+    audio_decoder_config_ = metadata.audio_decoder_config;
+  }
+  UpdateAndMaybeSwitch();
+}
+
+bool RemotingController::IsVideoConfigSupported() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  DCHECK(has_video_);
+
+  switch (video_decoder_config_.codec()) {
+    case VideoCodec::kCodecH264:
+    case VideoCodec::kCodecVP8:
+      return true;
+    default:
+      VLOG(2) << "Remoting does not support video codec: "
+              << video_decoder_config_.codec();
+      return false;
+  }
+}
+
+bool RemotingController::IsAudioConfigSupported() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  DCHECK(has_audio_);
+
+  switch (audio_decoder_config_.codec()) {
+    case AudioCodec::kCodecAAC:
+    case AudioCodec::kCodecMP3:
+    case AudioCodec::kCodecPCM:
+    case AudioCodec::kCodecVorbis:
+    case AudioCodec::kCodecFLAC:
+    case AudioCodec::kCodecAMR_NB:
+    case AudioCodec::kCodecAMR_WB:
+    case AudioCodec::kCodecPCM_MULAW:
+    case AudioCodec::kCodecGSM_MS:
+    case AudioCodec::kCodecPCM_S16BE:
+    case AudioCodec::kCodecPCM_S24BE:
+    case AudioCodec::kCodecOpus:
+    case AudioCodec::kCodecEAC3:
+    case AudioCodec::kCodecPCM_ALAW:
+    case AudioCodec::kCodecALAC:
+    case AudioCodec::kCodecAC3:
+      return true;
+    default:
+      VLOG(2) << "Remoting does not support audio codec: "
+              << audio_decoder_config_.codec();
+      return false;
+  }
+}
+
+bool RemotingController::ShouldBeRemoting() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  // TODO(xjz): The control logic for EME will be added in a later CL.
+  if (video_decoder_config_.is_encrypted())

[xhwang, 2016/10/05 05:27:53]

How about make this check part of IsVideoConfigSupported()?

[xjz, 2016/10/05 17:24:23]

I would leave this check here for now. It will change in the later CL when the
control for EME is added. 

[xhwang, 2016/10/05 17:36:41]

Then please at least check |has_video_| before checking
video_decoder_config_.is_encrypted(), otherwise you are relying on the default
value of VideoDecoderConfig, which could be risky.

[xjz, 2016/10/05 23:39:01]

Done.

+    return false;
+  if (audio_decoder_config_.is_encrypted())
+    return false;
+  if (!is_sink_available_)
+    return false;
+  if (!is_fullscreen_)
+    return false;
+  if (has_video_ && !IsVideoConfigSupported())
+    return false;
+  if (has_audio_ && !IsAudioConfigSupported())
+    return false;
+  return true;
+}
+
+void RemotingController::UpdateAndMaybeSwitch() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  // TODO(xjz): The switching logic for encrypted content will be added in a
+  // later CL.
+
+  // Demuxer is not initialized yet.
+  if (!has_audio_ && !has_video_)
+    return;
+
+  DCHECK(!switch_renderer_cb_.is_null());
+
+  bool should_be_remoting = ShouldBeRemoting();
+  if (is_remoting_ == should_be_remoting)
+    return;
+
+  // Switch between local and remoting.
+  is_remoting_ = should_be_remoting;
+  if (is_remoting_) {
+    // |swithc_renderer_cb_.Run()| will be called after remoting is started
+    // successfully.
+    remoter_->Start();
+  } else {
+    switch_renderer_cb_.Run();
+    remoter_->Stop(mojom::RemotingStopReason::LOCAL_PLAYBACK);
+  }
+}
+
+}  // namespace media