WIP - WebMediaPlayer switch media renderer.

media/remoting/remoting_controller.cc

Index: media/remoting/remoting_controller.cc
diff --git a/media/remoting/remoting_controller.cc b/media/remoting/remoting_controller.cc
new file mode 100644
index 0000000000000000000000000000000000000000..45d3b7e977bfca2e2ee23e23a204975cc9b59500
--- /dev/null
+++ b/media/remoting/remoting_controller.cc
@@ -0,0 +1,188 @@
+// 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 "media/base/bind_to_current_loop.h"
+
+namespace media {
+
+RemotingController::RemotingController(mojom::RemoterFactory* remoter_factory)
+    : is_fullscreen_(false),
+      is_sink_available_(false),
+      is_remoting_(false),
+      binding_(this),
+      task_runner_(base::ThreadTaskRunnerHandle::Get()) {
+  remoter_factory->Create(binding_.CreateInterfacePtrAndBind(),
+                          mojo::GetProxy(&remoter_));
+}
+
+RemotingController::~RemotingController() {}
+
+void RemotingController::OnSinkAvailable() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  is_sink_available_ = true;
+  Update();
+}
+
+void RemotingController::OnSinkGone() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  is_sink_available_ = false;
+  Update();
+}
+
+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;
+  Update();
+}
+
+void RemotingController::OnExitedFullscreen() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  is_fullscreen_ = false;
+  Update();
+}
+
+void RemotingController::OnSetCdm(CdmContext* cdm_context) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  // TODO(xjz): Not implemented. Will add in up-coming change.
+  NOTIMPLEMENTED();
+}
+
+void RemotingController::SetSwitchRenderCallback(
+    const MediaPlayerObserver::SwitchRendererCallback& cb) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+  DCHECK(!cb.is_null());
+
+  switch_renderer_cb_ = cb;
+}
+
+void RemotingController::OnDecoderConfigChanged(
+    const AudioDecoderConfig& audio_config,
+    const VideoDecoderConfig& video_config) {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  audio_decoder_config_ = audio_config;
+  video_decoder_config_ = video_config;
+  Update();
+}
+
+bool RemotingController::isVideoConfigSupported() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  if (!video_decoder_config_.IsValidConfig())
+    return false;
+
+  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());
+
+  if (!audio_decoder_config_.IsValidConfig())
+    return false;
+
+  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;
+  }
+}
+
+void RemotingController::Update() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  // TODO(xjz): The switching logic for encrypted content will be added in a
+  // later CL.
+
+  bool should_be_remoting =
+      is_sink_available_ && is_fullscreen_ && isVideoConfigSupported() &&
+      isAudioConfigSupported() && !video_decoder_config_.is_encrypted() &&
+      !switch_renderer_cb_.is_null();
+  if (is_remoting_ == should_be_remoting)
+    return;
+
+  // Switch between local and remoting.
+  is_remoting_ = should_be_remoting;
+  if (is_remoting_) {
+    remoter_->Start();
+  } else {
+    switch_renderer_cb_.Run();
+    // TODO(xjz): Send RPC message to notify ChromeCast.

[miu, 2016/09/30 08:12:10]

We shouldn't be talking about Chromecast in Chromium code. This implementation
could be used by any remote device that supports media remoting with the RPC
scheme being implemented in src/media/remoting.

That said, I don't think you need the TODO comment here. By running the
|switch_renderer_cb_|, the RemotingRenderer will be shut down and it can send
the RPC itself.

[xjz, 2016/10/01 00:28:41]

Done.

+    remoter_->Stop(mojom::RemotingStopReason::LOCAL_PLAYBACK);
+  }
+}
+
+bool RemotingController::is_remoting() {
+  DCHECK(task_runner_->BelongsToCurrentThread());
+
+  return is_remoting_;
+}
+
+}  // namespace media