Cast: Basic cast_receiver API for chrome.

chrome/renderer/media/cast_receiver_session.cc

+// Copyright 2015 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 "chrome/renderer/media/cast_receiver_session.h"
+
+#include "base/synchronization/waitable_event.h"
+#include "chrome/renderer/media/cast_receiver_audio_valve.h"
+#include "content/public/renderer/media_stream_source_api.h"
+#include "content/public/renderer/render_thread.h"
+#include "media/base/audio_capturer_source.h"
+#include "media/base/video_capturer_source.h"
+#include "third_party/WebKit/public/platform/WebMediaStream.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
+
+// This is a render thread object.
+class CastStreamingAudioCapturerSource : public media::AudioCapturerSource {
+ public:
+  CastStreamingAudioCapturerSource(
+      scoped_refptr<CastReceiverSession> cast_receiver_session);
+  void Initialize(const media::AudioParameters& params,
+                  CaptureCallback* callback,
+                  int session_id) override;
+  void Start() override;
+  void Stop() override;
+  void SetVolume(double volume) override;
+  void SetAutomaticGainControl(bool enable) override;
+ private:
+  ~CastStreamingAudioCapturerSource() override;
+  scoped_refptr<CastReceiverSession> cast_receiver_session_;

[miu, 2015/02/11 02:52:49]

nit: const scoped_refptr<...>

[hubbe, 2015/02/11 22:38:17]

Done.

+  scoped_refptr<CastReceiverAudioValve> audio_valve_;
+};
+
+// This is a render thread object.
+class CastStreamingVideoCapturerSource : public media::VideoCapturerSource {
+ public:
+  explicit CastStreamingVideoCapturerSource(
+            scoped_refptr<CastReceiverSession> cast_receiver_session);
+ protected:
+  void GetCurrentSupportedFormats(
+      int max_requested_width,
+      int max_requested_height,
+      double max_requested_frame_rate,
+      const VideoCaptureDeviceFormatsCB& callback) override;
+  void StartCapture(
+      const media::VideoCaptureParams& params,
+      const content::VideoCaptureDeliverFrameCB& frame_callback,
+      scoped_refptr<base::SingleThreadTaskRunner> frame_callback_task_runner,
+      const RunningCallback& running_callback) override;
+  void StopCapture() override;
+ private:
+  scoped_refptr<CastReceiverSession> cast_receiver_session_;

[miu, 2015/02/11 02:52:49]

ditto on const scoped_refptr<...>

[hubbe, 2015/02/11 22:38:16]

Done.

+};
+
+CastReceiverSession::CastReceiverSession()
+    : delegate_(new CastReceiverSessionDelegate()),
+      io_message_loop_proxy_(
+          content::RenderThread::Get()->GetIOMessageLoopProxy()) {}
+
+CastReceiverSession::~CastReceiverSession() {
+  // We should always be able to delete the object on the IO thread.
+  CHECK(io_message_loop_proxy_->DeleteSoon(FROM_HERE, delegate_.release()));
+}
+
+void CastReceiverSession::Start(
+    const media::cast::FrameReceiverConfig& audio_config,
+    const media::cast::FrameReceiverConfig& video_config,
+    const net::IPEndPoint& local_endpoint,
+    const net::IPEndPoint& remote_endpoint,
+    scoped_ptr<base::DictionaryValue> options,
+    const media::VideoCaptureFormat& capture_format,
+    const StartCB& start_callback) {
+  format_ = capture_format;
+  io_message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&CastReceiverSessionDelegate::Start,
+                 base::Unretained(delegate_.get()),
+                 audio_config,
+                 video_config,
+                 local_endpoint,
+                 remote_endpoint,
+                 base::Passed(&options),
+                 format_));
+  blink::WebMediaStreamSource video_source;
+  content::InitializeWebMediaStreamSourceForVideo(
+      make_scoped_ptr(new CastStreamingVideoCapturerSource(this)),
+      &video_source,
+      true,
+      true);
+  blink::WebVector<blink::WebMediaStreamTrack> video_tracks(
+      static_cast<size_t>(1));
+  video_tracks[0].initialize(video_source);
+
+  blink::WebMediaStreamSource audio_source;
+  content::InitializeWebMediaStreamSourceForAudio(
+      new CastStreamingAudioCapturerSource(this),
+      &audio_source,
+      true,
+      true);
+  blink::WebVector<blink::WebMediaStreamTrack> audio_tracks(
+      static_cast<size_t>(1));
+  audio_tracks[0].initialize(audio_source);
+
+  blink::WebMediaStream stream;
+  stream.initialize(audio_tracks, video_tracks);
+
+  base::MessageLoop::current()->PostTask(
+      FROM_HERE,
+      base::Bind(start_callback, stream));
+}
+
+void CastReceiverSession::StartAudio(
+    scoped_refptr<CastReceiverAudioValve> audio_valve) {
+  io_message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&CastReceiverSessionDelegate::StartAudio,
+                 base::Unretained(delegate_.get()),
+                 audio_valve));
+}
+
+void CastReceiverSession::StartVideo(
+    content::VideoCaptureDeliverFrameCB frame_callback) {
+  io_message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&CastReceiverSessionDelegate::StartVideo,
+                 base::Unretained(delegate_.get()),
+                 frame_callback));
+}
+
+void CastReceiverSession::StopVideo() {
+  io_message_loop_proxy_->PostTask(
+      FROM_HERE,
+      base::Bind(&CastReceiverSessionDelegate::StopVideo,
+                 base::Unretained(delegate_.get())));
+}
+
+CastStreamingVideoCapturerSource::CastStreamingVideoCapturerSource(

[miu, 2015/02/11 02:52:49]

Should this class include a destructor with a DCHECK that StopCapture() was
called before destruction?

[hubbe, 2015/02/11 22:38:16]

For video it is actually not relevant if they called StopCapture or not.
Capture will stop, but there may be additional frame callback calls on another
thread either way.

+    scoped_refptr<CastReceiverSession> cast_receiver_session)
+    : cast_receiver_session_(cast_receiver_session) {
+}
+
+void CastStreamingVideoCapturerSource::GetCurrentSupportedFormats(
+    int max_requested_width,
+    int max_requested_height,
+    double max_requested_frame_rate,
+    const VideoCaptureDeviceFormatsCB& callback) {
+  std::vector<media::VideoCaptureFormat> formats;
+  if (cast_receiver_session_->format().IsValid()) {
+    formats.push_back(cast_receiver_session_->format());
+  }
+  callback.Run(formats);
+}
+
+void CastStreamingVideoCapturerSource::StartCapture(
+      const media::VideoCaptureParams& params,
+      const content::VideoCaptureDeliverFrameCB& frame_callback,
+      scoped_refptr<base::SingleThreadTaskRunner> frame_callback_task_runner,
+      const RunningCallback& running_callback) {
+  if (frame_callback_task_runner !=
+      content::RenderThread::Get()->GetIOMessageLoopProxy()) {
+    DCHECK(false) << "Only IO thread supported right now.";
+    running_callback.Run(false);
+    return;
+  }
+  cast_receiver_session_->StartVideo(frame_callback);
+  running_callback.Run(true);
+}
+
+void CastStreamingVideoCapturerSource::StopCapture() {
+  cast_receiver_session_->StopVideo();
+}
+
+CastStreamingAudioCapturerSource::CastStreamingAudioCapturerSource(
+    scoped_refptr<CastReceiverSession> cast_receiver_session)
+    : cast_receiver_session_(cast_receiver_session) {
+}
+
+CastStreamingAudioCapturerSource::~CastStreamingAudioCapturerSource() {}

[miu, 2015/02/11 02:52:49]

Do we need to check that Stop() was called first?

[hubbe, 2015/02/11 22:38:16]

Done.

+
+void CastStreamingAudioCapturerSource::Initialize(
+    const media::AudioParameters& params,
+    CaptureCallback* callback,
+    int session_id) {
+  // TODO(hubbe): Consider converting the audio to whatever the caller wants.
+  if (params.sample_rate() !=
+      cast_receiver_session_->audio_config_.rtp_timebase ||
+      params.channels() != cast_receiver_session_->audio_config_.channels) {
+    callback->OnCaptureError();
+    return;
+  }
+  audio_valve_ = new CastReceiverAudioValve(callback);
+}
+
+void CastStreamingAudioCapturerSource::Start() {
+  cast_receiver_session_->StartAudio(audio_valve_);
+}
+
+void CastStreamingAudioCapturerSource::Stop() {
+  audio_valve_->Stop();
+}
+
+void CastStreamingAudioCapturerSource::SetVolume(double volume) {
+  // not supported
+}
+
+void CastStreamingAudioCapturerSource::SetAutomaticGainControl(bool enable) {
+  // not supported
+}