Adds MediaStreamSource, MediaStreamAudioSource and MediaStreamVideoCaptureDeviceSource

content/renderer/media/media_stream_video_capture_device_source.h

+// Copyright 2013 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.
+
+#ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_CAPTURE_DEVICE_SOURCE_H_
+#define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_CAPTURE_DEVICE_SOURCE_H_
+
+#include <vector>
+
+#include "base/compiler_specific.h"
+#include "content/common/content_export.h"
+#include "content/renderer/media/media_stream_video_source.h"
+
+namespace content {
+
+// MediaStreamVideoCaptureDeviceSource is an implementation of
+// MediaStreamVideoSource for local video capture.
+// TODO(perkj): Currently, this use RTCVideoCapturer and a libjingle
+// implementation of webrt::MediaStreamSourceInterface. Implement this class
+// without using cricket::VideoCapturer and webrtc::VideoSourceInterface as
+// part of project Piranha Plant.
+class CONTENT_EXPORT MediaStreamVideoCaptureDeviceSource

[Alpha Left Google, 2014/01/15 01:57:47]

It looks like we need an implementation of MediaStreamVideoSource that is based
on libjingle anyway. It's hard that we can remove libjingle dependency in one
step. For example Pepper code still depends on libjingle and
cricket::VideoCapturer to provide video frames.

If so why not just make call this WebRtcMediaStreamVideoSource or something
similar? We can implement a separate class for a local video camera.

[perkj_chrome, 2014/01/16 15:48:08]

What do you mean by pepper in this case? The extension for creating a video
track from pepper? 
My plan is to move the constraints parsing from libjingle into
MediaStreamVideoSource and let MediaStreamVideoCaptureDeviceSource use the
rtc_video_capture_delegate instead of the cricket::VideoCapturer. 

Ronghua landed a patch for MediaStreamVideoSource where a general libjingle
video source is created (that don't care about the constraints or resolution)
that we can use until we have properly implemented the VideoTracks and the
adapters for libjingle. 

+    : public MediaStreamVideoSource,
+      NON_EXPORTED_BASE(public webrtc::ObserverInterface),
+      NON_EXPORTED_BASE(public base::NonThreadSafe) {
+ public:
+  MediaStreamVideoCaptureDeviceSource(const StreamDeviceInfo& device_info,
+                                      const SourceStopCallback& stop_callback,
+                                      MediaStreamDependencyFactory* factory);
+  virtual ~MediaStreamVideoCaptureDeviceSource();
+
+  virtual void ApplyConstraints(const blink::WebMediaStreamTrack& track,
+                                const blink::WebMediaConstraints& constraints,
+                                const ConstraintsCallback& callback) OVERRIDE;
+ protected:
+  // Implements webrtc::Notifier.
+  virtual void OnChanged() OVERRIDE;
+
+ private:
+  void CheckIfWebRtcSourceIsLive();
+
+  bool initializing_;
+  blink::WebMediaConstraints current_constraints_;
+  std::vector<ConstraintsCallback> constraints_callbacks_;
+  DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoCaptureDeviceSource);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_CAPTURE_DEVICE_SOURCE_H_