Define the interface for MediaStreamVideoSource.

Review URL: https://codereview.chromium.org/99113003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243692 0039d316-1c4b-4281-b951-d872f2087c98

content/content_renderer.gypi

@@ -612,6 +612,8 @@
         'renderer/media/media_stream_registry_interface.h',
         'renderer/media/media_stream_source_observer.cc',
         'renderer/media/media_stream_source_observer.h',
+        'renderer/media/media_stream_video_source.cc',
+        'renderer/media/media_stream_video_source.h',
         'renderer/media/native_handle_impl.cc',
         'renderer/media/native_handle_impl.h',
         'renderer/media/peer_connection_audio_sink_owner.cc',

content/content_tests.gypi

@@ -537,6 +537,7 @@
         'renderer/media/buffered_resource_loader_unittest.cc',
         'renderer/media/cache_util_unittest.cc',
         'renderer/media/crypto/key_systems_unittest.cc',
+        'renderer/media/media_stream_video_source_unittest.cc',
         'renderer/media/test_response_generator.cc',
         'renderer/media/test_response_generator.h',
         'renderer/media/video_capture_impl_unittest.cc',

content/renderer/media/media_stream_video_source.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 "content/renderer/media/media_stream_video_source.h"
+
+#include "base/logging.h"
+#include "content/public/renderer/media_stream_video_sink.h"
+
+namespace content {
+
+void MediaStreamVideoSource::AddTrack(
+    const blink::WebMediaStreamTrack& track,
+    const blink::WebMediaConstraints& constraints) {
+  // TODO(ronghuawu): Put |track| in the registered tracks list. Will later
+  // deliver frames to it according to |constraints|.
+}
+
+void MediaStreamVideoSource::RemoveTrack(
+    const blink::WebMediaStreamTrack& track) {
+  // TODO(ronghuawu): Remove |track| from the list, i.e. will stop delivering
+  // frame to |track|.
+}
+
+void MediaStreamVideoSource::SetReadyState(
+    blink::WebMediaStreamSource::ReadyState state) {
+  // TODO(ronghuawu): Sets WebMediaStreamSource's ready state and notifies the
+  // ready state to all registered tracks.
+}
+
+void MediaStreamVideoSource::DeliverVideoFrame(
+    const scoped_refptr<media::VideoFrame>& frame) {
+  // TODO(ronghuawu): Deliver |frame| to all the registered tracks.
+}
+
+MediaStreamVideoSource::~MediaStreamVideoSource() {
+}
+
+}  // namespace content

content/renderer/media/media_stream_video_source.h

+// 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.
+
+#ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_SOURCE_H_
+#define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_SOURCE_H_
+
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "content/common/content_export.h"
+#include "content/renderer/media/media_stream_source_extra_data.h"
+#include "third_party/WebKit/public/platform/WebMediaConstraints.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
+
+namespace media {
+class VideoFrame;
+}
+
+namespace content {
+
+// MediaStreamVideoSource is an interface used for sending video frames to a
+// MediaStreamVideoTrack.
+// http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+// All methods calls will be done from the main render thread.
+class CONTENT_EXPORT MediaStreamVideoSource
+    : public MediaStreamSourceExtraData {
+ public:
+  // Puts |track| in the registered tracks list. Will later
+  // deliver frames to it according to |constraints|.
+  void AddTrack(const blink::WebMediaStreamTrack& track,
+                const blink::WebMediaConstraints& constraints);
+
+  // Removes |track| from the registered tracks list, i.e. will stop delivering
+  // frame to |track|.
+  void RemoveTrack(const blink::WebMediaStreamTrack& track);
+
+ protected:
+  // Sets ready state and notifies the ready state to all registered tracks.
+  virtual void SetReadyState(blink::WebMediaStreamSource::ReadyState state);
+
+  // Delivers |frame| to registered tracks according to their constraints.
+  virtual void DeliverVideoFrame(const scoped_refptr<media::VideoFrame>& frame);
+
+  virtual ~MediaStreamVideoSource();
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_SOURCE_H_

content/renderer/media/media_stream_video_source_unittest.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 <string>
+
+#include "content/renderer/media/media_stream_video_source.h"
+#include "media/base/video_frame.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+class MediaStreamVideoSourceTest
+    : public ::testing::Test,
+      public MediaStreamVideoSource {
+ public:
+  MediaStreamVideoSourceTest() {}
+};
+
+TEST_F(MediaStreamVideoSourceTest, OnVideoFrame) {
+  blink::WebMediaConstraints constraints;
+  blink::WebMediaStreamTrack track;
+  AddTrack(track, constraints);
+  SetReadyState(blink::WebMediaStreamSource::ReadyStateLive);
+  const int kWidth = 640;
+  const int kHeight = 480;
+  scoped_refptr<media::VideoFrame> frame =
+      media::VideoFrame::CreateBlackFrame(gfx::Size(kWidth, kHeight));
+  ASSERT_TRUE(frame.get());
+  DeliverVideoFrame(frame);
+  SetReadyState(blink::WebMediaStreamSource::ReadyStateEnded);
+  RemoveTrack(track);
+}
+
+}  // namespace content