1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef CONTENT_RENDERER_MEDIA_VIDEO_DESTINATION_HANDLER_H_
6 #define CONTENT_RENDERER_MEDIA_VIDEO_DESTINATION_HANDLER_H_
11 #include "base/compiler_specific.h"
12 #include "base/synchronization/lock.h"
13 #include "content/common/content_export.h"
14 #include "third_party/libjingle/source/talk/media/base/videocapturer.h"
18 class MediaStreamDependencyFactory;
19 class MediaStreamRegistryInterface;
20 class PPB_ImageData_Impl;
22 // Interface used by the effects pepper plugin to output the processed frame
23 // to the video track.
24 class CONTENT_EXPORT FrameWriterInterface {
26 // The ownership of the |image_data| deosn't transfer. So the implementation
27 // of this interface should make a copy of the |image_data| before return.
28 virtual void PutFrame(PPB_ImageData_Impl* image_data,
29 int64 time_stamp_ns) = 0;
30 virtual ~FrameWriterInterface() {}
33 // PpFrameWriter implements cricket::VideoCapturer so that it can be used in
34 // the native video track's video source. It also implements
35 // FrameWriterInterface, which will be used by the effects pepper plugin to
36 // inject the processed frame.
37 class CONTENT_EXPORT PpFrameWriter
38 : public NON_EXPORTED_BASE(cricket::VideoCapturer),
39 public FrameWriterInterface {
42 virtual ~PpFrameWriter();
44 // cricket::VideoCapturer implementation.
45 // These methods are accessed from a libJingle worker thread.
46 virtual cricket::CaptureState Start(
47 const cricket::VideoFormat& capture_format) OVERRIDE;
48 virtual void Stop() OVERRIDE;
49 virtual bool IsRunning() OVERRIDE;
50 virtual bool GetPreferredFourccs(std::vector<uint32>* fourccs) OVERRIDE;
51 virtual bool GetBestCaptureFormat(const cricket::VideoFormat& desired,
52 cricket::VideoFormat* best_format) OVERRIDE;
53 virtual bool IsScreencast() const OVERRIDE;
55 // FrameWriterInterface implementation.
56 // This method will be called by the Pepper host from render thread.
57 virtual void PutFrame(PPB_ImageData_Impl* image_data,
58 int64 time_stamp_ns) OVERRIDE;
62 // |lock_| is used to protect |started_| which will be accessed from different
63 // threads - libjingle worker thread and render thread.
66 DISALLOW_COPY_AND_ASSIGN(PpFrameWriter);
69 // VideoDestinationHandler is a glue class between the webrtc MediaStream and
70 // the effects pepper plugin host.
71 class CONTENT_EXPORT VideoDestinationHandler {
73 // Instantiates and adds a new video track to the MediaStream specified by
74 // |url|. Returns a handler for delivering frames to the new video track as
76 // If |factory| is NULL the MediaStreamDependencyFactory owned by
77 // RenderThreadImpl::current() will be used.
78 // If |registry| is NULL the global blink::WebMediaStreamRegistry will be
79 // used to look up the media stream.
80 // The caller of the function takes the ownership of |frame_writer|.
81 // Returns true on success and false on failure.
82 static bool Open(MediaStreamDependencyFactory* factory,
83 MediaStreamRegistryInterface* registry,
84 const std::string& url,
85 FrameWriterInterface** frame_writer);
88 DISALLOW_COPY_AND_ASSIGN(VideoDestinationHandler);
91 } // namespace content
93 #endif // CONTENT_RENDERER_MEDIA_VIDEO_DESTINATION_HANDLER_H_