1 /*
2  * libjingle
3  * Copyright 2004 Google Inc.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are met:
7  *
8  *  1. Redistributions of source code must retain the above copyright notice,
9  *     this list of conditions and the following disclaimer.
10  *  2. Redistributions in binary form must reproduce the above copyright notice,
11  *     this list of conditions and the following disclaimer in the documentation
12  *     and/or other materials provided with the distribution.
13  *  3. The name of the author may not be used to endorse or promote products
14  *     derived from this software without specific prior written permission.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  */
27 
28 #ifndef TALK_MEDIA_WEBRTCVIDEOCAPTURER_H_
29 #define TALK_MEDIA_WEBRTCVIDEOCAPTURER_H_
30 
31 #ifdef HAVE_WEBRTC_VIDEO
32 
33 #include <string>
34 #include <vector>
35 
36 #include "talk/media/base/videocapturer.h"
37 #include "talk/media/webrtc/webrtcvideoframe.h"
38 #include "webrtc/base/asyncinvoker.h"
39 #include "webrtc/base/messagehandler.h"
40 #include "webrtc/base/scoped_ptr.h"
41 #include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
42 #include "webrtc/modules/video_capture/video_capture.h"
43 
44 namespace cricket {
45 
46 // Factory to allow injection of a VCM impl into WebRtcVideoCapturer.
47 // DeviceInfos do not have a Release() and therefore need an explicit Destroy().
48 class WebRtcVcmFactoryInterface {
49  public:
~WebRtcVcmFactoryInterface()50   virtual ~WebRtcVcmFactoryInterface() {}
51   virtual webrtc::VideoCaptureModule* Create(
52       int id, const char* device) = 0;
53   virtual webrtc::VideoCaptureModule::DeviceInfo* CreateDeviceInfo(int id) = 0;
54   virtual void DestroyDeviceInfo(
55       webrtc::VideoCaptureModule::DeviceInfo* info) = 0;
56 };
57 
58 // WebRTC-based implementation of VideoCapturer.
59 class WebRtcVideoCapturer : public VideoCapturer,
60                             public webrtc::VideoCaptureDataCallback {
61  public:
62   WebRtcVideoCapturer();
63   explicit WebRtcVideoCapturer(WebRtcVcmFactoryInterface* factory);
64   virtual ~WebRtcVideoCapturer();
65 
66   bool Init(const Device& device);
67   bool Init(webrtc::VideoCaptureModule* module);
68 
69   // Override virtual methods of the parent class VideoCapturer.
70   virtual bool GetBestCaptureFormat(const VideoFormat& desired,
71                                     VideoFormat* best_format);
72   virtual CaptureState Start(const VideoFormat& capture_format);
73   virtual void Stop();
74   virtual bool IsRunning();
IsScreencast()75   virtual bool IsScreencast() const { return false; }
76   virtual bool SetApplyRotation(bool enable);
77 
78  protected:
79   // Override virtual methods of the parent class VideoCapturer.
80   virtual bool GetPreferredFourccs(std::vector<uint32_t>* fourccs);
81 
82  private:
83   // Callback when a frame is captured by camera.
84   virtual void OnIncomingCapturedFrame(const int32_t id,
85                                        const webrtc::VideoFrame& frame);
86   virtual void OnCaptureDelayChanged(const int32_t id,
87                                      const int32_t delay);
88 
89   // Used to signal captured frames on the same thread as invoked Start().
90   // With WebRTC's current VideoCapturer implementations, this will mean a
91   // thread hop, but in other implementations (e.g. Chrome) it will be called
92   // directly from OnIncomingCapturedFrame.
93   // TODO(tommi): Remove this workaround when we've updated the WebRTC capturers
94   // to follow the same contract.
95   void SignalFrameCapturedOnStartThread(const webrtc::VideoFrame& frame);
96 
97   rtc::scoped_ptr<WebRtcVcmFactoryInterface> factory_;
98   webrtc::VideoCaptureModule* module_;
99   int captured_frames_;
100   std::vector<uint8_t> capture_buffer_;
101   rtc::Thread* start_thread_;  // Set in Start(), unset in Stop();
102 
103   rtc::scoped_ptr<rtc::AsyncInvoker> async_invoker_;
104 };
105 
106 struct WebRtcCapturedFrame : public CapturedFrame {
107  public:
108   WebRtcCapturedFrame(const webrtc::VideoFrame& frame,
109                       void* buffer,
110                       size_t length);
111 };
112 
113 }  // namespace cricket
114 
115 #endif  // HAVE_WEBRTC_VIDEO
116 #endif  // TALK_MEDIA_WEBRTCVIDEOCAPTURER_H_
117