1 /*
2  * libjingle
3  * Copyright 2015 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 #ifndef TALK_APP_WEBRTC_ANDROIDVIDEOCAPTURER_H_
28 #define TALK_APP_WEBRTC_ANDROIDVIDEOCAPTURER_H_
29 
30 #include <string>
31 #include <vector>
32 
33 #include "talk/media/base/videocapturer.h"
34 #include "webrtc/base/thread_checker.h"
35 #include "webrtc/common_video/include/video_frame_buffer.h"
36 
37 namespace webrtc {
38 
39 class AndroidVideoCapturer;
40 
41 class AndroidVideoCapturerDelegate : public rtc::RefCountInterface {
42  public:
~AndroidVideoCapturerDelegate()43   virtual ~AndroidVideoCapturerDelegate() {}
44   // Start capturing. The implementation of the delegate must call
45   // AndroidVideoCapturer::OnCapturerStarted with the result of this request.
46   virtual void Start(int width, int height, int framerate,
47                      AndroidVideoCapturer* capturer) = 0;
48 
49   // Stops capturing.
50   // The delegate may not call into AndroidVideoCapturer after this call.
51   virtual void Stop() = 0;
52 
53   // Must returns a JSON string "{{width=xxx, height=xxx, framerate = xxx}}"
54   virtual std::string GetSupportedFormats() = 0;
55 };
56 
57 // Android implementation of cricket::VideoCapturer for use with WebRtc
58 // PeerConnection.
59 class AndroidVideoCapturer : public cricket::VideoCapturer {
60  public:
61   explicit AndroidVideoCapturer(
62       const rtc::scoped_refptr<AndroidVideoCapturerDelegate>& delegate);
63   virtual ~AndroidVideoCapturer();
64 
65   // Called from JNI when the capturer has been started.
66   void OnCapturerStarted(bool success);
67 
68   // Called from JNI when a new frame has been captured.
69   // Argument |buffer| is intentionally by value, for use with rtc::Bind.
70   void OnIncomingFrame(
71       const rtc::scoped_refptr<webrtc::VideoFrameBuffer>& buffer,
72       int rotation,
73       int64_t time_stamp);
74 
75   // Called from JNI to request a new video format.
76   void OnOutputFormatRequest(int width, int height, int fps);
77 
delegate()78   AndroidVideoCapturerDelegate* delegate() { return delegate_.get(); }
79 
80   // cricket::VideoCapturer implementation.
81   bool GetBestCaptureFormat(const cricket::VideoFormat& desired,
82                             cricket::VideoFormat* best_format) override;
83 
84  private:
85   // cricket::VideoCapturer implementation.
86   // Video frames will be delivered using
87   // cricket::VideoCapturer::SignalFrameCaptured on the thread that calls Start.
88   cricket::CaptureState Start(
89       const cricket::VideoFormat& capture_format) override;
90   void Stop() override;
91   bool IsRunning() override;
IsScreencast()92   bool IsScreencast() const override { return false; }
93   bool GetPreferredFourccs(std::vector<uint32_t>* fourccs) override;
94 
95   bool running_;
96   rtc::scoped_refptr<AndroidVideoCapturerDelegate> delegate_;
97 
98   rtc::ThreadChecker thread_checker_;
99 
100   class FrameFactory;
101   FrameFactory* frame_factory_;  // Owned by cricket::VideoCapturer.
102 
103   cricket::CaptureState current_state_;
104 };
105 
106 }  // namespace webrtc
107 
108 #endif  // TALK_APP_WEBRTC_ANDROIDVIDEOCAPTURER_H_
109