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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef MEDIA_CAST_SENDER_VIDEO_SENDER_H_ | 5 #ifndef MEDIA_CAST_SENDER_VIDEO_SENDER_H_ |
6 #define MEDIA_CAST_SENDER_VIDEO_SENDER_H_ | 6 #define MEDIA_CAST_SENDER_VIDEO_SENDER_H_ |
7 | 7 |
8 #include "base/callback.h" | 8 #include "base/callback.h" |
9 #include "base/memory/ref_counted.h" | 9 #include "base/memory/ref_counted.h" |
10 #include "base/memory/scoped_ptr.h" | 10 #include "base/memory/scoped_ptr.h" |
11 #include "base/memory/weak_ptr.h" | 11 #include "base/memory/weak_ptr.h" |
12 #include "base/threading/non_thread_safe.h" | 12 #include "base/threading/non_thread_safe.h" |
13 #include "base/time/tick_clock.h" | 13 #include "base/time/tick_clock.h" |
14 #include "base/time/time.h" | 14 #include "base/time/time.h" |
15 #include "media/cast/cast_config.h" | 15 #include "media/cast/cast_config.h" |
16 #include "media/cast/cast_environment.h" | |
17 #include "media/cast/logging/logging_defines.h" | |
18 #include "media/cast/net/rtcp/rtcp.h" | |
19 #include "media/cast/sender/congestion_control.h" | 16 #include "media/cast/sender/congestion_control.h" |
20 #include "media/cast/sender/rtp_timestamp_helper.h" | 17 #include "media/cast/sender/frame_sender.h" |
21 | 18 |
22 namespace media { | 19 namespace media { |
23 | 20 |
24 class VideoFrame; | 21 class VideoFrame; |
25 | 22 |
26 namespace cast { | 23 namespace cast { |
27 | 24 |
28 class CastTransportSender; | 25 class CastTransportSender; |
29 class LocalVideoEncoderCallback; | |
30 class VideoEncoder; | 26 class VideoEncoder; |
31 | 27 |
32 // Not thread safe. Only called from the main cast thread. | 28 // Not thread safe. Only called from the main cast thread. |
33 // This class owns all objects related to sending video, objects that create RTP | 29 // This class owns all objects related to sending video, objects that create RTP |
34 // packets, congestion control, video encoder, parsing and sending of | 30 // packets, congestion control, video encoder, parsing and sending of |
35 // RTCP packets. | 31 // RTCP packets. |
36 // Additionally it posts a bunch of delayed tasks to the main thread for various | 32 // Additionally it posts a bunch of delayed tasks to the main thread for various |
37 // timeouts. | 33 // timeouts. |
38 class VideoSender : public RtcpSenderFeedback, | 34 class VideoSender : public FrameSender, |
39 public base::NonThreadSafe, | 35 public base::NonThreadSafe, |
40 public base::SupportsWeakPtr<VideoSender> { | 36 public base::SupportsWeakPtr<VideoSender> { |
41 public: | 37 public: |
42 VideoSender(scoped_refptr<CastEnvironment> cast_environment, | 38 VideoSender(scoped_refptr<CastEnvironment> cast_environment, |
43 const VideoSenderConfig& video_config, | 39 const VideoSenderConfig& video_config, |
44 const CreateVideoEncodeAcceleratorCallback& create_vea_cb, | 40 const CreateVideoEncodeAcceleratorCallback& create_vea_cb, |
45 const CreateVideoEncodeMemoryCallback& create_video_encode_mem_cb, | 41 const CreateVideoEncodeMemoryCallback& create_video_encode_mem_cb, |
46 CastTransportSender* const transport_sender); | 42 CastTransportSender* const transport_sender); |
47 | 43 |
48 virtual ~VideoSender(); | 44 virtual ~VideoSender(); |
49 | 45 |
50 CastInitializationStatus InitializationResult() const { | 46 CastInitializationStatus InitializationResult() const { |
51 return cast_initialization_status_; | 47 return cast_initialization_status_; |
52 } | 48 } |
53 | 49 |
54 // Note: It is not guaranteed that |video_frame| will actually be encoded and | 50 // Note: It is not guaranteed that |video_frame| will actually be encoded and |
55 // sent, if VideoSender detects too many frames in flight. Therefore, clients | 51 // sent, if VideoSender detects too many frames in flight. Therefore, clients |
56 // should be careful about the rate at which this method is called. | 52 // should be careful about the rate at which this method is called. |
57 // | 53 // |
58 // Note: It is invalid to call this method if InitializationResult() returns | 54 // Note: It is invalid to call this method if InitializationResult() returns |
59 // anything but STATUS_VIDEO_INITIALIZED. | 55 // anything but STATUS_VIDEO_INITIALIZED. |
60 void InsertRawVideoFrame(const scoped_refptr<media::VideoFrame>& video_frame, | 56 void InsertRawVideoFrame(const scoped_refptr<media::VideoFrame>& video_frame, |
61 const base::TimeTicks& capture_time); | 57 const base::TimeTicks& capture_time); |
62 | 58 |
63 // Only called from the main cast thread. | |
64 void IncomingRtcpPacket(scoped_ptr<Packet> packet); | |
65 | |
66 protected: | 59 protected: |
67 // Protected for testability. | 60 // Protected for testability. |
68 virtual void OnReceivedCastFeedback(const RtcpCastMessage& cast_feedback) | 61 void OnReceivedCastFeedback(const RtcpCastMessage& cast_feedback); |
69 OVERRIDE; | |
70 | 62 |
71 private: | 63 private: |
72 // Schedule and execute periodic sending of RTCP report. | |
73 void ScheduleNextRtcpReport(); | |
74 void SendRtcpReport(bool schedule_future_reports); | |
75 | |
76 // Schedule and execute periodic checks for re-sending packets. If no | 64 // Schedule and execute periodic checks for re-sending packets. If no |
77 // acknowledgements have been received for "too long," VideoSender will | 65 // acknowledgements have been received for "too long," VideoSender will |
78 // speculatively re-send certain packets of an unacked frame to kick-start | 66 // speculatively re-send certain packets of an unacked frame to kick-start |
79 // re-transmission. This is a last resort tactic to prevent the session from | 67 // re-transmission. This is a last resort tactic to prevent the session from |
80 // getting stuck after a long outage. | 68 // getting stuck after a long outage. |
81 void ScheduleNextResendCheck(); | 69 void ScheduleNextResendCheck(); |
82 void ResendCheck(); | 70 void ResendCheck(); |
83 void ResendForKickstart(); | 71 void ResendForKickstart(); |
84 | 72 |
85 // Returns true if there are too many frames in flight, as defined by the | 73 // Returns true if there are too many frames in flight, as defined by the |
86 // configured target playout delay plus simple logic. When this is true, | 74 // configured target playout delay plus simple logic. When this is true, |
87 // InsertRawVideoFrame() will silenty drop frames instead of sending them to | 75 // InsertRawVideoFrame() will silenty drop frames instead of sending them to |
88 // the video encoder. | 76 // the video encoder. |
89 bool AreTooManyFramesInFlight() const; | 77 bool AreTooManyFramesInFlight() const; |
90 | 78 |
91 // Called by the |video_encoder_| with the next EncodeFrame to send. | 79 // Called by the |video_encoder_| with the next EncodeFrame to send. |
92 void SendEncodedVideoFrame(int requested_bitrate_before_encode, | 80 void SendEncodedVideoFrame(int requested_bitrate_before_encode, |
93 scoped_ptr<EncodedFrame> encoded_frame); | 81 scoped_ptr<EncodedFrame> encoded_frame); |
94 | 82 |
95 const scoped_refptr<CastEnvironment> cast_environment_; | |
96 | |
97 // The total amount of time between a frame's capture/recording on the sender | 83 // The total amount of time between a frame's capture/recording on the sender |
98 // and its playback on the receiver (i.e., shown to a user). This is fixed as | 84 // and its playback on the receiver (i.e., shown to a user). This is fixed as |
99 // a value large enough to give the system sufficient time to encode, | 85 // a value large enough to give the system sufficient time to encode, |
100 // transmit/retransmit, receive, decode, and render; given its run-time | 86 // transmit/retransmit, receive, decode, and render; given its run-time |
101 // environment (sender/receiver hardware performance, network conditions, | 87 // environment (sender/receiver hardware performance, network conditions, |
102 // etc.). | 88 // etc.). |
103 const base::TimeDelta target_playout_delay_; | 89 const base::TimeDelta target_playout_delay_; |
104 | 90 |
105 // Sends encoded frames over the configured transport (e.g., UDP). In | |
106 // Chromium, this could be a proxy that first sends the frames from a renderer | |
107 // process to the browser process over IPC, with the browser process being | |
108 // responsible for "packetizing" the frames and pushing packets into the | |
109 // network layer. | |
110 CastTransportSender* const transport_sender_; | |
111 | |
112 // Maximum number of outstanding frames before the encoding and sending of | 91 // Maximum number of outstanding frames before the encoding and sending of |
113 // new frames shall halt. | 92 // new frames shall halt. |
114 const int max_unacked_frames_; | 93 const int max_unacked_frames_; |
115 | 94 |
116 // Encodes media::VideoFrame images into EncodedFrames. Per configuration, | 95 // Encodes media::VideoFrame images into EncodedFrames. Per configuration, |
117 // this will point to either the internal software-based encoder or a proxy to | 96 // this will point to either the internal software-based encoder or a proxy to |
118 // a hardware-based encoder. | 97 // a hardware-based encoder. |
119 scoped_ptr<VideoEncoder> video_encoder_; | 98 scoped_ptr<VideoEncoder> video_encoder_; |
120 | 99 |
121 // Manages sending/receiving of RTCP packets, including sender/receiver | |
122 // reports. | |
123 Rtcp rtcp_; | |
124 | |
125 // Records lip-sync (i.e., mapping of RTP <--> NTP timestamps), and | |
126 // extrapolates this mapping to any other point in time. | |
127 RtpTimestampHelper rtp_timestamp_helper_; | |
128 | |
129 // Counts how many RTCP reports are being "aggressively" sent (i.e., one per | 100 // Counts how many RTCP reports are being "aggressively" sent (i.e., one per |
130 // frame) at the start of the session. Once a threshold is reached, RTCP | 101 // frame) at the start of the session. Once a threshold is reached, RTCP |
131 // reports are instead sent at the configured interval + random drift. | 102 // reports are instead sent at the configured interval + random drift. |
132 int num_aggressive_rtcp_reports_sent_; | 103 int num_aggressive_rtcp_reports_sent_; |
133 | 104 |
134 // The number of frames currently being processed in |video_encoder_|. | 105 // The number of frames currently being processed in |video_encoder_|. |
135 int frames_in_encoder_; | 106 int frames_in_encoder_; |
136 | 107 |
137 // This is "null" until the first frame is sent. Thereafter, this tracks the | 108 // This is "null" until the first frame is sent. Thereafter, this tracks the |
138 // last time any frame was sent or re-sent. | 109 // last time any frame was sent or re-sent. |
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170 // NOTE: Weak pointers must be invalidated before all other member variables. | 141 // NOTE: Weak pointers must be invalidated before all other member variables. |
171 base::WeakPtrFactory<VideoSender> weak_factory_; | 142 base::WeakPtrFactory<VideoSender> weak_factory_; |
172 | 143 |
173 DISALLOW_COPY_AND_ASSIGN(VideoSender); | 144 DISALLOW_COPY_AND_ASSIGN(VideoSender); |
174 }; | 145 }; |
175 | 146 |
176 } // namespace cast | 147 } // namespace cast |
177 } // namespace media | 148 } // namespace media |
178 | 149 |
179 #endif // MEDIA_CAST_SENDER_VIDEO_SENDER_H_ | 150 #endif // MEDIA_CAST_SENDER_VIDEO_SENDER_H_ |
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