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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 #include "media/cast/receiver/frame_receiver.h" | 5 #include "media/cast/receiver/frame_receiver.h" |
6 | 6 |
7 #include <algorithm> | 7 #include <algorithm> |
8 | 8 |
9 #include "base/big_endian.h" | 9 #include "base/big_endian.h" |
10 #include "base/bind.h" | 10 #include "base/bind.h" |
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74 EmitAvailableEncodedFrames(); | 74 EmitAvailableEncodedFrames(); |
75 } | 75 } |
76 | 76 |
77 bool FrameReceiver::ProcessPacket(scoped_ptr<Packet> packet) { | 77 bool FrameReceiver::ProcessPacket(scoped_ptr<Packet> packet) { |
78 DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN)); | 78 DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN)); |
79 | 79 |
80 if (Rtcp::IsRtcpPacket(&packet->front(), packet->size())) { | 80 if (Rtcp::IsRtcpPacket(&packet->front(), packet->size())) { |
81 rtcp_.IncomingRtcpPacket(&packet->front(), packet->size()); | 81 rtcp_.IncomingRtcpPacket(&packet->front(), packet->size()); |
82 } else { | 82 } else { |
83 RtpCastHeader rtp_header; | 83 RtpCastHeader rtp_header; |
84 const uint8* payload_data; | 84 const uint8_t* payload_data; |
85 size_t payload_size; | 85 size_t payload_size; |
86 if (!packet_parser_.ParsePacket(&packet->front(), | 86 if (!packet_parser_.ParsePacket(&packet->front(), |
87 packet->size(), | 87 packet->size(), |
88 &rtp_header, | 88 &rtp_header, |
89 &payload_data, | 89 &payload_data, |
90 &payload_size)) { | 90 &payload_size)) { |
91 return false; | 91 return false; |
92 } | 92 } |
93 | 93 |
94 ProcessParsedPacket(rtp_header, payload_data, payload_size); | 94 ProcessParsedPacket(rtp_header, payload_data, payload_size); |
95 stats_.UpdateStatistics(rtp_header); | 95 stats_.UpdateStatistics(rtp_header); |
96 } | 96 } |
97 | 97 |
98 if (!reports_are_scheduled_) { | 98 if (!reports_are_scheduled_) { |
99 ScheduleNextRtcpReport(); | 99 ScheduleNextRtcpReport(); |
100 ScheduleNextCastMessage(); | 100 ScheduleNextCastMessage(); |
101 reports_are_scheduled_ = true; | 101 reports_are_scheduled_ = true; |
102 } | 102 } |
103 | 103 |
104 return true; | 104 return true; |
105 } | 105 } |
106 | 106 |
107 void FrameReceiver::ProcessParsedPacket(const RtpCastHeader& rtp_header, | 107 void FrameReceiver::ProcessParsedPacket(const RtpCastHeader& rtp_header, |
108 const uint8* payload_data, | 108 const uint8_t* payload_data, |
109 size_t payload_size) { | 109 size_t payload_size) { |
110 DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN)); | 110 DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN)); |
111 | 111 |
112 const base::TimeTicks now = cast_environment_->Clock()->NowTicks(); | 112 const base::TimeTicks now = cast_environment_->Clock()->NowTicks(); |
113 | 113 |
114 frame_id_to_rtp_timestamp_[rtp_header.frame_id & 0xff] = | 114 frame_id_to_rtp_timestamp_[rtp_header.frame_id & 0xff] = |
115 rtp_header.rtp_timestamp; | 115 rtp_header.rtp_timestamp; |
116 | 116 |
117 scoped_ptr<PacketEvent> receive_event(new PacketEvent()); | 117 scoped_ptr<PacketEvent> receive_event(new PacketEvent()); |
118 receive_event->timestamp = now; | 118 receive_event->timestamp = now; |
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148 fresh_sync_reference = now; | 148 fresh_sync_reference = now; |
149 } | 149 } |
150 // |lip_sync_reference_time_| is always incremented according to the time | 150 // |lip_sync_reference_time_| is always incremented according to the time |
151 // delta computed from the difference in RTP timestamps. Then, | 151 // delta computed from the difference in RTP timestamps. Then, |
152 // |lip_sync_drift_| accounts for clock drift and also smoothes-out any | 152 // |lip_sync_drift_| accounts for clock drift and also smoothes-out any |
153 // sudden/discontinuous shifts in the series of reference time values. | 153 // sudden/discontinuous shifts in the series of reference time values. |
154 if (lip_sync_reference_time_.is_null()) { | 154 if (lip_sync_reference_time_.is_null()) { |
155 lip_sync_reference_time_ = fresh_sync_reference; | 155 lip_sync_reference_time_ = fresh_sync_reference; |
156 } else { | 156 } else { |
157 lip_sync_reference_time_ += RtpDeltaToTimeDelta( | 157 lip_sync_reference_time_ += RtpDeltaToTimeDelta( |
158 static_cast<int32>(fresh_sync_rtp - lip_sync_rtp_timestamp_), | 158 static_cast<int32_t>(fresh_sync_rtp - lip_sync_rtp_timestamp_), |
159 rtp_timebase_); | 159 rtp_timebase_); |
160 } | 160 } |
161 lip_sync_rtp_timestamp_ = fresh_sync_rtp; | 161 lip_sync_rtp_timestamp_ = fresh_sync_rtp; |
162 lip_sync_drift_.Update( | 162 lip_sync_drift_.Update( |
163 now, fresh_sync_reference - lip_sync_reference_time_); | 163 now, fresh_sync_reference - lip_sync_reference_time_); |
164 } | 164 } |
165 | 165 |
166 // Another frame is complete from a non-duplicate packet. Attempt to emit | 166 // Another frame is complete from a non-duplicate packet. Attempt to emit |
167 // more frames to satisfy enqueued requests. | 167 // more frames to satisfy enqueued requests. |
168 if (complete) | 168 if (complete) |
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295 if (!callback.is_null()) | 295 if (!callback.is_null()) |
296 callback.Run(encoded_frame.Pass()); | 296 callback.Run(encoded_frame.Pass()); |
297 } | 297 } |
298 | 298 |
299 base::TimeTicks FrameReceiver::GetPlayoutTime(const EncodedFrame& frame) const { | 299 base::TimeTicks FrameReceiver::GetPlayoutTime(const EncodedFrame& frame) const { |
300 base::TimeDelta target_playout_delay = target_playout_delay_; | 300 base::TimeDelta target_playout_delay = target_playout_delay_; |
301 if (frame.new_playout_delay_ms) { | 301 if (frame.new_playout_delay_ms) { |
302 target_playout_delay = base::TimeDelta::FromMilliseconds( | 302 target_playout_delay = base::TimeDelta::FromMilliseconds( |
303 frame.new_playout_delay_ms); | 303 frame.new_playout_delay_ms); |
304 } | 304 } |
305 return lip_sync_reference_time_ + | 305 return lip_sync_reference_time_ + lip_sync_drift_.Current() + |
306 lip_sync_drift_.Current() + | 306 RtpDeltaToTimeDelta(static_cast<int32_t>(frame.rtp_timestamp - |
307 RtpDeltaToTimeDelta( | 307 lip_sync_rtp_timestamp_), |
308 static_cast<int32>(frame.rtp_timestamp - lip_sync_rtp_timestamp_), | 308 rtp_timebase_) + |
309 rtp_timebase_) + | 309 target_playout_delay; |
310 target_playout_delay; | |
311 } | 310 } |
312 | 311 |
313 void FrameReceiver::ScheduleNextCastMessage() { | 312 void FrameReceiver::ScheduleNextCastMessage() { |
314 DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN)); | 313 DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN)); |
315 base::TimeTicks send_time; | 314 base::TimeTicks send_time; |
316 framer_.TimeToSendNextCastMessage(&send_time); | 315 framer_.TimeToSendNextCastMessage(&send_time); |
317 base::TimeDelta time_to_send = | 316 base::TimeDelta time_to_send = |
318 send_time - cast_environment_->Clock()->NowTicks(); | 317 send_time - cast_environment_->Clock()->NowTicks(); |
319 time_to_send = std::max( | 318 time_to_send = std::max( |
320 time_to_send, base::TimeDelta::FromMilliseconds(kMinSchedulingDelayMs)); | 319 time_to_send, base::TimeDelta::FromMilliseconds(kMinSchedulingDelayMs)); |
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351 rtcp_.ConvertToNTPAndSave(now), | 350 rtcp_.ConvertToNTPAndSave(now), |
352 NULL, | 351 NULL, |
353 base::TimeDelta(), | 352 base::TimeDelta(), |
354 NULL, | 353 NULL, |
355 &stats); | 354 &stats); |
356 ScheduleNextRtcpReport(); | 355 ScheduleNextRtcpReport(); |
357 } | 356 } |
358 | 357 |
359 } // namespace cast | 358 } // namespace cast |
360 } // namespace media | 359 } // namespace media |
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