stefan@webrtc.org | 5f28498 | 2012-06-28 07:51:16 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license |
| 5 | * that can be found in the LICENSE file in the root of the source |
| 6 | * tree. An additional intellectual property rights grant can be found |
| 7 | * in the file PATENTS. All contributing project authors may |
| 8 | * be found in the AUTHORS file in the root of the source tree. |
| 9 | */ |
| 10 | |
Mirko Bonadei | 92ea95e | 2017-09-15 06:47:31 +0200 | [diff] [blame] | 11 | #include "video/stream_synchronization.h" |
stefan@webrtc.org | 7c3523c | 2012-09-11 07:00:42 +0000 | [diff] [blame] | 12 | |
pbos@webrtc.org | f5d4cb1 | 2013-05-17 13:44:48 +0000 | [diff] [blame] | 13 | #include <assert.h> |
stefan@webrtc.org | 47fadba | 2013-11-25 12:03:56 +0000 | [diff] [blame] | 14 | #include <stdlib.h> |
Jonas Olsson | a4d8737 | 2019-07-05 19:08:33 +0200 | [diff] [blame^] | 15 | |
pbos@webrtc.org | 12dc1a3 | 2013-08-05 16:22:53 +0000 | [diff] [blame] | 16 | #include <algorithm> |
stefan@webrtc.org | 7c3523c | 2012-09-11 07:00:42 +0000 | [diff] [blame] | 17 | |
Mirko Bonadei | 92ea95e | 2017-09-15 06:47:31 +0200 | [diff] [blame] | 18 | #include "rtc_base/logging.h" |
stefan@webrtc.org | 5f28498 | 2012-06-28 07:51:16 +0000 | [diff] [blame] | 19 | |
| 20 | namespace webrtc { |
| 21 | |
pwestin@webrtc.org | 6311733 | 2013-04-22 18:57:14 +0000 | [diff] [blame] | 22 | static const int kMaxChangeMs = 80; |
| 23 | static const int kMaxDeltaDelayMs = 10000; |
| 24 | static const int kFilterLength = 4; |
| 25 | // Minimum difference between audio and video to warrant a change. |
| 26 | static const int kMinDeltaMs = 30; |
stefan@webrtc.org | 5f28498 | 2012-06-28 07:51:16 +0000 | [diff] [blame] | 27 | |
solenberg | 3ebbcb5 | 2017-01-31 03:58:40 -0800 | [diff] [blame] | 28 | StreamSynchronization::StreamSynchronization(int video_stream_id, |
| 29 | int audio_stream_id) |
| 30 | : video_stream_id_(video_stream_id), |
| 31 | audio_stream_id_(audio_stream_id), |
pwestin@webrtc.org | 6311733 | 2013-04-22 18:57:14 +0000 | [diff] [blame] | 32 | base_target_delay_ms_(0), |
Yves Gerey | 665174f | 2018-06-19 15:03:05 +0200 | [diff] [blame] | 33 | avg_diff_ms_(0) {} |
stefan@webrtc.org | 5f28498 | 2012-06-28 07:51:16 +0000 | [diff] [blame] | 34 | |
stefan@webrtc.org | 7c3523c | 2012-09-11 07:00:42 +0000 | [diff] [blame] | 35 | bool StreamSynchronization::ComputeRelativeDelay( |
| 36 | const Measurements& audio_measurement, |
| 37 | const Measurements& video_measurement, |
| 38 | int* relative_delay_ms) { |
| 39 | assert(relative_delay_ms); |
stefan@webrtc.org | 7c3523c | 2012-09-11 07:00:42 +0000 | [diff] [blame] | 40 | int64_t audio_last_capture_time_ms; |
asapersson | fe50b4d | 2016-12-22 07:53:51 -0800 | [diff] [blame] | 41 | if (!audio_measurement.rtp_to_ntp.Estimate(audio_measurement.latest_timestamp, |
| 42 | &audio_last_capture_time_ms)) { |
stefan@webrtc.org | 7c3523c | 2012-09-11 07:00:42 +0000 | [diff] [blame] | 43 | return false; |
| 44 | } |
| 45 | int64_t video_last_capture_time_ms; |
asapersson | fe50b4d | 2016-12-22 07:53:51 -0800 | [diff] [blame] | 46 | if (!video_measurement.rtp_to_ntp.Estimate(video_measurement.latest_timestamp, |
| 47 | &video_last_capture_time_ms)) { |
stefan@webrtc.org | 7c3523c | 2012-09-11 07:00:42 +0000 | [diff] [blame] | 48 | return false; |
| 49 | } |
| 50 | if (video_last_capture_time_ms < 0) { |
| 51 | return false; |
| 52 | } |
| 53 | // Positive diff means that video_measurement is behind audio_measurement. |
Yves Gerey | 665174f | 2018-06-19 15:03:05 +0200 | [diff] [blame] | 54 | *relative_delay_ms = |
| 55 | video_measurement.latest_receive_time_ms - |
stefan@webrtc.org | 7c3523c | 2012-09-11 07:00:42 +0000 | [diff] [blame] | 56 | audio_measurement.latest_receive_time_ms - |
| 57 | (video_last_capture_time_ms - audio_last_capture_time_ms); |
mikhal@webrtc.org | ef9f76a | 2013-02-15 23:22:18 +0000 | [diff] [blame] | 58 | if (*relative_delay_ms > kMaxDeltaDelayMs || |
| 59 | *relative_delay_ms < -kMaxDeltaDelayMs) { |
stefan@webrtc.org | 7c3523c | 2012-09-11 07:00:42 +0000 | [diff] [blame] | 60 | return false; |
| 61 | } |
| 62 | return true; |
| 63 | } |
stefan@webrtc.org | 5f28498 | 2012-06-28 07:51:16 +0000 | [diff] [blame] | 64 | |
stefan@webrtc.org | 7c3523c | 2012-09-11 07:00:42 +0000 | [diff] [blame] | 65 | bool StreamSynchronization::ComputeDelays(int relative_delay_ms, |
| 66 | int current_audio_delay_ms, |
turaj@webrtc.org | e46c8d3 | 2013-05-22 20:39:43 +0000 | [diff] [blame] | 67 | int* total_audio_delay_target_ms, |
stefan@webrtc.org | 7c3523c | 2012-09-11 07:00:42 +0000 | [diff] [blame] | 68 | int* total_video_delay_target_ms) { |
turaj@webrtc.org | e46c8d3 | 2013-05-22 20:39:43 +0000 | [diff] [blame] | 69 | assert(total_audio_delay_target_ms && total_video_delay_target_ms); |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 70 | |
| 71 | int current_video_delay_ms = *total_video_delay_target_ms; |
Mirko Bonadei | 675513b | 2017-11-09 11:09:25 +0100 | [diff] [blame] | 72 | RTC_LOG(LS_VERBOSE) << "Audio delay: " << current_audio_delay_ms |
| 73 | << " current diff: " << relative_delay_ms |
| 74 | << " for stream " << audio_stream_id_; |
stefan@webrtc.org | 5f28498 | 2012-06-28 07:51:16 +0000 | [diff] [blame] | 75 | // Calculate the difference between the lowest possible video delay and |
| 76 | // the current audio delay. |
Yves Gerey | 665174f | 2018-06-19 15:03:05 +0200 | [diff] [blame] | 77 | int current_diff_ms = |
| 78 | current_video_delay_ms - current_audio_delay_ms + relative_delay_ms; |
stefan@webrtc.org | 5f28498 | 2012-06-28 07:51:16 +0000 | [diff] [blame] | 79 | |
Yves Gerey | 665174f | 2018-06-19 15:03:05 +0200 | [diff] [blame] | 80 | avg_diff_ms_ = |
| 81 | ((kFilterLength - 1) * avg_diff_ms_ + current_diff_ms) / kFilterLength; |
pwestin@webrtc.org | 6311733 | 2013-04-22 18:57:14 +0000 | [diff] [blame] | 82 | if (abs(avg_diff_ms_) < kMinDeltaMs) { |
| 83 | // Don't adjust if the diff is within our margin. |
| 84 | return false; |
| 85 | } |
| 86 | |
| 87 | // Make sure we don't move too fast. |
| 88 | int diff_ms = avg_diff_ms_ / 2; |
| 89 | diff_ms = std::min(diff_ms, kMaxChangeMs); |
| 90 | diff_ms = std::max(diff_ms, -kMaxChangeMs); |
| 91 | |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 92 | // Reset the average after a move to prevent overshooting reaction. |
| 93 | avg_diff_ms_ = 0; |
| 94 | |
pwestin@webrtc.org | 6311733 | 2013-04-22 18:57:14 +0000 | [diff] [blame] | 95 | if (diff_ms > 0) { |
stefan@webrtc.org | 5f28498 | 2012-06-28 07:51:16 +0000 | [diff] [blame] | 96 | // The minimum video delay is longer than the current audio delay. |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 97 | // We need to decrease extra video delay, or add extra audio delay. |
mflodman | 4cd2790 | 2016-08-05 06:28:45 -0700 | [diff] [blame] | 98 | if (channel_delay_.extra_video_delay_ms > base_target_delay_ms_) { |
stefan@webrtc.org | 5f28498 | 2012-06-28 07:51:16 +0000 | [diff] [blame] | 99 | // We have extra delay added to ViE. Reduce this delay before adding |
| 100 | // extra delay to VoE. |
mflodman | 4cd2790 | 2016-08-05 06:28:45 -0700 | [diff] [blame] | 101 | channel_delay_.extra_video_delay_ms -= diff_ms; |
| 102 | channel_delay_.extra_audio_delay_ms = base_target_delay_ms_; |
| 103 | } else { // channel_delay_.extra_video_delay_ms > 0 |
stefan@webrtc.org | 5f28498 | 2012-06-28 07:51:16 +0000 | [diff] [blame] | 104 | // We have no extra video delay to remove, increase the audio delay. |
mflodman | 4cd2790 | 2016-08-05 06:28:45 -0700 | [diff] [blame] | 105 | channel_delay_.extra_audio_delay_ms += diff_ms; |
| 106 | channel_delay_.extra_video_delay_ms = base_target_delay_ms_; |
stefan@webrtc.org | 5f28498 | 2012-06-28 07:51:16 +0000 | [diff] [blame] | 107 | } |
pwestin@webrtc.org | 6311733 | 2013-04-22 18:57:14 +0000 | [diff] [blame] | 108 | } else { // if (diff_ms > 0) |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 109 | // The video delay is lower than the current audio delay. |
| 110 | // We need to decrease extra audio delay, or add extra video delay. |
mflodman | 4cd2790 | 2016-08-05 06:28:45 -0700 | [diff] [blame] | 111 | if (channel_delay_.extra_audio_delay_ms > base_target_delay_ms_) { |
mikhal@webrtc.org | ef9f76a | 2013-02-15 23:22:18 +0000 | [diff] [blame] | 112 | // We have extra delay in VoiceEngine. |
| 113 | // Start with decreasing the voice delay. |
pwestin@webrtc.org | 6311733 | 2013-04-22 18:57:14 +0000 | [diff] [blame] | 114 | // Note: diff_ms is negative; add the negative difference. |
mflodman | 4cd2790 | 2016-08-05 06:28:45 -0700 | [diff] [blame] | 115 | channel_delay_.extra_audio_delay_ms += diff_ms; |
| 116 | channel_delay_.extra_video_delay_ms = base_target_delay_ms_; |
| 117 | } else { // channel_delay_.extra_audio_delay_ms > base_target_delay_ms_ |
stefan@webrtc.org | 5f28498 | 2012-06-28 07:51:16 +0000 | [diff] [blame] | 118 | // We have no extra delay in VoiceEngine, increase the video delay. |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 119 | // Note: diff_ms is negative; subtract the negative difference. |
mflodman | 4cd2790 | 2016-08-05 06:28:45 -0700 | [diff] [blame] | 120 | channel_delay_.extra_video_delay_ms -= diff_ms; // X - (-Y) = X + Y. |
| 121 | channel_delay_.extra_audio_delay_ms = base_target_delay_ms_; |
stefan@webrtc.org | 5f28498 | 2012-06-28 07:51:16 +0000 | [diff] [blame] | 122 | } |
| 123 | } |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 124 | |
| 125 | // Make sure that video is never below our target. |
Yves Gerey | 665174f | 2018-06-19 15:03:05 +0200 | [diff] [blame] | 126 | channel_delay_.extra_video_delay_ms = |
| 127 | std::max(channel_delay_.extra_video_delay_ms, base_target_delay_ms_); |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 128 | |
| 129 | int new_video_delay_ms; |
mflodman | 4cd2790 | 2016-08-05 06:28:45 -0700 | [diff] [blame] | 130 | if (channel_delay_.extra_video_delay_ms > base_target_delay_ms_) { |
| 131 | new_video_delay_ms = channel_delay_.extra_video_delay_ms; |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 132 | } else { |
| 133 | // No change to the extra video delay. We are changing audio and we only |
| 134 | // allow to change one at the time. |
mflodman | 4cd2790 | 2016-08-05 06:28:45 -0700 | [diff] [blame] | 135 | new_video_delay_ms = channel_delay_.last_video_delay_ms; |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 136 | } |
| 137 | |
| 138 | // Make sure that we don't go below the extra video delay. |
Yves Gerey | 665174f | 2018-06-19 15:03:05 +0200 | [diff] [blame] | 139 | new_video_delay_ms = |
| 140 | std::max(new_video_delay_ms, channel_delay_.extra_video_delay_ms); |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 141 | |
| 142 | // Verify we don't go above the maximum allowed video delay. |
| 143 | new_video_delay_ms = |
| 144 | std::min(new_video_delay_ms, base_target_delay_ms_ + kMaxDeltaDelayMs); |
| 145 | |
turaj@webrtc.org | e46c8d3 | 2013-05-22 20:39:43 +0000 | [diff] [blame] | 146 | int new_audio_delay_ms; |
mflodman | 4cd2790 | 2016-08-05 06:28:45 -0700 | [diff] [blame] | 147 | if (channel_delay_.extra_audio_delay_ms > base_target_delay_ms_) { |
| 148 | new_audio_delay_ms = channel_delay_.extra_audio_delay_ms; |
turaj@webrtc.org | e46c8d3 | 2013-05-22 20:39:43 +0000 | [diff] [blame] | 149 | } else { |
| 150 | // No change to the audio delay. We are changing video and we only |
| 151 | // allow to change one at the time. |
mflodman | 4cd2790 | 2016-08-05 06:28:45 -0700 | [diff] [blame] | 152 | new_audio_delay_ms = channel_delay_.last_audio_delay_ms; |
turaj@webrtc.org | e46c8d3 | 2013-05-22 20:39:43 +0000 | [diff] [blame] | 153 | } |
| 154 | |
| 155 | // Make sure that we don't go below the extra audio delay. |
Yves Gerey | 665174f | 2018-06-19 15:03:05 +0200 | [diff] [blame] | 156 | new_audio_delay_ms = |
| 157 | std::max(new_audio_delay_ms, channel_delay_.extra_audio_delay_ms); |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 158 | |
| 159 | // Verify we don't go above the maximum allowed audio delay. |
turaj@webrtc.org | e46c8d3 | 2013-05-22 20:39:43 +0000 | [diff] [blame] | 160 | new_audio_delay_ms = |
| 161 | std::min(new_audio_delay_ms, base_target_delay_ms_ + kMaxDeltaDelayMs); |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 162 | |
turaj@webrtc.org | e46c8d3 | 2013-05-22 20:39:43 +0000 | [diff] [blame] | 163 | // Remember our last audio and video delays. |
mflodman | 4cd2790 | 2016-08-05 06:28:45 -0700 | [diff] [blame] | 164 | channel_delay_.last_video_delay_ms = new_video_delay_ms; |
| 165 | channel_delay_.last_audio_delay_ms = new_audio_delay_ms; |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 166 | |
Mirko Bonadei | 675513b | 2017-11-09 11:09:25 +0100 | [diff] [blame] | 167 | RTC_LOG(LS_VERBOSE) << "Sync video delay " << new_video_delay_ms |
| 168 | << " for video stream " << video_stream_id_ |
| 169 | << " and audio delay " |
| 170 | << channel_delay_.extra_audio_delay_ms |
| 171 | << " for audio stream " << audio_stream_id_; |
stefan@webrtc.org | 5f28498 | 2012-06-28 07:51:16 +0000 | [diff] [blame] | 172 | |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 173 | // Return values. |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 174 | *total_video_delay_target_ms = new_video_delay_ms; |
turaj@webrtc.org | e46c8d3 | 2013-05-22 20:39:43 +0000 | [diff] [blame] | 175 | *total_audio_delay_target_ms = new_audio_delay_ms; |
stefan@webrtc.org | 7c3523c | 2012-09-11 07:00:42 +0000 | [diff] [blame] | 176 | return true; |
stefan@webrtc.org | 5f28498 | 2012-06-28 07:51:16 +0000 | [diff] [blame] | 177 | } |
mikhal@webrtc.org | ef9f76a | 2013-02-15 23:22:18 +0000 | [diff] [blame] | 178 | |
| 179 | void StreamSynchronization::SetTargetBufferingDelay(int target_delay_ms) { |
mikhal@webrtc.org | 0d8d010 | 2013-02-22 19:30:44 +0000 | [diff] [blame] | 180 | // Initial extra delay for audio (accounting for existing extra delay). |
mflodman | 4cd2790 | 2016-08-05 06:28:45 -0700 | [diff] [blame] | 181 | channel_delay_.extra_audio_delay_ms += |
mikhal@webrtc.org | 0d8d010 | 2013-02-22 19:30:44 +0000 | [diff] [blame] | 182 | target_delay_ms - base_target_delay_ms_; |
Yves Gerey | 665174f | 2018-06-19 15:03:05 +0200 | [diff] [blame] | 183 | channel_delay_.last_audio_delay_ms += target_delay_ms - base_target_delay_ms_; |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 184 | |
mikhal@webrtc.org | 0d8d010 | 2013-02-22 19:30:44 +0000 | [diff] [blame] | 185 | // The video delay is compared to the last value (and how much we can update |
| 186 | // is limited by that as well). |
Yves Gerey | 665174f | 2018-06-19 15:03:05 +0200 | [diff] [blame] | 187 | channel_delay_.last_video_delay_ms += target_delay_ms - base_target_delay_ms_; |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 188 | |
mflodman | 4cd2790 | 2016-08-05 06:28:45 -0700 | [diff] [blame] | 189 | channel_delay_.extra_video_delay_ms += |
pwestin@webrtc.org | d35964a | 2013-04-30 16:06:10 +0000 | [diff] [blame] | 190 | target_delay_ms - base_target_delay_ms_; |
| 191 | |
mikhal@webrtc.org | ef9f76a | 2013-02-15 23:22:18 +0000 | [diff] [blame] | 192 | // Video is already delayed by the desired amount. |
| 193 | base_target_delay_ms_ = target_delay_ms; |
mikhal@webrtc.org | ef9f76a | 2013-02-15 23:22:18 +0000 | [diff] [blame] | 194 | } |
| 195 | |
stefan@webrtc.org | 5f28498 | 2012-06-28 07:51:16 +0000 | [diff] [blame] | 196 | } // namespace webrtc |