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1 /* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. | 1 /* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. |
2 * | 2 * |
3 * Use of this source code is governed by a BSD-style license | 3 * Use of this source code is governed by a BSD-style license |
4 * that can be found in the LICENSE file in the root of the source | 4 * that can be found in the LICENSE file in the root of the source |
5 * tree. An additional intellectual property rights grant can be found | 5 * tree. An additional intellectual property rights grant can be found |
6 * in the file PATENTS. All contributing project authors may | 6 * in the file PATENTS. All contributing project authors may |
7 * be found in the AUTHORS file in the root of the source tree. | 7 * be found in the AUTHORS file in the root of the source tree. |
8 */ | 8 */ |
9 | 9 |
10 #include "webrtc/modules/video_coding/codecs/vp8/screenshare_layers.h" | 10 #include "webrtc/modules/video_coding/codecs/vp8/screenshare_layers.h" |
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23 namespace webrtc { | 23 namespace webrtc { |
24 | 24 |
25 static const int kOneSecond90Khz = 90000; | 25 static const int kOneSecond90Khz = 90000; |
26 static const int kMinTimeBetweenSyncs = kOneSecond90Khz * 5; | 26 static const int kMinTimeBetweenSyncs = kOneSecond90Khz * 5; |
27 static const int kMaxTimeBetweenSyncs = kOneSecond90Khz * 10; | 27 static const int kMaxTimeBetweenSyncs = kOneSecond90Khz * 10; |
28 static const int kQpDeltaThresholdForSync = 8; | 28 static const int kQpDeltaThresholdForSync = 8; |
29 | 29 |
30 const double ScreenshareLayers::kMaxTL0FpsReduction = 2.5; | 30 const double ScreenshareLayers::kMaxTL0FpsReduction = 2.5; |
31 const double ScreenshareLayers::kAcceptableTargetOvershoot = 2.0; | 31 const double ScreenshareLayers::kAcceptableTargetOvershoot = 2.0; |
32 | 32 |
| 33 constexpr int ScreenshareLayers::kMaxNumTemporalLayers; |
| 34 |
33 // Since this is TL0 we only allow updating and predicting from the LAST | 35 // Since this is TL0 we only allow updating and predicting from the LAST |
34 // reference frame. | 36 // reference frame. |
35 const int ScreenshareLayers::kTl0Flags = | 37 const int ScreenshareLayers::kTl0Flags = |
36 VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_REF_GF | | 38 VP8_EFLAG_NO_UPD_GF | VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_REF_GF | |
37 VP8_EFLAG_NO_REF_ARF; | 39 VP8_EFLAG_NO_REF_ARF; |
38 | 40 |
39 // Allow predicting from both TL0 and TL1. | 41 // Allow predicting from both TL0 and TL1. |
40 const int ScreenshareLayers::kTl1Flags = | 42 const int ScreenshareLayers::kTl1Flags = |
41 VP8_EFLAG_NO_REF_ARF | VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_UPD_LAST; | 43 VP8_EFLAG_NO_REF_ARF | VP8_EFLAG_NO_UPD_ARF | VP8_EFLAG_NO_UPD_LAST; |
42 | 44 |
43 // Allow predicting from only TL0 to allow participants to switch to the high | 45 // Allow predicting from only TL0 to allow participants to switch to the high |
44 // bitrate stream. This means predicting only from the LAST reference frame, but | 46 // bitrate stream. This means predicting only from the LAST reference frame, but |
45 // only updating GF to not corrupt TL0. | 47 // only updating GF to not corrupt TL0. |
46 const int ScreenshareLayers::kTl1SyncFlags = | 48 const int ScreenshareLayers::kTl1SyncFlags = |
47 VP8_EFLAG_NO_REF_ARF | VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_UPD_ARF | | 49 VP8_EFLAG_NO_REF_ARF | VP8_EFLAG_NO_REF_GF | VP8_EFLAG_NO_UPD_ARF | |
48 VP8_EFLAG_NO_UPD_LAST; | 50 VP8_EFLAG_NO_UPD_LAST; |
49 | 51 |
50 // Always emit a frame with certain interval, even if bitrate targets have | 52 // Always emit a frame with certain interval, even if bitrate targets have |
51 // been exceeded. | 53 // been exceeded. |
52 const int ScreenshareLayers::kMaxFrameIntervalMs = 2000; | 54 const int ScreenshareLayers::kMaxFrameIntervalMs = 2000; |
53 | 55 |
54 webrtc::TemporalLayers* ScreenshareTemporalLayersFactory::Create( | 56 webrtc::TemporalLayers* ScreenshareTemporalLayersFactory::Create( |
55 int simulcast_id, | 57 int simulcast_id, |
56 int num_temporal_layers, | 58 int num_temporal_layers, |
57 uint8_t initial_tl0_pic_idx) const { | 59 uint8_t initial_tl0_pic_idx) const { |
58 webrtc::TemporalLayers* tl = new webrtc::ScreenshareLayers( | 60 webrtc::TemporalLayers* tl; |
59 num_temporal_layers, rand(), webrtc::Clock::GetRealTimeClock()); | 61 if (simulcast_id == 0) { |
| 62 tl = new webrtc::ScreenshareLayers(num_temporal_layers, rand(), |
| 63 webrtc::Clock::GetRealTimeClock()); |
| 64 } else { |
| 65 RealTimeTemporalLayersFactory rt_tl_factory; |
| 66 tl = rt_tl_factory.Create(simulcast_id, num_temporal_layers, rand()); |
| 67 } |
60 if (listener_) | 68 if (listener_) |
61 listener_->OnTemporalLayersCreated(simulcast_id, tl); | 69 listener_->OnTemporalLayersCreated(simulcast_id, tl); |
62 return tl; | 70 return tl; |
63 } | 71 } |
64 | 72 |
65 ScreenshareLayers::ScreenshareLayers(int num_temporal_layers, | 73 ScreenshareLayers::ScreenshareLayers(int num_temporal_layers, |
66 uint8_t initial_tl0_pic_idx, | 74 uint8_t initial_tl0_pic_idx, |
67 Clock* clock) | 75 Clock* clock) |
68 : clock_(clock), | 76 : clock_(clock), |
69 number_of_temporal_layers_(num_temporal_layers), | 77 number_of_temporal_layers_( |
| 78 std::min(kMaxNumTemporalLayers, num_temporal_layers)), |
70 last_base_layer_sync_(false), | 79 last_base_layer_sync_(false), |
71 tl0_pic_idx_(initial_tl0_pic_idx), | 80 tl0_pic_idx_(initial_tl0_pic_idx), |
72 active_layer_(-1), | 81 active_layer_(-1), |
73 last_timestamp_(-1), | 82 last_timestamp_(-1), |
74 last_sync_timestamp_(-1), | 83 last_sync_timestamp_(-1), |
75 last_emitted_tl0_timestamp_(-1), | 84 last_emitted_tl0_timestamp_(-1), |
76 min_qp_(-1), | 85 min_qp_(-1), |
77 max_qp_(-1), | 86 max_qp_(-1), |
78 max_debt_bytes_(0), | 87 max_debt_bytes_(0), |
79 encode_framerate_(1000.0f, 1000.0f), // 1 second window, second scale. | 88 encode_framerate_(1000.0f, 1000.0f), // 1 second window, second scale. |
80 bitrate_updated_(false) { | 89 bitrate_updated_(false) { |
81 RTC_CHECK_GT(num_temporal_layers, 0); | 90 RTC_CHECK_GT(number_of_temporal_layers_, 0); |
82 RTC_CHECK_LE(num_temporal_layers, 2); | 91 RTC_CHECK_LE(number_of_temporal_layers_, kMaxNumTemporalLayers); |
83 } | 92 } |
84 | 93 |
85 ScreenshareLayers::~ScreenshareLayers() { | 94 ScreenshareLayers::~ScreenshareLayers() { |
86 UpdateHistograms(); | 95 UpdateHistograms(); |
87 } | 96 } |
88 | 97 |
89 int ScreenshareLayers::CurrentLayerId() const { | 98 int ScreenshareLayers::CurrentLayerId() const { |
90 // Codec does not use temporal layers for screenshare. | 99 // Codec does not use temporal layers for screenshare. |
91 return 0; | 100 return 0; |
92 } | 101 } |
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407 RTC_HISTOGRAM_COUNTS_10000("WebRTC.Video.Screenshare.Layer1.Qp", | 416 RTC_HISTOGRAM_COUNTS_10000("WebRTC.Video.Screenshare.Layer1.Qp", |
408 stats_.tl1_qp_sum_ / stats_.num_tl1_frames_); | 417 stats_.tl1_qp_sum_ / stats_.num_tl1_frames_); |
409 RTC_HISTOGRAM_COUNTS_10000( | 418 RTC_HISTOGRAM_COUNTS_10000( |
410 "WebRTC.Video.Screenshare.Layer1.TargetBitrate", | 419 "WebRTC.Video.Screenshare.Layer1.TargetBitrate", |
411 stats_.tl1_target_bitrate_sum_ / stats_.num_tl1_frames_); | 420 stats_.tl1_target_bitrate_sum_ / stats_.num_tl1_frames_); |
412 } | 421 } |
413 } | 422 } |
414 } | 423 } |
415 | 424 |
416 } // namespace webrtc | 425 } // namespace webrtc |
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