2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
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.
11 #ifndef WEBRTC_MODULES_VIDEO_CODING_MAIN_SOURCE_MEDIA_OPTIMIZATION_H_
12 #define WEBRTC_MODULES_VIDEO_CODING_MAIN_SOURCE_MEDIA_OPTIMIZATION_H_
16 #include "webrtc/modules/interface/module_common_types.h"
17 #include "webrtc/modules/video_coding/main/interface/video_coding.h"
18 #include "webrtc/modules/video_coding/main/source/media_opt_util.h"
19 #include "webrtc/modules/video_coding/main/source/qm_select.h"
20 #include "webrtc/system_wrappers/interface/scoped_ptr.h"
24 // Forward declarations.
27 class VCMContentMetricsProcessing;
29 namespace media_optimization {
31 // TODO(andresp): Make thread safe.
32 class MediaOptimization {
34 explicit MediaOptimization(Clock* clock);
37 // TODO(andresp): Can Reset and SetEncodingData be done at construction time
41 // Informs media optimization of initial encoding state.
42 void SetEncodingData(VideoCodecType send_codec_type,
48 int num_temporal_layers,
51 // Sets target rates for the encoder given the channel parameters.
52 // Inputs: target bitrate - the encoder target bitrate in bits/s.
53 // fraction_lost - packet loss rate in % in the network.
54 // round_trip_time_ms - round trip time in milliseconds.
55 // min_bit_rate - the bit rate of the end-point with lowest rate.
56 // max_bit_rate - the bit rate of the end-point with highest rate.
57 // TODO(andresp): Find if the callbacks can be triggered only after releasing
58 // an internal critical section.
59 uint32_t SetTargetRates(uint32_t target_bitrate,
60 uint8_t fraction_lost,
61 uint32_t round_trip_time_ms,
62 VCMProtectionCallback* protection_callback,
63 VCMQMSettingsCallback* qmsettings_callback);
65 void EnableProtectionMethod(bool enable, VCMProtectionMethodEnum method);
66 void EnableQM(bool enable);
67 void EnableFrameDropper(bool enable);
69 // Lets the sender suspend video when the rate drops below
70 // |threshold_bps|, and turns back on when the rate goes back up above
71 // |threshold_bps| + |window_bps|.
72 void SuspendBelowMinBitrate(int threshold_bps, int window_bps);
73 bool IsVideoSuspended() const;
77 void UpdateContentData(const VideoContentMetrics* content_metrics);
79 // Informs Media Optimization of encoding output: Length and frame type.
80 int32_t UpdateWithEncodedData(int encoded_length,
82 FrameType encoded_frame_type);
84 uint32_t InputFrameRate();
85 uint32_t SentFrameRate();
86 uint32_t SentBitRate();
87 VCMFrameCount SentFrameCount();
91 kFrameCountHistorySize = 90
94 kFrameHistoryWinMs = 2000
97 kBitrateAverageWinMs = 1000
100 struct EncodedFrameSample;
101 typedef std::list<EncodedFrameSample> FrameSampleList;
103 void UpdateIncomingFrameRate();
104 void PurgeOldFrameSamples(int64_t now_ms);
105 void UpdateSentBitrate(int64_t now_ms);
106 void UpdateSentFramerate();
108 // Computes new Quality Mode.
109 int32_t SelectQuality(VCMQMSettingsCallback* qmsettings_callback);
111 // Verifies if QM settings differ from default, i.e. if an update is required.
112 // Computes actual values, as will be sent to the encoder.
113 bool QMUpdate(VCMResolutionScale* qm,
114 VCMQMSettingsCallback* qmsettings_callback);
116 // Checks if we should make a QM change. Return true if yes, false otherwise.
117 bool CheckStatusForQMchange();
119 void ProcessIncomingFrameRate(int64_t now);
121 // Checks conditions for suspending the video. The method compares
122 // |target_bit_rate_| with the threshold values for suspension, and changes
123 // the state of |video_suspended_| accordingly.
124 void CheckSuspendConditions();
127 int32_t max_bit_rate_;
128 VideoCodecType send_codec_type_;
129 uint16_t codec_width_;
130 uint16_t codec_height_;
131 float user_frame_rate_;
132 scoped_ptr<FrameDropper> frame_dropper_;
133 scoped_ptr<VCMLossProtectionLogic> loss_prot_logic_;
134 uint8_t fraction_lost_;
135 uint32_t send_statistics_[4];
136 uint32_t send_statistics_zero_encode_;
137 int32_t max_payload_size_;
138 int target_bit_rate_;
139 float incoming_frame_rate_;
140 int64_t incoming_frame_times_[kFrameCountHistorySize];
142 std::list<EncodedFrameSample> encoded_frame_samples_;
143 uint32_t avg_sent_bit_rate_bps_;
144 uint32_t avg_sent_framerate_;
145 uint32_t key_frame_cnt_;
146 uint32_t delta_frame_cnt_;
147 scoped_ptr<VCMContentMetricsProcessing> content_;
148 scoped_ptr<VCMQmResolution> qm_resolution_;
149 int64_t last_qm_update_time_;
150 int64_t last_change_time_; // Content/user triggered.
152 bool suspension_enabled_;
153 bool video_suspended_;
154 int suspension_threshold_bps_;
155 int suspension_window_bps_;
157 } // namespace media_optimization
158 } // namespace webrtc
160 #endif // WEBRTC_MODULES_VIDEO_CODING_MAIN_SOURCE_MEDIA_OPTIMIZATION_H_