c2c24f795e
These arguments are not really known when calling SetEncodingData. They are still provided as argument to ProtectionBitrateCalculator::SetTargetRates though. This cl is broken out from https://codereview.webrtc.org/2060403002/ BUG=webrtc:5687 Review-Url: https://codereview.webrtc.org/2121983002 Cr-Commit-Position: refs/heads/master@{#13429}
80 lines
3.2 KiB
C++
80 lines
3.2 KiB
C++
/*
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* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_MODULES_VIDEO_CODING_PROTECTION_BITRATE_CALCULATOR_H_
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#define WEBRTC_MODULES_VIDEO_CODING_PROTECTION_BITRATE_CALCULATOR_H_
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#include <list>
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#include <memory>
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#include "webrtc/base/criticalsection.h"
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#include "webrtc/modules/include/module_common_types.h"
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#include "webrtc/modules/video_coding/include/video_coding.h"
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#include "webrtc/modules/video_coding/media_opt_util.h"
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#include "webrtc/system_wrappers/include/clock.h"
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namespace webrtc {
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// ProtectionBitrateCalculator calculates how much of the allocated network
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// capacity that can be used by an encoder and how much that
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// is needed for redundant packets such as FEC and NACK. It uses an
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// implementation of |VCMProtectionCallback| to set new FEC parameters and get
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// the bitrate currently used for FEC and NACK.
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// Usage:
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// Setup by calling SetProtectionMethod and SetEncodingData.
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// For each encoded image, call UpdateWithEncodedData.
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// Each time the bandwidth estimate change, call SetTargetRates. SetTargetRates
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// will return the bitrate that can be used by an encoder.
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// A lock is used to protect internal states, so methods can be called on an
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// arbitrary thread.
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class ProtectionBitrateCalculator {
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public:
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ProtectionBitrateCalculator(Clock* clock,
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VCMProtectionCallback* protection_callback);
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~ProtectionBitrateCalculator();
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void SetProtectionMethod(bool enable_fec, bool enable_nack);
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// Informs media optimization of initial encoding state.
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void SetEncodingData(size_t width,
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size_t height,
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size_t num_temporal_layers,
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size_t max_payload_size);
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// Returns target rate for the encoder given the channel parameters.
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// Inputs: estimated_bitrate_bps - the estimated network bitrate in bits/s.
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// actual_framerate - encoder frame rate.
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// fraction_lost - packet loss rate in % in the network.
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// round_trip_time_ms - round trip time in milliseconds.
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uint32_t SetTargetRates(uint32_t estimated_bitrate_bps,
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int actual_framerate,
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uint8_t fraction_lost,
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int64_t round_trip_time_ms);
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// Informs of encoded output.
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void UpdateWithEncodedData(const EncodedImage& encoded_image);
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private:
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struct EncodedFrameSample;
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enum { kBitrateAverageWinMs = 1000 };
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Clock* const clock_;
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VCMProtectionCallback* const protection_callback_;
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rtc::CriticalSection crit_sect_;
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std::unique_ptr<media_optimization::VCMLossProtectionLogic> loss_prot_logic_
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GUARDED_BY(crit_sect_);
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size_t max_payload_size_ GUARDED_BY(crit_sect_);
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RTC_DISALLOW_COPY_AND_ASSIGN(ProtectionBitrateCalculator);
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_VIDEO_CODING_PROTECTION_BITRATE_CALCULATOR_H_
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