blob: d2c1499231bd158ca6cb57e6c39490cdbc4a67d0 [file] [log] [blame]
* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
#include <list>
#include <memory>
#include "webrtc/modules/include/module_common_types.h"
#include "webrtc/modules/video_coding/include/video_coding.h"
#include "webrtc/modules/video_coding/media_opt_util.h"
#include "webrtc/rtc_base/criticalsection.h"
#include "webrtc/system_wrappers/include/clock.h"
namespace webrtc {
// ProtectionBitrateCalculator calculates how much of the allocated network
// capacity that can be used by an encoder and how much that
// is needed for redundant packets such as FEC and NACK. It uses an
// implementation of |VCMProtectionCallback| to set new FEC parameters and get
// the bitrate currently used for FEC and NACK.
// Usage:
// Setup by calling SetProtectionMethod and SetEncodingData.
// For each encoded image, call UpdateWithEncodedData.
// Each time the bandwidth estimate change, call SetTargetRates. SetTargetRates
// will return the bitrate that can be used by an encoder.
// A lock is used to protect internal states, so methods can be called on an
// arbitrary thread.
class ProtectionBitrateCalculator {
ProtectionBitrateCalculator(Clock* clock,
VCMProtectionCallback* protection_callback);
void SetProtectionMethod(bool enable_fec, bool enable_nack);
// Informs media optimization of initial encoding state.
void SetEncodingData(size_t width,
size_t height,
size_t num_temporal_layers,
size_t max_payload_size);
// Returns target rate for the encoder given the channel parameters.
// Inputs: estimated_bitrate_bps - the estimated network bitrate in bits/s.
// actual_framerate - encoder frame rate.
// fraction_lost - packet loss rate in % in the network.
// round_trip_time_ms - round trip time in milliseconds.
uint32_t SetTargetRates(uint32_t estimated_bitrate_bps,
int actual_framerate,
uint8_t fraction_lost,
int64_t round_trip_time_ms);
// Informs of encoded output.
void UpdateWithEncodedData(const EncodedImage& encoded_image);
struct EncodedFrameSample;
enum { kBitrateAverageWinMs = 1000 };
Clock* const clock_;
VCMProtectionCallback* const protection_callback_;
rtc::CriticalSection crit_sect_;
std::unique_ptr<media_optimization::VCMLossProtectionLogic> loss_prot_logic_
size_t max_payload_size_ GUARDED_BY(crit_sect_);
} // namespace webrtc