fe0c90501b
These small packets are common for H.264 where the first packet of an IDR contains the parameter sets. BUG=4806 Review URL: https://codereview.webrtc.org/1221943002 Cr-Commit-Position: refs/heads/master@{#9639}
64 lines
2.0 KiB
C++
64 lines
2.0 KiB
C++
/*
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* Copyright (c) 2014 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_PACING_BITRATE_PROBER_H_
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#define WEBRTC_MODULES_PACING_BITRATE_PROBER_H_
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#include <cstddef>
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#include <list>
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#include "webrtc/typedefs.h"
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namespace webrtc {
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// Note that this class isn't thread-safe by itself and therefore relies
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// on being protected by the caller.
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class BitrateProber {
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public:
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static const size_t kMinProbePacketSize;
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BitrateProber();
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void SetEnabled(bool enable);
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// Returns true if the prober is in a probing session, i.e., it currently
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// wants packets to be sent out according to the time returned by
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// TimeUntilNextProbe().
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bool IsProbing() const;
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// Initializes a new probing session if the prober is allowed to probe.
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void MaybeInitializeProbe(int bitrate_bps);
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// Returns the number of milliseconds until the next packet should be sent to
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// get accurate probing.
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int TimeUntilNextProbe(int64_t now_ms);
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// Returns the number of bytes that the prober recommends for the next probe
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// packet.
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size_t RecommendedPacketSize() const;
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// Called to report to the prober that a packet has been sent, which helps the
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// prober know when to move to the next packet in a probe.
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void PacketSent(int64_t now_ms, size_t packet_size);
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private:
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enum ProbingState { kDisabled, kAllowedToProbe, kProbing, kWait };
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ProbingState probing_state_;
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// Probe bitrate per packet. These are used to compute the delta relative to
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// the previous probe packet based on the size and time when that packet was
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// sent.
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std::list<int> probe_bitrates_;
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size_t packet_size_last_send_;
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int64_t time_last_send_ms_;
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_PACING_BITRATE_PROBER_H_
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