9f79fe684a
R=stefan@webrtc.org BUG= Review URL: https://webrtc-codereview.appspot.com/33489004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@7811 4adac7df-926f-26a2-2b94-8c16560cd09d
86 lines
3.0 KiB
C++
86 lines
3.0 KiB
C++
/*
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* Copyright (c) 2013 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_REMOTE_BITRATE_ESTIMATOR_INTER_ARRIVAL_H_
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#define WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_INTER_ARRIVAL_H_
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#include <cstddef>
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#include "webrtc/base/constructormagic.h"
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#include "webrtc/typedefs.h"
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namespace webrtc {
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// Helper class to compute the inter-arrival time delta and the size delta
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// between two timestamp groups. A timestamp is a 32 bit unsigned number with
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// a client defined rate.
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class InterArrival {
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public:
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// A timestamp group is defined as all packets with a timestamp which are at
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// most timestamp_group_length_ticks older than the first timestamp in that
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// group.
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InterArrival(uint32_t timestamp_group_length_ticks,
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double timestamp_to_ms_coeff,
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bool enable_burst_grouping);
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// This function returns true if a delta was computed, or false if the current
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// group is still incomplete or if only one group has been completed.
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// |timestamp| is the timestamp.
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// |arrival_time_ms| is the local time at which the packet arrived.
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// |packet_size| is the size of the packet.
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// |timestamp_delta| (output) is the computed timestamp delta.
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// |arrival_time_delta_ms| (output) is the computed arrival-time delta.
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// |packet_size_delta| (output) is the computed size delta.
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bool ComputeDeltas(uint32_t timestamp,
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int64_t arrival_time_ms,
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size_t packet_size,
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uint32_t* timestamp_delta,
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int64_t* arrival_time_delta_ms,
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int* packet_size_delta);
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private:
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struct TimestampGroup {
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TimestampGroup()
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: size(0),
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first_timestamp(0),
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timestamp(0),
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complete_time_ms(-1) {}
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bool IsFirstPacket() const {
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return complete_time_ms == -1;
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}
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size_t size;
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uint32_t first_timestamp;
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uint32_t timestamp;
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int64_t complete_time_ms;
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};
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// Returns true if the packet with timestamp |timestamp| arrived in order.
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bool PacketInOrder(uint32_t timestamp);
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// Returns true if the last packet was the end of the current batch and the
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// packet with |timestamp| is the first of a new batch.
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bool NewTimestampGroup(int64_t arrival_time_ms, uint32_t timestamp) const;
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bool BelongsToBurst(int64_t arrival_time_ms, uint32_t timestamp) const;
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const uint32_t kTimestampGroupLengthTicks;
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TimestampGroup current_timestamp_group_;
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TimestampGroup prev_timestamp_group_;
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double timestamp_to_ms_coeff_;
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bool burst_grouping_;
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DISALLOW_IMPLICIT_CONSTRUCTORS(InterArrival);
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_INTER_ARRIVAL_H_
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