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/*
* Copyright (c) 2012 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.
*/
// This class estimates the incoming available bandwidth.
#ifndef WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_INCLUDE_REMOTE_BITRATE_ESTIMATOR_H_
#define WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_INCLUDE_REMOTE_BITRATE_ESTIMATOR_H_
#include <map>
#include <vector>
#include "webrtc/common_types.h"
#include "webrtc/modules/include/module.h"
#include "webrtc/modules/include/module_common_types.h"
#include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"
#include "webrtc/typedefs.h"
namespace webrtc {
class Clock;
// RemoteBitrateObserver is used to signal changes in bitrate estimates for
// the incoming streams.
class RemoteBitrateObserver {
public:
// Called when a receive channel group has a new bitrate estimate for the
// incoming streams.
virtual void OnReceiveBitrateChanged(const std::vector<unsigned int>& ssrcs,
unsigned int bitrate) = 0;
virtual ~RemoteBitrateObserver() {}
};
struct ReceiveBandwidthEstimatorStats {
ReceiveBandwidthEstimatorStats() : total_propagation_time_delta_ms(0) {}
// The "propagation_time_delta" of a frame is defined as (d_arrival - d_sent),
// where d_arrival is the delta of the arrival times of the frame and the
// previous frame, d_sent is the delta of the sent times of the frame and
// the previous frame. The sent time is calculated from the RTP timestamp.
// |total_propagation_time_delta_ms| is the sum of the propagation_time_deltas
// of all received frames, except that it's is adjusted to 0 when it becomes
// negative.
int total_propagation_time_delta_ms;
// The propagation_time_deltas for the frames arrived in the last
// kProcessIntervalMs using the clock passed to
// RemoteBitrateEstimatorFactory::Create.
std::vector<int> recent_propagation_time_delta_ms;
// The arrival times for the frames arrived in the last kProcessIntervalMs
// using the clock passed to RemoteBitrateEstimatorFactory::Create.
std::vector<int64_t> recent_arrival_time_ms;
};
class RemoteBitrateEstimator : public CallStatsObserver, public Module {
public:
static const int kDefaultMinBitrateBps = 30000;
virtual ~RemoteBitrateEstimator() {}
virtual void IncomingPacketFeedbackVector(
const std::vector<PacketInfo>& packet_feedback_vector) {
assert(false);
}
// Called for each incoming packet. Updates the incoming payload bitrate
// estimate and the over-use detector. If an over-use is detected the
// remote bitrate estimate will be updated. Note that |payload_size| is the
// packet size excluding headers.
// Note that |arrival_time_ms| can be of an arbitrary time base.
virtual void IncomingPacket(int64_t arrival_time_ms,
size_t payload_size,
const RTPHeader& header,
bool was_paced) = 0;
// Removes all data for |ssrc|.
virtual void RemoveStream(unsigned int ssrc) = 0;
// Returns true if a valid estimate exists and sets |bitrate_bps| to the
// estimated payload bitrate in bits per second. |ssrcs| is the list of ssrcs
// currently being received and of which the bitrate estimate is based upon.
virtual bool LatestEstimate(std::vector<unsigned int>* ssrcs,
unsigned int* bitrate_bps) const = 0;
// Returns true if the statistics are available.
virtual bool GetStats(ReceiveBandwidthEstimatorStats* output) const = 0;
virtual void SetMinBitrate(int min_bitrate_bps) = 0;
protected:
static const int64_t kProcessIntervalMs = 500;
static const int64_t kStreamTimeOutMs = 2000;
};
} // namespace webrtc
#endif // WEBRTC_MODULES_REMOTE_BITRATE_ESTIMATOR_INCLUDE_REMOTE_BITRATE_ESTIMATOR_H_
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