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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_CAST_CONGESTION_CONTROL_CONGESTION_CONTROL_H_
#define MEDIA_CAST_CONGESTION_CONTROL_CONGESTION_CONTROL_H_
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/time/tick_clock.h"
#include "base/time/time.h"
namespace media {
namespace cast {
class CongestionControl {
public:
virtual ~CongestionControl();
// Called with latest measured rtt value.
virtual void UpdateRtt(base::TimeDelta rtt) = 0;
// Called with an updated target playout delay value.
virtual void UpdateTargetPlayoutDelay(base::TimeDelta delay) = 0;
// Called when an encoded frame is enqueued for transport.
virtual void SendFrameToTransport(uint32 frame_id,
size_t frame_size_in_bits,
base::TimeTicks when) = 0;
// Called when we receive an ACK for a frame.
virtual void AckFrame(uint32 frame_id, base::TimeTicks when) = 0;
// Returns the bitrate we should use for the next frame. |soft_max_bitrate|
// is a soft upper-bound applied to the computed target bitrate before the
// hard upper- and lower-bounds are applied.
virtual int GetBitrate(base::TimeTicks playout_time,
base::TimeDelta playout_delay,
int soft_max_bitrate) = 0;
};
CongestionControl* NewAdaptiveCongestionControl(
base::TickClock* clock,
int max_bitrate_configured,
int min_bitrate_configured,
double max_frame_rate);
CongestionControl* NewFixedCongestionControl(int bitrate);
} // namespace cast
} // namespace media
#endif // MEDIA_CAST_CONGESTION_CONTROL_CONGESTION_CONTROL_H_
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