1 /*
2  *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #ifndef MEDIA_BASE_DELAYABLE_H_
12 #define MEDIA_BASE_DELAYABLE_H_
13 
14 #include <stdint.h>
15 
16 #include "absl/types/optional.h"
17 
18 namespace cricket {
19 
20 // Delayable is used by user code through ApplyConstraints algorithm. Its
21 // methods must take precendence over similar functional in |syncable.h|.
22 class Delayable {
23  public:
~Delayable()24   virtual ~Delayable() {}
25   // Set base minimum delay of the receive stream with specified ssrc.
26   // Base minimum delay sets lower bound on minimum delay value which
27   // determines minimum delay until audio playout.
28   // Returns false if there is no stream with given ssrc.
29   virtual bool SetBaseMinimumPlayoutDelayMs(uint32_t ssrc, int delay_ms) = 0;
30 
31   // Returns current value of base minimum delay in milliseconds.
32   virtual absl::optional<int> GetBaseMinimumPlayoutDelayMs(
33       uint32_t ssrc) const = 0;
34 };
35 
36 }  // namespace cricket
37 
38 #endif  // MEDIA_BASE_DELAYABLE_H_
39