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| 1 /* |
| 2 * Copyright 2017 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 WEBRTC_BASE_BITRATEALLOCATIONSTRATEGY_H_ |
| 12 #define WEBRTC_BASE_BITRATEALLOCATIONSTRATEGY_H_ |
| 13 |
| 14 #include <map> |
| 15 #include <string> |
| 16 #include <vector> |
| 17 #include "webrtc/base/checks.h" |
| 18 #include "webrtc/base/refcountedobject.h" |
| 19 |
| 20 namespace rtc { |
| 21 |
| 22 // Plugable strategy allows configuration of bitrate allocation per media track |
| 23 class BitrateAllocationStrategyConfig { |
| 24 public: |
| 25 struct TrackConfig { |
| 26 TrackConfig(uint32_t min_bitrate_bps, |
| 27 uint32_t max_bitrate_bps, |
| 28 bool enforce_min_bitrate, |
| 29 std::string track_id) |
| 30 : min_bitrate_bps(min_bitrate_bps), |
| 31 max_bitrate_bps(max_bitrate_bps), |
| 32 enforce_min_bitrate(enforce_min_bitrate), |
| 33 track_id(track_id) {} |
| 34 TrackConfig(const TrackConfig& track_config) |
| 35 : min_bitrate_bps(track_config.min_bitrate_bps), |
| 36 max_bitrate_bps(track_config.max_bitrate_bps), |
| 37 enforce_min_bitrate(track_config.enforce_min_bitrate), |
| 38 track_id(track_config.track_id) {} |
| 39 TrackConfig() {} |
| 40 |
| 41 uint32_t min_bitrate_bps; |
| 42 uint32_t max_bitrate_bps; |
| 43 bool enforce_min_bitrate; |
| 44 std::string track_id; |
| 45 }; |
| 46 // Track ID to track bitrate allocation |
| 47 typedef std::map<std::string, uint32_t> TrackAllocations; |
| 48 // Track ID to track config |
| 49 typedef std::map<std::string, TrackConfig> TrackConfigs; |
| 50 |
| 51 virtual ~BitrateAllocationStrategyConfig() = default; |
| 52 }; |
| 53 |
| 54 // The base class future allocation strategies will inherit |
| 55 class BitrateAllocationStrategy |
| 56 : public RefCountedObject<BitrateAllocationStrategyConfig> { |
| 57 public: |
| 58 // Will be called by bitrate allocator, should return allocated bitrate |
| 59 // for every track. |
| 60 virtual TrackAllocations AllocateBitrates( |
| 61 uint32_t available_bitrate, |
| 62 const TrackConfigs& track_configs) = 0; |
| 63 |
| 64 TrackAllocations SetAllBitratesToMinimum(const TrackConfigs& track_configs); |
| 65 TrackAllocations DistributeBitratesEvenly(const TrackConfigs& track_configs, |
| 66 uint32_t available_bitrate); |
| 67 }; |
| 68 |
| 69 // Simple allocation strategy giving priority to audio at low bitrates |
| 70 class AudioPriorityBitrateAllocationStrategy |
| 71 : public BitrateAllocationStrategy { |
| 72 public: |
| 73 AudioPriorityBitrateAllocationStrategy(std::string audio_track_id, |
| 74 uint32_t sufficient_audio_bitrate); |
| 75 TrackAllocations AllocateBitrates(uint32_t available_bitrate, |
| 76 const TrackConfigs& track_configs) override; |
| 77 |
| 78 private: |
| 79 std::string audio_track_id_; |
| 80 uint32_t sufficient_audio_bitrate_; |
| 81 }; |
| 82 } // namespace rtc |
| 83 |
| 84 #endif // WEBRTC_BASE_BITRATEALLOCATIONSTRATEGY_H_ |
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