Index: webrtc/rtc_base/bitrateallocationstrategy.cc |
diff --git a/webrtc/rtc_base/bitrateallocationstrategy.cc b/webrtc/rtc_base/bitrateallocationstrategy.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..ac15a2fb5ec9e4c98b515c11cbbdf27b1fa9c3e5 |
--- /dev/null |
+++ b/webrtc/rtc_base/bitrateallocationstrategy.cc |
@@ -0,0 +1,112 @@ |
+/* |
+ * Copyright 2017 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. |
+ */ |
+ |
+#include "webrtc/rtc_base/bitrateallocationstrategy.h" |
+#include <algorithm> |
+#include <utility> |
+ |
+namespace rtc { |
+ |
+BitrateAllocationStrategy::TrackAllocations |
+BitrateAllocationStrategy::SetAllBitratesToMinimum( |
+ const TrackConfigs& track_configs) { |
+ TrackAllocations track_allocations; |
+ for (const auto& track_config : track_configs) { |
+ track_allocations[track_config.second.track_id] = |
+ track_config.second.min_bitrate_bps; |
+ } |
+ return track_allocations; |
+} |
+ |
+BitrateAllocationStrategy::TrackAllocations |
+BitrateAllocationStrategy::DistributeBitratesEvenly( |
+ const TrackConfigs& track_configs, |
+ uint32_t available_bitrate) { |
+ TrackAllocations track_allocations = SetAllBitratesToMinimum(track_configs); |
+ uint32_t sum_min_bitrates = 0; |
+ uint32_t sum_max_bitrates = 0; |
+ for (const auto& track_config : track_configs) { |
+ sum_min_bitrates += track_config.second.min_bitrate_bps; |
+ sum_max_bitrates += track_config.second.max_bitrate_bps; |
+ } |
+ if (sum_min_bitrates >= available_bitrate) { |
+ return track_allocations; |
+ } else if (available_bitrate >= sum_max_bitrates) { |
+ for (const auto& track_config : track_configs) { |
+ track_allocations[track_config.second.track_id] = |
+ track_config.second.max_bitrate_bps; |
+ } |
+ return track_allocations; |
+ } else { |
+ std::multimap<uint32_t, TrackConfig> max_bitrate_sorted_configs; |
+ for (const auto& track_config : track_configs) { |
+ max_bitrate_sorted_configs.insert(std::pair<uint32_t, const TrackConfig&>( |
+ track_config.second.max_bitrate_bps, track_config.second)); |
+ } |
+ uint32_t total_available_increase = (available_bitrate - sum_min_bitrates); |
+ int processed_configs = 0; |
+ for (const auto& track_config_pair : max_bitrate_sorted_configs) { |
+ TrackConfig track_config = track_config_pair.second; |
+ uint32_t available_increase = |
+ total_available_increase / |
+ (static_cast<uint32_t>(track_configs.size() - processed_configs)); |
+ uint32_t consumed_increase = |
+ std::min(track_config.max_bitrate_bps, available_increase); |
+ track_allocations[track_config.track_id] += consumed_increase; |
+ total_available_increase -= consumed_increase; |
+ ++processed_configs; |
+ } |
+ return track_allocations; |
+ } |
+} |
+ |
+AudioPriorityBitrateAllocationStrategy::AudioPriorityBitrateAllocationStrategy( |
+ std::string audio_track_id, |
+ uint32_t sufficient_audio_bitrate) |
+ : audio_track_id_(audio_track_id), |
+ sufficient_audio_bitrate_(sufficient_audio_bitrate) {} |
+ |
+BitrateAllocationStrategy::TrackAllocations |
+AudioPriorityBitrateAllocationStrategy::AllocateBitrates( |
+ uint32_t available_bitrate, |
+ const TrackConfigs& track_configs) { |
+ auto audio_track_config_pair = track_configs.find(audio_track_id_); |
+ const TrackConfig& audio_track_config = audio_track_config_pair->second; |
+ if (audio_track_config_pair == track_configs.end()) { |
+ return DistributeBitratesEvenly(track_configs, available_bitrate); |
+ } else { |
+ RTC_DCHECK(sufficient_audio_bitrate_ >= audio_track_config.min_bitrate_bps); |
+ uint32_t sum_min_bitrates = 0; |
+ for (const auto& track_config : track_configs) { |
+ sum_min_bitrates += track_config.second.min_bitrate_bps; |
+ } |
+ if (available_bitrate <= sum_min_bitrates) { |
+ return SetAllBitratesToMinimum(track_configs); |
+ } else { |
+ if (available_bitrate <= sum_min_bitrates + sufficient_audio_bitrate_ - |
+ audio_track_config.min_bitrate_bps) { |
+ TrackAllocations track_allocations = |
+ SetAllBitratesToMinimum(track_configs); |
+ track_allocations[audio_track_id_] += |
+ available_bitrate - sum_min_bitrates; |
+ return track_allocations; |
+ } else { |
+ TrackConfig sufficient_audio_config(audio_track_config); |
+ sufficient_audio_config.min_bitrate_bps = sufficient_audio_bitrate_; |
+ TrackConfigs sufficient_track_configs(track_configs); |
+ sufficient_track_configs[audio_track_id_] = sufficient_audio_config; |
+ return DistributeBitratesEvenly(sufficient_track_configs, |
+ available_bitrate); |
+ } |
+ } |
+ } |
+} |
+ |
+} // namespace rtc |