1 /*
2 * Copyright (c) 2016 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 #include "modules/audio_coding/audio_network_adaptor/channel_controller.h"
12
13 #include <algorithm>
14
15 #include "rtc_base/checks.h"
16
17 namespace webrtc {
18
Config(size_t num_encoder_channels,size_t intial_channels_to_encode,int channel_1_to_2_bandwidth_bps,int channel_2_to_1_bandwidth_bps)19 ChannelController::Config::Config(size_t num_encoder_channels,
20 size_t intial_channels_to_encode,
21 int channel_1_to_2_bandwidth_bps,
22 int channel_2_to_1_bandwidth_bps)
23 : num_encoder_channels(num_encoder_channels),
24 intial_channels_to_encode(intial_channels_to_encode),
25 channel_1_to_2_bandwidth_bps(channel_1_to_2_bandwidth_bps),
26 channel_2_to_1_bandwidth_bps(channel_2_to_1_bandwidth_bps) {}
27
ChannelController(const Config & config)28 ChannelController::ChannelController(const Config& config)
29 : config_(config), channels_to_encode_(config_.intial_channels_to_encode) {
30 RTC_DCHECK_GT(config_.intial_channels_to_encode, 0lu);
31 // Currently, we require `intial_channels_to_encode` to be <= 2.
32 RTC_DCHECK_LE(config_.intial_channels_to_encode, 2lu);
33 RTC_DCHECK_GE(config_.num_encoder_channels,
34 config_.intial_channels_to_encode);
35 }
36
37 ChannelController::~ChannelController() = default;
38
UpdateNetworkMetrics(const NetworkMetrics & network_metrics)39 void ChannelController::UpdateNetworkMetrics(
40 const NetworkMetrics& network_metrics) {
41 if (network_metrics.uplink_bandwidth_bps)
42 uplink_bandwidth_bps_ = network_metrics.uplink_bandwidth_bps;
43 }
44
MakeDecision(AudioEncoderRuntimeConfig * config)45 void ChannelController::MakeDecision(AudioEncoderRuntimeConfig* config) {
46 // Decision on `num_channels` should not have been made.
47 RTC_DCHECK(!config->num_channels);
48
49 if (uplink_bandwidth_bps_) {
50 if (channels_to_encode_ == 2 &&
51 *uplink_bandwidth_bps_ <= config_.channel_2_to_1_bandwidth_bps) {
52 channels_to_encode_ = 1;
53 } else if (channels_to_encode_ == 1 &&
54 *uplink_bandwidth_bps_ >= config_.channel_1_to_2_bandwidth_bps) {
55 channels_to_encode_ =
56 std::min(static_cast<size_t>(2), config_.num_encoder_channels);
57 }
58 }
59 config->num_channels = channels_to_encode_;
60 }
61
62 } // namespace webrtc
63