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/*
* Copyright (c) 2016 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 "modules/audio_coding/audio_network_adaptor/channel_controller.h"
#include <algorithm>
#include "rtc_base/checks.h"
namespace webrtc {
ChannelController::Config::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)
: num_encoder_channels(num_encoder_channels),
intial_channels_to_encode(intial_channels_to_encode),
channel_1_to_2_bandwidth_bps(channel_1_to_2_bandwidth_bps),
channel_2_to_1_bandwidth_bps(channel_2_to_1_bandwidth_bps) {}
ChannelController::ChannelController(const Config& config)
: config_(config), channels_to_encode_(config_.intial_channels_to_encode) {
RTC_DCHECK_GT(config_.intial_channels_to_encode, 0lu);
// Currently, we require `intial_channels_to_encode` to be <= 2.
RTC_DCHECK_LE(config_.intial_channels_to_encode, 2lu);
RTC_DCHECK_GE(config_.num_encoder_channels,
config_.intial_channels_to_encode);
}
ChannelController::~ChannelController() = default;
void ChannelController::UpdateNetworkMetrics(
const NetworkMetrics& network_metrics) {
if (network_metrics.uplink_bandwidth_bps)
uplink_bandwidth_bps_ = network_metrics.uplink_bandwidth_bps;
}
void ChannelController::MakeDecision(AudioEncoderRuntimeConfig* config) {
// Decision on `num_channels` should not have been made.
RTC_DCHECK(!config->num_channels);
if (uplink_bandwidth_bps_) {
if (channels_to_encode_ == 2 &&
*uplink_bandwidth_bps_ <= config_.channel_2_to_1_bandwidth_bps) {
channels_to_encode_ = 1;
} else if (channels_to_encode_ == 1 &&
*uplink_bandwidth_bps_ >= config_.channel_1_to_2_bandwidth_bps) {
channels_to_encode_ =
std::min(static_cast<size_t>(2), config_.num_encoder_channels);
}
}
config->num_channels = channels_to_encode_;
}
} // namespace webrtc
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