Line data    Source code

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