| /* |
| * 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 "webrtc/modules/audio_mixer/default_output_rate_calculator.h" |
| |
| #include <algorithm> |
| |
| #include "webrtc/modules/audio_processing/include/audio_processing.h" |
| |
| namespace webrtc { |
| |
| int DefaultOutputRateCalculator::CalculateOutputRate( |
| const std::vector<int>& preferred_sample_rates) { |
| if (preferred_sample_rates.empty()) { |
| return DefaultOutputRateCalculator::kDefaultFrequency; |
| } |
| using NativeRate = AudioProcessing::NativeRate; |
| const int maximal_frequency = *std::max_element( |
| preferred_sample_rates.begin(), preferred_sample_rates.end()); |
| |
| RTC_DCHECK_LE(NativeRate::kSampleRate8kHz, maximal_frequency); |
| RTC_DCHECK_GE(NativeRate::kSampleRate48kHz, maximal_frequency); |
| |
| static constexpr NativeRate native_rates[] = { |
| NativeRate::kSampleRate8kHz, NativeRate::kSampleRate16kHz, |
| NativeRate::kSampleRate32kHz, NativeRate::kSampleRate48kHz}; |
| const auto* rounded_up_index = std::lower_bound( |
| std::begin(native_rates), std::end(native_rates), maximal_frequency); |
| RTC_DCHECK(rounded_up_index != std::end(native_rates)); |
| return *rounded_up_index; |
| } |
| } // namespace webrtc |