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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_mixer/default_output_rate_calculator.h"
#include <algorithm>
#include <iterator>
#include "api/audio/audio_processing.h"
#include "rtc_base/checks.h"
namespace webrtc {
int DefaultOutputRateCalculator::CalculateOutputRateFromRange(
rtc::ArrayView<const 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.cbegin(), preferred_sample_rates.cend());
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