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| 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 "webrtc/modules/audio_mixer/default_output_rate_calculator.h" |
| 12 |
| 13 #include <algorithm> |
| 14 |
| 15 #include "webrtc/modules/audio_processing/include/audio_processing.h" |
| 16 |
| 17 namespace webrtc { |
| 18 |
| 19 int DefaultOutputRateCalculator::CalculateOutputRate( |
| 20 const std::vector<int>& preferred_sample_rates) { |
| 21 if (preferred_sample_rates.empty()) { |
| 22 return DefaultOutputRateCalculator::kDefaultFrequency; |
| 23 } |
| 24 using NativeRate = AudioProcessing::NativeRate; |
| 25 const int maximal_frequency = *std::max_element( |
| 26 preferred_sample_rates.begin(), preferred_sample_rates.end()); |
| 27 |
| 28 RTC_DCHECK_LE(NativeRate::kSampleRate8kHz, maximal_frequency); |
| 29 RTC_DCHECK_GE(NativeRate::kSampleRate48kHz, maximal_frequency); |
| 30 |
| 31 static constexpr NativeRate native_rates[] = { |
| 32 NativeRate::kSampleRate8kHz, NativeRate::kSampleRate16kHz, |
| 33 NativeRate::kSampleRate32kHz, NativeRate::kSampleRate48kHz}; |
| 34 const auto rounded_up_index = std::lower_bound( |
| 35 std::begin(native_rates), std::end(native_rates), maximal_frequency); |
| 36 RTC_DCHECK(rounded_up_index != std::end(native_rates)); |
| 37 return *rounded_up_index; |
| 38 } |
| 39 } // namespace webrtc |
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