Index: webrtc/modules/audio_mixer/default_output_rate_calculator.cc |
diff --git a/webrtc/modules/audio_mixer/default_output_rate_calculator.cc b/webrtc/modules/audio_mixer/default_output_rate_calculator.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..6d62aec32f56365316c9a40f8995c0a235ed9c77 |
--- /dev/null |
+++ b/webrtc/modules/audio_mixer/default_output_rate_calculator.cc |
@@ -0,0 +1,39 @@ |
+/* |
+ * 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 |